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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPVS An implementation of the IP virtual server support for the | |
3 | * LINUX operating system. IPVS is now implemented as a module | |
4 | * over the Netfilter framework. IPVS can be used to build a | |
5 | * high-performance and highly available server based on a | |
6 | * cluster of servers. | |
7 | * | |
1da177e4 LT |
8 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
9 | * Peter Kese <peter.kese@ijs.si> | |
10 | * Julian Anastasov <ja@ssi.bg> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | * | |
17 | * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, | |
18 | * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms | |
19 | * and others. | |
20 | * | |
21 | * Changes: | |
22 | * Paul `Rusty' Russell properly handle non-linear skbs | |
6869c4d8 | 23 | * Harald Welte don't use nfcache |
1da177e4 LT |
24 | * |
25 | */ | |
26 | ||
9aada7ac HE |
27 | #define KMSG_COMPONENT "IPVS" |
28 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/kernel.h> | |
32 | #include <linux/ip.h> | |
33 | #include <linux/tcp.h> | |
2906f66a | 34 | #include <linux/sctp.h> |
1da177e4 | 35 | #include <linux/icmp.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 LT |
37 | |
38 | #include <net/ip.h> | |
39 | #include <net/tcp.h> | |
40 | #include <net/udp.h> | |
41 | #include <net/icmp.h> /* for icmp_send */ | |
42 | #include <net/route.h> | |
2c70b519 | 43 | #include <net/ip6_checksum.h> |
61b1ab45 | 44 | #include <net/netns/generic.h> /* net_generic() */ |
1da177e4 LT |
45 | |
46 | #include <linux/netfilter.h> | |
47 | #include <linux/netfilter_ipv4.h> | |
48 | ||
2a3b791e JV |
49 | #ifdef CONFIG_IP_VS_IPV6 |
50 | #include <net/ipv6.h> | |
51 | #include <linux/netfilter_ipv6.h> | |
489fdeda | 52 | #include <net/ip6_route.h> |
2a3b791e JV |
53 | #endif |
54 | ||
1da177e4 LT |
55 | #include <net/ip_vs.h> |
56 | ||
57 | ||
58 | EXPORT_SYMBOL(register_ip_vs_scheduler); | |
59 | EXPORT_SYMBOL(unregister_ip_vs_scheduler); | |
1da177e4 LT |
60 | EXPORT_SYMBOL(ip_vs_proto_name); |
61 | EXPORT_SYMBOL(ip_vs_conn_new); | |
62 | EXPORT_SYMBOL(ip_vs_conn_in_get); | |
63 | EXPORT_SYMBOL(ip_vs_conn_out_get); | |
64 | #ifdef CONFIG_IP_VS_PROTO_TCP | |
65 | EXPORT_SYMBOL(ip_vs_tcp_conn_listen); | |
66 | #endif | |
67 | EXPORT_SYMBOL(ip_vs_conn_put); | |
68 | #ifdef CONFIG_IP_VS_DEBUG | |
69 | EXPORT_SYMBOL(ip_vs_get_debug_level); | |
70 | #endif | |
1da177e4 | 71 | |
61b1ab45 HS |
72 | int ip_vs_net_id __read_mostly; |
73 | #ifdef IP_VS_GENERIC_NETNS | |
74 | EXPORT_SYMBOL(ip_vs_net_id); | |
75 | #endif | |
76 | /* netns cnt used for uniqueness */ | |
77 | static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0); | |
1da177e4 LT |
78 | |
79 | /* ID used in ICMP lookups */ | |
80 | #define icmp_id(icmph) (((icmph)->un).echo.id) | |
2a3b791e | 81 | #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier) |
1da177e4 LT |
82 | |
83 | const char *ip_vs_proto_name(unsigned proto) | |
84 | { | |
85 | static char buf[20]; | |
86 | ||
87 | switch (proto) { | |
88 | case IPPROTO_IP: | |
89 | return "IP"; | |
90 | case IPPROTO_UDP: | |
91 | return "UDP"; | |
92 | case IPPROTO_TCP: | |
93 | return "TCP"; | |
2906f66a VMR |
94 | case IPPROTO_SCTP: |
95 | return "SCTP"; | |
1da177e4 LT |
96 | case IPPROTO_ICMP: |
97 | return "ICMP"; | |
2a3b791e JV |
98 | #ifdef CONFIG_IP_VS_IPV6 |
99 | case IPPROTO_ICMPV6: | |
100 | return "ICMPv6"; | |
101 | #endif | |
1da177e4 LT |
102 | default: |
103 | sprintf(buf, "IP_%d", proto); | |
104 | return buf; | |
105 | } | |
106 | } | |
107 | ||
108 | void ip_vs_init_hash_table(struct list_head *table, int rows) | |
109 | { | |
110 | while (--rows >= 0) | |
111 | INIT_LIST_HEAD(&table[rows]); | |
112 | } | |
113 | ||
114 | static inline void | |
115 | ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
116 | { | |
117 | struct ip_vs_dest *dest = cp->dest; | |
b17fc996 HS |
118 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
119 | ||
1da177e4 | 120 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
b17fc996 HS |
121 | struct ip_vs_cpu_stats *s; |
122 | ||
123 | s = this_cpu_ptr(dest->stats.cpustats); | |
124 | s->ustats.inpkts++; | |
125 | u64_stats_update_begin(&s->syncp); | |
126 | s->ustats.inbytes += skb->len; | |
127 | u64_stats_update_end(&s->syncp); | |
128 | ||
129 | s = this_cpu_ptr(dest->svc->stats.cpustats); | |
130 | s->ustats.inpkts++; | |
131 | u64_stats_update_begin(&s->syncp); | |
132 | s->ustats.inbytes += skb->len; | |
133 | u64_stats_update_end(&s->syncp); | |
134 | ||
135 | s = this_cpu_ptr(ipvs->cpustats); | |
136 | s->ustats.inpkts++; | |
137 | u64_stats_update_begin(&s->syncp); | |
138 | s->ustats.inbytes += skb->len; | |
139 | u64_stats_update_end(&s->syncp); | |
1da177e4 LT |
140 | } |
141 | } | |
142 | ||
143 | ||
144 | static inline void | |
145 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
146 | { | |
147 | struct ip_vs_dest *dest = cp->dest; | |
b17fc996 HS |
148 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
149 | ||
1da177e4 | 150 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
b17fc996 HS |
151 | struct ip_vs_cpu_stats *s; |
152 | ||
153 | s = this_cpu_ptr(dest->stats.cpustats); | |
154 | s->ustats.outpkts++; | |
155 | u64_stats_update_begin(&s->syncp); | |
156 | s->ustats.outbytes += skb->len; | |
157 | u64_stats_update_end(&s->syncp); | |
158 | ||
159 | s = this_cpu_ptr(dest->svc->stats.cpustats); | |
160 | s->ustats.outpkts++; | |
161 | u64_stats_update_begin(&s->syncp); | |
162 | s->ustats.outbytes += skb->len; | |
163 | u64_stats_update_end(&s->syncp); | |
164 | ||
165 | s = this_cpu_ptr(ipvs->cpustats); | |
166 | s->ustats.outpkts++; | |
167 | u64_stats_update_begin(&s->syncp); | |
168 | s->ustats.outbytes += skb->len; | |
169 | u64_stats_update_end(&s->syncp); | |
1da177e4 LT |
170 | } |
171 | } | |
172 | ||
173 | ||
174 | static inline void | |
175 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) | |
176 | { | |
b17fc996 HS |
177 | struct netns_ipvs *ipvs = net_ipvs(svc->net); |
178 | struct ip_vs_cpu_stats *s; | |
1da177e4 | 179 | |
b17fc996 HS |
180 | s = this_cpu_ptr(cp->dest->stats.cpustats); |
181 | s->ustats.conns++; | |
1da177e4 | 182 | |
b17fc996 HS |
183 | s = this_cpu_ptr(svc->stats.cpustats); |
184 | s->ustats.conns++; | |
185 | ||
186 | s = this_cpu_ptr(ipvs->cpustats); | |
187 | s->ustats.conns++; | |
1da177e4 LT |
188 | } |
189 | ||
190 | ||
191 | static inline int | |
192 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, | |
193 | const struct sk_buff *skb, | |
9330419d | 194 | struct ip_vs_proto_data *pd) |
1da177e4 | 195 | { |
9330419d | 196 | if (unlikely(!pd->pp->state_transition)) |
1da177e4 | 197 | return 0; |
9330419d | 198 | return pd->pp->state_transition(cp, direction, skb, pd); |
1da177e4 LT |
199 | } |
200 | ||
a5959d53 | 201 | static inline int |
85999283 SH |
202 | ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc, |
203 | struct sk_buff *skb, int protocol, | |
204 | const union nf_inet_addr *caddr, __be16 cport, | |
205 | const union nf_inet_addr *vaddr, __be16 vport, | |
206 | struct ip_vs_conn_param *p) | |
207 | { | |
6e67e586 HS |
208 | ip_vs_conn_fill_param(svc->net, svc->af, protocol, caddr, cport, vaddr, |
209 | vport, p); | |
85999283 SH |
210 | p->pe = svc->pe; |
211 | if (p->pe && p->pe->fill_param) | |
a5959d53 HS |
212 | return p->pe->fill_param(p, skb); |
213 | ||
214 | return 0; | |
85999283 | 215 | } |
1da177e4 | 216 | |
1da177e4 LT |
217 | /* |
218 | * IPVS persistent scheduling function | |
219 | * It creates a connection entry according to its template if exists, | |
220 | * or selects a server and creates a connection entry plus a template. | |
221 | * Locking: we are svc user (svc->refcnt), so we hold all dests too | |
222 | * Protocols supported: TCP, UDP | |
223 | */ | |
224 | static struct ip_vs_conn * | |
225 | ip_vs_sched_persist(struct ip_vs_service *svc, | |
85999283 | 226 | struct sk_buff *skb, |
a5959d53 | 227 | __be16 src_port, __be16 dst_port, int *ignored) |
1da177e4 LT |
228 | { |
229 | struct ip_vs_conn *cp = NULL; | |
28364a59 | 230 | struct ip_vs_iphdr iph; |
1da177e4 LT |
231 | struct ip_vs_dest *dest; |
232 | struct ip_vs_conn *ct; | |
5b57a98c | 233 | __be16 dport = 0; /* destination port to forward */ |
3575792e | 234 | unsigned int flags; |
f11017ec | 235 | struct ip_vs_conn_param param; |
28364a59 JV |
236 | union nf_inet_addr snet; /* source network of the client, |
237 | after masking */ | |
cd17f9ed JV |
238 | |
239 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); | |
1da177e4 LT |
240 | |
241 | /* Mask saddr with the netmask to adjust template granularity */ | |
cd17f9ed JV |
242 | #ifdef CONFIG_IP_VS_IPV6 |
243 | if (svc->af == AF_INET6) | |
244 | ipv6_addr_prefix(&snet.in6, &iph.saddr.in6, svc->netmask); | |
245 | else | |
246 | #endif | |
247 | snet.ip = iph.saddr.ip & svc->netmask; | |
1da177e4 | 248 | |
cd17f9ed JV |
249 | IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " |
250 | "mnet %s\n", | |
ce144f24 HS |
251 | IP_VS_DBG_ADDR(svc->af, &iph.saddr), ntohs(src_port), |
252 | IP_VS_DBG_ADDR(svc->af, &iph.daddr), ntohs(dst_port), | |
cd17f9ed | 253 | IP_VS_DBG_ADDR(svc->af, &snet)); |
1da177e4 LT |
254 | |
255 | /* | |
256 | * As far as we know, FTP is a very complicated network protocol, and | |
257 | * it uses control connection and data connections. For active FTP, | |
258 | * FTP server initialize data connection to the client, its source port | |
259 | * is often 20. For passive FTP, FTP server tells the clients the port | |
260 | * that it passively listens to, and the client issues the data | |
261 | * connection. In the tunneling or direct routing mode, the load | |
262 | * balancer is on the client-to-server half of connection, the port | |
263 | * number is unknown to the load balancer. So, a conn template like | |
264 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP | |
265 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> | |
266 | * is created for other persistent services. | |
267 | */ | |
5b57a98c | 268 | { |
f11017ec SH |
269 | int protocol = iph.protocol; |
270 | const union nf_inet_addr *vaddr = &iph.daddr; | |
271 | const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) }; | |
272 | __be16 vport = 0; | |
273 | ||
ce144f24 | 274 | if (dst_port == svc->port) { |
5b57a98c SH |
275 | /* non-FTP template: |
276 | * <protocol, caddr, 0, vaddr, vport, daddr, dport> | |
277 | * FTP template: | |
278 | * <protocol, caddr, 0, vaddr, 0, daddr, 0> | |
1da177e4 LT |
279 | */ |
280 | if (svc->port != FTPPORT) | |
ce144f24 | 281 | vport = dst_port; |
1da177e4 | 282 | } else { |
5b57a98c SH |
283 | /* Note: persistent fwmark-based services and |
284 | * persistent port zero service are handled here. | |
285 | * fwmark template: | |
286 | * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> | |
287 | * port zero template: | |
288 | * <protocol,caddr,0,vaddr,0,daddr,0> | |
1da177e4 | 289 | */ |
28364a59 | 290 | if (svc->fwmark) { |
5b57a98c SH |
291 | protocol = IPPROTO_IP; |
292 | vaddr = &fwmark; | |
293 | } | |
1da177e4 | 294 | } |
a5959d53 HS |
295 | /* return *ignored = -1 so NF_DROP can be used */ |
296 | if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0, | |
297 | vaddr, vport, ¶m) < 0) { | |
298 | *ignored = -1; | |
299 | return NULL; | |
300 | } | |
1da177e4 LT |
301 | } |
302 | ||
5b57a98c | 303 | /* Check if a template already exists */ |
f11017ec | 304 | ct = ip_vs_ct_in_get(¶m); |
5b57a98c | 305 | if (!ct || !ip_vs_check_template(ct)) { |
a5959d53 HS |
306 | /* |
307 | * No template found or the dest of the connection | |
5b57a98c | 308 | * template is not available. |
a5959d53 | 309 | * return *ignored=0 i.e. ICMP and NF_DROP |
5b57a98c SH |
310 | */ |
311 | dest = svc->scheduler->schedule(svc, skb); | |
312 | if (!dest) { | |
313 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
85999283 | 314 | kfree(param.pe_data); |
a5959d53 | 315 | *ignored = 0; |
5b57a98c SH |
316 | return NULL; |
317 | } | |
318 | ||
ce144f24 | 319 | if (dst_port == svc->port && svc->port != FTPPORT) |
5b57a98c SH |
320 | dport = dest->port; |
321 | ||
85999283 SH |
322 | /* Create a template |
323 | * This adds param.pe_data to the template, | |
324 | * and thus param.pe_data will be destroyed | |
325 | * when the template expires */ | |
f11017ec | 326 | ct = ip_vs_conn_new(¶m, &dest->addr, dport, |
0e051e68 | 327 | IP_VS_CONN_F_TEMPLATE, dest, skb->mark); |
85999283 SH |
328 | if (ct == NULL) { |
329 | kfree(param.pe_data); | |
a5959d53 | 330 | *ignored = -1; |
5b57a98c | 331 | return NULL; |
85999283 | 332 | } |
5b57a98c SH |
333 | |
334 | ct->timeout = svc->timeout; | |
85999283 | 335 | } else { |
5b57a98c SH |
336 | /* set destination with the found template */ |
337 | dest = ct->dest; | |
85999283 SH |
338 | kfree(param.pe_data); |
339 | } | |
5b57a98c | 340 | |
ce144f24 | 341 | dport = dst_port; |
5b57a98c SH |
342 | if (dport == svc->port && dest->port) |
343 | dport = dest->port; | |
344 | ||
26ec037f NC |
345 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
346 | && iph.protocol == IPPROTO_UDP)? | |
347 | IP_VS_CONN_F_ONE_PACKET : 0; | |
348 | ||
1da177e4 LT |
349 | /* |
350 | * Create a new connection according to the template | |
351 | */ | |
6e67e586 HS |
352 | ip_vs_conn_fill_param(svc->net, svc->af, iph.protocol, &iph.saddr, |
353 | src_port, &iph.daddr, dst_port, ¶m); | |
ce144f24 | 354 | |
0e051e68 | 355 | cp = ip_vs_conn_new(¶m, &dest->addr, dport, flags, dest, skb->mark); |
1da177e4 LT |
356 | if (cp == NULL) { |
357 | ip_vs_conn_put(ct); | |
a5959d53 | 358 | *ignored = -1; |
1da177e4 LT |
359 | return NULL; |
360 | } | |
361 | ||
362 | /* | |
363 | * Add its control | |
364 | */ | |
365 | ip_vs_control_add(cp, ct); | |
366 | ip_vs_conn_put(ct); | |
367 | ||
368 | ip_vs_conn_stats(cp, svc); | |
369 | return cp; | |
370 | } | |
371 | ||
372 | ||
373 | /* | |
374 | * IPVS main scheduling function | |
375 | * It selects a server according to the virtual service, and | |
376 | * creates a connection entry. | |
377 | * Protocols supported: TCP, UDP | |
a5959d53 HS |
378 | * |
379 | * Usage of *ignored | |
380 | * | |
381 | * 1 : protocol tried to schedule (eg. on SYN), found svc but the | |
382 | * svc/scheduler decides that this packet should be accepted with | |
383 | * NF_ACCEPT because it must not be scheduled. | |
384 | * | |
385 | * 0 : scheduler can not find destination, so try bypass or | |
386 | * return ICMP and then NF_DROP (ip_vs_leave). | |
387 | * | |
388 | * -1 : scheduler tried to schedule but fatal error occurred, eg. | |
389 | * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param | |
390 | * failure such as missing Call-ID, ENOMEM on skb_linearize | |
391 | * or pe_data. In this case we should return NF_DROP without | |
392 | * any attempts to send ICMP with ip_vs_leave. | |
1da177e4 LT |
393 | */ |
394 | struct ip_vs_conn * | |
190ecd27 | 395 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
9330419d | 396 | struct ip_vs_proto_data *pd, int *ignored) |
1da177e4 | 397 | { |
9330419d | 398 | struct ip_vs_protocol *pp = pd->pp; |
1da177e4 | 399 | struct ip_vs_conn *cp = NULL; |
28364a59 | 400 | struct ip_vs_iphdr iph; |
1da177e4 | 401 | struct ip_vs_dest *dest; |
3575792e JA |
402 | __be16 _ports[2], *pptr; |
403 | unsigned int flags; | |
1da177e4 | 404 | |
190ecd27 | 405 | *ignored = 1; |
28364a59 JV |
406 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); |
407 | pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports); | |
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) && | |
9330419d | 427 | (cp = pp->conn_in_get(svc->af, skb, &iph, iph.len, 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 HS |
437 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) |
438 | return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored); | |
439 | ||
440 | *ignored = 0; | |
1da177e4 LT |
441 | |
442 | /* | |
443 | * Non-persistent service | |
444 | */ | |
445 | if (!svc->fwmark && pptr[1] != svc->port) { | |
446 | if (!svc->port) | |
1e3e238e HE |
447 | pr_err("Schedule: port zero only supported " |
448 | "in persistent services, " | |
449 | "check your ipvs configuration\n"); | |
1da177e4 LT |
450 | return NULL; |
451 | } | |
452 | ||
453 | dest = svc->scheduler->schedule(svc, skb); | |
454 | if (dest == NULL) { | |
455 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
456 | return NULL; | |
457 | } | |
458 | ||
26ec037f NC |
459 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
460 | && iph.protocol == IPPROTO_UDP)? | |
461 | IP_VS_CONN_F_ONE_PACKET : 0; | |
462 | ||
1da177e4 LT |
463 | /* |
464 | * Create a connection entry. | |
465 | */ | |
f11017ec SH |
466 | { |
467 | struct ip_vs_conn_param p; | |
6e67e586 HS |
468 | |
469 | ip_vs_conn_fill_param(svc->net, svc->af, iph.protocol, | |
470 | &iph.saddr, pptr[0], &iph.daddr, pptr[1], | |
471 | &p); | |
f11017ec SH |
472 | cp = ip_vs_conn_new(&p, &dest->addr, |
473 | dest->port ? dest->port : pptr[1], | |
0e051e68 | 474 | flags, dest, skb->mark); |
a5959d53 HS |
475 | if (!cp) { |
476 | *ignored = -1; | |
f11017ec | 477 | return NULL; |
a5959d53 | 478 | } |
f11017ec | 479 | } |
1da177e4 | 480 | |
cd17f9ed JV |
481 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
482 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", | |
483 | ip_vs_fwd_tag(cp), | |
484 | IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport), | |
485 | IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport), | |
486 | IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport), | |
487 | cp->flags, atomic_read(&cp->refcnt)); | |
1da177e4 LT |
488 | |
489 | ip_vs_conn_stats(cp, svc); | |
490 | return cp; | |
491 | } | |
492 | ||
493 | ||
494 | /* | |
495 | * Pass or drop the packet. | |
496 | * Called by ip_vs_in, when the virtual service is available but | |
497 | * no destination is available for a new connection. | |
498 | */ | |
499 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
9330419d | 500 | struct ip_vs_proto_data *pd) |
1da177e4 | 501 | { |
4a98480b | 502 | struct net *net; |
a0840e2e | 503 | struct netns_ipvs *ipvs; |
014d730d | 504 | __be16 _ports[2], *pptr; |
28364a59 | 505 | struct ip_vs_iphdr iph; |
2a3b791e | 506 | int unicast; |
9330419d | 507 | |
2a3b791e | 508 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); |
1da177e4 | 509 | |
28364a59 | 510 | pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports); |
1da177e4 LT |
511 | if (pptr == NULL) { |
512 | ip_vs_service_put(svc); | |
513 | return NF_DROP; | |
514 | } | |
4a98480b | 515 | net = skb_net(skb); |
1da177e4 | 516 | |
2a3b791e JV |
517 | #ifdef CONFIG_IP_VS_IPV6 |
518 | if (svc->af == AF_INET6) | |
519 | unicast = ipv6_addr_type(&iph.daddr.in6) & IPV6_ADDR_UNICAST; | |
520 | else | |
521 | #endif | |
4a98480b | 522 | unicast = (inet_addr_type(net, iph.daddr.ip) == RTN_UNICAST); |
2a3b791e | 523 | |
1da177e4 | 524 | /* if it is fwmark-based service, the cache_bypass sysctl is up |
2a3b791e | 525 | and the destination is a non-local unicast, then create |
1da177e4 | 526 | a cache_bypass connection entry */ |
4a98480b | 527 | ipvs = net_ipvs(net); |
a0840e2e | 528 | if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) { |
1da177e4 LT |
529 | int ret, cs; |
530 | struct ip_vs_conn *cp; | |
3575792e JA |
531 | unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && |
532 | iph.protocol == IPPROTO_UDP)? | |
533 | IP_VS_CONN_F_ONE_PACKET : 0; | |
dff630dd | 534 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
1da177e4 LT |
535 | |
536 | ip_vs_service_put(svc); | |
537 | ||
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; | |
6e67e586 | 542 | ip_vs_conn_fill_param(svc->net, svc->af, iph.protocol, |
f11017ec SH |
543 | &iph.saddr, pptr[0], |
544 | &iph.daddr, pptr[1], &p); | |
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 */ | |
9330419d | 556 | cs = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 LT |
557 | |
558 | /* transmit the first SYN packet */ | |
9330419d | 559 | ret = cp->packet_xmit(skb, cp, pd->pp); |
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 | } | |
566 | ||
567 | /* | |
568 | * When the virtual ftp service is presented, packets destined | |
569 | * for other services on the VIP may get here (except services | |
570 | * listed in the ipvs table), pass the packets, because it is | |
571 | * not ipvs job to decide to drop the packets. | |
572 | */ | |
573 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) { | |
574 | ip_vs_service_put(svc); | |
575 | return NF_ACCEPT; | |
576 | } | |
577 | ||
578 | ip_vs_service_put(svc); | |
579 | ||
580 | /* | |
581 | * Notify the client that the destination is unreachable, and | |
582 | * release the socket buffer. | |
583 | * Since it is in IP layer, the TCP socket is not actually | |
584 | * created, the TCP RST packet cannot be sent, instead that | |
585 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
586 | */ | |
2a3b791e | 587 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f JA |
588 | if (svc->af == AF_INET6) { |
589 | if (!skb->dev) { | |
590 | struct net *net = dev_net(skb_dst(skb)->dev); | |
591 | ||
592 | skb->dev = net->loopback_dev; | |
593 | } | |
3ffe533c | 594 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
cb59155f | 595 | } else |
2a3b791e JV |
596 | #endif |
597 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
598 | ||
1da177e4 LT |
599 | return NF_DROP; |
600 | } | |
601 | ||
b1550f22 | 602 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
1da177e4 | 603 | { |
d3bc23e7 | 604 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
1da177e4 LT |
605 | } |
606 | ||
1ca5bb54 JA |
607 | static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum) |
608 | { | |
609 | if (NF_INET_LOCAL_IN == hooknum) | |
610 | return IP_DEFRAG_VS_IN; | |
611 | if (NF_INET_FORWARD == hooknum) | |
612 | return IP_DEFRAG_VS_FWD; | |
613 | return IP_DEFRAG_VS_OUT; | |
614 | } | |
615 | ||
776c729e | 616 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
1da177e4 | 617 | { |
776c729e HX |
618 | int err = ip_defrag(skb, user); |
619 | ||
620 | if (!err) | |
eddc9ec5 | 621 | ip_send_check(ip_hdr(skb)); |
776c729e HX |
622 | |
623 | return err; | |
1da177e4 LT |
624 | } |
625 | ||
2a3b791e JV |
626 | #ifdef CONFIG_IP_VS_IPV6 |
627 | static inline int ip_vs_gather_frags_v6(struct sk_buff *skb, u_int32_t user) | |
628 | { | |
629 | /* TODO IPv6: Find out what to do here for IPv6 */ | |
630 | return 0; | |
631 | } | |
632 | #endif | |
633 | ||
1da177e4 LT |
634 | /* |
635 | * Packet has been made sufficiently writable in caller | |
636 | * - inout: 1=in->out, 0=out->in | |
637 | */ | |
638 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
639 | struct ip_vs_conn *cp, int inout) | |
640 | { | |
eddc9ec5 | 641 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 642 | unsigned int icmp_offset = iph->ihl*4; |
d56f90a7 ACM |
643 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
644 | icmp_offset); | |
1da177e4 LT |
645 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
646 | ||
647 | if (inout) { | |
e7ade46a | 648 | iph->saddr = cp->vaddr.ip; |
1da177e4 | 649 | ip_send_check(iph); |
e7ade46a | 650 | ciph->daddr = cp->vaddr.ip; |
1da177e4 LT |
651 | ip_send_check(ciph); |
652 | } else { | |
e7ade46a | 653 | iph->daddr = cp->daddr.ip; |
1da177e4 | 654 | ip_send_check(iph); |
e7ade46a | 655 | ciph->saddr = cp->daddr.ip; |
1da177e4 LT |
656 | ip_send_check(ciph); |
657 | } | |
658 | ||
2906f66a VMR |
659 | /* the TCP/UDP/SCTP port */ |
660 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || | |
661 | IPPROTO_SCTP == ciph->protocol) { | |
014d730d | 662 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
1da177e4 LT |
663 | |
664 | if (inout) | |
665 | ports[1] = cp->vport; | |
666 | else | |
667 | ports[0] = cp->dport; | |
668 | } | |
669 | ||
670 | /* And finally the ICMP checksum */ | |
671 | icmph->checksum = 0; | |
672 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
673 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
674 | ||
675 | if (inout) | |
0d79641a | 676 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
677 | "Forwarding altered outgoing ICMP"); |
678 | else | |
0d79641a | 679 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
680 | "Forwarding altered incoming ICMP"); |
681 | } | |
682 | ||
b3cdd2a7 JV |
683 | #ifdef CONFIG_IP_VS_IPV6 |
684 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
685 | struct ip_vs_conn *cp, int inout) | |
686 | { | |
687 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
688 | unsigned int icmp_offset = sizeof(struct ipv6hdr); | |
689 | struct icmp6hdr *icmph = (struct icmp6hdr *)(skb_network_header(skb) + | |
690 | icmp_offset); | |
691 | struct ipv6hdr *ciph = (struct ipv6hdr *)(icmph + 1); | |
692 | ||
693 | if (inout) { | |
694 | iph->saddr = cp->vaddr.in6; | |
695 | ciph->daddr = cp->vaddr.in6; | |
696 | } else { | |
697 | iph->daddr = cp->daddr.in6; | |
698 | ciph->saddr = cp->daddr.in6; | |
699 | } | |
700 | ||
2906f66a VMR |
701 | /* the TCP/UDP/SCTP port */ |
702 | if (IPPROTO_TCP == ciph->nexthdr || IPPROTO_UDP == ciph->nexthdr || | |
703 | IPPROTO_SCTP == ciph->nexthdr) { | |
b3cdd2a7 JV |
704 | __be16 *ports = (void *)ciph + sizeof(struct ipv6hdr); |
705 | ||
706 | if (inout) | |
707 | ports[1] = cp->vport; | |
708 | else | |
709 | ports[0] = cp->dport; | |
710 | } | |
711 | ||
712 | /* And finally the ICMP checksum */ | |
8870f842 SH |
713 | icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, |
714 | skb->len - icmp_offset, | |
715 | IPPROTO_ICMPV6, 0); | |
716 | skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset; | |
717 | skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); | |
718 | skb->ip_summed = CHECKSUM_PARTIAL; | |
b3cdd2a7 JV |
719 | |
720 | if (inout) | |
0d79641a JA |
721 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
722 | (void *)ciph - (void *)iph, | |
723 | "Forwarding altered outgoing ICMPv6"); | |
b3cdd2a7 | 724 | else |
0d79641a JA |
725 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
726 | (void *)ciph - (void *)iph, | |
727 | "Forwarding altered incoming ICMPv6"); | |
b3cdd2a7 JV |
728 | } |
729 | #endif | |
730 | ||
4856c84c MT |
731 | /* Handle relevant response ICMP messages - forward to the right |
732 | * destination host. Used for NAT and local client. | |
733 | */ | |
f2428ed5 SH |
734 | static int handle_response_icmp(int af, struct sk_buff *skb, |
735 | union nf_inet_addr *snet, | |
736 | __u8 protocol, struct ip_vs_conn *cp, | |
4856c84c MT |
737 | struct ip_vs_protocol *pp, |
738 | unsigned int offset, unsigned int ihl) | |
739 | { | |
a0840e2e | 740 | struct netns_ipvs *ipvs; |
4856c84c MT |
741 | unsigned int verdict = NF_DROP; |
742 | ||
743 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
1e3e238e HE |
744 | pr_err("shouldn't reach here, because the box is on the " |
745 | "half connection in the tun/dr module.\n"); | |
4856c84c MT |
746 | } |
747 | ||
748 | /* Ensure the checksum is correct */ | |
749 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
750 | /* Failed checksum! */ | |
f2428ed5 SH |
751 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
752 | IP_VS_DBG_ADDR(af, snet)); | |
4856c84c MT |
753 | goto out; |
754 | } | |
755 | ||
2906f66a VMR |
756 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
757 | IPPROTO_SCTP == protocol) | |
4856c84c MT |
758 | offset += 2 * sizeof(__u16); |
759 | if (!skb_make_writable(skb, offset)) | |
760 | goto out; | |
761 | ||
a0840e2e HS |
762 | ipvs = net_ipvs(skb_net(skb)); |
763 | ||
f2428ed5 SH |
764 | #ifdef CONFIG_IP_VS_IPV6 |
765 | if (af == AF_INET6) | |
766 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); | |
767 | else | |
768 | #endif | |
769 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
