/*- * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * a) Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * b) Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the distribution. * * c) Neither the name of Cisco Systems, Inc. nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ /* $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $ */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #if defined(INET6) #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef IPSEC #include #if defined(INET6) #include #endif /* INET6 */ #endif /* IPSEC */ extern struct protosw inetsw[]; int sctp6_input(struct mbuf **i_pak, int *offp, int proto) { struct mbuf *m; struct ip6_hdr *ip6; struct sctphdr *sh; struct sctp_inpcb *in6p = NULL; struct sctp_nets *net; int refcount_up = 0; uint32_t vrf_id = 0; #ifdef IPSEC struct inpcb *in6p_ip; #endif struct sctp_chunkhdr *ch; int length, offset, iphlen; uint8_t ecn_bits; struct sctp_tcb *stcb = NULL; int pkt_len = 0; #if !defined(SCTP_WITH_NO_CSUM) uint32_t check, calc_check; #endif int off = *offp; uint16_t port = 0; /* get the VRF and table id's */ if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) { SCTP_RELEASE_PKT(*i_pak); return (-1); } m = SCTP_HEADER_TO_CHAIN(*i_pak); pkt_len = SCTP_HEADER_LEN((*i_pak)); #ifdef SCTP_PACKET_LOGGING sctp_packet_log(m, pkt_len); #endif ip6 = mtod(m, struct ip6_hdr *); /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */ IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, (int)(sizeof(*sh) + sizeof(*ch))); if (sh == NULL) { SCTP_STAT_INCR(sctps_hdrops); return IPPROTO_DONE; } ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); iphlen = off; offset = iphlen + sizeof(*sh) + sizeof(*ch); SCTPDBG(SCTP_DEBUG_INPUT1, "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen); #if defined(NFAITH) && NFAITH > 0 if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) { /* XXX send icmp6 host/port unreach? */ goto bad; } #endif /* NFAITH defined and > 0 */ SCTP_STAT_INCR(sctps_recvpackets); SCTP_STAT_INCR_COUNTER64(sctps_inpackets); SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n", iphlen, pkt_len); if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { /* No multi-cast support in SCTP */ goto bad; } /* destination port of 0 is illegal, based on RFC2960. */ if (sh->dest_port == 0) goto bad; SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", m->m_pkthdr.len, if_name(m->m_pkthdr.rcvif), m->m_pkthdr.csum_flags); #if defined(SCTP_WITH_NO_CSUM) SCTP_STAT_INCR(sctps_recvnocrc); #else if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { SCTP_STAT_INCR(sctps_recvhwcrc); goto sctp_skip_csum; } check = sh->checksum; /* save incoming checksum */ if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) { SCTP_STAT_INCR(sctps_recvnocrc); goto sctp_skip_csum; } sh->checksum = 0; /* prepare for calc */ calc_check = sctp_calculate_cksum(m, iphlen); SCTP_STAT_INCR(sctps_recvswcrc); if (calc_check != check) { SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p phlen:%d\n", calc_check, check, m, iphlen); stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), sh, ch, &in6p, &net, vrf_id); if ((net) && (port)) { if (net->port == 0) { sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr)); } net->port = port; } /* in6p's ref-count increased && stcb locked */ if ((in6p) && (stcb)) { sctp_send_packet_dropped(stcb, net, m, iphlen, 1); sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); } else if ((in6p != NULL) && (stcb == NULL)) { refcount_up = 1; } SCTP_STAT_INCR(sctps_badsum); SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); goto bad; } sh->checksum = calc_check; sctp_skip_csum: #endif net = NULL; /* * Locate pcb and tcb for datagram sctp_findassociation_addr() wants * IP/SCTP/first chunk header... */ stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), sh, ch, &in6p, &net, vrf_id); if ((net) && (port)) { if (net->port == 0) { sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr)); } net->port = port; } /* in6p's ref-count increased */ if (in6p == NULL) { struct sctp_init_chunk *init_chk, chunk_buf; SCTP_STAT_INCR(sctps_noport); if (ch->chunk_type == SCTP_INITIATION) { /* * we do a trick here to get the INIT tag, dig in * and get the tag from the INIT and put it in