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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/svcsock.c | |
3 | * | |
4 | * These are the RPC server socket internals. | |
5 | * | |
6 | * The server scheduling algorithm does not always distribute the load | |
7 | * evenly when servicing a single client. May need to modify the | |
8 | * svc_sock_enqueue procedure... | |
9 | * | |
10 | * TCP support is largely untested and may be a little slow. The problem | |
11 | * is that we currently do two separate recvfrom's, one for the 4-byte | |
12 | * record length, and the second for the actual record. This could possibly | |
13 | * be improved by always reading a minimum size of around 100 bytes and | |
14 | * tucking any superfluous bytes away in a temporary store. Still, that | |
15 | * leaves write requests out in the rain. An alternative may be to peek at | |
16 | * the first skb in the queue, and if it matches the next TCP sequence | |
17 | * number, to extract the record marker. Yuck. | |
18 | * | |
19 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
20 | */ | |
21 | ||
22 | #include <linux/sched.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/net.h> | |
26 | #include <linux/in.h> | |
27 | #include <linux/inet.h> | |
28 | #include <linux/udp.h> | |
91483c4b | 29 | #include <linux/tcp.h> |
1da177e4 LT |
30 | #include <linux/unistd.h> |
31 | #include <linux/slab.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/skbuff.h> | |
b41b66d6 | 34 | #include <linux/file.h> |
7dfb7103 | 35 | #include <linux/freezer.h> |
1da177e4 LT |
36 | #include <net/sock.h> |
37 | #include <net/checksum.h> | |
38 | #include <net/ip.h> | |
b92503b2 | 39 | #include <net/ipv6.h> |
c752f073 | 40 | #include <net/tcp_states.h> |
1da177e4 LT |
41 | #include <asm/uaccess.h> |
42 | #include <asm/ioctls.h> | |
43 | ||
44 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 45 | #include <linux/sunrpc/clnt.h> |
1da177e4 LT |
46 | #include <linux/sunrpc/xdr.h> |
47 | #include <linux/sunrpc/svcsock.h> | |
48 | #include <linux/sunrpc/stats.h> | |
49 | ||
50 | /* SMP locking strategy: | |
51 | * | |
3262c816 GB |
52 | * svc_pool->sp_lock protects most of the fields of that pool. |
53 | * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt. | |
54 | * when both need to be taken (rare), svc_serv->sv_lock is first. | |
55 | * BKL protects svc_serv->sv_nrthread. | |
1a68d952 | 56 | * svc_sock->sk_defer_lock protects the svc_sock->sk_deferred list |
c081a0c7 | 57 | * svc_sock->sk_flags.SK_BUSY prevents a svc_sock being enqueued multiply. |
1da177e4 LT |
58 | * |
59 | * Some flags can be set to certain values at any time | |
60 | * providing that certain rules are followed: | |
61 | * | |
1da177e4 | 62 | * SK_CONN, SK_DATA, can be set or cleared at any time. |
cca5172a | 63 | * after a set, svc_sock_enqueue must be called. |
1da177e4 LT |
64 | * after a clear, the socket must be read/accepted |
65 | * if this succeeds, it must be set again. | |
66 | * SK_CLOSE can set at any time. It is never cleared. | |
aaf68cfb N |
67 | * sk_inuse contains a bias of '1' until SK_DEAD is set. |
68 | * so when sk_inuse hits zero, we know the socket is dead | |
69 | * and no-one is using it. | |
70 | * SK_DEAD can only be set while SK_BUSY is held which ensures | |
71 | * no other thread will be using the socket or will try to | |
72 | * set SK_DEAD. | |
1da177e4 LT |
73 | * |
74 | */ | |
75 | ||
76 | #define RPCDBG_FACILITY RPCDBG_SVCSOCK | |
77 | ||
78 | ||
79 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 80 | int *errp, int flags); |
aaf68cfb | 81 | static void svc_delete_socket(struct svc_sock *svsk); |
1da177e4 LT |
82 | static void svc_udp_data_ready(struct sock *, int); |
83 | static int svc_udp_recvfrom(struct svc_rqst *); | |
84 | static int svc_udp_sendto(struct svc_rqst *); | |
85 | ||
86 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk); | |
87 | static int svc_deferred_recv(struct svc_rqst *rqstp); | |
88 | static struct cache_deferred_req *svc_defer(struct cache_req *req); | |
89 | ||
36bdfc8b GB |
90 | /* apparently the "standard" is that clients close |
91 | * idle connections after 5 minutes, servers after | |
92 | * 6 minutes | |
93 | * http://www.connectathon.org/talks96/nfstcp.pdf | |
94 | */ | |
95 | static int svc_conn_age_period = 6*60; | |
96 | ||
ed07536e PZ |
97 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
98 | static struct lock_class_key svc_key[2]; | |
99 | static struct lock_class_key svc_slock_key[2]; | |
100 | ||
101 | static inline void svc_reclassify_socket(struct socket *sock) | |
102 | { | |
103 | struct sock *sk = sock->sk; | |
104 | BUG_ON(sk->sk_lock.owner != NULL); | |
105 | switch (sk->sk_family) { | |
106 | case AF_INET: | |
107 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
108 | &svc_slock_key[0], "sk_lock-AF_INET-NFSD", &svc_key[0]); | |
109 | break; | |
110 | ||
111 | case AF_INET6: | |
112 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
113 | &svc_slock_key[1], "sk_lock-AF_INET6-NFSD", &svc_key[1]); | |
114 | break; | |
115 | ||
116 | default: | |
117 | BUG(); | |
118 | } | |
119 | } | |
120 | #else | |
121 | static inline void svc_reclassify_socket(struct socket *sock) | |
122 | { | |
123 | } | |
124 | #endif | |
125 | ||
ad06e4bd CL |
126 | static char *__svc_print_addr(struct sockaddr *addr, char *buf, size_t len) |
127 | { | |
128 | switch (addr->sa_family) { | |
129 | case AF_INET: | |
130 | snprintf(buf, len, "%u.%u.%u.%u, port=%u", | |
131 | NIPQUAD(((struct sockaddr_in *) addr)->sin_addr), | |
132 | htons(((struct sockaddr_in *) addr)->sin_port)); | |
133 | break; | |
134 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
135 | case AF_INET6: | |
136 | snprintf(buf, len, "%x:%x:%x:%x:%x:%x:%x:%x, port=%u", | |
137 | NIP6(((struct sockaddr_in6 *) addr)->sin6_addr), | |
138 | htons(((struct sockaddr_in6 *) addr)->sin6_port)); | |
139 | break; | |
140 | #endif | |
141 | default: | |
142 | snprintf(buf, len, "unknown address type: %d", addr->sa_family); | |
143 | break; | |
144 | } | |
145 | return buf; | |
146 | } | |
147 | ||
148 | /** | |
149 | * svc_print_addr - Format rq_addr field for printing | |
150 | * @rqstp: svc_rqst struct containing address to print | |
151 | * @buf: target buffer for formatted address | |
152 | * @len: length of target buffer | |
153 | * | |
154 | */ | |
155 | char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) | |
156 | { | |
27459f09 | 157 | return __svc_print_addr(svc_addr(rqstp), buf, len); |
ad06e4bd CL |
158 | } |
159 | EXPORT_SYMBOL_GPL(svc_print_addr); | |
160 | ||
1da177e4 | 161 | /* |
3262c816 | 162 | * Queue up an idle server thread. Must have pool->sp_lock held. |
1da177e4 | 163 | * Note: this is really a stack rather than a queue, so that we only |
3262c816 | 164 | * use as many different threads as we need, and the rest don't pollute |
1da177e4 LT |
165 | * the cache. |
166 | */ | |
167 | static inline void | |
3262c816 | 168 | svc_thread_enqueue(struct svc_pool *pool, struct svc_rqst *rqstp) |
1da177e4 | 169 | { |
3262c816 | 170 | list_add(&rqstp->rq_list, &pool->sp_threads); |
1da177e4 LT |
171 | } |
172 | ||
173 | /* | |
3262c816 | 174 | * Dequeue an nfsd thread. Must have pool->sp_lock held. |
1da177e4 LT |
175 | */ |
176 | static inline void | |
3262c816 | 177 | svc_thread_dequeue(struct svc_pool *pool, struct svc_rqst *rqstp) |
1da177e4 LT |
178 | { |
179 | list_del(&rqstp->rq_list); | |
180 | } | |
181 | ||
182 | /* | |
183 | * Release an skbuff after use | |
184 | */ | |
185 | static inline void | |
186 | svc_release_skb(struct svc_rqst *rqstp) | |
187 | { | |
188 | struct sk_buff *skb = rqstp->rq_skbuff; | |
189 | struct svc_deferred_req *dr = rqstp->rq_deferred; | |
190 | ||
191 | if (skb) { | |
192 | rqstp->rq_skbuff = NULL; | |
193 | ||
194 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
195 | skb_free_datagram(rqstp->rq_sock->sk_sk, skb); | |
196 | } | |
197 | if (dr) { | |
198 | rqstp->rq_deferred = NULL; | |
199 | kfree(dr); | |
200 | } | |
201 | } | |
202 | ||
203 | /* | |
204 | * Any space to write? | |
205 | */ | |
206 | static inline unsigned long | |
207 | svc_sock_wspace(struct svc_sock *svsk) | |
208 | { | |
209 | int wspace; | |
210 | ||
211 | if (svsk->sk_sock->type == SOCK_STREAM) | |
212 | wspace = sk_stream_wspace(svsk->sk_sk); | |
213 | else | |
214 | wspace = sock_wspace(svsk->sk_sk); | |
215 | ||
216 | return wspace; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Queue up a socket with data pending. If there are idle nfsd | |
221 | * processes, wake 'em up. | |
222 | * | |
223 | */ | |
224 | static void | |
225 | svc_sock_enqueue(struct svc_sock *svsk) | |
226 | { | |
227 | struct svc_serv *serv = svsk->sk_server; | |
