Commit | Line | Data |
---|---|---|
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) | |
0a925864 JA |
238 | ipv6_addr_prefix(&snet.in6, &iph->saddr.in6, |
239 | (__force __u32) svc->netmask); | |
cd17f9ed JV |
240 | else |
241 | #endif | |
d4383f04 | 242 | snet.ip = iph->saddr.ip & svc->netmask; |
1da177e4 | 243 | |
cd17f9ed JV |
244 | IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " |
245 | "mnet %s\n", | |
d4383f04 JDB |
246 | IP_VS_DBG_ADDR(svc->af, &iph->saddr), ntohs(src_port), |
247 | IP_VS_DBG_ADDR(svc->af, &iph->daddr), ntohs(dst_port), | |
cd17f9ed | 248 | IP_VS_DBG_ADDR(svc->af, &snet)); |
1da177e4 LT |
249 | |
250 | /* | |
251 | * As far as we know, FTP is a very complicated network protocol, and | |
252 | * it uses control connection and data connections. For active FTP, | |
253 | * FTP server initialize data connection to the client, its source port | |
254 | * is often 20. For passive FTP, FTP server tells the clients the port | |
255 | * that it passively listens to, and the client issues the data | |
256 | * connection. In the tunneling or direct routing mode, the load | |
257 | * balancer is on the client-to-server half of connection, the port | |
258 | * number is unknown to the load balancer. So, a conn template like | |
259 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP | |
260 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> | |
261 | * is created for other persistent services. | |
262 | */ | |
5b57a98c | 263 | { |
d4383f04 JDB |
264 | int protocol = iph->protocol; |
265 | const union nf_inet_addr *vaddr = &iph->daddr; | |
f11017ec SH |
266 | __be16 vport = 0; |
267 | ||
ce144f24 | 268 | if (dst_port == svc->port) { |
5b57a98c SH |
269 | /* non-FTP template: |
270 | * <protocol, caddr, 0, vaddr, vport, daddr, dport> | |
271 | * FTP template: | |
272 | * <protocol, caddr, 0, vaddr, 0, daddr, 0> | |
1da177e4 LT |
273 | */ |
274 | if (svc->port != FTPPORT) | |
ce144f24 | 275 | vport = dst_port; |
1da177e4 | 276 | } else { |
5b57a98c SH |
277 | /* Note: persistent fwmark-based services and |
278 | * persistent port zero service are handled here. | |
279 | * fwmark template: | |
280 | * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> | |
281 | * port zero template: | |
282 | * <protocol,caddr,0,vaddr,0,daddr,0> | |
1da177e4 | 283 | */ |
28364a59 | 284 | if (svc->fwmark) { |
5b57a98c SH |
285 | protocol = IPPROTO_IP; |
286 | vaddr = &fwmark; | |
287 | } | |
1da177e4 | 288 | } |
a5959d53 HS |
289 | /* return *ignored = -1 so NF_DROP can be used */ |
290 | if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0, | |
291 | vaddr, vport, ¶m) < 0) { | |
292 | *ignored = -1; | |
293 | return NULL; | |
294 | } | |
1da177e4 LT |
295 | } |
296 | ||
5b57a98c | 297 | /* Check if a template already exists */ |
f11017ec | 298 | ct = ip_vs_ct_in_get(¶m); |
5b57a98c | 299 | if (!ct || !ip_vs_check_template(ct)) { |
ceec4c38 JA |
300 | struct ip_vs_scheduler *sched; |
301 | ||
a5959d53 HS |
302 | /* |
303 | * No template found or the dest of the connection | |
5b57a98c | 304 | * template is not available. |
a5959d53 | 305 | * return *ignored=0 i.e. ICMP and NF_DROP |
5b57a98c | 306 | */ |
ceec4c38 JA |
307 | sched = rcu_dereference(svc->scheduler); |
308 | dest = sched->schedule(svc, skb); | |
5b57a98c SH |
309 | if (!dest) { |
310 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
85999283 | 311 | kfree(param.pe_data); |
a5959d53 | 312 | *ignored = 0; |
5b57a98c SH |
313 | return NULL; |
314 | } | |
315 | ||
ce144f24 | 316 | if (dst_port == svc->port && svc->port != FTPPORT) |
5b57a98c SH |
317 | dport = dest->port; |
318 | ||
85999283 SH |
319 | /* Create a template |
320 | * This adds param.pe_data to the template, | |
321 | * and thus param.pe_data will be destroyed | |
322 | * when the template expires */ | |
f11017ec | 323 | ct = ip_vs_conn_new(¶m, &dest->addr, dport, |
0e051e68 | 324 | IP_VS_CONN_F_TEMPLATE, dest, skb->mark); |
85999283 SH |
325 | if (ct == NULL) { |
326 | kfree(param.pe_data); | |
a5959d53 | 327 | *ignored = -1; |
5b57a98c | 328 | return NULL; |
85999283 | 329 | } |
5b57a98c SH |
330 | |
331 | ct->timeout = svc->timeout; | |
85999283 | 332 | } else { |
5b57a98c SH |
333 | /* set destination with the found template */ |
334 | dest = ct->dest; | |
85999283 SH |
335 | kfree(param.pe_data); |
336 | } | |
5b57a98c | 337 | |
ce144f24 | 338 | dport = dst_port; |
5b57a98c SH |
339 | if (dport == svc->port && dest->port) |
340 | dport = dest->port; | |
341 | ||
26ec037f | 342 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
d4383f04 | 343 | && iph->protocol == IPPROTO_UDP) ? |
26ec037f NC |
344 | IP_VS_CONN_F_ONE_PACKET : 0; |
345 | ||
1da177e4 LT |
346 | /* |
347 | * Create a new connection according to the template | |
348 | */ | |
d4383f04 JDB |
349 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, &iph->saddr, |
350 | src_port, &iph->daddr, dst_port, ¶m); | |
ce144f24 | 351 | |
0e051e68 | 352 | cp = ip_vs_conn_new(¶m, &dest->addr, dport, flags, dest, skb->mark); |
1da177e4 LT |
353 | if (cp == NULL) { |
354 | ip_vs_conn_put(ct); | |
a5959d53 | 355 | *ignored = -1; |
1da177e4 LT |
356 | return NULL; |
357 | } | |
358 | ||
359 | /* | |
360 | * Add its control | |
361 | */ | |
362 | ip_vs_control_add(cp, ct); | |
363 | ip_vs_conn_put(ct); | |
364 | ||
365 | ip_vs_conn_stats(cp, svc); | |
366 | return cp; | |
367 | } | |
368 | ||
369 | ||
370 | /* | |
371 | * IPVS main scheduling function | |
372 | * It selects a server according to the virtual service, and | |
373 | * creates a connection entry. | |
374 | * Protocols supported: TCP, UDP | |
a5959d53 HS |
375 | * |
376 | * Usage of *ignored | |
377 | * | |
378 | * 1 : protocol tried to schedule (eg. on SYN), found svc but the | |
379 | * svc/scheduler decides that this packet should be accepted with | |
380 | * NF_ACCEPT because it must not be scheduled. | |
381 | * | |
382 | * 0 : scheduler can not find destination, so try bypass or | |
383 | * return ICMP and then NF_DROP (ip_vs_leave). | |
384 | * | |
385 | * -1 : scheduler tried to schedule but fatal error occurred, eg. | |
386 | * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param | |
387 | * failure such as missing Call-ID, ENOMEM on skb_linearize | |
388 | * or pe_data. In this case we should return NF_DROP without | |
389 | * any attempts to send ICMP with ip_vs_leave. | |
1da177e4 LT |
390 | */ |
391 | struct ip_vs_conn * | |
190ecd27 | 392 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
d4383f04 JDB |
393 | struct ip_vs_proto_data *pd, int *ignored, |
394 | struct ip_vs_iphdr *iph) | |
1da177e4 | 395 | { |
9330419d | 396 | struct ip_vs_protocol *pp = pd->pp; |
1da177e4 | 397 | struct ip_vs_conn *cp = NULL; |
ceec4c38 | 398 | struct ip_vs_scheduler *sched; |
1da177e4 | 399 | struct ip_vs_dest *dest; |
3575792e JA |
400 | __be16 _ports[2], *pptr; |
401 | unsigned int flags; | |
1da177e4 | 402 | |
190ecd27 | 403 | *ignored = 1; |
2f74713d JDB |
404 | /* |
405 | * IPv6 frags, only the first hit here. | |
406 | */ | |
d4383f04 | 407 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
1da177e4 LT |
408 | if (pptr == NULL) |
409 | return NULL; | |
410 | ||
190ecd27 JA |
411 | /* |
412 | * FTPDATA needs this check when using local real server. | |
413 | * Never schedule Active FTPDATA connections from real server. | |
414 | * For LVS-NAT they must be already created. For other methods | |
415 | * with persistence the connection is created on SYN+ACK. | |
416 | */ | |
417 | if (pptr[0] == FTPDATA) { | |
0d79641a JA |
418 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
419 | "Not scheduling FTPDATA"); | |
190ecd27 JA |
420 | return NULL; |
421 | } | |
422 | ||
423 | /* | |
a5959d53 | 424 | * Do not schedule replies from local real server. |
190ecd27 JA |
425 | */ |
426 | if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) && | |
d4383f04 | 427 | (cp = pp->conn_in_get(svc->af, skb, iph, 1))) { |
0d79641a | 428 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
190ecd27 JA |
429 | "Not scheduling reply for existing connection"); |
430 | __ip_vs_conn_put(cp); | |
431 | return NULL; | |
432 | } | |
433 | ||
1da177e4 LT |
434 | /* |
435 | * Persistent service | |
436 | */ | |
a5959d53 | 437 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) |
d4383f04 JDB |
438 | return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored, |
439 | iph); | |
a5959d53 HS |
440 | |
441 | *ignored = 0; | |
1da177e4 LT |
442 | |
443 | /* | |
444 | * Non-persistent service | |
445 | */ | |
446 | if (!svc->fwmark && pptr[1] != svc->port) { | |
447 | if (!svc->port) | |
1e3e238e HE |
448 | pr_err("Schedule: port zero only supported " |
449 | "in persistent services, " | |
450 | "check your ipvs configuration\n"); | |
1da177e4 LT |
451 | return NULL; |
452 | } | |
453 | ||
ceec4c38 JA |
454 | sched = rcu_dereference(svc->scheduler); |
455 | dest = sched->schedule(svc, skb); | |
1da177e4 LT |
456 | if (dest == NULL) { |
457 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
458 | return NULL; | |
459 | } | |
460 | ||
26ec037f | 461 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
d4383f04 | 462 | && iph->protocol == IPPROTO_UDP) ? |
