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 | |
f6150c3c | 8 | * svc_xprt_enqueue procedure... |
1da177e4 LT |
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. | |
02fc6c36 TT |
59 | * svc_sock->sk_xprt.xpt_flags.XPT_BUSY prevents a svc_sock being |
60 | * enqueued multiply. | |
1da177e4 LT |
61 | * |
62 | * Some flags can be set to certain values at any time | |
63 | * providing that certain rules are followed: | |
64 | * | |
02fc6c36 | 65 | * XPT_CONN, XPT_DATA, can be set or cleared at any time. |
f6150c3c | 66 | * after a set, svc_xprt_enqueue must be called. |
1da177e4 LT |
67 | * after a clear, the socket must be read/accepted |
68 | * if this succeeds, it must be set again. | |
02fc6c36 TT |
69 | * XPT_CLOSE can set at any time. It is never cleared. |
70 | * xpt_ref contains a bias of '1' until XPT_DEAD is set. | |
e1b3157f | 71 | * so when xprt_ref hits zero, we know the transport is dead |
aaf68cfb | 72 | * and no-one is using it. |
02fc6c36 | 73 | * XPT_DEAD can only be set while XPT_BUSY is held which ensures |
aaf68cfb | 74 | * no other thread will be using the socket or will try to |
02fc6c36 | 75 | * set XPT_DEAD. |
1da177e4 LT |
76 | * |
77 | */ | |
78 | ||
360d8738 | 79 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
80 | |
81 | ||
82 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 83 | int *errp, int flags); |
7a182083 | 84 | static void svc_delete_xprt(struct svc_xprt *xprt); |
1da177e4 LT |
85 | static void svc_udp_data_ready(struct sock *, int); |
86 | static int svc_udp_recvfrom(struct svc_rqst *); | |
87 | static int svc_udp_sendto(struct svc_rqst *); | |
7a182083 | 88 | static void svc_close_xprt(struct svc_xprt *xprt); |
755cceab TT |
89 | static void svc_sock_detach(struct svc_xprt *); |
90 | static void svc_sock_free(struct svc_xprt *); | |
1da177e4 | 91 | |
8c7b0172 | 92 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt); |
1da177e4 LT |
93 | static int svc_deferred_recv(struct svc_rqst *rqstp); |
94 | static struct cache_deferred_req *svc_defer(struct cache_req *req); | |
b700cbb1 TT |
95 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
96 | struct sockaddr *, int, int); | |
4e5caaa5 | 97 | static void svc_age_temp_xprts(unsigned long closure); |
1da177e4 | 98 | |
36bdfc8b GB |
99 | /* apparently the "standard" is that clients close |
100 | * idle connections after 5 minutes, servers after | |
101 | * 6 minutes | |
102 | * http://www.connectathon.org/talks96/nfstcp.pdf | |
103 | */ | |
104 | static int svc_conn_age_period = 6*60; | |
105 | ||
ed07536e PZ |
106 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
107 | static struct lock_class_key svc_key[2]; | |
108 | static struct lock_class_key svc_slock_key[2]; | |
109 | ||
110 | static inline void svc_reclassify_socket(struct socket *sock) | |
111 | { | |
112 | struct sock *sk = sock->sk; | |
02b3d346 | 113 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
114 | switch (sk->sk_family) { |
115 | case AF_INET: | |
116 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
117 | &svc_slock_key[0], |
118 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
119 | &svc_key[0]); | |
ed07536e PZ |
120 | break; |
121 | ||
122 | case AF_INET6: | |
123 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
124 | &svc_slock_key[1], |
125 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
126 | &svc_key[1]); | |
ed07536e PZ |
127 | break; |
128 | ||
129 | default: | |
130 | BUG(); | |
131 | } | |
132 | } | |
133 | #else | |
134 | static inline void svc_reclassify_socket(struct socket *sock) | |
135 | { | |
136 | } | |
137 | #endif | |
138 | ||
ad06e4bd CL |
139 | static char *__svc_print_addr(struct sockaddr *addr, char *buf, size_t len) |
140 | { | |
141 | switch (addr->sa_family) { | |
142 | case AF_INET: | |
143 | snprintf(buf, len, "%u.%u.%u.%u, port=%u", | |
144 | NIPQUAD(((struct sockaddr_in *) addr)->sin_addr), | |
582ee43d | 145 | ntohs(((struct sockaddr_in *) addr)->sin_port)); |
ad06e4bd | 146 | break; |
5a05ed73 | 147 | |
ad06e4bd CL |
148 | case AF_INET6: |
149 | snprintf(buf, len, "%x:%x:%x:%x:%x:%x:%x:%x, port=%u", | |
150 | NIP6(((struct sockaddr_in6 *) addr)->sin6_addr), | |
582ee43d | 151 | ntohs(((struct sockaddr_in6 *) addr)->sin6_port)); |
ad06e4bd | 152 | break; |
5a05ed73 | 153 | |
ad06e4bd CL |
154 | default: |
155 | snprintf(buf, len, "unknown address type: %d", addr->sa_family); | |
156 | break; | |
157 | } | |
158 | return buf; | |
159 | } | |
160 | ||
161 | /** | |
162 | * svc_print_addr - Format rq_addr field for printing | |
163 | * @rqstp: svc_rqst struct containing address to print | |
164 | * @buf: target buffer for formatted address | |
165 | * @len: length of target buffer | |
166 | * | |
167 | */ | |
168 | char *svc_print_addr(struct svc_rqst *rqstp, char *buf, size_t len) | |
169 | { | |
27459f09 | 170 | return __svc_print_addr(svc_addr(rqstp), buf, len); |
ad06e4bd CL |
171 | } |
172 | EXPORT_SYMBOL_GPL(svc_print_addr); | |
173 | ||
1da177e4 | 174 | /* |
3262c816 | 175 | * Queue up an idle server thread. Must have pool->sp_lock held. |
1da177e4 | 176 | * Note: this is really a stack rather than a queue, so that we only |
3262c816 | 177 | * use as many different threads as we need, and the rest don't pollute |
1da177e4 LT |
178 | * the cache. |
179 | */ | |
180 | static inline void | |
3262c816 | 181 | svc_thread_enqueue(struct svc_pool *pool, struct svc_rqst *rqstp) |
1da177e4 | 182 | { |
3262c816 | 183 | list_add(&rqstp->rq_list, &pool->sp_threads); |
1da177e4 LT |
184 | } |
185 | ||
186 | /* | |
3262c816 | 187 | * Dequeue an nfsd thread. Must have pool->sp_lock held. |
1da177e4 LT |
188 | */ |
189 | static inline void | |
3262c816 | 190 | svc_thread_dequeue(struct svc_pool *pool, struct svc_rqst *rqstp) |
1da177e4 LT |
191 | { |
192 | list_del(&rqstp->rq_list); | |
193 | } | |
194 | ||
195 | /* | |
196 | * Release an skbuff after use | |
197 | */ | |
5148bf4e | 198 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 199 | { |
5148bf4e | 200 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
201 | struct svc_deferred_req *dr = rqstp->rq_deferred; |
202 | ||
203 | if (skb) { | |
57b1d3ba TT |
204 | struct svc_sock *svsk = |
205 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 206 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
207 | |
208 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
57b1d3ba | 209 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
210 | } |
211 | if (dr) { | |
212 | rqstp->rq_deferred = NULL; | |
213 | kfree(dr); | |
214 | } | |
215 | } | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * Queue up a socket with data pending. If there are idle nfsd | |
219 | * processes, wake 'em up. | |
220 | * | |
221 | */ | |
f6150c3c | 222 | void svc_xprt_enqueue(struct svc_xprt *xprt) |
1da177e4 | 223 | { |
f6150c3c | 224 | struct svc_serv *serv = xprt->xpt_server; |
bfd24160 | 225 | struct svc_pool *pool; |
1da177e4 | 226 | struct svc_rqst *rqstp; |
bfd24160 | 227 | int cpu; |
1da177e4 | 228 | |
f6150c3c | 229 | if (!(xprt->xpt_flags & |
02fc6c36 | 230 | ((1<<XPT_CONN)|(1<<XPT_DATA)|(1<<XPT_CLOSE)|(1<<XPT_DEFERRED)))) |
1da177e4 | 231 | return; |
f6150c3c | 232 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) |
1da177e4 LT |
233 | return; |
234 | ||
bfd24160 | 235 | cpu = get_cpu(); |
f6150c3c | 236 | pool = svc_pool_for_cpu(xprt->xpt_server, cpu); |
bfd24160 GB |
237 | put_cpu(); |
238 | ||
3262c816 | 239 | spin_lock_bh(&pool->sp_lock); |
1da177e4 | 240 | |
3262c816 GB |
241 | if (!list_empty(&pool->sp_threads) && |
242 | !list_empty(&pool->sp_sockets)) | |
1da177e4 | 243 | printk(KERN_ERR |
f6150c3c TT |
244 | "svc_xprt_enqueue: " |
245 | "threads and transports both waiting??\n"); | |
1da177e4 | 246 | |
f6150c3c | 247 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) { |
1da177e4 | 248 | /* Don't enqueue dead sockets */ |
f6150c3c | 249 | dprintk("svc: transport %p is dead, not enqueued\n", xprt); |
1da177e4 LT |
250 | goto out_unlock; |
251 | } | |
252 | ||
c081a0c7 GB |
253 | /* Mark socket as busy. It will remain in this state until the |
254 | * server has processed all pending data and put the socket back | |
02fc6c36 | 255 | * on the idle list. We update XPT_BUSY atomically because |
c081a0c7 GB |
256 | * it also guards against trying to enqueue the svc_sock twice. |
257 | */ | |
f6150c3c | 258 | if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) { |
c081a0c7 | 259 | /* Don't enqueue socket while already enqueued */ |
f6150c3c | 260 | dprintk("svc: transport %p busy, not enqueued\n", xprt); |
1da177e4 LT |
261 | goto out_unlock; |
262 | } | |
f6150c3c TT |
263 | BUG_ON(xprt->xpt_pool != NULL); |
264 | xprt->xpt_pool = pool; | |
1da177e4 | 265 | |
323bee32 | 266 | /* Handle pending connection */ |
f6150c3c | 267 | if (test_bit(XPT_CONN, &xprt->xpt_flags)) |
323bee32 TT |
268 | goto process; |
269 | ||
270 | /* Handle close in-progress */ | |
f6150c3c | 271 | if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) |
323bee32 TT |
272 | goto process; |
273 | ||
274 | /* Check if we have space to reply to a request */ | |
f6150c3c | 275 | if (!xprt->xpt_ops->xpo_has_wspace(xprt)) { |
1da177e4 | 276 | /* Don't enqueue while not enough space for reply */ |
f6150c3c TT |
277 | dprintk("svc: no write space, transport %p not enqueued\n", |
278 | xprt); | |
279 | xprt->xpt_pool = NULL; | |
280 | clear_bit(XPT_BUSY, &xprt->xpt_flags); | |
1da177e4 LT |
281 | goto out_unlock; |
282 | } | |
1da177e4 | 283 | |
323bee32 | 284 | process: |
3262c816 GB |
285 | if (!list_empty(&pool->sp_threads)) { |
286 | rqstp = list_entry(pool->sp_threads.next, | |
1da177e4 LT |
287 | struct svc_rqst, |
288 | rq_list); | |
f6150c3c TT |
289 | dprintk("svc: transport %p served by daemon %p\n", |
