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1217 lines
32 KiB
1217 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* 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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* Please send any bug reports or fixes you make to the |
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* email address(es): |
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* lksctp developers <[email protected]> |
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* |
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* Written or modified by: |
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* Le Yanqun <[email protected]> |
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* Hui Huang <[email protected]> |
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* La Monte H.P. Yarroll <[email protected]> |
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* Sridhar Samudrala <[email protected]> |
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* Jon Grimm <[email protected]> |
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* Ardelle Fan <[email protected]> |
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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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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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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|
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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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|
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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 <net/udp_tunnel.h> |
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|
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#include <linux/uaccess.h> |
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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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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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|
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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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|
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switch (ev) { |
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case NETDEV_UP: |
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addr = kzalloc(sizeof(*addr), 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_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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addr->a.v6.sin6_scope_id == ifa->idev->dev->ifindex) { |
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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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|
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return NOTIFY_DONE; |
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} |
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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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|
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static void sctp_v6_err_handle(struct sctp_transport *t, struct sk_buff *skb, |
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__u8 type, __u8 code, __u32 info) |
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{ |
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struct sctp_association *asoc = t->asoc; |
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struct sock *sk = asoc->base.sk; |
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struct ipv6_pinfo *np; |
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int err = 0; |
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|
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switch (type) { |
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case ICMPV6_PKT_TOOBIG: |
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if (ip6_sk_accept_pmtu(sk)) |
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sctp_icmp_frag_needed(sk, asoc, t, info); |
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return; |
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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, t); |
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return; |
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} |
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break; |
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case NDISC_REDIRECT: |
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sctp_icmp_redirect(sk, t, skb); |
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return; |
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default: |
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break; |
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} |
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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_error_report(sk); |
