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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 | |
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> |
b7872fe8 | 41 | #include <net/tcp.h> |
c752f073 | 42 | #include <net/tcp_states.h> |
1da177e4 LT |
43 | #include <asm/uaccess.h> |
44 | #include <asm/ioctls.h> | |
45 | ||
46 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 47 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 48 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 49 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
50 | #include <linux/sunrpc/svcsock.h> |
51 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 52 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 53 | |
360d8738 | 54 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
55 | |
56 | ||
57 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 58 | int *errp, int flags); |
1da177e4 LT |
59 | static void svc_udp_data_ready(struct sock *, int); |
60 | static int svc_udp_recvfrom(struct svc_rqst *); | |
61 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 62 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 63 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 64 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 65 | |
b700cbb1 | 66 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
67 | struct net *, struct sockaddr *, |
68 | int, int); | |
1f11a034 AA |
69 | #if defined(CONFIG_NFS_V4_1) |
70 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, | |
71 | struct net *, struct sockaddr *, | |
72 | int, int); | |
73 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
74 | #endif /* CONFIG_NFS_V4_1 */ | |
75 | ||
ed07536e PZ |
76 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
77 | static struct lock_class_key svc_key[2]; | |
78 | static struct lock_class_key svc_slock_key[2]; | |
79 | ||
0f0257ea | 80 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
81 | { |
82 | struct sock *sk = sock->sk; | |
02b3d346 | 83 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
84 | switch (sk->sk_family) { |
85 | case AF_INET: | |
86 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
87 | &svc_slock_key[0], |
88 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
89 | &svc_key[0]); | |
ed07536e PZ |
90 | break; |
91 | ||
92 | case AF_INET6: | |
93 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
94 | &svc_slock_key[1], |
95 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
96 | &svc_key[1]); | |
ed07536e PZ |
97 | break; |
98 | ||
99 | default: | |
100 | BUG(); | |
101 | } | |
102 | } | |
103 | #else | |
0f0257ea | 104 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
105 | { |
106 | } | |
107 | #endif | |
108 | ||
1da177e4 LT |
109 | /* |
110 | * Release an skbuff after use | |
111 | */ | |
5148bf4e | 112 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 113 | { |
5148bf4e | 114 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
115 | |
116 | if (skb) { | |
57b1d3ba TT |
117 | struct svc_sock *svsk = |
118 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 119 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
120 | |
121 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 122 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 123 | } |
1da177e4 LT |
124 | } |
125 | ||
b92503b2 CL |
126 | union svc_pktinfo_u { |
127 | struct in_pktinfo pkti; | |
b92503b2 | 128 | struct in6_pktinfo pkti6; |
b92503b2 | 129 | }; |
bc375ea7 DM |
130 | #define SVC_PKTINFO_SPACE \ |
131 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
132 | |
133 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
134 | { | |
57b1d3ba TT |
135 | struct svc_sock *svsk = |
136 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
137 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
138 | case AF_INET: { |
139 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
140 | ||
141 | cmh->cmsg_level = SOL_IP; | |
142 | cmh->cmsg_type = IP_PKTINFO; | |
143 | pki->ipi_ifindex = 0; | |
144 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
145 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
146 | } | |
147 | break; | |
5a05ed73 | 148 | |
b92503b2 CL |
149 | case AF_INET6: { |
150 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
151 | ||
152 | cmh->cmsg_level = SOL_IPV6; | |
153 | cmh->cmsg_type = IPV6_PKTINFO; | |
154 | pki->ipi6_ifindex = 0; | |
155 | ipv6_addr_copy(&pki->ipi6_addr, | |
156 | &rqstp->rq_daddr.addr6); | |
157 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
158 | } | |
159 | break; | |
b92503b2 | 160 | } |
b92503b2 CL |
161 | } |
162 | ||
1da177e4 | 163 | /* |
4cfc7e60 | 164 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 165 | */ |
4cfc7e60 RI |
166 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
167 | struct page *headpage, unsigned long headoffset, | |
168 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 169 | { |
1da177e4 LT |
170 | int result; |
171 | int size; | |
172 | struct page **ppage = xdr->pages; | |
173 | size_t base = xdr->page_base; | |
174 | unsigned int pglen = xdr->page_len; | |
175 | unsigned int flags = MSG_MORE; | |
4cfc7e60 RI |
176 | int slen; |
177 | int len = 0; | |
1da177e4 LT |
178 | |
179 | slen = xdr->len; | |
180 | ||
1da177e4 LT |
181 | /* send head */ |
182 | if (slen == xdr->head[0].iov_len) | |
183 | flags = 0; | |
4cfc7e60 | 184 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 185 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
186 | if (len != xdr->head[0].iov_len) |
187 | goto out; | |
188 | slen -= xdr->head[0].iov_len; | |
189 | if (slen == 0) | |
190 | goto out; | |
191 | ||
192 | /* send page data */ | |
193 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
194 | while (pglen > 0) { | |
195 | if (slen == size) | |
196 | flags = 0; | |
e6242e92 | 197 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
198 | if (result > 0) |
199 | len += result; | |
200 | if (result != size) | |
201 | goto out; | |
202 | slen -= size; | |
203 | pglen -= size; | |
204 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
205 | base = 0; | |
206 | ppage++; | |
207 | } | |
4cfc7e60 | 208 | |
1da177e4 LT |
209 | /* send tail */ |
210 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
211 | result = kernel_sendpage(sock, tailpage, tailoffset, |
212 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
213 | if (result > 0) |
214 | len += result; | |
215 | } | |
4cfc7e60 RI |
216 | |
217 | out: | |
218 | return len; | |
219 | } | |
220 | ||
221 | ||
222 | /* | |
223 | * Generic sendto routine | |
224 | */ | |
225 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
226 | { | |
227 | struct svc_sock *svsk = | |
228 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
229 | struct socket *sock = svsk->sk_sock; | |
230 | union { | |
231 | struct cmsghdr hdr; | |
232 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
233 | } buffer; | |
234 | struct cmsghdr *cmh = &buffer.hdr; | |
235 | int len = 0; | |
236 | unsigned long tailoff; | |
237 | unsigned long headoff; | |
238 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
239 | ||
240 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
241 | struct msghdr msg = { | |
242 | .msg_name = &rqstp->rq_addr, | |
243 | .msg_namelen = rqstp->rq_addrlen, | |
244 | .msg_control = cmh, | |
245 | .msg_controllen = sizeof(buffer), | |
246 | .msg_flags = MSG_MORE, | |
247 | }; | |
248 | ||
249 | svc_set_cmsg_data(rqstp, cmh); | |
250 | ||
251 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
252 | goto out; | |
253 | } | |
254 | ||
