Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPVS An implementation of the IP virtual server support for the | |
3 | * LINUX operating system. IPVS is now implemented as a module | |
4 | * over the Netfilter framework. IPVS can be used to build a | |
5 | * high-performance and highly available server based on a | |
6 | * cluster of servers. | |
7 | * | |
1da177e4 LT |
8 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
9 | * Peter Kese <peter.kese@ijs.si> | |
10 | * Julian Anastasov <ja@ssi.bg> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | * | |
17 | * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, | |
18 | * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms | |
19 | * and others. | |
20 | * | |
21 | * Changes: | |
22 | * Paul `Rusty' Russell properly handle non-linear skbs | |
6869c4d8 | 23 | * Harald Welte don't use nfcache |
1da177e4 LT |
24 | * |
25 | */ | |
26 | ||
9aada7ac HE |
27 | #define KMSG_COMPONENT "IPVS" |
28 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/kernel.h> | |
32 | #include <linux/ip.h> | |
33 | #include <linux/tcp.h> | |
2906f66a | 34 | #include <linux/sctp.h> |
1da177e4 | 35 | #include <linux/icmp.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 LT |
37 | |
38 | #include <net/ip.h> | |
39 | #include <net/tcp.h> | |
40 | #include <net/udp.h> | |
41 | #include <net/icmp.h> /* for icmp_send */ | |
42 | #include <net/route.h> | |
2c70b519 | 43 | #include <net/ip6_checksum.h> |
61b1ab45 | 44 | #include <net/netns/generic.h> /* net_generic() */ |
1da177e4 LT |
45 | |
46 | #include <linux/netfilter.h> | |
47 | #include <linux/netfilter_ipv4.h> | |
48 | ||
2a3b791e JV |
49 | #ifdef CONFIG_IP_VS_IPV6 |
50 | #include <net/ipv6.h> | |
51 | #include <linux/netfilter_ipv6.h> | |
489fdeda | 52 | #include <net/ip6_route.h> |
2a3b791e JV |
53 | #endif |
54 | ||
1da177e4 LT |
55 | #include <net/ip_vs.h> |
56 | ||
57 | ||
58 | EXPORT_SYMBOL(register_ip_vs_scheduler); | |
59 | EXPORT_SYMBOL(unregister_ip_vs_scheduler); | |
1da177e4 LT |
60 | EXPORT_SYMBOL(ip_vs_proto_name); |
61 | EXPORT_SYMBOL(ip_vs_conn_new); | |
62 | EXPORT_SYMBOL(ip_vs_conn_in_get); | |
63 | EXPORT_SYMBOL(ip_vs_conn_out_get); | |
64 | #ifdef CONFIG_IP_VS_PROTO_TCP | |
65 | EXPORT_SYMBOL(ip_vs_tcp_conn_listen); | |
66 | #endif | |
67 | EXPORT_SYMBOL(ip_vs_conn_put); | |
68 | #ifdef CONFIG_IP_VS_DEBUG | |
69 | EXPORT_SYMBOL(ip_vs_get_debug_level); | |
70 | #endif | |
1da177e4 | 71 | |
b962abdc | 72 | static int ip_vs_net_id __read_mostly; |
61b1ab45 HS |
73 | /* netns cnt used for uniqueness */ |
74 | static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0); | |
1da177e4 LT |
75 | |
76 | /* ID used in ICMP lookups */ | |
77 | #define icmp_id(icmph) (((icmph)->un).echo.id) | |
2a3b791e | 78 | #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier) |
1da177e4 | 79 | |
95c96174 | 80 | const char *ip_vs_proto_name(unsigned int proto) |
1da177e4 LT |
81 | { |
82 | static char buf[20]; | |
83 | ||
84 | switch (proto) { | |
85 | case IPPROTO_IP: | |
86 | return "IP"; | |
87 | case IPPROTO_UDP: | |
88 | return "UDP"; | |
89 | case IPPROTO_TCP: | |
90 | return "TCP"; | |
2906f66a VMR |
91 | case IPPROTO_SCTP: |
92 | return "SCTP"; | |
1da177e4 LT |
93 | case IPPROTO_ICMP: |
94 | return "ICMP"; | |
2a3b791e JV |
95 | #ifdef CONFIG_IP_VS_IPV6 |
96 | case IPPROTO_ICMPV6: | |
97 | return "ICMPv6"; | |
98 | #endif | |
1da177e4 | 99 | default: |
1404c3ab | 100 | sprintf(buf, "IP_%u", proto); |
1da177e4 LT |
101 | return buf; |
102 | } | |
103 | } | |
104 | ||
105 | void ip_vs_init_hash_table(struct list_head *table, int rows) | |
106 | { | |
107 | while (--rows >= 0) | |
108 | INIT_LIST_HEAD(&table[rows]); | |
109 | } | |
110 | ||
111 | static inline void | |
112 | ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
113 | { | |
114 | struct ip_vs_dest *dest = cp->dest; | |
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 | 118 | struct ip_vs_cpu_stats *s; |
bcbde4c0 | 119 | struct ip_vs_service *svc; |
b17fc996 HS |
120 | |
121 | s = this_cpu_ptr(dest->stats.cpustats); | |
b17fc996 | 122 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
123 | s->cnt.inpkts++; |
124 | s->cnt.inbytes += skb->len; | |
b17fc996 HS |
125 | u64_stats_update_end(&s->syncp); |
126 | ||
bcbde4c0 JA |
127 | rcu_read_lock(); |
128 | svc = rcu_dereference(dest->svc); | |
129 | s = this_cpu_ptr(svc->stats.cpustats); | |
b17fc996 | 130 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
131 | s->cnt.inpkts++; |
132 | s->cnt.inbytes += skb->len; | |
b17fc996 | 133 | u64_stats_update_end(&s->syncp); |
bcbde4c0 | 134 | rcu_read_unlock(); |
b17fc996 | 135 | |
2a0751af | 136 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
b17fc996 | 137 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
138 | s->cnt.inpkts++; |
139 | s->cnt.inbytes += skb->len; | |
b17fc996 | 140 | u64_stats_update_end(&s->syncp); |
1da177e4 LT |
141 | } |
142 | } | |
143 | ||
144 | ||
145 | static inline void | |
146 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
147 | { | |
148 | struct ip_vs_dest *dest = cp->dest; | |
b17fc996 HS |
149 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); |
150 | ||
1da177e4 | 151 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { |
b17fc996 | 152 | struct ip_vs_cpu_stats *s; |
bcbde4c0 | 153 | struct ip_vs_service *svc; |
b17fc996 HS |
154 | |
155 | s = this_cpu_ptr(dest->stats.cpustats); | |
b17fc996 | 156 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
157 | s->cnt.outpkts++; |
158 | s->cnt.outbytes += skb->len; | |
b17fc996 HS |
159 | u64_stats_update_end(&s->syncp); |
160 | ||
bcbde4c0 JA |
161 | rcu_read_lock(); |
162 | svc = rcu_dereference(dest->svc); | |
163 | s = this_cpu_ptr(svc->stats.cpustats); | |
b17fc996 | 164 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
165 | s->cnt.outpkts++; |
166 | s->cnt.outbytes += skb->len; | |
b17fc996 | 167 | u64_stats_update_end(&s->syncp); |
bcbde4c0 | 168 | rcu_read_unlock(); |
b17fc996 | 169 | |
2a0751af | 170 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
b17fc996 | 171 | u64_stats_update_begin(&s->syncp); |
cd67cd5e JA |
172 | s->cnt.outpkts++; |
173 | s->cnt.outbytes += skb->len; | |
b17fc996 | 174 | u64_stats_update_end(&s->syncp); |
1da177e4 LT |
175 | } |
176 | } | |
177 | ||
178 | ||
179 | static inline void | |
180 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) | |
181 | { | |
b17fc996 HS |
182 | struct netns_ipvs *ipvs = net_ipvs(svc->net); |
183 | struct ip_vs_cpu_stats *s; | |
1da177e4 | 184 | |
b17fc996 | 185 | s = this_cpu_ptr(cp->dest->stats.cpustats); |
cd67cd5e JA |
186 | u64_stats_update_begin(&s->syncp); |
187 | s->cnt.conns++; | |
188 | u64_stats_update_end(&s->syncp); | |
1da177e4 | 189 | |
b17fc996 | 190 | s = this_cpu_ptr(svc->stats.cpustats); |
cd67cd5e JA |
191 | u64_stats_update_begin(&s->syncp); |
192 | s->cnt.conns++; | |
193 | u64_stats_update_end(&s->syncp); | |
b17fc996 | 194 | |
2a0751af | 195 | s = this_cpu_ptr(ipvs->tot_stats.cpustats); |
cd67cd5e JA |
196 | u64_stats_update_begin(&s->syncp); |
197 | s->cnt.conns++; | |
198 | u64_stats_update_end(&s->syncp); | |
1da177e4 LT |
199 | } |
200 | ||
201 | ||
4a516f11 | 202 | static inline void |
1da177e4 LT |
203 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, |
204 | const struct sk_buff *skb, | |
9330419d | 205 | struct ip_vs_proto_data *pd) |
1da177e4 | 206 | { |
4a516f11 SH |
207 | if (likely(pd->pp->state_transition)) |
208 | pd->pp->state_transition(cp, direction, skb, pd); | |
1da177e4 LT |
209 | } |
210 | ||
a5959d53 | 211 | static inline int |
85999283 SH |
212 | ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc, |
213 | struct sk_buff *skb, int protocol, | |
214 | const union nf_inet_addr *caddr, __be16 cport, | |
215 | const union nf_inet_addr *vaddr, __be16 vport, | |
216 | struct ip_vs_conn_param *p) | |
217 | { | |
6e67e586 HS |
218 | ip_vs_conn_fill_param(svc->net, svc->af, protocol, caddr, cport, vaddr, |
219 | vport, p); | |
ceec4c38 | 220 | p->pe = rcu_dereference(svc->pe); |
85999283 | 221 | if (p->pe && p->pe->fill_param) |
a5959d53 HS |
222 | return p->pe->fill_param(p, skb); |
223 | ||
224 | return 0; | |
85999283 | 225 | } |
1da177e4 | 226 | |
1da177e4 LT |
227 | /* |
228 | * IPVS persistent scheduling function | |
229 | * It creates a connection entry according to its template if exists, | |
230 | * or selects a server and creates a connection entry plus a template. | |
231 | * Locking: we are svc user (svc->refcnt), so we hold all dests too | |
232 | * Protocols supported: TCP, UDP | |
233 | */ | |
234 | static struct ip_vs_conn * | |
235 | ip_vs_sched_persist(struct ip_vs_service *svc, | |
d4383f04 JDB |
236 | struct sk_buff *skb, __be16 src_port, __be16 dst_port, |
237 | int *ignored, struct ip_vs_iphdr *iph) | |
1da177e4 LT |
238 | { |
239 | struct ip_vs_conn *cp = NULL; | |
1da177e4 LT |
240 | struct ip_vs_dest *dest; |
241 | struct ip_vs_conn *ct; | |
5b57a98c | 242 | __be16 dport = 0; /* destination port to forward */ |
3575792e | 243 | unsigned int flags; |
f11017ec | 244 | struct ip_vs_conn_param param; |
e0aac52e | 245 | const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) }; |
28364a59 JV |
246 | union nf_inet_addr snet; /* source network of the client, |
247 | after masking */ | |
cd17f9ed | 248 | |
1da177e4 | 249 | /* Mask saddr with the netmask to adjust template granularity */ |
cd17f9ed JV |
250 | #ifdef CONFIG_IP_VS_IPV6 |
251 | if (svc->af == AF_INET6) | |
0a925864 JA |
252 | ipv6_addr_prefix(&snet.in6, &iph->saddr.in6, |
253 | (__force __u32) svc->netmask); | |
cd17f9ed JV |
254 | else |
255 | #endif | |
d4383f04 | 256 | snet.ip = iph->saddr.ip & svc->netmask; |
1da177e4 | 257 | |
cd17f9ed JV |
258 | IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " |
259 | "mnet %s\n", | |
d4383f04 JDB |
260 | IP_VS_DBG_ADDR(svc->af, &iph->saddr), ntohs(src_port), |
261 | IP_VS_DBG_ADDR(svc->af, &iph->daddr), ntohs(dst_port), | |
cd17f9ed | 262 | IP_VS_DBG_ADDR(svc->af, &snet)); |
1da177e4 LT |
263 | |
264 | /* | |
265 | * As far as we know, FTP is a very complicated network protocol, and | |
266 | * it uses control connection and data connections. For active FTP, | |
267 | * FTP server initialize data connection to the client, its source port | |
268 | * is often 20. For passive FTP, FTP server tells the clients the port | |
269 | * that it passively listens to, and the client issues the data | |
270 | * connection. In the tunneling or direct routing mode, the load | |
271 | * balancer is on the client-to-server half of connection, the port | |
272 | * number is unknown to the load balancer. So, a conn template like | |
273 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP | |
274 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> | |
275 | * is created for other persistent services. | |
276 | */ | |
5b57a98c | 277 | { |
d4383f04 JDB |
278 | int protocol = iph->protocol; |
279 | const union nf_inet_addr *vaddr = &iph->daddr; | |
f11017ec SH |
280 | __be16 vport = 0; |
281 | ||
ce144f24 | 282 | if (dst_port == svc->port) { |
5b57a98c SH |
283 | /* non-FTP template: |
284 | * <protocol, caddr, 0, vaddr, vport, daddr, dport> | |
285 | * FTP template: | |
286 | * <protocol, caddr, 0, vaddr, 0, daddr, 0> | |
1da177e4 LT |
287 | */ |
288 | if (svc->port != FTPPORT) | |
ce144f24 | 289 | vport = dst_port; |
1da177e4 | 290 | } else { |
5b57a98c SH |
291 | /* Note: persistent fwmark-based services and |
292 | * persistent port zero service are handled here. | |
293 | * fwmark template: | |
294 | * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> | |
295 | * port zero template: | |
296 | * <protocol,caddr,0,vaddr,0,daddr,0> | |
1da177e4 | 297 | */ |
28364a59 | 298 | if (svc->fwmark) { |
5b57a98c SH |
299 | protocol = IPPROTO_IP; |
300 | vaddr = &fwmark; | |
301 | } | |
1da177e4 | 302 | } |
a5959d53 HS |
303 | /* return *ignored = -1 so NF_DROP can be used */ |
304 | if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0, | |
305 | vaddr, vport, ¶m) < 0) { | |
306 | *ignored = -1; | |
307 | return NULL; | |
308 | } | |
1da177e4 LT |
309 | } |
310 | ||
5b57a98c | 311 | /* Check if a template already exists */ |
f11017ec | 312 | ct = ip_vs_ct_in_get(¶m); |
5b57a98c | 313 | if (!ct || !ip_vs_check_template(ct)) { |
ceec4c38 JA |
314 | struct ip_vs_scheduler *sched; |
315 | ||
a5959d53 HS |
316 | /* |
317 | * No template found or the dest of the connection | |
5b57a98c | 318 | * template is not available. |
a5959d53 | 319 | * return *ignored=0 i.e. ICMP and NF_DROP |
5b57a98c | 320 | */ |
ceec4c38 | 321 | sched = rcu_dereference(svc->scheduler); |
05f00505 JA |
322 | if (sched) { |
323 | /* read svc->sched_data after svc->scheduler */ | |
324 | smp_rmb(); | |
325 | dest = sched->schedule(svc, skb, iph); | |
326 | } else { | |
327 | dest = NULL; | |
328 | } | |
5b57a98c SH |
329 | if (!dest) { |
330 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
85999283 | 331 | kfree(param.pe_data); |
a5959d53 | 332 | *ignored = 0; |
5b57a98c SH |
333 | return NULL; |
334 | } | |
335 | ||
ce144f24 | 336 | if (dst_port == svc->port && svc->port != FTPPORT) |
5b57a98c SH |
337 | dport = dest->port; |
338 | ||
85999283 SH |
339 | /* Create a template |
340 | * This adds param.pe_data to the template, | |
341 | * and thus param.pe_data will be destroyed | |
342 | * when the template expires */ | |
ba38528a | 343 | ct = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport, |
0e051e68 | 344 | IP_VS_CONN_F_TEMPLATE, dest, skb->mark); |
85999283 SH |
345 | if (ct == NULL) { |
346 | kfree(param.pe_data); | |
a5959d53 | 347 | *ignored = -1; |
5b57a98c | 348 | return NULL; |
85999283 | 349 | } |
5b57a98c SH |
350 | |
351 | ct->timeout = svc->timeout; | |
85999283 | 352 | } else { |
5b57a98c SH |
353 | /* set destination with the found template */ |
354 | dest = ct->dest; | |
85999283 SH |
355 | kfree(param.pe_data); |
356 | } | |
5b57a98c | 357 | |
ce144f24 | 358 | dport = dst_port; |
5b57a98c SH |
359 | if (dport == svc->port && dest->port) |
360 | dport = dest->port; | |
361 | ||
26ec037f | 362 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
d4383f04 | 363 | && iph->protocol == IPPROTO_UDP) ? |
26ec037f NC |
364 | IP_VS_CONN_F_ONE_PACKET : 0; |
365 | ||
1da177e4 LT |
366 | /* |
367 | * Create a new connection according to the template | |
368 | */ | |
d4383f04 JDB |
369 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, &iph->saddr, |
370 | src_port, &iph->daddr, dst_port, ¶m); | |
ce144f24 | 371 | |
ba38528a AG |
372 | cp = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport, flags, dest, |
373 | skb->mark); | |
1da177e4 LT |
374 | if (cp == NULL) { |
375 | ip_vs_conn_put(ct); | |
a5959d53 | 376 | *ignored = -1; |
1da177e4 LT |
377 | return NULL; |
378 | } | |
379 | ||
380 | /* | |
381 | * Add its control | |
382 | */ | |
383 | ip_vs_control_add(cp, ct); | |
384 | ip_vs_conn_put(ct); | |
385 | ||
386 | ip_vs_conn_stats(cp, svc); | |
387 | return cp; | |
388 | } | |
389 | ||
390 | ||
391 | /* | |
392 | * IPVS main scheduling function | |
393 | * It selects a server according to the virtual service, and | |
394 | * creates a connection entry. | |
395 | * Protocols supported: TCP, UDP | |
a5959d53 HS |
396 | * |
397 | * Usage of *ignored | |
398 | * | |
399 | * 1 : protocol tried to schedule (eg. on SYN), found svc but the | |
400 | * svc/scheduler decides that this packet should be accepted with | |
401 | * NF_ACCEPT because it must not be scheduled. | |
402 | * | |
403 | * 0 : scheduler can not find destination, so try bypass or | |
404 | * return ICMP and then NF_DROP (ip_vs_leave). | |
405 | * | |
406 | * -1 : scheduler tried to schedule but fatal error occurred, eg. | |
407 | * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param | |
408 | * failure such as missing Call-ID, ENOMEM on skb_linearize | |
409 | * or pe_data. In this case we should return NF_DROP without | |
410 | * any attempts to send ICMP with ip_vs_leave. | |
1da177e4 LT |
411 | */ |
412 | struct ip_vs_conn * | |
190ecd27 | 413 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
d4383f04 JDB |
414 | struct ip_vs_proto_data *pd, int *ignored, |
415 | struct ip_vs_iphdr *iph) | |
1da177e4 | 416 | { |
9330419d | 417 | struct ip_vs_protocol *pp = pd->pp; |
1da177e4 | 418 | struct ip_vs_conn *cp = NULL; |
ceec4c38 | 419 | struct ip_vs_scheduler *sched; |
1da177e4 | 420 | struct ip_vs_dest *dest; |
3575792e JA |
421 | __be16 _ports[2], *pptr; |
422 | unsigned int flags; | |
1da177e4 | 423 | |
190ecd27 | 424 | *ignored = 1; |
2f74713d JDB |
425 | /* |
426 | * IPv6 frags, only the first hit here. | |
427 | */ | |
d4383f04 | 428 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
1da177e4 LT |
429 | if (pptr == NULL) |
430 | return NULL; | |
431 | ||
190ecd27 JA |
432 | /* |
433 | * FTPDATA needs this check when using local real server. | |
434 | * Never schedule Active FTPDATA connections from real server. | |
435 | * For LVS-NAT they must be already created. For other methods | |
436 | * with persistence the connection is created on SYN+ACK. | |
437 | */ | |
438 | if (pptr[0] == FTPDATA) { | |
0d79641a JA |
439 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
440 | "Not scheduling FTPDATA"); | |
190ecd27 JA |
441 | return NULL; |
442 | } | |
443 | ||
444 | /* | |
a5959d53 | 445 | * Do not schedule replies from local real server. |
190ecd27 JA |
446 | */ |
447 | if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) && | |
d4383f04 | 448 | (cp = pp->conn_in_get(svc->af, skb, iph, 1))) { |
0d79641a | 449 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, |
190ecd27 JA |
450 | "Not scheduling reply for existing connection"); |
451 | __ip_vs_conn_put(cp); | |
452 | return NULL; | |
453 | } | |
454 | ||
1da177e4 LT |
455 | /* |
456 | * Persistent service | |
457 | */ | |
a5959d53 | 458 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) |
d4383f04 JDB |
459 | return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored, |
460 | iph); | |
a5959d53 HS |
461 | |
462 | *ignored = 0; | |
1da177e4 LT |
463 | |
464 | /* | |
465 | * Non-persistent service | |
466 | */ | |
467 | if (!svc->fwmark && pptr[1] != svc->port) { | |
468 | if (!svc->port) | |
1e3e238e HE |
469 | pr_err("Schedule: port zero only supported " |
470 | "in persistent services, " | |
471 | "check your ipvs configuration\n"); | |
1da177e4 LT |
472 | return NULL; |
473 | } | |
474 | ||
ceec4c38 | 475 | sched = rcu_dereference(svc->scheduler); |
05f00505 JA |
476 | if (sched) { |
477 | /* read svc->sched_data after svc->scheduler */ | |
478 | smp_rmb(); | |
479 | dest = sched->schedule(svc, skb, iph); | |
480 | } else { | |
481 | dest = NULL; | |
482 | } | |
1da177e4 LT |
483 | if (dest == NULL) { |
484 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
485 | return NULL; | |
486 | } | |
487 | ||
26ec037f | 488 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
d4383f04 | 489 | && iph->protocol == IPPROTO_UDP) ? |
26ec037f NC |
490 | IP_VS_CONN_F_ONE_PACKET : 0; |
491 | ||
1da177e4 LT |
492 | /* |
493 | * Create a connection entry. | |
494 | */ | |
f11017ec SH |
495 | { |
496 | struct ip_vs_conn_param p; | |
6e67e586 | 497 | |
d4383f04 JDB |
498 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
499 | &iph->saddr, pptr[0], &iph->daddr, | |
500 | pptr[1], &p); | |
ba38528a | 501 | cp = ip_vs_conn_new(&p, dest->af, &dest->addr, |
f11017ec | 502 | dest->port ? dest->port : pptr[1], |
0e051e68 | 503 | flags, dest, skb->mark); |
a5959d53 HS |
504 | if (!cp) { |
505 | *ignored = -1; | |
f11017ec | 506 | return NULL; |
a5959d53 | 507 | } |
f11017ec | 508 | } |
1da177e4 | 509 | |
cd17f9ed JV |
510 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
511 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", | |
512 | ip_vs_fwd_tag(cp), | |
f18ae720 JA |
513 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), |
514 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
515 | IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport), | |
cd17f9ed | 516 | cp->flags, atomic_read(&cp->refcnt)); |
1da177e4 LT |
517 | |
518 | ip_vs_conn_stats(cp, svc); | |
519 | return cp; | |
520 | } | |
521 | ||
522 | ||
523 | /* | |
524 | * Pass or drop the packet. | |
525 | * Called by ip_vs_in, when the virtual service is available but | |
526 | * no destination is available for a new connection. | |
527 | */ | |
528 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
d4383f04 | 529 | struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph) |
1da177e4 | 530 | { |
014d730d | 531 | __be16 _ports[2], *pptr; |
a7a86b86 SH |
532 | #ifdef CONFIG_SYSCTL |
533 | struct net *net; | |
534 | struct netns_ipvs *ipvs; | |
2a3b791e | 535 | int unicast; |
a7a86b86 | 536 | #endif |
9330419d | 537 | |
d4383f04 | 538 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
1da177e4 | 539 | if (pptr == NULL) { |
1da177e4 LT |
540 | return NF_DROP; |
541 | } | |
a7a86b86 SH |
542 | |
543 | #ifdef CONFIG_SYSCTL | |
4a98480b | 544 | net = skb_net(skb); |
1da177e4 | 545 | |
2a3b791e JV |
546 | #ifdef CONFIG_IP_VS_IPV6 |
547 | if (svc->af == AF_INET6) | |
d4383f04 | 548 | unicast = ipv6_addr_type(&iph->daddr.in6) & IPV6_ADDR_UNICAST; |
2a3b791e JV |
549 | else |
550 | #endif | |
d4383f04 | 551 | unicast = (inet_addr_type(net, iph->daddr.ip) == RTN_UNICAST); |
2a3b791e | 552 | |
1da177e4 | 553 | /* if it is fwmark-based service, the cache_bypass sysctl is up |
2a3b791e | 554 | and the destination is a non-local unicast, then create |
1da177e4 | 555 | a cache_bypass connection entry */ |
4a98480b | 556 | ipvs = net_ipvs(net); |
a0840e2e | 557 | if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) { |
ad542ced | 558 | int ret; |
1da177e4 | 559 | struct ip_vs_conn *cp; |
3575792e | 560 | unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && |
d4383f04 | 561 | iph->protocol == IPPROTO_UDP) ? |
3575792e | 562 | IP_VS_CONN_F_ONE_PACKET : 0; |
dff630dd | 563 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
1da177e4 | 564 | |
1da177e4 | 565 | /* create a new connection entry */ |
1e3e238e | 566 | IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); |
f11017ec SH |
567 | { |
568 | struct ip_vs_conn_param p; | |
d4383f04 JDB |
569 | ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, |
570 | &iph->saddr, pptr[0], | |
571 | &iph->daddr, pptr[1], &p); | |
ba38528a | 572 | cp = ip_vs_conn_new(&p, svc->af, &daddr, 0, |
f11017ec | 573 | IP_VS_CONN_F_BYPASS | flags, |
0e051e68 | 574 | NULL, skb->mark); |
f11017ec SH |
575 | if (!cp) |
576 | return NF_DROP; | |
577 | } | |
1da177e4 LT |
578 | |
579 | /* statistics */ | |
580 | ip_vs_in_stats(cp, skb); | |
581 | ||
582 | /* set state */ | |
4a516f11 | 583 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 LT |
584 | |
585 | /* transmit the first SYN packet */ | |
d4383f04 | 586 | ret = cp->packet_xmit(skb, cp, pd->pp, iph); |
1da177e4 LT |
587 | /* do not touch skb anymore */ |
588 | ||
589 | atomic_inc(&cp->in_pkts); | |
590 | ip_vs_conn_put(cp); | |
591 | return ret; | |
592 | } | |
a7a86b86 | 593 | #endif |
1da177e4 LT |
594 | |
595 | /* | |
596 | * When the virtual ftp service is presented, packets destined | |
597 | * for other services on the VIP may get here (except services | |
598 | * listed in the ipvs table), pass the packets, because it is | |
599 | * not ipvs job to decide to drop the packets. | |
600 | */ | |
ceec4c38 | 601 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) |
1da177e4 | 602 | return NF_ACCEPT; |
1da177e4 LT |
603 | |
604 | /* | |
605 | * Notify the client that the destination is unreachable, and | |
606 | * release the socket buffer. | |
607 | * Since it is in IP layer, the TCP socket is not actually | |
608 | * created, the TCP RST packet cannot be sent, instead that | |
609 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
610 | */ | |
2a3b791e | 611 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f JA |
612 | if (svc->af == AF_INET6) { |
613 | if (!skb->dev) { | |
9fd0fa7a | 614 | struct net *net_ = dev_net(skb_dst(skb)->dev); |
cb59155f | 615 | |
9fd0fa7a | 616 | skb->dev = net_->loopback_dev; |
cb59155f | 617 | } |
3ffe533c | 618 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
cb59155f | 619 | } else |
2a3b791e JV |
620 | #endif |
621 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
622 | ||
1da177e4 LT |
623 | return NF_DROP; |
624 | } | |
625 | ||
84b3cee3 SH |
626 | #ifdef CONFIG_SYSCTL |
627 | ||
628 | static int sysctl_snat_reroute(struct sk_buff *skb) | |
629 | { | |
630 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); | |
631 | return ipvs->sysctl_snat_reroute; | |
632 | } | |
633 | ||
0cfa558e SH |
634 | static int sysctl_nat_icmp_send(struct net *net) |
635 | { | |
636 | struct netns_ipvs *ipvs = net_ipvs(net); | |
637 | return ipvs->sysctl_nat_icmp_send; | |
638 | } | |
639 | ||
71a8ab6c SH |
640 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) |
641 | { | |
642 | return ipvs->sysctl_expire_nodest_conn; | |
643 | } | |
644 | ||
84b3cee3 SH |
645 | #else |
646 | ||
647 | static int sysctl_snat_reroute(struct sk_buff *skb) { return 0; } | |
0cfa558e | 648 | static int sysctl_nat_icmp_send(struct net *net) { return 0; } |
71a8ab6c | 649 | static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; } |
84b3cee3 SH |
650 | |
651 | #endif | |
652 | ||
b1550f22 | 653 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
1da177e4 | 654 | { |
d3bc23e7 | 655 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
1da177e4 LT |
656 | } |
657 | ||
1ca5bb54 JA |
658 | static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum) |
659 | { | |
660 | if (NF_INET_LOCAL_IN == hooknum) | |
661 | return IP_DEFRAG_VS_IN; | |
662 | if (NF_INET_FORWARD == hooknum) | |
663 | return IP_DEFRAG_VS_FWD; | |
664 | return IP_DEFRAG_VS_OUT; | |
665 | } | |
666 | ||
776c729e | 667 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
1da177e4 | 668 | { |
ac69269a | 669 | int err; |
776c729e | 670 | |
ac69269a JA |
671 | local_bh_disable(); |
672 | err = ip_defrag(skb, user); | |
673 | local_bh_enable(); | |
776c729e | 674 | if (!err) |
eddc9ec5 | 675 | ip_send_check(ip_hdr(skb)); |
776c729e HX |
676 | |
677 | return err; | |
1da177e4 LT |
678 | } |
679 | ||
579eb62a JA |
680 | static int ip_vs_route_me_harder(int af, struct sk_buff *skb, |
681 | unsigned int hooknum) | |
ba4fd7e9 | 682 | { |
579eb62a JA |
683 | if (!sysctl_snat_reroute(skb)) |
684 | return 0; | |
685 | /* Reroute replies only to remote clients (FORWARD and LOCAL_OUT) */ | |
686 | if (NF_INET_LOCAL_IN == hooknum) | |
687 | return 0; | |
ba4fd7e9 SH |
688 | #ifdef CONFIG_IP_VS_IPV6 |
689 | if (af == AF_INET6) { | |
579eb62a JA |
690 | struct dst_entry *dst = skb_dst(skb); |
691 | ||
692 | if (dst->dev && !(dst->dev->flags & IFF_LOOPBACK) && | |
693 | ip6_route_me_harder(skb) != 0) | |
ba4fd7e9 SH |
694 | return 1; |
695 | } else | |
696 | #endif | |
579eb62a | 697 | if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL) && |
ba4fd7e9 SH |
698 | ip_route_me_harder(skb, RTN_LOCAL) != 0) |
699 | return 1; | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
1da177e4 LT |
704 | /* |
705 | * Packet has been made sufficiently writable in caller | |
706 | * - inout: 1=in->out, 0=out->in | |
707 | */ | |
708 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
709 | struct ip_vs_conn *cp, int inout) | |
710 | { | |
eddc9ec5 | 711 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 712 | unsigned int icmp_offset = iph->ihl*4; |
d56f90a7 ACM |
713 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
714 | icmp_offset); | |
1da177e4 LT |
715 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
716 | ||
717 | if (inout) { | |
e7ade46a | 718 | iph->saddr = cp->vaddr.ip; |
1da177e4 | 719 | ip_send_check(iph); |
e7ade46a | 720 | ciph->daddr = cp->vaddr.ip; |
1da177e4 LT |
721 | ip_send_check(ciph); |
722 | } else { | |
e7ade46a | 723 | iph->daddr = cp->daddr.ip; |
1da177e4 | 724 | ip_send_check(iph); |
e7ade46a | 725 | ciph->saddr = cp->daddr.ip; |
1da177e4 LT |
726 | ip_send_check(ciph); |
727 | } | |
728 | ||
2906f66a VMR |
729 | /* the TCP/UDP/SCTP port */ |
730 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || | |
731 | IPPROTO_SCTP == ciph->protocol) { | |
014d730d | 732 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
1da177e4 LT |
733 | |
734 | if (inout) | |
735 | ports[1] = cp->vport; | |
736 | else | |
737 | ports[0] = cp->dport; | |
738 | } | |
739 | ||
740 | /* And finally the ICMP checksum */ | |
741 | icmph->checksum = 0; | |
742 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
743 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
744 | ||
745 | if (inout) | |
0d79641a | 746 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
747 | "Forwarding altered outgoing ICMP"); |
748 | else | |
0d79641a | 749 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, |
1da177e4 LT |
750 | "Forwarding altered incoming ICMP"); |
751 | } | |
752 | ||
b3cdd2a7 JV |
753 | #ifdef CONFIG_IP_VS_IPV6 |
754 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
755 | struct ip_vs_conn *cp, int inout) | |
756 | { | |
757 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
63dca2c0 JDB |
758 | unsigned int icmp_offset = 0; |
759 | unsigned int offs = 0; /* header offset*/ | |
760 | int protocol; | |
761 | struct icmp6hdr *icmph; | |
762 | struct ipv6hdr *ciph; | |
763 | unsigned short fragoffs; | |
764 | ||
765 | ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL); | |
766 | icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset); | |
767 | offs = icmp_offset + sizeof(struct icmp6hdr); | |
768 | ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs); | |
769 | ||
770 | protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL); | |
b3cdd2a7 JV |
771 | |
772 | if (inout) { | |
773 | iph->saddr = cp->vaddr.in6; | |
774 | ciph->daddr = cp->vaddr.in6; | |
775 | } else { | |
776 | iph->daddr = cp->daddr.in6; | |
777 | ciph->saddr = cp->daddr.in6; | |
778 | } | |
779 | ||
2906f66a | 780 | /* the TCP/UDP/SCTP port */ |
63dca2c0 JDB |
781 | if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
782 | IPPROTO_SCTP == protocol)) { | |
783 | __be16 *ports = (void *)(skb_network_header(skb) + offs); | |
b3cdd2a7 | 784 | |
63dca2c0 JDB |
785 | IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__, |
786 | ntohs(inout ? ports[1] : ports[0]), | |
787 | ntohs(inout ? cp->vport : cp->dport)); | |
b3cdd2a7 JV |
788 | if (inout) |
789 | ports[1] = cp->vport; | |
790 | else | |
791 | ports[0] = cp->dport; | |
792 | } | |
793 | ||
794 | /* And finally the ICMP checksum */ | |
8870f842 SH |
795 | icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, |
796 | skb->len - icmp_offset, | |
797 | IPPROTO_ICMPV6, 0); | |
798 | skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset; | |
799 | skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); | |
800 | skb->ip_summed = CHECKSUM_PARTIAL; | |
b3cdd2a7 JV |
801 | |
802 | if (inout) | |
0d79641a JA |
803 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
804 | (void *)ciph - (void *)iph, | |
805 | "Forwarding altered outgoing ICMPv6"); | |
b3cdd2a7 | 806 | else |
0d79641a JA |
807 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, |
808 | (void *)ciph - (void *)iph, | |
809 | "Forwarding altered incoming ICMPv6"); | |
b3cdd2a7 JV |
810 | } |
811 | #endif | |
812 | ||
4856c84c | 813 | /* Handle relevant response ICMP messages - forward to the right |
6cb90db5 | 814 | * destination host. |
4856c84c | 815 | */ |
f2428ed5 SH |
816 | static int handle_response_icmp(int af, struct sk_buff *skb, |
817 | union nf_inet_addr *snet, | |
