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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 | */ | |
f2edb9f7 | 52 | IP_VS_RT_MODE_CONNECT = 8, /* Always bind route to saddr */ |
17a8f8e3 | 53 | }; |
1da177e4 LT |
54 | |
55 | /* | |
56 | * Destination cache to speed up outgoing route lookup | |
57 | */ | |
58 | static inline void | |
714f095f HS |
59 | __ip_vs_dst_set(struct ip_vs_dest *dest, u32 rtos, struct dst_entry *dst, |
60 | u32 dst_cookie) | |
1da177e4 LT |
61 | { |
62 | struct dst_entry *old_dst; | |
63 | ||
64 | old_dst = dest->dst_cache; | |
65 | dest->dst_cache = dst; | |
66 | dest->dst_rtos = rtos; | |
714f095f | 67 | dest->dst_cookie = dst_cookie; |
1da177e4 LT |
68 | dst_release(old_dst); |
69 | } | |
70 | ||
71 | static inline struct dst_entry * | |
714f095f | 72 | __ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos) |
1da177e4 LT |
73 | { |
74 | struct dst_entry *dst = dest->dst_cache; | |
75 | ||
76 | if (!dst) | |
77 | return NULL; | |
714f095f HS |
78 | if ((dst->obsolete || rtos != dest->dst_rtos) && |
79 | dst->ops->check(dst, dest->dst_cookie) == NULL) { | |
1da177e4 LT |
80 | dest->dst_cache = NULL; |
81 | dst_release(dst); | |
82 | return NULL; | |
83 | } | |
84 | dst_hold(dst); | |
85 | return dst; | |
86 | } | |
87 | ||
f2edb9f7 JA |
88 | /* Get route to daddr, update *saddr, optionally bind route to saddr */ |
89 | static struct rtable *do_output_route4(struct net *net, __be32 daddr, | |
90 | u32 rtos, int rt_mode, __be32 *saddr) | |
91 | { | |
92 | struct flowi4 fl4; | |
93 | struct rtable *rt; | |
94 | int loop = 0; | |
95 | ||
96 | memset(&fl4, 0, sizeof(fl4)); | |
97 | fl4.daddr = daddr; | |
98 | fl4.saddr = (rt_mode & IP_VS_RT_MODE_CONNECT) ? *saddr : 0; | |
99 | fl4.flowi4_tos = rtos; | |
100 | ||
101 | retry: | |
102 | rt = ip_route_output_key(net, &fl4); | |
103 | if (IS_ERR(rt)) { | |
104 | /* Invalid saddr ? */ | |
105 | if (PTR_ERR(rt) == -EINVAL && *saddr && | |
106 | rt_mode & IP_VS_RT_MODE_CONNECT && !loop) { | |
107 | *saddr = 0; | |
108 | flowi4_update_output(&fl4, 0, rtos, daddr, 0); | |
109 | goto retry; | |
110 | } | |
111 | IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", &daddr); | |
112 | return NULL; | |
113 | } else if (!*saddr && rt_mode & IP_VS_RT_MODE_CONNECT && fl4.saddr) { | |
114 | ip_rt_put(rt); | |
115 | *saddr = fl4.saddr; | |
116 | flowi4_update_output(&fl4, 0, rtos, daddr, fl4.saddr); | |
117 | loop++; | |
118 | goto retry; | |
119 | } | |
120 | *saddr = fl4.saddr; | |
121 | return rt; | |
122 | } | |
123 | ||
17a8f8e3 | 124 | /* Get route to destination or remote server */ |
ad1b30b1 | 125 | static struct rtable * |
fc604767 | 126 | __ip_vs_get_out_rt(struct sk_buff *skb, struct ip_vs_dest *dest, |
c92f5ca2 | 127 | __be32 daddr, u32 rtos, int rt_mode, __be32 *ret_saddr) |
1da177e4 | 128 | { |
fc604767 | 129 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 130 | struct rtable *rt; /* Route to the other host */ |
fc604767 JA |
131 | struct rtable *ort; /* Original route */ |
132 | int local; | |
1da177e4 LT |
133 | |
134 | if (dest) { | |
135 | spin_lock(&dest->dst_lock); | |
136 | if (!(rt = (struct rtable *) | |
714f095f | 137 | __ip_vs_dst_check(dest, rtos))) { |
f2edb9f7 JA |
138 | rt = do_output_route4(net, dest->addr.ip, rtos, |
139 | rt_mode, &dest->dst_saddr.ip); | |
140 | if (!rt) { | |
1da177e4 | 141 | spin_unlock(&dest->dst_lock); |
1da177e4 LT |
142 | return NULL; |
143 | } | |
714f095f | 144 | __ip_vs_dst_set(dest, rtos, dst_clone(&rt->dst), 0); |
c92f5ca2 JA |
145 | IP_VS_DBG(10, "new dst %pI4, src %pI4, refcnt=%d, " |
146 | "rtos=%X\n", | |
147 | &dest->addr.ip, &dest->dst_saddr.ip, | |
d8d1f30b | 148 | atomic_read(&rt->dst.__refcnt), rtos); |
1da177e4 | 149 | } |
44e3125c | 150 | daddr = dest->addr.ip; |
c92f5ca2 JA |
151 | if (ret_saddr) |
152 | *ret_saddr = dest->dst_saddr.ip; | |
1da177e4 LT |
153 | spin_unlock(&dest->dst_lock); |
154 | } else { | |
f2edb9f7 | 155 | __be32 saddr = htonl(INADDR_ANY); |
c92f5ca2 | 156 | |
f2edb9f7 JA |
157 | /* For such unconfigured boxes avoid many route lookups |
158 | * for performance reasons because we do not remember saddr | |
159 | */ | |
160 | rt_mode &= ~IP_VS_RT_MODE_CONNECT; | |
161 | rt = do_output_route4(net, daddr, rtos, rt_mode, &saddr); | |
162 | if (!rt) | |
1da177e4 | 163 | return NULL; |
c92f5ca2 | 164 | if (ret_saddr) |
f2edb9f7 | 165 | *ret_saddr = saddr; |
1da177e4 LT |
166 | } |
167 | ||
fc604767 | 168 | local = rt->rt_flags & RTCF_LOCAL; |
17a8f8e3 CG |
169 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
170 | rt_mode)) { | |
fc604767 JA |
171 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI4\n", |
172 | (rt->rt_flags & RTCF_LOCAL) ? | |
44e3125c | 173 | "local":"non-local", &daddr); |
fc604767 JA |
174 | ip_rt_put(rt); |
175 | return NULL; | |
176 | } | |
17a8f8e3 CG |
177 | if (local && !(rt_mode & IP_VS_RT_MODE_RDR) && |
178 | !((ort = skb_rtable(skb)) && ort->rt_flags & RTCF_LOCAL)) { | |
fc604767 JA |
179 | IP_VS_DBG_RL("Redirect from non-local address %pI4 to local " |
180 | "requires NAT method, dest: %pI4\n", | |
44e3125c | 181 | &ip_hdr(skb)->daddr, &daddr); |
fc604767 JA |
182 | ip_rt_put(rt); |
183 | return NULL; | |
184 | } | |
185 | if (unlikely(!local && ipv4_is_loopback(ip_hdr(skb)->saddr))) { | |
186 | IP_VS_DBG_RL("Stopping traffic from loopback address %pI4 " | |
187 | "to non-local address, dest: %pI4\n", | |
44e3125c | 188 | &ip_hdr(skb)->saddr, &daddr); |
fc604767 JA |
189 | ip_rt_put(rt); |
190 | return NULL; | |
191 | } | |
192 | ||
1da177e4 LT |
193 | return rt; |
194 | } | |
195 | ||
fc604767 JA |
196 | /* Reroute packet to local IPv4 stack after DNAT */ |
197 | static int | |
198 | __ip_vs_reroute_locally(struct sk_buff *skb) | |
199 | { | |
200 | struct rtable *rt = skb_rtable(skb); | |
201 | struct net_device *dev = rt->dst.dev; | |
202 | struct net *net = dev_net(dev); | |
203 | struct iphdr *iph = ip_hdr(skb); | |
204 | ||
c7537967 | 205 | if (rt_is_input_route(rt)) { |
fc604767 JA |
206 | unsigned long orefdst = skb->_skb_refdst; |
207 | ||
208 | if (ip_route_input(skb, iph->daddr, iph->saddr, | |
209 | iph->tos, skb->dev)) | |
210 | return 0; | |
211 | refdst_drop(orefdst); | |
212 | } else { | |
9d6ec938 DM |
213 | struct flowi4 fl4 = { |
214 | .daddr = iph->daddr, | |
215 | .saddr = iph->saddr, | |
216 | .flowi4_tos = RT_TOS(iph->tos), | |
217 | .flowi4_mark = skb->mark, | |
fc604767 | 218 | }; |
fc604767 | 219 | |
9d6ec938 | 220 | rt = ip_route_output_key(net, &fl4); |
b23dd4fe | 221 | if (IS_ERR(rt)) |
fc604767 JA |
222 | return 0; |
223 | if (!(rt->rt_flags & RTCF_LOCAL)) { | |
224 | ip_rt_put(rt); | |
225 | return 0; | |
226 | } | |
227 | /* Drop old route. */ | |
228 | skb_dst_drop(skb); | |
229 | skb_dst_set(skb, &rt->dst); | |
230 | } | |
231 | return 1; | |
232 | } | |
233 | ||
38cdcc9a | 234 | #ifdef CONFIG_IP_VS_IPV6 |
714f095f | 235 | |
fc604767 JA |
236 | static inline int __ip_vs_is_local_route6(struct rt6_info *rt) |
237 | { | |
d1918542 | 238 | return rt->dst.dev && rt->dst.dev->flags & IFF_LOOPBACK; |
fc604767 JA |
239 | } |
240 | ||
714f095f HS |
241 | static struct dst_entry * |
242 | __ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr, | |
243 | struct in6_addr *ret_saddr, int do_xfrm) | |
244 | { | |
245 | struct dst_entry *dst; | |
4c9483b2 DM |
246 | struct flowi6 fl6 = { |
247 | .daddr = *daddr, | |
714f095f HS |
248 | }; |
249 | ||
4c9483b2 | 250 | dst = ip6_route_output(net, NULL, &fl6); |
714f095f HS |
251 | if (dst->error) |
252 | goto out_err; | |
253 | if (!ret_saddr) | |
254 | return dst; | |
4c9483b2 | 255 | if (ipv6_addr_any(&fl6.saddr) && |
714f095f | 256 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, |
4c9483b2 | 257 | &fl6.daddr, 0, &fl6.saddr) < 0) |
714f095f | 258 | goto out_err; |
452edd59 | 259 | if (do_xfrm) { |
4c9483b2 | 260 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 DM |
261 | if (IS_ERR(dst)) { |
262 | dst = NULL; | |
263 | goto out_err; | |
264 | } | |
265 | } | |
4e3fd7a0 | 266 | *ret_saddr = fl6.saddr; |
714f095f HS |
267 | return dst; |
268 | ||
269 | out_err: | |
270 | dst_release(dst); | |
271 | IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr); | |
272 | return NULL; | |
273 | } | |
274 | ||
fc604767 JA |
275 | /* |
276 | * Get route to destination or remote server | |
fc604767 | 277 | */ |
38cdcc9a | 278 | static struct rt6_info * |
fc604767 JA |
279 | __ip_vs_get_out_rt_v6(struct sk_buff *skb, struct ip_vs_dest *dest, |
280 | struct in6_addr *daddr, struct in6_addr *ret_saddr, | |
281 | int do_xfrm, int rt_mode) | |
38cdcc9a | 282 | { |
fc604767 | 283 | struct net *net = dev_net(skb_dst(skb)->dev); |
38cdcc9a | 284 | struct rt6_info *rt; /* Route to the other host */ |
fc604767 | 285 | struct rt6_info *ort; /* Original route */ |
714f095f | 286 | struct dst_entry *dst; |
fc604767 | 287 | int local; |
38cdcc9a JV |
288 | |
289 | if (dest) { | |
290 | spin_lock(&dest->dst_lock); | |
714f095f | 291 | rt = (struct rt6_info *)__ip_vs_dst_check(dest, 0); |
38cdcc9a | 292 | if (!rt) { |
714f095f | 293 | u32 cookie; |
38cdcc9a | 294 | |
714f095f | 295 | dst = __ip_vs_route_output_v6(net, &dest->addr.in6, |
c92f5ca2 | 296 | &dest->dst_saddr.in6, |
714f095f HS |
297 | do_xfrm); |
298 | if (!dst) { | |
38cdcc9a | 299 | spin_unlock(&dest->dst_lock); |
38cdcc9a JV |
300 | return NULL; |
301 | } | |
714f095f HS |
302 | rt = (struct rt6_info *) dst; |
303 | cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
304 | __ip_vs_dst_set(dest, 0, dst_clone(&rt->dst), cookie); | |
305 | IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n", | |
c92f5ca2 | 306 | &dest->addr.in6, &dest->dst_saddr.in6, |
d8d1f30b | 307 | atomic_read(&rt->dst.__refcnt)); |
38cdcc9a | 308 | } |
714f095f | 309 | if (ret_saddr) |
4e3fd7a0 | 310 | *ret_saddr = dest->dst_saddr.in6; |
38cdcc9a JV |
311 | spin_unlock(&dest->dst_lock); |
312 | } else { | |
fc604767 | 313 | dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm); |
714f095f | 314 | if (!dst) |
38cdcc9a | 315 | return NULL; |
714f095f | 316 | rt = (struct rt6_info *) dst; |
38cdcc9a JV |
317 | } |
318 | ||
fc604767 | 319 | local = __ip_vs_is_local_route6(rt); |
e58b3442 DM |
320 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
321 | rt_mode)) { | |
fc604767 JA |
322 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI6\n", |
323 | local ? "local":"non-local", daddr); | |
324 | dst_release(&rt->dst); | |
325 | return NULL; | |
326 | } | |
e58b3442 | 327 | if (local && !(rt_mode & IP_VS_RT_MODE_RDR) && |
fc604767 JA |
328 | !((ort = (struct rt6_info *) skb_dst(skb)) && |
329 | __ip_vs_is_local_route6(ort))) { | |
330 | IP_VS_DBG_RL("Redirect from non-local address %pI6 to local " | |
331 | "requires NAT method, dest: %pI6\n", | |
332 | &ipv6_hdr(skb)->daddr, daddr); | |
333 | dst_release(&rt->dst); | |
334 | return NULL; | |
335 | } | |
336 | if (unlikely(!local && (!skb->dev || skb->dev->flags & IFF_LOOPBACK) && | |
337 | ipv6_addr_type(&ipv6_hdr(skb)->saddr) & | |
338 | IPV6_ADDR_LOOPBACK)) { | |
339 | IP_VS_DBG_RL("Stopping traffic from loopback address %pI6 " | |
340 | "to non-local address, dest: %pI6\n", | |
341 | &ipv6_hdr(skb)->saddr, daddr); | |
342 | dst_release(&rt->dst); | |
343 | return NULL; | |
344 | } | |
345 | ||
38cdcc9a JV |
346 | return rt; |
347 | } | |
348 | #endif | |
349 | ||
1da177e4 LT |
350 | |
351 | /* | |
352 | * Release dest->dst_cache before a dest is removed | |
353 | */ | |
354 | void | |
355 | ip_vs_dst_reset(struct ip_vs_dest *dest) | |
356 | { | |
357 | struct dst_entry *old_dst; | |
358 | ||
359 | old_dst = dest->dst_cache; | |
360 | dest->dst_cache = NULL; | |
361 | dst_release(old_dst); | |
f2edb9f7 | 362 | dest->dst_saddr.ip = 0; |
1da177e4 LT |
363 | } |
364 | ||
f4bc17cd JA |
365 | #define IP_VS_XMIT_TUNNEL(skb, cp) \ |
366 | ({ \ | |
367 | int __ret = NF_ACCEPT; \ | |
368 | \ | |
cf356d69 | 369 | (skb)->ipvs_property = 1; \ |
f4bc17cd | 370 | if (unlikely((cp)->flags & IP_VS_CONN_F_NFCT)) \ |
3c2de2ae | 371 | __ret = ip_vs_confirm_conntrack(skb); \ |
f4bc17cd JA |
372 | if (__ret == NF_ACCEPT) { \ |
373 | nf_reset(skb); \ | |
4256f1aa | 374 | skb_forward_csum(skb); \ |
f4bc17cd JA |
375 | } \ |
376 | __ret; \ | |
377 | }) | |
378 | ||
fc604767 | 379 | #define IP_VS_XMIT_NAT(pf, skb, cp, local) \ |
1da177e4 | 380 | do { \ |
cf356d69 | 381 | (skb)->ipvs_property = 1; \ |
f4bc17cd | 382 | if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \ |
cf356d69 | 383 | ip_vs_notrack(skb); \ |
f4bc17cd JA |
384 | else \ |
385 | ip_vs_update_conntrack(skb, cp, 1); \ | |
fc604767 JA |
386 | if (local) \ |
387 | return NF_ACCEPT; \ | |
ccc7911f | 388 | skb_forward_csum(skb); \ |
38cdcc9a | 389 | NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \ |
f4bc17cd JA |
390 | skb_dst(skb)->dev, dst_output); \ |
391 | } while (0) | |
392 | ||
fc604767 | 393 | #define IP_VS_XMIT(pf, skb, cp, local) \ |
f4bc17cd | 394 | do { \ |
cf356d69 | 395 | (skb)->ipvs_property = 1; \ |
f4bc17cd | 396 | if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \ |
cf356d69 | 397 | ip_vs_notrack(skb); \ |
fc604767 JA |
398 | if (local) \ |
399 | return NF_ACCEPT; \ | |
f4bc17cd JA |
400 | skb_forward_csum(skb); \ |
401 | NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \ | |
402 | skb_dst(skb)->dev, dst_output); \ | |
1da177e4 LT |
403 | } while (0) |
404 | ||
405 | ||
406 | /* | |
407 | * NULL transmitter (do nothing except return NF_ACCEPT) | |
408 | */ | |
409 | int | |
410 | ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
411 | struct ip_vs_protocol *pp) | |
412 | { | |
413 | /* we do not touch skb and do not need pskb ptr */ | |
fc604767 | 414 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); |
1da177e4 LT |
415 | } |
416 | ||
417 | ||
418 | /* | |
419 | * Bypass transmitter | |
420 | * Let packets bypass the destination when the destination is not | |
421 | * available, it may be only used in transparent cache cluster. | |
422 | */ | |
423 | int | |
424 | ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
425 | struct ip_vs_protocol *pp) | |
426 | { | |
427 | struct rtable *rt; /* Route to the other host */ | |
eddc9ec5 | 428 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 429 | int mtu; |
1da177e4 LT |
430 | |
431 | EnterFunction(10); | |
432 | ||
17a8f8e3 | 433 | if (!(rt = __ip_vs_get_out_rt(skb, NULL, iph->daddr, RT_TOS(iph->tos), |
c92f5ca2 | 434 | IP_VS_RT_MODE_NON_LOCAL, NULL))) |
1da177e4 | 435 | goto tx_error_icmp; |
1da177e4 LT |
436 | |
437 | /* MTU checking */ | |
d8d1f30b | 438 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
439 | if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) && |
440 | !skb_is_gso(skb)) { | |
1da177e4 LT |
441 | ip_rt_put(rt); |
442 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); | |
1e3e238e | 443 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
1da177e4 LT |
444 | goto tx_error; |
445 | } | |
446 | ||
447 | /* | |
448 | * Call ip_send_check because we are not sure it is called | |
449 | * after ip_defrag. Is copy-on-write needed? | |
450 | */ | |
451 | if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) { | |
452 | ip_rt_put(rt); | |
453 | return NF_STOLEN; | |
454 | } | |
eddc9ec5 | 455 | ip_send_check(ip_hdr(skb)); |
1da177e4 LT |
456 | |
457 | /* drop old route */ | |
adf30907 | 458 | skb_dst_drop(skb); |
d8d1f30b | 459 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
460 | |
461 | /* Another hack: avoid icmp_send in ip_fragment */ | |
462 | skb->local_df = 1; | |
463 | ||
fc604767 | 464 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0); |
1da177e4 LT |
465 | |
466 | LeaveFunction(10); | |
467 | return NF_STOLEN; | |
468 | ||
469 | tx_error_icmp: | |
470 | dst_link_failure(skb); | |
471 | tx_error: | |
472 | kfree_skb(skb); | |
473 | LeaveFunction(10); | |
474 | return NF_STOLEN; | |
475 | } | |
476 | ||
b3cdd2a7 JV |
477 | #ifdef CONFIG_IP_VS_IPV6 |
478 | int | |
479 | ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
480 | struct ip_vs_protocol *pp) | |
481 | { | |
482 | struct rt6_info *rt; /* Route to the other host */ | |
483 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
484 | int mtu; | |
b3cdd2a7 JV |
485 | |
486 | EnterFunction(10); | |
487 | ||
e58b3442 DM |
488 | if (!(rt = __ip_vs_get_out_rt_v6(skb, NULL, &iph->daddr, NULL, 0, |
489 | IP_VS_RT_MODE_NON_LOCAL))) | |
b3cdd2a7 | 490 | goto tx_error_icmp; |
b3cdd2a7 JV |
491 | |
492 | /* MTU checking */ | |
d8d1f30b | 493 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 494 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
495 | if (!skb->dev) { |
496 | struct net *net = dev_net(skb_dst(skb)->dev); | |
497 | ||
498 | skb->dev = net->loopback_dev; | |
499 | } | |
3ffe533c | 500 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
cb59155f | 501 | dst_release(&rt->dst); |
1e3e238e | 502 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
b3cdd2a7 JV |
503 | goto tx_error; |
504 | } | |
505 | ||
506 | /* | |
507 | * Call ip_send_check because we are not sure it is called | |
508 | * after ip_defrag. Is copy-on-write needed? | |
509 | */ | |
510 | skb = skb_share_check(skb, GFP_ATOMIC); | |
511 | if (unlikely(skb == NULL)) { | |
d8d1f30b | 512 | dst_release(&rt->dst); |
b3cdd2a7 JV |
513 | return NF_STOLEN; |
514 | } | |
515 | ||
516 | /* drop old route */ | |
adf30907 | 517 | skb_dst_drop(skb); |
d8d1f30b | 518 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
519 | |
520 | /* Another hack: avoid icmp_send in ip_fragment */ | |
521 | skb->local_df = 1; | |
522 | ||
fc604767 | 523 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0); |
b3cdd2a7 JV |
524 | |
525 | LeaveFunction(10); | |
526 | return NF_STOLEN; | |
527 | ||
528 | tx_error_icmp: | |
529 | dst_link_failure(skb); | |
530 | tx_error: | |
531 | kfree_skb(skb); | |
532 | LeaveFunction(10); | |
533 | return NF_STOLEN; | |
534 | } | |
535 | #endif | |
1da177e4 LT |
536 | |
537 | /* | |
538 | * NAT transmitter (only for outside-to-inside nat forwarding) | |
539 | * Not used for related ICMP | |
540 | */ | |
541 | int | |
542 | ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
543 | struct ip_vs_protocol *pp) | |
544 | { | |
545 | struct rtable *rt; /* Route to the other host */ | |
546 | int mtu; | |
eddc9ec5 | 547 | struct iphdr *iph = ip_hdr(skb); |
fc604767 | 548 | int local; |
1da177e4 LT |
549 | |
550 | EnterFunction(10); | |
551 | ||
552 | /* check if it is a connection of no-client-port */ | |
553 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { | |
014d730d | 554 | __be16 _pt, *p; |
1da177e4 LT |
555 | p = skb_header_pointer(skb, iph->ihl*4, sizeof(_pt), &_pt); |
556 | if (p == NULL) | |
557 | goto tx_error; | |
558 | ip_vs_conn_fill_cport(cp, *p); | |
559 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); | |
560 | } | |
561 | ||
fc604767 | 562 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 CG |
563 | RT_TOS(iph->tos), |
564 | IP_VS_RT_MODE_LOCAL | | |
565 | IP_VS_RT_MODE_NON_LOCAL | | |
c92f5ca2 | 566 | IP_VS_RT_MODE_RDR, NULL))) |
1da177e4 | 567 | goto tx_error_icmp; |
fc604767 JA |
568 | local = rt->rt_flags & RTCF_LOCAL; |
569 | /* | |
570 | * Avoid duplicate tuple in reply direction for NAT traffic | |
571 | * to local address when connection is sync-ed | |
572 | */ | |
c0cd1156 | 573 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
574 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
575 | enum ip_conntrack_info ctinfo; | |
576 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
577 | ||
578 | if (ct && !nf_ct_is_untracked(ct)) { | |
0d79641a JA |
579 | IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0, |
580 | "ip_vs_nat_xmit(): " | |
fc604767 JA |
581 | "stopping DNAT to local address"); |
582 | goto tx_error_put; | |
583 | } | |
584 | } | |
585 | #endif | |
586 | ||
587 | /* From world but DNAT to loopback address? */ | |
c92f5ca2 | 588 | if (local && ipv4_is_loopback(cp->daddr.ip) && |
c7537967 | 589 | rt_is_input_route(skb_rtable(skb))) { |
0d79641a | 590 | IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): " |
fc604767 JA |
591 | "stopping DNAT to loopback address"); |
592 | goto tx_error_put; | |
593 | } | |
1da177e4 LT |
594 | |
595 | /* MTU checking */ | |
d8d1f30b | 596 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
597 | if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) && |
598 | !skb_is_gso(skb)) { | |
1da177e4 | 599 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
0d79641a JA |
600 | IP_VS_DBG_RL_PKT(0, AF_INET, pp, skb, 0, |
601 | "ip_vs_nat_xmit(): frag needed for"); | |
fc604767 | 602 | goto tx_error_put; |
1da177e4 LT |
603 | } |
604 | ||
605 | /* copy-on-write the packet before mangling it */ | |
af1e1cf0 | 606 | if (!skb_make_writable(skb, sizeof(struct iphdr))) |
1da177e4 LT |
607 | goto tx_error_put; |
608 | ||
d8d1f30b | 609 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
1da177e4 LT |
610 | goto tx_error_put; |
611 | ||
1da177e4 | 612 | /* mangle the packet */ |
3db05fea | 613 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp)) |
fc604767 | 614 | goto tx_error_put; |
e7ade46a | 615 | ip_hdr(skb)->daddr = cp->daddr.ip; |
eddc9ec5 | 616 | ip_send_check(ip_hdr(skb)); |
1da177e4 | 617 | |
fc604767 JA |
618 | if (!local) { |
619 | /* drop old route */ | |
620 | skb_dst_drop(skb); | |
621 | skb_dst_set(skb, &rt->dst); | |
622 | } else { | |
623 | ip_rt_put(rt); | |
624 | /* | |
625 | * Some IPv4 replies get local address from routes, | |
626 | * not from iph, so while we DNAT after routing | |
627 | * we need this second input/output route. | |
628 | */ | |
629 | if (!__ip_vs_reroute_locally(skb)) | |
630 | goto tx_error; | |
631 | } | |
632 | ||
0d79641a | 633 | IP_VS_DBG_PKT(10, AF_INET, pp, skb, 0, "After DNAT"); |
1da177e4 LT |
634 | |
635 | /* FIXME: when application helper enlarges the packet and the length | |
636 | is larger than the MTU of outgoing device, there will be still | |
637 | MTU problem. */ | |
638 | ||
639 | /* Another hack: avoid icmp_send in ip_fragment */ | |
640 | skb->local_df = 1; | |
641 | ||
fc604767 | 642 | IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local); |
1da177e4 LT |
643 | |
644 | LeaveFunction(10); | |
645 | return NF_STOLEN; | |
646 | ||
647 | tx_error_icmp: | |
648 | dst_link_failure(skb); | |
649 | tx_error: | |
1da177e4 | 650 | kfree_skb(skb); |
f4bc17cd | 651 | LeaveFunction(10); |
1da177e4 LT |
652 | return NF_STOLEN; |
653 | tx_error_put: | |
654 | ip_rt_put(rt); | |
655 | goto tx_error; | |
656 | } | |
657 | ||
b3cdd2a7 JV |
658 | #ifdef CONFIG_IP_VS_IPV6 |
659 | int | |
660 | ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
661 | struct ip_vs_protocol *pp) | |
662 | { | |
663 | struct rt6_info *rt; /* Route to the other host */ | |
664 | int mtu; | |
fc604767 | 665 | int local; |
b3cdd2a7 JV |
666 | |
667 | EnterFunction(10); | |
668 | ||
669 | /* check if it is a connection of no-client-port */ | |
670 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { | |
671 | __be16 _pt, *p; | |
672 | p = skb_header_pointer(skb, sizeof(struct ipv6hdr), | |
673 | sizeof(_pt), &_pt); | |
674 | if (p == NULL) | |
675 | goto tx_error; | |
676 | ip_vs_conn_fill_cport(cp, *p); | |
677 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); | |
678 | } | |
679 | ||
fc604767 | 680 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
e58b3442 DM |
681 | 0, (IP_VS_RT_MODE_LOCAL | |
682 | IP_VS_RT_MODE_NON_LOCAL | | |
683 | IP_VS_RT_MODE_RDR)))) | |
b3cdd2a7 | 684 | goto tx_error_icmp; |
fc604767 JA |
685 | local = __ip_vs_is_local_route6(rt); |
686 | /* | |
687 | * Avoid duplicate tuple in reply direction for NAT traffic | |
688 | * to local address when connection is sync-ed | |
689 | */ | |
c0cd1156 | 690 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
691 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
692 | enum ip_conntrack_info ctinfo; | |
693 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
694 | ||
695 | if (ct && !nf_ct_is_untracked(ct)) { | |
0d79641a | 696 | IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0, |
fc604767 JA |
697 | "ip_vs_nat_xmit_v6(): " |
698 | "stopping DNAT to local address"); | |
699 | goto tx_error_put; | |
700 | } | |
701 | } | |
702 | #endif | |
703 | ||
704 | /* From world but DNAT to loopback address? */ | |
705 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && | |
706 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { | |
0d79641a | 707 | IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, 0, |
fc604767 JA |
708 | "ip_vs_nat_xmit_v6(): " |
709 | "stopping DNAT to loopback address"); | |
710 | goto tx_error_put; | |
711 | } | |
b3cdd2a7 JV |
712 | |
713 | /* MTU checking */ | |
d8d1f30b | 714 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 715 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
716 | if (!skb->dev) { |
717 | struct net *net = dev_net(skb_dst(skb)->dev); | |
718 | ||
719 | skb->dev = net->loopback_dev; | |
720 | } | |
3ffe533c | 721 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
0d79641a | 722 | IP_VS_DBG_RL_PKT(0, AF_INET6, pp, skb, 0, |
b3cdd2a7 | 723 | "ip_vs_nat_xmit_v6(): frag needed for"); |
fc604767 | 724 | goto tx_error_put; |
b3cdd2a7 JV |
725 | } |
726 | ||
727 | /* copy-on-write the packet before mangling it */ | |
728 | if (!skb_make_writable(skb, sizeof(struct ipv6hdr))) | |
729 | goto tx_error_put; | |
730 | ||
d8d1f30b | 731 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
b3cdd2a7 JV |
732 | goto tx_error_put; |
733 | ||
b3cdd2a7 JV |
734 | /* mangle the packet */ |
735 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp)) | |
736 | goto tx_error; | |
4e3fd7a0 | 737 | ipv6_hdr(skb)->daddr = cp->daddr.in6; |
fc604767 JA |
738 | |
739 | if (!local || !skb->dev) { | |
740 | /* drop the old route when skb is not shared */ | |
741 | skb_dst_drop(skb); | |
742 | skb_dst_set(skb, &rt->dst); | |
743 | } else { | |
744 | /* destined to loopback, do we need to change route? */ | |
745 | dst_release(&rt->dst); | |
746 | } | |
b3cdd2a7 | 747 | |
0d79641a | 748 | IP_VS_DBG_PKT(10, AF_INET6, pp, skb, 0, "After DNAT"); |
b3cdd2a7 JV |
749 | |
750 | /* FIXME: when application helper enlarges the packet and the length | |
751 | is larger than the MTU of outgoing device, there will be still | |
752 | MTU problem. */ | |
753 | ||
754 | /* Another hack: avoid icmp_send in ip_fragment */ | |
755 | skb->local_df = 1; | |
756 | ||
fc604767 | 757 | IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local); |
b3cdd2a7 JV |
758 | |
759 | LeaveFunction(10); | |
760 | return NF_STOLEN; | |
761 | ||
762 | tx_error_icmp: | |
763 | dst_link_failure(skb); | |
764 | tx_error: | |
765 | LeaveFunction(10); | |
766 | kfree_skb(skb); | |
767 | return NF_STOLEN; | |
768 | tx_error_put: | |
d8d1f30b | 769 | dst_release(&rt->dst); |
b3cdd2a7 JV |
770 | goto tx_error; |
771 | } | |
772 | #endif | |
773 | ||
1da177e4 LT |
774 | |
775 | /* | |
776 | * IP Tunneling transmitter | |
777 | * | |
778 | * This function encapsulates the packet in a new IP packet, its | |
779 | * destination will be set to cp->daddr. Most code of this function | |
780 | * is taken from ipip.c. | |
781 | * | |
782 | * It is used in VS/TUN cluster. The load balancer selects a real | |
783 | * server from a cluster based on a scheduling algorithm, | |
784 | * encapsulates the request packet and forwards it to the selected | |
785 | * server. For example, all real servers are configured with | |
786 | * "ifconfig tunl0 <Virtual IP Address> up". When the server receives | |
787 | * the encapsulated packet, it will decapsulate the packet, processe | |
788 | * the request and return the response packets directly to the client | |
789 | * without passing the load balancer. This can greatly increase the | |
790 | * scalability of virtual server. | |
791 | * | |
792 | * Used for ANY protocol | |
793 | */ | |
794 | int | |
795 | ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
796 | struct ip_vs_protocol *pp) | |
797 | { | |
3654e611 | 798 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
1da177e4 | 799 | struct rtable *rt; /* Route to the other host */ |
c92f5ca2 | 800 | __be32 saddr; /* Source for tunnel */ |
1da177e4 | 801 | struct net_device *tdev; /* Device to other host */ |
eddc9ec5 | 802 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 | 803 | u8 tos = old_iph->tos; |
f2edb9f7 | 804 | __be16 df; |
1da177e4 | 805 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 806 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 807 | int mtu; |
f4bc17cd | 808 | int ret; |
1da177e4 LT |
809 | |
810 | EnterFunction(10); | |
811 | ||
fc604767 | 812 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 | 813 | RT_TOS(tos), IP_VS_RT_MODE_LOCAL | |
f2edb9f7 JA |
814 | IP_VS_RT_MODE_NON_LOCAL | |
815 | IP_VS_RT_MODE_CONNECT, | |
c92f5ca2 | 816 | &saddr))) |
1da177e4 | 817 | goto tx_error_icmp; |
fc604767 JA |
818 | if (rt->rt_flags & RTCF_LOCAL) { |
819 | ip_rt_put(rt); | |
820 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); | |
821 | } | |
1da177e4 | 822 | |
d8d1f30b | 823 | tdev = rt->dst.dev; |
1da177e4 | 824 | |
d8d1f30b | 825 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 826 | if (mtu < 68) { |
1e3e238e | 827 | IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__); |
fc604767 | 828 | goto tx_error_put; |
1da177e4 | 829 | } |
f2edb9f7 | 830 | if (rt_is_output_route(skb_rtable(skb))) |
6700c270 | 831 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
1da177e4 | 832 | |
f2edb9f7 | 833 | /* Copy DF, reset fragment offset and MF */ |
3654e611 | 834 | df = sysctl_pmtu_disc(ipvs) ? old_iph->frag_off & htons(IP_DF) : 0; |
1da177e4 | 835 | |
3654e611 | 836 | if (df && mtu < ntohs(old_iph->tot_len) && !skb_is_gso(skb)) { |
1da177e4 | 837 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
1e3e238e | 838 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 839 | goto tx_error_put; |
1da177e4 LT |
840 | } |
841 | ||
842 | /* | |
843 | * Okay, now see if we can stuff it in the buffer as-is. | |
844 | */ | |
845 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr); | |
846 | ||
847 | if (skb_headroom(skb) < max_headroom | |
848 | || skb_cloned(skb) || skb_shared(skb)) { | |
849 | struct sk_buff *new_skb = | |
850 | skb_realloc_headroom(skb, max_headroom); | |
851 | if (!new_skb) { | |
852 | ip_rt_put(rt); | |
853 | kfree_skb(skb); | |
1e3e238e | 854 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
1da177e4 LT |
855 | return NF_STOLEN; |
856 | } | |
5d0ba55b | 857 | consume_skb(skb); |
1da177e4 | 858 | skb = new_skb; |
eddc9ec5 | 859 | old_iph = ip_hdr(skb); |
1da177e4 LT |
860 | } |
861 | ||
714f095f | 862 | skb->transport_header = skb->network_header; |
1da177e4 LT |
863 | |
864 | /* fix old IP header checksum */ | |
865 | ip_send_check(old_iph); | |
866 | ||
e2d1bca7 ACM |
867 | skb_push(skb, sizeof(struct iphdr)); |
868 | skb_reset_network_header(skb); | |
1da177e4 LT |
869 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
870 | ||
871 | /* drop old route */ | |
adf30907 | 872 | skb_dst_drop(skb); |
d8d1f30b | 873 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
874 | |
875 | /* | |
876 | * Push down and install the IPIP header. | |
877 | */ | |
eddc9ec5 | 878 | iph = ip_hdr(skb); |
1da177e4 LT |
879 | iph->version = 4; |
880 | iph->ihl = sizeof(struct iphdr)>>2; | |
881 | iph->frag_off = df; | |
882 | iph->protocol = IPPROTO_IPIP; | |
883 | iph->tos = tos; | |
c92f5ca2 JA |
884 | iph->daddr = cp->daddr.ip; |
885 | iph->saddr = saddr; | |
1da177e4 | 886 | iph->ttl = old_iph->ttl; |
d8d1f30b | 887 | ip_select_ident(iph, &rt->dst, NULL); |
1da177e4 LT |
888 | |
889 | /* Another hack: avoid icmp_send in ip_fragment */ | |
890 | skb->local_df = 1; | |
891 | ||
f4bc17cd JA |
892 | ret = IP_VS_XMIT_TUNNEL(skb, cp); |
893 | if (ret == NF_ACCEPT) | |
894 | ip_local_out(skb); | |
895 | else if (ret == NF_DROP) | |
896 | kfree_skb(skb); | |
1da177e4 LT |
897 | |
898 | LeaveFunction(10); | |
899 | ||
900 | return NF_STOLEN; | |
901 | ||
902 | tx_error_icmp: | |
903 | dst_link_failure(skb); | |
904 | tx_error: | |
905 | kfree_skb(skb); | |
906 | LeaveFunction(10); | |
907 | return NF_STOLEN; | |
fc604767 JA |
908 | tx_error_put: |
909 | ip_rt_put(rt); | |
910 | goto tx_error; | |
1da177e4 LT |
911 | } |
912 | ||
b3cdd2a7 JV |
913 | #ifdef CONFIG_IP_VS_IPV6 |
914 | int | |
915 | ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
916 | struct ip_vs_protocol *pp) | |
917 | { | |
918 | struct rt6_info *rt; /* Route to the other host */ | |
714f095f | 919 | struct in6_addr saddr; /* Source for tunnel */ |
b3cdd2a7 JV |
920 | struct net_device *tdev; /* Device to other host */ |
921 | struct ipv6hdr *old_iph = ipv6_hdr(skb); | |
b3cdd2a7 JV |
922 | struct ipv6hdr *iph; /* Our new IP header */ |
923 | unsigned int max_headroom; /* The extra header space needed */ | |
924 | int mtu; | |
f4bc17cd | 925 | int ret; |
b3cdd2a7 JV |
926 | |
927 | EnterFunction(10); | |
928 | ||
fc604767 | 929 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, |
e58b3442 DM |
930 | &saddr, 1, (IP_VS_RT_MODE_LOCAL | |
931 | IP_VS_RT_MODE_NON_LOCAL)))) | |
b3cdd2a7 | 932 | goto tx_error_icmp; |
fc604767 JA |
933 | if (__ip_vs_is_local_route6(rt)) { |
934 | dst_release(&rt->dst); | |
935 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1); | |
936 | } | |
b3cdd2a7 | 937 | |
d8d1f30b | 938 | tdev = rt->dst.dev; |
b3cdd2a7 | 939 | |
d8d1f30b | 940 | mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr); |
714f095f | 941 | if (mtu < IPV6_MIN_MTU) { |
714f095f HS |
942 | IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__, |
943 | IPV6_MIN_MTU); | |
fc604767 | 944 | goto tx_error_put; |
b3cdd2a7 | 945 | } |
adf30907 | 946 | if (skb_dst(skb)) |
6700c270 | 947 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
b3cdd2a7 | 948 | |
8f1b03a4 SH |
949 | if (mtu < ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr) && |
950 | !skb_is_gso(skb)) { | |
cb59155f JA |
951 | if (!skb->dev) { |
952 | struct net *net = dev_net(skb_dst(skb)->dev); | |
953 | ||
954 | skb->dev = net->loopback_dev; | |
955 | } | |
3ffe533c | 956 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1e3e238e | 957 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 958 | goto tx_error_put; |
b3cdd2a7 JV |
959 | } |
960 | ||
961 | /* | |
962 | * Okay, now see if we can stuff it in the buffer as-is. | |
963 | */ | |
964 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr); | |
965 | ||
966 | if (skb_headroom(skb) < max_headroom | |
967 | || skb_cloned(skb) || skb_shared(skb)) { | |
968 | struct sk_buff *new_skb = | |
969 | skb_realloc_headroom(skb, max_headroom); | |
970 | if (!new_skb) { | |
d8d1f30b | 971 | dst_release(&rt->dst); |
b3cdd2a7 | 972 | kfree_skb(skb); |
1e3e238e | 973 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
b3cdd2a7 JV |
974 | return NF_STOLEN; |
975 | } | |
5d0ba55b | 976 | consume_skb(skb); |
b3cdd2a7 JV |
977 | skb = new_skb; |
978 | old_iph = ipv6_hdr(skb); | |
979 | } | |
980 | ||
714f095f | 981 | skb->transport_header = skb->network_header; |
b3cdd2a7 JV |
982 | |
983 | skb_push(skb, sizeof(struct ipv6hdr)); | |
984 | skb_reset_network_header(skb); | |
985 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
986 | ||
987 | /* drop old route */ | |
adf30907 | 988 | skb_dst_drop(skb); |
d8d1f30b | 989 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
990 | |
991 | /* | |
992 | * Push down and install the IPIP header. | |
993 | */ | |
994 | iph = ipv6_hdr(skb); | |
995 | iph->version = 6; | |
996 | iph->nexthdr = IPPROTO_IPV6; | |
b7b45f47 HH |
997 | iph->payload_len = old_iph->payload_len; |
998 | be16_add_cpu(&iph->payload_len, sizeof(*old_iph)); | |
b3cdd2a7 JV |
999 | iph->priority = old_iph->priority; |
1000 | memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl)); | |
4e3fd7a0 AD |
1001 | iph->daddr = cp->daddr.in6; |
1002 | iph->saddr = saddr; | |
b3cdd2a7 JV |
1003 | iph->hop_limit = old_iph->hop_limit; |
1004 | ||
1005 | /* Another hack: avoid icmp_send in ip_fragment */ | |
1006 | skb->local_df = 1; | |
1007 | ||
f4bc17cd JA |
1008 | ret = IP_VS_XMIT_TUNNEL(skb, cp); |
1009 | if (ret == NF_ACCEPT) | |
1010 | ip6_local_out(skb); | |
1011 | else if (ret == NF_DROP) | |
1012 | kfree_skb(skb); | |
b3cdd2a7 JV |
1013 | |
1014 | LeaveFunction(10); | |
1015 | ||
1016 | return NF_STOLEN; | |
1017 | ||
1018 | tx_error_icmp: | |
1019 | dst_link_failure(skb); | |
1020 | tx_error: | |
1021 | kfree_skb(skb); | |
1022 | LeaveFunction(10); | |
1023 | return NF_STOLEN; | |
fc604767 JA |
1024 | tx_error_put: |
1025 | dst_release(&rt->dst); | |
1026 | goto tx_error; | |
b3cdd2a7 JV |
1027 | } |
1028 | #endif | |
1029 | ||
1da177e4 LT |
1030 | |
1031 | /* | |
1032 | * Direct Routing transmitter | |
1033 | * Used for ANY protocol | |
1034 | */ | |
1035 | int | |
1036 | ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
1037 | struct ip_vs_protocol *pp) | |
1038 | { | |
1039 | struct rtable *rt; /* Route to the other host */ | |
eddc9ec5 | 1040 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1041 | int mtu; |
1042 | ||
1043 | EnterFunction(10); | |
1044 | ||
fc604767 | 1045 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 CG |
1046 | RT_TOS(iph->tos), |
1047 | IP_VS_RT_MODE_LOCAL | | |
c92f5ca2 | 1048 | IP_VS_RT_MODE_NON_LOCAL, NULL))) |
1da177e4 | 1049 | goto tx_error_icmp; |
fc604767 JA |
1050 | if (rt->rt_flags & RTCF_LOCAL) { |
1051 | ip_rt_put(rt); | |
1052 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); | |
