/* * DCCP over IPv6 * Linux INET6 implementation * * Based on net/dccp6/ipv6.c * * Arnaldo Carvalho de Melo * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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, 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, inet6_iif(skb)); 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(inet_twsk(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_req_classify_flow(req, &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); dh = dccp_zeroed_hdr(skb, 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 RFC 4340 */ 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); dh = dccp_zeroed_hdr(skb, 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_req_classify_flow(req, &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(inet_twsk(nsk)); return NULL; } return sk; } static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) { 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(&dccp6_request_sock_ops); if (req == NULL) goto drop; /* FIXME: process options */ dccp_openreq_init(req, &dp, skb); if (security_inet_conn_request(sk, skb, req)) goto drop_and_free; ireq6 = inet6_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, 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)) 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) /* * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. */ 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; if (opt_skb) { /* XXX This is where we would goto ipv6_pktoptions. */ __kfree_skb(opt_skb); } 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; if (opt_skb) { /* XXX This is where we would goto ipv6_pktoptions. */ __kfree_skb(opt_skb); } 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) { dccp_pr_debug("failed to look up flow ID in table and " "get corresponding socket\n"); 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) { dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); inet_twsk_put(inet_twsk(sk)); goto no_dccp_socket; } 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: kfree_skb(skb); return 0; discard_and_relse: sock_put(sk); goto discard_it; } 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 "); MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");