Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IPVS An implementation of the IP virtual server support for the | |
3 | * LINUX operating system. IPVS is now implemented as a module | |
4 | * over the NetFilter framework. IPVS can be used to build a | |
5 | * high-performance and highly available server based on a | |
6 | * cluster of servers. | |
7 | * | |
b880c1f0 HS |
8 | * Version 1, is capable of handling both version 0 and 1 messages. |
9 | * Version 0 is the plain old format. | |
10 | * Note Version 0 receivers will just drop Ver 1 messages. | |
11 | * Version 1 is capable of handle IPv6, Persistence data, | |
12 | * time-outs, and firewall marks. | |
13 | * In ver.1 "ip_vs_sync_conn_options" will be sent in netw. order. | |
14 | * Ver. 0 can be turned on by sysctl -w net.ipv4.vs.sync_version=0 | |
15 | * | |
16 | * Definitions Message: is a complete datagram | |
17 | * Sync_conn: is a part of a Message | |
18 | * Param Data is an option to a Sync_conn. | |
19 | * | |
1da177e4 LT |
20 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
21 | * | |
22 | * ip_vs_sync: sync connection info from master load balancer to backups | |
23 | * through multicast | |
24 | * | |
25 | * Changes: | |
26 | * Alexandre Cassen : Added master & backup support at a time. | |
27 | * Alexandre Cassen : Added SyncID support for incoming sync | |
28 | * messages filtering. | |
29 | * Justin Ossevoort : Fix endian problem on sync message size. | |
b880c1f0 HS |
30 | * Hans Schillstrom : Added Version 1: i.e. IPv6, |
31 | * Persistence support, fwmark and time-out. | |
1da177e4 LT |
32 | */ |
33 | ||
9aada7ac HE |
34 | #define KMSG_COMPONENT "IPVS" |
35 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
36 | ||
1da177e4 LT |
37 | #include <linux/module.h> |
38 | #include <linux/slab.h> | |
14c85021 | 39 | #include <linux/inetdevice.h> |
1da177e4 LT |
40 | #include <linux/net.h> |
41 | #include <linux/completion.h> | |
42 | #include <linux/delay.h> | |
43 | #include <linux/skbuff.h> | |
44 | #include <linux/in.h> | |
45 | #include <linux/igmp.h> /* for ip_mc_join_group */ | |
14c85021 | 46 | #include <linux/udp.h> |
e6dd731c | 47 | #include <linux/err.h> |
998e7a76 | 48 | #include <linux/kthread.h> |
ba6fd850 | 49 | #include <linux/wait.h> |
e6f225eb | 50 | #include <linux/kernel.h> |
1da177e4 | 51 | |
fe5e7a1e HS |
52 | #include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */ |
53 | ||
1da177e4 LT |
54 | #include <net/ip.h> |
55 | #include <net/sock.h> | |
1da177e4 LT |
56 | |
57 | #include <net/ip_vs.h> | |
58 | ||
59 | #define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */ | |
60 | #define IP_VS_SYNC_PORT 8848 /* multicast port */ | |
61 | ||
2981bc9a | 62 | #define SYNC_PROTO_VER 1 /* Protocol version in header */ |
1da177e4 LT |
63 | |
64 | /* | |
65 | * IPVS sync connection entry | |
2981bc9a | 66 | * Version 0, i.e. original version. |
1da177e4 | 67 | */ |
2981bc9a | 68 | struct ip_vs_sync_conn_v0 { |
1da177e4 LT |
69 | __u8 reserved; |
70 | ||
71 | /* Protocol, addresses and port numbers */ | |
72 | __u8 protocol; /* Which protocol (TCP/UDP) */ | |
014d730d AV |
73 | __be16 cport; |
74 | __be16 vport; | |
75 | __be16 dport; | |
76 | __be32 caddr; /* client address */ | |
77 | __be32 vaddr; /* virtual address */ | |
78 | __be32 daddr; /* destination address */ | |
1da177e4 LT |
79 | |
80 | /* Flags and state transition */ | |
014d730d AV |
81 | __be16 flags; /* status flags */ |
82 | __be16 state; /* state info */ | |
1da177e4 LT |
83 | |
84 | /* The sequence options start here */ | |
85 | }; | |
86 | ||
87 | struct ip_vs_sync_conn_options { | |
88 | struct ip_vs_seq in_seq; /* incoming seq. struct */ | |
89 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ | |
90 | }; | |
91 | ||
2981bc9a HS |
92 | /* |
93 | Sync Connection format (sync_conn) | |
94 | ||
95 | 0 1 2 3 | |
96 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
97 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
98 | | Type | Protocol | Ver. | Size | | |
99 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
100 | | Flags | | |
101 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
102 | | State | cport | | |
103 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
104 | | vport | dport | | |
105 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
106 | | fwmark | | |
107 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
108 | | timeout (in sec.) | | |
109 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
110 | | ... | | |
111 | | IP-Addresses (v4 or v6) | | |
112 | | ... | | |
113 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
114 | Optional Parameters. | |
115 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
116 | | Param. Type | Param. Length | Param. data | | |
117 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | |
118 | | ... | | |
119 | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
120 | | | Param Type | Param. Length | | |
121 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
122 | | Param data | | |
123 | | Last Param data should be padded for 32 bit alignment | | |
124 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
125 | */ | |
126 | ||
127 | /* | |
128 | * Type 0, IPv4 sync connection format | |
129 | */ | |
130 | struct ip_vs_sync_v4 { | |
131 | __u8 type; | |
132 | __u8 protocol; /* Which protocol (TCP/UDP) */ | |
133 | __be16 ver_size; /* Version msb 4 bits */ | |
134 | /* Flags and state transition */ | |
135 | __be32 flags; /* status flags */ | |
136 | __be16 state; /* state info */ | |
137 | /* Protocol, addresses and port numbers */ | |
138 | __be16 cport; | |
139 | __be16 vport; | |
140 | __be16 dport; | |
141 | __be32 fwmark; /* Firewall mark from skb */ | |
142 | __be32 timeout; /* cp timeout */ | |
143 | __be32 caddr; /* client address */ | |
144 | __be32 vaddr; /* virtual address */ | |
145 | __be32 daddr; /* destination address */ | |
146 | /* The sequence options start here */ | |
147 | /* PE data padded to 32bit alignment after seq. options */ | |
148 | }; | |
149 | /* | |
150 | * Type 2 messages IPv6 | |
151 | */ | |
152 | struct ip_vs_sync_v6 { | |
153 | __u8 type; | |
154 | __u8 protocol; /* Which protocol (TCP/UDP) */ | |
155 | __be16 ver_size; /* Version msb 4 bits */ | |
156 | /* Flags and state transition */ | |
157 | __be32 flags; /* status flags */ | |
158 | __be16 state; /* state info */ | |
159 | /* Protocol, addresses and port numbers */ | |
160 | __be16 cport; | |
161 | __be16 vport; | |
162 | __be16 dport; | |
163 | __be32 fwmark; /* Firewall mark from skb */ | |
164 | __be32 timeout; /* cp timeout */ | |
165 | struct in6_addr caddr; /* client address */ | |
166 | struct in6_addr vaddr; /* virtual address */ | |
167 | struct in6_addr daddr; /* destination address */ | |
168 | /* The sequence options start here */ | |
169 | /* PE data padded to 32bit alignment after seq. options */ | |
170 | }; | |
171 | ||
172 | union ip_vs_sync_conn { | |
173 | struct ip_vs_sync_v4 v4; | |
174 | struct ip_vs_sync_v6 v6; | |
175 | }; | |
176 | ||
177 | /* Bits in Type field in above */ | |
178 | #define STYPE_INET6 0 | |
179 | #define STYPE_F_INET6 (1 << STYPE_INET6) | |
180 | ||
181 | #define SVER_SHIFT 12 /* Shift to get version */ | |
182 | #define SVER_MASK 0x0fff /* Mask to strip version */ | |
183 | ||
184 | #define IPVS_OPT_SEQ_DATA 1 | |
185 | #define IPVS_OPT_PE_DATA 2 | |
186 | #define IPVS_OPT_PE_NAME 3 | |
187 | #define IPVS_OPT_PARAM 7 | |
188 | ||
189 | #define IPVS_OPT_F_SEQ_DATA (1 << (IPVS_OPT_SEQ_DATA-1)) | |
190 | #define IPVS_OPT_F_PE_DATA (1 << (IPVS_OPT_PE_DATA-1)) | |
191 | #define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME-1)) | |
192 | #define IPVS_OPT_F_PARAM (1 << (IPVS_OPT_PARAM-1)) | |
193 | ||
cc0191ae | 194 | struct ip_vs_sync_thread_data { |
f131315f | 195 | struct net *net; |
998e7a76 SW |
196 | struct socket *sock; |
197 | char *buf; | |
cc0191ae NH |
198 | }; |
199 | ||
2981bc9a HS |
200 | /* Version 0 definition of packet sizes */ |
201 | #define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0)) | |
1da177e4 | 202 | #define FULL_CONN_SIZE \ |
2981bc9a | 203 | (sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options)) |
1da177e4 LT |
204 | |
205 | ||
206 | /* | |
2981bc9a HS |
207 | The master mulitcasts messages (Datagrams) to the backup load balancers |
208 | in the following format. | |
209 | ||
210 | Version 1: | |
211 | Note, first byte should be Zero, so ver 0 receivers will drop the packet. | |
1da177e4 LT |
212 | |
213 | 0 1 2 3 | |
214 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
215 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2981bc9a HS |
216 | | 0 | SyncID | Size | |
217 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
218 | | Count Conns | Version | Reserved, set to Zero | | |
1da177e4 LT |
219 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
220 | | | | |
221 | | IPVS Sync Connection (1) | | |
222 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
223 | | . | | |
2981bc9a | 224 | ~ . ~ |
1da177e4 LT |
225 | | . | |
226 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
227 | | | | |
228 | | IPVS Sync Connection (n) | | |
229 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2981bc9a HS |
230 | |
231 | Version 0 Header | |
232 | 0 1 2 3 | |
233 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
234 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
235 | | Count Conns | SyncID | Size | | |
236 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
237 | | IPVS Sync Connection (1) | | |
1da177e4 LT |
238 | */ |
239 | ||
240 | #define SYNC_MESG_HEADER_LEN 4 | |
e6f225eb | 241 | #define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */ |
1da177e4 | 242 | |
2981bc9a | 243 | /* Version 0 header */ |
986a0757 | 244 | struct ip_vs_sync_mesg_v0 { |
1da177e4 LT |
245 | __u8 nr_conns; |
246 | __u8 syncid; | |
247 | __u16 size; | |
248 | ||
249 | /* ip_vs_sync_conn entries start here */ | |
250 | }; | |
251 | ||
2981bc9a | 252 | /* Version 1 header */ |
986a0757 | 253 | struct ip_vs_sync_mesg { |
2981bc9a HS |
254 | __u8 reserved; /* must be zero */ |
255 | __u8 syncid; | |
256 | __u16 size; | |
257 | __u8 nr_conns; | |
258 | __s8 version; /* SYNC_PROTO_VER */ | |
259 | __u16 spare; | |
260 | /* ip_vs_sync_conn entries start here */ | |
261 | }; | |
262 | ||
1da177e4 LT |
263 | struct ip_vs_sync_buff { |
264 | struct list_head list; | |
265 | unsigned long firstuse; | |
266 | ||
267 | /* pointers for the message data */ | |
268 | struct ip_vs_sync_mesg *mesg; | |
269 | unsigned char *head; | |
270 | unsigned char *end; | |
271 | }; | |
272 | ||
1da177e4 | 273 | /* multicast addr */ |
d5640050 SW |
274 | static struct sockaddr_in mcast_addr = { |
275 | .sin_family = AF_INET, | |
09640e63 HH |
276 | .sin_port = cpu_to_be16(IP_VS_SYNC_PORT), |
277 | .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP), | |
d5640050 | 278 | }; |
1da177e4 | 279 | |
fe5e7a1e HS |
280 | /* |
281 | * Copy of struct ip_vs_seq | |
282 | * From unaligned network order to aligned host order | |
283 | */ | |
284 | static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho) | |
285 | { | |
286 | ho->init_seq = get_unaligned_be32(&no->init_seq); | |
287 | ho->delta = get_unaligned_be32(&no->delta); | |
288 | ho->previous_delta = get_unaligned_be32(&no->previous_delta); | |
289 | } | |
1da177e4 | 290 | |
986a0757 HS |
291 | /* |
292 | * Copy of struct ip_vs_seq | |
293 | * From Aligned host order to unaligned network order | |
294 | */ | |
295 | static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no) | |
296 | { | |
297 | put_unaligned_be32(ho->init_seq, &no->init_seq); | |
298 | put_unaligned_be32(ho->delta, &no->delta); | |
299 | put_unaligned_be32(ho->previous_delta, &no->previous_delta); | |
300 | } | |
301 | ||
f131315f | 302 | static inline struct ip_vs_sync_buff *sb_dequeue(struct netns_ipvs *ipvs) |
1da177e4 LT |
303 | { |
304 | struct ip_vs_sync_buff *sb; | |
305 | ||
f131315f HS |
306 | spin_lock_bh(&ipvs->sync_lock); |
307 | if (list_empty(&ipvs->sync_queue)) { | |
1da177e4 LT |
308 | sb = NULL; |
309 | } else { | |
f131315f | 310 | sb = list_entry(ipvs->sync_queue.next, |
1da177e4 LT |
311 | struct ip_vs_sync_buff, |
312 | list); | |
313 | list_del(&sb->list); | |
314 | } | |
f131315f | 315 | spin_unlock_bh(&ipvs->sync_lock); |
1da177e4 LT |
316 | |
317 | return sb; | |
318 | } | |
319 | ||
986a0757 HS |
320 | /* |
321 | * Create a new sync buffer for Version 1 proto. | |
322 | */ | |
f131315f HS |
323 | static inline struct ip_vs_sync_buff * |
324 | ip_vs_sync_buff_create(struct netns_ipvs *ipvs) | |
1da177e4 LT |
325 | { |
326 | struct ip_vs_sync_buff *sb; | |
327 | ||
328 | if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC))) | |
329 | return NULL; | |
330 | ||
f131315f HS |
331 | sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC); |
332 | if (!sb->mesg) { | |
1da177e4 LT |
333 | kfree(sb); |
334 | return NULL; | |
335 | } | |
986a0757 HS |
336 | sb->mesg->reserved = 0; /* old nr_conns i.e. must be zeo now */ |
337 | sb->mesg->version = SYNC_PROTO_VER; | |
f131315f | 338 | sb->mesg->syncid = ipvs->master_syncid; |
986a0757 HS |
339 | sb->mesg->size = sizeof(struct ip_vs_sync_mesg); |
340 | sb->mesg->nr_conns = 0; | |
341 | sb->mesg->spare = 0; | |
342 | sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg); | |
f131315f | 343 | sb->end = (unsigned char *)sb->mesg + ipvs->send_mesg_maxlen; |
986a0757 | 344 | |
1da177e4 LT |
345 | sb->firstuse = jiffies; |
346 | return sb; | |
347 | } | |
348 | ||
349 | static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb) | |
350 | { | |
351 | kfree(sb->mesg); | |
352 | kfree(sb); | |
353 | } | |
354 | ||
f131315f | 355 | static inline void sb_queue_tail(struct netns_ipvs *ipvs) |
998e7a76 | 356 | { |
f131315f HS |
357 | struct ip_vs_sync_buff *sb = ipvs->sync_buff; |
358 | ||
359 | spin_lock(&ipvs->sync_lock); | |
360 | if (ipvs->sync_state & IP_VS_STATE_MASTER) | |
361 | list_add_tail(&sb->list, &ipvs->sync_queue); | |
998e7a76 SW |
362 | else |
363 | ip_vs_sync_buff_release(sb); | |
f131315f | 364 | spin_unlock(&ipvs->sync_lock); |
998e7a76 SW |
365 | } |
366 | ||
1da177e4 LT |
367 | /* |
368 | * Get the current sync buffer if it has been created for more | |
369 | * than the specified time or the specified time is zero. | |
370 | */ | |
371 | static inline struct ip_vs_sync_buff * | |
f131315f | 372 | get_curr_sync_buff(struct netns_ipvs *ipvs, unsigned long time) |
1da177e4 LT |
373 | { |
374 | struct ip_vs_sync_buff *sb; | |
375 | ||
f131315f | 376 | spin_lock_bh(&ipvs->sync_buff_lock); |
16a7fd32 TW |
377 | if (ipvs->sync_buff && |
378 | time_after_eq(jiffies - ipvs->sync_buff->firstuse, time)) { | |
f131315f HS |
379 | sb = ipvs->sync_buff; |
380 | ipvs->sync_buff = NULL; | |
1da177e4 LT |
381 | } else |
382 | sb = NULL; | |
f131315f | 383 | spin_unlock_bh(&ipvs->sync_buff_lock); |
1da177e4 LT |
384 | return sb; |
385 | } | |
386 | ||
b880c1f0 HS |
387 | /* |
388 | * Switch mode from sending version 0 or 1 | |
389 | * - must handle sync_buf | |
390 | */ | |
f131315f HS |
391 | void ip_vs_sync_switch_mode(struct net *net, int mode) |
392 | { | |
393 | struct netns_ipvs *ipvs = net_ipvs(net); | |
b880c1f0 | 394 | |
7c9989a7 | 395 | if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) |
b880c1f0 | 396 | return; |
7532e8d4 | 397 | if (mode == sysctl_sync_ver(ipvs) || !ipvs->sync_buff) |
b880c1f0 HS |
398 | return; |
399 | ||
f131315f | 400 | spin_lock_bh(&ipvs->sync_buff_lock); |
b880c1f0 | 401 | /* Buffer empty ? then let buf_create do the job */ |
f131315f HS |
402 | if (ipvs->sync_buff->mesg->size <= sizeof(struct ip_vs_sync_mesg)) { |
403 | kfree(ipvs->sync_buff); | |
404 | ipvs->sync_buff = NULL; | |
b880c1f0 | 405 | } else { |
f131315f HS |
406 | spin_lock_bh(&ipvs->sync_lock); |
407 | if (ipvs->sync_state & IP_VS_STATE_MASTER) | |
408 | list_add_tail(&ipvs->sync_buff->list, | |
409 | &ipvs->sync_queue); | |
b880c1f0 | 410 | else |
f131315f HS |
411 | ip_vs_sync_buff_release(ipvs->sync_buff); |
412 | spin_unlock_bh(&ipvs->sync_lock); | |
b880c1f0 | 413 | } |
f131315f | 414 | spin_unlock_bh(&ipvs->sync_buff_lock); |
b880c1f0 HS |
415 | } |
416 | ||
417 | /* | |
418 | * Create a new sync buffer for Version 0 proto. | |
419 | */ | |
f131315f HS |
420 | static inline struct ip_vs_sync_buff * |
421 | ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs) | |
b880c1f0 HS |
422 | { |
423 | struct ip_vs_sync_buff *sb; | |
424 | struct ip_vs_sync_mesg_v0 *mesg; | |
425 | ||
426 | if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC))) | |
427 | return NULL; | |
428 | ||
f131315f HS |
429 | sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC); |
430 | if (!sb->mesg) { | |
b880c1f0 HS |
431 | kfree(sb); |
432 | return NULL; | |
433 | } | |
434 | mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg; | |
435 | mesg->nr_conns = 0; | |
f131315f HS |
436 | mesg->syncid = ipvs->master_syncid; |
437 | mesg->size = sizeof(struct ip_vs_sync_mesg_v0); | |
438 | sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0); | |
439 | sb->end = (unsigned char *)mesg + ipvs->send_mesg_maxlen; | |
b880c1f0 HS |
440 | sb->firstuse = jiffies; |
441 | return sb; | |
442 | } | |
443 | ||
444 | /* | |
445 | * Version 0 , could be switched in by sys_ctl. | |
446 | * Add an ip_vs_conn information into the current sync_buff. | |
447 | */ | |
f131315f | 448 | void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp) |
b880c1f0 | 449 | { |
f131315f | 450 | struct netns_ipvs *ipvs = net_ipvs(net); |
b880c1f0 HS |
451 | struct ip_vs_sync_mesg_v0 *m; |
452 | struct ip_vs_sync_conn_v0 *s; | |
453 | int len; | |
454 | ||
455 | if (unlikely(cp->af != AF_INET)) | |
456 | return; | |
457 | /* Do not sync ONE PACKET */ | |
458 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) | |
459 | return; | |
460 | ||
f131315f HS |
461 | spin_lock(&ipvs->sync_buff_lock); |
462 | if (!ipvs->sync_buff) { | |
463 | ipvs->sync_buff = | |
464 | ip_vs_sync_buff_create_v0(ipvs); | |
465 | if (!ipvs->sync_buff) { | |
466 | spin_unlock(&ipvs->sync_buff_lock); | |
b880c1f0 HS |
467 | pr_err("ip_vs_sync_buff_create failed.\n"); |
468 | return; | |
469 | } | |
470 | } | |
471 | ||
472 | len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE : | |
473 | SIMPLE_CONN_SIZE; | |
f131315f HS |
474 | m = (struct ip_vs_sync_mesg_v0 *)ipvs->sync_buff->mesg; |
475 | s = (struct ip_vs_sync_conn_v0 *)ipvs->sync_buff->head; | |
b880c1f0 HS |
476 | |
477 | /* copy members */ | |
478 | s->reserved = 0; | |
479 | s->protocol = cp->protocol; | |
480 | s->cport = cp->cport; | |
481 | s->vport = cp->vport; | |
482 | s->dport = cp->dport; | |
483 | s->caddr = cp->caddr.ip; | |
484 | s->vaddr = cp->vaddr.ip; | |
485 | s->daddr = cp->daddr.ip; | |
486 | s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED); | |
487 | s->state = htons(cp->state); | |
488 | if (cp->flags & IP_VS_CONN_F_SEQ_MASK) { | |
489 | struct ip_vs_sync_conn_options *opt = | |
490 | (struct ip_vs_sync_conn_options *)&s[1]; | |
491 | memcpy(opt, &cp->in_seq, sizeof(*opt)); | |
492 | } | |
493 | ||
494 | m->nr_conns++; | |
495 | m->size += len; | |
f131315f | 496 | ipvs->sync_buff->head += len; |
b880c1f0 HS |
497 | |
498 | /* check if there is a space for next one */ | |
f131315f HS |
499 | if (ipvs->sync_buff->head + FULL_CONN_SIZE > ipvs->sync_buff->end) { |
500 | sb_queue_tail(ipvs); | |
501 | ipvs->sync_buff = NULL; | |
b880c1f0 | 502 | } |
f131315f | 503 | spin_unlock(&ipvs->sync_buff_lock); |
b880c1f0 HS |
504 | |
505 | /* synchronize its controller if it has */ | |
506 | if (cp->control) | |
f131315f | 507 | ip_vs_sync_conn(net, cp->control); |
b880c1f0 HS |
508 | } |
509 | ||
1da177e4 LT |
510 | /* |
511 | * Add an ip_vs_conn information into the current sync_buff. | |
512 | * Called by ip_vs_in. | |
986a0757 | 513 | * Sending Version 1 messages |
1da177e4 | 514 | */ |
f131315f | 515 | void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp) |
1da177e4 | 516 | { |
f131315f | 517 | struct netns_ipvs *ipvs = net_ipvs(net); |
1da177e4 | 518 | struct ip_vs_sync_mesg *m; |
986a0757 HS |
519 | union ip_vs_sync_conn *s; |
520 | __u8 *p; | |
521 | unsigned int len, pe_name_len, pad; | |
522 | ||
b880c1f0 | 523 | /* Handle old version of the protocol */ |
7532e8d4 | 524 | if (sysctl_sync_ver(ipvs) == 0) { |
f131315f | 525 | ip_vs_sync_conn_v0(net, cp); |
b880c1f0 HS |
526 | return; |
527 | } | |
986a0757 HS |
528 | /* Do not sync ONE PACKET */ |
529 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) | |
530 | goto control; | |
531 | sloop: | |
532 | /* Sanity checks */ | |
533 | pe_name_len = 0; | |
534 | if (cp->pe_data_len) { | |
535 | if (!cp->pe_data || !cp->dest) { | |
536 | IP_VS_ERR_RL("SYNC, connection pe_data invalid\n"); | |
537 | return; | |
538 | } | |
539 | pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN); | |
540 | } | |
1da177e4 | 541 | |
f131315f | 542 | spin_lock(&ipvs->sync_buff_lock); |
986a0757 HS |
543 | |
544 | #ifdef CONFIG_IP_VS_IPV6 | |
545 | if (cp->af == AF_INET6) | |
546 | len = sizeof(struct ip_vs_sync_v6); | |
547 | else | |
548 | #endif | |
549 | len = sizeof(struct ip_vs_sync_v4); | |
550 | ||
551 | if (cp->flags & IP_VS_CONN_F_SEQ_MASK) | |
552 | len += sizeof(struct ip_vs_sync_conn_options) + 2; | |
553 | ||
554 | if (cp->pe_data_len) | |
555 | len += cp->pe_data_len + 2; /* + Param hdr field */ | |
556 | if (pe_name_len) | |
557 | len += pe_name_len + 2; | |
558 | ||
559 | /* check if there is a space for this one */ | |
560 | pad = 0; | |
f131315f HS |
561 | if (ipvs->sync_buff) { |
562 | pad = (4 - (size_t)ipvs->sync_buff->head) & 3; | |
563 | if (ipvs->sync_buff->head + len + pad > ipvs->sync_buff->end) { | |
564 | sb_queue_tail(ipvs); | |
565 | ipvs->sync_buff = NULL; | |
986a0757 HS |
566 | pad = 0; |
567 | } | |
568 | } | |
569 | ||
f131315f HS |
570 | if (!ipvs->sync_buff) { |
571 | ipvs->sync_buff = ip_vs_sync_buff_create(ipvs); | |
572 | if (!ipvs->sync_buff) { | |
573 | spin_unlock(&ipvs->sync_buff_lock); | |
1e3e238e | 574 | pr_err("ip_vs_sync_buff_create failed.\n"); |
1da177e4 LT |
575 | return; |
576 | } | |
577 | } | |
578 | ||
f131315f HS |
579 | m = ipvs->sync_buff->mesg; |
580 | p = ipvs->sync_buff->head; | |
581 | ipvs->sync_buff->head += pad + len; | |
986a0757 HS |
582 | m->size += pad + len; |
583 | /* Add ev. padding from prev. sync_conn */ | |
584 | while (pad--) | |
585 | *(p++) = 0; | |
586 | ||
587 | s = (union ip_vs_sync_conn *)p; | |
588 | ||
589 | /* Set message type & copy members */ | |
590 | s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0); | |
591 | s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */ | |
592 | s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED); | |
593 | s->v4.state = htons(cp->state); | |
594 | s->v4.protocol = cp->protocol; | |
595 | s->v4.cport = cp->cport; | |
596 | s->v4.vport = cp->vport; | |
597 | s->v4.dport = cp->dport; | |
598 | s->v4.fwmark = htonl(cp->fwmark); | |
599 | s->v4.timeout = htonl(cp->timeout / HZ); | |
1da177e4 | 600 | m->nr_conns++; |
1da177e4 | 601 | |
986a0757 HS |
602 | #ifdef CONFIG_IP_VS_IPV6 |
603 | if (cp->af == AF_INET6) { | |
604 | p += sizeof(struct ip_vs_sync_v6); | |
605 | ipv6_addr_copy(&s->v6.caddr, &cp->caddr.in6); | |
606 | ipv6_addr_copy(&s->v6.vaddr, &cp->vaddr.in6); | |
607 | ipv6_addr_copy(&s->v6.daddr, &cp->daddr.in6); | |
608 | } else | |
609 | #endif | |
610 | { | |
611 | p += sizeof(struct ip_vs_sync_v4); /* options ptr */ | |
612 | s->v4.caddr = cp->caddr.ip; | |
613 | s->v4.vaddr = cp->vaddr.ip; | |
614 | s->v4.daddr = cp->daddr.ip; | |
615 | } | |
616 | if (cp->flags & IP_VS_CONN_F_SEQ_MASK) { | |
617 | *(p++) = IPVS_OPT_SEQ_DATA; | |
618 | *(p++) = sizeof(struct ip_vs_sync_conn_options); | |
619 | hton_seq((struct ip_vs_seq *)p, &cp->in_seq); | |
620 | p += sizeof(struct ip_vs_seq); | |
621 | hton_seq((struct ip_vs_seq *)p, &cp->out_seq); | |
622 | p += sizeof(struct ip_vs_seq); | |
1da177e4 | 623 | } |
986a0757 HS |
624 | /* Handle pe data */ |
625 | if (cp->pe_data_len && cp->pe_data) { | |
626 | *(p++) = IPVS_OPT_PE_DATA; | |
627 | *(p++) = cp->pe_data_len; | |
628 | memcpy(p, cp->pe_data, cp->pe_data_len); | |
629 | p += cp->pe_data_len; | |
630 | if (pe_name_len) { | |
631 | /* Add PE_NAME */ | |
632 | *(p++) = IPVS_OPT_PE_NAME; | |
633 | *(p++) = pe_name_len; | |
634 | memcpy(p, cp->pe->name, pe_name_len); | |
635 | p += pe_name_len; | |
636 | } | |
637 | } | |
638 | ||
f131315f | 639 | spin_unlock(&ipvs->sync_buff_lock); |
1da177e4 | 640 | |
986a0757 | 641 | control: |
1da177e4 | 642 | /* synchronize its controller if it has */ |
986a0757 HS |
643 | cp = cp->control; |
644 | if (!cp) | |
645 | return; | |
646 | /* | |
647 | * Reduce sync rate for templates | |
648 | * i.e only increment in_pkts for Templates. | |
649 | */ | |
650 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) { | |
651 | int pkts = atomic_add_return(1, &cp->in_pkts); | |
652 | ||
59e0350e | 653 | if (pkts % sysctl_sync_period(ipvs) != 1) |
986a0757 HS |
654 | return; |
655 | } | |
656 | goto sloop; | |
1da177e4 LT |
657 | } |
658 | ||
fe5e7a1e HS |
659 | /* |
660 | * fill_param used by version 1 | |
661 | */ | |
85999283 | 662 | static inline int |
6e67e586 | 663 | ip_vs_conn_fill_param_sync(struct net *net, int af, union ip_vs_sync_conn *sc, |
fe5e7a1e HS |
664 | struct ip_vs_conn_param *p, |
665 | __u8 *pe_data, unsigned int pe_data_len, | |
666 | __u8 *pe_name, unsigned int pe_name_len) | |
85999283 | 667 | { |
fe5e7a1e HS |
668 | #ifdef CONFIG_IP_VS_IPV6 |
669 | if (af == AF_INET6) | |
6e67e586 | 670 | ip_vs_conn_fill_param(net, af, sc->v6.protocol, |
fe5e7a1e HS |
671 | (const union nf_inet_addr *)&sc->v6.caddr, |
672 | sc->v6.cport, | |
673 | (const union nf_inet_addr *)&sc->v6.vaddr, | |
674 | sc->v6.vport, p); | |
675 | else | |
676 | #endif | |
6e67e586 | 677 | ip_vs_conn_fill_param(net, af, sc->v4.protocol, |
fe5e7a1e HS |
678 | (const union nf_inet_addr *)&sc->v4.caddr, |
679 | sc->v4.cport, | |
680 | (const union nf_inet_addr *)&sc->v4.vaddr, | |
681 | sc->v4.vport, p); | |
682 | /* Handle pe data */ | |
683 | if (pe_data_len) { | |
684 | if (pe_name_len) { | |
685 | char buff[IP_VS_PENAME_MAXLEN+1]; | |
686 | ||
687 | memcpy(buff, pe_name, pe_name_len); | |
688 | buff[pe_name_len]=0; | |
689 | p->pe = __ip_vs_pe_getbyname(buff); | |
690 | if (!p->pe) { | |
f131315f HS |
691 | IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n", |
692 | buff); | |
fe5e7a1e HS |
693 | return 1; |
694 | } | |
695 | } else { | |
696 | IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n"); | |
697 | return 1; | |
698 | } | |
699 | ||
6060c74a | 700 | p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC); |
fe5e7a1e HS |
701 | if (!p->pe_data) { |
702 | if (p->pe->module) | |
703 | module_put(p->pe->module); | |
704 | return -ENOMEM; | |
705 | } | |
fe5e7a1e HS |
706 | p->pe_data_len = pe_data_len; |
707 | } | |
85999283 SH |
708 | return 0; |
709 | } | |
1da177e4 LT |
710 | |
711 | /* | |
fe5e7a1e HS |
712 | * Connection Add / Update. |
713 | * Common for version 0 and 1 reception of backup sync_conns. | |
714 | * Param: ... | |
715 | * timeout is in sec. | |
1da177e4 | 716 | */ |
9bbac6a9 HS |
717 | static void ip_vs_proc_conn(struct net *net, struct ip_vs_conn_param *param, |
718 | unsigned int flags, unsigned int state, | |
719 | unsigned int protocol, unsigned int type, | |
fe5e7a1e HS |
720 | const union nf_inet_addr *daddr, __be16 dport, |
721 | unsigned long timeout, __u32 fwmark, | |
9bbac6a9 | 722 | struct ip_vs_sync_conn_options *opt) |
fe5e7a1e HS |
723 | { |
724 | struct ip_vs_dest *dest; | |
725 | struct ip_vs_conn *cp; | |
a0840e2e | 726 | struct netns_ipvs *ipvs = net_ipvs(net); |
fe5e7a1e | 727 | |
fe5e7a1e HS |
728 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) |
729 | cp = ip_vs_conn_in_get(param); | |
730 | else | |
731 | cp = ip_vs_ct_in_get(param); | |
732 | ||
733 | if (cp && param->pe_data) /* Free pe_data */ | |
734 | kfree(param->pe_data); | |
735 | if (!cp) { | |
736 | /* | |
737 | * Find the appropriate destination for the connection. | |
738 | * If it is not found the connection will remain unbound | |
739 | * but still handled. | |
740 | */ | |
f131315f | 741 | dest = ip_vs_find_dest(net, type, daddr, dport, param->vaddr, |
fe5e7a1e HS |
742 | param->vport, protocol, fwmark); |
743 | ||
744 | /* Set the approprite ativity flag */ | |
745 | if (protocol == IPPROTO_TCP) { | |
746 | if (state != IP_VS_TCP_S_ESTABLISHED) | |
747 | flags |= IP_VS_CONN_F_INACTIVE; | |
748 | else | |
749 | flags &= ~IP_VS_CONN_F_INACTIVE; | |
750 | } else if (protocol == IPPROTO_SCTP) { | |
751 | if (state != IP_VS_SCTP_S_ESTABLISHED) | |
752 | flags |= IP_VS_CONN_F_INACTIVE; | |
753 | else | |
754 | flags &= ~IP_VS_CONN_F_INACTIVE; | |
755 | } | |
756 | cp = ip_vs_conn_new(param, daddr, dport, flags, dest, fwmark); | |
757 | if (dest) | |
758 | atomic_dec(&dest->refcnt); | |
759 | if (!cp) { | |
760 | if (param->pe_data) | |
761 | kfree(param->pe_data); | |
762 | IP_VS_DBG(2, "BACKUP, add new conn. failed\n"); | |
763 | return; | |
764 | } | |
765 | } else if (!cp->dest) { | |
766 | dest = ip_vs_try_bind_dest(cp); | |
767 | if (dest) | |
768 | atomic_dec(&dest->refcnt); | |
769 | } else if ((cp->dest) && (cp->protocol == IPPROTO_TCP) && | |
770 | (cp->state != state)) { | |
771 | /* update active/inactive flag for the connection */ | |
772 | dest = cp->dest; | |
773 | if (!(cp->flags & IP_VS_CONN_F_INACTIVE) && | |
774 | (state != IP_VS_TCP_S_ESTABLISHED)) { | |
775 | atomic_dec(&dest->activeconns); | |
776 | atomic_inc(&dest->inactconns); | |
777 | cp->flags |= IP_VS_CONN_F_INACTIVE; | |
778 | } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) && | |
779 | (state == IP_VS_TCP_S_ESTABLISHED)) { | |
780 | atomic_inc(&dest->activeconns); | |
781 | atomic_dec(&dest->inactconns); | |
782 | cp->flags &= ~IP_VS_CONN_F_INACTIVE; | |
783 | } | |
784 | } else if ((cp->dest) && (cp->protocol == IPPROTO_SCTP) && | |
785 | (cp->state != state)) { | |
786 | dest = cp->dest; | |
787 | if (!(cp->flags & IP_VS_CONN_F_INACTIVE) && | |
788 | (state != IP_VS_SCTP_S_ESTABLISHED)) { | |
789 | atomic_dec(&dest->activeconns); | |
790 | atomic_inc(&dest->inactconns); | |
791 | cp->flags &= ~IP_VS_CONN_F_INACTIVE; | |
792 | } | |
793 | } | |
794 | ||
795 | if (opt) | |
796 | memcpy(&cp->in_seq, opt, sizeof(*opt)); | |
59e0350e | 797 | atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs)); |
fe5e7a1e HS |
798 | cp->state = state; |
799 | cp->old_state = cp->state; | |
800 | /* | |
801 | * For Ver 0 messages style | |
802 | * - Not possible to recover the right timeout for templates | |
803 | * - can not find the right fwmark | |
804 | * virtual service. If needed, we can do it for | |
805 | * non-fwmark persistent services. | |
806 | * Ver 1 messages style. | |
807 | * - No problem. | |
808 | */ | |
809 | if (timeout) { | |
810 | if (timeout > MAX_SCHEDULE_TIMEOUT / HZ) | |
811 | timeout = MAX_SCHEDULE_TIMEOUT / HZ; | |
812 | cp->timeout = timeout*HZ; | |
9bbac6a9 HS |
813 | } else { |
814 | struct ip_vs_proto_data *pd; | |
815 | ||
816 | pd = ip_vs_proto_data_get(net, protocol); | |
817 | if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table) | |
818 | cp->timeout = pd->timeout_table[state]; | |
819 | else | |
820 | cp->timeout = (3*60*HZ); | |
821 | } | |
fe5e7a1e HS |
822 | ip_vs_conn_put(cp); |
823 | } | |
824 | ||
825 | /* | |
826 | * Process received multicast message for Version 0 | |
827 | */ | |
9bbac6a9 HS |
828 | static void ip_vs_process_message_v0(struct net *net, const char *buffer, |
829 | const size_t buflen) | |
1da177e4 | 830 | { |
986a0757 | 831 | struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer; |
2981bc9a | 832 | struct ip_vs_sync_conn_v0 *s; |
1da177e4 | 833 | struct ip_vs_sync_conn_options *opt; |
5c81833c | 834 | struct ip_vs_protocol *pp; |
f11017ec | 835 | struct ip_vs_conn_param param; |
1da177e4 LT |
836 | char *p; |
837 | int i; | |
838 | ||
986a0757 | 839 | p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0); |
1da177e4 | 840 | for (i=0; i<m->nr_conns; i++) { |
b209639e | 841 | unsigned flags, state; |
87375ab4 | 842 | |
2ad17def | 843 | if (p + SIMPLE_CONN_SIZE > buffer+buflen) { |
fe5e7a1e | 844 | IP_VS_ERR_RL("BACKUP v0, bogus conn\n"); |
2ad17def JA |
845 | return; |
846 | } | |
2981bc9a | 847 | s = (struct ip_vs_sync_conn_v0 *) p; |
7a4fbb1f | 848 | flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC; |
2ad17def JA |
849 | flags &= ~IP_VS_CONN_F_HASHED; |
850 | if (flags & IP_VS_CONN_F_SEQ_MASK) { | |
851 | opt = (struct ip_vs_sync_conn_options *)&s[1]; | |
852 | p += FULL_CONN_SIZE; | |
853 | if (p > buffer+buflen) { | |
fe5e7a1e | 854 | IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n"); |
2ad17def JA |
855 | return; |
856 | } | |
857 | } else { | |
858 | opt = NULL; | |
859 | p += SIMPLE_CONN_SIZE; | |
860 | } | |
861 | ||
b209639e | 862 | state = ntohs(s->state); |
2ad17def JA |
863 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) { |
864 | pp = ip_vs_proto_get(s->protocol); | |
865 | if (!pp) { | |
fe5e7a1e | 866 | IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n", |
2ad17def JA |
867 | s->protocol); |
868 | continue; | |
869 | } | |
870 | if (state >= pp->num_states) { | |
fe5e7a1e | 871 | IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n", |
2ad17def JA |
872 | pp->name, state); |
873 | continue; | |
874 | } | |
875 | } else { | |
876 | /* protocol in templates is not used for state/timeout */ | |
2ad17def | 877 | if (state > 0) { |
fe5e7a1e | 878 | IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n", |
2ad17def JA |
879 | state); |
880 | state = 0; | |
881 | } | |
882 | } | |
883 | ||
6e67e586 | 884 | ip_vs_conn_fill_param(net, AF_INET, s->protocol, |
fe5e7a1e HS |
885 | (const union nf_inet_addr *)&s->caddr, |
886 | s->cport, | |
887 | (const union nf_inet_addr *)&s->vaddr, | |
888 | s->vport, ¶m); | |
889 | ||
890 | /* Send timeout as Zero */ | |
9bbac6a9 | 891 | ip_vs_proc_conn(net, ¶m, flags, state, s->protocol, AF_INET, |
fe5e7a1e | 892 | (union nf_inet_addr *)&s->daddr, s->dport, |
9bbac6a9 | 893 | 0, 0, opt); |
fe5e7a1e HS |
894 | } |
895 | } | |
896 | ||
897 | /* | |
898 | * Handle options | |
899 | */ | |
900 | static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen, | |
901 | __u32 *opt_flags, | |
902 | struct ip_vs_sync_conn_options *opt) | |
903 | { | |
904 | struct ip_vs_sync_conn_options *topt; | |
905 | ||
906 | topt = (struct ip_vs_sync_conn_options *)p; | |
907 | ||
908 | if (plen != sizeof(struct ip_vs_sync_conn_options)) { | |
909 | IP_VS_DBG(2, "BACKUP, bogus conn options length\n"); | |
910 | return -EINVAL; | |
911 | } | |
912 | if (*opt_flags & IPVS_OPT_F_SEQ_DATA) { | |
913 | IP_VS_DBG(2, "BACKUP, conn options found twice\n"); | |
914 | return -EINVAL; | |
915 | } | |
916 | ntoh_seq(&topt->in_seq, &opt->in_seq); | |
917 | ntoh_seq(&topt->out_seq, &opt->out_seq); | |
918 | *opt_flags |= IPVS_OPT_F_SEQ_DATA; | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len, | |
923 | __u8 **data, unsigned int maxlen, | |
924 | __u32 *opt_flags, __u32 flag) | |
925 | { | |
926 | if (plen > maxlen) { | |
927 | IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen); | |
928 | return -EINVAL; | |
929 | } | |
930 | if (*opt_flags & flag) { | |
931 | IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag); | |
932 | return -EINVAL; | |
933 | } | |
934 | *data_len = plen; | |
935 | *data = p; | |
936 | *opt_flags |= flag; | |
937 | return 0; | |
938 | } | |
939 | /* | |
940 | * Process a Version 1 sync. connection | |
941 | */ | |
9bbac6a9 | 942 | static inline int ip_vs_proc_sync_conn(struct net *net, __u8 *p, __u8 *msg_end) |
fe5e7a1e HS |
943 | { |
944 | struct ip_vs_sync_conn_options opt; | |
945 | union ip_vs_sync_conn *s; | |
946 | struct ip_vs_protocol *pp; | |
947 | struct ip_vs_conn_param param; | |
948 | __u32 flags; | |
949 | unsigned int af, state, pe_data_len=0, pe_name_len=0; | |
950 | __u8 *pe_data=NULL, *pe_name=NULL; | |
951 | __u32 opt_flags=0; | |
952 | int retc=0; | |
953 | ||
954 | s = (union ip_vs_sync_conn *) p; | |
955 | ||
956 | if (s->v6.type & STYPE_F_INET6) { | |
957 | #ifdef CONFIG_IP_VS_IPV6 | |
958 | af = AF_INET6; | |
959 | p += sizeof(struct ip_vs_sync_v6); | |
960 | #else | |
961 | IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n"); | |
962 | retc = 10; | |
963 | goto out; | |
964 | #endif | |
965 | } else if (!s->v4.type) { | |
966 | af = AF_INET; | |
967 | p += sizeof(struct ip_vs_sync_v4); | |
968 | } else { | |
969 | return -10; | |
970 | } | |
971 | if (p > msg_end) | |
972 | return -20; | |
973 | ||
974 | /* Process optional params check Type & Len. */ | |
975 | while (p < msg_end) { | |
976 | int ptype; | |
977 | int plen; | |
978 | ||
979 | if (p+2 > msg_end) | |
980 | return -30; | |
981 | ptype = *(p++); | |
982 | plen = *(p++); | |
983 | ||
984 | if (!plen || ((p + plen) > msg_end)) | |
985 | return -40; | |
986 | /* Handle seq option p = param data */ | |
987 | switch (ptype & ~IPVS_OPT_F_PARAM) { | |
988 | case IPVS_OPT_SEQ_DATA: | |
989 | if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt)) | |
990 | return -50; | |
991 | break; | |
992 | ||
993 | case IPVS_OPT_PE_DATA: | |
994 | if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data, | |
995 | IP_VS_PEDATA_MAXLEN, &opt_flags, | |
996 | IPVS_OPT_F_PE_DATA)) | |
997 | return -60; | |
998 | break; | |
999 | ||
1000 | case IPVS_OPT_PE_NAME: | |
1001 | if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name, | |
1002 | IP_VS_PENAME_MAXLEN, &opt_flags, | |
1003 | IPVS_OPT_F_PE_NAME)) | |
1004 | return -70; | |
1005 | break; | |
1006 | ||
1007 | default: | |
1008 | /* Param data mandatory ? */ | |
1009 | if (!(ptype & IPVS_OPT_F_PARAM)) { | |
1010 | IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n", | |
1011 | ptype & ~IPVS_OPT_F_PARAM); | |
1012 | retc = 20; | |
1013 | goto out; | |
1014 | } | |
f11017ec | 1015 | } |
fe5e7a1e HS |
1016 | p += plen; /* Next option */ |
1017 | } | |
1018 | ||
1019 | /* Get flags and Mask off unsupported */ | |
1020 | flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK; | |
1021 | flags |= IP_VS_CONN_F_SYNC; | |
1022 | state = ntohs(s->v4.state); | |
1023 | ||
1024 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) { | |
1025 | pp = ip_vs_proto_get(s->v4.protocol); | |
1026 | if (!pp) { | |
1027 | IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n", | |
1028 | s->v4.protocol); | |
1029 | retc = 30; | |
1030 | goto out; | |
1031 | } | |
1032 | if (state >= pp->num_states) { | |
1033 | IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n", | |
1034 | pp->name, state); | |
1035 | retc = 40; | |
1036 | goto out; | |
1037 | } | |
1038 | } else { | |
1039 | /* protocol in templates is not used for state/timeout */ | |
fe5e7a1e HS |
1040 | if (state > 0) { |
1041 | IP_VS_DBG(3, "BACKUP, Invalid template state %u\n", | |
1042 | state); | |
1043 | state = 0; | |
1044 | } | |
1045 | } | |
6e67e586 HS |
1046 | if (ip_vs_conn_fill_param_sync(net, af, s, ¶m, pe_data, |
1047 | pe_data_len, pe_name, pe_name_len)) { | |
fe5e7a1e HS |
1048 | retc = 50; |
1049 | goto out; | |
1050 | } | |
1051 | /* If only IPv4, just silent skip IPv6 */ | |
1052 | if (af == AF_INET) | |
9bbac6a9 | 1053 | ip_vs_proc_conn(net, ¶m, flags, state, s->v4.protocol, af, |
fe5e7a1e HS |
1054 | (union nf_inet_addr *)&s->v4.daddr, s->v4.dport, |
1055 | ntohl(s->v4.timeout), ntohl(s->v4.fwmark), | |
9bbac6a9 HS |
1056 | (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL) |
1057 | ); | |
fe5e7a1e HS |
1058 | #ifdef CONFIG_IP_VS_IPV6 |
1059 | else | |
9bbac6a9 | 1060 | ip_vs_proc_conn(net, ¶m, flags, state, s->v6.protocol, af, |
fe5e7a1e HS |
1061 | (union nf_inet_addr *)&s->v6.daddr, s->v6.dport, |
1062 | ntohl(s->v6.timeout), ntohl(s->v6.fwmark), | |
9bbac6a9 HS |
1063 | (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL) |
1064 | ); | |
fe5e7a1e HS |
1065 | #endif |
1066 | return 0; | |
1067 | /* Error exit */ | |
1068 | out: | |
1069 | IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc); | |
1070 | return retc; | |
1071 | ||
1072 | } | |
1073 | /* | |
1074 | * Process received multicast message and create the corresponding | |
1075 | * ip_vs_conn entries. | |
1076 | * Handles Version 0 & 1 | |
1077 | */ | |
9bbac6a9 HS |
1078 | static void ip_vs_process_message(struct net *net, __u8 *buffer, |
1079 | const size_t buflen) | |
fe5e7a1e | 1080 | { |
f131315f | 1081 | struct netns_ipvs *ipvs = net_ipvs(net); |
986a0757 | 1082 | struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer; |
fe5e7a1e | 1083 | __u8 *p, *msg_end; |
986a0757 | 1084 | int i, nr_conns; |
fe5e7a1e | 1085 | |
986a0757 | 1086 | if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) { |
fe5e7a1e HS |
1087 | IP_VS_DBG(2, "BACKUP, message header too short\n"); |
1088 | return; | |
1089 | } | |
1090 | /* Convert size back to host byte order */ | |
1091 | m2->size = ntohs(m2->size); | |
1092 | ||
1093 | if (buflen != m2->size) { | |
1094 | IP_VS_DBG(2, "BACKUP, bogus message size\n"); | |
1095 | return; | |
1096 | } | |
1097 | /* SyncID sanity check */ | |
f131315f | 1098 | if (ipvs->backup_syncid != 0 && m2->syncid != ipvs->backup_syncid) { |
fe5e7a1e HS |
1099 | IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid); |
1100 | return; | |
1101 | } | |
1102 | /* Handle version 1 message */ | |
1103 | if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0) | |
1104 | && (m2->spare == 0)) { | |
1105 | ||
986a0757 | 1106 | msg_end = buffer + sizeof(struct ip_vs_sync_mesg); |
fe5e7a1e HS |
1107 | nr_conns = m2->nr_conns; |
1108 | ||
1109 | for (i=0; i<nr_conns; i++) { | |
1110 | union ip_vs_sync_conn *s; | |
1111 | unsigned size; | |
1112 | int retc; | |
1113 | ||
1114 | p = msg_end; | |
1115 | if (p + sizeof(s->v4) > buffer+buflen) { | |
1116 | IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n"); | |
1117 | return; | |
b209639e | 1118 | } |
fe5e7a1e HS |
1119 | s = (union ip_vs_sync_conn *)p; |
1120 | size = ntohs(s->v4.ver_size) & SVER_MASK; | |
1121 | msg_end = p + size; | |
1122 | /* Basic sanity checks */ | |
1123 | if (msg_end > buffer+buflen) { | |
1124 | IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n"); | |
1da177e4 LT |
1125 | return; |
1126 | } | |
fe5e7a1e HS |
1127 | if (ntohs(s->v4.ver_size) >> SVER_SHIFT) { |
1128 | IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n", | |
1129 | ntohs(s->v4.ver_size) >> SVER_SHIFT); | |
1130 | return; | |
b209639e | 1131 | } |
fe5e7a1e | 1132 | /* Process a single sync_conn */ |
9bbac6a9 HS |
1133 | retc = ip_vs_proc_sync_conn(net, p, msg_end); |
1134 | if (retc < 0) { | |
fe5e7a1e HS |
1135 | IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n", |
1136 | retc); | |
1137 | return; | |
2906f66a | 1138 | } |
fe5e7a1e HS |
1139 | /* Make sure we have 32 bit alignment */ |
1140 | msg_end = p + ((size + 3) & ~3); | |
b209639e | 1141 | } |
fe5e7a1e HS |
1142 | } else { |
1143 | /* Old type of message */ | |
9bbac6a9 | 1144 | ip_vs_process_message_v0(net, buffer, buflen); |
fe5e7a1e | 1145 | return; |
1da177e4 LT |
1146 | } |
1147 | } | |
1148 | ||
1149 | ||
1150 | /* | |
1151 | * Setup loopback of outgoing multicasts on a sending socket | |
1152 | */ | |
1153 | static void set_mcast_loop(struct sock *sk, u_char loop) | |
1154 | { | |
1155 | struct inet_sock *inet = inet_sk(sk); | |
1156 | ||
1157 | /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */ | |
1158 | lock_sock(sk); | |
1159 | inet->mc_loop = loop ? 1 : 0; | |
1160 | release_sock(sk); | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Specify TTL for outgoing multicasts on a sending socket | |
1165 | */ | |
1166 | static void set_mcast_ttl(struct sock *sk, u_char ttl) | |
1167 | { | |
1168 | struct inet_sock *inet = inet_sk(sk); | |
1169 | ||
1170 | /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */ | |
1171 | lock_sock(sk); | |
1172 | inet->mc_ttl = ttl; | |
1173 | release_sock(sk); | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Specifiy default interface for outgoing multicasts | |
1178 | */ | |
1179 | static int set_mcast_if(struct sock *sk, char *ifname) | |
1180 | { | |
1181 | struct net_device *dev; | |
1182 | struct inet_sock *inet = inet_sk(sk); | |
f131315f | 1183 | struct net *net = sock_net(sk); |
1da177e4 | 1184 | |
f131315f HS |
1185 | dev = __dev_get_by_name(net, ifname); |
1186 | if (!dev) | |
1da177e4 LT |
1187 | return -ENODEV; |
1188 | ||
1189 | if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) | |
1190 | return -EINVAL; | |
1191 | ||
1192 | lock_sock(sk); | |
1193 | inet->mc_index = dev->ifindex; | |
1194 | /* inet->mc_addr = 0; */ | |
1195 | release_sock(sk); | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | ||
1201 | /* | |
1202 | * Set the maximum length of sync message according to the | |
1203 | * specified interface's MTU. | |
1204 | */ | |
f131315f | 1205 | static int set_sync_mesg_maxlen(struct net *net, int sync_state) |
1da177e4 | 1206 | { |
f131315f | 1207 | struct netns_ipvs *ipvs = net_ipvs(net); |
1da177e4 LT |
1208 | struct net_device *dev; |
1209 | int num; | |
1210 | ||
1211 | if (sync_state == IP_VS_STATE_MASTER) { | |
f131315f HS |
1212 | dev = __dev_get_by_name(net, ipvs->master_mcast_ifn); |
1213 | if (!dev) | |
1da177e4 LT |
1214 | return -ENODEV; |
1215 | ||
1216 | num = (dev->mtu - sizeof(struct iphdr) - | |
1217 | sizeof(struct udphdr) - | |
1218 | SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE; | |
f131315f | 1219 | ipvs->send_mesg_maxlen = SYNC_MESG_HEADER_LEN + |
e6f225eb | 1220 | SIMPLE_CONN_SIZE * min(num, MAX_CONNS_PER_SYNCBUFF); |
1da177e4 | 1221 | IP_VS_DBG(7, "setting the maximum length of sync sending " |
f131315f | 1222 | "message %d.\n", ipvs->send_mesg_maxlen); |
1da177e4 | 1223 | } else if (sync_state == IP_VS_STATE_BACKUP) { |
f131315f HS |
1224 | dev = __dev_get_by_name(net, ipvs->backup_mcast_ifn); |
1225 | if (!dev) | |
1da177e4 LT |
1226 | return -ENODEV; |
1227 | ||
f131315f | 1228 | ipvs->recv_mesg_maxlen = dev->mtu - |
1da177e4 LT |
1229 | sizeof(struct iphdr) - sizeof(struct udphdr); |
1230 | IP_VS_DBG(7, "setting the maximum length of sync receiving " | |
f131315f | 1231 | "message %d.\n", ipvs->recv_mesg_maxlen); |
1da177e4 LT |
1232 | } |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | ||
1238 | /* | |
1239 | * Join a multicast group. | |
1240 | * the group is specified by a class D multicast address 224.0.0.0/8 | |
1241 | * in the in_addr structure passed in as a parameter. | |
1242 | */ | |
1243 | static int | |
1244 | join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname) | |
1245 | { | |
f131315f | 1246 | struct net *net = sock_net(sk); |
1da177e4 LT |
1247 | struct ip_mreqn mreq; |
1248 | struct net_device *dev; | |
1249 | int ret; | |
1250 | ||
1251 | memset(&mreq, 0, sizeof(mreq)); | |
1252 | memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr)); | |
1253 | ||
f131315f HS |
1254 | dev = __dev_get_by_name(net, ifname); |
1255 | if (!dev) | |
1da177e4 LT |
1256 | return -ENODEV; |
1257 | if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) | |
1258 | return -EINVAL; | |
1259 | ||
1260 | mreq.imr_ifindex = dev->ifindex; | |
1261 | ||
1262 | lock_sock(sk); | |
1263 | ret = ip_mc_join_group(sk, &mreq); | |
1264 | release_sock(sk); | |
1265 | ||
1266 | return ret; | |
1267 | } | |
1268 | ||
1269 | ||
1270 | static int bind_mcastif_addr(struct socket *sock, char *ifname) | |
1271 | { | |
f131315f | 1272 | struct net *net = sock_net(sock->sk); |
1da177e4 | 1273 | struct net_device *dev; |
a61ced5d | 1274 | __be32 addr; |
1da177e4 LT |
1275 | struct sockaddr_in sin; |
1276 | ||
f131315f HS |
1277 | dev = __dev_get_by_name(net, ifname); |
1278 | if (!dev) | |
1da177e4 LT |
1279 | return -ENODEV; |
1280 | ||
1281 | addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
1282 | if (!addr) | |
1e3e238e HE |
1283 | pr_err("You probably need to specify IP address on " |
1284 | "multicast interface.\n"); | |
1da177e4 | 1285 | |
14d5e834 HH |
1286 | IP_VS_DBG(7, "binding socket with (%s) %pI4\n", |
1287 | ifname, &addr); | |
1da177e4 LT |
1288 | |
1289 | /* Now bind the socket with the address of multicast interface */ | |
1290 | sin.sin_family = AF_INET; | |
1291 | sin.sin_addr.s_addr = addr; | |
1292 | sin.sin_port = 0; | |
1293 | ||
1294 | return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin)); | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Set up sending multicast socket over UDP | |
1299 | */ | |
f131315f | 1300 | static struct socket *make_send_sock(struct net *net) |
1da177e4 | 1301 | { |
f131315f | 1302 | struct netns_ipvs *ipvs = net_ipvs(net); |
1da177e4 | 1303 | struct socket *sock; |
e6dd731c | 1304 | int result; |
1da177e4 LT |
1305 | |
1306 | /* First create a socket */ | |
4b3fd571 | 1307 | result = __sock_create(net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock, 1); |
e6dd731c | 1308 | if (result < 0) { |
1e3e238e | 1309 | pr_err("Error during creation of socket; terminating\n"); |
e6dd731c | 1310 | return ERR_PTR(result); |
1da177e4 LT |
1311 | } |
1312 | ||
f131315f | 1313 | result = set_mcast_if(sock->sk, ipvs->master_mcast_ifn); |
e6dd731c | 1314 | if (result < 0) { |
1e3e238e | 1315 | pr_err("Error setting outbound mcast interface\n"); |
1da177e4 LT |
1316 | goto error; |
1317 | } | |
1318 | ||
1319 | set_mcast_loop(sock->sk, 0); | |
1320 | set_mcast_ttl(sock->sk, 1); | |
1321 | ||
f131315f | 1322 | result = bind_mcastif_addr(sock, ipvs->master_mcast_ifn); |
e6dd731c | 1323 | if (result < 0) { |
1e3e238e | 1324 | pr_err("Error binding address of the mcast interface\n"); |
1da177e4 LT |
1325 | goto error; |
1326 | } | |
1327 | ||
e6dd731c SW |
1328 | result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr, |
1329 | sizeof(struct sockaddr), 0); | |
1330 | if (result < 0) { | |
1e3e238e | 1331 | pr_err("Error connecting to the multicast addr\n"); |
1da177e4 LT |
1332 | goto error; |
1333 | } | |
1334 | ||
1335 | return sock; | |
1336 | ||
1337 | error: | |
1338 | sock_release(sock); | |
e6dd731c | 1339 | return ERR_PTR(result); |
1da177e4 LT |
1340 | } |
1341 | ||
1342 | ||
1343 | /* | |
1344 | * Set up receiving multicast socket over UDP | |
1345 | */ | |
f131315f | 1346 | static struct socket *make_receive_sock(struct net *net) |
1da177e4 | 1347 | { |
f131315f | 1348 | struct netns_ipvs *ipvs = net_ipvs(net); |
1da177e4 | 1349 | struct socket *sock; |
e6dd731c | 1350 | int result; |
1da177e4 LT |
1351 | |
1352 | /* First create a socket */ | |
4b3fd571 | 1353 | result = __sock_create(net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock, 1); |
e6dd731c | 1354 | if (result < 0) { |
1e3e238e | 1355 | pr_err("Error during creation of socket; terminating\n"); |
e6dd731c | 1356 | return ERR_PTR(result); |
1da177e4 LT |
1357 | } |
1358 | ||
1359 | /* it is equivalent to the REUSEADDR option in user-space */ | |
1360 | sock->sk->sk_reuse = 1; | |
1361 | ||
e6dd731c SW |
1362 | result = sock->ops->bind(sock, (struct sockaddr *) &mcast_addr, |
1363 | sizeof(struct sockaddr)); | |
1364 | if (result < 0) { | |
1e3e238e | 1365 | pr_err("Error binding to the multicast addr\n"); |
1da177e4 LT |
1366 | goto error; |
1367 | } | |
1368 | ||
1369 | /* join the multicast group */ | |
e6dd731c SW |
1370 | result = join_mcast_group(sock->sk, |
1371 | (struct in_addr *) &mcast_addr.sin_addr, | |
f131315f | 1372 | ipvs->backup_mcast_ifn); |
e6dd731c | 1373 | if (result < 0) { |
1e3e238e | 1374 | pr_err("Error joining to the multicast group\n"); |
1da177e4 LT |
1375 | goto error; |
1376 | } | |
1377 | ||
1378 | return sock; | |
1379 | ||
1380 | error: | |
1381 | sock_release(sock); | |
e6dd731c | 1382 | return ERR_PTR(result); |
1da177e4 LT |
1383 | } |
1384 | ||
1385 | ||
1386 | static int | |
1387 | ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length) | |
1388 | { | |
1389 | struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL}; | |
1390 | struct kvec iov; | |
1391 | int len; | |
1392 | ||
1393 | EnterFunction(7); | |
1394 | iov.iov_base = (void *)buffer; | |
1395 | iov.iov_len = length; | |
1396 | ||
1397 | len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length)); | |
1398 | ||
1399 | LeaveFunction(7); | |
1400 | return len; | |
1401 | } | |
1402 | ||
1403 | static void | |
1404 | ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg) | |
1405 | { | |
1406 | int msize; | |
1407 | ||
1408 | msize = msg->size; | |
1409 | ||
1410 | /* Put size in network byte order */ | |
1411 | msg->size = htons(msg->size); | |
1412 | ||
1413 | if (ip_vs_send_async(sock, (char *)msg, msize) != msize) | |
1e3e238e | 1414 | pr_err("ip_vs_send_async error\n"); |
1da177e4 LT |
1415 | } |
1416 | ||
1417 | static int | |
1418 | ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen) | |
1419 | { | |
1420 | struct msghdr msg = {NULL,}; | |
1421 | struct kvec iov; | |
1422 | int len; | |
1423 | ||
1424 | EnterFunction(7); | |
1425 | ||
1426 | /* Receive a packet */ | |
1427 | iov.iov_base = buffer; | |
1428 | iov.iov_len = (size_t)buflen; | |
1429 | ||
1430 | len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, 0); | |
1431 | ||
1432 | if (len < 0) | |
1433 | return -1; | |
1434 | ||
1435 | LeaveFunction(7); | |
1436 | return len; | |
1437 | } | |
1438 | ||
1439 | ||
998e7a76 | 1440 | static int sync_thread_master(void *data) |
1da177e4 | 1441 | { |
998e7a76 | 1442 | struct ip_vs_sync_thread_data *tinfo = data; |
f131315f | 1443 | struct netns_ipvs *ipvs = net_ipvs(tinfo->net); |
1da177e4 LT |
1444 | struct ip_vs_sync_buff *sb; |
1445 | ||
1e3e238e HE |
1446 | pr_info("sync thread started: state = MASTER, mcast_ifn = %s, " |
1447 | "syncid = %d\n", | |
f131315f | 1448 | ipvs->master_mcast_ifn, ipvs->master_syncid); |
1da177e4 | 1449 | |
998e7a76 | 1450 | while (!kthread_should_stop()) { |
f131315f | 1451 | while ((sb = sb_dequeue(ipvs))) { |
998e7a76 | 1452 | ip_vs_send_sync_msg(tinfo->sock, sb->mesg); |
1da177e4 LT |
1453 | ip_vs_sync_buff_release(sb); |
1454 | } | |
1455 | ||
f131315f HS |
1456 | /* check if entries stay in ipvs->sync_buff for 2 seconds */ |
1457 | sb = get_curr_sync_buff(ipvs, 2 * HZ); | |
998e7a76 SW |
1458 | if (sb) { |
1459 | ip_vs_send_sync_msg(tinfo->sock, sb->mesg); | |
1da177e4 LT |
1460 | ip_vs_sync_buff_release(sb); |
1461 | } | |
1462 | ||
375c6bba | 1463 | schedule_timeout_interruptible(HZ); |
1da177e4 LT |
1464 | } |
1465 | ||
1466 | /* clean up the sync_buff queue */ | |
f131315f | 1467 | while ((sb = sb_dequeue(ipvs))) |
1da177e4 | 1468 | ip_vs_sync_buff_release(sb); |
1da177e4 LT |
1469 | |
1470 | /* clean up the current sync_buff */ | |
f131315f HS |
1471 | sb = get_curr_sync_buff(ipvs, 0); |
1472 | if (sb) | |
1da177e4 | 1473 | ip_vs_sync_buff_release(sb); |
1da177e4 LT |
1474 | |
1475 | /* release the sending multicast socket */ | |
998e7a76 SW |
1476 | sock_release(tinfo->sock); |
1477 | kfree(tinfo); | |
1478 | ||
1479 | return 0; | |
1da177e4 LT |
1480 | } |
1481 | ||
1482 | ||
998e7a76 | 1483 | static int sync_thread_backup(void *data) |
1da177e4 | 1484 | { |
998e7a76 | 1485 | struct ip_vs_sync_thread_data *tinfo = data; |
f131315f | 1486 | struct netns_ipvs *ipvs = net_ipvs(tinfo->net); |
1da177e4 LT |
1487 | int len; |
1488 | ||
1e3e238e HE |
1489 | pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, " |
1490 | "syncid = %d\n", | |
f131315f | 1491 | ipvs->backup_mcast_ifn, ipvs->backup_syncid); |
1da177e4 | 1492 | |
998e7a76 | 1493 | while (!kthread_should_stop()) { |
aa395145 | 1494 | wait_event_interruptible(*sk_sleep(tinfo->sock->sk), |
ba6fd850 SW |
1495 | !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue) |
1496 | || kthread_should_stop()); | |
1497 | ||
998e7a76 SW |
1498 | /* do we have data now? */ |
1499 | while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) { | |
1500 | len = ip_vs_receive(tinfo->sock, tinfo->buf, | |
f131315f | 1501 | ipvs->recv_mesg_maxlen); |
998e7a76 | 1502 | if (len <= 0) { |
1e3e238e | 1503 | pr_err("receiving message error\n"); |
1da177e4 LT |
1504 | break; |
1505 | } | |
998e7a76 SW |
1506 | |
1507 | /* disable bottom half, because it accesses the data | |
1da177e4 LT |
1508 | shared by softirq while getting/creating conns */ |
1509 | local_bh_disable(); | |
f131315f | 1510 | ip_vs_process_message(tinfo->net, tinfo->buf, len); |
1da177e4 LT |
1511 | local_bh_enable(); |
1512 | } | |
1da177e4 LT |
1513 | } |
1514 | ||
1515 | /* release the sending multicast socket */ | |
998e7a76 SW |
1516 | sock_release(tinfo->sock); |
1517 | kfree(tinfo->buf); | |
1518 | kfree(tinfo); | |
1da177e4 | 1519 | |
998e7a76 | 1520 | return 0; |
1da177e4 LT |
1521 | } |
1522 | ||
1523 | ||
f131315f | 1524 | int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid) |
1da177e4 | 1525 | { |
998e7a76 SW |
1526 | struct ip_vs_sync_thread_data *tinfo; |
1527 | struct task_struct **realtask, *task; | |
1528 | struct socket *sock; | |
f131315f | 1529 | struct netns_ipvs *ipvs = net_ipvs(net); |
998e7a76 SW |
1530 | char *name, *buf = NULL; |
1531 | int (*threadfn)(void *data); | |
1532 | int result = -ENOMEM; | |
1da177e4 | 1533 | |
1e3e238e | 1534 | IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current)); |
998e7a76 | 1535 | IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n", |
2981bc9a | 1536 | sizeof(struct ip_vs_sync_conn_v0)); |
1da177e4 | 1537 | |
998e7a76 | 1538 | if (state == IP_VS_STATE_MASTER) { |
f131315f | 1539 | if (ipvs->master_thread) |
998e7a76 | 1540 | return -EEXIST; |
1da177e4 | 1541 | |
f131315f HS |
1542 | strlcpy(ipvs->master_mcast_ifn, mcast_ifn, |
1543 | sizeof(ipvs->master_mcast_ifn)); | |
1544 | ipvs->master_syncid = syncid; | |
1545 | realtask = &ipvs->master_thread; | |
1546 | name = "ipvs_master:%d"; | |
998e7a76 | 1547 | threadfn = sync_thread_master; |
f131315f | 1548 | sock = make_send_sock(net); |
998e7a76 | 1549 | } else if (state == IP_VS_STATE_BACKUP) { |
f131315f | 1550 | if (ipvs->backup_thread) |
998e7a76 SW |
1551 | return -EEXIST; |
1552 | ||
f131315f HS |
1553 | strlcpy(ipvs->backup_mcast_ifn, mcast_ifn, |
1554 | sizeof(ipvs->backup_mcast_ifn)); | |
1555 | ipvs->backup_syncid = syncid; | |
1556 | realtask = &ipvs->backup_thread; | |
1557 | name = "ipvs_backup:%d"; | |
998e7a76 | 1558 | threadfn = sync_thread_backup; |
f131315f | 1559 | sock = make_receive_sock(net); |
1da177e4 | 1560 | } else { |
1da177e4 LT |
1561 | return -EINVAL; |
1562 | } | |
1563 | ||
998e7a76 SW |
1564 | if (IS_ERR(sock)) { |
1565 | result = PTR_ERR(sock); | |
1566 | goto out; | |
1567 | } | |
1da177e4 | 1568 | |
f131315f | 1569 | set_sync_mesg_maxlen(net, state); |
998e7a76 | 1570 | if (state == IP_VS_STATE_BACKUP) { |
f131315f | 1571 | buf = kmalloc(ipvs->recv_mesg_maxlen, GFP_KERNEL); |
998e7a76 SW |
1572 | if (!buf) |
1573 | goto outsocket; | |
1574 | } | |
1da177e4 | 1575 | |
998e7a76 SW |
1576 | tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL); |
1577 | if (!tinfo) | |
1578 | goto outbuf; | |
cc0191ae | 1579 | |
f131315f | 1580 | tinfo->net = net; |
998e7a76 SW |
1581 | tinfo->sock = sock; |
1582 | tinfo->buf = buf; | |
1da177e4 | 1583 | |
f131315f | 1584 | task = kthread_run(threadfn, tinfo, name, ipvs->gen); |
998e7a76 SW |
1585 | if (IS_ERR(task)) { |
1586 | result = PTR_ERR(task); | |
1587 | goto outtinfo; | |
1588 | } | |
1da177e4 | 1589 | |
998e7a76 SW |
1590 | /* mark as active */ |
1591 | *realtask = task; | |
f131315f | 1592 | ipvs->sync_state |= state; |
1da177e4 | 1593 | |
998e7a76 SW |
1594 | /* increase the module use count */ |
1595 | ip_vs_use_count_inc(); | |
1da177e4 LT |
1596 | |
1597 | return 0; | |
1da177e4 | 1598 | |
998e7a76 SW |
1599 | outtinfo: |
1600 | kfree(tinfo); | |
1601 | outbuf: | |
1602 | kfree(buf); | |
1603 | outsocket: | |
1604 | sock_release(sock); | |
1605 | out: | |
1606 | return result; | |
1da177e4 LT |
1607 | } |
1608 | ||
1609 | ||
f131315f | 1610 | int stop_sync_thread(struct net *net, int state) |
1da177e4 | 1611 | { |
f131315f HS |
1612 | struct netns_ipvs *ipvs = net_ipvs(net); |
1613 | ||
1e3e238e | 1614 | IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current)); |
1da177e4 | 1615 | |
1da177e4 | 1616 | if (state == IP_VS_STATE_MASTER) { |
f131315f | 1617 | if (!ipvs->master_thread) |
998e7a76 | 1618 | return -ESRCH; |
cc0191ae | 1619 | |
1e3e238e | 1620 | pr_info("stopping master sync thread %d ...\n", |
f131315f | 1621 | task_pid_nr(ipvs->master_thread)); |
1da177e4 | 1622 | |
998e7a76 SW |
1623 | /* |
1624 | * The lock synchronizes with sb_queue_tail(), so that we don't | |
1625 | * add sync buffers to the queue, when we are already in | |
1626 | * progress of stopping the master sync daemon. | |
1627 | */ | |
1da177e4 | 1628 | |
f131315f HS |
1629 | spin_lock_bh(&ipvs->sync_lock); |
1630 | ipvs->sync_state &= ~IP_VS_STATE_MASTER; | |
1631 | spin_unlock_bh(&ipvs->sync_lock); | |
1632 | kthread_stop(ipvs->master_thread); | |
1633 | ipvs->master_thread = NULL; | |
998e7a76 | 1634 | } else if (state == IP_VS_STATE_BACKUP) { |
f131315f | 1635 | if (!ipvs->backup_thread) |
998e7a76 SW |
1636 | return -ESRCH; |
1637 | ||
1e3e238e | 1638 | pr_info("stopping backup sync thread %d ...\n", |
f131315f | 1639 | task_pid_nr(ipvs->backup_thread)); |
998e7a76 | 1640 | |
f131315f HS |
1641 | ipvs->sync_state &= ~IP_VS_STATE_BACKUP; |
1642 | kthread_stop(ipvs->backup_thread); | |
1643 | ipvs->backup_thread = NULL; | |
998e7a76 SW |
1644 | } else { |
1645 | return -EINVAL; | |
1646 | } | |
1da177e4 | 1647 | |
998e7a76 SW |
1648 | /* decrease the module use count */ |
1649 | ip_vs_use_count_dec(); | |
1da177e4 LT |
1650 | |
1651 | return 0; | |
1652 | } | |
61b1ab45 HS |
1653 | |
1654 | /* | |
1655 | * Initialize data struct for each netns | |
1656 | */ | |
1657 | static int __net_init __ip_vs_sync_init(struct net *net) | |
1658 | { | |
f131315f HS |
1659 | struct netns_ipvs *ipvs = net_ipvs(net); |
1660 | ||
f131315f HS |
1661 | INIT_LIST_HEAD(&ipvs->sync_queue); |
1662 | spin_lock_init(&ipvs->sync_lock); | |
1663 | spin_lock_init(&ipvs->sync_buff_lock); | |
1664 | ||
1665 | ipvs->sync_mcast_addr.sin_family = AF_INET; | |
1666 | ipvs->sync_mcast_addr.sin_port = cpu_to_be16(IP_VS_SYNC_PORT); | |
1667 | ipvs->sync_mcast_addr.sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP); | |
61b1ab45 HS |
1668 | return 0; |
1669 | } | |
1670 | ||
1671 | static void __ip_vs_sync_cleanup(struct net *net) | |
1672 | { | |
f131315f HS |
1673 | stop_sync_thread(net, IP_VS_STATE_MASTER); |
1674 | stop_sync_thread(net, IP_VS_STATE_BACKUP); | |
61b1ab45 | 1675 | } |
f131315f | 1676 | |
61b1ab45 HS |
1677 | static struct pernet_operations ipvs_sync_ops = { |
1678 | .init = __ip_vs_sync_init, | |
1679 | .exit = __ip_vs_sync_cleanup, | |
1680 | }; | |
1681 | ||
1682 | ||
1683 | int __init ip_vs_sync_init(void) | |
1684 | { | |
1685 | return register_pernet_subsys(&ipvs_sync_ops); | |
1686 | } | |
1687 | ||
ed3d1e7b | 1688 | void ip_vs_sync_cleanup(void) |
61b1ab45 HS |
1689 | { |
1690 | unregister_pernet_subsys(&ipvs_sync_ops); | |
1691 | } |