tcp_ipv6.c 53.7 KB
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/*
 *	TCP over IPv6
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 *	Linux INET6 implementation
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 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *
 *	$Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $
 *
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 *	Based on:
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 *	linux/net/ipv4/tcp.c
 *	linux/net/ipv4/tcp_input.c
 *	linux/net/ipv4/tcp_output.c
 *
 *	Fixes:
 *	Hideaki YOSHIFUJI	:	sin6_scope_id support
 *	YOSHIFUJI Hideaki @USAGI and:	Support IPV6_V6ONLY socket option, which
 *	Alexey Kuznetsov		allow both IPv4 and IPv6 sockets to bind
 *					a single port at the same time.
 *	YOSHIFUJI Hideaki @USAGI:	convert /proc/net/tcp6 to seq_file.
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/jiffies.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/jhash.h>
#include <linux/ipsec.h>
#include <linux/times.h>

#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>

#include <net/tcp.h>
#include <net/ndisc.h>
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#include <net/inet6_hashtables.h>
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#include <net/inet6_connection_sock.h>
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#include <net/ipv6.h>
#include <net/transp_v6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/ip6_checksum.h>
#include <net/inet_ecn.h>
#include <net/protocol.h>
#include <net/xfrm.h>
#include <net/snmp.h>
#include <net/dsfield.h>
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#include <net/timewait_sock.h>
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#include <asm/uaccess.h>

#include <linux/proc_fs.h>
#include <linux/seq_file.h>

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#include <linux/crypto.h>
#include <linux/scatterlist.h>

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/* Socket used for sending RSTs and ACKs */
static struct socket *tcp6_socket;

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static void	tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
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static void	tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req);
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static void	tcp_v6_send_check(struct sock *sk, int len,
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				  struct sk_buff *skb);

static int	tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);

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static struct inet_connection_sock_af_ops ipv6_mapped;
static struct inet_connection_sock_af_ops ipv6_specific;
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#ifdef CONFIG_TCP_MD5SIG
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static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
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#endif
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static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
{
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	return inet_csk_get_port(&tcp_hashinfo, sk, snum,
				 inet6_csk_bind_conflict);
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}

static void tcp_v6_hash(struct sock *sk)
{
	if (sk->sk_state != TCP_CLOSE) {
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		if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
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			tcp_prot.hash(sk);
			return;
		}
		local_bh_disable();
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		__inet6_hash(&tcp_hashinfo, sk);
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		local_bh_enable();
	}
}

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static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
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				   struct in6_addr *saddr,
				   struct in6_addr *daddr,
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				   __wsum base)
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{
	return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
}

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static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
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{
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	return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
					    ipv6_hdr(skb)->saddr.s6_addr32,
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					    tcp_hdr(skb)->dest,
					    tcp_hdr(skb)->source);
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}

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static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
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			  int addr_len)
{
	struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
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	struct inet_sock *inet = inet_sk(sk);
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	struct inet_connection_sock *icsk = inet_csk(sk);
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	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
	struct in6_addr *saddr = NULL, *final_p = NULL, final;
	struct flowi fl;
	struct dst_entry *dst;
	int addr_type;
	int err;

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	if (addr_len < SIN6_LEN_RFC2133)
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		return -EINVAL;

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	if (usin->sin6_family != AF_INET6)
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		return(-EAFNOSUPPORT);

	memset(&fl, 0, sizeof(fl));

	if (np->sndflow) {
		fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
		IP6_ECN_flow_init(fl.fl6_flowlabel);
		if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
			struct ip6_flowlabel *flowlabel;
			flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
			if (flowlabel == NULL)
				return -EINVAL;
			ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
			fl6_sock_release(flowlabel);
		}
	}

	/*
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	 *	connect() to INADDR_ANY means loopback (BSD'ism).
	 */

	if(ipv6_addr_any(&usin->sin6_addr))
		usin->sin6_addr.s6_addr[15] = 0x1;
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	addr_type = ipv6_addr_type(&usin->sin6_addr);

	if(addr_type & IPV6_ADDR_MULTICAST)
		return -ENETUNREACH;

	if (addr_type&IPV6_ADDR_LINKLOCAL) {
		if (addr_len >= sizeof(struct sockaddr_in6) &&
		    usin->sin6_scope_id) {
			/* If interface is set while binding, indices
			 * must coincide.
			 */
			if (sk->sk_bound_dev_if &&
			    sk->sk_bound_dev_if != usin->sin6_scope_id)
				return -EINVAL;

			sk->sk_bound_dev_if = usin->sin6_scope_id;
		}

		/* Connect to link-local address requires an interface */
		if (!sk->sk_bound_dev_if)
			return -EINVAL;
	}

	if (tp->rx_opt.ts_recent_stamp &&
	    !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
		tp->rx_opt.ts_recent = 0;
		tp->rx_opt.ts_recent_stamp = 0;
		tp->write_seq = 0;
	}

	ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
	np->flow_label = fl.fl6_flowlabel;

	/*
	 *	TCP over IPv4
	 */

	if (addr_type == IPV6_ADDR_MAPPED) {
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		u32 exthdrlen = icsk->icsk_ext_hdr_len;
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		struct sockaddr_in sin;

		SOCK_DEBUG(sk, "connect: ipv4 mapped\n");

		if (__ipv6_only_sock(sk))
			return -ENETUNREACH;

		sin.sin_family = AF_INET;
		sin.sin_port = usin->sin6_port;
		sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];

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		icsk->icsk_af_ops = &ipv6_mapped;
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		sk->sk_backlog_rcv = tcp_v4_do_rcv;
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#ifdef CONFIG_TCP_MD5SIG
		tp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif
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		err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));

		if (err) {
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			icsk->icsk_ext_hdr_len = exthdrlen;
			icsk->icsk_af_ops = &ipv6_specific;
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			sk->sk_backlog_rcv = tcp_v6_do_rcv;
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#ifdef CONFIG_TCP_MD5SIG
			tp->af_specific = &tcp_sock_ipv6_specific;
#endif
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			goto failure;
		} else {
			ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
				      inet->saddr);
			ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
				      inet->rcv_saddr);
		}

		return err;
	}

	if (!ipv6_addr_any(&np->rcv_saddr))
		saddr = &np->rcv_saddr;

	fl.proto = IPPROTO_TCP;
	ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
	ipv6_addr_copy(&fl.fl6_src,
		       (saddr ? saddr : &np->saddr));
	fl.oif = sk->sk_bound_dev_if;
	fl.fl_ip_dport = usin->sin6_port;
	fl.fl_ip_sport = inet->sport;

	if (np->opt && np->opt->srcrt) {
		struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
		ipv6_addr_copy(&final, &fl.fl6_dst);
		ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
		final_p = &final;
	}

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	security_sk_classify_flow(sk, &fl);

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	err = ip6_dst_lookup(sk, &dst, &fl);
	if (err)
		goto failure;
	if (final_p)
		ipv6_addr_copy(&fl.fl6_dst, final_p);

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	if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
		if (err == -EREMOTE)
			err = ip6_dst_blackhole(sk, &dst, &fl);
		if (err < 0)
			goto failure;
	}
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	if (saddr == NULL) {
		saddr = &fl.fl6_src;
		ipv6_addr_copy(&np->rcv_saddr, saddr);
	}

	/* set the source address */
	ipv6_addr_copy(&np->saddr, saddr);
	inet->rcv_saddr = LOOPBACK4_IPV6;

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	sk->sk_gso_type = SKB_GSO_TCPV6;
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	__ip6_dst_store(sk, dst, NULL, NULL);
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	icsk->icsk_ext_hdr_len = 0;
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	if (np->opt)
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		icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
					  np->opt->opt_nflen);
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	tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);

	inet->dport = usin->sin6_port;

	tcp_set_state(sk, TCP_SYN_SENT);
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	err = inet6_hash_connect(&tcp_death_row, sk);
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	if (err)
		goto late_failure;

	if (!tp->write_seq)
		tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
							     np->daddr.s6_addr32,
							     inet->sport,
							     inet->dport);

	err = tcp_connect(sk);
	if (err)
		goto late_failure;

	return 0;

late_failure:
	tcp_set_state(sk, TCP_CLOSE);
	__sk_dst_reset(sk);
failure:
	inet->dport = 0;
	sk->sk_route_caps = 0;
	return err;
}

static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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		int type, int code, int offset, __be32 info)
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{
	struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
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	const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
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	struct ipv6_pinfo *np;
	struct sock *sk;
	int err;
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	struct tcp_sock *tp;
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	__u32 seq;

