Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ip_vs_xmit.c: various packet transmitters for IPVS | |
3 | * | |
1da177e4 LT |
4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
5 | * Julian Anastasov <ja@ssi.bg> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * Changes: | |
13 | * | |
cb59155f JA |
14 | * Description of forwarding methods: |
15 | * - all transmitters are called from LOCAL_IN (remote clients) and | |
16 | * LOCAL_OUT (local clients) but for ICMP can be called from FORWARD | |
17 | * - not all connections have destination server, for example, | |
18 | * connections in backup server when fwmark is used | |
19 | * - bypass connections use daddr from packet | |
20 | * LOCAL_OUT rules: | |
21 | * - skb->dev is NULL, skb->protocol is not set (both are set in POST_ROUTING) | |
22 | * - skb->pkt_type is not set yet | |
23 | * - the only place where we can see skb->sk != NULL | |
1da177e4 LT |
24 | */ |
25 | ||
9aada7ac HE |
26 | #define KMSG_COMPONENT "IPVS" |
27 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
28 | ||
1da177e4 | 29 | #include <linux/kernel.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
1da177e4 | 31 | #include <linux/tcp.h> /* for tcphdr */ |
c439cb2e | 32 | #include <net/ip.h> |
1da177e4 LT |
33 | #include <net/tcp.h> /* for csum_tcpudp_magic */ |
34 | #include <net/udp.h> | |
35 | #include <net/icmp.h> /* for icmp_send */ | |
36 | #include <net/route.h> /* for ip_route_output */ | |
38cdcc9a JV |
37 | #include <net/ipv6.h> |
38 | #include <net/ip6_route.h> | |
714f095f | 39 | #include <net/addrconf.h> |
38cdcc9a | 40 | #include <linux/icmpv6.h> |
1da177e4 LT |
41 | #include <linux/netfilter.h> |
42 | #include <linux/netfilter_ipv4.h> | |
43 | ||
44 | #include <net/ip_vs.h> | |
45 | ||
17a8f8e3 CG |
46 | enum { |
47 | IP_VS_RT_MODE_LOCAL = 1, /* Allow local dest */ | |
48 | IP_VS_RT_MODE_NON_LOCAL = 2, /* Allow non-local dest */ | |
49 | IP_VS_RT_MODE_RDR = 4, /* Allow redirect from remote daddr to | |
50 | * local | |
51 | */ | |
52 | }; | |
1da177e4 LT |
53 | |
54 | /* | |
55 | * Destination cache to speed up outgoing route lookup | |
56 | */ | |
57 | static inline void | |
714f095f HS |
58 | __ip_vs_dst_set(struct ip_vs_dest *dest, u32 rtos, struct dst_entry *dst, |
59 | u32 dst_cookie) | |
1da177e4 LT |
60 | { |
61 | struct dst_entry *old_dst; | |
62 | ||
63 | old_dst = dest->dst_cache; | |
64 | dest->dst_cache = dst; | |
65 | dest->dst_rtos = rtos; | |
714f095f | 66 | dest->dst_cookie = dst_cookie; |
1da177e4 LT |
67 | dst_release(old_dst); |
68 | } | |
69 | ||
70 | static inline struct dst_entry * | |
714f095f | 71 | __ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos) |
1da177e4 LT |
72 | { |
73 | struct dst_entry *dst = dest->dst_cache; | |
74 | ||
75 | if (!dst) | |
76 | return NULL; | |
714f095f HS |
77 | if ((dst->obsolete || rtos != dest->dst_rtos) && |
78 | dst->ops->check(dst, dest->dst_cookie) == NULL) { | |
1da177e4 LT |
79 | dest->dst_cache = NULL; |
80 | dst_release(dst); | |
81 | return NULL; | |
82 | } | |
83 | dst_hold(dst); | |
84 | return dst; | |
85 | } | |
86 | ||
17a8f8e3 | 87 | /* Get route to destination or remote server */ |
ad1b30b1 | 88 | static struct rtable * |
fc604767 JA |
89 | __ip_vs_get_out_rt(struct sk_buff *skb, struct ip_vs_dest *dest, |
90 | __be32 daddr, u32 rtos, int rt_mode) | |
1da177e4 | 91 | { |
fc604767 | 92 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 93 | struct rtable *rt; /* Route to the other host */ |
fc604767 JA |
94 | struct rtable *ort; /* Original route */ |
95 | int local; | |
1da177e4 LT |
96 | |
97 | if (dest) { | |
98 | spin_lock(&dest->dst_lock); | |
99 | if (!(rt = (struct rtable *) | |
714f095f | 100 | __ip_vs_dst_check(dest, rtos))) { |
78fbfd8a | 101 | rt = ip_route_output(net, dest->addr.ip, 0, rtos, 0); |
b23dd4fe | 102 | if (IS_ERR(rt)) { |
1da177e4 | 103 | spin_unlock(&dest->dst_lock); |
14d5e834 HH |
104 | IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", |
105 | &dest->addr.ip); | |
1da177e4 LT |
106 | return NULL; |
107 | } | |
714f095f | 108 | __ip_vs_dst_set(dest, rtos, dst_clone(&rt->dst), 0); |
14d5e834 HH |
109 | IP_VS_DBG(10, "new dst %pI4, refcnt=%d, rtos=%X\n", |
110 | &dest->addr.ip, | |
d8d1f30b | 111 | atomic_read(&rt->dst.__refcnt), rtos); |
1da177e4 | 112 | } |
44e3125c | 113 | daddr = dest->addr.ip; |
1da177e4 LT |
114 | spin_unlock(&dest->dst_lock); |
115 | } else { | |
78fbfd8a | 116 | rt = ip_route_output(net, daddr, 0, rtos, 0); |
b23dd4fe | 117 | if (IS_ERR(rt)) { |
14d5e834 | 118 | IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n", |
fc604767 | 119 | &daddr); |
1da177e4 LT |
120 | return NULL; |
121 | } | |
122 | } | |
123 | ||
fc604767 | 124 | local = rt->rt_flags & RTCF_LOCAL; |
17a8f8e3 CG |
125 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
126 | rt_mode)) { | |
fc604767 JA |
127 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI4\n", |
128 | (rt->rt_flags & RTCF_LOCAL) ? | |
44e3125c | 129 | "local":"non-local", &daddr); |
fc604767 JA |
130 | ip_rt_put(rt); |
131 | return NULL; | |
132 | } | |
17a8f8e3 CG |
133 | if (local && !(rt_mode & IP_VS_RT_MODE_RDR) && |
134 | !((ort = skb_rtable(skb)) && ort->rt_flags & RTCF_LOCAL)) { | |
fc604767 JA |
135 | IP_VS_DBG_RL("Redirect from non-local address %pI4 to local " |
136 | "requires NAT method, dest: %pI4\n", | |
44e3125c | 137 | &ip_hdr(skb)->daddr, &daddr); |
fc604767 JA |
138 | ip_rt_put(rt); |
139 | return NULL; | |
140 | } | |
141 | if (unlikely(!local && ipv4_is_loopback(ip_hdr(skb)->saddr))) { | |
142 | IP_VS_DBG_RL("Stopping traffic from loopback address %pI4 " | |
143 | "to non-local address, dest: %pI4\n", | |
44e3125c | 144 | &ip_hdr(skb)->saddr, &daddr); |
fc604767 JA |
145 | ip_rt_put(rt); |
146 | return NULL; | |
147 | } | |
148 | ||
1da177e4 LT |
149 | return rt; |
150 | } | |
151 | ||
fc604767 JA |
152 | /* Reroute packet to local IPv4 stack after DNAT */ |
153 | static int | |
154 | __ip_vs_reroute_locally(struct sk_buff *skb) | |
155 | { | |
156 | struct rtable *rt = skb_rtable(skb); | |
157 | struct net_device *dev = rt->dst.dev; | |
158 | struct net *net = dev_net(dev); | |
159 | struct iphdr *iph = ip_hdr(skb); | |
160 | ||
c7537967 | 161 | if (rt_is_input_route(rt)) { |
fc604767 JA |
162 | unsigned long orefdst = skb->_skb_refdst; |
163 | ||
164 | if (ip_route_input(skb, iph->daddr, iph->saddr, | |
165 | iph->tos, skb->dev)) | |
166 | return 0; | |
167 | refdst_drop(orefdst); | |
168 | } else { | |
9d6ec938 DM |
169 | struct flowi4 fl4 = { |
170 | .daddr = iph->daddr, | |
171 | .saddr = iph->saddr, | |
172 | .flowi4_tos = RT_TOS(iph->tos), | |
173 | .flowi4_mark = skb->mark, | |
fc604767 | 174 | }; |
fc604767 | 175 | |
9d6ec938 | 176 | rt = ip_route_output_key(net, &fl4); |
b23dd4fe | 177 | if (IS_ERR(rt)) |
fc604767 JA |
178 | return 0; |
179 | if (!(rt->rt_flags & RTCF_LOCAL)) { | |
180 | ip_rt_put(rt); | |
181 | return 0; | |
182 | } | |
183 | /* Drop old route. */ | |
184 | skb_dst_drop(skb); | |
185 | skb_dst_set(skb, &rt->dst); | |
186 | } | |
187 | return 1; | |
188 | } | |
189 | ||
38cdcc9a | 190 | #ifdef CONFIG_IP_VS_IPV6 |
714f095f | 191 | |
fc604767 JA |
192 | static inline int __ip_vs_is_local_route6(struct rt6_info *rt) |
193 | { | |
194 | return rt->rt6i_dev && rt->rt6i_dev->flags & IFF_LOOPBACK; | |
195 | } | |
196 | ||
714f095f HS |
197 | static struct dst_entry * |
198 | __ip_vs_route_output_v6(struct net *net, struct in6_addr *daddr, | |
199 | struct in6_addr *ret_saddr, int do_xfrm) | |
200 | { | |
201 | struct dst_entry *dst; | |
4c9483b2 DM |
202 | struct flowi6 fl6 = { |
203 | .daddr = *daddr, | |
714f095f HS |
204 | }; |
205 | ||
4c9483b2 | 206 | dst = ip6_route_output(net, NULL, &fl6); |
714f095f HS |
207 | if (dst->error) |
208 | goto out_err; | |
209 | if (!ret_saddr) | |
210 | return dst; | |
4c9483b2 | 211 | if (ipv6_addr_any(&fl6.saddr) && |
714f095f | 212 | ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, |
4c9483b2 | 213 | &fl6.daddr, 0, &fl6.saddr) < 0) |
714f095f | 214 | goto out_err; |
452edd59 | 215 | if (do_xfrm) { |
4c9483b2 | 216 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 DM |
217 | if (IS_ERR(dst)) { |
218 | dst = NULL; | |
219 | goto out_err; | |
220 | } | |
221 | } | |
4c9483b2 | 222 | ipv6_addr_copy(ret_saddr, &fl6.saddr); |
714f095f HS |
223 | return dst; |
224 | ||
225 | out_err: | |
226 | dst_release(dst); | |
227 | IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n", daddr); | |
228 | return NULL; | |
229 | } | |
230 | ||
fc604767 JA |
231 | /* |
232 | * Get route to destination or remote server | |
fc604767 | 233 | */ |
38cdcc9a | 234 | static struct rt6_info * |
fc604767 JA |
235 | __ip_vs_get_out_rt_v6(struct sk_buff *skb, struct ip_vs_dest *dest, |
236 | struct in6_addr *daddr, struct in6_addr *ret_saddr, | |
237 | int do_xfrm, int rt_mode) | |
38cdcc9a | 238 | { |
fc604767 | 239 | struct net *net = dev_net(skb_dst(skb)->dev); |
38cdcc9a | 240 | struct rt6_info *rt; /* Route to the other host */ |
fc604767 | 241 | struct rt6_info *ort; /* Original route */ |
714f095f | 242 | struct dst_entry *dst; |
fc604767 | 243 | int local; |
38cdcc9a JV |
244 | |
245 | if (dest) { | |
246 | spin_lock(&dest->dst_lock); | |
714f095f | 247 | rt = (struct rt6_info *)__ip_vs_dst_check(dest, 0); |
38cdcc9a | 248 | if (!rt) { |
714f095f | 249 | u32 cookie; |
38cdcc9a | 250 | |
714f095f HS |
251 | dst = __ip_vs_route_output_v6(net, &dest->addr.in6, |
252 | &dest->dst_saddr, | |
253 | do_xfrm); | |
254 | if (!dst) { | |
38cdcc9a | 255 | spin_unlock(&dest->dst_lock); |
38cdcc9a JV |
256 | return NULL; |
257 | } | |
714f095f HS |
258 | rt = (struct rt6_info *) dst; |
259 | cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
260 | __ip_vs_dst_set(dest, 0, dst_clone(&rt->dst), cookie); | |
261 | IP_VS_DBG(10, "new dst %pI6, src %pI6, refcnt=%d\n", | |
262 | &dest->addr.in6, &dest->dst_saddr, | |
d8d1f30b | 263 | atomic_read(&rt->dst.__refcnt)); |
38cdcc9a | 264 | } |
714f095f HS |
265 | if (ret_saddr) |
266 | ipv6_addr_copy(ret_saddr, &dest->dst_saddr); | |
38cdcc9a JV |
267 | spin_unlock(&dest->dst_lock); |
268 | } else { | |
fc604767 | 269 | dst = __ip_vs_route_output_v6(net, daddr, ret_saddr, do_xfrm); |
714f095f | 270 | if (!dst) |
38cdcc9a | 271 | return NULL; |
714f095f | 272 | rt = (struct rt6_info *) dst; |
38cdcc9a JV |
273 | } |
274 | ||
fc604767 | 275 | local = __ip_vs_is_local_route6(rt); |
e58b3442 DM |
276 | if (!((local ? IP_VS_RT_MODE_LOCAL : IP_VS_RT_MODE_NON_LOCAL) & |
277 | rt_mode)) { | |
fc604767 JA |
278 | IP_VS_DBG_RL("Stopping traffic to %s address, dest: %pI6\n", |
279 | local ? "local":"non-local", daddr); | |
280 | dst_release(&rt->dst); | |
281 | return NULL; | |
282 | } | |
e58b3442 | 283 | if (local && !(rt_mode & IP_VS_RT_MODE_RDR) && |
fc604767 JA |
284 | !((ort = (struct rt6_info *) skb_dst(skb)) && |
285 | __ip_vs_is_local_route6(ort))) { | |
286 | IP_VS_DBG_RL("Redirect from non-local address %pI6 to local " | |
287 | "requires NAT method, dest: %pI6\n", | |
288 | &ipv6_hdr(skb)->daddr, daddr); | |
289 | dst_release(&rt->dst); | |
290 | return NULL; | |
291 | } | |
292 | if (unlikely(!local && (!skb->dev || skb->dev->flags & IFF_LOOPBACK) && | |
293 | ipv6_addr_type(&ipv6_hdr(skb)->saddr) & | |
294 | IPV6_ADDR_LOOPBACK)) { | |
295 | IP_VS_DBG_RL("Stopping traffic from loopback address %pI6 " | |
296 | "to non-local address, dest: %pI6\n", | |
297 | &ipv6_hdr(skb)->saddr, daddr); | |
298 | dst_release(&rt->dst); | |
299 | return NULL; | |
300 | } | |
301 | ||
38cdcc9a JV |
302 | return rt; |
303 | } | |
304 | #endif | |
305 | ||
1da177e4 LT |
306 | |
307 | /* | |
308 | * Release dest->dst_cache before a dest is removed | |
309 | */ | |
310 | void | |
311 | ip_vs_dst_reset(struct ip_vs_dest *dest) | |
312 | { | |
313 | struct dst_entry *old_dst; | |
314 | ||
315 | old_dst = dest->dst_cache; | |
316 | dest->dst_cache = NULL; | |
317 | dst_release(old_dst); | |
318 | } | |
319 | ||
f4bc17cd JA |
320 | #define IP_VS_XMIT_TUNNEL(skb, cp) \ |
321 | ({ \ | |
322 | int __ret = NF_ACCEPT; \ | |
323 | \ | |
cf356d69 | 324 | (skb)->ipvs_property = 1; \ |
f4bc17cd JA |
325 | if (unlikely((cp)->flags & IP_VS_CONN_F_NFCT)) \ |
326 | __ret = ip_vs_confirm_conntrack(skb, cp); \ | |
327 | if (__ret == NF_ACCEPT) { \ | |
328 | nf_reset(skb); \ | |
