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> |
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 TT |
66 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
67 | struct sockaddr *, int, int); | |
ed07536e PZ |
68 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
69 | static struct lock_class_key svc_key[2]; | |
70 | static struct lock_class_key svc_slock_key[2]; | |
71 | ||
0f0257ea | 72 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
73 | { |
74 | struct sock *sk = sock->sk; | |
02b3d346 | 75 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
76 | switch (sk->sk_family) { |
77 | case AF_INET: | |
78 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
79 | &svc_slock_key[0], |
80 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
81 | &svc_key[0]); | |
ed07536e PZ |
82 | break; |
83 | ||
84 | case AF_INET6: | |
85 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
86 | &svc_slock_key[1], |
87 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
88 | &svc_key[1]); | |
ed07536e PZ |
89 | break; |
90 | ||
91 | default: | |
92 | BUG(); | |
93 | } | |
94 | } | |
95 | #else | |
0f0257ea | 96 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
97 | { |
98 | } | |
99 | #endif | |
100 | ||
1da177e4 LT |
101 | /* |
102 | * Release an skbuff after use | |
103 | */ | |
5148bf4e | 104 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 105 | { |
5148bf4e | 106 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
107 | |
108 | if (skb) { | |
57b1d3ba TT |
109 | struct svc_sock *svsk = |
110 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 111 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
112 | |
113 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 114 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 115 | } |
1da177e4 LT |
116 | } |
117 | ||
b92503b2 CL |
118 | union svc_pktinfo_u { |
119 | struct in_pktinfo pkti; | |
b92503b2 | 120 | struct in6_pktinfo pkti6; |
b92503b2 | 121 | }; |
bc375ea7 DM |
122 | #define SVC_PKTINFO_SPACE \ |
123 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
124 | |
125 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
126 | { | |
57b1d3ba TT |
127 | struct svc_sock *svsk = |
128 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
129 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
130 | case AF_INET: { |
131 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
132 | ||
133 | cmh->cmsg_level = SOL_IP; | |
134 | cmh->cmsg_type = IP_PKTINFO; | |
135 | pki->ipi_ifindex = 0; | |
136 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
137 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
138 | } | |
139 | break; | |
5a05ed73 | 140 | |
b92503b2 CL |
141 | case AF_INET6: { |
142 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
143 | ||
144 | cmh->cmsg_level = SOL_IPV6; | |
145 | cmh->cmsg_type = IPV6_PKTINFO; | |
146 | pki->ipi6_ifindex = 0; | |
147 | ipv6_addr_copy(&pki->ipi6_addr, | |
148 | &rqstp->rq_daddr.addr6); | |
149 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
150 | } | |
151 | break; | |
b92503b2 | 152 | } |
b92503b2 CL |
153 | } |
154 | ||
1da177e4 | 155 | /* |
4cfc7e60 | 156 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 157 | */ |
4cfc7e60 RI |
158 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
159 | struct page *headpage, unsigned long headoffset, | |
160 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 161 | { |
1da177e4 LT |
162 | int result; |
163 | int size; | |
164 | struct page **ppage = xdr->pages; | |
165 | size_t base = xdr->page_base; | |
166 | unsigned int pglen = xdr->page_len; | |
167 | unsigned int flags = MSG_MORE; | |
4cfc7e60 RI |
168 | int slen; |
169 | int len = 0; | |
1da177e4 LT |
170 | |
171 | slen = xdr->len; | |
172 | ||
1da177e4 LT |
173 | /* send head */ |
174 | if (slen == xdr->head[0].iov_len) | |
175 | flags = 0; | |
4cfc7e60 | 176 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 177 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
178 | if (len != xdr->head[0].iov_len) |
179 | goto out; | |
180 | slen -= xdr->head[0].iov_len; | |
181 | if (slen == 0) | |
182 | goto out; | |
183 | ||
184 | /* send page data */ | |
185 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
186 | while (pglen > 0) { | |
187 | if (slen == size) | |
188 | flags = 0; | |
e6242e92 | 189 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
190 | if (result > 0) |
191 | len += result; | |
192 | if (result != size) | |
193 | goto out; | |
194 | slen -= size; | |
195 | pglen -= size; | |
196 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
197 | base = 0; | |
198 | ppage++; | |
199 | } | |
4cfc7e60 | 200 | |
1da177e4 LT |
201 | /* send tail */ |
202 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
203 | result = kernel_sendpage(sock, tailpage, tailoffset, |
204 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
205 | if (result > 0) |
206 | len += result; | |
207 | } | |
4cfc7e60 RI |
208 | |
209 | out: | |
210 | return len; | |
211 | } | |
212 | ||
213 | ||
214 | /* | |
215 | * Generic sendto routine | |
216 | */ | |
217 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
218 | { | |
219 | struct svc_sock *svsk = | |
220 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
221 | struct socket *sock = svsk->sk_sock; | |
222 | union { | |
223 | struct cmsghdr hdr; | |
224 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
225 | } buffer; | |
226 | struct cmsghdr *cmh = &buffer.hdr; | |
227 | int len = 0; | |
228 | unsigned long tailoff; | |
229 | unsigned long headoff; | |
230 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
231 | ||
232 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
233 | struct msghdr msg = { | |
234 | .msg_name = &rqstp->rq_addr, | |
235 | .msg_namelen = rqstp->rq_addrlen, | |
236 | .msg_control = cmh, | |
237 | .msg_controllen = sizeof(buffer), | |
238 | .msg_flags = MSG_MORE, | |
239 | }; | |
240 | ||
241 | svc_set_cmsg_data(rqstp, cmh); | |
242 | ||
243 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
244 | goto out; | |
245 | } | |
246 | ||
247 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
248 | headoff = 0; | |
249 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
250 | rqstp->rq_respages[0], tailoff); | |
251 | ||
1da177e4 | 252 | out: |
ad06e4bd | 253 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 254 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 255 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
256 | |
257 | return len; | |
258 | } | |
259 | ||
80212d59 N |
260 | /* |
261 | * Report socket names for nfsdfs | |
262 | */ | |
e7942b9f | 263 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 264 | { |
017cb47f CL |
265 | const struct sock *sk = svsk->sk_sk; |
266 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
267 | "udp" : "tcp"; | |
80212d59 N |
268 | int len; |
269 | ||
017cb47f | 270 | switch (sk->sk_family) { |
