From dc022a9874d026c7d1635ae66d1afafc5f053731 Mon Sep 17 00:00:00 2001 From: Sridhar Samudrala Date: Fri, 21 Jul 2006 14:49:25 -0700 Subject: [SCTP]: ADDIP: Don't use an address as source until it is ASCONF-ACKed This implements Rules D1 and D4 of Sec 4.3 in the ADDIP draft. Signed-off-by: Sridhar Samudrala Signed-off-by: David S. Miller --- include/net/sctp/structs.h | 7 ++--- net/sctp/bind_addr.c | 8 ++++-- net/sctp/ipv6.c | 3 +- net/sctp/protocol.c | 7 +++-- net/sctp/sm_make_chunk.c | 10 +++++-- net/sctp/socket.c | 72 +++++++++++++++++++++++++++++++++++++--------- 6 files changed, 80 insertions(+), 27 deletions(-) diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index 268f2e1..e5aa7ff 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -731,13 +731,10 @@ void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); /* This is a structure for holding either an IPv6 or an IPv4 address. */ -/* sin_family -- AF_INET or AF_INET6 - * sin_port -- ordinary port number - * sin_addr -- cast to either (struct in_addr) or (struct in6_addr) - */ struct sctp_sockaddr_entry { struct list_head list; union sctp_addr a; + __u8 use_as_src; }; typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); @@ -1142,7 +1139,7 @@ int sctp_bind_addr_copy(struct sctp_bind_addr *dest, sctp_scope_t scope, gfp_t gfp, int flags); int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, - gfp_t gfp); + __u8 use_as_src, gfp_t gfp); int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, struct sctp_sock *); diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c index 2b96262..2b9c12a 100644 --- a/net/sctp/bind_addr.c +++ b/net/sctp/bind_addr.c @@ -146,7 +146,7 @@ void sctp_bind_addr_free(struct sctp_bind_addr *bp) /* Add an address to the bind address list in the SCTP_bind_addr structure. */ int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, - gfp_t gfp) + __u8 use_as_src, gfp_t gfp) { struct sctp_sockaddr_entry *addr; @@ -163,6 +163,8 @@ int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, if (!addr->a.v4.sin_port) addr->a.v4.sin_port = bp->port; + addr->use_as_src = use_as_src; + INIT_LIST_HEAD(&addr->list); list_add_tail(&addr->list, &bp->address_list); SCTP_DBG_OBJCNT_INC(addr); @@ -274,7 +276,7 @@ int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, } af->from_addr_param(&addr, rawaddr, port, 0); - retval = sctp_add_bind_addr(bp, &addr, gfp); + retval = sctp_add_bind_addr(bp, &addr, 1, gfp); if (retval) { /* Can't finish building the list, clean up. */ sctp_bind_addr_clean(bp); @@ -367,7 +369,7 @@ static int sctp_copy_one_addr(struct sctp_bind_addr *dest, (((AF_INET6 == addr->sa.sa_family) && (flags & SCTP_ADDR6_ALLOWED) && (flags & SCTP_ADDR6_PEERSUPP)))) - error = sctp_add_bind_addr(dest, addr, gfp); + error = sctp_add_bind_addr(dest, addr, 1, gfp); } return error; diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index 8ef0807..99c0cef 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -290,7 +290,8 @@ static void sctp_v6_get_saddr(struct sctp_association *asoc, sctp_read_lock(addr_lock); list_for_each(pos, &bp->address_list) { laddr = list_entry(pos, struct sctp_sockaddr_entry, list); - if ((laddr->a.sa.sa_family == AF_INET6) && + if ((laddr->use_as_src) && + (laddr->a.sa.sa_family == AF_INET6) && (scope <= sctp_scope(&laddr->a))) { bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); if (!baddr || (matchlen < bmatchlen)) { diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index 816c033..1ab03a2 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -240,7 +240,7 @@ int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, (((AF_INET6 == addr->a.sa.sa_family) && (copy_flags & SCTP_ADDR6_ALLOWED) && (copy_flags & SCTP_ADDR6_PEERSUPP)))) { - error = sctp_add_bind_addr(bp, &addr->a, + error = sctp_add_bind_addr(bp, &addr->a, 1, GFP_ATOMIC); if (error) goto end_copy; @@ -486,6 +486,8 @@ static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, list_for_each(pos, &bp->address_list) { laddr = list_entry(pos, struct sctp_sockaddr_entry, list); + if (!laddr->use_as_src) + continue; sctp_v4_dst_saddr(&dst_saddr, dst, bp->port); if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) goto out_unlock; @@ -506,7 +508,8 @@ static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, list_for_each(pos, &bp->address_list) { laddr = list_entry(pos, struct sctp_sockaddr_entry, list); - if (AF_INET == laddr->a.sa.sa_family) { + if ((laddr->use_as_src) && + (AF_INET == laddr->a.sa.sa_family)) { fl.fl4_src = laddr->a.v4.sin_addr.s_addr; if (!ip_route_output_key(&rt, &fl)) { dst = &rt->u.dst; diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 8134e8b..4f11f58 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -1493,7 +1493,7 @@ no_hmac: /* Also, add the destination address. */ if (list_empty(&retval->base.bind_addr.address_list)) { - sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, + sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1, GFP_ATOMIC); } @@ -2565,6 +2565,7 @@ static int sctp_asconf_param_success(struct sctp_association *asoc, union sctp_addr_param *addr_param; struct list_head *pos; struct sctp_transport *transport; + struct sctp_sockaddr_entry *saddr; int retval = 0; addr_param = (union sctp_addr_param *) @@ -2578,7 +2579,11 @@ static int sctp_asconf_param_success(struct sctp_association *asoc, case SCTP_PARAM_ADD_IP: sctp_local_bh_disable(); sctp_write_lock(&asoc->base.addr_lock); - retval = sctp_add_bind_addr(bp, &addr, GFP_ATOMIC); + list_for_each(pos, &bp->address_list) { + saddr = list_entry(pos, struct sctp_sockaddr_entry, list); + if (sctp_cmp_addr_exact(&saddr->a, &addr)) + saddr->use_as_src = 1; + } sctp_write_unlock(&asoc->base.addr_lock); sctp_local_bh_enable(); break; @@ -2591,6 +2596,7 @@ static int sctp_asconf_param_success(struct sctp_association *asoc, list_for_each(pos, &asoc->peer.transport_addr_list) { transport = list_entry(pos, struct sctp_transport, transports); + dst_release(transport->dst); sctp_transport_route(transport, NULL, sctp_sk(asoc->base.sk)); } diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 518c55a..54722e6 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -369,7 +369,7 @@ SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len) /* Use GFP_ATOMIC since BHs are disabled. */ addr->v4.sin_port = ntohs(addr->v4.sin_port); - ret = sctp_add_bind_addr(bp, addr, GFP_ATOMIC); + ret = sctp_add_bind_addr(bp, addr, 1, GFP_ATOMIC); addr->v4.sin_port = htons(addr->v4.sin_port); sctp_write_unlock(&ep->base.addr_lock); sctp_local_bh_enable(); @@ -491,6 +491,7 @@ static int sctp_send_asconf_add_ip(struct sock *sk, struct sctp_chunk *chunk; struct sctp_sockaddr_entry *laddr; union sctp_addr *addr; + union sctp_addr saveaddr; void *addr_buf; struct sctp_af *af; struct list_head *pos; @@ -558,14 +559,26 @@ static int sctp_send_asconf_add_ip(struct sock *sk, } retval = sctp_send_asconf(asoc, chunk); + if (retval) + goto out; - /* FIXME: After sending the add address ASCONF chunk, we - * cannot append the address to the association's binding - * address list, because the new address may be used as the - * source of a message sent to the peer before the ASCONF - * chunk is received by the peer. So we should wait until - * ASCONF_ACK is received. + /* Add the new addresses to the bind address list with + * use_as_src set to 0. */ + sctp_local_bh_disable(); + sctp_write_lock(&asoc->base.addr_lock); + addr_buf = addrs; + for (i = 0; i < addrcnt; i++) { + addr = (union sctp_addr *)addr_buf; + af = sctp_get_af_specific(addr->v4.sin_family); + memcpy(&saveaddr, addr, af->sockaddr_len); + saveaddr.v4.sin_port = ntohs(saveaddr.v4.sin_port); + retval = sctp_add_bind_addr(bp, &saveaddr, 0, + GFP_ATOMIC); + addr_buf += af->sockaddr_len; + } + sctp_write_unlock(&asoc->base.addr_lock); + sctp_local_bh_enable(); } out: @@ -676,12 +689,15 @@ static int sctp_send_asconf_del_ip(struct sock *sk, struct sctp_sock *sp; struct sctp_endpoint *ep; struct sctp_association *asoc; + struct sctp_transport *transport; struct sctp_bind_addr *bp; struct sctp_chunk *chunk; union sctp_addr *laddr; + union sctp_addr saveaddr; void *addr_buf; struct sctp_af *af; - struct list_head *pos; + struct list_head *pos, *pos1; + struct sctp_sockaddr_entry *saddr; int i; int retval = 0; @@ -748,14 +764,42 @@ static int sctp_send_asconf_del_ip(struct sock *sk, goto out; } - retval = sctp_send_asconf(asoc, chunk); + /* Reset use_as_src flag for the addresses in the bind address + * list that are to be deleted. + */ + sctp_local_bh_disable(); + sctp_write_lock(&asoc->base.addr_lock); + addr_buf = addrs; + for (i = 0; i < addrcnt; i++) { + laddr = (union sctp_addr *)addr_buf; + af = sctp_get_af_specific(laddr->v4.sin_family); + memcpy(&saveaddr, laddr, af->sockaddr_len); + saveaddr.v4.sin_port = ntohs(saveaddr.v4.sin_port); + list_for_each(pos1, &bp->address_list) { + saddr = list_entry(pos1, + struct sctp_sockaddr_entry, + list); + if (sctp_cmp_addr_exact(&saddr->a, &saveaddr)) + saddr->use_as_src = 0; + } + addr_buf += af->sockaddr_len; + } + sctp_write_unlock(&asoc->base.addr_lock); + sctp_local_bh_enable(); - /* FIXME: After sending the delete address ASCONF chunk, we - * cannot remove the addresses from the association's bind - * address list, because there maybe some packet send to - * the delete addresses, so we should wait until ASCONF_ACK - * packet is received. + /* Update the route and saddr entries for all the transports + * as some of the addresses in the bind address list are + * about to be deleted and cannot be used as source addresses. */ + list_for_each(pos1, &asoc->peer.transport_addr_list) { + transport = list_entry(pos1, struct sctp_transport, + transports); + dst_release(transport->dst); + sctp_transport_route(transport, NULL, + sctp_sk(asoc->base.sk)); + } + + retval = sctp_send_asconf(asoc, chunk); } out: return retval; -- cgit v1.1