the * common header. */ init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, iphlen + sizeof(*sh), sizeof(*init_chk), (uint8_t *) & chunk_buf); if (init_chk) sh->v_tag = init_chk->init.initiate_tag; else sh->v_tag = 0; } if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); goto bad; } if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { goto bad; } if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); goto bad; } else if (stcb == NULL) { refcount_up = 1; } #ifdef IPSEC /* * Check AH/ESP integrity. */ in6p_ip = (struct inpcb *)in6p; if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) { /* XXX */ MODULE_GLOBAL(ipsec6stat).in_polvio++; goto bad; } #endif /* IPSEC */ /* * CONTROL chunk processing */ offset -= sizeof(*ch); ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff); /* Length now holds the total packet length payload + iphlen */ length = ntohs(ip6->ip6_plen) + iphlen; /* sa_ignore NO_NULL_CHK */ sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, in6p, stcb, net, ecn_bits, vrf_id, port); /* inp's ref-count reduced && stcb unlocked */ /* XXX this stuff below gets moved to appropriate parts later... */ if (m) sctp_m_freem(m); if ((in6p) && refcount_up) { /* reduce ref-count */ SCTP_INP_WLOCK(in6p); SCTP_INP_DECR_REF(in6p); SCTP_INP_WUNLOCK(in6p); } return IPPROTO_DONE; bad: if (stcb) { SCTP_TCB_UNLOCK(stcb); } if ((in6p) && refcount_up) { /* reduce ref-count */ SCTP_INP_WLOCK(in6p); SCTP_INP_DECR_REF(in6p); SCTP_INP_WUNLOCK(in6p); } if (m) sctp_m_freem(m); return IPPROTO_DONE; } static void sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6, struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net) { uint32_t nxtsz; if ((inp == NULL) || (stcb == NULL) || (net == NULL) || (icmp6 == NULL) || (sh == NULL)) { goto out; } /* First do we even look at it? */ if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) goto out; if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) { /* not PACKET TO BIG */ goto out; } /* * ok we need to look closely. We could even get smarter and look at * anyone that we sent to in case we get a different ICMP that tells * us there is no way to reach a host, but for this impl, all we * care about is MTU discovery. */ nxtsz = ntohl(icmp6->icmp6_mtu); /* Stop any PMTU timer */ sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1); /* Adjust destination size limit */ if (net->mtu > nxtsz) { net->mtu = nxtsz; if (net->port) { net->mtu -= sizeof(struct udphdr); } } /* now what about the ep? */ if (stcb->asoc.smallest_mtu > nxtsz) { struct sctp_tmit_chunk *chk; /* Adjust that too */ stcb->asoc.smallest_mtu = nxtsz; /* now off to subtract IP_DF flag if needed */ TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) { if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; } } TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) { /* * For this guy we also mark for immediate * resend since we sent to big of chunk */ chk->flags |= CHUNK_FLAGS_FRAGMENT_OK; if (chk->sent != SCTP_DATAGRAM_RESEND) stcb->asoc.sent_queue_retran_cnt++; chk->sent = SCTP_DATAGRAM_RESEND; chk->rec.data.doing_fast_retransmit = 0; chk->sent = SCTP_DATAGRAM_RESEND; /* Clear any time so NO RTT is being done */ chk->sent_rcv_time.tv_sec = 0; chk->sent_rcv_time.tv_usec = 0; stcb->asoc.total_flight -= chk->send_size; net->flight_size -= chk->send_size; } } } sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL); out: if (stcb) { SCTP_TCB_UNLOCK(stcb); } } void sctp6_notify(struct sctp_inpcb *inp, struct icmp6_hdr *icmph, struct sctphdr *sh, struct sockaddr *to, struct sctp_tcb *stcb, struct sctp_nets *net) { #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) struct socket *so; #endif /* protection */ int reason; if ((inp == NULL) || (stcb == NULL) || (net == NULL) || (sh == NULL) || (to == NULL)) { if (stcb) SCTP_TCB_UNLOCK(stcb); return; } /* First job is to verify the vtag matches what I would send */ if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) { SCTP_TCB_UNLOCK(stcb); return; } if (icmph->icmp6_type != ICMP_UNREACH) { /* We only care about unreachable */ SCTP_TCB_UNLOCK(stcb); return; } if ((icmph->icmp6_code == ICMP_UNREACH_NET) || (icmph->icmp6_code == ICMP_UNREACH_HOST) || (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) || (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) || (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) || (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) || (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) || (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) { /* * Hmm reachablity problems we must examine closely. If its * not reachable, we may have lost a network. Or if there is * NO protocol at the other end named SCTP. well we consider * it a OOTB abort. */ if (net->dest_state & SCTP_ADDR_REACHABLE) { /* Ok that destination is NOT reachable */ SCTP_PRINTF("ICMP (thresh %d/%d) takes interface %p down\n", net->error_count, net->failure_threshold, net); net->dest_state &= ~SCTP_ADDR_REACHABLE; net->dest_state |= SCTP_ADDR_NOT_REACHABLE; /* * JRS 5/14/07 - If a destination is unreachable, * the PF bit is turned off. This allows an * unambiguous use of the PF bit for destinations * that are reachable but potentially failed. If the * destination is set to the unreachable state, also * set the destination to the PF state. */ /* * Add debug message here if destination is not in * PF state. */ /* Stop any running T3 timers here? */ if ((stcb->asoc.sctp_cmt_on_off > 0) && (stcb->asoc.sctp_cmt_pf > 0)) { net->dest_state &= ~SCTP_ADDR_PF; SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n", net); } net->error_count = net->failure_threshold + 1; sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN, stcb, SCTP_FAILED_THRESHOLD, (void *)net, SCTP_SO_NOT_LOCKED); } SCTP_TCB_UNLOCK(stcb); } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) || (icmph->icmp6_code == ICMP_UNREACH_PORT)) { /* * Here the peer is either playing tricks on us, including * an address that belongs to someone who does not support * SCTP OR was a userland implementation that shutdown and * now is dead. In either case treat it like a OOTB abort * with no TCB */ reason = SCTP_PEER_FAULTY; sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED); #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) so = SCTP_INP_SO(inp); atomic_add_int(&stcb->asoc.refcnt, 1); SCTP_TCB_UNLOCK(stcb); SCTP_SOCKET_LOCK(so, 1); SCTP_TCB_LOCK(stcb); atomic_subtract_int(&stcb->asoc.refcnt, 1); #endif (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2); #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) SCTP_SOCKET_UNLOCK(so, 1); /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */ #endif /* no need to unlock here, since the TCB is gone */ } else { SCTP_TCB_UNLOCK(stcb); } } void sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d) { struct sctphdr sh; struct ip6ctlparam *ip6cp = NULL; uint32_t vrf_id; vrf_id = SCTP_DEFAULT_VRFID; if (pktdst->sa_family != AF_INET6 || pktdst->sa_len != sizeof(struct sockaddr_in6)) return; if ((unsigned)cmd >= PRC_NCMDS) return; if (PRC_IS_REDIRECT(cmd)) { d = NULL; } else if (inet6ctlerrmap[cmd] == 0) { return; } /* if the parameter is from icmp6, decode it. */ if (d != NULL) { ip6cp = (struct ip6ctlparam *)d; } else { ip6cp = (struct ip6ctlparam *)NULL; } if (ip6cp) { /* * XXX: We assume that when IPV6 is non NULL, M and OFF are * valid. */ /* check if we can safely examine src and dst ports */ struct sctp_inpcb *inp = NULL; struct sctp_tcb *stcb = NULL; struct sctp_nets *net = NULL; struct sockaddr_in6 final; if (ip6cp->ip6c_m == NULL) return; bzero(&sh, sizeof(sh)); bzero(&final, sizeof(final)); inp = NULL; net = NULL; m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh), (caddr_t)&sh); ip6cp->ip6c_src->sin6_port = sh.src_port; final.sin6_len = sizeof(final); final.sin6_family = AF_INET6; final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr; final.sin6_port = sh.dest_port; stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src, (struct sockaddr *)&final, &inp, &net, 1, vrf_id); /* inp's ref-count increased && stcb locked */ if (stcb != NULL && inp && (inp->sctp_socket != NULL)) { if (cmd == PRC_MSGSIZE) { sctp6_notify_mbuf(inp, ip6cp->ip6c_icmp6, &sh, stcb, net); /* inp's ref-count reduced && stcb unlocked */ } else { sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh, (struct sockaddr *)&final, stcb, net); /* inp's ref-count reduced && stcb unlocked */ } } else { if (PRC_IS_REDIRECT(cmd) && inp) { in6_rtchange((struct in6pcb *)inp, inet6ctlerrmap[cmd]); } if (inp) { /* reduce inp's ref-count */ SCTP_INP_WLOCK(inp); SCTP_INP_DECR_REF(inp); SCTP_INP_WUNLOCK(inp); } if (stcb) SCTP_TCB_UNLOCK(stcb); } } } /* * this routine can probably be collasped into the one in sctp_userreq.c * since they do the same thing and now we lookup with a sockaddr */ static int sctp6_getcred(SYSCTL_HANDLER_ARGS) { struct xucred xuc; struct sockaddr_in6 addrs[2]; struct sctp_inpcb *inp; struct sctp_nets *net; struct sctp_tcb *stcb; int error; uint32_t vrf_id; vrf_id = SCTP_DEFAULT_VRFID; error = priv_check(req->td, PRIV_NETINET_GETCRED); if (error) return (error); if (req->newlen != sizeof(addrs)) { SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return (EINVAL); } if (req->oldlen != sizeof(struct ucred)) { SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return (EINVAL); } error = SYSCTL_IN(req, addrs, sizeof(addrs)); if (error) return (error); stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]), sin6tosa(&addrs[1]), &inp, &net, 1, vrf_id); if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) { if ((inp != NULL) && (stcb == NULL)) { /* reduce ref-count */ SCTP_INP_WLOCK(inp); SCTP_INP_DECR_REF(inp); goto cred_can_cont; } SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); error = ENOENT; goto out; } SCTP_TCB_UNLOCK(stcb); /* * We use the write lock here, only since in the error leg we need * it. If we used RLOCK, then we would have to * wlock/decr/unlock/rlock. Which in theory could create a hole. * Better to use higher wlock. */ SCTP_INP_WLOCK(inp); cred_can_cont: error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket); if (error) { SCTP_INP_WUNLOCK(inp); goto out; } cru2x(inp->sctp_socket->so_cred, &xuc); SCTP_INP_WUNLOCK(inp); error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); out: return (error); } SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW, 0, 0, sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection"); /* This is the same as the sctp_abort() could be made common */ static void sctp6_abort(struct socket *so) { struct sctp_inpcb *inp; uint32_t flags; inp = (struct sctp_inpcb *)so->so_pcb; if (inp == 0) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return; } sctp_must_try_again: flags = inp->sctp_flags; #ifdef SCTP_LOG_CLOSING sctp_log_closing(inp, NULL, 17); #endif if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) && (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) { #ifdef SCTP_LOG_CLOSING sctp_log_closing(inp, NULL, 16); #endif sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT, SCTP_CALLED_AFTER_CMPSET_OFCLOSE); SOCK_LOCK(so); SCTP_SB_CLEAR(so->so_snd); /* * same for the rcv ones, they are only here for the * accounting/select. */ SCTP_SB_CLEAR(so->so_rcv); /* Now null out the reference, we are completely detached. */ so->so_pcb = NULL; SOCK_UNLOCK(so); } else { flags = inp->sctp_flags; if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) { goto sctp_must_try_again; } } return; } static int sctp6_attach(struct socket *so, int proto, struct thread *p) { struct in6pcb *inp6; int error; struct sctp_inpcb *inp; uint32_t vrf_id = SCTP_DEFAULT_VRFID; inp = (struct sctp_inpcb *)so->so_pcb; if (inp != NULL) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace)); if (error) return error; } error = sctp_inpcb_alloc(so, vrf_id); if (error) return error; inp = (struct sctp_inpcb *)so->so_pcb; SCTP_INP_WLOCK(inp); inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */ inp6 = (struct in6pcb *)inp; inp6->inp_vflag |= INP_IPV6; inp6->in6p_hops = -1; /* use kernel default */ inp6->in6p_cksum = -1; /* just to be sure */ #ifdef INET /* * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6 * socket as well, because the socket may be bound to an IPv6 * wildcard address, which may match an IPv4-mapped IPv6 address. */ inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl); #endif /* * Hmm what about the IPSEC stuff that is missing here but in * sctp_attach()? */ SCTP_INP_WUNLOCK(inp); return 0; } static int sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p) { struct sctp_inpcb *inp; struct in6pcb *inp6; int error; inp = (struct sctp_inpcb *)so->so_pcb; if (inp == 0) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } if (addr) { if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } } inp6 = (struct in6pcb *)inp; inp6->inp_vflag &= ~INP_IPV4; inp6->inp_vflag |= INP_IPV6; if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) { if (addr->sa_family == AF_INET) { /* binding v4 addr to v6 socket, so reset flags */ inp6->inp_vflag |= INP_IPV4; inp6->inp_vflag &= ~INP_IPV6; } else { struct sockaddr_in6 *sin6_p; sin6_p = (struct sockaddr_in6 *)addr; if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) { inp6->inp_vflag |= INP_IPV4; } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { struct sockaddr_in sin; in6_sin6_2_sin(&sin, sin6_p); inp6->inp_vflag |= INP_IPV4; inp6->inp_vflag &= ~INP_IPV6; error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p); return error; } } } else if (addr != NULL) { /* IPV6_V6ONLY socket */ if (addr->sa_family == AF_INET) { /* can't bind v4 addr to v6 only socket! */ SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } else { struct sockaddr_in6 *sin6_p; sin6_p = (struct sockaddr_in6 *)addr; if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { /* can't bind v4-mapped addrs either! */ /* NOTE: we don't support SIIT */ SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } } } error = sctp_inpcb_bind(so, addr, NULL, p); return error; } static void sctp6_close(struct socket *so) { sctp_close(so); } /* This could be made common with sctp_detach() since they are identical */ static int sctp6_disconnect(struct socket *so) { return (sctp_disconnect(so)); } int sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, struct mbuf *control, struct thread *p); static int sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, struct mbuf *control, struct thread *p) { struct sctp_inpcb *inp; struct in6pcb *inp6; #ifdef INET struct sockaddr_in6 *sin6; #endif /* INET */ /* No SPL needed since sctp_output does this */ inp = (struct sctp_inpcb *)so->so_pcb; if (inp == NULL) { if (control) { SCTP_RELEASE_PKT(control); control = NULL; } SCTP_RELEASE_PKT(m); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } inp6 = (struct in6pcb *)inp; /* * For the TCP model we may get a NULL addr, if we are a connected * socket thats ok. */ if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) && (addr == NULL)) { goto connected_type; } if (addr == NULL) { SCTP_RELEASE_PKT(m); if (control) { SCTP_RELEASE_PKT(control); control = NULL; } SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ); return (EDESTADDRREQ); } #ifdef INET sin6 = (struct sockaddr_in6 *)addr; if (SCTP_IPV6_V6ONLY(inp6)) { /* * if IPV6_V6ONLY flag, we discard datagrams destined to a * v4 addr or v4-mapped addr */ if (addr->sa_family == AF_INET) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } } if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { if (!MODULE_GLOBAL(ip6_v6only)) { struct sockaddr_in sin; /* convert v4-mapped into v4 addr and send */ in6_sin6_2_sin(&sin, sin6); return sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p); } else { /* mapped addresses aren't enabled */ SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } } #endif /* INET */ connected_type: /* now what about control */ if (control) { if (inp->control) { SCTP_PRINTF("huh? control set?\n"); SCTP_RELEASE_PKT(inp->control); inp->control = NULL; } inp->control = control; } /* Place the data */ if (inp->pkt) { SCTP_BUF_NEXT(inp->pkt_last) = m; inp->pkt_last = m; } else { inp->pkt_last = inp->pkt = m; } if ( /* FreeBSD and MacOSX uses a flag passed */ ((flags & PRUS_MORETOCOME) == 0) ) { /* * note with the current version this code will only be used * by OpenBSD, NetBSD and FreeBSD have methods for * re-defining sosend() to use sctp_sosend(). One can * optionaly switch back to this code (by changing back the * defininitions but this is not advisable. */ int ret; ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags); inp->pkt = NULL; inp->control = NULL; return (ret); } else { return (0); } } static int sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p) { uint32_t vrf_id; int error = 0; struct sctp_inpcb *inp; struct in6pcb *inp6; struct sctp_tcb *stcb; #ifdef INET struct sockaddr_in6 *sin6; struct sockaddr_storage ss; #endif /* INET */ inp6 = (struct in6pcb *)so->so_pcb; inp = (struct sctp_inpcb *)so->so_pcb; if (inp == 0) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); return (ECONNRESET); /* I made the same as TCP since we are * not setup? */ } if (addr == NULL) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return (EINVAL); } if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return (EINVAL); } if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return (EINVAL); } vrf_id = inp->def_vrf_id; SCTP_ASOC_CREATE_LOCK(inp); SCTP_INP_RLOCK(inp); if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == SCTP_PCB_FLAGS_UNBOUND) { /* Bind a ephemeral port */ SCTP_INP_RUNLOCK(inp); error = sctp6_bind(so, NULL, p); if (error) { SCTP_ASOC_CREATE_UNLOCK(inp); return (error); } SCTP_INP_RLOCK(inp); } if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) { /* We are already connected AND the TCP model */ SCTP_INP_RUNLOCK(inp); SCTP_ASOC_CREATE_UNLOCK(inp); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE); return (EADDRINUSE); } #ifdef INET sin6 = (struct sockaddr_in6 *)addr; if (SCTP_IPV6_V6ONLY(inp6)) { /* * if IPV6_V6ONLY flag, ignore connections destined to a v4 * addr or v4-mapped addr */ if (addr->sa_family == AF_INET) { SCTP_INP_RUNLOCK(inp); SCTP_ASOC_CREATE_UNLOCK(inp); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { SCTP_INP_RUNLOCK(inp); SCTP_ASOC_CREATE_UNLOCK(inp); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } } if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { if (!MODULE_GLOBAL(ip6_v6only)) { /* convert v4-mapped into v4 addr */ in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6); addr = (struct sockaddr *)&ss; } else { /* mapped addresses aren't enabled */ SCTP_INP_RUNLOCK(inp); SCTP_ASOC_CREATE_UNLOCK(inp); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } } else #endif /* INET */ addr = addr; /* for true v6 address case */ /* Now do we connect? */ if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { stcb = LIST_FIRST(&inp->sctp_asoc_list); if (stcb) { SCTP_TCB_UNLOCK(stcb); } SCTP_INP_RUNLOCK(inp); } else { SCTP_INP_RUNLOCK(inp); SCTP_INP_WLOCK(inp); SCTP_INP_INCR_REF(inp); SCTP_INP_WUNLOCK(inp); stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL); if (stcb == NULL) { SCTP_INP_WLOCK(inp); SCTP_INP_DECR_REF(inp); SCTP_INP_WUNLOCK(inp); } } if (stcb != NULL) { /* Already have or am bring up an association */ SCTP_ASOC_CREATE_UNLOCK(inp); SCTP_TCB_UNLOCK(stcb); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY); return (EALREADY); } /* We are GOOD to go */ stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p); SCTP_ASOC_CREATE_UNLOCK(inp); if (stcb == NULL) { /* Gak! no memory */ return (error); } if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; /* Set the connected flag so we can queue data */ soisconnecting(so); } stcb->asoc.state = SCTP_STATE_COOKIE_WAIT; (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); /* initialize authentication parameters for the assoc */ sctp_initialize_auth_params(inp, stcb); sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED); SCTP_TCB_UNLOCK(stcb); return error; } static int sctp6_getaddr(struct socket *so, struct sockaddr **addr) { struct sockaddr_in6 *sin6; struct sctp_inpcb *inp; uint32_t vrf_id; struct sctp_ifa *sctp_ifa; int error; /* * Do the malloc first in case it blocks. */ SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); if (sin6 == NULL) return ENOMEM; sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(*sin6); inp = (struct sctp_inpcb *)so->so_pcb; if (inp == NULL) { SCTP_FREE_SONAME(sin6); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); return ECONNRESET; } SCTP_INP_RLOCK(inp); sin6->sin6_port = inp->sctp_lport; if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { /* For the bound all case you get back 0 */ if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) { struct sctp_tcb *stcb; struct sockaddr_in6 *sin_a6; struct sctp_nets *net; int fnd; stcb = LIST_FIRST(&inp->sctp_asoc_list); if (stcb == NULL) { goto notConn6; } fnd = 0; sin_a6 = NULL; TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; if (sin_a6 == NULL) /* this will make coverity happy */ continue; if (sin_a6->sin6_family == AF_INET6) { fnd = 1; break; } } if ((!fnd) || (sin_a6 == NULL)) { /* punt */ goto notConn6; } vrf_id = inp->def_vrf_id; sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id); if (sctp_ifa) { sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr; } } else { /* For the bound all case you get back 0 */ notConn6: memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr)); } } else { /* Take the first IPv6 address in the list */ struct sctp_laddr *laddr; int fnd = 0; LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) { if (laddr->ifa->address.sa.sa_family == AF_INET6) { struct sockaddr_in6 *sin_a; sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6; sin6->sin6_addr = sin_a->sin6_addr; fnd = 1; break; } } if (!fnd) { SCTP_FREE_SONAME(sin6); SCTP_INP_RUNLOCK(inp); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); return ENOENT; } } SCTP_INP_RUNLOCK(inp); /* Scoping things for v6 */ if ((error = sa6_recoverscope(sin6)) != 0) { SCTP_FREE_SONAME(sin6); return (error); } (*addr) = (struct sockaddr *)sin6; return (0); } static int sctp6_peeraddr(struct socket *so, struct sockaddr **addr) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr; int fnd; struct sockaddr_in6 *sin_a6; struct sctp_inpcb *inp; struct sctp_tcb *stcb; struct sctp_nets *net; int error; /* * Do the malloc first in case it blocks. */ inp = (struct sctp_inpcb *)so->so_pcb; if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) { /* UDP type and listeners will drop out here */ SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN); return (ENOTCONN); } SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6); if (sin6 == NULL) return (ENOMEM); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(*sin6); /* We must recapture incase we blocked */ inp = (struct sctp_inpcb *)so->so_pcb; if (inp == NULL) { SCTP_FREE_SONAME(sin6); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); return ECONNRESET; } SCTP_INP_RLOCK(inp); stcb = LIST_FIRST(&inp->sctp_asoc_list); if (stcb) { SCTP_TCB_LOCK(stcb); } SCTP_INP_RUNLOCK(inp); if (stcb == NULL) { SCTP_FREE_SONAME(sin6); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET); return ECONNRESET; } fnd = 0; TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr; if (sin_a6->sin6_family == AF_INET6) { fnd = 1; sin6->sin6_port = stcb->rport; sin6->sin6_addr = sin_a6->sin6_addr; break; } } SCTP_TCB_UNLOCK(stcb); if (!fnd) { /* No IPv4 address */ SCTP_FREE_SONAME(sin6); SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT); return ENOENT; } if ((error = sa6_recoverscope(sin6)) != 0) return (error); *addr = (struct sockaddr *)sin6; return (0); } static int sctp6_in6getaddr(struct socket *so, struct sockaddr **nam) { struct sockaddr *addr; struct in6pcb *inp6 = sotoin6pcb(so); int error; if (inp6 == NULL) { SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } /* allow v6 addresses precedence */ error = sctp6_getaddr(so, nam); if (error) { /* try v4 next if v6 failed */ error = sctp_ingetaddr(so, nam); if (error) { return (error); } addr = *nam; /* if I'm V6ONLY, convert it to v4-mapped */ if (SCTP_IPV6_V6ONLY(inp6)) { struct sockaddr_in6 sin6; in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); } } return (error); } static int sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam) { struct sockaddr *addr = *nam; struct in6pcb *inp6 = sotoin6pcb(so); int error; if (inp6 == NULL) { SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL); return EINVAL; } /* allow v6 addresses precedence */ error = sctp6_peeraddr(so, nam); if (error) { /* try v4 next if v6 failed */ error = sctp_peeraddr(so, nam); if (error) { return (error); } /* if I'm V6ONLY, convert it to v4-mapped */ if (SCTP_IPV6_V6ONLY(inp6)) { struct sockaddr_in6 sin6; in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6); memcpy(addr, &sin6, sizeof(struct sockaddr_in6)); } } return error; } struct pr_usrreqs sctp6_usrreqs = { .pru_abort = sctp6_abort, .pru_accept = sctp_accept, .pru_attach = sctp6_attach, .pru_bind = sctp6_bind, .pru_connect = sctp6_connect, .pru_control = in6_control, .pru_close = sctp6_close, .pru_detach = sctp6_close, .pru_sopoll = sopoll_generic, .pru_flush = sctp_flush, .pru_disconnect = sctp6_disconnect, .pru_listen = sctp_listen, .pru_peeraddr = sctp6_getpeeraddr, .pru_send = sctp6_send, .pru_shutdown = sctp_shutdown, .pru_sockaddr = sctp6_in6getaddr, .pru_sosend = sctp_sosend, .pru_soreceive = sctp_soreceive };