/*
* DCCP over IPv6
* Linux INET6 implementation
*
* Based on net/dccp6/ipv6.c
*
* Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/xfrm.h>
#include <net/addrconf.h>
#include <net/inet_common.h>
#include <net/inet_hashtables.h>
#include <net/inet_sock.h>
#include <net/inet6_connection_sock.h>
#include <net/inet6_hashtables.h>
#include <net/ip6_route.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/ip6_checksum.h>
#include <net/xfrm.h>
#include "dccp.h"
#include "ipv6.h"
static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
struct request_sock *req);
static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
{
return inet_csk_get_port(&dccp_hashinfo, sk, snum,
inet6_csk_bind_conflict);
}
static void dccp_v6_hash(struct sock *sk)
{
if (sk->sk_state != DCCP_CLOSED) {
if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
dccp_prot.hash(sk);
return;
}
local_bh_disable();
__inet6_hash(&dccp_hashinfo, sk);
local_bh_enable();
}
}
static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
struct in6_addr *saddr,
struct in6_addr *daddr,
unsigned long base)
{
return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
}
static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
{
const struct dccp_hdr *dh = dccp_hdr(skb);
if (skb->protocol == htons(ETH_P_IPV6))
return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
skb->nh.ipv6h->saddr.s6_addr32,
dh->dccph_dport,
dh->dccph_sport);
else
return secure_dccp_sequence_number(skb->nh.iph->daddr,
skb->nh.iph->saddr,
dh->dccph_dport,
dh->dccph_sport);
}
static int dccp_v6_connect