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} else { |
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sk->sk_err_soft = err; |
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} |
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} |
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|
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/* ICMP error handler. */ |
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static int 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 net *net = dev_net(skb->dev); |
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struct sctp_transport *transport; |
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struct sctp_association *asoc; |
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__u16 saveip, savesctp; |
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struct sock *sk; |
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|
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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(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
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return -ENOENT; |
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} |
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|
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sctp_v6_err_handle(transport, skb, type, code, ntohl(info)); |
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sctp_err_finish(sk, transport); |
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|
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return 0; |
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} |
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|
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int sctp_udp_v6_err(struct sock *sk, struct sk_buff *skb) |
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{ |
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struct net *net = dev_net(skb->dev); |
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struct sctp_association *asoc; |
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struct sctp_transport *t; |
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struct icmp6hdr *hdr; |
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__u32 info = 0; |
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|
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skb->transport_header += sizeof(struct udphdr); |
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sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &t); |
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if (!sk) { |
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__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
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return -ENOENT; |
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} |
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|
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skb->transport_header -= sizeof(struct udphdr); |
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hdr = (struct icmp6hdr *)(skb_network_header(skb) - sizeof(struct icmp6hdr)); |
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if (hdr->icmp6_type == NDISC_REDIRECT) { |
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/* can't be handled without outer ip6hdr known, leave it to udpv6_err */ |
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sctp_err_finish(sk, t); |
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return 0; |
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} |
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if (hdr->icmp6_type == ICMPV6_PKT_TOOBIG) |
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info = ntohl(hdr->icmp6_mtu); |
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sctp_v6_err_handle(t, skb, hdr->icmp6_type, hdr->icmp6_code, info); |
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|
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sctp_err_finish(sk, t); |
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return 1; |
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} |
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|
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static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t) |
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{ |
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struct dst_entry *dst = dst_clone(t->dst); |
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struct flowi6 *fl6 = &t->fl.u.ip6; |
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struct sock *sk = skb->sk; |
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struct ipv6_pinfo *np = inet6_sk(sk); |
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__u8 tclass = np->tclass; |
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__be32 label; |
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|
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pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb, |
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skb->len, &fl6->saddr, &fl6->daddr); |
