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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * ROUTE - implementation of the IP router. | |
8 | * | |
02c30a84 | 9 | * Authors: Ross Biro |
1da177e4 LT |
10 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
11 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
12 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
13 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Verify area fixes. | |
17 | * Alan Cox : cli() protects routing changes | |
18 | * Rui Oliveira : ICMP routing table updates | |
19 | * (rco@di.uminho.pt) Routing table insertion and update | |
20 | * Linus Torvalds : Rewrote bits to be sensible | |
21 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 22 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
23 | * Alan Cox : MTU in route table |
24 | * Alan Cox : MSS actually. Also added the window | |
25 | * clamper. | |
26 | * Sam Lantinga : Fixed route matching in rt_del() | |
27 | * Alan Cox : Routing cache support. | |
28 | * Alan Cox : Removed compatibility cruft. | |
29 | * Alan Cox : RTF_REJECT support. | |
30 | * Alan Cox : TCP irtt support. | |
31 | * Jonathan Naylor : Added Metric support. | |
32 | * Miquel van Smoorenburg : BSD API fixes. | |
33 | * Miquel van Smoorenburg : Metrics. | |
34 | * Alan Cox : Use __u32 properly | |
35 | * Alan Cox : Aligned routing errors more closely with BSD | |
36 | * our system is still very different. | |
37 | * Alan Cox : Faster /proc handling | |
38 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
39 | * routing caches and better behaviour. | |
e905a9ed | 40 | * |
1da177e4 LT |
41 | * Olaf Erb : irtt wasn't being copied right. |
42 | * Bjorn Ekwall : Kerneld route support. | |
43 | * Alan Cox : Multicast fixed (I hope) | |
44 | * Pavel Krauz : Limited broadcast fixed | |
45 | * Mike McLagan : Routing by source | |
46 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
47 | * route.c and rewritten from scratch. | |
48 | * Andi Kleen : Load-limit warning messages. | |
49 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
50 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
51 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
52 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
53 | * Marc Boucher : routing by fwmark | |
54 | * Robert Olsson : Added rt_cache statistics | |
55 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 56 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
57 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
58 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
59 | */ |
60 | ||
afd46503 JP |
61 | #define pr_fmt(fmt) "IPv4: " fmt |
62 | ||
1da177e4 | 63 | #include <linux/module.h> |
7c0f6ba6 | 64 | #include <linux/uaccess.h> |
1da177e4 LT |
65 | #include <linux/bitops.h> |
66 | #include <linux/types.h> | |
67 | #include <linux/kernel.h> | |
1da177e4 LT |
68 | #include <linux/mm.h> |
69 | #include <linux/string.h> | |
70 | #include <linux/socket.h> | |
71 | #include <linux/sockios.h> | |
72 | #include <linux/errno.h> | |
73 | #include <linux/in.h> | |
74 | #include <linux/inet.h> | |
75 | #include <linux/netdevice.h> | |
76 | #include <linux/proc_fs.h> | |
77 | #include <linux/init.h> | |
78 | #include <linux/skbuff.h> | |
1da177e4 LT |
79 | #include <linux/inetdevice.h> |
80 | #include <linux/igmp.h> | |
81 | #include <linux/pkt_sched.h> | |
82 | #include <linux/mroute.h> | |
83 | #include <linux/netfilter_ipv4.h> | |
84 | #include <linux/random.h> | |
1da177e4 LT |
85 | #include <linux/rcupdate.h> |
86 | #include <linux/times.h> | |
5a0e3ad6 | 87 | #include <linux/slab.h> |
73f156a6 | 88 | #include <linux/jhash.h> |
352e512c | 89 | #include <net/dst.h> |
1b7179d3 | 90 | #include <net/dst_metadata.h> |
457c4cbc | 91 | #include <net/net_namespace.h> |
1da177e4 LT |
92 | #include <net/protocol.h> |
93 | #include <net/ip.h> | |
94 | #include <net/route.h> | |
95 | #include <net/inetpeer.h> | |
96 | #include <net/sock.h> | |
97 | #include <net/ip_fib.h> | |
5481d73f | 98 | #include <net/nexthop.h> |
1da177e4 LT |
99 | #include <net/arp.h> |
100 | #include <net/tcp.h> | |
101 | #include <net/icmp.h> | |
102 | #include <net/xfrm.h> | |
571e7226 | 103 | #include <net/lwtunnel.h> |
8d71740c | 104 | #include <net/netevent.h> |
63f3444f | 105 | #include <net/rtnetlink.h> |
1da177e4 LT |
106 | #ifdef CONFIG_SYSCTL |
107 | #include <linux/sysctl.h> | |
108 | #endif | |
6e5714ea | 109 | #include <net/secure_seq.h> |
1b7179d3 | 110 | #include <net/ip_tunnels.h> |
385add90 | 111 | #include <net/l3mdev.h> |
1da177e4 | 112 | |
b6179813 RP |
113 | #include "fib_lookup.h" |
114 | ||
68a5e3dd | 115 | #define RT_FL_TOS(oldflp4) \ |
f61759e6 | 116 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
1da177e4 | 117 | |
1da177e4 LT |
118 | #define RT_GC_TIMEOUT (300*HZ) |
119 | ||
1da177e4 | 120 | static int ip_rt_max_size; |
817bc4db SH |
121 | static int ip_rt_redirect_number __read_mostly = 9; |
122 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
123 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
124 | static int ip_rt_error_cost __read_mostly = HZ; | |
125 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
817bc4db | 126 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; |
c7272c2f | 127 | static u32 ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; |
817bc4db | 128 | static int ip_rt_min_advmss __read_mostly = 256; |
9f28a2fc | 129 | |
deed49df | 130 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
c7272c2f | 131 | |
1da177e4 LT |
132 | /* |
133 | * Interface to generic destination cache. | |
134 | */ | |
135 | ||
136 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 137 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 138 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
1da177e4 LT |
139 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
140 | static void ipv4_link_failure(struct sk_buff *skb); | |
6700c270 DM |
141 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
142 | struct sk_buff *skb, u32 mtu); | |
143 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, | |
144 | struct sk_buff *skb); | |
caacf05e | 145 | static void ipv4_dst_destroy(struct dst_entry *dst); |
1da177e4 | 146 | |
62fa8a84 DM |
147 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
148 | { | |
31248731 DM |
149 | WARN_ON(1); |
150 | return NULL; | |
62fa8a84 DM |
151 | } |
152 | ||
f894cbf8 DM |
153 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
154 | struct sk_buff *skb, | |
155 | const void *daddr); | |
63fca65d | 156 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr); |
d3aaeb38 | 157 | |
1da177e4 LT |
158 | static struct dst_ops ipv4_dst_ops = { |
159 | .family = AF_INET, | |
1da177e4 | 160 | .check = ipv4_dst_check, |
0dbaee3b | 161 | .default_advmss = ipv4_default_advmss, |
ebb762f2 | 162 | .mtu = ipv4_mtu, |
62fa8a84 | 163 | .cow_metrics = ipv4_cow_metrics, |
caacf05e | 164 | .destroy = ipv4_dst_destroy, |
1da177e4 LT |
165 | .negative_advice = ipv4_negative_advice, |
166 | .link_failure = ipv4_link_failure, | |
167 | .update_pmtu = ip_rt_update_pmtu, | |
e47a185b | 168 | .redirect = ip_do_redirect, |
b92dacd4 | 169 | .local_out = __ip_local_out, |
d3aaeb38 | 170 | .neigh_lookup = ipv4_neigh_lookup, |
63fca65d | 171 | .confirm_neigh = ipv4_confirm_neigh, |
1da177e4 LT |
172 | }; |
173 | ||
174 | #define ECN_OR_COST(class) TC_PRIO_##class | |
175 | ||
4839c52b | 176 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 177 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 178 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
179 | TC_PRIO_BESTEFFORT, |
180 | ECN_OR_COST(BESTEFFORT), | |
181 | TC_PRIO_BULK, | |
182 | ECN_OR_COST(BULK), | |
183 | TC_PRIO_BULK, | |
184 | ECN_OR_COST(BULK), | |
185 | TC_PRIO_INTERACTIVE, | |
186 | ECN_OR_COST(INTERACTIVE), | |
187 | TC_PRIO_INTERACTIVE, | |
188 | ECN_OR_COST(INTERACTIVE), | |
189 | TC_PRIO_INTERACTIVE_BULK, | |
190 | ECN_OR_COST(INTERACTIVE_BULK), | |
191 | TC_PRIO_INTERACTIVE_BULK, | |
192 | ECN_OR_COST(INTERACTIVE_BULK) | |
193 | }; | |
d4a96865 | 194 | EXPORT_SYMBOL(ip_tos2prio); |
1da177e4 | 195 | |
2f970d83 | 196 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
3ed66e91 | 197 | #define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field) |
1da177e4 | 198 | |
1da177e4 | 199 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
200 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
201 | { | |
29e75252 | 202 | if (*pos) |
89aef892 | 203 | return NULL; |
29e75252 | 204 | return SEQ_START_TOKEN; |
1da177e4 LT |
205 | } |
206 | ||
207 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
208 | { | |
1da177e4 | 209 | ++*pos; |
89aef892 | 210 | return NULL; |
1da177e4 LT |
211 | } |
212 | ||
213 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
214 | { | |
1da177e4 LT |
215 | } |
216 | ||
217 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
218 | { | |
219 | if (v == SEQ_START_TOKEN) | |
220 | seq_printf(seq, "%-127s\n", | |
221 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
222 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
223 | "HHUptod\tSpecDst"); | |
e905a9ed | 224 | return 0; |
1da177e4 LT |
225 | } |
226 | ||
f690808e | 227 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
228 | .start = rt_cache_seq_start, |
229 | .next = rt_cache_seq_next, | |
230 | .stop = rt_cache_seq_stop, | |
231 | .show = rt_cache_seq_show, | |
232 | }; | |
233 | ||
234 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
235 | { | |
89aef892 | 236 | return seq_open(file, &rt_cache_seq_ops); |
1da177e4 LT |
237 | } |
238 | ||
9a32144e | 239 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
240 | .open = rt_cache_seq_open, |
241 | .read = seq_read, | |
242 | .llseek = seq_lseek, | |
89aef892 | 243 | .release = seq_release, |
1da177e4 LT |
244 | }; |
245 | ||
246 | ||
247 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
248 | { | |
249 | int cpu; | |
250 | ||
251 | if (*pos == 0) | |
252 | return SEQ_START_TOKEN; | |
253 | ||
0f23174a | 254 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
255 | if (!cpu_possible(cpu)) |
256 | continue; | |
257 | *pos = cpu+1; | |
2f970d83 | 258 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
259 | } |
260 | return NULL; | |
261 | } | |
262 | ||
263 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
264 | { | |
265 | int cpu; | |
266 | ||
0f23174a | 267 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
268 | if (!cpu_possible(cpu)) |
269 | continue; | |
270 | *pos = cpu+1; | |
2f970d83 | 271 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
272 | } |
273 | return NULL; | |
e905a9ed | 274 | |
1da177e4 LT |
275 | } |
276 | ||
277 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
278 | { | |
279 | ||
280 | } | |
281 | ||
282 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
283 | { | |
284 | struct rt_cache_stat *st = v; | |
285 | ||
286 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 287 | seq_printf(seq, "entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"); |
1da177e4 LT |
288 | return 0; |
289 | } | |
e905a9ed | 290 | |
1da177e4 LT |
291 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
292 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
fc66f95c | 293 | dst_entries_get_slow(&ipv4_dst_ops), |
0baf2b35 | 294 | 0, /* st->in_hit */ |
1da177e4 LT |
295 | st->in_slow_tot, |
296 | st->in_slow_mc, | |
297 | st->in_no_route, | |
298 | st->in_brd, | |
299 | st->in_martian_dst, | |
300 | st->in_martian_src, | |
301 | ||
0baf2b35 | 302 | 0, /* st->out_hit */ |
1da177e4 | 303 | st->out_slow_tot, |
e905a9ed | 304 | st->out_slow_mc, |
1da177e4 | 305 | |
0baf2b35 ED |
306 | 0, /* st->gc_total */ |
307 | 0, /* st->gc_ignored */ | |
308 | 0, /* st->gc_goal_miss */ | |
309 | 0, /* st->gc_dst_overflow */ | |
310 | 0, /* st->in_hlist_search */ | |
311 | 0 /* st->out_hlist_search */ | |
1da177e4 LT |
312 | ); |
313 | return 0; | |
314 | } | |
315 | ||
f690808e | 316 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
317 | .start = rt_cpu_seq_start, |
318 | .next = rt_cpu_seq_next, | |
319 | .stop = rt_cpu_seq_stop, | |
320 | .show = rt_cpu_seq_show, | |
321 | }; | |
322 | ||
323 | ||
324 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
325 | { | |
326 | return seq_open(file, &rt_cpu_seq_ops); | |
327 | } | |
328 | ||
9a32144e | 329 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
330 | .open = rt_cpu_seq_open, |
331 | .read = seq_read, | |
332 | .llseek = seq_lseek, | |
333 | .release = seq_release, | |
334 | }; | |
335 | ||
c7066f70 | 336 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 337 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
78c686e9 | 338 | { |
a661c419 AD |
339 | struct ip_rt_acct *dst, *src; |
340 | unsigned int i, j; | |
341 | ||
342 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); | |
343 | if (!dst) | |
344 | return -ENOMEM; | |
345 | ||
346 | for_each_possible_cpu(i) { | |
347 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); | |
348 | for (j = 0; j < 256; j++) { | |
349 | dst[j].o_bytes += src[j].o_bytes; | |
350 | dst[j].o_packets += src[j].o_packets; | |
351 | dst[j].i_bytes += src[j].i_bytes; | |
352 | dst[j].i_packets += src[j].i_packets; | |
353 | } | |
78c686e9 PE |
354 | } |
355 | ||
a661c419 AD |
356 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
357 | kfree(dst); | |
358 | return 0; | |
359 | } | |
78c686e9 | 360 | #endif |
107f1634 | 361 | |
73b38711 | 362 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
363 | { |
364 | struct proc_dir_entry *pde; | |
365 | ||
d6444062 | 366 | pde = proc_create("rt_cache", 0444, net->proc_net, |
d4beaa66 | 367 | &rt_cache_seq_fops); |
107f1634 PE |
368 | if (!pde) |
369 | goto err1; | |
370 | ||
d6444062 | 371 | pde = proc_create("rt_cache", 0444, |
77020720 | 372 | net->proc_net_stat, &rt_cpu_seq_fops); |
107f1634 PE |
373 | if (!pde) |
374 | goto err2; | |
375 | ||
c7066f70 | 376 | #ifdef CONFIG_IP_ROUTE_CLASSID |
3f3942ac CH |
377 | pde = proc_create_single("rt_acct", 0, net->proc_net, |
378 | rt_acct_proc_show); | |
107f1634 PE |
379 | if (!pde) |
380 | goto err3; | |
381 | #endif | |
382 | return 0; | |
383 | ||
c7066f70 | 384 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
385 | err3: |
386 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
387 | #endif | |
388 | err2: | |
389 | remove_proc_entry("rt_cache", net->proc_net); | |
390 | err1: | |
391 | return -ENOMEM; | |
392 | } | |
73b38711 DL |
393 | |
394 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
395 | { | |
396 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
397 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 398 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 399 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 400 | #endif |
73b38711 DL |
401 | } |
402 | ||
403 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
404 | .init = ip_rt_do_proc_init, | |
405 | .exit = ip_rt_do_proc_exit, | |
406 | }; | |
407 | ||
408 | static int __init ip_rt_proc_init(void) | |
409 | { | |
410 | return register_pernet_subsys(&ip_rt_proc_ops); | |
411 | } | |
412 | ||
107f1634 | 413 | #else |
73b38711 | 414 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
415 | { |
416 | return 0; | |
417 | } | |
1da177e4 | 418 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 419 | |
4331debc | 420 | static inline bool rt_is_expired(const struct rtable *rth) |
e84f84f2 | 421 | { |
ca4c3fc2 | 422 | return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)); |
e84f84f2 DL |
423 | } |
424 | ||
4ccfe6d4 | 425 | void rt_cache_flush(struct net *net) |
1da177e4 | 426 | { |
ca4c3fc2 | 427 | rt_genid_bump_ipv4(net); |
98376387 ED |
428 | } |
429 | ||
f894cbf8 DM |
430 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
431 | struct sk_buff *skb, | |
432 | const void *daddr) | |
3769cffb | 433 | { |
1550c171 | 434 | const struct rtable *rt = container_of(dst, struct rtable, dst); |
d3aaeb38 | 435 | struct net_device *dev = dst->dev; |
3769cffb DM |
436 | struct neighbour *n; |
437 | ||
5c9f7c1d DA |
438 | rcu_read_lock_bh(); |
439 | ||
440 | if (likely(rt->rt_gw_family == AF_INET)) { | |
441 | n = ip_neigh_gw4(dev, rt->rt_gw4); | |
442 | } else if (rt->rt_gw_family == AF_INET6) { | |
443 | n = ip_neigh_gw6(dev, &rt->rt_gw6); | |
444 | } else { | |
445 | __be32 pkey; | |
446 | ||
447 | pkey = skb ? ip_hdr(skb)->daddr : *((__be32 *) daddr); | |
448 | n = ip_neigh_gw4(dev, pkey); | |
449 | } | |
450 | ||
537de0c8 | 451 | if (!IS_ERR(n) && !refcount_inc_not_zero(&n->refcnt)) |
5c9f7c1d DA |
452 | n = NULL; |
453 | ||
454 | rcu_read_unlock_bh(); | |
455 | ||
456 | return n; | |
d3aaeb38 DM |
