Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/svcsock.c | |
3 | * | |
4 | * These are the RPC server socket internals. | |
5 | * | |
6 | * The server scheduling algorithm does not always distribute the load | |
7 | * evenly when servicing a single client. May need to modify the | |
f6150c3c | 8 | * svc_xprt_enqueue procedure... |
1da177e4 LT |
9 | * |
10 | * TCP support is largely untested and may be a little slow. The problem | |
11 | * is that we currently do two separate recvfrom's, one for the 4-byte | |
12 | * record length, and the second for the actual record. This could possibly | |
13 | * be improved by always reading a minimum size of around 100 bytes and | |
14 | * tucking any superfluous bytes away in a temporary store. Still, that | |
15 | * leaves write requests out in the rain. An alternative may be to peek at | |
16 | * the first skb in the queue, and if it matches the next TCP sequence | |
17 | * number, to extract the record marker. Yuck. | |
18 | * | |
19 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
20 | */ | |
21 | ||
172589cc | 22 | #include <linux/kernel.h> |
1da177e4 LT |
23 | #include <linux/sched.h> |
24 | #include <linux/errno.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/inet.h> | |
29 | #include <linux/udp.h> | |
91483c4b | 30 | #include <linux/tcp.h> |
1da177e4 LT |
31 | #include <linux/unistd.h> |
32 | #include <linux/slab.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/skbuff.h> | |
b41b66d6 | 35 | #include <linux/file.h> |
7dfb7103 | 36 | #include <linux/freezer.h> |
1da177e4 LT |
37 | #include <net/sock.h> |
38 | #include <net/checksum.h> | |
39 | #include <net/ip.h> | |
b92503b2 | 40 | #include <net/ipv6.h> |
b7872fe8 | 41 | #include <net/tcp.h> |
c752f073 | 42 | #include <net/tcp_states.h> |
1da177e4 LT |
43 | #include <asm/uaccess.h> |
44 | #include <asm/ioctls.h> | |
45 | ||
46 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 47 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 48 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 49 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
50 | #include <linux/sunrpc/svcsock.h> |
51 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 52 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 53 | |
177e4f99 HS |
54 | #include "sunrpc.h" |
55 | ||
360d8738 | 56 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
57 | |
58 | ||
59 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 60 | int *errp, int flags); |
1da177e4 LT |
61 | static void svc_udp_data_ready(struct sock *, int); |
62 | static int svc_udp_recvfrom(struct svc_rqst *); | |
63 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 64 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 65 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 66 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 67 | |
b700cbb1 | 68 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
69 | struct net *, struct sockaddr *, |
70 | int, int); | |
9e00abc3 | 71 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
72 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
73 | struct net *, struct sockaddr *, | |
74 | int, int); | |
75 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
9e00abc3 | 76 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 77 | |
ed07536e PZ |
78 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
79 | static struct lock_class_key svc_key[2]; | |
80 | static struct lock_class_key svc_slock_key[2]; | |
81 | ||
0f0257ea | 82 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
83 | { |
84 | struct sock *sk = sock->sk; | |
02b3d346 | 85 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
86 | switch (sk->sk_family) { |
87 | case AF_INET: | |
88 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
89 | &svc_slock_key[0], |
90 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
91 | &svc_key[0]); | |
ed07536e PZ |
92 | break; |
93 | ||
94 | case AF_INET6: | |
95 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
96 | &svc_slock_key[1], |
97 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
98 | &svc_key[1]); | |
ed07536e PZ |
99 | break; |
100 | ||
101 | default: | |
102 | BUG(); | |
103 | } | |
104 | } | |
105 | #else | |
0f0257ea | 106 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
107 | { |
108 | } | |
109 | #endif | |
110 | ||
1da177e4 LT |
111 | /* |
112 | * Release an skbuff after use | |
113 | */ | |
5148bf4e | 114 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 115 | { |
5148bf4e | 116 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
117 | |
118 | if (skb) { | |
57b1d3ba TT |
119 | struct svc_sock *svsk = |
120 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 121 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
122 | |
123 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 124 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 125 | } |
1da177e4 LT |
126 | } |
127 | ||
b92503b2 CL |
128 | union svc_pktinfo_u { |
129 | struct in_pktinfo pkti; | |
b92503b2 | 130 | struct in6_pktinfo pkti6; |
b92503b2 | 131 | }; |
bc375ea7 DM |
132 | #define SVC_PKTINFO_SPACE \ |
133 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
134 | |
135 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
136 | { | |
57b1d3ba TT |
137 | struct svc_sock *svsk = |
138 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
139 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
140 | case AF_INET: { |
141 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
142 | ||
143 | cmh->cmsg_level = SOL_IP; | |
144 | cmh->cmsg_type = IP_PKTINFO; | |
145 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
146 | pki->ipi_spec_dst.s_addr = |
147 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
148 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
149 | } | |
150 | break; | |
5a05ed73 | 151 | |
b92503b2 CL |
152 | case AF_INET6: { |
153 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 154 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
155 | |
156 | cmh->cmsg_level = SOL_IPV6; | |
157 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 MJ |
158 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
159 | ipv6_addr_copy(&pki->ipi6_addr, &daddr->sin6_addr); | |
b92503b2 CL |
160 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
161 | } | |
162 | break; | |
b92503b2 | 163 | } |
b92503b2 CL |
164 | } |
165 | ||
1da177e4 | 166 | /* |
4cfc7e60 | 167 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 168 | */ |
4cfc7e60 RI |
169 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
170 | struct page *headpage, unsigned long headoffset, | |
171 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 172 | { |
1da177e4 LT |
173 | int result; |
174 | int size; | |
175 | struct page **ppage = xdr->pages; | |
176 | size_t base = xdr->page_base; | |
177 | unsigned int pglen = xdr->page_len; | |
178 | unsigned int flags = MSG_MORE; | |
4cfc7e60 RI |
179 | int slen; |
180 | int len = 0; | |
1da177e4 LT |
181 | |
182 | slen = xdr->len; | |
183 | ||
1da177e4 LT |
184 | /* send head */ |
185 | if (slen == xdr->head[0].iov_len) | |
186 | flags = 0; | |
4cfc7e60 | 187 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 188 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
189 | if (len != xdr->head[0].iov_len) |
190 | goto out; | |
191 | slen -= xdr->head[0].iov_len; | |
192 | if (slen == 0) | |
193 | goto out; | |
194 | ||
195 | /* send page data */ | |
196 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
197 | while (pglen > 0) { | |
198 | if (slen == size) | |
199 | flags = 0; | |
e6242e92 | 200 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
201 | if (result > 0) |
202 | len += result; | |
203 | if (result != size) | |
204 | goto out; | |
205 | slen -= size; | |
206 | pglen -= size; | |
207 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
208 | base = 0; | |
209 | ppage++; | |
210 | } | |
4cfc7e60 | 211 | |
1da177e4 LT |
212 | /* send tail */ |
213 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
214 | result = kernel_sendpage(sock, tailpage, tailoffset, |
215 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
216 | if (result > 0) |
217 | len += result; | |
218 | } | |
4cfc7e60 RI |
219 | |
220 | out: | |
221 | return len; | |
222 | } | |
223 | ||
224 | ||
225 | /* | |
226 | * Generic sendto routine | |
227 | */ | |
228 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
229 | { | |
230 | struct svc_sock *svsk = | |
231 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
232 | struct socket *sock = svsk->sk_sock; | |
233 | union { | |
234 | struct cmsghdr hdr; | |
235 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
236 | } buffer; | |
237 | struct cmsghdr *cmh = &buffer.hdr; | |
238 | int len = 0; | |
239 | unsigned long tailoff; | |
240 | unsigned long headoff; | |
241 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
242 | ||
243 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
244 | struct msghdr msg = { | |
245 | .msg_name = &rqstp->rq_addr, | |
246 | .msg_namelen = rqstp->rq_addrlen, | |
247 | .msg_control = cmh, | |
248 | .msg_controllen = sizeof(buffer), | |
249 | .msg_flags = MSG_MORE, | |
250 | }; | |
251 | ||
252 | svc_set_cmsg_data(rqstp, cmh); | |
253 | ||
254 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
255 | goto out; | |
256 | } | |
257 | ||
258 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
259 | headoff = 0; | |
260 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
261 | rqstp->rq_respages[0], tailoff); | |
262 | ||
1da177e4 | 263 | out: |
ad06e4bd | 264 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 265 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 266 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
267 | |
268 | return len; | |
269 | } | |
270 | ||
80212d59 N |
271 | /* |
272 | * Report socket names for nfsdfs | |
273 | */ | |
e7942b9f | 274 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 275 | { |
017cb47f CL |
276 | const struct sock *sk = svsk->sk_sk; |
277 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
278 | "udp" : "tcp"; | |
80212d59 N |
279 | int len; |
280 | ||
017cb47f | 281 | switch (sk->sk_family) { |
e7942b9f CL |
282 | case PF_INET: |
283 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 284 | proto_name, |
c720c7e8 ED |
285 | &inet_sk(sk)->inet_rcv_saddr, |
286 | inet_sk(sk)->inet_num); | |
80212d59 | 287 | break; |
58de2f86 CL |
288 | case PF_INET6: |
289 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f CL |
290 | proto_name, |
291 | &inet6_sk(sk)->rcv_saddr, | |
c720c7e8 | 292 | inet_sk(sk)->inet_num); |
80212d59 N |
293 | break; |
294 | default: | |
e7942b9f | 295 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 296 | sk->sk_family); |
80212d59 | 297 | } |
e7942b9f CL |
298 | |
299 | if (len >= remaining) { | |
300 | *buf = '\0'; | |
301 | return -ENAMETOOLONG; | |
80212d59 N |
302 | } |
303 | return len; | |
304 | } | |
305 | ||
8435d34d CL |
306 | /** |
307 | * svc_sock_names - construct a list of listener names in a string | |
308 | * @serv: pointer to RPC service | |
309 | * @buf: pointer to a buffer to fill in with socket names | |
310 | * @buflen: size of the buffer to be filled | |
311 | * @toclose: pointer to '\0'-terminated C string containing the name | |
312 | * of a listener to be closed | |
313 | * | |
314 | * Fills in @buf with a '\n'-separated list of names of listener | |
315 | * sockets. If @toclose is not NULL, the socket named by @toclose | |
316 | * is closed, and is not included in the output list. | |
317 | * | |
318 | * Returns positive length of the socket name string, or a negative | |
319 | * errno value on error. | |
320 | */ | |
321 | int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen, | |
322 | const char *toclose) | |
80212d59 | 323 | { |
b41b66d6 | 324 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
325 | int len = 0; |
326 | ||
327 | if (!serv) | |
328 | return 0; | |
e7942b9f | 329 | |
aaf68cfb | 330 | spin_lock_bh(&serv->sv_lock); |
7a182083 | 331 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
e7942b9f CL |
332 | int onelen = svc_one_sock_name(svsk, buf + len, buflen - len); |
333 | if (onelen < 0) { | |
334 | len = onelen; | |
335 | break; | |
336 | } | |
3942302e | 337 | if (toclose && strcmp(toclose, buf + len) == 0) { |
b41b66d6 | 338 | closesk = svsk; |
3942302e N |
339 | svc_xprt_get(&closesk->sk_xprt); |
340 | } else | |
b41b66d6 | 341 | len += onelen; |
80212d59 | 342 | } |
aaf68cfb | 343 | spin_unlock_bh(&serv->sv_lock); |
e7942b9f | 344 | |
3942302e | 345 | if (closesk) { |
5680c446 N |
346 | /* Should unregister with portmap, but you cannot |
347 | * unregister just one protocol... | |
348 | */ | |
7a182083 | 349 | svc_close_xprt(&closesk->sk_xprt); |
3942302e N |
350 | svc_xprt_put(&closesk->sk_xprt); |
351 | } else if (toclose) | |
37a03472 | 352 | return -ENOENT; |
80212d59 N |
353 | return len; |
354 | } | |
24c3767e | 355 | EXPORT_SYMBOL_GPL(svc_sock_names); |
80212d59 | 356 | |
1da177e4 LT |
357 | /* |
358 | * Check input queue length | |
359 | */ | |
0f0257ea | 360 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 361 | { |
1da177e4 LT |
362 | struct socket *sock = svsk->sk_sock; |
363 | int avail, err; | |
364 | ||
e6242e92 | 365 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
366 | |
367 | return (err >= 0)? avail : err; | |
368 | } | |
369 | ||
370 | /* | |
371 | * Generic recvfrom routine. | |
372 | */ | |
0f0257ea TT |
373 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
374 | int buflen) | |
1da177e4 | 375 | { |
57b1d3ba TT |
376 | struct svc_sock *svsk = |
377 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
378 | struct msghdr msg = { |
379 | .msg_flags = MSG_DONTWAIT, | |
380 | }; | |
381 | int len; | |
1da177e4 | 382 | |
260c1d12 TT |
383 | rqstp->rq_xprt_hlen = 0; |
384 | ||
1ba95105 CL |
385 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
386 | msg.msg_flags); | |
1da177e4 | 387 | |
1da177e4 | 388 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 389 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
390 | return len; |
391 | } | |
392 | ||
31d68ef6 BF |
393 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
394 | struct kvec *iov, int nr, | |
395 | int buflen, unsigned int base) | |
396 | { | |
397 | size_t save_iovlen; | |
398 | void __user *save_iovbase; | |
399 | unsigned int i; | |
400 | int ret; | |
401 | ||
402 | if (base == 0) | |
403 | return svc_recvfrom(rqstp, iov, nr, buflen); | |
404 | ||
405 | for (i = 0; i < nr; i++) { | |
406 | if (iov[i].iov_len > base) | |
407 | break; | |
408 | base -= iov[i].iov_len; | |
409 | } | |
410 | save_iovlen = iov[i].iov_len; | |
411 | save_iovbase = iov[i].iov_base; | |
412 | iov[i].iov_len -= base; | |
413 | iov[i].iov_base += base; | |
414 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); | |
415 | iov[i].iov_len = save_iovlen; | |
416 | iov[i].iov_base = save_iovbase; | |
417 | return ret; | |
418 | } | |
419 | ||
1da177e4 LT |
420 | /* |
421 | * Set socket snd and rcv buffer lengths | |
422 | */ | |
0f0257ea TT |
423 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
424 | unsigned int rcv) | |
1da177e4 LT |
425 | { |
426 | #if 0 | |
427 | mm_segment_t oldfs; | |
428 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
429 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
430 | (char*)&snd, sizeof(snd)); | |
431 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
432 | (char*)&rcv, sizeof(rcv)); | |
433 | #else | |
434 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
435 | * which isn't acceptable. Until that is made conditional | |
436 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
437 | * DaveM said I could! | |
438 | */ | |
439 | lock_sock(sock->sk); | |
440 | sock->sk->sk_sndbuf = snd * 2; | |
441 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 442 | sock->sk->sk_write_space(sock->sk); |
1da177e4 LT |
443 | release_sock(sock->sk); |
444 | #endif | |
445 | } | |
446 | /* | |
447 | * INET callback when data has been received on the socket. | |
448 | */ | |
0f0257ea | 449 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 450 | { |
939bb7ef | 451 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 452 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 | 453 | |
939bb7ef NB |
454 | if (svsk) { |
455 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
456 | svsk, sk, count, |
457 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
458 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 459 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 460 | } |
eaefd110 ED |
461 | if (wq && waitqueue_active(wq)) |
462 | wake_up_interruptible(wq); | |
1da177e4 LT |
463 | } |
464 | ||
465 | /* | |
466 | * INET callback when space is newly available on the socket. | |
467 | */ | |
0f0257ea | 468 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
469 | { |
470 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
eaefd110 | 471 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
472 | |
473 | if (svsk) { | |
474 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 475 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 476 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
477 | } |
478 | ||
eaefd110 | 479 | if (wq && waitqueue_active(wq)) { |
939bb7ef | 480 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 | 481 | svsk); |
eaefd110 | 482 | wake_up_interruptible(wq); |
1da177e4 LT |
483 | } |
484 | } | |
485 | ||
47fcb03f TM |
486 | static void svc_tcp_write_space(struct sock *sk) |
487 | { | |
488 | struct socket *sock = sk->sk_socket; | |
489 | ||
490 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) | |
491 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
492 | svc_write_space(sk); | |
493 | } | |
494 | ||
7702ce40 CL |
495 | /* |
496 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
497 | */ | |
498 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
499 | struct cmsghdr *cmh) | |
500 | { | |
501 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
502 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
503 | ||
7702ce40 CL |
504 | if (cmh->cmsg_type != IP_PKTINFO) |
505 | return 0; | |
849a1cf1 MJ |
506 | |
507 | daddr->sin_family = AF_INET; | |
508 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
509 | return 1; |
510 | } | |
511 | ||
512 | /* | |
513 | * See net/ipv6/datagram.c : datagram_recv_ctl | |
514 | */ | |
515 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
516 | struct cmsghdr *cmh) | |
517 | { | |
518 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
519 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
520 | ||
7702ce40 CL |
521 | if (cmh->cmsg_type != IPV6_PKTINFO) |
522 | return 0; | |
849a1cf1 MJ |
523 | |
524 | daddr->sin6_family = AF_INET6; | |
525 | ipv6_addr_copy(&daddr->sin6_addr, &pki->ipi6_addr); | |
526 | daddr->sin6_scope_id = pki->ipi6_ifindex; | |
7702ce40 CL |
527 | return 1; |
528 | } | |
529 | ||
9dbc240f TT |
530 | /* |
531 | * Copy the UDP datagram's destination address to the rqstp structure. | |
532 | * The 'destination' address in this case is the address to which the | |
533 | * peer sent the datagram, i.e. our local address. For multihomed | |
534 | * hosts, this can change from msg to msg. Note that only the IP | |
535 | * address changes, the port number should remain the same. | |
536 | */ | |
7702ce40 CL |
537 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
538 | struct cmsghdr *cmh) | |
95756482 | 539 | { |
7702ce40 CL |
540 | switch (cmh->cmsg_level) { |
541 | case SOL_IP: | |
542 | return svc_udp_get_dest_address4(rqstp, cmh); | |
543 | case SOL_IPV6: | |
544 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 545 | } |
7702ce40 CL |
546 | |
547 | return 0; | |
95756482 CL |
548 | } |
549 | ||
1da177e4 LT |
550 | /* |
551 | * Receive a datagram from a UDP socket. | |
552 | */ | |
0f0257ea | 553 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 554 | { |
57b1d3ba TT |
555 | struct svc_sock *svsk = |
556 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 557 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 558 | struct sk_buff *skb; |
bc375ea7 DM |
559 | union { |
560 | struct cmsghdr hdr; | |
561 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
562 | } buffer; | |
563 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
564 | struct msghdr msg = { |
565 | .msg_name = svc_addr(rqstp), | |
566 | .msg_control = cmh, | |
567 | .msg_controllen = sizeof(buffer), | |
568 | .msg_flags = MSG_DONTWAIT, | |
569 | }; | |
abc5c44d CL |
570 | size_t len; |
571 | int err; | |
1da177e4 | 572 | |
02fc6c36 | 573 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
574 | /* udp sockets need large rcvbuf as all pending |
575 | * requests are still in that buffer. sndbuf must | |
576 | * also be large enough that there is enough space | |
3262c816 GB |
577 | * for one reply per thread. We count all threads |
578 | * rather than threads in a particular pool, which | |
579 | * provides an upper bound on the number of threads | |
580 | * which will access the socket. | |
1da177e4 LT |
581 | */ |
582 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
583 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
584 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 585 | |
02fc6c36 | 586 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
587 | skb = NULL; |
588 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
589 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
590 | if (err >= 0) | |
591 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
592 | ||
593 | if (skb == NULL) { | |
594 | if (err != -EAGAIN) { | |
595 | /* possibly an icmp error */ | |
596 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 597 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 598 | } |
05ed690e | 599 | return -EAGAIN; |
1da177e4 | 600 | } |
9dbc240f | 601 | len = svc_addr_len(svc_addr(rqstp)); |
abc5c44d CL |
602 | if (len == 0) |
603 | return -EAFNOSUPPORT; | |
9dbc240f | 604 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
605 | if (skb->tstamp.tv64 == 0) { |
606 | skb->tstamp = ktime_get_real(); | |
cca5172a | 607 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
608 | need that much accuracy */ |
609 | } | |
b7aa0bf7 | 610 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 611 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 612 | |
1da177e4 LT |
613 | len = skb->len - sizeof(struct udphdr); |
614 | rqstp->rq_arg.len = len; | |
615 | ||
95756482 | 616 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 617 | |
7702ce40 | 618 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
7a37f578 | 619 | if (net_ratelimit()) |
7702ce40 CL |
620 | printk(KERN_WARNING |
621 | "svc: received unknown control message %d/%d; " | |
622 | "dropping RPC reply datagram\n", | |
623 | cmh->cmsg_level, cmh->cmsg_type); | |
9d410c79 | 624 | skb_free_datagram_locked(svsk->sk_sk, skb); |
7a37f578 N |
625 | return 0; |
626 | } | |
849a1cf1 | 627 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
628 | |
629 | if (skb_is_nonlinear(skb)) { | |
630 | /* we have to copy */ | |
631 | local_bh_disable(); | |
632 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
633 | local_bh_enable(); | |
634 | /* checksum error */ | |
9d410c79 | 635 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
636 | return 0; |
637 | } | |
638 | local_bh_enable(); | |
9d410c79 | 639 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 LT |
640 | } else { |
641 | /* we can use it in-place */ | |
0f0257ea TT |
642 | rqstp->rq_arg.head[0].iov_base = skb->data + |
643 | sizeof(struct udphdr); | |
1da177e4 | 644 | rqstp->rq_arg.head[0].iov_len = len; |
fb286bb2 | 645 | if (skb_checksum_complete(skb)) { |
9d410c79 | 646 | skb_free_datagram_locked(svsk->sk_sk, skb); |
fb286bb2 | 647 | return 0; |
1da177e4 | 648 | } |
5148bf4e | 649 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
650 | } |
651 | ||
652 | rqstp->rq_arg.page_base = 0; | |
653 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
654 | rqstp->rq_arg.head[0].iov_len = len; | |
655 | rqstp->rq_arg.page_len = 0; | |
44524359 | 656 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
657 | } else { |
658 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 659 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 660 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
661 | } |
662 | ||
663 | if (serv->sv_stats) | |
664 | serv->sv_stats->netudpcnt++; | |
665 | ||
666 | return len; | |
667 | } | |
668 | ||
669 | static int | |
670 | svc_udp_sendto(struct svc_rqst *rqstp) | |
671 | { | |
672 | int error; | |
673 | ||
674 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
675 | if (error == -ECONNREFUSED) | |
676 | /* ICMP error on earlier request. */ | |
677 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
678 | ||
679 | return error; | |
680 | } | |
681 | ||
e831fe65 TT |
682 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
683 | { | |
684 | } | |
685 | ||
323bee32 TT |
686 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
687 | { | |
688 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 689 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
690 | unsigned long required; |
691 | ||
692 | /* | |
693 | * Set the SOCK_NOSPACE flag before checking the available | |
694 | * sock space. | |
695 | */ | |
696 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 697 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
698 | if (required*2 > sock_wspace(svsk->sk_sk)) |
699 | return 0; | |
700 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
701 | return 1; | |
702 | } | |
703 | ||
38a417cc TT |
704 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
705 | { | |
706 | BUG(); | |
707 | return NULL; | |
708 | } | |
709 | ||
b700cbb1 | 710 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 711 | struct net *net, |
b700cbb1 TT |
712 | struct sockaddr *sa, int salen, |
713 | int flags) | |
714 | { | |
62832c03 | 715 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
716 | } |
717 | ||
360d8738 | 718 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 719 | .xpo_create = svc_udp_create, |
5d137990 TT |
720 | .xpo_recvfrom = svc_udp_recvfrom, |
721 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 722 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
723 | .xpo_detach = svc_sock_detach, |
724 | .xpo_free = svc_sock_free, | |
e831fe65 | 725 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 726 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 727 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
728 | }; |
729 | ||
730 | static struct svc_xprt_class svc_udp_class = { | |
731 | .xcl_name = "udp", | |
b700cbb1 | 732 | .xcl_owner = THIS_MODULE, |
360d8738 | 733 | .xcl_ops = &svc_udp_ops, |
49023155 | 734 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
735 | }; |
736 | ||
bb5cf160 | 737 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 738 | { |
7702ce40 | 739 | int err, level, optname, one = 1; |
7a37f578 | 740 | |
bb5cf160 | 741 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); |
def13d74 | 742 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
743 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
744 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
745 | |
746 | /* initialise setting must have enough space to | |
cca5172a | 747 | * receive and respond to one request. |
1da177e4 LT |
748 | * svc_udp_recvfrom will re-adjust if necessary |
749 | */ | |
750 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
751 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
752 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 753 | |
0f0257ea TT |
754 | /* data might have come in before data_ready set up */ |
755 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 756 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 757 | |
7a37f578 | 758 | /* make sure we get destination address info */ |
7702ce40 CL |
759 | switch (svsk->sk_sk->sk_family) { |
760 | case AF_INET: | |
761 | level = SOL_IP; | |
762 | optname = IP_PKTINFO; | |
763 | break; | |
764 | case AF_INET6: | |
765 | level = SOL_IPV6; | |
766 | optname = IPV6_RECVPKTINFO; | |
767 | break; | |
768 | default: | |
769 | BUG(); | |
770 | } | |
771 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
772 | (char *)&one, sizeof(one)); | |
773 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
774 | } |
775 | ||
776 | /* | |
777 | * A data_ready event on a listening socket means there's a connection | |
778 | * pending. Do not use state_change as a substitute for it. | |
779 | */ | |
0f0257ea | 780 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 781 | { |
939bb7ef | 782 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 783 | wait_queue_head_t *wq; |
1da177e4 LT |
784 | |
785 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 786 | sk, sk->sk_state); |
1da177e4 | 787 | |
939bb7ef NB |
788 | /* |
789 | * This callback may called twice when a new connection | |
790 | * is established as a child socket inherits everything | |
791 | * from a parent LISTEN socket. | |
792 | * 1) data_ready method of the parent socket will be called | |
793 | * when one of child sockets become ESTABLISHED. | |
794 | * 2) data_ready method of the child socket may be called | |
795 | * when it receives data before the socket is accepted. | |
796 | * In case of 2, we should ignore it silently. | |
797 | */ | |
798 | if (sk->sk_state == TCP_LISTEN) { | |
799 | if (svsk) { | |
02fc6c36 | 800 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 801 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
802 | } else |
803 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 804 | } |
939bb7ef | 805 | |
eaefd110 ED |
806 | wq = sk_sleep(sk); |
807 | if (wq && waitqueue_active(wq)) | |
808 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
809 | } |
810 | ||
811 | /* | |
812 | * A state change on a connected socket means it's dying or dead. | |
813 | */ | |
0f0257ea | 814 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 815 | { |
939bb7ef | 816 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 817 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
818 | |
819 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 820 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 821 | |
939bb7ef | 822 | if (!svsk) |
1da177e4 | 823 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 824 | else { |
02fc6c36 | 825 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 826 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 827 | } |
eaefd110 ED |
828 | if (wq && waitqueue_active(wq)) |
829 | wake_up_interruptible_all(wq); | |
1da177e4 LT |
830 | } |
831 | ||
0f0257ea | 832 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 833 | { |
939bb7ef | 834 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
eaefd110 | 835 | wait_queue_head_t *wq = sk_sleep(sk); |
1da177e4 LT |
836 | |
837 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
838 | sk, sk->sk_user_data); |
839 | if (svsk) { | |
02fc6c36 | 840 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 841 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 842 | } |
eaefd110 ED |
843 | if (wq && waitqueue_active(wq)) |
844 | wake_up_interruptible(wq); | |
1da177e4 LT |
845 | } |
846 | ||
847 | /* | |
848 | * Accept a TCP connection | |
