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[net-next-2.6.git] / net / netfilter / ipvs / ip_vs_xmit.c
CommitLineData
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 *
14 */
15
16#include <linux/kernel.h>
1da177e4 17#include <linux/tcp.h> /* for tcphdr */
c439cb2e 18#include <net/ip.h>
1da177e4
LT		 19#include <net/tcp.h> /* for csum_tcpudp_magic */
20#include <net/udp.h>
21#include <net/icmp.h> /* for icmp_send */
22#include <net/route.h> /* for ip_route_output */
38cdcc9a
JV		 23#include <net/ipv6.h>
24#include <net/ip6_route.h>
25#include <linux/icmpv6.h>
1da177e4
LT		 26#include <linux/netfilter.h>
27#include <linux/netfilter_ipv4.h>
28
29#include <net/ip_vs.h>
30
31
32/*
33 * Destination cache to speed up outgoing route lookup
34 */
35static inline void
36__ip_vs_dst_set(struct ip_vs_dest *dest, u32 rtos, struct dst_entry *dst)
37{
38 struct dst_entry *old_dst;
39
40 old_dst = dest->dst_cache;
41 dest->dst_cache = dst;
42 dest->dst_rtos = rtos;
43 dst_release(old_dst);
44}
45
46static inline struct dst_entry *
47__ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos, u32 cookie)
48{
49 struct dst_entry *dst = dest->dst_cache;
50
51 if (!dst)
52 return NULL;
38cdcc9a
JV		 53 if ((dst->obsolete
54 || (dest->af == AF_INET && rtos != dest->dst_rtos)) &&
1da177e4
LT		 55 dst->ops->check(dst, cookie) == NULL) {
56 dest->dst_cache = NULL;
57 dst_release(dst);
58 return NULL;
59 }
60 dst_hold(dst);
61 return dst;
62}
63
ad1b30b1 64static struct rtable *
1da177e4
LT		 65__ip_vs_get_out_rt(struct ip_vs_conn *cp, u32 rtos)
66{
67 struct rtable *rt; /* Route to the other host */
68 struct ip_vs_dest *dest = cp->dest;
69
70 if (dest) {
71 spin_lock(&dest->dst_lock);
72 if (!(rt = (struct rtable *)
73 __ip_vs_dst_check(dest, rtos, 0))) {
74 struct flowi fl = {
75 .oif = 0,
76 .nl_u = {
77 .ip4_u = {
e7ade46a 78 .daddr = dest->addr.ip,
1da177e4
LT		 79 .saddr = 0,
80 .tos = rtos, } },
81 };
82
f206351a 83 if (ip_route_output_key(&init_net, &rt, &fl)) {
1da177e4 84 spin_unlock(&dest->dst_lock);
14d5e834
HH		 85 IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n",
86 &dest->addr.ip);
1da177e4
LT		 87 return NULL;
88 }
89 __ip_vs_dst_set(dest, rtos, dst_clone(&rt->u.dst));
14d5e834
HH		 90 IP_VS_DBG(10, "new dst %pI4, refcnt=%d, rtos=%X\n",
91 &dest->addr.ip,
1da177e4
LT		 92 atomic_read(&rt->u.dst.__refcnt), rtos);
93 }
94 spin_unlock(&dest->dst_lock);
95 } else {
96 struct flowi fl = {
97 .oif = 0,
98 .nl_u = {
99 .ip4_u = {
e7ade46a 100 .daddr = cp->daddr.ip,
1da177e4
LT		 101 .saddr = 0,
102 .tos = rtos, } },
103 };
104
f206351a 105 if (ip_route_output_key(&init_net, &rt, &fl)) {
14d5e834
HH		 106 IP_VS_DBG_RL("ip_route_output error, dest: %pI4\n",
107 &cp->daddr.ip);
1da177e4
LT		 108 return NULL;
109 }
110 }
111
112 return rt;
113}
114
38cdcc9a
JV		 115#ifdef CONFIG_IP_VS_IPV6
116static struct rt6_info *
117__ip_vs_get_out_rt_v6(struct ip_vs_conn *cp)
118{
119 struct rt6_info *rt; /* Route to the other host */
120 struct ip_vs_dest *dest = cp->dest;
121
122 if (dest) {
123 spin_lock(&dest->dst_lock);
124 rt = (struct rt6_info *)__ip_vs_dst_check(dest, 0, 0);
125 if (!rt) {
126 struct flowi fl = {
127 .oif = 0,
128 .nl_u = {
129 .ip6_u = {
130 .daddr = dest->addr.in6,
131 .saddr = {
132 .s6_addr32 =
133 { 0, 0, 0, 0 },
134 },
135 },
136 },
137 };
138
139 rt = (struct rt6_info *)ip6_route_output(&init_net,
140 NULL, &fl);
141 if (!rt) {
142 spin_unlock(&dest->dst_lock);
5b095d98 143 IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n",
38ff4fa4 144 &dest->addr.in6);
38cdcc9a
JV		 145 return NULL;
146 }
147 __ip_vs_dst_set(dest, 0, dst_clone(&rt->u.dst));
5b095d98 148 IP_VS_DBG(10, "new dst %pI6, refcnt=%d\n",
38ff4fa4 149 &dest->addr.in6,
38cdcc9a
JV		 150 atomic_read(&rt->u.dst.__refcnt));
151 }
152 spin_unlock(&dest->dst_lock);
153 } else {
154 struct flowi fl = {
155 .oif = 0,
156 .nl_u = {
157 .ip6_u = {
158 .daddr = cp->daddr.in6,
159 .saddr = {
160 .s6_addr32 = { 0, 0, 0, 0 },
161 },
162 },
163 },
164 };
165
166 rt = (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
167 if (!rt) {
5b095d98 168 IP_VS_DBG_RL("ip6_route_output error, dest: %pI6\n",
38ff4fa4 169 &cp->daddr.in6);
38cdcc9a
JV		 170 return NULL;
171 }
172 }
173
174 return rt;
175}
176#endif
177
1da177e4
LT		 178
179/*
180 * Release dest->dst_cache before a dest is removed
181 */
182void
183ip_vs_dst_reset(struct ip_vs_dest *dest)
184{
185 struct dst_entry *old_dst;
186
187 old_dst = dest->dst_cache;
188 dest->dst_cache = NULL;
189 dst_release(old_dst);
190}
191
38cdcc9a 192#define IP_VS_XMIT(pf, skb, rt) \
1da177e4 193do { \
6869c4d8 194 (skb)->ipvs_property = 1; \
ccc7911f 195 skb_forward_csum(skb); \
38cdcc9a 196 NF_HOOK(pf, NF_INET_LOCAL_OUT, (skb), NULL, \
1da177e4
LT		 197 (rt)->u.dst.dev, dst_output); \
198} while (0)
199
200
201/*
202 * NULL transmitter (do nothing except return NF_ACCEPT)
203 */
204int
205ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
206 struct ip_vs_protocol *pp)
207{
208 /* we do not touch skb and do not need pskb ptr */
209 return NF_ACCEPT;
210}
211
212
213/*
214 * Bypass transmitter
215 * Let packets bypass the destination when the destination is not
216 * available, it may be only used in transparent cache cluster.
217 */
218int
219ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
220 struct ip_vs_protocol *pp)
221{
222 struct rtable *rt; /* Route to the other host */
eddc9ec5 223 struct iphdr *iph = ip_hdr(skb);
1da177e4
LT		 224 u8 tos = iph->tos;
225 int mtu;
226 struct flowi fl = {
227 .oif = 0,
228 .nl_u = {
229 .ip4_u = {
230 .daddr = iph->daddr,
231 .saddr = 0,
232 .tos = RT_TOS(tos), } },
233 };
234
235 EnterFunction(10);
236
f206351a 237 if (ip_route_output_key(&init_net, &rt, &fl)) {
14d5e834
HH		 238 IP_VS_DBG_RL("ip_vs_bypass_xmit(): ip_route_output error, dest: %pI4\n",
239 &iph->daddr);
1da177e4
LT		 240 goto tx_error_icmp;
241 }
242
243 /* MTU checking */
244 mtu = dst_mtu(&rt->u.dst);
4412ec49 245 if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF))) {
1da177e4
LT		 246 ip_rt_put(rt);
247 icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
248 IP_VS_DBG_RL("ip_vs_bypass_xmit(): frag needed\n");
249 goto tx_error;
250 }
251
252 /*
253 * Call ip_send_check because we are not sure it is called
254 * after ip_defrag. Is copy-on-write needed?
255 */
256 if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) {
257 ip_rt_put(rt);
258 return NF_STOLEN;
259 }
eddc9ec5 260 ip_send_check(ip_hdr(skb));
1da177e4
LT		 261
262 /* drop old route */
adf30907
ED		 263 skb_dst_drop(skb);
264 skb_dst_set(skb, &rt->u.dst);
1da177e4
LT		 265
266 /* Another hack: avoid icmp_send in ip_fragment */
267 skb->local_df = 1;
268
38cdcc9a 269 IP_VS_XMIT(PF_INET, skb, rt);
1da177e4
LT		 270
271 LeaveFunction(10);
272 return NF_STOLEN;
273
274 tx_error_icmp:
275 dst_link_failure(skb);
276 tx_error:
277 kfree_skb(skb);
278 LeaveFunction(10);
279 return NF_STOLEN;
280}
281
b3cdd2a7
JV		 282#ifdef CONFIG_IP_VS_IPV6
283int
284ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
285 struct ip_vs_protocol *pp)
286{
287 struct rt6_info *rt; /* Route to the other host */
288 struct ipv6hdr *iph = ipv6_hdr(skb);
289 int mtu;
290 struct flowi fl = {
291 .oif = 0,
292 .nl_u = {
293 .ip6_u = {
294 .daddr = iph->daddr,
295 .saddr = { .s6_addr32 = {0, 0, 0, 0} }, } },
296 };
297
298 EnterFunction(10);
299
300 rt = (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
301 if (!rt) {
5b095d98 302 IP_VS_DBG_RL("ip_vs_bypass_xmit_v6(): ip6_route_output error, dest: %pI6\n",
38ff4fa4 303 &iph->daddr);
b3cdd2a7
JV		 304 goto tx_error_icmp;
305 }
306
307 /* MTU checking */
308 mtu = dst_mtu(&rt->u.dst);
309 if (skb->len > mtu) {
310 dst_release(&rt->u.dst);
311 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
312 IP_VS_DBG_RL("ip_vs_bypass_xmit_v6(): frag needed\n");
313 goto tx_error;
314 }
315
316 /*
317 * Call ip_send_check because we are not sure it is called
318 * after ip_defrag. Is copy-on-write needed?
319 */
320 skb = skb_share_check(skb, GFP_ATOMIC);
321 if (unlikely(skb == NULL)) {
322 dst_release(&rt->u.dst);
323 return NF_STOLEN;
324 }
325
326 /* drop old route */
adf30907
ED		 327 skb_dst_drop(skb);
328 skb_dst_set(skb, &rt->u.dst);
b3cdd2a7
JV		 329
330 /* Another hack: avoid icmp_send in ip_fragment */
331 skb->local_df = 1;
332
333 IP_VS_XMIT(PF_INET6, skb, rt);
334
335 LeaveFunction(10);
336 return NF_STOLEN;
337
338 tx_error_icmp:
339 dst_link_failure(skb);
340 tx_error:
341 kfree_skb(skb);
342 LeaveFunction(10);
343 return NF_STOLEN;
344}
345#endif
1da177e4
LT		 346
347/*
348 * NAT transmitter (only for outside-to-inside nat forwarding)
349 * Not used for related ICMP
350 */
351int
352ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
353 struct ip_vs_protocol *pp)
354{
355 struct rtable *rt; /* Route to the other host */
356 int mtu;
eddc9ec5 357 struct iphdr *iph = ip_hdr(skb);
1da177e4
LT		 358
359 EnterFunction(10);
360
361 /* check if it is a connection of no-client-port */
362 if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) {
014d730d 363 __be16 _pt, *p;
1da177e4
LT		 364 p = skb_header_pointer(skb, iph->ihl*4, sizeof(_pt), &_pt);
365 if (p == NULL)
366 goto tx_error;
367 ip_vs_conn_fill_cport(cp, *p);
368 IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p));
369 }
370
371 if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(iph->tos))))
372 goto tx_error_icmp;
373
374 /* MTU checking */
375 mtu = dst_mtu(&rt->u.dst);
4412ec49 376 if ((skb->len > mtu) && (iph->frag_off & htons(IP_DF))) {
1da177e4
LT		 377 ip_rt_put(rt);
378 icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
379 IP_VS_DBG_RL_PKT(0, pp, skb, 0, "ip_vs_nat_xmit(): frag needed for");
380 goto tx_error;
381 }
382