457 | } |
458 | ||
63fca65d JA |
459 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
460 | { | |
1550c171 | 461 | const struct rtable *rt = container_of(dst, struct rtable, dst); |
63fca65d JA |
462 | struct net_device *dev = dst->dev; |
463 | const __be32 *pkey = daddr; | |
63fca65d | 464 | |
6de9c055 | 465 | if (rt->rt_gw_family == AF_INET) { |
1550c171 | 466 | pkey = (const __be32 *)&rt->rt_gw4; |
6de9c055 DA |
467 | } else if (rt->rt_gw_family == AF_INET6) { |
468 | return __ipv6_confirm_neigh_stub(dev, &rt->rt_gw6); | |
469 | } else if (!daddr || | |
63fca65d | 470 | (rt->rt_flags & |
6de9c055 | 471 | (RTCF_MULTICAST | RTCF_BROADCAST | RTCF_LOCAL))) { |
63fca65d | 472 | return; |
6de9c055 | 473 | } |
63fca65d JA |
474 | __ipv4_confirm_neigh(dev, *(__force u32 *)pkey); |
475 | } | |
476 | ||
04ca6973 | 477 | #define IP_IDENTS_SZ 2048u |
04ca6973 | 478 | |
355b590c ED |
479 | static atomic_t *ip_idents __read_mostly; |
480 | static u32 *ip_tstamps __read_mostly; | |
04ca6973 ED |
481 | |
482 | /* In order to protect privacy, we add a perturbation to identifiers | |
483 | * if one generator is seldom used. This makes hard for an attacker | |
484 | * to infer how many packets were sent between two points in time. | |
485 | */ | |
486 | u32 ip_idents_reserve(u32 hash, int segs) | |
487 | { | |
355b590c ED |
488 | u32 *p_tstamp = ip_tstamps + hash % IP_IDENTS_SZ; |
489 | atomic_t *p_id = ip_idents + hash % IP_IDENTS_SZ; | |
6aa7de05 | 490 | u32 old = READ_ONCE(*p_tstamp); |
04ca6973 | 491 | u32 now = (u32)jiffies; |
adb03115 | 492 | u32 new, delta = 0; |
04ca6973 | 493 | |
355b590c | 494 | if (old != now && cmpxchg(p_tstamp, old, now) == old) |
04ca6973 ED |
495 | delta = prandom_u32_max(now - old); |
496 | ||
adb03115 ED |
497 | /* Do not use atomic_add_return() as it makes UBSAN unhappy */ |
498 | do { | |
499 | old = (u32)atomic_read(p_id); | |
500 | new = old + delta + segs; | |
501 | } while (atomic_cmpxchg(p_id, old, new) != old); | |
502 | ||
503 | return new - segs; | |
04ca6973 ED |
504 | } |
505 | EXPORT_SYMBOL(ip_idents_reserve); | |
1da177e4 | 506 | |
b6a7719a | 507 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs) |
1da177e4 | 508 | { |
73f156a6 | 509 | u32 hash, id; |
1da177e4 | 510 | |
df453700 ED |
511 | /* Note the following code is not safe, but this is okay. */ |
512 | if (unlikely(siphash_key_is_zero(&net->ipv4.ip_id_key))) | |
513 | get_random_bytes(&net->ipv4.ip_id_key, | |
514 | sizeof(net->ipv4.ip_id_key)); | |
1da177e4 | 515 | |
df453700 | 516 | hash = siphash_3u32((__force u32)iph->daddr, |
04ca6973 | 517 | (__force u32)iph->saddr, |
df453700 ED |
518 | iph->protocol, |
519 | &net->ipv4.ip_id_key); | |
73f156a6 ED |
520 | id = ip_idents_reserve(hash, segs); |
521 | iph->id = htons(id); | |
1da177e4 | 522 | } |
4bc2f18b | 523 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 | 524 | |
e2d118a1 LC |
525 | static void __build_flow_key(const struct net *net, struct flowi4 *fl4, |
526 | const struct sock *sk, | |
4895c771 DM |
527 | const struct iphdr *iph, |
528 | int oif, u8 tos, | |
529 | u8 prot, u32 mark, int flow_flags) | |
530 | { | |
531 | if (sk) { | |
532 | const struct inet_sock *inet = inet_sk(sk); | |
533 | ||
534 | oif = sk->sk_bound_dev_if; | |
535 | mark = sk->sk_mark; | |
536 | tos = RT_CONN_FLAGS(sk); | |
537 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; | |
538 | } | |
539 | flowi4_init_output(fl4, oif, mark, tos, | |
540 | RT_SCOPE_UNIVERSE, prot, | |
541 | flow_flags, | |
e2d118a1 LC |
542 | iph->daddr, iph->saddr, 0, 0, |
543 | sock_net_uid(net, sk)); | |
4895c771 DM |
544 | } |
545 | ||
5abf7f7e ED |
546 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
547 | const struct sock *sk) | |
4895c771 | 548 | { |
d109e61b | 549 | const struct net *net = dev_net(skb->dev); |
4895c771 DM |
550 | const struct iphdr *iph = ip_hdr(skb); |
551 | int oif = skb->dev->ifindex; | |
552 | u8 tos = RT_TOS(iph->tos); | |
553 | u8 prot = iph->protocol; | |
554 | u32 mark = skb->mark; | |
555 | ||
d109e61b | 556 | __build_flow_key(net, fl4, sk, iph, oif, tos, prot, mark, 0); |
4895c771 DM |
557 | } |
558 | ||
5abf7f7e | 559 | static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk) |
4895c771 DM |
560 | { |
561 | const struct inet_sock *inet = inet_sk(sk); | |
5abf7f7e | 562 | const struct ip_options_rcu *inet_opt; |
4895c771 DM |
563 | __be32 daddr = inet->inet_daddr; |
564 | ||
565 | rcu_read_lock(); | |
566 | inet_opt = rcu_dereference(inet->inet_opt); | |
567 | if (inet_opt && inet_opt->opt.srr) | |
568 | daddr = inet_opt->opt.faddr; | |
569 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, | |
570 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, | |
571 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, | |
572 | inet_sk_flowi_flags(sk), | |
e2d118a1 | 573 | daddr, inet->inet_saddr, 0, 0, sk->sk_uid); |
4895c771 DM |
574 | rcu_read_unlock(); |
575 | } | |
576 | ||
5abf7f7e ED |
577 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
578 | const struct sk_buff *skb) | |
4895c771 DM |
579 | { |
580 | if (skb) | |
581 | build_skb_flow_key(fl4, skb, sk); | |
582 | else | |
583 | build_sk_flow_key(fl4, sk); | |
584 | } | |
585 | ||
c5038a83 | 586 | static DEFINE_SPINLOCK(fnhe_lock); |
4895c771 | 587 | |
2ffae99d TT |
588 | static void fnhe_flush_routes(struct fib_nh_exception *fnhe) |
589 | { | |
590 | struct rtable *rt; | |
591 | ||
592 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
593 | if (rt) { | |
594 | RCU_INIT_POINTER(fnhe->fnhe_rth_input, NULL); | |
95c47f9c | 595 | dst_dev_put(&rt->dst); |
0830106c | 596 | dst_release(&rt->dst); |
2ffae99d TT |
597 | } |
598 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
599 | if (rt) { | |
600 | RCU_INIT_POINTER(fnhe->fnhe_rth_output, NULL); | |
95c47f9c | 601 | dst_dev_put(&rt->dst); |
0830106c | 602 | dst_release(&rt->dst); |
2ffae99d TT |
603 | } |
604 | } | |
605 | ||
aee06da6 | 606 | static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) |
4895c771 DM |
607 | { |
608 | struct fib_nh_exception *fnhe, *oldest; | |
609 | ||
610 | oldest = rcu_dereference(hash->chain); | |
611 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; | |
612 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
613 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) | |
614 | oldest = fnhe; | |
615 | } | |
2ffae99d | 616 | fnhe_flush_routes(oldest); |
4895c771 DM |
617 | return oldest; |
618 | } | |
619 | ||
d3a25c98 DM |
620 | static inline u32 fnhe_hashfun(__be32 daddr) |
621 | { | |
d546c621 | 622 | static u32 fnhe_hashrnd __read_mostly; |
d3a25c98 DM |
623 | u32 hval; |
624 | ||
d546c621 ED |
625 | net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd)); |
626 | hval = jhash_1word((__force u32) daddr, fnhe_hashrnd); | |
627 | return hash_32(hval, FNHE_HASH_SHIFT); | |
d3a25c98 DM |
628 | } |
629 | ||
387aa65a TT |
630 | static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |
631 | { | |
632 | rt->rt_pmtu = fnhe->fnhe_pmtu; | |
d52e5a7e | 633 | rt->rt_mtu_locked = fnhe->fnhe_mtu_locked; |
387aa65a TT |
634 | rt->dst.expires = fnhe->fnhe_expires; |
635 | ||
636 | if (fnhe->fnhe_gw) { | |
637 | rt->rt_flags |= RTCF_REDIRECTED; | |
1550c171 DA |
638 | rt->rt_gw_family = AF_INET; |
639 | rt->rt_gw4 = fnhe->fnhe_gw; | |
387aa65a TT |
640 | } |
641 | } | |
642 | ||
a5995e71 DA |
643 | static void update_or_create_fnhe(struct fib_nh_common *nhc, __be32 daddr, |
644 | __be32 gw, u32 pmtu, bool lock, | |
645 | unsigned long expires) | |
4895c771 | 646 | { |
aee06da6 | 647 | struct fnhe_hash_bucket *hash; |
4895c771 | 648 | struct fib_nh_exception *fnhe; |
387aa65a | 649 | struct rtable *rt; |
cebe84c6 | 650 | u32 genid, hval; |
387aa65a | 651 | unsigned int i; |
4895c771 | 652 | int depth; |
cebe84c6 | 653 | |
a5995e71 | 654 | genid = fnhe_genid(dev_net(nhc->nhc_dev)); |
cebe84c6 | 655 | hval = fnhe_hashfun(daddr); |
aee06da6 | 656 | |
c5038a83 | 657 | spin_lock_bh(&fnhe_lock); |
4895c771 | 658 | |
a5995e71 | 659 | hash = rcu_dereference(nhc->nhc_exceptions); |
4895c771 | 660 | if (!hash) { |
6396bb22 | 661 | hash = kcalloc(FNHE_HASH_SIZE, sizeof(*hash), GFP_ATOMIC); |
4895c771 | 662 | if (!hash) |
aee06da6 | 663 | goto out_unlock; |
a5995e71 | 664 | rcu_assign_pointer(nhc->nhc_exceptions, hash); |
4895c771 DM |
665 | } |
666 | ||
4895c771 DM |
667 | hash += hval; |
668 | ||
669 | depth = 0; | |
670 | for (fnhe = rcu_dereference(hash->chain); fnhe; | |
671 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
672 | if (fnhe->fnhe_daddr == daddr) | |
aee06da6 | 673 | break; |
4895c771 DM |
674 | depth++; |
675 | } | |
676 | ||
aee06da6 | 677 | if (fnhe) { |
cebe84c6 XL |
678 | if (fnhe->fnhe_genid != genid) |
679 | fnhe->fnhe_genid = genid; | |
aee06da6 JA |
680 | if (gw) |
681 | fnhe->fnhe_gw = gw; | |
d52e5a7e | 682 | if (pmtu) { |
aee06da6 | 683 | fnhe->fnhe_pmtu = pmtu; |
d52e5a7e SD |
684 | fnhe->fnhe_mtu_locked = lock; |
685 | } | |
e39d5246 | 686 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a | 687 | /* Update all cached dsts too */ |
2ffae99d TT |
688 | rt = rcu_dereference(fnhe->fnhe_rth_input); |
689 | if (rt) | |
690 | fill_route_from_fnhe(rt, fnhe); | |
691 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
387aa65a TT |
692 | if (rt) |
693 | fill_route_from_fnhe(rt, fnhe); | |
aee06da6 JA |
694 | } else { |
695 | if (depth > FNHE_RECLAIM_DEPTH) | |
696 | fnhe = fnhe_oldest(hash); | |
697 | else { | |
698 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); | |
699 | if (!fnhe) | |
700 | goto out_unlock; | |
701 | ||
702 | fnhe->fnhe_next = hash->chain; | |
703 | rcu_assign_pointer(hash->chain, fnhe); | |
704 | } | |
cebe84c6 | 705 | fnhe->fnhe_genid = genid; |
aee06da6 JA |
706 | fnhe->fnhe_daddr = daddr; |
707 | fnhe->fnhe_gw = gw; | |
708 | fnhe->fnhe_pmtu = pmtu; | |
d52e5a7e | 709 | fnhe->fnhe_mtu_locked = lock; |
94720e3a | 710 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a TT |
711 | |
712 | /* Exception created; mark the cached routes for the nexthop | |
713 | * stale, so anyone caching it rechecks if this exception | |
714 | * applies to them. | |
715 | */ | |
0f457a36 | 716 | rt = rcu_dereference(nhc->nhc_rth_input); |
2ffae99d TT |
717 | if (rt) |
718 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
719 | ||
387aa65a TT |
720 | for_each_possible_cpu(i) { |
721 | struct rtable __rcu **prt; | |
0f457a36 | 722 | prt = per_cpu_ptr(nhc->nhc_pcpu_rth_output, i); |
387aa65a TT |
723 | rt = rcu_dereference(*prt); |
724 | if (rt) | |
725 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
726 | } | |
4895c771 | 727 | } |
4895c771 | 728 | |
4895c771 | 729 | fnhe->fnhe_stamp = jiffies; |
aee06da6 JA |
730 | |
731 | out_unlock: | |
c5038a83 | 732 | spin_unlock_bh(&fnhe_lock); |
4895c771 DM |
733 | } |
734 | ||
ceb33206 DM |
735 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
736 | bool kill_route) | |
1da177e4 | 737 | { |
e47a185b | 738 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
94206125 | 739 | __be32 old_gw = ip_hdr(skb)->saddr; |
e47a185b | 740 | struct net_device *dev = skb->dev; |
e47a185b | 741 | struct in_device *in_dev; |
4895c771 | 742 | struct fib_result res; |
e47a185b | 743 | struct neighbour *n; |
317805b8 | 744 | struct net *net; |
1da177e4 | 745 | |
94206125 DM |
746 | switch (icmp_hdr(skb)->code & 7) { |
747 | case ICMP_REDIR_NET: | |
748 | case ICMP_REDIR_NETTOS: | |
749 | case ICMP_REDIR_HOST: | |
750 | case ICMP_REDIR_HOSTTOS: | |
751 | break; | |
752 | ||
753 | default: | |
754 | return; | |
755 | } | |
756 | ||
1550c171 | 757 | if (rt->rt_gw_family != AF_INET || rt->rt_gw4 != old_gw) |
e47a185b DM |
758 | return; |
759 | ||
760 | in_dev = __in_dev_get_rcu(dev); | |
761 | if (!in_dev) | |
762 | return; | |
763 | ||
c346dca1 | 764 | net = dev_net(dev); |
9d4fb27d JP |
765 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
766 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
767 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
768 | goto reject_redirect; |
769 | ||
770 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
771 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
772 | goto reject_redirect; | |
773 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
774 | goto reject_redirect; | |
775 | } else { | |
317805b8 | 776 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
777 | goto reject_redirect; |
778 | } | |
779 | ||
969447f2 SSL |
780 | n = __ipv4_neigh_lookup(rt->dst.dev, new_gw); |
781 | if (!n) | |
782 | n = neigh_create(&arp_tbl, &new_gw, rt->dst.dev); | |
2c1a4311 | 783 | if (!IS_ERR(n)) { |
e47a185b DM |
784 | if (!(n->nud_state & NUD_VALID)) { |
785 | neigh_event_send(n, NULL); | |
786 | } else { | |
0eeb075f | 787 | if (fib_lookup(net, fl4, &res, 0) == 0) { |
eba618ab | 788 | struct fib_nh_common *nhc = FIB_RES_NHC(res); |
4895c771 | 789 | |
a5995e71 | 790 | update_or_create_fnhe(nhc, fl4->daddr, new_gw, |
d52e5a7e SD |
791 | 0, false, |
792 | jiffies + ip_rt_gc_timeout); | |
4895c771 | 793 | } |
ceb33206 DM |
794 | if (kill_route) |
795 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
e47a185b DM |
796 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
797 | } | |
798 | neigh_release(n); | |
799 | } | |
800 | return; | |
801 | ||
802 | reject_redirect: | |
803 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
99ee038d DM |
804 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
805 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
806 | __be32 daddr = iph->daddr; | |
807 | __be32 saddr = iph->saddr; | |
808 | ||
e47a185b DM |
809 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
810 | " Advised path = %pI4 -> %pI4\n", | |
811 | &old_gw, dev->name, &new_gw, | |
812 | &saddr, &daddr); | |
99ee038d | 813 | } |
e47a185b DM |
814 | #endif |
815 | ; | |
816 | } | |
817 | ||
4895c771 DM |
818 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
819 | { | |
820 | struct rtable *rt; | |
821 | struct flowi4 fl4; | |
f96ef988 | 822 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
7d995694 | 823 | struct net *net = dev_net(skb->dev); |
f96ef988 MK |
824 | int oif = skb->dev->ifindex; |
825 | u8 tos = RT_TOS(iph->tos); | |
826 | u8 prot = iph->protocol; | |
827 | u32 mark = skb->mark; | |
4895c771 DM |
828 | |
829 | rt = (struct rtable *) dst; | |
830 | ||
7d995694 | 831 | __build_flow_key(net, &fl4, sk, iph, oif, tos, prot, mark, 0); |
ceb33206 | 832 | __ip_do_redirect(rt, skb, &fl4, true); |
4895c771 DM |
833 | } |
834 | ||
1da177e4 LT |
835 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
836 | { | |
ee6b9673 | 837 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
838 | struct dst_entry *ret = dst; |
839 | ||
840 | if (rt) { | |
d11a4dc1 | 841 | if (dst->obsolete > 0) { |
1da177e4 LT |
842 | ip_rt_put(rt); |
843 | ret = NULL; | |
5943634f DM |
844 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
845 | rt->dst.expires) { | |
89aef892 | 846 | ip_rt_put(rt); |
1da177e4 LT |
847 | ret = NULL; |
848 | } | |
849 | } | |
850 | return ret; | |
851 | } | |
852 | ||
853 | /* | |
854 | * Algorithm: | |
855 | * 1. The first ip_rt_redirect_number redirects are sent | |
856 | * with exponential backoff, then we stop sending them at all, | |
857 | * assuming that the host ignores our redirects. | |
858 | * 2. If we did not see packets requiring redirects | |
859 | * during ip_rt_redirect_silence, we assume that the host | |
860 | * forgot redirected route and start to send redirects again. | |
861 | * | |
862 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
863 | * in icmp.c. | |
864 | * | |
865 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
866 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
867 | */ | |
868 | ||
869 | void ip_rt_send_redirect(struct sk_buff *skb) | |
870 | { | |
511c3f92 | 871 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 872 | struct in_device *in_dev; |
92d86829 | 873 | struct inet_peer *peer; |
1d861aa4 | 874 | struct net *net; |
30038fc6 | 875 | int log_martians; |
192132b9 | 876 | int vif; |
1da177e4 | 877 | |
30038fc6 | 878 | rcu_read_lock(); |
d8d1f30b | 879 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
880 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
881 | rcu_read_unlock(); | |
1da177e4 | 882 | return; |
30038fc6 ED |
883 | } |
884 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
385add90 | 885 | vif = l3mdev_master_ifindex_rcu(rt->dst.dev); |
30038fc6 | 886 | rcu_read_unlock(); |
1da177e4 | 887 | |
1d861aa4 | 888 | net = dev_net(rt->dst.dev); |
192132b9 | 889 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, vif, 1); |
92d86829 | 890 | if (!peer) { |
e81da0e1 JA |
891 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, |