255 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
256 | headoff = 0; | |
257 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
258 | rqstp->rq_respages[0], tailoff); | |
259 | ||
1da177e4 | 260 | out: |
ad06e4bd | 261 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 262 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 263 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
264 | |
265 | return len; | |
266 | } | |
267 | ||
80212d59 N |
268 | /* |
269 | * Report socket names for nfsdfs | |
270 | */ | |
e7942b9f | 271 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 272 | { |
017cb47f CL |
273 | const struct sock *sk = svsk->sk_sk; |
274 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
275 | "udp" : "tcp"; | |
80212d59 N |
276 | int len; |
277 | ||
017cb47f | 278 | switch (sk->sk_family) { |
e7942b9f CL |
279 | case PF_INET: |
280 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 281 | proto_name, |
c720c7e8 ED |
282 | &inet_sk(sk)->inet_rcv_saddr, |
283 | inet_sk(sk)->inet_num); | |
80212d59 | 284 | break; |
58de2f86 CL |
285 | case PF_INET6: |
286 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f CL |
287 | proto_name, |
288 | &inet6_sk(sk)->rcv_saddr, | |
c720c7e8 | 289 | inet_sk(sk)->inet_num); |
80212d59 N |
290 | break; |
291 | default: | |
e7942b9f | 292 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 293 | sk->sk_family); |
80212d59 | 294 | } |
e7942b9f CL |
295 | |
296 | if (len >= remaining) { | |
297 | *buf = '\0'; | |
298 | return -ENAMETOOLONG; | |
80212d59 N |
299 | } |
300 | return len; | |
301 | } | |
302 | ||
8435d34d CL |
303 | /** |
304 | * svc_sock_names - construct a list of listener names in a string | |
305 | * @serv: pointer to RPC service | |
306 | * @buf: pointer to a buffer to fill in with socket names | |
307 | * @buflen: size of the buffer to be filled | |
308 | * @toclose: pointer to '\0'-terminated C string containing the name | |
309 | * of a listener to be closed | |
310 | * | |
311 | * Fills in @buf with a '\n'-separated list of names of listener | |
312 | * sockets. If @toclose is not NULL, the socket named by @toclose | |
313 | * is closed, and is not included in the output list. | |
314 | * | |
315 | * Returns positive length of the socket name string, or a negative | |
316 | * errno value on error. | |
317 | */ | |
318 | int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen, | |
319 | const char *toclose) | |
80212d59 | 320 | { |
b41b66d6 | 321 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
322 | int len = 0; |
323 | ||
324 | if (!serv) | |
325 | return 0; | |
e7942b9f | 326 | |
aaf68cfb | 327 | spin_lock_bh(&serv->sv_lock); |
7a182083 | 328 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
e7942b9f CL |
329 | int onelen = svc_one_sock_name(svsk, buf + len, buflen - len); |
330 | if (onelen < 0) { | |
331 | len = onelen; | |
332 | break; | |
333 | } | |
3942302e | 334 | if (toclose && strcmp(toclose, buf + len) == 0) { |
b41b66d6 | 335 | closesk = svsk; |
3942302e N |
336 | svc_xprt_get(&closesk->sk_xprt); |
337 | } else | |
b41b66d6 | 338 | len += onelen; |
80212d59 | 339 | } |
aaf68cfb | 340 | spin_unlock_bh(&serv->sv_lock); |
e7942b9f | 341 | |
3942302e | 342 | if (closesk) { |
5680c446 N |
343 | /* Should unregister with portmap, but you cannot |
344 | * unregister just one protocol... | |
345 | */ | |
7a182083 | 346 | svc_close_xprt(&closesk->sk_xprt); |
3942302e N |
347 | svc_xprt_put(&closesk->sk_xprt); |
348 | } else if (toclose) | |
37a03472 | 349 | return -ENOENT; |
80212d59 N |
350 | return len; |
351 | } | |
24c3767e | 352 | EXPORT_SYMBOL_GPL(svc_sock_names); |
80212d59 | 353 | |
1da177e4 LT |
354 | /* |
355 | * Check input queue length | |
356 | */ | |
0f0257ea | 357 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 358 | { |
1da177e4 LT |
359 | struct socket *sock = svsk->sk_sock; |
360 | int avail, err; | |
361 | ||
e6242e92 | 362 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
363 | |
364 | return (err >= 0)? avail : err; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Generic recvfrom routine. | |
369 | */ | |
0f0257ea TT |
370 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
371 | int buflen) | |
1da177e4 | 372 | { |
57b1d3ba TT |
373 | struct svc_sock *svsk = |
374 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
375 | struct msghdr msg = { |
376 | .msg_flags = MSG_DONTWAIT, | |
377 | }; | |
378 | int len; | |
1da177e4 | 379 | |
260c1d12 TT |
380 | rqstp->rq_xprt_hlen = 0; |
381 | ||
1ba95105 CL |
382 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
383 | msg.msg_flags); | |
1da177e4 | 384 | |
1da177e4 | 385 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 386 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
387 | return len; |
388 | } | |
389 | ||
31d68ef6 BF |
390 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
391 | struct kvec *iov, int nr, | |
392 | int buflen, unsigned int base) | |
393 | { | |
394 | size_t save_iovlen; | |
395 | void __user *save_iovbase; | |
396 | unsigned int i; | |
397 | int ret; | |
398 | ||
399 | if (base == 0) | |
400 | return svc_recvfrom(rqstp, iov, nr, buflen); | |
401 | ||
402 | for (i = 0; i < nr; i++) { | |
403 | if (iov[i].iov_len > base) | |
404 | break; | |
405 | base -= iov[i].iov_len; | |
406 | } | |
407 | save_iovlen = iov[i].iov_len; | |
408 | save_iovbase = iov[i].iov_base; | |
409 | iov[i].iov_len -= base; | |
410 | iov[i].iov_base += base; | |
411 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); | |
412 | iov[i].iov_len = save_iovlen; | |
413 | iov[i].iov_base = save_iovbase; | |
414 | return ret; | |
415 | } | |
416 | ||
1da177e4 LT |
417 | /* |
418 | * Set socket snd and rcv buffer lengths | |
419 | */ | |
0f0257ea TT |
420 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
421 | unsigned int rcv) | |
1da177e4 LT |
422 | { |
423 | #if 0 | |
424 | mm_segment_t oldfs; | |
425 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
426 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
427 | (char*)&snd, sizeof(snd)); | |
428 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
429 | (char*)&rcv, sizeof(rcv)); | |
430 | #else | |
431 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
432 | * which isn't acceptable. Until that is made conditional | |
433 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
434 | * DaveM said I could! | |
435 | */ | |
436 | lock_sock(sock->sk); | |
437 | sock->sk->sk_sndbuf = snd * 2; | |
438 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 439 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
440 | release_sock(sock->sk); |
441 | #endif | |
442 | } | |
443 | /* | |
444 | * INET callback when data has been received on the socket. | |
445 | */ | |
0f0257ea | 446 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 447 | { |
939bb7ef | 448 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 449 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 | 450 | |
939bb7ef NB |
451 | if (svsk) { |
452 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
453 | svsk, sk, count, |
454 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
455 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 456 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 457 | } |
eaefd110 ED |
458 | if (wq && waitqueue_active(wq)) |
459 | wake_up_interruptible(wq); | |
1da177e4 LT |
460 | } |
461 | ||
462 | /* | |
463 | * INET callback when space is newly available on the socket. | |
464 | */ | |
0f0257ea | 465 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
466 | { |
