![Simon Horman](/assets/img/avatar_default.png)
This corrects an regression introduced by "net: Use 16bits for *_headers fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In that case sk_buff_data_t will be a pointer, however, skb->{network,transport}_header is now __u16. Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: David S. Miller <davem@davemloft.net>
1086 lines
29 KiB
C
1086 lines
29 KiB
C
/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2002, 2004
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* Copyright (c) 2001 Nokia, Inc.
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* Copyright (c) 2001 La Monte H.P. Yarroll
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* Copyright (c) 2002-2003 Intel Corp.
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*
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* This file is part of the SCTP kernel implementation
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*
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* SCTP over IPv6.
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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*
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* Or submit a bug report through the following website:
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* http://www.sf.net/projects/lksctp
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*
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* Written or modified by:
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* Le Yanqun <yanqun.le@nokia.com>
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* Hui Huang <hui.huang@nokia.com>
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Sridhar Samudrala <sri@us.ibm.com>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Ardelle Fan <ardelle.fan@intel.com>
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*
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* Based on:
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* linux/net/ipv6/tcp_ipv6.c
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*
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* be incorporated into the next SCTP release.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.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/sockios.h>
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#include <linux/net.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/netdevice.h>
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#include <linux/init.h>
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#include <linux/ipsec.h>
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#include <linux/slab.h>
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#include <linux/ipv6.h>
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#include <linux/icmpv6.h>
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#include <linux/random.h>
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#include <linux/seq_file.h>
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#include <net/protocol.h>
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#include <net/ndisc.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/transp_v6.h>
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#include <net/addrconf.h>
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#include <net/ip6_route.h>
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#include <net/inet_common.h>
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#include <net/inet_ecn.h>
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#include <net/sctp/sctp.h>
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#include <asm/uaccess.h>
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static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
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union sctp_addr *s2);
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static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
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__be16 port);
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static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
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const union sctp_addr *addr2);
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/* Event handler for inet6 address addition/deletion events.
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* The sctp_local_addr_list needs to be protocted by a spin lock since
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* multiple notifiers (say IPv4 and IPv6) may be running at the same
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* time and thus corrupt the list.
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* The reader side is protected with RCU.
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*/
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static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
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void *ptr)
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{
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struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
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struct sctp_sockaddr_entry *addr = NULL;
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struct sctp_sockaddr_entry *temp;
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struct net *net = dev_net(ifa->idev->dev);
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int found = 0;
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switch (ev) {
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case NETDEV_UP:
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addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
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if (addr) {
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addr->a.v6.sin6_family = AF_INET6;
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addr->a.v6.sin6_port = 0;
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addr->a.v6.sin6_addr = ifa->addr;
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addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
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addr->valid = 1;
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spin_lock_bh(&net->sctp.local_addr_lock);
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list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
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sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
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spin_unlock_bh(&net->sctp.local_addr_lock);
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}
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break;
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case NETDEV_DOWN:
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spin_lock_bh(&net->sctp.local_addr_lock);
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list_for_each_entry_safe(addr, temp,
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&net->sctp.local_addr_list, list) {
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if (addr->a.sa.sa_family == AF_INET6 &&
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ipv6_addr_equal(&addr->a.v6.sin6_addr,
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&ifa->addr)) {
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sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
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found = 1;
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addr->valid = 0;
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list_del_rcu(&addr->list);
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break;
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}
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}
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spin_unlock_bh(&net->sctp.local_addr_lock);
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if (found)
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kfree_rcu(addr, rcu);
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block sctp_inet6addr_notifier = {
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.notifier_call = sctp_inet6addr_event,
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};
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/* ICMP error handler. */
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SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, __be32 info)
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{
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struct inet6_dev *idev;
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struct sock *sk;
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struct sctp_association *asoc;
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struct sctp_transport *transport;
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struct ipv6_pinfo *np;
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__be16 saveip, savesctp;
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int err;
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struct net *net = dev_net(skb->dev);
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idev = in6_dev_get(skb->dev);
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/* Fix up skb to look at the embedded net header. */
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saveip = skb->network_header;
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savesctp = skb->transport_header;
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skb_reset_network_header(skb);
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skb_set_transport_header(skb, offset);
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sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
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/* Put back, the original pointers. */
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skb->network_header = saveip;
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skb->transport_header = savesctp;
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if (!sk) {
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ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS);
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goto out;
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}
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/* Warning: The sock lock is held. Remember to call
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* sctp_err_finish!