818 | __u8 protocol, struct ip_vs_conn *cp, | |
4856c84c | 819 | struct ip_vs_protocol *pp, |
579eb62a JA |
820 | unsigned int offset, unsigned int ihl, |
821 | unsigned int hooknum) | |
4856c84c MT |
822 | { |
823 | unsigned int verdict = NF_DROP; | |
824 | ||
825 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
1e3e238e HE |
826 | pr_err("shouldn't reach here, because the box is on the " |
827 | "half connection in the tun/dr module.\n"); | |
4856c84c MT |
828 | } |
829 | ||
830 | /* Ensure the checksum is correct */ | |
831 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
832 | /* Failed checksum! */ | |
f2428ed5 SH |
833 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
834 | IP_VS_DBG_ADDR(af, snet)); | |
4856c84c MT |
835 | goto out; |
836 | } | |
837 | ||
2906f66a VMR |
838 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
839 | IPPROTO_SCTP == protocol) | |
4856c84c MT |
840 | offset += 2 * sizeof(__u16); |
841 | if (!skb_make_writable(skb, offset)) | |
842 | goto out; | |
843 | ||
f2428ed5 SH |
844 | #ifdef CONFIG_IP_VS_IPV6 |
845 | if (af == AF_INET6) | |
846 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); | |
847 | else | |
848 | #endif | |
849 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
4856c84c | 850 | |
579eb62a | 851 | if (ip_vs_route_me_harder(af, skb, hooknum)) |
ba4fd7e9 | 852 | goto out; |
f5a41847 | 853 | |
4856c84c MT |
854 | /* do the statistics and put it back */ |
855 | ip_vs_out_stats(cp, skb); | |
856 | ||
cf356d69 | 857 | skb->ipvs_property = 1; |
f4bc17cd | 858 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 859 | ip_vs_notrack(skb); |
f4bc17cd JA |
860 | else |
861 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
862 | verdict = NF_ACCEPT; |
863 | ||
864 | out: | |
865 | __ip_vs_conn_put(cp); | |
866 | ||
867 | return verdict; | |
868 | } | |
869 | ||
1da177e4 LT |
870 | /* |
871 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
4856c84c | 872 | * Find any that might be relevant, check against existing connections. |
1da177e4 | 873 | * Currently handles error types - unreachable, quench, ttl exceeded. |
1da177e4 | 874 | */ |
1ca5bb54 JA |
875 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related, |
876 | unsigned int hooknum) | |
1da177e4 | 877 | { |
1da177e4 LT |
878 | struct iphdr *iph; |
879 | struct icmphdr _icmph, *ic; | |
880 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 881 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
882 | struct ip_vs_conn *cp; |
883 | struct ip_vs_protocol *pp; | |
4856c84c | 884 | unsigned int offset, ihl; |
f2428ed5 | 885 | union nf_inet_addr snet; |
1da177e4 LT |
886 | |
887 | *related = 1; | |
888 | ||
889 | /* reassemble IP fragments */ | |
56f8a75c | 890 | if (ip_is_fragment(ip_hdr(skb))) { |
1ca5bb54 | 891 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 892 | return NF_STOLEN; |
1da177e4 LT |
893 | } |
894 | ||
eddc9ec5 | 895 | iph = ip_hdr(skb); |
1da177e4 LT |
896 | offset = ihl = iph->ihl * 4; |
897 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
898 | if (ic == NULL) | |
899 | return NF_DROP; | |
900 | ||
14d5e834 | 901 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 902 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 903 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
904 | |
905 | /* | |
906 | * Work through seeing if this is for us. | |
907 | * These checks are supposed to be in an order that means easy | |
908 | * things are checked first to speed up processing.... however | |
909 | * this means that some packets will manage to get a long way | |
910 | * down this stack and then be rejected, but that's life. | |
911 | */ | |
912 | if ((ic->type != ICMP_DEST_UNREACH) && | |
913 | (ic->type != ICMP_SOURCE_QUENCH) && | |
914 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
915 | *related = 0; | |
916 | return NF_ACCEPT; | |
917 | } | |
918 | ||
919 | /* Now find the contained IP header */ | |
920 | offset += sizeof(_icmph); | |
921 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
922 | if (cih == NULL) | |
923 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
924 | ||
925 | pp = ip_vs_proto_get(cih->protocol); | |
926 | if (!pp) | |
927 | return NF_ACCEPT; | |
928 | ||
929 | /* Is the embedded protocol header present? */ | |
4412ec49 | 930 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
931 | pp->dont_defrag)) |
932 | return NF_ACCEPT; | |
933 | ||
0d79641a JA |
934 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
935 | "Checking outgoing ICMP for"); | |
1da177e4 | 936 | |
63dca2c0 JDB |
937 | ip_vs_fill_ip4hdr(cih, &ciph); |
938 | ciph.len += offset; | |
1da177e4 | 939 | /* The embedded headers contain source and dest in reverse order */ |
d4383f04 | 940 | cp = pp->conn_out_get(AF_INET, skb, &ciph, 1); |
1da177e4 LT |
941 | if (!cp) |
942 | return NF_ACCEPT; | |
943 | ||
f2428ed5 SH |
944 | snet.ip = iph->saddr; |
945 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, | |
579eb62a | 946 | pp, ciph.len, ihl, hooknum); |
1da177e4 LT |
947 | } |
948 | ||
2a3b791e | 949 | #ifdef CONFIG_IP_VS_IPV6 |
1ca5bb54 | 950 | static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, |
d4383f04 | 951 | unsigned int hooknum, struct ip_vs_iphdr *ipvsh) |
2a3b791e | 952 | { |
2a3b791e | 953 | struct icmp6hdr _icmph, *ic; |
63dca2c0 JDB |
954 | struct ipv6hdr _ip6h, *ip6h; /* The ip header contained within ICMP */ |
955 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ | |
2a3b791e JV |
956 | struct ip_vs_conn *cp; |
957 | struct ip_vs_protocol *pp; | |
f2428ed5 | 958 | union nf_inet_addr snet; |
63dca2c0 | 959 | unsigned int writable; |
2a3b791e | 960 | |
63dca2c0 | 961 | *related = 1; |
2f74713d | 962 | ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh); |
2a3b791e JV |
963 | if (ic == NULL) |
964 | return NF_DROP; | |
965 | ||
2a3b791e JV |
966 | /* |
967 | * Work through seeing if this is for us. | |
968 | * These checks are supposed to be in an order that means easy | |
969 | * things are checked first to speed up processing.... however | |
970 | * this means that some packets will manage to get a long way | |
971 | * down this stack and then be rejected, but that's life. | |
972 | */ | |
2fab8917 | 973 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
2a3b791e JV |
974 | *related = 0; |
975 | return NF_ACCEPT; | |
976 | } | |
2f74713d JDB |
977 | /* Fragment header that is before ICMP header tells us that: |
978 | * it's not an error message since they can't be fragmented. | |
979 | */ | |
e7165030 | 980 | if (ipvsh->flags & IP6_FH_F_FRAG) |
2f74713d | 981 | return NF_DROP; |
2a3b791e | 982 | |
63dca2c0 JDB |
983 | IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
984 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
985 | &ipvsh->saddr, &ipvsh->daddr); | |
986 | ||
2a3b791e | 987 | /* Now find the contained IP header */ |
63dca2c0 JDB |
988 | ciph.len = ipvsh->len + sizeof(_icmph); |
989 | ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); | |
990 | if (ip6h == NULL) | |
2a3b791e | 991 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
63dca2c0 JDB |
992 | ciph.saddr.in6 = ip6h->saddr; /* conn_out_get() handles reverse order */ |
993 | ciph.daddr.in6 = ip6h->daddr; | |
994 | /* skip possible IPv6 exthdrs of contained IPv6 packet */ | |
995 | ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); | |
996 | if (ciph.protocol < 0) | |
997 | return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ | |
998 | ||
999 | pp = ip_vs_proto_get(ciph.protocol); | |
2a3b791e JV |
1000 | if (!pp) |
1001 | return NF_ACCEPT; | |
1002 | ||
2a3b791e | 1003 | /* The embedded headers contain source and dest in reverse order */ |
d4383f04 | 1004 | cp = pp->conn_out_get(AF_INET6, skb, &ciph, 1); |
2a3b791e JV |
1005 | if (!cp) |
1006 | return NF_ACCEPT; | |
1007 | ||
63dca2c0 JDB |
1008 | snet.in6 = ciph.saddr.in6; |
1009 | writable = ciph.len; | |
1010 | return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp, | |
579eb62a JA |
1011 | pp, writable, sizeof(struct ipv6hdr), |
1012 | hooknum); | |
2a3b791e JV |
1013 | } |
1014 | #endif | |
1015 | ||
2906f66a VMR |
1016 | /* |
1017 | * Check if sctp chunc is ABORT chunk | |
1018 | */ | |
1019 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) | |
1020 | { | |
1021 | sctp_chunkhdr_t *sch, schunk; | |
1022 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), | |
1023 | sizeof(schunk), &schunk); | |
1024 | if (sch == NULL) | |
1025 | return 0; | |
1026 | if (sch->type == SCTP_CID_ABORT) | |
1027 | return 1; | |
1028 | return 0; | |
1029 | } | |
1030 | ||
2a3b791e | 1031 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
1da177e4 LT |
1032 | { |
1033 | struct tcphdr _tcph, *th; | |
1034 | ||
2a3b791e | 1035 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
1da177e4 LT |
1036 | if (th == NULL) |
1037 | return 0; | |
1038 | return th->rst; | |
1039 | } | |
1040 | ||
dc7b3eb9 GL |
1041 | static inline bool is_new_conn(const struct sk_buff *skb, |
1042 | struct ip_vs_iphdr *iph) | |
1043 | { | |
1044 | switch (iph->protocol) { | |
1045 | case IPPROTO_TCP: { | |
1046 | struct tcphdr _tcph, *th; | |
1047 | ||
1048 | th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph); | |
1049 | if (th == NULL) | |
1050 | return false; | |
1051 | return th->syn; | |
1052 | } | |
1053 | case IPPROTO_SCTP: { | |
1054 | sctp_chunkhdr_t *sch, schunk; | |
1055 | ||
1056 | sch = skb_header_pointer(skb, iph->len + sizeof(sctp_sctphdr_t), | |
1057 | sizeof(schunk), &schunk); | |
1058 | if (sch == NULL) | |
1059 | return false; | |
1060 | return sch->type == SCTP_CID_INIT; | |
1061 | } | |
1062 | default: | |
1063 | return false; | |
1064 | } | |
1065 | } | |
1066 | ||
d752c364 MRL |
1067 | static inline bool is_new_conn_expected(const struct ip_vs_conn *cp, |
1068 | int conn_reuse_mode) | |
1069 | { | |
1070 | /* Controlled (FTP DATA or persistence)? */ | |
1071 | if (cp->control) | |
1072 | return false; | |
1073 | ||
1074 | switch (cp->protocol) { | |
1075 | case IPPROTO_TCP: | |
1076 | return (cp->state == IP_VS_TCP_S_TIME_WAIT) || | |
1077 | ((conn_reuse_mode & 2) && | |
1078 | (cp->state == IP_VS_TCP_S_FIN_WAIT) && | |
1079 | (cp->flags & IP_VS_CONN_F_NOOUTPUT)); | |
1080 | case IPPROTO_SCTP: | |
1081 | return cp->state == IP_VS_SCTP_S_CLOSED; | |
1082 | default: | |
1083 | return false; | |
1084 | } | |
1085 | } | |
1086 | ||
4856c84c | 1087 | /* Handle response packets: rewrite addresses and send away... |
4856c84c MT |
1088 | */ |
1089 | static unsigned int | |
