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path: root/net/ipv4/udp_ipv4.c
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Diffstat (limited to 'net/ipv4/udp_ipv4.c')
-rw-r--r--net/ipv4/udp_ipv4.c1134
1 files changed, 0 insertions, 1134 deletions
diff --git a/net/ipv4/udp_ipv4.c b/net/ipv4/udp_ipv4.c
deleted file mode 100644
index fd14c2c50ed4..000000000000
--- a/net/ipv4/udp_ipv4.c
+++ /dev/null
@@ -1,1134 +0,0 @@
-/*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * UDP for IPv4.
- *
- * For full credits, see net/ipv4/udp.c.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/ioctls.h>
-#include <linux/bootmem.h>
-#include <linux/types.h>
-#include <linux/fcntl.h>
-#include <linux/module.h>
-#include <linux/socket.h>
-#include <linux/sockios.h>
-#include <linux/igmp.h>
-#include <linux/in.h>
-#include <linux/errno.h>
-#include <linux/timer.h>
-#include <linux/mm.h>
-#include <linux/inet.h>
-#include <linux/netdevice.h>
-#include <net/tcp_states.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <net/net_namespace.h>
-#include <net/icmp.h>
-#include <net/route.h>
-#include <net/checksum.h>
-#include <net/xfrm.h>
-#include "udp_impl.h"
-
-int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
-{
- struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
-
- return ( !ipv6_only_sock(sk2) &&
- (!inet1->rcv_saddr || !inet2->rcv_saddr ||
- inet1->rcv_saddr == inet2->rcv_saddr ));
-}
-
-static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
-{
- return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
-}
-
-/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
- * harder than this. -DaveM
- */
-static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
- __be16 sport, __be32 daddr, __be16 dport,
- int dif, struct hlist_head udptable[])
-{
- struct sock *sk, *result = NULL;
- struct hlist_node *node;
- unsigned short hnum = ntohs(dport);
- int badness = -1;
-
- read_lock(&udp_hash_lock);
- sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
- struct inet_sock *inet = inet_sk(sk);
-
- if (sk->sk_net == net && sk->sk_hash == hnum &&
- !ipv6_only_sock(sk)) {
- int score = (sk->sk_family == PF_INET ? 1 : 0);
- if (inet->rcv_saddr) {
- if (inet->rcv_saddr != daddr)
- continue;
- score+=2;
- }
- if (inet->daddr) {
- if (inet->daddr != saddr)
- continue;
- score+=2;
- }
- if (inet->dport) {
- if (inet->dport != sport)
- continue;
- score+=2;
- }
- if (sk->sk_bound_dev_if) {
- if (sk->sk_bound_dev_if != dif)
- continue;
- score+=2;
- }
- if (score == 9) {
- result = sk;
- break;
- } else if (score > badness) {
- result = sk;
- badness = score;
- }
- }
- }
- if (result)
- sock_hold(result);
- read_unlock(&udp_hash_lock);
- return result;
-}
-
-static inline struct sock *udp_v4_mcast_next(struct sock *sk,
- __be16 loc_port, __be32 loc_addr,
- __be16 rmt_port, __be32 rmt_addr,
- int dif)
-{
- struct hlist_node *node;
- struct sock *s = sk;
- unsigned short hnum = ntohs(loc_port);
-
- sk_for_each_from(s, node) {
- struct inet_sock *inet = inet_sk(s);
-
- if (s->sk_hash != hnum ||
- (inet->daddr && inet->daddr != rmt_addr) ||
- (inet->dport != rmt_port && inet->dport) ||
- (inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
- ipv6_only_sock(s) ||
- (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
- continue;
- if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
- continue;
- goto found;
- }
- s = NULL;
-found:
- return s;
-}
-
-/*
- * This routine is called by the ICMP module when it gets some
- * sort of error condition. If err < 0 then the socket should
- * be closed and the error returned to the user. If err > 0
- * it's just the icmp type << 8 | icmp code.
- * Header points to the ip header of the error packet. We move
- * on past this. Then (as it used to claim before adjustment)
- * header points to the first 8 bytes of the udp header. We need
- * to find the appropriate port.
- */
-
-void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
-{
- struct inet_sock *inet;
- struct iphdr *iph = (struct iphdr*)skb->data;
- struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
- const int type = icmp_hdr(skb)->type;
- const int code = icmp_hdr(skb)->code;
- struct sock *sk;
- int harderr;
- int err;
-
- sk = __udp4_lib_lookup(skb->dev->nd_net, iph->daddr, uh->dest,
- iph->saddr, uh->source, skb->dev->ifindex, udptable);
- if (sk == NULL) {
- ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
- return; /* No socket for error */
- }
-
- err = 0;
- harderr = 0;
- inet = inet_sk(sk);
-
- switch (type) {
- default:
- case ICMP_TIME_EXCEEDED:
- err = EHOSTUNREACH;
- break;
- case ICMP_SOURCE_QUENCH:
- goto out;
- case ICMP_PARAMETERPROB:
- err = EPROTO;
- harderr = 1;
- break;
- case ICMP_DEST_UNREACH:
- if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
- if (inet->pmtudisc != IP_PMTUDISC_DONT) {
- err = EMSGSIZE;
- harderr = 1;
- break;
- }
- goto out;
- }
- err = EHOSTUNREACH;
- if (code <= NR_ICMP_UNREACH) {
- harderr = icmp_err_convert[code].fatal;
- err = icmp_err_convert[code].errno;
- }
- break;
- }
-
- /*
- * RFC1122: OK. Passes ICMP errors back to application, as per
- * 4.1.3.3.
- */
- if (!inet->recverr) {
- if (!harderr || sk->sk_state != TCP_ESTABLISHED)
- goto out;
- } else {
- ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
- }
- sk->sk_err = err;
- sk->sk_error_report(sk);
-out:
- sock_put(sk);
-}
-
-void udp_err(struct sk_buff *skb, u32 info)
-{
- __udp4_lib_err(skb, info, udp_hash);
-}
-
-/*
- * Throw away all pending data and cancel the corking. Socket is locked.
- */
-static void udp_flush_pending_frames(struct sock *sk)
-{
- struct udp_sock *up = udp_sk(sk);
-
- if (up->pending) {
- up->len = 0;
- up->pending = 0;
- ip_flush_pending_frames(sk);
- }
-}
-
-/**
- * udp4_hwcsum_outgoing - handle outgoing HW checksumming
- * @sk: socket we are sending on
- * @skb: sk_buff containing the filled-in UDP header
- * (checksum field must be zeroed out)
- */
-static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
- __be32 src, __be32 dst, int len )
-{
- unsigned int offset;
- struct udphdr *uh = udp_hdr(skb);
- __wsum csum = 0;
-
- if (skb_queue_len(&sk->sk_write_queue) == 1) {
- /*
- * Only one fragment on the socket.
- */
- skb->csum_start = skb_transport_header(skb) - skb->head;
- skb->csum_offset = offsetof(struct udphdr, check);
- uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
- } else {
- /*
- * HW-checksum won't work as there are two or more
- * fragments on the socket so that all csums of sk_buffs
- * should be together
- */
- offset = skb_transport_offset(skb);
- skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
-
- skb->ip_summed = CHECKSUM_NONE;
-
- skb_queue_walk(&sk->sk_write_queue, skb) {
- csum = csum_add(csum, skb->csum);
- }
-
- uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
- if (uh->check == 0)
- uh->check = CSUM_MANGLED_0;
- }
-}
-
-/*
- * Push out all pending data as one UDP datagram. Socket is locked.
