Gitiles
Code Review Sign In
gerrit.nordix.org / fdio / vpp / 0f8b91f5d8e4bc2f9a0166440abaf00b2bda29bb / . / src / vnet / bfd / bfd_udp.c
blob: 333b321f3c1b92e2aaf503a0908bf7f081801d32 [file] [log] [blame]
/*
* 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.
*/
/**
* @file
* @brief BFD UDP transport layer implementation
*/
#include <vppinfra/types.h>
#include <vlibmemory/api.h>
#include <vlib/vlib.h>
#include <vlib/buffer.h>
#include <vnet/ip/format.h>
#include <vnet/ethernet/packet.h>
#include <vnet/udp/udp_local.h>
#include <vnet/udp/udp_packet.h>
#include <vnet/ip/lookup.h>
#include <vnet/ip/icmp46_packet.h>
#include <vnet/ip/ip4.h>
#include <vnet/ip/ip6.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/ip/ip6_link.h>
#include <vnet/adj/adj.h>
#include <vnet/adj/adj_nbr.h>
#include <vnet/dpo/receive_dpo.h>
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/fib_table.h>
#include <vnet/bfd/bfd_debug.h>
#include <vnet/bfd/bfd_udp.h>
#include <vnet/bfd/bfd_main.h>
#include <vnet/bfd/bfd_api.h>
typedef struct
{
bfd_main_t *bfd_main;
/* hashmap - bfd session index by bfd key - used for CLI/API lookup, where
* discriminator is unknown */
mhash_t bfd_session_idx_by_bfd_key;
/* convenience variable */
vnet_main_t *vnet_main;
/* flag indicating whether echo_source_sw_if_index holds a valid value */
int echo_source_is_set;
/* loopback interface used to get echo source ip */
u32 echo_source_sw_if_index;
/* node index of "ip4-arp" node */
u32 ip4_arp_idx;
/* node index of "ip6-discover-neighbor" node */
u32 ip6_ndp_idx;
/* node index of "ip4-rewrite" node */
u32 ip4_rewrite_idx;
/* node index of "ip6-rewrite" node */
u32 ip6_rewrite_idx;
/* node index of "ip4-midchain" node */
u32 ip4_midchain_idx;
/* node index of "ip6-midchain" node */
u32 ip6_midchain_idx;
/* log class */
vlib_log_class_t log_class;
/* number of active udp4 sessions */
u32 udp4_sessions_count;
/* number of active udp6 sessions */
u32 udp6_sessions_count;
} bfd_udp_main_t;
static vlib_node_registration_t bfd_udp4_input_node;
static vlib_node_registration_t bfd_udp6_input_node;
static vlib_node_registration_t bfd_udp_echo4_input_node;
static vlib_node_registration_t bfd_udp_echo6_input_node;
bfd_udp_main_t bfd_udp_main;
vnet_api_error_t
bfd_udp_set_echo_source (u32 sw_if_index)
{
vnet_sw_interface_t *sw_if =
vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main, sw_if_index);
if (sw_if)
{
bfd_udp_main.echo_source_sw_if_index = sw_if_index;
bfd_udp_main.echo_source_is_set = 1;
return 0;
}
return VNET_API_ERROR_BFD_ENOENT;
}
vnet_api_error_t
bfd_udp_del_echo_source (u32 sw_if_index)
{
bfd_udp_main.echo_source_sw_if_index = ~0;
bfd_udp_main.echo_source_is_set = 0;
return 0;
}
int
bfd_udp_is_echo_available (bfd_transport_e transport)
{
if (!bfd_udp_main.echo_source_is_set)
{
BFD_DBG ("UDP echo source not set - echo not available");
return 0;
}
/*
* for the echo to work, we need a loopback interface with at least one
* address with netmask length at most 31 (ip4) or 127 (ip6) so that we can
* pick an unused address from that subnet
*/
vnet_sw_interface_t *sw_if =
vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main,
bfd_udp_main.echo_source_sw_if_index);
if (sw_if && sw_if->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
{
if (BFD_TRANSPORT_UDP4 == transport)
{
ip4_main_t *im = &ip4_main;
ip_interface_address_t *ia = NULL;
/* *INDENT-OFF* */
foreach_ip_interface_address (&im->lookup_main, ia,
bfd_udp_main.echo_source_sw_if_index,
0 /* honor unnumbered */, ({
if (ia->address_length <= 31)
{
return 1;
}
}));
/* *INDENT-ON* */
}
else if (BFD_TRANSPORT_UDP6 == transport)
{
ip6_main_t *im = &ip6_main;
ip_interface_address_t *ia = NULL;
/* *INDENT-OFF* */
foreach_ip_interface_address (&im->lookup_main, ia,
bfd_udp_main.echo_source_sw_if_index,
0 /* honor unnumbered */, ({
if (ia->address_length <= 127)
{
return 1;
}
}));
/* *INDENT-ON* */
}
}
BFD_DBG ("No usable IP address for UDP echo - echo not available");
return 0;
}
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);
}
int
bfd_udp_get_echo_src_ip4 (ip4_address_t * addr)
{
if (!bfd_udp_main.echo_source_is_set)
{
BFD_ERR ("cannot find ip4 address, echo source not set");
return 0;
}
ip_interface_address_t *ia = NULL;
ip4_main_t *im = &ip4_main;
/* *INDENT-OFF* */
foreach_ip_interface_address (
&im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index,
0 /* honor unnumbered */, ({
ip4_address_t *x =
ip_interface_address_get_address (&im->lookup_main, ia);
if (ia->address_length <= 31)
{
addr->as_u32 = clib_host_to_net_u32 (x->as_u32);
/*
* flip the last bit to get a different address, might be network,
* we don't care ...
*/
addr->as_u32 ^= 1;
addr->as_u32 = clib_net_to_host_u32 (addr->as_u32);
return 1;
}
}));
/* *INDENT-ON* */
BFD_ERR ("cannot find ip4 address, no usable address found");
return 0;
}
int
bfd_udp_get_echo_src_ip6 (ip6_address_t * addr)
{
if (!bfd_udp_main.echo_source_is_set)
{
BFD_ERR ("cannot find ip6 address, echo source not set");
return 0;
}
ip_interface_address_t *ia = NULL;
ip6_main_t *im = &ip6_main;
/* *INDENT-OFF* */
foreach_ip_interface_address (
&im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index,
0 /* honor unnumbered */, ({
ip6_address_t *x =
ip_interface_address_get_address (&im->lookup_main, ia);
if (ia->address_length <= 127)
{
*addr = *x;
addr->as_u8[15] ^= 1; /* flip the last bit of the address */
return 1;
}
}));
/* *INDENT-ON* */
BFD_ERR ("cannot find ip6 address, no usable address found");
return 0;
}
void
bfd_udp_get_echo_source (int *is_set, u32 * sw_if_index,
int *have_usable_ip4, ip4_address_t * ip4,
int *have_usable_ip6, ip6_address_t * ip6)
{
if (bfd_udp_main.echo_source_is_set)
{
*is_set = 1;
*sw_if_index = bfd_udp_main.echo_source_sw_if_index;
*have_usable_ip4 = bfd_udp_get_echo_src_ip4 (ip4);
*have_usable_ip6 = bfd_udp_get_echo_src_ip6 (ip6);
}
else
{
*is_set = 0;
}
}
int
bfd_add_udp4_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs,
int is_echo)
{
const bfd_udp_session_t *bus = &bs->udp;
const bfd_udp_key_t *key = &bus->key;
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
typedef struct
{
ip4_header_t ip4;
udp_header_t udp;
} ip4_udp_headers;
ip4_udp_headers *headers = NULL;
vlib_buffer_advance (b, -sizeof (*headers));
headers = vlib_buffer_get_current (b);
clib_memset (headers, 0, sizeof (*headers));
headers->ip4.ip_version_and_header_length = 0x45;
headers->ip4.ttl = 255;
headers->ip4.protocol = IP_PROTOCOL_UDP;