290 | xprt, rqstp); | |
3262c816 | 291 | svc_thread_dequeue(pool, rqstp); |
f6150c3c | 292 | if (rqstp->rq_xprt) |
cca5172a | 293 | printk(KERN_ERR |
f6150c3c TT |
294 | "svc_xprt_enqueue: server %p, rq_xprt=%p!\n", |
295 | rqstp, rqstp->rq_xprt); | |
296 | rqstp->rq_xprt = xprt; | |
297 | svc_xprt_get(xprt); | |
c6b0a9f8 | 298 | rqstp->rq_reserved = serv->sv_max_mesg; |
f6150c3c TT |
299 | atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); |
300 | BUG_ON(xprt->xpt_pool != pool); | |
1da177e4 LT |
301 | wake_up(&rqstp->rq_wait); |
302 | } else { | |
f6150c3c TT |
303 | dprintk("svc: transport %p put into queue\n", xprt); |
304 | list_add_tail(&xprt->xpt_ready, &pool->sp_sockets); | |
305 | BUG_ON(xprt->xpt_pool != pool); | |
1da177e4 LT |
306 | } |
307 | ||
308 | out_unlock: | |
3262c816 | 309 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 | 310 | } |
f6150c3c | 311 | EXPORT_SYMBOL_GPL(svc_xprt_enqueue); |
1da177e4 LT |
312 | |
313 | /* | |
3262c816 | 314 | * Dequeue the first socket. Must be called with the pool->sp_lock held. |
1da177e4 | 315 | */ |
c36adb2a | 316 | static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool) |
1da177e4 | 317 | { |
c36adb2a | 318 | struct svc_xprt *xprt; |
1da177e4 | 319 | |
3262c816 | 320 | if (list_empty(&pool->sp_sockets)) |
1da177e4 LT |
321 | return NULL; |
322 | ||
c36adb2a TT |
323 | xprt = list_entry(pool->sp_sockets.next, |
324 | struct svc_xprt, xpt_ready); | |
325 | list_del_init(&xprt->xpt_ready); | |
1da177e4 | 326 | |
c36adb2a TT |
327 | dprintk("svc: transport %p dequeued, inuse=%d\n", |
328 | xprt, atomic_read(&xprt->xpt_ref.refcount)); | |
1da177e4 | 329 | |
c36adb2a | 330 | return xprt; |
1da177e4 LT |
331 | } |
332 | ||
333 | /* | |
a6046f71 TT |
334 | * svc_xprt_received conditionally queues the transport for processing |
335 | * by another thread. The caller must hold the XPT_BUSY bit and must | |
336 | * not thereafter touch transport data. | |
337 | * | |
338 | * Note: XPT_DATA only gets cleared when a read-attempt finds no (or | |
339 | * insufficient) data. | |
1da177e4 | 340 | */ |
a6046f71 | 341 | void svc_xprt_received(struct svc_xprt *xprt) |
1da177e4 | 342 | { |
a6046f71 TT |
343 | BUG_ON(!test_bit(XPT_BUSY, &xprt->xpt_flags)); |
344 | xprt->xpt_pool = NULL; | |
345 | clear_bit(XPT_BUSY, &xprt->xpt_flags); | |
346 | svc_xprt_enqueue(xprt); | |
1da177e4 | 347 | } |
a6046f71 | 348 | EXPORT_SYMBOL_GPL(svc_xprt_received); |
1da177e4 LT |
349 | |
350 | /** | |
351 | * svc_reserve - change the space reserved for the reply to a request. | |
352 | * @rqstp: The request in question | |
353 | * @space: new max space to reserve | |
354 | * | |
355 | * Each request reserves some space on the output queue of the socket | |
356 | * to make sure the reply fits. This function reduces that reserved | |
357 | * space to be the amount of space used already, plus @space. | |
358 | * | |
359 | */ | |
360 | void svc_reserve(struct svc_rqst *rqstp, int space) | |
361 | { | |
362 | space += rqstp->rq_res.head[0].iov_len; | |
363 | ||
364 | if (space < rqstp->rq_reserved) { | |
f6150c3c TT |
365 | struct svc_xprt *xprt = rqstp->rq_xprt; |
366 | atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved); | |
1da177e4 | 367 | rqstp->rq_reserved = space; |
1da177e4 | 368 | |
f6150c3c | 369 | svc_xprt_enqueue(xprt); |
1da177e4 LT |
370 | } |
371 | } | |
372 | ||
eab996d4 | 373 | static void svc_xprt_release(struct svc_rqst *rqstp) |
1da177e4 | 374 | { |
eab996d4 | 375 | struct svc_xprt *xprt = rqstp->rq_xprt; |
1da177e4 | 376 | |
5148bf4e | 377 | rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); |
1da177e4 | 378 | |
44524359 | 379 | svc_free_res_pages(rqstp); |
1da177e4 LT |
380 | rqstp->rq_res.page_len = 0; |
381 | rqstp->rq_res.page_base = 0; | |
382 | ||
1da177e4 LT |
383 | /* Reset response buffer and release |
384 | * the reservation. | |
385 | * But first, check that enough space was reserved | |
386 | * for the reply, otherwise we have a bug! | |
387 | */ | |
388 | if ((rqstp->rq_res.len) > rqstp->rq_reserved) | |
389 | printk(KERN_ERR "RPC request reserved %d but used %d\n", | |
390 | rqstp->rq_reserved, | |
391 | rqstp->rq_res.len); | |
392 | ||
393 | rqstp->rq_res.head[0].iov_len = 0; | |
394 | svc_reserve(rqstp, 0); | |
eab996d4 | 395 | rqstp->rq_xprt = NULL; |
1da177e4 | 396 | |
eab996d4 | 397 | svc_xprt_put(xprt); |
1da177e4 LT |
398 | } |
399 | ||
400 | /* | |
401 | * External function to wake up a server waiting for data | |
3262c816 GB |
402 | * This really only makes sense for services like lockd |
403 | * which have exactly one thread anyway. | |
1da177e4 LT |
404 | */ |
405 | void | |
406 | svc_wake_up(struct svc_serv *serv) | |
407 | { | |
408 | struct svc_rqst *rqstp; | |
3262c816 GB |
409 | unsigned int i; |
410 | struct svc_pool *pool; | |
411 | ||
412 | for (i = 0; i < serv->sv_nrpools; i++) { | |
413 | pool = &serv->sv_pools[i]; | |
414 | ||
415 | spin_lock_bh(&pool->sp_lock); | |
416 | if (!list_empty(&pool->sp_threads)) { | |
417 | rqstp = list_entry(pool->sp_threads.next, | |
418 | struct svc_rqst, | |
419 | rq_list); | |
420 | dprintk("svc: daemon %p woken up.\n", rqstp); | |
421 | /* | |
422 | svc_thread_dequeue(pool, rqstp); | |
57b1d3ba | 423 | rqstp->rq_xprt = NULL; |
3262c816 GB |
424 | */ |
425 | wake_up(&rqstp->rq_wait); | |
426 | } | |
427 | spin_unlock_bh(&pool->sp_lock); | |
1da177e4 | 428 | } |
1da177e4 LT |
429 | } |
430 | ||
b92503b2 CL |
431 | union svc_pktinfo_u { |
432 | struct in_pktinfo pkti; | |
b92503b2 | 433 | struct in6_pktinfo pkti6; |
b92503b2 | 434 | }; |
bc375ea7 DM |
435 | #define SVC_PKTINFO_SPACE \ |
436 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
437 | |
438 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
439 | { | |
57b1d3ba TT |
440 | struct svc_sock *svsk = |
441 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
442 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
443 | case AF_INET: { |
444 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
445 | ||
446 | cmh->cmsg_level = SOL_IP; | |
447 | cmh->cmsg_type = IP_PKTINFO; | |
448 | pki->ipi_ifindex = 0; | |
449 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
450 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
451 | } | |
452 | break; | |
5a05ed73 | 453 | |
b92503b2 CL |
454 | case AF_INET6: { |
455 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
456 | ||
457 | cmh->cmsg_level = SOL_IPV6; | |
458 | cmh->cmsg_type = IPV6_PKTINFO; | |
459 | pki->ipi6_ifindex = 0; | |
460 | ipv6_addr_copy(&pki->ipi6_addr, | |
461 | &rqstp->rq_daddr.addr6); | |
462 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
463 | } | |
464 | break; | |
b92503b2 CL |
465 | } |
466 | return; | |
467 | } | |
468 | ||
1da177e4 LT |
469 | /* |
470 | * Generic sendto routine | |
471 | */ | |
472 | static int | |
473 | svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
474 | { | |
57b1d3ba TT |
475 | struct svc_sock *svsk = |
476 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1da177e4 LT |
477 | struct socket *sock = svsk->sk_sock; |
478 | int slen; | |
bc375ea7 DM |
479 | union { |
480 | struct cmsghdr hdr; | |
481 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
482 | } buffer; | |
483 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 LT |
484 | int len = 0; |
485 | int result; | |
486 | int size; | |
487 | struct page **ppage = xdr->pages; | |
488 | size_t base = xdr->page_base; | |
489 | unsigned int pglen = xdr->page_len; | |
490 | unsigned int flags = MSG_MORE; | |
ad06e4bd | 491 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
492 | |
493 | slen = xdr->len; | |
494 | ||
495 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
b92503b2 CL |
496 | struct msghdr msg = { |
497 | .msg_name = &rqstp->rq_addr, | |
498 | .msg_namelen = rqstp->rq_addrlen, | |
499 | .msg_control = cmh, | |
500 | .msg_controllen = sizeof(buffer), | |
501 | .msg_flags = MSG_MORE, | |
502 | }; | |
503 | ||
504 | svc_set_cmsg_data(rqstp, cmh); | |
1da177e4 LT |
505 | |
506 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
507 | goto out; | |
508 | } | |
509 | ||
510 | /* send head */ | |
511 | if (slen == xdr->head[0].iov_len) | |
512 | flags = 0; | |
44524359 N |
513 | len = kernel_sendpage(sock, rqstp->rq_respages[0], 0, |
514 | xdr->head[0].iov_len, flags); | |
1da177e4 LT |
515 | if (len != xdr->head[0].iov_len) |
516 | goto out; | |
517 | slen -= xdr->head[0].iov_len; | |
518 | if (slen == 0) | |
519 | goto out; | |
520 | ||
521 | /* send page data */ | |
522 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
523 | while (pglen > 0) { | |
524 | if (slen == size) | |
525 | flags = 0; | |
e6242e92 | 526 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
527 | if (result > 0) |
528 | len += result; | |
529 | if (result != size) | |
530 | goto out; | |
531 | slen -= size; | |
532 | pglen -= size; | |
533 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
534 | base = 0; | |
535 | ppage++; | |
536 | } | |
537 | /* send tail */ | |
538 | if (xdr->tail[0].iov_len) { | |
44524359 N |
539 | result = kernel_sendpage(sock, rqstp->rq_respages[0], |
540 | ((unsigned long)xdr->tail[0].iov_base) | |
cca5172a | 541 | & (PAGE_SIZE-1), |
1da177e4 LT |
542 | xdr->tail[0].iov_len, 0); |
543 | ||
544 | if (result > 0) | |
545 | len += result; | |
546 | } | |
547 | out: | |
ad06e4bd | 548 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 549 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 550 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
551 | |
552 | return len; | |
553 | } | |
554 | ||
80212d59 N |
555 | /* |
556 | * Report socket names for nfsdfs | |
557 | */ | |
558 | static int one_sock_name(char *buf, struct svc_sock *svsk) | |
