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authorYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-03-04 00:50:52 -0500
committerYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-03-04 01:18:22 -0500
commit8be8af8fa4405652e6c0797db5465a4be8afb998 (patch)
tree3e560ec193fe41e244a9f977168e154b223fb986
parentcf80efc27d68d4e0717aa0b8647c4e161397ced7 (diff)
[IPV4] UDP: Move IPv4-specific bits to other file.
Move IPv4-specific UDP bits from net/ipv4/udp.c into (new) net/ipv4/udp_ipv4.c. Rename net/ipv4/udplite.c to net/ipv4/udplite_ipv4.c. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Diffstat
-rw-r--r--net/ipv4/Makefile4
-rw-r--r--net/ipv4/udp.c1086
-rw-r--r--net/ipv4/udp_ipv4.c1134
-rw-r--r--net/ipv4/udplite_ipv4.c (renamed from net/ipv4/udplite.c)0
4 files changed, 1136 insertions, 1088 deletions
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index e88cebdf3e30..d5226241d5ed 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -8,7 +8,7 @@ obj-y := route.o inetpeer.o protocol.o \
8 inet_timewait_sock.o inet_connection_sock.o \ 8 inet_timewait_sock.o inet_connection_sock.o \
9 tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \ 9 tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \
10 tcp_minisocks.o tcp_cong.o \ 10 tcp_minisocks.o tcp_cong.o \
11 datagram.o raw.o udp.o \ 11 datagram.o raw.o udp.o udp_ipv4.o \
12 arp.o icmp.o devinet.o af_inet.o igmp.o \ 12 arp.o icmp.o devinet.o af_inet.o igmp.o \
13 fib_frontend.o fib_semantics.o \ 13 fib_frontend.o fib_semantics.o \
14 inet_fragment.o 14 inet_fragment.o
@@ -49,7 +49,7 @@ obj-$(CONFIG_TCP_CONG_SCALABLE) += tcp_scalable.o
49obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o 49obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
50obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o 50obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
51obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o 51obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
52obj-$(CONFIG_IP_UDPLITE) += udplite.o 52obj-$(CONFIG_IP_UDPLITE) += udplite_ipv4.o
53obj-$(CONFIG_NETLABEL) += cipso_ipv4.o 53obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
54 54
55obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \ 55obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index acc353aa89eb..c53d7673b57d 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -246,553 +246,6 @@ int udp_get_port(struct sock *sk, unsigned short snum,
246 return __udp_lib_get_port(sk, snum, udp_hash, scmp); 246 return __udp_lib_get_port(sk, snum, udp_hash, scmp);
247} 247}
248 248
249int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
250{
251 struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
252
253 return ( !ipv6_only_sock(sk2) &&
254 (!inet1->rcv_saddr || !inet2->rcv_saddr ||
255 inet1->rcv_saddr == inet2->rcv_saddr ));
256}
257
258static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
259{
260 return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
261}
262
263/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
264 * harder than this. -DaveM
265 */
266static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
267 __be16 sport, __be32 daddr, __be16 dport,
268 int dif, struct hlist_head udptable[])
269{
270 struct sock *sk, *result = NULL;
271 struct hlist_node *node;
272 unsigned short hnum = ntohs(dport);
273 int badness = -1;
274
275 read_lock(&udp_hash_lock);
276 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
277 struct inet_sock *inet = inet_sk(sk);
278
279 if (sk->sk_net == net && sk->sk_hash == hnum &&
280 !ipv6_only_sock(sk)) {
281 int score = (sk->sk_family == PF_INET ? 1 : 0);
282 if (inet->rcv_saddr) {
283 if (inet->rcv_saddr != daddr)
284 continue;
285 score+=2;
286 }
287 if (inet->daddr) {
288 if (inet->daddr != saddr)
289 continue;
290 score+=2;
291 }
292 if (inet->dport) {
293 if (inet->dport != sport)
294 continue;
295 score+=2;
296 }
297 if (sk->sk_bound_dev_if) {
298 if (sk->sk_bound_dev_if != dif)
299 continue;
300 score+=2;
301 }
302 if (score == 9) {
303 result = sk;
304 break;
305 } else if (score > badness) {
306 result = sk;
307 badness = score;
308 }
309 }
310 }
311 if (result)
312 sock_hold(result);
313 read_unlock(&udp_hash_lock);
314 return result;
315}
316
317static inline struct sock *udp_v4_mcast_next(struct sock *sk,
318 __be16 loc_port, __be32 loc_addr,
319 __be16 rmt_port, __be32 rmt_addr,
320 int dif)
321{
322 struct hlist_node *node;
323 struct sock *s = sk;
324 unsigned short hnum = ntohs(loc_port);
325
326 sk_for_each_from(s, node) {
327 struct inet_sock *inet = inet_sk(s);
328
329 if (s->sk_hash != hnum ||
330 (inet->daddr && inet->daddr != rmt_addr) ||
331 (inet->dport != rmt_port && inet->dport) ||
332 (inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
333 ipv6_only_sock(s) ||
334 (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
335 continue;
336 if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
337 continue;
338 goto found;
339 }
340 s = NULL;
341found:
342 return s;
343}
344
345/*
346 * This routine is called by the ICMP module when it gets some
347 * sort of error condition. If err < 0 then the socket should
348 * be closed and the error returned to the user. If err > 0
349 * it's just the icmp type << 8 | icmp code.
350 * Header points to the ip header of the error packet. We move
351 * on past this. Then (as it used to claim before adjustment)
352 * header points to the first 8 bytes of the udp header. We need
353 * to find the appropriate port.
354 */
355
356void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
357{
358 struct inet_sock *inet;
359 struct iphdr *iph = (struct iphdr*)skb->data;
360 struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
361 const int type = icmp_hdr(skb)->type;
362 const int code = icmp_hdr(skb)->code;
363 struct sock *sk;
364 int harderr;
365 int err;
366
367 sk = __udp4_lib_lookup(skb->dev->nd_net, iph->daddr, uh->dest,
368 iph->saddr, uh->source, skb->dev->ifindex, udptable);
369 if (sk == NULL) {
370 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
371 return; /* No socket for error */
372 }
373
374 err = 0;
375 harderr = 0;
376 inet = inet_sk(sk);
377
378 switch (type) {
379 default:
380 case ICMP_TIME_EXCEEDED:
381 err = EHOSTUNREACH;
382 break;
383 case ICMP_SOURCE_QUENCH:
384 goto out;
385 case ICMP_PARAMETERPROB:
386 err = EPROTO;
387 harderr = 1;
388 break;
389 case ICMP_DEST_UNREACH:
390 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
391 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
392 err = EMSGSIZE;
393 harderr = 1;
394 break;
395 }
396 goto out;
397 }
398 err = EHOSTUNREACH;
399 if (code <= NR_ICMP_UNREACH) {
400 harderr = icmp_err_convert[code].fatal;
401 err = icmp_err_convert[code].errno;
402 }
403 break;
404 }
405
406 /*
407 * RFC1122: OK. Passes ICMP errors back to application, as per
408 * 4.1.3.3.
409 */
410 if (!inet->recverr) {
411 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
412 goto out;
413 } else {
414 ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
415 }
416 sk->sk_err = err;
417 sk->sk_error_report(sk);
418out:
419 sock_put(sk);
420}
421
422void udp_err(struct sk_buff *skb, u32 info)
423{
424 __udp4_lib_err(skb, info, udp_hash);
425}
426
427/*
428 * Throw away all pending data and cancel the corking. Socket is locked.
429 */
430static void udp_flush_pending_frames(struct sock *sk)
431{
432 struct udp_sock *up = udp_sk(sk);
433
434 if (up->pending) {
435 up->len = 0;
436 up->pending = 0;
437 ip_flush_pending_frames(sk);
438 }
439}
440
441/**
442 * udp4_hwcsum_outgoing - handle outgoing HW checksumming
443 * @sk: socket we are sending on
444 * @skb: sk_buff containing the filled-in UDP header
445 * (checksum field must be zeroed out)
446 */
447static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
448 __be32 src, __be32 dst, int len )
449{
450 unsigned int offset;
451 struct udphdr *uh = udp_hdr(skb);
452 __wsum csum = 0;
453
454 if (skb_queue_len(&sk->sk_write_queue) == 1) {
455 /*
456 * Only one fragment on the socket.
457 */
458 skb->csum_start = skb_transport_header(skb) - skb->head;
459 skb->csum_offset = offsetof(struct udphdr, check);
460 uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
461 } else {
462 /*
463 * HW-checksum won't work as there are two or more
464 * fragments on the socket so that all csums of sk_buffs
465 * should be together
466 */
467 offset = skb_transport_offset(skb);
468 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
469
470 skb->ip_summed = CHECKSUM_NONE;
471
472 skb_queue_walk(&sk->sk_write_queue, skb) {
473 csum = csum_add(csum, skb->csum);
474 }
475
476 uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
477 if (uh->check == 0)
478 uh->check = CSUM_MANGLED_0;
479 }
480}
481
482/*
483 * Push out all pending data as one UDP datagram. Socket is locked.