4256f1aa | 329 | skb_forward_csum(skb); \ |
f4bc17cd JA |
330 | } \ |
331 | __ret; \ | |
332 | }) | |
333 | ||
fc604767 | 334 | #define IP_VS_XMIT_NAT(pf, skb, cp, local) \ |
1da177e4 | 335 | do { \ |
cf356d69 | 336 | (skb)->ipvs_property = 1; \ |
f4bc17cd | 337 | if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \ |
cf356d69 | 338 | ip_vs_notrack(skb); \ |
f4bc17cd JA |
339 | else \ |
340 | ip_vs_update_conntrack(skb, cp, 1); \ | |
fc604767 JA |
341 | if (local) \ |
342 | return NF_ACCEPT; \ | |
ccc7911f | 343 | skb_forward_csum(skb); \ |
38cdcc9a | 344 | NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \ |
f4bc17cd JA |
345 | skb_dst(skb)->dev, dst_output); \ |
346 | } while (0) | |
347 | ||
fc604767 | 348 | #define IP_VS_XMIT(pf, skb, cp, local) \ |
f4bc17cd | 349 | do { \ |
cf356d69 | 350 | (skb)->ipvs_property = 1; \ |
f4bc17cd | 351 | if (likely(!((cp)->flags & IP_VS_CONN_F_NFCT))) \ |
cf356d69 | 352 | ip_vs_notrack(skb); \ |
fc604767 JA |
353 | if (local) \ |
354 | return NF_ACCEPT; \ | |
f4bc17cd JA |
355 | skb_forward_csum(skb); \ |
356 | NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \ | |
357 | skb_dst(skb)->dev, dst_output); \ | |
1da177e4 LT |
358 | } while (0) |
359 | ||
360 | ||
361 | /* | |
362 | * NULL transmitter (do nothing except return NF_ACCEPT) | |
363 | */ | |
364 | int | |
365 | ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
366 | struct ip_vs_protocol *pp) | |
367 | { | |
368 | /* we do not touch skb and do not need pskb ptr */ | |
fc604767 | 369 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); |
1da177e4 LT |
370 | } |
371 | ||
372 | ||
373 | /* | |
374 | * Bypass transmitter | |
375 | * Let packets bypass the destination when the destination is not | |
376 | * available, it may be only used in transparent cache cluster. | |
377 | */ | |
378 | int | |
379 | ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
380 | struct ip_vs_protocol *pp) | |
381 | { | |
382 | struct rtable *rt; /* Route to the other host */ | |
eddc9ec5 | 383 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 384 | int mtu; |
1da177e4 LT |
385 | |
386 | EnterFunction(10); | |
387 | ||
17a8f8e3 CG |
388 | if (!(rt = __ip_vs_get_out_rt(skb, NULL, iph->daddr, RT_TOS(iph->tos), |
389 | IP_VS_RT_MODE_NON_LOCAL))) | |
1da177e4 | 390 | goto tx_error_icmp; |
1da177e4 LT |
391 | |
392 | /* MTU checking */ | |
d8d1f30b | 393 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
394 | if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) && |
395 | !skb_is_gso(skb)) { | |
1da177e4 LT |
396 | ip_rt_put(rt); |
397 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); | |
1e3e238e | 398 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
1da177e4 LT |
399 | goto tx_error; |
400 | } | |
401 | ||
402 | /* | |
403 | * Call ip_send_check because we are not sure it is called | |
404 | * after ip_defrag. Is copy-on-write needed? | |
405 | */ | |
406 | if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) { | |
407 | ip_rt_put(rt); | |
408 | return NF_STOLEN; | |
409 | } | |
eddc9ec5 | 410 | ip_send_check(ip_hdr(skb)); |
1da177e4 LT |
411 | |
412 | /* drop old route */ | |
adf30907 | 413 | skb_dst_drop(skb); |
d8d1f30b | 414 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
415 | |
416 | /* Another hack: avoid icmp_send in ip_fragment */ | |
417 | skb->local_df = 1; | |
418 | ||
fc604767 | 419 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0); |
1da177e4 LT |
420 | |
421 | LeaveFunction(10); | |
422 | return NF_STOLEN; | |
423 | ||
424 | tx_error_icmp: | |
425 | dst_link_failure(skb); | |
426 | tx_error: | |
427 | kfree_skb(skb); | |
428 | LeaveFunction(10); | |
429 | return NF_STOLEN; | |
430 | } | |
431 | ||
b3cdd2a7 JV |
432 | #ifdef CONFIG_IP_VS_IPV6 |
433 | int | |
434 | ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
435 | struct ip_vs_protocol *pp) | |
436 | { | |
437 | struct rt6_info *rt; /* Route to the other host */ | |
438 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
439 | int mtu; | |
b3cdd2a7 JV |
440 | |
441 | EnterFunction(10); | |
442 | ||
e58b3442 DM |
443 | if (!(rt = __ip_vs_get_out_rt_v6(skb, NULL, &iph->daddr, NULL, 0, |
444 | IP_VS_RT_MODE_NON_LOCAL))) | |
b3cdd2a7 | 445 | goto tx_error_icmp; |
b3cdd2a7 JV |
446 | |
447 | /* MTU checking */ | |
d8d1f30b | 448 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 449 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
450 | if (!skb->dev) { |
451 | struct net *net = dev_net(skb_dst(skb)->dev); | |
452 | ||
453 | skb->dev = net->loopback_dev; | |
454 | } | |
3ffe533c | 455 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
cb59155f | 456 | dst_release(&rt->dst); |
1e3e238e | 457 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
b3cdd2a7 JV |
458 | goto tx_error; |
459 | } | |
460 | ||
461 | /* | |
462 | * Call ip_send_check because we are not sure it is called | |
463 | * after ip_defrag. Is copy-on-write needed? | |
464 | */ | |
465 | skb = skb_share_check(skb, GFP_ATOMIC); | |
466 | if (unlikely(skb == NULL)) { | |
d8d1f30b | 467 | dst_release(&rt->dst); |
b3cdd2a7 JV |
468 | return NF_STOLEN; |
469 | } | |
470 | ||
471 | /* drop old route */ | |
adf30907 | 472 | skb_dst_drop(skb); |
d8d1f30b | 473 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
474 | |
475 | /* Another hack: avoid icmp_send in ip_fragment */ | |
476 | skb->local_df = 1; | |
477 | ||
fc604767 | 478 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0); |
b3cdd2a7 JV |
479 | |
480 | LeaveFunction(10); | |
481 | return NF_STOLEN; | |
482 | ||
483 | tx_error_icmp: | |
484 | dst_link_failure(skb); | |
485 | tx_error: | |
486 | kfree_skb(skb); | |
487 | LeaveFunction(10); | |
488 | return NF_STOLEN; | |
489 | } | |
490 | #endif | |
1da177e4 LT |
491 | |
492 | /* | |
493 | * NAT transmitter (only for outside-to-inside nat forwarding) | |
494 | * Not used for related ICMP | |
495 | */ | |
496 | int | |
497 | ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
498 | struct ip_vs_protocol *pp) | |
499 | { | |
500 | struct rtable *rt; /* Route to the other host */ | |
501 | int mtu; | |
eddc9ec5 | 502 | struct iphdr *iph = ip_hdr(skb); |
fc604767 | 503 | int local; |
1da177e4 LT |
504 | |
505 | EnterFunction(10); | |
506 | ||
507 | /* check if it is a connection of no-client-port */ | |
508 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { | |
014d730d | 509 | __be16 _pt, *p; |
1da177e4 LT |
510 | p = skb_header_pointer(skb, iph->ihl*4, sizeof(_pt), &_pt); |
511 | if (p == NULL) | |
512 | goto tx_error; | |
513 | ip_vs_conn_fill_cport(cp, *p); | |
514 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); | |
515 | } | |
516 | ||
fc604767 | 517 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 CG |
518 | RT_TOS(iph->tos), |
519 | IP_VS_RT_MODE_LOCAL | | |
520 | IP_VS_RT_MODE_NON_LOCAL | | |
521 | IP_VS_RT_MODE_RDR))) | |
1da177e4 | 522 | goto tx_error_icmp; |
fc604767 JA |
523 | local = rt->rt_flags & RTCF_LOCAL; |
524 | /* | |
525 | * Avoid duplicate tuple in reply direction for NAT traffic | |
526 | * to local address when connection is sync-ed | |
527 | */ | |
528 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
529 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { | |
530 | enum ip_conntrack_info ctinfo; | |
531 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
532 | ||
533 | if (ct && !nf_ct_is_untracked(ct)) { | |
0d79641a JA |
534 | IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0, |
535 | "ip_vs_nat_xmit(): " | |
fc604767 JA |
536 | "stopping DNAT to local address"); |
537 | goto tx_error_put; | |
538 | } | |
539 | } | |
540 | #endif | |
541 | ||
542 | /* From world but DNAT to loopback address? */ | |
c7537967 DM |
543 | if (local && ipv4_is_loopback(rt->rt_dst) && |
544 | rt_is_input_route(skb_rtable(skb))) { | |
0d79641a | 545 | IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): " |
fc604767 JA |
546 | "stopping DNAT to loopback address"); |
547 | goto tx_error_put; | |
548 | } | |
1da177e4 LT |
549 | |
550 | /* MTU checking */ | |
d8d1f30b | 551 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
552 | if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF)) && |
553 | !skb_is_gso(skb)) { | |
1da177e4 | 554 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
0d79641a JA |
555 | IP_VS_DBG_RL_PKT(0, AF_INET, pp, skb, 0, |
556 | "ip_vs_nat_xmit(): frag needed for"); | |
fc604767 | 557 | goto tx_error_put; |
1da177e4 LT |
558 | } |
559 | ||
560 | /* copy-on-write the packet before mangling it */ | |
af1e1cf0 | 561 | if (!skb_make_writable(skb, sizeof(struct iphdr))) |
1da177e4 LT |
562 | goto tx_error_put; |
563 | ||
d8d1f30b | 564 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
1da177e4 LT |
565 | goto tx_error_put; |
566 | ||
1da177e4 | 567 | /* mangle the packet */ |
3db05fea | 568 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp)) |
fc604767 | 569 | goto tx_error_put; |
e7ade46a | 570 | ip_hdr(skb)->daddr = cp->daddr.ip; |
eddc9ec5 | 571 | ip_send_check(ip_hdr(skb)); |
1da177e4 | 572 | |
fc604767 JA |
573 | if (!local) { |
574 | /* drop old route */ | |
575 | skb_dst_drop(skb); | |
576 | skb_dst_set(skb, &rt->dst); | |
577 | } else { | |
578 | ip_rt_put(rt); | |
579 | /* | |
580 | * Some IPv4 replies get local address from routes, | |
581 | * not from iph, so while we DNAT after routing | |
582 | * we need this second input/output route. | |
583 | */ | |
584 | if (!__ip_vs_reroute_locally(skb)) | |
585 | goto tx_error; | |
586 | } | |
587 | ||
0d79641a | 588 | IP_VS_DBG_PKT(10, AF_INET, pp, skb, 0, "After DNAT"); |
1da177e4 LT |
589 | |
590 | /* FIXME: when application helper enlarges the packet and the length | |
591 | is larger than the MTU of outgoing device, there will be still | |
592 | MTU problem. */ | |
593 | ||
594 | /* Another hack: avoid icmp_send in ip_fragment */ | |
595 | skb->local_df = 1; | |
596 | ||
fc604767 | 597 | IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local); |
1da177e4 LT |
598 | |
599 | LeaveFunction(10); | |
600 | return NF_STOLEN; | |
601 | ||
602 | tx_error_icmp: | |
603 | dst_link_failure(skb); | |
604 | tx_error: | |
1da177e4 | 605 | kfree_skb(skb); |
f4bc17cd | 606 | LeaveFunction(10); |
1da177e4 LT |
607 | return NF_STOLEN; |
608 | tx_error_put: | |
609 | ip_rt_put(rt); | |
610 | goto tx_error; | |
611 | } | |
612 | ||
b3cdd2a7 JV |
613 | #ifdef CONFIG_IP_VS_IPV6 |
614 | int | |
615 | ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
616 | struct ip_vs_protocol *pp) | |
617 | { | |
618 | struct rt6_info *rt; /* Route to the other host */ | |
619 | int mtu; | |
fc604767 | 620 | int local; |
b3cdd2a7 JV |
621 | |
622 | EnterFunction(10); | |
623 | ||
624 | /* check if it is a connection of no-client-port */ | |
625 | if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) { | |
626 | __be16 _pt, *p; | |
627 | p = skb_header_pointer(skb, sizeof(struct ipv6hdr), | |
628 | sizeof(_pt), &_pt); | |
629 | if (p == NULL) | |
630 | goto tx_error; | |
631 | ip_vs_conn_fill_cport(cp, *p); | |
632 | IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p)); | |
633 | } | |
634 | ||
fc604767 | 635 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
e58b3442 DM |
636 | 0, (IP_VS_RT_MODE_LOCAL | |
637 | IP_VS_RT_MODE_NON_LOCAL | | |
638 | IP_VS_RT_MODE_RDR)))) | |
b3cdd2a7 | 639 | goto tx_error_icmp; |
fc604767 JA |
640 | local = __ip_vs_is_local_route6(rt); |
641 | /* | |
642 | * Avoid duplicate tuple in reply direction for NAT traffic | |
643 | * to local address when connection is sync-ed | |
644 | */ | |
645 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
646 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { | |
647 | enum ip_conntrack_info ctinfo; | |
648 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
649 | ||
650 | if (ct && !nf_ct_is_untracked(ct)) { | |
0d79641a | 651 | IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0, |
fc604767 JA |
652 | "ip_vs_nat_xmit_v6(): " |
653 | "stopping DNAT to local address"); | |
654 | goto tx_error_put; | |
655 | } | |
656 | } | |
657 | #endif | |
658 | ||
659 | /* From world but DNAT to loopback address? */ | |
660 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && | |
661 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { | |
0d79641a | 662 | IP_VS_DBG_RL_PKT(1, AF_INET6, pp, skb, 0, |
fc604767 JA |
