/*- * Copyright (c) 2001-2006, 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: sctp_asconf.c,v 1.24 2005/03/06 16:04:16 itojun Exp $ */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include /* * debug flags: * SCTP_DEBUG_ASCONF1: protocol info, general info and errors * SCTP_DEBUG_ASCONF2: detailed info */ #ifdef SCTP_DEBUG extern uint32_t sctp_debug_on; #endif /* SCTP_DEBUG */ static int sctp_asconf_get_source_ip(struct mbuf *m, struct sockaddr *sa) { struct ip *iph; struct sockaddr_in *sin; #ifdef INET6 struct sockaddr_in6 *sin6; #endif iph = mtod(m, struct ip *); if (iph->ip_v == IPVERSION) { /* IPv4 source */ sin = (struct sockaddr_in *)sa; bzero(sin, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(struct sockaddr_in); sin->sin_port = 0; sin->sin_addr.s_addr = iph->ip_src.s_addr; return 0; } #ifdef INET6 else if (iph->ip_v == (IPV6_VERSION >> 4)) { /* IPv6 source */ struct ip6_hdr *ip6; sin6 = (struct sockaddr_in6 *)sa; bzero(sin6, sizeof(*sin6)); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(struct sockaddr_in6); sin6->sin6_port = 0; ip6 = mtod(m, struct ip6_hdr *); sin6->sin6_addr = ip6->ip6_src; return 0; } #endif /* INET6 */ else return -1; } /* * draft-ietf-tsvwg-addip-sctp * * Address management only currently supported For the bound all case: the asoc * local addr list is always a "DO NOT USE" list For the subset bound case: * If ASCONFs are allowed: the endpoint local addr list is the usable address * list the asoc local addr list is the "DO NOT USE" list If ASCONFs are not * allowed: the endpoint local addr list is the default usable list the asoc * local addr list is the usable address list * * An ASCONF parameter queue exists per asoc which holds the pending address * operations. Lists are updated upon receipt of ASCONF-ACK. * * Deleted addresses are always immediately removed from the lists as they will * (shortly) no longer exist in the kernel. We send ASCONFs as a courtesy, * only if allowed. */ /* * ASCONF parameter processing response_required: set if a reply is required * (eg. SUCCESS_REPORT) returns a mbuf to an "error" response parameter or * NULL/"success" if ok FIX: allocating this many mbufs on the fly is pretty * inefficient... */ static struct mbuf * sctp_asconf_success_response(uint32_t id) { struct mbuf *m_reply = NULL; struct sctp_asconf_paramhdr *aph; m_reply = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_paramhdr), 0, M_DONTWAIT, 1, MT_DATA); if (m_reply == NULL) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("asconf_success_response: couldn't get mbuf!\n"); } #endif /* SCTP_DEBUG */ return NULL; } aph = mtod(m_reply, struct sctp_asconf_paramhdr *); aph->correlation_id = id; aph->ph.param_type = htons(SCTP_SUCCESS_REPORT); aph->ph.param_length = sizeof(struct sctp_asconf_paramhdr); SCTP_BUF_LEN(m_reply) = aph->ph.param_length; aph->ph.param_length = htons(aph->ph.param_length); return m_reply; } static struct mbuf * sctp_asconf_error_response(uint32_t id, uint16_t cause, uint8_t * error_tlv, uint16_t tlv_length) { struct mbuf *m_reply = NULL; struct sctp_asconf_paramhdr *aph; struct sctp_error_cause *error; uint8_t *tlv; m_reply = sctp_get_mbuf_for_msg((sizeof(struct sctp_asconf_paramhdr) + tlv_length + sizeof(struct sctp_error_cause)), 0, M_DONTWAIT, 1, MT_DATA); if (m_reply == NULL) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("asconf_error_response: couldn't get mbuf!\n"); } #endif /* SCTP_DEBUG */ return NULL; } aph = mtod(m_reply, struct sctp_asconf_paramhdr *); error = (struct sctp_error_cause *)(aph + 1); aph->correlation_id = id; aph->ph.param_type = htons(SCTP_ERROR_CAUSE_IND); error->code = htons(cause); error->length = tlv_length + sizeof(struct sctp_error_cause); aph->ph.param_length = error->length + sizeof(struct sctp_asconf_paramhdr); if (aph->ph.param_length > MLEN) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("asconf_error_response: tlv_length (%xh) too big\n", tlv_length); } #endif /* SCTP_DEBUG */ sctp_m_freem(m_reply); /* discard */ return NULL; } if (error_tlv != NULL) { tlv = (uint8_t *) (error + 1); memcpy(tlv, error_tlv, tlv_length); } SCTP_BUF_LEN(m_reply) = aph->ph.param_length; error->length = htons(error->length); aph->ph.param_length = htons(aph->ph.param_length); return m_reply; } static struct mbuf * sctp_process_asconf_add_ip(struct mbuf *m, struct sctp_asconf_paramhdr *aph, struct sctp_tcb *stcb, int response_required) { struct mbuf *m_reply = NULL; struct sockaddr_storage sa_source, sa_store; struct sctp_ipv4addr_param *v4addr; uint16_t param_type, param_length, aparam_length; struct sockaddr *sa; struct sockaddr_in *sin; int zero_address = 0; #ifdef INET6 struct sockaddr_in6 *sin6; struct sctp_ipv6addr_param *v6addr; #endif /* INET6 */ aparam_length = ntohs(aph->ph.param_length); v4addr = (struct sctp_ipv4addr_param *)(aph + 1); #ifdef INET6 v6addr = (struct sctp_ipv6addr_param *)(aph + 1); #endif /* INET6 */ param_type = ntohs(v4addr->ph.param_type); param_length = ntohs(v4addr->ph.param_length); sa = (struct sockaddr *)&sa_store; switch (param_type) { case SCTP_IPV4_ADDRESS: if (param_length != sizeof(struct sctp_ipv4addr_param)) { /* invalid param size */ return NULL; } sin = (struct sockaddr_in *)&sa_store; bzero(sin, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(struct sockaddr_in); sin->sin_port = stcb->rport; sin->sin_addr.s_addr = v4addr->addr; if (sin->sin_addr.s_addr == INADDR_ANY) zero_address = 1; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_add_ip: adding "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ break; case SCTP_IPV6_ADDRESS: #ifdef INET6 if (param_length != sizeof(struct sctp_ipv6addr_param)) { /* invalid param size */ return NULL; } sin6 = (struct sockaddr_in6 *)&sa_store; bzero(sin6, sizeof(*sin6)); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(struct sockaddr_in6); sin6->sin6_port = stcb->rport; memcpy((caddr_t)&sin6->sin6_addr, v6addr->addr, sizeof(struct in6_addr)); if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) zero_address = 1; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_add_ip: adding "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ #else /* IPv6 not enabled! */ /* FIX ME: currently sends back an invalid param error */ m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_INVALID_PARAM, (uint8_t *) aph, aparam_length); #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_add_ip: v6 disabled- skipping "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ return m_reply; #endif /* INET6 */ break; default: m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *) aph, aparam_length); return m_reply; } /* end switch */ /* if 0.0.0.0/::0, add the source address instead */ if (zero_address && sctp_nat_friendly) { sa = (struct sockaddr *)&sa_source; sctp_asconf_get_source_ip(m, sa); #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_add_ip: using source addr "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ } /* add the address */ if (sctp_add_remote_addr(stcb, sa, SCTP_DONOT_SETSCOPE, SCTP_ADDR_DYNAMIC_ADDED) != 0) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_add_ip: error adding address\n"); } #endif /* SCTP_DEBUG */ m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_RESOURCE_SHORTAGE, (uint8_t *) aph, aparam_length); } else { /* notify upper layer */ sctp_ulp_notify(SCTP_NOTIFY_ASCONF_ADD_IP, stcb, 0, sa); if (response_required) { m_reply = sctp_asconf_success_response(aph->correlation_id); } sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_ASCONF + SCTP_LOC_1); sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, NULL); } return m_reply; } static int sctp_asconf_del_remote_addrs_except(struct sctp_tcb *stcb, struct sockaddr *src) { struct sctp_nets *src_net, *net; /* make sure the source address exists as a destination net */ src_net = sctp_findnet(stcb, src); if (src_net == NULL) { /* not found */ return -1; } /* delete all destination addresses except the source */ TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { if (net != src_net) { /* delete this address */ sctp_remove_net(stcb, net); #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("asconf_del_remote_addrs_except: deleting "); sctp_print_address((struct sockaddr *)&net->ro._l_addr); } #endif /* notify upper layer */ sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0, (struct sockaddr *)&net->ro._l_addr); } } return 0; } static struct mbuf * sctp_process_asconf_delete_ip(struct mbuf *m, struct sctp_asconf_paramhdr *aph, struct sctp_tcb *stcb, int response_required) { struct mbuf *m_reply = NULL; struct sockaddr_storage sa_source, sa_store; struct sctp_ipv4addr_param *v4addr; uint16_t param_type, param_length, aparam_length; struct sockaddr *sa; struct sockaddr_in *sin; int zero_address = 0; int result; #ifdef INET6 struct sockaddr_in6 *sin6; struct sctp_ipv6addr_param *v6addr; #endif /* INET6 */ /* get the source IP address for src and 0.0.0.0/::0 delete checks */ sctp_asconf_get_source_ip(m, (struct sockaddr *)&sa_source); aparam_length = ntohs(aph->ph.param_length); v4addr = (struct sctp_ipv4addr_param *)(aph + 1); #ifdef INET6 v6addr = (struct sctp_ipv6addr_param *)(aph + 1); #endif /* INET6 */ param_type = ntohs(v4addr->ph.param_type); param_length = ntohs(v4addr->ph.param_length); sa = (struct sockaddr *)&sa_store; switch (param_type) { case SCTP_IPV4_ADDRESS: if (param_length != sizeof(struct sctp_ipv4addr_param)) { /* invalid param size */ return NULL; } sin = (struct sockaddr_in *)&sa_store; bzero(sin, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(struct sockaddr_in); sin->sin_port = stcb->rport; sin->sin_addr.s_addr = v4addr->addr; if (sin->sin_addr.s_addr == INADDR_ANY) zero_address = 1; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_delete_ip: deleting "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ break; case SCTP_IPV6_ADDRESS: if (param_length != sizeof(struct sctp_ipv6addr_param)) { /* invalid param size */ return NULL; } #ifdef INET6 sin6 = (struct sockaddr_in6 *)&sa_store; bzero(sin6, sizeof(*sin6)); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(struct sockaddr_in6); sin6->sin6_port = stcb->rport; memcpy(&sin6->sin6_addr, v6addr->addr, sizeof(struct in6_addr)); if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) zero_address = 1; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_delete_ip: deleting "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ #else /* IPv6 not enabled! No "action" needed; just ack it */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_delete_ip: v6 disabled- ignoring: "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ /* just respond with a "success" ASCONF-ACK */ return NULL; #endif /* INET6 */ break; default: m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *) aph, aparam_length); return m_reply; } /* make sure the source address is not being deleted */ if (sctp_cmpaddr(sa, (struct sockaddr *)&sa_source)) { /* trying to delete the source address! */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_delete_ip: tried to delete source addr\n"); } #endif /* SCTP_DEBUG */ m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_DELETING_SRC_ADDR, (uint8_t *) aph, aparam_length); return m_reply; } /* if deleting 0.0.0.0/::0, delete all addresses except src addr */ if (zero_address && sctp_nat_friendly) { result = sctp_asconf_del_remote_addrs_except(stcb, (struct sockaddr *)&sa_source); if (result) { /* src address did not exist? */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_delete_ip: src addr does not exist?\n"); } #endif /* SCTP_DEBUG */ /* what error to reply with?? */ m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_REQUEST_REFUSED, (uint8_t *) aph, aparam_length); } else if (response_required) { m_reply = sctp_asconf_success_response(aph->correlation_id); } return m_reply; } /* delete the address */ result = sctp_del_remote_addr(stcb, sa); /* * note if result == -2, the address doesn't exist in the asoc but * since it's being deleted anyways, we just ack the delete -- but * this probably means something has already gone awry */ if (result == -1) { /* only one address in the asoc */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_delete_ip: tried to delete last IP addr!\n"); } #endif /* SCTP_DEBUG */ m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_DELETING_LAST_ADDR, (uint8_t *) aph, aparam_length); } else { if (response_required) { m_reply = sctp_asconf_success_response(aph->correlation_id); } /* notify upper layer */ sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0, sa); } return m_reply; } static struct mbuf * sctp_process_asconf_set_primary(struct mbuf *m, struct sctp_asconf_paramhdr *aph, struct sctp_tcb *stcb, int response_required) { struct mbuf *m_reply = NULL; struct sockaddr_storage sa_source, sa_store; struct sctp_ipv4addr_param *v4addr; uint16_t param_type, param_length, aparam_length; struct sockaddr *sa; struct sockaddr_in *sin; int zero_address = 0; #ifdef INET6 struct sockaddr_in6 *sin6; struct sctp_ipv6addr_param *v6addr; #endif /* INET6 */ aparam_length = ntohs(aph->ph.param_length); v4addr = (struct sctp_ipv4addr_param *)(aph + 1); #ifdef INET6 v6addr = (struct sctp_ipv6addr_param *)(aph + 1); #endif /* INET6 */ param_type = ntohs(v4addr->ph.param_type); param_length = ntohs(v4addr->ph.param_length); sa = (struct sockaddr *)&sa_store; switch (param_type) { case SCTP_IPV4_ADDRESS: if (param_length != sizeof(struct sctp_ipv4addr_param)) { /* invalid param size */ return NULL; } sin = (struct sockaddr_in *)&sa_store; bzero(sin, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(struct sockaddr_in); sin->sin_addr.s_addr = v4addr->addr; if (sin->sin_addr.s_addr == INADDR_ANY) zero_address = 1; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_set_primary: "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ break; case SCTP_IPV6_ADDRESS: if (param_length != sizeof(struct sctp_ipv6addr_param)) { /* invalid param size */ return NULL; } #ifdef INET6 sin6 = (struct sockaddr_in6 *)&sa_store; bzero(sin6, sizeof(*sin6)); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(struct sockaddr_in6); memcpy((caddr_t)&sin6->sin6_addr, v6addr->addr, sizeof(struct in6_addr)); if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) zero_address = 1; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_set_primary: "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ #else /* IPv6 not enabled! No "action" needed; just ack it */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_set_primary: v6 disabled- ignoring: "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ /* just respond with a "success" ASCONF-ACK */ return NULL; #endif /* INET6 */ break; default: m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *) aph, aparam_length); return m_reply; } /* if 0.0.0.0/::0, use the source address instead */ if (zero_address && sctp_nat_friendly) { sa = (struct sockaddr *)&sa_source; sctp_asconf_get_source_ip(m, sa); #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_set_primary: using source addr "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ } /* set the primary address */ if (sctp_set_primary_addr(stcb, sa, NULL) == 0) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_set_primary: primary address set\n"); } #endif /* SCTP_DEBUG */ /* notify upper layer */ sctp_ulp_notify(SCTP_NOTIFY_ASCONF_SET_PRIMARY, stcb, 0, sa); if (response_required) { m_reply = sctp_asconf_success_response(aph->correlation_id); } } else { /* couldn't set the requested primary address! */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_asconf_set_primary: set primary failed!\n"); } #endif /* SCTP_DEBUG */ /* must have been an invalid address, so report */ m_reply = sctp_asconf_error_response(aph->correlation_id, SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *) aph, aparam_length); } return m_reply; } /* * handles an ASCONF chunk. * if all parameters are processed ok, send a plain (empty) ASCONF-ACK */ void sctp_handle_asconf(struct mbuf *m, unsigned int offset, struct sctp_asconf_chunk *cp, struct sctp_tcb *stcb) { struct sctp_association *asoc; uint32_t serial_num; struct mbuf *m_ack, *m_result, *m_tail; struct sctp_asconf_ack_chunk *ack_cp; struct sctp_asconf_paramhdr *aph, *ack_aph; struct sctp_ipv6addr_param *p_addr; unsigned int asconf_limit; int error = 0; /* did an error occur? */ /* asconf param buffer */ static uint8_t aparam_buf[DEFAULT_PARAM_BUFFER]; /* verify minimum length */ if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_chunk)) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: chunk too small = %xh\n", ntohs(cp->ch.chunk_length)); } #endif /* SCTP_DEBUG */ return; } asoc = &stcb->asoc; serial_num = ntohl(cp->serial_number); if (serial_num == asoc->asconf_seq_in) { /* got a duplicate ASCONF */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: got duplicate serial number = %xh\n", serial_num); } #endif /* SCTP_DEBUG */ /* resend last ASCONF-ACK... */ sctp_send_asconf_ack(stcb, 1); return; } else if (serial_num != (asoc->asconf_seq_in + 1)) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: incorrect serial number = %xh (expected next = %xh)\n", serial_num, asoc->asconf_seq_in + 1); } #endif /* SCTP_DEBUG */ return; } /* it's the expected "next" sequence number, so process it */ asoc->asconf_seq_in = serial_num; /* update sequence */ /* get length of all the param's in the ASCONF */ asconf_limit = offset + ntohs(cp->ch.chunk_length); #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: asconf_limit=%u, sequence=%xh\n", asconf_limit, serial_num); } #endif /* SCTP_DEBUG */ if (asoc->last_asconf_ack_sent != NULL) { /* free last ASCONF-ACK message sent */ sctp_m_freem(asoc->last_asconf_ack_sent); asoc->last_asconf_ack_sent = NULL; } m_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_ack_chunk), 0, M_DONTWAIT, 1, MT_DATA); if (m_ack == NULL) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: couldn't get mbuf!\n"); } #endif /* SCTP_DEBUG */ return; } m_tail = m_ack; /* current reply chain's tail */ /* fill in ASCONF-ACK header */ ack_cp = mtod(m_ack, struct sctp_asconf_ack_chunk *); ack_cp->ch.chunk_type = SCTP_ASCONF_ACK; ack_cp->ch.chunk_flags = 0; ack_cp->serial_number = htonl(serial_num); /* set initial lengths (eg. just an ASCONF-ACK), ntohx at the end! */ SCTP_BUF_LEN(m_ack) = sizeof(struct sctp_asconf_ack_chunk); ack_cp->ch.chunk_length = sizeof(struct sctp_asconf_ack_chunk); /* skip the lookup address parameter */ offset += sizeof(struct sctp_asconf_chunk); p_addr = (struct sctp_ipv6addr_param *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), (uint8_t *) & aparam_buf); if (p_addr == NULL) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: couldn't get lookup addr!