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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPVS An implementation of the IP virtual server support for the | |
3 | * LINUX operating system. IPVS is now implemented as a module | |
4 | * over the NetFilter framework. IPVS can be used to build a | |
5 | * high-performance and highly available server based on a | |
6 | * cluster of servers. | |
7 | * | |
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 | 63 | |
ae1d48b2 | 64 | static struct lock_class_key __ipvs_sync_key; |
1da177e4 LT |
65 | /* |
66 | * IPVS sync connection entry | |
2981bc9a | 67 | * Version 0, i.e. original version. |
1da177e4 | 68 | */ |
2981bc9a | 69 | struct ip_vs_sync_conn_v0 { |
1da177e4 LT |
70 | __u8 reserved; |
71 | ||
72 | /* Protocol, addresses and port numbers */ | |
73 | __u8 protocol; /* Which protocol (TCP/UDP) */ | |
014d730d AV |
74 | __be16 cport; |
75 | __be16 vport; | |
76 | __be16 dport; | |
77 | __be32 caddr; /* client address */ | |
78 | __be32 vaddr; /* virtual address */ | |
79 | __be32 daddr; /* destination address */ | |
1da177e4 LT |
80 | |
81 | /* Flags and state transition */ | |
014d730d AV |
82 | __be16 flags; /* status flags */ |
83 | __be16 state; /* state info */ | |
1da177e4 LT |
84 | |
85 | /* The sequence options start here */ | |
86 | }; | |
87 | ||
88 | struct ip_vs_sync_conn_options { | |
89 | struct ip_vs_seq in_seq; /* incoming seq. struct */ | |
90 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ | |
91 | }; | |
92 | ||
2981bc9a HS |
93 | /* |
94 | Sync Connection format (sync_conn) | |
95 | ||
96 | 0 1 2 3 | |
97 | 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 | |
98 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
99 | | Type | Protocol | Ver. | Size | | |
100 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
101 | | Flags | | |
102 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
103 | | State | cport | | |
104 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
105 | | vport | dport | | |
106 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
107 | | fwmark | | |
108 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
109 | | timeout (in sec.) | | |
110 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
111 | | ... | | |
112 | | IP-Addresses (v4 or v6) | | |
113 | | ... | | |
114 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
115 | Optional Parameters. | |
116 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
117 | | Param. Type | Param. Length | Param. data | | |
118 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | |
119 | | ... | | |
120 | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
121 | | | Param Type | Param. Length | | |
122 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
123 | | Param data | | |
124 | | Last Param data should be padded for 32 bit alignment | | |
125 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
126 | */ | |
127 | ||
128 | /* | |
129 | * Type 0, IPv4 sync connection format | |
130 | */ | |
131 | struct ip_vs_sync_v4 { | |
132 | __u8 type; | |
133 | __u8 protocol; /* Which protocol (TCP/UDP) */ | |
134 | __be16 ver_size; /* Version msb 4 bits */ | |
135 | /* Flags and state transition */ | |
136 | __be32 flags; /* status flags */ | |
137 | __be16 state; /* state info */ | |
138 | /* Protocol, addresses and port numbers */ | |
139 | __be16 cport; | |
140 | __be16 vport; | |
141 | __be16 dport; | |
142 | __be32 fwmark; /* Firewall mark from skb */ | |
143 | __be32 timeout; /* cp timeout */ | |
144 | __be32 caddr; /* client address */ | |
145 | __be32 vaddr; /* virtual address */ | |
146 | __be32 daddr; /* destination address */ | |
147 | /* The sequence options start here */ | |
148 | /* PE data padded to 32bit alignment after seq. options */ | |
149 | }; | |
150 | /* | |
151 | * Type 2 messages IPv6 | |
152 | */ | |
153 | struct ip_vs_sync_v6 { | |
154 | __u8 type; | |
155 | __u8 protocol; /* Which protocol (TCP/UDP) */ | |
156 | __be16 ver_size; /* Version msb 4 bits */ | |
157 | /* Flags and state transition */ | |
158 | __be32 flags; /* status flags */ | |
159 | __be16 state; /* state info */ | |
160 | /* Protocol, addresses and port numbers */ | |
161 | __be16 cport; | |
162 | __be16 vport; | |
163 | __be16 dport; | |
164 | __be32 fwmark; /* Firewall mark from skb */ | |
165 | __be32 timeout; /* cp timeout */ | |
166 | struct in6_addr caddr; /* client address */ | |
167 | struct in6_addr vaddr; /* virtual address */ | |
168 | struct in6_addr daddr; /* destination address */ | |
169 | /* The sequence options start here */ | |
170 | /* PE data padded to 32bit alignment after seq. options */ | |
171 | }; | |
172 | ||
173 | union ip_vs_sync_conn { | |
174 | struct ip_vs_sync_v4 v4; | |
175 | struct ip_vs_sync_v6 v6; | |
176 | }; | |
177 | ||
178 | /* Bits in Type field in above */ | |
179 | #define STYPE_INET6 0 | |
180 | #define STYPE_F_INET6 (1 << STYPE_INET6) | |
181 | ||
182 | #define SVER_SHIFT 12 /* Shift to get version */ | |
183 | #define SVER_MASK 0x0fff /* Mask to strip version */ | |
184 | ||
185 | #define IPVS_OPT_SEQ_DATA 1 | |
186 | #define IPVS_OPT_PE_DATA 2 | |
187 | #define IPVS_OPT_PE_NAME 3 | |
188 | #define IPVS_OPT_PARAM 7 | |
189 | ||
190 | #define IPVS_OPT_F_SEQ_DATA (1 << (IPVS_OPT_SEQ_DATA-1)) | |
191 | #define IPVS_OPT_F_PE_DATA (1 << (IPVS_OPT_PE_DATA-1)) | |
192 | #define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME-1)) | |
193 | #define IPVS_OPT_F_PARAM (1 << (IPVS_OPT_PARAM-1)) | |
194 | ||
cc0191ae | 195 | struct ip_vs_sync_thread_data { |
f131315f | 196 | struct net *net; |
998e7a76 SW |
197 | struct socket *sock; |
198 | char *buf; | |
f73181c8 | 199 | int id; |
cc0191ae NH |
200 | }; |
201 | ||
2981bc9a HS |
202 | /* Version 0 definition of packet sizes */ |
203 | #define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0)) | |
1da177e4 | 204 | #define FULL_CONN_SIZE \ |
2981bc9a | 205 | (sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options)) |
1da177e4 LT |
206 | |
207 | ||
208 | /* | |
2981bc9a HS |
209 | The master mulitcasts messages (Datagrams) to the backup load balancers |
210 | in the following format. | |
211 | ||
212 | Version 1: | |
213 | Note, first byte should be Zero, so ver 0 receivers will drop the packet. | |
1da177e4 LT |
214 | |
215 | 0 1 2 3 | |
216 | 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 | |
217 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2981bc9a HS |
218 | | 0 | SyncID | Size | |
219 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
220 | | Count Conns | Version | Reserved, set to Zero | | |
1da177e4 LT |
221 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
222 | | | | |
223 | | IPVS Sync Connection (1) | | |
224 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
225 | | . | | |
2981bc9a | 226 | ~ . ~ |
1da177e4 LT |
227 | | . | |
228 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
229 | | | | |
230 | | IPVS Sync Connection (n) | | |
231 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
2981bc9a HS |
232 | |
233 | Version 0 Header | |
234 | 0 1 2 3 | |
235 | 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 | |
236 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
237 | | Count Conns | SyncID | Size | | |
238 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
239 | | IPVS Sync Connection (1) | | |
1da177e4 LT |
240 | */ |
241 | ||
242 | #define SYNC_MESG_HEADER_LEN 4 | |
e6f225eb | 243 | #define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */ |
1da177e4 | 244 | |
2981bc9a | 245 | /* Version 0 header */ |
986a0757 | 246 | struct ip_vs_sync_mesg_v0 { |
1da177e4 LT |
247 | __u8 nr_conns; |
248 | __u8 syncid; | |
38561437 | 249 | __be16 size; |
1da177e4 LT |
250 | |
251 | /* ip_vs_sync_conn entries start here */ | |
252 | }; | |
253 | ||
2981bc9a | 254 | /* Version 1 header */ |
986a0757 | 255 | struct ip_vs_sync_mesg { |
2981bc9a HS |
256 | __u8 reserved; /* must be zero */ |
257 | __u8 syncid; | |
38561437 | 258 | __be16 size; |
2981bc9a HS |
259 | __u8 nr_conns; |
260 | __s8 version; /* SYNC_PROTO_VER */ | |
261 | __u16 spare; | |
262 | /* ip_vs_sync_conn entries start here */ | |
263 | }; | |
264 | ||
1da177e4 LT |
265 | struct ip_vs_sync_buff { |
266 | struct list_head list; | |
267 | unsigned long firstuse; | |
268 | ||
269 | /* pointers for the message data */ | |
270 | struct ip_vs_sync_mesg *mesg; | |
271 | unsigned char *head; | |
272 | unsigned char *end; | |
273 | }; | |
274 | ||
fe5e7a1e HS |
275 | /* |
276 | * Copy of struct ip_vs_seq | |
277 | * From unaligned network order to aligned host order | |
278 | */ | |
279 | static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho) | |
280 | { | |
281 | ho->init_seq = get_unaligned_be32(&no->init_seq); | |
282 | ho->delta = get_unaligned_be32(&no->delta); | |
283 | ho->previous_delta = get_unaligned_be32(&no->previous_delta); | |
284 | } | |
1da177e4 | 285 | |
986a0757 HS |
286 | /* |
287 | * Copy of struct ip_vs_seq | |
288 | * From Aligned host order to unaligned network order | |
289 | */ | |
290 | static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no) | |
291 | { | |
292 | put_unaligned_be32(ho->init_seq, &no->init_seq); | |
293 | put_unaligned_be32(ho->delta, &no->delta); | |
294 | put_unaligned_be32(ho->previous_delta, &no->previous_delta); | |
295 | } | |
296 | ||
f73181c8 PNA |
297 | static inline struct ip_vs_sync_buff * |
298 | sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms) | |
1da177e4 LT |
299 | { |
300 | struct ip_vs_sync_buff *sb; | |
301 | ||
f131315f | 302 | spin_lock_bh(&ipvs->sync_lock); |
f73181c8 | 303 | if (list_empty(&ms->sync_queue)) { |
1da177e4 | 304 | sb = NULL; |
1c003b15 | 305 | __set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 306 | } else { |
f73181c8 | 307 | sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff, |
1da177e4 LT |
308 | list); |
309 | list_del(&sb->list); | |
f73181c8 PNA |
310 | ms->sync_queue_len--; |
311 | if (!ms->sync_queue_len) | |
312 | ms->sync_queue_delay = 0; | |
1da177e4 | 313 | } |
f131315f | 314 | spin_unlock_bh(&ipvs->sync_lock); |
1da177e4 LT |
315 | |
316 | return sb; | |
317 | } | |
318 | ||
986a0757 HS |
319 | /* |
320 | * Create a new sync buffer for Version 1 proto. | |
321 | */ | |
f131315f HS |
322 | static inline struct ip_vs_sync_buff * |
323 | ip_vs_sync_buff_create(struct netns_ipvs *ipvs) | |
1da177e4 LT |
324 | { |
325 | struct ip_vs_sync_buff *sb; | |
326 | ||
327 | if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC))) | |
328 | return NULL; | |
329 | ||
f131315f HS |
330 | sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC); |
331 | if (!sb->mesg) { | |
1da177e4 LT |
332 | kfree(sb); |
333 | return NULL; | |
334 | } | |
f73181c8 | 335 | sb->mesg->reserved = 0; /* old nr_conns i.e. must be zero now */ |
986a0757 | 336 | sb->mesg->version = SYNC_PROTO_VER; |
f131315f | 337 | sb->mesg->syncid = ipvs->master_syncid; |
38561437 | 338 | sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg)); |
986a0757 HS |
339 | sb->mesg->nr_conns = 0; |
340 | sb->mesg->spare = 0; | |
341 | sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg); | |
f131315f | 342 | sb->end = (unsigned char *)sb->mesg + ipvs->send_mesg_maxlen; |
986a0757 | 343 | |
1da177e4 LT |
344 | sb->firstuse = jiffies; |
345 | return sb; | |
346 | } | |
347 | ||
348 | static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb) | |
349 | { | |
350 | kfree(sb->mesg); | |
351 | kfree(sb); | |
352 | } | |
353 | ||
f73181c8 PNA |
354 | static inline void sb_queue_tail(struct netns_ipvs *ipvs, |
355 | struct ipvs_master_sync_state *ms) | |
998e7a76 | 356 | { |
f73181c8 | 357 | struct ip_vs_sync_buff *sb = ms->sync_buff; |
f131315f HS |
358 | |
359 | spin_lock(&ipvs->sync_lock); | |
1c003b15 | 360 | if (ipvs->sync_state & IP_VS_STATE_MASTER && |
f73181c8 PNA |
361 | ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) { |
362 | if (!ms->sync_queue_len) | |
363 | schedule_delayed_work(&ms->master_wakeup_work, | |
1c003b15 | 364 | max(IPVS_SYNC_SEND_DELAY, 1)); |
f73181c8 PNA |
365 | ms->sync_queue_len++; |
366 | list_add_tail(&sb->list, &ms->sync_queue); | |
367 | if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE) | |
368 | wake_up_process(ms->master_thread); | |
1c003b15 | 369 | } else |
998e7a76 | 370 | ip_vs_sync_buff_release(sb); |
f131315f | 371 | spin_unlock(&ipvs->sync_lock); |
998e7a76 SW |
372 | } |
373 | ||
1da177e4 LT |
374 | /* |
375 | * Get the current sync buffer if it has been created for more | |
376 | * than the specified time or the specified time is zero. | |
377 | */ | |
378 | static inline struct ip_vs_sync_buff * | |
f73181c8 PNA |
379 | get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms, |
380 | unsigned long time) | |
1da177e4 LT |
381 | { |
382 | struct ip_vs_sync_buff *sb; | |
383 | ||
f131315f | 384 | spin_lock_bh(&ipvs->sync_buff_lock); |
f73181c8 PNA |
385 | sb = ms->sync_buff; |
386 | if (sb && time_after_eq(jiffies - sb->firstuse, time)) { | |
387 | ms->sync_buff = NULL; | |
1c003b15 | 388 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
389 | } else |
390 | sb = NULL; | |
f131315f | 391 | spin_unlock_bh(&ipvs->sync_buff_lock); |
1da177e4 LT |
392 | return sb; |
393 | } | |
394 | ||
f73181c8 PNA |
395 | static inline int |
396 | select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp) | |
f131315f | 397 | { |
f73181c8 | 398 | return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask; |
b880c1f0 HS |
399 | } |
400 | ||
401 | /* | |
402 | * Create a new sync buffer for Version 0 proto. | |
403 | */ | |
f131315f HS |
404 | static inline struct ip_vs_sync_buff * |
405 | ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs) | |
b880c1f0 HS |
406 | { |
407 | struct ip_vs_sync_buff *sb; | |
408 | struct ip_vs_sync_mesg_v0 *mesg; | |
409 | ||
410 | if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC))) | |
411 | return NULL; | |
412 | ||
f131315f HS |
413 | sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC); |
414 | if (!sb->mesg) { | |
b880c1f0 HS |
415 | kfree(sb); |
416 | return NULL; | |
417 | } | |
418 | mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg; | |
419 | mesg->nr_conns = 0; | |
f131315f | 420 | mesg->syncid = ipvs->master_syncid; |
38561437 | 421 | mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0)); |
f131315f HS |
422 | sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0); |
423 | sb->end = (unsigned char *)mesg + ipvs->send_mesg_maxlen; | |
b880c1f0 HS |
424 | sb->firstuse = jiffies; |
425 | return sb; | |
426 | } | |
427 | ||
4d0c875d JA |
428 | /* Check if connection is controlled by persistence */ |
429 | static inline bool in_persistence(struct ip_vs_conn *cp) | |
430 | { | |
431 | for (cp = cp->control; cp; cp = cp->control) { | |
432 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) | |
433 | return true; | |
434 | } | |
435 | return false; | |
436 | } | |
437 | ||
749c42b6 JA |
438 | /* Check if conn should be synced. |
439 | * pkts: conn packets, use sysctl_sync_threshold to avoid packet check | |
440 | * - (1) sync_refresh_period: reduce sync rate. Additionally, retry | |
441 | * sync_retries times with period of sync_refresh_period/8 | |
442 | * - (2) if both sync_refresh_period and sync_period are 0 send sync only | |
443 | * for state changes or only once when pkts matches sync_threshold | |
444 | * - (3) templates: rate can be reduced only with sync_refresh_period or | |
445 | * with (2) | |
446 | */ | |
447 | static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs, | |
448 | struct ip_vs_conn *cp, int pkts) | |
449 | { | |
450 | unsigned long orig = ACCESS_ONCE(cp->sync_endtime); | |
451 | unsigned long now = jiffies; | |
452 | unsigned long n = (now + cp->timeout) & ~3UL; | |
453 | unsigned int sync_refresh_period; | |
454 | int sync_period; | |
455 | int force; | |
456 | ||
457 | /* Check if we sync in current state */ | |
458 | if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE)) | |
459 | force = 0; | |
4d0c875d JA |
460 | else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp))) |
461 | return 0; | |
749c42b6 JA |
462 | else if (likely(cp->protocol == IPPROTO_TCP)) { |
463 | if (!((1 << cp->state) & | |
464 | ((1 << IP_VS_TCP_S_ESTABLISHED) | | |
465 | (1 << IP_VS_TCP_S_FIN_WAIT) | | |
466 | (1 << IP_VS_TCP_S_CLOSE) | | |
467 | (1 << IP_VS_TCP_S_CLOSE_WAIT) | | |
468 | (1 << IP_VS_TCP_S_TIME_WAIT)))) | |
469 | return 0; | |
470 | force = cp->state != cp->old_state; | |
471 | if (force && cp->state != IP_VS_TCP_S_ESTABLISHED) | |
472 | goto set; | |
473 | } else if (unlikely(cp->protocol == IPPROTO_SCTP)) { | |
474 | if (!((1 << cp->state) & | |
475 | ((1 << IP_VS_SCTP_S_ESTABLISHED) | | |
61e7c420 JA |
476 | (1 << IP_VS_SCTP_S_SHUTDOWN_SENT) | |
477 | (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) | | |
478 | (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) | | |
479 | (1 << IP_VS_SCTP_S_CLOSED)))) | |
749c42b6 JA |
480 | return 0; |
481 | force = cp->state != cp->old_state; | |
482 | if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED) | |
483 | goto set; | |
484 | } else { | |
485 | /* UDP or another protocol with single state */ | |
486 | force = 0; | |
487 | } | |
488 | ||
489 | sync_refresh_period = sysctl_sync_refresh_period(ipvs); | |
490 | if (sync_refresh_period > 0) { | |
491 | long diff = n - orig; | |
492 | long min_diff = max(cp->timeout >> 1, 10UL * HZ); | |
493 | ||
494 | /* Avoid sync if difference is below sync_refresh_period | |
495 | * and below the half timeout. | |
496 | */ | |
497 | if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) { | |
498 | int retries = orig & 3; | |
499 | ||
500 | if (retries >= sysctl_sync_retries(ipvs)) | |
501 | return 0; | |
502 | if (time_before(now, orig - cp->timeout + | |
503 | (sync_refresh_period >> 3))) | |
504 | return 0; | |
505 | n |= retries + 1; | |
506 | } | |
507 | } | |
508 | sync_period = sysctl_sync_period(ipvs); | |
509 | if (sync_period > 0) { | |
510 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) && | |
511 | pkts % sync_period != sysctl_sync_threshold(ipvs)) | |
512 | return 0; | |
513 | } else if (sync_refresh_period <= 0 && | |
514 | pkts != sysctl_sync_threshold(ipvs)) | |
515 | return 0; | |
516 | ||
517 | set: | |
518 | cp->old_state = cp->state; | |
519 | n = cmpxchg(&cp->sync_endtime, orig, n); | |
520 | return n == orig || force; | |
521 | } | |
522 | ||
b880c1f0 HS |
523 | /* |
524 | * Version 0 , could be switched in by sys_ctl. | |
525 | * Add an ip_vs_conn information into the current sync_buff. | |
526 | */ | |
749c42b6 JA |
527 | static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp, |
528 | int pkts) | |
b880c1f0 | 529 | { |
f131315f | 530 | struct netns_ipvs *ipvs = net_ipvs(net); |
b880c1f0 HS |
531 | struct ip_vs_sync_mesg_v0 *m; |
532 | struct ip_vs_sync_conn_v0 *s; | |
f73181c8 PNA |
533 | struct ip_vs_sync_buff *buff; |
534 | struct ipvs_master_sync_state *ms; | |
535 | int id; | |
b880c1f0 HS |
536 | int len; |
537 | ||
538 | if (unlikely(cp->af != AF_INET)) | |
539 | return; | |
540 | /* Do not sync ONE PACKET */ | |
541 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) | |
542 | return; | |
543 | ||
749c42b6 JA |
544 | if (!ip_vs_sync_conn_needed(ipvs, cp, pkts)) |
545 | return; | |
546 | ||
ac69269a | 547 | spin_lock_bh(&ipvs->sync_buff_lock); |
f73181c8 | 548 | if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) { |
ac69269a | 549 | spin_unlock_bh(&ipvs->sync_buff_lock); |
f73181c8 PNA |
550 | return; |
551 | } | |
552 | ||
553 | id = select_master_thread_id(ipvs, cp); | |
554 | ms = &ipvs->ms[id]; | |
555 | buff = ms->sync_buff; | |
556 | if (buff) { | |
557 | m = (struct ip_vs_sync_mesg_v0 *) buff->mesg; | |
558 | /* Send buffer if it is for v1 */ | |
559 | if (!m->nr_conns) { | |
560 | sb_queue_tail(ipvs, ms); | |
561 | ms->sync_buff = NULL; | |
562 | buff = NULL; | |
563 | } | |
564 | } | |
565 | if (!buff) { | |
566 | buff = ip_vs_sync_buff_create_v0(ipvs); | |
567 | if (!buff) { | |
ac69269a | 568 | spin_unlock_bh(&ipvs->sync_buff_lock); |
b880c1f0 HS |
569 | pr_err("ip_vs_sync_buff_create failed.\n"); |
570 | return; | |
571 | } | |
f73181c8 | 572 | ms->sync_buff = buff; |
b880c1f0 HS |
573 | } |
574 | ||
575 | len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE : | |
576 | SIMPLE_CONN_SIZE; | |
f73181c8 PNA |
577 | m = (struct ip_vs_sync_mesg_v0 *) buff->mesg; |
578 | s = (struct ip_vs_sync_conn_v0 *) buff->head; | |
b880c1f0 HS |
579 | |
580 | /* copy members */ | |
581 | s->reserved = 0; | |
582 | s->protocol = cp->protocol; | |
583 | s->cport = cp->cport; | |
584 | s->vport = cp->vport; | |
585 | s->dport = cp->dport; | |
586 | s->caddr = cp->caddr.ip; | |
587 | s->vaddr = cp->vaddr.ip; | |
588 | s->daddr = cp->daddr.ip; | |
589 | s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED); | |
590 | s->state = htons(cp->state); | |
591 | if (cp->flags & IP_VS_CONN_F_SEQ_MASK) { | |
592 | struct ip_vs_sync_conn_options *opt = | |
593 | (struct ip_vs_sync_conn_options *)&s[1]; | |
594 | memcpy(opt, &cp->in_seq, sizeof(*opt)); | |
595 | } | |
596 | ||
597 | m->nr_conns++; | |
38561437 | 598 | m->size = htons(ntohs(m->size) + len); |
f73181c8 | 599 | buff->head += len; |
b880c1f0 HS |
600 | |
601 | /* check if there is a space for next one */ | |
f73181c8 PNA |
602 | if (buff->head + FULL_CONN_SIZE > buff->end) { |
603 | sb_queue_tail(ipvs, ms); | |
604 | ms->sync_buff = NULL; | |
b880c1f0 | 605 | } |
ac69269a | 606 | spin_unlock_bh(&ipvs->sync_buff_lock); |
b880c1f0 HS |
607 | |
608 | /* synchronize its controller if it has */ | |
749c42b6 JA |
609 | cp = cp->control; |
610 | if (cp) { | |
611 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) | |
612 | pkts = atomic_add_return(1, &cp->in_pkts); | |
613 | else | |
614 | pkts = sysctl_sync_threshold(ipvs); | |
56184858 | 615 | ip_vs_sync_conn(net, cp, pkts); |
749c42b6 | 616 | } |
b880c1f0 HS |
617 | } |
618 | ||
1da177e4 LT |
619 | /* |
620 | * Add an ip_vs_conn information into the current sync_buff. | |
621 | * Called by ip_vs_in. | |
986a0757 | 622 | * Sending Version 1 messages |
1da177e4 | 623 | */ |
749c42b6 | 624 | void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts) |
1da177e4 | 625 | { |
f131315f | 626 | struct netns_ipvs *ipvs = net_ipvs(net); |
1da177e4 | 627 | struct ip_vs_sync_mesg *m; |
986a0757 | 628 | union ip_vs_sync_conn *s; |
f73181c8 PNA |
629 | struct ip_vs_sync_buff *buff; |
630 | struct ipvs_master_sync_state *ms; | |
631 | int id; | |
986a0757 HS |
632 | __u8 *p; |
633 | unsigned int len, pe_name_len, pad; | |
634 | ||
b880c1f0 | 635 | /* Handle old version of the protocol */ |
7532e8d4 | 636 | if (sysctl_sync_ver(ipvs) == 0) { |
749c42b6 | 637 | ip_vs_sync_conn_v0(net, cp, pkts); |
b880c1f0 HS |
638 | return; |
639 | } | |
986a0757 HS |
640 | /* Do not sync ONE PACKET */ |
641 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) | |
642 | goto control; | |
643 | sloop: | |
749c42b6 JA |
644 | if (!ip_vs_sync_conn_needed(ipvs, cp, pkts)) |
645 | goto control; | |
646 | ||
986a0757 HS |
647 | /* Sanity checks */ |
648 | pe_name_len = 0; | |
649 | if (cp->pe_data_len) { | |
650 | if (!cp->pe_data || !cp->dest) { | |
651 | IP_VS_ERR_RL("SYNC, connection pe_data invalid\n"); | |
652 | return; | |
653 | } | |
654 | pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN); | |
655 | } | |
1da177e4 | 656 | |
ac69269a | 657 | spin_lock_bh(&ipvs->sync_buff_lock); |
f73181c8 | 658 | if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) { |
ac69269a | 659 | spin_unlock_bh(&ipvs->sync_buff_lock); |
f73181c8 PNA |
660 | return; |
661 | } | |
662 | ||
663 | id = select_master_thread_id(ipvs, cp); | |
664 | ms = &ipvs->ms[id]; | |
986a0757 HS |
665 | |
666 | #ifdef CONFIG_IP_VS_IPV6 | |
667 | if (cp->af == AF_INET6) | |
668 | len = sizeof(struct ip_vs_sync_v6); | |
669 | else | |
670 | #endif | |
671 | len = sizeof(struct ip_vs_sync_v4); | |
672 | ||
673 | if (cp->flags & IP_VS_CONN_F_SEQ_MASK) | |
674 | len += sizeof(struct ip_vs_sync_conn_options) + 2; | |
675 | ||
676 | if (cp->pe_data_len) | |
677 | len += cp->pe_data_len + 2; /* + Param hdr field */ | |
678 | if (pe_name_len) | |
679 | len += pe_name_len + 2; | |
680 | ||
681 | /* check if there is a space for this one */ | |
682 | pad = 0; | |
f73181c8 PNA |
683 | buff = ms->sync_buff; |
684 | if (buff) { | |
685 | m = buff->mesg; | |
686 | pad = (4 - (size_t) buff->head) & 3; | |
687 | /* Send buffer if it is for v0 */ | |
688 | if (buff->head + len + pad > buff->end || m->reserved) { | |
689 | sb_queue_tail(ipvs, ms); | |
690 | ms->sync_buff = NULL; | |
691 | buff = NULL; | |
986a0757 HS |
692 | pad = 0; |
693 | } | |
694 | } | |
695 | ||
f73181c8 PNA |
696 | if (!buff) { |
697 | buff = ip_vs_sync_buff_create(ipvs); | |
698 | if (!buff) { | |
ac69269a | 699 | spin_unlock_bh(&ipvs->sync_buff_lock); |
1e3e238e | 700 | pr_err("ip_vs_sync_buff_create failed.\n"); |
1da177e4 LT |
701 | return; |
702 | } | |
f73181c8 PNA |
703 | ms->sync_buff = buff; |
704 | m = buff->mesg; | |
1da177e4 LT |
705 | } |
706 | ||
f73181c8 PNA |
707 | p = buff->head; |
708 | buff->head += pad + len; | |
38561437 | 709 | m->size = htons(ntohs(m->size) + pad + len); |
986a0757 HS |
710 | /* Add ev. padding from prev. sync_conn */ |
711 | while (pad--) | |
712 | *(p++) = 0; | |
713 | ||
714 | s = (union ip_vs_sync_conn *)p; | |
715 | ||
716 | /* Set message type & copy members */ | |
717 | s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0); | |
718 | s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */ | |
719 | s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED); | |
720 | s->v4.state = htons(cp->state); | |
721 | s->v4.protocol = cp->protocol; | |
722 | s->v4.cport = cp->cport; | |
723 | s->v4.vport = cp->vport; | |
724 | s->v4.dport = cp->dport; | |
725 | s->v4.fwmark = htonl(cp->fwmark); | |
726 | s->v4.timeout = htonl(cp->timeout / HZ); | |
1da177e4 | 727 | m->nr_conns++; |
1da177e4 | 728 | |
986a0757 HS |
729 | #ifdef CONFIG_IP_VS_IPV6 |
730 | if (cp->af == AF_INET6) { | |
731 | p += sizeof(struct ip_vs_sync_v6); | |
4e3fd7a0 AD |
732 | s->v6.caddr = cp->caddr.in6; |
733 | s->v6.vaddr = cp->vaddr.in6; | |
734 | s->v6.daddr = cp->daddr.in6; | |
986a0757 HS |
735 | } else |
736 | #endif | |
737 | { | |
738 | p += sizeof(struct ip_vs_sync_v4); /* options ptr */ | |
739 | s->v4.caddr = cp->caddr.ip; | |
740 | s->v4.vaddr = cp->vaddr.ip; | |
741 | s->v4.daddr = cp->daddr.ip; | |
742 | } | |
743 | if (cp->flags & IP_VS_CONN_F_SEQ_MASK) { | |
744 | *(p++) = IPVS_OPT_SEQ_DATA; | |
745 | *(p++) = sizeof(struct ip_vs_sync_conn_options); | |
746 | hton_seq((struct ip_vs_seq *)p, &cp->in_seq); | |
747 | p += sizeof(struct ip_vs_seq); | |
748 | hton_seq((struct ip_vs_seq *)p, &cp->out_seq); | |
749 | p += sizeof(struct ip_vs_seq); | |
1da177e4 | 750 | } |
986a0757 HS |
751 | /* Handle pe data */ |
752 | if (cp->pe_data_len && cp->pe_data) { | |
753 | *(p++) = IPVS_OPT_PE_DATA; | |
754 | *(p++) = cp->pe_data_len; | |
755 | memcpy(p, cp->pe_data, cp->pe_data_len); | |
