]>
Commit | Line | Data |
---|---|---|
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 | |
026ace06 JA |
20 | * - we can use dst without ref while sending in RCU section, we use |
21 | * ref when returning NF_ACCEPT for NAT-ed packet via loopback | |
cb59155f JA |
22 | * LOCAL_OUT rules: |
23 | * - skb->dev is NULL, skb->protocol is not set (both are set in POST_ROUTING) | |
24 | * - skb->pkt_type is not set yet | |
25 | * - the only place where we can see skb->sk != NULL | |
1da177e4 LT |
26 | */ |
27 | ||
9aada7ac HE |
28 | #define KMSG_COMPONENT "IPVS" |
29 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
30 | ||
1da177e4 | 31 | #include <linux/kernel.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 | 33 | #include <linux/tcp.h> /* for tcphdr */ |
c439cb2e | 34 | #include <net/ip.h> |
1da177e4 LT |
35 | #include <net/tcp.h> /* for csum_tcpudp_magic */ |
36 | #include <net/udp.h> | |
37 | #include <net/icmp.h> /* for icmp_send */ | |
38 | #include <net/route.h> /* for ip_route_output */ | |
38cdcc9a JV |
39 | #include <net/ipv6.h> |
40 | #include <net/ip6_route.h> | |
ea1d5d77 | 41 | #include <net/ip_tunnels.h> |
714f095f | 42 | #include <net/addrconf.h> |
38cdcc9a | 43 | #include <linux/icmpv6.h> |
1da177e4 LT |
44 | #include <linux/netfilter.h> |
45 | #include <linux/netfilter_ipv4.h> | |
46 | ||
47 | #include <net/ip_vs.h> | |
48 | ||
17a8f8e3 CG |
49 | enum { |
50 | IP_VS_RT_MODE_LOCAL = 1, /* Allow local dest */ | |
51 | IP_VS_RT_MODE_NON_LOCAL = 2, /* Allow non-local dest */ | |
52 | IP_VS_RT_MODE_RDR = 4, /* Allow redirect from remote daddr to | |
53 | * local | |
54 | */ | |
f2edb9f7 | 55 | IP_VS_RT_MODE_CONNECT = 8, /* Always bind route to saddr */ |
ad4d3ef8 | 56 | IP_VS_RT_MODE_KNOWN_NH = 16,/* Route via remote addr */ |
4115ded1 | 57 | IP_VS_RT_MODE_TUNNEL = 32,/* Tunnel mode */ |
17a8f8e3 | 58 | }; |
1da177e4 | 59 | |
026ace06 JA |
60 | static inline struct ip_vs_dest_dst *ip_vs_dest_dst_alloc(void) |
61 | { | |
62 | return kmalloc(sizeof(struct ip_vs_dest_dst), GFP_ATOMIC); | |
63 | } | |
64 | ||
65 | static inline void ip_vs_dest_dst_free(struct ip_vs_dest_dst *dest_dst) | |
66 | { | |
67 | kfree(dest_dst); | |
68 | } | |
69 | ||
1da177e4 LT |
70 | /* |
71 | * Destination cache to speed up outgoing route lookup | |
72 | */ | |
73 | static inline void | |
026ace06 JA |
74 | __ip_vs_dst_set(struct ip_vs_dest *dest, struct ip_vs_dest_dst *dest_dst, |
75 | struct dst_entry *dst, u32 dst_cookie) | |
1da177e4 | 76 | { |
026ace06 JA |
77 | struct ip_vs_dest_dst *old; |
78 | ||
79 | old = rcu_dereference_protected(dest->dest_dst, | |
80 | lockdep_is_held(&dest->dst_lock)); | |
81 | ||
82 | if (dest_dst) { | |
83 | dest_dst->dst_cache = dst; | |
84 | dest_dst->dst_cookie = dst_cookie; | |
85 | } | |
86 | rcu_assign_pointer(dest->dest_dst, dest_dst); | |
1da177e4 | 87 | |
026ace06 JA |
88 | if (old) |
89 | call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free); | |
1da177e4 LT |
90 | } |
91 | ||
026ace06 | 92 | static inline struct ip_vs_dest_dst * |
c90558da | 93 | __ip_vs_dst_check(struct ip_vs_dest *dest) |
1da177e4 | 94 | { |
026ace06 JA |
95 | struct ip_vs_dest_dst *dest_dst = rcu_dereference(dest->dest_dst); |
96 | struct dst_entry *dst; | |
1da177e4 | 97 | |
026ace06 | 98 | if (!dest_dst) |
1da177e4 | 99 | return NULL; |
026ace06 JA |
100 | dst = dest_dst->dst_cache; |
101 | if (dst->obsolete && | |
102 | dst->ops->check(dst, dest_dst->dst_cookie) == NULL) | |
1da177e4 | 103 | return NULL; |
026ace06 | 104 | return dest_dst; |
1da177e4 LT |
105 | } |
106 | ||
590e3f79 JDB |
107 | static inline bool |
108 | __mtu_check_toobig_v6(const struct sk_buff *skb, u32 mtu) | |
109 | { | |
4cdd3408 PM |
110 | if (IP6CB(skb)->frag_max_size) { |
111 | /* frag_max_size tell us that, this packet have been | |
112 | * defragmented by netfilter IPv6 conntrack module. | |
113 | */ | |
114 | if (IP6CB(skb)->frag_max_size > mtu) | |
115 | return true; /* largest fragment violate MTU */ | |
116 | } | |
117 | else if (skb->len > mtu && !skb_is_gso(skb)) { | |
590e3f79 JDB |
118 | return true; /* Packet size violate MTU size */ |
119 | } | |
120 | return false; | |
121 | } | |
122 | ||
f2edb9f7 JA |
123 | /* Get route to daddr, update *saddr, optionally bind route to saddr */ |
124 | static struct rtable *do_output_route4(struct net *net, __be32 daddr, | |
c90558da | 125 | int rt_mode, __be32 *saddr) |
f2edb9f7 JA |
126 | { |
127 | struct flowi4 fl4; | |
128 | struct rtable *rt; | |
129 | int loop = 0; | |
130 | ||
131 | memset(&fl4, 0, sizeof(fl4)); | |
132 | fl4.daddr = daddr; | |
ad4d3ef8 JA |
133 | fl4.flowi4_flags = (rt_mode & IP_VS_RT_MODE_KNOWN_NH) ? |
134 | FLOWI_FLAG_KNOWN_NH : 0; | |
f2edb9f7 JA |
135 | |
136 | retry: | |
137 | rt = ip_route_output_key(net, &fl4); | |
138 | if (IS_ERR(rt)) { | |
139 | /* Invalid saddr ? */ | |
140 | if (PTR_ERR(rt) == -EINVAL && *saddr && | |
141 | rt_mode & IP_VS_RT_MODE_CONNECT && !loop) { | |
142 | *saddr = 0; | |
c90558da | 143 | flowi4_update_output(&fl4, 0, 0, daddr, 0); |
f2edb9f7 JA |
144 | goto retry; |
145 | } | |
146 | IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", &daddr); | |
147 | return NULL; | |
148 | } else if (!*saddr && rt_mode & IP_VS_RT_MODE_CONNECT && fl4.saddr) { | |
149 | ip_rt_put(rt); | |
150 | *saddr = fl4.saddr; | |
c90558da | 151 | flowi4_update_output(&fl4, 0, 0, daddr, fl4.saddr); |
f2edb9f7 JA |
152 | loop++; |
153 | goto retry; | |
154 | } | |
155 | *saddr = fl4.saddr; | |
156 | return rt; | |
157 | } | |
158 | ||
4a4739d5 AG |
159 | #ifdef CONFIG_IP_VS_IPV6 |
160 | static inline int __ip_vs_is_local_route6(struct rt6_info *rt) | |
161 | { | |
162 | return rt->dst.dev && rt->dst.dev->flags & IFF_LOOPBACK; | |
163 | } | |
164 | #endif | |
165 | ||
166 | static inline bool crosses_local_route_boundary(int skb_af, struct sk_buff *skb, | |
167 | int rt_mode, | |
168 | bool new_rt_is_local) | |
169 | { | |
170 | bool rt_mode_allow_local = !!(rt_mode & IP_VS_RT_MODE_LOCAL); | |
171 | bool rt_mode_allow_non_local = !!(rt_mode & IP_VS_RT_MODE_LOCAL); | |
172 | bool rt_mode_allow_redirect = !!(rt_mode & IP_VS_RT_MODE_RDR); | |
173 | bool source_is_loopback; | |
174 | bool old_rt_is_local; | |
175 | ||
176 | #ifdef CONFIG_IP_VS_IPV6 | |
177 | if (skb_af == AF_INET6) { | |
178 | int addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); | |
179 | ||
180 | source_is_loopback = | |
181 | (!skb->dev || skb->dev->flags & IFF_LOOPBACK) && | |
182 | (addr_type & IPV6_ADDR_LOOPBACK); | |
183 | old_rt_is_local = __ip_vs_is_local_route6( | |
184 | (struct rt6_info *)skb_dst(skb)); | |
185 | } else | |
186 | #endif | |
187 | { | |
188 | source_is_loopback = ipv4_is_loopback(ip_hdr(skb)->saddr); | |
