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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPVS An implementation of the IP virtual server support for the | |
3 | * LINUX operating system. IPVS is now implemented as a module | |
4 | * over the Netfilter framework. IPVS can be used to build a | |
5 | * high-performance and highly available server based on a | |
6 | * cluster of servers. | |
7 | * | |
1da177e4 LT |
8 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
9 | * Peter Kese <peter.kese@ijs.si> | |
10 | * Julian Anastasov <ja@ssi.bg> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | * | |
17 | * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, | |
18 | * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms | |
19 | * and others. | |
20 | * | |
21 | * Changes: | |
22 | * Paul `Rusty' Russell properly handle non-linear skbs | |
6869c4d8 | 23 | * Harald Welte don't use nfcache |
1da177e4 LT |
24 | * |
25 | */ | |
26 | ||
9aada7ac HE |
27 | #define KMSG_COMPONENT "IPVS" |
28 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/kernel.h> | |
32 | #include <linux/ip.h> | |
33 | #include <linux/tcp.h> | |
2906f66a | 34 | #include <linux/sctp.h> |
1da177e4 | 35 | #include <linux/icmp.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 LT |
37 | |
38 | #include <net/ip.h> | |
39 | #include <net/tcp.h> | |
40 | #include <net/udp.h> | |
41 | #include <net/icmp.h> /* for icmp_send */ | |
42 | #include <net/route.h> | |
2c70b519 | 43 | #include <net/ip6_checksum.h> |
61b1ab45 | 44 | #include <net/netns/generic.h> /* net_generic() */ |
1da177e4 LT |
45 | |
46 | #include <linux/netfilter.h> | |
47 | #include <linux/netfilter_ipv4.h> | |
48 | ||
2a3b791e JV |
49 | #ifdef CONFIG_IP_VS_IPV6 |
50 | #include <net/ipv6.h> | |
51 | #include <linux/netfilter_ipv6.h> | |
489fdeda | 52 | #include <net/ip6_route.h> |
2a3b791e JV |
53 | #endif |
54 | ||
1da177e4 LT |
55 | #include <net/ip_vs.h> |
56 | ||
57 | ||
58 | EXPORT_SYMBOL(register_ip_vs_scheduler); | |
59 | EXPORT_SYMBOL(unregister_ip_vs_scheduler); | |
1da177e4 LT |
60 | EXPORT_SYMBOL(ip_vs_proto_name); |
61 | EXPORT_SYMBOL(ip_vs_conn_new); | |
62 | EXPORT_SYMBOL(ip_vs_conn_in_get); | |
63 | EXPORT_SYMBOL(ip_vs_conn_out_get); | |
64 | #ifdef CONFIG_IP_VS_PROTO_TCP | |
65 | EXPORT_SYMBOL(ip_vs_tcp_conn_listen); | |
66 | #endif | |
67 | EXPORT_SYMBOL(ip_vs_conn_put); | |
68 | #ifdef CONFIG_IP_VS_DEBUG | |
69 | EXPORT_SYMBOL(ip_vs_get_debug_level); | |
70 | #endif | |
1da177e4 | 71 | |
b962abdc | 72 | static int ip_vs_net_id __read_mostly; |
61b1ab45 HS |
73 | /* netns cnt used for uniqueness */ |
74 | static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0); | |
1da177e4 LT |
75 | |
76 | /* ID used in ICMP lookups */ | |
77 | #define icmp_id(icmph) (((icmph)->un).echo.id) | |
2a3b791e | 78 | #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier) |
1da177e4 | 79 | |
95c96174 | 80 | const char *ip_vs_proto_name(unsigned int proto) |
1da177e4 LT |
81 | { |
82 | static char buf[20]; | |
83 | ||
84 | switch (proto) { | |
85 | case IPPROTO_IP: | |
86 | return "IP"; | |
87 | case IPPROTO_UDP: | |
88 | return "UDP"; | |
89 | case IPPROTO_TCP: | |
90 | return "TCP"; | |
2906f66a VMR |
91 | case IPPROTO_SCTP: |
92 | return "SCTP"; | |
1da177e4 LT |
93 | case IPPROTO_ICMP: |
94 | return "ICMP"; | |
2a3b791e JV |
95 | #ifdef CONFIG_IP_VS_IPV6 |
96 | case IPPROTO_ICMPV6: | |
97 | return "ICMPv6"; | |
98 | #endif | |
1da177e4 LT |
99 | default: |
100 | sprintf(buf, "IP_%d", proto); | |
101 | return buf; | |
102 | } | |
103 | } | |
104 | ||
105 | void ip_vs_init_hash_table(struct list_head *table, int rows) | |
106 | { | |
107 | while (--rows >= 0) | |
108 | INIT_LIST_HEAD(&table[rows]); | |
109 | } | |
110 | ||
111 | static inline void | |
112 | ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
113 | { | |
114 | struct ip_vs_dest *dest = cp->dest; | |
b17fc996 HS |
115 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
116 | ||
1da177e4 | 117 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
b17fc996 HS |
118 | struct ip_vs_cpu_stats *s; |
119 | ||
120 | s = this_cpu_ptr(dest->stats.cpustats); | |
121 | s->ustats.inpkts++; | |
122 | u64_stats_update_begin(&s->syncp); | |
123 | s->ustats.inbytes += skb->len; | |
124 | u64_stats_update_end(&s->syncp); | |
125 | ||
126 | s = this_cpu_ptr(dest->svc->stats.cpustats); | |
127 | s->ustats.inpkts++; | |
128 | u64_stats_update_begin(&s->syncp); | |
129 | s->ustats.inbytes += skb->len; | |
130 | u64_stats_update_end(&s->syncp); | |
131 | ||
2a0751af | 132 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
b17fc996 HS |
133 | s->ustats.inpkts++; |
134 | u64_stats_update_begin(&s->syncp); | |
135 | s->ustats.inbytes += skb->len; | |
136 | u64_stats_update_end(&s->syncp); | |
1da177e4 LT |
137 | } |
138 | } | |
139 | ||
140 | ||
141 | static inline void | |
142 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
143 | { | |
144 | struct ip_vs_dest *dest = cp->dest; | |
b17fc996 HS |
145 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
146 | ||
1da177e4 | 147 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
b17fc996 HS |
148 | struct ip_vs_cpu_stats *s; |
149 | ||
150 | s = this_cpu_ptr(dest->stats.cpustats); | |
151 | s->ustats.outpkts++; | |
152 | u64_stats_update_begin(&s->syncp); | |
153 | s->ustats.outbytes += skb->len; | |
154 | u64_stats_update_end(&s->syncp); | |
155 | ||
156 | s = this_cpu_ptr(dest->svc->stats.cpustats); | |
157 | s->ustats.outpkts++; | |
158 | u64_stats_update_begin(&s->syncp); | |
159 | s->ustats.outbytes += skb->len; | |
160 | u64_stats_update_end(&s->syncp); | |
161 | ||
2a0751af | 162 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
b17fc996 HS |
163 | s->ustats.outpkts++; |
164 | u64_stats_update_begin(&s->syncp); | |
165 | s->ustats.outbytes += skb->len; | |
166 | u64_stats_update_end(&s->syncp); | |
1da177e4 LT |
167 | } |
168 | } | |
169 | ||
170 | ||
171 | static inline void | |
172 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) | |
173 | { | |
b17fc996 HS |
174 | struct netns_ipvs *ipvs = net_ipvs(svc->net); |
175 | struct ip_vs_cpu_stats *s; | |
1da177e4 | 176 | |
b17fc996 HS |
177 | s = this_cpu_ptr(cp->dest->stats.cpustats); |
178 | s->ustats.conns++; | |
1da177e4 | 179 | |
b17fc996 HS |
180 | s = this_cpu_ptr(svc->stats.cpustats); |
181 | s->ustats.conns++; | |
182 | ||
2a0751af | 183 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
b17fc996 | 184 | s->ustats.conns++; |
1da177e4 LT |
185 | } |
186 | ||
187 | ||
4a516f11 | 188 | static inline void |
1da177e4 LT |
189 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, |
190 | const struct sk_buff *skb, | |
9330419d | 191 | struct ip_vs_proto_data *pd) |
1da177e4 | 192 | { |
4a516f11 SH |
193 | if (likely(pd->pp->state_transition)) |
194 | pd->pp->state_transition(cp, direction, skb, pd); | |
1da177e4 LT |
195 | } |
196 | ||
a5959d53 | 197 | static inline int |
85999283 SH |
198 | ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc, |
199 | struct sk_buff *skb, int protocol, | |
200 | const union nf_inet_addr *caddr, __be16 cport, | |
201 | const union nf_inet_addr *vaddr, __be16 vport, | |
202 | struct ip_vs_conn_param *p) | |
203 | { | |
6e67e586 HS |
204 | ip_vs_conn_fill_param(svc->net, svc->af, protocol, caddr, cport, vaddr, |
205 | vport, p); | |
ceec4c38 | 206 | p->pe = rcu_dereference(svc->pe); |
85999283 | 207 | if (p->pe && p->pe->fill_param) |
a5959d53 HS |
208 | return p->pe->fill_param(p, skb); |
209 | ||
210 | return 0; | |
85999283 | 211 | } |
1da177e4 | 212 | |
1da177e4 LT |
213 | /* |
214 | * IPVS persistent scheduling function | |
215 | * It creates a connection entry according to its template if exists, | |
216 | * or selects a server and creates a connection entry plus a template. | |
217 | * Locking: we are svc user (svc->refcnt), so we hold all dests too | |
218 | * Protocols supported: TCP, UDP | |
219 | */ | |
220 | static struct ip_vs_conn * | |
221 | ip_vs_sched_persist(struct ip_vs_service *svc, | |
d4383f04 JDB |
222 | struct sk_buff *skb, __be16 src_port, __be16 dst_port, |
223 | int *ignored, struct ip_vs_iphdr *iph) | |
1da177e4 LT |
224 | { |
225 | struct ip_vs_conn *cp = NULL; | |
1da177e4 LT |
226 | struct ip_vs_dest *dest; |
227 | struct ip_vs_conn *ct; | |
5b57a98c | 228 | __be16 dport = 0; /* destination port to forward */ |
3575792e | 229 | unsigned int flags; |
f11017ec | 230 | struct ip_vs_conn_param param; |
e0aac52e | 231 | const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) }; |
28364a59 JV |
232 | union nf_inet_addr snet; /* source network of the client, |
233 | after masking */ | |
cd17f9ed | 234 | |
1da177e4 | 235 | /* Mask saddr with the netmask to adjust template granularity */ |
cd17f9ed JV |
236 | #ifdef CONFIG_IP_VS_IPV6 |
237 | if (svc->af == AF_INET6) | |
d4383f04 | 238 | ipv6_addr_prefix(&snet.in6, &iph->saddr.in6, svc->netmask); |
cd17f9ed JV |
239 | else |
240 | #endif | |
d4383f04 | 241 | snet.ip = iph->saddr.ip & svc->netmask; |
1da177e4 | 242 | |
cd17f9ed JV |
243 | IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " |
244 | "mnet %s\n", | |
d4383f04 JDB |
245 | IP_VS_DBG_ADDR(svc->af, &iph->saddr), ntohs(src_port), |
246 | IP_VS_DBG_ADDR(svc->af, &iph->daddr), ntohs(dst_port), | |
cd17f9ed | 247 | IP_VS_DBG_ADDR(svc->af, &snet)); |
1da177e4 LT |
248 | |
249 | /* | |
250 | * As far as we know, FTP is a very complicated network protocol, and | |
251 | * it uses control connection and data connections. For active FTP, | |
252 | * FTP server initialize data connection to the client, its source port | |
253 | * is often 20. For passive FTP, FTP server tells the clients the port | |
254 | * that it passively listens to, and the client issues the data | |
255 | * connection. In the tunneling or direct routing mode, the load | |
256 | * balancer is on the client-to-server half of connection, the port | |
257 | * number is unknown to the load balancer. So, a conn template like | |
258 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP | |
259 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> | |
260 | * is created for other persistent services. | |
261 | */ | |
5b57a98c | 262 | { |
d4383f04 JDB |
263 | int protocol = iph->protocol; |
264 | const union nf_inet_addr *vaddr = &iph->daddr; | |
f11017ec SH |
265 | __be16 vport = 0; |
266 | ||
ce144f24 | 267 | if (dst_port == svc->port) { |
5b57a98c SH |
268 | /* non-FTP template: |
269 | * <protocol, caddr, 0, vaddr, vport, daddr, dport> | |
270 | * FTP template: | |
271 | * <protocol, caddr, 0, vaddr, 0, daddr, 0> | |
1da177e4 LT |
272 | */ |
273 | if (svc->port != FTPPORT) | |
ce144f24 | 274 | vport = dst_port; |
1da177e4 | 275 | } else { |
5b57a98c SH |
276 | /* Note: persistent fwmark-based services and |
277 | * persistent port zero service are handled here. | |
278 | * fwmark template: | |
279 | * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> | |
280 | * port zero template: | |
281 | * <protocol,caddr,0,vaddr,0,daddr,0> | |
1da177e4 | 282 | */ |
28364a59 | 283 | if (svc->fwmark) { |
5b57a98c SH |
284 | protocol = IPPROTO_IP; |
285 | vaddr = &fwmark; | |
286 | } | |
1da177e4 | 287 | } |
a5959d53 HS |
288 | /* return *ignored = -1 so NF_DROP can be used */ |
289 | if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0, | |
290 | vaddr, vport, ¶m) < 0) { | |
291 | *ignored = -1; | |
292 | return NULL; | |
293 | } | |
1da177e4 LT |
294 | } |
295 | ||
5b57a98c | 296 | /* Check if a template already exists */ |
f11017ec | 297 | ct = ip_vs_ct_in_get(¶m); |
5b57a98c | 298 | if (!ct || !ip_vs_check_template(ct)) { |
ceec4c38 JA |
299 | struct ip_vs_scheduler *sched; |
300 | ||
a5959d53 HS |
301 | /* |
302 | * No template found or the dest of the connection | |
5b57a98c | 303 | * template is not available. |
a5959d53 | 304 | * return *ignored=0 i.e. ICMP and NF_DROP |
5b57a98c | 305 | */ |
ceec4c38 JA |
306 | sched = rcu_dereference(svc->scheduler); |
307 | dest = sched->schedule(svc, skb); | |
5b57a98c SH |
308 | if (!dest) { |
309 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
85999283 | 310 | kfree(param.pe_data); |
a5959d53 | 311 | *ignored = 0; |
5b57a98c SH |
312 | return NULL; |
313 | } | |
314 | ||
ce144f24 | 315 | if (dst_port == svc->port && svc->port != FTPPORT) |
5b57a98c SH |
316 | dport = dest->port; |
317 | ||
85999283 SH |
318 | /* Create a template |
319 | * This adds param.pe_data to the template, | |
320 | * and thus param.pe_data will be destroyed | |
321 | * when the template expires */ | |
f11017ec | 322 | ct = ip_vs_conn_new(¶m, &dest->addr, dport, |
0e051e68 | 323 | IP_VS_CONN_F_TEMPLATE, dest, skb->mark); |
85999283 SH |
324 | if (ct == NULL) { |
325 | kfree(param.pe_data); | |
a5959d53 | 326 | *ignored = -1; |
5b57a98c | 327 | return NULL; |
85999283 | 328 | } |
5b57a98c SH |
329 | |
330 | ct->timeout = svc->timeout; | |
85999283 | 331 | } else { |
5b57a98c SH |
332 | /* set destination with the found template */ |
333 | dest = ct->dest; | |
85999283 SH |
334 | kfree(param.pe_data); |
335 | } | |
5b57a98c | 336 | |
ce144f24 | 337 | dport = dst_port; |
5b57a98c SH |
338 | if (dport == svc->port && dest->port) |
339 | dport = dest->port; | |
340 | ||
26ec037f | 341 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
d4383f04 | 342 | && iph->protocol == IPPROTO_UDP) ? |
26ec037f NC |
343 | IP_VS_CONN_F_ONE_PACKET : 0; |
344 | ||
1da177e4 LT |
345 | /* |
346 | * Create a new connection according to the template | |
347 | */ | |
d4383f04 JDB |
348 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, &iph->saddr, |
349 | src_port, &iph->daddr, dst_port, ¶m); | |
ce144f24 | 350 | |
0e051e68 | 351 | cp = ip_vs_conn_new(¶m, &dest->addr, dport, flags, dest, skb->mark); |
1da177e4 LT |
352 | if (cp == NULL) { |
353 | ip_vs_conn_put(ct); | |
a5959d53 | 354 | *ignored = -1; |
1da177e4 LT |
355 | return NULL; |
356 | } | |
357 | ||
358 | /* | |
359 | * Add its control | |
360 | */ | |
361 | ip_vs_control_add(cp, ct); | |
362 | ip_vs_conn_put(ct); | |
363 | ||
364 | ip_vs_conn_stats(cp, svc); | |
365 | return cp; | |
366 | } | |
367 | ||
368 | ||
369 | /* | |
370 | * IPVS main scheduling function | |
371 | * It selects a server according to the virtual service, and | |
372 | * creates a connection entry. | |
373 | * Protocols supported: TCP, UDP | |
a5959d53 HS |
374 | * |
375 | * Usage of *ignored | |
376 | * | |
377 | * 1 : protocol tried to schedule (eg. on SYN), found svc but the | |
378 | * svc/scheduler decides that this packet should be accepted with | |
379 | * NF_ACCEPT because it must not be scheduled. | |
380 | * | |
381 | * 0 : scheduler can not find destination, so try bypass or | |
382 | * return ICMP and then NF_DROP (ip_vs_leave). | |
383 | * | |
384 | * -1 : scheduler tried to schedule but fatal error occurred, eg. | |
385 | * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param | |
386 | * failure such as missing Call-ID, ENOMEM on skb_linearize | |
387 | * or pe_data. In this case we should return NF_DROP without | |
388 | * any attempts to send ICMP with ip_vs_leave. | |
1da177e4 LT |
389 | */ |
390 | struct ip_vs_conn * | |
190ecd27 | 391 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
d4383f04 JDB |
392 | struct ip_vs_proto_data *pd, int *ignored, |
393 | struct ip_vs_iphdr *iph) | |
1da177e4 | 394 | { |
9330419d | 395 | struct ip_vs_protocol *pp = pd->pp; |
1da177e4 | 396 | struct ip_vs_conn *cp = NULL; |
ceec4c38 | 397 | struct ip_vs_scheduler *sched; |
1da177e4 | 398 | struct ip_vs_dest *dest; |
3575792e JA |
399 | __be16 _ports[2], *pptr; |
400 | unsigned int flags; | |
1da177e4 | 401 | |
190ecd27 | 402 | *ignored = 1; |
2f74713d JDB |
403 | /* |
404 | * IPv6 frags, only the first hit here. | |
405 | */ | |
d4383f04 | 406 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
1da177e4 LT |
407 | if (pptr == NULL) |
408 | return NULL; | |
409 | ||
190ecd27 JA |
410 | /* |
411 | * FTPDATA needs this check when using local real server. | |
412 | * Never schedule Active FTPDATA connections from real server. | |
413 | * For LVS-NAT they must be already created. For other methods | |
414 | * with persistence the connection is created on SYN+ACK. | |
415 | */ | |
416 | if (pptr[0] == FTPDATA) { | |
0d79641a JA |
417 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
418 | "Not scheduling FTPDATA"); | |
190ecd27 JA |
419 | return NULL; |
420 | } | |
421 | ||
422 | /* | |
a5959d53 | 423 | * Do not schedule replies from local real server. |
190ecd27 JA |
424 | */ |
425 | if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) && | |
d4383f04 | 426 | (cp = pp->conn_in_get(svc->af, skb, iph, 1))) { |
0d79641a | 427 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
190ecd27 JA |
428 | "Not scheduling reply for existing connection"); |
429 | __ip_vs_conn_put(cp); | |
430 | return NULL; | |
431 | } | |
432 | ||
1da177e4 LT |
433 | /* |
434 | * Persistent service | |
435 | */ | |
a5959d53 | 436 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) |
d4383f04 JDB |
437 | return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored, |
438 | iph); | |
a5959d53 HS |
439 | |
440 | *ignored = 0; | |
1da177e4 LT |
441 | |
442 | /* | |
443 | * Non-persistent service | |
444 | */ | |
445 | if (!svc->fwmark && pptr[1] != svc->port) { | |
446 | if (!svc->port) | |
1e3e238e HE |
447 | pr_err("Schedule: port zero only supported " |
448 | "in persistent services, " | |
449 | "check your ipvs configuration\n"); | |
1da177e4 LT |
450 | return NULL; |
451 | } | |
452 | ||
ceec4c38 JA |
453 | sched = rcu_dereference(svc->scheduler); |
454 | dest = sched->schedule(svc, skb); | |
1da177e4 LT |
455 | if (dest == NULL) { |
456 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
457 | return NULL; | |
458 | } | |
459 | ||
26ec037f | 460 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
d4383f04 | 461 | && iph->protocol == IPPROTO_UDP) ? |
26ec037f NC |
462 | IP_VS_CONN_F_ONE_PACKET : 0; |
463 | ||
1da177e4 LT |
464 | /* |
465 | * Create a connection entry. | |
466 | */ | |
f11017ec SH |
467 | { |
468 | struct ip_vs_conn_param p; | |
6e67e586 | 469 | |
d4383f04 JDB |
470 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
471 | &iph->saddr, pptr[0], &iph->daddr, | |
472 | pptr[1], &p); | |
f11017ec SH |
473 | cp = ip_vs_conn_new(&p, &dest->addr, |
474 | dest->port ? dest->port : pptr[1], | |
0e051e68 | 475 | flags, dest, skb->mark); |
a5959d53 HS |
476 | if (!cp) { |
477 | *ignored = -1; | |
f11017ec | 478 | return NULL; |
a5959d53 | 479 | } |
f11017ec | 480 | } |
1da177e4 | 481 | |
cd17f9ed JV |
482 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
483 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", | |
484 | ip_vs_fwd_tag(cp), | |
485 | IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport), | |
486 | IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport), | |
487 | IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport), | |
488 | cp->flags, atomic_read(&cp->refcnt)); | |
1da177e4 LT |
489 | |
490 | ip_vs_conn_stats(cp, svc); | |
491 | return cp; | |
492 | } | |
493 | ||
494 | ||
495 | /* | |
496 | * Pass or drop the packet. | |
497 | * Called by ip_vs_in, when the virtual service is available but | |
498 | * no destination is available for a new connection. | |
499 | */ | |
500 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
d4383f04 | 501 | struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph) |
1da177e4 | 502 | { |
014d730d | 503 | __be16 _ports[2], *pptr; |
a7a86b86 SH |
504 | #ifdef CONFIG_SYSCTL |
505 | struct net *net; | |
506 | struct netns_ipvs *ipvs; | |
2a3b791e | 507 | int unicast; |
a7a86b86 | 508 | #endif |
9330419d | 509 | |
d4383f04 | 510 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
1da177e4 | 511 | if (pptr == NULL) { |
1da177e4 LT |
512 | return NF_DROP; |
513 | } | |
a7a86b86 SH |
514 | |
515 | #ifdef CONFIG_SYSCTL | |
4a98480b | 516 | net = skb_net(skb); |
1da177e4 | 517 | |
2a3b791e JV |
518 | #ifdef CONFIG_IP_VS_IPV6 |
519 | if (svc->af == AF_INET6) | |
d4383f04 | 520 | unicast = ipv6_addr_type(&iph->daddr.in6) & IPV6_ADDR_UNICAST; |
2a3b791e JV |
521 | else |
522 | #endif | |
d4383f04 | 523 | unicast = (inet_addr_type(net, iph->daddr.ip) == RTN_UNICAST); |
2a3b791e | 524 | |
1da177e4 | 525 | /* if it is fwmark-based service, the cache_bypass sysctl is up |
2a3b791e | 526 | and the destination is a non-local unicast, then create |
1da177e4 | 527 | a cache_bypass connection entry */ |
4a98480b | 528 | ipvs = net_ipvs(net); |
a0840e2e | 529 | if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) { |
ad542ced | 530 | int ret; |
1da177e4 | 531 | struct ip_vs_conn *cp; |
3575792e | 532 | unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && |
d4383f04 | 533 | iph->protocol == IPPROTO_UDP) ? |
3575792e | 534 | IP_VS_CONN_F_ONE_PACKET : 0; |
dff630dd | 535 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
1da177e4 | 536 | |
1da177e4 | 537 | /* create a new connection entry */ |
1e3e238e | 538 | IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); |
f11017ec SH |
539 | { |
540 | struct ip_vs_conn_param p; | |
d4383f04 JDB |
541 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
542 | &iph->saddr, pptr[0], | |
543 | &iph->daddr, pptr[1], &p); | |
f11017ec SH |
544 | cp = ip_vs_conn_new(&p, &daddr, 0, |
545 | IP_VS_CONN_F_BYPASS | flags, | |
0e051e68 | 546 | NULL, skb->mark); |
f11017ec SH |
547 | if (!cp) |
548 | return NF_DROP; | |
549 | } | |
1da177e4 LT |
550 | |
551 | /* statistics */ | |
552 | ip_vs_in_stats(cp, skb); | |
553 | ||
554 | /* set state */ | |
4a516f11 | 555 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 LT |
556 | |
557 | /* transmit the first SYN packet */ | |
d4383f04 | 558 | ret = cp->packet_xmit(skb, cp, pd->pp, iph); |
1da177e4 LT |
559 | /* do not touch skb anymore */ |
560 | ||
561 | atomic_inc(&cp->in_pkts); | |
562 | ip_vs_conn_put(cp); | |
563 | return ret; | |
564 | } | |
a7a86b86 | 565 | #endif |
1da177e4 LT |
566 | |
567 | /* | |
568 | * When the virtual ftp service is presented, packets destined | |
569 | * for other services on the VIP may get here (except services | |
570 | * listed in the ipvs table), pass the packets, because it is | |
571 | * not ipvs job to decide to drop the packets. | |
572 | */ | |
ceec4c38 | 573 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) |
1da177e4 | 574 | return NF_ACCEPT; |
1da177e4 LT |
575 | |
576 | /* | |
577 | * Notify the client that the destination is unreachable, and | |
578 | * release the socket buffer. | |
579 | * Since it is in IP layer, the TCP socket is not actually | |
580 | * created, the TCP RST packet cannot be sent, instead that | |
581 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
582 | */ | |
2a3b791e | 583 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f JA |
584 | if (svc->af == AF_INET6) { |
585 | if (!skb->dev) { | |
586 | struct net *net = dev_net(skb_dst(skb)->dev); | |
587 | ||
588 | skb->dev = net->loopback_dev; | |
589 | } | |
3ffe533c | 590 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
cb59155f | 591 | } else |
2a3b791e JV |
592 | #endif |
593 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
594 | ||
1da177e4 LT |
595 | return NF_DROP; |
596 | } | |
597 | ||
84b3cee3 SH |
598 | #ifdef CONFIG_SYSCTL |
599 | ||
600 | static int sysctl_snat_reroute(struct sk_buff *skb) | |
601 | { | |
602 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); | |
603 | return ipvs->sysctl_snat_reroute; | |
604 | } | |
605 | ||
0cfa558e SH |
606 | static int sysctl_nat_icmp_send(struct net *net) |
607 | { | |
608 | struct netns_ipvs *ipvs = net_ipvs(net); | |
609 | return ipvs->sysctl_nat_icmp_send; | |
610 | } | |
611 | ||
71a8ab6c SH |
612 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) |
613 | { | |
614 | return ipvs->sysctl_expire_nodest_conn; | |
615 | } | |
616 | ||
84b3cee3 SH |
617 | #else |
618 | ||
619 | static int sysctl_snat_reroute(struct sk_buff *skb) { return 0; } | |
0cfa558e | 620 | static int sysctl_nat_icmp_send(struct net *net) { return 0; } |
71a8ab6c | 621 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; } |
84b3cee3 SH |
622 | |
623 | #endif | |
624 | ||
b1550f22 | 625 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
1da177e4 | 626 | { |
d3bc23e7 | 627 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
1da177e4 LT |
628 | } |
629 | ||
1ca5bb54 JA |
630 | static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum) |
631 | { | |
632 | if (NF_INET_LOCAL_IN == hooknum) | |
633 | return IP_DEFRAG_VS_IN; | |
634 | if (NF_INET_FORWARD == hooknum) | |
635 | return IP_DEFRAG_VS_FWD; | |
636 | return IP_DEFRAG_VS_OUT; | |
637 | } | |
638 | ||
776c729e | 639 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
1da177e4 | 640 | { |
ac69269a | 641 | int err; |
776c729e | 642 | |
ac69269a JA |
643 | local_bh_disable(); |
644 | err = ip_defrag(skb, user); | |
645 | local_bh_enable(); | |
776c729e | 646 | if (!err) |
eddc9ec5 | 647 | ip_send_check(ip_hdr(skb)); |
776c729e HX |
648 | |
649 | return err; | |
1da177e4 LT |
650 | } |
651 | ||
ba4fd7e9 SH |
652 | static int ip_vs_route_me_harder(int af, struct sk_buff *skb) |
653 | { | |
ba4fd7e9 SH |
654 | #ifdef CONFIG_IP_VS_IPV6 |
655 | if (af == AF_INET6) { | |
84b3cee3 | 656 | if (sysctl_snat_reroute(skb) && ip6_route_me_harder(skb) != 0) |
ba4fd7e9 SH |
657 | return 1; |
658 | } else | |
659 | #endif | |
84b3cee3 | 660 | if ((sysctl_snat_reroute(skb) || |
ba4fd7e9 SH |
661 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) && |
662 | ip_route_me_harder(skb, RTN_LOCAL) != 0) | |
663 | return 1; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
1da177e4 LT |
668 | /* |
669 | * Packet has been made sufficiently writable in caller | |
670 | * - inout: 1=in->out, 0=out->in | |
671 | */ | |
672 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
673 | struct ip_vs_conn *cp, int inout) | |
674 | { | |
eddc9ec5 | 675 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 676 | unsigned int icmp_offset = iph->ihl*4; |
d56f90a7 ACM |
677 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
678 | icmp_offset); | |
1da177e4 LT |
679 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
680 | ||
681 | if (inout) { | |
e7ade46a | 682 | iph->saddr = cp->vaddr.ip; |
1da177e4 | 683 | ip_send_check(iph); |
e7ade46a | 684 | ciph->daddr = cp->vaddr.ip; |
1da177e4 LT |
685 | ip_send_check(ciph); |
686 | } else { | |
e7ade46a | 687 | iph->daddr = cp->daddr.ip; |
1da177e4 | 688 | ip_send_check(iph); |
e7ade46a | 689 | ciph->saddr = cp->daddr.ip; |
1da177e4 LT |
690 | ip_send_check(ciph); |
691 | } | |
692 | ||
2906f66a VMR |
693 | /* the TCP/UDP/SCTP port */ |
694 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || | |
695 | IPPROTO_SCTP == ciph->protocol) { | |
014d730d | 696 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
1da177e4 LT |
697 | |
698 | if (inout) | |
699 | ports[1] = cp->vport; | |
700 | else | |
701 | ports[0] = cp->dport; | |
702 | } | |
703 | ||
704 | /* And finally the ICMP checksum */ | |
705 | icmph->checksum = 0; | |
706 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
707 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
708 | ||
709 | if (inout) | |
0d79641a | 710 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
711 | "Forwarding altered outgoing ICMP"); |
712 | else | |
0d79641a | 713 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
714 | "Forwarding altered incoming ICMP"); |
715 | } | |
716 | ||
b3cdd2a7 JV |
717 | #ifdef CONFIG_IP_VS_IPV6 |
718 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
719 | struct ip_vs_conn *cp, int inout) | |
720 | { | |
721 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
63dca2c0 JDB |
722 | unsigned int icmp_offset = 0; |
723 | unsigned int offs = 0; /* header offset*/ | |
724 | int protocol; | |
725 | struct icmp6hdr *icmph; | |
726 | struct ipv6hdr *ciph; | |
727 | unsigned short fragoffs; | |
728 | ||
729 | ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL); | |
730 | icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset); | |
731 | offs = icmp_offset + sizeof(struct icmp6hdr); | |
732 | ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs); | |
733 | ||
734 | protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL); | |
b3cdd2a7 JV |
735 | |
736 | if (inout) { | |
737 | iph->saddr = cp->vaddr.in6; | |
738 | ciph->daddr = cp->vaddr.in6; | |
739 | } else { | |
740 | iph->daddr = cp->daddr.in6; | |
741 | ciph->saddr = cp->daddr.in6; | |
742 | } | |
743 | ||
2906f66a | 744 | /* the TCP/UDP/SCTP port */ |
63dca2c0 JDB |
745 | if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
746 | IPPROTO_SCTP == protocol)) { | |
747 | __be16 *ports = (void *)(skb_network_header(skb) + offs); | |
b3cdd2a7 | 748 | |
63dca2c0 JDB |
749 | IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__, |
750 | ntohs(inout ? ports[1] : ports[0]), | |
751 | ntohs(inout ? cp->vport : cp->dport)); | |
b3cdd2a7 JV |
752 | if (inout) |
753 | ports[1] = cp->vport; | |
754 | else | |
755 | ports[0] = cp->dport; | |
756 | } | |
757 | ||
758 | /* And finally the ICMP checksum */ | |
8870f842 SH |
759 | icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, |
760 | skb->len - icmp_offset, | |
761 | IPPROTO_ICMPV6, 0); | |
762 | skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset; | |
763 | skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); | |
764 | skb->ip_summed = CHECKSUM_PARTIAL; | |
b3cdd2a7 JV |
765 | |
766 | if (inout) | |
0d79641a JA |
767 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
768 | (void *)ciph - (void *)iph, | |
769 | "Forwarding altered outgoing ICMPv6"); | |
b3cdd2a7 | 770 | else |
0d79641a JA |
771 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
772 | (void *)ciph - (void *)iph, | |
773 | "Forwarding altered incoming ICMPv6"); | |
b3cdd2a7 JV |
774 | } |
775 | #endif | |
776 | ||
4856c84c | 777 | /* Handle relevant response ICMP messages - forward to the right |
6cb90db5 | 778 | * destination host. |
4856c84c | 779 | */ |
f2428ed5 SH |
780 | static int handle_response_icmp(int af, struct sk_buff *skb, |
781 | union nf_inet_addr *snet, | |
782 | __u8 protocol, struct ip_vs_conn *cp, | |
4856c84c MT |
783 | struct ip_vs_protocol *pp, |
784 | unsigned int offset, unsigned int ihl) | |
785 | { | |
786 | unsigned int verdict = NF_DROP; | |
787 | ||
788 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
1e3e238e HE |
789 | pr_err("shouldn't reach here, because the box is on the " |
790 | "half connection in the tun/dr module.\n"); | |
4856c84c MT |
791 | } |
792 | ||
793 | /* Ensure the checksum is correct */ | |
794 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
795 | /* Failed checksum! */ | |
f2428ed5 SH |
796 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
797 | IP_VS_DBG_ADDR(af, snet)); | |
4856c84c MT |
798 | goto out; |
799 | } | |
800 | ||
2906f66a VMR |
801 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
802 | IPPROTO_SCTP == protocol) | |
4856c84c MT |
803 | offset += 2 * sizeof(__u16); |
804 | if (!skb_make_writable(skb, offset)) | |
805 | goto out; | |
806 | ||
f2428ed5 SH |
807 | #ifdef CONFIG_IP_VS_IPV6 |
808 | if (af == AF_INET6) | |
809 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); | |
810 | else | |
811 | #endif | |
812 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
4856c84c | 813 | |
ba4fd7e9 SH |
814 | if (ip_vs_route_me_harder(af, skb)) |
815 | goto out; | |
f5a41847 | 816 | |
4856c84c MT |
817 | /* do the statistics and put it back */ |
818 | ip_vs_out_stats(cp, skb); | |
819 | ||
cf356d69 | 820 | skb->ipvs_property = 1; |
f4bc17cd | 821 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 822 | ip_vs_notrack(skb); |
f4bc17cd JA |
823 | else |
824 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
825 | verdict = NF_ACCEPT; |
826 | ||
827 | out: | |
828 | __ip_vs_conn_put(cp); | |
829 | ||
830 | return verdict; | |
831 | } | |
832 | ||
1da177e4 LT |
833 | /* |
834 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
4856c84c | 835 | * Find any that might be relevant, check against existing connections. |
1da177e4 | 836 | * Currently handles error types - unreachable, quench, ttl exceeded. |
1da177e4 | 837 | */ |
1ca5bb54 JA |
838 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related, |
839 | unsigned int hooknum) | |
1da177e4 | 840 | { |
1da177e4 LT |
841 | struct iphdr *iph; |
842 | struct icmphdr _icmph, *ic; | |
843 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 844 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
845 | struct ip_vs_conn *cp; |
846 | struct ip_vs_protocol *pp; | |
4856c84c | 847 | unsigned int offset, ihl; |
f2428ed5 | 848 | union nf_inet_addr snet; |
1da177e4 LT |
849 | |
850 | *related = 1; | |
851 | ||
852 | /* reassemble IP fragments */ | |
56f8a75c | 853 | if (ip_is_fragment(ip_hdr(skb))) { |
1ca5bb54 | 854 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 855 | return NF_STOLEN; |
1da177e4 LT |
856 | } |
857 | ||
eddc9ec5 | 858 | iph = ip_hdr(skb); |
1da177e4 LT |
859 | offset = ihl = iph->ihl * 4; |
860 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
861 | if (ic == NULL) | |
862 | return NF_DROP; | |
863 | ||
14d5e834 | 864 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 865 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 866 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
867 | |
868 | /* | |
869 | * Work through seeing if this is for us. | |
870 | * These checks are supposed to be in an order that means easy | |
871 | * things are checked first to speed up processing.... however | |
872 | * this means that some packets will manage to get a long way | |
873 | * down this stack and then be rejected, but that's life. | |
874 | */ | |
875 | if ((ic->type != ICMP_DEST_UNREACH) && | |
876 | (ic->type != ICMP_SOURCE_QUENCH) && | |
877 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
878 | *related = 0; | |
879 | return NF_ACCEPT; | |
880 | } | |
881 | ||
882 | /* Now find the contained IP header */ | |
883 | offset += sizeof(_icmph); | |
884 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
885 | if (cih == NULL) | |
886 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
887 | ||
888 | pp = ip_vs_proto_get(cih->protocol); | |
889 | if (!pp) | |
890 | return NF_ACCEPT; | |
891 | ||
892 | /* Is the embedded protocol header present? */ | |
4412ec49 | 893 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
894 | pp->dont_defrag)) |
895 | return NF_ACCEPT; | |
896 | ||
0d79641a JA |
897 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
898 | "Checking outgoing ICMP for"); | |
1da177e4 | 899 | |
63dca2c0 JDB |
900 | ip_vs_fill_ip4hdr(cih, &ciph); |
901 | ciph.len += offset; | |
1da177e4 | 902 | /* The embedded headers contain source and dest in reverse order */ |
d4383f04 | 903 | cp = pp->conn_out_get(AF_INET, skb, &ciph, 1); |
1da177e4 LT |
904 | if (!cp) |
905 | return NF_ACCEPT; | |
906 | ||
f2428ed5 SH |
907 | snet.ip = iph->saddr; |
908 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, | |
63dca2c0 | 909 | pp, ciph.len, ihl); |
1da177e4 LT |
910 | } |
911 | ||
2a3b791e | 912 | #ifdef CONFIG_IP_VS_IPV6 |
1ca5bb54 | 913 | static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, |
d4383f04 | 914 | unsigned int hooknum, struct ip_vs_iphdr *ipvsh) |
2a3b791e | 915 | { |
2a3b791e | 916 | struct icmp6hdr _icmph, *ic; |
63dca2c0 JDB |
917 | struct ipv6hdr _ip6h, *ip6h; /* The ip header contained within ICMP */ |
918 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ | |
2a3b791e JV |
919 | struct ip_vs_conn *cp; |
920 | struct ip_vs_protocol *pp; | |
f2428ed5 | 921 | union nf_inet_addr snet; |
63dca2c0 | 922 | unsigned int writable; |
2a3b791e | 923 | |
63dca2c0 | 924 | *related = 1; |
2f74713d | 925 | ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh); |
2a3b791e JV |
926 | if (ic == NULL) |
927 | return NF_DROP; | |
928 | ||
2a3b791e JV |
929 | /* |
930 | * Work through seeing if this is for us. | |
931 | * These checks are supposed to be in an order that means easy | |
932 | * things are checked first to speed up processing.... however | |
933 | * this means that some packets will manage to get a long way | |
934 | * down this stack and then be rejected, but that's life. | |
935 | */ | |
2fab8917 | 936 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
2a3b791e JV |
937 | *related = 0; |
938 | return NF_ACCEPT; | |
939 | } | |
2f74713d JDB |
940 | /* Fragment header that is before ICMP header tells us that: |
941 | * it's not an error message since they can't be fragmented. | |
942 | */ | |
e7165030 | 943 | if (ipvsh->flags & IP6_FH_F_FRAG) |
2f74713d | 944 | return NF_DROP; |
2a3b791e | 945 | |
63dca2c0 JDB |
946 | IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
947 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
948 | &ipvsh->saddr, &ipvsh->daddr); | |
949 | ||
2a3b791e | 950 | /* Now find the contained IP header */ |
63dca2c0 JDB |
951 | ciph.len = ipvsh->len + sizeof(_icmph); |
952 | ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); | |
953 | if (ip6h == NULL) | |
2a3b791e | 954 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
63dca2c0 JDB |
955 | ciph.saddr.in6 = ip6h->saddr; /* conn_out_get() handles reverse order */ |
956 | ciph.daddr.in6 = ip6h->daddr; | |
957 | /* skip possible IPv6 exthdrs of contained IPv6 packet */ | |
958 | ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); | |
959 | if (ciph.protocol < 0) | |
960 | return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ | |
961 | ||
962 | pp = ip_vs_proto_get(ciph.protocol); | |
2a3b791e JV |
963 | if (!pp) |
964 | return NF_ACCEPT; | |
965 | ||
2a3b791e | 966 | /* The embedded headers contain source and dest in reverse order */ |
d4383f04 | 967 | cp = pp->conn_out_get(AF_INET6, skb, &ciph, 1); |
2a3b791e JV |
968 | if (!cp) |
969 | return NF_ACCEPT; | |
970 | ||
63dca2c0 JDB |
971 | snet.in6 = ciph.saddr.in6; |
972 | writable = ciph.len; | |
973 | return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp, | |
974 | pp, writable, sizeof(struct ipv6hdr)); | |
2a3b791e JV |
975 | } |
976 | #endif | |
977 | ||
2906f66a VMR |
978 | /* |
979 | * Check if sctp chunc is ABORT chunk | |
980 | */ | |
981 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) | |
982 | { | |
983 | sctp_chunkhdr_t *sch, schunk; | |
984 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), | |
985 | sizeof(schunk), &schunk); | |
986 | if (sch == NULL) | |
987 | return 0; | |
988 | if (sch->type == SCTP_CID_ABORT) | |
989 | return 1; | |
990 | return 0; | |
991 | } | |
992 | ||
2a3b791e | 993 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
1da177e4 LT |
994 | { |
995 | struct tcphdr _tcph, *th; | |
996 | ||
2a3b791e | 997 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
1da177e4 LT |
998 | if (th == NULL) |
999 | return 0; | |
1000 | return th->rst; | |
1001 | } | |
1002 | ||
4856c84c | 1003 | /* Handle response packets: rewrite addresses and send away... |
4856c84c MT |
1004 | */ |
1005 | static unsigned int | |
9330419d | 1006 | handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, |
d4383f04 | 1007 | struct ip_vs_conn *cp, struct ip_vs_iphdr *iph) |
4856c84c | 1008 | { |
9330419d HS |
1009 | struct ip_vs_protocol *pp = pd->pp; |
1010 | ||
0d79641a | 1011 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet"); |
4856c84c | 1012 | |
d4383f04 | 1013 | if (!skb_make_writable(skb, iph->len)) |
4856c84c MT |
1014 | goto drop; |
1015 | ||
1016 | /* mangle the packet */ | |
d4383f04 | 1017 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph)) |
4856c84c MT |
1018 | goto drop; |
1019 | ||
1020 | #ifdef CONFIG_IP_VS_IPV6 | |
1021 | if (af == AF_INET6) | |
1022 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; | |
1023 | else | |
1024 | #endif | |
1025 | { | |
1026 | ip_hdr(skb)->saddr = cp->vaddr.ip; | |
1027 | ip_send_check(ip_hdr(skb)); | |
1028 | } | |
1029 | ||
8a803040 JA |
1030 | /* |
1031 | * nf_iterate does not expect change in the skb->dst->dev. | |
1032 | * It looks like it is not fatal to enable this code for hooks | |
1033 | * where our handlers are at the end of the chain list and | |
1034 | * when all next handlers use skb->dst->dev and not outdev. | |
1035 | * It will definitely route properly the inout NAT traffic | |
1036 | * when multiple paths are used. | |
1037 | */ | |
1038 | ||
4856c84c MT |
1039 | /* For policy routing, packets originating from this |
1040 | * machine itself may be routed differently to packets | |
1041 | * passing through. We want this packet to be routed as | |
1042 | * if it came from this machine itself. So re-compute | |
1043 | * the routing information. | |
1044 | */ | |
ba4fd7e9 SH |
1045 | if (ip_vs_route_me_harder(af, skb)) |
1046 | goto drop; | |
4856c84c | 1047 | |
0d79641a | 1048 | IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT"); |
4856c84c MT |
1049 | |
1050 | ip_vs_out_stats(cp, skb); | |
9330419d | 1051 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); |
cf356d69 | 1052 | skb->ipvs_property = 1; |
f4bc17cd | 1053 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 1054 | ip_vs_notrack(skb); |
f4bc17cd JA |
1055 | else |
1056 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
1057 | ip_vs_conn_put(cp); |
1058 | ||
4856c84c MT |
1059 | LeaveFunction(11); |
1060 | return NF_ACCEPT; | |
1061 | ||
1062 | drop: | |
1063 | ip_vs_conn_put(cp); | |
1064 | kfree_skb(skb); | |
f4bc17cd | 1065 | LeaveFunction(11); |
4856c84c MT |
1066 | return NF_STOLEN; |
1067 | } | |
1068 | ||
1da177e4 | 1069 | /* |
4856c84c | 1070 | * Check if outgoing packet belongs to the established ip_vs_conn. |
1da177e4 LT |
1071 | */ |
1072 | static unsigned int | |
fc604767 | 1073 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1074 | { |
fc723250 | 1075 | struct net *net = NULL; |
51ef348b | 1076 | struct ip_vs_iphdr iph; |
1da177e4 | 1077 | struct ip_vs_protocol *pp; |
9330419d | 1078 | struct ip_vs_proto_data *pd; |
1da177e4 | 1079 | struct ip_vs_conn *cp; |
1da177e4 LT |
1080 | |
1081 | EnterFunction(11); | |
1082 | ||
fc604767 | 1083 | /* Already marked as IPVS request or reply? */ |
6869c4d8 | 1084 | if (skb->ipvs_property) |
1da177e4 LT |
1085 | return NF_ACCEPT; |
1086 | ||
fc604767 JA |
1087 | /* Bad... Do not break raw sockets */ |
1088 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1089 | af == AF_INET)) { | |
1090 | struct sock *sk = skb->sk; | |
1091 | struct inet_sock *inet = inet_sk(skb->sk); | |
1092 | ||
1093 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1094 | return NF_ACCEPT; | |
1095 | } | |
1096 | ||
1097 | if (unlikely(!skb_dst(skb))) | |
1098 | return NF_ACCEPT; | |
1099 | ||
fc723250 | 1100 | net = skb_net(skb); |
7a4f0761 HS |
1101 | if (!net_ipvs(net)->enable) |
1102 | return NF_ACCEPT; | |
1103 | ||
63dca2c0 | 1104 | ip_vs_fill_iph_skb(af, skb, &iph); |
2a3b791e JV |
1105 | #ifdef CONFIG_IP_VS_IPV6 |
1106 | if (af == AF_INET6) { | |
2f74713d JDB |
1107 | if (!iph.fragoffs && skb_nfct_reasm(skb)) { |
1108 | struct sk_buff *reasm = skb_nfct_reasm(skb); | |
1109 | /* Save fw mark for coming frags */ | |
1110 | reasm->ipvs_property = 1; | |
1111 | reasm->mark = skb->mark; | |
1112 | } | |
2a3b791e | 1113 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { |
1ca5bb54 JA |
1114 | int related; |
1115 | int verdict = ip_vs_out_icmp_v6(skb, &related, | |
d4383f04 | 1116 | hooknum, &iph); |
1da177e4 | 1117 | |
f5a41847 | 1118 | if (related) |
2a3b791e | 1119 | return verdict; |
2a3b791e JV |
1120 | } |
1121 | } else | |
1122 | #endif | |
1123 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 JA |
1124 | int related; |
1125 | int verdict = ip_vs_out_icmp(skb, &related, hooknum); | |
2a3b791e | 1126 | |
f5a41847 | 1127 | if (related) |
2a3b791e | 1128 | return verdict; |
2a3b791e | 1129 | } |
1da177e4 | 1130 | |
9330419d HS |
1131 | pd = ip_vs_proto_data_get(net, iph.protocol); |
1132 | if (unlikely(!pd)) | |
1da177e4 | 1133 | return NF_ACCEPT; |
9330419d | 1134 | pp = pd->pp; |
1da177e4 LT |
1135 | |
1136 | /* reassemble IP fragments */ | |
2a3b791e | 1137 | #ifdef CONFIG_IP_VS_IPV6 |
63dca2c0 | 1138 | if (af == AF_INET) |
2a3b791e | 1139 | #endif |
56f8a75c | 1140 | if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) { |
1ca5bb54 JA |
1141 | if (ip_vs_gather_frags(skb, |
1142 | ip_vs_defrag_user(hooknum))) | |
2a3b791e JV |
1143 | return NF_STOLEN; |
1144 | ||
63dca2c0 | 1145 | ip_vs_fill_ip4hdr(skb_network_header(skb), &iph); |
2a3b791e | 1146 | } |
1da177e4 LT |
1147 | |
1148 | /* | |
1149 | * Check if the packet belongs to an existing entry | |
1150 | */ | |
d4383f04 | 1151 | cp = pp->conn_out_get(af, skb, &iph, 0); |
1da177e4 | 1152 | |
cb59155f | 1153 | if (likely(cp)) |
d4383f04 | 1154 | return handle_response(af, skb, pd, cp, &iph); |
0cfa558e | 1155 | if (sysctl_nat_icmp_send(net) && |
cb59155f JA |
1156 | (pp->protocol == IPPROTO_TCP || |
1157 | pp->protocol == IPPROTO_UDP || | |
1158 | pp->protocol == IPPROTO_SCTP)) { | |
1159 | __be16 _ports[2], *pptr; | |
1160 | ||
2f74713d JDB |
1161 | pptr = frag_safe_skb_hp(skb, iph.len, |
1162 | sizeof(_ports), _ports, &iph); | |
cb59155f JA |
1163 | if (pptr == NULL) |
1164 | return NF_ACCEPT; /* Not for me */ | |
276472ea JA |
1165 | if (ip_vs_has_real_service(net, af, iph.protocol, &iph.saddr, |
1166 | pptr[0])) { | |
cb59155f JA |
1167 | /* |
1168 | * Notify the real server: there is no | |
1169 | * existing entry if it is not RST | |
1170 | * packet or not TCP packet. | |
1171 | */ | |
1172 | if ((iph.protocol != IPPROTO_TCP && | |
1173 | iph.protocol != IPPROTO_SCTP) | |
1174 | || ((iph.protocol == IPPROTO_TCP | |
1175 | && !is_tcp_reset(skb, iph.len)) | |
1176 | || (iph.protocol == IPPROTO_SCTP | |
1177 | && !is_sctp_abort(skb, | |
1178 | iph.len)))) { | |
2a3b791e | 1179 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f | 1180 | if (af == AF_INET6) { |
cb59155f JA |
1181 | if (!skb->dev) |
1182 | skb->dev = net->loopback_dev; | |
1183 | icmpv6_send(skb, | |
1184 | ICMPV6_DEST_UNREACH, | |
1185 | ICMPV6_PORT_UNREACH, | |
1186 | 0); | |
1187 | } else | |
2a3b791e | 1188 | #endif |
cb59155f JA |
1189 | icmp_send(skb, |
1190 | ICMP_DEST_UNREACH, | |
1191 | ICMP_PORT_UNREACH, 0); | |
1192 | return NF_DROP; | |
1da177e4 LT |
1193 | } |
1194 | } | |
1da177e4 | 1195 | } |
0d79641a | 1196 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
cb59155f JA |
1197 | "ip_vs_out: packet continues traversal as normal"); |
1198 | return NF_ACCEPT; | |
1da177e4 LT |
1199 | } |
1200 | ||
fc604767 | 1201 | /* |
cb59155f JA |
1202 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1203 | * used only for VS/NAT. | |
fc604767 JA |
1204 | * Check if packet is reply for established ip_vs_conn. |
1205 | */ | |
1206 | static unsigned int | |
1207 | ip_vs_reply4(unsigned int hooknum, struct sk_buff *skb, | |
1208 | const struct net_device *in, const struct net_device *out, | |
1209 | int (*okfn)(struct sk_buff *)) | |
1210 | { | |
1211 | return ip_vs_out(hooknum, skb, AF_INET); | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1216 | * Check if packet is reply for established ip_vs_conn. | |
1217 | */ | |
1218 | static unsigned int | |
1219 | ip_vs_local_reply4(unsigned int hooknum, struct sk_buff *skb, | |
1220 | const struct net_device *in, const struct net_device *out, | |
1221 | int (*okfn)(struct sk_buff *)) | |
1222 | { | |
ac69269a | 1223 | return ip_vs_out(hooknum, skb, AF_INET); |
fc604767 JA |
1224 | } |
1225 | ||
1226 | #ifdef CONFIG_IP_VS_IPV6 | |
1227 | ||
1228 | /* | |
cb59155f JA |
1229 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1230 | * used only for VS/NAT. | |
fc604767 JA |
1231 | * Check if packet is reply for established ip_vs_conn. |
1232 | */ | |
1233 | static unsigned int | |
1234 | ip_vs_reply6(unsigned int hooknum, struct sk_buff *skb, | |
1235 | const struct net_device *in, const struct net_device *out, | |
1236 | int (*okfn)(struct sk_buff *)) | |
1237 | { | |
1238 | return ip_vs_out(hooknum, skb, AF_INET6); | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1243 | * Check if packet is reply for established ip_vs_conn. | |
1244 | */ | |
1245 | static unsigned int | |
1246 | ip_vs_local_reply6(unsigned int hooknum, struct sk_buff *skb, | |
1247 | const struct net_device *in, const struct net_device *out, | |
1248 | int (*okfn)(struct sk_buff *)) | |
1249 | { | |
ac69269a | 1250 | return ip_vs_out(hooknum, skb, AF_INET6); |
fc604767 JA |
1251 | } |
1252 | ||
1253 | #endif | |
1da177e4 LT |
1254 | |
1255 | /* | |
1256 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
1257 | * Find any that might be relevant, check against existing connections, | |
1258 | * forward to the right destination host if relevant. | |
1259 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
1260 | */ | |
e905a9ed | 1261 | static int |
3db05fea | 1262 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
1da177e4 | 1263 | { |
9330419d | 1264 | struct net *net = NULL; |
1da177e4 LT |
1265 | struct iphdr *iph; |
1266 | struct icmphdr _icmph, *ic; | |
1267 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 1268 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
1269 | struct ip_vs_conn *cp; |
1270 | struct ip_vs_protocol *pp; | |
9330419d | 1271 | struct ip_vs_proto_data *pd; |
f2edb9f7 JA |
1272 | unsigned int offset, offset2, ihl, verdict; |
1273 | bool ipip; | |
1da177e4 LT |
1274 | |
1275 | *related = 1; | |
1276 | ||
1277 | /* reassemble IP fragments */ | |
56f8a75c | 1278 | if (ip_is_fragment(ip_hdr(skb))) { |
1ca5bb54 | 1279 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 1280 | return NF_STOLEN; |
1da177e4 LT |
1281 | } |
1282 | ||
eddc9ec5 | 1283 | iph = ip_hdr(skb); |
1da177e4 LT |
1284 | offset = ihl = iph->ihl * 4; |
1285 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1286 | if (ic == NULL) | |
1287 | return NF_DROP; | |
1288 | ||
14d5e834 | 1289 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 1290 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 1291 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
1292 | |
1293 | /* | |
1294 | * Work through seeing if this is for us. | |
1295 | * These checks are supposed to be in an order that means easy | |
1296 | * things are checked first to speed up processing.... however | |
1297 | * this means that some packets will manage to get a long way | |
1298 | * down this stack and then be rejected, but that's life. | |
1299 | */ | |
1300 | if ((ic->type != ICMP_DEST_UNREACH) && | |
1301 | (ic->type != ICMP_SOURCE_QUENCH) && | |
1302 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
1303 | *related = 0; | |
1304 | return NF_ACCEPT; | |
1305 | } | |
1306 | ||
1307 | /* Now find the contained IP header */ | |
1308 | offset += sizeof(_icmph); | |
1309 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1310 | if (cih == NULL) | |
1311 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1312 | ||
9330419d | 1313 | net = skb_net(skb); |
7a4f0761 | 1314 | |
f2edb9f7 JA |
1315 | /* Special case for errors for IPIP packets */ |
1316 | ipip = false; | |
1317 | if (cih->protocol == IPPROTO_IPIP) { | |
1318 | if (unlikely(cih->frag_off & htons(IP_OFFSET))) | |
1319 | return NF_ACCEPT; | |
1320 | /* Error for our IPIP must arrive at LOCAL_IN */ | |
1321 | if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL)) | |
1322 | return NF_ACCEPT; | |
1323 | offset += cih->ihl * 4; | |
1324 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1325 | if (cih == NULL) | |
1326 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1327 | ipip = true; | |
1328 | } | |
1329 | ||
9330419d HS |
1330 | pd = ip_vs_proto_data_get(net, cih->protocol); |
1331 | if (!pd) | |
1da177e4 | 1332 | return NF_ACCEPT; |
9330419d | 1333 | pp = pd->pp; |
1da177e4 LT |
1334 | |
1335 | /* Is the embedded protocol header present? */ | |
4412ec49 | 1336 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
1337 | pp->dont_defrag)) |
1338 | return NF_ACCEPT; | |
1339 | ||
0d79641a JA |
1340 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
1341 | "Checking incoming ICMP for"); | |
1da177e4 | 1342 | |
f2edb9f7 | 1343 | offset2 = offset; |
63dca2c0 JDB |
1344 | ip_vs_fill_ip4hdr(cih, &ciph); |
1345 | ciph.len += offset; | |
1346 | offset = ciph.len; | |
f2edb9f7 JA |
1347 | /* The embedded headers contain source and dest in reverse order. |
1348 | * For IPIP this is error for request, not for reply. | |
1349 | */ | |
d4383f04 | 1350 | cp = pp->conn_in_get(AF_INET, skb, &ciph, ipip ? 0 : 1); |
6cb90db5 | 1351 | if (!cp) |
1da177e4 LT |
1352 | return NF_ACCEPT; |
1353 | ||
1354 | verdict = NF_DROP; | |
1355 | ||
1356 | /* Ensure the checksum is correct */ | |
60476372 | 1357 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 | 1358 | /* Failed checksum! */ |
14d5e834 HH |
1359 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
1360 | &iph->saddr); | |
1da177e4 LT |
1361 | goto out; |
1362 | } | |
1363 | ||
f2edb9f7 JA |
1364 | if (ipip) { |
1365 | __be32 info = ic->un.gateway; | |
1366 | ||
1367 | /* Update the MTU */ | |
1368 | if (ic->type == ICMP_DEST_UNREACH && | |
1369 | ic->code == ICMP_FRAG_NEEDED) { | |
1370 | struct ip_vs_dest *dest = cp->dest; | |
1371 | u32 mtu = ntohs(ic->un.frag.mtu); | |
1372 | ||
1373 | /* Strip outer IP and ICMP, go to IPIP header */ | |
1374 | __skb_pull(skb, ihl + sizeof(_icmph)); | |
1375 | offset2 -= ihl + sizeof(_icmph); | |
1376 | skb_reset_network_header(skb); | |
1377 | IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n", | |
1378 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu); | |
f2edb9f7 JA |
1379 | ipv4_update_pmtu(skb, dev_net(skb->dev), |
1380 | mtu, 0, 0, 0, 0); | |
f2edb9f7 JA |
1381 | /* Client uses PMTUD? */ |
1382 | if (!(cih->frag_off & htons(IP_DF))) | |
1383 | goto ignore_ipip; | |
1384 | /* Prefer the resulting PMTU */ | |
1385 | if (dest) { | |
026ace06 JA |
1386 | struct ip_vs_dest_dst *dest_dst; |
1387 | ||
1388 | rcu_read_lock(); | |
1389 | dest_dst = rcu_dereference(dest->dest_dst); | |
1390 | if (dest_dst) | |
1391 | mtu = dst_mtu(dest_dst->dst_cache); | |
1392 | rcu_read_unlock(); | |
f2edb9f7 JA |
1393 | } |
1394 | if (mtu > 68 + sizeof(struct iphdr)) | |
1395 | mtu -= sizeof(struct iphdr); | |
1396 | info = htonl(mtu); | |
1397 | } | |
1398 | /* Strip outer IP, ICMP and IPIP, go to IP header of | |
1399 | * original request. | |
1400 | */ | |
1401 | __skb_pull(skb, offset2); | |
1402 | skb_reset_network_header(skb); | |
1403 | IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n", | |
1404 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1405 | ic->type, ic->code, ntohl(info)); | |
1406 | icmp_send(skb, ic->type, ic->code, info); | |
1407 | /* ICMP can be shorter but anyways, account it */ | |
1408 | ip_vs_out_stats(cp, skb); | |
1409 | ||
1410 | ignore_ipip: | |
1411 | consume_skb(skb); | |
1412 | verdict = NF_STOLEN; | |
1413 | goto out; | |
1414 | } | |
1415 | ||
1da177e4 LT |
1416 | /* do the statistics and put it back */ |
1417 | ip_vs_in_stats(cp, skb); | |
1418 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) | |
1419 | offset += 2 * sizeof(__u16); | |
d4383f04 | 1420 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph); |
1da177e4 | 1421 | |
552ad65a | 1422 | out: |
1da177e4 LT |
1423 | __ip_vs_conn_put(cp); |
1424 | ||
1425 | return verdict; | |
1426 | } | |
1427 | ||
2a3b791e | 1428 | #ifdef CONFIG_IP_VS_IPV6 |
d4383f04 JDB |
1429 | static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, |
1430 | unsigned int hooknum, struct ip_vs_iphdr *iph) | |
2a3b791e | 1431 | { |
9330419d | 1432 | struct net *net = NULL; |
63dca2c0 | 1433 | struct ipv6hdr _ip6h, *ip6h; |
2a3b791e | 1434 | struct icmp6hdr _icmph, *ic; |
63dca2c0 | 1435 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
2a3b791e JV |
1436 | struct ip_vs_conn *cp; |
1437 | struct ip_vs_protocol *pp; | |
9330419d | 1438 | struct ip_vs_proto_data *pd; |
63dca2c0 | 1439 | unsigned int offs_ciph, writable, verdict; |
2a3b791e | 1440 | |
63dca2c0 | 1441 | *related = 1; |
2a3b791e | 1442 | |
2f74713d | 1443 | ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph, iph); |
2a3b791e JV |
1444 | if (ic == NULL) |
1445 | return NF_DROP; | |
1446 | ||
2a3b791e JV |
1447 | /* |
1448 | * Work through seeing if this is for us. | |
1449 | * These checks are supposed to be in an order that means easy | |
1450 | * things are checked first to speed up processing.... however | |
1451 | * this means that some packets will manage to get a long way | |
1452 | * down this stack and then be rejected, but that's life. | |
1453 | */ | |
2fab8917 | 1454 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
2a3b791e JV |
1455 | *related = 0; |
1456 | return NF_ACCEPT; | |
1457 | } | |
2f74713d JDB |
1458 | /* Fragment header that is before ICMP header tells us that: |
1459 | * it's not an error message since they can't be fragmented. | |
1460 | */ | |
e7165030 | 1461 | if (iph->flags & IP6_FH_F_FRAG) |
2f74713d | 1462 | return NF_DROP; |
2a3b791e | 1463 | |
63dca2c0 JDB |
1464 | IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
1465 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
1466 | &iph->saddr, &iph->daddr); | |
1467 | ||
2a3b791e | 1468 | /* Now find the contained IP header */ |
63dca2c0 JDB |
1469 | ciph.len = iph->len + sizeof(_icmph); |
1470 | offs_ciph = ciph.len; /* Save ip header offset */ | |
1471 | ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); | |
1472 | if (ip6h == NULL) | |
2a3b791e | 1473 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
63dca2c0 JDB |
1474 | ciph.saddr.in6 = ip6h->saddr; /* conn_in_get() handles reverse order */ |
1475 | ciph.daddr.in6 = ip6h->daddr; | |
1476 | /* skip possible IPv6 exthdrs of contained IPv6 packet */ | |
1477 | ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); | |
1478 | if (ciph.protocol < 0) | |
1479 | return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ | |
2a3b791e | 1480 | |
9330419d | 1481 | net = skb_net(skb); |
63dca2c0 | 1482 | pd = ip_vs_proto_data_get(net, ciph.protocol); |
9330419d | 1483 | if (!pd) |
2a3b791e | 1484 | return NF_ACCEPT; |
9330419d | 1485 | pp = pd->pp; |
2a3b791e | 1486 | |
63dca2c0 JDB |
1487 | /* Cannot handle fragmented embedded protocol */ |
1488 | if (ciph.fragoffs) | |
2a3b791e JV |
1489 | return NF_ACCEPT; |
1490 | ||
63dca2c0 | 1491 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offs_ciph, |
0d79641a | 1492 | "Checking incoming ICMPv6 for"); |
2a3b791e | 1493 | |
2f74713d JDB |
1494 | /* The embedded headers contain source and dest in reverse order |
1495 | * if not from localhost | |
1496 | */ | |
d4383f04 | 1497 | cp = pp->conn_in_get(AF_INET6, skb, &ciph, |
2f74713d JDB |
1498 | (hooknum == NF_INET_LOCAL_OUT) ? 0 : 1); |
1499 | ||
6cb90db5 | 1500 | if (!cp) |
2a3b791e | 1501 | return NF_ACCEPT; |
2f74713d JDB |
1502 | /* VS/TUN, VS/DR and LOCALNODE just let it go */ |
1503 | if ((hooknum == NF_INET_LOCAL_OUT) && | |
1504 | (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) { | |
1505 | __ip_vs_conn_put(cp); | |
1506 | return NF_ACCEPT; | |
1507 | } | |
2a3b791e | 1508 | |
2a3b791e JV |
1509 | /* do the statistics and put it back */ |
1510 | ip_vs_in_stats(cp, skb); | |
63dca2c0 JDB |
1511 | |
1512 | /* Need to mangle contained IPv6 header in ICMPv6 packet */ | |
1513 | writable = ciph.len; | |
1514 | if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol || | |
1515 | IPPROTO_SCTP == ciph.protocol) | |
1516 | writable += 2 * sizeof(__u16); /* Also mangle ports */ | |
1517 | ||
d4383f04 | 1518 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, writable, hooknum, &ciph); |
2a3b791e JV |
1519 | |
1520 | __ip_vs_conn_put(cp); | |
1521 | ||
1522 | return verdict; | |
1523 | } | |
1524 | #endif | |
1525 | ||
1526 | ||
1da177e4 LT |
1527 | /* |
1528 | * Check if it's for virtual services, look it up, | |
1529 | * and send it on its way... | |
1530 | */ | |
1531 | static unsigned int | |
cb59155f | 1532 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1533 | { |
f131315f | 1534 | struct net *net; |
51ef348b | 1535 | struct ip_vs_iphdr iph; |
1da177e4 | 1536 | struct ip_vs_protocol *pp; |
9330419d | 1537 | struct ip_vs_proto_data *pd; |
1da177e4 | 1538 | struct ip_vs_conn *cp; |
4a516f11 | 1539 | int ret, pkts; |
f131315f | 1540 | struct netns_ipvs *ipvs; |
2a3b791e | 1541 | |
fc604767 JA |
1542 | /* Already marked as IPVS request or reply? */ |
1543 | if (skb->ipvs_property) | |
1544 | return NF_ACCEPT; | |
1545 | ||
1da177e4 | 1546 | /* |
cb59155f JA |
1547 | * Big tappo: |
1548 | * - remote client: only PACKET_HOST | |
1549 | * - route: used for struct net when skb->dev is unset | |
1da177e4 | 1550 | */ |
cb59155f JA |
1551 | if (unlikely((skb->pkt_type != PACKET_HOST && |
1552 | hooknum != NF_INET_LOCAL_OUT) || | |
1553 | !skb_dst(skb))) { | |
63dca2c0 | 1554 | ip_vs_fill_iph_skb(af, skb, &iph); |
cb59155f JA |
1555 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s" |
1556 | " ignored in hook %u\n", | |
1557 | skb->pkt_type, iph.protocol, | |
1558 | IP_VS_DBG_ADDR(af, &iph.daddr), hooknum); | |
1da177e4 LT |
1559 | return NF_ACCEPT; |
1560 | } | |
7a4f0761 HS |
1561 | /* ipvs enabled in this netns ? */ |
1562 | net = skb_net(skb); | |
0c12582f JA |
1563 | ipvs = net_ipvs(net); |
1564 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1565 | return NF_ACCEPT; |
1566 | ||
63dca2c0 | 1567 | ip_vs_fill_iph_skb(af, skb, &iph); |
cb59155f JA |
1568 | |
1569 | /* Bad... Do not break raw sockets */ | |
1570 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1571 | af == AF_INET)) { | |
1572 | struct sock *sk = skb->sk; | |
1573 | struct inet_sock *inet = inet_sk(skb->sk); | |
1574 | ||
1575 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1576 | return NF_ACCEPT; | |
1577 | } | |
1da177e4 | 1578 | |
94b26551 JV |
1579 | #ifdef CONFIG_IP_VS_IPV6 |
1580 | if (af == AF_INET6) { | |
2f74713d JDB |
1581 | if (!iph.fragoffs && skb_nfct_reasm(skb)) { |
1582 | struct sk_buff *reasm = skb_nfct_reasm(skb); | |
1583 | /* Save fw mark for coming frags. */ | |
1584 | reasm->ipvs_property = 1; | |
1585 | reasm->mark = skb->mark; | |
1586 | } | |
94b26551 | 1587 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { |
1ca5bb54 | 1588 | int related; |
d4383f04 JDB |
1589 | int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum, |
1590 | &iph); | |
1da177e4 | 1591 | |
94b26551 JV |
1592 | if (related) |
1593 | return verdict; | |
94b26551 JV |
1594 | } |
1595 | } else | |
1596 | #endif | |
1597 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 JA |
1598 | int related; |
1599 | int verdict = ip_vs_in_icmp(skb, &related, hooknum); | |
94b26551 JV |
1600 | |
1601 | if (related) | |
1602 | return verdict; | |
94b26551 | 1603 | } |
1da177e4 LT |
1604 | |
1605 | /* Protocol supported? */ | |
9330419d HS |
1606 | pd = ip_vs_proto_data_get(net, iph.protocol); |
1607 | if (unlikely(!pd)) | |
1da177e4 | 1608 | return NF_ACCEPT; |
9330419d | 1609 | pp = pd->pp; |
1da177e4 LT |
1610 | /* |
1611 | * Check if the packet belongs to an existing connection entry | |
1612 | */ | |
d4383f04 | 1613 | cp = pp->conn_in_get(af, skb, &iph, 0); |
63dca2c0 | 1614 | if (unlikely(!cp) && !iph.fragoffs) { |
2f74713d JDB |
1615 | /* No (second) fragments need to enter here, as nf_defrag_ipv6 |
1616 | * replayed fragment zero will already have created the cp | |
1617 | */ | |
1da177e4 LT |
1618 | int v; |
1619 | ||
2f74713d | 1620 | /* Schedule and create new connection entry into &cp */ |
d4383f04 | 1621 | if (!pp->conn_schedule(af, skb, pd, &v, &cp, &iph)) |
1da177e4 LT |
1622 | return v; |
1623 | } | |
1624 | ||
1625 | if (unlikely(!cp)) { | |
1626 | /* sorry, all this trouble for a no-hit :) */ | |
0d79641a | 1627 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
cb59155f | 1628 | "ip_vs_in: packet continues traversal as normal"); |
2f74713d JDB |
1629 | if (iph.fragoffs && !skb_nfct_reasm(skb)) { |
1630 | /* Fragment that couldn't be mapped to a conn entry | |
1631 | * and don't have any pointer to a reasm skb | |
1632 | * is missing module nf_defrag_ipv6 | |
1633 | */ | |
1634 | IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n"); | |
1635 | IP_VS_DBG_PKT(7, af, pp, skb, 0, "unhandled fragment"); | |
1636 | } | |
1da177e4 LT |
1637 | return NF_ACCEPT; |
1638 | } | |
1639 | ||
0d79641a | 1640 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet"); |
1da177e4 LT |
1641 | /* Check the server status */ |
1642 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
1643 | /* the destination server is not available */ | |
1644 | ||
71a8ab6c | 1645 | if (sysctl_expire_nodest_conn(ipvs)) { |
1da177e4 LT |
1646 | /* try to expire the connection immediately */ |
1647 | ip_vs_conn_expire_now(cp); | |
1da177e4 | 1648 | } |
dc8103f2 JA |
1649 | /* don't restart its timer, and silently |
1650 | drop the packet. */ | |
1651 | __ip_vs_conn_put(cp); | |
1da177e4 LT |
1652 | return NF_DROP; |
1653 | } | |
1654 | ||
1655 | ip_vs_in_stats(cp, skb); | |
4a516f11 | 1656 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 | 1657 | if (cp->packet_xmit) |
d4383f04 | 1658 | ret = cp->packet_xmit(skb, cp, pp, &iph); |
1da177e4 LT |
1659 | /* do not touch skb anymore */ |
1660 | else { | |
1661 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
1662 | ret = NF_ACCEPT; | |
1663 | } | |
1664 | ||
efac5276 RB |
1665 | /* Increase its packet counter and check if it is needed |
1666 | * to be synchronized | |
1667 | * | |
1668 | * Sync connection if it is about to close to | |
1669 | * encorage the standby servers to update the connections timeout | |
986a0757 HS |
1670 | * |
1671 | * For ONE_PKT let ip_vs_sync_conn() do the filter work. | |
efac5276 | 1672 | */ |
f131315f | 1673 | |
986a0757 | 1674 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
59e0350e | 1675 | pkts = sysctl_sync_threshold(ipvs); |
986a0757 HS |
1676 | else |
1677 | pkts = atomic_add_return(1, &cp->in_pkts); | |
1678 | ||
749c42b6 JA |
1679 | if (ipvs->sync_state & IP_VS_STATE_MASTER) |
1680 | ip_vs_sync_conn(net, cp, pkts); | |
1da177e4 LT |
1681 | |
1682 | ip_vs_conn_put(cp); | |
1683 | return ret; | |
1684 | } | |
1685 | ||
cb59155f JA |
1686 | /* |
1687 | * AF_INET handler in NF_INET_LOCAL_IN chain | |
1688 | * Schedule and forward packets from remote clients | |
1689 | */ | |
1690 | static unsigned int | |
1691 | ip_vs_remote_request4(unsigned int hooknum, struct sk_buff *skb, | |
1692 | const struct net_device *in, | |
1693 | const struct net_device *out, | |
1694 | int (*okfn)(struct sk_buff *)) | |
1695 | { | |
1696 | return ip_vs_in(hooknum, skb, AF_INET); | |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | * AF_INET handler in NF_INET_LOCAL_OUT chain | |
1701 | * Schedule and forward packets from local clients | |
1702 | */ | |
1703 | static unsigned int | |
1704 | ip_vs_local_request4(unsigned int hooknum, struct sk_buff *skb, | |
1705 | const struct net_device *in, const struct net_device *out, | |
1706 | int (*okfn)(struct sk_buff *)) | |
1707 | { | |
ac69269a | 1708 | return ip_vs_in(hooknum, skb, AF_INET); |
cb59155f JA |
1709 | } |
1710 | ||
1711 | #ifdef CONFIG_IP_VS_IPV6 | |
1712 | ||
2f74713d JDB |
1713 | /* |
1714 | * AF_INET6 fragment handling | |
1715 | * Copy info from first fragment, to the rest of them. | |
1716 | */ | |
1717 | static unsigned int | |
1718 | ip_vs_preroute_frag6(unsigned int hooknum, struct sk_buff *skb, | |
1719 | const struct net_device *in, | |
1720 | const struct net_device *out, | |
1721 | int (*okfn)(struct sk_buff *)) | |
1722 | { | |
1723 | struct sk_buff *reasm = skb_nfct_reasm(skb); | |
1724 | struct net *net; | |
1725 | ||
1726 | /* Skip if not a "replay" from nf_ct_frag6_output or first fragment. | |
1727 | * ipvs_property is set when checking first fragment | |
1728 | * in ip_vs_in() and ip_vs_out(). | |
1729 | */ | |
1730 | if (reasm) | |
1731 | IP_VS_DBG(2, "Fragment recv prop:%d\n", reasm->ipvs_property); | |
1732 | if (!reasm || !reasm->ipvs_property) | |
1733 | return NF_ACCEPT; | |
1734 | ||
1735 | net = skb_net(skb); | |
1736 | if (!net_ipvs(net)->enable) | |
1737 | return NF_ACCEPT; | |
1738 | ||
1739 | /* Copy stored fw mark, saved in ip_vs_{in,out} */ | |
1740 | skb->mark = reasm->mark; | |
1741 | ||
1742 | return NF_ACCEPT; | |
1743 | } | |
1744 | ||
cb59155f JA |
1745 | /* |
1746 | * AF_INET6 handler in NF_INET_LOCAL_IN chain | |
1747 | * Schedule and forward packets from remote clients | |
1748 | */ | |
1749 | static unsigned int | |
1750 | ip_vs_remote_request6(unsigned int hooknum, struct sk_buff *skb, | |
1751 | const struct net_device *in, | |
1752 | const struct net_device *out, | |
1753 | int (*okfn)(struct sk_buff *)) | |
1754 | { | |
1755 | return ip_vs_in(hooknum, skb, AF_INET6); | |
1756 | } | |
1757 | ||
1758 | /* | |
1759 | * AF_INET6 handler in NF_INET_LOCAL_OUT chain | |
1760 | * Schedule and forward packets from local clients | |
1761 | */ | |
1762 | static unsigned int | |
1763 | ip_vs_local_request6(unsigned int hooknum, struct sk_buff *skb, | |
1764 | const struct net_device *in, const struct net_device *out, | |
1765 | int (*okfn)(struct sk_buff *)) | |
1766 | { | |
ac69269a | 1767 | return ip_vs_in(hooknum, skb, AF_INET6); |
cb59155f JA |
1768 | } |
1769 | ||
1770 | #endif | |
1771 | ||
1da177e4 LT |
1772 | |
1773 | /* | |
6e23ae2a | 1774 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
1da177e4 LT |
1775 | * related packets destined for 0.0.0.0/0. |
1776 | * When fwmark-based virtual service is used, such as transparent | |
1777 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1778 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
6e23ae2a | 1779 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
1da177e4 LT |
1780 | * and send them to ip_vs_in_icmp. |
1781 | */ | |
1782 | static unsigned int | |
3db05fea | 1783 | ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
1784 | const struct net_device *in, const struct net_device *out, |
1785 | int (*okfn)(struct sk_buff *)) | |
1786 | { | |
1787 | int r; | |
7a4f0761 | 1788 | struct net *net; |
0c12582f | 1789 | struct netns_ipvs *ipvs; |
1da177e4 | 1790 | |
3db05fea | 1791 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
1da177e4 LT |
1792 | return NF_ACCEPT; |
1793 | ||
7a4f0761 HS |
1794 | /* ipvs enabled in this netns ? */ |
1795 | net = skb_net(skb); | |
0c12582f JA |
1796 | ipvs = net_ipvs(net); |
1797 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1798 | return NF_ACCEPT; |
1799 | ||
3db05fea | 1800 | return ip_vs_in_icmp(skb, &r, hooknum); |
1da177e4 LT |
1801 | } |
1802 | ||
2a3b791e JV |
1803 | #ifdef CONFIG_IP_VS_IPV6 |
1804 | static unsigned int | |
1805 | ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb, | |
1806 | const struct net_device *in, const struct net_device *out, | |
1807 | int (*okfn)(struct sk_buff *)) | |
1808 | { | |
1809 | int r; | |
7a4f0761 | 1810 | struct net *net; |
0c12582f | 1811 | struct netns_ipvs *ipvs; |
63dca2c0 | 1812 | struct ip_vs_iphdr iphdr; |
2a3b791e | 1813 | |
63dca2c0 JDB |
1814 | ip_vs_fill_iph_skb(AF_INET6, skb, &iphdr); |
1815 | if (iphdr.protocol != IPPROTO_ICMPV6) | |
2a3b791e JV |
1816 | return NF_ACCEPT; |
1817 | ||
7a4f0761 HS |
1818 | /* ipvs enabled in this netns ? */ |
1819 | net = skb_net(skb); | |
0c12582f JA |
1820 | ipvs = net_ipvs(net); |
1821 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1822 | return NF_ACCEPT; |
1823 | ||
d4383f04 | 1824 | return ip_vs_in_icmp_v6(skb, &r, hooknum, &iphdr); |
2a3b791e JV |
1825 | } |
1826 | #endif | |
1827 | ||
1da177e4 | 1828 | |
1999414a | 1829 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
cb59155f JA |
1830 | /* After packet filtering, change source only for VS/NAT */ |
1831 | { | |
1832 | .hook = ip_vs_reply4, | |
1833 | .owner = THIS_MODULE, | |
4c809d63 | 1834 | .pf = NFPROTO_IPV4, |
cb59155f | 1835 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1836 | .priority = NF_IP_PRI_NAT_SRC - 2, |
cb59155f | 1837 | }, |
41c5b317 PM |
1838 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1839 | * or VS/NAT(change destination), so that filtering rules can be | |
1840 | * applied to IPVS. */ | |
1841 | { | |
cb59155f | 1842 | .hook = ip_vs_remote_request4, |
41c5b317 | 1843 | .owner = THIS_MODULE, |
4c809d63 | 1844 | .pf = NFPROTO_IPV4, |
cb59155f | 1845 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1846 | .priority = NF_IP_PRI_NAT_SRC - 1, |
41c5b317 | 1847 | }, |
fc604767 | 1848 | /* Before ip_vs_in, change source only for VS/NAT */ |
41c5b317 | 1849 | { |
fc604767 | 1850 | .hook = ip_vs_local_reply4, |
41c5b317 | 1851 | .owner = THIS_MODULE, |
4c809d63 | 1852 | .pf = NFPROTO_IPV4, |
fc604767 | 1853 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1854 | .priority = NF_IP_PRI_NAT_DST + 1, |
41c5b317 | 1855 | }, |
cb59155f JA |
1856 | /* After mangle, schedule and forward local requests */ |
1857 | { | |
1858 | .hook = ip_vs_local_request4, | |
1859 | .owner = THIS_MODULE, | |
4c809d63 | 1860 | .pf = NFPROTO_IPV4, |
cb59155f | 1861 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1862 | .priority = NF_IP_PRI_NAT_DST + 2, |
cb59155f | 1863 | }, |
41c5b317 PM |
1864 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1865 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1866 | { | |
1867 | .hook = ip_vs_forward_icmp, | |
1868 | .owner = THIS_MODULE, | |
4c809d63 | 1869 | .pf = NFPROTO_IPV4, |
cb59155f JA |
1870 | .hooknum = NF_INET_FORWARD, |
1871 | .priority = 99, | |
41c5b317 | 1872 | }, |
fc604767 JA |
1873 | /* After packet filtering, change source only for VS/NAT */ |
1874 | { | |
1875 | .hook = ip_vs_reply4, | |
1876 | .owner = THIS_MODULE, | |
4c809d63 | 1877 | .pf = NFPROTO_IPV4, |
fc604767 JA |
1878 | .hooknum = NF_INET_FORWARD, |
1879 | .priority = 100, | |
1880 | }, | |
473b23d3 | 1881 | #ifdef CONFIG_IP_VS_IPV6 |
2f74713d JDB |
1882 | /* After mangle & nat fetch 2:nd fragment and following */ |
1883 | { | |
1884 | .hook = ip_vs_preroute_frag6, | |
1885 | .owner = THIS_MODULE, | |
1886 | .pf = NFPROTO_IPV6, | |
1887 | .hooknum = NF_INET_PRE_ROUTING, | |
1888 | .priority = NF_IP6_PRI_NAT_DST + 1, | |
1889 | }, | |
cb59155f JA |
1890 | /* After packet filtering, change source only for VS/NAT */ |
1891 | { | |
1892 | .hook = ip_vs_reply6, | |
1893 | .owner = THIS_MODULE, | |
4c809d63 | 1894 | .pf = NFPROTO_IPV6, |
cb59155f | 1895 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1896 | .priority = NF_IP6_PRI_NAT_SRC - 2, |
cb59155f | 1897 | }, |
473b23d3 JV |
1898 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1899 | * or VS/NAT(change destination), so that filtering rules can be | |
1900 | * applied to IPVS. */ | |
1901 | { | |
cb59155f | 1902 | .hook = ip_vs_remote_request6, |
473b23d3 | 1903 | .owner = THIS_MODULE, |
4c809d63 | 1904 | .pf = NFPROTO_IPV6, |
cb59155f | 1905 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1906 | .priority = NF_IP6_PRI_NAT_SRC - 1, |
473b23d3 | 1907 | }, |
fc604767 | 1908 | /* Before ip_vs_in, change source only for VS/NAT */ |
473b23d3 | 1909 | { |
fc604767 | 1910 | .hook = ip_vs_local_reply6, |
473b23d3 | 1911 | .owner = THIS_MODULE, |
4c809d63 | 1912 | .pf = NFPROTO_IPV4, |
fc604767 | 1913 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1914 | .priority = NF_IP6_PRI_NAT_DST + 1, |
473b23d3 | 1915 | }, |
cb59155f JA |
1916 | /* After mangle, schedule and forward local requests */ |
1917 | { | |
1918 | .hook = ip_vs_local_request6, | |
1919 | .owner = THIS_MODULE, | |
4c809d63 | 1920 | .pf = NFPROTO_IPV6, |
cb59155f | 1921 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1922 | .priority = NF_IP6_PRI_NAT_DST + 2, |
cb59155f | 1923 | }, |
473b23d3 JV |
1924 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1925 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1926 | { | |
1927 | .hook = ip_vs_forward_icmp_v6, | |
1928 | .owner = THIS_MODULE, | |
4c809d63 | 1929 | .pf = NFPROTO_IPV6, |
cb59155f JA |
1930 | .hooknum = NF_INET_FORWARD, |
1931 | .priority = 99, | |
473b23d3 | 1932 | }, |
fc604767 JA |
1933 | /* After packet filtering, change source only for VS/NAT */ |
1934 | { | |
1935 | .hook = ip_vs_reply6, | |
1936 | .owner = THIS_MODULE, | |
4c809d63 | 1937 | .pf = NFPROTO_IPV6, |
fc604767 JA |
1938 | .hooknum = NF_INET_FORWARD, |
1939 | .priority = 100, | |
1940 | }, | |
473b23d3 | 1941 | #endif |
1da177e4 | 1942 | }; |
61b1ab45 HS |
1943 | /* |
1944 | * Initialize IP Virtual Server netns mem. | |
1945 | */ | |
1946 | static int __net_init __ip_vs_init(struct net *net) | |
1947 | { | |
1948 | struct netns_ipvs *ipvs; | |
1949 | ||
61b1ab45 | 1950 | ipvs = net_generic(net, ip_vs_net_id); |
0a9ee813 | 1951 | if (ipvs == NULL) |
61b1ab45 | 1952 | return -ENOMEM; |
0a9ee813 | 1953 | |
7a4f0761 HS |
1954 | /* Hold the beast until a service is registerd */ |
1955 | ipvs->enable = 0; | |
f6340ee0 | 1956 | ipvs->net = net; |
61b1ab45 HS |
1957 | /* Counters used for creating unique names */ |
1958 | ipvs->gen = atomic_read(&ipvs_netns_cnt); | |
1959 | atomic_inc(&ipvs_netns_cnt); | |
1960 | net->ipvs = ipvs; | |
7a4f0761 | 1961 | |
503cf15a | 1962 | if (ip_vs_estimator_net_init(net) < 0) |
7a4f0761 HS |
1963 | goto estimator_fail; |
1964 | ||
503cf15a | 1965 | if (ip_vs_control_net_init(net) < 0) |
7a4f0761 HS |
1966 | goto control_fail; |
1967 | ||
503cf15a | 1968 | if (ip_vs_protocol_net_init(net) < 0) |
7a4f0761 HS |
1969 | goto protocol_fail; |
1970 | ||
503cf15a | 1971 | if (ip_vs_app_net_init(net) < 0) |
7a4f0761 HS |
1972 | goto app_fail; |
1973 | ||
503cf15a | 1974 | if (ip_vs_conn_net_init(net) < 0) |
7a4f0761 HS |
1975 | goto conn_fail; |
1976 | ||
503cf15a | 1977 | if (ip_vs_sync_net_init(net) < 0) |
7a4f0761 HS |
1978 | goto sync_fail; |
1979 | ||
a870c8c5 | 1980 | printk(KERN_INFO "IPVS: Creating netns size=%zu id=%d\n", |
61b1ab45 HS |
1981 | sizeof(struct netns_ipvs), ipvs->gen); |
1982 | return 0; | |
7a4f0761 HS |
1983 | /* |
1984 | * Error handling | |
1985 | */ | |
1986 | ||
1987 | sync_fail: | |
503cf15a | 1988 | ip_vs_conn_net_cleanup(net); |
7a4f0761 | 1989 | conn_fail: |
503cf15a | 1990 | ip_vs_app_net_cleanup(net); |
7a4f0761 | 1991 | app_fail: |
503cf15a | 1992 | ip_vs_protocol_net_cleanup(net); |
7a4f0761 | 1993 | protocol_fail: |
503cf15a | 1994 | ip_vs_control_net_cleanup(net); |
7a4f0761 | 1995 | control_fail: |
503cf15a | 1996 | ip_vs_estimator_net_cleanup(net); |
7a4f0761 | 1997 | estimator_fail: |
39f618b4 | 1998 | net->ipvs = NULL; |
7a4f0761 | 1999 | return -ENOMEM; |
61b1ab45 HS |
2000 | } |
2001 | ||
2002 | static void __net_exit __ip_vs_cleanup(struct net *net) | |
2003 | { | |
503cf15a HS |
2004 | ip_vs_service_net_cleanup(net); /* ip_vs_flush() with locks */ |
2005 | ip_vs_conn_net_cleanup(net); | |
2006 | ip_vs_app_net_cleanup(net); | |
2007 | ip_vs_protocol_net_cleanup(net); | |
2008 | ip_vs_control_net_cleanup(net); | |
2009 | ip_vs_estimator_net_cleanup(net); | |
1ae132b0 | 2010 | IP_VS_DBG(2, "ipvs netns %d released\n", net_ipvs(net)->gen); |
39f618b4 | 2011 | net->ipvs = NULL; |
61b1ab45 HS |
2012 | } |
2013 | ||
7a4f0761 HS |
2014 | static void __net_exit __ip_vs_dev_cleanup(struct net *net) |
2015 | { | |
2016 | EnterFunction(2); | |
2017 | net_ipvs(net)->enable = 0; /* Disable packet reception */ | |
8f4e0a18 | 2018 | smp_wmb(); |
503cf15a | 2019 | ip_vs_sync_net_cleanup(net); |
7a4f0761 HS |
2020 | LeaveFunction(2); |
2021 | } | |
2022 | ||
61b1ab45 HS |
2023 | static struct pernet_operations ipvs_core_ops = { |
2024 | .init = __ip_vs_init, | |
2025 | .exit = __ip_vs_cleanup, | |
2026 | .id = &ip_vs_net_id, | |
2027 | .size = sizeof(struct netns_ipvs), | |
2028 | }; | |
1da177e4 | 2029 | |
7a4f0761 HS |
2030 | static struct pernet_operations ipvs_core_dev_ops = { |
2031 | .exit = __ip_vs_dev_cleanup, | |
2032 | }; | |
2033 | ||
1da177e4 LT |
2034 | /* |
2035 | * Initialize IP Virtual Server | |
2036 | */ | |
2037 | static int __init ip_vs_init(void) | |
2038 | { | |
2039 | int ret; | |
2040 | ||
2041 | ret = ip_vs_control_init(); | |
2042 | if (ret < 0) { | |
1e3e238e | 2043 | pr_err("can't setup control.\n"); |
6c8f7949 | 2044 | goto exit; |
1da177e4 LT |
2045 | } |
2046 | ||
2047 | ip_vs_protocol_init(); | |
2048 | ||
1da177e4 LT |
2049 | ret = ip_vs_conn_init(); |
2050 | if (ret < 0) { | |
1e3e238e | 2051 | pr_err("can't setup connection table.\n"); |
6c8f7949 | 2052 | goto cleanup_protocol; |
61b1ab45 HS |
2053 | } |
2054 | ||
7a4f0761 HS |
2055 | ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */ |
2056 | if (ret < 0) | |
6c8f7949 | 2057 | goto cleanup_conn; |
7a4f0761 HS |
2058 | |
2059 | ret = register_pernet_device(&ipvs_core_dev_ops); | |
2060 | if (ret < 0) | |
2061 | goto cleanup_sub; | |
2062 | ||
41c5b317 | 2063 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 | 2064 | if (ret < 0) { |
1e3e238e | 2065 | pr_err("can't register hooks.\n"); |
7a4f0761 | 2066 | goto cleanup_dev; |
1da177e4 LT |
2067 | } |
2068 | ||
8537de8a HS |
2069 | ret = ip_vs_register_nl_ioctl(); |
2070 | if (ret < 0) { | |
2071 | pr_err("can't register netlink/ioctl.\n"); | |
2072 | goto cleanup_hooks; | |
2073 | } | |
2074 | ||
1e3e238e | 2075 | pr_info("ipvs loaded.\n"); |
7a4f0761 | 2076 | |
1da177e4 LT |
2077 | return ret; |
2078 | ||
8537de8a HS |
2079 | cleanup_hooks: |
2080 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); | |
7a4f0761 HS |
2081 | cleanup_dev: |
2082 | unregister_pernet_device(&ipvs_core_dev_ops); | |
2083 | cleanup_sub: | |
2084 | unregister_pernet_subsys(&ipvs_core_ops); | |
552ad65a | 2085 | cleanup_conn: |
1da177e4 | 2086 | ip_vs_conn_cleanup(); |
552ad65a | 2087 | cleanup_protocol: |
1da177e4 LT |
2088 | ip_vs_protocol_cleanup(); |
2089 | ip_vs_control_cleanup(); | |
6c8f7949 | 2090 | exit: |
1da177e4 LT |
2091 | return ret; |
2092 | } | |
2093 | ||
2094 | static void __exit ip_vs_cleanup(void) | |
2095 | { | |
8537de8a | 2096 | ip_vs_unregister_nl_ioctl(); |
41c5b317 | 2097 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
7a4f0761 HS |
2098 | unregister_pernet_device(&ipvs_core_dev_ops); |
2099 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ | |
1da177e4 | 2100 | ip_vs_conn_cleanup(); |
1da177e4 LT |
2101 | ip_vs_protocol_cleanup(); |
2102 | ip_vs_control_cleanup(); | |
1e3e238e | 2103 | pr_info("ipvs unloaded.\n"); |
1da177e4 LT |
2104 | } |
2105 | ||
2106 | module_init(ip_vs_init); | |
2107 | module_exit(ip_vs_cleanup); | |
2108 | MODULE_LICENSE("GPL"); |