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 case PF_INET6: 295 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", 296 proto_name, 297 &inet6_sk(sk)->rcv_saddr, 298 inet_sk(sk)->inet_num); 299 break; 300 default: 301 len = snprintf(buf, remaining, "*unknown-%d*\n", 302 sk->sk_family); 303 } 304 305 if (len >= remaining) { 306 *buf = '\0'; 307 return -ENAMETOOLONG; 308 } 309 return len; 310 } 311 312 /* 313 * Check input queue length 314 */ 315 static int svc_recv_available(struct svc_sock *svsk) 316 { 317 struct socket *sock = svsk->sk_sock; 318 int avail, err; 319 320 err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); 321 322 return (err >= 0)? avail : err; 323 } 324 325 /* 326 * Generic recvfrom routine. 327 */ 328 static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, 329 int buflen) 330 { 331 struct svc_sock *svsk = 332 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 333 struct msghdr msg = { 334 .msg_flags = MSG_DONTWAIT, 335 }; 336 int len; 337 338 rqstp->rq_xprt_hlen = 0; 339 340 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, 341 msg.msg_flags); 342 343 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", 344 svsk, iov[0].iov_base, iov[0].iov_len, len); 345 return len; 346 } 347 348 static int svc_partial_recvfrom(struct svc_rqst *rqstp, 349 struct kvec *iov, int nr, 350 int buflen, unsigned int base) 351 { 352 size_t save_iovlen; 353 void *save_iovbase; 354 unsigned int i; 355 int ret; 356 357 if (base == 0) 358 return svc_recvfrom(rqstp, iov, nr, buflen); 359 360 for (i = 0; i < nr; i++) { 361 if (iov[i].iov_len > base) 362 break; 363 base -= iov[i].iov_len; 364 } 365 save_iovlen = iov[i].iov_len; 366 save_iovbase = iov[i].iov_base; 367 iov[i].iov_len -= base; 368 iov[i].iov_base += base; 369 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); 370 iov[i].iov_len = save_iovlen; 371 iov[i].iov_base = save_iovbase; 372 return ret; 373 } 374 375 /* 376 * Set socket snd and rcv buffer lengths 377 */ 378 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, 379 unsigned int rcv) 380 { 381 #if 0 382 mm_segment_t oldfs; 383 oldfs = get_fs(); set_fs(KERNEL_DS); 384 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, 385 (char*)&snd, sizeof(snd)); 386 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 387 (char*)&rcv, sizeof(rcv)); 388 #else 389 /* sock_setsockopt limits use to sysctl_?mem_max, 390 * which isn't acceptable. Until that is made conditional 391 * on not having CAP_SYS_RESOURCE or similar, we go direct... 392 * DaveM said I could! 393 */ 394 lock_sock(sock->sk); 395 sock->sk->sk_sndbuf = snd * 2; 396 sock->sk->sk_rcvbuf = rcv * 2; 397 sock->sk->sk_write_space(sock->sk); 398 release_sock(sock->sk); 399 #endif 400 } 401 /* 402 * INET callback when data has been received on the socket. 403 */ 404 static void svc_udp_data_ready(struct sock *sk, int count) 405 { 406 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 407 wait_queue_head_t *wq = sk_sleep(sk); 408 409 if (svsk) { 410 dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", 411 svsk, sk, count, 412 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 413 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 414 svc_xprt_enqueue(&svsk->sk_xprt); 415 } 416 if (wq && waitqueue_active(wq)) 417 wake_up_interruptible(wq); 418 } 419 420 /* 421 * INET callback when space is newly available on the socket. 422 */ 423 static void svc_write_space(struct sock *sk) 424 { 425 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); 426 wait_queue_head_t *wq = sk_sleep(sk); 427 428 if (svsk) { 429 dprintk("svc: socket %p(inet %p), write_space busy=%d\n", 430 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); 431 svc_xprt_enqueue(&svsk->sk_xprt); 432 } 433 434 if (wq && waitqueue_active(wq)) { 435 dprintk("RPC svc_write_space: someone sleeping on %p\n", 436 svsk); 437 wake_up_interruptible(wq); 438 } 439 } 440 441 static void svc_tcp_write_space(struct sock *sk) 442 { 443 struct socket *sock = sk->sk_socket; 444 445 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) 446 clear_bit(SOCK_NOSPACE, &sock->flags); 447 svc_write_space(sk); 448 } 449 450 /* 451 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo 452 */ 453 static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, 454 struct cmsghdr *cmh) 455 { 456 struct in_pktinfo *pki = CMSG_DATA(cmh); 457 struct sockaddr_in *daddr = svc_daddr_in(rqstp); 458 459 if (cmh->cmsg_type != IP_PKTINFO) 460 return 0; 461 462 daddr->sin_family = AF_INET; 463 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; 464 return 1; 465 } 466 467 /* 468 * See net/ipv6/datagram.c : datagram_recv_ctl 469 */ 470 static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, 471 struct cmsghdr *cmh) 472 { 473 struct in6_pktinfo *pki = CMSG_DATA(cmh); 474 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); 475 476 if (cmh->cmsg_type != IPV6_PKTINFO) 477 return 0; 478 479 daddr->sin6_family = AF_INET6; 480 daddr->sin6_addr = pki->ipi6_addr; 481 daddr->sin6_scope_id = pki->ipi6_ifindex; 482 return 1; 483 } 484 485 /* 486 * Copy the UDP datagram's destination address to the rqstp structure. 487 * The 'destination' address in this case is the address to which the 488 * peer sent the datagram, i.e. our local address. For multihomed 489 * hosts, this can change from msg to msg. Note that only the IP 490 * address changes, the port number should remain the same. 491 */ 492 static int svc_udp_get_dest_address(struct svc_rqst *rqstp, 493 struct cmsghdr *cmh) 494 { 495 switch (cmh->cmsg_level) { 496 case SOL_IP: 497 return svc_udp_get_dest_address4(rqstp, cmh); 498 case SOL_IPV6: 499 return svc_udp_get_dest_address6(rqstp, cmh); 500 } 501 502 return 0; 503 } 504 505 /* 506 * Receive a datagram from a UDP socket. 507 */ 508 static int svc_udp_recvfrom(struct svc_rqst *rqstp) 509 { 510 struct svc_sock *svsk = 511 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); 512 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 513 struct sk_buff *skb; 514 union { 515 struct cmsghdr hdr; 516 long all[SVC_PKTINFO_SPACE / sizeof(long)]; 517 } buffer; 518 struct cmsghdr *cmh = &buffer.hdr; 519 struct msghdr msg = { 520 .msg_name = svc_addr(rqstp), 521 .msg_control = cmh, 522 .msg_controllen = sizeof(buffer), 523 .msg_flags = MSG_DONTWAIT, 524 }; 525 size_t len; 526 int err; 527 528 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) 529 /* udp sockets need large rcvbuf as all pending 530 * requests are still in that buffer. sndbuf must 531 * also be large enough that there is enough space 532 * for one reply per thread. We count all threads 533 * rather than threads in a particular pool, which 534 * provides an upper bound on the number of threads 535 * which will access the socket. 536 */ 537 svc_sock_setbufsize(svsk->sk_sock, 538 (serv->sv_nrthreads+3) * serv->sv_max_mesg, 539 (serv->sv_nrthreads+3) * serv->sv_max_mesg); 540 541 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 542 skb = NULL; 543 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, 544 0, 0, MSG_PEEK | MSG_DONTWAIT); 545 if (err >= 0) 546 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); 547 548 if (skb == NULL) { 549 if (err != -EAGAIN) { 550 /* possibly an icmp error */ 551 dprintk("svc: recvfrom returned error %d\n", -err); 552 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 553 } 554 return 0; 555 } 556 len = svc_addr_len(svc_addr(rqstp)); 557 rqstp->rq_addrlen = len; 558 if (skb->tstamp.tv64 == 0) { 559 skb->tstamp = ktime_get_real(); 560 /* Don't enable netstamp, sunrpc doesn't 561 need that much accuracy */ 562 } 563 svsk->sk_sk->sk_stamp = skb->tstamp; 564 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ 565 566 len = skb->len - sizeof(struct udphdr); 567 rqstp->rq_arg.len = len; 568 569 rqstp->rq_prot = IPPROTO_UDP; 570 571 if (!svc_udp_get_dest_address(rqstp, cmh)) { 572 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", 573 cmh->cmsg_level, cmh->cmsg_type); 574 goto out_free; 575 } 576 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); 577 578 if (skb_is_nonlinear(skb)) { 579 /* we have to copy */ 580 local_bh_disable(); 581 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { 582 local_bh_enable(); 583 /* checksum error */ 584 goto out_free; 585 } 586 local_bh_enable(); 587 skb_free_datagram_locked(svsk->sk_sk, skb); 588 } else { 589 /* we can use it in-place */ 590 rqstp->rq_arg.head[0].iov_base = skb->data + 591 sizeof(struct udphdr); 592 rqstp->rq_arg.head[0].iov_len = len; 593 if (skb_checksum_complete(skb)) 594 goto out_free; 595 rqstp->rq_xprt_ctxt = skb; 596 } 597 598 rqstp->rq_arg.page_base = 0; 599 if (len <= rqstp->rq_arg.head[0].iov_len) { 600 rqstp->rq_arg.head[0].iov_len = len; 601 rqstp->rq_arg.page_len = 0; 602 rqstp->rq_respages = rqstp->rq_pages+1; 603 } else { 604 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; 605 rqstp->rq_respages = rqstp->rq_pages + 1 + 606 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); 607 } 608 609 if (serv->sv_stats) 610 serv->sv_stats->netudpcnt++; 611 612 return len; 613 out_free: 614 trace_kfree_skb(skb, svc_udp_recvfrom); 615 skb_free_datagram_locked(svsk->sk_sk, skb); 616 return 0; 617 } 618 619 static int 620 svc_udp_sendto(struct svc_rqst *rqstp) 621 { 622 int error; 623 624 error = svc_sendto(rqstp, &rqstp->rq_res); 625 if (error == -ECONNREFUSED) 626 /* ICMP error on earlier request. */ 627 error = svc_sendto(rqstp, &rqstp->rq_res); 628 629 return error; 630 } 631 632 static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) 633 { 634 } 635 636 static int svc_udp_has_wspace(struct svc_xprt *xprt) 637 { 638 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 639 struct svc_serv *serv = xprt->xpt_server; 640 unsigned long required; 641 642 /* 643 * Set the SOCK_NOSPACE flag before checking the available 644 * sock space. 