diff options
Diffstat (limited to 'src/vnet/bfd/bfd_udp.c')
| -rw-r--r-- | src/vnet/bfd/bfd_udp.c | 40 |
1 files changed, 36 insertions, 4 deletions
diff --git a/src/vnet/bfd/bfd_udp.c b/src/vnet/bfd/bfd_udp.c index e1ff8a9d887..75b35974329 100644 --- a/src/vnet/bfd/bfd_udp.c +++ b/src/vnet/bfd/bfd_udp.c @@ -1,3 +1,17 @@ +/* + * Copyright (c) 2011-2016 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ #include <vppinfra/types.h> #include <vlibmemory/api.h> #include <vlib/vlib.h> @@ -31,10 +45,25 @@ static vlib_node_registration_t bfd_udp6_input_node; bfd_udp_main_t bfd_udp_main; +static u16 +bfd_udp_bs_idx_to_sport (u32 bs_idx) +{ + /* The source port MUST be in the range 49152 through 65535. The same UDP + * source port number MUST be used for all BFD Control packets associated + * with a particular session. The source port number SHOULD be unique among + * all BFD sessions on the system. If more than 16384 BFD sessions are + * simultaneously active, UDP source port numbers MAY be reused on + * multiple sessions, but the number of distinct uses of the same UDP + * source port number SHOULD be minimized. + */ + return 49152 + bs_idx % (65535 - 49152 + 1); +} + void bfd_add_udp4_transport (vlib_main_t * vm, vlib_buffer_t * b, - bfd_udp_session_t * bus) + const bfd_session_t * bs) { + const bfd_udp_session_t *bus = &bs->udp; const bfd_udp_key_t *key = &bus->key; b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED; @@ -55,7 +84,8 @@ bfd_add_udp4_transport (vlib_main_t * vm, vlib_buffer_t * b, headers->ip4.src_address.as_u32 = key->local_addr.ip4.as_u32; headers->ip4.dst_address.as_u32 = key->peer_addr.ip4.as_u32; - headers->udp.src_port = clib_host_to_net_u16 (50000); /* FIXME */ + headers->udp.src_port = + clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx)); headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4); /* fix ip length, checksum and udp length */ @@ -70,8 +100,9 @@ bfd_add_udp4_transport (vlib_main_t * vm, vlib_buffer_t * b, void bfd_add_udp6_transport (vlib_main_t * vm, vlib_buffer_t * b, - bfd_udp_session_t * bus) + const bfd_session_t * bs) { + const bfd_udp_session_t *bus = &bs->udp; const bfd_udp_key_t *key = &bus->key; b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED; @@ -95,7 +126,8 @@ bfd_add_udp6_transport (vlib_main_t * vm, vlib_buffer_t * b, clib_memcpy (&headers->ip6.dst_address, &key->peer_addr.ip6, sizeof (headers->ip6.dst_address)); - headers->udp.src_port = clib_host_to_net_u16 (50000); /* FIXME */ + headers->udp.src_port = + clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx)); headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd6); /* fix ip payload length and udp length */ |