headers->udp.src_port =
clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx));
if (is_echo)
{
int rv;
if (!(rv = bfd_udp_get_echo_src_ip4 (&headers->ip4.src_address)))
{
return rv;
}
headers->ip4.dst_address.as_u32 = key->local_addr.ip4.as_u32;
headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo4);
}
else
{
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.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4);
}
/* fix ip length, checksum and udp length */
const u16 ip_length = vlib_buffer_length_in_chain (vm, b);
headers->ip4.length = clib_host_to_net_u16 (ip_length);
headers->ip4.checksum = ip4_header_checksum (&headers->ip4);
const u16 udp_length = ip_length - (sizeof (headers->ip4));
headers->udp.length = clib_host_to_net_u16 (udp_length);
return 1;
}
int
bfd_add_udp6_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs,
int is_echo)
{
const bfd_udp_session_t *bus = &bs->udp;
const bfd_udp_key_t *key = &bus->key;
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
typedef struct
{
ip6_header_t ip6;
udp_header_t udp;
} ip6_udp_headers;
ip6_udp_headers *headers = NULL;
vlib_buffer_advance (b, -sizeof (*headers));
headers = vlib_buffer_get_current (b);
clib_memset (headers, 0, sizeof (*headers));
headers->ip6.ip_version_traffic_class_and_flow_label =
clib_host_to_net_u32 (0x6 << 28);
headers->ip6.hop_limit = 255;
headers->ip6.protocol = IP_PROTOCOL_UDP;
headers->udp.src_port =
clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx));
if (is_echo)
{
int rv;
if (!(rv = bfd_udp_get_echo_src_ip6 (&headers->ip6.src_address)))
{
return rv;
}
clib_memcpy_fast (&headers->ip6.dst_address, &key->local_addr.ip6,
sizeof (headers->ip6.dst_address));
headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo6);
}
else
{
clib_memcpy_fast (&headers->ip6.src_address, &key->local_addr.ip6,
sizeof (headers->ip6.src_address));
clib_memcpy_fast (&headers->ip6.dst_address, &key->peer_addr.ip6,
sizeof (headers->ip6.dst_address));
headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd6);
}
/* fix ip payload length and udp length */
const u16 udp_length =
vlib_buffer_length_in_chain (vm, b) - (sizeof (headers->ip6));
headers->udp.length = clib_host_to_net_u16 (udp_length);
headers->ip6.payload_length = headers->udp.length;
/* IPv6 UDP checksum is mandatory */
int bogus = 0;
headers->udp.checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b, &headers->ip6, &bogus);
ASSERT (bogus == 0);
if (headers->udp.checksum == 0)
{
headers->udp.checksum = 0xffff;
}
return 1;
}
static void
bfd_create_frame_to_next_node (vlib_main_t * vm, u32 bi, u32 next_node)
{
vlib_frame_t *f = vlib_get_frame_to_node (vm, next_node);
u32 *to_next = vlib_frame_vector_args (f);
to_next[0] = bi;
f->n_vectors = 1;
vlib_put_frame_to_node (vm, next_node, f);
}
int
bfd_udp_calc_next_node (const struct bfd_session_s *bs, u32 * next_node)
{
vnet_main_t *vnm = vnet_get_main ();
const bfd_udp_session_t *bus = &bs->udp;
ip_adjacency_t *adj = adj_get (bus->adj_index);
/* don't try to send the buffer if the interface is not up */
if (!vnet_sw_interface_is_up (vnm, bus->key.sw_if_index))
return 0;
switch (adj->lookup_next_index)
{
case IP_LOOKUP_NEXT_ARP:
switch (bs->transport)
{
case BFD_TRANSPORT_UDP4:
