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/module.h> 25 #include <linux/errno.h> 26 #include <linux/fcntl.h> 27 #include <linux/net.h> 28 #include <linux/in.h> 29 #include <linux/inet.h> 30 #include <linux/udp.h> 31 #include <linux/tcp.h> 32 #include <linux/unistd.h> 33 #include <linux/slab.h> 34 #include <linux/netdevice.h> 35 #include <linux/skbuff.h> 36 #include <linux/file.h> 37 #include <linux/freezer.h> 38 #include <net/sock.h> 39 #include <net/checksum.h> 40 #include <net/ip.h> 41 #include <net/ipv6.h> 42 #include <net/tcp.h> 43 #include <net/tcp_states.h> 44 #include <asm/uaccess.h> 45 #include <asm/ioctls.h> 46 #include <trace/events/skb.h> 47 48 #include <linux/sunrpc/types.h> 49 #include <linux/sunrpc/clnt.h> 50 #include <linux/sunrpc/xdr.h> 51 #include <linux/sunrpc/msg_prot.h> 52 #include <linux/sunrpc/svcsock.h> 53 #include <linux/sunrpc/stats.h> 54 #include <linux/sunrpc/xprt.h> 55 56 #include "sunrpc.h" 57 58 #define RPCDBG_FACILITY RPCDBG_SVCXPRT 59 60 61 static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, 62 int flags); 63 static void svc_udp_data_ready(struct sock *, int); 64 static int svc_udp_recvfrom(struct svc_rqst *); 65 static int svc_udp_sendto(struct svc_rqst *); 66 static void svc_sock_detach(struct svc_xprt *); 67 static void svc_tcp_sock_detach(struct svc_xprt *); 68 static void svc_sock_free(struct svc_xprt *); 69 70 static struct svc_xprt *svc_create_socket(struct svc_serv *, int, 71 struct net *, struct sockaddr *, 72 int, int); 73 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 74 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, 75 struct net *, struct sockaddr *, 76 int, int); 77 static void svc_bc_sock_free(struct svc_xprt *xprt); 78 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 79 80 #ifdef CONFIG_DEBUG_LOCK_ALLOC 81 static struct lock_class_key svc_key[2]; 82 static struct lock_class_key svc_slock_key[2]; 83 84 static void svc_reclassify_socket(struct socket *sock) 85 { 86 struct sock *sk = sock->sk; 87 88 WARN_ON_ONCE(sock_owned_by_user(sk)); 89 if (sock_owned_by_user(sk)) 90 return; 91 92 switch (sk->sk_family) { 93 case AF_INET: 94 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", 95 &svc_slock_key[0], 96 "sk_xprt.xpt_lock-AF_INET-NFSD", 97 &svc_key[0]); 98 break; 99 100 case AF_INET6: 101 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", 102 &svc_slock_key[1], 103 "sk_xprt.xpt_lock-AF_INET6-NFSD", 104 &svc_key[1]); 105 break; 106 107 default: 108 BUG(); 109 } 110 } 111 #else 112 static void svc_reclassify_socket(struct socket *sock) 113 { 114 } 115 #endif 116 117 /* 118 * Release an skbuff after use 119 */ 120 static void svc_release_skb(struct svc_rqst *rqstp) 121 { 122 struct sk_buff *skb = rqstp->rq_xprt_ctxt; 123 124 if (skb) { 125 struct svc_sock *svsk = 126 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 127 rqstp->rq_xprt_ctxt = NULL; 128 129 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); 130 skb_free_datagram_locked(svsk->sk_sk, skb); 131 } 132 } 133 134 union svc_pktinfo_u { 135 struct in_pktinfo pkti; 136 struct in6_pktinfo pkti6; 137 }; 138 #define SVC_PKTINFO_SPACE \ 139 CMSG_SPACE(sizeof(union svc_pktinfo_u)) 140 141 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) 142 { 143 struct svc_sock *svsk = 144 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 145 switch (svsk->sk_sk->sk_family) { 146 case AF_INET: { 147 struct in_pktinfo *pki = CMSG_DATA(cmh); 148 149 cmh->cmsg_level = SOL_IP; 150 cmh->cmsg_type = IP_PKTINFO; 151 pki->ipi_ifindex = 0; 152 pki->ipi_spec_dst.s_addr = 153 svc_daddr_in(rqstp)->sin_addr.s_addr; 154 cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); 155 } 156 break; 157 158 case AF_INET6: { 159 struct in6_pktinfo *pki = CMSG_DATA(cmh); 160 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); 161 162 cmh->cmsg_level = SOL_IPV6; 163 cmh->cmsg_type = IPV6_PKTINFO; 164 pki->ipi6_ifindex = daddr->sin6_scope_id; 165 pki->ipi6_addr = daddr->sin6_addr; 166 cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); 167 } 168 break; 169 } 170 } 171 172 /* 173 * send routine intended to be shared by the fore- and back-channel 174 */ 175 int svc_send_common(struct socket *sock, struct xdr_buf *xdr, 176 struct page *headpage, unsigned long headoffset, 177 struct page *tailpage, unsigned long tailoffset) 178 { 179 int result; 180 int size; 181 struct page **ppage = xdr->pages; 182 size_t base = xdr->page_base; 183 unsigned int pglen = xdr->page_len; 184 unsigned int flags = MSG_MORE; 185 int slen; 186 int len = 0; 187 188 slen = xdr->len; 189 190 /* send head */ 191 if (slen == xdr->head[0].iov_len) 192 flags = 0; 193 len = kernel_sendpage(sock, headpage, headoffset, 194 xdr->head[0].iov_len, flags); 195 if (len != xdr->head[0].iov_len) 196 goto out; 197 slen -= xdr->head[0].iov_len; 198 if (slen == 0) 199 goto out; 200 201 /* send page data */ 202 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; 203 while (pglen > 0) { 204 if (slen == size) 205 flags = 0; 206 result = kernel_sendpage(sock, *ppage, base, size, flags); 207 if (result > 0) 208 len += result; 209 if (result != size) 210 goto out; 211 slen -= size; 212 pglen -= size; 213 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; 214 base = 0; 215 ppage++; 216 } 217 218 /* send tail */ 219 if (xdr->tail[0].iov_len) { 220 result = kernel_sendpage(sock, tailpage, tailoffset, 221 xdr->tail[0].iov_len, 0); 222 if (result > 0) 223 len += result; 224 } 225 226 out: 227 return len; 228 } 229 230 231 /* 232 * Generic sendto routine 233 */ 234 static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) 235 { 236 struct svc_sock *svsk = 237 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 238 struct socket *sock = svsk->sk_sock; 239 