bfd24160 | 228 | struct svc_pool *pool; |
1da177e4 | 229 | struct svc_rqst *rqstp; |
bfd24160 | 230 | int cpu; |
1da177e4 LT |
231 | |
232 | if (!(svsk->sk_flags & | |
233 | ( (1<<SK_CONN)|(1<<SK_DATA)|(1<<SK_CLOSE)|(1<<SK_DEFERRED)) )) | |
234 | return; | |
235 | if (test_bit(SK_DEAD, &svsk->sk_flags)) | |
236 | return; | |
237 | ||
bfd24160 GB |
238 | cpu = get_cpu(); |
239 | pool = svc_pool_for_cpu(svsk->sk_server, cpu); | |
240 | put_cpu(); | |
241 | ||
3262c816 | 242 | spin_lock_bh(&pool->sp_lock); |
1da177e4 | 243 | |
3262c816 GB |
244 | if (!list_empty(&pool->sp_threads) && |
245 | !list_empty(&pool->sp_sockets)) | |
1da177e4 LT |
246 | printk(KERN_ERR |
247 | "svc_sock_enqueue: threads and sockets both waiting??\n"); | |
248 | ||
249 | if (test_bit(SK_DEAD, &svsk->sk_flags)) { | |
250 | /* Don't enqueue dead sockets */ | |
251 | dprintk("svc: socket %p is dead, not enqueued\n", svsk->sk_sk); | |
252 | goto out_unlock; | |
253 | } | |
254 | ||
c081a0c7 GB |
255 | /* Mark socket as busy. It will remain in this state until the |
256 | * server has processed all pending data and put the socket back | |
257 | * on the idle list. We update SK_BUSY atomically because | |
258 | * it also guards against trying to enqueue the svc_sock twice. | |
259 | */ | |
260 | if (test_and_set_bit(SK_BUSY, &svsk->sk_flags)) { | |
261 | /* Don't enqueue socket while already enqueued */ | |
1da177e4 LT |
262 | dprintk("svc: socket %p busy, not enqueued\n", svsk->sk_sk); |
263 | goto out_unlock; | |
264 | } | |
3262c816 GB |
265 | BUG_ON(svsk->sk_pool != NULL); |
266 | svsk->sk_pool = pool; | |
1da177e4 LT |
267 | |
268 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
c6b0a9f8 | 269 | if (((atomic_read(&svsk->sk_reserved) + serv->sv_max_mesg)*2 |
1da177e4 LT |
270 | > svc_sock_wspace(svsk)) |
271 | && !test_bit(SK_CLOSE, &svsk->sk_flags) | |
272 | && !test_bit(SK_CONN, &svsk->sk_flags)) { | |
273 | /* Don't enqueue while not enough space for reply */ | |
274 | dprintk("svc: socket %p no space, %d*2 > %ld, not enqueued\n", | |
c6b0a9f8 | 275 | svsk->sk_sk, atomic_read(&svsk->sk_reserved)+serv->sv_max_mesg, |
1da177e4 | 276 | svc_sock_wspace(svsk)); |
3262c816 | 277 | svsk->sk_pool = NULL; |
c081a0c7 | 278 | clear_bit(SK_BUSY, &svsk->sk_flags); |
1da177e4 LT |
279 | goto out_unlock; |
280 | } | |
281 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
282 | ||
1da177e4 | 283 | |
3262c816 GB |
284 | if (!list_empty(&pool->sp_threads)) { |
285 | rqstp = list_entry(pool->sp_threads.next, | |
1da177e4 LT |
286 | struct svc_rqst, |
287 | rq_list); | |
288 | dprintk("svc: socket %p served by daemon %p\n", | |
289 | svsk->sk_sk, rqstp); | |
3262c816 | 290 | svc_thread_dequeue(pool, rqstp); |
1da177e4 | 291 | if (rqstp->rq_sock) |
cca5172a | 292 | printk(KERN_ERR |
1da177e4 LT |
293 | "svc_sock_enqueue: server %p, rq_sock=%p!\n", |
294 | rqstp, rqstp->rq_sock); | |
295 | rqstp->rq_sock = svsk; | |
c45c357d | 296 | atomic_inc(&svsk->sk_inuse); |
c6b0a9f8 | 297 | rqstp->rq_reserved = serv->sv_max_mesg; |
5685f0fa | 298 | atomic_add(rqstp->rq_reserved, &svsk->sk_reserved); |
3262c816 | 299 | BUG_ON(svsk->sk_pool != pool); |
1da177e4 LT |
300 | wake_up(&rqstp->rq_wait); |
301 | } else { | |
302 | dprintk("svc: socket %p put into queue\n", svsk->sk_sk); | |
3262c816 GB |
303 | list_add_tail(&svsk->sk_ready, &pool->sp_sockets); |
304 | BUG_ON(svsk->sk_pool != pool); | |
1da177e4 LT |
305 | } |
306 | ||
307 | out_unlock: | |
3262c816 | 308 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 LT |
309 | } |
310 | ||
311 | /* | |
3262c816 | 312 | * Dequeue the first socket. Must be called with the pool->sp_lock held. |
1da177e4 LT |
313 | */ |
314 | static inline struct svc_sock * | |
3262c816 | 315 | svc_sock_dequeue(struct svc_pool *pool) |
1da177e4 LT |
316 | { |
317 | struct svc_sock *svsk; | |
318 | ||
3262c816 | 319 | if (list_empty(&pool->sp_sockets)) |
1da177e4 LT |
320 | return NULL; |
321 | ||
3262c816 | 322 | svsk = list_entry(pool->sp_sockets.next, |
1da177e4 LT |
323 | struct svc_sock, sk_ready); |
324 | list_del_init(&svsk->sk_ready); | |
325 | ||
326 | dprintk("svc: socket %p dequeued, inuse=%d\n", | |
c45c357d | 327 | svsk->sk_sk, atomic_read(&svsk->sk_inuse)); |
1da177e4 LT |
328 | |
329 | return svsk; | |
330 | } | |
331 | ||
332 | /* | |
333 | * Having read something from a socket, check whether it | |
334 | * needs to be re-enqueued. | |
335 | * Note: SK_DATA only gets cleared when a read-attempt finds | |
336 | * no (or insufficient) data. | |
337 | */ | |
338 | static inline void | |
339 | svc_sock_received(struct svc_sock *svsk) | |
340 | { | |
3262c816 | 341 | svsk->sk_pool = NULL; |
1da177e4 LT |
342 | clear_bit(SK_BUSY, &svsk->sk_flags); |
343 | svc_sock_enqueue(svsk); | |
344 | } | |
345 | ||
346 | ||
347 | /** | |
348 | * svc_reserve - change the space reserved for the reply to a request. | |
349 | * @rqstp: The request in question | |
350 | * @space: new max space to reserve | |
351 | * | |
352 | * Each request reserves some space on the output queue of the socket | |
353 | * to make sure the reply fits. This function reduces that reserved | |
354 | * space to be the amount of space used already, plus @space. | |
355 | * | |
356 | */ | |
357 | void svc_reserve(struct svc_rqst *rqstp, int space) | |
358 | { | |
359 | space += rqstp->rq_res.head[0].iov_len; | |
360 | ||
361 | if (space < rqstp->rq_reserved) { | |
362 | struct svc_sock *svsk = rqstp->rq_sock; | |
5685f0fa | 363 | atomic_sub((rqstp->rq_reserved - space), &svsk->sk_reserved); |
1da177e4 | 364 | rqstp->rq_reserved = space; |
1da177e4 LT |
365 | |
366 | svc_sock_enqueue(svsk); | |
367 | } | |
368 | } | |
369 | ||
370 | /* | |
371 | * Release a socket after use. | |
372 | */ | |
373 | static inline void | |
374 | svc_sock_put(struct svc_sock *svsk) | |
375 | { | |
aaf68cfb N |
376 | if (atomic_dec_and_test(&svsk->sk_inuse)) { |
377 | BUG_ON(! test_bit(SK_DEAD, &svsk->sk_flags)); | |
378 | ||
202dd450 | 379 | dprintk("svc: releasing dead socket\n"); |
d6740df9 NB |
380 | if (svsk->sk_sock->file) |
381 | sockfd_put(svsk->sk_sock); | |
382 | else | |
383 | sock_release(svsk->sk_sock); | |
384 | if (svsk->sk_info_authunix != NULL) | |
385 | svcauth_unix_info_release(svsk->sk_info_authunix); | |
1da177e4 LT |
386 | kfree(svsk); |
387 | } | |
1da177e4 LT |
388 | } |
389 | ||
390 | static void | |
391 | svc_sock_release(struct svc_rqst *rqstp) | |
392 | { | |
393 | struct svc_sock *svsk = rqstp->rq_sock; | |
394 | ||
395 | svc_release_skb(rqstp); | |
396 | ||
44524359 | 397 | svc_free_res_pages(rqstp); |
1da177e4 LT |
398 | rqstp->rq_res.page_len = 0; |
399 | rqstp->rq_res.page_base = 0; | |
400 | ||
401 | ||
402 | /* Reset response buffer and release | |
403 | * the reservation. | |
404 | * But first, check that enough space was reserved | |
405 | * for the reply, otherwise we have a bug! | |
406 | */ | |
407 | if ((rqstp->rq_res.len) > rqstp->rq_reserved) | |
408 | printk(KERN_ERR "RPC request reserved %d but used %d\n", | |
409 | rqstp->rq_reserved, | |
410 | rqstp->rq_res.len); | |
411 | ||
412 | rqstp->rq_res.head[0].iov_len = 0; | |
413 | svc_reserve(rqstp, 0); | |
414 | rqstp->rq_sock = NULL; | |
415 | ||
416 | svc_sock_put(svsk); | |
417 | } | |
418 | ||
419 | /* | |
420 | * External function to wake up a server waiting for data | |
3262c816 GB |
421 | * This really only makes sense for services like lockd |
422 | * which have exactly one thread anyway. | |
1da177e4 LT |
423 | */ |
424 | void | |
425 | svc_wake_up(struct svc_serv *serv) | |
426 | { | |
427 | struct svc_rqst *rqstp; | |
3262c816 GB |
428 | unsigned int i; |
429 | struct svc_pool *pool; | |
430 | ||
431 | for (i = 0; i < serv->sv_nrpools; i++) { | |
432 | pool = &serv->sv_pools[i]; | |
433 | ||
434 | spin_lock_bh(&pool->sp_lock); | |
435 | if (!list_empty(&pool->sp_threads)) { | |
436 | rqstp = list_entry(pool->sp_threads.next, | |
437 | struct svc_rqst, | |
438 | rq_list); | |
439 | dprintk("svc: daemon %p woken up.\n", rqstp); | |
440 | /* | |
441 | svc_thread_dequeue(pool, rqstp); | |
442 | rqstp->rq_sock = NULL; | |
443 | */ | |
444 | wake_up(&rqstp->rq_wait); | |
445 | } | |
446 | spin_unlock_bh(&pool->sp_lock); | |
1da177e4 | 447 | } |
1da177e4 LT |
448 | } |
449 | ||
b92503b2 CL |
450 | union svc_pktinfo_u { |
451 | struct in_pktinfo pkti; | |
452 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
453 | struct in6_pktinfo pkti6; | |
454 | #endif | |
455 | }; | |
456 | ||
457 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
458 | { | |
459 | switch (rqstp->rq_sock->sk_sk->sk_family) { | |
460 | case AF_INET: { | |
461 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
462 | ||
463 | cmh->cmsg_level = SOL_IP; | |
464 | cmh->cmsg_type = IP_PKTINFO; | |
465 | pki->ipi_ifindex = 0; | |
466 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
467 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
468 | } | |
469 | break; | |
470 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
471 | case AF_INET6: { | |
472 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
473 | ||
474 | cmh->cmsg_level = SOL_IPV6; | |
475 | cmh->cmsg_type = IPV6_PKTINFO; | |
476 | pki->ipi6_ifindex = 0; | |
477 | ipv6_addr_copy(&pki->ipi6_addr, | |
478 | &rqstp->rq_daddr.addr6); | |
479 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
480 | } | |
481 | break; | |
482 | #endif | |
483 | } | |
484 | return; | |
485 | } | |
486 | ||
1da177e4 LT |
487 | /* |
488 | * Generic sendto routine | |
489 | */ | |
490 | static int | |
491 | svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
492 | { | |
493 | struct svc_sock *svsk = rqstp->rq_sock; | |
494 | struct socket *sock = svsk->sk_sock; | |
495 | int slen; | |
b92503b2 | 496 | char buffer[CMSG_SPACE(sizeof(union svc_pktinfo_u))]; |
1da177e4 | 497 | struct cmsghdr *cmh = (struct cmsghdr *)buffer; |
1da177e4 LT |
498 | int len = 0; |
499 | int result; | |
500 | int size; | |
501 | struct page **ppage = xdr->pages; | |
502 | size_t base = xdr->page_base; | |
503 | unsigned int pglen = xdr->page_len; | |
504 | unsigned int flags = MSG_MORE; | |
ad06e4bd | 505 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
506 | |
507 | slen = xdr->len; | |
508 | ||
509 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
b92503b2 CL |
510 | struct msghdr msg = { |
511 | .msg_name = &rqstp->rq_addr, | |
512 | .msg_namelen = rqstp->rq_addrlen, | |
513 | .msg_control = cmh, | |
514 | .msg_controllen = sizeof(buffer), | |
515 | .msg_flags = MSG_MORE, | |
516 | }; | |
517 | ||
518 | svc_set_cmsg_data(rqstp, cmh); | |
1da177e4 LT |
519 | |
520 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
521 | goto out; | |
522 | } | |
523 | ||
524 | /* send head */ | |
525 | if (slen == xdr->head[0].iov_len) | |
526 | flags = 0; | |
44524359 N |
527 | len = kernel_sendpage(sock, rqstp->rq_respages[0], 0, |
528 | xdr->head[0].iov_len, flags); | |
1da177e4 LT |
529 | if (len != xdr->head[0].iov_len) |
530 | goto out; | |
531 | slen -= xdr->head[0].iov_len; | |
532 | if (slen == 0) | |
533 | goto out; | |
534 | ||
535 | /* send page data */ | |
536 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
537 | while (pglen > 0) { | |
538 | if (slen == size) | |
539 | flags = 0; | |
e6242e92 | 540 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
541 | if (result > 0) |
542 | len += result; | |
543 | if (result != size) | |
544 | goto out; | |
545 | slen -= size; | |
546 | pglen -= size; | |
547 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
548 | base = 0; | |
549 | ppage++; | |
550 | } | |
551 | /* send tail */ | |
552 | if (xdr->tail[0].iov_len) { | |
44524359 N |
553 | result = kernel_sendpage(sock, rqstp->rq_respages[0], |
554 | ((unsigned long)xdr->tail[0].iov_base) | |
cca5172a | 555 | & (PAGE_SIZE-1), |
1da177e4 LT |
556 | xdr->tail[0].iov_len, 0); |
557 | ||
558 | if (result > 0) | |
559 | len += result; | |
560 | } | |
561 | out: | |
ad06e4bd CL |
562 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
563 | rqstp->rq_sock, xdr->head[0].iov_base, xdr->head[0].iov_len, | |
564 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); | |
1da177e4 LT |
565 | |
566 | return len; | |
567 | } | |
568 | ||
80212d59 N |
569 | /* |
570 | * Report socket names for nfsdfs | |
571 | */ | |
572 | static int one_sock_name(char *buf, struct svc_sock *svsk) | |
573 | { | |
574 | int len; | |
575 | ||
576 | switch(svsk->sk_sk->sk_family) { | |
577 | case AF_INET: | |
578 | len = sprintf(buf, "ipv4 %s %u.%u.%u.%u %d\n", | |
579 | svsk->sk_sk->sk_protocol==IPPROTO_UDP? | |
580 | "udp" : "tcp", | |
581 | NIPQUAD(inet_sk(svsk->sk_sk)->rcv_saddr), | |
582 | inet_sk(svsk->sk_sk)->num); | |
583 | break; | |
584 | default: | |
585 | len = sprintf(buf, "*unknown-%d*\n", | |
586 | svsk->sk_sk->sk_family); | |
587 | } | |
588 | return len; | |
589 | } | |
590 | ||
591 | int | |
b41b66d6 | 592 | svc_sock_names(char *buf, struct svc_serv *serv, char *toclose) |
80212d59 | 593 | { |
b41b66d6 | 594 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
595 | int len = 0; |
596 | ||
597 | if (!serv) | |
598 | return 0; | |
aaf68cfb | 599 | spin_lock_bh(&serv->sv_lock); |
80212d59 N |
600 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_list) { |
601 | int onelen = one_sock_name(buf+len, svsk); | |
b41b66d6 N |
602 | if (toclose && strcmp(toclose, buf+len) == 0) |
603 | closesk = svsk; | |
604 | else | |
605 | len += onelen; | |
80212d59 | 606 | } |
aaf68cfb | 607 | spin_unlock_bh(&serv->sv_lock); |
b41b66d6 | 608 | if (closesk) |
5680c446 N |
609 | /* Should unregister with portmap, but you cannot |
610 | * unregister just one protocol... | |
611 | */ | |
aaf68cfb | 612 | svc_close_socket(closesk); |
37a03472 N |
613 | else if (toclose) |
614 | return -ENOENT; | |
80212d59 N |
615 | return len; |
616 | } | |
617 | EXPORT_SYMBOL(svc_sock_names); | |
618 | ||
1da177e4 LT |
619 | /* |
620 | * Check input queue length | |
621 | */ | |
622 | static int | |
623 | svc_recv_available(struct svc_sock *svsk) | |
624 | { | |
1da177e4 LT |
625 | struct socket *sock = svsk->sk_sock; |
626 | int avail, err; | |
627 | ||
e6242e92 | 628 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
629 | |
630 | return (err >= 0)? avail : err; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Generic recvfrom routine. | |
635 | */ | |
636 | static int | |
637 | svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, int buflen) | |
638 | { | |
067d7817 | 639 | struct svc_sock *svsk = rqstp->rq_sock; |
1ba95105 CL |
640 | struct msghdr msg = { |
641 | .msg_flags = MSG_DONTWAIT, | |
642 | }; | |
643 | int len; | |
1da177e4 | 644 | |
1ba95105 CL |
645 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
646 | msg.msg_flags); | |
1da177e4 LT |
647 | |
648 | /* sock_recvmsg doesn't fill in the name/namelen, so we must.. | |
1da177e4 | 649 | */ |
067d7817 CL |
650 | memcpy(&rqstp->rq_addr, &svsk->sk_remote, svsk->sk_remotelen); |
651 | rqstp->rq_addrlen = svsk->sk_remotelen; | |
1da177e4 LT |
652 | |
653 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", | |
1ba95105 | 654 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
655 | |
656 | return len; | |
657 | } | |
658 | ||
659 | /* | |
660 | * Set socket snd and rcv buffer lengths | |
661 | */ | |
662 | static inline void | |
663 | svc_sock_setbufsize(struct socket *sock, unsigned int snd, unsigned int rcv) | |
664 | { | |
665 | #if 0 | |
666 | mm_segment_t oldfs; | |
667 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
668 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
669 | (char*)&snd, sizeof(snd)); | |
670 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
671 | (char*)&rcv, sizeof(rcv)); | |
672 | #else | |
673 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
674 | * which isn't acceptable. Until that is made conditional | |
675 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
676 | * DaveM said I could! | |
677 | */ | |
678 | lock_sock(sock->sk); | |
679 | sock->sk->sk_sndbuf = snd * 2; | |
680 | sock->sk->sk_rcvbuf = rcv * 2; | |
681 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; | |
682 | release_sock(sock->sk); | |
683 | #endif | |
684 | } | |
685 | /* | |
686 | * INET callback when data has been received on the socket. | |
687 | */ | |
688 | static void | |
689 | svc_udp_data_ready(struct sock *sk, int count) | |
690 | { | |
939bb7ef | 691 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 692 | |
939bb7ef NB |
693 | if (svsk) { |
694 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
695 | svsk, sk, count, test_bit(SK_BUSY, &svsk->sk_flags)); | |
696 | set_bit(SK_DATA, &svsk->sk_flags); | |
697 | svc_sock_enqueue(svsk); | |
698 | } | |
1da177e4 LT |
699 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
700 | wake_up_interruptible(sk->sk_sleep); | |
701 | } | |
702 | ||
703 | /* | |
704 | * INET callback when space is newly available on the socket. | |
705 | */ | |
706 | static void | |
707 | svc_write_space(struct sock *sk) | |
708 | { | |
709 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
710 | ||
711 | if (svsk) { | |
712 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
713 | svsk, sk, test_bit(SK_BUSY, &svsk->sk_flags)); | |
714 | svc_sock_enqueue(svsk); | |
715 | } | |
716 | ||
717 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) { | |
939bb7ef | 718 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 LT |
719 | svsk); |
720 | wake_up_interruptible(sk->sk_sleep); | |
721 | } | |
722 | } | |
723 | ||
724 | /* | |
725 | * Receive a datagram from a UDP socket. | |
726 | */ | |
1da177e4 LT |
727 | static int |
728 | svc_udp_recvfrom(struct svc_rqst *rqstp) | |
729 | { | |
27459f09 | 730 | struct sockaddr_in *sin = svc_addr_in(rqstp); |
1da177e4 LT |
731 | struct svc_sock *svsk = rqstp->rq_sock; |
732 | struct svc_serv *serv = svsk->sk_server; | |
733 | struct sk_buff *skb; | |
734 | int err, len; | |
735 | ||
736 | if (test_and_clear_bit(SK_CHNGBUF, &svsk->sk_flags)) | |
737 | /* udp sockets need large rcvbuf as all pending | |
738 | * requests are still in that buffer. sndbuf must | |
739 | * also be large enough that there is enough space | |
3262c816 GB |
740 | * for one reply per thread. We count all threads |
741 | * rather than threads in a particular pool, which | |
742 | * provides an upper bound on the number of threads | |
743 | * which will access the socket. | |
1da177e4 LT |
744 | */ |
745 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
746 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
747 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 LT |
748 | |
749 | if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) { | |
750 | svc_sock_received(svsk); | |
751 | return svc_deferred_recv(rqstp); | |
752 | } | |
753 | ||
aaf68cfb N |
754 | if (test_bit(SK_CLOSE, &svsk->sk_flags)) { |
755 | svc_delete_socket(svsk); | |
756 | return 0; | |
757 | } | |
758 | ||
1da177e4 LT |
759 | clear_bit(SK_DATA, &svsk->sk_flags); |
760 | while ((skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err)) == NULL) { | |
761 | if (err == -EAGAIN) { | |
762 | svc_sock_received(svsk); | |
763 | return err; | |
764 | } | |
765 | /* possibly an icmp error */ | |
766 | dprintk("svc: recvfrom returned error %d\n", -err); | |
767 | } | |
a61bbcf2 PM |
768 | if (skb->tstamp.off_sec == 0) { |
769 | struct timeval tv; | |
770 | ||
771 | tv.tv_sec = xtime.tv_sec; | |
4bcde03d | 772 | tv.tv_usec = xtime.tv_nsec / NSEC_PER_USEC; |
a61bbcf2 | 773 | skb_set_timestamp(skb, &tv); |
cca5172a | 774 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
775 | need that much accuracy */ |
776 | } | |
a61bbcf2 | 777 | skb_get_timestamp(skb, &svsk->sk_sk->sk_stamp); |
1da177e4 LT |
778 | set_bit(SK_DATA, &svsk->sk_flags); /* there may be more data... */ |
779 | ||
780 | /* | |
781 | * Maybe more packets - kick another thread ASAP. | |
782 | */ | |
783 | svc_sock_received(svsk); | |
784 | ||
785 | len = skb->len - sizeof(struct udphdr); | |
786 | rqstp->rq_arg.len = len; | |
787 | ||
788 | rqstp->rq_prot = IPPROTO_UDP; | |
789 | ||
790 | /* Get sender address */ | |
27459f09 CL |
791 | sin->sin_family = AF_INET; |
792 | sin->sin_port = skb->h.uh->source; | |
793 | sin->sin_addr.s_addr = skb->nh.iph->saddr; | |
794 | rqstp->rq_addrlen = sizeof(struct sockaddr_in); | |
795 | ||
796 | /* Remember which interface received this request */ | |
73df0dba | 797 | rqstp->rq_daddr.addr.s_addr = skb->nh.iph->daddr; |
1da177e4 LT |
798 | |
799 | if (skb_is_nonlinear(skb)) { | |
800 | /* we have to copy */ | |
801 | local_bh_disable(); | |
802 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
803 | local_bh_enable(); | |
804 | /* checksum error */ | |
805 | skb_free_datagram(svsk->sk_sk, skb); | |
806 | return 0; | |
807 | } | |
808 | local_bh_enable(); | |
cca5172a | 809 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
810 | } else { |
811 | /* we can use it in-place */ | |
812 | rqstp->rq_arg.head[0].iov_base = skb->data + sizeof(struct udphdr); | |
813 | rqstp->rq_arg.head[0].iov_len = len; | |
fb286bb2 HX |
814 | if (skb_checksum_complete(skb)) { |
815 | skb_free_datagram(svsk->sk_sk, skb); | |
816 | return 0; | |
1da177e4 LT |
817 | } |
818 | rqstp->rq_skbuff = skb; | |
819 | } | |
820 | ||
821 | rqstp->rq_arg.page_base = 0; | |
822 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
823 | rqstp->rq_arg.head[0].iov_len = len; | |
824 | rqstp->rq_arg.page_len = 0; | |
44524359 | 825 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
826 | } else { |
827 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 N |
828 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
829 | (rqstp->rq_arg.page_len + PAGE_SIZE - 1)/ PAGE_SIZE; | |
1da177e4 LT |
830 | } |
831 | ||
832 | if (serv->sv_stats) | |
833 | serv->sv_stats->netudpcnt++; | |
834 | ||
835 | return len; | |
836 | } | |
837 | ||
838 | static int | |
839 | svc_udp_sendto(struct svc_rqst *rqstp) | |
840 | { | |
841 | int error; | |
842 | ||
843 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
844 | if (error == -ECONNREFUSED) | |
845 | /* ICMP error on earlier request. */ | |
846 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
847 | ||
848 | return error; | |
849 | } | |
850 | ||
851 | static void | |
852 | svc_udp_init(struct svc_sock *svsk) | |
853 | { | |
854 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; | |
855 | svsk->sk_sk->sk_write_space = svc_write_space; | |
856 | svsk->sk_recvfrom = svc_udp_recvfrom; | |
857 | svsk->sk_sendto = svc_udp_sendto; | |
858 | ||
859 | /* initialise setting must have enough space to | |
cca5172a | 860 | * receive and respond to one request. |
1da177e4 LT |
861 | * svc_udp_recvfrom will re-adjust if necessary |
862 | */ | |
863 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
864 | 3 * svsk->sk_server->sv_max_mesg, |
865 | 3 * svsk->sk_server->sv_max_mesg); | |
1da177e4 LT |
866 | |
867 | set_bit(SK_DATA, &svsk->sk_flags); /* might have come in before data_ready set up */ | |
868 | set_bit(SK_CHNGBUF, &svsk->sk_flags); | |
869 | } | |
870 | ||
871 | /* | |
872 | * A data_ready event on a listening socket means there's a connection | |
873 | * pending. Do not use state_change as a substitute for it. | |
874 | */ | |
875 | static void | |
876 | svc_tcp_listen_data_ready(struct sock *sk, int count_unused) | |
877 | { | |
939bb7ef | 878 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
879 | |
880 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 881 | sk, sk->sk_state); |
1da177e4 | 882 | |
939bb7ef NB |
883 | /* |
884 | * This callback may called twice when a new connection | |
885 | * is established as a child socket inherits everything | |
886 | * from a parent LISTEN socket. | |
887 | * 1) data_ready method of the parent socket will be called | |
888 | * when one of child sockets become ESTABLISHED. | |
889 | * 2) data_ready method of the child socket may be called | |
890 | * when it receives data before the socket is accepted. | |
891 | * In case of 2, we should ignore it silently. | |
892 | */ | |
893 | if (sk->sk_state == TCP_LISTEN) { | |
894 | if (svsk) { | |
895 | set_bit(SK_CONN, &svsk->sk_flags); | |
896 | svc_sock_enqueue(svsk); | |
897 | } else | |
898 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 899 | } |
939bb7ef | 900 | |
1da177e4 LT |
901 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
902 | wake_up_interruptible_all(sk->sk_sleep); | |
903 | } | |
904 | ||
905 | /* | |
906 | * A state change on a connected socket means it's dying or dead. | |
907 | */ | |
908 | static void | |
909 | svc_tcp_state_change(struct sock *sk) | |
910 | { | |
939bb7ef | 911 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
912 | |
913 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 914 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 915 | |
939bb7ef | 916 | if (!svsk) |
1da177e4 | 917 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef NB |
918 | else { |
919 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
920 | svc_sock_enqueue(svsk); | |
1da177e4 | 921 | } |
1da177e4 LT |
922 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
923 | wake_up_interruptible_all(sk->sk_sleep); | |
924 | } | |
925 | ||
926 | static void | |
927 | svc_tcp_data_ready(struct sock *sk, int count) | |
928 | { | |
939bb7ef | 929 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
930 | |
931 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
932 | sk, sk->sk_user_data); |
933 | if (svsk) { | |
934 | set_bit(SK_DATA, &svsk->sk_flags); | |
935 | svc_sock_enqueue(svsk); | |
936 | } | |
1da177e4 LT |
937 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
938 | wake_up_interruptible(sk->sk_sleep); | |
939 | } | |
940 | ||
bcdb81ae CL |
941 | static inline int svc_port_is_privileged(struct sockaddr *sin) |
942 | { | |
943 | switch (sin->sa_family) { | |
944 | case AF_INET: | |
945 | return ntohs(((struct sockaddr_in *)sin)->sin_port) | |
946 | < PROT_SOCK; | |
947 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
948 | case AF_INET6: | |
949 | return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) | |
950 | < PROT_SOCK; | |
951 | #endif | |
952 | default: | |
953 | return 0; | |
954 | } | |
955 | } | |
956 | ||
1da177e4 LT |
957 | /* |
958 | * Accept a TCP connection | |
959 | */ | |
960 | static void | |
961 | svc_tcp_accept(struct svc_sock *svsk) | |
962 | { | |
cdd88b9f AM |
963 | struct sockaddr_storage addr; |
964 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
1da177e4 LT |
965 | struct svc_serv *serv = svsk->sk_server; |
966 | struct socket *sock = svsk->sk_sock; | |
967 | struct socket *newsock; | |
1da177e4 LT |
968 | struct svc_sock *newsvsk; |
969 | int err, slen; | |
ad06e4bd | 970 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
971 | |
972 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
973 | if (!sock) | |
974 | return; | |
975 | ||
e6242e92 SS |
976 | clear_bit(SK_CONN, &svsk->sk_flags); |
977 | err = kernel_accept(sock, &newsock, O_NONBLOCK); | |
978 | if (err < 0) { | |
1da177e4 LT |
979 | if (err == -ENOMEM) |
980 | printk(KERN_WARNING "%s: no more sockets!\n", | |
981 | serv->sv_name); | |
e6242e92 | 982 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
983 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
984 | serv->sv_name, -err); | |
e6242e92 | 985 | return; |
1da177e4 | 986 | } |
e6242e92 | 987 | |
1da177e4 LT |
988 | set_bit(SK_CONN, &svsk->sk_flags); |
989 | svc_sock_enqueue(svsk); | |
990 | ||
cdd88b9f | 991 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
992 | if (err < 0) { |
993 | if (net_ratelimit()) | |
994 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
995 | serv->sv_name, -err); | |
996 | goto failed; /* aborted connection or whatever */ | |
997 | } | |
998 | ||
999 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
1000 | * hosts here, but when we get encryption, the IP of the host won't |
1001 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 1002 | */ |
cdd88b9f | 1003 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 1004 | dprintk(KERN_WARNING |
ad06e4bd | 1005 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 1006 | serv->sv_name, |
cdd88b9f | 1007 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 1008 | } |
ad06e4bd | 1009 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 1010 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1011 | |
1012 | /* make sure that a write doesn't block forever when | |
1013 | * low on memory | |
1014 | */ | |
1015 | newsock->sk->sk_sndtimeo = HZ*30; | |
1016 | ||
6b174337 CL |
1017 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
1018 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 1019 | goto failed; |
cdd88b9f | 1020 | memcpy(&newsvsk->sk_remote, sin, slen); |
067d7817 CL |
1021 | newsvsk->sk_remotelen = slen; |
1022 | ||
e79eff1f | 1023 | svc_sock_received(newsvsk); |
1da177e4 LT |
1024 | |
1025 | /* make sure that we don't have too many active connections. | |
1026 | * If we have, something must be dropped. | |
1027 | * | |
1028 | * There's no point in trying to do random drop here for | |
1029 | * DoS prevention. The NFS clients does 1 reconnect in 15 | |
1030 | * seconds. An attacker can easily beat that. | |
1031 | * | |
1032 | * The only somewhat efficient mechanism would be if drop | |
1033 | * old connections from the same IP first. But right now | |
1034 | * we don't even record the client IP in svc_sock. | |
1035 | */ | |
1036 | if (serv->sv_tmpcnt > (serv->sv_nrthreads+3)*20) { | |
1037 | struct svc_sock *svsk = NULL; | |
1038 | spin_lock_bh(&serv->sv_lock); | |
1039 | if (!list_empty(&serv->sv_tempsocks)) { | |
1040 | if (net_ratelimit()) { | |
1041 | /* Try to help the admin */ | |
1042 | printk(KERN_NOTICE "%s: too many open TCP " | |
1043 | "sockets, consider increasing the " | |
1044 | "number of nfsd threads\n", | |
1045 | serv->sv_name); | |
ad06e4bd CL |
1046 | printk(KERN_NOTICE |
1047 | "%s: last TCP connect from %s\n", | |
1048 | serv->sv_name, buf); | |
1da177e4 LT |
1049 | } |
1050 | /* | |
1051 | * Always select the oldest socket. It's not fair, | |
1052 | * but so is life | |
1053 | */ | |
1054 | svsk = list_entry(serv->sv_tempsocks.prev, | |
1055 | struct svc_sock, | |
1056 | sk_list); | |
1057 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
c45c357d | 1058 | atomic_inc(&svsk->sk_inuse); |
1da177e4 LT |
1059 | } |
1060 | spin_unlock_bh(&serv->sv_lock); | |
1061 | ||
1062 | if (svsk) { | |
1063 | svc_sock_enqueue(svsk); | |
1064 | svc_sock_put(svsk); | |
1065 | } | |
1066 | ||
1067 | } | |
1068 | ||
1069 | if (serv->sv_stats) | |
1070 | serv->sv_stats->nettcpconn++; | |
1071 | ||
1072 | return; | |
1073 | ||
1074 | failed: | |
1075 | sock_release(newsock); | |
1076 | return; | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * Receive data from a TCP socket. | |
1081 | */ | |
1082 | static int | |
1083 | svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1084 | { | |
1085 | struct svc_sock *svsk = rqstp->rq_sock; | |
1086 | struct svc_serv *serv = svsk->sk_server; | |
1087 | int len; | |
3cc03b16 | 1088 | struct kvec *vec; |
1da177e4 LT |
1089 | int pnum, vlen; |
1090 | ||
1091 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1092 | svsk, test_bit(SK_DATA, &svsk->sk_flags), | |
1093 | test_bit(SK_CONN, &svsk->sk_flags), | |
1094 | test_bit(SK_CLOSE, &svsk->sk_flags)); | |
1095 | ||
1096 | if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) { | |
1097 | svc_sock_received(svsk); | |
1098 | return svc_deferred_recv(rqstp); | |
1099 | } | |
1100 | ||
1101 | if (test_bit(SK_CLOSE, &svsk->sk_flags)) { | |
1102 | svc_delete_socket(svsk); | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1a047060 | 1106 | if (svsk->sk_sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1107 | svc_tcp_accept(svsk); |
1108 | svc_sock_received(svsk); | |
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | if (test_and_clear_bit(SK_CHNGBUF, &svsk->sk_flags)) | |
1113 | /* sndbuf needs to have room for one request | |
1114 | * per thread, otherwise we can stall even when the | |
1115 | * network isn't a bottleneck. | |
3262c816 GB |
1116 | * |
1117 | * We count all threads rather than threads in a | |
1118 | * particular pool, which provides an upper bound | |
1119 | * on the number of threads which will access the socket. | |
1120 | * | |
1da177e4 | 1121 | * rcvbuf just needs to be able to hold a few requests. |
cca5172a | 1122 | * Normally they will be removed from the queue |
1da177e4 LT |
1123 | * as soon a a complete request arrives. |
1124 | */ | |
1125 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
1126 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
1127 | 3 * serv->sv_max_mesg); | |
1da177e4 LT |
1128 | |
1129 | clear_bit(SK_DATA, &svsk->sk_flags); | |
1130 | ||
1131 | /* Receive data. If we haven't got the record length yet, get | |
1132 | * the next four bytes. Otherwise try to gobble up as much as | |
1133 | * possible up to the complete record length. | |
1134 | */ | |
1135 | if (svsk->sk_tcplen < 4) { | |
1136 | unsigned long want = 4 - svsk->sk_tcplen; | |
1137 | struct kvec iov; | |
1138 | ||
1139 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; | |
1140 | iov.iov_len = want; | |
1141 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
1142 | goto error; | |
1143 | svsk->sk_tcplen += len; | |
1144 | ||
1145 | if (len < want) { | |
1146 | dprintk("svc: short recvfrom while reading record length (%d of %lu)\n", | |
cca5172a | 1147 | len, want); |
1da177e4 LT |
1148 | svc_sock_received(svsk); |
1149 | return -EAGAIN; /* record header not complete */ | |
1150 | } | |
1151 | ||
1152 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
1153 | if (!(svsk->sk_reclen & 0x80000000)) { | |
1154 | /* FIXME: technically, a record can be fragmented, | |
1155 | * and non-terminal fragments will not have the top | |
1156 | * bit set in the fragment length header. | |
1157 | * But apparently no known nfs clients send fragmented | |
1158 | * records. */ | |
34e9a63b N |
1159 | if (net_ratelimit()) |
1160 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
1161 | " (non-terminal)\n", | |
1162 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
1163 | goto err_delete; |
1164 | } | |
1165 | svsk->sk_reclen &= 0x7fffffff; | |
1166 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); | |
c6b0a9f8 | 1167 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b N |
1168 | if (net_ratelimit()) |
1169 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
1170 | " (large)\n", | |
1171 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
1172 | goto err_delete; |
1173 | } | |
1174 | } | |
1175 | ||
1176 | /* Check whether enough data is available */ | |
1177 | len = svc_recv_available(svsk); | |
1178 | if (len < 0) | |
1179 | goto error; | |
1180 | ||
1181 | if (len < svsk->sk_reclen) { | |
1182 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
1183 | len, svsk->sk_reclen); | |
1184 | svc_sock_received(svsk); | |
1185 | return -EAGAIN; /* record not complete */ | |
1186 | } | |
1187 | len = svsk->sk_reclen; | |
1188 | set_bit(SK_DATA, &svsk->sk_flags); | |
1189 | ||
3cc03b16 | 1190 | vec = rqstp->rq_vec; |
1da177e4 LT |
1191 | vec[0] = rqstp->rq_arg.head[0]; |
1192 | vlen = PAGE_SIZE; | |
1193 | pnum = 1; | |
1194 | while (vlen < len) { | |
44524359 | 1195 | vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]); |
1da177e4 LT |
1196 | vec[pnum].iov_len = PAGE_SIZE; |
1197 | pnum++; | |
1198 | vlen += PAGE_SIZE; | |
1199 | } | |
44524359 | 1200 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1201 | |
1202 | /* Now receive data */ | |
1203 | len = svc_recvfrom(rqstp, vec, pnum, len); | |
1204 | if (len < 0) | |
1205 | goto error; | |
1206 | ||
1207 | dprintk("svc: TCP complete record (%d bytes)\n", len); | |
1208 | rqstp->rq_arg.len = len; | |
1209 | rqstp->rq_arg.page_base = 0; | |
1210 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
1211 | rqstp->rq_arg.head[0].iov_len = len; | |
1212 | rqstp->rq_arg.page_len = 0; | |
1213 | } else { | |
1214 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
1215 | } | |
1216 | ||
1217 | rqstp->rq_skbuff = NULL; | |
1218 | rqstp->rq_prot = IPPROTO_TCP; | |
1219 | ||
1220 | /* Reset TCP read info */ | |
1221 | svsk->sk_reclen = 0; | |
1222 | svsk->sk_tcplen = 0; | |
1223 | ||
1224 | svc_sock_received(svsk); | |
1225 | if (serv->sv_stats) | |
1226 | serv->sv_stats->nettcpcnt++; | |
1227 | ||
1228 | return len; | |
1229 | ||
1230 | err_delete: | |
1231 | svc_delete_socket(svsk); | |
1232 | return -EAGAIN; | |
1233 | ||
1234 | error: | |
1235 | if (len == -EAGAIN) { | |
1236 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
1237 | svc_sock_received(svsk); | |
1238 | } else { | |
1239 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
1240 | svsk->sk_server->sv_name, -len); | |
93fbf1a5 | 1241 | goto err_delete; |
1da177e4 LT |
1242 | } |
1243 | ||
1244 | return len; | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | * Send out data on TCP socket. | |
1249 | */ | |
1250 | static int | |
1251 | svc_tcp_sendto(struct svc_rqst *rqstp) | |
1252 | { | |
1253 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1254 | int sent; | |
d8ed029d | 1255 | __be32 reclen; |
1da177e4 LT |
1256 | |
1257 | /* Set up the first element of the reply kvec. | |
1258 | * Any other kvecs that may be in use have been taken | |
1259 | * care of by the server implementation itself. | |
1260 | */ | |
1261 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1262 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1263 | ||
1264 | if (test_bit(SK_DEAD, &rqstp->rq_sock->sk_flags)) | |
1265 | return -ENOTCONN; | |
1266 | ||
1267 | sent = svc_sendto(rqstp, &rqstp->rq_res); | |
1268 | if (sent != xbufp->len) { | |
1269 | printk(KERN_NOTICE "rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n", | |
1270 | rqstp->rq_sock->sk_server->sv_name, | |
1271 | (sent<0)?"got error":"sent only", | |
1272 | sent, xbufp->len); | |
aaf68cfb N |
1273 | set_bit(SK_CLOSE, &rqstp->rq_sock->sk_flags); |
1274 | svc_sock_enqueue(rqstp->rq_sock); | |
1da177e4 LT |
1275 | sent = -EAGAIN; |
1276 | } | |
1277 | return sent; | |
1278 | } | |
1279 | ||
1280 | static void | |
1281 | svc_tcp_init(struct svc_sock *svsk) | |
1282 | { | |
1283 | struct sock *sk = svsk->sk_sk; | |
1284 | struct tcp_sock *tp = tcp_sk(sk); | |
1285 | ||
1286 | svsk->sk_recvfrom = svc_tcp_recvfrom; | |
1287 | svsk->sk_sendto = svc_tcp_sendto; | |
1288 | ||
1289 | if (sk->sk_state == TCP_LISTEN) { | |
1290 | dprintk("setting up TCP socket for listening\n"); | |
1291 | sk->sk_data_ready = svc_tcp_listen_data_ready; | |
1292 | set_bit(SK_CONN, &svsk->sk_flags); | |
1293 | } else { | |
1294 | dprintk("setting up TCP socket for reading\n"); | |
1295 | sk->sk_state_change = svc_tcp_state_change; | |
1296 | sk->sk_data_ready = svc_tcp_data_ready; | |
1297 | sk->sk_write_space = svc_write_space; | |
1298 | ||
1299 | svsk->sk_reclen = 0; | |
1300 | svsk->sk_tcplen = 0; | |
1301 | ||
1302 | tp->nonagle = 1; /* disable Nagle's algorithm */ | |
1303 | ||
1304 | /* initialise setting must have enough space to | |
cca5172a | 1305 | * receive and respond to one request. |
1da177e4 LT |
1306 | * svc_tcp_recvfrom will re-adjust if necessary |
1307 | */ | |
1308 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
1309 | 3 * svsk->sk_server->sv_max_mesg, |
1310 | 3 * svsk->sk_server->sv_max_mesg); | |
1da177e4 LT |
1311 | |
1312 | set_bit(SK_CHNGBUF, &svsk->sk_flags); | |
1313 | set_bit(SK_DATA, &svsk->sk_flags); | |
cca5172a | 1314 | if (sk->sk_state != TCP_ESTABLISHED) |
1da177e4 LT |
1315 | set_bit(SK_CLOSE, &svsk->sk_flags); |
1316 | } | |
1317 | } | |
1318 | ||
1319 | void | |
1320 | svc_sock_update_bufs(struct svc_serv *serv) | |
1321 | { | |
1322 | /* | |
1323 | * The number of server threads has changed. Update | |
1324 | * rcvbuf and sndbuf accordingly on all sockets | |
1325 | */ | |
1326 | struct list_head *le; | |
1327 | ||
1328 | spin_lock_bh(&serv->sv_lock); | |
1329 | list_for_each(le, &serv->sv_permsocks) { | |
cca5172a | 1330 | struct svc_sock *svsk = |
1da177e4 LT |
1331 | list_entry(le, struct svc_sock, sk_list); |
1332 | set_bit(SK_CHNGBUF, &svsk->sk_flags); | |
1333 | } | |
1334 | list_for_each(le, &serv->sv_tempsocks) { | |
1335 | struct svc_sock *svsk = | |
1336 | list_entry(le, struct svc_sock, sk_list); | |
1337 | set_bit(SK_CHNGBUF, &svsk->sk_flags); | |
1338 | } | |
1339 | spin_unlock_bh(&serv->sv_lock); | |
1340 | } | |
1341 | ||
1342 | /* | |
3262c816 GB |
1343 | * Receive the next request on any socket. This code is carefully |
1344 | * organised not to touch any cachelines in the shared svc_serv | |
1345 | * structure, only cachelines in the local svc_pool. | |
1da177e4 LT |
1346 | */ |
1347 | int | |
6fb2b47f | 1348 | svc_recv(struct svc_rqst *rqstp, long timeout) |
1da177e4 | 1349 | { |
27459f09 | 1350 | struct svc_sock *svsk = NULL; |
6fb2b47f | 1351 | struct svc_serv *serv = rqstp->rq_server; |
3262c816 | 1352 | struct svc_pool *pool = rqstp->rq_pool; |
44524359 | 1353 | int len, i; |
1da177e4 LT |
1354 | int pages; |
1355 | struct xdr_buf *arg; | |
1356 | DECLARE_WAITQUEUE(wait, current); | |
1357 | ||
1358 | dprintk("svc: server %p waiting for data (to = %ld)\n", | |
1359 | rqstp, timeout); | |
1360 | ||
1361 | if (rqstp->rq_sock) | |
cca5172a | 1362 | printk(KERN_ERR |
1da177e4 LT |
1363 | "svc_recv: service %p, socket not NULL!\n", |
1364 | rqstp); | |
1365 | if (waitqueue_active(&rqstp->rq_wait)) | |
cca5172a | 1366 | printk(KERN_ERR |
1da177e4 LT |
1367 | "svc_recv: service %p, wait queue active!\n", |
1368 | rqstp); | |
1369 | ||
1da177e4 LT |
1370 | |
1371 | /* now allocate needed pages. If we get a failure, sleep briefly */ | |
c6b0a9f8 | 1372 | pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE; |
44524359 N |
1373 | for (i=0; i < pages ; i++) |
1374 | while (rqstp->rq_pages[i] == NULL) { | |
1375 | struct page *p = alloc_page(GFP_KERNEL); | |
1376 | if (!p) | |
1377 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); | |
1378 | rqstp->rq_pages[i] = p; | |
1da177e4 | 1379 | } |
250f3915 N |
1380 | rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ |
1381 | BUG_ON(pages >= RPCSVC_MAXPAGES); | |
1da177e4 LT |
1382 | |
1383 | /* Make arg->head point to first page and arg->pages point to rest */ | |
1384 | arg = &rqstp->rq_arg; | |
44524359 | 1385 | arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); |
1da177e4 | 1386 | arg->head[0].iov_len = PAGE_SIZE; |
44524359 | 1387 | arg->pages = rqstp->rq_pages + 1; |
1da177e4 LT |
1388 | arg->page_base = 0; |
1389 | /* save at least one page for response */ | |
1390 | arg->page_len = (pages-2)*PAGE_SIZE; | |
1391 | arg->len = (pages-1)*PAGE_SIZE; | |
1392 | arg->tail[0].iov_len = 0; | |
3e1d1d28 CL |
1393 | |
1394 | try_to_freeze(); | |
1887b935 | 1395 | cond_resched(); |
1da177e4 LT |
1396 | if (signalled()) |
1397 | return -EINTR; | |
1398 | ||
3262c816 GB |
1399 | spin_lock_bh(&pool->sp_lock); |
1400 | if ((svsk = svc_sock_dequeue(pool)) != NULL) { | |
1da177e4 | 1401 | rqstp->rq_sock = svsk; |
c45c357d | 1402 | atomic_inc(&svsk->sk_inuse); |
c6b0a9f8 | 1403 | rqstp->rq_reserved = serv->sv_max_mesg; |
5685f0fa | 1404 | atomic_add(rqstp->rq_reserved, &svsk->sk_reserved); |
1da177e4 LT |
1405 | } else { |
1406 | /* No data pending. Go to sleep */ | |
3262c816 | 1407 | svc_thread_enqueue(pool, rqstp); |
1da177e4 LT |
1408 | |
1409 | /* | |
1410 | * We have to be able to interrupt this wait | |
1411 | * to bring down the daemons ... | |
1412 | */ | |
1413 | set_current_state(TASK_INTERRUPTIBLE); | |
1414 | add_wait_queue(&rqstp->rq_wait, &wait); | |
3262c816 | 1415 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 LT |
1416 | |
1417 | schedule_timeout(timeout); | |
1418 | ||
3e1d1d28 | 1419 | try_to_freeze(); |
1da177e4 | 1420 | |
3262c816 | 1421 | spin_lock_bh(&pool->sp_lock); |
1da177e4 LT |
1422 | remove_wait_queue(&rqstp->rq_wait, &wait); |
1423 | ||
1424 | if (!(svsk = rqstp->rq_sock)) { | |
3262c816 GB |
1425 | svc_thread_dequeue(pool, rqstp); |
1426 | spin_unlock_bh(&pool->sp_lock); | |
1da177e4 LT |
1427 | dprintk("svc: server %p, no data yet\n", rqstp); |
1428 | return signalled()? -EINTR : -EAGAIN; | |
1429 | } | |
1430 | } | |
3262c816 | 1431 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 | 1432 | |
3262c816 GB |
1433 | dprintk("svc: server %p, pool %u, socket %p, inuse=%d\n", |
1434 | rqstp, pool->sp_id, svsk, atomic_read(&svsk->sk_inuse)); | |
1da177e4 LT |
1435 | len = svsk->sk_recvfrom(rqstp); |
1436 | dprintk("svc: got len=%d\n", len); | |
1437 | ||
1438 | /* No data, incomplete (TCP) read, or accept() */ | |
1439 | if (len == 0 || len == -EAGAIN) { | |
1440 | rqstp->rq_res.len = 0; | |
1441 | svc_sock_release(rqstp); | |
1442 | return -EAGAIN; | |
1443 | } | |
1444 | svsk->sk_lastrecv = get_seconds(); | |
36bdfc8b | 1445 | clear_bit(SK_OLD, &svsk->sk_flags); |
1da177e4 | 1446 | |
bcdb81ae | 1447 | rqstp->rq_secure = svc_port_is_privileged(svc_addr(rqstp)); |
1da177e4 LT |
1448 | rqstp->rq_chandle.defer = svc_defer; |
1449 | ||
1450 | if (serv->sv_stats) | |
1451 | serv->sv_stats->netcnt++; | |
1452 | return len; | |
1453 | } | |
1454 | ||
cca5172a | 1455 | /* |
1da177e4 LT |
1456 | * Drop request |
1457 | */ | |
1458 | void | |
1459 | svc_drop(struct svc_rqst *rqstp) | |
1460 | { | |
1461 | dprintk("svc: socket %p dropped request\n", rqstp->rq_sock); | |
1462 | svc_sock_release(rqstp); | |
1463 | } | |
1464 | ||
1465 | /* | |
1466 | * Return reply to client. | |
1467 | */ | |
1468 | int | |
1469 | svc_send(struct svc_rqst *rqstp) | |
1470 | { | |
1471 | struct svc_sock *svsk; | |
1472 | int len; | |
1473 | struct xdr_buf *xb; | |
1474 | ||
1475 | if ((svsk = rqstp->rq_sock) == NULL) { | |
1476 | printk(KERN_WARNING "NULL socket pointer in %s:%d\n", | |
1477 | __FILE__, __LINE__); | |
1478 | return -EFAULT; | |
1479 | } | |
1480 | ||
1481 | /* release the receive skb before sending the reply */ | |
1482 | svc_release_skb(rqstp); | |
1483 | ||
1484 | /* calculate over-all length */ | |
1485 | xb = & rqstp->rq_res; | |
1486 | xb->len = xb->head[0].iov_len + | |
1487 | xb->page_len + | |
1488 | xb->tail[0].iov_len; | |
1489 | ||
57b47a53 IM |
1490 | /* Grab svsk->sk_mutex to serialize outgoing data. */ |
1491 | mutex_lock(&svsk->sk_mutex); | |
1da177e4 LT |
1492 | if (test_bit(SK_DEAD, &svsk->sk_flags)) |
1493 | len = -ENOTCONN; | |
1494 | else | |
1495 | len = svsk->sk_sendto(rqstp); | |
57b47a53 | 1496 | mutex_unlock(&svsk->sk_mutex); |
1da177e4 LT |
1497 | svc_sock_release(rqstp); |
1498 | ||
1499 | if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN) | |
1500 | return 0; | |
1501 | return len; | |
1502 | } | |
1503 | ||
36bdfc8b GB |
1504 | /* |
1505 | * Timer function to close old temporary sockets, using | |
1506 | * a mark-and-sweep algorithm. | |
1507 | */ | |
1508 | static void | |
1509 | svc_age_temp_sockets(unsigned long closure) | |
1510 | { | |
1511 | struct svc_serv *serv = (struct svc_serv *)closure; | |
1512 | struct svc_sock *svsk; | |
1513 | struct list_head *le, *next; | |
1514 | LIST_HEAD(to_be_aged); | |
1515 | ||
1516 | dprintk("svc_age_temp_sockets\n"); | |
1517 | ||
1518 | if (!spin_trylock_bh(&serv->sv_lock)) { | |
1519 | /* busy, try again 1 sec later */ | |
1520 | dprintk("svc_age_temp_sockets: busy\n"); | |
1521 | mod_timer(&serv->sv_temptimer, jiffies + HZ); | |
1522 | return; | |
1523 | } | |
1524 | ||
1525 | list_for_each_safe(le, next, &serv->sv_tempsocks) { | |
1526 | svsk = list_entry(le, struct svc_sock, sk_list); | |
1527 | ||
1528 | if (!test_and_set_bit(SK_OLD, &svsk->sk_flags)) | |
1529 | continue; | |
c45c357d | 1530 | if (atomic_read(&svsk->sk_inuse) || test_bit(SK_BUSY, &svsk->sk_flags)) |
36bdfc8b | 1531 | continue; |
c45c357d | 1532 | atomic_inc(&svsk->sk_inuse); |
36bdfc8b GB |
1533 | list_move(le, &to_be_aged); |
1534 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
1535 | set_bit(SK_DETACHED, &svsk->sk_flags); | |
1536 | } | |
1537 | spin_unlock_bh(&serv->sv_lock); | |
1538 | ||
1539 | while (!list_empty(&to_be_aged)) { | |
1540 | le = to_be_aged.next; | |
1541 | /* fiddling the sk_list node is safe 'cos we're SK_DETACHED */ | |
1542 | list_del_init(le); | |
1543 | svsk = list_entry(le, struct svc_sock, sk_list); | |
1544 | ||
1545 | dprintk("queuing svsk %p for closing, %lu seconds old\n", | |
1546 | svsk, get_seconds() - svsk->sk_lastrecv); | |
1547 | ||
1548 | /* a thread will dequeue and close it soon */ | |
1549 | svc_sock_enqueue(svsk); | |
1550 | svc_sock_put(svsk); | |
1551 | } | |
1552 | ||
1553 | mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); | |
1554 | } | |
1555 | ||
1da177e4 LT |
1556 | /* |
1557 | * Initialize socket for RPC use and create svc_sock struct | |
1558 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1559 | */ | |
6b174337 CL |
1560 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1561 | struct socket *sock, | |
1562 | int *errp, int flags) | |
1da177e4 LT |
1563 | { |
1564 | struct svc_sock *svsk; | |
1565 | struct sock *inet; | |
6b174337 CL |
1566 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1567 | int is_temporary = flags & SVC_SOCK_TEMPORARY; | |
1da177e4 LT |
1568 | |
1569 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1570 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1571 | *errp = -ENOMEM; |
1572 | return NULL; | |
1573 | } | |
1da177e4 LT |
1574 | |
1575 | inet = sock->sk; | |
1576 | ||
1577 | /* Register socket with portmapper */ | |
1578 | if (*errp >= 0 && pmap_register) | |
1579 | *errp = svc_register(serv, inet->sk_protocol, | |
1580 | ntohs(inet_sk(inet)->sport)); | |
1581 | ||
1582 | if (*errp < 0) { | |
1583 | kfree(svsk); | |
1584 | return NULL; | |
1585 | } | |
1586 | ||
1587 | set_bit(SK_BUSY, &svsk->sk_flags); | |
1588 | inet->sk_user_data = svsk; | |
1589 | svsk->sk_sock = sock; | |
1590 | svsk->sk_sk = inet; | |
1591 | svsk->sk_ostate = inet->sk_state_change; | |
1592 | svsk->sk_odata = inet->sk_data_ready; | |
1593 | svsk->sk_owspace = inet->sk_write_space; | |
1594 | svsk->sk_server = serv; | |
aaf68cfb | 1595 | atomic_set(&svsk->sk_inuse, 1); |
1da177e4 | 1596 | svsk->sk_lastrecv = get_seconds(); |
1a68d952 | 1597 | spin_lock_init(&svsk->sk_defer_lock); |
1da177e4 LT |
1598 | INIT_LIST_HEAD(&svsk->sk_deferred); |
1599 | INIT_LIST_HEAD(&svsk->sk_ready); | |
57b47a53 | 1600 | mutex_init(&svsk->sk_mutex); |
1da177e4 LT |
1601 | |
1602 | /* Initialize the socket */ | |
1603 | if (sock->type == SOCK_DGRAM) | |
1604 | svc_udp_init(svsk); | |
1605 | else | |
1606 | svc_tcp_init(svsk); | |
1607 | ||
1608 | spin_lock_bh(&serv->sv_lock); | |
6b174337 | 1609 | if (is_temporary) { |
1da177e4 LT |
1610 | set_bit(SK_TEMP, &svsk->sk_flags); |
1611 | list_add(&svsk->sk_list, &serv->sv_tempsocks); | |
1612 | serv->sv_tmpcnt++; | |
36bdfc8b GB |
1613 | if (serv->sv_temptimer.function == NULL) { |
1614 | /* setup timer to age temp sockets */ | |
1615 | setup_timer(&serv->sv_temptimer, svc_age_temp_sockets, | |
1616 | (unsigned long)serv); | |
1617 | mod_timer(&serv->sv_temptimer, | |
1618 | jiffies + svc_conn_age_period * HZ); | |
1619 | } | |
1da177e4 LT |
1620 | } else { |
1621 | clear_bit(SK_TEMP, &svsk->sk_flags); | |
1622 | list_add(&svsk->sk_list, &serv->sv_permsocks); | |
1623 | } | |
1624 | spin_unlock_bh(&serv->sv_lock); | |
1625 | ||
1626 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", | |
1627 | svsk, svsk->sk_sk); | |
1628 | ||
1da177e4 LT |
1629 | return svsk; |
1630 | } | |
1631 | ||
b41b66d6 N |
1632 | int svc_addsock(struct svc_serv *serv, |
1633 | int fd, | |
1634 | char *name_return, | |
1635 | int *proto) | |
1636 | { | |
1637 | int err = 0; | |
1638 | struct socket *so = sockfd_lookup(fd, &err); | |
1639 | struct svc_sock *svsk = NULL; | |
1640 | ||
1641 | if (!so) | |
1642 | return err; | |
1643 | if (so->sk->sk_family != AF_INET) | |
1644 | err = -EAFNOSUPPORT; | |
1645 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1646 | so->sk->sk_protocol != IPPROTO_UDP) | |
1647 | err = -EPROTONOSUPPORT; | |
1648 | else if (so->state > SS_UNCONNECTED) | |
1649 | err = -EISCONN; | |
1650 | else { | |
6b174337 | 1651 | svsk = svc_setup_socket(serv, so, &err, SVC_SOCK_DEFAULTS); |
e79eff1f N |
1652 | if (svsk) { |
1653 | svc_sock_received(svsk); | |
b41b66d6 | 1654 | err = 0; |
e79eff1f | 1655 | } |
b41b66d6 N |
1656 | } |
1657 | if (err) { | |
1658 | sockfd_put(so); | |
1659 | return err; | |
1660 | } | |
1661 | if (proto) *proto = so->sk->sk_protocol; | |
1662 | return one_sock_name(name_return, svsk); | |
1663 | } | |
1664 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1665 | ||
1da177e4 LT |
1666 | /* |
1667 | * Create socket for RPC service. | |
1668 | */ | |
6b174337 CL |
1669 | static int svc_create_socket(struct svc_serv *serv, int protocol, |
1670 | struct sockaddr_in *sin, int flags) | |
1da177e4 LT |
1671 | { |
1672 | struct svc_sock *svsk; | |
1673 | struct socket *sock; | |
1674 | int error; | |
1675 | int type; | |
ad06e4bd | 1676 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 | 1677 | |
ad06e4bd CL |
1678 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1679 | serv->sv_program->pg_name, protocol, | |
1680 | __svc_print_addr((struct sockaddr *) sin, buf, | |
1681 | sizeof(buf))); | |
1da177e4 LT |
1682 | |
1683 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1684 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1685 | "sockets supported\n"); | |
1686 | return -EINVAL; | |
1687 | } | |
1688 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; | |
1689 | ||
1690 | if ((error = sock_create_kern(PF_INET, type, protocol, &sock)) < 0) | |
1691 | return error; | |
1692 | ||
ed07536e PZ |
1693 | svc_reclassify_socket(sock); |
1694 | ||
18114746 ES |
1695 | if (type == SOCK_STREAM) |
1696 | sock->sk->sk_reuse = 1; /* allow address reuse */ | |
1697 | error = kernel_bind(sock, (struct sockaddr *) sin, | |
1698 | sizeof(*sin)); | |
1699 | if (error < 0) | |
1700 | goto bummer; | |
1da177e4 LT |
1701 | |
1702 | if (protocol == IPPROTO_TCP) { | |
e6242e92 | 1703 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1704 | goto bummer; |
1705 | } | |
1706 | ||
e79eff1f N |
1707 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
1708 | svc_sock_received(svsk); | |
6b174337 | 1709 | return ntohs(inet_sk(svsk->sk_sk)->sport); |
e79eff1f | 1710 | } |
1da177e4 LT |
1711 | |
1712 | bummer: | |
1713 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1714 | sock_release(sock); | |
1715 | return error; | |
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * Remove a dead socket | |
1720 | */ | |
aaf68cfb | 1721 | static void |
1da177e4 LT |
1722 | svc_delete_socket(struct svc_sock *svsk) |
1723 | { | |
1724 | struct svc_serv *serv; | |
1725 | struct sock *sk; | |
1726 | ||
1727 | dprintk("svc: svc_delete_socket(%p)\n", svsk); | |
1728 | ||
1729 | serv = svsk->sk_server; | |
1730 | sk = svsk->sk_sk; | |
1731 | ||
1732 | sk->sk_state_change = svsk->sk_ostate; | |
1733 | sk->sk_data_ready = svsk->sk_odata; | |
1734 | sk->sk_write_space = svsk->sk_owspace; | |
1735 | ||
1736 | spin_lock_bh(&serv->sv_lock); | |
1737 | ||
36bdfc8b GB |
1738 | if (!test_and_set_bit(SK_DETACHED, &svsk->sk_flags)) |
1739 | list_del_init(&svsk->sk_list); | |
cca5172a | 1740 | /* |
3262c816 GB |
1741 | * We used to delete the svc_sock from whichever list |
1742 | * it's sk_ready node was on, but we don't actually | |
1743 | * need to. This is because the only time we're called | |
1744 | * while still attached to a queue, the queue itself | |
1745 | * is about to be destroyed (in svc_destroy). | |
1746 | */ | |
aaf68cfb N |
1747 | if (!test_and_set_bit(SK_DEAD, &svsk->sk_flags)) { |
1748 | BUG_ON(atomic_read(&svsk->sk_inuse)<2); | |
1749 | atomic_dec(&svsk->sk_inuse); | |
1da177e4 LT |
1750 | if (test_bit(SK_TEMP, &svsk->sk_flags)) |
1751 | serv->sv_tmpcnt--; | |
aaf68cfb | 1752 | } |
1da177e4 | 1753 | |
d6740df9 | 1754 | spin_unlock_bh(&serv->sv_lock); |
aaf68cfb N |
1755 | } |
1756 | ||
1757 | void svc_close_socket(struct svc_sock *svsk) | |
1758 | { | |
1759 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
1760 | if (test_and_set_bit(SK_BUSY, &svsk->sk_flags)) | |
1761 | /* someone else will have to effect the close */ | |
1762 | return; | |
1763 | ||
1764 | atomic_inc(&svsk->sk_inuse); | |
1765 | svc_delete_socket(svsk); | |
1766 | clear_bit(SK_BUSY, &svsk->sk_flags); | |
d6740df9 | 1767 | svc_sock_put(svsk); |
1da177e4 LT |
1768 | } |
1769 | ||
6b174337 CL |
1770 | /** |
1771 | * svc_makesock - Make a socket for nfsd and lockd | |
1772 | * @serv: RPC server structure | |
1773 | * @protocol: transport protocol to use | |
1774 | * @port: port to use | |
482fb94e | 1775 | * @flags: requested socket characteristics |
6b174337 | 1776 | * |
1da177e4 | 1777 | */ |
482fb94e CL |
1778 | int svc_makesock(struct svc_serv *serv, int protocol, unsigned short port, |
1779 | int flags) | |
1da177e4 | 1780 | { |
6b174337 CL |
1781 | struct sockaddr_in sin = { |
1782 | .sin_family = AF_INET, | |
1783 | .sin_addr.s_addr = INADDR_ANY, | |
1784 | .sin_port = htons(port), | |
1785 | }; | |
1da177e4 LT |
1786 | |
1787 | dprintk("svc: creating socket proto = %d\n", protocol); | |
482fb94e | 1788 | return svc_create_socket(serv, protocol, &sin, flags); |
1da177e4 LT |
1789 | } |
1790 | ||
1791 | /* | |
cca5172a | 1792 | * Handle defer and revisit of requests |
1da177e4 LT |
1793 | */ |
1794 | ||
1795 | static void svc_revisit(struct cache_deferred_req *dreq, int too_many) | |
1796 | { | |
1797 | struct svc_deferred_req *dr = container_of(dreq, struct svc_deferred_req, handle); | |
1da177e4 LT |
1798 | struct svc_sock *svsk; |
1799 | ||
1800 | if (too_many) { | |
1801 | svc_sock_put(dr->svsk); | |
1802 | kfree(dr); | |
1803 | return; | |
1804 | } | |
1805 | dprintk("revisit queued\n"); | |
1806 | svsk = dr->svsk; | |
1807 | dr->svsk = NULL; | |
1a68d952 | 1808 | spin_lock_bh(&svsk->sk_defer_lock); |
1da177e4 | 1809 | list_add(&dr->handle.recent, &svsk->sk_deferred); |
1a68d952 | 1810 | spin_unlock_bh(&svsk->sk_defer_lock); |
1da177e4 LT |
1811 | set_bit(SK_DEFERRED, &svsk->sk_flags); |
1812 | svc_sock_enqueue(svsk); | |
1813 | svc_sock_put(svsk); | |
1814 | } | |
1815 | ||
1816 | static struct cache_deferred_req * | |
1817 | svc_defer(struct cache_req *req) | |
1818 | { | |
1819 | struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); | |
1820 | int size = sizeof(struct svc_deferred_req) + (rqstp->rq_arg.len); | |
1821 | struct svc_deferred_req *dr; | |
1822 | ||
1823 | if (rqstp->rq_arg.page_len) | |
1824 | return NULL; /* if more than a page, give up FIXME */ | |
1825 | if (rqstp->rq_deferred) { | |
1826 | dr = rqstp->rq_deferred; | |
1827 | rqstp->rq_deferred = NULL; | |
1828 | } else { | |
1829 | int skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1830 | /* FIXME maybe discard if size too large */ | |
1831 | dr = kmalloc(size, GFP_KERNEL); | |
1832 | if (dr == NULL) | |
1833 | return NULL; | |
1834 | ||
1835 | dr->handle.owner = rqstp->rq_server; | |
1836 | dr->prot = rqstp->rq_prot; | |
24422222 CL |
1837 | memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); |
1838 | dr->addrlen = rqstp->rq_addrlen; | |
1918e341 | 1839 | dr->daddr = rqstp->rq_daddr; |
1da177e4 LT |
1840 | dr->argslen = rqstp->rq_arg.len >> 2; |
1841 | memcpy(dr->args, rqstp->rq_arg.head[0].iov_base-skip, dr->argslen<<2); | |
1842 | } | |
c45c357d | 1843 | atomic_inc(&rqstp->rq_sock->sk_inuse); |
1da177e4 | 1844 | dr->svsk = rqstp->rq_sock; |
1da177e4 LT |
1845 | |
1846 | dr->handle.revisit = svc_revisit; | |
1847 | return &dr->handle; | |
1848 | } | |
1849 | ||
1850 | /* | |
1851 | * recv data from a deferred request into an active one | |
1852 | */ | |
1853 | static int svc_deferred_recv(struct svc_rqst *rqstp) | |
1854 | { | |
1855 | struct svc_deferred_req *dr = rqstp->rq_deferred; | |
1856 | ||
1857 | rqstp->rq_arg.head[0].iov_base = dr->args; | |
1858 | rqstp->rq_arg.head[0].iov_len = dr->argslen<<2; | |
1859 | rqstp->rq_arg.page_len = 0; | |
1860 | rqstp->rq_arg.len = dr->argslen<<2; | |
1861 | rqstp->rq_prot = dr->prot; | |
24422222 CL |
1862 | memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); |
1863 | rqstp->rq_addrlen = dr->addrlen; | |
1918e341 | 1864 | rqstp->rq_daddr = dr->daddr; |
44524359 | 1865 | rqstp->rq_respages = rqstp->rq_pages; |
1da177e4 LT |
1866 | return dr->argslen<<2; |
1867 | } | |
1868 | ||
1869 | ||
1870 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk) | |
1871 | { | |
1872 | struct svc_deferred_req *dr = NULL; | |
cca5172a | 1873 | |
1da177e4 LT |
1874 | if (!test_bit(SK_DEFERRED, &svsk->sk_flags)) |
1875 | return NULL; | |
1a68d952 | 1876 | spin_lock_bh(&svsk->sk_defer_lock); |
1da177e4 LT |
1877 | clear_bit(SK_DEFERRED, &svsk->sk_flags); |
1878 | if (!list_empty(&svsk->sk_deferred)) { | |
1879 | dr = list_entry(svsk->sk_deferred.next, | |
1880 | struct svc_deferred_req, | |
1881 | handle.recent); | |
1882 | list_del_init(&dr->handle.recent); | |
1883 | set_bit(SK_DEFERRED, &svsk->sk_flags); | |
1884 | } | |
1a68d952 | 1885 | spin_unlock_bh(&svsk->sk_defer_lock); |
1da177e4 LT |
1886 | return dr; |
1887 | } |