559 | { | |
560 | int len; | |
561 | ||
562 | switch(svsk->sk_sk->sk_family) { | |
563 | case AF_INET: | |
564 | len = sprintf(buf, "ipv4 %s %u.%u.%u.%u %d\n", | |
565 | svsk->sk_sk->sk_protocol==IPPROTO_UDP? | |
566 | "udp" : "tcp", | |
567 | NIPQUAD(inet_sk(svsk->sk_sk)->rcv_saddr), | |
568 | inet_sk(svsk->sk_sk)->num); | |
569 | break; | |
570 | default: | |
571 | len = sprintf(buf, "*unknown-%d*\n", | |
572 | svsk->sk_sk->sk_family); | |
573 | } | |
574 | return len; | |
575 | } | |
576 | ||
577 | int | |
b41b66d6 | 578 | svc_sock_names(char *buf, struct svc_serv *serv, char *toclose) |
80212d59 | 579 | { |
b41b66d6 | 580 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
581 | int len = 0; |
582 | ||
583 | if (!serv) | |
584 | return 0; | |
aaf68cfb | 585 | spin_lock_bh(&serv->sv_lock); |
7a182083 | 586 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
80212d59 | 587 | int onelen = one_sock_name(buf+len, svsk); |
b41b66d6 N |
588 | if (toclose && strcmp(toclose, buf+len) == 0) |
589 | closesk = svsk; | |
590 | else | |
591 | len += onelen; | |
80212d59 | 592 | } |
aaf68cfb | 593 | spin_unlock_bh(&serv->sv_lock); |
b41b66d6 | 594 | if (closesk) |
5680c446 N |
595 | /* Should unregister with portmap, but you cannot |
596 | * unregister just one protocol... | |
597 | */ | |
7a182083 | 598 | svc_close_xprt(&closesk->sk_xprt); |
37a03472 N |
599 | else if (toclose) |
600 | return -ENOENT; | |
80212d59 N |
601 | return len; |
602 | } | |
603 | EXPORT_SYMBOL(svc_sock_names); | |
604 | ||
1da177e4 LT |
605 | /* |
606 | * Check input queue length | |
607 | */ | |
608 | static int | |
609 | svc_recv_available(struct svc_sock *svsk) | |
610 | { | |
1da177e4 LT |
611 | struct socket *sock = svsk->sk_sock; |
612 | int avail, err; | |
613 | ||
e6242e92 | 614 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
615 | |
616 | return (err >= 0)? avail : err; | |
617 | } | |
618 | ||
619 | /* | |
620 | * Generic recvfrom routine. | |
621 | */ | |
622 | static int | |
623 | svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, int buflen) | |
624 | { | |
57b1d3ba TT |
625 | struct svc_sock *svsk = |
626 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
627 | struct msghdr msg = { |
628 | .msg_flags = MSG_DONTWAIT, | |
629 | }; | |
630 | int len; | |
1da177e4 | 631 | |
1ba95105 CL |
632 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
633 | msg.msg_flags); | |
1da177e4 | 634 | |
1da177e4 | 635 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 636 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
637 | return len; |
638 | } | |
639 | ||
640 | /* | |
641 | * Set socket snd and rcv buffer lengths | |
642 | */ | |
643 | static inline void | |
644 | svc_sock_setbufsize(struct socket *sock, unsigned int snd, unsigned int rcv) | |
645 | { | |
646 | #if 0 | |
647 | mm_segment_t oldfs; | |
648 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
649 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
650 | (char*)&snd, sizeof(snd)); | |
651 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
652 | (char*)&rcv, sizeof(rcv)); | |
653 | #else | |
654 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
655 | * which isn't acceptable. Until that is made conditional | |
656 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
657 | * DaveM said I could! | |
658 | */ | |
659 | lock_sock(sock->sk); | |
660 | sock->sk->sk_sndbuf = snd * 2; | |
661 | sock->sk->sk_rcvbuf = rcv * 2; | |
662 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; | |
663 | release_sock(sock->sk); | |
664 | #endif | |
665 | } | |
666 | /* | |
667 | * INET callback when data has been received on the socket. | |
668 | */ | |
669 | static void | |
670 | svc_udp_data_ready(struct sock *sk, int count) | |
671 | { | |
939bb7ef | 672 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 673 | |
939bb7ef NB |
674 | if (svsk) { |
675 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
676 | svsk, sk, count, |
677 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
678 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 679 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 680 | } |
1da177e4 LT |
681 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
682 | wake_up_interruptible(sk->sk_sleep); | |
683 | } | |
684 | ||
685 | /* | |
686 | * INET callback when space is newly available on the socket. | |
687 | */ | |
688 | static void | |
689 | svc_write_space(struct sock *sk) | |
690 | { | |
691 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
692 | ||
693 | if (svsk) { | |
694 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 695 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 696 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
697 | } |
698 | ||
699 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) { | |
939bb7ef | 700 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 LT |
701 | svsk); |
702 | wake_up_interruptible(sk->sk_sleep); | |
703 | } | |
704 | } | |
705 | ||
9dbc240f TT |
706 | /* |
707 | * Copy the UDP datagram's destination address to the rqstp structure. | |
708 | * The 'destination' address in this case is the address to which the | |
709 | * peer sent the datagram, i.e. our local address. For multihomed | |
710 | * hosts, this can change from msg to msg. Note that only the IP | |
711 | * address changes, the port number should remain the same. | |
712 | */ | |
713 | static void svc_udp_get_dest_address(struct svc_rqst *rqstp, | |
714 | struct cmsghdr *cmh) | |
95756482 | 715 | { |
57b1d3ba TT |
716 | struct svc_sock *svsk = |
717 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
718 | switch (svsk->sk_sk->sk_family) { | |
95756482 | 719 | case AF_INET: { |
7a37f578 N |
720 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
721 | rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; | |
95756482 | 722 | break; |
7a37f578 | 723 | } |
95756482 | 724 | case AF_INET6: { |
7a37f578 N |
725 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
726 | ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); | |
95756482 | 727 | break; |
7a37f578 | 728 | } |
95756482 | 729 | } |
95756482 CL |
730 | } |
731 | ||
1da177e4 LT |
732 | /* |
733 | * Receive a datagram from a UDP socket. | |
734 | */ | |
1da177e4 LT |
735 | static int |
736 | svc_udp_recvfrom(struct svc_rqst *rqstp) | |
737 | { | |
57b1d3ba TT |
738 | struct svc_sock *svsk = |
739 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 740 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 741 | struct sk_buff *skb; |
bc375ea7 DM |
742 | union { |
743 | struct cmsghdr hdr; | |
744 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
745 | } buffer; | |
746 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 | 747 | int err, len; |
7a37f578 N |
748 | struct msghdr msg = { |
749 | .msg_name = svc_addr(rqstp), | |
750 | .msg_control = cmh, | |
751 | .msg_controllen = sizeof(buffer), | |
752 | .msg_flags = MSG_DONTWAIT, | |
753 | }; | |
1da177e4 | 754 | |
02fc6c36 | 755 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
756 | /* udp sockets need large rcvbuf as all pending |
757 | * requests are still in that buffer. sndbuf must | |
758 | * also be large enough that there is enough space | |
3262c816 GB |
759 | * for one reply per thread. We count all threads |
760 | * rather than threads in a particular pool, which | |
761 | * provides an upper bound on the number of threads | |
762 | * which will access the socket. | |
1da177e4 LT |
763 | */ |
764 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
765 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
766 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 767 | |
02fc6c36 | 768 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
769 | skb = NULL; |
770 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
771 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
772 | if (err >= 0) | |
773 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
774 | ||
775 | if (skb == NULL) { | |
776 | if (err != -EAGAIN) { | |
777 | /* possibly an icmp error */ | |
778 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 779 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 780 | } |
a6046f71 | 781 | svc_xprt_received(&svsk->sk_xprt); |
05ed690e | 782 | return -EAGAIN; |
1da177e4 | 783 | } |
9dbc240f TT |
784 | len = svc_addr_len(svc_addr(rqstp)); |
785 | if (len < 0) | |
786 | return len; | |
787 | rqstp->rq_addrlen = len; | |
b7aa0bf7 ED |
788 | if (skb->tstamp.tv64 == 0) { |
789 | skb->tstamp = ktime_get_real(); | |
cca5172a | 790 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
791 | need that much accuracy */ |
792 | } | |
b7aa0bf7 | 793 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 794 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 LT |
795 | |
796 | /* | |
797 | * Maybe more packets - kick another thread ASAP. | |
798 | */ | |
a6046f71 | 799 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
800 | |
801 | len = skb->len - sizeof(struct udphdr); | |
802 | rqstp->rq_arg.len = len; | |
803 | ||
95756482 | 804 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 805 | |
7a37f578 N |
806 | if (cmh->cmsg_level != IPPROTO_IP || |
807 | cmh->cmsg_type != IP_PKTINFO) { | |
808 | if (net_ratelimit()) | |
809 | printk("rpcsvc: received unknown control message:" | |
810 | "%d/%d\n", | |
811 | cmh->cmsg_level, cmh->cmsg_type); | |
812 | skb_free_datagram(svsk->sk_sk, skb); | |
813 | return 0; | |
814 | } | |
815 | svc_udp_get_dest_address(rqstp, cmh); | |
1da177e4 LT |
816 | |
817 | if (skb_is_nonlinear(skb)) { | |
818 | /* we have to copy */ | |
819 | local_bh_disable(); | |
820 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
821 | local_bh_enable(); | |
822 | /* checksum error */ | |
