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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 | ||
172589cc | 22 | #include <linux/kernel.h> |
1da177e4 LT |
23 | #include <linux/sched.h> |
24 | #include <linux/errno.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/inet.h> | |
29 | #include <linux/udp.h> | |
91483c4b | 30 | #include <linux/tcp.h> |
1da177e4 LT |
31 | #include <linux/unistd.h> |
32 | #include <linux/slab.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/skbuff.h> | |
b41b66d6 | 35 | #include <linux/file.h> |
7dfb7103 | 36 | #include <linux/freezer.h> |
1da177e4 LT |
37 | #include <net/sock.h> |
38 | #include <net/checksum.h> | |
39 | #include <net/ip.h> | |
b92503b2 | 40 | #include <net/ipv6.h> |
c752f073 | 41 | #include <net/tcp_states.h> |
1da177e4 LT |
42 | #include <asm/uaccess.h> |
43 | #include <asm/ioctls.h> | |
44 | ||
45 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 46 | #include <linux/sunrpc/clnt.h> |
1da177e4 LT |
47 | #include <linux/sunrpc/xdr.h> |
48 | #include <linux/sunrpc/svcsock.h> | |
49 | #include <linux/sunrpc/stats.h> | |
50 | ||
51 | /* SMP locking strategy: | |
52 | * | |
3262c816 GB |
53 | * svc_pool->sp_lock protects most of the fields of that pool. |
54 | * svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt. | |
55 | * when both need to be taken (rare), svc_serv->sv_lock is first. | |
56 | * BKL protects svc_serv->sv_nrthread. | |
7ac1bea5 N |
57 | * svc_sock->sk_lock protects the svc_sock->sk_deferred list |
58 | * and the ->sk_info_authunix cache. | |
c081a0c7 | 59 | * svc_sock->sk_flags.SK_BUSY prevents a svc_sock being enqueued multiply. |
1da177e4 LT |
60 | * |
61 | * Some flags can be set to certain values at any time | |
62 | * providing that certain rules are followed: | |
63 | * | |
1da177e4 | 64 | * SK_CONN, SK_DATA, can be set or cleared at any time. |
cca5172a | 65 | * after a set, svc_sock_enqueue must be called. |
1da177e4 LT |
66 | * after a clear, the socket must be read/accepted |
67 | * if this succeeds, it must be set again. | |
68 | * SK_CLOSE can set at any time. It is never cleared. | |
e1b3157f TT |
69 | * xpt_ref contains a bias of '1' until SK_DEAD is set. |
70 | * so when xprt_ref hits zero, we know the transport is dead | |
aaf68cfb N |
71 | * and no-one is using it. |
72 | * SK_DEAD can only be set while SK_BUSY is held which ensures | |
73 | * no other thread will be using the socket or will try to | |
74 | * set SK_DEAD. | |
1da177e4 LT |
75 | * |
76 | */ | |
77 | ||
360d8738 | 78 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
79 | |
80 | ||
81 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 82 | int *errp, int flags); |
aaf68cfb | 83 | static void svc_delete_socket(struct svc_sock *svsk); |
1da177e4 LT |
84 | static void svc_udp_data_ready(struct sock *, int); |
85 | static int svc_udp_recvfrom(struct svc_rqst *); | |
86 | static int svc_udp_sendto(struct svc_rqst *); | |
cda1fd4a | 87 | static void svc_close_socket(struct svc_sock *svsk); |
755cceab TT |
88 | static void svc_sock_detach(struct svc_xprt *); |
89 | static void svc_sock_free(struct svc_xprt *); | |
1da177e4 LT |
90 | |
91 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk); | |
92 | static int svc_deferred_recv(struct svc_rqst *rqstp); | |
93 | static struct cache_deferred_req *svc_defer(struct cache_req *req); | |
b700cbb1 TT |
94 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
95 | struct sockaddr *, int, int); | |
1da177e4 | 96 | |
36bdfc8b GB |
97 | /* apparently the "standard" is that clients close |
98 | * idle connections after 5 minutes, servers after | |
99 | * 6 minutes | |
100 | * http://www.connectathon.org/talks96/nfstcp.pdf | |
101 | */ | |
102 | static int svc_conn_age_period = 6*60; | |
103 | ||
ed07536e PZ |
104 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
105 | static struct lock_class_key svc_key[2]; | |
106 | static struct lock_class_key svc_slock_key[2]; | |
107 | ||
108 | static inline void svc_reclassify_socket(struct socket *sock) | |
109 | { | |
110 | struct sock *sk = sock->sk; | |
02b3d346 | 111 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
112 | switch (sk->sk_family) { |
113 | case AF_INET: | |
114 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
115 | &svc_slock_key[0], "sk_lock-AF_INET-NFSD", &svc_key[0]); | |
116 | break; | |
117 | ||
118 | case AF_INET6: | |
119 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
120 | &svc_slock_key[1], "sk_lock-AF_INET6-NFSD", &svc_key[1]); | |
121 | break; | |
122 | ||
123 | default: | |
124 | BUG(); | |
125 | } | |
126 | } | |
127 | #else | |
128 | static inline void svc_reclassify_socket(struct socket *sock) | |
129 | { | |
130 | } | |
131 | #endif | |
132 | ||
ad06e4bd CL |
133 | static char *__svc_print_addr(struct sockaddr *addr, char *buf, size_t len) |
134 | { | |
135 | switch (addr->sa_family) { | |
136 | case AF_INET: | |
137 | snprintf(buf, len, "%u.%u.%u.%u, port=%u", | |
138 | NIPQUAD(((struct sockaddr_in *) addr)->sin_addr), | |
582ee43d | 139 | ntohs(((struct sockaddr_in *) addr)->sin_port)); |
ad06e4bd | 140 | break; |
5a05ed73 | 141 | |
ad06e4bd CL |
142 | case AF_INET6: |
143 | snprintf(buf, len, "%x:%x:%x:%x:%x:%x:%x:%x, port=%u", | |
144 | NIP6(((struct sockaddr_in6 *) addr)->sin6_addr), | |
582ee43d | 145 | ntohs(((struct sockaddr_in6 *) addr)->sin6_port)); |
ad06e4bd | 146 | break; |
5a05ed73 | 147 | |
ad06e4bd CL |
148 | default: |
149 | snprintf(buf, len, "unknown address type: %d", addr->sa_family); | |
150 | break; | |
151 | } | |
152 | return buf; | |
153 | } | |
154 | ||
155 | /** | |
156 | * svc_print_addr - Format rq_addr field for printing | |
157 | * @rqstp: svc_rqst struct containing address to print | |
158 | * @buf: target buffer for formatted address | |
159 | * @len: length of target buffer | |
160 | * | |
161 | */ | |
162 | char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) | |
163 | { | |
27459f09 | 164 | return __svc_print_addr(svc_addr(rqstp), buf, len); |
ad06e4bd CL |
165 | } |
166 | EXPORT_SYMBOL_GPL(svc_print_addr); | |
167 | ||
1da177e4 | 168 | /* |
3262c816 | 169 | * Queue up an idle server thread. Must have pool->sp_lock held. |
1da177e4 | 170 | * Note: this is really a stack rather than a queue, so that we only |
3262c816 | 171 | * use as many different threads as we need, and the rest don't pollute |
1da177e4 LT |
172 | * the cache. |
173 | */ | |
174 | static inline void | |
3262c816 | 175 | svc_thread_enqueue(struct svc_pool *pool, struct svc_rqst *rqstp) |
1da177e4 | 176 | { |
3262c816 | 177 | list_add(&rqstp->rq_list, &pool->sp_threads); |
1da177e4 LT |
178 | } |
179 | ||
180 | /* | |
3262c816 | 181 | * Dequeue an nfsd thread. Must have pool->sp_lock held. |
1da177e4 LT |
182 | */ |
183 | static inline void | |
3262c816 | 184 | svc_thread_dequeue(struct svc_pool *pool, struct svc_rqst *rqstp) |
1da177e4 LT |
185 | { |
186 | list_del(&rqstp->rq_list); | |
187 | } | |
188 | ||
189 | /* | |
190 | * Release an skbuff after use | |
191 | */ | |
5148bf4e | 192 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 193 | { |
5148bf4e | 194 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
195 | struct svc_deferred_req *dr = rqstp->rq_deferred; |
196 | ||
197 | if (skb) { | |
5148bf4e | 198 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
199 | |
200 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
201 | skb_free_datagram(rqstp->rq_sock->sk_sk, skb); | |
202 | } | |
203 | if (dr) { | |
204 | rqstp->rq_deferred = NULL; | |
205 | kfree(dr); | |
206 | } | |
207 | } | |
208 | ||
1da177e4 LT |
209 | /* |
210 | * Queue up a socket with data pending. If there are idle nfsd | |
211 | * processes, wake 'em up. | |
212 | * | |
213 | */ | |
214 | static void | |
215 | svc_sock_enqueue(struct svc_sock *svsk) | |
216 | { | |
217 | struct svc_serv *serv = svsk->sk_server; | |
bfd24160 | 218 | struct svc_pool *pool; |
1da177e4 | 219 | struct svc_rqst *rqstp; |
bfd24160 | 220 | int cpu; |
1da177e4 LT |
221 | |
222 | if (!(svsk->sk_flags & | |
223 | ( (1<<SK_CONN)|(1<<SK_DATA)|(1<<SK_CLOSE)|(1<<SK_DEFERRED)) )) | |
224 | return; | |
225 | if (test_bit(SK_DEAD, &svsk->sk_flags)) | |
226 | return; | |
227 | ||
bfd24160 GB |
228 | cpu = get_cpu(); |
229 | pool = svc_pool_for_cpu(svsk->sk_server, cpu); | |
230 | put_cpu(); | |
231 | ||
3262c816 | 232 | spin_lock_bh(&pool->sp_lock); |
1da177e4 | 233 | |
3262c816 GB |
234 | if (!list_empty(&pool->sp_threads) && |
235 | !list_empty(&pool->sp_sockets)) | |
1da177e4 LT |
236 | printk(KERN_ERR |
237 | "svc_sock_enqueue: threads and sockets both waiting??\n"); | |
238 | ||
239 | if (test_bit(SK_DEAD, &svsk->sk_flags)) { | |
240 | /* Don't enqueue dead sockets */ | |
241 | dprintk("svc: socket %p is dead, not enqueued\n", svsk->sk_sk); | |
242 | goto out_unlock; | |
243 | } | |
244 | ||
c081a0c7 GB |
245 | /* Mark socket as busy. It will remain in this state until the |
246 | * server has processed all pending data and put the socket back | |
247 | * on the idle list. We update SK_BUSY atomically because | |
248 | * it also guards against trying to enqueue the svc_sock twice. | |
249 | */ | |
250 | if (test_and_set_bit(SK_BUSY, &svsk->sk_flags)) { | |
251 | /* Don't enqueue socket while already enqueued */ | |
1da177e4 LT |
252 | dprintk("svc: socket %p busy, not enqueued\n", svsk->sk_sk); |
253 | goto out_unlock; | |
254 | } | |
3262c816 GB |
255 | BUG_ON(svsk->sk_pool != NULL); |
256 | svsk->sk_pool = pool; | |
1da177e4 | 257 | |
323bee32 TT |
258 | /* Handle pending connection */ |
259 | if (test_bit(SK_CONN, &svsk->sk_flags)) | |
260 | goto process; | |
261 | ||