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*/
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switch (type) {
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case ICMPV6_PKT_TOOBIG:
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sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
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goto out_unlock;
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case ICMPV6_PARAMPROB:
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if (ICMPV6_UNK_NEXTHDR == code) {
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sctp_icmp_proto_unreachable(sk, asoc, transport);
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goto out_unlock;
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}
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break;
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case NDISC_REDIRECT:
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sctp_icmp_redirect(sk, transport, skb);
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break;
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default:
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break;
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}
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np = inet6_sk(sk);
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icmpv6_err_convert(type, code, &err);
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if (!sock_owned_by_user(sk) && np->recverr) {
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sk->sk_err = err;
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sk->sk_error_report(sk);
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} else { /* Only an error on timeout */
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sk->sk_err_soft = err;
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}
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out_unlock:
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sctp_err_finish(sk, asoc);
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out:
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if (likely(idev != NULL))
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in6_dev_put(idev);
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}
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/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
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static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
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{
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struct sock *sk = skb->sk;
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct flowi6 fl6;
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_proto = sk->sk_protocol;
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/* Fill in the dest address from the route entry passed with the skb
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* and the source address from the transport.
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*/
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fl6.daddr = transport->ipaddr.v6.sin6_addr;
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fl6.saddr = transport->saddr.v6.sin6_addr;
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fl6.flowlabel = np->flow_label;
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IP6_ECN_flow_xmit(sk, fl6.flowlabel);
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if (ipv6_addr_type(&fl6.saddr) & IPV6_ADDR_LINKLOCAL)
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fl6.flowi6_oif = transport->saddr.v6.sin6_scope_id;
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else
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fl6.flowi6_oif = sk->sk_bound_dev_if;
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if (np->opt && np->opt->srcrt) {
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struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
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fl6.daddr = *rt0->addr;
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}
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SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
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__func__, skb, skb->len,
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&fl6.saddr, &fl6.daddr);
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SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
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if (!(transport->param_flags & SPP_PMTUD_ENABLE))
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skb->local_df = 1;
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return ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
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}
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/* Returns the dst cache entry for the given source and destination ip
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* addresses.
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*/
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static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
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struct flowi *fl, struct sock *sk)
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{
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struct sctp_association *asoc = t->asoc;
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struct dst_entry *dst = NULL;
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struct flowi6 *fl6 = &fl->u.ip6;
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struct sctp_bind_addr *bp;
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struct sctp_sockaddr_entry *laddr;
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union sctp_addr *baddr = NULL;
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union sctp_addr *daddr = &t->ipaddr;
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union sctp_addr dst_saddr;
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__u8 matchlen = 0;
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__u8 bmatchlen;
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sctp_scope_t scope;
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memset(fl6, 0, sizeof(struct flowi6));
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fl6->daddr = daddr->v6.sin6_addr;
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fl6->fl6_dport = daddr->v6.sin6_port;
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fl6->flowi6_proto = IPPROTO_SCTP;
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if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
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fl6->flowi6_oif = daddr->v6.sin6_scope_id;
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SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
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if (asoc)
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fl6->fl6_sport = htons(asoc->base.bind_addr.port);
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if (saddr) {
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fl6->saddr = saddr->v6.sin6_addr;
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fl6->fl6_sport = saddr->v6.sin6_port;
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SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
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}
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dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
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if (!asoc || saddr)
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goto out;
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bp = &asoc->base.bind_addr;
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scope = sctp_scope(daddr);
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/* ip6_dst_lookup has filled in the fl6->saddr for us. Check
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* to see if we can use it.
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*/
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if (!IS_ERR(dst)) {
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/* Walk through the bind address list and look for a bind
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* address that matches the source address of the returned dst.
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*/
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sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
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rcu_read_lock();
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list_for_each_entry_rcu(laddr, &bp->address_list, list) {
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if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
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continue;
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/* Do not compare against v4 addrs */
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if ((laddr->a.sa.sa_family == AF_INET6) &&
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(sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
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rcu_read_unlock();
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goto out;
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}
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}
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rcu_read_unlock();
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/* None of the bound addresses match the source address of the
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* dst. So release it.
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*/
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dst_release(dst);
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dst = NULL;
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}
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/* Walk through the bind address list and try to get the
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* best source address for a given destination.
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*/
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rcu_read_lock();
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list_for_each_entry_rcu(laddr, &bp->address_list, list) {
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if (!laddr->valid)
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continue;
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if ((laddr->state == SCTP_ADDR_SRC) &&
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(laddr->a.sa.sa_family == AF_INET6) &&
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(scope <= sctp_scope(&laddr->a))) {
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bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
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if (!baddr || (matchlen < bmatchlen)) {
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baddr = &laddr->a;
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matchlen = bmatchlen;
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}
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}
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}
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rcu_read_unlock();
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if (baddr) {
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fl6->saddr = baddr->v6.sin6_addr;
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fl6->fl6_sport = baddr->v6.sin6_port;
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dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
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}
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out:
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if (!IS_ERR_OR_NULL(dst)) {
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struct rt6_info *rt;
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rt = (struct rt6_info *)dst;
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t->dst = dst;
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SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
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&rt->rt6i_dst.addr, &fl6->saddr);
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} else {
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t->dst = NULL;
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SCTP_DEBUG_PRINTK("NO ROUTE\n");
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}
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}
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/* Returns the number of consecutive initial bits that match in the 2 ipv6
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* addresses.
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*/
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static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
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union sctp_addr *s2)
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{
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return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
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}
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/* Fills in the source address(saddr) based on the destination address(daddr)
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* and asoc's bind address list.
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*/
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static void sctp_v6_get_saddr(struct sctp_sock *sk,
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struct sctp_transport *t,
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struct flowi *fl)
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{
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struct flowi6 *fl6 = &fl->u.ip6;
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union sctp_addr *saddr = &t->saddr;
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SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
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if (t->dst) {
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saddr->v6.sin6_family = AF_INET6;
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saddr->v6.sin6_addr = fl6->saddr;
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}
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}
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/* Make a copy of all potential local addresses. */
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static void sctp_v6_copy_addrlist(struct list_head *addrlist,
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struct net_device *dev)
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{
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struct inet6_dev *in6_dev;
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struct inet6_ifaddr *ifp;
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struct sctp_sockaddr_entry *addr;
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rcu_read_lock();
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if ((in6_dev = __in6_dev_get(dev)) == NULL) {
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rcu_read_unlock();
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return;
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}
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read_lock_bh(&in6_dev->lock);
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list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
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/* Add the address to the local list. */
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addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
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if (addr) {
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addr->a.v6.sin6_family = AF_INET6;
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addr->a.v6.sin6_port = 0;
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addr->a.v6.sin6_addr = ifp->addr;
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addr->a.v6.sin6_scope_id = dev->ifindex;
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addr->valid = 1;
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INIT_LIST_HEAD(&addr->list);
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list_add_tail(&addr->list, addrlist);
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}
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}
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read_unlock_bh(&in6_dev->lock);
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rcu_read_unlock();
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}
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/* Initialize a sockaddr_storage from in incoming skb. */
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static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
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int is_saddr)
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{
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__be16 *port;
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struct sctphdr *sh;
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port = &addr->v6.sin6_port;
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addr->v6.sin6_family = AF_INET6;
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addr->v6.sin6_flowinfo = 0; /* FIXME */
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addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
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sh = sctp_hdr(skb);
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if (is_saddr) {
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*port = sh->source;
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addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
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} else {
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*port = sh->dest;
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addr->v6.sin6_addr = ipv6_hdr(skb)->daddr;
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}
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}
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/* Initialize an sctp_addr from a socket. */
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static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
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{
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addr->v6.sin6_family = AF_INET6;
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addr->v6.sin6_port = 0;
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addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
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}
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/* Initialize sk->sk_rcv_saddr from sctp_addr. */
|
|
static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
|
|
{
|
|
if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
|
|
inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
|
|
inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
|
|
inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
|
|
inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
|
|
addr->v4.sin_addr.s_addr;
|
|
} else {
|
|
inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
|
|
}
|
|
}
|
|
|
|
/* Initialize sk->sk_daddr from sctp_addr. */
|
|
static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
|
|
{
|
|
if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
|
|
inet6_sk(sk)->daddr.s6_addr32[0] = 0;
|
|
inet6_sk(sk)->daddr.s6_addr32[1] = 0;
|
|
inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
|
|
inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
|
|
} else {
|
|
inet6_sk(sk)->daddr = addr->v6.sin6_addr;
|
|
}
|
|
}
|
|
|
|
/* Initialize a sctp_addr from an address parameter. */
|
|
static void sctp_v6_from_addr_param(union sctp_addr *addr,
|
|
union sctp_addr_param *param,
|
|
__be16 port, int iif)
|
|
{
|
|
addr->v6.sin6_family = AF_INET6;
|
|
addr->v6.sin6_port = port;
|
|
addr->v6.sin6_flowinfo = 0; /* BUG */
|
|
addr->v6.sin6_addr = param->v6.addr;
|
|
addr->v6.sin6_scope_id = iif;
|
|
}
|
|
|
|
/* Initialize an address parameter from a sctp_addr and return the length
|
|
* of the address parameter.
|
|
*/
|
|
static int sctp_v6_to_addr_param(const union sctp_addr *addr,
|
|
union sctp_addr_param *param)
|
|
{
|
|
int length = sizeof(sctp_ipv6addr_param_t);
|
|
|
|
param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
|
|
param->v6.param_hdr.length = htons(length);
|
|
param->v6.addr = addr->v6.sin6_addr;
|
|
|
|
return length;
|
|
}
|
|
|
|
/* Initialize a sctp_addr from struct in6_addr. */
|
|
static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
|
|
__be16 port)
|
|
{
|
|
addr->sa.sa_family = AF_INET6;
|
|
addr->v6.sin6_port = port;
|
|
addr->v6.sin6_addr = *saddr;
|
|
}
|
|
|
|
/* Compare addresses exactly.
|
|
* v4-mapped-v6 is also in consideration.
|
|
*/
|
|
static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
|
|
const union sctp_addr *addr2)
|
|
{
|
|
if (addr1->sa.sa_family != addr2->sa.sa_family) {
|
|
if (addr1->sa.sa_family == AF_INET &&
|
|
addr2->sa.sa_family == AF_INET6 &&
|
|
ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
|
|
if (addr2->v6.sin6_port == addr1->v4.sin_port &&
|
|
addr2->v6.sin6_addr.s6_addr32[3] ==
|
|
addr1->v4.sin_addr.s_addr)
|
|
return 1;
|
|
}
|
|
if (addr2->sa.sa_family == AF_INET &&
|
|
addr1->sa.sa_family == AF_INET6 &&
|
|
ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
|
|
if (addr1->v6.sin6_port == addr2->v4.sin_port &&
|
|
addr1->v6.sin6_addr.s6_addr32[3] ==
|
|
addr2->v4.sin_addr.s_addr)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
|
|
return 0;
|
|
/* If this is a linklocal address, compare the scope_id. */
|
|
if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
|
|
if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
|
|
(addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Initialize addr struct to INADDR_ANY. */
|
|
static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
|
|
{
|
|
memset(addr, 0x00, sizeof(union sctp_addr));
|
|
addr->v6.sin6_family = AF_INET6;
|
|
addr->v6.sin6_port = port;
|
|
}
|
|
|
|
/* Is this a wildcard address? */
|
|
static int sctp_v6_is_any(const union sctp_addr *addr)
|
|
{
|
|
return ipv6_addr_any(&addr->v6.sin6_addr);
|
|
}
|
|
|
|
/* Should this be available for binding? */
|
|
static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
|
|
{
|
|
int type;
|
|
const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
|
|
|
|
type = ipv6_addr_type(in6);
|
|
if (IPV6_ADDR_ANY == type)
|
|
return 1;
|
|
if (type == IPV6_ADDR_MAPPED) {
|
|
if (sp && !sp->v4mapped)
|
|
return 0;
|
|
if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
|
|
return 0;
|
|
sctp_v6_map_v4(addr);
|
|
return sctp_get_af_specific(AF_INET)->available(addr, sp);
|
|
}
|
|
if (!(type & IPV6_ADDR_UNICAST))
|
|
return 0;
|
|
|
|
return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0);
|
|
}
|
|
|
|
/* This function checks if the address is a valid address to be used for
|
|
* SCTP.
|
|
*
|
|
* Output:
|
|
* Return 0 - If the address is a non-unicast or an illegal address.
|
|
* Return 1 - If the address is a unicast.
|
|
*/
|
|
static int sctp_v6_addr_valid(union sctp_addr *addr,
|
|
struct sctp_sock *sp,
|
|
const struct sk_buff *skb)
|
|
{
|
|
int ret = ipv6_addr_type(&addr->v6.sin6_addr);
|
|
|
|
/* Support v4-mapped-v6 address. */
|
|
if (ret == IPV6_ADDR_MAPPED) {
|
|
/* Note: This routine is used in input, so v4-mapped-v6
|
|
* are disallowed here when there is no sctp_sock.
|
|
*/
|
|
if (!sp || !sp->v4mapped)
|
|
return 0;
|
|
if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
|
|
return 0;
|
|
sctp_v6_map_v4(addr);
|
|
return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
|
|
}
|
|
|
|
/* Is this a non-unicast address */
|
|
if (!(ret & IPV6_ADDR_UNICAST))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* What is the scope of 'addr'? */
|
|
static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
|
|
{
|
|
int v6scope;
|
|
sctp_scope_t retval;
|
|
|
|
/* The IPv6 scope is really a set of bit fields.
|
|
* See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
|
|
*/
|
|
|
|
v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
|
|
switch (v6scope) {
|
|
case IFA_HOST:
|
|
retval = SCTP_SCOPE_LOOPBACK;
|
|
break;
|
|
case IFA_LINK:
|
|
retval = SCTP_SCOPE_LINK;
|
|
break;
|
|
case IFA_SITE:
|
|
retval = SCTP_SCOPE_PRIVATE;
|
|
break;
|
|
default:
|
|
retval = SCTP_SCOPE_GLOBAL;
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* Create and initialize a new sk for the socket to be returned by accept(). */
|
|
static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
|
|
struct sctp_association *asoc)
|
|
{
|
|
struct sock *newsk;
|
|
struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
|
|
struct sctp6_sock *newsctp6sk;
|
|
|
|
newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
|
|
if (!newsk)
|
|
goto out;
|
|
|
|
sock_init_data(NULL, newsk);
|
|
|
|
sctp_copy_sock(newsk, sk, asoc);
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
|
|
newsctp6sk = (struct sctp6_sock *)newsk;
|
|
inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
|
|
|
|
sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
|
|
|
|
newnp = inet6_sk(newsk);
|
|
|
|
memcpy(newnp, np, sizeof(struct ipv6_pinfo));
|
|
|
|
/* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
|
|
* and getpeername().
|
|
*/
|
|
sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
|
|
|
|
sk_refcnt_debug_inc(newsk);
|
|
|
|
if (newsk->sk_prot->init(newsk)) {
|
|
sk_common_release(newsk);
|
|
newsk = NULL;
|
|
}
|
|
|
|
out:
|
|
return newsk;
|
|
}
|
|
|
|
/* Map v4 address to mapped v6 address */
|
|
static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
|
|
{
|
|
if (sp->v4mapped && AF_INET == addr->sa.sa_family)
|
|
sctp_v4_map_v6(addr);
|
|
}
|
|
|
|
/* Where did this skb come from? */
|
|
static int sctp_v6_skb_iif(const struct sk_buff *skb)
|
|
{
|
|
struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
|
|
return opt->iif;
|
|
}
|
|
|
|
/* Was this packet marked by Explicit Congestion Notification? */
|
|
static int sctp_v6_is_ce(const struct sk_buff *skb)
|
|
{
|
|
return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
|
|
}
|
|
|
|
/* Dump the v6 addr to the seq file. */
|
|
static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
|
|
{
|
|
seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
|
|
}
|
|
|
|
static void sctp_v6_ecn_capable(struct sock *sk)
|
|
{
|
|
inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
|
|
}
|
|
|
|
/* Initialize a PF_INET6 socket msg_name. */
|
|
static void sctp_inet6_msgname(char *msgname, int *addr_len)
|
|
{
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
sin6 = (struct sockaddr_in6 *)msgname;
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_flowinfo = 0;
|
|
sin6->sin6_scope_id = 0; /*FIXME */
|
|
*addr_len = sizeof(struct sockaddr_in6);
|
|
}
|
|
|
|
/* Initialize a PF_INET msgname from a ulpevent. */
|
|
static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
|
|
char *msgname, int *addrlen)
|
|
{
|
|
struct sockaddr_in6 *sin6, *sin6from;
|
|
|
|
if (msgname) {
|
|
union sctp_addr *addr;
|
|
struct sctp_association *asoc;
|
|
|
|
asoc = event->asoc;
|
|
sctp_inet6_msgname(msgname, addrlen);
|
|
sin6 = (struct sockaddr_in6 *)msgname;
|
|
sin6->sin6_port = htons(asoc->peer.port);
|
|
addr = &asoc->peer.primary_addr;
|
|
|
|
/* Note: If we go to a common v6 format, this code
|
|
* will change.
|
|
*/
|
|
|
|
/* Map ipv4 address into v4-mapped-on-v6 address. */
|
|
if (sctp_sk(asoc->base.sk)->v4mapped &&
|
|
AF_INET == addr->sa.sa_family) {
|
|
sctp_v4_map_v6((union sctp_addr *)sin6);
|
|
sin6->sin6_addr.s6_addr32[3] =
|
|
addr->v4.sin_addr.s_addr;
|
|
return;
|
|
}
|
|
|
|
sin6from = &asoc->peer.primary_addr.v6;
|
|
sin6->sin6_addr = sin6from->sin6_addr;
|
|
if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
|
|
sin6->sin6_scope_id = sin6from->sin6_scope_id;
|
|
}
|
|
}
|
|
|
|
/* Initialize a msg_name from an inbound skb. */
|
|
static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
|
|
int *addr_len)
|
|
{
|
|
struct sctphdr *sh;
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
if (msgname) {
|
|
sctp_inet6_msgname(msgname, addr_len);
|
|
sin6 = (struct sockaddr_in6 *)msgname;
|
|
sh = sctp_hdr(skb);
|
|
sin6->sin6_port = sh->source;
|
|
|
|
/* Map ipv4 address into v4-mapped-on-v6 address. */
|
|
if (sctp_sk(skb->sk)->v4mapped &&
|
|
ip_hdr(skb)->version == 4) {
|
|
sctp_v4_map_v6((union sctp_addr *)sin6);
|
|
sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
|
|
return;
|
|
}
|
|
|
|
/* Otherwise, just copy the v6 address. */
|
|
sin6->sin6_addr = ipv6_hdr(skb)->saddr;
|
|
if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
|
|
struct sctp_ulpevent *ev = sctp_skb2event(skb);
|
|
sin6->sin6_scope_id = ev->iif;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Do we support this AF? */
|
|
static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
|
|
{
|
|
switch (family) {
|
|
case AF_INET6:
|
|
return 1;
|
|
/* v4-mapped-v6 addresses */
|
|
case AF_INET:
|
|
if (!__ipv6_only_sock(sctp_opt2sk(sp)))
|
|
return 1;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Address matching with wildcards allowed. This extra level
|
|
* of indirection lets us choose whether a PF_INET6 should
|
|
* disallow any v4 addresses if we so choose.
|
|
*/
|
|
static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
|
|
const union sctp_addr *addr2,
|
|
struct sctp_sock *opt)
|
|
{
|
|
struct sctp_af *af1, *af2;
|
|
struct sock *sk = sctp_opt2sk(opt);
|
|
|
|
af1 = sctp_get_af_specific(addr1->sa.sa_family);
|
|
af2 = sctp_get_af_specific(addr2->sa.sa_family);
|
|
|
|
if (!af1 || !af2)
|
|
return 0;
|
|
|
|
/* If the socket is IPv6 only, v4 addrs will not match */
|
|
if (__ipv6_only_sock(sk) && af1 != af2)
|
|
return 0;
|
|
|
|
/* Today, wildcard AF_INET/AF_INET6. */
|
|
if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
|
|
return 1;
|
|
|
|
if (addr1->sa.sa_family != addr2->sa.sa_family)
|
|
return 0;
|
|
|
|
return af1->cmp_addr(addr1, addr2);
|
|
}
|
|
|
|
/* Verify that the provided sockaddr looks bindable. Common verification,
|
|
* has already been taken care of.
|
|
*/
|
|
static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
|
|
{
|
|
struct sctp_af *af;
|
|
|
|
/* ASSERT: address family has already been verified. */
|
|
if (addr->sa.sa_family != AF_INET6)
|
|
af = sctp_get_af_specific(addr->sa.sa_family);
|
|
else {
|
|
int type = ipv6_addr_type(&addr->v6.sin6_addr);
|
|
struct net_device *dev;
|
|
|
|
if (type & IPV6_ADDR_LINKLOCAL) {
|
|
struct net *net;
|
|
if (!addr->v6.sin6_scope_id)
|
|
return 0;
|
|
net = sock_net(&opt->inet.sk);
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
|
|
if (!dev ||
|
|
!ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) {
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
} else if (type == IPV6_ADDR_MAPPED) {
|
|
if (!opt->v4mapped)
|
|
return 0;
|
|
}
|
|
|
|
af = opt->pf->af;
|
|
}
|
|
return af->available(addr, opt);
|
|
}
|
|
|
|
/* Verify that the provided sockaddr looks sendable. Common verification,
|
|
* has already been taken care of.
|
|
*/
|
|
static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
|
|
{
|
|
struct sctp_af *af = NULL;
|
|
|
|
/* ASSERT: address family has already been verified. */
|
|
if (addr->sa.sa_family != AF_INET6)
|
|
af = sctp_get_af_specific(addr->sa.sa_family);
|
|
else {
|
|
int type = ipv6_addr_type(&addr->v6.sin6_addr);
|
|
struct net_device *dev;
|
|
|
|
if (type & IPV6_ADDR_LINKLOCAL) {
|
|
if (!addr->v6.sin6_scope_id)
|
|
return 0;
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
|
|
addr->v6.sin6_scope_id);
|
|
rcu_read_unlock();
|
|
if (!dev)
|
|
return 0;
|
|
}
|
|
af = opt->pf->af;
|
|
}
|
|
|
|
return af != NULL;
|
|
}
|
|
|
|
/* Fill in Supported Address Type information for INIT and INIT-ACK
|
|
* chunks. Note: In the future, we may want to look at sock options
|
|
* to determine whether a PF_INET6 socket really wants to have IPV4
|
|
* addresses.
|
|
* Returns number of addresses supported.
|
|
*/
|
|
static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
|
|
__be16 *types)
|
|
{
|
|
types[0] = SCTP_PARAM_IPV6_ADDRESS;
|
|
if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
|
|
types[1] = SCTP_PARAM_IPV4_ADDRESS;
|
|
return 2;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static const struct proto_ops inet6_seqpacket_ops = {
|
|
.family = PF_INET6,
|
|
.owner = THIS_MODULE,
|
|
.release = inet6_release,
|
|
.bind = inet6_bind,
|
|
.connect = inet_dgram_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = inet_accept,
|
|
.getname = inet6_getname,
|
|
.poll = sctp_poll,
|
|
.ioctl = inet6_ioctl,
|
|
.listen = sctp_inet_listen,
|
|
.shutdown = inet_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = sock_common_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
static struct inet_protosw sctpv6_seqpacket_protosw = {
|
|
.type = SOCK_SEQPACKET,
|
|
.protocol = IPPROTO_SCTP,
|
|
.prot = &sctpv6_prot,
|
|
.ops = &inet6_seqpacket_ops,
|
|
.no_check = 0,
|
|
.flags = SCTP_PROTOSW_FLAG
|
|
};
|
|
static struct inet_protosw sctpv6_stream_protosw = {
|
|
.type = SOCK_STREAM,
|
|
.protocol = IPPROTO_SCTP,
|
|
.prot = &sctpv6_prot,
|
|
.ops = &inet6_seqpacket_ops,
|
|
.no_check = 0,
|
|
.flags = SCTP_PROTOSW_FLAG,
|
|
};
|
|
|
|
static int sctp6_rcv(struct sk_buff *skb)
|
|
{
|
|
return sctp_rcv(skb) ? -1 : 0;
|
|
}
|
|
|
|
static const struct inet6_protocol sctpv6_protocol = {
|
|
.handler = sctp6_rcv,
|
|
.err_handler = sctp_v6_err,
|
|
.flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
|
|
};
|
|
|
|
static struct sctp_af sctp_af_inet6 = {
|
|
.sa_family = AF_INET6,
|
|
.sctp_xmit = sctp_v6_xmit,
|
|
.setsockopt = ipv6_setsockopt,
|
|
.getsockopt = ipv6_getsockopt,
|
|
.get_dst = sctp_v6_get_dst,
|
|
.get_saddr = sctp_v6_get_saddr,
|
|
.copy_addrlist = sctp_v6_copy_addrlist,
|
|
.from_skb = sctp_v6_from_skb,
|
|
.from_sk = sctp_v6_from_sk,
|
|
.to_sk_saddr = sctp_v6_to_sk_saddr,
|
|
.to_sk_daddr = sctp_v6_to_sk_daddr,
|
|
.from_addr_param = sctp_v6_from_addr_param,
|
|
.to_addr_param = sctp_v6_to_addr_param,
|
|
.cmp_addr = sctp_v6_cmp_addr,
|
|
.scope = sctp_v6_scope,
|
|
.addr_valid = sctp_v6_addr_valid,
|
|
.inaddr_any = sctp_v6_inaddr_any,
|
|
.is_any = sctp_v6_is_any,
|
|
.available = sctp_v6_available,
|
|
.skb_iif = sctp_v6_skb_iif,
|
|
.is_ce = sctp_v6_is_ce,
|
|
.seq_dump_addr = sctp_v6_seq_dump_addr,
|
|
.ecn_capable = sctp_v6_ecn_capable,
|
|
.net_header_len = sizeof(struct ipv6hdr),
|
|
.sockaddr_len = sizeof(struct sockaddr_in6),
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_ipv6_setsockopt,
|
|
.compat_getsockopt = compat_ipv6_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
static struct sctp_pf sctp_pf_inet6 = {
|
|
.event_msgname = sctp_inet6_event_msgname,
|
|
.skb_msgname = sctp_inet6_skb_msgname,
|
|
.af_supported = sctp_inet6_af_supported,
|
|
.cmp_addr = sctp_inet6_cmp_addr,
|
|
.bind_verify = sctp_inet6_bind_verify,
|
|
.send_verify = sctp_inet6_send_verify,
|
|
.supported_addrs = sctp_inet6_supported_addrs,
|
|
.create_accept_sk = sctp_v6_create_accept_sk,
|
|
.addr_v4map = sctp_v6_addr_v4map,
|
|
.af = &sctp_af_inet6,
|
|
};
|
|
|
|
/* Initialize IPv6 support and register with socket layer. */
|
|
void sctp_v6_pf_init(void)
|
|
{
|
|
/* Register the SCTP specific PF_INET6 functions. */
|
|
sctp_register_pf(&sctp_pf_inet6, PF_INET6);
|
|
|
|
/* Register the SCTP specific AF_INET6 functions. */
|
|
sctp_register_af(&sctp_af_inet6);
|
|
}
|
|
|
|
void sctp_v6_pf_exit(void)
|
|
{
|
|
list_del(&sctp_af_inet6.list);
|
|
}
|
|
|
|
/* Initialize IPv6 support and register with socket layer. */
|
|
int sctp_v6_protosw_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = proto_register(&sctpv6_prot, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
|
|
inet6_register_protosw(&sctpv6_seqpacket_protosw);
|
|
inet6_register_protosw(&sctpv6_stream_protosw);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void sctp_v6_protosw_exit(void)
|
|
{
|
|
inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
|
|
inet6_unregister_protosw(&sctpv6_stream_protosw);
|
|
proto_unregister(&sctpv6_prot);
|
|
}
|
|
|
|
|
|
/* Register with inet6 layer. */
|
|
int sctp_v6_add_protocol(void)
|
|
{
|
|
/* Register notifier for inet6 address additions/deletions. */
|
|
register_inet6addr_notifier(&sctp_inet6addr_notifier);
|
|
|
|
if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Unregister with inet6 layer. */
|
|
void sctp_v6_del_protocol(void)
|
|
{
|
|
inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
|
|
unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
|
|
}
|