383 /* copy-on-write the packet before mangling it */
af1e1cf0 384 if (!skb_make_writable(skb, sizeof(struct iphdr)))
1da177e4
LT		 385 goto tx_error_put;
386
387 if (skb_cow(skb, rt->u.dst.dev->hard_header_len))
388 goto tx_error_put;
389
390 /* drop old route */
adf30907
ED		 391 skb_dst_drop(skb);
392 skb_dst_set(skb, &rt->u.dst);
1da177e4
LT		 393
394 /* mangle the packet */
3db05fea 395 if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp))
1da177e4 396 goto tx_error;
e7ade46a 397 ip_hdr(skb)->daddr = cp->daddr.ip;
eddc9ec5 398 ip_send_check(ip_hdr(skb));
1da177e4
LT		 399
400 IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
401
402 /* FIXME: when application helper enlarges the packet and the length
403 is larger than the MTU of outgoing device, there will be still
404 MTU problem. */
405
406 /* Another hack: avoid icmp_send in ip_fragment */
407 skb->local_df = 1;
408
38cdcc9a 409 IP_VS_XMIT(PF_INET, skb, rt);
1da177e4
LT		 410
411 LeaveFunction(10);
412 return NF_STOLEN;
413
414 tx_error_icmp:
415 dst_link_failure(skb);
416 tx_error:
417 LeaveFunction(10);
418 kfree_skb(skb);
419 return NF_STOLEN;
420 tx_error_put:
421 ip_rt_put(rt);
422 goto tx_error;
423}
424
b3cdd2a7
JV		 425#ifdef CONFIG_IP_VS_IPV6
426int
427ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
428 struct ip_vs_protocol *pp)
429{
430 struct rt6_info *rt; /* Route to the other host */
431 int mtu;
432
433 EnterFunction(10);
434
435 /* check if it is a connection of no-client-port */
436 if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) {
437 __be16 _pt, *p;
438 p = skb_header_pointer(skb, sizeof(struct ipv6hdr),
439 sizeof(_pt), &_pt);
440 if (p == NULL)
441 goto tx_error;
442 ip_vs_conn_fill_cport(cp, *p);
443 IP_VS_DBG(10, "filled cport=%d\n", ntohs(*p));
444 }
445
446 rt = __ip_vs_get_out_rt_v6(cp);
447 if (!rt)
448 goto tx_error_icmp;
449
450 /* MTU checking */
451 mtu = dst_mtu(&rt->u.dst);
452 if (skb->len > mtu) {
453 dst_release(&rt->u.dst);
454 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
455 IP_VS_DBG_RL_PKT(0, pp, skb, 0,
456 "ip_vs_nat_xmit_v6(): frag needed for");
457 goto tx_error;
458 }
459
460 /* copy-on-write the packet before mangling it */
461 if (!skb_make_writable(skb, sizeof(struct ipv6hdr)))
462 goto tx_error_put;
463
464 if (skb_cow(skb, rt->u.dst.dev->hard_header_len))
465 goto tx_error_put;
466
467 /* drop old route */
adf30907
ED		 468 skb_dst_drop(skb);
469 skb_dst_set(skb, &rt->u.dst);
b3cdd2a7
JV		 470
471 /* mangle the packet */
472 if (pp->dnat_handler && !pp->dnat_handler(skb, pp, cp))
473 goto tx_error;
474 ipv6_hdr(skb)->daddr = cp->daddr.in6;
475
476 IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
477
478 /* FIXME: when application helper enlarges the packet and the length
479 is larger than the MTU of outgoing device, there will be still
480 MTU problem. */
481
482 /* Another hack: avoid icmp_send in ip_fragment */
483 skb->local_df = 1;
484
485 IP_VS_XMIT(PF_INET6, skb, rt);
486
487 LeaveFunction(10);
488 return NF_STOLEN;
489
490tx_error_icmp:
491 dst_link_failure(skb);
492tx_error:
493 LeaveFunction(10);
494 kfree_skb(skb);
495 return NF_STOLEN;
496tx_error_put:
497 dst_release(&rt->u.dst);
498 goto tx_error;
499}
500#endif
501
1da177e4
LT		 502
503/*
504 * IP Tunneling transmitter
505 *
506 * This function encapsulates the packet in a new IP packet, its
507 * destination will be set to cp->daddr. Most code of this function
508 * is taken from ipip.c.
509 *
510 * It is used in VS/TUN cluster. The load balancer selects a real
511 * server from a cluster based on a scheduling algorithm,
512 * encapsulates the request packet and forwards it to the selected
513 * server. For example, all real servers are configured with
514 * "ifconfig tunl0 <Virtual IP Address> up". When the server receives
515 * the encapsulated packet, it will decapsulate the packet, processe
516 * the request and return the response packets directly to the client
517 * without passing the load balancer. This can greatly increase the
518 * scalability of virtual server.
519 *
520 * Used for ANY protocol
521 */
522int
523ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
524 struct ip_vs_protocol *pp)
525{
526 struct rtable *rt; /* Route to the other host */
527 struct net_device *tdev; /* Device to other host */
eddc9ec5 528 struct iphdr *old_iph = ip_hdr(skb);
1da177e4 529 u8 tos = old_iph->tos;
76ab608d 530 __be16 df = old_iph->frag_off;
2e07fa9c 531 sk_buff_data_t old_transport_header = skb->transport_header;
1da177e4 532 struct iphdr *iph; /* Our new IP header */
c2636b4d 533 unsigned int max_headroom; /* The extra header space needed */
1da177e4
LT		 534 int mtu;
535
536 EnterFunction(10);
537
4412ec49 538 if (skb->protocol != htons(ETH_P_IP)) {
1da177e4
LT		 539 IP_VS_DBG_RL("ip_vs_tunnel_xmit(): protocol error, "
540 "ETH_P_IP: %d, skb protocol: %d\n",
4412ec49 541 htons(ETH_P_IP), skb->protocol);
1da177e4
LT		 542 goto tx_error;
543 }
544
545 if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(tos))))
546 goto tx_error_icmp;
547
548 tdev = rt->u.dst.dev;
549
550 mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr);
551 if (mtu < 68) {
552 ip_rt_put(rt);
553 IP_VS_DBG_RL("ip_vs_tunnel_xmit(): mtu less than 68\n");
554 goto tx_error;
555 }
adf30907
ED		 556 if (skb_dst(skb))
557 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
1da177e4 558
4412ec49 559 df |= (old_iph->frag_off & htons(IP_DF));
1da177e4 560
4412ec49 561 if ((old_iph->frag_off & htons(IP_DF))
1da177e4
LT		 562 && mtu < ntohs(old_iph->tot_len)) {
563 icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
564 ip_rt_put(rt);
565 IP_VS_DBG_RL("ip_vs_tunnel_xmit(): frag needed\n");
566 goto tx_error;
567 }
568
569 /*
570 * Okay, now see if we can stuff it in the buffer as-is.
571 */
572 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr);
573
574 if (skb_headroom(skb) < max_headroom
575 || skb_cloned(skb) || skb_shared(skb)) {
576 struct sk_buff *new_skb =
577 skb_realloc_headroom(skb, max_headroom);
578 if (!new_skb) {
579 ip_rt_put(rt);
580 kfree_skb(skb);
581 IP_VS_ERR_RL("ip_vs_tunnel_xmit(): no memory\n");
582 return NF_STOLEN;
583 }
584 kfree_skb(skb);
585 skb = new_skb;
eddc9ec5 586 old_iph = ip_hdr(skb);
1da177e4
LT		 587 }
588
b0e380b1 589 skb->transport_header = old_transport_header;
1da177e4
LT		 590
591 /* fix old IP header checksum */
592 ip_send_check(old_iph);
593
e2d1bca7
ACM		 594 skb_push(skb, sizeof(struct iphdr));
595 skb_reset_network_header(skb);
1da177e4
LT		 596 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
597
598 /* drop old route */
adf30907
ED		 599 skb_dst_drop(skb);
600 skb_dst_set(skb, &rt->u.dst);
1da177e4
LT		 601
602 /*
603 * Push down and install the IPIP header.
