| /* |
| * 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/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" |
| #include "feat.h" |
| |
| /* Socket used for sending RSTs and ACKs */ |
| static struct socket *dccp_v6_ctl_socket; |
| |
| 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_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); |
| |
| return secure_dccp_sequence_number(skb->nh.iph->daddr, |
| skb->nh.iph->saddr, |
| dh->dccph_dport, |
| dh->dccph_sport); |
| } |
| |
| static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
| int addr_len) |
| { |
| struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct dccp_sock *dp = dccp_sk(sk); |
| struct in6_addr *saddr = NULL, *final_p = NULL, final; |
| struct flowi fl; |
| struct dst_entry *dst; |
| int addr_type; |
| int err; |
| |
| dp->dccps_role = DCCP_ROLE_CLIENT; |
| |
| if (addr_len < SIN6_LEN_RFC2133) |
| return -EINVAL; |
| |
| if (usin->sin6_family != AF_INET6) |
| return -EAFNOSUPPORT; |
| |
| memset(&fl, 0, sizeof(fl)); |
| |
| if (np->sndflow) { |
| fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
| IP6_ECN_flow_init(fl.fl6_flowlabel); |
| if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { |
| struct ip6_flowlabel *flowlabel; |
| flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
| if (flowlabel == NULL) |
| return -EINVAL; |
| ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); |
| fl6_sock_release(flowlabel); |
| } |
| } |
| /* |
| * connect() to INADDR_ANY means loopback (BSD'ism). |
| */ |
| if (ipv6_addr_any(&usin->sin6_addr)) |
| usin->sin6_addr.s6_addr[15] = 1; |
| |
| addr_type = ipv6_addr_type(&usin->sin6_addr); |
| |
| if (addr_type & IPV6_ADDR_MULTICAST) |
| return -ENETUNREACH; |
| |
| if (addr_type & IPV6_ADDR_LINKLOCAL) { |
| if (addr_len >= sizeof(struct sockaddr_in6) && |
| usin->sin6_scope_id) { |
| /* If interface is set while binding, indices |
| * must coincide. |
| */ |
| if (sk->sk_bound_dev_if && |
| sk->sk_bound_dev_if != usin->sin6_scope_id) |
| return -EINVAL; |
| |
| sk->sk_bound_dev_if = usin->sin6_scope_id; |
| } |
| |
| /* Connect to link-local address requires an interface */ |
| if (!sk->sk_bound_dev_if) |
| return -EINVAL; |
| } |
| |
| ipv6_addr_copy(&np->daddr, &usin->sin6_addr); |
| np->flow_label = fl.fl6_flowlabel; |
| |
| /* |
| * DCCP over IPv4 |
| */ |
| if (addr_type == IPV6_ADDR_MAPPED) { |
| u32 exthdrlen = icsk->icsk_ext_hdr_len; |
| struct sockaddr_in sin; |
| |
| SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
| |
| if (__ipv6_only_sock(sk)) |
| return -ENETUNREACH; |
| |
| sin.sin_family = AF_INET; |
| sin.sin_port = usin->sin6_port; |
| sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
| |
| icsk->icsk_af_ops = &dccp_ipv6_mapped; |
| sk->sk_backlog_rcv = dccp_v4_do_rcv; |
| |
| err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
| if (err) { |
| icsk->icsk_ext_hdr_len = exthdrlen; |
| icsk->icsk_af_ops = &dccp_ipv6_af_ops; |
| sk->sk_backlog_rcv = dccp_v6_do_rcv; |
| goto failure; |
| } else { |
| ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), |
| inet->saddr); |
| ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), |
| inet->rcv_saddr); |
| } |
| |
| return err; |
| } |
| |
| if (!ipv6_addr_any(&np->rcv_saddr)) |
| saddr = &np->rcv_saddr; |
| |
| fl.proto = IPPROTO_DCCP; |
| ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); |
| fl.oif = sk->sk_bound_dev_if; |
| fl.fl_ip_dport = usin->sin6_port; |
| fl.fl_ip_sport = inet->sport; |
| security_sk_classify_flow(sk, &fl); |
| |
| if (np->opt != NULL && np->opt->srcrt != NULL) { |
| const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| } |
| |
| err = ip6_dst_lookup(sk, &dst, &fl); |
| if (err) |
| goto failure; |
| |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| err = xfrm_lookup(&dst, &fl, sk, 0); |
| if (err < 0) |
| goto failure; |
| |
| if (saddr == NULL) { |
| saddr = &fl.fl6_src; |
| ipv6_addr_copy(&np->rcv_saddr, saddr); |
| } |
| |
| /* set the source address */ |
| ipv6_addr_copy(&np->saddr, saddr); |
| inet->rcv_saddr = LOOPBACK4_IPV6; |
| |
| __ip6_dst_store(sk, dst, NULL); |
| |
| icsk->icsk_ext_hdr_len = 0; |
| if (np->opt != NULL) |
| icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
| np->opt->opt_nflen); |
| |
| inet->dport = usin->sin6_port; |
| |
| dccp_set_state(sk, DCCP_REQUESTING); |
| err = inet6_hash_connect(&dccp_death_row, sk); |
| if (err) |
| goto late_failure; |
| /* FIXME */ |
| #if 0 |
| dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32, |
| np->daddr.s6_addr32, |
| inet->sport, |
| inet->dport); |
| #endif |
| err = dccp_connect(sk); |
| if (err) |
| goto late_failure; |
| |
| return 0; |
| |
| late_failure: |
| dccp_set_state(sk, DCCP_CLOSED); |
| __sk_dst_reset(sk); |
| failure: |