484 */
485static int udp_push_pending_frames(struct sock *sk)
486{
487 struct udp_sock *up = udp_sk(sk);
488 struct inet_sock *inet = inet_sk(sk);
489 struct flowi *fl = &inet->cork.fl;
490 struct sk_buff *skb;
491 struct udphdr *uh;
492 int err = 0;
493 int is_udplite = IS_UDPLITE(sk);
494 __wsum csum = 0;
495
496 /* Grab the skbuff where UDP header space exists. */
497 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
498 goto out;
499
500 /*
501 * Create a UDP header
502 */
503 uh = udp_hdr(skb);
504 uh->source = fl->fl_ip_sport;
505 uh->dest = fl->fl_ip_dport;
506 uh->len = htons(up->len);
507 uh->check = 0;
508
509 if (is_udplite) /* UDP-Lite */
510 csum = udplite_csum_outgoing(sk, skb);
511
512 else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */
513
514 skb->ip_summed = CHECKSUM_NONE;
515 goto send;
516
517 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
518
519 udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
520 goto send;
521
522 } else /* `normal' UDP */
523 csum = udp_csum_outgoing(sk, skb);
524
525 /* add protocol-dependent pseudo-header */
526 uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
527 sk->sk_protocol, csum );
528 if (uh->check == 0)
529 uh->check = CSUM_MANGLED_0;
530
531send:
532 err = ip_push_pending_frames(sk);
533out:
534 up->len = 0;
535 up->pending = 0;
536 if (!err)
537 UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
538 return err;
539}
540
541int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
542 size_t len)
543{
544 struct inet_sock *inet = inet_sk(sk);
545 struct udp_sock *up = udp_sk(sk);
546 int ulen = len;
547 struct ipcm_cookie ipc;
548 struct rtable *rt = NULL;
549 int free = 0;
550 int connected = 0;
551 __be32 daddr, faddr, saddr;
552 __be16 dport;
553 u8 tos;
554 int err, is_udplite = IS_UDPLITE(sk);
555 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
556 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
557
558 if (len > 0xFFFF)
559 return -EMSGSIZE;
560
561 /*
562 * Check the flags.
563 */
564
565 if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
566 return -EOPNOTSUPP;
567
568 ipc.opt = NULL;
569
570 if (up->pending) {
571 /*
572 * There are pending frames.
573 * The socket lock must be held while it's corked.
574 */
575 lock_sock(sk);
576 if (likely(up->pending)) {
577 if (unlikely(up->pending != AF_INET)) {
578 release_sock(sk);
579 return -EINVAL;
580 }
581 goto do_append_data;
582 }
583 release_sock(sk);
584 }
585 ulen += sizeof(struct udphdr);
586
587 /*
588 * Get and verify the address.
589 */
590 if (msg->msg_name) {
591 struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
592 if (msg->msg_namelen < sizeof(*usin))
593 return -EINVAL;
594 if (usin->sin_family != AF_INET) {
595 if (usin->sin_family != AF_UNSPEC)
596 return -EAFNOSUPPORT;
597 }
598
599 daddr = usin->sin_addr.s_addr;
600 dport = usin->sin_port;
601 if (dport == 0)
602 return -EINVAL;
603 } else {
604 if (sk->sk_state != TCP_ESTABLISHED)
605 return -EDESTADDRREQ;
606 daddr = inet->daddr;
607 dport = inet->dport;
608 /* Open fast path for connected socket.
609 Route will not be used, if at least one option is set.
610 */
611 connected = 1;
612 }
613 ipc.addr = inet->saddr;
614
615 ipc.oif = sk->sk_bound_dev_if;
616 if (msg->msg_controllen) {
617 err = ip_cmsg_send(msg, &ipc);
618 if (err)
619 return err;
620 if (ipc.opt)
621 free = 1;
622 connected = 0;
623 }
624 if (!ipc.opt)
625 ipc.opt = inet->opt;
626
627 saddr = ipc.addr;
628 ipc.addr = faddr = daddr;
629
630 if (ipc.opt && ipc.opt->srr) {
631 if (!daddr)
632 return -EINVAL;
633 faddr = ipc.opt->faddr;
634 connected = 0;
635 }
636 tos = RT_TOS(inet->tos);
637 if (sock_flag(sk, SOCK_LOCALROUTE) ||
638 (msg->msg_flags & MSG_DONTROUTE) ||
639 (ipc.opt && ipc.opt->is_strictroute)) {
640 tos |= RTO_ONLINK;
641 connected = 0;
642 }
643
644 if (ipv4_is_multicast(daddr)) {
645 if (!ipc.oif)
646 ipc.oif = inet->mc_index;
647 if (!saddr)
648 saddr = inet->mc_addr;
649 connected = 0;
650 }
651
652 if (connected)
653 rt = (struct rtable*)sk_dst_check(sk, 0);
654
655 if (rt == NULL) {
656 struct flowi fl = { .oif = ipc.oif,
657 .nl_u = { .ip4_u =
658 { .daddr = faddr,
659 .saddr = saddr,
660 .tos = tos } },
661 .proto = sk->sk_protocol,
662 .uli_u = { .ports =
663 { .sport = inet->sport,
664 .dport = dport } } };
665 security_sk_classify_flow(sk, &fl);
666 err = ip_route_output_flow(&init_net, &rt, &fl, sk, 1);
667 if (err) {
668 if (err == -ENETUNREACH)
669 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
670 goto out;
671 }
672
673 err = -EACCES;
674 if ((rt->rt_flags & RTCF_BROADCAST) &&
675 !sock_flag(sk, SOCK_BROADCAST))
676 goto out;
677 if (connected)
678 sk_dst_set(sk, dst_clone(&rt->u.dst));
679 }
680
681 if (msg->msg_flags&MSG_CONFIRM)
682 goto do_confirm;
683back_from_confirm:
684
685 saddr = rt->rt_src;
686 if (!ipc.addr)
687 daddr = ipc.addr = rt->rt_dst;
688
689 lock_sock(sk);
690 if (unlikely(up->pending)) {
691 /* The socket is already corked while preparing it. */
692 /* ... which is an evident application bug. --ANK */
693 release_sock(sk);
694
695 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
696 err = -EINVAL;
697 goto out;
698 }
699 /*
700 * Now cork the socket to pend data.
701 */
702 inet->cork.fl.fl4_dst = daddr;
703 inet->cork.fl.fl_ip_dport = dport;
704 inet->cork.fl.fl4_src = saddr;
705 inet->cork.fl.fl_ip_sport = inet->sport;
706 up->pending = AF_INET;
707
708do_append_data:
709 up->len += ulen;
710 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
711 err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
712 sizeof(struct udphdr), &ipc, rt,
713 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
714 if (err)
715 udp_flush_pending_frames(sk);
716 else if (!corkreq)
717 err = udp_push_pending_frames(sk);
718 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
719 up->pending = 0;
720 release_sock(sk);
721
722out:
723 ip_rt_put(rt);
724 if (free)
725 kfree(ipc.opt);
726 if (!err)
727 return len;
728 /*
729 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
730 * ENOBUFS might not be good (it's not tunable per se), but otherwise
731 * we don't have a good statistic (IpOutDiscards but it can be too many
732 * things). We could add another new stat but at least for now that
733 * seems like overkill.
734 */
735 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
736 UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
737 }
738 return err;
739
740do_confirm:
741 dst_confirm(&rt->u.dst);
742 if (!(msg->msg_flags&MSG_PROBE) || len)
743 goto back_from_confirm;
744 err = 0;
745 goto out;
746}
747
748int udp_sendpage(struct sock *sk, struct page *page, int offset,
749 size_t size, int flags)
750{
751 struct udp_sock *up = udp_sk(sk);
752 int ret;
753
754 if (!up->pending) {
755 struct msghdr msg = { .msg_flags = flags|MSG_MORE };
756
757 /* Call udp_sendmsg to specify destination address which
758 * sendpage interface can't pass.
759 * This will succeed only when the socket is connected.