892 | rt_nexthop(rt, ip_hdr(skb)->daddr)); | |
92d86829 DM |
893 | return; |
894 | } | |
895 | ||
1da177e4 LT |
896 | /* No redirected packets during ip_rt_redirect_silence; |
897 | * reset the algorithm. | |
898 | */ | |
c09551c6 | 899 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) { |
92d86829 | 900 | peer->rate_tokens = 0; |
c09551c6 LB |
901 | peer->n_redirects = 0; |
902 | } | |
1da177e4 LT |
903 | |
904 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 905 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 906 | */ |
c09551c6 | 907 | if (peer->n_redirects >= ip_rt_redirect_number) { |
92d86829 | 908 | peer->rate_last = jiffies; |
1d861aa4 | 909 | goto out_put_peer; |
1da177e4 LT |
910 | } |
911 | ||
912 | /* Check for load limit; set rate_last to the latest sent | |
913 | * redirect. | |
914 | */ | |
92d86829 | 915 | if (peer->rate_tokens == 0 || |
14fb8a76 | 916 | time_after(jiffies, |
92d86829 DM |
917 | (peer->rate_last + |
918 | (ip_rt_redirect_load << peer->rate_tokens)))) { | |
e81da0e1 JA |
919 | __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr); |
920 | ||
921 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw); | |
92d86829 DM |
922 | peer->rate_last = jiffies; |
923 | ++peer->rate_tokens; | |
c09551c6 | 924 | ++peer->n_redirects; |
1da177e4 | 925 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
30038fc6 | 926 | if (log_martians && |
e87cc472 JP |
927 | peer->rate_tokens == ip_rt_redirect_number) |
928 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", | |
92101b3b | 929 | &ip_hdr(skb)->saddr, inet_iif(skb), |
e81da0e1 | 930 | &ip_hdr(skb)->daddr, &gw); |
1da177e4 LT |
931 | #endif |
932 | } | |
1d861aa4 DM |
933 | out_put_peer: |
934 | inet_putpeer(peer); | |
1da177e4 LT |
935 | } |
936 | ||
937 | static int ip_error(struct sk_buff *skb) | |
938 | { | |
511c3f92 | 939 | struct rtable *rt = skb_rtable(skb); |
e2c0dc1f SS |
940 | struct net_device *dev = skb->dev; |
941 | struct in_device *in_dev; | |
92d86829 | 942 | struct inet_peer *peer; |
1da177e4 | 943 | unsigned long now; |
251da413 | 944 | struct net *net; |
92d86829 | 945 | bool send; |
1da177e4 LT |
946 | int code; |
947 | ||
e2c0dc1f SS |
948 | if (netif_is_l3_master(skb->dev)) { |
949 | dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); | |
950 | if (!dev) | |
951 | goto out; | |
952 | } | |
953 | ||
954 | in_dev = __in_dev_get_rcu(dev); | |
955 | ||
381c759d EB |
956 | /* IP on this device is disabled. */ |
957 | if (!in_dev) | |
958 | goto out; | |
959 | ||
251da413 DM |
960 | net = dev_net(rt->dst.dev); |
961 | if (!IN_DEV_FORWARD(in_dev)) { | |
962 | switch (rt->dst.error) { | |
963 | case EHOSTUNREACH: | |
b45386ef | 964 | __IP_INC_STATS(net, IPSTATS_MIB_INADDRERRORS); |
251da413 DM |
965 | break; |
966 | ||
967 | case ENETUNREACH: | |
b45386ef | 968 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
251da413 DM |
969 | break; |
970 | } | |
971 | goto out; | |
972 | } | |
973 | ||
d8d1f30b | 974 | switch (rt->dst.error) { |
4500ebf8 JP |
975 | case EINVAL: |
976 | default: | |
977 | goto out; | |
978 | case EHOSTUNREACH: | |
979 | code = ICMP_HOST_UNREACH; | |
980 | break; | |
981 | case ENETUNREACH: | |
982 | code = ICMP_NET_UNREACH; | |
b45386ef | 983 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
4500ebf8 JP |
984 | break; |
985 | case EACCES: | |
986 | code = ICMP_PKT_FILTERED; | |
987 | break; | |
1da177e4 LT |
988 | } |
989 | ||
192132b9 | 990 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, |
385add90 | 991 | l3mdev_master_ifindex(skb->dev), 1); |
92d86829 DM |
992 | |
993 | send = true; | |
994 | if (peer) { | |
995 | now = jiffies; | |
996 | peer->rate_tokens += now - peer->rate_last; | |
997 | if (peer->rate_tokens > ip_rt_error_burst) | |
998 | peer->rate_tokens = ip_rt_error_burst; | |
999 | peer->rate_last = now; | |
1000 | if (peer->rate_tokens >= ip_rt_error_cost) | |
1001 | peer->rate_tokens -= ip_rt_error_cost; | |
1002 | else | |
1003 | send = false; | |
1d861aa4 | 1004 | inet_putpeer(peer); |
1da177e4 | 1005 | } |
92d86829 DM |
1006 | if (send) |
1007 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 LT |
1008 | |
1009 | out: kfree_skb(skb); | |
1010 | return 0; | |
e905a9ed | 1011 | } |
1da177e4 | 1012 | |
d851c12b | 1013 | static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
1da177e4 | 1014 | { |
d851c12b | 1015 | struct dst_entry *dst = &rt->dst; |
28d35bcd | 1016 | u32 old_mtu = ipv4_mtu(dst); |
4895c771 | 1017 | struct fib_result res; |
d52e5a7e | 1018 | bool lock = false; |
2c8cec5c | 1019 | |
d52e5a7e | 1020 | if (ip_mtu_locked(dst)) |
fa1e492a SK |
1021 | return; |
1022 | ||
28d35bcd | 1023 | if (old_mtu < mtu) |
3cdaa5be LW |
1024 | return; |
1025 | ||
d52e5a7e SD |
1026 | if (mtu < ip_rt_min_pmtu) { |
1027 | lock = true; | |
28d35bcd | 1028 | mtu = min(old_mtu, ip_rt_min_pmtu); |
d52e5a7e | 1029 | } |
2c8cec5c | 1030 | |
28d35bcd | 1031 | if (rt->rt_pmtu == mtu && !lock && |
f016229e TT |
1032 | time_before(jiffies, dst->expires - ip_rt_mtu_expires / 2)) |
1033 | return; | |
1034 | ||
c5ae7d41 | 1035 | rcu_read_lock(); |
0eeb075f | 1036 | if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) { |
eba618ab | 1037 | struct fib_nh_common *nhc = FIB_RES_NHC(res); |
4895c771 | 1038 | |
a5995e71 | 1039 | update_or_create_fnhe(nhc, fl4->daddr, 0, mtu, lock, |
aee06da6 | 1040 | jiffies + ip_rt_mtu_expires); |
4895c771 | 1041 | } |
c5ae7d41 | 1042 | rcu_read_unlock(); |
1da177e4 LT |
1043 | } |
1044 | ||
4895c771 DM |
1045 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1046 | struct sk_buff *skb, u32 mtu) | |
1047 | { | |
1048 | struct rtable *rt = (struct rtable *) dst; | |
1049 | struct flowi4 fl4; | |
1050 | ||
1051 | ip_rt_build_flow_key(&fl4, sk, skb); | |
d851c12b | 1052 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
4895c771 DM |
1053 | } |
1054 | ||
36393395 | 1055 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
d888f396 | 1056 | int oif, u8 protocol) |
36393395 | 1057 | { |
4895c771 | 1058 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
36393395 DM |
1059 | struct flowi4 fl4; |
1060 | struct rtable *rt; | |
d888f396 | 1061 | u32 mark = IP4_REPLY_MARK(net, skb->mark); |
1b3c61dc | 1062 | |
e2d118a1 | 1063 | __build_flow_key(net, &fl4, NULL, iph, oif, |
d888f396 | 1064 | RT_TOS(iph->tos), protocol, mark, 0); |
36393395 DM |
1065 | rt = __ip_route_output_key(net, &fl4); |
1066 | if (!IS_ERR(rt)) { | |
4895c771 | 1067 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
36393395 DM |
1068 | ip_rt_put(rt); |
1069 | } | |
1070 | } | |
1071 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); | |
1072 | ||
9cb3a50c | 1073 | static void __ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
36393395 | 1074 | { |
4895c771 DM |
1075 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1076 | struct flowi4 fl4; | |
1077 | struct rtable *rt; | |
36393395 | 1078 | |
e2d118a1 | 1079 | __build_flow_key(sock_net(sk), &fl4, sk, iph, 0, 0, 0, 0, 0); |
1b3c61dc LC |
1080 | |
1081 | if (!fl4.flowi4_mark) | |
1082 | fl4.flowi4_mark = IP4_REPLY_MARK(sock_net(sk), skb->mark); | |
1083 | ||
4895c771 DM |
1084 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
1085 | if (!IS_ERR(rt)) { | |
1086 | __ip_rt_update_pmtu(rt, &fl4, mtu); | |
1087 | ip_rt_put(rt); | |
1088 | } | |
36393395 | 1089 | } |
9cb3a50c SK |
1090 | |
1091 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) | |
1092 | { | |
1093 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
1094 | struct flowi4 fl4; | |
1095 | struct rtable *rt; | |
7f502361 | 1096 | struct dst_entry *odst = NULL; |
b44108db | 1097 | bool new = false; |
e2d118a1 | 1098 | struct net *net = sock_net(sk); |
9cb3a50c SK |
1099 | |
1100 | bh_lock_sock(sk); | |
482fc609 HFS |
1101 | |
1102 | if (!ip_sk_accept_pmtu(sk)) | |
1103 | goto out; | |
1104 | ||
7f502361 | 1105 | odst = sk_dst_get(sk); |
9cb3a50c | 1106 | |
7f502361 | 1107 | if (sock_owned_by_user(sk) || !odst) { |
9cb3a50c SK |
1108 | __ipv4_sk_update_pmtu(skb, sk, mtu); |
1109 | goto out; | |
1110 | } | |
1111 | ||
e2d118a1 | 1112 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
9cb3a50c | 1113 | |
7f502361 | 1114 | rt = (struct rtable *)odst; |
51456b29 | 1115 | if (odst->obsolete && !odst->ops->check(odst, 0)) { |
9cb3a50c SK |
1116 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1117 | if (IS_ERR(rt)) | |
1118 | goto out; | |
b44108db SK |
1119 | |
1120 | new = true; | |
9cb3a50c SK |
1121 | } |
1122 | ||
0f6c480f | 1123 | __ip_rt_update_pmtu((struct rtable *) xfrm_dst_path(&rt->dst), &fl4, mtu); |
9cb3a50c | 1124 | |
7f502361 | 1125 | if (!dst_check(&rt->dst, 0)) { |
b44108db SK |
1126 | if (new) |
1127 | dst_release(&rt->dst); | |
1128 | ||
9cb3a50c SK |
1129 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1130 | if (IS_ERR(rt)) | |
1131 | goto out; | |
1132 | ||
b44108db | 1133 | new = true; |
9cb3a50c SK |
1134 | } |
1135 | ||
b44108db | 1136 | if (new) |
7f502361 | 1137 | sk_dst_set(sk, &rt->dst); |
9cb3a50c SK |
1138 | |
1139 | out: | |
1140 | bh_unlock_sock(sk); | |
7f502361 | 1141 | dst_release(odst); |
9cb3a50c | 1142 | } |
36393395 | 1143 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
f39925db | 1144 | |
b42597e2 | 1145 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
1042caa7 | 1146 | int oif, u8 protocol) |
b42597e2 | 1147 | { |
4895c771 | 1148 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
b42597e2 DM |
1149 | struct flowi4 fl4; |
1150 | struct rtable *rt; | |
1151 | ||
e2d118a1 | 1152 | __build_flow_key(net, &fl4, NULL, iph, oif, |
1042caa7 | 1153 | RT_TOS(iph->tos), protocol, 0, 0); |
b42597e2 DM |
1154 | rt = __ip_route_output_key(net, &fl4); |
1155 | if (!IS_ERR(rt)) { | |
ceb33206 | 1156 | __ip_do_redirect(rt, skb, &fl4, false); |
b42597e2 DM |
1157 | ip_rt_put(rt); |
1158 | } | |
1159 | } | |
1160 | EXPORT_SYMBOL_GPL(ipv4_redirect); | |
1161 | ||
1162 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1163 | { | |
4895c771 DM |
1164 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1165 | struct flowi4 fl4; | |
1166 | struct rtable *rt; | |
e2d118a1 | 1167 | struct net *net = sock_net(sk); |
b42597e2 | 1168 | |
e2d118a1 LC |
1169 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
1170 | rt = __ip_route_output_key(net, &fl4); | |
4895c771 | 1171 | if (!IS_ERR(rt)) { |
ceb33206 | 1172 | __ip_do_redirect(rt, skb, &fl4, false); |
4895c771 DM |
1173 | ip_rt_put(rt); |
1174 | } | |
b42597e2 DM |
1175 | } |
1176 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); | |
1177 | ||
efbc368d DM |
1178 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
1179 | { | |
1180 | struct rtable *rt = (struct rtable *) dst; | |
1181 | ||
ceb33206 DM |
1182 | /* All IPV4 dsts are created with ->obsolete set to the value |
1183 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1184 | * into this function always. | |
1185 | * | |
387aa65a TT |
1186 | * When a PMTU/redirect information update invalidates a route, |
1187 | * this is indicated by setting obsolete to DST_OBSOLETE_KILL or | |
02afc7ad | 1188 | * DST_OBSOLETE_DEAD. |
ceb33206 | 1189 | */ |
387aa65a | 1190 | if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt)) |
efbc368d | 1191 | return NULL; |
d11a4dc1 | 1192 | return dst; |
1da177e4 LT |
1193 | } |
1194 | ||
20ff83f1 | 1195 | static void ipv4_send_dest_unreach(struct sk_buff *skb) |
1da177e4 | 1196 | { |
ed0de45a | 1197 | struct ip_options opt; |
c543cb4a | 1198 | int res; |
1da177e4 | 1199 | |
ed0de45a | 1200 | /* Recompile ip options since IPCB may not be valid anymore. |
20ff83f1 | 1201 | * Also check we have a reasonable ipv4 header. |
ed0de45a | 1202 | */ |
20ff83f1 ED |
1203 | if (!pskb_network_may_pull(skb, sizeof(struct iphdr)) || |
1204 | ip_hdr(skb)->version != 4 || ip_hdr(skb)->ihl < 5) | |
1205 | return; | |
c543cb4a | 1206 | |
20ff83f1 ED |
1207 | memset(&opt, 0, sizeof(opt)); |
1208 | if (ip_hdr(skb)->ihl > 5) { | |
1209 | if (!pskb_network_may_pull(skb, ip_hdr(skb)->ihl * 4)) | |
1210 | return; | |
1211 | opt.optlen = ip_hdr(skb)->ihl * 4 - sizeof(struct iphdr); | |
c543cb4a | 1212 | |
20ff83f1 ED |
1213 | rcu_read_lock(); |
1214 | res = __ip_options_compile(dev_net(skb->dev), &opt, skb, NULL); | |
1215 | rcu_read_unlock(); | |
ed0de45a | 1216 | |
20ff83f1 ED |
1217 | if (res) |
1218 | return; | |
1219 | } | |
ed0de45a | 1220 | __icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0, &opt); |
20ff83f1 ED |
1221 | } |
1222 | ||
1223 | static void ipv4_link_failure(struct sk_buff *skb) | |
1224 | { | |
1225 | struct rtable *rt; | |
1226 | ||
1227 | ipv4_send_dest_unreach(skb); | |
1da177e4 | 1228 | |
511c3f92 | 1229 | rt = skb_rtable(skb); |
5943634f DM |
1230 | if (rt) |
1231 | dst_set_expires(&rt->dst, 0); | |
1da177e4 LT |
1232 | } |
1233 | ||
ede2059d | 1234 | static int ip_rt_bug(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1235 | { |
91df42be JP |
1236 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
1237 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1238 | skb->dev ? skb->dev->name : "?"); | |
1da177e4 | 1239 | kfree_skb(skb); |
c378a9c0 | 1240 | WARN_ON(1); |
1da177e4 LT |
1241 | return 0; |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | We do not cache source address of outgoing interface, | |
1246 | because it is used only by IP RR, TS and SRR options, | |
1247 | so that it out of fast path. | |
1248 | ||
1249 | BTW remember: "addr" is allowed to be not aligned | |
1250 | in IP options! | |
1251 | */ | |
1252 | ||
8e36360a | 1253 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1254 | { |
a61ced5d | 1255 | __be32 src; |
1da177e4 | 1256 | |
c7537967 | 1257 | if (rt_is_output_route(rt)) |
c5be24ff | 1258 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1259 | else { |
8e36360a | 1260 | struct fib_result res; |
e351bb62 MÅ» |
1261 | struct iphdr *iph = ip_hdr(skb); |
1262 | struct flowi4 fl4 = { | |
1263 | .daddr = iph->daddr, | |
1264 | .saddr = iph->saddr, | |
1265 | .flowi4_tos = RT_TOS(iph->tos), | |
1266 | .flowi4_oif = rt->dst.dev->ifindex, | |
1267 | .flowi4_iif = skb->dev->ifindex, | |
1268 | .flowi4_mark = skb->mark, | |
1269 | }; | |
5e2b61f7 | 1270 | |
ebc0ffae | 1271 | rcu_read_lock(); |
0eeb075f | 1272 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0) |
eba618ab | 1273 | src = fib_result_prefsrc(dev_net(rt->dst.dev), &res); |
ebc0ffae | 1274 | else |
f8126f1d DM |
1275 | src = inet_select_addr(rt->dst.dev, |
1276 | rt_nexthop(rt, iph->daddr), | |
1277 | RT_SCOPE_UNIVERSE); | |
ebc0ffae ED |
1278 | rcu_read_unlock(); |
1279 | } | |
1da177e4 LT |
1280 | memcpy(addr, &src, 4); |
1281 | } | |
1282 | ||
c7066f70 | 1283 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1284 | static void set_class_tag(struct rtable *rt, u32 tag) |
1285 | { | |
d8d1f30b CG |
1286 | if (!(rt->dst.tclassid & 0xFFFF)) |
1287 | rt->dst.tclassid |= tag & 0xFFFF; | |
1288 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1289 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1290 | } |
1291 | #endif | |
1292 | ||
0dbaee3b DM |
1293 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1294 | { | |
7ed14d97 | 1295 | unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr); |
164a5e7a | 1296 | unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size, |
7ed14d97 | 1297 | ip_rt_min_advmss); |
0dbaee3b | 1298 | |
7ed14d97 | 1299 | return min(advmss, IPV4_MAX_PMTU - header_size); |
0dbaee3b DM |
1300 | } |
1301 | ||
ebb762f2 | 1302 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
d33e4553 | 1303 | { |
261663b0 | 1304 | const struct rtable *rt = (const struct rtable *) dst; |
5943634f DM |
1305 | unsigned int mtu = rt->rt_pmtu; |
1306 | ||
98d75c37 | 1307 | if (!mtu || time_after_eq(jiffies, rt->dst.expires)) |
5943634f | 1308 | mtu = dst_metric_raw(dst, RTAX_MTU); |
618f9bc7 | 1309 | |
38d523e2 | 1310 | if (mtu) |
618f9bc7 SK |
1311 | return mtu; |
1312 | ||
c780a049 | 1313 | mtu = READ_ONCE(dst->dev->mtu); |
d33e4553 | 1314 | |
d52e5a7e | 1315 | if (unlikely(ip_mtu_locked(dst))) { |
1550c171 | 1316 | if (rt->rt_gw_family && mtu > 576) |
d33e4553 DM |
1317 | mtu = 576; |
1318 | } | |
1319 | ||
14972cbd RP |
1320 | mtu = min_t(unsigned int, mtu, IP_MAX_MTU); |
1321 | ||
1322 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
1323 | } |
1324 | ||
a5995e71 | 1325 | static void ip_del_fnhe(struct fib_nh_common *nhc, __be32 daddr) |
94720e3a JA |
1326 | { |
1327 | struct fnhe_hash_bucket *hash; | |
1328 | struct fib_nh_exception *fnhe, __rcu **fnhe_p; | |
1329 | u32 hval = fnhe_hashfun(daddr); | |
1330 | ||
1331 | spin_lock_bh(&fnhe_lock); | |
1332 | ||
a5995e71 | 1333 | hash = rcu_dereference_protected(nhc->nhc_exceptions, |
