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); |
02fc6c36 | 412 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 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 | { | |
434 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
435 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
436 | int required; | |
437 | ||
438 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
439 | return 1; | |
440 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
441 | if (sk_stream_wspace(svsk->sk_sk) >= required || | |
442 | (sk_stream_min_wspace(svsk->sk_sk) == 0 && | |
443 | atomic_read(&xprt->xpt_reserved) == 0)) | |
444 | return 1; | |
445 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
446 | return 0; | |
447 | } | |
448 | ||
47fcb03f TM |
449 | static void svc_tcp_write_space(struct sock *sk) |
450 | { | |
c7fb3f06 | 451 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); |
47fcb03f TM |
452 | struct socket *sock = sk->sk_socket; |
453 | ||
fa9251af TM |
454 | if (!svsk) |
455 | return; | |
456 | ||
c7fb3f06 TM |
457 | if (!sk_stream_is_writeable(sk) || !sock) |
458 | return; | |
fa9251af | 459 | if (svc_tcp_has_wspace(&svsk->sk_xprt)) { |
47fcb03f | 460 | clear_bit(SOCK_NOSPACE, &sock->flags); |
fa9251af TM |
461 | svc_write_space(sk); |
462 | } | |
47fcb03f TM |
463 | } |
464 | ||
51877680 TM |
465 | static void svc_tcp_adjust_wspace(struct svc_xprt *xprt) |
466 | { | |
467 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
468 | ||
469 | if (svc_tcp_has_wspace(xprt)) | |
470 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
471 | } | |
472 | ||
7702ce40 CL |
473 | /* |
474 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
475 | */ | |
476 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
477 | struct cmsghdr *cmh) | |
478 | { | |
479 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
480 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
481 | ||
7702ce40 CL |
482 | if (cmh->cmsg_type != IP_PKTINFO) |
483 | return 0; | |
849a1cf1 MJ |
484 | |
485 | daddr->sin_family = AF_INET; | |
486 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
487 | return 1; |
488 | } | |
489 | ||
490 | /* | |
73df66f8 | 491 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
7702ce40 CL |
492 | */ |
493 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
494 | struct cmsghdr *cmh) | |
495 | { | |
496 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
497 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
498 | ||
7702ce40 CL |
499 | if (cmh->cmsg_type != IPV6_PKTINFO) |
500 | return 0; | |
849a1cf1 MJ |
501 | |
502 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 503 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 504 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
505 | return 1; |
506 | } | |
507 | ||
9dbc240f TT |
508 | /* |
509 | * Copy the UDP datagram's destination address to the rqstp structure. | |
510 | * The 'destination' address in this case is the address to which the | |
511 | * peer sent the datagram, i.e. our local address. For multihomed | |
512 | * hosts, this can change from msg to msg. Note that only the IP | |
513 | * address changes, the port number should remain the same. | |
514 | */ | |
7702ce40 CL |
515 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
516 | struct cmsghdr *cmh) | |
95756482 | 517 | { |
7702ce40 CL |
518 | switch (cmh->cmsg_level) { |
519 | case SOL_IP: | |
520 | return svc_udp_get_dest_address4(rqstp, cmh); | |
521 | case SOL_IPV6: | |
522 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 523 | } |
7702ce40 CL |
524 | |
525 | return 0; | |
95756482 CL |
526 | } |
527 | ||
1da177e4 LT |
528 | /* |
529 | * Receive a datagram from a UDP socket. | |
530 | */ | |
0f0257ea | 531 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 532 | { |
57b1d3ba TT |
533 | struct svc_sock *svsk = |
534 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 535 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 536 | struct sk_buff *skb; |
bc375ea7 DM |
537 | union { |
538 | struct cmsghdr hdr; | |
539 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
540 | } buffer; | |
541 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
542 | struct msghdr msg = { |
543 | .msg_name = svc_addr(rqstp), | |
544 | .msg_control = cmh, | |
545 | .msg_controllen = sizeof(buffer), | |
546 | .msg_flags = MSG_DONTWAIT, | |
547 | }; | |
abc5c44d CL |
548 | size_t len; |
549 | int err; | |
1da177e4 | 550 | |
02fc6c36 | 551 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
552 | /* udp sockets need large rcvbuf as all pending |
553 | * requests are still in that buffer. sndbuf must | |
554 | * also be large enough that there is enough space | |
3262c816 GB |
555 | * for one reply per thread. We count all threads |
556 | * rather than threads in a particular pool, which | |
557 | * provides an upper bound on the number of threads | |
558 | * which will access the socket. | |
1da177e4 LT |
559 | */ |
560 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
561 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
562 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 563 | |
02fc6c36 | 564 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
565 | skb = NULL; |
566 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
567 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
568 | if (err >= 0) | |
569 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
570 | ||
571 | if (skb == NULL) { | |
572 | if (err != -EAGAIN) { | |
573 | /* possibly an icmp error */ | |
574 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 575 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 576 | } |
9f9d2ebe | 577 | return 0; |
1da177e4 | 578 | } |
9dbc240f | 579 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 580 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
581 | if (skb->tstamp.tv64 == 0) { |
582 | skb->tstamp = ktime_get_real(); | |
cca5172a | 583 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
584 | need that much accuracy */ |
585 | } | |
b7aa0bf7 | 586 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 587 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 588 | |
1da8c681 | 589 | len = skb->len; |
1da177e4 LT |
590 | rqstp->rq_arg.len = len; |
591 | ||
95756482 | 592 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 593 | |
7702ce40 | 594 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
595 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
596 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 597 | goto out_free; |
7a37f578 | 598 | } |
849a1cf1 | 599 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
600 | |
601 | if (skb_is_nonlinear(skb)) { | |
602 | /* we have to copy */ | |
603 | local_bh_disable(); | |
604 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
605 | local_bh_enable(); | |
606 | /* checksum error */ | |
22911fc5 | 607 | goto out_free; |
1da177e4 LT |
608 | } |
609 | local_bh_enable(); | |
9d410c79 | 610 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
611 | } else { |
612 | /* we can use it in-place */ | |
1da8c681 | 613 | rqstp->rq_arg.head[0].iov_base = skb->data; |
1da177e4 | 614 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
615 | if (skb_checksum_complete(skb)) |
616 | goto out_free; | |
5148bf4e | 617 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
618 | } |
619 | ||
620 | rqstp->rq_arg.page_base = 0; | |
621 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
622 | rqstp->rq_arg.head[0].iov_len = len; | |
623 | rqstp->rq_arg.page_len = 0; | |
44524359 | 624 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
625 | } else { |
626 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 627 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 628 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 | 629 | } |
afc59400 | 630 | rqstp->rq_next_page = rqstp->rq_respages+1; |
1da177e4 LT |
631 | |
632 | if (serv->sv_stats) | |
633 | serv->sv_stats->netudpcnt++; | |
634 | ||
635 | return len; | |
f23abfdb BF |
636 | out_free: |
637 | trace_kfree_skb(skb, svc_udp_recvfrom); | |
638 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
639 | return 0; | |
1da177e4 LT |
640 | } |
641 | ||
642 | static int | |
643 | svc_udp_sendto(struct svc_rqst *rqstp) | |
644 | { | |
645 | int error; | |
646 | ||
647 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
648 | if (error == -ECONNREFUSED) | |
649 | /* ICMP error on earlier request. */ | |
650 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
651 | ||
652 | return error; | |
653 | } | |
654 | ||
e831fe65 TT |
655 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
656 | { | |
657 | } | |
658 | ||
323bee32 TT |
659 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
660 | { | |
661 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 662 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
663 | unsigned long required; |
664 | ||
665 | /* | |
666 | * Set the SOCK_NOSPACE flag before checking the available | |
667 | * sock space. | |
668 | */ | |
669 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 670 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
671 | if (required*2 > sock_wspace(svsk->sk_sk)) |
672 | return 0; | |
673 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
674 | return 1; | |
675 | } | |
676 | ||
38a417cc TT |
677 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
678 | { | |
679 | BUG(); | |
680 | return NULL; | |
681 | } | |
682 | ||
b700cbb1 | 683 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 684 | struct net *net, |
b700cbb1 TT |
685 | struct sockaddr *sa, int salen, |
686 | int flags) | |
687 | { | |
62832c03 | 688 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
689 | } |
690 | ||
360d8738 | 691 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 692 | .xpo_create = svc_udp_create, |
5d137990 TT |
693 | .xpo_recvfrom = svc_udp_recvfrom, |
694 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 695 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
696 | .xpo_detach = svc_sock_detach, |
697 | .xpo_free = svc_sock_free, | |
e831fe65 | 698 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 699 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 700 | .xpo_accept = svc_udp_accept, |
16e4d93f | 701 | .xpo_secure_port = svc_sock_secure_port, |
360d8738 TT |
702 | }; |
703 | ||
704 | static struct svc_xprt_class svc_udp_class = { | |
705 | .xcl_name = "udp", | |
b700cbb1 | 706 | .xcl_owner = THIS_MODULE, |
360d8738 | 707 | .xcl_ops = &svc_udp_ops, |
49023155 | 708 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
3c45ddf8 | 709 | .xcl_ident = XPRT_TRANSPORT_UDP, |
360d8738 TT |
710 | }; |
711 | ||
bb5cf160 | 712 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 713 | { |
7702ce40 | 714 | int err, level, optname, one = 1; |
7a37f578 | 715 | |
bd4620dd SK |
716 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
717 | &svsk->sk_xprt, serv); | |
def13d74 | 718 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
fa9251af | 719 | svsk->sk_sk->sk_data_ready = svc_data_ready; |
1da177e4 | 720 | svsk->sk_sk->sk_write_space = svc_write_space; |
1da177e4 LT |
721 | |
722 | /* initialise setting must have enough space to | |
cca5172a | 723 | * receive and respond to one request. |
1da177e4 LT |
724 | * svc_udp_recvfrom will re-adjust if necessary |
725 | */ | |
726 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
727 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
728 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 729 | |
0f0257ea TT |
730 | /* data might have come in before data_ready set up */ |