189 | old_rt_is_local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; | |
190 | } | |
191 | ||
192 | if (unlikely(new_rt_is_local)) { | |
193 | if (!rt_mode_allow_local) | |
194 | return true; | |
195 | if (!rt_mode_allow_redirect && !old_rt_is_local) | |
196 | return true; | |
197 | } else { | |
198 | if (!rt_mode_allow_non_local) | |
199 | return true; | |
200 | if (source_is_loopback) | |
201 | return true; | |
202 | } | |
203 | return false; | |
204 | } | |
205 | ||
919aa0b2 AG |
206 | static inline void maybe_update_pmtu(int skb_af, struct sk_buff *skb, int mtu) |
207 | { | |
208 | struct sock *sk = skb->sk; | |
209 | struct rtable *ort = skb_rtable(skb); | |
210 | ||
a8399231 | 211 | if (!skb->dev && sk && sk_fullsock(sk)) |
919aa0b2 AG |
212 | ort->dst.ops->update_pmtu(&ort->dst, sk, NULL, mtu); |
213 | } | |
214 | ||
c63e4de2 AG |
215 | static inline bool ensure_mtu_is_adequate(int skb_af, int rt_mode, |
216 | struct ip_vs_iphdr *ipvsh, | |
217 | struct sk_buff *skb, int mtu) | |
218 | { | |
219 | #ifdef CONFIG_IP_VS_IPV6 | |
220 | if (skb_af == AF_INET6) { | |
221 | struct net *net = dev_net(skb_dst(skb)->dev); | |
222 | ||
223 | if (unlikely(__mtu_check_toobig_v6(skb, mtu))) { | |
224 | if (!skb->dev) | |
225 | skb->dev = net->loopback_dev; | |
226 | /* only send ICMP too big on first fragment */ | |
227 | if (!ipvsh->fragoffs) | |
228 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
229 | IP_VS_DBG(1, "frag needed for %pI6c\n", | |
230 | &ipv6_hdr(skb)->saddr); | |
231 | return false; | |
232 | } | |
233 | } else | |
234 | #endif | |
235 | { | |
236 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); | |
237 | ||
238 | /* If we're going to tunnel the packet and pmtu discovery | |
239 | * is disabled, we'll just fragment it anyway | |
240 | */ | |
241 | if ((rt_mode & IP_VS_RT_MODE_TUNNEL) && !sysctl_pmtu_disc(ipvs)) | |
242 | return true; | |
243 | ||
244 | if (unlikely(ip_hdr(skb)->frag_off & htons(IP_DF) && | |
245 | skb->len > mtu && !skb_is_gso(skb))) { | |
246 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
247 | htonl(mtu)); | |
248 | IP_VS_DBG(1, "frag needed for %pI4\n", | |
249 | &ip_hdr(skb)->saddr); | |
250 | return false; | |
251 | } | |
252 | } | |
253 | ||
254 | return true; | |
255 | } | |
256 | ||
17a8f8e3 | 257 | /* Get route to destination or remote server */ |
4115ded1 | 258 | static int |
4a4739d5 | 259 | __ip_vs_get_out_rt(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest, |
c63e4de2 AG |
260 | __be32 daddr, int rt_mode, __be32 *ret_saddr, |
261 | struct ip_vs_iphdr *ipvsh) | |
1da177e4 | 262 | { |
fc604767 | 263 | struct net *net = dev_net(skb_dst(skb)->dev); |
026ace06 | 264 | struct ip_vs_dest_dst *dest_dst; |
1da177e4 | 265 | struct rtable *rt; /* Route to the other host */ |
4115ded1 | 266 | int mtu; |
026ace06 | 267 | int local, noref = 1; |
1da177e4 LT |
268 | |
269 | if (dest) { | |
026ace06 JA |
270 | dest_dst = __ip_vs_dst_check(dest); |
271 | if (likely(dest_dst)) | |
272 | rt = (struct rtable *) dest_dst->dst_cache; | |
273 | else { | |
274 | dest_dst = ip_vs_dest_dst_alloc(); | |
ac69269a | 275 | spin_lock_bh(&dest->dst_lock); |
026ace06 JA |
276 | if (!dest_dst) { |
277 | __ip_vs_dst_set(dest, NULL, NULL, 0); | |
ac69269a | 278 | spin_unlock_bh(&dest->dst_lock); |
026ace06 JA |
279 | goto err_unreach; |
280 | } | |
c90558da | 281 | rt = do_output_route4(net, dest->addr.ip, rt_mode, |
026ace06 | 282 | &dest_dst->dst_saddr.ip); |
f2edb9f7 | 283 | if (!rt) { |
026ace06 | 284 | __ip_vs_dst_set(dest, NULL, NULL, 0); |
ac69269a | 285 | spin_unlock_bh(&dest->dst_lock); |
026ace06 | 286 | ip_vs_dest_dst_free(dest_dst); |
4115ded1 | 287 | goto err_unreach; |
1da177e4 | 288 | } |
026ace06 | 289 | __ip_vs_dst_set(dest, dest_dst, &rt->dst, 0); |
ac69269a | 290 | spin_unlock_bh(&dest->dst_lock); |
c90558da | 291 | IP_VS_DBG(10, "new dst %pI4, src %pI4, refcnt=%d\n", |
026ace06 | 292 | &dest->addr.ip, &dest_dst->dst_saddr.ip, |
c90558da | 293 | atomic_read(&rt->dst.__refcnt)); |
1da177e4 | 294 | } |
c92f5ca2 | 295 | if (ret_saddr) |
026ace06 | 296 | *ret_saddr = dest_dst->dst_saddr.ip; |
1da177e4 | 297 | } else { |
f2edb9f7 | 298 | __be32 saddr = htonl(INADDR_ANY); |
c92f5ca2 | 299 | |
026ace06 JA |
300 | noref = 0; |
301 | ||
f2edb9f7 JA |
302 | /* For such unconfigured boxes avoid many route lookups |
303 | * for performance reasons because we do not remember saddr | |
304 | */ | |
305 | rt_mode &= ~IP_VS_RT_MODE_CONNECT; | |
c90558da | 306 | rt = do_output_route4(net, daddr, rt_mode, &saddr); |
f2edb9f7 | 307 | if (!rt) |
4115ded1 | 308 | goto err_unreach; |
c92f5ca2 | 309 | if (ret_saddr) |
f2edb9f7 | 310 | *ret_saddr = saddr; |
1da177e4 LT |
311 | } |
312 | ||
4115ded1 | 313 | local = (rt->rt_flags & RTCF_LOCAL) ? 1 : 0; |
4a4739d5 AG |
314 | if (unlikely(crosses_local_route_boundary(skb_af, skb, rt_mode, |
315 | local))) { | |
316 | IP_VS_DBG_RL("We are crossing local and non-local addresses" | |
3d53666b | 317 | " daddr=%pI4\n", &daddr); |
4115ded1 | 318 | goto err_put; |
fc604767 | 319 | } |
4a4739d5 AG |
320 | |
321 | if (unlikely(local)) { | |
4115ded1 | 322 | /* skb to local stack, preserve old route */ |
026ace06 JA |
323 | if (!noref) |
324 | ip_rt_put(rt); | |
4115ded1 | 325 | return local; |
fc604767 | 326 | } |
4115ded1 JA |
327 | |
328 | if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL))) { | |
329 | mtu = dst_mtu(&rt->dst); | |
4115ded1 | 330 | } else { |
4115ded1 JA |
331 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
332 | if (mtu < 68) { | |
333 | IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__); | |
334 | goto err_put; | |
335 | } | |
919aa0b2 | 336 | maybe_update_pmtu(skb_af, skb, mtu); |
fc604767 JA |
337 | } |
338 | ||
c63e4de2 | 339 | if (!ensure_mtu_is_adequate(skb_af, rt_mode, ipvsh, skb, mtu)) |
4115ded1 | 340 | goto err_put; |
4115ded1 JA |
341 | |
342 | skb_dst_drop(skb); | |
026ace06 JA |
343 | if (noref) { |
344 | if (!local) | |
dbfc4fb7 | 345 | skb_dst_set_noref(skb, &rt->dst); |
026ace06 JA |
346 | else |
347 | skb_dst_set(skb, dst_clone(&rt->dst)); | |
348 | } else | |
349 | skb_dst_set(skb, &rt->dst); | |
4115ded1 JA |
350 | |
351 | return local; | |
352 | ||
353 | err_put: | |
026ace06 JA |
354 | if (!noref) |
355 | ip_rt_put(rt); | |
4115ded1 JA |
356 | return -1; |
357 | ||
358 | err_unreach: | |
359 | dst_link_failure(skb); | |
360 | return -1; | |
1da177e4 LT |
361 | } |
362 | ||
38cdcc9a | 363 | #ifdef CONFIG_IP_VS_IPV6 |
714f095f HS |
364 | static struct dst_entry * |
365 | __ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr, | |
48e8aa6e | 366 | struct in6_addr *ret_saddr, int do_xfrm, int rt_mode) |
714f095f HS |
367 | { |
368 | struct dst_entry *dst; | |
