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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ip_vs_xmit.c: various packet transmitters for IPVS | |
3 | * | |
1da177e4 LT |
4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
5 | * Julian Anastasov <ja@ssi.bg> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * Changes: | |
13 | * | |
cb59155f JA |
14 | * Description of forwarding methods: |
15 | * - all transmitters are called from LOCAL_IN (remote clients) and | |
16 | * LOCAL_OUT (local clients) but for ICMP can be called from FORWARD | |
17 | * - not all connections have destination server, for example, | |
18 | * connections in backup server when fwmark is used | |
19 | * - bypass connections use daddr from packet | |
20 | * LOCAL_OUT rules: | |
21 | * - skb->dev is NULL, skb->protocol is not set (both are set in POST_ROUTING) | |
22 | * - skb->pkt_type is not set yet | |
23 | * - the only place where we can see skb->sk != NULL | |
1da177e4 LT |
24 | */ |
25 | ||
9aada7ac HE |
26 | #define KMSG_COMPONENT "IPVS" |
27 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
28 | ||
1da177e4 | 29 | #include <linux/kernel.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
1da177e4 | 31 | #include <linux/tcp.h> /* for tcphdr */ |
c439cb2e | 32 | #include <net/ip.h> |
1da177e4 LT |
33 | #include <net/tcp.h> /* for csum_tcpudp_magic */ |
34 | #include <net/udp.h> | |
35 | #include <net/icmp.h> /* for icmp_send */ | |
36 | #include <net/route.h> /* for ip_route_output */ | |
38cdcc9a JV |
37 | #include <net/ipv6.h> |
38 | #include <net/ip6_route.h> | |
714f095f | 39 | #include <net/addrconf.h> |
38cdcc9a | 40 | #include <linux/icmpv6.h> |
1da177e4 LT |
41 | #include <linux/netfilter.h> |
42 | #include <linux/netfilter_ipv4.h> | |
43 | ||
44 | #include <net/ip_vs.h> | |
45 | ||
17a8f8e3 CG |
46 | enum { |
47 | IP_VS_RT_MODE_LOCAL = 1, /* Allow local dest */ | |
48 | IP_VS_RT_MODE_NON_LOCAL = 2, /* Allow non-local dest */ | |
49 | IP_VS_RT_MODE_RDR = 4, /* Allow redirect from remote daddr to | |
50 | * local | |
51 | */ | |
52 | }; | |
1da177e4 LT |
53 | |
54 | /* | |
55 | * Destination cache to speed up outgoing route lookup | |
56 | */ | |
57 | static inline void | |
714f095f HS |
58 | __ip_vs_dst_set(struct ip_vs_dest *dest, u32 rtos, struct dst_entry *dst, |
59 | u32 dst_cookie) | |
1da177e4 LT |
60 | { |
61 | struct dst_entry *old_dst; | |
62 | ||
63 | old_dst = dest->dst_cache; | |
64 | dest->dst_cache = dst; | |
65 | dest->dst_rtos = rtos; | |
714f095f | 66 | dest->dst_cookie = dst_cookie; |
1da177e4 LT |
67 | dst_release(old_dst); |
68 | } | |
69 | ||
70 | static inline struct dst_entry * | |
714f095f | 71 | __ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos) |
1da177e4 LT |
72 | { |
73 | struct dst_entry *dst = dest->dst_cache; | |
74 | ||
75 | if (!dst) | |
76 | return NULL; | |
714f095f HS |
77 | if ((dst->obsolete || rtos != dest->dst_rtos) && |
78 | dst->ops->check(dst, dest->dst_cookie) == NULL) { | |
1da177e4 LT |
79 | dest->dst_cache = NULL; |
80 | dst_release(dst); | |
81 | return NULL; | |
82 | } | |
83 | dst_hold(dst); | |
84 | return dst; | |
85 | } | |
86 | ||
17a8f8e3 | 87 | /* Get route to destination or remote server */ |
ad1b30b1 | 88 | static struct rtable * |
fc604767 | 89 | __ip_vs_get_out_rt(struct sk_buff *skb, struct ip_vs_dest *dest, |
c92f5ca2 | 90 | __be32 daddr, u32 rtos, int rt_mode, __be32 *ret_saddr) |
1da177e4 | 91 | { |
fc604767 | 92 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 93 | struct rtable *rt; /* Route to the other host */ |
fc604767 JA |
94 | struct rtable *ort; /* Original route */ |
95 | int local; | |
1da177e4 LT |
96 | |
97 | if (dest) { | |
98 | spin_lock(&dest->dst_lock); | |
99 | if (!(rt = (struct rtable *) | |
714f095f | 100 | __ip_vs_dst_check(dest, rtos))) { |
c92f5ca2 JA |
101 | struct flowi4 fl4; |
102 | ||
103 | memset(&fl4, 0, sizeof(fl4)); | |
104 | fl4.daddr = dest->addr.ip; | |
105 | fl4.flowi4_tos = rtos; | |
106 | rt = ip_route_output_key(net, &fl4); | |
b23dd4fe | 107 | if (IS_ERR(rt)) { |
1da177e4 | 108 | spin_unlock(&dest->dst_lock); |
14d5e834 HH |
109 | IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", |
110 | &dest->addr.ip); | |
1da177e4 LT |
111 | return NULL; |
112 | } | |
714f095f | 113 | __ip_vs_dst_set(dest, rtos, dst_clone(&rt->dst), 0); |
c92f5ca2 JA |
114 | dest->dst_saddr.ip = fl4.saddr; |
115 | IP_VS_DBG(10, "new dst %pI4, src %pI4, refcnt=%d, " | |
116 | "rtos=%X\n", | |
117 | &dest->addr.ip, &dest->dst_saddr.ip, | |
d8d1f30b | 118 | atomic_read(&rt->dst.__refcnt), rtos); |
1da177e4 | 119 | } |
44e3125c | 120 | daddr = dest->addr.ip; |
c92f5ca2 JA |
121 | if (ret_saddr) |
122 | *ret_saddr = dest->dst_saddr.ip; | |
1da177e4 LT |
123 | spin_unlock(&dest->dst_lock); |
124 | } else { | |
c92f5ca2 JA |
125 | struct flowi4 fl4; |
126 | ||
127 | memset(&fl4, 0, sizeof(fl4)); | |
128 | fl4.daddr = daddr; | |
129 | fl4.flowi4_tos = rtos; | |
130 | rt = ip_route_output_key(net, &fl4); | |
b23dd4fe | 131 | if (IS_ERR(rt)) { |
14d5e834 | 132 | IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", |
fc604767 | 133 | &daddr); |
1da177e4 LT |
134 | return NULL; |
135 | } | |
c92f5ca2 JA |
136 | if (ret_saddr) |
137 | *ret_saddr = fl4.saddr; | |
1da177e4 LT |
138 | } |
139 | ||
fc604767 | 140 | local = rt->rt_flags & RTCF_LOCAL; |
17a8f8e3 CG |
141 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
142 | rt_mode)) { | |
fc604767 JA |
143 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI4\n", |
144 | (rt->rt_flags & RTCF_LOCAL) ? | |
44e3125c | 145 | "local":"non-local", &daddr); |
fc604767 JA |
146 | ip_rt_put(rt); |
147 | return NULL; | |
148 | } | |
17a8f8e3 CG |
149 | if (local && !(rt_mode & IP_VS_RT_MODE_RDR) && |
150 | !((ort = skb_rtable(skb)) && ort->rt_flags & RTCF_LOCAL)) { | |
fc604767 JA |
151 | IP_VS_DBG_RL("Redirect from non-local address %pI4 to local " |
152 | "requires NAT method, dest: %pI4\n", | |
44e3125c | 153 | &ip_hdr(skb)->daddr, &daddr); |
fc604767 JA |
154 | ip_rt_put(rt); |
155 | return NULL; | |
156 | } | |
157 | if (unlikely(!local && ipv4_is_loopback(ip_hdr(skb)->saddr))) { | |
158 | IP_VS_DBG_RL("Stopping traffic from loopback address %pI4 " | |
159 | "to non-local address, dest: %pI4\n", | |
44e3125c | 160 | &ip_hdr(skb)->saddr, &daddr); |
fc604767 JA |
161 | ip_rt_put(rt); |
162 | return NULL; | |
163 | } | |
164 | ||
1da177e4 LT |
165 | return rt; |
166 | } | |
167 | ||
fc604767 JA |
168 | /* Reroute packet to local IPv4 stack after DNAT */ |
169 | static int | |
170 | __ip_vs_reroute_locally(struct sk_buff *skb) | |
171 | { | |
172 | struct rtable *rt = skb_rtable(skb); | |
173 | struct net_device *dev = rt->dst.dev; | |
174 | struct net *net = dev_net(dev); | |
175 | struct iphdr *iph = ip_hdr(skb); | |
176 | ||
c7537967 | 177 | if (rt_is_input_route(rt)) { |
fc604767 JA |
178 | unsigned long orefdst = skb->_skb_refdst; |
179 | ||
180 | if (ip_route_input(skb, iph->daddr, iph->saddr, | |
181 | iph->tos, skb->dev)) | |
182 | return 0; | |
183 | refdst_drop(orefdst); | |
184 | } else { | |
9d6ec938 DM |
185 | struct flowi4 fl4 = { |
186 | .daddr = iph->daddr, | |
187 | .saddr = iph->saddr, | |
188 | .flowi4_tos = RT_TOS(iph->tos), | |
189 | .flowi4_mark = skb->mark, | |
fc604767 | 190 | }; |
fc604767 | 191 | |
9d6ec938 | 192 | rt = ip_route_output_key(net, &fl4); |
b23dd4fe | 193 | if (IS_ERR(rt)) |
fc604767 JA |
194 | return 0; |
195 | if (!(rt->rt_flags & RTCF_LOCAL)) { | |
196 | ip_rt_put(rt); | |
197 | return 0; | |
198 | } | |
199 | /* Drop old route. */ | |
200 | skb_dst_drop(skb); | |
201 | skb_dst_set(skb, &rt->dst); | |
202 | } | |
203 | return 1; | |
204 | } | |
205 | ||
38cdcc9a | 206 | #ifdef CONFIG_IP_VS_IPV6 |
714f095f | 207 | |
fc604767 JA |
208 | static inline int __ip_vs_is_local_route6(struct rt6_info *rt) |
209 | { | |
d1918542 | 210 | return rt->dst.dev && rt->dst.dev->flags & IFF_LOOPBACK; |
fc604767 JA |
211 | } |
212 | ||
714f095f HS |
213 | static struct dst_entry * |
214 | __ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr, | |
215 | struct in6_addr *ret_saddr, int do_xfrm) | |
216 | { | |
217 | struct dst_entry *dst; | |
4c9483b2 DM |
218 | struct flowi6 fl6 = { |
219 | .daddr = *daddr, | |
714f095f HS |
220 | }; |
221 | ||
4c9483b2 | 222 | dst = ip6_route_output(net, NULL, &fl6); |
714f095f HS |
223 | if (dst->error) |
224 | goto out_err; | |
225 | if (!ret_saddr) | |
226 | return dst; | |
4c9483b2 | 227 | if (ipv6_addr_any(&fl6.saddr) && |
714f095f | 228 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, |
4c9483b2 | 229 | &fl6.daddr, 0, &fl6.saddr) < 0) |
714f095f | 230 | goto out_err; |
452edd59 | 231 | if (do_xfrm) { |
4c9483b2 | 232 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 DM |
233 | if (IS_ERR(dst)) { |
234 | dst = NULL; | |
235 | goto out_err; | |
236 | } | |
237 | } | |
4e3fd7a0 | 238 | *ret_saddr = fl6.saddr; |
714f095f HS |
239 | return dst; |
240 | ||
241 | out_err: | |
242 | dst_release(dst); | |
243 | IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr); | |
244 | return NULL; | |
245 | } | |
246 | ||
fc604767 JA |
247 | /* |
248 | * Get route to destination or remote server | |
fc604767 | 249 | */ |
38cdcc9a | 250 | static struct rt6_info * |
fc604767 JA |
251 | __ip_vs_get_out_rt_v6(struct sk_buff *skb, struct ip_vs_dest *dest, |
252 | struct in6_addr *daddr, struct in6_addr *ret_saddr, | |
253 | int do_xfrm, int rt_mode) | |
38cdcc9a | 254 | { |
fc604767 | 255 | struct net *net = dev_net(skb_dst(skb)->dev); |
38cdcc9a | 256 | struct rt6_info *rt; /* Route to the other host */ |
fc604767 | 257 | struct rt6_info *ort; /* Original route */ |
714f095f | 258 | struct dst_entry *dst; |
fc604767 | 259 | int local; |
38cdcc9a JV |
260 | |
261 | if (dest) { | |
262 | spin_lock(&dest->dst_lock); | |
714f095f | 263 | rt = (struct rt6_info *)__ip_vs_dst_check(dest, 0); |
38cdcc9a | 264 | if (!rt) { |
714f095f | 265 | u32 cookie; |
38cdcc9a | 266 | |
714f095f | 267 | dst = __ip_vs_route_output_v6(net, &dest->addr.in6, |
c92f5ca2 | 268 | &dest->dst_saddr.in6, |
714f095f HS |
269 | do_xfrm); |
270 | if (!dst) { | |
38cdcc9a | 271 | spin_unlock(&dest->dst_lock); |
38cdcc9a JV |
272 | return NULL; |
273 | } | |
714f095f HS |
274 | rt = (struct rt6_info *) dst; |
275 | cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
276 | __ip_vs_dst_set(dest, 0, dst_clone(&rt->dst), cookie); | |
277 | IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n", | |
c92f5ca2 | 278 | &dest->addr.in6, &dest->dst_saddr.in6, |
d8d1f30b | 279 | atomic_read(&rt->dst.__refcnt)); |
38cdcc9a | 280 | } |
714f095f | 281 | if (ret_saddr) |
4e3fd7a0 | 282 | *ret_saddr = dest->dst_saddr.in6; |
38cdcc9a JV |
283 | spin_unlock(&dest->dst_lock); |
284 | } else { | |
fc604767 | 285 | dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm); |
714f095f | 286 | if (!dst) |
38cdcc9a | 287 | return NULL; |
714f095f | 288 | rt = (struct rt6_info *) dst; |
38cdcc9a JV |
289 | } |
290 | ||
fc604767 | 291 | local = __ip_vs_is_local_route6(rt); |
e58b3442 DM |
292 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
293 | rt_mode)) { | |
fc604767 JA |
294 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI6\n", |
295 | local ? "local":"non-local", daddr); | |
296 | dst_release(&rt->dst); | |
297 | return NULL; | |
298 | } | |
e58b3442 | 299 | if (local && !(rt_mode & IP_VS_RT_MODE_RDR) && |
fc604767 JA |
300 | !((ort = (struct rt6_info *) skb_dst(skb)) && |
301 | __ip_vs_is_local_route6(ort))) { | |
302 | IP_VS_DBG_RL("Redirect from non-local address %pI6 to local " | |
303 | "requires NAT method, dest: %pI6\n", | |
304 | &ipv6_hdr(skb)->daddr, daddr); | |
305 | dst_release(&rt->dst); | |
306 | return NULL; | |
307 | } | |
308 | if (unlikely(!local && (!skb->dev || skb->dev->flags & IFF_LOOPBACK) && | |
309 | ipv6_addr_type(&ipv6_hdr(skb)->saddr) & | |
310 | IPV6_ADDR_LOOPBACK)) { | |
311 | IP_VS_DBG_RL("Stopping traffic from loopback address %pI6 " | |
312 | "to non-local address, dest: %pI6\n", | |
313 | &ipv6_hdr(skb)->saddr, daddr); | |
314 | dst_release(&rt->dst); | |
315 | return NULL; | |
316 | } | |
317 | ||
38cdcc9a JV |
318 | return rt; |
319 | } | |
320 | #endif | |
321 | ||
1da177e4 LT |
322 | |
323 | /* | |
324 | * Release dest->dst_cache before a dest is removed | |
325 | */ | |
326 | void | |
327 | ip_vs_dst_reset(struct ip_vs_dest *dest) | |
328 | { | |
329 | struct dst_entry *old_dst; | |
330 | ||
331 | old_dst = dest->dst_cache; | |
332 | dest->dst_cache = NULL; | |
333 | dst_release(old_dst); | |
334 | } | |
335 | ||
f4bc17cd JA |
336 | #define IP_VS_XMIT_TUNNEL(skb, cp) \ |
337 | ({ \ | |
338 | int __ret = NF_ACCEPT; \ | |
339 | \ | |
cf356d69 | 340 | (skb)->ipvs_property = 1; \ |
f4bc17cd | 341 | if (unlikely((cp)->flags & IP_VS_CONN_F_NFCT)) \ |
3c2de2ae | 342 | __ret = ip_vs_confirm_conntrack(skb); \ |
f4bc17cd JA |
343 | if (__ret == NF_ACCEPT) { \ |
344 | nf_reset(skb); \ | |
4256f1aa | 345 | skb_forward_csum(skb); \ |
f4bc17cd JA |
346 | } \ |
347 | __ret; \ | |
348 | }) | |
349 | ||
fc604767 | 350 | #define IP_VS_XMIT_NAT(pf, skb, cp, local) \ |
1da177e4 | 351 | do { \ |
cf356d69 | 352 | (skb)->ipvs_property = 1; \ |
f4bc17cd | 353 | if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \ |
cf356d69 | 354 | ip_vs_notrack(skb); \ |
f4bc17cd JA |
355 | else \ |
356 | ip_vs_update_conntrack(skb, cp, 1); \ | |
fc604767 JA |
357 | if (local) \ |
358 | return NF_ACCEPT; \ | |
ccc7911f | 359 | skb_forward_csum(skb); \ |
38cdcc9a | 360 | NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \ |
f4bc17cd JA |
361 | skb_dst(skb)->dev, dst_output); \ |
362 | } while (0) | |
363 | ||
fc604767 | 364 | #define IP_VS_XMIT(pf, skb, cp, local) \ |
f4bc17cd | 365 | do { \ |
cf356d69 | 366 | (skb)->ipvs_property = 1; \ |
f4bc17cd | 367 | if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \ |
cf356d69 | 368 | ip_vs_notrack(skb); \ |
fc604767 JA |
369 | if (local) \ |
370 | return NF_ACCEPT; \ | |
f4bc17cd JA |
371 | skb_forward_csum(skb); \ |
372 | NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \ | |
373 | skb_dst(skb)->dev, dst_output); \ | |
1da177e4 LT |
374 | } while (0) |
375 | ||
376 | ||
377 | /* | |
378 | * NULL transmitter (do nothing except return NF_ACCEPT) | |
379 | */ | |
380 | int | |
381 | ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
382 | struct ip_vs_protocol *pp) | |
383 | { | |
384 | /* we do not touch skb and do not need pskb ptr */ | |
fc604767 | 385 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); |
1da177e4 LT |
386 | } |
387 | ||
388 | ||
389 | /* | |
390 | * Bypass transmitter | |
391 | * Let packets bypass the destination when the destination is not | |
392 | * available, it may be only used in transparent cache cluster. | |
393 | */ | |
394 | int | |
395 | ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
396 | struct ip_vs_protocol *pp) | |
397 | { | |
398 | struct rtable *rt; /* Route to the other host */ | |
eddc9ec5 | 399 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 400 | int mtu; |
1da177e4 LT |
401 | |
402 | EnterFunction(10); | |
403 | ||
17a8f8e3 | 404 | if (!(rt = __ip_vs_get_out_rt(skb, NULL, iph->daddr, RT_TOS(iph->tos), |
c92f5ca2 | 405 | IP_VS_RT_MODE_NON_LOCAL, NULL))) |
1da177e4 | 406 | goto tx_error_icmp; |
1da177e4 LT |
407 | |
408 | /* MTU checking */ | |
d8d1f30b | 409 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
410 | if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) && |
411 | !skb_is_gso(skb)) { | |
1da177e4 LT |
412 | ip_rt_put(rt); |
413 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); | |
1e3e238e | 414 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
1da177e4 LT |
415 | goto tx_error; |
416 | } | |
417 | ||
418 | /* | |
419 | * Call ip_send_check because we are not sure it is called | |
420 | * after ip_defrag. Is copy-on-write needed? | |
421 | */ | |
422 | if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) { | |
423 | ip_rt_put(rt); | |
424 | return NF_STOLEN; | |
425 | } | |
eddc9ec5 | 426 | ip_send_check(ip_hdr(skb)); |
1da177e4 LT |
427 | |
428 | /* drop old route */ | |
adf30907 | 429 | skb_dst_drop(skb); |
d8d1f30b | 430 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
431 | |
432 | /* Another hack: avoid icmp_send in ip_fragment */ | |
433 | skb->local_df = 1; | |
434 | ||
fc604767 | 435 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0); |
1da177e4 LT |
436 | |
437 | LeaveFunction(10); | |
438 | return NF_STOLEN; | |
439 | ||
440 | tx_error_icmp: | |
441 | dst_link_failure(skb); | |
442 | tx_error: | |
443 | kfree_skb(skb); | |
444 | LeaveFunction(10); | |
445 | return NF_STOLEN; | |
446 | } | |
447 | ||
b3cdd2a7 JV |
448 | #ifdef CONFIG_IP_VS_IPV6 |
449 | int | |
450 | ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
451 | struct ip_vs_protocol *pp) | |
452 | { | |
453 | struct rt6_info *rt; /* Route to the other host */ | |
454 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
455 | int mtu; | |
b3cdd2a7 JV |
456 | |
457 | EnterFunction(10); | |
458 | ||
e58b3442 DM |
459 | if (!(rt = __ip_vs_get_out_rt_v6(skb, NULL, &iph->daddr, NULL, 0, |
460 | IP_VS_RT_MODE_NON_LOCAL))) | |
b3cdd2a7 | 461 | goto tx_error_icmp; |
b3cdd2a7 JV |
462 | |
463 | /* MTU checking */ | |
d8d1f30b | 464 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 465 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
466 | if (!skb->dev) { |
467 | struct net *net = dev_net(skb_dst(skb)->dev); | |
468 | ||
469 | skb->dev = net->loopback_dev; | |
470 | } | |
3ffe533c | 471 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
cb59155f | 472 | dst_release(&rt->dst); |
1e3e238e | 473 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
b3cdd2a7 JV |
474 | goto tx_error; |
475 | } | |
476 | ||
477 | /* | |
478 | * Call ip_send_check because we are not sure it is called | |
479 | * after ip_defrag. Is copy-on-write needed? | |
480 | */ | |
481 | skb = skb_share_check(skb, GFP_ATOMIC); | |
482 | if (unlikely(skb == NULL)) { | |
d8d1f30b | 483 | dst_release(&rt->dst); |
b3cdd2a7 JV |
484 | return NF_STOLEN; |
485 | } | |
486 | ||
487 | /* drop old route */ | |
adf30907 | 488 | skb_dst_drop(skb); |
d8d1f30b | 489 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
490 | |
491 | /* Another hack: avoid icmp_send in ip_fragment */ | |
492 | skb->local_df = 1; | |
493 | ||
fc604767 | 494 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0); |
b3cdd2a7 JV |
495 | |
496 | LeaveFunction(10); | |
497 | return NF_STOLEN; | |
498 | ||
499 | tx_error_icmp: | |
500 | dst_link_failure(skb); | |
501 | tx_error: | |
502 | kfree_skb(skb); | |
503 | LeaveFunction(10); | |
504 | return NF_STOLEN; | |
505 | } | |
506 | #endif | |
1da177e4 LT |
507 | |
508 | /* | |
509 | * NAT transmitter (only for outside-to-inside nat forwarding) | |
510 | * Not used for related ICMP | |
511 | */ | |
512 | int | |
513 | ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
514 | struct ip_vs_protocol *pp) | |
515 | { | |