731 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 732 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 733 | |
7a37f578 | 734 | /* make sure we get destination address info */ |
7702ce40 CL |
735 | switch (svsk->sk_sk->sk_family) { |
736 | case AF_INET: | |
737 | level = SOL_IP; | |
738 | optname = IP_PKTINFO; | |
739 | break; | |
740 | case AF_INET6: | |
741 | level = SOL_IPV6; | |
742 | optname = IPV6_RECVPKTINFO; | |
743 | break; | |
744 | default: | |
745 | BUG(); | |
746 | } | |
747 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
748 | (char *)&one, sizeof(one)); | |
749 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
750 | } |
751 | ||
752 | /* | |
753 | * A data_ready event on a listening socket means there's a connection | |
754 | * pending. Do not use state_change as a substitute for it. | |
755 | */ | |
676d2369 | 756 | static void svc_tcp_listen_data_ready(struct sock *sk) |
1da177e4 | 757 | { |
939bb7ef | 758 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
759 | |
760 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 761 | sk, sk->sk_state); |
1da177e4 | 762 | |
fa9251af TM |
763 | if (svsk) |
764 | svsk->sk_odata(sk); | |
939bb7ef NB |
765 | /* |
766 | * This callback may called twice when a new connection | |
767 | * is established as a child socket inherits everything | |
768 | * from a parent LISTEN socket. | |
769 | * 1) data_ready method of the parent socket will be called | |
770 | * when one of child sockets become ESTABLISHED. | |
771 | * 2) data_ready method of the child socket may be called | |
772 | * when it receives data before the socket is accepted. | |
773 | * In case of 2, we should ignore it silently. | |
774 | */ | |
775 | if (sk->sk_state == TCP_LISTEN) { | |
776 | if (svsk) { | |
02fc6c36 | 777 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 778 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
779 | } else |
780 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 781 | } |
1da177e4 LT |
782 | } |
783 | ||
784 | /* | |
785 | * A state change on a connected socket means it's dying or dead. | |
786 | */ | |
0f0257ea | 787 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 788 | { |
939bb7ef | 789 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
790 | |
791 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 792 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 793 | |
939bb7ef | 794 | if (!svsk) |
1da177e4 | 795 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 796 | else { |
fa9251af | 797 | svsk->sk_ostate(sk); |
02fc6c36 | 798 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 799 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 800 | } |
1da177e4 LT |
801 | } |
802 | ||
803 | /* | |
804 | * Accept a TCP connection | |
805 | */ | |
38a417cc | 806 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 807 | { |
38a417cc | 808 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 809 | struct sockaddr_storage addr; |
810 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 811 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
812 | struct socket *sock = svsk->sk_sock; |
813 | struct socket *newsock; | |
1da177e4 LT |
814 | struct svc_sock *newsvsk; |
815 | int err, slen; | |
5216a8e7 | 816 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
817 | |
818 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
819 | if (!sock) | |
38a417cc | 820 | return NULL; |
1da177e4 | 821 | |
02fc6c36 | 822 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
823 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
824 | if (err < 0) { | |
1da177e4 LT |
825 | if (err == -ENOMEM) |
826 | printk(KERN_WARNING "%s: no more sockets!\n", | |
827 | serv->sv_name); | |
e87cc472 JP |
828 | else if (err != -EAGAIN) |
829 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
830 | serv->sv_name, -err); | |
38a417cc | 831 | return NULL; |
1da177e4 | 832 | } |
02fc6c36 | 833 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 834 | |
cdd88b9f | 835 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 | 836 | if (err < 0) { |
e87cc472 JP |
837 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
838 | serv->sv_name, -err); | |
1da177e4 LT |
839 | goto failed; /* aborted connection or whatever */ |
840 | } | |
841 | ||
842 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
843 | * hosts here, but when we get encryption, the IP of the host won't |
844 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 845 | */ |
cdd88b9f | 846 | if (!svc_port_is_privileged(sin)) { |
a48fd0f9 | 847 | dprintk("%s: connect from unprivileged port: %s\n", |
cca5172a | 848 | serv->sv_name, |
cdd88b9f | 849 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 850 | } |
ad06e4bd | 851 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 852 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 853 | |
fa9251af TM |
854 | /* Reset the inherited callbacks before calling svc_setup_socket */ |
855 | newsock->sk->sk_state_change = svsk->sk_ostate; | |
856 | newsock->sk->sk_data_ready = svsk->sk_odata; | |
857 | newsock->sk->sk_write_space = svsk->sk_owspace; | |
858 | ||
1da177e4 LT |
859 | /* make sure that a write doesn't block forever when |
860 | * low on memory | |
861 | */ | |
862 | newsock->sk->sk_sndtimeo = HZ*30; | |
863 | ||
72c35376 BF |
864 | newsvsk = svc_setup_socket(serv, newsock, |
865 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
866 | if (IS_ERR(newsvsk)) | |
1da177e4 | 867 | goto failed; |
9dbc240f | 868 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
869 | err = kernel_getsockname(newsock, sin, &slen); |
870 | if (unlikely(err < 0)) { | |
871 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
872 | slen = offsetof(struct sockaddr, sa_data); | |
873 | } | |
9dbc240f | 874 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 875 | |
ef11ce24 N |
876 | if (sock_is_loopback(newsock->sk)) |
877 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
878 | else | |
879 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
f9f3cc4f TT |
880 | if (serv->sv_stats) |
881 | serv->sv_stats->nettcpconn++; | |
882 | ||
883 | return &newsvsk->sk_xprt; | |
884 | ||
885 | failed: | |
886 | sock_release(newsock); | |
887 | return NULL; | |
888 | } | |
889 | ||
31d68ef6 BF |
890 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
891 | { | |
892 | unsigned int i, len, npages; | |
893 | ||
8af345f5 | 894 | if (svsk->sk_datalen == 0) |
31d68ef6 | 895 | return 0; |
8af345f5 | 896 | len = svsk->sk_datalen; |
31d68ef6 BF |
897 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
898 | for (i = 0; i < npages; i++) { | |
899 | if (rqstp->rq_pages[i] != NULL) | |
900 | put_page(rqstp->rq_pages[i]); | |
901 | BUG_ON(svsk->sk_pages[i] == NULL); | |
902 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
903 | svsk->sk_pages[i] = NULL; | |
904 | } | |
905 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
906 | return len; | |
907 | } | |
908 | ||
909 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
910 | { | |
911 | unsigned int i, len, npages; | |
912 | ||
8af345f5 | 913 | if (svsk->sk_datalen == 0) |
31d68ef6 | 914 | return; |
8af345f5 | 915 | len = svsk->sk_datalen; |
31d68ef6 BF |
916 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
917 | for (i = 0; i < npages; i++) { | |
918 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
919 | rqstp->rq_pages[i] = NULL; | |
920 | } | |
921 | } | |
922 | ||
923 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
924 | { | |
925 | unsigned int i, len, npages; | |
926 | ||
8af345f5 | 927 | if (svsk->sk_datalen == 0) |
31d68ef6 | 928 | goto out; |
8af345f5 | 929 | len = svsk->sk_datalen; |
31d68ef6 BF |
930 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
931 | for (i = 0; i < npages; i++) { | |
cf3aa02c BF |
932 | if (svsk->sk_pages[i] == NULL) { |
933 | WARN_ON_ONCE(1); | |
934 | continue; | |
935 | } | |
31d68ef6 BF |
936 | put_page(svsk->sk_pages[i]); |
937 | svsk->sk_pages[i] = NULL; | |
938 | } | |
939 | out: | |
940 | svsk->sk_tcplen = 0; | |
8af345f5 | 941 | svsk->sk_datalen = 0; |
31d68ef6 BF |
942 | } |
943 | ||
1da177e4 | 944 | /* |
ad46ccf0 | 945 | * Receive fragment record header. |
8f55f3c0 | 946 | * If we haven't gotten the record length yet, get the next four bytes. |
1da177e4 | 947 | */ |
8f55f3c0 | 948 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 949 | { |
bb5cf160 | 950 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 951 | unsigned int want; |
8f55f3c0 | 952 | int len; |
1da177e4 | 953 | |
c0401ea0 | 954 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
955 | struct kvec iov; |
956 | ||
5ee78d48 | 957 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
958 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
959 | iov.iov_len = want; | |
960 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
961 | goto error; | |
962 | svsk->sk_tcplen += len; | |
963 | ||
964 | if (len < want) { | |
c0401ea0 CL |
965 | dprintk("svc: short recvfrom while reading record " |
966 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 967 | return -EAGAIN; |
1da177e4 LT |
968 | } |
969 | ||
cc248d4b | 970 | dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
836fbadb BF |
971 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
972 | serv->sv_max_mesg) { | |
3a28e331 BF |
973 | net_notice_ratelimited("RPC: fragment too large: %d\n", |
974 | svc_sock_reclen(svsk)); | |
1da177e4 LT |
975 | goto err_delete; |
976 | } | |
977 | } | |
978 | ||
cc248d4b | 979 | return svc_sock_reclen(svsk); |
31d68ef6 BF |
980 | error: |
981 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 982 | return len; |
31d68ef6 | 983 | err_delete: |
8f55f3c0 | 984 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
985 | return -EAGAIN; |
986 | } | |
987 | ||
586c52cc | 988 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 989 | { |
586c52cc | 990 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 991 | struct rpc_rqst *req = NULL; |
586c52cc TM |
992 | struct kvec *src, *dst; |
993 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
994 | __be32 xid; |
995 | __be32 calldir; | |
4cfc7e60 | 996 | |
4cfc7e60 RI |
997 | xid = *p++; |
998 | calldir = *p; | |
999 | ||
093a1468 | 1000 | if (!bc_xprt) |
586c52cc | 1001 | return -EAGAIN; |
093a1468 TM |
1002 | spin_lock_bh(&bc_xprt->transport_lock); |
1003 | req = xprt_lookup_rqst(bc_xprt, xid); | |
1004 | if (!req) | |
1005 | goto unlock_notfound; | |
586c52cc TM |
1006 | |
1007 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1008 | /* | |
1009 | * XXX!: cheating for now! Only copying HEAD. | |
1010 | * But we know this is good enough for now (in fact, for any | |
1011 | * callback reply in the forseeable future). | |
1012 | */ | |
1013 | dst = &req->rq_private_buf.head[0]; | |
1014 | src = &rqstp->rq_arg.head[0]; | |
1015 | if (dst->iov_len < src->iov_len) | |
093a1468 | 1016 | goto unlock_eagain; /* whatever; just giving up. */ |
586c52cc | 1017 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
cc248d4b | 1018 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
586c52cc | 1019 | rqstp->rq_arg.len = 0; |
093a1468 | 1020 | spin_unlock_bh(&bc_xprt->transport_lock); |
586c52cc | 1021 | return 0; |
093a1468 TM |
1022 | unlock_notfound: |
1023 | printk(KERN_NOTICE | |
1024 | "%s: Got unrecognized reply: " | |
1025 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1026 | __func__, ntohl(calldir), | |
1027 | bc_xprt, ntohl(xid)); | |
1028 | unlock_eagain: | |
1029 | spin_unlock_bh(&bc_xprt->transport_lock); | |
1030 | return -EAGAIN; | |
586c52cc TM |
1031 | } |
1032 | ||
1033 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1034 | { | |
1035 | int i = 0; | |
1036 | int t = 0; | |
1037 | ||
1038 | while (t < len) { | |
1039 | vec[i].iov_base = page_address(pages[i]); | |
1040 | vec[i].iov_len = PAGE_SIZE; | |
1041 | i++; | |
1042 | t += PAGE_SIZE; | |
1043 | } | |
1044 | return i; | |
4cfc7e60 RI |
1045 | } |
1046 | ||
836fbadb BF |
1047 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
1048 | { | |
1049 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
836fbadb BF |
1050 | dprintk("svc: TCP %s record (%d bytes)\n", |
1051 | svc_sock_final_rec(svsk) ? "final" : "nonfinal", | |
1052 | svc_sock_reclen(svsk)); | |
1053 | svsk->sk_tcplen = 0; | |
1054 | svsk->sk_reclen = 0; | |
1055 | } | |
31d68ef6 | 1056 | |
8f55f3c0 AB |
1057 | /* |
1058 | * Receive data from a TCP socket. | |
1059 | */ | |
1060 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1061 | { | |
1062 | struct svc_sock *svsk = | |
1063 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1064 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1065 | int len; | |
1066 | struct kvec *vec; | |
31d68ef6 | 1067 | unsigned int want, base; |
586c52cc TM |
1068 | __be32 *p; |
1069 | __be32 calldir; | |
5ee78d48 | 1070 | int pnum; |
8f55f3c0 AB |
1071 | |
1072 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1073 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1074 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1075 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1076 | ||
1077 | len = svc_tcp_recv_record(svsk, rqstp); | |
1078 | if (len < 0) | |
1079 | goto error; | |
1080 | ||
31d68ef6 | 1081 | base = svc_tcp_restore_pages(svsk, rqstp); |
836fbadb | 1082 | want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
31d68ef6 | 1083 | |
3cc03b16 | 1084 | vec = rqstp->rq_vec; |
4cfc7e60 | 1085 | |
586c52cc | 1086 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
836fbadb | 1087 | svsk->sk_datalen + want); |
586c52cc | 1088 | |
44524359 | 1089 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
afc59400 | 1090 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
1da177e4 LT |
1091 | |
1092 | /* Now receive data */ | |
31d68ef6 | 1093 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
8af345f5 | 1094 | if (len >= 0) { |
31d68ef6 | 1095 | svsk->sk_tcplen += len; |
8af345f5 BF |
1096 | svsk->sk_datalen += len; |
1097 | } | |
836fbadb | 1098 | if (len != want || !svc_sock_final_rec(svsk)) { |
be1e4444 | 1099 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 | 1100 | if (len < 0 && len != -EAGAIN) |
ad46ccf0 | 1101 | goto err_delete; |
836fbadb BF |
1102 | if (len == want) |
1103 | svc_tcp_fragment_received(svsk); | |
1104 | else | |
3a28e331 BF |
1105 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1106 | (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), | |
836fbadb | 1107 | svc_sock_reclen(svsk)); |
31d68ef6 BF |
1108 | goto err_noclose; |
1109 | } | |
1da177e4 | 1110 | |
1f691b07 | 1111 | if (svsk->sk_datalen < 8) { |
cf3aa02c | 1112 | svsk->sk_datalen = 0; |
ad46ccf0 | 1113 | goto err_delete; /* client is nuts. */ |
cf3aa02c | 1114 | } |
ad46ccf0 | 1115 | |
836fbadb | 1116 | rqstp->rq_arg.len = svsk->sk_datalen; |
1da177e4 | 1117 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1118 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1119 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1120 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1121 | } else |
1122 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1123 | |
5148bf4e | 1124 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 | 1125 | rqstp->rq_prot = IPPROTO_TCP; |
7501cc2b JL |
1126 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
1127 | set_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1128 | else | |
1129 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1da177e4 | 1130 | |
586c52cc TM |
1131 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1132 | calldir = p[1]; | |
8985ef0b | 1133 | if (calldir) |
586c52cc | 1134 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1135 | |
1da177e4 | 1136 | /* Reset TCP read info */ |
8af345f5 | 1137 | svsk->sk_datalen = 0; |
836fbadb | 1138 | svc_tcp_fragment_received(svsk); |
0601f793 | 1139 | |
8985ef0b BF |
1140 | if (len < 0) |
1141 | goto error; | |
1da177e4 | 1142 | |
9dbc240f | 1143 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1144 | if (serv->sv_stats) |
1145 | serv->sv_stats->nettcpcnt++; | |
1146 | ||
5ee78d48 | 1147 | return rqstp->rq_arg.len; |
1da177e4 | 1148 | |
8f55f3c0 | 1149 | error: |
31d68ef6 | 1150 | if (len != -EAGAIN) |
ad46ccf0 | 1151 | goto err_delete; |
31d68ef6 | 1152 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
9f9d2ebe | 1153 | return 0; |
ad46ccf0 | 1154 | err_delete: |
31d68ef6 BF |
1155 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
1156 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1157 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1158 | err_noclose: | |
9f9d2ebe | 1159 | return 0; /* record not complete */ |
1da177e4 LT |
1160 | } |
1161 | ||
1162 | /* | |
1163 | * Send out data on TCP socket. | |
1164 | */ | |
0f0257ea | 1165 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1166 | { |
1167 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1168 | int sent; | |
d8ed029d | 1169 | __be32 reclen; |
1da177e4 LT |
1170 | |
1171 | /* Set up the first element of the reply kvec. | |
1172 | * Any other kvecs that may be in use have been taken | |
1173 | * care of by the server implementation itself. | |
1174 | */ | |
1175 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1176 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1177 | ||
1da177e4 LT |
1178 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1179 | if (sent != xbufp->len) { | |
0f0257ea TT |
1180 | printk(KERN_NOTICE |
1181 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1182 | "- shutting down socket\n", | |
57b1d3ba | 1183 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1184 | (sent<0)?"got error":"sent only", |
1185 | sent, xbufp->len); | |
57b1d3ba | 1186 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1187 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1188 | sent = -EAGAIN; |
1189 | } | |
1190 | return sent; | |
1191 | } | |
1192 | ||
e831fe65 TT |
1193 | /* |
1194 | * Setup response header. TCP has a 4B record length field. | |
1195 | */ | |
1196 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1197 | { | |
1198 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1199 | ||
1200 | /* tcp needs a space for the record length... */ | |
1201 | svc_putnl(resv, 0); | |
1202 | } | |
1203 | ||
b700cbb1 | 1204 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1205 | struct net *net, |
b700cbb1 TT |
1206 | struct sockaddr *sa, int salen, |
1207 | int flags) | |
1208 | { | |
62832c03 | 1209 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1210 | } |
1211 | ||
9e00abc3 | 1212 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1213 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1214 | struct net *, struct sockaddr *, | |
1215 | int, int); | |
1216 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1217 | ||
1218 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1219 | struct net *net, | |
1220 | struct sockaddr *sa, int salen, | |
1221 | int flags) | |
1222 | { | |
1223 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1224 | } | |
1225 | ||
1226 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1227 | { | |
1228 | } | |
1229 | ||
1230 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1231 | .xpo_create = svc_bc_tcp_create, | |
1232 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1233 | .xpo_free = svc_bc_sock_free, | |
1234 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
16e4d93f | 1235 | .xpo_secure_port = svc_sock_secure_port, |
1f11a034 AA |
1236 | }; |
1237 | ||
1238 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1239 | .xcl_name = "tcp-bc", | |
1240 | .xcl_owner = THIS_MODULE, | |
1241 | .xcl_ops = &svc_tcp_bc_ops, | |
1242 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1243 | }; | |
16b2d1e1 AA |
1244 | |
1245 | static void svc_init_bc_xprt_sock(void) | |
1246 | { | |
1247 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1248 | } | |
1249 | ||
1250 | static void svc_cleanup_bc_xprt_sock(void) | |
1251 | { | |
1252 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1253 | } | |
9e00abc3 | 1254 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1255 | static void svc_init_bc_xprt_sock(void) |
1256 | { | |
1257 | } | |
1258 | ||
1259 | static void svc_cleanup_bc_xprt_sock(void) | |
1260 | { | |
1261 | } | |
9e00abc3 | 1262 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1263 | |
360d8738 | 1264 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1265 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1266 | .xpo_recvfrom = svc_tcp_recvfrom, |
1267 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1268 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1269 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1270 | .xpo_free = svc_sock_free, |
e831fe65 | 1271 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1272 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1273 | .xpo_accept = svc_tcp_accept, |
16e4d93f | 1274 | .xpo_secure_port = svc_sock_secure_port, |
51877680 | 1275 | .xpo_adjust_wspace = svc_tcp_adjust_wspace, |
360d8738 TT |
1276 | }; |
1277 | ||
1278 | static struct svc_xprt_class svc_tcp_class = { | |
1279 | .xcl_name = "tcp", | |
b700cbb1 | 1280 | .xcl_owner = THIS_MODULE, |
360d8738 | 1281 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1282 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
3c45ddf8 | 1283 | .xcl_ident = XPRT_TRANSPORT_TCP, |
360d8738 TT |
1284 | }; |
1285 | ||
1286 | void svc_init_xprt_sock(void) | |
1287 | { | |
1288 | svc_reg_xprt_class(&svc_tcp_class); | |
1289 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1290 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1291 | } |
1292 | ||
1293 | void svc_cleanup_xprt_sock(void) | |
1294 | { | |
1295 | svc_unreg_xprt_class(&svc_tcp_class); | |
1296 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1297 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1298 | } |
1299 | ||
bb5cf160 | 1300 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1301 | { |
1302 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1303 | |
bd4620dd SK |
1304 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1305 | &svsk->sk_xprt, serv); | |
def13d74 | 1306 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1307 | if (sk->sk_state == TCP_LISTEN) { |
1308 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1309 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1310 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1311 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1312 | } else { |
1313 | dprintk("setting up TCP socket for reading\n"); | |
1314 | sk->sk_state_change = svc_tcp_state_change; | |
fa9251af | 1315 | sk->sk_data_ready = svc_data_ready; |
47fcb03f | 1316 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1317 | |
1318 | svsk->sk_reclen = 0; | |
1319 | svsk->sk_tcplen = 0; | |
8af345f5 | 1320 | svsk->sk_datalen = 0; |
31d68ef6 | 1321 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1322 | |
b7872fe8 | 1323 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1324 | |
02fc6c36 | 1325 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1326 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1327 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1328 | } |