756 | p += cp->pe_data_len; | |
757 | if (pe_name_len) { | |
758 | /* Add PE_NAME */ | |
759 | *(p++) = IPVS_OPT_PE_NAME; | |
760 | *(p++) = pe_name_len; | |
761 | memcpy(p, cp->pe->name, pe_name_len); | |
762 | p += pe_name_len; | |
763 | } | |
764 | } | |
765 | ||
ac69269a | 766 | spin_unlock_bh(&ipvs->sync_buff_lock); |
1da177e4 | 767 | |
986a0757 | 768 | control: |
1da177e4 | 769 | /* synchronize its controller if it has */ |
986a0757 HS |
770 | cp = cp->control; |
771 | if (!cp) | |
772 | return; | |
749c42b6 JA |
773 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) |
774 | pkts = atomic_add_return(1, &cp->in_pkts); | |
775 | else | |
776 | pkts = sysctl_sync_threshold(ipvs); | |
986a0757 | 777 | goto sloop; |
1da177e4 LT |
778 | } |
779 | ||
fe5e7a1e HS |
780 | /* |
781 | * fill_param used by version 1 | |
782 | */ | |
85999283 | 783 | static inline int |
6e67e586 | 784 | ip_vs_conn_fill_param_sync(struct net *net, int af, union ip_vs_sync_conn *sc, |
fe5e7a1e HS |
785 | struct ip_vs_conn_param *p, |
786 | __u8 *pe_data, unsigned int pe_data_len, | |
787 | __u8 *pe_name, unsigned int pe_name_len) | |
85999283 | 788 | { |
fe5e7a1e HS |
789 | #ifdef CONFIG_IP_VS_IPV6 |
790 | if (af == AF_INET6) | |
6e67e586 | 791 | ip_vs_conn_fill_param(net, af, sc->v6.protocol, |
fe5e7a1e HS |
792 | (const union nf_inet_addr *)&sc->v6.caddr, |
793 | sc->v6.cport, | |
794 | (const union nf_inet_addr *)&sc->v6.vaddr, | |
795 | sc->v6.vport, p); | |
796 | else | |
797 | #endif | |
6e67e586 | 798 | ip_vs_conn_fill_param(net, af, sc->v4.protocol, |
fe5e7a1e HS |
799 | (const union nf_inet_addr *)&sc->v4.caddr, |
800 | sc->v4.cport, | |
801 | (const union nf_inet_addr *)&sc->v4.vaddr, | |
802 | sc->v4.vport, p); | |
803 | /* Handle pe data */ | |
804 | if (pe_data_len) { | |
805 | if (pe_name_len) { | |
806 | char buff[IP_VS_PENAME_MAXLEN+1]; | |
807 | ||
808 | memcpy(buff, pe_name, pe_name_len); | |
809 | buff[pe_name_len]=0; | |
810 | p->pe = __ip_vs_pe_getbyname(buff); | |
811 | if (!p->pe) { | |
f131315f HS |
812 | IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n", |
813 | buff); | |
fe5e7a1e HS |
814 | return 1; |
815 | } | |
816 | } else { | |
817 | IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n"); | |
818 | return 1; | |
819 | } | |
820 | ||
6060c74a | 821 | p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC); |
fe5e7a1e | 822 | if (!p->pe_data) { |
982f4051 | 823 | module_put(p->pe->module); |
fe5e7a1e HS |
824 | return -ENOMEM; |
825 | } | |
fe5e7a1e HS |
826 | p->pe_data_len = pe_data_len; |
827 | } | |
85999283 SH |
828 | return 0; |
829 | } | |
1da177e4 LT |
830 | |
831 | /* | |
fe5e7a1e HS |
832 | * Connection Add / Update. |
833 | * Common for version 0 and 1 reception of backup sync_conns. | |
834 | * Param: ... | |
835 | * timeout is in sec. | |
1da177e4 | 836 | */ |
9bbac6a9 HS |
837 | static void ip_vs_proc_conn(struct net *net, struct ip_vs_conn_param *param, |
838 | unsigned int flags, unsigned int state, | |
839 | unsigned int protocol, unsigned int type, | |
fe5e7a1e HS |
840 | const union nf_inet_addr *daddr, __be16 dport, |
841 | unsigned long timeout, __u32 fwmark, | |
9bbac6a9 | 842 | struct ip_vs_sync_conn_options *opt) |
fe5e7a1e HS |
843 | { |
844 | struct ip_vs_dest *dest; | |
845 | struct ip_vs_conn *cp; | |
a0840e2e | 846 | struct netns_ipvs *ipvs = net_ipvs(net); |
fe5e7a1e | 847 | |
d752c364 | 848 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) { |
fe5e7a1e | 849 | cp = ip_vs_conn_in_get(param); |
d752c364 MRL |
850 | if (cp && ((cp->dport != dport) || |
851 | !ip_vs_addr_equal(cp->daf, &cp->daddr, daddr))) { | |
852 | if (!(flags & IP_VS_CONN_F_INACTIVE)) { | |
853 | ip_vs_conn_expire_now(cp); | |
854 | __ip_vs_conn_put(cp); | |
855 | cp = NULL; | |
856 | } else { | |
857 | /* This is the expiration message for the | |
858 | * connection that was already replaced, so we | |
859 | * just ignore it. | |
860 | */ | |
861 | __ip_vs_conn_put(cp); | |
862 | kfree(param->pe_data); | |
863 | return; | |
864 | } | |
865 | } | |
866 | } else { | |
fe5e7a1e | 867 | cp = ip_vs_ct_in_get(param); |
d752c364 | 868 | } |
fe5e7a1e | 869 | |
cdcc5e90 JA |
870 | if (cp) { |
871 | /* Free pe_data */ | |
fe5e7a1e | 872 | kfree(param->pe_data); |
cdcc5e90 JA |
873 | |
874 | dest = cp->dest; | |
ac69269a | 875 | spin_lock_bh(&cp->lock); |
cdcc5e90 JA |
876 | if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE && |
877 | !(flags & IP_VS_CONN_F_TEMPLATE) && dest) { | |
878 | if (flags & IP_VS_CONN_F_INACTIVE) { | |
879 | atomic_dec(&dest->activeconns); | |
880 | atomic_inc(&dest->inactconns); | |
881 | } else { | |
882 | atomic_inc(&dest->activeconns); | |
883 | atomic_dec(&dest->inactconns); | |
884 | } | |
885 | } | |
886 | flags &= IP_VS_CONN_F_BACKUP_UPD_MASK; | |
887 | flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK; | |
888 | cp->flags = flags; | |
ac69269a | 889 | spin_unlock_bh(&cp->lock); |
413c2d04 JA |
890 | if (!dest) |
891 | ip_vs_try_bind_dest(cp); | |
cdcc5e90 | 892 | } else { |
fe5e7a1e HS |
893 | /* |
894 | * Find the appropriate destination for the connection. | |
895 | * If it is not found the connection will remain unbound | |
896 | * but still handled. | |
897 | */ | |
413c2d04 | 898 | rcu_read_lock(); |
655eef10 AG |
899 | /* This function is only invoked by the synchronization |
900 | * code. We do not currently support heterogeneous pools | |
901 | * with synchronization, so we can make the assumption that | |
902 | * the svc_af is the same as the dest_af | |
903 | */ | |
904 | dest = ip_vs_find_dest(net, type, type, daddr, dport, | |
905 | param->vaddr, param->vport, protocol, | |
906 | fwmark, flags); | |
fe5e7a1e | 907 | |
ba38528a AG |
908 | cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest, |
909 | fwmark); | |
413c2d04 | 910 | rcu_read_unlock(); |
fe5e7a1e | 911 | if (!cp) { |
b734427a | 912 | kfree(param->pe_data); |
fe5e7a1e HS |
913 | IP_VS_DBG(2, "BACKUP, add new conn. failed\n"); |
914 | return; | |
915 | } | |
528c943f JA |
916 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) |
917 | kfree(param->pe_data); | |
fe5e7a1e HS |
918 | } |
919 | ||
920 | if (opt) | |
921 | memcpy(&cp->in_seq, opt, sizeof(*opt)); | |
59e0350e | 922 | atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs)); |
fe5e7a1e HS |
923 | cp->state = state; |
924 | cp->old_state = cp->state; | |
925 | /* | |
926 | * For Ver 0 messages style | |
927 | * - Not possible to recover the right timeout for templates | |
928 | * - can not find the right fwmark | |
929 | * virtual service. If needed, we can do it for | |
930 | * non-fwmark persistent services. | |
931 | * Ver 1 messages style. | |
932 | * - No problem. | |
933 | */ | |
934 | if (timeout) { | |
935 | if (timeout > MAX_SCHEDULE_TIMEOUT / HZ) | |
936 | timeout = MAX_SCHEDULE_TIMEOUT / HZ; | |
937 | cp->timeout = timeout*HZ; | |
9bbac6a9 HS |
938 | } else { |
939 | struct ip_vs_proto_data *pd; | |
940 | ||
941 | pd = ip_vs_proto_data_get(net, protocol); | |
942 | if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table) | |
943 | cp->timeout = pd->timeout_table[state]; | |
944 | else | |
945 | cp->timeout = (3*60*HZ); | |
946 | } | |
fe5e7a1e HS |
947 | ip_vs_conn_put(cp); |
948 | } | |
949 | ||
950 | /* | |
951 | * Process received multicast message for Version 0 | |
952 | */ | |
9bbac6a9 HS |
953 | static void ip_vs_process_message_v0(struct net *net, const char *buffer, |
954 | const size_t buflen) | |
1da177e4 | 955 | { |
986a0757 | 956 | struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer; |
2981bc9a | 957 | struct ip_vs_sync_conn_v0 *s; |
1da177e4 | 958 | struct ip_vs_sync_conn_options *opt; |
5c81833c | 959 | struct ip_vs_protocol *pp; |
f11017ec | 960 | struct ip_vs_conn_param param; |
1da177e4 LT |
961 | char *p; |
962 | int i; | |
963 | ||
986a0757 | 964 | p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0); |
1da177e4 | 965 | for (i=0; i<m->nr_conns; i++) { |
95c96174 | 966 | unsigned int flags, state; |
87375ab4 | 967 | |
2ad17def | 968 | if (p + SIMPLE_CONN_SIZE > buffer+buflen) { |
fe5e7a1e | 969 | IP_VS_ERR_RL("BACKUP v0, bogus conn\n"); |
2ad17def JA |
970 | return; |
971 | } | |
2981bc9a | 972 | s = (struct ip_vs_sync_conn_v0 *) p; |
7a4fbb1f | 973 | flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC; |
2ad17def JA |
974 | flags &= ~IP_VS_CONN_F_HASHED; |
975 | if (flags & IP_VS_CONN_F_SEQ_MASK) { | |
976 | opt = (struct ip_vs_sync_conn_options *)&s[1]; | |
977 | p += FULL_CONN_SIZE; | |
978 | if (p > buffer+buflen) { | |
fe5e7a1e | 979 | IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n"); |
2ad17def JA |
980 | return; |
981 | } | |
982 | } else { | |
983 | opt = NULL; | |
984 | p += SIMPLE_CONN_SIZE; | |
985 | } | |
986 | ||
b209639e | 987 | state = ntohs(s->state); |
2ad17def JA |
988 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) { |
989 | pp = ip_vs_proto_get(s->protocol); | |
990 | if (!pp) { | |
fe5e7a1e | 991 | IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n", |
2ad17def JA |
992 | s->protocol); |
993 | continue; | |
994 | } | |
995 | if (state >= pp->num_states) { | |
fe5e7a1e | 996 | IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n", |
2ad17def JA |
997 | pp->name, state); |
998 | continue; | |
999 | } | |
1000 | } else { | |
1001 | /* protocol in templates is not used for state/timeout */ | |
2ad17def | 1002 | if (state > 0) { |
fe5e7a1e | 1003 | IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n", |
2ad17def JA |
1004 | state); |
1005 | state = 0; | |
1006 | } | |
1007 | } | |
1008 | ||
6e67e586 | 1009 | ip_vs_conn_fill_param(net, AF_INET, s->protocol, |
fe5e7a1e HS |
1010 | (const union nf_inet_addr *)&s->caddr, |
1011 | s->cport, | |
1012 | (const union nf_inet_addr *)&s->vaddr, | |
1013 | s->vport, ¶m); | |
1014 | ||
1015 | /* Send timeout as Zero */ | |
9bbac6a9 | 1016 | ip_vs_proc_conn(net, ¶m, flags, state, s->protocol, AF_INET, |
fe5e7a1e | 1017 | (union nf_inet_addr *)&s->daddr, s->dport, |
9bbac6a9 | 1018 | 0, 0, opt); |
fe5e7a1e HS |
1019 | } |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Handle options | |
1024 | */ | |
1025 | static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen, | |
1026 | __u32 *opt_flags, | |
1027 | struct ip_vs_sync_conn_options *opt) | |
1028 | { | |
1029 | struct ip_vs_sync_conn_options *topt; | |
1030 | ||
1031 | topt = (struct ip_vs_sync_conn_options *)p; | |
1032 | ||
1033 | if (plen != sizeof(struct ip_vs_sync_conn_options)) { | |
1034 | IP_VS_DBG(2, "BACKUP, bogus conn options length\n"); | |
1035 | return -EINVAL; | |
1036 | } | |
1037 | if (*opt_flags & IPVS_OPT_F_SEQ_DATA) { | |
1038 | IP_VS_DBG(2, "BACKUP, conn options found twice\n"); | |
1039 | return -EINVAL; | |
1040 | } | |
1041 | ntoh_seq(&topt->in_seq, &opt->in_seq); | |
1042 | ntoh_seq(&topt->out_seq, &opt->out_seq); | |
1043 | *opt_flags |= IPVS_OPT_F_SEQ_DATA; | |
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len, | |
1048 | __u8 **data, unsigned int maxlen, | |
1049 | __u32 *opt_flags, __u32 flag) | |
1050 | { | |
1051 | if (plen > maxlen) { | |
1052 | IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen); | |
1053 | return -EINVAL; | |
1054 | } | |
1055 | if (*opt_flags & flag) { | |
1056 | IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag); | |
1057 | return -EINVAL; | |
1058 | } | |
1059 | *data_len = plen; | |
1060 | *data = p; | |
1061 | *opt_flags |= flag; | |
1062 | return 0; | |
1063 | } | |
1064 | /* | |
1065 | * Process a Version 1 sync. connection | |
1066 | */ | |
9bbac6a9 | 1067 | static inline int ip_vs_proc_sync_conn(struct net *net, __u8 *p, __u8 *msg_end) |
fe5e7a1e HS |
1068 | { |
1069 | struct ip_vs_sync_conn_options opt; | |
1070 | union ip_vs_sync_conn *s; | |
1071 | struct ip_vs_protocol *pp; | |
1072 | struct ip_vs_conn_param param; | |
1073 | __u32 flags; | |
1074 | unsigned int af, state, pe_data_len=0, pe_name_len=0; | |
1075 | __u8 *pe_data=NULL, *pe_name=NULL; | |
1076 | __u32 opt_flags=0; | |
1077 | int retc=0; | |
1078 | ||
1079 | s = (union ip_vs_sync_conn *) p; | |
1080 | ||
1081 | if (s->v6.type & STYPE_F_INET6) { | |
1082 | #ifdef CONFIG_IP_VS_IPV6 | |
1083 | af = AF_INET6; | |
1084 | p += sizeof(struct ip_vs_sync_v6); | |
1085 | #else | |
1086 | IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n"); | |
1087 | retc = 10; | |
1088 | goto out; | |
1089 | #endif | |
1090 | } else if (!s->v4.type) { | |
1091 | af = AF_INET; | |
1092 | p += sizeof(struct ip_vs_sync_v4); | |
1093 | } else { | |
1094 | return -10; | |
1095 | } | |
1096 | if (p > msg_end) | |
1097 | return -20; | |
1098 | ||
1099 | /* Process optional params check Type & Len. */ | |
1100 | while (p < msg_end) { | |
1101 | int ptype; | |
1102 | int plen; | |
1103 | ||
1104 | if (p+2 > msg_end) | |
1105 | return -30; | |
1106 | ptype = *(p++); | |
1107 | plen = *(p++); | |
1108 | ||
1109 | if (!plen || ((p + plen) > msg_end)) | |
1110 | return -40; | |
1111 | /* Handle seq option p = param data */ | |
1112 | switch (ptype & ~IPVS_OPT_F_PARAM) { | |
1113 | case IPVS_OPT_SEQ_DATA: | |
1114 | if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt)) | |
1115 | return -50; | |
1116 | break; | |
1117 | ||
1118 | case IPVS_OPT_PE_DATA: | |
1119 | if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data, | |
1120 | IP_VS_PEDATA_MAXLEN, &opt_flags, | |
1121 | IPVS_OPT_F_PE_DATA)) | |
1122 | return -60; | |
1123 | break; | |
1124 | ||
1125 | case IPVS_OPT_PE_NAME: | |
1126 | if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name, | |
1127 | IP_VS_PENAME_MAXLEN, &opt_flags, | |
1128 | IPVS_OPT_F_PE_NAME)) | |
1129 | return -70; | |
1130 | break; | |
1131 | ||
1132 | default: | |
1133 | /* Param data mandatory ? */ | |
1134 | if (!(ptype & IPVS_OPT_F_PARAM)) { | |
1135 | IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n", | |
1136 | ptype & ~IPVS_OPT_F_PARAM); | |
1137 | retc = 20; | |
1138 | goto out; | |
1139 | } | |
f11017ec | 1140 | } |
fe5e7a1e HS |
1141 | p += plen; /* Next option */ |
1142 | } | |
1143 | ||
1144 | /* Get flags and Mask off unsupported */ | |
1145 | flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK; | |
1146 | flags |= IP_VS_CONN_F_SYNC; | |
1147 | state = ntohs(s->v4.state); | |
1148 | ||
1149 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) { | |
1150 | pp = ip_vs_proto_get(s->v4.protocol); | |
1151 | if (!pp) { | |
1152 | IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n", | |
1153 | s->v4.protocol); | |
1154 | retc = 30; | |
1155 | goto out; | |
1156 | } | |
1157 | if (state >= pp->num_states) { | |
1158 | IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n", | |
1159 | pp->name, state); | |
1160 | retc = 40; | |
1161 | goto out; | |
1162 | } | |
1163 | } else { | |
1164 | /* protocol in templates is not used for state/timeout */ | |
fe5e7a1e HS |
1165 | if (state > 0) { |
1166 | IP_VS_DBG(3, "BACKUP, Invalid template state %u\n", | |
1167 | state); | |
1168 | state = 0; | |
1169 | } | |
1170 | } | |
6e67e586 HS |
1171 | if (ip_vs_conn_fill_param_sync(net, af, s, ¶m, pe_data, |
1172 | pe_data_len, pe_name, pe_name_len)) { | |
fe5e7a1e HS |
1173 | retc = 50; |
1174 | goto out; | |
1175 | } | |
1176 | /* If only IPv4, just silent skip IPv6 */ | |
1177 | if (af == AF_INET) | |
9bbac6a9 | 1178 | ip_vs_proc_conn(net, ¶m, flags, state, s->v4.protocol, af, |
fe5e7a1e HS |
1179 | (union nf_inet_addr *)&s->v4.daddr, s->v4.dport, |
1180 | ntohl(s->v4.timeout), ntohl(s->v4.fwmark), | |
9bbac6a9 HS |
1181 | (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL) |
1182 | ); | |
fe5e7a1e HS |
1183 | #ifdef CONFIG_IP_VS_IPV6 |
1184 | else | |
9bbac6a9 | 1185 | ip_vs_proc_conn(net, ¶m, flags, state, s->v6.protocol, af, |
fe5e7a1e HS |
1186 | (union nf_inet_addr *)&s->v6.daddr, s->v6.dport, |
1187 | ntohl(s->v6.timeout), ntohl(s->v6.fwmark), | |
9bbac6a9 HS |
1188 | (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL) |
1189 | ); | |
fe5e7a1e | 1190 | #endif |
528c943f | 1191 | ip_vs_pe_put(param.pe); |
fe5e7a1e HS |
1192 | return 0; |
1193 | /* Error exit */ | |
1194 | out: | |
1195 | IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc); | |
1196 | return retc; | |
1197 | ||
1198 | } | |
1199 | /* | |
1200 | * Process received multicast message and create the corresponding | |
1201 | * ip_vs_conn entries. | |
1202 | * Handles Version 0 & 1 | |
1203 | */ | |
9bbac6a9 HS |
1204 | static void ip_vs_process_message(struct net *net, __u8 *buffer, |
1205 | const size_t buflen) | |
fe5e7a1e | 1206 | { |
f131315f | 1207 | struct netns_ipvs *ipvs = net_ipvs(net); |
986a0757 | 1208 | struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer; |
fe5e7a1e | 1209 | __u8 *p, *msg_end; |
986a0757 | 1210 | int i, nr_conns; |
fe5e7a1e | 1211 | |
986a0757 | 1212 | if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) { |
fe5e7a1e HS |
1213 | IP_VS_DBG(2, "BACKUP, message header too short\n"); |
1214 | return; | |
1215 | } | |
fe5e7a1e | 1216 | |
38561437 | 1217 | if (buflen != ntohs(m2->size)) { |
fe5e7a1e HS |
1218 | IP_VS_DBG(2, "BACKUP, bogus message size\n"); |
1219 | return; | |
1220 | } | |
1221 | /* SyncID sanity check */ | |
f131315f | 1222 | if (ipvs->backup_syncid != 0 && m2->syncid != ipvs->backup_syncid) { |
fe5e7a1e HS |
1223 | IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid); |
1224 | return; | |
1225 | } | |
1226 | /* Handle version 1 message */ | |
1227 | if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0) | |
1228 | && (m2->spare == 0)) { | |
1229 | ||
986a0757 | 1230 | msg_end = buffer + sizeof(struct ip_vs_sync_mesg); |
fe5e7a1e HS |
1231 | nr_conns = m2->nr_conns; |
1232 | ||
1233 | for (i=0; i<nr_conns; i++) { | |
1234 | union ip_vs_sync_conn *s; | |
95c96174 | 1235 | unsigned int size; |
fe5e7a1e HS |
1236 | int retc; |
1237 | ||
1238 | p = msg_end; | |
1239 | if (p + sizeof(s->v4) > buffer+buflen) { | |
1240 | IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n"); | |
1241 | return; | |
b209639e | 1242 | } |
fe5e7a1e HS |
1243 | s = (union ip_vs_sync_conn *)p; |
1244 | size = ntohs(s->v4.ver_size) & SVER_MASK; | |
1245 | msg_end = p + size; | |
1246 | /* Basic sanity checks */ | |
1247 | if (msg_end > buffer+buflen) { | |
1248 | IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n"); | |
1da177e4 LT |
1249 | return; |
1250 | } | |
fe5e7a1e HS |
1251 | if (ntohs(s->v4.ver_size) >> SVER_SHIFT) { |
1252 | IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n", | |
1253 | ntohs(s->v4.ver_size) >> SVER_SHIFT); | |
1254 | return; | |
b209639e | 1255 | } |
fe5e7a1e | 1256 | /* Process a single sync_conn */ |
9bbac6a9 HS |
1257 | retc = ip_vs_proc_sync_conn(net, p, msg_end); |
1258 | if (retc < 0) { | |
fe5e7a1e HS |
1259 | IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n", |
1260 | retc); | |
1261 | return; | |
2906f66a | 1262 | } |
fe5e7a1e HS |
1263 | /* Make sure we have 32 bit alignment */ |
1264 | msg_end = p + ((size + 3) & ~3); | |
b209639e | 1265 | } |
fe5e7a1e HS |
1266 | } else { |
1267 | /* Old type of message */ | |
9bbac6a9 | 1268 | ip_vs_process_message_v0(net, buffer, buflen); |
fe5e7a1e | 1269 | return; |
1da177e4 LT |
1270 | } |
1271 | } | |
1272 | ||
1273 | ||
1c003b15 PNA |
1274 | /* |
1275 | * Setup sndbuf (mode=1) or rcvbuf (mode=0) | |
1276 | */ | |
1277 | static void set_sock_size(struct sock *sk, int mode, int val) | |
1278 | { | |
1279 | /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */ | |
1280 | /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */ | |
1281 | lock_sock(sk); | |
1282 | if (mode) { | |
1283 | val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2, | |
1284 | sysctl_wmem_max); | |
1285 | sk->sk_sndbuf = val * 2; | |
1286 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
1287 | } else { | |
1288 | val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2, | |
1289 | sysctl_rmem_max); | |
1290 | sk->sk_rcvbuf = val * 2; | |
1291 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
1292 | } | |
1293 | release_sock(sk); | |
1294 | } | |
1295 | ||
1da177e4 LT |
1296 | /* |
1297 | * Setup loopback of outgoing multicasts on a sending socket | |
1298 | */ | |
1299 | static void set_mcast_loop(struct sock *sk, u_char loop) | |
1300 | { | |
1301 | struct inet_sock *inet = inet_sk(sk); | |
1302 | ||
1303 | /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */ | |
1304 | lock_sock(sk); | |
1305 | inet->mc_loop = loop ? 1 : 0; | |
1306 | release_sock(sk); | |
1307 | } | |
1308 | ||
1309 | /* | |
1310 | * Specify TTL for outgoing multicasts on a sending socket | |
1311 | */ | |
1312 | static void set_mcast_ttl(struct sock *sk, u_char ttl) | |
1313 | { | |
1314 | struct inet_sock *inet = inet_sk(sk); | |
1315 | ||
1316 | /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */ | |
1317 | lock_sock(sk); | |
1318 | inet->mc_ttl = ttl; | |
1319 | release_sock(sk); | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Specifiy default interface for outgoing multicasts | |
1324 | */ | |
1325 | static int set_mcast_if(struct sock *sk, char *ifname) | |
1326 | { | |
1327 | struct net_device *dev; | |
1328 | struct inet_sock *inet = inet_sk(sk); | |
f131315f | 1329 | struct net *net = sock_net(sk); |
1da177e4 | 1330 | |
f131315f HS |
1331 | dev = __dev_get_by_name(net, ifname); |
1332 | if (!dev) | |
1da177e4 LT |
1333 | return -ENODEV; |
1334 | ||
1335 | if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) | |
1336 | return -EINVAL; | |
1337 | ||
1338 | lock_sock(sk); | |
1339 | inet->mc_index = dev->ifindex; | |
1340 | /* inet->mc_addr = 0; */ | |
1341 | release_sock(sk); | |
1342 | ||
1343 | return 0; | |
1344 | } | |
1345 | ||
1346 | ||
1347 | /* | |
1348 | * Set the maximum length of sync message according to the | |
1349 | * specified interface's MTU. | |
1350 | */ | |
f131315f | 1351 | static int set_sync_mesg_maxlen(struct net *net, int sync_state) |
1da177e4 | 1352 | { |
f131315f | 1353 | struct netns_ipvs *ipvs = net_ipvs(net); |
1da177e4 LT |
1354 | struct net_device *dev; |
1355 | int num; | |
1356 | ||
1357 | if (sync_state == IP_VS_STATE_MASTER) { | |
f131315f HS |
1358 | dev = __dev_get_by_name(net, ipvs->master_mcast_ifn); |
1359 | if (!dev) | |
1da177e4 LT |
1360 | return -ENODEV; |
1361 | ||
1362 | num = (dev->mtu - sizeof(struct iphdr) - | |
1363 | sizeof(struct udphdr) - | |
1364 | SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE; | |
f131315f | 1365 | ipvs->send_mesg_maxlen = SYNC_MESG_HEADER_LEN + |
e6f225eb | 1366 | SIMPLE_CONN_SIZE * min(num, MAX_CONNS_PER_SYNCBUFF); |
1da177e4 | 1367 | IP_VS_DBG(7, "setting the maximum length of sync sending " |
f131315f | 1368 | "message %d.\n", ipvs->send_mesg_maxlen); |
1da177e4 | 1369 | } else if (sync_state == IP_VS_STATE_BACKUP) { |
f131315f HS |
1370 | dev = __dev_get_by_name(net, ipvs->backup_mcast_ifn); |
1371 | if (!dev) | |
1da177e4 LT |
1372 | return -ENODEV; |
1373 | ||
f131315f | 1374 | ipvs->recv_mesg_maxlen = dev->mtu - |
1da177e4 LT |
1375 | sizeof(struct iphdr) - sizeof(struct udphdr); |
1376 | IP_VS_DBG(7, "setting the maximum length of sync receiving " | |
f131315f | 1377 | "message %d.\n", ipvs->recv_mesg_maxlen); |
1da177e4 LT |
1378 | } |
1379 | ||
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | ||
1384 | /* | |
1385 | * Join a multicast group. | |
1386 | * the group is specified by a class D multicast address 224.0.0.0/8 | |
1387 | * in the in_addr structure passed in as a parameter. | |
1388 | */ | |
1389 | static int | |
1390 | join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname) | |
1391 | { | |
f131315f | 1392 | struct net *net = sock_net(sk); |
1da177e4 LT |
1393 | struct ip_mreqn mreq; |
1394 | struct net_device *dev; | |
1395 | int ret; | |
1396 | ||
1397 | memset(&mreq, 0, sizeof(mreq)); | |
1398 | memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr)); | |
1399 | ||
f131315f HS |
1400 | dev = __dev_get_by_name(net, ifname); |
1401 | if (!dev) | |
1da177e4 LT |
1402 | return -ENODEV; |
1403 | if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) | |
1404 | return -EINVAL; | |
1405 | ||
1406 | mreq.imr_ifindex = dev->ifindex; | |
1407 | ||
1408 | lock_sock(sk); | |
1409 | ret = ip_mc_join_group(sk, &mreq); | |
1410 | release_sock(sk); | |
1411 | ||
1412 | return ret; | |
1413 | } | |
1414 | ||
1415 | ||
1416 | static int bind_mcastif_addr(struct socket *sock, char *ifname) | |
1417 | { | |
f131315f | 1418 | struct net *net = sock_net(sock->sk); |
1da177e4 | 1419 | struct net_device *dev; |
a61ced5d | 1420 | __be32 addr; |
1da177e4 LT |
1421 | struct sockaddr_in sin; |
1422 | ||
f131315f HS |
1423 | dev = __dev_get_by_name(net, ifname); |
1424 | if (!dev) | |
1da177e4 LT |
1425 | return -ENODEV; |
1426 | ||
1427 | addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
1428 | if (!addr) | |
1e3e238e HE |
1429 | pr_err("You probably need to specify IP address on " |
1430 | "multicast interface.\n"); | |
1da177e4 | 1431 | |
14d5e834 HH |
1432 | IP_VS_DBG(7, "binding socket with (%s) %pI4\n", |
1433 | ifname, &addr); | |
1da177e4 LT |
1434 | |
1435 | /* Now bind the socket with the address of multicast interface */ | |
1436 | sin.sin_family = AF_INET; | |
1437 | sin.sin_addr.s_addr = addr; | |
1438 | sin.sin_port = 0; | |
1439 | ||
1440 | return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin)); | |
1441 | } | |
1442 | ||
1443 | /* | |
1444 | * Set up sending multicast socket over UDP | |
1445 | */ | |
f73181c8 | 1446 | static struct socket *make_send_sock(struct net *net, int id) |
1da177e4 | 1447 | { |
f131315f | 1448 | struct netns_ipvs *ipvs = net_ipvs(net); |
f73181c8 PNA |
1449 | /* multicast addr */ |
1450 | struct sockaddr_in mcast_addr = { | |
1451 | .sin_family = AF_INET, | |
1452 | .sin_port = cpu_to_be16(IP_VS_SYNC_PORT + id), | |
1453 | .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP), | |
1454 | }; | |
1da177e4 | 1455 | struct socket *sock; |
e6dd731c | 1456 | int result; |
1da177e4 | 1457 | |
26abe143 EB |
1458 | /* First create a socket */ |
1459 | result = sock_create_kern(net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); | |
e6dd731c | 1460 | if (result < 0) { |
1e3e238e | 1461 | pr_err("Error during creation of socket; terminating\n"); |
e6dd731c | 1462 | return ERR_PTR(result); |
1da177e4 | 1463 | } |
f131315f | 1464 | result = set_mcast_if(sock->sk, ipvs->master_mcast_ifn); |
e6dd731c | 1465 | if (result < 0) { |
1e3e238e | 1466 | pr_err("Error setting outbound mcast interface\n"); |
1da177e4 LT |
1467 | goto error; |
1468 | } | |
1469 | ||
1470 | set_mcast_loop(sock->sk, 0); | |
1471 | set_mcast_ttl(sock->sk, 1); | |
1c003b15 PNA |
1472 | result = sysctl_sync_sock_size(ipvs); |
1473 | if (result > 0) | |
1474 | set_sock_size(sock->sk, 1, result); | |
1da177e4 | 1475 | |
f131315f | 1476 | result = bind_mcastif_addr(sock, ipvs->master_mcast_ifn); |
e6dd731c | 1477 | if (result < 0) { |
1e3e238e | 1478 | pr_err("Error binding address of the mcast interface\n"); |
1da177e4 LT |
1479 | goto error; |
1480 | } | |
1481 | ||
e6dd731c SW |
1482 | result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr, |
1483 | sizeof(struct sockaddr), 0); | |
1484 | if (result < 0) { | |
1e3e238e | 1485 | pr_err("Error connecting to the multicast addr\n"); |
1da177e4 LT |
1486 | goto error; |
1487 | } | |
1488 | ||
1489 | return sock; | |
1490 | ||
1ae132b0 | 1491 | error: |
26abe143 | 1492 | sock_release(sock); |
e6dd731c | 1493 | return ERR_PTR(result); |
1da177e4 LT |
1494 | } |
1495 | ||
1496 | ||
1497 | /* | |
1498 | * Set up receiving multicast socket over UDP | |
1499 | */ | |
f73181c8 | 1500 | static struct socket *make_receive_sock(struct net *net, int id) |
1da177e4 | 1501 | { |
f131315f | 1502 | struct netns_ipvs *ipvs = net_ipvs(net); |
f73181c8 PNA |
1503 | /* multicast addr */ |
1504 | struct sockaddr_in mcast_addr = { | |
1505 | .sin_family = AF_INET, | |
1506 | .sin_port = cpu_to_be16(IP_VS_SYNC_PORT + id), | |
1507 | .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP), | |
1508 | }; | |
1da177e4 | 1509 | struct socket *sock; |
e6dd731c | 1510 | int result; |
1da177e4 LT |
1511 | |
1512 | /* First create a socket */ | |
26abe143 | 1513 | result = sock_create_kern(net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
e6dd731c | 1514 | if (result < 0) { |
1e3e238e | 1515 | pr_err("Error during creation of socket; terminating\n"); |
e6dd731c | 1516 | return ERR_PTR(result); |
1da177e4 | 1517 | } |
1da177e4 | 1518 | /* it is equivalent to the REUSEADDR option in user-space */ |
4a17fd52 | 1519 | sock->sk->sk_reuse = SK_CAN_REUSE; |
1c003b15 PNA |
1520 | result = sysctl_sync_sock_size(ipvs); |
1521 | if (result > 0) | |
1522 | set_sock_size(sock->sk, 0, result); | |
1da177e4 | 1523 | |
e6dd731c SW |
1524 | result = sock->ops->bind(sock, (struct sockaddr *) &mcast_addr, |
1525 | sizeof(struct sockaddr)); | |
1526 | if (result < 0) { | |
1e3e238e | 1527 | pr_err("Error binding to the multicast addr\n"); |
1da177e4 LT |
1528 | goto error; |
1529 | } | |
1530 | ||
1531 | /* join the multicast group */ | |
e6dd731c SW |
1532 | result = join_mcast_group(sock->sk, |
1533 | (struct in_addr *) &mcast_addr.sin_addr, | |
f131315f | 1534 | ipvs->backup_mcast_ifn); |
e6dd731c | 1535 | if (result < 0) { |
1e3e238e | 1536 | pr_err("Error joining to the multicast group\n"); |
1da177e4 LT |
1537 | goto error; |
1538 | } | |
1539 | ||
1540 | return sock; | |
1541 | ||
1ae132b0 | 1542 | error: |
26abe143 | 1543 | sock_release(sock); |
e6dd731c | 1544 | return ERR_PTR(result); |
1da177e4 LT |
1545 | } |
1546 | ||
1547 | ||
1548 | static int | |
1549 | ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length) | |
1550 | { | |
1551 | struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL}; | |
1552 | struct kvec iov; | |
1553 | int len; | |
1554 | ||
1555 | EnterFunction(7); | |
1556 | iov.iov_base = (void *)buffer; | |
1557 | iov.iov_len = length; | |
1558 | ||
1559 | len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length)); | |
1560 | ||
1561 | LeaveFunction(7); | |
1562 | return len; | |
1563 | } | |
1564 | ||
1c003b15 | 1565 | static int |
1da177e4 LT |
1566 | ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg) |
1567 | { | |
1568 | int msize; | |
1c003b15 | 1569 | int ret; |
1da177e4 | 1570 | |
38561437 | 1571 | msize = ntohs(msg->size); |
1da177e4 | 1572 | |
1c003b15 PNA |
1573 | ret = ip_vs_send_async(sock, (char *)msg, msize); |
1574 | if (ret >= 0 || ret == -EAGAIN) | |
1575 | return ret; | |
1576 | pr_err("ip_vs_send_async error %d\n", ret); | |
1577 | return 0; | |
1da177e4 LT |
1578 | } |
1579 | ||
1580 | static int | |
1581 | ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen) | |
1582 | { | |
1583 | struct msghdr msg = {NULL,}; | |
1584 | struct kvec iov; | |
1585 | int len; | |
1586 | ||
1587 | EnterFunction(7); | |
1588 | ||
1589 | /* Receive a packet */ | |
1590 | iov.iov_base = buffer; | |
1591 | iov.iov_len = (size_t)buflen; | |
1592 | ||
f73181c8 | 1593 | len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, MSG_DONTWAIT); |
1da177e4 LT |
1594 | |
1595 | if (len < 0) | |
f73181c8 | 1596 | return len; |
1da177e4 LT |
1597 | |
1598 | LeaveFunction(7); | |
1599 | return len; | |
1600 | } | |
1601 | ||
1c003b15 PNA |
1602 | /* Wakeup the master thread for sending */ |
1603 | static void master_wakeup_work_handler(struct work_struct *work) | |
1604 | { | |
f73181c8 PNA |
1605 | struct ipvs_master_sync_state *ms = |
1606 | container_of(work, struct ipvs_master_sync_state, | |
1607 | master_wakeup_work.work); | |
1608 | struct netns_ipvs *ipvs = ms->ipvs; | |
1c003b15 PNA |
1609 | |
1610 | spin_lock_bh(&ipvs->sync_lock); | |
f73181c8 PNA |
1611 | if (ms->sync_queue_len && |
1612 | ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) { | |
1613 | ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE; | |
1614 | wake_up_process(ms->master_thread); | |
1c003b15 PNA |
1615 | } |
1616 | spin_unlock_bh(&ipvs->sync_lock); | |
1617 | } | |
1618 | ||
1619 | /* Get next buffer to send */ | |
1620 | static inline struct ip_vs_sync_buff * | |
f73181c8 | 1621 | next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms) |
1c003b15 PNA |
1622 | { |
1623 | struct ip_vs_sync_buff *sb; | |
1624 | ||
f73181c8 | 1625 | sb = sb_dequeue(ipvs, ms); |
1c003b15 PNA |
1626 | if (sb) |
1627 | return sb; | |
1628 | /* Do not delay entries in buffer for more than 2 seconds */ | |
f73181c8 | 1629 | return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME); |
1c003b15 | 1630 | } |
1da177e4 | 1631 | |
998e7a76 | 1632 | static int sync_thread_master(void *data) |
1da177e4 | 1633 | { |
998e7a76 | 1634 | struct ip_vs_sync_thread_data *tinfo = data; |
f131315f | 1635 | struct netns_ipvs *ipvs = net_ipvs(tinfo->net); |
f73181c8 | 1636 | struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id]; |
1c003b15 | 1637 | struct sock *sk = tinfo->sock->sk; |
1da177e4 LT |
1638 | struct ip_vs_sync_buff *sb; |
1639 | ||
1e3e238e | 1640 | pr_info("sync thread started: state = MASTER, mcast_ifn = %s, " |
f73181c8 PNA |
1641 | "syncid = %d, id = %d\n", |
1642 | ipvs->master_mcast_ifn, ipvs->master_syncid, tinfo->id); | |
1da177e4 | 1643 | |
1c003b15 | 1644 | for (;;) { |
f73181c8 | 1645 | sb = next_sync_buff(ipvs, ms); |
1c003b15 PNA |
1646 | if (unlikely(kthread_should_stop())) |
1647 | break; | |
1648 | if (!sb) { | |
1649 | schedule_timeout(IPVS_SYNC_CHECK_PERIOD); | |
1650 | continue; | |
1da177e4 | 1651 | } |
1c003b15 | 1652 | while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) { |
9dcbe1b8 GU |
1653 | /* (Ab)use interruptible sleep to avoid increasing |
1654 | * the load avg. | |
1655 | */ | |
1656 | __wait_event_interruptible(*sk_sleep(sk), | |
1c003b15 | 1657 | sock_writeable(sk) || |
35a2af94 | 1658 | kthread_should_stop()); |
1c003b15 PNA |
1659 | if (unlikely(kthread_should_stop())) |
1660 | goto done; | |
1da177e4 | 1661 | } |
1c003b15 | 1662 | ip_vs_sync_buff_release(sb); |
1da177e4 LT |
1663 | } |
1664 | ||
1c003b15 PNA |
1665 | done: |
1666 | __set_current_state(TASK_RUNNING); | |
1667 | if (sb) | |
1668 | ip_vs_sync_buff_release(sb); | |
1669 | ||
1da177e4 | 1670 | /* clean up the sync_buff queue */ |
f73181c8 | 1671 | while ((sb = sb_dequeue(ipvs, ms))) |
1da177e4 | 1672 | ip_vs_sync_buff_release(sb); |
1c003b15 | 1673 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
1674 | |
1675 | /* clean up the current sync_buff */ | |
f73181c8 | 1676 | sb = get_curr_sync_buff(ipvs, ms, 0); |
f131315f | 1677 | if (sb) |
1da177e4 | 1678 | ip_vs_sync_buff_release(sb); |
1da177e4 LT |
1679 | |
1680 | /* release the sending multicast socket */ | |
26abe143 | 1681 | sock_release(tinfo->sock); |
998e7a76 SW |
1682 | kfree(tinfo); |
1683 | ||
1684 | return 0; | |
1da177e4 LT |
1685 | } |
1686 | ||
1687 | ||
998e7a76 | 1688 | static int sync_thread_backup(void *data) |
1da177e4 | 1689 | { |
998e7a76 | 1690 | struct ip_vs_sync_thread_data *tinfo = data; |
f131315f | 1691 | struct netns_ipvs *ipvs = net_ipvs(tinfo->net); |
1da177e4 LT |
1692 | int len; |
1693 | ||
1e3e238e | 1694 | pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, " |
f73181c8 PNA |
1695 | "syncid = %d, id = %d\n", |
1696 | ipvs->backup_mcast_ifn, ipvs->backup_syncid, tinfo->id); | |
1da177e4 | 1697 | |
998e7a76 | 1698 | while (!kthread_should_stop()) { |
aa395145 | 1699 | wait_event_interruptible(*sk_sleep(tinfo->sock->sk), |
ba6fd850 SW |
1700 | !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue) |
1701 | || kthread_should_stop()); | |
1702 | ||
998e7a76 SW |
1703 | /* do we have data now? */ |
1704 | while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) { | |
1705 | len = ip_vs_receive(tinfo->sock, tinfo->buf, | |
f131315f | 1706 | ipvs->recv_mesg_maxlen); |
998e7a76 | 1707 | if (len <= 0) { |
f73181c8 PNA |
1708 | if (len != -EAGAIN) |
1709 | pr_err("receiving message error\n"); | |
1da177e4 LT |
1710 | break; |
1711 | } | |
998e7a76 | 1712 | |
f131315f | 1713 | ip_vs_process_message(tinfo->net, tinfo->buf, len); |
1da177e4 | 1714 | } |
1da177e4 LT |
1715 | } |
1716 | ||
1717 | /* release the sending multicast socket */ | |
26abe143 | 1718 | sock_release(tinfo->sock); |
998e7a76 SW |
1719 | kfree(tinfo->buf); |
1720 | kfree(tinfo); | |
1da177e4 | 1721 | |
998e7a76 | 1722 | return 0; |
1da177e4 LT |
1723 | } |
1724 | ||
1725 | ||
f131315f | 1726 | int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid) |
1da177e4 | 1727 | { |
998e7a76 | 1728 | struct ip_vs_sync_thread_data *tinfo; |
f73181c8 | 1729 | struct task_struct **array = NULL, *task; |
998e7a76 | 1730 | struct socket *sock; |
f131315f | 1731 | struct netns_ipvs *ipvs = net_ipvs(net); |
f73181c8 | 1732 | char *name; |
998e7a76 | 1733 | int (*threadfn)(void *data); |
f73181c8 | 1734 | int id, count; |
998e7a76 | 1735 | int result = -ENOMEM; |
1da177e4 | 1736 | |
1e3e238e | 1737 | IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current)); |
998e7a76 | 1738 | IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n", |
2981bc9a | 1739 | sizeof(struct ip_vs_sync_conn_v0)); |
1da177e4 | 1740 | |
f73181c8 PNA |
1741 | if (!ipvs->sync_state) { |
1742 | count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX); | |
1743 | ipvs->threads_mask = count - 1; | |
1744 | } else | |
1745 | count = ipvs->threads_mask + 1; | |
ae1d48b2 | 1746 | |
998e7a76 | 1747 | if (state == IP_VS_STATE_MASTER) { |
f73181c8 | 1748 | if (ipvs->ms) |
998e7a76 | 1749 | return -EEXIST; |
1da177e4 | 1750 | |
f131315f HS |
1751 | strlcpy(ipvs->master_mcast_ifn, mcast_ifn, |
1752 | sizeof(ipvs->master_mcast_ifn)); | |
1753 | ipvs->master_syncid = syncid; | |
f73181c8 | 1754 | name = "ipvs-m:%d:%d"; |
998e7a76 | 1755 | threadfn = sync_thread_master; |
998e7a76 | 1756 | } else if (state == IP_VS_STATE_BACKUP) { |
f73181c8 | 1757 | if (ipvs->backup_threads) |
998e7a76 SW |
1758 | return -EEXIST; |
1759 | ||
f131315f HS |
1760 | strlcpy(ipvs->backup_mcast_ifn, mcast_ifn, |
1761 | sizeof(ipvs->backup_mcast_ifn)); | |
1762 | ipvs->backup_syncid = syncid; | |
f73181c8 | 1763 | name = "ipvs-b:%d:%d"; |
998e7a76 | 1764 | threadfn = sync_thread_backup; |
1da177e4 | 1765 | } else { |
1da177e4 LT |
1766 | return -EINVAL; |
1767 | } | |
1768 | ||
f73181c8 PNA |
1769 | if (state == IP_VS_STATE_MASTER) { |
1770 | struct ipvs_master_sync_state *ms; | |
1da177e4 | 1771 | |
f73181c8 PNA |
1772 | ipvs->ms = kzalloc(count * sizeof(ipvs->ms[0]), GFP_KERNEL); |
1773 | if (!ipvs->ms) | |
1774 | goto out; | |
1775 | ms = ipvs->ms; | |
1776 | for (id = 0; id < count; id++, ms++) { | |
1777 | INIT_LIST_HEAD(&ms->sync_queue); | |
1778 | ms->sync_queue_len = 0; | |
1779 | ms->sync_queue_delay = 0; | |
1780 | INIT_DELAYED_WORK(&ms->master_wakeup_work, | |
1781 | master_wakeup_work_handler); | |
1782 | ms->ipvs = ipvs; | |
1783 | } | |
1784 | } else { | |
1785 | array = kzalloc(count * sizeof(struct task_struct *), | |
1786 | GFP_KERNEL); | |
1787 | if (!array) | |
1788 | goto out; | |
998e7a76 | 1789 | } |
f73181c8 | 1790 | set_sync_mesg_maxlen(net, state); |
1da177e4 | 1791 | |
f73181c8 PNA |
1792 | tinfo = NULL; |
1793 | for (id = 0; id < count; id++) { | |
1794 | if (state == IP_VS_STATE_MASTER) | |
1795 | sock = make_send_sock(net, id); | |
1796 | else | |
1797 | sock = make_receive_sock(net, id); | |
1798 | if (IS_ERR(sock)) { | |
1799 | result = PTR_ERR(sock); | |
1800 | goto outtinfo; | |
1801 | } | |
1802 | tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL); | |
1803 | if (!tinfo) | |
1804 | goto outsocket; | |
1805 | tinfo->net = net; | |
1806 | tinfo->sock = sock; | |
1807 | if (state == IP_VS_STATE_BACKUP) { | |
1808 | tinfo->buf = kmalloc(ipvs->recv_mesg_maxlen, | |
1809 | GFP_KERNEL); | |
1810 | if (!tinfo->buf) | |
1811 | goto outtinfo; | |
b425df4c DC |
1812 | } else { |
1813 | tinfo->buf = NULL; | |
f73181c8 PNA |
1814 | } |
1815 | tinfo->id = id; | |
1da177e4 | 1816 | |
f73181c8 PNA |
1817 | task = kthread_run(threadfn, tinfo, name, ipvs->gen, id); |
1818 | if (IS_ERR(task)) { | |
1819 | result = PTR_ERR(task); | |
1820 | goto outtinfo; | |
1821 | } | |
1822 | tinfo = NULL; | |
1823 | if (state == IP_VS_STATE_MASTER) | |
1824 | ipvs->ms[id].master_thread = task; | |
1825 | else | |
1826 | array[id] = task; | |
998e7a76 | 1827 | } |
1da177e4 | 1828 | |
998e7a76 | 1829 | /* mark as active */ |
f73181c8 PNA |
1830 | |
1831 | if (state == IP_VS_STATE_BACKUP) | |
1832 | ipvs->backup_threads = array; | |
1833 | spin_lock_bh(&ipvs->sync_buff_lock); | |
f131315f | 1834 | ipvs->sync_state |= state; |
f73181c8 | 1835 | spin_unlock_bh(&ipvs->sync_buff_lock); |
1da177e4 | 1836 | |
998e7a76 SW |
1837 | /* increase the module use count */ |
1838 | ip_vs_use_count_inc(); | |
1da177e4 LT |
1839 | |
1840 | return 0; | |
1da177e4 | 1841 | |
998e7a76 | 1842 | outsocket: |
26abe143 | 1843 | sock_release(sock); |
f73181c8 PNA |
1844 | |
1845 | outtinfo: | |
1846 | if (tinfo) { | |
26abe143 | 1847 | sock_release(tinfo->sock); |
f73181c8 PNA |
1848 | kfree(tinfo->buf); |
1849 | kfree(tinfo); | |
1850 | } | |
1851 | count = id; | |
1852 | while (count-- > 0) { | |
1853 | if (state == IP_VS_STATE_MASTER) | |
1854 | kthread_stop(ipvs->ms[count].master_thread); | |
1855 | else | |
1856 | kthread_stop(array[count]); | |
1857 | } | |
1858 | kfree(array); | |
1859 | ||
998e7a76 | 1860 | out: |
f73181c8 PNA |
1861 | if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) { |
1862 | kfree(ipvs->ms); | |
1863 | ipvs->ms = NULL; | |
1864 | } | |
998e7a76 | 1865 | return result; |
1da177e4 LT |
1866 | } |
1867 | ||
1868 | ||
f131315f | 1869 | int stop_sync_thread(struct net *net, int state) |
1da177e4 | 1870 | { |
f131315f | 1871 | struct netns_ipvs *ipvs = net_ipvs(net); |
f73181c8 PNA |
1872 | struct task_struct **array; |
1873 | int id; | |
1ae132b0 | 1874 | int retc = -EINVAL; |
f131315f | 1875 | |
1e3e238e | 1876 | IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current)); |
1da177e4 | 1877 | |
1da177e4 | 1878 | if (state == IP_VS_STATE_MASTER) { |
f73181c8 | 1879 | if (!ipvs->ms) |
998e7a76 | 1880 | return -ESRCH; |
cc0191ae | 1881 | |
998e7a76 SW |
1882 | /* |
1883 | * The lock synchronizes with sb_queue_tail(), so that we don't | |
1884 | * add sync buffers to the queue, when we are already in | |
1885 | * progress of stopping the master sync daemon. | |
1886 | */ | |
1da177e4 | 1887 | |
f73181c8 PNA |
1888 | spin_lock_bh(&ipvs->sync_buff_lock); |
1889 | spin_lock(&ipvs->sync_lock); | |
f131315f | 1890 | ipvs->sync_state &= ~IP_VS_STATE_MASTER; |
f73181c8 PNA |
1891 | spin_unlock(&ipvs->sync_lock); |
1892 | spin_unlock_bh(&ipvs->sync_buff_lock); | |
1893 | ||
1894 | retc = 0; | |
1895 | for (id = ipvs->threads_mask; id >= 0; id--) { | |
1896 | struct ipvs_master_sync_state *ms = &ipvs->ms[id]; | |
1897 | int ret; | |
1898 | ||
1899 | pr_info("stopping master sync thread %d ...\n", | |
1900 | task_pid_nr(ms->master_thread)); | |
1901 | cancel_delayed_work_sync(&ms->master_wakeup_work); | |
1902 | ret = kthread_stop(ms->master_thread); | |
1903 | if (retc >= 0) | |
1904 | retc = ret; | |
1905 | } | |
1906 | kfree(ipvs->ms); | |
1907 | ipvs->ms = NULL; | |
998e7a76 | 1908 | } else if (state == IP_VS_STATE_BACKUP) { |
f73181c8 | 1909 | if (!ipvs->backup_threads) |
998e7a76 SW |
1910 | return -ESRCH; |
1911 | ||
f131315f | 1912 | ipvs->sync_state &= ~IP_VS_STATE_BACKUP; |
f73181c8 PNA |
1913 | array = ipvs->backup_threads; |
1914 | retc = 0; | |
1915 | for (id = ipvs->threads_mask; id >= 0; id--) { | |
1916 | int ret; | |
1917 | ||
1918 | pr_info("stopping backup sync thread %d ...\n", | |
1919 | task_pid_nr(array[id])); | |
1920 | ret = kthread_stop(array[id]); | |
1921 | if (retc >= 0) | |
1922 | retc = ret; | |
1923 | } | |
1924 | kfree(array); | |
1925 | ipvs->backup_threads = NULL; | |
998e7a76 | 1926 | } |
1da177e4 | 1927 | |
998e7a76 SW |
1928 | /* decrease the module use count */ |
1929 | ip_vs_use_count_dec(); | |
1da177e4 | 1930 | |
1ae132b0 | 1931 | return retc; |
1da177e4 | 1932 | } |
61b1ab45 HS |
1933 | |
1934 | /* | |
1935 | * Initialize data struct for each netns | |
1936 | */ | |
503cf15a | 1937 | int __net_init ip_vs_sync_net_init(struct net *net) |
61b1ab45 | 1938 | { |
f131315f HS |
1939 | struct netns_ipvs *ipvs = net_ipvs(net); |
1940 | ||
ae1d48b2 | 1941 | __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key); |
f131315f HS |
1942 | spin_lock_init(&ipvs->sync_lock); |
1943 | spin_lock_init(&ipvs->sync_buff_lock); | |
61b1ab45 HS |
1944 | return 0; |
1945 | } | |
1946 | ||
503cf15a | 1947 | void ip_vs_sync_net_cleanup(struct net *net) |
61b1ab45 | 1948 | { |
1ae132b0 | 1949 | int retc; |
ae1d48b2 | 1950 | struct netns_ipvs *ipvs = net_ipvs(net); |
1ae132b0 | 1951 | |
ae1d48b2 | 1952 | mutex_lock(&ipvs->sync_mutex); |
1ae132b0 HS |
1953 | retc = stop_sync_thread(net, IP_VS_STATE_MASTER); |
1954 | if (retc && retc != -ESRCH) | |
1955 | pr_err("Failed to stop Master Daemon\n"); | |
1956 | ||
1957 | retc = stop_sync_thread(net, IP_VS_STATE_BACKUP); | |
1958 | if (retc && retc != -ESRCH) | |
1959 | pr_err("Failed to stop Backup Daemon\n"); | |
ae1d48b2 | 1960 | mutex_unlock(&ipvs->sync_mutex); |
61b1ab45 | 1961 | } |