tcp_ipv6.c 58.5 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(const 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
		ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr);
516
		err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
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
		}
594 595
		if (tp->md5sig_info->entries6 == 0 &&
			tcp_alloc_md5sig_pool(sk) == NULL) {
596 597 598
			kfree(newkey);
			return -ENOMEM;
		}
599 600 601 602 603 604
		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) {
				kfree(newkey);
605 606
				if (tp->md5sig_info->entries6 == 0)
					tcp_free_md5sig_pool();
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
				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);
622 623
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
624 625 626 627 628 629 630 631 632 633 634 635 636

		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);
}

637
static int tcp_v6_md5_do_del(struct sock *sk, const struct in6_addr *peer)
638 639 640 641 642
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	for (i = 0; i < tp->md5sig_info->entries6; i++) {
643
		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
644
			/* Free the key */
645
			kfree(tp->md5sig_info->keys6[i].base.key);
646 647 648 649 650
			tp->md5sig_info->entries6--;

			if (tp->md5sig_info->entries6 == 0) {
				kfree(tp->md5sig_info->keys6);
				tp->md5sig_info->keys6 = NULL;
651
				tp->md5sig_info->alloced6 = 0;
652
				tcp_free_md5sig_pool();
653 654 655 656 657 658 659 660
			} 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]));
			}
661
			return 0;
662 663 664 665 666 667 668 669 670 671 672 673
		}
	}
	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++)
674
			kfree(tp->md5sig_info->keys6[i].base.key);
675 676 677 678 679 680 681 682 683 684
		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++)
685
			kfree(tp->md5sig_info->keys4[i].base.key);
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
		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
714
		if (ipv6_addr_v4mapped(&sin6->sin6_addr))
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730
			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
731
		sk_nocaps_add(sk, NETIF_F_GSO_MASK);
732 733
	}

A
Arnaldo Carvalho de Melo 已提交
734
	newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
735 736
	if (!newkey)
		return -ENOMEM;
B
Brian Haley 已提交
737
	if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
738 739 740 741 742 743
		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);
}

744
static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
745 746
					const struct in6_addr *daddr,
					const struct in6_addr *saddr, int nbytes)
747 748
{
	struct tcp6_pseudohdr *bp;
749
	struct scatterlist sg;
750

751 752 753 754
	bp = &hp->md5_blk.ip6;
	/* 1. TCP pseudo-header (RFC2460) */
	ipv6_addr_copy(&bp->saddr, saddr);
	ipv6_addr_copy(&bp->daddr, daddr);
755
	bp->protocol = cpu_to_be32(IPPROTO_TCP);
A
Adam Langley 已提交
756
	bp->len = cpu_to_be32(nbytes);
757

758 759 760
	sg_init_one(&sg, bp, sizeof(*bp));
	return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
}
761

762
static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
763
			       const struct in6_addr *daddr, struct in6_addr *saddr,
E
Eric Dumazet 已提交
764
			       const struct tcphdr *th)
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
{
	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))
783 784 785 786
		goto clear_hash;

	tcp_put_md5sig_pool();
	return 0;
787

788 789 790 791
clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
792
	return 1;
793 794
}

795
static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
E
Eric Dumazet 已提交
796 797 798
			       const struct sock *sk,
			       const struct request_sock *req,
			       const struct sk_buff *skb)
799
{
800
	const struct in6_addr *saddr, *daddr;
801 802
	struct tcp_md5sig_pool *hp;
	struct hash_desc *desc;
E
Eric Dumazet 已提交
803
	const struct tcphdr *th = tcp_hdr(skb);
804 805 806 807

	if (sk) {
		saddr = &inet6_sk(sk)->saddr;
		daddr = &inet6_sk(sk)->daddr;
808
	} else if (req) {
809 810
		saddr = &inet6_rsk(req)->loc_addr;
		daddr = &inet6_rsk(req)->rmt_addr;
811
	} else {
812
		const struct ipv6hdr *ip6h = ipv6_hdr(skb);
813 814
		saddr = &ip6h->saddr;
		daddr = &ip6h->daddr;
815
	}
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843

	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;
844 845
}

E
Eric Dumazet 已提交
846
static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
847
{
848
	const __u8 *hash_location = NULL;
849
	struct tcp_md5sig_key *hash_expected;
850
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
E
Eric Dumazet 已提交
851
	const struct tcphdr *th = tcp_hdr(skb);
852 853 854 855
	int genhash;
	u8 newhash[16];

	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
856
	hash_location = tcp_parse_md5sig_option(th);
857

858 859 860 861 862 863
	/* 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);
864 865 866
		return 1;
	}

867 868
	if (!hash_expected && hash_location) {
		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
869 870 871 872
		return 1;
	}

	/* check the signature */
873 874 875 876
	genhash = tcp_v6_md5_hash_skb(newhash,
				      hash_expected,
				      NULL, NULL, skb);

877 878
	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
		if (net_ratelimit()) {
879
			printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
880
			       genhash ? "failed" : "mismatch",
881 882
			       &ip6h->saddr, ntohs(th->source),
			       &ip6h->daddr, ntohs(th->dest));
883 884 885 886 887 888 889
		}
		return 1;
	}
	return 0;
}
#endif