e7942b9f CL |
271 | case PF_INET: |
272 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 273 | proto_name, |
c720c7e8 ED |
274 | &inet_sk(sk)->inet_rcv_saddr, |
275 | inet_sk(sk)->inet_num); | |
80212d59 | 276 | break; |
58de2f86 CL |
277 | case PF_INET6: |
278 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f CL |
279 | proto_name, |
280 | &inet6_sk(sk)->rcv_saddr, | |
c720c7e8 | 281 | inet_sk(sk)->inet_num); |
80212d59 N |
282 | break; |
283 | default: | |
e7942b9f | 284 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 285 | sk->sk_family); |
80212d59 | 286 | } |
e7942b9f CL |
287 | |
288 | if (len >= remaining) { | |
289 | *buf = '\0'; | |
290 | return -ENAMETOOLONG; | |
80212d59 N |
291 | } |
292 | return len; | |
293 | } | |
294 | ||
8435d34d CL |
295 | /** |
296 | * svc_sock_names - construct a list of listener names in a string | |
297 | * @serv: pointer to RPC service | |
298 | * @buf: pointer to a buffer to fill in with socket names | |
299 | * @buflen: size of the buffer to be filled | |
300 | * @toclose: pointer to '\0'-terminated C string containing the name | |
301 | * of a listener to be closed | |
302 | * | |
303 | * Fills in @buf with a '\n'-separated list of names of listener | |
304 | * sockets. If @toclose is not NULL, the socket named by @toclose | |
305 | * is closed, and is not included in the output list. | |
306 | * | |
307 | * Returns positive length of the socket name string, or a negative | |
308 | * errno value on error. | |
309 | */ | |
310 | int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen, | |
311 | const char *toclose) | |
80212d59 | 312 | { |
b41b66d6 | 313 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
314 | int len = 0; |
315 | ||
316 | if (!serv) | |
317 | return 0; | |
e7942b9f | 318 | |
aaf68cfb | 319 | spin_lock_bh(&serv->sv_lock); |
7a182083 | 320 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
e7942b9f CL |
321 | int onelen = svc_one_sock_name(svsk, buf + len, buflen - len); |
322 | if (onelen < 0) { | |
323 | len = onelen; | |
324 | break; | |
325 | } | |
326 | if (toclose && strcmp(toclose, buf + len) == 0) | |
b41b66d6 N |
327 | closesk = svsk; |
328 | else | |
329 | len += onelen; | |
80212d59 | 330 | } |
aaf68cfb | 331 | spin_unlock_bh(&serv->sv_lock); |
e7942b9f | 332 | |
b41b66d6 | 333 | if (closesk) |
5680c446 N |
334 | /* Should unregister with portmap, but you cannot |
335 | * unregister just one protocol... | |
336 | */ | |
7a182083 | 337 | svc_close_xprt(&closesk->sk_xprt); |
37a03472 N |
338 | else if (toclose) |
339 | return -ENOENT; | |
80212d59 N |
340 | return len; |
341 | } | |
24c3767e | 342 | EXPORT_SYMBOL_GPL(svc_sock_names); |
80212d59 | 343 | |
1da177e4 LT |
344 | /* |
345 | * Check input queue length | |
346 | */ | |
0f0257ea | 347 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 348 | { |
1da177e4 LT |
349 | struct socket *sock = svsk->sk_sock; |
350 | int avail, err; | |
351 | ||
e6242e92 | 352 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
353 | |
354 | return (err >= 0)? avail : err; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Generic recvfrom routine. | |
359 | */ | |
0f0257ea TT |
360 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
361 | int buflen) | |
1da177e4 | 362 | { |
57b1d3ba TT |
363 | struct svc_sock *svsk = |
364 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
365 | struct msghdr msg = { |
366 | .msg_flags = MSG_DONTWAIT, | |
367 | }; | |
368 | int len; | |
1da177e4 | 369 | |
260c1d12 TT |
370 | rqstp->rq_xprt_hlen = 0; |
371 | ||
1ba95105 CL |
372 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
373 | msg.msg_flags); | |
1da177e4 | 374 | |
1da177e4 | 375 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 376 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
377 | return len; |
378 | } | |
379 | ||
380 | /* | |
381 | * Set socket snd and rcv buffer lengths | |
382 | */ | |
0f0257ea TT |
383 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
384 | unsigned int rcv) | |
1da177e4 LT |
385 | { |
386 | #if 0 | |
387 | mm_segment_t oldfs; | |
388 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
389 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
390 | (char*)&snd, sizeof(snd)); | |
391 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
392 | (char*)&rcv, sizeof(rcv)); | |
393 | #else | |
394 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
395 | * which isn't acceptable. Until that is made conditional | |
396 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
397 | * DaveM said I could! | |
398 | */ | |
399 | lock_sock(sock->sk); | |
400 | sock->sk->sk_sndbuf = snd * 2; | |
401 | sock->sk->sk_rcvbuf = rcv * 2; | |
7f421835 | 402 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; |
47fcb03f | 403 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
404 | release_sock(sock->sk); |
405 | #endif | |
406 | } | |
407 | /* | |
408 | * INET callback when data has been received on the socket. | |
409 | */ | |
0f0257ea | 410 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 411 | { |
939bb7ef | 412 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 413 | |
939bb7ef NB |
414 | if (svsk) { |
415 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
416 | svsk, sk, count, |
417 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
418 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 419 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 420 | } |
aa395145 ED |
421 | if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) |
422 | wake_up_interruptible(sk_sleep(sk)); | |
1da177e4 LT |
423 | } |
424 | ||
425 | /* | |
426 | * INET callback when space is newly available on the socket. | |
427 | */ | |
0f0257ea | 428 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
429 | { |
430 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
431 | ||
432 | if (svsk) { | |
433 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 434 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 435 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
436 | } |
437 | ||
aa395145 | 438 | if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) { |
939bb7ef | 439 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 | 440 | svsk); |
aa395145 | 441 | wake_up_interruptible(sk_sleep(sk)); |
1da177e4 LT |
442 | } |
443 | } | |
444 | ||
47fcb03f TM |
445 | static void svc_tcp_write_space(struct sock *sk) |
446 | { | |
447 | struct socket *sock = sk->sk_socket; | |
448 | ||
449 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) | |
450 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
451 | svc_write_space(sk); | |
452 | } | |
453 | ||
7702ce40 CL |
454 | /* |
455 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
456 | */ | |
457 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
458 | struct cmsghdr *cmh) | |
459 | { | |
460 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
461 | if (cmh->cmsg_type != IP_PKTINFO) | |