760 */
761 ret = udp_sendmsg(NULL, sk, &msg, 0);
762 if (ret < 0)
763 return ret;
764 }
765
766 lock_sock(sk);
767
768 if (unlikely(!up->pending)) {
769 release_sock(sk);
770
771 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
772 return -EINVAL;
773 }
774
775 ret = ip_append_page(sk, page, offset, size, flags);
776 if (ret == -EOPNOTSUPP) {
777 release_sock(sk);
778 return sock_no_sendpage(sk->sk_socket, page, offset,
779 size, flags);
780 }
781 if (ret < 0) {
782 udp_flush_pending_frames(sk);
783 goto out;
784 }
785
786 up->len += size;
787 if (!(up->corkflag || (flags&MSG_MORE)))
788 ret = udp_push_pending_frames(sk);
789 if (!ret)
790 ret = size;
791out:
792 release_sock(sk);
793 return ret;
794}
795
796/* 249/*
797 * IOCTL requests applicable to the UDP protocol 250 * IOCTL requests applicable to the UDP protocol
798 */ 251 */
@@ -833,107 +286,6 @@ int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
833 return 0; 286 return 0;
834} 287}
835 288
836/*
837 * This should be easy, if there is something there we
838 * return it, otherwise we block.
839 */
840
841int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
842 size_t len, int noblock, int flags, int *addr_len)
843{
844 struct inet_sock *inet = inet_sk(sk);
845 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
846 struct sk_buff *skb;
847 unsigned int ulen, copied;
848 int peeked;
849 int err;
850 int is_udplite = IS_UDPLITE(sk);
851
852 /*
853 * Check any passed addresses
854 */
855 if (addr_len)
856 *addr_len=sizeof(*sin);
857
858 if (flags & MSG_ERRQUEUE)
859 return ip_recv_error(sk, msg, len);
860
861try_again:
862 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
863 &peeked, &err);
864 if (!skb)
865 goto out;
866
867 ulen = skb->len - sizeof(struct udphdr);
868 copied = len;
869 if (copied > ulen)
870 copied = ulen;
871 else if (copied < ulen)
872 msg->msg_flags |= MSG_TRUNC;
873
874 /*
875 * If checksum is needed at all, try to do it while copying the
876 * data. If the data is truncated, or if we only want a partial
877 * coverage checksum (UDP-Lite), do it before the copy.
878 */
879
880 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
881 if (udp_lib_checksum_complete(skb))
882 goto csum_copy_err;
883 }
884
885 if (skb_csum_unnecessary(skb))
886 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
887 msg->msg_iov, copied );
888 else {
889 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
890
891 if (err == -EINVAL)
892 goto csum_copy_err;
893 }
894
895 if (err)
896 goto out_free;
897
898 if (!peeked)
899 UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
900
901 sock_recv_timestamp(msg, sk, skb);
902
903 /* Copy the address. */
904 if (sin)
905 {
906 sin->sin_family = AF_INET;
907 sin->sin_port = udp_hdr(skb)->source;
908 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
909 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
910 }
911 if (inet->cmsg_flags)
912 ip_cmsg_recv(msg, skb);
913
914 err = copied;
915 if (flags & MSG_TRUNC)
916 err = ulen;
917
918out_free:
919 lock_sock(sk);
920 skb_free_datagram(sk, skb);
921 release_sock(sk);
922out:
923 return err;
924
925csum_copy_err:
926 lock_sock(sk);
927 if (!skb_kill_datagram(sk, skb, flags))
928 UDP_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
929 release_sock(sk);
930
931 if (noblock)
932 return -EAGAIN;
933 goto try_again;
934}
935
936
937int udp_disconnect(struct sock *sk, int flags) 289int udp_disconnect(struct sock *sk, int flags)
938{ 290{
939 struct inet_sock *inet = inet_sk(sk); 291 struct inet_sock *inet = inet_sk(sk);
@@ -956,319 +308,6 @@ int udp_disconnect(struct sock *sk, int flags)
956 return 0; 308 return 0;
957} 309}
958 310
959/* returns:
960 * -1: error
961 * 0: success
962 * >0: "udp encap" protocol resubmission
963 *
964 * Note that in the success and error cases, the skb is assumed to
965 * have either been requeued or freed.
966 */
967int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
968{
969 struct udp_sock *up = udp_sk(sk);
970 int rc;
971 int is_udplite = IS_UDPLITE(sk);
972
973 /*
974 * Charge it to the socket, dropping if the queue is full.
975 */
976 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
977 goto drop;
978 nf_reset(skb);
979
980 if (up->encap_type) {
981 /*
982 * This is an encapsulation socket so pass the skb to
983 * the socket's udp_encap_rcv() hook. Otherwise, just
984 * fall through and pass this up the UDP socket.
985 * up->encap_rcv() returns the following value:
986 * =0 if skb was successfully passed to the encap
987 * handler or was discarded by it.
988 * >0 if skb should be passed on to UDP.
989 * <0 if skb should be resubmitted as proto -N
990 */
991
992 /* if we're overly short, let UDP handle it */
993 if (skb->len > sizeof(struct udphdr) &&
994 up->encap_rcv != NULL) {
995 int ret;
996
997 ret = (*up->encap_rcv)(sk, skb);
998 if (ret <= 0) {
999 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS,
1000 is_udplite);
1001 return -ret;
1002 }
1003 }
1004
1005 /* FALLTHROUGH -- it's a UDP Packet */
1006 }
1007
1008 /*
1009 * UDP-Lite specific tests, ignored on UDP sockets
1010 */
1011 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
1012
1013 /*
1014 * MIB statistics other than incrementing the error count are
1015 * disabled for the following two types of errors: these depend
1016 * on the application settings, not on the functioning of the
1017 * protocol stack as such.
1018 *
1019 * RFC 3828 here recommends (sec 3.3): "There should also be a
1020 * way ... to ... at least let the receiving application block
1021 * delivery of packets with coverage values less than a value
1022 * provided by the application."
1023 */
1024 if (up->pcrlen == 0) { /* full coverage was set */
1025 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
1026 "%d while full coverage %d requested\n",
1027 UDP_SKB_CB(skb)->cscov, skb->len);
1028 goto drop;
1029 }
1030 /* The next case involves violating the min. coverage requested
1031 * by the receiver. This is subtle: if receiver wants x and x is
1032 * greater than the buffersize/MTU then receiver will complain
1033 * that it wants x while sender emits packets of smaller size y.
1034 * Therefore the above ...()->partial_cov statement is essential.
1035 */
1036 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
1037 LIMIT_NETDEBUG(KERN_WARNING
1038 "UDPLITE: coverage %d too small, need min %d\n",
1039 UDP_SKB_CB(skb)->cscov, up->pcrlen);
1040 goto drop;
1041 }
1042 }
1043
1044 if (sk->sk_filter) {
1045 if (udp_lib_checksum_complete(skb))
1046 goto drop;
1047 }
1048
1049 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
1050 /* Note that an ENOMEM error is charged twice */
1051 if (rc == -ENOMEM)
1052 UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
1053 goto drop;
1054 }
1055
1056 return 0;
1057
1058drop:
1059 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
1060 kfree_skb(skb);
1061 return -1;
1062}
1063
1064/*
1065 * Multicasts and broadcasts go to each listener.
1066 *
1067 * Note: called only from the BH handler context,
1068 * so we don't need to lock the hashes.
1069 */
1070static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
1071 struct udphdr *uh,
1072 __be32 saddr, __be32 daddr,
1073 struct hlist_head udptable[])
1074{
1075 struct sock *sk;
1076 int dif;
1077
1078 read_lock(&udp_hash_lock);
1079 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
1080 dif = skb->dev->ifindex;
1081 sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
1082 if (sk) {
1083 struct sock *sknext = NULL;
1084
1085 do {
1086 struct sk_buff *skb1 = skb;
1087
1088 sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
1089 uh->source, saddr, dif);
1090 if (sknext)
1091 skb1 = skb_clone(skb, GFP_ATOMIC);
1092
1093 if (skb1) {
1094 int ret = 0;
1095
1096 bh_lock_sock_nested(sk);
1097 if (!sock_owned_by_user(sk))
1098 ret = udp_queue_rcv_skb(sk, skb1);
1099 else
1100 sk_add_backlog(sk, skb1);
1101 bh_unlock_sock(sk);
1102
1103 if (ret > 0)
1104 /* we should probably re-process instead
1105 * of dropping packets here. */
1106 kfree_skb(skb1);
1107 }
1108 sk = sknext;
1109 } while (sknext);
1110 } else
1111 kfree_skb(skb);
1112 read_unlock(&udp_hash_lock);
1113 return 0;
1114}
1115
1116/* Initialize UDP checksum. If exited with zero value (success),
1117 * CHECKSUM_UNNECESSARY means, that no more checks are required.
1118 * Otherwise, csum completion requires chacksumming packet body,
1119 * including udp header and folding it to skb->csum.
1120 */
1121static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
1122 int proto)
1123{
1124 const struct iphdr *iph;
1125 int err;
1126
1127 UDP_SKB_CB(skb)->partial_cov = 0;
1128 UDP_SKB_CB(skb)->cscov = skb->len;
1129
1130 if (IS_PROTO_UDPLITE(proto)) {
1131 err = udplite_checksum_init(skb, uh);
1132 if (err)
1133 return err;
1134 }
1135
1136 iph = ip_hdr(skb);
1137 if (uh->check == 0) {
1138 skb->ip_summed = CHECKSUM_UNNECESSARY;
1139 } else if (skb->ip_summed == CHECKSUM_COMPLETE) {
1140 if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
1141 proto, skb->csum))
1142 skb->ip_summed = CHECKSUM_UNNECESSARY;
1143 }
1144 if (!skb_csum_unnecessary(skb))
1145 skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
1146 skb->len, proto, 0);
1147 /* Probably, we should checksum udp header (it should be in cache
1148 * in any case) and data in tiny packets (< rx copybreak).
1149 */
1150
1151 return 0;
1152}
1153
1154/*
1155 * All we need to do is get the socket, and then do a checksum.
1156 */
1157
1158int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
1159 int proto)
1160{
1161 struct sock *sk;
1162 struct udphdr *uh = udp_hdr(skb);
1163 unsigned short ulen;
1164 struct rtable *rt = (struct rtable*)skb->dst;
1165 __be32 saddr = ip_hdr(skb)->saddr;
1166 __be32 daddr = ip_hdr(skb)->daddr;
1167
1168 /*
1169 * Validate the packet.
1170 */
1171 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
1172 goto drop; /* No space for header. */
1173
1174 ulen = ntohs(uh->len);
1175 if (ulen > skb->len)
1176 goto short_packet;
1177
1178 if (IS_PROTO_UDPLITE(proto)) {
1179 /* UDP validates ulen. */
1180 if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
1181 goto short_packet;
1182 uh = udp_hdr(skb);
1183 }
1184
1185 if (udp4_csum_init(skb, uh, proto))
1186 goto csum_error;
1187
1188 if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
1189 return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
1190
1191 sk = __udp4_lib_lookup(skb->dev->nd_net, saddr, uh->source, daddr,
1192 uh->dest, inet_iif(skb), udptable);
1193
1194 if (sk != NULL) {
1195 int ret = 0;
1196 bh_lock_sock_nested(sk);
1197 if (!sock_owned_by_user(sk))
1198 ret = udp_queue_rcv_skb(sk, skb);
1199 else
1200 sk_add_backlog(sk, skb);
1201 bh_unlock_sock(sk);
1202 sock_put(sk);
1203
1204 /* a return value > 0 means to resubmit the input, but
1205 * it wants the return to be -protocol, or 0
1206 */
1207 if (ret > 0)
1208 return -ret;
1209 return 0;
1210 }
1211
1212 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
1213 goto drop;
1214 nf_reset(skb);
1215
1216 /* No socket. Drop packet silently, if checksum is wrong */
1217 if (udp_lib_checksum_complete(skb))
1218 goto csum_error;
1219
1220 UDP_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
1221 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
1222
1223 /*
1224 * Hmm. We got an UDP packet to a port to which we
1225 * don't wanna listen. Ignore it.
1226 */
1227 kfree_skb(skb);
1228 return 0;
1229
1230short_packet:
1231 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
1232 IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
1233 NIPQUAD(saddr),
1234 ntohs(uh->source),
1235 ulen,
1236 skb->len,
1237 NIPQUAD(daddr),
1238 ntohs(uh->dest));
1239 goto drop;
1240
1241csum_error:
1242 /*
1243 * RFC1122: OK. Discards the bad packet silently (as far as
1244 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
1245 */
1246 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
1247 IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
1248 NIPQUAD(saddr),
1249 ntohs(uh->source),
1250 NIPQUAD(daddr),
1251 ntohs(uh->dest),
1252 ulen);
1253drop:
1254 UDP_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
1255 kfree_skb(skb);
1256 return 0;
1257}
1258
1259int udp_rcv(struct sk_buff *skb)
1260{
1261 return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
1262}
1263
1264int udp_destroy_sock(struct sock *sk)
1265{
1266 lock_sock(sk);
1267 udp_flush_pending_frames(sk);
1268 release_sock(sk);
1269 return 0;
1270}
1271
1272/* 311/*
1273 * Socket option code for UDP 312 * Socket option code for UDP
1274 */ 313 */
@@ -1353,26 +392,6 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
1353 return err; 392 return err;
1354} 393}
1355 394
1356int udp_setsockopt(struct sock *sk, int level, int optname,
1357 char __user *optval, int optlen)
1358{
1359 if (IS_SOL_UDPFAMILY(level))
1360 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1361 udp_push_pending_frames);
1362 return ip_setsockopt(sk, level, optname, optval, optlen);
1363}
1364
1365#ifdef CONFIG_COMPAT
1366int compat_udp_setsockopt(struct sock *sk, int level, int optname,
1367 char __user *optval, int optlen)
1368{
1369 if (IS_SOL_UDPFAMILY(level))
1370 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1371 udp_push_pending_frames);
1372 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
1373}
1374#endif
1375
1376int udp_lib_getsockopt(struct sock *sk, int level, int optname, 395int udp_lib_getsockopt(struct sock *sk, int level, int optname,
1377 char __user *optval, int __user *optlen) 396 char __user *optval, int __user *optlen)
1378{ 397{
@@ -1417,23 +436,6 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname,
1417 return 0; 436 return 0;
1418} 437}
1419 438
1420int udp_getsockopt(struct sock *sk, int level, int optname,
1421 char __user *optval, int __user *optlen)
1422{
1423 if (IS_SOL_UDPFAMILY(level))
1424 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1425 return ip_getsockopt(sk, level, optname, optval, optlen);
1426}
1427
1428#ifdef CONFIG_COMPAT
1429int compat_udp_getsockopt(struct sock *sk, int level, int optname,
1430 char __user *optval, int __user *optlen)
1431{
1432 if (IS_SOL_UDPFAMILY(level))
1433 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1434 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
1435}
1436#endif
1437/** 439/**
1438 * udp_poll - wait for a UDP event. 440 * udp_poll - wait for a UDP event.
1439 * @file - file struct 441 * @file - file struct
@@ -1478,36 +480,6 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
1478 480
1479} 481}
1480 482
1481DEFINE_PROTO_INUSE(udp)
1482
1483struct proto udp_prot = {
1484 .name = "UDP",
1485 .owner = THIS_MODULE,
1486 .close = udp_lib_close,
1487 .connect = ip4_datagram_connect,
1488 .disconnect = udp_disconnect,
1489 .ioctl = udp_ioctl,
1490 .destroy = udp_destroy_sock,
1491 .setsockopt = udp_setsockopt,
1492 .getsockopt = udp_getsockopt,
1493 .sendmsg = udp_sendmsg,
1494 .recvmsg = udp_recvmsg,
1495 .sendpage = udp_sendpage,
1496 .backlog_rcv = udp_queue_rcv_skb,
1497 .hash = udp_lib_hash,
1498 .unhash = udp_lib_unhash,
1499 .get_port = udp_v4_get_port,
1500 .memory_allocated = &udp_memory_allocated,
1501 .sysctl_mem = sysctl_udp_mem,
1502 .sysctl_wmem = &sysctl_udp_wmem_min,
1503 .sysctl_rmem = &sysctl_udp_rmem_min,
1504 .obj_size = sizeof(struct udp_sock),
1505#ifdef CONFIG_COMPAT
1506 .compat_setsockopt = compat_udp_setsockopt,
1507 .compat_getsockopt = compat_udp_getsockopt,
1508#endif
1509 REF_PROTO_INUSE(udp)
1510};
1511 483
1512/* ------------------------------------------------------------------------ */ 484/* ------------------------------------------------------------------------ */
1513#ifdef CONFIG_PROC_FS 485#ifdef CONFIG_PROC_FS
@@ -1640,62 +612,6 @@ void udp_proc_unregister(struct udp_seq_afinfo *afinfo)
1640 proc_net_remove(&init_net, afinfo->name); 612 proc_net_remove(&init_net, afinfo->name);
1641 memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops)); 613 memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops));
1642} 614}
1643
1644/* ------------------------------------------------------------------------ */
1645static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
1646{
1647 struct inet_sock *inet = inet_sk(sp);
1648 __be32 dest = inet->daddr;
1649 __be32 src = inet->rcv_saddr;
1650 __u16 destp = ntohs(inet->dport);
1651 __u16 srcp = ntohs(inet->sport);
1652
1653 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
1654 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
1655 bucket, src, srcp, dest, destp, sp->sk_state,
1656 atomic_read(&sp->sk_wmem_alloc),
1657 atomic_read(&sp->sk_rmem_alloc),
1658 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
1659 atomic_read(&sp->sk_refcnt), sp);
1660}
1661
1662int udp4_seq_show(struct seq_file *seq, void *v)
1663{
1664 if (v == SEQ_START_TOKEN)
1665 seq_printf(seq, "%-127s\n",
1666 " sl local_address rem_address st tx_queue "
1667 "rx_queue tr tm->when retrnsmt uid timeout "
1668 "inode");
1669 else {
1670 char tmpbuf[129];
1671 struct udp_iter_state *state = seq->private;
1672
1673 udp4_format_sock(v, tmpbuf, state->bucket);
1674 seq_printf(seq, "%-127s\n", tmpbuf);
1675 }
1676 return 0;
1677}
1678
1679/* ------------------------------------------------------------------------ */
1680static struct file_operations udp4_seq_fops;
1681static struct udp_seq_afinfo udp4_seq_afinfo = {
1682 .owner = THIS_MODULE,
1683 .name = "udp",
1684 .family = AF_INET,
1685 .hashtable = udp_hash,
1686 .seq_show = udp4_seq_show,
1687 .seq_fops = &udp4_seq_fops,
1688};
1689
1690int __init udp4_proc_init(void)
1691{
1692 return udp_proc_register(&udp4_seq_afinfo);
1693}
1694
1695void udp4_proc_exit(void)
1696{
1697 udp_proc_unregister(&udp4_seq_afinfo);
1698}
1699#endif /* CONFIG_PROC_FS */ 615#endif /* CONFIG_PROC_FS */
1700 616
1701void __init udp_init(void) 617void __init udp_init(void)
@@ -1722,8 +638,6 @@ EXPORT_SYMBOL(udp_hash);
1722EXPORT_SYMBOL(udp_hash_lock); 638EXPORT_SYMBOL(udp_hash_lock);
1723EXPORT_SYMBOL(udp_ioctl); 639EXPORT_SYMBOL(udp_ioctl);
1724EXPORT_SYMBOL(udp_get_port); 640EXPORT_SYMBOL(udp_get_port);
1725EXPORT_SYMBOL(udp_prot);
1726EXPORT_SYMBOL(udp_sendmsg);
1727EXPORT_SYMBOL(udp_lib_getsockopt); 641EXPORT_SYMBOL(udp_lib_getsockopt);
1728EXPORT_SYMBOL(udp_lib_setsockopt); 642EXPORT_SYMBOL(udp_lib_setsockopt);
1729EXPORT_SYMBOL(udp_poll); 643EXPORT_SYMBOL(udp_poll);
diff --git a/net/ipv4/udp_ipv4.c b/net/ipv4/udp_ipv4.c
new file mode 100644
index 000000000000..40978de7fb51
--- /dev/null
+++ b/net/ipv4/udp_ipv4.c
@@ -0,0 +1,1134 @@
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * UDP for IPv4.
7 *
8 * For full credits, see net/ipv4/udp.c.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16#include <asm/system.h>
17#include <asm/uaccess.h>
18#include <asm/ioctls.h>
19#include <linux/bootmem.h>
20#include <linux/types.h>
21#include <linux/fcntl.h>
22#include <linux/module.h>
23#include <linux/socket.h>
24#include <linux/sockios.h>
25#include <linux/igmp.h>
26#include <linux/in.h>
27#include <linux/errno.h>
28#include <linux/timer.h>
29#include <linux/mm.h>
30#include <linux/inet.h>
31#include <linux/netdevice.h>
32#include <net/tcp_states.h>
33#include <linux/skbuff.h>
34#include <linux/proc_fs.h>
35#include <linux/seq_file.h>
36#include <net/net_namespace.h>
37#include <net/icmp.h>
38#include <net/route.h>
39#include <net/checksum.h>
40#include <net/xfrm.h>
41#include "udp_impl.h"
42
43int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
44{
45 struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
46
47 return ( !ipv6_only_sock(sk2) &&
48 (!inet1->rcv_saddr || !inet2->rcv_saddr ||
49 inet1->rcv_saddr == inet2->rcv_saddr ));
50}
51
52static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
53{
54 return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
55}
56
57/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
58 * harder than this. -DaveM
59 */
60static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
61 __be16 sport, __be32 daddr, __be16 dport,
62 int dif, struct hlist_head udptable[])
63{
64 struct sock *sk, *result = NULL;
65 struct hlist_node *node;
66 unsigned short hnum = ntohs(dport);
67 int badness = -1;
68
69 read_lock(&udp_hash_lock);
70 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
71 struct inet_sock *inet = inet_sk(sk);
72
73 if (sk->sk_net == net && sk->sk_hash == hnum &&
74 !ipv6_only_sock(sk)) {
75 int score = (sk->sk_family == PF_INET ? 1 : 0);
76 if (inet->rcv_saddr) {
77 if (inet->rcv_saddr != daddr)
78 continue;
79 score+=2;
80 }
81 if (inet->daddr) {
82 if (inet->daddr != saddr)
83 continue;
84 score+=2;
85 }
86 if (inet->dport) {
87 if (inet->dport != sport)
88 continue;
89 score+=2;
90 }
91 if (sk->sk_bound_dev_if) {
92 if (sk->sk_bound_dev_if != dif)
93 continue;
94 score+=2;
95 }
96 if (score == 9) {
97 result = sk;
98 break;
99 } else if (score > badness) {
100 result = sk;
101 badness = score;
102 }
103 }
104 }
105 if (result)
106 sock_hold(result);
107 read_unlock(&udp_hash_lock);
108 return result;
109}
110
111static inline struct sock *udp_v4_mcast_next(struct sock *sk,
112 __be16 loc_port, __be32 loc_addr,
113 __be16 rmt_port, __be32 rmt_addr,
114 int dif)
115{
116 struct hlist_node *node;
117 struct sock *s = sk;
118 unsigned short hnum = ntohs(loc_port);
119
120 sk_for_each_from(s, node) {
121 struct inet_sock *inet = inet_sk(s);
122
123 if (s->sk_hash != hnum ||
124 (inet->daddr && inet->daddr != rmt_addr) ||
125 (inet->dport != rmt_port && inet->dport) ||
126 (inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
127 ipv6_only_sock(s) ||
128 (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
129 continue;
130 if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
131 continue;
132 goto found;
133 }
134 s = NULL;
135found:
136 return s;
137}
138
139/*
140 * This routine is called by the ICMP module when it gets some
141 * sort of error condition. If err < 0 then the socket should
142 * be closed and the error returned to the user. If err > 0
143 * it's just the icmp type << 8 | icmp code.
144 * Header points to the ip header of the error packet. We move
145 * on past this. Then (as it used to claim before adjustment)
146 * header points to the first 8 bytes of the udp header. We need
147 * to find the appropriate port.
148 */
149
150void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
151{
152 struct inet_sock *inet;
153 struct iphdr *iph = (struct iphdr*)skb->data;
154 struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
155 const int type = icmp_hdr(skb)->type;
156 const int code = icmp_hdr(skb)->code;
157 struct sock *sk;
158 int harderr;
159 int err;
160
161 sk = __udp4_lib_lookup(skb->dev->nd_net, iph->daddr, uh->dest,
162 iph->saddr, uh->source, skb->dev->ifindex, udptable);
163 if (sk == NULL) {
164 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
165 return; /* No socket for error */
166 }
167
168 err = 0;
169 harderr = 0;
170 inet = inet_sk(sk);
171
172 switch (type) {
173 default:
174 case ICMP_TIME_EXCEEDED:
175 err = EHOSTUNREACH;
176 break;
177 case ICMP_SOURCE_QUENCH:
178 goto out;
179 case ICMP_PARAMETERPROB:
180 err = EPROTO;
181 harderr = 1;
182 break;
183 case ICMP_DEST_UNREACH:
184 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
185 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
186 err = EMSGSIZE;
187 harderr = 1;
188 break;
189 }
190 goto out;
191 }
192 err = EHOSTUNREACH;
193 if (code <= NR_ICMP_UNREACH) {
194 harderr = icmp_err_convert[code].fatal;
195 err = icmp_err_convert[code].errno;
196 }
197 break;
198 }
199
200 /*
201 * RFC1122: OK. Passes ICMP errors back to application, as per
202 * 4.1.3.3.
203 */
204 if (!inet->recverr) {
205 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
206 goto out;
207 } else {
208 ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
209 }
210 sk->sk_err = err;
211 sk->sk_error_report(sk);
212out:
213 sock_put(sk);
214}
215
216void udp_err(struct sk_buff *skb, u32 info)
217{
218 __udp4_lib_err(skb, info, udp_hash);
219}
220
221/*
222 * Throw away all pending data and cancel the corking. Socket is locked.
223 */
224static void udp_flush_pending_frames(struct sock *sk)
225{
226 struct udp_sock *up = udp_sk(sk);
227
228 if (up->pending) {
229 up->len = 0;
230 up->pending = 0;
231 ip_flush_pending_frames(sk);
232 }
233}
234
235/**
236 * udp4_hwcsum_outgoing - handle outgoing HW checksumming
237 * @sk: socket we are sending on
238 * @skb: sk_buff containing the filled-in UDP header
239 * (checksum field must be zeroed out)
240 */
241static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
242 __be32 src, __be32 dst, int len )
243{
244 unsigned int offset;
245 struct udphdr *uh = udp_hdr(skb);
246 __wsum csum = 0;
247
248 if (skb_queue_len(&sk->sk_write_queue) == 1) {
249 /*
250 * Only one fragment on the socket.
251 */
252 skb->csum_start = skb_transport_header(skb) - skb->head;
253 skb->csum_offset = offsetof(struct udphdr, check);
254 uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
255 } else {
256 /*
257 * HW-checksum won't work as there are two or more
258 * fragments on the socket so that all csums of sk_buffs
259 * should be together
260 */
261 offset = skb_transport_offset(skb);
262 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
263
264 skb->ip_summed = CHECKSUM_NONE;
265
266 skb_queue_walk(&sk->sk_write_queue, skb) {
267 csum = csum_add(csum, skb->csum);
268 }
269
270 uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
271 if (uh->check == 0)
272 uh->check = CSUM_MANGLED_0;
273 }
274}
275
276/*
277 * Push out all pending data as one UDP datagram. Socket is locked.
278 */
279static int udp_push_pending_frames(struct sock *sk)
280{
281 struct udp_sock *up = udp_sk(sk);
282 struct inet_sock *inet = inet_sk(sk);
283 struct flowi *fl = &inet->cork.fl;
284 struct sk_buff *skb;
285 struct udphdr *uh;
286 int err = 0;
287 int is_udplite = IS_UDPLITE(sk);
288 __wsum csum = 0;
289
290 /* Grab the skbuff where UDP header space exists. */
291 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
292 goto out;
293
294 /*
295 * Create a UDP header
296 */
297 uh = udp_hdr(skb);
298 uh->source = fl->fl_ip_sport;
299 uh->dest = fl->fl_ip_dport;
300 uh->len = htons(up->len);
301 uh->check = 0;
302
303 if (is_udplite) /* UDP-Lite */
304 csum = udplite_csum_outgoing(sk, skb);
305
306 else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */
307
308 skb->ip_summed = CHECKSUM_NONE;
309 goto send;
310
311 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
312
313 udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
314 goto send;
315
316 } else /* `normal' UDP */
317 csum = udp_csum_outgoing(sk, skb);
318
319 /* add protocol-dependent pseudo-header */
320 uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
321 sk->sk_protocol, csum );
322 if (uh->check == 0)
323 uh->check = CSUM_MANGLED_0;
324
325send:
326 err = ip_push_pending_frames(sk);
327out:
328 up->len = 0;
329 up->pending = 0;
330 if (!err)
331 UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
332 return err;
333}
334
335int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
336 size_t len)
337{
338 struct inet_sock *inet = inet_sk(sk);
339 struct udp_sock *up = udp_sk(sk);
340 int ulen = len;
341 struct ipcm_cookie ipc;
342 struct rtable *rt = NULL;
343 int free = 0;
344 int connected = 0;
345 __be32 daddr, faddr, saddr;
346 __be16 dport;
347 u8 tos;
348 int err, is_udplite = IS_UDPLITE(sk);
349 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
350 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
351
352 if (len > 0xFFFF)
353 return -EMSGSIZE;
354
355 /*
356 * Check the flags.
357 */
358
359 if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
360 return -EOPNOTSUPP;
361
362 ipc.opt = NULL;
363
364 if (up->pending) {
365 /*
366 * There are pending frames.
367 * The socket lock must be held while it's corked.
368 */
369 lock_sock(sk);
370 if (likely(up->pending)) {
371 if (unlikely(up->pending != AF_INET)) {
372 release_sock(sk);
373 return -EINVAL;
374 }
375 goto do_append_data;
376 }
377 release_sock(sk);
378 }
379 ulen += sizeof(struct udphdr);
380
381 /*
382 * Get and verify the address.
383 */
384 if (msg->msg_name) {
385 struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
386 if (msg->msg_namelen < sizeof(*usin))
387 return -EINVAL;
388 if (usin->sin_family != AF_INET) {
389 if (usin->sin_family != AF_UNSPEC)
390 return -EAFNOSUPPORT;
391 }
392
393 daddr = usin->sin_addr.s_addr;
394 dport = usin->sin_port;
395 if (dport == 0)
396 return -EINVAL;
397 } else {
398 if (sk->sk_state != TCP_ESTABLISHED)
399 return -EDESTADDRREQ;
400 daddr = inet->daddr;
401 dport = inet->dport;
402 /* Open fast path for connected socket.
403 Route will not be used, if at least one option is set.
404 */
405 connected = 1;
406 }
407 ipc.addr = inet->saddr;
408
409 ipc.oif = sk->sk_bound_dev_if;
410 if (msg->msg_controllen) {
411 err = ip_cmsg_send(msg, &ipc);
412 if (err)
413 return err;
414 if (ipc.opt)
415 free = 1;
416 connected = 0;
417 }
418 if (!ipc.opt)
419 ipc.opt = inet->opt;
420
421 saddr = ipc.addr;
422 ipc.addr = faddr = daddr;
423
424 if (ipc.opt && ipc.opt->srr) {
425 if (!daddr)
426 return -EINVAL;
427 faddr = ipc.opt->faddr;
428 connected = 0;
429 }
430 tos = RT_TOS(inet->tos);
431 if (sock_flag(sk, SOCK_LOCALROUTE) ||
432 (msg->msg_flags & MSG_DONTROUTE) ||
433 (ipc.opt && ipc.opt->is_strictroute)) {
434 tos |= RTO_ONLINK;
435 connected = 0;
436 }
437
438 if (ipv4_is_multicast(daddr)) {
439 if (!ipc.oif)
440 ipc.oif = inet->mc_index;
441 if (!saddr)
442 saddr = inet->mc_addr;
443 connected = 0;
444 }
445
446 if (connected)
447 rt = (struct rtable*)sk_dst_check(sk, 0);
448
449 if (rt == NULL) {
450 struct flowi fl = { .oif = ipc.oif,
451 .nl_u = { .ip4_u =
452 { .daddr = faddr,
453 .saddr = saddr,
454 .tos = tos } },
455 .proto = sk->sk_protocol,
456 .uli_u = { .ports =
457 { .sport = inet->sport,
458 .dport = dport } } };
459 security_sk_classify_flow(sk, &fl);
460 err = ip_route_output_flow(&init_net, &rt, &fl, sk, 1);
461 if (err) {
462 if (err == -ENETUNREACH)
463 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
464 goto out;
465 }
466
467 err = -EACCES;
468 if ((rt->rt_flags & RTCF_BROADCAST) &&
469 !sock_flag(sk, SOCK_BROADCAST))
470 goto out;
471 if (connected)
472 sk_dst_set(sk, dst_clone(&rt->u.dst));
473 }
474
475 if (msg->msg_flags&MSG_CONFIRM)
476 goto do_confirm;
477back_from_confirm:
478
479 saddr = rt->rt_src;
480 if (!ipc.addr)
481 daddr = ipc.addr = rt->rt_dst;
482
483 lock_sock(sk);
484 if (unlikely(up->pending)) {
485 /* The socket is already corked while preparing it. */
486 /* ... which is an evident application bug. --ANK */
487 release_sock(sk);
488
489 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
490 err = -EINVAL;
491 goto out;
492 }
493 /*
494 * Now cork the socket to pend data.
495 */
496 inet->cork.fl.fl4_dst = daddr;
497 inet->cork.fl.fl_ip_dport = dport;
498 inet->cork.fl.fl4_src = saddr;
499 inet->cork.fl.fl_ip_sport = inet->sport;
500 up->pending = AF_INET;
501
502do_append_data:
503 up->len += ulen;
504 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
505 err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
506 sizeof(struct udphdr), &ipc, rt,
507 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
508 if (err)
509 udp_flush_pending_frames(sk);
510 else if (!corkreq)
511 err = udp_push_pending_frames(sk);
512 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
513 up->pending = 0;
514 release_sock(sk);
515
516out:
517 ip_rt_put(rt);
518 if (free)
519 kfree(ipc.opt);
520 if (!err)
521 return len;
522 /*
523 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
524 * ENOBUFS might not be good (it's not tunable per se), but otherwise
525 * we don't have a good statistic (IpOutDiscards but it can be too many
526 * things). We could add another new stat but at least for now that
527 * seems like overkill.
528 */
529 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
530 UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
531 }
532 return err;
533
534do_confirm:
535 dst_confirm(&rt->u.dst);
536 if (!(msg->msg_flags&MSG_PROBE) || len)
537 goto back_from_confirm;
538 err = 0;
539 goto out;
540}
541
542int udp_sendpage(struct sock *sk, struct page *page, int offset,
543 size_t size, int flags)
544{
545 struct udp_sock *up = udp_sk(sk);
546 int ret;
547
548 if (!up->pending) {
549 struct msghdr msg = { .msg_flags = flags|MSG_MORE };
550
551 /* Call udp_sendmsg to specify destination address which
552 * sendpage interface can't pass.
553 * This will succeed only when the socket is connected.
554 */
555 ret = udp_sendmsg(NULL, sk, &msg, 0);
556 if (ret < 0)
557 return ret;
558 }
559
560 lock_sock(sk);
561
562 if (unlikely(!up->pending)) {
563 release_sock(sk);
564
565 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
566 return -EINVAL;
567 }
568
569 ret = ip_append_page(sk, page, offset, size, flags);
570 if (ret == -EOPNOTSUPP) {
571 release_sock(sk);
572 return sock_no_sendpage(sk->sk_socket, page, offset,
573 size, flags);
574 }
575 if (ret < 0) {
576 udp_flush_pending_frames(sk);
577 goto out;
578 }
579
580 up->len += size;
581 if (!(up->corkflag || (flags&MSG_MORE)))
582 ret = udp_push_pending_frames(sk);
583 if (!ret)
584 ret = size;
585out:
586 release_sock(sk);
587 return ret;
588}
589
590/*
591 * This should be easy, if there is something there we
592 * return it, otherwise we block.
593 */
594
595int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
596 size_t len, int noblock, int flags, int *addr_len)
597{
598 struct inet_sock *inet = inet_sk(sk);
599 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
600 struct sk_buff *skb;
601 unsigned int ulen, copied;
602 int peeked;
603 int err;
604 int is_udplite = IS_UDPLITE(sk);
605
606 /*
607 * Check any passed addresses
608 */
609 if (addr_len)
610 *addr_len=sizeof(*sin);
611
612 if (flags & MSG_ERRQUEUE)
613 return ip_recv_error(sk, msg, len);
614
615try_again:
616 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
617 &peeked, &err);
618 if (!skb)
619 goto out;
620
621 ulen = skb->len - sizeof(struct udphdr);
622 copied = len;
623 if (copied > ulen)
624 copied = ulen;
625 else if (copied < ulen)
626 msg->msg_flags |= MSG_TRUNC;
627
628 /*
629 * If checksum is needed at all, try to do it while copying the
630 * data. If the data is truncated, or if we only want a partial
631 * coverage checksum (UDP-Lite), do it before the copy.
632 */
633
634 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
635 if (udp_lib_checksum_complete(skb))
636 goto csum_copy_err;
637 }
638
639 if (skb_csum_unnecessary(skb))
640 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
641 msg->msg_iov, copied );
642 else {
643 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
644
645 if (err == -EINVAL)
646 goto csum_copy_err;
647 }
648
649 if (err)
650 goto out_free;
651
652 if (!peeked)
653 UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
654
655 sock_recv_timestamp(msg, sk, skb);
656
657 /* Copy the address. */
658 if (sin)
659 {
660 sin->sin_family = AF_INET;
661 sin->sin_port = udp_hdr(skb)->source;
662 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
663 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
664 }
665 if (inet->cmsg_flags)
666 ip_cmsg_recv(msg, skb);
667
668 err = copied;
669 if (flags & MSG_TRUNC)
670 err = ulen;
671
672out_free:
673 lock_sock(sk);
674 skb_free_datagram(sk, skb);
675 release_sock(sk);
676out:
677 return err;
678
679csum_copy_err:
680 lock_sock(sk);
681 if (!skb_kill_datagram(sk, skb, flags))
682 UDP_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
683 release_sock(sk);
684
685 if (noblock)
686 return -EAGAIN;
687 goto try_again;
688}
689
690
691/* returns:
692 * -1: error
693 * 0: success
694 * >0: "udp encap" protocol resubmission
695 *
696 * Note that in the success and error cases, the skb is assumed to
697 * have either been requeued or freed.
698 */
699int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
700{
701 struct udp_sock *up = udp_sk(sk);
702 int rc;
703 int is_udplite = IS_UDPLITE(sk);
704
705 /*
706 * Charge it to the socket, dropping if the queue is full.
707 */
708 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
709 goto drop;
710 nf_reset(skb);
711
712 if (up->encap_type) {
713 /*
714 * This is an encapsulation socket so pass the skb to
715 * the socket's udp_encap_rcv() hook. Otherwise, just
716 * fall through and pass this up the UDP socket.
717 * up->encap_rcv() returns the following value:
718 * =0 if skb was successfully passed to the encap
719 * handler or was discarded by it.
720 * >0 if skb should be passed on to UDP.
721 * <0 if skb should be resubmitted as proto -N
722 */
723
724 /* if we're overly short, let UDP handle it */
725 if (skb->len > sizeof(struct udphdr) &&
726 up->encap_rcv != NULL) {
727 int ret;
728
729 ret = (*up->encap_rcv)(sk, skb);
730 if (ret <= 0) {
731 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS,
732 is_udplite);
733 return -ret;
734 }
735 }
736
737 /* FALLTHROUGH -- it's a UDP Packet */
738 }
739
740 /*
741 * UDP-Lite specific tests, ignored on UDP sockets
742 */
743 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
744
745 /*
746 * MIB statistics other than incrementing the error count are
747 * disabled for the following two types of errors: these depend
748 * on the application settings, not on the functioning of the
749 * protocol stack as such.
750 *
751 * RFC 3828 here recommends (sec 3.3): "There should also be a
752 * way ... to ... at least let the receiving application block
753 * delivery of packets with coverage values less than a value
754 * provided by the application."
755 */
756 if (up->pcrlen == 0) { /* full coverage was set */
757 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
758 "%d while full coverage %d requested\n",
759 UDP_SKB_CB(skb)->cscov, skb->len);
760 goto drop;
761 }
762 /* The next case involves violating the min. coverage requested
763 * by the receiver. This is subtle: if receiver wants x and x is
764 * greater than the buffersize/MTU then receiver will complain
765 * that it wants x while sender emits packets of smaller size y.
766 * Therefore the above ...()->partial_cov statement is essential.
767 */
768 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
769 LIMIT_NETDEBUG(KERN_WARNING
770 "UDPLITE: coverage %d too small, need min %d\n",
771 UDP_SKB_CB(skb)->cscov, up->pcrlen);
772 goto drop;
773 }
774 }
775
776 if (sk->sk_filter) {
777 if (udp_lib_checksum_complete(skb))
778 goto drop;
779 }
780
781 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
782 /* Note that an ENOMEM error is charged twice */
783 if (rc == -ENOMEM)
784 UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
785 goto drop;
786 }
787
788 return 0;
789
790drop:
791 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
792 kfree_skb(skb);
793 return -1;
794}
795
796/*
797 * Multicasts and broadcasts go to each listener.
798 *
799 * Note: called only from the BH handler context,
800 * so we don't need to lock the hashes.
801 */
802static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
803 struct udphdr *uh,
804 __be32 saddr, __be32 daddr,
805 struct hlist_head udptable[])
806{
807 struct sock *sk;
808 int dif;
809
810 read_lock(&udp_hash_lock);
811 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
812 dif = skb->dev->ifindex;
813 sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
814 if (sk) {
815 struct sock *sknext = NULL;
816
817 do {
818 struct sk_buff *skb1 = skb;
819
820 sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
821 uh->source, saddr, dif);
822 if (sknext)
823 skb1 = skb_clone(skb, GFP_ATOMIC);
824
825 if (skb1) {
826 int ret = 0;
827
828 bh_lock_sock_nested(sk);
829 if (!sock_owned_by_user(sk))
830 ret = udp_queue_rcv_skb(sk, skb1);
831 else
832 sk_add_backlog(sk, skb1);
833 bh_unlock_sock(sk);
834
835 if (ret > 0)
836 /* we should probably re-process instead
837 * of dropping packets here. */
838 kfree_skb(skb1);
839 }
840 sk = sknext;
841 } while (sknext);
842 } else
843 kfree_skb(skb);
844 read_unlock(&udp_hash_lock);
845 return 0;
846}
847
848/* Initialize UDP checksum. If exited with zero value (success),
849 * CHECKSUM_UNNECESSARY means, that no more checks are required.
850 * Otherwise, csum completion requires chacksumming packet body,
851 * including udp header and folding it to skb->csum.
852 */
853static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
854 int proto)
855{
856 const struct iphdr *iph;
857 int err;
858
859 UDP_SKB_CB(skb)->partial_cov = 0;
860 UDP_SKB_CB(skb)->cscov = skb->len;
861
862 if (IS_PROTO_UDPLITE(proto)) {
863 err = udplite_checksum_init(skb, uh);
864 if (err)
865 return err;
866 }
867
868 iph = ip_hdr(skb);
869 if (uh->check == 0) {
870 skb->ip_summed = CHECKSUM_UNNECESSARY;
871 } else if (skb->ip_summed == CHECKSUM_COMPLETE) {
872 if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
873 proto, skb->csum))
874 skb->ip_summed = CHECKSUM_UNNECESSARY;
875 }
876 if (!skb_csum_unnecessary(skb))
877 skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
878 skb->len, proto, 0);
879 /* Probably, we should checksum udp header (it should be in cache
880 * in any case) and data in tiny packets (< rx copybreak).
881 */
882
883 return 0;
884}
885
886/*
887 * All we need to do is get the socket, and then do a checksum.
888 */
889
890int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
891 int proto)
892{
893 struct sock *sk;
894 struct udphdr *uh = udp_hdr(skb);
895 unsigned short ulen;
896 struct rtable *rt = (struct rtable*)skb->dst;
897 __be32 saddr = ip_hdr(skb)->saddr;
898 __be32 daddr = ip_hdr(skb)->daddr;
899
900 /*
901 * Validate the packet.
902 */
903 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
904 goto drop; /* No space for header. */
905
906 ulen = ntohs(uh->len);
907 if (ulen > skb->len)
908 goto short_packet;
909
910 if (IS_PROTO_UDPLITE(proto)) {
911 /* UDP validates ulen. */
912 if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
913 goto short_packet;
914 uh = udp_hdr(skb);
915 }
916
917 if (udp4_csum_init(skb, uh, proto))
918 goto csum_error;
919
920 if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
921 return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
922
923 sk = __udp4_lib_lookup(skb->dev->nd_net, saddr, uh->source, daddr,
924 uh->dest, inet_iif(skb), udptable);
925
926 if (sk != NULL) {
927 int ret = 0;
928 bh_lock_sock_nested(sk);
929 if (!sock_owned_by_user(sk))
930 ret = udp_queue_rcv_skb(sk, skb);
931 else
932 sk_add_backlog(sk, skb);
933 bh_unlock_sock(sk);
934 sock_put(sk);
935
936 /* a return value > 0 means to resubmit the input, but
937 * it wants the return to be -protocol, or 0
938 */
939 if (ret > 0)
940 return -ret;
941 return 0;
942 }
943
944 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
945 goto drop;
946 nf_reset(skb);
947
948 /* No socket. Drop packet silently, if checksum is wrong */
949 if (udp_lib_checksum_complete(skb))
950 goto csum_error;
951
952 UDP_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
953 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
954
955 /*
956 * Hmm. We got an UDP packet to a port to which we
957 * don't wanna listen. Ignore it.
958 */
959 kfree_skb(skb);
960 return 0;
961
962short_packet:
963 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
964 IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
965 NIPQUAD(saddr),
966 ntohs(uh->source),
967 ulen,
968 skb->len,
969 NIPQUAD(daddr),
970 ntohs(uh->dest));
971 goto drop;
972
973csum_error:
974 /*
975 * RFC1122: OK. Discards the bad packet silently (as far as
976 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
977 */
978 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
979 IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
980 NIPQUAD(saddr),
981 ntohs(uh->source),
982 NIPQUAD(daddr),
983 ntohs(uh->dest),
984 ulen);
985drop:
986 UDP_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
987 kfree_skb(skb);
988 return 0;
989}
990
991int udp_rcv(struct sk_buff *skb)
992{
993 return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
994}
995
996int udp_destroy_sock(struct sock *sk)
997{
998 lock_sock(sk);
999 udp_flush_pending_frames(sk);
1000 release_sock(sk);
1001 return 0;
1002}
1003
1004int udp_setsockopt(struct sock *sk, int level, int optname,
1005 char __user *optval, int optlen)
1006{
1007 if (IS_SOL_UDPFAMILY(level))
1008 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1009 udp_push_pending_frames);
1010 return ip_setsockopt(sk, level, optname, optval, optlen);
1011}
1012
1013#ifdef CONFIG_COMPAT
1014int compat_udp_setsockopt(struct sock *sk, int level, int optname,
1015 char __user *optval, int optlen)
1016{
1017 if (IS_SOL_UDPFAMILY(level))
1018 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1019 udp_push_pending_frames);
1020 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
1021}
1022#endif
1023
1024int udp_getsockopt(struct sock *sk, int level, int optname,
1025 char __user *optval, int __user *optlen)
1026{
1027 if (IS_SOL_UDPFAMILY(level))
1028 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1029 return ip_getsockopt(sk, level, optname, optval, optlen);
1030}
1031
1032#ifdef CONFIG_COMPAT
1033int compat_udp_getsockopt(struct sock *sk, int level, int optname,
1034 char __user *optval, int __user *optlen)
1035{
1036 if (IS_SOL_UDPFAMILY(level))
1037 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1038 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
1039}
1040#endif
1041
1042/* ------------------------------------------------------------------------ */
1043DEFINE_PROTO_INUSE(udp)
1044
1045struct proto udp_prot = {
1046 .name = "UDP",
1047 .owner = THIS_MODULE,
1048 .close = udp_lib_close,
1049 .connect = ip4_datagram_connect,
1050 .disconnect = udp_disconnect,
1051 .ioctl = udp_ioctl,
1052 .destroy = udp_destroy_sock,
1053 .setsockopt = udp_setsockopt,
1054 .getsockopt = udp_getsockopt,
1055 .sendmsg = udp_sendmsg,
1056 .recvmsg = udp_recvmsg,
1057 .sendpage = udp_sendpage,
1058 .backlog_rcv = udp_queue_rcv_skb,
1059 .hash = udp_lib_hash,
1060 .unhash = udp_lib_unhash,
1061 .get_port = udp_v4_get_port,
1062 .memory_allocated = &udp_memory_allocated,
1063 .sysctl_mem = sysctl_udp_mem,
1064 .sysctl_wmem = &sysctl_udp_wmem_min,
1065 .sysctl_rmem = &sysctl_udp_rmem_min,
1066 .obj_size = sizeof(struct udp_sock),
1067#ifdef CONFIG_COMPAT
1068 .compat_setsockopt = compat_udp_setsockopt,
1069 .compat_getsockopt = compat_udp_getsockopt,
1070#endif
1071 REF_PROTO_INUSE(udp)
1072};
1073
1074/* ------------------------------------------------------------------------ */
1075static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
1076{
1077 struct inet_sock *inet = inet_sk(sp);
1078 __be32 dest = inet->daddr;
1079 __be32 src = inet->rcv_saddr;
1080 __u16 destp = ntohs(inet->dport);
1081 __u16 srcp = ntohs(inet->sport);
1082
1083 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
1084 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
1085 bucket, src, srcp, dest, destp, sp->sk_state,
1086 atomic_read(&sp->sk_wmem_alloc),
1087 atomic_read(&sp->sk_rmem_alloc),
1088 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
1089 atomic_read(&sp->sk_refcnt), sp);
1090}
1091
1092int udp4_seq_show(struct seq_file *seq, void *v)
1093{
1094 if (v == SEQ_START_TOKEN)
1095 seq_printf(seq, "%-127s\n",
1096 " sl local_address rem_address st tx_queue "
1097 "rx_queue tr tm->when retrnsmt uid timeout "
1098 "inode");
1099 else {
1100 char tmpbuf[129];
1101 struct udp_iter_state *state = seq->private;
1102
1103 udp4_format_sock(v, tmpbuf, state->bucket);
1104 seq_printf(seq, "%-127s\n", tmpbuf);
1105 }
1106 return 0;
1107}
1108
1109/* ------------------------------------------------------------------------ */
1110#ifdef CONFIG_PROC_FS
1111static struct file_operations udp4_seq_fops;
1112static struct udp_seq_afinfo udp4_seq_afinfo = {
1113 .owner = THIS_MODULE,
1114 .name = "udp",
1115 .family = AF_INET,
1116 .hashtable = udp_hash,
1117 .seq_show = udp4_seq_show,
1118 .seq_fops = &udp4_seq_fops,
1119};
1120
1121int __init udp4_proc_init(void)
1122{
1123 return udp_proc_register(&udp4_seq_afinfo);
1124}
1125
1126void udp4_proc_exit(void)
1127{
1128 udp_proc_unregister(&udp4_seq_afinfo);
1129}
1130#endif /* CONFIG_PROC_FS */
1131
1132EXPORT_SYMBOL(udp_prot);
1133EXPORT_SYMBOL(udp_sendmsg);
1134
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite_ipv4.c
index 001b881ca36f..001b881ca36f 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite_ipv4.c
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-24 16:12:54 -0500