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 | 23 | #include <linux/sched.h> |
3a9a231d | 24 | #include <linux/module.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/fcntl.h> | |
27 | #include <linux/net.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/inet.h> | |
30 | #include <linux/udp.h> | |
91483c4b | 31 | #include <linux/tcp.h> |
1da177e4 LT |
32 | #include <linux/unistd.h> |
33 | #include <linux/slab.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/skbuff.h> | |
b41b66d6 | 36 | #include <linux/file.h> |
7dfb7103 | 37 | #include <linux/freezer.h> |
1da177e4 LT |
38 | #include <net/sock.h> |
39 | #include <net/checksum.h> | |
40 | #include <net/ip.h> | |
b92503b2 | 41 | #include <net/ipv6.h> |
b7872fe8 | 42 | #include <net/tcp.h> |
c752f073 | 43 | #include <net/tcp_states.h> |
1da177e4 LT |
44 | #include <asm/uaccess.h> |
45 | #include <asm/ioctls.h> | |
22911fc5 | 46 | #include <trace/events/skb.h> |
1da177e4 LT |
47 | |
48 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 49 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 50 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 51 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
52 | #include <linux/sunrpc/svcsock.h> |
53 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 54 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 55 | |
177e4f99 HS |
56 | #include "sunrpc.h" |
57 | ||
360d8738 | 58 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
59 | |
60 | ||
61 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
72c35376 | 62 | int flags); |
1da177e4 LT |
63 | static void svc_udp_data_ready(struct sock *, int); |
64 | static int svc_udp_recvfrom(struct svc_rqst *); | |
65 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 66 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 67 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 68 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 69 | |
b700cbb1 | 70 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
71 | struct net *, struct sockaddr *, |
72 | int, int); | |
9e00abc3 | 73 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
74 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
75 | struct net *, struct sockaddr *, | |
76 | int, int); | |
77 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
9e00abc3 | 78 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 79 | |
ed07536e PZ |
80 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
81 | static struct lock_class_key svc_key[2]; | |
82 | static struct lock_class_key svc_slock_key[2]; | |
83 | ||
0f0257ea | 84 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
85 | { |
86 | struct sock *sk = sock->sk; | |
02b3d346 | 87 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
88 | switch (sk->sk_family) { |
89 | case AF_INET: | |
90 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
91 | &svc_slock_key[0], |
92 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
93 | &svc_key[0]); | |
ed07536e PZ |
94 | break; |
95 | ||
96 | case AF_INET6: | |
97 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
98 | &svc_slock_key[1], |
99 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
100 | &svc_key[1]); | |
ed07536e PZ |
101 | break; |
102 | ||
103 | default: | |
104 | BUG(); | |
105 | } | |
106 | } | |
107 | #else | |
0f0257ea | 108 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
109 | { |
110 | } | |
111 | #endif | |
112 | ||
1da177e4 LT |
113 | /* |
114 | * Release an skbuff after use | |
115 | */ | |
5148bf4e | 116 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 117 | { |
5148bf4e | 118 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
119 | |
120 | if (skb) { | |
57b1d3ba TT |
121 | struct svc_sock *svsk = |
122 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 123 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
124 | |
125 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 126 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 127 | } |
1da177e4 LT |
128 | } |
129 | ||
b92503b2 CL |
130 | union svc_pktinfo_u { |
131 | struct in_pktinfo pkti; | |
b92503b2 | 132 | struct in6_pktinfo pkti6; |
b92503b2 | 133 | }; |
bc375ea7 DM |
134 | #define SVC_PKTINFO_SPACE \ |
135 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
136 | |
137 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
138 | { | |
57b1d3ba TT |
139 | struct svc_sock *svsk = |
140 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
141 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
142 | case AF_INET: { |
143 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
144 | ||
145 | cmh->cmsg_level = SOL_IP; | |
146 | cmh->cmsg_type = IP_PKTINFO; | |
147 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
148 | pki->ipi_spec_dst.s_addr = |
149 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
150 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
151 | } | |
152 | break; | |
5a05ed73 | 153 | |
b92503b2 CL |
154 | case AF_INET6: { |
155 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 156 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
157 | |
158 | cmh->cmsg_level = SOL_IPV6; | |
159 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 | 160 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
4e3fd7a0 | 161 | pki->ipi6_addr = daddr->sin6_addr; |
b92503b2 CL |
162 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
163 | } | |
164 | break; | |
b92503b2 | 165 | } |
b92503b2 CL |
166 | } |
167 | ||
1da177e4 | 168 | /* |
4cfc7e60 | 169 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 170 | */ |
4cfc7e60 RI |
171 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
172 | struct page *headpage, unsigned long headoffset, | |
173 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 174 | { |
1da177e4 LT |
175 | int result; |
176 | int size; | |
177 | struct page **ppage = xdr->pages; | |
178 | size_t base = xdr->page_base; | |
179 | unsigned int pglen = xdr->page_len; | |
180 | unsigned int flags = MSG_MORE; | |
4cfc7e60 RI |
181 | int slen; |
182 | int len = 0; | |
1da177e4 LT |
183 | |
184 | slen = xdr->len; | |
185 | ||
1da177e4 LT |
186 | /* send head */ |
187 | if (slen == xdr->head[0].iov_len) | |
188 | flags = 0; | |
4cfc7e60 | 189 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 190 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
191 | if (len != xdr->head[0].iov_len) |
192 | goto out; | |
193 | slen -= xdr->head[0].iov_len; | |
194 | if (slen == 0) | |
195 | goto out; | |
196 | ||
197 | /* send page data */ | |
198 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
199 | while (pglen > 0) { | |
200 | if (slen == size) | |
201 | flags = 0; | |
e6242e92 | 202 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
203 | if (result > 0) |
204 | len += result; | |
205 | if (result != size) | |
206 | goto out; | |
207 | slen -= size; | |
208 | pglen -= size; | |
209 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
210 | base = 0; | |
211 | ppage++; | |
212 | } | |
4cfc7e60 | 213 | |
1da177e4 LT |
214 | /* send tail */ |
215 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
216 | result = kernel_sendpage(sock, tailpage, tailoffset, |
217 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
218 | if (result > 0) |
219 | len += result; | |
220 | } | |
4cfc7e60 RI |
221 | |
