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