- */
-static int udp_push_pending_frames(struct sock *sk)
-{
- struct udp_sock *up = udp_sk(sk);
- struct inet_sock *inet = inet_sk(sk);
- struct flowi *fl = &inet->cork.fl;
- struct sk_buff *skb;
- struct udphdr *uh;
- int err = 0;
- int is_udplite = IS_UDPLITE(sk);
- __wsum csum = 0;
-
- /* Grab the skbuff where UDP header space exists. */
- if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
- goto out;
-
- /*
- * Create a UDP header
- */
- uh = udp_hdr(skb);
- uh->source = fl->fl_ip_sport;
- uh->dest = fl->fl_ip_dport;
- uh->len = htons(up->len);
- uh->check = 0;
-
- if (is_udplite) /* UDP-Lite */
- csum = udplite_csum_outgoing(sk, skb);
-
- else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */
-
- skb->ip_summed = CHECKSUM_NONE;
- goto send;
-
- } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
-
- udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
- goto send;
-
- } else /* `normal' UDP */
- csum = udp_csum_outgoing(sk, skb);
-
- /* add protocol-dependent pseudo-header */
- uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
- sk->sk_protocol, csum );
- if (uh->check == 0)
- uh->check = CSUM_MANGLED_0;
-
-send:
- err = ip_push_pending_frames(sk);
-out:
- up->len = 0;
- up->pending = 0;
- if (!err)
- UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
- return err;
-}
-
-int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
- size_t len)
-{
- struct inet_sock *inet = inet_sk(sk);
- struct udp_sock *up = udp_sk(sk);
- int ulen = len;
- struct ipcm_cookie ipc;
- struct rtable *rt = NULL;
- int free = 0;
- int connected = 0;
- __be32 daddr, faddr, saddr;
- __be16 dport;
- u8 tos;
- int err, is_udplite = IS_UDPLITE(sk);
- int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
- int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
-
- if (len > 0xFFFF)
- return -EMSGSIZE;
-
- /*
- * Check the flags.
- */
-
- if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
- return -EOPNOTSUPP;
-
- ipc.opt = NULL;
-
- if (up->pending) {
- /*
- * There are pending frames.
- * The socket lock must be held while it's corked.
- */
- lock_sock(sk);
- if (likely(up->pending)) {
- if (unlikely(up->pending != AF_INET)) {
- release_sock(sk);
- return -EINVAL;
- }
- goto do_append_data;
- }
- release_sock(sk);
- }
- ulen += sizeof(struct udphdr);
-
- /*
- * Get and verify the address.
- */
- if (msg->msg_name) {
- struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
- if (msg->msg_namelen < sizeof(*usin))
- return -EINVAL;
- if (usin->sin_family != AF_INET) {
- if (usin->sin_family != AF_UNSPEC)
- return -EAFNOSUPPORT;
- }
-
- daddr = usin->sin_addr.s_addr;
- dport = usin->sin_port;
- if (dport == 0)
- return -EINVAL;
- } else {
- if (sk->sk_state != TCP_ESTABLISHED)
- return -EDESTADDRREQ;
- daddr = inet->daddr;
- dport = inet->dport;
- /* Open fast path for connected socket.
- Route will not be used, if at least one option is set.
- */
- connected = 1;
- }
- ipc.addr = inet->saddr;
-
- ipc.oif = sk->sk_bound_dev_if;
- if (msg->msg_controllen) {
- err = ip_cmsg_send(msg, &ipc);
- if (err)
- return err;
- if (ipc.opt)
- free = 1;
- connected = 0;
- }
- if (!ipc.opt)
- ipc.opt = inet->opt;
-
- saddr = ipc.addr;
- ipc.addr = faddr = daddr;
-
- if (ipc.opt && ipc.opt->srr) {
- if (!daddr)
- return -EINVAL;
- faddr = ipc.opt->faddr;
- connected = 0;
- }
- tos = RT_TOS(inet->tos);
- if (sock_flag(sk, SOCK_LOCALROUTE) ||
- (msg->msg_flags & MSG_DONTROUTE) ||
- (ipc.opt && ipc.opt->is_strictroute)) {
- tos |= RTO_ONLINK;
- connected = 0;
- }
-
- if (ipv4_is_multicast(daddr)) {
- if (!ipc.oif)
- ipc.oif = inet->mc_index;
- if (!saddr)
- saddr = inet->mc_addr;
- connected = 0;
- }
-
- if (connected)
- rt = (struct rtable*)sk_dst_check(sk, 0);
-
- if (rt == NULL) {
- struct flowi fl = { .oif = ipc.oif,
- .nl_u = { .ip4_u =
- { .daddr = faddr,
- .saddr = saddr,
- .tos = tos } },
- .proto = sk->sk_protocol,
- .uli_u = { .ports =
- { .sport = inet->sport,
- .dport = dport } } };
- security_sk_classify_flow(sk, &fl);
- err = ip_route_output_flow(&init_net, &rt, &fl, sk, 1);
- if (err) {
- if (err == -ENETUNREACH)
- IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
- goto out;
- }
-
- err = -EACCES;
- if ((rt->rt_flags & RTCF_BROADCAST) &&
- !sock_flag(sk, SOCK_BROADCAST))
- goto out;
- if (connected)
- sk_dst_set(sk, dst_clone(&rt->u.dst));
- }
-
- if (msg->msg_flags&MSG_CONFIRM)
- goto do_confirm;
-back_from_confirm:
-
- saddr = rt->rt_src;
- if (!ipc.addr)
- daddr = ipc.addr = rt->rt_dst;
-
- lock_sock(sk);
- if (unlikely(up->pending)) {
- /* The socket is already corked while preparing it. */
- /* ... which is an evident application bug. --ANK */
- release_sock(sk);
-
- LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
- err = -EINVAL;
- goto out;
- }
- /*
- * Now cork the socket to pend data.
- */
- inet->cork.fl.fl4_dst = daddr;
- inet->cork.fl.fl_ip_dport = dport;
- inet->cork.fl.fl4_src = saddr;
- inet->cork.fl.fl_ip_sport = inet->sport;
- up->pending = AF_INET;
-
-do_append_data:
- up->len += ulen;
- getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
- err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
- sizeof(struct udphdr), &ipc, rt,
- corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
- if (err)
- udp_flush_pending_frames(sk);
- else if (!corkreq)
- err = udp_push_pending_frames(sk);
- else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
- up->pending = 0;
- release_sock(sk);
-
-out:
- ip_rt_put(rt);
- if (free)
- kfree(ipc.opt);
- if (!err)
- return len;
- /*
- * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
- * ENOBUFS might not be good (it's not tunable per se), but otherwise
- * we don't have a good statistic (IpOutDiscards but it can be too many
- * things). We could add another new stat but at least for now that
- * seems like overkill.
- */
- if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
- UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
- }
- return err;
-
-do_confirm:
- dst_confirm(&rt->u.dst);
- if (!(msg->msg_flags&MSG_PROBE) || len)
- goto back_from_confirm;
- err = 0;
- goto out;
-}
-
-int udp_sendpage(struct sock *sk, struct page *page, int offset,
- size_t size, int flags)
-{
- struct udp_sock *up = udp_sk(sk);
- int ret;
-
- if (!up->pending) {
- struct msghdr msg = { .msg_flags = flags|MSG_MORE };
-
- /* Call udp_sendmsg to specify destination address which
- * sendpage interface can't pass.
- * This will succeed only when the socket is connected.
- */
- ret = udp_sendmsg(NULL, sk, &msg, 0);
- if (ret < 0)
- return ret;
- }
-
- lock_sock(sk);
-
- if (unlikely(!up->pending)) {
- release_sock(sk);
-
- LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
- return -EINVAL;
- }
-
- ret = ip_append_page(sk, page, offset, size, flags);
- if (ret == -EOPNOTSUPP) {
- release_sock(sk);
- return sock_no_sendpage(sk->sk_socket, page, offset,
- size, flags);
- }
- if (ret < 0) {
- udp_flush_pending_frames(sk);
- goto out;
- }
-
- up->len += size;
- if (!(up->corkflag || (flags&MSG_MORE)))
- ret = udp_push_pending_frames(sk);
- if (!ret)
- ret = size;
-out:
- release_sock(sk);
- return ret;
-}
-
-/*
- * This should be easy, if there is something there we
- * return it, otherwise we block.
- */
-
-int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
- size_t len, int noblock, int flags, int *addr_len)
-{
- struct inet_sock *inet = inet_sk(sk);
- struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
- struct sk_buff *skb;
- unsigned int ulen, copied;
- int peeked;
- int err;
- int is_udplite = IS_UDPLITE(sk);
-
- /*
- * Check any passed addresses
- */
- if (addr_len)
- *addr_len=sizeof(*sin);
-
- if (flags & MSG_ERRQUEUE)
- return ip_recv_error(sk, msg, len);
-
-try_again:
- skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
- &peeked, &err);
- if (!skb)
- goto out;
-
- ulen = skb->len - sizeof(struct udphdr);
- copied = len;
- if (copied > ulen)
- copied = ulen;
- else if (copied < ulen)
- msg->msg_flags |= MSG_TRUNC;
-
- /*
- * If checksum is needed at all, try to do it while copying the
- * data. If the data is truncated, or if we only want a partial
- * coverage checksum (UDP-Lite), do it before the copy.
- */
-
- if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
- if (udp_lib_checksum_complete(skb))
- goto csum_copy_err;
- }
-
- if (skb_csum_unnecessary(skb))
- err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
- msg->msg_iov, copied );
- else {
- err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
-
- if (err == -EINVAL)
- goto csum_copy_err;
- }
-
- if (err)
- goto out_free;
-
- if (!peeked)
- UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
-
- sock_recv_timestamp(msg, sk, skb);
-
- /* Copy the address. */
- if (sin)
- {
- sin->sin_family = AF_INET;
- sin->sin_port = udp_hdr(skb)->source;
- sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
- memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
- }
- if (inet->cmsg_flags)
- ip_cmsg_recv(msg, skb);
-
- err = copied;
- if (flags & MSG_TRUNC)
- err = ulen;
-
-out_free:
- lock_sock(sk);
- skb_free_datagram(sk, skb);
- release_sock(sk);
-out:
- return err;
-
-csum_copy_err:
- lock_sock(sk);
- if (!skb_kill_datagram(sk, skb, flags))
- UDP_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
- release_sock(sk);
-
- if (noblock)
- return -EAGAIN;
- goto try_again;
-}
-
-
-/* returns:
- * -1: error
- * 0: success
- * >0: "udp encap" protocol resubmission
- *
- * Note that in the success and error cases, the skb is assumed to
- * have either been requeued or freed.
- */
-int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
-{
- struct udp_sock *up = udp_sk(sk);
- int rc;
- int is_udplite = IS_UDPLITE(sk);
-
- /*
- * Charge it to the socket, dropping if the queue is full.
- */
- if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
- goto drop;
- nf_reset(skb);
-
- if (up->encap_type) {
- /*
- * This is an encapsulation socket so pass the skb to
- * the socket's udp_encap_rcv() hook. Otherwise, just
- * fall through and pass this up the UDP socket.
- * up->encap_rcv() returns the following value:
- * =0 if skb was successfully passed to the encap
- * handler or was discarded by it.
- * >0 if skb should be passed on to UDP.
- * <0 if skb should be resubmitted as proto -N
- */
-
- /* if we're overly short, let UDP handle it */
- if (skb->len > sizeof(struct udphdr) &&
- up->encap_rcv != NULL) {
- int ret;
-
- ret = (*up->encap_rcv)(sk, skb);
- if (ret <= 0) {
- UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS,
- is_udplite);
- return -ret;
- }
- }
-
- /* FALLTHROUGH -- it's a UDP Packet */
- }
-
- /*
- * UDP-Lite specific tests, ignored on UDP sockets
- */
- if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
-
- /*
- * MIB statistics other than incrementing the error count are
- * disabled for the following two types of errors: these depend
- * on the application settings, not on the functioning of the
- * protocol stack as such.
- *
- * RFC 3828 here recommends (sec 3.3): "There should also be a
- * way ... to ... at least let the receiving application block
- * delivery of packets with coverage values less than a value
- * provided by the application."
- */
- if (up->pcrlen == 0) { /* full coverage was set */
- LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
- "%d while full coverage %d requested\n",
- UDP_SKB_CB(skb)->cscov, skb->len);
- goto drop;
- }
- /* The next case involves violating the min. coverage requested
- * by the receiver. This is subtle: if receiver wants x and x is
- * greater than the buffersize/MTU then receiver will complain
- * that it wants x while sender emits packets of smaller size y.
- * Therefore the above ...()->partial_cov statement is essential.
- */
- if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
- LIMIT_NETDEBUG(KERN_WARNING
- "UDPLITE: coverage %d too small, need min %d\n",
- UDP_SKB_CB(skb)->cscov, up->pcrlen);
- goto drop;
- }
- }
-
- if (sk->sk_filter) {
- if (udp_lib_checksum_complete(skb))
- goto drop;
- }
-
- if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
- /* Note that an ENOMEM error is charged twice */
- if (rc == -ENOMEM)
- UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
- goto drop;
- }
-
- return 0;
-
-drop:
- UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
- kfree_skb(skb);
- return -1;
-}
-
-/*
- * Multicasts and broadcasts go to each listener.
- *
- * Note: called only from the BH handler context,
- * so we don't need to lock the hashes.
- */
-static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
- struct udphdr *uh,
- __be32 saddr, __be32 daddr,
- struct hlist_head udptable[])
-{
- struct sock *sk;
- int dif;
-
- read_lock(&udp_hash_lock);
- sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
- dif = skb->dev->ifindex;
- sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
- if (sk) {
- struct sock *sknext = NULL;
-
- do {
- struct sk_buff *skb1 = skb;
-
- sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
- uh->source, saddr, dif);
- if (sknext)
- skb1 = skb_clone(skb, GFP_ATOMIC);
-
- if (skb1) {
- int ret = 0;
-
- bh_lock_sock_nested(sk);
- if (!sock_owned_by_user(sk))
- ret = udp_queue_rcv_skb(sk, skb1);
- else
- sk_add_backlog(sk, skb1);
- bh_unlock_sock(sk);
-
- if (ret > 0)
- /* we should probably re-process instead
- * of dropping packets here. */
- kfree_skb(skb1);
- }
- sk = sknext;
- } while (sknext);
- } else
- kfree_skb(skb);
- read_unlock(&udp_hash_lock);
- return 0;
-}
-
-/* Initialize UDP checksum. If exited with zero value (success),
- * CHECKSUM_UNNECESSARY means, that no more checks are required.
- * Otherwise, csum completion requires chacksumming packet body,
- * including udp header and folding it to skb->csum.
- */
-static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
- int proto)
-{
- const struct iphdr *iph;
- int err;
-
- UDP_SKB_CB(skb)->partial_cov = 0;
- UDP_SKB_CB(skb)->cscov = skb->len;
-
- if (IS_PROTO_UDPLITE(proto)) {
- err = udplite_checksum_init(skb, uh);
- if (err)
- return err;
- }
-
- iph = ip_hdr(skb);
- if (uh->check == 0) {
- skb->ip_summed = CHECKSUM_UNNECESSARY;
- } else if (skb->ip_summed == CHECKSUM_COMPLETE) {
- if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
- proto, skb->csum))
- skb->ip_summed = CHECKSUM_UNNECESSARY;
- }
- if (!skb_csum_unnecessary(skb))
- skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
- skb->len, proto, 0);
- /* Probably, we should checksum udp header (it should be in cache
- * in any case) and data in tiny packets (< rx copybreak).
- */
-
- return 0;
-}
-
-/*
- * All we need to do is get the socket, and then do a checksum.
- */
-
-int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
- int proto)
-{
- struct sock *sk;
- struct udphdr *uh = udp_hdr(skb);
- unsigned short ulen;
- struct rtable *rt = skb->rtable;
- __be32 saddr = ip_hdr(skb)->saddr;
- __be32 daddr = ip_hdr(skb)->daddr;
-
- /*
- * Validate the packet.
- */
- if (!pskb_may_pull(skb, sizeof(struct udphdr)))
- goto drop; /* No space for header. */
-
- ulen = ntohs(uh->len);
- if (ulen > skb->len)
- goto short_packet;
-
- if (IS_PROTO_UDPLITE(proto)) {
- /* UDP validates ulen. */
- if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
- goto short_packet;
- uh = udp_hdr(skb);
- }
-
- if (udp4_csum_init(skb, uh, proto))
- goto csum_error;
-
- if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
- return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
-
- sk = __udp4_lib_lookup(skb->dev->nd_net, saddr, uh->source, daddr,
- uh->dest, inet_iif(skb), udptable);
-
- if (sk != NULL) {
- int ret = 0;
- bh_lock_sock_nested(sk);
- if (!sock_owned_by_user(sk))
- ret = udp_queue_rcv_skb(sk, skb);
- else
- sk_add_backlog(sk, skb);
- bh_unlock_sock(sk);
- sock_put(sk);
-
- /* a return value > 0 means to resubmit the input, but
- * it wants the return to be -protocol, or 0
- */
- if (ret > 0)
- return -ret;
- return 0;
- }
-
- if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
- goto drop;
- nf_reset(skb);
-
- /* No socket. Drop packet silently, if checksum is wrong */
- if (udp_lib_checksum_complete(skb))
- goto csum_error;
-
- UDP_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
- icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
-
- /*
- * Hmm. We got an UDP packet to a port to which we
- * don't wanna listen. Ignore it.
- */
- kfree_skb(skb);
- return 0;
-
-short_packet:
- LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
- IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
- NIPQUAD(saddr),
- ntohs(uh->source),
- ulen,
- skb->len,
- NIPQUAD(daddr),
- ntohs(uh->dest));
- goto drop;
-
-csum_error:
- /*
- * RFC1122: OK. Discards the bad packet silently (as far as
- * the network is concerned, anyway) as per 4.1.3.4 (MUST).
- */
- LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
- IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
- NIPQUAD(saddr),
- ntohs(uh->source),
- NIPQUAD(daddr),
- ntohs(uh->dest),
- ulen);
-drop:
- UDP_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
- kfree_skb(skb);
- return 0;
-}
-
-int udp_rcv(struct sk_buff *skb)
-{
- return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
-}
-
-int udp_destroy_sock(struct sock *sk)
-{
- lock_sock(sk);
- udp_flush_pending_frames(sk);
- release_sock(sk);
- return 0;
-}
-
-int udp_setsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int optlen)
-{
- if (IS_SOL_UDPFAMILY(level))
- return udp_lib_setsockopt(sk, level, optname, optval, optlen,
- udp_push_pending_frames);
- return ip_setsockopt(sk, level, optname, optval, optlen);
-}
-
-#ifdef CONFIG_COMPAT
-int compat_udp_setsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int optlen)
-{
- if (IS_SOL_UDPFAMILY(level))
- return udp_lib_setsockopt(sk, level, optname, optval, optlen,
- udp_push_pending_frames);
- return compat_ip_setsockopt(sk, level, optname, optval, optlen);
-}
-#endif
-
-int udp_getsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int __user *optlen)
-{
- if (IS_SOL_UDPFAMILY(level))
- return udp_lib_getsockopt(sk, level, optname, optval, optlen);
- return ip_getsockopt(sk, level, optname, optval, optlen);
-}
-
-#ifdef CONFIG_COMPAT
-int compat_udp_getsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int __user *optlen)
-{
- if (IS_SOL_UDPFAMILY(level))
- return udp_lib_getsockopt(sk, level, optname, optval, optlen);
- return compat_ip_getsockopt(sk, level, optname, optval, optlen);
-}
-#endif
-
-/* ------------------------------------------------------------------------ */
-DEFINE_PROTO_INUSE(udp)
-
-struct proto udp_prot = {
- .name = "UDP",
- .owner = THIS_MODULE,
- .close = udp_lib_close,
- .connect = ip4_datagram_connect,
- .disconnect = udp_disconnect,
- .ioctl = udp_ioctl,
- .destroy = udp_destroy_sock,
- .setsockopt = udp_setsockopt,
- .getsockopt = udp_getsockopt,
- .sendmsg = udp_sendmsg,
- .recvmsg = udp_recvmsg,
- .sendpage = udp_sendpage,
- .backlog_rcv = udp_queue_rcv_skb,
- .hash = udp_lib_hash,
- .unhash = udp_lib_unhash,
- .get_port = udp_v4_get_port,
- .memory_allocated = &udp_memory_allocated,
- .sysctl_mem = sysctl_udp_mem,
- .sysctl_wmem = &sysctl_udp_wmem_min,
- .sysctl_rmem = &sysctl_udp_rmem_min,
- .obj_size = sizeof(struct udp_sock),
-#ifdef CONFIG_COMPAT
- .compat_setsockopt = compat_udp_setsockopt,
- .compat_getsockopt = compat_udp_getsockopt,
-#endif
- REF_PROTO_INUSE(udp)
-};
-
-/* ------------------------------------------------------------------------ */
-static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
-{
- struct inet_sock *inet = inet_sk(sp);
- __be32 dest = inet->daddr;
- __be32 src = inet->rcv_saddr;
- __u16 destp = ntohs(inet->dport);
- __u16 srcp = ntohs(inet->sport);
-
- sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
- " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
- bucket, src, srcp, dest, destp, sp->sk_state,
- atomic_read(&sp->sk_wmem_alloc),
- atomic_read(&sp->sk_rmem_alloc),
- 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
- atomic_read(&sp->sk_refcnt), sp);
-}
-
-int udp4_seq_show(struct seq_file *seq, void *v)
-{
- if (v == SEQ_START_TOKEN)
- seq_printf(seq, "%-127s\n",
- " sl local_address rem_address st tx_queue "
- "rx_queue tr tm->when retrnsmt uid timeout "
- "inode");
- else {
- char tmpbuf[129];
- struct udp_iter_state *state = seq->private;
-
- udp4_format_sock(v, tmpbuf, state->bucket);
- seq_printf(seq, "%-127s\n", tmpbuf);
- }
- return 0;
-}
-
-/* ------------------------------------------------------------------------ */
-#ifdef CONFIG_PROC_FS
-static struct file_operations udp4_seq_fops;
-static struct udp_seq_afinfo udp4_seq_afinfo = {
- .owner = THIS_MODULE,
- .name = "udp",
- .family = AF_INET,
- .hashtable = udp_hash,
- .seq_show = udp4_seq_show,
- .seq_fops = &udp4_seq_fops,
-};
-
-int __init udp4_proc_init(void)
-{
- return udp_proc_register(&udp4_seq_afinfo);
-}
-
-void udp4_proc_exit(void)
-{
- udp_proc_unregister(&udp4_seq_afinfo);
-}
-#endif /* CONFIG_PROC_FS */
-
-EXPORT_SYMBOL(udp_prot);
-EXPORT_SYMBOL(udp_sendmsg);
-