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@@ -1,1134 +0,0 @@
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-/*
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- * INET An implementation of the TCP/IP protocol suite for the LINUX
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- * operating system. INET is implemented using the BSD Socket
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- * interface as the means of communication with the user level.
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- *
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- * UDP for IPv4.
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- *
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- * For full credits, see net/ipv4/udp.c.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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- */
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-
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-#include <asm/system.h>
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-#include <asm/uaccess.h>
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-#include <asm/ioctls.h>
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-#include <linux/bootmem.h>
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-#include <linux/types.h>
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-#include <linux/fcntl.h>
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-#include <linux/module.h>
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-#include <linux/socket.h>
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-#include <linux/sockios.h>
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-#include <linux/igmp.h>
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-#include <linux/in.h>
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-#include <linux/errno.h>
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-#include <linux/timer.h>
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-#include <linux/mm.h>
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-#include <linux/inet.h>
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-#include <linux/netdevice.h>
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-#include <net/tcp_states.h>
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-#include <linux/skbuff.h>
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-#include <linux/proc_fs.h>
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-#include <linux/seq_file.h>
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-#include <net/net_namespace.h>
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-#include <net/icmp.h>
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-#include <net/route.h>
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-#include <net/checksum.h>
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-#include <net/xfrm.h>
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-#include "udp_impl.h"
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-
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-int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
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-{
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- struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
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-
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- return ( !ipv6_only_sock(sk2) &&
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- (!inet1->rcv_saddr || !inet2->rcv_saddr ||
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- inet1->rcv_saddr == inet2->rcv_saddr ));
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-}
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-
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-static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
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-{
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- return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
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-}
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-
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-/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
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- * harder than this. -DaveM
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- */
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-static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
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- __be16 sport, __be32 daddr, __be16 dport,
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- int dif, struct hlist_head udptable[])
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-{
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- struct sock *sk, *result = NULL;
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- struct hlist_node *node;
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- unsigned short hnum = ntohs(dport);
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- int badness = -1;
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-
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- read_lock(&udp_hash_lock);
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- sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
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- struct inet_sock *inet = inet_sk(sk);
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-
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- if (sk->sk_net == net && sk->sk_hash == hnum &&
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- !ipv6_only_sock(sk)) {
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- int score = (sk->sk_family == PF_INET ? 1 : 0);
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- if (inet->rcv_saddr) {
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- if (inet->rcv_saddr != daddr)
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- continue;
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- score+=2;
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- }
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- if (inet->daddr) {
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- if (inet->daddr != saddr)
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- continue;
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- score+=2;
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- }
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- if (inet->dport) {
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- if (inet->dport != sport)
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- continue;
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- score+=2;
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- }
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- if (sk->sk_bound_dev_if) {
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- if (sk->sk_bound_dev_if != dif)
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- continue;
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- score+=2;
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- }
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- if (score == 9) {
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- result = sk;
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- break;
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- } else if (score > badness) {
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- result = sk;
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- badness = score;
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- }
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- }
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- }
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- if (result)
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- sock_hold(result);
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- read_unlock(&udp_hash_lock);
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- return result;
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-}
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-
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-static inline struct sock *udp_v4_mcast_next(struct sock *sk,
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- __be16 loc_port, __be32 loc_addr,
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- __be16 rmt_port, __be32 rmt_addr,
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- int dif)
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-{
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- struct hlist_node *node;
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- struct sock *s = sk;
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- unsigned short hnum = ntohs(loc_port);
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-
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- sk_for_each_from(s, node) {
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- struct inet_sock *inet = inet_sk(s);
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-
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- if (s->sk_hash != hnum ||
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- (inet->daddr && inet->daddr != rmt_addr) ||
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- (inet->dport != rmt_port && inet->dport) ||
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- (inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
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- ipv6_only_sock(s) ||
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- (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
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- continue;
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- if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
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- continue;
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- goto found;
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- }
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- s = NULL;
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-found:
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- return s;
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-}
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-
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-/*
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- * This routine is called by the ICMP module when it gets some
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- * sort of error condition. If err < 0 then the socket should
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- * be closed and the error returned to the user. If err > 0
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- * it's just the icmp type << 8 | icmp code.
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- * Header points to the ip header of the error packet. We move
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- * on past this. Then (as it used to claim before adjustment)
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- * header points to the first 8 bytes of the udp header. We need
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- * to find the appropriate port.
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- */
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-
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-void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
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-{
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- struct inet_sock *inet;
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- struct iphdr *iph = (struct iphdr*)skb->data;
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- struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
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- const int type = icmp_hdr(skb)->type;
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- const int code = icmp_hdr(skb)->code;
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- struct sock *sk;
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- int harderr;
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- int err;
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-
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- sk = __udp4_lib_lookup(skb->dev->nd_net, iph->daddr, uh->dest,
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- iph->saddr, uh->source, skb->dev->ifindex, udptable);
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- if (sk == NULL) {
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- ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
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- return; /* No socket for error */
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- }
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-
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- err = 0;
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- harderr = 0;
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- inet = inet_sk(sk);
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-
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- switch (type) {
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- default:
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- case ICMP_TIME_EXCEEDED:
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- err = EHOSTUNREACH;
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- break;
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- case ICMP_SOURCE_QUENCH:
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- goto out;
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- case ICMP_PARAMETERPROB:
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- err = EPROTO;
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- harderr = 1;
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- break;
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- case ICMP_DEST_UNREACH:
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- if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
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- if (inet->pmtudisc != IP_PMTUDISC_DONT) {
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- err = EMSGSIZE;
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- harderr = 1;
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- break;
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- }
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- goto out;
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- }
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- err = EHOSTUNREACH;
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- if (code <= NR_ICMP_UNREACH) {
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- harderr = icmp_err_convert[code].fatal;
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- err = icmp_err_convert[code].errno;
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- }
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- break;
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- }
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-
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- /*
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- * RFC1122: OK. Passes ICMP errors back to application, as per
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- * 4.1.3.3.
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- */
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- if (!inet->recverr) {
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- if (!harderr || sk->sk_state != TCP_ESTABLISHED)
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- goto out;
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- } else {
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- ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
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- }
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- sk->sk_err = err;
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- sk->sk_error_report(sk);
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-out:
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- sock_put(sk);
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-}
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-
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-void udp_err(struct sk_buff *skb, u32 info)
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-{
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- __udp4_lib_err(skb, info, udp_hash);
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-}
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-
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-/*
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- * Throw away all pending data and cancel the corking. Socket is locked.
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- */
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-static void udp_flush_pending_frames(struct sock *sk)
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-{
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- struct udp_sock *up = udp_sk(sk);
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-
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- if (up->pending) {
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- up->len = 0;
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- up->pending = 0;
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- ip_flush_pending_frames(sk);
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- }
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-}
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-
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-/**
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- * udp4_hwcsum_outgoing - handle outgoing HW checksumming
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- * @sk: socket we are sending on
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- * @skb: sk_buff containing the filled-in UDP header
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- * (checksum field must be zeroed out)
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- */
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-static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
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- __be32 src, __be32 dst, int len )
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-{
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- unsigned int offset;
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- struct udphdr *uh = udp_hdr(skb);
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- __wsum csum = 0;
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-
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- if (skb_queue_len(&sk->sk_write_queue) == 1) {
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- /*
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- * Only one fragment on the socket.
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- */
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- skb->csum_start = skb_transport_header(skb) - skb->head;
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- skb->csum_offset = offsetof(struct udphdr, check);
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- uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
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- } else {
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- /*
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- * HW-checksum won't work as there are two or more
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- * fragments on the socket so that all csums of sk_buffs
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- * should be together
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- */
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- offset = skb_transport_offset(skb);
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- skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
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-
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- skb->ip_summed = CHECKSUM_NONE;
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-
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- skb_queue_walk(&sk->sk_write_queue, skb) {
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- csum = csum_add(csum, skb->csum);
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- }
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-
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- uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
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- if (uh->check == 0)
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- uh->check = CSUM_MANGLED_0;
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- }
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-}
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-
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-/*
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- * Push out all pending data as one UDP datagram. Socket is locked.
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- */
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-static int udp_push_pending_frames(struct sock *sk)
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-{
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- struct udp_sock *up = udp_sk(sk);
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- struct inet_sock *inet = inet_sk(sk);
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- struct flowi *fl = &inet->cork.fl;
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- struct sk_buff *skb;
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- struct udphdr *uh;
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- int err = 0;
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- int is_udplite = IS_UDPLITE(sk);
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- __wsum csum = 0;
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-
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- /* Grab the skbuff where UDP header space exists. */
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- if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
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- goto out;
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-
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- /*
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- * Create a UDP header
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- */
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- uh = udp_hdr(skb);
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- uh->source = fl->fl_ip_sport;
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- uh->dest = fl->fl_ip_dport;
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- uh->len = htons(up->len);
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- uh->check = 0;
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-
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- if (is_udplite) /* UDP-Lite */
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- csum = udplite_csum_outgoing(sk, skb);
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-
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- else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */
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-
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- skb->ip_summed = CHECKSUM_NONE;
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- goto send;
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-
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- } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
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-
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- udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
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- goto send;
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-
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- } else /* `normal' UDP */
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- csum = udp_csum_outgoing(sk, skb);
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-
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- /* add protocol-dependent pseudo-header */
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- uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
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- sk->sk_protocol, csum );
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- if (uh->check == 0)
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- uh->check = CSUM_MANGLED_0;
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-
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-send:
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- err = ip_push_pending_frames(sk);
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-out:
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- up->len = 0;
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- up->pending = 0;
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- if (!err)
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- UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
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- return err;
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-}
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-
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-int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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- size_t len)
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-{
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- struct inet_sock *inet = inet_sk(sk);
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- struct udp_sock *up = udp_sk(sk);
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- int ulen = len;
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- struct ipcm_cookie ipc;
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- struct rtable *rt = NULL;
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- int free = 0;
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- int connected = 0;
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- __be32 daddr, faddr, saddr;
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- __be16 dport;
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- u8 tos;
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- int err, is_udplite = IS_UDPLITE(sk);
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- int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
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- int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
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-
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- if (len > 0xFFFF)
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- return -EMSGSIZE;
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-
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- /*
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- * Check the flags.
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- */
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-
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- if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
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- return -EOPNOTSUPP;
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-
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- ipc.opt = NULL;
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-
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- if (up->pending) {
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- /*
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- * There are pending frames.
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- * The socket lock must be held while it's corked.
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- */
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- lock_sock(sk);
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- if (likely(up->pending)) {
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- if (unlikely(up->pending != AF_INET)) {
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- release_sock(sk);
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- return -EINVAL;
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- }
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- goto do_append_data;
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- }
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- release_sock(sk);
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- }
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- ulen += sizeof(struct udphdr);
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-
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- /*
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- * Get and verify the address.
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- */
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- if (msg->msg_name) {
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- struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
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- if (msg->msg_namelen < sizeof(*usin))
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- return -EINVAL;
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- if (usin->sin_family != AF_INET) {
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- if (usin->sin_family != AF_UNSPEC)
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- return -EAFNOSUPPORT;
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- }
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-
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- daddr = usin->sin_addr.s_addr;
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- dport = usin->sin_port;
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- if (dport == 0)
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- return -EINVAL;
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- } else {
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- if (sk->sk_state != TCP_ESTABLISHED)
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- return -EDESTADDRREQ;
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- daddr = inet->daddr;
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- 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);
|
|
|
-
|
David S. Miller