262 | /* Handle close in-progress */ | |
263 | if (test_bit(SK_CLOSE, &svsk->sk_flags)) | |
264 | goto process; | |
265 | ||
266 | /* Check if we have space to reply to a request */ | |
267 | if (!svsk->sk_xprt.xpt_ops->xpo_has_wspace(&svsk->sk_xprt)) { | |
1da177e4 | 268 | /* Don't enqueue while not enough space for reply */ |
323bee32 | 269 | dprintk("svc: no write space, socket %p not enqueued\n", svsk); |
3262c816 | 270 | svsk->sk_pool = NULL; |
c081a0c7 | 271 | clear_bit(SK_BUSY, &svsk->sk_flags); |
1da177e4 LT |
272 | goto out_unlock; |
273 | } | |
1da177e4 | 274 | |
323bee32 | 275 | process: |
3262c816 GB |
276 | if (!list_empty(&pool->sp_threads)) { |
277 | rqstp = list_entry(pool->sp_threads.next, | |
1da177e4 LT |
278 | struct svc_rqst, |
279 | rq_list); | |
280 | dprintk("svc: socket %p served by daemon %p\n", | |
281 | svsk->sk_sk, rqstp); | |
3262c816 | 282 | svc_thread_dequeue(pool, rqstp); |
1da177e4 | 283 | if (rqstp->rq_sock) |
cca5172a | 284 | printk(KERN_ERR |
1da177e4 LT |
285 | "svc_sock_enqueue: server %p, rq_sock=%p!\n", |
286 | rqstp, rqstp->rq_sock); | |
287 | rqstp->rq_sock = svsk; | |
e1b3157f | 288 | svc_xprt_get(&svsk->sk_xprt); |
c6b0a9f8 | 289 | rqstp->rq_reserved = serv->sv_max_mesg; |
5685f0fa | 290 | atomic_add(rqstp->rq_reserved, &svsk->sk_reserved); |
3262c816 | 291 | BUG_ON(svsk->sk_pool != pool); |
1da177e4 LT |
292 | wake_up(&rqstp->rq_wait); |
293 | } else { | |
294 | dprintk("svc: socket %p put into queue\n", svsk->sk_sk); | |
3262c816 GB |
295 | list_add_tail(&svsk->sk_ready, &pool->sp_sockets); |
296 | BUG_ON(svsk->sk_pool != pool); | |
1da177e4 LT |
297 | } |
298 | ||
299 | out_unlock: | |
3262c816 | 300 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 LT |
301 | } |
302 | ||
303 | /* | |
3262c816 | 304 | * Dequeue the first socket. Must be called with the pool->sp_lock held. |
1da177e4 LT |
305 | */ |
306 | static inline struct svc_sock * | |
3262c816 | 307 | svc_sock_dequeue(struct svc_pool *pool) |
1da177e4 LT |
308 | { |
309 | struct svc_sock *svsk; | |
310 | ||
3262c816 | 311 | if (list_empty(&pool->sp_sockets)) |
1da177e4 LT |
312 | return NULL; |
313 | ||
3262c816 | 314 | svsk = list_entry(pool->sp_sockets.next, |
1da177e4 LT |
315 | struct svc_sock, sk_ready); |
316 | list_del_init(&svsk->sk_ready); | |
317 | ||
318 | dprintk("svc: socket %p dequeued, inuse=%d\n", | |
e1b3157f | 319 | svsk->sk_sk, atomic_read(&svsk->sk_xprt.xpt_ref.refcount)); |
1da177e4 LT |
320 | |
321 | return svsk; | |
322 | } | |
323 | ||
324 | /* | |
325 | * Having read something from a socket, check whether it | |
326 | * needs to be re-enqueued. | |
327 | * Note: SK_DATA only gets cleared when a read-attempt finds | |
328 | * no (or insufficient) data. | |
329 | */ | |
330 | static inline void | |
331 | svc_sock_received(struct svc_sock *svsk) | |
332 | { | |
3262c816 | 333 | svsk->sk_pool = NULL; |
1da177e4 LT |
334 | clear_bit(SK_BUSY, &svsk->sk_flags); |
335 | svc_sock_enqueue(svsk); | |
336 | } | |
337 | ||
338 | ||
339 | /** | |
340 | * svc_reserve - change the space reserved for the reply to a request. | |
341 | * @rqstp: The request in question | |
342 | * @space: new max space to reserve | |
343 | * | |
344 | * Each request reserves some space on the output queue of the socket | |
345 | * to make sure the reply fits. This function reduces that reserved | |
346 | * space to be the amount of space used already, plus @space. | |
347 | * | |
348 | */ | |
349 | void svc_reserve(struct svc_rqst *rqstp, int space) | |
350 | { | |
351 | space += rqstp->rq_res.head[0].iov_len; | |
352 | ||
353 | if (space < rqstp->rq_reserved) { | |
354 | struct svc_sock *svsk = rqstp->rq_sock; | |
5685f0fa | 355 | atomic_sub((rqstp->rq_reserved - space), &svsk->sk_reserved); |
1da177e4 | 356 | rqstp->rq_reserved = space; |
1da177e4 LT |
357 | |
358 | svc_sock_enqueue(svsk); | |
359 | } | |
360 | } | |
361 | ||
1da177e4 LT |
362 | static void |
363 | svc_sock_release(struct svc_rqst *rqstp) | |
364 | { | |
365 | struct svc_sock *svsk = rqstp->rq_sock; | |
366 | ||
5148bf4e | 367 | rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); |
1da177e4 | 368 | |
44524359 | 369 | svc_free_res_pages(rqstp); |
1da177e4 LT |
370 | rqstp->rq_res.page_len = 0; |
371 | rqstp->rq_res.page_base = 0; | |
372 | ||
373 | ||
374 | /* Reset response buffer and release | |
375 | * the reservation. | |
376 | * But first, check that enough space was reserved | |
377 | * for the reply, otherwise we have a bug! | |
378 | */ | |
379 | if ((rqstp->rq_res.len) > rqstp->rq_reserved) | |
380 | printk(KERN_ERR "RPC request reserved %d but used %d\n", | |
381 | rqstp->rq_reserved, | |
382 | rqstp->rq_res.len); | |
383 | ||
384 | rqstp->rq_res.head[0].iov_len = 0; | |
385 | svc_reserve(rqstp, 0); | |
386 | rqstp->rq_sock = NULL; | |
387 | ||
e1b3157f | 388 | svc_xprt_put(&svsk->sk_xprt); |
1da177e4 LT |
389 | } |
390 | ||
391 | /* | |
392 | * External function to wake up a server waiting for data | |
3262c816 GB |
393 | * This really only makes sense for services like lockd |
394 | * which have exactly one thread anyway. | |
1da177e4 LT |
395 | */ |
396 | void | |
397 | svc_wake_up(struct svc_serv *serv) | |
398 | { | |
399 | struct svc_rqst *rqstp; | |
3262c816 GB |
400 | unsigned int i; |
401 | struct svc_pool *pool; | |
402 | ||
403 | for (i = 0; i < serv->sv_nrpools; i++) { | |
404 | pool = &serv->sv_pools[i]; | |
405 | ||
406 | spin_lock_bh(&pool->sp_lock); | |
407 | if (!list_empty(&pool->sp_threads)) { | |
408 | rqstp = list_entry(pool->sp_threads.next, | |
409 | struct svc_rqst, | |
410 | rq_list); | |
411 | dprintk("svc: daemon %p woken up.\n", rqstp); | |
412 | /* | |
413 | svc_thread_dequeue(pool, rqstp); | |
414 | rqstp->rq_sock = NULL; | |
415 | */ | |
416 | wake_up(&rqstp->rq_wait); | |
417 | } | |
418 | spin_unlock_bh(&pool->sp_lock); | |
1da177e4 | 419 | } |
1da177e4 LT |
420 | } |
421 | ||
b92503b2 CL |
422 | union svc_pktinfo_u { |
423 | struct in_pktinfo pkti; | |
b92503b2 | 424 | struct in6_pktinfo pkti6; |
b92503b2 | 425 | }; |
bc375ea7 DM |
426 | #define SVC_PKTINFO_SPACE \ |
427 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
428 | |
429 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
430 | { | |
431 | switch (rqstp->rq_sock->sk_sk->sk_family) { | |
432 | case AF_INET: { | |
433 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
434 | ||
435 | cmh->cmsg_level = SOL_IP; | |
436 | cmh->cmsg_type = IP_PKTINFO; | |
437 | pki->ipi_ifindex = 0; | |
438 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
439 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
440 | } | |
441 | break; | |
5a05ed73 | 442 | |
b92503b2 CL |
443 | case AF_INET6: { |
444 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
445 | ||
446 | cmh->cmsg_level = SOL_IPV6; | |
447 | cmh->cmsg_type = IPV6_PKTINFO; | |
448 | pki->ipi6_ifindex = 0; | |
449 | ipv6_addr_copy(&pki->ipi6_addr, | |
450 | &rqstp->rq_daddr.addr6); | |
451 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
452 | } | |
453 | break; | |
b92503b2 CL |
454 | } |
455 | return; | |
456 | } | |
457 | ||
1da177e4 LT |
458 | /* |
459 | * Generic sendto routine | |
460 | */ | |
461 | static int | |
462 | svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
463 | { | |
464 | struct svc_sock *svsk = rqstp->rq_sock; | |
465 | struct socket *sock = svsk->sk_sock; | |
466 | int slen; | |
bc375ea7 DM |
467 | union { |
468 | struct cmsghdr hdr; | |
469 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
470 | } buffer; | |
471 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 LT |
472 | int len = 0; |
473 | int result; | |
474 | int size; | |
475 | struct page **ppage = xdr->pages; | |
476 | size_t base = xdr->page_base; | |
477 | unsigned int pglen = xdr->page_len; | |
478 | unsigned int flags = MSG_MORE; | |
ad06e4bd | 479 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
480 | |
481 | slen = xdr->len; | |
482 | ||
483 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
b92503b2 CL |
484 | struct msghdr msg = { |
485 | .msg_name = &rqstp->rq_addr, | |
486 | .msg_namelen = rqstp->rq_addrlen, | |
487 | .msg_control = cmh, | |
488 | .msg_controllen = sizeof(buffer), | |
489 | .msg_flags = MSG_MORE, | |
490 | }; | |
491 | ||
492 | svc_set_cmsg_data(rqstp, cmh); | |
1da177e4 LT |
493 | |
494 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
495 | goto out; | |
496 | } | |
497 | ||
498 | /* send head */ | |
499 | if (slen == xdr->head[0].iov_len) | |
500 | flags = 0; | |
44524359 N |
501 | len = kernel_sendpage(sock, rqstp->rq_respages[0], 0, |
502 | xdr->head[0].iov_len, flags); | |
1da177e4 LT |
503 | if (len != xdr->head[0].iov_len) |
504 | goto out; | |
505 | slen -= xdr->head[0].iov_len; | |
506 | if (slen == 0) | |
507 | goto out; | |
508 | ||
509 | /* send page data */ | |
510 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
511 | while (pglen > 0) { | |
512 | if (slen == size) | |
513 | flags = 0; | |
e6242e92 | 514 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
515 | if (result > 0) |
516 | len += result; | |
517 | if (result != size) | |
518 | goto out; | |
519 | slen -= size; | |
520 | pglen -= size; | |
521 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
522 | base = 0; | |
523 | ppage++; | |
524 | } | |
525 | /* send tail */ | |
526 | if (xdr->tail[0].iov_len) { | |
44524359 N |
527 | result = kernel_sendpage(sock, rqstp->rq_respages[0], |
528 | ((unsigned long)xdr->tail[0].iov_base) | |
cca5172a | 529 | & (PAGE_SIZE-1), |
1da177e4 LT |
530 | xdr->tail[0].iov_len, 0); |
531 | ||
532 | if (result > 0) | |
533 | len += result; | |
534 | } | |
535 | out: | |
ad06e4bd CL |
536 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
537 | rqstp->rq_sock, xdr->head[0].iov_base, xdr->head[0].iov_len, | |
538 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); | |
1da177e4 LT |
539 | |
540 | return len; | |
541 | } | |
542 | ||
80212d59 N |
543 | /* |
544 | * Report socket names for nfsdfs | |
545 | */ | |
546 | static int one_sock_name(char *buf, struct svc_sock *svsk) | |
547 | { | |
548 | int len; | |
549 | ||
550 | switch(svsk->sk_sk->sk_family) { | |
551 | case AF_INET: | |
552 | len = sprintf(buf, "ipv4 %s %u.%u.%u.%u %d\n", | |
553 | svsk->sk_sk->sk_protocol==IPPROTO_UDP? | |
554 | "udp" : "tcp", | |
555 | NIPQUAD(inet_sk(svsk->sk_sk)->rcv_saddr), | |
556 | inet_sk(svsk->sk_sk)->num); | |
557 | break; | |
558 | default: | |
559 | len = sprintf(buf, "*unknown-%d*\n", | |
560 | svsk->sk_sk->sk_family); | |
561 | } | |
562 | return len; | |
563 | } | |
564 | ||
565 | int | |
b41b66d6 | 566 | svc_sock_names(char *buf, struct svc_serv *serv, char *toclose) |
80212d59 | 567 | { |
b41b66d6 | 568 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
569 | int len = 0; |
570 | ||
571 | if (!serv) | |
572 | return 0; | |
aaf68cfb | 573 | spin_lock_bh(&serv->sv_lock); |
80212d59 N |
574 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_list) { |
575 | int onelen = one_sock_name(buf+len, svsk); | |
b41b66d6 N |
576 | if (toclose && strcmp(toclose, buf+len) == 0) |
577 | closesk = svsk; | |
578 | else | |
579 | len += onelen; | |
80212d59 | 580 | } |
aaf68cfb | 581 | spin_unlock_bh(&serv->sv_lock); |
b41b66d6 | 582 | if (closesk) |
5680c446 N |
583 | /* Should unregister with portmap, but you cannot |
584 | * unregister just one protocol... | |
585 | */ | |
aaf68cfb | 586 | svc_close_socket(closesk); |
37a03472 N |
587 | else if (toclose) |
588 | return -ENOENT; | |
80212d59 N |
589 | return len; |
590 | } | |
591 | EXPORT_SYMBOL(svc_sock_names); | |
592 | ||
1da177e4 LT |
593 | /* |
594 | * Check input queue length | |
595 | */ | |
596 | static int | |
597 | svc_recv_available(struct svc_sock *svsk) | |
598 | { | |
1da177e4 LT |
599 | struct socket *sock = svsk->sk_sock; |
600 | int avail, err; | |
601 | ||
e6242e92 | 602 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
603 | |
604 | return (err >= 0)? avail : err; | |
605 | } | |
606 | ||
607 | /* | |
608 | * Generic recvfrom routine. | |
609 | */ | |
610 | static int | |
611 | svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, int buflen) | |
612 | { | |
067d7817 | 613 | struct svc_sock *svsk = rqstp->rq_sock; |
1ba95105 CL |
614 | struct msghdr msg = { |
615 | .msg_flags = MSG_DONTWAIT, | |
616 | }; | |
a9747692 | 617 | struct sockaddr *sin; |
1ba95105 | 618 | int len; |
1da177e4 | 619 | |
1ba95105 CL |
620 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
621 | msg.msg_flags); | |
1da177e4 LT |
622 | |
623 | /* sock_recvmsg doesn't fill in the name/namelen, so we must.. | |
1da177e4 | 624 | */ |
067d7817 CL |
625 | memcpy(&rqstp->rq_addr, &svsk->sk_remote, svsk->sk_remotelen); |
626 | rqstp->rq_addrlen = svsk->sk_remotelen; | |
1da177e4 | 627 | |
a9747692 FM |
628 | /* Destination address in request is needed for binding the |
629 | * source address in RPC callbacks later. | |
630 | */ | |
631 | sin = (struct sockaddr *)&svsk->sk_local; | |
632 | switch (sin->sa_family) { | |
633 | case AF_INET: | |
634 | rqstp->rq_daddr.addr = ((struct sockaddr_in *)sin)->sin_addr; | |
635 | break; | |
636 | case AF_INET6: | |
637 | rqstp->rq_daddr.addr6 = ((struct sockaddr_in6 *)sin)->sin6_addr; | |
638 | break; | |
639 | } | |
640 | ||
1da177e4 | 641 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 642 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
643 | |
644 | return len; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Set socket snd and rcv buffer lengths | |
649 | */ | |
650 | static inline void | |
651 | svc_sock_setbufsize(struct socket *sock, unsigned int snd, unsigned int rcv) | |
652 | { | |
653 | #if 0 | |
654 | mm_segment_t oldfs; | |
655 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
656 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
657 | (char*)&snd, sizeof(snd)); | |
658 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
659 | (char*)&rcv, sizeof(rcv)); | |
660 | #else | |
661 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
662 | * which isn't acceptable. Until that is made conditional | |
663 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
664 | * DaveM said I could! | |
665 | */ | |
666 | lock_sock(sock->sk); | |
667 | sock->sk->sk_sndbuf = snd * 2; | |
668 | sock->sk->sk_rcvbuf = rcv * 2; | |
669 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; | |
670 | release_sock(sock->sk); | |
671 | #endif | |
672 | } | |
673 | /* | |
674 | * INET callback when data has been received on the socket. | |
675 | */ | |
676 | static void | |
677 | svc_udp_data_ready(struct sock *sk, int count) | |
678 | { | |
939bb7ef | 679 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 680 | |
939bb7ef NB |
681 | if (svsk) { |
682 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
683 | svsk, sk, count, test_bit(SK_BUSY, &svsk->sk_flags)); | |
684 | set_bit(SK_DATA, &svsk->sk_flags); | |
685 | svc_sock_enqueue(svsk); | |
686 | } | |
1da177e4 LT |
687 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
688 | wake_up_interruptible(sk->sk_sleep); | |
689 | } | |
690 | ||
691 | /* | |
692 | * INET callback when space is newly available on the socket. | |
693 | */ | |
694 | static void | |
695 | svc_write_space(struct sock *sk) | |
696 | { | |
697 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
698 | ||
699 | if (svsk) { | |
700 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
701 | svsk, sk, test_bit(SK_BUSY, &svsk->sk_flags)); | |
702 | svc_sock_enqueue(svsk); | |
703 | } | |
704 | ||
705 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) { | |
939bb7ef | 706 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 LT |
707 | svsk); |
708 | wake_up_interruptible(sk->sk_sleep); | |
709 | } | |
710 | } | |
711 | ||
7a37f578 N |
712 | static inline void svc_udp_get_dest_address(struct svc_rqst *rqstp, |
713 | struct cmsghdr *cmh) | |
95756482 CL |
714 | { |
715 | switch (rqstp->rq_sock->sk_sk->sk_family) { | |
716 | case AF_INET: { | |
7a37f578 N |
717 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
718 | rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; | |
95756482 | 719 | break; |
7a37f578 | 720 | } |
95756482 | 721 | case AF_INET6: { |
7a37f578 N |
722 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
723 | ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); | |
95756482 | 724 | break; |
7a37f578 | 725 | } |
95756482 | 726 | } |
95756482 CL |
727 | } |
728 | ||
1da177e4 LT |
729 | /* |
730 | * Receive a datagram from a UDP socket. | |
731 | */ | |
1da177e4 LT |
732 | static int |
733 | svc_udp_recvfrom(struct svc_rqst *rqstp) | |
734 | { | |
735 | struct svc_sock *svsk = rqstp->rq_sock; | |
736 | struct svc_serv *serv = svsk->sk_server; | |
737 | struct sk_buff *skb; | |
bc375ea7 DM |
738 | union { |
739 | struct cmsghdr hdr; | |
740 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
741 | } buffer; | |
742 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 | 743 | int err, len; |
7a37f578 N |
744 | struct msghdr msg = { |
745 | .msg_name = svc_addr(rqstp), | |
746 | .msg_control = cmh, | |
747 | .msg_controllen = sizeof(buffer), | |
748 | .msg_flags = MSG_DONTWAIT, | |
749 | }; | |
1da177e4 LT |
750 | |
751 | if (test_and_clear_bit(SK_CHNGBUF, &svsk->sk_flags)) | |
752 | /* udp sockets need large rcvbuf as all pending | |
753 | * requests are still in that buffer. sndbuf must | |
754 | * also be large enough that there is enough space | |
3262c816 GB |
755 | * for one reply per thread. We count all threads |
756 | * rather than threads in a particular pool, which | |
757 | * provides an upper bound on the number of threads | |
758 | * which will access the socket. | |
1da177e4 LT |
759 | */ |
760 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
761 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
762 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 LT |
763 | |
764 | if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) { | |
765 | svc_sock_received(svsk); | |
766 | return svc_deferred_recv(rqstp); | |
767 | } | |
768 | ||
769 | clear_bit(SK_DATA, &svsk->sk_flags); | |
05ed690e N |
770 | skb = NULL; |
771 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
772 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
773 | if (err >= 0) | |
774 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
775 | ||
776 | if (skb == NULL) { | |
777 | if (err != -EAGAIN) { | |
778 | /* possibly an icmp error */ | |
779 | dprintk("svc: recvfrom returned error %d\n", -err); | |
780 | set_bit(SK_DATA, &svsk->sk_flags); | |
1da177e4 | 781 | } |
05ed690e N |
782 | svc_sock_received(svsk); |
783 | return -EAGAIN; | |
1da177e4 | 784 | } |
7a37f578 | 785 | rqstp->rq_addrlen = sizeof(rqstp->rq_addr); |
b7aa0bf7 ED |
786 | if (skb->tstamp.tv64 == 0) { |
787 | skb->tstamp = ktime_get_real(); | |
cca5172a | 788 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
789 | need that much accuracy */ |
790 | } | |
b7aa0bf7 | 791 | svsk->sk_sk->sk_stamp = skb->tstamp; |
1da177e4 LT |
792 | set_bit(SK_DATA, &svsk->sk_flags); /* there may be more data... */ |
793 | ||
794 | /* | |
795 | * Maybe more packets - kick another thread ASAP. | |
796 | */ | |
797 | svc_sock_received(svsk); | |
798 | ||
799 | len = skb->len - sizeof(struct udphdr); | |
800 | rqstp->rq_arg.len = len; | |
801 | ||
95756482 | 802 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 803 | |
7a37f578 N |
804 | if (cmh->cmsg_level != IPPROTO_IP || |
805 | cmh->cmsg_type != IP_PKTINFO) { | |
806 | if (net_ratelimit()) | |
807 | printk("rpcsvc: received unknown control message:" | |
808 | "%d/%d\n", | |
809 | cmh->cmsg_level, cmh->cmsg_type); | |
810 | skb_free_datagram(svsk->sk_sk, skb); | |
811 | return 0; | |
812 | } | |
813 | svc_udp_get_dest_address(rqstp, cmh); | |
1da177e4 LT |
814 | |
815 | if (skb_is_nonlinear(skb)) { | |
816 | /* we have to copy */ | |
817 | local_bh_disable(); | |
818 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
819 | local_bh_enable(); | |
820 | /* checksum error */ | |
821 | skb_free_datagram(svsk->sk_sk, skb); | |
822 | return 0; | |
823 | } | |
824 | local_bh_enable(); | |
cca5172a | 825 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
826 | } else { |
827 | /* we can use it in-place */ | |
828 | rqstp->rq_arg.head[0].iov_base = skb->data + sizeof(struct udphdr); | |
829 | rqstp->rq_arg.head[0].iov_len = len; | |
fb286bb2 HX |
830 | if (skb_checksum_complete(skb)) { |
831 | skb_free_datagram(svsk->sk_sk, skb); | |
832 | return 0; | |
1da177e4 | 833 | } |
5148bf4e | 834 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
835 | } |
836 | ||
837 | rqstp->rq_arg.page_base = 0; | |
838 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
839 | rqstp->rq_arg.head[0].iov_len = len; | |
840 | rqstp->rq_arg.page_len = 0; | |
44524359 | 841 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
842 | } else { |
843 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 844 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 845 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
846 | } |
847 | ||
848 | if (serv->sv_stats) | |
849 | serv->sv_stats->netudpcnt++; | |
850 | ||
851 | return len; | |
852 | } | |
853 | ||
854 | static int | |
855 | svc_udp_sendto(struct svc_rqst *rqstp) | |
856 | { | |
857 | int error; | |
858 | ||
859 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
860 | if (error == -ECONNREFUSED) | |
861 | /* ICMP error on earlier request. */ | |
862 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
863 | ||
864 | return error; | |
865 | } | |
866 | ||
e831fe65 TT |
867 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
868 | { | |
869 | } | |
870 | ||
323bee32 TT |
871 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
872 | { | |
873 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
874 | struct svc_serv *serv = svsk->sk_server; | |
875 | unsigned long required; | |
876 | ||
877 | /* | |
878 | * Set the SOCK_NOSPACE flag before checking the available | |
879 | * sock space. | |
880 | */ | |
881 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
882 | required = atomic_read(&svsk->sk_reserved) + serv->sv_max_mesg; | |
883 | if (required*2 > sock_wspace(svsk->sk_sk)) | |
884 | return 0; | |
885 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
886 | return 1; | |
887 | } | |
888 | ||
38a417cc TT |
889 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
890 | { | |
891 | BUG(); | |
892 | return NULL; | |
893 | } | |
894 | ||
b700cbb1 TT |
895 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
896 | struct sockaddr *sa, int salen, | |
897 | int flags) | |
898 | { | |
899 | return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags); | |
900 | } | |
901 | ||
360d8738 | 902 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 903 | .xpo_create = svc_udp_create, |
5d137990 TT |
904 | .xpo_recvfrom = svc_udp_recvfrom, |
905 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 906 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
907 | .xpo_detach = svc_sock_detach, |
908 | .xpo_free = svc_sock_free, | |
e831fe65 | 909 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 910 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 911 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
912 | }; |
913 | ||
914 | static struct svc_xprt_class svc_udp_class = { | |
915 | .xcl_name = "udp", | |
b700cbb1 | 916 | .xcl_owner = THIS_MODULE, |
360d8738 | 917 | .xcl_ops = &svc_udp_ops, |
49023155 | 918 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
919 | }; |
920 | ||
1da177e4 LT |
921 | static void |
922 | svc_udp_init(struct svc_sock *svsk) | |
923 | { | |
7a37f578 N |
924 | int one = 1; |
925 | mm_segment_t oldfs; | |
926 | ||
360d8738 | 927 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt); |
1da177e4 LT |
928 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
929 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
930 | |
931 | /* initialise setting must have enough space to | |
cca5172a | 932 | * receive and respond to one request. |
1da177e4 LT |
933 | * svc_udp_recvfrom will re-adjust if necessary |
934 | */ | |
935 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
936 | 3 * svsk->sk_server->sv_max_mesg, |
937 | 3 * svsk->sk_server->sv_max_mesg); | |
1da177e4 LT |
938 | |
939 | set_bit(SK_DATA, &svsk->sk_flags); /* might have come in before data_ready set up */ | |
940 | set_bit(SK_CHNGBUF, &svsk->sk_flags); | |
7a37f578 N |
941 | |
942 | oldfs = get_fs(); | |
943 | set_fs(KERNEL_DS); | |
944 | /* make sure we get destination address info */ | |
945 | svsk->sk_sock->ops->setsockopt(svsk->sk_sock, IPPROTO_IP, IP_PKTINFO, | |
946 | (char __user *)&one, sizeof(one)); | |
947 | set_fs(oldfs); | |
1da177e4 LT |
948 | } |
949 | ||
950 | /* | |
951 | * A data_ready event on a listening socket means there's a connection | |
952 | * pending. Do not use state_change as a substitute for it. | |
953 | */ | |
954 | static void | |
955 | svc_tcp_listen_data_ready(struct sock *sk, int count_unused) | |
956 | { | |
939bb7ef | 957 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
958 | |
959 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 960 | sk, sk->sk_state); |
1da177e4 | 961 | |
939bb7ef NB |
962 | /* |
963 | * This callback may called twice when a new connection | |
964 | * is established as a child socket inherits everything | |
965 | * from a parent LISTEN socket. | |
966 | * 1) data_ready method of the parent socket will be called | |
967 | * when one of child sockets become ESTABLISHED. | |
968 | * 2) data_ready method of the child socket may be called | |
969 | * when it receives data before the socket is accepted. | |
970 | * In case of 2, we should ignore it silently. | |
971 | */ | |
972 | if (sk->sk_state == TCP_LISTEN) { | |
973 | if (svsk) { | |
974 | set_bit(SK_CONN, &svsk->sk_flags); | |
975 | svc_sock_enqueue(svsk); | |
976 | } else | |
977 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 978 | } |
939bb7ef | 979 | |
1da177e4 LT |
980 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
981 | wake_up_interruptible_all(sk->sk_sleep); | |
982 | } | |
983 | ||
984 | /* | |
985 | * A state change on a connected socket means it's dying or dead. | |
986 | */ | |
987 | static void | |
988 | svc_tcp_state_change(struct sock *sk) | |
989 | { | |
939bb7ef | 990 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
991 | |
992 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 993 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 994 | |
939bb7ef | 995 | if (!svsk) |
1da177e4 | 996 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef NB |
997 | else { |
998 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
999 | svc_sock_enqueue(svsk); | |
1da177e4 | 1000 | } |
1da177e4 LT |
1001 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
1002 | wake_up_interruptible_all(sk->sk_sleep); | |
1003 | } | |
1004 | ||
1005 | static void | |
1006 | svc_tcp_data_ready(struct sock *sk, int count) | |
1007 | { | |
939bb7ef | 1008 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
1009 | |
1010 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
1011 | sk, sk->sk_user_data); |
1012 | if (svsk) { | |
1013 | set_bit(SK_DATA, &svsk->sk_flags); | |
1014 | svc_sock_enqueue(svsk); | |
1015 | } | |
1da177e4 LT |
1016 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
1017 | wake_up_interruptible(sk->sk_sleep); | |
1018 | } | |
1019 | ||
bcdb81ae CL |
1020 | static inline int svc_port_is_privileged(struct sockaddr *sin) |
1021 | { | |
1022 | switch (sin->sa_family) { | |
1023 | case AF_INET: | |
1024 | return ntohs(((struct sockaddr_in *)sin)->sin_port) | |
1025 | < PROT_SOCK; | |
bcdb81ae CL |
1026 | case AF_INET6: |
1027 | return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) | |
1028 | < PROT_SOCK; | |
bcdb81ae CL |
1029 | default: |
1030 | return 0; | |
1031 | } | |
1032 | } | |
1033 | ||
1da177e4 LT |
1034 | /* |
1035 | * Accept a TCP connection | |
1036 | */ | |
38a417cc | 1037 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 1038 | { |
38a417cc | 1039 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f AM |
1040 | struct sockaddr_storage addr; |
1041 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
1da177e4 LT |
1042 | struct svc_serv *serv = svsk->sk_server; |
1043 | struct socket *sock = svsk->sk_sock; | |
1044 | struct socket *newsock; | |
1da177e4 LT |
1045 | struct svc_sock *newsvsk; |
1046 | int err, slen; | |
ad06e4bd | 1047 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
1048 | |
1049 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
1050 | if (!sock) | |
38a417cc | 1051 | return NULL; |
1da177e4 | 1052 | |
e6242e92 SS |
1053 | clear_bit(SK_CONN, &svsk->sk_flags); |
1054 | err = kernel_accept(sock, &newsock, O_NONBLOCK); | |
1055 | if (err < 0) { | |
1da177e4 LT |
1056 | if (err == -ENOMEM) |
1057 | printk(KERN_WARNING "%s: no more sockets!\n", | |
1058 | serv->sv_name); | |
e6242e92 | 1059 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
1060 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
1061 | serv->sv_name, -err); | |
38a417cc | 1062 | return NULL; |
1da177e4 | 1063 | } |
e6242e92 | 1064 | |
1da177e4 | 1065 | set_bit(SK_CONN, &svsk->sk_flags); |
1da177e4 | 1066 | |
cdd88b9f | 1067 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
1068 | if (err < 0) { |
1069 | if (net_ratelimit()) | |
1070 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
1071 | serv->sv_name, -err); | |
1072 | goto failed; /* aborted connection or whatever */ | |
1073 | } | |
1074 | ||
1075 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
1076 | * hosts here, but when we get encryption, the IP of the host won't |
1077 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 1078 | */ |
cdd88b9f | 1079 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 1080 | dprintk(KERN_WARNING |
ad06e4bd | 1081 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 1082 | serv->sv_name, |
cdd88b9f | 1083 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 1084 | } |
ad06e4bd | 1085 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 1086 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1087 | |
1088 | /* make sure that a write doesn't block forever when | |
1089 | * low on memory | |
1090 | */ | |
1091 | newsock->sk->sk_sndtimeo = HZ*30; | |
1092 | ||
6b174337 CL |
1093 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
1094 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 1095 | goto failed; |
cdd88b9f | 1096 | memcpy(&newsvsk->sk_remote, sin, slen); |
067d7817 | 1097 | newsvsk->sk_remotelen = slen; |
a9747692 FM |
1098 | err = kernel_getsockname(newsock, sin, &slen); |
1099 | if (unlikely(err < 0)) { | |
1100 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
1101 | slen = offsetof(struct sockaddr, sa_data); | |
1102 | } | |
1103 | memcpy(&newsvsk->sk_local, sin, slen); | |
067d7817 | 1104 | |
e79eff1f | 1105 | svc_sock_received(newsvsk); |
1da177e4 | 1106 | |
f9f3cc4f TT |
1107 | if (serv->sv_stats) |
1108 | serv->sv_stats->nettcpconn++; | |
1109 | ||
1110 | return &newsvsk->sk_xprt; | |
1111 | ||
1112 | failed: | |
1113 | sock_release(newsock); | |
1114 | return NULL; | |
1115 | } | |
1116 | ||
1da177e4 LT |
1117 | /* |
1118 | * Receive data from a TCP socket. | |
1119 | */ | |
1120 | static int | |
1121 | svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1122 | { | |
1123 | struct svc_sock *svsk = rqstp->rq_sock; | |
1124 | struct svc_serv *serv = svsk->sk_server; | |
1125 | int len; | |
3cc03b16 | 1126 | struct kvec *vec; |
1da177e4 LT |
1127 | int pnum, vlen; |
1128 | ||
1129 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1130 | svsk, test_bit(SK_DATA, &svsk->sk_flags), | |
1131 | test_bit(SK_CONN, &svsk->sk_flags), | |
1132 | test_bit(SK_CLOSE, &svsk->sk_flags)); | |
1133 | ||
1134 | if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) { | |
1135 | svc_sock_received(svsk); | |
1136 | return svc_deferred_recv(rqstp); | |
1137 | } | |
1138 | ||
1da177e4 LT |
1139 | if (test_and_clear_bit(SK_CHNGBUF, &svsk->sk_flags)) |
1140 | /* sndbuf needs to have room for one request | |
1141 | * per thread, otherwise we can stall even when the | |
1142 | * network isn't a bottleneck. | |
3262c816 GB |
1143 | * |
1144 | * We count all threads rather than threads in a | |
1145 | * particular pool, which provides an upper bound | |
1146 | * on the number of threads which will access the socket. | |
1147 | * | |
1da177e4 | 1148 | * rcvbuf just needs to be able to hold a few requests. |
cca5172a | 1149 | * Normally they will be removed from the queue |
1da177e4 LT |
1150 | * as soon a a complete request arrives. |
1151 | */ | |
1152 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
1153 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
1154 | 3 * serv->sv_max_mesg); | |
1da177e4 LT |
1155 | |
1156 | clear_bit(SK_DATA, &svsk->sk_flags); | |
1157 | ||
1158 | /* Receive data. If we haven't got the record length yet, get | |
1159 | * the next four bytes. Otherwise try to gobble up as much as | |
1160 | * possible up to the complete record length. | |
1161 | */ | |
1162 | if (svsk->sk_tcplen < 4) { | |
1163 | unsigned long want = 4 - svsk->sk_tcplen; | |
1164 | struct kvec iov; | |
1165 | ||
1166 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; | |
1167 | iov.iov_len = want; | |
1168 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
1169 | goto error; | |
1170 | svsk->sk_tcplen += len; | |
1171 | ||
1172 | if (len < want) { | |
1173 | dprintk("svc: short recvfrom while reading record length (%d of %lu)\n", | |
cca5172a | 1174 | len, want); |
1da177e4 LT |
1175 | svc_sock_received(svsk); |
1176 | return -EAGAIN; /* record header not complete */ | |
1177 | } | |
1178 | ||
1179 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
1180 | if (!(svsk->sk_reclen & 0x80000000)) { | |
1181 | /* FIXME: technically, a record can be fragmented, | |
1182 | * and non-terminal fragments will not have the top | |
1183 | * bit set in the fragment length header. | |
1184 | * But apparently no known nfs clients send fragmented | |
1185 | * records. */ | |
34e9a63b N |
1186 | if (net_ratelimit()) |
1187 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
1188 | " (non-terminal)\n", | |
1189 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
1190 | goto err_delete; |
1191 | } | |
1192 | svsk->sk_reclen &= 0x7fffffff; | |
1193 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); | |
c6b0a9f8 | 1194 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b N |
1195 | if (net_ratelimit()) |
1196 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
1197 | " (large)\n", | |
1198 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
1199 | goto err_delete; |
1200 | } | |
1201 | } | |
1202 | ||
1203 | /* Check whether enough data is available */ | |
1204 | len = svc_recv_available(svsk); | |
1205 | if (len < 0) | |
1206 | goto error; | |
1207 | ||
1208 | if (len < svsk->sk_reclen) { | |
1209 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
1210 | len, svsk->sk_reclen); | |
1211 | svc_sock_received(svsk); | |
1212 | return -EAGAIN; /* record not complete */ | |
1213 | } | |
1214 | len = svsk->sk_reclen; | |
1215 | set_bit(SK_DATA, &svsk->sk_flags); | |
1216 | ||
3cc03b16 | 1217 | vec = rqstp->rq_vec; |
1da177e4 LT |
1218 | vec[0] = rqstp->rq_arg.head[0]; |
1219 | vlen = PAGE_SIZE; | |
1220 | pnum = 1; | |
1221 | while (vlen < len) { | |
44524359 | 1222 | vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]); |
1da177e4 LT |
1223 | vec[pnum].iov_len = PAGE_SIZE; |
1224 | pnum++; | |
1225 | vlen += PAGE_SIZE; | |
1226 | } | |
44524359 | 1227 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1228 | |
1229 | /* Now receive data */ | |
1230 | len = svc_recvfrom(rqstp, vec, pnum, len); | |
1231 | if (len < 0) | |
1232 | goto error; | |
1233 | ||
1234 | dprintk("svc: TCP complete record (%d bytes)\n", len); | |
1235 | rqstp->rq_arg.len = len; | |
1236 | rqstp->rq_arg.page_base = 0; | |
1237 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
1238 | rqstp->rq_arg.head[0].iov_len = len; | |
1239 | rqstp->rq_arg.page_len = 0; | |
1240 | } else { | |
1241 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
1242 | } | |
1243 | ||
5148bf4e | 1244 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
1245 | rqstp->rq_prot = IPPROTO_TCP; |
1246 | ||
1247 | /* Reset TCP read info */ | |
1248 | svsk->sk_reclen = 0; | |
1249 | svsk->sk_tcplen = 0; | |
1250 | ||
1251 | svc_sock_received(svsk); | |
1252 | if (serv->sv_stats) | |
1253 | serv->sv_stats->nettcpcnt++; | |
1254 | ||
1255 | return len; | |
1256 | ||
1257 | err_delete: | |
d7979ae4 | 1258 | set_bit(SK_CLOSE, &svsk->sk_flags); |
1da177e4 LT |
1259 | return -EAGAIN; |
1260 | ||
1261 | error: | |
1262 | if (len == -EAGAIN) { | |
1263 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
1264 | svc_sock_received(svsk); | |
1265 | } else { | |
1266 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
1267 | svsk->sk_server->sv_name, -len); | |
93fbf1a5 | 1268 | goto err_delete; |
1da177e4 LT |
1269 | } |
1270 | ||
1271 | return len; | |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * Send out data on TCP socket. | |
1276 | */ | |
1277 | static int | |
1278 | svc_tcp_sendto(struct svc_rqst *rqstp) | |
1279 | { | |
1280 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1281 | int sent; | |
d8ed029d | 1282 | __be32 reclen; |
1da177e4 LT |
1283 | |
1284 | /* Set up the first element of the reply kvec. | |
1285 | * Any other kvecs that may be in use have been taken | |
1286 | * care of by the server implementation itself. | |
1287 | */ | |
1288 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1289 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1290 | ||
1291 | if (test_bit(SK_DEAD, &rqstp->rq_sock->sk_flags)) | |
1292 | return -ENOTCONN; | |
1293 | ||
1294 | sent = svc_sendto(rqstp, &rqstp->rq_res); | |
1295 | if (sent != xbufp->len) { | |
1296 | printk(KERN_NOTICE "rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n", | |
1297 | rqstp->rq_sock->sk_server->sv_name, | |
1298 | (sent<0)?"got error":"sent only", | |
1299 | sent, xbufp->len); | |
aaf68cfb N |
1300 | set_bit(SK_CLOSE, &rqstp->rq_sock->sk_flags); |
1301 | svc_sock_enqueue(rqstp->rq_sock); | |
1da177e4 LT |
1302 | sent = -EAGAIN; |
1303 | } | |
1304 | return sent; | |
1305 | } | |
1306 | ||
e831fe65 TT |
1307 | /* |
1308 | * Setup response header. TCP has a 4B record length field. | |
1309 | */ | |
1310 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1311 | { | |
1312 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1313 | ||
1314 | /* tcp needs a space for the record length... */ | |
1315 | svc_putnl(resv, 0); | |
1316 | } | |
1317 | ||
323bee32 TT |
1318 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
1319 | { | |
1320 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1321 | struct svc_serv *serv = svsk->sk_server; | |
1322 | int required; | |
1323 | int wspace; | |
1324 | ||
1325 | /* | |
1326 | * Set the SOCK_NOSPACE flag before checking the available | |
1327 | * sock space. | |
1328 | */ | |
1329 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
1330 | required = atomic_read(&svsk->sk_reserved) + serv->sv_max_mesg; | |
1331 | wspace = sk_stream_wspace(svsk->sk_sk); | |
1332 | ||
1333 | if (wspace < sk_stream_min_wspace(svsk->sk_sk)) | |
1334 | return 0; | |
1335 | if (required * 2 > wspace) | |
1336 | return 0; | |
1337 | ||
1338 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
1339 | return 1; | |
1340 | } | |
1341 | ||
b700cbb1 TT |
1342 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
1343 | struct sockaddr *sa, int salen, | |
1344 | int flags) | |
1345 | { | |
1346 | return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags); | |
1347 | } | |
1348 | ||
360d8738 | 1349 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1350 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1351 | .xpo_recvfrom = svc_tcp_recvfrom, |
1352 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1353 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
1354 | .xpo_detach = svc_sock_detach, |
1355 | .xpo_free = svc_sock_free, | |
e831fe65 | 1356 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1357 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1358 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1359 | }; |
1360 | ||
1361 | static struct svc_xprt_class svc_tcp_class = { | |
1362 | .xcl_name = "tcp", | |
b700cbb1 | 1363 | .xcl_owner = THIS_MODULE, |
360d8738 | 1364 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1365 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1366 | }; |
1367 | ||
1368 | void svc_init_xprt_sock(void) | |
1369 | { | |
1370 | svc_reg_xprt_class(&svc_tcp_class); | |
1371 | svc_reg_xprt_class(&svc_udp_class); | |
1372 | } | |
1373 | ||
1374 | void svc_cleanup_xprt_sock(void) | |
1375 | { | |
1376 | svc_unreg_xprt_class(&svc_tcp_class); | |
1377 | svc_unreg_xprt_class(&svc_udp_class); | |
1378 | } | |
1379 | ||
1da177e4 LT |
1380 | static void |
1381 | svc_tcp_init(struct svc_sock *svsk) | |
1382 | { | |
1383 | struct sock *sk = svsk->sk_sk; | |
1384 | struct tcp_sock *tp = tcp_sk(sk); | |
1385 | ||
360d8738 | 1386 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt); |
1da177e4 LT |
1387 | |
1388 | if (sk->sk_state == TCP_LISTEN) { | |
1389 | dprintk("setting up TCP socket for listening\n"); | |
38a417cc | 1390 | set_bit(SK_LISTENER, &svsk->sk_flags); |
1da177e4 LT |
1391 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
1392 | set_bit(SK_CONN, &svsk->sk_flags); | |
1393 | } else { | |
1394 | dprintk("setting up TCP socket for reading\n"); | |
1395 | sk->sk_state_change = svc_tcp_state_change; | |
1396 | sk->sk_data_ready = svc_tcp_data_ready; | |
1397 | sk->sk_write_space = svc_write_space; | |
1398 | ||
1399 | svsk->sk_reclen = 0; | |
1400 | svsk->sk_tcplen = 0; | |
1401 | ||
1402 | tp->nonagle = 1; /* disable Nagle's algorithm */ | |
1403 | ||
1404 | /* initialise setting must have enough space to | |
cca5172a | 1405 | * receive and respond to one request. |
1da177e4 LT |
1406 | * svc_tcp_recvfrom will re-adjust if necessary |
1407 | */ | |
1408 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
1409 | 3 * svsk->sk_server->sv_max_mesg, |
1410 | 3 * svsk->sk_server->sv_max_mesg); | |
1da177e4 LT |
1411 | |
1412 | set_bit(SK_CHNGBUF, &svsk->sk_flags); | |
1413 | set_bit(SK_DATA, &svsk->sk_flags); | |
cca5172a | 1414 | if (sk->sk_state != TCP_ESTABLISHED) |
1da177e4 LT |
1415 | set_bit(SK_CLOSE, &svsk->sk_flags); |
1416 | } | |
1417 | } | |
1418 | ||
1419 | void | |
1420 | svc_sock_update_bufs(struct svc_serv *serv) | |
1421 | { | |
1422 | /* | |
1423 | * The number of server threads has changed. Update | |
1424 | * rcvbuf and sndbuf accordingly on all sockets | |
1425 | */ | |
1426 | struct list_head *le; | |
1427 | ||
1428 | spin_lock_bh(&serv->sv_lock); | |
1429 | list_for_each(le, &serv->sv_permsocks) { | |
cca5172a | 1430 | struct svc_sock *svsk = |
1da177e4 LT |
1431 | list_entry(le, struct svc_sock, sk_list); |
1432 | set_bit(SK_CHNGBUF, &svsk->sk_flags); | |
1433 | } | |
1434 | list_for_each(le, &serv->sv_tempsocks) { | |
1435 | struct svc_sock *svsk = | |
1436 | list_entry(le, struct svc_sock, sk_list); | |
1437 | set_bit(SK_CHNGBUF, &svsk->sk_flags); | |
1438 | } | |
1439 | spin_unlock_bh(&serv->sv_lock); | |
1440 | } | |
1441 | ||
e1b3157f TT |
1442 | /* |
1443 | * Make sure that we don't have too many active connections. If we | |
1444 | * have, something must be dropped. | |
1445 | * | |
1446 | * There's no point in trying to do random drop here for DoS | |
1447 | * prevention. The NFS clients does 1 reconnect in 15 seconds. An | |
1448 | * attacker can easily beat that. | |
1449 | * | |
1450 | * The only somewhat efficient mechanism would be if drop old | |
1451 | * connections from the same IP first. But right now we don't even | |
1452 | * record the client IP in svc_sock. | |
1453 | */ | |
1454 | static void svc_check_conn_limits(struct svc_serv *serv) | |
1455 | { | |
1456 | if (serv->sv_tmpcnt > (serv->sv_nrthreads+3)*20) { | |
1457 | struct svc_sock *svsk = NULL; | |
1458 | spin_lock_bh(&serv->sv_lock); | |
1459 | if (!list_empty(&serv->sv_tempsocks)) { | |
1460 | if (net_ratelimit()) { | |
1461 | /* Try to help the admin */ | |
1462 | printk(KERN_NOTICE "%s: too many open TCP " | |
1463 | "sockets, consider increasing the " | |
1464 | "number of nfsd threads\n", | |
1465 | serv->sv_name); | |
1466 | } | |
1467 | /* | |
1468 | * Always select the oldest socket. It's not fair, | |
1469 | * but so is life | |
1470 | */ | |
1471 | svsk = list_entry(serv->sv_tempsocks.prev, | |
1472 | struct svc_sock, | |
1473 | sk_list); | |
1474 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
1475 | svc_xprt_get(&svsk->sk_xprt); | |
1476 | } | |
1477 | spin_unlock_bh(&serv->sv_lock); | |
1478 | ||
1479 | if (svsk) { | |
1480 | svc_sock_enqueue(svsk); | |
1481 | svc_xprt_put(&svsk->sk_xprt); | |
1482 | } | |
1483 | } | |
1484 | } | |
1485 | ||
1da177e4 | 1486 | /* |
3262c816 GB |
1487 | * Receive the next request on any socket. This code is carefully |
1488 | * organised not to touch any cachelines in the shared svc_serv | |
1489 | * structure, only cachelines in the local svc_pool. | |
1da177e4 LT |
1490 | */ |
1491 | int | |
6fb2b47f | 1492 | svc_recv(struct svc_rqst *rqstp, long timeout) |
1da177e4 | 1493 | { |
27459f09 | 1494 | struct svc_sock *svsk = NULL; |
6fb2b47f | 1495 | struct svc_serv *serv = rqstp->rq_server; |
3262c816 | 1496 | struct svc_pool *pool = rqstp->rq_pool; |
44524359 | 1497 | int len, i; |
1da177e4 LT |
1498 | int pages; |
1499 | struct xdr_buf *arg; | |
1500 | DECLARE_WAITQUEUE(wait, current); | |
1501 | ||
1502 | dprintk("svc: server %p waiting for data (to = %ld)\n", | |
1503 | rqstp, timeout); | |
1504 | ||
1505 | if (rqstp->rq_sock) | |
cca5172a | 1506 | printk(KERN_ERR |
1da177e4 LT |
1507 | "svc_recv: service %p, socket not NULL!\n", |
1508 | rqstp); | |
1509 | if (waitqueue_active(&rqstp->rq_wait)) | |
cca5172a | 1510 | printk(KERN_ERR |
1da177e4 LT |
1511 | "svc_recv: service %p, wait queue active!\n", |
1512 | rqstp); | |
1513 | ||
1da177e4 LT |
1514 | |
1515 | /* now allocate needed pages. If we get a failure, sleep briefly */ | |
c6b0a9f8 | 1516 | pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE; |
44524359 N |
1517 | for (i=0; i < pages ; i++) |
1518 | while (rqstp->rq_pages[i] == NULL) { | |
1519 | struct page *p = alloc_page(GFP_KERNEL); | |
1520 | if (!p) | |
1521 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); | |
1522 | rqstp->rq_pages[i] = p; | |
1da177e4 | 1523 | } |
250f3915 N |
1524 | rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ |
1525 | BUG_ON(pages >= RPCSVC_MAXPAGES); | |
1da177e4 LT |
1526 | |
1527 | /* Make arg->head point to first page and arg->pages point to rest */ | |
1528 | arg = &rqstp->rq_arg; | |
44524359 | 1529 | arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); |
1da177e4 | 1530 | arg->head[0].iov_len = PAGE_SIZE; |
44524359 | 1531 | arg->pages = rqstp->rq_pages + 1; |
1da177e4 LT |
1532 | arg->page_base = 0; |
1533 | /* save at least one page for response */ | |
1534 | arg->page_len = (pages-2)*PAGE_SIZE; | |
1535 | arg->len = (pages-1)*PAGE_SIZE; | |
1536 | arg->tail[0].iov_len = 0; | |
3e1d1d28 CL |
1537 | |
1538 | try_to_freeze(); | |
1887b935 | 1539 | cond_resched(); |
1da177e4 LT |
1540 | if (signalled()) |
1541 | return -EINTR; | |
1542 | ||
3262c816 GB |
1543 | spin_lock_bh(&pool->sp_lock); |
1544 | if ((svsk = svc_sock_dequeue(pool)) != NULL) { | |
1da177e4 | 1545 | rqstp->rq_sock = svsk; |
e1b3157f | 1546 | svc_xprt_get(&svsk->sk_xprt); |
c6b0a9f8 | 1547 | rqstp->rq_reserved = serv->sv_max_mesg; |
5685f0fa | 1548 | atomic_add(rqstp->rq_reserved, &svsk->sk_reserved); |
1da177e4 LT |
1549 | } else { |
1550 | /* No data pending. Go to sleep */ | |
3262c816 | 1551 | svc_thread_enqueue(pool, rqstp); |
1da177e4 LT |
1552 | |
1553 | /* | |
1554 | * We have to be able to interrupt this wait | |
1555 | * to bring down the daemons ... | |
1556 | */ | |
1557 | set_current_state(TASK_INTERRUPTIBLE); | |
1558 | add_wait_queue(&rqstp->rq_wait, &wait); | |
3262c816 | 1559 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 LT |
1560 | |
1561 | schedule_timeout(timeout); | |
1562 | ||
3e1d1d28 | 1563 | try_to_freeze(); |
1da177e4 | 1564 | |
3262c816 | 1565 | spin_lock_bh(&pool->sp_lock); |
1da177e4 LT |
1566 | remove_wait_queue(&rqstp->rq_wait, &wait); |
1567 | ||
1568 | if (!(svsk = rqstp->rq_sock)) { | |
3262c816 GB |
1569 | svc_thread_dequeue(pool, rqstp); |
1570 | spin_unlock_bh(&pool->sp_lock); | |
1da177e4 LT |
1571 | dprintk("svc: server %p, no data yet\n", rqstp); |
1572 | return signalled()? -EINTR : -EAGAIN; | |
1573 | } | |
1574 | } | |
3262c816 | 1575 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 | 1576 | |
d7979ae4 TT |
1577 | len = 0; |
1578 | if (test_bit(SK_CLOSE, &svsk->sk_flags)) { | |
1579 | dprintk("svc_recv: found SK_CLOSE\n"); | |
1580 | svc_delete_socket(svsk); | |
38a417cc TT |
1581 | } else if (test_bit(SK_LISTENER, &svsk->sk_flags)) { |
1582 | struct svc_xprt *newxpt; | |
1583 | newxpt = svsk->sk_xprt.xpt_ops->xpo_accept(&svsk->sk_xprt); | |
b700cbb1 TT |
1584 | if (newxpt) { |
1585 | /* | |
1586 | * We know this module_get will succeed because the | |
1587 | * listener holds a reference too | |
1588 | */ | |
1589 | __module_get(newxpt->xpt_class->xcl_owner); | |
f9f3cc4f | 1590 | svc_check_conn_limits(svsk->sk_server); |
b700cbb1 | 1591 | } |
38a417cc | 1592 | svc_sock_received(svsk); |
d7979ae4 TT |
1593 | } else { |
1594 | dprintk("svc: server %p, pool %u, socket %p, inuse=%d\n", | |
e1b3157f TT |
1595 | rqstp, pool->sp_id, svsk, |
1596 | atomic_read(&svsk->sk_xprt.xpt_ref.refcount)); | |
d7979ae4 TT |
1597 | len = svsk->sk_xprt.xpt_ops->xpo_recvfrom(rqstp); |
1598 | dprintk("svc: got len=%d\n", len); | |
1599 | } | |
1da177e4 LT |
1600 | |
1601 | /* No data, incomplete (TCP) read, or accept() */ | |
1602 | if (len == 0 || len == -EAGAIN) { | |
1603 | rqstp->rq_res.len = 0; | |
1604 | svc_sock_release(rqstp); | |
1605 | return -EAGAIN; | |
1606 | } | |
1607 | svsk->sk_lastrecv = get_seconds(); | |
36bdfc8b | 1608 | clear_bit(SK_OLD, &svsk->sk_flags); |
1da177e4 | 1609 | |
bcdb81ae | 1610 | rqstp->rq_secure = svc_port_is_privileged(svc_addr(rqstp)); |
1da177e4 LT |
1611 | rqstp->rq_chandle.defer = svc_defer; |
1612 | ||
1613 | if (serv->sv_stats) | |
1614 | serv->sv_stats->netcnt++; | |
1615 | return len; | |
1616 | } | |
1617 | ||
cca5172a | 1618 | /* |
1da177e4 LT |
1619 | * Drop request |
1620 | */ | |
1621 | void | |
1622 | svc_drop(struct svc_rqst *rqstp) | |
1623 | { | |
1624 | dprintk("svc: socket %p dropped request\n", rqstp->rq_sock); | |
1625 | svc_sock_release(rqstp); | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * Return reply to client. | |
1630 | */ | |
1631 | int | |
1632 | svc_send(struct svc_rqst *rqstp) | |
1633 | { | |
1634 | struct svc_sock *svsk; | |
1635 | int len; | |
1636 | struct xdr_buf *xb; | |
1637 | ||
1638 | if ((svsk = rqstp->rq_sock) == NULL) { | |
1639 | printk(KERN_WARNING "NULL socket pointer in %s:%d\n", | |
1640 | __FILE__, __LINE__); | |
1641 | return -EFAULT; | |
1642 | } | |
1643 | ||
1644 | /* release the receive skb before sending the reply */ | |
5148bf4e | 1645 | rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); |
1da177e4 LT |
1646 | |
1647 | /* calculate over-all length */ | |
1648 | xb = & rqstp->rq_res; | |
1649 | xb->len = xb->head[0].iov_len + | |
1650 | xb->page_len + | |
1651 | xb->tail[0].iov_len; | |
1652 | ||
57b47a53 IM |
1653 | /* Grab svsk->sk_mutex to serialize outgoing data. */ |
1654 | mutex_lock(&svsk->sk_mutex); | |
1da177e4 LT |
1655 | if (test_bit(SK_DEAD, &svsk->sk_flags)) |
1656 | len = -ENOTCONN; | |
1657 | else | |
5d137990 | 1658 | len = svsk->sk_xprt.xpt_ops->xpo_sendto(rqstp); |
57b47a53 | 1659 | mutex_unlock(&svsk->sk_mutex); |
1da177e4 LT |
1660 | svc_sock_release(rqstp); |
1661 | ||
1662 | if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN) | |
1663 | return 0; | |
1664 | return len; | |
1665 | } | |
1666 | ||
36bdfc8b GB |
1667 | /* |
1668 | * Timer function to close old temporary sockets, using | |
1669 | * a mark-and-sweep algorithm. | |
1670 | */ | |
1671 | static void | |
1672 | svc_age_temp_sockets(unsigned long closure) | |
1673 | { | |
1674 | struct svc_serv *serv = (struct svc_serv *)closure; | |
1675 | struct svc_sock *svsk; | |
1676 | struct list_head *le, *next; | |
1677 | LIST_HEAD(to_be_aged); | |
1678 | ||
1679 | dprintk("svc_age_temp_sockets\n"); | |
1680 | ||
1681 | if (!spin_trylock_bh(&serv->sv_lock)) { | |
1682 | /* busy, try again 1 sec later */ | |
1683 | dprintk("svc_age_temp_sockets: busy\n"); | |
1684 | mod_timer(&serv->sv_temptimer, jiffies + HZ); | |
1685 | return; | |
1686 | } | |
1687 | ||
1688 | list_for_each_safe(le, next, &serv->sv_tempsocks) { | |
1689 | svsk = list_entry(le, struct svc_sock, sk_list); | |
1690 | ||
1691 | if (!test_and_set_bit(SK_OLD, &svsk->sk_flags)) | |
1692 | continue; | |
e1b3157f TT |
1693 | if (atomic_read(&svsk->sk_xprt.xpt_ref.refcount) > 1 |
1694 | || test_bit(SK_BUSY, &svsk->sk_flags)) | |
36bdfc8b | 1695 | continue; |
e1b3157f | 1696 | svc_xprt_get(&svsk->sk_xprt); |
36bdfc8b GB |
1697 | list_move(le, &to_be_aged); |
1698 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
1699 | set_bit(SK_DETACHED, &svsk->sk_flags); | |
1700 | } | |
1701 | spin_unlock_bh(&serv->sv_lock); | |
1702 | ||
1703 | while (!list_empty(&to_be_aged)) { | |
1704 | le = to_be_aged.next; | |
1705 | /* fiddling the sk_list node is safe 'cos we're SK_DETACHED */ | |
1706 | list_del_init(le); | |
1707 | svsk = list_entry(le, struct svc_sock, sk_list); | |
1708 | ||
1709 | dprintk("queuing svsk %p for closing, %lu seconds old\n", | |
1710 | svsk, get_seconds() - svsk->sk_lastrecv); | |
1711 | ||
1712 | /* a thread will dequeue and close it soon */ | |
1713 | svc_sock_enqueue(svsk); | |
e1b3157f | 1714 | svc_xprt_put(&svsk->sk_xprt); |
36bdfc8b GB |
1715 | } |
1716 | ||
1717 | mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); | |
1718 | } | |
1719 | ||
1da177e4 LT |
1720 | /* |
1721 | * Initialize socket for RPC use and create svc_sock struct | |
1722 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1723 | */ | |
6b174337 CL |
1724 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1725 | struct socket *sock, | |
1726 | int *errp, int flags) | |
1da177e4 LT |
1727 | { |
1728 | struct svc_sock *svsk; | |
1729 | struct sock *inet; | |
6b174337 CL |
1730 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1731 | int is_temporary = flags & SVC_SOCK_TEMPORARY; | |
1da177e4 LT |
1732 | |
1733 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1734 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1735 | *errp = -ENOMEM; |
1736 | return NULL; | |
1737 | } | |
1da177e4 LT |
1738 | |
1739 | inet = sock->sk; | |
1740 | ||
1741 | /* Register socket with portmapper */ | |
1742 | if (*errp >= 0 && pmap_register) | |
1743 | *errp = svc_register(serv, inet->sk_protocol, | |
1744 | ntohs(inet_sk(inet)->sport)); | |
1745 | ||
1746 | if (*errp < 0) { | |
1747 | kfree(svsk); | |
1748 | return NULL; | |
1749 | } | |
1750 | ||
1751 | set_bit(SK_BUSY, &svsk->sk_flags); | |
1752 | inet->sk_user_data = svsk; | |
1753 | svsk->sk_sock = sock; | |
1754 | svsk->sk_sk = inet; | |
1755 | svsk->sk_ostate = inet->sk_state_change; | |
1756 | svsk->sk_odata = inet->sk_data_ready; | |
1757 | svsk->sk_owspace = inet->sk_write_space; | |
1758 | svsk->sk_server = serv; | |
1759 | svsk->sk_lastrecv = get_seconds(); | |
7ac1bea5 | 1760 | spin_lock_init(&svsk->sk_lock); |
1da177e4 LT |
1761 | INIT_LIST_HEAD(&svsk->sk_deferred); |
1762 | INIT_LIST_HEAD(&svsk->sk_ready); | |
57b47a53 | 1763 | mutex_init(&svsk->sk_mutex); |
1da177e4 LT |
1764 | |
1765 | /* Initialize the socket */ | |
1766 | if (sock->type == SOCK_DGRAM) | |
1767 | svc_udp_init(svsk); | |
1768 | else | |
1769 | svc_tcp_init(svsk); | |
1770 | ||
1771 | spin_lock_bh(&serv->sv_lock); | |
6b174337 | 1772 | if (is_temporary) { |
1da177e4 LT |
1773 | set_bit(SK_TEMP, &svsk->sk_flags); |
1774 | list_add(&svsk->sk_list, &serv->sv_tempsocks); | |
1775 | serv->sv_tmpcnt++; | |
36bdfc8b GB |
1776 | if (serv->sv_temptimer.function == NULL) { |
1777 | /* setup timer to age temp sockets */ | |
1778 | setup_timer(&serv->sv_temptimer, svc_age_temp_sockets, | |
1779 | (unsigned long)serv); | |
1780 | mod_timer(&serv->sv_temptimer, | |
1781 | jiffies + svc_conn_age_period * HZ); | |
1782 | } | |
1da177e4 LT |
1783 | } else { |
1784 | clear_bit(SK_TEMP, &svsk->sk_flags); | |
1785 | list_add(&svsk->sk_list, &serv->sv_permsocks); | |
1786 | } | |
1787 | spin_unlock_bh(&serv->sv_lock); | |
1788 | ||
1789 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", | |
1790 | svsk, svsk->sk_sk); | |
1791 | ||
1da177e4 LT |
1792 | return svsk; |
1793 | } | |
1794 | ||
b41b66d6 N |
1795 | int svc_addsock(struct svc_serv *serv, |
1796 | int fd, | |
1797 | char *name_return, | |
1798 | int *proto) | |
1799 | { | |
1800 | int err = 0; | |
1801 | struct socket *so = sockfd_lookup(fd, &err); | |
1802 | struct svc_sock *svsk = NULL; | |
1803 | ||
1804 | if (!so) | |
1805 | return err; | |
1806 | if (so->sk->sk_family != AF_INET) | |
1807 | err = -EAFNOSUPPORT; | |
1808 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1809 | so->sk->sk_protocol != IPPROTO_UDP) | |
1810 | err = -EPROTONOSUPPORT; | |
1811 | else if (so->state > SS_UNCONNECTED) | |
1812 | err = -EISCONN; | |
1813 | else { | |
6b174337 | 1814 | svsk = svc_setup_socket(serv, so, &err, SVC_SOCK_DEFAULTS); |
e79eff1f N |
1815 | if (svsk) { |
1816 | svc_sock_received(svsk); | |
b41b66d6 | 1817 | err = 0; |
e79eff1f | 1818 | } |
b41b66d6 N |
1819 | } |
1820 | if (err) { | |
1821 | sockfd_put(so); | |
1822 | return err; | |
1823 | } | |