645 */ 646 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 647 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; 648 if (required*2 > sock_wspace(svsk->sk_sk)) 649 return 0; 650 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 651 return 1; 652 } 653 654 static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) 655 { 656 BUG(); 657 return NULL; 658 } 659 660 static struct svc_xprt *svc_udp_create(struct svc_serv *serv, 661 struct net *net, 662 struct sockaddr *sa, int salen, 663 int flags) 664 { 665 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); 666 } 667 668 static struct svc_xprt_ops svc_udp_ops = { 669 .xpo_create = svc_udp_create, 670 .xpo_recvfrom = svc_udp_recvfrom, 671 .xpo_sendto = svc_udp_sendto, 672 .xpo_release_rqst = svc_release_skb, 673 .xpo_detach = svc_sock_detach, 674 .xpo_free = svc_sock_free, 675 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, 676 .xpo_has_wspace = svc_udp_has_wspace, 677 .xpo_accept = svc_udp_accept, 678 }; 679 680 static struct svc_xprt_class svc_udp_class = { 681 .xcl_name = "udp", 682 .xcl_owner = THIS_MODULE, 683 .xcl_ops = &svc_udp_ops, 684 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, 685 }; 686 687 static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) 688 { 689 int err, level, optname, one = 1; 690 691 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, 692 &svsk->sk_xprt, serv); 693 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 694 svsk->sk_sk->sk_data_ready = svc_udp_data_ready; 695 svsk->sk_sk->sk_write_space = svc_write_space; 696 697 /* initialise setting must have enough space to 698 * receive and respond to one request. 699 * svc_udp_recvfrom will re-adjust if necessary 700 */ 701 svc_sock_setbufsize(svsk->sk_sock, 702 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, 703 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); 704 705 /* data might have come in before data_ready set up */ 706 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 707 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 708 709 /* make sure we get destination address info */ 710 switch (svsk->sk_sk->sk_family) { 711 case AF_INET: 712 level = SOL_IP; 713 optname = IP_PKTINFO; 714 break; 715 case AF_INET6: 716 level = SOL_IPV6; 717 optname = IPV6_RECVPKTINFO; 718 break; 719 default: 720 BUG(); 721 } 722 err = kernel_setsockopt(svsk->sk_sock, level, optname, 723 (char *)&one, sizeof(one)); 724 dprintk("svc: kernel_setsockopt returned %d\n", err); 725 } 726 727 /* 728 * A data_ready event on a listening socket means there's a connection 729 * pending. Do not use state_change as a substitute for it. 730 */ 731 static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) 732 { 733 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 734 wait_queue_head_t *wq; 735 736 dprintk("svc: socket %p TCP (listen) state change %d\n", 737 sk, sk->sk_state); 738 739 /* 740 * This callback may called twice when a new connection 741 * is established as a child socket inherits everything 742 * from a parent LISTEN socket. 743 * 1) data_ready method of the parent socket will be called 744 * when one of child sockets become ESTABLISHED. 745 * 2) data_ready method of the child socket may be called 746 * when it receives data before the socket is accepted. 747 * In case of 2, we should ignore it silently. 748 */ 749 if (sk->sk_state == TCP_LISTEN) { 750 if (svsk) { 751 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 752 svc_xprt_enqueue(&svsk->sk_xprt); 753 } else 754 printk("svc: socket %p: no user data\n", sk); 755 } 756 757 wq = sk_sleep(sk); 758 if (wq && waitqueue_active(wq)) 759 wake_up_interruptible_all(wq); 760 } 761 762 /* 763 * A state change on a connected socket means it's dying or dead. 764 */ 765 static void svc_tcp_state_change(struct sock *sk) 766 { 767 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 768 wait_queue_head_t *wq = sk_sleep(sk); 769 770 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", 771 sk, sk->sk_state, sk->sk_user_data); 772 773 if (!svsk) 774 printk("svc: socket %p: no user data\n", sk); 775 else { 776 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 777 svc_xprt_enqueue(&svsk->sk_xprt); 778 } 779 if (wq && waitqueue_active(wq)) 780 wake_up_interruptible_all(wq); 781 } 782 783 static void svc_tcp_data_ready(struct sock *sk, int count) 784 { 785 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; 786 wait_queue_head_t *wq = sk_sleep(sk); 787 788 dprintk("svc: socket %p TCP data ready (svsk %p)\n", 789 sk, sk->sk_user_data); 790 if (svsk) { 791 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 792 svc_xprt_enqueue(&svsk->sk_xprt); 793 } 794 if (wq && waitqueue_active(wq)) 795 wake_up_interruptible(wq); 796 } 797 798 /* 799 * Accept a TCP connection 800 */ 801 static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) 802 { 803 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 804 struct sockaddr_storage addr; 805 struct sockaddr *sin = (struct sockaddr *) &addr; 806 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 807 struct socket *sock = svsk->sk_sock; 808 struct socket *newsock; 809 struct svc_sock *newsvsk; 810 int err, slen; 811 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 812 813 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); 814 if (!sock) 815 return NULL; 816 817 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 818 err = kernel_accept(sock, &newsock, O_NONBLOCK); 819 if (err < 0) { 820 if (err == -ENOMEM) 821 printk(KERN_WARNING "%s: no more sockets!\n", 822 serv->sv_name); 823 else if (err != -EAGAIN) 824 net_warn_ratelimited("%s: accept failed (err %d)!\n", 825 serv->sv_name, -err); 826 return NULL; 827 } 828 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 829 830 err = kernel_getpeername(newsock, sin, &slen); 831 if (err < 0) { 832 net_warn_ratelimited("%s: peername failed (err %d)!\n", 833 serv->sv_name, -err); 834 goto failed; /* aborted connection or whatever */ 835 } 836 837 /* Ideally, we would want to reject connections from unauthorized 838 * hosts here, but when we get encryption, the IP of the host won't 839 * tell us anything. For now just warn about unpriv connections. 840 */ 841 if (!svc_port_is_privileged(sin)) { 842 dprintk(KERN_WARNING 843 "%s: connect from unprivileged port: %s\n", 844 serv->sv_name, 845 __svc_print_addr(sin, buf, sizeof(buf))); 846 } 847 dprintk("%s: connect from %s\n", serv->sv_name, 848 __svc_print_addr(sin, buf, sizeof(buf))); 849 850 /* make sure that a write doesn't block forever when 851 * low on memory 852 */ 853 newsock->sk->sk_sndtimeo = HZ*30; 854 855 newsvsk = svc_setup_socket(serv, newsock, 856 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); 857 if (IS_ERR(newsvsk)) 858 goto failed; 859 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); 860 err = kernel_getsockname(newsock, sin, &slen); 861 if (unlikely(err < 0)) { 862 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); 863 slen = offsetof(struct sockaddr, sa_data); 864 } 865 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); 866 867 if (serv->sv_stats) 868 serv->sv_stats->nettcpconn++; 869 870 return &newsvsk->sk_xprt; 871 872 failed: 873 sock_release(newsock); 874 return NULL; 875 } 876 877 static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 878 { 879 unsigned int i, len, npages; 880 881 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 882 return 0; 883 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 884 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 885 for (i = 0; i < npages; i++) { 886 if (rqstp->rq_pages[i] != NULL) 887 put_page(rqstp->rq_pages[i]); 888 BUG_ON(svsk->sk_pages[i] == NULL); 889 rqstp->rq_pages[i] = svsk->sk_pages[i]; 890 svsk->sk_pages[i] = NULL; 891 } 892 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); 893 return len; 894 } 895 896 static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) 897 { 898 unsigned int i, len, npages; 899 900 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 901 return; 902 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 903 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 904 for (i = 0; i < npages; i++) { 905 svsk->sk_pages[i] = rqstp->rq_pages[i]; 906 rqstp->rq_pages[i] = NULL; 907 } 908 } 909 910 static void svc_tcp_clear_pages(struct svc_sock *svsk) 911 { 912 unsigned int i, len, npages; 913 914 if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) 915 goto out; 916 len = svsk->sk_tcplen - sizeof(rpc_fraghdr); 917 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 918 for (i = 0; i < npages; i++) { 919 BUG_ON(svsk->sk_pages[i] == NULL); 920 put_page(svsk->sk_pages[i]); 921 svsk->sk_pages[i] = NULL; 922 } 923 out: 924 svsk->sk_tcplen = 0; 925 } 926 927 /* 928 * Receive data. 929 * If we haven't gotten the record length yet, get the next four bytes. 930 * Otherwise try to gobble up as much as possible up to the complete 931 * record length. 932 */ 933 static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) 934 { 935 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 936 unsigned int want; 937 int len; 938 939 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 940 941 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { 942 struct kvec iov; 943 944 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; 945 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; 946 iov.iov_len = want; 947 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) 948 goto error; 949 svsk->sk_tcplen += len; 950 951 if (len < want) { 952 dprintk("svc: short recvfrom while reading record " 953 "length (%d of %d)\n", len, want); 954 return -EAGAIN; 955 } 956 957 svsk->sk_reclen = ntohl(svsk->sk_reclen); 958 if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { 959 /* FIXME: technically, a record can be fragmented, 960 * and non-terminal fragments will not have the top 961 * bit set in the fragment length header. 962 * But apparently no known nfs clients send fragmented 963 * records. */ 964 net_notice_ratelimited("RPC: multiple fragments per record not supported\n"); 965 goto err_delete; 966 } 967 968 svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; 969 dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); 970 if (svsk->sk_reclen > serv->sv_max_mesg) { 971 net_notice_ratelimited("RPC: fragment too large: 0x%08lx\n", 972 (unsigned long)svsk->sk_reclen); 973 goto err_delete; 974 } 975 } 976 977 if (svsk->sk_reclen < 8) 978 goto err_delete; /* client is nuts. */ 979 980 len = svsk->sk_reclen; 981 982 return len; 983 error: 984 dprintk("RPC: TCP recv_record got %d\n", len); 985 return len; 986 err_delete: 987 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 988 return -EAGAIN; 989 } 990 991 static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) 992 { 993 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; 994 struct rpc_rqst *req = NULL; 995 struct kvec *src, *dst; 996 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 997 __be32 xid; 998 __be32 calldir; 999 1000 xid = *p++; 1001 calldir = *p; 1002 1003 if (bc_xprt) 1004 req = xprt_lookup_rqst(bc_xprt, xid); 1005 1006 if (!req) { 1007 printk(KERN_NOTICE 1008 "%s: Got unrecognized reply: " 1009 "calldir 0x%x xpt_bc_xprt %p xid %08x\n", 1010 __func__, ntohl(calldir), 1011 bc_xprt, xid); 1012 return -EAGAIN; 1013 } 1014 1015 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); 1016 /* 1017 * XXX!: cheating for now! Only copying HEAD. 1018 * But we know this is good enough for now (in fact, for any 1019 * callback reply in the forseeable future). 1020 */ 1021 dst = &req->rq_private_buf.head[0]; 1022 src = &rqstp->rq_arg.head[0]; 1023 if (dst->iov_len < src->iov_len) 1024 return -EAGAIN; /* whatever; just giving up. */ 1025 memcpy(dst->iov_base, src->iov_base, src->iov_len); 1026 xprt_complete_rqst(req->rq_task, svsk->sk_reclen); 1027 rqstp->rq_arg.len = 0; 1028 return 0; 1029 } 1030 1031 static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) 1032 { 1033 int i = 0; 1034 int t = 0; 1035 1036 while (t < len) { 1037 vec[i].iov_base = page_address(pages[i]); 1038 vec[i].iov_len = PAGE_SIZE; 1039 i++; 1040 t += PAGE_SIZE; 1041 } 1042 return i; 1043 } 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 = svsk->sk_reclen - base; 1072 1073 vec = rqstp->rq_vec; 1074 1075 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], 1076 svsk->sk_reclen); 1077 1078 rqstp->rq_respages = &rqstp->rq_pages[pnum]; 1079 1080 /* Now receive data */ 1081 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); 1082 if (len >= 0) 1083 svsk->sk_tcplen += len; 1084 if (len != want) { 1085 svc_tcp_save_pages(svsk, rqstp); 1086 if (len < 0 && len != -EAGAIN) 1087 goto err_other; 1088 dprintk("svc: incomplete TCP record (%d of %d)\n", 1089 svsk->sk_tcplen, svsk->sk_reclen); 1090 goto err_noclose; 1091 } 1092 1093 rqstp->rq_arg.len = svsk->sk_reclen; 1094 rqstp->rq_arg.page_base = 0; 1095 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { 1096 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; 1097 rqstp->rq_arg.page_len = 0; 1098 } else 1099 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; 1100 1101 rqstp->rq_xprt_ctxt = NULL; 1102 rqstp->rq_prot = IPPROTO_TCP; 1103 1104 p = (__be32 *)rqstp->rq_arg.head[0].iov_base; 1105 calldir = p[1]; 1106 if (calldir) 1107 len = receive_cb_reply(svsk, rqstp); 1108 1109 /* Reset TCP read info */ 1110 svsk->sk_reclen = 0; 1111 svsk->sk_tcplen = 0; 1112 /* If we have more data, signal svc_xprt_enqueue() to try again */ 1113 if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) 1114 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1115 1116 if (len < 0) 1117 goto error; 1118 1119 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); 1120 if (serv->sv_stats) 1121 serv->sv_stats->nettcpcnt++; 1122 1123 dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); 1124 return rqstp->rq_arg.len; 1125 1126 error: 1127 if (len != -EAGAIN) 1128 goto err_other; 1129 dprintk("RPC: TCP recvfrom got EAGAIN\n"); 1130 return 0; 1131 err_other: 1132 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", 1133 svsk->sk_xprt.xpt_server->sv_name, -len); 1134 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1135 err_noclose: 1136 return 0; /* record not complete */ 1137 } 1138 1139 /* 1140 * Send out data on TCP socket. 1141 */ 1142 static int svc_tcp_sendto(struct svc_rqst *rqstp) 1143 { 1144 struct xdr_buf *xbufp = &rqstp->rq_res; 1145 int sent; 1146 __be32 reclen; 1147 1148 /* Set up the first element of the reply kvec. 1149 * Any other kvecs that may be in use have been taken 1150 * care of by the server implementation itself. 1151 */ 1152 reclen = htonl(0x80000000|((xbufp->len ) - 4)); 1153 memcpy(xbufp->head[0].iov_base, &reclen, 4); 1154 1155 sent = svc_sendto(rqstp, &rqstp->rq_res); 1156 if (sent != xbufp->len) { 1157 printk(KERN_NOTICE 1158 "rpc-srv/tcp: %s: %s %d when sending %d bytes " 1159 "- shutting down socket\n", 1160 rqstp->rq_xprt->xpt_server->sv_name, 1161 (sent<0)?"got error":"sent only", 1162 sent, xbufp->len); 1163 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); 1164 svc_xprt_enqueue(rqstp->rq_xprt); 1165 sent = -EAGAIN; 1166 } 1167 return sent; 1168 } 1169 1170 /* 1171 * Setup response header. TCP has a 4B record length field. 1172 */ 1173 static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) 1174 { 1175 struct kvec *resv = &rqstp->rq_res.head[0]; 1176 1177 /* tcp needs a space for the record length... */ 1178 svc_putnl(resv, 0); 1179 } 1180 1181 static int svc_tcp_has_wspace(struct svc_xprt *xprt) 1182 { 1183 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1184 struct svc_serv *serv = svsk->sk_xprt.xpt_server; 1185 int required; 1186 1187 if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) 1188 return 1; 1189 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; 1190 if (sk_stream_wspace(svsk->sk_sk) >= required) 1191 return 1; 1192 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); 1193 return 0; 1194 } 1195 1196 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, 1197 struct net *net, 1198 struct sockaddr *sa, int salen, 1199 int flags) 1200 { 1201 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1202 } 1203 1204 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1205 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, 1206 struct net *, struct sockaddr *, 1207 int, int); 1208 static void svc_bc_sock_free(struct svc_xprt *xprt); 1209 1210 static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, 1211 struct net *net, 1212 struct sockaddr *sa, int salen, 1213 int flags) 1214 { 1215 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); 1216 } 1217 1218 static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) 1219 { 1220 } 1221 1222 static struct svc_xprt_ops svc_tcp_bc_ops = { 1223 .xpo_create = svc_bc_tcp_create, 1224 .xpo_detach = svc_bc_tcp_sock_detach, 1225 .xpo_free = svc_bc_sock_free, 1226 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1227 }; 1228 1229 static struct svc_xprt_class svc_tcp_bc_class = { 1230 .xcl_name = "tcp-bc", 1231 .xcl_owner = THIS_MODULE, 1232 .xcl_ops = &svc_tcp_bc_ops, 1233 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1234 }; 1235 1236 static void svc_init_bc_xprt_sock(void) 1237 { 1238 svc_reg_xprt_class(&svc_tcp_bc_class); 1239 } 1240 1241 static void svc_cleanup_bc_xprt_sock(void) 1242 { 1243 svc_unreg_xprt_class(&svc_tcp_bc_class); 1244 } 1245 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 1246 static void svc_init_bc_xprt_sock(void) 1247 { 1248 } 1249 1250 static void svc_cleanup_bc_xprt_sock(void) 1251 { 1252 } 1253 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1254 1255 static struct svc_xprt_ops svc_tcp_ops = { 1256 .xpo_create = svc_tcp_create, 1257 .xpo_recvfrom = svc_tcp_recvfrom, 1258 .xpo_sendto = svc_tcp_sendto, 1259 .xpo_release_rqst = svc_release_skb, 1260 .xpo_detach = svc_tcp_sock_detach, 1261 .xpo_free = svc_sock_free, 1262 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, 1263 .xpo_has_wspace = svc_tcp_has_wspace, 1264 .xpo_accept = svc_tcp_accept, 1265 }; 1266 1267 static struct svc_xprt_class svc_tcp_class = { 1268 .xcl_name = "tcp", 1269 .xcl_owner = THIS_MODULE, 1270 .xcl_ops = &svc_tcp_ops, 1271 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, 1272 }; 1273 1274 void svc_init_xprt_sock(void) 1275 { 1276 svc_reg_xprt_class(&svc_tcp_class); 1277 svc_reg_xprt_class(&svc_udp_class); 1278 svc_init_bc_xprt_sock(); 1279 } 1280 1281 void svc_cleanup_xprt_sock(void) 1282 { 1283 svc_unreg_xprt_class(&svc_tcp_class); 1284 svc_unreg_xprt_class(&svc_udp_class); 1285 svc_cleanup_bc_xprt_sock(); 1286 } 1287 1288 static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) 1289 { 1290 struct sock *sk = svsk->sk_sk; 1291 1292 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, 1293 &svsk->sk_xprt, serv); 1294 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); 1295 if (sk->sk_state == TCP_LISTEN) { 1296 dprintk("setting up TCP socket for listening\n"); 1297 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); 1298 sk->sk_data_ready = svc_tcp_listen_data_ready; 1299 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); 1300 } else { 1301 dprintk("setting up TCP socket for reading\n"); 1302 sk->sk_state_change = svc_tcp_state_change; 1303 sk->sk_data_ready = svc_tcp_data_ready; 1304 sk->sk_write_space = svc_tcp_write_space; 1305 1306 svsk->sk_reclen = 0; 1307 svsk->sk_tcplen = 0; 1308 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); 1309 1310 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1311 1312 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1313 if (sk->sk_state != TCP_ESTABLISHED) 1314 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1315 } 1316 } 1317 1318 void svc_sock_update_bufs(struct svc_serv *serv) 1319 { 1320 /* 1321 * The number of server threads has changed. Update 1322 * rcvbuf and sndbuf accordingly on all sockets 1323 */ 1324 struct svc_sock *svsk; 1325 1326 spin_lock_bh(&serv->sv_lock); 1327 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) 1328 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); 1329 spin_unlock_bh(&serv->sv_lock); 1330 } 1331 EXPORT_SYMBOL_GPL(svc_sock_update_bufs); 1332 1333 /* 1334 * Initialize socket for RPC use and create svc_sock struct 1335 * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. 1336 */ 1337 static struct svc_sock *svc_setup_socket(struct svc_serv *serv, 1338 struct socket *sock, 1339 int flags) 1340 { 1341 struct svc_sock *svsk; 1342 struct sock *inet; 1343 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); 1344 int err = 0; 1345 1346 dprintk("svc: svc_setup_socket %p\n", sock); 1347 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1348 if (!svsk) 1349 return ERR_PTR(-ENOMEM); 1350 1351 inet = sock->sk; 1352 1353 /* Register socket with portmapper */ 1354 if (pmap_register) 1355 err = svc_register(serv, sock_net(sock->sk), inet->sk_family, 1356 inet->sk_protocol, 1357 ntohs(inet_sk(inet)->inet_sport)); 1358 1359 if (err < 0) { 1360 kfree(svsk); 1361 return ERR_PTR(err); 1362 } 1363 1364 inet->sk_user_data = svsk; 1365 svsk->sk_sock = sock; 1366 svsk->sk_sk = inet; 1367 svsk->sk_ostate = inet->sk_state_change; 1368 svsk->sk_odata = inet->sk_data_ready; 1369 svsk->sk_owspace = inet->sk_write_space; 1370 1371 /* Initialize the socket */ 1372 if (sock->type == SOCK_DGRAM) 1373 svc_udp_init(svsk, serv); 1374 else { 1375 /* initialise setting must have enough space to 1376 * receive and respond to one request. 1377 */ 1378 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, 1379 4 * serv->sv_max_mesg); 1380 svc_tcp_init(svsk, serv); 1381 } 1382 1383 dprintk("svc: svc_setup_socket created %p (inet %p)\n", 1384 svsk, svsk->sk_sk); 1385 1386 return svsk; 1387 } 1388 1389 /** 1390 * svc_addsock - add a listener socket to an RPC service 1391 * @serv: pointer to RPC service to which to add a new listener 1392 * @fd: file descriptor of the new listener 1393 * @name_return: pointer to buffer to fill in with name of listener 1394 * @len: size of the buffer 1395 * 1396 * Fills in socket name and returns positive length of name if successful. 1397 * Name is terminated with '\n'. On error, returns a negative errno 1398 * value. 1399 */ 1400 int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, 1401 const size_t len) 1402 { 1403 int err = 0; 1404 struct socket *so = sockfd_lookup(fd, &err); 1405 struct svc_sock *svsk = NULL; 1406 struct sockaddr_storage addr; 1407 struct sockaddr *sin = (struct sockaddr *)&addr; 1408 int salen; 1409 1410 if (!so) 1411 return err; 1412 err = -EAFNOSUPPORT; 1413 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) 1414 goto out; 1415 err = -EPROTONOSUPPORT; 1416 if (so->sk->sk_protocol != IPPROTO_TCP && 1417 so->sk->sk_protocol != IPPROTO_UDP) 1418 goto out; 1419 err = -EISCONN; 1420 if (so->state > SS_UNCONNECTED) 1421 goto out; 1422 err = -ENOENT; 1423 if (!try_module_get(THIS_MODULE)) 1424 goto out; 1425 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); 1426 if (IS_ERR(svsk)) { 1427 module_put(THIS_MODULE); 1428 err = PTR_ERR(svsk); 1429 goto out; 1430 } 1431 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) 1432 svc_xprt_set_local(&svsk->sk_xprt, sin, salen); 1433 svc_add_new_perm_xprt(serv, &svsk->sk_xprt); 1434 return svc_one_sock_name(svsk, name_return, len); 1435 out: 1436 sockfd_put(so); 1437 return err; 1438 } 1439 EXPORT_SYMBOL_GPL(svc_addsock); 1440 1441 /* 1442 * Create socket for RPC service. 