890
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
L
Linus Torvalds 已提交
891
	.family		=	AF_INET6,
892
	.obj_size	=	sizeof(struct tcp6_request_sock),
893
	.rtx_syn_ack	=	tcp_v6_rtx_synack,
894 895
	.send_ack	=	tcp_v6_reqsk_send_ack,
	.destructor	=	tcp_v6_reqsk_destructor,
896 897
	.send_reset	=	tcp_v6_send_reset,
	.syn_ack_timeout = 	tcp_syn_ack_timeout,
L
Linus Torvalds 已提交
898 899
};

900
#ifdef CONFIG_TCP_MD5SIG
901
static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
902
	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
903
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
904
};
905
#endif
906

907
static void __tcp_v6_send_check(struct sk_buff *skb,
908
				const struct in6_addr *saddr, const struct in6_addr *daddr)
L
Linus Torvalds 已提交
909
{
910
	struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
911

912
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
913
		th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
914
		skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
915
		skb->csum_offset = offsetof(struct tcphdr, check);
L
Linus Torvalds 已提交
916
	} else {
917 918 919
		th->check = tcp_v6_check(skb->len, saddr, daddr,
					 csum_partial(th, th->doff << 2,
						      skb->csum));
L
Linus Torvalds 已提交
920 921 922
	}
}

923
static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
924 925 926 927 928 929
{
	struct ipv6_pinfo *np = inet6_sk(sk);

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

930 931
static int tcp_v6_gso_send_check(struct sk_buff *skb)
{
932
	const struct ipv6hdr *ipv6h;
933 934 935 936 937
	struct tcphdr *th;

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

938
	ipv6h = ipv6_hdr(skb);
939
	th = tcp_hdr(skb);
940 941

	th->check = 0;
942
	skb->ip_summed = CHECKSUM_PARTIAL;
943
	__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
944 945
	return 0;
}
L
Linus Torvalds 已提交
946

H
Herbert Xu 已提交
947 948
static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
					 struct sk_buff *skb)
H
Herbert Xu 已提交
949
{
950
	const struct ipv6hdr *iph = skb_gro_network_header(skb);
H
Herbert Xu 已提交
951 952 953

	switch (skb->ip_summed) {
	case CHECKSUM_COMPLETE:
954
		if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
H
Herbert Xu 已提交
955 956 957 958 959 960 961 962 963 964 965 966 967 968
				  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
969
static int tcp6_gro_complete(struct sk_buff *skb)
H
Herbert Xu 已提交
970
{
971
	const struct ipv6hdr *iph = ipv6_hdr(skb);
H
Herbert Xu 已提交
972 973 974 975 976 977 978 979 980
	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);
}

981
static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
982
				 u32 ts, struct tcp_md5sig_key *key, int rst, u8 tclass)
L
Linus Torvalds 已提交
983
{
984 985
	const struct tcphdr *th = tcp_hdr(skb);
	struct tcphdr *t1;
L
Linus Torvalds 已提交
986
	struct sk_buff *buff;
987
	struct flowi6 fl6;
E
Eric Dumazet 已提交
988
	struct net *net = dev_net(skb_dst(skb)->dev);
989
	struct sock *ctl_sk = net->ipv6.tcp_sk;
990
	unsigned int tot_len = sizeof(struct tcphdr);
E
Eric Dumazet 已提交
991
	struct dst_entry *dst;
992
	__be32 *topt;
L
Linus Torvalds 已提交
993

994 995
	if (ts)
		tot_len += TCPOLEN_TSTAMP_ALIGNED;
996 997 998 999 1000 1001
#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
1002
			 GFP_ATOMIC);
1003 1004
	if (buff == NULL)
		return;
L
Linus Torvalds 已提交
1005

1006
	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
L
Linus Torvalds 已提交
1007

1008
	t1 = (struct tcphdr *) skb_push(buff, tot_len);
1009
	skb_reset_transport_header(buff);
L
Linus Torvalds 已提交
1010 1011 1012 1013 1014

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
1015
	t1->doff = tot_len / 4;
1016 1017 1018 1019 1020
	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
1021

1022 1023
	topt = (__be32 *)(t1 + 1);

1024 1025 1026 1027 1028 1029 1030
	if (ts) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
		*topt++ = htonl(tcp_time_stamp);
		*topt++ = htonl(ts);
	}

1031 1032
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
1033 1034 1035
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
		tcp_v6_md5_hash_hdr((__u8 *)topt, key,
1036 1037
				    &ipv6_hdr(skb)->saddr,
				    &ipv6_hdr(skb)->daddr, t1);
1038 1039 1040
	}
#endif

1041 1042 1043
	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
1044

1045 1046 1047
	buff->ip_summed = CHECKSUM_PARTIAL;
	buff->csum = 0;

1048
	__tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
L
Linus Torvalds 已提交
1049

1050 1051
	fl6.flowi6_proto = IPPROTO_TCP;
	fl6.flowi6_oif = inet6_iif(skb);
1052 1053
	fl6.fl6_dport = t1->dest;
	fl6.fl6_sport = t1->source;
1054
	security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
L
Linus Torvalds 已提交
1055

1056 1057 1058 1059
	/* Pass a socket to ip6_dst_lookup either it is for RST
	 * Underlying function will use this to retrieve the network
	 * namespace
	 */
1060
	dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
1061 1062
	if (!IS_ERR(dst)) {
		skb_dst_set(buff, dst);
1063
		ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);
1064 1065 1066 1067
		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
1068 1069 1070 1071 1072
	}

	kfree_skb(buff);
}

1073
static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
L
Linus Torvalds 已提交
1074
{
1075
	const struct tcphdr *th = tcp_hdr(skb);
1076
	u32 seq = 0, ack_seq = 0;
1077
	struct tcp_md5sig_key *key = NULL;
L
Linus Torvalds 已提交
1078

1079
	if (th->rst)
L
Linus Torvalds 已提交
1080 1081
		return;

1082 1083
	if (!ipv6_unicast_destination(skb))
		return;
L
Linus Torvalds 已提交
1084

1085
#ifdef CONFIG_TCP_MD5SIG
1086 1087
	if (sk)
		key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
1088 1089
#endif

1090 1091 1092 1093 1094
	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
1095

1096
	tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1, 0);
1097
}
L
Linus Torvalds 已提交
1098

1099
static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
1100
			    struct tcp_md5sig_key *key, u8 tclass)
1101
{
1102
	tcp_v6_send_response(skb, seq, ack, win, ts, key, 0, tclass);
L
Linus Torvalds 已提交
1103 1104 1105 1106
}

static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
1107
	struct inet_timewait_sock *tw = inet_twsk(sk);
1108
	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
L
Linus Torvalds 已提交
1109

1110
	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1111
			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1112 1113
			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw),
			tw->tw_tclass);
L
Linus Torvalds 已提交
1114

1115
	inet_twsk_put(tw);
L
Linus Torvalds 已提交
1116 1117
}

1118 1119
static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
				  struct request_sock *req)
L
Linus Torvalds 已提交
1120
{
1121
	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1122
			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0);
L
Linus Torvalds 已提交
1123 1124 1125 1126 1127
}


static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
1128
	struct request_sock *req, **prev;
1129
	const struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1130 1131 1132
	struct sock *nsk;

	/* Find possible connection requests. */
1133
	req = inet6_csk_search_req(sk, &prev, th->source,
1134 1135
				   &ipv6_hdr(skb)->saddr,
				   &ipv6_hdr(skb)->daddr, inet6_iif(skb));
L
Linus Torvalds 已提交
1136 1137 1138
	if (req)
		return tcp_check_req(sk, skb, req, prev);

1139
	nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1140 1141
			&ipv6_hdr(skb)->saddr, th->source,
			&ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1142 1143 1144 1145 1146 1147

	if (nsk) {
		if (nsk->sk_state != TCP_TIME_WAIT) {
			bh_lock_sock(nsk);
			return nsk;
		}
1148
		inet_twsk_put(inet_twsk(nsk));
L
Linus Torvalds 已提交
1149 1150 1151
		return NULL;
	}

1152
#ifdef CONFIG_SYN_COOKIES
1153
	if (!th->syn)
1154
		sk = cookie_v6_check(sk, skb);
L
Linus Torvalds 已提交
1155 1156 1157 1158 1159 1160 1161 1162 1163
#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)
{
1164
	struct tcp_extend_values tmp_ext;
1165
	struct tcp_options_received tmp_opt;
1166
	const u8 *hash_location;
1167
	struct request_sock *req;
1168
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1169 1170
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
1171
	__u32 isn = TCP_SKB_CB(skb)->when;
1172
	struct dst_entry *dst = NULL;
1173
	int want_cookie = 0;
L
Linus Torvalds 已提交
1174 1175 1176 1177 1178

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

	if (!ipv6_unicast_destination(skb))
1179
		goto drop;
L
Linus Torvalds 已提交
1180

1181
	if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1182 1183 1184
		want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
		if (!want_cookie)
			goto drop;
L
Linus Torvalds 已提交
1185 1186
	}

1187
	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
L
Linus Torvalds 已提交
1188 1189
		goto drop;

1190
	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
L
Linus Torvalds 已提交
1191 1192 1193
	if (req == NULL)
		goto drop;

1194 1195 1196 1197
#ifdef CONFIG_TCP_MD5SIG
	tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
#endif

L
Linus Torvalds 已提交
1198 1199 1200
	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;
1201
	tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217

	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 */
1218
		d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0];
1219 1220 1221 1222
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
1223
		d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0];
1224 1225 1226 1227 1228 1229 1230 1231 1232
		*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
1233

1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
		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
1245

1246
	if (want_cookie && !tmp_opt.saw_tstamp)
1247 1248
		tcp_clear_options(&tmp_opt);

L
Linus Torvalds 已提交
1249 1250 1251
	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
	tcp_openreq_init(req, &tmp_opt, skb);

1252
	treq = inet6_rsk(req);
1253 1254
	ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1255
	if (!want_cookie || tmp_opt.tstamp_ok)
1256 1257
		TCP_ECN_create_request(req, tcp_hdr(skb));

1258
	if (!isn) {
1259 1260
		struct inet_peer *peer = NULL;

1261 1262 1263 1264 1265 1266 1267
		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
1268

1269 1270 1271 1272
		/* 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);
1273 1274

		if (want_cookie) {
1275 1276
			isn = cookie_v6_init_sequence(sk, skb, &req->mss);
			req->cookie_ts = tmp_opt.tstamp_ok;
1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
			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 &&
1293
		    ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6,
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
				    &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;
1319
		}
1320 1321

		isn = tcp_v6_init_sequence(skb);
1322
	}
1323
have_isn:
1324
	tcp_rsk(req)->snt_isn = isn;
1325
	tcp_rsk(req)->snt_synack = tcp_time_stamp;
L
Linus Torvalds 已提交
1326

1327 1328
	security_inet_conn_request(sk, skb, req);

1329 1330 1331
	if (tcp_v6_send_synack(sk, req,
			       (struct request_values *)&tmp_ext) ||
	    want_cookie)
1332
		goto drop_and_free;
L
Linus Torvalds 已提交
1333

1334 1335
	inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
	return 0;
L
Linus Torvalds 已提交
1336

1337 1338
drop_and_release:
	dst_release(dst);
1339 1340
drop_and_free:
	reqsk_free(req);
L
Linus Torvalds 已提交
1341 1342 1343 1344 1345
drop:
	return 0; /* don't send reset */
}

static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1346
					  struct request_sock *req,
L
Linus Torvalds 已提交
1347 1348
					  struct dst_entry *dst)
{
1349
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1350 1351 1352 1353 1354 1355
	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;
1356 1357 1358
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
L
Linus Torvalds 已提交
1359 1360 1361 1362 1363 1364 1365 1366

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

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

1367
		if (newsk == NULL)
L
Linus Torvalds 已提交
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
			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
1379
		ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
L
Linus Torvalds 已提交
1380

E
Eric Dumazet 已提交
1381
		ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
L
Linus Torvalds 已提交
1382 1383 1384

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

1385
		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
1386
		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1387 1388 1389 1390
#ifdef CONFIG_TCP_MD5SIG
		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

1391 1392
		newnp->ipv6_ac_list = NULL;
		newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1393 1394
		newnp->pktoptions  = NULL;
		newnp->opt	   = NULL;
1395
		newnp->mcast_oif   = inet6_iif(skb);
1396
		newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1397

1398 1399 1400 1401
		/*
		 * 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
1402 1403 1404
		 */

		/* It is tricky place. Until this moment IPv4 tcp
1405
		   worked with IPv6 icsk.icsk_af_ops.
L
Linus Torvalds 已提交
1406 1407
		   Sync it now.
		 */
1408
		tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
L
Linus Torvalds 已提交
1409 1410 1411 1412

		return newsk;
	}

1413
	treq = inet6_rsk(req);
L
Linus Torvalds 已提交
1414 1415 1416 1417 1418
	opt = np->opt;

	if (sk_acceptq_is_full(sk))
		goto out_overflow;

1419 1420 1421
	if (!dst) {
		dst = inet6_csk_route_req(sk, req);
		if (!dst)
L
Linus Torvalds 已提交
1422
			goto out;
1423
	}
L
Linus Torvalds 已提交
1424 1425 1426

	newsk = tcp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
1427
		goto out_nonewsk;
L
Linus Torvalds 已提交
1428

1429 1430 1431 1432 1433
	/*
	 * 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
1434

1435
	newsk->sk_gso_type = SKB_GSO_TCPV6;
1436
	__ip6_dst_store(newsk, dst, NULL, NULL);
L
Linus Torvalds 已提交
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446

	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));

1447 1448 1449 1450
	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
1451

1452
	/* Now IPv6 options...
L
Linus Torvalds 已提交
1453 1454 1455

	   First: no IPv4 options.
	 */
1456
	newinet->inet_opt = NULL;
1457
	newnp->ipv6_ac_list = NULL;
1458
	newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1459 1460 1461 1462 1463 1464

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

	/* Clone pktoptions received with SYN */
	newnp->pktoptions = NULL;
1465 1466 1467 1468
	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
1469 1470 1471 1472
		if (newnp->pktoptions)
			skb_set_owner_r(newnp->pktoptions, newsk);
	}
	newnp->opt	  = NULL;
1473
	newnp->mcast_oif  = inet6_iif(skb);
1474
	newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487

	/* 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);
	}

1488
	inet_csk(newsk)->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
1489
	if (newnp->opt)
1490 1491
		inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
						     newnp->opt->opt_flen);
L
Linus Torvalds 已提交
1492

J
John Heffner 已提交
1493
	tcp_mtup_init(newsk);
L
Linus Torvalds 已提交
1494
	tcp_sync_mss(newsk, dst_mtu(dst));
1495
	newtp->advmss = dst_metric_advmss(dst);
L
Linus Torvalds 已提交
1496
	tcp_initialize_rcv_mss(newsk);
1497 1498 1499 1500
	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
1501