823 | skb_free_datagram(svsk->sk_sk, skb); | |
824 | return 0; | |
825 | } | |
826 | local_bh_enable(); | |
cca5172a | 827 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
828 | } else { |
829 | /* we can use it in-place */ | |
830 | rqstp->rq_arg.head[0].iov_base = skb->data + sizeof(struct udphdr); | |
831 | rqstp->rq_arg.head[0].iov_len = len; | |
fb286bb2 HX |
832 | if (skb_checksum_complete(skb)) { |
833 | skb_free_datagram(svsk->sk_sk, skb); | |
834 | return 0; | |
1da177e4 | 835 | } |
5148bf4e | 836 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
837 | } |
838 | ||
839 | rqstp->rq_arg.page_base = 0; | |
840 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
841 | rqstp->rq_arg.head[0].iov_len = len; | |
842 | rqstp->rq_arg.page_len = 0; | |
44524359 | 843 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
844 | } else { |
845 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 846 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 847 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
848 | } |
849 | ||
850 | if (serv->sv_stats) | |
851 | serv->sv_stats->netudpcnt++; | |
852 | ||
853 | return len; | |
854 | } | |
855 | ||
856 | static int | |
857 | svc_udp_sendto(struct svc_rqst *rqstp) | |
858 | { | |
859 | int error; | |
860 | ||
861 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
862 | if (error == -ECONNREFUSED) | |
863 | /* ICMP error on earlier request. */ | |
864 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
865 | ||
866 | return error; | |
867 | } | |
868 | ||
e831fe65 TT |
869 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
870 | { | |
871 | } | |
872 | ||
323bee32 TT |
873 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
874 | { | |
875 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 876 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
877 | unsigned long required; |
878 | ||
879 | /* | |
880 | * Set the SOCK_NOSPACE flag before checking the available | |
881 | * sock space. | |
882 | */ | |
883 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 884 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
885 | if (required*2 > sock_wspace(svsk->sk_sk)) |
886 | return 0; | |
887 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
888 | return 1; | |
889 | } | |
890 | ||
38a417cc TT |
891 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
892 | { | |
893 | BUG(); | |
894 | return NULL; | |
895 | } | |
896 | ||
b700cbb1 TT |
897 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
898 | struct sockaddr *sa, int salen, | |
899 | int flags) | |
900 | { | |
901 | return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags); | |
902 | } | |
903 | ||
360d8738 | 904 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 905 | .xpo_create = svc_udp_create, |
5d137990 TT |
906 | .xpo_recvfrom = svc_udp_recvfrom, |
907 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 908 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
909 | .xpo_detach = svc_sock_detach, |
910 | .xpo_free = svc_sock_free, | |
e831fe65 | 911 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 912 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 913 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
914 | }; |
915 | ||
916 | static struct svc_xprt_class svc_udp_class = { | |
917 | .xcl_name = "udp", | |
b700cbb1 | 918 | .xcl_owner = THIS_MODULE, |
360d8738 | 919 | .xcl_ops = &svc_udp_ops, |
49023155 | 920 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
921 | }; |
922 | ||
bb5cf160 | 923 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 924 | { |
7a37f578 N |
925 | int one = 1; |
926 | mm_segment_t oldfs; | |
927 | ||
bb5cf160 | 928 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); |
def13d74 | 929 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
930 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
931 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
932 | |
933 | /* initialise setting must have enough space to | |
cca5172a | 934 | * receive and respond to one request. |
1da177e4 LT |
935 | * svc_udp_recvfrom will re-adjust if necessary |
936 | */ | |
937 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
938 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
939 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 940 | |
02fc6c36 TT |
941 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* might have come in before data_ready set up */ |
942 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); | |
7a37f578 N |
943 | |
944 | oldfs = get_fs(); | |
945 | set_fs(KERNEL_DS); | |
946 | /* make sure we get destination address info */ | |
947 | svsk->sk_sock->ops->setsockopt(svsk->sk_sock, IPPROTO_IP, IP_PKTINFO, | |
948 | (char __user *)&one, sizeof(one)); | |
949 | set_fs(oldfs); | |
1da177e4 LT |
950 | } |
951 | ||
952 | /* | |
953 | * A data_ready event on a listening socket means there's a connection | |
954 | * pending. Do not use state_change as a substitute for it. | |
955 | */ | |
956 | static void | |
957 | svc_tcp_listen_data_ready(struct sock *sk, int count_unused) | |
958 | { | |
939bb7ef | 959 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
960 | |
961 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 962 | sk, sk->sk_state); |
1da177e4 | 963 | |
939bb7ef NB |
964 | /* |
965 | * This callback may called twice when a new connection | |
966 | * is established as a child socket inherits everything | |
967 | * from a parent LISTEN socket. | |
968 | * 1) data_ready method of the parent socket will be called | |
969 | * when one of child sockets become ESTABLISHED. | |
970 | * 2) data_ready method of the child socket may be called | |
971 | * when it receives data before the socket is accepted. | |
972 | * In case of 2, we should ignore it silently. | |
973 | */ | |
974 | if (sk->sk_state == TCP_LISTEN) { | |
975 | if (svsk) { | |
02fc6c36 | 976 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 977 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
978 | } else |
979 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 980 | } |
939bb7ef | 981 | |
1da177e4 LT |
982 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
983 | wake_up_interruptible_all(sk->sk_sleep); | |
984 | } | |
985 | ||
986 | /* | |
987 | * A state change on a connected socket means it's dying or dead. | |
988 | */ | |
989 | static void | |
990 | svc_tcp_state_change(struct sock *sk) | |
991 | { | |
939bb7ef | 992 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
993 | |
994 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 995 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 996 | |
939bb7ef | 997 | if (!svsk) |
1da177e4 | 998 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 999 | else { |
02fc6c36 | 1000 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 1001 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 1002 | } |
1da177e4 LT |
1003 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
1004 | wake_up_interruptible_all(sk->sk_sleep); | |
1005 | } | |
1006 | ||
1007 | static void | |
1008 | svc_tcp_data_ready(struct sock *sk, int count) | |
1009 | { | |
939bb7ef | 1010 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
1011 | |
1012 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
1013 | sk, sk->sk_user_data); |
1014 | if (svsk) { | |
02fc6c36 | 1015 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 1016 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 1017 | } |
1da177e4 LT |
1018 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
1019 | wake_up_interruptible(sk->sk_sleep); | |
1020 | } | |
1021 | ||
bcdb81ae CL |
1022 | static inline int svc_port_is_privileged(struct sockaddr *sin) |
1023 | { | |
1024 | switch (sin->sa_family) { | |
1025 | case AF_INET: | |
1026 | return ntohs(((struct sockaddr_in *)sin)->sin_port) | |
1027 | < PROT_SOCK; | |
bcdb81ae CL |
1028 | case AF_INET6: |
1029 | return ntohs(((struct sockaddr_in6 *)sin)->sin6_port) | |
1030 | < PROT_SOCK; | |
bcdb81ae CL |
1031 | default: |
1032 | return 0; | |
1033 | } | |
1034 | } | |
1035 | ||
1da177e4 LT |
1036 | /* |
1037 | * Accept a TCP connection | |
1038 | */ | |
38a417cc | 1039 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 1040 | { |
38a417cc | 1041 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 1042 | struct sockaddr_storage addr; |
1043 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 1044 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
1045 | struct socket *sock = svsk->sk_sock; |
1046 | struct socket *newsock; | |
1da177e4 LT |
1047 | struct svc_sock *newsvsk; |
1048 | int err, slen; | |
ad06e4bd | 1049 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
1050 | |
1051 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
1052 | if (!sock) | |
38a417cc | 1053 | return NULL; |
1da177e4 | 1054 | |
02fc6c36 | 1055 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
1056 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
1057 | if (err < 0) { | |
1da177e4 LT |
1058 | if (err == -ENOMEM) |
1059 | printk(KERN_WARNING "%s: no more sockets!\n", | |
1060 | serv->sv_name); | |
e6242e92 | 1061 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
1062 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
1063 | serv->sv_name, -err); | |
38a417cc | 1064 | return NULL; |
1da177e4 | 1065 | } |
02fc6c36 | 1066 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1067 | |
cdd88b9f | 1068 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
1069 | if (err < 0) { |
1070 | if (net_ratelimit()) | |
1071 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
1072 | serv->sv_name, -err); | |
1073 | goto failed; /* aborted connection or whatever */ | |
1074 | } | |
1075 | ||
1076 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