467 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
eaefd110 | 468 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
469 | |
470 | if (svsk) { | |
471 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 472 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 473 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
474 | } |
475 | ||
eaefd110 | 476 | if (wq && waitqueue_active(wq)) { |
939bb7ef | 477 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 | 478 | svsk); |
eaefd110 | 479 | wake_up_interruptible(wq); |
1da177e4 LT |
480 | } |
481 | } | |
482 | ||
47fcb03f TM |
483 | static void svc_tcp_write_space(struct sock *sk) |
484 | { | |
485 | struct socket *sock = sk->sk_socket; | |
486 | ||
487 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) | |
488 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
489 | svc_write_space(sk); | |
490 | } | |
491 | ||
7702ce40 CL |
492 | /* |
493 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
494 | */ | |
495 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
496 | struct cmsghdr *cmh) | |
497 | { | |
498 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
499 | if (cmh->cmsg_type != IP_PKTINFO) | |
500 | return 0; | |
501 | rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; | |
502 | return 1; | |
503 | } | |
504 | ||
505 | /* | |
506 | * See net/ipv6/datagram.c : datagram_recv_ctl | |
507 | */ | |
508 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
509 | struct cmsghdr *cmh) | |
510 | { | |
511 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
512 | if (cmh->cmsg_type != IPV6_PKTINFO) | |
513 | return 0; | |
514 | ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); | |
515 | return 1; | |
516 | } | |
517 | ||
9dbc240f TT |
518 | /* |
519 | * Copy the UDP datagram's destination address to the rqstp structure. | |
520 | * The 'destination' address in this case is the address to which the | |
521 | * peer sent the datagram, i.e. our local address. For multihomed | |
522 | * hosts, this can change from msg to msg. Note that only the IP | |
523 | * address changes, the port number should remain the same. | |
524 | */ | |
7702ce40 CL |
525 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
526 | struct cmsghdr *cmh) | |
95756482 | 527 | { |
7702ce40 CL |
528 | switch (cmh->cmsg_level) { |
529 | case SOL_IP: | |
530 | return svc_udp_get_dest_address4(rqstp, cmh); | |
531 | case SOL_IPV6: | |
532 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 533 | } |
7702ce40 CL |
534 | |
535 | return 0; | |
95756482 CL |
536 | } |
537 | ||
1da177e4 LT |
538 | /* |
539 | * Receive a datagram from a UDP socket. | |
540 | */ | |
0f0257ea | 541 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 542 | { |
57b1d3ba TT |
543 | struct svc_sock *svsk = |
544 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 545 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 546 | struct sk_buff *skb; |
bc375ea7 DM |
547 | union { |
548 | struct cmsghdr hdr; | |
549 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
550 | } buffer; | |
551 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
552 | struct msghdr msg = { |
553 | .msg_name = svc_addr(rqstp), | |
554 | .msg_control = cmh, | |
555 | .msg_controllen = sizeof(buffer), | |
556 | .msg_flags = MSG_DONTWAIT, | |
557 | }; | |
abc5c44d CL |
558 | size_t len; |
559 | int err; | |
1da177e4 | 560 | |
02fc6c36 | 561 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
562 | /* udp sockets need large rcvbuf as all pending |
563 | * requests are still in that buffer. sndbuf must | |
564 | * also be large enough that there is enough space | |
3262c816 GB |
565 | * for one reply per thread. We count all threads |
566 | * rather than threads in a particular pool, which | |
567 | * provides an upper bound on the number of threads | |
568 | * which will access the socket. | |
1da177e4 LT |
569 | */ |
570 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
571 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
572 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 573 | |
02fc6c36 | 574 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
575 | skb = NULL; |
576 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
577 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
578 | if (err >= 0) | |
579 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
580 | ||
581 | if (skb == NULL) { | |
582 | if (err != -EAGAIN) { | |
583 | /* possibly an icmp error */ | |
584 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 585 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 586 | } |
05ed690e | 587 | return -EAGAIN; |
1da177e4 | 588 | } |
9dbc240f | 589 | len = svc_addr_len(svc_addr(rqstp)); |
abc5c44d CL |
590 | if (len == 0) |
591 | return -EAFNOSUPPORT; | |
9dbc240f | 592 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
593 | if (skb->tstamp.tv64 == 0) { |
594 | skb->tstamp = ktime_get_real(); | |
cca5172a | 595 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
596 | need that much accuracy */ |
597 | } | |
b7aa0bf7 | 598 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 599 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 600 | |
1da177e4 LT |
601 | len = skb->len - sizeof(struct udphdr); |
602 | rqstp->rq_arg.len = len; | |
603 | ||
95756482 | 604 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 605 | |
7702ce40 | 606 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
7a37f578 | 607 | if (net_ratelimit()) |
7702ce40 CL |
608 | printk(KERN_WARNING |
609 | "svc: received unknown control message %d/%d; " | |
610 | "dropping RPC reply datagram\n", | |
611 | cmh->cmsg_level, cmh->cmsg_type); | |
9d410c79 | 612 | skb_free_datagram_locked(svsk->sk_sk, skb); |
7a37f578 N |
613 | return 0; |
614 | } | |
1da177e4 LT |
615 | |
616 | if (skb_is_nonlinear(skb)) { | |
617 | /* we have to copy */ | |
618 | local_bh_disable(); | |
619 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
620 | local_bh_enable(); | |
621 | /* checksum error */ | |
9d410c79 | 622 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
623 | return 0; |
624 | } | |
625 | local_bh_enable(); | |
9d410c79 | 626 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
627 | } else { |
628 | /* we can use it in-place */ | |
0f0257ea TT |
629 | rqstp->rq_arg.head[0].iov_base = skb->data + |
630 | sizeof(struct udphdr); | |
1da177e4 | 631 | rqstp->rq_arg.head[0].iov_len = len; |
fb286bb2 | 632 | if (skb_checksum_complete(skb)) { |
9d410c79 | 633 | skb_free_datagram_locked(svsk->sk_sk, skb); |
fb286bb2 | 634 | return 0; |
1da177e4 | 635 | } |
5148bf4e | 636 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
637 | } |
638 | ||
639 | rqstp->rq_arg.page_base = 0; | |
640 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
641 | rqstp->rq_arg.head[0].iov_len = len; | |
642 | rqstp->rq_arg.page_len = 0; | |
44524359 | 643 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
644 | } else { |
645 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 646 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 647 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
648 | } |
649 | ||
650 | if (serv->sv_stats) | |
651 | serv->sv_stats->netudpcnt++; | |
652 | ||
653 | return len; | |
654 | } | |
655 | ||
656 | static int | |
657 | svc_udp_sendto(struct svc_rqst *rqstp) | |
658 | { | |
659 | int error; | |
660 | ||
661 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
662 | if (error == -ECONNREFUSED) | |
663 | /* ICMP error on earlier request. */ | |
664 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
665 | ||
666 | return error; | |
667 | } | |
668 | ||
e831fe65 TT |
669 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
670 | { | |
671 | } | |
672 | ||
323bee32 TT |
673 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
674 | { | |
675 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 676 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
677 | unsigned long required; |
678 | ||
679 | /* | |
680 | * Set the SOCK_NOSPACE flag before checking the available | |
681 | * sock space. | |
682 | */ | |
683 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 684 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
685 | if (required*2 > sock_wspace(svsk->sk_sk)) |
686 | return 0; | |
687 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
688 | return 1; | |
689 | } | |
690 | ||
38a417cc TT |
691 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
692 | { | |
693 | BUG(); | |
694 | return NULL; | |
695 | } | |
696 | ||
b700cbb1 | 697 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 698 | struct net *net, |
b700cbb1 TT |
699 | struct sockaddr *sa, int salen, |
700 | int flags) | |
701 | { | |
62832c03 | 702 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
703 | } |
704 | ||
360d8738 | 705 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 706 | .xpo_create = svc_udp_create, |
5d137990 TT |
707 | .xpo_recvfrom = svc_udp_recvfrom, |
708 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 709 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
710 | .xpo_detach = svc_sock_detach, |
711 | .xpo_free = svc_sock_free, | |
e831fe65 | 712 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 713 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 714 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
715 | }; |
716 | ||
717 | static struct svc_xprt_class svc_udp_class = { | |
718 | .xcl_name = "udp", | |
b700cbb1 | 719 | .xcl_owner = THIS_MODULE, |
360d8738 | 720 | .xcl_ops = &svc_udp_ops, |
49023155 | 721 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
722 | }; |
723 | ||
bb5cf160 | 724 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 725 | { |
7702ce40 | 726 | int err, level, optname, one = 1; |
7a37f578 | 727 | |
bb5cf160 | 728 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); |
def13d74 | 729 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
730 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
731 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
732 | |
733 | /* initialise setting must have enough space to | |
cca5172a | 734 | * receive and respond to one request. |
1da177e4 LT |
735 | * svc_udp_recvfrom will re-adjust if necessary |
736 | */ | |
737 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
738 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
739 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 740 | |
0f0257ea TT |
741 | /* data might have come in before data_ready set up */ |
742 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 743 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 744 | |
7a37f578 | 745 | /* make sure we get destination address info */ |
7702ce40 CL |
746 | switch (svsk->sk_sk->sk_family) { |
747 | case AF_INET: | |
748 | level = SOL_IP; | |
749 | optname = IP_PKTINFO; | |
750 | break; | |
751 | case AF_INET6: | |
752 | level = SOL_IPV6; | |
753 | optname = IPV6_RECVPKTINFO; | |
754 | break; | |
755 | default: | |
756 | BUG(); | |
757 | } | |
758 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
759 | (char *)&one, sizeof(one)); | |
760 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
761 | } |
762 | ||
763 | /* | |
764 | * A data_ready event on a listening socket means there's a connection | |
765 | * pending. Do not use state_change as a substitute for it. | |
766 | */ | |
0f0257ea | 767 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 768 | { |
939bb7ef | 769 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 770 | wait_queue_head_t *wq; |
1da177e4 LT |
771 | |
772 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 773 | sk, sk->sk_state); |
1da177e4 | 774 | |
939bb7ef NB |
775 | /* |
776 | * This callback may called twice when a new connection | |
777 | * is established as a child socket inherits everything | |
778 | * from a parent LISTEN socket. | |
779 | * 1) data_ready method of the parent socket will be called | |
780 | * when one of child sockets become ESTABLISHED. | |
781 | * 2) data_ready method of the child socket may be called | |
782 | * when it receives data before the socket is accepted. | |
783 | * In case of 2, we should ignore it silently. | |
784 | */ | |
785 | if (sk->sk_state == TCP_LISTEN) { | |
786 | if (svsk) { | |
02fc6c36 | 787 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 788 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
789 | } else |
790 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 791 | } |
939bb7ef | 792 | |
eaefd110 ED |
793 | wq = sk_sleep(sk); |
794 | if (wq && waitqueue_active(wq)) | |
795 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
796 | } |
797 | ||
798 | /* | |
799 | * A state change on a connected socket means it's dying or dead. | |
800 | */ | |
0f0257ea | 801 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 802 | { |
939bb7ef | 803 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 804 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
805 | |
806 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 807 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 808 | |
939bb7ef | 809 | if (!svsk) |
1da177e4 | 810 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 811 | else { |
02fc6c36 | 812 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 813 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 814 | } |
eaefd110 ED |
815 | if (wq && waitqueue_active(wq)) |
816 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
817 | } |
818 | ||
0f0257ea | 819 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 820 | { |
939bb7ef | 821 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 822 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
823 | |
824 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
825 | sk, sk->sk_user_data); |
826 | if (svsk) { | |
02fc6c36 | 827 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 828 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 829 | } |
eaefd110 ED |
830 | if (wq && waitqueue_active(wq)) |
831 | wake_up_interruptible(wq); | |
1da177e4 LT |
832 | } |
833 | ||
834 | /* | |
835 | * Accept a TCP connection | |
836 | */ | |
38a417cc | 837 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 838 | { |
38a417cc | 839 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f AM |
840 | struct sockaddr_storage addr; |
841 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 842 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
843 | struct socket *sock = svsk->sk_sock; |
844 | struct socket *newsock; | |
1da177e4 LT |
845 | struct svc_sock *newsvsk; |
846 | int err, slen; | |
5216a8e7 | 847 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
848 | |
849 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
850 | if (!sock) | |
38a417cc | 851 | return NULL; |
1da177e4 | 852 | |
02fc6c36 | 853 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
854 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
855 | if (err < 0) { | |
1da177e4 LT |
856 | if (err == -ENOMEM) |
857 | printk(KERN_WARNING "%s: no more sockets!\n", | |
858 | serv->sv_name); | |
e6242e92 | 859 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
860 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
861 | serv->sv_name, -err); | |
38a417cc | 862 | return NULL; |
1da177e4 | 863 | } |
02fc6c36 | 864 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 865 | |
cdd88b9f | 866 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
867 | if (err < 0) { |
868 | if (net_ratelimit()) | |
869 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
870 | serv->sv_name, -err); | |
871 | goto failed; /* aborted connection or whatever */ | |
872 | } | |
873 | ||
874 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
875 | * hosts here, but when we get encryption, the IP of the host won't |
876 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 877 | */ |
cdd88b9f | 878 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 879 | dprintk(KERN_WARNING |
ad06e4bd | 880 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 881 | serv->sv_name, |
cdd88b9f | 882 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 883 | } |
ad06e4bd | 884 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 885 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
886 | |
887 | /* make sure that a write doesn't block forever when | |
888 | * low on memory | |
889 | */ | |
890 | newsock->sk->sk_sndtimeo = HZ*30; | |
891 | ||
6b174337 CL |
892 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
893 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 894 | goto failed; |
9dbc240f | 895 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
896 | err = kernel_getsockname(newsock, sin, &slen); |
897 | if (unlikely(err < 0)) { | |
898 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
899 | slen = offsetof(struct sockaddr, sa_data); | |
900 | } | |
9dbc240f | 901 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 902 | |
f9f3cc4f TT |
903 | if (serv->sv_stats) |
904 | serv->sv_stats->nettcpconn++; | |
905 | ||
906 | return &newsvsk->sk_xprt; | |
907 | ||
908 | failed: | |
909 | sock_release(newsock); | |
910 | return NULL; | |
911 | } | |
912 | ||
31d68ef6 BF |
913 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
914 | { | |
915 | unsigned int i, len, npages; | |
916 | ||
917 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
918 | return 0; | |
919 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
920 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
921 | for (i = 0; i < npages; i++) { | |
922 | if (rqstp->rq_pages[i] != NULL) | |
923 | put_page(rqstp->rq_pages[i]); | |
924 | BUG_ON(svsk->sk_pages[i] == NULL); | |
925 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
926 | svsk->sk_pages[i] = NULL; | |
927 | } | |
928 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
929 | return len; | |
930 | } | |
931 | ||
932 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
933 | { | |
934 | unsigned int i, len, npages; | |
935 | ||
936 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
937 | return; | |
938 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
939 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
940 | for (i = 0; i < npages; i++) { | |
941 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
942 | rqstp->rq_pages[i] = NULL; | |
943 | } | |
944 | } | |
945 | ||
946 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
947 | { | |
948 | unsigned int i, len, npages; | |
949 | ||
950 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
951 | goto out; | |
952 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
953 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
954 | for (i = 0; i < npages; i++) { | |
955 | BUG_ON(svsk->sk_pages[i] == NULL); | |
956 | put_page(svsk->sk_pages[i]); | |
957 | svsk->sk_pages[i] = NULL; | |
958 | } | |
959 | out: | |
960 | svsk->sk_tcplen = 0; | |
961 | } | |
962 | ||
1da177e4 | 963 | /* |
8f55f3c0 AB |
964 | * Receive data. |
965 | * If we haven't gotten the record length yet, get the next four bytes. | |
966 | * Otherwise try to gobble up as much as possible up to the complete | |
967 | * record length. | |
1da177e4 | 968 | */ |
8f55f3c0 | 969 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 970 | { |
bb5cf160 | 971 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 972 | unsigned int want; |
8f55f3c0 | 973 | int len; |
1da177e4 | 974 | |
02fc6c36 | 975 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 976 | |
c0401ea0 | 977 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
978 | struct kvec iov; |
979 | ||
5ee78d48 | 980 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
981 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
982 | iov.iov_len = want; | |
983 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
984 | goto error; | |
985 | svsk->sk_tcplen += len; | |
986 | ||
987 | if (len < want) { | |
c0401ea0 CL |
988 | dprintk("svc: short recvfrom while reading record " |
989 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 990 | return -EAGAIN; |
1da177e4 LT |
991 | } |
992 | ||
993 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
c0401ea0 | 994 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { |
1da177e4 LT |
995 | /* FIXME: technically, a record can be fragmented, |
996 | * and non-terminal fragments will not have the top | |
997 | * bit set in the fragment length header. | |
998 | * But apparently no known nfs clients send fragmented | |
999 | * records. */ | |
34e9a63b | 1000 | if (net_ratelimit()) |
c0401ea0 CL |
1001 | printk(KERN_NOTICE "RPC: multiple fragments " |
1002 | "per record not supported\n"); | |
1da177e4 LT |
1003 | goto err_delete; |
1004 | } | |
8f55f3c0 | 1005 | |
c0401ea0 | 1006 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; |
1da177e4 | 1007 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); |
c6b0a9f8 | 1008 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b | 1009 | if (net_ratelimit()) |
c0401ea0 CL |
1010 | printk(KERN_NOTICE "RPC: " |
1011 | "fragment too large: 0x%08lx\n", | |
1012 | (unsigned long)svsk->sk_reclen); | |
1da177e4 LT |
1013 | goto err_delete; |
1014 | } | |
1015 | } | |
1016 | ||
cc6c2127 BF |
1017 | if (svsk->sk_reclen < 8) |
1018 | goto err_delete; /* client is nuts. */ | |
1019 | ||
1da177e4 | 1020 | len = svsk->sk_reclen; |
1da177e4 | 1021 | |
8f55f3c0 | 1022 | return len; |
31d68ef6 BF |
1023 | error: |
1024 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 1025 | return len; |
31d68ef6 | 1026 | err_delete: |
8f55f3c0 | 1027 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
1028 | return -EAGAIN; |
1029 | } | |
1030 | ||
586c52cc | 1031 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 1032 | { |
586c52cc | 1033 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 1034 | struct rpc_rqst *req = NULL; |
586c52cc TM |
1035 | struct kvec *src, *dst; |
1036 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
1037 | __be32 xid; |
1038 | __be32 calldir; | |
4cfc7e60 | 1039 | |
4cfc7e60 RI |
1040 | xid = *p++; |
1041 | calldir = *p; | |
1042 | ||
586c52cc TM |
1043 | if (bc_xprt) |
1044 | req = xprt_lookup_rqst(bc_xprt, xid); | |
4cfc7e60 | 1045 | |
586c52cc TM |
1046 | if (!req) { |
1047 | printk(KERN_NOTICE | |
1048 | "%s: Got unrecognized reply: " | |
1049 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1050 | __func__, ntohl(calldir), | |
1051 | bc_xprt, xid); | |
1052 | return -EAGAIN; | |
4cfc7e60 | 1053 | } |
586c52cc TM |
1054 | |
1055 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1056 | /* | |
1057 | * XXX!: cheating for now! Only copying HEAD. | |
1058 | * But we know this is good enough for now (in fact, for any | |
1059 | * callback reply in the forseeable future). | |
1060 | */ | |
1061 | dst = &req->rq_private_buf.head[0]; | |
1062 | src = &rqstp->rq_arg.head[0]; | |
1063 | if (dst->iov_len < src->iov_len) | |
1064 | return -EAGAIN; /* whatever; just giving up. */ | |
1065 | memcpy(dst->iov_base, src->iov_base, src->iov_len); | |
1066 | xprt_complete_rqst(req->rq_task, svsk->sk_reclen); | |
1067 | rqstp->rq_arg.len = 0; | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1072 | { | |
1073 | int i = 0; | |
1074 | int t = 0; | |
1075 | ||
1076 | while (t < len) { | |
1077 | vec[i].iov_base = page_address(pages[i]); | |
1078 | vec[i].iov_len = PAGE_SIZE; | |
1079 | i++; | |
1080 | t += PAGE_SIZE; | |
1081 | } | |
1082 | return i; | |
4cfc7e60 RI |
1083 | } |
1084 | ||
31d68ef6 | 1085 | |
8f55f3c0 AB |
1086 | /* |
1087 | * Receive data from a TCP socket. | |
1088 | */ | |
1089 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1090 | { | |
1091 | struct svc_sock *svsk = | |
1092 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1093 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1094 | int len; | |
1095 | struct kvec *vec; | |
31d68ef6 | 1096 | unsigned int want, base; |
586c52cc TM |
1097 | __be32 *p; |
1098 | __be32 calldir; | |
5ee78d48 | 1099 | int pnum; |
8f55f3c0 AB |
1100 | |
1101 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1102 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1103 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1104 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1105 | ||
1106 | len = svc_tcp_recv_record(svsk, rqstp); | |
1107 | if (len < 0) | |
1108 | goto error; | |
1109 | ||
31d68ef6 BF |
1110 | base = svc_tcp_restore_pages(svsk, rqstp); |
1111 | want = svsk->sk_reclen - base; | |
1112 | ||
3cc03b16 | 1113 | vec = rqstp->rq_vec; |
4cfc7e60 | 1114 | |
586c52cc TM |
1115 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
1116 | svsk->sk_reclen); | |
1117 | ||
44524359 | 1118 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1119 | |
1120 | /* Now receive data */ | |
31d68ef6 BF |
1121 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
1122 | if (len >= 0) | |
1123 | svsk->sk_tcplen += len; | |
1124 | if (len != want) { | |
1125 | if (len < 0 && len != -EAGAIN) | |
1126 | goto err_other; | |
1127 | svc_tcp_save_pages(svsk, rqstp); | |
1128 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
1129 | svsk->sk_tcplen, svsk->sk_reclen); | |
1130 | goto err_noclose; | |
1131 | } | |
1da177e4 | 1132 | |
5ee78d48 | 1133 | rqstp->rq_arg.len = svsk->sk_reclen; |
1da177e4 | 1134 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1135 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1136 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1137 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1138 | } else |
1139 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1140 | |
5148bf4e | 1141 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
1142 | rqstp->rq_prot = IPPROTO_TCP; |
1143 | ||
586c52cc TM |
1144 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1145 | calldir = p[1]; | |
8985ef0b | 1146 | if (calldir) |
586c52cc | 1147 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1148 | |
1da177e4 LT |
1149 | /* Reset TCP read info */ |
1150 | svsk->sk_reclen = 0; | |
1151 | svsk->sk_tcplen = 0; | |
0601f793 TM |
1152 | /* If we have more data, signal svc_xprt_enqueue() to try again */ |
1153 | if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) | |
1154 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1155 | ||
8985ef0b BF |
1156 | if (len < 0) |
1157 | goto error; | |
1da177e4 | 1158 | |
9dbc240f | 1159 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1160 | if (serv->sv_stats) |
1161 | serv->sv_stats->nettcpcnt++; | |
1162 | ||
31d68ef6 | 1163 | dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); |
5ee78d48 | 1164 | return rqstp->rq_arg.len; |
1da177e4 | 1165 | |
8f55f3c0 | 1166 | error: |
31d68ef6 BF |
1167 | if (len != -EAGAIN) |
1168 | goto err_other; | |
1169 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
8f55f3c0 | 1170 | return -EAGAIN; |
31d68ef6 BF |
1171 | err_other: |
1172 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
1173 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1174 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1175 | err_noclose: | |
1176 | return -EAGAIN; /* record not complete */ | |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | /* | |
1180 | * Send out data on TCP socket. | |
1181 | */ | |
0f0257ea | 1182 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1183 | { |
1184 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1185 | int sent; | |
d8ed029d | 1186 | __be32 reclen; |
1da177e4 LT |
1187 | |
1188 | /* Set up the first element of the reply kvec. | |
1189 | * Any other kvecs that may be in use have been taken | |
1190 | * care of by the server implementation itself. | |
1191 | */ | |
1192 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1193 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1194 | ||
1da177e4 LT |
1195 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1196 | if (sent != xbufp->len) { | |
0f0257ea TT |
1197 | printk(KERN_NOTICE |
1198 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1199 | "- shutting down socket\n", | |
57b1d3ba | 1200 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1201 | (sent<0)?"got error":"sent only", |
1202 | sent, xbufp->len); | |
57b1d3ba | 1203 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1204 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1205 | sent = -EAGAIN; |
1206 | } | |
1207 | return sent; | |
1208 | } | |
1209 | ||
e831fe65 TT |
1210 | /* |
1211 | * Setup response header. TCP has a 4B record length field. | |
1212 | */ | |
1213 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1214 | { | |
1215 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1216 | ||
1217 | /* tcp needs a space for the record length... */ | |
1218 | svc_putnl(resv, 0); | |
1219 | } | |
1220 | ||
323bee32 TT |
1221 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
1222 | { | |
57b1d3ba | 1223 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
47fcb03f | 1224 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 | 1225 | int required; |
323bee32 | 1226 | |
47fcb03f TM |
1227 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
1228 | return 1; | |
1229 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
1230 | if (sk_stream_wspace(svsk->sk_sk) >= required) | |
1231 | return 1; | |
323bee32 | 1232 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
47fcb03f | 1233 | return 0; |
323bee32 TT |
1234 | } |
1235 | ||
b700cbb1 | 1236 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1237 | struct net *net, |
b700cbb1 TT |
1238 | struct sockaddr *sa, int salen, |
1239 | int flags) | |
1240 | { | |
62832c03 | 1241 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1242 | } |
1243 | ||
1f11a034 AA |
1244 | #if defined(CONFIG_NFS_V4_1) |
1245 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, | |
1246 | struct net *, struct sockaddr *, | |
1247 | int, int); | |
1248 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1249 | ||
1250 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1251 | struct net *net, | |
1252 | struct sockaddr *sa, int salen, | |
1253 | int flags) | |
1254 | { | |
1255 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1256 | } | |
1257 | ||
1258 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1259 | { | |
1260 | } | |
1261 | ||
1262 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1263 | .xpo_create = svc_bc_tcp_create, | |
1264 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1265 | .xpo_free = svc_bc_sock_free, | |
1266 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
1267 | }; | |
1268 | ||
1269 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1270 | .xcl_name = "tcp-bc", | |
1271 | .xcl_owner = THIS_MODULE, | |
1272 | .xcl_ops = &svc_tcp_bc_ops, | |
1273 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1274 | }; | |
16b2d1e1 AA |
1275 | |
1276 | static void svc_init_bc_xprt_sock(void) | |
1277 | { | |
1278 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1279 | } | |
1280 | ||
1281 | static void svc_cleanup_bc_xprt_sock(void) | |
1282 | { | |
1283 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1284 | } | |
1285 | #else /* CONFIG_NFS_V4_1 */ | |
1286 | static void svc_init_bc_xprt_sock(void) | |
1287 | { | |
1288 | } | |
1289 | ||
1290 | static void svc_cleanup_bc_xprt_sock(void) | |
1291 | { | |
1292 | } | |
1f11a034 AA |
1293 | #endif /* CONFIG_NFS_V4_1 */ |
1294 | ||
360d8738 | 1295 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1296 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1297 | .xpo_recvfrom = svc_tcp_recvfrom, |
1298 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1299 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1300 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1301 | .xpo_free = svc_sock_free, |
e831fe65 | 1302 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1303 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1304 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1305 | }; |
1306 | ||
1307 | static struct svc_xprt_class svc_tcp_class = { | |
1308 | .xcl_name = "tcp", | |
b700cbb1 | 1309 | .xcl_owner = THIS_MODULE, |
360d8738 | 1310 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1311 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1312 | }; |
1313 | ||
1314 | void svc_init_xprt_sock(void) | |
1315 | { | |
1316 | svc_reg_xprt_class(&svc_tcp_class); | |
1317 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1318 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1319 | } |
1320 | ||
1321 | void svc_cleanup_xprt_sock(void) | |
1322 | { | |
1323 | svc_unreg_xprt_class(&svc_tcp_class); | |
1324 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1325 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1326 | } |
1327 | ||
bb5cf160 | 1328 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1329 | { |
1330 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1331 | |
bb5cf160 | 1332 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); |
def13d74 | 1333 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1334 | if (sk->sk_state == TCP_LISTEN) { |
1335 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1336 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1337 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1338 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1339 | } else { |
1340 | dprintk("setting up TCP socket for reading\n"); | |
1341 | sk->sk_state_change = svc_tcp_state_change; | |
1342 | sk->sk_data_ready = svc_tcp_data_ready; | |
47fcb03f | 1343 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1344 | |
1345 | svsk->sk_reclen = 0; | |
1346 | svsk->sk_tcplen = 0; | |
31d68ef6 | 1347 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1348 | |
b7872fe8 | 1349 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1350 | |
02fc6c36 | 1351 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1352 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1353 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1354 | } |
1355 | } | |
1356 | ||
0f0257ea | 1357 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1358 | { |
1359 | /* | |
1360 | * The number of server threads has changed. Update | |
1361 | * rcvbuf and sndbuf accordingly on all sockets | |
1362 | */ | |
8f3a6de3 | 1363 | struct svc_sock *svsk; |
1da177e4 LT |
1364 | |
1365 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1366 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1367 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
8f3a6de3 | 1368 | list_for_each_entry(svsk, &serv->sv_tempsocks, sk_xprt.xpt_list) |
02fc6c36 | 1369 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1370 | spin_unlock_bh(&serv->sv_lock); |
1371 | } | |
24c3767e | 1372 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1373 | |
1da177e4 LT |
1374 | /* |
1375 | * Initialize socket for RPC use and create svc_sock struct | |
1376 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1377 | */ | |
6b174337 CL |
1378 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1379 | struct socket *sock, | |
1380 | int *errp, int flags) | |
1da177e4 LT |
1381 | { |
1382 | struct svc_sock *svsk; | |
1383 | struct sock *inet; | |
6b174337 | 1384 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 LT |
1385 | |
1386 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1387 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1388 | *errp = -ENOMEM; |
1389 | return NULL; | |
1390 | } | |
1da177e4 LT |
1391 | |
1392 | inet = sock->sk; | |
1393 | ||
1394 | /* Register socket with portmapper */ | |
1395 | if (*errp >= 0 && pmap_register) | |
baf01caf | 1396 | *errp = svc_register(serv, inet->sk_family, inet->sk_protocol, |
c720c7e8 | 1397 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 LT |
1398 | |
1399 | if (*errp < 0) { | |
1400 | kfree(svsk); | |
1401 | return NULL; | |
1402 | } | |
1403 | ||
1da177e4 LT |
1404 | inet->sk_user_data = svsk; |
1405 | svsk->sk_sock = sock; | |
1406 | svsk->sk_sk = inet; | |
1407 | svsk->sk_ostate = inet->sk_state_change; | |
1408 | svsk->sk_odata = inet->sk_data_ready; | |
1409 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1410 | |
1411 | /* Initialize the socket */ | |
1412 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1413 | svc_udp_init(svsk, serv); |
96604398 OK |
1414 | else { |
1415 | /* initialise setting must have enough space to | |
1416 | * receive and respond to one request. | |
1417 | */ | |
1418 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1419 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1420 | svc_tcp_init(svsk, serv); |
96604398 | 1421 | } |
1da177e4 | 1422 | |
1da177e4 LT |
1423 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1424 | svsk, svsk->sk_sk); | |
1425 | ||
1da177e4 LT |
1426 | return svsk; |
1427 | } | |
1428 | ||
bfba9ab4 CL |
1429 | /** |
1430 | * svc_addsock - add a listener socket to an RPC service | |
1431 | * @serv: pointer to RPC service to which to add a new listener | |
1432 | * @fd: file descriptor of the new listener | |
1433 | * @name_return: pointer to buffer to fill in with name of listener | |
1434 | * @len: size of the buffer | |
1435 | * | |
1436 | * Fills in socket name and returns positive length of name if successful. | |
1437 | * Name is terminated with '\n'. On error, returns a negative errno | |
1438 | * value. | |
1439 | */ | |
1440 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1441 | const size_t len) | |
b41b66d6 N |
1442 | { |
1443 | int err = 0; | |
1444 | struct socket *so = sockfd_lookup(fd, &err); | |
1445 | struct svc_sock *svsk = NULL; | |
1446 | ||
1447 | if (!so) | |
1448 | return err; | |
205ba423 | 1449 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
b41b66d6 N |
1450 | err = -EAFNOSUPPORT; |
1451 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1452 | so->sk->sk_protocol != IPPROTO_UDP) | |
1453 | err = -EPROTONOSUPPORT; | |
1454 | else if (so->state > SS_UNCONNECTED) | |