94720e3a JA |
1334 | lockdep_is_held(&fnhe_lock)); |
1335 | hash += hval; | |
1336 | ||
1337 | fnhe_p = &hash->chain; | |
1338 | fnhe = rcu_dereference_protected(*fnhe_p, lockdep_is_held(&fnhe_lock)); | |
1339 | while (fnhe) { | |
1340 | if (fnhe->fnhe_daddr == daddr) { | |
1341 | rcu_assign_pointer(*fnhe_p, rcu_dereference_protected( | |
1342 | fnhe->fnhe_next, lockdep_is_held(&fnhe_lock))); | |
ee60ad21 XL |
1343 | /* set fnhe_daddr to 0 to ensure it won't bind with |
1344 | * new dsts in rt_bind_exception(). | |
1345 | */ | |
1346 | fnhe->fnhe_daddr = 0; | |
94720e3a JA |
1347 | fnhe_flush_routes(fnhe); |
1348 | kfree_rcu(fnhe, rcu); | |
1349 | break; | |
1350 | } | |
1351 | fnhe_p = &fnhe->fnhe_next; | |
1352 | fnhe = rcu_dereference_protected(fnhe->fnhe_next, | |
1353 | lockdep_is_held(&fnhe_lock)); | |
1354 | } | |
1355 | ||
1356 | spin_unlock_bh(&fnhe_lock); | |
1357 | } | |
1358 | ||
a5995e71 DA |
1359 | static struct fib_nh_exception *find_exception(struct fib_nh_common *nhc, |
1360 | __be32 daddr) | |
4895c771 | 1361 | { |
a5995e71 | 1362 | struct fnhe_hash_bucket *hash = rcu_dereference(nhc->nhc_exceptions); |
4895c771 DM |
1363 | struct fib_nh_exception *fnhe; |
1364 | u32 hval; | |
1365 | ||
f2bb4bed DM |
1366 | if (!hash) |
1367 | return NULL; | |
1368 | ||
d3a25c98 | 1369 | hval = fnhe_hashfun(daddr); |
4895c771 DM |
1370 | |
1371 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; | |
1372 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
94720e3a JA |
1373 | if (fnhe->fnhe_daddr == daddr) { |
1374 | if (fnhe->fnhe_expires && | |
1375 | time_after(jiffies, fnhe->fnhe_expires)) { | |
a5995e71 | 1376 | ip_del_fnhe(nhc, daddr); |
94720e3a JA |
1377 | break; |
1378 | } | |
f2bb4bed | 1379 | return fnhe; |
94720e3a | 1380 | } |
f2bb4bed DM |
1381 | } |
1382 | return NULL; | |
1383 | } | |
aee06da6 | 1384 | |
50d889b1 DA |
1385 | /* MTU selection: |
1386 | * 1. mtu on route is locked - use it | |
1387 | * 2. mtu from nexthop exception | |
1388 | * 3. mtu from egress device | |
1389 | */ | |
1390 | ||
1391 | u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr) | |
1392 | { | |
eba618ab DA |
1393 | struct fib_nh_common *nhc = res->nhc; |
1394 | struct net_device *dev = nhc->nhc_dev; | |
50d889b1 | 1395 | struct fib_info *fi = res->fi; |
50d889b1 DA |
1396 | u32 mtu = 0; |
1397 | ||
1398 | if (dev_net(dev)->ipv4.sysctl_ip_fwd_use_pmtu || | |
1399 | fi->fib_metrics->metrics[RTAX_LOCK - 1] & (1 << RTAX_MTU)) | |
1400 | mtu = fi->fib_mtu; | |
1401 | ||
1402 | if (likely(!mtu)) { | |
1403 | struct fib_nh_exception *fnhe; | |
1404 | ||
a5995e71 | 1405 | fnhe = find_exception(nhc, daddr); |
50d889b1 DA |
1406 | if (fnhe && !time_after_eq(jiffies, fnhe->fnhe_expires)) |
1407 | mtu = fnhe->fnhe_pmtu; | |
1408 | } | |
1409 | ||
1410 | if (likely(!mtu)) | |
1411 | mtu = min(READ_ONCE(dev->mtu), IP_MAX_MTU); | |
1412 | ||
eba618ab | 1413 | return mtu - lwtunnel_headroom(nhc->nhc_lwtstate, mtu); |
50d889b1 DA |
1414 | } |
1415 | ||
caacf05e | 1416 | static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, |
a4c2fd7f | 1417 | __be32 daddr, const bool do_cache) |
f2bb4bed | 1418 | { |
caacf05e DM |
1419 | bool ret = false; |
1420 | ||
c5038a83 | 1421 | spin_lock_bh(&fnhe_lock); |
f2bb4bed | 1422 | |
c5038a83 | 1423 | if (daddr == fnhe->fnhe_daddr) { |
2ffae99d TT |
1424 | struct rtable __rcu **porig; |
1425 | struct rtable *orig; | |
5aad1de5 | 1426 | int genid = fnhe_genid(dev_net(rt->dst.dev)); |
2ffae99d TT |
1427 | |
1428 | if (rt_is_input_route(rt)) | |
1429 | porig = &fnhe->fnhe_rth_input; | |
1430 | else | |
1431 | porig = &fnhe->fnhe_rth_output; | |
1432 | orig = rcu_dereference(*porig); | |
5aad1de5 TT |
1433 | |
1434 | if (fnhe->fnhe_genid != genid) { | |
1435 | fnhe->fnhe_genid = genid; | |
13d82bf5 SK |
1436 | fnhe->fnhe_gw = 0; |
1437 | fnhe->fnhe_pmtu = 0; | |
1438 | fnhe->fnhe_expires = 0; | |
0e8411e4 | 1439 | fnhe->fnhe_mtu_locked = false; |
2ffae99d TT |
1440 | fnhe_flush_routes(fnhe); |
1441 | orig = NULL; | |
13d82bf5 | 1442 | } |
387aa65a | 1443 | fill_route_from_fnhe(rt, fnhe); |
1550c171 DA |
1444 | if (!rt->rt_gw4) { |
1445 | rt->rt_gw4 = daddr; | |
1446 | rt->rt_gw_family = AF_INET; | |
1447 | } | |
f2bb4bed | 1448 | |
a4c2fd7f | 1449 | if (do_cache) { |
0830106c | 1450 | dst_hold(&rt->dst); |
2ffae99d | 1451 | rcu_assign_pointer(*porig, rt); |
0830106c | 1452 | if (orig) { |
95c47f9c | 1453 | dst_dev_put(&orig->dst); |
0830106c | 1454 | dst_release(&orig->dst); |
0830106c | 1455 | } |
2ffae99d TT |
1456 | ret = true; |
1457 | } | |
c5038a83 DM |
1458 | |
1459 | fnhe->fnhe_stamp = jiffies; | |
c5038a83 DM |
1460 | } |
1461 | spin_unlock_bh(&fnhe_lock); | |
caacf05e DM |
1462 | |
1463 | return ret; | |
54764bb6 ED |
1464 | } |
1465 | ||
87063a1f | 1466 | static bool rt_cache_route(struct fib_nh_common *nhc, struct rtable *rt) |
f2bb4bed | 1467 | { |
d26b3a7c | 1468 | struct rtable *orig, *prev, **p; |
caacf05e | 1469 | bool ret = true; |
f2bb4bed | 1470 | |
d26b3a7c | 1471 | if (rt_is_input_route(rt)) { |
0f457a36 | 1472 | p = (struct rtable **)&nhc->nhc_rth_input; |
d26b3a7c | 1473 | } else { |
0f457a36 | 1474 | p = (struct rtable **)raw_cpu_ptr(nhc->nhc_pcpu_rth_output); |
d26b3a7c | 1475 | } |
f2bb4bed DM |
1476 | orig = *p; |
1477 | ||
0830106c WW |
1478 | /* hold dst before doing cmpxchg() to avoid race condition |
1479 | * on this dst | |
1480 | */ | |
1481 | dst_hold(&rt->dst); | |
f2bb4bed DM |
1482 | prev = cmpxchg(p, orig, rt); |
1483 | if (prev == orig) { | |
0830106c | 1484 | if (orig) { |
95c47f9c | 1485 | dst_dev_put(&orig->dst); |
0830106c | 1486 | dst_release(&orig->dst); |
0830106c WW |
1487 | } |
1488 | } else { | |
1489 | dst_release(&rt->dst); | |
caacf05e | 1490 | ret = false; |
0830106c | 1491 | } |
caacf05e DM |
1492 | |
1493 | return ret; | |
1494 | } | |
1495 | ||
5055c371 ED |
1496 | struct uncached_list { |
1497 | spinlock_t lock; | |
1498 | struct list_head head; | |
1499 | }; | |
1500 | ||
1501 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt_uncached_list); | |
caacf05e | 1502 | |
510c321b | 1503 | void rt_add_uncached_list(struct rtable *rt) |
caacf05e | 1504 | { |
5055c371 ED |
1505 | struct uncached_list *ul = raw_cpu_ptr(&rt_uncached_list); |
1506 | ||
1507 | rt->rt_uncached_list = ul; | |
1508 | ||
1509 | spin_lock_bh(&ul->lock); | |
1510 | list_add_tail(&rt->rt_uncached, &ul->head); | |
1511 | spin_unlock_bh(&ul->lock); | |
caacf05e DM |
1512 | } |
1513 | ||
510c321b | 1514 | void rt_del_uncached_list(struct rtable *rt) |
caacf05e | 1515 | { |
78df76a0 | 1516 | if (!list_empty(&rt->rt_uncached)) { |
5055c371 ED |
1517 | struct uncached_list *ul = rt->rt_uncached_list; |
1518 | ||
1519 | spin_lock_bh(&ul->lock); | |
caacf05e | 1520 | list_del(&rt->rt_uncached); |
5055c371 | 1521 | spin_unlock_bh(&ul->lock); |
caacf05e DM |
1522 | } |
1523 | } | |
1524 | ||
510c321b XL |
1525 | static void ipv4_dst_destroy(struct dst_entry *dst) |
1526 | { | |
510c321b XL |
1527 | struct rtable *rt = (struct rtable *)dst; |
1528 | ||
1620a336 | 1529 | ip_dst_metrics_put(dst); |
510c321b XL |
1530 | rt_del_uncached_list(rt); |
1531 | } | |
1532 | ||
caacf05e DM |
1533 | void rt_flush_dev(struct net_device *dev) |
1534 | { | |
5055c371 ED |
1535 | struct rtable *rt; |
1536 | int cpu; | |
1537 | ||
1538 | for_each_possible_cpu(cpu) { | |
1539 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
caacf05e | 1540 | |
5055c371 ED |
1541 | spin_lock_bh(&ul->lock); |
1542 | list_for_each_entry(rt, &ul->head, rt_uncached) { | |
caacf05e DM |
1543 | if (rt->dst.dev != dev) |
1544 | continue; | |
8d7017fd | 1545 | rt->dst.dev = blackhole_netdev; |
caacf05e DM |
1546 | dev_hold(rt->dst.dev); |
1547 | dev_put(dev); | |
1548 | } | |
5055c371 | 1549 | spin_unlock_bh(&ul->lock); |
4895c771 DM |
1550 | } |
1551 | } | |
1552 | ||
4331debc | 1553 | static bool rt_cache_valid(const struct rtable *rt) |
d2d68ba9 | 1554 | { |
4331debc ED |
1555 | return rt && |
1556 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1557 | !rt_is_expired(rt); | |
d2d68ba9 DM |
1558 | } |
1559 | ||
f2bb4bed | 1560 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
5e2b61f7 | 1561 | const struct fib_result *res, |
f2bb4bed | 1562 | struct fib_nh_exception *fnhe, |
a4c2fd7f WW |
1563 | struct fib_info *fi, u16 type, u32 itag, |
1564 | const bool do_cache) | |
1da177e4 | 1565 | { |
caacf05e DM |
1566 | bool cached = false; |
1567 | ||
1da177e4 | 1568 | if (fi) { |
eba618ab | 1569 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
4895c771 | 1570 | |
0f5f7d7b DA |
1571 | if (nhc->nhc_gw_family && nhc->nhc_scope == RT_SCOPE_LINK) { |
1572 | rt->rt_gw_family = nhc->nhc_gw_family; | |
1573 | /* only INET and INET6 are supported */ | |
1574 | if (likely(nhc->nhc_gw_family == AF_INET)) | |
1575 | rt->rt_gw4 = nhc->nhc_gw.ipv4; | |
1576 | else | |
1577 | rt->rt_gw6 = nhc->nhc_gw.ipv6; | |
155e8336 | 1578 | } |
0f5f7d7b | 1579 | |
e1255ed4 DA |
1580 | ip_dst_init_metrics(&rt->dst, fi->fib_metrics); |
1581 | ||
c7066f70 | 1582 | #ifdef CONFIG_IP_ROUTE_CLASSID |
dcb1ecb5 | 1583 | if (nhc->nhc_family == AF_INET) { |
87063a1f DA |
1584 | struct fib_nh *nh; |
1585 | ||
1586 | nh = container_of(nhc, struct fib_nh, nh_common); | |
1587 | rt->dst.tclassid = nh->nh_tclassid; | |
1588 | } | |
1da177e4 | 1589 | #endif |
87063a1f | 1590 | rt->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate); |
c5038a83 | 1591 | if (unlikely(fnhe)) |
a4c2fd7f WW |
1592 | cached = rt_bind_exception(rt, fnhe, daddr, do_cache); |
1593 | else if (do_cache) | |
87063a1f | 1594 | cached = rt_cache_route(nhc, rt); |
155e8336 JA |
1595 | if (unlikely(!cached)) { |
1596 | /* Routes we intend to cache in nexthop exception or | |
1597 | * FIB nexthop have the DST_NOCACHE bit clear. | |
1598 | * However, if we are unsuccessful at storing this | |
1599 | * route into the cache we really need to set it. | |
1600 | */ | |
1550c171 DA |
1601 | if (!rt->rt_gw4) { |
1602 | rt->rt_gw_family = AF_INET; | |
1603 | rt->rt_gw4 = daddr; | |
1604 | } | |
155e8336 JA |
1605 | rt_add_uncached_list(rt); |
1606 | } | |
1607 | } else | |
caacf05e | 1608 | rt_add_uncached_list(rt); |
defb3519 | 1609 | |
c7066f70 | 1610 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 | 1611 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
85b91b03 | 1612 | set_class_tag(rt, res->tclassid); |
1da177e4 LT |
1613 | #endif |
1614 | set_class_tag(rt, itag); | |
1615 | #endif | |
1da177e4 LT |
1616 | } |
1617 | ||
9ab179d8 DA |
1618 | struct rtable *rt_dst_alloc(struct net_device *dev, |
1619 | unsigned int flags, u16 type, | |
1620 | bool nopolicy, bool noxfrm, bool will_cache) | |
0c4dcd58 | 1621 | { |
d08c4f35 DA |
1622 | struct rtable *rt; |
1623 | ||
1624 | rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, | |
a4c2fd7f | 1625 | (will_cache ? 0 : DST_HOST) | |
d08c4f35 | 1626 | (nopolicy ? DST_NOPOLICY : 0) | |
b2a9c0ed | 1627 | (noxfrm ? DST_NOXFRM : 0)); |
d08c4f35 DA |
1628 | |
1629 | if (rt) { | |
1630 | rt->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
1631 | rt->rt_flags = flags; | |
1632 | rt->rt_type = type; | |
1633 | rt->rt_is_input = 0; | |
1634 | rt->rt_iif = 0; | |
1635 | rt->rt_pmtu = 0; | |
d52e5a7e | 1636 | rt->rt_mtu_locked = 0; |
1550c171 DA |
1637 | rt->rt_gw_family = 0; |
1638 | rt->rt_gw4 = 0; | |
d08c4f35 DA |
1639 | INIT_LIST_HEAD(&rt->rt_uncached); |
1640 | ||
1641 | rt->dst.output = ip_output; | |
1642 | if (flags & RTCF_LOCAL) | |
1643 | rt->dst.input = ip_local_deliver; | |
1644 | } | |
1645 | ||
1646 | return rt; | |
0c4dcd58 | 1647 | } |
9ab179d8 | 1648 | EXPORT_SYMBOL(rt_dst_alloc); |
0c4dcd58 | 1649 | |
5b18f128 SS |
1650 | struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt) |
1651 | { | |
1652 | struct rtable *new_rt; | |
1653 | ||
1654 | new_rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, | |
1655 | rt->dst.flags); | |
1656 | ||
1657 | if (new_rt) { | |
1658 | new_rt->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
1659 | new_rt->rt_flags = rt->rt_flags; | |
1660 | new_rt->rt_type = rt->rt_type; | |
1661 | new_rt->rt_is_input = rt->rt_is_input; | |
1662 | new_rt->rt_iif = rt->rt_iif; | |
1663 | new_rt->rt_pmtu = rt->rt_pmtu; | |
1664 | new_rt->rt_mtu_locked = rt->rt_mtu_locked; | |
1665 | new_rt->rt_gw_family = rt->rt_gw_family; | |
1666 | if (rt->rt_gw_family == AF_INET) | |
1667 | new_rt->rt_gw4 = rt->rt_gw4; | |
1668 | else if (rt->rt_gw_family == AF_INET6) | |
1669 | new_rt->rt_gw6 = rt->rt_gw6; | |
1670 | INIT_LIST_HEAD(&new_rt->rt_uncached); | |
1671 | ||
1672 | new_rt->dst.flags |= DST_HOST; | |
1673 | new_rt->dst.input = rt->dst.input; | |
1674 | new_rt->dst.output = rt->dst.output; | |
1675 | new_rt->dst.error = rt->dst.error; | |
1676 | new_rt->dst.lastuse = jiffies; | |
1677 | new_rt->dst.lwtstate = lwtstate_get(rt->dst.lwtstate); | |
1678 | } | |
1679 | return new_rt; | |
1680 | } | |
1681 | EXPORT_SYMBOL(rt_dst_clone); | |
1682 | ||
96d36220 | 1683 | /* called in rcu_read_lock() section */ |
bc044e8d PA |
1684 | int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1685 | u8 tos, struct net_device *dev, | |
1686 | struct in_device *in_dev, u32 *itag) | |
1da177e4 | 1687 | { |
b5f7e755 | 1688 | int err; |
1da177e4 LT |
1689 | |
1690 | /* Primary sanity checks. */ | |
51456b29 | 1691 | if (!in_dev) |
1da177e4 LT |
1692 | return -EINVAL; |
1693 | ||
1e637c74 | 1694 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
d0daebc3 | 1695 | skb->protocol != htons(ETH_P_IP)) |
bc044e8d | 1696 | return -EINVAL; |
1da177e4 | 1697 | |
75fea73d | 1698 | if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev)) |
bc044e8d | 1699 | return -EINVAL; |
d0daebc3 | 1700 | |
f97c1e0c | 1701 | if (ipv4_is_zeronet(saddr)) { |
1d2f4ebb EC |
1702 | if (!ipv4_is_local_multicast(daddr) && |
1703 | ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
bc044e8d | 1704 | return -EINVAL; |
b5f7e755 | 1705 | } else { |
9e56e380 | 1706 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
bc044e8d | 1707 | in_dev, itag); |
b5f7e755 | 1708 | if (err < 0) |
bc044e8d | 1709 | return err; |
b5f7e755 | 1710 | } |
bc044e8d PA |
1711 | return 0; |
1712 | } | |
1713 | ||
1714 | /* called in rcu_read_lock() section */ | |
1715 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
1716 | u8 tos, struct net_device *dev, int our) | |
1717 | { | |
1718 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
1719 | unsigned int flags = RTCF_MULTICAST; | |
1720 | struct rtable *rth; | |
1721 | u32 itag = 0; | |
1722 | int err; | |
1723 | ||
1724 | err = ip_mc_validate_source(skb, daddr, saddr, tos, dev, in_dev, &itag); | |
1725 | if (err) | |
1726 | return err; | |
1727 | ||
d08c4f35 DA |
1728 | if (our) |
1729 | flags |= RTCF_LOCAL; | |
1730 | ||
1731 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST, | |
f2bb4bed | 1732 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); |
1da177e4 | 1733 | if (!rth) |
bc044e8d | 1734 | return -ENOBUFS; |
1da177e4 | 1735 | |
cf911662 DM |
1736 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1737 | rth->dst.tclassid = itag; | |
1738 | #endif | |
d8d1f30b | 1739 | rth->dst.output = ip_rt_bug; |
9917e1e8 | 1740 | rth->rt_is_input= 1; |
1da177e4 LT |
1741 | |
1742 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1743 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1744 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1745 | #endif |
1746 | RT_CACHE_STAT_INC(in_slow_mc); | |
1747 | ||
89aef892 DM |
1748 | skb_dst_set(skb, &rth->dst); |
1749 | return 0; | |
1da177e4 LT |
1750 | } |
1751 | ||
1752 | ||
1753 | static void ip_handle_martian_source(struct net_device *dev, | |
1754 | struct in_device *in_dev, | |
1755 | struct sk_buff *skb, | |
9e12bb22 AV |
1756 | __be32 daddr, |
1757 | __be32 saddr) | |
1da177e4 LT |
1758 | { |
1759 | RT_CACHE_STAT_INC(in_martian_src); | |
1760 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1761 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1762 | /* | |
1763 | * RFC1812 recommendation, if source is martian, | |
1764 | * the only hint is MAC header. | |
1765 | */ | |
058bd4d2 | 1766 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
673d57e7 | 1767 | &daddr, &saddr, dev->name); |
98e399f8 | 1768 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
058bd4d2 JP |
1769 | print_hex_dump(KERN_WARNING, "ll header: ", |
1770 | DUMP_PREFIX_OFFSET, 16, 1, | |
1771 | skb_mac_header(skb), | |
b2c85100 | 1772 | dev->hard_header_len, false); |
1da177e4 LT |
1773 | } |
1774 | } | |
1775 | #endif | |
1776 | } | |
1777 | ||
47360228 | 1778 | /* called in rcu_read_lock() section */ |
5969f71d | 1779 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1780 | const struct fib_result *res, |