1077 | * hosts here, but when we get encryption, the IP of the host won't |
1078 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 1079 | */ |
cdd88b9f | 1080 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 1081 | dprintk(KERN_WARNING |
ad06e4bd | 1082 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 1083 | serv->sv_name, |
cdd88b9f | 1084 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 1085 | } |
ad06e4bd | 1086 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 1087 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1088 | |
1089 | /* make sure that a write doesn't block forever when | |
1090 | * low on memory | |
1091 | */ | |
1092 | newsock->sk->sk_sndtimeo = HZ*30; | |
1093 | ||
6b174337 CL |
1094 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
1095 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 1096 | goto failed; |
9dbc240f | 1097 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, 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 | } | |
9dbc240f | 1103 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 1104 | |
f9f3cc4f TT |
1105 | if (serv->sv_stats) |
1106 | serv->sv_stats->nettcpconn++; | |
1107 | ||
1108 | return &newsvsk->sk_xprt; | |
1109 | ||
1110 | failed: | |
1111 | sock_release(newsock); | |
1112 | return NULL; | |
1113 | } | |
1114 | ||
1da177e4 LT |
1115 | /* |
1116 | * Receive data from a TCP socket. | |
1117 | */ | |
1118 | static int | |
1119 | svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1120 | { | |
57b1d3ba TT |
1121 | struct svc_sock *svsk = |
1122 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 1123 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 1124 | int len; |
3cc03b16 | 1125 | struct kvec *vec; |
1da177e4 LT |
1126 | int pnum, vlen; |
1127 | ||
1128 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
02fc6c36 TT |
1129 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), |
1130 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1131 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1da177e4 | 1132 | |
02fc6c36 | 1133 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
1134 | /* sndbuf needs to have room for one request |
1135 | * per thread, otherwise we can stall even when the | |
1136 | * network isn't a bottleneck. | |
3262c816 GB |
1137 | * |
1138 | * We count all threads rather than threads in a | |
1139 | * particular pool, which provides an upper bound | |
1140 | * on the number of threads which will access the socket. | |
1141 | * | |
1da177e4 | 1142 | * rcvbuf just needs to be able to hold a few requests. |
cca5172a | 1143 | * Normally they will be removed from the queue |
1da177e4 LT |
1144 | * as soon a a complete request arrives. |
1145 | */ | |
1146 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
1147 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
1148 | 3 * serv->sv_max_mesg); | |
1da177e4 | 1149 | |
02fc6c36 | 1150 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1151 | |
1152 | /* Receive data. If we haven't got the record length yet, get | |
1153 | * the next four bytes. Otherwise try to gobble up as much as | |
1154 | * possible up to the complete record length. | |
1155 | */ | |
1156 | if (svsk->sk_tcplen < 4) { | |
1157 | unsigned long want = 4 - svsk->sk_tcplen; | |
1158 | struct kvec iov; | |
1159 | ||
1160 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; | |
1161 | iov.iov_len = want; | |
1162 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
1163 | goto error; | |
1164 | svsk->sk_tcplen += len; | |
1165 | ||
1166 | if (len < want) { | |
1167 | dprintk("svc: short recvfrom while reading record length (%d of %lu)\n", | |
cca5172a | 1168 | len, want); |
a6046f71 | 1169 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
1170 | return -EAGAIN; /* record header not complete */ |
1171 | } | |
1172 | ||
1173 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
1174 | if (!(svsk->sk_reclen & 0x80000000)) { | |
1175 | /* FIXME: technically, a record can be fragmented, | |
1176 | * and non-terminal fragments will not have the top | |
1177 | * bit set in the fragment length header. | |
1178 | * But apparently no known nfs clients send fragmented | |
1179 | * records. */ | |
34e9a63b N |
1180 | if (net_ratelimit()) |
1181 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
1182 | " (non-terminal)\n", | |
1183 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
1184 | goto err_delete; |
1185 | } | |
1186 | svsk->sk_reclen &= 0x7fffffff; | |
1187 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); | |
c6b0a9f8 | 1188 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b N |
1189 | if (net_ratelimit()) |
1190 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
1191 | " (large)\n", | |
1192 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
1193 | goto err_delete; |
1194 | } | |
1195 | } | |
1196 | ||
1197 | /* Check whether enough data is available */ | |
1198 | len = svc_recv_available(svsk); | |
1199 | if (len < 0) | |
1200 | goto error; | |
1201 | ||
1202 | if (len < svsk->sk_reclen) { | |
1203 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
1204 | len, svsk->sk_reclen); | |
a6046f71 | 1205 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
1206 | return -EAGAIN; /* record not complete */ |
1207 | } | |
1208 | len = svsk->sk_reclen; | |
02fc6c36 | 1209 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1210 | |
3cc03b16 | 1211 | vec = rqstp->rq_vec; |
1da177e4 LT |
1212 | vec[0] = rqstp->rq_arg.head[0]; |
1213 | vlen = PAGE_SIZE; | |
1214 | pnum = 1; | |
1215 | while (vlen < len) { | |
44524359 | 1216 | vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]); |
1da177e4 LT |
1217 | vec[pnum].iov_len = PAGE_SIZE; |
1218 | pnum++; | |
1219 | vlen += PAGE_SIZE; | |
1220 | } | |
44524359 | 1221 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1222 | |
1223 | /* Now receive data */ | |
1224 | len = svc_recvfrom(rqstp, vec, pnum, len); | |
1225 | if (len < 0) | |
1226 | goto error; | |
1227 | ||
1228 | dprintk("svc: TCP complete record (%d bytes)\n", len); | |
1229 | rqstp->rq_arg.len = len; | |
1230 | rqstp->rq_arg.page_base = 0; | |
1231 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
1232 | rqstp->rq_arg.head[0].iov_len = len; | |
1233 | rqstp->rq_arg.page_len = 0; | |
1234 | } else { | |
1235 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
1236 | } | |
1237 | ||
5148bf4e | 1238 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
1239 | rqstp->rq_prot = IPPROTO_TCP; |
1240 | ||
1241 | /* Reset TCP read info */ | |
1242 | svsk->sk_reclen = 0; | |
1243 | svsk->sk_tcplen = 0; | |
1244 | ||
9dbc240f | 1245 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
a6046f71 | 1246 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
1247 | if (serv->sv_stats) |
1248 | serv->sv_stats->nettcpcnt++; | |
1249 | ||
1250 | return len; | |
1251 | ||
1252 | err_delete: | |
02fc6c36 | 1253 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1254 | return -EAGAIN; |
1255 | ||
1256 | error: | |
1257 | if (len == -EAGAIN) { | |
1258 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
a6046f71 | 1259 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
1260 | } else { |
1261 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
bb5cf160 | 1262 | svsk->sk_xprt.xpt_server->sv_name, -len); |
93fbf1a5 | 1263 | goto err_delete; |
1da177e4 LT |
1264 | } |
1265 | ||
1266 | return len; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * Send out data on TCP socket. | |
1271 | */ | |
1272 | static int | |
1273 | svc_tcp_sendto(struct svc_rqst *rqstp) | |
1274 | { | |
1275 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1276 | int sent; | |
d8ed029d | 1277 | __be32 reclen; |
1da177e4 LT |
1278 | |
1279 | /* Set up the first element of the reply kvec. | |
1280 | * Any other kvecs that may be in use have been taken | |
1281 | * care of by the server implementation itself. | |
1282 | */ | |
1283 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1284 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1285 | ||
57b1d3ba | 1286 | if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags)) |
1da177e4 LT |
1287 | return -ENOTCONN; |
1288 | ||
1289 | sent = svc_sendto(rqstp, &rqstp->rq_res); | |
1290 | if (sent != xbufp->len) { | |
1291 | printk(KERN_NOTICE "rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n", | |
57b1d3ba | 1292 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1293 | (sent<0)?"got error":"sent only", |
1294 | sent, xbufp->len); | |
57b1d3ba | 1295 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1296 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1297 | sent = -EAGAIN; |
1298 | } | |
1299 | return sent; | |
1300 | } | |
1301 | ||
e831fe65 TT |
1302 | /* |
1303 | * Setup response header. TCP has a 4B record length field. | |
1304 | */ | |
1305 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1306 | { | |
1307 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1308 | ||
1309 | /* tcp needs a space for the record length... */ | |
1310 | svc_putnl(resv, 0); | |
1311 | } | |
1312 | ||
323bee32 TT |
1313 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
1314 | { | |
57b1d3ba | 1315 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
bb5cf160 | 1316 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 TT |
1317 | int required; |
1318 | int wspace; | |
1319 | ||
1320 | /* | |
1321 | * Set the SOCK_NOSPACE flag before checking the available | |
1322 | * sock space. | |
1323 | */ | |
1324 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 1325 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
1326 | wspace = sk_stream_wspace(svsk->sk_sk); |
1327 | ||
1328 | if (wspace < sk_stream_min_wspace(svsk->sk_sk)) | |
1329 | return 0; | |