222 | out: | |
223 | return len; | |
224 | } | |
225 | ||
226 | ||
227 | /* | |
228 | * Generic sendto routine | |
229 | */ | |
230 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
231 | { | |
232 | struct svc_sock *svsk = | |
233 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
234 | struct socket *sock = svsk->sk_sock; | |
235 | union { | |
236 | struct cmsghdr hdr; | |
237 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
238 | } buffer; | |
239 | struct cmsghdr *cmh = &buffer.hdr; | |
240 | int len = 0; | |
241 | unsigned long tailoff; | |
242 | unsigned long headoff; | |
243 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
244 | ||
245 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
246 | struct msghdr msg = { | |
247 | .msg_name = &rqstp->rq_addr, | |
248 | .msg_namelen = rqstp->rq_addrlen, | |
249 | .msg_control = cmh, | |
250 | .msg_controllen = sizeof(buffer), | |
251 | .msg_flags = MSG_MORE, | |
252 | }; | |
253 | ||
254 | svc_set_cmsg_data(rqstp, cmh); | |
255 | ||
256 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
257 | goto out; | |
258 | } | |
259 | ||
260 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
261 | headoff = 0; | |
262 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
263 | rqstp->rq_respages[0], tailoff); | |
264 | ||
1da177e4 | 265 | out: |
ad06e4bd | 266 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 267 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 268 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
269 | |
270 | return len; | |
271 | } | |
272 | ||
80212d59 N |
273 | /* |
274 | * Report socket names for nfsdfs | |
275 | */ | |
e7942b9f | 276 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 277 | { |
017cb47f CL |
278 | const struct sock *sk = svsk->sk_sk; |
279 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
280 | "udp" : "tcp"; | |
80212d59 N |
281 | int len; |
282 | ||
017cb47f | 283 | switch (sk->sk_family) { |
e7942b9f CL |
284 | case PF_INET: |
285 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 286 | proto_name, |
c720c7e8 ED |
287 | &inet_sk(sk)->inet_rcv_saddr, |
288 | inet_sk(sk)->inet_num); | |
80212d59 | 289 | break; |
58de2f86 CL |
290 | case PF_INET6: |
291 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f CL |
292 | proto_name, |
293 | &inet6_sk(sk)->rcv_saddr, | |
c720c7e8 | 294 | inet_sk(sk)->inet_num); |
80212d59 N |
295 | break; |
296 | default: | |
e7942b9f | 297 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 298 | sk->sk_family); |
80212d59 | 299 | } |
e7942b9f CL |
300 | |
301 | if (len >= remaining) { | |
302 | *buf = '\0'; | |
303 | return -ENAMETOOLONG; | |
80212d59 N |
304 | } |
305 | return len; | |
306 | } | |
307 | ||
1da177e4 LT |
308 | /* |
309 | * Check input queue length | |
310 | */ | |
0f0257ea | 311 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 312 | { |
1da177e4 LT |
313 | struct socket *sock = svsk->sk_sock; |
314 | int avail, err; | |
315 | ||
e6242e92 | 316 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
317 | |
318 | return (err >= 0)? avail : err; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Generic recvfrom routine. | |
323 | */ | |
0f0257ea TT |
324 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
325 | int buflen) | |
1da177e4 | 326 | { |
57b1d3ba TT |
327 | struct svc_sock *svsk = |
328 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
329 | struct msghdr msg = { |
330 | .msg_flags = MSG_DONTWAIT, | |
331 | }; | |
332 | int len; | |
1da177e4 | 333 | |
260c1d12 TT |
334 | rqstp->rq_xprt_hlen = 0; |
335 | ||
1ba95105 CL |
336 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
337 | msg.msg_flags); | |
1da177e4 | 338 | |
1da177e4 | 339 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 340 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
341 | return len; |
342 | } | |
343 | ||
31d68ef6 BF |
344 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
345 | struct kvec *iov, int nr, | |
346 | int buflen, unsigned int base) | |
347 | { | |
348 | size_t save_iovlen; | |
09acfea5 | 349 | void *save_iovbase; |
31d68ef6 BF |
350 | unsigned int i; |
351 | int ret; | |
352 | ||
353 | if (base == 0) | |
354 | return svc_recvfrom(rqstp, iov, nr, buflen); | |
355 | ||
356 | for (i = 0; i < nr; i++) { | |
357 | if (iov[i].iov_len > base) | |
358 | break; | |
359 | base -= iov[i].iov_len; | |
360 | } | |
361 | save_iovlen = iov[i].iov_len; | |
362 | save_iovbase = iov[i].iov_base; | |
363 | iov[i].iov_len -= base; | |
364 | iov[i].iov_base += base; | |
365 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); | |
366 | iov[i].iov_len = save_iovlen; | |
367 | iov[i].iov_base = save_iovbase; | |
368 | return ret; | |
369 | } | |
370 | ||
1da177e4 LT |
371 | /* |
372 | * Set socket snd and rcv buffer lengths | |
373 | */ | |
0f0257ea TT |
374 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
375 | unsigned int rcv) | |
1da177e4 LT |
376 | { |
377 | #if 0 | |
378 | mm_segment_t oldfs; | |
379 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
380 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
381 | (char*)&snd, sizeof(snd)); | |
382 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
383 | (char*)&rcv, sizeof(rcv)); | |
384 | #else | |
385 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
386 | * which isn't acceptable. Until that is made conditional | |
387 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
388 | * DaveM said I could! | |
389 | */ | |
390 | lock_sock(sock->sk); | |
391 | sock->sk->sk_sndbuf = snd * 2; | |
392 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 393 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
394 | release_sock(sock->sk); |
395 | #endif | |
396 | } | |
397 | /* | |
398 | * INET callback when data has been received on the socket. | |
399 | */ | |
0f0257ea | 400 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 401 | { |
939bb7ef | 402 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 403 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 | 404 | |
939bb7ef NB |
405 | if (svsk) { |
406 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
407 | svsk, sk, count, |
408 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
409 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 410 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 411 | } |
eaefd110 ED |
412 | if (wq && waitqueue_active(wq)) |
413 | wake_up_interruptible(wq); | |
1da177e4 LT |
414 | } |
415 | ||
416 | /* | |
417 | * INET callback when space is newly available on the socket. | |
418 | */ | |
0f0257ea | 419 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
420 | { |
421 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
eaefd110 | 422 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
423 | |
424 | if (svsk) { | |
425 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 426 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 427 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
428 | } |
429 | ||
eaefd110 | 430 | if (wq && waitqueue_active(wq)) { |
939bb7ef | 431 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 | 432 | svsk); |
eaefd110 | 433 | wake_up_interruptible(wq); |
1da177e4 LT |
434 | } |
435 | } | |
436 | ||
47fcb03f TM |
437 | static void svc_tcp_write_space(struct sock *sk) |
438 | { | |