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|
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if (t->dscp & SCTP_DSCP_SET_MASK) |
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tclass = t->dscp & SCTP_DSCP_VAL_MASK; |
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|
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if (INET_ECN_is_capable(tclass)) |
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IP6_ECN_flow_xmit(sk, fl6->flowlabel); |
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|
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if (!(t->param_flags & SPP_PMTUD_ENABLE)) |
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skb->ignore_df = 1; |
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|
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SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); |
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|
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if (!t->encap_port || !sctp_sk(sk)->udp_port) { |
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int res; |
|
|
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skb_dst_set(skb, dst); |
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rcu_read_lock(); |
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res = ip6_xmit(sk, skb, fl6, sk->sk_mark, |
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rcu_dereference(np->opt), |
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tclass, sk->sk_priority); |
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rcu_read_unlock(); |
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return res; |
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} |
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|
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if (skb_is_gso(skb)) |
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skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; |
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|
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skb->encapsulation = 1; |
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skb_reset_inner_mac_header(skb); |
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skb_reset_inner_transport_header(skb); |
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skb_set_inner_ipproto(skb, IPPROTO_SCTP); |
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label = ip6_make_flowlabel(sock_net(sk), skb, fl6->flowlabel, true, fl6); |
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|
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return udp_tunnel6_xmit_skb(dst, sk, skb, NULL, &fl6->saddr, |
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&fl6->daddr, tclass, ip6_dst_hoplimit(dst), |
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label, sctp_sk(sk)->udp_port, t->encap_port, false); |
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} |
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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 flowi _fl; |
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struct flowi6 *fl6 = &_fl.u.ip6; |
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struct sctp_bind_addr *bp; |
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struct ipv6_pinfo *np = inet6_sk(sk); |
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struct sctp_sockaddr_entry *laddr; |
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union sctp_addr *daddr = &t->ipaddr; |
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union sctp_addr dst_saddr; |
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struct in6_addr *final_p, final; |
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enum sctp_scope scope; |
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__u8 matchlen = 0; |
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|
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memset(&_fl, 0, sizeof(_fl)); |
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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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else if (asoc) |
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fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if; |
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if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK) |
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fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK); |
|
|
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if (np->sndflow && (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) { |
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struct ip6_flowlabel *flowlabel; |
|
|
|
flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); |
|
if (IS_ERR(flowlabel)) |
|
goto out; |
|
fl6_sock_release(flowlabel); |
|
} |
|
|
|
pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr); |
|
|
|
if (asoc) |
|
fl6->fl6_sport = htons(asoc->base.bind_addr.port); |
|
|
|
if (saddr) { |
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fl6->saddr = saddr->v6.sin6_addr; |
