Release 4.11 net/ipv6/udp.c

/*
 *      UDP over IPv6
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *
 *      Based on linux/ipv4/udp.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.
 *      Kazunori MIYAZAWA @USAGI:       change process style to use ip6_append_data
 *      YOSHIFUJI Hideaki @USAGI:       convert /proc/net/udp6 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/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include <net/addrconf.h>
#include <net/ndisc.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/raw.h>
#include <net/tcp_states.h>
#include <net/ip6_checksum.h>
#include <net/xfrm.h>
#include <net/inet6_hashtables.h>
#include <net/busy_poll.h>
#include <net/sock_reuseport.h>

#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <trace/events/skb.h>
#include "udp_impl.h"



static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
{
#if defined(CONFIG_NET_L3_MASTER_DEV)
	if (!net->ipv4.sysctl_udp_l3mdev_accept &&
	    skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
		return true;
#endif
	return false;
}

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static u32 udp6_ehashfn(const struct net *net,
			const struct in6_addr *laddr,
			const u16 lport,
			const struct in6_addr *faddr,
			const __be16 fport)
{
	static u32 udp6_ehash_secret __read_mostly;
	static u32 udp_ipv6_hash_secret __read_mostly;

	u32 lhash, fhash;

	net_get_random_once(&udp6_ehash_secret,
			    sizeof(udp6_ehash_secret));
	net_get_random_once(&udp_ipv6_hash_secret,
			    sizeof(udp_ipv6_hash_secret));

	lhash = (__force u32)laddr->s6_addr32[3];
	fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);

	return __inet6_ehashfn(lhash, lport, fhash, fport,
			       udp_ipv6_hash_secret + net_hash_mix(net));
}

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Vladislav Yasevich
1
0.91%
1
25.00%
Total
110
100.00%
4
100.00%



static u32 udp6_portaddr_hash(const struct net *net,
			      const struct in6_addr *addr6,
			      unsigned int port)
{
	unsigned int hash, mix = net_hash_mix(net);

	if (ipv6_addr_any(addr6))
		hash = jhash_1word(0, mix);
	else if (ipv6_addr_v4mapped(addr6))
		hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
	else
		hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);

	return hash ^ port;
}

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98
98.99%
3
75.00%
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1
1.01%
1
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99
100.00%
4
100.00%



int udp_v6_get_port(struct sock *sk, unsigned short snum)
{
	unsigned int hash2_nulladdr =
		udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
	unsigned int hash2_partial =
		udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);

	/* precompute partial secondary hash */
	udp_sk(sk)->udp_portaddr_hash = hash2_partial;
	return udp_lib_get_port(sk, snum, hash2_nulladdr);
}

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Eric Dumazet
47
67.14%
3
27.27%
Linus Torvalds (pre-git)
17
24.29%
4
36.36%
Arnaldo Carvalho de Melo
4
5.71%
2
18.18%
Pavel Emelyanov
1
1.43%
1
9.09%
Gerrit Renker
1
1.43%
1
9.09%
Total
70
100.00%
11
100.00%



static void udp_v6_rehash(struct sock *sk)
{
	u16 new_hash = udp6_portaddr_hash(sock_net(sk),
					  &sk->sk_v6_rcv_saddr,
					  inet_sk(sk)->inet_num);

	udp_lib_rehash(sk, new_hash);
}

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static int compute_score(struct sock *sk, struct net *net,
			 const struct in6_addr *saddr, __be16 sport,
			 const struct in6_addr *daddr, unsigned short hnum,
			 int dif, bool exact_dif)
{
	int score;
	struct inet_sock *inet;

	if (!net_eq(sock_net(sk), net) ||
	    udp_sk(sk)->udp_port_hash != hnum ||
	    sk->sk_family != PF_INET6)
		return -1;

	score = 0;
	inet = inet_sk(sk);

	if (inet->inet_dport) {
		if (inet->inet_dport != sport)
			return -1;
		score++;
	}

	if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
		if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
			return -1;
		score++;
	}

	if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
		if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
			return -1;
		score++;
	}

	if (sk->sk_bound_dev_if || exact_dif) {
		if (sk->sk_bound_dev_if != dif)
			return -1;
		score++;
	}

	if (sk->sk_incoming_cpu == raw_smp_processor_id())
		score++;

	return score;
}

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Linus Torvalds (pre-git)
109
49.32%
4
19.05%
Eric Dumazet
58
26.24%
6
28.57%
Joe Perches
19
8.60%
1
4.76%
Hideaki Yoshifuji / 吉藤英明
11
4.98%
3
14.29%
Pavel Emelyanov
8
3.62%
1
4.76%
Robert Shearman
5
2.26%
1
4.76%
Arnaldo Carvalho de Melo
3
1.36%
1
4.76%
Xuemin Su
3
1.36%
1
4.76%
Balazs Scheidler
2
0.90%
1
4.76%
David S. Miller
2
0.90%
1
4.76%
Gerrit Renker
1
0.45%
1
4.76%
Total
221
100.00%
21
100.00%

/* called with rcu_read_lock() */


static struct sock *udp6_lib_lookup2(struct net *net,
		const struct in6_addr *saddr, __be16 sport,
		const struct in6_addr *daddr, unsigned int hnum, int dif,
		bool exact_dif, struct udp_hslot *hslot2,
		struct sk_buff *skb)
{
	struct sock *sk, *result;
	int score, badness, matches = 0, reuseport = 0;
	u32 hash = 0;

	result = NULL;
	badness = -1;
	udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
		score = compute_score(sk, net, saddr, sport,
				      daddr, hnum, dif, exact_dif);
		if (score > badness) {
			reuseport = sk->sk_reuseport;
			if (reuseport) {
				hash = udp6_ehashfn(net, daddr, hnum,
						    saddr, sport);

				result = reuseport_select_sock(sk, hash, skb,
							sizeof(struct udphdr));
				if (result)
					return result;
				matches = 1;
			}
			result = sk;
			badness = score;
		} else if (score == badness && reuseport) {
			matches++;
			if (reciprocal_scale(hash, matches) == 0)
				result = sk;
			hash = next_pseudo_random32(hash);
		}
	}
	return result;
}

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Tom Herbert
73
32.88%
1
9.09%
Craig Gallek
26
11.71%
3
27.27%
Robert Shearman
5
2.25%
1
9.09%
Daniel Borkmann
4
1.80%
1
9.09%
Xuemin Su
1
0.45%
1
9.09%
Hannes Frederic Sowa
1
0.45%
1
9.09%
Total
222
100.00%
11
100.00%

/* rcu_read_lock() must be held */


struct sock *__udp6_lib_lookup(struct net *net,
				      const struct in6_addr *saddr, __be16 sport,
				      const struct in6_addr *daddr, __be16 dport,
				      int dif, struct udp_table *udptable,
				      struct sk_buff *skb)
{
	struct sock *sk, *result;
	unsigned short hnum = ntohs(dport);
	unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
	struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
	bool exact_dif = udp6_lib_exact_dif_match(net, skb);
	int score, badness, matches = 0, reuseport = 0;
	u32 hash = 0;

	if (hslot->count > 10) {
		hash2 = udp6_portaddr_hash(net, daddr, hnum);
		slot2 = hash2 & udptable->mask;
		hslot2 = &udptable->hash2[slot2];
		if (hslot->count < hslot2->count)
			goto begin;

		result = udp6_lib_lookup2(net, saddr, sport,
					  daddr, hnum, dif, exact_dif,
					  hslot2, skb);
		if (!result) {
			unsigned int old_slot2 = slot2;
			hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
			slot2 = hash2 & udptable->mask;
			/* avoid searching the same slot again. */
			if (unlikely(slot2 == old_slot2))
				return result;

			hslot2 = &udptable->hash2[slot2];
			if (hslot->count < hslot2->count)
				goto begin;

			result = udp6_lib_lookup2(net, saddr, sport,
						  daddr, hnum, dif,
						  exact_dif, hslot2,
						  skb);
		}
		return result;
	}
begin:
	result = NULL;
	badness = -1;
	sk_for_each_rcu(sk, &hslot->head) {
		score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
				      exact_dif);
		if (score > badness) {
			reuseport = sk->sk_reuseport;
			if (reuseport) {
				hash = udp6_ehashfn(net, daddr, hnum,
						    saddr, sport);
				result = reuseport_select_sock(sk, hash, skb,
							sizeof(struct udphdr));
				if (result)
					return result;
				matches = 1;
			}
			result = sk;
			badness = score;
		} else if (score == badness && reuseport) {
			matches++;
			if (reciprocal_scale(hash, matches) == 0)
				result = sk;
			hash = next_pseudo_random32(hash);
		}
	}
	return result;
}
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Tom Herbert
72
16.25%
1
5.88%
Craig Gallek
29
6.55%
3
17.65%
Xuemin Su
21
4.74%
1
5.88%
Linus Torvalds (pre-git)
18
4.06%
1
5.88%
Robert Shearman
16
3.61%
1
5.88%
Daniel Borkmann
4
0.90%
1
5.88%
Balazs Scheidler
2
0.45%
1
5.88%
Jorge Boncompte
1
0.23%
1
5.88%
Hannes Frederic Sowa
1
0.23%
1
5.88%
Total
443
100.00%
17
100.00%


EXPORT_SYMBOL_GPL(__udp6_lib_lookup);



static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
					  __be16 sport, __be16 dport,
					  struct udp_table *udptable)
{
	const struct ipv6hdr *iph = ipv6_hdr(skb);
	struct sock *sk;

	sk = skb_steal_sock(skb);
	if (unlikely(sk))
		return sk;
	return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
				 &iph->daddr, dport, inet6_iif(skb),
				 udptable, skb);
}

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KOVACS Krisztian
75
82.42%
2
28.57%
Ian Morris
6
6.59%
1
14.29%
Alexander Duyck
5
5.49%
1
14.29%
Eric Dumazet
3
3.30%
2
28.57%
Craig Gallek
2
2.20%
1
14.29%
Total
91
100.00%
7
100.00%



struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
				 __be16 sport, __be16 dport)
{
	const struct ipv6hdr *iph = ipv6_hdr(skb);

	return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
				 &iph->daddr, dport, inet6_iif(skb),
				 &udp_table, skb);
}
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62
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2
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64
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);

/* Must be called under rcu_read_lock().
 * Does increment socket refcount.
 */
#if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
    IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \
    IS_ENABLED(CONFIG_NF_SOCKET_IPV6)


struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
			     const struct in6_addr *daddr, __be16 dport, int dif)
{
	struct sock *sk;

	sk =  __udp6_lib_lookup(net, saddr, sport, daddr, dport,
				dif, &udp_table, NULL);
	if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
		sk = NULL;
	return sk;
}
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33.33%
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31
38.75%
1
33.33%
Craig Gallek
2
2.50%
1
33.33%
Total
80
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(udp6_lib_lookup);
#endif

/*
 *      This should be easy, if there is something there we
 *      return it, otherwise we block.
 */



int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
		  int noblock, int flags, int *addr_len)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct inet_sock *inet = inet_sk(sk);
	struct sk_buff *skb;
	unsigned int ulen, copied;
	int peeked, peeking, off;
	int err;
	int is_udplite = IS_UDPLITE(sk);
	bool checksum_valid = false;
	int is_udp4;

	if (flags & MSG_ERRQUEUE)
		return ipv6_recv_error(sk, msg, len, addr_len);

	if (np->rxpmtu && np->rxopt.bits.rxpmtu)
		return ipv6_recv_rxpmtu(sk, msg, len, addr_len);

try_again:
	peeking = off = sk_peek_offset(sk, flags);
	skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
	if (!skb)
		return err;

	ulen = skb->len;
	copied = len;
	if (copied > ulen - off)
		copied = ulen - off;
	else if (copied < ulen)
		msg->msg_flags |= MSG_TRUNC;

	is_udp4 = (skb->protocol == htons(ETH_P_IP));

	/*
         * If checksum is needed at all, try to do it while copying the
         * data.  If the data is truncated, or if we only want a partial
         * coverage checksum (UDP-Lite), do it before the copy.
         */

	if (copied < ulen || peeking ||
	    (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
		checksum_valid = !udp_lib_checksum_complete(skb);
		if (!checksum_valid)
			goto csum_copy_err;
	}

	if (checksum_valid || skb_csum_unnecessary(skb))
		err = skb_copy_datagram_msg(skb, off, msg, copied);
	else {
		err = skb_copy_and_csum_datagram_msg(skb, off, msg);
		if (err == -EINVAL)
			goto csum_copy_err;
	}
	if (unlikely(err)) {
		if (!peeked) {
			atomic_inc(&sk->sk_drops);
			if (is_udp4)
				UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
					      is_udplite);
			else
				UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
					       is_udplite);
		}
		kfree_skb(skb);
		return err;
	}
	if (!peeked) {
		if (is_udp4)
			UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
				      is_udplite);
		else
			UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
				       is_udplite);
	}

	sock_recv_ts_and_drops(msg, sk, skb);

	/* Copy the address. */
	if (msg->msg_name) {
		DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
		sin6->sin6_family = AF_INET6;
		sin6->sin6_port = udp_hdr(skb)->source;
		sin6->sin6_flowinfo = 0;

		if (is_udp4) {
			ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
					       &sin6->sin6_addr);
			sin6->sin6_scope_id = 0;
		} else {
			sin6->sin6_addr = ipv6_hdr(skb)->saddr;
			sin6->sin6_scope_id =
				ipv6_iface_scope_id(&sin6->sin6_addr,
						    inet6_iif(skb));
		}
		*addr_len = sizeof(*sin6);
	}

	if (np->rxopt.all)
		ip6_datagram_recv_common_ctl(sk, msg, skb);

	if (is_udp4) {
		if (inet->cmsg_flags)
			ip_cmsg_recv_offset(msg, sk, skb,
					    sizeof(struct udphdr), off);
	} else {
		if (np->rxopt.all)
			ip6_datagram_recv_specific_ctl(sk, msg, skb);
	}

	err = copied;
	if (flags & MSG_TRUNC)
		err = ulen;

	skb_consume_udp(sk, skb, peeking ? -err : err);
	return err;

csum_copy_err:
	if (!__sk_queue_drop_skb(sk, skb, flags, udp_skb_destructor)) {
		if (is_udp4) {
			UDP_INC_STATS(sock_net(sk),
				      UDP_MIB_CSUMERRORS, is_udplite);
			UDP_INC_STATS(sock_net(sk),
				      UDP_MIB_INERRORS, is_udplite);
		} else {
			UDP6_INC_STATS(sock_net(sk),
				       UDP_MIB_CSUMERRORS, is_udplite);
			UDP6_INC_STATS(sock_net(sk),
				       UDP_MIB_INERRORS, is_udplite);
		}
	}
	kfree_skb(skb);

	/* starting over for a new packet, but check if we need to yield */
	cond_resched();
	msg->msg_flags &= ~MSG_TRUNC;
	goto try_again;
}

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16.95%
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117
16.41%
9
15.25%
Wei Yongjun
54
7.57%
2
3.39%
Herbert Xu
49
6.87%
5
8.47%
Hideaki Yoshifuji / 吉藤英明
49
6.87%
2
3.39%
Hannes Frederic Sowa
46
6.45%
4
6.78%
samanthakumar
36
5.05%
1
1.69%
Brian Haley
30
4.21%
2
3.39%
David S. Miller
29
4.07%
4
6.78%
Pavel Emelyanov
15
2.10%
2
3.39%
Gerrit Renker
11
1.54%
1
1.69%
Paolo Abeni
9
1.26%
3
5.08%
Arnaldo Carvalho de Melo
9
1.26%
3
5.08%
Samuel Thibault
9
1.26%
1
1.69%
Xufeng Zhang
7
0.98%
1
1.69%
Wang Chen
6
0.84%
1
1.69%
Steffen Hurrle
6
0.84%
1
1.69%
Linus Torvalds
5
0.70%
1
1.69%
Stephen Hemminger
3
0.42%
1
1.69%
Hideo Aoki
3
0.42%
1
1.69%
Duan Jiong
1
0.14%
1
1.69%
Neil Horman
1
0.14%
1
1.69%
Alexey Dobriyan
1
0.14%
1
1.69%
Al Viro
1
0.14%
1
1.69%
Total
713
100.00%
59
100.00%



void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
		    u8 type, u8 code, int offset, __be32 info,
		    struct udp_table *udptable)
{
	struct ipv6_pinfo *np;
	const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
	const struct in6_addr *saddr = &hdr->saddr;
	const struct in6_addr *daddr = &hdr->daddr;
	struct udphdr *uh = (struct udphdr *)(skb->data+offset);
	struct sock *sk;
	int harderr;
	int err;
	struct net *net = dev_net(skb->dev);

	sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
			       inet6_iif(skb), udptable, skb);
	if (!sk) {
		__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
				  ICMP6_MIB_INERRORS);
		return;
	}

	harderr = icmpv6_err_convert(type, code, &err);
	np = inet6_sk(sk);

	if (type == ICMPV6_PKT_TOOBIG) {
		if (!ip6_sk_accept_pmtu(sk))
			goto out;
		ip6_sk_update_pmtu(skb, sk, info);
		if (np->pmtudisc != IPV6_PMTUDISC_DONT)
			harderr = 1;
	}
	if (type == NDISC_REDIRECT) {
		ip6_sk_redirect(skb, sk);
		goto out;
	}

	if (!np->recverr) {
		if (!harderr || sk->sk_state != TCP_ESTABLISHED)
			goto out;
	} else {
		ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
	}

	sk->sk_err = err;
	sk->sk_error_report(sk);
out:
	return;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
126
40.26%
7
25.00%
Wei Wang
42
13.42%
1
3.57%
David S. Miller
34
10.86%
3
10.71%
Linus Torvalds
33
10.54%
1
3.57%
Duan Jiong
31
9.90%
2
7.14%
Hannes Frederic Sowa
13
4.15%
1
3.57%
Eric Dumazet
8
2.56%
4
14.29%
Hideaki Yoshifuji / 吉藤英明
7
2.24%
2
7.14%
Gerrit Renker
6
1.92%
1
3.57%
Pavel Emelyanov
4
1.28%
1
3.57%
Arnaldo Carvalho de Melo
3
0.96%
1
3.57%
Brian Haley
2
0.64%
1
3.57%
Craig Gallek
2
0.64%
1
3.57%
Ian Morris
1
0.32%
1
3.57%
Al Viro
1
0.32%
1
3.57%
Total
313
100.00%
28
100.00%



int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	int rc;

	if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
		sock_rps_save_rxhash(sk, skb);
		sk_mark_napi_id(sk, skb);
		sk_incoming_cpu_update(sk);
	} else {
		sk_mark_napi_id_once(sk, skb);
	}

	rc = __udp_enqueue_schedule_skb(sk, skb);
	if (rc < 0) {
		int is_udplite = IS_UDPLITE(sk);

		/* Note that an ENOMEM error is charged twice */
		if (rc == -ENOMEM)
			UDP6_INC_STATS(sock_net(sk),
					 UDP_MIB_RCVBUFERRORS, is_udplite);
		UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
		kfree_skb(skb);
		return -1;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Benjamin LaHaise
101
78.29%
1
14.29%
Eric Dumazet
18
13.95%
4
57.14%
Shawn Bohrer
9
6.98%
1
14.29%
Paolo Abeni
1
0.78%
1
14.29%
Total
129
100.00%
7
100.00%



static __inline__ void udpv6_err(struct sk_buff *skb,
				 struct inet6_skb_parm *opt, u8 type,
				 u8 code, int offset, __be32 info)
{
	__udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gerrit Renker
40
85.11%
1
16.67%
Eric Dumazet
2
4.26%
1
16.67%
Brian Haley
2
4.26%
1
16.67%
Linus Torvalds (pre-git)
1
2.13%
1
16.67%
Al Viro
1
2.13%
1
16.67%
Hideaki Yoshifuji / 吉藤英明
1
2.13%
1
16.67%
Total
47
100.00%
6
100.00%


static struct static_key udpv6_encap_needed __read_mostly;


void udpv6_encap_enable(void)
{
	if (!static_key_enabled(&udpv6_encap_needed))
		static_key_slow_inc(&udpv6_encap_needed);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Benjamin LaHaise
22
100.00%
1
100.00%
Total
22
100.00%
1
100.00%


EXPORT_SYMBOL(udpv6_encap_enable);



int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	struct udp_sock *up = udp_sk(sk);
	int is_udplite = IS_UDPLITE(sk);

	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto drop;

	if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
		int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);

		/*
                 * This is an encapsulation socket so pass the skb to
                 * the socket's udp_encap_rcv() hook. Otherwise, just
                 * fall through and pass this up the UDP socket.
                 * up->encap_rcv() returns the following value:
                 * =0 if skb was successfully passed to the encap
                 *    handler or was discarded by it.
                 * >0 if skb should be passed on to UDP.
                 * <0 if skb should be resubmitted as proto -N
                 */

		/* if we're overly short, let UDP handle it */
		encap_rcv = ACCESS_ONCE(up->encap_rcv);
		if (encap_rcv) {
			int ret;

			/* Verify checksum before giving to encap */
			if (udp_lib_checksum_complete(skb))
				goto csum_error;

			ret = encap_rcv(sk, skb);
			if (ret <= 0) {
				__UDP_INC_STATS(sock_net(sk),
						UDP_MIB_INDATAGRAMS,
						is_udplite);
				return -ret;
			}
		}

		/* FALLTHROUGH -- it's a UDP Packet */
	}

	/*
         * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
         */
	if ((is_udplite & UDPLITE_RECV_CC)  &&  UDP_SKB_CB(skb)->partial_cov) {

		if (up->pcrlen == 0) {          /* full coverage was set  */
			net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
					    UDP_SKB_CB(skb)->cscov, skb->len);
			goto drop;
		}
		if (UDP_SKB_CB(skb)->cscov  <  up->pcrlen) {
			net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
					    UDP_SKB_CB(skb)->cscov, up->pcrlen);
			goto drop;
		}
	}

	if (rcu_access_pointer(sk->sk_filter) &&
	    udp_lib_checksum_complete(skb))
		goto csum_error;

	if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
		goto drop;

	udp_csum_pull_header(skb);

	skb_dst_drop(skb);

	return __udpv6_queue_rcv_skb(sk, skb);

csum_error:
	__UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
drop:
	__UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
	atomic_inc(&sk->sk_drops);
	kfree_skb(skb);
	return -1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Benjamin LaHaise
96
29.63%
3
12.00%
Gerrit Renker
91
28.09%
1
4.00%
Linus Torvalds (pre-git)
42
12.96%
4
16.00%
Eric Dumazet
26
8.02%
6
24.00%
Kazunori Miyazawa
12
3.70%
1
4.00%
Tom Herbert
11
3.40%
1
4.00%
samanthakumar
11
3.40%
1
4.00%
Michal Kubeček
10
3.09%
1
4.00%
Wang Chen
9
2.78%
1
4.00%
Pavel Emelyanov
5
1.54%
1
4.00%
Joe Perches
4
1.23%
1
4.00%
Herbert Xu
3
0.93%
1
4.00%
Daniel Borkmann
2
0.62%
1
4.00%
David S. Miller
1
0.31%
1
4.00%
Paolo Abeni
1
0.31%
1
4.00%
Total
324
100.00%
25
100.00%



static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
				   __be16 loc_port, const struct in6_addr *loc_addr,
				   __be16 rmt_port, const struct in6_addr *rmt_addr,
				   int dif, unsigned short hnum)
{
	struct inet_sock *inet = inet_sk(sk);

	if (!net_eq(sock_net(sk), net))
		return false;

	if (udp_sk(sk)->udp_port_hash != hnum ||
	    sk->sk_family != PF_INET6 ||
	    (inet->inet_dport && inet->inet_dport != rmt_port) ||
	    (!ipv6_addr_any(&sk->sk_v6_daddr) &&
		    !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
	    (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
	    (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
		    !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
		return false;
	if (!inet6_mc_check(sk, loc_addr, rmt_addr))
		return false;
	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
65
37.57%
4
19.05%
David Held
27
15.61%
1
4.76%
Henning Rogge
22
12.72%
1
4.76%
Eric Dumazet
20
11.56%
5
23.81%
David S. Miller
12
6.94%
2
9.52%
Sven Wegener
9
5.20%
1
4.76%
Hideaki Yoshifuji / 吉藤英明
6
3.47%
2
9.52%
Daniel Lezcano
4
2.31%
1
4.76%
Arnaldo Carvalho de Melo
4
2.31%
2
9.52%
David L Stevens
2
1.16%
1
4.76%
Al Viro
2
1.16%
1
4.76%
Total
173
100.00%
21
100.00%



static void udp6_csum_zero_error(struct sk_buff *skb)
{
	/* RFC 2460 section 8.1 says that we SHOULD log
         * this error. Well, it is reasonable.
         */
	net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
			    &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
			    &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Herbert
52
98.11%
1
50.00%
Joe Perches
1
1.89%
1
50.00%
Total
53
100.00%
2
100.00%

/*
 * Note: called only from the BH handler context,
 * so we don't need to lock the hashes.
 */


static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
		const struct in6_addr *saddr, const struct in6_addr *daddr,
		struct udp_table *udptable, int proto)
{
	struct sock *sk, *first = NULL;
	const struct udphdr *uh = udp_hdr(skb);
	unsigned short hnum = ntohs(uh->dest);
	struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
	unsigned int offset = offsetof(typeof(*sk), sk_node);
	unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
	int dif = inet6_iif(skb);
	struct hlist_node *node;
	struct sk_buff *nskb;

	if (use_hash2) {
		hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
			    udptable->mask;
		hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask;
start_lookup:
		hslot = &udptable->hash2[hash2];
		offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
	}

	sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
		if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
					    uh->source, saddr, dif, hnum))
			continue;
		/* If zero checksum and no_check is not on for
                 * the socket then skip it.
                 */
		if (!uh->check && !udp_sk(sk)->no_check6_rx)
			continue;
		if (!first) {
			first = sk;
			continue;
		}
		nskb = skb_clone(skb, GFP_ATOMIC);
		if (unlikely(!nskb)) {
			atomic_inc(&sk->sk_drops);
			__UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
					 IS_UDPLITE(sk));
			__UDP6_INC_STATS(net, UDP_MIB_INERRORS,
					 IS_UDPLITE(sk));
			continue;
		}

		if (udpv6_queue_rcv_skb(sk, nskb) > 0)
			consume_skb(nskb);
	}

	/* Also lookup *:port if we are using hash2 and haven't done so yet. */
	if (use_hash2 && hash2 != hash2_any) {
		hash2 = hash2_any;
		goto start_lookup;
	}

	if (first) {
		if (udpv6_queue_rcv_skb(first, skb) > 0)
			consume_skb(skb);
	} else {
		kfree_skb(skb);
		__UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
				 proto == IPPROTO_UDPLITE);
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Held
138
34.76%
2
8.70%
Eric Dumazet
138
34.76%
7
30.43%
Linus Torvalds (pre-git)
47
11.84%
3
13.04%
Gerrit Renker
16
4.03%
1
4.35%
Rick Jones
15
3.78%
1
4.35%
Hideo Aoki
13
3.27%
1
4.35%
Tom Herbert
10
2.52%
2
8.70%
Pavel Emelyanov
9
2.27%
3
13.04%
Pablo Neira Ayuso
6
1.51%
1
4.35%
Arnaldo Carvalho de Melo
3
0.76%
1
4.35%
Hideaki Yoshifuji / 吉藤英明
2
0.50%
1
4.35%
Total
397
100.00%
23
100.00%



int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
		   int proto)
{
	const struct in6_addr *saddr, *daddr;
	struct net *net = dev_net(skb->dev);
	struct udphdr *uh;
	struct sock *sk;
	u32 ulen = 0;

	if (!pskb_may_pull(skb, sizeof(struct udphdr)))
		goto discard;

	saddr = &ipv6_hdr(skb)->saddr;
	daddr = &ipv6_hdr(skb)->daddr;
	uh = udp_hdr(skb);

	ulen = ntohs(uh->len);
	if (ulen > skb->len)
		goto short_packet;

	if (proto == IPPROTO_UDP) {
		/* UDP validates ulen. */

		/* Check for jumbo payload */
		if (ulen == 0)
			ulen = skb->len;

		if (ulen < sizeof(*uh))
			goto short_packet;

		if (ulen < skb->len) {
			if (pskb_trim_rcsum(skb, ulen))
				goto short_packet;
			saddr = &ipv6_hdr(skb)->saddr;
			daddr = &ipv6_hdr(skb)->daddr;
			uh = udp_hdr(skb);
		}
	}

	if (udp6_csum_init(skb, uh, proto))
		goto csum_error;

	/*
         *      Multicast receive code
         */
	if (ipv6_addr_is_multicast(daddr))
		return __udp6_lib_mcast_deliver(net, skb,
				saddr, daddr, udptable, proto);

	/* Unicast */

	/*
         * check socket cache ... must talk to Alan about his plans
         * for sock caches... i'll skip this for now.
         */
	sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
	if (sk) {
		int ret;

		if (!uh->check && !udp_sk(sk)->no_check6_rx) {
			udp6_csum_zero_error(skb);
			goto csum_error;
		}

		if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
			skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
						 ip6_compute_pseudo);

		ret = udpv6_queue_rcv_skb(sk, skb);

		/* a return value > 0 means to resubmit the input */
		if (ret > 0)
			return ret;

		return 0;
	}

	if (!uh->check) {
		udp6_csum_zero_error(skb);
		goto csum_error;
	}

	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
		goto discard;

	if (udp_lib_checksum_complete(skb))
		goto csum_error;

	__UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);

	kfree_skb(skb);
	return 0;

short_packet:
	net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
			    proto == IPPROTO_UDPLITE ? "-Lite" : "",
			    saddr, ntohs(uh->source),
			    ulen, skb->len,
			    daddr, ntohs(uh->dest));
	goto discard;
csum_error:
	__UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
discard:
	__UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
	kfree_skb(skb);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
147
29.82%
4
11.76%
Linus Torvalds
74
15.01%
1
2.94%
Tom Herbert
72
14.60%
4
11.76%
Gerrit Renker
43
8.72%
1
2.94%
Eric Dumazet
33
6.69%
4
11.76%
Benjamin LaHaise
21
4.26%
1
2.94%
Björn Mork
20
4.06%
1
2.94%
Arnaldo Carvalho de Melo
18
3.65%
2
5.88%
Tom Lendacky
15
3.04%
1
2.94%
Alexey Dobriyan
12
2.43%
1
2.94%
Herbert Xu
10
2.03%
2
5.88%
David S. Miller
6
1.22%
1
2.94%
Pavel Emelyanov
6
1.22%
2
5.88%
Hideaki Yoshifuji / 吉藤英明
5
1.01%
3
8.82%
Eliezer Tamir
4
0.81%
1
2.94%
KOVACS Krisztian
2
0.41%
1
2.94%
Rick Jones
2
0.41%
1
2.94%
Joe Perches
1
0.20%
1
2.94%
Stephen Hemminger
1
0.20%
1
2.94%
Bill Sommerfeld
1
0.20%
1
2.94%
Total
493
100.00%
34
100.00%



static __inline__ int udpv6_rcv(struct sk_buff *skb)
{
	return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gerrit Renker
18
78.26%
1
25.00%
Herbert Xu
3
13.04%
2
50.00%
Eric Dumazet
2
8.70%
1
25.00%
Total
23
100.00%
4
100.00%

/*
 * Throw away all pending data and cancel the corking. Socket is locked.
 */


static void udp_v6_flush_pending_frames(struct sock *sk)
{
	struct udp_sock *up = udp_sk(sk);

	if (up->pending == AF_INET)
		udp_flush_pending_frames(sk);
	else if (up->pending) {
		up->len = 0;
		up->pending = 0;
		ip6_flush_pending_frames(sk);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kazunori Miyazawa
33
55.00%
1
20.00%
Denis V. Lunev
14
23.33%
1
20.00%
David S. Miller
6
10.00%
1
20.00%
Linus Torvalds (pre-git)
6
10.00%
1
20.00%
Arnaldo Carvalho de Melo
1
1.67%
1
20.00%
Total
60
100.00%
5
100.00%

/**
 *      udp6_hwcsum_outgoing  -  handle outgoing HW checksumming
 *      @sk:    socket we are sending on
 *      @skb:   sk_buff containing the filled-in UDP header
 *              (checksum field must be zeroed out)
 */


static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
				 const struct in6_addr *saddr,
				 const struct in6_addr *daddr, int len)
{
	unsigned int offset;
	struct udphdr *uh = udp_hdr(skb);
	struct sk_buff *frags = skb_shinfo(skb)->frag_list;
	__wsum csum = 0;

	if (!frags) {
		/* Only one fragment on the socket.  */
		skb->csum_start = skb_transport_header(skb) - skb->head;
		skb->csum_offset = offsetof(struct udphdr, check);
		uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
	} else {
		/*
                 * HW-checksum won't work as there are two or more
                 * fragments on the socket so that all csums of sk_buffs
                 * should be together
                 */
		offset = skb_transport_offset(skb);
		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);

		skb->ip_summed = CHECKSUM_NONE;

		do {
			csum = csum_add(csum, frags->csum);
		} while ((frags = frags->next));

		uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
					    csum);
		if (uh->check == 0)
			uh->check = CSUM_MANGLED_0;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sridhar Samudrala
178
86.83%
1
50.00%
Vlad Yasevich
27
13.17%
1
50.00%
Total
205
100.00%
2
100.00%

/*
 *      Sending
 */



static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
{
	struct sock *sk = skb->sk;
	struct udphdr *uh;
	int err = 0;
	int is_udplite = IS_UDPLITE(sk);
	__wsum csum = 0;
	int offset = skb_transport_offset(skb);
	int len = skb->len - offset;

	/*
         * Create a UDP header
         */
	uh = udp_hdr(skb);
	uh->source = fl6->fl6_sport;
	uh->dest = fl6->fl6_dport;
	uh->len = htons(len);
	uh->check = 0;

	if (is_udplite)
		csum = udplite_csum(skb);
	else if (udp_sk(sk)->no_check6_tx) {   /* UDP csum disabled */
		skb->ip_summed = CHECKSUM_NONE;
		goto send;
	} else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
		udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
		goto send;
	} else
		csum = udp_csum(skb);

	/* add protocol-dependent pseudo-header */
	uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
				    len, fl6->flowi6_proto, csum);
	if (uh->check == 0)
		uh->check = CSUM_MANGLED_0;

send:
	err = ip6_send_skb(skb);
	if (err) {
		if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
			UDP6_INC_STATS(sock_net(sk),
				       UDP_MIB_SNDBUFERRORS, is_udplite);
			err = 0;
		}
	} else {
		UDP6_INC_STATS(sock_net(sk),
			       UDP_MIB_OUTDATAGRAMS, is_udplite);
	}
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kazunori Miyazawa
56
19.65%
1
4.55%
Eric Dumazet
38
13.33%
2
9.09%
Gerrit Renker
37
12.98%
2
9.09%
Vlad Yasevich
36
12.63%
1
4.55%
Sridhar Samudrala
32
11.23%
1
4.55%
Linus Torvalds (pre-git)
25
8.77%
2
9.09%
Tom Herbert
18
6.32%
2
9.09%
David S. Miller
16
5.61%
3
13.64%
Wang Chen
10
3.51%
1
4.55%
Hideaki Yoshifuji / 吉藤英明
5
1.75%
1
4.55%
Pavel Emelyanov
5
1.75%
1
4.55%
Arnaldo Carvalho de Melo
3
1.05%
1
4.55%
Al Viro
2
0.70%
2
9.09%
Hannes Frederic Sowa
1
0.35%
1
4.55%
Ian Morris
1
0.35%
1
4.55%
Total
285
100.00%
22
100.00%



static int udp_v6_push_pending_frames(struct sock *sk)
{
	struct sk_buff *skb;
	struct udp_sock  *up = udp_sk(sk);
	struct flowi6 fl6;
	int err = 0;

	if (up->pending == AF_INET)
		return udp_push_pending_frames(sk);

	/* ip6_finish_skb will release the cork, so make a copy of
         * fl6 here.
         */
	fl6 = inet_sk(sk)->cork.fl.u.ip6;

	skb = ip6_finish_skb(sk);
	if (!skb)
		goto out;

	err = udp_v6_send_skb(skb, &fl6);

out:
	up->len = 0;
	up->pending = 0;
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
89
83.18%
1
20.00%
Eric Dumazet
14
13.08%
1
20.00%
Kazunori Miyazawa
2
1.87%
1
20.00%
Linus Torvalds (pre-git)
2
1.87%
2
40.00%
Total
107
100.00%
5
100.00%



int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
{
	struct ipv6_txoptions opt_space;
	struct udp_sock *up = udp_sk(sk);
	struct inet_sock *inet = inet_sk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
	struct in6_addr *daddr, *final_p, final;
	struct ipv6_txoptions *opt = NULL;
	struct ipv6_txoptions *opt_to_free = NULL;
	struct ip6_flowlabel *flowlabel = NULL;
	struct flowi6 fl6;
	struct dst_entry *dst;
	struct ipcm6_cookie ipc6;
	int addr_len = msg->msg_namelen;
	int ulen = len;
	int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
	int err;
	int connected = 0;
	int is_udplite = IS_UDPLITE(sk);
	int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
	struct sockcm_cookie sockc;

	ipc6.hlimit = -1;
	ipc6.tclass = -1;
	ipc6.dontfrag = -1;
	sockc.tsflags = sk->sk_tsflags;

	/* destination address check */
	if (sin6) {
		if (addr_len < offsetof(struct sockaddr, sa_data))
			return -EINVAL;

		switch (sin6->sin6_family) {
		case AF_INET6:
			if (addr_len < SIN6_LEN_RFC2133)
				return -EINVAL;
			daddr = &sin6->sin6_addr;
			if (ipv6_addr_any(daddr) &&
			    ipv6_addr_v4mapped(&np->saddr))
				ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
						       daddr);
			break;
		case AF_INET:
			goto do_udp_sendmsg;
		case AF_UNSPEC:
			msg->msg_name = sin6 = NULL;
			msg->msg_namelen = addr_len = 0;
			daddr = NULL;
			break;
		default:
			return -EINVAL;
		}
	} else if (!up->pending) {
		if (sk->sk_state != TCP_ESTABLISHED)
			return -EDESTADDRREQ;
		daddr = &sk->sk_v6_daddr;
	} else
		daddr = NULL;

	if (daddr) {
		if (ipv6_addr_v4mapped(daddr)) {
			struct sockaddr_in sin;
			sin.sin_family = AF_INET;
			sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
			sin.sin_addr.s_addr = daddr->s6_addr32[3];
			msg->msg_name = &sin;
			msg->msg_namelen = sizeof(sin);
do_udp_sendmsg:
			if (__ipv6_only_sock(sk))
				return -ENETUNREACH;
			return udp_sendmsg(sk, msg, len);
		}
	}

	if (up->pending == AF_INET)
		return udp_sendmsg(sk, msg, len);

	/* Rough check on arithmetic overflow,
           better check is made in ip6_append_data().
           */
	if (len > INT_MAX - sizeof(struct udphdr))
		return -EMSGSIZE;

	getfrag  =  is_udplite ?  udplite_getfrag : ip_generic_getfrag;
	if (up->pending) {
		/*
                 * There are pending frames.
                 * The socket lock must be held while it's corked.
                 */
		lock_sock(sk);
		if (likely(up->pending)) {
			if (unlikely(up->pending != AF_INET6)) {
				release_sock(sk);
				return -EAFNOSUPPORT;
			}
			dst = NULL;
			goto do_append_data;
		}
		release_sock(sk);
	}
	ulen += sizeof(struct udphdr);

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

	if (sin6) {
		if (sin6->sin6_port == 0)
			return -EINVAL;

		fl6.fl6_dport = sin6->sin6_port;
		daddr = &sin6->sin6_addr;

		if (np->sndflow) {
			fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
			if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
				flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
				if (!flowlabel)
					return -EINVAL;
			}
		}

		/*
                 * Otherwise it will be difficult to maintain
                 * sk->sk_dst_cache.
                 */
		if (sk->sk_state == TCP_ESTABLISHED &&
		    ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
			daddr = &sk->sk_v6_daddr;

		if (addr_len >= sizeof(struct sockaddr_in6) &&
		    sin6->sin6_scope_id &&
		    __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
			fl6.flowi6_oif = sin6->sin6_scope_id;
	} else {
		if (sk->sk_state != TCP_ESTABLISHED)
			return -EDESTADDRREQ;

		fl6.fl6_dport = inet->inet_dport;
		daddr = &sk->sk_v6_daddr;
		fl6.flowlabel = np->flow_label;
		connected = 1;
	}

	if (!fl6.flowi6_oif)
		fl6.flowi6_oif = sk->sk_bound_dev_if;

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

	fl6.flowi6_mark = sk->sk_mark;
	fl6.flowi6_uid = sk->sk_uid;

	if (msg->msg_controllen) {
		opt = &opt_space;
		memset(opt, 0, sizeof(struct ipv6_txoptions));
		opt->tot_len = sizeof(*opt);
		ipc6.opt = opt;

		err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
		if (err < 0) {
			fl6_sock_release(flowlabel);
			return err;
		}
		if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
			if (!flowlabel)
				return -EINVAL;
		}
		if (!(opt->opt_nflen|opt->opt_flen))
			opt = NULL;
		connected = 0;
	}
	if (!opt) {
		opt = txopt_get(np);
		opt_to_free = opt;
	}
	if (flowlabel)
		opt = fl6_merge_options(&opt_space, flowlabel, opt);
	opt = ipv6_fixup_options(&opt_space, opt);
	ipc6.opt = opt;

	fl6.flowi6_proto = sk->sk_protocol;
	if (!ipv6_addr_any(daddr))
		fl6.daddr = *daddr;
	else
		fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
	if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
		fl6.saddr = np->saddr;
	fl6.fl6_sport = inet->inet_sport;

	final_p = fl6_update_dst(&fl6, opt, &final);
	if (final_p)
		connected = 0;

	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
		fl6.flowi6_oif = np->mcast_oif;
		connected = 0;
	} else if (!fl6.flowi6_oif)
		fl6.flowi6_oif = np->ucast_oif;

	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));

	if (ipc6.tclass < 0)
		ipc6.tclass = np->tclass;

	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);

	dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
		dst = NULL;
		goto out;
	}

	if (ipc6.hlimit < 0)
		ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);

	if (msg->msg_flags&MSG_CONFIRM)
		goto do_confirm;
back_from_confirm:

	/* Lockless fast path for the non-corking case */
	if (!corkreq) {
		struct sk_buff *skb;

		skb = ip6_make_skb(sk, getfrag, msg, ulen,
				   sizeof(struct udphdr), &ipc6,
				   &fl6, (struct rt6_info *)dst,
				   msg->msg_flags, &sockc);
		err = PTR_ERR(skb);
		if (!IS_ERR_OR_NULL(skb))
			err = udp_v6_send_skb(skb, &fl6);
		goto release_dst;
	}

	lock_sock(sk);
	if (unlikely(up->pending)) {
		/* The socket is already corked while preparing it. */
		/* ... which is an evident application bug. --ANK */
		release_sock(sk);

		net_dbg_ratelimited("udp cork app bug 2\n");
		err = -EINVAL;
		goto out;
	}

	up->pending = AF_INET6;

do_append_data:
	if (ipc6.dontfrag < 0)
		ipc6.dontfrag = np->dontfrag;
	up->len += ulen;
	err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
			      &ipc6, &fl6, (struct rt6_info *)dst,
			      corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
	if (err)
		udp_v6_flush_pending_frames(sk);
	else if (!corkreq)
		err = udp_v6_push_pending_frames(sk);
	else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
		up->pending = 0;

	if (err > 0)
		err = np->recverr ? net_xmit_errno(err) : 0;
	release_sock(sk);

release_dst:
	if (dst) {
		if (connected) {
			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);
		} else {
			dst_release(dst);
		}
		dst = NULL;
	}

out:
	dst_release(dst);
	fl6_sock_release(flowlabel);
	txopt_put(opt_to_free);
	if (!err)
		return len;
	/*
         * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space.  Reporting
         * ENOBUFS might not be good (it's not tunable per se), but otherwise
         * we don't have a good statistic (IpOutDiscards but it can be too many
         * things).  We could add another new stat but at least for now that
         * seems like overkill.
         */
	if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
		UDP6_INC_STATS(sock_net(sk),
			       UDP_MIB_SNDBUFERRORS, is_udplite);
	}
	return err;

do_confirm:
	if (msg->msg_flags & MSG_PROBE)
		dst_confirm_neigh(dst, &fl6.daddr);
	if (!(msg->msg_flags&MSG_PROBE) || len)
		goto back_from_confirm;
	err = 0;
	goto out;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kazunori Miyazawa
408
24.42%
2
2.56%
Hideaki Yoshifuji / 吉藤英明
303
18.13%
9
11.54%
Linus Torvalds (pre-git)
252
15.08%
10
12.82%
David S. Miller
165
9.87%
11
14.10%
Vlad Yasevich
110
6.58%
1
1.28%
Wei Wang
50
2.99%
1
1.28%
Herbert Xu
45
2.69%
2
2.56%
Eric Dumazet
36
2.15%
4
5.13%
Hannes Frederic Sowa
35
2.09%
2
2.56%
Gerrit Renker
33
1.97%
1
1.28%
Brian Haley
28
1.68%
4
5.13%
Jonathan T. Leighton
25
1.50%
1
1.28%
Mitsuru Kanda
24
1.44%
1
1.28%
Erich E. Hoover
16
0.96%
1
1.28%
Julian Anastasov
14
0.84%
1
1.28%
Lorenzo Colitti
14
0.84%
2
2.56%
Yang Hongyang
13
0.78%
1
1.28%
Jiri Pirko
12
0.72%
1
1.28%
Soheil Hassas Yeganeh
11
0.66%
2
2.56%
Arnaud Ebalard
10
0.60%
1
1.28%
Noriaki Takamiya
10
0.60%
1
1.28%
Alexey Dobriyan
8
0.48%
2
2.56%
Alexander Potapenko
8
0.48%
1
1.28%
Steffen Hurrle
7
0.42%
1
1.28%
Arnaldo Carvalho de Melo
6
0.36%
3
3.85%
Venkat Yekkirala
6
0.36%
1
1.28%
Pavel Emelyanov
5
0.30%
1
1.28%
Wang Chen
4
0.24%
1
1.28%
Ian Morris
3
0.18%
1
1.28%
Andi Kleen
2
0.12%
1
1.28%
Maciej Żenczykowski
2
0.12%
1
1.28%
Suresh Krishnan
1
0.06%
1
1.28%
Joe Perches
1
0.06%
1
1.28%
Stephen Hemminger
1
0.06%
1
1.28%
Thomas Graf
1
0.06%
1
1.28%
Tom Parkin
1
0.06%
1
1.28%
Ville Nuorvala
1
0.06%
1
1.28%
Total
1671
100.00%
78
100.00%



void udpv6_destroy_sock(struct sock *sk)
{
	struct udp_sock *up = udp_sk(sk);
	lock_sock(sk);
	udp_v6_flush_pending_frames(sk);
	release_sock(sk);

	if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
		void (*encap_destroy)(struct sock *sk);
		encap_destroy = ACCESS_ONCE(up->encap_destroy);
		if (encap_destroy)
			encap_destroy(sk);
	}

	inet6_destroy_sock(sk);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Parkin
54
64.29%
1
33.33%
Kazunori Miyazawa
29
34.52%
1
33.33%
Brian Haley
1
1.19%
1
33.33%
Total
84
100.00%
3
100.00%

/*
 *      Socket option code for UDP
 */


int udpv6_setsockopt(struct sock *sk, int level, int optname,
		     char __user *optval, unsigned int optlen)
{
	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
					  udp_v6_push_pending_frames);
	return ipv6_setsockopt(sk, level, optname, optval, optlen);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Mishin
29
44.62%
1
14.29%
Kazunori Miyazawa
24
36.92%
1
14.29%
David S. Miller
7
10.77%
2
28.57%
Gerrit Renker
4
6.15%
2
28.57%
Al Viro
1
1.54%
1
14.29%
Total
65
100.00%
7
100.00%

#ifdef CONFIG_COMPAT


int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
			    char __user *optval, unsigned int optlen)
{
	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
					  udp_v6_push_pending_frames);
	return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Mishin
36
55.38%
1
12.50%
Kazunori Miyazawa
14
21.54%
1
12.50%
David S. Miller
7
10.77%
2
25.00%
Gerrit Renker
4
6.15%
2
25.00%
Linus Torvalds (pre-git)
4
6.15%
2
25.00%
Total
65
100.00%
8
100.00%

#endif



int udpv6_getsockopt(struct sock *sk, int level, int optname,
		     char __user *optval, int __user *optlen)
{
	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
	return ipv6_getsockopt(sk, level, optname, optval, optlen);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Mishin
56
87.50%
1
25.00%
David S. Miller
6
9.38%
1
25.00%
Gerrit Renker
2
3.12%
2
50.00%
Total
64
100.00%
4
100.00%

#ifdef CONFIG_COMPAT


int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
			    char __user *optval, int __user *optlen)
{
	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
	return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dmitry Mishin
56
87.50%
1
25.00%
David S. Miller
6
9.38%
1
25.00%
Gerrit Renker
2
3.12%
2
50.00%
Total
64
100.00%
4
100.00%

#endif


static const struct inet6_protocol udpv6_protocol = {
	.handler	=	udpv6_rcv,
	.err_handler	=	udpv6_err,
	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};

/* ------------------------------------------------------------------------ */
#ifdef CONFIG_PROC_FS


int udp6_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN) {
		seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
	} else {
		int bucket = ((struct udp_iter_state *)seq->private)->bucket;
		struct inet_sock *inet = inet_sk(v);
		__u16 srcp = ntohs(inet->inet_sport);
		__u16 destp = ntohs(inet->inet_dport);
		ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lorenzo Colitti
49
52.13%
1
16.67%
Linus Torvalds (pre-git)
27
28.72%
2
33.33%
David S. Miller
11
11.70%
2
33.33%
Hideaki Yoshifuji / 吉藤英明
7
7.45%
1
16.67%
Total
94
100.00%
6
100.00%


static const struct file_operations udp6_afinfo_seq_fops = {
	.owner    = THIS_MODULE,
	.open     = udp_seq_open,
	.read     = seq_read,
	.llseek   = seq_lseek,
	.release  = seq_release_net
};


static struct udp_seq_afinfo udp6_seq_afinfo = {
	.name		= "udp6",
	.family		= AF_INET6,
	.udp_table	= &udp_table,
	.seq_fops	= &udp6_afinfo_seq_fops,
	.seq_ops	= {
		.show		= udp6_seq_show,
        },
};



int __net_init udp6_proc_init(struct net *net)
{
	return udp_proc_register(net, &udp6_seq_afinfo);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
10
50.00%
1
20.00%
Daniel Lezcano
6
30.00%
1
20.00%
Linus Torvalds (pre-git)
3
15.00%
2
40.00%
Alexey Dobriyan
1
5.00%
1
20.00%
Total
20
100.00%
5
100.00%



void udp6_proc_exit(struct net *net)
{
	udp_proc_unregister(net, &udp6_seq_afinfo);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
7
38.89%
1
25.00%
Daniel Lezcano
6
33.33%
1
25.00%
Linus Torvalds (pre-git)
5
27.78%
2
50.00%
Total
18
100.00%
4
100.00%

#endif /* CONFIG_PROC_FS */

/* ------------------------------------------------------------------------ */


struct proto udpv6_prot = {
	.name		   = "UDPv6",
	.owner		   = THIS_MODULE,
	.close		   = udp_lib_close,
	.connect	   = ip6_datagram_connect,
	.disconnect	   = udp_disconnect,
	.ioctl		   = udp_ioctl,
	.init		   = udp_init_sock,
	.destroy	   = udpv6_destroy_sock,
	.setsockopt	   = udpv6_setsockopt,
	.getsockopt	   = udpv6_getsockopt,
	.sendmsg	   = udpv6_sendmsg,
	.recvmsg	   = udpv6_recvmsg,
	.release_cb	   = ip6_datagram_release_cb,
	.hash		   = udp_lib_hash,
	.unhash		   = udp_lib_unhash,
	.rehash		   = udp_v6_rehash,
	.get_port	   = udp_v6_get_port,
	.memory_allocated  = &udp_memory_allocated,
	.sysctl_mem	   = sysctl_udp_mem,
	.sysctl_wmem	   = &sysctl_udp_wmem_min,
	.sysctl_rmem	   = &sysctl_udp_rmem_min,
	.obj_size	   = sizeof(struct udp6_sock),
	.h.udp_table	   = &udp_table,
#ifdef CONFIG_COMPAT
	.compat_setsockopt = compat_udpv6_setsockopt,
	.compat_getsockopt = compat_udpv6_getsockopt,
#endif
	.diag_destroy      = udp_abort,
};


static struct inet_protosw udpv6_protosw = {
	.type =      SOCK_DGRAM,
	.protocol =  IPPROTO_UDP,
	.prot =      &udpv6_prot,
	.ops =       &inet6_dgram_ops,
	.flags =     INET_PROTOSW_PERMANENT,
};



int __init udpv6_init(void)
{
	int ret;

	ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
	if (ret)
		goto out;

	ret = inet6_register_protosw(&udpv6_protosw);
	if (ret)
		goto out_udpv6_protocol;
out:
	return ret;

out_udpv6_protocol:
	inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
	goto out;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Lezcano
43
70.49%
1
20.00%
Linus Torvalds (pre-git)
12
19.67%
2
40.00%
David S. Miller
5
8.20%
1
20.00%
Vlad Yasevich
1
1.64%
1
20.00%
Total
61
100.00%
5
100.00%



void udpv6_exit(void)
{
	inet6_unregister_protosw(&udpv6_protosw);
	inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Lezcano
15
71.43%
1
33.33%
Linus Torvalds
5
23.81%
1
33.33%
Linus Torvalds (pre-git)
1
4.76%
1
33.33%
Total
21
100.00%
3
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
1223
16.28%
29
10.00%
Eric Dumazet
1153
15.35%
38
13.10%
Kazunori Miyazawa
587
7.81%
3
1.03%
Hideaki Yoshifuji / 吉藤英明
452
6.02%
23
7.93%
Tom Herbert
378
5.03%
7
2.41%
Gerrit Renker
318
4.23%
3
1.03%
David S. Miller
316
4.21%
21
7.24%
Vlad Yasevich
263
3.50%
3
1.03%
Benjamin LaHaise
251
3.34%
3
1.03%
Sridhar Samudrala
210
2.80%
1
0.34%
Hannes Frederic Sowa
204
2.72%
9
3.10%
Dmitry Mishin
187
2.49%
1
0.34%
David Held
165
2.20%
2
0.69%
Linus Torvalds
142
1.89%
3
1.03%
Herbert Xu
116
1.54%
10
3.45%
Wei Wang
92
1.22%
2
0.69%
Arnaldo Carvalho de Melo
89
1.18%
14
4.83%
Robert Shearman
77
1.03%
1
0.34%
KOVACS Krisztian
77
1.03%
2
0.69%
Daniel Lezcano
74
0.99%
3
1.03%
Pavel Emelyanov
68
0.91%
9
3.10%
Craig Gallek
67
0.89%
4
1.38%
Brian Haley
64
0.85%
9
3.10%
Lorenzo Colitti
63
0.84%
3
1.03%
Balazs Scheidler
56
0.75%
2
0.69%
Tom Parkin
55
0.73%
2
0.69%
Wei Yongjun
54
0.72%
2
0.69%
samanthakumar
47
0.63%
2
0.69%
Rusty Russell
40
0.53%
1
0.34%
Hideo Aoki
39
0.52%
1
0.34%
Arjan van de Ven
35
0.47%
1
0.34%
Duan Jiong
32
0.43%
3
1.03%
Wang Chen
29
0.39%
2
0.69%
Xuemin Su
26
0.35%
1
0.34%
Joe Perches
26
0.35%
2
0.69%
Denis V. Lunev
26
0.35%
3
1.03%
Jonathan T. Leighton
25
0.33%
1
0.34%
Mitsuru Kanda
24
0.32%
1
0.34%
Alexey Dobriyan
23
0.31%
5
1.72%
Henning Rogge
22
0.29%
1
0.34%
Björn Mork
20
0.27%
1
0.34%
Tom Lendacky
18
0.24%
2
0.69%
Rick Jones
17
0.23%
1
0.34%
Paolo Abeni
16
0.21%
3
1.03%
Erich E. Hoover
16
0.21%
1
0.34%
Julian Anastasov
14
0.19%
1
0.34%
Steffen Hurrle
13
0.17%
1
0.34%
Ian Morris
13
0.17%
3
1.03%
Yang Hongyang
13
0.17%
1
0.34%
Jiri Pirko
12
0.16%
1
0.34%
Soheil Hassas Yeganeh
11
0.15%
2
0.69%
Michal Kubeček
10
0.13%
1
0.34%
Daniel Borkmann
10
0.13%
2
0.69%
Arnaud Ebalard
10
0.13%
1
0.34%
Noriaki Takamiya
10
0.13%
1
0.34%
Samuel Thibault
9
0.12%
1
0.34%
Shawn Bohrer
9
0.12%
1
0.34%
Sven Wegener
9
0.12%
1
0.34%
Alexander Potapenko
8
0.11%
1
0.34%
Al Viro
8
0.11%
7
2.41%
Alexander Duyck
7
0.09%
1
0.34%
Xufeng Zhang
7
0.09%
1
0.34%
Eliezer Tamir
7
0.09%
2
0.69%
Arnd Bergmann
6
0.08%
1
0.34%
Pablo Neira Ayuso
6
0.08%
1
0.34%
Venkat Yekkirala
6
0.08%
1
0.34%
Stephen Hemminger
5
0.07%
2
0.69%
Martin KaFai Lau
5
0.07%
1
0.34%
David Ahern
3
0.04%
1
0.34%
Tejun Heo
3
0.04%
1
0.34%
Octavian Purdila
2
0.03%
1
0.34%
David L Stevens
2
0.03%
1
0.34%
Maciej Żenczykowski
2
0.03%
1
0.34%
Andi Kleen
2
0.03%
1
0.34%
Ville Nuorvala
1
0.01%
1
0.34%
Vladislav Yasevich
1
0.01%
1
0.34%
Jorge Boncompte
1
0.01%
1
0.34%
Adrian Bunk
1
0.01%
1
0.34%
Bill Sommerfeld
1
0.01%
1
0.34%
Thomas Graf
1
0.01%
1
0.34%
Neil Horman
1
0.01%
1
0.34%
Suresh Krishnan
1
0.01%
1
0.34%
Total
7512
100.00%
290
100.00%
Directory: net/ipv6

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