9330419d | 1090 | handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, |
579eb62a JA |
1091 | struct ip_vs_conn *cp, struct ip_vs_iphdr *iph, |
1092 | unsigned int hooknum) | |
4856c84c | 1093 | { |
9330419d HS |
1094 | struct ip_vs_protocol *pp = pd->pp; |
1095 | ||
0d79641a | 1096 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet"); |
4856c84c | 1097 | |
d4383f04 | 1098 | if (!skb_make_writable(skb, iph->len)) |
4856c84c MT |
1099 | goto drop; |
1100 | ||
1101 | /* mangle the packet */ | |
d4383f04 | 1102 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph)) |
4856c84c MT |
1103 | goto drop; |
1104 | ||
1105 | #ifdef CONFIG_IP_VS_IPV6 | |
1106 | if (af == AF_INET6) | |
1107 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; | |
1108 | else | |
1109 | #endif | |
1110 | { | |
1111 | ip_hdr(skb)->saddr = cp->vaddr.ip; | |
1112 | ip_send_check(ip_hdr(skb)); | |
1113 | } | |
1114 | ||
8a803040 JA |
1115 | /* |
1116 | * nf_iterate does not expect change in the skb->dst->dev. | |
1117 | * It looks like it is not fatal to enable this code for hooks | |
1118 | * where our handlers are at the end of the chain list and | |
1119 | * when all next handlers use skb->dst->dev and not outdev. | |
1120 | * It will definitely route properly the inout NAT traffic | |
1121 | * when multiple paths are used. | |
1122 | */ | |
1123 | ||
4856c84c MT |
1124 | /* For policy routing, packets originating from this |
1125 | * machine itself may be routed differently to packets | |
1126 | * passing through. We want this packet to be routed as | |
1127 | * if it came from this machine itself. So re-compute | |
1128 | * the routing information. | |
1129 | */ | |
579eb62a | 1130 | if (ip_vs_route_me_harder(af, skb, hooknum)) |
ba4fd7e9 | 1131 | goto drop; |
4856c84c | 1132 | |
0d79641a | 1133 | IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT"); |
4856c84c MT |
1134 | |
1135 | ip_vs_out_stats(cp, skb); | |
9330419d | 1136 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); |
cf356d69 | 1137 | skb->ipvs_property = 1; |
f4bc17cd | 1138 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) |
cf356d69 | 1139 | ip_vs_notrack(skb); |
f4bc17cd JA |
1140 | else |
1141 | ip_vs_update_conntrack(skb, cp, 0); | |
4856c84c MT |
1142 | ip_vs_conn_put(cp); |
1143 | ||
4856c84c MT |
1144 | LeaveFunction(11); |
1145 | return NF_ACCEPT; | |
1146 | ||
1147 | drop: | |
1148 | ip_vs_conn_put(cp); | |
1149 | kfree_skb(skb); | |
f4bc17cd | 1150 | LeaveFunction(11); |
4856c84c MT |
1151 | return NF_STOLEN; |
1152 | } | |
1153 | ||
1da177e4 | 1154 | /* |
4856c84c | 1155 | * Check if outgoing packet belongs to the established ip_vs_conn. |
1da177e4 LT |
1156 | */ |
1157 | static unsigned int | |
fc604767 | 1158 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1159 | { |
fc723250 | 1160 | struct net *net = NULL; |
51ef348b | 1161 | struct ip_vs_iphdr iph; |
1da177e4 | 1162 | struct ip_vs_protocol *pp; |
9330419d | 1163 | struct ip_vs_proto_data *pd; |
1da177e4 | 1164 | struct ip_vs_conn *cp; |
1da177e4 LT |
1165 | |
1166 | EnterFunction(11); | |
1167 | ||
fc604767 | 1168 | /* Already marked as IPVS request or reply? */ |
6869c4d8 | 1169 | if (skb->ipvs_property) |
1da177e4 LT |
1170 | return NF_ACCEPT; |
1171 | ||
fc604767 JA |
1172 | /* Bad... Do not break raw sockets */ |
1173 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1174 | af == AF_INET)) { | |
1175 | struct sock *sk = skb->sk; | |
1176 | struct inet_sock *inet = inet_sk(skb->sk); | |
1177 | ||
1178 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1179 | return NF_ACCEPT; | |
1180 | } | |
1181 | ||
1182 | if (unlikely(!skb_dst(skb))) | |
1183 | return NF_ACCEPT; | |
1184 | ||
fc723250 | 1185 | net = skb_net(skb); |
7a4f0761 HS |
1186 | if (!net_ipvs(net)->enable) |
1187 | return NF_ACCEPT; | |
1188 | ||
63dca2c0 | 1189 | ip_vs_fill_iph_skb(af, skb, &iph); |
2a3b791e JV |
1190 | #ifdef CONFIG_IP_VS_IPV6 |
1191 | if (af == AF_INET6) { | |
1192 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1ca5bb54 JA |
1193 | int related; |
1194 | int verdict = ip_vs_out_icmp_v6(skb, &related, | |
d4383f04 | 1195 | hooknum, &iph); |
1da177e4 | 1196 | |
f5a41847 | 1197 | if (related) |
2a3b791e | 1198 | return verdict; |
2a3b791e JV |
1199 | } |
1200 | } else | |
1201 | #endif | |
1202 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 JA |
1203 | int related; |
1204 | int verdict = ip_vs_out_icmp(skb, &related, hooknum); | |
2a3b791e | 1205 | |
f5a41847 | 1206 | if (related) |
2a3b791e | 1207 | return verdict; |
2a3b791e | 1208 | } |
1da177e4 | 1209 | |
9330419d HS |
1210 | pd = ip_vs_proto_data_get(net, iph.protocol); |
1211 | if (unlikely(!pd)) | |
1da177e4 | 1212 | return NF_ACCEPT; |
9330419d | 1213 | pp = pd->pp; |
1da177e4 LT |
1214 | |
1215 | /* reassemble IP fragments */ | |
2a3b791e | 1216 | #ifdef CONFIG_IP_VS_IPV6 |
63dca2c0 | 1217 | if (af == AF_INET) |
2a3b791e | 1218 | #endif |
56f8a75c | 1219 | if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) { |
1ca5bb54 JA |
1220 | if (ip_vs_gather_frags(skb, |
1221 | ip_vs_defrag_user(hooknum))) | |
2a3b791e JV |
1222 | return NF_STOLEN; |
1223 | ||
63dca2c0 | 1224 | ip_vs_fill_ip4hdr(skb_network_header(skb), &iph); |
2a3b791e | 1225 | } |
1da177e4 LT |
1226 | |
1227 | /* | |
1228 | * Check if the packet belongs to an existing entry | |
1229 | */ | |
d4383f04 | 1230 | cp = pp->conn_out_get(af, skb, &iph, 0); |
1da177e4 | 1231 | |
cb59155f | 1232 | if (likely(cp)) |
579eb62a | 1233 | return handle_response(af, skb, pd, cp, &iph, hooknum); |
0cfa558e | 1234 | if (sysctl_nat_icmp_send(net) && |
cb59155f JA |
1235 | (pp->protocol == IPPROTO_TCP || |
1236 | pp->protocol == IPPROTO_UDP || | |
1237 | pp->protocol == IPPROTO_SCTP)) { | |
1238 | __be16 _ports[2], *pptr; | |
1239 | ||
2f74713d JDB |
1240 | pptr = frag_safe_skb_hp(skb, iph.len, |
1241 | sizeof(_ports), _ports, &iph); | |
cb59155f JA |
1242 | if (pptr == NULL) |
1243 | return NF_ACCEPT; /* Not for me */ | |
276472ea JA |
1244 | if (ip_vs_has_real_service(net, af, iph.protocol, &iph.saddr, |
1245 | pptr[0])) { | |
cb59155f JA |
1246 | /* |
1247 | * Notify the real server: there is no | |
1248 | * existing entry if it is not RST | |
1249 | * packet or not TCP packet. | |
1250 | */ | |
1251 | if ((iph.protocol != IPPROTO_TCP && | |
1252 | iph.protocol != IPPROTO_SCTP) | |
1253 | || ((iph.protocol == IPPROTO_TCP | |
1254 | && !is_tcp_reset(skb, iph.len)) | |
1255 | || (iph.protocol == IPPROTO_SCTP | |
1256 | && !is_sctp_abort(skb, | |
1257 | iph.len)))) { | |
2a3b791e | 1258 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f | 1259 | if (af == AF_INET6) { |
cb59155f JA |
1260 | if (!skb->dev) |
1261 | skb->dev = net->loopback_dev; | |
1262 | icmpv6_send(skb, | |
1263 | ICMPV6_DEST_UNREACH, | |
1264 | ICMPV6_PORT_UNREACH, | |
1265 | 0); | |
1266 | } else | |
2a3b791e | 1267 | #endif |
cb59155f JA |
1268 | icmp_send(skb, |
1269 | ICMP_DEST_UNREACH, | |
1270 | ICMP_PORT_UNREACH, 0); | |
1271 | return NF_DROP; | |
1da177e4 LT |
1272 | } |
1273 | } | |
1da177e4 | 1274 | } |
0d79641a | 1275 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
cb59155f JA |
1276 | "ip_vs_out: packet continues traversal as normal"); |
1277 | return NF_ACCEPT; | |
1da177e4 LT |
1278 | } |
1279 | ||
fc604767 | 1280 | /* |
cb59155f JA |
1281 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1282 | * used only for VS/NAT. | |
fc604767 JA |
1283 | * Check if packet is reply for established ip_vs_conn. |
1284 | */ | |
1285 | static unsigned int | |
795aa6ef | 1286 | ip_vs_reply4(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1287 | const struct nf_hook_state *state) |
fc604767 | 1288 | { |
795aa6ef | 1289 | return ip_vs_out(ops->hooknum, skb, AF_INET); |
fc604767 JA |
1290 | } |
1291 | ||
1292 | /* | |
1293 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1294 | * Check if packet is reply for established ip_vs_conn. | |
1295 | */ | |
1296 | static unsigned int | |
795aa6ef | 1297 | ip_vs_local_reply4(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1298 | const struct nf_hook_state *state) |
fc604767 | 1299 | { |
795aa6ef | 1300 | return ip_vs_out(ops->hooknum, skb, AF_INET); |
fc604767 JA |
1301 | } |
1302 | ||
1303 | #ifdef CONFIG_IP_VS_IPV6 | |
1304 | ||
1305 | /* | |
cb59155f JA |
1306 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, |
1307 | * used only for VS/NAT. | |
fc604767 JA |
1308 | * Check if packet is reply for established ip_vs_conn. |
1309 | */ | |
1310 | static unsigned int | |
795aa6ef | 1311 | ip_vs_reply6(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1312 | const struct nf_hook_state *state) |
fc604767 | 1313 | { |
795aa6ef | 1314 | return ip_vs_out(ops->hooknum, skb, AF_INET6); |
fc604767 JA |
1315 | } |
1316 | ||
1317 | /* | |
1318 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1319 | * Check if packet is reply for established ip_vs_conn. | |
1320 | */ | |
1321 | static unsigned int | |
795aa6ef | 1322 | ip_vs_local_reply6(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1323 | const struct nf_hook_state *state) |
fc604767 | 1324 | { |
795aa6ef | 1325 | return ip_vs_out(ops->hooknum, skb, AF_INET6); |
fc604767 JA |
1326 | } |
1327 | ||
1328 | #endif | |
1da177e4 LT |
1329 | |
1330 | /* | |
1331 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
1332 | * Find any that might be relevant, check against existing connections, | |
1333 | * forward to the right destination host if relevant. | |
1334 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
1335 | */ | |
e905a9ed | 1336 | static int |
3db05fea | 1337 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
1da177e4 | 1338 | { |
9330419d | 1339 | struct net *net = NULL; |
1da177e4 LT |
1340 | struct iphdr *iph; |
1341 | struct icmphdr _icmph, *ic; | |
1342 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 1343 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
1344 | struct ip_vs_conn *cp; |
1345 | struct ip_vs_protocol *pp; | |
9330419d | 1346 | struct ip_vs_proto_data *pd; |
f2edb9f7 JA |
1347 | unsigned int offset, offset2, ihl, verdict; |
1348 | bool ipip; | |
1da177e4 LT |
1349 | |
1350 | *related = 1; | |
1351 | ||
1352 | /* reassemble IP fragments */ | |
56f8a75c | 1353 | if (ip_is_fragment(ip_hdr(skb))) { |
1ca5bb54 | 1354 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) |
1da177e4 | 1355 | return NF_STOLEN; |
1da177e4 LT |
1356 | } |
1357 | ||
eddc9ec5 | 1358 | iph = ip_hdr(skb); |
1da177e4 LT |
1359 | offset = ihl = iph->ihl * 4; |
1360 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1361 | if (ic == NULL) | |
1362 | return NF_DROP; | |
1363 | ||
14d5e834 | 1364 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 1365 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 1366 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
1367 | |
1368 | /* | |
1369 | * Work through seeing if this is for us. | |
1370 | * These checks are supposed to be in an order that means easy | |
1371 | * things are checked first to speed up processing.... however | |
1372 | * this means that some packets will manage to get a long way | |
1373 | * down this stack and then be rejected, but that's life. | |
1374 | */ | |
1375 | if ((ic->type != ICMP_DEST_UNREACH) && | |
1376 | (ic->type != ICMP_SOURCE_QUENCH) && | |
1377 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
1378 | *related = 0; | |
1379 | return NF_ACCEPT; | |
1380 | } | |
1381 | ||
1382 | /* Now find the contained IP header */ | |
1383 | offset += sizeof(_icmph); | |
1384 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1385 | if (cih == NULL) | |
1386 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1387 | ||
9330419d | 1388 | net = skb_net(skb); |
7a4f0761 | 1389 | |
f2edb9f7 JA |
1390 | /* Special case for errors for IPIP packets */ |
1391 | ipip = false; | |
1392 | if (cih->protocol == IPPROTO_IPIP) { | |
1393 | if (unlikely(cih->frag_off & htons(IP_OFFSET))) | |
1394 | return NF_ACCEPT; | |
1395 | /* Error for our IPIP must arrive at LOCAL_IN */ | |
1396 | if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL)) | |
1397 | return NF_ACCEPT; | |
1398 | offset += cih->ihl * 4; | |
1399 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1400 | if (cih == NULL) | |
1401 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1402 | ipip = true; | |
1403 | } | |
1404 | ||
9330419d HS |
1405 | pd = ip_vs_proto_data_get(net, cih->protocol); |
1406 | if (!pd) | |
1da177e4 | 1407 | return NF_ACCEPT; |
9330419d | 1408 | pp = pd->pp; |
1da177e4 LT |
1409 | |
1410 | /* Is the embedded protocol header present? */ | |
4412ec49 | 1411 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
1412 | pp->dont_defrag)) |
1413 | return NF_ACCEPT; | |
1414 | ||
0d79641a JA |
1415 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, |
1416 | "Checking incoming ICMP for"); | |
1da177e4 | 1417 | |
f2edb9f7 | 1418 | offset2 = offset; |
63dca2c0 JDB |
1419 | ip_vs_fill_ip4hdr(cih, &ciph); |
1420 | ciph.len += offset; | |
1421 | offset = ciph.len; | |
f2edb9f7 JA |
1422 | /* The embedded headers contain source and dest in reverse order. |
1423 | * For IPIP this is error for request, not for reply. | |
1424 | */ | |
d4383f04 | 1425 | cp = pp->conn_in_get(AF_INET, skb, &ciph, ipip ? 0 : 1); |
6cb90db5 | 1426 | if (!cp) |
1da177e4 LT |
1427 | return NF_ACCEPT; |
1428 | ||
1429 | verdict = NF_DROP; | |
1430 | ||
1431 | /* Ensure the checksum is correct */ | |
60476372 | 1432 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 | 1433 | /* Failed checksum! */ |
14d5e834 HH |
1434 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
1435 | &iph->saddr); | |
1da177e4 LT |
1436 | goto out; |
1437 | } | |
1438 | ||
f2edb9f7 JA |
1439 | if (ipip) { |
1440 | __be32 info = ic->un.gateway; | |
f44a5f45 PC |
1441 | __u8 type = ic->type; |
1442 | __u8 code = ic->code; | |
f2edb9f7 JA |
1443 | |
1444 | /* Update the MTU */ | |
1445 | if (ic->type == ICMP_DEST_UNREACH && | |
1446 | ic->code == ICMP_FRAG_NEEDED) { | |
1447 | struct ip_vs_dest *dest = cp->dest; | |
1448 | u32 mtu = ntohs(ic->un.frag.mtu); | |
f44a5f45 | 1449 | __be16 frag_off = cih->frag_off; |
f2edb9f7 JA |
1450 | |
1451 | /* Strip outer IP and ICMP, go to IPIP header */ | |
f44a5f45 PC |
1452 | if (pskb_pull(skb, ihl + sizeof(_icmph)) == NULL) |
1453 | goto ignore_ipip; | |
f2edb9f7 JA |
1454 | offset2 -= ihl + sizeof(_icmph); |
1455 | skb_reset_network_header(skb); | |
1456 | IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n", | |
1457 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu); | |
f2edb9f7 JA |
1458 | ipv4_update_pmtu(skb, dev_net(skb->dev), |
1459 | mtu, 0, 0, 0, 0); | |
f2edb9f7 | 1460 | /* Client uses PMTUD? */ |
f44a5f45 | 1461 | if (!(frag_off & htons(IP_DF))) |
f2edb9f7 JA |
1462 | goto ignore_ipip; |
1463 | /* Prefer the resulting PMTU */ | |
1464 | if (dest) { | |
026ace06 JA |
1465 | struct ip_vs_dest_dst *dest_dst; |
1466 | ||
1467 | rcu_read_lock(); | |
1468 | dest_dst = rcu_dereference(dest->dest_dst); | |
1469 | if (dest_dst) | |
1470 | mtu = dst_mtu(dest_dst->dst_cache); | |
1471 | rcu_read_unlock(); | |
f2edb9f7 JA |
1472 | } |
1473 | if (mtu > 68 + sizeof(struct iphdr)) | |
1474 | mtu -= sizeof(struct iphdr); | |
1475 | info = htonl(mtu); | |
1476 | } | |
1477 | /* Strip outer IP, ICMP and IPIP, go to IP header of | |
1478 | * original request. | |
1479 | */ | |
f44a5f45 PC |
1480 | if (pskb_pull(skb, offset2) == NULL) |
1481 | goto ignore_ipip; | |
f2edb9f7 JA |
1482 | skb_reset_network_header(skb); |
1483 | IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n", | |
1484 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
f44a5f45 PC |
1485 | type, code, ntohl(info)); |
1486 | icmp_send(skb, type, code, info); | |
f2edb9f7 JA |
1487 | /* ICMP can be shorter but anyways, account it */ |
1488 | ip_vs_out_stats(cp, skb); | |
1489 | ||
1490 | ignore_ipip: | |
1491 | consume_skb(skb); | |
1492 | verdict = NF_STOLEN; | |
1493 | goto out; | |
1494 | } | |
1495 | ||
1da177e4 LT |
1496 | /* do the statistics and put it back */ |
1497 | ip_vs_in_stats(cp, skb); | |
06f3d7f9 JA |
1498 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol || |
1499 | IPPROTO_SCTP == cih->protocol) | |
1da177e4 | 1500 | offset += 2 * sizeof(__u16); |
d4383f04 | 1501 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph); |
1da177e4 | 1502 | |
552ad65a | 1503 | out: |
1da177e4 LT |
1504 | __ip_vs_conn_put(cp); |
1505 | ||
1506 | return verdict; | |
1507 | } | |
1508 | ||
2a3b791e | 1509 | #ifdef CONFIG_IP_VS_IPV6 |
d4383f04 JDB |
1510 | static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, |
1511 | unsigned int hooknum, struct ip_vs_iphdr *iph) | |
2a3b791e | 1512 | { |
9330419d | 1513 | struct net *net = NULL; |
63dca2c0 | 1514 | struct ipv6hdr _ip6h, *ip6h; |
2a3b791e | 1515 | struct icmp6hdr _icmph, *ic; |
63dca2c0 | 1516 | struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */ |
2a3b791e JV |
1517 | struct ip_vs_conn *cp; |
1518 | struct ip_vs_protocol *pp; | |
9330419d | 1519 | struct ip_vs_proto_data *pd; |
63dca2c0 | 1520 | unsigned int offs_ciph, writable, verdict; |
2a3b791e | 1521 | |
63dca2c0 | 1522 | *related = 1; |
2a3b791e | 1523 | |
2f74713d | 1524 | ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph, iph); |
2a3b791e JV |
1525 | if (ic == NULL) |
1526 | return NF_DROP; | |
1527 | ||
2a3b791e JV |
1528 | /* |
1529 | * Work through seeing if this is for us. | |
1530 | * These checks are supposed to be in an order that means easy | |
1531 | * things are checked first to speed up processing.... however | |
1532 | * this means that some packets will manage to get a long way | |
1533 | * down this stack and then be rejected, but that's life. | |
1534 | */ | |
2fab8917 | 1535 | if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) { |
2a3b791e JV |
1536 | *related = 0; |
1537 | return NF_ACCEPT; | |
1538 | } | |
2f74713d JDB |
1539 | /* Fragment header that is before ICMP header tells us that: |
1540 | * it's not an error message since they can't be fragmented. | |
1541 | */ | |
e7165030 | 1542 | if (iph->flags & IP6_FH_F_FRAG) |
2f74713d | 1543 | return NF_DROP; |
2a3b791e | 1544 | |
63dca2c0 JDB |
1545 | IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n", |
1546 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
1547 | &iph->saddr, &iph->daddr); | |
1548 | ||
2a3b791e | 1549 | /* Now find the contained IP header */ |
63dca2c0 JDB |
1550 | ciph.len = iph->len + sizeof(_icmph); |
1551 | offs_ciph = ciph.len; /* Save ip header offset */ | |
1552 | ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h); | |
1553 | if (ip6h == NULL) | |
2a3b791e | 1554 | return NF_ACCEPT; /* The packet looks wrong, ignore */ |
63dca2c0 JDB |
1555 | ciph.saddr.in6 = ip6h->saddr; /* conn_in_get() handles reverse order */ |
1556 | ciph.daddr.in6 = ip6h->daddr; | |
1557 | /* skip possible IPv6 exthdrs of contained IPv6 packet */ | |
1558 | ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL); | |
1559 | if (ciph.protocol < 0) | |
1560 | return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */ | |
2a3b791e | 1561 | |
9330419d | 1562 | net = skb_net(skb); |
63dca2c0 | 1563 | pd = ip_vs_proto_data_get(net, ciph.protocol); |
9330419d | 1564 | if (!pd) |
2a3b791e | 1565 | return NF_ACCEPT; |
9330419d | 1566 | pp = pd->pp; |
2a3b791e | 1567 | |
63dca2c0 JDB |
1568 | /* Cannot handle fragmented embedded protocol */ |
1569 | if (ciph.fragoffs) | |
2a3b791e JV |
1570 | return NF_ACCEPT; |
1571 | ||
63dca2c0 | 1572 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offs_ciph, |
0d79641a | 1573 | "Checking incoming ICMPv6 for"); |
2a3b791e | 1574 | |
2f74713d JDB |
1575 | /* The embedded headers contain source and dest in reverse order |
1576 | * if not from localhost | |
1577 | */ | |
d4383f04 | 1578 | cp = pp->conn_in_get(AF_INET6, skb, &ciph, |
2f74713d JDB |
1579 | (hooknum == NF_INET_LOCAL_OUT) ? 0 : 1); |
1580 | ||
6cb90db5 | 1581 | if (!cp) |
2a3b791e | 1582 | return NF_ACCEPT; |
2f74713d JDB |
1583 | /* VS/TUN, VS/DR and LOCALNODE just let it go */ |
1584 | if ((hooknum == NF_INET_LOCAL_OUT) && | |
1585 | (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) { | |
1586 | __ip_vs_conn_put(cp); | |
1587 | return NF_ACCEPT; | |
1588 | } | |
2a3b791e | 1589 | |
2a3b791e JV |
1590 | /* do the statistics and put it back */ |
1591 | ip_vs_in_stats(cp, skb); | |
63dca2c0 JDB |
1592 | |
1593 | /* Need to mangle contained IPv6 header in ICMPv6 packet */ | |
1594 | writable = ciph.len; | |
1595 | if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol || | |
1596 | IPPROTO_SCTP == ciph.protocol) | |
1597 | writable += 2 * sizeof(__u16); /* Also mangle ports */ | |
1598 | ||
d4383f04 | 1599 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, writable, hooknum, &ciph); |
2a3b791e JV |
1600 | |
1601 | __ip_vs_conn_put(cp); | |
1602 | ||
1603 | return verdict; | |
1604 | } | |
1605 | #endif | |
1606 | ||
1607 | ||
1da177e4 LT |
1608 | /* |
1609 | * Check if it's for virtual services, look it up, | |
1610 | * and send it on its way... | |
1611 | */ | |
1612 | static unsigned int | |
cb59155f | 1613 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af) |
1da177e4 | 1614 | { |
f131315f | 1615 | struct net *net; |
51ef348b | 1616 | struct ip_vs_iphdr iph; |
1da177e4 | 1617 | struct ip_vs_protocol *pp; |
9330419d | 1618 | struct ip_vs_proto_data *pd; |
1da177e4 | 1619 | struct ip_vs_conn *cp; |
4a516f11 | 1620 | int ret, pkts; |
f131315f | 1621 | struct netns_ipvs *ipvs; |
d752c364 | 1622 | int conn_reuse_mode; |
2a3b791e | 1623 | |
fc604767 JA |
1624 | /* Already marked as IPVS request or reply? */ |
1625 | if (skb->ipvs_property) | |
1626 | return NF_ACCEPT; | |
1627 | ||
1da177e4 | 1628 | /* |
cb59155f JA |
1629 | * Big tappo: |
1630 | * - remote client: only PACKET_HOST | |
1631 | * - route: used for struct net when skb->dev is unset | |
1da177e4 | 1632 | */ |
cb59155f JA |
1633 | if (unlikely((skb->pkt_type != PACKET_HOST && |
1634 | hooknum != NF_INET_LOCAL_OUT) || | |
1635 | !skb_dst(skb))) { | |
63dca2c0 | 1636 | ip_vs_fill_iph_skb(af, skb, &iph); |
cb59155f JA |
1637 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s" |
1638 | " ignored in hook %u\n", | |
1639 | skb->pkt_type, iph.protocol, | |
1640 | IP_VS_DBG_ADDR(af, &iph.daddr), hooknum); | |
1da177e4 LT |
1641 | return NF_ACCEPT; |
1642 | } | |
7a4f0761 HS |
1643 | /* ipvs enabled in this netns ? */ |
1644 | net = skb_net(skb); | |
0c12582f JA |
1645 | ipvs = net_ipvs(net); |
1646 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1647 | return NF_ACCEPT; |
1648 | ||
63dca2c0 | 1649 | ip_vs_fill_iph_skb(af, skb, &iph); |
cb59155f JA |
1650 | |
1651 | /* Bad... Do not break raw sockets */ | |
1652 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1653 | af == AF_INET)) { | |
1654 | struct sock *sk = skb->sk; | |
1655 | struct inet_sock *inet = inet_sk(skb->sk); | |
1656 | ||
1657 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1658 | return NF_ACCEPT; | |
1659 | } | |
1da177e4 | 1660 | |
94b26551 JV |
1661 | #ifdef CONFIG_IP_VS_IPV6 |
1662 | if (af == AF_INET6) { | |
1663 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1ca5bb54 | 1664 | int related; |
d4383f04 JDB |
1665 | int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum, |
1666 | &iph); | |
1da177e4 | 1667 | |
94b26551 JV |
1668 | if (related) |
1669 | return verdict; | |
94b26551 JV |
1670 | } |
1671 | } else | |
1672 | #endif | |
1673 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1ca5bb54 JA |
1674 | int related; |
1675 | int verdict = ip_vs_in_icmp(skb, &related, hooknum); | |
94b26551 JV |
1676 | |
1677 | if (related) | |
1678 | return verdict; | |
94b26551 | 1679 | } |
1da177e4 LT |
1680 | |
1681 | /* Protocol supported? */ | |
9330419d HS |
1682 | pd = ip_vs_proto_data_get(net, iph.protocol); |
1683 | if (unlikely(!pd)) | |
1da177e4 | 1684 | return NF_ACCEPT; |
9330419d | 1685 | pp = pd->pp; |
1da177e4 LT |
1686 | /* |
1687 | * Check if the packet belongs to an existing connection entry | |
1688 | */ | |
d4383f04 | 1689 | cp = pp->conn_in_get(af, skb, &iph, 0); |
dc7b3eb9 | 1690 | |
d752c364 MRL |
1691 | conn_reuse_mode = sysctl_conn_reuse_mode(ipvs); |
1692 | if (conn_reuse_mode && !iph.fragoffs && | |
1693 | is_new_conn(skb, &iph) && cp && | |
1694 | ((unlikely(sysctl_expire_nodest_conn(ipvs)) && cp->dest && | |
1695 | unlikely(!atomic_read(&cp->dest->weight))) || | |
1696 | unlikely(is_new_conn_expected(cp, conn_reuse_mode)))) { | |
1697 | if (!atomic_read(&cp->n_control)) | |
1698 | ip_vs_conn_expire_now(cp); | |
dc7b3eb9 GL |
1699 | __ip_vs_conn_put(cp); |
1700 | cp = NULL; | |
1701 | } | |
1702 | ||
63dca2c0 | 1703 | if (unlikely(!cp) && !iph.fragoffs) { |
2f74713d JDB |
1704 | /* No (second) fragments need to enter here, as nf_defrag_ipv6 |
1705 | * replayed fragment zero will already have created the cp | |
1706 | */ | |
1da177e4 LT |
1707 | int v; |
1708 | ||
2f74713d | 1709 | /* Schedule and create new connection entry into &cp */ |
d4383f04 | 1710 | if (!pp->conn_schedule(af, skb, pd, &v, &cp, &iph)) |
1da177e4 LT |
1711 | return v; |
1712 | } | |
1713 | ||
1714 | if (unlikely(!cp)) { | |
1715 | /* sorry, all this trouble for a no-hit :) */ | |
0d79641a | 1716 | IP_VS_DBG_PKT(12, af, pp, skb, 0, |
cb59155f | 1717 | "ip_vs_in: packet continues traversal as normal"); |
6aafeef0 | 1718 | if (iph.fragoffs) { |
2f74713d | 1719 | /* Fragment that couldn't be mapped to a conn entry |
2f74713d JDB |
1720 | * is missing module nf_defrag_ipv6 |
1721 | */ | |
1722 | IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n"); | |
1723 | IP_VS_DBG_PKT(7, af, pp, skb, 0, "unhandled fragment"); | |
1724 | } | |
1da177e4 LT |
1725 | return NF_ACCEPT; |
1726 | } | |
1727 | ||
0d79641a | 1728 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet"); |
1da177e4 LT |
1729 | /* Check the server status */ |
1730 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
1731 | /* the destination server is not available */ | |
1732 | ||
71a8ab6c | 1733 | if (sysctl_expire_nodest_conn(ipvs)) { |
1da177e4 LT |
1734 | /* try to expire the connection immediately */ |
1735 | ip_vs_conn_expire_now(cp); | |
1da177e4 | 1736 | } |
dc8103f2 JA |
1737 | /* don't restart its timer, and silently |
1738 | drop the packet. */ | |
1739 | __ip_vs_conn_put(cp); | |
1da177e4 LT |
1740 | return NF_DROP; |
1741 | } | |
1742 | ||
1743 | ip_vs_in_stats(cp, skb); | |
4a516f11 | 1744 | ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); |
1da177e4 | 1745 | if (cp->packet_xmit) |
d4383f04 | 1746 | ret = cp->packet_xmit(skb, cp, pp, &iph); |
1da177e4 LT |
1747 | /* do not touch skb anymore */ |
1748 | else { | |
1749 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
1750 | ret = NF_ACCEPT; | |
1751 | } | |
1752 | ||
efac5276 RB |
1753 | /* Increase its packet counter and check if it is needed |
1754 | * to be synchronized | |
1755 | * | |
1756 | * Sync connection if it is about to close to | |
1757 | * encorage the standby servers to update the connections timeout | |
986a0757 HS |
1758 | * |
1759 | * For ONE_PKT let ip_vs_sync_conn() do the filter work. | |
efac5276 | 1760 | */ |
f131315f | 1761 | |
986a0757 | 1762 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
59e0350e | 1763 | pkts = sysctl_sync_threshold(ipvs); |
986a0757 HS |
1764 | else |
1765 | pkts = atomic_add_return(1, &cp->in_pkts); | |
1766 | ||
749c42b6 JA |
1767 | if (ipvs->sync_state & IP_VS_STATE_MASTER) |
1768 | ip_vs_sync_conn(net, cp, pkts); | |
1da177e4 LT |
1769 | |
1770 | ip_vs_conn_put(cp); | |
1771 | return ret; | |
1772 | } | |
1773 | ||
cb59155f JA |
1774 | /* |
1775 | * AF_INET handler in NF_INET_LOCAL_IN chain | |
1776 | * Schedule and forward packets from remote clients | |
1777 | */ | |
1778 | static unsigned int | |
795aa6ef | 1779 | ip_vs_remote_request4(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1780 | const struct nf_hook_state *state) |
cb59155f | 1781 | { |
795aa6ef | 1782 | return ip_vs_in(ops->hooknum, skb, AF_INET); |
cb59155f JA |
1783 | } |
1784 | ||
1785 | /* | |
1786 | * AF_INET handler in NF_INET_LOCAL_OUT chain | |
1787 | * Schedule and forward packets from local clients | |
1788 | */ | |
1789 | static unsigned int | |
795aa6ef | 1790 | ip_vs_local_request4(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1791 | const struct nf_hook_state *state) |
cb59155f | 1792 | { |
795aa6ef | 1793 | return ip_vs_in(ops->hooknum, skb, AF_INET); |
cb59155f JA |
1794 | } |
1795 | ||
1796 | #ifdef CONFIG_IP_VS_IPV6 | |
1797 | ||
1798 | /* | |
1799 | * AF_INET6 handler in NF_INET_LOCAL_IN chain | |
1800 | * Schedule and forward packets from remote clients | |
1801 | */ | |
1802 | static unsigned int | |
795aa6ef | 1803 | ip_vs_remote_request6(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1804 | const struct nf_hook_state *state) |
cb59155f | 1805 | { |
795aa6ef | 1806 | return ip_vs_in(ops->hooknum, skb, AF_INET6); |
cb59155f JA |
1807 | } |
1808 | ||
1809 | /* | |
1810 | * AF_INET6 handler in NF_INET_LOCAL_OUT chain | |
1811 | * Schedule and forward packets from local clients | |
1812 | */ | |
1813 | static unsigned int | |
795aa6ef | 1814 | ip_vs_local_request6(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1815 | const struct nf_hook_state *state) |
cb59155f | 1816 | { |
795aa6ef | 1817 | return ip_vs_in(ops->hooknum, skb, AF_INET6); |
cb59155f JA |
1818 | } |
1819 | ||
1820 | #endif | |
1821 | ||
1da177e4 LT |
1822 | |
1823 | /* | |
6e23ae2a | 1824 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
1da177e4 LT |
1825 | * related packets destined for 0.0.0.0/0. |
1826 | * When fwmark-based virtual service is used, such as transparent | |
1827 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1828 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
6e23ae2a | 1829 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
1da177e4 LT |
1830 | * and send them to ip_vs_in_icmp. |
1831 | */ | |
1832 | static unsigned int | |
795aa6ef | 1833 | ip_vs_forward_icmp(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1834 | const struct nf_hook_state *state) |
1da177e4 LT |
1835 | { |
1836 | int r; | |
7a4f0761 | 1837 | struct net *net; |
0c12582f | 1838 | struct netns_ipvs *ipvs; |
1da177e4 | 1839 | |
3db05fea | 1840 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
1da177e4 LT |
1841 | return NF_ACCEPT; |
1842 | ||
7a4f0761 HS |
1843 | /* ipvs enabled in this netns ? */ |
1844 | net = skb_net(skb); | |
0c12582f JA |
1845 | ipvs = net_ipvs(net); |
1846 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1847 | return NF_ACCEPT; |
1848 | ||
795aa6ef | 1849 | return ip_vs_in_icmp(skb, &r, ops->hooknum); |
1da177e4 LT |
1850 | } |
1851 | ||
2a3b791e JV |
1852 | #ifdef CONFIG_IP_VS_IPV6 |
1853 | static unsigned int | |
795aa6ef | 1854 | ip_vs_forward_icmp_v6(const struct nf_hook_ops *ops, struct sk_buff *skb, |
238e54c9 | 1855 | const struct nf_hook_state *state) |
2a3b791e JV |
1856 | { |
1857 | int r; | |
7a4f0761 | 1858 | struct net *net; |
0c12582f | 1859 | struct netns_ipvs *ipvs; |
63dca2c0 | 1860 | struct ip_vs_iphdr iphdr; |
2a3b791e | 1861 | |
63dca2c0 JDB |
1862 | ip_vs_fill_iph_skb(AF_INET6, skb, &iphdr); |
1863 | if (iphdr.protocol != IPPROTO_ICMPV6) | |
2a3b791e JV |
1864 | return NF_ACCEPT; |
1865 | ||
7a4f0761 HS |
1866 | /* ipvs enabled in this netns ? */ |
1867 | net = skb_net(skb); | |
0c12582f JA |
1868 | ipvs = net_ipvs(net); |
1869 | if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable)) | |
7a4f0761 HS |
1870 | return NF_ACCEPT; |
1871 | ||
795aa6ef | 1872 | return ip_vs_in_icmp_v6(skb, &r, ops->hooknum, &iphdr); |
2a3b791e JV |
1873 | } |
1874 | #endif | |
1875 | ||
1da177e4 | 1876 | |
1999414a | 1877 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
cb59155f JA |
1878 | /* After packet filtering, change source only for VS/NAT */ |
1879 | { | |
1880 | .hook = ip_vs_reply4, | |
1881 | .owner = THIS_MODULE, | |
4c809d63 | 1882 | .pf = NFPROTO_IPV4, |
cb59155f | 1883 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1884 | .priority = NF_IP_PRI_NAT_SRC - 2, |
cb59155f | 1885 | }, |
41c5b317 PM |
1886 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1887 | * or VS/NAT(change destination), so that filtering rules can be | |
1888 | * applied to IPVS. */ | |
1889 | { | |
cb59155f | 1890 | .hook = ip_vs_remote_request4, |
41c5b317 | 1891 | .owner = THIS_MODULE, |
4c809d63 | 1892 | .pf = NFPROTO_IPV4, |
cb59155f | 1893 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1894 | .priority = NF_IP_PRI_NAT_SRC - 1, |
41c5b317 | 1895 | }, |
fc604767 | 1896 | /* Before ip_vs_in, change source only for VS/NAT */ |
41c5b317 | 1897 | { |
fc604767 | 1898 | .hook = ip_vs_local_reply4, |
41c5b317 | 1899 | .owner = THIS_MODULE, |
4c809d63 | 1900 | .pf = NFPROTO_IPV4, |
fc604767 | 1901 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1902 | .priority = NF_IP_PRI_NAT_DST + 1, |
41c5b317 | 1903 | }, |
cb59155f JA |
1904 | /* After mangle, schedule and forward local requests */ |
1905 | { | |
1906 | .hook = ip_vs_local_request4, | |
1907 | .owner = THIS_MODULE, | |
4c809d63 | 1908 | .pf = NFPROTO_IPV4, |
cb59155f | 1909 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1910 | .priority = NF_IP_PRI_NAT_DST + 2, |
cb59155f | 1911 | }, |
41c5b317 PM |
1912 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1913 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1914 | { | |
1915 | .hook = ip_vs_forward_icmp, | |
1916 | .owner = THIS_MODULE, | |
4c809d63 | 1917 | .pf = NFPROTO_IPV4, |
cb59155f JA |
1918 | .hooknum = NF_INET_FORWARD, |
1919 | .priority = 99, | |
41c5b317 | 1920 | }, |
fc604767 JA |
1921 | /* After packet filtering, change source only for VS/NAT */ |
1922 | { | |
1923 | .hook = ip_vs_reply4, | |
1924 | .owner = THIS_MODULE, | |
4c809d63 | 1925 | .pf = NFPROTO_IPV4, |
fc604767 JA |
1926 | .hooknum = NF_INET_FORWARD, |
1927 | .priority = 100, | |
1928 | }, | |
473b23d3 | 1929 | #ifdef CONFIG_IP_VS_IPV6 |
cb59155f JA |
1930 | /* After packet filtering, change source only for VS/NAT */ |
1931 | { | |
1932 | .hook = ip_vs_reply6, | |
1933 | .owner = THIS_MODULE, | |
4c809d63 | 1934 | .pf = NFPROTO_IPV6, |
cb59155f | 1935 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1936 | .priority = NF_IP6_PRI_NAT_SRC - 2, |
cb59155f | 1937 | }, |
473b23d3 JV |
1938 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1939 | * or VS/NAT(change destination), so that filtering rules can be | |
1940 | * applied to IPVS. */ | |
1941 | { | |
cb59155f | 1942 | .hook = ip_vs_remote_request6, |
473b23d3 | 1943 | .owner = THIS_MODULE, |
4c809d63 | 1944 | .pf = NFPROTO_IPV6, |
cb59155f | 1945 | .hooknum = NF_INET_LOCAL_IN, |
afb523c5 | 1946 | .priority = NF_IP6_PRI_NAT_SRC - 1, |
473b23d3 | 1947 | }, |
fc604767 | 1948 | /* Before ip_vs_in, change source only for VS/NAT */ |
473b23d3 | 1949 | { |
fc604767 | 1950 | .hook = ip_vs_local_reply6, |
473b23d3 | 1951 | .owner = THIS_MODULE, |
eb90b0c7 | 1952 | .pf = NFPROTO_IPV6, |
fc604767 | 1953 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1954 | .priority = NF_IP6_PRI_NAT_DST + 1, |
473b23d3 | 1955 | }, |
cb59155f JA |
1956 | /* After mangle, schedule and forward local requests */ |
1957 | { | |
1958 | .hook = ip_vs_local_request6, | |
1959 | .owner = THIS_MODULE, | |
4c809d63 | 1960 | .pf = NFPROTO_IPV6, |
cb59155f | 1961 | .hooknum = NF_INET_LOCAL_OUT, |
afb523c5 | 1962 | .priority = NF_IP6_PRI_NAT_DST + 2, |
cb59155f | 1963 | }, |
473b23d3 JV |
1964 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp |
1965 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1966 | { | |
1967 | .hook = ip_vs_forward_icmp_v6, | |
1968 | .owner = THIS_MODULE, | |
4c809d63 | 1969 | .pf = NFPROTO_IPV6, |
cb59155f JA |
1970 | .hooknum = NF_INET_FORWARD, |
1971 | .priority = 99, | |
473b23d3 | 1972 | }, |
fc604767 JA |
1973 | /* After packet filtering, change source only for VS/NAT */ |
1974 | { | |
1975 | .hook = ip_vs_reply6, | |
1976 | .owner = THIS_MODULE, | |
4c809d63 | 1977 | .pf = NFPROTO_IPV6, |
fc604767 JA |
1978 | .hooknum = NF_INET_FORWARD, |
1979 | .priority = 100, | |
1980 | }, | |
473b23d3 | 1981 | #endif |
1da177e4 | 1982 | }; |
61b1ab45 HS |
1983 | /* |
1984 | * Initialize IP Virtual Server netns mem. | |
1985 | */ | |
1986 | static int __net_init __ip_vs_init(struct net *net) | |
1987 | { | |
1988 | struct netns_ipvs *ipvs; | |
1989 | ||
61b1ab45 | 1990 | ipvs = net_generic(net, ip_vs_net_id); |
0a9ee813 | 1991 | if (ipvs == NULL) |
61b1ab45 | 1992 | return -ENOMEM; |
0a9ee813 | 1993 | |
7a4f0761 HS |
1994 | /* Hold the beast until a service is registerd */ |
1995 | ipvs->enable = 0; | |
f6340ee0 | 1996 | ipvs->net = net; |
61b1ab45 HS |
1997 | /* Counters used for creating unique names */ |
1998 | ipvs->gen = atomic_read(&ipvs_netns_cnt); | |
1999 | atomic_inc(&ipvs_netns_cnt); | |
2000 | net->ipvs = ipvs; | |
7a4f0761 | 2001 | |
503cf15a | 2002 | if (ip_vs_estimator_net_init(net) < 0) |
7a4f0761 HS |
2003 | goto estimator_fail; |
2004 | ||
503cf15a | 2005 | if (ip_vs_control_net_init(net) < 0) |
7a4f0761 HS |
2006 | goto control_fail; |
2007 | ||
503cf15a | 2008 | if (ip_vs_protocol_net_init(net) < 0) |
7a4f0761 HS |
2009 | goto protocol_fail; |
2010 | ||
503cf15a | 2011 | if (ip_vs_app_net_init(net) < 0) |
7a4f0761 HS |
2012 | goto app_fail; |
2013 | ||
503cf15a | 2014 | if (ip_vs_conn_net_init(net) < 0) |
7a4f0761 HS |
2015 | goto conn_fail; |
2016 | ||
503cf15a | 2017 | if (ip_vs_sync_net_init(net) < 0) |
7a4f0761 HS |
2018 | goto sync_fail; |
2019 | ||
a870c8c5 | 2020 | printk(KERN_INFO "IPVS: Creating netns size=%zu id=%d\n", |
61b1ab45 HS |
2021 | sizeof(struct netns_ipvs), ipvs->gen); |
2022 | return 0; | |
7a4f0761 HS |
2023 | /* |
2024 | * Error handling | |
2025 | */ | |
2026 | ||
2027 | sync_fail: | |
503cf15a | 2028 | ip_vs_conn_net_cleanup(net); |
7a4f0761 | 2029 | conn_fail: |
503cf15a | 2030 | ip_vs_app_net_cleanup(net); |
7a4f0761 | 2031 | app_fail: |
503cf15a | 2032 | ip_vs_protocol_net_cleanup(net); |
7a4f0761 | 2033 | protocol_fail: |
503cf15a | 2034 | ip_vs_control_net_cleanup(net); |
7a4f0761 | 2035 | control_fail: |
503cf15a | 2036 | ip_vs_estimator_net_cleanup(net); |
7a4f0761 | 2037 | estimator_fail: |
39f618b4 | 2038 | net->ipvs = NULL; |
7a4f0761 | 2039 | return -ENOMEM; |
61b1ab45 HS |
2040 | } |
2041 | ||
2042 | static void __net_exit __ip_vs_cleanup(struct net *net) | |
2043 | { | |
503cf15a HS |
2044 | ip_vs_service_net_cleanup(net); /* ip_vs_flush() with locks */ |
2045 | ip_vs_conn_net_cleanup(net); | |
2046 | ip_vs_app_net_cleanup(net); | |
2047 | ip_vs_protocol_net_cleanup(net); | |
2048 | ip_vs_control_net_cleanup(net); | |
2049 | ip_vs_estimator_net_cleanup(net); | |
1ae132b0 | 2050 | IP_VS_DBG(2, "ipvs netns %d released\n", net_ipvs(net)->gen); |
39f618b4 | 2051 | net->ipvs = NULL; |
61b1ab45 HS |
2052 | } |
2053 | ||
7a4f0761 HS |
2054 | static void __net_exit __ip_vs_dev_cleanup(struct net *net) |
2055 | { | |
2056 | EnterFunction(2); | |
2057 | net_ipvs(net)->enable = 0; /* Disable packet reception */ | |
8f4e0a18 | 2058 | smp_wmb(); |
503cf15a | 2059 | ip_vs_sync_net_cleanup(net); |
7a4f0761 HS |
2060 | LeaveFunction(2); |
2061 | } | |
2062 | ||
61b1ab45 HS |
2063 | static struct pernet_operations ipvs_core_ops = { |
2064 | .init = __ip_vs_init, | |
2065 | .exit = __ip_vs_cleanup, | |
2066 | .id = &ip_vs_net_id, | |
2067 | .size = sizeof(struct netns_ipvs), | |
2068 | }; | |
1da177e4 | 2069 | |
7a4f0761 HS |
2070 | static struct pernet_operations ipvs_core_dev_ops = { |
2071 | .exit = __ip_vs_dev_cleanup, | |
2072 | }; | |
2073 | ||
1da177e4 LT |
2074 | /* |
2075 | * Initialize IP Virtual Server | |
2076 | */ | |
2077 | static int __init ip_vs_init(void) | |
2078 | { | |
2079 | int ret; | |
2080 | ||
2081 | ret = ip_vs_control_init(); | |
2082 | if (ret < 0) { | |
1e3e238e | 2083 | pr_err("can't setup control.\n"); |
6c8f7949 | 2084 | goto exit; |
1da177e4 LT |
2085 | } |
2086 | ||
2087 | ip_vs_protocol_init(); | |
2088 | ||
1da177e4 LT |
2089 | ret = ip_vs_conn_init(); |
2090 | if (ret < 0) { | |
1e3e238e | 2091 | pr_err("can't setup connection table.\n"); |
6c8f7949 | 2092 | goto cleanup_protocol; |
61b1ab45 HS |
2093 | } |
2094 | ||
7a4f0761 HS |
2095 | ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */ |
2096 | if (ret < 0) | |
6c8f7949 | 2097 | goto cleanup_conn; |
7a4f0761 HS |
2098 | |
2099 | ret = register_pernet_device(&ipvs_core_dev_ops); | |
2100 | if (ret < 0) | |
2101 | goto cleanup_sub; | |
2102 | ||
41c5b317 | 2103 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 | 2104 | if (ret < 0) { |
1e3e238e | 2105 | pr_err("can't register hooks.\n"); |
7a4f0761 | 2106 | goto cleanup_dev; |
1da177e4 LT |
2107 | } |
2108 | ||
8537de8a HS |
2109 | ret = ip_vs_register_nl_ioctl(); |
2110 | if (ret < 0) { | |
2111 | pr_err("can't register netlink/ioctl.\n"); | |
2112 | goto cleanup_hooks; | |
2113 | } | |
2114 | ||
1e3e238e | 2115 | pr_info("ipvs loaded.\n"); |
7a4f0761 | 2116 | |
1da177e4 LT |
2117 | return ret; |
2118 | ||
8537de8a HS |
2119 | cleanup_hooks: |
2120 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); | |
7a4f0761 HS |
2121 | cleanup_dev: |
2122 | unregister_pernet_device(&ipvs_core_dev_ops); | |
2123 | cleanup_sub: | |
2124 | unregister_pernet_subsys(&ipvs_core_ops); | |
552ad65a | 2125 | cleanup_conn: |
1da177e4 | 2126 | ip_vs_conn_cleanup(); |
552ad65a | 2127 | cleanup_protocol: |
1da177e4 LT |
2128 | ip_vs_protocol_cleanup(); |
2129 | ip_vs_control_cleanup(); | |
6c8f7949 | 2130 | exit: |
1da177e4 LT |
2131 | return ret; |
2132 | } | |
2133 | ||
2134 | static void __exit ip_vs_cleanup(void) | |
2135 | { | |
8537de8a | 2136 | ip_vs_unregister_nl_ioctl(); |
41c5b317 | 2137 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
7a4f0761 HS |
2138 | unregister_pernet_device(&ipvs_core_dev_ops); |
2139 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ | |
1da177e4 | 2140 | ip_vs_conn_cleanup(); |
1da177e4 LT |
2141 | ip_vs_protocol_cleanup(); |
2142 | ip_vs_control_cleanup(); | |
1e3e238e | 2143 | pr_info("ipvs unloaded.\n"); |
1da177e4 LT |
2144 | } |
2145 | ||
2146 | module_init(ip_vs_init); | |
2147 | module_exit(ip_vs_cleanup); | |
2148 | MODULE_LICENSE("GPL"); |