1455 | err = -EISCONN; | |
1456 | else { | |
2da2c21d TT |
1457 | if (!try_module_get(THIS_MODULE)) |
1458 | err = -ENOENT; | |
1459 | else | |
1460 | svsk = svc_setup_socket(serv, so, &err, | |
1461 | SVC_SOCK_DEFAULTS); | |
e79eff1f | 1462 | if (svsk) { |
9dbc240f TT |
1463 | struct sockaddr_storage addr; |
1464 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1465 | int salen; | |
1466 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1467 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
4e5caaa5 TT |
1468 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
1469 | spin_lock_bh(&serv->sv_lock); | |
1470 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1471 | spin_unlock_bh(&serv->sv_lock); | |
a6046f71 | 1472 | svc_xprt_received(&svsk->sk_xprt); |
b41b66d6 | 1473 | err = 0; |
2da2c21d TT |
1474 | } else |
1475 | module_put(THIS_MODULE); | |
b41b66d6 N |
1476 | } |
1477 | if (err) { | |
1478 | sockfd_put(so); | |
1479 | return err; | |
1480 | } | |
e7942b9f | 1481 | return svc_one_sock_name(svsk, name_return, len); |
b41b66d6 N |
1482 | } |
1483 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1484 | ||
1da177e4 LT |
1485 | /* |
1486 | * Create socket for RPC service. | |
1487 | */ | |
b700cbb1 TT |
1488 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1489 | int protocol, | |
62832c03 | 1490 | struct net *net, |
b700cbb1 TT |
1491 | struct sockaddr *sin, int len, |
1492 | int flags) | |
1da177e4 LT |
1493 | { |
1494 | struct svc_sock *svsk; | |
1495 | struct socket *sock; | |
1496 | int error; | |
1497 | int type; | |
9dbc240f TT |
1498 | struct sockaddr_storage addr; |
1499 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1500 | int newlen; | |
c69da774 TM |
1501 | int family; |
1502 | int val; | |
5216a8e7 | 1503 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1504 | |
ad06e4bd CL |
1505 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1506 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1507 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1508 | |
1509 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1510 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1511 | "sockets supported\n"); | |
b700cbb1 | 1512 | return ERR_PTR(-EINVAL); |
1da177e4 | 1513 | } |
c69da774 | 1514 | |
1da177e4 | 1515 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1516 | switch (sin->sa_family) { |
1517 | case AF_INET6: | |
1518 | family = PF_INET6; | |
1519 | break; | |
1520 | case AF_INET: | |
1521 | family = PF_INET; | |
1522 | break; | |
1523 | default: | |
1524 | return ERR_PTR(-EINVAL); | |
1525 | } | |
1da177e4 | 1526 | |
14ec63c3 | 1527 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1528 | if (error < 0) |
b700cbb1 | 1529 | return ERR_PTR(error); |
1da177e4 | 1530 | |
ed07536e PZ |
1531 | svc_reclassify_socket(sock); |
1532 | ||
c69da774 TM |
1533 | /* |
1534 | * If this is an PF_INET6 listener, we want to avoid | |
1535 | * getting requests from IPv4 remotes. Those should | |
1536 | * be shunted to a PF_INET listener via rpcbind. | |
1537 | */ | |
1538 | val = 1; | |
1539 | if (family == PF_INET6) | |
1540 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1541 | (char *)&val, sizeof(val)); | |
1542 | ||
18114746 | 1543 | if (type == SOCK_STREAM) |
77f1f67a CL |
1544 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
1545 | error = kernel_bind(sock, sin, len); | |
18114746 ES |
1546 | if (error < 0) |
1547 | goto bummer; | |
1da177e4 | 1548 | |
9dbc240f TT |
1549 | newlen = len; |
1550 | error = kernel_getsockname(sock, newsin, &newlen); | |
1551 | if (error < 0) | |
1552 | goto bummer; | |
1553 | ||
1da177e4 | 1554 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1555 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1556 | goto bummer; |
1557 | } | |
1558 | ||
e79eff1f | 1559 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
9dbc240f | 1560 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
b700cbb1 | 1561 | return (struct svc_xprt *)svsk; |
e79eff1f | 1562 | } |
1da177e4 LT |
1563 | |
1564 | bummer: | |
1565 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1566 | sock_release(sock); | |
b700cbb1 | 1567 | return ERR_PTR(error); |
1da177e4 LT |
1568 | } |
1569 | ||
755cceab TT |
1570 | /* |
1571 | * Detach the svc_sock from the socket so that no | |
1572 | * more callbacks occur. | |
1573 | */ | |
1574 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1575 | { | |
1576 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1577 | struct sock *sk = svsk->sk_sk; | |
eaefd110 | 1578 | wait_queue_head_t *wq; |
755cceab TT |
1579 | |
1580 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1581 | ||
1582 | /* put back the old socket callbacks */ | |
1583 | sk->sk_state_change = svsk->sk_ostate; | |
1584 | sk->sk_data_ready = svsk->sk_odata; | |
1585 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 | 1586 | |
eaefd110 ED |
1587 | wq = sk_sleep(sk); |
1588 | if (wq && waitqueue_active(wq)) | |
1589 | wake_up_interruptible(wq); | |
69b6ba37 TM |
1590 | } |
1591 | ||
1592 | /* | |
1593 | * Disconnect the socket, and reset the callbacks | |
1594 | */ | |
1595 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1596 | { | |
1597 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1598 | ||
1599 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1600 | ||
1601 | svc_sock_detach(xprt); | |
1602 | ||
31d68ef6 BF |
1603 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1604 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1605 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1606 | } |
755cceab TT |
1607 | } |
1608 | ||
1609 | /* | |
1610 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1611 | */ | |
1612 | static void svc_sock_free(struct svc_xprt *xprt) | |
1613 | { | |
1614 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1615 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1616 | ||
755cceab TT |
1617 | if (svsk->sk_sock->file) |
1618 | sockfd_put(svsk->sk_sock); | |
1619 | else | |
1620 | sock_release(svsk->sk_sock); | |
1621 | kfree(svsk); | |
1622 | } | |
7652e5a0 | 1623 | |
1f11a034 | 1624 | #if defined(CONFIG_NFS_V4_1) |
7652e5a0 | 1625 | /* |
1f11a034 | 1626 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1627 | */ |
1f11a034 AA |
1628 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1629 | int protocol, | |
1630 | struct net *net, | |
1631 | struct sockaddr *sin, int len, | |
1632 | int flags) | |
7652e5a0 BH |
1633 | { |
1634 | struct svc_sock *svsk; | |
1f11a034 AA |
1635 | struct svc_xprt *xprt; |
1636 | ||
1637 | if (protocol != IPPROTO_TCP) { | |
1638 | printk(KERN_WARNING "svc: only TCP sockets" | |
1639 | " supported on shared back channel\n"); | |
1640 | return ERR_PTR(-EINVAL); | |
1641 | } | |
7652e5a0 | 1642 | |
7652e5a0 BH |
1643 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1644 | if (!svsk) | |
1f11a034 | 1645 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1646 | |
1647 | xprt = &svsk->sk_xprt; | |
1f11a034 AA |
1648 | svc_xprt_init(&svc_tcp_bc_class, xprt, serv); |
1649 | ||
4a19de0f | 1650 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1651 | |
7652e5a0 BH |
1652 | return xprt; |
1653 | } | |
7652e5a0 BH |
1654 | |
1655 | /* | |
1f11a034 | 1656 | * Free a back channel svc_sock. |
7652e5a0 | 1657 | */ |
1f11a034 | 1658 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1659 | { |
778be232 | 1660 | if (xprt) |
7652e5a0 BH |
1661 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1662 | } | |
1f11a034 | 1663 | #endif /* CONFIG_NFS_V4_1 */ |