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	sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr,
			  th->source, skb->dev->ifindex);
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	if (sk == NULL) {
		ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
		return;
	}

	if (sk->sk_state == TCP_TIME_WAIT) {
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		inet_twsk_put(inet_twsk(sk));
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		return;
	}

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk))
		NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);

	if (sk->sk_state == TCP_CLOSE)
		goto out;

	tp = tcp_sk(sk);
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	seq = ntohl(th->seq);
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	if (sk->sk_state != TCP_LISTEN &&
	    !between(seq, tp->snd_una, tp->snd_nxt)) {
		NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
		goto out;
	}

	np = inet6_sk(sk);

	if (type == ICMPV6_PKT_TOOBIG) {
		struct dst_entry *dst = NULL;

		if (sock_owned_by_user(sk))
			goto out;
		if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
			goto out;

		/* icmp should have updated the destination cache entry */
		dst = __sk_dst_check(sk, np->dst_cookie);

		if (dst == NULL) {
			struct inet_sock *inet = inet_sk(sk);
			struct flowi fl;

			/* BUGGG_FUTURE: Again, it is not clear how
			   to handle rthdr case. Ignore this complexity
			   for now.
			 */
			memset(&fl, 0, sizeof(fl));
			fl.proto = IPPROTO_TCP;
			ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
			ipv6_addr_copy(&fl.fl6_src, &np->saddr);
			fl.oif = sk->sk_bound_dev_if;
			fl.fl_ip_dport = inet->dport;
			fl.fl_ip_sport = inet->sport;
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			security_skb_classify_flow(skb, &fl);
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			if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
				sk->sk_err_soft = -err;
				goto out;
			}

			if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
				sk->sk_err_soft = -err;
				goto out;
			}

		} else
			dst_hold(dst);

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		if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
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			tcp_sync_mss(sk, dst_mtu(dst));
			tcp_simple_retransmit(sk);
		} /* else let the usual retransmit timer handle it */
		dst_release(dst);
		goto out;
	}

	icmpv6_err_convert(type, code, &err);

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	/* Might be for an request_sock */
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	switch (sk->sk_state) {
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		struct request_sock *req, **prev;
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	case TCP_LISTEN:
		if (sock_owned_by_user(sk))
			goto out;

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		req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
					   &hdr->saddr, inet6_iif(skb));
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		if (!req)
			goto out;

		/* ICMPs are not backlogged, hence we cannot get
		 * an established socket here.
		 */
		BUG_TRAP(req->sk == NULL);

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		if (seq != tcp_rsk(req)->snt_isn) {
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			NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
			goto out;
		}

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		inet_csk_reqsk_queue_drop(sk, req, prev);
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		goto out;

	case TCP_SYN_SENT:
	case TCP_SYN_RECV:  /* Cannot happen.
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			       It can, it SYNs are crossed. --ANK */
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		if (!sock_owned_by_user(sk)) {
			sk->sk_err = err;
			sk->sk_error_report(sk);		/* Wake people up to see the error (see connect in sock.c) */

			tcp_done(sk);
		} else
			sk->sk_err_soft = err;
		goto out;
	}

	if (!sock_owned_by_user(sk) && np->recverr) {
		sk->sk_err = err;
		sk->sk_error_report(sk);
	} else
		sk->sk_err_soft = err;

out:
	bh_unlock_sock(sk);
	sock_put(sk);
}


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static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
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			      struct dst_entry *dst)
{
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	struct inet6_request_sock *treq = inet6_rsk(req);
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	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff * skb;
	struct ipv6_txoptions *opt = NULL;
	struct in6_addr * final_p = NULL, final;
	struct flowi fl;
	int err = -1;

	memset(&fl, 0, sizeof(fl));
	fl.proto = IPPROTO_TCP;
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	ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
	ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
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	fl.fl6_flowlabel = 0;
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	fl.oif = treq->iif;
	fl.fl_ip_dport = inet_rsk(req)->rmt_port;
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	fl.fl_ip_sport = inet_sk(sk)->sport;
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	security_req_classify_flow(req, &fl);
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	if (dst == NULL) {
		opt = np->opt;
		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;
		}

		err = ip6_dst_lookup(sk, &dst, &fl);
		if (err)
			goto done;
		if (final_p)
			ipv6_addr_copy(&fl.fl6_dst, final_p);
		if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
			goto done;
	}

	skb = tcp_make_synack(sk, dst, req);
	if (skb) {
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		struct tcphdr *th = tcp_hdr(skb);
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		th->check = tcp_v6_check(th, skb->len,
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					 &treq->loc_addr, &treq->rmt_addr,
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					 csum_partial((char *)th, skb->len, skb->csum));

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		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
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		err = ip6_xmit(sk, skb, &fl, opt, 0);
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		err = net_xmit_eval(err);
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	}

done:
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	if (opt && opt != np->opt)
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		sock_kfree_s(sk, opt, opt->tot_len);
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	dst_release(dst);
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	return err;
}

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static void tcp_v6_reqsk_destructor(struct request_sock *req)
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{
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	if (inet6_rsk(req)->pktopts)
		kfree_skb(inet6_rsk(req)->pktopts);
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}

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#ifdef CONFIG_TCP_MD5SIG
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
						   struct in6_addr *addr)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	BUG_ON(tp == NULL);

	if (!tp->md5sig_info || !tp->md5sig_info->entries6)
		return NULL;

	for (i = 0; i < tp->md5sig_info->entries6; i++) {
		if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0)
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			return &tp->md5sig_info->keys6[i].base;
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	}
	return NULL;
}

static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
						struct sock *addr_sk)
{
	return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
}

static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
						      struct request_sock *req)
{
	return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
}

static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
			     char *newkey, u8 newkeylen)
{
	/* Add key to the list */
	struct tcp6_md5sig_key *key;
	struct tcp_sock *tp = tcp_sk(sk);
	struct tcp6_md5sig_key *keys;

	key = (struct tcp6_md5sig_key*) tcp_v6_md5_do_lookup(sk, peer);
	if (key) {
		/* modify existing entry - just update that one */
570 571 572
		kfree(key->base.key);
		key->base.key = newkey;
		key->base.keylen = newkeylen;
573 574 575 576 577 578 579 580
	} else {
		/* reallocate new list if current one is full. */
		if (!tp->md5sig_info) {
			tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
			if (!tp->md5sig_info) {
				kfree(newkey);
				return -ENOMEM;
			}
581
			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605
		}
		tcp_alloc_md5sig_pool();
		if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
			keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
				       (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);

			if (!keys) {
				tcp_free_md5sig_pool();
				kfree(newkey);
				return -ENOMEM;
			}

			if (tp->md5sig_info->entries6)
				memmove(keys, tp->md5sig_info->keys6,
					(sizeof (tp->md5sig_info->keys6[0]) *
					 tp->md5sig_info->entries6));

			kfree(tp->md5sig_info->keys6);
			tp->md5sig_info->keys6 = keys;
			tp->md5sig_info->alloced6++;
		}

		ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
			       peer);
606 607
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628

		tp->md5sig_info->entries6++;
	}
	return 0;
}

static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
			       u8 *newkey, __u8 newkeylen)
{
	return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
				 newkey, newkeylen);
}

static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	for (i = 0; i < tp->md5sig_info->entries6; i++) {
		if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) {
			/* Free the key */
629
			kfree(tp->md5sig_info->keys6[i].base.key);
630 631 632 633 634
			tp->md5sig_info->entries6--;

			if (tp->md5sig_info->entries6 == 0) {
				kfree(tp->md5sig_info->keys6);
				tp->md5sig_info->keys6 = NULL;
635
				tp->md5sig_info->alloced6 = 0;
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659

				tcp_free_md5sig_pool();

				return 0;
			} else {
				/* shrink the database */
				if (tp->md5sig_info->entries6 != i)
					memmove(&tp->md5sig_info->keys6[i],
						&tp->md5sig_info->keys6[i+1],
						(tp->md5sig_info->entries6 - i)
						* sizeof (tp->md5sig_info->keys6[0]));
			}
		}
	}
	return -ENOENT;
}

static void tcp_v6_clear_md5_list (struct sock *sk)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	if (tp->md5sig_info->entries6) {
		for (i = 0; i < tp->md5sig_info->entries6; i++)
660
			kfree(tp->md5sig_info->keys6[i].base.key);
661 662 663 664 665 666 667 668 669 670
		tp->md5sig_info->entries6 = 0;
		tcp_free_md5sig_pool();
	}

	kfree(tp->md5sig_info->keys6);
	tp->md5sig_info->keys6 = NULL;
	tp->md5sig_info->alloced6 = 0;

	if (tp->md5sig_info->entries4) {
		for (i = 0; i < tp->md5sig_info->entries4; i++)
671
			kfree(tp->md5sig_info->keys4[i].base.key);
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
		tp->md5sig_info->entries4 = 0;
		tcp_free_md5sig_pool();
	}

	kfree(tp->md5sig_info->keys4);
	tp->md5sig_info->keys4 = NULL;
	tp->md5sig_info->alloced4 = 0;
}

static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
				  int optlen)
{
	struct tcp_md5sig cmd;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
	u8 *newkey;

	if (optlen < sizeof(cmd))
		return -EINVAL;

	if (copy_from_user(&cmd, optval, sizeof(cmd)))
		return -EFAULT;

	if (sin6->sin6_family != AF_INET6)
		return -EINVAL;

	if (!cmd.tcpm_keylen) {
		if (!tcp_sk(sk)->md5sig_info)
			return -ENOENT;
B
Brian Haley 已提交
700
		if (ipv6_addr_v4mapped(&sin6->sin6_addr))
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
			return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
		return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
	}

	if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
		return -EINVAL;

	if (!tcp_sk(sk)->md5sig_info) {
		struct tcp_sock *tp = tcp_sk(sk);
		struct tcp_md5sig_info *p;

		p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
		if (!p)
			return -ENOMEM;

		tp->md5sig_info = p;
717
		sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
718 719
	}

A
Arnaldo Carvalho de Melo 已提交
720
	newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
721 722
	if (!newkey)
		return -ENOMEM;
B
Brian Haley 已提交
723
	if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
		return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
					 newkey, cmd.tcpm_keylen);
	}
	return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
}

static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
				   struct in6_addr *saddr,
				   struct in6_addr *daddr,
				   struct tcphdr *th, int protocol,
				   int tcplen)
{
	struct scatterlist sg[4];
	__u16 data_len;
	int block = 0;
739
	__sum16 cksum;
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759
	struct tcp_md5sig_pool *hp;
	struct tcp6_pseudohdr *bp;
	struct hash_desc *desc;
	int err;
	unsigned int nbytes = 0;

	hp = tcp_get_md5sig_pool();
	if (!hp) {
		printk(KERN_WARNING "%s(): hash pool not found...\n", __FUNCTION__);
		goto clear_hash_noput;
	}
	bp = &hp->md5_blk.ip6;
	desc = &hp->md5_desc;

	/* 1. TCP pseudo-header (RFC2460) */
	ipv6_addr_copy(&bp->saddr, saddr);
	ipv6_addr_copy(&bp->daddr, daddr);
	bp->len = htonl(tcplen);
	bp->protocol = htonl(protocol);

760 761
	sg_init_table(sg, 4);

762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
	sg_set_buf(&sg[block++], bp, sizeof(*bp));
	nbytes += sizeof(*bp);

	/* 2. TCP header, excluding options */
	cksum = th->check;
	th->check = 0;
	sg_set_buf(&sg[block++], th, sizeof(*th));
	nbytes += sizeof(*th);

	/* 3. TCP segment data (if any) */
	data_len = tcplen - (th->doff << 2);
	if (data_len > 0) {
		u8 *data = (u8 *)th + (th->doff << 2);
		sg_set_buf(&sg[block++], data, data_len);
		nbytes += data_len;
	}

	/* 4. shared key */
	sg_set_buf(&sg[block++], key->key, key->keylen);
	nbytes += key->keylen;

783 784
	sg_mark_end(sg, block);

785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
	/* Now store the hash into the packet */
	err = crypto_hash_init(desc);
	if (err) {
		printk(KERN_WARNING "%s(): hash_init failed\n", __FUNCTION__);
		goto clear_hash;
	}
	err = crypto_hash_update(desc, sg, nbytes);
	if (err) {
		printk(KERN_WARNING "%s(): hash_update failed\n", __FUNCTION__);
		goto clear_hash;
	}
	err = crypto_hash_final(desc, md5_hash);
	if (err) {
		printk(KERN_WARNING "%s(): hash_final failed\n", __FUNCTION__);
		goto clear_hash;
	}

	/* Reset header, and free up the crypto */
	tcp_put_md5sig_pool();
	th->check = cksum;
out:
	return 0;
clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
	goto out;
}

static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
				struct sock *sk,
				struct dst_entry *dst,
				struct request_sock *req,
				struct tcphdr *th, int protocol,
				int tcplen)
{
	struct in6_addr *saddr, *daddr;

	if (sk) {
		saddr = &inet6_sk(sk)->saddr;
		daddr = &inet6_sk(sk)->daddr;
	} else {
		saddr = &inet6_rsk(req)->loc_addr;
		daddr = &inet6_rsk(req)->rmt_addr;
	}
	return tcp_v6_do_calc_md5_hash(md5_hash, key,
				       saddr, daddr,
				       th, protocol, tcplen);
}

static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
{
	__u8 *hash_location = NULL;
	struct tcp_md5sig_key *hash_expected;
839
	struct ipv6hdr *ip6h = ipv6_hdr(skb);
840
	struct tcphdr *th = tcp_hdr(skb);
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
	int length = (th->doff << 2) - sizeof (*th);
	int genhash;
	u8 *ptr;
	u8 newhash[16];

	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);

	/* If the TCP option is too short, we can short cut */
	if (length < TCPOLEN_MD5SIG)
		return hash_expected ? 1 : 0;

	/* parse options */
	ptr = (u8*)(th + 1);
	while (length > 0) {
		int opcode = *ptr++;
		int opsize;

		switch(opcode) {
		case TCPOPT_EOL:
			goto done_opts;
		case TCPOPT_NOP:
			length--;
			continue;
		default:
			opsize = *ptr++;
			if (opsize < 2 || opsize > length)
				goto done_opts;
			if (opcode == TCPOPT_MD5SIG) {
				hash_location = ptr;
				goto done_opts;
			}
		}
		ptr += opsize - 2;
		length -= opsize;
	}

done_opts:
	/* do we have a hash as expected? */
	if (!hash_expected) {
		if (!hash_location)
			return 0;
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash NOT expected but found "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}

	if (!hash_location) {
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash expected but NOT found "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}

	/* check the signature */
	genhash = tcp_v6_do_calc_md5_hash(newhash,
					  hash_expected,
					  &ip6h->saddr, &ip6h->daddr,
					  th, sk->sk_protocol,
					  skb->len);
	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash %s for "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       genhash ? "failed" : "mismatch",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}
	return 0;
}
#endif

924
static struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
L
Linus Torvalds 已提交
925
	.family		=	AF_INET6,
926
	.obj_size	=	sizeof(struct tcp6_request_sock),
L
Linus Torvalds 已提交
927
	.rtx_syn_ack	=	tcp_v6_send_synack,
928 929
	.send_ack	=	tcp_v6_reqsk_send_ack,
	.destructor	=	tcp_v6_reqsk_destructor,
L
Linus Torvalds 已提交
930 931 932
	.send_reset	=	tcp_v6_send_reset
};

933
#ifdef CONFIG_TCP_MD5SIG
934
static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
935 936
	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
};
937
#endif
938

939 940 941
static struct timewait_sock_ops tcp6_timewait_sock_ops = {
	.twsk_obj_size	= sizeof(struct tcp6_timewait_sock),
	.twsk_unique	= tcp_twsk_unique,
942
	.twsk_destructor= tcp_twsk_destructor,
943 944
};

945
static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
L
Linus Torvalds 已提交
946 947
{
	struct ipv6_pinfo *np = inet6_sk(sk);
948
	struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
949

950
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
L
Linus Torvalds 已提交
951
		th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,  0);
952
		skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
953
		skb->csum_offset = offsetof(struct tcphdr, check);
L
Linus Torvalds 已提交
954
	} else {
955 956
		th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
					    csum_partial((char *)th, th->doff<<2,
L
Linus Torvalds 已提交
957 958 959 960
							 skb->csum));
	}
}

961 962 963 964 965 966 967 968
static int tcp_v6_gso_send_check(struct sk_buff *skb)
{
	struct ipv6hdr *ipv6h;
	struct tcphdr *th;

	if (!pskb_may_pull(skb, sizeof(*th)))
		return -EINVAL;

969
	ipv6h = ipv6_hdr(skb);
970
	th = tcp_hdr(skb);
971 972 973 974

	th->check = 0;
	th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
				     IPPROTO_TCP, 0);
975
	skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
976
	skb->csum_offset = offsetof(struct tcphdr, check);
977
	skb->ip_summed = CHECKSUM_PARTIAL;
978 979
	return 0;
}
L
Linus Torvalds 已提交
980

981
static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
L
Linus Torvalds 已提交
982
{
983
	struct tcphdr *th = tcp_hdr(skb), *t1;
L
Linus Torvalds 已提交
984 985
	struct sk_buff *buff;
	struct flowi fl;
986 987 988 989
	int tot_len = sizeof(*th);
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
L
Linus Torvalds 已提交
990 991 992 993 994

	if (th->rst)
		return;

	if (!ipv6_unicast_destination(skb))
995
		return;
L
Linus Torvalds 已提交
996

997 998
#ifdef CONFIG_TCP_MD5SIG
	if (sk)
999
		key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
1000 1001 1002 1003 1004 1005 1006
	else
		key = NULL;

	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif

L
Linus Torvalds 已提交
1007 1008 1009 1010 1011
	/*
	 * We need to grab some memory, and put together an RST,
	 * and then put it into the queue to be sent.
	 */

1012
	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
L
Linus Torvalds 已提交
1013
			 GFP_ATOMIC);
1014 1015
	if (buff == NULL)
		return;
L
Linus Torvalds 已提交
1016

1017
	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
L
Linus Torvalds 已提交
1018

1019
	t1 = (struct tcphdr *) skb_push(buff, tot_len);
L
Linus Torvalds 已提交
1020 1021 1022 1023 1024

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
1025
	t1->doff = tot_len / 4;
L
Linus Torvalds 已提交
1026
	t1->rst = 1;
1027

L
Linus Torvalds 已提交
1028
	if(th->ack) {
1029
		t1->seq = th->ack_seq;
L
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1030 1031 1032 1033 1034 1035
	} else {
		t1->ack = 1;
		t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
				    + skb->len - (th->doff<<2));
	}

1036 1037
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
1038
		__be32 *opt = (__be32*)(t1 + 1);
1039 1040 1041 1042
		opt[0] = htonl((TCPOPT_NOP << 24) |
			       (TCPOPT_NOP << 16) |
			       (TCPOPT_MD5SIG << 8) |
			       TCPOLEN_MD5SIG);
1043 1044 1045 1046
		tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key,
					&ipv6_hdr(skb)->daddr,
					&ipv6_hdr(skb)->saddr,
					t1, IPPROTO_TCP, tot_len);
1047 1048 1049
	}
#endif

L
Linus Torvalds 已提交
1050 1051 1052
	buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);

	memset(&fl, 0, sizeof(fl));
1053 1054
	ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
L
Linus Torvalds 已提交
1055 1056 1057 1058 1059 1060

	t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
				    sizeof(*t1), IPPROTO_TCP,
				    buff->csum);

	fl.proto = IPPROTO_TCP;
1061
	fl.oif = inet6_iif(skb);
L
Linus Torvalds 已提交
1062 1063
	fl.fl_ip_dport = t1->dest;
	fl.fl_ip_sport = t1->source;
V
Venkat Yekkirala 已提交
1064
	security_skb_classify_flow(skb, &fl);
L
Linus Torvalds 已提交
1065 1066 1067 1068

	/* sk = NULL, but it is safe for now. RST socket required. */
	if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {

A
Arnaldo Carvalho de Melo 已提交
1069
		if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1070
			ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
A
Arnaldo Carvalho de Melo 已提交
1071 1072
			TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
			TCP_INC_STATS_BH(TCP_MIB_OUTRSTS);
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Linus Torvalds 已提交
1073
			return;
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Arnaldo Carvalho de Melo 已提交
1074
		}
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1075 1076 1077 1078 1079
	}

	kfree_skb(buff);
}

1080 1081
static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
			    struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
L
Linus Torvalds 已提交
1082
{
1083
	struct tcphdr *th = tcp_hdr(skb), *t1;
L
Linus Torvalds 已提交
1084 1085 1086
	struct sk_buff *buff;
	struct flowi fl;
	int tot_len = sizeof(struct tcphdr);
A
Al Viro 已提交
1087
	__be32 *topt;
1088 1089 1090 1091 1092 1093 1094
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
	struct tcp_md5sig_key tw_key;
#endif

#ifdef CONFIG_TCP_MD5SIG
	if (!tw && skb->sk) {
1095
		key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr);
1096 1097 1098 1099 1100 1101 1102 1103
	} else if (tw && tw->tw_md5_keylen) {
		tw_key.key = tw->tw_md5_key;
		tw_key.keylen = tw->tw_md5_keylen;
		key = &tw_key;
	} else {
		key = NULL;
	}
#endif
L
Linus Torvalds 已提交
1104 1105

	if (ts)
1106
		tot_len += TCPOLEN_TSTAMP_ALIGNED;
1107 1108 1109 1110
#ifdef CONFIG_TCP_MD5SIG
	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif
L
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1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129

	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
			 GFP_ATOMIC);
	if (buff == NULL)
		return;

	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);

	t1 = (struct tcphdr *) skb_push(buff,tot_len);

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
	t1->doff = tot_len/4;
	t1->seq = htonl(seq);
	t1->ack_seq = htonl(ack);
	t1->ack = 1;
	t1->window = htons(win);
1130

A
Al Viro 已提交
1131
	topt = (__be32 *)(t1 + 1);
1132

L
Linus Torvalds 已提交
1133
	if (ts) {
1134 1135 1136 1137
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
		*topt++ = htonl(tcp_time_stamp);
		*topt = htonl(ts);
L
Linus Torvalds 已提交
1138 1139
	}

1140 1141 1142 1143
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1144 1145 1146 1147
		tcp_v6_do_calc_md5_hash((__u8 *)topt, key,
					&ipv6_hdr(skb)->daddr,
					&ipv6_hdr(skb)->saddr,
					t1, IPPROTO_TCP, tot_len);
1148 1149 1150
	}
#endif

L
Linus Torvalds 已提交
1151 1152 1153
	buff->csum = csum_partial((char *)t1, tot_len, 0);

	memset(&fl, 0, sizeof(fl));
1154 1155
	ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
L
Linus Torvalds 已提交
1156 1157 1158 1159 1160 1161

	t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
				    tot_len, IPPROTO_TCP,
				    buff->csum);

	fl.proto = IPPROTO_TCP;
1162
	fl.oif = inet6_iif(skb);
L
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1163 1164
	fl.fl_ip_dport = t1->dest;
	fl.fl_ip_sport = t1->source;
V
Venkat Yekkirala 已提交
1165
	security_skb_classify_flow(skb, &fl);
L
Linus Torvalds 已提交
1166 1167

	if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
A
Arnaldo Carvalho de Melo 已提交
1168
		if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1169
			ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
A
Arnaldo Carvalho de Melo 已提交
1170
			TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
L
Linus Torvalds 已提交
1171
			return;
A
Arnaldo Carvalho de Melo 已提交
1172
		}
L
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1173 1174 1175 1176 1177 1178 1179
	}

	kfree_skb(buff);
}

static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
1180
	struct inet_timewait_sock *tw = inet_twsk(sk);
1181
	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
L
Linus Torvalds 已提交
1182

1183
	tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1184 1185
			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
			tcptw->tw_ts_recent);
L
Linus Torvalds 已提交
1186

1187
	inet_twsk_put(tw);
L
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1188 1189
}

1190
static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
L
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1191
{
1192
	tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent);
L
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1193 1194 1195 1196 1197
}


static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
1198
	struct request_sock *req, **prev;
1199
	const struct tcphdr *th = tcp_hdr(skb);
L
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1200 1201 1202
	struct sock *nsk;

	/* Find possible connection requests. */
1203
	req = inet6_csk_search_req(sk, &prev, th->source,
1204 1205
				   &ipv6_hdr(skb)->saddr,
				   &ipv6_hdr(skb)->daddr, inet6_iif(skb));
L
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1206 1207 1208
	if (req)
		return tcp_check_req(sk, skb, req, prev);

1209 1210
	nsk = __inet6_lookup_established(&tcp_hashinfo, &ipv6_hdr(skb)->saddr,
					 th->source, &ipv6_hdr(skb)->daddr,
1211
					 ntohs(th->dest), inet6_iif(skb));
L
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1212 1213 1214 1215 1216 1217

	if (nsk) {
		if (nsk->sk_state != TCP_TIME_WAIT) {
			bh_lock_sock(nsk);
			return nsk;
		}
1218
		inet_twsk_put(inet_twsk(nsk));
L
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1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
		return NULL;
	}

#if 0 /*def CONFIG_SYN_COOKIES*/
	if (!th->rst && !th->syn && th->ack)
		sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
#endif
	return sk;
}

/* FIXME: this is substantially similar to the ipv4 code.
 * Can some kind of merge be done? -- erics
 */
static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
1234
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1235 1236 1237
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_options_received tmp_opt;
	struct tcp_sock *tp = tcp_sk(sk);
1238
	struct request_sock *req = NULL;
L
Linus Torvalds 已提交
1239 1240 1241 1242 1243 1244
	__u32 isn = TCP_SKB_CB(skb)->when;

	if (skb->protocol == htons(ETH_P_IP))
		return tcp_v4_conn_request(sk, skb);

	if (!ipv6_unicast_destination(skb))
1245
		goto drop;
L
Linus Torvalds 已提交
1246 1247

	/*
1248
	 *	There are no SYN attacks on IPv6, yet...
L
Linus Torvalds 已提交
1249
	 */
1250
	if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
L
Linus Torvalds 已提交
1251 1252
		if (net_ratelimit())
			printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n");
1253
		goto drop;
L
Linus Torvalds 已提交
1254 1255
	}

1256
	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
L
Linus Torvalds 已提交
1257 1258
		goto drop;

1259
	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
L
Linus Torvalds 已提交
1260 1261 1262
	if (req == NULL)
		goto drop;

1263 1264 1265 1266
#ifdef CONFIG_TCP_MD5SIG
	tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
#endif

L
Linus Torvalds 已提交
1267 1268 1269 1270 1271 1272 1273 1274 1275
	tcp_clear_options(&tmp_opt);
	tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
	tmp_opt.user_mss = tp->rx_opt.user_mss;

	tcp_parse_options(skb, &tmp_opt, 0);

	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
	tcp_openreq_init(req, &tmp_opt, skb);

1276
	treq = inet6_rsk(req);
1277 1278
	ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1279
	TCP_ECN_create_request(req, tcp_hdr(skb));
1280
	treq->pktopts = NULL;
L
Linus Torvalds 已提交
1281
	if (ipv6_opt_accepted(sk, skb) ||
1282 1283
	    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
	    np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
L
Linus Torvalds 已提交
1284
		atomic_inc(&skb->users);
1285
		treq->pktopts = skb;
L
Linus Torvalds 已提交
1286
	}
1287
	treq->iif = sk->sk_bound_dev_if;
L
Linus Torvalds 已提交
1288 1289 1290

	/* So that link locals have meaning */
	if (!sk->sk_bound_dev_if &&
1291
	    ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1292
		treq->iif = inet6_iif(skb);
L
Linus Torvalds 已提交
1293

1294
	if (isn == 0)
1295
		isn = tcp_v6_init_sequence(skb);
L
Linus Torvalds 已提交
1296

1297
	tcp_rsk(req)->snt_isn = isn;
L
Linus Torvalds 已提交
1298

1299 1300
	security_inet_conn_request(sk, skb, req);

L
Linus Torvalds 已提交
1301 1302 1303
	if (tcp_v6_send_synack(sk, req, NULL))
		goto drop;

1304
	inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
L
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1305 1306 1307 1308
	return 0;

drop:
	if (req)
1309
		reqsk_free(req);
L
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1310 1311 1312 1313 1314

	return 0; /* don't send reset */
}

static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1315
					  struct request_sock *req,
L
Linus Torvalds 已提交
1316 1317
					  struct dst_entry *dst)
{
1318
	struct inet6_request_sock *treq = inet6_rsk(req);
L
Linus Torvalds 已提交
1319 1320 1321 1322 1323 1324
	struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
	struct tcp6_sock *newtcp6sk;
	struct inet_sock *newinet;
	struct tcp_sock *newtp;
	struct sock *newsk;
	struct ipv6_txoptions *opt;
1325 1326 1327
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
L
Linus Torvalds 已提交
1328 1329 1330 1331 1332 1333 1334 1335

	if (skb->protocol == htons(ETH_P_IP)) {
		/*
		 *	v6 mapped
		 */

		newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);

1336
		if (newsk == NULL)
L
Linus Torvalds 已提交
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
			return NULL;

		newtcp6sk = (struct tcp6_sock *)newsk;
		inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

		newinet = inet_sk(newsk);
		newnp = inet6_sk(newsk);
		newtp = tcp_sk(newsk);

		memcpy(newnp, np, sizeof(struct ipv6_pinfo));

		ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
			      newinet->daddr);

		ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
			      newinet->saddr);

		ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);

1356
		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
1357
		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1358 1359 1360 1361
#ifdef CONFIG_TCP_MD5SIG
		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

L
Linus Torvalds 已提交
1362 1363
		newnp->pktoptions  = NULL;
		newnp->opt	   = NULL;
1364
		newnp->mcast_oif   = inet6_iif(skb);
1365
		newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1366

1367 1368 1369 1370
		/*
		 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
		 * here, tcp_create_openreq_child now does this for us, see the comment in
		 * that function for the gory details. -acme
L
Linus Torvalds 已提交
1371 1372 1373
		 */

		/* It is tricky place. Until this moment IPv4 tcp
1374
		   worked with IPv6 icsk.icsk_af_ops.
L
Linus Torvalds 已提交
1375 1376
		   Sync it now.
		 */
1377
		tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
L
Linus Torvalds 已提交
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392

		return newsk;
	}

	opt = np->opt;

	if (sk_acceptq_is_full(sk))
		goto out_overflow;

	if (dst == NULL) {
		struct in6_addr *final_p = NULL, final;
		struct flowi fl;

		memset(&fl, 0, sizeof(fl));
		fl.proto = IPPROTO_TCP;
1393
		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
L
Linus Torvalds 已提交
1394 1395 1396 1397 1398 1399
		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;
		}
1400
		ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
L
Linus Torvalds 已提交
1401
		fl.oif = sk->sk_bound_dev_if;
1402
		fl.fl_ip_dport = inet_rsk(req)->rmt_port;
L
Linus Torvalds 已提交
1403
		fl.fl_ip_sport = inet_sk(sk)->sport;
1404
		security_req_classify_flow(req, &fl);
L
Linus Torvalds 已提交
1405 1406 1407 1408 1409 1410 1411 1412 1413

		if (ip6_dst_lookup(sk, &dst, &fl))
			goto out;

		if (final_p)
			ipv6_addr_copy(&fl.fl6_dst, final_p);

		if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
			goto out;
1414
	}
L
Linus Torvalds 已提交
1415 1416 1417 1418 1419

	newsk = tcp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
		goto out;

1420 1421 1422 1423 1424
	/*
	 * No need to charge this sock to the relevant IPv6 refcnt debug socks
	 * count here, tcp_create_openreq_child now does this for us, see the
	 * comment in that function for the gory details. -acme
	 */
L
Linus Torvalds 已提交
1425

1426
	newsk->sk_gso_type = SKB_GSO_TCPV6;
1427
	__ip6_dst_store(newsk, dst, NULL, NULL);
L
Linus Torvalds 已提交
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437

	newtcp6sk = (struct tcp6_sock *)newsk;
	inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

	newtp = tcp_sk(newsk);
	newinet = inet_sk(newsk);
	newnp = inet6_sk(newsk);

	memcpy(newnp, np, sizeof(struct ipv6_pinfo));

1438 1439 1440 1441
	ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
	ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
	ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
	newsk->sk_bound_dev_if = treq->iif;
L
Linus Torvalds 已提交
1442

1443
	/* Now IPv6 options...
L
Linus Torvalds 已提交
1444 1445 1446 1447

	   First: no IPv4 options.
	 */
	newinet->opt = NULL;
1448
	newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1449 1450 1451 1452 1453 1454

	/* Clone RX bits */
	newnp->rxopt.all = np->rxopt.all;

	/* Clone pktoptions received with SYN */
	newnp->pktoptions = NULL;
1455 1456 1457 1458
	if (treq->pktopts != NULL) {
		newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
		kfree_skb(treq->pktopts);
		treq->pktopts = NULL;
L
Linus Torvalds 已提交
1459 1460 1461 1462
		if (newnp->pktoptions)
			skb_set_owner_r(newnp->pktoptions, newsk);
	}
	newnp->opt	  = NULL;
1463
	newnp->mcast_oif  = inet6_iif(skb);
1464
	newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477

	/* Clone native IPv6 options from listening socket (if any)

	   Yes, keeping reference count would be much more clever,
	   but we make one more one thing there: reattach optmem
	   to newsk.
	 */
	if (opt) {
		newnp->opt = ipv6_dup_options(newsk, opt);
		if (opt != np->opt)
			sock_kfree_s(sk, opt, opt->tot_len);
	}

1478
	inet_csk(newsk)->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
1479
	if (newnp->opt)
1480 1481
		inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
						     newnp->opt->opt_flen);
L
Linus Torvalds 已提交
1482

J
John Heffner 已提交
1483
	tcp_mtup_init(newsk);
L
Linus Torvalds 已提交
1484 1485 1486 1487 1488 1489
	tcp_sync_mss(newsk, dst_mtu(dst));
	newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
	tcp_initialize_rcv_mss(newsk);

	newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;

1490 1491 1492 1493 1494 1495 1496 1497
#ifdef CONFIG_TCP_MD5SIG
	/* Copy over the MD5 key from the original socket */
	if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
		/* We're using one, so create a matching key
		 * on the newsk structure. If we fail to get
		 * memory, then we end up not copying the key
		 * across. Shucks.
		 */
A
Arnaldo Carvalho de Melo 已提交
1498 1499
		char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
		if (newkey != NULL)
1500 1501 1502 1503 1504
			tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
					  newkey, key->keylen);
	}
#endif

1505
	__inet6_hash(&tcp_hashinfo, newsk);
1506
	inet_inherit_port(&tcp_hashinfo, sk, newsk);
L
Linus Torvalds 已提交
1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519

	return newsk;

out_overflow:
	NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
out:
	NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
	if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
	return NULL;
}

1520
static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
L
Linus Torvalds 已提交
1521
{
1522
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
1523
		if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
1524
				  &ipv6_hdr(skb)->daddr, skb->csum)) {
1525
			skb->ip_summed = CHECKSUM_UNNECESSARY;
L
Linus Torvalds 已提交
1526
			return 0;
1527
		}
L
Linus Torvalds 已提交
1528
	}
1529

1530
	skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
1531 1532
					      &ipv6_hdr(skb)->saddr,
					      &ipv6_hdr(skb)->daddr, 0));
1533

L
Linus Torvalds 已提交
1534
	if (skb->len <= 76) {
1535
		return __skb_checksum_complete(skb);
L
Linus Torvalds 已提交
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564
	}
	return 0;
}

/* The socket must have it's spinlock held when we get
 * here.
 *
 * We have a potential double-lock case here, so even when
 * doing backlog processing we use the BH locking scheme.
 * This is because we cannot sleep with the original spinlock
 * held.
 */
static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp;
	struct sk_buff *opt_skb = NULL;

	/* Imagine: socket is IPv6. IPv4 packet arrives,
	   goes to IPv4 receive handler and backlogged.
	   From backlog it always goes here. Kerboom...
	   Fortunately, tcp_rcv_established and rcv_established
	   handle them correctly, but it is not case with
	   tcp_v6_hnd_req and tcp_v6_send_reset().   --ANK
	 */

	if (skb->protocol == htons(ETH_P_IP))
		return tcp_v4_do_rcv(sk, skb);

1565 1566 1567 1568 1569
#ifdef CONFIG_TCP_MD5SIG
	if (tcp_v6_inbound_md5_hash (sk, skb))
		goto discard;
#endif

1570
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588
		goto discard;

	/*
	 *	socket locking is here for SMP purposes as backlog rcv
	 *	is currently called with bh processing disabled.
	 */

	/* Do Stevens' IPV6_PKTOPTIONS.

	   Yes, guys, it is the only place in our code, where we
	   may make it not affecting IPv4.
	   The rest of code is protocol independent,
	   and I do not like idea to uglify IPv4.

	   Actually, all the idea behind IPV6_PKTOPTIONS
	   looks not very well thought. For now we latch
	   options, received in the last packet, enqueued
	   by tcp. Feel free to propose better solution.
1589
					       --ANK (980728)
L
Linus Torvalds 已提交
1590 1591 1592 1593 1594 1595
	 */
	if (np->rxopt.all)
		opt_skb = skb_clone(skb, GFP_ATOMIC);

	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
		TCP_CHECK_TIMER(sk);
1596
		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1597 1598 1599 1600 1601 1602 1603
			goto reset;
		TCP_CHECK_TIMER(sk);
		if (opt_skb)
			goto ipv6_pktoptions;
		return 0;
	}

1604
	if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
L
Linus Torvalds 已提交
1605 1606
		goto csum_err;

1607
	if (sk->sk_state == TCP_LISTEN) {
L
Linus Torvalds 已提交
1608 1609 1610 1611 1612 1613 1614 1615 1616
		struct sock *nsk = tcp_v6_hnd_req(sk, skb);
		if (!nsk)
			goto discard;

		/*
		 * Queue it on the new socket if the new socket is active,
		 * otherwise we just shortcircuit this and continue with
		 * the new socket..
		 */
1617
		if(nsk != sk) {
L
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1618 1619 1620 1621 1622 1623 1624 1625 1626
			if (tcp_child_process(sk, nsk, skb))
				goto reset;
			if (opt_skb)
				__kfree_skb(opt_skb);
			return 0;
		}
	}

	TCP_CHECK_TIMER(sk);
1627
	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1628 1629 1630 1631 1632 1633 1634
		goto reset;
	TCP_CHECK_TIMER(sk);
	if (opt_skb)
		goto ipv6_pktoptions;
	return 0;

reset:
1635
	tcp_v6_send_reset(sk, skb);
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1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
discard:
	if (opt_skb)
		__kfree_skb(opt_skb);
	kfree_skb(skb);
	return 0;
csum_err:
	TCP_INC_STATS_BH(TCP_MIB_INERRS);
	goto discard;


ipv6_pktoptions:
	/* Do you ask, what is it?

	   1. skb was enqueued by tcp.
	   2. skb is added to tail of read queue, rather than out of order.
	   3. socket is not in passive state.
	   4. Finally, it really contains options, which user wants to receive.
	 */
	tp = tcp_sk(sk);
	if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
	    !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1657
		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1658
			np->mcast_oif = inet6_iif(opt_skb);
1659
		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1660
			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
L
Linus Torvalds 已提交
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
		if (ipv6_opt_accepted(sk, opt_skb)) {
			skb_set_owner_r(opt_skb, sk);
			opt_skb = xchg(&np->pktoptions, opt_skb);
		} else {
			__kfree_skb(opt_skb);
			opt_skb = xchg(&np->pktoptions, NULL);
		}
	}

	if (opt_skb)
		kfree_skb(opt_skb);
	return 0;
}

1675
static int tcp_v6_rcv(struct sk_buff *skb)
L
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1676
{
1677
	struct tcphdr *th;
L
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1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
	struct sock *sk;
	int ret;

	if (skb->pkt_type != PACKET_HOST)
		goto discard_it;

	/*
	 *	Count it even if it's bad.
	 */
	TCP_INC_STATS_BH(TCP_MIB_INSEGS);

	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
		goto discard_it;

1692
	th = tcp_hdr(skb);
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1693 1694 1695 1696 1697 1698

	if (th->doff < sizeof(struct tcphdr)/4)
		goto bad_packet;
	if (!pskb_may_pull(skb, th->doff*4))
		goto discard_it;

1699
	if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
L
Linus Torvalds 已提交
1700 1701
		goto bad_packet;

1702
	th = tcp_hdr(skb);
L
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1703 1704 1705 1706 1707
	TCP_SKB_CB(skb)->seq = ntohl(th->seq);
	TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
				    skb->len - th->doff*4);
	TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
	TCP_SKB_CB(skb)->when = 0;
1708
	TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
L
Linus Torvalds 已提交
1709 1710
	TCP_SKB_CB(skb)->sacked = 0;

1711 1712
	sk = __inet6_lookup(&tcp_hashinfo, &ipv6_hdr(skb)->saddr, th->source,
			    &ipv6_hdr(skb)->daddr, ntohs(th->dest),
1713
			    inet6_iif(skb));
L
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1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724

	if (!sk)
		goto no_tcp_socket;

process:
	if (sk->sk_state == TCP_TIME_WAIT)
		goto do_time_wait;

	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto discard_and_relse;

1725
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1726 1727 1728 1729
		goto discard_and_relse;

	skb->dev = NULL;

1730
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1731 1732
	ret = 0;
	if (!sock_owned_by_user(sk)) {
C
Chris Leech 已提交
1733
#ifdef CONFIG_NET_DMA
1734
		struct tcp_sock *tp = tcp_sk(sk);
1735 1736
		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
			tp->ucopy.dma_chan = get_softnet_dma();
1737 1738 1739
		if (tp->ucopy.dma_chan)
			ret = tcp_v6_do_rcv(sk, skb);
		else
C
Chris Leech 已提交
1740 1741 1742 1743 1744
#endif
		{
			if (!tcp_prequeue(sk, skb))
				ret = tcp_v6_do_rcv(sk, skb);
		}
L
Linus Torvalds 已提交
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759
	} else
		sk_add_backlog(sk, skb);
	bh_unlock_sock(sk);

	sock_put(sk);
	return ret ? -1 : 0;

no_tcp_socket:
	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
		goto discard_it;

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
bad_packet:
		TCP_INC_STATS_BH(TCP_MIB_INERRS);
	} else {
1760
		tcp_v6_send_reset(NULL, skb);
L
Linus Torvalds 已提交
1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
	}

discard_it:

	/*
	 *	Discard frame
	 */

	kfree_skb(skb);
	return 0;

discard_and_relse:
	sock_put(sk);
	goto discard_it;

do_time_wait:
	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1778
		inet_twsk_put(inet_twsk(sk));
L
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1779 1780 1781 1782 1783
		goto discard_it;
	}

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
		TCP_INC_STATS_BH(TCP_MIB_INERRS);
1784
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1785 1786 1787
		goto discard_it;
	}

1788
	switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
L
Linus Torvalds 已提交
1789 1790 1791 1792
	case TCP_TW_SYN:
	{
		struct sock *sk2;

1793
		sk2 = inet6_lookup_listener(&tcp_hashinfo,
1794
					    &ipv6_hdr(skb)->daddr,
1795
					    ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1796
		if (sk2 != NULL) {
1797 1798 1799
			struct inet_timewait_sock *tw = inet_twsk(sk);
			inet_twsk_deschedule(tw, &tcp_death_row);
			inet_twsk_put(tw);
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1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820
			sk = sk2;
			goto process;
		}
		/* Fall through to ACK */
	}
	case TCP_TW_ACK:
		tcp_v6_timewait_ack(sk, skb);
		break;
	case TCP_TW_RST:
		goto no_tcp_socket;
	case TCP_TW_SUCCESS:;
	}
	goto discard_it;
}

static int tcp_v6_remember_stamp(struct sock *sk)
{
	/* Alas, not yet... */
	return 0;
}

1821
static struct inet_connection_sock_af_ops ipv6_specific = {
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
	.queue_xmit	   = inet6_csk_xmit,
	.send_check	   = tcp_v6_send_check,
	.rebuild_header	   = inet6_sk_rebuild_header,
	.conn_request	   = tcp_v6_conn_request,
	.syn_recv_sock	   = tcp_v6_syn_recv_sock,
	.remember_stamp	   = tcp_v6_remember_stamp,
	.net_header_len	   = sizeof(struct ipv6hdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1833
#ifdef CONFIG_COMPAT
1834 1835
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1836
#endif
L
Linus Torvalds 已提交
1837 1838
};

1839
#ifdef CONFIG_TCP_MD5SIG
1840
static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1841 1842 1843 1844 1845
	.md5_lookup	=	tcp_v6_md5_lookup,
	.calc_md5_hash	=	tcp_v6_calc_md5_hash,
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1846
#endif
1847

L
Linus Torvalds 已提交
1848 1849 1850 1851
/*
 *	TCP over IPv4 via INET6 API
 */

1852
static struct inet_connection_sock_af_ops ipv6_mapped = {
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863
	.queue_xmit	   = ip_queue_xmit,
	.send_check	   = tcp_v4_send_check,
	.rebuild_header	   = inet_sk_rebuild_header,
	.conn_request	   = tcp_v6_conn_request,
	.syn_recv_sock	   = tcp_v6_syn_recv_sock,
	.remember_stamp	   = tcp_v4_remember_stamp,
	.net_header_len	   = sizeof(struct iphdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1864
#ifdef CONFIG_COMPAT
1865 1866
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1867
#endif
L
Linus Torvalds 已提交
1868 1869
};

1870
#ifdef CONFIG_TCP_MD5SIG
1871
static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1872 1873 1874 1875 1876
	.md5_lookup	=	tcp_v4_md5_lookup,
	.calc_md5_hash	=	tcp_v4_calc_md5_hash,
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1877
#endif
1878

L
Linus Torvalds 已提交
1879 1880 1881 1882 1883
/* NOTE: A lot of things set to zero explicitly by call to
 *       sk_alloc() so need not be done here.
 */
static int tcp_v6_init_sock(struct sock *sk)
{
1884
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
1885 1886 1887 1888 1889 1890
	struct tcp_sock *tp = tcp_sk(sk);

	skb_queue_head_init(&tp->out_of_order_queue);
	tcp_init_xmit_timers(sk);
	tcp_prequeue_init(tp);

1891
	icsk->icsk_rto = TCP_TIMEOUT_INIT;
L
Linus Torvalds 已提交
1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
	tp->mdev = TCP_TIMEOUT_INIT;

	/* So many TCP implementations out there (incorrectly) count the
	 * initial SYN frame in their delayed-ACK and congestion control
	 * algorithms that we must have the following bandaid to talk
	 * efficiently to them.  -DaveM
	 */
	tp->snd_cwnd = 2;

	/* See draft-stevens-tcpca-spec-01 for discussion of the
	 * initialization of these values.
	 */
	tp->snd_ssthresh = 0x7fffffff;
	tp->snd_cwnd_clamp = ~0;
1906
	tp->mss_cache = 536;
L
Linus Torvalds 已提交
1907 1908 1909 1910 1911

	tp->reordering = sysctl_tcp_reordering;

	sk->sk_state = TCP_CLOSE;

1912
	icsk->icsk_af_ops = &ipv6_specific;
1913
	icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1914
	icsk->icsk_sync_mss = tcp_sync_mss;
L
Linus Torvalds 已提交
1915 1916 1917
	sk->sk_write_space = sk_stream_write_space;
	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);

1918 1919 1920 1921
#ifdef CONFIG_TCP_MD5SIG
	tp->af_specific = &tcp_sock_ipv6_specific;
#endif

L
Linus Torvalds 已提交
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931
	sk->sk_sndbuf = sysctl_tcp_wmem[1];
	sk->sk_rcvbuf = sysctl_tcp_rmem[1];

	atomic_inc(&tcp_sockets_allocated);

	return 0;
}

static int tcp_v6_destroy_sock(struct sock *sk)
{
1932 1933 1934 1935 1936
#ifdef CONFIG_TCP_MD5SIG
	/* Clean up the MD5 key list */
	if (tcp_sk(sk)->md5sig_info)
		tcp_v6_clear_md5_list(sk);
#endif
L
Linus Torvalds 已提交
1937 1938 1939 1940
	tcp_v4_destroy_sock(sk);
	return inet6_destroy_sock(sk);
}

1941
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
1942
/* Proc filesystem TCPv6 sock list dumping. */
1943
static void get_openreq6(struct seq_file *seq,
1944
			 struct sock *sk, struct request_sock *req, int i, int uid)
L
Linus Torvalds 已提交
1945 1946
{
	int ttd = req->expires - jiffies;
1947 1948
	struct in6_addr *src = &inet6_rsk(req)->loc_addr;
	struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
L
Linus Torvalds 已提交
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961

	if (ttd < 0)
		ttd = 0;

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
		   i,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3],
		   ntohs(inet_sk(sk)->sport),
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3],
1962
		   ntohs(inet_rsk(req)->rmt_port),
L
Linus Torvalds 已提交
1963 1964
		   TCP_SYN_RECV,
		   0,0, /* could print option size, but that is af dependent. */
1965 1966
		   1,   /* timers active (only the expire timer) */
		   jiffies_to_clock_t(ttd),
L
Linus Torvalds 已提交
1967 1968
		   req->retrans,
		   uid,
1969
		   0,  /* non standard timer */
L
Linus Torvalds 已提交
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
		   0, /* open_requests have no inode */
		   0, req);
}

static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
{
	struct in6_addr *dest, *src;
	__u16 destp, srcp;
	int timer_active;
	unsigned long timer_expires;
	struct inet_sock *inet = inet_sk(sp);
	struct tcp_sock *tp = tcp_sk(sp);
1982
	const struct inet_connection_sock *icsk = inet_csk(sp);
L
Linus Torvalds 已提交
1983 1984 1985 1986 1987 1988
	struct ipv6_pinfo *np = inet6_sk(sp);

	dest  = &np->daddr;
	src   = &np->rcv_saddr;
	destp = ntohs(inet->dport);
	srcp  = ntohs(inet->sport);
1989 1990

	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
L
Linus Torvalds 已提交
1991
		timer_active	= 1;
1992 1993
		timer_expires	= icsk->icsk_timeout;
	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
L
Linus Torvalds 已提交
1994
		timer_active	= 4;
1995
		timer_expires	= icsk->icsk_timeout;
L
Linus Torvalds 已提交
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
	} else if (timer_pending(&sp->sk_timer)) {
		timer_active	= 2;
		timer_expires	= sp->sk_timer.expires;
	} else {
		timer_active	= 0;
		timer_expires = jiffies;
	}

	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 %u %u %u %u %d\n",
		   i,
		   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,
2012
		   sp->sk_state,
2013 2014
		   tp->write_seq-tp->snd_una,
		   (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
L
Linus Torvalds 已提交
2015 2016
		   timer_active,
		   jiffies_to_clock_t(timer_expires - jiffies),
2017
		   icsk->icsk_retransmits,
L
Linus Torvalds 已提交
2018
		   sock_i_uid(sp),
2019
		   icsk->icsk_probes_out,
L
Linus Torvalds 已提交
2020 2021
		   sock_i_ino(sp),
		   atomic_read(&sp->sk_refcnt), sp,
2022 2023 2024
		   icsk->icsk_rto,
		   icsk->icsk_ack.ato,
		   (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
L
Linus Torvalds 已提交
2025 2026 2027 2028
		   tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
		   );
}

2029
static void get_timewait6_sock(struct seq_file *seq,
2030
			       struct inet_timewait_sock *tw, int i)
L
Linus Torvalds 已提交
2031 2032 2033
{
	struct in6_addr *dest, *src;
	__u16 destp, srcp;
2034
	struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
L
Linus Torvalds 已提交
2035 2036 2037 2038 2039
	int ttd = tw->tw_ttd - jiffies;

	if (ttd < 0)
		ttd = 0;

2040 2041
	dest = &tw6->tw_v6_daddr;
	src  = &tw6->tw_v6_rcv_saddr;
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	destp = ntohs(tw->tw_dport);
	srcp  = ntohs(tw->tw_sport);

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
		   i,
		   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,
		   tw->tw_substate, 0, 0,
		   3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
		   atomic_read(&tw->tw_refcnt), tw);
}

static int tcp6_seq_show(struct seq_file *seq, void *v)
{
	struct tcp_iter_state *st;

	if (v == SEQ_START_TOKEN) {
		seq_puts(seq,
			 "  sl  "
			 "local_address                         "
			 "remote_address                        "
			 "st tx_queue rx_queue tr tm->when retrnsmt"
			 "   uid  timeout inode\n");
		goto out;
	}
	st = seq->private;

	switch (st->state) {
	case TCP_SEQ_STATE_LISTENING:
	case TCP_SEQ_STATE_ESTABLISHED:
		get_tcp6_sock(seq, v, st->num);
		break;
	case TCP_SEQ_STATE_OPENREQ:
		get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
		break;
	case TCP_SEQ_STATE_TIME_WAIT:
		get_timewait6_sock(seq, v, st->num);
		break;
	}
out:
	return 0;
}

static struct file_operations tcp6_seq_fops;
static struct tcp_seq_afinfo tcp6_seq_afinfo = {
	.owner		= THIS_MODULE,
	.name		= "tcp6",
	.family		= AF_INET6,
	.seq_show	= tcp6_seq_show,
	.seq_fops	= &tcp6_seq_fops,
};

int __init tcp6_proc_init(void)
{
	return tcp_proc_register(&tcp6_seq_afinfo);
}

void tcp6_proc_exit(void)
{
	tcp_proc_unregister(&tcp6_seq_afinfo);
}
#endif

struct proto tcpv6_prot = {
	.name			= "TCPv6",
	.owner			= THIS_MODULE,
	.close			= tcp_close,
	.connect		= tcp_v6_connect,
	.disconnect		= tcp_disconnect,
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	.accept			= inet_csk_accept,
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	.ioctl			= tcp_ioctl,
	.init			= tcp_v6_init_sock,
	.destroy		= tcp_v6_destroy_sock,
	.shutdown		= tcp_shutdown,
	.setsockopt		= tcp_setsockopt,
	.getsockopt		= tcp_getsockopt,
	.recvmsg		= tcp_recvmsg,
	.backlog_rcv		= tcp_v6_do_rcv,
	.hash			= tcp_v6_hash,
	.unhash			= tcp_unhash,
	.get_port		= tcp_v6_get_port,
	.enter_memory_pressure	= tcp_enter_memory_pressure,
	.sockets_allocated	= &tcp_sockets_allocated,
	.memory_allocated	= &tcp_memory_allocated,
	.memory_pressure	= &tcp_memory_pressure,
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	.orphan_count		= &tcp_orphan_count,
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	.sysctl_mem		= sysctl_tcp_mem,
	.sysctl_wmem		= sysctl_tcp_wmem,
	.sysctl_rmem		= sysctl_tcp_rmem,
	.max_header		= MAX_TCP_HEADER,
	.obj_size		= sizeof(struct tcp6_sock),
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	.twsk_prot		= &tcp6_timewait_sock_ops,
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	.rsk_prot		= &tcp6_request_sock_ops,
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#ifdef CONFIG_COMPAT
	.compat_setsockopt	= compat_tcp_setsockopt,
	.compat_getsockopt	= compat_tcp_getsockopt,
#endif
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};

static struct inet6_protocol tcpv6_protocol = {
	.handler	=	tcp_v6_rcv,
	.err_handler	=	tcp_v6_err,
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	.gso_send_check	=	tcp_v6_gso_send_check,
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	.gso_segment	=	tcp_tso_segment,
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	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};

static struct inet_protosw tcpv6_protosw = {
	.type		=	SOCK_STREAM,
	.protocol	=	IPPROTO_TCP,
	.prot		=	&tcpv6_prot,
	.ops		=	&inet6_stream_ops,
	.capability	=	-1,
	.no_check	=	0,
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	.flags		=	INET_PROTOSW_PERMANENT |
				INET_PROTOSW_ICSK,
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};

void __init tcpv6_init(void)
{
	/* register inet6 protocol */
	if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0)
		printk(KERN_ERR "tcpv6_init: Could not register protocol\n");
	inet6_register_protosw(&tcpv6_protosw);
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	if (inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6, SOCK_RAW,
				     IPPROTO_TCP) < 0)
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		panic("Failed to create the TCPv6 control socket.\n");
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}