tcp_ipv6.c 58.0 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 <net/secure_seq.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,
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				    const struct in6_addr *saddr,
				    const 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,
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						   const struct in6_addr *addr)
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{
	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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				   const struct in6_addr *saddr,
				   const 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 rt6_info *rt;
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	struct flowi6 fl6;
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	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(&fl6, 0, sizeof(fl6));
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	if (np->sndflow) {
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		fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
		IP6_ECN_flow_init(fl6.flowlabel);
		if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
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			struct ip6_flowlabel *flowlabel;
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			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
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			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);
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	np->flow_label = fl6.flowlabel;
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	/*
	 *	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;

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	fl6.flowi6_proto = IPPROTO_TCP;
	ipv6_addr_copy(&fl6.daddr, &np->daddr);
	ipv6_addr_copy(&fl6.saddr,
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		       (saddr ? saddr : &np->saddr));
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	fl6.flowi6_oif = sk->sk_bound_dev_if;
	fl6.flowi6_mark = sk->sk_mark;
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	fl6.fl6_dport = usin->sin6_port;
	fl6.fl6_sport = inet->inet_sport;
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	final_p = fl6_update_dst(&fl6, np->opt, &final);
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	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
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	dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
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	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
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		goto failure;
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	}
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	if (saddr == NULL) {
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		saddr = &fl6.saddr;
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		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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	rt = (struct rt6_info *) dst;
	if (tcp_death_row.sysctl_tw_recycle &&
	    !tp->rx_opt.ts_recent_stamp &&
	    ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) {
		struct inet_peer *peer = rt6_get_peer(rt);
		/*
		 * VJ's idea. We save last timestamp seen from
		 * the destination in peer table, when entering state
		 * TIME-WAIT * and initialize rx_opt.ts_recent from it,
		 * when trying new connection.
		 */
		if (peer) {
			inet_peer_refcheck(peer);
			if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) {
				tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
				tp->rx_opt.ts_recent = peer->tcp_ts;
			}
		}
	}

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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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{
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	const struct ipv6hdr *hdr = (const 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) {
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		struct dst_entry *dst;
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		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);
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			struct flowi6 fl6;
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			/* BUGGG_FUTURE: Again, it is not clear how
			   to handle rthdr case. Ignore this complexity
			   for now.
			 */
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			memset(&fl6, 0, sizeof(fl6));
			fl6.flowi6_proto = IPPROTO_TCP;
			ipv6_addr_copy(&fl6.daddr, &np->daddr);
			ipv6_addr_copy(&fl6.saddr, &np->saddr);
			fl6.flowi6_oif = sk->sk_bound_dev_if;
			fl6.flowi6_mark = sk->sk_mark;
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			fl6.fl6_dport = inet->inet_dport;
			fl6.fl6_sport = inet->inet_sport;
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			security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));

			dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
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			if (IS_ERR(dst)) {
				sk->sk_err_soft = -PTR_ERR(dst);
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				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 flowi6 fl6;
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	struct dst_entry *dst;
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	int err;
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	memset(&fl6, 0, sizeof(fl6));
	fl6.flowi6_proto = IPPROTO_TCP;
	ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr);
	ipv6_addr_copy(&fl6.saddr, &treq->loc_addr);
	fl6.flowlabel = 0;
	fl6.flowi6_oif = treq->iif;
	fl6.flowi6_mark = sk->sk_mark;
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	fl6.fl6_dport = inet_rsk(req)->rmt_port;
	fl6.fl6_sport = inet_rsk(req)->loc_port;
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	security_req_classify_flow(req, flowi6_to_flowi(&fl6));
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	opt = np->opt;
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	final_p = fl6_update_dst(&fl6, opt, &final);
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	dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
505 506
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
507
		dst = NULL;
508
		goto done;
509
	}
510
	skb = tcp_make_synack(sk, dst, req, rvp);
511
	err = -ENOMEM;
L
Linus Torvalds 已提交
512
	if (skb) {
513
		__tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr);
L
Linus Torvalds 已提交
514

515 516
		ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr);
		err = ip6_xmit(sk, skb, &fl6, opt);
517
		err = net_xmit_eval(err);
L
Linus Torvalds 已提交
518 519 520
	}

done:
521
	if (opt && opt != np->opt)
L
Linus Torvalds 已提交
522
		sock_kfree_s(sk, opt, opt->tot_len);
523
	dst_release(dst);
L
Linus Torvalds 已提交
524 525 526
	return err;
}

527 528 529 530 531 532 533
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);
}

534
static void tcp_v6_reqsk_destructor(struct request_sock *req)
L
Linus Torvalds 已提交
535
{
536
	kfree_skb(inet6_rsk(req)->pktopts);
L
Linus Torvalds 已提交
537 538
}

539 540
#ifdef CONFIG_TCP_MD5SIG
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
541
						   const struct in6_addr *addr)
542 543 544 545 546 547 548 549 550 551
{
	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++) {
552
		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
553
			return &tp->md5sig_info->keys6[i].base;
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569
	}
	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);
}

570
static int tcp_v6_md5_do_add(struct sock *sk, const struct in6_addr *peer,
571 572 573
			     char *newkey, u8 newkeylen)
{
	/* Add key to the list */
574
	struct tcp_md5sig_key *key;
575 576 577
	struct tcp_sock *tp = tcp_sk(sk);
	struct tcp6_md5sig_key *keys;

578
	key = tcp_v6_md5_do_lookup(sk, peer);
579 580
	if (key) {
		/* modify existing entry - just update that one */
581 582 583
		kfree(key->key);
		key->key = newkey;
		key->keylen = newkeylen;
584 585 586 587 588 589 590 591
	} 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
592
			sk_nocaps_add(sk, NETIF_F_GSO_MASK);
593
		}
594
		if (tcp_alloc_md5sig_pool(sk) == NULL) {
595 596 597
			kfree(newkey);
			return -ENOMEM;
		}
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
		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);
620 621
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
622 623 624 625 626 627 628 629 630 631 632 633 634