462 | return 0; | |
463 | rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; | |
464 | return 1; | |
465 | } | |
466 | ||
467 | /* | |
468 | * See net/ipv6/datagram.c : datagram_recv_ctl | |
469 | */ | |
470 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
471 | struct cmsghdr *cmh) | |
472 | { | |
473 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
474 | if (cmh->cmsg_type != IPV6_PKTINFO) | |
475 | return 0; | |
476 | ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); | |
477 | return 1; | |
478 | } | |
479 | ||
9dbc240f TT |
480 | /* |
481 | * Copy the UDP datagram's destination address to the rqstp structure. | |
482 | * The 'destination' address in this case is the address to which the | |
483 | * peer sent the datagram, i.e. our local address. For multihomed | |
484 | * hosts, this can change from msg to msg. Note that only the IP | |
485 | * address changes, the port number should remain the same. | |
486 | */ | |
7702ce40 CL |
487 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
488 | struct cmsghdr *cmh) | |
95756482 | 489 | { |
7702ce40 CL |
490 | switch (cmh->cmsg_level) { |
491 | case SOL_IP: | |
492 | return svc_udp_get_dest_address4(rqstp, cmh); | |
493 | case SOL_IPV6: | |
494 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 495 | } |
7702ce40 CL |
496 | |
497 | return 0; | |
95756482 CL |
498 | } |
499 | ||
1da177e4 LT |
500 | /* |
501 | * Receive a datagram from a UDP socket. | |
502 | */ | |
0f0257ea | 503 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 504 | { |
57b1d3ba TT |
505 | struct svc_sock *svsk = |
506 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 507 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 508 | struct sk_buff *skb; |
bc375ea7 DM |
509 | union { |
510 | struct cmsghdr hdr; | |
511 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
512 | } buffer; | |
513 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
514 | struct msghdr msg = { |
515 | .msg_name = svc_addr(rqstp), | |
516 | .msg_control = cmh, | |
517 | .msg_controllen = sizeof(buffer), | |
518 | .msg_flags = MSG_DONTWAIT, | |
519 | }; | |
abc5c44d CL |
520 | size_t len; |
521 | int err; | |
1da177e4 | 522 | |
02fc6c36 | 523 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
524 | /* udp sockets need large rcvbuf as all pending |
525 | * requests are still in that buffer. sndbuf must | |
526 | * also be large enough that there is enough space | |
3262c816 GB |
527 | * for one reply per thread. We count all threads |
528 | * rather than threads in a particular pool, which | |
529 | * provides an upper bound on the number of threads | |
530 | * which will access the socket. | |
1da177e4 LT |
531 | */ |
532 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
533 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
534 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 535 | |
02fc6c36 | 536 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
537 | skb = NULL; |
538 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
539 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
540 | if (err >= 0) | |
541 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
542 | ||
543 | if (skb == NULL) { | |
544 | if (err != -EAGAIN) { | |
545 | /* possibly an icmp error */ | |
546 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 547 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 548 | } |
05ed690e | 549 | return -EAGAIN; |
1da177e4 | 550 | } |
9dbc240f | 551 | len = svc_addr_len(svc_addr(rqstp)); |
abc5c44d CL |
552 | if (len == 0) |
553 | return -EAFNOSUPPORT; | |
9dbc240f | 554 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
555 | if (skb->tstamp.tv64 == 0) { |
556 | skb->tstamp = ktime_get_real(); | |
cca5172a | 557 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
558 | need that much accuracy */ |
559 | } | |
b7aa0bf7 | 560 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 561 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 562 | |
1da177e4 LT |
563 | len = skb->len - sizeof(struct udphdr); |
564 | rqstp->rq_arg.len = len; | |
565 | ||
95756482 | 566 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 567 | |
7702ce40 | 568 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
7a37f578 | 569 | if (net_ratelimit()) |
7702ce40 CL |
570 | printk(KERN_WARNING |
571 | "svc: received unknown control message %d/%d; " | |
572 | "dropping RPC reply datagram\n", | |
573 | cmh->cmsg_level, cmh->cmsg_type); | |
9d410c79 | 574 | skb_free_datagram_locked(svsk->sk_sk, skb); |
7a37f578 N |
575 | return 0; |
576 | } | |
1da177e4 LT |
577 | |
578 | if (skb_is_nonlinear(skb)) { | |
579 | /* we have to copy */ | |
580 | local_bh_disable(); | |
581 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
582 | local_bh_enable(); | |
583 | /* checksum error */ | |
9d410c79 | 584 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
585 | return 0; |
586 | } | |
587 | local_bh_enable(); | |
9d410c79 | 588 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
589 | } else { |
590 | /* we can use it in-place */ | |
0f0257ea TT |
591 | rqstp->rq_arg.head[0].iov_base = skb->data + |
592 | sizeof(struct udphdr); | |
1da177e4 | 593 | rqstp->rq_arg.head[0].iov_len = len; |
fb286bb2 | 594 | if (skb_checksum_complete(skb)) { |
9d410c79 | 595 | skb_free_datagram_locked(svsk->sk_sk, skb); |
fb286bb2 | 596 | return 0; |
1da177e4 | 597 | } |
5148bf4e | 598 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
599 | } |
600 | ||
601 | rqstp->rq_arg.page_base = 0; | |
602 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
603 | rqstp->rq_arg.head[0].iov_len = len; | |
604 | rqstp->rq_arg.page_len = 0; | |
44524359 | 605 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
606 | } else { |
607 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 608 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 609 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
610 | } |
611 | ||
612 | if (serv->sv_stats) | |
613 | serv->sv_stats->netudpcnt++; | |
614 | ||
615 | return len; | |
616 | } | |
617 | ||
618 | static int | |
619 | svc_udp_sendto(struct svc_rqst *rqstp) | |
620 | { | |
621 | int error; | |
622 | ||
623 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
624 | if (error == -ECONNREFUSED) | |
625 | /* ICMP error on earlier request. */ | |
626 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
627 | ||
628 | return error; | |
629 | } | |
630 | ||
e831fe65 TT |
631 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
632 | { | |
633 | } | |
634 | ||
323bee32 TT |
635 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
636 | { | |
637 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 638 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
639 | unsigned long required; |
640 | ||
641 | /* | |
642 | * Set the SOCK_NOSPACE flag before checking the available | |
643 | * sock space. | |
644 | */ | |
645 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 646 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
647 | if (required*2 > sock_wspace(svsk->sk_sk)) |
648 | return 0; | |
649 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
650 | return 1; | |
651 | } | |
652 | ||
38a417cc TT |
653 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
654 | { | |
655 | BUG(); | |
656 | return NULL; | |
657 | } | |
658 | ||
b700cbb1 TT |
659 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
660 | struct sockaddr *sa, int salen, | |
661 | int flags) | |
662 | { | |
663 | return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags); | |
664 | } | |
665 | ||
360d8738 | 666 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 667 | .xpo_create = svc_udp_create, |
5d137990 TT |
668 | .xpo_recvfrom = svc_udp_recvfrom, |
669 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 670 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
671 | .xpo_detach = svc_sock_detach, |
672 | .xpo_free = svc_sock_free, | |
e831fe65 | 673 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 674 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 675 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
676 | }; |
677 | ||
678 | static struct svc_xprt_class svc_udp_class = { | |
679 | .xcl_name = "udp", | |
b700cbb1 | 680 | .xcl_owner = THIS_MODULE, |
360d8738 | 681 | .xcl_ops = &svc_udp_ops, |
49023155 | 682 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
683 | }; |
684 | ||
bb5cf160 | 685 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 686 | { |
7702ce40 | 687 | int err, level, optname, one = 1; |
7a37f578 | 688 | |
bb5cf160 | 689 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); |
def13d74 | 690 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
691 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
692 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
693 | |
694 | /* initialise setting must have enough space to | |
cca5172a | 695 | * receive and respond to one request. |
1da177e4 LT |
696 | * svc_udp_recvfrom will re-adjust if necessary |
697 | */ | |
698 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
699 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
700 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 701 | |
0f0257ea TT |
702 | /* data might have come in before data_ready set up */ |
703 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 704 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 705 | |
7a37f578 | 706 | /* make sure we get destination address info */ |
7702ce40 CL |
707 | switch (svsk->sk_sk->sk_family) { |
708 | case AF_INET: | |
709 | level = SOL_IP; | |
710 | optname = IP_PKTINFO; | |
711 | break; | |
712 | case AF_INET6: | |
713 | level = SOL_IPV6; | |
714 | optname = IPV6_RECVPKTINFO; | |
715 | break; | |
716 | default: | |
717 | BUG(); | |
718 | } | |
719 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
720 | (char *)&one, sizeof(one)); | |
721 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
722 | } |
723 | ||
724 | /* | |
725 | * A data_ready event on a listening socket means there's a connection | |
726 | * pending. Do not use state_change as a substitute for it. | |
727 | */ | |
0f0257ea | 728 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 729 | { |
939bb7ef | 730 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
731 | |
732 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 733 | sk, sk->sk_state); |
1da177e4 | 734 | |
939bb7ef NB |
735 | /* |
736 | * This callback may called twice when a new connection | |
737 | * is established as a child socket inherits everything | |
738 | * from a parent LISTEN socket. | |
739 | * 1) data_ready method of the parent socket will be called | |
740 | * when one of child sockets become ESTABLISHED. | |
741 | * 2) data_ready method of the child socket may be called | |
742 | * when it receives data before the socket is accepted. | |
743 | * In case of 2, we should ignore it silently. | |
744 | */ | |
745 | if (sk->sk_state == TCP_LISTEN) { | |
746 | if (svsk) { | |
02fc6c36 | 747 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 748 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
749 | } else |
750 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 751 | } |
939bb7ef | 752 | |
aa395145 ED |
753 | if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) |
754 | wake_up_interruptible_all(sk_sleep(sk)); | |
1da177e4 LT |
755 | } |
756 | ||
757 | /* | |
758 | * A state change on a connected socket means it's dying or dead. | |
759 | */ | |
0f0257ea | 760 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 761 | { |
939bb7ef | 762 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
763 | |
764 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 765 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 766 | |
939bb7ef | 767 | if (!svsk) |
1da177e4 | 768 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 769 | else { |
02fc6c36 | 770 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 771 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 772 | } |
aa395145 ED |
773 | if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) |
774 | wake_up_interruptible_all(sk_sleep(sk)); | |
1da177e4 LT |
775 | } |
776 | ||
0f0257ea | 777 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 778 | { |
939bb7ef | 779 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
780 | |
781 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
782 | sk, sk->sk_user_data); |
783 | if (svsk) { | |
02fc6c36 | 784 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 785 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 786 | } |
aa395145 ED |
787 | if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) |
788 | wake_up_interruptible(sk_sleep(sk)); | |
1da177e4 LT |
789 | } |
790 | ||
791 | /* | |
792 | * Accept a TCP connection | |
793 | */ | |
38a417cc | 794 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 795 | { |
38a417cc | 796 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 797 | struct sockaddr_storage addr; |
798 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 799 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
800 | struct socket *sock = svsk->sk_sock; |
801 | struct socket *newsock; | |
1da177e4 LT |
802 | struct svc_sock *newsvsk; |
803 | int err, slen; | |
5216a8e7 | 804 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
805 | |
806 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
807 | if (!sock) | |
38a417cc | 808 | return NULL; |
1da177e4 | 809 | |
02fc6c36 | 810 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
811 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
812 | if (err < 0) { | |
1da177e4 LT |
813 | if (err == -ENOMEM) |
814 | printk(KERN_WARNING "%s: no more sockets!\n", | |
815 | serv->sv_name); | |
e6242e92 | 816 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
817 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
818 | serv->sv_name, -err); | |
38a417cc | 819 | return NULL; |
1da177e4 | 820 | } |
02fc6c36 | 821 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 822 | |
cdd88b9f | 823 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
824 | if (err < 0) { |
825 | if (net_ratelimit()) | |
826 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
827 | serv->sv_name, -err); | |
828 | goto failed; /* aborted connection or whatever */ | |
829 | } | |
830 | ||
831 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
832 | * hosts here, but when we get encryption, the IP of the host won't |
833 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 834 | */ |
cdd88b9f | 835 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 836 | dprintk(KERN_WARNING |
ad06e4bd | 837 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 838 | serv->sv_name, |
cdd88b9f | 839 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 840 | } |
ad06e4bd | 841 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 842 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
843 | |
844 | /* make sure that a write doesn't block forever when | |
845 | * low on memory | |
846 | */ | |
847 | newsock->sk->sk_sndtimeo = HZ*30; | |
848 | ||
6b174337 CL |
849 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
850 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 851 | goto failed; |
9dbc240f | 852 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
853 | err = kernel_getsockname(newsock, sin, &slen); |
854 | if (unlikely(err < 0)) { | |
855 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
856 | slen = offsetof(struct sockaddr, sa_data); | |
857 | } | |
9dbc240f | 858 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 859 | |
f9f3cc4f TT |
860 | if (serv->sv_stats) |
861 | serv->sv_stats->nettcpconn++; | |
862 | ||
863 | return &newsvsk->sk_xprt; | |
864 | ||
865 | failed: | |
866 | sock_release(newsock); | |
867 | return NULL; | |
868 | } | |
869 | ||
1da177e4 | 870 | /* |
8f55f3c0 AB |
871 | * Receive data. |
872 | * If we haven't gotten the record length yet, get the next four bytes. | |
873 | * Otherwise try to gobble up as much as possible up to the complete | |
874 | * record length. | |
1da177e4 | 875 | */ |
8f55f3c0 | 876 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 877 | { |
bb5cf160 | 878 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
8f55f3c0 | 879 | int len; |
1da177e4 | 880 | |
7f421835 BF |
881 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
882 | /* sndbuf needs to have room for one request | |
883 | * per thread, otherwise we can stall even when the | |
884 | * network isn't a bottleneck. | |
885 | * | |
886 | * We count all threads rather than threads in a | |
887 | * particular pool, which provides an upper bound | |
888 | * on the number of threads which will access the socket. | |
889 | * | |
890 | * rcvbuf just needs to be able to hold a few requests. | |
891 | * Normally they will be removed from the queue | |
892 | * as soon a a complete request arrives. | |
893 | */ | |
894 | svc_sock_setbufsize(svsk->sk_sock, | |
895 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, | |
896 | 3 * serv->sv_max_mesg); | |
897 | ||
02fc6c36 | 898 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 899 | |
c0401ea0 CL |
900 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
901 | int want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; | |
1da177e4 LT |
902 | struct kvec iov; |
903 | ||
904 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; | |
905 | iov.iov_len = want; | |
906 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
907 | goto error; | |
908 | svsk->sk_tcplen += len; | |
909 | ||
910 | if (len < want) { | |
c0401ea0 CL |
911 | dprintk("svc: short recvfrom while reading record " |
912 | "length (%d of %d)\n", len, want); | |
8f55f3c0 | 913 | goto err_again; /* record header not complete */ |
1da177e4 LT |
914 | } |
915 | ||
916 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
c0401ea0 | 917 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { |
1da177e4 LT |
918 | /* FIXME: technically, a record can be fragmented, |
919 | * and non-terminal fragments will not have the top | |
920 | * bit set in the fragment length header. | |
921 | * But apparently no known nfs clients send fragmented | |
922 | * records. */ | |
34e9a63b | 923 | if (net_ratelimit()) |
c0401ea0 CL |
924 | printk(KERN_NOTICE "RPC: multiple fragments " |
925 | "per record not supported\n"); | |
1da177e4 LT |
926 | goto err_delete; |
927 | } | |
8f55f3c0 | 928 | |
c0401ea0 | 929 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; |
1da177e4 | 930 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); |
c6b0a9f8 | 931 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b | 932 | if (net_ratelimit()) |
c0401ea0 CL |
933 | printk(KERN_NOTICE "RPC: " |
934 | "fragment too large: 0x%08lx\n", | |
935 | (unsigned long)svsk->sk_reclen); | |
1da177e4 LT |
936 | goto err_delete; |
937 | } | |
938 | } | |
939 | ||
940 | /* Check whether enough data is available */ | |
941 | len = svc_recv_available(svsk); | |
942 | if (len < 0) | |
943 | goto error; | |
944 | ||
945 | if (len < svsk->sk_reclen) { | |
946 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
947 | len, svsk->sk_reclen); | |
8f55f3c0 | 948 | goto err_again; /* record not complete */ |
1da177e4 LT |
949 | } |
950 | len = svsk->sk_reclen; | |
02fc6c36 | 951 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 952 | |
8f55f3c0 AB |
953 | return len; |
954 | error: | |
b48fa6b9 | 955 | if (len == -EAGAIN) |
8f55f3c0 | 956 | dprintk("RPC: TCP recv_record got EAGAIN\n"); |
8f55f3c0 AB |
957 | return len; |
958 | err_delete: | |
959 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
960 | err_again: | |
961 | return -EAGAIN; | |
962 | } | |
963 | ||
4cfc7e60 RI |
964 | static int svc_process_calldir(struct svc_sock *svsk, struct svc_rqst *rqstp, |
965 | struct rpc_rqst **reqpp, struct kvec *vec) | |
966 | { | |
967 | struct rpc_rqst *req = NULL; | |
968 | u32 *p; | |
969 | u32 xid; | |
970 | u32 calldir; | |
971 | int len; | |
972 | ||
973 | len = svc_recvfrom(rqstp, vec, 1, 8); | |
974 | if (len < 0) | |
975 | goto error; | |
976 | ||
977 | p = (u32 *)rqstp->rq_arg.head[0].iov_base; | |
978 | xid = *p++; | |
979 | calldir = *p; | |
980 | ||
981 | if (calldir == 0) { | |
982 | /* REQUEST is the most common case */ | |
983 | vec[0] = rqstp->rq_arg.head[0]; | |
984 | } else { | |
985 | /* REPLY */ | |
986 | if (svsk->sk_bc_xprt) | |
987 | req = xprt_lookup_rqst(svsk->sk_bc_xprt, xid); | |
988 | ||
989 | if (!req) { | |
990 | printk(KERN_NOTICE | |
991 | "%s: Got unrecognized reply: " | |
992 | "calldir 0x%x sk_bc_xprt %p xid %08x\n", | |
993 | __func__, ntohl(calldir), | |
994 | svsk->sk_bc_xprt, xid); | |
995 | vec[0] = rqstp->rq_arg.head[0]; | |
996 | goto out; | |
997 | } | |
998 | ||
999 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, | |
1000 | sizeof(struct xdr_buf)); | |
1001 | /* copy the xid and call direction */ | |
1002 | memcpy(req->rq_private_buf.head[0].iov_base, | |
1003 | rqstp->rq_arg.head[0].iov_base, 8); | |
1004 | vec[0] = req->rq_private_buf.head[0]; | |
1005 | } | |
1006 | out: | |
1007 | vec[0].iov_base += 8; | |
1008 | vec[0].iov_len -= 8; | |
1009 | len = svsk->sk_reclen - 8; | |
1010 | error: | |
1011 | *reqpp = req; | |
1012 | return len; | |
1013 | } | |
1014 | ||
8f55f3c0 AB |
1015 | /* |
1016 | * Receive data from a TCP socket. | |
1017 | */ | |
1018 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1019 | { | |
1020 | struct svc_sock *svsk = | |
1021 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1022 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1023 | int len; | |
1024 | struct kvec *vec; | |
1025 | int pnum, vlen; | |
4cfc7e60 | 1026 | struct rpc_rqst *req = NULL; |
8f55f3c0 AB |
1027 | |
1028 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1029 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1030 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1031 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1032 | ||
1033 | len = svc_tcp_recv_record(svsk, rqstp); | |
1034 | if (len < 0) | |
1035 | goto error; | |
1036 | ||
3cc03b16 | 1037 | vec = rqstp->rq_vec; |
1da177e4 LT |
1038 | vec[0] = rqstp->rq_arg.head[0]; |
1039 | vlen = PAGE_SIZE; | |
4cfc7e60 RI |
1040 | |
1041 | /* | |
1042 | * We have enough data for the whole tcp record. Let's try and read the | |
1043 | * first 8 bytes to get the xid and the call direction. We can use this | |
1044 | * to figure out if this is a call or a reply to a callback. If | |
1045 | * sk_reclen is < 8 (xid and calldir), then this is a malformed packet. | |
1046 | * In that case, don't bother with the calldir and just read the data. | |
1047 | * It will be rejected in svc_process. | |
1048 | */ | |
1049 | if (len >= 8) { | |
1050 | len = svc_process_calldir(svsk, rqstp, &req, vec); | |
1051 | if (len < 0) | |
1052 | goto err_again; | |
1053 | vlen -= 8; | |
1054 | } | |
1055 | ||
1da177e4 LT |
1056 | pnum = 1; |
1057 | while (vlen < len) { | |
4cfc7e60 RI |
1058 | vec[pnum].iov_base = (req) ? |
1059 | page_address(req->rq_private_buf.pages[pnum - 1]) : | |
1060 | page_address(rqstp->rq_pages[pnum]); | |
1da177e4 LT |
1061 | vec[pnum].iov_len = PAGE_SIZE; |
1062 | pnum++; | |
1063 | vlen += PAGE_SIZE; | |
1064 | } | |
44524359 | 1065 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1066 | |
1067 | /* Now receive data */ | |
1068 | len = svc_recvfrom(rqstp, vec, pnum, len); | |
1069 | if (len < 0) | |
8f55f3c0 | 1070 | goto err_again; |
1da177e4 | 1071 | |
4cfc7e60 RI |
1072 | /* |
1073 | * Account for the 8 bytes we read earlier | |
1074 | */ | |
1075 | len += 8; | |
1076 | ||
1077 | if (req) { | |
1078 | xprt_complete_rqst(req->rq_task, len); | |
1079 | len = 0; | |
1080 | goto out; | |
1081 | } | |
1da177e4 LT |
1082 | dprintk("svc: TCP complete record (%d bytes)\n", len); |
1083 | rqstp->rq_arg.len = len; | |
1084 | rqstp->rq_arg.page_base = 0; | |
1085 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
1086 | rqstp->rq_arg.head[0].iov_len = len; | |
1087 | rqstp->rq_arg.page_len = 0; | |
1088 | } else { | |
1089 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
1090 | } | |
1091 | ||
5148bf4e | 1092 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
1093 | rqstp->rq_prot = IPPROTO_TCP; |
1094 | ||
4cfc7e60 | 1095 | out: |
1da177e4 LT |
1096 | /* Reset TCP read info */ |
1097 | svsk->sk_reclen = 0; | |
1098 | svsk->sk_tcplen = 0; | |
1099 | ||
9dbc240f | 1100 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1101 | if (serv->sv_stats) |
1102 | serv->sv_stats->nettcpcnt++; | |
1103 | ||
1104 | return len; | |
1105 | ||
8f55f3c0 | 1106 | err_again: |
1da177e4 LT |
1107 | if (len == -EAGAIN) { |
1108 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
8f55f3c0 AB |
1109 | return len; |
1110 | } | |
1111 | error: | |
1112 | if (len != -EAGAIN) { | |
1da177e4 | 1113 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
bb5cf160 | 1114 | svsk->sk_xprt.xpt_server->sv_name, -len); |
8f55f3c0 | 1115 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1116 | } |
8f55f3c0 | 1117 | return -EAGAIN; |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | /* | |
1121 | * Send out data on TCP socket. | |
1122 | */ | |
0f0257ea | 1123 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1124 | { |
1125 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1126 | int sent; | |
d8ed029d | 1127 | __be32 reclen; |
1da177e4 LT |
1128 | |
1129 | /* Set up the first element of the reply kvec. | |
1130 | * Any other kvecs that may be in use have been taken | |
1131 | * care of by the server implementation itself. | |
1132 | */ | |
1133 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1134 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1135 | ||
57b1d3ba | 1136 | if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags)) |
1da177e4 LT |
1137 | return -ENOTCONN; |
1138 | ||
1139 | sent = svc_sendto(rqstp, &rqstp->rq_res); | |
1140 | if (sent != xbufp->len) { | |
0f0257ea TT |
1141 | printk(KERN_NOTICE |
1142 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1143 | "- shutting down socket\n", | |
57b1d3ba | 1144 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1145 | (sent<0)?"got error":"sent only", |
1146 | sent, xbufp->len); | |
57b1d3ba | 1147 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1148 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1149 | sent = -EAGAIN; |
1150 | } | |
1151 | return sent; | |
1152 | } | |
1153 | ||
e831fe65 TT |
1154 | /* |
1155 | * Setup response header. TCP has a 4B record length field. | |
1156 | */ | |
1157 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1158 | { | |
1159 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1160 | ||
1161 | /* tcp needs a space for the record length... */ | |
1162 | svc_putnl(resv, 0); | |
1163 | } | |
1164 | ||
323bee32 TT |
1165 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
1166 | { | |
57b1d3ba | 1167 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
47fcb03f | 1168 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 | 1169 | int required; |
323bee32 | 1170 | |
47fcb03f TM |
1171 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
1172 | return 1; | |
1173 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
1174 | if (sk_stream_wspace(svsk->sk_sk) >= required) | |
1175 | return 1; | |
323bee32 | 1176 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
47fcb03f | 1177 | return 0; |
323bee32 TT |
1178 | } |
1179 | ||
b700cbb1 TT |
1180 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
1181 | struct sockaddr *sa, int salen, | |
1182 | int flags) | |
1183 | { | |
1184 | return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags); | |
1185 | } | |
1186 | ||
360d8738 | 1187 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1188 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1189 | .xpo_recvfrom = svc_tcp_recvfrom, |
1190 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1191 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1192 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1193 | .xpo_free = svc_sock_free, |
e831fe65 | 1194 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1195 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1196 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1197 | }; |
1198 | ||
1199 | static struct svc_xprt_class svc_tcp_class = { | |
1200 | .xcl_name = "tcp", | |
b700cbb1 | 1201 | .xcl_owner = THIS_MODULE, |
360d8738 | 1202 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1203 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1204 | }; |
1205 | ||
1206 | void svc_init_xprt_sock(void) | |
1207 | { | |
1208 | svc_reg_xprt_class(&svc_tcp_class); | |
1209 | svc_reg_xprt_class(&svc_udp_class); | |
1210 | } | |
1211 | ||
1212 | void svc_cleanup_xprt_sock(void) | |
1213 | { | |
1214 | svc_unreg_xprt_class(&svc_tcp_class); | |
1215 | svc_unreg_xprt_class(&svc_udp_class); | |
1216 | } | |
1217 | ||
bb5cf160 | 1218 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1219 | { |
1220 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1221 | |
bb5cf160 | 1222 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); |
def13d74 | 1223 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1224 | if (sk->sk_state == TCP_LISTEN) { |
1225 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1226 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1227 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1228 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1229 | } else { |
1230 | dprintk("setting up TCP socket for reading\n"); | |
1231 | sk->sk_state_change = svc_tcp_state_change; | |
1232 | sk->sk_data_ready = svc_tcp_data_ready; | |
47fcb03f | 1233 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1234 | |
1235 | svsk->sk_reclen = 0; | |
1236 | svsk->sk_tcplen = 0; | |
1237 | ||
b7872fe8 | 1238 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1239 | |
7f421835 BF |
1240 | /* initialise setting must have enough space to |
1241 | * receive and respond to one request. | |
1242 | * svc_tcp_recvfrom will re-adjust if necessary | |
1243 | */ | |
1244 | svc_sock_setbufsize(svsk->sk_sock, | |
1245 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, | |
1246 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1247 | ||
1248 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 1249 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1250 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1251 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1252 | } |
1253 | } | |
1254 | ||
0f0257ea | 1255 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1256 | { |
1257 | /* | |
1258 | * The number of server threads has changed. Update | |
1259 | * rcvbuf and sndbuf accordingly on all sockets | |
1260 | */ | |
1261 | struct list_head *le; | |
1262 | ||
1263 | spin_lock_bh(&serv->sv_lock); | |
1264 | list_for_each(le, &serv->sv_permsocks) { | |
cca5172a | 1265 | struct svc_sock *svsk = |
7a182083 | 1266 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1267 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1268 | } |
1269 | list_for_each(le, &serv->sv_tempsocks) { | |
1270 | struct svc_sock *svsk = | |
7a182083 | 1271 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1272 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1273 | } |
1274 | spin_unlock_bh(&serv->sv_lock); | |
1275 | } | |
24c3767e | 1276 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1277 | |
1da177e4 LT |
1278 | /* |
1279 | * Initialize socket for RPC use and create svc_sock struct | |
1280 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1281 | */ | |
6b174337 CL |
1282 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1283 | struct socket *sock, | |
1284 | int *errp, int flags) | |
1da177e4 LT |
1285 | { |
1286 | struct svc_sock *svsk; | |
1287 | struct sock *inet; | |
6b174337 | 1288 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 LT |
1289 | |
1290 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1291 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1292 | *errp = -ENOMEM; |
1293 | return NULL; | |
1294 | } | |
1da177e4 LT |
1295 | |
1296 | inet = sock->sk; | |
1297 | ||
1298 | /* Register socket with portmapper */ | |
1299 | if (*errp >= 0 && pmap_register) | |
baf01caf | 1300 | *errp = svc_register(serv, inet->sk_family, inet->sk_protocol, |
c720c7e8 | 1301 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 LT |
1302 | |
1303 | if (*errp < 0) { | |
1304 | kfree(svsk); | |
1305 | return NULL; | |
1306 | } | |
1307 | ||
1da177e4 LT |
1308 | inet->sk_user_data = svsk; |
1309 | svsk->sk_sock = sock; | |
1310 | svsk->sk_sk = inet; | |
1311 | svsk->sk_ostate = inet->sk_state_change; | |
1312 | svsk->sk_odata = inet->sk_data_ready; | |
1313 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1314 | |
1315 | /* Initialize the socket */ | |
1316 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1317 | svc_udp_init(svsk, serv); |
7f421835 | 1318 | else |
bb5cf160 | 1319 | svc_tcp_init(svsk, serv); |
1da177e4 | 1320 | |
1da177e4 LT |
1321 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1322 | svsk, svsk->sk_sk); | |
1323 | ||
1da177e4 LT |
1324 | return svsk; |
1325 | } | |
1326 | ||
bfba9ab4 CL |
1327 | /** |
1328 | * svc_addsock - add a listener socket to an RPC service | |
1329 | * @serv: pointer to RPC service to which to add a new listener | |
1330 | * @fd: file descriptor of the new listener | |
1331 | * @name_return: pointer to buffer to fill in with name of listener | |
1332 | * @len: size of the buffer | |
1333 | * | |
1334 | * Fills in socket name and returns positive length of name if successful. | |
1335 | * Name is terminated with '\n'. On error, returns a negative errno | |
1336 | * value. | |
1337 | */ | |
1338 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1339 | const size_t len) | |
b41b66d6 N |
1340 | { |
1341 | int err = 0; | |
1342 | struct socket *so = sockfd_lookup(fd, &err); | |
1343 | struct svc_sock *svsk = NULL; | |
1344 | ||
1345 | if (!so) | |
1346 | return err; | |
205ba423 | 1347 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
b41b66d6 N |
1348 | err = -EAFNOSUPPORT; |
1349 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1350 | so->sk->sk_protocol != IPPROTO_UDP) | |
1351 | err = -EPROTONOSUPPORT; | |
1352 | else if (so->state > SS_UNCONNECTED) | |
1353 | err = -EISCONN; | |
1354 | else { | |
2da2c21d TT |
1355 | if (!try_module_get(THIS_MODULE)) |
1356 | err = -ENOENT; | |
1357 | else | |
1358 | svsk = svc_setup_socket(serv, so, &err, | |
1359 | SVC_SOCK_DEFAULTS); | |
e79eff1f | 1360 | if (svsk) { |
9dbc240f TT |
1361 | struct sockaddr_storage addr; |
1362 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1363 | int salen; | |
1364 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1365 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
4e5caaa5 TT |
1366 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
1367 | spin_lock_bh(&serv->sv_lock); | |
1368 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1369 | spin_unlock_bh(&serv->sv_lock); | |
a6046f71 | 1370 | svc_xprt_received(&svsk->sk_xprt); |
b41b66d6 | 1371 | err = 0; |
2da2c21d TT |
1372 | } else |
1373 | module_put(THIS_MODULE); | |
b41b66d6 N |
1374 | } |
1375 | if (err) { | |
1376 | sockfd_put(so); | |
1377 | return err; | |
1378 | } | |
e7942b9f | 1379 | return svc_one_sock_name(svsk, name_return, len); |
b41b66d6 N |
1380 | } |
1381 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1382 | ||
1da177e4 LT |
1383 | /* |
1384 | * Create socket for RPC service. | |
1385 | */ | |
b700cbb1 TT |
1386 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1387 | int protocol, | |
1388 | struct sockaddr *sin, int len, | |
1389 | int flags) | |
1da177e4 LT |
1390 | { |
1391 | struct svc_sock *svsk; | |
1392 | struct socket *sock; | |
1393 | int error; | |
1394 | int type; | |
9dbc240f TT |
1395 | struct sockaddr_storage addr; |
1396 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1397 | int newlen; | |
c69da774 TM |
1398 | int family; |
1399 | int val; | |
5216a8e7 | 1400 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1401 | |
ad06e4bd CL |
1402 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1403 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1404 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1405 | |
1406 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1407 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1408 | "sockets supported\n"); | |
b700cbb1 | 1409 | return ERR_PTR(-EINVAL); |
1da177e4 | 1410 | } |
c69da774 | 1411 | |
1da177e4 | 1412 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1413 | switch (sin->sa_family) { |
1414 | case AF_INET6: | |
1415 | family = PF_INET6; | |
1416 | break; | |
1417 | case AF_INET: | |
1418 | family = PF_INET; | |
1419 | break; | |
1420 | default: | |
1421 | return ERR_PTR(-EINVAL); | |
1422 | } | |
1da177e4 | 1423 | |
c69da774 | 1424 | error = sock_create_kern(family, type, protocol, &sock); |
77f1f67a | 1425 | if (error < 0) |
b700cbb1 | 1426 | return ERR_PTR(error); |
1da177e4 | 1427 | |
ed07536e PZ |
1428 | svc_reclassify_socket(sock); |
1429 | ||
c69da774 TM |
1430 | /* |
1431 | * If this is an PF_INET6 listener, we want to avoid | |
1432 | * getting requests from IPv4 remotes. Those should | |
1433 | * be shunted to a PF_INET listener via rpcbind. | |
1434 | */ | |
1435 | val = 1; | |
1436 | if (family == PF_INET6) | |
1437 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1438 | (char *)&val, sizeof(val)); | |
1439 | ||
18114746 | 1440 | if (type == SOCK_STREAM) |
77f1f67a CL |
1441 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
1442 | error = kernel_bind(sock, sin, len); | |
18114746 ES |
1443 | if (error < 0) |
1444 | goto bummer; | |
1da177e4 | 1445 | |
9dbc240f TT |
1446 | newlen = len; |
1447 | error = kernel_getsockname(sock, newsin, &newlen); | |
1448 | if (error < 0) | |
1449 | goto bummer; | |
1450 | ||
1da177e4 | 1451 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1452 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1453 | goto bummer; |
1454 | } | |
1455 | ||
e79eff1f | 1456 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
9dbc240f | 1457 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
b700cbb1 | 1458 | return (struct svc_xprt *)svsk; |
e79eff1f | 1459 | } |
1da177e4 LT |
1460 | |
1461 | bummer: | |
1462 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1463 | sock_release(sock); | |
b700cbb1 | 1464 | return ERR_PTR(error); |
1da177e4 LT |
1465 | } |
1466 | ||
755cceab TT |
1467 | /* |
1468 | * Detach the svc_sock from the socket so that no | |
1469 | * more callbacks occur. | |
1470 | */ | |
1471 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1472 | { | |
1473 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1474 | struct sock *sk = svsk->sk_sk; | |
1475 | ||
1476 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1477 | ||
1478 | /* put back the old socket callbacks */ | |
1479 | sk->sk_state_change = svsk->sk_ostate; | |
1480 | sk->sk_data_ready = svsk->sk_odata; | |
1481 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 | 1482 | |
aa395145 ED |
1483 | if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) |
1484 | wake_up_interruptible(sk_sleep(sk)); | |
69b6ba37 TM |
1485 | } |
1486 | ||
1487 | /* | |
1488 | * Disconnect the socket, and reset the callbacks | |
1489 | */ | |
1490 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1491 | { | |
1492 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1493 | ||
1494 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1495 | ||
1496 | svc_sock_detach(xprt); | |
1497 | ||
1498 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
1499 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); | |
755cceab TT |
1500 | } |
1501 | ||
1502 | /* | |
1503 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1504 | */ | |
1505 | static void svc_sock_free(struct svc_xprt *xprt) | |
1506 | { | |
1507 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1508 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1509 | ||
755cceab TT |
1510 | if (svsk->sk_sock->file) |
1511 | sockfd_put(svsk->sk_sock); | |
1512 | else | |
1513 | sock_release(svsk->sk_sock); | |
1514 | kfree(svsk); | |
1515 | } | |
7652e5a0 BH |
1516 | |
1517 | /* | |
1518 | * Create a svc_xprt. | |
1519 | * | |
1520 | * For internal use only (e.g. nfsv4.1 backchannel). | |
1521 | * Callers should typically use the xpo_create() method. | |
1522 | */ | |
1523 | struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot) | |
1524 | { | |
1525 | struct svc_sock *svsk; | |
1526 | struct svc_xprt *xprt = NULL; | |
1527 | ||
1528 | dprintk("svc: %s\n", __func__); | |
1529 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); | |
1530 | if (!svsk) | |
1531 | goto out; | |
1532 | ||
1533 | xprt = &svsk->sk_xprt; | |
1534 | if (prot == IPPROTO_TCP) | |
1535 | svc_xprt_init(&svc_tcp_class, xprt, serv); | |
1536 | else if (prot == IPPROTO_UDP) | |
1537 | svc_xprt_init(&svc_udp_class, xprt, serv); | |
1538 | else | |
1539 | BUG(); | |
1540 | out: | |
1541 | dprintk("svc: %s return %p\n", __func__, xprt); | |
1542 | return xprt; | |
1543 | } | |
1544 | EXPORT_SYMBOL_GPL(svc_sock_create); | |
1545 | ||
1546 | /* | |
1547 | * Destroy a svc_sock. | |
1548 | */ | |
1549 | void svc_sock_destroy(struct svc_xprt *xprt) | |
1550 | { | |
1551 | if (xprt) | |
1552 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); | |
1553 | } | |
1554 | EXPORT_SYMBOL_GPL(svc_sock_destroy); |