1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * IPVS An implementation of the IP virtual server support for the
4 * LINUX operating system. IPVS is now implemented as a module
5 * over the NetFilter framework. IPVS can be used to build a
6 * high-performance and highly available server based on a
7 * cluster of servers.
8 *
9 * Version 1, is capable of handling both version 0 and 1 messages.
10 * Version 0 is the plain old format.
11 * Note Version 0 receivers will just drop Ver 1 messages.
12 * Version 1 is capable of handle IPv6, Persistence data,
13 * time-outs, and firewall marks.
14 * In ver.1 "ip_vs_sync_conn_options" will be sent in netw. order.
15 * Ver. 0 can be turned on by sysctl -w net.ipv4.vs.sync_version=0
16 *
17 * Definitions Message: is a complete datagram
18 * Sync_conn: is a part of a Message
19 * Param Data is an option to a Sync_conn.
20 *
21 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
22 *
23 * ip_vs_sync: sync connection info from master load balancer to backups
24 * through multicast
25 *
26 * Changes:
27 * Alexandre Cassen : Added master & backup support at a time.
28 * Alexandre Cassen : Added SyncID support for incoming sync
29 * messages filtering.
30 * Justin Ossevoort : Fix endian problem on sync message size.
31 * Hans Schillstrom : Added Version 1: i.e. IPv6,
32 * Persistence support, fwmark and time-out.
33 */
34
35 #define KMSG_COMPONENT "IPVS"
36 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
37
38 #include <linux/module.h>
39 #include <linux/slab.h>
40 #include <linux/inetdevice.h>
41 #include <linux/net.h>
42 #include <linux/completion.h>
43 #include <linux/delay.h>
44 #include <linux/skbuff.h>
45 #include <linux/in.h>
46 #include <linux/igmp.h> /* for ip_mc_join_group */
47 #include <linux/udp.h>
48 #include <linux/err.h>
49 #include <linux/kthread.h>
50 #include <linux/wait.h>
51 #include <linux/kernel.h>
52 #include <linux/sched/signal.h>
53
54 #include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */
55
56 #include <net/ip.h>
57 #include <net/sock.h>
58
59 #include <net/ip_vs.h>
60
61 #define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */
62 #define IP_VS_SYNC_PORT 8848 /* multicast port */
63
64 #define SYNC_PROTO_VER 1 /* Protocol version in header */
65
66 static struct lock_class_key __ipvs_sync_key;
67 /*
68 * IPVS sync connection entry
69 * Version 0, i.e. original version.
70 */
71 struct ip_vs_sync_conn_v0 {
72 __u8 reserved;
73
74 /* Protocol, addresses and port numbers */
75 __u8 protocol; /* Which protocol (TCP/UDP) */
76 __be16 cport;
77 __be16 vport;
78 __be16 dport;
79 __be32 caddr; /* client address */
80 __be32 vaddr; /* virtual address */
81 __be32 daddr; /* destination address */
82
83 /* Flags and state transition */
84 __be16 flags; /* status flags */
85 __be16 state; /* state info */
86
87 /* The sequence options start here */
88 };
89
90 struct ip_vs_sync_conn_options {
91 struct ip_vs_seq in_seq; /* incoming seq. struct */
92 struct ip_vs_seq out_seq; /* outgoing seq. struct */
93 };
94
95 /*
96 Sync Connection format (sync_conn)
97
98 0 1 2 3
99 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
100 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
101 | Type | Protocol | Ver. | Size |
102 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
103 | Flags |
104 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
105 | State | cport |
106 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
107 | vport | dport |
108 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
109 | fwmark |
110 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
111 | timeout (in sec.) |
112 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
113 | ... |
114 | IP-Addresses (v4 or v6) |
115 | ... |
116 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
117 Optional Parameters.
118 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
119 | Param. Type | Param. Length | Param. data |
120 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
121 | ... |
122 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
123 | | Param Type | Param. Length |
124 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
125 | Param data |
126 | Last Param data should be padded for 32 bit alignment |
127 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
128 */
129
130 /*
131 * Type 0, IPv4 sync connection format
132 */
133 struct ip_vs_sync_v4 {
134 __u8 type;
135 __u8 protocol; /* Which protocol (TCP/UDP) */
136 __be16 ver_size; /* Version msb 4 bits */
137 /* Flags and state transition */
138 __be32 flags; /* status flags */
139 __be16 state; /* state info */
140 /* Protocol, addresses and port numbers */
141 __be16 cport;
142 __be16 vport;
143 __be16 dport;
144 __be32 fwmark; /* Firewall mark from skb */
145 __be32 timeout; /* cp timeout */
146 __be32 caddr; /* client address */
147 __be32 vaddr; /* virtual address */
148 __be32 daddr; /* destination address */
149 /* The sequence options start here */
150 /* PE data padded to 32bit alignment after seq. options */
151 };
152 /*
153 * Type 2 messages IPv6
154 */
155 struct ip_vs_sync_v6 {
156 __u8 type;
157 __u8 protocol; /* Which protocol (TCP/UDP) */
158 __be16 ver_size; /* Version msb 4 bits */
159 /* Flags and state transition */
160 __be32 flags; /* status flags */
161 __be16 state; /* state info */
162 /* Protocol, addresses and port numbers */
163 __be16 cport;
164 __be16 vport;
165 __be16 dport;
166 __be32 fwmark; /* Firewall mark from skb */
167 __be32 timeout; /* cp timeout */
168 struct in6_addr caddr; /* client address */
169 struct in6_addr vaddr; /* virtual address */
170 struct in6_addr daddr; /* destination address */
171 /* The sequence options start here */
172 /* PE data padded to 32bit alignment after seq. options */
173 };
174
175 union ip_vs_sync_conn {
176 struct ip_vs_sync_v4 v4;
177 struct ip_vs_sync_v6 v6;
178 };
179
180 /* Bits in Type field in above */
181 #define STYPE_INET6 0
182 #define STYPE_F_INET6 (1 << STYPE_INET6)
183
184 #define SVER_SHIFT 12 /* Shift to get version */
185 #define SVER_MASK 0x0fff /* Mask to strip version */
186
187 #define IPVS_OPT_SEQ_DATA 1
188 #define IPVS_OPT_PE_DATA 2
189 #define IPVS_OPT_PE_NAME 3
190 #define IPVS_OPT_PARAM 7
191
192 #define IPVS_OPT_F_SEQ_DATA (1 << (IPVS_OPT_SEQ_DATA-1))
193 #define IPVS_OPT_F_PE_DATA (1 << (IPVS_OPT_PE_DATA-1))
194 #define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME-1))
195 #define IPVS_OPT_F_PARAM (1 << (IPVS_OPT_PARAM-1))
196
197 struct ip_vs_sync_thread_data {
198 struct netns_ipvs *ipvs;
199 struct socket *sock;
200 char *buf;
201 int id;
202 };
203
204 /* Version 0 definition of packet sizes */
205 #define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0))
206 #define FULL_CONN_SIZE \
207 (sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options))
208
209
210 /*
211 The master mulitcasts messages (Datagrams) to the backup load balancers
212 in the following format.
213
214 Version 1:
215 Note, first byte should be Zero, so ver 0 receivers will drop the packet.
216
217 0 1 2 3
218 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
219 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
220 | 0 | SyncID | Size |
221 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
222 | Count Conns | Version | Reserved, set to Zero |
223 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
224 | |
225 | IPVS Sync Connection (1) |
226 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
227 | . |
228 ~ . ~
229 | . |
230 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
231 | |
232 | IPVS Sync Connection (n) |
233 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
234
235 Version 0 Header
236 0 1 2 3
237 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
238 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
239 | Count Conns | SyncID | Size |
240 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
241 | IPVS Sync Connection (1) |
242 */
243
244 #define SYNC_MESG_HEADER_LEN 4
245 #define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */
246
247 /* Version 0 header */
248 struct ip_vs_sync_mesg_v0 {
249 __u8 nr_conns;
250 __u8 syncid;
251 __be16 size;
252
253 /* ip_vs_sync_conn entries start here */
254 };
255
256 /* Version 1 header */
257 struct ip_vs_sync_mesg {
258 __u8 reserved; /* must be zero */
259 __u8 syncid;
260 __be16 size;
261 __u8 nr_conns;
262 __s8 version; /* SYNC_PROTO_VER */
263 __u16 spare;
264 /* ip_vs_sync_conn entries start here */
265 };
266
267 union ipvs_sockaddr {
268 struct sockaddr_in in;
269 struct sockaddr_in6 in6;
270 };
271
272 struct ip_vs_sync_buff {
273 struct list_head list;
274 unsigned long firstuse;
275
276 /* pointers for the message data */
277 struct ip_vs_sync_mesg *mesg;
278 unsigned char *head;
279 unsigned char *end;
280 };
281
282 /*
283 * Copy of struct ip_vs_seq
284 * From unaligned network order to aligned host order
285 */
ntoh_seq(struct ip_vs_seq * no,struct ip_vs_seq * ho)286 static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho)
287 {
288 memset(ho, 0, sizeof(*ho));
289 ho->init_seq = get_unaligned_be32(&no->init_seq);
290 ho->delta = get_unaligned_be32(&no->delta);
291 ho->previous_delta = get_unaligned_be32(&no->previous_delta);
292 }
293
294 /*
295 * Copy of struct ip_vs_seq
296 * From Aligned host order to unaligned network order
297 */
hton_seq(struct ip_vs_seq * ho,struct ip_vs_seq * no)298 static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no)
299 {
300 put_unaligned_be32(ho->init_seq, &no->init_seq);
301 put_unaligned_be32(ho->delta, &no->delta);
302 put_unaligned_be32(ho->previous_delta, &no->previous_delta);
303 }
304
305 static inline struct ip_vs_sync_buff *
sb_dequeue(struct netns_ipvs * ipvs,struct ipvs_master_sync_state * ms)306 sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
307 {
308 struct ip_vs_sync_buff *sb;
309
310 spin_lock_bh(&ipvs->sync_lock);
311 if (list_empty(&ms->sync_queue)) {
312 sb = NULL;
313 __set_current_state(TASK_INTERRUPTIBLE);
314 } else {
315 sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff,
316 list);
317 list_del(&sb->list);
318 ms->sync_queue_len--;
319 if (!ms->sync_queue_len)
320 ms->sync_queue_delay = 0;
321 }
322 spin_unlock_bh(&ipvs->sync_lock);
323
324 return sb;
325 }
326
327 /*
328 * Create a new sync buffer for Version 1 proto.
329 */
330 static inline struct ip_vs_sync_buff *
ip_vs_sync_buff_create(struct netns_ipvs * ipvs,unsigned int len)331 ip_vs_sync_buff_create(struct netns_ipvs *ipvs, unsigned int len)
332 {
333 struct ip_vs_sync_buff *sb;
334
335 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
336 return NULL;
337
338 len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),
339 ipvs->mcfg.sync_maxlen);
340 sb->mesg = kmalloc(len, GFP_ATOMIC);
341 if (!sb->mesg) {
342 kfree(sb);
343 return NULL;
344 }
345 sb->mesg->reserved = 0; /* old nr_conns i.e. must be zero now */
346 sb->mesg->version = SYNC_PROTO_VER;
347 sb->mesg->syncid = ipvs->mcfg.syncid;
348 sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
349 sb->mesg->nr_conns = 0;
350 sb->mesg->spare = 0;
351 sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
352 sb->end = (unsigned char *)sb->mesg + len;
353
354 sb->firstuse = jiffies;
355 return sb;
356 }
357
ip_vs_sync_buff_release(struct ip_vs_sync_buff * sb)358 static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
359 {
360 kfree(sb->mesg);
361 kfree(sb);
362 }
363
sb_queue_tail(struct netns_ipvs * ipvs,struct ipvs_master_sync_state * ms)364 static inline void sb_queue_tail(struct netns_ipvs *ipvs,
365 struct ipvs_master_sync_state *ms)
366 {
367 struct ip_vs_sync_buff *sb = ms->sync_buff;
368
369 spin_lock(&ipvs->sync_lock);
370 if (ipvs->sync_state & IP_VS_STATE_MASTER &&
371 ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) {
372 if (!ms->sync_queue_len)
373 schedule_delayed_work(&ms->master_wakeup_work,
374 max(IPVS_SYNC_SEND_DELAY, 1));
375 ms->sync_queue_len++;
376 list_add_tail(&sb->list, &ms->sync_queue);
377 if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE)
378 wake_up_process(ms->master_thread);
379 } else
380 ip_vs_sync_buff_release(sb);
381 spin_unlock(&ipvs->sync_lock);
382 }
383
384 /*
385 * Get the current sync buffer if it has been created for more
386 * than the specified time or the specified time is zero.
387 */
388 static inline struct ip_vs_sync_buff *
get_curr_sync_buff(struct netns_ipvs * ipvs,struct ipvs_master_sync_state * ms,unsigned long time)389 get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms,
390 unsigned long time)
391 {
392 struct ip_vs_sync_buff *sb;
393
394 spin_lock_bh(&ipvs->sync_buff_lock);
395 sb = ms->sync_buff;
396 if (sb && time_after_eq(jiffies - sb->firstuse, time)) {
397 ms->sync_buff = NULL;
398 __set_current_state(TASK_RUNNING);
399 } else
400 sb = NULL;
401 spin_unlock_bh(&ipvs->sync_buff_lock);
402 return sb;
403 }
404
405 static inline int
select_master_thread_id(struct netns_ipvs * ipvs,struct ip_vs_conn * cp)406 select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
407 {
408 return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask;
409 }
410
411 /*
412 * Create a new sync buffer for Version 0 proto.
413 */
414 static inline struct ip_vs_sync_buff *
ip_vs_sync_buff_create_v0(struct netns_ipvs * ipvs,unsigned int len)415 ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs, unsigned int len)
416 {
417 struct ip_vs_sync_buff *sb;
418 struct ip_vs_sync_mesg_v0 *mesg;
419
420 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
421 return NULL;
422
423 len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),
424 ipvs->mcfg.sync_maxlen);
425 sb->mesg = kmalloc(len, GFP_ATOMIC);
426 if (!sb->mesg) {
427 kfree(sb);
428 return NULL;
429 }
430 mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
431 mesg->nr_conns = 0;
432 mesg->syncid = ipvs->mcfg.syncid;
433 mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
434 sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
435 sb->end = (unsigned char *)mesg + len;
436 sb->firstuse = jiffies;
437 return sb;
438 }
439
440 /* Check if connection is controlled by persistence */
in_persistence(struct ip_vs_conn * cp)441 static inline bool in_persistence(struct ip_vs_conn *cp)
442 {
443 for (cp = cp->control; cp; cp = cp->control) {
444 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
445 return true;
446 }
447 return false;
448 }
449
450 /* Check if conn should be synced.
451 * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
452 * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
453 * sync_retries times with period of sync_refresh_period/8
454 * - (2) if both sync_refresh_period and sync_period are 0 send sync only
455 * for state changes or only once when pkts matches sync_threshold
456 * - (3) templates: rate can be reduced only with sync_refresh_period or
457 * with (2)
458 */
ip_vs_sync_conn_needed(struct netns_ipvs * ipvs,struct ip_vs_conn * cp,int pkts)459 static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
460 struct ip_vs_conn *cp, int pkts)
461 {
462 unsigned long orig = READ_ONCE(cp->sync_endtime);
463 unsigned long now = jiffies;
464 unsigned long n = (now + cp->timeout) & ~3UL;
465 unsigned int sync_refresh_period;
466 int sync_period;
467 int force;
468
469 /* Check if we sync in current state */
470 if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
471 force = 0;
472 else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp)))
473 return 0;
474 else if (likely(cp->protocol == IPPROTO_TCP)) {
475 if (!((1 << cp->state) &
476 ((1 << IP_VS_TCP_S_ESTABLISHED) |
477 (1 << IP_VS_TCP_S_FIN_WAIT) |
478 (1 << IP_VS_TCP_S_CLOSE) |
479 (1 << IP_VS_TCP_S_CLOSE_WAIT) |
480 (1 << IP_VS_TCP_S_TIME_WAIT))))
481 return 0;
482 force = cp->state != cp->old_state;
483 if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
484 goto set;
485 } else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
486 if (!((1 << cp->state) &
487 ((1 << IP_VS_SCTP_S_ESTABLISHED) |
488 (1 << IP_VS_SCTP_S_SHUTDOWN_SENT) |
489 (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) |
490 (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) |
491 (1 << IP_VS_SCTP_S_CLOSED))))
492 return 0;
493 force = cp->state != cp->old_state;
494 if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
495 goto set;
496 } else {
497 /* UDP or another protocol with single state */
498 force = 0;
499 }
500
501 sync_refresh_period = sysctl_sync_refresh_period(ipvs);
502 if (sync_refresh_period > 0) {
503 long diff = n - orig;
504 long min_diff = max(cp->timeout >> 1, 10UL * HZ);
505
506 /* Avoid sync if difference is below sync_refresh_period
507 * and below the half timeout.
508 */
509 if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
510 int retries = orig & 3;
511
512 if (retries >= sysctl_sync_retries(ipvs))
513 return 0;
514 if (time_before(now, orig - cp->timeout +
515 (sync_refresh_period >> 3)))
516 return 0;
517 n |= retries + 1;
518 }
519 }
520 sync_period = sysctl_sync_period(ipvs);
521 if (sync_period > 0) {
522 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
523 pkts % sync_period != sysctl_sync_threshold(ipvs))
524 return 0;
525 } else if (!sync_refresh_period &&
526 pkts != sysctl_sync_threshold(ipvs))
527 return 0;
528
529 set:
530 cp->old_state = cp->state;
531 n = cmpxchg(&cp->sync_endtime, orig, n);
532 return n == orig || force;
533 }
534
535 /*
536 * Version 0 , could be switched in by sys_ctl.
537 * Add an ip_vs_conn information into the current sync_buff.
538 */
ip_vs_sync_conn_v0(struct netns_ipvs * ipvs,struct ip_vs_conn * cp,int pkts)539 static void ip_vs_sync_conn_v0(struct netns_ipvs *ipvs, struct ip_vs_conn *cp,
540 int pkts)
541 {
542 struct ip_vs_sync_mesg_v0 *m;
543 struct ip_vs_sync_conn_v0 *s;
544 struct ip_vs_sync_buff *buff;
545 struct ipvs_master_sync_state *ms;
546 int id;
547 unsigned int len;
548
549 if (unlikely(cp->af != AF_INET))
550 return;
551 /* Do not sync ONE PACKET */
552 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
553 return;
554
555 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
556 return;
557
558 spin_lock_bh(&ipvs->sync_buff_lock);
559 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
560 spin_unlock_bh(&ipvs->sync_buff_lock);
561 return;
562 }
563
564 id = select_master_thread_id(ipvs, cp);
565 ms = &ipvs->ms[id];
566 buff = ms->sync_buff;
567 len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
568 SIMPLE_CONN_SIZE;
569 if (buff) {
570 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
571 /* Send buffer if it is for v1 */
572 if (buff->head + len > buff->end || !m->nr_conns) {
573 sb_queue_tail(ipvs, ms);
574 ms->sync_buff = NULL;
575 buff = NULL;
576 }
577 }
578 if (!buff) {
579 buff = ip_vs_sync_buff_create_v0(ipvs, len);
580 if (!buff) {
581 spin_unlock_bh(&ipvs->sync_buff_lock);
582 pr_err("ip_vs_sync_buff_create failed.\n");
583 return;
584 }
585 ms->sync_buff = buff;
586 }
587
588 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
589 s = (struct ip_vs_sync_conn_v0 *) buff->head;
590
591 /* copy members */
592 s->reserved = 0;
593 s->protocol = cp->protocol;
594 s->cport = cp->cport;
595 s->vport = cp->vport;
596 s->dport = cp->dport;
597 s->caddr = cp->caddr.ip;
598 s->vaddr = cp->vaddr.ip;
599 s->daddr = cp->daddr.ip;
600 s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
601 s->state = htons(cp->state);
602 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
603 struct ip_vs_sync_conn_options *opt =
604 (struct ip_vs_sync_conn_options *)&s[1];
605 memcpy(opt, &cp->in_seq, sizeof(*opt));
606 }
607
608 m->nr_conns++;
609 m->size = htons(ntohs(m->size) + len);
610 buff->head += len;
611 spin_unlock_bh(&ipvs->sync_buff_lock);
612
613 /* synchronize its controller if it has */
614 cp = cp->control;
615 if (cp) {
616 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
617 pkts = atomic_add_return(1, &cp->in_pkts);
618 else
619 pkts = sysctl_sync_threshold(ipvs);
620 ip_vs_sync_conn(ipvs, cp, pkts);
621 }
622 }
623
624 /*
625 * Add an ip_vs_conn information into the current sync_buff.
626 * Called by ip_vs_in.
627 * Sending Version 1 messages
628 */
ip_vs_sync_conn(struct netns_ipvs * ipvs,struct ip_vs_conn * cp,int pkts)629 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts)
630 {
631 struct ip_vs_sync_mesg *m;
632 union ip_vs_sync_conn *s;
633 struct ip_vs_sync_buff *buff;
634 struct ipvs_master_sync_state *ms;
635 int id;
636 __u8 *p;
637 unsigned int len, pe_name_len, pad;
638
639 /* Handle old version of the protocol */
640 if (sysctl_sync_ver(ipvs) == 0) {
641 ip_vs_sync_conn_v0(ipvs, cp, pkts);
642 return;
643 }
644 /* Do not sync ONE PACKET */
645 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
646 goto control;
647 sloop:
648 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
649 goto control;
650
651 /* Sanity checks */
652 pe_name_len = 0;
653 if (cp->pe_data_len) {
654 if (!cp->pe_data || !cp->dest) {
655 IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
656 return;
657 }
658 pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN);
659 }
660
661 spin_lock_bh(&ipvs->sync_buff_lock);
662 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
663 spin_unlock_bh(&ipvs->sync_buff_lock);
664 return;
665 }
666
667 id = select_master_thread_id(ipvs, cp);
668 ms = &ipvs->ms[id];
669
670 #ifdef CONFIG_IP_VS_IPV6
671 if (cp->af == AF_INET6)
672 len = sizeof(struct ip_vs_sync_v6);
673 else
674 #endif
675 len = sizeof(struct ip_vs_sync_v4);
676
677 if (cp->flags & IP_VS_CONN_F_SEQ_MASK)
678 len += sizeof(struct ip_vs_sync_conn_options) + 2;
679
680 if (cp->pe_data_len)
681 len += cp->pe_data_len + 2; /* + Param hdr field */
682 if (pe_name_len)
683 len += pe_name_len + 2;
684
685 /* check if there is a space for this one */
686 pad = 0;
687 buff = ms->sync_buff;
688 if (buff) {
689 m = buff->mesg;
690 pad = (4 - (size_t) buff->head) & 3;
691 /* Send buffer if it is for v0 */
692 if (buff->head + len + pad > buff->end || m->reserved) {
693 sb_queue_tail(ipvs, ms);
694 ms->sync_buff = NULL;
695 buff = NULL;
696 pad = 0;
697 }
698 }
699
700 if (!buff) {
701 buff = ip_vs_sync_buff_create(ipvs, len);
702 if (!buff) {
703 spin_unlock_bh(&ipvs->sync_buff_lock);
704 pr_err("ip_vs_sync_buff_create failed.\n");
705 return;
706 }
707 ms->sync_buff = buff;
708 m = buff->mesg;
709 }
710
711 p = buff->head;
712 buff->head += pad + len;
713 m->size = htons(ntohs(m->size) + pad + len);
714 /* Add ev. padding from prev. sync_conn */
715 while (pad--)
716 *(p++) = 0;
717
718 s = (union ip_vs_sync_conn *)p;
719
720 /* Set message type & copy members */
721 s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0);
722 s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */
723 s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED);
724 s->v4.state = htons(cp->state);
725 s->v4.protocol = cp->protocol;
726 s->v4.cport = cp->cport;
727 s->v4.vport = cp->vport;
728 s->v4.dport = cp->dport;
729 s->v4.fwmark = htonl(cp->fwmark);
730 s->v4.timeout = htonl(cp->timeout / HZ);
731 m->nr_conns++;
732
733 #ifdef CONFIG_IP_VS_IPV6
734 if (cp->af == AF_INET6) {
735 p += sizeof(struct ip_vs_sync_v6);
736 s->v6.caddr = cp->caddr.in6;
737 s->v6.vaddr = cp->vaddr.in6;
738 s->v6.daddr = cp->daddr.in6;
739 } else
740 #endif
741 {
742 p += sizeof(struct ip_vs_sync_v4); /* options ptr */
743 s->v4.caddr = cp->caddr.ip;
744 s->v4.vaddr = cp->vaddr.ip;
745 s->v4.daddr = cp->daddr.ip;
746 }
747 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
748 *(p++) = IPVS_OPT_SEQ_DATA;
749 *(p++) = sizeof(struct ip_vs_sync_conn_options);
750 hton_seq((struct ip_vs_seq *)p, &cp->in_seq);
751 p += sizeof(struct ip_vs_seq);
752 hton_seq((struct ip_vs_seq *)p, &cp->out_seq);
753 p += sizeof(struct ip_vs_seq);
754 }
755 /* Handle pe data */
756 if (cp->pe_data_len && cp->pe_data) {
757 *(p++) = IPVS_OPT_PE_DATA;
758 *(p++) = cp->pe_data_len;
759 memcpy(p, cp->pe_data, cp->pe_data_len);
760 p += cp->pe_data_len;
761 if (pe_name_len) {
762 /* Add PE_NAME */
763 *(p++) = IPVS_OPT_PE_NAME;
764 *(p++) = pe_name_len;
765 memcpy(p, cp->pe->name, pe_name_len);
766 p += pe_name_len;
767 }
768 }
769
770 spin_unlock_bh(&ipvs->sync_buff_lock);
771
772 control:
773 /* synchronize its controller if it has */
774 cp = cp->control;
775 if (!cp)
776 return;
777 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
778 pkts = atomic_add_return(1, &cp->in_pkts);
779 else
780 pkts = sysctl_sync_threshold(ipvs);
781 goto sloop;
782 }
783
784 /*
785 * fill_param used by version 1
786 */
787 static inline int
ip_vs_conn_fill_param_sync(struct netns_ipvs * ipvs,int af,union ip_vs_sync_conn * sc,struct ip_vs_conn_param * p,__u8 * pe_data,unsigned int pe_data_len,__u8 * pe_name,unsigned int pe_name_len)788 ip_vs_conn_fill_param_sync(struct netns_ipvs *ipvs, int af, union ip_vs_sync_conn *sc,
789 struct ip_vs_conn_param *p,
790 __u8 *pe_data, unsigned int pe_data_len,
791 __u8 *pe_name, unsigned int pe_name_len)
792 {
793 #ifdef CONFIG_IP_VS_IPV6
794 if (af == AF_INET6)
795 ip_vs_conn_fill_param(ipvs, af, sc->v6.protocol,
796 (const union nf_inet_addr *)&sc->v6.caddr,
797 sc->v6.cport,
798 (const union nf_inet_addr *)&sc->v6.vaddr,
799 sc->v6.vport, p);
800 else
801 #endif
802 ip_vs_conn_fill_param(ipvs, af, sc->v4.protocol,
803 (const union nf_inet_addr *)&sc->v4.caddr,
804 sc->v4.cport,
805 (const union nf_inet_addr *)&sc->v4.vaddr,
806 sc->v4.vport, p);
807 /* Handle pe data */
808 if (pe_data_len) {
809 if (pe_name_len) {
810 char buff[IP_VS_PENAME_MAXLEN+1];
811
812 memcpy(buff, pe_name, pe_name_len);
813 buff[pe_name_len]=0;
814 p->pe = __ip_vs_pe_getbyname(buff);
815 if (!p->pe) {
816 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
817 buff);
818 return 1;
819 }
820 } else {
821 IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
822 return 1;
823 }
824
825 p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC);
826 if (!p->pe_data) {
827 module_put(p->pe->module);
828 return -ENOMEM;
829 }
830 p->pe_data_len = pe_data_len;
831 }
832 return 0;
833 }
834
835 /*
836 * Connection Add / Update.
837 * Common for version 0 and 1 reception of backup sync_conns.
838 * Param: ...
839 * timeout is in sec.
840 */
ip_vs_proc_conn(struct netns_ipvs * ipvs,struct ip_vs_conn_param * param,unsigned int flags,unsigned int state,unsigned int protocol,unsigned int type,const union nf_inet_addr * daddr,__be16 dport,unsigned long timeout,__u32 fwmark,struct ip_vs_sync_conn_options * opt)841 static void ip_vs_proc_conn(struct netns_ipvs *ipvs, struct ip_vs_conn_param *param,
842 unsigned int flags, unsigned int state,
843 unsigned int protocol, unsigned int type,
844 const union nf_inet_addr *daddr, __be16 dport,
845 unsigned long timeout, __u32 fwmark,
846 struct ip_vs_sync_conn_options *opt)
847 {
848 struct ip_vs_dest *dest;
849 struct ip_vs_conn *cp;
850
851 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
852 cp = ip_vs_conn_in_get(param);
853 if (cp && ((cp->dport != dport) ||
854 !ip_vs_addr_equal(cp->daf, &cp->daddr, daddr))) {
855 if (!(flags & IP_VS_CONN_F_INACTIVE)) {
856 ip_vs_conn_expire_now(cp);
857 __ip_vs_conn_put(cp);
858 cp = NULL;
859 } else {
860 /* This is the expiration message for the
861 * connection that was already replaced, so we
862 * just ignore it.
863 */
864 __ip_vs_conn_put(cp);
865 kfree(param->pe_data);
866 return;
867 }
868 }
869 } else {
870 cp = ip_vs_ct_in_get(param);
871 }
872
873 if (cp) {
874 /* Free pe_data */
875 kfree(param->pe_data);
876
877 dest = cp->dest;
878 spin_lock_bh(&cp->lock);
879 if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE &&
880 !(flags & IP_VS_CONN_F_TEMPLATE) && dest) {
881 if (flags & IP_VS_CONN_F_INACTIVE) {
882 atomic_dec(&dest->activeconns);
883 atomic_inc(&dest->inactconns);
884 } else {
885 atomic_inc(&dest->activeconns);
886 atomic_dec(&dest->inactconns);
887 }
888 }
889 flags &= IP_VS_CONN_F_BACKUP_UPD_MASK;
890 flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK;
891 cp->flags = flags;
892 spin_unlock_bh(&cp->lock);
893 if (!dest)
894 ip_vs_try_bind_dest(cp);
895 } else {
896 /*
897 * Find the appropriate destination for the connection.
898 * If it is not found the connection will remain unbound
899 * but still handled.
900 */
901 rcu_read_lock();
902 /* This function is only invoked by the synchronization
903 * code. We do not currently support heterogeneous pools
904 * with synchronization, so we can make the assumption that
905 * the svc_af is the same as the dest_af
906 */
907 dest = ip_vs_find_dest(ipvs, type, type, daddr, dport,
908 param->vaddr, param->vport, protocol,
909 fwmark, flags);
910
911 cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest,
912 fwmark);
913 rcu_read_unlock();
914 if (!cp) {
915 kfree(param->pe_data);
916 IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
917 return;
918 }
919 if (!(flags & IP_VS_CONN_F_TEMPLATE))
920 kfree(param->pe_data);
921 }
922
923 if (opt) {
924 cp->in_seq = opt->in_seq;
925 cp->out_seq = opt->out_seq;
926 }
927 atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs));
928 cp->state = state;
929 cp->old_state = cp->state;
930 /*
931 * For Ver 0 messages style
932 * - Not possible to recover the right timeout for templates
933 * - can not find the right fwmark
934 * virtual service. If needed, we can do it for
935 * non-fwmark persistent services.
936 * Ver 1 messages style.
937 * - No problem.
938 */
939 if (timeout) {
940 if (timeout > MAX_SCHEDULE_TIMEOUT / HZ)
941 timeout = MAX_SCHEDULE_TIMEOUT / HZ;
942 cp->timeout = timeout*HZ;
943 } else {
944 struct ip_vs_proto_data *pd;
945
946 pd = ip_vs_proto_data_get(ipvs, protocol);
947 if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table)
948 cp->timeout = pd->timeout_table[state];
949 else
950 cp->timeout = (3*60*HZ);
951 }
952 ip_vs_conn_put(cp);
953 }
954
955 /*
956 * Process received multicast message for Version 0
957 */
ip_vs_process_message_v0(struct netns_ipvs * ipvs,const char * buffer,const size_t buflen)958 static void ip_vs_process_message_v0(struct netns_ipvs *ipvs, const char *buffer,
959 const size_t buflen)
960 {
961 struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer;
962 struct ip_vs_sync_conn_v0 *s;
963 struct ip_vs_sync_conn_options *opt;
964 struct ip_vs_protocol *pp;
965 struct ip_vs_conn_param param;
966 char *p;
967 int i;
968
969 p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0);
970 for (i=0; i<m->nr_conns; i++) {
971 unsigned int flags, state;
972
973 if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
974 IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
975 return;
976 }
977 s = (struct ip_vs_sync_conn_v0 *) p;
978 flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
979 flags &= ~IP_VS_CONN_F_HASHED;
980 if (flags & IP_VS_CONN_F_SEQ_MASK) {
981 opt = (struct ip_vs_sync_conn_options *)&s[1];
982 p += FULL_CONN_SIZE;
983 if (p > buffer+buflen) {
984 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
985 return;
986 }
987 } else {
988 opt = NULL;
989 p += SIMPLE_CONN_SIZE;
990 }
991
992 state = ntohs(s->state);
993 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
994 pp = ip_vs_proto_get(s->protocol);
995 if (!pp) {
996 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
997 s->protocol);
998 continue;
999 }
1000 if (state >= pp->num_states) {
1001 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
1002 pp->name, state);
1003 continue;
1004 }
1005 } else {
1006 if (state >= IP_VS_CTPL_S_LAST)
1007 IP_VS_DBG(7, "BACKUP v0, Invalid tpl state %u\n",
1008 state);
1009 }
1010
1011 ip_vs_conn_fill_param(ipvs, AF_INET, s->protocol,
1012 (const union nf_inet_addr *)&s->caddr,
1013 s->cport,
1014 (const union nf_inet_addr *)&s->vaddr,
1015 s->vport, ¶m);
1016
1017 /* Send timeout as Zero */
1018 ip_vs_proc_conn(ipvs, ¶m, flags, state, s->protocol, AF_INET,
1019 (union nf_inet_addr *)&s->daddr, s->dport,
1020 0, 0, opt);
1021 }
1022 }
1023
1024 /*
1025 * Handle options
1026 */
ip_vs_proc_seqopt(__u8 * p,unsigned int plen,__u32 * opt_flags,struct ip_vs_sync_conn_options * opt)1027 static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen,
1028 __u32 *opt_flags,
1029 struct ip_vs_sync_conn_options *opt)
1030 {
1031 struct ip_vs_sync_conn_options *topt;
1032
1033 topt = (struct ip_vs_sync_conn_options *)p;
1034
1035 if (plen != sizeof(struct ip_vs_sync_conn_options)) {
1036 IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
1037 return -EINVAL;
1038 }
1039 if (*opt_flags & IPVS_OPT_F_SEQ_DATA) {
1040 IP_VS_DBG(2, "BACKUP, conn options found twice\n");
1041 return -EINVAL;
1042 }
1043 ntoh_seq(&topt->in_seq, &opt->in_seq);
1044 ntoh_seq(&topt->out_seq, &opt->out_seq);
1045 *opt_flags |= IPVS_OPT_F_SEQ_DATA;
1046 return 0;
1047 }
1048
ip_vs_proc_str(__u8 * p,unsigned int plen,unsigned int * data_len,__u8 ** data,unsigned int maxlen,__u32 * opt_flags,__u32 flag)1049 static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len,
1050 __u8 **data, unsigned int maxlen,
1051 __u32 *opt_flags, __u32 flag)
1052 {
1053 if (plen > maxlen) {
1054 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen);
1055 return -EINVAL;
1056 }
1057 if (*opt_flags & flag) {
1058 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag);
1059 return -EINVAL;
1060 }
1061 *data_len = plen;
1062 *data = p;
1063 *opt_flags |= flag;
1064 return 0;
1065 }
1066 /*
1067 * Process a Version 1 sync. connection
1068 */
ip_vs_proc_sync_conn(struct netns_ipvs * ipvs,__u8 * p,__u8 * msg_end)1069 static inline int ip_vs_proc_sync_conn(struct netns_ipvs *ipvs, __u8 *p, __u8 *msg_end)
1070 {
1071 struct ip_vs_sync_conn_options opt;
1072 union ip_vs_sync_conn *s;
1073 struct ip_vs_protocol *pp;
1074 struct ip_vs_conn_param param;
1075 __u32 flags;
1076 unsigned int af, state, pe_data_len=0, pe_name_len=0;
1077 __u8 *pe_data=NULL, *pe_name=NULL;
1078 __u32 opt_flags=0;
1079 int retc=0;
1080
1081 s = (union ip_vs_sync_conn *) p;
1082
1083 if (s->v6.type & STYPE_F_INET6) {
1084 #ifdef CONFIG_IP_VS_IPV6
1085 af = AF_INET6;
1086 p += sizeof(struct ip_vs_sync_v6);
1087 #else
1088 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
1089 retc = 10;
1090 goto out;
1091 #endif
1092 } else if (!s->v4.type) {
1093 af = AF_INET;
1094 p += sizeof(struct ip_vs_sync_v4);
1095 } else {
1096 return -10;
1097 }
1098 if (p > msg_end)
1099 return -20;
1100
1101 /* Process optional params check Type & Len. */
1102 while (p < msg_end) {
1103 int ptype;
1104 int plen;
1105
1106 if (p+2 > msg_end)
1107 return -30;
1108 ptype = *(p++);
1109 plen = *(p++);
1110
1111 if (!plen || ((p + plen) > msg_end))
1112 return -40;
1113 /* Handle seq option p = param data */
1114 switch (ptype & ~IPVS_OPT_F_PARAM) {
1115 case IPVS_OPT_SEQ_DATA:
1116 if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt))
1117 return -50;
1118 break;
1119
1120 case IPVS_OPT_PE_DATA:
1121 if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data,
1122 IP_VS_PEDATA_MAXLEN, &opt_flags,
1123 IPVS_OPT_F_PE_DATA))
1124 return -60;
1125 break;
1126
1127 case IPVS_OPT_PE_NAME:
1128 if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name,
1129 IP_VS_PENAME_MAXLEN, &opt_flags,
1130 IPVS_OPT_F_PE_NAME))
1131 return -70;
1132 break;
1133
1134 default:
1135 /* Param data mandatory ? */
1136 if (!(ptype & IPVS_OPT_F_PARAM)) {
1137 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
1138 ptype & ~IPVS_OPT_F_PARAM);
1139 retc = 20;
1140 goto out;
1141 }
1142 }
1143 p += plen; /* Next option */
1144 }
1145
1146 /* Get flags and Mask off unsupported */
1147 flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK;
1148 flags |= IP_VS_CONN_F_SYNC;
1149 state = ntohs(s->v4.state);
1150
1151 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
1152 pp = ip_vs_proto_get(s->v4.protocol);
1153 if (!pp) {
1154 IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
1155 s->v4.protocol);
1156 retc = 30;
1157 goto out;
1158 }
1159 if (state >= pp->num_states) {
1160 IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
1161 pp->name, state);
1162 retc = 40;
1163 goto out;
1164 }
1165 } else {
1166 if (state >= IP_VS_CTPL_S_LAST)
1167 IP_VS_DBG(7, "BACKUP, Invalid tpl state %u\n",
1168 state);
1169 }
1170 if (ip_vs_conn_fill_param_sync(ipvs, af, s, ¶m, pe_data,
1171 pe_data_len, pe_name, pe_name_len)) {
1172 retc = 50;
1173 goto out;
1174 }
1175 /* If only IPv4, just silent skip IPv6 */
1176 if (af == AF_INET)
1177 ip_vs_proc_conn(ipvs, ¶m, flags, state, s->v4.protocol, af,
1178 (union nf_inet_addr *)&s->v4.daddr, s->v4.dport,
1179 ntohl(s->v4.timeout), ntohl(s->v4.fwmark),
1180 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1181 );
1182 #ifdef CONFIG_IP_VS_IPV6
1183 else
1184 ip_vs_proc_conn(ipvs, ¶m, flags, state, s->v6.protocol, af,
1185 (union nf_inet_addr *)&s->v6.daddr, s->v6.dport,
1186 ntohl(s->v6.timeout), ntohl(s->v6.fwmark),
1187 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1188 );
1189 #endif
1190 ip_vs_pe_put(param.pe);
1191 return 0;
1192 /* Error exit */
1193 out:
1194 IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc);
1195 return retc;
1196
1197 }
1198 /*
1199 * Process received multicast message and create the corresponding
1200 * ip_vs_conn entries.
1201 * Handles Version 0 & 1
1202 */
ip_vs_process_message(struct netns_ipvs * ipvs,__u8 * buffer,const size_t buflen)1203 static void ip_vs_process_message(struct netns_ipvs *ipvs, __u8 *buffer,
1204 const size_t buflen)
1205 {
1206 struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer;
1207 __u8 *p, *msg_end;
1208 int i, nr_conns;
1209
1210 if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) {
1211 IP_VS_DBG(2, "BACKUP, message header too short\n");
1212 return;
1213 }
1214
1215 if (buflen != ntohs(m2->size)) {
1216 IP_VS_DBG(2, "BACKUP, bogus message size\n");
1217 return;
1218 }
1219 /* SyncID sanity check */
1220 if (ipvs->bcfg.syncid != 0 && m2->syncid != ipvs->bcfg.syncid) {
1221 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
1222 return;
1223 }
1224 /* Handle version 1 message */
1225 if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0)
1226 && (m2->spare == 0)) {
1227
1228 msg_end = buffer + sizeof(struct ip_vs_sync_mesg);
1229 nr_conns = m2->nr_conns;
1230
1231 for (i=0; i<nr_conns; i++) {
1232 union ip_vs_sync_conn *s;
1233 unsigned int size;
1234 int retc;
1235
1236 p = msg_end;
1237 if (p + sizeof(s->v4) > buffer+buflen) {
1238 IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n");
1239 return;
1240 }
1241 s = (union ip_vs_sync_conn *)p;
1242 size = ntohs(s->v4.ver_size) & SVER_MASK;
1243 msg_end = p + size;
1244 /* Basic sanity checks */
1245 if (msg_end > buffer+buflen) {
1246 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
1247 return;
1248 }
1249 if (ntohs(s->v4.ver_size) >> SVER_SHIFT) {
1250 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
1251 ntohs(s->v4.ver_size) >> SVER_SHIFT);
1252 return;
1253 }
1254 /* Process a single sync_conn */
1255 retc = ip_vs_proc_sync_conn(ipvs, p, msg_end);
1256 if (retc < 0) {
1257 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
1258 retc);
1259 return;
1260 }
1261 /* Make sure we have 32 bit alignment */
1262 msg_end = p + ((size + 3) & ~3);
1263 }
1264 } else {
1265 /* Old type of message */
1266 ip_vs_process_message_v0(ipvs, buffer, buflen);
1267 return;
1268 }
1269 }
1270
1271
1272 /*
1273 * Setup sndbuf (mode=1) or rcvbuf (mode=0)
1274 */
set_sock_size(struct sock * sk,int mode,int val)1275 static void set_sock_size(struct sock *sk, int mode, int val)
1276 {
1277 /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
1278 /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
1279 lock_sock(sk);
1280 if (mode) {
1281 val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2,
1282 sysctl_wmem_max);
1283 sk->sk_sndbuf = val * 2;
1284 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1285 } else {
1286 val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2,
1287 sysctl_rmem_max);
1288 sk->sk_rcvbuf = val * 2;
1289 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1290 }
1291 release_sock(sk);
1292 }
1293
1294 /*
1295 * Setup loopback of outgoing multicasts on a sending socket
1296 */
set_mcast_loop(struct sock * sk,u_char loop)1297 static void set_mcast_loop(struct sock *sk, u_char loop)
1298 {
1299 struct inet_sock *inet = inet_sk(sk);
1300
1301 /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
1302 lock_sock(sk);
1303 inet->mc_loop = loop ? 1 : 0;
1304 #ifdef CONFIG_IP_VS_IPV6
1305 if (sk->sk_family == AF_INET6) {
1306 struct ipv6_pinfo *np = inet6_sk(sk);
1307
1308 /* IPV6_MULTICAST_LOOP */
1309 np->mc_loop = loop ? 1 : 0;
1310 }
1311 #endif
1312 release_sock(sk);
1313 }
1314
1315 /*
1316 * Specify TTL for outgoing multicasts on a sending socket
1317 */
set_mcast_ttl(struct sock * sk,u_char ttl)1318 static void set_mcast_ttl(struct sock *sk, u_char ttl)
1319 {
1320 struct inet_sock *inet = inet_sk(sk);
1321
1322 /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
1323 lock_sock(sk);
1324 inet->mc_ttl = ttl;
1325 #ifdef CONFIG_IP_VS_IPV6
1326 if (sk->sk_family == AF_INET6) {
1327 struct ipv6_pinfo *np = inet6_sk(sk);
1328
1329 /* IPV6_MULTICAST_HOPS */
1330 np->mcast_hops = ttl;
1331 }
1332 #endif
1333 release_sock(sk);
1334 }
1335
1336 /* Control fragmentation of messages */
set_mcast_pmtudisc(struct sock * sk,int val)1337 static void set_mcast_pmtudisc(struct sock *sk, int val)
1338 {
1339 struct inet_sock *inet = inet_sk(sk);
1340
1341 /* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
1342 lock_sock(sk);
1343 inet->pmtudisc = val;
1344 #ifdef CONFIG_IP_VS_IPV6
1345 if (sk->sk_family == AF_INET6) {
1346 struct ipv6_pinfo *np = inet6_sk(sk);
1347
1348 /* IPV6_MTU_DISCOVER */
1349 np->pmtudisc = val;
1350 }
1351 #endif
1352 release_sock(sk);
1353 }
1354
1355 /*
1356 * Specifiy default interface for outgoing multicasts
1357 */
set_mcast_if(struct sock * sk,struct net_device * dev)1358 static int set_mcast_if(struct sock *sk, struct net_device *dev)
1359 {
1360 struct inet_sock *inet = inet_sk(sk);
1361
1362 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1363 return -EINVAL;
1364
1365 lock_sock(sk);
1366 inet->mc_index = dev->ifindex;
1367 /* inet->mc_addr = 0; */
1368 #ifdef CONFIG_IP_VS_IPV6
1369 if (sk->sk_family == AF_INET6) {
1370 struct ipv6_pinfo *np = inet6_sk(sk);
1371
1372 /* IPV6_MULTICAST_IF */
1373 np->mcast_oif = dev->ifindex;
1374 }
1375 #endif
1376 release_sock(sk);
1377
1378 return 0;
1379 }
1380
1381
1382 /*
1383 * Join a multicast group.
1384 * the group is specified by a class D multicast address 224.0.0.0/8
1385 * in the in_addr structure passed in as a parameter.
1386 */
1387 static int
join_mcast_group(struct sock * sk,struct in_addr * addr,struct net_device * dev)1388 join_mcast_group(struct sock *sk, struct in_addr *addr, struct net_device *dev)
1389 {
1390 struct ip_mreqn mreq;
1391 int ret;
1392
1393 memset(&mreq, 0, sizeof(mreq));
1394 memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
1395
1396 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1397 return -EINVAL;
1398
1399 mreq.imr_ifindex = dev->ifindex;
1400
1401 lock_sock(sk);
1402 ret = ip_mc_join_group(sk, &mreq);
1403 release_sock(sk);
1404
1405 return ret;
1406 }
1407
1408 #ifdef CONFIG_IP_VS_IPV6
join_mcast_group6(struct sock * sk,struct in6_addr * addr,struct net_device * dev)1409 static int join_mcast_group6(struct sock *sk, struct in6_addr *addr,
1410 struct net_device *dev)
1411 {
1412 int ret;
1413
1414 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1415 return -EINVAL;
1416
1417 lock_sock(sk);
1418 ret = ipv6_sock_mc_join(sk, dev->ifindex, addr);
1419 release_sock(sk);
1420
1421 return ret;
1422 }
1423 #endif
1424
bind_mcastif_addr(struct socket * sock,struct net_device * dev)1425 static int bind_mcastif_addr(struct socket *sock, struct net_device *dev)
1426 {
1427 __be32 addr;
1428 struct sockaddr_in sin;
1429
1430 addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
1431 if (!addr)
1432 pr_err("You probably need to specify IP address on "
1433 "multicast interface.\n");
1434
1435 IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
1436 dev->name, &addr);
1437
1438 /* Now bind the socket with the address of multicast interface */
1439 sin.sin_family = AF_INET;
1440 sin.sin_addr.s_addr = addr;
1441 sin.sin_port = 0;
1442
1443 return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
1444 }
1445
get_mcast_sockaddr(union ipvs_sockaddr * sa,int * salen,struct ipvs_sync_daemon_cfg * c,int id)1446 static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen,
1447 struct ipvs_sync_daemon_cfg *c, int id)
1448 {
1449 if (AF_INET6 == c->mcast_af) {
1450 sa->in6 = (struct sockaddr_in6) {
1451 .sin6_family = AF_INET6,
1452 .sin6_port = htons(c->mcast_port + id),
1453 };
1454 sa->in6.sin6_addr = c->mcast_group.in6;
1455 *salen = sizeof(sa->in6);
1456 } else {
1457 sa->in = (struct sockaddr_in) {
1458 .sin_family = AF_INET,
1459 .sin_port = htons(c->mcast_port + id),
1460 };
1461 sa->in.sin_addr = c->mcast_group.in;
1462 *salen = sizeof(sa->in);
1463 }
1464 }
1465
1466 /*
1467 * Set up sending multicast socket over UDP
1468 */
make_send_sock(struct netns_ipvs * ipvs,int id,struct net_device * dev,struct socket ** sock_ret)1469 static int make_send_sock(struct netns_ipvs *ipvs, int id,
1470 struct net_device *dev, struct socket **sock_ret)
1471 {
1472 /* multicast addr */
1473 union ipvs_sockaddr mcast_addr;
1474 struct socket *sock;
1475 int result, salen;
1476
1477 /* First create a socket */
1478 result = sock_create_kern(ipvs->net, ipvs->mcfg.mcast_af, SOCK_DGRAM,
1479 IPPROTO_UDP, &sock);
1480 if (result < 0) {
1481 pr_err("Error during creation of socket; terminating\n");
1482 goto error;
1483 }
1484 *sock_ret = sock;
1485 result = set_mcast_if(sock->sk, dev);
1486 if (result < 0) {
1487 pr_err("Error setting outbound mcast interface\n");
1488 goto error;
1489 }
1490
1491 set_mcast_loop(sock->sk, 0);
1492 set_mcast_ttl(sock->sk, ipvs->mcfg.mcast_ttl);
1493 /* Allow fragmentation if MTU changes */
1494 set_mcast_pmtudisc(sock->sk, IP_PMTUDISC_DONT);
1495 result = sysctl_sync_sock_size(ipvs);
1496 if (result > 0)
1497 set_sock_size(sock->sk, 1, result);
1498
1499 if (AF_INET == ipvs->mcfg.mcast_af)
1500 result = bind_mcastif_addr(sock, dev);
1501 else
1502 result = 0;
1503 if (result < 0) {
1504 pr_err("Error binding address of the mcast interface\n");
1505 goto error;
1506 }
1507
1508 get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->mcfg, id);
1509 result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
1510 salen, 0);
1511 if (result < 0) {
1512 pr_err("Error connecting to the multicast addr\n");
1513 goto error;
1514 }
1515
1516 return 0;
1517
1518 error:
1519 return result;
1520 }
1521
1522
1523 /*
1524 * Set up receiving multicast socket over UDP
1525 */
make_receive_sock(struct netns_ipvs * ipvs,int id,struct net_device * dev,struct socket ** sock_ret)1526 static int make_receive_sock(struct netns_ipvs *ipvs, int id,
1527 struct net_device *dev, struct socket **sock_ret)
1528 {
1529 /* multicast addr */
1530 union ipvs_sockaddr mcast_addr;
1531 struct socket *sock;
1532 int result, salen;
1533
1534 /* First create a socket */
1535 result = sock_create_kern(ipvs->net, ipvs->bcfg.mcast_af, SOCK_DGRAM,
1536 IPPROTO_UDP, &sock);
1537 if (result < 0) {
1538 pr_err("Error during creation of socket; terminating\n");
1539 goto error;
1540 }
1541 *sock_ret = sock;
1542 /* it is equivalent to the REUSEADDR option in user-space */
1543 sock->sk->sk_reuse = SK_CAN_REUSE;
1544 result = sysctl_sync_sock_size(ipvs);
1545 if (result > 0)
1546 set_sock_size(sock->sk, 0, result);
1547
1548 get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id);
1549 sock->sk->sk_bound_dev_if = dev->ifindex;
1550 result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen);
1551 if (result < 0) {
1552 pr_err("Error binding to the multicast addr\n");
1553 goto error;
1554 }
1555
1556 /* join the multicast group */
1557 #ifdef CONFIG_IP_VS_IPV6
1558 if (ipvs->bcfg.mcast_af == AF_INET6)
1559 result = join_mcast_group6(sock->sk, &mcast_addr.in6.sin6_addr,
1560 dev);
1561 else
1562 #endif
1563 result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr,
1564 dev);
1565 if (result < 0) {
1566 pr_err("Error joining to the multicast group\n");
1567 goto error;
1568 }
1569
1570 return 0;
1571
1572 error:
1573 return result;
1574 }
1575
1576
1577 static int
ip_vs_send_async(struct socket * sock,const char * buffer,const size_t length)1578 ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
1579 {
1580 struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL};
1581 struct kvec iov;
1582 int len;
1583
1584 EnterFunction(7);
1585 iov.iov_base = (void *)buffer;
1586 iov.iov_len = length;
1587
1588 len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
1589
1590 LeaveFunction(7);
1591 return len;
1592 }
1593
1594 static int
ip_vs_send_sync_msg(struct socket * sock,struct ip_vs_sync_mesg * msg)1595 ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
1596 {
1597 int msize;
1598 int ret;
1599
1600 msize = ntohs(msg->size);
1601
1602 ret = ip_vs_send_async(sock, (char *)msg, msize);
1603 if (ret >= 0 || ret == -EAGAIN)
1604 return ret;
1605 pr_err("ip_vs_send_async error %d\n", ret);
1606 return 0;
1607 }
1608
1609 static int
ip_vs_receive(struct socket * sock,char * buffer,const size_t buflen)1610 ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
1611 {
1612 struct msghdr msg = {NULL,};
1613 struct kvec iov = {buffer, buflen};
1614 int len;
1615
1616 EnterFunction(7);
1617
1618 /* Receive a packet */
1619 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, buflen);
1620 len = sock_recvmsg(sock, &msg, MSG_DONTWAIT);
1621 if (len < 0)
1622 return len;
1623
1624 LeaveFunction(7);
1625 return len;
1626 }
1627
1628 /* Wakeup the master thread for sending */
master_wakeup_work_handler(struct work_struct * work)1629 static void master_wakeup_work_handler(struct work_struct *work)
1630 {
1631 struct ipvs_master_sync_state *ms =
1632 container_of(work, struct ipvs_master_sync_state,
1633 master_wakeup_work.work);
1634 struct netns_ipvs *ipvs = ms->ipvs;
1635
1636 spin_lock_bh(&ipvs->sync_lock);
1637 if (ms->sync_queue_len &&
1638 ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) {
1639 ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE;
1640 wake_up_process(ms->master_thread);
1641 }
1642 spin_unlock_bh(&ipvs->sync_lock);
1643 }
1644
1645 /* Get next buffer to send */
1646 static inline struct ip_vs_sync_buff *
next_sync_buff(struct netns_ipvs * ipvs,struct ipvs_master_sync_state * ms)1647 next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
1648 {
1649 struct ip_vs_sync_buff *sb;
1650
1651 sb = sb_dequeue(ipvs, ms);
1652 if (sb)
1653 return sb;
1654 /* Do not delay entries in buffer for more than 2 seconds */
1655 return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME);
1656 }
1657
sync_thread_master(void * data)1658 static int sync_thread_master(void *data)
1659 {
1660 struct ip_vs_sync_thread_data *tinfo = data;
1661 struct netns_ipvs *ipvs = tinfo->ipvs;
1662 struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id];
1663 struct sock *sk = tinfo->sock->sk;
1664 struct ip_vs_sync_buff *sb;
1665
1666 pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
1667 "syncid = %d, id = %d\n",
1668 ipvs->mcfg.mcast_ifn, ipvs->mcfg.syncid, tinfo->id);
1669
1670 for (;;) {
1671 sb = next_sync_buff(ipvs, ms);
1672 if (unlikely(kthread_should_stop()))
1673 break;
1674 if (!sb) {
1675 schedule_timeout(IPVS_SYNC_CHECK_PERIOD);
1676 continue;
1677 }
1678 while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
1679 /* (Ab)use interruptible sleep to avoid increasing
1680 * the load avg.
1681 */
1682 __wait_event_interruptible(*sk_sleep(sk),
1683 sock_writeable(sk) ||
1684 kthread_should_stop());
1685 if (unlikely(kthread_should_stop()))
1686 goto done;
1687 }
1688 ip_vs_sync_buff_release(sb);
1689 }
1690
1691 done:
1692 __set_current_state(TASK_RUNNING);
1693 if (sb)
1694 ip_vs_sync_buff_release(sb);
1695
1696 /* clean up the sync_buff queue */
1697 while ((sb = sb_dequeue(ipvs, ms)))
1698 ip_vs_sync_buff_release(sb);
1699 __set_current_state(TASK_RUNNING);
1700
1701 /* clean up the current sync_buff */
1702 sb = get_curr_sync_buff(ipvs, ms, 0);
1703 if (sb)
1704 ip_vs_sync_buff_release(sb);
1705
1706 /* release the sending multicast socket */
1707 sock_release(tinfo->sock);
1708 kfree(tinfo);
1709
1710 return 0;
1711 }
1712
1713
sync_thread_backup(void * data)1714 static int sync_thread_backup(void *data)
1715 {
1716 struct ip_vs_sync_thread_data *tinfo = data;
1717 struct netns_ipvs *ipvs = tinfo->ipvs;
1718 int len;
1719
1720 pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
1721 "syncid = %d, id = %d\n",
1722 ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
1723
1724 while (!kthread_should_stop()) {
1725 wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
1726 !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
1727 || kthread_should_stop());
1728
1729 /* do we have data now? */
1730 while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
1731 len = ip_vs_receive(tinfo->sock, tinfo->buf,
1732 ipvs->bcfg.sync_maxlen);
1733 if (len <= 0) {
1734 if (len != -EAGAIN)
1735 pr_err("receiving message error\n");
1736 break;
1737 }
1738
1739 ip_vs_process_message(ipvs, tinfo->buf, len);
1740 }
1741 }
1742
1743 /* release the sending multicast socket */
1744 sock_release(tinfo->sock);
1745 kfree(tinfo->buf);
1746 kfree(tinfo);
1747
1748 return 0;
1749 }
1750
1751
start_sync_thread(struct netns_ipvs * ipvs,struct ipvs_sync_daemon_cfg * c,int state)1752 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c,
1753 int state)
1754 {
1755 struct ip_vs_sync_thread_data *tinfo = NULL;
1756 struct task_struct **array = NULL, *task;
1757 struct net_device *dev;
1758 char *name;
1759 int (*threadfn)(void *data);
1760 int id = 0, count, hlen;
1761 int result = -ENOMEM;
1762 u16 mtu, min_mtu;
1763
1764 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1765 IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %zd bytes\n",
1766 sizeof(struct ip_vs_sync_conn_v0));
1767
1768 /* Do not hold one mutex and then to block on another */
1769 for (;;) {
1770 rtnl_lock();
1771 if (mutex_trylock(&ipvs->sync_mutex))
1772 break;
1773 rtnl_unlock();
1774 mutex_lock(&ipvs->sync_mutex);
1775 if (rtnl_trylock())
1776 break;
1777 mutex_unlock(&ipvs->sync_mutex);
1778 }
1779
1780 if (!ipvs->sync_state) {
1781 count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX);
1782 ipvs->threads_mask = count - 1;
1783 } else
1784 count = ipvs->threads_mask + 1;
1785
1786 if (c->mcast_af == AF_UNSPEC) {
1787 c->mcast_af = AF_INET;
1788 c->mcast_group.ip = cpu_to_be32(IP_VS_SYNC_GROUP);
1789 }
1790 if (!c->mcast_port)
1791 c->mcast_port = IP_VS_SYNC_PORT;
1792 if (!c->mcast_ttl)
1793 c->mcast_ttl = 1;
1794
1795 dev = __dev_get_by_name(ipvs->net, c->mcast_ifn);
1796 if (!dev) {
1797 pr_err("Unknown mcast interface: %s\n", c->mcast_ifn);
1798 result = -ENODEV;
1799 goto out_early;
1800 }
1801 hlen = (AF_INET6 == c->mcast_af) ?
1802 sizeof(struct ipv6hdr) + sizeof(struct udphdr) :
1803 sizeof(struct iphdr) + sizeof(struct udphdr);
1804 mtu = (state == IP_VS_STATE_BACKUP) ?
1805 clamp(dev->mtu, 1500U, 65535U) : 1500U;
1806 min_mtu = (state == IP_VS_STATE_BACKUP) ? 1024 : 1;
1807
1808 if (c->sync_maxlen)
1809 c->sync_maxlen = clamp_t(unsigned int,
1810 c->sync_maxlen, min_mtu,
1811 65535 - hlen);
1812 else
1813 c->sync_maxlen = mtu - hlen;
1814
1815 if (state == IP_VS_STATE_MASTER) {
1816 result = -EEXIST;
1817 if (ipvs->ms)
1818 goto out_early;
1819
1820 ipvs->mcfg = *c;
1821 name = "ipvs-m:%d:%d";
1822 threadfn = sync_thread_master;
1823 } else if (state == IP_VS_STATE_BACKUP) {
1824 result = -EEXIST;
1825 if (ipvs->backup_threads)
1826 goto out_early;
1827
1828 ipvs->bcfg = *c;
1829 name = "ipvs-b:%d:%d";
1830 threadfn = sync_thread_backup;
1831 } else {
1832 result = -EINVAL;
1833 goto out_early;
1834 }
1835
1836 if (state == IP_VS_STATE_MASTER) {
1837 struct ipvs_master_sync_state *ms;
1838
1839 result = -ENOMEM;
1840 ipvs->ms = kcalloc(count, sizeof(ipvs->ms[0]), GFP_KERNEL);
1841 if (!ipvs->ms)
1842 goto out;
1843 ms = ipvs->ms;
1844 for (id = 0; id < count; id++, ms++) {
1845 INIT_LIST_HEAD(&ms->sync_queue);
1846 ms->sync_queue_len = 0;
1847 ms->sync_queue_delay = 0;
1848 INIT_DELAYED_WORK(&ms->master_wakeup_work,
1849 master_wakeup_work_handler);
1850 ms->ipvs = ipvs;
1851 }
1852 } else {
1853 array = kcalloc(count, sizeof(struct task_struct *),
1854 GFP_KERNEL);
1855 result = -ENOMEM;
1856 if (!array)
1857 goto out;
1858 }
1859
1860 for (id = 0; id < count; id++) {
1861 result = -ENOMEM;
1862 tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
1863 if (!tinfo)
1864 goto out;
1865 tinfo->ipvs = ipvs;
1866 tinfo->sock = NULL;
1867 if (state == IP_VS_STATE_BACKUP) {
1868 tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen,
1869 GFP_KERNEL);
1870 if (!tinfo->buf)
1871 goto out;
1872 } else {
1873 tinfo->buf = NULL;
1874 }
1875 tinfo->id = id;
1876 if (state == IP_VS_STATE_MASTER)
1877 result = make_send_sock(ipvs, id, dev, &tinfo->sock);
1878 else
1879 result = make_receive_sock(ipvs, id, dev, &tinfo->sock);
1880 if (result < 0)
1881 goto out;
1882
1883 task = kthread_run(threadfn, tinfo, name, ipvs->gen, id);
1884 if (IS_ERR(task)) {
1885 result = PTR_ERR(task);
1886 goto out;
1887 }
1888 tinfo = NULL;
1889 if (state == IP_VS_STATE_MASTER)
1890 ipvs->ms[id].master_thread = task;
1891 else
1892 array[id] = task;
1893 }
1894
1895 /* mark as active */
1896
1897 if (state == IP_VS_STATE_BACKUP)
1898 ipvs->backup_threads = array;
1899 spin_lock_bh(&ipvs->sync_buff_lock);
1900 ipvs->sync_state |= state;
1901 spin_unlock_bh(&ipvs->sync_buff_lock);
1902
1903 mutex_unlock(&ipvs->sync_mutex);
1904 rtnl_unlock();
1905
1906 /* increase the module use count */
1907 ip_vs_use_count_inc();
1908
1909 return 0;
1910
1911 out:
1912 /* We do not need RTNL lock anymore, release it here so that
1913 * sock_release below and in the kthreads can use rtnl_lock
1914 * to leave the mcast group.
1915 */
1916 rtnl_unlock();
1917 count = id;
1918 while (count-- > 0) {
1919 if (state == IP_VS_STATE_MASTER)
1920 kthread_stop(ipvs->ms[count].master_thread);
1921 else
1922 kthread_stop(array[count]);
1923 }
1924 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
1925 kfree(ipvs->ms);
1926 ipvs->ms = NULL;
1927 }
1928 mutex_unlock(&ipvs->sync_mutex);
1929 if (tinfo) {
1930 if (tinfo->sock)
1931 sock_release(tinfo->sock);
1932 kfree(tinfo->buf);
1933 kfree(tinfo);
1934 }
1935 kfree(array);
1936 return result;
1937
1938 out_early:
1939 mutex_unlock(&ipvs->sync_mutex);
1940 rtnl_unlock();
1941 return result;
1942 }
1943
1944
stop_sync_thread(struct netns_ipvs * ipvs,int state)1945 int stop_sync_thread(struct netns_ipvs *ipvs, int state)
1946 {
1947 struct task_struct **array;
1948 int id;
1949 int retc = -EINVAL;
1950
1951 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1952
1953 if (state == IP_VS_STATE_MASTER) {
1954 if (!ipvs->ms)
1955 return -ESRCH;
1956
1957 /*
1958 * The lock synchronizes with sb_queue_tail(), so that we don't
1959 * add sync buffers to the queue, when we are already in
1960 * progress of stopping the master sync daemon.
1961 */
1962
1963 spin_lock_bh(&ipvs->sync_buff_lock);
1964 spin_lock(&ipvs->sync_lock);
1965 ipvs->sync_state &= ~IP_VS_STATE_MASTER;
1966 spin_unlock(&ipvs->sync_lock);
1967 spin_unlock_bh(&ipvs->sync_buff_lock);
1968
1969 retc = 0;
1970 for (id = ipvs->threads_mask; id >= 0; id--) {
1971 struct ipvs_master_sync_state *ms = &ipvs->ms[id];
1972 int ret;
1973
1974 pr_info("stopping master sync thread %d ...\n",
1975 task_pid_nr(ms->master_thread));
1976 cancel_delayed_work_sync(&ms->master_wakeup_work);
1977 ret = kthread_stop(ms->master_thread);
1978 if (retc >= 0)
1979 retc = ret;
1980 }
1981 kfree(ipvs->ms);
1982 ipvs->ms = NULL;
1983 } else if (state == IP_VS_STATE_BACKUP) {
1984 if (!ipvs->backup_threads)
1985 return -ESRCH;
1986
1987 ipvs->sync_state &= ~IP_VS_STATE_BACKUP;
1988 array = ipvs->backup_threads;
1989 retc = 0;
1990 for (id = ipvs->threads_mask; id >= 0; id--) {
1991 int ret;
1992
1993 pr_info("stopping backup sync thread %d ...\n",
1994 task_pid_nr(array[id]));
1995 ret = kthread_stop(array[id]);
1996 if (retc >= 0)
1997 retc = ret;
1998 }
1999 kfree(array);
2000 ipvs->backup_threads = NULL;
2001 }
2002
2003 /* decrease the module use count */
2004 ip_vs_use_count_dec();
2005
2006 return retc;
2007 }
2008
2009 /*
2010 * Initialize data struct for each netns
2011 */
ip_vs_sync_net_init(struct netns_ipvs * ipvs)2012 int __net_init ip_vs_sync_net_init(struct netns_ipvs *ipvs)
2013 {
2014 __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key);
2015 spin_lock_init(&ipvs->sync_lock);
2016 spin_lock_init(&ipvs->sync_buff_lock);
2017 return 0;
2018 }
2019
ip_vs_sync_net_cleanup(struct netns_ipvs * ipvs)2020 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs)
2021 {
2022 int retc;
2023
2024 mutex_lock(&ipvs->sync_mutex);
2025 retc = stop_sync_thread(ipvs, IP_VS_STATE_MASTER);
2026 if (retc && retc != -ESRCH)
2027 pr_err("Failed to stop Master Daemon\n");
2028
2029 retc = stop_sync_thread(ipvs, IP_VS_STATE_BACKUP);
2030 if (retc && retc != -ESRCH)
2031 pr_err("Failed to stop Backup Daemon\n");
2032 mutex_unlock(&ipvs->sync_mutex);
2033 }
2034