		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);
}

635
static int tcp_v6_md5_do_del(struct sock *sk, const struct in6_addr *peer)
636 637 638 639 640
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	for (i = 0; i < tp->md5sig_info->entries6; i++) {
641
		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
642
			/* Free the key */
643
			kfree(tp->md5sig_info->keys6[i].base.key);
644 645 646 647 648
			tp->md5sig_info->entries6--;

			if (tp->md5sig_info->entries6 == 0) {
				kfree(tp->md5sig_info->keys6);
				tp->md5sig_info->keys6 = NULL;
649
				tp->md5sig_info->alloced6 = 0;
650 651 652 653 654 655 656 657
			} 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]));
			}
658 659
			tcp_free_md5sig_pool();
			return 0;
660 661 662 663 664 665 666 667 668 669 670 671
		}
	}
	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++)
672
			kfree(tp->md5sig_info->keys6[i].base.key);
673 674 675 676 677 678 679 680 681 682
		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++)
683
			kfree(tp->md5sig_info->keys4[i].base.key);
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
		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
712
		if (ipv6_addr_v4mapped(&sin6->sin6_addr))
713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
			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
729
		sk_nocaps_add(sk, NETIF_F_GSO_MASK);
730 731
	}

A
Arnaldo Carvalho de Melo 已提交
732
	newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
733 734
	if (!newkey)
		return -ENOMEM;
B
Brian Haley 已提交
735
	if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
736 737 738 739 740 741
		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);
}

742
static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
743 744
					const struct in6_addr *daddr,
					const struct in6_addr *saddr, int nbytes)
745 746
{
	struct tcp6_pseudohdr *bp;
747
	struct scatterlist sg;
748

749 750 751 752
	bp = &hp->md5_blk.ip6;
	/* 1. TCP pseudo-header (RFC2460) */
	ipv6_addr_copy(&bp->saddr, saddr);
	ipv6_addr_copy(&bp->daddr, daddr);
753
	bp->protocol = cpu_to_be32(IPPROTO_TCP);
A
Adam Langley 已提交
754
	bp->len = cpu_to_be32(nbytes);
755

756 757 758
	sg_init_one(&sg, bp, sizeof(*bp));
	return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
}
759

760
static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
761
			       const struct in6_addr *daddr, struct in6_addr *saddr,
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
			       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))
781 782 783 784
		goto clear_hash;

	tcp_put_md5sig_pool();
	return 0;
785

786 787 788 789
clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
790
	return 1;
791 792
}

793 794 795
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)
796
{
797
	const struct in6_addr *saddr, *daddr;
798 799 800
	struct tcp_md5sig_pool *hp;
	struct hash_desc *desc;
	struct tcphdr *th = tcp_hdr(skb);
801 802 803 804

	if (sk) {
		saddr = &inet6_sk(sk)->saddr;
		daddr = &inet6_sk(sk)->daddr;
805
	} else if (req) {
806 807
		saddr = &inet6_rsk(req)->loc_addr;
		daddr = &inet6_rsk(req)->rmt_addr;
808
	} else {
809
		const struct ipv6hdr *ip6h = ipv6_hdr(skb);
810 811
		saddr = &ip6h->saddr;
		daddr = &ip6h->daddr;
812
	}
813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840

	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;
841 842 843 844 845 846
}

static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
{
	__u8 *hash_location = NULL;
	struct tcp_md5sig_key *hash_expected;
847
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
848
	struct tcphdr *th = tcp_hdr(skb);
849 850 851 852
	int genhash;
	u8 newhash[16];

	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
853
	hash_location = tcp_parse_md5sig_option(th);
854

855 856 857 858 859 860
	/* 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);
861 862 863
		return 1;
	}

864 865
	if (!hash_expected && hash_location) {
		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
866 867 868 869
		return 1;
	}

	/* check the signature */
870 871 872 873
	genhash = tcp_v6_md5_hash_skb(newhash,
				      hash_expected,
				      NULL, NULL, skb);

874 875
	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
		if (net_ratelimit()) {
876
			printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
877
			       genhash ? "failed" : "mismatch",
878 879
			       &ip6h->saddr, ntohs(th->source),
			       &ip6h->daddr, ntohs(th->dest));
880 881 882 883 884 885 886
		}
		return 1;
	}
	return 0;
}
#endif

887
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
L
Linus Torvalds 已提交
888
	.family		=	AF_INET6,
889
	.obj_size	=	sizeof(struct tcp6_request_sock),
890
	.rtx_syn_ack	=	tcp_v6_rtx_synack,
891 892
	.send_ack	=	tcp_v6_reqsk_send_ack,
	.destructor	=	tcp_v6_reqsk_destructor,
893 894
	.send_reset	=	tcp_v6_send_reset,
	.syn_ack_timeout = 	tcp_syn_ack_timeout,
L
Linus Torvalds 已提交
895 896
};

897
#ifdef CONFIG_TCP_MD5SIG
898
static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
899
	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
900
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
901
};
902
#endif
903

904
static void __tcp_v6_send_check(struct sk_buff *skb,
905
				const struct in6_addr *saddr, const struct in6_addr *daddr)
L
Linus Torvalds 已提交
906
{
907
	struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
908

909
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
910
		th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
911
		skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
912
		skb->csum_offset = offsetof(struct tcphdr, check);
L
Linus Torvalds 已提交
913
	} else {
914 915 916
		th->check = tcp_v6_check(skb->len, saddr, daddr,
					 csum_partial(th, th->doff << 2,
						      skb->csum));
L
Linus Torvalds 已提交
917 918 919
	}
}

920
static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
921 922 923 924 925 926
{
	struct ipv6_pinfo *np = inet6_sk(sk);

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

927 928
static int tcp_v6_gso_send_check(struct sk_buff *skb)
{
929
	const struct ipv6hdr *ipv6h;
930 931 932 933 934
	struct tcphdr *th;

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

935
	ipv6h = ipv6_hdr(skb);
936
	th = tcp_hdr(skb);
937 938

	th->check = 0;
939
	skb->ip_summed = CHECKSUM_PARTIAL;
940
	__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
941 942
	return 0;
}
L
Linus Torvalds 已提交
943