1443 */ 1444 static struct svc_xprt *svc_create_socket(struct svc_serv *serv, 1445 int protocol, 1446 struct net *net, 1447 struct sockaddr *sin, int len, 1448 int flags) 1449 { 1450 struct svc_sock *svsk; 1451 struct socket *sock; 1452 int error; 1453 int type; 1454 struct sockaddr_storage addr; 1455 struct sockaddr *newsin = (struct sockaddr *)&addr; 1456 int newlen; 1457 int family; 1458 int val; 1459 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 1460 1461 dprintk("svc: svc_create_socket(%s, %d, %s)\n", 1462 serv->sv_program->pg_name, protocol, 1463 __svc_print_addr(sin, buf, sizeof(buf))); 1464 1465 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { 1466 printk(KERN_WARNING "svc: only UDP and TCP " 1467 "sockets supported\n"); 1468 return ERR_PTR(-EINVAL); 1469 } 1470 1471 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; 1472 switch (sin->sa_family) { 1473 case AF_INET6: 1474 family = PF_INET6; 1475 break; 1476 case AF_INET: 1477 family = PF_INET; 1478 break; 1479 default: 1480 return ERR_PTR(-EINVAL); 1481 } 1482 1483 error = __sock_create(net, family, type, protocol, &sock, 1); 1484 if (error < 0) 1485 return ERR_PTR(error); 1486 1487 svc_reclassify_socket(sock); 1488 1489 /* 1490 * If this is an PF_INET6 listener, we want to avoid 1491 * getting requests from IPv4 remotes. Those should 1492 * be shunted to a PF_INET listener via rpcbind. 1493 */ 1494 val = 1; 1495 if (family == PF_INET6) 1496 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, 1497 (char *)&val, sizeof(val)); 1498 1499 if (type == SOCK_STREAM) 1500 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ 1501 error = kernel_bind(sock, sin, len); 1502 if (error < 0) 1503 goto bummer; 1504 1505 newlen = len; 1506 error = kernel_getsockname(sock, newsin, &newlen); 1507 if (error < 0) 1508 goto bummer; 1509 1510 if (protocol == IPPROTO_TCP) { 1511 if ((error = kernel_listen(sock, 64)) < 0) 1512 goto bummer; 1513 } 1514 1515 svsk = svc_setup_socket(serv, sock, flags); 1516 if (IS_ERR(svsk)) { 1517 error = PTR_ERR(svsk); 1518 goto bummer; 1519 } 1520 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); 1521 return (struct svc_xprt *)svsk; 1522 bummer: 1523 dprintk("svc: svc_create_socket error = %d\n", -error); 1524 sock_release(sock); 1525 return ERR_PTR(error); 1526 } 1527 1528 /* 1529 * Detach the svc_sock from the socket so that no 1530 * more callbacks occur. 1531 */ 1532 static void svc_sock_detach(struct svc_xprt *xprt) 1533 { 1534 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1535 struct sock *sk = svsk->sk_sk; 1536 wait_queue_head_t *wq; 1537 1538 dprintk("svc: svc_sock_detach(%p)\n", svsk); 1539 1540 /* put back the old socket callbacks */ 1541 sk->sk_state_change = svsk->sk_ostate; 1542 sk->sk_data_ready = svsk->sk_odata; 1543 sk->sk_write_space = svsk->sk_owspace; 1544 1545 wq = sk_sleep(sk); 1546 if (wq && waitqueue_active(wq)) 1547 wake_up_interruptible(wq); 1548 } 1549 1550 /* 1551 * Disconnect the socket, and reset the callbacks 1552 */ 1553 static void svc_tcp_sock_detach(struct svc_xprt *xprt) 1554 { 1555 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1556 1557 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); 1558 1559 svc_sock_detach(xprt); 1560 1561 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { 1562 svc_tcp_clear_pages(svsk); 1563 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); 1564 } 1565 } 1566 1567 /* 1568 * Free the svc_sock's socket resources and the svc_sock itself. 1569 */ 1570 static void svc_sock_free(struct svc_xprt *xprt) 1571 { 1572 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); 1573 dprintk("svc: svc_sock_free(%p)\n", svsk); 1574 1575 if (svsk->sk_sock->file) 1576 sockfd_put(svsk->sk_sock); 1577 else 1578 sock_release(svsk->sk_sock); 1579 kfree(svsk); 1580 } 1581 1582 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1583 /* 1584 * Create a back channel svc_xprt which shares the fore channel socket. 1585 */ 1586 static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, 1587 int protocol, 1588 struct net *net, 1589 struct sockaddr *sin, int len, 1590 int flags) 1591 { 1592 struct svc_sock *svsk; 1593 struct svc_xprt *xprt; 1594 1595 if (protocol != IPPROTO_TCP) { 1596 printk(KERN_WARNING "svc: only TCP sockets" 1597 " supported on shared back channel\n"); 1598 return ERR_PTR(-EINVAL); 1599 } 1600 1601 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); 1602 if (!svsk) 1603 return ERR_PTR(-ENOMEM); 1604 1605 xprt = &svsk->sk_xprt; 1606 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); 1607 1608 serv->sv_bc_xprt = xprt; 1609 1610 return xprt; 1611 } 1612 1613 /* 1614 * Free a back channel svc_sock. 1615 */ 1616 static void svc_bc_sock_free(struct svc_xprt *xprt) 1617 { 1618 if (xprt) 1619 kfree(container_of(xprt, struct svc_sock, sk_xprt)); 1620 } 1621 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1622