663 | "ip_vs_nat_xmit_v6(): " |
664 | "stopping DNAT to loopback address"); | |
665 | goto tx_error_put; | |
666 | } | |
b3cdd2a7 JV |
667 | |
668 | /* MTU checking */ | |
d8d1f30b | 669 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 670 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
671 | if (!skb->dev) { |
672 | struct net *net = dev_net(skb_dst(skb)->dev); | |
673 | ||
674 | skb->dev = net->loopback_dev; | |
675 | } | |
3ffe533c | 676 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
0d79641a | 677 | IP_VS_DBG_RL_PKT(0, AF_INET6, pp, skb, 0, |
b3cdd2a7 | 678 | "ip_vs_nat_xmit_v6(): frag needed for"); |
fc604767 | 679 | goto tx_error_put; |
b3cdd2a7 JV |
680 | } |
681 | ||
682 | /* copy-on-write the packet before mangling it */ | |
683 | if (!skb_make_writable(skb, sizeof(struct ipv6hdr))) | |
684 | goto tx_error_put; | |
685 | ||
d8d1f30b | 686 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
b3cdd2a7 JV |
687 | goto tx_error_put; |
688 | ||
b3cdd2a7 JV |
689 | /* mangle the packet */ |
690 | if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp)) | |
691 | goto tx_error; | |
fc604767 JA |
692 | ipv6_addr_copy(&ipv6_hdr(skb)->daddr, &cp->daddr.in6); |
693 | ||
694 | if (!local || !skb->dev) { | |
695 | /* drop the old route when skb is not shared */ | |
696 | skb_dst_drop(skb); | |
697 | skb_dst_set(skb, &rt->dst); | |
698 | } else { | |
699 | /* destined to loopback, do we need to change route? */ | |
700 | dst_release(&rt->dst); | |
701 | } | |
b3cdd2a7 | 702 | |
0d79641a | 703 | IP_VS_DBG_PKT(10, AF_INET6, pp, skb, 0, "After DNAT"); |
b3cdd2a7 JV |
704 | |
705 | /* FIXME: when application helper enlarges the packet and the length | |
706 | is larger than the MTU of outgoing device, there will be still | |
707 | MTU problem. */ | |
708 | ||
709 | /* Another hack: avoid icmp_send in ip_fragment */ | |
710 | skb->local_df = 1; | |
711 | ||
fc604767 | 712 | IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local); |
b3cdd2a7 JV |
713 | |
714 | LeaveFunction(10); | |
715 | return NF_STOLEN; | |
716 | ||
717 | tx_error_icmp: | |
718 | dst_link_failure(skb); | |
719 | tx_error: | |
720 | LeaveFunction(10); | |
721 | kfree_skb(skb); | |
722 | return NF_STOLEN; | |
723 | tx_error_put: | |
d8d1f30b | 724 | dst_release(&rt->dst); |
b3cdd2a7 JV |
725 | goto tx_error; |
726 | } | |
727 | #endif | |
728 | ||
1da177e4 LT |
729 | |
730 | /* | |
731 | * IP Tunneling transmitter | |
732 | * | |
733 | * This function encapsulates the packet in a new IP packet, its | |
734 | * destination will be set to cp->daddr. Most code of this function | |
735 | * is taken from ipip.c. | |
736 | * | |
737 | * It is used in VS/TUN cluster. The load balancer selects a real | |
738 | * server from a cluster based on a scheduling algorithm, | |
739 | * encapsulates the request packet and forwards it to the selected | |
740 | * server. For example, all real servers are configured with | |
741 | * "ifconfig tunl0 <Virtual IP Address> up". When the server receives | |
742 | * the encapsulated packet, it will decapsulate the packet, processe | |
743 | * the request and return the response packets directly to the client | |
744 | * without passing the load balancer. This can greatly increase the | |
745 | * scalability of virtual server. | |
746 | * | |
747 | * Used for ANY protocol | |
748 | */ | |
749 | int | |
750 | ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
751 | struct ip_vs_protocol *pp) | |
752 | { | |
753 | struct rtable *rt; /* Route to the other host */ | |
754 | struct net_device *tdev; /* Device to other host */ | |
eddc9ec5 | 755 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 | 756 | u8 tos = old_iph->tos; |
76ab608d | 757 | __be16 df = old_iph->frag_off; |
1da177e4 | 758 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 759 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 760 | int mtu; |
f4bc17cd | 761 | int ret; |
1da177e4 LT |
762 | |
763 | EnterFunction(10); | |
764 | ||
fc604767 | 765 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 CG |
766 | RT_TOS(tos), IP_VS_RT_MODE_LOCAL | |
767 | IP_VS_RT_MODE_NON_LOCAL))) | |
1da177e4 | 768 | goto tx_error_icmp; |
fc604767 JA |
769 | if (rt->rt_flags & RTCF_LOCAL) { |
770 | ip_rt_put(rt); | |
771 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); | |
772 | } | |
1da177e4 | 773 | |
d8d1f30b | 774 | tdev = rt->dst.dev; |
1da177e4 | 775 | |
d8d1f30b | 776 | mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); |
1da177e4 | 777 | if (mtu < 68) { |
1e3e238e | 778 | IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__); |
fc604767 | 779 | goto tx_error_put; |
1da177e4 | 780 | } |
adf30907 ED |
781 | if (skb_dst(skb)) |
782 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 | 783 | |
4412ec49 | 784 | df |= (old_iph->frag_off & htons(IP_DF)); |
1da177e4 | 785 | |
8f1b03a4 SH |
786 | if ((old_iph->frag_off & htons(IP_DF) && |
787 | mtu < ntohs(old_iph->tot_len) && !skb_is_gso(skb))) { | |
1da177e4 | 788 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
1e3e238e | 789 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 790 | goto tx_error_put; |
1da177e4 LT |
791 | } |
792 | ||
793 | /* | |
794 | * Okay, now see if we can stuff it in the buffer as-is. | |
795 | */ | |
796 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr); | |
797 | ||
798 | if (skb_headroom(skb) < max_headroom | |
799 | || skb_cloned(skb) || skb_shared(skb)) { | |
800 | struct sk_buff *new_skb = | |
801 | skb_realloc_headroom(skb, max_headroom); | |
802 | if (!new_skb) { | |
803 | ip_rt_put(rt); | |
804 | kfree_skb(skb); | |
1e3e238e | 805 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
1da177e4 LT |
806 | return NF_STOLEN; |
807 | } | |
808 | kfree_skb(skb); | |
809 | skb = new_skb; | |
eddc9ec5 | 810 | old_iph = ip_hdr(skb); |
1da177e4 LT |
811 | } |
812 | ||
714f095f | 813 | skb->transport_header = skb->network_header; |
1da177e4 LT |
814 | |
815 | /* fix old IP header checksum */ | |
816 | ip_send_check(old_iph); | |
817 | ||
e2d1bca7 ACM |
818 | skb_push(skb, sizeof(struct iphdr)); |
819 | skb_reset_network_header(skb); | |
1da177e4 LT |
820 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
821 | ||
822 | /* drop old route */ | |
adf30907 | 823 | skb_dst_drop(skb); |
d8d1f30b | 824 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
825 | |
826 | /* | |
827 | * Push down and install the IPIP header. | |
828 | */ | |
eddc9ec5 | 829 | iph = ip_hdr(skb); |
1da177e4 LT |
830 | iph->version = 4; |
831 | iph->ihl = sizeof(struct iphdr)>>2; | |
832 | iph->frag_off = df; | |
833 | iph->protocol = IPPROTO_IPIP; | |
834 | iph->tos = tos; | |
835 | iph->daddr = rt->rt_dst; | |
836 | iph->saddr = rt->rt_src; | |
837 | iph->ttl = old_iph->ttl; | |
d8d1f30b | 838 | ip_select_ident(iph, &rt->dst, NULL); |
1da177e4 LT |
839 | |
840 | /* Another hack: avoid icmp_send in ip_fragment */ | |
841 | skb->local_df = 1; | |
842 | ||
f4bc17cd JA |
843 | ret = IP_VS_XMIT_TUNNEL(skb, cp); |
844 | if (ret == NF_ACCEPT) | |
845 | ip_local_out(skb); | |
846 | else if (ret == NF_DROP) | |
847 | kfree_skb(skb); | |
1da177e4 LT |
848 | |
849 | LeaveFunction(10); | |
850 | ||
851 | return NF_STOLEN; | |
852 | ||
853 | tx_error_icmp: | |
854 | dst_link_failure(skb); | |
855 | tx_error: | |
856 | kfree_skb(skb); | |
857 | LeaveFunction(10); | |
858 | return NF_STOLEN; | |
fc604767 JA |
859 | tx_error_put: |
860 | ip_rt_put(rt); | |
861 | goto tx_error; | |
1da177e4 LT |
862 | } |
863 | ||
b3cdd2a7 JV |
864 | #ifdef CONFIG_IP_VS_IPV6 |
865 | int | |
866 | ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
867 | struct ip_vs_protocol *pp) | |
868 | { | |
869 | struct rt6_info *rt; /* Route to the other host */ | |
714f095f | 870 | struct in6_addr saddr; /* Source for tunnel */ |
b3cdd2a7 JV |
871 | struct net_device *tdev; /* Device to other host */ |
872 | struct ipv6hdr *old_iph = ipv6_hdr(skb); | |
b3cdd2a7 JV |
873 | struct ipv6hdr *iph; /* Our new IP header */ |
874 | unsigned int max_headroom; /* The extra header space needed */ | |
875 | int mtu; | |
f4bc17cd | 876 | int ret; |
b3cdd2a7 JV |
877 | |
878 | EnterFunction(10); | |
879 | ||
fc604767 | 880 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, |
e58b3442 DM |
881 | &saddr, 1, (IP_VS_RT_MODE_LOCAL | |
882 | IP_VS_RT_MODE_NON_LOCAL)))) | |
b3cdd2a7 | 883 | goto tx_error_icmp; |
fc604767 JA |
884 | if (__ip_vs_is_local_route6(rt)) { |
885 | dst_release(&rt->dst); | |
886 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1); | |
887 | } | |
b3cdd2a7 | 888 | |
d8d1f30b | 889 | tdev = rt->dst.dev; |
b3cdd2a7 | 890 | |
d8d1f30b | 891 | mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr); |
714f095f | 892 | if (mtu < IPV6_MIN_MTU) { |
714f095f HS |
893 | IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__, |
894 | IPV6_MIN_MTU); | |
fc604767 | 895 | goto tx_error_put; |
b3cdd2a7 | 896 | } |
adf30907 ED |
897 | if (skb_dst(skb)) |
898 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
b3cdd2a7 | 899 | |
8f1b03a4 SH |
900 | if (mtu < ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr) && |
901 | !skb_is_gso(skb)) { | |
cb59155f JA |
902 | if (!skb->dev) { |
903 | struct net *net = dev_net(skb_dst(skb)->dev); | |
904 | ||
905 | skb->dev = net->loopback_dev; | |
906 | } | |
3ffe533c | 907 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1e3e238e | 908 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 909 | goto tx_error_put; |
b3cdd2a7 JV |
910 | } |
911 | ||
912 | /* | |
913 | * Okay, now see if we can stuff it in the buffer as-is. | |
914 | */ | |
915 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr); | |
916 | ||
917 | if (skb_headroom(skb) < max_headroom | |
918 | || skb_cloned(skb) || skb_shared(skb)) { | |
919 | struct sk_buff *new_skb = | |
920 | skb_realloc_headroom(skb, max_headroom); | |
921 | if (!new_skb) { | |
d8d1f30b | 922 | dst_release(&rt->dst); |
b3cdd2a7 | 923 | kfree_skb(skb); |
1e3e238e | 924 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
b3cdd2a7 JV |
925 | return NF_STOLEN; |
926 | } | |
927 | kfree_skb(skb); | |
928 | skb = new_skb; | |
929 | old_iph = ipv6_hdr(skb); | |
930 | } | |
931 | ||
714f095f | 932 | skb->transport_header = skb->network_header; |
b3cdd2a7 JV |
933 | |
934 | skb_push(skb, sizeof(struct ipv6hdr)); | |
935 | skb_reset_network_header(skb); | |
936 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
937 | ||
938 | /* drop old route */ | |
adf30907 | 939 | skb_dst_drop(skb); |
d8d1f30b | 940 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
941 | |
942 | /* | |
943 | * Push down and install the IPIP header. | |
944 | */ | |
945 | iph = ipv6_hdr(skb); | |
946 | iph->version = 6; | |
947 | iph->nexthdr = IPPROTO_IPV6; | |
b7b45f47 HH |
948 | iph->payload_len = old_iph->payload_len; |
949 | be16_add_cpu(&iph->payload_len, sizeof(*old_iph)); | |
b3cdd2a7 JV |
950 | iph->priority = old_iph->priority; |
951 | memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl)); | |
714f095f HS |
952 | ipv6_addr_copy(&iph->daddr, &cp->daddr.in6); |
953 | ipv6_addr_copy(&iph->saddr, &saddr); | |
b3cdd2a7 JV |
954 | iph->hop_limit = old_iph->hop_limit; |
955 | ||
956 | /* Another hack: avoid icmp_send in ip_fragment */ | |
957 | skb->local_df = 1; | |
958 | ||
f4bc17cd JA |
959 | ret = IP_VS_XMIT_TUNNEL(skb, cp); |
960 | if (ret == NF_ACCEPT) | |
961 | ip6_local_out(skb); | |
962 | else if (ret == NF_DROP) | |
963 | kfree_skb(skb); | |
b3cdd2a7 JV |
964 | |
965 | LeaveFunction(10); | |
966 | ||
967 | return NF_STOLEN; | |
968 | ||
969 | tx_error_icmp: | |
970 | dst_link_failure(skb); | |
971 | tx_error: | |
972 | kfree_skb(skb); | |
973 | LeaveFunction(10); | |
974 | return NF_STOLEN; | |
fc604767 JA |
975 | tx_error_put: |
976 | dst_release(&rt->dst); | |
977 | goto tx_error; | |
b3cdd2a7 JV |
978 | } |
979 | #endif | |
980 | ||
1da177e4 LT |
981 | |
982 | /* | |
983 | * Direct Routing transmitter | |
984 | * Used for ANY protocol | |
985 | */ | |
986 | int | |
987 | ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
988 | struct ip_vs_protocol *pp) | |
989 | { | |
990 | struct rtable *rt; /* Route to the other host */ | |
eddc9ec5 | 991 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
992 | int mtu; |
993 | ||
994 | EnterFunction(10); | |
995 | ||
fc604767 | 996 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 CG |
997 | RT_TOS(iph->tos), |
998 | IP_VS_RT_MODE_LOCAL | | |
999 | IP_VS_RT_MODE_NON_LOCAL))) | |
1da177e4 | 1000 | goto tx_error_icmp; |
fc604767 JA |
1001 | if (rt->rt_flags & RTCF_LOCAL) { |
1002 | ip_rt_put(rt); | |
1003 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 1); | |
1004 | } | |
1da177e4 LT |
1005 | |
1006 | /* MTU checking */ | |
d8d1f30b | 1007 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
1008 | if ((iph->frag_off & htons(IP_DF)) && skb->len > mtu && |
1009 | !skb_is_gso(skb)) { | |
1da177e4 LT |
1010 | icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu)); |
1011 | ip_rt_put(rt); | |
1e3e238e | 1012 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
1da177e4 LT |
1013 | goto tx_error; |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Call ip_send_check because we are not sure it is called | |
1018 | * after ip_defrag. Is copy-on-write needed? | |
1019 | */ | |
1020 | if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) { | |
1021 | ip_rt_put(rt); | |
1022 | return NF_STOLEN; | |
1023 | } | |
eddc9ec5 | 1024 | ip_send_check(ip_hdr(skb)); |
1da177e4 LT |
1025 | |
1026 | /* drop old route */ | |
adf30907 | 1027 | skb_dst_drop(skb); |
d8d1f30b | 1028 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1029 | |
1030 | /* Another hack: avoid icmp_send in ip_fragment */ | |
1031 | skb->local_df = 1; | |
1032 | ||
fc604767 | 1033 | IP_VS_XMIT(NFPROTO_IPV4, skb, cp, 0); |
1da177e4 LT |
1034 | |
1035 | LeaveFunction(10); | |
1036 | return NF_STOLEN; | |
1037 | ||
1038 | tx_error_icmp: | |
1039 | dst_link_failure(skb); | |
1040 | tx_error: | |
1041 | kfree_skb(skb); | |
1042 | LeaveFunction(10); | |
1043 | return NF_STOLEN; | |
1044 | } | |
1045 | ||
b3cdd2a7 JV |
1046 | #ifdef CONFIG_IP_VS_IPV6 |
1047 | int | |
1048 | ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
1049 | struct ip_vs_protocol *pp) | |
1050 | { | |
1051 | struct rt6_info *rt; /* Route to the other host */ | |
1052 | int mtu; | |
1053 | ||
1054 | EnterFunction(10); | |
1055 | ||
fc604767 | 1056 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
e58b3442 DM |
1057 | 0, (IP_VS_RT_MODE_LOCAL | |
1058 | IP_VS_RT_MODE_NON_LOCAL)))) | |
b3cdd2a7 | 1059 | goto tx_error_icmp; |
fc604767 JA |
1060 | if (__ip_vs_is_local_route6(rt)) { |
1061 | dst_release(&rt->dst); | |
1062 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 1); | |
1063 | } | |
b3cdd2a7 JV |
1064 | |
1065 | /* MTU checking */ | |
d8d1f30b | 1066 | mtu = dst_mtu(&rt->dst); |
b3cdd2a7 | 1067 | if (skb->len > mtu) { |
cb59155f JA |
1068 | if (!skb->dev) { |
1069 | struct net *net = dev_net(skb_dst(skb)->dev); | |
1070 | ||
1071 | skb->dev = net->loopback_dev; | |
1072 | } | |
3ffe533c | 1073 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
d8d1f30b | 1074 | dst_release(&rt->dst); |
1e3e238e | 1075 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
b3cdd2a7 JV |
1076 | goto tx_error; |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * Call ip_send_check because we are not sure it is called | |
1081 | * after ip_defrag. Is copy-on-write needed? | |
1082 | */ | |
1083 | skb = skb_share_check(skb, GFP_ATOMIC); | |
1084 | if (unlikely(skb == NULL)) { | |
d8d1f30b | 1085 | dst_release(&rt->dst); |
b3cdd2a7 JV |
1086 | return NF_STOLEN; |
1087 | } | |
1088 | ||
1089 | /* drop old route */ | |
adf30907 | 1090 | skb_dst_drop(skb); |
d8d1f30b | 1091 | skb_dst_set(skb, &rt->dst); |
b3cdd2a7 JV |
1092 | |
1093 | /* Another hack: avoid icmp_send in ip_fragment */ | |
1094 | skb->local_df = 1; | |
1095 | ||
fc604767 | 1096 | IP_VS_XMIT(NFPROTO_IPV6, skb, cp, 0); |
b3cdd2a7 JV |
1097 | |
1098 | LeaveFunction(10); | |
1099 | return NF_STOLEN; | |
1100 | ||
1101 | tx_error_icmp: | |
1102 | dst_link_failure(skb); | |
1103 | tx_error: | |
1104 | kfree_skb(skb); | |
1105 | LeaveFunction(10); | |
1106 | return NF_STOLEN; | |
1107 | } | |
1108 | #endif | |
1109 | ||
1da177e4 LT |
1110 | |
1111 | /* | |
1112 | * ICMP packet transmitter | |
1113 | * called by the ip_vs_in_icmp | |
1114 | */ | |
1115 | int | |
1116 | ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, | |
1117 | struct ip_vs_protocol *pp, int offset) | |
1118 | { | |
1119 | struct rtable *rt; /* Route to the other host */ | |
1120 | int mtu; | |
1121 | int rc; | |
fc604767 | 1122 | int local; |
1da177e4 LT |
1123 | |
1124 | EnterFunction(10); | |
1125 | ||
1126 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be | |
1127 | forwarded directly here, because there is no need to | |
1128 | translate address/port back */ | |
1129 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { | |
1130 | if (cp->packet_xmit) | |
1131 | rc = cp->packet_xmit(skb, cp, pp); | |
1132 | else | |
1133 | rc = NF_ACCEPT; | |
1134 | /* do not touch skb anymore */ | |
1135 | atomic_inc(&cp->in_pkts); | |
1da177e4 LT |
1136 | goto out; |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * mangle and send the packet here (only for VS/NAT) | |
1141 | */ | |
1142 | ||
fc604767 | 1143 | if (!(rt = __ip_vs_get_out_rt(skb, cp->dest, cp->daddr.ip, |
17a8f8e3 CG |
1144 | RT_TOS(ip_hdr(skb)->tos), |
1145 | IP_VS_RT_MODE_LOCAL | | |
1146 | IP_VS_RT_MODE_NON_LOCAL | | |
1147 | IP_VS_RT_MODE_RDR))) | |
1da177e4 | 1148 | goto tx_error_icmp; |
fc604767 JA |
1149 | local = rt->rt_flags & RTCF_LOCAL; |
1150 | ||
1151 | /* | |
1152 | * Avoid duplicate tuple in reply direction for NAT traffic | |
1153 | * to local address when connection is sync-ed | |
1154 | */ | |
1155 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
1156 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { | |
1157 | enum ip_conntrack_info ctinfo; | |
1158 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
1159 | ||
1160 | if (ct && !nf_ct_is_untracked(ct)) { | |
1161 | IP_VS_DBG(10, "%s(): " | |
1162 | "stopping DNAT to local address %pI4\n", | |
1163 | __func__, &cp->daddr.ip); | |
1164 | goto tx_error_put; | |
1165 | } | |
1166 | } | |
1167 | #endif | |
1168 | ||
1169 | /* From world but DNAT to loopback address? */ | |
c7537967 DM |
1170 | if (local && ipv4_is_loopback(rt->rt_dst) && |
1171 | rt_is_input_route(skb_rtable(skb))) { | |
