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> | |
52 | ||
360d8738 | 53 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
54 | |
55 | ||
56 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 57 | int *errp, int flags); |
1da177e4 LT |
58 | static void svc_udp_data_ready(struct sock *, int); |
59 | static int svc_udp_recvfrom(struct svc_rqst *); | |
60 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 61 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 62 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 63 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 64 | |
b700cbb1 TT |
65 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
66 | struct sockaddr *, int, int); | |
ed07536e PZ |
67 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
68 | static struct lock_class_key svc_key[2]; | |
69 | static struct lock_class_key svc_slock_key[2]; | |
70 | ||
0f0257ea | 71 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
72 | { |
73 | struct sock *sk = sock->sk; | |
02b3d346 | 74 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
75 | switch (sk->sk_family) { |
76 | case AF_INET: | |
77 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
78 | &svc_slock_key[0], |
79 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
80 | &svc_key[0]); | |
ed07536e PZ |
81 | break; |
82 | ||
83 | case AF_INET6: | |
84 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
85 | &svc_slock_key[1], |
86 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
87 | &svc_key[1]); | |
ed07536e PZ |
88 | break; |
89 | ||
90 | default: | |
91 | BUG(); | |
92 | } | |
93 | } | |
94 | #else | |
0f0257ea | 95 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
96 | { |
97 | } | |
98 | #endif | |
99 | ||
1da177e4 LT |
100 | /* |
101 | * Release an skbuff after use | |
102 | */ | |
5148bf4e | 103 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 104 | { |
5148bf4e | 105 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
106 | |
107 | if (skb) { | |
57b1d3ba TT |
108 | struct svc_sock *svsk = |
109 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 110 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
111 | |
112 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
57b1d3ba | 113 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 | 114 | } |
1da177e4 LT |
115 | } |
116 | ||
b92503b2 CL |
117 | union svc_pktinfo_u { |
118 | struct in_pktinfo pkti; | |
b92503b2 | 119 | struct in6_pktinfo pkti6; |
b92503b2 | 120 | }; |
bc375ea7 DM |
121 | #define SVC_PKTINFO_SPACE \ |
122 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
123 | |
124 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
125 | { | |
57b1d3ba TT |
126 | struct svc_sock *svsk = |
127 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
128 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
129 | case AF_INET: { |
130 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
131 | ||
132 | cmh->cmsg_level = SOL_IP; | |
133 | cmh->cmsg_type = IP_PKTINFO; | |
134 | pki->ipi_ifindex = 0; | |
135 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
136 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
137 | } | |
138 | break; | |
5a05ed73 | 139 | |
b92503b2 CL |
140 | case AF_INET6: { |
141 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
142 | ||
143 | cmh->cmsg_level = SOL_IPV6; | |
144 | cmh->cmsg_type = IPV6_PKTINFO; | |
145 | pki->ipi6_ifindex = 0; | |
146 | ipv6_addr_copy(&pki->ipi6_addr, | |
147 | &rqstp->rq_daddr.addr6); | |
148 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
149 | } | |
150 | break; | |
b92503b2 CL |
151 | } |
152 | return; | |
153 | } | |
154 | ||
1da177e4 LT |
155 | /* |
156 | * Generic sendto routine | |
157 | */ | |
0f0257ea | 158 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) |
1da177e4 | 159 | { |
57b1d3ba TT |
160 | struct svc_sock *svsk = |
161 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1da177e4 LT |
162 | struct socket *sock = svsk->sk_sock; |
163 | int slen; | |
bc375ea7 DM |
164 | union { |
165 | struct cmsghdr hdr; | |
166 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
167 | } buffer; | |
168 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 LT |
169 | int len = 0; |
170 | int result; | |
171 | int size; | |
172 | struct page **ppage = xdr->pages; | |
173 | size_t base = xdr->page_base; | |
174 | unsigned int pglen = xdr->page_len; | |
175 | unsigned int flags = MSG_MORE; | |
5216a8e7 | 176 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
177 | |
178 | slen = xdr->len; | |
179 | ||
180 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
b92503b2 CL |
181 | struct msghdr msg = { |
182 | .msg_name = &rqstp->rq_addr, | |
183 | .msg_namelen = rqstp->rq_addrlen, | |
184 | .msg_control = cmh, | |
185 | .msg_controllen = sizeof(buffer), | |
186 | .msg_flags = MSG_MORE, | |
187 | }; | |
188 | ||
189 | svc_set_cmsg_data(rqstp, cmh); | |
1da177e4 LT |
190 | |
191 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
192 | goto out; | |
193 | } | |
194 | ||
195 | /* send head */ | |
196 | if (slen == xdr->head[0].iov_len) | |
197 | flags = 0; | |
44524359 N |
198 | len = kernel_sendpage(sock, rqstp->rq_respages[0], 0, |
199 | xdr->head[0].iov_len, flags); | |
1da177e4 LT |
200 | if (len != xdr->head[0].iov_len) |
201 | goto out; | |
202 | slen -= xdr->head[0].iov_len; | |
203 | if (slen == 0) | |
204 | goto out; | |
205 | ||
206 | /* send page data */ | |
207 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
208 | while (pglen > 0) { | |
209 | if (slen == size) | |
210 | flags = 0; | |
e6242e92 | 211 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
212 | if (result > 0) |
213 | len += result; | |
214 | if (result != size) | |
215 | goto out; | |
216 | slen -= size; | |
217 | pglen -= size; | |
218 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
219 | base = 0; | |
220 | ppage++; | |
221 | } | |
222 | /* send tail */ | |
223 | if (xdr->tail[0].iov_len) { | |
44524359 N |
224 | result = kernel_sendpage(sock, rqstp->rq_respages[0], |
225 | ((unsigned long)xdr->tail[0].iov_base) | |
cca5172a | 226 | & (PAGE_SIZE-1), |
1da177e4 LT |
227 | xdr->tail[0].iov_len, 0); |
228 | ||
229 | if (result > 0) | |
230 | len += result; | |
231 | } | |
232 | out: | |
ad06e4bd | 233 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 234 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 235 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
236 | |
237 | return len; | |
238 | } | |
239 | ||
80212d59 N |
240 | /* |
241 | * Report socket names for nfsdfs | |
242 | */ | |
243 | static int one_sock_name(char *buf, struct svc_sock *svsk) | |
244 | { | |
245 | int len; | |
246 | ||
247 | switch(svsk->sk_sk->sk_family) { | |
248 | case AF_INET: | |
21454aaa HH |
249 | len = sprintf(buf, "ipv4 %s %pI4 %d\n", |
250 | svsk->sk_sk->sk_protocol == IPPROTO_UDP ? | |
80212d59 | 251 | "udp" : "tcp", |
21454aaa | 252 | &inet_sk(svsk->sk_sk)->rcv_saddr, |
80212d59 N |
253 | inet_sk(svsk->sk_sk)->num); |
254 | break; | |
255 | default: | |
256 | len = sprintf(buf, "*unknown-%d*\n", | |
257 | svsk->sk_sk->sk_family); | |
258 | } | |
259 | return len; | |
260 | } | |
261 | ||
8435d34d CL |
262 | /** |
263 | * svc_sock_names - construct a list of listener names in a string | |
264 | * @serv: pointer to RPC service | |
265 | * @buf: pointer to a buffer to fill in with socket names | |
266 | * @buflen: size of the buffer to be filled | |
267 | * @toclose: pointer to '\0'-terminated C string containing the name | |
268 | * of a listener to be closed | |
269 | * | |
270 | * Fills in @buf with a '\n'-separated list of names of listener | |
271 | * sockets. If @toclose is not NULL, the socket named by @toclose | |
272 | * is closed, and is not included in the output list. | |
273 | * | |
274 | * Returns positive length of the socket name string, or a negative | |
275 | * errno value on error. | |
276 | */ | |
277 | int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen, | |
278 | const char *toclose) | |
80212d59 | 279 | { |
b41b66d6 | 280 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
281 | int len = 0; |
282 | ||
283 | if (!serv) | |
284 | return 0; | |
aaf68cfb | 285 | spin_lock_bh(&serv->sv_lock); |
7a182083 | 286 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
80212d59 | 287 | int onelen = one_sock_name(buf+len, svsk); |
b41b66d6 N |
288 | if (toclose && strcmp(toclose, buf+len) == 0) |
289 | closesk = svsk; | |
290 | else | |
291 | len += onelen; | |
80212d59 | 292 | } |
aaf68cfb | 293 | spin_unlock_bh(&serv->sv_lock); |
b41b66d6 | 294 | if (closesk) |
5680c446 N |
295 | /* Should unregister with portmap, but you cannot |
296 | * unregister just one protocol... | |
297 | */ | |
7a182083 | 298 | svc_close_xprt(&closesk->sk_xprt); |
37a03472 N |
299 | else if (toclose) |
300 | return -ENOENT; | |
80212d59 N |
301 | return len; |
302 | } | |
24c3767e | 303 | EXPORT_SYMBOL_GPL(svc_sock_names); |
80212d59 | 304 | |
1da177e4 LT |
305 | /* |
306 | * Check input queue length | |
307 | */ | |
0f0257ea | 308 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 309 | { |
1da177e4 LT |
310 | struct socket *sock = svsk->sk_sock; |
311 | int avail, err; | |
312 | ||
e6242e92 | 313 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
314 | |
315 | return (err >= 0)? avail : err; | |
316 | } | |
317 | ||
318 | /* | |
319 | * Generic recvfrom routine. | |
320 | */ | |
0f0257ea TT |
321 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
322 | int buflen) | |
1da177e4 | 323 | { |
57b1d3ba TT |
324 | struct svc_sock *svsk = |
325 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
326 | struct msghdr msg = { |
327 | .msg_flags = MSG_DONTWAIT, | |
328 | }; | |
329 | int len; | |
1da177e4 | 330 | |
260c1d12 TT |
331 | rqstp->rq_xprt_hlen = 0; |
332 | ||
1ba95105 CL |
333 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
334 | msg.msg_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 | ||
341 | /* | |
342 | * Set socket snd and rcv buffer lengths | |
343 | */ | |
0f0257ea TT |
344 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
345 | unsigned int rcv) | |
1da177e4 LT |
346 | { |
347 | #if 0 | |
348 | mm_segment_t oldfs; | |
349 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
350 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
351 | (char*)&snd, sizeof(snd)); | |
352 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
353 | (char*)&rcv, sizeof(rcv)); | |
354 | #else | |
355 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
356 | * which isn't acceptable. Until that is made conditional | |
357 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
358 | * DaveM said I could! | |
359 | */ | |
360 | lock_sock(sock->sk); | |
361 | sock->sk->sk_sndbuf = snd * 2; | |
362 | sock->sk->sk_rcvbuf = rcv * 2; | |
1da177e4 LT |
363 | release_sock(sock->sk); |
364 | #endif | |
365 | } | |
366 | /* | |
367 | * INET callback when data has been received on the socket. | |
368 | */ | |
0f0257ea | 369 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 370 | { |
939bb7ef | 371 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 372 | |
939bb7ef NB |
373 | if (svsk) { |
374 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
375 | svsk, sk, count, |
376 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
377 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 378 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 379 | } |
1da177e4 LT |
380 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
381 | wake_up_interruptible(sk->sk_sleep); | |
382 | } | |
383 | ||
384 | /* | |
385 | * INET callback when space is newly available on the socket. | |
386 | */ | |
0f0257ea | 387 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
388 | { |
389 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
390 | ||
391 | if (svsk) { | |
392 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 393 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 394 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
395 | } |
396 | ||
397 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) { | |
939bb7ef | 398 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 LT |
399 | svsk); |
400 | wake_up_interruptible(sk->sk_sleep); | |
401 | } | |
402 | } | |
403 | ||
9dbc240f TT |
404 | /* |
405 | * Copy the UDP datagram's destination address to the rqstp structure. | |
406 | * The 'destination' address in this case is the address to which the | |
407 | * peer sent the datagram, i.e. our local address. For multihomed | |
408 | * hosts, this can change from msg to msg. Note that only the IP | |
409 | * address changes, the port number should remain the same. | |
410 | */ | |
411 | static void svc_udp_get_dest_address(struct svc_rqst *rqstp, | |
412 | struct cmsghdr *cmh) | |
95756482 | 413 | { |
57b1d3ba TT |
414 | struct svc_sock *svsk = |
415 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
416 | switch (svsk->sk_sk->sk_family) { | |
95756482 | 417 | case AF_INET: { |
7a37f578 N |
418 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
419 | rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; | |
95756482 | 420 | break; |
7a37f578 | 421 | } |
95756482 | 422 | case AF_INET6: { |
7a37f578 N |
423 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
424 | ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); | |
95756482 | 425 | break; |
7a37f578 | 426 | } |
95756482 | 427 | } |
95756482 CL |
428 | } |
429 | ||
1da177e4 LT |
430 | /* |
431 | * Receive a datagram from a UDP socket. | |
432 | */ | |
0f0257ea | 433 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 434 | { |
57b1d3ba TT |
435 | struct svc_sock *svsk = |
436 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 437 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 438 | struct sk_buff *skb; |
bc375ea7 DM |
439 | union { |
440 | struct cmsghdr hdr; | |
441 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
442 | } buffer; | |
443 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
444 | struct msghdr msg = { |
445 | .msg_name = svc_addr(rqstp), | |
446 | .msg_control = cmh, | |
447 | .msg_controllen = sizeof(buffer), | |
448 | .msg_flags = MSG_DONTWAIT, | |
449 | }; | |
abc5c44d CL |
450 | size_t len; |
451 | int err; | |
1da177e4 | 452 | |
02fc6c36 | 453 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
454 | /* udp sockets need large rcvbuf as all pending |
455 | * requests are still in that buffer. sndbuf must | |
456 | * also be large enough that there is enough space | |
3262c816 GB |
457 | * for one reply per thread. We count all threads |
458 | * rather than threads in a particular pool, which | |
459 | * provides an upper bound on the number of threads | |
460 | * which will access the socket. | |
1da177e4 LT |
461 | */ |
462 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
463 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
464 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 465 | |
02fc6c36 | 466 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
467 | skb = NULL; |
468 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
469 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
470 | if (err >= 0) | |
471 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
472 | ||
473 | if (skb == NULL) { | |
474 | if (err != -EAGAIN) { | |
475 | /* possibly an icmp error */ | |
476 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 477 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 478 | } |
a6046f71 | 479 | svc_xprt_received(&svsk->sk_xprt); |
05ed690e | 480 | return -EAGAIN; |
1da177e4 | 481 | } |
9dbc240f | 482 | len = svc_addr_len(svc_addr(rqstp)); |
abc5c44d CL |
483 | if (len == 0) |
484 | return -EAFNOSUPPORT; | |
9dbc240f | 485 | rqstp->rq_addrlen = len; |
b7aa0bf7 ED |
486 | if (skb->tstamp.tv64 == 0) { |
487 | skb->tstamp = ktime_get_real(); | |
cca5172a | 488 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
489 | need that much accuracy */ |
490 | } | |
b7aa0bf7 | 491 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 492 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 LT |
493 | |
494 | /* | |
495 | * Maybe more packets - kick another thread ASAP. | |
496 | */ | |
a6046f71 | 497 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
498 | |
499 | len = skb->len - sizeof(struct udphdr); | |
500 | rqstp->rq_arg.len = len; | |
501 | ||
95756482 | 502 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 503 | |
7a37f578 N |
504 | if (cmh->cmsg_level != IPPROTO_IP || |
505 | cmh->cmsg_type != IP_PKTINFO) { | |
506 | if (net_ratelimit()) | |
507 | printk("rpcsvc: received unknown control message:" | |
508 | "%d/%d\n", | |
509 | cmh->cmsg_level, cmh->cmsg_type); | |
510 | skb_free_datagram(svsk->sk_sk, skb); | |
511 | return 0; | |
512 | } | |
513 | svc_udp_get_dest_address(rqstp, cmh); | |
1da177e4 LT |
514 | |
515 | if (skb_is_nonlinear(skb)) { | |
516 | /* we have to copy */ | |
517 | local_bh_disable(); | |
518 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
519 | local_bh_enable(); | |
520 | /* checksum error */ | |
521 | skb_free_datagram(svsk->sk_sk, skb); | |
522 | return 0; | |
523 | } | |
524 | local_bh_enable(); | |
cca5172a | 525 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
526 | } else { |
527 | /* we can use it in-place */ | |
0f0257ea TT |
528 | rqstp->rq_arg.head[0].iov_base = skb->data + |
529 | sizeof(struct udphdr); | |
1da177e4 | 530 | rqstp->rq_arg.head[0].iov_len = len; |
fb286bb2 HX |
531 | if (skb_checksum_complete(skb)) { |
532 | skb_free_datagram(svsk->sk_sk, skb); | |
533 | return 0; | |
1da177e4 | 534 | } |
5148bf4e | 535 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
536 | } |
537 | ||
538 | rqstp->rq_arg.page_base = 0; | |
539 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
540 | rqstp->rq_arg.head[0].iov_len = len; | |
541 | rqstp->rq_arg.page_len = 0; | |
44524359 | 542 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
543 | } else { |
544 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 545 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 546 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
547 | } |
548 | ||
549 | if (serv->sv_stats) | |
550 | serv->sv_stats->netudpcnt++; | |
551 | ||
552 | return len; | |
553 | } | |
554 | ||
555 | static int | |
556 | svc_udp_sendto(struct svc_rqst *rqstp) | |
557 | { | |
558 | int error; | |
559 | ||
560 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
561 | if (error == -ECONNREFUSED) | |
562 | /* ICMP error on earlier request. */ | |
563 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
564 | ||
565 | return error; | |
566 | } | |
567 | ||
e831fe65 TT |
568 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
569 | { | |
570 | } | |
571 | ||
323bee32 TT |
572 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
573 | { | |
574 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 575 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
576 | unsigned long required; |
577 | ||
578 | /* | |
579 | * Set the SOCK_NOSPACE flag before checking the available | |
580 | * sock space. | |
581 | */ | |
582 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 583 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
584 | if (required*2 > sock_wspace(svsk->sk_sk)) |
585 | return 0; | |
586 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
587 | return 1; | |
588 | } | |
589 | ||
38a417cc TT |
590 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
591 | { | |
592 | BUG(); | |
593 | return NULL; | |
594 | } | |
595 | ||
b700cbb1 TT |
596 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
597 | struct sockaddr *sa, int salen, | |
598 | int flags) | |
599 | { | |
600 | return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags); | |
601 | } | |
602 | ||
360d8738 | 603 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 604 | .xpo_create = svc_udp_create, |
5d137990 TT |
605 | .xpo_recvfrom = svc_udp_recvfrom, |
606 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 607 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
608 | .xpo_detach = svc_sock_detach, |
609 | .xpo_free = svc_sock_free, | |
e831fe65 | 610 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 611 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 612 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
613 | }; |
614 | ||
615 | static struct svc_xprt_class svc_udp_class = { | |
616 | .xcl_name = "udp", | |
b700cbb1 | 617 | .xcl_owner = THIS_MODULE, |
360d8738 | 618 | .xcl_ops = &svc_udp_ops, |
49023155 | 619 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
620 | }; |
621 | ||
bb5cf160 | 622 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 623 | { |
7a37f578 N |
624 | int one = 1; |
625 | mm_segment_t oldfs; | |
626 | ||
bb5cf160 | 627 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); |
def13d74 | 628 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
629 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
630 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
631 | |
632 | /* initialise setting must have enough space to | |
cca5172a | 633 | * receive and respond to one request. |
1da177e4 LT |
634 | * svc_udp_recvfrom will re-adjust if necessary |
635 | */ | |
636 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
637 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
638 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 639 | |
0f0257ea TT |
640 | /* data might have come in before data_ready set up */ |
641 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 642 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 N |
643 | |
644 | oldfs = get_fs(); | |
645 | set_fs(KERNEL_DS); | |
646 | /* make sure we get destination address info */ | |
647 | svsk->sk_sock->ops->setsockopt(svsk->sk_sock, IPPROTO_IP, IP_PKTINFO, | |
648 | (char __user *)&one, sizeof(one)); | |
649 | set_fs(oldfs); | |
1da177e4 LT |
650 | } |
651 | ||
652 | /* | |
653 | * A data_ready event on a listening socket means there's a connection | |
654 | * pending. Do not use state_change as a substitute for it. | |
655 | */ | |
0f0257ea | 656 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 657 | { |
939bb7ef | 658 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
659 | |
660 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 661 | sk, sk->sk_state); |
1da177e4 | 662 | |
939bb7ef NB |
663 | /* |
664 | * This callback may called twice when a new connection | |
665 | * is established as a child socket inherits everything | |
666 | * from a parent LISTEN socket. | |
667 | * 1) data_ready method of the parent socket will be called | |
668 | * when one of child sockets become ESTABLISHED. | |
669 | * 2) data_ready method of the child socket may be called | |
670 | * when it receives data before the socket is accepted. | |
671 | * In case of 2, we should ignore it silently. | |
672 | */ | |
673 | if (sk->sk_state == TCP_LISTEN) { | |
674 | if (svsk) { | |
02fc6c36 | 675 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 676 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
677 | } else |
678 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 679 | } |
939bb7ef | 680 | |
1da177e4 LT |
681 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
682 | wake_up_interruptible_all(sk->sk_sleep); | |
683 | } | |
684 | ||
685 | /* | |
686 | * A state change on a connected socket means it's dying or dead. | |
687 | */ | |
0f0257ea | 688 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 689 | { |
939bb7ef | 690 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
691 | |
692 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 693 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 694 | |
939bb7ef | 695 | if (!svsk) |
1da177e4 | 696 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 697 | else { |
02fc6c36 | 698 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 699 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 700 | } |
1da177e4 LT |
701 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
