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> |
c752f073 | 41 | #include <net/tcp_states.h> |
1da177e4 LT |
42 | #include <asm/uaccess.h> |
43 | #include <asm/ioctls.h> | |
44 | ||
45 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 46 | #include <linux/sunrpc/clnt.h> |
1da177e4 LT |
47 | #include <linux/sunrpc/xdr.h> |
48 | #include <linux/sunrpc/svcsock.h> | |
49 | #include <linux/sunrpc/stats.h> | |
50 | ||
360d8738 | 51 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
52 | |
53 | ||
54 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
6b174337 | 55 | int *errp, int flags); |
1da177e4 LT |
56 | static void svc_udp_data_ready(struct sock *, int); |
57 | static int svc_udp_recvfrom(struct svc_rqst *); | |
58 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab TT |
59 | static void svc_sock_detach(struct svc_xprt *); |
60 | static void svc_sock_free(struct svc_xprt *); | |
1da177e4 | 61 | |
b700cbb1 TT |
62 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
63 | struct sockaddr *, int, int); | |
ed07536e PZ |
64 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
65 | static struct lock_class_key svc_key[2]; | |
66 | static struct lock_class_key svc_slock_key[2]; | |
67 | ||
0f0257ea | 68 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
69 | { |
70 | struct sock *sk = sock->sk; | |
02b3d346 | 71 | BUG_ON(sock_owned_by_user(sk)); |
ed07536e PZ |
72 | switch (sk->sk_family) { |
73 | case AF_INET: | |
74 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
75 | &svc_slock_key[0], |
76 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
77 | &svc_key[0]); | |
ed07536e PZ |
78 | break; |
79 | ||
80 | case AF_INET6: | |
81 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
82 | &svc_slock_key[1], |
83 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
84 | &svc_key[1]); | |
ed07536e PZ |
85 | break; |
86 | ||
87 | default: | |
88 | BUG(); | |
89 | } | |
90 | } | |
91 | #else | |
0f0257ea | 92 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
93 | { |
94 | } | |
95 | #endif | |
96 | ||
1da177e4 LT |
97 | /* |
98 | * Release an skbuff after use | |
99 | */ | |
5148bf4e | 100 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 101 | { |
5148bf4e | 102 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
103 | struct svc_deferred_req *dr = rqstp->rq_deferred; |
104 | ||
105 | if (skb) { | |
57b1d3ba TT |
106 | struct svc_sock *svsk = |
107 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 108 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
109 | |
110 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
57b1d3ba | 111 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
112 | } |
113 | if (dr) { | |
114 | rqstp->rq_deferred = NULL; | |
115 | kfree(dr); | |
116 | } | |
117 | } | |
118 | ||
b92503b2 CL |
119 | union svc_pktinfo_u { |
120 | struct in_pktinfo pkti; | |
b92503b2 | 121 | struct in6_pktinfo pkti6; |
b92503b2 | 122 | }; |
bc375ea7 DM |
123 | #define SVC_PKTINFO_SPACE \ |
124 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
125 | |
126 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
127 | { | |
57b1d3ba TT |
128 | struct svc_sock *svsk = |
129 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
130 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
131 | case AF_INET: { |
132 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
133 | ||
134 | cmh->cmsg_level = SOL_IP; | |
135 | cmh->cmsg_type = IP_PKTINFO; | |
136 | pki->ipi_ifindex = 0; | |
137 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
138 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
139 | } | |
140 | break; | |
5a05ed73 | 141 | |
b92503b2 CL |
142 | case AF_INET6: { |
143 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
144 | ||
145 | cmh->cmsg_level = SOL_IPV6; | |
146 | cmh->cmsg_type = IPV6_PKTINFO; | |
147 | pki->ipi6_ifindex = 0; | |
148 | ipv6_addr_copy(&pki->ipi6_addr, | |
149 | &rqstp->rq_daddr.addr6); | |
150 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
151 | } | |
152 | break; | |
b92503b2 CL |
153 | } |
154 | return; | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /* |
158 | * Generic sendto routine | |
159 | */ | |
0f0257ea | 160 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) |
1da177e4 | 161 | { |
57b1d3ba TT |
162 | struct svc_sock *svsk = |
163 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1da177e4 LT |
164 | struct socket *sock = svsk->sk_sock; |
165 | int slen; | |
bc375ea7 DM |
166 | union { |
167 | struct cmsghdr hdr; | |
168 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
169 | } buffer; | |
170 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 LT |
171 | int len = 0; |
172 | int result; | |
173 | int size; | |
174 | struct page **ppage = xdr->pages; | |
175 | size_t base = xdr->page_base; | |
176 | unsigned int pglen = xdr->page_len; | |
177 | unsigned int flags = MSG_MORE; | |
ad06e4bd | 178 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
179 | |
180 | slen = xdr->len; | |
181 | ||
182 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
b92503b2 CL |
183 | struct msghdr msg = { |
184 | .msg_name = &rqstp->rq_addr, | |
185 | .msg_namelen = rqstp->rq_addrlen, | |
186 | .msg_control = cmh, | |
187 | .msg_controllen = sizeof(buffer), | |
188 | .msg_flags = MSG_MORE, | |
189 | }; | |
190 | ||
191 | svc_set_cmsg_data(rqstp, cmh); | |
1da177e4 LT |
192 | |
193 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
194 | goto out; | |
195 | } | |
196 | ||
197 | /* send head */ | |
198 | if (slen == xdr->head[0].iov_len) | |
199 | flags = 0; | |
44524359 N |
200 | len = kernel_sendpage(sock, rqstp->rq_respages[0], 0, |
201 | xdr->head[0].iov_len, flags); | |
1da177e4 LT |
202 | if (len != xdr->head[0].iov_len) |
203 | goto out; | |
204 | slen -= xdr->head[0].iov_len; | |
205 | if (slen == 0) | |
206 | goto out; | |
207 | ||
208 | /* send page data */ | |
209 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
210 | while (pglen > 0) { | |
211 | if (slen == size) | |
212 | flags = 0; | |
e6242e92 | 213 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
214 | if (result > 0) |
215 | len += result; | |
216 | if (result != size) | |
217 | goto out; | |
218 | slen -= size; | |
219 | pglen -= size; | |
220 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
221 | base = 0; | |
222 | ppage++; | |
223 | } | |
224 | /* send tail */ | |
225 | if (xdr->tail[0].iov_len) { | |
44524359 N |
226 | result = kernel_sendpage(sock, rqstp->rq_respages[0], |
227 | ((unsigned long)xdr->tail[0].iov_base) | |
cca5172a | 228 | & (PAGE_SIZE-1), |
1da177e4 LT |
229 | xdr->tail[0].iov_len, 0); |
230 | ||
231 | if (result > 0) | |
232 | len += result; | |
233 | } | |
234 | out: | |
ad06e4bd | 235 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 236 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 237 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
238 | |
239 | return len; | |
240 | } | |
241 | ||
80212d59 N |
242 | /* |
243 | * Report socket names for nfsdfs | |
244 | */ | |
245 | static int one_sock_name(char *buf, struct svc_sock *svsk) | |
246 | { | |
247 | int len; | |
248 | ||
249 | switch(svsk->sk_sk->sk_family) { | |
250 | case AF_INET: | |
251 | len = sprintf(buf, "ipv4 %s %u.%u.%u.%u %d\n", | |
252 | svsk->sk_sk->sk_protocol==IPPROTO_UDP? | |
253 | "udp" : "tcp", | |
254 | NIPQUAD(inet_sk(svsk->sk_sk)->rcv_saddr), | |
255 | inet_sk(svsk->sk_sk)->num); | |
256 | break; | |
257 | default: | |
258 | len = sprintf(buf, "*unknown-%d*\n", | |
259 | svsk->sk_sk->sk_family); | |
260 | } | |
261 | return len; | |
262 | } | |
263 | ||
264 | int | |
b41b66d6 | 265 | svc_sock_names(char *buf, struct svc_serv *serv, char *toclose) |
80212d59 | 266 | { |
b41b66d6 | 267 | struct svc_sock *svsk, *closesk = NULL; |
80212d59 N |
268 | int len = 0; |
269 | ||
270 | if (!serv) | |
271 | return 0; | |
aaf68cfb | 272 | spin_lock_bh(&serv->sv_lock); |
7a182083 | 273 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
80212d59 | 274 | int onelen = one_sock_name(buf+len, svsk); |
b41b66d6 N |
275 | if (toclose && strcmp(toclose, buf+len) == 0) |
276 | closesk = svsk; | |
277 | else | |
278 | len += onelen; | |
80212d59 | 279 | } |
aaf68cfb | 280 | spin_unlock_bh(&serv->sv_lock); |
b41b66d6 | 281 | if (closesk) |
5680c446 N |
282 | /* Should unregister with portmap, but you cannot |
283 | * unregister just one protocol... | |
284 | */ | |
7a182083 | 285 | svc_close_xprt(&closesk->sk_xprt); |
37a03472 N |
286 | else if (toclose) |
287 | return -ENOENT; | |
80212d59 N |
288 | return len; |
289 | } | |
290 | EXPORT_SYMBOL(svc_sock_names); | |
291 | ||
1da177e4 LT |
292 | /* |
293 | * Check input queue length | |
294 | */ | |
0f0257ea | 295 | static int svc_recv_available(struct svc_sock *svsk) |
1da177e4 | 296 | { |
1da177e4 LT |
297 | struct socket *sock = svsk->sk_sock; |
298 | int avail, err; | |
299 | ||
e6242e92 | 300 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
1da177e4 LT |
301 | |
302 | return (err >= 0)? avail : err; | |
303 | } | |
304 | ||
305 | /* | |
306 | * Generic recvfrom routine. | |
307 | */ | |
0f0257ea TT |
308 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
309 | int buflen) | |
1da177e4 | 310 | { |
57b1d3ba TT |
311 | struct svc_sock *svsk = |
312 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1ba95105 CL |
313 | struct msghdr msg = { |
314 | .msg_flags = MSG_DONTWAIT, | |
315 | }; | |
316 | int len; | |
1da177e4 | 317 | |
1ba95105 CL |
318 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
319 | msg.msg_flags); | |
1da177e4 | 320 | |
1da177e4 | 321 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
1ba95105 | 322 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
323 | return len; |
324 | } | |
325 | ||
326 | /* | |
327 | * Set socket snd and rcv buffer lengths | |
328 | */ | |
0f0257ea TT |
329 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
330 | unsigned int rcv) | |
1da177e4 LT |
331 | { |
332 | #if 0 | |
333 | mm_segment_t oldfs; | |
334 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
335 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
336 | (char*)&snd, sizeof(snd)); | |
337 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
338 | (char*)&rcv, sizeof(rcv)); | |
339 | #else | |
340 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
341 | * which isn't acceptable. Until that is made conditional | |
342 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
343 | * DaveM said I could! | |
344 | */ | |
345 | lock_sock(sock->sk); | |
346 | sock->sk->sk_sndbuf = snd * 2; | |
347 | sock->sk->sk_rcvbuf = rcv * 2; | |
348 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; | |
349 | release_sock(sock->sk); | |
350 | #endif | |
351 | } | |
352 | /* | |
353 | * INET callback when data has been received on the socket. | |
354 | */ | |
0f0257ea | 355 | static void svc_udp_data_ready(struct sock *sk, int count) |
1da177e4 | 356 | { |
939bb7ef | 357 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 358 | |
939bb7ef NB |
359 | if (svsk) { |
360 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
02fc6c36 TT |
361 | svsk, sk, count, |
362 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
363 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
f6150c3c | 364 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 365 | } |
1da177e4 LT |
366 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
367 | wake_up_interruptible(sk->sk_sleep); | |
368 | } | |
369 | ||
370 | /* | |
371 | * INET callback when space is newly available on the socket. | |
372 | */ | |
0f0257ea | 373 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
374 | { |
375 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
376 | ||
377 | if (svsk) { | |
378 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 379 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
f6150c3c | 380 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 LT |
381 | } |
382 | ||
383 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) { | |
939bb7ef | 384 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
1da177e4 LT |
385 | svsk); |
386 | wake_up_interruptible(sk->sk_sleep); | |
387 | } | |
388 | } | |
389 | ||
9dbc240f TT |
390 | /* |
391 | * Copy the UDP datagram's destination address to the rqstp structure. | |
392 | * The 'destination' address in this case is the address to which the | |
393 | * peer sent the datagram, i.e. our local address. For multihomed | |
394 | * hosts, this can change from msg to msg. Note that only the IP | |
395 | * address changes, the port number should remain the same. | |
396 | */ | |
397 | static void svc_udp_get_dest_address(struct svc_rqst *rqstp, | |
398 | struct cmsghdr *cmh) | |
95756482 | 399 | { |
57b1d3ba TT |
400 | struct svc_sock *svsk = |
401 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
402 | switch (svsk->sk_sk->sk_family) { | |
95756482 | 403 | case AF_INET: { |
7a37f578 N |
404 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
405 | rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; | |
95756482 | 406 | break; |
7a37f578 | 407 | } |
95756482 | 408 | case AF_INET6: { |
7a37f578 N |
409 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
410 | ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); | |
95756482 | 411 | break; |
7a37f578 | 412 | } |
95756482 | 413 | } |
95756482 CL |
414 | } |
415 | ||
1da177e4 LT |
416 | /* |
417 | * Receive a datagram from a UDP socket. | |
418 | */ | |
0f0257ea | 419 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 420 | { |
57b1d3ba TT |
421 | struct svc_sock *svsk = |
422 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 423 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 424 | struct sk_buff *skb; |
bc375ea7 DM |
425 | union { |
426 | struct cmsghdr hdr; | |
427 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
428 | } buffer; | |
429 | struct cmsghdr *cmh = &buffer.hdr; | |
1da177e4 | 430 | int err, len; |
7a37f578 N |
431 | struct msghdr msg = { |
432 | .msg_name = svc_addr(rqstp), | |
433 | .msg_control = cmh, | |
434 | .msg_controllen = sizeof(buffer), | |
435 | .msg_flags = MSG_DONTWAIT, | |
436 | }; | |
1da177e4 | 437 | |
02fc6c36 | 438 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
439 | /* udp sockets need large rcvbuf as all pending |
440 | * requests are still in that buffer. sndbuf must | |
441 | * also be large enough that there is enough space | |
3262c816 GB |
442 | * for one reply per thread. We count all threads |
443 | * rather than threads in a particular pool, which | |
444 | * provides an upper bound on the number of threads | |
445 | * which will access the socket. | |
1da177e4 LT |
446 | */ |
447 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
448 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
449 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 450 | |
02fc6c36 | 451 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
452 | skb = NULL; |
453 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
454 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
455 | if (err >= 0) | |
456 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
457 | ||
458 | if (skb == NULL) { | |
459 | if (err != -EAGAIN) { | |
460 | /* possibly an icmp error */ | |
461 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 462 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 463 | } |
a6046f71 | 464 | svc_xprt_received(&svsk->sk_xprt); |
05ed690e | 465 | return -EAGAIN; |
1da177e4 | 466 | } |
9dbc240f TT |
467 | len = svc_addr_len(svc_addr(rqstp)); |
468 | if (len < 0) | |
469 | return len; | |
470 | rqstp->rq_addrlen = len; | |
b7aa0bf7 ED |
471 | if (skb->tstamp.tv64 == 0) { |
472 | skb->tstamp = ktime_get_real(); | |
cca5172a | 473 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
474 | need that much accuracy */ |
475 | } | |
b7aa0bf7 | 476 | svsk->sk_sk->sk_stamp = skb->tstamp; |
02fc6c36 | 477 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 LT |
478 | |
479 | /* | |
480 | * Maybe more packets - kick another thread ASAP. | |
481 | */ | |
a6046f71 | 482 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
483 | |
484 | len = skb->len - sizeof(struct udphdr); | |
485 | rqstp->rq_arg.len = len; | |
486 | ||
95756482 | 487 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 488 | |
7a37f578 N |
489 | if (cmh->cmsg_level != IPPROTO_IP || |
490 | cmh->cmsg_type != IP_PKTINFO) { | |
491 | if (net_ratelimit()) | |
492 | printk("rpcsvc: received unknown control message:" | |
493 | "%d/%d\n", | |
494 | cmh->cmsg_level, cmh->cmsg_type); | |
495 | skb_free_datagram(svsk->sk_sk, skb); | |
496 | return 0; | |
497 | } | |
498 | svc_udp_get_dest_address(rqstp, cmh); | |
1da177e4 LT |
499 | |
500 | if (skb_is_nonlinear(skb)) { | |
501 | /* we have to copy */ | |
502 | local_bh_disable(); | |
503 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
504 | local_bh_enable(); | |
505 | /* checksum error */ | |
506 | skb_free_datagram(svsk->sk_sk, skb); | |
507 | return 0; | |
508 | } | |
509 | local_bh_enable(); | |
cca5172a | 510 | skb_free_datagram(svsk->sk_sk, skb); |
1da177e4 LT |
511 | } else { |
512 | /* we can use it in-place */ | |
0f0257ea TT |
513 | rqstp->rq_arg.head[0].iov_base = skb->data + |
514 | sizeof(struct udphdr); | |
1da177e4 | 515 | rqstp->rq_arg.head[0].iov_len = len; |
fb286bb2 HX |
516 | if (skb_checksum_complete(skb)) { |
517 | skb_free_datagram(svsk->sk_sk, skb); | |
518 | return 0; | |
1da177e4 | 519 | } |
5148bf4e | 520 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
521 | } |
522 | ||
523 | rqstp->rq_arg.page_base = 0; | |
524 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
525 | rqstp->rq_arg.head[0].iov_len = len; | |
526 | rqstp->rq_arg.page_len = 0; | |
44524359 | 527 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
528 | } else { |
529 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 530 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 531 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 LT |
532 | } |
533 | ||
534 | if (serv->sv_stats) | |
535 | serv->sv_stats->netudpcnt++; | |
536 | ||
537 | return len; | |
538 | } | |
539 | ||
540 | static int | |
541 | svc_udp_sendto(struct svc_rqst *rqstp) | |
542 | { | |
543 | int error; | |
544 | ||
545 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
546 | if (error == -ECONNREFUSED) | |
547 | /* ICMP error on earlier request. */ | |
548 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
549 | ||
550 | return error; | |
551 | } | |
552 | ||
e831fe65 TT |
553 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
554 | { | |
555 | } | |
556 | ||
323bee32 TT |
557 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
558 | { | |
559 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 560 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
561 | unsigned long required; |
562 | ||
563 | /* | |
564 | * Set the SOCK_NOSPACE flag before checking the available | |
565 | * sock space. | |
566 | */ | |
567 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 568 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
569 | if (required*2 > sock_wspace(svsk->sk_sk)) |
570 | return 0; | |
571 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
572 | return 1; | |
573 | } | |
574 | ||
38a417cc TT |
575 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
576 | { | |
577 | BUG(); | |
578 | return NULL; | |
579 | } | |
580 | ||
b700cbb1 TT |
581 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
582 | struct sockaddr *sa, int salen, | |
583 | int flags) | |
584 | { | |
585 | return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags); | |
586 | } | |
587 | ||
360d8738 | 588 | static struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 589 | .xpo_create = svc_udp_create, |
5d137990 TT |
590 | .xpo_recvfrom = svc_udp_recvfrom, |
591 | .xpo_sendto = svc_udp_sendto, | |
5148bf4e | 592 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
593 | .xpo_detach = svc_sock_detach, |
594 | .xpo_free = svc_sock_free, | |
e831fe65 | 595 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
323bee32 | 596 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 597 | .xpo_accept = svc_udp_accept, |
360d8738 TT |
598 | }; |
599 | ||
600 | static struct svc_xprt_class svc_udp_class = { | |
601 | .xcl_name = "udp", | |
b700cbb1 | 602 | .xcl_owner = THIS_MODULE, |
360d8738 | 603 | .xcl_ops = &svc_udp_ops, |
49023155 | 604 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
360d8738 TT |
605 | }; |
606 | ||
bb5cf160 | 607 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 608 | { |
7a37f578 N |
609 | int one = 1; |
610 | mm_segment_t oldfs; | |
611 | ||
bb5cf160 | 612 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); |
def13d74 | 613 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
614 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
615 | svsk->sk_sk->sk_write_space = svc_write_space; | |
1da177e4 LT |
616 | |
617 | /* initialise setting must have enough space to | |
cca5172a | 618 | * receive and respond to one request. |
1da177e4 LT |
619 | * svc_udp_recvfrom will re-adjust if necessary |
620 | */ | |
621 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
622 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
623 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 624 | |
0f0257ea TT |
625 | /* data might have come in before data_ready set up */ |
626 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 627 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 N |
628 | |
629 | oldfs = get_fs(); | |
630 | set_fs(KERNEL_DS); | |
631 | /* make sure we get destination address info */ | |
632 | svsk->sk_sock->ops->setsockopt(svsk->sk_sock, IPPROTO_IP, IP_PKTINFO, | |
633 | (char __user *)&one, sizeof(one)); | |
634 | set_fs(oldfs); | |
1da177e4 LT |
635 | } |
636 | ||
637 | /* | |
638 | * A data_ready event on a listening socket means there's a connection | |
639 | * pending. Do not use state_change as a substitute for it. | |
640 | */ | |
0f0257ea | 641 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
1da177e4 | 642 | { |
939bb7ef | 643 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
644 | |
645 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 646 | sk, sk->sk_state); |
1da177e4 | 647 | |
939bb7ef NB |
648 | /* |
649 | * This callback may called twice when a new connection | |
650 | * is established as a child socket inherits everything | |
651 | * from a parent LISTEN socket. | |
652 | * 1) data_ready method of the parent socket will be called | |
653 | * when one of child sockets become ESTABLISHED. | |
654 | * 2) data_ready method of the child socket may be called | |
655 | * when it receives data before the socket is accepted. | |
656 | * In case of 2, we should ignore it silently. | |
657 | */ | |
658 | if (sk->sk_state == TCP_LISTEN) { | |
659 | if (svsk) { | |
02fc6c36 | 660 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 661 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
662 | } else |
663 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 664 | } |
939bb7ef | 665 | |
1da177e4 LT |
666 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
667 | wake_up_interruptible_all(sk->sk_sleep); | |
668 | } | |
669 | ||
670 | /* | |
671 | * A state change on a connected socket means it's dying or dead. | |
672 | */ | |
0f0257ea | 673 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 674 | { |
939bb7ef | 675 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
676 | |
677 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 678 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 679 | |
939bb7ef | 680 | if (!svsk) |
1da177e4 | 681 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 682 | else { |
02fc6c36 | 683 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 684 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 685 | } |
1da177e4 LT |
686 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
687 | wake_up_interruptible_all(sk->sk_sleep); | |
688 | } | |
689 | ||
0f0257ea | 690 | static void svc_tcp_data_ready(struct sock *sk, int count) |
1da177e4 | 691 | { |
939bb7ef | 692 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
693 | |
694 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
939bb7ef NB |
695 | sk, sk->sk_user_data); |
696 | if (svsk) { | |
02fc6c36 | 697 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 698 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef | 699 | } |
1da177e4 LT |
700 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
701 | wake_up_interruptible(sk->sk_sleep); | |
702 | } | |
703 | ||
704 | /* | |
705 | * Accept a TCP connection | |
706 | */ | |
38a417cc | 707 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 708 | { |
38a417cc | 709 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f AM |
710 | struct sockaddr_storage addr; |
711 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 712 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
713 | struct socket *sock = svsk->sk_sock; |
714 | struct socket *newsock; | |
1da177e4 LT |
715 | struct svc_sock *newsvsk; |
716 | int err, slen; | |
ad06e4bd | 717 | char buf[RPC_MAX_ADDRBUFLEN]; |
1da177e4 LT |
718 | |
719 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
720 | if (!sock) | |
38a417cc | 721 | return NULL; |
1da177e4 | 722 | |
02fc6c36 | 723 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
724 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
725 | if (err < 0) { | |
1da177e4 LT |
726 | if (err == -ENOMEM) |
727 | printk(KERN_WARNING "%s: no more sockets!\n", | |
728 | serv->sv_name); | |
e6242e92 | 729 | else if (err != -EAGAIN && net_ratelimit()) |
1da177e4 LT |
730 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
731 | serv->sv_name, -err); | |
38a417cc | 732 | return NULL; |
1da177e4 | 733 | } |
02fc6c36 | 734 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 735 | |
cdd88b9f | 736 | err = kernel_getpeername(newsock, sin, &slen); |
1da177e4 LT |
737 | if (err < 0) { |
738 | if (net_ratelimit()) | |
739 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
740 | serv->sv_name, -err); | |
741 | goto failed; /* aborted connection or whatever */ | |
742 | } | |
743 | ||
744 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
745 | * hosts here, but when we get encryption, the IP of the host won't |
746 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 747 | */ |
cdd88b9f | 748 | if (!svc_port_is_privileged(sin)) { |
1da177e4 | 749 | dprintk(KERN_WARNING |
ad06e4bd | 750 | "%s: connect from unprivileged port: %s\n", |
cca5172a | 751 | serv->sv_name, |
cdd88b9f | 752 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 753 | } |
ad06e4bd | 754 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 755 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
756 | |
757 | /* make sure that a write doesn't block forever when | |
758 | * low on memory | |
759 | */ | |
760 | newsock->sk->sk_sndtimeo = HZ*30; | |
761 | ||
6b174337 CL |
762 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
763 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
1da177e4 | 764 | goto failed; |
9dbc240f | 765 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
a9747692 FM |
766 | err = kernel_getsockname(newsock, sin, &slen); |
767 | if (unlikely(err < 0)) { | |
768 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
769 | slen = offsetof(struct sockaddr, sa_data); | |
770 | } | |
9dbc240f | 771 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 772 | |
f9f3cc4f TT |
773 | if (serv->sv_stats) |
774 | serv->sv_stats->nettcpconn++; | |
775 | ||
776 | return &newsvsk->sk_xprt; | |
777 | ||
778 | failed: | |
779 | sock_release(newsock); | |
780 | return NULL; | |
781 | } | |
782 | ||
1da177e4 LT |
783 | /* |
784 | * Receive data from a TCP socket. | |
785 | */ | |
0f0257ea | 786 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 787 | { |
57b1d3ba TT |
788 | struct svc_sock *svsk = |
789 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 790 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 791 | int len; |
3cc03b16 | 792 | struct kvec *vec; |
1da177e4 LT |
793 | int pnum, vlen; |
794 | ||
795 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
02fc6c36 TT |
796 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), |
797 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
798 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1da177e4 | 799 | |
02fc6c36 | 800 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
801 | /* sndbuf needs to have room for one request |
802 | * per thread, otherwise we can stall even when the | |
803 | * network isn't a bottleneck. | |
3262c816 GB |
804 | * |
805 | * We count all threads rather than threads in a | |
806 | * particular pool, which provides an upper bound | |
807 | * on the number of threads which will access the socket. | |
808 | * | |
1da177e4 | 809 | * rcvbuf just needs to be able to hold a few requests. |
cca5172a | 810 | * Normally they will be removed from the queue |
1da177e4 LT |
811 | * as soon a a complete request arrives. |
812 | */ | |
813 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
814 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
815 | 3 * serv->sv_max_mesg); | |
1da177e4 | 816 | |
02fc6c36 | 817 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
818 | |
819 | /* Receive data. If we haven't got the record length yet, get | |
820 | * the next four bytes. Otherwise try to gobble up as much as | |
821 | * possible up to the complete record length. | |
822 | */ | |
823 | if (svsk->sk_tcplen < 4) { | |
824 | unsigned long want = 4 - svsk->sk_tcplen; | |
825 | struct kvec iov; | |
826 | ||
827 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; | |
828 | iov.iov_len = want; | |
829 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
830 | goto error; | |
831 | svsk->sk_tcplen += len; | |
832 | ||
833 | if (len < want) { | |
834 | dprintk("svc: short recvfrom while reading record length (%d of %lu)\n", | |
cca5172a | 835 | len, want); |
a6046f71 | 836 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
837 | return -EAGAIN; /* record header not complete */ |
838 | } | |
839 | ||
840 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
841 | if (!(svsk->sk_reclen & 0x80000000)) { | |
842 | /* FIXME: technically, a record can be fragmented, | |
843 | * and non-terminal fragments will not have the top | |
844 | * bit set in the fragment length header. | |
845 | * But apparently no known nfs clients send fragmented | |
846 | * records. */ | |
34e9a63b N |
847 | if (net_ratelimit()) |
848 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
849 | " (non-terminal)\n", | |
850 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
851 | goto err_delete; |
852 | } | |
853 | svsk->sk_reclen &= 0x7fffffff; | |
854 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); | |
c6b0a9f8 | 855 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
34e9a63b N |
856 | if (net_ratelimit()) |
857 | printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx" | |
858 | " (large)\n", | |
859 | (unsigned long) svsk->sk_reclen); | |
1da177e4 LT |
860 | goto err_delete; |
861 | } | |
862 | } | |
863 | ||
864 | /* Check whether enough data is available */ | |
865 | len = svc_recv_available(svsk); | |
866 | if (len < 0) | |
867 | goto error; | |
868 | ||
869 | if (len < svsk->sk_reclen) { | |
870 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
871 | len, svsk->sk_reclen); | |
a6046f71 | 872 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
873 | return -EAGAIN; /* record not complete */ |
874 | } | |
875 | len = svsk->sk_reclen; | |
02fc6c36 | 876 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 877 | |
3cc03b16 | 878 | vec = rqstp->rq_vec; |
1da177e4 LT |
879 | vec[0] = rqstp->rq_arg.head[0]; |
880 | vlen = PAGE_SIZE; | |
881 | pnum = 1; | |
882 | while (vlen < len) { | |
44524359 | 883 | vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]); |
1da177e4 LT |
884 | vec[pnum].iov_len = PAGE_SIZE; |
885 | pnum++; | |
886 | vlen += PAGE_SIZE; | |
887 | } | |
44524359 | 888 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
1da177e4 LT |
889 | |
890 | /* Now receive data */ | |
891 | len = svc_recvfrom(rqstp, vec, pnum, len); | |
892 | if (len < 0) | |
893 | goto error; | |
894 | ||
895 | dprintk("svc: TCP complete record (%d bytes)\n", len); | |
896 | rqstp->rq_arg.len = len; | |
897 | rqstp->rq_arg.page_base = 0; | |
898 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
899 | rqstp->rq_arg.head[0].iov_len = len; | |
900 | rqstp->rq_arg.page_len = 0; | |
901 | } else { | |
902 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
903 | } | |
904 | ||
5148bf4e | 905 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
906 | rqstp->rq_prot = IPPROTO_TCP; |
907 | ||
908 | /* Reset TCP read info */ | |
909 | svsk->sk_reclen = 0; | |
910 | svsk->sk_tcplen = 0; | |
911 | ||
9dbc240f | 912 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
a6046f71 | 913 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
914 | if (serv->sv_stats) |
915 | serv->sv_stats->nettcpcnt++; | |
916 | ||
917 | return len; | |
918 | ||
919 | err_delete: | |
02fc6c36 | 920 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
921 | return -EAGAIN; |
922 | ||
923 | error: | |
924 | if (len == -EAGAIN) { | |
925 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
a6046f71 | 926 | svc_xprt_received(&svsk->sk_xprt); |
1da177e4 LT |
927 | } else { |
928 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
bb5cf160 | 929 | svsk->sk_xprt.xpt_server->sv_name, -len); |
93fbf1a5 | 930 | goto err_delete; |
1da177e4 LT |
931 | } |
932 | ||
933 | return len; | |
934 | } | |
935 | ||
936 | /* | |
937 | * Send out data on TCP socket. | |
938 | */ | |
0f0257ea | 939 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
940 | { |
941 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
942 | int sent; | |
d8ed029d | 943 | __be32 reclen; |
1da177e4 LT |
944 | |
945 | /* Set up the first element of the reply kvec. | |
946 | * Any other kvecs that may be in use have been taken | |
947 | * care of by the server implementation itself. | |
948 | */ | |
949 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
950 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
951 | ||
57b1d3ba | 952 | if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags)) |
1da177e4 LT |
953 | return -ENOTCONN; |
954 | ||
955 | sent = svc_sendto(rqstp, &rqstp->rq_res); | |
956 | if (sent != xbufp->len) { | |
0f0257ea TT |
957 | printk(KERN_NOTICE |
958 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
959 | "- shutting down socket\n", | |
57b1d3ba | 960 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
961 | (sent<0)?"got error":"sent only", |
962 | sent, xbufp->len); | |
57b1d3ba | 963 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 964 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
965 | sent = -EAGAIN; |
966 | } | |
967 | return sent; | |
968 | } | |
969 | ||
e831fe65 TT |
970 | /* |
971 | * Setup response header. TCP has a 4B record length field. | |
972 | */ | |
973 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
974 | { | |
975 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
976 | ||
977 | /* tcp needs a space for the record length... */ | |
978 | svc_putnl(resv, 0); | |
979 | } | |
980 | ||
323bee32 TT |
981 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
982 | { | |
57b1d3ba | 983 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
bb5cf160 | 984 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
323bee32 TT |
985 | int required; |
986 | int wspace; | |
987 | ||
988 | /* | |
989 | * Set the SOCK_NOSPACE flag before checking the available | |
990 | * sock space. | |
991 | */ | |
992 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 993 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
994 | wspace = sk_stream_wspace(svsk->sk_sk); |
995 | ||
996 | if (wspace < sk_stream_min_wspace(svsk->sk_sk)) | |
997 | return 0; | |
998 | if (required * 2 > wspace) | |
999 | return 0; | |
1000 | ||
1001 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
1002 | return 1; | |
1003 | } | |
1004 | ||
b700cbb1 TT |
1005 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
1006 | struct sockaddr *sa, int salen, | |
1007 | int flags) | |
1008 | { | |
1009 | return svc_create_socket(serv, IPPROTO_TCP, sa, salen, flags); | |
1010 | } | |
1011 | ||
360d8738 | 1012 | static struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1013 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1014 | .xpo_recvfrom = svc_tcp_recvfrom, |
1015 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1016 | .xpo_release_rqst = svc_release_skb, |
755cceab TT |
1017 | .xpo_detach = svc_sock_detach, |
1018 | .xpo_free = svc_sock_free, | |
e831fe65 | 1019 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
323bee32 | 1020 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1021 | .xpo_accept = svc_tcp_accept, |
360d8738 TT |
1022 | }; |
1023 | ||
1024 | static struct svc_xprt_class svc_tcp_class = { | |
1025 | .xcl_name = "tcp", | |
b700cbb1 | 1026 | .xcl_owner = THIS_MODULE, |
360d8738 | 1027 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1028 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
360d8738 TT |
1029 | }; |
1030 | ||
1031 | void svc_init_xprt_sock(void) | |
1032 | { | |
1033 | svc_reg_xprt_class(&svc_tcp_class); | |
1034 | svc_reg_xprt_class(&svc_udp_class); | |
1035 | } | |
1036 | ||
1037 | void svc_cleanup_xprt_sock(void) | |
1038 | { | |
1039 | svc_unreg_xprt_class(&svc_tcp_class); | |
1040 | svc_unreg_xprt_class(&svc_udp_class); | |
1041 | } | |
1042 | ||
bb5cf160 | 1043 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1044 | { |
1045 | struct sock *sk = svsk->sk_sk; | |
1046 | struct tcp_sock *tp = tcp_sk(sk); | |
1047 | ||
bb5cf160 | 1048 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); |
def13d74 | 1049 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1050 | if (sk->sk_state == TCP_LISTEN) { |
1051 | dprintk("setting up TCP socket for listening\n"); | |
02fc6c36 | 1052 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1053 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1054 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1055 | } else { |
1056 | dprintk("setting up TCP socket for reading\n"); | |
1057 | sk->sk_state_change = svc_tcp_state_change; | |
1058 | sk->sk_data_ready = svc_tcp_data_ready; | |
1059 | sk->sk_write_space = svc_write_space; | |
1060 | ||
1061 | svsk->sk_reclen = 0; | |
1062 | svsk->sk_tcplen = 0; | |
1063 | ||
1064 | tp->nonagle = 1; /* disable Nagle's algorithm */ | |
1065 | ||
1066 | /* initialise setting must have enough space to | |
cca5172a | 1067 | * receive and respond to one request. |
1da177e4 LT |
1068 | * svc_tcp_recvfrom will re-adjust if necessary |
1069 | */ | |
1070 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
1071 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
1072 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 1073 | |
02fc6c36 TT |
1074 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1075 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
cca5172a | 1076 | if (sk->sk_state != TCP_ESTABLISHED) |
02fc6c36 | 1077 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1078 | } |
1079 | } | |
1080 | ||
0f0257ea | 1081 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1082 | { |
1083 | /* | |
1084 | * The number of server threads has changed. Update | |
1085 | * rcvbuf and sndbuf accordingly on all sockets | |
1086 | */ | |
1087 | struct list_head *le; | |
1088 | ||
1089 | spin_lock_bh(&serv->sv_lock); | |
1090 | list_for_each(le, &serv->sv_permsocks) { | |
cca5172a | 1091 | struct svc_sock *svsk = |
7a182083 | 1092 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1093 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1094 | } |
1095 | list_for_each(le, &serv->sv_tempsocks) { | |
1096 | struct svc_sock *svsk = | |
7a182083 | 1097 | list_entry(le, struct svc_sock, sk_xprt.xpt_list); |
02fc6c36 | 1098 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1099 | } |
1100 | spin_unlock_bh(&serv->sv_lock); | |
1101 | } | |
1102 | ||
1da177e4 LT |
1103 | /* |
1104 | * Initialize socket for RPC use and create svc_sock struct | |
1105 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1106 | */ | |
6b174337 CL |
1107 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1108 | struct socket *sock, | |
1109 | int *errp, int flags) | |
1da177e4 LT |
1110 | { |
1111 | struct svc_sock *svsk; | |
1112 | struct sock *inet; | |
6b174337 | 1113 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 LT |
1114 | |
1115 | dprintk("svc: svc_setup_socket %p\n", sock); | |
0da974f4 | 1116 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
1da177e4 LT |
1117 | *errp = -ENOMEM; |
1118 | return NULL; | |
1119 | } | |
1da177e4 LT |
1120 | |
1121 | inet = sock->sk; | |
1122 | ||
1123 | /* Register socket with portmapper */ | |
1124 | if (*errp >= 0 && pmap_register) | |