439 | struct socket *sock = sk->sk_socket; | |
440 | ||
441 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) | |
442 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
443 | svc_write_space(sk); | |
444 | } | |
445 | ||
7702ce40 CL |
446 | /* |
447 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
448 | */ | |
449 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
450 | struct cmsghdr *cmh) | |
451 | { | |
452 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
453 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
454 | ||
7702ce40 CL |
455 | if (cmh->cmsg_type != IP_PKTINFO) |
456 | return 0; | |
849a1cf1 MJ |
457 | |
458 | daddr->sin_family = AF_INET; | |
459 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
460 | return 1; |
461 | } | |
462 | ||
463 | /* | |
464 | * See net/ipv6/datagram.c : datagram_recv_ctl | |
465 | */ | |
466 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
467 | struct cmsghdr *cmh) | |
468 | { | |
469 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
470 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
471 | ||
7702ce40 CL |
472 | if (cmh->cmsg_type != IPV6_PKTINFO) |
473 | return 0; | |
849a1cf1 MJ |
474 | |
475 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 476 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 477 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
478 | return 1; |
479 | } | |
480 | ||
9dbc240f TT |
481 | /* |
482 | * Copy the UDP datagram's destination address to the rqstp structure. | |
483 | * The 'destination' address in this case is the address to which the | |
484 | * peer sent the datagram, i.e. our local address. For multihomed | |
485 | * hosts, this can change from msg to msg. Note that only the IP | |
486 | * address changes, the port number should remain the same. | |
487 | */ | |
7702ce40 CL |
488 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
489 | struct cmsghdr *cmh) | |
95756482 | 490 | { |
7702ce40 CL |
491 | switch (cmh->cmsg_level) { |
492 | case SOL_IP: | |
493 | return svc_udp_get_dest_address4(rqstp, cmh); | |
494 | case SOL_IPV6: | |
495 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 496 | } |
7702ce40 CL |
497 | |
498 | return 0; | |
95756482 CL |
499 | } |
500 | ||
1da177e4 LT |
501 | /* |
502 | * Receive a datagram from a UDP socket. | |
503 | */ | |
0f0257ea | 504 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 505 | { |
57b1d3ba TT |
506 | struct svc_sock *svsk = |
507 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 508 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 509 | struct sk_buff *skb; |
bc375ea7 DM |
510 | union { |
511 | struct cmsghdr hdr; | |
512 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
513 | } buffer; | |
514 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
515 | struct msghdr msg = { |
516 | .msg_name = svc_addr(rqstp), | |
517 | .msg_control = cmh, | |
518 | .msg_controllen = sizeof(buffer), | |
519 | .msg_flags = MSG_DONTWAIT, | |
520 | }; | |
abc5c44d CL |
521 | size_t len; |
522 | int err; | |
1da177e4 | 523 | |
02fc6c36 | 524 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
525 | /* udp sockets need large rcvbuf as all pending |
526 | * requests are still in that buffer. sndbuf must | |
527 | * also be large enough that there is enough space | |
3262c816 GB |
528 | * for one reply per thread. We count all threads |
529 | * rather than threads in a particular pool, which | |
530 | * provides an upper bound on the number of threads | |
531 | * which will access the socket. | |
1da177e4 LT |
532 | */ |
533 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
534 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
535 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 536 | |
02fc6c36 | 537 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
538 | skb = NULL; |
539 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
540 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
541 | if (err >= 0) | |
542 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
543 | ||
544 | if (skb == NULL) { | |
545 | if (err != -EAGAIN) { | |
546 | /* possibly an icmp error */ | |
547 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 548 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 549 | } |
9f9d2ebe | 550 | return 0; |
1da177e4 | 551 | } |
9dbc240f | 552 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 553 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
554 | if (skb->tstamp.tv64 == 0) { |
555 | skb->tstamp = ktime_get_real(); | |
cca5172a | 556 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
557 | need that much accuracy */ |
558 | } | |
b7aa0bf7 | 559 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 560 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 561 | |
1da177e4 LT |
562 | len = skb->len - sizeof(struct udphdr); |
563 | rqstp->rq_arg.len = len; | |
564 | ||
95756482 | 565 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 566 | |
7702ce40 | 567 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
568 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
569 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 570 | goto out_free; |
7a37f578 | 571 | } |
849a1cf1 | 572 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
573 | |
574 | if (skb_is_nonlinear(skb)) { | |
575 | /* we have to copy */ | |
576 | local_bh_disable(); | |
577 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
578 | local_bh_enable(); | |
579 | /* checksum error */ | |
22911fc5 | 580 | goto out_free; |
1da177e4 LT |
581 | } |
582 | local_bh_enable(); | |
9d410c79 | 583 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
584 | } else { |
585 | /* we can use it in-place */ | |
0f0257ea TT |
586 | rqstp->rq_arg.head[0].iov_base = skb->data + |
587 | sizeof(struct udphdr); | |
1da177e4 | 588 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
589 | if (skb_checksum_complete(skb)) |
590 | goto out_free; | |
5148bf4e | 591 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
592 | } |
593 | ||
594 | rqstp->rq_arg.page_base = 0; | |
595 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
596 | rqstp->rq_arg.head[0].iov_len = len; | |
597 | rqstp->rq_arg.page_len = 0; | |
44524359 | 598 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
599 | } else { |
600 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 601 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 602 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
603 | } |
604 | ||
605 | if (serv->sv_stats) | |
606 | serv->sv_stats->netudpcnt++; | |
607 | ||
608 | return len; | |
f23abfdb BF |
609 | out_free: |
610 | trace_kfree_skb(skb, svc_udp_recvfrom); | |
611 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
612 | return 0; | |
1da177e4 LT |
613 | } |
614 | ||
615 | static int | |
616 | svc_udp_sendto(struct svc_rqst *rqstp) | |
617 | { | |
618 | int error; | |
619 | ||
620 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
621 | if (error == -ECONNREFUSED) | |
622 | /* ICMP error on earlier request. */ | |
623 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
624 | ||
625 | return error; | |
626 | } | |
627 | ||
e831fe65 TT |
628 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
629 | { | |
630 | } | |
631 | ||
323bee32 TT |
632 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
633 | { | |
634 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 635 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
636 | unsigned long required; |
637 | ||
638 | /* | |
639 | * Set the SOCK_NOSPACE flag before checking the available | |
640 | * sock space. | |
641 | */ | |
642 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 643 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
644 | if (required*2 > sock_wspace(svsk->sk_sk)) |
645 | return 0; | |
646 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
647 | return 1; | |
648 | } | |
649 | ||
38a417cc TT |
650 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
651 | { | |
652 | BUG(); | |
653 | return NULL; | |
654 | } | |
655 | ||
b700cbb1 | 656 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 657 | struct net *net, |
b700cbb1 TT |
658 | struct sockaddr *sa, int salen, |
659 | int flags) | |
660 | { | |
62832c03 | 661 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
662 | } |
663 | ||
360d8738 | 664 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 665 | .xpo_create = svc_udp_create, |
5d137990 TT |
666 | .xpo_recvfrom = svc_udp_recvfrom, |
667 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 668 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
669 | .xpo_detach = svc_sock_detach, |
670 | .xpo_free = svc_sock_free, | |
e831fe65 | 671 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 672 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 673 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
674 | }; |
675 | ||
676 | static struct svc_xprt_class svc_udp_class = { | |
677 | .xcl_name = "udp", | |
b700cbb1 | 678 | .xcl_owner = THIS_MODULE, |
360d8738 | 679 | .xcl_ops = &svc_udp_ops, |
49023155 | 680 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
681 | }; |
682 | ||
bb5cf160 | 683 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 684 | { |
7702ce40 | 685 | int err, level, optname, one = 1; |
7a37f578 | 686 | |
bd4620dd SK |
687 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
688 | &svsk->sk_xprt, serv); | |
def13d74 | 689 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
690 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
691 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
692 | |
693 | /* initialise setting must have enough space to | |
cca5172a | 694 | * receive and respond to one request. |
1da177e4 LT |
695 | * svc_udp_recvfrom will re-adjust if necessary |
696 | */ | |
697 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
698 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
699 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 700 | |
0f0257ea TT |
701 | /* data might have come in before data_ready set up */ |
702 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 703 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 704 | |
7a37f578 | 705 | /* make sure we get destination address info */ |
7702ce40 CL |
706 | switch (svsk->sk_sk->sk_family) { |
707 | case AF_INET: | |
708 | level = SOL_IP; | |
709 | optname = IP_PKTINFO; | |
710 | break; | |
711 | case AF_INET6: | |
712 | level = SOL_IPV6; | |
713 | optname = IPV6_RECVPKTINFO; | |
714 | break; | |
715 | default: | |
716 | BUG(); | |
717 | } | |
718 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
719 | (char *)&one, sizeof(one)); | |
720 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
721 | } |
722 | ||
723 | /* | |
724 | * A data_ready event on a listening socket means there's a connection | |
725 | * pending. Do not use state_change as a substitute for it. | |
726 | */ | |
0f0257ea | 727 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 728 | { |
939bb7ef | 729 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 730 | wait_queue_head_t *wq; |
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 | |
eaefd110 ED |
753 | wq = sk_sleep(sk); |
754 | if (wq && waitqueue_active(wq)) | |
755 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
756 | } |
757 | ||
758 | /* | |
759 | * A state change on a connected socket means it's dying or dead. | |
760 | */ | |
0f0257ea | 761 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 762 | { |
939bb7ef | 763 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 764 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
765 | |
766 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 767 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 768 | |
939bb7ef | 769 | if (!svsk) |
1da177e4 | 770 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 771 | else { |
02fc6c36 | 772 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 773 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 774 | } |
eaefd110 ED |
775 | if (wq && waitqueue_active(wq)) |
776 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
777 | } |
778 | ||
0f0257ea | 779 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 780 | { |
939bb7ef | 781 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 782 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
783 | |
784 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
785 | sk, sk->sk_user_data); |
786 | if (svsk) { | |
02fc6c36 | 787 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 788 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 789 | } |
eaefd110 ED |
790 | if (wq && waitqueue_active(wq)) |
791 | wake_up_interruptible(wq); | |
1da177e4 LT |
792 | } |
793 | ||
794 | /* | |
795 | * Accept a TCP connection | |
796 | */ | |
38a417cc | 797 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 798 | { |
38a417cc | 799 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 800 | struct sockaddr_storage addr; |
801 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 802 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
803 | struct socket *sock = svsk->sk_sock; |
804 | struct socket *newsock; | |
1da177e4 LT |
805 | struct svc_sock *newsvsk; |
806 | int err, slen; | |
5216a8e7 | 807 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
808 | |
809 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
810 | if (!sock) | |
38a417cc | 811 | return NULL; |
1da177e4 | 812 | |
02fc6c36 | 813 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
814 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
815 | if (err < 0) { | |
1da177e4 LT |
816 | if (err == -ENOMEM) |
817 | printk(KERN_WARNING "%s: no more sockets!\n", | |
818 | serv->sv_name); | |
e87cc472 JP |
819 | else if (err != -EAGAIN) |
820 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
821 | serv->sv_name, -err); | |
38a417cc | 822 | return NULL; |
1da177e4 | 823 | } |
02fc6c36 | 824 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 825 | |
cdd88b9f | 826 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 | 827 | if (err < 0) { |
e87cc472 JP |
828 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
829 | serv->sv_name, -err); | |
1da177e4 LT |
830 | goto failed; /* aborted connection or whatever */ |
831 | } | |
832 | ||
833 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
834 | * hosts here, but when we get encryption, the IP of the host won't |
835 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 836 | */ |
cdd88b9f | 837 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 838 | dprintk(KERN_WARNING |
ad06e4bd | 839 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 840 | serv->sv_name, |
cdd88b9f | 841 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 842 | } |
ad06e4bd | 843 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 844 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
845 | |
846 | /* make sure that a write doesn't block forever when | |
847 | * low on memory | |
848 | */ | |
849 | newsock->sk->sk_sndtimeo = HZ*30; | |
850 | ||
72c35376 BF |
851 | newsvsk = svc_setup_socket(serv, newsock, |
852 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
853 | if (IS_ERR(newsvsk)) | |
1da177e4 | 854 | goto failed; |
9dbc240f | 855 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
856 | err = kernel_getsockname(newsock, sin, &slen); |
857 | if (unlikely(err < 0)) { | |
858 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
859 | slen = offsetof(struct sockaddr, sa_data); | |
860 | } | |
9dbc240f | 861 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 862 | |
f9f3cc4f TT |
863 | if (serv->sv_stats) |
864 | serv->sv_stats->nettcpconn++; | |
865 | ||
866 | return &newsvsk->sk_xprt; | |
867 | ||
868 | failed: | |
869 | sock_release(newsock); | |
870 | return NULL; | |
871 | } | |
872 | ||
31d68ef6 BF |
873 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
874 | { | |
875 | unsigned int i, len, npages; | |
876 | ||
877 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
878 | return 0; | |
879 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
880 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
881 | for (i = 0; i < npages; i++) { | |
882 | if (rqstp->rq_pages[i] != NULL) | |
883 | put_page(rqstp->rq_pages[i]); | |
884 | BUG_ON(svsk->sk_pages[i] == NULL); | |
885 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
886 | svsk->sk_pages[i] = NULL; | |
887 | } | |
888 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
889 | return len; | |
890 | } | |
891 | ||
892 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
893 | { | |
894 | unsigned int i, len, npages; | |
895 | ||
896 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
897 | return; | |
898 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
899 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
900 | for (i = 0; i < npages; i++) { | |
901 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
902 | rqstp->rq_pages[i] = NULL; | |
903 | } | |
904 | } | |
905 | ||
906 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
907 | { | |
908 | unsigned int i, len, npages; | |
909 | ||
910 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
911 | goto out; | |
912 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
913 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
914 | for (i = 0; i < npages; i++) { | |
915 | BUG_ON(svsk->sk_pages[i] == NULL); | |
916 | put_page(svsk->sk_pages[i]); | |
917 | svsk->sk_pages[i] = NULL; | |
918 | } | |
919 | out: | |
920 | svsk->sk_tcplen = 0; | |
921 | } | |
922 | ||
1da177e4 | 923 | /* |
8f55f3c0 AB |
924 | * Receive data. |
925 | * If we haven't gotten the record length yet, get the next four bytes. | |
926 | * Otherwise try to gobble up as much as possible up to the complete | |
927 | * record length. | |
1da177e4 | 928 | */ |
8f55f3c0 | 929 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 930 | { |
bb5cf160 | 931 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 932 | unsigned int want; |
8f55f3c0 | 933 | int len; |
1da177e4 | 934 | |
02fc6c36 | 935 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 936 | |
c0401ea0 | 937 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
938 | struct kvec iov; |
939 | ||
5ee78d48 | 940 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
941 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
942 | iov.iov_len = want; | |
943 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
944 | goto error; | |
945 | svsk->sk_tcplen += len; | |
946 | ||
947 | if (len < want) { | |
c0401ea0 CL |
948 | dprintk("svc: short recvfrom while reading record " |
949 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 950 | return -EAGAIN; |
1da177e4 LT |
951 | } |
952 | ||
953 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
c0401ea0 | 954 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { |
1da177e4 LT |
955 | /* FIXME: technically, a record can be fragmented, |
956 | * and non-terminal fragments will not have the top | |
957 | * bit set in the fragment length header. | |
958 | * But apparently no known nfs clients send fragmented | |
959 | * records. */ | |
e87cc472 | 960 | net_notice_ratelimited("RPC: multiple fragments per record not supported\n"); |
1da177e4 LT |
961 | goto err_delete; |
962 | } | |
8f55f3c0 | 963 | |
c0401ea0 | 964 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; |
1da177e4 | 965 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); |
c6b0a9f8 | 966 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
e87cc472 JP |
967 | net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n", |
968 | (unsigned long)svsk->sk_reclen); | |
1da177e4 LT |
969 | goto err_delete; |
970 | } | |
971 | } | |
972 | ||
cc6c2127 BF |
973 | if (svsk->sk_reclen < 8) |
974 | goto err_delete; /* client is nuts. */ | |
975 | ||
1da177e4 | 976 | len = svsk->sk_reclen; |
1da177e4 | 977 | |
8f55f3c0 | 978 | return len; |
31d68ef6 BF |
979 | error: |
980 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 981 | return len; |
31d68ef6 | 982 | err_delete: |
8f55f3c0 | 983 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
984 | return -EAGAIN; |
985 | } | |
986 | ||
586c52cc | 987 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 988 | { |
586c52cc | 989 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 990 | struct rpc_rqst *req = NULL; |
586c52cc TM |
991 | struct kvec *src, *dst; |
992 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
993 | __be32 xid; |
994 | __be32 calldir; | |
4cfc7e60 | 995 | |
4cfc7e60 RI |
996 | xid = *p++; |
997 | calldir = *p; | |
998 | ||
586c52cc TM |
999 | if (bc_xprt) |
1000 | req = xprt_lookup_rqst(bc_xprt, xid); | |
4cfc7e60 | 1001 | |
586c52cc TM |
1002 | if (!req) { |
1003 | printk(KERN_NOTICE | |
1004 | "%s: Got unrecognized reply: " | |
1005 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1006 | __func__, ntohl(calldir), | |
1007 | bc_xprt, xid); | |
1008 | return -EAGAIN; | |
4cfc7e60 | 1009 | } |
586c52cc TM |
1010 | |
1011 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1012 | /* | |
1013 | * XXX!: cheating for now! Only copying HEAD. | |
1014 | * But we know this is good enough for now (in fact, for any | |
1015 | * callback reply in the forseeable future). | |
1016 | */ | |
1017 | dst = &req->rq_private_buf.head[0]; | |
1018 | src = &rqstp->rq_arg.head[0]; | |
1019 | if (dst->iov_len < src->iov_len) | |
1020 | return -EAGAIN; /* whatever; just giving up. */ | |
1021 | memcpy(dst->iov_base, src->iov_base, src->iov_len); | |
1022 | xprt_complete_rqst(req->rq_task, svsk->sk_reclen); | |
1023 | rqstp->rq_arg.len = 0; | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1028 | { | |
1029 | int i = 0; | |
1030 | int t = 0; | |
1031 | ||
1032 | while (t < len) { | |
1033 | vec[i].iov_base = page_address(pages[i]); | |
1034 | vec[i].iov_len = PAGE_SIZE; | |
1035 | i++; | |
1036 | t += PAGE_SIZE; | |
1037 | } | |
1038 | return i; | |
4cfc7e60 RI |
1039 | } |
1040 | ||
31d68ef6 | 1041 | |
8f55f3c0 AB |
1042 | /* |
1043 | * Receive data from a TCP socket. | |
1044 | */ | |
1045 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1046 | { | |
1047 | struct svc_sock *svsk = | |
1048 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1049 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1050 | int len; | |
1051 | struct kvec *vec; | |
31d68ef6 | 1052 | unsigned int want, base; |
586c52cc TM |
1053 | __be32 *p; |
1054 | __be32 calldir; | |
5ee78d48 | 1055 | int pnum; |
8f55f3c0 AB |
1056 | |
1057 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1058 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1059 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1060 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1061 | ||
1062 | len = svc_tcp_recv_record(svsk, rqstp); | |
1063 | if (len < 0) | |
1064 | goto error; | |
1065 | ||
31d68ef6 BF |
1066 | base = svc_tcp_restore_pages(svsk, rqstp); |
1067 | want = svsk->sk_reclen - base; | |
1068 | ||
3cc03b16 | 1069 | vec = rqstp->rq_vec; |
4cfc7e60 | 1070 | |
586c52cc TM |
1071 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
1072 | svsk->sk_reclen); | |
1073 | ||
44524359 | 1074 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1075 | |
1076 | /* Now receive data */ | |
31d68ef6 BF |
1077 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
1078 | if (len >= 0) | |
1079 | svsk->sk_tcplen += len; | |
1080 | if (len != want) { | |
be1e4444 | 1081 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 BF |
1082 | if (len < 0 && len != -EAGAIN) |
1083 | goto err_other; | |
31d68ef6 BF |
1084 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1085 | svsk->sk_tcplen, svsk->sk_reclen); | |
1086 | goto err_noclose; | |
1087 | } | |
1da177e4 | 1088 | |
5ee78d48 | 1089 | rqstp->rq_arg.len = svsk->sk_reclen; |
1da177e4 | 1090 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1091 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1092 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1093 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1094 | } else |
1095 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1096 | |
5148bf4e | 1097 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
1098 | rqstp->rq_prot = IPPROTO_TCP; |
1099 | ||
586c52cc TM |
1100 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1101 | calldir = p[1]; | |
8985ef0b | 1102 | if (calldir) |
586c52cc | 1103 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1104 | |
1da177e4 LT |
1105 | /* Reset TCP read info */ |
1106 | svsk->sk_reclen = 0; | |
1107 | svsk->sk_tcplen = 0; | |
0601f793 TM |
1108 | /* If we have more data, signal svc_xprt_enqueue() to try again */ |
1109 | if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) | |
1110 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1111 | ||
8985ef0b BF |
1112 | if (len < 0) |
1113 | goto error; | |
1da177e4 | 1114 | |
9dbc240f | 1115 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1116 | if (serv->sv_stats) |
1117 | serv->sv_stats->nettcpcnt++; | |
1118 | ||
31d68ef6 | 1119 | dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); |
5ee78d48 | 1120 | return rqstp->rq_arg.len; |
1da177e4 | 1121 | |
8f55f3c0 | 1122 | error: |
31d68ef6 BF |
1123 | if (len != -EAGAIN) |
1124 | goto err_other; | |
1125 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
9f9d2ebe | 1126 | return 0; |
31d68ef6 BF |
1127 | err_other: |
1128 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
1129 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1130 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1131 | err_noclose: | |
9f9d2ebe | 1132 | return 0; /* record not complete */ |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | /* | |
1136 | * Send out data on TCP socket. | |
1137 | */ | |
0f0257ea | 1138 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1139 | { |
1140 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1141 | int sent; | |
d8ed029d | 1142 | __be32 reclen; |
1da177e4 LT |
1143 | |
1144 | /* Set up the first element of the reply kvec. | |
1145 | * Any other kvecs that may be in use have been taken | |
1146 | * care of by the server implementation itself. | |
1147 | */ | |
1148 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1149 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1150 | ||
1da177e4 LT |
1151 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1152 | if (sent != xbufp->len) { | |
0f0257ea TT |
1153 | printk(KERN_NOTICE |
1154 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1155 | "- shutting down socket\n", | |
57b1d3ba | 1156 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1157 | (sent<0)?"got error":"sent only", |
1158 | sent, xbufp->len); | |
57b1d3ba | 1159 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1160 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1161 | sent = -EAGAIN; |
1162 | } | |
1163 | return sent; | |
1164 | } | |
1165 | ||
e831fe65 TT |
1166 | /* |
1167 | * Setup response header. TCP has a 4B record length field. | |
1168 | */ | |
1169 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1170 | { | |
1171 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1172 | ||
1173 | /* tcp needs a space for the record length... */ | |
1174 | svc_putnl(resv, 0); | |
1175 | } | |
1176 | ||
323bee32 TT |
1177 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
1178 | { | |
57b1d3ba | 1179 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
47fcb03f | 1180 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 | 1181 | int required; |
323bee32 | 1182 | |
47fcb03f TM |
1183 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
1184 | return 1; | |
1185 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
1186 | if (sk_stream_wspace(svsk->sk_sk) >= required) | |
1187 | return 1; | |
323bee32 | 1188 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
47fcb03f | 1189 | return 0; |
323bee32 TT |
1190 | } |
1191 | ||
b700cbb1 | 1192 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1193 | struct net *net, |
b700cbb1 TT |
1194 | struct sockaddr *sa, int salen, |
1195 | int flags) | |
1196 | { | |
62832c03 | 1197 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1198 | } |
1199 | ||
9e00abc3 | 1200 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1201 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1202 | struct net *, struct sockaddr *, | |
1203 | int, int); | |
1204 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1205 | ||
1206 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1207 | struct net *net, | |
1208 | struct sockaddr *sa, int salen, | |
1209 | int flags) | |
1210 | { | |
1211 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1212 | } | |
1213 | ||
1214 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1215 | { | |
1216 | } | |
1217 | ||
1218 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1219 | .xpo_create = svc_bc_tcp_create, | |
1220 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1221 | .xpo_free = svc_bc_sock_free, | |
1222 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
1223 | }; | |
1224 | ||
1225 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1226 | .xcl_name = "tcp-bc", | |
1227 | .xcl_owner = THIS_MODULE, | |
1228 | .xcl_ops = &svc_tcp_bc_ops, | |
1229 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1230 | }; | |
16b2d1e1 AA |
1231 | |
1232 | static void svc_init_bc_xprt_sock(void) | |
1233 | { | |
1234 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1235 | } | |
1236 | ||
1237 | static void svc_cleanup_bc_xprt_sock(void) | |
1238 | { | |
1239 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1240 | } | |
9e00abc3 | 1241 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1242 | static void svc_init_bc_xprt_sock(void) |
1243 | { | |
1244 | } | |
1245 | ||
1246 | static void svc_cleanup_bc_xprt_sock(void) | |
1247 | { | |
1248 | } | |
9e00abc3 | 1249 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1250 | |
360d8738 | 1251 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1252 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1253 | .xpo_recvfrom = svc_tcp_recvfrom, |
1254 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1255 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1256 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1257 | .xpo_free = svc_sock_free, |
e831fe65 | 1258 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1259 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1260 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1261 | }; |
1262 | ||
1263 | static struct svc_xprt_class svc_tcp_class = { | |
1264 | .xcl_name = "tcp", | |
b700cbb1 | 1265 | .xcl_owner = THIS_MODULE, |
360d8738 | 1266 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1267 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1268 | }; |
1269 | ||
1270 | void svc_init_xprt_sock(void) | |
1271 | { | |
1272 | svc_reg_xprt_class(&svc_tcp_class); | |
1273 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1274 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1275 | } |
1276 | ||
1277 | void svc_cleanup_xprt_sock(void) | |
1278 | { | |
1279 | svc_unreg_xprt_class(&svc_tcp_class); | |
1280 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1281 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1282 | } |
1283 | ||
bb5cf160 | 1284 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1285 | { |
1286 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1287 | |
bd4620dd SK |
1288 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1289 | &svsk->sk_xprt, serv); | |
def13d74 | 1290 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1291 | if (sk->sk_state == TCP_LISTEN) { |
1292 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1293 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1294 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1295 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1296 | } else { |
1297 | dprintk("setting up TCP socket for reading\n"); | |
1298 | sk->sk_state_change = svc_tcp_state_change; | |
1299 | sk->sk_data_ready = svc_tcp_data_ready; | |
47fcb03f | 1300 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1301 | |
1302 | svsk->sk_reclen = 0; | |
1303 | svsk->sk_tcplen = 0; | |
31d68ef6 | 1304 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1305 | |
b7872fe8 | 1306 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1307 | |
02fc6c36 | 1308 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1309 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1310 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1311 | } |
1312 | } | |
1313 | ||
0f0257ea | 1314 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1315 | { |
1316 | /* | |
1317 | * The number of server threads has changed. Update | |
1318 | * rcvbuf and sndbuf accordingly on all sockets | |
1319 | */ | |
8f3a6de3 | 1320 | struct svc_sock *svsk; |
1da177e4 LT |
1321 | |
1322 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1323 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1324 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1325 | spin_unlock_bh(&serv->sv_lock); |
1326 | } | |
24c3767e | 1327 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1328 | |
1da177e4 LT |
1329 | /* |
1330 | * Initialize socket for RPC use and create svc_sock struct | |
1331 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1332 | */ | |
6b174337 CL |
1333 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1334 | struct socket *sock, | |
72c35376 | 1335 | int flags) |
1da177e4 LT |
1336 | { |
1337 | struct svc_sock *svsk; | |
1338 | struct sock *inet; | |
6b174337 | 1339 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1340 | int err = 0; |
1da177e4 LT |
1341 | |
1342 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1343 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1344 | if (!svsk) | |
1345 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1346 | |
1347 | inet = sock->sk; | |
1348 | ||
1349 | /* Register socket with portmapper */ | |
72c35376 BF |
1350 | if (pmap_register) |
1351 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1352 | inet->sk_protocol, |
c720c7e8 | 1353 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1354 | |
72c35376 | 1355 | if (err < 0) { |
1da177e4 | 1356 | kfree(svsk); |
72c35376 | 1357 | return ERR_PTR(err); |
1da177e4 LT |
1358 | } |
1359 | ||
1da177e4 LT |
1360 | inet->sk_user_data = svsk; |
1361 | svsk->sk_sock = sock; | |
1362 | svsk->sk_sk = inet; | |
1363 | svsk->sk_ostate = inet->sk_state_change; | |
1364 | svsk->sk_odata = inet->sk_data_ready; | |
1365 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1366 | |
1367 | /* Initialize the socket */ | |
1368 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1369 | svc_udp_init(svsk, serv); |
96604398 OK |
1370 | else { |
1371 | /* initialise setting must have enough space to | |
1372 | * receive and respond to one request. | |
1373 | */ | |
1374 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1375 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1376 | svc_tcp_init(svsk, serv); |
96604398 | 1377 | } |
1da177e4 | 1378 | |
1da177e4 LT |
1379 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1380 | svsk, svsk->sk_sk); | |
1381 | ||
1da177e4 LT |
1382 | return svsk; |
1383 | } | |
1384 | ||
bfba9ab4 CL |
1385 | /** |
1386 | * svc_addsock - add a listener socket to an RPC service | |
1387 | * @serv: pointer to RPC service to which to add a new listener | |
1388 | * @fd: file descriptor of the new listener | |
1389 | * @name_return: pointer to buffer to fill in with name of listener | |
1390 | * @len: size of the buffer | |
1391 | * | |
1392 | * Fills in socket name and returns positive length of name if successful. | |
1393 | * Name is terminated with '\n'. On error, returns a negative errno | |
1394 | * value. | |
1395 | */ | |
1396 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1397 | const size_t len) | |
b41b66d6 N |
1398 | { |
1399 | int err = 0; | |
1400 | struct socket *so = sockfd_lookup(fd, &err); | |
1401 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1402 | struct sockaddr_storage addr; |
1403 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1404 | int salen; | |
b41b66d6 N |
1405 | |
1406 | if (!so) | |
1407 | return err; | |
a8e10078 | 1408 | err = -EAFNOSUPPORT; |
205ba423 | 1409 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1410 | goto out; |
1411 | err = -EPROTONOSUPPORT; | |
1412 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1413 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1414 | goto out; |
1415 | err = -EISCONN; | |
1416 | if (so->state > SS_UNCONNECTED) | |
1417 | goto out; | |
1418 | err = -ENOENT; | |
1419 | if (!try_module_get(THIS_MODULE)) | |
1420 | goto out; | |
1421 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1422 | if (IS_ERR(svsk)) { | |
1423 | module_put(THIS_MODULE); | |
1424 | err = PTR_ERR(svsk); | |
1425 | goto out; | |
b41b66d6 | 1426 | } |
a8e10078 BF |
1427 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
1428 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
39b55301 | 1429 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1430 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1431 | out: |
1432 | sockfd_put(so); | |
1433 | return err; | |
b41b66d6 N |
1434 | } |
1435 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1436 | ||
1da177e4 LT |
1437 | /* |
1438 | * Create socket for RPC service. | |
1439 | */ | |
b700cbb1 TT |
1440 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1441 | int protocol, | |
62832c03 | 1442 | struct net *net, |
b700cbb1 TT |
1443 | struct sockaddr *sin, int len, |
1444 | int flags) | |
1da177e4 LT |
1445 | { |
1446 | struct svc_sock *svsk; | |
1447 | struct socket *sock; | |
1448 | int error; | |
1449 | int type; | |
9dbc240f TT |
1450 | struct sockaddr_storage addr; |
1451 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1452 | int newlen; | |
c69da774 TM |
1453 | int family; |
1454 | int val; | |
5216a8e7 | 1455 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1456 | |
ad06e4bd CL |
1457 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1458 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1459 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1460 | |
1461 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1462 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1463 | "sockets supported\n"); | |
b700cbb1 | 1464 | return ERR_PTR(-EINVAL); |
1da177e4 | 1465 | } |
c69da774 | 1466 | |
1da177e4 | 1467 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1468 | switch (sin->sa_family) { |
1469 | case AF_INET6: | |
1470 | family = PF_INET6; | |
1471 | break; | |
1472 | case AF_INET: | |
1473 | family = PF_INET; | |
1474 | break; | |
1475 | default: | |
1476 | return ERR_PTR(-EINVAL); | |
1477 | } | |
1da177e4 | 1478 | |
14ec63c3 | 1479 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1480 | if (error < 0) |
b700cbb1 | 1481 | return ERR_PTR(error); |
1da177e4 | 1482 | |
ed07536e PZ |
1483 | svc_reclassify_socket(sock); |
1484 | ||
c69da774 TM |
1485 | /* |
1486 | * If this is an PF_INET6 listener, we want to avoid | |
1487 | * getting requests from IPv4 remotes. Those should | |
1488 | * be shunted to a PF_INET listener via rpcbind. | |
1489 | */ | |
1490 | val = 1; | |
1491 | if (family == PF_INET6) | |
1492 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1493 | (char *)&val, sizeof(val)); | |
1494 | ||
18114746 | 1495 | if (type == SOCK_STREAM) |
4a17fd52 | 1496 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1497 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1498 | if (error < 0) |
1499 | goto bummer; | |
1da177e4 | 1500 | |
9dbc240f TT |
1501 | newlen = len; |
1502 | error = kernel_getsockname(sock, newsin, &newlen); | |
1503 | if (error < 0) | |
1504 | goto bummer; | |
1505 | ||
1da177e4 | 1506 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1507 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1508 | goto bummer; |
1509 | } | |
1510 | ||
72c35376 | 1511 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1512 | if (IS_ERR(svsk)) { |
1513 | error = PTR_ERR(svsk); | |
1514 | goto bummer; | |
e79eff1f | 1515 | } |
a8e10078 BF |
1516 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1517 | return (struct svc_xprt *)svsk; | |
1da177e4 LT |
1518 | bummer: |
1519 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1520 | sock_release(sock); | |
b700cbb1 | 1521 | return ERR_PTR(error); |
1da177e4 LT |
1522 | } |
1523 | ||
755cceab TT |
1524 | /* |
1525 | * Detach the svc_sock from the socket so that no | |
1526 | * more callbacks occur. | |
1527 | */ | |
1528 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1529 | { | |
1530 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1531 | struct sock *sk = svsk->sk_sk; | |
eaefd110 | 1532 | wait_queue_head_t *wq; |
755cceab TT |
1533 | |
1534 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1535 | ||
1536 | /* put back the old socket callbacks */ | |
1537 | sk->sk_state_change = svsk->sk_ostate; | |
1538 | sk->sk_data_ready = svsk->sk_odata; | |
1539 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 | 1540 | |
eaefd110 ED |
1541 | wq = sk_sleep(sk); |
1542 | if (wq && waitqueue_active(wq)) | |
1543 | wake_up_interruptible(wq); | |
69b6ba37 TM |
1544 | } |
1545 | ||
1546 | /* | |
1547 | * Disconnect the socket, and reset the callbacks | |
1548 | */ | |
1549 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1550 | { | |
1551 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1552 | ||
1553 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1554 | ||
1555 | svc_sock_detach(xprt); | |
1556 | ||
31d68ef6 BF |
1557 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1558 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1559 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1560 | } |
755cceab TT |
1561 | } |
1562 | ||
1563 | /* | |
1564 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1565 | */ | |
1566 | static void svc_sock_free(struct svc_xprt *xprt) | |
1567 | { | |
1568 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1569 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1570 | ||
755cceab TT |
1571 | if (svsk->sk_sock->file) |
1572 | sockfd_put(svsk->sk_sock); | |
1573 | else | |
1574 | sock_release(svsk->sk_sock); | |
1575 | kfree(svsk); | |
1576 | } | |
7652e5a0 | 1577 | |
9e00abc3 | 1578 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
7652e5a0 | 1579 | /* |
1f11a034 | 1580 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1581 | */ |
1f11a034 AA |
1582 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1583 | int protocol, | |
1584 | struct net *net, | |
1585 | struct sockaddr *sin, int len, | |
1586 | int flags) | |
7652e5a0 BH |
1587 | { |
1588 | struct svc_sock *svsk; | |
1f11a034 AA |
1589 | struct svc_xprt *xprt; |
1590 | ||
1591 | if (protocol != IPPROTO_TCP) { | |
1592 | printk(KERN_WARNING "svc: only TCP sockets" | |
1593 | " supported on shared back channel\n"); | |
1594 | return ERR_PTR(-EINVAL); | |
1595 | } | |
7652e5a0 | 1596 | |
7652e5a0 BH |
1597 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1598 | if (!svsk) | |
1f11a034 | 1599 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1600 | |
1601 | xprt = &svsk->sk_xprt; | |
bd4620dd | 1602 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
1f11a034 | 1603 | |
4a19de0f | 1604 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1605 | |
7652e5a0 BH |
1606 | return xprt; |
1607 | } | |
7652e5a0 BH |
1608 | |
1609 | /* | |
1f11a034 | 1610 | * Free a back channel svc_sock. |
7652e5a0 | 1611 | */ |
1f11a034 | 1612 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1613 | { |
778be232 | 1614 | if (xprt) |
7652e5a0 BH |
1615 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1616 | } | |
9e00abc3 | 1617 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |