| 1 |
1275 |
phoenix |
/*
|
| 2 |
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* TCP over IPv6
|
| 3 |
|
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* Linux INET6 implementation
|
| 4 |
|
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*
|
| 5 |
|
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* Authors:
|
| 6 |
|
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* Pedro Roque <roque@di.fc.ul.pt>
|
| 7 |
|
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*
|
| 8 |
|
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* $Id: tcp_ipv6.c,v 1.1.1.1 2004-04-15 01:14:36 phoenix Exp $
|
| 9 |
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*
|
| 10 |
|
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* Based on:
|
| 11 |
|
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* linux/net/ipv4/tcp.c
|
| 12 |
|
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* linux/net/ipv4/tcp_input.c
|
| 13 |
|
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* linux/net/ipv4/tcp_output.c
|
| 14 |
|
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*
|
| 15 |
|
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* Fixes:
|
| 16 |
|
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* Hideaki YOSHIFUJI : sin6_scope_id support
|
| 17 |
|
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* YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
|
| 18 |
|
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* Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
|
| 19 |
|
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* a single port at the same time.
|
| 20 |
|
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*
|
| 21 |
|
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* This program is free software; you can redistribute it and/or
|
| 22 |
|
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* modify it under the terms of the GNU General Public License
|
| 23 |
|
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* as published by the Free Software Foundation; either version
|
| 24 |
|
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* 2 of the License, or (at your option) any later version.
|
| 25 |
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*/
|
| 26 |
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| 27 |
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#include <linux/module.h>
|
| 28 |
|
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#include <linux/config.h>
|
| 29 |
|
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#include <linux/errno.h>
|
| 30 |
|
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#include <linux/types.h>
|
| 31 |
|
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#include <linux/socket.h>
|
| 32 |
|
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#include <linux/sockios.h>
|
| 33 |
|
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#include <linux/net.h>
|
| 34 |
|
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#include <linux/sched.h>
|
| 35 |
|
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#include <linux/in.h>
|
| 36 |
|
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#include <linux/in6.h>
|
| 37 |
|
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#include <linux/netdevice.h>
|
| 38 |
|
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#include <linux/init.h>
|
| 39 |
|
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#include <linux/jhash.h>
|
| 40 |
|
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#include <linux/ipsec.h>
|
| 41 |
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|
| 42 |
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#include <linux/ipv6.h>
|
| 43 |
|
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#include <linux/icmpv6.h>
|
| 44 |
|
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#include <linux/random.h>
|
| 45 |
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|
| 46 |
|
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#include <net/tcp.h>
|
| 47 |
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#include <net/ndisc.h>
|
| 48 |
|
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#include <net/ipv6.h>
|
| 49 |
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#include <net/transp_v6.h>
|
| 50 |
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#include <net/addrconf.h>
|
| 51 |
|
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#include <net/ip6_route.h>
|
| 52 |
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#include <net/inet_ecn.h>
|
| 53 |
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|
| 54 |
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#include <asm/uaccess.h>
|
| 55 |
|
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|
| 56 |
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static void tcp_v6_send_reset(struct sk_buff *skb);
|
| 57 |
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static void tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req);
|
| 58 |
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static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len,
|
| 59 |
|
|
struct sk_buff *skb);
|
| 60 |
|
|
|
| 61 |
|
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static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
|
| 62 |
|
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static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok);
|
| 63 |
|
|
|
| 64 |
|
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static struct tcp_func ipv6_mapped;
|
| 65 |
|
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static struct tcp_func ipv6_specific;
|
| 66 |
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|
|
| 67 |
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/* I have no idea if this is a good hash for v6 or not. -DaveM */
|
| 68 |
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static __inline__ int tcp_v6_hashfn(struct in6_addr *laddr, u16 lport,
|
| 69 |
|
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struct in6_addr *faddr, u16 fport)
|
| 70 |
|
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{
|
| 71 |
|
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int hashent = (lport ^ fport);
|
| 72 |
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|
|
| 73 |
|
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hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
|
| 74 |
|
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hashent ^= hashent>>16;
|
| 75 |
|
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hashent ^= hashent>>8;
|
| 76 |
|
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return (hashent & (tcp_ehash_size - 1));
|
| 77 |
|
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}
|
| 78 |
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|
|
| 79 |
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static __inline__ int tcp_v6_sk_hashfn(struct sock *sk)
|
| 80 |
|
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{
|
| 81 |
|
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struct in6_addr *laddr = &sk->net_pinfo.af_inet6.rcv_saddr;
|
| 82 |
|
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struct in6_addr *faddr = &sk->net_pinfo.af_inet6.daddr;
|
| 83 |
|
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__u16 lport = sk->num;
|
| 84 |
|
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__u16 fport = sk->dport;
|
| 85 |
|
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return tcp_v6_hashfn(laddr, lport, faddr, fport);
|
| 86 |
|
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}
|
| 87 |
|
|
|
| 88 |
|
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/* Grrr, addr_type already calculated by caller, but I don't want
|
| 89 |
|
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* to add some silly "cookie" argument to this method just for that.
|
| 90 |
|
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* But it doesn't matter, the recalculation is in the rarest path
|
| 91 |
|
|
* this function ever takes.
|
| 92 |
|
|
*/
|
| 93 |
|
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static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
|
| 94 |
|
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{
|
| 95 |
|
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struct tcp_bind_hashbucket *head;
|
| 96 |
|
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struct tcp_bind_bucket *tb;
|
| 97 |
|
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int ret;
|
| 98 |
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|
|
| 99 |
|
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local_bh_disable();
|
| 100 |
|
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if (snum == 0) {
|
| 101 |
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int low = sysctl_local_port_range[0];
|
| 102 |
|
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int high = sysctl_local_port_range[1];
|
| 103 |
|
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int remaining = (high - low) + 1;
|
| 104 |
|
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int rover;
|
| 105 |
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|
| 106 |
|
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spin_lock(&tcp_portalloc_lock);
|
| 107 |
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rover = tcp_port_rover;
|
| 108 |
|
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do { rover++;
|
| 109 |
|
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if ((rover < low) || (rover > high))
|
| 110 |
|
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rover = low;
|
| 111 |
|
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head = &tcp_bhash[tcp_bhashfn(rover)];
|
| 112 |
|
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spin_lock(&head->lock);
|
| 113 |
|
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for (tb = head->chain; tb; tb = tb->next)
|
| 114 |
|
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if (tb->port == rover)
|
| 115 |
|
|
goto next;
|
| 116 |
|
|
break;
|
| 117 |
|
|
next:
|
| 118 |
|
|
spin_unlock(&head->lock);
|
| 119 |
|
|
} while (--remaining > 0);
|
| 120 |
|
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tcp_port_rover = rover;
|
| 121 |
|
|
spin_unlock(&tcp_portalloc_lock);
|
| 122 |
|
|
|
| 123 |
|
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/* Exhausted local port range during search? */
|
| 124 |
|
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ret = 1;
|
| 125 |
|
|
if (remaining <= 0)
|
| 126 |
|
|
goto fail;
|
| 127 |
|
|
|
| 128 |
|
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/* OK, here is the one we will use. */
|
| 129 |
|
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snum = rover;
|
| 130 |
|
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tb = NULL;
|
| 131 |
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} else {
|
| 132 |
|
|
head = &tcp_bhash[tcp_bhashfn(snum)];
|
| 133 |
|
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spin_lock(&head->lock);
|
| 134 |
|
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for (tb = head->chain; tb != NULL; tb = tb->next)
|
| 135 |
|
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if (tb->port == snum)
|
| 136 |
|
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break;
|
| 137 |
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}
|
| 138 |
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if (tb != NULL && tb->owners != NULL) {
|
| 139 |
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if (tb->fastreuse > 0 && sk->reuse != 0 && sk->state != TCP_LISTEN) {
|
| 140 |
|
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goto success;
|
| 141 |
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} else {
|
| 142 |
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struct sock *sk2 = tb->owners;
|
| 143 |
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int sk_reuse = sk->reuse;
|
| 144 |
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int addr_type = ipv6_addr_type(&sk->net_pinfo.af_inet6.rcv_saddr);
|
| 145 |
|
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|
| 146 |
|
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/* We must walk the whole port owner list in this case. -DaveM */
|
| 147 |
|
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for( ; sk2 != NULL; sk2 = sk2->bind_next) {
|
| 148 |
|
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if (sk != sk2 &&
|
| 149 |
|
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(!sk->bound_dev_if ||
|
| 150 |
|
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!sk2->bound_dev_if ||
|
| 151 |
|
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sk->bound_dev_if == sk2->bound_dev_if)) {
|
| 152 |
|
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if (!sk_reuse ||
|
| 153 |
|
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!sk2->reuse ||
|
| 154 |
|
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sk2->state == TCP_LISTEN) {
|
| 155 |
|
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/* NOTE: IPv6 tw bucket have different format */
|
| 156 |
|
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if ((!sk2->rcv_saddr && !ipv6_only_sock(sk)) ||
|
| 157 |
|
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(sk2->family == AF_INET6 &&
|
| 158 |
|
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ipv6_addr_any(&sk2->net_pinfo.af_inet6.rcv_saddr) &&
|
| 159 |
|
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!(ipv6_only_sock(sk2) && addr_type == IPV6_ADDR_MAPPED)) ||
|
| 160 |
|
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(addr_type == IPV6_ADDR_ANY &&
|
| 161 |
|
|
(!ipv6_only_sock(sk) ||
|
| 162 |
|
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!(sk2->family == AF_INET6 ? ipv6_addr_type(&sk2->net_pinfo.af_inet6.rcv_saddr) == IPV6_ADDR_MAPPED : 1))) ||
|
| 163 |
|
|
(sk2->family == AF_INET6 &&
|
| 164 |
|
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!ipv6_addr_cmp(&sk->net_pinfo.af_inet6.rcv_saddr,
|
| 165 |
|
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sk2->state != TCP_TIME_WAIT ?
|
| 166 |
|
|
&sk2->net_pinfo.af_inet6.rcv_saddr :
|
| 167 |
|
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&((struct tcp_tw_bucket*)sk)->v6_rcv_saddr)) ||
|
| 168 |
|
|
(addr_type == IPV6_ADDR_MAPPED &&
|
| 169 |
|
|
!ipv6_only_sock(sk2) &&
|
| 170 |
|
|
(!sk2->rcv_saddr ||
|
| 171 |
|
|
!sk->rcv_saddr ||
|
| 172 |
|
|
sk->rcv_saddr == sk2->rcv_saddr)))
|
| 173 |
|
|
break;
|
| 174 |
|
|
}
|
| 175 |
|
|
}
|
| 176 |
|
|
}
|
| 177 |
|
|
/* If we found a conflict, fail. */
|
| 178 |
|
|
ret = 1;
|
| 179 |
|
|
if (sk2 != NULL)
|
| 180 |
|
|
goto fail_unlock;
|
| 181 |
|
|
}
|
| 182 |
|
|
}
|
| 183 |
|
|
ret = 1;
|
| 184 |
|
|
if (tb == NULL &&
|
| 185 |
|
|
(tb = tcp_bucket_create(head, snum)) == NULL)
|
| 186 |
|
|
goto fail_unlock;
|
| 187 |
|
|
if (tb->owners == NULL) {
|
| 188 |
|
|
if (sk->reuse && sk->state != TCP_LISTEN)
|
| 189 |
|
|
tb->fastreuse = 1;
|
| 190 |
|
|
else
|
| 191 |
|
|
tb->fastreuse = 0;
|
| 192 |
|
|
} else if (tb->fastreuse &&
|
| 193 |
|
|
((sk->reuse == 0) || (sk->state == TCP_LISTEN)))
|
| 194 |
|
|
tb->fastreuse = 0;
|
| 195 |
|
|
|
| 196 |
|
|
success:
|
| 197 |
|
|
sk->num = snum;
|
| 198 |
|
|
if (sk->prev == NULL) {
|
| 199 |
|
|
if ((sk->bind_next = tb->owners) != NULL)
|
| 200 |
|
|
tb->owners->bind_pprev = &sk->bind_next;
|
| 201 |
|
|
tb->owners = sk;
|
| 202 |
|
|
sk->bind_pprev = &tb->owners;
|
| 203 |
|
|
sk->prev = (struct sock *) tb;
|
| 204 |
|
|
} else {
|
| 205 |
|
|
BUG_TRAP(sk->prev == (struct sock *) tb);
|
| 206 |
|
|
}
|
| 207 |
|
|
ret = 0;
|
| 208 |
|
|
|
| 209 |
|
|
fail_unlock:
|
| 210 |
|
|
spin_unlock(&head->lock);
|
| 211 |
|
|
fail:
|
| 212 |
|
|
local_bh_enable();
|
| 213 |
|
|
return ret;
|
| 214 |
|
|
}
|
| 215 |
|
|
|
| 216 |
|
|
static __inline__ void __tcp_v6_hash(struct sock *sk)
|
| 217 |
|
|
{
|
| 218 |
|
|
struct sock **skp;
|
| 219 |
|
|
rwlock_t *lock;
|
| 220 |
|
|
|
| 221 |
|
|
BUG_TRAP(sk->pprev==NULL);
|
| 222 |
|
|
|
| 223 |
|
|
if(sk->state == TCP_LISTEN) {
|
| 224 |
|
|
skp = &tcp_listening_hash[tcp_sk_listen_hashfn(sk)];
|
| 225 |
|
|
lock = &tcp_lhash_lock;
|
| 226 |
|
|
tcp_listen_wlock();
|
| 227 |
|
|
} else {
|
| 228 |
|
|
skp = &tcp_ehash[(sk->hashent = tcp_v6_sk_hashfn(sk))].chain;
|
| 229 |
|
|
lock = &tcp_ehash[sk->hashent].lock;
|
| 230 |
|
|
write_lock(lock);
|
| 231 |
|
|
}
|
| 232 |
|
|
|
| 233 |
|
|
if((sk->next = *skp) != NULL)
|
| 234 |
|
|
(*skp)->pprev = &sk->next;
|
| 235 |
|
|
*skp = sk;
|
| 236 |
|
|
sk->pprev = skp;
|
| 237 |
|
|
sock_prot_inc_use(sk->prot);
|
| 238 |
|
|
write_unlock(lock);
|
| 239 |
|
|
}
|
| 240 |
|
|
|
| 241 |
|
|
|
| 242 |
|
|
static void tcp_v6_hash(struct sock *sk)
|
| 243 |
|
|
{
|
| 244 |
|
|
if(sk->state != TCP_CLOSE) {
|
| 245 |
|
|
if (sk->tp_pinfo.af_tcp.af_specific == &ipv6_mapped) {
|
| 246 |
|
|
tcp_prot.hash(sk);
|
| 247 |
|
|
return;
|
| 248 |
|
|
}
|
| 249 |
|
|
local_bh_disable();
|
| 250 |
|
|
__tcp_v6_hash(sk);
|
| 251 |
|
|
local_bh_enable();
|
| 252 |
|
|
}
|
| 253 |
|
|
}
|
| 254 |
|
|
|
| 255 |
|
|
static struct sock *tcp_v6_lookup_listener(struct in6_addr *daddr, unsigned short hnum, int dif)
|
| 256 |
|
|
{
|
| 257 |
|
|
struct sock *sk;
|
| 258 |
|
|
struct sock *result = NULL;
|
| 259 |
|
|
int score, hiscore;
|
| 260 |
|
|
|
| 261 |
|
|
hiscore=0;
|
| 262 |
|
|
read_lock(&tcp_lhash_lock);
|
| 263 |
|
|
sk = tcp_listening_hash[tcp_lhashfn(hnum)];
|
| 264 |
|
|
for(; sk; sk = sk->next) {
|
| 265 |
|
|
if((sk->num == hnum) && (sk->family == PF_INET6)) {
|
| 266 |
|
|
struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
|
| 267 |
|
|
|
| 268 |
|
|
score = 1;
|
| 269 |
|
|
if(!ipv6_addr_any(&np->rcv_saddr)) {
|
| 270 |
|
|
if(ipv6_addr_cmp(&np->rcv_saddr, daddr))
|
| 271 |
|
|
continue;
|
| 272 |
|
|
score++;
|
| 273 |
|
|
}
|
| 274 |
|
|
if (sk->bound_dev_if) {
|
| 275 |
|
|
if (sk->bound_dev_if != dif)
|
| 276 |
|
|
continue;
|
| 277 |
|
|
score++;
|
| 278 |
|
|
}
|
| 279 |
|
|
if (score == 3) {
|
| 280 |
|
|
result = sk;
|
| 281 |
|
|
break;
|
| 282 |
|
|
}
|
| 283 |
|
|
if (score > hiscore) {
|
| 284 |
|
|
hiscore = score;
|
| 285 |
|
|
result = sk;
|
| 286 |
|
|
}
|
| 287 |
|
|
}
|
| 288 |
|
|
}
|
| 289 |
|
|
if (result)
|
| 290 |
|
|
sock_hold(result);
|
| 291 |
|
|
read_unlock(&tcp_lhash_lock);
|
| 292 |
|
|
return result;
|
| 293 |
|
|
}
|
| 294 |
|
|
|
| 295 |
|
|
/* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
|
| 296 |
|
|
* we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
|
| 297 |
|
|
*
|
| 298 |
|
|
* The sockhash lock must be held as a reader here.
|
| 299 |
|
|
*/
|
| 300 |
|
|
|
| 301 |
|
|
static inline struct sock *__tcp_v6_lookup_established(struct in6_addr *saddr, u16 sport,
|
| 302 |
|
|
struct in6_addr *daddr, u16 hnum,
|
| 303 |
|
|
int dif)
|
| 304 |
|
|
{
|
| 305 |
|
|
struct tcp_ehash_bucket *head;
|
| 306 |
|
|
struct sock *sk;
|
| 307 |
|
|
__u32 ports = TCP_COMBINED_PORTS(sport, hnum);
|
| 308 |
|
|
int hash;
|
| 309 |
|
|
|
| 310 |
|
|
/* Optimize here for direct hit, only listening connections can
|
| 311 |
|
|
* have wildcards anyways.
|
| 312 |
|
|
*/
|
| 313 |
|
|
hash = tcp_v6_hashfn(daddr, hnum, saddr, sport);
|
| 314 |
|
|
head = &tcp_ehash[hash];
|
| 315 |
|
|
read_lock(&head->lock);
|
| 316 |
|
|
for(sk = head->chain; sk; sk = sk->next) {
|
| 317 |
|
|
/* For IPV6 do the cheaper port and family tests first. */
|
| 318 |
|
|
if(TCP_IPV6_MATCH(sk, saddr, daddr, ports, dif))
|
| 319 |
|
|
goto hit; /* You sunk my battleship! */
|
| 320 |
|
|
}
|
| 321 |
|
|
/* Must check for a TIME_WAIT'er before going to listener hash. */
|
| 322 |
|
|
for(sk = (head + tcp_ehash_size)->chain; sk; sk = sk->next) {
|
| 323 |
|
|
if(*((__u32 *)&(sk->dport)) == ports &&
|
| 324 |
|
|
sk->family == PF_INET6) {
|
| 325 |
|
|
struct tcp_tw_bucket *tw = (struct tcp_tw_bucket *)sk;
|
| 326 |
|
|
if(!ipv6_addr_cmp(&tw->v6_daddr, saddr) &&
|
| 327 |
|
|
!ipv6_addr_cmp(&tw->v6_rcv_saddr, daddr) &&
|
| 328 |
|
|
(!sk->bound_dev_if || sk->bound_dev_if == dif))
|
| 329 |
|
|
goto hit;
|
| 330 |
|
|
}
|
| 331 |
|
|
}
|
| 332 |
|
|
read_unlock(&head->lock);
|
| 333 |
|
|
return NULL;
|
| 334 |
|
|
|
| 335 |
|
|
hit:
|
| 336 |
|
|
sock_hold(sk);
|
| 337 |
|
|
read_unlock(&head->lock);
|
| 338 |
|
|
return sk;
|
| 339 |
|
|
}
|
| 340 |
|
|
|
| 341 |
|
|
|
| 342 |
|
|
static inline struct sock *__tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
|
| 343 |
|
|
struct in6_addr *daddr, u16 hnum,
|
| 344 |
|
|
int dif)
|
| 345 |
|
|
{
|
| 346 |
|
|
struct sock *sk;
|
| 347 |
|
|
|
| 348 |
|
|
sk = __tcp_v6_lookup_established(saddr, sport, daddr, hnum, dif);
|
| 349 |
|
|
|
| 350 |
|
|
if (sk)
|
| 351 |
|
|
return sk;
|
| 352 |
|
|
|
| 353 |
|
|
return tcp_v6_lookup_listener(daddr, hnum, dif);
|
| 354 |
|
|
}
|
| 355 |
|
|
|
| 356 |
|
|
inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
|
| 357 |
|
|
struct in6_addr *daddr, u16 dport,
|
| 358 |
|
|
int dif)
|
| 359 |
|
|
{
|
| 360 |
|
|
struct sock *sk;
|
| 361 |
|
|
|
| 362 |
|
|
local_bh_disable();
|
| 363 |
|
|
sk = __tcp_v6_lookup(saddr, sport, daddr, ntohs(dport), dif);
|
| 364 |
|
|
local_bh_enable();
|
| 365 |
|
|
|
| 366 |
|
|
return sk;
|
| 367 |
|
|
}
|
| 368 |
|
|
|
| 369 |
|
|
|
| 370 |
|
|
/*
|
| 371 |
|
|
* Open request hash tables.
|
| 372 |
|
|
*/
|
| 373 |
|
|
|
| 374 |
|
|
static u32 tcp_v6_synq_hash(struct in6_addr *raddr, u16 rport, u32 rnd)
|
| 375 |
|
|
{
|
| 376 |
|
|
u32 a, b, c;
|
| 377 |
|
|
|
| 378 |
|
|
a = raddr->s6_addr32[0];
|
| 379 |
|
|
b = raddr->s6_addr32[1];
|
| 380 |
|
|
c = raddr->s6_addr32[2];
|
| 381 |
|
|
|
| 382 |
|
|
a += JHASH_GOLDEN_RATIO;
|
| 383 |
|
|
b += JHASH_GOLDEN_RATIO;
|
| 384 |
|
|
c += rnd;
|
| 385 |
|
|
__jhash_mix(a, b, c);
|
| 386 |
|
|
|
| 387 |
|
|
a += raddr->s6_addr32[3];
|
| 388 |
|
|
b += (u32) rport;
|
| 389 |
|
|
__jhash_mix(a, b, c);
|
| 390 |
|
|
|
| 391 |
|
|
return c & (TCP_SYNQ_HSIZE - 1);
|
| 392 |
|
|
}
|
| 393 |
|
|
|
| 394 |
|
|
static struct open_request *tcp_v6_search_req(struct tcp_opt *tp,
|
| 395 |
|
|
struct open_request ***prevp,
|
| 396 |
|
|
__u16 rport,
|
| 397 |
|
|
struct in6_addr *raddr,
|
| 398 |
|
|
struct in6_addr *laddr,
|
| 399 |
|
|
int iif)
|
| 400 |
|
|
{
|
| 401 |
|
|
struct tcp_listen_opt *lopt = tp->listen_opt;
|
| 402 |
|
|
struct open_request *req, **prev;
|
| 403 |
|
|
|
| 404 |
|
|
for (prev = &lopt->syn_table[tcp_v6_synq_hash(raddr, rport, lopt->hash_rnd)];
|
| 405 |
|
|
(req = *prev) != NULL;
|
| 406 |
|
|
prev = &req->dl_next) {
|
| 407 |
|
|
if (req->rmt_port == rport &&
|
| 408 |
|
|
req->class->family == AF_INET6 &&
|
| 409 |
|
|
!ipv6_addr_cmp(&req->af.v6_req.rmt_addr, raddr) &&
|
| 410 |
|
|
!ipv6_addr_cmp(&req->af.v6_req.loc_addr, laddr) &&
|
| 411 |
|
|
(!req->af.v6_req.iif || req->af.v6_req.iif == iif)) {
|
| 412 |
|
|
BUG_TRAP(req->sk == NULL);
|
| 413 |
|
|
*prevp = prev;
|
| 414 |
|
|
return req;
|
| 415 |
|
|
}
|
| 416 |
|
|
}
|
| 417 |
|
|
|
| 418 |
|
|
return NULL;
|
| 419 |
|
|
}
|
| 420 |
|
|
|
| 421 |
|
|
static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len,
|
| 422 |
|
|
struct in6_addr *saddr,
|
| 423 |
|
|
struct in6_addr *daddr,
|
| 424 |
|
|
unsigned long base)
|
| 425 |
|
|
{
|
| 426 |
|
|
return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
|
| 427 |
|
|
}
|
| 428 |
|
|
|
| 429 |
|
|
static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
|
| 430 |
|
|
{
|
| 431 |
|
|
if (skb->protocol == htons(ETH_P_IPV6)) {
|
| 432 |
|
|
return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
|
| 433 |
|
|
skb->nh.ipv6h->saddr.s6_addr32,
|
| 434 |
|
|
skb->h.th->dest,
|
| 435 |
|
|
skb->h.th->source);
|
| 436 |
|
|
} else {
|
| 437 |
|
|
return secure_tcp_sequence_number(skb->nh.iph->daddr,
|
| 438 |
|
|
skb->nh.iph->saddr,
|
| 439 |
|
|
skb->h.th->dest,
|
| 440 |
|
|
skb->h.th->source);
|
| 441 |
|
|
}
|
| 442 |
|
|
}
|
| 443 |
|
|
|
| 444 |
|
|
static int tcp_v6_check_established(struct sock *sk)
|
| 445 |
|
|
{
|
| 446 |
|
|
struct in6_addr *daddr = &sk->net_pinfo.af_inet6.rcv_saddr;
|
| 447 |
|
|
struct in6_addr *saddr = &sk->net_pinfo.af_inet6.daddr;
|
| 448 |
|
|
int dif = sk->bound_dev_if;
|
| 449 |
|
|
u32 ports = TCP_COMBINED_PORTS(sk->dport, sk->num);
|
| 450 |
|
|
int hash = tcp_v6_hashfn(daddr, sk->num, saddr, sk->dport);
|
| 451 |
|
|
struct tcp_ehash_bucket *head = &tcp_ehash[hash];
|
| 452 |
|
|
struct sock *sk2, **skp;
|
| 453 |
|
|
struct tcp_tw_bucket *tw;
|
| 454 |
|
|
|
| 455 |
|
|
write_lock_bh(&head->lock);
|
| 456 |
|
|
|
| 457 |
|
|
for(skp = &(head + tcp_ehash_size)->chain; (sk2=*skp)!=NULL; skp = &sk2->next) {
|
| 458 |
|
|
tw = (struct tcp_tw_bucket*)sk2;
|
| 459 |
|
|
|
| 460 |
|
|
if(*((__u32 *)&(sk2->dport)) == ports &&
|
| 461 |
|
|
sk2->family == PF_INET6 &&
|
| 462 |
|
|
!ipv6_addr_cmp(&tw->v6_daddr, saddr) &&
|
| 463 |
|
|
!ipv6_addr_cmp(&tw->v6_rcv_saddr, daddr) &&
|
| 464 |
|
|
sk2->bound_dev_if == sk->bound_dev_if) {
|
| 465 |
|
|
struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
|
| 466 |
|
|
|
| 467 |
|
|
if (tw->ts_recent_stamp) {
|
| 468 |
|
|
/* See comment in tcp_ipv4.c */
|
| 469 |
|
|
if ((tp->write_seq = tw->snd_nxt+65535+2) == 0)
|
| 470 |
|
|
tp->write_seq = 1;
|
| 471 |
|
|
tp->ts_recent = tw->ts_recent;
|
| 472 |
|
|
tp->ts_recent_stamp = tw->ts_recent_stamp;
|
| 473 |
|
|
sock_hold(sk2);
|
| 474 |
|
|
skp = &head->chain;
|
| 475 |
|
|
goto unique;
|
| 476 |
|
|
} else
|
| 477 |
|
|
goto not_unique;
|
| 478 |
|
|
}
|
| 479 |
|
|
}
|
| 480 |
|
|
tw = NULL;
|
| 481 |
|
|
|
| 482 |
|
|
for(skp = &head->chain; (sk2=*skp)!=NULL; skp = &sk2->next) {
|
| 483 |
|
|
if(TCP_IPV6_MATCH(sk, saddr, daddr, ports, dif))
|
| 484 |
|
|
goto not_unique;
|
| 485 |
|
|
}
|
| 486 |
|
|
|
| 487 |
|
|
unique:
|
| 488 |
|
|
BUG_TRAP(sk->pprev==NULL);
|
| 489 |
|
|
if ((sk->next = *skp) != NULL)
|
| 490 |
|
|
(*skp)->pprev = &sk->next;
|
| 491 |
|
|
|
| 492 |
|
|
*skp = sk;
|
| 493 |
|
|
sk->pprev = skp;
|
| 494 |
|
|
sk->hashent = hash;
|
| 495 |
|
|
sock_prot_inc_use(sk->prot);
|
| 496 |
|
|
write_unlock_bh(&head->lock);
|
| 497 |
|
|
|
| 498 |
|
|
if (tw) {
|
| 499 |
|
|
/* Silly. Should hash-dance instead... */
|
| 500 |
|
|
local_bh_disable();
|
| 501 |
|
|
tcp_tw_deschedule(tw);
|
| 502 |
|
|
tcp_timewait_kill(tw);
|
| 503 |
|
|
NET_INC_STATS_BH(TimeWaitRecycled);
|
| 504 |
|
|
local_bh_enable();
|
| 505 |
|
|
|
| 506 |
|
|
tcp_tw_put(tw);
|
| 507 |
|
|
}
|
| 508 |
|
|
return 0;
|
| 509 |
|
|
|
| 510 |
|
|
not_unique:
|
| 511 |
|
|
write_unlock_bh(&head->lock);
|
| 512 |
|
|
return -EADDRNOTAVAIL;
|
| 513 |
|
|
}
|
| 514 |
|
|
|
| 515 |
|
|
static int tcp_v6_hash_connect(struct sock *sk)
|
| 516 |
|
|
{
|
| 517 |
|
|
struct tcp_bind_hashbucket *head;
|
| 518 |
|
|
struct tcp_bind_bucket *tb;
|
| 519 |
|
|
|
| 520 |
|
|
/* XXX */
|
| 521 |
|
|
if (sk->num == 0) {
|
| 522 |
|
|
int err = tcp_v6_get_port(sk, sk->num);
|
| 523 |
|
|
if (err)
|
| 524 |
|
|
return err;
|
| 525 |
|
|
sk->sport = htons(sk->num);
|
| 526 |
|
|
}
|
| 527 |
|
|
|
| 528 |
|
|
head = &tcp_bhash[tcp_bhashfn(sk->num)];
|
| 529 |
|
|
tb = head->chain;
|
| 530 |
|
|
|
| 531 |
|
|
spin_lock_bh(&head->lock);
|
| 532 |
|
|
|
| 533 |
|
|
if (tb->owners == sk && sk->bind_next == NULL) {
|
| 534 |
|
|
__tcp_v6_hash(sk);
|
| 535 |
|
|
spin_unlock_bh(&head->lock);
|
| 536 |
|
|
return 0;
|
| 537 |
|
|
} else {
|
| 538 |
|
|
spin_unlock_bh(&head->lock);
|
| 539 |
|
|
return tcp_v6_check_established(sk);
|
| 540 |
|
|
}
|
| 541 |
|
|
}
|
| 542 |
|
|
|
| 543 |
|
|
static __inline__ int tcp_v6_iif(struct sk_buff *skb)
|
| 544 |
|
|
{
|
| 545 |
|
|
struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
|
| 546 |
|
|
return opt->iif;
|
| 547 |
|
|
}
|
| 548 |
|
|
|
| 549 |
|
|
static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
|
| 550 |
|
|
int addr_len)
|
| 551 |
|
|
{
|
| 552 |
|
|
struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
|
| 553 |
|
|
struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
|
| 554 |
|
|
struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
|
| 555 |
|
|
struct in6_addr *saddr = NULL;
|
| 556 |
|
|
struct in6_addr saddr_buf;
|
| 557 |
|
|
struct flowi fl;
|
| 558 |
|
|
struct dst_entry *dst;
|
| 559 |
|
|
int addr_type;
|
| 560 |
|
|
int err;
|
| 561 |
|
|
|
| 562 |
|
|
if (addr_len < SIN6_LEN_RFC2133)
|
| 563 |
|
|
return -EINVAL;
|
| 564 |
|
|
|
| 565 |
|
|
if (usin->sin6_family != AF_INET6)
|
| 566 |
|
|
return(-EAFNOSUPPORT);
|
| 567 |
|
|
|
| 568 |
|
|
fl.fl6_flowlabel = 0;
|
| 569 |
|
|
if (np->sndflow) {
|
| 570 |
|
|
fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
|
| 571 |
|
|
IP6_ECN_flow_init(fl.fl6_flowlabel);
|
| 572 |
|
|
if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
|
| 573 |
|
|
struct ip6_flowlabel *flowlabel;
|
| 574 |
|
|
flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
|
| 575 |
|
|
if (flowlabel == NULL)
|
| 576 |
|
|
return -EINVAL;
|
| 577 |
|
|
ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
|
| 578 |
|
|
fl6_sock_release(flowlabel);
|
| 579 |
|
|
}
|
| 580 |
|
|
}
|
| 581 |
|
|
|
| 582 |
|
|
/*
|
| 583 |
|
|
* connect() to INADDR_ANY means loopback (BSD'ism).
|
| 584 |
|
|
*/
|
| 585 |
|
|
|
| 586 |
|
|
if(ipv6_addr_any(&usin->sin6_addr))
|
| 587 |
|
|
usin->sin6_addr.s6_addr[15] = 0x1;
|
| 588 |
|
|
|
| 589 |
|
|
addr_type = ipv6_addr_type(&usin->sin6_addr);
|
| 590 |
|
|
|
| 591 |
|
|
if(addr_type & IPV6_ADDR_MULTICAST)
|
| 592 |
|
|
return -ENETUNREACH;
|
| 593 |
|
|
|
| 594 |
|
|
if (addr_type&IPV6_ADDR_LINKLOCAL) {
|
| 595 |
|
|
if (addr_len >= sizeof(struct sockaddr_in6) &&
|
| 596 |
|
|
usin->sin6_scope_id) {
|
| 597 |
|
|
/* If interface is set while binding, indices
|
| 598 |
|
|
* must coincide.
|
| 599 |
|
|
*/
|
| 600 |
|
|
if (sk->bound_dev_if &&
|
| 601 |
|
|
sk->bound_dev_if != usin->sin6_scope_id)
|
| 602 |
|
|
return -EINVAL;
|
| 603 |
|
|
|
| 604 |
|
|
sk->bound_dev_if = usin->sin6_scope_id;
|
| 605 |
|
|
}
|
| 606 |
|
|
|
| 607 |
|
|
/* Connect to link-local address requires an interface */
|
| 608 |
|
|
if (sk->bound_dev_if == 0)
|
| 609 |
|
|
return -EINVAL;
|
| 610 |
|
|
}
|
| 611 |
|
|
|
| 612 |
|
|
if (tp->ts_recent_stamp && ipv6_addr_cmp(&np->daddr, &usin->sin6_addr)) {
|
| 613 |
|
|
tp->ts_recent = 0;
|
| 614 |
|
|
tp->ts_recent_stamp = 0;
|
| 615 |
|
|
tp->write_seq = 0;
|
| 616 |
|
|
}
|
| 617 |
|
|
|
| 618 |
|
|
ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
|
| 619 |
|
|
np->flow_label = fl.fl6_flowlabel;
|
| 620 |
|
|
|
| 621 |
|
|
/*
|
| 622 |
|
|
* TCP over IPv4
|
| 623 |
|
|
*/
|
| 624 |
|
|
|
| 625 |
|
|
if (addr_type == IPV6_ADDR_MAPPED) {
|
| 626 |
|
|
u32 exthdrlen = tp->ext_header_len;
|
| 627 |
|
|
struct sockaddr_in sin;
|
| 628 |
|
|
|
| 629 |
|
|
SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
|
| 630 |
|
|
|
| 631 |
|
|
if (__ipv6_only_sock(sk))
|
| 632 |
|
|
return -ENETUNREACH;
|
| 633 |
|
|
|
| 634 |
|
|
sin.sin_family = AF_INET;
|
| 635 |
|
|
sin.sin_port = usin->sin6_port;
|
| 636 |
|
|
sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
|
| 637 |
|
|
|
| 638 |
|
|
sk->tp_pinfo.af_tcp.af_specific = &ipv6_mapped;
|
| 639 |
|
|
sk->backlog_rcv = tcp_v4_do_rcv;
|
| 640 |
|
|
|
| 641 |
|
|
err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
|
| 642 |
|
|
|
| 643 |
|
|
if (err) {
|
| 644 |
|
|
tp->ext_header_len = exthdrlen;
|
| 645 |
|
|
sk->tp_pinfo.af_tcp.af_specific = &ipv6_specific;
|
| 646 |
|
|
sk->backlog_rcv = tcp_v6_do_rcv;
|
| 647 |
|
|
goto failure;
|
| 648 |
|
|
} else {
|
| 649 |
|
|
ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
|
| 650 |
|
|
sk->saddr);
|
| 651 |
|
|
ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
|
| 652 |
|
|
sk->rcv_saddr);
|
| 653 |
|
|
}
|
| 654 |
|
|
|
| 655 |
|
|
return err;
|
| 656 |
|
|
}
|
| 657 |
|
|
|
| 658 |
|
|
if (!ipv6_addr_any(&np->rcv_saddr))
|
| 659 |
|
|
saddr = &np->rcv_saddr;
|
| 660 |
|
|
|
| 661 |
|
|
fl.proto = IPPROTO_TCP;
|
| 662 |
|
|
fl.fl6_dst = &np->daddr;
|
| 663 |
|
|
fl.fl6_src = saddr;
|
| 664 |
|
|
fl.oif = sk->bound_dev_if;
|
| 665 |
|
|
fl.uli_u.ports.dport = usin->sin6_port;
|
| 666 |
|
|
fl.uli_u.ports.sport = sk->sport;
|
| 667 |
|
|
|
| 668 |
|
|
if (np->opt && np->opt->srcrt) {
|
| 669 |
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
|
| 670 |
|
|
fl.nl_u.ip6_u.daddr = rt0->addr;
|
| 671 |
|
|
}
|
| 672 |
|
|
|
| 673 |
|
|
dst = ip6_route_output(sk, &fl);
|
| 674 |
|
|
|
| 675 |
|
|
if ((err = dst->error) != 0) {
|
| 676 |
|
|
dst_release(dst);
|
| 677 |
|
|
goto failure;
|
| 678 |
|
|
}
|
| 679 |
|
|
|
| 680 |
|
|
ip6_dst_store(sk, dst, NULL);
|
| 681 |
|
|
sk->route_caps = dst->dev->features&~NETIF_F_IP_CSUM;
|
| 682 |
|
|
|
| 683 |
|
|
if (saddr == NULL) {
|
| 684 |
|
|
err = ipv6_get_saddr(dst, &np->daddr, &saddr_buf);
|
| 685 |
|
|
if (err)
|
| 686 |
|
|
goto failure;
|
| 687 |
|
|
|
| 688 |
|
|
saddr = &saddr_buf;
|
| 689 |
|
|
}
|
| 690 |
|
|
|
| 691 |
|
|
/* set the source address */
|
| 692 |
|
|
ipv6_addr_copy(&np->rcv_saddr, saddr);
|
| 693 |
|
|
ipv6_addr_copy(&np->saddr, saddr);
|
| 694 |
|
|
sk->rcv_saddr= LOOPBACK4_IPV6;
|
| 695 |
|
|
|
| 696 |
|
|
tp->ext_header_len = 0;
|
| 697 |
|
|
if (np->opt)
|
| 698 |
|
|
tp->ext_header_len = np->opt->opt_flen+np->opt->opt_nflen;
|
| 699 |
|
|
tp->mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
|
| 700 |
|
|
|
| 701 |
|
|
sk->dport = usin->sin6_port;
|
| 702 |
|
|
|
| 703 |
|
|
tcp_set_state(sk, TCP_SYN_SENT);
|
| 704 |
|
|
err = tcp_v6_hash_connect(sk);
|
| 705 |
|
|
if (err)
|
| 706 |
|
|
goto late_failure;
|
| 707 |
|
|
|
| 708 |
|
|
if (!tp->write_seq)
|
| 709 |
|
|
tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
|
| 710 |
|
|
np->daddr.s6_addr32,
|
| 711 |
|
|
sk->sport, sk->dport);
|
| 712 |
|
|
err = tcp_connect(sk);
|
| 713 |
|
|
if (err)
|
| 714 |
|
|
goto late_failure;
|
| 715 |
|
|
|
| 716 |
|
|
return 0;
|
| 717 |
|
|
|
| 718 |
|
|
late_failure:
|
| 719 |
|
|
tcp_set_state(sk, TCP_CLOSE);
|
| 720 |
|
|
failure:
|
| 721 |
|
|
__sk_dst_reset(sk);
|
| 722 |
|
|
sk->dport = 0;
|
| 723 |
|
|
sk->route_caps = 0;
|
| 724 |
|
|
return err;
|
| 725 |
|
|
}
|
| 726 |
|
|
|
| 727 |
|
|
void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
| 728 |
|
|
int type, int code, int offset, __u32 info)
|
| 729 |
|
|
{
|
| 730 |
|
|
struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
|
| 731 |
|
|
struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
|
| 732 |
|
|
struct ipv6_pinfo *np;
|
| 733 |
|
|
struct sock *sk;
|
| 734 |
|
|
int err;
|
| 735 |
|
|
struct tcp_opt *tp;
|
| 736 |
|
|
__u32 seq;
|
| 737 |
|
|
|
| 738 |
|
|
sk = tcp_v6_lookup(&hdr->daddr, th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
|
| 739 |
|
|
|
| 740 |
|
|
if (sk == NULL) {
|
| 741 |
|
|
ICMP6_INC_STATS_BH(Icmp6InErrors);
|
| 742 |
|
|
return;
|
| 743 |
|
|
}
|
| 744 |
|
|
|
| 745 |
|
|
if (sk->state == TCP_TIME_WAIT) {
|
| 746 |
|
|
tcp_tw_put((struct tcp_tw_bucket*)sk);
|
| 747 |
|
|
return;
|
| 748 |
|
|
}
|
| 749 |
|
|
|
| 750 |
|
|
bh_lock_sock(sk);
|
| 751 |
|
|
if (sk->lock.users)
|
| 752 |
|
|
NET_INC_STATS_BH(LockDroppedIcmps);
|
| 753 |
|
|
|
| 754 |
|
|
if (sk->state == TCP_CLOSE)
|
| 755 |
|
|
goto out;
|
| 756 |
|
|
|
| 757 |
|
|
tp = &sk->tp_pinfo.af_tcp;
|
| 758 |
|
|
seq = ntohl(th->seq);
|
| 759 |
|
|
if (sk->state != TCP_LISTEN && !between(seq, tp->snd_una, tp->snd_nxt)) {
|
| 760 |
|
|
NET_INC_STATS_BH(OutOfWindowIcmps);
|
| 761 |
|
|
goto out;
|
| 762 |
|
|
}
|
| 763 |
|
|
|
| 764 |
|
|
np = &sk->net_pinfo.af_inet6;
|
| 765 |
|
|
|
| 766 |
|
|
if (type == ICMPV6_PKT_TOOBIG) {
|
| 767 |
|
|
struct dst_entry *dst = NULL;
|
| 768 |
|
|
|
| 769 |
|
|
if (sk->lock.users)
|
| 770 |
|
|
goto out;
|
| 771 |
|
|
if ((1<<sk->state)&(TCPF_LISTEN|TCPF_CLOSE))
|
| 772 |
|
|
goto out;
|
| 773 |
|
|
|
| 774 |
|
|
/* icmp should have updated the destination cache entry */
|
| 775 |
|
|
dst = __sk_dst_check(sk, np->dst_cookie);
|
| 776 |
|
|
|
| 777 |
|
|
if (dst == NULL) {
|
| 778 |
|
|
struct flowi fl;
|
| 779 |
|
|
|
| 780 |
|
|
/* BUGGG_FUTURE: Again, it is not clear how
|
| 781 |
|
|
to handle rthdr case. Ignore this complexity
|
| 782 |
|
|
for now.
|
| 783 |
|
|
*/
|
| 784 |
|
|
fl.proto = IPPROTO_TCP;
|
| 785 |
|
|
fl.nl_u.ip6_u.daddr = &np->daddr;
|
| 786 |
|
|
fl.nl_u.ip6_u.saddr = &np->saddr;
|
| 787 |
|
|
fl.oif = sk->bound_dev_if;
|
| 788 |
|
|
fl.uli_u.ports.dport = sk->dport;
|
| 789 |
|
|
fl.uli_u.ports.sport = sk->sport;
|
| 790 |
|
|
|
| 791 |
|
|
dst = ip6_route_output(sk, &fl);
|
| 792 |
|
|
} else
|
| 793 |
|
|
dst_hold(dst);
|
| 794 |
|
|
|
| 795 |
|
|
if (dst->error) {
|
| 796 |
|
|
sk->err_soft = -dst->error;
|
| 797 |
|
|
} else if (tp->pmtu_cookie > dst->pmtu) {
|
| 798 |
|
|
tcp_sync_mss(sk, dst->pmtu);
|
| 799 |
|
|
tcp_simple_retransmit(sk);
|
| 800 |
|
|
} /* else let the usual retransmit timer handle it */
|
| 801 |
|
|
dst_release(dst);
|
| 802 |
|
|
goto out;
|
| 803 |
|
|
}
|
| 804 |
|
|
|
| 805 |
|
|
icmpv6_err_convert(type, code, &err);
|
| 806 |
|
|
|
| 807 |
|
|
/* Might be for an open_request */
|
| 808 |
|
|
switch (sk->state) {
|
| 809 |
|
|
struct open_request *req, **prev;
|
| 810 |
|
|
case TCP_LISTEN:
|
| 811 |
|
|
if (sk->lock.users)
|
| 812 |
|
|
goto out;
|
| 813 |
|
|
|
| 814 |
|
|
req = tcp_v6_search_req(tp, &prev, th->dest, &hdr->daddr,
|
| 815 |
|
|
&hdr->saddr, tcp_v6_iif(skb));
|
| 816 |
|
|
if (!req)
|
| 817 |
|
|
goto out;
|
| 818 |
|
|
|
| 819 |
|
|
/* ICMPs are not backlogged, hence we cannot get
|
| 820 |
|
|
* an established socket here.
|
| 821 |
|
|
*/
|
| 822 |
|
|
BUG_TRAP(req->sk == NULL);
|
| 823 |
|
|
|
| 824 |
|
|
if (seq != req->snt_isn) {
|
| 825 |
|
|
NET_INC_STATS_BH(OutOfWindowIcmps);
|
| 826 |
|
|
goto out;
|
| 827 |
|
|
}
|
| 828 |
|
|
|
| 829 |
|
|
tcp_synq_drop(sk, req, prev);
|
| 830 |
|
|
goto out;
|
| 831 |
|
|
|
| 832 |
|
|
case TCP_SYN_SENT:
|
| 833 |
|
|
case TCP_SYN_RECV: /* Cannot happen.
|
| 834 |
|
|
It can, it SYNs are crossed. --ANK */
|
| 835 |
|
|
if (sk->lock.users == 0) {
|
| 836 |
|
|
TCP_INC_STATS_BH(TcpAttemptFails);
|
| 837 |
|
|
sk->err = err;
|
| 838 |
|
|
sk->error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
|
| 839 |
|
|
|
| 840 |
|
|
tcp_done(sk);
|
| 841 |
|
|
} else {
|
| 842 |
|
|
sk->err_soft = err;
|
| 843 |
|
|
}
|
| 844 |
|
|
goto out;
|
| 845 |
|
|
}
|
| 846 |
|
|
|
| 847 |
|
|
if (sk->lock.users == 0 && np->recverr) {
|
| 848 |
|
|
sk->err = err;
|
| 849 |
|
|
sk->error_report(sk);
|
| 850 |
|
|
} else {
|
| 851 |
|
|
sk->err_soft = err;
|
| 852 |
|
|
}
|
| 853 |
|
|
|
| 854 |
|
|
out:
|
| 855 |
|
|
bh_unlock_sock(sk);
|
| 856 |
|
|
sock_put(sk);
|
| 857 |
|
|
}
|
| 858 |
|
|
|
| 859 |
|
|
|
| 860 |
|
|
static int tcp_v6_send_synack(struct sock *sk, struct open_request *req,
|
| 861 |
|
|
struct dst_entry *dst)
|
| 862 |
|
|
{
|
| 863 |
|
|
struct sk_buff * skb;
|
| 864 |
|
|
struct ipv6_txoptions *opt = NULL;
|
| 865 |
|
|
struct flowi fl;
|
| 866 |
|
|
int err = -1;
|
| 867 |
|
|
|
| 868 |
|
|
fl.proto = IPPROTO_TCP;
|
| 869 |
|
|
fl.nl_u.ip6_u.daddr = &req->af.v6_req.rmt_addr;
|
| 870 |
|
|
fl.nl_u.ip6_u.saddr = &req->af.v6_req.loc_addr;
|
| 871 |
|
|
fl.fl6_flowlabel = 0;
|
| 872 |
|
|
fl.oif = req->af.v6_req.iif;
|
| 873 |
|
|
fl.uli_u.ports.dport = req->rmt_port;
|
| 874 |
|
|
fl.uli_u.ports.sport = sk->sport;
|
| 875 |
|
|
|
| 876 |
|
|
if (dst == NULL) {
|
| 877 |
|
|
opt = sk->net_pinfo.af_inet6.opt;
|
| 878 |
|
|
if (opt == NULL &&
|
| 879 |
|
|
sk->net_pinfo.af_inet6.rxopt.bits.srcrt == 2 &&
|
| 880 |
|
|
req->af.v6_req.pktopts) {
|
| 881 |
|
|
struct sk_buff *pktopts = req->af.v6_req.pktopts;
|
| 882 |
|
|
struct inet6_skb_parm *rxopt = (struct inet6_skb_parm *)pktopts->cb;
|
| 883 |
|
|
if (rxopt->srcrt)
|
| 884 |
|
|
opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt));
|
| 885 |
|
|
}
|
| 886 |
|
|
|
| 887 |
|
|
if (opt && opt->srcrt) {
|
| 888 |
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
|
| 889 |
|
|
fl.nl_u.ip6_u.daddr = rt0->addr;
|
| 890 |
|
|
}
|
| 891 |
|
|
|
| 892 |
|
|
dst = ip6_route_output(sk, &fl);
|
| 893 |
|
|
if (dst->error)
|
| 894 |
|
|
goto done;
|
| 895 |
|
|
}
|
| 896 |
|
|
|
| 897 |
|
|
skb = tcp_make_synack(sk, dst, req);
|
| 898 |
|
|
if (skb) {
|
| 899 |
|
|
struct tcphdr *th = skb->h.th;
|
| 900 |
|
|
|
| 901 |
|
|
th->check = tcp_v6_check(th, skb->len,
|
| 902 |
|
|
&req->af.v6_req.loc_addr, &req->af.v6_req.rmt_addr,
|
| 903 |
|
|
csum_partial((char *)th, skb->len, skb->csum));
|
| 904 |
|
|
|
| 905 |
|
|
fl.nl_u.ip6_u.daddr = &req->af.v6_req.rmt_addr;
|
| 906 |
|
|
err = ip6_xmit(sk, skb, &fl, opt);
|
| 907 |
|
|
if (err == NET_XMIT_CN)
|
| 908 |
|
|
err = 0;
|
| 909 |
|
|
}
|
| 910 |
|
|
|
| 911 |
|
|
done:
|
| 912 |
|
|
dst_release(dst);
|
| 913 |
|
|
if (opt && opt != sk->net_pinfo.af_inet6.opt)
|
| 914 |
|
|
sock_kfree_s(sk, opt, opt->tot_len);
|
| 915 |
|
|
return err;
|
| 916 |
|
|
}
|
| 917 |
|
|
|
| 918 |
|
|
static void tcp_v6_or_free(struct open_request *req)
|
| 919 |
|
|
{
|
| 920 |
|
|
if (req->af.v6_req.pktopts)
|
| 921 |
|
|
kfree_skb(req->af.v6_req.pktopts);
|
| 922 |
|
|
}
|
| 923 |
|
|
|
| 924 |
|
|
static struct or_calltable or_ipv6 = {
|
| 925 |
|
|
AF_INET6,
|
| 926 |
|
|
tcp_v6_send_synack,
|
| 927 |
|
|
tcp_v6_or_send_ack,
|
| 928 |
|
|
tcp_v6_or_free,
|
| 929 |
|
|
tcp_v6_send_reset
|
| 930 |
|
|
};
|
| 931 |
|
|
|
| 932 |
|
|
static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
|
| 933 |
|
|
{
|
| 934 |
|
|
struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb;
|
| 935 |
|
|
|
| 936 |
|
|
if (sk->net_pinfo.af_inet6.rxopt.all) {
|
| 937 |
|
|
if ((opt->hop && sk->net_pinfo.af_inet6.rxopt.bits.hopopts) ||
|
| 938 |
|
|
((IPV6_FLOWINFO_MASK&*(u32*)skb->nh.raw) &&
|
| 939 |
|
|
sk->net_pinfo.af_inet6.rxopt.bits.rxflow) ||
|
| 940 |
|
|
(opt->srcrt && sk->net_pinfo.af_inet6.rxopt.bits.srcrt) ||
|
| 941 |
|
|
((opt->dst1 || opt->dst0) && sk->net_pinfo.af_inet6.rxopt.bits.dstopts))
|
| 942 |
|
|
return 1;
|
| 943 |
|
|
}
|
| 944 |
|
|
return 0;
|
| 945 |
|
|
}
|
| 946 |
|
|
|
| 947 |
|
|
|
| 948 |
|
|
static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len,
|
| 949 |
|
|
struct sk_buff *skb)
|
| 950 |
|
|
{
|
| 951 |
|
|
struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
|
| 952 |
|
|
|
| 953 |
|
|
if (skb->ip_summed == CHECKSUM_HW) {
|
| 954 |
|
|
th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
|
| 955 |
|
|
skb->csum = offsetof(struct tcphdr, check);
|
| 956 |
|
|
} else {
|
| 957 |
|
|
th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
|
| 958 |
|
|
csum_partial((char *)th, th->doff<<2,
|
| 959 |
|
|
skb->csum));
|
| 960 |
|
|
}
|
| 961 |
|
|
}
|
| 962 |
|
|
|
| 963 |
|
|
|
| 964 |
|
|
static void tcp_v6_send_reset(struct sk_buff *skb)
|
| 965 |
|
|
{
|
| 966 |
|
|
struct tcphdr *th = skb->h.th, *t1;
|
| 967 |
|
|
struct sk_buff *buff;
|
| 968 |
|
|
struct flowi fl;
|
| 969 |
|
|
|
| 970 |
|
|
if (th->rst)
|
| 971 |
|
|
return;
|
| 972 |
|
|
|
| 973 |
|
|
if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr))
|
| 974 |
|
|
return;
|
| 975 |
|
|
|
| 976 |
|
|
/*
|
| 977 |
|
|
* We need to grab some memory, and put together an RST,
|
| 978 |
|
|
* and then put it into the queue to be sent.
|
| 979 |
|
|
*/
|
| 980 |
|
|
|
| 981 |
|
|
buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr), GFP_ATOMIC);
|
| 982 |
|
|
if (buff == NULL)
|
| 983 |
|
|
return;
|
| 984 |
|
|
|
| 985 |
|
|
skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr));
|
| 986 |
|
|
|
| 987 |
|
|
t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr));
|
| 988 |
|
|
|
| 989 |
|
|
/* Swap the send and the receive. */
|
| 990 |
|
|
memset(t1, 0, sizeof(*t1));
|
| 991 |
|
|
t1->dest = th->source;
|
| 992 |
|
|
t1->source = th->dest;
|
| 993 |
|
|
t1->doff = sizeof(*t1)/4;
|
| 994 |
|
|
t1->rst = 1;
|
| 995 |
|
|
|
| 996 |
|
|
if(th->ack) {
|
| 997 |
|
|
t1->seq = th->ack_seq;
|
| 998 |
|
|
} else {
|
| 999 |
|
|
t1->ack = 1;
|
| 1000 |
|
|
t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
|
| 1001 |
|
|
+ skb->len - (th->doff<<2));
|
| 1002 |
|
|
}
|
| 1003 |
|
|
|
| 1004 |
|
|
buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
|
| 1005 |
|
|
|
| 1006 |
|
|
fl.nl_u.ip6_u.daddr = &skb->nh.ipv6h->saddr;
|
| 1007 |
|
|
fl.nl_u.ip6_u.saddr = &skb->nh.ipv6h->daddr;
|
| 1008 |
|
|
fl.fl6_flowlabel = 0;
|
| 1009 |
|
|
|
| 1010 |
|
|
t1->check = csum_ipv6_magic(fl.nl_u.ip6_u.saddr,
|
| 1011 |
|
|
fl.nl_u.ip6_u.daddr,
|
| 1012 |
|
|
sizeof(*t1), IPPROTO_TCP,
|
| 1013 |
|
|
buff->csum);
|
| 1014 |
|
|
|
| 1015 |
|
|
fl.proto = IPPROTO_TCP;
|
| 1016 |
|
|
fl.oif = tcp_v6_iif(skb);
|
| 1017 |
|
|
fl.uli_u.ports.dport = t1->dest;
|
| 1018 |
|
|
fl.uli_u.ports.sport = t1->source;
|
| 1019 |
|
|
|
| 1020 |
|
|
/* sk = NULL, but it is safe for now. RST socket required. */
|
| 1021 |
|
|
buff->dst = ip6_route_output(NULL, &fl);
|
| 1022 |
|
|
|
| 1023 |
|
|
if (buff->dst->error == 0) {
|
| 1024 |
|
|
ip6_xmit(NULL, buff, &fl, NULL);
|
| 1025 |
|
|
TCP_INC_STATS_BH(TcpOutSegs);
|
| 1026 |
|
|
TCP_INC_STATS_BH(TcpOutRsts);
|
| 1027 |
|
|
return;
|
| 1028 |
|
|
}
|
| 1029 |
|
|
|
| 1030 |
|
|
kfree_skb(buff);
|
| 1031 |
|
|
}
|
| 1032 |
|
|
|
| 1033 |
|
|
static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
|
| 1034 |
|
|
{
|
| 1035 |
|
|
struct tcphdr *th = skb->h.th, *t1;
|
| 1036 |
|
|
struct sk_buff *buff;
|
| 1037 |
|
|
struct flowi fl;
|
| 1038 |
|
|
int tot_len = sizeof(struct tcphdr);
|
| 1039 |
|
|
|
| 1040 |
|
|
buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr), GFP_ATOMIC);
|
| 1041 |
|
|
if (buff == NULL)
|
| 1042 |
|
|
return;
|
| 1043 |
|
|
|
| 1044 |
|
|
skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr));
|
| 1045 |
|
|
|
| 1046 |
|
|
if (ts)
|
| 1047 |
|
|
tot_len += 3*4;
|
| 1048 |
|
|
|
| 1049 |
|
|
t1 = (struct tcphdr *) skb_push(buff,tot_len);
|
| 1050 |
|
|
|
| 1051 |
|
|
/* Swap the send and the receive. */
|
| 1052 |
|
|
memset(t1, 0, sizeof(*t1));
|
| 1053 |
|
|
t1->dest = th->source;
|
| 1054 |
|
|
t1->source = th->dest;
|
| 1055 |
|
|
t1->doff = tot_len/4;
|
| 1056 |
|
|
t1->seq = htonl(seq);
|
| 1057 |
|
|
t1->ack_seq = htonl(ack);
|
| 1058 |
|
|
t1->ack = 1;
|
| 1059 |
|
|
t1->window = htons(win);
|
| 1060 |
|
|
|
| 1061 |
|
|
if (ts) {
|
| 1062 |
|
|
u32 *ptr = (u32*)(t1 + 1);
|
| 1063 |
|
|
*ptr++ = htonl((TCPOPT_NOP << 24) |
|
| 1064 |
|
|
(TCPOPT_NOP << 16) |
|
| 1065 |
|
|
(TCPOPT_TIMESTAMP << 8) |
|
| 1066 |
|
|
TCPOLEN_TIMESTAMP);
|
| 1067 |
|
|
*ptr++ = htonl(tcp_time_stamp);
|
| 1068 |
|
|
*ptr = htonl(ts);
|
| 1069 |
|
|
}
|
| 1070 |
|
|
|
| 1071 |
|
|
buff->csum = csum_partial((char *)t1, tot_len, 0);
|
| 1072 |
|
|
|
| 1073 |
|
|
fl.nl_u.ip6_u.daddr = &skb->nh.ipv6h->saddr;
|
| 1074 |
|
|
fl.nl_u.ip6_u.saddr = &skb->nh.ipv6h->daddr;
|
| 1075 |
|
|
fl.fl6_flowlabel = 0;
|
| 1076 |
|
|
|
| 1077 |
|
|
t1->check = csum_ipv6_magic(fl.nl_u.ip6_u.saddr,
|
| 1078 |
|
|
fl.nl_u.ip6_u.daddr,
|
| 1079 |
|
|
tot_len, IPPROTO_TCP,
|
| 1080 |
|
|
buff->csum);
|
| 1081 |
|
|
|
| 1082 |
|
|
fl.proto = IPPROTO_TCP;
|
| 1083 |
|
|
fl.oif = tcp_v6_iif(skb);
|
| 1084 |
|
|
fl.uli_u.ports.dport = t1->dest;
|
| 1085 |
|
|
fl.uli_u.ports.sport = t1->source;
|
| 1086 |
|
|
|
| 1087 |
|
|
buff->dst = ip6_route_output(NULL, &fl);
|
| 1088 |
|
|
|
| 1089 |
|
|
if (buff->dst->error == 0) {
|
| 1090 |
|
|
ip6_xmit(NULL, buff, &fl, NULL);
|
| 1091 |
|
|
TCP_INC_STATS_BH(TcpOutSegs);
|
| 1092 |
|
|
return;
|
| 1093 |
|
|
}
|
| 1094 |
|
|
|
| 1095 |
|
|
kfree_skb(buff);
|
| 1096 |
|
|
}
|
| 1097 |
|
|
|
| 1098 |
|
|
static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
|
| 1099 |
|
|
{
|
| 1100 |
|
|
struct tcp_tw_bucket *tw = (struct tcp_tw_bucket *)sk;
|
| 1101 |
|
|
|
| 1102 |
|
|
tcp_v6_send_ack(skb, tw->snd_nxt, tw->rcv_nxt,
|
| 1103 |
|
|
tw->rcv_wnd>>tw->rcv_wscale, tw->ts_recent);
|
| 1104 |
|
|
|
| 1105 |
|
|
tcp_tw_put(tw);
|
| 1106 |
|
|
}
|
| 1107 |
|
|
|
| 1108 |
|
|
static void tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req)
|
| 1109 |
|
|
{
|
| 1110 |
|
|
tcp_v6_send_ack(skb, req->snt_isn+1, req->rcv_isn+1, req->rcv_wnd, req->ts_recent);
|
| 1111 |
|
|
}
|
| 1112 |
|
|
|
| 1113 |
|
|
|
| 1114 |
|
|
static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
|
| 1115 |
|
|
{
|
| 1116 |
|
|
struct open_request *req, **prev;
|
| 1117 |
|
|
struct tcphdr *th = skb->h.th;
|
| 1118 |
|
|
struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
|
| 1119 |
|
|
struct sock *nsk;
|
| 1120 |
|
|
|
| 1121 |
|
|
/* Find possible connection requests. */
|
| 1122 |
|
|
req = tcp_v6_search_req(tp, &prev, th->source, &skb->nh.ipv6h->saddr,
|
| 1123 |
|
|
&skb->nh.ipv6h->daddr, tcp_v6_iif(skb));
|
| 1124 |
|
|
if (req)
|
| 1125 |
|
|
return tcp_check_req(sk, skb, req, prev);
|
| 1126 |
|
|
|
| 1127 |
|
|
nsk = __tcp_v6_lookup_established(&skb->nh.ipv6h->saddr,
|
| 1128 |
|
|
th->source,
|
| 1129 |
|
|
&skb->nh.ipv6h->daddr,
|
| 1130 |
|
|
ntohs(th->dest),
|
| 1131 |
|
|
tcp_v6_iif(skb));
|
| 1132 |
|
|
|
| 1133 |
|
|
if (nsk) {
|
| 1134 |
|
|
if (nsk->state != TCP_TIME_WAIT) {
|
| 1135 |
|
|
bh_lock_sock(nsk);
|
| 1136 |
|
|
return nsk;
|
| 1137 |
|
|
}
|
| 1138 |
|
|
tcp_tw_put((struct tcp_tw_bucket*)nsk);
|
| 1139 |
|
|
return NULL;
|
| 1140 |
|
|
}
|
| 1141 |
|
|
|
| 1142 |
|
|
#if 0 /*def CONFIG_SYN_COOKIES*/
|
| 1143 |
|
|
if (!th->rst && !th->syn && th->ack)
|
| 1144 |
|
|
sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
|
| 1145 |
|
|
#endif
|
| 1146 |
|
|
return sk;
|
| 1147 |
|
|
}
|
| 1148 |
|
|
|
| 1149 |
|
|
static void tcp_v6_synq_add(struct sock *sk, struct open_request *req)
|
| 1150 |
|
|
{
|
| 1151 |
|
|
struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
|
| 1152 |
|
|
struct tcp_listen_opt *lopt = tp->listen_opt;
|
| 1153 |
|
|
u32 h = tcp_v6_synq_hash(&req->af.v6_req.rmt_addr, req->rmt_port, lopt->hash_rnd);
|
| 1154 |
|
|
|
| 1155 |
|
|
req->sk = NULL;
|
| 1156 |
|
|
req->expires = jiffies + TCP_TIMEOUT_INIT;
|
| 1157 |
|
|
req->retrans = 0;
|
| 1158 |
|
|
req->dl_next = lopt->syn_table[h];
|
| 1159 |
|
|
|
| 1160 |
|
|
write_lock(&tp->syn_wait_lock);
|
| 1161 |
|
|
lopt->syn_table[h] = req;
|
| 1162 |
|
|
write_unlock(&tp->syn_wait_lock);
|
| 1163 |
|
|
|
| 1164 |
|
|
tcp_synq_added(sk);
|
| 1165 |
|
|
}
|
| 1166 |
|
|
|
| 1167 |
|
|
|
| 1168 |
|
|
/* FIXME: this is substantially similar to the ipv4 code.
|
| 1169 |
|
|
* Can some kind of merge be done? -- erics
|
| 1170 |
|
|
*/
|
| 1171 |
|
|
static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
|
| 1172 |
|
|
{
|
| 1173 |
|
|
struct tcp_opt tp;
|
| 1174 |
|
|
struct open_request *req = NULL;
|
| 1175 |
|
|
__u32 isn = TCP_SKB_CB(skb)->when;
|
| 1176 |
|
|
|
| 1177 |
|
|
if (skb->protocol == htons(ETH_P_IP))
|
| 1178 |
|
|
return tcp_v4_conn_request(sk, skb);
|
| 1179 |
|
|
|
| 1180 |
|
|
/* FIXME: do the same check for anycast */
|
| 1181 |
|
|
if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr))
|
| 1182 |
|
|
goto drop;
|
| 1183 |
|
|
|
| 1184 |
|
|
/*
|
| 1185 |
|
|
* There are no SYN attacks on IPv6, yet...
|
| 1186 |
|
|
*/
|
| 1187 |
|
|
if (tcp_synq_is_full(sk) && !isn) {
|
| 1188 |
|
|
if (net_ratelimit())
|
| 1189 |
|
|
printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n");
|
| 1190 |
|
|
goto drop;
|
| 1191 |
|
|
}
|
| 1192 |
|
|
|
| 1193 |
|
|
if (tcp_acceptq_is_full(sk) && tcp_synq_young(sk) > 1)
|
| 1194 |
|
|
goto drop;
|
| 1195 |
|
|
|
| 1196 |
|
|
req = tcp_openreq_alloc();
|
| 1197 |
|
|
if (req == NULL)
|
| 1198 |
|
|
goto drop;
|
| 1199 |
|
|
|
| 1200 |
|
|
tcp_clear_options(&tp);
|
| 1201 |
|
|
tp.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
|
| 1202 |
|
|
tp.user_mss = sk->tp_pinfo.af_tcp.user_mss;
|
| 1203 |
|
|
|
| 1204 |
|
|
tcp_parse_options(skb, &tp, 0);
|
| 1205 |
|
|
|
| 1206 |
|
|
tp.tstamp_ok = tp.saw_tstamp;
|
| 1207 |
|
|
tcp_openreq_init(req, &tp, skb);
|
| 1208 |
|
|
|
| 1209 |
|
|
req->class = &or_ipv6;
|
| 1210 |
|
|
ipv6_addr_copy(&req->af.v6_req.rmt_addr, &skb->nh.ipv6h->saddr);
|
| 1211 |
|
|
ipv6_addr_copy(&req->af.v6_req.loc_addr, &skb->nh.ipv6h->daddr);
|
| 1212 |
|
|
TCP_ECN_create_request(req, skb->h.th);
|
| 1213 |
|
|
req->af.v6_req.pktopts = NULL;
|
| 1214 |
|
|
if (ipv6_opt_accepted(sk, skb) ||
|
| 1215 |
|
|
sk->net_pinfo.af_inet6.rxopt.bits.rxinfo ||
|
| 1216 |
|
|
sk->net_pinfo.af_inet6.rxopt.bits.rxhlim) {
|
| 1217 |
|
|
atomic_inc(&skb->users);
|
| 1218 |
|
|
req->af.v6_req.pktopts = skb;
|
| 1219 |
|
|
}
|
| 1220 |
|
|
req->af.v6_req.iif = sk->bound_dev_if;
|
| 1221 |
|
|
|
| 1222 |
|
|
/* So that link locals have meaning */
|
| 1223 |
|
|
if (!sk->bound_dev_if && ipv6_addr_type(&req->af.v6_req.rmt_addr)&IPV6_ADDR_LINKLOCAL)
|
| 1224 |
|
|
req->af.v6_req.iif = tcp_v6_iif(skb);
|
| 1225 |
|
|
|
| 1226 |
|
|
if (isn == 0)
|
| 1227 |
|
|
isn = tcp_v6_init_sequence(sk,skb);
|
| 1228 |
|
|
|
| 1229 |
|
|
req->snt_isn = isn;
|
| 1230 |
|
|
|
| 1231 |
|
|
if (tcp_v6_send_synack(sk, req, NULL))
|
| 1232 |
|
|
goto drop;
|
| 1233 |
|
|
|
| 1234 |
|
|
tcp_v6_synq_add(sk, req);
|
| 1235 |
|
|
|
| 1236 |
|
|
return 0;
|
| 1237 |
|
|
|
| 1238 |
|
|
drop:
|
| 1239 |
|
|
if (req)
|
| 1240 |
|
|
tcp_openreq_free(req);
|
| 1241 |
|
|
|
| 1242 |
|
|
TCP_INC_STATS_BH(TcpAttemptFails);
|
| 1243 |
|
|
return 0; /* don't send reset */
|
| 1244 |
|
|
}
|
| 1245 |
|
|
|
| 1246 |
|
|
static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
|
| 1247 |
|
|
struct open_request *req,
|
| 1248 |
|
|
struct dst_entry *dst)
|
| 1249 |
|
|
{
|
| 1250 |
|
|
struct ipv6_pinfo *np;
|
| 1251 |
|
|
struct flowi fl;
|
| 1252 |
|
|
struct tcp_opt *newtp;
|
| 1253 |
|
|
struct sock *newsk;
|
| 1254 |
|
|
struct ipv6_txoptions *opt;
|
| 1255 |
|
|
|
| 1256 |
|
|
if (skb->protocol == htons(ETH_P_IP)) {
|
| 1257 |
|
|
/*
|
| 1258 |
|
|
* v6 mapped
|
| 1259 |
|
|
*/
|
| 1260 |
|
|
|
| 1261 |
|
|
newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
|
| 1262 |
|
|
|
| 1263 |
|
|
if (newsk == NULL)
|
| 1264 |
|
|
return NULL;
|
| 1265 |
|
|
|
| 1266 |
|
|
np = &newsk->net_pinfo.af_inet6;
|
| 1267 |
|
|
|
| 1268 |
|
|
ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000FFFF),
|
| 1269 |
|
|
newsk->daddr);
|
| 1270 |
|
|
|
| 1271 |
|
|
ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
|
| 1272 |
|
|
newsk->saddr);
|
| 1273 |
|
|
|
| 1274 |
|
|
ipv6_addr_copy(&np->rcv_saddr, &np->saddr);
|
| 1275 |
|
|
|
| 1276 |
|
|
newsk->tp_pinfo.af_tcp.af_specific = &ipv6_mapped;
|
| 1277 |
|
|
newsk->backlog_rcv = tcp_v4_do_rcv;
|
| 1278 |
|
|
newsk->net_pinfo.af_inet6.pktoptions = NULL;
|
| 1279 |
|
|
newsk->net_pinfo.af_inet6.opt = NULL;
|
| 1280 |
|
|
newsk->net_pinfo.af_inet6.mcast_oif = tcp_v6_iif(skb);
|
| 1281 |
|
|
newsk->net_pinfo.af_inet6.mcast_hops = skb->nh.ipv6h->hop_limit;
|
| 1282 |
|
|
|
| 1283 |
|
|
/* Charge newly allocated IPv6 socket. Though it is mapped,
|
| 1284 |
|
|
* it is IPv6 yet.
|
| 1285 |
|
|
*/
|
| 1286 |
|
|
#ifdef INET_REFCNT_DEBUG
|
| 1287 |
|
|
atomic_inc(&inet6_sock_nr);
|
| 1288 |
|
|
#endif
|
| 1289 |
|
|
MOD_INC_USE_COUNT;
|
| 1290 |
|
|
|
| 1291 |
|
|
/* It is tricky place. Until this moment IPv4 tcp
|
| 1292 |
|
|
worked with IPv6 af_tcp.af_specific.
|
| 1293 |
|
|
Sync it now.
|
| 1294 |
|
|
*/
|
| 1295 |
|
|
tcp_sync_mss(newsk, newsk->tp_pinfo.af_tcp.pmtu_cookie);
|
| 1296 |
|
|
|
| 1297 |
|
|
return newsk;
|
| 1298 |
|
|
}
|
| 1299 |
|
|
|
| 1300 |
|
|
opt = sk->net_pinfo.af_inet6.opt;
|
| 1301 |
|
|
|
| 1302 |
|
|
if (tcp_acceptq_is_full(sk))
|
| 1303 |
|
|
goto out_overflow;
|
| 1304 |
|
|
|
| 1305 |
|
|
if (sk->net_pinfo.af_inet6.rxopt.bits.srcrt == 2 &&
|
| 1306 |
|
|
opt == NULL && req->af.v6_req.pktopts) {
|
| 1307 |
|
|
struct inet6_skb_parm *rxopt = (struct inet6_skb_parm *)req->af.v6_req.pktopts->cb;
|
| 1308 |
|
|
if (rxopt->srcrt)
|
| 1309 |
|
|
opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(req->af.v6_req.pktopts->nh.raw+rxopt->srcrt));
|
| 1310 |
|
|
}
|
| 1311 |
|
|
|
| 1312 |
|
|
if (dst == NULL) {
|
| 1313 |
|
|
fl.proto = IPPROTO_TCP;
|
| 1314 |
|
|
fl.nl_u.ip6_u.daddr = &req->af.v6_req.rmt_addr;
|
| 1315 |
|
|
if (opt && opt->srcrt) {
|
| 1316 |
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
|
| 1317 |
|
|
fl.nl_u.ip6_u.daddr = rt0->addr;
|
| 1318 |
|
|
}
|
| 1319 |
|
|
fl.nl_u.ip6_u.saddr = &req->af.v6_req.loc_addr;
|
| 1320 |
|
|
fl.fl6_flowlabel = 0;
|
| 1321 |
|
|
fl.oif = sk->bound_dev_if;
|
| 1322 |
|
|
fl.uli_u.ports.dport = req->rmt_port;
|
| 1323 |
|
|
fl.uli_u.ports.sport = sk->sport;
|
| 1324 |
|
|
|
| 1325 |
|
|
dst = ip6_route_output(sk, &fl);
|
| 1326 |
|
|
}
|
| 1327 |
|
|
|
| 1328 |
|
|
if (dst->error)
|
| 1329 |
|
|
goto out;
|
| 1330 |
|
|
|
| 1331 |
|
|
newsk = tcp_create_openreq_child(sk, req, skb);
|
| 1332 |
|
|
if (newsk == NULL)
|
| 1333 |
|
|
goto out;
|
| 1334 |
|
|
|
| 1335 |
|
|
/* Charge newly allocated IPv6 socket */
|
| 1336 |
|
|
#ifdef INET_REFCNT_DEBUG
|
| 1337 |
|
|
atomic_inc(&inet6_sock_nr);
|
| 1338 |
|
|
#endif
|
| 1339 |
|
|
MOD_INC_USE_COUNT;
|
| 1340 |
|
|
|
| 1341 |
|
|
ip6_dst_store(newsk, dst, NULL);
|
| 1342 |
|
|
sk->route_caps = dst->dev->features&~NETIF_F_IP_CSUM;
|
| 1343 |
|
|
|
| 1344 |
|
|
newtp = &(newsk->tp_pinfo.af_tcp);
|
| 1345 |
|
|
|
| 1346 |
|
|
np = &newsk->net_pinfo.af_inet6;
|
| 1347 |
|
|
ipv6_addr_copy(&np->daddr, &req->af.v6_req.rmt_addr);
|
| 1348 |
|
|
ipv6_addr_copy(&np->saddr, &req->af.v6_req.loc_addr);
|
| 1349 |
|
|
ipv6_addr_copy(&np->rcv_saddr, &req->af.v6_req.loc_addr);
|
| 1350 |
|
|
newsk->bound_dev_if = req->af.v6_req.iif;
|
| 1351 |
|
|
|
| 1352 |
|
|
/* Now IPv6 options...
|
| 1353 |
|
|
|
| 1354 |
|
|
First: no IPv4 options.
|
| 1355 |
|
|
*/
|
| 1356 |
|
|
newsk->protinfo.af_inet.opt = NULL;
|
| 1357 |
|
|
|
| 1358 |
|
|
/* Clone RX bits */
|
| 1359 |
|
|
np->rxopt.all = sk->net_pinfo.af_inet6.rxopt.all;
|
| 1360 |
|
|
|
| 1361 |
|
|
/* Clone pktoptions received with SYN */
|
| 1362 |
|
|
np->pktoptions = NULL;
|
| 1363 |
|
|
if (req->af.v6_req.pktopts) {
|
| 1364 |
|
|
np->pktoptions = skb_clone(req->af.v6_req.pktopts, GFP_ATOMIC);
|
| 1365 |
|
|
kfree_skb(req->af.v6_req.pktopts);
|
| 1366 |
|
|
req->af.v6_req.pktopts = NULL;
|
| 1367 |
|
|
if (np->pktoptions)
|
| 1368 |
|
|
skb_set_owner_r(np->pktoptions, newsk);
|
| 1369 |
|
|
}
|
| 1370 |
|
|
np->opt = NULL;
|
| 1371 |
|
|
np->mcast_oif = tcp_v6_iif(skb);
|
| 1372 |
|
|
np->mcast_hops = skb->nh.ipv6h->hop_limit;
|
| 1373 |
|
|
|
| 1374 |
|
|
/* Clone native IPv6 options from listening socket (if any)
|
| 1375 |
|
|
|
| 1376 |
|
|
Yes, keeping reference count would be much more clever,
|
| 1377 |
|
|
but we make one more one thing there: reattach optmem
|
| 1378 |
|
|
to newsk.
|
| 1379 |
|
|
*/
|
| 1380 |
|
|
if (opt) {
|
| 1381 |
|
|
np->opt = ipv6_dup_options(newsk, opt);
|
| 1382 |
|
|
if (opt != sk->net_pinfo.af_inet6.opt)
|
| 1383 |
|
|
sock_kfree_s(sk, opt, opt->tot_len);
|
| 1384 |
|
|
}
|
| 1385 |
|
|
|
| 1386 |
|
|
newtp->ext_header_len = 0;
|
| 1387 |
|
|
if (np->opt)
|
| 1388 |
|
|
newtp->ext_header_len = np->opt->opt_nflen + np->opt->opt_flen;
|
| 1389 |
|
|
|
| 1390 |
|
|
tcp_sync_mss(newsk, dst->pmtu);
|
| 1391 |
|
|
newtp->advmss = dst->advmss;
|
| 1392 |
|
|
tcp_initialize_rcv_mss(newsk);
|
| 1393 |
|
|
|
| 1394 |
|
|
newsk->daddr = LOOPBACK4_IPV6;
|
| 1395 |
|
|
newsk->saddr = LOOPBACK4_IPV6;
|
| 1396 |
|
|
newsk->rcv_saddr= LOOPBACK4_IPV6;
|
| 1397 |
|
|
|
| 1398 |
|
|
__tcp_v6_hash(newsk);
|
| 1399 |
|
|
tcp_inherit_port(sk, newsk);
|
| 1400 |
|
|
|
| 1401 |
|
|
return newsk;
|
| 1402 |
|
|
|
| 1403 |
|
|
out_overflow:
|
| 1404 |
|
|
NET_INC_STATS_BH(ListenOverflows);
|
| 1405 |
|
|
out:
|
| 1406 |
|
|
NET_INC_STATS_BH(ListenDrops);
|
| 1407 |
|
|
if (opt && opt != sk->net_pinfo.af_inet6.opt)
|
| 1408 |
|
|
sock_kfree_s(sk, opt, opt->tot_len);
|
| 1409 |
|
|
dst_release(dst);
|
| 1410 |
|
|
return NULL;
|
| 1411 |
|
|
}
|
| 1412 |
|
|
|
| 1413 |
|
|
static int tcp_v6_checksum_init(struct sk_buff *skb)
|
| 1414 |
|
|
{
|
| 1415 |
|
|
if (skb->ip_summed == CHECKSUM_HW) {
|
| 1416 |
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
| 1417 |
|
|
if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
|
| 1418 |
|
|
&skb->nh.ipv6h->daddr,skb->csum))
|
| 1419 |
|
|
return 0;
|
| 1420 |
|
|
NETDEBUG(if (net_ratelimit()) printk(KERN_DEBUG "hw tcp v6 csum failed\n"));
|
| 1421 |
|
|
}
|
| 1422 |
|
|
if (skb->len <= 76) {
|
| 1423 |
|
|
if (tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
|
| 1424 |
|
|
&skb->nh.ipv6h->daddr,skb_checksum(skb, 0, skb->len, 0)))
|
| 1425 |
|
|
return -1;
|
| 1426 |
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
| 1427 |
|
|
} else {
|
| 1428 |
|
|
skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
|
| 1429 |
|
|
&skb->nh.ipv6h->daddr,0);
|
| 1430 |
|
|
}
|
| 1431 |
|
|
return 0;
|
| 1432 |
|
|
}
|
| 1433 |
|
|
|
| 1434 |
|
|
/* The socket must have it's spinlock held when we get
|
| 1435 |
|
|
* here.
|
| 1436 |
|
|
*
|
| 1437 |
|
|
* We have a potential double-lock case here, so even when
|
| 1438 |
|
|
* doing backlog processing we use the BH locking scheme.
|
| 1439 |
|
|
* This is because we cannot sleep with the original spinlock
|
| 1440 |
|
|
* held.
|
| 1441 |
|
|
*/
|
| 1442 |
|
|
static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
|
| 1443 |
|
|
{
|
| 1444 |
|
|
struct sk_buff *opt_skb = NULL;
|
| 1445 |
|
|
|
| 1446 |
|
|
/* Imagine: socket is IPv6. IPv4 packet arrives,
|
| 1447 |
|
|
goes to IPv4 receive handler and backlogged.
|
| 1448 |
|
|
From backlog it always goes here. Kerboom...
|
| 1449 |
|
|
Fortunately, tcp_rcv_established and rcv_established
|
| 1450 |
|
|
handle them correctly, but it is not case with
|
| 1451 |
|
|
tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
|
| 1452 |
|
|
*/
|
| 1453 |
|
|
|
| 1454 |
|
|
if (skb->protocol == htons(ETH_P_IP))
|
| 1455 |
|
|
return tcp_v4_do_rcv(sk, skb);
|
| 1456 |
|
|
|
| 1457 |
|
|
/*
|
| 1458 |
|
|
* socket locking is here for SMP purposes as backlog rcv
|
| 1459 |
|
|
* is currently called with bh processing disabled.
|
| 1460 |
|
|
*/
|
| 1461 |
|
|
|
| 1462 |
|
|
IP6_INC_STATS_BH(Ip6InDelivers);
|
| 1463 |
|
|
|
| 1464 |
|
|
/* Do Stevens' IPV6_PKTOPTIONS.
|
| 1465 |
|
|
|
| 1466 |
|
|
Yes, guys, it is the only place in our code, where we
|
| 1467 |
|
|
may make it not affecting IPv4.
|
| 1468 |
|
|
The rest of code is protocol independent,
|
| 1469 |
|
|
and I do not like idea to uglify IPv4.
|
| 1470 |
|
|
|
| 1471 |
|
|
Actually, all the idea behind IPV6_PKTOPTIONS
|
| 1472 |
|
|
looks not very well thought. For now we latch
|
| 1473 |
|
|
options, received in the last packet, enqueued
|
| 1474 |
|
|
by tcp. Feel free to propose better solution.
|
| 1475 |
|
|
--ANK (980728)
|
| 1476 |
|
|
*/
|
| 1477 |
|
|
if (sk->net_pinfo.af_inet6.rxopt.all)
|
| 1478 |
|
|
opt_skb = skb_clone(skb, GFP_ATOMIC);
|
| 1479 |
|
|
|
| 1480 |
|
|
if (sk->state == TCP_ESTABLISHED) { /* Fast path */
|
| 1481 |
|
|
TCP_CHECK_TIMER(sk);
|
| 1482 |
|
|
if (tcp_rcv_established(sk, skb, skb->h.th, skb->len))
|
| 1483 |
|
|
goto reset;
|
| 1484 |
|
|
TCP_CHECK_TIMER(sk);
|
| 1485 |
|
|
if (opt_skb)
|
| 1486 |
|
|
goto ipv6_pktoptions;
|
| 1487 |
|
|
return 0;
|
| 1488 |
|
|
}
|
| 1489 |
|
|
|
| 1490 |
|
|
if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb))
|
| 1491 |
|
|
goto csum_err;
|
| 1492 |
|
|
|
| 1493 |
|
|
if (sk->state == TCP_LISTEN) {
|
| 1494 |
|
|
struct sock *nsk = tcp_v6_hnd_req(sk, skb);
|
| 1495 |
|
|
if (!nsk)
|
| 1496 |
|
|
goto discard;
|
| 1497 |
|
|
|
| 1498 |
|
|
/*
|
| 1499 |
|
|
* Queue it on the new socket if the new socket is active,
|
| 1500 |
|
|
* otherwise we just shortcircuit this and continue with
|
| 1501 |
|
|
* the new socket..
|
| 1502 |
|
|
*/
|
| 1503 |
|
|
if(nsk != sk) {
|
| 1504 |
|
|
if (tcp_child_process(sk, nsk, skb))
|
| 1505 |
|
|
goto reset;
|
| 1506 |
|
|
if (opt_skb)
|
| 1507 |
|
|
__kfree_skb(opt_skb);
|
| 1508 |
|
|
return 0;
|
| 1509 |
|
|
}
|
| 1510 |
|
|
}
|
| 1511 |
|
|
|
| 1512 |
|
|
TCP_CHECK_TIMER(sk);
|
| 1513 |
|
|
if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len))
|
| 1514 |
|
|
goto reset;
|
| 1515 |
|
|
TCP_CHECK_TIMER(sk);
|
| 1516 |
|
|
if (opt_skb)
|
| 1517 |
|
|
goto ipv6_pktoptions;
|
| 1518 |
|
|
return 0;
|
| 1519 |
|
|
|
| 1520 |
|
|
reset:
|
| 1521 |
|
|
tcp_v6_send_reset(skb);
|
| 1522 |
|
|
discard:
|
| 1523 |
|
|
if (opt_skb)
|
| 1524 |
|
|
__kfree_skb(opt_skb);
|
| 1525 |
|
|
kfree_skb(skb);
|
| 1526 |
|
|
return 0;
|
| 1527 |
|
|
csum_err:
|
| 1528 |
|
|
TCP_INC_STATS_BH(TcpInErrs);
|
| 1529 |
|
|
goto discard;
|
| 1530 |
|
|
|
| 1531 |
|
|
|
| 1532 |
|
|
ipv6_pktoptions:
|
| 1533 |
|
|
/* Do you ask, what is it?
|
| 1534 |
|
|
|
| 1535 |
|
|
1. skb was enqueued by tcp.
|
| 1536 |
|
|
2. skb is added to tail of read queue, rather than out of order.
|
| 1537 |
|
|
3. socket is not in passive state.
|
| 1538 |
|
|
4. Finally, it really contains options, which user wants to receive.
|
| 1539 |
|
|
*/
|
| 1540 |
|
|
if (TCP_SKB_CB(opt_skb)->end_seq == sk->tp_pinfo.af_tcp.rcv_nxt &&
|
| 1541 |
|
|
!((1<<sk->state)&(TCPF_CLOSE|TCPF_LISTEN))) {
|
| 1542 |
|
|
if (sk->net_pinfo.af_inet6.rxopt.bits.rxinfo)
|
| 1543 |
|
|
sk->net_pinfo.af_inet6.mcast_oif = tcp_v6_iif(opt_skb);
|
| 1544 |
|
|
if (sk->net_pinfo.af_inet6.rxopt.bits.rxhlim)
|
| 1545 |
|
|
sk->net_pinfo.af_inet6.mcast_hops = opt_skb->nh.ipv6h->hop_limit;
|
| 1546 |
|
|
if (ipv6_opt_accepted(sk, opt_skb)) {
|
| 1547 |
|
|
skb_set_owner_r(opt_skb, sk);
|
| 1548 |
|
|
opt_skb = xchg(&sk->net_pinfo.af_inet6.pktoptions, opt_skb);
|
| 1549 |
|
|
} else {
|
| 1550 |
|
|
__kfree_skb(opt_skb);
|
| 1551 |
|
|
opt_skb = xchg(&sk->net_pinfo.af_inet6.pktoptions, NULL);
|
| 1552 |
|
|
}
|
| 1553 |
|
|
}
|
| 1554 |
|
|
|
| 1555 |
|
|
if (opt_skb)
|
| 1556 |
|
|
kfree_skb(opt_skb);
|
| 1557 |
|
|
return 0;
|
| 1558 |
|
|
}
|
| 1559 |
|
|
|
| 1560 |
|
|
int tcp_v6_rcv(struct sk_buff *skb)
|
| 1561 |
|
|
{
|
| 1562 |
|
|
struct tcphdr *th;
|
| 1563 |
|
|
struct sock *sk;
|
| 1564 |
|
|
int ret;
|
| 1565 |
|
|
|
| 1566 |
|
|
if (skb->pkt_type != PACKET_HOST)
|
| 1567 |
|
|
goto discard_it;
|
| 1568 |
|
|
|
| 1569 |
|
|
/*
|
| 1570 |
|
|
* Count it even if it's bad.
|
| 1571 |
|
|
*/
|
| 1572 |
|
|
TCP_INC_STATS_BH(TcpInSegs);
|
| 1573 |
|
|
|
| 1574 |
|
|
if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
|
| 1575 |
|
|
goto discard_it;
|
| 1576 |
|
|
|
| 1577 |
|
|
th = skb->h.th;
|
| 1578 |
|
|
|
| 1579 |
|
|
if (th->doff < sizeof(struct tcphdr)/4)
|
| 1580 |
|
|
goto bad_packet;
|
| 1581 |
|
|
if (!pskb_may_pull(skb, th->doff*4))
|
| 1582 |
|
|
goto discard_it;
|
| 1583 |
|
|
|
| 1584 |
|
|
if ((skb->ip_summed != CHECKSUM_UNNECESSARY &&
|
| 1585 |
|
|
tcp_v6_checksum_init(skb) < 0))
|
| 1586 |
|
|
goto bad_packet;
|
| 1587 |
|
|
|
| 1588 |
|
|
th = skb->h.th;
|
| 1589 |
|
|
TCP_SKB_CB(skb)->seq = ntohl(th->seq);
|
| 1590 |
|
|
TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
|
| 1591 |
|
|
skb->len - th->doff*4);
|
| 1592 |
|
|
TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
|
| 1593 |
|
|
TCP_SKB_CB(skb)->when = 0;
|
| 1594 |
|
|
TCP_SKB_CB(skb)->flags = ip6_get_dsfield(skb->nh.ipv6h);
|
| 1595 |
|
|
TCP_SKB_CB(skb)->sacked = 0;
|
| 1596 |
|
|
|
| 1597 |
|
|
sk = __tcp_v6_lookup(&skb->nh.ipv6h->saddr, th->source,
|
| 1598 |
|
|
&skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_iif(skb));
|
| 1599 |
|
|
|
| 1600 |
|
|
if (!sk)
|
| 1601 |
|
|
goto no_tcp_socket;
|
| 1602 |
|
|
|
| 1603 |
|
|
process:
|
| 1604 |
|
|
if(!ipsec_sk_policy(sk,skb))
|
| 1605 |
|
|
goto discard_and_relse;
|
| 1606 |
|
|
if(sk->state == TCP_TIME_WAIT)
|
| 1607 |
|
|
goto do_time_wait;
|
| 1608 |
|
|
|
| 1609 |
|
|
if (sk_filter(sk, skb, 0))
|
| 1610 |
|
|
goto discard_and_relse;
|
| 1611 |
|
|
|
| 1612 |
|
|
skb->dev = NULL;
|
| 1613 |
|
|
|
| 1614 |
|
|
bh_lock_sock(sk);
|
| 1615 |
|
|
ret = 0;
|
| 1616 |
|
|
if (!sk->lock.users) {
|
| 1617 |
|
|
if (!tcp_prequeue(sk, skb))
|
| 1618 |
|
|
ret = tcp_v6_do_rcv(sk, skb);
|
| 1619 |
|
|
} else
|
| 1620 |
|
|
sk_add_backlog(sk, skb);
|
| 1621 |
|
|
bh_unlock_sock(sk);
|
| 1622 |
|
|
|
| 1623 |
|
|
sock_put(sk);
|
| 1624 |
|
|
return ret;
|
| 1625 |
|
|
|
| 1626 |
|
|
no_tcp_socket:
|
| 1627 |
|
|
if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
|
| 1628 |
|
|
bad_packet:
|
| 1629 |
|
|
TCP_INC_STATS_BH(TcpInErrs);
|
| 1630 |
|
|
} else {
|
| 1631 |
|
|
tcp_v6_send_reset(skb);
|
| 1632 |
|
|
}
|
| 1633 |
|
|
|
| 1634 |
|
|
discard_it:
|
| 1635 |
|
|
|
| 1636 |
|
|
/*
|
| 1637 |
|
|
* Discard frame
|
| 1638 |
|
|
*/
|
| 1639 |
|
|
|
| 1640 |
|
|
kfree_skb(skb);
|
| 1641 |
|
|
return 0;
|
| 1642 |
|
|
|
| 1643 |
|
|
discard_and_relse:
|
| 1644 |
|
|
sock_put(sk);
|
| 1645 |
|
|
goto discard_it;
|
| 1646 |
|
|
|
| 1647 |
|
|
do_time_wait:
|
| 1648 |
|
|
if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
|
| 1649 |
|
|
TCP_INC_STATS_BH(TcpInErrs);
|
| 1650 |
|
|
tcp_tw_put((struct tcp_tw_bucket *) sk);
|
| 1651 |
|
|
goto discard_it;
|
| 1652 |
|
|
}
|
| 1653 |
|
|
|
| 1654 |
|
|
switch(tcp_timewait_state_process((struct tcp_tw_bucket *)sk,
|
| 1655 |
|
|
skb, th, skb->len)) {
|
| 1656 |
|
|
case TCP_TW_SYN:
|
| 1657 |
|
|
{
|
| 1658 |
|
|
struct sock *sk2;
|
| 1659 |
|
|
|
| 1660 |
|
|
sk2 = tcp_v6_lookup_listener(&skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_iif(skb));
|
| 1661 |
|
|
if (sk2 != NULL) {
|
| 1662 |
|
|
tcp_tw_deschedule((struct tcp_tw_bucket *)sk);
|
| 1663 |
|
|
tcp_timewait_kill((struct tcp_tw_bucket *)sk);
|
| 1664 |
|
|
tcp_tw_put((struct tcp_tw_bucket *)sk);
|
| 1665 |
|
|
sk = sk2;
|
| 1666 |
|
|
goto process;
|
| 1667 |
|
|
}
|
| 1668 |
|
|
/* Fall through to ACK */
|
| 1669 |
|
|
}
|
| 1670 |
|
|
case TCP_TW_ACK:
|
| 1671 |
|
|
tcp_v6_timewait_ack(sk, skb);
|
| 1672 |
|
|
break;
|
| 1673 |
|
|
case TCP_TW_RST:
|
| 1674 |
|
|
goto no_tcp_socket;
|
| 1675 |
|
|
case TCP_TW_SUCCESS:;
|
| 1676 |
|
|
}
|
| 1677 |
|
|
goto discard_it;
|
| 1678 |
|
|
}
|
| 1679 |
|
|
|
| 1680 |
|
|
static int tcp_v6_rebuild_header(struct sock *sk)
|
| 1681 |
|
|
{
|
| 1682 |
|
|
int err;
|
| 1683 |
|
|
struct dst_entry *dst;
|
| 1684 |
|
|
struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
|
| 1685 |
|
|
|
| 1686 |
|
|
dst = __sk_dst_check(sk, np->dst_cookie);
|
| 1687 |
|
|
|
| 1688 |
|
|
if (dst == NULL) {
|
| 1689 |
|
|
struct flowi fl;
|
| 1690 |
|
|
|
| 1691 |
|
|
fl.proto = IPPROTO_TCP;
|
| 1692 |
|
|
fl.nl_u.ip6_u.daddr = &np->daddr;
|
| 1693 |
|
|
fl.nl_u.ip6_u.saddr = &np->saddr;
|
| 1694 |
|
|
fl.fl6_flowlabel = np->flow_label;
|
| 1695 |
|
|
fl.oif = sk->bound_dev_if;
|
| 1696 |
|
|
fl.uli_u.ports.dport = sk->dport;
|
| 1697 |
|
|
fl.uli_u.ports.sport = sk->sport;
|
| 1698 |
|
|
|
| 1699 |
|
|
if (np->opt && np->opt->srcrt) {
|
| 1700 |
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
|
| 1701 |
|
|
fl.nl_u.ip6_u.daddr = rt0->addr;
|
| 1702 |
|
|
}
|
| 1703 |
|
|
|
| 1704 |
|
|
dst = ip6_route_output(sk, &fl);
|
| 1705 |
|
|
|
| 1706 |
|
|
if (dst->error) {
|
| 1707 |
|
|
err = dst->error;
|
| 1708 |
|
|
dst_release(dst);
|
| 1709 |
|
|
sk->route_caps = 0;
|
| 1710 |
|
|
return err;
|
| 1711 |
|
|
}
|
| 1712 |
|
|
|
| 1713 |
|
|
ip6_dst_store(sk, dst, NULL);
|
| 1714 |
|
|
sk->route_caps = dst->dev->features&~NETIF_F_IP_CSUM;
|
| 1715 |
|
|
}
|
| 1716 |
|
|
|
| 1717 |
|
|
return 0;
|
| 1718 |
|
|
}
|
| 1719 |
|
|
|
| 1720 |
|
|
static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok)
|
| 1721 |
|
|
{
|
| 1722 |
|
|
struct sock *sk = skb->sk;
|
| 1723 |
|
|
struct ipv6_pinfo * np = &sk->net_pinfo.af_inet6;
|
| 1724 |
|
|
struct flowi fl;
|
| 1725 |
|
|
struct dst_entry *dst;
|
| 1726 |
|
|
|
| 1727 |
|
|
fl.proto = IPPROTO_TCP;
|
| 1728 |
|
|
fl.fl6_dst = &np->daddr;
|
| 1729 |
|
|
fl.fl6_src = &np->saddr;
|
| 1730 |
|
|
fl.fl6_flowlabel = np->flow_label;
|
| 1731 |
|
|
IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
|
| 1732 |
|
|
fl.oif = sk->bound_dev_if;
|
| 1733 |
|
|
fl.uli_u.ports.sport = sk->sport;
|
| 1734 |
|
|
fl.uli_u.ports.dport = sk->dport;
|
| 1735 |
|
|
|
| 1736 |
|
|
if (np->opt && np->opt->srcrt) {
|
| 1737 |
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
|
| 1738 |
|
|
fl.nl_u.ip6_u.daddr = rt0->addr;
|
| 1739 |
|
|
}
|
| 1740 |
|
|
|
| 1741 |
|
|
dst = __sk_dst_check(sk, np->dst_cookie);
|
| 1742 |
|
|
|
| 1743 |
|
|
if (dst == NULL) {
|
| 1744 |
|
|
dst = ip6_route_output(sk, &fl);
|
| 1745 |
|
|
|
| 1746 |
|
|
if (dst->error) {
|
| 1747 |
|
|
sk->err_soft = -dst->error;
|
| 1748 |
|
|
dst_release(dst);
|
| 1749 |
|
|
return -sk->err_soft;
|
| 1750 |
|
|
}
|
| 1751 |
|
|
|
| 1752 |
|
|
ip6_dst_store(sk, dst, NULL);
|
| 1753 |
|
|
}
|
| 1754 |
|
|
|
| 1755 |
|
|
skb->dst = dst_clone(dst);
|
| 1756 |
|
|
|
| 1757 |
|
|
/* Restore final destination back after routing done */
|
| 1758 |
|
|
fl.nl_u.ip6_u.daddr = &np->daddr;
|
| 1759 |
|
|
|
| 1760 |
|
|
return ip6_xmit(sk, skb, &fl, np->opt);
|
| 1761 |
|
|
}
|
| 1762 |
|
|
|
| 1763 |
|
|
static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
|
| 1764 |
|
|
{
|
| 1765 |
|
|
struct ipv6_pinfo * np = &sk->net_pinfo.af_inet6;
|
| 1766 |
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
|
| 1767 |
|
|
|
| 1768 |
|
|
sin6->sin6_family = AF_INET6;
|
| 1769 |
|
|
memcpy(&sin6->sin6_addr, &np->daddr, sizeof(struct in6_addr));
|
| 1770 |
|
|
sin6->sin6_port = sk->dport;
|
| 1771 |
|
|
/* We do not store received flowlabel for TCP */
|
| 1772 |
|
|
sin6->sin6_flowinfo = 0;
|
| 1773 |
|
|
sin6->sin6_scope_id = 0;
|
| 1774 |
|
|
if (sk->bound_dev_if && ipv6_addr_type(&sin6->sin6_addr)&IPV6_ADDR_LINKLOCAL)
|
| 1775 |
|
|
sin6->sin6_scope_id = sk->bound_dev_if;
|
| 1776 |
|
|
}
|
| 1777 |
|
|
|
| 1778 |
|
|
static int tcp_v6_remember_stamp(struct sock *sk)
|
| 1779 |
|
|
{
|
| 1780 |
|
|
/* Alas, not yet... */
|
| 1781 |
|
|
return 0;
|
| 1782 |
|
|
}
|
| 1783 |
|
|
|
| 1784 |
|
|
static struct tcp_func ipv6_specific = {
|
| 1785 |
|
|
tcp_v6_xmit,
|
| 1786 |
|
|
tcp_v6_send_check,
|
| 1787 |
|
|
tcp_v6_rebuild_header,
|
| 1788 |
|
|
tcp_v6_conn_request,
|
| 1789 |
|
|
tcp_v6_syn_recv_sock,
|
| 1790 |
|
|
tcp_v6_remember_stamp,
|
| 1791 |
|
|
sizeof(struct ipv6hdr),
|
| 1792 |
|
|
|
| 1793 |
|
|
ipv6_setsockopt,
|
| 1794 |
|
|
ipv6_getsockopt,
|
| 1795 |
|
|
v6_addr2sockaddr,
|
| 1796 |
|
|
sizeof(struct sockaddr_in6)
|
| 1797 |
|
|
};
|
| 1798 |
|
|
|
| 1799 |
|
|
/*
|
| 1800 |
|
|
* TCP over IPv4 via INET6 API
|
| 1801 |
|
|
*/
|
| 1802 |
|
|
|
| 1803 |
|
|
static struct tcp_func ipv6_mapped = {
|
| 1804 |
|
|
ip_queue_xmit,
|
| 1805 |
|
|
tcp_v4_send_check,
|
| 1806 |
|
|
tcp_v4_rebuild_header,
|
| 1807 |
|
|
tcp_v6_conn_request,
|
| 1808 |
|
|
tcp_v6_syn_recv_sock,
|
| 1809 |
|
|
tcp_v4_remember_stamp,
|
| 1810 |
|
|
sizeof(struct iphdr),
|
| 1811 |
|
|
|
| 1812 |
|
|
ipv6_setsockopt,
|
| 1813 |
|
|
ipv6_getsockopt,
|
| 1814 |
|
|
v6_addr2sockaddr,
|
| 1815 |
|
|
sizeof(struct sockaddr_in6)
|
| 1816 |
|
|
};
|
| 1817 |
|
|
|
| 1818 |
|
|
|
| 1819 |
|
|
|
| 1820 |
|
|
/* NOTE: A lot of things set to zero explicitly by call to
|
| 1821 |
|
|
* sk_alloc() so need not be done here.
|
| 1822 |
|
|
*/
|
| 1823 |
|
|
static int tcp_v6_init_sock(struct sock *sk)
|
| 1824 |
|
|
{
|
| 1825 |
|
|
struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
|
| 1826 |
|
|
|
| 1827 |
|
|
skb_queue_head_init(&tp->out_of_order_queue);
|
| 1828 |
|
|
tcp_init_xmit_timers(sk);
|
| 1829 |
|
|
tcp_prequeue_init(tp);
|
| 1830 |
|
|
|
| 1831 |
|
|
tp->rto = TCP_TIMEOUT_INIT;
|
| 1832 |
|
|
tp->mdev = TCP_TIMEOUT_INIT;
|
| 1833 |
|
|
|
| 1834 |
|
|
/* So many TCP implementations out there (incorrectly) count the
|
| 1835 |
|
|
* initial SYN frame in their delayed-ACK and congestion control
|
| 1836 |
|
|
* algorithms that we must have the following bandaid to talk
|
| 1837 |
|
|
* efficiently to them. -DaveM
|
| 1838 |
|
|
*/
|
| 1839 |
|
|
tp->snd_cwnd = 2;
|
| 1840 |
|
|
|
| 1841 |
|
|
/* See draft-stevens-tcpca-spec-01 for discussion of the
|
| 1842 |
|
|
* initialization of these values.
|
| 1843 |
|
|
*/
|
| 1844 |
|
|
tp->snd_ssthresh = 0x7fffffff;
|
| 1845 |
|
|
tp->snd_cwnd_clamp = ~0;
|
| 1846 |
|
|
tp->mss_cache = 536;
|
| 1847 |
|
|
|
| 1848 |
|
|
tp->reordering = sysctl_tcp_reordering;
|
| 1849 |
|
|
|
| 1850 |
|
|
sk->state = TCP_CLOSE;
|
| 1851 |
|
|
|
| 1852 |
|
|
sk->tp_pinfo.af_tcp.af_specific = &ipv6_specific;
|
| 1853 |
|
|
|
| 1854 |
|
|
sk->write_space = tcp_write_space;
|
| 1855 |
|
|
sk->use_write_queue = 1;
|
| 1856 |
|
|
|
| 1857 |
|
|
sk->sndbuf = sysctl_tcp_wmem[1];
|
| 1858 |
|
|
sk->rcvbuf = sysctl_tcp_rmem[1];
|
| 1859 |
|
|
|
| 1860 |
|
|
atomic_inc(&tcp_sockets_allocated);
|
| 1861 |
|
|
|
| 1862 |
|
|
return 0;
|
| 1863 |
|
|
}
|
| 1864 |
|
|
|
| 1865 |
|
|
static int tcp_v6_destroy_sock(struct sock *sk)
|
| 1866 |
|
|
{
|
| 1867 |
|
|
struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
|
| 1868 |
|
|
|
| 1869 |
|
|
tcp_clear_xmit_timers(sk);
|
| 1870 |
|
|
|
| 1871 |
|
|
/* Cleanup up the write buffer. */
|
| 1872 |
|
|
tcp_writequeue_purge(sk);
|
| 1873 |
|
|
|
| 1874 |
|
|
/* Cleans up our, hopefully empty, out_of_order_queue. */
|
| 1875 |
|
|
__skb_queue_purge(&tp->out_of_order_queue);
|
| 1876 |
|
|
|
| 1877 |
|
|
/* Clean prequeue, it must be empty really */
|
| 1878 |
|
|
__skb_queue_purge(&tp->ucopy.prequeue);
|
| 1879 |
|
|
|
| 1880 |
|
|
/* Clean up a referenced TCP bind bucket. */
|
| 1881 |
|
|
if(sk->prev != NULL)
|
| 1882 |
|
|
tcp_put_port(sk);
|
| 1883 |
|
|
|
| 1884 |
|
|
/* If sendmsg cached page exists, toss it. */
|
| 1885 |
|
|
if (tp->sndmsg_page != NULL)
|
| 1886 |
|
|
__free_page(tp->sndmsg_page);
|
| 1887 |
|
|
|
| 1888 |
|
|
atomic_dec(&tcp_sockets_allocated);
|
| 1889 |
|
|
|
| 1890 |
|
|
return inet6_destroy_sock(sk);
|
| 1891 |
|
|
}
|
| 1892 |
|
|
|
| 1893 |
|
|
/* Proc filesystem TCPv6 sock list dumping. */
|
| 1894 |
|
|
static void get_openreq6(struct sock *sk, struct open_request *req, char *tmpbuf, int i, int uid)
|
| 1895 |
|
|
{
|
| 1896 |
|
|
struct in6_addr *dest, *src;
|
| 1897 |
|
|
int ttd = req->expires - jiffies;
|
| 1898 |
|
|
|
| 1899 |
|
|
if (ttd < 0)
|
| 1900 |
|
|
ttd = 0;
|
| 1901 |
|
|
|
| 1902 |
|
|
src = &req->af.v6_req.loc_addr;
|
| 1903 |
|
|
dest = &req->af.v6_req.rmt_addr;
|
| 1904 |
|
|
sprintf(tmpbuf,
|
| 1905 |
|
|
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
| 1906 |
|
|
"%02X %08X:%08X %02X:%08X %08X %5d %8d %d %d %p",
|
| 1907 |
|
|
i,
|
| 1908 |
|
|
src->s6_addr32[0], src->s6_addr32[1],
|
| 1909 |
|
|
src->s6_addr32[2], src->s6_addr32[3],
|
| 1910 |
|
|
ntohs(sk->sport),
|
| 1911 |
|
|
dest->s6_addr32[0], dest->s6_addr32[1],
|
| 1912 |
|
|
dest->s6_addr32[2], dest->s6_addr32[3],
|
| 1913 |
|
|
ntohs(req->rmt_port),
|
| 1914 |
|
|
TCP_SYN_RECV,
|
| 1915 |
|
|
0,0, /* could print option size, but that is af dependent. */
|
| 1916 |
|
|
1, /* timers active (only the expire timer) */
|
| 1917 |
|
|
ttd,
|
| 1918 |
|
|
req->retrans,
|
| 1919 |
|
|
uid,
|
| 1920 |
|
|
0, /* non standard timer */
|
| 1921 |
|
|
0, /* open_requests have no inode */
|
| 1922 |
|
|
0, req);
|
| 1923 |
|
|
}
|
| 1924 |
|
|
|
| 1925 |
|
|
static void get_tcp6_sock(struct sock *sp, char *tmpbuf, int i)
|
| 1926 |
|
|
{
|
| 1927 |
|
|
struct in6_addr *dest, *src;
|
| 1928 |
|
|
__u16 destp, srcp;
|
| 1929 |
|
|
int timer_active;
|
| 1930 |
|
|
unsigned long timer_expires;
|
| 1931 |
|
|
struct tcp_opt *tp = &sp->tp_pinfo.af_tcp;
|
| 1932 |
|
|
|
| 1933 |
|
|
dest = &sp->net_pinfo.af_inet6.daddr;
|
| 1934 |
|
|
src = &sp->net_pinfo.af_inet6.rcv_saddr;
|
| 1935 |
|
|
destp = ntohs(sp->dport);
|
| 1936 |
|
|
srcp = ntohs(sp->sport);
|
| 1937 |
|
|
if (tp->pending == TCP_TIME_RETRANS) {
|
| 1938 |
|
|
timer_active = 1;
|
| 1939 |
|
|
timer_expires = tp->timeout;
|
| 1940 |
|
|
} else if (tp->pending == TCP_TIME_PROBE0) {
|
| 1941 |
|
|
timer_active = 4;
|
| 1942 |
|
|
timer_expires = tp->timeout;
|
| 1943 |
|
|
} else if (timer_pending(&sp->timer)) {
|
| 1944 |
|
|
timer_active = 2;
|
| 1945 |
|
|
timer_expires = sp->timer.expires;
|
| 1946 |
|
|
} else {
|
| 1947 |
|
|
timer_active = 0;
|
| 1948 |
|
|
timer_expires = jiffies;
|
| 1949 |
|
|
}
|
| 1950 |
|
|
|
| 1951 |
|
|
sprintf(tmpbuf,
|
| 1952 |
|
|
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
| 1953 |
|
|
"%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d",
|
| 1954 |
|
|
i,
|
| 1955 |
|
|
src->s6_addr32[0], src->s6_addr32[1],
|
| 1956 |
|
|
src->s6_addr32[2], src->s6_addr32[3], srcp,
|
| 1957 |
|
|
dest->s6_addr32[0], dest->s6_addr32[1],
|
| 1958 |
|
|
dest->s6_addr32[2], dest->s6_addr32[3], destp,
|
| 1959 |
|
|
sp->state,
|
| 1960 |
|
|
tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq,
|
| 1961 |
|
|
timer_active, timer_expires-jiffies,
|
| 1962 |
|
|
tp->retransmits,
|
| 1963 |
|
|
sock_i_uid(sp),
|
| 1964 |
|
|
tp->probes_out,
|
| 1965 |
|
|
sock_i_ino(sp),
|
| 1966 |
|
|
atomic_read(&sp->refcnt), sp,
|
| 1967 |
|
|
tp->rto, tp->ack.ato, (tp->ack.quick<<1)|tp->ack.pingpong,
|
| 1968 |
|
|
tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
|
| 1969 |
|
|
);
|
| 1970 |
|
|
}
|
| 1971 |
|
|
|
| 1972 |
|
|
static void get_timewait6_sock(struct tcp_tw_bucket *tw, char *tmpbuf, int i)
|
| 1973 |
|
|
{
|
| 1974 |
|
|
struct in6_addr *dest, *src;
|
| 1975 |
|
|
__u16 destp, srcp;
|
| 1976 |
|
|
int ttd = tw->ttd - jiffies;
|
| 1977 |
|
|
|
| 1978 |
|
|
if (ttd < 0)
|
| 1979 |
|
|
ttd = 0;
|
| 1980 |
|
|
|
| 1981 |
|
|
dest = &tw->v6_daddr;
|
| 1982 |
|
|
src = &tw->v6_rcv_saddr;
|
| 1983 |
|
|
destp = ntohs(tw->dport);
|
| 1984 |
|
|
srcp = ntohs(tw->sport);
|
| 1985 |
|
|
|
| 1986 |
|
|
sprintf(tmpbuf,
|
| 1987 |
|
|
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
| 1988 |
|
|
"%02X %08X:%08X %02X:%08X %08X %5d %8d %d %d %p",
|
| 1989 |
|
|
i,
|
| 1990 |
|
|
src->s6_addr32[0], src->s6_addr32[1],
|
| 1991 |
|
|
src->s6_addr32[2], src->s6_addr32[3], srcp,
|
| 1992 |
|
|
dest->s6_addr32[0], dest->s6_addr32[1],
|
| 1993 |
|
|
dest->s6_addr32[2], dest->s6_addr32[3], destp,
|
| 1994 |
|
|
tw->substate, 0, 0,
|
| 1995 |
|
|
3, ttd, 0, 0, 0, 0,
|
| 1996 |
|
|
atomic_read(&tw->refcnt), tw);
|
| 1997 |
|
|
}
|
| 1998 |
|
|
|
| 1999 |
|
|
#define LINE_LEN 190
|
| 2000 |
|
|
#define LINE_FMT "%-190s\n"
|
| 2001 |
|
|
|
| 2002 |
|
|
int tcp6_get_info(char *buffer, char **start, off_t offset, int length)
|
| 2003 |
|
|
{
|
| 2004 |
|
|
int len = 0, num = 0, i;
|
| 2005 |
|
|
off_t begin, pos = 0;
|
| 2006 |
|
|
char tmpbuf[LINE_LEN+2];
|
| 2007 |
|
|
|
| 2008 |
|
|
if (offset < LINE_LEN+1)
|
| 2009 |
|
|
len += sprintf(buffer, LINE_FMT,
|
| 2010 |
|
|
" sl " /* 6 */
|
| 2011 |
|
|
"local_address " /* 38 */
|
| 2012 |
|
|
"remote_address " /* 38 */
|
| 2013 |
|
|
"st tx_queue rx_queue tr tm->when retrnsmt" /* 41 */
|
| 2014 |
|
|
" uid timeout inode"); /* 21 */
|
| 2015 |
|
|
/*----*/
|
| 2016 |
|
|
/*144 */
|
| 2017 |
|
|
|
| 2018 |
|
|
pos = LINE_LEN+1;
|
| 2019 |
|
|
|
| 2020 |
|
|
/* First, walk listening socket table. */
|
| 2021 |
|
|
tcp_listen_lock();
|
| 2022 |
|
|
for(i = 0; i < TCP_LHTABLE_SIZE; i++) {
|
| 2023 |
|
|
struct sock *sk = tcp_listening_hash[i];
|
| 2024 |
|
|
struct tcp_listen_opt *lopt;
|
| 2025 |
|
|
int k;
|
| 2026 |
|
|
|
| 2027 |
|
|
for (sk = tcp_listening_hash[i]; sk; sk = sk->next, num++) {
|
| 2028 |
|
|
struct open_request *req;
|
| 2029 |
|
|
int uid;
|
| 2030 |
|
|
struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
|
| 2031 |
|
|
|
| 2032 |
|
|
if (sk->family != PF_INET6)
|
| 2033 |
|
|
continue;
|
| 2034 |
|
|
pos += LINE_LEN+1;
|
| 2035 |
|
|
if (pos >= offset) {
|
| 2036 |
|
|
get_tcp6_sock(sk, tmpbuf, num);
|
| 2037 |
|
|
len += sprintf(buffer+len, LINE_FMT, tmpbuf);
|
| 2038 |
|
|
if (pos >= offset + length) {
|
| 2039 |
|
|
tcp_listen_unlock();
|
| 2040 |
|
|
goto out_no_bh;
|
| 2041 |
|
|
}
|
| 2042 |
|
|
}
|
| 2043 |
|
|
|
| 2044 |
|
|
uid = sock_i_uid(sk);
|
| 2045 |
|
|
read_lock_bh(&tp->syn_wait_lock);
|
| 2046 |
|
|
lopt = tp->listen_opt;
|
| 2047 |
|
|
if (lopt && lopt->qlen != 0) {
|
| 2048 |
|
|
for (k=0; k<TCP_SYNQ_HSIZE; k++) {
|
| 2049 |
|
|
for (req = lopt->syn_table[k]; req; req = req->dl_next, num++) {
|
| 2050 |
|
|
if (req->class->family != PF_INET6)
|
| 2051 |
|
|
continue;
|
| 2052 |
|
|
pos += LINE_LEN+1;
|
| 2053 |
|
|
if (pos <= offset)
|
| 2054 |
|
|
continue;
|
| 2055 |
|
|
get_openreq6(sk, req, tmpbuf, num, uid);
|
| 2056 |
|
|
len += sprintf(buffer+len, LINE_FMT, tmpbuf);
|
| 2057 |
|
|
if (pos >= offset + length) {
|
| 2058 |
|
|
read_unlock_bh(&tp->syn_wait_lock);
|
| 2059 |
|
|
tcp_listen_unlock();
|
| 2060 |
|
|
goto out_no_bh;
|
| 2061 |
|
|
}
|
| 2062 |
|
|
}
|
| 2063 |
|
|
}
|
| 2064 |
|
|
}
|
| 2065 |
|
|
read_unlock_bh(&tp->syn_wait_lock);
|
| 2066 |
|
|
|
| 2067 |
|
|
/* Completed requests are in normal socket hash table */
|
| 2068 |
|
|
}
|
| 2069 |
|
|
}
|
| 2070 |
|
|
tcp_listen_unlock();
|
| 2071 |
|
|
|
| 2072 |
|
|
local_bh_disable();
|
| 2073 |
|
|
|
| 2074 |
|
|
/* Next, walk established hash chain. */
|
| 2075 |
|
|
for (i = 0; i < tcp_ehash_size; i++) {
|
| 2076 |
|
|
struct tcp_ehash_bucket *head = &tcp_ehash[i];
|
| 2077 |
|
|
struct sock *sk;
|
| 2078 |
|
|
struct tcp_tw_bucket *tw;
|
| 2079 |
|
|
|
| 2080 |
|
|
read_lock(&head->lock);
|
| 2081 |
|
|
for(sk = head->chain; sk; sk = sk->next, num++) {
|
| 2082 |
|
|
if (sk->family != PF_INET6)
|
| 2083 |
|
|
continue;
|
| 2084 |
|
|
pos += LINE_LEN+1;
|
| 2085 |
|
|
if (pos <= offset)
|
| 2086 |
|
|
continue;
|
| 2087 |
|
|
get_tcp6_sock(sk, tmpbuf, num);
|
| 2088 |
|
|
len += sprintf(buffer+len, LINE_FMT, tmpbuf);
|
| 2089 |
|
|
if (pos >= offset + length) {
|
| 2090 |
|
|
read_unlock(&head->lock);
|
| 2091 |
|
|
goto out;
|
| 2092 |
|
|
}
|
| 2093 |
|
|
}
|
| 2094 |
|
|
for (tw = (struct tcp_tw_bucket *)tcp_ehash[i+tcp_ehash_size].chain;
|
| 2095 |
|
|
tw != NULL;
|
| 2096 |
|
|
tw = (struct tcp_tw_bucket *)tw->next, num++) {
|
| 2097 |
|
|
if (tw->family != PF_INET6)
|
| 2098 |
|
|
continue;
|
| 2099 |
|
|
pos += LINE_LEN+1;
|
| 2100 |
|
|
if (pos <= offset)
|
| 2101 |
|
|
continue;
|
| 2102 |
|
|
get_timewait6_sock(tw, tmpbuf, num);
|
| 2103 |
|
|
len += sprintf(buffer+len, LINE_FMT, tmpbuf);
|
| 2104 |
|
|
if (pos >= offset + length) {
|
| 2105 |
|
|
read_unlock(&head->lock);
|
| 2106 |
|
|
goto out;
|
| 2107 |
|
|
}
|
| 2108 |
|
|
}
|
| 2109 |
|
|
read_unlock(&head->lock);
|
| 2110 |
|
|
}
|
| 2111 |
|
|
|
| 2112 |
|
|
out:
|
| 2113 |
|
|
local_bh_enable();
|
| 2114 |
|
|
out_no_bh:
|
| 2115 |
|
|
|
| 2116 |
|
|
begin = len - (pos - offset);
|
| 2117 |
|
|
*start = buffer + begin;
|
| 2118 |
|
|
len -= begin;
|
| 2119 |
|
|
if (len > length)
|
| 2120 |
|
|
len = length;
|
| 2121 |
|
|
if (len < 0)
|
| 2122 |
|
|
len = 0;
|
| 2123 |
|
|
return len;
|
| 2124 |
|
|
}
|
| 2125 |
|
|
|
| 2126 |
|
|
struct proto tcpv6_prot = {
|
| 2127 |
|
|
name: "TCPv6",
|
| 2128 |
|
|
close: tcp_close,
|
| 2129 |
|
|
connect: tcp_v6_connect,
|
| 2130 |
|
|
disconnect: tcp_disconnect,
|
| 2131 |
|
|
accept: tcp_accept,
|
| 2132 |
|
|
ioctl: tcp_ioctl,
|
| 2133 |
|
|
init: tcp_v6_init_sock,
|
| 2134 |
|
|
destroy: tcp_v6_destroy_sock,
|
| 2135 |
|
|
shutdown: tcp_shutdown,
|
| 2136 |
|
|
setsockopt: tcp_setsockopt,
|
| 2137 |
|
|
getsockopt: tcp_getsockopt,
|
| 2138 |
|
|
sendmsg: tcp_sendmsg,
|
| 2139 |
|
|
recvmsg: tcp_recvmsg,
|
| 2140 |
|
|
backlog_rcv: tcp_v6_do_rcv,
|
| 2141 |
|
|
hash: tcp_v6_hash,
|
| 2142 |
|
|
unhash: tcp_unhash,
|
| 2143 |
|
|
get_port: tcp_v6_get_port,
|
| 2144 |
|
|
};
|
| 2145 |
|
|
|
| 2146 |
|
|
static struct inet6_protocol tcpv6_protocol =
|
| 2147 |
|
|
{
|
| 2148 |
|
|
tcp_v6_rcv, /* TCP handler */
|
| 2149 |
|
|
tcp_v6_err, /* TCP error control */
|
| 2150 |
|
|
NULL, /* next */
|
| 2151 |
|
|
IPPROTO_TCP, /* protocol ID */
|
| 2152 |
|
|
0, /* copy */
|
| 2153 |
|
|
NULL, /* data */
|
| 2154 |
|
|
"TCPv6" /* name */
|
| 2155 |
|
|
};
|
| 2156 |
|
|
|
| 2157 |
|
|
extern struct proto_ops inet6_stream_ops;
|
| 2158 |
|
|
|
| 2159 |
|
|
static struct inet_protosw tcpv6_protosw = {
|
| 2160 |
|
|
type: SOCK_STREAM,
|
| 2161 |
|
|
protocol: IPPROTO_TCP,
|
| 2162 |
|
|
prot: &tcpv6_prot,
|
| 2163 |
|
|
ops: &inet6_stream_ops,
|
| 2164 |
|
|
capability: -1,
|
| 2165 |
|
|
no_check: 0,
|
| 2166 |
|
|
flags: INET_PROTOSW_PERMANENT,
|
| 2167 |
|
|
};
|
| 2168 |
|
|
|
| 2169 |
|
|
void __init tcpv6_init(void)
|
| 2170 |
|
|
{
|
| 2171 |
|
|
/* register inet6 protocol */
|
| 2172 |
|
|
inet6_add_protocol(&tcpv6_protocol);
|
| 2173 |
|
|
inet6_register_protosw(&tcpv6_protosw);
|
| 2174 |
|
|
}
|