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if (!fl6->fl6_sport) |
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fl6->fl6_sport = saddr->v6.sin6_port; |
|
|
|
pr_debug("src=%pI6 - ", &fl6->saddr); |
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} |
|
|
|
rcu_read_lock(); |
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final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); |
|
rcu_read_unlock(); |
|
|
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dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p); |
|
if (!asoc || saddr) { |
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t->dst = dst; |
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memcpy(fl, &_fl, sizeof(_fl)); |
|
goto out; |
|
} |
|
|
|
bp = &asoc->base.bind_addr; |
|
scope = sctp_scope(daddr); |
|
/* ip6_dst_lookup has filled in the fl6->saddr for us. Check |
|
* to see if we can use it. |
|
*/ |
|
if (!IS_ERR(dst)) { |
|
/* Walk through the bind address list and look for a bind |
|
* address that matches the source address of the returned dst. |
|
*/ |
|
sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port)); |
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
|
if (!laddr->valid || laddr->state == SCTP_ADDR_DEL || |
|
(laddr->state != SCTP_ADDR_SRC && |
|
!asoc->src_out_of_asoc_ok)) |
|
continue; |
|
|
|
/* Do not compare against v4 addrs */ |
|
if ((laddr->a.sa.sa_family == AF_INET6) && |
|
(sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) { |
|
rcu_read_unlock(); |
|
t->dst = dst; |
|
memcpy(fl, &_fl, sizeof(_fl)); |
|
goto out; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
/* None of the bound addresses match the source address of the |
|
* dst. So release it. |
|
*/ |
|
dst_release(dst); |
|
dst = NULL; |
|
} |
|
|
|
/* Walk through the bind address list and try to get the |
|
* best source address for a given destination. |
|
*/ |
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
|
struct dst_entry *bdst; |
|
__u8 bmatchlen; |
|
|
|
if (!laddr->valid || |
|
laddr->state != SCTP_ADDR_SRC || |
|
laddr->a.sa.sa_family != AF_INET6 || |
|
scope > sctp_scope(&laddr->a)) |
|
continue; |
|
|
|
fl6->saddr = laddr->a.v6.sin6_addr; |
|
fl6->fl6_sport = laddr->a.v6.sin6_port; |
|
final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); |
|
bdst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p); |
|
|
|
if (IS_ERR(bdst)) |
|
continue; |
|
|
|
if (ipv6_chk_addr(dev_net(bdst->dev), |
|
&laddr->a.v6.sin6_addr, bdst->dev, 1)) { |
|
if (!IS_ERR_OR_NULL(dst)) |
|
dst_release(dst); |
|
dst = bdst; |
|
t->dst = dst; |
|
memcpy(fl, &_fl, sizeof(_fl)); |
|
break; |
|
} |
|
|
|
bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); |
|
if (matchlen > bmatchlen) { |
|
dst_release(bdst); |
|
continue; |
|
} |
|
|
|
if (!IS_ERR_OR_NULL(dst)) |
|
dst_release(dst); |
|
dst = bdst; |
|
matchlen = bmatchlen; |
|
t->dst = dst; |
|
memcpy(fl, &_fl, sizeof(_fl)); |
|
} |
|
rcu_read_unlock(); |
|
|
|
out: |
|
if (!IS_ERR_OR_NULL(dst)) { |
|
struct rt6_info *rt; |
|
|
|
rt = (struct rt6_info *)dst; |
|
t->dst_cookie = rt6_get_cookie(rt); |
|
pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n", |
|
&rt->rt6i_dst.addr, rt->rt6i_dst.plen, |
|
&fl->u.ip6.saddr); |
|
} else { |
|
t->dst = NULL; |
|
pr_debug("no route\n"); |
|
} |
|
} |
|
|
|
/* Returns the number of consecutive initial bits that match in the 2 ipv6 |
|
* addresses. |
|
*/ |
|
static inline int sctp_v6_addr_match_len(union sctp_addr *s1, |
|
union sctp_addr *s2) |
|
{ |
|
return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr); |
|
} |
|
|
|
/* Fills in the source address(saddr) based on the destination address(daddr) |
|
* and asoc's bind address list. |
|
*/ |
|
static void sctp_v6_get_saddr(struct sctp_sock *sk, |
|
struct sctp_transport *t, |
|
struct flowi *fl) |
|
{ |
|
struct flowi6 *fl6 = &fl->u.ip6; |
|
union sctp_addr *saddr = &t->saddr; |
|
|
|
pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst); |
|
|
|
if (t->dst) { |
|
saddr->v6.sin6_family = AF_INET6; |
|
saddr->v6.sin6_addr = fl6->saddr; |
|
} |
|
} |
|
|
|
/* Make a copy of all potential local addresses. */ |
|
static void sctp_v6_copy_addrlist(struct list_head *addrlist, |
|
struct net_device *dev) |
|
{ |
|
struct inet6_dev *in6_dev; |
|
struct inet6_ifaddr *ifp; |
|
struct sctp_sockaddr_entry *addr; |
|
|
|
rcu_read_lock(); |
|
if ((in6_dev = __in6_dev_get(dev)) == NULL) { |
|
rcu_read_unlock(); |
|
return; |
|
} |
|
|
|
read_lock_bh(&in6_dev->lock); |
|
list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { |
|
/* Add the address to the local list. */ |
|
addr = kzalloc(sizeof(*addr), GFP_ATOMIC); |
|
if (addr) { |
|
addr->a.v6.sin6_family = AF_INET6; |
|
addr->a.v6.sin6_addr = ifp->addr; |
|
addr->a.v6.sin6_scope_id = dev->ifindex; |
|
addr->valid = 1; |
|
INIT_LIST_HEAD(&addr->list); |
|
list_add_tail(&addr->list, addrlist); |
|
} |
|
} |
|
|
|
read_unlock_bh(&in6_dev->lock); |
|
rcu_read_unlock(); |
|
} |
|
|
|
/* Copy over any ip options */ |
|
static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk) |
|
{ |
|
struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
|
struct ipv6_txoptions *opt; |
|
|
|
newnp = inet6_sk(newsk); |
|
|
|
rcu_read_lock(); |
|
opt = rcu_dereference(np->opt); |
|
if (opt) { |
|
opt = ipv6_dup_options(newsk, opt); |
|
if (!opt) |
|
pr_err("%s: Failed to copy ip options\n", __func__); |
|
} |
|
RCU_INIT_POINTER(newnp->opt, opt); |
|
rcu_read_unlock(); |
|
} |
|
|
|
/* Account for the IP options */ |
|
static int sctp_v6_ip_options_len(struct sock *sk) |
|
{ |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct ipv6_txoptions *opt; |
|
int len = 0; |
|
|
|
rcu_read_lock(); |
|
opt = rcu_dereference(np->opt); |
|
if (opt) |
|
len = opt->opt_flen + opt->opt_nflen; |
|
|
|
rcu_read_unlock(); |
|
return len; |
|
} |
|
|
|
/* Initialize a sockaddr_storage from in incoming skb. */ |
|
static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb, |
|
int is_saddr) |
|
{ |
|
/* Always called on head skb, so this is safe */ |
|
struct sctphdr *sh = sctp_hdr(skb); |
|
struct sockaddr_in6 *sa = &addr->v6; |
|
|
|
addr->v6.sin6_family = AF_INET6; |
|
addr->v6.sin6_flowinfo = 0; /* FIXME */ |
|
addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; |
|
|
|
if (is_saddr) { |
|
sa->sin6_port = sh->source; |
|
sa->sin6_addr = ipv6_hdr(skb)->saddr; |
|
} else { |
|
sa->sin6_port = sh->dest; |
|
sa->sin6_addr = ipv6_hdr(skb)->daddr; |
|
} |
|
} |
|
|
|
/* Initialize an sctp_addr from a socket. */ |
|
static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) |
|
{ |
|
addr->v6.sin6_family = AF_INET6; |
|
addr->v6.sin6_port = 0; |
|
addr->v6.sin6_addr = sk->sk_v6_rcv_saddr; |
|
} |
|
|
|
/* 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) { |
|
sk->sk_v6_rcv_saddr.s6_addr32[0] = 0; |
|
sk->sk_v6_rcv_saddr.s6_addr32[1] = 0; |
|
sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); |
|
sk->sk_v6_rcv_saddr.s6_addr32[3] = |
|
addr->v4.sin_addr.s_addr; |
|
} else { |
|
sk->sk_v6_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) { |
|
sk->sk_v6_daddr.s6_addr32[0] = 0; |
|
sk->sk_v6_daddr.s6_addr32[1] = 0; |
|
sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff); |
|
sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; |
|
} else { |
|
sk->sk_v6_daddr = addr->v6.sin6_addr; |
|
} |
|
} |
|
|
|
/* Initialize a sctp_addr from an address parameter. */ |
|
static bool sctp_v6_from_addr_param(union sctp_addr *addr, |
|
union sctp_addr_param *param, |
|
__be16 port, int iif) |
|
{ |
|
if (ntohs(param->v6.param_hdr.length) < sizeof(struct sctp_ipv6addr_param)) |
|
return false; |
|
|
|
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; |
|
|
|
return true; |
|
} |
|
|
|
/* 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(struct sctp_ipv6addr_param); |
|
|
|
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_flowinfo = 0; |
|
addr->v6.sin6_addr = *saddr; |
|
addr->v6.sin6_scope_id = 0; |
|
} |
|
|
|
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) && |
|
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) && |
|
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) && |
|
addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && |
|
addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id) |
|
return 0; |
|
|
|
return 1; |
|
} |
|
|
|
/* 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) |
|
{ |
|
return __sctp_v6_cmp_addr(addr1, addr2) && |
|
addr1->v6.sin6_port == addr2->v6.sin6_port; |
|
} |
|
|
|
/* 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; |
|
struct net *net = sock_net(&sp->inet.sk); |
|
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 && 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_can_nonlocal_bind(net, &sp->inet) || |
|
ipv6_chk_addr(net, 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 && 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 enum sctp_scope sctp_v6_scope(union sctp_addr *addr) |
|
{ |
|
enum sctp_scope retval; |
|
int v6scope; |
|
|
|
/* 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, |
|
bool kern) |
|
{ |
|
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, kern); |
|
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)); |
|
newnp->ipv6_mc_list = NULL; |
|
newnp->ipv6_ac_list = NULL; |
|
newnp->ipv6_fl_list = NULL; |
|
|
|
sctp_v6_copy_ip_options(sk, newsk); |
|
|
|
/* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() |
|
* and getpeername(). |
|
*/ |
|
sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); |
|
|
|
newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr; |
|
|
|
sk_refcnt_debug_inc(newsk); |
|
|
|
if (newsk->sk_prot->init(newsk)) { |
|
sk_common_release(newsk); |
|
newsk = NULL; |
|
} |
|
|
|
out: |
|
return newsk; |
|
} |
|
|
|
/* Format a sockaddr for return to user space. This makes sure the return is |
|
* AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option. |
|
*/ |
|
static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) |
|
{ |
|
if (sp->v4mapped) { |
|
if (addr->sa.sa_family == AF_INET) |
|
sctp_v4_map_v6(addr); |
|
} else { |
|
if (addr->sa.sa_family == AF_INET6 && |
|
ipv6_addr_v4mapped(&addr->v6.sin6_addr)) |
|
sctp_v6_map_v4(addr); |
|
} |
|
|
|
if (addr->sa.sa_family == AF_INET) { |
|
memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); |
|
return sizeof(struct sockaddr_in); |
|
} |
|
return sizeof(struct sockaddr_in6); |
|
} |
|
|
|
/* Where did this skb come from? */ |
|
static int sctp_v6_skb_iif(const struct sk_buff *skb) |
|
{ |
|
return IP6CB(skb)->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))) & (__force __u32)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_INET msgname from a ulpevent. */ |
|
static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, |
|
char *msgname, int *addrlen) |
|
{ |
|
union sctp_addr *addr; |
|
struct sctp_association *asoc; |
|
union sctp_addr *paddr; |
|
|
|
if (!msgname) |
|
return; |
|
|
|
addr = (union sctp_addr *)msgname; |
|
asoc = event->asoc; |
|
paddr = &asoc->peer.primary_addr; |
|
|
|
if (paddr->sa.sa_family == AF_INET) { |
|
addr->v4.sin_family = AF_INET; |
|
addr->v4.sin_port = htons(asoc->peer.port); |
|
addr->v4.sin_addr = paddr->v4.sin_addr; |
|
} else { |
|
addr->v6.sin6_family = AF_INET6; |
|
addr->v6.sin6_flowinfo = 0; |
|
if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
|
addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id; |
|
else |
|
addr->v6.sin6_scope_id = 0; |
|
addr->v6.sin6_port = htons(asoc->peer.port); |
|
addr->v6.sin6_addr = paddr->v6.sin6_addr; |
|
} |
|
|
|
*addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr); |
|
} |
|
|
|
/* Initialize a msg_name from an inbound skb. */ |
|
static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, |
|
int *addr_len) |
|
{ |
|
union sctp_addr *addr; |
|
struct sctphdr *sh; |
|
|
|
if (!msgname) |
|
return; |
|
|
|
addr = (union sctp_addr *)msgname; |
|
sh = sctp_hdr(skb); |
|
|
|
if (ip_hdr(skb)->version == 4) { |
|
addr->v4.sin_family = AF_INET; |
|
addr->v4.sin_port = sh->source; |
|
addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr; |
|
} else { |
|
addr->v6.sin6_family = AF_INET6; |
|
addr->v6.sin6_flowinfo = 0; |
|
addr->v6.sin6_port = sh->source; |
|
addr->v6.sin6_addr = ipv6_hdr(skb)->saddr; |
|
if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
|
addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb); |
|
else |
|
addr->v6.sin6_scope_id = 0; |
|
} |
|
|
|
*addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr); |
|
} |
|
|
|
/* 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; |
|
fallthrough; |
|
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 sock *sk = sctp_opt2sk(opt); |
|
struct sctp_af *af1, *af2; |
|
|
|
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 == AF_INET && addr2->sa.sa_family == AF_INET) |
|
return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr; |
|
|
|
return __sctp_v6_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_can_nonlocal_bind(net, &opt->inet) || |
|
ipv6_chk_addr(net, &addr->v6.sin6_addr, |
|
dev, 0))) { |
|
rcu_read_unlock(); |
|
return 0; |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
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; |
|
} |
|
|
|
/* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */ |
|
static int sctp_getname(struct socket *sock, struct sockaddr *uaddr, |
|
int peer) |
|
{ |
|
int rc; |
|
|
|
rc = inet6_getname(sock, uaddr, peer); |
|
|
|
if (rc < 0) |
|
return rc; |
|
|
|
rc = sctp_v6_addr_to_user(sctp_sk(sock->sk), |
|
(union sctp_addr *)uaddr); |
|
|
|
return rc; |
|
} |
|
|
|
static const struct proto_ops inet6_seqpacket_ops = { |
|
.family = PF_INET6, |
|
.owner = THIS_MODULE, |
|
.release = inet6_release, |
|
.bind = inet6_bind, |
|
.connect = sctp_inet_connect, |
|
.socketpair = sock_no_socketpair, |
|
.accept = inet_accept, |
|
.getname = sctp_getname, |
|
.poll = sctp_poll, |
|
.ioctl = inet6_ioctl, |
|
.gettstamp = sock_gettstamp, |
|
.listen = sctp_inet_listen, |
|
.shutdown = inet_shutdown, |
|
.setsockopt = sock_common_setsockopt, |
|
.getsockopt = sock_common_getsockopt, |
|
.sendmsg = inet_sendmsg, |
|
.recvmsg = inet_recvmsg, |
|
.mmap = sock_no_mmap, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = inet6_compat_ioctl, |
|
#endif |
|
}; |
|
|
|
static struct inet_protosw sctpv6_seqpacket_protosw = { |
|
.type = SOCK_SEQPACKET, |
|
.protocol = IPPROTO_SCTP, |
|
.prot = &sctpv6_prot, |
|
.ops = &inet6_seqpacket_ops, |
|
.flags = SCTP_PROTOSW_FLAG |
|
}; |
|
static struct inet_protosw sctpv6_stream_protosw = { |
|
.type = SOCK_STREAM, |
|
.protocol = IPPROTO_SCTP, |
|
.prot = &sctpv6_prot, |
|
.ops = &inet6_seqpacket_ops, |
|
.flags = SCTP_PROTOSW_FLAG, |
|
}; |
|
|
|
static int sctp6_rcv(struct sk_buff *skb) |
|
{ |
|
SCTP_INPUT_CB(skb)->encap_port = 0; |
|
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, |
|
.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), |
|
.ip_options_len = sctp_v6_ip_options_len, |
|
}; |
|
|
|
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_to_user = sctp_v6_addr_to_user, |
|
.to_sk_saddr = sctp_v6_to_sk_saddr, |
|
.to_sk_daddr = sctp_v6_to_sk_daddr, |
|
.copy_ip_options = sctp_v6_copy_ip_options, |
|
.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); |
|
}
|
|
|