4c9483b2 DM |
369 | struct flowi6 fl6 = { |
370 | .daddr = *daddr, | |
714f095f HS |
371 | }; |
372 | ||
48e8aa6e MKL |
373 | if (rt_mode & IP_VS_RT_MODE_KNOWN_NH) |
374 | fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH; | |
375 | ||
4c9483b2 | 376 | dst = ip6_route_output(net, NULL, &fl6); |
714f095f HS |
377 | if (dst->error) |
378 | goto out_err; | |
379 | if (!ret_saddr) | |
380 | return dst; | |
4c9483b2 | 381 | if (ipv6_addr_any(&fl6.saddr) && |
714f095f | 382 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, |
4c9483b2 | 383 | &fl6.daddr, 0, &fl6.saddr) < 0) |
714f095f | 384 | goto out_err; |
452edd59 | 385 | if (do_xfrm) { |
4c9483b2 | 386 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 DM |
387 | if (IS_ERR(dst)) { |
388 | dst = NULL; | |
389 | goto out_err; | |
390 | } | |
391 | } | |
4e3fd7a0 | 392 | *ret_saddr = fl6.saddr; |
714f095f HS |
393 | return dst; |
394 | ||
395 | out_err: | |
396 | dst_release(dst); | |
397 | IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr); | |
398 | return NULL; | |
399 | } | |
400 | ||
fc604767 JA |
401 | /* |
402 | * Get route to destination or remote server | |
fc604767 | 403 | */ |
4115ded1 | 404 | static int |
4a4739d5 | 405 | __ip_vs_get_out_rt_v6(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest, |
fc604767 | 406 | struct in6_addr *daddr, struct in6_addr *ret_saddr, |
4115ded1 | 407 | struct ip_vs_iphdr *ipvsh, int do_xfrm, int rt_mode) |
38cdcc9a | 408 | { |
fc604767 | 409 | struct net *net = dev_net(skb_dst(skb)->dev); |
026ace06 | 410 | struct ip_vs_dest_dst *dest_dst; |
38cdcc9a | 411 | struct rt6_info *rt; /* Route to the other host */ |
714f095f | 412 | struct dst_entry *dst; |
4115ded1 | 413 | int mtu; |
026ace06 | 414 | int local, noref = 1; |
38cdcc9a JV |
415 | |
416 | if (dest) { | |
026ace06 JA |
417 | dest_dst = __ip_vs_dst_check(dest); |
418 | if (likely(dest_dst)) | |
419 | rt = (struct rt6_info *) dest_dst->dst_cache; | |
420 | else { | |
714f095f | 421 | u32 cookie; |
38cdcc9a | 422 | |
026ace06 | 423 | dest_dst = ip_vs_dest_dst_alloc(); |
ac69269a | 424 | spin_lock_bh(&dest->dst_lock); |
026ace06 JA |
425 | if (!dest_dst) { |
426 | __ip_vs_dst_set(dest, NULL, NULL, 0); | |
ac69269a | 427 | spin_unlock_bh(&dest->dst_lock); |
026ace06 JA |
428 | goto err_unreach; |
429 | } | |
714f095f | 430 | dst = __ip_vs_route_output_v6(net, &dest->addr.in6, |
026ace06 | 431 | &dest_dst->dst_saddr.in6, |
48e8aa6e | 432 | do_xfrm, rt_mode); |
714f095f | 433 | if (!dst) { |
026ace06 | 434 | __ip_vs_dst_set(dest, NULL, NULL, 0); |
ac69269a | 435 | spin_unlock_bh(&dest->dst_lock); |
026ace06 | 436 | ip_vs_dest_dst_free(dest_dst); |
4115ded1 | 437 | goto err_unreach; |
38cdcc9a | 438 | } |
714f095f | 439 | rt = (struct rt6_info *) dst; |
b197df4f | 440 | cookie = rt6_get_cookie(rt); |
026ace06 | 441 | __ip_vs_dst_set(dest, dest_dst, &rt->dst, cookie); |
ac69269a | 442 | spin_unlock_bh(&dest->dst_lock); |
714f095f | 443 | IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n", |
026ace06 | 444 | &dest->addr.in6, &dest_dst->dst_saddr.in6, |
d8d1f30b | 445 | atomic_read(&rt->dst.__refcnt)); |
38cdcc9a | 446 | } |
714f095f | 447 | if (ret_saddr) |
026ace06 | 448 | *ret_saddr = dest_dst->dst_saddr.in6; |
38cdcc9a | 449 | } else { |
026ace06 | 450 | noref = 0; |
48e8aa6e MKL |
451 | dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm, |
452 | rt_mode); | |
714f095f | 453 | if (!dst) |
4115ded1 | 454 | goto err_unreach; |
714f095f | 455 | rt = (struct rt6_info *) dst; |
38cdcc9a JV |
456 | } |
457 | ||
fc604767 | 458 | local = __ip_vs_is_local_route6(rt); |
4a4739d5 AG |
459 | |
460 | if (unlikely(crosses_local_route_boundary(skb_af, skb, rt_mode, | |
461 | local))) { | |
462 | IP_VS_DBG_RL("We are crossing local and non-local addresses" | |
3d53666b | 463 | " daddr=%pI6\n", daddr); |
4115ded1 | 464 | goto err_put; |
fc604767 | 465 | } |
4a4739d5 AG |
466 | |
467 | if (unlikely(local)) { | |
4115ded1 | 468 | /* skb to local stack, preserve old route */ |
026ace06 JA |
469 | if (!noref) |
470 | dst_release(&rt->dst); | |
4115ded1 | 471 | return local; |
fc604767 | 472 | } |
4115ded1 JA |
473 | |
474 | /* MTU checking */ | |
475 | if (likely(!(rt_mode & IP_VS_RT_MODE_TUNNEL))) | |
476 | mtu = dst_mtu(&rt->dst); | |
477 | else { | |
4115ded1 JA |
478 | mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr); |
479 | if (mtu < IPV6_MIN_MTU) { | |
480 | IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__, | |
481 | IPV6_MIN_MTU); | |
482 | goto err_put; | |
483 | } | |
919aa0b2 | 484 | maybe_update_pmtu(skb_af, skb, mtu); |
fc604767 JA |
485 | } |
486 | ||
c63e4de2 | 487 | if (!ensure_mtu_is_adequate(skb_af, rt_mode, ipvsh, skb, mtu)) |
4115ded1 | 488 | goto err_put; |
4115ded1 JA |
489 | |
490 | skb_dst_drop(skb); | |
026ace06 JA |
491 | if (noref) { |
492 | if (!local) | |
dbfc4fb7 | 493 | skb_dst_set_noref(skb, &rt->dst); |
026ace06 JA |
494 | else |
495 | skb_dst_set(skb, dst_clone(&rt->dst)); | |
496 | } else | |
497 | skb_dst_set(skb, &rt->dst); | |
4115ded1 JA |
498 | |
499 | return local; | |
500 | ||
501 | err_put: | |
026ace06 JA |
502 | if (!noref) |
503 | dst_release(&rt->dst); | |
4115ded1 JA |
504 | return -1; |
505 | ||
506 | err_unreach: | |
326bf17e AG |
507 | /* The ip6_link_failure function requires the dev field to be set |
508 | * in order to get the net (further for the sake of fwmark | |
509 | * reflection). | |
510 | */ | |
511 | if (!skb->dev) | |
512 | skb->dev = skb_dst(skb)->dev; | |
513 | ||
4115ded1 JA |
514 | dst_link_failure(skb); |
515 | return -1; | |
38cdcc9a JV |
516 | } |
517 | #endif | |
518 | ||
1da177e4 | 519 | |
b8abdf09 JA |
520 | /* return NF_ACCEPT to allow forwarding or other NF_xxx on error */ |
521 | static inline int ip_vs_tunnel_xmit_prepare(struct sk_buff *skb, | |
522 | struct ip_vs_conn *cp) | |
523 | { | |
524 | int ret = NF_ACCEPT; | |
525 | ||
526 | skb->ipvs_property = 1; | |
527 | if (unlikely(cp->flags & IP_VS_CONN_F_NFCT)) | |
528 | ret = ip_vs_confirm_conntrack(skb); | |
529 | if (ret == NF_ACCEPT) { | |
530 | nf_reset(skb); | |
531 | skb_forward_csum(skb); | |
e3895c03 JA |
532 | if (!skb->sk) |
533 | skb_sender_cpu_clear(skb); | |
b8abdf09 JA |
534 | } |
535 | return ret; | |
536 | } | |
537 | ||
71563f34 AG |
538 | /* In the event of a remote destination, it's possible that we would have |
539 | * matches against an old socket (particularly a TIME-WAIT socket). This | |
540 | * causes havoc down the line (ip_local_out et. al. expect regular sockets | |
541 | * and invalid memory accesses will happen) so simply drop the association | |
542 | * in this case. | |
543 | */ | |
544 | static inline void ip_vs_drop_early_demux_sk(struct sk_buff *skb) | |
545 | { | |
546 | /* If dev is set, the packet came from the LOCAL_IN callback and | |
547 | * not from a local TCP socket. | |
548 | */ | |
549 | if (skb->dev) | |
550 | skb_orphan(skb); | |
551 | } | |
552 | ||
b8abdf09 JA |
553 | /* return NF_STOLEN (sent) or NF_ACCEPT if local=1 (not sent) */ |
554 | static inline int ip_vs_nat_send_or_cont(int pf, struct sk_buff *skb, | |
555 | struct ip_vs_conn *cp, int local) | |
556 | { | |
557 | int ret = NF_STOLEN; | |
558 | ||
559 | skb->ipvs_property = 1; | |
560 | if (likely(!(cp->flags & IP_VS_CONN_F_NFCT))) | |
561 | ip_vs_notrack(skb); | |
562 | else | |
563 | ip_vs_update_conntrack(skb, cp, 1); | |
71563f34 AG |
564 | |
565 | /* Remove the early_demux association unless it's bound for the | |
566 | * exact same port and address on this host after translation. | |
567 | */ | |
568 | if (!local || cp->vport != cp->dport || | |
569 | !ip_vs_addr_equal(cp->af, &cp->vaddr, &cp->daddr)) | |
570 | ip_vs_drop_early_demux_sk(skb); | |
571 | ||
b8abdf09 JA |
572 | if (!local) { |
573 | skb_forward_csum(skb); | |
e3895c03 JA |
574 | if (!skb->sk) |
575 | skb_sender_cpu_clear(skb); | |
7026b1dd DM |
576 | NF_HOOK(pf, NF_INET_LOCAL_OUT, NULL, skb, |
577 | NULL, skb_dst(skb)->dev, dst_output_sk); | |
b8abdf09 JA |
578 | } else |
579 | ret = NF_ACCEPT; | |
71563f34 | 580 | |
b8abdf09 JA |
581 | return ret; |
582 | } | |
583 | ||
584 | /* return NF_STOLEN (sent) or NF_ACCEPT if local=1 (not sent) */ | |
585 | static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb, | |
586 | struct ip_vs_conn *cp, int local) | |
587 | { | |
588 | int ret = NF_STOLEN; | |
589 | ||
590 | skb->ipvs_property = 1; | |
591 | if (likely(!(cp->flags & IP_VS_CONN_F_NFCT))) | |
592 | ip_vs_notrack(skb); | |
593 | if (!local) { | |
71563f34 | 594 | ip_vs_drop_early_demux_sk(skb); |
b8abdf09 | 595 | skb_forward_csum(skb); |
e3895c03 JA |
596 | if (!skb->sk) |
597 | skb_sender_cpu_clear(skb); | |
7026b1dd DM |
598 | NF_HOOK(pf, NF_INET_LOCAL_OUT, NULL, skb, |
599 | NULL, skb_dst(skb)->dev, dst_output_sk); | |
b8abdf09 JA |
600 | } else |
601 | ret = NF_ACCEPT; | |
602 | return ret; | |
603 | } | |
1da177e4 LT |
604 | |
605 | ||
606 | /* | |
607 | * NULL transmitter (do nothing except return NF_ACCEPT) | |
608 | */ | |
609 | int | |
610 | ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
d4383f04 | 611 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
1da177e4 LT |
612 | { |
613 | /* we do not touch skb and do not need pskb ptr */ | |
b8abdf09 | 614 | return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1); |
1da177e4 LT |
615 | } |
616 | ||
617 | ||
618 | /* | |
619 | * Bypass transmitter | |
620 | * Let packets bypass the destination when the destination is not | |
621 | * available, it may be only used in transparent cache cluster. | |
622 | */ | |
623 | int | |
624 | ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
d4383f04 | 625 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
1da177e4 | 626 | { |
eddc9ec5 | 627 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
628 | |
629 | EnterFunction(10); | |
630 | ||
026ace06 | 631 | rcu_read_lock(); |
4a4739d5 | 632 | if (__ip_vs_get_out_rt(cp->af, skb, NULL, iph->daddr, |
c63e4de2 | 633 | IP_VS_RT_MODE_NON_LOCAL, NULL, ipvsh) < 0) |
1da177e4 | 634 | goto tx_error; |
1da177e4 | 635 | |
4115ded1 | 636 | ip_send_check(iph); |
1da177e4 LT |
637 | |
638 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 639 | skb->ignore_df = 1; |
1da177e4 | 640 | |
b8abdf09 | 641 | ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0); |
026ace06 | 642 | rcu_read_unlock(); |
1da177e4 LT |
643 | |
644 | LeaveFunction(10); | |
645 | return NF_STOLEN; | |
646 | ||
1da177e4 LT |
647 | tx_error: |
648 | kfree_skb(skb); | |
026ace06 | 649 | rcu_read_unlock(); |
1da177e4 LT |
650 | LeaveFunction(10); |
651 | return NF_STOLEN; | |
652 | } | |
653 | ||
b3cdd2a7 JV |
654 | #ifdef CONFIG_IP_VS_IPV6 |
655 | int | |
656 | ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
4115ded1 | 657 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
b3cdd2a7 | 658 | { |
b3cdd2a7 JV |
659 | EnterFunction(10); |
660 | ||
026ace06 | 661 | rcu_read_lock(); |
4a4739d5 | 662 | if (__ip_vs_get_out_rt_v6(cp->af, skb, NULL, &ipvsh->daddr.in6, NULL, |
4115ded1 | 663 | ipvsh, 0, IP_VS_RT_MODE_NON_LOCAL) < 0) |
b3cdd2a7 | 664 | goto tx_error; |
b3cdd2a7 JV |
665 | |
666 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 667 | skb->ignore_df = 1; |
b3cdd2a7 | 668 | |
b8abdf09 | 669 | ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0); |
026ace06 | 670 | rcu_read_unlock(); |
b3cdd2a7 JV |
671 | |
672 | LeaveFunction(10); | |
673 | return NF_STOLEN; | |
674 | ||
b3cdd2a7 JV |
675 | tx_error: |
676 | kfree_skb(skb); | |
026ace06 | 677 | rcu_read_unlock(); |
b3cdd2a7 JV |
678 | LeaveFunction(10); |
679 | return NF_STOLEN; | |
680 | } | |
681 | #endif | |
1da177e4 LT |
682 | |
683 | /* | |
684 | * NAT transmitter (only for outside-to-inside nat forwarding) | |
685 | * Not used for related ICMP | |
686 | */ | |
687 | int | |
688 | ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
d4383f04 | 689 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
1da177e4 LT |
690 | { |
691 | struct rtable *rt; /* Route to the other host */ | |
4115ded1 | 692 | int local, rc, was_input; |
1da177e4 LT |
693 | |
694 | EnterFunction(10); | |
695 | ||
026ace06 | 696 | rcu_read_lock(); |
1da177e4 LT |
697 | /* check if it is a connection of no-client-port */ |
698 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { | |
014d730d | 699 | __be16 _pt, *p; |
4115ded1 JA |
700 | |
701 | p = skb_header_pointer(skb, ipvsh->len, sizeof(_pt), &_pt); | |
1da177e4 LT |
702 | if (p == NULL) |
703 | goto tx_error; | |
704 | ip_vs_conn_fill_cport(cp, *p); | |
705 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); | |
706 | } | |
707 | ||
4115ded1 | 708 | was_input = rt_is_input_route(skb_rtable(skb)); |
4a4739d5 | 709 | local = __ip_vs_get_out_rt(cp->af, skb, cp->dest, cp->daddr.ip, |
4115ded1 JA |
710 | IP_VS_RT_MODE_LOCAL | |
711 | IP_VS_RT_MODE_NON_LOCAL | | |
c63e4de2 | 712 | IP_VS_RT_MODE_RDR, NULL, ipvsh); |
4115ded1 JA |
713 | if (local < 0) |
714 | goto tx_error; | |
715 | rt = skb_rtable(skb); | |
fc604767 JA |
716 | /* |
717 | * Avoid duplicate tuple in reply direction for NAT traffic | |
718 | * to local address when connection is sync-ed | |
719 | */ | |
c0cd1156 | 720 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
721 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
722 | enum ip_conntrack_info ctinfo; | |
05b4b065 | 723 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
fc604767 JA |
724 | |
725 | if (ct && !nf_ct_is_untracked(ct)) { | |
0d79641a JA |
726 | IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0, |
727 | "ip_vs_nat_xmit(): " | |
fc604767 | 728 | "stopping DNAT to local address"); |
4115ded1 | 729 | goto tx_error; |
fc604767 JA |
730 | } |
731 | } | |
732 | #endif | |
733 | ||
734 | /* From world but DNAT to loopback address? */ | |
4115ded1 | 735 | if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) { |
0d79641a | 736 | IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): " |
fc604767 | 737 | "stopping DNAT to loopback address"); |
4115ded1 | 738 | goto tx_error; |
1da177e4 LT |
739 | } |
740 | ||
741 | /* copy-on-write the packet before mangling it */ | |
af1e1cf0 | 742 | if (!skb_make_writable(skb, sizeof(struct iphdr))) |
4115ded1 | 743 | goto tx_error; |
1da177e4 | 744 | |
d8d1f30b | 745 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
4115ded1 | 746 | goto tx_error; |
1da177e4 | 747 | |
1da177e4 | 748 | /* mangle the packet */ |
d4383f04 | 749 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp, ipvsh)) |
4115ded1 | 750 | goto tx_error; |
e7ade46a | 751 | ip_hdr(skb)->daddr = cp->daddr.ip; |
eddc9ec5 | 752 | ip_send_check(ip_hdr(skb)); |
1da177e4 | 753 | |
0d79641a | 754 | IP_VS_DBG_PKT(10, AF_INET, pp, skb, 0, "After DNAT"); |
1da177e4 LT |
755 | |
756 | /* FIXME: when application helper enlarges the packet and the length | |
757 | is larger than the MTU of outgoing device, there will be still | |
758 | MTU problem. */ | |
759 | ||
760 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 761 | skb->ignore_df = 1; |
1da177e4 | 762 | |
b8abdf09 | 763 | rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local); |
026ace06 | 764 | rcu_read_unlock(); |
1da177e4 LT |
765 | |
766 | LeaveFunction(10); | |
b8abdf09 | 767 | return rc; |
1da177e4 | 768 | |
1da177e4 | 769 | tx_error: |
1da177e4 | 770 | kfree_skb(skb); |
026ace06 | 771 | rcu_read_unlock(); |
f4bc17cd | 772 | LeaveFunction(10); |
1da177e4 | 773 | return NF_STOLEN; |
1da177e4 LT |
774 | } |
775 | ||
b3cdd2a7 JV |
776 | #ifdef CONFIG_IP_VS_IPV6 |
777 | int | |
778 | ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
4115ded1 | 779 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
b3cdd2a7 JV |
780 | { |
781 | struct rt6_info *rt; /* Route to the other host */ | |
b8abdf09 | 782 | int local, rc; |
b3cdd2a7 JV |
783 | |
784 | EnterFunction(10); | |
785 | ||
026ace06 | 786 | rcu_read_lock(); |
b3cdd2a7 | 787 | /* check if it is a connection of no-client-port */ |
4115ded1 | 788 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT && !ipvsh->fragoffs)) { |
b3cdd2a7 | 789 | __be16 _pt, *p; |
4115ded1 | 790 | p = skb_header_pointer(skb, ipvsh->len, sizeof(_pt), &_pt); |
b3cdd2a7 JV |
791 | if (p == NULL) |
792 | goto tx_error; | |
793 | ip_vs_conn_fill_cport(cp, *p); | |
794 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); | |
795 | } | |
796 | ||
4a4739d5 AG |
797 | local = __ip_vs_get_out_rt_v6(cp->af, skb, cp->dest, &cp->daddr.in6, |
798 | NULL, ipvsh, 0, | |
4115ded1 JA |
799 | IP_VS_RT_MODE_LOCAL | |
800 | IP_VS_RT_MODE_NON_LOCAL | | |
801 | IP_VS_RT_MODE_RDR); | |
802 | if (local < 0) | |
803 | goto tx_error; | |
804 | rt = (struct rt6_info *) skb_dst(skb); | |
fc604767 JA |
805 | /* |
806 | * Avoid duplicate tuple in reply direction for NAT traffic | |
807 | * to local address when connection is sync-ed | |
808 | */ | |
c0cd1156 | 809 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
810 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
811 | enum ip_conntrack_info ctinfo; | |
05b4b065 | 812 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
fc604767 JA |
813 | |
814 | if (ct && !nf_ct_is_untracked(ct)) { | |
0d79641a | 815 | IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0, |
fc604767 JA |
816 | "ip_vs_nat_xmit_v6(): " |
817 | "stopping DNAT to local address"); | |
4115ded1 | 818 | goto tx_error; |
fc604767 JA |
819 | } |
820 | } | |
821 | #endif | |
822 | ||
823 | /* From world but DNAT to loopback address? */ | |
824 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && | |
fd0273d7 | 825 | ipv6_addr_type(&cp->daddr.in6) & IPV6_ADDR_LOOPBACK) { |
0d79641a | 826 | IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, 0, |
fc604767 JA |
827 | "ip_vs_nat_xmit_v6(): " |
828 | "stopping DNAT to loopback address"); | |
4115ded1 | 829 | goto tx_error; |
b3cdd2a7 JV |
830 | } |
831 | ||
832 | /* copy-on-write the packet before mangling it */ | |
833 | if (!skb_make_writable(skb, sizeof(struct ipv6hdr))) | |
4115ded1 | 834 | goto tx_error; |
b3cdd2a7 | 835 | |
d8d1f30b | 836 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
4115ded1 | 837 | goto tx_error; |
b3cdd2a7 | 838 | |
b3cdd2a7 | 839 | /* mangle the packet */ |
4115ded1 | 840 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp, ipvsh)) |
b3cdd2a7 | 841 | goto tx_error; |
4e3fd7a0 | 842 | ipv6_hdr(skb)->daddr = cp->daddr.in6; |
fc604767 | 843 | |
0d79641a | 844 | IP_VS_DBG_PKT(10, AF_INET6, pp, skb, 0, "After DNAT"); |
b3cdd2a7 JV |
845 | |
846 | /* FIXME: when application helper enlarges the packet and the length | |
847 | is larger than the MTU of outgoing device, there will be still | |
848 | MTU problem. */ | |
849 | ||
850 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 851 | skb->ignore_df = 1; |
b3cdd2a7 | 852 | |
b8abdf09 | 853 | rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local); |
026ace06 | 854 | rcu_read_unlock(); |
b3cdd2a7 JV |
855 | |
856 | LeaveFunction(10); | |
b8abdf09 | 857 | return rc; |
b3cdd2a7 | 858 | |
b3cdd2a7 JV |
859 | tx_error: |
860 | LeaveFunction(10); | |
861 | kfree_skb(skb); | |
026ace06 | 862 | rcu_read_unlock(); |
b3cdd2a7 | 863 | return NF_STOLEN; |
b3cdd2a7 JV |
864 | } |
865 | #endif | |
866 | ||
8052ba29 AG |
867 | /* When forwarding a packet, we must ensure that we've got enough headroom |
868 | * for the encapsulation packet in the skb. This also gives us an | |
869 | * opportunity to figure out what the payload_len, dsfield, ttl, and df | |
870 | * values should be, so that we won't need to look at the old ip header | |
871 | * again | |
872 | */ | |
873 | static struct sk_buff * | |
874 | ip_vs_prepare_tunneled_skb(struct sk_buff *skb, int skb_af, | |
875 | unsigned int max_headroom, __u8 *next_protocol, | |
876 | __u32 *payload_len, __u8 *dsfield, __u8 *ttl, | |
877 | __be16 *df) | |
878 | { | |
879 | struct sk_buff *new_skb = NULL; | |
880 | struct iphdr *old_iph = NULL; | |
881 | #ifdef CONFIG_IP_VS_IPV6 | |
882 | struct ipv6hdr *old_ipv6h = NULL; | |
883 | #endif | |
884 | ||
71563f34 AG |
885 | ip_vs_drop_early_demux_sk(skb); |
886 | ||
8052ba29 AG |
887 | if (skb_headroom(skb) < max_headroom || skb_cloned(skb)) { |
888 | new_skb = skb_realloc_headroom(skb, max_headroom); | |