4856c84c | 770 | |
f5a41847 JA |
771 | #ifdef CONFIG_IP_VS_IPV6 |
772 | if (af == AF_INET6) { | |
a0840e2e | 773 | if (ipvs->sysctl_snat_reroute && ip6_route_me_harder(skb) != 0) |
f5a41847 JA |
774 | goto out; |
775 | } else | |
776 | #endif | |
a0840e2e | 777 | if ((ipvs->sysctl_snat_reroute || |
f5a41847 JA |
778 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) && |
779 | ip_route_me_harder(skb, RTN_LOCAL) != 0) | |
780 | goto out; | |
781 | ||
4856c84c MT |
782 | /* do the statistics and put it back */ |
783 | ip_vs_out_stats(cp, skb); | |
784 | ||
cf356d69 | 785 | skb->ipvs_property = 1; |
f4bc17cd | 786 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 787 | ip_vs_notrack(skb); |
f4bc17cd JA |
788 | else |
789 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
790 | verdict = NF_ACCEPT; |
791 | ||
792 | out: | |
793 | __ip_vs_conn_put(cp); | |
794 | ||
795 | return verdict; | |
796 | } | |
797 | ||
1da177e4 LT |
798 | /* |
799 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
4856c84c | 800 | * Find any that might be relevant, check against existing connections. |
1da177e4 | 801 | * Currently handles error types - unreachable, quench, ttl exceeded. |
1da177e4 | 802 | */ |
1ca5bb54 JA |
803 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related, |
804 | unsigned int hooknum) | |
1da177e4 | 805 | { |
1da177e4 LT |
806 | struct iphdr *iph; |
807 | struct icmphdr _icmph, *ic; | |
808 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 809 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
810 | struct ip_vs_conn *cp; |
811 | struct ip_vs_protocol *pp; | |
4856c84c | 812 | unsigned int offset, ihl; |
f2428ed5 | 813 | union nf_inet_addr snet; |
1da177e4 LT |
814 | |
815 | *related = 1; | |
816 | ||
817 | /* reassemble IP fragments */ | |
eddc9ec5 | 818 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
1ca5bb54 | 819 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 820 | return NF_STOLEN; |
1da177e4 LT |
821 | } |
822 | ||
eddc9ec5 | 823 | iph = ip_hdr(skb); |
1da177e4 LT |
824 | offset = ihl = iph->ihl * 4; |
825 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
826 | if (ic == NULL) | |
827 | return NF_DROP; | |
828 | ||
14d5e834 | 829 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 830 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 831 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
832 | |
833 | /* | |
834 | * Work through seeing if this is for us. | |
835 | * These checks are supposed to be in an order that means easy | |
836 | * things are checked first to speed up processing.... however | |
837 | * this means that some packets will manage to get a long way | |
838 | * down this stack and then be rejected, but that's life. | |
839 | */ | |
840 | if ((ic->type != ICMP_DEST_UNREACH) && | |
841 | (ic->type != ICMP_SOURCE_QUENCH) && | |
842 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
843 | *related = 0; | |
844 | return NF_ACCEPT; | |
845 | } | |
846 | ||
847 | /* Now find the contained IP header */ | |
848 | offset += sizeof(_icmph); | |
849 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
850 | if (cih == NULL) | |
851 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
852 | ||
853 | pp = ip_vs_proto_get(cih->protocol); | |
854 | if (!pp) | |
855 | return NF_ACCEPT; | |
856 | ||
857 | /* Is the embedded protocol header present? */ | |
4412ec49 | 858 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
859 | pp->dont_defrag)) |
860 | return NF_ACCEPT; | |
861 | ||
0d79641a JA |
862 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
863 | "Checking outgoing ICMP for"); | |
1da177e4 LT |
864 | |
865 | offset += cih->ihl * 4; | |
866 | ||
51ef348b | 867 | ip_vs_fill_iphdr(AF_INET, cih, &ciph); |
1da177e4 | 868 | /* The embedded headers contain source and dest in reverse order */ |
9330419d | 869 | cp = pp->conn_out_get(AF_INET, skb, &ciph, offset, 1); |
1da177e4 LT |
870 | if (!cp) |
871 | return NF_ACCEPT; | |
872 | ||
f2428ed5 SH |
873 | snet.ip = iph->saddr; |
874 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, | |
875 | pp, offset, ihl); | |
1da177e4 LT |
876 | } |
877 | ||
2a3b791e | 878 | #ifdef CONFIG_IP_VS_IPV6 |
1ca5bb54 JA |
879 | static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, |
880 | unsigned int hooknum) | |
2a3b791e JV |
881 | { |
882 | struct ipv6hdr *iph; | |
883 | struct icmp6hdr _icmph, *ic; | |
884 | struct ipv6hdr _ciph, *cih; /* The ip header contained | |
885 | within the ICMP */ | |
886 | struct ip_vs_iphdr ciph; | |
887 | struct ip_vs_conn *cp; | |
888 | struct ip_vs_protocol *pp; | |
f2428ed5 SH |
889 | unsigned int offset; |
890 | union nf_inet_addr snet; | |
2a3b791e JV |
891 | |
892 | *related = 1; | |
893 | ||
894 | /* reassemble IP fragments */ | |
895 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
1ca5bb54 | 896 | if (ip_vs_gather_frags_v6(skb, ip_vs_defrag_user(hooknum))) |
2a3b791e JV |
897 | return NF_STOLEN; |
898 | } | |
899 | ||
900 | iph = ipv6_hdr(skb); | |
901 | offset = sizeof(struct ipv6hdr); | |
902 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
903 | if (ic == NULL) | |
904 | return NF_DROP; | |
905 | ||
5b095d98 | 906 | IP_VS_DBG(12, "Outgoing ICMPv6 (%d,%d) %pI6->%pI6\n", |
2a3b791e | 907 | ic->icmp6_type, ntohs(icmpv6_id(ic)), |
38ff4fa4 | 908 | &iph->saddr, &iph->daddr); |
2a3b791e JV |
909 | |
910 | /* | |
911 | * Work through seeing if this is for us. | |
912 | * These checks are supposed to be in an order that means easy | |
913 | * things are checked first to speed up processing.... however | |
914 | * this means that some packets will manage to get a long way | |
915 | * down this stack and then be rejected, but that's life. | |
916 | */ | |
917 | if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) && | |
918 | (ic->icmp6_type != ICMPV6_PKT_TOOBIG) && | |
919 | (ic->icmp6_type != ICMPV6_TIME_EXCEED)) { | |
920 | *related = 0; | |
921 | return NF_ACCEPT; | |
922 | } | |
923 | ||
924 | /* Now find the contained IP header */ | |
925 | offset += sizeof(_icmph); | |
926 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
927 | if (cih == NULL) | |
928 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
929 | ||
930 | pp = ip_vs_proto_get(cih->nexthdr); | |
931 | if (!pp) | |
932 | return NF_ACCEPT; | |
933 | ||
934 | /* Is the embedded protocol header present? */ | |
935 | /* TODO: we don't support fragmentation at the moment anyways */ | |
936 | if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag)) | |
937 | return NF_ACCEPT; | |
938 | ||
0d79641a JA |
939 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offset, |
940 | "Checking outgoing ICMPv6 for"); | |
2a3b791e JV |
941 | |
942 | offset += sizeof(struct ipv6hdr); | |
943 | ||
944 | ip_vs_fill_iphdr(AF_INET6, cih, &ciph); | |
945 | /* The embedded headers contain source and dest in reverse order */ | |
9330419d | 946 | cp = pp->conn_out_get(AF_INET6, skb, &ciph, offset, 1); |
2a3b791e JV |
947 | if (!cp) |
948 | return NF_ACCEPT; | |
949 | ||
178f5e49 | 950 | ipv6_addr_copy(&snet.in6, &iph->saddr); |
f2428ed5 SH |
951 | return handle_response_icmp(AF_INET6, skb, &snet, cih->nexthdr, cp, |
952 | pp, offset, sizeof(struct ipv6hdr)); | |
2a3b791e JV |
953 | } |
954 | #endif | |
955 | ||
2906f66a VMR |
956 | /* |
957 | * Check if sctp chunc is ABORT chunk | |
958 | */ | |
959 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) | |
960 | { | |
961 | sctp_chunkhdr_t *sch, schunk; | |
962 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), | |
963 | sizeof(schunk), &schunk); | |
964 | if (sch == NULL) | |
965 | return 0; | |
966 | if (sch->type == SCTP_CID_ABORT) | |
967 | return 1; | |
968 | return 0; | |
969 | } | |
970 | ||
2a3b791e | 971 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
1da177e4 LT |
972 | { |
973 | struct tcphdr _tcph, *th; | |
974 | ||
2a3b791e | 975 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
1da177e4 LT |
976 | if (th == NULL) |
977 | return 0; | |
978 | return th->rst; | |
979 | } | |
980 | ||
4856c84c MT |
981 | /* Handle response packets: rewrite addresses and send away... |
982 | * Used for NAT and local client. | |
983 | */ | |
984 | static unsigned int | |
9330419d | 985 | handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, |
4856c84c MT |
986 | struct ip_vs_conn *cp, int ihl) |
987 | { | |
9330419d | 988 | struct ip_vs_protocol *pp = pd->pp; |
a0840e2e | 989 | struct netns_ipvs *ipvs; |
9330419d | 990 | |
0d79641a | 991 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet"); |
4856c84c MT |
992 | |
993 | if (!skb_make_writable(skb, ihl)) | |
994 | goto drop; | |
995 | ||
996 | /* mangle the packet */ | |
997 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp)) | |
998 | goto drop; | |
999 | ||
1000 | #ifdef CONFIG_IP_VS_IPV6 | |
1001 | if (af == AF_INET6) | |
1002 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; | |
1003 | else | |
1004 | #endif | |
1005 | { | |
1006 | ip_hdr(skb)->saddr = cp->vaddr.ip; | |
1007 | ip_send_check(ip_hdr(skb)); | |
1008 | } | |
1009 | ||
8a803040 JA |
1010 | /* |
1011 | * nf_iterate does not expect change in the skb->dst->dev. | |
1012 | * It looks like it is not fatal to enable this code for hooks | |
1013 | * where our handlers are at the end of the chain list and | |