1330 | if (required * 2 > wspace) | |
1331 | return 0; | |
1332 | ||
1333 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
1334 | return 1; | |
1335 | } | |
1336 | ||
b700cbb1 TT |
1337 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
1338 | struct sockaddr *sa, int salen, | |
1339 | int flags) | |
1340 | { | |
1341 | return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags); | |
1342 | } | |
1343 | ||
360d8738 | 1344 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1345 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1346 | .xpo_recvfrom = svc_tcp_recvfrom, |
1347 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1348 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
1349 | .xpo_detach = svc_sock_detach, |
1350 | .xpo_free = svc_sock_free, | |
e831fe65 | 1351 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1352 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1353 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1354 | }; |
1355 | ||
1356 | static struct svc_xprt_class svc_tcp_class = { | |
1357 | .xcl_name = "tcp", | |
b700cbb1 | 1358 | .xcl_owner = THIS_MODULE, |
360d8738 | 1359 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1360 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1361 | }; |
1362 | ||
1363 | void svc_init_xprt_sock(void) | |
1364 | { | |
1365 | svc_reg_xprt_class(&svc_tcp_class); | |
1366 | svc_reg_xprt_class(&svc_udp_class); | |
1367 | } | |
1368 | ||
1369 | void svc_cleanup_xprt_sock(void) | |
1370 | { | |
1371 | svc_unreg_xprt_class(&svc_tcp_class); | |
1372 | svc_unreg_xprt_class(&svc_udp_class); | |
1373 | } | |
1374 | ||
bb5cf160 | 1375 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1376 | { |
1377 | struct sock *sk = svsk->sk_sk; | |
1378 | struct tcp_sock *tp = tcp_sk(sk); | |
1379 | ||
bb5cf160 | 1380 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); |
def13d74 | 1381 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1382 | if (sk->sk_state == TCP_LISTEN) { |
1383 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1384 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1385 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1386 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1387 | } else { |
1388 | dprintk("setting up TCP socket for reading\n"); | |
1389 | sk->sk_state_change = svc_tcp_state_change; | |
1390 | sk->sk_data_ready = svc_tcp_data_ready; | |
1391 | sk->sk_write_space = svc_write_space; | |
1392 | ||
1393 | svsk->sk_reclen = 0; | |
1394 | svsk->sk_tcplen = 0; | |
1395 | ||
1396 | tp->nonagle = 1; /* disable Nagle's algorithm */ | |
1397 | ||
1398 | /* initialise setting must have enough space to | |
cca5172a | 1399 | * receive and respond to one request. |
1da177e4 LT |
1400 | * svc_tcp_recvfrom will re-adjust if necessary |
1401 | */ | |
1402 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
1403 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
1404 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 1405 | |
02fc6c36 TT |
1406 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1407 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
cca5172a | 1408 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1409 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1410 | } |
1411 | } | |
1412 | ||
1413 | void | |
1414 | svc_sock_update_bufs(struct svc_serv *serv) | |
1415 | { | |
1416 | /* | |
1417 | * The number of server threads has changed. Update | |
1418 | * rcvbuf and sndbuf accordingly on all sockets | |
1419 | */ | |
1420 | struct list_head *le; | |
1421 | ||
1422 | spin_lock_bh(&serv->sv_lock); | |
1423 | list_for_each(le, &serv->sv_permsocks) { | |
cca5172a | 1424 | struct svc_sock *svsk = |
7a182083 | 1425 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1426 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1427 | } |
1428 | list_for_each(le, &serv->sv_tempsocks) { | |
1429 | struct svc_sock *svsk = | |
7a182083 | 1430 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1431 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1432 | } |
1433 | spin_unlock_bh(&serv->sv_lock); | |
1434 | } | |
1435 | ||
e1b3157f TT |
1436 | /* |
1437 | * Make sure that we don't have too many active connections. If we | |
1438 | * have, something must be dropped. | |
1439 | * | |
1440 | * There's no point in trying to do random drop here for DoS | |
1441 | * prevention. The NFS clients does 1 reconnect in 15 seconds. An | |
1442 | * attacker can easily beat that. | |
1443 | * | |
1444 | * The only somewhat efficient mechanism would be if drop old | |
1445 | * connections from the same IP first. But right now we don't even | |
1446 | * record the client IP in svc_sock. | |
1447 | */ | |
1448 | static void svc_check_conn_limits(struct svc_serv *serv) | |
1449 | { | |
1450 | if (serv->sv_tmpcnt > (serv->sv_nrthreads+3)*20) { | |
18d19f94 | 1451 | struct svc_xprt *xprt = NULL; |
e1b3157f TT |
1452 | spin_lock_bh(&serv->sv_lock); |
1453 | if (!list_empty(&serv->sv_tempsocks)) { | |
1454 | if (net_ratelimit()) { | |
1455 | /* Try to help the admin */ | |
18d19f94 TT |
1456 | printk(KERN_NOTICE "%s: too many open " |
1457 | "connections, consider increasing the " | |
e1b3157f TT |
1458 | "number of nfsd threads\n", |
1459 | serv->sv_name); | |
1460 | } | |
1461 | /* | |
18d19f94 | 1462 | * Always select the oldest connection. It's not fair, |
e1b3157f TT |
1463 | * but so is life |
1464 | */ | |
18d19f94 TT |
1465 | xprt = list_entry(serv->sv_tempsocks.prev, |
1466 | struct svc_xprt, | |
1467 | xpt_list); | |
1468 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
1469 | svc_xprt_get(xprt); | |
e1b3157f TT |
1470 | } |
1471 | spin_unlock_bh(&serv->sv_lock); | |
1472 | ||
18d19f94 TT |
1473 | if (xprt) { |
1474 | svc_xprt_enqueue(xprt); | |
1475 | svc_xprt_put(xprt); | |
e1b3157f TT |
1476 | } |
1477 | } | |
1478 | } | |
1479 | ||
1da177e4 | 1480 | /* |
3262c816 GB |
1481 | * Receive the next request on any socket. This code is carefully |
1482 | * organised not to touch any cachelines in the shared svc_serv | |
1483 | * structure, only cachelines in the local svc_pool. | |
1da177e4 LT |
1484 | */ |
1485 | int | |
6fb2b47f | 1486 | svc_recv(struct svc_rqst *rqstp, long timeout) |
1da177e4 | 1487 | { |
c36adb2a | 1488 | struct svc_xprt *xprt = NULL; |
6fb2b47f | 1489 | struct svc_serv *serv = rqstp->rq_server; |
3262c816 | 1490 | struct svc_pool *pool = rqstp->rq_pool; |
44524359 | 1491 | int len, i; |
c36adb2a | 1492 | int pages; |
1da177e4 LT |
1493 | struct xdr_buf *arg; |
1494 | DECLARE_WAITQUEUE(wait, current); | |
1495 | ||
1496 | dprintk("svc: server %p waiting for data (to = %ld)\n", | |
1497 | rqstp, timeout); | |
1498 | ||
c36adb2a | 1499 | if (rqstp->rq_xprt) |
cca5172a | 1500 | printk(KERN_ERR |
c36adb2a | 1501 | "svc_recv: service %p, transport not NULL!\n", |
1da177e4 LT |
1502 | rqstp); |
1503 | if (waitqueue_active(&rqstp->rq_wait)) | |
cca5172a | 1504 | printk(KERN_ERR |
1da177e4 LT |
1505 | "svc_recv: service %p, wait queue active!\n", |
1506 | rqstp); | |
1507 | ||
1da177e4 LT |
1508 | |
1509 | /* now allocate needed pages. If we get a failure, sleep briefly */ | |
c6b0a9f8 | 1510 | pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE; |
44524359 N |
1511 | for (i=0; i < pages ; i++) |
1512 | while (rqstp->rq_pages[i] == NULL) { | |
1513 | struct page *p = alloc_page(GFP_KERNEL); | |
1514 | if (!p) | |
1515 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); | |
1516 | rqstp->rq_pages[i] = p; | |
1da177e4 | 1517 | } |
250f3915 N |
1518 | rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ |
1519 | BUG_ON(pages >= RPCSVC_MAXPAGES); | |
1da177e4 LT |
1520 | |
1521 | /* Make arg->head point to first page and arg->pages point to rest */ | |
1522 | arg = &rqstp->rq_arg; | |
44524359 | 1523 | arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); |
1da177e4 | 1524 | arg->head[0].iov_len = PAGE_SIZE; |
44524359 | 1525 | arg->pages = rqstp->rq_pages + 1; |
1da177e4 LT |
1526 | arg->page_base = 0; |
1527 | /* save at least one page for response */ | |
1528 | arg->page_len = (pages-2)*PAGE_SIZE; | |
1529 | arg->len = (pages-1)*PAGE_SIZE; | |
1530 | arg->tail[0].iov_len = 0; | |
3e1d1d28 CL |
1531 | |
1532 | try_to_freeze(); | |
1887b935 | 1533 | cond_resched(); |
1da177e4 LT |
1534 | if (signalled()) |
1535 | return -EINTR; | |
1536 | ||
3262c816 | 1537 | spin_lock_bh(&pool->sp_lock); |
c36adb2a TT |
1538 | xprt = svc_xprt_dequeue(pool); |
1539 | if (xprt) { | |
1540 | rqstp->rq_xprt = xprt; | |
1541 | svc_xprt_get(xprt); | |
c6b0a9f8 | 1542 | rqstp->rq_reserved = serv->sv_max_mesg; |
c36adb2a | 1543 | atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved); |
1da177e4 LT |
1544 | } else { |
1545 | /* No data pending. Go to sleep */ | |
3262c816 | 1546 | svc_thread_enqueue(pool, rqstp); |
1da177e4 LT |
1547 | |
1548 | /* | |
1549 | * We have to be able to interrupt this wait | |
1550 | * to bring down the daemons ... | |
1551 | */ | |
1552 | set_current_state(TASK_INTERRUPTIBLE); | |
1553 | add_wait_queue(&rqstp->rq_wait, &wait); | |
3262c816 | 1554 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 LT |
1555 | |
1556 | schedule_timeout(timeout); | |
1557 | ||
3e1d1d28 | 1558 | try_to_freeze(); |
1da177e4 | 1559 | |
3262c816 | 1560 | spin_lock_bh(&pool->sp_lock); |
1da177e4 LT |
1561 | remove_wait_queue(&rqstp->rq_wait, &wait); |
1562 | ||
c36adb2a TT |
1563 | xprt = rqstp->rq_xprt; |
1564 | if (!xprt) { | |
3262c816 GB |
1565 | svc_thread_dequeue(pool, rqstp); |
1566 | spin_unlock_bh(&pool->sp_lock); | |
1da177e4 LT |
1567 | dprintk("svc: server %p, no data yet\n", rqstp); |
1568 | return signalled()? -EINTR : -EAGAIN; | |
1569 | } | |
1570 | } | |
3262c816 | 1571 | spin_unlock_bh(&pool->sp_lock); |
1da177e4 | 1572 | |
d7979ae4 | 1573 | len = 0; |
c36adb2a | 1574 | if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) { |
02fc6c36 | 1575 | dprintk("svc_recv: found XPT_CLOSE\n"); |
c36adb2a TT |
1576 | svc_delete_xprt(xprt); |
1577 | } else if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) { | |
38a417cc | 1578 | struct svc_xprt *newxpt; |
c36adb2a | 1579 | newxpt = xprt->xpt_ops->xpo_accept(xprt); |
b700cbb1 TT |
1580 | if (newxpt) { |
1581 | /* | |
1582 | * We know this module_get will succeed because the | |
1583 | * listener holds a reference too | |
1584 | */ | |
1585 | __module_get(newxpt->xpt_class->xcl_owner); | |
c36adb2a | 1586 | svc_check_conn_limits(xprt->xpt_server); |
4e5caaa5 TT |
1587 | spin_lock_bh(&serv->sv_lock); |
1588 | set_bit(XPT_TEMP, &newxpt->xpt_flags); | |
1589 | list_add(&newxpt->xpt_list, &serv->sv_tempsocks); | |
1590 | serv->sv_tmpcnt++; | |
1591 | if (serv->sv_temptimer.function == NULL) { | |
1592 | /* setup timer to age temp sockets */ | |
1593 | setup_timer(&serv->sv_temptimer, | |
1594 | svc_age_temp_xprts, | |
1595 | (unsigned long)serv); | |
1596 | mod_timer(&serv->sv_temptimer, | |
1597 | jiffies + svc_conn_age_period * HZ); | |
1598 | } | |
1599 | spin_unlock_bh(&serv->sv_lock); | |
6bc5ab13 | 1600 | svc_xprt_received(newxpt); |
b700cbb1 | 1601 | } |
c36adb2a | 1602 | svc_xprt_received(xprt); |
d7979ae4 | 1603 | } else { |
c36adb2a TT |
1604 | dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n", |
1605 | rqstp, pool->sp_id, xprt, | |
1606 | atomic_read(&xprt->xpt_ref.refcount)); | |
1607 | rqstp->rq_deferred = svc_deferred_dequeue(xprt); | |
8c7b0172 | 1608 | if (rqstp->rq_deferred) { |
c36adb2a | 1609 | svc_xprt_received(xprt); |
8c7b0172 TT |
1610 | len = svc_deferred_recv(rqstp); |
1611 | } else | |
c36adb2a | 1612 | len = xprt->xpt_ops->xpo_recvfrom(rqstp); |
d7979ae4 TT |
1613 | dprintk("svc: got len=%d\n", len); |
1614 | } | |
1da177e4 LT |
1615 | |
1616 | /* No data, incomplete (TCP) read, or accept() */ | |
1617 | if (len == 0 || len == -EAGAIN) { | |
1618 | rqstp->rq_res.len = 0; | |
eab996d4 | 1619 | svc_xprt_release(rqstp); |
1da177e4 LT |
1620 | return -EAGAIN; |
1621 | } | |
c36adb2a | 1622 | clear_bit(XPT_OLD, &xprt->xpt_flags); |
1da177e4 | 1623 | |
bcdb81ae | 1624 | rqstp->rq_secure = svc_port_is_privileged(svc_addr(rqstp)); |
1da177e4 LT |
1625 | rqstp->rq_chandle.defer = svc_defer; |
1626 | ||
1627 | if (serv->sv_stats) | |
1628 | serv->sv_stats->netcnt++; | |
1629 | return len; | |
1630 | } | |
1631 | ||
cca5172a | 1632 | /* |
1da177e4 LT |
1633 | * Drop request |
1634 | */ | |
1635 | void | |
1636 | svc_drop(struct svc_rqst *rqstp) | |
1637 | { | |
57b1d3ba | 1638 | dprintk("svc: xprt %p dropped request\n", rqstp->rq_xprt); |
eab996d4 | 1639 | svc_xprt_release(rqstp); |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | /* | |
1643 | * Return reply to client. | |
1644 | */ | |
1645 | int | |
1646 | svc_send(struct svc_rqst *rqstp) | |
1647 | { | |
a50fea26 | 1648 | struct svc_xprt *xprt; |
1da177e4 LT |
1649 | int len; |
1650 | struct xdr_buf *xb; | |
1651 | ||
a50fea26 TT |
1652 | xprt = rqstp->rq_xprt; |
1653 | if (!xprt) | |
1da177e4 | 1654 | return -EFAULT; |
1da177e4 LT |
1655 | |
1656 | /* release the receive skb before sending the reply */ | |
5148bf4e | 1657 | rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp); |
1da177e4 LT |
1658 | |
1659 | /* calculate over-all length */ | |
1660 | xb = & rqstp->rq_res; | |
1661 | xb->len = xb->head[0].iov_len + | |
1662 | xb->page_len + | |
1663 | xb->tail[0].iov_len; | |
1664 | ||
a50fea26 TT |
1665 | /* Grab mutex to serialize outgoing data. */ |
1666 | mutex_lock(&xprt->xpt_mutex); | |
1667 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
1da177e4 LT |
1668 | len = -ENOTCONN; |
1669 | else | |
a50fea26 TT |
1670 | len = xprt->xpt_ops->xpo_sendto(rqstp); |
1671 | mutex_unlock(&xprt->xpt_mutex); | |
eab996d4 | 1672 | svc_xprt_release(rqstp); |
1da177e4 LT |
1673 | |
1674 | if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN) | |
1675 | return 0; | |
1676 | return len; | |
1677 | } | |
1678 | ||
36bdfc8b GB |
1679 | /* |
1680 | * Timer function to close old temporary sockets, using | |
1681 | * a mark-and-sweep algorithm. | |
1682 | */ | |
9f8bfae6 | 1683 | static void svc_age_temp_xprts(unsigned long closure) |
36bdfc8b GB |
1684 | { |
1685 | struct svc_serv *serv = (struct svc_serv *)closure; | |
9f8bfae6 | 1686 | struct svc_xprt *xprt; |
36bdfc8b GB |
1687 | struct list_head *le, *next; |
1688 | LIST_HEAD(to_be_aged); | |
1689 | ||
9f8bfae6 | 1690 | dprintk("svc_age_temp_xprts\n"); |
36bdfc8b GB |
1691 | |
1692 | if (!spin_trylock_bh(&serv->sv_lock)) { | |
1693 | /* busy, try again 1 sec later */ | |
9f8bfae6 | 1694 | dprintk("svc_age_temp_xprts: busy\n"); |
36bdfc8b GB |
1695 | mod_timer(&serv->sv_temptimer, jiffies + HZ); |
1696 | return; | |
1697 | } | |
1698 | ||
1699 | list_for_each_safe(le, next, &serv->sv_tempsocks) { | |
9f8bfae6 | 1700 | xprt = list_entry(le, struct svc_xprt, xpt_list); |
36bdfc8b | 1701 | |
9f8bfae6 TT |
1702 | /* First time through, just mark it OLD. Second time |
1703 | * through, close it. */ | |
1704 | if (!test_and_set_bit(XPT_OLD, &xprt->xpt_flags)) | |
36bdfc8b | 1705 | continue; |
9f8bfae6 TT |
1706 | if (atomic_read(&xprt->xpt_ref.refcount) > 1 |
1707 | || test_bit(XPT_BUSY, &xprt->xpt_flags)) | |
36bdfc8b | 1708 | continue; |
9f8bfae6 | 1709 | svc_xprt_get(xprt); |
36bdfc8b | 1710 | list_move(le, &to_be_aged); |
9f8bfae6 TT |
1711 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
1712 | set_bit(XPT_DETACHED, &xprt->xpt_flags); | |
36bdfc8b GB |
1713 | } |
1714 | spin_unlock_bh(&serv->sv_lock); | |
1715 | ||
1716 | while (!list_empty(&to_be_aged)) { | |
1717 | le = to_be_aged.next; | |
9f8bfae6 | 1718 | /* fiddling the xpt_list node is safe 'cos we're XPT_DETACHED */ |
36bdfc8b | 1719 | list_del_init(le); |
9f8bfae6 | 1720 | xprt = list_entry(le, struct svc_xprt, xpt_list); |
36bdfc8b | 1721 | |
9f8bfae6 | 1722 | dprintk("queuing xprt %p for closing\n", xprt); |
36bdfc8b GB |
1723 | |
1724 | /* a thread will dequeue and close it soon */ | |
9f8bfae6 TT |
1725 | svc_xprt_enqueue(xprt); |
1726 | svc_xprt_put(xprt); | |
36bdfc8b GB |
1727 | } |
1728 | ||
1729 | mod_timer(&serv->sv_temptimer, jiffies + svc_conn_age_period * HZ); | |
1730 | } | |
1731 | ||
1da177e4 LT |
1732 | /* |
1733 | * Initialize socket for RPC use and create svc_sock struct | |
1734 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1735 | */ | |
6b174337 CL |
1736 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1737 | struct socket *sock, | |
1738 | int *errp, int flags) | |
1da177e4 LT |
1739 | { |
1740 | struct svc_sock *svsk; | |
1741 | struct sock *inet; | |
6b174337 | 1742 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 LT |
1743 | |
1744 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1745 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1746 | *errp = -ENOMEM; |
1747 | return NULL; | |
1748 | } | |
1da177e4 LT |
1749 | |
1750 | inet = sock->sk; | |
1751 | ||
1752 | /* Register socket with portmapper */ | |
1753 | if (*errp >= 0 && pmap_register) | |
1754 | *errp = svc_register(serv, inet->sk_protocol, | |
1755 | ntohs(inet_sk(inet)->sport)); | |
1756 | ||
1757 | if (*errp < 0) { | |
1758 | kfree(svsk); | |
1759 | return NULL; | |
1760 | } | |
1761 | ||
1da177e4 LT |
1762 | inet->sk_user_data = svsk; |
1763 | svsk->sk_sock = sock; | |
1764 | svsk->sk_sk = inet; | |
1765 | svsk->sk_ostate = inet->sk_state_change; | |
1766 | svsk->sk_odata = inet->sk_data_ready; | |
1767 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1768 | |
1769 | /* Initialize the socket */ | |
1770 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1771 | svc_udp_init(svsk, serv); |
1da177e4 | 1772 | else |
bb5cf160 | 1773 | svc_tcp_init(svsk, serv); |
1da177e4 | 1774 | |
1da177e4 LT |
1775 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1776 | svsk, svsk->sk_sk); | |
1777 | ||
1da177e4 LT |
1778 | return svsk; |
1779 | } | |
1780 | ||
b41b66d6 N |
1781 | int svc_addsock(struct svc_serv *serv, |
1782 | int fd, | |
1783 | char *name_return, | |
1784 | int *proto) | |
1785 | { | |
1786 | int err = 0; | |
1787 | struct socket *so = sockfd_lookup(fd, &err); | |
1788 | struct svc_sock *svsk = NULL; | |
1789 | ||
1790 | if (!so) | |
1791 | return err; | |
1792 | if (so->sk->sk_family != AF_INET) | |
1793 | err = -EAFNOSUPPORT; | |
1794 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1795 | so->sk->sk_protocol != IPPROTO_UDP) | |
1796 | err = -EPROTONOSUPPORT; | |
1797 | else if (so->state > SS_UNCONNECTED) | |
1798 | err = -EISCONN; | |
1799 | else { | |
6b174337 | 1800 | svsk = svc_setup_socket(serv, so, &err, SVC_SOCK_DEFAULTS); |
e79eff1f | 1801 | if (svsk) { |
9dbc240f TT |
1802 | struct sockaddr_storage addr; |
1803 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1804 | int salen; | |
1805 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1806 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
4e5caaa5 TT |
1807 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
1808 | spin_lock_bh(&serv->sv_lock); | |
1809 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1810 | spin_unlock_bh(&serv->sv_lock); | |
a6046f71 | 1811 | svc_xprt_received(&svsk->sk_xprt); |
b41b66d6 | 1812 | err = 0; |
e79eff1f | 1813 | } |
b41b66d6 N |
1814 | } |
1815 | if (err) { | |
1816 | sockfd_put(so); | |
1817 | return err; | |
1818 | } | |
1819 | if (proto) *proto = so->sk->sk_protocol; | |
1820 | return one_sock_name(name_return, svsk); | |
1821 | } | |
1822 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1823 | ||
1da177e4 LT |
1824 | /* |
1825 | * Create socket for RPC service. | |
1826 | */ | |
b700cbb1 TT |
1827 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1828 | int protocol, | |
1829 | struct sockaddr *sin, int len, | |
1830 | int flags) | |
1da177e4 LT |
1831 | { |
1832 | struct svc_sock *svsk; | |
1833 | struct socket *sock; | |
1834 | int error; | |
1835 | int type; | |
ad06e4bd | 1836 | char buf[RPC_MAX_ADDRBUFLEN]; |
9dbc240f TT |
1837 | struct sockaddr_storage addr; |
1838 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1839 | int newlen; | |
1da177e4 | 1840 | |
ad06e4bd CL |
1841 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1842 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1843 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1844 | |
1845 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1846 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1847 | "sockets supported\n"); | |
b700cbb1 | 1848 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1849 | } |
1850 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; | |
1851 | ||
77f1f67a CL |
1852 | error = sock_create_kern(sin->sa_family, type, protocol, &sock); |
1853 | if (error < 0) | |
b700cbb1 | 1854 | return ERR_PTR(error); |
1da177e4 | 1855 | |
ed07536e PZ |
1856 | svc_reclassify_socket(sock); |
1857 | ||
18114746 | 1858 | if (type == SOCK_STREAM) |
77f1f67a CL |
1859 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
1860 | error = kernel_bind(sock, sin, len); | |
18114746 ES |
1861 | if (error < 0) |
1862 | goto bummer; | |
1da177e4 | 1863 | |
9dbc240f TT |
1864 | newlen = len; |
1865 | error = kernel_getsockname(sock, newsin, &newlen); | |
1866 | if (error < 0) | |
1867 | goto bummer; | |
1868 | ||
1da177e4 | 1869 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1870 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1871 | goto bummer; |
1872 | } | |
1873 | ||
e79eff1f | 1874 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
9dbc240f | 1875 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
b700cbb1 | 1876 | return (struct svc_xprt *)svsk; |
e79eff1f | 1877 | } |
1da177e4 LT |
1878 | |
1879 | bummer: | |
1880 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1881 | sock_release(sock); | |
b700cbb1 | 1882 | return ERR_PTR(error); |
1da177e4 LT |
1883 | } |
1884 | ||
755cceab TT |
1885 | /* |
1886 | * Detach the svc_sock from the socket so that no | |
1887 | * more callbacks occur. | |
1888 | */ | |
1889 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1890 | { | |
1891 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1892 | struct sock *sk = svsk->sk_sk; | |
1893 | ||
1894 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1895 | ||
1896 | /* put back the old socket callbacks */ | |
1897 | sk->sk_state_change = svsk->sk_ostate; | |
1898 | sk->sk_data_ready = svsk->sk_odata; | |
1899 | sk->sk_write_space = svsk->sk_owspace; | |
1900 | } | |
1901 | ||
1902 | /* | |
1903 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1904 | */ | |
1905 | static void svc_sock_free(struct svc_xprt *xprt) | |
1906 | { | |
1907 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1908 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1909 | ||
755cceab TT |
1910 | if (svsk->sk_sock->file) |
1911 | sockfd_put(svsk->sk_sock); | |
1912 | else | |
1913 | sock_release(svsk->sk_sock); | |
1914 | kfree(svsk); | |
1915 | } | |
1916 | ||
1da177e4 | 1917 | /* |
7a182083 | 1918 | * Remove a dead transport |
1da177e4 | 1919 | */ |
7a182083 | 1920 | static void svc_delete_xprt(struct svc_xprt *xprt) |
1da177e4 | 1921 | { |
7a182083 | 1922 | struct svc_serv *serv = xprt->xpt_server; |
1da177e4 | 1923 | |
7a182083 TT |
1924 | dprintk("svc: svc_delete_xprt(%p)\n", xprt); |
1925 | xprt->xpt_ops->xpo_detach(xprt); | |
1da177e4 LT |
1926 | |
1927 | spin_lock_bh(&serv->sv_lock); | |
7a182083 TT |
1928 | if (!test_and_set_bit(XPT_DETACHED, &xprt->xpt_flags)) |
1929 | list_del_init(&xprt->xpt_list); | |
cca5172a | 1930 | /* |
7a182083 TT |
1931 | * We used to delete the transport from whichever list |
1932 | * it's sk_xprt.xpt_ready node was on, but we don't actually | |
3262c816 GB |
1933 | * need to. This is because the only time we're called |
1934 | * while still attached to a queue, the queue itself | |
1935 | * is about to be destroyed (in svc_destroy). | |
1936 | */ | |
7a182083 TT |
1937 | if (!test_and_set_bit(XPT_DEAD, &xprt->xpt_flags)) { |
1938 | BUG_ON(atomic_read(&xprt->xpt_ref.refcount) < 2); | |
1939 | if (test_bit(XPT_TEMP, &xprt->xpt_flags)) | |
1da177e4 | 1940 | serv->sv_tmpcnt--; |
7a182083 | 1941 | svc_xprt_put(xprt); |
aaf68cfb | 1942 | } |
d6740df9 | 1943 | spin_unlock_bh(&serv->sv_lock); |
aaf68cfb N |
1944 | } |
1945 | ||
7a182083 | 1946 | static void svc_close_xprt(struct svc_xprt *xprt) |
aaf68cfb | 1947 | { |
7a182083 TT |
1948 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
1949 | if (test_and_set_bit(XPT_BUSY, &xprt->xpt_flags)) | |
aaf68cfb N |
1950 | /* someone else will have to effect the close */ |
1951 | return; | |
1952 | ||
7a182083 TT |
1953 | svc_xprt_get(xprt); |
1954 | svc_delete_xprt(xprt); | |
1955 | clear_bit(XPT_BUSY, &xprt->xpt_flags); | |
1956 | svc_xprt_put(xprt); | |
1da177e4 LT |
1957 | } |
1958 | ||
7a182083 | 1959 | void svc_close_all(struct list_head *xprt_list) |
cda1fd4a | 1960 | { |
7a182083 TT |
1961 | struct svc_xprt *xprt; |
1962 | struct svc_xprt *tmp; | |
1963 | ||
1964 | list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) { | |
1965 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
1966 | if (test_bit(XPT_BUSY, &xprt->xpt_flags)) { | |
1967 | /* Waiting to be processed, but no threads left, | |
1968 | * So just remove it from the waiting list | |
1969 | */ | |
1970 | list_del_init(&xprt->xpt_ready); | |
1971 | clear_bit(XPT_BUSY, &xprt->xpt_flags); | |
1972 | } | |
1973 | svc_close_xprt(xprt); | |
cda1fd4a | 1974 | } |
cda1fd4a N |
1975 | } |
1976 | ||
1da177e4 | 1977 | /* |
cca5172a | 1978 | * Handle defer and revisit of requests |
1da177e4 LT |
1979 | */ |
1980 | ||
1981 | static void svc_revisit(struct cache_deferred_req *dreq, int too_many) | |
1982 | { | |
1983 | struct svc_deferred_req *dr = container_of(dreq, struct svc_deferred_req, handle); | |
8c7b0172 | 1984 | struct svc_xprt *xprt = dr->xprt; |
1da177e4 LT |
1985 | |
1986 | if (too_many) { | |
8c7b0172 | 1987 | svc_xprt_put(xprt); |
1da177e4 LT |
1988 | kfree(dr); |
1989 | return; | |
1990 | } | |
1991 | dprintk("revisit queued\n"); | |
8c7b0172 TT |
1992 | dr->xprt = NULL; |
1993 | spin_lock(&xprt->xpt_lock); | |
1994 | list_add(&dr->handle.recent, &xprt->xpt_deferred); | |
1995 | spin_unlock(&xprt->xpt_lock); | |
1996 | set_bit(XPT_DEFERRED, &xprt->xpt_flags); | |
1997 | svc_xprt_enqueue(xprt); | |
1998 | svc_xprt_put(xprt); | |
1da177e4 LT |
1999 | } |
2000 | ||
2001 | static struct cache_deferred_req * | |
2002 | svc_defer(struct cache_req *req) | |
2003 | { | |
2004 | struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle); | |
2005 | int size = sizeof(struct svc_deferred_req) + (rqstp->rq_arg.len); | |
2006 | struct svc_deferred_req *dr; | |
2007 | ||
2008 | if (rqstp->rq_arg.page_len) | |
2009 | return NULL; /* if more than a page, give up FIXME */ | |
2010 | if (rqstp->rq_deferred) { | |
2011 | dr = rqstp->rq_deferred; | |
2012 | rqstp->rq_deferred = NULL; | |
2013 | } else { | |
2014 | int skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
2015 | /* FIXME maybe discard if size too large */ | |
2016 | dr = kmalloc(size, GFP_KERNEL); | |
2017 | if (dr == NULL) | |
2018 | return NULL; | |
2019 | ||
2020 | dr->handle.owner = rqstp->rq_server; | |
2021 | dr->prot = rqstp->rq_prot; | |
24422222 CL |
2022 | memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen); |
2023 | dr->addrlen = rqstp->rq_addrlen; | |
1918e341 | 2024 | dr->daddr = rqstp->rq_daddr; |
1da177e4 LT |
2025 | dr->argslen = rqstp->rq_arg.len >> 2; |
2026 | memcpy(dr->args, rqstp->rq_arg.head[0].iov_base-skip, dr->argslen<<2); | |
2027 | } | |
e1b3157f | 2028 | svc_xprt_get(rqstp->rq_xprt); |
8c7b0172 | 2029 | dr->xprt = rqstp->rq_xprt; |
1da177e4 LT |
2030 | |
2031 | dr->handle.revisit = svc_revisit; | |
2032 | return &dr->handle; | |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * recv data from a deferred request into an active one | |
2037 | */ | |
2038 | static int svc_deferred_recv(struct svc_rqst *rqstp) | |
2039 | { | |
2040 | struct svc_deferred_req *dr = rqstp->rq_deferred; | |
2041 | ||
2042 | rqstp->rq_arg.head[0].iov_base = dr->args; | |
2043 | rqstp->rq_arg.head[0].iov_len = dr->argslen<<2; | |
2044 | rqstp->rq_arg.page_len = 0; | |
2045 | rqstp->rq_arg.len = dr->argslen<<2; | |
2046 | rqstp->rq_prot = dr->prot; | |
24422222 CL |
2047 | memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen); |
2048 | rqstp->rq_addrlen = dr->addrlen; | |
1918e341 | 2049 | rqstp->rq_daddr = dr->daddr; |
44524359 | 2050 | rqstp->rq_respages = rqstp->rq_pages; |
1da177e4 LT |
2051 | return dr->argslen<<2; |
2052 | } | |
2053 | ||
2054 | ||
8c7b0172 | 2055 | static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt) |
1da177e4 LT |
2056 | { |
2057 | struct svc_deferred_req *dr = NULL; | |
cca5172a | 2058 | |
8c7b0172 | 2059 | if (!test_bit(XPT_DEFERRED, &xprt->xpt_flags)) |
1da177e4 | 2060 | return NULL; |
8c7b0172 TT |
2061 | spin_lock(&xprt->xpt_lock); |
2062 | clear_bit(XPT_DEFERRED, &xprt->xpt_flags); | |
2063 | if (!list_empty(&xprt->xpt_deferred)) { | |
2064 | dr = list_entry(xprt->xpt_deferred.next, | |
1da177e4 LT |
2065 | struct svc_deferred_req, |
2066 | handle.recent); | |
2067 | list_del_init(&dr->handle.recent); | |
8c7b0172 | 2068 | set_bit(XPT_DEFERRED, &xprt->xpt_flags); |
1da177e4 | 2069 | } |
8c7b0172 | 2070 | spin_unlock(&xprt->xpt_lock); |
1da177e4 LT |
2071 | return dr; |
2072 | } |