1125 | *errp = svc_register(serv, inet->sk_protocol, | |
1126 | ntohs(inet_sk(inet)->sport)); | |
1127 | ||
1128 | if (*errp < 0) { | |
1129 | kfree(svsk); | |
1130 | return NULL; | |
1131 | } | |
1132 | ||
1da177e4 LT |
1133 | inet->sk_user_data = svsk; |
1134 | svsk->sk_sock = sock; | |
1135 | svsk->sk_sk = inet; | |
1136 | svsk->sk_ostate = inet->sk_state_change; | |
1137 | svsk->sk_odata = inet->sk_data_ready; | |
1138 | svsk->sk_owspace = inet->sk_write_space; | |
1da177e4 LT |
1139 | |
1140 | /* Initialize the socket */ | |
1141 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1142 | svc_udp_init(svsk, serv); |
1da177e4 | 1143 | else |
bb5cf160 | 1144 | svc_tcp_init(svsk, serv); |
1da177e4 | 1145 | |
1da177e4 LT |
1146 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
1147 | svsk, svsk->sk_sk); | |
1148 | ||
1da177e4 LT |
1149 | return svsk; |
1150 | } | |
1151 | ||
b41b66d6 N |
1152 | int svc_addsock(struct svc_serv *serv, |
1153 | int fd, | |
1154 | char *name_return, | |
1155 | int *proto) | |
1156 | { | |
1157 | int err = 0; | |
1158 | struct socket *so = sockfd_lookup(fd, &err); | |
1159 | struct svc_sock *svsk = NULL; | |
1160 | ||
1161 | if (!so) | |
1162 | return err; | |
1163 | if (so->sk->sk_family != AF_INET) | |
1164 | err = -EAFNOSUPPORT; | |
1165 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1166 | so->sk->sk_protocol != IPPROTO_UDP) | |
1167 | err = -EPROTONOSUPPORT; | |
1168 | else if (so->state > SS_UNCONNECTED) | |
1169 | err = -EISCONN; | |
1170 | else { | |
6b174337 | 1171 | svsk = svc_setup_socket(serv, so, &err, SVC_SOCK_DEFAULTS); |
e79eff1f | 1172 | if (svsk) { |
9dbc240f TT |
1173 | struct sockaddr_storage addr; |
1174 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1175 | int salen; | |
1176 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1177 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
4e5caaa5 TT |
1178 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
1179 | spin_lock_bh(&serv->sv_lock); | |
1180 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1181 | spin_unlock_bh(&serv->sv_lock); | |
a6046f71 | 1182 | svc_xprt_received(&svsk->sk_xprt); |
b41b66d6 | 1183 | err = 0; |
e79eff1f | 1184 | } |
b41b66d6 N |
1185 | } |
1186 | if (err) { | |
1187 | sockfd_put(so); | |
1188 | return err; | |
1189 | } | |
1190 | if (proto) *proto = so->sk->sk_protocol; | |
1191 | return one_sock_name(name_return, svsk); | |
1192 | } | |
1193 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1194 | ||
1da177e4 LT |
1195 | /* |
1196 | * Create socket for RPC service. | |
1197 | */ | |
b700cbb1 TT |
1198 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1199 | int protocol, | |
1200 | struct sockaddr *sin, int len, | |
1201 | int flags) | |
1da177e4 LT |
1202 | { |
1203 | struct svc_sock *svsk; | |
1204 | struct socket *sock; | |
1205 | int error; | |
1206 | int type; | |
ad06e4bd | 1207 | char buf[RPC_MAX_ADDRBUFLEN]; |
9dbc240f TT |
1208 | struct sockaddr_storage addr; |
1209 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1210 | int newlen; | |
1da177e4 | 1211 | |
ad06e4bd CL |
1212 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1213 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1214 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1215 | |
1216 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1217 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1218 | "sockets supported\n"); | |
b700cbb1 | 1219 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1220 | } |
1221 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; | |
1222 | ||
77f1f67a CL |
1223 | error = sock_create_kern(sin->sa_family, type, protocol, &sock); |
1224 | if (error < 0) | |
b700cbb1 | 1225 | return ERR_PTR(error); |
1da177e4 | 1226 | |
ed07536e PZ |
1227 | svc_reclassify_socket(sock); |
1228 | ||
18114746 | 1229 | if (type == SOCK_STREAM) |
77f1f67a CL |
1230 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
1231 | error = kernel_bind(sock, sin, len); | |
18114746 ES |
1232 | if (error < 0) |
1233 | goto bummer; | |
1da177e4 | 1234 | |
9dbc240f TT |
1235 | newlen = len; |
1236 | error = kernel_getsockname(sock, newsin, &newlen); | |
1237 | if (error < 0) | |
1238 | goto bummer; | |
1239 | ||
1da177e4 | 1240 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1241 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1242 | goto bummer; |
1243 | } | |
1244 | ||
e79eff1f | 1245 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
9dbc240f | 1246 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
b700cbb1 | 1247 | return (struct svc_xprt *)svsk; |
e79eff1f | 1248 | } |
1da177e4 LT |
1249 | |
1250 | bummer: | |
1251 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1252 | sock_release(sock); | |
b700cbb1 | 1253 | return ERR_PTR(error); |
1da177e4 LT |
1254 | } |
1255 | ||
755cceab TT |
1256 | /* |
1257 | * Detach the svc_sock from the socket so that no | |
1258 | * more callbacks occur. | |
1259 | */ | |
1260 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1261 | { | |
1262 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1263 | struct sock *sk = svsk->sk_sk; | |
1264 | ||
1265 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1266 | ||
1267 | /* put back the old socket callbacks */ | |
1268 | sk->sk_state_change = svsk->sk_ostate; | |
1269 | sk->sk_data_ready = svsk->sk_odata; | |
1270 | sk->sk_write_space = svsk->sk_owspace; | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1275 | */ | |
1276 | static void svc_sock_free(struct svc_xprt *xprt) | |
1277 | { | |
1278 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1279 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1280 | ||
755cceab TT |
1281 | if (svsk->sk_sock->file) |
1282 | sockfd_put(svsk->sk_sock); | |
1283 | else | |
1284 | sock_release(svsk->sk_sock); | |
1285 | kfree(svsk); | |
1286 | } |