702 | wake_up_interruptible_all(sk->sk_sleep); | |
703 | } | |
704 | ||
0f0257ea | 705 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 706 | { |
939bb7ef | 707 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
708 | |
709 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
710 | sk, sk->sk_user_data); |
711 | if (svsk) { | |
02fc6c36 | 712 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 713 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 714 | } |
1da177e4 LT |
715 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
716 | wake_up_interruptible(sk->sk_sleep); | |
717 | } | |
718 | ||
719 | /* | |
720 | * Accept a TCP connection | |
721 | */ | |
38a417cc | 722 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 723 | { |
38a417cc | 724 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f AM |
725 | struct sockaddr_storage addr; |
726 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 727 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
728 | struct socket *sock = svsk->sk_sock; |
729 | struct socket *newsock; | |
1da177e4 LT |
730 | struct svc_sock *newsvsk; |
731 | int err, slen; | |
5216a8e7 | 732 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
733 | |
734 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
735 | if (!sock) | |
38a417cc | 736 | return NULL; |
1da177e4 | 737 | |
02fc6c36 | 738 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
739 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
740 | if (err < 0) { | |
1da177e4 LT |
741 | if (err == -ENOMEM) |
742 | printk(KERN_WARNING "%s: no more sockets!\n", | |
743 | serv->sv_name); | |
e6242e92 | 744 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
745 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
746 | serv->sv_name, -err); | |
38a417cc | 747 | return NULL; |
1da177e4 | 748 | } |
02fc6c36 | 749 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 750 | |
cdd88b9f | 751 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
752 | if (err < 0) { |
753 | if (net_ratelimit()) | |
754 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
755 | serv->sv_name, -err); | |
756 | goto failed; /* aborted connection or whatever */ | |
757 | } | |
758 | ||
759 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
760 | * hosts here, but when we get encryption, the IP of the host won't |
761 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 762 | */ |
cdd88b9f | 763 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 764 | dprintk(KERN_WARNING |
ad06e4bd | 765 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 766 | serv->sv_name, |
cdd88b9f | 767 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 768 | } |
ad06e4bd | 769 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 770 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
771 | |
772 | /* make sure that a write doesn't block forever when | |
773 | * low on memory | |
774 | */ | |
775 | newsock->sk->sk_sndtimeo = HZ*30; | |
776 | ||
6b174337 CL |
777 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
778 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 779 | goto failed; |
9dbc240f | 780 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
781 | err = kernel_getsockname(newsock, sin, &slen); |
782 | if (unlikely(err < 0)) { | |
783 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
784 | slen = offsetof(struct sockaddr, sa_data); | |
785 | } | |
9dbc240f | 786 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 787 | |
f9f3cc4f TT |
788 | if (serv->sv_stats) |
789 | serv->sv_stats->nettcpconn++; | |
790 | ||
791 | return &newsvsk->sk_xprt; | |
792 | ||
793 | failed: | |
794 | sock_release(newsock); | |
795 | return NULL; | |
796 | } | |
797 | ||
1da177e4 LT |
798 | /* |
799 | * Receive data from a TCP socket. | |
800 | */ | |
0f0257ea | 801 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 802 | { |
57b1d3ba TT |
803 | struct svc_sock *svsk = |
804 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 805 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 806 | int len; |
3cc03b16 | 807 | struct kvec *vec; |
1da177e4 LT |
808 | int pnum, vlen; |
809 | ||
810 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
02fc6c36 TT |
811 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), |
812 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
813 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1da177e4 | 814 | |
02fc6c36 | 815 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
816 | |
817 | /* Receive data. If we haven't got the record length yet, get | |
818 | * the next four bytes. Otherwise try to gobble up as much as | |
819 | * possible up to the complete record length. | |
820 | */ | |
c0401ea0 CL |
821 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
822 | int want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; | |
1da177e4 LT |
823 | struct kvec iov; |
824 | ||
825 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; | |
826 | iov.iov_len = want; | |
827 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
828 | goto error; | |
829 | svsk->sk_tcplen += len; | |
830 | ||
831 | if (len < want) { | |
c0401ea0 CL |
832 | dprintk("svc: short recvfrom while reading record " |
833 | "length (%d of %d)\n", len, want); | |
a6046f71 | 834 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
835 | return -EAGAIN; /* record header not complete */ |
836 | } | |
837 | ||
838 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
c0401ea0 | 839 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { |
1da177e4 LT |
840 | /* FIXME: technically, a record can be fragmented, |
841 | * and non-terminal fragments will not have the top | |
842 | * bit set in the fragment length header. | |
843 | * But apparently no known nfs clients send fragmented | |
844 | * records. */ | |
34e9a63b | 845 | if (net_ratelimit()) |
c0401ea0 CL |
846 | printk(KERN_NOTICE "RPC: multiple fragments " |
847 | "per record not supported\n"); | |
1da177e4 LT |
848 | goto err_delete; |
849 | } | |
c0401ea0 | 850 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; |
1da177e4 | 851 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); |
c6b0a9f8 | 852 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b | 853 | if (net_ratelimit()) |
c0401ea0 CL |
854 | printk(KERN_NOTICE "RPC: " |
855 | "fragment too large: 0x%08lx\n", | |
856 | (unsigned long)svsk->sk_reclen); | |
1da177e4 LT |
857 | goto err_delete; |
858 | } | |
859 | } | |
860 | ||
861 | /* Check whether enough data is available */ | |
862 | len = svc_recv_available(svsk); | |
863 | if (len < 0) | |
864 | goto error; | |
865 | ||
866 | if (len < svsk->sk_reclen) { | |
867 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
868 | len, svsk->sk_reclen); | |
a6046f71 | 869 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
870 | return -EAGAIN; /* record not complete */ |
871 | } | |
872 | len = svsk->sk_reclen; | |
02fc6c36 | 873 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 874 | |
3cc03b16 | 875 | vec = rqstp->rq_vec; |
1da177e4 LT |
876 | vec[0] = rqstp->rq_arg.head[0]; |
877 | vlen = PAGE_SIZE; | |
878 | pnum = 1; | |
879 | while (vlen < len) { | |
44524359 | 880 | vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]); |
1da177e4 LT |
881 | vec[pnum].iov_len = PAGE_SIZE; |
882 | pnum++; | |
883 | vlen += PAGE_SIZE; | |
884 | } | |
44524359 | 885 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
886 | |
887 | /* Now receive data */ | |
888 | len = svc_recvfrom(rqstp, vec, pnum, len); | |
889 | if (len < 0) | |
890 | goto error; | |
891 | ||
892 | dprintk("svc: TCP complete record (%d bytes)\n", len); | |
893 | rqstp->rq_arg.len = len; | |
894 | rqstp->rq_arg.page_base = 0; | |
895 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
896 | rqstp->rq_arg.head[0].iov_len = len; | |
897 | rqstp->rq_arg.page_len = 0; | |
898 | } else { | |
899 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
900 | } | |
901 | ||
5148bf4e | 902 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
903 | rqstp->rq_prot = IPPROTO_TCP; |
904 | ||
905 | /* Reset TCP read info */ | |
906 | svsk->sk_reclen = 0; | |
907 | svsk->sk_tcplen = 0; | |
908 | ||
9dbc240f | 909 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
a6046f71 | 910 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
911 | if (serv->sv_stats) |
912 | serv->sv_stats->nettcpcnt++; | |
913 | ||
914 | return len; | |
915 | ||
916 | err_delete: | |
02fc6c36 | 917 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
918 | return -EAGAIN; |
919 | ||
920 | error: | |
921 | if (len == -EAGAIN) { | |
922 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
a6046f71 | 923 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
924 | } else { |
925 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
bb5cf160 | 926 | svsk->sk_xprt.xpt_server->sv_name, -len); |
93fbf1a5 | 927 | goto err_delete; |
1da177e4 LT |
928 | } |
929 | ||
930 | return len; | |
931 | } | |
932 | ||
933 | /* | |
934 | * Send out data on TCP socket. | |
935 | */ | |
0f0257ea | 936 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
937 | { |
938 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
939 | int sent; | |
d8ed029d | 940 | __be32 reclen; |
1da177e4 LT |
941 | |
942 | /* Set up the first element of the reply kvec. | |
943 | * Any other kvecs that may be in use have been taken | |
944 | * care of by the server implementation itself. | |
945 | */ | |
946 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
947 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
948 | ||
57b1d3ba | 949 | if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags)) |
1da177e4 LT |
950 | return -ENOTCONN; |
951 | ||
952 | sent = svc_sendto(rqstp, &rqstp->rq_res); | |
953 | if (sent != xbufp->len) { | |
0f0257ea TT |
954 | printk(KERN_NOTICE |
955 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
956 | "- shutting down socket\n", | |
57b1d3ba | 957 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
958 | (sent<0)?"got error":"sent only", |
959 | sent, xbufp->len); | |
57b1d3ba | 960 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 961 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
962 | sent = -EAGAIN; |
963 | } | |
964 | return sent; | |
965 | } | |
966 | ||
e831fe65 TT |
967 | /* |
968 | * Setup response header. TCP has a 4B record length field. | |
969 | */ | |
970 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
971 | { | |
972 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
973 | ||
974 | /* tcp needs a space for the record length... */ | |
975 | svc_putnl(resv, 0); | |
976 | } | |
977 | ||
323bee32 TT |
978 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
979 | { | |
57b1d3ba | 980 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
bb5cf160 | 981 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 TT |
982 | int required; |
983 | int wspace; | |
984 | ||
985 | /* | |
986 | * Set the SOCK_NOSPACE flag before checking the available | |
987 | * sock space. | |
988 | */ | |
989 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 990 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
991 | wspace = sk_stream_wspace(svsk->sk_sk); |
992 | ||
993 | if (wspace < sk_stream_min_wspace(svsk->sk_sk)) | |
994 | return 0; | |
995 | if (required * 2 > wspace) | |
996 | return 0; | |
997 | ||
998 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
999 | return 1; | |
1000 | } | |
1001 | ||
b700cbb1 TT |
1002 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
1003 | struct sockaddr *sa, int salen, | |
1004 | int flags) | |
1005 | { | |
1006 | return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags); | |
1007 | } | |
1008 | ||
360d8738 | 1009 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1010 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1011 | .xpo_recvfrom = svc_tcp_recvfrom, |
1012 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1013 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1014 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1015 | .xpo_free = svc_sock_free, |
e831fe65 | 1016 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1017 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1018 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1019 | }; |
1020 | ||
1021 | static struct svc_xprt_class svc_tcp_class = { | |
1022 | .xcl_name = "tcp", | |
b700cbb1 | 1023 | .xcl_owner = THIS_MODULE, |
360d8738 | 1024 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1025 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1026 | }; |
1027 | ||
1028 | void svc_init_xprt_sock(void) | |
1029 | { | |
1030 | svc_reg_xprt_class(&svc_tcp_class); | |
1031 | svc_reg_xprt_class(&svc_udp_class); | |
1032 | } | |
1033 | ||
1034 | void svc_cleanup_xprt_sock(void) | |
1035 | { | |
1036 | svc_unreg_xprt_class(&svc_tcp_class); | |
1037 | svc_unreg_xprt_class(&svc_udp_class); | |
1038 | } | |
1039 | ||
bb5cf160 | 1040 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1041 | { |
1042 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1043 | |
bb5cf160 | 1044 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); |
def13d74 | 1045 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1046 | if (sk->sk_state == TCP_LISTEN) { |
1047 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1048 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1049 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1050 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1051 | } else { |
1052 | dprintk("setting up TCP socket for reading\n"); | |
1053 | sk->sk_state_change = svc_tcp_state_change; | |
1054 | sk->sk_data_ready = svc_tcp_data_ready; | |
1055 | sk->sk_write_space = svc_write_space; | |
1056 | ||
1057 | svsk->sk_reclen = 0; | |
1058 | svsk->sk_tcplen = 0; | |
1059 | ||
b7872fe8 | 1060 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1061 | |
02fc6c36 | 1062 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
cca5172a | 1063 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1064 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1065 | } |
1066 | } | |
1067 | ||
0f0257ea | 1068 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1069 | { |
1070 | /* | |
1071 | * The number of server threads has changed. Update | |
1072 | * rcvbuf and sndbuf accordingly on all sockets | |
1073 | */ | |
1074 | struct list_head *le; | |
1075 | ||
1076 | spin_lock_bh(&serv->sv_lock); | |
1077 | list_for_each(le, &serv->sv_permsocks) { | |
cca5172a | 1078 | struct svc_sock *svsk = |
7a182083 | 1079 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1080 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1081 | } |
1082 | list_for_each(le, &serv->sv_tempsocks) { | |
1083 | struct svc_sock *svsk = | |
7a182083 | 1084 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1085 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1086 | } |
1087 | spin_unlock_bh(&serv->sv_lock); | |
1088 | } | |
24c3767e | 1089 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1090 | |
1da177e4 LT |
1091 | /* |
1092 | * Initialize socket for RPC use and create svc_sock struct | |
1093 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1094 | */ | |
6b174337 CL |
1095 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1096 | struct socket *sock, | |
1097 | int *errp, int flags) | |
1da177e4 LT |
1098 | { |
1099 | struct svc_sock *svsk; | |
1100 | struct sock *inet; | |
6b174337 | 1101 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 LT |
1102 | |
1103 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1104 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1105 | *errp = -ENOMEM; |
1106 | return NULL; | |
1107 | } | |
1da177e4 LT |
1108 | |
1109 | inet = sock->sk; | |
1110 | ||
1111 | /* Register socket with portmapper */ | |
1112 | if (*errp >= 0 && pmap_register) | |
baf01caf | 1113 | *errp = svc_register(serv, inet->sk_family, inet->sk_protocol, |
1da177e4 LT |
1114 | ntohs(inet_sk(inet)->sport)); |
1115 | ||
1116 | if (*errp < 0) { | |
1117 | kfree(svsk); | |
1118 | return NULL; | |
1119 | } | |
1120 | ||
1da177e4 LT |
1121 | inet->sk_user_data = svsk; |
1122 | svsk->sk_sock = sock; | |
1123 | svsk->sk_sk = inet; | |
1124 | svsk->sk_ostate = inet->sk_state_change; | |
1125 | svsk->sk_odata = inet->sk_data_ready; | |
1126 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1127 | |
1128 | /* Initialize the socket */ | |
1129 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1130 | svc_udp_init(svsk, serv); |
47a14ef1 OK |
1131 | else { |
1132 | /* initialise setting must have enough space to | |
1133 | * receive and respond to one request. | |
1134 | */ | |
1135 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, | |
1136 | 4 * serv->sv_max_mesg); | |
bb5cf160 | 1137 | svc_tcp_init(svsk, serv); |
47a14ef1 | 1138 | } |
1da177e4 | 1139 | |
1da177e4 LT |
1140 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1141 | svsk, svsk->sk_sk); | |
1142 | ||
1da177e4 LT |
1143 | return svsk; |
1144 | } | |
1145 | ||
bfba9ab4 CL |
1146 | /** |
1147 | * svc_addsock - add a listener socket to an RPC service | |
1148 | * @serv: pointer to RPC service to which to add a new listener | |
1149 | * @fd: file descriptor of the new listener | |
1150 | * @name_return: pointer to buffer to fill in with name of listener | |
1151 | * @len: size of the buffer | |
1152 | * | |
1153 | * Fills in socket name and returns positive length of name if successful. | |
1154 | * Name is terminated with '\n'. On error, returns a negative errno | |
1155 | * value. | |
1156 | */ | |
1157 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1158 | const size_t len) | |
b41b66d6 N |
1159 | { |
1160 | int err = 0; | |
1161 | struct socket *so = sockfd_lookup(fd, &err); | |
1162 | struct svc_sock *svsk = NULL; | |
1163 | ||
1164 | if (!so) | |
1165 | return err; | |
1166 | if (so->sk->sk_family != AF_INET) | |
1167 | err = -EAFNOSUPPORT; | |
1168 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1169 | so->sk->sk_protocol != IPPROTO_UDP) | |
1170 | err = -EPROTONOSUPPORT; | |
1171 | else if (so->state > SS_UNCONNECTED) | |
1172 | err = -EISCONN; | |
1173 | else { | |
2da2c21d TT |
1174 | if (!try_module_get(THIS_MODULE)) |
1175 | err = -ENOENT; | |
1176 | else | |
1177 | svsk = svc_setup_socket(serv, so, &err, | |
1178 | SVC_SOCK_DEFAULTS); | |
e79eff1f | 1179 | if (svsk) { |
9dbc240f TT |
1180 | struct sockaddr_storage addr; |
1181 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1182 | int salen; | |
1183 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1184 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
4e5caaa5 TT |
1185 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
1186 | spin_lock_bh(&serv->sv_lock); | |
1187 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1188 | spin_unlock_bh(&serv->sv_lock); | |
a6046f71 | 1189 | svc_xprt_received(&svsk->sk_xprt); |
b41b66d6 | 1190 | err = 0; |
2da2c21d TT |
1191 | } else |
1192 | module_put(THIS_MODULE); | |
b41b66d6 N |
1193 | } |
1194 | if (err) { | |
1195 | sockfd_put(so); | |
1196 | return err; | |
1197 | } | |
b41b66d6 N |
1198 | return one_sock_name(name_return, svsk); |
1199 | } | |
1200 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1201 | ||
1da177e4 LT |
1202 | /* |
1203 | * Create socket for RPC service. | |
1204 | */ | |
b700cbb1 TT |
1205 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1206 | int protocol, | |
1207 | struct sockaddr *sin, int len, | |
1208 | int flags) | |
1da177e4 LT |
1209 | { |
1210 | struct svc_sock *svsk; | |
1211 | struct socket *sock; | |
1212 | int error; | |
1213 | int type; | |
9dbc240f TT |
1214 | struct sockaddr_storage addr; |
1215 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1216 | int newlen; | |
c69da774 TM |
1217 | int family; |
1218 | int val; | |
5216a8e7 | 1219 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1220 | |
ad06e4bd CL |
1221 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1222 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1223 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1224 | |
1225 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1226 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1227 | "sockets supported\n"); | |
b700cbb1 | 1228 | return ERR_PTR(-EINVAL); |
1da177e4 | 1229 | } |
c69da774 | 1230 | |
1da177e4 | 1231 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1232 | switch (sin->sa_family) { |
1233 | case AF_INET6: | |
1234 | family = PF_INET6; | |
1235 | break; | |
1236 | case AF_INET: | |
1237 | family = PF_INET; | |
1238 | break; | |
1239 | default: | |
1240 | return ERR_PTR(-EINVAL); | |
1241 | } | |
1da177e4 | 1242 | |
c69da774 | 1243 | error = sock_create_kern(family, type, protocol, &sock); |
77f1f67a | 1244 | if (error < 0) |
b700cbb1 | 1245 | return ERR_PTR(error); |
1da177e4 | 1246 | |
ed07536e PZ |
1247 | svc_reclassify_socket(sock); |
1248 | ||
c69da774 TM |
1249 | /* |
1250 | * If this is an PF_INET6 listener, we want to avoid | |
1251 | * getting requests from IPv4 remotes. Those should | |
1252 | * be shunted to a PF_INET listener via rpcbind. | |
1253 | */ | |
1254 | val = 1; | |
1255 | if (family == PF_INET6) | |
1256 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1257 | (char *)&val, sizeof(val)); | |
1258 | ||
18114746 | 1259 | if (type == SOCK_STREAM) |
77f1f67a CL |
1260 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
1261 | error = kernel_bind(sock, sin, len); | |
18114746 ES |
1262 | if (error < 0) |
1263 | goto bummer; | |
1da177e4 | 1264 | |
9dbc240f TT |
1265 | newlen = len; |
1266 | error = kernel_getsockname(sock, newsin, &newlen); | |
1267 | if (error < 0) | |
1268 | goto bummer; | |
1269 | ||
1da177e4 | 1270 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1271 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1272 | goto bummer; |
1273 | } | |
1274 | ||
e79eff1f | 1275 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
9dbc240f | 1276 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
b700cbb1 | 1277 | return (struct svc_xprt *)svsk; |
e79eff1f | 1278 | } |
1da177e4 LT |
1279 | |
1280 | bummer: | |
1281 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1282 | sock_release(sock); | |
b700cbb1 | 1283 | return ERR_PTR(error); |
1da177e4 LT |
1284 | } |
1285 | ||
755cceab TT |
1286 | /* |
1287 | * Detach the svc_sock from the socket so that no | |
1288 | * more callbacks occur. | |
1289 | */ | |
1290 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1291 | { | |
1292 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1293 | struct sock *sk = svsk->sk_sk; | |
1294 | ||
1295 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1296 | ||
1297 | /* put back the old socket callbacks */ | |
1298 | sk->sk_state_change = svsk->sk_ostate; | |
1299 | sk->sk_data_ready = svsk->sk_odata; | |
1300 | sk->sk_write_space = svsk->sk_owspace; | |
69b6ba37 TM |
1301 | |
1302 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1303 | wake_up_interruptible(sk->sk_sleep); | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * Disconnect the socket, and reset the callbacks | |
1308 | */ | |
1309 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1310 | { | |
1311 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1312 | ||
1313 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1314 | ||
1315 | svc_sock_detach(xprt); | |
1316 | ||
1317 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
1318 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); | |
755cceab TT |
1319 | } |
1320 | ||
1321 | /* | |
1322 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1323 | */ | |
1324 | static void svc_sock_free(struct svc_xprt *xprt) | |
1325 | { | |
1326 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1327 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1328 | ||
755cceab TT |
1329 | if (svsk->sk_sock->file) |
1330 | sockfd_put(svsk->sk_sock); | |
1331 | else | |
1332 | sock_release(svsk->sk_sock); | |
1333 | kfree(svsk); | |
1334 | } |