union { 240 struct cmsghdr hdr; 241 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 242 } buffer; 243 struct cmsghdr *cmh = &buffer.hdr; 244 int len = 0; 245 unsigned long tailoff; 246 unsigned long headoff; 247 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 248 249 if (rqstp->rq_prot == IPPROTO_UDP) { 250 struct msghdr msg = { 251 .msg_name = &rqstp->rq_addr, 252 .msg_namelen = rqstp->rq_addrlen, 253 .msg_control = cmh, 254 .msg_controllen = sizeof(buffer), 255 .msg_flags = MSG_MORE, 256 }; 257 258 svc_set_cmsg_data(rqstp, cmh); 259 260 if (sock_sendmsg(sock, &msg, 0) < 0) 261 goto out; 262 } 263 264 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); 265 headoff = 0; 266 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, 267 rqstp->rq_respages[0], tailoff); 268 269 out: 270 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", 271 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, 272 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); 273 274 return len; 275 } 276 277 /* 278 * Report socket names for nfsdfs 279 */ 280 static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) 281 { 282 const struct sock *sk = svsk->sk_sk; 283 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? 284 "udp" : "tcp"; 285 int len; 286 287 switch (sk->sk_family) { 288 case PF_INET: 289 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", 290 proto_name, 291 &inet_sk(sk)->inet_rcv_saddr, 292 inet_sk(sk)->inet_num); 293 break; 294 #if IS_ENABLED(CONFIG_IPV6) 295 case PF_INET6: 296 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", 297 proto_name, 298 &sk->sk_v6_rcv_saddr, 299 inet_sk(sk)->inet_num); 300 break; 301 #endif 302 default: 303 len = snprintf(buf, remaining, "*unknown-%d*\n", 304 sk->sk_family); 305 } 306 307 if (len >= remaining) { 308 *buf = '\0'; 309 return -ENAMETOOLONG; 310 } 311 return len; 312 } 313 314 /* 315 * Check input queue length 316 */ 317 static int svc_recv_available(struct svc_sock *svsk) 318 { 319 struct socket *sock = svsk->sk_sock; 320 int avail, err; 321 322 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); 323 324 return (err >= 0)? avail : err; 325 } 326 327 /* 328 * Generic recvfrom routine. 329 */ 330 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, 331 int buflen) 332 { 333 struct svc_sock *svsk = 334 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 335 struct msghdr msg = { 336 .msg_flags = MSG_DONTWAIT, 337 }; 338 int len; 339 340 rqstp->rq_xprt_hlen = 0; 341 342 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, 343 msg.msg_flags); 344 345 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", 346 svsk, iov[0].iov_base, iov[0].iov_len, len); 347 return len; 348 } 349 350 static int svc_partial_recvfrom(struct svc_rqst *rqstp, 351 struct kvec *iov, int nr, 352 int buflen, unsigned int base) 353 { 354 size_t save_iovlen; 355 void *save_iovbase; 356 unsigned int i; 357 int ret; 358 359 if (base == 0) 360 return svc_recvfrom(rqstp, iov, nr, buflen); 361 362 for (i = 0; i < nr; i++) { 363 if (iov[i].iov_len > base) 364 break; 365 base -= iov[i].iov_len; 366 } 367 save_iovlen = iov[i].iov_len; 368 save_iovbase = iov[i].iov_base; 369 iov[i].iov_len -= base; 370 iov[i].iov_base += base; 371 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); 372 iov[i].iov_len = save_iovlen; 373 iov[i].iov_base = save_iovbase; 374 return ret; 375 } 376 377 /* 378 * Set socket snd and rcv buffer lengths 379 */ 380 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, 381 unsigned int rcv) 382 { 383 #if 0 384 mm_segment_t oldfs; 385 oldfs = get_fs(); set_fs(KERNEL_DS); 386 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, 387 (char*)&snd, sizeof(snd)); 388 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 389 (char*)&rcv, sizeof(rcv)); 390 #else 391 /* sock_setsockopt limits use to sysctl_?mem_max, 392 * which isn't acceptable. Until that is made conditional 393 * on not having CAP_SYS_RESOURCE or similar, we go direct... 394 * DaveM said I could! 395 */ 396 lock_sock(sock->sk); 397 sock->sk->sk_sndbuf = snd * 2; 398 sock->sk->sk_rcvbuf = rcv * 2; 399 sock->sk->sk_write_space(sock->sk); 400 release_sock(sock->sk); 401 #endif 402 } 403 /* 404 * INET callback when data has been received on the socket. 405 */ 406 static void svc_udp_data_ready(struct sock *sk, int count) 407 { 408 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 409 wait_queue_head_t *wq = sk_sleep(sk); 410 411 if (svsk) { 412 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", 413 svsk, sk, count, 414 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 415 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 416 svc_xprt_enqueue(&svsk->sk_xprt); 417 } 418 if (wq && waitqueue_active(wq)) 419 wake_up_interruptible(wq); 420 } 421 422 /* 423 * INET callback when space is newly available on the socket. 424 */ 425 static void svc_write_space(struct sock *sk) 426 { 427 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); 428 wait_queue_head_t *wq = sk_sleep(sk); 429 430 if (svsk) { 431 dprintk("svc: socket %p(inet %p), write_space busy=%d\n", 432 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 433 svc_xprt_enqueue(&svsk->sk_xprt); 434 } 435 436 if (wq && waitqueue_active(wq)) { 437 dprintk("RPC svc_write_space: someone sleeping on %p\n", 438 svsk); 439 wake_up_interruptible(wq); 440 } 441 } 442 443 static void svc_tcp_write_space(struct sock *sk) 444 { 445 struct socket *sock = sk->sk_socket; 446 447 if (sk_stream_is_writeable(sk) && sock) 448 clear_bit(SOCK_NOSPACE, &sock->flags); 449 svc_write_space(sk); 450 } 451 452 /* 453 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo 454 */ 455 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, 456 struct cmsghdr *cmh) 457 { 458 struct in_pktinfo *pki = CMSG_DATA(cmh); 459 struct sockaddr_in *daddr = svc_daddr_in(rqstp); 460 461 if (cmh->cmsg_type != IP_PKTINFO) 462 return 0; 463 464 daddr->sin_family = AF_INET; 465 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; 466 return 1; 467 } 468 469 /* 470 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl 471 */ 472 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, 473 struct cmsghdr *cmh) 474 { 475 struct in6_pktinfo *pki = CMSG_DATA(cmh); 476 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); 477 478 if (cmh->cmsg_type != IPV6_PKTINFO) 479 return 0; 480 481 daddr->sin6_family = AF_INET6; 482 daddr->sin6_addr = pki->ipi6_addr; 483 daddr->sin6_scope_id = pki->ipi6_ifindex; 484 return 1; 485 } 486 487 /* 488 * Copy the UDP datagram's destination address to the rqstp structure. 489 * The 'destination' address in this case is the address to which the 490 * peer sent the datagram, i.e. our local address. For multihomed 491 * hosts, this can change from msg to msg. Note that only the IP 492 * address changes, the port number should remain the same. 493 */ 494 static int svc_udp_get_dest_address(struct svc_rqst *rqstp, 495 struct cmsghdr *cmh) 496 { 497 switch (cmh->cmsg_level) { 498 case SOL_IP: 499 return svc_udp_get_dest_address4(rqstp, cmh); 500 case SOL_IPV6: 501 return svc_udp_get_dest_address6(rqstp, cmh); 502 } 503 504 return 0; 505 } 506 507 /* 508 * Receive a datagram from a UDP socket. 509 */ 510 static int svc_udp_recvfrom(struct svc_rqst *rqstp) 511 { 512 struct svc_sock *svsk = 513 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 514 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 515 struct sk_buff *skb; 516 union { 517 struct cmsghdr hdr; 518 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 519 } buffer; 520 struct cmsghdr *cmh = &buffer.hdr; 521 struct msghdr msg = { 522 .msg_name = svc_addr(rqstp), 523 .msg_control = cmh, 524 .msg_controllen = sizeof(buffer), 525 .msg_flags = MSG_DONTWAIT, 526 }; 527 size_t len; 528 int err; 529 530 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) 531 /* udp sockets need large rcvbuf as all pending 532 * requests are still in that buffer. sndbuf must 533 * also be large enough that there is enough space 534 * for one reply per thread. We count all threads 535 * rather than threads in a particular pool, which 536 * provides an upper bound on the number of threads 537 * which will access the socket. 538 */ 539 svc_sock_setbufsize(svsk->sk_sock, 540 (serv->sv_nrthreads+3) * serv->sv_max_mesg, 541 (serv->sv_nrthreads+3) * serv->sv_max_mesg); 542 543 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 544 skb = NULL; 545 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, 546 0, 0, MSG_PEEK | MSG_DONTWAIT); 547 if (err >= 0) 548 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); 549 550 if (skb == NULL) { 551 if (err != -EAGAIN) { 552 /* possibly an icmp error */ 553 dprintk("svc: recvfrom returned error %d\n", -err); 554 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 555 } 556 return 0; 557 } 558 len = svc_addr_len(svc_addr(rqstp)); 559 rqstp->rq_addrlen = len; 560 if (skb->tstamp.tv64 == 0) { 561 skb->tstamp = ktime_get_real(); 562 /* Don't enable netstamp, sunrpc doesn't 563 need that much accuracy */ 564 } 565 svsk->sk_sk->sk_stamp = skb->tstamp; 566 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ 567 568 len = skb->len - sizeof(struct udphdr); 569 rqstp->rq_arg.len = len; 570 571 rqstp->rq_prot = IPPROTO_UDP; 572 573 if (!svc_udp_get_dest_address(rqstp, cmh)) { 574 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", 575 cmh->cmsg_level, cmh->cmsg_type); 576 goto out_free; 577 } 578 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); 579 580 if (skb_is_nonlinear(skb)) { 581 /* we have to copy */ 582 local_bh_disable(); 583 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { 584 local_bh_enable(); 585 /* checksum error */ 586 goto out_free; 587 } 588 local_bh_enable(); 589 skb_free_datagram_locked(svsk->sk_sk, skb); 590 } else { 591 /* we can use it in-place */ 592 rqstp->rq_arg.head[0].iov_base = skb->data + 593 sizeof(struct udphdr); 594 rqstp->rq_arg.head[0].iov_len = len; 595 if (skb_checksum_complete(skb)) 596 goto out_free; 597 rqstp->rq_xprt_ctxt = skb; 598 } 599 600 rqstp->rq_arg.page_base = 0; 601 if (len <= rqstp->rq_arg.head[0].iov_len) { 602 rqstp->rq_arg.head[0].iov_len = len; 603 rqstp->rq_arg.page_len = 0; 604 rqstp->rq_respages = rqstp->rq_pages+1; 605 } else { 606 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; 607 rqstp->rq_respages = rqstp->rq_pages + 1 + 608 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); 609 } 610 rqstp->rq_next_page = rqstp->rq_respages+1; 611 612 if (serv->sv_stats) 613 serv->sv_stats->netudpcnt++; 614 615 return len; 616 out_free: 617 trace_kfree_skb(skb, svc_udp_recvfrom); 618 skb_free_datagram_locked(svsk->sk_sk, skb); 619 return 0; 620 } 621 622 static int 623 svc_udp_sendto(struct svc_rqst *rqstp) 624 { 625 int error; 626 627 error = svc_sendto(rqstp, &rqstp->rq_res); 628 if (error == -ECONNREFUSED) 629 /* ICMP error on earlier request. */ 630 error = svc_sendto(rqstp, &rqstp->rq_res); 631 632 return error; 633 } 634 635 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) 636 { 637 } 638 639 static int svc_udp_has_wspace(struct svc_xprt *xprt) 640 { 641 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 642 struct svc_serv *serv = xprt->xpt_server; 643 unsigned long required; 644 645 /* 646 * Set the SOCK_NOSPACE flag before checking the available 647 * sock space. 648 */ 649 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 650 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; 651 if (required*2 > sock_wspace(svsk->sk_sk)) 652 return 0; 653 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 654 return 1; 655 } 656 657 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) 658 { 659 BUG(); 660 return NULL; 661 } 662 663 static struct svc_xprt *svc_udp_create(struct svc_serv *serv, 664 struct net *net, 665 struct sockaddr *sa, int salen, 666 int flags) 667 { 668 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); 669 } 670 671 static struct svc_xprt_ops svc_udp_ops = { 672 .xpo_create = svc_udp_create, 673 .xpo_recvfrom = svc_udp_recvfrom, 674 .xpo_sendto = svc_udp_sendto, 675 .xpo_release_rqst = svc_release_skb, 676 .xpo_detach = svc_sock_detach, 677 .xpo_free = svc_sock_free, 678 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, 679 .xpo_has_wspace = svc_udp_has_wspace, 680 .xpo_accept = svc_udp_accept, 681 }; 682 683 static struct svc_xprt_class svc_udp_class = { 684 .xcl_name = "udp", 685 .xcl_owner = THIS_MODULE, 686 .xcl_ops = &svc_udp_ops, 687 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, 688 }; 689 690 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) 691 { 692 int err, level, optname, one = 1; 693 694 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, 695 &svsk->sk_xprt, serv); 696 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 697 svsk->sk_sk->sk_data_ready = svc_udp_data_ready; 698 svsk->sk_sk->sk_write_space = svc_write_space; 699 700 /* initialise setting must have enough space to 701 * receive and respond to one request. 702 * svc_udp_recvfrom will re-adjust if necessary 703 */ 704 svc_sock_setbufsize(svsk->sk_sock, 705 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, 706 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); 707 708 /* data might have come in before data_ready set up */ 709 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 710 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 711 712 /* make sure we get destination address info */ 713 switch (svsk->sk_sk->sk_family) { 714 case AF_INET: 715 level = SOL_IP; 716 optname = IP_PKTINFO; 717 break; 718 case AF_INET6: 719 level = SOL_IPV6; 720 optname = IPV6_RECVPKTINFO; 721 break; 722 default: 723 BUG(); 724 } 725 err = kernel_setsockopt(svsk->sk_sock, level, optname, 726 (char *)&one, sizeof(one)); 727 dprintk("svc: kernel_setsockopt returned %d\n", err); 728 } 729 730 /* 731 * A data_ready event on a listening socket means there's a connection 732 * pending. Do not use state_change as a substitute for it. 733 */ 734 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) 735 { 736 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 737 wait_queue_head_t *wq; 738 739 dprintk("svc: socket %p TCP (listen) state change %d\n", 740 sk, sk->sk_state); 741 742 /* 743 * This callback may called twice when a new connection 744 * is established as a child socket inherits everything 745 * from a parent LISTEN socket. 746 * 1) data_ready method of the parent socket will be called 747 * when one of child sockets become ESTABLISHED. 748 * 2) data_ready method of the child socket may be called 749 * when it receives data before the socket is accepted. 750 * In case of 2, we should ignore it silently. 751 */ 752 if (sk->sk_state == TCP_LISTEN) { 753 if (svsk) { 754 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 755 svc_xprt_enqueue(&svsk->sk_xprt); 756 } else 757 printk("svc: socket %p: no user data\n", sk); 758 } 759 760 wq = sk_sleep(sk); 761 if (wq && waitqueue_active(wq)) 762 wake_up_interruptible_all(wq); 763 } 764 765 /* 766 * A state change on a connected socket means it's dying or dead. 767 */ 768 static void svc_tcp_state_change(struct sock *sk) 769 { 770 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 771 wait_queue_head_t *wq = sk_sleep(sk); 772 773 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", 774 sk, sk->sk_state, sk->sk_user_data); 775 776 if (!svsk) 777 printk("svc: socket %p: no user data\n", sk); 778 else { 779 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 780 svc_xprt_enqueue(&svsk->sk_xprt); 781 } 782 if (wq && waitqueue_active(wq)) 783 wake_up_interruptible_all(wq); 784 } 785 786 static void svc_tcp_data_ready(struct sock *sk, int count) 787 { 788 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 789 wait_queue_head_t *wq = sk_sleep(sk); 790 791 dprintk("svc: socket %p TCP data ready (svsk %p)\n", 792 sk, sk->sk_user_data); 793 if (svsk) { 794 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 795 svc_xprt_enqueue(&svsk->sk_xprt); 796 } 797 if (wq && waitqueue_active(wq)) 798 wake_up_interruptible(wq); 799 } 800 801 /* 802 * Accept a TCP connection 803 */ 804 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) 805 { 806 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 807 struct sockaddr_storage addr; 808 struct sockaddr *sin = (struct sockaddr *) &addr; 809 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 810 struct socket *sock = svsk->sk_sock; 811 struct socket *newsock; 812 struct svc_sock *newsvsk; 813 int err, slen; 814 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 815 816 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); 817 if (!sock) 818 return NULL; 819 820 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 821 err = kernel_accept(sock, &newsock, O_NONBLOCK); 822 if (err < 0) { 823 if (err == -ENOMEM) 824 printk(KERN_WARNING "%s: no more sockets!\n", 825 serv->sv_name); 826 else if (err != -EAGAIN) 827 net_warn_ratelimited("%s: accept failed (err %d)!\n", 828 serv->sv_name, -err); 829 return NULL; 830 } 831 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 832 833 err = kernel_getpeername(newsock, sin, &slen); 834 if (err < 0) { 835 net_warn_ratelimited("%s: peername failed (err %d)!\n", 836 serv->sv_name, -err); 837 goto failed; /* aborted connection or whatever */ 838 } 839 840 /* Ideally, we would want to reject connections from unauthorized 841 * hosts here, but when we get encryption, the IP of the host won't 842 * tell us anything. For now just warn about unpriv connections. 843 */ 844 if (!svc_port_is_privileged(sin)) { 845 dprintk(KERN_WARNING 846 "%s: connect from unprivileged port: %s\n", 847 serv->sv_name, 848 __svc_print_addr(sin, buf, sizeof(buf))); 849 } 850 dprintk("%s: connect from %s\n", serv->sv_name, 851 __svc_print_addr(sin, buf, sizeof(buf))); 852 853 /* make sure that a write doesn't block forever when 854 * low on memory 855 */ 856 newsock->sk->sk_sndtimeo = HZ*30; 857 858 newsvsk = svc_setup_socket(serv, newsock, 859 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); 860 if (IS_ERR(newsvsk)) 861 goto failed; 862 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); 863 err = kernel_getsockname(newsock, sin, &slen); 864 if (unlikely(err < 0)) { 865 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); 866 slen = offsetof(struct sockaddr, sa_data); 867 } 868 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); 869 870 if (serv->sv_stats) 871 serv->sv_stats->nettcpconn++; 872 873 return &newsvsk->sk_xprt; 874 875 failed: 876 sock_release(newsock); 877 return NULL; 878 } 879 880 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 881 { 882 unsigned int i, len, npages; 883 884 if (svsk->sk_datalen == 0) 885 return 0; 886 len = svsk->sk_datalen; 887 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 888 for (i = 0; i < npages; i++) { 889 if (rqstp->rq_pages[i] != NULL) 890 put_page(rqstp->rq_pages[i]); 891 BUG_ON(svsk->sk_pages[i] == NULL); 892 rqstp->rq_pages[i] = svsk->sk_pages[i]; 893 svsk->sk_pages[i] = NULL; 894 } 895 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); 896 return len; 897 } 898 899 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 900 { 901 unsigned int i, len, npages; 902 903 if (svsk->sk_datalen == 0) 904 return; 905 len = svsk->sk_datalen; 906 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 907 for (i = 0; i < npages; i++) { 908 svsk->sk_pages[i] = rqstp->rq_pages[i]; 909 rqstp->rq_pages[i] = NULL; 910 } 911 } 912 913 static void svc_tcp_clear_pages(struct svc_sock *svsk) 914 { 915 unsigned int i, len, npages; 916 917 if (svsk->sk_datalen == 0) 918 goto out; 919 len = svsk->sk_datalen; 920 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 921 for (i = 0; i < npages; i++) { 922 if (svsk->sk_pages[i] == NULL) { 923 WARN_ON_ONCE(1); 924 continue; 925 } 926 put_page(svsk->sk_pages[i]); 927 svsk->sk_pages[i] = NULL; 928 } 929 out: 930 svsk->sk_tcplen = 0; 931 svsk->sk_datalen = 0; 932 } 933 934 /* 935 * Receive fragment record header. 936 * If we haven't gotten the record length yet, get the next four bytes. 937 */ 938 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 939 { 940 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 941 unsigned int want; 942 int len; 943 944 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 945 946 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { 947 struct kvec iov; 948 949 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; 950 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; 951 iov.iov_len = want; 952 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) 953 goto error; 954 svsk->sk_tcplen += len; 955 956 if (len < want) { 957 dprintk("svc: short recvfrom while reading record " 958 "length (%d of %d)\n", len, want); 959 return -EAGAIN; 960 } 961 962 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); 963 if (svc_sock_reclen(svsk) + svsk->sk_datalen > 964 serv->sv_max_mesg) { 965 net_notice_ratelimited("RPC: fragment too large: %d\n", 966 svc_sock_reclen(svsk)); 967 goto err_delete; 968 } 969 } 970 971 return svc_sock_reclen(svsk); 972 error: 973 dprintk("RPC: TCP recv_record got %d\n", len); 974 return len; 975 err_delete: 976 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 977 return -EAGAIN; 978 } 979 980 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) 981 { 982 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; 983 struct rpc_rqst *req = NULL; 984 struct kvec *src, *dst; 985 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 986 __be32 xid; 987 __be32 calldir; 988 989 xid = *p++; 990 calldir = *p; 991 992 if (bc_xprt) 993 req = xprt_lookup_rqst(bc_xprt, xid); 994 995 if (!req) { 996 printk(KERN_NOTICE 997 "%s: Got unrecognized reply: " 998 "calldir 0x%x xpt_bc_xprt %p xid %08x\n", 999 __func__, ntohl(calldir), 1000 bc_xprt, xid); 1001 return -EAGAIN; 1002 } 1003 1004 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); 1005 /* 1006 * XXX!: cheating for now! Only copying HEAD. 1007 * But we know this is good enough for now (in fact, for any 1008 * callback reply in the forseeable future). 1009 */ 1010 dst = &req->rq_private_buf.head[0]; 1011 src = &rqstp->rq_arg.head[0]; 1012 if (dst->iov_len < src->iov_len) 1013 return -EAGAIN; /* whatever; just giving up. */ 1014 memcpy(dst->iov_base, src->iov_base, src->iov_len); 1015 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); 1016 rqstp->rq_arg.len = 0; 1017 return 0; 1018 } 1019 1020 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) 1021 { 1022 int i = 0; 1023 int t = 0; 1024 1025 while (t < len) { 1026 vec[i].iov_base = page_address(pages[i]); 1027 vec[i].iov_len = PAGE_SIZE; 1028 i++; 1029 t += PAGE_SIZE; 1030 } 1031 return i; 1032 } 1033 1034 static void svc_tcp_fragment_received(struct svc_sock *svsk) 1035 { 1036 /* If we have more data, signal svc_xprt_enqueue() to try again */ 1037 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) 1038 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1039 dprintk("svc: TCP %s record (%d bytes)\n", 1040 svc_sock_final_rec(svsk) ? "final" : "nonfinal", 1041 svc_sock_reclen(svsk)); 1042 svsk->sk_tcplen = 0; 1043 svsk->sk_reclen = 0; 1044 } 1045 1046 /* 1047 * Receive data from a TCP socket. 1048 */ 1049 static int svc_tcp_recvfrom(struct svc_rqst *rqstp) 1050 { 1051 struct svc_sock *svsk = 1052 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 1053 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1054 int len; 1055 struct kvec *vec; 1056 unsigned int want, base; 1057 __be32 *p; 1058 __be32 calldir; 1059 int pnum; 1060 1061 dprintk("svc: tcp_recv %p data %d conn %d close %d\n", 1062 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), 1063 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), 1064 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); 1065 1066 len = svc_tcp_recv_record(svsk, rqstp); 1067 if (len < 0) 1068 goto error; 1069 1070 base = svc_tcp_restore_pages(svsk, rqstp); 1071 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); 1072 1073 vec = rqstp->rq_vec; 1074 1075 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], 1076 svsk->sk_datalen + want); 1077 1078 rqstp->rq_respages = &rqstp->rq_pages[pnum]; 1079 rqstp->rq_next_page = rqstp->rq_respages + 1; 1080 1081 /* Now receive data */ 1082 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); 1083 if (len >= 0) { 1084 svsk->sk_tcplen += len; 1085 svsk->sk_datalen += len; 1086 } 1087 if (len != want || !svc_sock_final_rec(svsk)) { 1088 svc_tcp_save_pages(svsk, rqstp); 1089 if (len < 0 && len != -EAGAIN) 1090 goto err_delete; 1091 if (len == want) 1092 svc_tcp_fragment_received(svsk); 1093 else 1094 dprintk("svc: incomplete TCP record (%d of %d)\n", 1095 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), 1096 svc_sock_reclen(svsk)); 1097 goto err_noclose; 1098 } 1099 1100 if (svsk->sk_datalen < 8) { 1101 svsk->sk_datalen = 0; 1102 goto err_delete; /* client is nuts. */ 1103 } 1104 1105 rqstp->rq_arg.len = svsk->sk_datalen; 1106 rqstp->rq_arg.page_base = 0; 1107 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { 1108 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; 1109 rqstp->rq_arg.page_len = 0; 1110 } else 1111 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 1112 1113 rqstp->rq_xprt_ctxt = NULL; 1114 rqstp->rq_prot = IPPROTO_TCP; 1115 1116 p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 1117 calldir = p[1]; 1118 if (calldir) 1119 len = receive_cb_reply(svsk, rqstp); 1120 1121 /* Reset TCP read info */ 1122 svsk->sk_datalen = 0; 1123 svc_tcp_fragment_received(svsk); 1124 1125 if (len < 0) 1126 goto error; 1127 1128 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); 1129 if (serv->sv_stats) 1130 serv->sv_stats->nettcpcnt++; 1131 1132 return rqstp->rq_arg.len; 1133 1134 error: 1135 if (len != -EAGAIN) 1136 goto err_delete; 1137 dprintk("RPC: TCP recvfrom got EAGAIN\n"); 1138 return 0; 1139 err_delete: 1140 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", 1141 svsk->sk_xprt.xpt_server->sv_name, -len); 1142 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1143 err_noclose: 1144 return 0; /* record not complete */ 1145 } 1146 1147 /* 1148 * Send out data on TCP socket. 1149 */ 1150 static int svc_tcp_sendto(struct svc_rqst *rqstp) 1151 { 1152 struct xdr_buf *xbufp = &rqstp->rq_res; 1153 int sent; 1154 __be32 reclen; 1155 1156 /* Set up the first element of the reply kvec. 1157 * Any other kvecs that may be in use have been taken 1158 * care of by the server implementation itself. 1159 */ 1160 reclen = htonl(0x80000000|((xbufp->len ) - 4)); 1161 memcpy(xbufp->head[0].iov_base, &reclen, 4); 1162 1163 sent = svc_sendto(rqstp, &rqstp->rq_res); 1164 if (sent != xbufp->len) { 1165 printk(KERN_NOTICE 1166 "rpc-srv/tcp: %s: %s %d when sending %d bytes " 1167 "- shutting down socket\n", 1168 rqstp->rq_xprt->xpt_server->sv_name, 1169 (sent<0)?"got error":"sent only", 1170 sent, xbufp->len); 1171 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); 1172 svc_xprt_enqueue(rqstp->rq_xprt); 1173 sent = -EAGAIN; 1174 } 1175 return sent; 1176 } 1177 1178 /* 1179 * Setup response header. TCP has a 4B record length field. 1180 */ 1181 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) 1182 { 1183 struct kvec *resv = &rqstp->rq_res.head[0]; 1184 1185 /* tcp needs a space for the record length... */ 1186 svc_putnl(resv, 0); 1187 } 1188 1189 static int svc_tcp_has_wspace(struct svc_xprt *xprt) 1190 { 1191 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1192 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1193 int required; 1194 1195 if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) 1196 return 1; 1197 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; 1198 if (sk_stream_wspace(svsk->sk_sk) >= required || 1199 (sk_stream_min_wspace(svsk->sk_sk) == 0 && 1200 atomic_read(&xprt->xpt_reserved) == 0)) 1201 return 1; 1202 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 1203 return 0; 1204 } 1205 1206 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, 1207 struct net *net, 1208 struct sockaddr *sa, int salen, 1209 int flags) 1210 { 1211 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1212 } 1213 1214 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1215 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, 1216 struct net *, struct sockaddr *, 1217 int, int); 1218 static void svc_bc_sock_free(struct svc_xprt *xprt); 1219 1220 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, 1221 struct net *net, 1222 struct sockaddr *sa, int salen, 1223 int flags) 1224 { 1225 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1226 } 1227 1228 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) 1229 { 1230 } 1231 1232 static struct svc_xprt_ops svc_tcp_bc_ops = { 1233 .xpo_create = svc_bc_tcp_create, 1234 .xpo_detach = svc_bc_tcp_sock_detach, 1235 .xpo_free = svc_bc_sock_free, 1236 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1237 }; 1238 1239 static struct svc_xprt_class svc_tcp_bc_class = { 1240 .xcl_name = "tcp-bc", 1241 .xcl_owner = THIS_MODULE, 1242 .xcl_ops = &svc_tcp_bc_ops, 1243 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1244 }; 1245 1246 static void svc_init_bc_xprt_sock(void) 1247 { 1248 svc_reg_xprt_class(&svc_tcp_bc_class); 1249 } 1250 1251 static void svc_cleanup_bc_xprt_sock(void) 1252 { 1253 svc_unreg_xprt_class(&svc_tcp_bc_class); 1254 } 1255 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 1256 static void svc_init_bc_xprt_sock(void) 1257 { 1258 } 1259 1260 static void svc_cleanup_bc_xprt_sock(void) 1261 { 1262 } 1263 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1264 1265 static struct svc_xprt_ops svc_tcp_ops = { 1266 .xpo_create = svc_tcp_create, 1267 .xpo_recvfrom = svc_tcp_recvfrom, 1268 .xpo_sendto = svc_tcp_sendto, 1269 .xpo_release_rqst = svc_release_skb, 1270 .xpo_detach = svc_tcp_sock_detach, 1271 .xpo_free = svc_sock_free, 1272 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1273 .xpo_has_wspace = svc_tcp_has_wspace, 1274 .xpo_accept = svc_tcp_accept, 1275 }; 1276 1277 static struct svc_xprt_class svc_tcp_class = { 1278 .xcl_name = "tcp", 1279 .xcl_owner = THIS_MODULE, 1280 .xcl_ops = &svc_tcp_ops, 1281 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1282 }; 1283 1284 void svc_init_xprt_sock(void) 1285 { 1286 svc_reg_xprt_class(&svc_tcp_class); 1287 svc_reg_xprt_class(&svc_udp_class); 1288 svc_init_bc_xprt_sock(); 1289 } 1290 1291 void svc_cleanup_xprt_sock(void) 1292 { 1293 svc_unreg_xprt_class(&svc_tcp_class); 1294 svc_unreg_xprt_class(&svc_udp_class); 1295 svc_cleanup_bc_xprt_sock(); 1296 } 1297 1298 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) 1299 { 1300 struct sock *sk = svsk->sk_sk; 1301 1302 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, 1303 &svsk->sk_xprt, serv); 1304 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 1305 if (sk->sk_state == TCP_LISTEN) { 1306 dprintk("setting up TCP socket for listening\n"); 1307 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); 1308 sk->sk_data_ready = svc_tcp_listen_data_ready; 1309 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 1310 } else { 1311 dprintk("setting up TCP socket for reading\n"); 1312 sk->sk_state_change = svc_tcp_state_change; 1313 sk->sk_data_ready = svc_tcp_data_ready; 1314 sk->sk_write_space = svc_tcp_write_space; 1315 1316 svsk->sk_reclen = 0; 1317 svsk->sk_tcplen = 0; 1318 svsk->sk_datalen = 0; 1319 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); 1320 1321 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1322 1323 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1324 if (sk->sk_state != TCP_ESTABLISHED) 1325 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1326 } 1327 } 1328 1329 void svc_sock_update_bufs(struct svc_serv *serv) 1330 { 1331 /* 1332 * The number of server threads has changed. Update 1333 * rcvbuf and sndbuf accordingly on all sockets 1334 */ 1335 struct svc_sock *svsk; 1336 1337 spin_lock_bh(&serv->sv_lock); 1338 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) 1339 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 1340 spin_unlock_bh(&serv->sv_lock); 1341 } 1342 EXPORT_SYMBOL_GPL(svc_sock_update_bufs); 1343 1344 /* 1345 * Initialize socket for RPC use and create svc_sock struct 1346 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. 1347 */ 1348 static struct svc_sock *svc_setup_socket(struct svc_serv *serv, 1349 struct socket *sock, 1350 int flags) 1351 { 1352 struct svc_sock *svsk; 1353 struct sock *inet; 1354 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); 1355 int err = 0; 1356 1357 dprintk("svc: svc_setup_socket %p\n", sock); 1358 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1359 if (!svsk) 1360 return ERR_PTR(-ENOMEM); 1361 1362 inet = sock->sk; 1363 1364 /* Register socket with portmapper */ 1365 if (pmap_register) 1366 err = svc_register(serv, sock_net(sock->sk), inet->sk_family, 1367 inet->sk_protocol, 1368 ntohs(inet_sk(inet)->inet_sport)); 1369 1370 if (err < 0) { 1371 kfree(svsk); 1372 return ERR_PTR(err); 1373 } 1374 1375 inet->sk_user_data = svsk; 1376 svsk->sk_sock = sock; 1377 svsk->sk_sk = inet; 1378 svsk->sk_ostate = inet->sk_state_change; 1379 svsk->sk_odata = inet->sk_data_ready; 1380 svsk->sk_owspace = inet->sk_write_space; 1381 1382 /* Initialize the socket */ 1383 if (sock->type == SOCK_DGRAM) 1384 svc_udp_init(svsk, serv); 1385 else { 1386 /* initialise setting must have enough space to 1387 * receive and respond to one request. 1388 */ 1389 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, 1390 4 * serv->sv_max_mesg); 1391 svc_tcp_init(svsk, serv); 1392 } 1393 1394 dprintk("svc: svc_setup_socket created %p (inet %p)\n", 1395 svsk, svsk->sk_sk); 1396 1397 return svsk; 1398 } 1399 1400 /** 1401 * svc_addsock - add a listener socket to an RPC service 1402 * @serv: pointer to RPC service to which to add a new listener 1403 * @fd: file descriptor of the new listener 1404 * @name_return: pointer to buffer to fill in with name of listener 1405 * @len: size of the buffer 1406 * 1407 * Fills in socket name and returns positive length of name if successful. 1408 * Name is terminated with '\n'. On error, returns a negative errno 1409 * value. 