1014 | * when all next handlers use skb->dst->dev and not outdev. | |
1015 | * It will definitely route properly the inout NAT traffic | |
1016 | * when multiple paths are used. | |
1017 | */ | |
1018 | ||
4856c84c MT |
1019 | /* For policy routing, packets originating from this |
1020 | * machine itself may be routed differently to packets | |
1021 | * passing through. We want this packet to be routed as | |
1022 | * if it came from this machine itself. So re-compute | |
1023 | * the routing information. | |
1024 | */ | |
a0840e2e HS |
1025 | ipvs = net_ipvs(skb_net(skb)); |
1026 | ||
4856c84c | 1027 | #ifdef CONFIG_IP_VS_IPV6 |
f5a41847 | 1028 | if (af == AF_INET6) { |
a0840e2e | 1029 | if (ipvs->sysctl_snat_reroute && ip6_route_me_harder(skb) != 0) |
f5a41847 JA |
1030 | goto drop; |
1031 | } else | |
4856c84c | 1032 | #endif |
a0840e2e | 1033 | if ((ipvs->sysctl_snat_reroute || |
f5a41847 JA |
1034 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) && |
1035 | ip_route_me_harder(skb, RTN_LOCAL) != 0) | |
1036 | goto drop; | |
4856c84c | 1037 | |
0d79641a | 1038 | IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT"); |
4856c84c MT |
1039 | |
1040 | ip_vs_out_stats(cp, skb); | |
9330419d | 1041 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); |
cf356d69 | 1042 | skb->ipvs_property = 1; |
f4bc17cd | 1043 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 1044 | ip_vs_notrack(skb); |
f4bc17cd JA |
1045 | else |
1046 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
1047 | ip_vs_conn_put(cp); |
1048 | ||
4856c84c MT |
1049 | LeaveFunction(11); |
1050 | return NF_ACCEPT; | |
1051 | ||
1052 | drop: | |
1053 | ip_vs_conn_put(cp); | |
1054 | kfree_skb(skb); | |
f4bc17cd | 1055 | LeaveFunction(11); |
4856c84c MT |
1056 | return NF_STOLEN; |
1057 | } | |
1058 | ||
1da177e4 | 1059 | /* |
4856c84c | 1060 | * Check if outgoing packet belongs to the established ip_vs_conn. |
1da177e4 LT |
1061 | */ |
1062 | static unsigned int | |
fc604767 | 1063 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1064 | { |
fc723250 | 1065 | struct net *net = NULL; |
51ef348b | 1066 | struct ip_vs_iphdr iph; |
1da177e4 | 1067 | struct ip_vs_protocol *pp; |
9330419d | 1068 | struct ip_vs_proto_data *pd; |
1da177e4 | 1069 | struct ip_vs_conn *cp; |
a0840e2e | 1070 | struct netns_ipvs *ipvs; |
1da177e4 LT |
1071 | |
1072 | EnterFunction(11); | |
1073 | ||
fc604767 | 1074 | /* Already marked as IPVS request or reply? */ |
6869c4d8 | 1075 | if (skb->ipvs_property) |
1da177e4 LT |
1076 | return NF_ACCEPT; |
1077 | ||
fc604767 JA |
1078 | /* Bad... Do not break raw sockets */ |
1079 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1080 | af == AF_INET)) { | |
1081 | struct sock *sk = skb->sk; | |
1082 | struct inet_sock *inet = inet_sk(skb->sk); | |
1083 | ||
1084 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1085 | return NF_ACCEPT; | |
1086 | } | |
1087 | ||
1088 | if (unlikely(!skb_dst(skb))) | |
1089 | return NF_ACCEPT; | |
1090 | ||
fc723250 | 1091 | net = skb_net(skb); |
2a3b791e JV |
1092 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
1093 | #ifdef CONFIG_IP_VS_IPV6 | |
1094 | if (af == AF_INET6) { | |
1095 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1ca5bb54 JA |
1096 | int related; |
1097 | int verdict = ip_vs_out_icmp_v6(skb, &related, | |
1098 | hooknum); | |
1da177e4 | 1099 | |
f5a41847 | 1100 | if (related) |
2a3b791e JV |
1101 | return verdict; |
1102 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1103 | } | |
1104 | } else | |
1105 | #endif | |
1106 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 JA |
1107 | int related; |
1108 | int verdict = ip_vs_out_icmp(skb, &related, hooknum); | |
2a3b791e | 1109 | |
f5a41847 | 1110 | if (related) |
2a3b791e JV |
1111 | return verdict; |
1112 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1113 | } | |
1da177e4 | 1114 | |
9330419d HS |
1115 | pd = ip_vs_proto_data_get(net, iph.protocol); |
1116 | if (unlikely(!pd)) | |
1da177e4 | 1117 | return NF_ACCEPT; |
9330419d | 1118 | pp = pd->pp; |
1da177e4 LT |
1119 | |
1120 | /* reassemble IP fragments */ | |
2a3b791e JV |
1121 | #ifdef CONFIG_IP_VS_IPV6 |
1122 | if (af == AF_INET6) { | |
1ca5bb54 JA |
1123 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { |
1124 | if (ip_vs_gather_frags_v6(skb, | |
1125 | ip_vs_defrag_user(hooknum))) | |
1126 | return NF_STOLEN; | |
2a3b791e | 1127 | } |
1ca5bb54 JA |
1128 | |
1129 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
2a3b791e JV |
1130 | } else |
1131 | #endif | |
1132 | if (unlikely(ip_hdr(skb)->frag_off & htons(IP_MF|IP_OFFSET) && | |
1133 | !pp->dont_defrag)) { | |
1ca5bb54 JA |
1134 | if (ip_vs_gather_frags(skb, |
1135 | ip_vs_defrag_user(hooknum))) | |
2a3b791e JV |
1136 | return NF_STOLEN; |
1137 | ||
1138 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1139 | } | |
1da177e4 LT |
1140 | |
1141 | /* | |
1142 | * Check if the packet belongs to an existing entry | |
1143 | */ | |
9330419d | 1144 | cp = pp->conn_out_get(af, skb, &iph, iph.len, 0); |
a0840e2e | 1145 | ipvs = net_ipvs(net); |
1da177e4 | 1146 | |
cb59155f | 1147 | if (likely(cp)) |
9330419d | 1148 | return handle_response(af, skb, pd, cp, iph.len); |
a0840e2e | 1149 | if (ipvs->sysctl_nat_icmp_send && |
cb59155f JA |
1150 | (pp->protocol == IPPROTO_TCP || |
1151 | pp->protocol == IPPROTO_UDP || | |
1152 | pp->protocol == IPPROTO_SCTP)) { | |
1153 | __be16 _ports[2], *pptr; | |
1154 | ||
1155 | pptr = skb_header_pointer(skb, iph.len, | |
1156 | sizeof(_ports), _ports); | |
1157 | if (pptr == NULL) | |
1158 | return NF_ACCEPT; /* Not for me */ | |
fc723250 | 1159 | if (ip_vs_lookup_real_service(net, af, iph.protocol, |
cb59155f JA |
1160 | &iph.saddr, |
1161 | pptr[0])) { | |
1162 | /* | |
1163 | * Notify the real server: there is no | |
1164 | * existing entry if it is not RST | |
1165 | * packet or not TCP packet. | |
1166 | */ | |
1167 | if ((iph.protocol != IPPROTO_TCP && | |
1168 | iph.protocol != IPPROTO_SCTP) | |
1169 | || ((iph.protocol == IPPROTO_TCP | |
1170 | && !is_tcp_reset(skb, iph.len)) | |
1171 | || (iph.protocol == IPPROTO_SCTP | |
1172 | && !is_sctp_abort(skb, | |
1173 | iph.len)))) { | |
2a3b791e | 1174 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f JA |
1175 | if (af == AF_INET6) { |
1176 | struct net *net = | |
1177 | dev_net(skb_dst(skb)->dev); | |
1178 | ||
1179 | if (!skb->dev) | |
1180 | skb->dev = net->loopback_dev; | |
1181 | icmpv6_send(skb, | |
1182 | ICMPV6_DEST_UNREACH, | |
1183 | ICMPV6_PORT_UNREACH, | |
1184 | 0); | |
1185 | } else | |
2a3b791e | 1186 | #endif |
cb59155f JA |
1187 | icmp_send(skb, |
1188 | ICMP_DEST_UNREACH, | |
1189 | ICMP_PORT_UNREACH, 0); | |
1190 | return NF_DROP; | |
1da177e4 LT |
1191 | } |
1192 | } | |
1da177e4 | 1193 | } |
0d79641a | 1194 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
cb59155f JA |
1195 | "ip_vs_out: packet continues traversal as normal"); |
1196 | return NF_ACCEPT; | |
1da177e4 LT |
1197 | } |
1198 | ||
fc604767 | 1199 | /* |
cb59155f JA |
1200 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1201 | * used only for VS/NAT. | |
fc604767 JA |
1202 | * Check if packet is reply for established ip_vs_conn. |
1203 | */ | |
1204 | static unsigned int | |
1205 | ip_vs_reply4(unsigned int hooknum, struct sk_buff *skb, | |
1206 | const struct net_device *in, const struct net_device *out, | |
1207 | int (*okfn)(struct sk_buff *)) | |
1208 | { | |
1209 | return ip_vs_out(hooknum, skb, AF_INET); | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1214 | * Check if packet is reply for established ip_vs_conn. | |
1215 | */ | |
1216 | static unsigned int | |
1217 | ip_vs_local_reply4(unsigned int hooknum, struct sk_buff *skb, | |
1218 | const struct net_device *in, const struct net_device *out, | |
1219 | int (*okfn)(struct sk_buff *)) | |
1220 | { | |
1221 | unsigned int verdict; | |
1222 | ||
1223 | /* Disable BH in LOCAL_OUT until all places are fixed */ | |
1224 | local_bh_disable(); | |
1225 | verdict = ip_vs_out(hooknum, skb, AF_INET); | |
1226 | local_bh_enable(); | |
1227 | return verdict; | |
1228 | } | |
1229 | ||
1230 | #ifdef CONFIG_IP_VS_IPV6 | |
1231 | ||
1232 | /* | |
cb59155f JA |
1233 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1234 | * used only for VS/NAT. | |
fc604767 JA |
1235 | * Check if packet is reply for established ip_vs_conn. |
1236 | */ | |
1237 | static unsigned int | |
1238 | ip_vs_reply6(unsigned int hooknum, struct sk_buff *skb, | |
1239 | const struct net_device *in, const struct net_device *out, | |
1240 | int (*okfn)(struct sk_buff *)) | |
1241 | { | |
1242 | return ip_vs_out(hooknum, skb, AF_INET6); | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1247 | * Check if packet is reply for established ip_vs_conn. | |
1248 | */ | |
1249 | static unsigned int | |
1250 | ip_vs_local_reply6(unsigned int hooknum, struct sk_buff *skb, | |
1251 | const struct net_device *in, const struct net_device *out, | |
1252 | int (*okfn)(struct sk_buff *)) | |
1253 | { | |
1254 | unsigned int verdict; | |
1255 | ||
1256 | /* Disable BH in LOCAL_OUT until all places are fixed */ | |
1257 | local_bh_disable(); | |
1258 | verdict = ip_vs_out(hooknum, skb, AF_INET6); | |
1259 | local_bh_enable(); | |
1260 | return verdict; | |
1261 | } | |
1262 | ||
1263 | #endif | |
1da177e4 LT |
1264 | |
1265 | /* | |
1266 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
1267 | * Find any that might be relevant, check against existing connections, | |
1268 | * forward to the right destination host if relevant. | |
1269 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
1270 | */ | |
e905a9ed | 1271 | static int |
3db05fea | 1272 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
1da177e4 | 1273 | { |
9330419d | 1274 | struct net *net = NULL; |
1da177e4 LT |
1275 | struct iphdr *iph; |
1276 | struct icmphdr _icmph, *ic; | |
1277 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 1278 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
1279 | struct ip_vs_conn *cp; |
1280 | struct ip_vs_protocol *pp; | |
9330419d | 1281 | struct ip_vs_proto_data *pd; |
1da177e4 | 1282 | unsigned int offset, ihl, verdict; |
f2428ed5 | 1283 | union nf_inet_addr snet; |
1da177e4 LT |
1284 | |
1285 | *related = 1; | |
1286 | ||
1287 | /* reassemble IP fragments */ | |
eddc9ec5 | 1288 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
1ca5bb54 | 1289 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 1290 | return NF_STOLEN; |
1da177e4 LT |
1291 | } |
1292 | ||
eddc9ec5 | 1293 | iph = ip_hdr(skb); |
1da177e4 LT |
1294 | offset = ihl = iph->ihl * 4; |
1295 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1296 | if (ic == NULL) | |
1297 | return NF_DROP; | |
1298 | ||
14d5e834 | 1299 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 1300 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 1301 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
1302 | |
1303 | /* | |
1304 | * Work through seeing if this is for us. | |
1305 | * These checks are supposed to be in an order that means easy | |
1306 | * things are checked first to speed up processing.... however | |
1307 | * this means that some packets will manage to get a long way | |
1308 | * down this stack and then be rejected, but that's life. | |
1309 | */ | |
1310 | if ((ic->type != ICMP_DEST_UNREACH) && | |
1311 | (ic->type != ICMP_SOURCE_QUENCH) && | |
1312 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
1313 | *related = 0; | |
1314 | return NF_ACCEPT; | |
1315 | } | |
1316 | ||
1317 | /* Now find the contained IP header */ | |
1318 | offset += sizeof(_icmph); | |
1319 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1320 | if (cih == NULL) | |
1321 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1322 | ||
9330419d HS |
1323 | net = skb_net(skb); |
1324 | pd = ip_vs_proto_data_get(net, cih->protocol); | |
1325 | if (!pd) | |
1da177e4 | 1326 | return NF_ACCEPT; |
9330419d | 1327 | pp = pd->pp; |
1da177e4 LT |
1328 | |
1329 | /* Is the embedded protocol header present? */ | |
4412ec49 | 1330 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
1331 | pp->dont_defrag)) |
1332 | return NF_ACCEPT; | |
1333 | ||
0d79641a JA |
1334 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
1335 | "Checking incoming ICMP for"); | |
1da177e4 LT |
1336 | |
1337 | offset += cih->ihl * 4; | |
1338 | ||
51ef348b | 1339 | ip_vs_fill_iphdr(AF_INET, cih, &ciph); |
1da177e4 | 1340 | /* The embedded headers contain source and dest in reverse order */ |
9330419d | 1341 | cp = pp->conn_in_get(AF_INET, skb, &ciph, offset, 1); |
4856c84c MT |
1342 | if (!cp) { |
1343 | /* The packet could also belong to a local client */ | |
9330419d | 1344 | cp = pp->conn_out_get(AF_INET, skb, &ciph, offset, 1); |
f2428ed5 SH |
1345 | if (cp) { |
1346 | snet.ip = iph->saddr; | |
1347 | return handle_response_icmp(AF_INET, skb, &snet, | |
1348 | cih->protocol, cp, pp, | |
4856c84c | 1349 | offset, ihl); |
f2428ed5 | 1350 | } |
1da177e4 | 1351 | return NF_ACCEPT; |
4856c84c | 1352 | } |
1da177e4 LT |
1353 | |
1354 | verdict = NF_DROP; | |
1355 | ||
1356 | /* Ensure the checksum is correct */ | |
60476372 | 1357 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 | 1358 | /* Failed checksum! */ |
14d5e834 HH |
1359 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
1360 | &iph->saddr); | |
1da177e4 LT |
1361 | goto out; |
1362 | } | |
1363 | ||
1364 | /* do the statistics and put it back */ | |
1365 | ip_vs_in_stats(cp, skb); | |
1366 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) | |
1367 | offset += 2 * sizeof(__u16); | |
1368 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset); | |
489fdeda JA |
1369 | /* LOCALNODE from FORWARD hook is not supported */ |
1370 | if (verdict == NF_ACCEPT && hooknum == NF_INET_FORWARD && | |
1371 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) { | |
1372 | IP_VS_DBG(1, "%s(): " | |
1373 | "local delivery to %pI4 but in FORWARD\n", | |
1374 | __func__, &skb_rtable(skb)->rt_dst); | |
1375 | verdict = NF_DROP; | |
1376 | } | |
1da177e4 LT |
1377 | |
1378 | out: | |
1379 | __ip_vs_conn_put(cp); | |
1380 | ||
1381 | return verdict; | |
1382 | } | |
1383 | ||
2a3b791e JV |
1384 | #ifdef CONFIG_IP_VS_IPV6 |
1385 | static int | |
1386 | ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum) | |
1387 | { | |
9330419d | 1388 | struct net *net = NULL; |
2a3b791e JV |
1389 | struct ipv6hdr *iph; |
1390 | struct icmp6hdr _icmph, *ic; | |
1391 | struct ipv6hdr _ciph, *cih; /* The ip header contained | |
1392 | within the ICMP */ | |
1393 | struct ip_vs_iphdr ciph; | |
1394 | struct ip_vs_conn *cp; | |
1395 | struct ip_vs_protocol *pp; | |
9330419d | 1396 | struct ip_vs_proto_data *pd; |
2a3b791e | 1397 | unsigned int offset, verdict; |
f2428ed5 | 1398 | union nf_inet_addr snet; |
489fdeda | 1399 | struct rt6_info *rt; |
2a3b791e JV |
1400 | |
1401 | *related = 1; | |
1402 | ||
1403 | /* reassemble IP fragments */ | |
1404 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
1ca5bb54 | 1405 | if (ip_vs_gather_frags_v6(skb, ip_vs_defrag_user(hooknum))) |
2a3b791e JV |
1406 | return NF_STOLEN; |
1407 | } | |
1408 | ||
1409 | iph = ipv6_hdr(skb); | |
1410 | offset = sizeof(struct ipv6hdr); | |
1411 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1412 | if (ic == NULL) | |
1413 | return NF_DROP; | |
1414 | ||
5b095d98 | 1415 | IP_VS_DBG(12, "Incoming ICMPv6 (%d,%d) %pI6->%pI6\n", |
2a3b791e | 1416 | ic->icmp6_type, ntohs(icmpv6_id(ic)), |
38ff4fa4 | 1417 | &iph->saddr, &iph->daddr); |
2a3b791e JV |
1418 | |
1419 | /* | |
1420 | * Work through seeing if this is for us. | |
1421 | * These checks are supposed to be in an order that means easy | |
1422 | * things are checked first to speed up processing.... however | |
1423 | * this means that some packets will manage to get a long way | |
1424 | * down this stack and then be rejected, but that's life. | |
1425 | */ | |
1426 | if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) && | |
1427 | (ic->icmp6_type != ICMPV6_PKT_TOOBIG) && | |
1428 | (ic->icmp6_type != ICMPV6_TIME_EXCEED)) { | |
1429 | *related = 0; | |
1430 | return NF_ACCEPT; | |
1431 | } | |
1432 | ||
1433 | /* Now find the contained IP header */ | |
1434 | offset += sizeof(_icmph); | |
1435 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1436 | if (cih == NULL) | |
1437 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1438 | ||
9330419d HS |
1439 | net = skb_net(skb); |
1440 | pd = ip_vs_proto_data_get(net, cih->nexthdr); | |
1441 | if (!pd) | |
2a3b791e | 1442 | return NF_ACCEPT; |
9330419d | 1443 | pp = pd->pp; |
2a3b791e JV |
1444 | |
1445 | /* Is the embedded protocol header present? */ | |
1446 | /* TODO: we don't support fragmentation at the moment anyways */ | |
1447 | if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag)) | |
1448 | return NF_ACCEPT; | |
1449 | ||
0d79641a JA |
1450 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offset, |
1451 | "Checking incoming ICMPv6 for"); | |
2a3b791e JV |
1452 | |
1453 | offset += sizeof(struct ipv6hdr); | |
1454 | ||
1455 | ip_vs_fill_iphdr(AF_INET6, cih, &ciph); | |
1456 | /* The embedded headers contain source and dest in reverse order */ | |
9330419d | 1457 | cp = pp->conn_in_get(AF_INET6, skb, &ciph, offset, 1); |
f2428ed5 SH |
1458 | if (!cp) { |
1459 | /* The packet could also belong to a local client */ | |
9330419d | 1460 | cp = pp->conn_out_get(AF_INET6, skb, &ciph, offset, 1); |
f2428ed5 | 1461 | if (cp) { |
178f5e49 | 1462 | ipv6_addr_copy(&snet.in6, &iph->saddr); |
f2428ed5 SH |
1463 | return handle_response_icmp(AF_INET6, skb, &snet, |
1464 | cih->nexthdr, | |
1465 | cp, pp, offset, | |
1466 | sizeof(struct ipv6hdr)); | |
1467 | } | |
2a3b791e | 1468 | return NF_ACCEPT; |
f2428ed5 | 1469 | } |
2a3b791e JV |
1470 | |
1471 | verdict = NF_DROP; | |
1472 | ||
1473 | /* do the statistics and put it back */ | |
1474 | ip_vs_in_stats(cp, skb); | |
2906f66a VMR |
1475 | if (IPPROTO_TCP == cih->nexthdr || IPPROTO_UDP == cih->nexthdr || |
1476 | IPPROTO_SCTP == cih->nexthdr) | |
2a3b791e JV |
1477 | offset += 2 * sizeof(__u16); |
1478 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset); | |
489fdeda JA |
1479 | /* LOCALNODE from FORWARD hook is not supported */ |
1480 | if (verdict == NF_ACCEPT && hooknum == NF_INET_FORWARD && | |
1481 | (rt = (struct rt6_info *) skb_dst(skb)) && | |
1482 | rt->rt6i_dev && rt->rt6i_dev->flags & IFF_LOOPBACK) { | |
1483 | IP_VS_DBG(1, "%s(): " | |
1484 | "local delivery to %pI6 but in FORWARD\n", | |
1485 | __func__, &rt->rt6i_dst); | |
1486 | verdict = NF_DROP; | |
1487 | } | |
2a3b791e JV |
1488 | |
1489 | __ip_vs_conn_put(cp); | |
1490 | ||
1491 | return verdict; | |
1492 | } | |
1493 | #endif | |
1494 | ||
1495 | ||
1da177e4 LT |
1496 | /* |
1497 | * Check if it's for virtual services, look it up, | |
1498 | * and send it on its way... | |
1499 | */ | |
1500 | static unsigned int | |
cb59155f | 1501 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1502 | { |
f131315f | 1503 | struct net *net; |
51ef348b | 1504 | struct ip_vs_iphdr iph; |
1da177e4 | 1505 | struct ip_vs_protocol *pp; |
9330419d | 1506 | struct ip_vs_proto_data *pd; |
1da177e4 | 1507 | struct ip_vs_conn *cp; |
cb59155f | 1508 | int ret, restart, pkts; |
f131315f | 1509 | struct netns_ipvs *ipvs; |
2a3b791e | 1510 | |
fc604767 JA |
1511 | /* Already marked as IPVS request or reply? */ |
1512 | if (skb->ipvs_property) | |
1513 | return NF_ACCEPT; | |
1514 | ||
1da177e4 | 1515 | /* |
cb59155f JA |
1516 | * Big tappo: |
1517 | * - remote client: only PACKET_HOST | |
1518 | * - route: used for struct net when skb->dev is unset | |
1da177e4 | 1519 | */ |
cb59155f JA |
1520 | if (unlikely((skb->pkt_type != PACKET_HOST && |
1521 | hooknum != NF_INET_LOCAL_OUT) || | |
1522 | !skb_dst(skb))) { | |
1523 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1524 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s" | |
1525 | " ignored in hook %u\n", | |
1526 | skb->pkt_type, iph.protocol, | |
1527 | IP_VS_DBG_ADDR(af, &iph.daddr), hooknum); | |
1da177e4 LT |
1528 | return NF_ACCEPT; |
1529 | } | |
cb59155f JA |
1530 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
1531 | ||
1532 | /* Bad... Do not break raw sockets */ | |
1533 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1534 | af == AF_INET)) { | |
1535 | struct sock *sk = skb->sk; | |
1536 | struct inet_sock *inet = inet_sk(skb->sk); | |
1537 | ||
1538 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1539 | return NF_ACCEPT; | |
1540 | } | |
1da177e4 | 1541 | |
94b26551 JV |
1542 | #ifdef CONFIG_IP_VS_IPV6 |
1543 | if (af == AF_INET6) { | |
1544 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1ca5bb54 JA |
1545 | int related; |
1546 | int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum); | |
1da177e4 | 1547 | |
94b26551 JV |
1548 | if (related) |
1549 | return verdict; | |
1550 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1551 | } | |
1552 | } else | |
1553 | #endif | |
1554 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 JA |
1555 | int related; |
1556 | int verdict = ip_vs_in_icmp(skb, &related, hooknum); | |
94b26551 JV |
1557 | |
1558 | if (related) | |
1559 | return verdict; | |
1560 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1561 | } | |
1da177e4 | 1562 | |
9330419d | 1563 | net = skb_net(skb); |
1da177e4 | 1564 | /* Protocol supported? */ |
9330419d HS |
1565 | pd = ip_vs_proto_data_get(net, iph.protocol); |
1566 | if (unlikely(!pd)) | |
1da177e4 | 1567 | return NF_ACCEPT; |
9330419d | 1568 | pp = pd->pp; |
1da177e4 LT |
1569 | /* |
1570 | * Check if the packet belongs to an existing connection entry | |
1571 | */ | |
9330419d | 1572 | cp = pp->conn_in_get(af, skb, &iph, iph.len, 0); |
1da177e4 LT |
1573 | |
1574 | if (unlikely(!cp)) { | |
1575 | int v; | |
1576 | ||
9330419d | 1577 | if (!pp->conn_schedule(af, skb, pd, &v, &cp)) |
1da177e4 LT |
1578 | return v; |
1579 | } | |
1580 | ||
1581 | if (unlikely(!cp)) { | |
1582 | /* sorry, all this trouble for a no-hit :) */ | |
0d79641a | 1583 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
cb59155f | 1584 | "ip_vs_in: packet continues traversal as normal"); |
1da177e4 LT |
1585 | return NF_ACCEPT; |
1586 | } | |
1587 | ||
0d79641a | 1588 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet"); |
f131315f HS |
1589 | net = skb_net(skb); |
1590 | ipvs = net_ipvs(net); | |
1da177e4 LT |
1591 | /* Check the server status */ |
1592 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
1593 | /* the destination server is not available */ | |
1594 | ||
a0840e2e | 1595 | if (ipvs->sysctl_expire_nodest_conn) { |
1da177e4 LT |
1596 | /* try to expire the connection immediately */ |
1597 | ip_vs_conn_expire_now(cp); | |
1da177e4 | 1598 | } |
dc8103f2 JA |
1599 | /* don't restart its timer, and silently |
1600 | drop the packet. */ | |
1601 | __ip_vs_conn_put(cp); | |
1da177e4 LT |
1602 | return NF_DROP; |
1603 | } | |
1604 | ||
1605 | ip_vs_in_stats(cp, skb); | |
9330419d | 1606 | restart = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 LT |
1607 | if (cp->packet_xmit) |
1608 | ret = cp->packet_xmit(skb, cp, pp); | |
1609 | /* do not touch skb anymore */ | |
1610 | else { | |
1611 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
1612 | ret = NF_ACCEPT; | |
1613 | } | |
1614 | ||
efac5276 RB |
1615 | /* Increase its packet counter and check if it is needed |
1616 | * to be synchronized | |
1617 | * | |
1618 | * Sync connection if it is about to close to | |
1619 | * encorage the standby servers to update the connections timeout | |
986a0757 HS |
1620 | * |
1621 | * For ONE_PKT let ip_vs_sync_conn() do the filter work. | |
efac5276 | 1622 | */ |
f131315f | 1623 | |
986a0757 | 1624 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
a0840e2e | 1625 | pkts = ipvs->sysctl_sync_threshold[0]; |
986a0757 HS |
1626 | else |
1627 | pkts = atomic_add_return(1, &cp->in_pkts); | |
1628 | ||
f131315f | 1629 | if ((ipvs->sync_state & IP_VS_STATE_MASTER) && |
2906f66a VMR |
1630 | cp->protocol == IPPROTO_SCTP) { |
1631 | if ((cp->state == IP_VS_SCTP_S_ESTABLISHED && | |
a0840e2e HS |
1632 | (pkts % ipvs->sysctl_sync_threshold[1] |
1633 | == ipvs->sysctl_sync_threshold[0])) || | |
2906f66a VMR |
1634 | (cp->old_state != cp->state && |
1635 | ((cp->state == IP_VS_SCTP_S_CLOSED) || | |
1636 | (cp->state == IP_VS_SCTP_S_SHUT_ACK_CLI) || | |
1637 | (cp->state == IP_VS_SCTP_S_SHUT_ACK_SER)))) { | |
f131315f | 1638 | ip_vs_sync_conn(net, cp); |
2906f66a VMR |
1639 | goto out; |
1640 | } | |
1641 | } | |
1642 | ||
8ed2163f | 1643 | /* Keep this block last: TCP and others with pp->num_states <= 1 */ |
f131315f | 1644 | else if ((ipvs->sync_state & IP_VS_STATE_MASTER) && |
efac5276 RB |
1645 | (((cp->protocol != IPPROTO_TCP || |
1646 | cp->state == IP_VS_TCP_S_ESTABLISHED) && | |
a0840e2e HS |
1647 | (pkts % ipvs->sysctl_sync_threshold[1] |
1648 | == ipvs->sysctl_sync_threshold[0])) || | |
efac5276 RB |
1649 | ((cp->protocol == IPPROTO_TCP) && (cp->old_state != cp->state) && |
1650 | ((cp->state == IP_VS_TCP_S_FIN_WAIT) || | |
9abfe315 | 1651 | (cp->state == IP_VS_TCP_S_CLOSE) || |
9d3a0de7 RB |
1652 | (cp->state == IP_VS_TCP_S_CLOSE_WAIT) || |
1653 | (cp->state == IP_VS_TCP_S_TIME_WAIT))))) | |
f131315f | 1654 | ip_vs_sync_conn(net, cp); |
2906f66a | 1655 | out: |
efac5276 | 1656 | cp->old_state = cp->state; |
1da177e4 LT |
1657 | |
1658 | ip_vs_conn_put(cp); | |
1659 | return ret; | |
1660 | } | |
1661 | ||
cb59155f JA |
1662 | /* |
1663 | * AF_INET handler in NF_INET_LOCAL_IN chain | |
1664 | * Schedule and forward packets from remote clients | |
1665 | */ | |
1666 | static unsigned int | |
1667 | ip_vs_remote_request4(unsigned int hooknum, struct sk_buff *skb, | |
1668 | const struct net_device *in, | |
1669 | const struct net_device *out, | |
1670 | int (*okfn)(struct sk_buff *)) | |
1671 | { | |
1672 | return ip_vs_in(hooknum, skb, AF_INET); | |
1673 | } | |
1674 | ||
1675 | /* | |
1676 | * AF_INET handler in NF_INET_LOCAL_OUT chain | |
1677 | * Schedule and forward packets from local clients | |
1678 | */ | |
1679 | static unsigned int | |
1680 | ip_vs_local_request4(unsigned int hooknum, struct sk_buff *skb, | |
1681 | const struct net_device *in, const struct net_device *out, | |
1682 | int (*okfn)(struct sk_buff *)) | |
1683 | { | |
1684 | unsigned int verdict; | |
1685 | ||
1686 | /* Disable BH in LOCAL_OUT until all places are fixed */ | |
1687 | local_bh_disable(); | |
1688 | verdict = ip_vs_in(hooknum, skb, AF_INET); | |
1689 | local_bh_enable(); | |
1690 | return verdict; | |
1691 | } | |
1692 | ||
1693 | #ifdef CONFIG_IP_VS_IPV6 | |
1694 | ||
1695 | /* | |
1696 | * AF_INET6 handler in NF_INET_LOCAL_IN chain | |
1697 | * Schedule and forward packets from remote clients | |
1698 | */ | |
1699 | static unsigned int | |
1700 | ip_vs_remote_request6(unsigned int hooknum, struct sk_buff *skb, | |
1701 | const struct net_device *in, | |
1702 | const struct net_device *out, | |
1703 | int (*okfn)(struct sk_buff *)) | |
1704 | { | |
1705 | return ip_vs_in(hooknum, skb, AF_INET6); | |
1706 | } | |
1707 | ||
1708 | /* | |
1709 | * AF_INET6 handler in NF_INET_LOCAL_OUT chain | |
1710 | * Schedule and forward packets from local clients | |
1711 | */ | |
1712 | static unsigned int | |
1713 | ip_vs_local_request6(unsigned int hooknum, struct sk_buff *skb, | |
1714 | const struct net_device *in, const struct net_device *out, | |
1715 | int (*okfn)(struct sk_buff *)) | |
1716 | { | |
1717 | unsigned int verdict; | |
1718 | ||
1719 | /* Disable BH in LOCAL_OUT until all places are fixed */ | |
1720 | local_bh_disable(); | |
1721 | verdict = ip_vs_in(hooknum, skb, AF_INET6); | |
1722 | local_bh_enable(); | |
1723 | return verdict; | |
1724 | } | |
1725 | ||
1726 | #endif | |
1727 | ||
1da177e4 LT |
1728 | |
1729 | /* | |
6e23ae2a | 1730 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
1da177e4 LT |
1731 | * related packets destined for 0.0.0.0/0. |
1732 | * When fwmark-based virtual service is used, such as transparent | |
1733 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1734 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
6e23ae2a | 1735 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
1da177e4 LT |
1736 | * and send them to ip_vs_in_icmp. |
1737 | */ | |
1738 | static unsigned int | |
3db05fea | 1739 | ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
1740 | const struct net_device *in, const struct net_device *out, |
1741 | int (*okfn)(struct sk_buff *)) | |
1742 | { | |
1743 | int r; | |
1744 | ||
3db05fea | 1745 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
1da177e4 LT |
1746 | return NF_ACCEPT; |
1747 | ||
3db05fea | 1748 | return ip_vs_in_icmp(skb, &r, hooknum); |
1da177e4 LT |
1749 | } |
1750 | ||
2a3b791e JV |
1751 | #ifdef CONFIG_IP_VS_IPV6 |
1752 | static unsigned int | |
1753 | ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb, | |
1754 | const struct net_device *in, const struct net_device *out, | |
1755 | int (*okfn)(struct sk_buff *)) | |
1756 | { | |
1757 | int r; | |
1758 | ||
1759 | if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6) | |
1760 | return NF_ACCEPT; | |
1761 | ||
1762 | return ip_vs_in_icmp_v6(skb, &r, hooknum); | |
1763 | } | |
1764 | #endif | |
1765 | ||
1da177e4 | 1766 | |
1999414a | 1767 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
cb59155f JA |
1768 | /* After packet filtering, change source only for VS/NAT */ |
1769 | { | |
1770 | .hook = ip_vs_reply4, | |
1771 | .owner = THIS_MODULE, | |
1772 | .pf = PF_INET, | |
1773 | .hooknum = NF_INET_LOCAL_IN, | |
1774 | .priority = 99, | |
1775 | }, | |
41c5b317 PM |
1776 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1777 | * or VS/NAT(change destination), so that filtering rules can be | |
1778 | * applied to IPVS. */ | |
1779 | { | |
cb59155f | 1780 | .hook = ip_vs_remote_request4, |
41c5b317 PM |
1781 | .owner = THIS_MODULE, |
1782 | .pf = PF_INET, | |
cb59155f JA |
1783 | .hooknum = NF_INET_LOCAL_IN, |
1784 | .priority = 101, | |
41c5b317 | 1785 | }, |
fc604767 | 1786 | /* Before ip_vs_in, change source only for VS/NAT */ |
41c5b317 | 1787 | { |
fc604767 | 1788 | .hook = ip_vs_local_reply4, |
41c5b317 PM |
1789 | .owner = THIS_MODULE, |
1790 | .pf = PF_INET, | |
fc604767 JA |
1791 | .hooknum = NF_INET_LOCAL_OUT, |
1792 | .priority = -99, | |
41c5b317 | 1793 | }, |
cb59155f JA |
1794 | /* After mangle, schedule and forward local requests */ |
1795 | { | |
1796 | .hook = ip_vs_local_request4, | |
1797 | .owner = THIS_MODULE, | |
1798 | .pf = PF_INET, | |
1799 | .hooknum = NF_INET_LOCAL_OUT, | |
1800 | .priority = -98, | |
1801 | }, | |
41c5b317 PM |
1802 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1803 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1804 | { | |
1805 | .hook = ip_vs_forward_icmp, | |
1806 | .owner = THIS_MODULE, | |
1807 | .pf = PF_INET, | |
cb59155f JA |
1808 | .hooknum = NF_INET_FORWARD, |
1809 | .priority = 99, | |
41c5b317 | 1810 | }, |
fc604767 JA |
1811 | /* After packet filtering, change source only for VS/NAT */ |
1812 | { | |
1813 | .hook = ip_vs_reply4, | |
1814 | .owner = THIS_MODULE, | |
1815 | .pf = PF_INET, | |
1816 | .hooknum = NF_INET_FORWARD, | |
1817 | .priority = 100, | |
1818 | }, | |
473b23d3 | 1819 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f JA |
1820 | /* After packet filtering, change source only for VS/NAT */ |
1821 | { | |
1822 | .hook = ip_vs_reply6, | |
1823 | .owner = THIS_MODULE, | |
1824 | .pf = PF_INET6, | |
1825 | .hooknum = NF_INET_LOCAL_IN, | |
1826 | .priority = 99, | |
1827 | }, | |
473b23d3 JV |
1828 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1829 | * or VS/NAT(change destination), so that filtering rules can be | |
1830 | * applied to IPVS. */ | |
1831 | { | |
cb59155f | 1832 | .hook = ip_vs_remote_request6, |
473b23d3 JV |
1833 | .owner = THIS_MODULE, |
1834 | .pf = PF_INET6, | |
cb59155f JA |
1835 | .hooknum = NF_INET_LOCAL_IN, |
1836 | .priority = 101, | |
473b23d3 | 1837 | }, |
fc604767 | 1838 | /* Before ip_vs_in, change source only for VS/NAT */ |
473b23d3 | 1839 | { |
fc604767 | 1840 | .hook = ip_vs_local_reply6, |
473b23d3 | 1841 | .owner = THIS_MODULE, |
fc604767 JA |
1842 | .pf = PF_INET, |
1843 | .hooknum = NF_INET_LOCAL_OUT, | |
1844 | .priority = -99, | |
473b23d3 | 1845 | }, |
cb59155f JA |
1846 | /* After mangle, schedule and forward local requests */ |
1847 | { | |
1848 | .hook = ip_vs_local_request6, | |
1849 | .owner = THIS_MODULE, | |
1850 | .pf = PF_INET6, | |
1851 | .hooknum = NF_INET_LOCAL_OUT, | |
1852 | .priority = -98, | |
1853 | }, | |
473b23d3 JV |
1854 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1855 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1856 | { | |
1857 | .hook = ip_vs_forward_icmp_v6, | |
1858 | .owner = THIS_MODULE, | |
1859 | .pf = PF_INET6, | |
cb59155f JA |
1860 | .hooknum = NF_INET_FORWARD, |
1861 | .priority = 99, | |
473b23d3 | 1862 | }, |
fc604767 JA |
1863 | /* After packet filtering, change source only for VS/NAT */ |
1864 | { | |
1865 | .hook = ip_vs_reply6, | |
1866 | .owner = THIS_MODULE, | |
1867 | .pf = PF_INET6, | |
1868 | .hooknum = NF_INET_FORWARD, | |
1869 | .priority = 100, | |
1870 | }, | |
473b23d3 | 1871 | #endif |
1da177e4 | 1872 | }; |
61b1ab45 HS |
1873 | /* |
1874 | * Initialize IP Virtual Server netns mem. | |
1875 | */ | |
1876 | static int __net_init __ip_vs_init(struct net *net) | |
1877 | { | |
1878 | struct netns_ipvs *ipvs; | |
1879 | ||
61b1ab45 HS |
1880 | ipvs = net_generic(net, ip_vs_net_id); |
1881 | if (ipvs == NULL) { | |
1882 | pr_err("%s(): no memory.\n", __func__); | |
1883 | return -ENOMEM; | |
1884 | } | |
f6340ee0 | 1885 | ipvs->net = net; |
61b1ab45 HS |
1886 | /* Counters used for creating unique names */ |
1887 | ipvs->gen = atomic_read(&ipvs_netns_cnt); | |
1888 | atomic_inc(&ipvs_netns_cnt); | |
1889 | net->ipvs = ipvs; | |
1890 | printk(KERN_INFO "IPVS: Creating netns size=%lu id=%d\n", | |
1891 | sizeof(struct netns_ipvs), ipvs->gen); | |
1892 | return 0; | |
1893 | } | |
1894 | ||
1895 | static void __net_exit __ip_vs_cleanup(struct net *net) | |
1896 | { | |
9f4e1ccd | 1897 | IP_VS_DBG(10, "ipvs netns %d released\n", net_ipvs(net)->gen); |
61b1ab45 HS |
1898 | } |
1899 | ||
1900 | static struct pernet_operations ipvs_core_ops = { | |
1901 | .init = __ip_vs_init, | |
1902 | .exit = __ip_vs_cleanup, | |
1903 | .id = &ip_vs_net_id, | |
1904 | .size = sizeof(struct netns_ipvs), | |
1905 | }; | |
1da177e4 LT |
1906 | |
1907 | /* | |
1908 | * Initialize IP Virtual Server | |
1909 | */ | |
1910 | static int __init ip_vs_init(void) | |
1911 | { | |
1912 | int ret; | |
1913 | ||
61b1ab45 HS |
1914 | ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */ |
1915 | if (ret < 0) | |
1916 | return ret; | |
a919cf4b | 1917 | |
61b1ab45 | 1918 | ip_vs_estimator_init(); |
1da177e4 LT |
1919 | ret = ip_vs_control_init(); |
1920 | if (ret < 0) { | |
1e3e238e | 1921 | pr_err("can't setup control.\n"); |
a919cf4b | 1922 | goto cleanup_estimator; |
1da177e4 LT |
1923 | } |
1924 | ||
1925 | ip_vs_protocol_init(); | |
1926 | ||
1927 | ret = ip_vs_app_init(); | |
1928 | if (ret < 0) { | |
1e3e238e | 1929 | pr_err("can't setup application helper.\n"); |
1da177e4 LT |
1930 | goto cleanup_protocol; |
1931 | } | |
1932 | ||
1933 | ret = ip_vs_conn_init(); | |
1934 | if (ret < 0) { | |
1e3e238e | 1935 | pr_err("can't setup connection table.\n"); |
1da177e4 LT |
1936 | goto cleanup_app; |
1937 | } | |
1938 | ||
61b1ab45 HS |
1939 | ret = ip_vs_sync_init(); |
1940 | if (ret < 0) { | |
1941 | pr_err("can't setup sync data.\n"); | |
1942 | goto cleanup_conn; | |
1943 | } | |
1944 | ||
41c5b317 | 1945 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 | 1946 | if (ret < 0) { |
1e3e238e | 1947 | pr_err("can't register hooks.\n"); |
61b1ab45 | 1948 | goto cleanup_sync; |
1da177e4 LT |
1949 | } |
1950 | ||
1e3e238e | 1951 | pr_info("ipvs loaded.\n"); |
1da177e4 LT |
1952 | return ret; |
1953 | ||
61b1ab45 HS |
1954 | cleanup_sync: |
1955 | ip_vs_sync_cleanup(); | |
1da177e4 LT |
1956 | cleanup_conn: |
1957 | ip_vs_conn_cleanup(); | |
1958 | cleanup_app: | |
1959 | ip_vs_app_cleanup(); | |
1960 | cleanup_protocol: | |
1961 | ip_vs_protocol_cleanup(); | |
1962 | ip_vs_control_cleanup(); | |
a919cf4b SW |
1963 | cleanup_estimator: |
1964 | ip_vs_estimator_cleanup(); | |
61b1ab45 | 1965 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ |
1da177e4 LT |
1966 | return ret; |
1967 | } | |
1968 | ||
1969 | static void __exit ip_vs_cleanup(void) | |
1970 | { | |
41c5b317 | 1971 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
61b1ab45 | 1972 | ip_vs_sync_cleanup(); |
1da177e4 LT |
1973 | ip_vs_conn_cleanup(); |
1974 | ip_vs_app_cleanup(); | |
1975 | ip_vs_protocol_cleanup(); | |
1976 | ip_vs_control_cleanup(); | |
a919cf4b | 1977 | ip_vs_estimator_cleanup(); |
61b1ab45 | 1978 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ |
1e3e238e | 1979 | pr_info("ipvs unloaded.\n"); |
1da177e4 LT |
1980 | } |
1981 | ||
1982 | module_init(ip_vs_init); | |
1983 | module_exit(ip_vs_cleanup); | |
1984 | MODULE_LICENSE("GPL"); |