fc604767 JA |
1172 | IP_VS_DBG(1, "%s(): " |
1173 | "stopping DNAT to loopback %pI4\n", | |
1174 | __func__, &cp->daddr.ip); | |
1175 | goto tx_error_put; | |
1176 | } | |
1da177e4 LT |
1177 | |
1178 | /* MTU checking */ | |
d8d1f30b | 1179 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 SH |
1180 | if ((skb->len > mtu) && (ip_hdr(skb)->frag_off & htons(IP_DF)) && |
1181 | !skb_is_gso(skb)) { | |
1da177e4 | 1182 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
1e3e238e | 1183 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 1184 | goto tx_error_put; |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | /* copy-on-write the packet before mangling it */ | |
af1e1cf0 | 1188 | if (!skb_make_writable(skb, offset)) |
1da177e4 LT |
1189 | goto tx_error_put; |
1190 | ||
d8d1f30b | 1191 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
1da177e4 LT |
1192 | goto tx_error_put; |
1193 | ||
1da177e4 LT |
1194 | ip_vs_nat_icmp(skb, pp, cp, 0); |
1195 | ||
fc604767 JA |
1196 | if (!local) { |
1197 | /* drop the old route when skb is not shared */ | |
1198 | skb_dst_drop(skb); | |
1199 | skb_dst_set(skb, &rt->dst); | |
1200 | } else { | |
1201 | ip_rt_put(rt); | |
1202 | /* | |
1203 | * Some IPv4 replies get local address from routes, | |
1204 | * not from iph, so while we DNAT after routing | |
1205 | * we need this second input/output route. | |
1206 | */ | |
1207 | if (!__ip_vs_reroute_locally(skb)) | |
1208 | goto tx_error; | |
1209 | } | |
1210 | ||
1da177e4 LT |
1211 | /* Another hack: avoid icmp_send in ip_fragment */ |
1212 | skb->local_df = 1; | |
1213 | ||
fc604767 | 1214 | IP_VS_XMIT_NAT(NFPROTO_IPV4, skb, cp, local); |
1da177e4 LT |
1215 | |
1216 | rc = NF_STOLEN; | |
1217 | goto out; | |
1218 | ||
1219 | tx_error_icmp: | |
1220 | dst_link_failure(skb); | |
1221 | tx_error: | |
1222 | dev_kfree_skb(skb); | |
1223 | rc = NF_STOLEN; | |
1224 | out: | |
1225 | LeaveFunction(10); | |
1226 | return rc; | |
1227 | tx_error_put: | |
1228 | ip_rt_put(rt); | |
1229 | goto tx_error; | |
1230 | } | |
b3cdd2a7 JV |
1231 | |
1232 | #ifdef CONFIG_IP_VS_IPV6 | |
1233 | int | |
1234 | ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, | |
1235 | struct ip_vs_protocol *pp, int offset) | |
1236 | { | |
1237 | struct rt6_info *rt; /* Route to the other host */ | |
1238 | int mtu; | |
1239 | int rc; | |
fc604767 | 1240 | int local; |
b3cdd2a7 JV |
1241 | |
1242 | EnterFunction(10); | |
1243 | ||
1244 | /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be | |
1245 | forwarded directly here, because there is no need to | |
1246 | translate address/port back */ | |
1247 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) { | |
1248 | if (cp->packet_xmit) | |
1249 | rc = cp->packet_xmit(skb, cp, pp); | |
1250 | else | |
1251 | rc = NF_ACCEPT; | |
1252 | /* do not touch skb anymore */ | |
1253 | atomic_inc(&cp->in_pkts); | |
1254 | goto out; | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * mangle and send the packet here (only for VS/NAT) | |
1259 | */ | |
1260 | ||
fc604767 | 1261 | if (!(rt = __ip_vs_get_out_rt_v6(skb, cp->dest, &cp->daddr.in6, NULL, |
e58b3442 DM |
1262 | 0, (IP_VS_RT_MODE_LOCAL | |
1263 | IP_VS_RT_MODE_NON_LOCAL | | |
1264 | IP_VS_RT_MODE_RDR)))) | |
b3cdd2a7 JV |
1265 | goto tx_error_icmp; |
1266 | ||
fc604767 JA |
1267 | local = __ip_vs_is_local_route6(rt); |
1268 | /* | |
1269 | * Avoid duplicate tuple in reply direction for NAT traffic | |
1270 | * to local address when connection is sync-ed | |
1271 | */ | |
1272 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
1273 | if (cp->flags & IP_VS_CONN_F_SYNC && local) { | |
1274 | enum ip_conntrack_info ctinfo; | |
1275 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
1276 | ||
1277 | if (ct && !nf_ct_is_untracked(ct)) { | |
1278 | IP_VS_DBG(10, "%s(): " | |
1279 | "stopping DNAT to local address %pI6\n", | |
1280 | __func__, &cp->daddr.in6); | |
1281 | goto tx_error_put; | |
1282 | } | |
1283 | } | |
1284 | #endif | |
1285 | ||
1286 | /* From world but DNAT to loopback address? */ | |
1287 | if (local && skb->dev && !(skb->dev->flags & IFF_LOOPBACK) && | |
1288 | ipv6_addr_type(&rt->rt6i_dst.addr) & IPV6_ADDR_LOOPBACK) { | |
1289 | IP_VS_DBG(1, "%s(): " | |
1290 | "stopping DNAT to loopback %pI6\n", | |
1291 | __func__, &cp->daddr.in6); | |
1292 | goto tx_error_put; | |
1293 | } | |
1294 | ||
b3cdd2a7 | 1295 | /* MTU checking */ |
d8d1f30b | 1296 | mtu = dst_mtu(&rt->dst); |
8f1b03a4 | 1297 | if (skb->len > mtu && !skb_is_gso(skb)) { |
cb59155f JA |
1298 | if (!skb->dev) { |
1299 | struct net *net = dev_net(skb_dst(skb)->dev); | |
1300 | ||
1301 | skb->dev = net->loopback_dev; | |
1302 | } | |
3ffe533c | 1303 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1e3e238e | 1304 | IP_VS_DBG_RL("%s(): frag needed\n", __func__); |
fc604767 | 1305 | goto tx_error_put; |
b3cdd2a7 JV |
1306 | } |
1307 | ||
1308 | /* copy-on-write the packet before mangling it */ | |
1309 | if (!skb_make_writable(skb, offset)) | |
1310 | goto tx_error_put; | |
1311 | ||
d8d1f30b | 1312 | if (skb_cow(skb, rt->dst.dev->hard_header_len)) |
b3cdd2a7 JV |
1313 | goto tx_error_put; |
1314 | ||
b3cdd2a7 JV |
1315 | ip_vs_nat_icmp_v6(skb, pp, cp, 0); |
1316 | ||
fc604767 JA |
1317 | if (!local || !skb->dev) { |
1318 | /* drop the old route when skb is not shared */ | |
1319 | skb_dst_drop(skb); | |
1320 | skb_dst_set(skb, &rt->dst); | |
1321 | } else { | |
1322 | /* destined to loopback, do we need to change route? */ | |
1323 | dst_release(&rt->dst); | |
1324 | } | |
1325 | ||
b3cdd2a7 JV |
1326 | /* Another hack: avoid icmp_send in ip_fragment */ |
1327 | skb->local_df = 1; | |
1328 | ||
fc604767 | 1329 | IP_VS_XMIT_NAT(NFPROTO_IPV6, skb, cp, local); |
b3cdd2a7 JV |
1330 | |
1331 | rc = NF_STOLEN; | |
1332 | goto out; | |
1333 | ||
1334 | tx_error_icmp: | |
1335 | dst_link_failure(skb); | |
1336 | tx_error: | |
1337 | dev_kfree_skb(skb); | |
1338 | rc = NF_STOLEN; | |
1339 | out: | |
1340 | LeaveFunction(10); | |
1341 | return rc; | |
1342 | tx_error_put: | |
d8d1f30b | 1343 | dst_release(&rt->dst); |
b3cdd2a7 JV |
1344 | goto tx_error; |
1345 | } | |
1346 | #endif |