516 | struct rtable *rt; /* Route to the other host */ | |
517 | int mtu; | |
eddc9ec5 | 518 | struct iphdr *iph = ip_hdr(skb); |
fc604767 | 519 | int local; |
1da177e4 LT |
520 | |
521 | EnterFunction(10); | |
522 | ||
523 | /* check if it is a connection of no-client-port */ | |
524 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { | |
014d730d | 525 | __be16 _pt, *p; |
1da177e4 LT |
526 | p = skb_header_pointer(skb, iph->ihl*4, sizeof(_pt), &_pt); |
527 | if (p == NULL) | |
528 | goto tx_error; | |
529 | ip_vs_conn_fill_cport(cp, *p); | |
530 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); | |
531 | } | |
532 | ||
fc604767 | 533 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 CG |
534 | RT_TOS(iph->tos), |
535 | IP_VS_RT_MODE_LOCAL | | |
536 | IP_VS_RT_MODE_NON_LOCAL | | |
c92f5ca2 | 537 | IP_VS_RT_MODE_RDR, NULL))) |
1da177e4 | 538 | goto tx_error_icmp; |
fc604767 JA |
539 | local = rt->rt_flags & RTCF_LOCAL; |
540 | /* | |
541 | * Avoid duplicate tuple in reply direction for NAT traffic | |
542 | * to local address when connection is sync-ed | |
543 | */ | |
c0cd1156 | 544 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
545 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
546 | enum ip_conntrack_info ctinfo; | |
547 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
548 | ||
549 | if (ct && !nf_ct_is_untracked(ct)) { | |
0d79641a JA |
550 | IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0, |
551 | "ip_vs_nat_xmit(): " | |
fc604767 JA |
552 | "stopping DNAT to local address"); |
553 | goto tx_error_put; | |
554 | } | |
555 | } | |
556 | #endif | |
557 | ||
558 | /* From world but DNAT to loopback address? */ | |
c92f5ca2 | 559 | if (local && ipv4_is_loopback(cp->daddr.ip) && |
c7537967 | 560 | rt_is_input_route(skb_rtable(skb))) { |
0d79641a | 561 | IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): " |
fc604767 JA |
562 | "stopping DNAT to loopback address"); |
563 | goto tx_error_put; | |
564 | } | |
1da177e4 LT |
565 | |
566 | /* MTU checking */ | |
d8d1f30b | 567 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
568 | if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) && |
569 | !skb_is_gso(skb)) { | |
1da177e4 | 570 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
0d79641a JA |
571 | IP_VS_DBG_RL_PKT(0, AF_INET, pp, skb, 0, |
572 | "ip_vs_nat_xmit(): frag needed for"); | |
fc604767 | 573 | goto tx_error_put; |
1da177e4 LT |
574 | } |
575 | ||
576 | /* copy-on-write the packet before mangling it */ | |
af1e1cf0 | 577 | if (!skb_make_writable(skb, sizeof(struct iphdr))) |
1da177e4 LT |
578 | goto tx_error_put; |
579 | ||
d8d1f30b | 580 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
1da177e4 LT |
581 | goto tx_error_put; |
582 | ||
1da177e4 | 583 | /* mangle the packet */ |
3db05fea | 584 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp)) |
fc604767 | 585 | goto tx_error_put; |
e7ade46a | 586 | ip_hdr(skb)->daddr = cp->daddr.ip; |
eddc9ec5 | 587 | ip_send_check(ip_hdr(skb)); |
1da177e4 | 588 | |
fc604767 JA |
589 | if (!local) { |
590 | /* drop old route */ | |
591 | skb_dst_drop(skb); | |
592 | skb_dst_set(skb, &rt->dst); | |
593 | } else { | |
594 | ip_rt_put(rt); | |
595 | /* | |
596 | * Some IPv4 replies get local address from routes, | |
597 | * not from iph, so while we DNAT after routing | |
598 | * we need this second input/output route. | |
599 | */ | |
600 | if (!__ip_vs_reroute_locally(skb)) | |
601 | goto tx_error; | |
602 | } | |
603 | ||
0d79641a | 604 | IP_VS_DBG_PKT(10, AF_INET, pp, skb, 0, "After DNAT"); |
1da177e4 LT |
605 | |
606 | /* FIXME: when application helper enlarges the packet and the length | |
607 | is larger than the MTU of outgoing device, there will be still | |
608 | MTU problem. */ | |
609 | ||
610 | /* Another hack: avoid icmp_send in ip_fragment */ | |
611 | skb->local_df = 1; | |
612 | ||
fc604767 | 613 | IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local); |
1da177e4 LT |
614 | |
615 | LeaveFunction(10); | |
616 | return NF_STOLEN; | |
617 | ||
618 | tx_error_icmp: | |
619 | dst_link_failure(skb); | |
620 | tx_error: | |
1da177e4 | 621 | kfree_skb(skb); |
f4bc17cd | 622 | LeaveFunction(10); |
1da177e4 LT |
623 | return NF_STOLEN; |
624 | tx_error_put: | |
625 | ip_rt_put(rt); | |
626 | goto tx_error; | |
627 | } | |
628 | ||
b3cdd2a7 JV |
629 | #ifdef CONFIG_IP_VS_IPV6 |
630 | int | |
631 | ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
632 | struct ip_vs_protocol *pp) | |
633 | { | |
634 | struct rt6_info *rt; /* Route to the other host */ | |
635 | int mtu; | |
fc604767 | 636 | int local; |
b3cdd2a7 JV |
637 | |
638 | EnterFunction(10); | |
639 | ||
640 | /* check if it is a connection of no-client-port */ | |
641 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { | |
642 | __be16 _pt, *p; | |
643 | p = skb_header_pointer(skb, sizeof(struct ipv6hdr), | |
644 | sizeof(_pt), &_pt); | |
645 | if (p == NULL) | |
646 | goto tx_error; | |
647 | ip_vs_conn_fill_cport(cp, *p); | |
648 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); | |
649 | } | |
650 | ||
fc604767 | 651 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
e58b3442 DM |
652 | 0, (IP_VS_RT_MODE_LOCAL | |
653 | IP_VS_RT_MODE_NON_LOCAL | | |
654 | IP_VS_RT_MODE_RDR)))) | |
b3cdd2a7 | 655 | goto tx_error_icmp; |
fc604767 JA |
656 | local = __ip_vs_is_local_route6(rt); |
657 | /* | |
658 | * Avoid duplicate tuple in reply direction for NAT traffic | |
659 | * to local address when connection is sync-ed | |
660 | */ | |
c0cd1156 | 661 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
662 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
663 | enum ip_conntrack_info ctinfo; | |
664 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
665 | ||
666 | if (ct && !nf_ct_is_untracked(ct)) { | |
0d79641a | 667 | IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0, |
fc604767 JA |
668 | "ip_vs_nat_xmit_v6(): " |
669 | "stopping DNAT to local address"); | |
670 | goto tx_error_put; | |
671 | } | |
672 | } | |
673 | #endif | |
674 | ||
675 | /* From world but DNAT to loopback address? */ | |
676 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && | |
677 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { | |
0d79641a | 678 | IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, 0, |
fc604767 JA |
679 | "ip_vs_nat_xmit_v6(): " |
680 | "stopping DNAT to loopback address"); | |
681 | goto tx_error_put; | |
682 | } | |
b3cdd2a7 JV |
683 | |
684 | /* MTU checking */ | |
d8d1f30b | 685 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 686 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
687 | if (!skb->dev) { |
688 | struct net *net = dev_net(skb_dst(skb)->dev); | |
689 | ||
690 | skb->dev = net->loopback_dev; | |
691 | } | |
3ffe533c | 692 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
0d79641a | 693 | IP_VS_DBG_RL_PKT(0, AF_INET6, pp, skb, 0, |
b3cdd2a7 | 694 | "ip_vs_nat_xmit_v6(): frag needed for"); |
fc604767 | 695 | goto tx_error_put; |
b3cdd2a7 JV |
696 | } |
697 | ||
698 | /* copy-on-write the packet before mangling it */ | |
699 | if (!skb_make_writable(skb, sizeof(struct ipv6hdr))) | |
700 | goto tx_error_put; | |
701 | ||
d8d1f30b | 702 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
b3cdd2a7 JV |
703 | goto tx_error_put; |
704 | ||
b3cdd2a7 JV |
705 | /* mangle the packet */ |
706 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp)) | |
707 | goto tx_error; | |
4e3fd7a0 | 708 | ipv6_hdr(skb)->daddr = cp->daddr.in6; |
fc604767 JA |
709 | |
710 | if (!local || !skb->dev) { | |
711 | /* drop the old route when skb is not shared */ | |
712 | skb_dst_drop(skb); | |
713 | skb_dst_set(skb, &rt->dst); | |
714 | } else { | |
715 | /* destined to loopback, do we need to change route? */ | |
716 | dst_release(&rt->dst); | |
717 | } | |
b3cdd2a7 | 718 | |
0d79641a | 719 | IP_VS_DBG_PKT(10, AF_INET6, pp, skb, 0, "After DNAT"); |
b3cdd2a7 JV |
720 | |
721 | /* FIXME: when application helper enlarges the packet and the length | |
722 | is larger than the MTU of outgoing device, there will be still | |
723 | MTU problem. */ | |
724 | ||
725 | /* Another hack: avoid icmp_send in ip_fragment */ | |
726 | skb->local_df = 1; | |
727 | ||
fc604767 | 728 | IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local); |
b3cdd2a7 JV |
729 | |
730 | LeaveFunction(10); | |
731 | return NF_STOLEN; | |
732 | ||
733 | tx_error_icmp: | |
734 | dst_link_failure(skb); | |
735 | tx_error: | |
736 | LeaveFunction(10); | |
737 | kfree_skb(skb); | |
738 | return NF_STOLEN; | |
739 | tx_error_put: | |
d8d1f30b | 740 | dst_release(&rt->dst); |
b3cdd2a7 JV |
741 | goto tx_error; |
742 | } | |
743 | #endif | |
744 | ||
1da177e4 LT |
745 | |
746 | /* | |
747 | * IP Tunneling transmitter | |
748 | * | |
749 | * This function encapsulates the packet in a new IP packet, its | |
750 | * destination will be set to cp->daddr. Most code of this function | |
751 | * is taken from ipip.c. | |
752 | * | |
753 | * It is used in VS/TUN cluster. The load balancer selects a real | |
754 | * server from a cluster based on a scheduling algorithm, | |
755 | * encapsulates the request packet and forwards it to the selected | |
756 | * server. For example, all real servers are configured with | |
757 | * "ifconfig tunl0 <Virtual IP Address> up". When the server receives | |
758 | * the encapsulated packet, it will decapsulate the packet, processe | |
759 | * the request and return the response packets directly to the client | |
760 | * without passing the load balancer. This can greatly increase the | |
761 | * scalability of virtual server. | |
762 | * | |
763 | * Used for ANY protocol | |
764 | */ | |
765 | int | |
766 | ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
767 | struct ip_vs_protocol *pp) | |
768 | { | |
769 | struct rtable *rt; /* Route to the other host */ | |
c92f5ca2 | 770 | __be32 saddr; /* Source for tunnel */ |
1da177e4 | 771 | struct net_device *tdev; /* Device to other host */ |
eddc9ec5 | 772 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 | 773 | u8 tos = old_iph->tos; |
76ab608d | 774 | __be16 df = old_iph->frag_off; |
1da177e4 | 775 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 776 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 777 | int mtu; |
f4bc17cd | 778 | int ret; |
1da177e4 LT |
779 | |
780 | EnterFunction(10); | |
781 | ||
fc604767 | 782 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 | 783 | RT_TOS(tos), IP_VS_RT_MODE_LOCAL | |
c92f5ca2 JA |
784 | IP_VS_RT_MODE_NON_LOCAL, |
785 | &saddr))) | |
1da177e4 | 786 | goto tx_error_icmp; |
fc604767 JA |
787 | if (rt->rt_flags & RTCF_LOCAL) { |
788 | ip_rt_put(rt); | |
789 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); | |
790 | } | |
1da177e4 | 791 | |
d8d1f30b | 792 | tdev = rt->dst.dev; |
1da177e4 | 793 | |
d8d1f30b | 794 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 795 | if (mtu < 68) { |
1e3e238e | 796 | IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__); |
fc604767 | 797 | goto tx_error_put; |
1da177e4 | 798 | } |
adf30907 | 799 | if (skb_dst(skb)) |
6700c270 | 800 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 801 | |
4412ec49 | 802 | df |= (old_iph->frag_off & htons(IP_DF)); |
1da177e4 | 803 | |
8f1b03a4 SH |
804 | if ((old_iph->frag_off & htons(IP_DF) && |
805 | mtu < ntohs(old_iph->tot_len) && !skb_is_gso(skb))) { | |
1da177e4 | 806 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
1e3e238e | 807 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 808 | goto tx_error_put; |
1da177e4 LT |
809 | } |
810 | ||
811 | /* | |
812 | * Okay, now see if we can stuff it in the buffer as-is. | |
813 | */ | |
814 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr); | |
815 | ||
816 | if (skb_headroom(skb) < max_headroom | |
817 | || skb_cloned(skb) || skb_shared(skb)) { | |
818 | struct sk_buff *new_skb = | |
819 | skb_realloc_headroom(skb, max_headroom); | |
820 | if (!new_skb) { | |
821 | ip_rt_put(rt); | |
822 | kfree_skb(skb); | |
1e3e238e | 823 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
1da177e4 LT |
824 | return NF_STOLEN; |
825 | } | |
5d0ba55b | 826 | consume_skb(skb); |
1da177e4 | 827 | skb = new_skb; |
eddc9ec5 | 828 | old_iph = ip_hdr(skb); |
1da177e4 LT |
829 | } |
830 | ||
714f095f | 831 | skb->transport_header = skb->network_header; |
1da177e4 LT |
832 | |
833 | /* fix old IP header checksum */ | |
834 | ip_send_check(old_iph); | |
835 | ||
e2d1bca7 ACM |
836 | skb_push(skb, sizeof(struct iphdr)); |
837 | skb_reset_network_header(skb); | |
1da177e4 LT |
838 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
839 | ||
840 | /* drop old route */ | |
adf30907 | 841 | skb_dst_drop(skb); |
d8d1f30b | 842 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
843 | |
844 | /* | |
845 | * Push down and install the IPIP header. | |
846 | */ | |
eddc9ec5 | 847 | iph = ip_hdr(skb); |
1da177e4 LT |
848 | iph->version = 4; |
849 | iph->ihl = sizeof(struct iphdr)>>2; | |
850 | iph->frag_off = df; | |
851 | iph->protocol = IPPROTO_IPIP; | |
852 | iph->tos = tos; | |
c92f5ca2 JA |
853 | iph->daddr = cp->daddr.ip; |
854 | iph->saddr = saddr; | |
1da177e4 | 855 | iph->ttl = old_iph->ttl; |
d8d1f30b | 856 | ip_select_ident(iph, &rt->dst, NULL); |
1da177e4 LT |
857 | |
858 | /* Another hack: avoid icmp_send in ip_fragment */ | |
859 | skb->local_df = 1; | |
860 | ||
f4bc17cd JA |
861 | ret = IP_VS_XMIT_TUNNEL(skb, cp); |
862 | if (ret == NF_ACCEPT) | |
863 | ip_local_out(skb); | |
864 | else if (ret == NF_DROP) | |
865 | kfree_skb(skb); | |
1da177e4 LT |
866 | |
867 | LeaveFunction(10); | |
868 | ||
869 | return NF_STOLEN; | |
870 | ||
871 | tx_error_icmp: | |
872 | dst_link_failure(skb); | |
873 | tx_error: | |
874 | kfree_skb(skb); | |
875 | LeaveFunction(10); | |
876 | return NF_STOLEN; | |
fc604767 JA |
877 | tx_error_put: |
878 | ip_rt_put(rt); | |
879 | goto tx_error; | |
1da177e4 LT |
880 | } |
881 | ||
b3cdd2a7 JV |
882 | #ifdef CONFIG_IP_VS_IPV6 |
883 | int | |
884 | ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
885 | struct ip_vs_protocol *pp) | |
886 | { | |
887 | struct rt6_info *rt; /* Route to the other host */ | |
714f095f | 888 | struct in6_addr saddr; /* Source for tunnel */ |
b3cdd2a7 JV |
889 | struct net_device *tdev; /* Device to other host */ |
890 | struct ipv6hdr *old_iph = ipv6_hdr(skb); | |
b3cdd2a7 JV |
891 | struct ipv6hdr *iph; /* Our new IP header */ |
892 | unsigned int max_headroom; /* The extra header space needed */ | |
893 | int mtu; | |
f4bc17cd | 894 | int ret; |
b3cdd2a7 JV |
895 | |
896 | EnterFunction(10); | |
897 | ||
fc604767 | 898 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, |
e58b3442 DM |
899 | &saddr, 1, (IP_VS_RT_MODE_LOCAL | |
900 | IP_VS_RT_MODE_NON_LOCAL)))) | |
b3cdd2a7 | 901 | goto tx_error_icmp; |
fc604767 JA |
902 | if (__ip_vs_is_local_route6(rt)) { |
903 | dst_release(&rt->dst); | |
904 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1); | |
905 | } | |
b3cdd2a7 | 906 | |
d8d1f30b | 907 | tdev = rt->dst.dev; |
b3cdd2a7 | 908 | |
d8d1f30b | 909 | mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr); |
714f095f | 910 | if (mtu < IPV6_MIN_MTU) { |
714f095f HS |
911 | IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__, |
912 | IPV6_MIN_MTU); | |
fc604767 | 913 | goto tx_error_put; |
b3cdd2a7 | 914 | } |
adf30907 | 915 | if (skb_dst(skb)) |
6700c270 | 916 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
b3cdd2a7 | 917 | |
8f1b03a4 SH |
918 | if (mtu < ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr) && |
919 | !skb_is_gso(skb)) { | |
cb59155f JA |
920 | if (!skb->dev) { |
921 | struct net *net = dev_net(skb_dst(skb)->dev); | |
922 | ||
923 | skb->dev = net->loopback_dev; | |
924 | } | |
3ffe533c | 925 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1e3e238e | 926 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 927 | goto tx_error_put; |
b3cdd2a7 JV |
928 | } |
929 | ||
930 | /* | |
931 | * Okay, now see if we can stuff it in the buffer as-is. | |
932 | */ | |
933 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr); | |
934 | ||
935 | if (skb_headroom(skb) < max_headroom | |
936 | || skb_cloned(skb) || skb_shared(skb)) { | |
937 | struct sk_buff *new_skb = | |
938 | skb_realloc_headroom(skb, max_headroom); | |
939 | if (!new_skb) { | |
d8d1f30b | 940 | dst_release(&rt->dst); |
b3cdd2a7 | 941 | kfree_skb(skb); |
1e3e238e | 942 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
b3cdd2a7 JV |
943 | return NF_STOLEN; |
944 | } | |
5d0ba55b | 945 | consume_skb(skb); |
b3cdd2a7 JV |
946 | skb = new_skb; |
947 | old_iph = ipv6_hdr(skb); | |
948 | } | |
949 | ||
714f095f | 950 | skb->transport_header = skb->network_header; |
b3cdd2a7 JV |
951 | |
952 | skb_push(skb, sizeof(struct ipv6hdr)); | |
953 | skb_reset_network_header(skb); | |
954 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
955 | ||
956 | /* drop old route */ | |
adf30907 | 957 | skb_dst_drop(skb); |
d8d1f30b | 958 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
959 | |
960 | /* | |
961 | * Push down and install the IPIP header. | |
962 | */ | |
963 | iph = ipv6_hdr(skb); | |
964 | iph->version = 6; | |
965 | iph->nexthdr = IPPROTO_IPV6; | |
b7b45f47 HH |
966 | iph->payload_len = old_iph->payload_len; |
967 | be16_add_cpu(&iph->payload_len, sizeof(*old_iph)); | |
b3cdd2a7 JV |
968 | iph->priority = old_iph->priority; |
969 | memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl)); | |
4e3fd7a0 AD |
970 | iph->daddr = cp->daddr.in6; |
971 | iph->saddr = saddr; | |
b3cdd2a7 JV |
972 | iph->hop_limit = old_iph->hop_limit; |
973 | ||
974 | /* Another hack: avoid icmp_send in ip_fragment */ | |
975 | skb->local_df = 1; | |
976 | ||
f4bc17cd JA |
977 | ret = IP_VS_XMIT_TUNNEL(skb, cp); |
978 | if (ret == NF_ACCEPT) | |
979 | ip6_local_out(skb); | |
980 | else if (ret == NF_DROP) | |
981 | kfree_skb(skb); | |
b3cdd2a7 JV |
982 | |
983 | LeaveFunction(10); | |
984 | ||
985 | return NF_STOLEN; | |
986 | ||
987 | tx_error_icmp: | |
988 | dst_link_failure(skb); | |
989 | tx_error: | |
990 | kfree_skb(skb); | |
991 | LeaveFunction(10); | |
992 | return NF_STOLEN; | |
fc604767 JA |
993 | tx_error_put: |
994 | dst_release(&rt->dst); | |
995 | goto tx_error; | |
b3cdd2a7 JV |
996 | } |
997 | #endif | |
998 | ||
1da177e4 LT |
999 | |
1000 | /* | |
1001 | * Direct Routing transmitter | |
1002 | * Used for ANY protocol | |
1003 | */ | |
1004 | int | |
1005 | ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
1006 | struct ip_vs_protocol *pp) | |
1007 | { | |
1008 | struct rtable *rt; /* Route to the other host */ | |
eddc9ec5 | 1009 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1010 | int mtu; |
1011 | ||
1012 | EnterFunction(10); | |
1013 | ||
fc604767 | 1014 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 CG |
1015 | RT_TOS(iph->tos), |
1016 | IP_VS_RT_MODE_LOCAL | | |
c92f5ca2 | 1017 | IP_VS_RT_MODE_NON_LOCAL, NULL))) |
1da177e4 | 1018 | goto tx_error_icmp; |
fc604767 JA |
1019 | if (rt->rt_flags & RTCF_LOCAL) { |
1020 | ip_rt_put(rt); | |
1021 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); | |
1022 | } | |
1da177e4 LT |
1023 | |
1024 | /* MTU checking */ | |
d8d1f30b | 1025 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
1026 | if ((iph->frag_off & htons(IP_DF)) && skb->len > mtu && |
1027 | !skb_is_gso(skb)) { | |
1da177e4 LT |
1028 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
1029 | ip_rt_put(rt); | |
1e3e238e | 1030 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
1da177e4 LT |
1031 | goto tx_error; |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Call ip_send_check because we are not sure it is called | |
1036 | * after ip_defrag. Is copy-on-write needed? | |
1037 | */ | |
1038 | if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) { | |
1039 | ip_rt_put(rt); | |
1040 | return NF_STOLEN; | |
1041 | } | |
eddc9ec5 | 1042 | ip_send_check(ip_hdr(skb)); |
1da177e4 LT |
1043 | |
1044 | /* drop old route */ | |
adf30907 | 1045 | skb_dst_drop(skb); |
d8d1f30b | 1046 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1047 | |
1048 | /* Another hack: avoid icmp_send in ip_fragment */ | |
1049 | skb->local_df = 1; | |
1050 | ||
fc604767 | 1051 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0); |
1da177e4 LT |
1052 | |
1053 | LeaveFunction(10); | |
1054 | return NF_STOLEN; | |
1055 | ||
1056 | tx_error_icmp: | |
1057 | dst_link_failure(skb); | |
1058 | tx_error: | |
1059 | kfree_skb(skb); | |
1060 | LeaveFunction(10); | |
1061 | return NF_STOLEN; | |
1062 | } | |
1063 | ||
b3cdd2a7 JV |
1064 | #ifdef CONFIG_IP_VS_IPV6 |
1065 | int | |
1066 | ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
1067 | struct ip_vs_protocol *pp) | |
1068 | { | |
1069 | struct rt6_info *rt; /* Route to the other host */ | |
1070 | int mtu; | |
1071 | ||
1072 | EnterFunction(10); | |
1073 | ||
fc604767 | 1074 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
e58b3442 DM |
1075 | 0, (IP_VS_RT_MODE_LOCAL | |
1076 | IP_VS_RT_MODE_NON_LOCAL)))) | |
b3cdd2a7 | 1077 | goto tx_error_icmp; |
fc604767 JA |
1078 | if (__ip_vs_is_local_route6(rt)) { |
1079 | dst_release(&rt->dst); | |
1080 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1); | |
1081 | } | |
b3cdd2a7 JV |
1082 | |
1083 | /* MTU checking */ | |
d8d1f30b | 1084 | mtu = dst_mtu(&rt->dst); |
b3cdd2a7 | 1085 | if (skb->len > mtu) { |
cb59155f JA |
1086 | if (!skb->dev) { |
1087 | struct net *net = dev_net(skb_dst(skb)->dev); | |
1088 | ||
1089 | skb->dev = net->loopback_dev; | |
1090 | } | |
3ffe533c | 1091 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
d8d1f30b | 1092 | dst_release(&rt->dst); |
1e3e238e | 1093 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
b3cdd2a7 JV |
1094 | goto tx_error; |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * Call ip_send_check because we are not sure it is called | |
1099 | * after ip_defrag. Is copy-on-write needed? | |
1100 | */ | |
1101 | skb = skb_share_check(skb, GFP_ATOMIC); | |
1102 | if (unlikely(skb == NULL)) { | |
d8d1f30b | 1103 | dst_release(&rt->dst); |
b3cdd2a7 JV |
1104 | return NF_STOLEN; |
1105 | } | |
1106 | ||
1107 | /* drop old route */ | |
adf30907 | 1108 | skb_dst_drop(skb); |
d8d1f30b | 1109 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
1110 | |
1111 | /* Another hack: avoid icmp_send in ip_fragment */ | |
1112 | skb->local_df = 1; | |
1113 | ||
fc604767 | 1114 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0); |
b3cdd2a7 JV |
1115 | |
1116 | LeaveFunction(10); | |
1117 | return NF_STOLEN; | |
1118 | ||
1119 | tx_error_icmp: | |
1120 | dst_link_failure(skb); | |
1121 | tx_error: | |
1122 | kfree_skb(skb); | |
1123 | LeaveFunction(10); | |
1124 | return NF_STOLEN; | |
1125 | } | |
1126 | #endif | |
1127 | ||
1da177e4 LT |
1128 | |
1129 | /* | |
1130 | * ICMP packet transmitter | |
1131 | * called by the ip_vs_in_icmp | |
1132 | */ | |
1133 | int | |
1134 | ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
c92f5ca2 | 1135 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum) |
1da177e4 LT |
1136 | { |
1137 | struct rtable *rt; /* Route to the other host */ | |
1138 | int mtu; | |
1139 | int rc; | |
fc604767 | 1140 | int local; |
c92f5ca2 | 1141 | int rt_mode; |
1da177e4 LT |
1142 | |
1143 | EnterFunction(10); | |
1144 | ||
1145 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be | |
1146 | forwarded directly here, because there is no need to | |
1147 | translate address/port back */ | |
1148 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { | |
1149 | if (cp->packet_xmit) | |
1150 | rc = cp->packet_xmit(skb, cp, pp); | |
1151 | else | |
1152 | rc = NF_ACCEPT; | |
1153 | /* do not touch skb anymore */ | |
1154 | atomic_inc(&cp->in_pkts); | |
1da177e4 LT |
1155 | goto out; |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * mangle and send the packet here (only for VS/NAT) | |
1160 | */ | |
1161 | ||
c92f5ca2 JA |
1162 | /* LOCALNODE from FORWARD hook is not supported */ |
1163 | rt_mode = (hooknum != NF_INET_FORWARD) ? | |
1164 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | | |
1165 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; | |
fc604767 | 1166 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 | 1167 | RT_TOS(ip_hdr(skb)->tos), |
c92f5ca2 | 1168 | rt_mode, NULL))) |
1da177e4 | 1169 | goto tx_error_icmp; |
fc604767 JA |
1170 | local = rt->rt_flags & RTCF_LOCAL; |
1171 | ||
1172 | /* | |
1173 | * Avoid duplicate tuple in reply direction for NAT traffic | |
1174 | * to local address when connection is sync-ed | |
1175 | */ | |
c0cd1156 | 1176 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
1177 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
1178 | enum ip_conntrack_info ctinfo; | |
1179 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
1180 | ||
1181 | if (ct && !nf_ct_is_untracked(ct)) { | |
1182 | IP_VS_DBG(10, "%s(): " | |
1183 | "stopping DNAT to local address %pI4\n", | |
1184 | __func__, &cp->daddr.ip); | |
1185 | goto tx_error_put; | |
1186 | } | |
1187 | } | |
1188 | #endif | |
1189 | ||
1190 | /* From world but DNAT to loopback address? */ | |
c92f5ca2 | 1191 | if (local && ipv4_is_loopback(cp->daddr.ip) && |
c7537967 | 1192 | rt_is_input_route(skb_rtable(skb))) { |
fc604767 JA |
1193 | IP_VS_DBG(1, "%s(): " |
1194 | "stopping DNAT to loopback %pI4\n", | |
1195 | __func__, &cp->daddr.ip); | |
1196 | goto tx_error_put; | |
1197 | } | |
1da177e4 LT |
1198 | |
1199 | /* MTU checking */ | |
d8d1f30b | 1200 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
1201 | if ((skb->len > mtu) && (ip_hdr(skb)->frag_off & htons(IP_DF)) && |
1202 | !skb_is_gso(skb)) { | |
1da177e4 | 1203 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
1e3e238e | 1204 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 1205 | goto tx_error_put; |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | /* copy-on-write the packet before mangling it */ | |
af1e1cf0 | 1209 | if (!skb_make_writable(skb, offset)) |
1da177e4 LT |
1210 | goto tx_error_put; |
1211 | ||
d8d1f30b | 1212 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
1da177e4 LT |
1213 | goto tx_error_put; |
1214 | ||
1da177e4 LT |
1215 | ip_vs_nat_icmp(skb, pp, cp, 0); |
1216 | ||
fc604767 JA |
1217 | if (!local) { |
1218 | /* drop the old route when skb is not shared */ | |
1219 | skb_dst_drop(skb); | |
1220 | skb_dst_set(skb, &rt->dst); | |
1221 | } else { | |
1222 | ip_rt_put(rt); | |
1223 | /* | |
1224 | * Some IPv4 replies get local address from routes, | |
1225 | * not from iph, so while we DNAT after routing | |
1226 | * we need this second input/output route. | |
1227 | */ | |
1228 | if (!__ip_vs_reroute_locally(skb)) | |
1229 | goto tx_error; | |
1230 | } | |
1231 | ||
1da177e4 LT |
1232 | /* Another hack: avoid icmp_send in ip_fragment */ |
1233 | skb->local_df = 1; | |
1234 | ||
fc604767 | 1235 | IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local); |
1da177e4 LT |
1236 | |
1237 | rc = NF_STOLEN; | |
1238 | goto out; | |
1239 | ||
1240 | tx_error_icmp: | |
1241 | dst_link_failure(skb); | |
1242 | tx_error: | |
1243 | dev_kfree_skb(skb); | |
1244 | rc = NF_STOLEN; | |
1245 | out: | |
1246 | LeaveFunction(10); | |
1247 | return rc; | |
1248 | tx_error_put: | |
1249 | ip_rt_put(rt); | |
1250 | goto tx_error; | |
1251 | } | |
b3cdd2a7 JV |
1252 | |
1253 | #ifdef CONFIG_IP_VS_IPV6 | |
1254 | int | |
1255 | ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
c92f5ca2 | 1256 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum) |
b3cdd2a7 JV |
1257 | { |
1258 | struct rt6_info *rt; /* Route to the other host */ | |
1259 | int mtu; | |
1260 | int rc; | |
fc604767 | 1261 | int local; |
c92f5ca2 | 1262 | int rt_mode; |
b3cdd2a7 JV |
1263 | |
1264 | EnterFunction(10); | |
1265 | ||
1266 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be | |
1267 | forwarded directly here, because there is no need to | |
1268 | translate address/port back */ | |
1269 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { | |
1270 | if (cp->packet_xmit) | |
1271 | rc = cp->packet_xmit(skb, cp, pp); | |
1272 | else | |
1273 | rc = NF_ACCEPT; | |
1274 | /* do not touch skb anymore */ | |
1275 | atomic_inc(&cp->in_pkts); | |
1276 | goto out; | |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * mangle and send the packet here (only for VS/NAT) | |
1281 | */ | |
1282 | ||
c92f5ca2 JA |
1283 | /* LOCALNODE from FORWARD hook is not supported */ |
1284 | rt_mode = (hooknum != NF_INET_FORWARD) ? | |
1285 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | | |
1286 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; | |
fc604767 | 1287 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
c92f5ca2 | 1288 | 0, rt_mode))) |
b3cdd2a7 JV |
1289 | goto tx_error_icmp; |
1290 | ||
fc604767 JA |
1291 | local = __ip_vs_is_local_route6(rt); |
1292 | /* | |
1293 | * Avoid duplicate tuple in reply direction for NAT traffic | |
1294 | * to local address when connection is sync-ed | |
1295 | */ | |
c0cd1156 | 1296 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
1297 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
1298 | enum ip_conntrack_info ctinfo; | |
1299 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
1300 | ||
1301 | if (ct && !nf_ct_is_untracked(ct)) { | |
1302 | IP_VS_DBG(10, "%s(): " | |
1303 | "stopping DNAT to local address %pI6\n", | |
1304 | __func__, &cp->daddr.in6); | |
1305 | goto tx_error_put; | |
1306 | } | |
1307 | } | |
1308 | #endif | |
1309 | ||
1310 | /* From world but DNAT to loopback address? */ | |
1311 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && | |
1312 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { | |
1313 | IP_VS_DBG(1, "%s(): " | |
1314 | "stopping DNAT to loopback %pI6\n", | |
1315 | __func__, &cp->daddr.in6); | |
1316 | goto tx_error_put; | |
1317 | } | |
1318 | ||
b3cdd2a7 | 1319 | /* MTU checking */ |
d8d1f30b | 1320 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 1321 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
1322 | if (!skb->dev) { |
1323 | struct net *net = dev_net(skb_dst(skb)->dev); | |
1324 | ||
1325 | skb->dev = net->loopback_dev; | |
1326 | } | |
3ffe533c | 1327 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1e3e238e | 1328 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 1329 | goto tx_error_put; |
b3cdd2a7 JV |
1330 | } |
1331 | ||
1332 | /* copy-on-write the packet before mangling it */ | |
1333 | if (!skb_make_writable(skb, offset)) | |
1334 | goto tx_error_put; | |
1335 | ||
d8d1f30b | 1336 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
b3cdd2a7 JV |
1337 | goto tx_error_put; |
1338 | ||
b3cdd2a7 JV |
1339 | ip_vs_nat_icmp_v6(skb, pp, cp, 0); |
1340 | ||
fc604767 JA |
1341 | if (!local || !skb->dev) { |
1342 | /* drop the old route when skb is not shared */ | |
1343 | skb_dst_drop(skb); | |
1344 | skb_dst_set(skb, &rt->dst); | |
1345 | } else { | |
1346 | /* destined to loopback, do we need to change route? */ | |
1347 | dst_release(&rt->dst); | |
1348 | } | |
1349 | ||
b3cdd2a7 JV |
1350 | /* Another hack: avoid icmp_send in ip_fragment */ |
1351 | skb->local_df = 1; | |
1352 | ||
fc604767 | 1353 | IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local); |
b3cdd2a7 JV |
1354 | |
1355 | rc = NF_STOLEN; | |
1356 | goto out; | |
1357 | ||
1358 | tx_error_icmp: | |
1359 | dst_link_failure(skb); | |
1360 | tx_error: | |
1361 | dev_kfree_skb(skb); | |
1362 | rc = NF_STOLEN; | |
1363 | out: | |
1364 | LeaveFunction(10); | |
1365 | return rc; | |
1366 | tx_error_put: | |
d8d1f30b | 1367 | dst_release(&rt->dst); |
b3cdd2a7 JV |
1368 | goto tx_error; |
1369 | } | |
1370 | #endif |