1824 | if (proto) *proto = so->sk->sk_protocol; | |
1825 | return one_sock_name(name_return, svsk); | |
1826 | } | |
1827 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1828 | ||
1da177e4 LT |
1829 | /* |
1830 | * Create socket for RPC service. | |
1831 | */ | |
b700cbb1 TT |
1832 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1833 | int protocol, | |
1834 | struct sockaddr *sin, int len, | |
1835 | int flags) | |
1da177e4 LT |
1836 | { |
1837 | struct svc_sock *svsk; | |
1838 | struct socket *sock; | |
1839 | int error; | |
1840 | int type; | |
ad06e4bd | 1841 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 | 1842 | |
ad06e4bd CL |
1843 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1844 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1845 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1846 | |
1847 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1848 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1849 | "sockets supported\n"); | |
b700cbb1 | 1850 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1851 | } |
1852 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; | |
1853 | ||
77f1f67a CL |
1854 | error = sock_create_kern(sin->sa_family, type, protocol, &sock); |
1855 | if (error < 0) | |
b700cbb1 | 1856 | return ERR_PTR(error); |
1da177e4 | 1857 | |
ed07536e PZ |
1858 | svc_reclassify_socket(sock); |
1859 | ||
18114746 | 1860 | if (type == SOCK_STREAM) |
77f1f67a CL |
1861 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
1862 | error = kernel_bind(sock, sin, len); | |
18114746 ES |
1863 | if (error < 0) |
1864 | goto bummer; | |
1da177e4 LT |
1865 | |
1866 | if (protocol == IPPROTO_TCP) { | |
e6242e92 | 1867 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1868 | goto bummer; |
1869 | } | |
1870 | ||
e79eff1f N |
1871 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
1872 | svc_sock_received(svsk); | |
b700cbb1 | 1873 | return (struct svc_xprt *)svsk; |
e79eff1f | 1874 | } |
1da177e4 LT |
1875 | |
1876 | bummer: | |
1877 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1878 | sock_release(sock); | |
b700cbb1 | 1879 | return ERR_PTR(error); |
1da177e4 LT |
1880 | } |
1881 | ||
755cceab TT |
1882 | /* |
1883 | * Detach the svc_sock from the socket so that no | |
1884 | * more callbacks occur. | |
1885 | */ | |
1886 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1887 | { | |
1888 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1889 | struct sock *sk = svsk->sk_sk; | |
1890 | ||
1891 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1892 | ||
1893 | /* put back the old socket callbacks */ | |
1894 | sk->sk_state_change = svsk->sk_ostate; | |
1895 | sk->sk_data_ready = svsk->sk_odata; | |
1896 | sk->sk_write_space = svsk->sk_owspace; | |
1897 | } | |
1898 | ||
1899 | /* | |
1900 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1901 | */ | |
1902 | static void svc_sock_free(struct svc_xprt *xprt) | |
1903 | { | |
1904 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1905 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1906 | ||
1907 | if (svsk->sk_info_authunix != NULL) | |
1908 | svcauth_unix_info_release(svsk->sk_info_authunix); | |
1909 | if (svsk->sk_sock->file) | |
1910 | sockfd_put(svsk->sk_sock); | |
1911 | else | |
1912 | sock_release(svsk->sk_sock); | |
1913 | kfree(svsk); | |
1914 | } | |
1915 | ||
1da177e4 LT |
1916 | /* |
1917 | * Remove a dead socket | |
1918 | */ | |
aaf68cfb | 1919 | static void |
1da177e4 LT |
1920 | svc_delete_socket(struct svc_sock *svsk) |
1921 | { | |
1922 | struct svc_serv *serv; | |
1923 | struct sock *sk; | |
1924 | ||
1925 | dprintk("svc: svc_delete_socket(%p)\n", svsk); | |
1926 | ||
1927 | serv = svsk->sk_server; | |
1928 | sk = svsk->sk_sk; | |
1929 | ||
755cceab | 1930 | svsk->sk_xprt.xpt_ops->xpo_detach(&svsk->sk_xprt); |
1da177e4 LT |
1931 | |
1932 | spin_lock_bh(&serv->sv_lock); | |
1933 | ||
36bdfc8b GB |
1934 | if (!test_and_set_bit(SK_DETACHED, &svsk->sk_flags)) |
1935 | list_del_init(&svsk->sk_list); | |
cca5172a | 1936 | /* |
3262c816 GB |
1937 | * We used to delete the svc_sock from whichever list |
1938 | * it's sk_ready node was on, but we don't actually | |
1939 | * need to. This is because the only time we're called | |
1940 | * while still attached to a queue, the queue itself | |
1941 | * is about to be destroyed (in svc_destroy). | |
1942 | */ | |
aaf68cfb | 1943 | if (!test_and_set_bit(SK_DEAD, &svsk->sk_flags)) { |
e1b3157f | 1944 | BUG_ON(atomic_read(&svsk->sk_xprt.xpt_ref.refcount) < 2); |
1da177e4 LT |
1945 | if (test_bit(SK_TEMP, &svsk->sk_flags)) |
1946 | serv->sv_tmpcnt--; | |
e1b3157f | 1947 | svc_xprt_put(&svsk->sk_xprt); |
aaf68cfb | 1948 | } |
1da177e4 | 1949 | |
d6740df9 | 1950 | spin_unlock_bh(&serv->sv_lock); |
aaf68cfb N |
1951 | } |
1952 | ||
cda1fd4a | 1953 | static void svc_close_socket(struct svc_sock *svsk) |
aaf68cfb N |
1954 | { |
1955 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
1956 | if (test_and_set_bit(SK_BUSY, &svsk->sk_flags)) | |
1957 | /* someone else will have to effect the close */ | |
1958 | return; | |
1959 | ||
e1b3157f | 1960 | svc_xprt_get(&svsk->sk_xprt); |
aaf68cfb N |
1961 | svc_delete_socket(svsk); |
1962 | clear_bit(SK_BUSY, &svsk->sk_flags); | |
e1b3157f | 1963 | svc_xprt_put(&svsk->sk_xprt); |
1da177e4 LT |
1964 | } |
1965 | ||
cda1fd4a N |
1966 | void svc_force_close_socket(struct svc_sock *svsk) |
1967 | { | |
1968 | set_bit(SK_CLOSE, &svsk->sk_flags); | |
1969 | if (test_bit(SK_BUSY, &svsk->sk_flags)) { | |
1970 | /* Waiting to be processed, but no threads left, | |
1971 | * So just remove it from the waiting list | |
1972 | */ | |
1973 | list_del_init(&svsk->sk_ready); | |
1974 | clear_bit(SK_BUSY, &svsk->sk_flags); | |
1975 | } | |
1976 | svc_close_socket(svsk); | |
1977 | } | |
1978 | ||
1da177e4 | 1979 | /* |
cca5172a | 1980 | * Handle defer and revisit of requests |
1da177e4 LT |
1981 | */ |
1982 | ||
1983 | static void svc_revisit(struct cache_deferred_req *dreq, int too_many) | |
1984 | { | |
1985 | struct svc_deferred_req *dr = container_of(dreq, struct svc_deferred_req, handle); | |
1da177e4 LT |
1986 | struct svc_sock *svsk; |
1987 | ||
1988 | if (too_many) { | |
e1b3157f | 1989 | svc_xprt_put(&dr->svsk->sk_xprt); |
1da177e4 LT |
1990 | kfree(dr); |
1991 | return; | |
1992 | } | |
1993 | dprintk("revisit queued\n"); | |
1994 | svsk = dr->svsk; | |
1995 | dr->svsk = NULL; | |
7ac1bea5 | 1996 | spin_lock(&svsk->sk_lock); |
1da177e4 | 1997 | list_add(&dr->handle.recent, &svsk->sk_deferred); |
7ac1bea5 | 1998 | spin_unlock(&svsk->sk_lock); |
1da177e4 LT |
1999 | set_bit(SK_DEFERRED, &svsk->sk_flags); |
2000 | svc_sock_enqueue(svsk); | |
e1b3157f | 2001 | svc_xprt_put(&svsk->sk_xprt); |
1da177e4 LT |
2002 | } |
2003 | ||
2004 | static struct cache_deferred_req * | |
2005 | svc_defer(struct cache_req *req) | |
2006 | { | |
2007 | struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); | |
2008 | int size = sizeof(struct svc_deferred_req) + (rqstp->rq_arg.len); | |
2009 | struct svc_deferred_req *dr; | |
2010 | ||
2011 | if (rqstp->rq_arg.page_len) | |
2012 | return NULL; /* if more than a page, give up FIXME */ | |
2013 | if (rqstp->rq_deferred) { | |
2014 | dr = rqstp->rq_deferred; | |
2015 | rqstp->rq_deferred = NULL; | |
2016 | } else { | |
2017 | int skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
2018 | /* FIXME maybe discard if size too large */ | |
2019 | dr = kmalloc(size, GFP_KERNEL); | |
2020 | if (dr == NULL) | |
2021 | return NULL; | |
2022 | ||
2023 | dr->handle.owner = rqstp->rq_server; | |
2024 | dr->prot = rqstp->rq_prot; | |
24422222 CL |
2025 | memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); |
2026 | dr->addrlen = rqstp->rq_addrlen; | |
1918e341 | 2027 | dr->daddr = rqstp->rq_daddr; |
1da177e4 LT |
2028 | dr->argslen = rqstp->rq_arg.len >> 2; |
2029 | memcpy(dr->args, rqstp->rq_arg.head[0].iov_base-skip, dr->argslen<<2); | |
2030 | } | |
e1b3157f | 2031 | svc_xprt_get(rqstp->rq_xprt); |
1da177e4 | 2032 | dr->svsk = rqstp->rq_sock; |
1da177e4 LT |
2033 | |
2034 | dr->handle.revisit = svc_revisit; | |
2035 | return &dr->handle; | |
2036 | } | |
2037 | ||
2038 | /* | |
2039 | * recv data from a deferred request into an active one | |
2040 | */ | |
2041 | static int svc_deferred_recv(struct svc_rqst *rqstp) | |
2042 | { | |
2043 | struct svc_deferred_req *dr = rqstp->rq_deferred; | |
2044 | ||
2045 | rqstp->rq_arg.head[0].iov_base = dr->args; | |
2046 | rqstp->rq_arg.head[0].iov_len = dr->argslen<<2; | |
2047 | rqstp->rq_arg.page_len = 0; | |
2048 | rqstp->rq_arg.len = dr->argslen<<2; | |
2049 | rqstp->rq_prot = dr->prot; | |
24422222 CL |
2050 | memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); |
2051 | rqstp->rq_addrlen = dr->addrlen; | |
1918e341 | 2052 | rqstp->rq_daddr = dr->daddr; |
44524359 | 2053 | rqstp->rq_respages = rqstp->rq_pages; |
1da177e4 LT |
2054 | return dr->argslen<<2; |
2055 | } | |
2056 | ||
2057 | ||
2058 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk) | |
2059 | { | |
2060 | struct svc_deferred_req *dr = NULL; | |
cca5172a | 2061 | |
1da177e4 LT |
2062 | if (!test_bit(SK_DEFERRED, &svsk->sk_flags)) |
2063 | return NULL; | |
7ac1bea5 | 2064 | spin_lock(&svsk->sk_lock); |
1da177e4 LT |
2065 | clear_bit(SK_DEFERRED, &svsk->sk_flags); |
2066 | if (!list_empty(&svsk->sk_deferred)) { | |
2067 | dr = list_entry(svsk->sk_deferred.next, | |
2068 | struct svc_deferred_req, | |
2069 | handle.recent); | |
2070 | list_del_init(&dr->handle.recent); | |
2071 | set_bit(SK_DEFERRED, &svsk->sk_flags); | |
2072 | } | |
7ac1bea5 | 2073 | spin_unlock(&svsk->sk_lock); |
1da177e4 LT |
2074 | return dr; |
2075 | } |