1410 */ 1411 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, 1412 const size_t len) 1413 { 1414 int err = 0; 1415 struct socket *so = sockfd_lookup(fd, &err); 1416 struct svc_sock *svsk = NULL; 1417 struct sockaddr_storage addr; 1418 struct sockaddr *sin = (struct sockaddr *)&addr; 1419 int salen; 1420 1421 if (!so) 1422 return err; 1423 err = -EAFNOSUPPORT; 1424 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) 1425 goto out; 1426 err = -EPROTONOSUPPORT; 1427 if (so->sk->sk_protocol != IPPROTO_TCP && 1428 so->sk->sk_protocol != IPPROTO_UDP) 1429 goto out; 1430 err = -EISCONN; 1431 if (so->state > SS_UNCONNECTED) 1432 goto out; 1433 err = -ENOENT; 1434 if (!try_module_get(THIS_MODULE)) 1435 goto out; 1436 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); 1437 if (IS_ERR(svsk)) { 1438 module_put(THIS_MODULE); 1439 err = PTR_ERR(svsk); 1440 goto out; 1441 } 1442 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) 1443 svc_xprt_set_local(&svsk->sk_xprt, sin, salen); 1444 svc_add_new_perm_xprt(serv, &svsk->sk_xprt); 1445 return svc_one_sock_name(svsk, name_return, len); 1446 out: 1447 sockfd_put(so); 1448 return err; 1449 } 1450 EXPORT_SYMBOL_GPL(svc_addsock); 1451 1452 /* 1453 * Create socket for RPC service. 1454 */ 1455 static struct svc_xprt *svc_create_socket(struct svc_serv *serv, 1456 int protocol, 1457 struct net *net, 1458 struct sockaddr *sin, int len, 1459 int flags) 1460 { 1461 struct svc_sock *svsk; 1462 struct socket *sock; 1463 int error; 1464 int type; 1465 struct sockaddr_storage addr; 1466 struct sockaddr *newsin = (struct sockaddr *)&addr; 1467 int newlen; 1468 int family; 1469 int val; 1470 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 1471 1472 dprintk("svc: svc_create_socket(%s, %d, %s)\n", 1473 serv->sv_program->pg_name, protocol, 1474 __svc_print_addr(sin, buf, sizeof(buf))); 1475 1476 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { 1477 printk(KERN_WARNING "svc: only UDP and TCP " 1478 "sockets supported\n"); 1479 return ERR_PTR(-EINVAL); 1480 } 1481 1482 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; 1483 switch (sin->sa_family) { 1484 case AF_INET6: 1485 family = PF_INET6; 1486 break; 1487 case AF_INET: 1488 family = PF_INET; 1489 break; 1490 default: 1491 return ERR_PTR(-EINVAL); 1492 } 1493 1494 error = __sock_create(net, family, type, protocol, &sock, 1); 1495 if (error < 0) 1496 return ERR_PTR(error); 1497 1498 svc_reclassify_socket(sock); 1499 1500 /* 1501 * If this is an PF_INET6 listener, we want to avoid 1502 * getting requests from IPv4 remotes. Those should 1503 * be shunted to a PF_INET listener via rpcbind. 1504 */ 1505 val = 1; 1506 if (family == PF_INET6) 1507 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, 1508 (char *)&val, sizeof(val)); 1509 1510 if (type == SOCK_STREAM) 1511 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ 1512 error = kernel_bind(sock, sin, len); 1513 if (error < 0) 1514 goto bummer; 1515 1516 newlen = len; 1517 error = kernel_getsockname(sock, newsin, &newlen); 1518 if (error < 0) 1519 goto bummer; 1520 1521 if (protocol == IPPROTO_TCP) { 1522 if ((error = kernel_listen(sock, 64)) < 0) 1523 goto bummer; 1524 } 1525 1526 svsk = svc_setup_socket(serv, sock, flags); 1527 if (IS_ERR(svsk)) { 1528 error = PTR_ERR(svsk); 1529 goto bummer; 1530 } 1531 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); 1532 return (struct svc_xprt *)svsk; 1533 bummer: 1534 dprintk("svc: svc_create_socket error = %d\n", -error); 1535 sock_release(sock); 1536 return ERR_PTR(error); 1537 } 1538 1539 /* 1540 * Detach the svc_sock from the socket so that no 1541 * more callbacks occur. 1542 */ 1543 static void svc_sock_detach(struct svc_xprt *xprt) 1544 { 1545 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1546 struct sock *sk = svsk->sk_sk; 1547 wait_queue_head_t *wq; 1548 1549 dprintk("svc: svc_sock_detach(%p)\n", svsk); 1550 1551 /* put back the old socket callbacks */ 1552 sk->sk_state_change = svsk->sk_ostate; 1553 sk->sk_data_ready = svsk->sk_odata; 1554 sk->sk_write_space = svsk->sk_owspace; 1555 1556 wq = sk_sleep(sk); 1557 if (wq && waitqueue_active(wq)) 1558 wake_up_interruptible(wq); 1559 } 1560 1561 /* 1562 * Disconnect the socket, and reset the callbacks 1563 */ 1564 static void svc_tcp_sock_detach(struct svc_xprt *xprt) 1565 { 1566 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1567 1568 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); 1569 1570 svc_sock_detach(xprt); 1571 1572 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 1573 svc_tcp_clear_pages(svsk); 1574 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); 1575 } 1576 } 1577 1578 /* 1579 * Free the svc_sock's socket resources and the svc_sock itself. 1580 */ 1581 static void svc_sock_free(struct svc_xprt *xprt) 1582 { 1583 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1584 dprintk("svc: svc_sock_free(%p)\n", svsk); 1585 1586 if (svsk->sk_sock->file) 1587 sockfd_put(svsk->sk_sock); 1588 else 1589 sock_release(svsk->sk_sock); 1590 kfree(svsk); 1591 } 1592 1593 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1594 /* 1595 * Create a back channel svc_xprt which shares the fore channel socket. 1596 */ 1597 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, 1598 int protocol, 1599 struct net *net, 1600 struct sockaddr *sin, int len, 1601 int flags) 1602 { 1603 struct svc_sock *svsk; 1604 struct svc_xprt *xprt; 1605 1606 if (protocol != IPPROTO_TCP) { 1607 printk(KERN_WARNING "svc: only TCP sockets" 1608 " supported on shared back channel\n"); 1609 return ERR_PTR(-EINVAL); 1610 } 1611 1612 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1613 if (!svsk) 1614 return ERR_PTR(-ENOMEM); 1615 1616 xprt = &svsk->sk_xprt; 1617 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); 1618 1619 serv->sv_bc_xprt = xprt; 1620 1621 return xprt; 1622 } 1623 1624 /* 1625 * Free a back channel svc_sock. 1626 */ 1627 static void svc_bc_sock_free(struct svc_xprt *xprt) 1628 { 1629 if (xprt) 1630 kfree(container_of(xprt, struct svc_sock, sk_xprt)); 1631 } 1632 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1633