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 | 99 | default: |
1404c3ab | 100 | sprintf(buf, "IP_%u", proto); |
1da177e4 LT |
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; | |
7c08d78e | 115 | struct netns_ipvs *ipvs = cp->ipvs; |
b17fc996 | 116 | |
1da177e4 | 117 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
b17fc996 | 118 | struct ip_vs_cpu_stats *s; |
bcbde4c0 | 119 | struct ip_vs_service *svc; |
b17fc996 HS |
120 | |
121 | s = this_cpu_ptr(dest->stats.cpustats); | |
b17fc996 | 122 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
123 | s->cnt.inpkts++; |
124 | s->cnt.inbytes += skb->len; | |
b17fc996 HS |
125 | u64_stats_update_end(&s->syncp); |
126 | ||
bcbde4c0 JA |
127 | rcu_read_lock(); |
128 | svc = rcu_dereference(dest->svc); | |
129 | s = this_cpu_ptr(svc->stats.cpustats); | |
b17fc996 | 130 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
131 | s->cnt.inpkts++; |
132 | s->cnt.inbytes += skb->len; | |
b17fc996 | 133 | u64_stats_update_end(&s->syncp); |
bcbde4c0 | 134 | rcu_read_unlock(); |
b17fc996 | 135 | |
2a0751af | 136 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
b17fc996 | 137 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
138 | s->cnt.inpkts++; |
139 | s->cnt.inbytes += skb->len; | |
b17fc996 | 140 | u64_stats_update_end(&s->syncp); |
1da177e4 LT |
141 | } |
142 | } | |
143 | ||
144 | ||
145 | static inline void | |
146 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
147 | { | |
148 | struct ip_vs_dest *dest = cp->dest; | |
7c08d78e | 149 | struct netns_ipvs *ipvs = cp->ipvs; |
b17fc996 | 150 | |
1da177e4 | 151 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
b17fc996 | 152 | struct ip_vs_cpu_stats *s; |
bcbde4c0 | 153 | struct ip_vs_service *svc; |
b17fc996 HS |
154 | |
155 | s = this_cpu_ptr(dest->stats.cpustats); | |
b17fc996 | 156 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
157 | s->cnt.outpkts++; |
158 | s->cnt.outbytes += skb->len; | |
b17fc996 HS |
159 | u64_stats_update_end(&s->syncp); |
160 | ||
bcbde4c0 JA |
161 | rcu_read_lock(); |
162 | svc = rcu_dereference(dest->svc); | |
163 | s = this_cpu_ptr(svc->stats.cpustats); | |
b17fc996 | 164 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
165 | s->cnt.outpkts++; |
166 | s->cnt.outbytes += skb->len; | |
b17fc996 | 167 | u64_stats_update_end(&s->syncp); |
bcbde4c0 | 168 | rcu_read_unlock(); |
b17fc996 | 169 | |
2a0751af | 170 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
b17fc996 | 171 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
172 | s->cnt.outpkts++; |
173 | s->cnt.outbytes += skb->len; | |
b17fc996 | 174 | u64_stats_update_end(&s->syncp); |
1da177e4 LT |
175 | } |
176 | } | |
177 | ||
178 | ||
179 | static inline void | |
180 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) | |
181 | { | |
3109d2f2 | 182 | struct netns_ipvs *ipvs = svc->ipvs; |
b17fc996 | 183 | struct ip_vs_cpu_stats *s; |
1da177e4 | 184 | |
b17fc996 | 185 | s = this_cpu_ptr(cp->dest->stats.cpustats); |
cd67cd5e JA |
186 | u64_stats_update_begin(&s->syncp); |
187 | s->cnt.conns++; | |
188 | u64_stats_update_end(&s->syncp); | |
1da177e4 | 189 | |
b17fc996 | 190 | s = this_cpu_ptr(svc->stats.cpustats); |
cd67cd5e JA |
191 | u64_stats_update_begin(&s->syncp); |
192 | s->cnt.conns++; | |
193 | u64_stats_update_end(&s->syncp); | |
b17fc996 | 194 | |
2a0751af | 195 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
cd67cd5e JA |
196 | u64_stats_update_begin(&s->syncp); |
197 | s->cnt.conns++; | |
198 | u64_stats_update_end(&s->syncp); | |
1da177e4 LT |
199 | } |
200 | ||
201 | ||
4a516f11 | 202 | static inline void |
1da177e4 LT |
203 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, |
204 | const struct sk_buff *skb, | |
9330419d | 205 | struct ip_vs_proto_data *pd) |
1da177e4 | 206 | { |
4a516f11 SH |
207 | if (likely(pd->pp->state_transition)) |
208 | pd->pp->state_transition(cp, direction, skb, pd); | |
1da177e4 LT |
209 | } |
210 | ||
a5959d53 | 211 | static inline int |
85999283 SH |
212 | ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc, |
213 | struct sk_buff *skb, int protocol, | |
214 | const union nf_inet_addr *caddr, __be16 cport, | |
215 | const union nf_inet_addr *vaddr, __be16 vport, | |
216 | struct ip_vs_conn_param *p) | |
217 | { | |
3109d2f2 | 218 | ip_vs_conn_fill_param(svc->ipvs, svc->af, protocol, caddr, cport, vaddr, |
6e67e586 | 219 | vport, p); |
ceec4c38 | 220 | p->pe = rcu_dereference(svc->pe); |
85999283 | 221 | if (p->pe && p->pe->fill_param) |
a5959d53 HS |
222 | return p->pe->fill_param(p, skb); |
223 | ||
224 | return 0; | |
85999283 | 225 | } |
1da177e4 | 226 | |
1da177e4 LT |
227 | /* |
228 | * IPVS persistent scheduling function | |
229 | * It creates a connection entry according to its template if exists, | |
230 | * or selects a server and creates a connection entry plus a template. | |
231 | * Locking: we are svc user (svc->refcnt), so we hold all dests too | |
232 | * Protocols supported: TCP, UDP | |
233 | */ | |
234 | static struct ip_vs_conn * | |
235 | ip_vs_sched_persist(struct ip_vs_service *svc, | |
d4383f04 JDB |
236 | struct sk_buff *skb, __be16 src_port, __be16 dst_port, |
237 | int *ignored, struct ip_vs_iphdr *iph) | |
1da177e4 LT |
238 | { |
239 | struct ip_vs_conn *cp = NULL; | |
1da177e4 LT |
240 | struct ip_vs_dest *dest; |
241 | struct ip_vs_conn *ct; | |
5b57a98c | 242 | __be16 dport = 0; /* destination port to forward */ |
3575792e | 243 | unsigned int flags; |
f11017ec | 244 | struct ip_vs_conn_param param; |
e0aac52e | 245 | const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) }; |
28364a59 JV |
246 | union nf_inet_addr snet; /* source network of the client, |
247 | after masking */ | |
ee78378f AG |
248 | const union nf_inet_addr *src_addr, *dst_addr; |
249 | ||
250 | if (likely(!ip_vs_iph_inverse(iph))) { | |
251 | src_addr = &iph->saddr; | |
252 | dst_addr = &iph->daddr; | |
253 | } else { | |
254 | src_addr = &iph->daddr; | |
255 | dst_addr = &iph->saddr; | |
256 | } | |
257 | ||
cd17f9ed | 258 | |
1da177e4 | 259 | /* Mask saddr with the netmask to adjust template granularity */ |
cd17f9ed JV |
260 | #ifdef CONFIG_IP_VS_IPV6 |
261 | if (svc->af == AF_INET6) | |
ee78378f | 262 | ipv6_addr_prefix(&snet.in6, &src_addr->in6, |
0a925864 | 263 | (__force __u32) svc->netmask); |
cd17f9ed JV |
264 | else |
265 | #endif | |
ee78378f | 266 | snet.ip = src_addr->ip & svc->netmask; |
1da177e4 | 267 | |
cd17f9ed JV |
268 | IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " |
269 | "mnet %s\n", | |
ee78378f AG |
270 | IP_VS_DBG_ADDR(svc->af, src_addr), ntohs(src_port), |
271 | IP_VS_DBG_ADDR(svc->af, dst_addr), ntohs(dst_port), | |
cd17f9ed | 272 | IP_VS_DBG_ADDR(svc->af, &snet)); |
1da177e4 LT |
273 | |
274 | /* | |
275 | * As far as we know, FTP is a very complicated network protocol, and | |
276 | * it uses control connection and data connections. For active FTP, | |
277 | * FTP server initialize data connection to the client, its source port | |
278 | * is often 20. For passive FTP, FTP server tells the clients the port | |
279 | * that it passively listens to, and the client issues the data | |
280 | * connection. In the tunneling or direct routing mode, the load | |
281 | * balancer is on the client-to-server half of connection, the port | |
282 | * number is unknown to the load balancer. So, a conn template like | |
283 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP | |
284 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> | |
285 | * is created for other persistent services. | |
286 | */ | |
5b57a98c | 287 | { |
d4383f04 | 288 | int protocol = iph->protocol; |
ee78378f | 289 | const union nf_inet_addr *vaddr = dst_addr; |
f11017ec SH |
290 | __be16 vport = 0; |
291 | ||
ce144f24 | 292 | if (dst_port == svc->port) { |
5b57a98c SH |
293 | /* non-FTP template: |
294 | * <protocol, caddr, 0, vaddr, vport, daddr, dport> | |
295 | * FTP template: | |
296 | * <protocol, caddr, 0, vaddr, 0, daddr, 0> | |
1da177e4 LT |
297 | */ |
298 | if (svc->port != FTPPORT) | |
ce144f24 | 299 | vport = dst_port; |
1da177e4 | 300 | } else { |
5b57a98c SH |
301 | /* Note: persistent fwmark-based services and |
302 | * persistent port zero service are handled here. | |
303 | * fwmark template: | |
304 | * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> | |
305 | * port zero template: | |
306 | * <protocol,caddr,0,vaddr,0,daddr,0> | |
1da177e4 | 307 | */ |
28364a59 | 308 | if (svc->fwmark) { |
5b57a98c SH |
309 | protocol = IPPROTO_IP; |
310 | vaddr = &fwmark; | |
311 | } | |
1da177e4 | 312 | } |
a5959d53 HS |
313 | /* return *ignored = -1 so NF_DROP can be used */ |
314 | if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0, | |
315 | vaddr, vport, ¶m) < 0) { | |
316 | *ignored = -1; | |
317 | return NULL; | |
318 | } | |
1da177e4 LT |
319 | } |
320 | ||
5b57a98c | 321 | /* Check if a template already exists */ |
f11017ec | 322 | ct = ip_vs_ct_in_get(¶m); |
5b57a98c | 323 | if (!ct || !ip_vs_check_template(ct)) { |
ceec4c38 JA |
324 | struct ip_vs_scheduler *sched; |
325 | ||
a5959d53 HS |
326 | /* |
327 | * No template found or the dest of the connection | |
5b57a98c | 328 | * template is not available. |
a5959d53 | 329 | * return *ignored=0 i.e. ICMP and NF_DROP |
5b57a98c | 330 | */ |
ceec4c38 | 331 | sched = rcu_dereference(svc->scheduler); |
05f00505 JA |
332 | if (sched) { |
333 | /* read svc->sched_data after svc->scheduler */ | |
334 | smp_rmb(); | |
335 | dest = sched->schedule(svc, skb, iph); | |
336 | } else { | |
337 | dest = NULL; | |
338 | } | |
5b57a98c SH |
339 | if (!dest) { |
340 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
85999283 | 341 | kfree(param.pe_data); |
a5959d53 | 342 | *ignored = 0; |
5b57a98c SH |
343 | return NULL; |
344 | } | |
345 | ||
ce144f24 | 346 | if (dst_port == svc->port && svc->port != FTPPORT) |
5b57a98c SH |
347 | dport = dest->port; |
348 | ||
85999283 SH |
349 | /* Create a template |
350 | * This adds param.pe_data to the template, | |
351 | * and thus param.pe_data will be destroyed | |
352 | * when the template expires */ | |
ba38528a | 353 | ct = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport, |
0e051e68 | 354 | IP_VS_CONN_F_TEMPLATE, dest, skb->mark); |
85999283 SH |
355 | if (ct == NULL) { |
356 | kfree(param.pe_data); | |
a5959d53 | 357 | *ignored = -1; |
5b57a98c | 358 | return NULL; |
85999283 | 359 | } |
5b57a98c SH |
360 | |
361 | ct->timeout = svc->timeout; | |
85999283 | 362 | } else { |
5b57a98c SH |
363 | /* set destination with the found template */ |
364 | dest = ct->dest; | |
85999283 SH |
365 | kfree(param.pe_data); |
366 | } | |
5b57a98c | 367 | |
ce144f24 | 368 | dport = dst_port; |
5b57a98c SH |
369 | if (dport == svc->port && dest->port) |
370 | dport = dest->port; | |
371 | ||
26ec037f | 372 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
d4383f04 | 373 | && iph->protocol == IPPROTO_UDP) ? |
26ec037f NC |
374 | IP_VS_CONN_F_ONE_PACKET : 0; |
375 | ||
1da177e4 LT |
376 | /* |
377 | * Create a new connection according to the template | |
378 | */ | |
3109d2f2 | 379 | ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol, src_addr, |
ee78378f | 380 | src_port, dst_addr, dst_port, ¶m); |
ce144f24 | 381 | |
ba38528a AG |
382 | cp = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport, flags, dest, |
383 | skb->mark); | |
1da177e4 LT |
384 | if (cp == NULL) { |
385 | ip_vs_conn_put(ct); | |
a5959d53 | 386 | *ignored = -1; |
1da177e4 LT |
387 | return NULL; |
388 | } | |
389 | ||
390 | /* | |
391 | * Add its control | |
392 | */ | |
393 | ip_vs_control_add(cp, ct); | |
394 | ip_vs_conn_put(ct); | |
395 | ||
396 | ip_vs_conn_stats(cp, svc); | |
397 | return cp; | |
398 | } | |
399 | ||
400 | ||
401 | /* | |
402 | * IPVS main scheduling function | |
403 | * It selects a server according to the virtual service, and | |
404 | * creates a connection entry. | |
405 | * Protocols supported: TCP, UDP | |
a5959d53 HS |
406 | * |
407 | * Usage of *ignored | |
408 | * | |
409 | * 1 : protocol tried to schedule (eg. on SYN), found svc but the | |
410 | * svc/scheduler decides that this packet should be accepted with | |
411 | * NF_ACCEPT because it must not be scheduled. | |
412 | * | |
413 | * 0 : scheduler can not find destination, so try bypass or | |
414 | * return ICMP and then NF_DROP (ip_vs_leave). | |
415 | * | |
416 | * -1 : scheduler tried to schedule but fatal error occurred, eg. | |
417 | * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param | |
418 | * failure such as missing Call-ID, ENOMEM on skb_linearize | |
419 | * or pe_data. In this case we should return NF_DROP without | |
420 | * any attempts to send ICMP with ip_vs_leave. | |
1da177e4 LT |
421 | */ |
422 | struct ip_vs_conn * | |
190ecd27 | 423 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
d4383f04 JDB |
424 | struct ip_vs_proto_data *pd, int *ignored, |
425 | struct ip_vs_iphdr *iph) | |
1da177e4 | 426 | { |
9330419d | 427 | struct ip_vs_protocol *pp = pd->pp; |
1da177e4 | 428 | struct ip_vs_conn *cp = NULL; |
ceec4c38 | 429 | struct ip_vs_scheduler *sched; |
1da177e4 | 430 | struct ip_vs_dest *dest; |
ee78378f AG |
431 | __be16 _ports[2], *pptr, cport, vport; |
432 | const void *caddr, *vaddr; | |
3575792e | 433 | unsigned int flags; |
1da177e4 | 434 | |
190ecd27 | 435 | *ignored = 1; |
2f74713d JDB |
436 | /* |
437 | * IPv6 frags, only the first hit here. | |
438 | */ | |
d4383f04 | 439 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
1da177e4 LT |
440 | if (pptr == NULL) |
441 | return NULL; | |
442 | ||
ee78378f AG |
443 | if (likely(!ip_vs_iph_inverse(iph))) { |
444 | cport = pptr[0]; | |
445 | caddr = &iph->saddr; | |
446 | vport = pptr[1]; | |
447 | vaddr = &iph->daddr; | |
448 | } else { | |
449 | cport = pptr[1]; | |
450 | caddr = &iph->daddr; | |
451 | vport = pptr[0]; | |
452 | vaddr = &iph->saddr; | |
453 | } | |
454 | ||
190ecd27 JA |
455 | /* |
456 | * FTPDATA needs this check when using local real server. | |
457 | * Never schedule Active FTPDATA connections from real server. | |
458 | * For LVS-NAT they must be already created. For other methods | |
459 | * with persistence the connection is created on SYN+ACK. | |
460 | */ | |
ee78378f | 461 | if (cport == FTPDATA) { |
b0e010c5 | 462 | IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off, |
0d79641a | 463 | "Not scheduling FTPDATA"); |
190ecd27 JA |
464 | return NULL; |
465 | } | |
466 | ||
467 | /* | |
a5959d53 | 468 | * Do not schedule replies from local real server. |
190ecd27 | 469 | */ |
802c41ad AG |
470 | if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK)) { |
471 | iph->hdr_flags ^= IP_VS_HDR_INVERSE; | |
ab161976 | 472 | cp = pp->conn_in_get(svc->ipvs, svc->af, skb, iph); |
802c41ad AG |
473 | iph->hdr_flags ^= IP_VS_HDR_INVERSE; |
474 | ||
475 | if (cp) { | |
476 | IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off, | |
477 | "Not scheduling reply for existing" | |
478 | " connection"); | |
479 | __ip_vs_conn_put(cp); | |
480 | return NULL; | |
481 | } | |
190ecd27 JA |
482 | } |
483 | ||
1da177e4 LT |
484 | /* |
485 | * Persistent service | |
486 | */ | |
a5959d53 | 487 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) |
ee78378f | 488 | return ip_vs_sched_persist(svc, skb, cport, vport, ignored, |
d4383f04 | 489 | iph); |
a5959d53 HS |
490 | |
491 | *ignored = 0; | |
1da177e4 LT |
492 | |
493 | /* | |
494 | * Non-persistent service | |
495 | */ | |
ee78378f | 496 | if (!svc->fwmark && vport != svc->port) { |
1da177e4 | 497 | if (!svc->port) |
1e3e238e HE |
498 | pr_err("Schedule: port zero only supported " |
499 | "in persistent services, " | |
500 | "check your ipvs configuration\n"); | |
1da177e4 LT |
501 | return NULL; |
502 | } | |
503 | ||
ceec4c38 | 504 | sched = rcu_dereference(svc->scheduler); |
05f00505 JA |
505 | if (sched) { |
506 | /* read svc->sched_data after svc->scheduler */ | |
507 | smp_rmb(); | |
508 | dest = sched->schedule(svc, skb, iph); | |
509 | } else { | |
510 | dest = NULL; | |
511 | } | |
1da177e4 LT |
512 | if (dest == NULL) { |
513 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
514 | return NULL; | |
515 | } | |
516 | ||
26ec037f | 517 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
d4383f04 | 518 | && iph->protocol == IPPROTO_UDP) ? |
26ec037f NC |
519 | IP_VS_CONN_F_ONE_PACKET : 0; |
520 | ||
1da177e4 LT |
521 | /* |
522 | * Create a connection entry. | |
523 | */ | |
f11017ec SH |
524 | { |
525 | struct ip_vs_conn_param p; | |
6e67e586 | 526 | |
3109d2f2 | 527 | ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol, |
ee78378f | 528 | caddr, cport, vaddr, vport, &p); |
ba38528a | 529 | cp = ip_vs_conn_new(&p, dest->af, &dest->addr, |
ee78378f | 530 | dest->port ? dest->port : vport, |
0e051e68 | 531 | flags, dest, skb->mark); |
a5959d53 HS |
532 | if (!cp) { |
533 | *ignored = -1; | |
f11017ec | 534 | return NULL; |
a5959d53 | 535 | } |
f11017ec | 536 | } |
1da177e4 | 537 | |
cd17f9ed JV |
538 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
539 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", | |
540 | ip_vs_fwd_tag(cp), | |
f18ae720 JA |
541 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), |
542 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
543 | IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport), | |
cd17f9ed | 544 | cp->flags, atomic_read(&cp->refcnt)); |
1da177e4 LT |
545 | |
546 | ip_vs_conn_stats(cp, svc); | |
547 | return cp; | |
548 | } | |
549 | ||
0b729021 AG |
550 | #ifdef CONFIG_SYSCTL |
551 | static inline int ip_vs_addr_is_unicast(struct net *net, int af, | |
552 | union nf_inet_addr *addr) | |
553 | { | |
554 | #ifdef CONFIG_IP_VS_IPV6 | |
555 | if (af == AF_INET6) | |
556 | return ipv6_addr_type(&addr->in6) & IPV6_ADDR_UNICAST; | |
557 | #endif | |
558 | return (inet_addr_type(net, addr->ip) == RTN_UNICAST); | |
559 | } | |
560 | #endif | |
1da177e4 LT |
561 | |
562 | /* | |
563 | * Pass or drop the packet. | |
564 | * Called by ip_vs_in, when the virtual service is available but | |
565 | * no destination is available for a new connection. | |
566 | */ | |
567 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
d4383f04 | 568 | struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph) |
1da177e4 | 569 | { |
0b729021 | 570 | __be16 _ports[2], *pptr, dport; |
51efbcbb EB |
571 | struct netns_ipvs *ipvs = svc->ipvs; |
572 | struct net *net = ipvs->net; | |
9330419d | 573 | |
d4383f04 | 574 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
0b729021 | 575 | if (!pptr) |
1da177e4 | 576 | return NF_DROP; |
0b729021 | 577 | dport = likely(!ip_vs_iph_inverse(iph)) ? pptr[1] : pptr[0]; |
a7a86b86 | 578 | |
1da177e4 | 579 | /* if it is fwmark-based service, the cache_bypass sysctl is up |
2a3b791e | 580 | and the destination is a non-local unicast, then create |
1da177e4 | 581 | a cache_bypass connection entry */ |
57032948 | 582 | if (sysctl_cache_bypass(ipvs) && svc->fwmark && |
0b729021 AG |
583 | !(iph->hdr_flags & (IP_VS_HDR_INVERSE | IP_VS_HDR_ICMP)) && |
584 | ip_vs_addr_is_unicast(net, svc->af, &iph->daddr)) { | |
ad542ced | 585 | int ret; |
1da177e4 | 586 | struct ip_vs_conn *cp; |
3575792e | 587 | unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && |
d4383f04 | 588 | iph->protocol == IPPROTO_UDP) ? |
3575792e | 589 | IP_VS_CONN_F_ONE_PACKET : 0; |
dff630dd | 590 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
1da177e4 | 591 | |
1da177e4 | 592 | /* create a new connection entry */ |
1e3e238e | 593 | IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); |
f11017ec SH |
594 | { |
595 | struct ip_vs_conn_param p; | |
3109d2f2 | 596 | ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol, |
d4383f04 JDB |
597 | &iph->saddr, pptr[0], |
598 | &iph->daddr, pptr[1], &p); | |
ba38528a | 599 | cp = ip_vs_conn_new(&p, svc->af, &daddr, 0, |
f11017ec | 600 | IP_VS_CONN_F_BYPASS | flags, |
0e051e68 | 601 | NULL, skb->mark); |
f11017ec SH |
602 | if (!cp) |
603 | return NF_DROP; | |
604 | } | |
1da177e4 LT |
605 | |
606 | /* statistics */ | |
607 | ip_vs_in_stats(cp, skb); | |
608 | ||
609 | /* set state */ | |
4a516f11 | 610 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 LT |
611 | |
612 | /* transmit the first SYN packet */ | |
d4383f04 | 613 | ret = cp->packet_xmit(skb, cp, pd->pp, iph); |
1da177e4 LT |
614 | /* do not touch skb anymore */ |
615 | ||
616 | atomic_inc(&cp->in_pkts); | |
617 | ip_vs_conn_put(cp); | |
618 | return ret; | |
619 | } | |
620 | ||
621 | /* | |
622 | * When the virtual ftp service is presented, packets destined | |
623 | * for other services on the VIP may get here (except services | |
624 | * listed in the ipvs table), pass the packets, because it is | |
625 | * not ipvs job to decide to drop the packets. | |
626 | */ | |
0b729021 | 627 | if (svc->port == FTPPORT && dport != FTPPORT) |
1da177e4 | 628 | return NF_ACCEPT; |
0b729021 AG |
629 | |
630 | if (unlikely(ip_vs_iph_icmp(iph))) | |
631 | return NF_DROP; | |
1da177e4 LT |
632 | |
633 | /* | |
634 | * Notify the client that the destination is unreachable, and | |
635 | * release the socket buffer. | |
636 | * Since it is in IP layer, the TCP socket is not actually | |
637 | * created, the TCP RST packet cannot be sent, instead that | |
638 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
639 | */ | |
2a3b791e | 640 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f | 641 | if (svc->af == AF_INET6) { |
57032948 EB |
642 | if (!skb->dev) |
643 | skb->dev = net->loopback_dev; | |
3ffe533c | 644 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
cb59155f | 645 | } else |
2a3b791e JV |
646 | #endif |
647 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
648 | ||
1da177e4 LT |
649 | return NF_DROP; |
650 | } | |
651 | ||
84b3cee3 SH |
652 | #ifdef CONFIG_SYSCTL |
653 | ||
a43d1a6b | 654 | static int sysctl_snat_reroute(struct netns_ipvs *ipvs) |
84b3cee3 | 655 | { |
84b3cee3 SH |
656 | return ipvs->sysctl_snat_reroute; |
657 | } | |
658 | ||
2300f045 | 659 | static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs) |
0cfa558e | 660 | { |
0cfa558e SH |
661 | return ipvs->sysctl_nat_icmp_send; |
662 | } | |
663 | ||
71a8ab6c SH |
664 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) |
665 | { | |
666 | return ipvs->sysctl_expire_nodest_conn; | |
667 | } | |
668 | ||
84b3cee3 SH |
669 | #else |
670 | ||
a43d1a6b | 671 | static int sysctl_snat_reroute(struct netns_ipvs *ipvs) { return 0; } |
2300f045 | 672 | static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs) { return 0; } |
71a8ab6c | 673 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; } |
84b3cee3 SH |
674 | |
675 | #endif | |
676 | ||
b1550f22 | 677 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
1da177e4 | 678 | { |
d3bc23e7 | 679 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
1da177e4 LT |
680 | } |
681 | ||
1ca5bb54 JA |
682 | static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum) |
683 | { | |
684 | if (NF_INET_LOCAL_IN == hooknum) | |
685 | return IP_DEFRAG_VS_IN; | |
686 | if (NF_INET_FORWARD == hooknum) | |
687 | return IP_DEFRAG_VS_FWD; | |
688 | return IP_DEFRAG_VS_OUT; | |
689 | } | |
690 | ||
57781c1c EB |
691 | static inline int ip_vs_gather_frags(struct netns_ipvs *ipvs, |
692 | struct sk_buff *skb, u_int32_t user) | |
1da177e4 | 693 | { |
ac69269a | 694 | int err; |
776c729e | 695 | |
ac69269a | 696 | local_bh_disable(); |
19bcf9f2 | 697 | err = ip_defrag(ipvs->net, skb, user); |
ac69269a | 698 | local_bh_enable(); |
776c729e | 699 | if (!err) |
eddc9ec5 | 700 | ip_send_check(ip_hdr(skb)); |
776c729e HX |
701 | |
702 | return err; | |
1da177e4 LT |
703 | } |
704 | ||
a43d1a6b EB |
705 | static int ip_vs_route_me_harder(struct netns_ipvs *ipvs, int af, |
706 | struct sk_buff *skb, unsigned int hooknum) | |
ba4fd7e9 | 707 | { |
a43d1a6b | 708 | if (!sysctl_snat_reroute(ipvs)) |
579eb62a JA |
709 | return 0; |
710 | /* Reroute replies only to remote clients (FORWARD and LOCAL_OUT) */ | |
711 | if (NF_INET_LOCAL_IN == hooknum) | |
712 | return 0; | |
ba4fd7e9 SH |
713 | #ifdef CONFIG_IP_VS_IPV6 |
714 | if (af == AF_INET6) { | |
579eb62a JA |
715 | struct dst_entry *dst = skb_dst(skb); |
716 | ||
717 | if (dst->dev && !(dst->dev->flags & IFF_LOOPBACK) && | |
5f5d74d7 | 718 | ip6_route_me_harder(ipvs->net, skb) != 0) |
ba4fd7e9 SH |
719 | return 1; |
720 | } else | |
721 | #endif | |
579eb62a | 722 | if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL) && |
e45f5066 | 723 | ip_route_me_harder(ipvs->net, skb, RTN_LOCAL) != 0) |
ba4fd7e9 SH |
724 | return 1; |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
1da177e4 LT |
729 | /* |
730 | * Packet has been made sufficiently writable in caller | |
731 | * - inout: 1=in->out, 0=out->in | |
732 | */ | |
733 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
734 | struct ip_vs_conn *cp, int inout) | |
735 | { | |
eddc9ec5 | 736 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 737 | unsigned int icmp_offset = iph->ihl*4; |
d56f90a7 ACM |
738 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
739 | icmp_offset); | |
1da177e4 LT |
740 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
741 | ||
742 | if (inout) { | |
e7ade46a | 743 | iph->saddr = cp->vaddr.ip; |
1da177e4 | 744 | ip_send_check(iph); |
e7ade46a | 745 | ciph->daddr = cp->vaddr.ip; |
1da177e4 LT |
746 | ip_send_check(ciph); |
747 | } else { | |
e7ade46a | 748 | iph->daddr = cp->daddr.ip; |
1da177e4 | 749 | ip_send_check(iph); |
e7ade46a | 750 | ciph->saddr = cp->daddr.ip; |
1da177e4 LT |
751 | ip_send_check(ciph); |
752 | } | |
753 | ||
2906f66a VMR |
754 | /* the TCP/UDP/SCTP port */ |
755 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || | |
756 | IPPROTO_SCTP == ciph->protocol) { | |
014d730d | 757 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
1da177e4 LT |
758 | |
759 | if (inout) | |
760 | ports[1] = cp->vport; | |
761 | else | |
762 | ports[0] = cp->dport; | |
763 | } | |
764 | ||
765 | /* And finally the ICMP checksum */ | |
766 | icmph->checksum = 0; | |
767 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
768 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
769 | ||
770 | if (inout) | |
0d79641a | 771 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
772 | "Forwarding altered outgoing ICMP"); |
773 | else | |
0d79641a | 774 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
775 | "Forwarding altered incoming ICMP"); |
776 | } | |
777 | ||
b3cdd2a7 JV |
778 | #ifdef CONFIG_IP_VS_IPV6 |
779 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
780 | struct ip_vs_conn *cp, int inout) | |
781 | { | |
782 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
63dca2c0 JDB |
783 | unsigned int icmp_offset = 0; |
784 | unsigned int offs = 0; /* header offset*/ | |
785 | int protocol; | |
786 | struct icmp6hdr *icmph; | |
787 | struct ipv6hdr *ciph; | |
788 | unsigned short fragoffs; | |
789 | ||
790 | ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL); | |
791 | icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset); | |
792 | offs = icmp_offset + sizeof(struct icmp6hdr); | |
793 | ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs); | |
794 | ||
795 | protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL); | |
b3cdd2a7 JV |
796 | |
797 | if (inout) { | |
798 | iph->saddr = cp->vaddr.in6; | |
799 | ciph->daddr = cp->vaddr.in6; | |
800 | } else { | |
801 | iph->daddr = cp->daddr.in6; | |
802 | ciph->saddr = cp->daddr.in6; | |
803 | } | |
804 | ||
2906f66a | 805 | /* the TCP/UDP/SCTP port */ |
63dca2c0 JDB |
806 | if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
807 | IPPROTO_SCTP == protocol)) { | |
808 | __be16 *ports = (void *)(skb_network_header(skb) + offs); | |
b3cdd2a7 | 809 | |
63dca2c0 JDB |
810 | IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__, |
811 | ntohs(inout ? ports[1] : ports[0]), | |
812 | ntohs(inout ? cp->vport : cp->dport)); | |
b3cdd2a7 JV |
813 | if (inout) |
814 | ports[1] = cp->vport; | |
815 | else | |
816 | ports[0] = cp->dport; | |
817 | } | |
818 | ||
819 | /* And finally the ICMP checksum */ | |
8870f842 SH |
820 | icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, |
821 | skb->len - icmp_offset, | |
822 | IPPROTO_ICMPV6, 0); | |
823 | skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset; | |
824 | skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); | |
825 | skb->ip_summed = CHECKSUM_PARTIAL; | |
b3cdd2a7 JV |
826 | |
827 | if (inout) | |
0d79641a JA |
828 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
829 | (void *)ciph - (void *)iph, | |
830 | "Forwarding altered outgoing ICMPv6"); | |
b3cdd2a7 | 831 | else |
0d79641a JA |
832 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
833 | (void *)ciph - (void *)iph, | |
834 | "Forwarding altered incoming ICMPv6"); | |
b3cdd2a7 JV |
835 | } |
836 | #endif | |
837 | ||
4856c84c | 838 | /* Handle relevant response ICMP messages - forward to the right |
6cb90db5 | 839 | * destination host. |
4856c84c | 840 | */ |
f2428ed5 SH |
841 | static int handle_response_icmp(int af, struct sk_buff *skb, |
842 | union nf_inet_addr *snet, | |
843 | __u8 protocol, struct ip_vs_conn *cp, | |
4856c84c | 844 | struct ip_vs_protocol *pp, |
579eb62a JA |
845 | unsigned int offset, unsigned int ihl, |
846 | unsigned int hooknum) | |
4856c84c MT |
847 | { |
848 | unsigned int verdict = NF_DROP; | |
849 | ||
850 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
1e3e238e HE |
851 | pr_err("shouldn't reach here, because the box is on the " |
852 | "half connection in the tun/dr module.\n"); | |
4856c84c MT |
853 | } |
854 | ||
855 | /* Ensure the checksum is correct */ | |
856 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
857 | /* Failed checksum! */ | |
f2428ed5 SH |
858 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
859 | IP_VS_DBG_ADDR(af, snet)); | |
4856c84c MT |
860 | goto out; |
861 | } | |
862 | ||
2906f66a VMR |
863 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
864 | IPPROTO_SCTP == protocol) | |
4856c84c MT |
865 | offset += 2 * sizeof(__u16); |
866 | if (!skb_make_writable(skb, offset)) | |
867 | goto out; | |
868 | ||
f2428ed5 SH |
869 | #ifdef CONFIG_IP_VS_IPV6 |
870 | if (af == AF_INET6) | |
871 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); | |
872 | else | |
873 | #endif | |
874 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
4856c84c | 875 | |
a43d1a6b | 876 | if (ip_vs_route_me_harder(cp->ipvs, af, skb, hooknum)) |
ba4fd7e9 | 877 | goto out; |
f5a41847 | 878 | |
4856c84c MT |
879 | /* do the statistics and put it back */ |
880 | ip_vs_out_stats(cp, skb); | |
881 | ||
cf356d69 | 882 | skb->ipvs_property = 1; |
f4bc17cd | 883 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 884 | ip_vs_notrack(skb); |
f4bc17cd JA |
885 | else |
886 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
887 | verdict = NF_ACCEPT; |
888 | ||
889 | out: | |
890 | __ip_vs_conn_put(cp); | |
891 | ||
892 | return verdict; | |
893 | } | |
894 | ||
1da177e4 LT |
895 | /* |
896 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
4856c84c | 897 | * Find any that might be relevant, check against existing connections. |
1da177e4 | 898 | * Currently handles error types - unreachable, quench, ttl exceeded. |
1da177e4 | 899 | */ |
7b5f689a EB |
900 | static int ip_vs_out_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, |
901 | int *related, unsigned int hooknum) | |
1da177e4 | 902 | { |
1da177e4 LT |
903 | struct iphdr *iph; |
904 | struct icmphdr _icmph, *ic; | |
905 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 906 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
907 | struct ip_vs_conn *cp; |
908 | struct ip_vs_protocol *pp; | |
4856c84c | 909 | unsigned int offset, ihl; |
f2428ed5 | 910 | union nf_inet_addr snet; |
1da177e4 LT |
911 | |
912 | *related = 1; | |
913 | ||
914 | /* reassemble IP fragments */ | |
56f8a75c | 915 | if (ip_is_fragment(ip_hdr(skb))) { |
57781c1c | 916 | if (ip_vs_gather_frags(ipvs, skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 917 | return NF_STOLEN; |
1da177e4 LT |
918 | } |
919 | ||
eddc9ec5 | 920 | iph = ip_hdr(skb); |
1da177e4 LT |
921 | offset = ihl = iph->ihl * 4; |
922 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
923 | if (ic == NULL) | |
924 | return NF_DROP; | |
925 | ||
14d5e834 | 926 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 927 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 928 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
929 | |
930 | /* | |
931 | * Work through seeing if this is for us. | |
932 | * These checks are supposed to be in an order that means easy | |
933 | * things are checked first to speed up processing.... however | |
934 | * this means that some packets will manage to get a long way | |
935 | * down this stack and then be rejected, but that's life. | |
936 | */ | |
937 | if ((ic->type != ICMP_DEST_UNREACH) && | |
938 | (ic->type != ICMP_SOURCE_QUENCH) && | |
939 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
940 | *related = 0; | |
941 | return NF_ACCEPT; | |
942 | } | |
943 | ||
944 | /* Now find the contained IP header */ | |
945 | offset += sizeof(_icmph); | |
946 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
947 | if (cih == NULL) | |
948 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
949 | ||
950 | pp = ip_vs_proto_get(cih->protocol); | |
951 | if (!pp) | |
952 | return NF_ACCEPT; | |
953 | ||
954 | /* Is the embedded protocol header present? */ | |
4412ec49 | 955 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
956 | pp->dont_defrag)) |
957 | return NF_ACCEPT; | |
958 | ||
0d79641a JA |
959 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
960 | "Checking outgoing ICMP for"); | |
1da177e4 | 961 | |
4fd9beef | 962 | ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, true, &ciph); |
b0e010c5 | 963 | |
1da177e4 | 964 | /* The embedded headers contain source and dest in reverse order */ |
0cf705c8 | 965 | cp = pp->conn_out_get(ipvs, AF_INET, skb, &ciph); |
1da177e4 LT |
966 | if (!cp) |
967 | return NF_ACCEPT; | |
968 | ||
f2428ed5 SH |
969 | snet.ip = iph->saddr; |
970 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, | |
579eb62a | 971 | pp, ciph.len, ihl, hooknum); |
1da177e4 LT |
972 | } |
973 | ||
2a3b791e | 974 | #ifdef CONFIG_IP_VS_IPV6 |
7b5f689a EB |
975 | static int ip_vs_out_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb, |
976 | int *related, unsigned int hooknum, | |
977 | struct ip_vs_iphdr *ipvsh) | |
2a3b791e | 978 | { |
2a3b791e | 979 | struct icmp6hdr _icmph, *ic; |
63dca2c0 | 980 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
2a3b791e JV |
981 | struct ip_vs_conn *cp; |
982 | struct ip_vs_protocol *pp; | |
f2428ed5 | 983 | union nf_inet_addr snet; |
b0e010c5 | 984 | unsigned int offset; |
2a3b791e | 985 | |
63dca2c0 | 986 | *related = 1; |
2f74713d | 987 | ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh); |
2a3b791e JV |
988 | if (ic == NULL) |
989 | return NF_DROP; | |
990 | ||
2a3b791e JV |
991 | /* |
992 | * Work through seeing if this is for us. | |
993 | * These checks are supposed to be in an order that means easy | |
994 | * things are checked first to speed up processing.... however | |
995 | * this means that some packets will manage to get a long way | |
996 | * down this stack and then be rejected, but that's life. | |
997 | */ | |
2fab8917 | 998 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
2a3b791e JV |
999 | *related = 0; |
1000 | return NF_ACCEPT; | |
1001 | } | |
2f74713d JDB |
1002 | /* Fragment header that is before ICMP header tells us that: |
1003 | * it's not an error message since they can't be fragmented. | |
1004 | */ | |
e7165030 | 1005 | if (ipvsh->flags & IP6_FH_F_FRAG) |
2f74713d | 1006 | return NF_DROP; |
2a3b791e | 1007 | |
63dca2c0 JDB |
1008 | IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
1009 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
1010 | &ipvsh->saddr, &ipvsh->daddr); | |
1011 | ||
4fd9beef AG |
1012 | if (!ip_vs_fill_iph_skb_icmp(AF_INET6, skb, ipvsh->len + sizeof(_icmph), |
1013 | true, &ciph)) | |
2a3b791e | 1014 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
63dca2c0 JDB |
1015 | |
1016 | pp = ip_vs_proto_get(ciph.protocol); | |
2a3b791e JV |
1017 | if (!pp) |
1018 | return NF_ACCEPT; | |
1019 | ||
2a3b791e | 1020 | /* The embedded headers contain source and dest in reverse order */ |
0cf705c8 | 1021 | cp = pp->conn_out_get(ipvs, AF_INET6, skb, &ciph); |
2a3b791e JV |
1022 | if (!cp) |
1023 | return NF_ACCEPT; | |
1024 | ||
63dca2c0 | 1025 | snet.in6 = ciph.saddr.in6; |
b0e010c5 | 1026 | offset = ciph.len; |
63dca2c0 | 1027 | return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp, |
b0e010c5 | 1028 | pp, offset, sizeof(struct ipv6hdr), |
579eb62a | 1029 | hooknum); |
2a3b791e JV |
1030 | } |
1031 | #endif | |
1032 | ||
2906f66a VMR |
1033 | /* |
1034 | * Check if sctp chunc is ABORT chunk | |
1035 | */ | |
1036 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) | |
1037 | { | |
1038 | sctp_chunkhdr_t *sch, schunk; | |
1039 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), | |
1040 | sizeof(schunk), &schunk); | |
1041 | if (sch == NULL) | |
1042 | return 0; | |
1043 | if (sch->type == SCTP_CID_ABORT) | |
1044 | return 1; | |
1045 | return 0; | |
1046 | } | |
1047 | ||
2a3b791e | 1048 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
1da177e4 LT |
1049 | { |
1050 | struct tcphdr _tcph, *th; | |
1051 | ||
2a3b791e | 1052 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
1da177e4 LT |
1053 | if (th == NULL) |
1054 | return 0; | |
1055 | return th->rst; | |
1056 | } | |
1057 | ||
dc7b3eb9 GL |
1058 | static inline bool is_new_conn(const struct sk_buff *skb, |
1059 | struct ip_vs_iphdr *iph) | |
1060 | { | |
1061 | switch (iph->protocol) { | |
1062 | case IPPROTO_TCP: { | |
1063 | struct tcphdr _tcph, *th; | |
1064 | ||
1065 | th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph); | |
1066 | if (th == NULL) | |
1067 | return false; | |
1068 | return th->syn; | |
1069 | } | |
1070 | case IPPROTO_SCTP: { | |
1071 | sctp_chunkhdr_t *sch, schunk; | |
1072 | ||
1073 | sch = skb_header_pointer(skb, iph->len + sizeof(sctp_sctphdr_t), | |
1074 | sizeof(schunk), &schunk); | |
1075 | if (sch == NULL) | |
1076 | return false; | |
1077 | return sch->type == SCTP_CID_INIT; | |
1078 | } | |
1079 | default: | |
1080 | return false; | |
1081 | } | |
1082 | } | |
1083 | ||
d752c364 MRL |
1084 | static inline bool is_new_conn_expected(const struct ip_vs_conn *cp, |
1085 | int conn_reuse_mode) | |
1086 | { | |
1087 | /* Controlled (FTP DATA or persistence)? */ | |
1088 | if (cp->control) | |
1089 | return false; | |
1090 | ||
1091 | switch (cp->protocol) { | |
1092 | case IPPROTO_TCP: | |
1093 | return (cp->state == IP_VS_TCP_S_TIME_WAIT) || | |
1094 | ((conn_reuse_mode & 2) && | |
1095 | (cp->state == IP_VS_TCP_S_FIN_WAIT) && | |
1096 | (cp->flags & IP_VS_CONN_F_NOOUTPUT)); | |
1097 | case IPPROTO_SCTP: | |
1098 | return cp->state == IP_VS_SCTP_S_CLOSED; | |
1099 | default: | |
1100 | return false; | |
1101 | } | |
1102 | } | |
1103 | ||
4856c84c | 1104 | /* Handle response packets: rewrite addresses and send away... |
4856c84c MT |
1105 | */ |
1106 | static unsigned int | |
9330419d | 1107 | handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, |
579eb62a JA |
1108 | struct ip_vs_conn *cp, struct ip_vs_iphdr *iph, |
1109 | unsigned int hooknum) | |
4856c84c | 1110 | { |
9330419d HS |
1111 | struct ip_vs_protocol *pp = pd->pp; |
1112 | ||
b0e010c5 | 1113 | IP_VS_DBG_PKT(11, af, pp, skb, iph->off, "Outgoing packet"); |
4856c84c | 1114 | |
d4383f04 | 1115 | if (!skb_make_writable(skb, iph->len)) |
4856c84c MT |
1116 | goto drop; |
1117 | ||
1118 | /* mangle the packet */ | |
d4383f04 | 1119 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph)) |
4856c84c MT |
1120 | goto drop; |
1121 | ||
1122 | #ifdef CONFIG_IP_VS_IPV6 | |
1123 | if (af == AF_INET6) | |
1124 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; | |
1125 | else | |
1126 | #endif | |
1127 | { | |
1128 | ip_hdr(skb)->saddr = cp->vaddr.ip; | |
1129 | ip_send_check(ip_hdr(skb)); | |
1130 | } | |
1131 | ||
8a803040 JA |
1132 | /* |
1133 | * nf_iterate does not expect change in the skb->dst->dev. | |
1134 | * It looks like it is not fatal to enable this code for hooks | |
1135 | * where our handlers are at the end of the chain list and | |
1136 | * when all next handlers use skb->dst->dev and not outdev. | |
1137 | * It will definitely route properly the inout NAT traffic | |
1138 | * when multiple paths are used. | |
1139 | */ | |
1140 | ||
4856c84c MT |
1141 | /* For policy routing, packets originating from this |
1142 | * machine itself may be routed differently to packets | |
1143 | * passing through. We want this packet to be routed as | |
1144 | * if it came from this machine itself. So re-compute | |
1145 | * the routing information. | |
1146 | */ | |
a43d1a6b | 1147 | if (ip_vs_route_me_harder(cp->ipvs, af, skb, hooknum)) |
ba4fd7e9 | 1148 | goto drop; |
4856c84c | 1149 | |
b0e010c5 | 1150 | IP_VS_DBG_PKT(10, af, pp, skb, iph->off, "After SNAT"); |
4856c84c MT |
1151 | |
1152 | ip_vs_out_stats(cp, skb); | |
9330419d | 1153 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); |
cf356d69 | 1154 | skb->ipvs_property = 1; |
f4bc17cd | 1155 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 1156 | ip_vs_notrack(skb); |
f4bc17cd JA |
1157 | else |
1158 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
1159 | ip_vs_conn_put(cp); |
1160 | ||
4856c84c MT |
1161 | LeaveFunction(11); |
1162 | return NF_ACCEPT; | |
1163 | ||
1164 | drop: | |
1165 | ip_vs_conn_put(cp); | |
1166 | kfree_skb(skb); | |
f4bc17cd | 1167 | LeaveFunction(11); |
4856c84c MT |
1168 | return NF_STOLEN; |
1169 | } | |
1170 | ||
1da177e4 | 1171 | /* |
4856c84c | 1172 | * Check if outgoing packet belongs to the established ip_vs_conn. |
1da177e4 LT |
1173 | */ |
1174 | static unsigned int | |
1b75097d | 1175 | ip_vs_out(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1176 | { |
1b75097d | 1177 | struct net *net = ipvs->net; |
51ef348b | 1178 | struct ip_vs_iphdr iph; |
1da177e4 | 1179 | struct ip_vs_protocol *pp; |
9330419d | 1180 | struct ip_vs_proto_data *pd; |
1da177e4 | 1181 | struct ip_vs_conn *cp; |
1da177e4 LT |
1182 | |
1183 | EnterFunction(11); | |
1184 | ||
fc604767 | 1185 | /* Already marked as IPVS request or reply? */ |
6869c4d8 | 1186 | if (skb->ipvs_property) |
1da177e4 LT |
1187 | return NF_ACCEPT; |
1188 | ||
fc604767 JA |
1189 | /* Bad... Do not break raw sockets */ |
1190 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1191 | af == AF_INET)) { | |
1192 | struct sock *sk = skb->sk; | |
1193 | struct inet_sock *inet = inet_sk(skb->sk); | |
1194 | ||
1195 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1196 | return NF_ACCEPT; | |
1197 | } | |
1198 | ||
1199 | if (unlikely(!skb_dst(skb))) | |
1200 | return NF_ACCEPT; | |
1201 | ||
48aed1b0 | 1202 | if (!ipvs->enable) |
7a4f0761 HS |
1203 | return NF_ACCEPT; |
1204 | ||
4fd9beef | 1205 | ip_vs_fill_iph_skb(af, skb, false, &iph); |
2a3b791e JV |
1206 | #ifdef CONFIG_IP_VS_IPV6 |
1207 | if (af == AF_INET6) { | |
1208 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1ca5bb54 | 1209 | int related; |
7b5f689a | 1210 | int verdict = ip_vs_out_icmp_v6(ipvs, skb, &related, |
d4383f04 | 1211 | hooknum, &iph); |
1da177e4 | 1212 | |
f5a41847 | 1213 | if (related) |
2a3b791e | 1214 | return verdict; |
2a3b791e JV |
1215 | } |
1216 | } else | |
1217 | #endif | |
1218 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 | 1219 | int related; |
7b5f689a | 1220 | int verdict = ip_vs_out_icmp(ipvs, skb, &related, hooknum); |
2a3b791e | 1221 | |
f5a41847 | 1222 | if (related) |
2a3b791e | 1223 | return verdict; |
2a3b791e | 1224 | } |
1da177e4 | 1225 | |
18d6ade6 | 1226 | pd = ip_vs_proto_data_get(ipvs, iph.protocol); |
9330419d | 1227 | if (unlikely(!pd)) |
1da177e4 | 1228 | return NF_ACCEPT; |
9330419d | 1229 | pp = pd->pp; |
1da177e4 LT |
1230 | |
1231 | /* reassemble IP fragments */ | |
2a3b791e | 1232 | #ifdef CONFIG_IP_VS_IPV6 |
63dca2c0 | 1233 | if (af == AF_INET) |
2a3b791e | 1234 | #endif |
56f8a75c | 1235 | if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) { |
57781c1c | 1236 | if (ip_vs_gather_frags(ipvs, skb, |
1ca5bb54 | 1237 | ip_vs_defrag_user(hooknum))) |
2a3b791e JV |
1238 | return NF_STOLEN; |
1239 | ||
4fd9beef | 1240 | ip_vs_fill_iph_skb(AF_INET, skb, false, &iph); |
2a3b791e | 1241 | } |
1da177e4 LT |
1242 | |
1243 | /* | |
1244 | * Check if the packet belongs to an existing entry | |
1245 | */ | |
0cf705c8 | 1246 | cp = pp->conn_out_get(ipvs, af, skb, &iph); |
1da177e4 | 1247 | |
cb59155f | 1248 | if (likely(cp)) |
579eb62a | 1249 | return handle_response(af, skb, pd, cp, &iph, hooknum); |
2300f045 | 1250 | if (sysctl_nat_icmp_send(ipvs) && |
cb59155f JA |
1251 | (pp->protocol == IPPROTO_TCP || |
1252 | pp->protocol == IPPROTO_UDP || | |
1253 | pp->protocol == IPPROTO_SCTP)) { | |
1254 | __be16 _ports[2], *pptr; | |
1255 | ||
2f74713d JDB |
1256 | pptr = frag_safe_skb_hp(skb, iph.len, |
1257 | sizeof(_ports), _ports, &iph); | |
cb59155f JA |
1258 | if (pptr == NULL) |
1259 | return NF_ACCEPT; /* Not for me */ | |
48aed1b0 | 1260 | if (ip_vs_has_real_service(ipvs, af, iph.protocol, &iph.saddr, |
276472ea | 1261 | pptr[0])) { |
cb59155f JA |
1262 | /* |
1263 | * Notify the real server: there is no | |
1264 | * existing entry if it is not RST | |
1265 | * packet or not TCP packet. | |
1266 | */ | |
1267 | if ((iph.protocol != IPPROTO_TCP && | |
1268 | iph.protocol != IPPROTO_SCTP) | |
1269 | || ((iph.protocol == IPPROTO_TCP | |
1270 | && !is_tcp_reset(skb, iph.len)) | |
1271 | || (iph.protocol == IPPROTO_SCTP | |
1272 | && !is_sctp_abort(skb, | |
1273 | iph.len)))) { | |
2a3b791e | 1274 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f | 1275 | if (af == AF_INET6) { |
cb59155f JA |
1276 | if (!skb->dev) |
1277 | skb->dev = net->loopback_dev; | |
1278 | icmpv6_send(skb, | |
1279 | ICMPV6_DEST_UNREACH, | |
1280 | ICMPV6_PORT_UNREACH, | |
1281 | 0); | |
1282 | } else | |
2a3b791e | 1283 | #endif |
cb59155f JA |
1284 | icmp_send(skb, |
1285 | ICMP_DEST_UNREACH, | |
1286 | ICMP_PORT_UNREACH, 0); | |
1287 | return NF_DROP; | |
1da177e4 LT |
1288 | } |
1289 | } | |
1da177e4 | 1290 | } |
b0e010c5 | 1291 | IP_VS_DBG_PKT(12, af, pp, skb, iph.off, |
cb59155f JA |
1292 | "ip_vs_out: packet continues traversal as normal"); |
1293 | return NF_ACCEPT; | |
1da177e4 LT |
1294 | } |
1295 | ||
fc604767 | 1296 | /* |
cb59155f JA |
1297 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1298 | * used only for VS/NAT. | |
fc604767 JA |
1299 | * Check if packet is reply for established ip_vs_conn. |
1300 | */ | |
1301 | static unsigned int | |
06198b34 | 1302 | ip_vs_reply4(void *priv, struct sk_buff *skb, |
238e54c9 | 1303 | const struct nf_hook_state *state) |
fc604767 | 1304 | { |
1b75097d | 1305 | return ip_vs_out(net_ipvs(state->net), state->hook, skb, AF_INET); |
fc604767 JA |
1306 | } |
1307 | ||
1308 | /* | |
1309 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1310 | * Check if packet is reply for established ip_vs_conn. | |
1311 | */ | |
1312 | static unsigned int | |
06198b34 | 1313 | ip_vs_local_reply4(void *priv, struct sk_buff *skb, |
238e54c9 | 1314 | const struct nf_hook_state *state) |
fc604767 | 1315 | { |
1b75097d | 1316 | return ip_vs_out(net_ipvs(state->net), state->hook, skb, AF_INET); |
fc604767 JA |
1317 | } |
1318 | ||
1319 | #ifdef CONFIG_IP_VS_IPV6 | |
1320 | ||
1321 | /* | |
cb59155f JA |
1322 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1323 | * used only for VS/NAT. | |
fc604767 JA |
1324 | * Check if packet is reply for established ip_vs_conn. |
1325 | */ | |
1326 | static unsigned int | |
06198b34 | 1327 | ip_vs_reply6(void *priv, struct sk_buff *skb, |
238e54c9 | 1328 | const struct nf_hook_state *state) |
fc604767 | 1329 | { |
1b75097d | 1330 | return ip_vs_out(net_ipvs(state->net), state->hook, skb, AF_INET6); |
fc604767 JA |
1331 | } |
1332 | ||
1333 | /* | |
1334 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1335 | * Check if packet is reply for established ip_vs_conn. | |
1336 | */ | |
1337 | static unsigned int | |
06198b34 | 1338 | ip_vs_local_reply6(void *priv, struct sk_buff *skb, |
238e54c9 | 1339 | const struct nf_hook_state *state) |
fc604767 | 1340 | { |
1b75097d | 1341 | return ip_vs_out(net_ipvs(state->net), state->hook, skb, AF_INET6); |
fc604767 JA |
1342 | } |
1343 | ||
1344 | #endif | |
1da177e4 | 1345 | |
3b5ca617 | 1346 | static unsigned int |
d8f44c33 EB |
1347 | ip_vs_try_to_schedule(struct netns_ipvs *ipvs, int af, struct sk_buff *skb, |
1348 | struct ip_vs_proto_data *pd, | |
3b5ca617 AG |
1349 | int *verdict, struct ip_vs_conn **cpp, |
1350 | struct ip_vs_iphdr *iph) | |
1351 | { | |
1352 | struct ip_vs_protocol *pp = pd->pp; | |
1353 | ||
1354 | if (!iph->fragoffs) { | |
1355 | /* No (second) fragments need to enter here, as nf_defrag_ipv6 | |
1356 | * replayed fragment zero will already have created the cp | |
1357 | */ | |
1358 | ||
1359 | /* Schedule and create new connection entry into cpp */ | |
d8f44c33 | 1360 | if (!pp->conn_schedule(ipvs, af, skb, pd, verdict, cpp, iph)) |
3b5ca617 AG |
1361 | return 0; |
1362 | } | |
1363 | ||
1364 | if (unlikely(!*cpp)) { | |
1365 | /* sorry, all this trouble for a no-hit :) */ | |
1366 | IP_VS_DBG_PKT(12, af, pp, skb, iph->off, | |
1367 | "ip_vs_in: packet continues traversal as normal"); | |
1368 | if (iph->fragoffs) { | |
1369 | /* Fragment that couldn't be mapped to a conn entry | |
1370 | * is missing module nf_defrag_ipv6 | |
1371 | */ | |
1372 | IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n"); | |
1373 | IP_VS_DBG_PKT(7, af, pp, skb, iph->off, | |
1374 | "unhandled fragment"); | |
1375 | } | |
1376 | *verdict = NF_ACCEPT; | |
1377 | return 0; | |
1378 | } | |
1379 | ||
1380 | return 1; | |
1381 | } | |
1382 | ||
1da177e4 LT |
1383 | /* |
1384 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
1385 | * Find any that might be relevant, check against existing connections, | |
1386 | * forward to the right destination host if relevant. | |
1387 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
1388 | */ | |
e905a9ed | 1389 | static int |
6f2bcea9 EB |
1390 | ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, |
1391 | unsigned int hooknum) | |
1da177e4 | 1392 | { |
1da177e4 LT |
1393 | struct iphdr *iph; |
1394 | struct icmphdr _icmph, *ic; | |
1395 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 1396 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
1397 | struct ip_vs_conn *cp; |
1398 | struct ip_vs_protocol *pp; | |
9330419d | 1399 | struct ip_vs_proto_data *pd; |
f2edb9f7 | 1400 | unsigned int offset, offset2, ihl, verdict; |
6044eeff | 1401 | bool ipip, new_cp = false; |
1da177e4 LT |
1402 | |
1403 | *related = 1; | |
1404 | ||
1405 | /* reassemble IP fragments */ | |
56f8a75c | 1406 | if (ip_is_fragment(ip_hdr(skb))) { |
57781c1c | 1407 | if (ip_vs_gather_frags(ipvs, skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 1408 | return NF_STOLEN; |
1da177e4 LT |
1409 | } |
1410 | ||
eddc9ec5 | 1411 | iph = ip_hdr(skb); |
1da177e4 LT |
1412 | offset = ihl = iph->ihl * 4; |
1413 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1414 | if (ic == NULL) | |
1415 | return NF_DROP; | |
1416 | ||
14d5e834 | 1417 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 1418 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 1419 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
1420 | |
1421 | /* | |
1422 | * Work through seeing if this is for us. | |
1423 | * These checks are supposed to be in an order that means easy | |
1424 | * things are checked first to speed up processing.... however | |
1425 | * this means that some packets will manage to get a long way | |
1426 | * down this stack and then be rejected, but that's life. | |
1427 | */ | |
1428 | if ((ic->type != ICMP_DEST_UNREACH) && | |
1429 | (ic->type != ICMP_SOURCE_QUENCH) && | |
1430 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
1431 | *related = 0; | |
1432 | return NF_ACCEPT; | |
1433 | } | |
1434 | ||
1435 | /* Now find the contained IP header */ | |
1436 | offset += sizeof(_icmph); | |
1437 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1438 | if (cih == NULL) | |
1439 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1440 | ||
f2edb9f7 JA |
1441 | /* Special case for errors for IPIP packets */ |
1442 | ipip = false; | |
1443 | if (cih->protocol == IPPROTO_IPIP) { | |
1444 | if (unlikely(cih->frag_off & htons(IP_OFFSET))) | |
1445 | return NF_ACCEPT; | |
1446 | /* Error for our IPIP must arrive at LOCAL_IN */ | |
1447 | if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL)) | |
1448 | return NF_ACCEPT; | |
1449 | offset += cih->ihl * 4; | |
1450 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1451 | if (cih == NULL) | |
1452 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1453 | ipip = true; | |
1454 | } | |
1455 | ||
18d6ade6 | 1456 | pd = ip_vs_proto_data_get(ipvs, cih->protocol); |
9330419d | 1457 | if (!pd) |
1da177e4 | 1458 | return NF_ACCEPT; |
9330419d | 1459 | pp = pd->pp; |
1da177e4 LT |
1460 | |
1461 | /* Is the embedded protocol header present? */ | |
4412ec49 | 1462 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
1463 | pp->dont_defrag)) |
1464 | return NF_ACCEPT; | |
1465 | ||
0d79641a JA |
1466 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
1467 | "Checking incoming ICMP for"); | |
1da177e4 | 1468 | |
f2edb9f7 | 1469 | offset2 = offset; |
4fd9beef | 1470 | ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, !ipip, &ciph); |
63dca2c0 | 1471 | offset = ciph.len; |
b0e010c5 | 1472 | |
f2edb9f7 JA |
1473 | /* The embedded headers contain source and dest in reverse order. |
1474 | * For IPIP this is error for request, not for reply. | |
1475 | */ | |
ab161976 | 1476 | cp = pp->conn_in_get(ipvs, AF_INET, skb, &ciph); |
6044eeff AG |
1477 | |
1478 | if (!cp) { | |
1479 | int v; | |
1480 | ||
a47b4300 | 1481 | if (!sysctl_schedule_icmp(ipvs)) |
6044eeff AG |
1482 | return NF_ACCEPT; |
1483 | ||
d8f44c33 | 1484 | if (!ip_vs_try_to_schedule(ipvs, AF_INET, skb, pd, &v, &cp, &ciph)) |
6044eeff AG |
1485 | return v; |
1486 | new_cp = true; | |
1487 | } | |
1da177e4 LT |
1488 | |
1489 | verdict = NF_DROP; | |
1490 | ||
1491 | /* Ensure the checksum is correct */ | |
60476372 | 1492 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 | 1493 | /* Failed checksum! */ |
14d5e834 HH |
1494 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
1495 | &iph->saddr); | |
1da177e4 LT |
1496 | goto out; |
1497 | } | |
1498 | ||
f2edb9f7 JA |
1499 | if (ipip) { |
1500 | __be32 info = ic->un.gateway; | |
f44a5f45 PC |
1501 | __u8 type = ic->type; |
1502 | __u8 code = ic->code; | |
f2edb9f7 JA |
1503 | |
1504 | /* Update the MTU */ | |
1505 | if (ic->type == ICMP_DEST_UNREACH && | |
1506 | ic->code == ICMP_FRAG_NEEDED) { | |
1507 | struct ip_vs_dest *dest = cp->dest; | |
1508 | u32 mtu = ntohs(ic->un.frag.mtu); | |
f44a5f45 | 1509 | __be16 frag_off = cih->frag_off; |
f2edb9f7 JA |
1510 | |
1511 | /* Strip outer IP and ICMP, go to IPIP header */ | |
f44a5f45 PC |
1512 | if (pskb_pull(skb, ihl + sizeof(_icmph)) == NULL) |
1513 | goto ignore_ipip; | |
f2edb9f7 JA |
1514 | offset2 -= ihl + sizeof(_icmph); |
1515 | skb_reset_network_header(skb); | |
1516 | IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n", | |
1517 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu); | |
6f2bcea9 | 1518 | ipv4_update_pmtu(skb, ipvs->net, |
f2edb9f7 | 1519 | mtu, 0, 0, 0, 0); |
f2edb9f7 | 1520 | /* Client uses PMTUD? */ |
f44a5f45 | 1521 | if (!(frag_off & htons(IP_DF))) |
f2edb9f7 JA |
1522 | goto ignore_ipip; |
1523 | /* Prefer the resulting PMTU */ | |
1524 | if (dest) { | |
026ace06 JA |
1525 | struct ip_vs_dest_dst *dest_dst; |
1526 | ||
1527 | rcu_read_lock(); | |
1528 | dest_dst = rcu_dereference(dest->dest_dst); | |
1529 | if (dest_dst) | |
1530 | mtu = dst_mtu(dest_dst->dst_cache); | |
1531 | rcu_read_unlock(); | |
f2edb9f7 JA |
1532 | } |
1533 | if (mtu > 68 + sizeof(struct iphdr)) | |
1534 | mtu -= sizeof(struct iphdr); | |
1535 | info = htonl(mtu); | |
1536 | } | |
1537 | /* Strip outer IP, ICMP and IPIP, go to IP header of | |
1538 | * original request. | |
1539 | */ | |
f44a5f45 PC |
1540 | if (pskb_pull(skb, offset2) == NULL) |
1541 | goto ignore_ipip; | |
f2edb9f7 JA |
1542 | skb_reset_network_header(skb); |
1543 | IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n", | |
1544 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
f44a5f45 PC |
1545 | type, code, ntohl(info)); |
1546 | icmp_send(skb, type, code, info); | |
f2edb9f7 JA |
1547 | /* ICMP can be shorter but anyways, account it */ |
1548 | ip_vs_out_stats(cp, skb); | |
1549 | ||
1550 | ignore_ipip: | |
1551 | consume_skb(skb); | |
1552 | verdict = NF_STOLEN; | |
1553 | goto out; | |
1554 | } | |
1555 | ||
1da177e4 LT |
1556 | /* do the statistics and put it back */ |
1557 | ip_vs_in_stats(cp, skb); | |
06f3d7f9 JA |
1558 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol || |
1559 | IPPROTO_SCTP == cih->protocol) | |
1da177e4 | 1560 | offset += 2 * sizeof(__u16); |
d4383f04 | 1561 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph); |
1da177e4 | 1562 | |
552ad65a | 1563 | out: |
6044eeff AG |
1564 | if (likely(!new_cp)) |
1565 | __ip_vs_conn_put(cp); | |
1566 | else | |
1567 | ip_vs_conn_put(cp); | |
1da177e4 LT |
1568 | |
1569 | return verdict; | |
1570 | } | |
1571 | ||
2a3b791e | 1572 | #ifdef CONFIG_IP_VS_IPV6 |
6f2bcea9 EB |
1573 | static int ip_vs_in_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb, |
1574 | int *related, unsigned int hooknum, | |
1575 | struct ip_vs_iphdr *iph) | |
2a3b791e | 1576 | { |
2a3b791e | 1577 | struct icmp6hdr _icmph, *ic; |
63dca2c0 | 1578 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
2a3b791e JV |
1579 | struct ip_vs_conn *cp; |
1580 | struct ip_vs_protocol *pp; | |
9330419d | 1581 | struct ip_vs_proto_data *pd; |
b0e010c5 | 1582 | unsigned int offset, verdict; |
6044eeff | 1583 | bool new_cp = false; |
2a3b791e | 1584 | |
63dca2c0 | 1585 | *related = 1; |
2a3b791e | 1586 | |
2f74713d | 1587 | ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph, iph); |
2a3b791e JV |
1588 | if (ic == NULL) |
1589 | return NF_DROP; | |
1590 | ||
2a3b791e JV |
1591 | /* |
1592 | * Work through seeing if this is for us. | |
1593 | * These checks are supposed to be in an order that means easy | |
1594 | * things are checked first to speed up processing.... however | |
1595 | * this means that some packets will manage to get a long way | |
1596 | * down this stack and then be rejected, but that's life. | |
1597 | */ | |
2fab8917 | 1598 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
2a3b791e JV |
1599 | *related = 0; |
1600 | return NF_ACCEPT; | |
1601 | } | |
2f74713d JDB |
1602 | /* Fragment header that is before ICMP header tells us that: |
1603 | * it's not an error message since they can't be fragmented. | |
1604 | */ | |
e7165030 | 1605 | if (iph->flags & IP6_FH_F_FRAG) |
2f74713d | 1606 | return NF_DROP; |
2a3b791e | 1607 | |
63dca2c0 JDB |
1608 | IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
1609 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
1610 | &iph->saddr, &iph->daddr); | |
1611 | ||
b0e010c5 | 1612 | offset = iph->len + sizeof(_icmph); |
4fd9beef | 1613 | if (!ip_vs_fill_iph_skb_icmp(AF_INET6, skb, offset, true, &ciph)) |
b0e010c5 | 1614 | return NF_ACCEPT; |
2a3b791e | 1615 | |
18d6ade6 | 1616 | pd = ip_vs_proto_data_get(ipvs, ciph.protocol); |
9330419d | 1617 | if (!pd) |
2a3b791e | 1618 | return NF_ACCEPT; |
9330419d | 1619 | pp = pd->pp; |
2a3b791e | 1620 | |
63dca2c0 JDB |
1621 | /* Cannot handle fragmented embedded protocol */ |
1622 | if (ciph.fragoffs) | |
2a3b791e JV |
1623 | return NF_ACCEPT; |
1624 | ||
b0e010c5 | 1625 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offset, |
0d79641a | 1626 | "Checking incoming ICMPv6 for"); |
2a3b791e | 1627 | |
2f74713d JDB |
1628 | /* The embedded headers contain source and dest in reverse order |
1629 | * if not from localhost | |
1630 | */ | |
ab161976 | 1631 | cp = pp->conn_in_get(ipvs, AF_INET6, skb, &ciph); |
2f74713d | 1632 | |
6044eeff AG |
1633 | if (!cp) { |
1634 | int v; | |
1635 | ||
a47b4300 | 1636 | if (!sysctl_schedule_icmp(ipvs)) |
6044eeff AG |
1637 | return NF_ACCEPT; |
1638 | ||
d8f44c33 | 1639 | if (!ip_vs_try_to_schedule(ipvs, AF_INET6, skb, pd, &v, &cp, &ciph)) |
6044eeff AG |
1640 | return v; |
1641 | ||
1642 | new_cp = true; | |
1643 | } | |
1644 | ||
2f74713d JDB |
1645 | /* VS/TUN, VS/DR and LOCALNODE just let it go */ |
1646 | if ((hooknum == NF_INET_LOCAL_OUT) && | |
1647 | (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) { | |
6044eeff AG |
1648 | verdict = NF_ACCEPT; |
1649 | goto out; | |
2f74713d | 1650 | } |
2a3b791e | 1651 | |
2a3b791e JV |
1652 | /* do the statistics and put it back */ |
1653 | ip_vs_in_stats(cp, skb); | |
63dca2c0 JDB |
1654 | |
1655 | /* Need to mangle contained IPv6 header in ICMPv6 packet */ | |
b0e010c5 | 1656 | offset = ciph.len; |
63dca2c0 JDB |
1657 | if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol || |
1658 | IPPROTO_SCTP == ciph.protocol) | |
b0e010c5 | 1659 | offset += 2 * sizeof(__u16); /* Also mangle ports */ |
63dca2c0 | 1660 | |
b0e010c5 | 1661 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset, hooknum, &ciph); |
2a3b791e | 1662 | |
6044eeff AG |
1663 | out: |
1664 | if (likely(!new_cp)) | |
1665 | __ip_vs_conn_put(cp); | |
1666 | else | |
1667 | ip_vs_conn_put(cp); | |
2a3b791e JV |
1668 | |
1669 | return verdict; | |
1670 | } | |
1671 | #endif | |
1672 | ||
1673 | ||
1da177e4 LT |
1674 | /* |
1675 | * Check if it's for virtual services, look it up, | |
1676 | * and send it on its way... | |
1677 | */ | |
1678 | static unsigned int | |
6e385bb3 | 1679 | ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1680 | { |
51ef348b | 1681 | struct ip_vs_iphdr iph; |
1da177e4 | 1682 | struct ip_vs_protocol *pp; |
9330419d | 1683 | struct ip_vs_proto_data *pd; |
1da177e4 | 1684 | struct ip_vs_conn *cp; |
4a516f11 | 1685 | int ret, pkts; |
d752c364 | 1686 | int conn_reuse_mode; |
2a3b791e | 1687 | |
fc604767 JA |
1688 | /* Already marked as IPVS request or reply? */ |
1689 | if (skb->ipvs_property) | |
1690 | return NF_ACCEPT; | |
1691 | ||
1da177e4 | 1692 | /* |
cb59155f JA |
1693 | * Big tappo: |
1694 | * - remote client: only PACKET_HOST | |
1695 | * - route: used for struct net when skb->dev is unset | |
1da177e4 | 1696 | */ |
cb59155f JA |
1697 | if (unlikely((skb->pkt_type != PACKET_HOST && |
1698 | hooknum != NF_INET_LOCAL_OUT) || | |
1699 | !skb_dst(skb))) { | |
4fd9beef | 1700 | ip_vs_fill_iph_skb(af, skb, false, &iph); |
cb59155f JA |
1701 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s" |
1702 | " ignored in hook %u\n", | |
1703 | skb->pkt_type, iph.protocol, | |
1704 | IP_VS_DBG_ADDR(af, &iph.daddr), hooknum); | |
1da177e4 LT |
1705 | return NF_ACCEPT; |
1706 | } | |
7a4f0761 | 1707 | /* ipvs enabled in this netns ? */ |
0c12582f | 1708 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
7a4f0761 HS |
1709 | return NF_ACCEPT; |
1710 | ||
4fd9beef | 1711 | ip_vs_fill_iph_skb(af, skb, false, &iph); |
cb59155f JA |
1712 | |
1713 | /* Bad... Do not break raw sockets */ | |
1714 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1715 | af == AF_INET)) { | |
1716 | struct sock *sk = skb->sk; | |
1717 | struct inet_sock *inet = inet_sk(skb->sk); | |
1718 | ||
1719 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1720 | return NF_ACCEPT; | |
1721 | } | |
1da177e4 | 1722 | |
94b26551 JV |
1723 | #ifdef CONFIG_IP_VS_IPV6 |
1724 | if (af == AF_INET6) { | |
1725 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1ca5bb54 | 1726 | int related; |
6f2bcea9 EB |
1727 | int verdict = ip_vs_in_icmp_v6(ipvs, skb, &related, |
1728 | hooknum, &iph); | |
1da177e4 | 1729 | |
94b26551 JV |
1730 | if (related) |
1731 | return verdict; | |
94b26551 JV |
1732 | } |
1733 | } else | |
1734 | #endif | |
1735 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 | 1736 | int related; |
6f2bcea9 EB |
1737 | int verdict = ip_vs_in_icmp(ipvs, skb, &related, |
1738 | hooknum); | |
94b26551 JV |
1739 | |
1740 | if (related) | |
1741 | return verdict; | |
94b26551 | 1742 | } |
1da177e4 LT |
1743 | |
1744 | /* Protocol supported? */ | |
18d6ade6 | 1745 | pd = ip_vs_proto_data_get(ipvs, iph.protocol); |
4e478098 AG |
1746 | if (unlikely(!pd)) { |
1747 | /* The only way we'll see this packet again is if it's | |
1748 | * encapsulated, so mark it with ipvs_property=1 so we | |
1749 | * skip it if we're ignoring tunneled packets | |
1750 | */ | |
1751 | if (sysctl_ignore_tunneled(ipvs)) | |
1752 | skb->ipvs_property = 1; | |
1753 | ||
1da177e4 | 1754 | return NF_ACCEPT; |
4e478098 | 1755 | } |
9330419d | 1756 | pp = pd->pp; |
1da177e4 LT |
1757 | /* |
1758 | * Check if the packet belongs to an existing connection entry | |
1759 | */ | |
ab161976 | 1760 | cp = pp->conn_in_get(ipvs, af, skb, &iph); |
dc7b3eb9 | 1761 | |
d752c364 MRL |
1762 | conn_reuse_mode = sysctl_conn_reuse_mode(ipvs); |
1763 | if (conn_reuse_mode && !iph.fragoffs && | |
1764 | is_new_conn(skb, &iph) && cp && | |
1765 | ((unlikely(sysctl_expire_nodest_conn(ipvs)) && cp->dest && | |
1766 | unlikely(!atomic_read(&cp->dest->weight))) || | |
1767 | unlikely(is_new_conn_expected(cp, conn_reuse_mode)))) { | |
1768 | if (!atomic_read(&cp->n_control)) | |
1769 | ip_vs_conn_expire_now(cp); | |
dc7b3eb9 GL |
1770 | __ip_vs_conn_put(cp); |
1771 | cp = NULL; | |
1772 | } | |
1773 | ||
3b5ca617 | 1774 | if (unlikely(!cp)) { |
1da177e4 LT |
1775 | int v; |
1776 | ||
d8f44c33 | 1777 | if (!ip_vs_try_to_schedule(ipvs, af, skb, pd, &v, &cp, &iph)) |
1da177e4 LT |
1778 | return v; |
1779 | } | |
1780 | ||
b0e010c5 | 1781 | IP_VS_DBG_PKT(11, af, pp, skb, iph.off, "Incoming packet"); |
3b5ca617 | 1782 | |
1da177e4 LT |
1783 | /* Check the server status */ |
1784 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
1785 | /* the destination server is not available */ | |
1786 | ||
71a8ab6c | 1787 | if (sysctl_expire_nodest_conn(ipvs)) { |
1da177e4 LT |
1788 | /* try to expire the connection immediately */ |
1789 | ip_vs_conn_expire_now(cp); | |
1da177e4 | 1790 | } |
dc8103f2 JA |
1791 | /* don't restart its timer, and silently |
1792 | drop the packet. */ | |
1793 | __ip_vs_conn_put(cp); | |
1da177e4 LT |
1794 | return NF_DROP; |
1795 | } | |
1796 | ||
1797 | ip_vs_in_stats(cp, skb); | |
4a516f11 | 1798 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 | 1799 | if (cp->packet_xmit) |
d4383f04 | 1800 | ret = cp->packet_xmit(skb, cp, pp, &iph); |
1da177e4 LT |
1801 | /* do not touch skb anymore */ |
1802 | else { | |
1803 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
1804 | ret = NF_ACCEPT; | |
1805 | } | |
1806 | ||
efac5276 RB |
1807 | /* Increase its packet counter and check if it is needed |
1808 | * to be synchronized | |
1809 | * | |
1810 | * Sync connection if it is about to close to | |
1811 | * encorage the standby servers to update the connections timeout | |
986a0757 HS |
1812 | * |
1813 | * For ONE_PKT let ip_vs_sync_conn() do the filter work. | |
efac5276 | 1814 | */ |
f131315f | 1815 | |
986a0757 | 1816 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
59e0350e | 1817 | pkts = sysctl_sync_threshold(ipvs); |
986a0757 HS |
1818 | else |
1819 | pkts = atomic_add_return(1, &cp->in_pkts); | |
1820 | ||
749c42b6 | 1821 | if (ipvs->sync_state & IP_VS_STATE_MASTER) |
b61a8c1a | 1822 | ip_vs_sync_conn(ipvs, cp, pkts); |
1da177e4 LT |
1823 | |
1824 | ip_vs_conn_put(cp); | |
1825 | return ret; | |
1826 | } | |
1827 | ||
cb59155f JA |
1828 | /* |
1829 | * AF_INET handler in NF_INET_LOCAL_IN chain | |
1830 | * Schedule and forward packets from remote clients | |
1831 | */ | |
1832 | static unsigned int | |
06198b34 | 1833 | ip_vs_remote_request4(void *priv, struct sk_buff *skb, |
238e54c9 | 1834 | const struct nf_hook_state *state) |
cb59155f | 1835 | { |
6e385bb3 | 1836 | return ip_vs_in(net_ipvs(state->net), state->hook, skb, AF_INET); |
cb59155f JA |
1837 | } |
1838 | ||
1839 | /* | |
1840 | * AF_INET handler in NF_INET_LOCAL_OUT chain | |
1841 | * Schedule and forward packets from local clients | |
1842 | */ | |
1843 | static unsigned int | |
06198b34 | 1844 | ip_vs_local_request4(void *priv, struct sk_buff *skb, |
238e54c9 | 1845 | const struct nf_hook_state *state) |
cb59155f | 1846 | { |
6e385bb3 | 1847 | return ip_vs_in(net_ipvs(state->net), state->hook, skb, AF_INET); |
cb59155f JA |
1848 | } |
1849 | ||
1850 | #ifdef CONFIG_IP_VS_IPV6 | |
1851 | ||
1852 | /* | |
1853 | * AF_INET6 handler in NF_INET_LOCAL_IN chain | |
1854 | * Schedule and forward packets from remote clients | |
1855 | */ | |
1856 | static unsigned int | |
06198b34 | 1857 | ip_vs_remote_request6(void *priv, struct sk_buff *skb, |
238e54c9 | 1858 | const struct nf_hook_state *state) |
cb59155f | 1859 | { |
6e385bb3 | 1860 | return ip_vs_in(net_ipvs(state->net), state->hook, skb, AF_INET6); |
cb59155f JA |
1861 | } |
1862 | ||
1863 | /* | |
1864 | * AF_INET6 handler in NF_INET_LOCAL_OUT chain | |
1865 | * Schedule and forward packets from local clients | |
1866 | */ | |
1867 | static unsigned int | |
06198b34 | 1868 | ip_vs_local_request6(void *priv, struct sk_buff *skb, |
238e54c9 | 1869 | const struct nf_hook_state *state) |
cb59155f | 1870 | { |
6e385bb3 | 1871 | return ip_vs_in(net_ipvs(state->net), state->hook, skb, AF_INET6); |
cb59155f JA |
1872 | } |
1873 | ||
1874 | #endif | |
1875 | ||
1da177e4 LT |
1876 | |
1877 | /* | |
6e23ae2a | 1878 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
1da177e4 LT |
1879 | * related packets destined for 0.0.0.0/0. |
1880 | * When fwmark-based virtual service is used, such as transparent | |
1881 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1882 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
6e23ae2a | 1883 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
1da177e4 LT |
1884 | * and send them to ip_vs_in_icmp. |
1885 | */ | |
1886 | static unsigned int | |
06198b34 | 1887 | ip_vs_forward_icmp(void *priv, struct sk_buff *skb, |
238e54c9 | 1888 | const struct nf_hook_state *state) |
1da177e4 LT |
1889 | { |
1890 | int r; | |
6f2bcea9 | 1891 | struct netns_ipvs *ipvs = net_ipvs(state->net); |
1da177e4 | 1892 | |
3db05fea | 1893 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
1da177e4 LT |
1894 | return NF_ACCEPT; |
1895 | ||
7a4f0761 | 1896 | /* ipvs enabled in this netns ? */ |
0c12582f | 1897 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
7a4f0761 HS |
1898 | return NF_ACCEPT; |
1899 | ||
6f2bcea9 | 1900 | return ip_vs_in_icmp(ipvs, skb, &r, state->hook); |
1da177e4 LT |
1901 | } |
1902 | ||
2a3b791e JV |
1903 | #ifdef CONFIG_IP_VS_IPV6 |
1904 | static unsigned int | |
06198b34 | 1905 | ip_vs_forward_icmp_v6(void *priv, struct sk_buff *skb, |
238e54c9 | 1906 | const struct nf_hook_state *state) |
2a3b791e JV |
1907 | { |
1908 | int r; | |
6f2bcea9 | 1909 | struct netns_ipvs *ipvs = net_ipvs(state->net); |
63dca2c0 | 1910 | struct ip_vs_iphdr iphdr; |
2a3b791e | 1911 | |
4fd9beef | 1912 | ip_vs_fill_iph_skb(AF_INET6, skb, false, &iphdr); |
63dca2c0 | 1913 | if (iphdr.protocol != IPPROTO_ICMPV6) |
2a3b791e JV |
1914 | return NF_ACCEPT; |
1915 | ||
7a4f0761 | 1916 | /* ipvs enabled in this netns ? */ |
0c12582f | 1917 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) |
7a4f0761 HS |
1918 | return NF_ACCEPT; |
1919 | ||
6f2bcea9 | 1920 | return ip_vs_in_icmp_v6(ipvs, skb, &r, state->hook, &iphdr); |
2a3b791e JV |
1921 | } |
1922 | #endif | |
1923 | ||
1da177e4 | 1924 | |
1999414a | 1925 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
cb59155f JA |
1926 | /* After packet filtering, change source only for VS/NAT */ |
1927 | { | |
1928 | .hook = ip_vs_reply4, | |
1929 | .owner = THIS_MODULE, | |
4c809d63 | 1930 | .pf = NFPROTO_IPV4, |
cb59155f | 1931 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1932 | .priority = NF_IP_PRI_NAT_SRC - 2, |
cb59155f | 1933 | }, |
41c5b317 PM |
1934 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1935 | * or VS/NAT(change destination), so that filtering rules can be | |
1936 | * applied to IPVS. */ | |
1937 | { | |
cb59155f | 1938 | .hook = ip_vs_remote_request4, |
41c5b317 | 1939 | .owner = THIS_MODULE, |
4c809d63 | 1940 | .pf = NFPROTO_IPV4, |
cb59155f | 1941 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1942 | .priority = NF_IP_PRI_NAT_SRC - 1, |
41c5b317 | 1943 | }, |
fc604767 | 1944 | /* Before ip_vs_in, change source only for VS/NAT */ |
41c5b317 | 1945 | { |
fc604767 | 1946 | .hook = ip_vs_local_reply4, |
41c5b317 | 1947 | .owner = THIS_MODULE, |
4c809d63 | 1948 | .pf = NFPROTO_IPV4, |
fc604767 | 1949 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1950 | .priority = NF_IP_PRI_NAT_DST + 1, |
41c5b317 | 1951 | }, |
cb59155f JA |
1952 | /* After mangle, schedule and forward local requests */ |
1953 | { | |
1954 | .hook = ip_vs_local_request4, | |
1955 | .owner = THIS_MODULE, | |
4c809d63 | 1956 | .pf = NFPROTO_IPV4, |
cb59155f | 1957 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1958 | .priority = NF_IP_PRI_NAT_DST + 2, |
cb59155f | 1959 | }, |
41c5b317 PM |
1960 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1961 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1962 | { | |
1963 | .hook = ip_vs_forward_icmp, | |
1964 | .owner = THIS_MODULE, | |
4c809d63 | 1965 | .pf = NFPROTO_IPV4, |
cb59155f JA |
1966 | .hooknum = NF_INET_FORWARD, |
1967 | .priority = 99, | |
41c5b317 | 1968 | }, |
fc604767 JA |
1969 | /* After packet filtering, change source only for VS/NAT */ |
1970 | { | |
1971 | .hook = ip_vs_reply4, | |
1972 | .owner = THIS_MODULE, | |
4c809d63 | 1973 | .pf = NFPROTO_IPV4, |
fc604767 JA |
1974 | .hooknum = NF_INET_FORWARD, |
1975 | .priority = 100, | |
1976 | }, | |
473b23d3 | 1977 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f JA |
1978 | /* After packet filtering, change source only for VS/NAT */ |
1979 | { | |
1980 | .hook = ip_vs_reply6, | |
1981 | .owner = THIS_MODULE, | |
4c809d63 | 1982 | .pf = NFPROTO_IPV6, |
cb59155f | 1983 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1984 | .priority = NF_IP6_PRI_NAT_SRC - 2, |
cb59155f | 1985 | }, |
473b23d3 JV |
1986 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1987 | * or VS/NAT(change destination), so that filtering rules can be | |
1988 | * applied to IPVS. */ | |
1989 | { | |
cb59155f | 1990 | .hook = ip_vs_remote_request6, |
473b23d3 | 1991 | .owner = THIS_MODULE, |
4c809d63 | 1992 | .pf = NFPROTO_IPV6, |
cb59155f | 1993 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1994 | .priority = NF_IP6_PRI_NAT_SRC - 1, |
473b23d3 | 1995 | }, |
fc604767 | 1996 | /* Before ip_vs_in, change source only for VS/NAT */ |
473b23d3 | 1997 | { |
fc604767 | 1998 | .hook = ip_vs_local_reply6, |
473b23d3 | 1999 | .owner = THIS_MODULE, |
eb90b0c7 | 2000 | .pf = NFPROTO_IPV6, |
fc604767 | 2001 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 2002 | .priority = NF_IP6_PRI_NAT_DST + 1, |
473b23d3 | 2003 | }, |
cb59155f JA |
2004 | /* After mangle, schedule and forward local requests */ |
2005 | { | |
2006 | .hook = ip_vs_local_request6, | |
2007 | .owner = THIS_MODULE, | |
4c809d63 | 2008 | .pf = NFPROTO_IPV6, |
cb59155f | 2009 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 2010 | .priority = NF_IP6_PRI_NAT_DST + 2, |
cb59155f | 2011 | }, |
473b23d3 JV |
2012 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
2013 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
2014 | { | |
2015 | .hook = ip_vs_forward_icmp_v6, | |
2016 | .owner = THIS_MODULE, | |
4c809d63 | 2017 | .pf = NFPROTO_IPV6, |
cb59155f JA |
2018 | .hooknum = NF_INET_FORWARD, |
2019 | .priority = 99, | |
473b23d3 | 2020 | }, |
fc604767 JA |
2021 | /* After packet filtering, change source only for VS/NAT */ |
2022 | { | |
2023 | .hook = ip_vs_reply6, | |
2024 | .owner = THIS_MODULE, | |
4c809d63 | 2025 | .pf = NFPROTO_IPV6, |
fc604767 JA |
2026 | .hooknum = NF_INET_FORWARD, |
2027 | .priority = 100, | |
2028 | }, | |
473b23d3 | 2029 | #endif |
1da177e4 | 2030 | }; |
61b1ab45 HS |
2031 | /* |
2032 | * Initialize IP Virtual Server netns mem. | |
2033 | */ | |
2034 | static int __net_init __ip_vs_init(struct net *net) | |
2035 | { | |
2036 | struct netns_ipvs *ipvs; | |
2037 | ||
61b1ab45 | 2038 | ipvs = net_generic(net, ip_vs_net_id); |
0a9ee813 | 2039 | if (ipvs == NULL) |
61b1ab45 | 2040 | return -ENOMEM; |
0a9ee813 | 2041 | |
7a4f0761 HS |
2042 | /* Hold the beast until a service is registerd */ |
2043 | ipvs->enable = 0; | |
f6340ee0 | 2044 | ipvs->net = net; |
61b1ab45 HS |
2045 | /* Counters used for creating unique names */ |
2046 | ipvs->gen = atomic_read(&ipvs_netns_cnt); | |
2047 | atomic_inc(&ipvs_netns_cnt); | |
2048 | net->ipvs = ipvs; | |
7a4f0761 | 2049 | |
a4dd0360 | 2050 | if (ip_vs_estimator_net_init(ipvs) < 0) |
7a4f0761 HS |
2051 | goto estimator_fail; |
2052 | ||
3d993766 | 2053 | if (ip_vs_control_net_init(ipvs) < 0) |
7a4f0761 HS |
2054 | goto control_fail; |
2055 | ||
7d1f88ec | 2056 | if (ip_vs_protocol_net_init(ipvs) < 0) |
7a4f0761 HS |
2057 | goto protocol_fail; |
2058 | ||
b5dd212c | 2059 | if (ip_vs_app_net_init(ipvs) < 0) |
7a4f0761 HS |
2060 | goto app_fail; |
2061 | ||
2f3edc6a | 2062 | if (ip_vs_conn_net_init(ipvs) < 0) |
7a4f0761 HS |
2063 | goto conn_fail; |
2064 | ||
802cb437 | 2065 | if (ip_vs_sync_net_init(ipvs) < 0) |
7a4f0761 HS |
2066 | goto sync_fail; |
2067 | ||
a870c8c5 | 2068 | printk(KERN_INFO "IPVS: Creating netns size=%zu id=%d\n", |
61b1ab45 HS |
2069 | sizeof(struct netns_ipvs), ipvs->gen); |
2070 | return 0; | |
7a4f0761 HS |
2071 | /* |
2072 | * Error handling | |
2073 | */ | |
2074 | ||
2075 | sync_fail: | |
2f3edc6a | 2076 | ip_vs_conn_net_cleanup(ipvs); |
7a4f0761 | 2077 | conn_fail: |
b5dd212c | 2078 | ip_vs_app_net_cleanup(ipvs); |
7a4f0761 | 2079 | app_fail: |
7d1f88ec | 2080 | ip_vs_protocol_net_cleanup(ipvs); |
7a4f0761 | 2081 | protocol_fail: |
3d993766 | 2082 | ip_vs_control_net_cleanup(ipvs); |
7a4f0761 | 2083 | control_fail: |
a4dd0360 | 2084 | ip_vs_estimator_net_cleanup(ipvs); |
7a4f0761 | 2085 | estimator_fail: |
39f618b4 | 2086 | net->ipvs = NULL; |
7a4f0761 | 2087 | return -ENOMEM; |
61b1ab45 HS |
2088 | } |
2089 | ||
2090 | static void __net_exit __ip_vs_cleanup(struct net *net) | |
2091 | { | |
56d2169b EB |
2092 | struct netns_ipvs *ipvs = net_ipvs(net); |
2093 | ||
2094 | ip_vs_service_net_cleanup(ipvs); /* ip_vs_flush() with locks */ | |
2f3edc6a | 2095 | ip_vs_conn_net_cleanup(ipvs); |
b5dd212c | 2096 | ip_vs_app_net_cleanup(ipvs); |
7d1f88ec | 2097 | ip_vs_protocol_net_cleanup(ipvs); |
3d993766 | 2098 | ip_vs_control_net_cleanup(ipvs); |
a4dd0360 | 2099 | ip_vs_estimator_net_cleanup(ipvs); |
56d2169b | 2100 | IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen); |
39f618b4 | 2101 | net->ipvs = NULL; |
61b1ab45 HS |
2102 | } |
2103 | ||
7a4f0761 HS |
2104 | static void __net_exit __ip_vs_dev_cleanup(struct net *net) |
2105 | { | |
ebea1f7c | 2106 | struct netns_ipvs *ipvs = net_ipvs(net); |
7a4f0761 | 2107 | EnterFunction(2); |
ebea1f7c | 2108 | ipvs->enable = 0; /* Disable packet reception */ |
8f4e0a18 | 2109 | smp_wmb(); |
ebea1f7c | 2110 | ip_vs_sync_net_cleanup(ipvs); |
7a4f0761 HS |
2111 | LeaveFunction(2); |
2112 | } | |
2113 | ||
61b1ab45 HS |
2114 | static struct pernet_operations ipvs_core_ops = { |
2115 | .init = __ip_vs_init, | |
2116 | .exit = __ip_vs_cleanup, | |
2117 | .id = &ip_vs_net_id, | |
2118 | .size = sizeof(struct netns_ipvs), | |
2119 | }; | |
1da177e4 | 2120 | |
7a4f0761 HS |
2121 | static struct pernet_operations ipvs_core_dev_ops = { |
2122 | .exit = __ip_vs_dev_cleanup, | |
2123 | }; | |
2124 | ||
1da177e4 LT |
2125 | /* |
2126 | * Initialize IP Virtual Server | |
2127 | */ | |
2128 | static int __init ip_vs_init(void) | |
2129 | { | |
2130 | int ret; | |
2131 | ||
2132 | ret = ip_vs_control_init(); | |
2133 | if (ret < 0) { | |
1e3e238e | 2134 | pr_err("can't setup control.\n"); |
6c8f7949 | 2135 | goto exit; |
1da177e4 LT |
2136 | } |
2137 | ||
2138 | ip_vs_protocol_init(); | |
2139 | ||
1da177e4 LT |
2140 | ret = ip_vs_conn_init(); |
2141 | if (ret < 0) { | |
1e3e238e | 2142 | pr_err("can't setup connection table.\n"); |
6c8f7949 | 2143 | goto cleanup_protocol; |
61b1ab45 HS |
2144 | } |
2145 | ||
7a4f0761 HS |
2146 | ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */ |
2147 | if (ret < 0) | |
6c8f7949 | 2148 | goto cleanup_conn; |
7a4f0761 HS |
2149 | |
2150 | ret = register_pernet_device(&ipvs_core_dev_ops); | |
2151 | if (ret < 0) | |
2152 | goto cleanup_sub; | |
2153 | ||
41c5b317 | 2154 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 | 2155 | if (ret < 0) { |
1e3e238e | 2156 | pr_err("can't register hooks.\n"); |
7a4f0761 | 2157 | goto cleanup_dev; |
1da177e4 LT |
2158 | } |
2159 | ||
8537de8a HS |
2160 | ret = ip_vs_register_nl_ioctl(); |
2161 | if (ret < 0) { | |
2162 | pr_err("can't register netlink/ioctl.\n"); | |
2163 | goto cleanup_hooks; | |
2164 | } | |
2165 | ||
1e3e238e | 2166 | pr_info("ipvs loaded.\n"); |
7a4f0761 | 2167 | |
1da177e4 LT |
2168 | return ret; |
2169 | ||
8537de8a HS |
2170 | cleanup_hooks: |
2171 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); | |
7a4f0761 HS |
2172 | cleanup_dev: |
2173 | unregister_pernet_device(&ipvs_core_dev_ops); | |
2174 | cleanup_sub: | |
2175 | unregister_pernet_subsys(&ipvs_core_ops); | |
552ad65a | 2176 | cleanup_conn: |
1da177e4 | 2177 | ip_vs_conn_cleanup(); |
552ad65a | 2178 | cleanup_protocol: |
1da177e4 LT |
2179 | ip_vs_protocol_cleanup(); |
2180 | ip_vs_control_cleanup(); | |
6c8f7949 | 2181 | exit: |
1da177e4 LT |
2182 | return ret; |
2183 | } | |
2184 | ||
2185 | static void __exit ip_vs_cleanup(void) | |
2186 | { | |
8537de8a | 2187 | ip_vs_unregister_nl_ioctl(); |
41c5b317 | 2188 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
7a4f0761 HS |
2189 | unregister_pernet_device(&ipvs_core_dev_ops); |
2190 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ | |
1da177e4 | 2191 | ip_vs_conn_cleanup(); |
1da177e4 LT |
2192 | ip_vs_protocol_cleanup(); |
2193 | ip_vs_control_cleanup(); | |
1e3e238e | 2194 | pr_info("ipvs unloaded.\n"); |
1da177e4 LT |
2195 | } |
2196 | ||
2197 | module_init(ip_vs_init); | |
2198 | module_exit(ip_vs_cleanup); | |
2199 | MODULE_LICENSE("GPL"); |