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 8 * svc_xprt_enqueue procedure... 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 22 #include <linux/kernel.h> 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> 30 #include <linux/tcp.h> 31 #include <linux/unistd.h> 32 #include <linux/slab.h> 33 #include <linux/netdevice.h> 34 #include <linux/skbuff.h> 35 #include <linux/file.h> 36 #include <linux/freezer.h> 37 #include <net/sock.h> 38 #include <net/checksum.h> 39 #include <net/ip.h> 40 #include <net/ipv6.h> 41 #include <net/tcp.h> 42 #include <net/tcp_states.h> 43 #include <asm/uaccess.h> 44 #include <asm/ioctls.h> 45 46 #include <linux/sunrpc/types.h> 47 #include <linux/sunrpc/clnt.h> 48 #include <linux/sunrpc/xdr.h> 49 #include <linux/sunrpc/msg_prot.h> 50 #include <linux/sunrpc/svcsock.h> 51 #include <linux/sunrpc/stats.h> 52 #include <linux/sunrpc/xprt.h> 53 54 #define RPCDBG_FACILITY RPCDBG_SVCXPRT 55 56 57 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, 58 int *errp, int flags); 59 static void svc_udp_data_ready(struct sock *, int); 60 static int svc_udp_recvfrom(struct svc_rqst *); 61 static int svc_udp_sendto(struct svc_rqst *); 62 static void svc_sock_detach(struct svc_xprt *); 63 static void svc_tcp_sock_detach(struct svc_xprt *); 64 static void svc_sock_free(struct svc_xprt *); 65 66 static struct svc_xprt *svc_create_socket(struct svc_serv *, int, 67 struct net *, struct sockaddr *, 68 int, int); 69 #if defined(CONFIG_NFS_V4_1) 70 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, 71 struct net *, struct sockaddr *, 72 int, int); 73 static void svc_bc_sock_free(struct svc_xprt *xprt); 74 #endif /* CONFIG_NFS_V4_1 */ 75 76 #ifdef CONFIG_DEBUG_LOCK_ALLOC 77 static struct lock_class_key svc_key[2]; 78 static struct lock_class_key svc_slock_key[2]; 79 80 static void svc_reclassify_socket(struct socket *sock) 81 { 82 struct sock *sk = sock->sk; 83 BUG_ON(sock_owned_by_user(sk)); 84 switch (sk->sk_family) { 85 case AF_INET: 86 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", 87 &svc_slock_key[0], 88 "sk_xprt.xpt_lock-AF_INET-NFSD", 89 &svc_key[0]); 90 break; 91 92 case AF_INET6: 93 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", 94 &svc_slock_key[1], 95 "sk_xprt.xpt_lock-AF_INET6-NFSD", 96 &svc_key[1]); 97 break; 98 99 default: 100 BUG(); 101 } 102 } 103 #else 104 static void svc_reclassify_socket(struct socket *sock) 105 { 106 } 107 #endif 108 109 /* 110 * Release an skbuff after use 111 */ 112 static void svc_release_skb(struct svc_rqst *rqstp) 113 { 114 struct sk_buff *skb = rqstp->rq_xprt_ctxt; 115 116 if (skb) { 117 struct svc_sock *svsk = 118 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 119 rqstp->rq_xprt_ctxt = NULL; 120 121 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); 122 skb_free_datagram_locked(svsk->sk_sk, skb); 123 } 124 } 125 126 union svc_pktinfo_u { 127 struct in_pktinfo pkti; 128 struct in6_pktinfo pkti6; 129 }; 130 #define SVC_PKTINFO_SPACE \ 131 CMSG_SPACE(sizeof(union svc_pktinfo_u)) 132 133 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) 134 { 135 struct svc_sock *svsk = 136 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 137 switch (svsk->sk_sk->sk_family) { 138 case AF_INET: { 139 struct in_pktinfo *pki = CMSG_DATA(cmh); 140 141 cmh->cmsg_level = SOL_IP; 142 cmh->cmsg_type = IP_PKTINFO; 143 pki->ipi_ifindex = 0; 144 pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; 145 cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); 146 } 147 break; 148 149 case AF_INET6: { 150 struct in6_pktinfo *pki = CMSG_DATA(cmh); 151 152 cmh->cmsg_level = SOL_IPV6; 153 cmh->cmsg_type = IPV6_PKTINFO; 154 pki->ipi6_ifindex = 0; 155 ipv6_addr_copy(&pki->ipi6_addr, 156 &rqstp->rq_daddr.addr6); 157 cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); 158 } 159 break; 160 } 161 } 162 163 /* 164 * send routine intended to be shared by the fore- and back-channel 165 */ 166 int svc_send_common(struct socket *sock, struct xdr_buf *xdr, 167 struct page *headpage, unsigned long headoffset, 168 struct page *tailpage, unsigned long tailoffset) 169 { 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; 176 int slen; 177 int len = 0; 178 179 slen = xdr->len; 180 181 /* send head */ 182 if (slen == xdr->head[0].iov_len) 183 flags = 0; 184 len = kernel_sendpage(sock, headpage, headoffset, 185 xdr->head[0].iov_len, flags); 186 if (len != xdr->head[0].iov_len) 187 goto out; 188 slen -= xdr->head[0].iov_len; 189 if (slen == 0) 190 goto out; 191 192 /* send page data */ 193 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; 194 while (pglen > 0) { 195 if (slen == size) 196 flags = 0; 197 result = kernel_sendpage(sock, *ppage, base, size, flags); 198 if (result > 0) 199 len += result; 200 if (result != size) 201 goto out; 202 slen -= size; 203 pglen -= size; 204 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; 205 base = 0; 206 ppage++; 207 } 208 209 /* send tail */ 210 if (xdr->tail[0].iov_len) { 211 result = kernel_sendpage(sock, tailpage, tailoffset, 212 xdr->tail[0].iov_len, 0); 213 if (result > 0) 214 len += result; 215 } 216 217 out: 218 return len; 219 } 220 221 222 /* 223 * Generic sendto routine 224 */ 225 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) 226 { 227 struct svc_sock *svsk = 228 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 229 struct socket *sock = svsk->sk_sock; 230 union { 231 struct cmsghdr hdr; 232 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 233 } buffer; 234 struct cmsghdr *cmh = &buffer.hdr; 235 int len = 0; 236 unsigned long tailoff; 237 unsigned long headoff; 238 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 239 240 if (rqstp->rq_prot == IPPROTO_UDP) { 241 struct msghdr msg = { 242 .msg_name = &rqstp->rq_addr, 243 .msg_namelen = rqstp->rq_addrlen, 244 .msg_control = cmh, 245 .msg_controllen = sizeof(buffer), 246 .msg_flags = MSG_MORE, 247 }; 248 249 svc_set_cmsg_data(rqstp, cmh); 250 251 if (sock_sendmsg(sock, &msg, 0) < 0) 252 goto out; 253 } 254 255 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); 256 headoff = 0; 257 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, 258 rqstp->rq_respages[0], tailoff); 259 260 out: 261 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", 262 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, 263 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); 264 265 return len; 266 } 267 268 /* 269 * Report socket names for nfsdfs 270 */ 271 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) 272 { 273 const struct sock *sk = svsk->sk_sk; 274 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? 