E
Eric Dumazet 已提交
1502 1503
	newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
	newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
L
Linus Torvalds 已提交
1504

1505 1506 1507 1508 1509 1510 1511 1512
#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
1513 1514
		char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
		if (newkey != NULL)
1515
			tcp_v6_md5_do_add(newsk, &newnp->daddr,
1516 1517 1518 1519
					  newkey, key->keylen);
	}
#endif

1520 1521 1522 1523
	if (__inet_inherit_port(sk, newsk) < 0) {
		sock_put(newsk);
		goto out;
	}
1524
	__inet6_hash(newsk, NULL);
L
Linus Torvalds 已提交
1525 1526 1527 1528

	return newsk;

out_overflow:
1529
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1530
out_nonewsk:
L
Linus Torvalds 已提交
1531 1532 1533
	if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
1534 1535
out:
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
L
Linus Torvalds 已提交
1536 1537 1538
	return NULL;
}

1539
static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
L
Linus Torvalds 已提交
1540
{
1541
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
H
Herbert Xu 已提交
1542
		if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1543
				  &ipv6_hdr(skb)->daddr, skb->csum)) {
1544
			skb->ip_summed = CHECKSUM_UNNECESSARY;
L
Linus Torvalds 已提交
1545
			return 0;
1546
		}
L
Linus Torvalds 已提交
1547
	}
1548

H
Herbert Xu 已提交
1549
	skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1550 1551
					      &ipv6_hdr(skb)->saddr,
					      &ipv6_hdr(skb)->daddr, 0));
1552

L
Linus Torvalds 已提交
1553
	if (skb->len <= 76) {
1554
		return __skb_checksum_complete(skb);
L
Linus Torvalds 已提交
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583
	}
	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);

1584 1585 1586 1587 1588
#ifdef CONFIG_TCP_MD5SIG
	if (tcp_v6_inbound_md5_hash (sk, skb))
		goto discard;
#endif

1589
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
		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.
1608
					       --ANK (980728)
L
Linus Torvalds 已提交
1609 1610 1611 1612 1613
	 */
	if (np->rxopt.all)
		opt_skb = skb_clone(skb, GFP_ATOMIC);

	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1614
		sock_rps_save_rxhash(sk, skb);
1615
		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1616 1617 1618 1619 1620 1621
			goto reset;
		if (opt_skb)
			goto ipv6_pktoptions;
		return 0;
	}

1622
	if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
L
Linus Torvalds 已提交
1623 1624
		goto csum_err;

1625
	if (sk->sk_state == TCP_LISTEN) {
L
Linus Torvalds 已提交
1626 1627 1628 1629 1630 1631 1632 1633 1634
		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..
		 */
1635
		if(nsk != sk) {
1636
			sock_rps_save_rxhash(nsk, skb);
L
Linus Torvalds 已提交
1637 1638 1639 1640 1641 1642
			if (tcp_child_process(sk, nsk, skb))
				goto reset;
			if (opt_skb)
				__kfree_skb(opt_skb);
			return 0;
		}
1643
	} else
1644
		sock_rps_save_rxhash(sk, skb);
L
Linus Torvalds 已提交
1645

1646
	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1647 1648 1649 1650 1651 1652
		goto reset;
	if (opt_skb)
		goto ipv6_pktoptions;
	return 0;

reset:
1653
	tcp_v6_send_reset(sk, skb);
L
Linus Torvalds 已提交
1654 1655 1656 1657 1658 1659
discard:
	if (opt_skb)
		__kfree_skb(opt_skb);
	kfree_skb(skb);
	return 0;
csum_err:
1660
	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
	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))) {
1675
		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1676
			np->mcast_oif = inet6_iif(opt_skb);
1677
		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1678
			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
L
Linus Torvalds 已提交
1679 1680 1681 1682 1683 1684 1685 1686 1687
		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);
		}
	}

1688
	kfree_skb(opt_skb);
L
Linus Torvalds 已提交
1689 1690 1691
	return 0;
}

1692
static int tcp_v6_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1693
{
1694
	const struct tcphdr *th;
1695
	const struct ipv6hdr *hdr;
L
Linus Torvalds 已提交
1696 1697
	struct sock *sk;
	int ret;
1698
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
1699 1700 1701 1702 1703 1704 1705

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

	/*
	 *	Count it even if it's bad.
	 */
1706
	TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
L
Linus Torvalds 已提交
1707 1708 1709 1710

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

1711
	th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1712 1713 1714 1715 1716 1717

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

1718
	if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
L
Linus Torvalds 已提交
1719 1720
		goto bad_packet;

1721
	th = tcp_hdr(skb);
1722
	hdr = ipv6_hdr(skb);
L
Linus Torvalds 已提交
1723 1724 1725 1726 1727
	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;
1728
	TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
L
Linus Torvalds 已提交
1729 1730
	TCP_SKB_CB(skb)->sacked = 0;

1731
	sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
L
Linus Torvalds 已提交
1732 1733 1734 1735 1736 1737 1738
	if (!sk)
		goto no_tcp_socket;

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

1739 1740 1741 1742 1743
	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
1744 1745 1746
	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto discard_and_relse;

1747
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1748 1749 1750 1751
		goto discard_and_relse;

	skb->dev = NULL;

1752
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1753 1754
	ret = 0;
	if (!sock_owned_by_user(sk)) {
C
Chris Leech 已提交
1755
#ifdef CONFIG_NET_DMA
1756
		struct tcp_sock *tp = tcp_sk(sk);
1757
		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1758
			tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
1759 1760 1761
		if (tp->ucopy.dma_chan)
			ret = tcp_v6_do_rcv(sk, skb);
		else
C
Chris Leech 已提交
1762 1763 1764 1765 1766
#endif
		{
			if (!tcp_prequeue(sk, skb))
				ret = tcp_v6_do_rcv(sk, skb);
		}
1767
	} else if (unlikely(sk_add_backlog(sk, skb))) {
Z
Zhu Yi 已提交
1768
		bh_unlock_sock(sk);
1769
		NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
Z
Zhu Yi 已提交
1770 1771
		goto discard_and_relse;
	}
L
Linus Torvalds 已提交
1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782
	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:
1783
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1784
	} else {
1785
		tcp_v6_send_reset(NULL, skb);
L
Linus Torvalds 已提交
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802
	}

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)) {
1803
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1804 1805 1806 1807
		goto discard_it;
	}

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1808
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1809
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1810 1811 1812
		goto discard_it;
	}

1813
	switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
L
Linus Torvalds 已提交
1814 1815 1816 1817
	case TCP_TW_SYN:
	{
		struct sock *sk2;

1818
		sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1819
					    &ipv6_hdr(skb)->daddr,
1820
					    ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1821
		if (sk2 != NULL) {
1822 1823 1824
			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
1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839
			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;
}

1840 1841
static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
{
1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
	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;
1854
		*release_it = false;
1855 1856 1857
	}

	return peer;
1858 1859 1860
}

static void *tcp_v6_tw_get_peer(struct sock *sk)
L
Linus Torvalds 已提交
1861
{
1862 1863
	const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
	const struct inet_timewait_sock *tw = inet_twsk(sk);
1864 1865 1866 1867

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

1868
	return inet_getpeer_v6(&tw6->tw_v6_daddr, 1);
L
Linus Torvalds 已提交
1869 1870
}

1871 1872 1873 1874 1875 1876 1877
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,
};

1878
static const struct inet_connection_sock_af_ops ipv6_specific = {
1879 1880 1881 1882 1883
	.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,
1884
	.get_peer	   = tcp_v6_get_peer,
1885 1886 1887 1888 1889
	.net_header_len	   = sizeof(struct ipv6hdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1890
	.bind_conflict	   = inet6_csk_bind_conflict,
1891
#ifdef CONFIG_COMPAT
1892 1893
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1894
#endif
L
Linus Torvalds 已提交
1895 1896
};

1897
#ifdef CONFIG_TCP_MD5SIG
1898
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1899
	.md5_lookup	=	tcp_v6_md5_lookup,
1900
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
1901 1902 1903
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1904
#endif
1905

L
Linus Torvalds 已提交
1906 1907 1908 1909
/*
 *	TCP over IPv4 via INET6 API
 */

1910
static const struct inet_connection_sock_af_ops ipv6_mapped = {
1911 1912 1913 1914 1915
	.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,
1916
	.get_peer	   = tcp_v4_get_peer,
1917 1918 1919 1920 1921
	.net_header_len	   = sizeof(struct iphdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1922
	.bind_conflict	   = inet6_csk_bind_conflict,
1923
#ifdef CONFIG_COMPAT
1924 1925
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1926
#endif
L
Linus Torvalds 已提交
1927 1928
};

1929
#ifdef CONFIG_TCP_MD5SIG
1930
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1931
	.md5_lookup	=	tcp_v4_md5_lookup,
1932
	.calc_md5_hash	=	tcp_v4_md5_hash_skb,
1933 1934 1935
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1936
#endif
1937

L
Linus Torvalds 已提交
1938 1939 1940 1941 1942
/* 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)
{
1943
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
1944 1945 1946 1947 1948 1949
	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);

1950
	icsk->icsk_rto = TCP_TIMEOUT_INIT;
L
Linus Torvalds 已提交
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962
	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
1963
	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
L
Linus Torvalds 已提交
1964
	tp->snd_cwnd_clamp = ~0;
1965
	tp->mss_cache = TCP_MSS_DEFAULT;
L
Linus Torvalds 已提交
1966 1967 1968 1969 1970

	tp->reordering = sysctl_tcp_reordering;

	sk->sk_state = TCP_CLOSE;

1971
	icsk->icsk_af_ops = &ipv6_specific;
1972
	icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1973
	icsk->icsk_sync_mss = tcp_sync_mss;
L
Linus Torvalds 已提交
1974 1975 1976
	sk->sk_write_space = sk_stream_write_space;
	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);

1977 1978 1979 1980
#ifdef CONFIG_TCP_MD5SIG
	tp->af_specific = &tcp_sock_ipv6_specific;
#endif

1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
	/* 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
1994 1995 1996
	sk->sk_sndbuf = sysctl_tcp_wmem[1];
	sk->sk_rcvbuf = sysctl_tcp_rmem[1];

H
Herbert Xu 已提交
1997
	local_bh_disable();
1998
	percpu_counter_inc(&tcp_sockets_allocated);
H
Herbert Xu 已提交
1999
	local_bh_enable();
L
Linus Torvalds 已提交
2000 2001 2002 2003

	return 0;
}

2004
static void tcp_v6_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
2005
{
2006 2007 2008 2009 2010
#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
2011
	tcp_v4_destroy_sock(sk);
2012
	inet6_destroy_sock(sk);
L
Linus Torvalds 已提交
2013 2014
}

2015
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
2016
/* Proc filesystem TCPv6 sock list dumping. */
2017
static void get_openreq6(struct seq_file *seq,
2018
			 const struct sock *sk, struct request_sock *req, int i, int uid)
L
Linus Torvalds 已提交
2019 2020
{
	int ttd = req->expires - jiffies;
2021 2022
	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
2023 2024 2025 2026 2027 2028

	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
2029
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
L
Linus Torvalds 已提交
2030 2031 2032
		   i,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3],
2033
		   ntohs(inet_rsk(req)->loc_port),
L
Linus Torvalds 已提交
2034 2035
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3],
2036
		   ntohs(inet_rsk(req)->rmt_port),
L
Linus Torvalds 已提交
2037 2038
		   TCP_SYN_RECV,
		   0,0, /* could print option size, but that is af dependent. */
2039 2040
		   1,   /* timers active (only the expire timer) */
		   jiffies_to_clock_t(ttd),
L
Linus Torvalds 已提交
2041 2042
		   req->retrans,
		   uid,
2043
		   0,  /* non standard timer */
L
Linus Torvalds 已提交
2044 2045 2046 2047 2048 2049
		   0, /* open_requests have no inode */
		   0, req);
}

static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
{
2050
	const struct in6_addr *dest, *src;
L
Linus Torvalds 已提交
2051 2052 2053
	__u16 destp, srcp;
	int timer_active;
	unsigned long timer_expires;
2054 2055
	const struct inet_sock *inet = inet_sk(sp);
	const struct tcp_sock *tp = tcp_sk(sp);
2056
	const struct inet_connection_sock *icsk = inet_csk(sp);
2057
	const struct ipv6_pinfo *np = inet6_sk(sp);
L
Linus Torvalds 已提交
2058 2059 2060

	dest  = &np->daddr;
	src   = &np->rcv_saddr;
E
Eric Dumazet 已提交
2061 2062
	destp = ntohs(inet->inet_dport);
	srcp  = ntohs(inet->inet_sport);
2063 2064

	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
L
Linus Torvalds 已提交
2065
		timer_active	= 1;
2066 2067
		timer_expires	= icsk->icsk_timeout;
	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
L
Linus Torvalds 已提交
2068
		timer_active	= 4;
2069
		timer_expires	= icsk->icsk_timeout;
L
Linus Torvalds 已提交
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
	} 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
2080
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n",
L
Linus Torvalds 已提交
2081 2082 2083 2084 2085
		   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,
2086
		   sp->sk_state,
2087 2088
		   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
2089 2090
		   timer_active,
		   jiffies_to_clock_t(timer_expires - jiffies),
2091
		   icsk->icsk_retransmits,
L
Linus Torvalds 已提交
2092
		   sock_i_uid(sp),
2093
		   icsk->icsk_probes_out,
L
Linus Torvalds 已提交
2094 2095
		   sock_i_ino(sp),
		   atomic_read(&sp->sk_refcnt), sp,
2096 2097
		   jiffies_to_clock_t(icsk->icsk_rto),
		   jiffies_to_clock_t(icsk->icsk_ack.ato),
2098
		   (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
I
Ilpo Järvinen 已提交
2099 2100
		   tp->snd_cwnd,
		   tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
L
Linus Torvalds 已提交
2101 2102 2103
		   );
}

2104
static void get_timewait6_sock(struct seq_file *seq,
2105
			       struct inet_timewait_sock *tw, int i)
L
Linus Torvalds 已提交
2106
{
2107
	const struct in6_addr *dest, *src;
L
Linus Torvalds 已提交
2108
	__u16 destp, srcp;
2109
	const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
L
Linus Torvalds 已提交
2110 2111 2112 2113 2114
	int ttd = tw->tw_ttd - jiffies;

	if (ttd < 0)
		ttd = 0;

2115 2116
	dest = &tw6->tw_v6_daddr;
	src  = &tw6->tw_v6_rcv_saddr;
L
Linus Torvalds 已提交
2117 2118 2119 2120 2121
	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
2122
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
L
Linus Torvalds 已提交
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 2159 2160 2161 2162 2163
		   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;
}

2164 2165 2166 2167 2168 2169 2170 2171
static const struct file_operations tcp6_afinfo_seq_fops = {
	.owner   = THIS_MODULE,
	.open    = tcp_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_net
};

L
Linus Torvalds 已提交
2172 2173 2174
static struct tcp_seq_afinfo tcp6_seq_afinfo = {
	.name		= "tcp6",
	.family		= AF_INET6,
2175
	.seq_fops	= &tcp6_afinfo_seq_fops,
2176 2177 2178
	.seq_ops	= {
		.show		= tcp6_seq_show,
	},
L
Linus Torvalds 已提交
2179 2180
};

2181
int __net_init tcp6_proc_init(struct net *net)
L
Linus Torvalds 已提交
2182
{
2183
	return tcp_proc_register(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2184 2185
}

2186
void tcp6_proc_exit(struct net *net)
L
Linus Torvalds 已提交
2187
{
2188
	tcp_proc_unregister(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2189 2190 2191 2192 2193 2194 2195 2196 2197
}
#endif

struct proto tcpv6_prot = {
	.name			= "TCPv6",
	.owner			= THIS_MODULE,
	.close			= tcp_close,
	.connect		= tcp_v6_connect,
	.disconnect		= tcp_disconnect,
2198
	.accept			= inet_csk_accept,
L
Linus Torvalds 已提交
2199 2200 2201 2202 2203 2204 2205
	.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,
2206 2207
	.sendmsg		= tcp_sendmsg,
	.sendpage		= tcp_sendpage,
L
Linus Torvalds 已提交
2208 2209
	.backlog_rcv		= tcp_v6_do_rcv,
	.hash			= tcp_v6_hash,
2210 2211
	.unhash			= inet_unhash,
	.get_port		= inet_csk_get_port,
L
Linus Torvalds 已提交
2212 2213 2214 2215
	.enter_memory_pressure	= tcp_enter_memory_pressure,
	.sockets_allocated	= &tcp_sockets_allocated,
	.memory_allocated	= &tcp_memory_allocated,
	.memory_pressure	= &tcp_memory_pressure,
2216
	.orphan_count		= &tcp_orphan_count,
L
Linus Torvalds 已提交
2217 2218 2219 2220 2221
	.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),
2222
	.slab_flags		= SLAB_DESTROY_BY_RCU,
2223
	.twsk_prot		= &tcp6_timewait_sock_ops,
2224
	.rsk_prot		= &tcp6_request_sock_ops,
2225
	.h.hashinfo		= &tcp_hashinfo,
2226
	.no_autobind		= true,
2227 2228 2229 2230
#ifdef CONFIG_COMPAT
	.compat_setsockopt	= compat_tcp_setsockopt,
	.compat_getsockopt	= compat_tcp_getsockopt,
#endif
L
Linus Torvalds 已提交
2231 2232
};

2233
static const struct inet6_protocol tcpv6_protocol = {
L
Linus Torvalds 已提交
2234 2235
	.handler	=	tcp_v6_rcv,
	.err_handler	=	tcp_v6_err,
2236
	.gso_send_check	=	tcp_v6_gso_send_check,
H
Herbert Xu 已提交
2237
	.gso_segment	=	tcp_tso_segment,
H
Herbert Xu 已提交
2238 2239
	.gro_receive	=	tcp6_gro_receive,
	.gro_complete	=	tcp6_gro_complete,
L
Linus Torvalds 已提交
2240 2241 2242 2243 2244 2245 2246 2247 2248
	.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,
2249 2250
	.flags		=	INET_PROTOSW_PERMANENT |
				INET_PROTOSW_ICSK,
L
Linus Torvalds 已提交
2251 2252
};

2253
static int __net_init tcpv6_net_init(struct net *net)
2254
{
2255 2256
	return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
				    SOCK_RAW, IPPROTO_TCP, net);
2257 2258
}

2259
static void __net_exit tcpv6_net_exit(struct net *net)
2260
{
2261
	inet_ctl_sock_destroy(net->ipv6.tcp_sk);
E
Eric W. Biederman 已提交
2262 2263
}

2264
static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
E
Eric W. Biederman 已提交
2265 2266
{
	inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
2267 2268 2269
}

static struct pernet_operations tcpv6_net_ops = {
E
Eric W. Biederman 已提交
2270 2271 2272
	.init	    = tcpv6_net_init,
	.exit	    = tcpv6_net_exit,
	.exit_batch = tcpv6_net_exit_batch,
2273 2274
};

2275
int __init tcpv6_init(void)
L
Linus Torvalds 已提交
2276
{
2277 2278 2279 2280 2281 2282
	int ret;

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

L
Linus Torvalds 已提交
2283
	/* register inet6 protocol */
2284 2285 2286 2287
	ret = inet6_register_protosw(&tcpv6_protosw);
	if (ret)
		goto out_tcpv6_protocol;

2288
	ret = register_pernet_subsys(&tcpv6_net_ops);
2289 2290 2291 2292
	if (ret)
		goto out_tcpv6_protosw;
out:
	return ret;
2293

2294 2295 2296 2297 2298 2299 2300
out_tcpv6_protocol:
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
out_tcpv6_protosw:
	inet6_unregister_protosw(&tcpv6_protosw);
	goto out;
}

2301
void tcpv6_exit(void)
2302
{
2303
	unregister_pernet_subsys(&tcpv6_net_ops);
2304 2305
	inet6_unregister_protosw(&tcpv6_protosw);
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
L
Linus Torvalds 已提交
2306
}