604 */
eddc9ec5 605 iph = ip_hdr(skb);
1da177e4
LT		 606 iph->version = 4;
607 iph->ihl = sizeof(struct iphdr)>>2;
608 iph->frag_off = df;
609 iph->protocol = IPPROTO_IPIP;
610 iph->tos = tos;
611 iph->daddr = rt->rt_dst;
612 iph->saddr = rt->rt_src;
613 iph->ttl = old_iph->ttl;
1da177e4 614 ip_select_ident(iph, &rt->u.dst, NULL);
1da177e4
LT		 615
616 /* Another hack: avoid icmp_send in ip_fragment */
617 skb->local_df = 1;
618
c439cb2e 619 ip_local_out(skb);
1da177e4
LT		 620
621 LeaveFunction(10);
622
623 return NF_STOLEN;
624
625 tx_error_icmp:
626 dst_link_failure(skb);
627 tx_error:
628 kfree_skb(skb);
629 LeaveFunction(10);
630 return NF_STOLEN;
631}
632
b3cdd2a7
JV		 633#ifdef CONFIG_IP_VS_IPV6
634int
635ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
636 struct ip_vs_protocol *pp)
637{
638 struct rt6_info *rt; /* Route to the other host */
639 struct net_device *tdev; /* Device to other host */
640 struct ipv6hdr *old_iph = ipv6_hdr(skb);
641 sk_buff_data_t old_transport_header = skb->transport_header;
642 struct ipv6hdr *iph; /* Our new IP header */
643 unsigned int max_headroom; /* The extra header space needed */
644 int mtu;
645
646 EnterFunction(10);
647
648 if (skb->protocol != htons(ETH_P_IPV6)) {
649 IP_VS_DBG_RL("ip_vs_tunnel_xmit_v6(): protocol error, "
650 "ETH_P_IPV6: %d, skb protocol: %d\n",
651 htons(ETH_P_IPV6), skb->protocol);
652 goto tx_error;
653 }
654
655 rt = __ip_vs_get_out_rt_v6(cp);
656 if (!rt)
657 goto tx_error_icmp;
658
659 tdev = rt->u.dst.dev;
660
661 mtu = dst_mtu(&rt->u.dst) - sizeof(struct ipv6hdr);
662 /* TODO IPv6: do we need this check in IPv6? */
663 if (mtu < 1280) {
664 dst_release(&rt->u.dst);
665 IP_VS_DBG_RL("ip_vs_tunnel_xmit_v6(): mtu less than 1280\n");
666 goto tx_error;
667 }
adf30907
ED		 668 if (skb_dst(skb))
669 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
b3cdd2a7
JV		 670
671 if (mtu < ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr)) {
672 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
673 dst_release(&rt->u.dst);
674 IP_VS_DBG_RL("ip_vs_tunnel_xmit_v6(): frag needed\n");
675 goto tx_error;
676 }
677
678 /*
679 * Okay, now see if we can stuff it in the buffer as-is.
680 */
681 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr);
682
683 if (skb_headroom(skb) < max_headroom
684 || skb_cloned(skb) || skb_shared(skb)) {
685 struct sk_buff *new_skb =
686 skb_realloc_headroom(skb, max_headroom);
687 if (!new_skb) {
688 dst_release(&rt->u.dst);
689 kfree_skb(skb);
690 IP_VS_ERR_RL("ip_vs_tunnel_xmit_v6(): no memory\n");
691 return NF_STOLEN;
692 }
693 kfree_skb(skb);
694 skb = new_skb;
695 old_iph = ipv6_hdr(skb);
696 }
697
698 skb->transport_header = old_transport_header;
699
700 skb_push(skb, sizeof(struct ipv6hdr));
701 skb_reset_network_header(skb);
702 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
703
704 /* drop old route */
adf30907
ED		 705 skb_dst_drop(skb);
706 skb_dst_set(skb, &rt->u.dst);
b3cdd2a7
JV		 707
708 /*
709 * Push down and install the IPIP header.
710 */
711 iph = ipv6_hdr(skb);
712 iph->version = 6;
713 iph->nexthdr = IPPROTO_IPV6;
b7b45f47
HH		 714 iph->payload_len = old_iph->payload_len;
715 be16_add_cpu(&iph->payload_len, sizeof(*old_iph));
b3cdd2a7
JV		 716 iph->priority = old_iph->priority;
717 memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl));
718 iph->daddr = rt->rt6i_dst.addr;
719 iph->saddr = cp->vaddr.in6; /* rt->rt6i_src.addr; */
720 iph->hop_limit = old_iph->hop_limit;
721
722 /* Another hack: avoid icmp_send in ip_fragment */
723 skb->local_df = 1;
724
725 ip6_local_out(skb);
726
727 LeaveFunction(10);
728
729 return NF_STOLEN;
730
731tx_error_icmp:
732 dst_link_failure(skb);
733tx_error:
734 kfree_skb(skb);
735 LeaveFunction(10);
736 return NF_STOLEN;
737}
738#endif
739
1da177e4
LT		 740
741/*
742 * Direct Routing transmitter
743 * Used for ANY protocol
744 */
745int
746ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
747 struct ip_vs_protocol *pp)
748{
749 struct rtable *rt; /* Route to the other host */
eddc9ec5 750 struct iphdr *iph = ip_hdr(skb);
1da177e4
LT		 751 int mtu;
752
753 EnterFunction(10);
754
755 if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(iph->tos))))
756 goto tx_error_icmp;
757
758 /* MTU checking */
759 mtu = dst_mtu(&rt->u.dst);
4412ec49 760 if ((iph->frag_off & htons(IP_DF)) && skb->len > mtu) {
1da177e4
LT		 761 icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
762 ip_rt_put(rt);
763 IP_VS_DBG_RL("ip_vs_dr_xmit(): frag needed\n");
764 goto tx_error;
765 }
766
767 /*
768 * Call ip_send_check because we are not sure it is called
769 * after ip_defrag. Is copy-on-write needed?
770 */
771 if (unlikely((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)) {
772 ip_rt_put(rt);
773 return NF_STOLEN;
774 }
eddc9ec5 775 ip_send_check(ip_hdr(skb));
1da177e4
LT		 776
777 /* drop old route */
adf30907
ED		 778 skb_dst_drop(skb);
779 skb_dst_set(skb, &rt->u.dst);
1da177e4
LT		 780
781 /* Another hack: avoid icmp_send in ip_fragment */
782 skb->local_df = 1;
783
38cdcc9a 784 IP_VS_XMIT(PF_INET, skb, rt);
1da177e4
LT		 785
786 LeaveFunction(10);
787 return NF_STOLEN;
788
789 tx_error_icmp:
790 dst_link_failure(skb);
791 tx_error:
792 kfree_skb(skb);
793 LeaveFunction(10);
794 return NF_STOLEN;
795}
796
b3cdd2a7
JV		 797#ifdef CONFIG_IP_VS_IPV6
798int
799ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
800 struct ip_vs_protocol *pp)
801{
802 struct rt6_info *rt; /* Route to the other host */
803 int mtu;
804
805 EnterFunction(10);
806
807 rt = __ip_vs_get_out_rt_v6(cp);
808 if (!rt)
809 goto tx_error_icmp;
810
811 /* MTU checking */
812 mtu = dst_mtu(&rt->u.dst);
813 if (skb->len > mtu) {
814 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
815 dst_release(&rt->u.dst);
816 IP_VS_DBG_RL("ip_vs_dr_xmit_v6(): frag needed\n");
817 goto tx_error;
818 }
819
820 /*
821 * Call ip_send_check because we are not sure it is called
822 * after ip_defrag. Is copy-on-write needed?
823 */
824 skb = skb_share_check(skb, GFP_ATOMIC);
825 if (unlikely(skb == NULL)) {
826 dst_release(&rt->u.dst);
827 return NF_STOLEN;
828 }
829
830 /* drop old route */
adf30907
ED		 831 skb_dst_drop(skb);
832 skb_dst_set(skb, &rt->u.dst);
b3cdd2a7
JV		 833
834 /* Another hack: avoid icmp_send in ip_fragment */
835 skb->local_df = 1;
836
837 IP_VS_XMIT(PF_INET6, skb, rt);
838
839 LeaveFunction(10);
840 return NF_STOLEN;
841
842tx_error_icmp:
843 dst_link_failure(skb);
844tx_error:
845 kfree_skb(skb);
846 LeaveFunction(10);
847 return NF_STOLEN;
848}
849#endif
850
1da177e4
LT		 851
852/*
853 * ICMP packet transmitter
854 * called by the ip_vs_in_icmp
855 */
856int
857ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
858 struct ip_vs_protocol *pp, int offset)
859{
860 struct rtable *rt; /* Route to the other host */
861 int mtu;
862 int rc;
863
864 EnterFunction(10);
865
866 /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be
867 forwarded directly here, because there is no need to
868 translate address/port back */
869 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) {
870 if (cp->packet_xmit)
871 rc = cp->packet_xmit(skb, cp, pp);
872 else
873 rc = NF_ACCEPT;
874 /* do not touch skb anymore */
875 atomic_inc(&cp->in_pkts);
1da177e4
LT		 876 goto out;
877 }
878
879 /*
880 * mangle and send the packet here (only for VS/NAT)
881 */
882
eddc9ec5 883 if (!(rt = __ip_vs_get_out_rt(cp, RT_TOS(ip_hdr(skb)->tos))))
1da177e4
LT		 884 goto tx_error_icmp;
885
886 /* MTU checking */
887 mtu = dst_mtu(&rt->u.dst);
eddc9ec5 888 if ((skb->len > mtu) && (ip_hdr(skb)->frag_off & htons(IP_DF))) {
1da177e4
LT		 889 ip_rt_put(rt);
890 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
891 IP_VS_DBG_RL("ip_vs_in_icmp(): frag needed\n");
892 goto tx_error;
893 }
894
895 /* copy-on-write the packet before mangling it */
af1e1cf0 896 if (!skb_make_writable(skb, offset))
1da177e4
LT		 897 goto tx_error_put;
898
899 if (skb_cow(skb, rt->u.dst.dev->hard_header_len))
900 goto tx_error_put;
901
902 /* drop the old route when skb is not shared */
adf30907
ED		 903 skb_dst_drop(skb);
904 skb_dst_set(skb, &rt->u.dst);
1da177e4
LT		 905
906 ip_vs_nat_icmp(skb, pp, cp, 0);
907
908 /* Another hack: avoid icmp_send in ip_fragment */
909 skb->local_df = 1;
910
38cdcc9a 911 IP_VS_XMIT(PF_INET, skb, rt);
1da177e4
LT		 912
913 rc = NF_STOLEN;
914 goto out;
915
916 tx_error_icmp:
917 dst_link_failure(skb);
918 tx_error:
919 dev_kfree_skb(skb);
920 rc = NF_STOLEN;
921 out:
922 LeaveFunction(10);
923 return rc;
924 tx_error_put:
925 ip_rt_put(rt);
926 goto tx_error;
927}
b3cdd2a7
JV		 928
929#ifdef CONFIG_IP_VS_IPV6
930int
931ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
932 struct ip_vs_protocol *pp, int offset)
933{
934 struct rt6_info *rt; /* Route to the other host */
935 int mtu;
936 int rc;
937
938 EnterFunction(10);
939
940 /* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be
941 forwarded directly here, because there is no need to
942 translate address/port back */
943 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) {
944 if (cp->packet_xmit)
945 rc = cp->packet_xmit(skb, cp, pp);
946 else
947 rc = NF_ACCEPT;
948 /* do not touch skb anymore */
949 atomic_inc(&cp->in_pkts);
950 goto out;
951 }
952
953 /*
954 * mangle and send the packet here (only for VS/NAT)
955 */
956
957 rt = __ip_vs_get_out_rt_v6(cp);
958 if (!rt)
959 goto tx_error_icmp;
960
961 /* MTU checking */
962 mtu = dst_mtu(&rt->u.dst);
963 if (skb->len > mtu) {
964 dst_release(&rt->u.dst);
965 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
966 IP_VS_DBG_RL("ip_vs_in_icmp(): frag needed\n");
967 goto tx_error;
968 }
969
970 /* copy-on-write the packet before mangling it */
971 if (!skb_make_writable(skb, offset))
972 goto tx_error_put;
973
974 if (skb_cow(skb, rt->u.dst.dev->hard_header_len))
975 goto tx_error_put;
976
977 /* drop the old route when skb is not shared */
adf30907
ED		 978 skb_dst_drop(skb);
979 skb_dst_set(skb, &rt->u.dst);
b3cdd2a7
JV		 980
981 ip_vs_nat_icmp_v6(skb, pp, cp, 0);
982
983 /* Another hack: avoid icmp_send in ip_fragment */
984 skb->local_df = 1;
985
986 IP_VS_XMIT(PF_INET6, skb, rt);
987
988 rc = NF_STOLEN;
989 goto out;
990
991tx_error_icmp:
992 dst_link_failure(skb);
993tx_error:
994 dev_kfree_skb(skb);
995 rc = NF_STOLEN;
996out:
997 LeaveFunction(10);
998 return rc;
999tx_error_put:
1000 dst_release(&rt->u.dst);
1001 goto tx_error;
1002}
1003#endif
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