275 "udp" : "tcp"; 276 int len; 277 278 switch (sk->sk_family) { 279 case PF_INET: 280 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", 281 proto_name, 282 &inet_sk(sk)->inet_rcv_saddr, 283 inet_sk(sk)->inet_num); 284 break; 285 case PF_INET6: 286 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", 287 proto_name, 288 &inet6_sk(sk)->rcv_saddr, 289 inet_sk(sk)->inet_num); 290 break; 291 default: 292 len = snprintf(buf, remaining, "*unknown-%d*\n", 293 sk->sk_family); 294 } 295 296 if (len >= remaining) { 297 *buf = '\0'; 298 return -ENAMETOOLONG; 299 } 300 return len; 301 } 302 303 /** 304 * svc_sock_names - construct a list of listener names in a string 305 * @serv: pointer to RPC service 306 * @buf: pointer to a buffer to fill in with socket names 307 * @buflen: size of the buffer to be filled 308 * @toclose: pointer to '\0'-terminated C string containing the name 309 * of a listener to be closed 310 * 311 * Fills in @buf with a '\n'-separated list of names of listener 312 * sockets. If @toclose is not NULL, the socket named by @toclose 313 * is closed, and is not included in the output list. 314 * 315 * Returns positive length of the socket name string, or a negative 316 * errno value on error. 317 */ 318 int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen, 319 const char *toclose) 320 { 321 struct svc_sock *svsk, *closesk = NULL; 322 int len = 0; 323 324 if (!serv) 325 return 0; 326 327 spin_lock_bh(&serv->sv_lock); 328 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { 329 int onelen = svc_one_sock_name(svsk, buf + len, buflen - len); 330 if (onelen < 0) { 331 len = onelen; 332 break; 333 } 334 if (toclose && strcmp(toclose, buf + len) == 0) { 335 closesk = svsk; 336 svc_xprt_get(&closesk->sk_xprt); 337 } else 338 len += onelen; 339 } 340 spin_unlock_bh(&serv->sv_lock); 341 342 if (closesk) { 343 /* Should unregister with portmap, but you cannot 344 * unregister just one protocol... 345 */ 346 svc_close_xprt(&closesk->sk_xprt); 347 svc_xprt_put(&closesk->sk_xprt); 348 } else if (toclose) 349 return -ENOENT; 350 return len; 351 } 352 EXPORT_SYMBOL_GPL(svc_sock_names); 353 354 /* 355 * Check input queue length 356 */ 357 static int svc_recv_available(struct svc_sock *svsk) 358 { 359 struct socket *sock = svsk->sk_sock; 360 int avail, err; 361 362 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); 363 364 return (err >= 0)? avail : err; 365 } 366 367 /* 368 * Generic recvfrom routine. 369 */ 370 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, 371 int buflen) 372 { 373 struct svc_sock *svsk = 374 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 375 struct msghdr msg = { 376 .msg_flags = MSG_DONTWAIT, 377 }; 378 int len; 379 380 rqstp->rq_xprt_hlen = 0; 381 382 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, 383 msg.msg_flags); 384 385 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", 386 svsk, iov[0].iov_base, iov[0].iov_len, len); 387 return len; 388 } 389 390 static int svc_partial_recvfrom(struct svc_rqst *rqstp, 391 struct kvec *iov, int nr, 392 int buflen, unsigned int base) 393 { 394 size_t save_iovlen; 395 void __user *save_iovbase; 396 unsigned int i; 397 int ret; 398 399 if (base == 0) 400 return svc_recvfrom(rqstp, iov, nr, buflen); 401 402 for (i = 0; i < nr; i++) { 403 if (iov[i].iov_len > base) 404 break; 405 base -= iov[i].iov_len; 406 } 407 save_iovlen = iov[i].iov_len; 408 save_iovbase = iov[i].iov_base; 409 iov[i].iov_len -= base; 410 iov[i].iov_base += base; 411 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); 412 iov[i].iov_len = save_iovlen; 413 iov[i].iov_base = save_iovbase; 414 return ret; 415 } 416 417 /* 418 * Set socket snd and rcv buffer lengths 419 */ 420 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, 421 unsigned int rcv) 422 { 423 #if 0 424 mm_segment_t oldfs; 425 oldfs = get_fs(); set_fs(KERNEL_DS); 426 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, 427 (char*)&snd, sizeof(snd)); 428 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 429 (char*)&rcv, sizeof(rcv)); 430 #else 431 /* sock_setsockopt limits use to sysctl_?mem_max, 432 * which isn't acceptable. Until that is made conditional 433 * on not having CAP_SYS_RESOURCE or similar, we go direct... 434 * DaveM said I could! 435 */ 436 lock_sock(sock->sk); 437 sock->sk->sk_sndbuf = snd * 2; 438 sock->sk->sk_rcvbuf = rcv * 2; 439 sock->sk->sk_write_space(sock->sk); 440 release_sock(sock->sk); 441 #endif 442 } 443 /* 444 * INET callback when data has been received on the socket. 445 */ 446 static void svc_udp_data_ready(struct sock *sk, int count) 447 { 448 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 449 wait_queue_head_t *wq = sk_sleep(sk); 450 451 if (svsk) { 452 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", 453 svsk, sk, count, 454 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 455 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 456 svc_xprt_enqueue(&svsk->sk_xprt); 457 } 458 if (wq && waitqueue_active(wq)) 459 wake_up_interruptible(wq); 460 } 461 462 /* 463 * INET callback when space is newly available on the socket. 