![YOSHIFUJI Hideaki](/assets/img/avatar_default.png)
Based on ancient patch by Mickael Hoerdt <hoerdt@clarinet.u-strasbg.fr>, which is available at <http://www-r2.u-strasbg.fr/~hoerdt/dev/linux_ipv6_mforwarding/patch-linux-ipv6-mforwarding-0.1a>. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
1131 lines
26 KiB
C
1131 lines
26 KiB
C
/*
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* PF_INET6 socket protocol family
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* Adapted from linux/net/ipv4/af_inet.c
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*
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* $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
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*
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* Fixes:
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* piggy, Karl Knutson : Socket protocol table
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* Hideaki YOSHIFUJI : sin6_scope_id support
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* Arnaldo Melo : check proc_net_create return, cleanups
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/init.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/icmpv6.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/udp.h>
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#include <net/udplite.h>
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#include <net/tcp.h>
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#include <net/ipip.h>
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#include <net/protocol.h>
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#include <net/inet_common.h>
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#include <net/transp_v6.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#ifdef CONFIG_IPV6_TUNNEL
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#include <net/ip6_tunnel.h>
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#endif
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#ifdef CONFIG_IPV6_MROUTE
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#include <linux/mroute6.h>
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#endif
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MODULE_AUTHOR("Cast of dozens");
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MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
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MODULE_LICENSE("GPL");
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/* The inetsw6 table contains everything that inet6_create needs to
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* build a new socket.
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*/
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static struct list_head inetsw6[SOCK_MAX];
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static DEFINE_SPINLOCK(inetsw6_lock);
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static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
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{
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const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
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return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
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}
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static int inet6_create(struct net *net, struct socket *sock, int protocol)
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{
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struct inet_sock *inet;
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struct ipv6_pinfo *np;
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struct sock *sk;
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struct list_head *p;
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struct inet_protosw *answer;
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struct proto *answer_prot;
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unsigned char answer_flags;
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char answer_no_check;
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int try_loading_module = 0;
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int err;
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if (sock->type != SOCK_RAW &&
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sock->type != SOCK_DGRAM &&
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!inet_ehash_secret)
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build_ehash_secret();
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/* Look for the requested type/protocol pair. */
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answer = NULL;
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lookup_protocol:
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err = -ESOCKTNOSUPPORT;
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rcu_read_lock();
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list_for_each_rcu(p, &inetsw6[sock->type]) {
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answer = list_entry(p, struct inet_protosw, list);
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/* Check the non-wild match. */
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if (protocol == answer->protocol) {
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if (protocol != IPPROTO_IP)
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break;
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} else {
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/* Check for the two wild cases. */
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if (IPPROTO_IP == protocol) {
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protocol = answer->protocol;
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break;
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}
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if (IPPROTO_IP == answer->protocol)
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break;
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}
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err = -EPROTONOSUPPORT;
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answer = NULL;
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}
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if (!answer) {
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if (try_loading_module < 2) {
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rcu_read_unlock();
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/*
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* Be more specific, e.g. net-pf-10-proto-132-type-1
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* (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
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*/
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if (++try_loading_module == 1)
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request_module("net-pf-%d-proto-%d-type-%d",
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PF_INET6, protocol, sock->type);
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/*
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* Fall back to generic, e.g. net-pf-10-proto-132
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* (net-pf-PF_INET6-proto-IPPROTO_SCTP)
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*/
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else
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request_module("net-pf-%d-proto-%d",
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PF_INET6, protocol);
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goto lookup_protocol;
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} else
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goto out_rcu_unlock;
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}
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err = -EPERM;
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if (answer->capability > 0 && !capable(answer->capability))
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goto out_rcu_unlock;
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sock->ops = answer->ops;
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answer_prot = answer->prot;
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answer_no_check = answer->no_check;
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answer_flags = answer->flags;
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rcu_read_unlock();
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BUG_TRAP(answer_prot->slab != NULL);
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err = -ENOBUFS;
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sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
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if (sk == NULL)
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goto out;
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sock_init_data(sock, sk);
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err = 0;
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sk->sk_no_check = answer_no_check;
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if (INET_PROTOSW_REUSE & answer_flags)
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sk->sk_reuse = 1;
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inet = inet_sk(sk);
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inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
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if (SOCK_RAW == sock->type) {
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inet->num = protocol;
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if (IPPROTO_RAW == protocol)
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inet->hdrincl = 1;
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}
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sk->sk_destruct = inet_sock_destruct;
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sk->sk_family = PF_INET6;
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sk->sk_protocol = protocol;
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sk->sk_backlog_rcv = answer->prot->backlog_rcv;
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inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
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np->hop_limit = -1;
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np->mcast_hops = -1;
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np->mc_loop = 1;
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np->pmtudisc = IPV6_PMTUDISC_WANT;
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np->ipv6only = init_net.ipv6.sysctl.bindv6only;
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/* Init the ipv4 part of the socket since we can have sockets
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* using v6 API for ipv4.
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*/
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inet->uc_ttl = -1;
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inet->mc_loop = 1;
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inet->mc_ttl = 1;
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inet->mc_index = 0;
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inet->mc_list = NULL;
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if (ipv4_config.no_pmtu_disc)
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inet->pmtudisc = IP_PMTUDISC_DONT;
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else
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inet->pmtudisc = IP_PMTUDISC_WANT;
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/*
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* Increment only the relevant sk_prot->socks debug field, this changes
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* the previous behaviour of incrementing both the equivalent to
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* answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
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*
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* This allows better debug granularity as we'll know exactly how many
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* UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
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* transport protocol socks. -acme
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*/
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sk_refcnt_debug_inc(sk);
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if (inet->num) {
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/* It assumes that any protocol which allows
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* the user to assign a number at socket
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* creation time automatically shares.
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*/
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inet->sport = htons(inet->num);
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sk->sk_prot->hash(sk);
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}
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if (sk->sk_prot->init) {
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err = sk->sk_prot->init(sk);
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if (err) {
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sk_common_release(sk);
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goto out;
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}
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}
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out:
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return err;
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out_rcu_unlock:
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rcu_read_unlock();
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goto out;
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}
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/* bind for INET6 API */
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int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
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{
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struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
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struct sock *sk = sock->sk;
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct net *net = sock_net(sk);
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__be32 v4addr = 0;
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unsigned short snum;
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int addr_type = 0;
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int err = 0;
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/* If the socket has its own bind function then use it. */
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if (sk->sk_prot->bind)
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return sk->sk_prot->bind(sk, uaddr, addr_len);
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if (addr_len < SIN6_LEN_RFC2133)
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return -EINVAL;
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addr_type = ipv6_addr_type(&addr->sin6_addr);
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if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
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return -EINVAL;
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snum = ntohs(addr->sin6_port);
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if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
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return -EACCES;
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lock_sock(sk);
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/* Check these errors (active socket, double bind). */
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if (sk->sk_state != TCP_CLOSE || inet->num) {
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err = -EINVAL;
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goto out;
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}
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/* Check if the address belongs to the host. */
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if (addr_type == IPV6_ADDR_MAPPED) {
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v4addr = addr->sin6_addr.s6_addr32[3];
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if (inet_addr_type(net, v4addr) != RTN_LOCAL) {
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err = -EADDRNOTAVAIL;
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goto out;
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}
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} else {
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if (addr_type != IPV6_ADDR_ANY) {
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struct net_device *dev = NULL;
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if (addr_type & IPV6_ADDR_LINKLOCAL) {
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if (addr_len >= sizeof(struct sockaddr_in6) &&
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addr->sin6_scope_id) {
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/* Override any existing binding, if another one
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* is supplied by user.
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*/
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sk->sk_bound_dev_if = addr->sin6_scope_id;
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}
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/* Binding to link-local address requires an interface */
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if (!sk->sk_bound_dev_if) {
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err = -EINVAL;
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goto out;
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}
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dev = dev_get_by_index(net, sk->sk_bound_dev_if);
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if (!dev) {
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err = -ENODEV;
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goto out;
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}
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}
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/* ipv4 addr of the socket is invalid. Only the
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* unspecified and mapped address have a v4 equivalent.
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*/
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v4addr = LOOPBACK4_IPV6;
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if (!(addr_type & IPV6_ADDR_MULTICAST)) {
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if (!ipv6_chk_addr(net, &addr->sin6_addr,
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dev, 0)) {
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if (dev)
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dev_put(dev);
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err = -EADDRNOTAVAIL;
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goto out;
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}
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}
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if (dev)
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dev_put(dev);
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}
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}
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inet->rcv_saddr = v4addr;
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inet->saddr = v4addr;
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ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
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if (!(addr_type & IPV6_ADDR_MULTICAST))
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ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
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/* Make sure we are allowed to bind here. */
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if (sk->sk_prot->get_port(sk, snum)) {
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inet_reset_saddr(sk);
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err = -EADDRINUSE;
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goto out;
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}
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if (addr_type != IPV6_ADDR_ANY)
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sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
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if (snum)
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sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
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inet->sport = htons(inet->num);
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inet->dport = 0;
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inet->daddr = 0;
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out:
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release_sock(sk);
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return err;
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}
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EXPORT_SYMBOL(inet6_bind);
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int inet6_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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if (sk == NULL)
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return -EINVAL;
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/* Free mc lists */
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ipv6_sock_mc_close(sk);
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/* Free ac lists */
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ipv6_sock_ac_close(sk);
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return inet_release(sock);
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}
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EXPORT_SYMBOL(inet6_release);
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int inet6_destroy_sock(struct sock *sk)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct sk_buff *skb;
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struct ipv6_txoptions *opt;
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/* Release rx options */
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if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
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kfree_skb(skb);
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/* Free flowlabels */
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fl6_free_socklist(sk);
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/* Free tx options */
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if ((opt = xchg(&np->opt, NULL)) != NULL)
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sock_kfree_s(sk, opt, opt->tot_len);
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return 0;
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}
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EXPORT_SYMBOL_GPL(inet6_destroy_sock);
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/*
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* This does both peername and sockname.
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*/
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int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
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int *uaddr_len, int peer)
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{
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struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
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struct sock *sk = sock->sk;
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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sin->sin6_family = AF_INET6;
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sin->sin6_flowinfo = 0;
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sin->sin6_scope_id = 0;
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if (peer) {
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if (!inet->dport)
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return -ENOTCONN;
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if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
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peer == 1)
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return -ENOTCONN;
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sin->sin6_port = inet->dport;
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ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
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if (np->sndflow)
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sin->sin6_flowinfo = np->flow_label;
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} else {
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if (ipv6_addr_any(&np->rcv_saddr))
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ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
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else
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ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
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|
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sin->sin6_port = inet->sport;
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}
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if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
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sin->sin6_scope_id = sk->sk_bound_dev_if;
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*uaddr_len = sizeof(*sin);
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return(0);
|
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}
|
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|
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EXPORT_SYMBOL(inet6_getname);
|
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|
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int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
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{
|
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struct sock *sk = sock->sk;
|
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struct net *net = sock_net(sk);
|
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|
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switch(cmd)
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{
|
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case SIOCGSTAMP:
|
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return sock_get_timestamp(sk, (struct timeval __user *)arg);
|
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|
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case SIOCGSTAMPNS:
|
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return sock_get_timestampns(sk, (struct timespec __user *)arg);
|
|
|
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case SIOCADDRT:
|
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case SIOCDELRT:
|
|
|
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return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
|
|
|
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case SIOCSIFADDR:
|
|
return addrconf_add_ifaddr(net, (void __user *) arg);
|
|
case SIOCDIFADDR:
|
|
return addrconf_del_ifaddr(net, (void __user *) arg);
|
|
case SIOCSIFDSTADDR:
|
|
return addrconf_set_dstaddr(net, (void __user *) arg);
|
|
default:
|
|
if (!sk->sk_prot->ioctl)
|
|
return -ENOIOCTLCMD;
|
|
return sk->sk_prot->ioctl(sk, cmd, arg);
|
|
}
|
|
/*NOTREACHED*/
|
|
return(0);
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_ioctl);
|
|
|
|
const struct proto_ops inet6_stream_ops = {
|
|
.family = PF_INET6,
|
|
.owner = THIS_MODULE,
|
|
.release = inet6_release,
|
|
.bind = inet6_bind,
|
|
.connect = inet_stream_connect, /* ok */
|
|
.socketpair = sock_no_socketpair, /* a do nothing */
|
|
.accept = inet_accept, /* ok */
|
|
.getname = inet6_getname,
|
|
.poll = tcp_poll, /* ok */
|
|
.ioctl = inet6_ioctl, /* must change */
|
|
.listen = inet_listen, /* ok */
|
|
.shutdown = inet_shutdown, /* ok */
|
|
.setsockopt = sock_common_setsockopt, /* ok */
|
|
.getsockopt = sock_common_getsockopt, /* ok */
|
|
.sendmsg = tcp_sendmsg, /* ok */
|
|
.recvmsg = sock_common_recvmsg, /* ok */
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = tcp_sendpage,
|
|
.splice_read = tcp_splice_read,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
const struct proto_ops inet6_dgram_ops = {
|
|
.family = PF_INET6,
|
|
.owner = THIS_MODULE,
|
|
.release = inet6_release,
|
|
.bind = inet6_bind,
|
|
.connect = inet_dgram_connect, /* ok */
|
|
.socketpair = sock_no_socketpair, /* a do nothing */
|
|
.accept = sock_no_accept, /* a do nothing */
|
|
.getname = inet6_getname,
|
|
.poll = udp_poll, /* ok */
|
|
.ioctl = inet6_ioctl, /* must change */
|
|
.listen = sock_no_listen, /* ok */
|
|
.shutdown = inet_shutdown, /* ok */
|
|
.setsockopt = sock_common_setsockopt, /* ok */
|
|
.getsockopt = sock_common_getsockopt, /* ok */
|
|
.sendmsg = inet_sendmsg, /* ok */
|
|
.recvmsg = sock_common_recvmsg, /* ok */
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
static struct net_proto_family inet6_family_ops = {
|
|
.family = PF_INET6,
|
|
.create = inet6_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
int inet6_register_protosw(struct inet_protosw *p)
|
|
{
|
|
struct list_head *lh;
|
|
struct inet_protosw *answer;
|
|
struct list_head *last_perm;
|
|
int protocol = p->protocol;
|
|
int ret;
|
|
|
|
spin_lock_bh(&inetsw6_lock);
|
|
|
|
ret = -EINVAL;
|
|
if (p->type >= SOCK_MAX)
|
|
goto out_illegal;
|
|
|
|
/* If we are trying to override a permanent protocol, bail. */
|
|
answer = NULL;
|
|
ret = -EPERM;
|
|
last_perm = &inetsw6[p->type];
|
|
list_for_each(lh, &inetsw6[p->type]) {
|
|
answer = list_entry(lh, struct inet_protosw, list);
|
|
|
|
/* Check only the non-wild match. */
|
|
if (INET_PROTOSW_PERMANENT & answer->flags) {
|
|
if (protocol == answer->protocol)
|
|
break;
|
|
last_perm = lh;
|
|
}
|
|
|
|
answer = NULL;
|
|
}
|
|
if (answer)
|
|
goto out_permanent;
|
|
|
|
/* Add the new entry after the last permanent entry if any, so that
|
|
* the new entry does not override a permanent entry when matched with
|
|
* a wild-card protocol. But it is allowed to override any existing
|
|
* non-permanent entry. This means that when we remove this entry, the
|
|
* system automatically returns to the old behavior.
|
|
*/
|
|
list_add_rcu(&p->list, last_perm);
|
|
ret = 0;
|
|
out:
|
|
spin_unlock_bh(&inetsw6_lock);
|
|
return ret;
|
|
|
|
out_permanent:
|
|
printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
|
|
protocol);
|
|
goto out;
|
|
|
|
out_illegal:
|
|
printk(KERN_ERR
|
|
"Ignoring attempt to register invalid socket type %d.\n",
|
|
p->type);
|
|
goto out;
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_register_protosw);
|
|
|
|
void
|
|
inet6_unregister_protosw(struct inet_protosw *p)
|
|
{
|
|
if (INET_PROTOSW_PERMANENT & p->flags) {
|
|
printk(KERN_ERR
|
|
"Attempt to unregister permanent protocol %d.\n",
|
|
p->protocol);
|
|
} else {
|
|
spin_lock_bh(&inetsw6_lock);
|
|
list_del_rcu(&p->list);
|
|
spin_unlock_bh(&inetsw6_lock);
|
|
|
|
synchronize_net();
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_unregister_protosw);
|
|
|
|
int inet6_sk_rebuild_header(struct sock *sk)
|
|
{
|
|
int err;
|
|
struct dst_entry *dst;
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
|
|
dst = __sk_dst_check(sk, np->dst_cookie);
|
|
|
|
if (dst == NULL) {
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct in6_addr *final_p = NULL, final;
|
|
struct flowi fl;
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
fl.proto = sk->sk_protocol;
|
|
ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
|
|
ipv6_addr_copy(&fl.fl6_src, &np->saddr);
|
|
fl.fl6_flowlabel = np->flow_label;
|
|
fl.oif = sk->sk_bound_dev_if;
|
|
fl.fl_ip_dport = inet->dport;
|
|
fl.fl_ip_sport = inet->sport;
|
|
security_sk_classify_flow(sk, &fl);
|
|
|
|
if (np->opt && np->opt->srcrt) {
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
|
|
ipv6_addr_copy(&final, &fl.fl6_dst);
|
|
ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
|
|
final_p = &final;
|
|
}
|
|
|
|
err = ip6_dst_lookup(sk, &dst, &fl);
|
|
if (err) {
|
|
sk->sk_route_caps = 0;
|
|
return err;
|
|
}
|
|
if (final_p)
|
|
ipv6_addr_copy(&fl.fl6_dst, final_p);
|
|
|
|
if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
|
|
sk->sk_err_soft = -err;
|
|
return err;
|
|
}
|
|
|
|
__ip6_dst_store(sk, dst, NULL, NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
|
|
|
|
int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct inet6_skb_parm *opt = IP6CB(skb);
|
|
|
|
if (np->rxopt.all) {
|
|
if ((opt->hop && (np->rxopt.bits.hopopts ||
|
|
np->rxopt.bits.ohopopts)) ||
|
|
((IPV6_FLOWINFO_MASK &
|
|
*(__be32 *)skb_network_header(skb)) &&
|
|
np->rxopt.bits.rxflow) ||
|
|
(opt->srcrt && (np->rxopt.bits.srcrt ||
|
|
np->rxopt.bits.osrcrt)) ||
|
|
((opt->dst1 || opt->dst0) &&
|
|
(np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
|
|
|
|
static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
|
|
int proto)
|
|
{
|
|
struct inet6_protocol *ops = NULL;
|
|
|
|
for (;;) {
|
|
struct ipv6_opt_hdr *opth;
|
|
int len;
|
|
|
|
if (proto != NEXTHDR_HOP) {
|
|
ops = rcu_dereference(inet6_protos[proto]);
|
|
|
|
if (unlikely(!ops))
|
|
break;
|
|
|
|
if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
|
|
break;
|
|
}
|
|
|
|
if (unlikely(!pskb_may_pull(skb, 8)))
|
|
break;
|
|
|
|
opth = (void *)skb->data;
|
|
len = ipv6_optlen(opth);
|
|
|
|
if (unlikely(!pskb_may_pull(skb, len)))
|
|
break;
|
|
|
|
proto = opth->nexthdr;
|
|
__skb_pull(skb, len);
|
|
}
|
|
|
|
return ops;
|
|
}
|
|
|
|
static int ipv6_gso_send_check(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *ipv6h;
|
|
struct inet6_protocol *ops;
|
|
int err = -EINVAL;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
|
|
goto out;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
__skb_pull(skb, sizeof(*ipv6h));
|
|
err = -EPROTONOSUPPORT;
|
|
|
|
rcu_read_lock();
|
|
ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
|
|
if (likely(ops && ops->gso_send_check)) {
|
|
skb_reset_transport_header(skb);
|
|
err = ops->gso_send_check(skb);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
|
|
{
|
|
struct sk_buff *segs = ERR_PTR(-EINVAL);
|
|
struct ipv6hdr *ipv6h;
|
|
struct inet6_protocol *ops;
|
|
|
|
if (!(features & NETIF_F_V6_CSUM))
|
|
features &= ~NETIF_F_SG;
|
|
|
|
if (unlikely(skb_shinfo(skb)->gso_type &
|
|
~(SKB_GSO_UDP |
|
|
SKB_GSO_DODGY |
|
|
SKB_GSO_TCP_ECN |
|
|
SKB_GSO_TCPV6 |
|
|
0)))
|
|
goto out;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
|
|
goto out;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
__skb_pull(skb, sizeof(*ipv6h));
|
|
segs = ERR_PTR(-EPROTONOSUPPORT);
|
|
|
|
rcu_read_lock();
|
|
ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
|
|
if (likely(ops && ops->gso_segment)) {
|
|
skb_reset_transport_header(skb);
|
|
segs = ops->gso_segment(skb, features);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (unlikely(IS_ERR(segs)))
|
|
goto out;
|
|
|
|
for (skb = segs; skb; skb = skb->next) {
|
|
ipv6h = ipv6_hdr(skb);
|
|
ipv6h->payload_len = htons(skb->len - skb->mac_len -
|
|
sizeof(*ipv6h));
|
|
}
|
|
|
|
out:
|
|
return segs;
|
|
}
|
|
|
|
static struct packet_type ipv6_packet_type = {
|
|
.type = __constant_htons(ETH_P_IPV6),
|
|
.func = ipv6_rcv,
|
|
.gso_send_check = ipv6_gso_send_check,
|
|
.gso_segment = ipv6_gso_segment,
|
|
};
|
|
|
|
static int __init ipv6_packet_init(void)
|
|
{
|
|
dev_add_pack(&ipv6_packet_type);
|
|
return 0;
|
|
}
|
|
|
|
static void ipv6_packet_cleanup(void)
|
|
{
|
|
dev_remove_pack(&ipv6_packet_type);
|
|
}
|
|
|
|
static int __init init_ipv6_mibs(void)
|
|
{
|
|
if (snmp_mib_init((void **)ipv6_statistics,
|
|
sizeof(struct ipstats_mib)) < 0)
|
|
goto err_ip_mib;
|
|
if (snmp_mib_init((void **)icmpv6_statistics,
|
|
sizeof(struct icmpv6_mib)) < 0)
|
|
goto err_icmp_mib;
|
|
if (snmp_mib_init((void **)icmpv6msg_statistics,
|
|
sizeof(struct icmpv6msg_mib)) < 0)
|
|
goto err_icmpmsg_mib;
|
|
if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
|
|
goto err_udp_mib;
|
|
if (snmp_mib_init((void **)udplite_stats_in6,
|
|
sizeof (struct udp_mib)) < 0)
|
|
goto err_udplite_mib;
|
|
return 0;
|
|
|
|
err_udplite_mib:
|
|
snmp_mib_free((void **)udp_stats_in6);
|
|
err_udp_mib:
|
|
snmp_mib_free((void **)icmpv6msg_statistics);
|
|
err_icmpmsg_mib:
|
|
snmp_mib_free((void **)icmpv6_statistics);
|
|
err_icmp_mib:
|
|
snmp_mib_free((void **)ipv6_statistics);
|
|
err_ip_mib:
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
static void cleanup_ipv6_mibs(void)
|
|
{
|
|
snmp_mib_free((void **)ipv6_statistics);
|
|
snmp_mib_free((void **)icmpv6_statistics);
|
|
snmp_mib_free((void **)icmpv6msg_statistics);
|
|
snmp_mib_free((void **)udp_stats_in6);
|
|
snmp_mib_free((void **)udplite_stats_in6);
|
|
}
|
|
|
|
static int inet6_net_init(struct net *net)
|
|
{
|
|
int err = 0;
|
|
|
|
net->ipv6.sysctl.bindv6only = 0;
|
|
net->ipv6.sysctl.flush_delay = 0;
|
|
net->ipv6.sysctl.ip6_rt_max_size = 4096;
|
|
net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
|
|
net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
|
|
net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
|
|
net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
|
|
net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
|
|
net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
|
|
net->ipv6.sysctl.icmpv6_time = 1*HZ;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
err = udp6_proc_init(net);
|
|
if (err)
|
|
goto out;
|
|
err = tcp6_proc_init(net);
|
|
if (err)
|
|
goto proc_tcp6_fail;
|
|
err = ac6_proc_init(net);
|
|
if (err)
|
|
goto proc_ac6_fail;
|
|
out:
|
|
#endif
|
|
return err;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_ac6_fail:
|
|
tcp6_proc_exit(net);
|
|
proc_tcp6_fail:
|
|
udp6_proc_exit(net);
|
|
goto out;
|
|
#endif
|
|
}
|
|
|
|
static void inet6_net_exit(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
udp6_proc_exit(net);
|
|
tcp6_proc_exit(net);
|
|
ac6_proc_exit(net);
|
|
#endif
|
|
}
|
|
|
|
static struct pernet_operations inet6_net_ops = {
|
|
.init = inet6_net_init,
|
|
.exit = inet6_net_exit,
|
|
};
|
|
|
|
static int __init inet6_init(void)
|
|
{
|
|
struct sk_buff *dummy_skb;
|
|
struct list_head *r;
|
|
int err;
|
|
|
|
BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
|
|
|
|
err = proto_register(&tcpv6_prot, 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = proto_register(&udpv6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_tcp_proto;
|
|
|
|
err = proto_register(&udplitev6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_udp_proto;
|
|
|
|
err = proto_register(&rawv6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_udplite_proto;
|
|
|
|
|
|
/* Register the socket-side information for inet6_create. */
|
|
for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
|
|
INIT_LIST_HEAD(r);
|
|
|
|
/* We MUST register RAW sockets before we create the ICMP6,
|
|
* IGMP6, or NDISC control sockets.
|
|
*/
|
|
err = rawv6_init();
|
|
if (err)
|
|
goto out_unregister_raw_proto;
|
|
|
|
/* Register the family here so that the init calls below will
|
|
* be able to create sockets. (?? is this dangerous ??)
|
|
*/
|
|
err = sock_register(&inet6_family_ops);
|
|
if (err)
|
|
goto out_sock_register_fail;
|
|
|
|
/* Initialise ipv6 mibs */
|
|
err = init_ipv6_mibs();
|
|
if (err)
|
|
goto out_unregister_sock;
|
|
|
|
/*
|
|
* ipngwg API draft makes clear that the correct semantics
|
|
* for TCP and UDP is to consider one TCP and UDP instance
|
|
* in a host availiable by both INET and INET6 APIs and
|
|
* able to communicate via both network protocols.
|
|
*/
|
|
|
|
err = register_pernet_subsys(&inet6_net_ops);
|
|
if (err)
|
|
goto register_pernet_fail;
|
|
err = icmpv6_init();
|
|
if (err)
|
|
goto icmp_fail;
|
|
#ifdef CONFIG_IPV6_MROUTE
|
|
ip6_mr_init();
|
|
#endif
|
|
err = ndisc_init();
|
|
if (err)
|
|
goto ndisc_fail;
|
|
err = igmp6_init();
|
|
if (err)
|
|
goto igmp_fail;
|
|
err = ipv6_netfilter_init();
|
|
if (err)
|
|
goto netfilter_fail;
|
|
/* Create /proc/foo6 entries. */
|
|
#ifdef CONFIG_PROC_FS
|
|
err = -ENOMEM;
|
|
if (raw6_proc_init())
|
|
goto proc_raw6_fail;
|
|
if (udplite6_proc_init())
|
|
goto proc_udplite6_fail;
|
|
if (ipv6_misc_proc_init())
|
|
goto proc_misc6_fail;
|
|
if (if6_proc_init())
|
|
goto proc_if6_fail;
|
|
#endif
|
|
err = ip6_route_init();
|
|
if (err)
|
|
goto ip6_route_fail;
|
|
err = ip6_flowlabel_init();
|
|
if (err)
|
|
goto ip6_flowlabel_fail;
|
|
err = addrconf_init();
|
|
if (err)
|
|
goto addrconf_fail;
|
|
|
|
/* Init v6 extension headers. */
|
|
err = ipv6_exthdrs_init();
|
|
if (err)
|
|
goto ipv6_exthdrs_fail;
|
|
|
|
err = ipv6_frag_init();
|
|
if (err)
|
|
goto ipv6_frag_fail;
|
|
|
|
/* Init v6 transport protocols. */
|
|
err = udpv6_init();
|
|
if (err)
|
|
goto udpv6_fail;
|
|
|
|
err = udplitev6_init();
|
|
if (err)
|
|
goto udplitev6_fail;
|
|
|
|
err = tcpv6_init();
|
|
if (err)
|
|
goto tcpv6_fail;
|
|
|
|
err = ipv6_packet_init();
|
|
if (err)
|
|
goto ipv6_packet_fail;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err = ipv6_sysctl_register();
|
|
if (err)
|
|
goto sysctl_fail;
|
|
#endif
|
|
out:
|
|
return err;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
sysctl_fail:
|
|
ipv6_packet_cleanup();
|
|
#endif
|
|
ipv6_packet_fail:
|
|
tcpv6_exit();
|
|
tcpv6_fail:
|
|
udplitev6_exit();
|
|
udplitev6_fail:
|
|
udpv6_exit();
|
|
udpv6_fail:
|
|
ipv6_frag_exit();
|
|
ipv6_frag_fail:
|
|
ipv6_exthdrs_exit();
|
|
ipv6_exthdrs_fail:
|
|
addrconf_cleanup();
|
|
addrconf_fail:
|
|
ip6_flowlabel_cleanup();
|
|
ip6_flowlabel_fail:
|
|
ip6_route_cleanup();
|
|
ip6_route_fail:
|
|
#ifdef CONFIG_PROC_FS
|
|
if6_proc_exit();
|
|
proc_if6_fail:
|
|
ipv6_misc_proc_exit();
|
|
proc_misc6_fail:
|
|
udplite6_proc_exit();
|
|
proc_udplite6_fail:
|
|
raw6_proc_exit();
|
|
proc_raw6_fail:
|
|
#endif
|
|
ipv6_netfilter_fini();
|
|
netfilter_fail:
|
|
igmp6_cleanup();
|
|
igmp_fail:
|
|
ndisc_cleanup();
|
|
ndisc_fail:
|
|
icmpv6_cleanup();
|
|
icmp_fail:
|
|
unregister_pernet_subsys(&inet6_net_ops);
|
|
register_pernet_fail:
|
|
cleanup_ipv6_mibs();
|
|
out_unregister_sock:
|
|
sock_unregister(PF_INET6);
|
|
rtnl_unregister_all(PF_INET6);
|
|
out_sock_register_fail:
|
|
rawv6_exit();
|
|
out_unregister_raw_proto:
|
|
proto_unregister(&rawv6_prot);
|
|
out_unregister_udplite_proto:
|
|
proto_unregister(&udplitev6_prot);
|
|
out_unregister_udp_proto:
|
|
proto_unregister(&udpv6_prot);
|
|
out_unregister_tcp_proto:
|
|
proto_unregister(&tcpv6_prot);
|
|
goto out;
|
|
}
|
|
module_init(inet6_init);
|
|
|
|
static void __exit inet6_exit(void)
|
|
{
|
|
/* First of all disallow new sockets creation. */
|
|
sock_unregister(PF_INET6);
|
|
/* Disallow any further netlink messages */
|
|
rtnl_unregister_all(PF_INET6);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
ipv6_sysctl_unregister();
|
|
#endif
|
|
udpv6_exit();
|
|
udplitev6_exit();
|
|
tcpv6_exit();
|
|
|
|
/* Cleanup code parts. */
|
|
ipv6_packet_cleanup();
|
|
ipv6_frag_exit();
|
|
ipv6_exthdrs_exit();
|
|
addrconf_cleanup();
|
|
ip6_flowlabel_cleanup();
|
|
ip6_route_cleanup();
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
/* Cleanup code parts. */
|
|
if6_proc_exit();
|
|
ipv6_misc_proc_exit();
|
|
udplite6_proc_exit();
|
|
raw6_proc_exit();
|
|
#endif
|
|
ipv6_netfilter_fini();
|
|
igmp6_cleanup();
|
|
ndisc_cleanup();
|
|
icmpv6_cleanup();
|
|
rawv6_exit();
|
|
|
|
unregister_pernet_subsys(&inet6_net_ops);
|
|
cleanup_ipv6_mibs();
|
|
proto_unregister(&rawv6_prot);
|
|
proto_unregister(&udplitev6_prot);
|
|
proto_unregister(&udpv6_prot);
|
|
proto_unregister(&tcpv6_prot);
|
|
}
|
|
module_exit(inet6_exit);
|
|
|
|
MODULE_ALIAS_NETPROTO(PF_INET6);
|