1053 | } | |
1da177e4 LT |
1054 | |
1055 | /* MTU checking */ | |
d8d1f30b | 1056 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
1057 | if ((iph->frag_off & htons(IP_DF)) && skb->len > mtu && |
1058 | !skb_is_gso(skb)) { | |
1da177e4 LT |
1059 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
1060 | ip_rt_put(rt); | |
1e3e238e | 1061 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
1da177e4 LT |
1062 | goto tx_error; |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * Call ip_send_check because we are not sure it is called | |
1067 | * after ip_defrag. Is copy-on-write needed? | |
1068 | */ | |
1069 | if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) { | |
1070 | ip_rt_put(rt); | |
1071 | return NF_STOLEN; | |
1072 | } | |
eddc9ec5 | 1073 | ip_send_check(ip_hdr(skb)); |
1da177e4 LT |
1074 | |
1075 | /* drop old route */ | |
adf30907 | 1076 | skb_dst_drop(skb); |
d8d1f30b | 1077 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1078 | |
1079 | /* Another hack: avoid icmp_send in ip_fragment */ | |
1080 | skb->local_df = 1; | |
1081 | ||
fc604767 | 1082 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0); |
1da177e4 LT |
1083 | |
1084 | LeaveFunction(10); | |
1085 | return NF_STOLEN; | |
1086 | ||
1087 | tx_error_icmp: | |
1088 | dst_link_failure(skb); | |
1089 | tx_error: | |
1090 | kfree_skb(skb); | |
1091 | LeaveFunction(10); | |
1092 | return NF_STOLEN; | |
1093 | } | |
1094 | ||
b3cdd2a7 JV |
1095 | #ifdef CONFIG_IP_VS_IPV6 |
1096 | int | |
1097 | ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
1098 | struct ip_vs_protocol *pp) | |
1099 | { | |
1100 | struct rt6_info *rt; /* Route to the other host */ | |
1101 | int mtu; | |
1102 | ||
1103 | EnterFunction(10); | |
1104 | ||
fc604767 | 1105 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
e58b3442 DM |
1106 | 0, (IP_VS_RT_MODE_LOCAL | |
1107 | IP_VS_RT_MODE_NON_LOCAL)))) | |
b3cdd2a7 | 1108 | goto tx_error_icmp; |
fc604767 JA |
1109 | if (__ip_vs_is_local_route6(rt)) { |
1110 | dst_release(&rt->dst); | |
1111 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1); | |
1112 | } | |
b3cdd2a7 JV |
1113 | |
1114 | /* MTU checking */ | |
d8d1f30b | 1115 | mtu = dst_mtu(&rt->dst); |
b3cdd2a7 | 1116 | if (skb->len > mtu) { |
cb59155f JA |
1117 | if (!skb->dev) { |
1118 | struct net *net = dev_net(skb_dst(skb)->dev); | |
1119 | ||
1120 | skb->dev = net->loopback_dev; | |
1121 | } | |
3ffe533c | 1122 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
d8d1f30b | 1123 | dst_release(&rt->dst); |
1e3e238e | 1124 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
b3cdd2a7 JV |
1125 | goto tx_error; |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Call ip_send_check because we are not sure it is called | |
1130 | * after ip_defrag. Is copy-on-write needed? | |
1131 | */ | |
1132 | skb = skb_share_check(skb, GFP_ATOMIC); | |
1133 | if (unlikely(skb == NULL)) { | |
d8d1f30b | 1134 | dst_release(&rt->dst); |
b3cdd2a7 JV |
1135 | return NF_STOLEN; |
1136 | } | |
1137 | ||
1138 | /* drop old route */ | |
adf30907 | 1139 | skb_dst_drop(skb); |
d8d1f30b | 1140 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
1141 | |
1142 | /* Another hack: avoid icmp_send in ip_fragment */ | |
1143 | skb->local_df = 1; | |
1144 | ||
fc604767 | 1145 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0); |
b3cdd2a7 JV |
1146 | |
1147 | LeaveFunction(10); | |
1148 | return NF_STOLEN; | |
1149 | ||
1150 | tx_error_icmp: | |
1151 | dst_link_failure(skb); | |
1152 | tx_error: | |
1153 | kfree_skb(skb); | |
1154 | LeaveFunction(10); | |
1155 | return NF_STOLEN; | |
1156 | } | |
1157 | #endif | |
1158 | ||
1da177e4 LT |
1159 | |
1160 | /* | |
1161 | * ICMP packet transmitter | |
1162 | * called by the ip_vs_in_icmp | |
1163 | */ | |
1164 | int | |
1165 | ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
c92f5ca2 | 1166 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum) |
1da177e4 LT |
1167 | { |
1168 | struct rtable *rt; /* Route to the other host */ | |
1169 | int mtu; | |
1170 | int rc; | |
fc604767 | 1171 | int local; |
c92f5ca2 | 1172 | int rt_mode; |
1da177e4 LT |
1173 | |
1174 | EnterFunction(10); | |
1175 | ||
1176 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be | |
1177 | forwarded directly here, because there is no need to | |
1178 | translate address/port back */ | |
1179 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { | |
1180 | if (cp->packet_xmit) | |
1181 | rc = cp->packet_xmit(skb, cp, pp); | |
1182 | else | |
1183 | rc = NF_ACCEPT; | |
1184 | /* do not touch skb anymore */ | |
1185 | atomic_inc(&cp->in_pkts); | |
1da177e4 LT |
1186 | goto out; |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * mangle and send the packet here (only for VS/NAT) | |
1191 | */ | |
1192 | ||
c92f5ca2 JA |
1193 | /* LOCALNODE from FORWARD hook is not supported */ |
1194 | rt_mode = (hooknum != NF_INET_FORWARD) ? | |
1195 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | | |
1196 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; | |
fc604767 | 1197 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 | 1198 | RT_TOS(ip_hdr(skb)->tos), |
c92f5ca2 | 1199 | rt_mode, NULL))) |
1da177e4 | 1200 | goto tx_error_icmp; |
fc604767 JA |
1201 | local = rt->rt_flags & RTCF_LOCAL; |
1202 | ||
1203 | /* | |
1204 | * Avoid duplicate tuple in reply direction for NAT traffic | |
1205 | * to local address when connection is sync-ed | |
1206 | */ | |
c0cd1156 | 1207 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
1208 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
1209 | enum ip_conntrack_info ctinfo; | |
1210 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
1211 | ||
1212 | if (ct && !nf_ct_is_untracked(ct)) { | |
1213 | IP_VS_DBG(10, "%s(): " | |
1214 | "stopping DNAT to local address %pI4\n", | |
1215 | __func__, &cp->daddr.ip); | |
1216 | goto tx_error_put; | |
1217 | } | |
1218 | } | |
1219 | #endif | |
1220 | ||
1221 | /* From world but DNAT to loopback address? */ | |
c92f5ca2 | 1222 | if (local && ipv4_is_loopback(cp->daddr.ip) && |
c7537967 | 1223 | rt_is_input_route(skb_rtable(skb))) { |
fc604767 JA |
1224 | IP_VS_DBG(1, "%s(): " |
1225 | "stopping DNAT to loopback %pI4\n", | |
1226 | __func__, &cp->daddr.ip); | |
