1264 строки
32 KiB
C
1264 строки
32 KiB
C
/*
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* DCCP over IPv6
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* Linux INET6 implementation
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*
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* Based on net/dccp6/ipv6.c
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*
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* Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/xfrm.h>
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#include <net/addrconf.h>
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#include <net/inet_common.h>
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#include <net/inet_hashtables.h>
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#include <net/inet_sock.h>
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#include <net/inet6_connection_sock.h>
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#include <net/inet6_hashtables.h>
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#include <net/ip6_route.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/transp_v6.h>
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#include <net/ip6_checksum.h>
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#include <net/xfrm.h>
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#include "dccp.h"
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#include "ipv6.h"
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static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
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static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
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struct request_sock *req);
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static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
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static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
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static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
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static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
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static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
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{
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return inet_csk_get_port(&dccp_hashinfo, sk, snum,
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inet6_csk_bind_conflict);
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}
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static void dccp_v6_hash(struct sock *sk)
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{
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if (sk->sk_state != DCCP_CLOSED) {
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if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
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dccp_prot.hash(sk);
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return;
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}
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local_bh_disable();
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__inet6_hash(&dccp_hashinfo, sk);
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local_bh_enable();
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}
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}
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static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
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struct in6_addr *saddr,
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struct in6_addr *daddr,
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unsigned long base)
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{
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return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
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}
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static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
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{
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const struct dccp_hdr *dh = dccp_hdr(skb);
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if (skb->protocol == htons(ETH_P_IPV6))
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return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
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skb->nh.ipv6h->saddr.s6_addr32,
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dh->dccph_dport,
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dh->dccph_sport);
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else
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return secure_dccp_sequence_number(skb->nh.iph->daddr,
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skb->nh.iph->saddr,
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dh->dccph_dport,
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dh->dccph_sport);
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}
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static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
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int addr_len)
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{
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struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct dccp_sock *dp = dccp_sk(sk);
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struct in6_addr *saddr = NULL, *final_p = NULL, final;
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struct flowi fl;
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struct dst_entry *dst;
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int addr_type;
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int err;
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dp->dccps_role = DCCP_ROLE_CLIENT;
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if (addr_len < SIN6_LEN_RFC2133)
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return -EINVAL;
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if (usin->sin6_family != AF_INET6)
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return -EAFNOSUPPORT;
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memset(&fl, 0, sizeof(fl));
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if (np->sndflow) {
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fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
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IP6_ECN_flow_init(fl.fl6_flowlabel);
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if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
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struct ip6_flowlabel *flowlabel;
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flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
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if (flowlabel == NULL)
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return -EINVAL;
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ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
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fl6_sock_release(flowlabel);
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}
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}
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/*
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* connect() to INADDR_ANY means loopback (BSD'ism).
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*/
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if (ipv6_addr_any(&usin->sin6_addr))
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usin->sin6_addr.s6_addr[15] = 0x1;
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addr_type = ipv6_addr_type(&usin->sin6_addr);
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if(addr_type & IPV6_ADDR_MULTICAST)
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return -ENETUNREACH;
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if (addr_type & IPV6_ADDR_LINKLOCAL) {
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if (addr_len >= sizeof(struct sockaddr_in6) &&
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usin->sin6_scope_id) {
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/* If interface is set while binding, indices
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* must coincide.
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*/
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if (sk->sk_bound_dev_if &&
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sk->sk_bound_dev_if != usin->sin6_scope_id)
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return -EINVAL;
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sk->sk_bound_dev_if = usin->sin6_scope_id;
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}
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/* Connect to link-local address requires an interface */
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if (!sk->sk_bound_dev_if)
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return -EINVAL;
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}
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ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
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np->flow_label = fl.fl6_flowlabel;
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/*
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* DCCP over IPv4
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*/
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if (addr_type == IPV6_ADDR_MAPPED) {
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u32 exthdrlen = icsk->icsk_ext_hdr_len;
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struct sockaddr_in sin;
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SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
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if (__ipv6_only_sock(sk))
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return -ENETUNREACH;
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sin.sin_family = AF_INET;
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sin.sin_port = usin->sin6_port;
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sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
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icsk->icsk_af_ops = &dccp_ipv6_mapped;
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sk->sk_backlog_rcv = dccp_v4_do_rcv;
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err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
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if (err) {
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icsk->icsk_ext_hdr_len = exthdrlen;
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icsk->icsk_af_ops = &dccp_ipv6_af_ops;
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sk->sk_backlog_rcv = dccp_v6_do_rcv;
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goto failure;
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} else {
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ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
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inet->saddr);
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ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
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inet->rcv_saddr);
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}
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return err;
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}
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if (!ipv6_addr_any(&np->rcv_saddr))
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saddr = &np->rcv_saddr;
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fl.proto = IPPROTO_DCCP;
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ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
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ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
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fl.oif = sk->sk_bound_dev_if;
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fl.fl_ip_dport = usin->sin6_port;
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fl.fl_ip_sport = inet->sport;
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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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ipv6_addr_copy(&final, &fl.fl6_dst);
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ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
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final_p = &final;
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}
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err = ip6_dst_lookup(sk, &dst, &fl);
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if (err)
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goto failure;
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if (final_p)
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ipv6_addr_copy(&fl.fl6_dst, final_p);
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if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
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goto failure;
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if (saddr == NULL) {
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saddr = &fl.fl6_src;
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ipv6_addr_copy(&np->rcv_saddr, saddr);
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}
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/* set the source address */
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ipv6_addr_copy(&np->saddr, saddr);
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inet->rcv_saddr = LOOPBACK4_IPV6;
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ip6_dst_store(sk, dst, NULL);
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icsk->icsk_ext_hdr_len = 0;
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if (np->opt)
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icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
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np->opt->opt_nflen);
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inet->dport = usin->sin6_port;
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dccp_set_state(sk, DCCP_REQUESTING);
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err = inet6_hash_connect(&dccp_death_row, sk);
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if (err)
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goto late_failure;
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/* FIXME */
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#if 0
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dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
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np->daddr.s6_addr32,
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inet->sport,
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inet->dport);
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#endif
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err = dccp_connect(sk);
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if (err)
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goto late_failure;
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return 0;
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late_failure:
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dccp_set_state(sk, DCCP_CLOSED);
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__sk_dst_reset(sk);
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failure:
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inet->dport = 0;
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sk->sk_route_caps = 0;
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return err;
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}
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static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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int type, int code, int offset, __u32 info)
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{
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struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
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const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
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struct ipv6_pinfo *np;
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struct sock *sk;
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int err;
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__u64 seq;
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sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
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&hdr->saddr, dh->dccph_sport, skb->dev->ifindex);
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if (sk == NULL) {
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ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
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return;
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}
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if (sk->sk_state == DCCP_TIME_WAIT) {
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inet_twsk_put((struct inet_timewait_sock *)sk);
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return;
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}
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bh_lock_sock(sk);
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if (sock_owned_by_user(sk))
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NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
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if (sk->sk_state == DCCP_CLOSED)
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goto out;
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np = inet6_sk(sk);
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if (type == ICMPV6_PKT_TOOBIG) {
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struct dst_entry *dst = NULL;
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if (sock_owned_by_user(sk))
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goto out;
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if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
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goto out;
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/* icmp should have updated the destination cache entry */
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dst = __sk_dst_check(sk, np->dst_cookie);
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if (dst == NULL) {
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struct inet_sock *inet = inet_sk(sk);
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struct flowi fl;
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/* BUGGG_FUTURE: Again, it is not clear how
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to handle rthdr case. Ignore this complexity
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for now.
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*/
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memset(&fl, 0, sizeof(fl));
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fl.proto = IPPROTO_DCCP;
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ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
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ipv6_addr_copy(&fl.fl6_src, &np->saddr);
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fl.oif = sk->sk_bound_dev_if;
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fl.fl_ip_dport = inet->dport;
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fl.fl_ip_sport = inet->sport;
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if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
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sk->sk_err_soft = -err;
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goto out;
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}
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if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
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sk->sk_err_soft = -err;
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goto out;
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}
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} else
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dst_hold(dst);
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if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
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dccp_sync_mss(sk, dst_mtu(dst));
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} /* else let the usual retransmit timer handle it */
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dst_release(dst);
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goto out;
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}
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icmpv6_err_convert(type, code, &err);
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seq = DCCP_SKB_CB(skb)->dccpd_seq;
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/* Might be for an request_sock */
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switch (sk->sk_state) {
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struct request_sock *req, **prev;
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case DCCP_LISTEN:
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if (sock_owned_by_user(sk))
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goto out;
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req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
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&hdr->daddr, &hdr->saddr,
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inet6_iif(skb));
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if (!req)
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goto out;
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/* ICMPs are not backlogged, hence we cannot get
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* an established socket here.
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*/
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BUG_TRAP(req->sk == NULL);
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if (seq != dccp_rsk(req)->dreq_iss) {
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NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
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goto out;
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}
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inet_csk_reqsk_queue_drop(sk, req, prev);
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goto out;
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case DCCP_REQUESTING:
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case DCCP_RESPOND: /* Cannot happen.
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It can, it SYNs are crossed. --ANK */
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if (!sock_owned_by_user(sk)) {
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DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
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sk->sk_err = err;
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/*
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* Wake people up to see the error
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* (see connect in sock.c)
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*/
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sk->sk_error_report(sk);
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dccp_done(sk);
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} else
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sk->sk_err_soft = err;
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goto out;
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}
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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
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sk->sk_err_soft = err;
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out:
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bh_unlock_sock(sk);
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sock_put(sk);
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}
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static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
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struct dst_entry *dst)
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{
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struct inet6_request_sock *ireq6 = inet6_rsk(req);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct sk_buff *skb;
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struct ipv6_txoptions *opt = NULL;
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struct in6_addr *final_p = NULL, final;
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struct flowi fl;
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int err = -1;
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memset(&fl, 0, sizeof(fl));
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fl.proto = IPPROTO_DCCP;
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ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
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ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
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fl.fl6_flowlabel = 0;
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fl.oif = ireq6->iif;
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fl.fl_ip_dport = inet_rsk(req)->rmt_port;
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fl.fl_ip_sport = inet_sk(sk)->sport;
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if (dst == NULL) {
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opt = np->opt;
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if (opt == NULL &&
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np->rxopt.bits.osrcrt == 2 &&
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ireq6->pktopts) {
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struct sk_buff *pktopts = ireq6->pktopts;
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struct inet6_skb_parm *rxopt = IP6CB(pktopts);
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if (rxopt->srcrt)
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opt = ipv6_invert_rthdr(sk,
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(struct ipv6_rt_hdr *)(pktopts->nh.raw +
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rxopt->srcrt));
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}
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if (opt && opt->srcrt) {
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struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
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ipv6_addr_copy(&final, &fl.fl6_dst);
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ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
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final_p = &final;
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}
|
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err = ip6_dst_lookup(sk, &dst, &fl);
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if (err)
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goto done;
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if (final_p)
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ipv6_addr_copy(&fl.fl6_dst, final_p);
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if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
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goto done;
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}
|
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skb = dccp_make_response(sk, dst, req);
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if (skb != NULL) {
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struct dccp_hdr *dh = dccp_hdr(skb);
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dh->dccph_checksum = dccp_v6_check(dh, skb->len,
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&ireq6->loc_addr,
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&ireq6->rmt_addr,
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csum_partial((char *)dh,
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skb->len,
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skb->csum));
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ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
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err = ip6_xmit(sk, skb, &fl, opt, 0);
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if (err == NET_XMIT_CN)
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err = 0;
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}
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done:
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if (opt && opt != np->opt)
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sock_kfree_s(sk, opt, opt->tot_len);
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dst_release(dst);
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return err;
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}
|
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|
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static void dccp_v6_reqsk_destructor(struct request_sock *req)
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|
{
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if (inet6_rsk(req)->pktopts != NULL)
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kfree_skb(inet6_rsk(req)->pktopts);
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}
|
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|
|
static struct request_sock_ops dccp6_request_sock_ops = {
|
|
.family = AF_INET6,
|
|
.obj_size = sizeof(struct dccp6_request_sock),
|
|
.rtx_syn_ack = dccp_v6_send_response,
|
|
.send_ack = dccp_v6_reqsk_send_ack,
|
|
.destructor = dccp_v6_reqsk_destructor,
|
|
.send_reset = dccp_v6_ctl_send_reset,
|
|
};
|
|
|
|
static struct timewait_sock_ops dccp6_timewait_sock_ops = {
|
|
.twsk_obj_size = sizeof(struct dccp6_timewait_sock),
|
|
};
|
|
|
|
static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct dccp_hdr *dh = dccp_hdr(skb);
|
|
|
|
dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
|
|
len, IPPROTO_DCCP,
|
|
csum_partial((char *)dh,
|
|
dh->dccph_doff << 2,
|
|
skb->csum));
|
|
}
|
|
|
|
static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
|
|
{
|
|
struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
|
|
const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
|
|
sizeof(struct dccp_hdr_ext) +
|
|
sizeof(struct dccp_hdr_reset);
|
|
struct sk_buff *skb;
|
|
struct flowi fl;
|
|
u64 seqno;
|
|
|
|
if (rxdh->dccph_type == DCCP_PKT_RESET)
|
|
return;
|
|
|
|
if (!ipv6_unicast_destination(rxskb))
|
|
return;
|
|
|
|
/*
|
|
* We need to grab some memory, and put together an RST,
|
|
* and then put it into the queue to be sent.
|
|
*/
|
|
|
|
skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) +
|
|
dccp_hdr_reset_len, GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return;
|
|
|
|
skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) +
|
|
dccp_hdr_reset_len);
|
|
|
|
skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
|
|
dh = dccp_hdr(skb);
|
|
memset(dh, 0, dccp_hdr_reset_len);
|
|
|
|
/* Swap the send and the receive. */
|
|
dh->dccph_type = DCCP_PKT_RESET;
|
|
dh->dccph_sport = rxdh->dccph_dport;
|
|
dh->dccph_dport = rxdh->dccph_sport;
|
|
dh->dccph_doff = dccp_hdr_reset_len / 4;
|
|
dh->dccph_x = 1;
|
|
dccp_hdr_reset(skb)->dccph_reset_code =
|
|
DCCP_SKB_CB(rxskb)->dccpd_reset_code;
|
|
|
|
/* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
|
|
seqno = 0;
|
|
if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
|
|
dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
|
|
|
|
dccp_hdr_set_seq(dh, seqno);
|
|
dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
|
|
DCCP_SKB_CB(rxskb)->dccpd_seq);
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
|
|
ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
|
|
dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
|
|
sizeof(*dh), IPPROTO_DCCP,
|
|
skb->csum);
|
|
fl.proto = IPPROTO_DCCP;
|
|
fl.oif = inet6_iif(rxskb);
|
|
fl.fl_ip_dport = dh->dccph_dport;
|
|
fl.fl_ip_sport = dh->dccph_sport;
|
|
|
|
/* sk = NULL, but it is safe for now. RST socket required. */
|
|
if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
|
|
if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
|
|
ip6_xmit(NULL, skb, &fl, NULL, 0);
|
|
DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
|
|
DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
|
|
return;
|
|
}
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static void dccp_v6_ctl_send_ack(struct sk_buff *rxskb)
|
|
{
|
|
struct flowi fl;
|
|
struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
|
|
const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
|
|
sizeof(struct dccp_hdr_ext) +
|
|
sizeof(struct dccp_hdr_ack_bits);
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) +
|
|
dccp_hdr_ack_len, GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return;
|
|
|
|
skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) +
|
|
dccp_hdr_ack_len);
|
|
|
|
skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
|
|
dh = dccp_hdr(skb);
|
|
memset(dh, 0, dccp_hdr_ack_len);
|
|
|
|
/* Build DCCP header and checksum it. */
|
|
dh->dccph_type = DCCP_PKT_ACK;
|
|
dh->dccph_sport = rxdh->dccph_dport;
|
|
dh->dccph_dport = rxdh->dccph_sport;
|
|
dh->dccph_doff = dccp_hdr_ack_len / 4;
|
|
dh->dccph_x = 1;
|
|
|
|
dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
|
|
dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
|
|
DCCP_SKB_CB(rxskb)->dccpd_seq);
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
|
|
ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
|
|
|
|
/* FIXME: calculate checksum, IPv4 also should... */
|
|
|
|
fl.proto = IPPROTO_DCCP;
|
|
fl.oif = inet6_iif(rxskb);
|
|
fl.fl_ip_dport = dh->dccph_dport;
|
|
fl.fl_ip_sport = dh->dccph_sport;
|
|
|
|
if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
|
|
if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
|
|
ip6_xmit(NULL, skb, &fl, NULL, 0);
|
|
DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
|
|
return;
|
|
}
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
|
|
struct request_sock *req)
|
|
{
|
|
dccp_v6_ctl_send_ack(skb);
|
|
}
|
|
|
|
static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
|
|
{
|
|
const struct dccp_hdr *dh = dccp_hdr(skb);
|
|
const struct ipv6hdr *iph = skb->nh.ipv6h;
|
|
struct sock *nsk;
|
|
struct request_sock **prev;
|
|
/* Find possible connection requests. */
|
|
struct request_sock *req = inet6_csk_search_req(sk, &prev,
|
|
dh->dccph_sport,
|
|
&iph->saddr,
|
|
&iph->daddr,
|
|
inet6_iif(skb));
|
|
if (req != NULL)
|
|
return dccp_check_req(sk, skb, req, prev);
|
|
|
|
nsk = __inet6_lookup_established(&dccp_hashinfo,
|
|
&iph->saddr, dh->dccph_sport,
|
|
&iph->daddr, ntohs(dh->dccph_dport),
|
|
inet6_iif(skb));
|
|
|
|
if (nsk != NULL) {
|
|
if (nsk->sk_state != DCCP_TIME_WAIT) {
|
|
bh_lock_sock(nsk);
|
|
return nsk;
|
|
}
|
|
inet_twsk_put((struct inet_timewait_sock *)nsk);
|
|
return NULL;
|
|
}
|
|
|
|
return sk;
|
|
}
|
|
|
|
static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct inet_request_sock *ireq;
|
|
struct dccp_sock dp;
|
|
struct request_sock *req;
|
|
struct dccp_request_sock *dreq;
|
|
struct inet6_request_sock *ireq6;
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
const __u32 service = dccp_hdr_request(skb)->dccph_req_service;
|
|
struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
|
|
__u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
|
|
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
return dccp_v4_conn_request(sk, skb);
|
|
|
|
if (!ipv6_unicast_destination(skb))
|
|
goto drop;
|
|
|
|
if (dccp_bad_service_code(sk, service)) {
|
|
reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
|
|
goto drop;
|
|
}
|
|
/*
|
|
* There are no SYN attacks on IPv6, yet...
|
|
*/
|
|
if (inet_csk_reqsk_queue_is_full(sk))
|
|
goto drop;
|
|
|
|
if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
|
|
goto drop;
|
|
|
|
req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot);
|
|
if (req == NULL)
|
|
goto drop;
|
|
|
|
/* FIXME: process options */
|
|
|
|
dccp_openreq_init(req, &dp, skb);
|
|
|
|
ireq6 = inet6_rsk(req);
|
|
ireq = inet_rsk(req);
|
|
ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
|
|
ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
|
|
req->rcv_wnd = 100; /* Fake, option parsing will get the
|
|
right value */
|
|
ireq6->pktopts = NULL;
|
|
|
|
if (ipv6_opt_accepted(sk, skb) ||
|
|
np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
|
|
np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
|
|
atomic_inc(&skb->users);
|
|
ireq6->pktopts = skb;
|
|
}
|
|
ireq6->iif = sk->sk_bound_dev_if;
|
|
|
|
/* So that link locals have meaning */
|
|
if (!sk->sk_bound_dev_if &&
|
|
ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
|
|
ireq6->iif = inet6_iif(skb);
|
|
|
|
/*
|
|
* Step 3: Process LISTEN state
|
|
*
|
|
* Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
|
|
*
|
|
* In fact we defer setting S.GSR, S.SWL, S.SWH to
|
|
* dccp_create_openreq_child.
|
|
*/
|
|
dreq = dccp_rsk(req);
|
|
dreq->dreq_isr = dcb->dccpd_seq;
|
|
dreq->dreq_iss = dccp_v6_init_sequence(sk, skb);
|
|
dreq->dreq_service = service;
|
|
|
|
if (dccp_v6_send_response(sk, req, NULL))
|
|
goto drop_and_free;
|
|
|
|
inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
|
|
return 0;
|
|
|
|
drop_and_free:
|
|
reqsk_free(req);
|
|
drop:
|
|
DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
|
|
dcb->dccpd_reset_code = reset_code;
|
|
return -1;
|
|
}
|
|
|
|
static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
|
|
struct sk_buff *skb,
|
|
struct request_sock *req,
|
|
struct dst_entry *dst)
|
|
{
|
|
struct inet6_request_sock *ireq6 = inet6_rsk(req);
|
|
struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
|
|
struct inet_sock *newinet;
|
|
struct dccp_sock *newdp;
|
|
struct dccp6_sock *newdp6;
|
|
struct sock *newsk;
|
|
struct ipv6_txoptions *opt;
|
|
|
|
if (skb->protocol == htons(ETH_P_IP)) {
|
|
/*
|
|
* v6 mapped
|
|
*/
|
|
|
|
newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
|
|
if (newsk == NULL)
|
|
return NULL;
|
|
|
|
newdp6 = (struct dccp6_sock *)newsk;
|
|
newdp = dccp_sk(newsk);
|
|
newinet = inet_sk(newsk);
|
|
newinet->pinet6 = &newdp6->inet6;
|
|
newnp = inet6_sk(newsk);
|
|
|
|
memcpy(newnp, np, sizeof(struct ipv6_pinfo));
|
|
|
|
ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
|
|
newinet->daddr);
|
|
|
|
ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
|
|
newinet->saddr);
|
|
|
|
ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
|
|
|
|
inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
|
|
newsk->sk_backlog_rcv = dccp_v4_do_rcv;
|
|
newnp->pktoptions = NULL;
|
|
newnp->opt = NULL;
|
|
newnp->mcast_oif = inet6_iif(skb);
|
|
newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
|
|
|
|
/*
|
|
* No need to charge this sock to the relevant IPv6 refcnt debug socks count
|
|
* here, dccp_create_openreq_child now does this for us, see the comment in
|
|
* that function for the gory details. -acme
|
|
*/
|
|
|
|
/* It is tricky place. Until this moment IPv4 tcp
|
|
worked with IPv6 icsk.icsk_af_ops.
|
|
Sync it now.
|
|
*/
|
|
dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
|
|
|
|
return newsk;
|
|
}
|
|
|
|
opt = np->opt;
|
|
|
|
if (sk_acceptq_is_full(sk))
|
|
goto out_overflow;
|
|
|
|
if (np->rxopt.bits.osrcrt == 2 &&
|
|
opt == NULL && ireq6->pktopts) {
|
|
struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
|
|
if (rxopt->srcrt)
|
|
opt = ipv6_invert_rthdr(sk,
|
|
(struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
|
|
rxopt->srcrt));
|
|
}
|
|
|
|
if (dst == NULL) {
|
|
struct in6_addr *final_p = NULL, final;
|
|
struct flowi fl;
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
fl.proto = IPPROTO_DCCP;
|
|
ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
|
|
if (opt && opt->srcrt) {
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
|
|
ipv6_addr_copy(&final, &fl.fl6_dst);
|
|
ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
|
|
final_p = &final;
|
|
}
|
|
ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
|
|
fl.oif = sk->sk_bound_dev_if;
|
|
fl.fl_ip_dport = inet_rsk(req)->rmt_port;
|
|
fl.fl_ip_sport = inet_sk(sk)->sport;
|
|
|
|
if (ip6_dst_lookup(sk, &dst, &fl))
|
|
goto out;
|
|
|
|
if (final_p)
|
|
ipv6_addr_copy(&fl.fl6_dst, final_p);
|
|
|
|
if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
|
|
goto out;
|
|
}
|
|
|
|
newsk = dccp_create_openreq_child(sk, req, skb);
|
|
if (newsk == NULL)
|
|
goto out;
|
|
|
|
/*
|
|
* No need to charge this sock to the relevant IPv6 refcnt debug socks
|
|
* count here, dccp_create_openreq_child now does this for us, see the
|
|
* comment in that function for the gory details. -acme
|
|
*/
|
|
|
|
ip6_dst_store(newsk, dst, NULL);
|
|
newsk->sk_route_caps = dst->dev->features &
|
|
~(NETIF_F_IP_CSUM | NETIF_F_TSO);
|
|
|
|
newdp6 = (struct dccp6_sock *)newsk;
|
|
newinet = inet_sk(newsk);
|
|
newinet->pinet6 = &newdp6->inet6;
|
|
newdp = dccp_sk(newsk);
|
|
newnp = inet6_sk(newsk);
|
|
|
|
memcpy(newnp, np, sizeof(struct ipv6_pinfo));
|
|
|
|
ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
|
|
ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
|
|
ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
|
|
newsk->sk_bound_dev_if = ireq6->iif;
|
|
|
|
/* Now IPv6 options...
|
|
|
|
First: no IPv4 options.
|
|
*/
|
|
newinet->opt = NULL;
|
|
|
|
/* Clone RX bits */
|
|
newnp->rxopt.all = np->rxopt.all;
|
|
|
|
/* Clone pktoptions received with SYN */
|
|
newnp->pktoptions = NULL;
|
|
if (ireq6->pktopts != NULL) {
|
|
newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
|
|
kfree_skb(ireq6->pktopts);
|
|
ireq6->pktopts = NULL;
|
|
if (newnp->pktoptions)
|
|
skb_set_owner_r(newnp->pktoptions, newsk);
|
|
}
|
|
newnp->opt = NULL;
|
|
newnp->mcast_oif = inet6_iif(skb);
|
|
newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
|
|
|
|
/* Clone native IPv6 options from listening socket (if any)
|
|
|
|
Yes, keeping reference count would be much more clever,
|
|
but we make one more one thing there: reattach optmem
|
|
to newsk.
|
|
*/
|
|
if (opt) {
|
|
newnp->opt = ipv6_dup_options(newsk, opt);
|
|
if (opt != np->opt)
|
|
sock_kfree_s(sk, opt, opt->tot_len);
|
|
}
|
|
|
|
inet_csk(newsk)->icsk_ext_hdr_len = 0;
|
|
if (newnp->opt)
|
|
inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
|
|
newnp->opt->opt_flen);
|
|
|
|
dccp_sync_mss(newsk, dst_mtu(dst));
|
|
|
|
newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
|
|
|
|
__inet6_hash(&dccp_hashinfo, newsk);
|
|
inet_inherit_port(&dccp_hashinfo, sk, newsk);
|
|
|
|
return newsk;
|
|
|
|
out_overflow:
|
|
NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
|
|
out:
|
|
NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
|
|
if (opt && opt != np->opt)
|
|
sock_kfree_s(sk, opt, opt->tot_len);
|
|
dst_release(dst);
|
|
return NULL;
|
|
}
|
|
|
|
/* The socket must have it's spinlock held when we get
|
|
* here.
|
|
*
|
|
* We have a potential double-lock case here, so even when
|
|
* doing backlog processing we use the BH locking scheme.
|
|
* This is because we cannot sleep with the original spinlock
|
|
* held.
|
|
*/
|
|
static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct sk_buff *opt_skb = NULL;
|
|
|
|
/* Imagine: socket is IPv6. IPv4 packet arrives,
|
|
goes to IPv4 receive handler and backlogged.
|
|
From backlog it always goes here. Kerboom...
|
|
Fortunately, dccp_rcv_established and rcv_established
|
|
handle them correctly, but it is not case with
|
|
dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
|
|
*/
|
|
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
return dccp_v4_do_rcv(sk, skb);
|
|
|
|
if (sk_filter(sk, skb, 0))
|
|
goto discard;
|
|
|
|
/*
|
|
* socket locking is here for SMP purposes as backlog rcv
|
|
* is currently called with bh processing disabled.
