tcp_ipv6.c 55.9 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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 *
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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.
 */

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#include <linux/bottom_half.h>
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#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>
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#include <linux/slab.h>
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#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 <net/netdma.h>
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#include <net/inet_common.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>

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 sock *sk, struct sk_buff *skb,
				      struct request_sock *req);
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static int	tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
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static void	__tcp_v6_send_check(struct sk_buff *skb,
				    struct in6_addr *saddr,
				    struct in6_addr *daddr);
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static const struct inet_connection_sock_af_ops ipv6_mapped;
static const struct inet_connection_sock_af_ops ipv6_specific;
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#ifdef CONFIG_TCP_MD5SIG
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static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
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#else
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
						   struct in6_addr *addr)
{
	return NULL;
}
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#endif
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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(sk, NULL);
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		local_bh_enable();
	}
}

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static __inline__ __sum16 tcp_v6_check(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);
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	struct in6_addr *saddr = NULL, *final_p, final;
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	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;
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	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 {
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			ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
			ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
					       &np->rcv_saddr);
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		}

		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;
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	fl.mark = sk->sk_mark;
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	fl.fl_ip_dport = usin->sin6_port;
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	fl.fl_ip_sport = inet->inet_sport;
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	final_p = fl6_update_dst(&fl, np->opt, &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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	err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
	if (err < 0) {
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		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);
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	inet->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);

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	inet->inet_dport = usin->sin6_port;
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	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,
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							     inet->inet_sport,
							     inet->inet_dport);
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	err = tcp_connect(sk);
	if (err)
		goto late_failure;

	return 0;

late_failure:
	tcp_set_state(sk, TCP_CLOSE);
	__sk_dst_reset(sk);
failure:
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	inet->inet_dport = 0;
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	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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		u8 type, u8 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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	struct net *net = dev_net(skb->dev);
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	sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
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			th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
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	if (sk == NULL) {
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		ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
				   ICMP6_MIB_INERRORS);
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		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))
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		NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
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	if (sk->sk_state == TCP_CLOSE)
		goto out;

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	if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
		goto out;
	}

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	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)) {
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		NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
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		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;
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			fl.mark = sk->sk_mark;
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			fl.fl_ip_dport = inet->inet_dport;
			fl.fl_ip_sport = inet->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;
			}

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			if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) {
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				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.
		 */
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		WARN_ON(req->sk != NULL);
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		if (seq != tcp_rsk(req)->snt_isn) {
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			NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
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			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,
			      struct request_values *rvp)
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{
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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;
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	struct in6_addr * final_p, final;
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	struct flowi fl;
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	struct dst_entry *dst;
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	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;
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	fl.mark = sk->sk_mark;
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	fl.fl_ip_dport = inet_rsk(req)->rmt_port;
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	fl.fl_ip_sport = inet_rsk(req)->loc_port;
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	security_req_classify_flow(req, &fl);
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	opt = np->opt;
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	final_p = fl6_update_dst(&fl, opt, &final);
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	err = ip6_dst_lookup(sk, &dst, &fl);
	if (err)
		goto done;
	if (final_p)
		ipv6_addr_copy(&fl.fl6_dst, final_p);
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	if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
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		goto done;

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	skb = tcp_make_synack(sk, dst, req, rvp);
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	if (skb) {
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		__tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr);
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		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
507
		err = ip6_xmit(sk, skb, &fl, opt);
508
		err = net_xmit_eval(err);
L
Linus Torvalds 已提交
509 510 511
	}

done:
512
	if (opt && opt != np->opt)
L
Linus Torvalds 已提交
513
		sock_kfree_s(sk, opt, opt->tot_len);
514
	dst_release(dst);
L
Linus Torvalds 已提交
515 516 517
	return err;
}

518 519 520 521 522 523 524
static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req,
			     struct request_values *rvp)
{
	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
	return tcp_v6_send_synack(sk, req, rvp);
}

525 526 527 528 529 530 531 532 533 534 535 536 537 538
static inline void syn_flood_warning(struct sk_buff *skb)
{
#ifdef CONFIG_SYN_COOKIES
	if (sysctl_tcp_syncookies)
		printk(KERN_INFO
		       "TCPv6: Possible SYN flooding on port %d. "
		       "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
	else
#endif
		printk(KERN_INFO
		       "TCPv6: Possible SYN flooding on port %d. "
		       "Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
}

539
static void tcp_v6_reqsk_destructor(struct request_sock *req)
L
Linus Torvalds 已提交
540
{
541
	kfree_skb(inet6_rsk(req)->pktopts);
L
Linus Torvalds 已提交
542 543
}

544 545 546 547 548 549 550 551 552 553 554 555 556
#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++) {
557
		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
558
			return &tp->md5sig_info->keys6[i].base;
559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
	}
	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 */
579
	struct tcp_md5sig_key *key;
580 581 582
	struct tcp_sock *tp = tcp_sk(sk);
	struct tcp6_md5sig_key *keys;

583
	key = tcp_v6_md5_do_lookup(sk, peer);
584 585
	if (key) {
		/* modify existing entry - just update that one */
586 587 588
		kfree(key->key);
		key->key = newkey;
		key->keylen = newkeylen;
589 590 591 592 593 594 595 596
	} 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;
			}
E
Eric Dumazet 已提交
597
			sk_nocaps_add(sk, NETIF_F_GSO_MASK);
598
		}
599
		if (tcp_alloc_md5sig_pool(sk) == NULL) {
600 601 602
			kfree(newkey);
			return -ENOMEM;
		}
603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624
		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);
625 626
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645

		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++) {
646
		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
647
			/* Free the key */
648
			kfree(tp->md5sig_info->keys6[i].base.key);
649 650 651 652 653
			tp->md5sig_info->entries6--;

			if (tp->md5sig_info->entries6 == 0) {
				kfree(tp->md5sig_info->keys6);
				tp->md5sig_info->keys6 = NULL;
654
				tp->md5sig_info->alloced6 = 0;
655 656 657 658 659 660 661 662
			} 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]));
			}
663 664
			tcp_free_md5sig_pool();
			return 0;
665 666 667 668 669 670 671 672 673 674 675 676
		}
	}
	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++)
677
			kfree(tp->md5sig_info->keys6[i].base.key);
678 679 680 681 682 683 684 685 686 687
		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++)
688
			kfree(tp->md5sig_info->keys4[i].base.key);
689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
		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
717
		if (ipv6_addr_v4mapped(&sin6->sin6_addr))
718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
			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;
E
Eric Dumazet 已提交
734
		sk_nocaps_add(sk, NETIF_F_GSO_MASK);
735 736
	}

A
Arnaldo Carvalho de Melo 已提交
737
	newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
738 739
	if (!newkey)
		return -ENOMEM;
B
Brian Haley 已提交
740
	if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
741 742 743 744 745 746
		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);
}

747 748 749
static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
					struct in6_addr *daddr,
					struct in6_addr *saddr, int nbytes)
750 751
{
	struct tcp6_pseudohdr *bp;
752
	struct scatterlist sg;
753

754 755 756 757
	bp = &hp->md5_blk.ip6;
	/* 1. TCP pseudo-header (RFC2460) */
	ipv6_addr_copy(&bp->saddr, saddr);
	ipv6_addr_copy(&bp->daddr, daddr);
758
	bp->protocol = cpu_to_be32(IPPROTO_TCP);
A
Adam Langley 已提交
759
	bp->len = cpu_to_be32(nbytes);
760

761 762 763
	sg_init_one(&sg, bp, sizeof(*bp));
	return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
}
764

765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785
static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
			       struct in6_addr *daddr, struct in6_addr *saddr,
			       struct tcphdr *th)
{
	struct tcp_md5sig_pool *hp;
	struct hash_desc *desc;

	hp = tcp_get_md5sig_pool();
	if (!hp)
		goto clear_hash_noput;
	desc = &hp->md5_desc;

	if (crypto_hash_init(desc))
		goto clear_hash;
	if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
		goto clear_hash;
	if (tcp_md5_hash_header(hp, th))
		goto clear_hash;
	if (tcp_md5_hash_key(hp, key))
		goto clear_hash;
	if (crypto_hash_final(desc, md5_hash))
786 787 788 789
		goto clear_hash;

	tcp_put_md5sig_pool();
	return 0;
790

791 792 793 794
clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
795
	return 1;
796 797
}

798 799 800
static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
			       struct sock *sk, struct request_sock *req,
			       struct sk_buff *skb)
801 802
{
	struct in6_addr *saddr, *daddr;
803 804 805
	struct tcp_md5sig_pool *hp;
	struct hash_desc *desc;
	struct tcphdr *th = tcp_hdr(skb);
806 807 808 809

	if (sk) {
		saddr = &inet6_sk(sk)->saddr;
		daddr = &inet6_sk(sk)->daddr;
810
	} else if (req) {
811 812
		saddr = &inet6_rsk(req)->loc_addr;
		daddr = &inet6_rsk(req)->rmt_addr;
813 814 815 816
	} else {
		struct ipv6hdr *ip6h = ipv6_hdr(skb);
		saddr = &ip6h->saddr;
		daddr = &ip6h->daddr;
817
	}
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845

	hp = tcp_get_md5sig_pool();
	if (!hp)
		goto clear_hash_noput;
	desc = &hp->md5_desc;

	if (crypto_hash_init(desc))
		goto clear_hash;

	if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
		goto clear_hash;
	if (tcp_md5_hash_header(hp, th))
		goto clear_hash;
	if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
		goto clear_hash;
	if (tcp_md5_hash_key(hp, key))
		goto clear_hash;
	if (crypto_hash_final(desc, md5_hash))
		goto clear_hash;

	tcp_put_md5sig_pool();
	return 0;

clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
	return 1;
846 847 848 849 850 851
}

static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
{
	__u8 *hash_location = NULL;
	struct tcp_md5sig_key *hash_expected;
852
	struct ipv6hdr *ip6h = ipv6_hdr(skb);
853
	struct tcphdr *th = tcp_hdr(skb);
854 855 856 857
	int genhash;
	u8 newhash[16];

	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
858
	hash_location = tcp_parse_md5sig_option(th);
859

860 861 862 863 864 865
	/* We've parsed the options - do we have a hash? */
	if (!hash_expected && !hash_location)
		return 0;

	if (hash_expected && !hash_location) {
		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
866 867 868
		return 1;
	}

869 870
	if (!hash_expected && hash_location) {
		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
871 872 873 874
		return 1;
	}

	/* check the signature */
875 876 877 878
	genhash = tcp_v6_md5_hash_skb(newhash,
				      hash_expected,
				      NULL, NULL, skb);

879 880
	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
		if (net_ratelimit()) {
881
			printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
882
			       genhash ? "failed" : "mismatch",
883 884
			       &ip6h->saddr, ntohs(th->source),
			       &ip6h->daddr, ntohs(th->dest));
885 886 887 888 889 890 891
		}
		return 1;
	}
	return 0;
}
#endif

892
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
L
Linus Torvalds 已提交
893
	.family		=	AF_INET6,
894
	.obj_size	=	sizeof(struct tcp6_request_sock),
895
	.rtx_syn_ack	=	tcp_v6_rtx_synack,
896 897
	.send_ack	=	tcp_v6_reqsk_send_ack,
	.destructor	=	tcp_v6_reqsk_destructor,
898 899
	.send_reset	=	tcp_v6_send_reset,
	.syn_ack_timeout = 	tcp_syn_ack_timeout,
L
Linus Torvalds 已提交
900 901
};

902
#ifdef CONFIG_TCP_MD5SIG
903
static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
904
	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
905
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
906
};
907
#endif
908

909 910 911
static struct timewait_sock_ops tcp6_timewait_sock_ops = {
	.twsk_obj_size	= sizeof(struct tcp6_timewait_sock),
	.twsk_unique	= tcp_twsk_unique,
912
	.twsk_destructor= tcp_twsk_destructor,
913 914
};

915 916
static void __tcp_v6_send_check(struct sk_buff *skb,
				struct in6_addr *saddr, struct in6_addr *daddr)
L
Linus Torvalds 已提交
917
{
918
	struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
919

920
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
921
		th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
922
		skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
923
		skb->csum_offset = offsetof(struct tcphdr, check);
L
Linus Torvalds 已提交
924
	} else {
925 926 927
		th->check = tcp_v6_check(skb->len, saddr, daddr,
					 csum_partial(th, th->doff << 2,
						      skb->csum));
L
Linus Torvalds 已提交
928 929 930
	}
}

931
static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
932 933 934 935 936 937
{
	struct ipv6_pinfo *np = inet6_sk(sk);

	__tcp_v6_send_check(skb, &np->saddr, &np->daddr);
}

938 939 940 941 942 943 944 945
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;

946
	ipv6h = ipv6_hdr(skb);
947
	th = tcp_hdr(skb);
948 949

	th->check = 0;
950
	skb->ip_summed = CHECKSUM_PARTIAL;
951
	__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
952 953
	return 0;
}
L
Linus Torvalds 已提交
954

H
Herbert Xu 已提交
955 956
static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
					 struct sk_buff *skb)
H
Herbert Xu 已提交
957
{
H
Herbert Xu 已提交
958
	struct ipv6hdr *iph = skb_gro_network_header(skb);
H
Herbert Xu 已提交
959 960 961

	switch (skb->ip_summed) {
	case CHECKSUM_COMPLETE:
962
		if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
H
Herbert Xu 已提交
963 964 965 966 967 968 969 970 971 972 973 974 975 976
				  skb->csum)) {
			skb->ip_summed = CHECKSUM_UNNECESSARY;
			break;
		}

		/* fall through */
	case CHECKSUM_NONE:
		NAPI_GRO_CB(skb)->flush = 1;
		return NULL;
	}

	return tcp_gro_receive(head, skb);
}

H
Herbert Xu 已提交
977
static int tcp6_gro_complete(struct sk_buff *skb)
H
Herbert Xu 已提交
978 979 980 981 982 983 984 985 986 987 988
{
	struct ipv6hdr *iph = ipv6_hdr(skb);
	struct tcphdr *th = tcp_hdr(skb);

	th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
				  &iph->saddr, &iph->daddr, 0);
	skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;

	return tcp_gro_complete(skb);
}

989 990
static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
				 u32 ts, struct tcp_md5sig_key *key, int rst)
L
Linus Torvalds 已提交
991
{
992
	struct tcphdr *th = tcp_hdr(skb), *t1;
L
Linus Torvalds 已提交
993 994
	struct sk_buff *buff;
	struct flowi fl;
E
Eric Dumazet 已提交
995
	struct net *net = dev_net(skb_dst(skb)->dev);
996
	struct sock *ctl_sk = net->ipv6.tcp_sk;
997
	unsigned int tot_len = sizeof(struct tcphdr);
E
Eric Dumazet 已提交
998
	struct dst_entry *dst;
999
	__be32 *topt;
L
Linus Torvalds 已提交
1000

1001 1002
	if (ts)
		tot_len += TCPOLEN_TSTAMP_ALIGNED;
1003 1004 1005 1006 1007 1008
#ifdef CONFIG_TCP_MD5SIG
	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif

	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
L
Linus Torvalds 已提交
1009
			 GFP_ATOMIC);
1010 1011
	if (buff == NULL)
		return;
L
Linus Torvalds 已提交
1012

1013
	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
L
Linus Torvalds 已提交
1014

1015
	t1 = (struct tcphdr *) skb_push(buff, tot_len);
1016
	skb_reset_transport_header(buff);
L
Linus Torvalds 已提交
1017 1018 1019 1020 1021

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
1022
	t1->doff = tot_len / 4;
1023 1024 1025 1026 1027
	t1->seq = htonl(seq);
	t1->ack_seq = htonl(ack);
	t1->ack = !rst || !th->ack;
	t1->rst = rst;
	t1->window = htons(win);
L
Linus Torvalds 已提交
1028

1029 1030
	topt = (__be32 *)(t1 + 1);

1031 1032 1033 1034 1035 1036 1037
	if (ts) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
		*topt++ = htonl(tcp_time_stamp);
		*topt++ = htonl(ts);
	}

1038 1039
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
1040 1041 1042
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
		tcp_v6_md5_hash_hdr((__u8 *)topt, key,
1043 1044
				    &ipv6_hdr(skb)->saddr,
				    &ipv6_hdr(skb)->daddr, t1);
1045 1046 1047
	}
#endif

L
Linus Torvalds 已提交
1048
	memset(&fl, 0, sizeof(fl));
1049 1050
	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
1051

1052 1053 1054
	buff->ip_summed = CHECKSUM_PARTIAL;
	buff->csum = 0;

1055
	__tcp_v6_send_check(buff, &fl.fl6_src, &fl.fl6_dst);
L
Linus Torvalds 已提交
1056 1057

	fl.proto = IPPROTO_TCP;
1058
	fl.oif = inet6_iif(skb);
L
Linus Torvalds 已提交
1059 1060
	fl.fl_ip_dport = t1->dest;
	fl.fl_ip_sport = t1->source;
V
Venkat Yekkirala 已提交
1061
	security_skb_classify_flow(skb, &fl);
L
Linus Torvalds 已提交
1062

1063 1064 1065 1066
	/* Pass a socket to ip6_dst_lookup either it is for RST
	 * Underlying function will use this to retrieve the network
	 * namespace
	 */
E
Eric Dumazet 已提交
1067 1068 1069
	if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
		if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
			skb_dst_set(buff, dst);
1070
			ip6_xmit(ctl_sk, buff, &fl, NULL);
1071
			TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1072 1073
			if (rst)
				TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
L
Linus Torvalds 已提交
1074
			return;
A
Arnaldo Carvalho de Melo 已提交
1075
		}
L
Linus Torvalds 已提交
1076 1077 1078 1079 1080
	}

	kfree_skb(buff);
}

1081
static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
L
Linus Torvalds 已提交
1082
{
1083 1084
	struct tcphdr *th = tcp_hdr(skb);
	u32 seq = 0, ack_seq = 0;
1085
	struct tcp_md5sig_key *key = NULL;
L
Linus Torvalds 已提交
1086

1087
	if (th->rst)
L
Linus Torvalds 已提交
1088 1089
		return;

1090 1091
	if (!ipv6_unicast_destination(skb))
		return;
L
Linus Torvalds 已提交
1092

1093
#ifdef CONFIG_TCP_MD5SIG
1094 1095
	if (sk)
		key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
1096 1097
#endif

1098 1099 1100 1101 1102
	if (th->ack)
		seq = ntohl(th->ack_seq);
	else
		ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
			  (th->doff << 2);
L
Linus Torvalds 已提交
1103

1104 1105
	tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1);
}
L
Linus Torvalds 已提交
1106

1107 1108 1109 1110
static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
			    struct tcp_md5sig_key *key)
{
	tcp_v6_send_response(skb, seq, ack, win, ts, key, 0);
L
Linus Torvalds 已提交
1111 1112 1113 1114
}

static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
1115
	struct inet_timewait_sock *tw = inet_twsk(sk);
1116
	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
L
Linus Torvalds 已提交
1117

1118
	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1119
			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1120
			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
L
Linus Torvalds 已提交
1121

1122
	inet_twsk_put(tw);
L
Linus Torvalds 已提交
1123 1124
}

1125 1126
static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
				  struct request_sock *req)
L
Linus Torvalds 已提交
1127
{
1128
	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1129
			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr));
L
Linus Torvalds 已提交
1130 1131 1132 1133 1134
}


static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
1135
	struct request_sock *req, **prev;
1136
	const struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1137 1138 1139
	struct sock *nsk;

	/* Find possible connection requests. */
1140
	req = inet6_csk_search_req(sk, &prev, th->source,
1141 1142
				   &ipv6_hdr(skb)->saddr,
				   &ipv6_hdr(skb)->daddr, inet6_iif(skb));
L
Linus Torvalds 已提交
1143 1144 1145
	if (req)
		return tcp_check_req(sk, skb, req, prev);

1146
	nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1147 1148
			&ipv6_hdr(skb)->saddr, th->source,
			&ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1149 1150 1151 1152 1153 1154

	if (nsk) {
		if (nsk->sk_state != TCP_TIME_WAIT) {
			bh_lock_sock(nsk);
			return nsk;
		}
1155
		inet_twsk_put(inet_twsk(nsk));
L
Linus Torvalds 已提交
1156 1157 1158
		return NULL;
	}

1159
#ifdef CONFIG_SYN_COOKIES
1160
	if (!th->syn)
1161
		sk = cookie_v6_check(sk, skb);
L
Linus Torvalds 已提交
1162 1163 1164 1165 1166 1167 1168 1169 1170
#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)
{
1171
	struct tcp_extend_values tmp_ext;
1172
	struct tcp_options_received tmp_opt;
1173
	u8 *hash_location;
1174
	struct request_sock *req;
1175
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1176 1177
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
1178
	__u32 isn = TCP_SKB_CB(skb)->when;
1179 1180 1181 1182 1183
#ifdef CONFIG_SYN_COOKIES
	int want_cookie = 0;
#else
#define want_cookie 0
#endif
L
Linus Torvalds 已提交
1184 1185 1186 1187 1188

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

	if (!ipv6_unicast_destination(skb))
1189
		goto drop;
L
Linus Torvalds 已提交
1190

1191
	if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
L
Linus Torvalds 已提交
1192
		if (net_ratelimit())
1193 1194 1195 1196 1197 1198
			syn_flood_warning(skb);
#ifdef CONFIG_SYN_COOKIES
		if (sysctl_tcp_syncookies)
			want_cookie = 1;
		else
#endif
1199
		goto drop;
L
Linus Torvalds 已提交
1200 1201
	}

1202
	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
L
Linus Torvalds 已提交
1203 1204
		goto drop;

1205
	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
L
Linus Torvalds 已提交
1206 1207 1208
	if (req == NULL)
		goto drop;

1209 1210 1211 1212
#ifdef CONFIG_TCP_MD5SIG
	tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
#endif

L
Linus Torvalds 已提交
1213 1214 1215
	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;
1216
	tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232

	if (tmp_opt.cookie_plus > 0 &&
	    tmp_opt.saw_tstamp &&
	    !tp->rx_opt.cookie_out_never &&
	    (sysctl_tcp_cookie_size > 0 ||
	     (tp->cookie_values != NULL &&
	      tp->cookie_values->cookie_desired > 0))) {
		u8 *c;
		u32 *d;
		u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS];
		int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE;

		if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0)
			goto drop_and_free;

		/* Secret recipe starts with IP addresses */
1233
		d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0];
1234 1235 1236 1237
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
1238
		d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0];
1239 1240 1241 1242 1243 1244 1245 1246 1247
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;

		/* plus variable length Initiator Cookie */
		c = (u8 *)mess;
		while (l-- > 0)
			*c++ ^= *hash_location++;
L
Linus Torvalds 已提交
1248

1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
#ifdef CONFIG_SYN_COOKIES
		want_cookie = 0;	/* not our kind of cookie */
#endif
		tmp_ext.cookie_out_never = 0; /* false */
		tmp_ext.cookie_plus = tmp_opt.cookie_plus;
	} else if (!tp->rx_opt.cookie_in_always) {
		/* redundant indications, but ensure initialization. */
		tmp_ext.cookie_out_never = 1; /* true */
		tmp_ext.cookie_plus = 0;
	} else {
		goto drop_and_free;
	}
	tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always;
L
Linus Torvalds 已提交
1262

1263
	if (want_cookie && !tmp_opt.saw_tstamp)
1264 1265
		tcp_clear_options(&tmp_opt);

L
Linus Torvalds 已提交
1266 1267 1268
	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
	tcp_openreq_init(req, &tmp_opt, skb);

1269
	treq = inet6_rsk(req);
1270 1271
	ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1272
	if (!want_cookie || tmp_opt.tstamp_ok)
1273 1274
		TCP_ECN_create_request(req, tcp_hdr(skb));

1275
	if (!isn) {
1276 1277 1278 1279 1280 1281 1282
		if (ipv6_opt_accepted(sk, skb) ||
		    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
		    np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
			atomic_inc(&skb->users);
			treq->pktopts = skb;
		}
		treq->iif = sk->sk_bound_dev_if;
L
Linus Torvalds 已提交
1283

1284 1285 1286 1287
		/* So that link locals have meaning */
		if (!sk->sk_bound_dev_if &&
		    ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
			treq->iif = inet6_iif(skb);
1288 1289 1290 1291 1292 1293
		if (!want_cookie) {
			isn = tcp_v6_init_sequence(skb);
		} else {
			isn = cookie_v6_init_sequence(sk, skb, &req->mss);
			req->cookie_ts = tmp_opt.tstamp_ok;
		}
1294
	}
1295
	tcp_rsk(req)->snt_isn = isn;
L
Linus Torvalds 已提交
1296

1297 1298
	security_inet_conn_request(sk, skb, req);

1299 1300 1301
	if (tcp_v6_send_synack(sk, req,
			       (struct request_values *)&tmp_ext) ||
	    want_cookie)
1302
		goto drop_and_free;
L
Linus Torvalds 已提交
1303

1304 1305
	inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
	return 0;
L
Linus Torvalds 已提交
1306

1307 1308
drop_and_free:
	reqsk_free(req);
L
Linus Torvalds 已提交
1309 1310 1311 1312 1313
drop:
	return 0; /* don't send reset */
}

static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1314
					  struct request_sock *req,
L
Linus Torvalds 已提交
1315 1316
					  struct dst_entry *dst)
{
1317
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1318 1319 1320 1321 1322 1323
	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;
1324 1325 1326
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
L
Linus Torvalds 已提交
1327 1328 1329 1330 1331 1332 1333 1334

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

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

1335
		if (newsk == NULL)
L
Linus Torvalds 已提交
1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
			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));

E
Eric Dumazet 已提交
1347
		ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
L
Linus Torvalds 已提交
1348

E
Eric Dumazet 已提交
1349
		ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
L
Linus Torvalds 已提交
1350 1351 1352

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

1353
		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
1354
		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1355 1356 1357 1358
#ifdef CONFIG_TCP_MD5SIG
		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

L
Linus Torvalds 已提交
1359 1360
		newnp->pktoptions  = NULL;
		newnp->opt	   = NULL;
1361
		newnp->mcast_oif   = inet6_iif(skb);
1362
		newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1363

1364 1365 1366 1367
		/*
		 * 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
1368 1369 1370
		 */

		/* It is tricky place. Until this moment IPv4 tcp
1371
		   worked with IPv6 icsk.icsk_af_ops.
L
Linus Torvalds 已提交
1372 1373
		   Sync it now.
		 */
1374
		tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
L
Linus Torvalds 已提交
1375 1376 1377 1378

		return newsk;
	}

1379
	treq = inet6_rsk(req);
L
Linus Torvalds 已提交
1380 1381 1382 1383 1384 1385
	opt = np->opt;

	if (sk_acceptq_is_full(sk))
		goto out_overflow;

	if (dst == NULL) {
1386
		struct in6_addr *final_p, final;
L
Linus Torvalds 已提交
1387 1388 1389 1390
		struct flowi fl;

		memset(&fl, 0, sizeof(fl));
		fl.proto = IPPROTO_TCP;
1391
		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1392
		final_p = fl6_update_dst(&fl, opt, &final);
1393
		ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
L
Linus Torvalds 已提交
1394
		fl.oif = sk->sk_bound_dev_if;
B
Brian Haley 已提交
1395
		fl.mark = sk->sk_mark;
1396
		fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1397
		fl.fl_ip_sport = inet_rsk(req)->loc_port;
1398
		security_req_classify_flow(req, &fl);
L
Linus Torvalds 已提交
1399 1400 1401 1402 1403 1404 1405

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

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

A
Alexey Dobriyan 已提交
1406
		if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
L
Linus Torvalds 已提交
1407
			goto out;
1408
	}
L
Linus Torvalds 已提交
1409 1410 1411

	newsk = tcp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
1412
		goto out_nonewsk;
L
Linus Torvalds 已提交
1413

1414 1415 1416 1417 1418
	/*
	 * 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
1419

1420
	newsk->sk_gso_type = SKB_GSO_TCPV6;
1421
	__ip6_dst_store(newsk, dst, NULL, NULL);
L
Linus Torvalds 已提交
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431

	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));

1432 1433 1434 1435
	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
1436

1437
	/* Now IPv6 options...
L
Linus Torvalds 已提交
1438 1439 1440 1441

	   First: no IPv4 options.
	 */
	newinet->opt = NULL;
1442
	newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1443 1444 1445 1446 1447 1448

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

	/* Clone pktoptions received with SYN */
	newnp->pktoptions = NULL;
1449 1450 1451 1452
	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
1453 1454 1455 1456
		if (newnp->pktoptions)
			skb_set_owner_r(newnp->pktoptions, newsk);
	}
	newnp->opt	  = NULL;
1457
	newnp->mcast_oif  = inet6_iif(skb);
1458
	newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471

	/* 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);
	}

1472
	inet_csk(newsk)->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
1473
	if (newnp->opt)
1474 1475
		inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
						     newnp->opt->opt_flen);
L
Linus Torvalds 已提交
1476

J
John Heffner 已提交
1477
	tcp_mtup_init(newsk);
L
Linus Torvalds 已提交
1478 1479 1480 1481
	tcp_sync_mss(newsk, dst_mtu(dst));
	newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
	tcp_initialize_rcv_mss(newsk);

E
Eric Dumazet 已提交
1482 1483
	newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
	newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
L
Linus Torvalds 已提交
1484

1485 1486 1487 1488 1489 1490 1491 1492
#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
1493 1494
		char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
		if (newkey != NULL)
1495
			tcp_v6_md5_do_add(newsk, &newnp->daddr,
1496 1497 1498 1499
					  newkey, key->keylen);
	}
#endif

1500 1501 1502 1503
	if (__inet_inherit_port(sk, newsk) < 0) {
		sock_put(newsk);
		goto out;
	}
1504
	__inet6_hash(newsk, NULL);
L
Linus Torvalds 已提交
1505 1506 1507 1508

	return newsk;

out_overflow:
1509
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1510
out_nonewsk:
L
Linus Torvalds 已提交
1511 1512 1513
	if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
1514 1515
out:
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
L
Linus Torvalds 已提交
1516 1517 1518
	return NULL;
}

1519
static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
L
Linus Torvalds 已提交
1520
{
1521
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
H
Herbert Xu 已提交
1522
		if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1523
				  &ipv6_hdr(skb)->daddr, skb->csum)) {
1524
			skb->ip_summed = CHECKSUM_UNNECESSARY;
L
Linus Torvalds 已提交
1525
			return 0;
1526
		}
L
Linus Torvalds 已提交
1527
	}
1528

H
Herbert Xu 已提交
1529
	skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1530 1531
					      &ipv6_hdr(skb)->saddr,
					      &ipv6_hdr(skb)->daddr, 0));
1532

L
Linus Torvalds 已提交
1533
	if (skb->len <= 76) {
1534
		return __skb_checksum_complete(skb);
L
Linus Torvalds 已提交
1535 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
	}
	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);

1564 1565 1566 1567 1568
#ifdef CONFIG_TCP_MD5SIG
	if (tcp_v6_inbound_md5_hash (sk, skb))
		goto discard;
#endif

1569
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
		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.
1588
					       --ANK (980728)
L
Linus Torvalds 已提交
1589 1590 1591 1592 1593 1594
	 */
	if (np->rxopt.all)
		opt_skb = skb_clone(skb, GFP_ATOMIC);

	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
		TCP_CHECK_TIMER(sk);
1595
		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1596 1597 1598 1599 1600 1601 1602
			goto reset;
		TCP_CHECK_TIMER(sk);
		if (opt_skb)
			goto ipv6_pktoptions;
		return 0;
	}

1603
	if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
L
Linus Torvalds 已提交
1604 1605
		goto csum_err;

1606
	if (sk->sk_state == TCP_LISTEN) {
L
Linus Torvalds 已提交
1607 1608 1609 1610 1611 1612 1613 1614 1615
		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..
		 */
1616
		if(nsk != sk) {
L
Linus Torvalds 已提交
1617 1618 1619 1620 1621 1622 1623 1624 1625
			if (tcp_child_process(sk, nsk, skb))
				goto reset;
			if (opt_skb)
				__kfree_skb(opt_skb);
			return 0;
		}
	}

	TCP_CHECK_TIMER(sk);
1626
	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1627 1628 1629 1630 1631 1632 1633
		goto reset;
	TCP_CHECK_TIMER(sk);
	if (opt_skb)
		goto ipv6_pktoptions;
	return 0;

reset:
1634
	tcp_v6_send_reset(sk, skb);
L
Linus Torvalds 已提交
1635 1636 1637 1638 1639 1640
discard:
	if (opt_skb)
		__kfree_skb(opt_skb);
	kfree_skb(skb);
	return 0;
csum_err:
1641
	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655
	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))) {
1656
		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1657
			np->mcast_oif = inet6_iif(opt_skb);
1658
		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1659
			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
L
Linus Torvalds 已提交
1660 1661 1662 1663 1664 1665 1666 1667 1668
		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);
		}
	}

1669
	kfree_skb(opt_skb);
L
Linus Torvalds 已提交
1670 1671 1672
	return 0;
}

1673
static int tcp_v6_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1674
{
1675
	struct tcphdr *th;
1676
	struct ipv6hdr *hdr;
L
Linus Torvalds 已提交
1677 1678
	struct sock *sk;
	int ret;
1679
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
1680 1681 1682 1683 1684 1685 1686

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

	/*
	 *	Count it even if it's bad.
	 */
1687
	TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
L
Linus Torvalds 已提交
1688 1689 1690 1691

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

1692
	th = tcp_hdr(skb);
L
Linus Torvalds 已提交
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);
1703
	hdr = ipv6_hdr(skb);
L
Linus Torvalds 已提交
1704 1705 1706 1707 1708
	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;
1709
	TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(hdr);
L
Linus Torvalds 已提交
1710 1711
	TCP_SKB_CB(skb)->sacked = 0;

1712
	sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
L
Linus Torvalds 已提交
1713 1714 1715 1716 1717 1718 1719
	if (!sk)
		goto no_tcp_socket;

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

1720 1721 1722 1723 1724
	if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
		goto discard_and_relse;
	}

L
Linus Torvalds 已提交
1725 1726 1727
	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto discard_and_relse;

1728
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1729 1730 1731 1732
		goto discard_and_relse;

	skb->dev = NULL;

1733
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1734 1735
	ret = 0;
	if (!sock_owned_by_user(sk)) {
C
Chris Leech 已提交
1736
#ifdef CONFIG_NET_DMA
1737
		struct tcp_sock *tp = tcp_sk(sk);
1738
		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1739
			tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
1740 1741 1742
		if (tp->ucopy.dma_chan)
			ret = tcp_v6_do_rcv(sk, skb);
		else
C
Chris Leech 已提交
1743 1744 1745 1746 1747
#endif
		{
			if (!tcp_prequeue(sk, skb))
				ret = tcp_v6_do_rcv(sk, skb);
		}
1748
	} else if (unlikely(sk_add_backlog(sk, skb))) {
Z
Zhu Yi 已提交
1749
		bh_unlock_sock(sk);
1750
		NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
Z
Zhu Yi 已提交
1751 1752
		goto discard_and_relse;
	}
L
Linus Torvalds 已提交
1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763
	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:
1764
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1765
	} else {
1766
		tcp_v6_send_reset(NULL, skb);
L
Linus Torvalds 已提交
1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783
	}

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)) {
1784
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1785 1786 1787 1788
		goto discard_it;
	}

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1789
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1790
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1791 1792 1793
		goto discard_it;
	}

1794
	switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
L
Linus Torvalds 已提交
1795 1796 1797 1798
	case TCP_TW_SYN:
	{
		struct sock *sk2;

1799
		sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1800
					    &ipv6_hdr(skb)->daddr,
1801
					    ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1802
		if (sk2 != NULL) {
1803 1804 1805
			struct inet_timewait_sock *tw = inet_twsk(sk);
			inet_twsk_deschedule(tw, &tcp_death_row);
			inet_twsk_put(tw);
L
Linus Torvalds 已提交
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;
}

1821
struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
L
Linus Torvalds 已提交
1822 1823
{
	/* Alas, not yet... */
1824
	return NULL;
L
Linus Torvalds 已提交
1825 1826
}

1827
static const struct inet_connection_sock_af_ops ipv6_specific = {
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,
1833
	.get_peer	   = tcp_v6_get_peer,
1834 1835 1836 1837 1838
	.net_header_len	   = sizeof(struct ipv6hdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1839
	.bind_conflict	   = inet6_csk_bind_conflict,
1840
#ifdef CONFIG_COMPAT
1841 1842
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1843
#endif
L
Linus Torvalds 已提交
1844 1845
};

1846
#ifdef CONFIG_TCP_MD5SIG
1847
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1848
	.md5_lookup	=	tcp_v6_md5_lookup,
1849
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
1850 1851 1852
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1853
#endif
1854

L
Linus Torvalds 已提交
1855 1856 1857 1858
/*
 *	TCP over IPv4 via INET6 API
 */

1859
static const struct inet_connection_sock_af_ops ipv6_mapped = {
1860 1861 1862 1863 1864
	.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,
1865
	.get_peer	   = tcp_v4_get_peer,
1866 1867 1868 1869 1870
	.net_header_len	   = sizeof(struct iphdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1871
	.bind_conflict	   = inet6_csk_bind_conflict,
1872
#ifdef CONFIG_COMPAT
1873 1874
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1875
#endif
L
Linus Torvalds 已提交
1876 1877
};

1878
#ifdef CONFIG_TCP_MD5SIG
1879
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1880
	.md5_lookup	=	tcp_v4_md5_lookup,
1881
	.calc_md5_hash	=	tcp_v4_md5_hash_skb,
1882 1883 1884
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1885
#endif
1886

L
Linus Torvalds 已提交
1887 1888 1889 1890 1891
/* 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)
{
1892
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
1893 1894 1895 1896 1897 1898
	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);

1899
	icsk->icsk_rto = TCP_TIMEOUT_INIT;
L
Linus Torvalds 已提交
1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
	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.
	 */
I
Ilpo Järvinen 已提交
1912
	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
L
Linus Torvalds 已提交
1913
	tp->snd_cwnd_clamp = ~0;
1914
	tp->mss_cache = TCP_MSS_DEFAULT;
L
Linus Torvalds 已提交
1915 1916 1917 1918 1919

	tp->reordering = sysctl_tcp_reordering;

	sk->sk_state = TCP_CLOSE;

1920
	icsk->icsk_af_ops = &ipv6_specific;
1921
	icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1922
	icsk->icsk_sync_mss = tcp_sync_mss;
L
Linus Torvalds 已提交
1923 1924 1925
	sk->sk_write_space = sk_stream_write_space;
	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);

1926 1927 1928 1929
#ifdef CONFIG_TCP_MD5SIG
	tp->af_specific = &tcp_sock_ipv6_specific;
#endif

1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
	/* TCP Cookie Transactions */
	if (sysctl_tcp_cookie_size > 0) {
		/* Default, cookies without s_data_payload. */
		tp->cookie_values =
			kzalloc(sizeof(*tp->cookie_values),
				sk->sk_allocation);
		if (tp->cookie_values != NULL)
			kref_init(&tp->cookie_values->kref);
	}
	/* Presumed zeroed, in order of appearance:
	 *	cookie_in_always, cookie_out_never,
	 *	s_data_constant, s_data_in, s_data_out
	 */
L
Linus Torvalds 已提交
1943 1944 1945
	sk->sk_sndbuf = sysctl_tcp_wmem[1];
	sk->sk_rcvbuf = sysctl_tcp_rmem[1];

H
Herbert Xu 已提交
1946
	local_bh_disable();
1947
	percpu_counter_inc(&tcp_sockets_allocated);
H
Herbert Xu 已提交
1948
	local_bh_enable();
L
Linus Torvalds 已提交
1949 1950 1951 1952

	return 0;
}

1953
static void tcp_v6_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
1954
{
1955 1956 1957 1958 1959
#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
1960
	tcp_v4_destroy_sock(sk);
1961
	inet6_destroy_sock(sk);
L
Linus Torvalds 已提交
1962 1963
}

1964
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
1965
/* Proc filesystem TCPv6 sock list dumping. */
1966
static void get_openreq6(struct seq_file *seq,
1967
			 struct sock *sk, struct request_sock *req, int i, int uid)
L
Linus Torvalds 已提交
1968 1969
{
	int ttd = req->expires - jiffies;
1970 1971
	struct in6_addr *src = &inet6_rsk(req)->loc_addr;
	struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
L
Linus Torvalds 已提交
1972 1973 1974 1975 1976 1977 1978 1979 1980 1981

	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],
1982
		   ntohs(inet_rsk(req)->loc_port),
L
Linus Torvalds 已提交
1983 1984
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3],
1985
		   ntohs(inet_rsk(req)->rmt_port),
L
Linus Torvalds 已提交
1986 1987
		   TCP_SYN_RECV,
		   0,0, /* could print option size, but that is af dependent. */
1988 1989
		   1,   /* timers active (only the expire timer) */
		   jiffies_to_clock_t(ttd),
L
Linus Torvalds 已提交
1990 1991
		   req->retrans,
		   uid,
1992
		   0,  /* non standard timer */
L
Linus Torvalds 已提交
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
		   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);
2005
	const struct inet_connection_sock *icsk = inet_csk(sp);
L
Linus Torvalds 已提交
2006 2007 2008 2009
	struct ipv6_pinfo *np = inet6_sk(sp);

	dest  = &np->daddr;
	src   = &np->rcv_saddr;
E
Eric Dumazet 已提交
2010 2011
	destp = ntohs(inet->inet_dport);
	srcp  = ntohs(inet->inet_sport);
2012 2013

	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
L
Linus Torvalds 已提交
2014
		timer_active	= 1;
2015 2016
		timer_expires	= icsk->icsk_timeout;
	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
L
Linus Torvalds 已提交
2017
		timer_active	= 4;
2018
		timer_expires	= icsk->icsk_timeout;
L
Linus Torvalds 已提交
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028
	} 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 "
2029
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n",
L
Linus Torvalds 已提交
2030 2031 2032 2033 2034
		   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,
2035
		   sp->sk_state,
2036 2037
		   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
2038 2039
		   timer_active,
		   jiffies_to_clock_t(timer_expires - jiffies),
2040
		   icsk->icsk_retransmits,
L
Linus Torvalds 已提交
2041
		   sock_i_uid(sp),
2042
		   icsk->icsk_probes_out,
L
Linus Torvalds 已提交
2043 2044
		   sock_i_ino(sp),
		   atomic_read(&sp->sk_refcnt), sp,
2045 2046
		   jiffies_to_clock_t(icsk->icsk_rto),
		   jiffies_to_clock_t(icsk->icsk_ack.ato),
2047
		   (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
I
Ilpo Järvinen 已提交
2048 2049
		   tp->snd_cwnd,
		   tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
L
Linus Torvalds 已提交
2050 2051 2052
		   );
}

2053
static void get_timewait6_sock(struct seq_file *seq,
2054
			       struct inet_timewait_sock *tw, int i)
L
Linus Torvalds 已提交
2055 2056 2057
{
	struct in6_addr *dest, *src;
	__u16 destp, srcp;
2058
	struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
L
Linus Torvalds 已提交
2059 2060 2061 2062 2063
	int ttd = tw->tw_ttd - jiffies;

	if (ttd < 0)
		ttd = 0;

2064 2065
	dest = &tw6->tw_v6_daddr;
	src  = &tw6->tw_v6_rcv_saddr;
L
Linus Torvalds 已提交
2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115
	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 tcp_seq_afinfo tcp6_seq_afinfo = {
	.name		= "tcp6",
	.family		= AF_INET6,
2116 2117 2118
	.seq_fops	= {
		.owner		= THIS_MODULE,
	},
2119 2120 2121
	.seq_ops	= {
		.show		= tcp6_seq_show,
	},
L
Linus Torvalds 已提交
2122 2123
};

2124
int __net_init tcp6_proc_init(struct net *net)
L
Linus Torvalds 已提交
2125
{
2126
	return tcp_proc_register(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2127 2128
}

2129
void tcp6_proc_exit(struct net *net)
L
Linus Torvalds 已提交
2130
{
2131
	tcp_proc_unregister(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2132 2133 2134 2135 2136 2137 2138 2139 2140
}
#endif

struct proto tcpv6_prot = {
	.name			= "TCPv6",
	.owner			= THIS_MODULE,
	.close			= tcp_close,
	.connect		= tcp_v6_connect,
	.disconnect		= tcp_disconnect,
2141
	.accept			= inet_csk_accept,
L
Linus Torvalds 已提交
2142 2143 2144 2145 2146 2147 2148
	.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,
2149 2150
	.sendmsg		= tcp_sendmsg,
	.sendpage		= tcp_sendpage,
L
Linus Torvalds 已提交
2151 2152
	.backlog_rcv		= tcp_v6_do_rcv,
	.hash			= tcp_v6_hash,
2153 2154
	.unhash			= inet_unhash,
	.get_port		= inet_csk_get_port,
L
Linus Torvalds 已提交
2155 2156 2157 2158
	.enter_memory_pressure	= tcp_enter_memory_pressure,
	.sockets_allocated	= &tcp_sockets_allocated,
	.memory_allocated	= &tcp_memory_allocated,
	.memory_pressure	= &tcp_memory_pressure,
2159
	.orphan_count		= &tcp_orphan_count,
L
Linus Torvalds 已提交
2160 2161 2162 2163 2164
	.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),
2165
	.slab_flags		= SLAB_DESTROY_BY_RCU,
2166
	.twsk_prot		= &tcp6_timewait_sock_ops,
2167
	.rsk_prot		= &tcp6_request_sock_ops,
2168
	.h.hashinfo		= &tcp_hashinfo,
2169
	.no_autobind		= true,
2170 2171 2172 2173
#ifdef CONFIG_COMPAT
	.compat_setsockopt	= compat_tcp_setsockopt,
	.compat_getsockopt	= compat_tcp_getsockopt,
#endif
L
Linus Torvalds 已提交
2174 2175
};

2176
static const struct inet6_protocol tcpv6_protocol = {
L
Linus Torvalds 已提交
2177 2178
	.handler	=	tcp_v6_rcv,
	.err_handler	=	tcp_v6_err,
2179
	.gso_send_check	=	tcp_v6_gso_send_check,
H
Herbert Xu 已提交
2180
	.gso_segment	=	tcp_tso_segment,
H
Herbert Xu 已提交
2181 2182
	.gro_receive	=	tcp6_gro_receive,
	.gro_complete	=	tcp6_gro_complete,
L
Linus Torvalds 已提交
2183 2184 2185 2186 2187 2188 2189 2190 2191
	.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,
	.no_check	=	0,
2192 2193
	.flags		=	INET_PROTOSW_PERMANENT |
				INET_PROTOSW_ICSK,
L
Linus Torvalds 已提交
2194 2195
};

2196
static int __net_init tcpv6_net_init(struct net *net)
2197
{
2198 2199
	return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
				    SOCK_RAW, IPPROTO_TCP, net);
2200 2201
}

2202
static void __net_exit tcpv6_net_exit(struct net *net)
2203
{
2204
	inet_ctl_sock_destroy(net->ipv6.tcp_sk);
E
Eric W. Biederman 已提交
2205 2206
}

2207
static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
E
Eric W. Biederman 已提交
2208 2209
{
	inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
2210 2211 2212
}

static struct pernet_operations tcpv6_net_ops = {
E
Eric W. Biederman 已提交
2213 2214 2215
	.init	    = tcpv6_net_init,
	.exit	    = tcpv6_net_exit,
	.exit_batch = tcpv6_net_exit_batch,
2216 2217
};

2218
int __init tcpv6_init(void)
L
Linus Torvalds 已提交
2219
{
2220 2221 2222 2223 2224 2225
	int ret;

	ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
	if (ret)
		goto out;

L
Linus Torvalds 已提交
2226
	/* register inet6 protocol */
2227 2228 2229 2230
	ret = inet6_register_protosw(&tcpv6_protosw);
	if (ret)
		goto out_tcpv6_protocol;

2231
	ret = register_pernet_subsys(&tcpv6_net_ops);
2232 2233 2234 2235
	if (ret)
		goto out_tcpv6_protosw;
out:
	return ret;
2236

2237 2238 2239 2240 2241 2242 2243
out_tcpv6_protocol:
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
out_tcpv6_protosw:
	inet6_unregister_protosw(&tcpv6_protosw);
	goto out;
}

2244
void tcpv6_exit(void)
2245
{
2246
	unregister_pernet_subsys(&tcpv6_net_ops);
2247 2248
	inet6_unregister_protosw(&tcpv6_protosw);
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
L
Linus Torvalds 已提交
2249
}