5969f71d | 1781 | struct in_device *in_dev, |
c6cffba4 | 1782 | __be32 daddr, __be32 saddr, u32 tos) |
1da177e4 | 1783 | { |
eba618ab DA |
1784 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
1785 | struct net_device *dev = nhc->nhc_dev; | |
2ffae99d | 1786 | struct fib_nh_exception *fnhe; |
1da177e4 LT |
1787 | struct rtable *rth; |
1788 | int err; | |
1789 | struct in_device *out_dev; | |
d2d68ba9 | 1790 | bool do_cache; |
fbdc0ad0 | 1791 | u32 itag = 0; |
1da177e4 LT |
1792 | |
1793 | /* get a working reference to the output device */ | |
eba618ab | 1794 | out_dev = __in_dev_get_rcu(dev); |
51456b29 | 1795 | if (!out_dev) { |
e87cc472 | 1796 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
1da177e4 LT |
1797 | return -EINVAL; |
1798 | } | |
1799 | ||
5c04c819 | 1800 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
9e56e380 | 1801 | in_dev->dev, in_dev, &itag); |
1da177e4 | 1802 | if (err < 0) { |
e905a9ed | 1803 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1804 | saddr); |
e905a9ed | 1805 | |
1da177e4 LT |
1806 | goto cleanup; |
1807 | } | |
1808 | ||
e81da0e1 JA |
1809 | do_cache = res->fi && !itag; |
1810 | if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) && | |
eba618ab | 1811 | skb->protocol == htons(ETH_P_IP)) { |
bdf00467 | 1812 | __be32 gw; |
eba618ab | 1813 | |
bdf00467 | 1814 | gw = nhc->nhc_gw_family == AF_INET ? nhc->nhc_gw.ipv4 : 0; |
eba618ab DA |
1815 | if (IN_DEV_SHARED_MEDIA(out_dev) || |
1816 | inet_addr_onlink(out_dev, saddr, gw)) | |
1817 | IPCB(skb)->flags |= IPSKB_DOREDIRECT; | |
1818 | } | |
1da177e4 LT |
1819 | |
1820 | if (skb->protocol != htons(ETH_P_IP)) { | |
1821 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1822 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1823 | * |
1824 | * Proxy arp feature have been extended to allow, ARP | |
1825 | * replies back to the same interface, to support | |
1826 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1827 | */ |
65324144 JDB |
1828 | if (out_dev == in_dev && |
1829 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1830 | err = -EINVAL; |
1831 | goto cleanup; | |
1832 | } | |
1833 | } | |
1834 | ||
a5995e71 | 1835 | fnhe = find_exception(nhc, daddr); |
e81da0e1 | 1836 | if (do_cache) { |
94720e3a | 1837 | if (fnhe) |
2ffae99d | 1838 | rth = rcu_dereference(fnhe->fnhe_rth_input); |
94720e3a | 1839 | else |
0f457a36 | 1840 | rth = rcu_dereference(nhc->nhc_rth_input); |
e81da0e1 JA |
1841 | if (rt_cache_valid(rth)) { |
1842 | skb_dst_set_noref(skb, &rth->dst); | |
1843 | goto out; | |
d2d68ba9 DM |
1844 | } |
1845 | } | |
f2bb4bed | 1846 | |
d08c4f35 | 1847 | rth = rt_dst_alloc(out_dev->dev, 0, res->type, |
5c1e6aa3 | 1848 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
d2d68ba9 | 1849 | IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); |
1da177e4 LT |
1850 | if (!rth) { |
1851 | err = -ENOBUFS; | |
1852 | goto cleanup; | |
1853 | } | |
1854 | ||
9917e1e8 | 1855 | rth->rt_is_input = 1; |
a6254864 | 1856 | RT_CACHE_STAT_INC(in_slow_tot); |
1da177e4 | 1857 | |
d8d1f30b | 1858 | rth->dst.input = ip_forward; |
1da177e4 | 1859 | |
a4c2fd7f WW |
1860 | rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag, |
1861 | do_cache); | |
9942895b | 1862 | lwtunnel_set_redirect(&rth->dst); |
c6cffba4 | 1863 | skb_dst_set(skb, &rth->dst); |
d2d68ba9 | 1864 | out: |
1da177e4 LT |
1865 | err = 0; |
1866 | cleanup: | |
1da177e4 | 1867 | return err; |
e905a9ed | 1868 | } |
1da177e4 | 1869 | |
79a13159 | 1870 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
79a13159 | 1871 | /* To make ICMP packets follow the right flow, the multipath hash is |
bf4e0a3d | 1872 | * calculated from the inner IP addresses. |
79a13159 | 1873 | */ |
bf4e0a3d NA |
1874 | static void ip_multipath_l3_keys(const struct sk_buff *skb, |
1875 | struct flow_keys *hash_keys) | |
79a13159 PN |
1876 | { |
1877 | const struct iphdr *outer_iph = ip_hdr(skb); | |
6f74b6c2 | 1878 | const struct iphdr *key_iph = outer_iph; |
bf4e0a3d | 1879 | const struct iphdr *inner_iph; |
79a13159 PN |
1880 | const struct icmphdr *icmph; |
1881 | struct iphdr _inner_iph; | |
bf4e0a3d NA |
1882 | struct icmphdr _icmph; |
1883 | ||
bf4e0a3d | 1884 | if (likely(outer_iph->protocol != IPPROTO_ICMP)) |
6f74b6c2 | 1885 | goto out; |
79a13159 PN |
1886 | |
1887 | if (unlikely((outer_iph->frag_off & htons(IP_OFFSET)) != 0)) | |
6f74b6c2 | 1888 | goto out; |
79a13159 PN |
1889 | |
1890 | icmph = skb_header_pointer(skb, outer_iph->ihl * 4, sizeof(_icmph), | |
1891 | &_icmph); | |
1892 | if (!icmph) | |
6f74b6c2 | 1893 | goto out; |
79a13159 PN |
1894 | |
1895 | if (icmph->type != ICMP_DEST_UNREACH && | |
1896 | icmph->type != ICMP_REDIRECT && | |
1897 | icmph->type != ICMP_TIME_EXCEEDED && | |
bf4e0a3d | 1898 | icmph->type != ICMP_PARAMETERPROB) |
6f74b6c2 | 1899 | goto out; |
79a13159 PN |
1900 | |
1901 | inner_iph = skb_header_pointer(skb, | |
1902 | outer_iph->ihl * 4 + sizeof(_icmph), | |
1903 | sizeof(_inner_iph), &_inner_iph); | |
1904 | if (!inner_iph) | |
6f74b6c2 DA |
1905 | goto out; |
1906 | ||
1907 | key_iph = inner_iph; | |
1908 | out: | |
1909 | hash_keys->addrs.v4addrs.src = key_iph->saddr; | |
1910 | hash_keys->addrs.v4addrs.dst = key_iph->daddr; | |
bf4e0a3d | 1911 | } |
79a13159 | 1912 | |
bf4e0a3d | 1913 | /* if skb is set it will be used and fl4 can be NULL */ |
7efc0b6b | 1914 | int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, |
e37b1e97 | 1915 | const struct sk_buff *skb, struct flow_keys *flkeys) |
bf4e0a3d | 1916 | { |
2a8e4997 | 1917 | u32 multipath_hash = fl4 ? fl4->flowi4_multipath_hash : 0; |
bf4e0a3d NA |
1918 | struct flow_keys hash_keys; |
1919 | u32 mhash; | |
79a13159 | 1920 | |
bf4e0a3d NA |
1921 | switch (net->ipv4.sysctl_fib_multipath_hash_policy) { |
1922 | case 0: | |
1923 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1924 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1925 | if (skb) { | |
1926 | ip_multipath_l3_keys(skb, &hash_keys); | |
1927 | } else { | |
1928 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
1929 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1930 | } | |
1931 | break; | |
1932 | case 1: | |
1933 | /* skb is currently provided only when forwarding */ | |
1934 | if (skb) { | |
1935 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
1936 | struct flow_keys keys; | |
1937 | ||
1938 | /* short-circuit if we already have L4 hash present */ | |
1939 | if (skb->l4_hash) | |
1940 | return skb_get_hash_raw(skb) >> 1; | |
ec7127a5 | 1941 | |
bf4e0a3d | 1942 | memset(&hash_keys, 0, sizeof(hash_keys)); |
1fe4b118 | 1943 | |
ec7127a5 | 1944 | if (!flkeys) { |
e37b1e97 | 1945 | skb_flow_dissect_flow_keys(skb, &keys, flag); |
ec7127a5 | 1946 | flkeys = &keys; |
e37b1e97 | 1947 | } |
ec7127a5 DA |
1948 | |
1949 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1950 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
1951 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
1952 | hash_keys.ports.src = flkeys->ports.src; | |
1953 | hash_keys.ports.dst = flkeys->ports.dst; | |
1954 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
bf4e0a3d NA |
1955 | } else { |
1956 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1957 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1958 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
1959 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1960 | hash_keys.ports.src = fl4->fl4_sport; | |
1961 | hash_keys.ports.dst = fl4->fl4_dport; | |
1962 | hash_keys.basic.ip_proto = fl4->flowi4_proto; | |
1963 | } | |
1964 | break; | |
363887a2 SS |
1965 | case 2: |
1966 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
363887a2 SS |
1967 | /* skb is currently provided only when forwarding */ |
1968 | if (skb) { | |
1969 | struct flow_keys keys; | |
1970 | ||
1971 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
828b2b44 SS |
1972 | /* Inner can be v4 or v6 */ |
1973 | if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
1974 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1975 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; | |
1976 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
1977 | } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
1978 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
1979 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
1980 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
1981 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
1982 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
1983 | } else { | |
1984 | /* Same as case 0 */ | |
1985 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1986 | ip_multipath_l3_keys(skb, &hash_keys); | |
1987 | } | |
363887a2 SS |
1988 | } else { |
1989 | /* Same as case 0 */ | |
828b2b44 | 1990 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
363887a2 SS |
1991 | hash_keys.addrs.v4addrs.src = fl4->saddr; |
1992 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
1993 | } | |
1994 | break; | |
bf4e0a3d NA |
1995 | } |
1996 | mhash = flow_hash_from_keys(&hash_keys); | |
79a13159 | 1997 | |
24ba1440 | 1998 | if (multipath_hash) |
1999 | mhash = jhash_2words(mhash, multipath_hash, 0); | |
2000 | ||
bf4e0a3d NA |
2001 | return mhash >> 1; |
2002 | } | |
79a13159 PN |
2003 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
2004 | ||
5969f71d SH |
2005 | static int ip_mkroute_input(struct sk_buff *skb, |
2006 | struct fib_result *res, | |
5969f71d | 2007 | struct in_device *in_dev, |
e37b1e97 RP |
2008 | __be32 daddr, __be32 saddr, u32 tos, |
2009 | struct flow_keys *hkeys) | |
1da177e4 | 2010 | { |
1da177e4 | 2011 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
5481d73f | 2012 | if (res->fi && fib_info_num_path(res->fi) > 1) { |
7efc0b6b | 2013 | int h = fib_multipath_hash(res->fi->fib_net, NULL, skb, hkeys); |
0e884c78 | 2014 | |
0e884c78 PN |
2015 | fib_select_multipath(res, h); |
2016 | } | |
1da177e4 LT |
2017 | #endif |
2018 | ||
2019 | /* create a routing cache entry */ | |
c6cffba4 | 2020 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
1da177e4 LT |
2021 | } |
2022 | ||
1da177e4 LT |
2023 | /* |
2024 | * NOTE. We drop all the packets that has local source | |
2025 | * addresses, because every properly looped back packet | |
2026 | * must have correct destination already attached by output routine. | |
2027 | * | |
2028 | * Such approach solves two big problems: | |
2029 | * 1. Not simplex devices are handled properly. | |
2030 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 2031 | * called with rcu_read_lock() |
1da177e4 LT |
2032 | */ |
2033 | ||
9e12bb22 | 2034 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
5510cdf7 DA |
2035 | u8 tos, struct net_device *dev, |
2036 | struct fib_result *res) | |
1da177e4 | 2037 | { |
96d36220 | 2038 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
e37b1e97 RP |
2039 | struct flow_keys *flkeys = NULL, _flkeys; |
2040 | struct net *net = dev_net(dev); | |
1b7179d3 | 2041 | struct ip_tunnel_info *tun_info; |
e37b1e97 | 2042 | int err = -EINVAL; |
95c96174 | 2043 | unsigned int flags = 0; |
1da177e4 | 2044 | u32 itag = 0; |
95c96174 | 2045 | struct rtable *rth; |
e37b1e97 | 2046 | struct flowi4 fl4; |
0a90478b | 2047 | bool do_cache = true; |
1da177e4 LT |
2048 | |
2049 | /* IP on this device is disabled. */ | |
2050 | ||
2051 | if (!in_dev) | |
2052 | goto out; | |
2053 | ||
2054 | /* Check for the most weird martians, which can be not detected | |
2055 | by fib_lookup. | |
2056 | */ | |
2057 | ||
61adedf3 | 2058 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2059 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
1b7179d3 TG |
2060 | fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id; |
2061 | else | |
2062 | fl4.flowi4_tun_key.tun_id = 0; | |
f38a9eb1 TG |
2063 | skb_dst_drop(skb); |
2064 | ||
d0daebc3 | 2065 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
1da177e4 LT |
2066 | goto martian_source; |
2067 | ||
5510cdf7 DA |
2068 | res->fi = NULL; |
2069 | res->table = NULL; | |
27a954bd | 2070 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
2071 | goto brd_input; |
2072 | ||
2073 | /* Accept zero addresses only to limited broadcast; | |
2074 | * I even do not know to fix it or not. Waiting for complains :-) | |
2075 | */ | |
f97c1e0c | 2076 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2077 | goto martian_source; |
2078 | ||
d0daebc3 | 2079 | if (ipv4_is_zeronet(daddr)) |
1da177e4 LT |
2080 | goto martian_destination; |
2081 | ||
9eb43e76 ED |
2082 | /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), |
2083 | * and call it once if daddr or/and saddr are loopback addresses | |
2084 | */ | |
2085 | if (ipv4_is_loopback(daddr)) { | |
2086 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 | 2087 | goto martian_destination; |
9eb43e76 ED |
2088 | } else if (ipv4_is_loopback(saddr)) { |
2089 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 TG |
2090 | goto martian_source; |
2091 | } | |
2092 | ||
1da177e4 LT |
2093 | /* |
2094 | * Now we are ready to route packet. | |
2095 | */ | |
68a5e3dd | 2096 | fl4.flowi4_oif = 0; |
e0d56fdd | 2097 | fl4.flowi4_iif = dev->ifindex; |
68a5e3dd DM |
2098 | fl4.flowi4_mark = skb->mark; |
2099 | fl4.flowi4_tos = tos; | |
2100 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
b84f7878 | 2101 | fl4.flowi4_flags = 0; |
68a5e3dd DM |
2102 | fl4.daddr = daddr; |
2103 | fl4.saddr = saddr; | |
8bcfd092 | 2104 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
e37b1e97 | 2105 | |
5a847a6e | 2106 | if (fib4_rules_early_flow_dissect(net, skb, &fl4, &_flkeys)) { |
e37b1e97 | 2107 | flkeys = &_flkeys; |
5a847a6e DA |
2108 | } else { |
2109 | fl4.flowi4_proto = 0; | |
2110 | fl4.fl4_sport = 0; | |
2111 | fl4.fl4_dport = 0; | |
2112 | } | |
e37b1e97 | 2113 | |
5510cdf7 | 2114 | err = fib_lookup(net, &fl4, res, 0); |
cd0f0b95 DJ |
2115 | if (err != 0) { |
2116 | if (!IN_DEV_FORWARD(in_dev)) | |
2117 | err = -EHOSTUNREACH; | |
1da177e4 | 2118 | goto no_route; |
cd0f0b95 | 2119 | } |
1da177e4 | 2120 | |
5cbf777c XL |
2121 | if (res->type == RTN_BROADCAST) { |
2122 | if (IN_DEV_BFORWARD(in_dev)) | |
2123 | goto make_route; | |
0a90478b XL |
2124 | /* not do cache if bc_forwarding is enabled */ |
2125 | if (IPV4_DEVCONF_ALL(net, BC_FORWARDING)) | |
2126 | do_cache = false; | |
1da177e4 | 2127 | goto brd_input; |
5cbf777c | 2128 | } |
1da177e4 | 2129 | |
5510cdf7 | 2130 | if (res->type == RTN_LOCAL) { |
5c04c819 | 2131 | err = fib_validate_source(skb, saddr, daddr, tos, |
0d5edc68 | 2132 | 0, dev, in_dev, &itag); |
b5f7e755 | 2133 | if (err < 0) |
0d753960 | 2134 | goto martian_source; |
1da177e4 LT |
2135 | goto local_input; |
2136 | } | |
2137 | ||
cd0f0b95 DJ |
2138 | if (!IN_DEV_FORWARD(in_dev)) { |
2139 | err = -EHOSTUNREACH; | |
251da413 | 2140 | goto no_route; |
cd0f0b95 | 2141 | } |
5510cdf7 | 2142 | if (res->type != RTN_UNICAST) |
1da177e4 LT |
2143 | goto martian_destination; |
2144 | ||
5cbf777c | 2145 | make_route: |
e37b1e97 | 2146 | err = ip_mkroute_input(skb, res, in_dev, daddr, saddr, tos, flkeys); |
1da177e4 LT |
2147 | out: return err; |
2148 | ||
2149 | brd_input: | |
2150 | if (skb->protocol != htons(ETH_P_IP)) | |
2151 | goto e_inval; | |
2152 | ||
41347dcd | 2153 | if (!ipv4_is_zeronet(saddr)) { |
9e56e380 DM |
2154 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
2155 | in_dev, &itag); | |
1da177e4 | 2156 | if (err < 0) |
0d753960 | 2157 | goto martian_source; |
1da177e4 LT |
2158 | } |
2159 | flags |= RTCF_BROADCAST; | |
5510cdf7 | 2160 | res->type = RTN_BROADCAST; |
1da177e4 LT |
2161 | RT_CACHE_STAT_INC(in_brd); |
2162 | ||
2163 | local_input: | |
0a90478b XL |
2164 | do_cache &= res->fi && !itag; |
2165 | if (do_cache) { | |
2166 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); | |
eba618ab | 2167 | |
0a90478b XL |
2168 | rth = rcu_dereference(nhc->nhc_rth_input); |
2169 | if (rt_cache_valid(rth)) { | |
2170 | skb_dst_set_noref(skb, &rth->dst); | |
2171 | err = 0; | |
2172 | goto out; | |
d2d68ba9 DM |
2173 | } |
2174 | } | |
2175 | ||
f5a0aab8 | 2176 | rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev, |
5510cdf7 | 2177 | flags | RTCF_LOCAL, res->type, |
d2d68ba9 | 2178 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); |
1da177e4 LT |
2179 | if (!rth) |
2180 | goto e_nobufs; | |
2181 | ||
d8d1f30b | 2182 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
2183 | #ifdef CONFIG_IP_ROUTE_CLASSID |
2184 | rth->dst.tclassid = itag; | |
2185 | #endif | |
9917e1e8 | 2186 | rth->rt_is_input = 1; |
571e7226 | 2187 | |
a6254864 | 2188 | RT_CACHE_STAT_INC(in_slow_tot); |
5510cdf7 | 2189 | if (res->type == RTN_UNREACHABLE) { |
d8d1f30b CG |
2190 | rth->dst.input= ip_error; |
2191 | rth->dst.error= -err; | |
1da177e4 LT |
2192 | rth->rt_flags &= ~RTCF_LOCAL; |
2193 | } | |
efd85700 | 2194 | |
dcdfdf56 | 2195 | if (do_cache) { |
eba618ab | 2196 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
efd85700 | 2197 | |
eba618ab | 2198 | rth->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate); |
efd85700 TG |
2199 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { |
2200 | WARN_ON(rth->dst.input == lwtunnel_input); | |
2201 | rth->dst.lwtstate->orig_input = rth->dst.input; | |
2202 | rth->dst.input = lwtunnel_input; | |
2203 | } | |
2204 | ||
87063a1f | 2205 | if (unlikely(!rt_cache_route(nhc, rth))) |
dcdfdf56 | 2206 | rt_add_uncached_list(rth); |
dcdfdf56 | 2207 | } |
89aef892 | 2208 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 2209 | err = 0; |
ebc0ffae | 2210 | goto out; |
1da177e4 LT |
2211 | |
2212 | no_route: | |
2213 | RT_CACHE_STAT_INC(in_no_route); | |
5510cdf7 DA |
2214 | res->type = RTN_UNREACHABLE; |
2215 | res->fi = NULL; | |
2216 | res->table = NULL; | |
1da177e4 LT |
2217 | goto local_input; |
2218 | ||
2219 | /* | |
2220 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2221 | */ | |
2222 | martian_destination: | |
2223 | RT_CACHE_STAT_INC(in_martian_dst); | |
2224 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
e87cc472 JP |
2225 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
2226 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", | |
2227 | &daddr, &saddr, dev->name); | |
1da177e4 | 2228 | #endif |
2c2910a4 | 2229 | |
1da177e4 LT |
2230 | e_inval: |
2231 | err = -EINVAL; | |
ebc0ffae | 2232 | goto out; |
1da177e4 LT |
2233 | |
2234 | e_nobufs: | |
2235 | err = -ENOBUFS; | |
ebc0ffae | 2236 | goto out; |
1da177e4 LT |
2237 | |
2238 | martian_source: | |
2239 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
ebc0ffae | 2240 | goto out; |
1da177e4 LT |
2241 | } |
2242 | ||
c6cffba4 DM |
2243 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
2244 | u8 tos, struct net_device *dev) | |
1da177e4 | 2245 | { |
5510cdf7 DA |
2246 | struct fib_result res; |
2247 | int err; | |
1da177e4 | 2248 | |
6e28099d | 2249 | tos &= IPTOS_RT_MASK; |
96d36220 | 2250 | rcu_read_lock(); |
5510cdf7 DA |
2251 | err = ip_route_input_rcu(skb, daddr, saddr, tos, dev, &res); |
2252 | rcu_read_unlock(); | |
96d36220 | 2253 | |
5510cdf7 DA |
2254 | return err; |
2255 | } | |
2256 | EXPORT_SYMBOL(ip_route_input_noref); | |
2257 | ||
2258 | /* called with rcu_read_lock held */ | |
2259 | int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
2260 | u8 tos, struct net_device *dev, struct fib_result *res) | |
2261 | { | |
1da177e4 LT |
2262 | /* Multicast recognition logic is moved from route cache to here. |
2263 | The problem was that too many Ethernet cards have broken/missing | |
2264 | hardware multicast filters :-( As result the host on multicasting | |
2265 | network acquires a lot of useless route cache entries, sort of | |
2266 | SDR messages from all the world. Now we try to get rid of them. | |
2267 | Really, provided software IP multicast filter is organized | |
2268 | reasonably (at least, hashed), it does not result in a slowdown | |
2269 | comparing with route cache reject entries. | |
2270 | Note, that multicast routers are not affected, because | |
2271 | route cache entry is created eventually. | |
2272 | */ | |
f97c1e0c | 2273 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 2274 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
e58e4159 | 2275 | int our = 0; |
5510cdf7 | 2276 | int err = -EINVAL; |
1da177e4 | 2277 | |
22c74764 PA |
2278 | if (!in_dev) |
2279 | return err; | |
2280 | our = ip_check_mc_rcu(in_dev, daddr, saddr, | |
2281 | ip_hdr(skb)->protocol); | |
e58e4159 DA |
2282 | |
2283 | /* check l3 master if no match yet */ | |
22c74764 | 2284 | if (!our && netif_is_l3_slave(dev)) { |
e58e4159 DA |
2285 | struct in_device *l3_in_dev; |
2286 | ||
2287 | l3_in_dev = __in_dev_get_rcu(skb->dev); | |
2288 | if (l3_in_dev) | |
2289 | our = ip_check_mc_rcu(l3_in_dev, daddr, saddr, | |
2290 | ip_hdr(skb)->protocol); | |
2291 | } | |
2292 | ||
e58e4159 | 2293 | if (our |
1da177e4 | 2294 | #ifdef CONFIG_IP_MROUTE |
e58e4159 DA |
2295 | || |
2296 | (!ipv4_is_local_multicast(daddr) && | |
2297 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 2298 | #endif |
e58e4159 | 2299 | ) { |
5510cdf7 | 2300 | err = ip_route_input_mc(skb, daddr, saddr, |
e58e4159 | 2301 | tos, dev, our); |
1da177e4 | 2302 | } |
5510cdf7 | 2303 | return err; |
1da177e4 | 2304 | } |
5510cdf7 DA |
2305 | |
2306 | return ip_route_input_slow(skb, daddr, saddr, tos, dev, res); | |
1da177e4 LT |
2307 | } |
2308 | ||
ebc0ffae | 2309 | /* called with rcu_read_lock() */ |
982721f3 | 2310 | static struct rtable *__mkroute_output(const struct fib_result *res, |
1a00fee4 | 2311 | const struct flowi4 *fl4, int orig_oif, |
f61759e6 | 2312 | struct net_device *dev_out, |
5ada5527 | 2313 | unsigned int flags) |
1da177e4 | 2314 | { |
982721f3 | 2315 | struct fib_info *fi = res->fi; |
f2bb4bed | 2316 | struct fib_nh_exception *fnhe; |
5ada5527 | 2317 | struct in_device *in_dev; |
982721f3 | 2318 | u16 type = res->type; |
5ada5527 | 2319 | struct rtable *rth; |
c92b9655 | 2320 | bool do_cache; |
1da177e4 | 2321 | |
d0daebc3 TG |
2322 | in_dev = __in_dev_get_rcu(dev_out); |
2323 | if (!in_dev) | |
5ada5527 | 2324 | return ERR_PTR(-EINVAL); |
1da177e4 | 2325 | |
d0daebc3 | 2326 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
5f02ce24 DA |
2327 | if (ipv4_is_loopback(fl4->saddr) && |
2328 | !(dev_out->flags & IFF_LOOPBACK) && | |
2329 | !netif_is_l3_master(dev_out)) | |
d0daebc3 TG |
2330 | return ERR_PTR(-EINVAL); |
2331 | ||
68a5e3dd | 2332 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 2333 | type = RTN_BROADCAST; |
68a5e3dd | 2334 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 2335 | type = RTN_MULTICAST; |
68a5e3dd | 2336 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 2337 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
2338 | |
2339 | if (dev_out->flags & IFF_LOOPBACK) | |
2340 | flags |= RTCF_LOCAL; | |
2341 | ||
63617421 | 2342 | do_cache = true; |
982721f3 | 2343 | if (type == RTN_BROADCAST) { |
1da177e4 | 2344 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
2345 | fi = NULL; |
2346 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 2347 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
2348 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
2349 | fl4->flowi4_proto)) | |
1da177e4 | 2350 | flags &= ~RTCF_LOCAL; |
63617421 JA |
2351 | else |
2352 | do_cache = false; | |
1da177e4 | 2353 | /* If multicast route do not exist use |
dd28d1a0 ED |
2354 | * default one, but do not gateway in this case. |
2355 | * Yes, it is hack. | |
1da177e4 | 2356 | */ |
982721f3 DM |
2357 | if (fi && res->prefixlen < 4) |
2358 | fi = NULL; | |
d6d5e999 CF |
2359 | } else if ((type == RTN_LOCAL) && (orig_oif != 0) && |
2360 | (orig_oif != dev_out->ifindex)) { | |
2361 | /* For local routes that require a particular output interface | |
2362 | * we do not want to cache the result. Caching the result | |
2363 | * causes incorrect behaviour when there are multiple source | |
2364 | * addresses on the interface, the end result being that if the | |
2365 | * intended recipient is waiting on that interface for the | |
2366 | * packet he won't receive it because it will be delivered on | |
2367 | * the loopback interface and the IP_PKTINFO ipi_ifindex will | |
2368 | * be set to the loopback interface as well. | |
2369 | */ | |
94720e3a | 2370 | do_cache = false; |
1da177e4 LT |
2371 | } |
2372 | ||
f2bb4bed | 2373 | fnhe = NULL; |
63617421 | 2374 | do_cache &= fi != NULL; |
94720e3a | 2375 | if (fi) { |
eba618ab | 2376 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
c5038a83 | 2377 | struct rtable __rcu **prth; |
d26b3a7c | 2378 | |
a5995e71 | 2379 | fnhe = find_exception(nhc, fl4->daddr); |
94720e3a JA |
2380 | if (!do_cache) |
2381 | goto add; | |
deed49df | 2382 | if (fnhe) { |
2ffae99d | 2383 | prth = &fnhe->fnhe_rth_output; |
94720e3a JA |
2384 | } else { |
2385 | if (unlikely(fl4->flowi4_flags & | |
2386 | FLOWI_FLAG_KNOWN_NH && | |
bdf00467 | 2387 | !(nhc->nhc_gw_family && |
eba618ab | 2388 | nhc->nhc_scope == RT_SCOPE_LINK))) { |
94720e3a JA |
2389 | do_cache = false; |
2390 | goto add; | |
c92b9655 | 2391 | } |
0f457a36 | 2392 | prth = raw_cpu_ptr(nhc->nhc_pcpu_rth_output); |
c92b9655 | 2393 | } |
c5038a83 | 2394 | rth = rcu_dereference(*prth); |
9df16efa | 2395 | if (rt_cache_valid(rth) && dst_hold_safe(&rth->dst)) |
c5038a83 | 2396 | return rth; |
f2bb4bed | 2397 | } |
c92b9655 JA |
2398 | |
2399 | add: | |
d08c4f35 | 2400 | rth = rt_dst_alloc(dev_out, flags, type, |
5c1e6aa3 | 2401 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
f2bb4bed | 2402 | IN_DEV_CONF_GET(in_dev, NOXFRM), |
c92b9655 | 2403 | do_cache); |
8391d07b | 2404 | if (!rth) |
5ada5527 | 2405 | return ERR_PTR(-ENOBUFS); |
8391d07b | 2406 | |
9438c871 | 2407 | rth->rt_iif = orig_oif; |
b7503e0c | 2408 | |
1da177e4 LT |
2409 | RT_CACHE_STAT_INC(out_slow_tot); |
2410 | ||
1da177e4 | 2411 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
e905a9ed | 2412 | if (flags & RTCF_LOCAL && |
1da177e4 | 2413 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 2414 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
2415 | RT_CACHE_STAT_INC(out_slow_mc); |
2416 | } | |
2417 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 2418 | if (type == RTN_MULTICAST) { |
1da177e4 | 2419 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 2420 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
2421 | rth->dst.input = ip_mr_input; |
2422 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
2423 | } |
2424 | } | |
2425 | #endif | |
2426 | } | |
2427 | ||
a4c2fd7f | 2428 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0, do_cache); |
9942895b | 2429 | lwtunnel_set_redirect(&rth->dst); |
1da177e4 | 2430 | |
5ada5527 | 2431 | return rth; |
1da177e4 LT |
2432 | } |
2433 | ||
1da177e4 LT |
2434 | /* |
2435 | * Major route resolver routine. | |
2436 | */ | |
2437 | ||
3abd1ade DA |
2438 | struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *fl4, |
2439 | const struct sk_buff *skb) | |
1da177e4 | 2440 | { |
f61759e6 | 2441 | __u8 tos = RT_FL_TOS(fl4); |
d0ea2b12 ED |
2442 | struct fib_result res = { |
2443 | .type = RTN_UNSPEC, | |
2444 | .fi = NULL, | |
2445 | .table = NULL, | |
2446 | .tclassid = 0, | |
2447 | }; | |
5ada5527 | 2448 | struct rtable *rth; |
1da177e4 | 2449 | |
1fb9489b | 2450 | fl4->flowi4_iif = LOOPBACK_IFINDEX; |
813b3b5d DM |
2451 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
2452 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
2453 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
44713b67 | 2454 | |
010c2708 | 2455 | rcu_read_lock(); |
3abd1ade DA |
2456 | rth = ip_route_output_key_hash_rcu(net, fl4, &res, skb); |
2457 | rcu_read_unlock(); | |
2458 | ||
2459 | return rth; | |
2460 | } | |
2461 | EXPORT_SYMBOL_GPL(ip_route_output_key_hash); | |
2462 | ||
2463 | struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *fl4, | |
2464 | struct fib_result *res, | |
2465 | const struct sk_buff *skb) | |
2466 | { | |
2467 | struct net_device *dev_out = NULL; | |
2468 | int orig_oif = fl4->flowi4_oif; | |
2469 | unsigned int flags = 0; | |
2470 | struct rtable *rth; | |
2471 | int err = -ENETUNREACH; | |
2472 | ||
813b3b5d | 2473 | if (fl4->saddr) { |
b23dd4fe | 2474 | rth = ERR_PTR(-EINVAL); |
813b3b5d DM |
2475 | if (ipv4_is_multicast(fl4->saddr) || |
2476 | ipv4_is_lbcast(fl4->saddr) || | |
2477 | ipv4_is_zeronet(fl4->saddr)) | |
1da177e4 LT |
2478 | goto out; |
2479 | ||
1da177e4 LT |
2480 | /* I removed check for oif == dev_out->oif here. |
2481 | It was wrong for two reasons: | |
1ab35276 DL |
2482 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2483 | is assigned to multiple interfaces. | |
1da177e4 LT |
2484 | 2. Moreover, we are allowed to send packets with saddr |
2485 | of another iface. --ANK | |
2486 | */ | |
2487 | ||
813b3b5d DM |
2488 | if (fl4->flowi4_oif == 0 && |
2489 | (ipv4_is_multicast(fl4->daddr) || | |
2490 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 2491 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2492 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
51456b29 | 2493 | if (!dev_out) |
a210d01a JA |
2494 | goto out; |
2495 | ||
1da177e4 LT |
2496 | /* Special hack: user can direct multicasts |
2497 | and limited broadcast via necessary interface | |
2498 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2499 | This hack is not just for fun, it allows | |
2500 | vic,vat and friends to work. | |
2501 | They bind socket to loopback, set ttl to zero | |
2502 | and expect that it will work. | |
2503 | From the viewpoint of routing cache they are broken, | |
2504 | because we are not allowed to build multicast path | |
2505 | with loopback source addr (look, routing cache | |
2506 | cannot know, that ttl is zero, so that packet | |
2507 | will not leave this host and route is valid). | |
2508 | Luckily, this hack is good workaround. | |
2509 | */ | |
2510 | ||
813b3b5d | 2511 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2512 | goto make_route; |
2513 | } | |
a210d01a | 2514 | |
813b3b5d | 2515 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 2516 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2517 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 2518 | goto out; |
a210d01a | 2519 | } |
1da177e4 LT |
2520 | } |
2521 | ||
2522 | ||
813b3b5d DM |
2523 | if (fl4->flowi4_oif) { |
2524 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 2525 | rth = ERR_PTR(-ENODEV); |
51456b29 | 2526 | if (!dev_out) |
1da177e4 | 2527 | goto out; |
e5ed6399 HX |
2528 | |
2529 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 2530 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 2531 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
2532 | goto out; |
2533 | } | |
813b3b5d | 2534 | if (ipv4_is_local_multicast(fl4->daddr) || |
6a211654 AL |
2535 | ipv4_is_lbcast(fl4->daddr) || |
2536 | fl4->flowi4_proto == IPPROTO_IGMP) { | |
813b3b5d DM |
2537 | if (!fl4->saddr) |
2538 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2539 | RT_SCOPE_LINK); | |
1da177e4 LT |
2540 | goto make_route; |
2541 | } | |
0a7e2260 | 2542 | if (!fl4->saddr) { |
813b3b5d DM |
2543 | if (ipv4_is_multicast(fl4->daddr)) |
2544 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2545 | fl4->flowi4_scope); | |
2546 | else if (!fl4->daddr) | |
2547 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2548 | RT_SCOPE_HOST); | |
1da177e4 LT |
2549 | } |
2550 | } | |
2551 | ||
813b3b5d DM |
2552 | if (!fl4->daddr) { |
2553 | fl4->daddr = fl4->saddr; | |
2554 | if (!fl4->daddr) | |
2555 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 2556 | dev_out = net->loopback_dev; |
1fb9489b | 2557 | fl4->flowi4_oif = LOOPBACK_IFINDEX; |
3abd1ade | 2558 | res->type = RTN_LOCAL; |
1da177e4 LT |
2559 | flags |= RTCF_LOCAL; |
2560 | goto make_route; | |
2561 | } | |
2562 | ||
3abd1ade | 2563 | err = fib_lookup(net, fl4, res, 0); |
0315e382 | 2564 | if (err) { |
3abd1ade DA |
2565 | res->fi = NULL; |
2566 | res->table = NULL; | |
6104e112 | 2567 | if (fl4->flowi4_oif && |
e58e4159 DA |
2568 | (ipv4_is_multicast(fl4->daddr) || |
2569 | !netif_index_is_l3_master(net, fl4->flowi4_oif))) { | |
1da177e4 LT |
2570 | /* Apparently, routing tables are wrong. Assume, |
2571 | that the destination is on link. | |
2572 | ||
2573 | WHY? DW. | |
2574 | Because we are allowed to send to iface | |
2575 | even if it has NO routes and NO assigned | |
2576 | addresses. When oif is specified, routing | |
2577 | tables are looked up with only one purpose: | |
2578 | to catch if destination is gatewayed, rather than | |
2579 | direct. Moreover, if MSG_DONTROUTE is set, | |
2580 | we send packet, ignoring both routing tables | |
2581 | and ifaddr state. --ANK | |
2582 | ||
2583 | ||
2584 | We could make it even if oif is unknown, | |
2585 | likely IPv6, but we do not. | |
2586 | */ | |
2587 | ||
813b3b5d DM |
2588 | if (fl4->saddr == 0) |
2589 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2590 | RT_SCOPE_LINK); | |
3abd1ade | 2591 | res->type = RTN_UNICAST; |
1da177e4 LT |
2592 | goto make_route; |
2593 | } | |
0315e382 | 2594 | rth = ERR_PTR(err); |
1da177e4 LT |
2595 | goto out; |
2596 | } | |
1da177e4 | 2597 | |
3abd1ade | 2598 | if (res->type == RTN_LOCAL) { |
813b3b5d | 2599 | if (!fl4->saddr) { |
3abd1ade DA |
2600 | if (res->fi->fib_prefsrc) |
2601 | fl4->saddr = res->fi->fib_prefsrc; | |
9fc3bbb4 | 2602 | else |
813b3b5d | 2603 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 2604 | } |
5f02ce24 DA |
2605 | |
2606 | /* L3 master device is the loopback for that domain */ | |
3abd1ade | 2607 | dev_out = l3mdev_master_dev_rcu(FIB_RES_DEV(*res)) ? : |
b7c8487c | 2608 | net->loopback_dev; |
839da4d9 DA |
2609 | |
2610 | /* make sure orig_oif points to fib result device even | |
2611 | * though packet rx/tx happens over loopback or l3mdev | |
2612 | */ | |
2613 | orig_oif = FIB_RES_OIF(*res); | |
2614 | ||
813b3b5d | 2615 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2616 | flags |= RTCF_LOCAL; |
2617 | goto make_route; | |
2618 | } | |
2619 | ||
3abd1ade | 2620 | fib_select_path(net, res, fl4, skb); |
1da177e4 | 2621 | |
3abd1ade | 2622 | dev_out = FIB_RES_DEV(*res); |
813b3b5d | 2623 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2624 | |
2625 | ||
2626 | make_route: | |
3abd1ade | 2627 | rth = __mkroute_output(res, fl4, orig_oif, dev_out, flags); |
1da177e4 | 2628 | |
010c2708 | 2629 | out: |
b23dd4fe | 2630 | return rth; |
1da177e4 | 2631 | } |
d8c97a94 | 2632 | |
ae2688d5 JW |
2633 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
2634 | { | |
2635 | return NULL; | |
2636 | } | |
2637 | ||
ebb762f2 | 2638 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 2639 | { |
618f9bc7 SK |
2640 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2641 | ||
2642 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
2643 | } |
2644 | ||
6700c270 DM |
2645 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2646 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
2647 | { |
2648 | } | |
2649 | ||
6700c270 DM |
2650 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
2651 | struct sk_buff *skb) | |
b587ee3b DM |
2652 | { |
2653 | } | |
2654 | ||
0972ddb2 HB |
2655 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
2656 | unsigned long old) | |
2657 | { | |
2658 | return NULL; | |
2659 | } | |
2660 | ||
14e50e57 DM |
2661 | static struct dst_ops ipv4_dst_blackhole_ops = { |
2662 | .family = AF_INET, | |
ae2688d5 | 2663 | .check = ipv4_blackhole_dst_check, |
ebb762f2 | 2664 | .mtu = ipv4_blackhole_mtu, |
214f45c9 | 2665 | .default_advmss = ipv4_default_advmss, |
14e50e57 | 2666 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
b587ee3b | 2667 | .redirect = ipv4_rt_blackhole_redirect, |
0972ddb2 | 2668 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
d3aaeb38 | 2669 | .neigh_lookup = ipv4_neigh_lookup, |
14e50e57 DM |
2670 | }; |
2671 | ||
2774c131 | 2672 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2673 | { |
2774c131 | 2674 | struct rtable *ort = (struct rtable *) dst_orig; |
f5b0a874 | 2675 | struct rtable *rt; |
14e50e57 | 2676 | |
6c0e7284 | 2677 | rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2678 | if (rt) { |
d8d1f30b | 2679 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2680 | |
14e50e57 | 2681 | new->__use = 1; |
352e512c | 2682 | new->input = dst_discard; |
ede2059d | 2683 | new->output = dst_discard_out; |
14e50e57 | 2684 | |
1dbe3252 | 2685 | new->dev = net->loopback_dev; |
14e50e57 DM |
2686 | if (new->dev) |
2687 | dev_hold(new->dev); | |
2688 | ||
9917e1e8 | 2689 | rt->rt_is_input = ort->rt_is_input; |
5e2b61f7 | 2690 | rt->rt_iif = ort->rt_iif; |
5943634f | 2691 | rt->rt_pmtu = ort->rt_pmtu; |
d52e5a7e | 2692 | rt->rt_mtu_locked = ort->rt_mtu_locked; |
14e50e57 | 2693 | |
ca4c3fc2 | 2694 | rt->rt_genid = rt_genid_ipv4(net); |
14e50e57 DM |
2695 | rt->rt_flags = ort->rt_flags; |
2696 | rt->rt_type = ort->rt_type; | |
1550c171 DA |
2697 | rt->rt_gw_family = ort->rt_gw_family; |
2698 | if (rt->rt_gw_family == AF_INET) | |
2699 | rt->rt_gw4 = ort->rt_gw4; | |
0f5f7d7b DA |
2700 | else if (rt->rt_gw_family == AF_INET6) |
2701 | rt->rt_gw6 = ort->rt_gw6; | |
14e50e57 | 2702 | |
caacf05e | 2703 | INIT_LIST_HEAD(&rt->rt_uncached); |
14e50e57 DM |
2704 | } |
2705 | ||
2774c131 DM |
2706 | dst_release(dst_orig); |
2707 | ||
2708 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2709 | } |
2710 | ||
9d6ec938 | 2711 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
6f9c9615 | 2712 | const struct sock *sk) |
1da177e4 | 2713 | { |
9d6ec938 | 2714 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2715 | |
b23dd4fe DM |
2716 | if (IS_ERR(rt)) |
2717 | return rt; | |
1da177e4 | 2718 | |
56157872 | 2719 | if (flp4->flowi4_proto) |
f92ee619 SK |
2720 | rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst, |
2721 | flowi4_to_flowi(flp4), | |
2722 | sk, 0); | |
1da177e4 | 2723 | |
b23dd4fe | 2724 | return rt; |
1da177e4 | 2725 | } |
d8c97a94 ACM |
2726 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2727 | ||
3765d35e | 2728 | /* called with rcu_read_lock held */ |
404eb77e RP |
2729 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, |
2730 | struct rtable *rt, u32 table_id, struct flowi4 *fl4, | |
e93fb3e9 JF |
2731 | struct sk_buff *skb, u32 portid, u32 seq, |
2732 | unsigned int flags) | |
1da177e4 | 2733 | { |
1da177e4 | 2734 | struct rtmsg *r; |
be403ea1 | 2735 | struct nlmsghdr *nlh; |
2bc8ca40 | 2736 | unsigned long expires = 0; |
f185071d | 2737 | u32 error; |
521f5490 | 2738 | u32 metrics[RTAX_MAX]; |
be403ea1 | 2739 | |
e93fb3e9 | 2740 | nlh = nlmsg_put(skb, portid, seq, RTM_NEWROUTE, sizeof(*r), flags); |
51456b29 | 2741 | if (!nlh) |
26932566 | 2742 | return -EMSGSIZE; |
be403ea1 TG |
2743 | |
2744 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2745 | r->rtm_family = AF_INET; |
2746 | r->rtm_dst_len = 32; | |
2747 | r->rtm_src_len = 0; | |
d948974c | 2748 | r->rtm_tos = fl4 ? fl4->flowi4_tos : 0; |
8a430ed5 | 2749 | r->rtm_table = table_id < 256 ? table_id : RT_TABLE_COMPAT; |
c36ba660 | 2750 | if (nla_put_u32(skb, RTA_TABLE, table_id)) |
f3756b79 | 2751 | goto nla_put_failure; |
1da177e4 LT |
2752 | r->rtm_type = rt->rt_type; |
2753 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2754 | r->rtm_protocol = RTPROT_UNSPEC; | |
2755 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2756 | if (rt->rt_flags & RTCF_NOTIFY) | |
2757 | r->rtm_flags |= RTM_F_NOTIFY; | |
df4d9254 HFS |
2758 | if (IPCB(skb)->flags & IPSKB_DOREDIRECT) |
2759 | r->rtm_flags |= RTCF_DOREDIRECT; | |
be403ea1 | 2760 | |
930345ea | 2761 | if (nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 | 2762 | goto nla_put_failure; |
1a00fee4 | 2763 | if (src) { |
1da177e4 | 2764 | r->rtm_src_len = 32; |
930345ea | 2765 | if (nla_put_in_addr(skb, RTA_SRC, src)) |
f3756b79 | 2766 | goto nla_put_failure; |
1da177e4 | 2767 | } |
f3756b79 DM |
2768 | if (rt->dst.dev && |
2769 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2770 | goto nla_put_failure; | |
c7066f70 | 2771 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
2772 | if (rt->dst.tclassid && |
2773 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) | |
2774 | goto nla_put_failure; | |
1da177e4 | 2775 | #endif |
d948974c | 2776 | if (fl4 && !rt_is_input_route(rt) && |
d6c0a4f6 | 2777 | fl4->saddr != src) { |
930345ea | 2778 | if (nla_put_in_addr(skb, RTA_PREFSRC, fl4->saddr)) |
f3756b79 DM |
2779 | goto nla_put_failure; |
2780 | } | |
1550c171 | 2781 | if (rt->rt_gw_family == AF_INET && |
0f5f7d7b | 2782 | nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gw4)) { |
f3756b79 | 2783 | goto nla_put_failure; |
0f5f7d7b DA |
2784 | } else if (rt->rt_gw_family == AF_INET6) { |
2785 | int alen = sizeof(struct in6_addr); | |
2786 | struct nlattr *nla; | |
2787 | struct rtvia *via; | |
2788 | ||
2789 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
2790 | if (!nla) | |
2791 | goto nla_put_failure; | |
2792 | ||
2793 | via = nla_data(nla); | |
2794 | via->rtvia_family = AF_INET6; | |
2795 | memcpy(via->rtvia_addr, &rt->rt_gw6, alen); | |
2796 | } | |
be403ea1 | 2797 | |
ee9a8f7a SK |
2798 | expires = rt->dst.expires; |
2799 | if (expires) { | |
2800 | unsigned long now = jiffies; | |
2801 | ||
2802 | if (time_before(now, expires)) | |
2803 | expires -= now; | |
2804 | else | |
2805 | expires = 0; | |
2806 | } | |
2807 | ||
521f5490 | 2808 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
ee9a8f7a | 2809 | if (rt->rt_pmtu && expires) |
521f5490 | 2810 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
d52e5a7e SD |
2811 | if (rt->rt_mtu_locked && expires) |
2812 | metrics[RTAX_LOCK - 1] |= BIT(RTAX_MTU); | |
521f5490 | 2813 | if (rtnetlink_put_metrics(skb, metrics) < 0) |
be403ea1 TG |
2814 | goto nla_put_failure; |
2815 | ||
d948974c SB |
2816 | if (fl4) { |
2817 | if (fl4->flowi4_mark && | |
2818 | nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark)) | |
2819 | goto nla_put_failure; | |
622ec2c9 | 2820 | |
d948974c SB |
2821 | if (!uid_eq(fl4->flowi4_uid, INVALID_UID) && |
2822 | nla_put_u32(skb, RTA_UID, | |
2823 | from_kuid_munged(current_user_ns(), | |
2824 | fl4->flowi4_uid))) | |
2825 | goto nla_put_failure; | |
be403ea1 | 2826 | |
d948974c | 2827 | if (rt_is_input_route(rt)) { |
8caaf7b6 | 2828 | #ifdef CONFIG_IP_MROUTE |
d948974c SB |
2829 | if (ipv4_is_multicast(dst) && |
2830 | !ipv4_is_local_multicast(dst) && | |
2831 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { | |
2832 | int err = ipmr_get_route(net, skb, | |
2833 | fl4->saddr, fl4->daddr, | |
2834 | r, portid); | |
2835 | ||
2836 | if (err <= 0) { | |
2837 | if (err == 0) | |
2838 | return 0; | |
2839 | goto nla_put_failure; | |
2840 | } | |
2841 | } else | |
8caaf7b6 | 2842 | #endif |
d948974c SB |
2843 | if (nla_put_u32(skb, RTA_IIF, fl4->flowi4_iif)) |
2844 | goto nla_put_failure; | |
2845 | } | |
1da177e4 LT |
2846 | } |
2847 | ||
d948974c SB |
2848 | error = rt->dst.error; |
2849 | ||
f185071d | 2850 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
e3703b3d | 2851 | goto nla_put_failure; |
be403ea1 | 2852 | |
053c095a JB |
2853 | nlmsg_end(skb, nlh); |
2854 | return 0; | |
1da177e4 | 2855 | |
be403ea1 | 2856 | nla_put_failure: |
26932566 PM |
2857 | nlmsg_cancel(skb, nlh); |
2858 | return -EMSGSIZE; | |
1da177e4 LT |
2859 | } |
2860 | ||
ee28906f SB |
2861 | static int fnhe_dump_bucket(struct net *net, struct sk_buff *skb, |
2862 | struct netlink_callback *cb, u32 table_id, | |
2863 | struct fnhe_hash_bucket *bucket, int genid, | |
e93fb3e9 | 2864 | int *fa_index, int fa_start, unsigned int flags) |
ee28906f SB |
2865 | { |
2866 | int i; | |
2867 | ||
2868 | for (i = 0; i < FNHE_HASH_SIZE; i++) { | |
2869 | struct fib_nh_exception *fnhe; | |
2870 | ||
2871 | for (fnhe = rcu_dereference(bucket[i].chain); fnhe; | |
2872 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
2873 | struct rtable *rt; | |
2874 | int err; | |
2875 | ||
2876 | if (*fa_index < fa_start) | |
2877 | goto next; | |
2878 | ||
2879 | if (fnhe->fnhe_genid != genid) | |
2880 | goto next; | |
2881 | ||
2882 | if (fnhe->fnhe_expires && | |
2883 | time_after(jiffies, fnhe->fnhe_expires)) | |
2884 | goto next; | |
2885 | ||
2886 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
2887 | if (!rt) | |
2888 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
2889 | if (!rt) | |
2890 | goto next; | |
2891 | ||
2892 | err = rt_fill_info(net, fnhe->fnhe_daddr, 0, rt, | |
2893 | table_id, NULL, skb, | |
2894 | NETLINK_CB(cb->skb).portid, | |
e93fb3e9 | 2895 | cb->nlh->nlmsg_seq, flags); |
ee28906f SB |
2896 | if (err) |
2897 | return err; | |
2898 | next: | |
2899 | (*fa_index)++; | |
2900 | } | |
2901 | } | |
2902 | ||
2903 | return 0; | |
2904 | } | |
2905 | ||
2906 | int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb, | |
2907 | u32 table_id, struct fib_info *fi, | |
e93fb3e9 | 2908 | int *fa_index, int fa_start, unsigned int flags) |
ee28906f SB |
2909 | { |
2910 | struct net *net = sock_net(cb->skb->sk); | |
2911 | int nhsel, genid = fnhe_genid(net); | |
2912 | ||
2913 | for (nhsel = 0; nhsel < fib_info_num_path(fi); nhsel++) { | |
2914 | struct fib_nh_common *nhc = fib_info_nhc(fi, nhsel); | |
2915 | struct fnhe_hash_bucket *bucket; | |
2916 | int err; | |
2917 | ||
2918 | if (nhc->nhc_flags & RTNH_F_DEAD) | |
2919 | continue; | |
2920 | ||
93ed54b1 | 2921 | rcu_read_lock(); |
ee28906f | 2922 | bucket = rcu_dereference(nhc->nhc_exceptions); |
93ed54b1 ED |
2923 | err = 0; |
2924 | if (bucket) | |
2925 | err = fnhe_dump_bucket(net, skb, cb, table_id, bucket, | |
e93fb3e9 JF |
2926 | genid, fa_index, fa_start, |
2927 | flags); | |
93ed54b1 | 2928 | rcu_read_unlock(); |
ee28906f SB |
2929 | if (err) |
2930 | return err; | |
2931 | } | |
2932 | ||
2933 | return 0; | |
2934 | } | |
2935 | ||
404eb77e RP |
2936 | static struct sk_buff *inet_rtm_getroute_build_skb(__be32 src, __be32 dst, |
2937 | u8 ip_proto, __be16 sport, | |
2938 | __be16 dport) | |
2939 | { | |
2940 | struct sk_buff *skb; | |
2941 | struct iphdr *iph; | |
2942 | ||
2943 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2944 | if (!skb) | |
2945 | return NULL; | |
2946 | ||
2947 | /* Reserve room for dummy headers, this skb can pass | |
2948 | * through good chunk of routing engine. | |
2949 | */ | |
2950 | skb_reset_mac_header(skb); | |
2951 | skb_reset_network_header(skb); | |
2952 | skb->protocol = htons(ETH_P_IP); | |
2953 | iph = skb_put(skb, sizeof(struct iphdr)); | |
2954 | iph->protocol = ip_proto; | |
2955 | iph->saddr = src; | |
2956 | iph->daddr = dst; | |
2957 | iph->version = 0x4; | |
2958 | iph->frag_off = 0; | |
2959 | iph->ihl = 0x5; | |
2960 | skb_set_transport_header(skb, skb->len); | |
2961 | ||
2962 | switch (iph->protocol) { | |
2963 | case IPPROTO_UDP: { | |
2964 | struct udphdr *udph; | |
2965 | ||
2966 | udph = skb_put_zero(skb, sizeof(struct udphdr)); | |
2967 | udph->source = sport; | |
2968 | udph->dest = dport; | |
2969 | udph->len = sizeof(struct udphdr); | |
2970 | udph->check = 0; | |
2971 | break; | |
2972 | } | |
2973 | case IPPROTO_TCP: { | |
2974 | struct tcphdr *tcph; | |
2975 | ||
2976 | tcph = skb_put_zero(skb, sizeof(struct tcphdr)); | |
2977 | tcph->source = sport; | |
2978 | tcph->dest = dport; | |
2979 | tcph->doff = sizeof(struct tcphdr) / 4; | |
2980 | tcph->rst = 1; | |
2981 | tcph->check = ~tcp_v4_check(sizeof(struct tcphdr), | |
2982 | src, dst, 0); | |
2983 | break; | |
2984 | } | |
2985 | case IPPROTO_ICMP: { | |
2986 | struct icmphdr *icmph; | |
2987 | ||
2988 | icmph = skb_put_zero(skb, sizeof(struct icmphdr)); | |
2989 | icmph->type = ICMP_ECHO; | |
2990 | icmph->code = 0; | |
2991 | } | |
2992 | } | |
2993 | ||
2994 | return skb; | |
2995 | } | |
2996 | ||
a00302b6 JK |
2997 | static int inet_rtm_valid_getroute_req(struct sk_buff *skb, |
2998 | const struct nlmsghdr *nlh, | |
2999 | struct nlattr **tb, | |
3000 | struct netlink_ext_ack *extack) | |
3001 | { | |
3002 | struct rtmsg *rtm; | |
3003 | int i, err; | |
3004 | ||
3005 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
3006 | NL_SET_ERR_MSG(extack, | |
3007 | "ipv4: Invalid header for route get request"); | |
3008 | return -EINVAL; | |
3009 | } | |
3010 | ||
3011 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
3012 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
3013 | rtm_ipv4_policy, extack); | |
a00302b6 JK |
3014 | |
3015 | rtm = nlmsg_data(nlh); | |
3016 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) || | |
3017 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) || | |
3018 | rtm->rtm_table || rtm->rtm_protocol || | |
3019 | rtm->rtm_scope || rtm->rtm_type) { | |
3020 | NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for route get request"); | |
3021 | return -EINVAL; | |
3022 | } | |
3023 | ||
3024 | if (rtm->rtm_flags & ~(RTM_F_NOTIFY | | |
3025 | RTM_F_LOOKUP_TABLE | | |
3026 | RTM_F_FIB_MATCH)) { | |
3027 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported rtm_flags for route get request"); | |
3028 | return -EINVAL; | |
3029 | } | |
3030 | ||
8cb08174 JB |
3031 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
3032 | rtm_ipv4_policy, extack); | |
a00302b6 JK |
3033 | if (err) |
3034 | return err; | |
3035 | ||
3036 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
3037 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
3038 | NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4"); | |
3039 | return -EINVAL; | |
3040 | } | |
3041 | ||
3042 | for (i = 0; i <= RTA_MAX; i++) { | |
3043 | if (!tb[i]) | |
3044 | continue; | |
3045 | ||
3046 | switch (i) { | |
3047 | case RTA_IIF: | |
3048 | case RTA_OIF: | |
3049 | case RTA_SRC: | |
3050 | case RTA_DST: | |
3051 | case RTA_IP_PROTO: | |
3052 | case RTA_SPORT: | |
3053 | case RTA_DPORT: | |
3054 | case RTA_MARK: | |
3055 | case RTA_UID: | |
3056 | break; | |
3057 | default: | |
3058 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in route get request"); | |
3059 | return -EINVAL; | |
3060 | } | |
3061 | } | |
3062 | ||
3063 | return 0; | |