H
Herbert Xu 已提交
944 945
static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
					 struct sk_buff *skb)
H
Herbert Xu 已提交
946
{
947
	const struct ipv6hdr *iph = skb_gro_network_header(skb);
H
Herbert Xu 已提交
948 949 950

	switch (skb->ip_summed) {
	case CHECKSUM_COMPLETE:
951
		if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
H
Herbert Xu 已提交
952 953 954 955 956 957 958 959 960 961 962 963 964 965
				  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
966
static int tcp6_gro_complete(struct sk_buff *skb)
H
Herbert Xu 已提交
967
{
968
	const struct ipv6hdr *iph = ipv6_hdr(skb);
H
Herbert Xu 已提交
969 970 971 972 973 974 975 976 977
	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);
}

978 979
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
980
{
981
	struct tcphdr *th = tcp_hdr(skb), *t1;
L
Linus Torvalds 已提交
982
	struct sk_buff *buff;
983
	struct flowi6 fl6;
E
Eric Dumazet 已提交
984
	struct net *net = dev_net(skb_dst(skb)->dev);
985
	struct sock *ctl_sk = net->ipv6.tcp_sk;
986
	unsigned int tot_len = sizeof(struct tcphdr);
E
Eric Dumazet 已提交
987
	struct dst_entry *dst;
988
	__be32 *topt;
L
Linus Torvalds 已提交
989

990 991
	if (ts)
		tot_len += TCPOLEN_TSTAMP_ALIGNED;
992 993 994 995 996 997
#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
998
			 GFP_ATOMIC);
999 1000
	if (buff == NULL)
		return;
L
Linus Torvalds 已提交
1001

1002
	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
L
Linus Torvalds 已提交
1003

1004
	t1 = (struct tcphdr *) skb_push(buff, tot_len);
1005
	skb_reset_transport_header(buff);
L
Linus Torvalds 已提交
1006 1007 1008 1009 1010

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
1011
	t1->doff = tot_len / 4;
1012 1013 1014 1015 1016
	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
1017

1018 1019
	topt = (__be32 *)(t1 + 1);

1020 1021 1022 1023 1024 1025 1026
	if (ts) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
		*topt++ = htonl(tcp_time_stamp);
		*topt++ = htonl(ts);
	}

1027 1028
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
1029 1030 1031
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
		tcp_v6_md5_hash_hdr((__u8 *)topt, key,
1032 1033
				    &ipv6_hdr(skb)->saddr,
				    &ipv6_hdr(skb)->daddr, t1);
1034 1035 1036
	}
#endif

1037 1038 1039
	memset(&fl6, 0, sizeof(fl6));
	ipv6_addr_copy(&fl6.daddr, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&fl6.saddr, &ipv6_hdr(skb)->daddr);
L
Linus Torvalds 已提交
1040

1041 1042 1043
	buff->ip_summed = CHECKSUM_PARTIAL;
	buff->csum = 0;

1044
	__tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
L
Linus Torvalds 已提交
1045

1046 1047
	fl6.flowi6_proto = IPPROTO_TCP;
	fl6.flowi6_oif = inet6_iif(skb);
1048 1049
	fl6.fl6_dport = t1->dest;
	fl6.fl6_sport = t1->source;
1050
	security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
L
Linus Torvalds 已提交
1051

1052 1053 1054 1055
	/* Pass a socket to ip6_dst_lookup either it is for RST
	 * Underlying function will use this to retrieve the network
	 * namespace
	 */
1056
	dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
1057 1058
	if (!IS_ERR(dst)) {
		skb_dst_set(buff, dst);
1059
		ip6_xmit(ctl_sk, buff, &fl6, NULL);
1060 1061 1062 1063
		TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
		if (rst)
			TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
		return;
L
Linus Torvalds 已提交
1064 1065 1066 1067 1068
	}

	kfree_skb(buff);
}

1069
static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
L
Linus Torvalds 已提交
1070
{
1071 1072
	struct tcphdr *th = tcp_hdr(skb);
	u32 seq = 0, ack_seq = 0;
1073
	struct tcp_md5sig_key *key = NULL;
L
Linus Torvalds 已提交
1074

1075
	if (th->rst)
L
Linus Torvalds 已提交
1076 1077
		return;

1078 1079
	if (!ipv6_unicast_destination(skb))
		return;
L
Linus Torvalds 已提交
1080

1081
#ifdef CONFIG_TCP_MD5SIG
1082 1083
	if (sk)
		key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
1084 1085
#endif

1086 1087 1088 1089 1090
	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
1091

1092 1093
	tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1);
}
L
Linus Torvalds 已提交
1094

1095 1096 1097 1098
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
1099 1100 1101 1102
}

static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
1103
	struct inet_timewait_sock *tw = inet_twsk(sk);
1104
	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
L
Linus Torvalds 已提交
1105

1106
	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1107
			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1108
			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
L
Linus Torvalds 已提交
1109

1110
	inet_twsk_put(tw);
L
Linus Torvalds 已提交
1111 1112
}

1113 1114
static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
				  struct request_sock *req)
L
Linus Torvalds 已提交
1115
{
1116
	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1117
			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr));
L
Linus Torvalds 已提交
1118 1119 1120 1121 1122
}


static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
1123
	struct request_sock *req, **prev;
1124
	const struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1125 1126 1127
	struct sock *nsk;

	/* Find possible connection requests. */
1128
	req = inet6_csk_search_req(sk, &prev, th->source,
1129 1130
				   &ipv6_hdr(skb)->saddr,
				   &ipv6_hdr(skb)->daddr, inet6_iif(skb));
L
Linus Torvalds 已提交
1131 1132 1133
	if (req)
		return tcp_check_req(sk, skb, req, prev);

1134
	nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1135 1136
			&ipv6_hdr(skb)->saddr, th->source,
			&ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1137 1138 1139 1140 1141 1142

	if (nsk) {
		if (nsk->sk_state != TCP_TIME_WAIT) {
			bh_lock_sock(nsk);
			return nsk;
		}
1143
		inet_twsk_put(inet_twsk(nsk));
L
Linus Torvalds 已提交
1144 1145 1146
		return NULL;
	}

1147
#ifdef CONFIG_SYN_COOKIES
1148
	if (!th->syn)
1149
		sk = cookie_v6_check(sk, skb);
L
Linus Torvalds 已提交
1150 1151 1152 1153 1154 1155 1156 1157 1158
#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)
{
1159
	struct tcp_extend_values tmp_ext;
1160
	struct tcp_options_received tmp_opt;
1161
	u8 *hash_location;
1162
	struct request_sock *req;
1163
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1164 1165
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
1166
	__u32 isn = TCP_SKB_CB(skb)->when;
1167
	struct dst_entry *dst = NULL;
1168
	int want_cookie = 0;
L
Linus Torvalds 已提交
1169 1170 1171 1172 1173

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

	if (!ipv6_unicast_destination(skb))
1174
		goto drop;
L
Linus Torvalds 已提交
1175

1176
	if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1177 1178 1179
		want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
		if (!want_cookie)
			goto drop;
L
Linus Torvalds 已提交
1180 1181
	}

1182
	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
L
Linus Torvalds 已提交
1183 1184
		goto drop;

1185
	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
L
Linus Torvalds 已提交
1186 1187 1188
	if (req == NULL)
		goto drop;

1189 1190 1191 1192
#ifdef CONFIG_TCP_MD5SIG
	tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
#endif

L
Linus Torvalds 已提交
1193 1194 1195
	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;
1196
	tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212

	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 */
1213
		d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0];
1214 1215 1216 1217
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
1218
		d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0];
1219 1220 1221 1222 1223 1224 1225 1226 1227
		*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
1228

1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
		want_cookie = 0;	/* not our kind of cookie */
		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
1240

1241
	if (want_cookie && !tmp_opt.saw_tstamp)
1242 1243
		tcp_clear_options(&tmp_opt);

L
Linus Torvalds 已提交
1244 1245 1246
	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
	tcp_openreq_init(req, &tmp_opt, skb);

1247
	treq = inet6_rsk(req);
1248 1249
	ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1250
	if (!want_cookie || tmp_opt.tstamp_ok)
1251 1252
		TCP_ECN_create_request(req, tcp_hdr(skb));

1253
	if (!isn) {
1254 1255
		struct inet_peer *peer = NULL;

1256 1257 1258 1259 1260 1261 1262
		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
1263

1264 1265 1266 1267
		/* 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);
1268 1269

		if (want_cookie) {
1270 1271
			isn = cookie_v6_init_sequence(sk, skb, &req->mss);
			req->cookie_ts = tmp_opt.tstamp_ok;
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
			goto have_isn;
		}

		/* VJ's idea. We save last timestamp seen
		 * from the destination in peer table, when entering
		 * state TIME-WAIT, and check against it before
		 * accepting new connection request.
		 *
		 * If "isn" is not zero, this request hit alive
		 * timewait bucket, so that all the necessary checks
		 * are made in the function processing timewait state.
		 */
		if (tmp_opt.saw_tstamp &&
		    tcp_death_row.sysctl_tw_recycle &&
		    (dst = inet6_csk_route_req(sk, req)) != NULL &&
		    (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL &&
1288
		    ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6,
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
				    &treq->rmt_addr)) {
			inet_peer_refcheck(peer);
			if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
			    (s32)(peer->tcp_ts - req->ts_recent) >
							TCP_PAWS_WINDOW) {
				NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
				goto drop_and_release;
			}
		}
		/* Kill the following clause, if you dislike this way. */
		else if (!sysctl_tcp_syncookies &&
			 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
			  (sysctl_max_syn_backlog >> 2)) &&
			 (!peer || !peer->tcp_ts_stamp) &&
			 (!dst || !dst_metric(dst, RTAX_RTT))) {
			/* Without syncookies last quarter of
			 * backlog is filled with destinations,
			 * proven to be alive.
			 * It means that we continue to communicate
			 * to destinations, already remembered
			 * to the moment of synflood.
			 */
			LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n",
				       &treq->rmt_addr, ntohs(tcp_hdr(skb)->source));
			goto drop_and_release;
1314
		}
1315 1316

		isn = tcp_v6_init_sequence(skb);
1317
	}
1318
have_isn:
1319
	tcp_rsk(req)->snt_isn = isn;
1320
	tcp_rsk(req)->snt_synack = tcp_time_stamp;
L
Linus Torvalds 已提交
1321

1322 1323
	security_inet_conn_request(sk, skb, req);

1324 1325 1326
	if (tcp_v6_send_synack(sk, req,
			       (struct request_values *)&tmp_ext) ||
	    want_cookie)
1327
		goto drop_and_free;
L
Linus Torvalds 已提交
1328

1329 1330
	inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
	return 0;
L
Linus Torvalds 已提交
1331

1332 1333
drop_and_release:
	dst_release(dst);
1334 1335
drop_and_free:
	reqsk_free(req);
L
Linus Torvalds 已提交
1336 1337 1338 1339 1340
drop:
	return 0; /* don't send reset */
}

static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1341
					  struct request_sock *req,
L
Linus Torvalds 已提交
1342 1343
					  struct dst_entry *dst)
{
1344
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1345 1346 1347 1348 1349 1350
	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;
1351 1352 1353
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
L
Linus Torvalds 已提交
1354 1355 1356 1357 1358 1359 1360 1361

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

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

1362
		if (newsk == NULL)
L
Linus Torvalds 已提交
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373
			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
1374
		ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
L
Linus Torvalds 已提交
1375

E
Eric Dumazet 已提交
1376
		ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
L
Linus Torvalds 已提交
1377 1378 1379

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

1380
		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
1381
		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1382 1383 1384 1385
#ifdef CONFIG_TCP_MD5SIG
		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

L
Linus Torvalds 已提交
1386 1387
		newnp->pktoptions  = NULL;
		newnp->opt	   = NULL;
1388
		newnp->mcast_oif   = inet6_iif(skb);
1389
		newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1390

1391 1392 1393 1394
		/*
		 * 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
1395 1396 1397
		 */

		/* It is tricky place. Until this moment IPv4 tcp
1398
		   worked with IPv6 icsk.icsk_af_ops.
L
Linus Torvalds 已提交
1399 1400
		   Sync it now.
		 */
1401
		tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
L
Linus Torvalds 已提交
1402 1403 1404 1405

		return newsk;
	}

1406
	treq = inet6_rsk(req);
L
Linus Torvalds 已提交
1407 1408 1409 1410 1411
	opt = np->opt;

	if (sk_acceptq_is_full(sk))
		goto out_overflow;

1412 1413 1414
	if (!dst) {
		dst = inet6_csk_route_req(sk, req);
		if (!dst)
L
Linus Torvalds 已提交
1415
			goto out;
1416
	}
L
Linus Torvalds 已提交
1417 1418 1419

	newsk = tcp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
1420
		goto out_nonewsk;
L
Linus Torvalds 已提交
1421

1422 1423 1424 1425 1426
	/*
	 * 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
1427

1428
	newsk->sk_gso_type = SKB_GSO_TCPV6;
1429
	__ip6_dst_store(newsk, dst, NULL, NULL);
L
Linus Torvalds 已提交
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439

	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));

1440 1441 1442 1443
	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
1444

1445
	/* Now IPv6 options...
L
Linus Torvalds 已提交
1446 1447 1448

	   First: no IPv4 options.
	 */
1449
	newinet->inet_opt = NULL;
1450
	newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1451 1452 1453 1454 1455 1456

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

	/* Clone pktoptions received with SYN */
	newnp->pktoptions = NULL;
1457 1458 1459 1460
	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
1461 1462 1463 1464
		if (newnp->pktoptions)
			skb_set_owner_r(newnp->pktoptions, newsk);
	}
	newnp->opt	  = NULL;
1465
	newnp->mcast_oif  = inet6_iif(skb);
1466
	newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479

	/* 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);
	}

1480
	inet_csk(newsk)->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
1481
	if (newnp->opt)
1482 1483
		inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
						     newnp->opt->opt_flen);
L
Linus Torvalds 已提交
1484

J
John Heffner 已提交
1485
	tcp_mtup_init(newsk);
L
Linus Torvalds 已提交
1486
	tcp_sync_mss(newsk, dst_mtu(dst));
1487
	newtp->advmss = dst_metric_advmss(dst);
L
Linus Torvalds 已提交
1488
	tcp_initialize_rcv_mss(newsk);
1489 1490 1491 1492
	if (tcp_rsk(req)->snt_synack)
		tcp_valid_rtt_meas(newsk,
		    tcp_time_stamp - tcp_rsk(req)->snt_synack);
	newtp->total_retrans = req->retrans;
L
Linus Torvalds 已提交
1493

E
Eric Dumazet 已提交
1494 1495
	newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
	newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
L
Linus Torvalds 已提交
1496

1497 1498 1499 1500 1501 1502 1503 1504
#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
1505 1506
		char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
		if (newkey != NULL)
1507
			tcp_v6_md5_do_add(newsk, &newnp->daddr,
1508 1509 1510 1511
					  newkey, key->keylen);
	}
#endif

1512 1513 1514 1515
	if (__inet_inherit_port(sk, newsk) < 0) {
		sock_put(newsk);
		goto out;
	}
1516
	__inet6_hash(newsk, NULL);
L
Linus Torvalds 已提交
1517 1518 1519 1520

	return newsk;

out_overflow:
1521
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1522
out_nonewsk:
L
Linus Torvalds 已提交
1523 1524 1525
	if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
1526 1527
out:
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
L
Linus Torvalds 已提交
1528 1529 1530
	return NULL;
}

1531
static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
L
Linus Torvalds 已提交
1532
{
1533
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
H
Herbert Xu 已提交
1534
		if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1535
				  &ipv6_hdr(skb)->daddr, skb->csum)) {
1536
			skb->ip_summed = CHECKSUM_UNNECESSARY;
L
Linus Torvalds 已提交
1537
			return 0;
1538
		}
L
Linus Torvalds 已提交
1539
	}
1540

H
Herbert Xu 已提交
1541
	skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1542 1543
					      &ipv6_hdr(skb)->saddr,
					      &ipv6_hdr(skb)->daddr, 0));
1544

L
Linus Torvalds 已提交
1545
	if (skb->len <= 76) {
1546
		return __skb_checksum_complete(skb);
L
Linus Torvalds 已提交
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575
	}
	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);

1576 1577 1578 1579 1580
#ifdef CONFIG_TCP_MD5SIG
	if (tcp_v6_inbound_md5_hash (sk, skb))
		goto discard;
#endif

1581
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
		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.
1600
					       --ANK (980728)
L
Linus Torvalds 已提交
1601 1602 1603 1604 1605
	 */
	if (np->rxopt.all)
		opt_skb = skb_clone(skb, GFP_ATOMIC);

	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1606
		sock_rps_save_rxhash(sk, skb->rxhash);
1607
		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1608 1609 1610 1611 1612 1613
			goto reset;
		if (opt_skb)
			goto ipv6_pktoptions;
		return 0;
	}

1614
	if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
L
Linus Torvalds 已提交
1615 1616
		goto csum_err;

1617
	if (sk->sk_state == TCP_LISTEN) {
L
Linus Torvalds 已提交
1618 1619 1620 1621 1622 1623 1624 1625 1626
		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..
		 */
1627
		if(nsk != sk) {
1628
			sock_rps_save_rxhash(nsk, skb->rxhash);
L
Linus Torvalds 已提交
1629 1630 1631 1632 1633 1634
			if (tcp_child_process(sk, nsk, skb))
				goto reset;
			if (opt_skb)
				__kfree_skb(opt_skb);
			return 0;
		}
1635 1636
	} else
		sock_rps_save_rxhash(sk, skb->rxhash);
L
Linus Torvalds 已提交
1637

1638
	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1639 1640 1641 1642 1643 1644
		goto reset;
	if (opt_skb)
		goto ipv6_pktoptions;
	return 0;

reset:
1645
	tcp_v6_send_reset(sk, skb);
L
Linus Torvalds 已提交
1646 1647 1648 1649 1650 1651
discard:
	if (opt_skb)
		__kfree_skb(opt_skb);
	kfree_skb(skb);
	return 0;
csum_err:
1652
	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666
	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))) {
1667
		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1668
			np->mcast_oif = inet6_iif(opt_skb);
1669
		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1670
			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
L
Linus Torvalds 已提交
1671 1672 1673 1674 1675 1676 1677 1678 1679
		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);
		}
	}

1680
	kfree_skb(opt_skb);
L
Linus Torvalds 已提交
1681 1682 1683
	return 0;
}

1684
static int tcp_v6_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1685
{
1686
	struct tcphdr *th;
1687
	const struct ipv6hdr *hdr;
L
Linus Torvalds 已提交
1688 1689
	struct sock *sk;
	int ret;
1690
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
1691 1692 1693 1694 1695 1696 1697

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

	/*
	 *	Count it even if it's bad.
	 */
1698
	TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
L
Linus Torvalds 已提交
1699 1700 1701 1702

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

1703
	th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1704 1705 1706 1707 1708 1709

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

1710
	if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
L
Linus Torvalds 已提交
1711 1712
		goto bad_packet;

1713
	th = tcp_hdr(skb);
1714
	hdr = ipv6_hdr(skb);
L
Linus Torvalds 已提交
1715 1716 1717 1718 1719
	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;
1720
	TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(hdr);
L
Linus Torvalds 已提交
1721 1722
	TCP_SKB_CB(skb)->sacked = 0;

1723
	sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
L
Linus Torvalds 已提交
1724 1725 1726 1727 1728 1729 1730
	if (!sk)
		goto no_tcp_socket;

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

1731 1732 1733 1734 1735
	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
1736 1737 1738
	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto discard_and_relse;

1739
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1740 1741 1742 1743
		goto discard_and_relse;

	skb->dev = NULL;

1744
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1745 1746
	ret = 0;
	if (!sock_owned_by_user(sk)) {
C
Chris Leech 已提交
1747
#ifdef CONFIG_NET_DMA
1748
		struct tcp_sock *tp = tcp_sk(sk);
1749
		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1750
			tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
1751 1752 1753
		if (tp->ucopy.dma_chan)
			ret = tcp_v6_do_rcv(sk, skb);
		else
C
Chris Leech 已提交
1754 1755 1756 1757 1758
#endif
		{
			if (!tcp_prequeue(sk, skb))
				ret = tcp_v6_do_rcv(sk, skb);
		}
1759
	} else if (unlikely(sk_add_backlog(sk, skb))) {
Z
Zhu Yi 已提交
1760
		bh_unlock_sock(sk);
1761
		NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
Z
Zhu Yi 已提交
1762 1763
		goto discard_and_relse;
	}
L
Linus Torvalds 已提交
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
	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:
1775
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1776
	} else {
1777
		tcp_v6_send_reset(NULL, skb);
L
Linus Torvalds 已提交
1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794
	}

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)) {
1795
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1796 1797 1798 1799
		goto discard_it;
	}

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1800
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1801
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1802 1803 1804
		goto discard_it;
	}

1805
	switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
L
Linus Torvalds 已提交
1806 1807 1808 1809
	case TCP_TW_SYN:
	{
		struct sock *sk2;

1810
		sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1811
					    &ipv6_hdr(skb)->daddr,
1812
					    ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1813
		if (sk2 != NULL) {
1814 1815 1816
			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
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831
			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;
}

1832 1833
static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
{
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845
	struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct inet_peer *peer;

	if (!rt ||
	    !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) {
		peer = inet_getpeer_v6(&np->daddr, 1);
		*release_it = true;
	} else {
		if (!rt->rt6i_peer)
			rt6_bind_peer(rt, 1);
		peer = rt->rt6i_peer;
1846
		*release_it = false;
1847 1848 1849
	}

	return peer;
1850 1851 1852
}

static void *tcp_v6_tw_get_peer(struct sock *sk)
L
Linus Torvalds 已提交
1853
{
1854
	struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
1855 1856 1857 1858 1859
	struct inet_timewait_sock *tw = inet_twsk(sk);

	if (tw->tw_family == AF_INET)
		return tcp_v4_tw_get_peer(sk);

1860
	return inet_getpeer_v6(&tw6->tw_v6_daddr, 1);
L
Linus Torvalds 已提交
1861 1862
}

1863 1864 1865 1866 1867 1868 1869
static struct timewait_sock_ops tcp6_timewait_sock_ops = {
	.twsk_obj_size	= sizeof(struct tcp6_timewait_sock),
	.twsk_unique	= tcp_twsk_unique,
	.twsk_destructor= tcp_twsk_destructor,
	.twsk_getpeer	= tcp_v6_tw_get_peer,
};

1870
static const struct inet_connection_sock_af_ops ipv6_specific = {
1871 1872 1873 1874 1875
	.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,
1876
	.get_peer	   = tcp_v6_get_peer,
1877 1878 1879 1880 1881
	.net_header_len	   = sizeof(struct ipv6hdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1882
	.bind_conflict	   = inet6_csk_bind_conflict,
1883
#ifdef CONFIG_COMPAT
1884 1885
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1886
#endif
L
Linus Torvalds 已提交
1887 1888
};

1889
#ifdef CONFIG_TCP_MD5SIG
1890
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1891
	.md5_lookup	=	tcp_v6_md5_lookup,
1892
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
1893 1894 1895
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1896
#endif
1897

L
Linus Torvalds 已提交
1898 1899 1900 1901
/*
 *	TCP over IPv4 via INET6 API
 */

1902
static const struct inet_connection_sock_af_ops ipv6_mapped = {
1903 1904 1905 1906 1907
	.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,
1908
	.get_peer	   = tcp_v4_get_peer,
1909 1910 1911 1912 1913
	.net_header_len	   = sizeof(struct iphdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1914
	.bind_conflict	   = inet6_csk_bind_conflict,
1915
#ifdef CONFIG_COMPAT
1916 1917
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1918
#endif
L
Linus Torvalds 已提交
1919 1920
};

1921
#ifdef CONFIG_TCP_MD5SIG
1922
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1923
	.md5_lookup	=	tcp_v4_md5_lookup,
1924
	.calc_md5_hash	=	tcp_v4_md5_hash_skb,
1925 1926 1927
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1928
#endif
1929

L
Linus Torvalds 已提交
1930 1931 1932 1933 1934
/* 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)
{
1935
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
1936 1937 1938 1939 1940 1941
	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);

1942
	icsk->icsk_rto = TCP_TIMEOUT_INIT;
L
Linus Torvalds 已提交
1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954
	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
1955
	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
L
Linus Torvalds 已提交
1956
	tp->snd_cwnd_clamp = ~0;
1957
	tp->mss_cache = TCP_MSS_DEFAULT;
L
Linus Torvalds 已提交
1958 1959 1960 1961 1962

	tp->reordering = sysctl_tcp_reordering;

	sk->sk_state = TCP_CLOSE;

1963
	icsk->icsk_af_ops = &ipv6_specific;
1964
	icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1965
	icsk->icsk_sync_mss = tcp_sync_mss;
L
Linus Torvalds 已提交
1966 1967 1968
	sk->sk_write_space = sk_stream_write_space;
	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);

1969 1970 1971 1972
#ifdef CONFIG_TCP_MD5SIG
	tp->af_specific = &tcp_sock_ipv6_specific;
#endif

1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985
	/* 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
1986 1987 1988
	sk->sk_sndbuf = sysctl_tcp_wmem[1];
	sk->sk_rcvbuf = sysctl_tcp_rmem[1];

H
Herbert Xu 已提交
1989
	local_bh_disable();
1990
	percpu_counter_inc(&tcp_sockets_allocated);
H
Herbert Xu 已提交
1991
	local_bh_enable();
L
Linus Torvalds 已提交
1992 1993 1994 1995

	return 0;
}

1996
static void tcp_v6_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
1997
{
1998 1999 2000 2001 2002
#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
2003
	tcp_v4_destroy_sock(sk);
2004
	inet6_destroy_sock(sk);
L
Linus Torvalds 已提交
2005 2006
}

2007
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
2008
/* Proc filesystem TCPv6 sock list dumping. */
2009
static void get_openreq6(struct seq_file *seq,
2010
			 struct sock *sk, struct request_sock *req, int i, int uid)
L
Linus Torvalds 已提交
2011 2012
{
	int ttd = req->expires - jiffies;
2013 2014
	const struct in6_addr *src = &inet6_rsk(req)->loc_addr;
	const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
L
Linus Torvalds 已提交
2015 2016 2017 2018 2019 2020

	if (ttd < 0)
		ttd = 0;

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
D
Dan Rosenberg 已提交
2021
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
L
Linus Torvalds 已提交
2022 2023 2024
		   i,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3],
2025
		   ntohs(inet_rsk(req)->loc_port),
L
Linus Torvalds 已提交
2026 2027
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3],
2028
		   ntohs(inet_rsk(req)->rmt_port),
L
Linus Torvalds 已提交
2029 2030
		   TCP_SYN_RECV,
		   0,0, /* could print option size, but that is af dependent. */
2031 2032
		   1,   /* timers active (only the expire timer) */
		   jiffies_to_clock_t(ttd),
L
Linus Torvalds 已提交
2033 2034
		   req->retrans,
		   uid,
2035
		   0,  /* non standard timer */
L
Linus Torvalds 已提交
2036 2037 2038 2039 2040 2041
		   0, /* open_requests have no inode */
		   0, req);
}

static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
{
2042
	const struct in6_addr *dest, *src;
L
Linus Torvalds 已提交
2043 2044 2045 2046 2047
	__u16 destp, srcp;
	int timer_active;
	unsigned long timer_expires;
	struct inet_sock *inet = inet_sk(sp);
	struct tcp_sock *tp = tcp_sk(sp);
2048
	const struct inet_connection_sock *icsk = inet_csk(sp);
L
Linus Torvalds 已提交
2049 2050 2051 2052
	struct ipv6_pinfo *np = inet6_sk(sp);

	dest  = &np->daddr;
	src   = &np->rcv_saddr;
E
Eric Dumazet 已提交
2053 2054
	destp = ntohs(inet->inet_dport);
	srcp  = ntohs(inet->inet_sport);
2055 2056

	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
L
Linus Torvalds 已提交
2057
		timer_active	= 1;
2058 2059
		timer_expires	= icsk->icsk_timeout;
	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
L
Linus Torvalds 已提交
2060
		timer_active	= 4;
2061
		timer_expires	= icsk->icsk_timeout;
L
Linus Torvalds 已提交
2062 2063 2064 2065 2066 2067 2068 2069 2070 2071
	} 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 "
D
Dan Rosenberg 已提交
2072
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n",
L
Linus Torvalds 已提交
2073 2074 2075 2076 2077
		   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,
2078
		   sp->sk_state,
2079 2080
		   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
2081 2082
		   timer_active,
		   jiffies_to_clock_t(timer_expires - jiffies),
2083
		   icsk->icsk_retransmits,
L
Linus Torvalds 已提交
2084
		   sock_i_uid(sp),
2085
		   icsk->icsk_probes_out,
L
Linus Torvalds 已提交
2086 2087
		   sock_i_ino(sp),
		   atomic_read(&sp->sk_refcnt), sp,
2088 2089
		   jiffies_to_clock_t(icsk->icsk_rto),
		   jiffies_to_clock_t(icsk->icsk_ack.ato),
2090
		   (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
I
Ilpo Järvinen 已提交
2091 2092
		   tp->snd_cwnd,
		   tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
L
Linus Torvalds 已提交
2093 2094 2095
		   );
}

2096
static void get_timewait6_sock(struct seq_file *seq,
2097
			       struct inet_timewait_sock *tw, int i)
L
Linus Torvalds 已提交
2098
{
2099
	const struct in6_addr *dest, *src;
L
Linus Torvalds 已提交
2100
	__u16 destp, srcp;
2101
	struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
L
Linus Torvalds 已提交
2102 2103 2104 2105 2106
	int ttd = tw->tw_ttd - jiffies;

	if (ttd < 0)
		ttd = 0;

2107 2108
	dest = &tw6->tw_v6_daddr;
	src  = &tw6->tw_v6_rcv_saddr;
L
Linus Torvalds 已提交
2109 2110 2111 2112 2113
	destp = ntohs(tw->tw_dport);
	srcp  = ntohs(tw->tw_sport);

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
D
Dan Rosenberg 已提交
2114
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
L
Linus Torvalds 已提交
2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158
		   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,
2159 2160 2161
	.seq_fops	= {
		.owner		= THIS_MODULE,
	},
2162 2163 2164
	.seq_ops	= {
		.show		= tcp6_seq_show,
	},
L
Linus Torvalds 已提交
2165 2166
};

2167
int __net_init tcp6_proc_init(struct net *net)
L
Linus Torvalds 已提交
2168
{
2169
	return tcp_proc_register(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2170 2171
}

2172
void tcp6_proc_exit(struct net *net)
L
Linus Torvalds 已提交
2173
{
2174
	tcp_proc_unregister(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2175 2176 2177 2178 2179 2180 2181 2182 2183
}
#endif

struct proto tcpv6_prot = {
	.name			= "TCPv6",
	.owner			= THIS_MODULE,
	.close			= tcp_close,
	.connect		= tcp_v6_connect,
	.disconnect		= tcp_disconnect,
2184
	.accept			= inet_csk_accept,
L
Linus Torvalds 已提交
2185 2186 2187 2188 2189 2190 2191
	.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,
2192 2193
	.sendmsg		= tcp_sendmsg,
	.sendpage		= tcp_sendpage,
L
Linus Torvalds 已提交
2194 2195
	.backlog_rcv		= tcp_v6_do_rcv,
	.hash			= tcp_v6_hash,
2196 2197
	.unhash			= inet_unhash,
	.get_port		= inet_csk_get_port,
L
Linus Torvalds 已提交
2198 2199 2200 2201
	.enter_memory_pressure	= tcp_enter_memory_pressure,
	.sockets_allocated	= &tcp_sockets_allocated,
	.memory_allocated	= &tcp_memory_allocated,
	.memory_pressure	= &tcp_memory_pressure,
2202
	.orphan_count		= &tcp_orphan_count,
L
Linus Torvalds 已提交
2203 2204 2205 2206 2207
	.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),
2208
	.slab_flags		= SLAB_DESTROY_BY_RCU,
2209
	.twsk_prot		= &tcp6_timewait_sock_ops,
2210
	.rsk_prot		= &tcp6_request_sock_ops,
2211
	.h.hashinfo		= &tcp_hashinfo,
2212
	.no_autobind		= true,
2213 2214 2215 2216
#ifdef CONFIG_COMPAT
	.compat_setsockopt	= compat_tcp_setsockopt,
	.compat_getsockopt	= compat_tcp_getsockopt,
#endif
L
Linus Torvalds 已提交
2217 2218
};

2219
static const struct inet6_protocol tcpv6_protocol = {
L
Linus Torvalds 已提交
2220 2221
	.handler	=	tcp_v6_rcv,
	.err_handler	=	tcp_v6_err,
2222
	.gso_send_check	=	tcp_v6_gso_send_check,
H
Herbert Xu 已提交
2223
	.gso_segment	=	tcp_tso_segment,
H
Herbert Xu 已提交
2224 2225
	.gro_receive	=	tcp6_gro_receive,
	.gro_complete	=	tcp6_gro_complete,
L
Linus Torvalds 已提交
2226 2227 2228 2229 2230 2231 2232 2233 2234
	.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,
2235 2236
	.flags		=	INET_PROTOSW_PERMANENT |
				INET_PROTOSW_ICSK,
L
Linus Torvalds 已提交
2237 2238
};

2239
static int __net_init tcpv6_net_init(struct net *net)
2240
{
2241 2242
	return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
				    SOCK_RAW, IPPROTO_TCP, net);
2243 2244
}

2245
static void __net_exit tcpv6_net_exit(struct net *net)
2246
{
2247
	inet_ctl_sock_destroy(net->ipv6.tcp_sk);
E
Eric W. Biederman 已提交
2248 2249
}

2250
static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
E
Eric W. Biederman 已提交
2251 2252
{
	inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
2253 2254 2255
}

static struct pernet_operations tcpv6_net_ops = {
E
Eric W. Biederman 已提交
2256 2257 2258
	.init	    = tcpv6_net_init,
	.exit	    = tcpv6_net_exit,
	.exit_batch = tcpv6_net_exit_batch,
2259 2260
};

2261
int __init tcpv6_init(void)
L
Linus Torvalds 已提交
2262
{
2263 2264 2265 2266 2267 2268
	int ret;

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

L
Linus Torvalds 已提交
2269
	/* register inet6 protocol */
2270 2271 2272 2273
	ret = inet6_register_protosw(&tcpv6_protosw);
	if (ret)
		goto out_tcpv6_protocol;

2274
	ret = register_pernet_subsys(&tcpv6_net_ops);
2275 2276 2277 2278
	if (ret)
		goto out_tcpv6_protosw;
out:
	return ret;
2279

2280 2281 2282 2283 2284 2285 2286
out_tcpv6_protocol:
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
out_tcpv6_protosw:
	inet6_unregister_protosw(&tcpv6_protosw);
	goto out;
}

2287
void tcpv6_exit(void)
2288
{
2289
	unregister_pernet_subsys(&tcpv6_net_ops);
2290 2291
	inet6_unregister_protosw(&tcpv6_protosw);
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
L
Linus Torvalds 已提交
2292
}