849 | */ | |
38a417cc | 850 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 851 | { |
38a417cc | 852 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 853 | struct sockaddr_storage addr; |
854 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 855 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
856 | struct socket *sock = svsk->sk_sock; |
857 | struct socket *newsock; | |
1da177e4 LT |
858 | struct svc_sock *newsvsk; |
859 | int err, slen; | |
5216a8e7 | 860 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
861 | |
862 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
863 | if (!sock) | |
38a417cc | 864 | return NULL; |
1da177e4 | 865 | |
02fc6c36 | 866 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
867 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
868 | if (err < 0) { | |
1da177e4 LT |
869 | if (err == -ENOMEM) |
870 | printk(KERN_WARNING "%s: no more sockets!\n", | |
871 | serv->sv_name); | |
e6242e92 | 872 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
873 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
874 | serv->sv_name, -err); | |
38a417cc | 875 | return NULL; |
1da177e4 | 876 | } |
02fc6c36 | 877 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 878 | |
cdd88b9f | 879 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
880 | if (err < 0) { |
881 | if (net_ratelimit()) | |
882 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
883 | serv->sv_name, -err); | |
884 | goto failed; /* aborted connection or whatever */ | |
885 | } | |
886 | ||
887 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
888 | * hosts here, but when we get encryption, the IP of the host won't |
889 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 890 | */ |
cdd88b9f | 891 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 892 | dprintk(KERN_WARNING |
ad06e4bd | 893 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 894 | serv->sv_name, |
cdd88b9f | 895 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 896 | } |
ad06e4bd | 897 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 898 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
899 | |
900 | /* make sure that a write doesn't block forever when | |
901 | * low on memory | |
902 | */ | |
903 | newsock->sk->sk_sndtimeo = HZ*30; | |
904 | ||
6b174337 CL |
905 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
906 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 907 | goto failed; |
9dbc240f | 908 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
909 | err = kernel_getsockname(newsock, sin, &slen); |
910 | if (unlikely(err < 0)) { | |
911 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
912 | slen = offsetof(struct sockaddr, sa_data); | |
913 | } | |
9dbc240f | 914 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 915 | |
f9f3cc4f TT |
916 | if (serv->sv_stats) |
917 | serv->sv_stats->nettcpconn++; | |
918 | ||
919 | return &newsvsk->sk_xprt; | |
920 | ||
921 | failed: | |
922 | sock_release(newsock); | |
923 | return NULL; | |
924 | } | |
925 | ||
31d68ef6 BF |
926 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
927 | { | |
928 | unsigned int i, len, npages; | |
929 | ||
930 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
931 | return 0; | |
932 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
933 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
934 | for (i = 0; i < npages; i++) { | |
935 | if (rqstp->rq_pages[i] != NULL) | |
936 | put_page(rqstp->rq_pages[i]); | |
937 | BUG_ON(svsk->sk_pages[i] == NULL); | |
938 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
939 | svsk->sk_pages[i] = NULL; | |
940 | } | |
941 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
942 | return len; | |
943 | } | |
944 | ||
945 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
946 | { | |
947 | unsigned int i, len, npages; | |
948 | ||
949 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
950 | return; | |
951 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
952 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
953 | for (i = 0; i < npages; i++) { | |
954 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
955 | rqstp->rq_pages[i] = NULL; | |
956 | } | |
957 | } | |
958 | ||
959 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
960 | { | |
961 | unsigned int i, len, npages; | |
962 | ||
963 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) | |
964 | goto out; | |
965 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); | |
966 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
967 | for (i = 0; i < npages; i++) { | |
968 | BUG_ON(svsk->sk_pages[i] == NULL); | |
969 | put_page(svsk->sk_pages[i]); | |
970 | svsk->sk_pages[i] = NULL; | |
971 | } | |
972 | out: | |
973 | svsk->sk_tcplen = 0; | |
974 | } | |
975 | ||
1da177e4 | 976 | /* |
8f55f3c0 AB |
977 | * Receive data. |
978 | * If we haven't gotten the record length yet, get the next four bytes. | |
979 | * Otherwise try to gobble up as much as possible up to the complete | |
980 | * record length. | |
1da177e4 | 981 | */ |
8f55f3c0 | 982 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 983 | { |
bb5cf160 | 984 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 985 | unsigned int want; |
8f55f3c0 | 986 | int len; |
1da177e4 | 987 | |
02fc6c36 | 988 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 989 | |
c0401ea0 | 990 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
991 | struct kvec iov; |
992 | ||
5ee78d48 | 993 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
994 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
995 | iov.iov_len = want; | |
996 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
997 | goto error; | |
998 | svsk->sk_tcplen += len; | |
999 | ||
1000 | if (len < want) { | |
c0401ea0 CL |
1001 | dprintk("svc: short recvfrom while reading record " |
1002 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 1003 | return -EAGAIN; |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
c0401ea0 | 1007 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { |
1da177e4 LT |
1008 | /* FIXME: technically, a record can be fragmented, |
1009 | * and non-terminal fragments will not have the top | |
1010 | * bit set in the fragment length header. | |
1011 | * But apparently no known nfs clients send fragmented | |
1012 | * records. */ | |
34e9a63b | 1013 | if (net_ratelimit()) |
c0401ea0 CL |
1014 | printk(KERN_NOTICE "RPC: multiple fragments " |
1015 | "per record not supported\n"); | |
1da177e4 LT |
1016 | goto err_delete; |
1017 | } | |
8f55f3c0 | 1018 | |
c0401ea0 | 1019 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; |
1da177e4 | 1020 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); |
c6b0a9f8 | 1021 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b | 1022 | if (net_ratelimit()) |
c0401ea0 CL |
1023 | printk(KERN_NOTICE "RPC: " |
1024 | "fragment too large: 0x%08lx\n", | |
1025 | (unsigned long)svsk->sk_reclen); | |
1da177e4 LT |
1026 | goto err_delete; |
1027 | } | |
1028 | } | |
1029 | ||
cc6c2127 BF |
1030 | if (svsk->sk_reclen < 8) |
1031 | goto err_delete; /* client is nuts. */ | |
1032 | ||
1da177e4 | 1033 | len = svsk->sk_reclen; |
1da177e4 | 1034 | |
8f55f3c0 | 1035 | return len; |
31d68ef6 BF |
1036 | error: |
1037 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 1038 | return len; |
31d68ef6 | 1039 | err_delete: |
8f55f3c0 | 1040 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
1041 | return -EAGAIN; |
1042 | } | |
1043 | ||
586c52cc | 1044 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 1045 | { |
586c52cc | 1046 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 1047 | struct rpc_rqst *req = NULL; |
586c52cc TM |
1048 | struct kvec *src, *dst; |
1049 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
1050 | __be32 xid; |
1051 | __be32 calldir; | |
4cfc7e60 | 1052 | |
4cfc7e60 RI |
1053 | xid = *p++; |
1054 | calldir = *p; | |
1055 | ||
586c52cc TM |
1056 | if (bc_xprt) |
1057 | req = xprt_lookup_rqst(bc_xprt, xid); | |
4cfc7e60 | 1058 | |
586c52cc TM |
1059 | if (!req) { |
1060 | printk(KERN_NOTICE | |
1061 | "%s: Got unrecognized reply: " | |
1062 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1063 | __func__, ntohl(calldir), | |
1064 | bc_xprt, xid); | |
1065 | return -EAGAIN; | |
4cfc7e60 | 1066 | } |
586c52cc TM |
1067 | |
1068 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1069 | /* | |
1070 | * XXX!: cheating for now! Only copying HEAD. | |
1071 | * But we know this is good enough for now (in fact, for any | |
1072 | * callback reply in the forseeable future). | |
1073 | */ | |
1074 | dst = &req->rq_private_buf.head[0]; | |
1075 | src = &rqstp->rq_arg.head[0]; | |
1076 | if (dst->iov_len < src->iov_len) | |
1077 | return -EAGAIN; /* whatever; just giving up. */ | |
1078 | memcpy(dst->iov_base, src->iov_base, src->iov_len); | |
1079 | xprt_complete_rqst(req->rq_task, svsk->sk_reclen); | |
1080 | rqstp->rq_arg.len = 0; | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1085 | { | |
1086 | int i = 0; | |
1087 | int t = 0; | |
1088 | ||
1089 | while (t < len) { | |
1090 | vec[i].iov_base = page_address(pages[i]); | |
1091 | vec[i].iov_len = PAGE_SIZE; | |
1092 | i++; | |
1093 | t += PAGE_SIZE; | |
1094 | } | |
1095 | return i; | |
4cfc7e60 RI |
1096 | } |
1097 | ||
31d68ef6 | 1098 | |
8f55f3c0 AB |
1099 | /* |
1100 | * Receive data from a TCP socket. | |
1101 | */ | |
1102 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1103 | { | |
1104 | struct svc_sock *svsk = | |
1105 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1106 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1107 | int len; | |
1108 | struct kvec *vec; | |
31d68ef6 | 1109 | unsigned int want, base; |
586c52cc TM |
1110 | __be32 *p; |
1111 | __be32 calldir; | |
5ee78d48 | 1112 | int pnum; |
8f55f3c0 AB |
1113 | |
1114 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1115 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1116 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1117 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1118 | ||
1119 | len = svc_tcp_recv_record(svsk, rqstp); | |
1120 | if (len < 0) | |
1121 | goto error; | |
1122 | ||
31d68ef6 BF |
1123 | base = svc_tcp_restore_pages(svsk, rqstp); |
1124 | want = svsk->sk_reclen - base; | |
1125 | ||
3cc03b16 | 1126 | vec = rqstp->rq_vec; |
4cfc7e60 | 1127 | |
586c52cc TM |
1128 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
1129 | svsk->sk_reclen); | |
1130 | ||
44524359 | 1131 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
1132 | |
1133 | /* Now receive data */ | |
31d68ef6 BF |
1134 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
1135 | if (len >= 0) | |
1136 | svsk->sk_tcplen += len; | |
1137 | if (len != want) { | |
1138 | if (len < 0 && len != -EAGAIN) | |
1139 | goto err_other; | |
1140 | svc_tcp_save_pages(svsk, rqstp); | |
1141 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
1142 | svsk->sk_tcplen, svsk->sk_reclen); | |
1143 | goto err_noclose; | |
1144 | } | |
1da177e4 | 1145 | |
5ee78d48 | 1146 | rqstp->rq_arg.len = svsk->sk_reclen; |
1da177e4 | 1147 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1148 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1149 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1150 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1151 | } else |
1152 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1153 | |
5148bf4e | 1154 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
1155 | rqstp->rq_prot = IPPROTO_TCP; |
1156 | ||
586c52cc TM |
1157 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1158 | calldir = p[1]; | |
8985ef0b | 1159 | if (calldir) |
586c52cc | 1160 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1161 | |
1da177e4 LT |
1162 | /* Reset TCP read info */ |
1163 | svsk->sk_reclen = 0; | |
1164 | svsk->sk_tcplen = 0; | |
0601f793 TM |
1165 | /* If we have more data, signal svc_xprt_enqueue() to try again */ |
1166 | if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) | |
1167 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1168 | ||
8985ef0b BF |
1169 | if (len < 0) |
1170 | goto error; | |
1da177e4 | 1171 | |
9dbc240f | 1172 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1173 | if (serv->sv_stats) |
1174 | serv->sv_stats->nettcpcnt++; | |
1175 | ||
31d68ef6 | 1176 | dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); |
5ee78d48 | 1177 | return rqstp->rq_arg.len; |
1da177e4 | 1178 | |
8f55f3c0 | 1179 | error: |
31d68ef6 BF |
1180 | if (len != -EAGAIN) |
1181 | goto err_other; | |
1182 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
8f55f3c0 | 1183 | return -EAGAIN; |
31d68ef6 BF |
1184 | err_other: |
1185 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
1186 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1187 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1188 | err_noclose: | |
1189 | return -EAGAIN; /* record not complete */ | |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | /* | |
1193 | * Send out data on TCP socket. | |
1194 | */ | |
0f0257ea | 1195 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1196 | { |
1197 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1198 | int sent; | |
d8ed029d | 1199 | __be32 reclen; |
1da177e4 LT |
1200 | |
1201 | /* Set up the first element of the reply kvec. | |
1202 | * Any other kvecs that may be in use have been taken | |
1203 | * care of by the server implementation itself. | |
1204 | */ | |
1205 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1206 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1207 | ||
1da177e4 LT |
1208 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1209 | if (sent != xbufp->len) { | |
0f0257ea TT |
1210 | printk(KERN_NOTICE |
1211 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1212 | "- shutting down socket\n", | |
57b1d3ba | 1213 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1214 | (sent<0)?"got error":"sent only", |
1215 | sent, xbufp->len); | |
57b1d3ba | 1216 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1217 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1218 | sent = -EAGAIN; |
1219 | } | |
1220 | return sent; | |
1221 | } | |
1222 | ||
e831fe65 TT |
1223 | /* |
1224 | * Setup response header. TCP has a 4B record length field. | |
1225 | */ | |
1226 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1227 | { | |
1228 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1229 | ||
1230 | /* tcp needs a space for the record length... */ | |
1231 | svc_putnl(resv, 0); | |
1232 | } | |
1233 | ||
323bee32 TT |
1234 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
1235 | { | |
57b1d3ba | 1236 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
47fcb03f | 1237 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 | 1238 | int required; |
323bee32 | 1239 | |
47fcb03f TM |
1240 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
1241 | return 1; | |
1242 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
1243 | if (sk_stream_wspace(svsk->sk_sk) >= required) | |
1244 | return 1; | |
323bee32 | 1245 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
47fcb03f | 1246 | return 0; |
323bee32 TT |
1247 | } |
1248 | ||
b700cbb1 | 1249 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1250 | struct net *net, |
b700cbb1 TT |
1251 | struct sockaddr *sa, int salen, |
1252 | int flags) | |
1253 | { | |
62832c03 | 1254 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1255 | } |
1256 | ||
9e00abc3 | 1257 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1f11a034 AA |
1258 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
1259 | struct net *, struct sockaddr *, | |
1260 | int, int); | |
1261 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1262 | ||
1263 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1264 | struct net *net, | |
1265 | struct sockaddr *sa, int salen, | |
1266 | int flags) | |
1267 | { | |
1268 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1269 | } | |
1270 | ||
1271 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1272 | { | |
1273 | } | |
1274 | ||
1275 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1276 | .xpo_create = svc_bc_tcp_create, | |
1277 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1278 | .xpo_free = svc_bc_sock_free, | |
1279 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
1280 | }; | |
1281 | ||
1282 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1283 | .xcl_name = "tcp-bc", | |
1284 | .xcl_owner = THIS_MODULE, | |
1285 | .xcl_ops = &svc_tcp_bc_ops, | |
1286 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1287 | }; | |
16b2d1e1 AA |
1288 | |
1289 | static void svc_init_bc_xprt_sock(void) | |
1290 | { | |
1291 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1292 | } | |
1293 | ||
1294 | static void svc_cleanup_bc_xprt_sock(void) | |
1295 | { | |
1296 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1297 | } | |
9e00abc3 | 1298 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
16b2d1e1 AA |
1299 | static void svc_init_bc_xprt_sock(void) |
1300 | { | |
1301 | } | |
1302 | ||
1303 | static void svc_cleanup_bc_xprt_sock(void) | |
1304 | { | |
1305 | } | |
9e00abc3 | 1306 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1f11a034 | 1307 | |
360d8738 | 1308 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1309 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1310 | .xpo_recvfrom = svc_tcp_recvfrom, |
1311 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1312 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1313 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1314 | .xpo_free = svc_sock_free, |
e831fe65 | 1315 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1316 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1317 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1318 | }; |
1319 | ||
1320 | static struct svc_xprt_class svc_tcp_class = { | |
1321 | .xcl_name = "tcp", | |
b700cbb1 | 1322 | .xcl_owner = THIS_MODULE, |
360d8738 | 1323 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1324 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1325 | }; |
1326 | ||
1327 | void svc_init_xprt_sock(void) | |
1328 | { | |
1329 | svc_reg_xprt_class(&svc_tcp_class); | |
1330 | svc_reg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1331 | svc_init_bc_xprt_sock(); |
360d8738 TT |
1332 | } |
1333 | ||
1334 | void svc_cleanup_xprt_sock(void) | |
1335 | { | |
1336 | svc_unreg_xprt_class(&svc_tcp_class); | |
1337 | svc_unreg_xprt_class(&svc_udp_class); | |
16b2d1e1 | 1338 | svc_cleanup_bc_xprt_sock(); |
360d8738 TT |
1339 | } |
1340 | ||
bb5cf160 | 1341 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1342 | { |
1343 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1344 | |
bb5cf160 | 1345 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); |
def13d74 | 1346 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1347 | if (sk->sk_state == TCP_LISTEN) { |
1348 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1349 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1350 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1351 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1352 | } else { |
1353 | dprintk("setting up TCP socket for reading\n"); | |
1354 | sk->sk_state_change = svc_tcp_state_change; | |
1355 | sk->sk_data_ready = svc_tcp_data_ready; | |
47fcb03f | 1356 | sk->sk_write_space = svc_tcp_write_space; |
1da177e4 LT |
1357 | |
1358 | svsk->sk_reclen = 0; | |
1359 | svsk->sk_tcplen = 0; | |
31d68ef6 | 1360 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1361 | |
b7872fe8 | 1362 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1363 | |
02fc6c36 | 1364 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1365 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1366 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1367 | } |
1368 | } | |
1369 | ||
0f0257ea | 1370 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1371 | { |
1372 | /* | |
1373 | * The number of server threads has changed. Update | |
1374 | * rcvbuf and sndbuf accordingly on all sockets | |
1375 | */ | |
8f3a6de3 | 1376 | struct svc_sock *svsk; |
1da177e4 LT |
1377 | |
1378 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1379 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1380 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
8f3a6de3 | 1381 | list_for_each_entry(svsk, &serv->sv_tempsocks, sk_xprt.xpt_list) |
02fc6c36 | 1382 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1383 | spin_unlock_bh(&serv->sv_lock); |
1384 | } | |
24c3767e | 1385 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1386 | |
1da177e4 LT |
1387 | /* |
1388 | * Initialize socket for RPC use and create svc_sock struct | |
1389 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1390 | */ | |
6b174337 CL |
1391 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1392 | struct socket *sock, | |
1393 | int *errp, int flags) | |
1da177e4 LT |
1394 | { |
1395 | struct svc_sock *svsk; | |
1396 | struct sock *inet; | |
6b174337 | 1397 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 LT |
1398 | |
1399 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1400 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1401 | *errp = -ENOMEM; |
1402 | return NULL; | |
1403 | } | |
1da177e4 LT |
1404 | |
1405 | inet = sock->sk; | |
1406 | ||
1407 | /* Register socket with portmapper */ | |
1408 | if (*errp >= 0 && pmap_register) | |
baf01caf | 1409 | *errp = svc_register(serv, inet->sk_family, inet->sk_protocol, |
c720c7e8 | 1410 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 LT |
1411 | |
1412 | if (*errp < 0) { | |
1413 | kfree(svsk); | |
1414 | return NULL; | |
1415 | } | |
1416 | ||
1da177e4 LT |
1417 | inet->sk_user_data = svsk; |
1418 | svsk->sk_sock = sock; | |
1419 | svsk->sk_sk = inet; | |
1420 | svsk->sk_ostate = inet->sk_state_change; | |
1421 | svsk->sk_odata = inet->sk_data_ready; | |
1422 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1423 | |
1424 | /* Initialize the socket */ | |
1425 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1426 | svc_udp_init(svsk, serv); |
96604398 OK |
1427 | else { |
1428 | /* initialise setting must have enough space to | |
1429 | * receive and respond to one request. | |
1430 | */ | |
1431 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1432 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1433 | svc_tcp_init(svsk, serv); |
96604398 | 1434 | } |
1da177e4 | 1435 | |
1da177e4 LT |
1436 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1437 | svsk, svsk->sk_sk); | |
1438 | ||
1da177e4 LT |
1439 | return svsk; |
1440 | } | |
1441 | ||
bfba9ab4 CL |
1442 | /** |
1443 | * svc_addsock - add a listener socket to an RPC service | |
1444 | * @serv: pointer to RPC service to which to add a new listener | |
1445 | * @fd: file descriptor of the new listener | |
1446 | * @name_return: pointer to buffer to fill in with name of listener | |
1447 | * @len: size of the buffer | |
1448 | * | |
1449 | * Fills in socket name and returns positive length of name if successful. | |
1450 | * Name is terminated with '\n'. On error, returns a negative errno | |
1451 | * value. | |
1452 | */ | |
1453 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1454 | const size_t len) | |
b41b66d6 N |
1455 | { |
1456 | int err = 0; | |
1457 | struct socket *so = sockfd_lookup(fd, &err); | |
1458 | struct svc_sock *svsk = NULL; | |
1459 | ||
1460 | if (!so) | |
1461 | return err; | |
205ba423 | 1462 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
b41b66d6 N |
1463 | err = -EAFNOSUPPORT; |
1464 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1465 | so->sk->sk_protocol != IPPROTO_UDP) | |
1466 | err = -EPROTONOSUPPORT; | |
1467 | else if (so->state > SS_UNCONNECTED) | |
1468 | err = -EISCONN; | |
1469 | else { | |
2da2c21d TT |
1470 | if (!try_module_get(THIS_MODULE)) |
1471 | err = -ENOENT; | |
1472 | else | |
1473 | svsk = svc_setup_socket(serv, so, &err, | |
1474 | SVC_SOCK_DEFAULTS); | |
e79eff1f | 1475 | if (svsk) { |
9dbc240f TT |
1476 | struct sockaddr_storage addr; |
1477 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1478 | int salen; | |
1479 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1480 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
4e5caaa5 TT |
1481 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
1482 | spin_lock_bh(&serv->sv_lock); | |
1483 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1484 | spin_unlock_bh(&serv->sv_lock); | |
a6046f71 | 1485 | svc_xprt_received(&svsk->sk_xprt); |
b41b66d6 | 1486 | err = 0; |
2da2c21d TT |
1487 | } else |
1488 | module_put(THIS_MODULE); | |
b41b66d6 N |
1489 | } |
1490 | if (err) { | |
1491 | sockfd_put(so); | |
1492 | return err; | |
1493 | } | |
e7942b9f | 1494 | return svc_one_sock_name(svsk, name_return, len); |
b41b66d6 N |
1495 | } |
1496 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1497 | ||
1da177e4 LT |
1498 | /* |
1499 | * Create socket for RPC service. | |
1500 | */ | |
b700cbb1 TT |
1501 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1502 | int protocol, | |
62832c03 | 1503 | struct net *net, |
b700cbb1 TT |
1504 | struct sockaddr *sin, int len, |
1505 | int flags) | |
1da177e4 LT |
1506 | { |
1507 | struct svc_sock *svsk; | |
1508 | struct socket *sock; | |
1509 | int error; | |
1510 | int type; | |
9dbc240f TT |
1511 | struct sockaddr_storage addr; |
1512 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1513 | int newlen; | |
c69da774 TM |
1514 | int family; |
1515 | int val; | |
5216a8e7 | 1516 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1517 | |
ad06e4bd CL |
1518 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1519 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1520 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1521 | |
1522 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1523 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1524 | "sockets supported\n"); | |
b700cbb1 | 1525 | return ERR_PTR(-EINVAL); |
1da177e4 | 1526 | } |
c69da774 | 1527 | |
1da177e4 | 1528 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1529 | switch (sin->sa_family) { |
1530 | case AF_INET6: | |
1531 | family = PF_INET6; | |
1532 | break; | |
1533 | case AF_INET: | |
1534 | family = PF_INET; | |
1535 | break; | |
1536 | default: | |
1537 | return ERR_PTR(-EINVAL); | |
1538 | } | |
1da177e4 | 1539 | |
14ec63c3 | 1540 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1541 | if (error < 0) |
b700cbb1 | 1542 | return ERR_PTR(error); |
1da177e4 | 1543 | |
ed07536e PZ |
1544 | svc_reclassify_socket(sock); |
1545 | ||
c69da774 TM |
1546 | /* |
1547 | * If this is an PF_INET6 listener, we want to avoid | |
1548 | * getting requests from IPv4 remotes. Those should | |
1549 | * be shunted to a PF_INET listener via rpcbind. | |
1550 | */ | |
1551 | val = 1; | |
1552 | if (family == PF_INET6) | |
1553 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1554 | (char *)&val, sizeof(val)); | |
1555 | ||
18114746 | 1556 | if (type == SOCK_STREAM) |
77f1f67a CL |
1557 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
1558 | error = kernel_bind(sock, sin, len); | |
18114746 ES |
1559 | if (error < 0) |
1560 | goto bummer; | |
1da177e4 | 1561 | |
9dbc240f TT |
1562 | newlen = len; |
1563 | error = kernel_getsockname(sock, newsin, &newlen); | |
1564 | if (error < 0) | |
1565 | goto bummer; | |
1566 | ||
1da177e4 | 1567 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1568 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1569 | goto bummer; |
1570 | } | |
1571 | ||
e79eff1f | 1572 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
9dbc240f | 1573 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
b700cbb1 | 1574 | return (struct svc_xprt *)svsk; |
e79eff1f | 1575 | } |
1da177e4 LT |
1576 | |
1577 | bummer: | |
1578 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1579 | sock_release(sock); | |
b700cbb1 | 1580 | return ERR_PTR(error); |
1da177e4 LT |
1581 | } |
1582 | ||
755cceab TT |
1583 | /* |
1584 | * Detach the svc_sock from the socket so that no | |
1585 | * more callbacks occur. | |
1586 | */ | |
1587 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1588 | { | |
1589 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1590 | struct sock *sk = svsk->sk_sk; | |
eaefd110 | 1591 | wait_queue_head_t *wq; |
755cceab TT |
1592 | |
1593 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1594 | ||
1595 | /* put back the old socket callbacks */ | |
1596 | sk->sk_state_change = svsk->sk_ostate; | |
1597 | sk->sk_data_ready = svsk->sk_odata; | |
1598 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 | 1599 | |
eaefd110 ED |
1600 | wq = sk_sleep(sk); |
1601 | if (wq && waitqueue_active(wq)) | |
1602 | wake_up_interruptible(wq); | |
69b6ba37 TM |
1603 | } |
1604 | ||
1605 | /* | |
1606 | * Disconnect the socket, and reset the callbacks | |
1607 | */ | |
1608 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1609 | { | |
1610 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1611 | ||
1612 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1613 | ||
1614 | svc_sock_detach(xprt); | |
1615 | ||
31d68ef6 BF |
1616 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1617 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1618 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1619 | } |
755cceab TT |
1620 | } |
1621 | ||
1622 | /* | |
1623 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1624 | */ | |
1625 | static void svc_sock_free(struct svc_xprt *xprt) | |
1626 | { | |
1627 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1628 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1629 | ||
755cceab TT |
1630 | if (svsk->sk_sock->file) |
1631 | sockfd_put(svsk->sk_sock); | |
1632 | else | |
1633 | sock_release(svsk->sk_sock); | |
1634 | kfree(svsk); | |
1635 | } | |
7652e5a0 | 1636 | |
9e00abc3 | 1637 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
7652e5a0 | 1638 | /* |
1f11a034 | 1639 | * Create a back channel svc_xprt which shares the fore channel socket. |
7652e5a0 | 1640 | */ |
1f11a034 AA |
1641 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
1642 | int protocol, | |
1643 | struct net *net, | |
1644 | struct sockaddr *sin, int len, | |
1645 | int flags) | |
7652e5a0 BH |
1646 | { |
1647 | struct svc_sock *svsk; | |
1f11a034 AA |
1648 | struct svc_xprt *xprt; |
1649 | ||
1650 | if (protocol != IPPROTO_TCP) { | |
1651 | printk(KERN_WARNING "svc: only TCP sockets" | |
1652 | " supported on shared back channel\n"); | |
1653 | return ERR_PTR(-EINVAL); | |
1654 | } | |
7652e5a0 | 1655 | |
7652e5a0 BH |
1656 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1657 | if (!svsk) | |
1f11a034 | 1658 | return ERR_PTR(-ENOMEM); |
7652e5a0 BH |
1659 | |
1660 | xprt = &svsk->sk_xprt; | |
1f11a034 AA |
1661 | svc_xprt_init(&svc_tcp_bc_class, xprt, serv); |
1662 | ||
4a19de0f | 1663 | serv->sv_bc_xprt = xprt; |
1f11a034 | 1664 | |
7652e5a0 BH |
1665 | return xprt; |
1666 | } | |
7652e5a0 BH |
1667 | |
1668 | /* | |
1f11a034 | 1669 | * Free a back channel svc_sock. |
7652e5a0 | 1670 | */ |
1f11a034 | 1671 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
7652e5a0 | 1672 | { |
778be232 | 1673 | if (xprt) |
7652e5a0 BH |
1674 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
1675 | } | |
9e00abc3 | 1676 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |