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 int svc_udp_recvfrom(struct svc_rqst *); |
64 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 65 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 66 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 67 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 68 | |
b700cbb1 | 69 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
70 | struct net *, struct sockaddr *, |
71 | int, int); | |
9e00abc3 | 72 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
73 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
74 | struct net *, struct sockaddr *, | |
75 | int, int); | |
76 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
9e00abc3 | 77 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 78 | |
ed07536e PZ |
79 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
80 | static struct lock_class_key svc_key[2]; | |
81 | static struct lock_class_key svc_slock_key[2]; | |
82 | ||
0f0257ea | 83 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
84 | { |
85 | struct sock *sk = sock->sk; | |
1b7a1819 | 86 | |
fafc4e1e | 87 | if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) |
1b7a1819 WAA |
88 | return; |
89 | ||
ed07536e PZ |
90 | switch (sk->sk_family) { |
91 | case AF_INET: | |
92 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
93 | &svc_slock_key[0], |
94 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
95 | &svc_key[0]); | |
ed07536e PZ |
96 | break; |
97 | ||
98 | case AF_INET6: | |
99 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
100 | &svc_slock_key[1], |
101 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
102 | &svc_key[1]); | |
ed07536e PZ |
103 | break; |
104 | ||
105 | default: | |
106 | BUG(); | |
107 | } | |
108 | } | |
109 | #else | |
0f0257ea | 110 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
111 | { |
112 | } | |
113 | #endif | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * Release an skbuff after use | |
117 | */ | |
5148bf4e | 118 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 119 | { |
5148bf4e | 120 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
121 | |
122 | if (skb) { | |
57b1d3ba TT |
123 | struct svc_sock *svsk = |
124 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 125 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
126 | |
127 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 128 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 129 | } |
1da177e4 LT |
130 | } |
131 | ||
b92503b2 CL |
132 | union svc_pktinfo_u { |
133 | struct in_pktinfo pkti; | |
b92503b2 | 134 | struct in6_pktinfo pkti6; |
b92503b2 | 135 | }; |
bc375ea7 DM |
136 | #define SVC_PKTINFO_SPACE \ |
137 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
138 | |
139 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
140 | { | |
57b1d3ba TT |
141 | struct svc_sock *svsk = |
142 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
143 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
144 | case AF_INET: { |
145 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
146 | ||
147 | cmh->cmsg_level = SOL_IP; | |
148 | cmh->cmsg_type = IP_PKTINFO; | |
149 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
150 | pki->ipi_spec_dst.s_addr = |
151 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
152 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
153 | } | |
154 | break; | |
5a05ed73 | 155 | |
b92503b2 CL |
156 | case AF_INET6: { |
157 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 158 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
159 | |
160 | cmh->cmsg_level = SOL_IPV6; | |
161 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 | 162 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
4e3fd7a0 | 163 | pki->ipi6_addr = daddr->sin6_addr; |
b92503b2 CL |
164 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
165 | } | |
166 | break; | |
b92503b2 | 167 | } |
b92503b2 CL |
168 | } |
169 | ||
1da177e4 | 170 | /* |
4cfc7e60 | 171 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 172 | */ |
4cfc7e60 RI |
173 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
174 | struct page *headpage, unsigned long headoffset, | |
175 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 176 | { |
1da177e4 LT |
177 | int result; |
178 | int size; | |
179 | struct page **ppage = xdr->pages; | |
180 | size_t base = xdr->page_base; | |
181 | unsigned int pglen = xdr->page_len; | |
226453d8 | 182 | unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; |
4cfc7e60 RI |
183 | int slen; |
184 | int len = 0; | |
1da177e4 LT |
185 | |
186 | slen = xdr->len; | |
187 | ||
1da177e4 LT |
188 | /* send head */ |
189 | if (slen == xdr->head[0].iov_len) | |
190 | flags = 0; | |
4cfc7e60 | 191 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 192 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
193 | if (len != xdr->head[0].iov_len) |
194 | goto out; | |
195 | slen -= xdr->head[0].iov_len; | |
196 | if (slen == 0) | |
197 | goto out; | |
198 | ||
199 | /* send page data */ | |
200 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
201 | while (pglen > 0) { | |
202 | if (slen == size) | |
203 | flags = 0; | |
e6242e92 | 204 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
205 | if (result > 0) |
206 | len += result; | |
207 | if (result != size) | |
208 | goto out; | |
209 | slen -= size; | |
210 | pglen -= size; | |
211 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
212 | base = 0; | |
213 | ppage++; | |
214 | } | |
4cfc7e60 | 215 | |
1da177e4 LT |
216 | /* send tail */ |
217 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
218 | result = kernel_sendpage(sock, tailpage, tailoffset, |
219 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
220 | if (result > 0) |
221 | len += result; | |
222 | } | |
4cfc7e60 RI |
223 | |
224 | out: | |
225 | return len; | |
226 | } | |
227 | ||
228 | ||
229 | /* | |
230 | * Generic sendto routine | |
231 | */ | |
232 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
233 | { | |
234 | struct svc_sock *svsk = | |
235 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
236 | struct socket *sock = svsk->sk_sock; | |
237 | union { | |
238 | struct cmsghdr hdr; | |
239 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
240 | } buffer; | |
241 | struct cmsghdr *cmh = &buffer.hdr; | |
242 | int len = 0; | |
243 | unsigned long tailoff; | |
244 | unsigned long headoff; | |
245 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
246 | ||
247 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
248 | struct msghdr msg = { | |
249 | .msg_name = &rqstp->rq_addr, | |
250 | .msg_namelen = rqstp->rq_addrlen, | |
251 | .msg_control = cmh, | |
252 | .msg_controllen = sizeof(buffer), | |
253 | .msg_flags = MSG_MORE, | |
254 | }; | |
255 | ||
256 | svc_set_cmsg_data(rqstp, cmh); | |
257 | ||
d8725c86 | 258 | if (sock_sendmsg(sock, &msg) < 0) |
4cfc7e60 RI |
259 | goto out; |
260 | } | |
261 | ||
262 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
263 | headoff = 0; | |
264 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
265 | rqstp->rq_respages[0], tailoff); | |
266 | ||
1da177e4 | 267 | out: |
ad06e4bd | 268 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 269 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 270 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
271 | |
272 | return len; | |
273 | } | |
274 | ||
80212d59 N |
275 | /* |
276 | * Report socket names for nfsdfs | |
277 | */ | |
e7942b9f | 278 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 279 | { |
017cb47f CL |
280 | const struct sock *sk = svsk->sk_sk; |
281 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
282 | "udp" : "tcp"; | |
80212d59 N |
283 | int len; |
284 | ||
017cb47f | 285 | switch (sk->sk_family) { |
e7942b9f CL |
286 | case PF_INET: |
287 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 288 | proto_name, |
c720c7e8 ED |
289 | &inet_sk(sk)->inet_rcv_saddr, |
290 | inet_sk(sk)->inet_num); | |
80212d59 | 291 | break; |
c2bb06db | 292 | #if IS_ENABLED(CONFIG_IPV6) |
58de2f86 CL |
293 | case PF_INET6: |
294 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f | 295 | proto_name, |
efe4208f | 296 | &sk->sk_v6_rcv_saddr, |
c720c7e8 | 297 | inet_sk(sk)->inet_num); |
80212d59 | 298 | break; |
c2bb06db | 299 | #endif |
80212d59 | 300 | default: |
e7942b9f | 301 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 302 | sk->sk_family); |
80212d59 | 303 | } |
e7942b9f CL |
304 | |
305 | if (len >= remaining) { | |
306 | *buf = '\0'; | |
307 | return -ENAMETOOLONG; | |
80212d59 N |
308 | } |
309 | return len; | |
310 | } | |
311 | ||
1da177e4 LT |
312 | /* |
313 | * Generic recvfrom routine. | |
314 | */ | |
0f0257ea TT |
315 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
316 | int buflen) | |
1da177e4 | 317 | { |
57b1d3ba TT |
318 | struct svc_sock *svsk = |
319 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
320 | struct msghdr msg = { |
321 | .msg_flags = MSG_DONTWAIT, | |
322 | }; | |
323 | int len; | |
1da177e4 | 324 | |
260c1d12 TT |
325 | rqstp->rq_xprt_hlen = 0; |
326 | ||
f8d1ff47 | 327 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1ba95105 CL |
328 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
329 | msg.msg_flags); | |
f8d1ff47 TM |
330 | /* If we read a full record, then assume there may be more |
331 | * data to read (stream based sockets only!) | |
332 | */ | |
333 | if (len == buflen) | |
334 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1da177e4 | 335 | |
1da177e4 | 336 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 337 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
338 | return len; |
339 | } | |
340 | ||
31d68ef6 BF |
341 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
342 | struct kvec *iov, int nr, | |
343 | int buflen, unsigned int base) | |
344 | { | |
345 | size_t save_iovlen; | |
09acfea5 | 346 | void *save_iovbase; |
31d68ef6 BF |
347 | unsigned int i; |
348 | int ret; | |
349 | ||
350 | if (base == 0) | |
351 | return svc_recvfrom(rqstp, iov, nr, buflen); | |
352 | ||
353 | for (i = 0; i < nr; i++) { | |
354 | if (iov[i].iov_len > base) | |
355 | break; | |
356 | base -= iov[i].iov_len; | |
357 | } | |
358 | save_iovlen = iov[i].iov_len; | |
359 | save_iovbase = iov[i].iov_base; | |
360 | iov[i].iov_len -= base; | |
361 | iov[i].iov_base += base; | |
362 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); | |
363 | iov[i].iov_len = save_iovlen; | |
364 | iov[i].iov_base = save_iovbase; | |
365 | return ret; | |
366 | } | |
367 | ||
1da177e4 LT |
368 | /* |
369 | * Set socket snd and rcv buffer lengths | |
370 | */ | |
0f0257ea TT |
371 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
372 | unsigned int rcv) | |
1da177e4 LT |
373 | { |
374 | #if 0 | |
375 | mm_segment_t oldfs; | |
376 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
377 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
378 | (char*)&snd, sizeof(snd)); | |
379 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
380 | (char*)&rcv, sizeof(rcv)); | |
381 | #else | |
382 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
383 | * which isn't acceptable. Until that is made conditional | |
384 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
385 | * DaveM said I could! | |
386 | */ | |
387 | lock_sock(sock->sk); | |
388 | sock->sk->sk_sndbuf = snd * 2; | |
389 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 390 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
391 | release_sock(sock->sk); |
392 | #endif | |
393 | } | |
16e4d93f CL |
394 | |
395 | static int svc_sock_secure_port(struct svc_rqst *rqstp) | |
396 | { | |
397 | return svc_port_is_privileged(svc_addr(rqstp)); | |
398 | } | |
399 | ||
1da177e4 LT |
400 | /* |
401 | * INET callback when data has been received on the socket. | |
402 | */ | |
fa9251af | 403 | static void svc_data_ready(struct sock *sk) |
1da177e4 | 404 | { |
939bb7ef | 405 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 406 | |
939bb7ef | 407 | if (svsk) { |
676d2369 DM |
408 | dprintk("svc: socket %p(inet %p), busy=%d\n", |
409 | svsk, sk, | |
02fc6c36 | 410 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
fa9251af | 411 | svsk->sk_odata(sk); |
4720b070 TM |
412 | if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) |
413 | svc_xprt_enqueue(&svsk->sk_xprt); | |
939bb7ef | 414 | } |
1da177e4 LT |
415 | } |
416 | ||
417 | /* | |
418 | * INET callback when space is newly available on the socket. | |
419 | */ | |
0f0257ea | 420 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
421 | { |
422 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
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)); |
fa9251af | 427 | svsk->sk_owspace(sk); |
f6150c3c | 428 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 429 | } |
1da177e4 LT |
430 | } |
431 | ||
c7fb3f06 TM |
432 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
433 | { | |
637600f3 | 434 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
c7fb3f06 TM |
435 | |
436 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
437 | return 1; | |
637600f3 | 438 | return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
51877680 TM |
439 | } |
440 | ||
7702ce40 CL |
441 | /* |
442 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
443 | */ | |
444 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
445 | struct cmsghdr *cmh) | |
446 | { | |
447 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
448 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
449 | ||
7702ce40 CL |
450 | if (cmh->cmsg_type != IP_PKTINFO) |
451 | return 0; | |
849a1cf1 MJ |
452 | |
453 | daddr->sin_family = AF_INET; | |
454 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
455 | return 1; |
456 | } | |
457 | ||
458 | /* | |
73df66f8 | 459 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
7702ce40 CL |
460 | */ |
461 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
462 | struct cmsghdr *cmh) | |
463 | { | |
464 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
465 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
466 | ||
7702ce40 CL |
467 | if (cmh->cmsg_type != IPV6_PKTINFO) |
468 | return 0; | |
849a1cf1 MJ |
469 | |
470 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 471 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 472 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
473 | return 1; |
474 | } | |
475 | ||
9dbc240f TT |
476 | /* |
477 | * Copy the UDP datagram's destination address to the rqstp structure. | |
478 | * The 'destination' address in this case is the address to which the | |
479 | * peer sent the datagram, i.e. our local address. For multihomed | |
480 | * hosts, this can change from msg to msg. Note that only the IP | |
481 | * address changes, the port number should remain the same. | |
482 | */ | |
7702ce40 CL |
483 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
484 | struct cmsghdr *cmh) | |
95756482 | 485 | { |
7702ce40 CL |
486 | switch (cmh->cmsg_level) { |
487 | case SOL_IP: | |
488 | return svc_udp_get_dest_address4(rqstp, cmh); | |
489 | case SOL_IPV6: | |
490 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 491 | } |
7702ce40 CL |
492 | |
493 | return 0; | |
95756482 CL |
494 | } |
495 | ||
1da177e4 LT |
496 | /* |
497 | * Receive a datagram from a UDP socket. | |
498 | */ | |
0f0257ea | 499 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 500 | { |
57b1d3ba TT |
501 | struct svc_sock *svsk = |
502 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 503 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 504 | struct sk_buff *skb; |
bc375ea7 DM |
505 | union { |
506 | struct cmsghdr hdr; | |
507 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
508 | } buffer; | |
509 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
510 | struct msghdr msg = { |
511 | .msg_name = svc_addr(rqstp), | |
512 | .msg_control = cmh, | |
513 | .msg_controllen = sizeof(buffer), | |
514 | .msg_flags = MSG_DONTWAIT, | |
515 | }; | |
abc5c44d CL |
516 | size_t len; |
517 | int err; | |
1da177e4 | 518 | |
02fc6c36 | 519 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
520 | /* udp sockets need large rcvbuf as all pending |
521 | * requests are still in that buffer. sndbuf must | |
522 | * also be large enough that there is enough space | |
3262c816 GB |
523 | * for one reply per thread. We count all threads |
524 | * rather than threads in a particular pool, which | |
525 | * provides an upper bound on the number of threads | |
526 | * which will access the socket. | |
1da177e4 LT |
527 | */ |
528 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
529 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
530 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 531 | |
02fc6c36 | 532 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
533 | skb = NULL; |
534 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
535 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
536 | if (err >= 0) | |
537 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
538 | ||
539 | if (skb == NULL) { | |
540 | if (err != -EAGAIN) { | |
541 | /* possibly an icmp error */ | |
542 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 543 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 544 | } |
9f9d2ebe | 545 | return 0; |
1da177e4 | 546 | } |
9dbc240f | 547 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 548 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
549 | if (skb->tstamp.tv64 == 0) { |
550 | skb->tstamp = ktime_get_real(); | |
cca5172a | 551 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
552 | need that much accuracy */ |
553 | } | |
b7aa0bf7 | 554 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 555 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 556 | |
1da8c681 | 557 | len = skb->len; |
1da177e4 LT |
558 | rqstp->rq_arg.len = len; |
559 | ||
95756482 | 560 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 561 | |
7702ce40 | 562 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
563 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
564 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 565 | goto out_free; |
7a37f578 | 566 | } |
849a1cf1 | 567 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
568 | |
569 | if (skb_is_nonlinear(skb)) { | |
570 | /* we have to copy */ | |
571 | local_bh_disable(); | |
572 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
573 | local_bh_enable(); | |
574 | /* checksum error */ | |
22911fc5 | 575 | goto out_free; |
1da177e4 LT |
576 | } |
577 | local_bh_enable(); | |
9d410c79 | 578 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
579 | } else { |
580 | /* we can use it in-place */ | |
1da8c681 | 581 | rqstp->rq_arg.head[0].iov_base = skb->data; |
1da177e4 | 582 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
583 | if (skb_checksum_complete(skb)) |
584 | goto out_free; | |
5148bf4e | 585 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
586 | } |
587 | ||
588 | rqstp->rq_arg.page_base = 0; | |
589 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
590 | rqstp->rq_arg.head[0].iov_len = len; | |
591 | rqstp->rq_arg.page_len = 0; | |
44524359 | 592 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
593 | } else { |
594 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 595 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 596 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 | 597 | } |
afc59400 | 598 | rqstp->rq_next_page = rqstp->rq_respages+1; |
1da177e4 LT |
599 | |
600 | if (serv->sv_stats) | |
601 | serv->sv_stats->netudpcnt++; | |
602 | ||
603 | return len; | |
f23abfdb BF |
604 | out_free: |
605 | trace_kfree_skb(skb, svc_udp_recvfrom); | |
606 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
607 | return 0; | |
1da177e4 LT |
608 | } |
609 | ||
610 | static int | |
611 | svc_udp_sendto(struct svc_rqst *rqstp) | |
612 | { | |
613 | int error; | |
614 | ||
615 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
616 | if (error == -ECONNREFUSED) | |
617 | /* ICMP error on earlier request. */ | |
618 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
619 | ||
620 | return error; | |
621 | } | |
622 | ||
e831fe65 TT |
623 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
624 | { | |
625 | } | |
626 | ||
323bee32 TT |
627 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
628 | { | |
629 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 630 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
631 | unsigned long required; |
632 | ||
633 | /* | |
634 | * Set the SOCK_NOSPACE flag before checking the available | |
635 | * sock space. | |
636 | */ | |
637 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 638 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
639 | if (required*2 > sock_wspace(svsk->sk_sk)) |
640 | return 0; | |
641 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
642 | return 1; | |
643 | } | |
644 | ||
38a417cc TT |
645 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
646 | { | |
647 | BUG(); | |
648 | return NULL; | |
649 | } | |
650 | ||
b700cbb1 | 651 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 652 | struct net *net, |
b700cbb1 TT |
653 | struct sockaddr *sa, int salen, |
654 | int flags) | |
655 | { | |
62832c03 | 656 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
657 | } |
658 | ||
360d8738 | 659 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 660 | .xpo_create = svc_udp_create, |
5d137990 TT |
661 | .xpo_recvfrom = svc_udp_recvfrom, |
662 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 663 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
664 | .xpo_detach = svc_sock_detach, |
665 | .xpo_free = svc_sock_free, | |
e831fe65 | 666 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 667 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 668 | .xpo_accept = svc_udp_accept, |
16e4d93f | 669 | .xpo_secure_port = svc_sock_secure_port, |
360d8738 TT |
670 | }; |
671 | ||
672 | static struct svc_xprt_class svc_udp_class = { | |
673 | .xcl_name = "udp", | |
b700cbb1 | 674 | .xcl_owner = THIS_MODULE, |
360d8738 | 675 | .xcl_ops = &svc_udp_ops, |
49023155 | 676 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
3c45ddf8 | 677 | .xcl_ident = XPRT_TRANSPORT_UDP, |
360d8738 TT |
678 | }; |
679 | ||
bb5cf160 | 680 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 681 | { |
7702ce40 | 682 | int err, level, optname, one = 1; |
7a37f578 | 683 | |
bd4620dd SK |
684 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
685 | &svsk->sk_xprt, serv); | |
def13d74 | 686 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
fa9251af | 687 | svsk->sk_sk->sk_data_ready = svc_data_ready; |
1da177e4 | 688 | svsk->sk_sk->sk_write_space = svc_write_space; |
1da177e4 LT |
689 | |
690 | /* initialise setting must have enough space to | |
cca5172a | 691 | * receive and respond to one request. |
1da177e4 LT |
692 | * svc_udp_recvfrom will re-adjust if necessary |
693 | */ | |
694 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
695 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
696 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 697 | |
0f0257ea TT |
698 | /* data might have come in before data_ready set up */ |
699 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 700 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 701 | |
7a37f578 | 702 | /* make sure we get destination address info */ |
7702ce40 CL |
703 | switch (svsk->sk_sk->sk_family) { |
704 | case AF_INET: | |
705 | level = SOL_IP; | |
706 | optname = IP_PKTINFO; | |
707 | break; | |
708 | case AF_INET6: | |
709 | level = SOL_IPV6; | |
710 | optname = IPV6_RECVPKTINFO; | |
711 | break; | |
712 | default: | |
713 | BUG(); | |
714 | } | |
715 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
716 | (char *)&one, sizeof(one)); | |
717 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
718 | } |
719 | ||
720 | /* | |
721 | * A data_ready event on a listening socket means there's a connection | |
722 | * pending. Do not use state_change as a substitute for it. | |
723 | */ | |
676d2369 | 724 | static void svc_tcp_listen_data_ready(struct sock *sk) |
1da177e4 | 725 | { |
939bb7ef | 726 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
727 | |
728 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 729 | sk, sk->sk_state); |
1da177e4 | 730 | |
fa9251af TM |
731 | if (svsk) |
732 | svsk->sk_odata(sk); | |
939bb7ef NB |
733 | /* |
734 | * This callback may called twice when a new connection | |
735 | * is established as a child socket inherits everything | |
736 | * from a parent LISTEN socket. | |
737 | * 1) data_ready method of the parent socket will be called | |
738 | * when one of child sockets become ESTABLISHED. | |
739 | * 2) data_ready method of the child socket may be called | |
740 | * when it receives data before the socket is accepted. | |
741 | * In case of 2, we should ignore it silently. | |
742 | */ | |
743 | if (sk->sk_state == TCP_LISTEN) { | |
744 | if (svsk) { | |
02fc6c36 | 745 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 746 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
747 | } else |
748 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 749 | } |
1da177e4 LT |
750 | } |
751 | ||
752 | /* | |
753 | * A state change on a connected socket means it's dying or dead. | |
754 | */ | |
0f0257ea | 755 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 756 | { |
939bb7ef | 757 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
758 | |
759 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 760 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 761 | |
939bb7ef | 762 | if (!svsk) |
1da177e4 | 763 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 764 | else { |
fa9251af | 765 | svsk->sk_ostate(sk); |
b2f21f7d TM |
766 | if (sk->sk_state != TCP_ESTABLISHED) { |
767 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
768 | svc_xprt_enqueue(&svsk->sk_xprt); | |
769 | } | |
1da177e4 | 770 | } |
1da177e4 LT |
771 | } |
772 | ||
773 | /* | |
774 | * Accept a TCP connection | |
775 | */ | |
38a417cc | 776 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 777 | { |
38a417cc | 778 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 779 | struct sockaddr_storage addr; |
780 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 781 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
782 | struct socket *sock = svsk->sk_sock; |
783 | struct socket *newsock; | |
1da177e4 LT |
784 | struct svc_sock *newsvsk; |
785 | int err, slen; | |
5216a8e7 | 786 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
787 | |
788 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
789 | if (!sock) | |
38a417cc | 790 | return NULL; |
1da177e4 | 791 | |
02fc6c36 | 792 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
793 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
794 | if (err < 0) { | |
1da177e4 LT |
795 | if (err == -ENOMEM) |
796 | printk(KERN_WARNING "%s: no more sockets!\n", | |
797 | serv->sv_name); | |
e87cc472 JP |
798 | else if (err != -EAGAIN) |
799 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
800 | serv->sv_name, -err); | |
38a417cc | 801 | return NULL; |
1da177e4 | 802 | } |
02fc6c36 | 803 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 804 | |
cdd88b9f | 805 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 | 806 | if (err < 0) { |
e87cc472 JP |
807 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
808 | serv->sv_name, -err); | |
1da177e4 LT |
809 | goto failed; /* aborted connection or whatever */ |
810 | } | |
811 | ||
812 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
813 | * hosts here, but when we get encryption, the IP of the host won't |
814 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 815 | */ |
cdd88b9f | 816 | if (!svc_port_is_privileged(sin)) { |
a48fd0f9 | 817 | dprintk("%s: connect from unprivileged port: %s\n", |
cca5172a | 818 | serv->sv_name, |
cdd88b9f | 819 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 820 | } |
ad06e4bd | 821 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 822 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 823 | |
fa9251af TM |
824 | /* Reset the inherited callbacks before calling svc_setup_socket */ |
825 | newsock->sk->sk_state_change = svsk->sk_ostate; | |
826 | newsock->sk->sk_data_ready = svsk->sk_odata; | |
827 | newsock->sk->sk_write_space = svsk->sk_owspace; | |
828 | ||
1da177e4 LT |
829 | /* make sure that a write doesn't block forever when |
830 | * low on memory | |
831 | */ | |
832 | newsock->sk->sk_sndtimeo = HZ*30; | |
833 | ||
72c35376 BF |
834 | newsvsk = svc_setup_socket(serv, newsock, |
835 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
836 | if (IS_ERR(newsvsk)) | |
1da177e4 | 837 | goto failed; |
9dbc240f | 838 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
839 | err = kernel_getsockname(newsock, sin, &slen); |
840 | if (unlikely(err < 0)) { | |
841 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
842 | slen = offsetof(struct sockaddr, sa_data); | |
843 | } | |
9dbc240f | 844 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 845 | |
ef11ce24 N |
846 | if (sock_is_loopback(newsock->sk)) |
847 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
848 | else | |
849 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
f9f3cc4f TT |
850 | if (serv->sv_stats) |
851 | serv->sv_stats->nettcpconn++; | |
852 | ||
853 | return &newsvsk->sk_xprt; | |
854 | ||
855 | failed: | |
856 | sock_release(newsock); | |
857 | return NULL; | |
858 | } | |
859 | ||
31d68ef6 BF |
860 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
861 | { | |
862 | unsigned int i, len, npages; | |
863 | ||
8af345f5 | 864 | if (svsk->sk_datalen == 0) |
31d68ef6 | 865 | return 0; |
8af345f5 | 866 | len = svsk->sk_datalen; |
31d68ef6 BF |
867 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
868 | for (i = 0; i < npages; i++) { | |
869 | if (rqstp->rq_pages[i] != NULL) | |
870 | put_page(rqstp->rq_pages[i]); | |
871 | BUG_ON(svsk->sk_pages[i] == NULL); | |
872 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
873 | svsk->sk_pages[i] = NULL; | |
874 | } | |
875 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
876 | return len; | |
877 | } | |
878 | ||
879 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
880 | { | |
881 | unsigned int i, len, npages; | |
882 | ||
8af345f5 | 883 | if (svsk->sk_datalen == 0) |
31d68ef6 | 884 | return; |
8af345f5 | 885 | len = svsk->sk_datalen; |
31d68ef6 BF |
886 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
887 | for (i = 0; i < npages; i++) { | |
888 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
889 | rqstp->rq_pages[i] = NULL; | |
890 | } | |
891 | } | |
892 | ||
893 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
894 | { | |
895 | unsigned int i, len, npages; | |
896 | ||
8af345f5 | 897 | if (svsk->sk_datalen == 0) |
31d68ef6 | 898 | goto out; |
8af345f5 | 899 | len = svsk->sk_datalen; |
31d68ef6 BF |
900 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
901 | for (i = 0; i < npages; i++) { | |
cf3aa02c BF |
902 | if (svsk->sk_pages[i] == NULL) { |
903 | WARN_ON_ONCE(1); | |
904 | continue; | |
905 | } | |
31d68ef6 BF |
906 | put_page(svsk->sk_pages[i]); |
907 | svsk->sk_pages[i] = NULL; | |
908 | } | |
909 | out: | |
910 | svsk->sk_tcplen = 0; | |
8af345f5 | 911 | svsk->sk_datalen = 0; |
31d68ef6 BF |
912 | } |
913 | ||
1da177e4 | 914 | /* |
ad46ccf0 | 915 | * Receive fragment record header. |
8f55f3c0 | 916 | * If we haven't gotten the record length yet, get the next four bytes. |
1da177e4 | 917 | */ |
8f55f3c0 | 918 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 919 | { |
bb5cf160 | 920 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 921 | unsigned int want; |
8f55f3c0 | 922 | int len; |
1da177e4 | 923 | |
c0401ea0 | 924 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
925 | struct kvec iov; |
926 | ||
5ee78d48 | 927 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
928 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
929 | iov.iov_len = want; | |
930 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
931 | goto error; | |
932 | svsk->sk_tcplen += len; | |
933 | ||
934 | if (len < want) { | |
c0401ea0 CL |
935 | dprintk("svc: short recvfrom while reading record " |
936 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 937 | return -EAGAIN; |
1da177e4 LT |
938 | } |
939 | ||
cc248d4b | 940 | dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
836fbadb BF |
941 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
942 | serv->sv_max_mesg) { | |
3a28e331 BF |
943 | net_notice_ratelimited("RPC: fragment too large: %d\n", |
944 | svc_sock_reclen(svsk)); | |
1da177e4 LT |
945 | goto err_delete; |
946 | } | |
947 | } | |
948 | ||
cc248d4b | 949 | return svc_sock_reclen(svsk); |
31d68ef6 BF |
950 | error: |
951 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 952 | return len; |
31d68ef6 | 953 | err_delete: |
8f55f3c0 | 954 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
955 | return -EAGAIN; |
956 | } | |
957 | ||
586c52cc | 958 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 959 | { |
586c52cc | 960 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 961 | struct rpc_rqst *req = NULL; |
586c52cc TM |
962 | struct kvec *src, *dst; |
963 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
964 | __be32 xid; |
965 | __be32 calldir; | |
4cfc7e60 | 966 | |
4cfc7e60 RI |
967 | xid = *p++; |
968 | calldir = *p; | |
969 | ||
093a1468 | 970 | if (!bc_xprt) |
586c52cc | 971 | return -EAGAIN; |
093a1468 TM |
972 | spin_lock_bh(&bc_xprt->transport_lock); |
973 | req = xprt_lookup_rqst(bc_xprt, xid); | |
974 | if (!req) | |
975 | goto unlock_notfound; | |
586c52cc TM |
976 | |
977 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
978 | /* | |
979 | * XXX!: cheating for now! Only copying HEAD. | |
980 | * But we know this is good enough for now (in fact, for any | |
981 | * callback reply in the forseeable future). | |
982 | */ | |
983 | dst = &req->rq_private_buf.head[0]; | |
984 | src = &rqstp->rq_arg.head[0]; | |
985 | if (dst->iov_len < src->iov_len) | |
093a1468 | 986 | goto unlock_eagain; /* whatever; just giving up. */ |
586c52cc | 987 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
cc248d4b | 988 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
586c52cc | 989 | rqstp->rq_arg.len = 0; |
093a1468 | 990 | spin_unlock_bh(&bc_xprt->transport_lock); |
586c52cc | 991 | return 0; |
093a1468 TM |
992 | unlock_notfound: |
993 | printk(KERN_NOTICE | |
994 | "%s: Got unrecognized reply: " | |
995 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
996 | __func__, ntohl(calldir), | |
997 | bc_xprt, ntohl(xid)); | |
998 | unlock_eagain: | |
999 | spin_unlock_bh(&bc_xprt->transport_lock); | |
1000 | return -EAGAIN; | |
586c52cc TM |
1001 | } |
1002 | ||
1003 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1004 | { | |
1005 | int i = 0; | |
1006 | int t = 0; | |
1007 | ||
1008 | while (t < len) { | |
1009 | vec[i].iov_base = page_address(pages[i]); | |
1010 | vec[i].iov_len = PAGE_SIZE; | |
1011 | i++; | |
1012 | t += PAGE_SIZE; | |
1013 | } | |
1014 | return i; | |
4cfc7e60 RI |
1015 | } |
1016 | ||
836fbadb BF |
1017 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
1018 | { | |
1019 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
836fbadb BF |
1020 | dprintk("svc: TCP %s record (%d bytes)\n", |
1021 | svc_sock_final_rec(svsk) ? "final" : "nonfinal", | |
1022 | svc_sock_reclen(svsk)); | |
1023 | svsk->sk_tcplen = 0; | |
1024 | svsk->sk_reclen = 0; | |
1025 | } | |
31d68ef6 | 1026 | |
8f55f3c0 AB |
1027 | /* |
1028 | * Receive data from a TCP socket. | |
1029 | */ | |
1030 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1031 | { | |
1032 | struct svc_sock *svsk = | |
1033 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1034 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1035 | int len; | |
1036 | struct kvec *vec; | |
31d68ef6 | 1037 | unsigned int want, base; |
586c52cc TM |
1038 | __be32 *p; |
1039 | __be32 calldir; | |
5ee78d48 | 1040 | int pnum; |
8f55f3c0 AB |
1041 | |
1042 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1043 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1044 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1045 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1046 | ||
1047 | len = svc_tcp_recv_record(svsk, rqstp); | |
1048 | if (len < 0) | |
1049 | goto error; | |
1050 | ||
31d68ef6 | 1051 | base = svc_tcp_restore_pages(svsk, rqstp); |
836fbadb | 1052 | want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
31d68ef6 | 1053 | |
3cc03b16 | 1054 | vec = rqstp->rq_vec; |
4cfc7e60 | 1055 | |
586c52cc | 1056 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
836fbadb | 1057 | svsk->sk_datalen + want); |
586c52cc | 1058 | |
44524359 | 1059 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
afc59400 | 1060 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
1da177e4 LT |
1061 | |
1062 | /* Now receive data */ | |
31d68ef6 | 1063 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
8af345f5 | 1064 | if (len >= 0) { |
31d68ef6 | 1065 | svsk->sk_tcplen += len; |
8af345f5 BF |
1066 | svsk->sk_datalen += len; |
1067 | } | |
836fbadb | 1068 | if (len != want || !svc_sock_final_rec(svsk)) { |
be1e4444 | 1069 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 | 1070 | if (len < 0 && len != -EAGAIN) |
ad46ccf0 | 1071 | goto err_delete; |
836fbadb BF |
1072 | if (len == want) |
1073 | svc_tcp_fragment_received(svsk); | |
1074 | else | |
3a28e331 BF |
1075 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1076 | (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), | |
836fbadb | 1077 | svc_sock_reclen(svsk)); |
31d68ef6 BF |
1078 | goto err_noclose; |
1079 | } | |
1da177e4 | 1080 | |
1f691b07 | 1081 | if (svsk->sk_datalen < 8) { |
cf3aa02c | 1082 | svsk->sk_datalen = 0; |
ad46ccf0 | 1083 | goto err_delete; /* client is nuts. */ |
cf3aa02c | 1084 | } |
ad46ccf0 | 1085 | |
836fbadb | 1086 | rqstp->rq_arg.len = svsk->sk_datalen; |
1da177e4 | 1087 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1088 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1089 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1090 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1091 | } else |
1092 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1093 | |
5148bf4e | 1094 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 | 1095 | rqstp->rq_prot = IPPROTO_TCP; |
7501cc2b JL |
1096 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
1097 | set_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1098 | else | |
1099 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1da177e4 | 1100 | |
586c52cc TM |
1101 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1102 | calldir = p[1]; | |
8985ef0b | 1103 | if (calldir) |
586c52cc | 1104 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1105 | |
1da177e4 | 1106 | /* Reset TCP read info */ |
8af345f5 | 1107 | svsk->sk_datalen = 0; |
836fbadb | 1108 | svc_tcp_fragment_received(svsk); |
0601f793 | 1109 | |
8985ef0b BF |
1110 | if (len < 0) |
1111 | goto error; | |
1da177e4 | 1112 | |
9dbc240f | 1113 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1114 | if (serv->sv_stats) |
1115 | serv->sv_stats->nettcpcnt++; | |
1116 | ||
5ee78d48 | 1117 | return rqstp->rq_arg.len; |
1da177e4 | 1118 | |
8f55f3c0 | 1119 | error: |
31d68ef6 | 1120 | if (len != -EAGAIN) |
ad46ccf0 | 1121 | goto err_delete; |
31d68ef6 | 1122 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
9f9d2ebe | 1123 | return 0; |
ad46ccf0 | 1124 | err_delete: |
31d68ef6 BF |
1125 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
1126 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1127 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1128 | err_noclose: | |
9f9d2ebe | 1129 | return 0; /* record not complete */ |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | /* | |
1133 | * Send out data on TCP socket. | |
1134 | */ | |
0f0257ea | 1135 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1136 | { |
1137 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1138 | int sent; | |
d8ed029d | 1139 | __be32 reclen; |
1da177e4 LT |
1140 | |
1141 | /* Set up the first element of the reply kvec. | |
1142 | * Any other kvecs that may be in use have been taken | |
1143 | * care of by the server implementation itself. | |
1144 | */ | |
1145 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1146 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1147 | ||
1da177e4 LT |
1148 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1149 | if (sent != xbufp->len) { | |
0f0257ea TT |
1150 | printk(KERN_NOTICE |
1151 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1152 | "- shutting down socket\n", | |
57b1d3ba | 1153 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1154 | (sent<0)?"got error":"sent only", |
1155 | sent, xbufp->len); | |
57b1d3ba | 1156 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1157 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1158 | sent = -EAGAIN; |
1159 | } | |
1160 | return sent; | |
1161 | } | |
1162 | ||
e831fe65 TT |
1163 | /* |
1164 | * Setup response header. TCP has a 4B record length field. | |
1165 | */ | |
1166 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1167 | { | |
1168 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1169 | ||
1170 | /* tcp needs a space for the record length... */ | |
1171 | svc_putnl(resv, 0); | |
1172 | } | |
1173 | ||
b700cbb1 | 1174 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1175 | struct net *net, |
b700cbb1 TT |
1176 | struct sockaddr *sa, int salen, |
1177 | int flags) | |
1178 | { | |
62832c03 | 1179 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1180 | } |
1181 | ||
9e00abc3 | 1182 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1183 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1184 | struct net *, struct sockaddr *, | |
1185 | int, int); | |
1186 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1187 | ||
1188 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1189 | struct net *net, | |
1190 | struct sockaddr *sa, int salen, | |
1191 | int flags) | |
1192 | { | |
1193 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1194 | } | |
1195 | ||
1196 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1197 | { | |
1198 | } | |
1199 | ||
1200 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1201 | .xpo_create = svc_bc_tcp_create, | |
1202 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1203 | .xpo_free = svc_bc_sock_free, | |
1204 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
16e4d93f | 1205 | .xpo_secure_port = svc_sock_secure_port, |
1f11a034 AA |
1206 | }; |
1207 | ||
1208 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1209 | .xcl_name = "tcp-bc", | |
1210 | .xcl_owner = THIS_MODULE, | |
1211 | .xcl_ops = &svc_tcp_bc_ops, | |
1212 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1213 | }; | |
16b2d1e1 AA |
1214 | |
1215 | static void svc_init_bc_xprt_sock(void) | |
1216 | { | |
1217 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1218 | } | |
1219 | ||
1220 | static void svc_cleanup_bc_xprt_sock(void) | |
1221 | { | |
1222 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1223 | } | |
9e00abc3 | 1224 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1225 | static void svc_init_bc_xprt_sock(void) |
1226 | { | |
1227 | } | |
1228 | ||
1229 | static void svc_cleanup_bc_xprt_sock(void) | |
1230 | { | |
1231 | } | |
9e00abc3 | 1232 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1233 | |
360d8738 | 1234 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1235 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1236 | .xpo_recvfrom = svc_tcp_recvfrom, |
1237 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1238 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1239 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1240 | .xpo_free = svc_sock_free, |
e831fe65 | 1241 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1242 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1243 | .xpo_accept = svc_tcp_accept, |
16e4d93f | 1244 | .xpo_secure_port = svc_sock_secure_port, |
360d8738 TT |
1245 | }; |
1246 | ||
1247 | static struct svc_xprt_class svc_tcp_class = { | |
1248 | .xcl_name = "tcp", | |
b700cbb1 | 1249 | .xcl_owner = THIS_MODULE, |
360d8738 | 1250 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1251 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
3c45ddf8 | 1252 | .xcl_ident = XPRT_TRANSPORT_TCP, |
360d8738 TT |
1253 | }; |
1254 | ||
1255 | void svc_init_xprt_sock(void) | |
1256 | { | |
1257 | svc_reg_xprt_class(&svc_tcp_class); | |
1258 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1259 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1260 | } |
1261 | ||
1262 | void svc_cleanup_xprt_sock(void) | |
1263 | { | |
1264 | svc_unreg_xprt_class(&svc_tcp_class); | |
1265 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1266 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1267 | } |
1268 | ||
bb5cf160 | 1269 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1270 | { |
1271 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1272 | |
bd4620dd SK |
1273 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1274 | &svsk->sk_xprt, serv); | |
def13d74 | 1275 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1276 | if (sk->sk_state == TCP_LISTEN) { |
1277 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1278 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1279 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1280 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1281 | } else { |
1282 | dprintk("setting up TCP socket for reading\n"); | |
1283 | sk->sk_state_change = svc_tcp_state_change; | |
fa9251af | 1284 | sk->sk_data_ready = svc_data_ready; |
637600f3 | 1285 | sk->sk_write_space = svc_write_space; |
1da177e4 LT |
1286 | |
1287 | svsk->sk_reclen = 0; | |
1288 | svsk->sk_tcplen = 0; | |
8af345f5 | 1289 | svsk->sk_datalen = 0; |
31d68ef6 | 1290 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1291 | |
b7872fe8 | 1292 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1293 | |
02fc6c36 | 1294 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
b2f21f7d TM |
1295 | switch (sk->sk_state) { |
1296 | case TCP_SYN_RECV: | |
1297 | case TCP_ESTABLISHED: | |
1298 | break; | |
1299 | default: | |
02fc6c36 | 1300 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
b2f21f7d | 1301 | } |
1da177e4 LT |
1302 | } |
1303 | } | |
1304 | ||
0f0257ea | 1305 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1306 | { |
1307 | /* | |
1308 | * The number of server threads has changed. Update | |
1309 | * rcvbuf and sndbuf accordingly on all sockets | |
1310 | */ | |
8f3a6de3 | 1311 | struct svc_sock *svsk; |
1da177e4 LT |
1312 | |
1313 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1314 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1315 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1316 | spin_unlock_bh(&serv->sv_lock); |
1317 | } | |
24c3767e | 1318 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1319 | |
1da177e4 LT |
1320 | /* |
1321 | * Initialize socket for RPC use and create svc_sock struct | |
1da177e4 | 1322 | */ |
6b174337 CL |
1323 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1324 | struct socket *sock, | |
72c35376 | 1325 | int flags) |
1da177e4 LT |
1326 | { |
1327 | struct svc_sock *svsk; | |
1328 | struct sock *inet; | |
6b174337 | 1329 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1330 | int err = 0; |
1da177e4 LT |
1331 | |
1332 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1333 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1334 | if (!svsk) | |
1335 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1336 | |
1337 | inet = sock->sk; | |
1338 | ||
1339 | /* Register socket with portmapper */ | |
72c35376 BF |
1340 | if (pmap_register) |
1341 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1342 | inet->sk_protocol, |
c720c7e8 | 1343 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1344 | |
72c35376 | 1345 | if (err < 0) { |
1da177e4 | 1346 | kfree(svsk); |
72c35376 | 1347 | return ERR_PTR(err); |
1da177e4 LT |
1348 | } |
1349 | ||
1da177e4 LT |
1350 | inet->sk_user_data = svsk; |
1351 | svsk->sk_sock = sock; | |
1352 | svsk->sk_sk = inet; | |
1353 | svsk->sk_ostate = inet->sk_state_change; | |
1354 | svsk->sk_odata = inet->sk_data_ready; | |
1355 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1356 | |
1357 | /* Initialize the socket */ | |
1358 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1359 | svc_udp_init(svsk, serv); |
637600f3 | 1360 | else |
bb5cf160 | 1361 | svc_tcp_init(svsk, serv); |
1da177e4 | 1362 | |
c7995f8a TM |
1363 | dprintk("svc: svc_setup_socket created %p (inet %p), " |
1364 | "listen %d close %d\n", | |
1365 | svsk, svsk->sk_sk, | |
1366 | test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags), | |
1367 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1da177e4 | 1368 | |
1da177e4 LT |
1369 | return svsk; |
1370 | } | |
1371 | ||
30646394 SK |
1372 | bool svc_alien_sock(struct net *net, int fd) |
1373 | { | |
1374 | int err; | |
1375 | struct socket *sock = sockfd_lookup(fd, &err); | |
1376 | bool ret = false; | |
1377 | ||
1378 | if (!sock) | |
1379 | goto out; | |
1380 | if (sock_net(sock->sk) != net) | |
1381 | ret = true; | |
1382 | sockfd_put(sock); | |
1383 | out: | |
1384 | return ret; | |
1385 | } | |
1386 | EXPORT_SYMBOL_GPL(svc_alien_sock); | |
1387 | ||
bfba9ab4 CL |
1388 | /** |
1389 | * svc_addsock - add a listener socket to an RPC service | |
1390 | * @serv: pointer to RPC service to which to add a new listener | |
1391 | * @fd: file descriptor of the new listener | |
1392 | * @name_return: pointer to buffer to fill in with name of listener | |
1393 | * @len: size of the buffer | |
1394 | * | |
1395 | * Fills in socket name and returns positive length of name if successful. | |
1396 | * Name is terminated with '\n'. On error, returns a negative errno | |
1397 | * value. | |
1398 | */ | |
1399 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1400 | const size_t len) | |
b41b66d6 N |
1401 | { |
1402 | int err = 0; | |
1403 | struct socket *so = sockfd_lookup(fd, &err); | |
1404 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1405 | struct sockaddr_storage addr; |
1406 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1407 | int salen; | |
b41b66d6 N |
1408 | |
1409 | if (!so) | |
1410 | return err; | |
a8e10078 | 1411 | err = -EAFNOSUPPORT; |
205ba423 | 1412 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1413 | goto out; |
1414 | err = -EPROTONOSUPPORT; | |
1415 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1416 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1417 | goto out; |
1418 | err = -EISCONN; | |
1419 | if (so->state > SS_UNCONNECTED) | |
1420 | goto out; | |
1421 | err = -ENOENT; | |
1422 | if (!try_module_get(THIS_MODULE)) | |
1423 | goto out; | |
1424 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1425 | if (IS_ERR(svsk)) { | |
1426 | module_put(THIS_MODULE); | |
1427 | err = PTR_ERR(svsk); | |
1428 | goto out; | |
b41b66d6 | 1429 | } |
a8e10078 BF |
1430 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
1431 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
39b55301 | 1432 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1433 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1434 | out: |
1435 | sockfd_put(so); | |
1436 | return err; | |
b41b66d6 N |
1437 | } |
1438 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1439 | ||
1da177e4 LT |
1440 | /* |
1441 | * Create socket for RPC service. | |
1442 | */ | |
b700cbb1 TT |
1443 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1444 | int protocol, | |
62832c03 | 1445 | struct net *net, |
b700cbb1 TT |
1446 | struct sockaddr *sin, int len, |
1447 | int flags) | |
1da177e4 LT |
1448 | { |
1449 | struct svc_sock *svsk; | |
1450 | struct socket *sock; | |
1451 | int error; | |
1452 | int type; | |
9dbc240f TT |
1453 | struct sockaddr_storage addr; |
1454 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1455 | int newlen; | |
c69da774 TM |
1456 | int family; |
1457 | int val; | |
5216a8e7 | 1458 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1459 | |
ad06e4bd CL |
1460 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1461 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1462 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1463 | |
1464 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1465 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1466 | "sockets supported\n"); | |
b700cbb1 | 1467 | return ERR_PTR(-EINVAL); |
1da177e4 | 1468 | } |
c69da774 | 1469 | |
1da177e4 | 1470 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1471 | switch (sin->sa_family) { |
1472 | case AF_INET6: | |
1473 | family = PF_INET6; | |
1474 | break; | |
1475 | case AF_INET: | |
1476 | family = PF_INET; | |
1477 | break; | |
1478 | default: | |
1479 | return ERR_PTR(-EINVAL); | |
1480 | } | |
1da177e4 | 1481 | |
14ec63c3 | 1482 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1483 | if (error < 0) |
b700cbb1 | 1484 | return ERR_PTR(error); |
1da177e4 | 1485 | |
ed07536e PZ |
1486 | svc_reclassify_socket(sock); |
1487 | ||
c69da774 TM |
1488 | /* |
1489 | * If this is an PF_INET6 listener, we want to avoid | |
1490 | * getting requests from IPv4 remotes. Those should | |
1491 | * be shunted to a PF_INET listener via rpcbind. | |
1492 | */ | |
1493 | val = 1; | |
1494 | if (family == PF_INET6) | |
1495 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1496 | (char *)&val, sizeof(val)); | |
1497 | ||
18114746 | 1498 | if (type == SOCK_STREAM) |
4a17fd52 | 1499 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1500 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1501 | if (error < 0) |
1502 | goto bummer; | |
1da177e4 | 1503 | |
9dbc240f TT |
1504 | newlen = len; |
1505 | error = kernel_getsockname(sock, newsin, &newlen); | |
1506 | if (error < 0) | |
1507 | goto bummer; | |
1508 | ||
1da177e4 | 1509 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1510 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1511 | goto bummer; |
1512 | } | |
1513 | ||
72c35376 | 1514 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1515 | if (IS_ERR(svsk)) { |
1516 | error = PTR_ERR(svsk); | |
1517 | goto bummer; | |
e79eff1f | 1518 | } |
a8e10078 BF |
1519 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1520 | return (struct svc_xprt *)svsk; | |
1da177e4 LT |
1521 | bummer: |
1522 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1523 | sock_release(sock); | |
b700cbb1 | 1524 | return ERR_PTR(error); |
1da177e4 LT |
1525 | } |
1526 | ||
755cceab TT |
1527 | /* |
1528 | * Detach the svc_sock from the socket so that no | |
1529 | * more callbacks occur. | |
1530 | */ | |
1531 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1532 | { | |
1533 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1534 | struct sock *sk = svsk->sk_sk; | |
1535 | ||
1536 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1537 | ||
1538 | /* put back the old socket callbacks */ | |
069c225b | 1539 | lock_sock(sk); |
755cceab TT |
1540 | sk->sk_state_change = svsk->sk_ostate; |
1541 | sk->sk_data_ready = svsk->sk_odata; | |
1542 | sk->sk_write_space = svsk->sk_owspace; | |
069c225b TM |
1543 | sk->sk_user_data = NULL; |
1544 | release_sock(sk); | |
69b6ba37 TM |
1545 | } |
1546 | ||
1547 | /* | |
1548 | * Disconnect the socket, and reset the callbacks | |
1549 | */ | |
1550 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1551 | { | |
1552 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1553 | ||
1554 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1555 | ||
1556 | svc_sock_detach(xprt); | |
1557 | ||
31d68ef6 BF |
1558 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1559 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1560 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1561 | } |
755cceab TT |
1562 | } |
1563 | ||
1564 | /* | |
1565 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1566 | */ | |
1567 | static void svc_sock_free(struct svc_xprt *xprt) | |
1568 | { | |
1569 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1570 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1571 | ||
755cceab TT |
1572 | if (svsk->sk_sock->file) |
1573 | sockfd_put(svsk->sk_sock); | |
1574 | else | |
1575 | sock_release(svsk->sk_sock); | |
1576 | kfree(svsk); | |
1577 | } | |
7652e5a0 | 1578 | |
9e00abc3 | 1579 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
7652e5a0 | 1580 | /* |
1f11a034 | 1581 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1582 | */ |
1f11a034 AA |
1583 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1584 | int protocol, | |
1585 | struct net *net, | |
1586 | struct sockaddr *sin, int len, | |
1587 | int flags) | |
7652e5a0 BH |
1588 | { |
1589 | struct svc_sock *svsk; | |
1f11a034 AA |
1590 | struct svc_xprt *xprt; |
1591 | ||
1592 | if (protocol != IPPROTO_TCP) { | |
1593 | printk(KERN_WARNING "svc: only TCP sockets" | |
1594 | " supported on shared back channel\n"); | |
1595 | return ERR_PTR(-EINVAL); | |
1596 | } | |
7652e5a0 | 1597 | |
7652e5a0 BH |
1598 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1599 | if (!svsk) | |
1f11a034 | 1600 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1601 | |
1602 | xprt = &svsk->sk_xprt; | |
bd4620dd | 1603 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
1f11a034 | 1604 | |
4a19de0f | 1605 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1606 | |
7652e5a0 BH |
1607 | return xprt; |
1608 | } | |
7652e5a0 BH |
1609 | |
1610 | /* | |
1f11a034 | 1611 | * Free a back channel svc_sock. |
7652e5a0 | 1612 | */ |
1f11a034 | 1613 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1614 | { |
778be232 | 1615 | if (xprt) |
7652e5a0 BH |
1616 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1617 | } | |
9e00abc3 | 1618 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |