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1091 lines
25 KiB
1091 lines
25 KiB
/*
|
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* UDP over IPv6
|
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* Linux INET6 implementation
|
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*
|
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* Authors:
|
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* Pedro Roque <roque@di.fc.ul.pt>
|
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*
|
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* Based on linux/ipv4/udp.c
|
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*
|
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* $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
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*
|
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* Fixes:
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* Hideaki YOSHIFUJI : sin6_scope_id support
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* YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
|
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* Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
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* a single port at the same time.
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* Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
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* YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
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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 <linux/config.h>
|
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/sched.h>
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#include <linux/net.h>
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#include <linux/in6.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/ipv6.h>
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#include <linux/icmpv6.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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|
|
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#include <net/sock.h>
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#include <net/snmp.h>
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|
|
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#include <net/ipv6.h>
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#include <net/ndisc.h>
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|
#include <net/protocol.h>
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|
#include <net/transp_v6.h>
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|
#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/ip.h>
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|
#include <net/udp.h>
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#include <net/raw.h>
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#include <net/inet_common.h>
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#include <net/tcp_states.h>
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|
|
|
#include <net/ip6_checksum.h>
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#include <net/xfrm.h>
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|
|
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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|
|
|
DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
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|
|
|
/* Grrr, addr_type already calculated by caller, but I don't want
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* to add some silly "cookie" argument to this method just for that.
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*/
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static int udp_v6_get_port(struct sock *sk, unsigned short snum)
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|
{
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|
struct sock *sk2;
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struct hlist_node *node;
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|
|
|
write_lock_bh(&udp_hash_lock);
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if (snum == 0) {
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int best_size_so_far, best, result, i;
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if (udp_port_rover > sysctl_local_port_range[1] ||
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udp_port_rover < sysctl_local_port_range[0])
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udp_port_rover = sysctl_local_port_range[0];
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best_size_so_far = 32767;
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best = result = udp_port_rover;
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for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
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int size;
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struct hlist_head *list;
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|
|
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list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
|
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if (hlist_empty(list)) {
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if (result > sysctl_local_port_range[1])
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result = sysctl_local_port_range[0] +
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((result - sysctl_local_port_range[0]) &
|
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(UDP_HTABLE_SIZE - 1));
|
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goto gotit;
|
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}
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size = 0;
|
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sk_for_each(sk2, node, list)
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if (++size >= best_size_so_far)
|
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goto next;
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|
best_size_so_far = size;
|
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best = result;
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next:;
|
|
}
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result = best;
|
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for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
|
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if (result > sysctl_local_port_range[1])
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result = sysctl_local_port_range[0]
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+ ((result - sysctl_local_port_range[0]) &
|
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(UDP_HTABLE_SIZE - 1));
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if (!udp_lport_inuse(result))
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break;
|
|
}
|
|
if (i >= (1 << 16) / UDP_HTABLE_SIZE)
|
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goto fail;
|
|
gotit:
|
|
udp_port_rover = snum = result;
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} else {
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sk_for_each(sk2, node,
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&udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
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if (inet_sk(sk2)->num == snum &&
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sk2 != sk &&
|
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(!sk2->sk_bound_dev_if ||
|
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!sk->sk_bound_dev_if ||
|
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sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
|
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(!sk2->sk_reuse || !sk->sk_reuse) &&
|
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ipv6_rcv_saddr_equal(sk, sk2))
|
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goto fail;
|
|
}
|
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}
|
|
|
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inet_sk(sk)->num = snum;
|
|
if (sk_unhashed(sk)) {
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sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
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sock_prot_inc_use(sk->sk_prot);
|
|
}
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write_unlock_bh(&udp_hash_lock);
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return 0;
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|
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fail:
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write_unlock_bh(&udp_hash_lock);
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return 1;
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|
}
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|
static void udp_v6_hash(struct sock *sk)
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{
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BUG();
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}
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static void udp_v6_unhash(struct sock *sk)
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|
{
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|
write_lock_bh(&udp_hash_lock);
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if (sk_del_node_init(sk)) {
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inet_sk(sk)->num = 0;
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sock_prot_dec_use(sk->sk_prot);
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}
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write_unlock_bh(&udp_hash_lock);
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}
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static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
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struct in6_addr *daddr, u16 dport, int dif)
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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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read_lock(&udp_hash_lock);
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sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
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struct inet_sock *inet = inet_sk(sk);
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if (inet->num == hnum && sk->sk_family == PF_INET6) {
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struct ipv6_pinfo *np = inet6_sk(sk);
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int score = 0;
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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++;
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}
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if (!ipv6_addr_any(&np->rcv_saddr)) {
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if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
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continue;
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score++;
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}
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if (!ipv6_addr_any(&np->daddr)) {
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if (!ipv6_addr_equal(&np->daddr, saddr))
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continue;
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score++;
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}
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if (sk->sk_bound_dev_if) {
|
|
if (sk->sk_bound_dev_if != dif)
|
|
continue;
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score++;
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}
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if(score == 4) {
|
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result = sk;
|
|
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)
|
|
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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/*
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*
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*/
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static void udpv6_close(struct sock *sk, long timeout)
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{
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sk_common_release(sk);
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}
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/*
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|
* This should be easy, if there is something there we
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* return it, otherwise we block.
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*/
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static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len,
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int noblock, int flags, int *addr_len)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct inet_sock *inet = inet_sk(sk);
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struct sk_buff *skb;
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size_t copied;
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int err;
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if (addr_len)
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*addr_len=sizeof(struct sockaddr_in6);
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if (flags & MSG_ERRQUEUE)
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return ipv6_recv_error(sk, msg, len);
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try_again:
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skb = skb_recv_datagram(sk, flags, noblock, &err);
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if (!skb)
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goto out;
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copied = skb->len - sizeof(struct udphdr);
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if (copied > len) {
|
|
copied = len;
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msg->msg_flags |= MSG_TRUNC;
|
|
}
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|
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if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
|
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err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
|
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copied);
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} else if (msg->msg_flags&MSG_TRUNC) {
|
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if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
|
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goto csum_copy_err;
|
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err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
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copied);
|
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} else {
|
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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;
|
|
|
|
sock_recv_timestamp(msg, sk, skb);
|
|
|
|
/* Copy the address. */
|
|
if (msg->msg_name) {
|
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struct sockaddr_in6 *sin6;
|
|
|
|
sin6 = (struct sockaddr_in6 *) msg->msg_name;
|
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sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_port = skb->h.uh->source;
|
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sin6->sin6_flowinfo = 0;
|
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sin6->sin6_scope_id = 0;
|
|
|
|
if (skb->protocol == htons(ETH_P_IP))
|
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ipv6_addr_set(&sin6->sin6_addr, 0, 0,
|
|
htonl(0xffff), skb->nh.iph->saddr);
|
|
else {
|
|
ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
|
|
if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
|
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sin6->sin6_scope_id = IP6CB(skb)->iif;
|
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}
|
|
|
|
}
|
|
if (skb->protocol == htons(ETH_P_IP)) {
|
|
if (inet->cmsg_flags)
|
|
ip_cmsg_recv(msg, skb);
|
|
} else {
|
|
if (np->rxopt.all)
|
|
datagram_recv_ctl(sk, msg, skb);
|
|
}
|
|
|
|
err = copied;
|
|
if (flags & MSG_TRUNC)
|
|
err = skb->len - sizeof(struct udphdr);
|
|
|
|
out_free:
|
|
skb_free_datagram(sk, skb);
|
|
out:
|
|
return err;
|
|
|
|
csum_copy_err:
|
|
/* Clear queue. */
|
|
if (flags&MSG_PEEK) {
|
|
int clear = 0;
|
|
spin_lock_bh(&sk->sk_receive_queue.lock);
|
|
if (skb == skb_peek(&sk->sk_receive_queue)) {
|
|
__skb_unlink(skb, &sk->sk_receive_queue);
|
|
clear = 1;
|
|
}
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock);
|
|
if (clear)
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
skb_free_datagram(sk, skb);
|
|
|
|
if (flags & MSG_DONTWAIT) {
|
|
UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
|
|
return -EAGAIN;
|
|
}
|
|
goto try_again;
|
|
}
|
|
|
|
static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
int type, int code, int offset, __u32 info)
|
|
{
|
|
struct ipv6_pinfo *np;
|
|
struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
|
|
struct net_device *dev = skb->dev;
|
|
struct in6_addr *saddr = &hdr->saddr;
|
|
struct in6_addr *daddr = &hdr->daddr;
|
|
struct udphdr *uh = (struct udphdr*)(skb->data+offset);
|
|
struct sock *sk;
|
|
int err;
|
|
|
|
sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
|
|
|
|
if (sk == NULL)
|
|
return;
|
|
|
|
np = inet6_sk(sk);
|
|
|
|
if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
|
|
goto out;
|
|
|
|
if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
|
|
goto out;
|
|
|
|
if (np->recverr)
|
|
ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
|
|
|
|
sk->sk_err = err;
|
|
sk->sk_error_report(sk);
|
|
out:
|
|
sock_put(sk);
|
|
}
|
|
|
|
static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
|
|
{
|
|
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
|
|
if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
|
|
if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
|
|
UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
}
|
|
|
|
if (sock_queue_rcv_skb(sk,skb)<0) {
|
|
UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
|
|
return 0;
|
|
}
|
|
|
|
static struct sock *udp_v6_mcast_next(struct sock *sk,
|
|
u16 loc_port, struct in6_addr *loc_addr,
|
|
u16 rmt_port, struct in6_addr *rmt_addr,
|
|
int dif)
|
|
{
|
|
struct hlist_node *node;
|
|
struct sock *s = sk;
|
|
unsigned short num = ntohs(loc_port);
|
|
|
|
sk_for_each_from(s, node) {
|
|
struct inet_sock *inet = inet_sk(s);
|
|
|
|
if (inet->num == num && s->sk_family == PF_INET6) {
|
|
struct ipv6_pinfo *np = inet6_sk(s);
|
|
if (inet->dport) {
|
|
if (inet->dport != rmt_port)
|
|
continue;
|
|
}
|
|
if (!ipv6_addr_any(&np->daddr) &&
|
|
!ipv6_addr_equal(&np->daddr, rmt_addr))
|
|
continue;
|
|
|
|
if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
|
|
continue;
|
|
|
|
if (!ipv6_addr_any(&np->rcv_saddr)) {
|
|
if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
|
|
continue;
|
|
}
|
|
if(!inet6_mc_check(s, loc_addr, rmt_addr))
|
|
continue;
|
|
return s;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Note: called only from the BH handler context,
|
|
* so we don't need to lock the hashes.
|
|
*/
|
|
static void udpv6_mcast_deliver(struct udphdr *uh,
|
|
struct in6_addr *saddr, struct in6_addr *daddr,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct sock *sk, *sk2;
|
|
int dif;
|
|
|
|
read_lock(&udp_hash_lock);
|
|
sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
|
|
dif = skb->dev->ifindex;
|
|
sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
|
|
if (!sk) {
|
|
kfree_skb(skb);
|
|
goto out;
|
|
}
|
|
|
|
sk2 = sk;
|
|
while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
|
|
uh->source, saddr, dif))) {
|
|
struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
|
|
if (buff)
|
|
udpv6_queue_rcv_skb(sk2, buff);
|
|
}
|
|
udpv6_queue_rcv_skb(sk, skb);
|
|
out:
|
|
read_unlock(&udp_hash_lock);
|
|
}
|
|
|
|
static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
|
|
{
|
|
struct sk_buff *skb = *pskb;
|
|
struct sock *sk;
|
|
struct udphdr *uh;
|
|
struct net_device *dev = skb->dev;
|
|
struct in6_addr *saddr, *daddr;
|
|
u32 ulen = 0;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct udphdr)))
|
|
goto short_packet;
|
|
|
|
saddr = &skb->nh.ipv6h->saddr;
|
|
daddr = &skb->nh.ipv6h->daddr;
|
|
uh = skb->h.uh;
|
|
|
|
ulen = ntohs(uh->len);
|
|
|
|
/* Check for jumbo payload */
|
|
if (ulen == 0)
|
|
ulen = skb->len;
|
|
|
|
if (ulen > skb->len || ulen < sizeof(*uh))
|
|
goto short_packet;
|
|
|
|
if (uh->check == 0) {
|
|
/* RFC 2460 section 8.1 says that we SHOULD log
|
|
this error. Well, it is reasonable.
|
|
*/
|
|
LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
|
|
goto discard;
|
|
}
|
|
|
|
if (ulen < skb->len) {
|
|
if (pskb_trim_rcsum(skb, ulen))
|
|
goto discard;
|
|
saddr = &skb->nh.ipv6h->saddr;
|
|
daddr = &skb->nh.ipv6h->daddr;
|
|
uh = skb->h.uh;
|
|
}
|
|
|
|
if (skb->ip_summed==CHECKSUM_HW) {
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
|
|
LIMIT_NETDEBUG(KERN_DEBUG "udp v6 hw csum failure.\n");
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
}
|
|
}
|
|
if (skb->ip_summed != CHECKSUM_UNNECESSARY)
|
|
skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
|
|
|
|
/*
|
|
* Multicast receive code
|
|
*/
|
|
if (ipv6_addr_is_multicast(daddr)) {
|
|
udpv6_mcast_deliver(uh, saddr, daddr, skb);
|
|
return 0;
|
|
}
|
|
|
|
/* Unicast */
|
|
|
|
/*
|
|
* check socket cache ... must talk to Alan about his plans
|
|
* for sock caches... i'll skip this for now.
|
|
*/
|
|
sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
|
|
|
|
if (sk == NULL) {
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto discard;
|
|
|
|
if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
|
|
(unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
|
|
goto discard;
|
|
UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
|
|
|
|
kfree_skb(skb);
|
|
return(0);
|
|
}
|
|
|
|
/* deliver */
|
|
|
|
udpv6_queue_rcv_skb(sk, skb);
|
|
sock_put(sk);
|
|
return(0);
|
|
|
|
short_packet:
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
|
|
|
|
discard:
|
|
UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
|
|
kfree_skb(skb);
|
|
return(0);
|
|
}
|
|
/*
|
|
* Throw away all pending data and cancel the corking. Socket is locked.
|
|
*/
|
|
static void udp_v6_flush_pending_frames(struct sock *sk)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
|
|
if (up->pending) {
|
|
up->len = 0;
|
|
up->pending = 0;
|
|
ip6_flush_pending_frames(sk);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Sending
|
|
*/
|
|
|
|
static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct udphdr *uh;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct flowi *fl = &inet->cork.fl;
|
|
int err = 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 = skb->h.uh;
|
|
uh->source = fl->fl_ip_sport;
|
|
uh->dest = fl->fl_ip_dport;
|
|
uh->len = htons(up->len);
|
|
uh->check = 0;
|
|
|
|
if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
goto send;
|
|
}
|
|
|
|
if (skb_queue_len(&sk->sk_write_queue) == 1) {
|
|
skb->csum = csum_partial((char *)uh,
|
|
sizeof(struct udphdr), skb->csum);
|
|
uh->check = csum_ipv6_magic(&fl->fl6_src,
|
|
&fl->fl6_dst,
|
|
up->len, fl->proto, skb->csum);
|
|
} else {
|
|
u32 tmp_csum = 0;
|
|
|
|
skb_queue_walk(&sk->sk_write_queue, skb) {
|
|
tmp_csum = csum_add(tmp_csum, skb->csum);
|
|
}
|
|
tmp_csum = csum_partial((char *)uh,
|
|
sizeof(struct udphdr), tmp_csum);
|
|
tmp_csum = csum_ipv6_magic(&fl->fl6_src,
|
|
&fl->fl6_dst,
|
|
up->len, fl->proto, tmp_csum);
|
|
uh->check = tmp_csum;
|
|
|
|
}
|
|
if (uh->check == 0)
|
|
uh->check = -1;
|
|
|
|
send:
|
|
err = ip6_push_pending_frames(sk);
|
|
out:
|
|
up->len = 0;
|
|
up->pending = 0;
|
|
return err;
|
|
}
|
|
|
|
static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
|
|
struct msghdr *msg, size_t len)
|
|
{
|
|
struct ipv6_txoptions opt_space;
|
|
struct udp_sock *up = udp_sk(sk);
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
|
|
struct in6_addr *daddr, *final_p = NULL, final;
|
|
struct ipv6_txoptions *opt = NULL;
|
|
struct ip6_flowlabel *flowlabel = NULL;
|
|
struct flowi *fl = &inet->cork.fl;
|
|
struct dst_entry *dst;
|
|
int addr_len = msg->msg_namelen;
|
|
int ulen = len;
|
|
int hlimit = -1;
|
|
int tclass = -1;
|
|
int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
|
|
int err;
|
|
int connected = 0;
|
|
|
|
/* destination address check */
|
|
if (sin6) {
|
|
if (addr_len < offsetof(struct sockaddr, sa_data))
|
|
return -EINVAL;
|
|
|
|
switch (sin6->sin6_family) {
|
|
case AF_INET6:
|
|
if (addr_len < SIN6_LEN_RFC2133)
|
|
return -EINVAL;
|
|
daddr = &sin6->sin6_addr;
|
|
break;
|
|
case AF_INET:
|
|
goto do_udp_sendmsg;
|
|
case AF_UNSPEC:
|
|
msg->msg_name = sin6 = NULL;
|
|
msg->msg_namelen = addr_len = 0;
|
|
daddr = NULL;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
} else if (!up->pending) {
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -EDESTADDRREQ;
|
|
daddr = &np->daddr;
|
|
} else
|
|
daddr = NULL;
|
|
|
|
if (daddr) {
|
|
if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
|
|
struct sockaddr_in sin;
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
|
|
sin.sin_addr.s_addr = daddr->s6_addr32[3];
|
|
msg->msg_name = &sin;
|
|
msg->msg_namelen = sizeof(sin);
|
|
do_udp_sendmsg:
|
|
if (__ipv6_only_sock(sk))
|
|
return -ENETUNREACH;
|
|
return udp_sendmsg(iocb, sk, msg, len);
|
|
}
|
|
}
|
|
|
|
if (up->pending == AF_INET)
|
|
return udp_sendmsg(iocb, sk, msg, len);
|
|
|
|
/* Rough check on arithmetic overflow,
|
|
better check is made in ip6_build_xmit
|
|
*/
|
|
if (len > INT_MAX - sizeof(struct udphdr))
|
|
return -EMSGSIZE;
|
|
|
|
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_INET6)) {
|
|
release_sock(sk);
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
dst = NULL;
|
|
goto do_append_data;
|
|
}
|
|
release_sock(sk);
|
|
}
|
|
ulen += sizeof(struct udphdr);
|
|
|
|
memset(fl, 0, sizeof(*fl));
|
|
|
|
if (sin6) {
|
|
if (sin6->sin6_port == 0)
|
|
return -EINVAL;
|
|
|
|
fl->fl_ip_dport = sin6->sin6_port;
|
|
daddr = &sin6->sin6_addr;
|
|
|
|
if (np->sndflow) {
|
|
fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
|
|
if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
|
|
flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
|
|
if (flowlabel == NULL)
|
|
return -EINVAL;
|
|
daddr = &flowlabel->dst;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Otherwise it will be difficult to maintain
|
|
* sk->sk_dst_cache.
|
|
*/
|
|
if (sk->sk_state == TCP_ESTABLISHED &&
|
|
ipv6_addr_equal(daddr, &np->daddr))
|
|
daddr = &np->daddr;
|
|
|
|
if (addr_len >= sizeof(struct sockaddr_in6) &&
|
|
sin6->sin6_scope_id &&
|
|
ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
|
|
fl->oif = sin6->sin6_scope_id;
|
|
} else {
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -EDESTADDRREQ;
|
|
|
|
fl->fl_ip_dport = inet->dport;
|
|
daddr = &np->daddr;
|
|
fl->fl6_flowlabel = np->flow_label;
|
|
connected = 1;
|
|
}
|
|
|
|
if (!fl->oif)
|
|
fl->oif = sk->sk_bound_dev_if;
|
|
|
|
if (msg->msg_controllen) {
|
|
opt = &opt_space;
|
|
memset(opt, 0, sizeof(struct ipv6_txoptions));
|
|
opt->tot_len = sizeof(*opt);
|
|
|
|
err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
|
|
if (err < 0) {
|
|
fl6_sock_release(flowlabel);
|
|
return err;
|
|
}
|
|
if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
|
|
flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
|
|
if (flowlabel == NULL)
|
|
return -EINVAL;
|
|
}
|
|
if (!(opt->opt_nflen|opt->opt_flen))
|
|
opt = NULL;
|
|
connected = 0;
|
|
}
|
|
if (opt == NULL)
|
|
opt = np->opt;
|
|
opt = fl6_merge_options(&opt_space, flowlabel, opt);
|
|
|
|
fl->proto = IPPROTO_UDP;
|
|
ipv6_addr_copy(&fl->fl6_dst, daddr);
|
|
if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
|
|
ipv6_addr_copy(&fl->fl6_src, &np->saddr);
|
|
fl->fl_ip_sport = inet->sport;
|
|
|
|
/* merge ip6_build_xmit from ip6_output */
|
|
if (opt && opt->srcrt) {
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
|
|
ipv6_addr_copy(&final, &fl->fl6_dst);
|
|
ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
|
|
final_p = &final;
|
|
connected = 0;
|
|
}
|
|
|
|
if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
|
|
fl->oif = np->mcast_oif;
|
|
connected = 0;
|
|
}
|
|
|
|
err = ip6_dst_lookup(sk, &dst, fl);
|
|
if (err)
|
|
goto out;
|
|
if (final_p)
|
|
ipv6_addr_copy(&fl->fl6_dst, final_p);
|
|
|
|
if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
|
|
goto out;
|
|
|
|
if (hlimit < 0) {
|
|
if (ipv6_addr_is_multicast(&fl->fl6_dst))
|
|
hlimit = np->mcast_hops;
|
|
else
|
|
hlimit = np->hop_limit;
|
|
if (hlimit < 0)
|
|
hlimit = dst_metric(dst, RTAX_HOPLIMIT);
|
|
if (hlimit < 0)
|
|
hlimit = ipv6_get_hoplimit(dst->dev);
|
|
}
|
|
|
|
if (tclass < 0) {
|
|
tclass = np->tclass;
|
|
if (tclass < 0)
|
|
tclass = 0;
|
|
}
|
|
|
|
if (msg->msg_flags&MSG_CONFIRM)
|
|
goto do_confirm;
|
|
back_from_confirm:
|
|
|
|
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;
|
|
}
|
|
|
|
up->pending = AF_INET6;
|
|
|
|
do_append_data:
|
|
up->len += ulen;
|
|
err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
|
|
sizeof(struct udphdr), hlimit, tclass, opt, fl,
|
|
(struct rt6_info*)dst,
|
|
corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
|
|
if (err)
|
|
udp_v6_flush_pending_frames(sk);
|
|
else if (!corkreq)
|
|
err = udp_v6_push_pending_frames(sk, up);
|
|
|
|
if (dst) {
|
|
if (connected) {
|
|
ip6_dst_store(sk, dst,
|
|
ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
|
|
&np->daddr : NULL);
|
|
} else {
|
|
dst_release(dst);
|
|
}
|
|
}
|
|
|
|
if (err > 0)
|
|
err = np->recverr ? net_xmit_errno(err) : 0;
|
|
release_sock(sk);
|
|
out:
|
|
fl6_sock_release(flowlabel);
|
|
if (!err) {
|
|
UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
|
|
return len;
|
|
}
|
|
return err;
|
|
|
|
do_confirm:
|
|
dst_confirm(dst);
|
|
if (!(msg->msg_flags&MSG_PROBE) || len)
|
|
goto back_from_confirm;
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
static int udpv6_destroy_sock(struct sock *sk)
|
|
{
|
|
lock_sock(sk);
|
|
udp_v6_flush_pending_frames(sk);
|
|
release_sock(sk);
|
|
|
|
inet6_destroy_sock(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Socket option code for UDP
|
|
*/
|
|
static int udpv6_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int optlen)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
int val;
|
|
int err = 0;
|
|
|
|
if (level != SOL_UDP)
|
|
return ipv6_setsockopt(sk, level, optname, optval, optlen);
|
|
|
|
if(optlen<sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(val, (int __user *)optval))
|
|
return -EFAULT;
|
|
|
|
switch(optname) {
|
|
case UDP_CORK:
|
|
if (val != 0) {
|
|
up->corkflag = 1;
|
|
} else {
|
|
up->corkflag = 0;
|
|
lock_sock(sk);
|
|
udp_v6_push_pending_frames(sk, up);
|
|
release_sock(sk);
|
|
}
|
|
break;
|
|
|
|
case UDP_ENCAP:
|
|
switch (val) {
|
|
case 0:
|
|
up->encap_type = val;
|
|
break;
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
};
|
|
|
|
return err;
|
|
}
|
|
|
|
static int udpv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
int val, len;
|
|
|
|
if (level != SOL_UDP)
|
|
return ipv6_getsockopt(sk, level, optname, optval, optlen);
|
|
|
|
if(get_user(len,optlen))
|
|
return -EFAULT;
|
|
|
|
len = min_t(unsigned int, len, sizeof(int));
|
|
|
|
if(len < 0)
|
|
return -EINVAL;
|
|
|
|
switch(optname) {
|
|
case UDP_CORK:
|
|
val = up->corkflag;
|
|
break;
|
|
|
|
case UDP_ENCAP:
|
|
val = up->encap_type;
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
};
|
|
|
|
if(put_user(len, optlen))
|
|
return -EFAULT;
|
|
if(copy_to_user(optval, &val,len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static struct inet6_protocol udpv6_protocol = {
|
|
.handler = udpv6_rcv,
|
|
.err_handler = udpv6_err,
|
|
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
|
|
};
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sp);
|
|
struct ipv6_pinfo *np = inet6_sk(sp);
|
|
struct in6_addr *dest, *src;
|
|
__u16 destp, srcp;
|
|
|
|
dest = &np->daddr;
|
|
src = &np->rcv_saddr;
|
|
destp = ntohs(inet->dport);
|
|
srcp = ntohs(inet->sport);
|
|
seq_printf(seq,
|
|
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
|
"%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
|
|
bucket,
|
|
src->s6_addr32[0], src->s6_addr32[1],
|
|
src->s6_addr32[2], src->s6_addr32[3], srcp,
|
|
dest->s6_addr32[0], dest->s6_addr32[1],
|
|
dest->s6_addr32[2], dest->s6_addr32[3], 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);
|
|
}
|
|
|
|
static int udp6_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_printf(seq,
|
|
" sl "
|
|
"local_address "
|
|
"remote_address "
|
|
"st tx_queue rx_queue tr tm->when retrnsmt"
|
|
" uid timeout inode\n");
|
|
else
|
|
udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
|
|
return 0;
|
|
}
|
|
|
|
static struct file_operations udp6_seq_fops;
|
|
static struct udp_seq_afinfo udp6_seq_afinfo = {
|
|
.owner = THIS_MODULE,
|
|
.name = "udp6",
|
|
.family = AF_INET6,
|
|
.seq_show = udp6_seq_show,
|
|
.seq_fops = &udp6_seq_fops,
|
|
};
|
|
|
|
int __init udp6_proc_init(void)
|
|
{
|
|
return udp_proc_register(&udp6_seq_afinfo);
|
|
}
|
|
|
|
void udp6_proc_exit(void) {
|
|
udp_proc_unregister(&udp6_seq_afinfo);
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
struct proto udpv6_prot = {
|
|
.name = "UDPv6",
|
|
.owner = THIS_MODULE,
|
|
.close = udpv6_close,
|
|
.connect = ip6_datagram_connect,
|
|
.disconnect = udp_disconnect,
|
|
.ioctl = udp_ioctl,
|
|
.destroy = udpv6_destroy_sock,
|
|
.setsockopt = udpv6_setsockopt,
|
|
.getsockopt = udpv6_getsockopt,
|
|
.sendmsg = udpv6_sendmsg,
|
|
.recvmsg = udpv6_recvmsg,
|
|
.backlog_rcv = udpv6_queue_rcv_skb,
|
|
.hash = udp_v6_hash,
|
|
.unhash = udp_v6_unhash,
|
|
.get_port = udp_v6_get_port,
|
|
.obj_size = sizeof(struct udp6_sock),
|
|
};
|
|
|
|
static struct inet_protosw udpv6_protosw = {
|
|
.type = SOCK_DGRAM,
|
|
.protocol = IPPROTO_UDP,
|
|
.prot = &udpv6_prot,
|
|
.ops = &inet6_dgram_ops,
|
|
.capability =-1,
|
|
.no_check = UDP_CSUM_DEFAULT,
|
|
.flags = INET_PROTOSW_PERMANENT,
|
|
};
|
|
|
|
|
|
void __init udpv6_init(void)
|
|
{
|
|
if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
|
|
printk(KERN_ERR "udpv6_init: Could not register protocol\n");
|
|
inet6_register_protosw(&udpv6_protosw);
|
|
}
|
|
|