1329 | } | |
1330 | ||
0f0257ea | 1331 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1332 | { |
1333 | /* | |
1334 | * The number of server threads has changed. Update | |
1335 | * rcvbuf and sndbuf accordingly on all sockets | |
1336 | */ | |
8f3a6de3 | 1337 | struct svc_sock *svsk; |
1da177e4 LT |
1338 | |
1339 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1340 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1341 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1342 | spin_unlock_bh(&serv->sv_lock); |
1343 | } | |
24c3767e | 1344 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1345 | |
1da177e4 LT |
1346 | /* |
1347 | * Initialize socket for RPC use and create svc_sock struct | |
1da177e4 | 1348 | */ |
6b174337 CL |
1349 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1350 | struct socket *sock, | |
72c35376 | 1351 | int flags) |
1da177e4 LT |
1352 | { |
1353 | struct svc_sock *svsk; | |
1354 | struct sock *inet; | |
6b174337 | 1355 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1356 | int err = 0; |
1da177e4 LT |
1357 | |
1358 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1359 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1360 | if (!svsk) | |
1361 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1362 | |
1363 | inet = sock->sk; | |
1364 | ||
1365 | /* Register socket with portmapper */ | |
72c35376 BF |
1366 | if (pmap_register) |
1367 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1368 | inet->sk_protocol, |
c720c7e8 | 1369 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1370 | |
72c35376 | 1371 | if (err < 0) { |
1da177e4 | 1372 | kfree(svsk); |
72c35376 | 1373 | return ERR_PTR(err); |
1da177e4 LT |
1374 | } |
1375 | ||
1da177e4 LT |
1376 | inet->sk_user_data = svsk; |
1377 | svsk->sk_sock = sock; | |
1378 | svsk->sk_sk = inet; | |
1379 | svsk->sk_ostate = inet->sk_state_change; | |
1380 | svsk->sk_odata = inet->sk_data_ready; | |
1381 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1382 | |
1383 | /* Initialize the socket */ | |
1384 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1385 | svc_udp_init(svsk, serv); |
96604398 OK |
1386 | else { |
1387 | /* initialise setting must have enough space to | |
1388 | * receive and respond to one request. | |
1389 | */ | |
1390 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1391 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1392 | svc_tcp_init(svsk, serv); |
96604398 | 1393 | } |
1da177e4 | 1394 | |
1da177e4 LT |
1395 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1396 | svsk, svsk->sk_sk); | |
1397 | ||
1da177e4 LT |
1398 | return svsk; |
1399 | } | |
1400 | ||
30646394 SK |
1401 | bool svc_alien_sock(struct net *net, int fd) |
1402 | { | |
1403 | int err; | |
1404 | struct socket *sock = sockfd_lookup(fd, &err); | |
1405 | bool ret = false; | |
1406 | ||
1407 | if (!sock) | |
1408 | goto out; | |
1409 | if (sock_net(sock->sk) != net) | |
1410 | ret = true; | |
1411 | sockfd_put(sock); | |
1412 | out: | |
1413 | return ret; | |
1414 | } | |
1415 | EXPORT_SYMBOL_GPL(svc_alien_sock); | |
1416 | ||
bfba9ab4 CL |
1417 | /** |
1418 | * svc_addsock - add a listener socket to an RPC service | |
1419 | * @serv: pointer to RPC service to which to add a new listener | |
1420 | * @fd: file descriptor of the new listener | |
1421 | * @name_return: pointer to buffer to fill in with name of listener | |
1422 | * @len: size of the buffer | |
1423 | * | |
1424 | * Fills in socket name and returns positive length of name if successful. | |
1425 | * Name is terminated with '\n'. On error, returns a negative errno | |
1426 | * value. | |
1427 | */ | |
1428 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1429 | const size_t len) | |
b41b66d6 N |
1430 | { |
1431 | int err = 0; | |
1432 | struct socket *so = sockfd_lookup(fd, &err); | |
1433 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1434 | struct sockaddr_storage addr; |
1435 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1436 | int salen; | |
b41b66d6 N |
1437 | |
1438 | if (!so) | |
1439 | return err; | |
a8e10078 | 1440 | err = -EAFNOSUPPORT; |
205ba423 | 1441 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1442 | goto out; |
1443 | err = -EPROTONOSUPPORT; | |
1444 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1445 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1446 | goto out; |
1447 | err = -EISCONN; | |
1448 | if (so->state > SS_UNCONNECTED) | |
1449 | goto out; | |
1450 | err = -ENOENT; | |
1451 | if (!try_module_get(THIS_MODULE)) | |
1452 | goto out; | |
1453 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1454 | if (IS_ERR(svsk)) { | |
1455 | module_put(THIS_MODULE); | |
1456 | err = PTR_ERR(svsk); | |
1457 | goto out; | |
b41b66d6 | 1458 | } |
a8e10078 BF |
1459 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
1460 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
39b55301 | 1461 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1462 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1463 | out: |
1464 | sockfd_put(so); | |
1465 | return err; | |
b41b66d6 N |
1466 | } |
1467 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1468 | ||
1da177e4 LT |
1469 | /* |
1470 | * Create socket for RPC service. | |
1471 | */ | |
b700cbb1 TT |
1472 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1473 | int protocol, | |
62832c03 | 1474 | struct net *net, |
b700cbb1 TT |
1475 | struct sockaddr *sin, int len, |
1476 | int flags) | |
1da177e4 LT |
1477 | { |
1478 | struct svc_sock *svsk; | |
1479 | struct socket *sock; | |
1480 | int error; | |
1481 | int type; | |
9dbc240f TT |
1482 | struct sockaddr_storage addr; |
1483 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1484 | int newlen; | |
c69da774 TM |
1485 | int family; |
1486 | int val; | |
5216a8e7 | 1487 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1488 | |
ad06e4bd CL |
1489 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1490 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1491 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1492 | |
1493 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1494 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1495 | "sockets supported\n"); | |
b700cbb1 | 1496 | return ERR_PTR(-EINVAL); |
1da177e4 | 1497 | } |
c69da774 | 1498 | |
1da177e4 | 1499 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1500 | switch (sin->sa_family) { |
1501 | case AF_INET6: | |
1502 | family = PF_INET6; | |
1503 | break; | |
1504 | case AF_INET: | |
1505 | family = PF_INET; | |
1506 | break; | |
1507 | default: | |
1508 | return ERR_PTR(-EINVAL); | |
1509 | } | |
1da177e4 | 1510 | |
14ec63c3 | 1511 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1512 | if (error < 0) |
b700cbb1 | 1513 | return ERR_PTR(error); |
1da177e4 | 1514 | |
ed07536e PZ |
1515 | svc_reclassify_socket(sock); |
1516 | ||
c69da774 TM |
1517 | /* |
1518 | * If this is an PF_INET6 listener, we want to avoid | |
1519 | * getting requests from IPv4 remotes. Those should | |
1520 | * be shunted to a PF_INET listener via rpcbind. | |
1521 | */ | |
1522 | val = 1; | |
1523 | if (family == PF_INET6) | |
1524 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1525 | (char *)&val, sizeof(val)); | |
1526 | ||
18114746 | 1527 | if (type == SOCK_STREAM) |
4a17fd52 | 1528 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1529 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1530 | if (error < 0) |
1531 | goto bummer; | |
1da177e4 | 1532 | |
9dbc240f TT |
1533 | newlen = len; |
1534 | error = kernel_getsockname(sock, newsin, &newlen); | |
1535 | if (error < 0) | |
1536 | goto bummer; | |
1537 | ||
1da177e4 | 1538 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1539 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1540 | goto bummer; |
1541 | } | |
1542 | ||
72c35376 | 1543 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1544 | if (IS_ERR(svsk)) { |
1545 | error = PTR_ERR(svsk); | |
1546 | goto bummer; | |
e79eff1f | 1547 | } |
a8e10078 BF |
1548 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1549 | return (struct svc_xprt *)svsk; | |
1da177e4 LT |
1550 | bummer: |
1551 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1552 | sock_release(sock); | |
b700cbb1 | 1553 | return ERR_PTR(error); |
1da177e4 LT |
1554 | } |
1555 | ||
755cceab TT |
1556 | /* |
1557 | * Detach the svc_sock from the socket so that no | |
1558 | * more callbacks occur. | |
1559 | */ | |
1560 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1561 | { | |
1562 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1563 | struct sock *sk = svsk->sk_sk; | |
1564 | ||
1565 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1566 | ||
1567 | /* put back the old socket callbacks */ | |
069c225b | 1568 | lock_sock(sk); |
755cceab TT |
1569 | sk->sk_state_change = svsk->sk_ostate; |
1570 | sk->sk_data_ready = svsk->sk_odata; | |
1571 | sk->sk_write_space = svsk->sk_owspace; | |
069c225b TM |
1572 | sk->sk_user_data = NULL; |
1573 | release_sock(sk); | |
69b6ba37 TM |
1574 | } |
1575 | ||
1576 | /* | |
1577 | * Disconnect the socket, and reset the callbacks | |
1578 | */ | |
1579 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1580 | { | |
1581 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1582 | ||
1583 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1584 | ||
1585 | svc_sock_detach(xprt); | |
1586 | ||
31d68ef6 BF |
1587 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1588 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1589 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1590 | } |
755cceab TT |
1591 | } |
1592 | ||
1593 | /* | |
1594 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1595 | */ | |
1596 | static void svc_sock_free(struct svc_xprt *xprt) | |
1597 | { | |
1598 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1599 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1600 | ||
755cceab TT |
1601 | if (svsk->sk_sock->file) |
1602 | sockfd_put(svsk->sk_sock); | |
1603 | else | |
1604 | sock_release(svsk->sk_sock); | |
1605 | kfree(svsk); | |
1606 | } | |
7652e5a0 | 1607 | |
9e00abc3 | 1608 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
7652e5a0 | 1609 | /* |
1f11a034 | 1610 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1611 | */ |
1f11a034 AA |
1612 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1613 | int protocol, | |
1614 | struct net *net, | |
1615 | struct sockaddr *sin, int len, | |
1616 | int flags) | |
7652e5a0 BH |
1617 | { |
1618 | struct svc_sock *svsk; | |
1f11a034 AA |
1619 | struct svc_xprt *xprt; |
1620 | ||
1621 | if (protocol != IPPROTO_TCP) { | |
1622 | printk(KERN_WARNING "svc: only TCP sockets" | |
1623 | " supported on shared back channel\n"); | |
1624 | return ERR_PTR(-EINVAL); | |
1625 | } | |
7652e5a0 | 1626 | |
7652e5a0 BH |
1627 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1628 | if (!svsk) | |
1f11a034 | 1629 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1630 | |
1631 | xprt = &svsk->sk_xprt; | |
bd4620dd | 1632 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
1f11a034 | 1633 | |
4a19de0f | 1634 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1635 | |
7652e5a0 BH |
1636 | return xprt; |
1637 | } | |
7652e5a0 BH |
1638 | |
1639 | /* | |
1f11a034 | 1640 | * Free a back channel svc_sock. |
7652e5a0 | 1641 | */ |
1f11a034 | 1642 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1643 | { |
778be232 | 1644 | if (xprt) |
7652e5a0 BH |
1645 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1646 | } | |
9e00abc3 | 1647 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |