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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * ROUTE - implementation of the IP router. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : Verify area fixes. | |
16 | * Alan Cox : cli() protects routing changes | |
17 | * Rui Oliveira : ICMP routing table updates | |
18 | * (rco@di.uminho.pt) Routing table insertion and update | |
19 | * Linus Torvalds : Rewrote bits to be sensible | |
20 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 21 | * Alan Cox : Super /proc >4K |
1da177e4 LT |
22 | * Alan Cox : MTU in route table |
23 | * Alan Cox : MSS actually. Also added the window | |
24 | * clamper. | |
25 | * Sam Lantinga : Fixed route matching in rt_del() | |
26 | * Alan Cox : Routing cache support. | |
27 | * Alan Cox : Removed compatibility cruft. | |
28 | * Alan Cox : RTF_REJECT support. | |
29 | * Alan Cox : TCP irtt support. | |
30 | * Jonathan Naylor : Added Metric support. | |
31 | * Miquel van Smoorenburg : BSD API fixes. | |
32 | * Miquel van Smoorenburg : Metrics. | |
33 | * Alan Cox : Use __u32 properly | |
34 | * Alan Cox : Aligned routing errors more closely with BSD | |
35 | * our system is still very different. | |
36 | * Alan Cox : Faster /proc handling | |
37 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
38 | * routing caches and better behaviour. | |
e905a9ed | 39 | * |
1da177e4 LT |
40 | * Olaf Erb : irtt wasn't being copied right. |
41 | * Bjorn Ekwall : Kerneld route support. | |
42 | * Alan Cox : Multicast fixed (I hope) | |
43 | * Pavel Krauz : Limited broadcast fixed | |
44 | * Mike McLagan : Routing by source | |
45 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
46 | * route.c and rewritten from scratch. | |
47 | * Andi Kleen : Load-limit warning messages. | |
48 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
49 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
50 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
51 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
52 | * Marc Boucher : routing by fwmark | |
53 | * Robert Olsson : Added rt_cache statistics | |
54 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 55 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
cef2685e IS |
56 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
57 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
58 | * |
59 | * This program is free software; you can redistribute it and/or | |
60 | * modify it under the terms of the GNU General Public License | |
61 | * as published by the Free Software Foundation; either version | |
62 | * 2 of the License, or (at your option) any later version. | |
63 | */ | |
64 | ||
afd46503 JP |
65 | #define pr_fmt(fmt) "IPv4: " fmt |
66 | ||
1da177e4 LT |
67 | #include <linux/module.h> |
68 | #include <asm/uaccess.h> | |
1da177e4 LT |
69 | #include <linux/bitops.h> |
70 | #include <linux/types.h> | |
71 | #include <linux/kernel.h> | |
1da177e4 LT |
72 | #include <linux/mm.h> |
73 | #include <linux/string.h> | |
74 | #include <linux/socket.h> | |
75 | #include <linux/sockios.h> | |
76 | #include <linux/errno.h> | |
77 | #include <linux/in.h> | |
78 | #include <linux/inet.h> | |
79 | #include <linux/netdevice.h> | |
80 | #include <linux/proc_fs.h> | |
81 | #include <linux/init.h> | |
82 | #include <linux/skbuff.h> | |
1da177e4 LT |
83 | #include <linux/inetdevice.h> |
84 | #include <linux/igmp.h> | |
85 | #include <linux/pkt_sched.h> | |
86 | #include <linux/mroute.h> | |
87 | #include <linux/netfilter_ipv4.h> | |
88 | #include <linux/random.h> | |
1da177e4 LT |
89 | #include <linux/rcupdate.h> |
90 | #include <linux/times.h> | |
5a0e3ad6 | 91 | #include <linux/slab.h> |
73f156a6 | 92 | #include <linux/jhash.h> |
352e512c | 93 | #include <net/dst.h> |
1b7179d3 | 94 | #include <net/dst_metadata.h> |
457c4cbc | 95 | #include <net/net_namespace.h> |
1da177e4 LT |
96 | #include <net/protocol.h> |
97 | #include <net/ip.h> | |
98 | #include <net/route.h> | |
99 | #include <net/inetpeer.h> | |
100 | #include <net/sock.h> | |
101 | #include <net/ip_fib.h> | |
102 | #include <net/arp.h> | |
103 | #include <net/tcp.h> | |
104 | #include <net/icmp.h> | |
105 | #include <net/xfrm.h> | |
571e7226 | 106 | #include <net/lwtunnel.h> |
8d71740c | 107 | #include <net/netevent.h> |
63f3444f | 108 | #include <net/rtnetlink.h> |
1da177e4 LT |
109 | #ifdef CONFIG_SYSCTL |
110 | #include <linux/sysctl.h> | |
7426a564 | 111 | #include <linux/kmemleak.h> |
1da177e4 | 112 | #endif |
6e5714ea | 113 | #include <net/secure_seq.h> |
1b7179d3 | 114 | #include <net/ip_tunnels.h> |
cd2fbe1b | 115 | #include <net/vrf.h> |
1da177e4 | 116 | |
68a5e3dd | 117 | #define RT_FL_TOS(oldflp4) \ |
f61759e6 | 118 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
1da177e4 | 119 | |
1da177e4 LT |
120 | #define RT_GC_TIMEOUT (300*HZ) |
121 | ||
1da177e4 | 122 | static int ip_rt_max_size; |
817bc4db SH |
123 | static int ip_rt_redirect_number __read_mostly = 9; |
124 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
125 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
126 | static int ip_rt_error_cost __read_mostly = HZ; | |
127 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
817bc4db SH |
128 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; |
129 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; | |
130 | static int ip_rt_min_advmss __read_mostly = 256; | |
9f28a2fc | 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); | |
d3aaeb38 | 156 | |
1da177e4 LT |
157 | static struct dst_ops ipv4_dst_ops = { |
158 | .family = AF_INET, | |
1da177e4 | 159 | .check = ipv4_dst_check, |
0dbaee3b | 160 | .default_advmss = ipv4_default_advmss, |
ebb762f2 | 161 | .mtu = ipv4_mtu, |
62fa8a84 | 162 | .cow_metrics = ipv4_cow_metrics, |
caacf05e | 163 | .destroy = ipv4_dst_destroy, |
1da177e4 LT |
164 | .negative_advice = ipv4_negative_advice, |
165 | .link_failure = ipv4_link_failure, | |
166 | .update_pmtu = ip_rt_update_pmtu, | |
e47a185b | 167 | .redirect = ip_do_redirect, |
1ac06e03 | 168 | .local_out = __ip_local_out, |
d3aaeb38 | 169 | .neigh_lookup = ipv4_neigh_lookup, |
1da177e4 LT |
170 | }; |
171 | ||
172 | #define ECN_OR_COST(class) TC_PRIO_##class | |
173 | ||
4839c52b | 174 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 175 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 176 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
177 | TC_PRIO_BESTEFFORT, |
178 | ECN_OR_COST(BESTEFFORT), | |
179 | TC_PRIO_BULK, | |
180 | ECN_OR_COST(BULK), | |
181 | TC_PRIO_BULK, | |
182 | ECN_OR_COST(BULK), | |
183 | TC_PRIO_INTERACTIVE, | |
184 | ECN_OR_COST(INTERACTIVE), | |
185 | TC_PRIO_INTERACTIVE, | |
186 | ECN_OR_COST(INTERACTIVE), | |
187 | TC_PRIO_INTERACTIVE_BULK, | |
188 | ECN_OR_COST(INTERACTIVE_BULK), | |
189 | TC_PRIO_INTERACTIVE_BULK, | |
190 | ECN_OR_COST(INTERACTIVE_BULK) | |
191 | }; | |
d4a96865 | 192 | EXPORT_SYMBOL(ip_tos2prio); |
1da177e4 | 193 | |
2f970d83 | 194 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
3ed66e91 | 195 | #define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field) |
1da177e4 | 196 | |
1da177e4 | 197 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
198 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
199 | { | |
29e75252 | 200 | if (*pos) |
89aef892 | 201 | return NULL; |
29e75252 | 202 | return SEQ_START_TOKEN; |
1da177e4 LT |
203 | } |
204 | ||
205 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
206 | { | |
1da177e4 | 207 | ++*pos; |
89aef892 | 208 | return NULL; |
1da177e4 LT |
209 | } |
210 | ||
211 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
212 | { | |
1da177e4 LT |
213 | } |
214 | ||
215 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
216 | { | |
217 | if (v == SEQ_START_TOKEN) | |
218 | seq_printf(seq, "%-127s\n", | |
219 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
220 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
221 | "HHUptod\tSpecDst"); | |
e905a9ed | 222 | return 0; |
1da177e4 LT |
223 | } |
224 | ||
f690808e | 225 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
226 | .start = rt_cache_seq_start, |
227 | .next = rt_cache_seq_next, | |
228 | .stop = rt_cache_seq_stop, | |
229 | .show = rt_cache_seq_show, | |
230 | }; | |
231 | ||
232 | static int rt_cache_seq_open(struct inode *inode, struct file *file) | |
233 | { | |
89aef892 | 234 | return seq_open(file, &rt_cache_seq_ops); |
1da177e4 LT |
235 | } |
236 | ||
9a32144e | 237 | static const struct file_operations rt_cache_seq_fops = { |
1da177e4 LT |
238 | .owner = THIS_MODULE, |
239 | .open = rt_cache_seq_open, | |
240 | .read = seq_read, | |
241 | .llseek = seq_lseek, | |
89aef892 | 242 | .release = seq_release, |
1da177e4 LT |
243 | }; |
244 | ||
245 | ||
246 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) | |
247 | { | |
248 | int cpu; | |
249 | ||
250 | if (*pos == 0) | |
251 | return SEQ_START_TOKEN; | |
252 | ||
0f23174a | 253 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
254 | if (!cpu_possible(cpu)) |
255 | continue; | |
256 | *pos = cpu+1; | |
2f970d83 | 257 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
258 | } |
259 | return NULL; | |
260 | } | |
261 | ||
262 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
263 | { | |
264 | int cpu; | |
265 | ||
0f23174a | 266 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
267 | if (!cpu_possible(cpu)) |
268 | continue; | |
269 | *pos = cpu+1; | |
2f970d83 | 270 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
271 | } |
272 | return NULL; | |
e905a9ed | 273 | |
1da177e4 LT |
274 | } |
275 | ||
276 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
277 | { | |
278 | ||
279 | } | |
280 | ||
281 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
282 | { | |
283 | struct rt_cache_stat *st = v; | |
284 | ||
285 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 286 | 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 |
287 | return 0; |
288 | } | |
e905a9ed | 289 | |
1da177e4 LT |
290 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
291 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", | |
fc66f95c | 292 | dst_entries_get_slow(&ipv4_dst_ops), |
0baf2b35 | 293 | 0, /* st->in_hit */ |
1da177e4 LT |
294 | st->in_slow_tot, |
295 | st->in_slow_mc, | |
296 | st->in_no_route, | |
297 | st->in_brd, | |
298 | st->in_martian_dst, | |
299 | st->in_martian_src, | |
300 | ||
0baf2b35 | 301 | 0, /* st->out_hit */ |
1da177e4 | 302 | st->out_slow_tot, |
e905a9ed | 303 | st->out_slow_mc, |
1da177e4 | 304 | |
0baf2b35 ED |
305 | 0, /* st->gc_total */ |
306 | 0, /* st->gc_ignored */ | |
307 | 0, /* st->gc_goal_miss */ | |
308 | 0, /* st->gc_dst_overflow */ | |
309 | 0, /* st->in_hlist_search */ | |
310 | 0 /* st->out_hlist_search */ | |
1da177e4 LT |
311 | ); |
312 | return 0; | |
313 | } | |
314 | ||
f690808e | 315 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
316 | .start = rt_cpu_seq_start, |
317 | .next = rt_cpu_seq_next, | |
318 | .stop = rt_cpu_seq_stop, | |
319 | .show = rt_cpu_seq_show, | |
320 | }; | |
321 | ||
322 | ||
323 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) | |
324 | { | |
325 | return seq_open(file, &rt_cpu_seq_ops); | |
326 | } | |
327 | ||
9a32144e | 328 | static const struct file_operations rt_cpu_seq_fops = { |
1da177e4 LT |
329 | .owner = THIS_MODULE, |
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 | |
a661c419 AD |
361 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
362 | { | |
363 | return single_open(file, rt_acct_proc_show, NULL); | |
78c686e9 | 364 | } |
a661c419 AD |
365 | |
366 | static const struct file_operations rt_acct_proc_fops = { | |
367 | .owner = THIS_MODULE, | |
368 | .open = rt_acct_proc_open, | |
369 | .read = seq_read, | |
370 | .llseek = seq_lseek, | |
371 | .release = single_release, | |
372 | }; | |
78c686e9 | 373 | #endif |
107f1634 | 374 | |
73b38711 | 375 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
376 | { |
377 | struct proc_dir_entry *pde; | |
378 | ||
d4beaa66 G |
379 | pde = proc_create("rt_cache", S_IRUGO, net->proc_net, |
380 | &rt_cache_seq_fops); | |
107f1634 PE |
381 | if (!pde) |
382 | goto err1; | |
383 | ||
77020720 WC |
384 | pde = proc_create("rt_cache", S_IRUGO, |
385 | net->proc_net_stat, &rt_cpu_seq_fops); | |
107f1634 PE |
386 | if (!pde) |
387 | goto err2; | |
388 | ||
c7066f70 | 389 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 390 | pde = proc_create("rt_acct", 0, net->proc_net, &rt_acct_proc_fops); |
107f1634 PE |
391 | if (!pde) |
392 | goto err3; | |
393 | #endif | |
394 | return 0; | |
395 | ||
c7066f70 | 396 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
397 | err3: |
398 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
399 | #endif | |
400 | err2: | |
401 | remove_proc_entry("rt_cache", net->proc_net); | |
402 | err1: | |
403 | return -ENOMEM; | |
404 | } | |
73b38711 DL |
405 | |
406 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
407 | { | |
408 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
409 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 410 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 411 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 412 | #endif |
73b38711 DL |
413 | } |
414 | ||
415 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
416 | .init = ip_rt_do_proc_init, | |
417 | .exit = ip_rt_do_proc_exit, | |
418 | }; | |
419 | ||
420 | static int __init ip_rt_proc_init(void) | |
421 | { | |
422 | return register_pernet_subsys(&ip_rt_proc_ops); | |
423 | } | |
424 | ||
107f1634 | 425 | #else |
73b38711 | 426 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
427 | { |
428 | return 0; | |
429 | } | |
1da177e4 | 430 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 431 | |
4331debc | 432 | static inline bool rt_is_expired(const struct rtable *rth) |
e84f84f2 | 433 | { |
ca4c3fc2 | 434 | return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)); |
e84f84f2 DL |
435 | } |
436 | ||
4ccfe6d4 | 437 | void rt_cache_flush(struct net *net) |
1da177e4 | 438 | { |
ca4c3fc2 | 439 | rt_genid_bump_ipv4(net); |
98376387 ED |
440 | } |
441 | ||
f894cbf8 DM |
442 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
443 | struct sk_buff *skb, | |
444 | const void *daddr) | |
3769cffb | 445 | { |
d3aaeb38 DM |
446 | struct net_device *dev = dst->dev; |
447 | const __be32 *pkey = daddr; | |
39232973 | 448 | const struct rtable *rt; |
3769cffb DM |
449 | struct neighbour *n; |
450 | ||
39232973 | 451 | rt = (const struct rtable *) dst; |
a263b309 | 452 | if (rt->rt_gateway) |
39232973 | 453 | pkey = (const __be32 *) &rt->rt_gateway; |
f894cbf8 DM |
454 | else if (skb) |
455 | pkey = &ip_hdr(skb)->daddr; | |
d3aaeb38 | 456 | |
80703d26 | 457 | n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey); |
d3aaeb38 DM |
458 | if (n) |
459 | return n; | |
32092ecf | 460 | return neigh_create(&arp_tbl, pkey, dev); |
d3aaeb38 DM |
461 | } |
462 | ||
04ca6973 | 463 | #define IP_IDENTS_SZ 2048u |
04ca6973 | 464 | |
355b590c ED |
465 | static atomic_t *ip_idents __read_mostly; |
466 | static u32 *ip_tstamps __read_mostly; | |
04ca6973 ED |
467 | |
468 | /* In order to protect privacy, we add a perturbation to identifiers | |
469 | * if one generator is seldom used. This makes hard for an attacker | |
470 | * to infer how many packets were sent between two points in time. | |
471 | */ | |
472 | u32 ip_idents_reserve(u32 hash, int segs) | |
473 | { | |
355b590c ED |
474 | u32 *p_tstamp = ip_tstamps + hash % IP_IDENTS_SZ; |
475 | atomic_t *p_id = ip_idents + hash % IP_IDENTS_SZ; | |
476 | u32 old = ACCESS_ONCE(*p_tstamp); | |
04ca6973 ED |
477 | u32 now = (u32)jiffies; |
478 | u32 delta = 0; | |
479 | ||
355b590c | 480 | if (old != now && cmpxchg(p_tstamp, old, now) == old) |
04ca6973 ED |
481 | delta = prandom_u32_max(now - old); |
482 | ||
355b590c | 483 | return atomic_add_return(segs + delta, p_id) - segs; |
04ca6973 ED |
484 | } |
485 | EXPORT_SYMBOL(ip_idents_reserve); | |
1da177e4 | 486 | |
b6a7719a | 487 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs) |
1da177e4 | 488 | { |
73f156a6 ED |
489 | static u32 ip_idents_hashrnd __read_mostly; |
490 | u32 hash, id; | |
1da177e4 | 491 | |
73f156a6 | 492 | net_get_random_once(&ip_idents_hashrnd, sizeof(ip_idents_hashrnd)); |
1da177e4 | 493 | |
04ca6973 ED |
494 | hash = jhash_3words((__force u32)iph->daddr, |
495 | (__force u32)iph->saddr, | |
b6a7719a | 496 | iph->protocol ^ net_hash_mix(net), |
04ca6973 | 497 | ip_idents_hashrnd); |
73f156a6 ED |
498 | id = ip_idents_reserve(hash, segs); |
499 | iph->id = htons(id); | |
1da177e4 | 500 | } |
4bc2f18b | 501 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 | 502 | |
5abf7f7e | 503 | static void __build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
4895c771 DM |
504 | const struct iphdr *iph, |
505 | int oif, u8 tos, | |
506 | u8 prot, u32 mark, int flow_flags) | |
507 | { | |
508 | if (sk) { | |
509 | const struct inet_sock *inet = inet_sk(sk); | |
510 | ||
511 | oif = sk->sk_bound_dev_if; | |
512 | mark = sk->sk_mark; | |
513 | tos = RT_CONN_FLAGS(sk); | |
514 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; | |
515 | } | |
516 | flowi4_init_output(fl4, oif, mark, tos, | |
517 | RT_SCOPE_UNIVERSE, prot, | |
518 | flow_flags, | |
519 | iph->daddr, iph->saddr, 0, 0); | |
520 | } | |
521 | ||
5abf7f7e ED |
522 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
523 | const struct sock *sk) | |
4895c771 DM |
524 | { |
525 | const struct iphdr *iph = ip_hdr(skb); | |
526 | int oif = skb->dev->ifindex; | |
527 | u8 tos = RT_TOS(iph->tos); | |
528 | u8 prot = iph->protocol; | |
529 | u32 mark = skb->mark; | |
530 | ||
531 | __build_flow_key(fl4, sk, iph, oif, tos, prot, mark, 0); | |
532 | } | |
533 | ||
5abf7f7e | 534 | static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk) |
4895c771 DM |
535 | { |
536 | const struct inet_sock *inet = inet_sk(sk); | |
5abf7f7e | 537 | const struct ip_options_rcu *inet_opt; |
4895c771 DM |
538 | __be32 daddr = inet->inet_daddr; |
539 | ||
540 | rcu_read_lock(); | |
541 | inet_opt = rcu_dereference(inet->inet_opt); | |
542 | if (inet_opt && inet_opt->opt.srr) | |
543 | daddr = inet_opt->opt.faddr; | |
544 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, | |
545 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, | |
546 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, | |
547 | inet_sk_flowi_flags(sk), | |
548 | daddr, inet->inet_saddr, 0, 0); | |
549 | rcu_read_unlock(); | |
550 | } | |
551 | ||
5abf7f7e ED |
552 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
553 | const struct sk_buff *skb) | |
4895c771 DM |
554 | { |
555 | if (skb) | |
556 | build_skb_flow_key(fl4, skb, sk); | |
557 | else | |
558 | build_sk_flow_key(fl4, sk); | |
559 | } | |
560 | ||
c5038a83 DM |
561 | static inline void rt_free(struct rtable *rt) |
562 | { | |
563 | call_rcu(&rt->dst.rcu_head, dst_rcu_free); | |
564 | } | |
565 | ||
566 | static DEFINE_SPINLOCK(fnhe_lock); | |
4895c771 | 567 | |
2ffae99d TT |
568 | static void fnhe_flush_routes(struct fib_nh_exception *fnhe) |
569 | { | |
570 | struct rtable *rt; | |
571 | ||
572 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
573 | if (rt) { | |
574 | RCU_INIT_POINTER(fnhe->fnhe_rth_input, NULL); | |
575 | rt_free(rt); | |
576 | } | |
577 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
578 | if (rt) { | |
579 | RCU_INIT_POINTER(fnhe->fnhe_rth_output, NULL); | |
580 | rt_free(rt); | |
581 | } | |
582 | } | |
583 | ||
aee06da6 | 584 | static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) |
4895c771 DM |
585 | { |
586 | struct fib_nh_exception *fnhe, *oldest; | |
587 | ||
588 | oldest = rcu_dereference(hash->chain); | |
589 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; | |
590 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
591 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) | |
592 | oldest = fnhe; | |
593 | } | |
2ffae99d | 594 | fnhe_flush_routes(oldest); |
4895c771 DM |
595 | return oldest; |
596 | } | |
597 | ||
d3a25c98 DM |
598 | static inline u32 fnhe_hashfun(__be32 daddr) |
599 | { | |
d546c621 | 600 | static u32 fnhe_hashrnd __read_mostly; |
d3a25c98 DM |
601 | u32 hval; |
602 | ||
d546c621 ED |
603 | net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd)); |
604 | hval = jhash_1word((__force u32) daddr, fnhe_hashrnd); | |
605 | return hash_32(hval, FNHE_HASH_SHIFT); | |
d3a25c98 DM |
606 | } |
607 | ||
387aa65a TT |
608 | static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |
609 | { | |
610 | rt->rt_pmtu = fnhe->fnhe_pmtu; | |
611 | rt->dst.expires = fnhe->fnhe_expires; | |
612 | ||
613 | if (fnhe->fnhe_gw) { | |
614 | rt->rt_flags |= RTCF_REDIRECTED; | |
615 | rt->rt_gateway = fnhe->fnhe_gw; | |
616 | rt->rt_uses_gateway = 1; | |
617 | } | |
618 | } | |
619 | ||
aee06da6 JA |
620 | static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, |
621 | u32 pmtu, unsigned long expires) | |
4895c771 | 622 | { |
aee06da6 | 623 | struct fnhe_hash_bucket *hash; |
4895c771 | 624 | struct fib_nh_exception *fnhe; |
387aa65a TT |
625 | struct rtable *rt; |
626 | unsigned int i; | |
4895c771 | 627 | int depth; |
aee06da6 JA |
628 | u32 hval = fnhe_hashfun(daddr); |
629 | ||
c5038a83 | 630 | spin_lock_bh(&fnhe_lock); |
4895c771 | 631 | |
caa41527 | 632 | hash = rcu_dereference(nh->nh_exceptions); |
4895c771 | 633 | if (!hash) { |
aee06da6 | 634 | hash = kzalloc(FNHE_HASH_SIZE * sizeof(*hash), GFP_ATOMIC); |
4895c771 | 635 | if (!hash) |
aee06da6 | 636 | goto out_unlock; |
caa41527 | 637 | rcu_assign_pointer(nh->nh_exceptions, hash); |
4895c771 DM |
638 | } |
639 | ||
4895c771 DM |
640 | hash += hval; |
641 | ||
642 | depth = 0; | |
643 | for (fnhe = rcu_dereference(hash->chain); fnhe; | |
644 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
645 | if (fnhe->fnhe_daddr == daddr) | |
aee06da6 | 646 | break; |
4895c771 DM |
647 | depth++; |
648 | } | |
649 | ||
aee06da6 JA |
650 | if (fnhe) { |
651 | if (gw) | |
652 | fnhe->fnhe_gw = gw; | |
653 | if (pmtu) { | |
654 | fnhe->fnhe_pmtu = pmtu; | |
387aa65a | 655 | fnhe->fnhe_expires = max(1UL, expires); |
aee06da6 | 656 | } |
387aa65a | 657 | /* Update all cached dsts too */ |
2ffae99d TT |
658 | rt = rcu_dereference(fnhe->fnhe_rth_input); |
659 | if (rt) | |
660 | fill_route_from_fnhe(rt, fnhe); | |
661 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
387aa65a TT |
662 | if (rt) |
663 | fill_route_from_fnhe(rt, fnhe); | |
aee06da6 JA |
664 | } else { |
665 | if (depth > FNHE_RECLAIM_DEPTH) | |
666 | fnhe = fnhe_oldest(hash); | |
667 | else { | |
668 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); | |
669 | if (!fnhe) | |
670 | goto out_unlock; | |
671 | ||
672 | fnhe->fnhe_next = hash->chain; | |
673 | rcu_assign_pointer(hash->chain, fnhe); | |
674 | } | |
5aad1de5 | 675 | fnhe->fnhe_genid = fnhe_genid(dev_net(nh->nh_dev)); |
aee06da6 JA |
676 | fnhe->fnhe_daddr = daddr; |
677 | fnhe->fnhe_gw = gw; | |
678 | fnhe->fnhe_pmtu = pmtu; | |
679 | fnhe->fnhe_expires = expires; | |
387aa65a TT |
680 | |
681 | /* Exception created; mark the cached routes for the nexthop | |
682 | * stale, so anyone caching it rechecks if this exception | |
683 | * applies to them. | |
684 | */ | |
2ffae99d TT |
685 | rt = rcu_dereference(nh->nh_rth_input); |
686 | if (rt) | |
687 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
688 | ||
387aa65a TT |
689 | for_each_possible_cpu(i) { |
690 | struct rtable __rcu **prt; | |
691 | prt = per_cpu_ptr(nh->nh_pcpu_rth_output, i); | |
692 | rt = rcu_dereference(*prt); | |
693 | if (rt) | |
694 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
695 | } | |
4895c771 | 696 | } |
4895c771 | 697 | |
4895c771 | 698 | fnhe->fnhe_stamp = jiffies; |
aee06da6 JA |
699 | |
700 | out_unlock: | |
c5038a83 | 701 | spin_unlock_bh(&fnhe_lock); |
4895c771 DM |
702 | } |
703 | ||
ceb33206 DM |
704 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
705 | bool kill_route) | |
1da177e4 | 706 | { |
e47a185b | 707 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
94206125 | 708 | __be32 old_gw = ip_hdr(skb)->saddr; |
e47a185b | 709 | struct net_device *dev = skb->dev; |
e47a185b | 710 | struct in_device *in_dev; |
4895c771 | 711 | struct fib_result res; |
e47a185b | 712 | struct neighbour *n; |
317805b8 | 713 | struct net *net; |
1da177e4 | 714 | |
94206125 DM |
715 | switch (icmp_hdr(skb)->code & 7) { |
716 | case ICMP_REDIR_NET: | |
717 | case ICMP_REDIR_NETTOS: | |
718 | case ICMP_REDIR_HOST: | |
719 | case ICMP_REDIR_HOSTTOS: | |
720 | break; | |
721 | ||
722 | default: | |
723 | return; | |
724 | } | |
725 | ||
e47a185b DM |
726 | if (rt->rt_gateway != old_gw) |
727 | return; | |
728 | ||
729 | in_dev = __in_dev_get_rcu(dev); | |
730 | if (!in_dev) | |
731 | return; | |
732 | ||
c346dca1 | 733 | net = dev_net(dev); |
9d4fb27d JP |
734 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
735 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
736 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
737 | goto reject_redirect; |
738 | ||
739 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
740 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
741 | goto reject_redirect; | |
742 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
743 | goto reject_redirect; | |
744 | } else { | |
317805b8 | 745 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
746 | goto reject_redirect; |
747 | } | |
748 | ||
4895c771 | 749 | n = ipv4_neigh_lookup(&rt->dst, NULL, &new_gw); |
2c1a4311 | 750 | if (!IS_ERR(n)) { |
e47a185b DM |
751 | if (!(n->nud_state & NUD_VALID)) { |
752 | neigh_event_send(n, NULL); | |
753 | } else { | |
0eeb075f | 754 | if (fib_lookup(net, fl4, &res, 0) == 0) { |
4895c771 | 755 | struct fib_nh *nh = &FIB_RES_NH(res); |
4895c771 | 756 | |
aee06da6 JA |
757 | update_or_create_fnhe(nh, fl4->daddr, new_gw, |
758 | 0, 0); | |
4895c771 | 759 | } |
ceb33206 DM |
760 | if (kill_route) |
761 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
e47a185b DM |
762 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
763 | } | |
764 | neigh_release(n); | |
765 | } | |
766 | return; | |
767 | ||
768 | reject_redirect: | |
769 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
99ee038d DM |
770 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
771 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
772 | __be32 daddr = iph->daddr; | |
773 | __be32 saddr = iph->saddr; | |
774 | ||
e47a185b DM |
775 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
776 | " Advised path = %pI4 -> %pI4\n", | |
777 | &old_gw, dev->name, &new_gw, | |
778 | &saddr, &daddr); | |
99ee038d | 779 | } |
e47a185b DM |
780 | #endif |
781 | ; | |
782 | } | |
783 | ||
4895c771 DM |
784 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
785 | { | |
786 | struct rtable *rt; | |
787 | struct flowi4 fl4; | |
f96ef988 MK |
788 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
789 | int oif = skb->dev->ifindex; | |
790 | u8 tos = RT_TOS(iph->tos); | |
791 | u8 prot = iph->protocol; | |
792 | u32 mark = skb->mark; | |
4895c771 DM |
793 | |
794 | rt = (struct rtable *) dst; | |
795 | ||
f96ef988 | 796 | __build_flow_key(&fl4, sk, iph, oif, tos, prot, mark, 0); |
ceb33206 | 797 | __ip_do_redirect(rt, skb, &fl4, true); |
4895c771 DM |
798 | } |
799 | ||
1da177e4 LT |
800 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
801 | { | |
ee6b9673 | 802 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
803 | struct dst_entry *ret = dst; |
804 | ||
805 | if (rt) { | |
d11a4dc1 | 806 | if (dst->obsolete > 0) { |
1da177e4 LT |
807 | ip_rt_put(rt); |
808 | ret = NULL; | |
5943634f DM |
809 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
810 | rt->dst.expires) { | |
89aef892 | 811 | ip_rt_put(rt); |
1da177e4 LT |
812 | ret = NULL; |
813 | } | |
814 | } | |
815 | return ret; | |
816 | } | |
817 | ||
818 | /* | |
819 | * Algorithm: | |
820 | * 1. The first ip_rt_redirect_number redirects are sent | |
821 | * with exponential backoff, then we stop sending them at all, | |
822 | * assuming that the host ignores our redirects. | |
823 | * 2. If we did not see packets requiring redirects | |
824 | * during ip_rt_redirect_silence, we assume that the host | |
825 | * forgot redirected route and start to send redirects again. | |
826 | * | |
827 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
828 | * in icmp.c. | |
829 | * | |
830 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
831 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
832 | */ | |
833 | ||
834 | void ip_rt_send_redirect(struct sk_buff *skb) | |
835 | { | |
511c3f92 | 836 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 837 | struct in_device *in_dev; |
92d86829 | 838 | struct inet_peer *peer; |
1d861aa4 | 839 | struct net *net; |
30038fc6 | 840 | int log_martians; |
192132b9 | 841 | int vif; |
1da177e4 | 842 | |
30038fc6 | 843 | rcu_read_lock(); |
d8d1f30b | 844 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
845 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
846 | rcu_read_unlock(); | |
1da177e4 | 847 | return; |
30038fc6 ED |
848 | } |
849 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
192132b9 | 850 | vif = vrf_master_ifindex_rcu(rt->dst.dev); |
30038fc6 | 851 | rcu_read_unlock(); |
1da177e4 | 852 | |
1d861aa4 | 853 | net = dev_net(rt->dst.dev); |
192132b9 | 854 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, vif, 1); |
92d86829 | 855 | if (!peer) { |
e81da0e1 JA |
856 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, |
857 | rt_nexthop(rt, ip_hdr(skb)->daddr)); | |
92d86829 DM |
858 | return; |
859 | } | |
860 | ||
1da177e4 LT |
861 | /* No redirected packets during ip_rt_redirect_silence; |
862 | * reset the algorithm. | |
863 | */ | |
92d86829 DM |
864 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
865 | peer->rate_tokens = 0; | |
1da177e4 LT |
866 | |
867 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 868 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 869 | */ |
92d86829 DM |
870 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
871 | peer->rate_last = jiffies; | |
1d861aa4 | 872 | goto out_put_peer; |
1da177e4 LT |
873 | } |
874 | ||
875 | /* Check for load limit; set rate_last to the latest sent | |
876 | * redirect. | |
877 | */ | |
92d86829 | 878 | if (peer->rate_tokens == 0 || |
14fb8a76 | 879 | time_after(jiffies, |
92d86829 DM |
880 | (peer->rate_last + |
881 | (ip_rt_redirect_load << peer->rate_tokens)))) { | |
e81da0e1 JA |
882 | __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr); |
883 | ||
884 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw); | |
92d86829 DM |
885 | peer->rate_last = jiffies; |
886 | ++peer->rate_tokens; | |
1da177e4 | 887 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
30038fc6 | 888 | if (log_martians && |
e87cc472 JP |
889 | peer->rate_tokens == ip_rt_redirect_number) |
890 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", | |
92101b3b | 891 | &ip_hdr(skb)->saddr, inet_iif(skb), |
e81da0e1 | 892 | &ip_hdr(skb)->daddr, &gw); |
1da177e4 LT |
893 | #endif |
894 | } | |
1d861aa4 DM |
895 | out_put_peer: |
896 | inet_putpeer(peer); | |
1da177e4 LT |
897 | } |
898 | ||
899 | static int ip_error(struct sk_buff *skb) | |
900 | { | |
251da413 | 901 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
511c3f92 | 902 | struct rtable *rt = skb_rtable(skb); |
92d86829 | 903 | struct inet_peer *peer; |
1da177e4 | 904 | unsigned long now; |
251da413 | 905 | struct net *net; |
92d86829 | 906 | bool send; |
1da177e4 LT |
907 | int code; |
908 | ||
381c759d EB |
909 | /* IP on this device is disabled. */ |
910 | if (!in_dev) | |
911 | goto out; | |
912 | ||
251da413 DM |
913 | net = dev_net(rt->dst.dev); |
914 | if (!IN_DEV_FORWARD(in_dev)) { | |
915 | switch (rt->dst.error) { | |
916 | case EHOSTUNREACH: | |
917 | IP_INC_STATS_BH(net, IPSTATS_MIB_INADDRERRORS); | |
918 | break; | |
919 | ||
920 | case ENETUNREACH: | |
921 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); | |
922 | break; | |
923 | } | |
924 | goto out; | |
925 | } | |
926 | ||
d8d1f30b | 927 | switch (rt->dst.error) { |
4500ebf8 JP |
928 | case EINVAL: |
929 | default: | |
930 | goto out; | |
931 | case EHOSTUNREACH: | |
932 | code = ICMP_HOST_UNREACH; | |
933 | break; | |
934 | case ENETUNREACH: | |
935 | code = ICMP_NET_UNREACH; | |
251da413 | 936 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); |
4500ebf8 JP |
937 | break; |
938 | case EACCES: | |
939 | code = ICMP_PKT_FILTERED; | |
940 | break; | |
1da177e4 LT |
941 | } |
942 | ||
192132b9 DA |
943 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, |
944 | vrf_master_ifindex(skb->dev), 1); | |
92d86829 DM |
945 | |
946 | send = true; | |
947 | if (peer) { | |
948 | now = jiffies; | |
949 | peer->rate_tokens += now - peer->rate_last; | |
950 | if (peer->rate_tokens > ip_rt_error_burst) | |
951 | peer->rate_tokens = ip_rt_error_burst; | |
952 | peer->rate_last = now; | |
953 | if (peer->rate_tokens >= ip_rt_error_cost) | |
954 | peer->rate_tokens -= ip_rt_error_cost; | |
955 | else | |
956 | send = false; | |
1d861aa4 | 957 | inet_putpeer(peer); |
1da177e4 | 958 | } |
92d86829 DM |
959 | if (send) |
960 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 LT |
961 | |
962 | out: kfree_skb(skb); | |
963 | return 0; | |
e905a9ed | 964 | } |
1da177e4 | 965 | |
d851c12b | 966 | static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
1da177e4 | 967 | { |
d851c12b | 968 | struct dst_entry *dst = &rt->dst; |
4895c771 | 969 | struct fib_result res; |
2c8cec5c | 970 | |
fa1e492a SK |
971 | if (dst_metric_locked(dst, RTAX_MTU)) |
972 | return; | |
973 | ||
cb6ccf09 | 974 | if (ipv4_mtu(dst) < mtu) |
3cdaa5be LW |
975 | return; |
976 | ||
5943634f DM |
977 | if (mtu < ip_rt_min_pmtu) |
978 | mtu = ip_rt_min_pmtu; | |
2c8cec5c | 979 | |
f016229e TT |
980 | if (rt->rt_pmtu == mtu && |
981 | time_before(jiffies, dst->expires - ip_rt_mtu_expires / 2)) | |
982 | return; | |
983 | ||
c5ae7d41 | 984 | rcu_read_lock(); |
0eeb075f | 985 | if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) { |
4895c771 | 986 | struct fib_nh *nh = &FIB_RES_NH(res); |
4895c771 | 987 | |
aee06da6 JA |
988 | update_or_create_fnhe(nh, fl4->daddr, 0, mtu, |
989 | jiffies + ip_rt_mtu_expires); | |
4895c771 | 990 | } |
c5ae7d41 | 991 | rcu_read_unlock(); |
1da177e4 LT |
992 | } |
993 | ||
4895c771 DM |
994 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
995 | struct sk_buff *skb, u32 mtu) | |
996 | { | |
997 | struct rtable *rt = (struct rtable *) dst; | |
998 | struct flowi4 fl4; | |
999 | ||
1000 | ip_rt_build_flow_key(&fl4, sk, skb); | |
d851c12b | 1001 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
4895c771 DM |
1002 | } |
1003 | ||
36393395 DM |
1004 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
1005 | int oif, u32 mark, u8 protocol, int flow_flags) | |
1006 | { | |
4895c771 | 1007 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
36393395 DM |
1008 | struct flowi4 fl4; |
1009 | struct rtable *rt; | |
1010 | ||
1b3c61dc LC |
1011 | if (!mark) |
1012 | mark = IP4_REPLY_MARK(net, skb->mark); | |
1013 | ||
4895c771 DM |
1014 | __build_flow_key(&fl4, NULL, iph, oif, |
1015 | RT_TOS(iph->tos), protocol, mark, flow_flags); | |
36393395 DM |
1016 | rt = __ip_route_output_key(net, &fl4); |
1017 | if (!IS_ERR(rt)) { | |
4895c771 | 1018 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
36393395 DM |
1019 | ip_rt_put(rt); |
1020 | } | |
1021 | } | |
1022 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); | |
1023 | ||
9cb3a50c | 1024 | static void __ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
36393395 | 1025 | { |
4895c771 DM |
1026 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1027 | struct flowi4 fl4; | |
1028 | struct rtable *rt; | |
36393395 | 1029 | |
4895c771 | 1030 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
1b3c61dc LC |
1031 | |
1032 | if (!fl4.flowi4_mark) | |
1033 | fl4.flowi4_mark = IP4_REPLY_MARK(sock_net(sk), skb->mark); | |
1034 | ||
4895c771 DM |
1035 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
1036 | if (!IS_ERR(rt)) { | |
1037 | __ip_rt_update_pmtu(rt, &fl4, mtu); | |
1038 | ip_rt_put(rt); | |
1039 | } | |
36393395 | 1040 | } |
9cb3a50c SK |
1041 | |
1042 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) | |
1043 | { | |
1044 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
1045 | struct flowi4 fl4; | |
1046 | struct rtable *rt; | |
7f502361 | 1047 | struct dst_entry *odst = NULL; |
b44108db | 1048 | bool new = false; |
9cb3a50c SK |
1049 | |
1050 | bh_lock_sock(sk); | |
482fc609 HFS |
1051 | |
1052 | if (!ip_sk_accept_pmtu(sk)) | |
1053 | goto out; | |
1054 | ||
7f502361 | 1055 | odst = sk_dst_get(sk); |
9cb3a50c | 1056 | |
7f502361 | 1057 | if (sock_owned_by_user(sk) || !odst) { |
9cb3a50c SK |
1058 | __ipv4_sk_update_pmtu(skb, sk, mtu); |
1059 | goto out; | |
1060 | } | |
1061 | ||
1062 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); | |
1063 | ||
7f502361 | 1064 | rt = (struct rtable *)odst; |
51456b29 | 1065 | if (odst->obsolete && !odst->ops->check(odst, 0)) { |
9cb3a50c SK |
1066 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1067 | if (IS_ERR(rt)) | |
1068 | goto out; | |
b44108db SK |
1069 | |
1070 | new = true; | |
9cb3a50c SK |
1071 | } |
1072 | ||
1073 | __ip_rt_update_pmtu((struct rtable *) rt->dst.path, &fl4, mtu); | |
1074 | ||
7f502361 | 1075 | if (!dst_check(&rt->dst, 0)) { |
b44108db SK |
1076 | if (new) |
1077 | dst_release(&rt->dst); | |
1078 | ||
9cb3a50c SK |
1079 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1080 | if (IS_ERR(rt)) | |
1081 | goto out; | |
1082 | ||
b44108db | 1083 | new = true; |
9cb3a50c SK |
1084 | } |
1085 | ||
b44108db | 1086 | if (new) |
7f502361 | 1087 | sk_dst_set(sk, &rt->dst); |
9cb3a50c SK |
1088 | |
1089 | out: | |
1090 | bh_unlock_sock(sk); | |
7f502361 | 1091 | dst_release(odst); |
9cb3a50c | 1092 | } |
36393395 | 1093 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
f39925db | 1094 | |
b42597e2 DM |
1095 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
1096 | int oif, u32 mark, u8 protocol, int flow_flags) | |
1097 | { | |
4895c771 | 1098 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
b42597e2 DM |
1099 | struct flowi4 fl4; |
1100 | struct rtable *rt; | |
1101 | ||
4895c771 DM |
1102 | __build_flow_key(&fl4, NULL, iph, oif, |
1103 | RT_TOS(iph->tos), protocol, mark, flow_flags); | |
b42597e2 DM |
1104 | rt = __ip_route_output_key(net, &fl4); |
1105 | if (!IS_ERR(rt)) { | |
ceb33206 | 1106 | __ip_do_redirect(rt, skb, &fl4, false); |
b42597e2 DM |
1107 | ip_rt_put(rt); |
1108 | } | |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(ipv4_redirect); | |
1111 | ||
1112 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1113 | { | |
4895c771 DM |
1114 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
1115 | struct flowi4 fl4; | |
1116 | struct rtable *rt; | |
b42597e2 | 1117 | |
4895c771 DM |
1118 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
1119 | rt = __ip_route_output_key(sock_net(sk), &fl4); | |
1120 | if (!IS_ERR(rt)) { | |
ceb33206 | 1121 | __ip_do_redirect(rt, skb, &fl4, false); |
4895c771 DM |
1122 | ip_rt_put(rt); |
1123 | } | |
b42597e2 DM |
1124 | } |
1125 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); | |
1126 | ||
efbc368d DM |
1127 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
1128 | { | |
1129 | struct rtable *rt = (struct rtable *) dst; | |
1130 | ||
ceb33206 DM |
1131 | /* All IPV4 dsts are created with ->obsolete set to the value |
1132 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1133 | * into this function always. | |
1134 | * | |
387aa65a TT |
1135 | * When a PMTU/redirect information update invalidates a route, |
1136 | * this is indicated by setting obsolete to DST_OBSOLETE_KILL or | |
1137 | * DST_OBSOLETE_DEAD by dst_free(). | |
ceb33206 | 1138 | */ |
387aa65a | 1139 | if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt)) |
efbc368d | 1140 | return NULL; |
d11a4dc1 | 1141 | return dst; |
1da177e4 LT |
1142 | } |
1143 | ||
1da177e4 LT |
1144 | static void ipv4_link_failure(struct sk_buff *skb) |
1145 | { | |
1146 | struct rtable *rt; | |
1147 | ||
1148 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
1149 | ||
511c3f92 | 1150 | rt = skb_rtable(skb); |
5943634f DM |
1151 | if (rt) |
1152 | dst_set_expires(&rt->dst, 0); | |
1da177e4 LT |
1153 | } |
1154 | ||
aad88724 | 1155 | static int ip_rt_bug(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1156 | { |
91df42be JP |
1157 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
1158 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1159 | skb->dev ? skb->dev->name : "?"); | |
1da177e4 | 1160 | kfree_skb(skb); |
c378a9c0 | 1161 | WARN_ON(1); |
1da177e4 LT |
1162 | return 0; |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | We do not cache source address of outgoing interface, | |
1167 | because it is used only by IP RR, TS and SRR options, | |
1168 | so that it out of fast path. | |
1169 | ||
1170 | BTW remember: "addr" is allowed to be not aligned | |
1171 | in IP options! | |
1172 | */ | |
1173 | ||
8e36360a | 1174 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1175 | { |
a61ced5d | 1176 | __be32 src; |
1da177e4 | 1177 | |
c7537967 | 1178 | if (rt_is_output_route(rt)) |
c5be24ff | 1179 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1180 | else { |
8e36360a DM |
1181 | struct fib_result res; |
1182 | struct flowi4 fl4; | |
1183 | struct iphdr *iph; | |
1184 | ||
1185 | iph = ip_hdr(skb); | |
1186 | ||
1187 | memset(&fl4, 0, sizeof(fl4)); | |
1188 | fl4.daddr = iph->daddr; | |
1189 | fl4.saddr = iph->saddr; | |
b0fe4a31 | 1190 | fl4.flowi4_tos = RT_TOS(iph->tos); |
8e36360a DM |
1191 | fl4.flowi4_oif = rt->dst.dev->ifindex; |
1192 | fl4.flowi4_iif = skb->dev->ifindex; | |
1193 | fl4.flowi4_mark = skb->mark; | |
5e2b61f7 | 1194 | |
ebc0ffae | 1195 | rcu_read_lock(); |
0eeb075f | 1196 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0) |
436c3b66 | 1197 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
ebc0ffae | 1198 | else |
f8126f1d DM |
1199 | src = inet_select_addr(rt->dst.dev, |
1200 | rt_nexthop(rt, iph->daddr), | |
1201 | RT_SCOPE_UNIVERSE); | |
ebc0ffae ED |
1202 | rcu_read_unlock(); |
1203 | } | |
1da177e4 LT |
1204 | memcpy(addr, &src, 4); |
1205 | } | |
1206 | ||
c7066f70 | 1207 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1208 | static void set_class_tag(struct rtable *rt, u32 tag) |
1209 | { | |
d8d1f30b CG |
1210 | if (!(rt->dst.tclassid & 0xFFFF)) |
1211 | rt->dst.tclassid |= tag & 0xFFFF; | |
1212 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1213 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1214 | } |
1215 | #endif | |
1216 | ||
0dbaee3b DM |
1217 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1218 | { | |
1219 | unsigned int advmss = dst_metric_raw(dst, RTAX_ADVMSS); | |
1220 | ||
1221 | if (advmss == 0) { | |
1222 | advmss = max_t(unsigned int, dst->dev->mtu - 40, | |
1223 | ip_rt_min_advmss); | |
1224 | if (advmss > 65535 - 40) | |
1225 | advmss = 65535 - 40; | |
1226 | } | |
1227 | return advmss; | |
1228 | } | |
1229 | ||
ebb762f2 | 1230 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
d33e4553 | 1231 | { |
261663b0 | 1232 | const struct rtable *rt = (const struct rtable *) dst; |
5943634f DM |
1233 | unsigned int mtu = rt->rt_pmtu; |
1234 | ||
98d75c37 | 1235 | if (!mtu || time_after_eq(jiffies, rt->dst.expires)) |
5943634f | 1236 | mtu = dst_metric_raw(dst, RTAX_MTU); |
618f9bc7 | 1237 | |
38d523e2 | 1238 | if (mtu) |
618f9bc7 SK |
1239 | return mtu; |
1240 | ||
1241 | mtu = dst->dev->mtu; | |
d33e4553 DM |
1242 | |
1243 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { | |
155e8336 | 1244 | if (rt->rt_uses_gateway && mtu > 576) |
d33e4553 DM |
1245 | mtu = 576; |
1246 | } | |
1247 | ||
734d2725 | 1248 | return min_t(unsigned int, mtu, IP_MAX_MTU); |
d33e4553 DM |
1249 | } |
1250 | ||
f2bb4bed | 1251 | static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr) |
4895c771 | 1252 | { |
caa41527 | 1253 | struct fnhe_hash_bucket *hash = rcu_dereference(nh->nh_exceptions); |
4895c771 DM |
1254 | struct fib_nh_exception *fnhe; |
1255 | u32 hval; | |
1256 | ||
f2bb4bed DM |
1257 | if (!hash) |
1258 | return NULL; | |
1259 | ||
d3a25c98 | 1260 | hval = fnhe_hashfun(daddr); |
4895c771 DM |
1261 | |
1262 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; | |
1263 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
f2bb4bed DM |
1264 | if (fnhe->fnhe_daddr == daddr) |
1265 | return fnhe; | |
1266 | } | |
1267 | return NULL; | |
1268 | } | |
aee06da6 | 1269 | |
caacf05e | 1270 | static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, |
f2bb4bed DM |
1271 | __be32 daddr) |
1272 | { | |
caacf05e DM |
1273 | bool ret = false; |
1274 | ||
c5038a83 | 1275 | spin_lock_bh(&fnhe_lock); |
f2bb4bed | 1276 | |
c5038a83 | 1277 | if (daddr == fnhe->fnhe_daddr) { |
2ffae99d TT |
1278 | struct rtable __rcu **porig; |
1279 | struct rtable *orig; | |
5aad1de5 | 1280 | int genid = fnhe_genid(dev_net(rt->dst.dev)); |
2ffae99d TT |
1281 | |
1282 | if (rt_is_input_route(rt)) | |
1283 | porig = &fnhe->fnhe_rth_input; | |
1284 | else | |
1285 | porig = &fnhe->fnhe_rth_output; | |
1286 | orig = rcu_dereference(*porig); | |
5aad1de5 TT |
1287 | |
1288 | if (fnhe->fnhe_genid != genid) { | |
1289 | fnhe->fnhe_genid = genid; | |
13d82bf5 SK |
1290 | fnhe->fnhe_gw = 0; |
1291 | fnhe->fnhe_pmtu = 0; | |
1292 | fnhe->fnhe_expires = 0; | |
2ffae99d TT |
1293 | fnhe_flush_routes(fnhe); |
1294 | orig = NULL; | |
13d82bf5 | 1295 | } |
387aa65a TT |
1296 | fill_route_from_fnhe(rt, fnhe); |
1297 | if (!rt->rt_gateway) | |
155e8336 | 1298 | rt->rt_gateway = daddr; |
f2bb4bed | 1299 | |
2ffae99d TT |
1300 | if (!(rt->dst.flags & DST_NOCACHE)) { |
1301 | rcu_assign_pointer(*porig, rt); | |
1302 | if (orig) | |
1303 | rt_free(orig); | |
1304 | ret = true; | |
1305 | } | |
c5038a83 DM |
1306 | |
1307 | fnhe->fnhe_stamp = jiffies; | |
c5038a83 DM |
1308 | } |
1309 | spin_unlock_bh(&fnhe_lock); | |
caacf05e DM |
1310 | |
1311 | return ret; | |
54764bb6 ED |
1312 | } |
1313 | ||
caacf05e | 1314 | static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt) |
f2bb4bed | 1315 | { |
d26b3a7c | 1316 | struct rtable *orig, *prev, **p; |
caacf05e | 1317 | bool ret = true; |
f2bb4bed | 1318 | |
d26b3a7c | 1319 | if (rt_is_input_route(rt)) { |
54764bb6 | 1320 | p = (struct rtable **)&nh->nh_rth_input; |
d26b3a7c | 1321 | } else { |
903ceff7 | 1322 | p = (struct rtable **)raw_cpu_ptr(nh->nh_pcpu_rth_output); |
d26b3a7c | 1323 | } |
f2bb4bed DM |
1324 | orig = *p; |
1325 | ||
1326 | prev = cmpxchg(p, orig, rt); | |
1327 | if (prev == orig) { | |
f2bb4bed | 1328 | if (orig) |
54764bb6 | 1329 | rt_free(orig); |
155e8336 | 1330 | } else |
caacf05e | 1331 | ret = false; |
caacf05e DM |
1332 | |
1333 | return ret; | |
1334 | } | |
1335 | ||
5055c371 ED |
1336 | struct uncached_list { |
1337 | spinlock_t lock; | |
1338 | struct list_head head; | |
1339 | }; | |
1340 | ||
1341 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt_uncached_list); | |
caacf05e DM |
1342 | |
1343 | static void rt_add_uncached_list(struct rtable *rt) | |
1344 | { | |
5055c371 ED |
1345 | struct uncached_list *ul = raw_cpu_ptr(&rt_uncached_list); |
1346 | ||
1347 | rt->rt_uncached_list = ul; | |
1348 | ||
1349 | spin_lock_bh(&ul->lock); | |
1350 | list_add_tail(&rt->rt_uncached, &ul->head); | |
1351 | spin_unlock_bh(&ul->lock); | |
caacf05e DM |
1352 | } |
1353 | ||
1354 | static void ipv4_dst_destroy(struct dst_entry *dst) | |
1355 | { | |
1356 | struct rtable *rt = (struct rtable *) dst; | |
1357 | ||
78df76a0 | 1358 | if (!list_empty(&rt->rt_uncached)) { |
5055c371 ED |
1359 | struct uncached_list *ul = rt->rt_uncached_list; |
1360 | ||
1361 | spin_lock_bh(&ul->lock); | |
caacf05e | 1362 | list_del(&rt->rt_uncached); |
5055c371 | 1363 | spin_unlock_bh(&ul->lock); |
caacf05e DM |
1364 | } |
1365 | } | |
1366 | ||
1367 | void rt_flush_dev(struct net_device *dev) | |
1368 | { | |
5055c371 ED |
1369 | struct net *net = dev_net(dev); |
1370 | struct rtable *rt; | |
1371 | int cpu; | |
1372 | ||
1373 | for_each_possible_cpu(cpu) { | |
1374 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
caacf05e | 1375 | |
5055c371 ED |
1376 | spin_lock_bh(&ul->lock); |
1377 | list_for_each_entry(rt, &ul->head, rt_uncached) { | |
caacf05e DM |
1378 | if (rt->dst.dev != dev) |
1379 | continue; | |
1380 | rt->dst.dev = net->loopback_dev; | |
1381 | dev_hold(rt->dst.dev); | |
1382 | dev_put(dev); | |
1383 | } | |
5055c371 | 1384 | spin_unlock_bh(&ul->lock); |
4895c771 DM |
1385 | } |
1386 | } | |
1387 | ||
4331debc | 1388 | static bool rt_cache_valid(const struct rtable *rt) |
d2d68ba9 | 1389 | { |
4331debc ED |
1390 | return rt && |
1391 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1392 | !rt_is_expired(rt); | |
d2d68ba9 DM |
1393 | } |
1394 | ||
f2bb4bed | 1395 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
5e2b61f7 | 1396 | const struct fib_result *res, |
f2bb4bed | 1397 | struct fib_nh_exception *fnhe, |
982721f3 | 1398 | struct fib_info *fi, u16 type, u32 itag) |
1da177e4 | 1399 | { |
caacf05e DM |
1400 | bool cached = false; |
1401 | ||
1da177e4 | 1402 | if (fi) { |
4895c771 DM |
1403 | struct fib_nh *nh = &FIB_RES_NH(*res); |
1404 | ||
155e8336 | 1405 | if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) { |
4895c771 | 1406 | rt->rt_gateway = nh->nh_gw; |
155e8336 JA |
1407 | rt->rt_uses_gateway = 1; |
1408 | } | |
2860583f | 1409 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
c7066f70 | 1410 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f2bb4bed | 1411 | rt->dst.tclassid = nh->nh_tclassid; |
1da177e4 | 1412 | #endif |
61adedf3 | 1413 | rt->dst.lwtstate = lwtstate_get(nh->nh_lwtstate); |
c5038a83 | 1414 | if (unlikely(fnhe)) |
caacf05e | 1415 | cached = rt_bind_exception(rt, fnhe, daddr); |
c5038a83 | 1416 | else if (!(rt->dst.flags & DST_NOCACHE)) |
caacf05e | 1417 | cached = rt_cache_route(nh, rt); |
155e8336 JA |
1418 | if (unlikely(!cached)) { |
1419 | /* Routes we intend to cache in nexthop exception or | |
1420 | * FIB nexthop have the DST_NOCACHE bit clear. | |
1421 | * However, if we are unsuccessful at storing this | |
1422 | * route into the cache we really need to set it. | |
1423 | */ | |
1424 | rt->dst.flags |= DST_NOCACHE; | |
1425 | if (!rt->rt_gateway) | |
1426 | rt->rt_gateway = daddr; | |
1427 | rt_add_uncached_list(rt); | |
1428 | } | |
1429 | } else | |
caacf05e | 1430 | rt_add_uncached_list(rt); |
defb3519 | 1431 | |
c7066f70 | 1432 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 | 1433 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
85b91b03 | 1434 | set_class_tag(rt, res->tclassid); |
1da177e4 LT |
1435 | #endif |
1436 | set_class_tag(rt, itag); | |
1437 | #endif | |
1da177e4 LT |
1438 | } |
1439 | ||
5c1e6aa3 | 1440 | static struct rtable *rt_dst_alloc(struct net_device *dev, |
f2bb4bed | 1441 | bool nopolicy, bool noxfrm, bool will_cache) |
0c4dcd58 | 1442 | { |
f5b0a874 | 1443 | return dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, |
c6cffba4 | 1444 | (will_cache ? 0 : (DST_HOST | DST_NOCACHE)) | |
5c1e6aa3 DM |
1445 | (nopolicy ? DST_NOPOLICY : 0) | |
1446 | (noxfrm ? DST_NOXFRM : 0)); | |
0c4dcd58 DM |
1447 | } |
1448 | ||
96d36220 | 1449 | /* called in rcu_read_lock() section */ |
9e12bb22 | 1450 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1da177e4 LT |
1451 | u8 tos, struct net_device *dev, int our) |
1452 | { | |
1da177e4 | 1453 | struct rtable *rth; |
96d36220 | 1454 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 1455 | u32 itag = 0; |
b5f7e755 | 1456 | int err; |
1da177e4 LT |
1457 | |
1458 | /* Primary sanity checks. */ | |
1459 | ||
51456b29 | 1460 | if (!in_dev) |
1da177e4 LT |
1461 | return -EINVAL; |
1462 | ||
1e637c74 | 1463 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
d0daebc3 | 1464 | skb->protocol != htons(ETH_P_IP)) |
1da177e4 LT |
1465 | goto e_inval; |
1466 | ||
d0daebc3 TG |
1467 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
1468 | if (ipv4_is_loopback(saddr)) | |
1469 | goto e_inval; | |
1470 | ||
f97c1e0c JP |
1471 | if (ipv4_is_zeronet(saddr)) { |
1472 | if (!ipv4_is_local_multicast(daddr)) | |
1da177e4 | 1473 | goto e_inval; |
b5f7e755 | 1474 | } else { |
9e56e380 DM |
1475 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
1476 | in_dev, &itag); | |
b5f7e755 ED |
1477 | if (err < 0) |
1478 | goto e_err; | |
1479 | } | |
4e7b2f14 | 1480 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, |
f2bb4bed | 1481 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); |
1da177e4 LT |
1482 | if (!rth) |
1483 | goto e_nobufs; | |
1484 | ||
cf911662 DM |
1485 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1486 | rth->dst.tclassid = itag; | |
1487 | #endif | |
d8d1f30b | 1488 | rth->dst.output = ip_rt_bug; |
1da177e4 | 1489 | |
ca4c3fc2 | 1490 | rth->rt_genid = rt_genid_ipv4(dev_net(dev)); |
cf911662 DM |
1491 | rth->rt_flags = RTCF_MULTICAST; |
1492 | rth->rt_type = RTN_MULTICAST; | |
9917e1e8 | 1493 | rth->rt_is_input= 1; |
13378cad | 1494 | rth->rt_iif = 0; |
5943634f | 1495 | rth->rt_pmtu = 0; |
f8126f1d | 1496 | rth->rt_gateway = 0; |
155e8336 | 1497 | rth->rt_uses_gateway = 0; |
caacf05e | 1498 | INIT_LIST_HEAD(&rth->rt_uncached); |
1da177e4 | 1499 | if (our) { |
d8d1f30b | 1500 | rth->dst.input= ip_local_deliver; |
1da177e4 LT |
1501 | rth->rt_flags |= RTCF_LOCAL; |
1502 | } | |
1503 | ||
1504 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1505 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1506 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1507 | #endif |
1508 | RT_CACHE_STAT_INC(in_slow_mc); | |
1509 | ||
89aef892 DM |
1510 | skb_dst_set(skb, &rth->dst); |
1511 | return 0; | |
1da177e4 LT |
1512 | |
1513 | e_nobufs: | |
1da177e4 | 1514 | return -ENOBUFS; |
1da177e4 | 1515 | e_inval: |
96d36220 | 1516 | return -EINVAL; |
b5f7e755 | 1517 | e_err: |
b5f7e755 | 1518 | return err; |
1da177e4 LT |
1519 | } |
1520 | ||
1521 | ||
1522 | static void ip_handle_martian_source(struct net_device *dev, | |
1523 | struct in_device *in_dev, | |
1524 | struct sk_buff *skb, | |
9e12bb22 AV |
1525 | __be32 daddr, |
1526 | __be32 saddr) | |
1da177e4 LT |
1527 | { |
1528 | RT_CACHE_STAT_INC(in_martian_src); | |
1529 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1530 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1531 | /* | |
1532 | * RFC1812 recommendation, if source is martian, | |
1533 | * the only hint is MAC header. | |
1534 | */ | |
058bd4d2 | 1535 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
673d57e7 | 1536 | &daddr, &saddr, dev->name); |
98e399f8 | 1537 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
058bd4d2 JP |
1538 | print_hex_dump(KERN_WARNING, "ll header: ", |
1539 | DUMP_PREFIX_OFFSET, 16, 1, | |
1540 | skb_mac_header(skb), | |
1541 | dev->hard_header_len, true); | |
1da177e4 LT |
1542 | } |
1543 | } | |
1544 | #endif | |
1545 | } | |
1546 | ||
47360228 | 1547 | /* called in rcu_read_lock() section */ |
5969f71d | 1548 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1549 | const struct fib_result *res, |
5969f71d | 1550 | struct in_device *in_dev, |
c6cffba4 | 1551 | __be32 daddr, __be32 saddr, u32 tos) |
1da177e4 | 1552 | { |
2ffae99d | 1553 | struct fib_nh_exception *fnhe; |
1da177e4 LT |
1554 | struct rtable *rth; |
1555 | int err; | |
1556 | struct in_device *out_dev; | |
d2d68ba9 | 1557 | bool do_cache; |
fbdc0ad0 | 1558 | u32 itag = 0; |
1da177e4 LT |
1559 | |
1560 | /* get a working reference to the output device */ | |
47360228 | 1561 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
51456b29 | 1562 | if (!out_dev) { |
e87cc472 | 1563 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
1da177e4 LT |
1564 | return -EINVAL; |
1565 | } | |
1566 | ||
5c04c819 | 1567 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
9e56e380 | 1568 | in_dev->dev, in_dev, &itag); |
1da177e4 | 1569 | if (err < 0) { |
e905a9ed | 1570 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1571 | saddr); |
e905a9ed | 1572 | |
1da177e4 LT |
1573 | goto cleanup; |
1574 | } | |
1575 | ||
e81da0e1 JA |
1576 | do_cache = res->fi && !itag; |
1577 | if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) && | |
df4d9254 | 1578 | skb->protocol == htons(ETH_P_IP) && |
1da177e4 | 1579 | (IN_DEV_SHARED_MEDIA(out_dev) || |
df4d9254 HFS |
1580 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) |
1581 | IPCB(skb)->flags |= IPSKB_DOREDIRECT; | |
1da177e4 LT |
1582 | |
1583 | if (skb->protocol != htons(ETH_P_IP)) { | |
1584 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1585 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1586 | * |
1587 | * Proxy arp feature have been extended to allow, ARP | |
1588 | * replies back to the same interface, to support | |
1589 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1590 | */ |
65324144 JDB |
1591 | if (out_dev == in_dev && |
1592 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1593 | err = -EINVAL; |
1594 | goto cleanup; | |
1595 | } | |
1596 | } | |
1597 | ||
2ffae99d | 1598 | fnhe = find_exception(&FIB_RES_NH(*res), daddr); |
e81da0e1 | 1599 | if (do_cache) { |
00db4124 | 1600 | if (fnhe) |
2ffae99d TT |
1601 | rth = rcu_dereference(fnhe->fnhe_rth_input); |
1602 | else | |
1603 | rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); | |
1604 | ||
e81da0e1 JA |
1605 | if (rt_cache_valid(rth)) { |
1606 | skb_dst_set_noref(skb, &rth->dst); | |
1607 | goto out; | |
d2d68ba9 DM |
1608 | } |
1609 | } | |
f2bb4bed | 1610 | |
5c1e6aa3 DM |
1611 | rth = rt_dst_alloc(out_dev->dev, |
1612 | IN_DEV_CONF_GET(in_dev, NOPOLICY), | |
d2d68ba9 | 1613 | IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); |
1da177e4 LT |
1614 | if (!rth) { |
1615 | err = -ENOBUFS; | |
1616 | goto cleanup; | |
1617 | } | |
1618 | ||
ca4c3fc2 | 1619 | rth->rt_genid = rt_genid_ipv4(dev_net(rth->dst.dev)); |
cb1c6168 | 1620 | rth->rt_flags = 0; |
cf911662 | 1621 | rth->rt_type = res->type; |
9917e1e8 | 1622 | rth->rt_is_input = 1; |
13378cad | 1623 | rth->rt_iif = 0; |
5943634f | 1624 | rth->rt_pmtu = 0; |
f8126f1d | 1625 | rth->rt_gateway = 0; |
155e8336 | 1626 | rth->rt_uses_gateway = 0; |
caacf05e | 1627 | INIT_LIST_HEAD(&rth->rt_uncached); |
a6254864 | 1628 | RT_CACHE_STAT_INC(in_slow_tot); |
1da177e4 | 1629 | |
d8d1f30b CG |
1630 | rth->dst.input = ip_forward; |
1631 | rth->dst.output = ip_output; | |
1da177e4 | 1632 | |
2ffae99d | 1633 | rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag); |
61adedf3 JB |
1634 | if (lwtunnel_output_redirect(rth->dst.lwtstate)) { |
1635 | rth->dst.lwtstate->orig_output = rth->dst.output; | |
8602a625 | 1636 | rth->dst.output = lwtunnel_output; |
25368623 | 1637 | } |
61adedf3 JB |
1638 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { |
1639 | rth->dst.lwtstate->orig_input = rth->dst.input; | |
25368623 TH |
1640 | rth->dst.input = lwtunnel_input; |
1641 | } | |
c6cffba4 | 1642 | skb_dst_set(skb, &rth->dst); |
d2d68ba9 | 1643 | out: |
1da177e4 LT |
1644 | err = 0; |
1645 | cleanup: | |
1da177e4 | 1646 | return err; |
e905a9ed | 1647 | } |
1da177e4 | 1648 | |
5969f71d SH |
1649 | static int ip_mkroute_input(struct sk_buff *skb, |
1650 | struct fib_result *res, | |
68a5e3dd | 1651 | const struct flowi4 *fl4, |
5969f71d SH |
1652 | struct in_device *in_dev, |
1653 | __be32 daddr, __be32 saddr, u32 tos) | |
1da177e4 | 1654 | { |
1da177e4 | 1655 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
ff3fccb3 | 1656 | if (res->fi && res->fi->fib_nhs > 1) |
1b7fe593 | 1657 | fib_select_multipath(res); |
1da177e4 LT |
1658 | #endif |
1659 | ||
1660 | /* create a routing cache entry */ | |
c6cffba4 | 1661 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
1da177e4 LT |
1662 | } |
1663 | ||
1da177e4 LT |
1664 | /* |
1665 | * NOTE. We drop all the packets that has local source | |
1666 | * addresses, because every properly looped back packet | |
1667 | * must have correct destination already attached by output routine. | |
1668 | * | |
1669 | * Such approach solves two big problems: | |
1670 | * 1. Not simplex devices are handled properly. | |
1671 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 1672 | * called with rcu_read_lock() |
1da177e4 LT |
1673 | */ |
1674 | ||
9e12bb22 | 1675 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
c10237e0 | 1676 | u8 tos, struct net_device *dev) |
1da177e4 LT |
1677 | { |
1678 | struct fib_result res; | |
96d36220 | 1679 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1b7179d3 | 1680 | struct ip_tunnel_info *tun_info; |
68a5e3dd | 1681 | struct flowi4 fl4; |
95c96174 | 1682 | unsigned int flags = 0; |
1da177e4 | 1683 | u32 itag = 0; |
95c96174 | 1684 | struct rtable *rth; |
1da177e4 | 1685 | int err = -EINVAL; |
5e73ea1a | 1686 | struct net *net = dev_net(dev); |
d2d68ba9 | 1687 | bool do_cache; |
1da177e4 LT |
1688 | |
1689 | /* IP on this device is disabled. */ | |
1690 | ||
1691 | if (!in_dev) | |
1692 | goto out; | |
1693 | ||
1694 | /* Check for the most weird martians, which can be not detected | |
1695 | by fib_lookup. | |
1696 | */ | |
1697 | ||
61adedf3 | 1698 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1699 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
1b7179d3 TG |
1700 | fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id; |
1701 | else | |
1702 | fl4.flowi4_tun_key.tun_id = 0; | |
f38a9eb1 TG |
1703 | skb_dst_drop(skb); |
1704 | ||
d0daebc3 | 1705 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
1da177e4 LT |
1706 | goto martian_source; |
1707 | ||
d2d68ba9 | 1708 | res.fi = NULL; |
27a954bd | 1709 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
1710 | goto brd_input; |
1711 | ||
1712 | /* Accept zero addresses only to limited broadcast; | |
1713 | * I even do not know to fix it or not. Waiting for complains :-) | |
1714 | */ | |
f97c1e0c | 1715 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
1716 | goto martian_source; |
1717 | ||
d0daebc3 | 1718 | if (ipv4_is_zeronet(daddr)) |
1da177e4 LT |
1719 | goto martian_destination; |
1720 | ||
9eb43e76 ED |
1721 | /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), |
1722 | * and call it once if daddr or/and saddr are loopback addresses | |
1723 | */ | |
1724 | if (ipv4_is_loopback(daddr)) { | |
1725 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 | 1726 | goto martian_destination; |
9eb43e76 ED |
1727 | } else if (ipv4_is_loopback(saddr)) { |
1728 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 TG |
1729 | goto martian_source; |
1730 | } | |
1731 | ||
1da177e4 LT |
1732 | /* |
1733 | * Now we are ready to route packet. | |
1734 | */ | |
68a5e3dd | 1735 | fl4.flowi4_oif = 0; |
cd2fbe1b | 1736 | fl4.flowi4_iif = vrf_master_ifindex_rcu(dev) ? : dev->ifindex; |
68a5e3dd DM |
1737 | fl4.flowi4_mark = skb->mark; |
1738 | fl4.flowi4_tos = tos; | |
1739 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1740 | fl4.daddr = daddr; | |
1741 | fl4.saddr = saddr; | |
0eeb075f | 1742 | err = fib_lookup(net, &fl4, &res, 0); |
cd0f0b95 DJ |
1743 | if (err != 0) { |
1744 | if (!IN_DEV_FORWARD(in_dev)) | |
1745 | err = -EHOSTUNREACH; | |
1da177e4 | 1746 | goto no_route; |
cd0f0b95 | 1747 | } |
1da177e4 LT |
1748 | |
1749 | if (res.type == RTN_BROADCAST) | |
1750 | goto brd_input; | |
1751 | ||
1752 | if (res.type == RTN_LOCAL) { | |
5c04c819 | 1753 | err = fib_validate_source(skb, saddr, daddr, tos, |
0d5edc68 | 1754 | 0, dev, in_dev, &itag); |
b5f7e755 ED |
1755 | if (err < 0) |
1756 | goto martian_source_keep_err; | |
1da177e4 LT |
1757 | goto local_input; |
1758 | } | |
1759 | ||
cd0f0b95 DJ |
1760 | if (!IN_DEV_FORWARD(in_dev)) { |
1761 | err = -EHOSTUNREACH; | |
251da413 | 1762 | goto no_route; |
cd0f0b95 | 1763 | } |
1da177e4 LT |
1764 | if (res.type != RTN_UNICAST) |
1765 | goto martian_destination; | |
1766 | ||
68a5e3dd | 1767 | err = ip_mkroute_input(skb, &res, &fl4, in_dev, daddr, saddr, tos); |
1da177e4 LT |
1768 | out: return err; |
1769 | ||
1770 | brd_input: | |
1771 | if (skb->protocol != htons(ETH_P_IP)) | |
1772 | goto e_inval; | |
1773 | ||
41347dcd | 1774 | if (!ipv4_is_zeronet(saddr)) { |
9e56e380 DM |
1775 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
1776 | in_dev, &itag); | |
1da177e4 | 1777 | if (err < 0) |
b5f7e755 | 1778 | goto martian_source_keep_err; |
1da177e4 LT |
1779 | } |
1780 | flags |= RTCF_BROADCAST; | |
1781 | res.type = RTN_BROADCAST; | |
1782 | RT_CACHE_STAT_INC(in_brd); | |
1783 | ||
1784 | local_input: | |
d2d68ba9 DM |
1785 | do_cache = false; |
1786 | if (res.fi) { | |
fe3edf45 | 1787 | if (!itag) { |
54764bb6 | 1788 | rth = rcu_dereference(FIB_RES_NH(res).nh_rth_input); |
d2d68ba9 | 1789 | if (rt_cache_valid(rth)) { |
c6cffba4 DM |
1790 | skb_dst_set_noref(skb, &rth->dst); |
1791 | err = 0; | |
1792 | goto out; | |
d2d68ba9 DM |
1793 | } |
1794 | do_cache = true; | |
1795 | } | |
1796 | } | |
1797 | ||
5c1e6aa3 | 1798 | rth = rt_dst_alloc(net->loopback_dev, |
d2d68ba9 | 1799 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); |
1da177e4 LT |
1800 | if (!rth) |
1801 | goto e_nobufs; | |
1802 | ||
cf911662 | 1803 | rth->dst.input= ip_local_deliver; |
d8d1f30b | 1804 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
1805 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1806 | rth->dst.tclassid = itag; | |
1807 | #endif | |
1da177e4 | 1808 | |
ca4c3fc2 | 1809 | rth->rt_genid = rt_genid_ipv4(net); |
cf911662 DM |
1810 | rth->rt_flags = flags|RTCF_LOCAL; |
1811 | rth->rt_type = res.type; | |
9917e1e8 | 1812 | rth->rt_is_input = 1; |
13378cad | 1813 | rth->rt_iif = 0; |
5943634f | 1814 | rth->rt_pmtu = 0; |
f8126f1d | 1815 | rth->rt_gateway = 0; |
155e8336 | 1816 | rth->rt_uses_gateway = 0; |
caacf05e | 1817 | INIT_LIST_HEAD(&rth->rt_uncached); |
571e7226 | 1818 | |
a6254864 | 1819 | RT_CACHE_STAT_INC(in_slow_tot); |
1da177e4 | 1820 | if (res.type == RTN_UNREACHABLE) { |
d8d1f30b CG |
1821 | rth->dst.input= ip_error; |
1822 | rth->dst.error= -err; | |
1da177e4 LT |
1823 | rth->rt_flags &= ~RTCF_LOCAL; |
1824 | } | |
dcdfdf56 AS |
1825 | if (do_cache) { |
1826 | if (unlikely(!rt_cache_route(&FIB_RES_NH(res), rth))) { | |
1827 | rth->dst.flags |= DST_NOCACHE; | |
1828 | rt_add_uncached_list(rth); | |
1829 | } | |
1830 | } | |
89aef892 | 1831 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 1832 | err = 0; |
ebc0ffae | 1833 | goto out; |
1da177e4 LT |
1834 | |
1835 | no_route: | |
1836 | RT_CACHE_STAT_INC(in_no_route); | |
1da177e4 | 1837 | res.type = RTN_UNREACHABLE; |
fa19c2b0 | 1838 | res.fi = NULL; |
1da177e4 LT |
1839 | goto local_input; |
1840 | ||
1841 | /* | |
1842 | * Do not cache martian addresses: they should be logged (RFC1812) | |
1843 | */ | |
1844 | martian_destination: | |
1845 | RT_CACHE_STAT_INC(in_martian_dst); | |
1846 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
e87cc472 JP |
1847 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
1848 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", | |
1849 | &daddr, &saddr, dev->name); | |
1da177e4 | 1850 | #endif |
2c2910a4 | 1851 | |
1da177e4 LT |
1852 | e_inval: |
1853 | err = -EINVAL; | |
ebc0ffae | 1854 | goto out; |
1da177e4 LT |
1855 | |
1856 | e_nobufs: | |
1857 | err = -ENOBUFS; | |
ebc0ffae | 1858 | goto out; |
1da177e4 LT |
1859 | |
1860 | martian_source: | |
b5f7e755 ED |
1861 | err = -EINVAL; |
1862 | martian_source_keep_err: | |
1da177e4 | 1863 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
ebc0ffae | 1864 | goto out; |
1da177e4 LT |
1865 | } |
1866 | ||
c6cffba4 DM |
1867 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1868 | u8 tos, struct net_device *dev) | |
1da177e4 | 1869 | { |
96d36220 | 1870 | int res; |
1da177e4 | 1871 | |
96d36220 ED |
1872 | rcu_read_lock(); |
1873 | ||
1da177e4 LT |
1874 | /* Multicast recognition logic is moved from route cache to here. |
1875 | The problem was that too many Ethernet cards have broken/missing | |
1876 | hardware multicast filters :-( As result the host on multicasting | |
1877 | network acquires a lot of useless route cache entries, sort of | |
1878 | SDR messages from all the world. Now we try to get rid of them. | |
1879 | Really, provided software IP multicast filter is organized | |
1880 | reasonably (at least, hashed), it does not result in a slowdown | |
1881 | comparing with route cache reject entries. | |
1882 | Note, that multicast routers are not affected, because | |
1883 | route cache entry is created eventually. | |
1884 | */ | |
f97c1e0c | 1885 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 1886 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 | 1887 | |
96d36220 | 1888 | if (in_dev) { |
dbdd9a52 DM |
1889 | int our = ip_check_mc_rcu(in_dev, daddr, saddr, |
1890 | ip_hdr(skb)->protocol); | |
1da177e4 LT |
1891 | if (our |
1892 | #ifdef CONFIG_IP_MROUTE | |
9d4fb27d JP |
1893 | || |
1894 | (!ipv4_is_local_multicast(daddr) && | |
1895 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 1896 | #endif |
9d4fb27d | 1897 | ) { |
96d36220 ED |
1898 | int res = ip_route_input_mc(skb, daddr, saddr, |
1899 | tos, dev, our); | |
1da177e4 | 1900 | rcu_read_unlock(); |
96d36220 | 1901 | return res; |
1da177e4 LT |
1902 | } |
1903 | } | |
1904 | rcu_read_unlock(); | |
1905 | return -EINVAL; | |
1906 | } | |
c10237e0 | 1907 | res = ip_route_input_slow(skb, daddr, saddr, tos, dev); |
96d36220 ED |
1908 | rcu_read_unlock(); |
1909 | return res; | |
1da177e4 | 1910 | } |
c6cffba4 | 1911 | EXPORT_SYMBOL(ip_route_input_noref); |
1da177e4 | 1912 | |
ebc0ffae | 1913 | /* called with rcu_read_lock() */ |
982721f3 | 1914 | static struct rtable *__mkroute_output(const struct fib_result *res, |
1a00fee4 | 1915 | const struct flowi4 *fl4, int orig_oif, |
f61759e6 | 1916 | struct net_device *dev_out, |
5ada5527 | 1917 | unsigned int flags) |
1da177e4 | 1918 | { |
982721f3 | 1919 | struct fib_info *fi = res->fi; |
f2bb4bed | 1920 | struct fib_nh_exception *fnhe; |
5ada5527 | 1921 | struct in_device *in_dev; |
982721f3 | 1922 | u16 type = res->type; |
5ada5527 | 1923 | struct rtable *rth; |
c92b9655 | 1924 | bool do_cache; |
1da177e4 | 1925 | |
d0daebc3 TG |
1926 | in_dev = __in_dev_get_rcu(dev_out); |
1927 | if (!in_dev) | |
5ada5527 | 1928 | return ERR_PTR(-EINVAL); |
1da177e4 | 1929 | |
d0daebc3 TG |
1930 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
1931 | if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK)) | |
1932 | return ERR_PTR(-EINVAL); | |
1933 | ||
68a5e3dd | 1934 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 1935 | type = RTN_BROADCAST; |
68a5e3dd | 1936 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 1937 | type = RTN_MULTICAST; |
68a5e3dd | 1938 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 1939 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1940 | |
1941 | if (dev_out->flags & IFF_LOOPBACK) | |
1942 | flags |= RTCF_LOCAL; | |
1943 | ||
63617421 | 1944 | do_cache = true; |
982721f3 | 1945 | if (type == RTN_BROADCAST) { |
1da177e4 | 1946 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
1947 | fi = NULL; |
1948 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 1949 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
1950 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
1951 | fl4->flowi4_proto)) | |
1da177e4 | 1952 | flags &= ~RTCF_LOCAL; |
63617421 JA |
1953 | else |
1954 | do_cache = false; | |
1da177e4 | 1955 | /* If multicast route do not exist use |
dd28d1a0 ED |
1956 | * default one, but do not gateway in this case. |
1957 | * Yes, it is hack. | |
1da177e4 | 1958 | */ |
982721f3 DM |
1959 | if (fi && res->prefixlen < 4) |
1960 | fi = NULL; | |
1da177e4 LT |
1961 | } |
1962 | ||
f2bb4bed | 1963 | fnhe = NULL; |
63617421 JA |
1964 | do_cache &= fi != NULL; |
1965 | if (do_cache) { | |
c5038a83 | 1966 | struct rtable __rcu **prth; |
c92b9655 | 1967 | struct fib_nh *nh = &FIB_RES_NH(*res); |
d26b3a7c | 1968 | |
c92b9655 | 1969 | fnhe = find_exception(nh, fl4->daddr); |
c5038a83 | 1970 | if (fnhe) |
2ffae99d | 1971 | prth = &fnhe->fnhe_rth_output; |
c92b9655 JA |
1972 | else { |
1973 | if (unlikely(fl4->flowi4_flags & | |
1974 | FLOWI_FLAG_KNOWN_NH && | |
1975 | !(nh->nh_gw && | |
1976 | nh->nh_scope == RT_SCOPE_LINK))) { | |
1977 | do_cache = false; | |
1978 | goto add; | |
1979 | } | |
903ceff7 | 1980 | prth = raw_cpu_ptr(nh->nh_pcpu_rth_output); |
c92b9655 | 1981 | } |
c5038a83 DM |
1982 | rth = rcu_dereference(*prth); |
1983 | if (rt_cache_valid(rth)) { | |
1984 | dst_hold(&rth->dst); | |
1985 | return rth; | |
f2bb4bed DM |
1986 | } |
1987 | } | |
c92b9655 JA |
1988 | |
1989 | add: | |
5c1e6aa3 DM |
1990 | rth = rt_dst_alloc(dev_out, |
1991 | IN_DEV_CONF_GET(in_dev, NOPOLICY), | |
f2bb4bed | 1992 | IN_DEV_CONF_GET(in_dev, NOXFRM), |
c92b9655 | 1993 | do_cache); |
8391d07b | 1994 | if (!rth) |
5ada5527 | 1995 | return ERR_PTR(-ENOBUFS); |
8391d07b | 1996 | |
cf911662 DM |
1997 | rth->dst.output = ip_output; |
1998 | ||
ca4c3fc2 | 1999 | rth->rt_genid = rt_genid_ipv4(dev_net(dev_out)); |
cf911662 DM |
2000 | rth->rt_flags = flags; |
2001 | rth->rt_type = type; | |
9917e1e8 | 2002 | rth->rt_is_input = 0; |
13378cad | 2003 | rth->rt_iif = orig_oif ? : 0; |
5943634f | 2004 | rth->rt_pmtu = 0; |
f8126f1d | 2005 | rth->rt_gateway = 0; |
155e8336 | 2006 | rth->rt_uses_gateway = 0; |
caacf05e | 2007 | INIT_LIST_HEAD(&rth->rt_uncached); |
1da177e4 LT |
2008 | RT_CACHE_STAT_INC(out_slow_tot); |
2009 | ||
41347dcd | 2010 | if (flags & RTCF_LOCAL) |
d8d1f30b | 2011 | rth->dst.input = ip_local_deliver; |
1da177e4 | 2012 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
e905a9ed | 2013 | if (flags & RTCF_LOCAL && |
1da177e4 | 2014 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 2015 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
2016 | RT_CACHE_STAT_INC(out_slow_mc); |
2017 | } | |
2018 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 2019 | if (type == RTN_MULTICAST) { |
1da177e4 | 2020 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 2021 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
2022 | rth->dst.input = ip_mr_input; |
2023 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
2024 | } |
2025 | } | |
2026 | #endif | |
2027 | } | |
2028 | ||
f2bb4bed | 2029 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0); |
61adedf3 | 2030 | if (lwtunnel_output_redirect(rth->dst.lwtstate)) |
0335f5b5 | 2031 | rth->dst.output = lwtunnel_output; |
1da177e4 | 2032 | |
5ada5527 | 2033 | return rth; |
1da177e4 LT |
2034 | } |
2035 | ||
1da177e4 LT |
2036 | /* |
2037 | * Major route resolver routine. | |
2038 | */ | |
2039 | ||
89aef892 | 2040 | struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4) |
1da177e4 | 2041 | { |
1da177e4 | 2042 | struct net_device *dev_out = NULL; |
f61759e6 | 2043 | __u8 tos = RT_FL_TOS(fl4); |
813b3b5d DM |
2044 | unsigned int flags = 0; |
2045 | struct fib_result res; | |
5ada5527 | 2046 | struct rtable *rth; |
813b3b5d | 2047 | int orig_oif; |
1da177e4 | 2048 | |
85b91b03 | 2049 | res.tclassid = 0; |
1da177e4 | 2050 | res.fi = NULL; |
8b96d22d | 2051 | res.table = NULL; |
1da177e4 | 2052 | |
813b3b5d DM |
2053 | orig_oif = fl4->flowi4_oif; |
2054 | ||
1fb9489b | 2055 | fl4->flowi4_iif = LOOPBACK_IFINDEX; |
813b3b5d DM |
2056 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
2057 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? | |
2058 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); | |
44713b67 | 2059 | |
010c2708 | 2060 | rcu_read_lock(); |
813b3b5d | 2061 | if (fl4->saddr) { |
b23dd4fe | 2062 | rth = ERR_PTR(-EINVAL); |
813b3b5d DM |
2063 | if (ipv4_is_multicast(fl4->saddr) || |
2064 | ipv4_is_lbcast(fl4->saddr) || | |
2065 | ipv4_is_zeronet(fl4->saddr)) | |
1da177e4 LT |
2066 | goto out; |
2067 | ||
1da177e4 LT |
2068 | /* I removed check for oif == dev_out->oif here. |
2069 | It was wrong for two reasons: | |
1ab35276 DL |
2070 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
2071 | is assigned to multiple interfaces. | |
1da177e4 LT |
2072 | 2. Moreover, we are allowed to send packets with saddr |
2073 | of another iface. --ANK | |
2074 | */ | |
2075 | ||
813b3b5d DM |
2076 | if (fl4->flowi4_oif == 0 && |
2077 | (ipv4_is_multicast(fl4->daddr) || | |
2078 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 2079 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2080 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
51456b29 | 2081 | if (!dev_out) |
a210d01a JA |
2082 | goto out; |
2083 | ||
1da177e4 LT |
2084 | /* Special hack: user can direct multicasts |
2085 | and limited broadcast via necessary interface | |
2086 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2087 | This hack is not just for fun, it allows | |
2088 | vic,vat and friends to work. | |
2089 | They bind socket to loopback, set ttl to zero | |
2090 | and expect that it will work. | |
2091 | From the viewpoint of routing cache they are broken, | |
2092 | because we are not allowed to build multicast path | |
2093 | with loopback source addr (look, routing cache | |
2094 | cannot know, that ttl is zero, so that packet | |
2095 | will not leave this host and route is valid). | |
2096 | Luckily, this hack is good workaround. | |
2097 | */ | |
2098 | ||
813b3b5d | 2099 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2100 | goto make_route; |
2101 | } | |
a210d01a | 2102 | |
813b3b5d | 2103 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 2104 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2105 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 2106 | goto out; |
a210d01a | 2107 | } |
1da177e4 LT |
2108 | } |
2109 | ||
2110 | ||
813b3b5d DM |
2111 | if (fl4->flowi4_oif) { |
2112 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 2113 | rth = ERR_PTR(-ENODEV); |
51456b29 | 2114 | if (!dev_out) |
1da177e4 | 2115 | goto out; |
e5ed6399 HX |
2116 | |
2117 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 2118 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 2119 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
2120 | goto out; |
2121 | } | |
813b3b5d | 2122 | if (ipv4_is_local_multicast(fl4->daddr) || |
6a211654 AL |
2123 | ipv4_is_lbcast(fl4->daddr) || |
2124 | fl4->flowi4_proto == IPPROTO_IGMP) { | |
813b3b5d DM |
2125 | if (!fl4->saddr) |
2126 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2127 | RT_SCOPE_LINK); | |
1da177e4 LT |
2128 | goto make_route; |
2129 | } | |
0a7e2260 | 2130 | if (!fl4->saddr) { |
813b3b5d DM |
2131 | if (ipv4_is_multicast(fl4->daddr)) |
2132 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2133 | fl4->flowi4_scope); | |
2134 | else if (!fl4->daddr) | |
2135 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2136 | RT_SCOPE_HOST); | |
1da177e4 | 2137 | } |
613d09b3 DA |
2138 | if (netif_is_vrf(dev_out) && |
2139 | !(fl4->flowi4_flags & FLOWI_FLAG_VRFSRC)) { | |
2140 | rth = vrf_dev_get_rth(dev_out); | |
2141 | goto out; | |
2142 | } | |
1da177e4 LT |
2143 | } |
2144 | ||
813b3b5d DM |
2145 | if (!fl4->daddr) { |
2146 | fl4->daddr = fl4->saddr; | |
2147 | if (!fl4->daddr) | |
2148 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 2149 | dev_out = net->loopback_dev; |
1fb9489b | 2150 | fl4->flowi4_oif = LOOPBACK_IFINDEX; |
1da177e4 LT |
2151 | res.type = RTN_LOCAL; |
2152 | flags |= RTCF_LOCAL; | |
2153 | goto make_route; | |
2154 | } | |
2155 | ||
0eeb075f | 2156 | if (fib_lookup(net, fl4, &res, 0)) { |
1da177e4 | 2157 | res.fi = NULL; |
8b96d22d | 2158 | res.table = NULL; |
813b3b5d | 2159 | if (fl4->flowi4_oif) { |
1da177e4 LT |
2160 | /* Apparently, routing tables are wrong. Assume, |
2161 | that the destination is on link. | |
2162 | ||
2163 | WHY? DW. | |
2164 | Because we are allowed to send to iface | |
2165 | even if it has NO routes and NO assigned | |
2166 | addresses. When oif is specified, routing | |
2167 | tables are looked up with only one purpose: | |
2168 | to catch if destination is gatewayed, rather than | |
2169 | direct. Moreover, if MSG_DONTROUTE is set, | |
2170 | we send packet, ignoring both routing tables | |
2171 | and ifaddr state. --ANK | |
2172 | ||
2173 | ||
2174 | We could make it even if oif is unknown, | |
2175 | likely IPv6, but we do not. | |
2176 | */ | |
2177 | ||
813b3b5d DM |
2178 | if (fl4->saddr == 0) |
2179 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2180 | RT_SCOPE_LINK); | |
1da177e4 LT |
2181 | res.type = RTN_UNICAST; |
2182 | goto make_route; | |
2183 | } | |
b23dd4fe | 2184 | rth = ERR_PTR(-ENETUNREACH); |
1da177e4 LT |
2185 | goto out; |
2186 | } | |
1da177e4 LT |
2187 | |
2188 | if (res.type == RTN_LOCAL) { | |
813b3b5d | 2189 | if (!fl4->saddr) { |
9fc3bbb4 | 2190 | if (res.fi->fib_prefsrc) |
813b3b5d | 2191 | fl4->saddr = res.fi->fib_prefsrc; |
9fc3bbb4 | 2192 | else |
813b3b5d | 2193 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 2194 | } |
b40afd0e | 2195 | dev_out = net->loopback_dev; |
813b3b5d | 2196 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2197 | flags |= RTCF_LOCAL; |
2198 | goto make_route; | |
2199 | } | |
2200 | ||
2201 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
813b3b5d | 2202 | if (res.fi->fib_nhs > 1 && fl4->flowi4_oif == 0) |
1b7fe593 | 2203 | fib_select_multipath(&res); |
1da177e4 LT |
2204 | else |
2205 | #endif | |
21d8c49e DM |
2206 | if (!res.prefixlen && |
2207 | res.table->tb_num_default > 1 && | |
813b3b5d | 2208 | res.type == RTN_UNICAST && !fl4->flowi4_oif) |
2392debc | 2209 | fib_select_default(fl4, &res); |
1da177e4 | 2210 | |
813b3b5d DM |
2211 | if (!fl4->saddr) |
2212 | fl4->saddr = FIB_RES_PREFSRC(net, res); | |
1da177e4 | 2213 | |
1da177e4 | 2214 | dev_out = FIB_RES_DEV(res); |
813b3b5d | 2215 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2216 | |
2217 | ||
2218 | make_route: | |
1a00fee4 | 2219 | rth = __mkroute_output(&res, fl4, orig_oif, dev_out, flags); |
1da177e4 | 2220 | |
010c2708 DM |
2221 | out: |
2222 | rcu_read_unlock(); | |
b23dd4fe | 2223 | return rth; |
1da177e4 | 2224 | } |
d8c97a94 ACM |
2225 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
2226 | ||
ae2688d5 JW |
2227 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
2228 | { | |
2229 | return NULL; | |
2230 | } | |
2231 | ||
ebb762f2 | 2232 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 2233 | { |
618f9bc7 SK |
2234 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2235 | ||
2236 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
2237 | } |
2238 | ||
6700c270 DM |
2239 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2240 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
2241 | { |
2242 | } | |
2243 | ||
6700c270 DM |
2244 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
2245 | struct sk_buff *skb) | |
b587ee3b DM |
2246 | { |
2247 | } | |
2248 | ||
0972ddb2 HB |
2249 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
2250 | unsigned long old) | |
2251 | { | |
2252 | return NULL; | |
2253 | } | |
2254 | ||
14e50e57 DM |
2255 | static struct dst_ops ipv4_dst_blackhole_ops = { |
2256 | .family = AF_INET, | |
ae2688d5 | 2257 | .check = ipv4_blackhole_dst_check, |
ebb762f2 | 2258 | .mtu = ipv4_blackhole_mtu, |
214f45c9 | 2259 | .default_advmss = ipv4_default_advmss, |
14e50e57 | 2260 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
b587ee3b | 2261 | .redirect = ipv4_rt_blackhole_redirect, |
0972ddb2 | 2262 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
d3aaeb38 | 2263 | .neigh_lookup = ipv4_neigh_lookup, |
14e50e57 DM |
2264 | }; |
2265 | ||
2774c131 | 2266 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2267 | { |
2774c131 | 2268 | struct rtable *ort = (struct rtable *) dst_orig; |
f5b0a874 | 2269 | struct rtable *rt; |
14e50e57 | 2270 | |
f5b0a874 | 2271 | rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 2272 | if (rt) { |
d8d1f30b | 2273 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2274 | |
14e50e57 | 2275 | new->__use = 1; |
352e512c | 2276 | new->input = dst_discard; |
aad88724 | 2277 | new->output = dst_discard_sk; |
14e50e57 | 2278 | |
d8d1f30b | 2279 | new->dev = ort->dst.dev; |
14e50e57 DM |
2280 | if (new->dev) |
2281 | dev_hold(new->dev); | |
2282 | ||
9917e1e8 | 2283 | rt->rt_is_input = ort->rt_is_input; |
5e2b61f7 | 2284 | rt->rt_iif = ort->rt_iif; |
5943634f | 2285 | rt->rt_pmtu = ort->rt_pmtu; |
14e50e57 | 2286 | |
ca4c3fc2 | 2287 | rt->rt_genid = rt_genid_ipv4(net); |
14e50e57 DM |
2288 | rt->rt_flags = ort->rt_flags; |
2289 | rt->rt_type = ort->rt_type; | |
14e50e57 | 2290 | rt->rt_gateway = ort->rt_gateway; |
155e8336 | 2291 | rt->rt_uses_gateway = ort->rt_uses_gateway; |
14e50e57 | 2292 | |
caacf05e | 2293 | INIT_LIST_HEAD(&rt->rt_uncached); |
14e50e57 DM |
2294 | dst_free(new); |
2295 | } | |
2296 | ||
2774c131 DM |
2297 | dst_release(dst_orig); |
2298 | ||
2299 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2300 | } |
2301 | ||
9d6ec938 | 2302 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
b23dd4fe | 2303 | struct sock *sk) |
1da177e4 | 2304 | { |
9d6ec938 | 2305 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2306 | |
b23dd4fe DM |
2307 | if (IS_ERR(rt)) |
2308 | return rt; | |
1da177e4 | 2309 | |
56157872 | 2310 | if (flp4->flowi4_proto) |
f92ee619 SK |
2311 | rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst, |
2312 | flowi4_to_flowi(flp4), | |
2313 | sk, 0); | |
1da177e4 | 2314 | |
b23dd4fe | 2315 | return rt; |
1da177e4 | 2316 | } |
d8c97a94 ACM |
2317 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2318 | ||
f1ce3062 | 2319 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, |
15e47304 | 2320 | struct flowi4 *fl4, struct sk_buff *skb, u32 portid, |
f1ce3062 | 2321 | u32 seq, int event, int nowait, unsigned int flags) |
1da177e4 | 2322 | { |
511c3f92 | 2323 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 2324 | struct rtmsg *r; |
be403ea1 | 2325 | struct nlmsghdr *nlh; |
2bc8ca40 | 2326 | unsigned long expires = 0; |
f185071d | 2327 | u32 error; |
521f5490 | 2328 | u32 metrics[RTAX_MAX]; |
be403ea1 | 2329 | |
15e47304 | 2330 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags); |
51456b29 | 2331 | if (!nlh) |
26932566 | 2332 | return -EMSGSIZE; |
be403ea1 TG |
2333 | |
2334 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2335 | r->rtm_family = AF_INET; |
2336 | r->rtm_dst_len = 32; | |
2337 | r->rtm_src_len = 0; | |
d6c0a4f6 | 2338 | r->rtm_tos = fl4->flowi4_tos; |
1da177e4 | 2339 | r->rtm_table = RT_TABLE_MAIN; |
f3756b79 DM |
2340 | if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN)) |
2341 | goto nla_put_failure; | |
1da177e4 LT |
2342 | r->rtm_type = rt->rt_type; |
2343 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2344 | r->rtm_protocol = RTPROT_UNSPEC; | |
2345 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2346 | if (rt->rt_flags & RTCF_NOTIFY) | |
2347 | r->rtm_flags |= RTM_F_NOTIFY; | |
df4d9254 HFS |
2348 | if (IPCB(skb)->flags & IPSKB_DOREDIRECT) |
2349 | r->rtm_flags |= RTCF_DOREDIRECT; | |
be403ea1 | 2350 | |
930345ea | 2351 | if (nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 | 2352 | goto nla_put_failure; |
1a00fee4 | 2353 | if (src) { |
1da177e4 | 2354 | r->rtm_src_len = 32; |
930345ea | 2355 | if (nla_put_in_addr(skb, RTA_SRC, src)) |
f3756b79 | 2356 | goto nla_put_failure; |
1da177e4 | 2357 | } |
f3756b79 DM |
2358 | if (rt->dst.dev && |
2359 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2360 | goto nla_put_failure; | |
c7066f70 | 2361 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
2362 | if (rt->dst.tclassid && |
2363 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) | |
2364 | goto nla_put_failure; | |
1da177e4 | 2365 | #endif |
41347dcd | 2366 | if (!rt_is_input_route(rt) && |
d6c0a4f6 | 2367 | fl4->saddr != src) { |
930345ea | 2368 | if (nla_put_in_addr(skb, RTA_PREFSRC, fl4->saddr)) |
f3756b79 DM |
2369 | goto nla_put_failure; |
2370 | } | |
155e8336 | 2371 | if (rt->rt_uses_gateway && |
930345ea | 2372 | nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gateway)) |
f3756b79 | 2373 | goto nla_put_failure; |
be403ea1 | 2374 | |
ee9a8f7a SK |
2375 | expires = rt->dst.expires; |
2376 | if (expires) { | |
2377 | unsigned long now = jiffies; | |
2378 | ||
2379 | if (time_before(now, expires)) | |
2380 | expires -= now; | |
2381 | else | |
2382 | expires = 0; | |
2383 | } | |
2384 | ||
521f5490 | 2385 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
ee9a8f7a | 2386 | if (rt->rt_pmtu && expires) |
521f5490 JA |
2387 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
2388 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
be403ea1 TG |
2389 | goto nla_put_failure; |
2390 | ||
b4869889 | 2391 | if (fl4->flowi4_mark && |
68aaed54 | 2392 | nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark)) |
f3756b79 | 2393 | goto nla_put_failure; |
963bfeee | 2394 | |
d8d1f30b | 2395 | error = rt->dst.error; |
be403ea1 | 2396 | |
c7537967 | 2397 | if (rt_is_input_route(rt)) { |
8caaf7b6 ND |
2398 | #ifdef CONFIG_IP_MROUTE |
2399 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && | |
2400 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { | |
2401 | int err = ipmr_get_route(net, skb, | |
2402 | fl4->saddr, fl4->daddr, | |
2403 | r, nowait); | |
2404 | if (err <= 0) { | |
2405 | if (!nowait) { | |
2406 | if (err == 0) | |
2407 | return 0; | |
2408 | goto nla_put_failure; | |
2409 | } else { | |
2410 | if (err == -EMSGSIZE) | |
2411 | goto nla_put_failure; | |
2412 | error = err; | |
2413 | } | |
2414 | } | |
2415 | } else | |
2416 | #endif | |
91146153 | 2417 | if (nla_put_u32(skb, RTA_IIF, skb->dev->ifindex)) |
8caaf7b6 | 2418 | goto nla_put_failure; |
1da177e4 LT |
2419 | } |
2420 | ||
f185071d | 2421 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
e3703b3d | 2422 | goto nla_put_failure; |
be403ea1 | 2423 | |
053c095a JB |
2424 | nlmsg_end(skb, nlh); |
2425 | return 0; | |
1da177e4 | 2426 | |
be403ea1 | 2427 | nla_put_failure: |
26932566 PM |
2428 | nlmsg_cancel(skb, nlh); |
2429 | return -EMSGSIZE; | |
1da177e4 LT |
2430 | } |
2431 | ||
661d2967 | 2432 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 2433 | { |
3b1e0a65 | 2434 | struct net *net = sock_net(in_skb->sk); |
d889ce3b TG |
2435 | struct rtmsg *rtm; |
2436 | struct nlattr *tb[RTA_MAX+1]; | |
1da177e4 | 2437 | struct rtable *rt = NULL; |
d6c0a4f6 | 2438 | struct flowi4 fl4; |
9e12bb22 AV |
2439 | __be32 dst = 0; |
2440 | __be32 src = 0; | |
2441 | u32 iif; | |
d889ce3b | 2442 | int err; |
963bfeee | 2443 | int mark; |
1da177e4 LT |
2444 | struct sk_buff *skb; |
2445 | ||
d889ce3b TG |
2446 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
2447 | if (err < 0) | |
2448 | goto errout; | |
2449 | ||
2450 | rtm = nlmsg_data(nlh); | |
2451 | ||
1da177e4 | 2452 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
51456b29 | 2453 | if (!skb) { |
d889ce3b TG |
2454 | err = -ENOBUFS; |
2455 | goto errout; | |
2456 | } | |
1da177e4 LT |
2457 | |
2458 | /* Reserve room for dummy headers, this skb can pass | |
2459 | through good chunk of routing engine. | |
2460 | */ | |
459a98ed | 2461 | skb_reset_mac_header(skb); |
c1d2bbe1 | 2462 | skb_reset_network_header(skb); |
d2c962b8 SH |
2463 | |
2464 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ | |
eddc9ec5 | 2465 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
1da177e4 LT |
2466 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
2467 | ||
67b61f6c JB |
2468 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
2469 | dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
d889ce3b | 2470 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 2471 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
1da177e4 | 2472 | |
d6c0a4f6 DM |
2473 | memset(&fl4, 0, sizeof(fl4)); |
2474 | fl4.daddr = dst; | |
2475 | fl4.saddr = src; | |
2476 | fl4.flowi4_tos = rtm->rtm_tos; | |
2477 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; | |
2478 | fl4.flowi4_mark = mark; | |
2479 | ||
1da177e4 | 2480 | if (iif) { |
d889ce3b TG |
2481 | struct net_device *dev; |
2482 | ||
1937504d | 2483 | dev = __dev_get_by_index(net, iif); |
51456b29 | 2484 | if (!dev) { |
d889ce3b TG |
2485 | err = -ENODEV; |
2486 | goto errout_free; | |
2487 | } | |
2488 | ||
1da177e4 LT |
2489 | skb->protocol = htons(ETH_P_IP); |
2490 | skb->dev = dev; | |
963bfeee | 2491 | skb->mark = mark; |
1da177e4 LT |
2492 | local_bh_disable(); |
2493 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); | |
2494 | local_bh_enable(); | |
d889ce3b | 2495 | |
511c3f92 | 2496 | rt = skb_rtable(skb); |
d8d1f30b CG |
2497 | if (err == 0 && rt->dst.error) |
2498 | err = -rt->dst.error; | |
1da177e4 | 2499 | } else { |
9d6ec938 | 2500 | rt = ip_route_output_key(net, &fl4); |
b23dd4fe DM |
2501 | |
2502 | err = 0; | |
2503 | if (IS_ERR(rt)) | |
2504 | err = PTR_ERR(rt); | |
1da177e4 | 2505 | } |
d889ce3b | 2506 | |
1da177e4 | 2507 | if (err) |
d889ce3b | 2508 | goto errout_free; |
1da177e4 | 2509 | |
d8d1f30b | 2510 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
2511 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
2512 | rt->rt_flags |= RTCF_NOTIFY; | |
2513 | ||
f1ce3062 | 2514 | err = rt_fill_info(net, dst, src, &fl4, skb, |
15e47304 | 2515 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
1937504d | 2516 | RTM_NEWROUTE, 0, 0); |
7b46a644 | 2517 | if (err < 0) |
d889ce3b | 2518 | goto errout_free; |
1da177e4 | 2519 | |
15e47304 | 2520 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
d889ce3b | 2521 | errout: |
2942e900 | 2522 | return err; |
1da177e4 | 2523 | |
d889ce3b | 2524 | errout_free: |
1da177e4 | 2525 | kfree_skb(skb); |
d889ce3b | 2526 | goto errout; |
1da177e4 LT |
2527 | } |
2528 | ||
1da177e4 LT |
2529 | void ip_rt_multicast_event(struct in_device *in_dev) |
2530 | { | |
4ccfe6d4 | 2531 | rt_cache_flush(dev_net(in_dev->dev)); |
1da177e4 LT |
2532 | } |
2533 | ||
2534 | #ifdef CONFIG_SYSCTL | |
082c7ca4 G |
2535 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
2536 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; | |
2537 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
2538 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
2539 | ||
fe2c6338 | 2540 | static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write, |
8d65af78 | 2541 | void __user *buffer, |
1da177e4 LT |
2542 | size_t *lenp, loff_t *ppos) |
2543 | { | |
5aad1de5 TT |
2544 | struct net *net = (struct net *)__ctl->extra1; |
2545 | ||
1da177e4 | 2546 | if (write) { |
5aad1de5 TT |
2547 | rt_cache_flush(net); |
2548 | fnhe_genid_bump(net); | |
1da177e4 | 2549 | return 0; |
e905a9ed | 2550 | } |
1da177e4 LT |
2551 | |
2552 | return -EINVAL; | |
2553 | } | |
2554 | ||
fe2c6338 | 2555 | static struct ctl_table ipv4_route_table[] = { |
1da177e4 | 2556 | { |
1da177e4 LT |
2557 | .procname = "gc_thresh", |
2558 | .data = &ipv4_dst_ops.gc_thresh, | |
2559 | .maxlen = sizeof(int), | |
2560 | .mode = 0644, | |
6d9f239a | 2561 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2562 | }, |
2563 | { | |
1da177e4 LT |
2564 | .procname = "max_size", |
2565 | .data = &ip_rt_max_size, | |
2566 | .maxlen = sizeof(int), | |
2567 | .mode = 0644, | |
6d9f239a | 2568 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2569 | }, |
2570 | { | |
2571 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 2572 | |
1da177e4 LT |
2573 | .procname = "gc_min_interval", |
2574 | .data = &ip_rt_gc_min_interval, | |
2575 | .maxlen = sizeof(int), | |
2576 | .mode = 0644, | |
6d9f239a | 2577 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2578 | }, |
2579 | { | |
1da177e4 LT |
2580 | .procname = "gc_min_interval_ms", |
2581 | .data = &ip_rt_gc_min_interval, | |
2582 | .maxlen = sizeof(int), | |
2583 | .mode = 0644, | |
6d9f239a | 2584 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
2585 | }, |
2586 | { | |
1da177e4 LT |
2587 | .procname = "gc_timeout", |
2588 | .data = &ip_rt_gc_timeout, | |
2589 | .maxlen = sizeof(int), | |
2590 | .mode = 0644, | |
6d9f239a | 2591 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 2592 | }, |
9f28a2fc ED |
2593 | { |
2594 | .procname = "gc_interval", | |
2595 | .data = &ip_rt_gc_interval, | |
2596 | .maxlen = sizeof(int), | |
2597 | .mode = 0644, | |
2598 | .proc_handler = proc_dointvec_jiffies, | |
2599 | }, | |
1da177e4 | 2600 | { |
1da177e4 LT |
2601 | .procname = "redirect_load", |
2602 | .data = &ip_rt_redirect_load, | |
2603 | .maxlen = sizeof(int), | |
2604 | .mode = 0644, | |
6d9f239a | 2605 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2606 | }, |
2607 | { | |
1da177e4 LT |
2608 | .procname = "redirect_number", |
2609 | .data = &ip_rt_redirect_number, | |
2610 | .maxlen = sizeof(int), | |
2611 | .mode = 0644, | |
6d9f239a | 2612 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2613 | }, |
2614 | { | |
1da177e4 LT |
2615 | .procname = "redirect_silence", |
2616 | .data = &ip_rt_redirect_silence, | |
2617 | .maxlen = sizeof(int), | |
2618 | .mode = 0644, | |
6d9f239a | 2619 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2620 | }, |
2621 | { | |
1da177e4 LT |
2622 | .procname = "error_cost", |
2623 | .data = &ip_rt_error_cost, | |
2624 | .maxlen = sizeof(int), | |
2625 | .mode = 0644, | |
6d9f239a | 2626 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2627 | }, |
2628 | { | |
1da177e4 LT |
2629 | .procname = "error_burst", |
2630 | .data = &ip_rt_error_burst, | |
2631 | .maxlen = sizeof(int), | |
2632 | .mode = 0644, | |
6d9f239a | 2633 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2634 | }, |
2635 | { | |
1da177e4 LT |
2636 | .procname = "gc_elasticity", |
2637 | .data = &ip_rt_gc_elasticity, | |
2638 | .maxlen = sizeof(int), | |
2639 | .mode = 0644, | |
6d9f239a | 2640 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2641 | }, |
2642 | { | |
1da177e4 LT |
2643 | .procname = "mtu_expires", |
2644 | .data = &ip_rt_mtu_expires, | |
2645 | .maxlen = sizeof(int), | |
2646 | .mode = 0644, | |
6d9f239a | 2647 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2648 | }, |
2649 | { | |
1da177e4 LT |
2650 | .procname = "min_pmtu", |
2651 | .data = &ip_rt_min_pmtu, | |
2652 | .maxlen = sizeof(int), | |
2653 | .mode = 0644, | |
6d9f239a | 2654 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2655 | }, |
2656 | { | |
1da177e4 LT |
2657 | .procname = "min_adv_mss", |
2658 | .data = &ip_rt_min_advmss, | |
2659 | .maxlen = sizeof(int), | |
2660 | .mode = 0644, | |
6d9f239a | 2661 | .proc_handler = proc_dointvec, |
1da177e4 | 2662 | }, |
f8572d8f | 2663 | { } |
1da177e4 | 2664 | }; |
39a23e75 | 2665 | |
39a23e75 DL |
2666 | static struct ctl_table ipv4_route_flush_table[] = { |
2667 | { | |
39a23e75 DL |
2668 | .procname = "flush", |
2669 | .maxlen = sizeof(int), | |
2670 | .mode = 0200, | |
6d9f239a | 2671 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 2672 | }, |
f8572d8f | 2673 | { }, |
39a23e75 DL |
2674 | }; |
2675 | ||
2676 | static __net_init int sysctl_route_net_init(struct net *net) | |
2677 | { | |
2678 | struct ctl_table *tbl; | |
2679 | ||
2680 | tbl = ipv4_route_flush_table; | |
09ad9bc7 | 2681 | if (!net_eq(net, &init_net)) { |
39a23e75 | 2682 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
51456b29 | 2683 | if (!tbl) |
39a23e75 | 2684 | goto err_dup; |
464dc801 EB |
2685 | |
2686 | /* Don't export sysctls to unprivileged users */ | |
2687 | if (net->user_ns != &init_user_ns) | |
2688 | tbl[0].procname = NULL; | |
39a23e75 DL |
2689 | } |
2690 | tbl[0].extra1 = net; | |
2691 | ||
ec8f23ce | 2692 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
51456b29 | 2693 | if (!net->ipv4.route_hdr) |
39a23e75 DL |
2694 | goto err_reg; |
2695 | return 0; | |
2696 | ||
2697 | err_reg: | |
2698 | if (tbl != ipv4_route_flush_table) | |
2699 | kfree(tbl); | |
2700 | err_dup: | |
2701 | return -ENOMEM; | |
2702 | } | |
2703 | ||
2704 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
2705 | { | |
2706 | struct ctl_table *tbl; | |
2707 | ||
2708 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
2709 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
2710 | BUG_ON(tbl == ipv4_route_flush_table); | |
2711 | kfree(tbl); | |
2712 | } | |
2713 | ||
2714 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
2715 | .init = sysctl_route_net_init, | |
2716 | .exit = sysctl_route_net_exit, | |
2717 | }; | |
1da177e4 LT |
2718 | #endif |
2719 | ||
3ee94372 | 2720 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 2721 | { |
ca4c3fc2 | 2722 | atomic_set(&net->ipv4.rt_genid, 0); |
5aad1de5 | 2723 | atomic_set(&net->fnhe_genid, 0); |
436c3b66 DM |
2724 | get_random_bytes(&net->ipv4.dev_addr_genid, |
2725 | sizeof(net->ipv4.dev_addr_genid)); | |
9f5e97e5 DL |
2726 | return 0; |
2727 | } | |
2728 | ||
3ee94372 NH |
2729 | static __net_initdata struct pernet_operations rt_genid_ops = { |
2730 | .init = rt_genid_init, | |
9f5e97e5 DL |
2731 | }; |
2732 | ||
c3426b47 DM |
2733 | static int __net_init ipv4_inetpeer_init(struct net *net) |
2734 | { | |
2735 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
2736 | ||
2737 | if (!bp) | |
2738 | return -ENOMEM; | |
2739 | inet_peer_base_init(bp); | |
2740 | net->ipv4.peers = bp; | |
2741 | return 0; | |
2742 | } | |
2743 | ||
2744 | static void __net_exit ipv4_inetpeer_exit(struct net *net) | |
2745 | { | |
2746 | struct inet_peer_base *bp = net->ipv4.peers; | |
2747 | ||
2748 | net->ipv4.peers = NULL; | |
56a6b248 | 2749 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
2750 | kfree(bp); |
2751 | } | |
2752 | ||
2753 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { | |
2754 | .init = ipv4_inetpeer_init, | |
2755 | .exit = ipv4_inetpeer_exit, | |
2756 | }; | |
9f5e97e5 | 2757 | |
c7066f70 | 2758 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 2759 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 2760 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 | 2761 | |
1da177e4 LT |
2762 | int __init ip_rt_init(void) |
2763 | { | |
424c4b70 | 2764 | int rc = 0; |
5055c371 | 2765 | int cpu; |
1da177e4 | 2766 | |
73f156a6 ED |
2767 | ip_idents = kmalloc(IP_IDENTS_SZ * sizeof(*ip_idents), GFP_KERNEL); |
2768 | if (!ip_idents) | |
2769 | panic("IP: failed to allocate ip_idents\n"); | |
2770 | ||
2771 | prandom_bytes(ip_idents, IP_IDENTS_SZ * sizeof(*ip_idents)); | |
2772 | ||
355b590c ED |
2773 | ip_tstamps = kcalloc(IP_IDENTS_SZ, sizeof(*ip_tstamps), GFP_KERNEL); |
2774 | if (!ip_tstamps) | |
2775 | panic("IP: failed to allocate ip_tstamps\n"); | |
2776 | ||
5055c371 ED |
2777 | for_each_possible_cpu(cpu) { |
2778 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
2779 | ||
2780 | INIT_LIST_HEAD(&ul->head); | |
2781 | spin_lock_init(&ul->lock); | |
2782 | } | |
c7066f70 | 2783 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 2784 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
2785 | if (!ip_rt_acct) |
2786 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
2787 | #endif |
2788 | ||
e5d679f3 AD |
2789 | ipv4_dst_ops.kmem_cachep = |
2790 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, | |
20c2df83 | 2791 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 2792 | |
14e50e57 DM |
2793 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
2794 | ||
fc66f95c ED |
2795 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
2796 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
2797 | ||
2798 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
2799 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
2800 | ||
89aef892 DM |
2801 | ipv4_dst_ops.gc_thresh = ~0; |
2802 | ip_rt_max_size = INT_MAX; | |
1da177e4 | 2803 | |
1da177e4 LT |
2804 | devinet_init(); |
2805 | ip_fib_init(); | |
2806 | ||
73b38711 | 2807 | if (ip_rt_proc_init()) |
058bd4d2 | 2808 | pr_err("Unable to create route proc files\n"); |
1da177e4 LT |
2809 | #ifdef CONFIG_XFRM |
2810 | xfrm_init(); | |
703fb94e | 2811 | xfrm4_init(); |
1da177e4 | 2812 | #endif |
c7ac8679 | 2813 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL); |
63f3444f | 2814 | |
39a23e75 DL |
2815 | #ifdef CONFIG_SYSCTL |
2816 | register_pernet_subsys(&sysctl_route_ops); | |
2817 | #endif | |
3ee94372 | 2818 | register_pernet_subsys(&rt_genid_ops); |
c3426b47 | 2819 | register_pernet_subsys(&ipv4_inetpeer_ops); |
1da177e4 LT |
2820 | return rc; |
2821 | } | |
2822 | ||
a1bc6eb4 | 2823 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
2824 | /* |
2825 | * We really need to sanitize the damn ipv4 init order, then all | |
2826 | * this nonsense will go away. | |
2827 | */ | |
2828 | void __init ip_static_sysctl_init(void) | |
2829 | { | |
4e5ca785 | 2830 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
eeb61f71 | 2831 | } |
a1bc6eb4 | 2832 | #endif |