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 task_struct *task;
199 struct netns_ipvs *ipvs;
200 struct socket *sock;
201 char *buf;
202 int id;
203 };
204
205 /* Version 0 definition of packet sizes */
206 #define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0))
207 #define FULL_CONN_SIZE \
208 (sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options))
209
210
211 /*
212 The master mulitcasts messages (Datagrams) to the backup load balancers
213 in the following format.
214
215 Version 1:
216 Note, first byte should be Zero, so ver 0 receivers will drop the packet.
217
218 0 1 2 3
219 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
220 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
221 | 0 | SyncID | Size |
222 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
223 | Count Conns | Version | Reserved, set to Zero |
224 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
225 | |
226 | IPVS Sync Connection (1) |
227 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
228 | . |
229 ~ . ~
230 | . |
231 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
232 | |
233 | IPVS Sync Connection (n) |
234 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
235
236 Version 0 Header
237 0 1 2 3
238 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
239 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
240 | Count Conns | SyncID | Size |
241 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
242 | IPVS Sync Connection (1) |
243 */
244
245 /* Version 0 header */
246 struct ip_vs_sync_mesg_v0 {
247 __u8 nr_conns;
248 __u8 syncid;
249 __be16 size;
250
251 /* ip_vs_sync_conn entries start here */
252 };
253
254 /* Version 1 header */
255 struct ip_vs_sync_mesg {
256 __u8 reserved; /* must be zero */
257 __u8 syncid;
258 __be16 size;
259 __u8 nr_conns;
260 __s8 version; /* SYNC_PROTO_VER */
261 __u16 spare;
262 /* ip_vs_sync_conn entries start here */
263 };
264
265 union ipvs_sockaddr {
266 struct sockaddr_in in;
267 struct sockaddr_in6 in6;
268 };
269
270 struct ip_vs_sync_buff {
271 struct list_head list;
272 unsigned long firstuse;
273
274 /* pointers for the message data */
275 struct ip_vs_sync_mesg *mesg;
276 unsigned char *head;
277 unsigned char *end;
278 };
279
280 /*
281 * Copy of struct ip_vs_seq
282 * From unaligned network order to aligned host order
283 */
ntoh_seq(struct ip_vs_seq * no,struct ip_vs_seq * ho)284 static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho)
285 {
286 memset(ho, 0, sizeof(*ho));
287 ho->init_seq = get_unaligned_be32(&no->init_seq);
288 ho->delta = get_unaligned_be32(&no->delta);
289 ho->previous_delta = get_unaligned_be32(&no->previous_delta);
290 }
291
292 /*
293 * Copy of struct ip_vs_seq
294 * From Aligned host order to unaligned network order
295 */
hton_seq(struct ip_vs_seq * ho,struct ip_vs_seq * no)296 static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no)
297 {
298 put_unaligned_be32(ho->init_seq, &no->init_seq);
299 put_unaligned_be32(ho->delta, &no->delta);
300 put_unaligned_be32(ho->previous_delta, &no->previous_delta);
301 }
302
303 static inline struct ip_vs_sync_buff *
sb_dequeue(struct netns_ipvs * ipvs,struct ipvs_master_sync_state * ms)304 sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
305 {
306 struct ip_vs_sync_buff *sb;
307
308 spin_lock_bh(&ipvs->sync_lock);
309 if (list_empty(&ms->sync_queue)) {
310 sb = NULL;
311 __set_current_state(TASK_INTERRUPTIBLE);
312 } else {
313 sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff,
314 list);
315 list_del(&sb->list);
316 ms->sync_queue_len--;
317 if (!ms->sync_queue_len)
318 ms->sync_queue_delay = 0;
319 }
320 spin_unlock_bh(&ipvs->sync_lock);
321
322 return sb;
323 }
324
325 /*
326 * Create a new sync buffer for Version 1 proto.
327 */
328 static inline struct ip_vs_sync_buff *
ip_vs_sync_buff_create(struct netns_ipvs * ipvs,unsigned int len)329 ip_vs_sync_buff_create(struct netns_ipvs *ipvs, unsigned int len)
330 {
331 struct ip_vs_sync_buff *sb;
332
333 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
334 return NULL;
335
336 len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),
337 ipvs->mcfg.sync_maxlen);
338 sb->mesg = kmalloc(len, GFP_ATOMIC);
339 if (!sb->mesg) {
340 kfree(sb);
341 return NULL;
342 }
343 sb->mesg->reserved = 0; /* old nr_conns i.e. must be zero now */
344 sb->mesg->version = SYNC_PROTO_VER;
345 sb->mesg->syncid = ipvs->mcfg.syncid;
346 sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
347 sb->mesg->nr_conns = 0;
348 sb->mesg->spare = 0;
349 sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
350 sb->end = (unsigned char *)sb->mesg + len;
351
352 sb->firstuse = jiffies;
353 return sb;
354 }
355
ip_vs_sync_buff_release(struct ip_vs_sync_buff * sb)356 static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
357 {
358 kfree(sb->mesg);
359 kfree(sb);
360 }
361
sb_queue_tail(struct netns_ipvs * ipvs,struct ipvs_master_sync_state * ms)362 static inline void sb_queue_tail(struct netns_ipvs *ipvs,
363 struct ipvs_master_sync_state *ms)
364 {
365 struct ip_vs_sync_buff *sb = ms->sync_buff;
366
367 spin_lock(&ipvs->sync_lock);
368 if (ipvs->sync_state & IP_VS_STATE_MASTER &&
369 ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) {
370 if (!ms->sync_queue_len)
371 schedule_delayed_work(&ms->master_wakeup_work,
372 max(IPVS_SYNC_SEND_DELAY, 1));
373 ms->sync_queue_len++;
374 list_add_tail(&sb->list, &ms->sync_queue);
375 if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE) {
376 int id = (int)(ms - ipvs->ms);
377
378 wake_up_process(ipvs->master_tinfo[id].task);
379 }
380 } else
381 ip_vs_sync_buff_release(sb);
382 spin_unlock(&ipvs->sync_lock);
383 }
384
385 /*
386 * Get the current sync buffer if it has been created for more
387 * than the specified time or the specified time is zero.
388 */
389 static inline struct ip_vs_sync_buff *
get_curr_sync_buff(struct netns_ipvs * ipvs,struct ipvs_master_sync_state * ms,unsigned long time)390 get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms,
391 unsigned long time)
392 {
393 struct ip_vs_sync_buff *sb;
394
395 spin_lock_bh(&ipvs->sync_buff_lock);
396 sb = ms->sync_buff;
397 if (sb && time_after_eq(jiffies - sb->firstuse, time)) {
398 ms->sync_buff = NULL;
399 __set_current_state(TASK_RUNNING);
400 } else
401 sb = NULL;
402 spin_unlock_bh(&ipvs->sync_buff_lock);
403 return sb;
404 }
405
406 static inline int
select_master_thread_id(struct netns_ipvs * ipvs,struct ip_vs_conn * cp)407 select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
408 {
409 return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask;
410 }
411
412 /*
413 * Create a new sync buffer for Version 0 proto.
414 */
415 static inline struct ip_vs_sync_buff *
ip_vs_sync_buff_create_v0(struct netns_ipvs * ipvs,unsigned int len)416 ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs, unsigned int len)
417 {
418 struct ip_vs_sync_buff *sb;
419 struct ip_vs_sync_mesg_v0 *mesg;
420
421 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
422 return NULL;
423
424 len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),
425 ipvs->mcfg.sync_maxlen);
426 sb->mesg = kmalloc(len, GFP_ATOMIC);
427 if (!sb->mesg) {
428 kfree(sb);
429 return NULL;
430 }
431 mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
432 mesg->nr_conns = 0;
433 mesg->syncid = ipvs->mcfg.syncid;
434 mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
435 sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
436 sb->end = (unsigned char *)mesg + len;
437 sb->firstuse = jiffies;
438 return sb;
439 }
440
441 /* Check if connection is controlled by persistence */
in_persistence(struct ip_vs_conn * cp)442 static inline bool in_persistence(struct ip_vs_conn *cp)
443 {
444 for (cp = cp->control; cp; cp = cp->control) {
445 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
446 return true;
447 }
448 return false;
449 }
450
451 /* Check if conn should be synced.
452 * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
453 * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
454 * sync_retries times with period of sync_refresh_period/8
455 * - (2) if both sync_refresh_period and sync_period are 0 send sync only
456 * for state changes or only once when pkts matches sync_threshold
457 * - (3) templates: rate can be reduced only with sync_refresh_period or
458 * with (2)
459 */
ip_vs_sync_conn_needed(struct netns_ipvs * ipvs,struct ip_vs_conn * cp,int pkts)460 static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
461 struct ip_vs_conn *cp, int pkts)
462 {
463 unsigned long orig = READ_ONCE(cp->sync_endtime);
464 unsigned long now = jiffies;
465 unsigned long n = (now + cp->timeout) & ~3UL;
466 unsigned int sync_refresh_period;
467 int sync_period;
468 int force;
469
470 /* Check if we sync in current state */
471 if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
472 force = 0;
473 else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp)))
474 return 0;
475 else if (likely(cp->protocol == IPPROTO_TCP)) {
476 if (!((1 << cp->state) &
477 ((1 << IP_VS_TCP_S_ESTABLISHED) |
478 (1 << IP_VS_TCP_S_FIN_WAIT) |
479 (1 << IP_VS_TCP_S_CLOSE) |
480 (1 << IP_VS_TCP_S_CLOSE_WAIT) |
481 (1 << IP_VS_TCP_S_TIME_WAIT))))
482 return 0;
483 force = cp->state != cp->old_state;
484 if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
485 goto set;
486 } else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
487 if (!((1 << cp->state) &
488 ((1 << IP_VS_SCTP_S_ESTABLISHED) |
489 (1 << IP_VS_SCTP_S_SHUTDOWN_SENT) |
490 (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) |
491 (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) |
492 (1 << IP_VS_SCTP_S_CLOSED))))
493 return 0;
494 force = cp->state != cp->old_state;
495 if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
496 goto set;
497 } else {
498 /* UDP or another protocol with single state */
499 force = 0;
500 }
501
502 sync_refresh_period = sysctl_sync_refresh_period(ipvs);
503 if (sync_refresh_period > 0) {
504 long diff = n - orig;
505 long min_diff = max(cp->timeout >> 1, 10UL * HZ);
506
507 /* Avoid sync if difference is below sync_refresh_period
508 * and below the half timeout.
509 */
510 if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
511 int retries = orig & 3;
512
513 if (retries >= sysctl_sync_retries(ipvs))
514 return 0;
515 if (time_before(now, orig - cp->timeout +
516 (sync_refresh_period >> 3)))
517 return 0;
518 n |= retries + 1;
519 }
520 }
521 sync_period = sysctl_sync_period(ipvs);
522 if (sync_period > 0) {
523 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
524 pkts % sync_period != sysctl_sync_threshold(ipvs))
525 return 0;
526 } else if (!sync_refresh_period &&
527 pkts != sysctl_sync_threshold(ipvs))
528 return 0;
529
530 set:
531 cp->old_state = cp->state;
532 n = cmpxchg(&cp->sync_endtime, orig, n);
533 return n == orig || force;
534 }
535
536 /*
537 * Version 0 , could be switched in by sys_ctl.
538 * Add an ip_vs_conn information into the current sync_buff.
539 */
ip_vs_sync_conn_v0(struct netns_ipvs * ipvs,struct ip_vs_conn * cp,int pkts)540 static void ip_vs_sync_conn_v0(struct netns_ipvs *ipvs, struct ip_vs_conn *cp,
541 int pkts)
542 {
543 struct ip_vs_sync_mesg_v0 *m;
544 struct ip_vs_sync_conn_v0 *s;
545 struct ip_vs_sync_buff *buff;
546 struct ipvs_master_sync_state *ms;
547 int id;
548 unsigned int len;
549
550 if (unlikely(cp->af != AF_INET))
551 return;
552 /* Do not sync ONE PACKET */
553 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
554 return;
555
556 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
557 return;
558
559 spin_lock_bh(&ipvs->sync_buff_lock);
560 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
561 spin_unlock_bh(&ipvs->sync_buff_lock);
562 return;
563 }
564
565 id = select_master_thread_id(ipvs, cp);
566 ms = &ipvs->ms[id];
567 buff = ms->sync_buff;
568 len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
569 SIMPLE_CONN_SIZE;
570 if (buff) {
571 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
572 /* Send buffer if it is for v1 */
573 if (buff->head + len > buff->end || !m->nr_conns) {
574 sb_queue_tail(ipvs, ms);
575 ms->sync_buff = NULL;
576 buff = NULL;
577 }
578 }
579 if (!buff) {
580 buff = ip_vs_sync_buff_create_v0(ipvs, len);
581 if (!buff) {
582 spin_unlock_bh(&ipvs->sync_buff_lock);
583 pr_err("ip_vs_sync_buff_create failed.\n");
584 return;
585 }
586 ms->sync_buff = buff;
587 }
588
589 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
590 s = (struct ip_vs_sync_conn_v0 *) buff->head;
591
592 /* copy members */
593 s->reserved = 0;
594 s->protocol = cp->protocol;
595 s->cport = cp->cport;
596 s->vport = cp->vport;
597 s->dport = cp->dport;
598 s->caddr = cp->caddr.ip;
599 s->vaddr = cp->vaddr.ip;
600 s->daddr = cp->daddr.ip;
601 s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
602 s->state = htons(cp->state);
603 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
604 struct ip_vs_sync_conn_options *opt =
605 (struct ip_vs_sync_conn_options *)&s[1];
606 memcpy(opt, &cp->in_seq, sizeof(*opt));
607 }
608
609 m->nr_conns++;
610 m->size = htons(ntohs(m->size) + len);
611 buff->head += len;
612 spin_unlock_bh(&ipvs->sync_buff_lock);
613
614 /* synchronize its controller if it has */
615 cp = cp->control;
616 if (cp) {
617 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
618 pkts = atomic_inc_return(&cp->in_pkts);
619 else
620 pkts = sysctl_sync_threshold(ipvs);
621 ip_vs_sync_conn(ipvs, cp, pkts);
622 }
623 }
624
625 /*
626 * Add an ip_vs_conn information into the current sync_buff.
627 * Called by ip_vs_in.
628 * Sending Version 1 messages
629 */
ip_vs_sync_conn(struct netns_ipvs * ipvs,struct ip_vs_conn * cp,int pkts)630 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts)
631 {
632 struct ip_vs_sync_mesg *m;
633 union ip_vs_sync_conn *s;
634 struct ip_vs_sync_buff *buff;
635 struct ipvs_master_sync_state *ms;
636 int id;
637 __u8 *p;
638 unsigned int len, pe_name_len, pad;
639
640 /* Handle old version of the protocol */
641 if (sysctl_sync_ver(ipvs) == 0) {
642 ip_vs_sync_conn_v0(ipvs, cp, pkts);
643 return;
644 }
645 /* Do not sync ONE PACKET */
646 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
647 goto control;
648 sloop:
649 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
650 goto control;
651
652 /* Sanity checks */
653 pe_name_len = 0;
654 if (cp->pe_data_len) {
655 if (!cp->pe_data || !cp->dest) {
656 IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
657 return;
658 }
659 pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN);
660 }
661
662 spin_lock_bh(&ipvs->sync_buff_lock);
663 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
664 spin_unlock_bh(&ipvs->sync_buff_lock);
665 return;
666 }
667
668 id = select_master_thread_id(ipvs, cp);
669 ms = &ipvs->ms[id];
670
671 #ifdef CONFIG_IP_VS_IPV6
672 if (cp->af == AF_INET6)
673 len = sizeof(struct ip_vs_sync_v6);
674 else
675 #endif
676 len = sizeof(struct ip_vs_sync_v4);
677
678 if (cp->flags & IP_VS_CONN_F_SEQ_MASK)
679 len += sizeof(struct ip_vs_sync_conn_options) + 2;
680
681 if (cp->pe_data_len)
682 len += cp->pe_data_len + 2; /* + Param hdr field */
683 if (pe_name_len)
684 len += pe_name_len + 2;
685
686 /* check if there is a space for this one */
687 pad = 0;
688 buff = ms->sync_buff;
689 if (buff) {
690 m = buff->mesg;
691 pad = (4 - (size_t) buff->head) & 3;
692 /* Send buffer if it is for v0 */
693 if (buff->head + len + pad > buff->end || m->reserved) {
694 sb_queue_tail(ipvs, ms);
695 ms->sync_buff = NULL;
696 buff = NULL;
697 pad = 0;
698 }
699 }
700
701 if (!buff) {
702 buff = ip_vs_sync_buff_create(ipvs, len);
703 if (!buff) {
704 spin_unlock_bh(&ipvs->sync_buff_lock);
705 pr_err("ip_vs_sync_buff_create failed.\n");
706 return;
707 }
708 ms->sync_buff = buff;
709 m = buff->mesg;
710 }
711
712 p = buff->head;
713 buff->head += pad + len;
714 m->size = htons(ntohs(m->size) + pad + len);
715 /* Add ev. padding from prev. sync_conn */
716 while (pad--)
717 *(p++) = 0;
718
719 s = (union ip_vs_sync_conn *)p;
720
721 /* Set message type & copy members */
722 s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0);
723 s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */
724 s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED);
725 s->v4.state = htons(cp->state);
726 s->v4.protocol = cp->protocol;
727 s->v4.cport = cp->cport;
728 s->v4.vport = cp->vport;
729 s->v4.dport = cp->dport;
730 s->v4.fwmark = htonl(cp->fwmark);
731 s->v4.timeout = htonl(cp->timeout / HZ);
732 m->nr_conns++;
733
734 #ifdef CONFIG_IP_VS_IPV6
735 if (cp->af == AF_INET6) {
736 p += sizeof(struct ip_vs_sync_v6);
737 s->v6.caddr = cp->caddr.in6;
738 s->v6.vaddr = cp->vaddr.in6;
739 s->v6.daddr = cp->daddr.in6;
740 } else
741 #endif
742 {
743 p += sizeof(struct ip_vs_sync_v4); /* options ptr */
744 s->v4.caddr = cp->caddr.ip;
745 s->v4.vaddr = cp->vaddr.ip;
746 s->v4.daddr = cp->daddr.ip;
747 }
748 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
749 *(p++) = IPVS_OPT_SEQ_DATA;
750 *(p++) = sizeof(struct ip_vs_sync_conn_options);
751 hton_seq((struct ip_vs_seq *)p, &cp->in_seq);
752 p += sizeof(struct ip_vs_seq);
753 hton_seq((struct ip_vs_seq *)p, &cp->out_seq);
754 p += sizeof(struct ip_vs_seq);
755 }
756 /* Handle pe data */
757 if (cp->pe_data_len && cp->pe_data) {
758 *(p++) = IPVS_OPT_PE_DATA;
759 *(p++) = cp->pe_data_len;
760 memcpy(p, cp->pe_data, cp->pe_data_len);
761 p += cp->pe_data_len;
762 if (pe_name_len) {
763 /* Add PE_NAME */
764 *(p++) = IPVS_OPT_PE_NAME;
765 *(p++) = pe_name_len;
766 memcpy(p, cp->pe->name, pe_name_len);
767 p += pe_name_len;
768 }
769 }
770
771 spin_unlock_bh(&ipvs->sync_buff_lock);
772
773 control:
774 /* synchronize its controller if it has */
775 cp = cp->control;
776 if (!cp)
777 return;
778 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
779 pkts = atomic_inc_return(&cp->in_pkts);
780 else
781 pkts = sysctl_sync_threshold(ipvs);
782 goto sloop;
783 }
784
785 /*
786 * fill_param used by version 1
787 */
788 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)789 ip_vs_conn_fill_param_sync(struct netns_ipvs *ipvs, int af, union ip_vs_sync_conn *sc,
790 struct ip_vs_conn_param *p,
791 __u8 *pe_data, unsigned int pe_data_len,
792 __u8 *pe_name, unsigned int pe_name_len)
793 {
794 #ifdef CONFIG_IP_VS_IPV6
795 if (af == AF_INET6)
796 ip_vs_conn_fill_param(ipvs, af, sc->v6.protocol,
797 (const union nf_inet_addr *)&sc->v6.caddr,
798 sc->v6.cport,
799 (const union nf_inet_addr *)&sc->v6.vaddr,
800 sc->v6.vport, p);
801 else
802 #endif
803 ip_vs_conn_fill_param(ipvs, af, sc->v4.protocol,
804 (const union nf_inet_addr *)&sc->v4.caddr,
805 sc->v4.cport,
806 (const union nf_inet_addr *)&sc->v4.vaddr,
807 sc->v4.vport, p);
808 /* Handle pe data */
809 if (pe_data_len) {
810 if (pe_name_len) {
811 char buff[IP_VS_PENAME_MAXLEN+1];
812
813 memcpy(buff, pe_name, pe_name_len);
814 buff[pe_name_len]=0;
815 p->pe = __ip_vs_pe_getbyname(buff);
816 if (!p->pe) {
817 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
818 buff);
819 return 1;
820 }
821 } else {
822 IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
823 return 1;
824 }
825
826 p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC);
827 if (!p->pe_data) {
828 module_put(p->pe->module);
829 return -ENOMEM;
830 }
831 p->pe_data_len = pe_data_len;
832 }
833 return 0;
834 }
835
836 /*
837 * Connection Add / Update.
838 * Common for version 0 and 1 reception of backup sync_conns.
839 * Param: ...
840 * timeout is in sec.
841 */
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)842 static void ip_vs_proc_conn(struct netns_ipvs *ipvs, struct ip_vs_conn_param *param,
843 unsigned int flags, unsigned int state,
844 unsigned int protocol, unsigned int type,
845 const union nf_inet_addr *daddr, __be16 dport,
846 unsigned long timeout, __u32 fwmark,
847 struct ip_vs_sync_conn_options *opt)
848 {
849 struct ip_vs_dest *dest;
850 struct ip_vs_conn *cp;
851
852 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
853 cp = ip_vs_conn_in_get(param);
854 if (cp && ((cp->dport != dport) ||
855 !ip_vs_addr_equal(cp->daf, &cp->daddr, daddr))) {
856 if (!(flags & IP_VS_CONN_F_INACTIVE)) {
857 ip_vs_conn_expire_now(cp);
858 __ip_vs_conn_put(cp);
859 cp = NULL;
860 } else {
861 /* This is the expiration message for the
862 * connection that was already replaced, so we
863 * just ignore it.
864 */
865 __ip_vs_conn_put(cp);
866 kfree(param->pe_data);
867 return;
868 }
869 }
870 } else {
871 cp = ip_vs_ct_in_get(param);
872 }
873
874 if (cp) {
875 /* Free pe_data */
876 kfree(param->pe_data);
877
878 dest = cp->dest;
879 spin_lock_bh(&cp->lock);
880 if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE &&
881 !(flags & IP_VS_CONN_F_TEMPLATE) && dest) {
882 if (flags & IP_VS_CONN_F_INACTIVE) {
883 atomic_dec(&dest->activeconns);
884 atomic_inc(&dest->inactconns);
885 } else {
886 atomic_inc(&dest->activeconns);
887 atomic_dec(&dest->inactconns);
888 }
889 }
890 flags &= IP_VS_CONN_F_BACKUP_UPD_MASK;
891 flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK;
892 cp->flags = flags;
893 spin_unlock_bh(&cp->lock);
894 if (!dest)
895 ip_vs_try_bind_dest(cp);
896 } else {
897 /*
898 * Find the appropriate destination for the connection.
899 * If it is not found the connection will remain unbound
900 * but still handled.
901 */
902 rcu_read_lock();
903 /* This function is only invoked by the synchronization
904 * code. We do not currently support heterogeneous pools
905 * with synchronization, so we can make the assumption that
906 * the svc_af is the same as the dest_af
907 */
908 dest = ip_vs_find_dest(ipvs, type, type, daddr, dport,
909 param->vaddr, param->vport, protocol,
910 fwmark, flags);
911
912 cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest,
913 fwmark);
914 rcu_read_unlock();
915 if (!cp) {
916 kfree(param->pe_data);
917 IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
918 return;
919 }
920 if (!(flags & IP_VS_CONN_F_TEMPLATE))
921 kfree(param->pe_data);
922 }
923
924 if (opt) {
925 cp->in_seq = opt->in_seq;
926 cp->out_seq = opt->out_seq;
927 }
928 atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs));
929 cp->state = state;
930 cp->old_state = cp->state;
931 /*
932 * For Ver 0 messages style
933 * - Not possible to recover the right timeout for templates
934 * - can not find the right fwmark
935 * virtual service. If needed, we can do it for
936 * non-fwmark persistent services.
937 * Ver 1 messages style.
938 * - No problem.
939 */
940 if (timeout) {
941 if (timeout > MAX_SCHEDULE_TIMEOUT / HZ)
942 timeout = MAX_SCHEDULE_TIMEOUT / HZ;
943 cp->timeout = timeout*HZ;
944 } else {
945 struct ip_vs_proto_data *pd;
946
947 pd = ip_vs_proto_data_get(ipvs, protocol);
948 if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table)
949 cp->timeout = pd->timeout_table[state];
950 else
951 cp->timeout = (3*60*HZ);
952 }
953 ip_vs_conn_put(cp);
954 }
955
956 /*
957 * Process received multicast message for Version 0
958 */
ip_vs_process_message_v0(struct netns_ipvs * ipvs,const char * buffer,const size_t buflen)959 static void ip_vs_process_message_v0(struct netns_ipvs *ipvs, const char *buffer,
960 const size_t buflen)
961 {
962 struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer;
963 struct ip_vs_sync_conn_v0 *s;
964 struct ip_vs_sync_conn_options *opt;
965 struct ip_vs_protocol *pp;
966 struct ip_vs_conn_param param;
967 char *p;
968 int i;
969
970 p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0);
971 for (i=0; i<m->nr_conns; i++) {
972 unsigned int flags, state;
973
974 if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
975 IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
976 return;
977 }
978 s = (struct ip_vs_sync_conn_v0 *) p;
979 flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
980 flags &= ~IP_VS_CONN_F_HASHED;
981 if (flags & IP_VS_CONN_F_SEQ_MASK) {
982 opt = (struct ip_vs_sync_conn_options *)&s[1];
983 p += FULL_CONN_SIZE;
984 if (p > buffer+buflen) {
985 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
986 return;
987 }
988 } else {
989 opt = NULL;
990 p += SIMPLE_CONN_SIZE;
991 }
992
993 state = ntohs(s->state);
994 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
995 pp = ip_vs_proto_get(s->protocol);
996 if (!pp) {
997 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
998 s->protocol);
999 continue;
1000 }
1001 if (state >= pp->num_states) {
1002 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
1003 pp->name, state);
1004 continue;
1005 }
1006 } else {
1007 if (state >= IP_VS_CTPL_S_LAST)
1008 IP_VS_DBG(7, "BACKUP v0, Invalid tpl state %u\n",
1009 state);
1010 }
1011
1012 ip_vs_conn_fill_param(ipvs, AF_INET, s->protocol,
1013 (const union nf_inet_addr *)&s->caddr,
1014 s->cport,
1015 (const union nf_inet_addr *)&s->vaddr,
1016 s->vport, ¶m);
1017
1018 /* Send timeout as Zero */
1019 ip_vs_proc_conn(ipvs, ¶m, flags, state, s->protocol, AF_INET,
1020 (union nf_inet_addr *)&s->daddr, s->dport,
1021 0, 0, opt);
1022 }
1023 }
1024
1025 /*
1026 * Handle options
1027 */
ip_vs_proc_seqopt(__u8 * p,unsigned int plen,__u32 * opt_flags,struct ip_vs_sync_conn_options * opt)1028 static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen,
1029 __u32 *opt_flags,
1030 struct ip_vs_sync_conn_options *opt)
1031 {
1032 struct ip_vs_sync_conn_options *topt;
1033
1034 topt = (struct ip_vs_sync_conn_options *)p;
1035
1036 if (plen != sizeof(struct ip_vs_sync_conn_options)) {
1037 IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
1038 return -EINVAL;
1039 }
1040 if (*opt_flags & IPVS_OPT_F_SEQ_DATA) {
1041 IP_VS_DBG(2, "BACKUP, conn options found twice\n");
1042 return -EINVAL;
1043 }
1044 ntoh_seq(&topt->in_seq, &opt->in_seq);
1045 ntoh_seq(&topt->out_seq, &opt->out_seq);
1046 *opt_flags |= IPVS_OPT_F_SEQ_DATA;
1047 return 0;
1048 }
1049
ip_vs_proc_str(__u8 * p,unsigned int plen,unsigned int * data_len,__u8 ** data,unsigned int maxlen,__u32 * opt_flags,__u32 flag)1050 static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len,
1051 __u8 **data, unsigned int maxlen,
1052 __u32 *opt_flags, __u32 flag)
1053 {
1054 if (plen > maxlen) {
1055 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen);
1056 return -EINVAL;
1057 }
1058 if (*opt_flags & flag) {
1059 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag);
1060 return -EINVAL;
1061 }
1062 *data_len = plen;
1063 *data = p;
1064 *opt_flags |= flag;
1065 return 0;
1066 }
1067 /*
1068 * Process a Version 1 sync. connection
1069 */
ip_vs_proc_sync_conn(struct netns_ipvs * ipvs,__u8 * p,__u8 * msg_end)1070 static inline int ip_vs_proc_sync_conn(struct netns_ipvs *ipvs, __u8 *p, __u8 *msg_end)
1071 {
1072 struct ip_vs_sync_conn_options opt;
1073 union ip_vs_sync_conn *s;
1074 struct ip_vs_protocol *pp;
1075 struct ip_vs_conn_param param;
1076 __u32 flags;
1077 unsigned int af, state, pe_data_len=0, pe_name_len=0;
1078 __u8 *pe_data=NULL, *pe_name=NULL;
1079 __u32 opt_flags=0;
1080 int retc=0;
1081
1082 s = (union ip_vs_sync_conn *) p;
1083
1084 if (s->v6.type & STYPE_F_INET6) {
1085 #ifdef CONFIG_IP_VS_IPV6
1086 af = AF_INET6;
1087 p += sizeof(struct ip_vs_sync_v6);
1088 #else
1089 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
1090 retc = 10;
1091 goto out;
1092 #endif
1093 } else if (!s->v4.type) {
1094 af = AF_INET;
1095 p += sizeof(struct ip_vs_sync_v4);
1096 } else {
1097 return -10;
1098 }
1099 if (p > msg_end)
1100 return -20;
1101
1102 /* Process optional params check Type & Len. */
1103 while (p < msg_end) {
1104 int ptype;
1105 int plen;
1106
1107 if (p+2 > msg_end)
1108 return -30;
1109 ptype = *(p++);
1110 plen = *(p++);
1111
1112 if (!plen || ((p + plen) > msg_end))
1113 return -40;
1114 /* Handle seq option p = param data */
1115 switch (ptype & ~IPVS_OPT_F_PARAM) {
1116 case IPVS_OPT_SEQ_DATA:
1117 if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt))
1118 return -50;
1119 break;
1120
1121 case IPVS_OPT_PE_DATA:
1122 if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data,
1123 IP_VS_PEDATA_MAXLEN, &opt_flags,
1124 IPVS_OPT_F_PE_DATA))
1125 return -60;
1126 break;
1127
1128 case IPVS_OPT_PE_NAME:
1129 if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name,
1130 IP_VS_PENAME_MAXLEN, &opt_flags,
1131 IPVS_OPT_F_PE_NAME))
1132 return -70;
1133 break;
1134
1135 default:
1136 /* Param data mandatory ? */
1137 if (!(ptype & IPVS_OPT_F_PARAM)) {
1138 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
1139 ptype & ~IPVS_OPT_F_PARAM);
1140 retc = 20;
1141 goto out;
1142 }
1143 }
1144 p += plen; /* Next option */
1145 }
1146
1147 /* Get flags and Mask off unsupported */
1148 flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK;
1149 flags |= IP_VS_CONN_F_SYNC;
1150 state = ntohs(s->v4.state);
1151
1152 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
1153 pp = ip_vs_proto_get(s->v4.protocol);
1154 if (!pp) {
1155 IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
1156 s->v4.protocol);
1157 retc = 30;
1158 goto out;
1159 }
1160 if (state >= pp->num_states) {
1161 IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
1162 pp->name, state);
1163 retc = 40;
1164 goto out;
1165 }
1166 } else {
1167 if (state >= IP_VS_CTPL_S_LAST)
1168 IP_VS_DBG(7, "BACKUP, Invalid tpl state %u\n",
1169 state);
1170 }
1171 if (ip_vs_conn_fill_param_sync(ipvs, af, s, ¶m, pe_data,
1172 pe_data_len, pe_name, pe_name_len)) {
1173 retc = 50;
1174 goto out;
1175 }
1176 /* If only IPv4, just silent skip IPv6 */
1177 if (af == AF_INET)
1178 ip_vs_proc_conn(ipvs, ¶m, flags, state, s->v4.protocol, af,
1179 (union nf_inet_addr *)&s->v4.daddr, s->v4.dport,
1180 ntohl(s->v4.timeout), ntohl(s->v4.fwmark),
1181 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1182 );
1183 #ifdef CONFIG_IP_VS_IPV6
1184 else
1185 ip_vs_proc_conn(ipvs, ¶m, flags, state, s->v6.protocol, af,
1186 (union nf_inet_addr *)&s->v6.daddr, s->v6.dport,
1187 ntohl(s->v6.timeout), ntohl(s->v6.fwmark),
1188 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1189 );
1190 #endif
1191 ip_vs_pe_put(param.pe);
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 */
ip_vs_process_message(struct netns_ipvs * ipvs,__u8 * buffer,const size_t buflen)1204 static void ip_vs_process_message(struct netns_ipvs *ipvs, __u8 *buffer,
1205 const size_t buflen)
1206 {
1207 struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer;
1208 __u8 *p, *msg_end;
1209 int i, nr_conns;
1210
1211 if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) {
1212 IP_VS_DBG(2, "BACKUP, message header too short\n");
1213 return;
1214 }
1215
1216 if (buflen != ntohs(m2->size)) {
1217 IP_VS_DBG(2, "BACKUP, bogus message size\n");
1218 return;
1219 }
1220 /* SyncID sanity check */
1221 if (ipvs->bcfg.syncid != 0 && m2->syncid != ipvs->bcfg.syncid) {
1222 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
1223 return;
1224 }
1225 /* Handle version 1 message */
1226 if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0)
1227 && (m2->spare == 0)) {
1228
1229 msg_end = buffer + sizeof(struct ip_vs_sync_mesg);
1230 nr_conns = m2->nr_conns;
1231
1232 for (i=0; i<nr_conns; i++) {
1233 union ip_vs_sync_conn *s;
1234 unsigned int size;
1235 int retc;
1236
1237 p = msg_end;
1238 if (p + sizeof(s->v4) > buffer+buflen) {
1239 IP_VS_ERR_RL("BACKUP, Dropping buffer, too small\n");
1240 return;
1241 }
1242 s = (union ip_vs_sync_conn *)p;
1243 size = ntohs(s->v4.ver_size) & SVER_MASK;
1244 msg_end = p + size;
1245 /* Basic sanity checks */
1246 if (msg_end > buffer+buflen) {
1247 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
1248 return;
1249 }
1250 if (ntohs(s->v4.ver_size) >> SVER_SHIFT) {
1251 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
1252 ntohs(s->v4.ver_size) >> SVER_SHIFT);
1253 return;
1254 }
1255 /* Process a single sync_conn */
1256 retc = ip_vs_proc_sync_conn(ipvs, p, msg_end);
1257 if (retc < 0) {
1258 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
1259 retc);
1260 return;
1261 }
1262 /* Make sure we have 32 bit alignment */
1263 msg_end = p + ((size + 3) & ~3);
1264 }
1265 } else {
1266 /* Old type of message */
1267 ip_vs_process_message_v0(ipvs, buffer, buflen);
1268 return;
1269 }
1270 }
1271
1272
1273 /*
1274 * Setup sndbuf (mode=1) or rcvbuf (mode=0)
1275 */
set_sock_size(struct sock * sk,int mode,int val)1276 static void set_sock_size(struct sock *sk, int mode, int val)
1277 {
1278 /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
1279 /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
1280 lock_sock(sk);
1281 if (mode) {
1282 val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2,
1283 READ_ONCE(sysctl_wmem_max));
1284 sk->sk_sndbuf = val * 2;
1285 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1286 } else {
1287 val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2,
1288 READ_ONCE(sysctl_rmem_max));
1289 sk->sk_rcvbuf = val * 2;
1290 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1291 }
1292 release_sock(sk);
1293 }
1294
1295 /*
1296 * Setup loopback of outgoing multicasts on a sending socket
1297 */
set_mcast_loop(struct sock * sk,u_char loop)1298 static void set_mcast_loop(struct sock *sk, u_char loop)
1299 {
1300 struct inet_sock *inet = inet_sk(sk);
1301
1302 /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
1303 lock_sock(sk);
1304 inet->mc_loop = loop ? 1 : 0;
1305 #ifdef CONFIG_IP_VS_IPV6
1306 if (sk->sk_family == AF_INET6) {
1307 struct ipv6_pinfo *np = inet6_sk(sk);
1308
1309 /* IPV6_MULTICAST_LOOP */
1310 np->mc_loop = loop ? 1 : 0;
1311 }
1312 #endif
1313 release_sock(sk);
1314 }
1315
1316 /*
1317 * Specify TTL for outgoing multicasts on a sending socket
1318 */
set_mcast_ttl(struct sock * sk,u_char ttl)1319 static void set_mcast_ttl(struct sock *sk, u_char ttl)
1320 {
1321 struct inet_sock *inet = inet_sk(sk);
1322
1323 /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
1324 lock_sock(sk);
1325 inet->mc_ttl = ttl;
1326 #ifdef CONFIG_IP_VS_IPV6
1327 if (sk->sk_family == AF_INET6) {
1328 struct ipv6_pinfo *np = inet6_sk(sk);
1329
1330 /* IPV6_MULTICAST_HOPS */
1331 np->mcast_hops = ttl;
1332 }
1333 #endif
1334 release_sock(sk);
1335 }
1336
1337 /* Control fragmentation of messages */
set_mcast_pmtudisc(struct sock * sk,int val)1338 static void set_mcast_pmtudisc(struct sock *sk, int val)
1339 {
1340 struct inet_sock *inet = inet_sk(sk);
1341
1342 /* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
1343 lock_sock(sk);
1344 inet->pmtudisc = val;
1345 #ifdef CONFIG_IP_VS_IPV6
1346 if (sk->sk_family == AF_INET6) {
1347 struct ipv6_pinfo *np = inet6_sk(sk);
1348
1349 /* IPV6_MTU_DISCOVER */
1350 np->pmtudisc = val;
1351 }
1352 #endif
1353 release_sock(sk);
1354 }
1355
1356 /*
1357 * Specifiy default interface for outgoing multicasts
1358 */
set_mcast_if(struct sock * sk,struct net_device * dev)1359 static int set_mcast_if(struct sock *sk, struct net_device *dev)
1360 {
1361 struct inet_sock *inet = inet_sk(sk);
1362
1363 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1364 return -EINVAL;
1365
1366 lock_sock(sk);
1367 inet->mc_index = dev->ifindex;
1368 /* inet->mc_addr = 0; */
1369 #ifdef CONFIG_IP_VS_IPV6
1370 if (sk->sk_family == AF_INET6) {
1371 struct ipv6_pinfo *np = inet6_sk(sk);
1372
1373 /* IPV6_MULTICAST_IF */
1374 np->mcast_oif = dev->ifindex;
1375 }
1376 #endif
1377 release_sock(sk);
1378
1379 return 0;
1380 }
1381
1382
1383 /*
1384 * Join a multicast group.
1385 * the group is specified by a class D multicast address 224.0.0.0/8
1386 * in the in_addr structure passed in as a parameter.
1387 */
1388 static int
join_mcast_group(struct sock * sk,struct in_addr * addr,struct net_device * dev)1389 join_mcast_group(struct sock *sk, struct in_addr *addr, struct net_device *dev)
1390 {
1391 struct ip_mreqn mreq;
1392 int ret;
1393
1394 memset(&mreq, 0, sizeof(mreq));
1395 memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
1396
1397 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1398 return -EINVAL;
1399
1400 mreq.imr_ifindex = dev->ifindex;
1401
1402 lock_sock(sk);
1403 ret = ip_mc_join_group(sk, &mreq);
1404 release_sock(sk);
1405
1406 return ret;
1407 }
1408
1409 #ifdef CONFIG_IP_VS_IPV6
join_mcast_group6(struct sock * sk,struct in6_addr * addr,struct net_device * dev)1410 static int join_mcast_group6(struct sock *sk, struct in6_addr *addr,
1411 struct net_device *dev)
1412 {
1413 int ret;
1414
1415 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1416 return -EINVAL;
1417
1418 lock_sock(sk);
1419 ret = ipv6_sock_mc_join(sk, dev->ifindex, addr);
1420 release_sock(sk);
1421
1422 return ret;
1423 }
1424 #endif
1425
bind_mcastif_addr(struct socket * sock,struct net_device * dev)1426 static int bind_mcastif_addr(struct socket *sock, struct net_device *dev)
1427 {
1428 __be32 addr;
1429 struct sockaddr_in sin;
1430
1431 addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
1432 if (!addr)
1433 pr_err("You probably need to specify IP address on "
1434 "multicast interface.\n");
1435
1436 IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
1437 dev->name, &addr);
1438
1439 /* Now bind the socket with the address of multicast interface */
1440 sin.sin_family = AF_INET;
1441 sin.sin_addr.s_addr = addr;
1442 sin.sin_port = 0;
1443
1444 return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
1445 }
1446
get_mcast_sockaddr(union ipvs_sockaddr * sa,int * salen,struct ipvs_sync_daemon_cfg * c,int id)1447 static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen,
1448 struct ipvs_sync_daemon_cfg *c, int id)
1449 {
1450 if (AF_INET6 == c->mcast_af) {
1451 sa->in6 = (struct sockaddr_in6) {
1452 .sin6_family = AF_INET6,
1453 .sin6_port = htons(c->mcast_port + id),
1454 };
1455 sa->in6.sin6_addr = c->mcast_group.in6;
1456 *salen = sizeof(sa->in6);
1457 } else {
1458 sa->in = (struct sockaddr_in) {
1459 .sin_family = AF_INET,
1460 .sin_port = htons(c->mcast_port + id),
1461 };
1462 sa->in.sin_addr = c->mcast_group.in;
1463 *salen = sizeof(sa->in);
1464 }
1465 }
1466
1467 /*
1468 * Set up sending multicast socket over UDP
1469 */
make_send_sock(struct netns_ipvs * ipvs,int id,struct net_device * dev,struct socket ** sock_ret)1470 static int make_send_sock(struct netns_ipvs *ipvs, int id,
1471 struct net_device *dev, struct socket **sock_ret)
1472 {
1473 /* multicast addr */
1474 union ipvs_sockaddr mcast_addr;
1475 struct socket *sock;
1476 int result, salen;
1477
1478 /* First create a socket */
1479 result = sock_create_kern(ipvs->net, ipvs->mcfg.mcast_af, SOCK_DGRAM,
1480 IPPROTO_UDP, &sock);
1481 if (result < 0) {
1482 pr_err("Error during creation of socket; terminating\n");
1483 goto error;
1484 }
1485 *sock_ret = sock;
1486 result = set_mcast_if(sock->sk, dev);
1487 if (result < 0) {
1488 pr_err("Error setting outbound mcast interface\n");
1489 goto error;
1490 }
1491
1492 set_mcast_loop(sock->sk, 0);
1493 set_mcast_ttl(sock->sk, ipvs->mcfg.mcast_ttl);
1494 /* Allow fragmentation if MTU changes */
1495 set_mcast_pmtudisc(sock->sk, IP_PMTUDISC_DONT);
1496 result = sysctl_sync_sock_size(ipvs);
1497 if (result > 0)
1498 set_sock_size(sock->sk, 1, result);
1499
1500 if (AF_INET == ipvs->mcfg.mcast_af)
1501 result = bind_mcastif_addr(sock, dev);
1502 else
1503 result = 0;
1504 if (result < 0) {
1505 pr_err("Error binding address of the mcast interface\n");
1506 goto error;
1507 }
1508
1509 get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->mcfg, id);
1510 result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
1511 salen, 0);
1512 if (result < 0) {
1513 pr_err("Error connecting to the multicast addr\n");
1514 goto error;
1515 }
1516
1517 return 0;
1518
1519 error:
1520 return result;
1521 }
1522
1523
1524 /*
1525 * Set up receiving multicast socket over UDP
1526 */
make_receive_sock(struct netns_ipvs * ipvs,int id,struct net_device * dev,struct socket ** sock_ret)1527 static int make_receive_sock(struct netns_ipvs *ipvs, int id,
1528 struct net_device *dev, struct socket **sock_ret)
1529 {
1530 /* multicast addr */
1531 union ipvs_sockaddr mcast_addr;
1532 struct socket *sock;
1533 int result, salen;
1534
1535 /* First create a socket */
1536 result = sock_create_kern(ipvs->net, ipvs->bcfg.mcast_af, SOCK_DGRAM,
1537 IPPROTO_UDP, &sock);
1538 if (result < 0) {
1539 pr_err("Error during creation of socket; terminating\n");
1540 goto error;
1541 }
1542 *sock_ret = sock;
1543 /* it is equivalent to the REUSEADDR option in user-space */
1544 sock->sk->sk_reuse = SK_CAN_REUSE;
1545 result = sysctl_sync_sock_size(ipvs);
1546 if (result > 0)
1547 set_sock_size(sock->sk, 0, result);
1548
1549 get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id);
1550 sock->sk->sk_bound_dev_if = dev->ifindex;
1551 result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen);
1552 if (result < 0) {
1553 pr_err("Error binding to the multicast addr\n");
1554 goto error;
1555 }
1556
1557 /* join the multicast group */
1558 #ifdef CONFIG_IP_VS_IPV6
1559 if (ipvs->bcfg.mcast_af == AF_INET6)
1560 result = join_mcast_group6(sock->sk, &mcast_addr.in6.sin6_addr,
1561 dev);
1562 else
1563 #endif
1564 result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr,
1565 dev);
1566 if (result < 0) {
1567 pr_err("Error joining to the multicast group\n");
1568 goto error;
1569 }
1570
1571 return 0;
1572
1573 error:
1574 return result;
1575 }
1576
1577
1578 static int
ip_vs_send_async(struct socket * sock,const char * buffer,const size_t length)1579 ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
1580 {
1581 struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL};
1582 struct kvec iov;
1583 int len;
1584
1585 EnterFunction(7);
1586 iov.iov_base = (void *)buffer;
1587 iov.iov_len = length;
1588
1589 len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
1590
1591 LeaveFunction(7);
1592 return len;
1593 }
1594
1595 static int
ip_vs_send_sync_msg(struct socket * sock,struct ip_vs_sync_mesg * msg)1596 ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
1597 {
1598 int msize;
1599 int ret;
1600
1601 msize = ntohs(msg->size);
1602
1603 ret = ip_vs_send_async(sock, (char *)msg, msize);
1604 if (ret >= 0 || ret == -EAGAIN)
1605 return ret;
1606 pr_err("ip_vs_send_async error %d\n", ret);
1607 return 0;
1608 }
1609
1610 static int
ip_vs_receive(struct socket * sock,char * buffer,const size_t buflen)1611 ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
1612 {
1613 struct msghdr msg = {NULL,};
1614 struct kvec iov = {buffer, buflen};
1615 int len;
1616
1617 EnterFunction(7);
1618
1619 /* Receive a packet */
1620 iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, buflen);
1621 len = sock_recvmsg(sock, &msg, MSG_DONTWAIT);
1622 if (len < 0)
1623 return len;
1624
1625 LeaveFunction(7);
1626 return len;
1627 }
1628
1629 /* Wakeup the master thread for sending */
master_wakeup_work_handler(struct work_struct * work)1630 static void master_wakeup_work_handler(struct work_struct *work)
1631 {
1632 struct ipvs_master_sync_state *ms =
1633 container_of(work, struct ipvs_master_sync_state,
1634 master_wakeup_work.work);
1635 struct netns_ipvs *ipvs = ms->ipvs;
1636
1637 spin_lock_bh(&ipvs->sync_lock);
1638 if (ms->sync_queue_len &&
1639 ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) {
1640 int id = (int)(ms - ipvs->ms);
1641
1642 ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE;
1643 wake_up_process(ipvs->master_tinfo[id].task);
1644 }
1645 spin_unlock_bh(&ipvs->sync_lock);
1646 }
1647
1648 /* Get next buffer to send */
1649 static inline struct ip_vs_sync_buff *
next_sync_buff(struct netns_ipvs * ipvs,struct ipvs_master_sync_state * ms)1650 next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
1651 {
1652 struct ip_vs_sync_buff *sb;
1653
1654 sb = sb_dequeue(ipvs, ms);
1655 if (sb)
1656 return sb;
1657 /* Do not delay entries in buffer for more than 2 seconds */
1658 return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME);
1659 }
1660
sync_thread_master(void * data)1661 static int sync_thread_master(void *data)
1662 {
1663 struct ip_vs_sync_thread_data *tinfo = data;
1664 struct netns_ipvs *ipvs = tinfo->ipvs;
1665 struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id];
1666 struct sock *sk = tinfo->sock->sk;
1667 struct ip_vs_sync_buff *sb;
1668
1669 pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
1670 "syncid = %d, id = %d\n",
1671 ipvs->mcfg.mcast_ifn, ipvs->mcfg.syncid, tinfo->id);
1672
1673 for (;;) {
1674 sb = next_sync_buff(ipvs, ms);
1675 if (unlikely(kthread_should_stop()))
1676 break;
1677 if (!sb) {
1678 schedule_timeout(IPVS_SYNC_CHECK_PERIOD);
1679 continue;
1680 }
1681 while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
1682 /* (Ab)use interruptible sleep to avoid increasing
1683 * the load avg.
1684 */
1685 __wait_event_interruptible(*sk_sleep(sk),
1686 sock_writeable(sk) ||
1687 kthread_should_stop());
1688 if (unlikely(kthread_should_stop()))
1689 goto done;
1690 }
1691 ip_vs_sync_buff_release(sb);
1692 }
1693
1694 done:
1695 __set_current_state(TASK_RUNNING);
1696 if (sb)
1697 ip_vs_sync_buff_release(sb);
1698
1699 /* clean up the sync_buff queue */
1700 while ((sb = sb_dequeue(ipvs, ms)))
1701 ip_vs_sync_buff_release(sb);
1702 __set_current_state(TASK_RUNNING);
1703
1704 /* clean up the current sync_buff */
1705 sb = get_curr_sync_buff(ipvs, ms, 0);
1706 if (sb)
1707 ip_vs_sync_buff_release(sb);
1708
1709 return 0;
1710 }
1711
1712
sync_thread_backup(void * data)1713 static int sync_thread_backup(void *data)
1714 {
1715 struct ip_vs_sync_thread_data *tinfo = data;
1716 struct netns_ipvs *ipvs = tinfo->ipvs;
1717 struct sock *sk = tinfo->sock->sk;
1718 struct udp_sock *up = udp_sk(sk);
1719 int len;
1720
1721 pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
1722 "syncid = %d, id = %d\n",
1723 ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
1724
1725 while (!kthread_should_stop()) {
1726 wait_event_interruptible(*sk_sleep(sk),
1727 !skb_queue_empty_lockless(&sk->sk_receive_queue) ||
1728 !skb_queue_empty_lockless(&up->reader_queue) ||
1729 kthread_should_stop());
1730
1731 /* do we have data now? */
1732 while (!skb_queue_empty_lockless(&sk->sk_receive_queue) ||
1733 !skb_queue_empty_lockless(&up->reader_queue)) {
1734 len = ip_vs_receive(tinfo->sock, tinfo->buf,
1735 ipvs->bcfg.sync_maxlen);
1736 if (len <= 0) {
1737 if (len != -EAGAIN)
1738 pr_err("receiving message error\n");
1739 break;
1740 }
1741
1742 ip_vs_process_message(ipvs, tinfo->buf, len);
1743 }
1744 }
1745
1746 return 0;
1747 }
1748
1749
start_sync_thread(struct netns_ipvs * ipvs,struct ipvs_sync_daemon_cfg * c,int state)1750 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c,
1751 int state)
1752 {
1753 struct ip_vs_sync_thread_data *ti = NULL, *tinfo;
1754 struct task_struct *task;
1755 struct net_device *dev;
1756 char *name;
1757 int (*threadfn)(void *data);
1758 int id = 0, count, hlen;
1759 int result = -ENOMEM;
1760 u16 mtu, min_mtu;
1761
1762 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1763 IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %zd bytes\n",
1764 sizeof(struct ip_vs_sync_conn_v0));
1765
1766 /* increase the module use count */
1767 if (!ip_vs_use_count_inc())
1768 return -ENOPROTOOPT;
1769
1770 /* Do not hold one mutex and then to block on another */
1771 for (;;) {
1772 rtnl_lock();
1773 if (mutex_trylock(&ipvs->sync_mutex))
1774 break;
1775 rtnl_unlock();
1776 mutex_lock(&ipvs->sync_mutex);
1777 if (rtnl_trylock())
1778 break;
1779 mutex_unlock(&ipvs->sync_mutex);
1780 }
1781
1782 if (!ipvs->sync_state) {
1783 count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX);
1784 ipvs->threads_mask = count - 1;
1785 } else
1786 count = ipvs->threads_mask + 1;
1787
1788 if (c->mcast_af == AF_UNSPEC) {
1789 c->mcast_af = AF_INET;
1790 c->mcast_group.ip = cpu_to_be32(IP_VS_SYNC_GROUP);
1791 }
1792 if (!c->mcast_port)
1793 c->mcast_port = IP_VS_SYNC_PORT;
1794 if (!c->mcast_ttl)
1795 c->mcast_ttl = 1;
1796
1797 dev = __dev_get_by_name(ipvs->net, c->mcast_ifn);
1798 if (!dev) {
1799 pr_err("Unknown mcast interface: %s\n", c->mcast_ifn);
1800 result = -ENODEV;
1801 goto out_early;
1802 }
1803 hlen = (AF_INET6 == c->mcast_af) ?
1804 sizeof(struct ipv6hdr) + sizeof(struct udphdr) :
1805 sizeof(struct iphdr) + sizeof(struct udphdr);
1806 mtu = (state == IP_VS_STATE_BACKUP) ?
1807 clamp(dev->mtu, 1500U, 65535U) : 1500U;
1808 min_mtu = (state == IP_VS_STATE_BACKUP) ? 1024 : 1;
1809
1810 if (c->sync_maxlen)
1811 c->sync_maxlen = clamp_t(unsigned int,
1812 c->sync_maxlen, min_mtu,
1813 65535 - hlen);
1814 else
1815 c->sync_maxlen = mtu - hlen;
1816
1817 if (state == IP_VS_STATE_MASTER) {
1818 result = -EEXIST;
1819 if (ipvs->ms)
1820 goto out_early;
1821
1822 ipvs->mcfg = *c;
1823 name = "ipvs-m:%d:%d";
1824 threadfn = sync_thread_master;
1825 } else if (state == IP_VS_STATE_BACKUP) {
1826 result = -EEXIST;
1827 if (ipvs->backup_tinfo)
1828 goto out_early;
1829
1830 ipvs->bcfg = *c;
1831 name = "ipvs-b:%d:%d";
1832 threadfn = sync_thread_backup;
1833 } else {
1834 result = -EINVAL;
1835 goto out_early;
1836 }
1837
1838 if (state == IP_VS_STATE_MASTER) {
1839 struct ipvs_master_sync_state *ms;
1840
1841 result = -ENOMEM;
1842 ipvs->ms = kcalloc(count, sizeof(ipvs->ms[0]), GFP_KERNEL);
1843 if (!ipvs->ms)
1844 goto out;
1845 ms = ipvs->ms;
1846 for (id = 0; id < count; id++, ms++) {
1847 INIT_LIST_HEAD(&ms->sync_queue);
1848 ms->sync_queue_len = 0;
1849 ms->sync_queue_delay = 0;
1850 INIT_DELAYED_WORK(&ms->master_wakeup_work,
1851 master_wakeup_work_handler);
1852 ms->ipvs = ipvs;
1853 }
1854 }
1855 result = -ENOMEM;
1856 ti = kcalloc(count, sizeof(struct ip_vs_sync_thread_data),
1857 GFP_KERNEL);
1858 if (!ti)
1859 goto out;
1860
1861 for (id = 0; id < count; id++) {
1862 tinfo = &ti[id];
1863 tinfo->ipvs = ipvs;
1864 if (state == IP_VS_STATE_BACKUP) {
1865 result = -ENOMEM;
1866 tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen,
1867 GFP_KERNEL);
1868 if (!tinfo->buf)
1869 goto out;
1870 }
1871 tinfo->id = id;
1872 if (state == IP_VS_STATE_MASTER)
1873 result = make_send_sock(ipvs, id, dev, &tinfo->sock);
1874 else
1875 result = make_receive_sock(ipvs, id, dev, &tinfo->sock);
1876 if (result < 0)
1877 goto out;
1878
1879 task = kthread_run(threadfn, tinfo, name, ipvs->gen, id);
1880 if (IS_ERR(task)) {
1881 result = PTR_ERR(task);
1882 goto out;
1883 }
1884 tinfo->task = task;
1885 }
1886
1887 /* mark as active */
1888
1889 if (state == IP_VS_STATE_MASTER)
1890 ipvs->master_tinfo = ti;
1891 else
1892 ipvs->backup_tinfo = ti;
1893 spin_lock_bh(&ipvs->sync_buff_lock);
1894 ipvs->sync_state |= state;
1895 spin_unlock_bh(&ipvs->sync_buff_lock);
1896
1897 mutex_unlock(&ipvs->sync_mutex);
1898 rtnl_unlock();
1899
1900 return 0;
1901
1902 out:
1903 /* We do not need RTNL lock anymore, release it here so that
1904 * sock_release below can use rtnl_lock to leave the mcast group.
1905 */
1906 rtnl_unlock();
1907 id = min(id, count - 1);
1908 if (ti) {
1909 for (tinfo = ti + id; tinfo >= ti; tinfo--) {
1910 if (tinfo->task)
1911 kthread_stop(tinfo->task);
1912 }
1913 }
1914 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
1915 kfree(ipvs->ms);
1916 ipvs->ms = NULL;
1917 }
1918 mutex_unlock(&ipvs->sync_mutex);
1919
1920 /* No more mutexes, release socks */
1921 if (ti) {
1922 for (tinfo = ti + id; tinfo >= ti; tinfo--) {
1923 if (tinfo->sock)
1924 sock_release(tinfo->sock);
1925 kfree(tinfo->buf);
1926 }
1927 kfree(ti);
1928 }
1929
1930 /* decrease the module use count */
1931 ip_vs_use_count_dec();
1932 return result;
1933
1934 out_early:
1935 mutex_unlock(&ipvs->sync_mutex);
1936 rtnl_unlock();
1937
1938 /* decrease the module use count */
1939 ip_vs_use_count_dec();
1940 return result;
1941 }
1942
1943
stop_sync_thread(struct netns_ipvs * ipvs,int state)1944 int stop_sync_thread(struct netns_ipvs *ipvs, int state)
1945 {
1946 struct ip_vs_sync_thread_data *ti, *tinfo;
1947 int id;
1948 int retc = -EINVAL;
1949
1950 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1951
1952 mutex_lock(&ipvs->sync_mutex);
1953 if (state == IP_VS_STATE_MASTER) {
1954 retc = -ESRCH;
1955 if (!ipvs->ms)
1956 goto err;
1957 ti = ipvs->master_tinfo;
1958
1959 /*
1960 * The lock synchronizes with sb_queue_tail(), so that we don't
1961 * add sync buffers to the queue, when we are already in
1962 * progress of stopping the master sync daemon.
1963 */
1964
1965 spin_lock_bh(&ipvs->sync_buff_lock);
1966 spin_lock(&ipvs->sync_lock);
1967 ipvs->sync_state &= ~IP_VS_STATE_MASTER;
1968 spin_unlock(&ipvs->sync_lock);
1969 spin_unlock_bh(&ipvs->sync_buff_lock);
1970
1971 retc = 0;
1972 for (id = ipvs->threads_mask; id >= 0; id--) {
1973 struct ipvs_master_sync_state *ms = &ipvs->ms[id];
1974 int ret;
1975
1976 tinfo = &ti[id];
1977 pr_info("stopping master sync thread %d ...\n",
1978 task_pid_nr(tinfo->task));
1979 cancel_delayed_work_sync(&ms->master_wakeup_work);
1980 ret = kthread_stop(tinfo->task);
1981 if (retc >= 0)
1982 retc = ret;
1983 }
1984 kfree(ipvs->ms);
1985 ipvs->ms = NULL;
1986 ipvs->master_tinfo = NULL;
1987 } else if (state == IP_VS_STATE_BACKUP) {
1988 retc = -ESRCH;
1989 if (!ipvs->backup_tinfo)
1990 goto err;
1991 ti = ipvs->backup_tinfo;
1992
1993 ipvs->sync_state &= ~IP_VS_STATE_BACKUP;
1994 retc = 0;
1995 for (id = ipvs->threads_mask; id >= 0; id--) {
1996 int ret;
1997
1998 tinfo = &ti[id];
1999 pr_info("stopping backup sync thread %d ...\n",
2000 task_pid_nr(tinfo->task));
2001 ret = kthread_stop(tinfo->task);
2002 if (retc >= 0)
2003 retc = ret;
2004 }
2005 ipvs->backup_tinfo = NULL;
2006 } else {
2007 goto err;
2008 }
2009 id = ipvs->threads_mask;
2010 mutex_unlock(&ipvs->sync_mutex);
2011
2012 /* No more mutexes, release socks */
2013 for (tinfo = ti + id; tinfo >= ti; tinfo--) {
2014 if (tinfo->sock)
2015 sock_release(tinfo->sock);
2016 kfree(tinfo->buf);
2017 }
2018 kfree(ti);
2019
2020 /* decrease the module use count */
2021 ip_vs_use_count_dec();
2022 return retc;
2023
2024 err:
2025 mutex_unlock(&ipvs->sync_mutex);
2026 return retc;
2027 }
2028
2029 /*
2030 * Initialize data struct for each netns
2031 */
ip_vs_sync_net_init(struct netns_ipvs * ipvs)2032 int __net_init ip_vs_sync_net_init(struct netns_ipvs *ipvs)
2033 {
2034 __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key);
2035 spin_lock_init(&ipvs->sync_lock);
2036 spin_lock_init(&ipvs->sync_buff_lock);
2037 return 0;
2038 }
2039
ip_vs_sync_net_cleanup(struct netns_ipvs * ipvs)2040 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs)
2041 {
2042 int retc;
2043
2044 retc = stop_sync_thread(ipvs, IP_VS_STATE_MASTER);
2045 if (retc && retc != -ESRCH)
2046 pr_err("Failed to stop Master Daemon\n");
2047
2048 retc = stop_sync_thread(ipvs, IP_VS_STATE_BACKUP);
2049 if (retc && retc != -ESRCH)
2050 pr_err("Failed to stop Backup Daemon\n");
2051 }
2052