889 | if (!new_skb) | |
890 | goto error; | |
50656d9d CO |
891 | if (skb->sk) |
892 | skb_set_owner_w(new_skb, skb->sk); | |
8052ba29 AG |
893 | consume_skb(skb); |
894 | skb = new_skb; | |
895 | } | |
896 | ||
897 | #ifdef CONFIG_IP_VS_IPV6 | |
898 | if (skb_af == AF_INET6) { | |
899 | old_ipv6h = ipv6_hdr(skb); | |
900 | *next_protocol = IPPROTO_IPV6; | |
901 | if (payload_len) | |
902 | *payload_len = | |
903 | ntohs(old_ipv6h->payload_len) + | |
904 | sizeof(*old_ipv6h); | |
905 | *dsfield = ipv6_get_dsfield(old_ipv6h); | |
906 | *ttl = old_ipv6h->hop_limit; | |
907 | if (df) | |
908 | *df = 0; | |
909 | } else | |
910 | #endif | |
911 | { | |
912 | old_iph = ip_hdr(skb); | |
913 | /* Copy DF, reset fragment offset and MF */ | |
914 | if (df) | |
915 | *df = (old_iph->frag_off & htons(IP_DF)); | |
916 | *next_protocol = IPPROTO_IPIP; | |
917 | ||
918 | /* fix old IP header checksum */ | |
919 | ip_send_check(old_iph); | |
920 | *dsfield = ipv4_get_dsfield(old_iph); | |
921 | *ttl = old_iph->ttl; | |
922 | if (payload_len) | |
923 | *payload_len = ntohs(old_iph->tot_len); | |
924 | } | |
925 | ||
926 | return skb; | |
927 | error: | |
928 | kfree_skb(skb); | |
929 | return ERR_PTR(-ENOMEM); | |
930 | } | |
931 | ||
932 | static inline int __tun_gso_type_mask(int encaps_af, int orig_af) | |
933 | { | |
934 | if (encaps_af == AF_INET) { | |
935 | if (orig_af == AF_INET) | |
936 | return SKB_GSO_IPIP; | |
937 | ||
938 | return SKB_GSO_SIT; | |
939 | } | |
940 | ||
941 | /* GSO: we need to provide proper SKB_GSO_ value for IPv6: | |
942 | * SKB_GSO_SIT/IPV6 | |
943 | */ | |
944 | return 0; | |
945 | } | |
1da177e4 LT |
946 | |
947 | /* | |
948 | * IP Tunneling transmitter | |
949 | * | |
950 | * This function encapsulates the packet in a new IP packet, its | |
951 | * destination will be set to cp->daddr. Most code of this function | |
952 | * is taken from ipip.c. | |
953 | * | |
954 | * It is used in VS/TUN cluster. The load balancer selects a real | |
955 | * server from a cluster based on a scheduling algorithm, | |
956 | * encapsulates the request packet and forwards it to the selected | |
957 | * server. For example, all real servers are configured with | |
958 | * "ifconfig tunl0 <Virtual IP Address> up". When the server receives | |
959 | * the encapsulated packet, it will decapsulate the packet, processe | |
960 | * the request and return the response packets directly to the client | |
961 | * without passing the load balancer. This can greatly increase the | |
962 | * scalability of virtual server. | |
963 | * | |
964 | * Used for ANY protocol | |
965 | */ | |
966 | int | |
967 | ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
d4383f04 | 968 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
1da177e4 | 969 | { |
b6a7719a HFS |
970 | struct net *net = skb_net(skb); |
971 | struct netns_ipvs *ipvs = net_ipvs(net); | |
1da177e4 | 972 | struct rtable *rt; /* Route to the other host */ |
c92f5ca2 | 973 | __be32 saddr; /* Source for tunnel */ |
1da177e4 | 974 | struct net_device *tdev; /* Device to other host */ |
8052ba29 AG |
975 | __u8 next_protocol = 0; |
976 | __u8 dsfield = 0; | |
977 | __u8 ttl = 0; | |
978 | __be16 df = 0; | |
979 | __be16 *dfp = NULL; | |
1da177e4 | 980 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 981 | unsigned int max_headroom; /* The extra header space needed */ |
4115ded1 | 982 | int ret, local; |
1da177e4 LT |
983 | |
984 | EnterFunction(10); | |
985 | ||
026ace06 | 986 | rcu_read_lock(); |
4a4739d5 | 987 | local = __ip_vs_get_out_rt(cp->af, skb, cp->dest, cp->daddr.ip, |
4115ded1 JA |
988 | IP_VS_RT_MODE_LOCAL | |
989 | IP_VS_RT_MODE_NON_LOCAL | | |
990 | IP_VS_RT_MODE_CONNECT | | |
c63e4de2 | 991 | IP_VS_RT_MODE_TUNNEL, &saddr, ipvsh); |
4115ded1 JA |
992 | if (local < 0) |
993 | goto tx_error; | |
026ace06 JA |
994 | if (local) { |
995 | rcu_read_unlock(); | |
b8abdf09 | 996 | return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1); |
026ace06 | 997 | } |
1da177e4 | 998 | |
4115ded1 | 999 | rt = skb_rtable(skb); |
d8d1f30b | 1000 | tdev = rt->dst.dev; |
1da177e4 | 1001 | |
1da177e4 LT |
1002 | /* |
1003 | * Okay, now see if we can stuff it in the buffer as-is. | |
1004 | */ | |
1005 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr); | |
1006 | ||
8052ba29 AG |
1007 | /* We only care about the df field if sysctl_pmtu_disc(ipvs) is set */ |
1008 | dfp = sysctl_pmtu_disc(ipvs) ? &df : NULL; | |
1009 | skb = ip_vs_prepare_tunneled_skb(skb, cp->af, max_headroom, | |
1010 | &next_protocol, NULL, &dsfield, | |
1011 | &ttl, dfp); | |
1012 | if (IS_ERR(skb)) | |
1013 | goto tx_error; | |
1da177e4 | 1014 | |
8052ba29 AG |
1015 | skb = iptunnel_handle_offloads( |
1016 | skb, false, __tun_gso_type_mask(AF_INET, cp->af)); | |
ea1d5d77 JA |
1017 | if (IS_ERR(skb)) |
1018 | goto tx_error; | |
1019 | ||
1020 | skb->transport_header = skb->network_header; | |
1021 | ||
e2d1bca7 ACM |
1022 | skb_push(skb, sizeof(struct iphdr)); |
1023 | skb_reset_network_header(skb); | |
1da177e4 LT |
1024 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1025 | ||
1da177e4 LT |
1026 | /* |
1027 | * Push down and install the IPIP header. | |
1028 | */ | |
eddc9ec5 | 1029 | iph = ip_hdr(skb); |
1da177e4 LT |
1030 | iph->version = 4; |
1031 | iph->ihl = sizeof(struct iphdr)>>2; | |
1032 | iph->frag_off = df; | |
8052ba29 AG |
1033 | iph->protocol = next_protocol; |
1034 | iph->tos = dsfield; | |
c92f5ca2 JA |
1035 | iph->daddr = cp->daddr.ip; |
1036 | iph->saddr = saddr; | |
8052ba29 | 1037 | iph->ttl = ttl; |
b6a7719a | 1038 | ip_select_ident(net, skb, NULL); |
1da177e4 LT |
1039 | |
1040 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 1041 | skb->ignore_df = 1; |
1da177e4 | 1042 | |
b8abdf09 | 1043 | ret = ip_vs_tunnel_xmit_prepare(skb, cp); |
f4bc17cd JA |
1044 | if (ret == NF_ACCEPT) |
1045 | ip_local_out(skb); | |
1046 | else if (ret == NF_DROP) | |
1047 | kfree_skb(skb); | |
026ace06 | 1048 | rcu_read_unlock(); |
1da177e4 LT |
1049 | |
1050 | LeaveFunction(10); | |
1051 | ||
1052 | return NF_STOLEN; | |
1053 | ||
1da177e4 | 1054 | tx_error: |
ea1d5d77 JA |
1055 | if (!IS_ERR(skb)) |
1056 | kfree_skb(skb); | |
026ace06 | 1057 | rcu_read_unlock(); |
1da177e4 LT |
1058 | LeaveFunction(10); |
1059 | return NF_STOLEN; | |
1060 | } | |
1061 | ||
b3cdd2a7 JV |
1062 | #ifdef CONFIG_IP_VS_IPV6 |
1063 | int | |
1064 | ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
d4383f04 | 1065 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
b3cdd2a7 JV |
1066 | { |
1067 | struct rt6_info *rt; /* Route to the other host */ | |
714f095f | 1068 | struct in6_addr saddr; /* Source for tunnel */ |
b3cdd2a7 | 1069 | struct net_device *tdev; /* Device to other host */ |