\n"); } #endif /* SCTP_DEBUG */ /* respond with a missing/invalid mandatory parameter error */ return; } /* param_length is already validated in process_control... */ offset += ntohs(p_addr->ph.param_length); /* skip lookup addr */ /* get pointer to first asconf param in ASCONF-ACK */ ack_aph = (struct sctp_asconf_paramhdr *)(mtod(m_ack, caddr_t)+sizeof(struct sctp_asconf_ack_chunk)); if (ack_aph == NULL) { #ifdef SCTP_DEBUG printf("Gak in asconf2\n"); #endif return; } /* get pointer to first asconf param in ASCONF */ aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_asconf_paramhdr), (uint8_t *) & aparam_buf); if (aph == NULL) { #ifdef SCTP_DEBUG printf("Empty ASCONF received?\n"); #endif goto send_reply; } /* process through all parameters */ while (aph != NULL) { unsigned int param_length, param_type; param_type = ntohs(aph->ph.param_type); param_length = ntohs(aph->ph.param_length); if (offset + param_length > asconf_limit) { /* parameter goes beyond end of chunk! */ sctp_m_freem(m_ack); return; } m_result = NULL; if (param_length > sizeof(aparam_buf)) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: param length (%u) larger than buffer size!\n", param_length); } #endif /* SCTP_DEBUG */ sctp_m_freem(m_ack); return; } if (param_length <= sizeof(struct sctp_paramhdr)) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: param length (%u) too short\n", param_length); } #endif /* SCTP_DEBUG */ sctp_m_freem(m_ack); } /* get the entire parameter */ aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf); if (aph == NULL) { #ifdef SCTP_DEBUG printf("Gag\n"); #endif sctp_m_freem(m_ack); return; } switch (param_type) { case SCTP_ADD_IP_ADDRESS: asoc->peer_supports_asconf = 1; m_result = sctp_process_asconf_add_ip(m, aph, stcb, error); break; case SCTP_DEL_IP_ADDRESS: asoc->peer_supports_asconf = 1; m_result = sctp_process_asconf_delete_ip(m, aph, stcb, error); break; case SCTP_ERROR_CAUSE_IND: /* not valid in an ASCONF chunk */ break; case SCTP_SET_PRIM_ADDR: asoc->peer_supports_asconf = 1; m_result = sctp_process_asconf_set_primary(m, aph, stcb, error); break; case SCTP_SUCCESS_REPORT: /* not valid in an ASCONF chunk */ break; case SCTP_ULP_ADAPTATION: /* FIX */ break; default: if ((param_type & 0x8000) == 0) { /* Been told to STOP at this param */ asconf_limit = offset; /* * FIX FIX - We need to call * sctp_arethere_unrecognized_parameters() * to get a operr and send it for any * param's with the 0x4000 bit set OR do it * here ourselves... note we still must STOP * if the 0x8000 bit is clear. */ } /* unknown/invalid param type */ break; } /* switch */ /* add any (error) result to the reply mbuf chain */ if (m_result != NULL) { SCTP_BUF_NEXT(m_tail) = m_result; m_tail = m_result; /* update lengths, make sure it's aligned too */ SCTP_BUF_LEN(m_result) = SCTP_SIZE32(SCTP_BUF_LEN(m_result)); ack_cp->ch.chunk_length += SCTP_BUF_LEN(m_result); /* set flag to force success reports */ error = 1; } offset += SCTP_SIZE32(param_length); /* update remaining ASCONF message length to process */ if (offset >= asconf_limit) { /* no more data in the mbuf chain */ break; } /* get pointer to next asconf param */ aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_asconf_paramhdr), (uint8_t *) & aparam_buf); if (aph == NULL) { /* can't get an asconf paramhdr */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf: can't get asconf param hdr!\n"); } #endif /* SCTP_DEBUG */ /* FIX ME - add error here... */ } } /* while */ send_reply: ack_cp->ch.chunk_length = htons(ack_cp->ch.chunk_length); /* save the ASCONF-ACK reply */ asoc->last_asconf_ack_sent = m_ack; /* see if last_control_chunk_from is set properly (use IP src addr) */ if (stcb->asoc.last_control_chunk_from == NULL) { /* * this could happen if the source address was just newly * added */ struct ip *iph; struct sctphdr *sh; struct sockaddr_storage from_store; struct sockaddr *from = (struct sockaddr *)&from_store; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) printf("handle_asconf: looking up net for IP source address\n"); #endif /* SCTP_DEBUG */ /* pullup already done, IP options already stripped */ iph = mtod(m, struct ip *); sh = (struct sctphdr *)((caddr_t)iph + sizeof(*iph)); if (iph->ip_v == IPVERSION) { struct sockaddr_in *from4; from4 = (struct sockaddr_in *)&from_store; bzero(from4, sizeof(*from4)); from4->sin_family = AF_INET; from4->sin_len = sizeof(struct sockaddr_in); from4->sin_addr.s_addr = iph->ip_src.s_addr; from4->sin_port = sh->src_port; } else if (iph->ip_v == (IPV6_VERSION >> 4)) { struct ip6_hdr *ip6; struct sockaddr_in6 *from6; ip6 = mtod(m, struct ip6_hdr *); from6 = (struct sockaddr_in6 *)&from_store; bzero(from6, sizeof(*from6)); from6->sin6_family = AF_INET6; from6->sin6_len = sizeof(struct sockaddr_in6); from6->sin6_addr = ip6->ip6_src; from6->sin6_port = sh->src_port; /* Get the scopes in properly to the sin6 addr's */ /* we probably don't need these operations */ (void)sa6_recoverscope(from6); sa6_embedscope(from6, ip6_use_defzone); } else { /* unknown address type */ from = NULL; } if (from != NULL) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("Looking for IP source: "); sctp_print_address(from); } #endif /* SCTP_DEBUG */ /* look up the from address */ stcb->asoc.last_control_chunk_from = sctp_findnet(stcb, from); #ifdef SCTP_DEBUG if ((stcb->asoc.last_control_chunk_from == NULL) && (sctp_debug_on & SCTP_DEBUG_ASCONF1)) printf("handle_asconf: IP source address not found?!\n"); #endif /* SCTP_DEBUG */ } } /* and send it (a new one) out... */ sctp_send_asconf_ack(stcb, 0); } /* * does the address match? returns 0 if not, 1 if so */ static uint32_t sctp_asconf_addr_match(struct sctp_asconf_addr *aa, struct sockaddr *sa) { #ifdef INET6 if (sa->sa_family == AF_INET6) { /* IPv6 sa address */ /* XXX scopeid */ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; if ((aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) && (memcmp(&aa->ap.addrp.addr, &sin6->sin6_addr, sizeof(struct in6_addr)) == 0)) { return (1); } } else #endif /* INET6 */ if (sa->sa_family == AF_INET) { /* IPv4 sa address */ struct sockaddr_in *sin = (struct sockaddr_in *)sa; if ((aa->ap.addrp.ph.param_type == SCTP_IPV4_ADDRESS) && (memcmp(&aa->ap.addrp.addr, &sin->sin_addr, sizeof(struct in_addr)) == 0)) { return (1); } } return (0); } /* * Cleanup for non-responded/OP ERR'd ASCONF */ void sctp_asconf_cleanup(struct sctp_tcb *stcb, struct sctp_nets *net) { /* mark peer as ASCONF incapable */ stcb->asoc.peer_supports_asconf = 0; /* * clear out any existing asconfs going out */ sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_ASCONF + SCTP_LOC_2); stcb->asoc.asconf_seq_out++; /* remove the old ASCONF on our outbound queue */ sctp_toss_old_asconf(stcb); } /* * process an ADD/DELETE IP ack from peer. * addr corresponding ifaddr to the address being added/deleted. * type: SCTP_ADD_IP_ADDRESS or SCTP_DEL_IP_ADDRESS. * flag: 1=success, 0=failure. */ static void sctp_asconf_addr_mgmt_ack(struct sctp_tcb *stcb, struct ifaddr *addr, uint16_t type, uint32_t flag) { /* * do the necessary asoc list work- if we get a failure indication, * leave the address on the "do not use" asoc list if we get a * success indication, remove the address from the list */ /* * Note: this will only occur for ADD_IP_ADDRESS, since * DEL_IP_ADDRESS is never actually added to the list... */ if (flag) { /* success case, so remove from the list */ sctp_del_local_addr_assoc(stcb, addr); } /* else, leave it on the list */ } /* * add an asconf add/delete IP address parameter to the queue. * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR. * returns 0 if completed, non-zero if not completed. * NOTE: if adding, but delete already scheduled (and not yet sent out), * simply remove from queue. Same for deleting an address already scheduled * for add. If a duplicate operation is found, ignore the new one. */ static uint32_t sctp_asconf_queue_add(struct sctp_tcb *stcb, struct ifaddr *ifa, uint16_t type) { struct sctp_asconf_addr *aa, *aa_next; struct sockaddr *sa; /* see if peer supports ASCONF */ if (stcb->asoc.peer_supports_asconf == 0) { return (-1); } /* make sure the request isn't already in the queue */ for (aa = TAILQ_FIRST(&stcb->asoc.asconf_queue); aa != NULL; aa = aa_next) { aa_next = TAILQ_NEXT(aa, next); /* address match? */ if (sctp_asconf_addr_match(aa, ifa->ifa_addr) == 0) continue; /* is the request already in queue (sent or not) */ if (aa->ap.aph.ph.param_type == type) { return (-1); } /* is the negative request already in queue, and not sent */ if (aa->sent == 0 && /* add requested, delete already queued */ ((type == SCTP_ADD_IP_ADDRESS && aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) || /* delete requested, add already queued */ (type == SCTP_DEL_IP_ADDRESS && aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS))) { /* delete the existing entry in the queue */ TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next); /* take the entry off the appropriate list */ sctp_asconf_addr_mgmt_ack(stcb, aa->ifa, type, 1); /* free the entry */ SCTP_FREE(aa); return (-1); } } /* for each aa */ /* adding new request to the queue */ SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa), "AsconfAddr"); if (aa == NULL) { /* didn't get memory */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("asconf_queue_add: failed to get memory!\n"); } #endif /* SCTP_DEBUG */ return (-1); } /* fill in asconf address parameter fields */ /* top level elements are "networked" during send */ aa->ap.aph.ph.param_type = type; aa->ifa = ifa; /* correlation_id filled in during send routine later... */ if (ifa->ifa_addr->sa_family == AF_INET6) { /* IPv6 address */ struct sockaddr_in6 *sin6; sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; sa = (struct sockaddr *)sin6; aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS; aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param)); aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv6addr_param); memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr, sizeof(struct in6_addr)); } else if (ifa->ifa_addr->sa_family == AF_INET) { /* IPv4 address */ struct sockaddr_in *sin = (struct sockaddr_in *)ifa->ifa_addr; sa = (struct sockaddr *)sin; aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS; aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param)); aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv4addr_param); memcpy(&aa->ap.addrp.addr, &sin->sin_addr, sizeof(struct in_addr)); } else { /* invalid family! */ return (-1); } aa->sent = 0; /* clear sent flag */ /* * if we are deleting an address it should go out last otherwise, * add it to front of the pending queue */ if (type == SCTP_ADD_IP_ADDRESS) { /* add goes to the front of the queue */ TAILQ_INSERT_HEAD(&stcb->asoc.asconf_queue, aa, next); #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF2) { printf("asconf_queue_add: appended asconf ADD_IP_ADDRESS: "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ } else { /* delete and set primary goes to the back of the queue */ TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next); #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF2) { if (type == SCTP_DEL_IP_ADDRESS) { printf("asconf_queue_add: inserted asconf DEL_IP_ADDRESS: "); sctp_print_address(sa); } else { printf("asconf_queue_add: inserted asconf SET_PRIM_ADDR: "); sctp_print_address(sa); } } #endif /* SCTP_DEBUG */ } return (0); } /* * add an asconf add/delete IP address parameter to the queue by addr. * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR. * returns 0 if completed, non-zero if not completed. * NOTE: if adding, but delete already scheduled (and not yet sent out), * simply remove from queue. Same for deleting an address already scheduled * for add. If a duplicate operation is found, ignore the new one. */ static uint32_t sctp_asconf_queue_add_sa(struct sctp_tcb *stcb, struct sockaddr *sa, uint16_t type) { struct sctp_asconf_addr *aa, *aa_next; /* see if peer supports ASCONF */ if (stcb->asoc.peer_supports_asconf == 0) { return (-1); } /* make sure the request isn't already in the queue */ for (aa = TAILQ_FIRST(&stcb->asoc.asconf_queue); aa != NULL; aa = aa_next) { aa_next = TAILQ_NEXT(aa, next); /* address match? */ if (sctp_asconf_addr_match(aa, sa) == 0) continue; /* is the request already in queue (sent or not) */ if (aa->ap.aph.ph.param_type == type) { return (-1); } /* is the negative request already in queue, and not sent */ if (aa->sent == 1) continue; if (type == SCTP_ADD_IP_ADDRESS && aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) { /* add requested, delete already queued */ /* delete the existing entry in the queue */ TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next); /* free the entry */ SCTP_FREE(aa); return (-1); } else if (type == SCTP_DEL_IP_ADDRESS && aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS) { /* delete requested, add already queued */ /* delete the existing entry in the queue */ TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next); /* take the entry off the appropriate list */ sctp_asconf_addr_mgmt_ack(stcb, aa->ifa, type, 1); /* free the entry */ SCTP_FREE(aa); return (-1); } } /* for each aa */ /* adding new request to the queue */ SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa), "AsconfAddr"); if (aa == NULL) { /* didn't get memory */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("asconf_queue_add_sa: failed to get memory!\n"); } #endif /* SCTP_DEBUG */ return (-1); } /* fill in asconf address parameter fields */ /* top level elements are "networked" during send */ aa->ap.aph.ph.param_type = type; aa->ifa = sctp_find_ifa_by_addr(sa); /* correlation_id filled in during send routine later... */ if (sa->sa_family == AF_INET6) { /* IPv6 address */ struct sockaddr_in6 *sin6; sin6 = (struct sockaddr_in6 *)sa; aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS; aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param)); aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv6addr_param); memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr, sizeof(struct in6_addr)); } else if (sa->sa_family == AF_INET) { /* IPv4 address */ struct sockaddr_in *sin = (struct sockaddr_in *)sa; aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS; aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param)); aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv4addr_param); memcpy(&aa->ap.addrp.addr, &sin->sin_addr, sizeof(struct in_addr)); } else { /* invalid family! */ SCTP_FREE(aa); return (-1); } aa->sent = 0; /* clear sent flag */ /* * if we are deleting an address it should go out last otherwise, * add it to front of the pending queue */ if (type == SCTP_ADD_IP_ADDRESS) { /* add goes to the front of the queue */ TAILQ_INSERT_HEAD(&stcb->asoc.asconf_queue, aa, next); } else { /* delete and set primary goes to the back of the queue */ TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next); } return (0); } /* * find a specific asconf param on our "sent" queue */ static struct sctp_asconf_addr * sctp_asconf_find_param(struct sctp_tcb *stcb, uint32_t correlation_id) { struct sctp_asconf_addr *aa; TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) { if (aa->ap.aph.correlation_id == correlation_id && aa->sent == 1) { /* found it */ return (aa); } } /* didn't find it */ return (NULL); } /* * process an SCTP_ERROR_CAUSE_IND for a ASCONF-ACK parameter and do * notifications based on the error response */ static void sctp_asconf_process_error(struct sctp_tcb *stcb, struct sctp_asconf_paramhdr *aph) { struct sctp_error_cause *eh; struct sctp_paramhdr *ph; uint16_t param_type; uint16_t error_code; eh = (struct sctp_error_cause *)(aph + 1); ph = (struct sctp_paramhdr *)(eh + 1); /* validate lengths */ if (htons(eh->length) + sizeof(struct sctp_error_cause) > htons(aph->ph.param_length)) { /* invalid error cause length */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("asconf_process_error: cause element too long\n"); } #endif /* SCTP_DEBUG */ return; } if (htons(ph->param_length) + sizeof(struct sctp_paramhdr) > htons(eh->length)) { /* invalid included TLV length */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("asconf_process_error: included TLV too long\n"); } #endif /* SCTP_DEBUG */ return; } /* which error code ? */ error_code = ntohs(eh->code); param_type = ntohs(aph->ph.param_type); /* FIX: this should go back up the REMOTE_ERROR ULP notify */ switch (error_code) { case SCTP_CAUSE_RESOURCE_SHORTAGE: /* we allow ourselves to "try again" for this error */ break; default: /* peer can't handle it... */ switch (param_type) { case SCTP_ADD_IP_ADDRESS: case SCTP_DEL_IP_ADDRESS: stcb->asoc.peer_supports_asconf = 0; break; case SCTP_SET_PRIM_ADDR: stcb->asoc.peer_supports_asconf = 0; break; default: break; } } } /* * process an asconf queue param aparam: parameter to process, will be * removed from the queue flag: 1=success, 0=failure */ static void sctp_asconf_process_param_ack(struct sctp_tcb *stcb, struct sctp_asconf_addr *aparam, uint32_t flag) { uint16_t param_type; /* process this param */ param_type = aparam->ap.aph.ph.param_type; switch (param_type) { case SCTP_ADD_IP_ADDRESS: #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_param_ack: added IP address\n"); } #endif /* SCTP_DEBUG */ sctp_asconf_addr_mgmt_ack(stcb, aparam->ifa, param_type, flag); break; case SCTP_DEL_IP_ADDRESS: #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("process_param_ack: deleted IP address\n"); } #endif /* SCTP_DEBUG */ /* nothing really to do... lists already updated */ break; case SCTP_SET_PRIM_ADDR: /* nothing to do... peer may start using this addr */ if (flag == 0) stcb->asoc.peer_supports_asconf = 0; break; default: /* should NEVER happen */ break; } /* remove the param and free it */ TAILQ_REMOVE(&stcb->asoc.asconf_queue, aparam, next); SCTP_FREE(aparam); } /* * cleanup from a bad asconf ack parameter */ static void sctp_asconf_ack_clear(struct sctp_tcb *stcb) { /* assume peer doesn't really know how to do asconfs */ stcb->asoc.peer_supports_asconf = 0; /* XXX we could free the pending queue here */ } void sctp_handle_asconf_ack(struct mbuf *m, int offset, struct sctp_asconf_ack_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) { struct sctp_association *asoc; uint32_t serial_num; uint16_t ack_length; struct sctp_asconf_paramhdr *aph; struct sctp_asconf_addr *aa, *aa_next; uint32_t last_error_id = 0; /* last error correlation id */ uint32_t id; struct sctp_asconf_addr *ap; /* asconf param buffer */ static uint8_t aparam_buf[DEFAULT_PARAM_BUFFER]; /* verify minimum length */ if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_ack_chunk)) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf_ack: chunk too small = %xh\n", ntohs(cp->ch.chunk_length)); } #endif /* SCTP_DEBUG */ return; } asoc = &stcb->asoc; serial_num = ntohl(cp->serial_number); /* * NOTE: we may want to handle this differently- currently, we will * abort when we get an ack for the expected serial number + 1 (eg. * we didn't send it), process an ack normally if it is the expected * serial number, and re-send the previous ack for *ALL* other * serial numbers */ /* * if the serial number is the next expected, but I didn't send it, * abort the asoc, since someone probably just hijacked us... */ if (serial_num == (asoc->asconf_seq_out + 1)) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf_ack: got unexpected next serial number! Aborting asoc!\n"); } #endif /* SCTP_DEBUG */ sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_ILLEGAL_ASCONF_ACK, NULL); return; } if (serial_num != asoc->asconf_seq_out) { /* got a duplicate/unexpected ASCONF-ACK */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf_ack: got duplicate/unexpected serial number = %xh (expected = %xh)\n", serial_num, asoc->asconf_seq_out); } #endif /* SCTP_DEBUG */ return; } if (stcb->asoc.asconf_sent == 0) { /* got a unexpected ASCONF-ACK for serial not in flight */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("handle_asconf_ack: got serial number = %xh but not in flight\n", serial_num); } #endif /* SCTP_DEBUG */ /* nothing to do... duplicate ACK received */ return; } /* stop our timer */ sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_ASCONF + SCTP_LOC_3); /* process the ASCONF-ACK contents */ ack_length = ntohs(cp->ch.chunk_length) - sizeof(struct sctp_asconf_ack_chunk); offset += sizeof(struct sctp_asconf_ack_chunk); /* process through all parameters */ while (ack_length >= sizeof(struct sctp_asconf_paramhdr)) { unsigned int param_length, param_type; /* get pointer to next asconf parameter */ aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf); if (aph == NULL) { /* can't get an asconf paramhdr */ sctp_asconf_ack_clear(stcb); return; } param_type = ntohs(aph->ph.param_type); param_length = ntohs(aph->ph.param_length); if (param_length > ack_length) { sctp_asconf_ack_clear(stcb); return; } if (param_length < sizeof(struct sctp_paramhdr)) { sctp_asconf_ack_clear(stcb); return; } /* get the complete parameter... */ if (param_length > sizeof(aparam_buf)) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("param length (%u) larger than buffer size!\n", param_length); } #endif /* SCTP_DEBUG */ sctp_asconf_ack_clear(stcb); return; } aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf); if (aph == NULL) { sctp_asconf_ack_clear(stcb); return; } /* correlation_id is transparent to peer, no ntohl needed */ id = aph->correlation_id; switch (param_type) { case SCTP_ERROR_CAUSE_IND: last_error_id = id; /* find the corresponding asconf param in our queue */ ap = sctp_asconf_find_param(stcb, id); if (ap == NULL) { /* hmm... can't find this in our queue! */ break; } /* process the parameter, failed flag */ sctp_asconf_process_param_ack(stcb, ap, 0); /* process the error response */ sctp_asconf_process_error(stcb, aph); break; case SCTP_SUCCESS_REPORT: /* find the corresponding asconf param in our queue */ ap = sctp_asconf_find_param(stcb, id); if (ap == NULL) { /* hmm... can't find this in our queue! */ break; } /* process the parameter, success flag */ sctp_asconf_process_param_ack(stcb, ap, 1); break; default: break; } /* switch */ /* update remaining ASCONF-ACK message length to process */ ack_length -= SCTP_SIZE32(param_length); if (ack_length <= 0) { /* no more data in the mbuf chain */ break; } offset += SCTP_SIZE32(param_length); } /* while */ /* * if there are any "sent" params still on the queue, these are * implicitly "success", or "failed" (if we got an error back) ... * so process these appropriately * * we assume that the correlation_id's are monotonically increasing * beginning from 1 and that we don't have *that* many outstanding * at any given time */ if (last_error_id == 0) last_error_id--;/* set to "max" value */ for (aa = TAILQ_FIRST(&stcb->asoc.asconf_queue); aa != NULL; aa = aa_next) { aa_next = TAILQ_NEXT(aa, next); if (aa->sent == 1) { /* * implicitly successful or failed if correlation_id * < last_error_id, then success else, failure */ if (aa->ap.aph.correlation_id < last_error_id) sctp_asconf_process_param_ack(stcb, aa, SCTP_SUCCESS_REPORT); else sctp_asconf_process_param_ack(stcb, aa, SCTP_ERROR_CAUSE_IND); } else { /* * since we always process in order (FIFO queue) if * we reach one that hasn't been sent, the rest * should not have been sent either. so, we're * done... */ break; } } /* update the next sequence number to use */ asoc->asconf_seq_out++; /* remove the old ASCONF on our outbound queue */ sctp_toss_old_asconf(stcb); /* clear the sent flag to allow new ASCONFs */ asoc->asconf_sent = 0; if (!TAILQ_EMPTY(&stcb->asoc.asconf_queue)) { /* we have more params, so restart our timer */ sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, net); } } /* is this an interface that we care about at all? */ static uint32_t sctp_is_desired_interface_type(struct ifaddr *ifa) { int result; /* check the interface type to see if it's one we care about */ switch (ifa->ifa_ifp->if_type) { case IFT_ETHER: case IFT_ISO88023: case IFT_ISO88025: case IFT_STARLAN: case IFT_P10: case IFT_P80: case IFT_HY: case IFT_FDDI: case IFT_PPP: case IFT_XETHER: case IFT_SLIP: case IFT_GIF: result = 1; break; default: result = 0; } return (result); } static uint32_t sctp_is_scopeid_in_nets(struct sctp_tcb *stcb, struct sockaddr *sa) { struct sockaddr_in6 *sin6, *net6; struct sctp_nets *net; if (sa->sa_family != AF_INET6) { /* wrong family */ return (0); } sin6 = (struct sockaddr_in6 *)sa; if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) == 0) { /* not link local address */ return (0); } /* hunt through our destination nets list for this scope_id */ TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { if (((struct sockaddr *)(&net->ro._l_addr))->sa_family != AF_INET6) continue; net6 = (struct sockaddr_in6 *)&net->ro._l_addr; if (IN6_IS_ADDR_LINKLOCAL(&net6->sin6_addr) == 0) continue; if (sctp_is_same_scope(sin6, net6)) { /* found one */ return (1); } } /* didn't find one */ return (0); } /* * address management functions */ static void sctp_addr_mgmt_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct ifaddr *ifa, uint16_t type) { int status; if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0 && sctp_is_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF)) { /* subset bound, no ASCONF allowed case, so ignore */ return; } /* * note: we know this is not the subset bound, no ASCONF case eg. * this is boundall or subset bound w/ASCONF allowed */ /* first, make sure it's a good address family */ if (ifa->ifa_addr->sa_family != AF_INET6 && ifa->ifa_addr->sa_family != AF_INET) { return; } /* make sure we're "allowed" to add this type of addr */ if (ifa->ifa_addr->sa_family == AF_INET6) { struct in6_ifaddr *ifa6; /* invalid if we're not a v6 endpoint */ if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) return; /* is the v6 addr really valid ? */ ifa6 = (struct in6_ifaddr *)ifa; if (IFA6_IS_DEPRECATED(ifa6) || (ifa6->ia6_flags & (IN6_IFF_DETACHED | IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) { /* can't use an invalid address */ return; } } /* put this address on the "pending/do not use yet" list */ /* * Note: we do this primarily for the subset bind case We don't have * scoping flags at the EP level, so we must add link local/site * local addresses to the EP, then need to "negate" them here. * Recall that this routine is only called for the subset bound * w/ASCONF allowed case. */ /* * do a scope_id check against any link local addresses in the * destination nets list to see if we should put this local address * on the pending list or not eg. don't put on the list if we have a * link local destination with the same scope_id */ if (type == SCTP_ADD_IP_ADDRESS) { if (sctp_is_scopeid_in_nets(stcb, ifa->ifa_addr) == 0) { sctp_add_local_addr_assoc(stcb, ifa); } } /* * check address scope if address is out of scope, don't queue * anything... note: this would leave the address on both inp and * asoc lists */ if (ifa->ifa_addr->sa_family == AF_INET6) { struct sockaddr_in6 *sin6; sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { /* we skip unspecifed addresses */ return; } if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { if (stcb->asoc.local_scope == 0) { return; } /* is it the right link local scope? */ if (sctp_is_scopeid_in_nets(stcb, ifa->ifa_addr) == 0) { return; } } if (stcb->asoc.site_scope == 0 && IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) { return; } } else if (ifa->ifa_addr->sa_family == AF_INET) { struct sockaddr_in *sin; struct in6pcb *inp6; inp6 = (struct in6pcb *)&inp->ip_inp.inp; /* invalid if we are a v6 only endpoint */ if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) && SCTP_IPV6_V6ONLY(inp6)) return; sin = (struct sockaddr_in *)ifa->ifa_addr; if (sin->sin_addr.s_addr == 0) { /* we skip unspecifed addresses */ return; } if (stcb->asoc.ipv4_local_scope == 0 && IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) { return; } } else { /* else, not AF_INET or AF_INET6, so skip */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("addr_mgmt_assoc: not AF_INET or AF_INET6\n"); } #endif /* SCTP_DEBUG */ return; } /* queue an asconf for this address add/delete */ if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF)) { /* does the peer do asconf? */ if (stcb->asoc.peer_supports_asconf) { /* queue an asconf for this addr */ status = sctp_asconf_queue_add(stcb, ifa, type); /* * if queued ok, and in correct state, set the * ASCONF timer if in non-open state, we will set * this timer when the state does go open and do all * the asconf's */ if (status == 0 && SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) { sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, stcb->asoc.primary_destination); } } } else { /* this is the boundall, no ASCONF case */ #if 0 /* Peter: Fixe me? why the if 0? */ /* * assume kernel will delete this very shortly; add done * above */ if (type == SCTP_DEL_IP_ADDRESS) { /* if deleting, add this addr to the do not use list */ sctp_add_local_addr_assoc(stcb, ifa); } #endif } } static void sctp_addr_mgmt_ep(struct sctp_inpcb *inp, struct ifaddr *ifa, uint16_t type) { struct sctp_tcb *stcb; SCTP_INP_WLOCK(inp); /* make sure we're "allowed" to add this type of addr */ if (ifa->ifa_addr->sa_family == AF_INET6) { struct in6_ifaddr *ifa6; /* invalid if we're not a v6 endpoint */ if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) { SCTP_INP_WUNLOCK(inp); return; } /* is the v6 addr really valid ? */ ifa6 = (struct in6_ifaddr *)ifa; if (IFA6_IS_DEPRECATED(ifa6) || (ifa6->ia6_flags & (IN6_IFF_DETACHED | IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) { /* can't use an invalid address */ SCTP_INP_WUNLOCK(inp); return; } } else if (ifa->ifa_addr->sa_family == AF_INET) { /* invalid if we are a v6 only endpoint */ struct in6pcb *inp6; inp6 = (struct in6pcb *)&inp->ip_inp.inp; if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) && SCTP_IPV6_V6ONLY(inp6)) { SCTP_INP_WUNLOCK(inp); return; } } else { /* invalid address family */ SCTP_INP_WUNLOCK(inp); return; } /* is this endpoint subset bound ? */ if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) { /* subset bound endpoint */ if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF)) { /* * subset bound, but ASCONFs not allowed... if * adding, nothing to do, since not allowed if * deleting, remove address from endpoint peer will * have to "timeout" this addr */ if (type == SCTP_DEL_IP_ADDRESS) { sctp_del_local_addr_ep(inp, ifa); } /* no asconfs to queue for this inp... */ SCTP_INP_WUNLOCK(inp); return; } else { /* * subset bound, ASCONFs allowed... if adding, add * address to endpoint list if deleting, remove * address from endpoint */ if (type == SCTP_ADD_IP_ADDRESS) { sctp_add_local_addr_ep(inp, ifa); } else { sctp_del_local_addr_ep(inp, ifa); } /* drop through and notify all asocs */ } } /* process for all associations for this endpoint */ LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { SCTP_TCB_LOCK(stcb); sctp_addr_mgmt_assoc(inp, stcb, ifa, type); SCTP_TCB_UNLOCK(stcb); } SCTP_INP_WUNLOCK(inp); } /* * restrict the use of this address */ static void sctp_addr_mgmt_restrict_ep(struct sctp_inpcb *inp, struct ifaddr *ifa) { struct sctp_tcb *stcb; /* is this endpoint bound to all? */ if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) { /* * Nothing to do for subset bound case. Allow sctp_bindx() * to manage the address lists */ return; } SCTP_INP_RLOCK(inp); /* process for all associations for this endpoint */ LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { /* put this address on the "pending/do not use yet" list */ SCTP_TCB_LOCK(stcb); sctp_add_local_addr_assoc(stcb, ifa); SCTP_TCB_UNLOCK(stcb); } SCTP_INP_RUNLOCK(inp); } /* * this is only called for kernel initiated address changes eg. it will check * the PCB_FLAGS_AUTO_ASCONF flag */ static void sctp_addr_mgmt(struct ifaddr *ifa, uint16_t type) { struct sockaddr *sa; struct sctp_inpcb *inp; /* make sure we care about this interface... */ if (!sctp_is_desired_interface_type(ifa)) { return; } sa = ifa->ifa_addr; if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6) return; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { if (type == SCTP_ADD_IP_ADDRESS) printf("sctp_addr_mgmt: kernel adds "); else printf("sctp_addr_mgmt: kernel deletes "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ /* go through all our PCB's */ LIST_FOREACH(inp, &sctppcbinfo.listhead, sctp_list) { if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTO_ASCONF)) { sctp_addr_mgmt_ep(inp, ifa, type); } else { /* this address is going away anyways... */ if (type == SCTP_DEL_IP_ADDRESS) return; /* (temporarily) restrict this address */ sctp_addr_mgmt_restrict_ep(inp, ifa); } /* else, not allowing automatic asconf's, so ignore */ } } /* * add/delete IP address requests from kernel (via routing change) assumed * that the address is non-broadcast, non-multicast all addresses are passed * from any type of interface-- need to filter duplicate addresses may get * requested */ void sctp_add_ip_address(struct ifaddr *ifa) { sctp_addr_mgmt(ifa, SCTP_ADD_IP_ADDRESS); } void sctp_delete_ip_address(struct ifaddr *ifa) { struct sctp_inpcb *inp; /* process the delete */ sctp_addr_mgmt(ifa, SCTP_DEL_IP_ADDRESS); /* * need to remove this ifaddr from any cached routes and also any * from any assoc "restricted/pending" lists */ /* make sure we care about this interface... */ if (!sctp_is_desired_interface_type(ifa)) { return; } /* go through all our PCB's */ SCTP_INP_INFO_RLOCK(); LIST_FOREACH(inp, &sctppcbinfo.listhead, sctp_list) { struct sctp_tcb *stcb; struct sctp_laddr *laddr, *laddr_next; /* process for all associations for this endpoint */ SCTP_INP_RLOCK(inp); LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { struct sctp_nets *net; /* process through the nets list */ TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { struct rtentry *rt; /* delete this address if cached */ rt = net->ro.ro_rt; if (rt != NULL && rt->rt_ifa == ifa) { /* RTFREE(rt); */ net->ro.ro_rt = NULL; } } /* for each net */ /* process through the asoc "pending" list */ laddr = LIST_FIRST(&stcb->asoc.sctp_local_addr_list); while (laddr != NULL) { laddr_next = LIST_NEXT(laddr, sctp_nxt_addr); /* remove if in use */ if (laddr->ifa == ifa) { sctp_remove_laddr(laddr); } laddr = laddr_next; } /* while */ } /* for each stcb */ /* process through the inp bound addr list */ laddr = LIST_FIRST(&inp->sctp_addr_list); while (laddr != NULL) { laddr_next = LIST_NEXT(laddr, sctp_nxt_addr); /* remove if in use */ if (laddr->ifa == ifa) { sctp_remove_laddr(laddr); } laddr = laddr_next; } SCTP_INP_RUNLOCK(inp); } SCTP_INP_INFO_RUNLOCK(); } /* * sa is the sockaddr to ask the peer to set primary to returns: 0 = * completed, -1 = error */ int32_t sctp_set_primary_ip_address_sa(struct sctp_tcb *stcb, struct sockaddr *sa) { /* NOTE: we currently don't check the validity of the address! */ /* queue an ASCONF:SET_PRIM_ADDR to be sent */ if (!sctp_asconf_queue_add_sa(stcb, sa, SCTP_SET_PRIM_ADDR)) { /* set primary queuing succeeded */ if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) { sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, stcb->asoc.primary_destination); } #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("set_primary_ip_address_sa: queued on tcb=%p, ", stcb); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ } else { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("set_primary_ip_address_sa: failed to add to queue on tcb=%p, ", stcb); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ return (-1); } return (0); } void sctp_set_primary_ip_address(struct ifaddr *ifa) { struct sctp_inpcb *inp; /* make sure we care about this interface... */ if (!sctp_is_desired_interface_type(ifa)) { return; } /* go through all our PCB's */ LIST_FOREACH(inp, &sctppcbinfo.listhead, sctp_list) { struct sctp_tcb *stcb; /* process for all associations for this endpoint */ LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { /* queue an ASCONF:SET_PRIM_ADDR to be sent */ if (!sctp_asconf_queue_add(stcb, ifa, SCTP_SET_PRIM_ADDR)) { /* set primary queuing succeeded */ if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) { sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, stcb->asoc.primary_destination); } #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("set_primary_ip_address: queued on stcb=%p, ", stcb); sctp_print_address(ifa->ifa_addr); } #endif /* SCTP_DEBUG */ } } /* for each stcb */ } /* for each inp */ } static struct sockaddr * sctp_find_valid_localaddr(struct sctp_tcb *stcb) { struct ifnet *ifn; struct ifaddr *ifa; TAILQ_FOREACH(ifn, &ifnet, if_list) { if (stcb->asoc.loopback_scope == 0 && ifn->if_type == IFT_LOOP) { /* Skip if loopback_scope not set */ continue; } TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET && stcb->asoc.ipv4_addr_legal) { struct sockaddr_in *sin; sin = (struct sockaddr_in *)ifa->ifa_addr; if (sin->sin_addr.s_addr == 0) { /* skip unspecifed addresses */ continue; } if (stcb->asoc.ipv4_local_scope == 0 && IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) continue; if (sctp_is_addr_restricted(stcb, ifa->ifa_addr)) continue; /* found a valid local v4 address to use */ return (ifa->ifa_addr); } else if (ifa->ifa_addr->sa_family == AF_INET6 && stcb->asoc.ipv6_addr_legal) { struct sockaddr_in6 *sin6; struct in6_ifaddr *ifa6; ifa6 = (struct in6_ifaddr *)ifa; if (IFA6_IS_DEPRECATED(ifa6) || (ifa6->ia6_flags & (IN6_IFF_DETACHED | IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) continue; sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { /* we skip unspecifed addresses */ continue; } if (stcb->asoc.local_scope == 0 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) continue; if (stcb->asoc.site_scope == 0 && IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) continue; /* found a valid local v6 address to use */ return (ifa->ifa_addr); } } } /* no valid addresses found */ return (NULL); } static struct sockaddr * sctp_find_valid_localaddr_ep(struct sctp_tcb *stcb) { struct sctp_laddr *laddr; LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) { if (laddr->ifa == NULL) { continue; } if (laddr->ifa->ifa_addr == NULL) { continue; } /* is the address restricted ? */ if (sctp_is_addr_restricted(stcb, laddr->ifa->ifa_addr)) continue; /* found a valid local address to use */ return (laddr->ifa->ifa_addr); } /* no valid addresses found */ return (NULL); } /* * builds an ASCONF chunk from queued ASCONF params returns NULL on error (no * mbuf, no ASCONF params queued, etc) */ struct mbuf * sctp_compose_asconf(struct sctp_tcb *stcb, int *retlen) { struct mbuf *m_asconf, *m_asconf_chk; struct sctp_asconf_addr *aa; struct sctp_asconf_chunk *acp; struct sctp_asconf_paramhdr *aph; struct sctp_asconf_addr_param *aap; uint32_t p_length; uint32_t correlation_id = 1; /* 0 is reserved... */ caddr_t ptr, lookup_ptr; uint8_t lookup_used = 0; /* are there any asconf params to send? */ if (TAILQ_EMPTY(&stcb->asoc.asconf_queue)) { return (NULL); } /* * get a chunk header mbuf and a cluster for the asconf params since * it's simpler to fill in the asconf chunk header lookup address on * the fly */ m_asconf_chk = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_chunk), 0, M_DONTWAIT, 1, MT_DATA); if (m_asconf_chk == NULL) { /* no mbuf's */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) printf("compose_asconf: couldn't get chunk mbuf!\n"); #endif /* SCTP_DEBUG */ return (NULL); } m_asconf = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); if (m_asconf == NULL) { /* no mbuf's */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) printf("compose_asconf: couldn't get mbuf!\n"); #endif /* SCTP_DEBUG */ sctp_m_freem(m_asconf_chk); return (NULL); } SCTP_BUF_LEN(m_asconf_chk) = sizeof(struct sctp_asconf_chunk); SCTP_BUF_LEN(m_asconf) = 0; acp = mtod(m_asconf_chk, struct sctp_asconf_chunk *); bzero(acp, sizeof(struct sctp_asconf_chunk)); /* save pointers to lookup address and asconf params */ lookup_ptr = (caddr_t)(acp + 1); /* after the header */ ptr = mtod(m_asconf, caddr_t); /* beginning of cluster */ /* fill in chunk header info */ acp->ch.chunk_type = SCTP_ASCONF; acp->ch.chunk_flags = 0; acp->serial_number = htonl(stcb->asoc.asconf_seq_out); /* add parameters... up to smallest MTU allowed */ TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) { /* get the parameter length */ p_length = SCTP_SIZE32(aa->ap.aph.ph.param_length); /* will it fit in current chunk? */ if (SCTP_BUF_LEN(m_asconf) + p_length > stcb->asoc.smallest_mtu) { /* won't fit, so we're done with this chunk */ break; } /* assign (and store) a correlation id */ aa->ap.aph.correlation_id = correlation_id++; /* * fill in address if we're doing a delete this is a simple * way for us to fill in the correlation address, which * should only be used by the peer if we're deleting our * source address and adding a new address (e.g. renumbering * case) */ if (lookup_used == 0 && aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) { struct sctp_ipv6addr_param *lookup; uint16_t p_size, addr_size; lookup = (struct sctp_ipv6addr_param *)lookup_ptr; lookup->ph.param_type = htons(aa->ap.addrp.ph.param_type); if (aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) { /* copy IPv6 address */ p_size = sizeof(struct sctp_ipv6addr_param); addr_size = sizeof(struct in6_addr); } else { /* copy IPv4 address */ p_size = sizeof(struct sctp_ipv4addr_param); addr_size = sizeof(struct in_addr); } lookup->ph.param_length = htons(SCTP_SIZE32(p_size)); memcpy(lookup->addr, &aa->ap.addrp.addr, addr_size); SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size); lookup_used = 1; } /* copy into current space */ memcpy(ptr, &aa->ap, p_length); /* network elements and update lengths */ aph = (struct sctp_asconf_paramhdr *)ptr; aap = (struct sctp_asconf_addr_param *)ptr; /* correlation_id is transparent to peer, no htonl needed */ aph->ph.param_type = htons(aph->ph.param_type); aph->ph.param_length = htons(aph->ph.param_length); aap->addrp.ph.param_type = htons(aap->addrp.ph.param_type); aap->addrp.ph.param_length = htons(aap->addrp.ph.param_length); SCTP_BUF_LEN(m_asconf) += SCTP_SIZE32(p_length); ptr += SCTP_SIZE32(p_length); /* * these params are removed off the pending list upon * getting an ASCONF-ACK back from the peer, just set flag */ aa->sent = 1; } /* check to see if the lookup addr has been populated yet */ if (lookup_used == 0) { /* NOTE: if the address param is optional, can skip this... */ /* add any valid (existing) address... */ struct sctp_ipv6addr_param *lookup; uint16_t p_size, addr_size; struct sockaddr *found_addr; caddr_t addr_ptr; if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) found_addr = sctp_find_valid_localaddr(stcb); else found_addr = sctp_find_valid_localaddr_ep(stcb); lookup = (struct sctp_ipv6addr_param *)lookup_ptr; if (found_addr != NULL) { if (found_addr->sa_family == AF_INET6) { /* copy IPv6 address */ lookup->ph.param_type = htons(SCTP_IPV6_ADDRESS); p_size = sizeof(struct sctp_ipv6addr_param); addr_size = sizeof(struct in6_addr); addr_ptr = (caddr_t)&((struct sockaddr_in6 *) found_addr)->sin6_addr; } else { /* copy IPv4 address */ lookup->ph.param_type = htons(SCTP_IPV4_ADDRESS); p_size = sizeof(struct sctp_ipv4addr_param); addr_size = sizeof(struct in_addr); addr_ptr = (caddr_t)&((struct sockaddr_in *) found_addr)->sin_addr; } lookup->ph.param_length = htons(SCTP_SIZE32(p_size)); memcpy(lookup->addr, addr_ptr, addr_size); SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size); lookup_used = 1; } else { /* uh oh... don't have any address?? */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) printf("compose_asconf: no lookup addr!\n"); #endif /* SCTP_DEBUG */ /* for now, we send a IPv4 address of 0.0.0.0 */ lookup->ph.param_type = htons(SCTP_IPV4_ADDRESS); lookup->ph.param_length = htons(SCTP_SIZE32(sizeof(struct sctp_ipv4addr_param))); bzero(lookup->addr, sizeof(struct in_addr)); SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(sizeof(struct sctp_ipv4addr_param)); lookup_used = 1; } } /* chain it all together */ SCTP_BUF_NEXT(m_asconf_chk) = m_asconf; *retlen = acp->ch.chunk_length = ntohs(SCTP_BUF_LEN(m_asconf_chk) + SCTP_BUF_LEN(m_asconf)); /* update "sent" flag */ stcb->asoc.asconf_sent++; return (m_asconf_chk); } /* * section to handle address changes before an association is up eg. changes * during INIT/INIT-ACK/COOKIE-ECHO handshake */ /* * processes the (local) addresses in the INIT-ACK chunk */ static void sctp_process_initack_addresses(struct sctp_tcb *stcb, struct mbuf *m, unsigned int offset, unsigned int length) { struct sctp_paramhdr tmp_param, *ph; uint16_t plen, ptype; struct sctp_ipv6addr_param addr_store; struct sockaddr_in6 sin6; struct sockaddr_in sin; struct sockaddr *sa; struct ifaddr *ifa; #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF2) { printf("processing init-ack addresses\n"); } #endif /* SCTP_DEBUG */ /* convert to upper bound */ length += offset; if ((offset + sizeof(struct sctp_paramhdr)) > length) { return; } /* init the addresses */ bzero(&sin6, sizeof(sin6)); sin6.sin6_family = AF_INET6; sin6.sin6_len = sizeof(sin6); sin6.sin6_port = stcb->rport; bzero(&sin, sizeof(sin)); sin.sin_len = sizeof(sin); sin.sin_family = AF_INET; sin.sin_port = stcb->rport; /* go through the addresses in the init-ack */ ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param); while (ph != NULL) { ptype = ntohs(ph->param_type); plen = ntohs(ph->param_length); if (ptype == SCTP_IPV6_ADDRESS) { struct sctp_ipv6addr_param *a6p; /* get the entire IPv6 address param */ a6p = (struct sctp_ipv6addr_param *) sctp_m_getptr(m, offset, sizeof(struct sctp_ipv6addr_param), (uint8_t *) & addr_store); if (plen != sizeof(struct sctp_ipv6addr_param) || a6p == NULL) { return; } memcpy(&sin6.sin6_addr, a6p->addr, sizeof(struct in6_addr)); sa = (struct sockaddr *)&sin6; } else if (ptype == SCTP_IPV4_ADDRESS) { struct sctp_ipv4addr_param *a4p; /* get the entire IPv4 address param */ a4p = (struct sctp_ipv4addr_param *)sctp_m_getptr(m, offset, sizeof(struct sctp_ipv4addr_param), (uint8_t *) & addr_store); if (plen != sizeof(struct sctp_ipv4addr_param) || a4p == NULL) { return; } sin.sin_addr.s_addr = a4p->addr; sa = (struct sockaddr *)&sin; } else { goto next_addr; } /* see if this address really (still) exists */ ifa = sctp_find_ifa_by_addr(sa); if (ifa == NULL) { /* address doesn't exist anymore */ int status; /* are ASCONFs allowed ? */ if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && stcb->asoc.peer_supports_asconf) { /* queue an ASCONF DEL_IP_ADDRESS */ status = sctp_asconf_queue_add_sa(stcb, sa, SCTP_DEL_IP_ADDRESS); /* * if queued ok, and in correct state, set * the ASCONF timer */ if (status == 0 && SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) { sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, stcb->asoc.primary_destination); } } } else { /* address still exists */ /* * if subset bound, ep addr's managed by default if * not doing ASCONF, add the address to the assoc */ if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0 && (sctp_is_feature_off(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF))) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF2) { printf("process_initack_addrs: adding local addr to asoc\n"); } #endif /* SCTP_DEBUG */ sctp_add_local_addr_assoc(stcb, ifa); } } next_addr: /* * Sanity check: Make sure the length isn't 0, otherwise * we'll be stuck in this loop for a long time... */ if (SCTP_SIZE32(plen) == 0) { #ifdef SCTP_DEBUG printf("process_initack_addrs: bad len (%d) type=%xh\n", plen, ptype); #endif return; } /* get next parameter */ offset += SCTP_SIZE32(plen); if ((offset + sizeof(struct sctp_paramhdr)) > length) return; ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param); } /* while */ } /* FIX ME: need to verify return result for v6 address type if v6 disabled */ /* * checks to see if a specific address is in the initack address list returns * 1 if found, 0 if not */ static uint32_t sctp_addr_in_initack(struct sctp_tcb *stcb, struct mbuf *m, uint32_t offset, uint32_t length, struct sockaddr *sa) { struct sctp_paramhdr tmp_param, *ph; uint16_t plen, ptype; struct sctp_ipv6addr_param addr_store; struct sockaddr_in *sin; struct sctp_ipv4addr_param *a4p; #ifdef INET6 struct sockaddr_in6 *sin6, sin6_tmp; struct sctp_ipv6addr_param *a6p; #endif /* INET6 */ if ( #ifdef INET6 (sa->sa_family != AF_INET6) && #endif /* INET6 */ (sa->sa_family != AF_INET)) return (0); #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF2) { printf("find_initack_addr: starting search for "); sctp_print_address(sa); } #endif /* SCTP_DEBUG */ /* convert to upper bound */ length += offset; if ((offset + sizeof(struct sctp_paramhdr)) > length) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("find_initack_addr: invalid offset?\n"); } #endif /* SCTP_DEBUG */ return (0); } /* go through the addresses in the init-ack */ ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param); while (ph != NULL) { ptype = ntohs(ph->param_type); plen = ntohs(ph->param_length); #ifdef INET6 if (ptype == SCTP_IPV6_ADDRESS && sa->sa_family == AF_INET6) { /* get the entire IPv6 address param */ a6p = (struct sctp_ipv6addr_param *) sctp_m_getptr(m, offset, sizeof(struct sctp_ipv6addr_param), (uint8_t *) & addr_store); if (plen != sizeof(struct sctp_ipv6addr_param) || ph == NULL) { return (0); } sin6 = (struct sockaddr_in6 *)sa; if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) { /* create a copy and clear scope */ memcpy(&sin6_tmp, sin6, sizeof(struct sockaddr_in6)); sin6 = &sin6_tmp; in6_clearscope(&sin6->sin6_addr); } if (memcmp(&sin6->sin6_addr, a6p->addr, sizeof(struct in6_addr)) == 0) { /* found it */ return (1); } } else #endif /* INET6 */ if (ptype == SCTP_IPV4_ADDRESS && sa->sa_family == AF_INET) { /* get the entire IPv4 address param */ a4p = (struct sctp_ipv4addr_param *)sctp_m_getptr(m, offset, sizeof(struct sctp_ipv4addr_param), (uint8_t *) & addr_store); if (plen != sizeof(struct sctp_ipv4addr_param) || ph == NULL) { return (0); } sin = (struct sockaddr_in *)sa; if (sin->sin_addr.s_addr == a4p->addr) { /* found it */ return (1); } } /* get next parameter */ offset += SCTP_SIZE32(plen); if (offset + sizeof(struct sctp_paramhdr) > length) return (0); ph = (struct sctp_paramhdr *) sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param); } /* while */ /* not found! */ return (0); } /* * makes sure that the current endpoint local addr list is consistent with * the new association (eg. subset bound, asconf allowed) adds addresses as * necessary */ static void sctp_check_address_list_ep(struct sctp_tcb *stcb, struct mbuf *m, int offset, int length, struct sockaddr *init_addr) { struct sctp_laddr *laddr; /* go through the endpoint list */ LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) { /* be paranoid and validate the laddr */ if (laddr->ifa == NULL) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("check_addr_list_ep: laddr->ifa is NULL"); } #endif /* SCTP_DEBUG */ continue; } if (laddr->ifa->ifa_addr == NULL) { #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_ASCONF1) { printf("check_addr_list_ep: laddr->ifa->ifa_addr is NULL"); } #endif /* SCTP_DEBUG */ continue; } /* do i have it implicitly? */ if (sctp_cmpaddr(laddr->ifa->ifa_addr, init_addr)) { continue; } /* check to see if in the init-ack */ if (!sctp_addr_in_initack(stcb, m, offset, length, laddr->ifa->ifa_addr)) { /* try to add it */ sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb, laddr->ifa, SCTP_ADD_IP_ADDRESS); } } } /* * makes sure that the current kernel address list is consistent with the new * association (with all addrs bound) adds addresses as necessary */ static void sctp_check_address_list_all(struct sctp_tcb *stcb, struct mbuf *m, int offset, int length, struct sockaddr *init_addr, uint16_t local_scope, uint16_t site_scope, uint16_t ipv4_scope, uint16_t loopback_scope) { struct ifnet *ifn; struct ifaddr *ifa; /* go through all our known interfaces */ TAILQ_FOREACH(ifn, &ifnet, if_list) { if (loopback_scope == 0 && ifn->if_type == IFT_LOOP) { /* skip loopback interface */ continue; } /* go through each interface address */ TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) { /* do i have it implicitly? */ if (sctp_cmpaddr(ifa->ifa_addr, init_addr)) { continue; } /* check to see if in the init-ack */ if (!sctp_addr_in_initack(stcb, m, offset, length, ifa->ifa_addr)) { /* try to add it */ sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb, ifa, SCTP_ADD_IP_ADDRESS); } } /* end foreach ifa */ } /* end foreach ifn */ } /* * validates an init-ack chunk (from a cookie-echo) with current addresses * adds addresses from the init-ack into our local address list, if needed * queues asconf adds/deletes addresses as needed and makes appropriate list * changes for source address selection m, offset: points to the start of the * address list in an init-ack chunk length: total length of the address * params only init_addr: address where my INIT-ACK was sent from */ void sctp_check_address_list(struct sctp_tcb *stcb, struct mbuf *m, int offset, int length, struct sockaddr *init_addr, uint16_t local_scope, uint16_t site_scope, uint16_t ipv4_scope, uint16_t loopback_scope) { /* process the local addresses in the initack */ sctp_process_initack_addresses(stcb, m, offset, length); if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) { /* bound all case */ sctp_check_address_list_all(stcb, m, offset, length, init_addr, local_scope, site_scope, ipv4_scope, loopback_scope); } else { /* subset bound case */ if (sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) { /* asconf's allowed */ sctp_check_address_list_ep(stcb, m, offset, length, init_addr); } /* else, no asconfs allowed, so what we sent is what we get */ } } /* * sctp_bindx() support */ uint32_t sctp_addr_mgmt_ep_sa(struct sctp_inpcb *inp, struct sockaddr *sa, uint16_t type) { struct ifaddr *ifa; if (sa->sa_len == 0) return (EINVAL); ifa = sctp_find_ifa_by_addr(sa); if (ifa != NULL) { #ifdef INET6 if (ifa->ifa_addr->sa_family == AF_INET6) { struct in6_ifaddr *ifa6; ifa6 = (struct in6_ifaddr *)ifa; if (IFA6_IS_DEPRECATED(ifa6) || (ifa6->ia6_flags & (IN6_IFF_DETACHED | IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) { /* Can't bind a non-existent addr. */ return (EINVAL); } } #endif /* INET6 */ /* add this address */ sctp_addr_mgmt_ep(inp, ifa, type); } else { /* invalid address! */ return (EADDRNOTAVAIL); } return (0); } void sctp_addr_change(struct ifaddr *ifa, int cmd) { struct sctp_laddr *wi; wi = (struct sctp_laddr *)SCTP_ZONE_GET(sctppcbinfo.ipi_zone_laddr); if (wi == NULL) { /* * Gak, what can we do? We have lost an address change can * you say HOSED? */ #ifdef SCTP_DEBUG if (sctp_debug_on & SCTP_DEBUG_PCB1) { printf("Lost and address change ???\n"); } #endif /* SCTP_DEBUG */ return; } SCTP_INCR_LADDR_COUNT(); bzero(wi, sizeof(*wi)); wi->ifa = ifa; IFAREF(ifa); wi->action = cmd; SCTP_IPI_ADDR_LOCK(); /* * Should this really be a tailq? As it is we will process the * newest first :-0 */ LIST_INSERT_HEAD(&sctppcbinfo.addr_wq, wi, sctp_nxt_addr); sctp_timer_start(SCTP_TIMER_TYPE_ADDR_WQ, (struct sctp_inpcb *)NULL, (struct sctp_tcb *)NULL, (struct sctp_nets *)NULL); SCTP_IPI_ADDR_UNLOCK(); }