3064 | } | |
3065 | ||
c21ef3e3 DA |
3066 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
3067 | struct netlink_ext_ack *extack) | |
1da177e4 | 3068 | { |
3b1e0a65 | 3069 | struct net *net = sock_net(in_skb->sk); |
d889ce3b | 3070 | struct nlattr *tb[RTA_MAX+1]; |
404eb77e RP |
3071 | u32 table_id = RT_TABLE_MAIN; |
3072 | __be16 sport = 0, dport = 0; | |
3765d35e | 3073 | struct fib_result res = {}; |
404eb77e | 3074 | u8 ip_proto = IPPROTO_UDP; |
1da177e4 | 3075 | struct rtable *rt = NULL; |
404eb77e RP |
3076 | struct sk_buff *skb; |
3077 | struct rtmsg *rtm; | |
e8e3fbe9 | 3078 | struct flowi4 fl4 = {}; |
9e12bb22 AV |
3079 | __be32 dst = 0; |
3080 | __be32 src = 0; | |
404eb77e | 3081 | kuid_t uid; |
9e12bb22 | 3082 | u32 iif; |
d889ce3b | 3083 | int err; |
963bfeee | 3084 | int mark; |
1da177e4 | 3085 | |
a00302b6 | 3086 | err = inet_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
d889ce3b | 3087 | if (err < 0) |
404eb77e | 3088 | return err; |
d889ce3b TG |
3089 | |
3090 | rtm = nlmsg_data(nlh); | |
67b61f6c JB |
3091 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
3092 | dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
d889ce3b | 3093 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 3094 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
622ec2c9 LC |
3095 | if (tb[RTA_UID]) |
3096 | uid = make_kuid(current_user_ns(), nla_get_u32(tb[RTA_UID])); | |
3097 | else | |
3098 | uid = (iif ? INVALID_UID : current_uid()); | |
1da177e4 | 3099 | |
404eb77e RP |
3100 | if (tb[RTA_IP_PROTO]) { |
3101 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea | 3102 | &ip_proto, AF_INET, extack); |
404eb77e RP |
3103 | if (err) |
3104 | return err; | |
3105 | } | |
bbadb9a2 | 3106 | |
404eb77e RP |
3107 | if (tb[RTA_SPORT]) |
3108 | sport = nla_get_be16(tb[RTA_SPORT]); | |
bbadb9a2 | 3109 | |
404eb77e RP |
3110 | if (tb[RTA_DPORT]) |
3111 | dport = nla_get_be16(tb[RTA_DPORT]); | |
3112 | ||
3113 | skb = inet_rtm_getroute_build_skb(src, dst, ip_proto, sport, dport); | |
3114 | if (!skb) | |
3115 | return -ENOBUFS; | |
bbadb9a2 | 3116 | |
d6c0a4f6 DM |
3117 | fl4.daddr = dst; |
3118 | fl4.saddr = src; | |
3119 | fl4.flowi4_tos = rtm->rtm_tos; | |
3120 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; | |
3121 | fl4.flowi4_mark = mark; | |
622ec2c9 | 3122 | fl4.flowi4_uid = uid; |
404eb77e RP |
3123 | if (sport) |
3124 | fl4.fl4_sport = sport; | |
3125 | if (dport) | |
3126 | fl4.fl4_dport = dport; | |
3127 | fl4.flowi4_proto = ip_proto; | |
d6c0a4f6 | 3128 | |
3765d35e DA |
3129 | rcu_read_lock(); |
3130 | ||
1da177e4 | 3131 | if (iif) { |
d889ce3b TG |
3132 | struct net_device *dev; |
3133 | ||
3765d35e | 3134 | dev = dev_get_by_index_rcu(net, iif); |
51456b29 | 3135 | if (!dev) { |
d889ce3b | 3136 | err = -ENODEV; |
404eb77e | 3137 | goto errout_rcu; |
d889ce3b TG |
3138 | } |
3139 | ||
404eb77e | 3140 | fl4.flowi4_iif = iif; /* for rt_fill_info */ |
1da177e4 | 3141 | skb->dev = dev; |
963bfeee | 3142 | skb->mark = mark; |
3765d35e DA |
3143 | err = ip_route_input_rcu(skb, dst, src, rtm->rtm_tos, |
3144 | dev, &res); | |
d889ce3b | 3145 | |
511c3f92 | 3146 | rt = skb_rtable(skb); |
d8d1f30b CG |
3147 | if (err == 0 && rt->dst.error) |
3148 | err = -rt->dst.error; | |
1da177e4 | 3149 | } else { |
6503a304 | 3150 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
21f94775 | 3151 | skb->dev = net->loopback_dev; |
3765d35e | 3152 | rt = ip_route_output_key_hash_rcu(net, &fl4, &res, skb); |
b23dd4fe DM |
3153 | err = 0; |
3154 | if (IS_ERR(rt)) | |
3155 | err = PTR_ERR(rt); | |
2c87d63a FW |
3156 | else |
3157 | skb_dst_set(skb, &rt->dst); | |
1da177e4 | 3158 | } |
d889ce3b | 3159 | |
1da177e4 | 3160 | if (err) |
404eb77e | 3161 | goto errout_rcu; |
1da177e4 | 3162 | |
1da177e4 LT |
3163 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
3164 | rt->rt_flags |= RTCF_NOTIFY; | |
3165 | ||
c36ba660 | 3166 | if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE) |
68e813aa | 3167 | table_id = res.table ? res.table->tb_id : 0; |
c36ba660 | 3168 | |
404eb77e RP |
3169 | /* reset skb for netlink reply msg */ |
3170 | skb_trim(skb, 0); | |
3171 | skb_reset_network_header(skb); | |
3172 | skb_reset_transport_header(skb); | |
3173 | skb_reset_mac_header(skb); | |
3174 | ||
bc3aae2b RP |
3175 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { |
3176 | if (!res.fi) { | |
3177 | err = fib_props[res.type].error; | |
3178 | if (!err) | |
3179 | err = -EHOSTUNREACH; | |
404eb77e | 3180 | goto errout_rcu; |
bc3aae2b | 3181 | } |
b6179813 RP |
3182 | err = fib_dump_info(skb, NETLINK_CB(in_skb).portid, |
3183 | nlh->nlmsg_seq, RTM_NEWROUTE, table_id, | |
3184 | rt->rt_type, res.prefix, res.prefixlen, | |
3185 | fl4.flowi4_tos, res.fi, 0); | |
bc3aae2b | 3186 | } else { |
404eb77e | 3187 | err = rt_fill_info(net, dst, src, rt, table_id, &fl4, skb, |
e93fb3e9 JF |
3188 | NETLINK_CB(in_skb).portid, |
3189 | nlh->nlmsg_seq, 0); | |
bc3aae2b | 3190 | } |
7b46a644 | 3191 | if (err < 0) |
404eb77e | 3192 | goto errout_rcu; |
1da177e4 | 3193 | |
3765d35e DA |
3194 | rcu_read_unlock(); |
3195 | ||
15e47304 | 3196 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
1da177e4 | 3197 | |
d889ce3b | 3198 | errout_free: |
404eb77e RP |
3199 | return err; |
3200 | errout_rcu: | |
3765d35e | 3201 | rcu_read_unlock(); |
1da177e4 | 3202 | kfree_skb(skb); |
404eb77e | 3203 | goto errout_free; |
1da177e4 LT |
3204 | } |
3205 | ||
1da177e4 LT |
3206 | void ip_rt_multicast_event(struct in_device *in_dev) |
3207 | { | |
4ccfe6d4 | 3208 | rt_cache_flush(dev_net(in_dev->dev)); |
1da177e4 LT |
3209 | } |
3210 | ||
3211 | #ifdef CONFIG_SYSCTL | |
082c7ca4 G |
3212 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
3213 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
3214 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
773daa3c | 3215 | static int ip_min_valid_pmtu __read_mostly = IPV4_MIN_MTU; |
082c7ca4 | 3216 | |
fe2c6338 | 3217 | static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write, |
8d65af78 | 3218 | void __user *buffer, |
1da177e4 LT |
3219 | size_t *lenp, loff_t *ppos) |
3220 | { | |
5aad1de5 TT |
3221 | struct net *net = (struct net *)__ctl->extra1; |
3222 | ||
1da177e4 | 3223 | if (write) { |
5aad1de5 TT |
3224 | rt_cache_flush(net); |
3225 | fnhe_genid_bump(net); | |
1da177e4 | 3226 | return 0; |
e905a9ed | 3227 | } |
1da177e4 LT |
3228 | |
3229 | return -EINVAL; | |
3230 | } | |
3231 | ||
fe2c6338 | 3232 | static struct ctl_table ipv4_route_table[] = { |
1da177e4 | 3233 | { |
1da177e4 LT |
3234 | .procname = "gc_thresh", |
3235 | .data = &ipv4_dst_ops.gc_thresh, | |
3236 | .maxlen = sizeof(int), | |
3237 | .mode = 0644, | |
6d9f239a | 3238 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3239 | }, |
3240 | { | |
1da177e4 LT |
3241 | .procname = "max_size", |
3242 | .data = &ip_rt_max_size, | |
3243 | .maxlen = sizeof(int), | |
3244 | .mode = 0644, | |
6d9f239a | 3245 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3246 | }, |
3247 | { | |
3248 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 3249 | |
1da177e4 LT |
3250 | .procname = "gc_min_interval", |
3251 | .data = &ip_rt_gc_min_interval, | |
3252 | .maxlen = sizeof(int), | |
3253 | .mode = 0644, | |
6d9f239a | 3254 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3255 | }, |
3256 | { | |
1da177e4 LT |
3257 | .procname = "gc_min_interval_ms", |
3258 | .data = &ip_rt_gc_min_interval, | |
3259 | .maxlen = sizeof(int), | |
3260 | .mode = 0644, | |
6d9f239a | 3261 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
3262 | }, |
3263 | { | |
1da177e4 LT |
3264 | .procname = "gc_timeout", |
3265 | .data = &ip_rt_gc_timeout, | |
3266 | .maxlen = sizeof(int), | |
3267 | .mode = 0644, | |
6d9f239a | 3268 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3269 | }, |
9f28a2fc ED |
3270 | { |
3271 | .procname = "gc_interval", | |
3272 | .data = &ip_rt_gc_interval, | |
3273 | .maxlen = sizeof(int), | |
3274 | .mode = 0644, | |
3275 | .proc_handler = proc_dointvec_jiffies, | |
3276 | }, | |
1da177e4 | 3277 | { |
1da177e4 LT |
3278 | .procname = "redirect_load", |
3279 | .data = &ip_rt_redirect_load, | |
3280 | .maxlen = sizeof(int), | |
3281 | .mode = 0644, | |
6d9f239a | 3282 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3283 | }, |
3284 | { | |
1da177e4 LT |
3285 | .procname = "redirect_number", |
3286 | .data = &ip_rt_redirect_number, | |
3287 | .maxlen = sizeof(int), | |
3288 | .mode = 0644, | |
6d9f239a | 3289 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3290 | }, |
3291 | { | |
1da177e4 LT |
3292 | .procname = "redirect_silence", |
3293 | .data = &ip_rt_redirect_silence, | |
3294 | .maxlen = sizeof(int), | |
3295 | .mode = 0644, | |
6d9f239a | 3296 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3297 | }, |
3298 | { | |
1da177e4 LT |
3299 | .procname = "error_cost", |
3300 | .data = &ip_rt_error_cost, | |
3301 | .maxlen = sizeof(int), | |
3302 | .mode = 0644, | |
6d9f239a | 3303 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3304 | }, |
3305 | { | |
1da177e4 LT |
3306 | .procname = "error_burst", |
3307 | .data = &ip_rt_error_burst, | |
3308 | .maxlen = sizeof(int), | |
3309 | .mode = 0644, | |
6d9f239a | 3310 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3311 | }, |
3312 | { | |
1da177e4 LT |
3313 | .procname = "gc_elasticity", |
3314 | .data = &ip_rt_gc_elasticity, | |
3315 | .maxlen = sizeof(int), | |
3316 | .mode = 0644, | |
6d9f239a | 3317 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3318 | }, |
3319 | { | |
1da177e4 LT |
3320 | .procname = "mtu_expires", |
3321 | .data = &ip_rt_mtu_expires, | |
3322 | .maxlen = sizeof(int), | |
3323 | .mode = 0644, | |
6d9f239a | 3324 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3325 | }, |
3326 | { | |
1da177e4 LT |
3327 | .procname = "min_pmtu", |
3328 | .data = &ip_rt_min_pmtu, | |
3329 | .maxlen = sizeof(int), | |
3330 | .mode = 0644, | |
c7272c2f SD |
3331 | .proc_handler = proc_dointvec_minmax, |
3332 | .extra1 = &ip_min_valid_pmtu, | |
1da177e4 LT |
3333 | }, |
3334 | { | |
1da177e4 LT |
3335 | .procname = "min_adv_mss", |
3336 | .data = &ip_rt_min_advmss, | |
3337 | .maxlen = sizeof(int), | |
3338 | .mode = 0644, | |
6d9f239a | 3339 | .proc_handler = proc_dointvec, |
1da177e4 | 3340 | }, |
f8572d8f | 3341 | { } |
1da177e4 | 3342 | }; |
39a23e75 | 3343 | |
5cdda5f1 CB |
3344 | static const char ipv4_route_flush_procname[] = "flush"; |
3345 | ||
39a23e75 DL |
3346 | static struct ctl_table ipv4_route_flush_table[] = { |
3347 | { | |
5cdda5f1 | 3348 | .procname = ipv4_route_flush_procname, |
39a23e75 DL |
3349 | .maxlen = sizeof(int), |
3350 | .mode = 0200, | |
6d9f239a | 3351 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 3352 | }, |
f8572d8f | 3353 | { }, |
39a23e75 DL |
3354 | }; |
3355 | ||
3356 | static __net_init int sysctl_route_net_init(struct net *net) | |
3357 | { | |
3358 | struct ctl_table *tbl; | |
3359 | ||
3360 | tbl = ipv4_route_flush_table; | |
09ad9bc7 | 3361 | if (!net_eq(net, &init_net)) { |
39a23e75 | 3362 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
51456b29 | 3363 | if (!tbl) |
39a23e75 | 3364 | goto err_dup; |
464dc801 | 3365 | |
5cdda5f1 CB |
3366 | /* Don't export non-whitelisted sysctls to unprivileged users */ |
3367 | if (net->user_ns != &init_user_ns) { | |
3368 | if (tbl[0].procname != ipv4_route_flush_procname) | |
3369 | tbl[0].procname = NULL; | |
3370 | } | |
39a23e75 DL |
3371 | } |
3372 | tbl[0].extra1 = net; | |
3373 | ||
ec8f23ce | 3374 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
51456b29 | 3375 | if (!net->ipv4.route_hdr) |
39a23e75 DL |
3376 | goto err_reg; |
3377 | return 0; | |
3378 | ||
3379 | err_reg: | |
3380 | if (tbl != ipv4_route_flush_table) | |
3381 | kfree(tbl); | |
3382 | err_dup: | |
3383 | return -ENOMEM; | |
3384 | } | |
3385 | ||
3386 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3387 | { | |
3388 | struct ctl_table *tbl; | |
3389 | ||
3390 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3391 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
3392 | BUG_ON(tbl == ipv4_route_flush_table); | |
3393 | kfree(tbl); | |
3394 | } | |
3395 | ||
3396 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3397 | .init = sysctl_route_net_init, | |
3398 | .exit = sysctl_route_net_exit, | |
3399 | }; | |
1da177e4 LT |
3400 | #endif |
3401 | ||
3ee94372 | 3402 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 3403 | { |
ca4c3fc2 | 3404 | atomic_set(&net->ipv4.rt_genid, 0); |
5aad1de5 | 3405 | atomic_set(&net->fnhe_genid, 0); |
7aed9f72 | 3406 | atomic_set(&net->ipv4.dev_addr_genid, get_random_int()); |
9f5e97e5 DL |
3407 | return 0; |
3408 | } | |
3409 | ||
3ee94372 NH |
3410 | static __net_initdata struct pernet_operations rt_genid_ops = { |
3411 | .init = rt_genid_init, | |
9f5e97e5 DL |
3412 | }; |
3413 | ||
c3426b47 DM |
3414 | static int __net_init ipv4_inetpeer_init(struct net *net) |
3415 | { | |
3416 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3417 | ||
3418 | if (!bp) | |
3419 | return -ENOMEM; | |
3420 | inet_peer_base_init(bp); | |
3421 | net->ipv4.peers = bp; | |
3422 | return 0; | |
3423 | } | |
3424 | ||
3425 | static void __net_exit ipv4_inetpeer_exit(struct net *net) | |
3426 | { | |
3427 | struct inet_peer_base *bp = net->ipv4.peers; | |
3428 | ||
3429 | net->ipv4.peers = NULL; | |
56a6b248 | 3430 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3431 | kfree(bp); |
3432 | } | |
3433 | ||
3434 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { | |
3435 | .init = ipv4_inetpeer_init, | |
3436 | .exit = ipv4_inetpeer_exit, | |
3437 | }; | |
9f5e97e5 | 3438 | |
c7066f70 | 3439 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 3440 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 3441 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 | 3442 | |
1da177e4 LT |
3443 | int __init ip_rt_init(void) |
3444 | { | |
5055c371 | 3445 | int cpu; |
1da177e4 | 3446 | |
6da2ec56 KC |
3447 | ip_idents = kmalloc_array(IP_IDENTS_SZ, sizeof(*ip_idents), |
3448 | GFP_KERNEL); | |
73f156a6 ED |
3449 | if (!ip_idents) |
3450 | panic("IP: failed to allocate ip_idents\n"); | |
3451 | ||
3452 | prandom_bytes(ip_idents, IP_IDENTS_SZ * sizeof(*ip_idents)); | |
3453 | ||
355b590c ED |
3454 | ip_tstamps = kcalloc(IP_IDENTS_SZ, sizeof(*ip_tstamps), GFP_KERNEL); |
3455 | if (!ip_tstamps) | |
3456 | panic("IP: failed to allocate ip_tstamps\n"); | |
3457 | ||
5055c371 ED |
3458 | for_each_possible_cpu(cpu) { |
3459 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
3460 | ||
3461 | INIT_LIST_HEAD(&ul->head); | |
3462 | spin_lock_init(&ul->lock); | |
3463 | } | |
c7066f70 | 3464 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 3465 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
3466 | if (!ip_rt_acct) |
3467 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3468 | #endif |
3469 | ||
e5d679f3 AD |
3470 | ipv4_dst_ops.kmem_cachep = |
3471 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 3472 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3473 | |
14e50e57 DM |
3474 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3475 | ||
fc66f95c ED |
3476 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
3477 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
3478 | ||
3479 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
3480 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
3481 | ||
89aef892 DM |
3482 | ipv4_dst_ops.gc_thresh = ~0; |
3483 | ip_rt_max_size = INT_MAX; | |
1da177e4 | 3484 | |
1da177e4 LT |
3485 | devinet_init(); |
3486 | ip_fib_init(); | |
3487 | ||
73b38711 | 3488 | if (ip_rt_proc_init()) |
058bd4d2 | 3489 | pr_err("Unable to create route proc files\n"); |
1da177e4 LT |
3490 | #ifdef CONFIG_XFRM |
3491 | xfrm_init(); | |
703fb94e | 3492 | xfrm4_init(); |
1da177e4 | 3493 | #endif |
394f51ab FW |
3494 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, |
3495 | RTNL_FLAG_DOIT_UNLOCKED); | |
63f3444f | 3496 | |
39a23e75 DL |
3497 | #ifdef CONFIG_SYSCTL |
3498 | register_pernet_subsys(&sysctl_route_ops); | |
3499 | #endif | |
3ee94372 | 3500 | register_pernet_subsys(&rt_genid_ops); |
c3426b47 | 3501 | register_pernet_subsys(&ipv4_inetpeer_ops); |
1bcdca3f | 3502 | return 0; |
1da177e4 LT |
3503 | } |
3504 | ||
a1bc6eb4 | 3505 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3506 | /* |
3507 | * We really need to sanitize the damn ipv4 init order, then all | |
3508 | * this nonsense will go away. | |
3509 | */ | |
3510 | void __init ip_static_sysctl_init(void) | |
3511 | { | |
4e5ca785 | 3512 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
eeb61f71 | 3513 | } |
a1bc6eb4 | 3514 | #endif |