Release 4.11 net/ipv6/datagram.c

/*
 *      common UDP/RAW code
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *
 *      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/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <linux/route.h>
#include <linux/slab.h>
#include <linux/export.h>

#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/tcp_states.h>
#include <net/dsfield.h>

#include <linux/errqueue.h>
#include <linux/uaccess.h>



static bool ipv6_mapped_addr_any(const struct in6_addr *a)
{
	return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
}

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29
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2
100.00%



static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
{
	struct inet_sock *inet = inet_sk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);

	memset(fl6, 0, sizeof(*fl6));
	fl6->flowi6_proto = sk->sk_protocol;
	fl6->daddr = sk->sk_v6_daddr;
	fl6->saddr = np->saddr;
	fl6->flowi6_oif = sk->sk_bound_dev_if;
	fl6->flowi6_mark = sk->sk_mark;
	fl6->fl6_dport = inet->inet_dport;
	fl6->fl6_sport = inet->inet_sport;
	fl6->flowlabel = np->flow_label;
	fl6->flowi6_uid = sk->sk_uid;

	if (!fl6->flowi6_oif)
		fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;

	if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr))
		fl6->flowi6_oif = np->mcast_oif;

	security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
}

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27
15.79%
1
20.00%
Lorenzo Colitti
8
4.68%
1
20.00%
Arnaldo Carvalho de Melo
1
0.58%
1
20.00%
Eric Dumazet
1
0.58%
1
20.00%
Total
171
100.00%
5
100.00%



int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
{
	struct ip6_flowlabel *flowlabel = NULL;
	struct in6_addr *final_p, final;
	struct ipv6_txoptions *opt;
	struct dst_entry *dst;
	struct inet_sock *inet = inet_sk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct flowi6 fl6;
	int err = 0;

	if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
		flowlabel = fl6_sock_lookup(sk, np->flow_label);
		if (!flowlabel)
			return -EINVAL;
	}
	ip6_datagram_flow_key_init(&fl6, sk);

	rcu_read_lock();
	opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
	final_p = fl6_update_dst(&fl6, opt, &final);
	rcu_read_unlock();

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

	if (fix_sk_saddr) {
		if (ipv6_addr_any(&np->saddr))
			np->saddr = fl6.saddr;

		if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
			sk->sk_v6_rcv_saddr = fl6.saddr;
			inet->inet_rcv_saddr = LOOPBACK4_IPV6;
			if (sk->sk_prot->rehash)
				sk->sk_prot->rehash(sk);
		}
	}

	ip6_dst_store(sk, dst,
		      ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
		      &sk->sk_v6_daddr : NULL,
#ifdef CONFIG_IPV6_SUBTREES
		      ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
		      &np->saddr :
#endif
		      NULL);

out:
	fl6_sock_release(flowlabel);
	return err;
}

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8.33%
Eric Dumazet
23
7.57%
3
25.00%
Arnaud Ebalard
3
0.99%
1
8.33%
Kazunori Miyazawa
3
0.99%
1
8.33%
David S. Miller
2
0.66%
1
8.33%
Hannes Frederic Sowa
2
0.66%
1
8.33%
Brian Haley
2
0.66%
1
8.33%
Max Matveev
1
0.33%
1
8.33%
Total
304
100.00%
12
100.00%



void ip6_datagram_release_cb(struct sock *sk)
{
	struct dst_entry *dst;

	if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
		return;

	rcu_read_lock();
	dst = __sk_dst_get(sk);
	if (!dst || !dst->obsolete ||
	    dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
		rcu_read_unlock();
		return;
	}
	rcu_read_unlock();

	ip6_datagram_dst_update(sk, false);
}
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1
1.28%
1
33.33%
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3
100.00%


EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);



int __ip6_datagram_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 ipv6_pinfo	*np = inet6_sk(sk);
	struct in6_addr		*daddr;
	int			addr_type;
	int			err;
	__be32			fl6_flowlabel = 0;

	if (usin->sin6_family == AF_INET) {
		if (__ipv6_only_sock(sk))
			return -EAFNOSUPPORT;
		err = __ip4_datagram_connect(sk, uaddr, addr_len);
		goto ipv4_connected;
	}

	if (addr_len < SIN6_LEN_RFC2133)
		return -EINVAL;

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

	if (np->sndflow)
		fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;

	if (ipv6_addr_any(&usin->sin6_addr)) {
		/*
                 *      connect to self
                 */
		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);

	daddr = &usin->sin6_addr;

	if (addr_type & IPV6_ADDR_MAPPED) {
		struct sockaddr_in sin;

		if (__ipv6_only_sock(sk)) {
			err = -ENETUNREACH;
			goto out;
		}
		sin.sin_family = AF_INET;
		sin.sin_addr.s_addr = daddr->s6_addr32[3];
		sin.sin_port = usin->sin6_port;

		err = __ip4_datagram_connect(sk,
					     (struct sockaddr *) &sin,
					     sizeof(sin));

ipv4_connected:
		if (err)
			goto out;

		ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);

		if (ipv6_addr_any(&np->saddr) ||
		    ipv6_mapped_addr_any(&np->saddr))
			ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);

		if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
		    ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
			ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
					       &sk->sk_v6_rcv_saddr);
			if (sk->sk_prot->rehash)
				sk->sk_prot->rehash(sk);
		}

		goto out;
	}

	if (__ipv6_addr_needs_scope_id(addr_type)) {
		if (addr_len >= sizeof(struct sockaddr_in6) &&
		    usin->sin6_scope_id) {
			if (sk->sk_bound_dev_if &&
			    sk->sk_bound_dev_if != usin->sin6_scope_id) {
				err = -EINVAL;
				goto out;
			}
			sk->sk_bound_dev_if = usin->sin6_scope_id;
		}

		if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
			sk->sk_bound_dev_if = np->mcast_oif;

		/* Connect to link-local address requires an interface */
		if (!sk->sk_bound_dev_if) {
			err = -EINVAL;
			goto out;
		}
	}

	sk->sk_v6_daddr = *daddr;
	np->flow_label = fl6_flowlabel;

	inet->inet_dport = usin->sin6_port;

	/*
         *      Check for a route to destination an obtain the
         *      destination cache for it.
         */

	err = ip6_datagram_dst_update(sk, true);
	if (err)
		goto out;

	sk->sk_state = TCP_ESTABLISHED;
	sk_set_txhash(sk);
out:
	return err;
}
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15
2.85%
3
11.11%
Martin KaFai Lau
12
2.28%
3
11.11%
Kazunori Miyazawa
10
1.90%
1
3.70%
Max Matveev
10
1.90%
1
3.70%
Alexey Dobriyan
6
1.14%
2
7.41%
Tom Herbert
5
0.95%
2
7.41%
Venkat Yekkirala
4
0.76%
1
3.70%
David S. Miller
3
0.57%
2
7.41%
Arnaud Ebalard
3
0.57%
1
3.70%
Paolo Abeni
3
0.57%
1
3.70%
Hannes Frederic Sowa
2
0.38%
1
3.70%
Arnaldo Carvalho de Melo
1
0.19%
1
3.70%
Total
526
100.00%
27
100.00%


EXPORT_SYMBOL_GPL(__ip6_datagram_connect);



int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
	int res;

	lock_sock(sk);
	res = __ip6_datagram_connect(sk, uaddr, addr_len);
	release_sock(sk);
	return res;
}
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EXPORT_SYMBOL_GPL(ip6_datagram_connect);



int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
				 int addr_len)
{
	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
	if (sin6->sin6_family != AF_INET6)
		return -EAFNOSUPPORT;
	return ip6_datagram_connect(sk, uaddr, addr_len);
}
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EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);



void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
		     __be16 port, u32 info, u8 *payload)
{
	struct ipv6_pinfo *np  = inet6_sk(sk);
	struct icmp6hdr *icmph = icmp6_hdr(skb);
	struct sock_exterr_skb *serr;

	if (!np->recverr)
		return;

	skb = skb_clone(skb, GFP_ATOMIC);
	if (!skb)
		return;

	skb->protocol = htons(ETH_P_IPV6);

	serr = SKB_EXT_ERR(skb);
	serr->ee.ee_errno = err;
	serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
	serr->ee.ee_type = icmph->icmp6_type;
	serr->ee.ee_code = icmph->icmp6_code;
	serr->ee.ee_pad = 0;
	serr->ee.ee_info = info;
	serr->ee.ee_data = 0;
	serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
				  skb_network_header(skb);
	serr->port = port;

	__skb_pull(skb, payload - skb->data);
	skb_reset_transport_header(skb);

	if (sock_queue_err_skb(sk, skb))
		kfree_skb(skb);
}

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11
5.02%
3
37.50%
Brian Haley
9
4.11%
1
12.50%
Linus Torvalds
1
0.46%
1
12.50%
Al Viro
1
0.46%
1
12.50%
Total
219
100.00%
8
100.00%



void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
{
	const struct ipv6_pinfo *np = inet6_sk(sk);
	struct sock_exterr_skb *serr;
	struct ipv6hdr *iph;
	struct sk_buff *skb;

	if (!np->recverr)
		return;

	skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
	if (!skb)
		return;

	skb->protocol = htons(ETH_P_IPV6);

	skb_put(skb, sizeof(struct ipv6hdr));
	skb_reset_network_header(skb);
	iph = ipv6_hdr(skb);
	iph->daddr = fl6->daddr;

	serr = SKB_EXT_ERR(skb);
	serr->ee.ee_errno = err;
	serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
	serr->ee.ee_type = 0;
	serr->ee.ee_code = 0;
	serr->ee.ee_pad = 0;
	serr->ee.ee_info = info;
	serr->ee.ee_data = 0;
	serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
	serr->port = fl6->fl6_dport;

	__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
	skb_reset_transport_header(skb);

	if (sock_queue_err_skb(sk, skb))
		kfree_skb(skb);
}

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21
8.90%
5
38.46%
David S. Miller
17
7.20%
3
23.08%
Brian Haley
9
3.81%
1
7.69%
Alexey Dobriyan
1
0.42%
1
7.69%
Linus Torvalds
1
0.42%
1
7.69%
Eric Dumazet
1
0.42%
1
7.69%
Total
236
100.00%
13
100.00%



void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct ipv6hdr *iph;
	struct sk_buff *skb;
	struct ip6_mtuinfo *mtu_info;

	if (!np->rxopt.bits.rxpmtu)
		return;

	skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
	if (!skb)
		return;

	skb_put(skb, sizeof(struct ipv6hdr));
	skb_reset_network_header(skb);
	iph = ipv6_hdr(skb);
	iph->daddr = fl6->daddr;

	mtu_info = IP6CBMTU(skb);

	mtu_info->ip6m_mtu = mtu;
	mtu_info->ip6m_addr.sin6_family = AF_INET6;
	mtu_info->ip6m_addr.sin6_port = 0;
	mtu_info->ip6m_addr.sin6_flowinfo = 0;
	mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
	mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;

	__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
	skb_reset_transport_header(skb);

	skb = xchg(&np->rxpmtu, skb);
	kfree_skb(skb);
}

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1
33.33%
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3
100.00%

/* For some errors we have valid addr_offset even with zero payload and
 * zero port. Also, addr_offset should be supported if port is set.
 */


static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
{
	return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
	       serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
	       serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
}

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/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
 *
 * At one point, excluding local errors was a quick test to identify icmp/icmp6
 * errors. This is no longer true, but the test remained, so the v6 stack,
 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
 */


static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
				      struct sock_exterr_skb *serr)
{
	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
	    serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
		return true;

	if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
		return false;

	if (!IP6CB(skb)->iif)
		return false;

	return true;
}

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/*
 *      Handle MSG_ERRQUEUE
 */


int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sock_exterr_skb *serr;
	struct sk_buff *skb;
	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
	struct {
		struct sock_extended_err ee;
		struct sockaddr_in6	 offender;
	} errhdr;
	int err;
	int copied;

	err = -EAGAIN;
	skb = sock_dequeue_err_skb(sk);
	if (!skb)
		goto out;

	copied = skb->len;
	if (copied > len) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
	if (unlikely(err)) {
		kfree_skb(skb);
		return err;
	}
	sock_recv_timestamp(msg, sk, skb);

	serr = SKB_EXT_ERR(skb);

	if (sin && ipv6_datagram_support_addr(serr)) {
		const unsigned char *nh = skb_network_header(skb);
		sin->sin6_family = AF_INET6;
		sin->sin6_flowinfo = 0;
		sin->sin6_port = serr->port;
		if (skb->protocol == htons(ETH_P_IPV6)) {
			const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
								  struct ipv6hdr, daddr);
			sin->sin6_addr = ip6h->daddr;
			if (np->sndflow)
				sin->sin6_flowinfo = ip6_flowinfo(ip6h);
			sin->sin6_scope_id =
				ipv6_iface_scope_id(&sin->sin6_addr,
						    IP6CB(skb)->iif);
		} else {
			ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
					       &sin->sin6_addr);
			sin->sin6_scope_id = 0;
		}
		*addr_len = sizeof(*sin);
	}

	memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
	sin = &errhdr.offender;
	memset(sin, 0, sizeof(*sin));

	if (ip6_datagram_support_cmsg(skb, serr)) {
		sin->sin6_family = AF_INET6;
		if (np->rxopt.all)
			ip6_datagram_recv_common_ctl(sk, msg, skb);
		if (skb->protocol == htons(ETH_P_IPV6)) {
			sin->sin6_addr = ipv6_hdr(skb)->saddr;
			if (np->rxopt.all)
				ip6_datagram_recv_specific_ctl(sk, msg, skb);
			sin->sin6_scope_id =
				ipv6_iface_scope_id(&sin->sin6_addr,
						    IP6CB(skb)->iif);
		} else {
			ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
					       &sin->sin6_addr);
			if (inet_sk(sk)->cmsg_flags)
				ip_cmsg_recv(msg, skb);
		}
	}

	put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);

	/* Now we could try to dump offended packet options */

	msg->msg_flags |= MSG_ERRQUEUE;
	err = copied;

	consume_skb(skb);
out:
	return err;
}
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Hideaki Yoshifuji / 吉藤英明
34
6.39%
3
10.00%
Arnaldo Carvalho de Melo
24
4.51%
4
13.33%
Willem de Bruijn
24
4.51%
4
13.33%
Brian Haley
24
4.51%
2
6.67%
Eric Dumazet
14
2.63%
1
3.33%
David S. Miller
13
2.44%
2
6.67%
Steffen Hurrle
11
2.07%
1
3.33%
Linus Torvalds
4
0.75%
1
3.33%
Julian Anastasov
3
0.56%
1
3.33%
Alexey Dobriyan
1
0.19%
1
3.33%
Al Viro
1
0.19%
1
3.33%
Ian Morris
1
0.19%
1
3.33%
Total
532
100.00%
30
100.00%


EXPORT_SYMBOL_GPL(ipv6_recv_error);

/*
 *      Handle IPV6_RECVPATHMTU
 */


int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
		     int *addr_len)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff *skb;
	struct ip6_mtuinfo mtu_info;
	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
	int err;
	int copied;

	err = -EAGAIN;
	skb = xchg(&np->rxpmtu, NULL);
	if (!skb)
		goto out;

	copied = skb->len;
	if (copied > len) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
	if (err)
		goto out_free_skb;

	sock_recv_timestamp(msg, sk, skb);

	memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));

	if (sin) {
		sin->sin6_family = AF_INET6;
		sin->sin6_flowinfo = 0;
		sin->sin6_port = 0;
		sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
		sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
		*addr_len = sizeof(*sin);
	}

	put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);

	err = copied;

out_free_skb:
	kfree_skb(skb);
out:
	return err;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Brian Haley
211
87.92%
1
16.67%
Hannes Frederic Sowa
13
5.42%
1
16.67%
Steffen Hurrle
13
5.42%
1
16.67%
David S. Miller
1
0.42%
1
16.67%
Ian Morris
1
0.42%
1
16.67%
Alexey Dobriyan
1
0.42%
1
16.67%
Total
240
100.00%
6
100.00%



void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
				 struct sk_buff *skb)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);

	if (np->rxopt.bits.rxinfo) {
		struct in6_pktinfo src_info;

		if (is_ipv6) {
			src_info.ipi6_ifindex = IP6CB(skb)->iif;
			src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
		} else {
			src_info.ipi6_ifindex =
				PKTINFO_SKB_CB(skb)->ipi_ifindex;
			ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
					       &src_info.ipi6_addr);
		}

		if (src_info.ipi6_ifindex >= 0)