|
|
*/
|
|
|
|
/* Do Stevens' IPV6_PKTOPTIONS.
|
|
|
|
Yes, guys, it is the only place in our code, where we
|
|
may make it not affecting IPv4.
|
|
The rest of code is protocol independent,
|
|
and I do not like idea to uglify IPv4.
|
|
|
|
Actually, all the idea behind IPV6_PKTOPTIONS
|
|
looks not very well thought. For now we latch
|
|
options, received in the last packet, enqueued
|
|
by tcp. Feel free to propose better solution.
|
|
--ANK (980728)
|
|
*/
|
|
if (np->rxopt.all)
|
|
opt_skb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (sk->sk_state == DCCP_OPEN) { /* Fast path */
|
|
if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
|
|
goto reset;
|
|
return 0;
|
|
}
|
|
|
|
if (sk->sk_state == DCCP_LISTEN) {
|
|
struct sock *nsk = dccp_v6_hnd_req(sk, skb);
|
|
if (!nsk)
|
|
goto discard;
|
|
|
|
/*
|
|
* Queue it on the new socket if the new socket is active,
|
|
* otherwise we just shortcircuit this and continue with
|
|
* the new socket..
|
|
*/
|
|
if(nsk != sk) {
|
|
if (dccp_child_process(sk, nsk, skb))
|
|
goto reset;
|
|
if (opt_skb)
|
|
__kfree_skb(opt_skb);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
|
|
goto reset;
|
|
return 0;
|
|
|
|
reset:
|
|
dccp_v6_ctl_send_reset(skb);
|
|
discard:
|
|
if (opt_skb)
|
|
__kfree_skb(opt_skb);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int dccp_v6_rcv(struct sk_buff **pskb)
|
|
{
|
|
const struct dccp_hdr *dh;
|
|
struct sk_buff *skb = *pskb;
|
|
struct sock *sk;
|
|
|
|
/* Step 1: Check header basics: */
|
|
|
|
if (dccp_invalid_packet(skb))
|
|
goto discard_it;
|
|
|
|
dh = dccp_hdr(skb);
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
|
|
DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
|
|
|
|
if (dccp_packet_without_ack(skb))
|
|
DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
|
|
else
|
|
DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
|
|
|
|
/* Step 2:
|
|
* Look up flow ID in table and get corresponding socket */
|
|
sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
|
|
dh->dccph_sport,
|
|
&skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
|
|
inet6_iif(skb));
|
|
/*
|
|
* Step 2:
|
|
* If no socket ...
|
|
* Generate Reset(No Connection) unless P.type == Reset
|
|
* Drop packet and return
|
|
*/
|
|
if (sk == NULL)
|
|
goto no_dccp_socket;
|
|
|
|
/*
|
|
* Step 2:
|
|
* ... or S.state == TIMEWAIT,
|
|
* Generate Reset(No Connection) unless P.type == Reset
|
|
* Drop packet and return
|
|
*/
|
|
|
|
if (sk->sk_state == DCCP_TIME_WAIT)
|
|
goto do_time_wait;
|
|
|
|
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
|
|
goto discard_and_relse;
|
|
|
|
return sk_receive_skb(sk, skb) ? -1 : 0;
|
|
|
|
no_dccp_socket:
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto discard_it;
|
|
/*
|
|
* Step 2:
|
|
* Generate Reset(No Connection) unless P.type == Reset
|
|
* Drop packet and return
|
|
*/
|
|
if (dh->dccph_type != DCCP_PKT_RESET) {
|
|
DCCP_SKB_CB(skb)->dccpd_reset_code =
|
|
DCCP_RESET_CODE_NO_CONNECTION;
|
|
dccp_v6_ctl_send_reset(skb);
|
|
}
|
|
discard_it:
|
|
|
|
/*
|
|
* Discard frame
|
|
*/
|
|
|
|
kfree_skb(skb);
|
|
return 0;
|
|
|
|
discard_and_relse:
|
|
sock_put(sk);
|
|
goto discard_it;
|
|
|
|
do_time_wait:
|
|
inet_twsk_put((struct inet_timewait_sock *)sk);
|
|
goto no_dccp_socket;
|
|
}
|
|
|
|
static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
|
|
.queue_xmit = inet6_csk_xmit,
|
|
.send_check = dccp_v6_send_check,
|
|
.rebuild_header = inet6_sk_rebuild_header,
|
|
.conn_request = dccp_v6_conn_request,
|
|
.syn_recv_sock = dccp_v6_request_recv_sock,
|
|
.net_header_len = sizeof(struct ipv6hdr),
|
|
.setsockopt = ipv6_setsockopt,
|
|
.getsockopt = ipv6_getsockopt,
|
|
.addr2sockaddr = inet6_csk_addr2sockaddr,
|
|
.sockaddr_len = sizeof(struct sockaddr_in6)
|
|
};
|
|
|
|
/*
|
|
* DCCP over IPv4 via INET6 API
|
|
*/
|
|
static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
|
|
.queue_xmit = ip_queue_xmit,
|
|
.send_check = dccp_v4_send_check,
|
|
.rebuild_header = inet_sk_rebuild_header,
|
|
.conn_request = dccp_v6_conn_request,
|
|
.syn_recv_sock = dccp_v6_request_recv_sock,
|
|
.net_header_len = sizeof(struct iphdr),
|
|
.setsockopt = ipv6_setsockopt,
|
|
.getsockopt = ipv6_getsockopt,
|
|
.addr2sockaddr = inet6_csk_addr2sockaddr,
|
|
.sockaddr_len = sizeof(struct sockaddr_in6)
|
|
};
|
|
|
|
/* NOTE: A lot of things set to zero explicitly by call to
|
|
* sk_alloc() so need not be done here.
|
|
*/
|
|
static int dccp_v6_init_sock(struct sock *sk)
|
|
{
|
|
int err = dccp_v4_init_sock(sk);
|
|
|
|
if (err == 0)
|
|
inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int dccp_v6_destroy_sock(struct sock *sk)
|
|
{
|
|
dccp_v4_destroy_sock(sk);
|
|
return inet6_destroy_sock(sk);
|
|
}
|
|
|
|
static struct proto dccp_v6_prot = {
|
|
.name = "DCCPv6",
|
|
.owner = THIS_MODULE,
|
|
.close = dccp_close,
|
|
.connect = dccp_v6_connect,
|
|
.disconnect = dccp_disconnect,
|
|
.ioctl = dccp_ioctl,
|
|
.init = dccp_v6_init_sock,
|
|
.setsockopt = dccp_setsockopt,
|
|
.getsockopt = dccp_getsockopt,
|
|
.sendmsg = dccp_sendmsg,
|
|
.recvmsg = dccp_recvmsg,
|
|
.backlog_rcv = dccp_v6_do_rcv,
|
|
.hash = dccp_v6_hash,
|
|
.unhash = dccp_unhash,
|
|
.accept = inet_csk_accept,
|
|
.get_port = dccp_v6_get_port,
|
|
.shutdown = dccp_shutdown,
|
|
.destroy = dccp_v6_destroy_sock,
|
|
.orphan_count = &dccp_orphan_count,
|
|
.max_header = MAX_DCCP_HEADER,
|
|
.obj_size = sizeof(struct dccp6_sock),
|
|
.rsk_prot = &dccp6_request_sock_ops,
|
|
.twsk_prot = &dccp6_timewait_sock_ops,
|
|
};
|
|
|
|
static struct inet6_protocol dccp_v6_protocol = {
|
|
.handler = dccp_v6_rcv,
|
|
.err_handler = dccp_v6_err,
|
|
.flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
|
|
};
|
|
|
|
static struct proto_ops inet6_dccp_ops = {
|
|
.family = PF_INET6,
|
|
.owner = THIS_MODULE,
|
|
.release = inet6_release,
|
|
.bind = inet6_bind,
|
|
.connect = inet_stream_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = inet_accept,
|
|
.getname = inet6_getname,
|
|
.poll = dccp_poll,
|
|
.ioctl = inet6_ioctl,
|
|
.listen = inet_dccp_listen,
|
|
.shutdown = inet_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = sock_common_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static struct inet_protosw dccp_v6_protosw = {
|
|
.type = SOCK_DCCP,
|
|
.protocol = IPPROTO_DCCP,
|
|
.prot = &dccp_v6_prot,
|
|
.ops = &inet6_dccp_ops,
|
|
.capability = -1,
|
|
.flags = INET_PROTOSW_ICSK,
|
|
};
|
|
|
|
static int __init dccp_v6_init(void)
|
|
{
|
|
int err = proto_register(&dccp_v6_prot, 1);
|
|
|
|
if (err != 0)
|
|
goto out;
|
|
|
|
err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
|
|
if (err != 0)
|
|
goto out_unregister_proto;
|
|
|
|
inet6_register_protosw(&dccp_v6_protosw);
|
|
out:
|
|
return err;
|
|
out_unregister_proto:
|
|
proto_unregister(&dccp_v6_prot);
|
|
goto out;
|
|
}
|
|
|
|
static void __exit dccp_v6_exit(void)
|
|
{
|
|
inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
|
|
inet6_unregister_protosw(&dccp_v6_protosw);
|
|
proto_unregister(&dccp_v6_prot);
|
|
}
|
|
|
|
module_init(dccp_v6_init);
|
|
module_exit(dccp_v6_exit);
|
|
|
|
/*
|
|
* __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
|
|
* values directly, Also cover the case where the protocol is not specified,
|
|
* i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
|
|
*/
|
|
MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
|
|
MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
|
|
MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
|