1227 | goto tx_error_put; | |
1228 | } | |
1da177e4 LT |
1229 | |
1230 | /* MTU checking */ | |
d8d1f30b | 1231 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
1232 | if ((skb->len > mtu) && (ip_hdr(skb)->frag_off & htons(IP_DF)) && |
1233 | !skb_is_gso(skb)) { | |
1da177e4 | 1234 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
1e3e238e | 1235 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 1236 | goto tx_error_put; |
1da177e4 LT |
1237 | } |
1238 | ||
1239 | /* copy-on-write the packet before mangling it */ | |
af1e1cf0 | 1240 | if (!skb_make_writable(skb, offset)) |
1da177e4 LT |
1241 | goto tx_error_put; |
1242 | ||
d8d1f30b | 1243 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
1da177e4 LT |
1244 | goto tx_error_put; |
1245 | ||
1da177e4 LT |
1246 | ip_vs_nat_icmp(skb, pp, cp, 0); |
1247 | ||
fc604767 JA |
1248 | if (!local) { |
1249 | /* drop the old route when skb is not shared */ | |
1250 | skb_dst_drop(skb); | |
1251 | skb_dst_set(skb, &rt->dst); | |
1252 | } else { | |
1253 | ip_rt_put(rt); | |
1254 | /* | |
1255 | * Some IPv4 replies get local address from routes, | |
1256 | * not from iph, so while we DNAT after routing | |
1257 | * we need this second input/output route. | |
1258 | */ | |
1259 | if (!__ip_vs_reroute_locally(skb)) | |
1260 | goto tx_error; | |
1261 | } | |
1262 | ||
1da177e4 LT |
1263 | /* Another hack: avoid icmp_send in ip_fragment */ |
1264 | skb->local_df = 1; | |
1265 | ||
fc604767 | 1266 | IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local); |
1da177e4 LT |
1267 | |
1268 | rc = NF_STOLEN; | |
1269 | goto out; | |
1270 | ||
1271 | tx_error_icmp: | |
1272 | dst_link_failure(skb); | |
1273 | tx_error: | |
1274 | dev_kfree_skb(skb); | |
1275 | rc = NF_STOLEN; | |
1276 | out: | |
1277 | LeaveFunction(10); | |
1278 | return rc; | |
1279 | tx_error_put: | |
1280 | ip_rt_put(rt); | |
1281 | goto tx_error; | |
1282 | } | |
b3cdd2a7 JV |
1283 | |
1284 | #ifdef CONFIG_IP_VS_IPV6 | |
1285 | int | |
1286 | ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
c92f5ca2 | 1287 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum) |
b3cdd2a7 JV |
1288 | { |
1289 | struct rt6_info *rt; /* Route to the other host */ | |
1290 | int mtu; | |
1291 | int rc; | |
fc604767 | 1292 | int local; |
c92f5ca2 | 1293 | int rt_mode; |
b3cdd2a7 JV |
1294 | |
1295 | EnterFunction(10); | |
1296 | ||
1297 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be | |
1298 | forwarded directly here, because there is no need to | |
1299 | translate address/port back */ | |
1300 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { | |
1301 | if (cp->packet_xmit) | |
1302 | rc = cp->packet_xmit(skb, cp, pp); | |
1303 | else | |
1304 | rc = NF_ACCEPT; | |
1305 | /* do not touch skb anymore */ | |
1306 | atomic_inc(&cp->in_pkts); | |
1307 | goto out; | |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * mangle and send the packet here (only for VS/NAT) | |
1312 | */ | |
1313 | ||
c92f5ca2 JA |
1314 | /* LOCALNODE from FORWARD hook is not supported */ |
1315 | rt_mode = (hooknum != NF_INET_FORWARD) ? | |
1316 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | | |
1317 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; | |
fc604767 | 1318 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
c92f5ca2 | 1319 | 0, rt_mode))) |
b3cdd2a7 JV |
1320 | goto tx_error_icmp; |
1321 | ||
fc604767 JA |
1322 | local = __ip_vs_is_local_route6(rt); |
1323 | /* | |
1324 | * Avoid duplicate tuple in reply direction for NAT traffic | |
1325 | * to local address when connection is sync-ed | |
1326 | */ | |
c0cd1156 | 1327 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
1328 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
1329 | enum ip_conntrack_info ctinfo; | |
1330 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
1331 | ||
1332 | if (ct && !nf_ct_is_untracked(ct)) { | |
1333 | IP_VS_DBG(10, "%s(): " | |
1334 | "stopping DNAT to local address %pI6\n", | |
1335 | __func__, &cp->daddr.in6); | |
1336 | goto tx_error_put; | |
1337 | } | |
1338 | } | |
1339 | #endif | |
1340 | ||
1341 | /* From world but DNAT to loopback address? */ | |
1342 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && | |
1343 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { | |
1344 | IP_VS_DBG(1, "%s(): " | |
1345 | "stopping DNAT to loopback %pI6\n", | |
1346 | __func__, &cp->daddr.in6); | |
1347 | goto tx_error_put; | |
1348 | } | |
1349 | ||
b3cdd2a7 | 1350 | /* MTU checking */ |
d8d1f30b | 1351 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 1352 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
1353 | if (!skb->dev) { |
1354 | struct net *net = dev_net(skb_dst(skb)->dev); | |
1355 | ||
1356 | skb->dev = net->loopback_dev; | |
1357 | } | |
3ffe533c | 1358 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1e3e238e | 1359 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 1360 | goto tx_error_put; |
b3cdd2a7 JV |
1361 | } |
1362 | ||
1363 | /* copy-on-write the packet before mangling it */ | |
1364 | if (!skb_make_writable(skb, offset)) | |
1365 | goto tx_error_put; | |
1366 | ||
d8d1f30b | 1367 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
b3cdd2a7 JV |
1368 | goto tx_error_put; |
1369 | ||
b3cdd2a7 JV |
1370 | ip_vs_nat_icmp_v6(skb, pp, cp, 0); |
1371 | ||
fc604767 JA |
1372 | if (!local || !skb->dev) { |
1373 | /* drop the old route when skb is not shared */ | |
1374 | skb_dst_drop(skb); | |
1375 | skb_dst_set(skb, &rt->dst); | |
1376 | } else { | |
1377 | /* destined to loopback, do we need to change route? */ | |
1378 | dst_release(&rt->dst); | |
1379 | } | |
1380 | ||
b3cdd2a7 JV |
1381 | /* Another hack: avoid icmp_send in ip_fragment */ |
1382 | skb->local_df = 1; | |
1383 | ||
fc604767 | 1384 | IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local); |
b3cdd2a7 JV |
1385 | |
1386 | rc = NF_STOLEN; | |
1387 | goto out; | |
1388 | ||
1389 | tx_error_icmp: | |
1390 | dst_link_failure(skb); | |
1391 | tx_error: | |
1392 | dev_kfree_skb(skb); | |
1393 | rc = NF_STOLEN; | |
1394 | out: | |
1395 | LeaveFunction(10); | |
1396 | return rc; | |
1397 | tx_error_put: | |
d8d1f30b | 1398 | dst_release(&rt->dst); |
b3cdd2a7 JV |
1399 | goto tx_error; |
1400 | } | |
1401 | #endif |