cregit-Linux how code gets into the kernel

Release 4.14 net/ipv6/tcp_ipv6.c

Directory: net/ipv6
/*
 *      TCP over IPv6
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *
 *      Based on:
 *      linux/net/ipv4/tcp.c
 *      linux/net/ipv4/tcp_input.c
 *      linux/net/ipv4/tcp_output.c
 *
 *      Fixes:
 *      Hideaki YOSHIFUJI       :       sin6_scope_id support
 *      YOSHIFUJI Hideaki @USAGI and:   Support IPV6_V6ONLY socket option, which
 *      Alexey Kuznetsov                allow both IPv4 and IPv6 sockets to bind
 *                                      a single port at the same time.
 *      YOSHIFUJI Hideaki @USAGI:       convert /proc/net/tcp6 to seq_file.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/bottom_half.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/jiffies.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/jhash.h>
#include <linux/ipsec.h>
#include <linux/times.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>

#include <net/tcp.h>
#include <net/ndisc.h>
#include <net/inet6_hashtables.h>
#include <net/inet6_connection_sock.h>
#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>
#include <net/timewait_sock.h>
#include <net/inet_common.h>
#include <net/secure_seq.h>
#include <net/busy_poll.h>

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

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

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

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


static const struct inet_connection_sock_af_ops ipv6_mapped;

static const struct inet_connection_sock_af_ops ipv6_specific;
#ifdef CONFIG_TCP_MD5SIG

static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;

static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
#else



static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
						   const struct in6_addr *addr)
{
	return NULL;
}

Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明2191.30%133.33%


Eric Dumazet28.70%266.67%


Total23100.00%3100.00%



#endif




static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);

	if (dst && dst_hold_safe(dst)) {
		const struct rt6_info *rt = (const struct rt6_info *)dst;

		sk->sk_rx_dst = dst;
		inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
		inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Neal Cardwell6782.72%125.00%


Eric Dumazet1113.58%250.00%


Martin KaFai Lau33.70%125.00%


Total81100.00%4100.00%






static u32 tcp_v6_init_seq(const struct sk_buff *skb)
{
	return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32,
				ipv6_hdr(skb)->saddr.s6_addr32,
				tcp_hdr(skb)->dest,
				tcp_hdr(skb)->source);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2960.42%337.50%


Arnaldo Carvalho de Melo1225.00%225.00%


Eric Dumazet612.50%225.00%


Florian Westphal12.08%112.50%


Total48100.00%8100.00%






static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb)
{
	return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32,
				   ipv6_hdr(skb)->saddr.s6_addr32);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet3890.48%240.00%


Linus Torvalds (pre-git)37.14%240.00%


Florian Westphal12.38%120.00%


Total42100.00%5100.00%






static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
			  int addr_len)
{
	struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
	struct inet_sock *inet = inet_sk(sk);
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
	struct in6_addr *saddr = NULL, *final_p, final;
	struct ipv6_txoptions *opt;
	struct flowi6 fl6;
	struct dst_entry *dst;
	int addr_type;
	int err;
	struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row;

	if (addr_len < SIN6_LEN_RFC2133)
		return -EINVAL;

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

	memset(&fl6, 0, sizeof(fl6));

	if (np->sndflow) {
		fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
		IP6_ECN_flow_init(fl6.flowlabel);
		if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
			struct ip6_flowlabel *flowlabel;
			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
			if (!flowlabel)
				return -EINVAL;
			fl6_sock_release(flowlabel);
		}
	}

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

	if (ipv6_addr_any(&usin->sin6_addr)) {
		if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
			ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
					       &usin->sin6_addr);
		else
			usin->sin6_addr = in6addr_loopback;
	}

	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(&sk->sk_v6_daddr, &usin->sin6_addr)) {
		tp->rx_opt.ts_recent = 0;
		tp->rx_opt.ts_recent_stamp = 0;
		tp->write_seq = 0;
	}

	sk->sk_v6_daddr = usin->sin6_addr;
	np->flow_label = fl6.flowlabel;

	/*
         *      TCP over IPv4
         */

	if (addr_type & IPV6_ADDR_MAPPED) {
		u32 exthdrlen = icsk->icsk_ext_hdr_len;
		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];

		icsk->icsk_af_ops = &ipv6_mapped;
		sk->sk_backlog_rcv = tcp_v4_do_rcv;
#ifdef CONFIG_TCP_MD5SIG
		tp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

		err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));

		if (err) {
			icsk->icsk_ext_hdr_len = exthdrlen;
			icsk->icsk_af_ops = &ipv6_specific;
			sk->sk_backlog_rcv = tcp_v6_do_rcv;
#ifdef CONFIG_TCP_MD5SIG
			tp->af_specific = &tcp_sock_ipv6_specific;
#endif
			goto failure;
		}
		np->saddr = sk->sk_v6_rcv_saddr;

		return err;
	}

	if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
		saddr = &sk->sk_v6_rcv_saddr;

	fl6.flowi6_proto = IPPROTO_TCP;
	fl6.daddr = sk->sk_v6_daddr;
	fl6.saddr = saddr ? *saddr : np->saddr;
	fl6.flowi6_oif = sk->sk_bound_dev_if;
	fl6.flowi6_mark = sk->sk_mark;
	fl6.fl6_dport = usin->sin6_port;
	fl6.fl6_sport = inet->inet_sport;
	fl6.flowi6_uid = sk->sk_uid;

	opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
	final_p = fl6_update_dst(&fl6, opt, &final);

	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));

	dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
		goto failure;
	}

	if (!saddr) {
		saddr = &fl6.saddr;
		sk->sk_v6_rcv_saddr = *saddr;
	}

	/* set the source address */
	np->saddr = *saddr;
	inet->inet_rcv_saddr = LOOPBACK4_IPV6;

	sk->sk_gso_type = SKB_GSO_TCPV6;
	ip6_dst_store(sk, dst, NULL, NULL);

	icsk->icsk_ext_hdr_len = 0;
	if (opt)
		icsk->icsk_ext_hdr_len = opt->opt_flen +
					 opt->opt_nflen;

	tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);

	inet->inet_dport = usin->sin6_port;

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

	sk_set_txhash(sk);

	if (likely(!tp->repair)) {
		if (!tp->write_seq)
			tp->write_seq = secure_tcpv6_seq(np->saddr.s6_addr32,
							 sk->sk_v6_daddr.s6_addr32,
							 inet->inet_sport,
							 inet->inet_dport);
		tp->tsoffset = secure_tcpv6_ts_off(sock_net(sk),
						   np->saddr.s6_addr32,
						   sk->sk_v6_daddr.s6_addr32);
	}

	if (tcp_fastopen_defer_connect(sk, &err))
		return err;
	if (err)
		goto late_failure;

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

	return 0;

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


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)52453.14%1421.88%


David S. Miller899.03%710.94%


Eric Dumazet737.40%710.94%


Arnaldo Carvalho de Melo444.46%710.94%


Hideaki Yoshifuji / 吉藤英明404.06%57.81%


Jonathan T. Leighton282.84%11.56%


Alexey Kuznetsov272.74%11.56%


Linus Torvalds242.43%34.69%


Kazunori Miyazawa212.13%11.56%


Wei Wang181.83%11.56%


Haishuang Yan151.52%11.56%


Ville Nuorvala141.42%23.12%


Alexey Dobriyan131.32%23.12%


Alexey Kodanev80.81%11.56%


Lorenzo Colitti80.81%11.56%


Andrey Vagin70.71%11.56%


Venkat Yekkirala70.71%11.56%


Brian Haley60.61%23.12%


Arnaud Ebalard60.61%11.56%


Herbert Xu60.61%11.56%


Sathya Perla40.41%11.56%


Ian Morris20.20%11.56%


Tom Herbert10.10%11.56%


Hannes Frederic Sowa10.10%11.56%


Total986100.00%64100.00%






static void tcp_v6_mtu_reduced(struct sock *sk)
{
	struct dst_entry *dst;

	if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
		return;

	dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info);
	if (!dst)
		return;

	if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
		tcp_sync_mss(sk, dst_mtu(dst));
		tcp_simple_retransmit(sk);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet84100.00%1100.00%


Total84100.00%1100.00%






static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
		u8 type, u8 code, int offset, __be32 info)
{
	const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
	const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
	struct net *net = dev_net(skb->dev);
	struct request_sock *fastopen;
	struct ipv6_pinfo *np;
	struct tcp_sock *tp;
	__u32 seq, snd_una;
	struct sock *sk;
	bool fatal;
	int err;

	sk = __inet6_lookup_established(net, &tcp_hashinfo,
					&hdr->daddr, th->dest,
					&hdr->saddr, ntohs(th->source),
					skb->dev->ifindex, inet6_sdif(skb));

	if (!sk) {
		__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
				  ICMP6_MIB_INERRORS);
		return;
	}

	if (sk->sk_state == TCP_TIME_WAIT) {
		inet_twsk_put(inet_twsk(sk));
		return;
	}
	seq = ntohl(th->seq);
	fatal = icmpv6_err_convert(type, code, &err);
	if (sk->sk_state == TCP_NEW_SYN_RECV)
		return tcp_req_err(sk, seq, fatal);

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
		__NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);

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

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

	tp = tcp_sk(sk);
	/* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */
	fastopen = tp->fastopen_rsk;
	snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una;
	if (sk->sk_state != TCP_LISTEN &&
	    !between(seq, snd_una, tp->snd_nxt)) {
		__NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS);
		goto out;
	}

	np = inet6_sk(sk);

	if (type == NDISC_REDIRECT) {
		if (!sock_owned_by_user(sk)) {
			struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);

			if (dst)
				dst->ops->redirect(dst, sk, skb);
		}
		goto out;
	}

	if (type == ICMPV6_PKT_TOOBIG) {
		/* We are not interested in TCP_LISTEN and open_requests
                 * (SYN-ACKs send out by Linux are always <576bytes so
                 * they should go through unfragmented).
                 */
		if (sk->sk_state == TCP_LISTEN)
			goto out;

		if (!ip6_sk_accept_pmtu(sk))
			goto out;

		tp->mtu_info = ntohl(info);
		if (!sock_owned_by_user(sk))
			tcp_v6_mtu_reduced(sk);
		else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
					   &sk->sk_tsq_flags))
			sock_hold(sk);
		goto out;
	}


	/* Might be for an request_sock */
	switch (sk->sk_state) {
	case TCP_SYN_SENT:
	case TCP_SYN_RECV:
		/* Only in fast or simultaneous open. If a fast open socket is
                 * is already accepted it is treated as a connected one below.
                 */
		if (fastopen && !fastopen->sk)
			break;

		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);
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)25142.11%1019.61%


Eric Dumazet9916.61%815.69%


David S. Miller498.22%59.80%


Yuchung Cheng376.21%11.96%


Stephen Hemminger274.53%11.96%


Linus Torvalds233.86%11.96%


Arnaldo Carvalho de Melo193.19%59.80%


Pavel Emelyanov122.01%35.88%


Hannes Frederic Sowa111.85%11.96%


Benjamin LaHaise111.85%11.96%


Julian Anastasov101.68%11.96%


Jon Maxwell101.68%11.96%


Randy Dunlap71.17%11.96%


Alexey Kuznetsov61.01%11.96%


Hideaki Yoshifuji / 吉藤英明61.01%23.92%


David Ahern50.84%11.96%


Christoph Paasch30.50%11.96%


Brian Haley20.34%11.96%


Denis V. Lunev20.34%11.96%


Kazunori Miyazawa20.34%11.96%


Venkat Yekkirala10.17%11.96%


Al Viro10.17%11.96%


Ian Morris10.17%11.96%


Stephen Rothwell10.17%11.96%


Total596100.00%51100.00%






static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
			      struct flowi *fl,
			      struct request_sock *req,
			      struct tcp_fastopen_cookie *foc,
			      enum tcp_synack_type synack_type)
{
	struct inet_request_sock *ireq = inet_rsk(req);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct ipv6_txoptions *opt;
	struct flowi6 *fl6 = &fl->u.ip6;
	struct sk_buff *skb;
	int err = -ENOMEM;

	/* First, grab a route. */
	if (!dst && (dst = inet6_csk_route_req(sk, fl6, req,
					       IPPROTO_TCP)) == NULL)
		goto done;

	skb = tcp_make_synack(sk, dst, req, foc, synack_type);

	if (skb) {
		__tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
				    &ireq->ir_v6_rmt_addr);

		fl6->daddr = ireq->ir_v6_rmt_addr;
		if (np->repflow && ireq->pktopts)
			fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));

		rcu_read_lock();
		opt = ireq->ipv6_opt;
		if (!opt)
			opt = rcu_dereference(np->opt);
		err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass);
		rcu_read_unlock();
		err = net_xmit_eval(err);
	}

done:
	return err;
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7531.65%27.41%


Eric Dumazet2811.81%725.93%


Huw Davies2510.55%13.70%


Florent Fourcot2410.13%13.70%


Neal Cardwell2410.13%27.41%


David S. Miller166.75%311.11%


Octavian Purdila145.91%13.70%


Arnaldo Carvalho de Melo93.80%311.11%


Daniel Lee52.11%13.70%


Kazunori Miyazawa52.11%13.70%


Pablo Neira Ayuso41.69%13.70%


Gerrit Renker41.69%13.70%


William Allen Simpson20.84%13.70%


Herbert Xu10.42%13.70%


Alexey Dobriyan10.42%13.70%


Total237100.00%27100.00%






static void tcp_v6_reqsk_destructor(struct request_sock *req)
{
	kfree(inet_rsk(req)->ipv6_opt);
	kfree_skb(inet_rsk(req)->pktopts);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1651.61%120.00%


Huw Davies1032.26%120.00%


Arnaldo Carvalho de Melo412.90%240.00%


Eric Dumazet13.23%120.00%


Total31100.00%5100.00%



#ifdef CONFIG_TCP_MD5SIG



static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
						   const struct in6_addr *addr)
{
	return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1337.14%233.33%


Eric Dumazet1131.43%350.00%


Hideaki Yoshifuji / 吉藤英明1131.43%116.67%


Total35100.00%6100.00%






static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
						const struct sock *addr_sk)
{
	return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明1651.61%120.00%


Eric Dumazet1548.39%480.00%


Total31100.00%5100.00%






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

	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 (optname == TCP_MD5SIG_EXT &&
	    cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) {
		prefixlen = cmd.tcpm_prefixlen;
		if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) &&
					prefixlen > 32))
			return -EINVAL;
	} else {
		prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128;
	}

	if (!cmd.tcpm_keylen) {
		if (ipv6_addr_v4mapped(&sin6->sin6_addr))
			return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
					      AF_INET, prefixlen);
		return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
				      AF_INET6, prefixlen);
	}

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

	if (ipv6_addr_v4mapped(&sin6->sin6_addr))
		return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
				      AF_INET, prefixlen, cmd.tcpm_key,
				      cmd.tcpm_keylen, GFP_KERNEL);

	return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
			      AF_INET6, prefixlen, cmd.tcpm_key,
			      cmd.tcpm_keylen, GFP_KERNEL);
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明17959.67%120.00%


Ivan Delalande7525.00%240.00%


Eric Dumazet4414.67%120.00%


Brian Haley20.67%120.00%


Total300100.00%5100.00%






static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
				   const struct in6_addr *daddr,
				   const struct in6_addr *saddr,
				   const struct tcphdr *th, int nbytes)
{
	struct tcp6_pseudohdr *bp;
	struct scatterlist sg;
	struct tcphdr *_th;

	bp = hp->scratch;
	/* 1. TCP pseudo-header (RFC2460) */
	bp->saddr = *saddr;
	bp->daddr = *daddr;
	bp->protocol = cpu_to_be32(IPPROTO_TCP);
	bp->len = cpu_to_be32(nbytes);

	_th = (struct tcphdr *)(bp + 1);
	memcpy(_th, th, sizeof(*th));
	_th->check = 0;

	sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
	ahash_request_set_crypt(hp->md5_req, &sg, NULL,
				sizeof(*bp) + sizeof(*th));
	return crypto_ahash_update(hp->md5_req);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet5934.91%225.00%


Hideaki Yoshifuji / 吉藤英明5834.32%112.50%


Adam Langley3420.12%225.00%


Herbert Xu127.10%112.50%


Alexey Dobriyan42.37%112.50%


David S. Miller21.18%112.50%


Total169100.00%8100.00%






static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
			       const struct in6_addr *daddr, struct in6_addr *saddr,
			       const struct tcphdr *th)
{
	struct tcp_md5sig_pool *hp;
	struct ahash_request *req;

	hp = tcp_get_md5sig_pool();
	if (!hp)
		goto clear_hash_noput;
	req = hp->md5_req;

	if (crypto_ahash_init(req))
		goto clear_hash;
	if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
		goto clear_hash;
	if (tcp_md5_hash_key(hp, key))
		goto clear_hash;
	ahash_request_set_crypt(req, NULL, md5_hash, 0)