| inet->dport = 0; |
| sk->sk_route_caps = 0; |
| return err; |
| } |
| |
| static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| int type, int code, int offset, __be32 info) |
| { |
| struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; |
| const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); |
| struct ipv6_pinfo *np; |
| struct sock *sk; |
| int err; |
| __u64 seq; |
| |
| sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport, |
| &hdr->saddr, dh->dccph_sport, skb->dev->ifindex); |
| |
| if (sk == NULL) { |
| ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
| return; |
| } |
| |
| if (sk->sk_state == DCCP_TIME_WAIT) { |
| inet_twsk_put((struct inet_timewait_sock *)sk); |
| return; |
| } |
| |
| bh_lock_sock(sk); |
| if (sock_owned_by_user(sk)) |
| NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); |
| |
| if (sk->sk_state == DCCP_CLOSED) |
| goto out; |
| |
| np = inet6_sk(sk); |
| |
| if (type == ICMPV6_PKT_TOOBIG) { |
| struct dst_entry *dst = NULL; |
| |
| if (sock_owned_by_user(sk)) |
| goto out; |
| if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) |
| goto out; |
| |
| /* icmp should have updated the destination cache entry */ |
| dst = __sk_dst_check(sk, np->dst_cookie); |
| if (dst == NULL) { |
| struct inet_sock *inet = inet_sk(sk); |
| struct flowi fl; |
| |
| /* BUGGG_FUTURE: Again, it is not clear how |
| to handle rthdr case. Ignore this complexity |
| for now. |
| */ |
| memset(&fl, 0, sizeof(fl)); |
| fl.proto = IPPROTO_DCCP; |
| ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| fl.oif = sk->sk_bound_dev_if; |
| fl.fl_ip_dport = inet->dport; |
| fl.fl_ip_sport = inet->sport; |
| security_sk_classify_flow(sk, &fl); |
| |
| err = ip6_dst_lookup(sk, &dst, &fl); |
| if (err) { |
| sk->sk_err_soft = -err; |
| goto out; |
| } |
| |
| err = xfrm_lookup(&dst, &fl, sk, 0); |
| if (err < 0) { |
| sk->sk_err_soft = -err; |
| goto out; |
| } |
| } else |
| dst_hold(dst); |
| |
| if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
| dccp_sync_mss(sk, dst_mtu(dst)); |
| } /* else let the usual retransmit timer handle it */ |
| dst_release(dst); |
| goto out; |
| } |
| |
| icmpv6_err_convert(type, code, &err); |
| |
| seq = DCCP_SKB_CB(skb)->dccpd_seq; |
| /* Might be for an request_sock */ |
| switch (sk->sk_state) { |
| struct request_sock *req, **prev; |
| case DCCP_LISTEN: |
| if (sock_owned_by_user(sk)) |
| goto out; |
| |
| req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, |
| &hdr->daddr, &hdr->saddr, |
| inet6_iif(skb)); |
| if (req == NULL) |
| goto out; |
| |
| /* |
| * ICMPs are not backlogged, hence we cannot get an established |
| * socket here. |
| */ |
| BUG_TRAP(req->sk == NULL); |
| |
| if (seq != dccp_rsk(req)->dreq_iss) { |
| NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| goto out; |
| } |
| |
| inet_csk_reqsk_queue_drop(sk, req, prev); |
| goto out; |
| |
| case DCCP_REQUESTING: |
| case DCCP_RESPOND: /* Cannot happen. |
| It can, it SYNs are crossed. --ANK */ |
| if (!sock_owned_by_user(sk)) { |
| DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); |
| sk->sk_err = err; |
| /* |
| * Wake people up to see the error |
| * (see connect in sock.c) |
| */ |
| sk->sk_error_report(sk); |
| dccp_done(sk); |
| } else |
| sk->sk_err_soft = err; |
| goto out; |
| } |
| |
| if (!sock_owned_by_user(sk) && np->recverr) { |
| sk->sk_err = err; |
| sk->sk_error_report(sk); |
| } else |
| sk->sk_err_soft = err; |
| |
| out: |
| bh_unlock_sock(sk); |
| sock_put(sk); |
| } |
| |
| |
| static int dccp_v6_send_response(struct sock *sk, struct request_sock *req, |
| struct dst_entry *dst) |
| { |
| struct inet6_request_sock *ireq6 = inet6_rsk(req); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sk_buff *skb; |
| struct ipv6_txoptions *opt = NULL; |
| struct in6_addr *final_p = NULL, final; |
| struct flowi fl; |
| int err = -1; |
| |
| memset(&fl, 0, sizeof(fl)); |
| fl.proto = IPPROTO_DCCP; |
| ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
| ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); |
| fl.fl6_flowlabel = 0; |
| fl.oif = ireq6->iif; |
| fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
| fl.fl_ip_sport = inet_sk(sk)->sport; |
| security_sk_classify_flow(sk, &fl); |
| |
| if (dst == NULL) { |
| opt = np->opt; |
| if (opt == NULL && |
| np->rxopt.bits.osrcrt == 2 && |
| ireq6->pktopts) { |
| struct sk_buff *pktopts = ireq6->pktopts; |
| struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
| |
| if (rxopt->srcrt) |
| opt = ipv6_invert_rthdr(sk, |
| (struct ipv6_rt_hdr *)(pktopts->nh.raw + |
| rxopt->srcrt)); |
| } |
| |
| if (opt != NULL && opt->srcrt != NULL) { |
| const 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; |
| } |
| |
| err = ip6_dst_lookup(sk, &dst, &fl); |
| if (err) |
| goto done; |
| |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| err = xfrm_lookup(&dst, &fl, sk, 0); |
| if (err < 0) |
| goto done; |
| } |
| |
| skb = dccp_make_response(sk, dst, req); |
| if (skb != NULL) { |
| struct dccp_hdr *dh = dccp_hdr(skb); |
| |
| dh->dccph_checksum = dccp_v6_check(dh, skb->len, |
| &ireq6->loc_addr, |
| &ireq6->rmt_addr, |
| csum_partial((char *)dh, |
| skb->len, |
| skb->csum)); |
| ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
| err = ip6_xmit(sk, skb, &fl, opt, 0); |
| if (err == NET_XMIT_CN) |
| err = 0; |
| } |
| |
| done: |
| if (opt != NULL && opt != np->opt) |
| sock_kfree_s(sk, opt, opt->tot_len); |
| dst_release(dst); |
| return err; |
| } |
| |
| static void dccp_v6_reqsk_destructor(struct request_sock *req) |
| { |
| if (inet6_rsk(req)->pktopts != NULL) |
| kfree_skb(inet6_rsk(req)->pktopts); |
| } |
| |
| 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 u32 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; |
| |
| skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header, |
| GFP_ATOMIC); |
| if (skb == NULL) |
| return; |
| |
| skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header); |
| |
| 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; |
| security_skb_classify_flow(rxskb, &fl); |
| |
| /* 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(dccp_v6_ctl_socket->sk, 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_reqsk_send_ack(struct sk_buff *rxskb, |
| struct request_sock *req) |
| { |
| struct flowi fl; |
| struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; |
| const u32 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(dccp_v6_ctl_socket->sk->sk_prot->max_header, |
| GFP_ATOMIC); |
| if (skb == NULL) |
| return; |
| |
| skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header); |
| |
| 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; |
| security_skb_classify_flow(rxskb, &fl); |
| |
| if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { |
| if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { |
| ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0); |
| DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
| return; |
| } |
| } |
| |
| kfree_skb(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 __be32 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 = dccp_feat_default_sequence_window; |
| 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) { |
| const 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 != NULL && opt->srcrt != NULL) { |
| const 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; |
| security_sk_classify_flow(sk, &fl); |
| |
| 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 != NULL) { |
| 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 != NULL) |
| 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 != NULL && 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 == NULL) |
| 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 != NULL) |
| __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 != NULL) |
| __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), |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_ipv6_setsockopt, |
| .compat_getsockopt = compat_ipv6_getsockopt, |
| #endif |
| }; |
| |
| /* |
| * 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), |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_ipv6_setsockopt, |
| .compat_getsockopt = compat_ipv6_getsockopt, |
| #endif |
| }; |
| |
| /* 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) |
| { |
| static __u8 dccp_v6_ctl_sock_initialized; |
| int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); |
| |
| if (err == 0) { |
| if (unlikely(!dccp_v6_ctl_sock_initialized)) |
| dccp_v6_ctl_sock_initialized = 1; |
| inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
| } |
| |
| return err; |
| } |
| |
| static int dccp_v6_destroy_sock(struct sock *sk) |
| { |
| dccp_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, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_dccp_setsockopt, |
| .compat_getsockopt = compat_dccp_getsockopt, |
| #endif |
| }; |
| |
| 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, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_sock_common_setsockopt, |
| .compat_getsockopt = compat_sock_common_getsockopt, |
| #endif |
| }; |
| |
| 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); |
| |
| err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6, |
| SOCK_DCCP, IPPROTO_DCCP); |
| if (err != 0) |
| goto out_unregister_protosw; |
| out: |
| return err; |
| out_unregister_protosw: |
| inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
| inet6_unregister_protosw(&dccp_v6_protosw); |
| 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"); |