26ec037f NC |
463 | IP_VS_CONN_F_ONE_PACKET : 0; |
464 | ||
1da177e4 LT |
465 | /* |
466 | * Create a connection entry. | |
467 | */ | |
f11017ec SH |
468 | { |
469 | struct ip_vs_conn_param p; | |
6e67e586 | 470 | |
d4383f04 JDB |
471 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
472 | &iph->saddr, pptr[0], &iph->daddr, | |
473 | pptr[1], &p); | |
f11017ec SH |
474 | cp = ip_vs_conn_new(&p, &dest->addr, |
475 | dest->port ? dest->port : pptr[1], | |
0e051e68 | 476 | flags, dest, skb->mark); |
a5959d53 HS |
477 | if (!cp) { |
478 | *ignored = -1; | |
f11017ec | 479 | return NULL; |
a5959d53 | 480 | } |
f11017ec | 481 | } |
1da177e4 | 482 | |
cd17f9ed JV |
483 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
484 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", | |
485 | ip_vs_fwd_tag(cp), | |
486 | IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport), | |
487 | IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport), | |
488 | IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport), | |
489 | cp->flags, atomic_read(&cp->refcnt)); | |
1da177e4 LT |
490 | |
491 | ip_vs_conn_stats(cp, svc); | |
492 | return cp; | |
493 | } | |
494 | ||
495 | ||
496 | /* | |
497 | * Pass or drop the packet. | |
498 | * Called by ip_vs_in, when the virtual service is available but | |
499 | * no destination is available for a new connection. | |
500 | */ | |
501 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
d4383f04 | 502 | struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph) |
1da177e4 | 503 | { |
014d730d | 504 | __be16 _ports[2], *pptr; |
a7a86b86 SH |
505 | #ifdef CONFIG_SYSCTL |
506 | struct net *net; | |
507 | struct netns_ipvs *ipvs; | |
2a3b791e | 508 | int unicast; |
a7a86b86 | 509 | #endif |
9330419d | 510 | |
d4383f04 | 511 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
1da177e4 | 512 | if (pptr == NULL) { |
1da177e4 LT |
513 | return NF_DROP; |
514 | } | |
a7a86b86 SH |
515 | |
516 | #ifdef CONFIG_SYSCTL | |
4a98480b | 517 | net = skb_net(skb); |
1da177e4 | 518 | |
2a3b791e JV |
519 | #ifdef CONFIG_IP_VS_IPV6 |
520 | if (svc->af == AF_INET6) | |
d4383f04 | 521 | unicast = ipv6_addr_type(&iph->daddr.in6) & IPV6_ADDR_UNICAST; |
2a3b791e JV |
522 | else |
523 | #endif | |
d4383f04 | 524 | unicast = (inet_addr_type(net, iph->daddr.ip) == RTN_UNICAST); |
2a3b791e | 525 | |
1da177e4 | 526 | /* if it is fwmark-based service, the cache_bypass sysctl is up |
2a3b791e | 527 | and the destination is a non-local unicast, then create |
1da177e4 | 528 | a cache_bypass connection entry */ |
4a98480b | 529 | ipvs = net_ipvs(net); |
a0840e2e | 530 | if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) { |
ad542ced | 531 | int ret; |
1da177e4 | 532 | struct ip_vs_conn *cp; |
3575792e | 533 | unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && |
d4383f04 | 534 | iph->protocol == IPPROTO_UDP) ? |
3575792e | 535 | IP_VS_CONN_F_ONE_PACKET : 0; |
dff630dd | 536 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
1da177e4 | 537 | |
1da177e4 | 538 | /* create a new connection entry */ |
1e3e238e | 539 | IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); |
f11017ec SH |
540 | { |
541 | struct ip_vs_conn_param p; | |
d4383f04 JDB |
542 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
543 | &iph->saddr, pptr[0], | |
544 | &iph->daddr, pptr[1], &p); | |
f11017ec SH |
545 | cp = ip_vs_conn_new(&p, &daddr, 0, |
546 | IP_VS_CONN_F_BYPASS | flags, | |
0e051e68 | 547 | NULL, skb->mark); |
f11017ec SH |
548 | if (!cp) |
549 | return NF_DROP; | |
550 | } | |
1da177e4 LT |
551 | |
552 | /* statistics */ | |
553 | ip_vs_in_stats(cp, skb); | |
554 | ||
555 | /* set state */ | |
4a516f11 | 556 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 LT |
557 | |
558 | /* transmit the first SYN packet */ | |
d4383f04 | 559 | ret = cp->packet_xmit(skb, cp, pd->pp, iph); |
1da177e4 LT |
560 | /* do not touch skb anymore */ |
561 | ||
562 | atomic_inc(&cp->in_pkts); | |
563 | ip_vs_conn_put(cp); | |
564 | return ret; | |
565 | } | |
a7a86b86 | 566 | #endif |
1da177e4 LT |
567 | |
568 | /* | |
569 | * When the virtual ftp service is presented, packets destined | |
570 | * for other services on the VIP may get here (except services | |
571 | * listed in the ipvs table), pass the packets, because it is | |
572 | * not ipvs job to decide to drop the packets. | |
573 | */ | |
ceec4c38 | 574 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) |
1da177e4 | 575 | return NF_ACCEPT; |
1da177e4 LT |
576 | |
577 | /* | |
578 | * Notify the client that the destination is unreachable, and | |
579 | * release the socket buffer. | |
580 | * Since it is in IP layer, the TCP socket is not actually | |
581 | * created, the TCP RST packet cannot be sent, instead that | |
582 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
583 | */ | |
2a3b791e | 584 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f JA |
585 | if (svc->af == AF_INET6) { |
586 | if (!skb->dev) { | |
9fd0fa7a | 587 | struct net *net_ = dev_net(skb_dst(skb)->dev); |
cb59155f | 588 | |
9fd0fa7a | 589 | skb->dev = net_->loopback_dev; |
cb59155f | 590 | } |
3ffe533c | 591 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
cb59155f | 592 | } else |
2a3b791e JV |
593 | #endif |
594 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
595 | ||
1da177e4 LT |
596 | return NF_DROP; |
597 | } | |
598 | ||
84b3cee3 SH |
599 | #ifdef CONFIG_SYSCTL |
600 | ||
601 | static int sysctl_snat_reroute(struct sk_buff *skb) | |
602 | { | |
603 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); | |
604 | return ipvs->sysctl_snat_reroute; | |
605 | } | |
606 | ||
0cfa558e SH |
607 | static int sysctl_nat_icmp_send(struct net *net) |
608 | { | |
609 | struct netns_ipvs *ipvs = net_ipvs(net); | |
610 | return ipvs->sysctl_nat_icmp_send; | |
611 | } | |
612 | ||
71a8ab6c SH |
613 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) |
614 | { | |
615 | return ipvs->sysctl_expire_nodest_conn; | |
616 | } | |
617 | ||
84b3cee3 SH |
618 | #else |
619 | ||
620 | static int sysctl_snat_reroute(struct sk_buff *skb) { return 0; } | |
0cfa558e | 621 | static int sysctl_nat_icmp_send(struct net *net) { return 0; } |
71a8ab6c | 622 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; } |
84b3cee3 SH |
623 | |
624 | #endif | |
625 | ||
b1550f22 | 626 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
1da177e4 | 627 | { |
d3bc23e7 | 628 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
1da177e4 LT |
629 | } |
630 | ||
1ca5bb54 JA |
631 | static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum) |
632 | { | |
633 | if (NF_INET_LOCAL_IN == hooknum) | |
634 | return IP_DEFRAG_VS_IN; | |
635 | if (NF_INET_FORWARD == hooknum) | |
636 | return IP_DEFRAG_VS_FWD; | |
637 | return IP_DEFRAG_VS_OUT; | |
638 | } | |
639 | ||
776c729e | 640 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
1da177e4 | 641 | { |
ac69269a | 642 | int err; |
776c729e | 643 | |
ac69269a JA |
644 | local_bh_disable(); |
645 | err = ip_defrag(skb, user); | |
646 | local_bh_enable(); | |
776c729e | 647 | if (!err) |
eddc9ec5 | 648 | ip_send_check(ip_hdr(skb)); |
776c729e HX |
649 | |
650 | return err; | |
1da177e4 LT |
651 | } |
652 | ||
ba4fd7e9 SH |
653 | static int ip_vs_route_me_harder(int af, struct sk_buff *skb) |
654 | { | |
ba4fd7e9 SH |
655 | #ifdef CONFIG_IP_VS_IPV6 |
656 | if (af == AF_INET6) { | |
84b3cee3 | 657 | if (sysctl_snat_reroute(skb) && ip6_route_me_harder(skb) != 0) |
ba4fd7e9 SH |
658 | return 1; |
659 | } else | |
660 | #endif | |
84b3cee3 | 661 | if ((sysctl_snat_reroute(skb) || |
ba4fd7e9 SH |
662 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) && |
663 | ip_route_me_harder(skb, RTN_LOCAL) != 0) | |
664 | return 1; | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
1da177e4 LT |
669 | /* |
670 | * Packet has been made sufficiently writable in caller | |
671 | * - inout: 1=in->out, 0=out->in | |
672 | */ | |
673 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
674 | struct ip_vs_conn *cp, int inout) | |
675 | { | |
eddc9ec5 | 676 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 677 | unsigned int icmp_offset = iph->ihl*4; |
d56f90a7 ACM |
678 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
679 | icmp_offset); | |
1da177e4 LT |
680 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
681 | ||
682 | if (inout) { | |
e7ade46a | 683 | iph->saddr = cp->vaddr.ip; |
1da177e4 | 684 | ip_send_check(iph); |
e7ade46a | 685 | ciph->daddr = cp->vaddr.ip; |
1da177e4 LT |
686 | ip_send_check(ciph); |
687 | } else { | |
e7ade46a | 688 | iph->daddr = cp->daddr.ip; |
1da177e4 | 689 | ip_send_check(iph); |
e7ade46a | 690 | ciph->saddr = cp->daddr.ip; |
1da177e4 LT |
691 | ip_send_check(ciph); |
692 | } | |
693 | ||
2906f66a VMR |
694 | /* the TCP/UDP/SCTP port */ |
695 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || | |
696 | IPPROTO_SCTP == ciph->protocol) { | |
014d730d | 697 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
1da177e4 LT |
698 | |
699 | if (inout) | |
700 | ports[1] = cp->vport; | |
701 | else | |
702 | ports[0] = cp->dport; | |
703 | } | |
704 | ||
705 | /* And finally the ICMP checksum */ | |
706 | icmph->checksum = 0; | |
707 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
708 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
709 | ||
710 | if (inout) | |
0d79641a | 711 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
712 | "Forwarding altered outgoing ICMP"); |
713 | else | |
0d79641a | 714 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
715 | "Forwarding altered incoming ICMP"); |
716 | } | |
717 | ||
b3cdd2a7 JV |
718 | #ifdef CONFIG_IP_VS_IPV6 |
719 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
720 | struct ip_vs_conn *cp, int inout) | |
721 | { | |
722 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
63dca2c0 JDB |
723 | unsigned int icmp_offset = 0; |
724 | unsigned int offs = 0; /* header offset*/ | |
725 | int protocol; | |
726 | struct icmp6hdr *icmph; | |
727 | struct ipv6hdr *ciph; | |
728 | unsigned short fragoffs; | |
729 | ||
730 | ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL); | |
731 | icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset); | |
732 | offs = icmp_offset + sizeof(struct icmp6hdr); | |
733 | ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs); | |
734 | ||
735 | protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL); | |
b3cdd2a7 JV |
736 | |
737 | if (inout) { | |
738 | iph->saddr = cp->vaddr.in6; | |
739 | ciph->daddr = cp->vaddr.in6; | |
740 | } else { | |
741 | iph->daddr = cp->daddr.in6; | |
742 | ciph->saddr = cp->daddr.in6; | |
743 | } | |
744 | ||
2906f66a | 745 | /* the TCP/UDP/SCTP port */ |
63dca2c0 JDB |
746 | if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
747 | IPPROTO_SCTP == protocol)) { | |
748 | __be16 *ports = (void *)(skb_network_header(skb) + offs); | |
b3cdd2a7 | 749 | |
63dca2c0 JDB |
750 | IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__, |
751 | ntohs(inout ? ports[1] : ports[0]), | |
752 | ntohs(inout ? cp->vport : cp->dport)); | |
b3cdd2a7 JV |
753 | if (inout) |
754 | ports[1] = cp->vport; | |
755 | else | |
756 | ports[0] = cp->dport; | |
757 | } | |
758 | ||
759 | /* And finally the ICMP checksum */ | |
8870f842 SH |
760 | icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, |
761 | skb->len - icmp_offset, | |
762 | IPPROTO_ICMPV6, 0); | |
763 | skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset; | |
764 | skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); | |
765 | skb->ip_summed = CHECKSUM_PARTIAL; | |
b3cdd2a7 JV |
766 | |
767 | if (inout) | |
0d79641a JA |
768 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
769 | (void *)ciph - (void *)iph, | |
770 | "Forwarding altered outgoing ICMPv6"); | |
b3cdd2a7 | 771 | else |
0d79641a JA |
772 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
773 | (void *)ciph - (void *)iph, | |
774 | "Forwarding altered incoming ICMPv6"); | |
b3cdd2a7 JV |
775 | } |
776 | #endif | |
777 | ||
4856c84c | 778 | /* Handle relevant response ICMP messages - forward to the right |
6cb90db5 | 779 | * destination host. |
4856c84c | 780 | */ |
f2428ed5 SH |
781 | static int handle_response_icmp(int af, struct sk_buff *skb, |
782 | union nf_inet_addr *snet, | |
783 | __u8 protocol, struct ip_vs_conn *cp, | |
4856c84c MT |
784 | struct ip_vs_protocol *pp, |
785 | unsigned int offset, unsigned int ihl) | |
786 | { | |
787 | unsigned int verdict = NF_DROP; | |
788 | ||
789 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
1e3e238e HE |
790 | pr_err("shouldn't reach here, because the box is on the " |
791 | "half connection in the tun/dr module.\n"); | |
4856c84c MT |
792 | } |
793 | ||
794 | /* Ensure the checksum is correct */ | |
795 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
796 | /* Failed checksum! */ | |
f2428ed5 SH |
797 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
798 | IP_VS_DBG_ADDR(af, snet)); | |
4856c84c MT |
799 | goto out; |
800 | } | |
801 | ||
2906f66a VMR |
802 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
803 | IPPROTO_SCTP == protocol) | |
4856c84c MT |
804 | offset += 2 * sizeof(__u16); |
805 | if (!skb_make_writable(skb, offset)) | |
806 | goto out; | |
807 | ||
f2428ed5 SH |
808 | #ifdef CONFIG_IP_VS_IPV6 |
809 | if (af == AF_INET6) | |
810 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); | |
811 | else | |
812 | #endif | |
813 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
4856c84c | 814 | |
ba4fd7e9 SH |
815 | if (ip_vs_route_me_harder(af, skb)) |
816 | goto out; | |
f5a41847 | 817 | |
4856c84c MT |
818 | /* do the statistics and put it back */ |
819 | ip_vs_out_stats(cp, skb); | |
820 | ||
cf356d69 | 821 | skb->ipvs_property = 1; |
f4bc17cd | 822 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 823 | ip_vs_notrack(skb); |
f4bc17cd JA |
824 | else |
825 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
826 | verdict = NF_ACCEPT; |
827 | ||
828 | out: | |
829 | __ip_vs_conn_put(cp); | |
830 | ||
831 | return verdict; | |
832 | } | |
833 | ||
1da177e4 LT |
834 | /* |
835 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
4856c84c | 836 | * Find any that might be relevant, check against existing connections. |
1da177e4 | 837 | * Currently handles error types - unreachable, quench, ttl exceeded. |
1da177e4 | 838 | */ |
1ca5bb54 JA |
839 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related, |
840 | unsigned int hooknum) | |
1da177e4 | 841 | { |
1da177e4 LT |
842 | struct iphdr *iph; |
843 | struct icmphdr _icmph, *ic; | |
844 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 845 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
846 | struct ip_vs_conn *cp; |
847 | struct ip_vs_protocol *pp; | |
4856c84c | 848 | unsigned int offset, ihl; |
f2428ed5 | 849 | union nf_inet_addr snet; |
1da177e4 LT |
850 | |
851 | *related = 1; | |
852 | ||
853 | /* reassemble IP fragments */ | |
56f8a75c | 854 | if (ip_is_fragment(ip_hdr(skb))) { |
1ca5bb54 | 855 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 856 | return NF_STOLEN; |
1da177e4 LT |
857 | } |
858 | ||
eddc9ec5 | 859 | iph = ip_hdr(skb); |
1da177e4 LT |
860 | offset = ihl = iph->ihl * 4; |
861 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
862 | if (ic == NULL) | |
863 | return NF_DROP; | |
864 | ||
14d5e834 | 865 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 866 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 867 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
868 | |
869 | /* | |
870 | * Work through seeing if this is for us. | |
871 | * These checks are supposed to be in an order that means easy | |
872 | * things are checked first to speed up processing.... however | |
873 | * this means that some packets will manage to get a long way | |
874 | * down this stack and then be rejected, but that's life. | |
875 | */ | |
876 | if ((ic->type != ICMP_DEST_UNREACH) && | |
877 | (ic->type != ICMP_SOURCE_QUENCH) && | |
878 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
879 | *related = 0; | |
880 | return NF_ACCEPT; | |
881 | } | |
882 | ||
883 | /* Now find the contained IP header */ | |
884 | offset += sizeof(_icmph); | |
885 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
886 | if (cih == NULL) | |
887 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
888 | ||
889 | pp = ip_vs_proto_get(cih->protocol); | |
890 | if (!pp) | |
891 | return NF_ACCEPT; | |
892 | ||
893 | /* Is the embedded protocol header present? */ | |
4412ec49 | 894 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
895 | pp->dont_defrag)) |
896 | return NF_ACCEPT; | |
897 | ||
0d79641a JA |
898 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
899 | "Checking outgoing ICMP for"); | |
1da177e4 | 900 | |
63dca2c0 JDB |
901 | ip_vs_fill_ip4hdr(cih, &ciph); |
902 | ciph.len += offset; | |
1da177e4 | 903 | /* The embedded headers contain source and dest in reverse order */ |
d4383f04 | 904 | cp = pp->conn_out_get(AF_INET, skb, &ciph, 1); |
1da177e4 LT |
905 | if (!cp) |
906 | return NF_ACCEPT; | |
907 | ||
f2428ed5 SH |
908 | snet.ip = iph->saddr; |
909 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, | |
63dca2c0 | 910 | pp, ciph.len, ihl); |
1da177e4 LT |
911 | } |
912 | ||
2a3b791e | 913 | #ifdef CONFIG_IP_VS_IPV6 |
1ca5bb54 | 914 | static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, |
d4383f04 | 915 | unsigned int hooknum, struct ip_vs_iphdr *ipvsh) |
2a3b791e | 916 | { |
2a3b791e | 917 | struct icmp6hdr _icmph, *ic; |
63dca2c0 JDB |
918 | struct ipv6hdr _ip6h, *ip6h; /* The ip header contained within ICMP */ |
919 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ | |
2a3b791e JV |
920 | struct ip_vs_conn *cp; |
921 | struct ip_vs_protocol *pp; | |
f2428ed5 | 922 | union nf_inet_addr snet; |
63dca2c0 | 923 | unsigned int writable; |
2a3b791e | 924 | |
63dca2c0 | 925 | *related = 1; |
2f74713d | 926 | ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh); |
2a3b791e JV |
927 | if (ic == NULL) |
928 | return NF_DROP; | |
929 | ||
2a3b791e JV |
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 | */ | |
2fab8917 | 937 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
2a3b791e JV |
938 | *related = 0; |
939 | return NF_ACCEPT; | |
940 | } | |
2f74713d JDB |
941 | /* Fragment header that is before ICMP header tells us that: |
942 | * it's not an error message since they can't be fragmented. | |
943 | */ | |
e7165030 | 944 | if (ipvsh->flags & IP6_FH_F_FRAG) |
2f74713d | 945 | return NF_DROP; |
2a3b791e | 946 | |
63dca2c0 JDB |
947 | IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
948 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
949 | &ipvsh->saddr, &ipvsh->daddr); | |
950 | ||
2a3b791e | 951 | /* Now find the contained IP header */ |
63dca2c0 JDB |
952 | ciph.len = ipvsh->len + sizeof(_icmph); |
953 | ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); | |
954 | if (ip6h == NULL) | |
2a3b791e | 955 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
63dca2c0 JDB |
956 | ciph.saddr.in6 = ip6h->saddr; /* conn_out_get() handles reverse order */ |
957 | ciph.daddr.in6 = ip6h->daddr; | |
958 | /* skip possible IPv6 exthdrs of contained IPv6 packet */ | |
959 | ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); | |
960 | if (ciph.protocol < 0) | |
961 | return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ | |
962 | ||
963 | pp = ip_vs_proto_get(ciph.protocol); | |
2a3b791e JV |
964 | if (!pp) |
965 | return NF_ACCEPT; | |
966 | ||
2a3b791e | 967 | /* The embedded headers contain source and dest in reverse order */ |
d4383f04 | 968 | cp = pp->conn_out_get(AF_INET6, skb, &ciph, 1); |
2a3b791e JV |
969 | if (!cp) |
970 | return NF_ACCEPT; | |
971 | ||
63dca2c0 JDB |
972 | snet.in6 = ciph.saddr.in6; |
973 | writable = ciph.len; | |
974 | return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp, | |
975 | pp, writable, sizeof(struct ipv6hdr)); | |
2a3b791e JV |
976 | } |
977 | #endif | |
978 | ||
2906f66a VMR |
979 | /* |
980 | * Check if sctp chunc is ABORT chunk | |
981 | */ | |
982 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) | |
983 | { | |
984 | sctp_chunkhdr_t *sch, schunk; | |
985 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), | |
986 | sizeof(schunk), &schunk); | |
987 | if (sch == NULL) | |
988 | return 0; | |
989 | if (sch->type == SCTP_CID_ABORT) | |
990 | return 1; | |
991 | return 0; | |
992 | } | |
993 | ||
2a3b791e | 994 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
1da177e4 LT |
995 | { |
996 | struct tcphdr _tcph, *th; | |
997 | ||
2a3b791e | 998 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
1da177e4 LT |
999 | if (th == NULL) |
1000 | return 0; | |
1001 | return th->rst; | |
1002 | } | |
1003 | ||
4856c84c | 1004 | /* Handle response packets: rewrite addresses and send away... |
4856c84c MT |
1005 | */ |
1006 | static unsigned int | |
9330419d | 1007 | handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, |
d4383f04 | 1008 | struct ip_vs_conn *cp, struct ip_vs_iphdr *iph) |
4856c84c | 1009 | { |
9330419d HS |
1010 | struct ip_vs_protocol *pp = pd->pp; |
1011 | ||
0d79641a | 1012 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet"); |
4856c84c | 1013 | |
d4383f04 | 1014 | if (!skb_make_writable(skb, iph->len)) |
4856c84c MT |
1015 | goto drop; |
1016 | ||
1017 | /* mangle the packet */ | |
d4383f04 | 1018 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph)) |
4856c84c MT |
1019 | goto drop; |
1020 | ||
1021 | #ifdef CONFIG_IP_VS_IPV6 | |
1022 | if (af == AF_INET6) | |
1023 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; | |
1024 | else | |
1025 | #endif | |
1026 | { | |
1027 | ip_hdr(skb)->saddr = cp->vaddr.ip; | |
1028 | ip_send_check(ip_hdr(skb)); | |
1029 | } | |
1030 | ||
8a803040 JA |
1031 | /* |
1032 | * nf_iterate does not expect change in the skb->dst->dev. | |
1033 | * It looks like it is not fatal to enable this code for hooks | |
1034 | * where our handlers are at the end of the chain list and | |
1035 | * when all next handlers use skb->dst->dev and not outdev. | |
1036 | * It will definitely route properly the inout NAT traffic | |
1037 | * when multiple paths are used. | |
1038 | */ | |
1039 | ||
4856c84c MT |
1040 | /* For policy routing, packets originating from this |
1041 | * machine itself may be routed differently to packets | |
1042 | * passing through. We want this packet to be routed as | |
1043 | * if it came from this machine itself. So re-compute | |
1044 | * the routing information. | |
1045 | */ | |
ba4fd7e9 SH |
1046 | if (ip_vs_route_me_harder(af, skb)) |
1047 | goto drop; | |
4856c84c | 1048 | |
0d79641a | 1049 | IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT"); |
4856c84c MT |
1050 | |
1051 | ip_vs_out_stats(cp, skb); | |
9330419d | 1052 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); |
cf356d69 | 1053 | skb->ipvs_property = 1; |
f4bc17cd | 1054 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 1055 | ip_vs_notrack(skb); |
f4bc17cd JA |
1056 | else |
1057 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
1058 | ip_vs_conn_put(cp); |
1059 | ||
4856c84c MT |
1060 | LeaveFunction(11); |
1061 | return NF_ACCEPT; | |
1062 | ||
1063 | drop: | |
1064 | ip_vs_conn_put(cp); | |
1065 | kfree_skb(skb); | |
f4bc17cd | 1066 | LeaveFunction(11); |
4856c84c MT |
1067 | return NF_STOLEN; |
1068 | } | |
1069 | ||
1da177e4 | 1070 | /* |
4856c84c | 1071 | * Check if outgoing packet belongs to the established ip_vs_conn. |
1da177e4 LT |
1072 | */ |
1073 | static unsigned int | |
fc604767 | 1074 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1075 | { |
fc723250 | 1076 | struct net *net = NULL; |
51ef348b | 1077 | struct ip_vs_iphdr iph; |
1da177e4 | 1078 | struct ip_vs_protocol *pp; |
9330419d | 1079 | struct ip_vs_proto_data *pd; |
1da177e4 | 1080 | struct ip_vs_conn *cp; |
1da177e4 LT |
1081 | |
1082 | EnterFunction(11); | |
1083 | ||
fc604767 | 1084 | /* Already marked as IPVS request or reply? */ |
6869c4d8 | 1085 | if (skb->ipvs_property) |
1da177e4 LT |
1086 | return NF_ACCEPT; |
1087 | ||
fc604767 JA |
1088 | /* Bad... Do not break raw sockets */ |
1089 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1090 | af == AF_INET)) { | |
1091 | struct sock *sk = skb->sk; | |
1092 | struct inet_sock *inet = inet_sk(skb->sk); | |
1093 | ||
1094 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1095 | return NF_ACCEPT; | |
1096 | } | |
1097 | ||
1098 | if (unlikely(!skb_dst(skb))) | |
1099 | return NF_ACCEPT; | |
1100 | ||
fc723250 | 1101 | net = skb_net(skb); |
7a4f0761 HS |
1102 | if (!net_ipvs(net)->enable) |
1103 | return NF_ACCEPT; | |
1104 | ||
63dca2c0 | 1105 | ip_vs_fill_iph_skb(af, skb, &iph); |
2a3b791e JV |
1106 | #ifdef CONFIG_IP_VS_IPV6 |
1107 | if (af == AF_INET6) { | |
2f74713d JDB |
1108 | if (!iph.fragoffs && skb_nfct_reasm(skb)) { |
1109 | struct sk_buff *reasm = skb_nfct_reasm(skb); | |
1110 | /* Save fw mark for coming frags */ | |
1111 | reasm->ipvs_property = 1; | |
1112 | reasm->mark = skb->mark; | |
1113 | } | |
2a3b791e | 1114 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { |
1ca5bb54 JA |
1115 | int related; |
1116 | int verdict = ip_vs_out_icmp_v6(skb, &related, | |
d4383f04 | 1117 | hooknum, &iph); |
1da177e4 | 1118 | |
f5a41847 | 1119 | if (related) |
2a3b791e | 1120 | return verdict; |
2a3b791e JV |
1121 | } |
1122 | } else | |
1123 | #endif | |
1124 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 JA |
1125 | int related; |
1126 | int verdict = ip_vs_out_icmp(skb, &related, hooknum); | |
2a3b791e | 1127 | |
f5a41847 | 1128 | if (related) |
2a3b791e | 1129 | return verdict; |
2a3b791e | 1130 | } |
1da177e4 | 1131 | |
9330419d HS |
1132 | pd = ip_vs_proto_data_get(net, iph.protocol); |
1133 | if (unlikely(!pd)) | |
1da177e4 | 1134 | return NF_ACCEPT; |
9330419d | 1135 | pp = pd->pp; |
1da177e4 LT |
1136 | |
1137 | /* reassemble IP fragments */ | |
2a3b791e | 1138 | #ifdef CONFIG_IP_VS_IPV6 |
63dca2c0 | 1139 | if (af == AF_INET) |
2a3b791e | 1140 | #endif |
56f8a75c | 1141 | if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) { |
1ca5bb54 JA |
1142 | if (ip_vs_gather_frags(skb, |
1143 | ip_vs_defrag_user(hooknum))) | |
2a3b791e JV |
1144 | return NF_STOLEN; |
1145 | ||
63dca2c0 | 1146 | ip_vs_fill_ip4hdr(skb_network_header(skb), &iph); |
2a3b791e | 1147 | } |
1da177e4 LT |
1148 | |
1149 | /* | |
1150 | * Check if the packet belongs to an existing entry | |
1151 | */ | |
d4383f04 | 1152 | cp = pp->conn_out_get(af, skb, &iph, 0); |
1da177e4 | 1153 | |
cb59155f | 1154 | if (likely(cp)) |
d4383f04 | 1155 | return handle_response(af, skb, pd, cp, &iph); |
0cfa558e | 1156 | if (sysctl_nat_icmp_send(net) && |
cb59155f JA |
1157 | (pp->protocol == IPPROTO_TCP || |
1158 | pp->protocol == IPPROTO_UDP || | |
1159 | pp->protocol == IPPROTO_SCTP)) { | |
1160 | __be16 _ports[2], *pptr; | |
1161 | ||
2f74713d JDB |
1162 | pptr = frag_safe_skb_hp(skb, iph.len, |
1163 | sizeof(_ports), _ports, &iph); | |
cb59155f JA |
1164 | if (pptr == NULL) |
1165 | return NF_ACCEPT; /* Not for me */ | |
276472ea JA |
1166 | if (ip_vs_has_real_service(net, af, iph.protocol, &iph.saddr, |
1167 | pptr[0])) { | |
cb59155f JA |
1168 | /* |
1169 | * Notify the real server: there is no | |
1170 | * existing entry if it is not RST | |
1171 | * packet or not TCP packet. | |
1172 | */ | |
1173 | if ((iph.protocol != IPPROTO_TCP && | |
1174 | iph.protocol != IPPROTO_SCTP) | |
1175 | || ((iph.protocol == IPPROTO_TCP | |
1176 | && !is_tcp_reset(skb, iph.len)) | |
1177 | || (iph.protocol == IPPROTO_SCTP | |
1178 | && !is_sctp_abort(skb, | |
1179 | iph.len)))) { | |
2a3b791e | 1180 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f | 1181 | if (af == AF_INET6) { |
cb59155f JA |
1182 | if (!skb->dev) |
1183 | skb->dev = net->loopback_dev; | |
1184 | icmpv6_send(skb, | |
1185 | ICMPV6_DEST_UNREACH, | |
1186 | ICMPV6_PORT_UNREACH, | |
1187 | 0); | |
1188 | } else | |
2a3b791e | 1189 | #endif |
cb59155f JA |
1190 | icmp_send(skb, |
1191 | ICMP_DEST_UNREACH, | |
1192 | ICMP_PORT_UNREACH, 0); | |
1193 | return NF_DROP; | |
1da177e4 LT |
1194 | } |
1195 | } | |
1da177e4 | 1196 | } |
0d79641a | 1197 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
cb59155f JA |
1198 | "ip_vs_out: packet continues traversal as normal"); |
1199 | return NF_ACCEPT; | |
1da177e4 LT |
1200 | } |
1201 | ||
fc604767 | 1202 | /* |
cb59155f JA |
1203 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1204 | * used only for VS/NAT. | |
fc604767 JA |
1205 | * Check if packet is reply for established ip_vs_conn. |
1206 | */ | |
1207 | static unsigned int | |
1208 | ip_vs_reply4(unsigned int hooknum, struct sk_buff *skb, | |
1209 | const struct net_device *in, const struct net_device *out, | |
1210 | int (*okfn)(struct sk_buff *)) | |
1211 | { | |
1212 | return ip_vs_out(hooknum, skb, AF_INET); | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1217 | * Check if packet is reply for established ip_vs_conn. | |
1218 | */ | |
1219 | static unsigned int | |
1220 | ip_vs_local_reply4(unsigned int hooknum, struct sk_buff *skb, | |
1221 | const struct net_device *in, const struct net_device *out, | |
1222 | int (*okfn)(struct sk_buff *)) | |
1223 | { | |
ac69269a | 1224 | return ip_vs_out(hooknum, skb, AF_INET); |
fc604767 JA |
1225 | } |
1226 | ||
1227 | #ifdef CONFIG_IP_VS_IPV6 | |
1228 | ||
1229 | /* | |
cb59155f JA |
1230 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1231 | * used only for VS/NAT. | |
fc604767 JA |
1232 | * Check if packet is reply for established ip_vs_conn. |
1233 | */ | |
1234 | static unsigned int | |
1235 | ip_vs_reply6(unsigned int hooknum, struct sk_buff *skb, | |
1236 | const struct net_device *in, const struct net_device *out, | |
1237 | int (*okfn)(struct sk_buff *)) | |
1238 | { | |
1239 | return ip_vs_out(hooknum, skb, AF_INET6); | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1244 | * Check if packet is reply for established ip_vs_conn. | |
1245 | */ | |
1246 | static unsigned int | |
1247 | ip_vs_local_reply6(unsigned int hooknum, struct sk_buff *skb, | |
1248 | const struct net_device *in, const struct net_device *out, | |
1249 | int (*okfn)(struct sk_buff *)) | |
1250 | { | |
ac69269a | 1251 | return ip_vs_out(hooknum, skb, AF_INET6); |
fc604767 JA |
1252 | } |
1253 | ||
1254 | #endif | |
1da177e4 LT |
1255 | |
1256 | /* | |
1257 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
1258 | * Find any that might be relevant, check against existing connections, | |
1259 | * forward to the right destination host if relevant. | |
1260 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
1261 | */ | |
e905a9ed | 1262 | static int |
3db05fea | 1263 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
1da177e4 | 1264 | { |
9330419d | 1265 | struct net *net = NULL; |
1da177e4 LT |
1266 | struct iphdr *iph; |
1267 | struct icmphdr _icmph, *ic; | |
1268 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 1269 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
1270 | struct ip_vs_conn *cp; |
1271 | struct ip_vs_protocol *pp; | |
9330419d | 1272 | struct ip_vs_proto_data *pd; |
f2edb9f7 JA |
1273 | unsigned int offset, offset2, ihl, verdict; |
1274 | bool ipip; | |
1da177e4 LT |
1275 | |
1276 | *related = 1; | |
1277 | ||
1278 | /* reassemble IP fragments */ | |
56f8a75c | 1279 | if (ip_is_fragment(ip_hdr(skb))) { |
1ca5bb54 | 1280 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 1281 | return NF_STOLEN; |
1da177e4 LT |
1282 | } |
1283 | ||
eddc9ec5 | 1284 | iph = ip_hdr(skb); |
1da177e4 LT |
1285 | offset = ihl = iph->ihl * 4; |
1286 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1287 | if (ic == NULL) | |
1288 | return NF_DROP; | |
1289 | ||
14d5e834 | 1290 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 1291 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 1292 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
1293 | |
1294 | /* | |
1295 | * Work through seeing if this is for us. | |
1296 | * These checks are supposed to be in an order that means easy | |
1297 | * things are checked first to speed up processing.... however | |
1298 | * this means that some packets will manage to get a long way | |
1299 | * down this stack and then be rejected, but that's life. | |
1300 | */ | |
1301 | if ((ic->type != ICMP_DEST_UNREACH) && | |
1302 | (ic->type != ICMP_SOURCE_QUENCH) && | |
1303 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
1304 | *related = 0; | |
1305 | return NF_ACCEPT; | |
1306 | } | |
1307 | ||
1308 | /* Now find the contained IP header */ | |
1309 | offset += sizeof(_icmph); | |
1310 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1311 | if (cih == NULL) | |
1312 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1313 | ||
9330419d | 1314 | net = skb_net(skb); |
7a4f0761 | 1315 | |
f2edb9f7 JA |
1316 | /* Special case for errors for IPIP packets */ |
1317 | ipip = false; | |
1318 | if (cih->protocol == IPPROTO_IPIP) { | |
1319 | if (unlikely(cih->frag_off & htons(IP_OFFSET))) | |
1320 | return NF_ACCEPT; | |
1321 | /* Error for our IPIP must arrive at LOCAL_IN */ | |
1322 | if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL)) | |
1323 | return NF_ACCEPT; | |
1324 | offset += cih->ihl * 4; | |
1325 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1326 | if (cih == NULL) | |
1327 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1328 | ipip = true; | |
1329 | } | |
1330 | ||
9330419d HS |
1331 | pd = ip_vs_proto_data_get(net, cih->protocol); |
1332 | if (!pd) | |
1da177e4 | 1333 | return NF_ACCEPT; |
9330419d | 1334 | pp = pd->pp; |
1da177e4 LT |
1335 | |
1336 | /* Is the embedded protocol header present? */ | |
4412ec49 | 1337 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
1338 | pp->dont_defrag)) |
1339 | return NF_ACCEPT; | |
1340 | ||
0d79641a JA |
1341 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
1342 | "Checking incoming ICMP for"); | |
1da177e4 | 1343 | |
f2edb9f7 | 1344 | offset2 = offset; |
63dca2c0 JDB |
1345 | ip_vs_fill_ip4hdr(cih, &ciph); |
1346 | ciph.len += offset; | |
1347 | offset = ciph.len; | |
f2edb9f7 JA |
1348 | /* The embedded headers contain source and dest in reverse order. |
1349 | * For IPIP this is error for request, not for reply. | |
1350 | */ | |
d4383f04 | 1351 | cp = pp->conn_in_get(AF_INET, skb, &ciph, ipip ? 0 : 1); |
6cb90db5 | 1352 | if (!cp) |
1da177e4 LT |
1353 | return NF_ACCEPT; |
1354 | ||
1355 | verdict = NF_DROP; | |
1356 | ||
1357 | /* Ensure the checksum is correct */ | |
60476372 | 1358 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 | 1359 | /* Failed checksum! */ |
14d5e834 HH |
1360 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
1361 | &iph->saddr); | |
1da177e4 LT |
1362 | goto out; |
1363 | } | |
1364 | ||
f2edb9f7 JA |
1365 | if (ipip) { |
1366 | __be32 info = ic->un.gateway; | |
1367 | ||
1368 | /* Update the MTU */ | |
1369 | if (ic->type == ICMP_DEST_UNREACH && | |
1370 | ic->code == ICMP_FRAG_NEEDED) { | |
1371 | struct ip_vs_dest *dest = cp->dest; | |
1372 | u32 mtu = ntohs(ic->un.frag.mtu); | |
1373 | ||
1374 | /* Strip outer IP and ICMP, go to IPIP header */ | |
1375 | __skb_pull(skb, ihl + sizeof(_icmph)); | |
1376 | offset2 -= ihl + sizeof(_icmph); | |
1377 | skb_reset_network_header(skb); | |
1378 | IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n", | |
1379 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu); | |
f2edb9f7 JA |
1380 | ipv4_update_pmtu(skb, dev_net(skb->dev), |
1381 | mtu, 0, 0, 0, 0); | |
f2edb9f7 JA |
1382 | /* Client uses PMTUD? */ |
1383 | if (!(cih->frag_off & htons(IP_DF))) | |
1384 | goto ignore_ipip; | |
1385 | /* Prefer the resulting PMTU */ | |
1386 | if (dest) { | |
026ace06 JA |
1387 | struct ip_vs_dest_dst *dest_dst; |
1388 | ||
1389 | rcu_read_lock(); | |
1390 | dest_dst = rcu_dereference(dest->dest_dst); | |
1391 | if (dest_dst) | |
1392 | mtu = dst_mtu(dest_dst->dst_cache); | |
1393 | rcu_read_unlock(); | |
f2edb9f7 JA |
1394 | } |
1395 | if (mtu > 68 + sizeof(struct iphdr)) | |
1396 | mtu -= sizeof(struct iphdr); | |
1397 | info = htonl(mtu); | |
1398 | } | |
1399 | /* Strip outer IP, ICMP and IPIP, go to IP header of | |
1400 | * original request. | |
1401 | */ | |
1402 | __skb_pull(skb, offset2); | |
1403 | skb_reset_network_header(skb); | |
1404 | IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n", | |
1405 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1406 | ic->type, ic->code, ntohl(info)); | |
1407 | icmp_send(skb, ic->type, ic->code, info); | |
1408 | /* ICMP can be shorter but anyways, account it */ | |
1409 | ip_vs_out_stats(cp, skb); | |
1410 | ||
1411 | ignore_ipip: | |
1412 | consume_skb(skb); | |
1413 | verdict = NF_STOLEN; | |
1414 | goto out; | |
1415 | } | |
1416 | ||
1da177e4 LT |
1417 | /* do the statistics and put it back */ |
1418 | ip_vs_in_stats(cp, skb); | |
1419 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) | |
1420 | offset += 2 * sizeof(__u16); | |
d4383f04 | 1421 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph); |
1da177e4 | 1422 | |
552ad65a | 1423 | out: |
1da177e4 LT |
1424 | __ip_vs_conn_put(cp); |
1425 | ||
1426 | return verdict; | |
1427 | } | |
1428 | ||
2a3b791e | 1429 | #ifdef CONFIG_IP_VS_IPV6 |
d4383f04 JDB |
1430 | static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, |
1431 | unsigned int hooknum, struct ip_vs_iphdr *iph) | |
2a3b791e | 1432 | { |
9330419d | 1433 | struct net *net = NULL; |
63dca2c0 | 1434 | struct ipv6hdr _ip6h, *ip6h; |
2a3b791e | 1435 | struct icmp6hdr _icmph, *ic; |
63dca2c0 | 1436 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
2a3b791e JV |
1437 | struct ip_vs_conn *cp; |
1438 | struct ip_vs_protocol *pp; | |
9330419d | 1439 | struct ip_vs_proto_data *pd; |
63dca2c0 | 1440 | unsigned int offs_ciph, writable, verdict; |
2a3b791e | 1441 | |
63dca2c0 | 1442 | *related = 1; |
2a3b791e | 1443 | |
2f74713d | 1444 | ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph, iph); |
2a3b791e JV |
1445 | if (ic == NULL) |
1446 | return NF_DROP; | |
1447 | ||
2a3b791e JV |
1448 | /* |
1449 | * Work through seeing if this is for us. | |
1450 | * These checks are supposed to be in an order that means easy | |
1451 | * things are checked first to speed up processing.... however | |
1452 | * this means that some packets will manage to get a long way | |
1453 | * down this stack and then be rejected, but that's life. | |
1454 | */ | |
2fab8917 | 1455 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
2a3b791e JV |
1456 | *related = 0; |
1457 | return NF_ACCEPT; | |
1458 | } | |
2f74713d JDB |
1459 | /* Fragment header that is before ICMP header tells us that: |
1460 | * it's not an error message since they can't be fragmented. | |
1461 | */ | |
e7165030 | 1462 | if (iph->flags & IP6_FH_F_FRAG) |
2f74713d | 1463 | return NF_DROP; |
2a3b791e | 1464 | |
63dca2c0 JDB |
1465 | IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
1466 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
1467 | &iph->saddr, &iph->daddr); | |
1468 | ||
2a3b791e | 1469 | /* Now find the contained IP header */ |
63dca2c0 JDB |
1470 | ciph.len = iph->len + sizeof(_icmph); |
1471 | offs_ciph = ciph.len; /* Save ip header offset */ | |
1472 | ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); | |
1473 | if (ip6h == NULL) | |
2a3b791e | 1474 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
63dca2c0 JDB |
1475 | ciph.saddr.in6 = ip6h->saddr; /* conn_in_get() handles reverse order */ |
1476 | ciph.daddr.in6 = ip6h->daddr; | |
1477 | /* skip possible IPv6 exthdrs of contained IPv6 packet */ | |
1478 | ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); | |
1479 | if (ciph.protocol < 0) | |
1480 | return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ | |
2a3b791e | 1481 | |
9330419d | 1482 | net = skb_net(skb); |
63dca2c0 | 1483 | pd = ip_vs_proto_data_get(net, ciph.protocol); |
9330419d | 1484 | if (!pd) |
2a3b791e | 1485 | return NF_ACCEPT; |
9330419d | 1486 | pp = pd->pp; |
2a3b791e | 1487 | |
63dca2c0 JDB |
1488 | /* Cannot handle fragmented embedded protocol */ |
1489 | if (ciph.fragoffs) | |
2a3b791e JV |
1490 | return NF_ACCEPT; |
1491 | ||
63dca2c0 | 1492 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offs_ciph, |
0d79641a | 1493 | "Checking incoming ICMPv6 for"); |
2a3b791e | 1494 | |
2f74713d JDB |
1495 | /* The embedded headers contain source and dest in reverse order |
1496 | * if not from localhost | |
1497 | */ | |
d4383f04 | 1498 | cp = pp->conn_in_get(AF_INET6, skb, &ciph, |
2f74713d JDB |
1499 | (hooknum == NF_INET_LOCAL_OUT) ? 0 : 1); |
1500 | ||
6cb90db5 | 1501 | if (!cp) |
2a3b791e | 1502 | return NF_ACCEPT; |
2f74713d JDB |
1503 | /* VS/TUN, VS/DR and LOCALNODE just let it go */ |
1504 | if ((hooknum == NF_INET_LOCAL_OUT) && | |
1505 | (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) { | |
1506 | __ip_vs_conn_put(cp); | |
1507 | return NF_ACCEPT; | |
1508 | } | |
2a3b791e | 1509 | |
2a3b791e JV |
1510 | /* do the statistics and put it back */ |
1511 | ip_vs_in_stats(cp, skb); | |
63dca2c0 JDB |
1512 | |
1513 | /* Need to mangle contained IPv6 header in ICMPv6 packet */ | |
1514 | writable = ciph.len; | |
1515 | if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol || | |
1516 | IPPROTO_SCTP == ciph.protocol) | |
1517 | writable += 2 * sizeof(__u16); /* Also mangle ports */ | |
1518 | ||
d4383f04 | 1519 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, writable, hooknum, &ciph); |
2a3b791e JV |
1520 | |
1521 | __ip_vs_conn_put(cp); | |
1522 | ||
1523 | return verdict; | |
1524 | } | |
1525 | #endif | |
1526 | ||
1527 | ||
1da177e4 LT |
1528 | /* |
1529 | * Check if it's for virtual services, look it up, | |
1530 | * and send it on its way... | |
1531 | */ | |
1532 | static unsigned int | |
cb59155f | 1533 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1534 | { |
f131315f | 1535 | struct net *net; |
51ef348b | 1536 | struct ip_vs_iphdr iph; |
1da177e4 | 1537 | struct ip_vs_protocol *pp; |
9330419d | 1538 | struct ip_vs_proto_data *pd; |
1da177e4 | 1539 | struct ip_vs_conn *cp; |
4a516f11 | 1540 | int ret, pkts; |
f131315f | 1541 | struct netns_ipvs *ipvs; |
2a3b791e | 1542 | |
fc604767 JA |
1543 | /* Already marked as IPVS request or reply? */ |
1544 | if (skb->ipvs_property) | |
1545 | return NF_ACCEPT; | |
1546 | ||
1da177e4 | 1547 | /* |
cb59155f JA |
1548 | * Big tappo: |
1549 | * - remote client: only PACKET_HOST | |
1550 | * - route: used for struct net when skb->dev is unset | |
1da177e4 | 1551 | */ |
cb59155f JA |
1552 | if (unlikely((skb->pkt_type != PACKET_HOST && |
1553 | hooknum != NF_INET_LOCAL_OUT) || | |
1554 | !skb_dst(skb))) { | |
63dca2c0 | 1555 | ip_vs_fill_iph_skb(af, skb, &iph); |
cb59155f JA |
1556 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s" |
1557 | " ignored in hook %u\n", | |
1558 | skb->pkt_type, iph.protocol, | |
1559 | IP_VS_DBG_ADDR(af, &iph.daddr), hooknum); | |
1da177e4 LT |
1560 | return NF_ACCEPT; |
1561 | } | |
7a4f0761 HS |
1562 | /* ipvs enabled in this netns ? */ |
1563 | net = skb_net(skb); | |
0c12582f JA |
1564 | ipvs = net_ipvs(net); |
1565 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1566 | return NF_ACCEPT; |
1567 | ||
63dca2c0 | 1568 | ip_vs_fill_iph_skb(af, skb, &iph); |
cb59155f JA |
1569 | |
1570 | /* Bad... Do not break raw sockets */ | |
1571 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1572 | af == AF_INET)) { | |
1573 | struct sock *sk = skb->sk; | |
1574 | struct inet_sock *inet = inet_sk(skb->sk); | |
1575 | ||
1576 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1577 | return NF_ACCEPT; | |
1578 | } | |
1da177e4 | 1579 | |
94b26551 JV |
1580 | #ifdef CONFIG_IP_VS_IPV6 |
1581 | if (af == AF_INET6) { | |
2f74713d JDB |
1582 | if (!iph.fragoffs && skb_nfct_reasm(skb)) { |
1583 | struct sk_buff *reasm = skb_nfct_reasm(skb); | |
1584 | /* Save fw mark for coming frags. */ | |
1585 | reasm->ipvs_property = 1; | |
1586 | reasm->mark = skb->mark; | |
1587 | } | |
94b26551 | 1588 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { |
1ca5bb54 | 1589 | int related; |
d4383f04 JDB |
1590 | int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum, |
1591 | &iph); | |
1da177e4 | 1592 | |
94b26551 JV |
1593 | if (related) |
1594 | return verdict; | |
94b26551 JV |
1595 | } |
1596 | } else | |
1597 | #endif | |
1598 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 JA |
1599 | int related; |
1600 | int verdict = ip_vs_in_icmp(skb, &related, hooknum); | |
94b26551 JV |
1601 | |
1602 | if (related) | |
1603 | return verdict; | |
94b26551 | 1604 | } |
1da177e4 LT |
1605 | |
1606 | /* Protocol supported? */ | |
9330419d HS |
1607 | pd = ip_vs_proto_data_get(net, iph.protocol); |
1608 | if (unlikely(!pd)) | |
1da177e4 | 1609 | return NF_ACCEPT; |
9330419d | 1610 | pp = pd->pp; |
1da177e4 LT |
1611 | /* |
1612 | * Check if the packet belongs to an existing connection entry | |
1613 | */ | |
d4383f04 | 1614 | cp = pp->conn_in_get(af, skb, &iph, 0); |
63dca2c0 | 1615 | if (unlikely(!cp) && !iph.fragoffs) { |
2f74713d JDB |
1616 | /* No (second) fragments need to enter here, as nf_defrag_ipv6 |
1617 | * replayed fragment zero will already have created the cp | |
1618 | */ | |
1da177e4 LT |
1619 | int v; |
1620 | ||
2f74713d | 1621 | /* Schedule and create new connection entry into &cp */ |
d4383f04 | 1622 | if (!pp->conn_schedule(af, skb, pd, &v, &cp, &iph)) |
1da177e4 LT |
1623 | return v; |
1624 | } | |
1625 | ||
1626 | if (unlikely(!cp)) { | |
1627 | /* sorry, all this trouble for a no-hit :) */ | |
0d79641a | 1628 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
cb59155f | 1629 | "ip_vs_in: packet continues traversal as normal"); |
2f74713d JDB |
1630 | if (iph.fragoffs && !skb_nfct_reasm(skb)) { |
1631 | /* Fragment that couldn't be mapped to a conn entry | |
1632 | * and don't have any pointer to a reasm skb | |
1633 | * is missing module nf_defrag_ipv6 | |
1634 | */ | |
1635 | IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n"); | |
1636 | IP_VS_DBG_PKT(7, af, pp, skb, 0, "unhandled fragment"); | |
1637 | } | |
1da177e4 LT |
1638 | return NF_ACCEPT; |
1639 | } | |
1640 | ||
0d79641a | 1641 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet"); |
1da177e4 LT |
1642 | /* Check the server status */ |
1643 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
1644 | /* the destination server is not available */ | |
1645 | ||
71a8ab6c | 1646 | if (sysctl_expire_nodest_conn(ipvs)) { |
1da177e4 LT |
1647 | /* try to expire the connection immediately */ |
1648 | ip_vs_conn_expire_now(cp); | |
1da177e4 | 1649 | } |
dc8103f2 JA |
1650 | /* don't restart its timer, and silently |
1651 | drop the packet. */ | |
1652 | __ip_vs_conn_put(cp); | |
1da177e4 LT |
1653 | return NF_DROP; |
1654 | } | |
1655 | ||
1656 | ip_vs_in_stats(cp, skb); | |
4a516f11 | 1657 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 | 1658 | if (cp->packet_xmit) |
d4383f04 | 1659 | ret = cp->packet_xmit(skb, cp, pp, &iph); |
1da177e4 LT |
1660 | /* do not touch skb anymore */ |
1661 | else { | |
1662 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
1663 | ret = NF_ACCEPT; | |
1664 | } | |
1665 | ||
efac5276 RB |
1666 | /* Increase its packet counter and check if it is needed |
1667 | * to be synchronized | |
1668 | * | |
1669 | * Sync connection if it is about to close to | |
1670 | * encorage the standby servers to update the connections timeout | |
986a0757 HS |
1671 | * |
1672 | * For ONE_PKT let ip_vs_sync_conn() do the filter work. | |
efac5276 | 1673 | */ |
f131315f | 1674 | |
986a0757 | 1675 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
59e0350e | 1676 | pkts = sysctl_sync_threshold(ipvs); |
986a0757 HS |
1677 | else |
1678 | pkts = atomic_add_return(1, &cp->in_pkts); | |
1679 | ||
749c42b6 JA |
1680 | if (ipvs->sync_state & IP_VS_STATE_MASTER) |
1681 | ip_vs_sync_conn(net, cp, pkts); | |
1da177e4 LT |
1682 | |
1683 | ip_vs_conn_put(cp); | |
1684 | return ret; | |
1685 | } | |
1686 | ||
cb59155f JA |
1687 | /* |
1688 | * AF_INET handler in NF_INET_LOCAL_IN chain | |
1689 | * Schedule and forward packets from remote clients | |
1690 | */ | |
1691 | static unsigned int | |
1692 | ip_vs_remote_request4(unsigned int hooknum, struct sk_buff *skb, | |
1693 | const struct net_device *in, | |
1694 | const struct net_device *out, | |
1695 | int (*okfn)(struct sk_buff *)) | |
1696 | { | |
1697 | return ip_vs_in(hooknum, skb, AF_INET); | |
1698 | } | |
1699 | ||
1700 | /* | |
1701 | * AF_INET handler in NF_INET_LOCAL_OUT chain | |
1702 | * Schedule and forward packets from local clients | |
1703 | */ | |
1704 | static unsigned int | |
1705 | ip_vs_local_request4(unsigned int hooknum, struct sk_buff *skb, | |
1706 | const struct net_device *in, const struct net_device *out, | |
1707 | int (*okfn)(struct sk_buff *)) | |
1708 | { | |
ac69269a | 1709 | return ip_vs_in(hooknum, skb, AF_INET); |
cb59155f JA |
1710 | } |
1711 | ||
1712 | #ifdef CONFIG_IP_VS_IPV6 | |
1713 | ||
2f74713d JDB |
1714 | /* |
1715 | * AF_INET6 fragment handling | |
1716 | * Copy info from first fragment, to the rest of them. | |
1717 | */ | |
1718 | static unsigned int | |
1719 | ip_vs_preroute_frag6(unsigned int hooknum, struct sk_buff *skb, | |
1720 | const struct net_device *in, | |
1721 | const struct net_device *out, | |
1722 | int (*okfn)(struct sk_buff *)) | |
1723 | { | |
1724 | struct sk_buff *reasm = skb_nfct_reasm(skb); | |
1725 | struct net *net; | |
1726 | ||
1727 | /* Skip if not a "replay" from nf_ct_frag6_output or first fragment. | |
1728 | * ipvs_property is set when checking first fragment | |
1729 | * in ip_vs_in() and ip_vs_out(). | |
1730 | */ | |
1731 | if (reasm) | |
1732 | IP_VS_DBG(2, "Fragment recv prop:%d\n", reasm->ipvs_property); | |
1733 | if (!reasm || !reasm->ipvs_property) | |
1734 | return NF_ACCEPT; | |
1735 | ||
1736 | net = skb_net(skb); | |
1737 | if (!net_ipvs(net)->enable) | |
1738 | return NF_ACCEPT; | |
1739 | ||
1740 | /* Copy stored fw mark, saved in ip_vs_{in,out} */ | |
1741 | skb->mark = reasm->mark; | |
1742 | ||
1743 | return NF_ACCEPT; | |
1744 | } | |
1745 | ||
cb59155f JA |
1746 | /* |
1747 | * AF_INET6 handler in NF_INET_LOCAL_IN chain | |
1748 | * Schedule and forward packets from remote clients | |
1749 | */ | |
1750 | static unsigned int | |
1751 | ip_vs_remote_request6(unsigned int hooknum, struct sk_buff *skb, | |
1752 | const struct net_device *in, | |
1753 | const struct net_device *out, | |
1754 | int (*okfn)(struct sk_buff *)) | |
1755 | { | |
1756 | return ip_vs_in(hooknum, skb, AF_INET6); | |
1757 | } | |
1758 | ||
1759 | /* | |
1760 | * AF_INET6 handler in NF_INET_LOCAL_OUT chain | |
1761 | * Schedule and forward packets from local clients | |
1762 | */ | |
1763 | static unsigned int | |
1764 | ip_vs_local_request6(unsigned int hooknum, struct sk_buff *skb, | |
1765 | const struct net_device *in, const struct net_device *out, | |
1766 | int (*okfn)(struct sk_buff *)) | |
1767 | { | |
ac69269a | 1768 | return ip_vs_in(hooknum, skb, AF_INET6); |
cb59155f JA |
1769 | } |
1770 | ||
1771 | #endif | |
1772 | ||
1da177e4 LT |
1773 | |
1774 | /* | |
6e23ae2a | 1775 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
1da177e4 LT |
1776 | * related packets destined for 0.0.0.0/0. |
1777 | * When fwmark-based virtual service is used, such as transparent | |
1778 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1779 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
6e23ae2a | 1780 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
1da177e4 LT |
1781 | * and send them to ip_vs_in_icmp. |
1782 | */ | |
1783 | static unsigned int | |
3db05fea | 1784 | ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
1785 | const struct net_device *in, const struct net_device *out, |
1786 | int (*okfn)(struct sk_buff *)) | |
1787 | { | |
1788 | int r; | |
7a4f0761 | 1789 | struct net *net; |
0c12582f | 1790 | struct netns_ipvs *ipvs; |
1da177e4 | 1791 | |
3db05fea | 1792 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
1da177e4 LT |
1793 | return NF_ACCEPT; |
1794 | ||
7a4f0761 HS |
1795 | /* ipvs enabled in this netns ? */ |
1796 | net = skb_net(skb); | |
0c12582f JA |
1797 | ipvs = net_ipvs(net); |
1798 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1799 | return NF_ACCEPT; |
1800 | ||
3db05fea | 1801 | return ip_vs_in_icmp(skb, &r, hooknum); |
1da177e4 LT |
1802 | } |
1803 | ||
2a3b791e JV |
1804 | #ifdef CONFIG_IP_VS_IPV6 |
1805 | static unsigned int | |
1806 | ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb, | |
1807 | const struct net_device *in, const struct net_device *out, | |
1808 | int (*okfn)(struct sk_buff *)) | |
1809 | { | |
1810 | int r; | |
7a4f0761 | 1811 | struct net *net; |
0c12582f | 1812 | struct netns_ipvs *ipvs; |
63dca2c0 | 1813 | struct ip_vs_iphdr iphdr; |
2a3b791e | 1814 | |
63dca2c0 JDB |
1815 | ip_vs_fill_iph_skb(AF_INET6, skb, &iphdr); |
1816 | if (iphdr.protocol != IPPROTO_ICMPV6) | |
2a3b791e JV |
1817 | return NF_ACCEPT; |
1818 | ||
7a4f0761 HS |
1819 | /* ipvs enabled in this netns ? */ |
1820 | net = skb_net(skb); | |
0c12582f JA |
1821 | ipvs = net_ipvs(net); |
1822 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1823 | return NF_ACCEPT; |
1824 | ||
d4383f04 | 1825 | return ip_vs_in_icmp_v6(skb, &r, hooknum, &iphdr); |
2a3b791e JV |
1826 | } |
1827 | #endif | |
1828 | ||
1da177e4 | 1829 | |
1999414a | 1830 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
cb59155f JA |
1831 | /* After packet filtering, change source only for VS/NAT */ |
1832 | { | |
1833 | .hook = ip_vs_reply4, | |
1834 | .owner = THIS_MODULE, | |
4c809d63 | 1835 | .pf = NFPROTO_IPV4, |
cb59155f | 1836 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1837 | .priority = NF_IP_PRI_NAT_SRC - 2, |
cb59155f | 1838 | }, |
41c5b317 PM |
1839 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1840 | * or VS/NAT(change destination), so that filtering rules can be | |
1841 | * applied to IPVS. */ | |
1842 | { | |
cb59155f | 1843 | .hook = ip_vs_remote_request4, |
41c5b317 | 1844 | .owner = THIS_MODULE, |
4c809d63 | 1845 | .pf = NFPROTO_IPV4, |
cb59155f | 1846 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1847 | .priority = NF_IP_PRI_NAT_SRC - 1, |
41c5b317 | 1848 | }, |
fc604767 | 1849 | /* Before ip_vs_in, change source only for VS/NAT */ |
41c5b317 | 1850 | { |
fc604767 | 1851 | .hook = ip_vs_local_reply4, |
41c5b317 | 1852 | .owner = THIS_MODULE, |
4c809d63 | 1853 | .pf = NFPROTO_IPV4, |
fc604767 | 1854 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1855 | .priority = NF_IP_PRI_NAT_DST + 1, |
41c5b317 | 1856 | }, |
cb59155f JA |
1857 | /* After mangle, schedule and forward local requests */ |
1858 | { | |
1859 | .hook = ip_vs_local_request4, | |
1860 | .owner = THIS_MODULE, | |
4c809d63 | 1861 | .pf = NFPROTO_IPV4, |
cb59155f | 1862 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1863 | .priority = NF_IP_PRI_NAT_DST + 2, |
cb59155f | 1864 | }, |
41c5b317 PM |
1865 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1866 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1867 | { | |
1868 | .hook = ip_vs_forward_icmp, | |
1869 | .owner = THIS_MODULE, | |
4c809d63 | 1870 | .pf = NFPROTO_IPV4, |
cb59155f JA |
1871 | .hooknum = NF_INET_FORWARD, |
1872 | .priority = 99, | |
41c5b317 | 1873 | }, |
fc604767 JA |
1874 | /* After packet filtering, change source only for VS/NAT */ |
1875 | { | |
1876 | .hook = ip_vs_reply4, | |
1877 | .owner = THIS_MODULE, | |
4c809d63 | 1878 | .pf = NFPROTO_IPV4, |
fc604767 JA |
1879 | .hooknum = NF_INET_FORWARD, |
1880 | .priority = 100, | |
1881 | }, | |
473b23d3 | 1882 | #ifdef CONFIG_IP_VS_IPV6 |
2f74713d JDB |
1883 | /* After mangle & nat fetch 2:nd fragment and following */ |
1884 | { | |
1885 | .hook = ip_vs_preroute_frag6, | |
1886 | .owner = THIS_MODULE, | |
1887 | .pf = NFPROTO_IPV6, | |
1888 | .hooknum = NF_INET_PRE_ROUTING, | |
1889 | .priority = NF_IP6_PRI_NAT_DST + 1, | |
1890 | }, | |
cb59155f JA |
1891 | /* After packet filtering, change source only for VS/NAT */ |
1892 | { | |
1893 | .hook = ip_vs_reply6, | |
1894 | .owner = THIS_MODULE, | |
4c809d63 | 1895 | .pf = NFPROTO_IPV6, |
cb59155f | 1896 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1897 | .priority = NF_IP6_PRI_NAT_SRC - 2, |
cb59155f | 1898 | }, |
473b23d3 JV |
1899 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1900 | * or VS/NAT(change destination), so that filtering rules can be | |
1901 | * applied to IPVS. */ | |
1902 | { | |
cb59155f | 1903 | .hook = ip_vs_remote_request6, |
473b23d3 | 1904 | .owner = THIS_MODULE, |
4c809d63 | 1905 | .pf = NFPROTO_IPV6, |
cb59155f | 1906 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1907 | .priority = NF_IP6_PRI_NAT_SRC - 1, |
473b23d3 | 1908 | }, |
fc604767 | 1909 | /* Before ip_vs_in, change source only for VS/NAT */ |
473b23d3 | 1910 | { |
fc604767 | 1911 | .hook = ip_vs_local_reply6, |
473b23d3 | 1912 | .owner = THIS_MODULE, |
4c809d63 | 1913 | .pf = NFPROTO_IPV4, |
fc604767 | 1914 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1915 | .priority = NF_IP6_PRI_NAT_DST + 1, |
473b23d3 | 1916 | }, |
cb59155f JA |
1917 | /* After mangle, schedule and forward local requests */ |
1918 | { | |
1919 | .hook = ip_vs_local_request6, | |
1920 | .owner = THIS_MODULE, | |
4c809d63 | 1921 | .pf = NFPROTO_IPV6, |
cb59155f | 1922 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1923 | .priority = NF_IP6_PRI_NAT_DST + 2, |
cb59155f | 1924 | }, |
473b23d3 JV |
1925 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1926 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1927 | { | |
1928 | .hook = ip_vs_forward_icmp_v6, | |
1929 | .owner = THIS_MODULE, | |
4c809d63 | 1930 | .pf = NFPROTO_IPV6, |
cb59155f JA |
1931 | .hooknum = NF_INET_FORWARD, |
1932 | .priority = 99, | |
473b23d3 | 1933 | }, |
fc604767 JA |
1934 | /* After packet filtering, change source only for VS/NAT */ |
1935 | { | |
1936 | .hook = ip_vs_reply6, | |
1937 | .owner = THIS_MODULE, | |
4c809d63 | 1938 | .pf = NFPROTO_IPV6, |
fc604767 JA |
1939 | .hooknum = NF_INET_FORWARD, |
1940 | .priority = 100, | |
1941 | }, | |
473b23d3 | 1942 | #endif |
1da177e4 | 1943 | }; |
61b1ab45 HS |
1944 | /* |
1945 | * Initialize IP Virtual Server netns mem. | |
1946 | */ | |
1947 | static int __net_init __ip_vs_init(struct net *net) | |
1948 | { | |
1949 | struct netns_ipvs *ipvs; | |
1950 | ||
61b1ab45 | 1951 | ipvs = net_generic(net, ip_vs_net_id); |
0a9ee813 | 1952 | if (ipvs == NULL) |
61b1ab45 | 1953 | return -ENOMEM; |
0a9ee813 | 1954 | |
7a4f0761 HS |
1955 | /* Hold the beast until a service is registerd */ |
1956 | ipvs->enable = 0; | |
f6340ee0 | 1957 | ipvs->net = net; |
61b1ab45 HS |
1958 | /* Counters used for creating unique names */ |
1959 | ipvs->gen = atomic_read(&ipvs_netns_cnt); | |
1960 | atomic_inc(&ipvs_netns_cnt); | |
1961 | net->ipvs = ipvs; | |
7a4f0761 | 1962 | |
503cf15a | 1963 | if (ip_vs_estimator_net_init(net) < 0) |
7a4f0761 HS |
1964 | goto estimator_fail; |
1965 | ||
503cf15a | 1966 | if (ip_vs_control_net_init(net) < 0) |
7a4f0761 HS |
1967 | goto control_fail; |
1968 | ||
503cf15a | 1969 | if (ip_vs_protocol_net_init(net) < 0) |
7a4f0761 HS |
1970 | goto protocol_fail; |
1971 | ||
503cf15a | 1972 | if (ip_vs_app_net_init(net) < 0) |
7a4f0761 HS |
1973 | goto app_fail; |
1974 | ||
503cf15a | 1975 | if (ip_vs_conn_net_init(net) < 0) |
7a4f0761 HS |
1976 | goto conn_fail; |
1977 | ||
503cf15a | 1978 | if (ip_vs_sync_net_init(net) < 0) |
7a4f0761 HS |
1979 | goto sync_fail; |
1980 | ||
a870c8c5 | 1981 | printk(KERN_INFO "IPVS: Creating netns size=%zu id=%d\n", |
61b1ab45 HS |
1982 | sizeof(struct netns_ipvs), ipvs->gen); |
1983 | return 0; | |
7a4f0761 HS |
1984 | /* |
1985 | * Error handling | |
1986 | */ | |
1987 | ||
1988 | sync_fail: | |
503cf15a | 1989 | ip_vs_conn_net_cleanup(net); |
7a4f0761 | 1990 | conn_fail: |
503cf15a | 1991 | ip_vs_app_net_cleanup(net); |
7a4f0761 | 1992 | app_fail: |
503cf15a | 1993 | ip_vs_protocol_net_cleanup(net); |
7a4f0761 | 1994 | protocol_fail: |
503cf15a | 1995 | ip_vs_control_net_cleanup(net); |
7a4f0761 | 1996 | control_fail: |
503cf15a | 1997 | ip_vs_estimator_net_cleanup(net); |
7a4f0761 | 1998 | estimator_fail: |
39f618b4 | 1999 | net->ipvs = NULL; |
7a4f0761 | 2000 | return -ENOMEM; |
61b1ab45 HS |
2001 | } |
2002 | ||
2003 | static void __net_exit __ip_vs_cleanup(struct net *net) | |
2004 | { | |
503cf15a HS |
2005 | ip_vs_service_net_cleanup(net); /* ip_vs_flush() with locks */ |
2006 | ip_vs_conn_net_cleanup(net); | |
2007 | ip_vs_app_net_cleanup(net); | |
2008 | ip_vs_protocol_net_cleanup(net); | |
2009 | ip_vs_control_net_cleanup(net); | |
2010 | ip_vs_estimator_net_cleanup(net); | |
1ae132b0 | 2011 | IP_VS_DBG(2, "ipvs netns %d released\n", net_ipvs(net)->gen); |
39f618b4 | 2012 | net->ipvs = NULL; |
61b1ab45 HS |
2013 | } |
2014 | ||
7a4f0761 HS |
2015 | static void __net_exit __ip_vs_dev_cleanup(struct net *net) |
2016 | { | |
2017 | EnterFunction(2); | |
2018 | net_ipvs(net)->enable = 0; /* Disable packet reception */ | |
8f4e0a18 | 2019 | smp_wmb(); |
503cf15a | 2020 | ip_vs_sync_net_cleanup(net); |
7a4f0761 HS |
2021 | LeaveFunction(2); |
2022 | } | |
2023 | ||
61b1ab45 HS |
2024 | static struct pernet_operations ipvs_core_ops = { |
2025 | .init = __ip_vs_init, | |
2026 | .exit = __ip_vs_cleanup, | |
2027 | .id = &ip_vs_net_id, | |
2028 | .size = sizeof(struct netns_ipvs), | |
2029 | }; | |
1da177e4 | 2030 | |
7a4f0761 HS |
2031 | static struct pernet_operations ipvs_core_dev_ops = { |
2032 | .exit = __ip_vs_dev_cleanup, | |
2033 | }; | |
2034 | ||
1da177e4 LT |
2035 | /* |
2036 | * Initialize IP Virtual Server | |
2037 | */ | |
2038 | static int __init ip_vs_init(void) | |
2039 | { | |
2040 | int ret; | |
2041 | ||
2042 | ret = ip_vs_control_init(); | |
2043 | if (ret < 0) { | |
1e3e238e | 2044 | pr_err("can't setup control.\n"); |
6c8f7949 | 2045 | goto exit; |
1da177e4 LT |
2046 | } |
2047 | ||
2048 | ip_vs_protocol_init(); | |
2049 | ||
1da177e4 LT |
2050 | ret = ip_vs_conn_init(); |
2051 | if (ret < 0) { | |
1e3e238e | 2052 | pr_err("can't setup connection table.\n"); |
6c8f7949 | 2053 | goto cleanup_protocol; |
61b1ab45 HS |
2054 | } |
2055 | ||
7a4f0761 HS |
2056 | ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */ |
2057 | if (ret < 0) | |
6c8f7949 | 2058 | goto cleanup_conn; |
7a4f0761 HS |
2059 | |
2060 | ret = register_pernet_device(&ipvs_core_dev_ops); | |
2061 | if (ret < 0) | |
2062 | goto cleanup_sub; | |
2063 | ||
41c5b317 | 2064 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 | 2065 | if (ret < 0) { |
1e3e238e | 2066 | pr_err("can't register hooks.\n"); |
7a4f0761 | 2067 | goto cleanup_dev; |
1da177e4 LT |
2068 | } |
2069 | ||
8537de8a HS |
2070 | ret = ip_vs_register_nl_ioctl(); |
2071 | if (ret < 0) { | |
2072 | pr_err("can't register netlink/ioctl.\n"); | |
2073 | goto cleanup_hooks; | |
2074 | } | |
2075 | ||
1e3e238e | 2076 | pr_info("ipvs loaded.\n"); |
7a4f0761 | 2077 | |
1da177e4 LT |
2078 | return ret; |
2079 | ||
8537de8a HS |
2080 | cleanup_hooks: |
2081 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); | |
7a4f0761 HS |
2082 | cleanup_dev: |
2083 | unregister_pernet_device(&ipvs_core_dev_ops); | |
2084 | cleanup_sub: | |
2085 | unregister_pernet_subsys(&ipvs_core_ops); | |
552ad65a | 2086 | cleanup_conn: |
1da177e4 | 2087 | ip_vs_conn_cleanup(); |
552ad65a | 2088 | cleanup_protocol: |
1da177e4 LT |
2089 | ip_vs_protocol_cleanup(); |
2090 | ip_vs_control_cleanup(); | |
6c8f7949 | 2091 | exit: |
1da177e4 LT |
2092 | return ret; |
2093 | } | |
2094 | ||
2095 | static void __exit ip_vs_cleanup(void) | |
2096 | { | |
8537de8a | 2097 | ip_vs_unregister_nl_ioctl(); |
41c5b317 | 2098 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
7a4f0761 HS |
2099 | unregister_pernet_device(&ipvs_core_dev_ops); |
2100 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ | |
1da177e4 | 2101 | ip_vs_conn_cleanup(); |
1da177e4 LT |
2102 | ip_vs_protocol_cleanup(); |
2103 | ip_vs_control_cleanup(); | |
1e3e238e | 2104 | pr_info("ipvs unloaded.\n"); |
1da177e4 LT |
2105 | } |
2106 | ||
2107 | module_init(ip_vs_init); | |
2108 | module_exit(ip_vs_cleanup); | |
2109 | MODULE_LICENSE("GPL"); |