8052ba29 AG |
1070 | __u8 next_protocol = 0; |
1071 | __u32 payload_len = 0; | |
1072 | __u8 dsfield = 0; | |
1073 | __u8 ttl = 0; | |
b3cdd2a7 JV |
1074 | struct ipv6hdr *iph; /* Our new IP header */ |
1075 | unsigned int max_headroom; /* The extra header space needed */ | |
4115ded1 | 1076 | int ret, local; |
b3cdd2a7 JV |
1077 | |
1078 | EnterFunction(10); | |
1079 | ||
026ace06 | 1080 | rcu_read_lock(); |
4a4739d5 | 1081 | local = __ip_vs_get_out_rt_v6(cp->af, skb, cp->dest, &cp->daddr.in6, |
4115ded1 JA |
1082 | &saddr, ipvsh, 1, |
1083 | IP_VS_RT_MODE_LOCAL | | |
1084 | IP_VS_RT_MODE_NON_LOCAL | | |
1085 | IP_VS_RT_MODE_TUNNEL); | |
1086 | if (local < 0) | |
1087 | goto tx_error; | |
026ace06 JA |
1088 | if (local) { |
1089 | rcu_read_unlock(); | |
b8abdf09 | 1090 | return ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 1); |
026ace06 | 1091 | } |
b3cdd2a7 | 1092 | |
4115ded1 | 1093 | rt = (struct rt6_info *) skb_dst(skb); |
d8d1f30b | 1094 | tdev = rt->dst.dev; |
b3cdd2a7 | 1095 | |
b3cdd2a7 JV |
1096 | /* |
1097 | * Okay, now see if we can stuff it in the buffer as-is. | |
1098 | */ | |
1099 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr); | |
1100 | ||
8052ba29 AG |
1101 | skb = ip_vs_prepare_tunneled_skb(skb, cp->af, max_headroom, |
1102 | &next_protocol, &payload_len, | |
1103 | &dsfield, &ttl, NULL); | |
1104 | if (IS_ERR(skb)) | |
1105 | goto tx_error; | |
b3cdd2a7 | 1106 | |
8052ba29 AG |
1107 | skb = iptunnel_handle_offloads( |
1108 | skb, false, __tun_gso_type_mask(AF_INET6, cp->af)); | |
ea1d5d77 JA |
1109 | if (IS_ERR(skb)) |
1110 | goto tx_error; | |
1111 | ||
714f095f | 1112 | skb->transport_header = skb->network_header; |
b3cdd2a7 JV |
1113 | |
1114 | skb_push(skb, sizeof(struct ipv6hdr)); | |
1115 | skb_reset_network_header(skb); | |
1116 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
1117 | ||
b3cdd2a7 JV |
1118 | /* |
1119 | * Push down and install the IPIP header. | |
1120 | */ | |
1121 | iph = ipv6_hdr(skb); | |
1122 | iph->version = 6; | |
8052ba29 AG |
1123 | iph->nexthdr = next_protocol; |
1124 | iph->payload_len = htons(payload_len); | |
b3cdd2a7 | 1125 | memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl)); |
8052ba29 | 1126 | ipv6_change_dsfield(iph, 0, dsfield); |
4e3fd7a0 AD |
1127 | iph->daddr = cp->daddr.in6; |
1128 | iph->saddr = saddr; | |
8052ba29 | 1129 | iph->hop_limit = ttl; |
b3cdd2a7 JV |
1130 | |
1131 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 1132 | skb->ignore_df = 1; |
b3cdd2a7 | 1133 | |
b8abdf09 | 1134 | ret = ip_vs_tunnel_xmit_prepare(skb, cp); |
f4bc17cd JA |
1135 | if (ret == NF_ACCEPT) |
1136 | ip6_local_out(skb); | |
1137 | else if (ret == NF_DROP) | |
1138 | kfree_skb(skb); | |
026ace06 | 1139 | rcu_read_unlock(); |
b3cdd2a7 JV |
1140 | |
1141 | LeaveFunction(10); | |
1142 | ||
1143 | return NF_STOLEN; | |
1144 | ||
b3cdd2a7 | 1145 | tx_error: |
ea1d5d77 JA |
1146 | if (!IS_ERR(skb)) |
1147 | kfree_skb(skb); | |
026ace06 | 1148 | rcu_read_unlock(); |
b3cdd2a7 JV |
1149 | LeaveFunction(10); |
1150 | return NF_STOLEN; | |
1151 | } | |
1152 | #endif | |
1153 | ||
1da177e4 LT |
1154 | |
1155 | /* | |
1156 | * Direct Routing transmitter | |
1157 | * Used for ANY protocol | |
1158 | */ | |
1159 | int | |
1160 | ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
d4383f04 | 1161 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
1da177e4 | 1162 | { |
4115ded1 | 1163 | int local; |
1da177e4 LT |
1164 | |
1165 | EnterFunction(10); | |
1166 | ||
026ace06 | 1167 | rcu_read_lock(); |
4a4739d5 | 1168 | local = __ip_vs_get_out_rt(cp->af, skb, cp->dest, cp->daddr.ip, |
4115ded1 JA |
1169 | IP_VS_RT_MODE_LOCAL | |
1170 | IP_VS_RT_MODE_NON_LOCAL | | |
c63e4de2 | 1171 | IP_VS_RT_MODE_KNOWN_NH, NULL, ipvsh); |
4115ded1 | 1172 | if (local < 0) |
1da177e4 | 1173 | goto tx_error; |
026ace06 JA |
1174 | if (local) { |
1175 | rcu_read_unlock(); | |
4115ded1 | 1176 | return ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 1); |
026ace06 | 1177 | } |
1da177e4 | 1178 | |
eddc9ec5 | 1179 | ip_send_check(ip_hdr(skb)); |
1da177e4 | 1180 | |
1da177e4 | 1181 | /* Another hack: avoid icmp_send in ip_fragment */ |
60ff7467 | 1182 | skb->ignore_df = 1; |
1da177e4 | 1183 | |
b8abdf09 | 1184 | ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0); |
026ace06 | 1185 | rcu_read_unlock(); |
1da177e4 LT |
1186 | |
1187 | LeaveFunction(10); | |
1188 | return NF_STOLEN; | |
1189 | ||
1da177e4 LT |
1190 | tx_error: |
1191 | kfree_skb(skb); | |
026ace06 | 1192 | rcu_read_unlock(); |
1da177e4 LT |
1193 | LeaveFunction(10); |
1194 | return NF_STOLEN; | |
1195 | } | |
1196 | ||
b3cdd2a7 JV |
1197 | #ifdef CONFIG_IP_VS_IPV6 |
1198 | int | |
1199 | ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
4115ded1 | 1200 | struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh) |
b3cdd2a7 | 1201 | { |
4115ded1 | 1202 | int local; |
b3cdd2a7 JV |
1203 | |
1204 | EnterFunction(10); | |
1205 | ||
026ace06 | 1206 | rcu_read_lock(); |
4a4739d5 AG |
1207 | local = __ip_vs_get_out_rt_v6(cp->af, skb, cp->dest, &cp->daddr.in6, |
1208 | NULL, ipvsh, 0, | |
4115ded1 | 1209 | IP_VS_RT_MODE_LOCAL | |
48e8aa6e MKL |
1210 | IP_VS_RT_MODE_NON_LOCAL | |
1211 | IP_VS_RT_MODE_KNOWN_NH); | |
4115ded1 | 1212 | if (local < 0) |
b3cdd2a7 | 1213 | goto tx_error; |
026ace06 JA |
1214 | if (local) { |
1215 | rcu_read_unlock(); | |
4115ded1 | 1216 | return ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 1); |
026ace06 | 1217 | } |
b3cdd2a7 JV |
1218 | |
1219 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 1220 | skb->ignore_df = 1; |
b3cdd2a7 | 1221 | |
b8abdf09 | 1222 | ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0); |
026ace06 | 1223 | rcu_read_unlock(); |
b3cdd2a7 JV |
1224 | |
1225 | LeaveFunction(10); | |
1226 | return NF_STOLEN; | |
1227 | ||
b3cdd2a7 JV |
1228 | tx_error: |
1229 | kfree_skb(skb); | |
026ace06 | 1230 | rcu_read_unlock(); |
b3cdd2a7 JV |
1231 | LeaveFunction(10); |
1232 | return NF_STOLEN; | |
1233 | } | |
1234 | #endif | |
1235 | ||
1da177e4 LT |
1236 | |
1237 | /* | |
1238 | * ICMP packet transmitter | |
1239 | * called by the ip_vs_in_icmp | |
1240 | */ | |
1241 | int | |
1242 | ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
d4383f04 JDB |
1243 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum, |
1244 | struct ip_vs_iphdr *iph) | |
1da177e4 LT |
1245 | { |
1246 | struct rtable *rt; /* Route to the other host */ | |
1da177e4 | 1247 | int rc; |
fc604767 | 1248 | int local; |
4115ded1 | 1249 | int rt_mode, was_input; |
1da177e4 LT |
1250 | |
1251 | EnterFunction(10); | |
1252 | ||
1253 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be | |