464 */ 465 static void svc_write_space(struct sock *sk) 466 { 467 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); 468 wait_queue_head_t *wq = sk_sleep(sk); 469 470 if (svsk) { 471 dprintk("svc: socket %p(inet %p), write_space busy=%d\n", 472 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 473 svc_xprt_enqueue(&svsk->sk_xprt); 474 } 475 476 if (wq && waitqueue_active(wq)) { 477 dprintk("RPC svc_write_space: someone sleeping on %p\n", 478 svsk); 479 wake_up_interruptible(wq); 480 } 481 } 482 483 static void svc_tcp_write_space(struct sock *sk) 484 { 485 struct socket *sock = sk->sk_socket; 486 487 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) 488 clear_bit(SOCK_NOSPACE, &sock->flags); 489 svc_write_space(sk); 490 } 491 492 /* 493 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo 494 */ 495 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, 496 struct cmsghdr *cmh) 497 { 498 struct in_pktinfo *pki = CMSG_DATA(cmh); 499 if (cmh->cmsg_type != IP_PKTINFO) 500 return 0; 501 rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; 502 return 1; 503 } 504 505 /* 506 * See net/ipv6/datagram.c : datagram_recv_ctl 507 */ 508 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, 509 struct cmsghdr *cmh) 510 { 511 struct in6_pktinfo *pki = CMSG_DATA(cmh); 512 if (cmh->cmsg_type != IPV6_PKTINFO) 513 return 0; 514 ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); 515 return 1; 516 } 517 518 /* 519 * Copy the UDP datagram's destination address to the rqstp structure. 520 * The 'destination' address in this case is the address to which the 521 * peer sent the datagram, i.e. our local address. For multihomed 522 * hosts, this can change from msg to msg. Note that only the IP 523 * address changes, the port number should remain the same. 524 */ 525 static int svc_udp_get_dest_address(struct svc_rqst *rqstp, 526 struct cmsghdr *cmh) 527 { 528 switch (cmh->cmsg_level) { 529 case SOL_IP: 530 return svc_udp_get_dest_address4(rqstp, cmh); 531 case SOL_IPV6: 532 return svc_udp_get_dest_address6(rqstp, cmh); 533 } 534 535 return 0; 536 } 537 538 /* 539 * Receive a datagram from a UDP socket. 540 */ 541 static int svc_udp_recvfrom(struct svc_rqst *rqstp) 542 { 543 struct svc_sock *svsk = 544 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 545 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 546 struct sk_buff *skb; 547 union { 548 struct cmsghdr hdr; 549 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 550 } buffer; 551 struct cmsghdr *cmh = &buffer.hdr; 552 struct msghdr msg = { 553 .msg_name = svc_addr(rqstp), 554 .msg_control = cmh, 555 .msg_controllen = sizeof(buffer), 556 .msg_flags = MSG_DONTWAIT, 557 }; 558 size_t len; 559 int err; 560 561 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) 562 /* udp sockets need large rcvbuf as all pending 563 * requests are still in that buffer. sndbuf must 564 * also be large enough that there is enough space 565 * for one reply per thread. We count all threads 566 * rather than threads in a particular pool, which 567 * provides an upper bound on the number of threads 568 * which will access the socket. 569 */ 570 svc_sock_setbufsize(svsk->sk_sock, 571 (serv->sv_nrthreads+3) * serv->sv_max_mesg, 572 (serv->sv_nrthreads+3) * serv->sv_max_mesg); 573 574 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 575 skb = NULL; 576 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, 577 0, 0, MSG_PEEK | MSG_DONTWAIT); 578 if (err >= 0) 579 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); 580 581 if (skb == NULL) { 582 if (err != -EAGAIN) { 583 /* possibly an icmp error */ 584 dprintk("svc: recvfrom returned error %d\n", -err); 585 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 586 } 587 return -EAGAIN; 588 } 589 len = svc_addr_len(svc_addr(rqstp)); 590 if (len == 0) 591 return -EAFNOSUPPORT; 592 rqstp->rq_addrlen = len; 593 if (skb->tstamp.tv64 == 0) { 594 skb->tstamp = ktime_get_real(); 595 /* Don't enable netstamp, sunrpc doesn't 596 need that much accuracy */ 597 } 598 svsk->sk_sk->sk_stamp = skb->tstamp; 599 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ 600 601 len = skb->len - sizeof(struct udphdr); 602 rqstp->rq_arg.len = len; 603 604 rqstp->rq_prot = IPPROTO_UDP; 605 606 if (!svc_udp_get_dest_address(rqstp, cmh)) { 607 if (net_ratelimit()) 608 printk(KERN_WARNING 609 "svc: received unknown control message %d/%d; " 610 "dropping RPC reply datagram\n", 611 cmh->cmsg_level, cmh->cmsg_type); 612 skb_free_datagram_locked(svsk->sk_sk, skb); 613 return 0; 614 } 615 616 if (skb_is_nonlinear(skb)) { 617 /* we have to copy */ 618 local_bh_disable(); 619 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { 620 local_bh_enable(); 621 /* checksum error */ 622 skb_free_datagram_locked(svsk->sk_sk, skb); 623 return 0; 624 } 625 local_bh_enable(); 626 skb_free_datagram_locked(svsk->sk_sk, skb); 627 } else { 628 /* we can use it in-place */ 629 rqstp->rq_arg.head[0].iov_base = skb->data + 630 sizeof(struct udphdr); 631 rqstp->rq_arg.head[0].iov_len = len; 632 if (skb_checksum_complete(skb)) { 633 skb_free_datagram_locked(svsk->sk_sk, skb); 634 return 0; 635 } 636 rqstp->rq_xprt_ctxt = skb; 637 } 638 639 rqstp->rq_arg.page_base = 0; 640 if (len <= rqstp->rq_arg.head[0].iov_len) { 641 rqstp->rq_arg.head[0].iov_len = len; 642 rqstp->rq_arg.page_len = 0; 643 rqstp->rq_respages = rqstp->rq_pages+1; 644 } else { 645 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; 646 rqstp->rq_respages = rqstp->rq_pages + 1 + 647 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); 648 } 649 650 if (serv->sv_stats) 651 serv->sv_stats->netudpcnt++; 652 653 return len; 654 } 655 656 static int 657 svc_udp_sendto(struct svc_rqst *rqstp) 658 { 659 int error; 660 661 error = svc_sendto(rqstp, &rqstp->rq_res); 662 if (error == -ECONNREFUSED) 663 /* ICMP error on earlier request. */ 664 error = svc_sendto(rqstp, &rqstp->rq_res); 665 666 return error; 667 } 668 669 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) 670 { 671 } 672 673 static int svc_udp_has_wspace(struct svc_xprt *xprt) 674 { 675 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 676 struct svc_serv *serv = xprt->xpt_server; 677 unsigned long required; 678 679 /* 680 * Set the SOCK_NOSPACE flag before checking the available 681 * sock space. 682 */ 683 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 684 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; 685 if (required*2 > sock_wspace(svsk->sk_sk)) 686 return 0; 687 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 688 return 1; 689 } 690 691 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) 692 { 693 BUG(); 694 return NULL; 695 } 696 697 static struct svc_xprt *svc_udp_create(struct svc_serv *serv, 698 struct net *net, 699 struct sockaddr *sa, int salen, 700 int flags) 701 { 702 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); 703 } 704 705 static struct svc_xprt_ops svc_udp_ops = { 706 .xpo_create = svc_udp_create, 707 .xpo_recvfrom = svc_udp_recvfrom, 708 .xpo_sendto = svc_udp_sendto, 709 .xpo_release_rqst = svc_release_skb, 710 .xpo_detach = svc_sock_detach, 711 .xpo_free = svc_sock_free, 712 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, 713 .xpo_has_wspace = svc_udp_has_wspace, 714 .xpo_accept = svc_udp_accept, 715 }; 716 717 static struct svc_xprt_class svc_udp_class = { 718 .xcl_name = "udp", 719 .xcl_owner = THIS_MODULE, 720 .xcl_ops = &svc_udp_ops, 721 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, 722 }; 723 724 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) 725 { 726 int err, level, optname, one = 1; 727 728 svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); 729 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 730 svsk->sk_sk->sk_data_ready = svc_udp_data_ready; 731 svsk->sk_sk->sk_write_space = svc_write_space; 732 733 /* initialise setting must have enough space to 734 * receive and respond to one request. 735 * svc_udp_recvfrom will re-adjust if necessary 736 */ 737 svc_sock_setbufsize(svsk->sk_sock, 738 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, 739 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); 740 741 /* data might have come in before data_ready set up */ 742 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 743 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 744 745 /* make sure we get destination address info */ 746 switch (svsk->sk_sk->sk_family) { 747 case AF_INET: 748 level = SOL_IP; 749 optname = IP_PKTINFO; 750 break; 751 case AF_INET6: 752 level = SOL_IPV6; 753 optname = IPV6_RECVPKTINFO; 754 break; 755 default: 756 BUG(); 757 } 758 err = kernel_setsockopt(svsk->sk_sock, level, optname, 759 (char *)&one, sizeof(one)); 760 dprintk("svc: kernel_setsockopt returned %d\n", err); 761 } 762 763 /* 764 * A data_ready event on a listening socket means there's a connection 765 * pending. Do not use state_change as a substitute for it. 766 */ 767 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) 768 { 769 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 770 wait_queue_head_t *wq; 771 772 dprintk("svc: socket %p TCP (listen) state change %d\n", 773 sk, sk->sk_state); 774 775 /* 776 * This callback may called twice when a new connection 777 * is established as a child socket inherits everything 778 * from a parent LISTEN socket. 779 * 1) data_ready method of the parent socket will be called 780 * when one of child sockets become ESTABLISHED. 781 * 2) data_ready method of the child socket may be called 782 * when it receives data before the socket is accepted. 783 * In case of 2, we should ignore it silently. 784 */ 785 if (sk->sk_state == TCP_LISTEN) { 786 if (svsk) { 787 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 788 svc_xprt_enqueue(&svsk->sk_xprt); 789 } else 790 printk("svc: socket %p: no user data\n", sk); 791 } 792 793 wq = sk_sleep(sk); 794 if (wq && waitqueue_active(wq)) 795 wake_up_interruptible_all(wq); 796 } 797 798 /* 799 * A state change on a connected socket means it's dying or dead. 800 */ 801 static void svc_tcp_state_change(struct sock *sk) 802 { 803 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 804 wait_queue_head_t *wq = sk_sleep(sk); 805 806 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", 807 sk, sk->sk_state, sk->sk_user_data); 808 809 if (!svsk) 810 printk("svc: socket %p: no user data\n", sk); 811 else { 812 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 813 svc_xprt_enqueue(&svsk->sk_xprt); 814 } 815 if (wq && waitqueue_active(wq)) 816 wake_up_interruptible_all(wq); 817 } 818 819 static void svc_tcp_data_ready(struct sock *sk, int count) 820 { 821 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 822 wait_queue_head_t *wq = sk_sleep(sk); 823 824 dprintk("svc: socket %p TCP data ready (svsk %p)\n", 825 sk, sk->sk_user_data); 826 if (svsk) { 827 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 828 svc_xprt_enqueue(&svsk->sk_xprt); 829 } 830 if (wq && waitqueue_active(wq)) 831 wake_up_interruptible(wq); 832 } 833 834 /* 835 * Accept a TCP connection 836 */ 837 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) 838 { 839 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 840 struct sockaddr_storage addr; 841 struct sockaddr *sin = (struct sockaddr *) &addr; 842 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 843 struct socket *sock = svsk->sk_sock; 844 struct socket *newsock; 845 struct svc_sock *newsvsk; 846 int err, slen; 847 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 848 849 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); 850 if (!sock) 851 return NULL; 852 853 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 854 err = kernel_accept(sock, &newsock, O_NONBLOCK); 855 if (err < 0) { 856 if (err == -ENOMEM) 857 printk(KERN_WARNING "%s: no more sockets!\n", 858 serv->sv_name); 859 else if (err != -EAGAIN && net_ratelimit()) 860 printk(KERN_WARNING "%s: accept failed (err %d)!\n", 861 serv->sv_name, -err); 862 return NULL; 863 } 864 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 865 866 err = kernel_getpeername(newsock, sin, &slen); 867 if (err < 0) { 868 if (net_ratelimit()) 869 printk(KERN_WARNING "%s: peername failed (err %d)!\n", 870 serv->sv_name, -err); 871 goto failed; /* aborted connection or whatever */ 872 } 873 874 /* Ideally, we would want to reject connections from unauthorized 875 * hosts here, but when we get encryption, the IP of the host won't 876 * tell us anything. For now just warn about unpriv connections. 877 */ 878 if (!svc_port_is_privileged(sin)) { 879 dprintk(KERN_WARNING 880 "%s: connect from unprivileged port: %s\n", 881 serv->sv_name, 882 __svc_print_addr(sin, buf, sizeof(buf))); 883 } 884 dprintk("%s: connect from %s\n", serv->sv_name, 885 __svc_print_addr(sin, buf, sizeof(buf))); 886 887 /* make sure that a write doesn't block forever when 888 * low on memory 889 */ 890 newsock->sk->sk_sndtimeo = HZ*30; 891 892 if (!(newsvsk = svc_setup_socket(serv, newsock, &err, 893 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) 894 goto failed; 895 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); 896 err = kernel_getsockname(newsock, sin, &slen); 897 if (unlikely(err < 0)) { 898 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); 899 slen = offsetof(struct sockaddr, sa_data); 900 } 901 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); 902 903 if (serv->sv_stats) 904 serv->sv_stats->nettcpconn++; 905 906 return &newsvsk->sk_xprt; 907 908 failed: 909 sock_release(newsock); 910 return NULL; 911 } 912 913 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 914 { 915 unsigned int i, len, npages; 916 917 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 918 return 0; 919 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 920 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 921 for (i = 0; i < npages; i++) { 922 if (rqstp->rq_pages[i] != NULL) 923 put_page(rqstp->rq_pages[i]); 924 BUG_ON(svsk->sk_pages[i] == NULL); 925 rqstp->rq_pages[i] = svsk->sk_pages[i]; 926 svsk->sk_pages[i] = NULL; 927 } 928 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); 929 return len; 930 } 931 932 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 933 { 934 unsigned int i, len, npages; 935 936 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 937 return; 938 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 939 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 940 for (i = 0; i < npages; i++) { 941 svsk->sk_pages[i] = rqstp->rq_pages[i]; 942 rqstp->rq_pages[i] = NULL; 943 } 944 } 945 946 static void svc_tcp_clear_pages(struct svc_sock *svsk) 947 { 948 unsigned int i, len, npages; 949 950 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 951 goto out; 952 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 953 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 954 for (i = 0; i < npages; i++) { 955 BUG_ON(svsk->sk_pages[i] == NULL); 956 put_page(svsk->sk_pages[i]); 957 svsk->sk_pages[i] = NULL; 958 } 959 out: 960 svsk->sk_tcplen = 0; 961 } 962 963 /* 964 * Receive data. 965 * If we haven't gotten the record length yet, get the next four bytes. 966 * Otherwise try to gobble up as much as possible up to the complete 967 * record length. 968 */ 969 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 970 { 971 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 972 unsigned int want; 973 int len; 974 975 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 976 977 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { 978 struct kvec iov; 979 980 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; 981 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; 982 iov.iov_len = want; 983 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) 984 goto error; 985 svsk->sk_tcplen += len; 986 987 if (len < want) { 988 dprintk("svc: short recvfrom while reading record " 989 "length (%d of %d)\n", len, want); 990 return -EAGAIN; 991 } 992 993 svsk->sk_reclen = ntohl(svsk->sk_reclen); 994 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { 995 /* FIXME: technically, a record can be fragmented, 996 * and non-terminal fragments will not have the top 997 * bit set in the fragment length header. 998 * But apparently no known nfs clients send fragmented 999 * records. */ 1000 if (net_ratelimit()) 1001 printk(KERN_NOTICE "RPC: multiple fragments " 1002 "per record not supported\n"); 1003 goto err_delete; 1004 } 1005 1006 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; 1007 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); 1008 if (svsk->sk_reclen > serv->sv_max_mesg) { 1009 if (net_ratelimit()) 1010 printk(KERN_NOTICE "RPC: " 1011 "fragment too large: 0x%08lx\n", 1012 (unsigned long)svsk->sk_reclen); 1013 goto err_delete; 1014 } 1015 } 1016 1017 if (svsk->sk_reclen < 8) 1018 goto err_delete; /* client is nuts. */ 1019 1020 len = svsk->sk_reclen; 1021 1022 return len; 1023 error: 1024 dprintk("RPC: TCP recv_record got %d\n", len); 1025 return len; 1026 err_delete: 1027 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1028 return -EAGAIN; 1029 } 1030 1031 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) 1032 { 1033 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; 1034 struct rpc_rqst *req = NULL; 1035 struct kvec *src, *dst; 1036 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 1037 __be32 xid; 1038 __be32 calldir; 1039 1040 xid = *p++; 1041 calldir = *p; 1042 1043 if (bc_xprt) 1044 req = xprt_lookup_rqst(bc_xprt, xid); 1045 1046 if (!req) { 1047 printk(KERN_NOTICE 1048 "%s: Got unrecognized reply: " 1049 "calldir 0x%x xpt_bc_xprt %p xid %08x\n", 1050 __func__, ntohl(calldir), 1051 bc_xprt, xid); 1052 return -EAGAIN; 1053 } 1054 1055 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); 1056 /* 1057 * XXX!: cheating for now! Only copying HEAD. 1058 * But we know this is good enough for now (in fact, for any 1059 * callback reply in the forseeable future). 1060 */ 1061 dst = &req->rq_private_buf.head[0]; 1062 src = &rqstp->rq_arg.head[0]; 1063 if (dst->iov_len < src->iov_len) 1064 return -EAGAIN; /* whatever; just giving up. */ 1065 memcpy(dst->iov_base, src->iov_base, src->iov_len); 1066 xprt_complete_rqst(req->rq_task, svsk->sk_reclen); 1067 rqstp->rq_arg.len = 0; 1068 return 0; 1069 } 1070 1071 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) 1072 { 1073 int i = 0; 1074 int t = 0; 1075 1076 while (t < len) { 1077 vec[i].iov_base = page_address(pages[i]); 1078 vec[i].iov_len = PAGE_SIZE; 1079 i++; 1080 t += PAGE_SIZE; 1081 } 1082 return i; 1083 } 1084 1085 1086 /* 1087 * Receive data from a TCP socket. 1088 */ 1089 static int svc_tcp_recvfrom(struct svc_rqst *rqstp) 1090 { 1091 struct svc_sock *svsk = 1092 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 1093 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1094 int len; 1095 struct kvec *vec; 1096 unsigned int want, base; 1097 __be32 *p; 1098 __be32 calldir; 1099 int pnum; 1100 1101 dprintk("svc: tcp_recv %p data %d conn %d close %d\n", 1102 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), 1103 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), 1104 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); 1105 1106 len = svc_tcp_recv_record(svsk, rqstp); 1107 if (len < 0) 1108 goto error; 1109 1110 base = svc_tcp_restore_pages(svsk, rqstp); 1111 want = svsk->sk_reclen - base; 1112 1113 vec = rqstp->rq_vec; 1114 1115 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], 1116 svsk->sk_reclen); 1117 1118 rqstp->rq_respages = &rqstp->rq_pages[pnum]; 1119 1120 /* Now receive data */ 1121 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); 1122 if (len >= 0) 1123 svsk->sk_tcplen += len; 1124 if (len != want) { 1125 if (len < 0 && len != -EAGAIN) 1126 goto err_other; 1127 svc_tcp_save_pages(svsk, rqstp); 1128 dprintk("svc: incomplete TCP record (%d of %d)\n", 1129 svsk->sk_tcplen, svsk->sk_reclen); 1130 goto err_noclose; 1131 } 1132 1133 rqstp->rq_arg.len = svsk->sk_reclen; 1134 rqstp->rq_arg.page_base = 0; 1135 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { 1136 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; 1137 rqstp->rq_arg.page_len = 0; 1138 } else 1139 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 1140 1141 rqstp->rq_xprt_ctxt = NULL; 1142 rqstp->rq_prot = IPPROTO_TCP; 1143 1144 p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 1145 calldir = p[1]; 1146 if (calldir) 1147 len = receive_cb_reply(svsk, rqstp); 1148 1149 /* Reset TCP read info */ 1150 svsk->sk_reclen = 0; 1151 svsk->sk_tcplen = 0; 1152 /* If we have more data, signal svc_xprt_enqueue() to try again */ 1153 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) 1154 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1155 1156 if (len < 0) 1157 goto error; 1158 1159 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); 1160 if (serv->sv_stats) 1161 serv->sv_stats->nettcpcnt++; 1162 1163 dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); 1164 return rqstp->rq_arg.len; 1165 1166 error: 1167 if (len != -EAGAIN) 1168 goto err_other; 1169 dprintk("RPC: TCP recvfrom got EAGAIN\n"); 1170 return -EAGAIN; 1171 err_other: 1172 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", 1173 svsk->sk_xprt.xpt_server->sv_name, -len); 1174 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1175 err_noclose: 1176 return -EAGAIN; /* record not complete */ 1177 } 1178 1179 /* 1180 * Send out data on TCP socket. 1181 */ 1182 static int svc_tcp_sendto(struct svc_rqst *rqstp) 1183 { 1184 struct xdr_buf *xbufp = &rqstp->rq_res; 1185 int sent; 1186 __be32 reclen; 1187 1188 /* Set up the first element of the reply kvec. 1189 * Any other kvecs that may be in use have been taken 1190 * care of by the server implementation itself. 1191 */ 1192 reclen = htonl(0x80000000|((xbufp->len ) - 4)); 1193 memcpy(xbufp->head[0].iov_base, &reclen, 4); 1194 1195 sent = svc_sendto(rqstp, &rqstp->rq_res); 1196 if (sent != xbufp->len) { 1197 printk(KERN_NOTICE 1198 "rpc-srv/tcp: %s: %s %d when sending %d bytes " 1199 "- shutting down socket\n", 1200 rqstp->rq_xprt->xpt_server->sv_name, 1201 (sent<0)?"got error":"sent only", 1202 sent, xbufp->len); 1203 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); 1204 svc_xprt_enqueue(rqstp->rq_xprt); 1205 sent = -EAGAIN; 1206 } 1207 return sent; 1208 } 1209 1210 /* 1211 * Setup response header. TCP has a 4B record length field. 1212 */ 1213 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) 1214 { 1215 struct kvec *resv = &rqstp->rq_res.head[0]; 1216 1217 /* tcp needs a space for the record length... */ 1218 svc_putnl(resv, 0); 1219 } 1220 1221 static int svc_tcp_has_wspace(struct svc_xprt *xprt) 1222 { 1223 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1224 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1225 int required; 1226 1227 if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) 1228 return 1; 1229 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; 1230 if (sk_stream_wspace(svsk->sk_sk) >= required) 1231 return 1; 1232 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 1233 return 0; 1234 } 1235 1236 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, 1237 struct net *net, 1238 struct sockaddr *sa, int salen, 1239 int flags) 1240 { 1241 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1242 } 1243 1244 #if defined(CONFIG_NFS_V4_1) 1245 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, 1246 struct net *, struct sockaddr *, 1247 int, int); 1248 static void svc_bc_sock_free(struct svc_xprt *xprt); 1249 1250 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, 1251 struct net *net, 1252 struct sockaddr *sa, int salen, 1253 int flags) 1254 { 1255 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1256 } 1257 1258 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) 1259 { 1260 } 1261 1262 static struct svc_xprt_ops svc_tcp_bc_ops = { 1263 .xpo_create = svc_bc_tcp_create, 1264 .xpo_detach = svc_bc_tcp_sock_detach, 1265 .xpo_free = svc_bc_sock_free, 1266 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1267 }; 1268 1269 static struct svc_xprt_class svc_tcp_bc_class = { 1270 .xcl_name = "tcp-bc", 1271 .xcl_owner = THIS_MODULE, 1272 .xcl_ops = &svc_tcp_bc_ops, 1273 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1274 }; 1275 1276 static void svc_init_bc_xprt_sock(void) 1277 { 1278 svc_reg_xprt_class(&svc_tcp_bc_class); 1279 } 1280 1281 static void svc_cleanup_bc_xprt_sock(void) 1282 { 1283 svc_unreg_xprt_class(&svc_tcp_bc_class); 1284 } 1285 #else /* CONFIG_NFS_V4_1 */ 1286 static void svc_init_bc_xprt_sock(void) 1287 { 1288 } 1289 1290 static void svc_cleanup_bc_xprt_sock(void) 1291 { 1292 } 1293 #endif /* CONFIG_NFS_V4_1 */ 1294 1295 static struct svc_xprt_ops svc_tcp_ops = { 1296 .xpo_create = svc_tcp_create, 1297 .xpo_recvfrom = svc_tcp_recvfrom, 1298 .xpo_sendto = svc_tcp_sendto, 1299 .xpo_release_rqst = svc_release_skb, 1300 .xpo_detach = svc_tcp_sock_detach, 1301 .xpo_free = svc_sock_free, 1302 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1303 .xpo_has_wspace = svc_tcp_has_wspace, 1304 .xpo_accept = svc_tcp_accept, 1305 }; 1306 1307 static struct svc_xprt_class svc_tcp_class = { 1308 .xcl_name = "tcp", 1309 .xcl_owner = THIS_MODULE, 1310 .xcl_ops = &svc_tcp_ops, 1311 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1312 }; 1313 1314 void svc_init_xprt_sock(void) 1315 { 1316 svc_reg_xprt_class(&svc_tcp_class); 1317 svc_reg_xprt_class(&svc_udp_class); 1318 svc_init_bc_xprt_sock(); 1319 } 1320 1321 void svc_cleanup_xprt_sock(void) 1322 { 1323 svc_unreg_xprt_class(&svc_tcp_class); 1324 svc_unreg_xprt_class(&svc_udp_class); 1325 svc_cleanup_bc_xprt_sock(); 1326 } 1327 1328 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) 1329 { 1330 struct sock *sk = svsk->sk_sk; 1331 1332 svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); 1333 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 1334 if (sk->sk_state == TCP_LISTEN) { 1335 dprintk("setting up TCP socket for listening\n"); 1336 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); 1337 sk->sk_data_ready = svc_tcp_listen_data_ready; 1338 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 1339 } else { 1340 dprintk("setting up TCP socket for reading\n"); 1341 sk->sk_state_change = svc_tcp_state_change; 1342 sk->sk_data_ready = svc_tcp_data_ready; 1343 sk->sk_write_space = svc_tcp_write_space; 1344 1345 svsk->sk_reclen = 0; 1346 svsk->sk_tcplen = 0; 1347 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); 1348 1349 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1350 1351 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1352 if (sk->sk_state != TCP_ESTABLISHED) 1353 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1354 } 1355 } 1356 1357 void svc_sock_update_bufs(struct svc_serv *serv) 1358 { 1359 /* 1360 * The number of server threads has changed. Update 1361 * rcvbuf and sndbuf accordingly on all sockets 1362 */ 1363 struct svc_sock *svsk; 1364 1365 spin_lock_bh(&serv->sv_lock); 1366 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) 1367 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 1368 list_for_each_entry(svsk, &serv->sv_tempsocks, sk_xprt.xpt_list) 1369 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 1370 spin_unlock_bh(&serv->sv_lock); 1371 } 1372 EXPORT_SYMBOL_GPL(svc_sock_update_bufs); 1373 1374 /* 1375 * Initialize socket for RPC use and create svc_sock struct 1376 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. 1377 */ 1378 static struct svc_sock *svc_setup_socket(struct svc_serv *serv, 1379 struct socket *sock, 1380 int *errp, int flags) 1381 { 1382 struct svc_sock *svsk; 1383 struct sock *inet; 1384 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); 1385 1386 dprintk("svc: svc_setup_socket %p\n", sock); 1387 if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { 1388 *errp = -ENOMEM; 1389 return NULL; 1390 } 1391 1392 inet = sock->sk; 1393 1394 /* Register socket with portmapper */ 1395 if (*errp >= 0 && pmap_register) 1396 *errp = svc_register(serv, inet->sk_family, inet->sk_protocol, 1397 ntohs(inet_sk(inet)->inet_sport)); 1398 1399 if (*errp < 0) { 1400 kfree(svsk); 1401 return NULL; 1402 } 1403 1404 inet->sk_user_data = svsk; 1405 svsk->sk_sock = sock; 1406 svsk->sk_sk = inet; 1407 svsk->sk_ostate = inet->sk_state_change; 1408 svsk->sk_odata = inet->sk_data_ready; 1409 svsk->sk_owspace = inet->sk_write_space; 1410 1411 /* Initialize the socket */ 1412 if (sock->type == SOCK_DGRAM) 1413 svc_udp_init(svsk, serv); 1414 else { 1415 /* initialise setting must have enough space to 1416 * receive and respond to one request. 1417 */ 1418 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, 1419 4 * serv->sv_max_mesg); 1420 svc_tcp_init(svsk, serv); 1421 } 1422 1423 dprintk("svc: svc_setup_socket created %p (inet %p)\n", 1424 svsk, svsk->sk_sk); 1425 1426 return svsk; 1427 } 1428 1429 /** 1430 * svc_addsock - add a listener socket to an RPC service 1431 * @serv: pointer to RPC service to which to add a new listener 1432 * @fd: file descriptor of the new listener 1433 * @name_return: pointer to buffer to fill in with name of listener 1434 * @len: size of the buffer 1435 * 1436 * Fills in socket name and returns positive length of name if successful. 1437 * Name is terminated with '\n'. On error, returns a negative errno 1438 * value. 1439 */ 1440 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, 1441 const size_t len) 1442 { 1443 int err = 0; 1444 struct socket *so = sockfd_lookup(fd, &err); 1445 struct svc_sock *svsk = NULL; 1446 1447 if (!so) 1448 return err; 1449 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) 1450 err = -EAFNOSUPPORT; 1451 else if (so->sk->sk_protocol != IPPROTO_TCP && 1452 so->sk->sk_protocol != IPPROTO_UDP) 1453 err = -EPROTONOSUPPORT; 1454 else if (so->state > SS_UNCONNECTED) 1455 err = -EISCONN; 1456 else { 1457 if (!try_module_get(THIS_MODULE)) 1458 err = -ENOENT; 1459 else 1460 svsk = svc_setup_socket(serv, so, &err, 1461 SVC_SOCK_DEFAULTS); 1462 if (svsk) { 1463 struct sockaddr_storage addr; 1464 struct sockaddr *sin = (struct sockaddr *)&addr; 1465 int salen; 1466 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) 1467 svc_xprt_set_local(&svsk->sk_xprt, sin, salen); 1468 clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); 1469 spin_lock_bh(&serv->sv_lock); 1470 list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); 1471 spin_unlock_bh(&serv->sv_lock); 1472 svc_xprt_received(&svsk->sk_xprt); 1473 err = 0; 1474 } else 1475 module_put(THIS_MODULE); 1476 } 1477 if (err) { 1478 sockfd_put(so); 1479 return err; 1480 } 1481 return svc_one_sock_name(svsk, name_return, len); 1482 } 1483 EXPORT_SYMBOL_GPL(svc_addsock); 1484 1485 /* 1486 * Create socket for RPC service. 1487 */ 1488 static struct svc_xprt *svc_create_socket(struct svc_serv *serv, 1489 int protocol, 1490 struct net *net, 1491 struct sockaddr *sin, int len, 1492 int flags) 1493 { 1494 struct svc_sock *svsk; 1495 struct socket *sock; 1496 int error; 1497 int type; 1498 struct sockaddr_storage addr; 1499 struct sockaddr *newsin = (struct sockaddr *)&addr; 1500 int newlen; 1501 int family; 1502 int val; 1503 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 1504 1505 dprintk("svc: svc_create_socket(%s, %d, %s)\n", 1506 serv->sv_program->pg_name, protocol, 1507 __svc_print_addr(sin, buf, sizeof(buf))); 1508 1509 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { 1510 printk(KERN_WARNING "svc: only UDP and TCP " 1511 "sockets supported\n"); 1512 return ERR_PTR(-EINVAL); 1513 } 1514 1515 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; 1516 switch (sin->sa_family) { 1517 case AF_INET6: 1518 family = PF_INET6; 1519 break; 1520 case AF_INET: 1521 family = PF_INET; 1522 break; 1523 default: 1524 return ERR_PTR(-EINVAL); 1525 } 1526 1527 error = __sock_create(net, family, type, protocol, &sock, 1); 1528 if (error < 0) 1529 return ERR_PTR(error); 1530 1531 svc_reclassify_socket(sock); 1532 1533 /* 1534 * If this is an PF_INET6 listener, we want to avoid 1535 * getting requests from IPv4 remotes. Those should 1536 * be shunted to a PF_INET listener via rpcbind. 1537 */ 1538 val = 1; 1539 if (family == PF_INET6) 1540 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, 1541 (char *)&val, sizeof(val)); 1542 1543 if (type == SOCK_STREAM) 1544 sock->sk->sk_reuse = 1; /* allow address reuse */ 1545 error = kernel_bind(sock, sin, len); 1546 if (error < 0) 1547 goto bummer; 1548 1549 newlen = len; 1550 error = kernel_getsockname(sock, newsin, &newlen); 1551 if (error < 0) 1552 goto bummer; 1553 1554 if (protocol == IPPROTO_TCP) { 1555 if ((error = kernel_listen(sock, 64)) < 0) 1556 goto bummer; 1557 } 1558 1559 if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { 1560 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); 1561 return (struct svc_xprt *)svsk; 1562 } 1563 1564 bummer: 1565 dprintk("svc: svc_create_socket error = %d\n", -error); 1566 sock_release(sock); 1567 return ERR_PTR(error); 1568 } 1569 1570 /* 1571 * Detach the svc_sock from the socket so that no 1572 * more callbacks occur. 1573 */ 1574 static void svc_sock_detach(struct svc_xprt *xprt) 1575 { 1576 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1577 struct sock *sk = svsk->sk_sk; 1578 wait_queue_head_t *wq; 1579 1580 dprintk("svc: svc_sock_detach(%p)\n", svsk); 1581 1582 /* put back the old socket callbacks */ 1583 sk->sk_state_change = svsk->sk_ostate; 1584 sk->sk_data_ready = svsk->sk_odata; 1585 sk->sk_write_space = svsk->sk_owspace; 1586 1587 wq = sk_sleep(sk); 1588 if (wq && waitqueue_active(wq)) 1589 wake_up_interruptible(wq); 1590 } 1591 1592 /* 1593 * Disconnect the socket, and reset the callbacks 1594 */ 1595 static void svc_tcp_sock_detach(struct svc_xprt *xprt) 1596 { 1597 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1598 1599 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); 1600 1601 svc_sock_detach(xprt); 1602 1603 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 1604 svc_tcp_clear_pages(svsk); 1605 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); 1606 } 1607 } 1608 1609 /* 1610 * Free the svc_sock's socket resources and the svc_sock itself. 1611 */ 1612 static void svc_sock_free(struct svc_xprt *xprt) 1613 { 1614 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1615 dprintk("svc: svc_sock_free(%p)\n", svsk); 1616 1617 if (svsk->sk_sock->file) 1618 sockfd_put(svsk->sk_sock); 1619 else 1620 sock_release(svsk->sk_sock); 1621 kfree(svsk); 1622 } 1623 1624 #if defined(CONFIG_NFS_V4_1) 1625 /* 1626 * Create a back channel svc_xprt which shares the fore channel socket. 1627 */ 1628 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, 1629 int protocol, 1630 struct net *net, 1631 struct sockaddr *sin, int len, 1632 int flags) 1633 { 1634 struct svc_sock *svsk; 1635 struct svc_xprt *xprt; 1636 1637 if (protocol != IPPROTO_TCP) { 1638 printk(KERN_WARNING "svc: only TCP sockets" 1639 " supported on shared back channel\n"); 1640 return ERR_PTR(-EINVAL); 1641 } 1642 1643 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1644 if (!svsk) 1645 return ERR_PTR(-ENOMEM); 1646 1647 xprt = &svsk->sk_xprt; 1648 svc_xprt_init(&svc_tcp_bc_class, xprt, serv); 1649 1650 serv->sv_bc_xprt = xprt; 1651 1652 return xprt; 1653 } 1654 1655 /* 1656 * Free a back channel svc_sock. 1657 */ 1658 static void svc_bc_sock_free(struct svc_xprt *xprt) 1659 { 1660 if (xprt) 1661 kfree(container_of(xprt, struct svc_sock, sk_xprt)); 1662 } 1663 #endif /* CONFIG_NFS_V4_1 */ 1664