1254 | forwarded directly here, because there is no need to | |
1255 | translate address/port back */ | |
1256 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { | |
1257 | if (cp->packet_xmit) | |
d4383f04 | 1258 | rc = cp->packet_xmit(skb, cp, pp, iph); |
1da177e4 LT |
1259 | else |
1260 | rc = NF_ACCEPT; | |
1261 | /* do not touch skb anymore */ | |
1262 | atomic_inc(&cp->in_pkts); | |
1da177e4 LT |
1263 | goto out; |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * mangle and send the packet here (only for VS/NAT) | |
1268 | */ | |
4115ded1 | 1269 | was_input = rt_is_input_route(skb_rtable(skb)); |
1da177e4 | 1270 | |
c92f5ca2 JA |
1271 | /* LOCALNODE from FORWARD hook is not supported */ |
1272 | rt_mode = (hooknum != NF_INET_FORWARD) ? | |
1273 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | | |
1274 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; | |
026ace06 | 1275 | rcu_read_lock(); |
4a4739d5 | 1276 | local = __ip_vs_get_out_rt(cp->af, skb, cp->dest, cp->daddr.ip, rt_mode, |
c63e4de2 | 1277 | NULL, iph); |
4115ded1 JA |
1278 | if (local < 0) |
1279 | goto tx_error; | |
1280 | rt = skb_rtable(skb); | |
fc604767 JA |
1281 | |
1282 | /* | |
1283 | * Avoid duplicate tuple in reply direction for NAT traffic | |
1284 | * to local address when connection is sync-ed | |
1285 | */ | |
c0cd1156 | 1286 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
1287 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
1288 | enum ip_conntrack_info ctinfo; | |
05b4b065 | 1289 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
fc604767 JA |
1290 | |
1291 | if (ct && !nf_ct_is_untracked(ct)) { | |
1292 | IP_VS_DBG(10, "%s(): " | |
1293 | "stopping DNAT to local address %pI4\n", | |
1294 | __func__, &cp->daddr.ip); | |
4115ded1 | 1295 | goto tx_error; |
fc604767 JA |
1296 | } |
1297 | } | |
1298 | #endif | |
1299 | ||
1300 | /* From world but DNAT to loopback address? */ | |
4115ded1 | 1301 | if (local && ipv4_is_loopback(cp->daddr.ip) && was_input) { |
fc604767 JA |
1302 | IP_VS_DBG(1, "%s(): " |
1303 | "stopping DNAT to loopback %pI4\n", | |
1304 | __func__, &cp->daddr.ip); | |
4115ded1 | 1305 | goto tx_error; |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | /* copy-on-write the packet before mangling it */ | |
af1e1cf0 | 1309 | if (!skb_make_writable(skb, offset)) |
4115ded1 | 1310 | goto tx_error; |
1da177e4 | 1311 | |
d8d1f30b | 1312 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
4115ded1 | 1313 | goto tx_error; |
1da177e4 | 1314 | |
1da177e4 LT |
1315 | ip_vs_nat_icmp(skb, pp, cp, 0); |
1316 | ||
1317 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 1318 | skb->ignore_df = 1; |
1da177e4 | 1319 | |
b8abdf09 | 1320 | rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local); |
026ace06 | 1321 | rcu_read_unlock(); |
1da177e4 LT |
1322 | goto out; |
1323 | ||
1da177e4 | 1324 | tx_error: |
026ace06 JA |
1325 | kfree_skb(skb); |
1326 | rcu_read_unlock(); | |
1da177e4 LT |
1327 | rc = NF_STOLEN; |
1328 | out: | |
1329 | LeaveFunction(10); | |
1330 | return rc; | |
1da177e4 | 1331 | } |
b3cdd2a7 JV |
1332 | |
1333 | #ifdef CONFIG_IP_VS_IPV6 | |
1334 | int | |
1335 | ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
d4383f04 | 1336 | struct ip_vs_protocol *pp, int offset, unsigned int hooknum, |
4115ded1 | 1337 | struct ip_vs_iphdr *ipvsh) |
b3cdd2a7 JV |
1338 | { |
1339 | struct rt6_info *rt; /* Route to the other host */ | |
b3cdd2a7 | 1340 | int rc; |
fc604767 | 1341 | int local; |
c92f5ca2 | 1342 | int rt_mode; |
b3cdd2a7 JV |
1343 | |
1344 | EnterFunction(10); | |
1345 | ||
1346 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be | |
1347 | forwarded directly here, because there is no need to | |
1348 | translate address/port back */ | |
1349 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { | |
1350 | if (cp->packet_xmit) | |
4115ded1 | 1351 | rc = cp->packet_xmit(skb, cp, pp, ipvsh); |
b3cdd2a7 JV |
1352 | else |
1353 | rc = NF_ACCEPT; | |
1354 | /* do not touch skb anymore */ | |
1355 | atomic_inc(&cp->in_pkts); | |
1356 | goto out; | |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * mangle and send the packet here (only for VS/NAT) | |
1361 | */ | |
1362 | ||
c92f5ca2 JA |
1363 | /* LOCALNODE from FORWARD hook is not supported */ |
1364 | rt_mode = (hooknum != NF_INET_FORWARD) ? | |
1365 | IP_VS_RT_MODE_LOCAL | IP_VS_RT_MODE_NON_LOCAL | | |
1366 | IP_VS_RT_MODE_RDR : IP_VS_RT_MODE_NON_LOCAL; | |
026ace06 | 1367 | rcu_read_lock(); |
4a4739d5 AG |
1368 | local = __ip_vs_get_out_rt_v6(cp->af, skb, cp->dest, &cp->daddr.in6, |
1369 | NULL, ipvsh, 0, rt_mode); | |
4115ded1 JA |
1370 | if (local < 0) |
1371 | goto tx_error; | |
1372 | rt = (struct rt6_info *) skb_dst(skb); | |
fc604767 JA |
1373 | /* |
1374 | * Avoid duplicate tuple in reply direction for NAT traffic | |
1375 | * to local address when connection is sync-ed | |
1376 | */ | |
c0cd1156 | 1377 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
fc604767 JA |
1378 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { |
1379 | enum ip_conntrack_info ctinfo; | |
05b4b065 | 1380 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
fc604767 JA |
1381 | |
1382 | if (ct && !nf_ct_is_untracked(ct)) { | |
1383 | IP_VS_DBG(10, "%s(): " | |
1384 | "stopping DNAT to local address %pI6\n", | |
1385 | __func__, &cp->daddr.in6); | |
4115ded1 | 1386 | goto tx_error; |
fc604767 JA |
1387 | } |
1388 | } | |
1389 | #endif | |
1390 | ||
1391 | /* From world but DNAT to loopback address? */ | |
1392 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && | |
fd0273d7 | 1393 | ipv6_addr_type(&cp->daddr.in6) & IPV6_ADDR_LOOPBACK) { |
fc604767 JA |
1394 | IP_VS_DBG(1, "%s(): " |
1395 | "stopping DNAT to loopback %pI6\n", | |
1396 | __func__, &cp->daddr.in6); | |
4115ded1 | 1397 | goto tx_error; |
b3cdd2a7 JV |
1398 | } |
1399 | ||
1400 | /* copy-on-write the packet before mangling it */ | |
1401 | if (!skb_make_writable(skb, offset)) | |
4115ded1 | 1402 | goto tx_error; |
b3cdd2a7 | 1403 | |
d8d1f30b | 1404 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
4115ded1 | 1405 | goto tx_error; |
b3cdd2a7 | 1406 | |
b3cdd2a7 JV |
1407 | ip_vs_nat_icmp_v6(skb, pp, cp, 0); |
1408 | ||
1409 | /* Another hack: avoid icmp_send in ip_fragment */ | |
60ff7467 | 1410 | skb->ignore_df = 1; |
b3cdd2a7 | 1411 | |
b8abdf09 | 1412 | rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local); |
026ace06 | 1413 | rcu_read_unlock(); |
b3cdd2a7 JV |
1414 | goto out; |
1415 | ||
b3cdd2a7 | 1416 | tx_error: |
026ace06 JA |
1417 | kfree_skb(skb); |
1418 | rcu_read_unlock(); | |
b3cdd2a7 JV |
1419 | rc = NF_STOLEN; |
1420 | out: | |
1421 | LeaveFunction(10); | |
1422 | return rc; | |
b3cdd2a7 JV |
1423 | } |
1424 | #endif |