*next_node = bfd_udp_main.ip4_arp_idx;
return 1;
case BFD_TRANSPORT_UDP6:
*next_node = bfd_udp_main.ip6_ndp_idx;
return 1;
}
break;
case IP_LOOKUP_NEXT_REWRITE:
switch (bs->transport)
{
case BFD_TRANSPORT_UDP4:
*next_node = bfd_udp_main.ip4_rewrite_idx;
return 1;
case BFD_TRANSPORT_UDP6:
*next_node = bfd_udp_main.ip6_rewrite_idx;
return 1;
}
break;
case IP_LOOKUP_NEXT_MIDCHAIN:
switch (bs->transport)
{
case BFD_TRANSPORT_UDP4:
*next_node = bfd_udp_main.ip4_midchain_idx;
return 1;
case BFD_TRANSPORT_UDP6:
*next_node = bfd_udp_main.ip6_midchain_idx;
return 1;
}
break;
default:
/* drop */
break;
}
return 0;
}
int
bfd_transport_udp4 (vlib_main_t * vm, u32 bi, const struct bfd_session_s *bs)
{
u32 next_node;
int rv = bfd_udp_calc_next_node (bs, &next_node);
if (rv)
{
bfd_create_frame_to_next_node (vm, bi, next_node);
}
return rv;
}
int
bfd_transport_udp6 (vlib_main_t * vm, u32 bi, const struct bfd_session_s *bs)
{
u32 next_node;
int rv = bfd_udp_calc_next_node (bs, &next_node);
if (rv)
{
bfd_create_frame_to_next_node (vm, bi, next_node);
}
return 1;
}
static bfd_session_t *
bfd_lookup_session (bfd_udp_main_t * bum, const bfd_udp_key_t * key)
{
uword *p = mhash_get (&bum->bfd_session_idx_by_bfd_key, key);
if (p)
{
return bfd_find_session_by_idx (bum->bfd_main, *p);
}
return 0;
}
static void
bfd_udp_key_init (bfd_udp_key_t * key, u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr)
{
clib_memset (key, 0, sizeof (*key));
key->sw_if_index = sw_if_index;
key->local_addr.as_u64[0] = local_addr->as_u64[0];
key->local_addr.as_u64[1] = local_addr->as_u64[1];
key->peer_addr.as_u64[0] = peer_addr->as_u64[0];
key->peer_addr.as_u64[1] = peer_addr->as_u64[1];
}
static vnet_api_error_t
bfd_udp_add_session_internal (vlib_main_t * vm, bfd_udp_main_t * bum,
u32 sw_if_index, u32 desired_min_tx_usec,
u32 required_min_rx_usec, u8 detect_mult,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr,
bfd_session_t ** bs_out)
{
/* get a pool entry and if we end up not needing it, give it back */
bfd_transport_e t = BFD_TRANSPORT_UDP4;
if (!ip46_address_is_ip4 (local_addr))
{
t = BFD_TRANSPORT_UDP6;
}
bfd_session_t *bs = bfd_get_session (bum->bfd_main, t);
if (!bs)
{
return VNET_API_ERROR_BFD_EAGAIN;
}
bfd_udp_session_t *bus = &bs->udp;
clib_memset (bus, 0, sizeof (*bus));
bfd_udp_key_t *key = &bus->key;
bfd_udp_key_init (key, sw_if_index, local_addr, peer_addr);
const bfd_session_t *tmp = bfd_lookup_session (bum, key);
if (tmp)
{
vlib_log_err (bum->log_class,
"duplicate bfd-udp session, existing bs_idx=%d",
tmp->bs_idx);
bfd_put_session (bum->bfd_main, bs);
return VNET_API_ERROR_BFD_EEXIST;
}
mhash_set (&bum->bfd_session_idx_by_bfd_key, key, bs->bs_idx, NULL);
BFD_DBG ("session created, bs_idx=%u, sw_if_index=%d, local=%U, peer=%U",
bs->bs_idx, key->sw_if_index, format_ip46_address,
&key->local_addr, IP46_TYPE_ANY, format_ip46_address,
&key->peer_addr, IP46_TYPE_ANY);
vlib_log_info (bum->log_class, "create BFD session: %U",
format_bfd_session, bs);
if (BFD_TRANSPORT_UDP4 == t)
{
bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, VNET_LINK_IP4,
&key->peer_addr,
key->sw_if_index);
BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP4, VNET_LINK_IP4, %U, %d) "
"returns %d", format_ip46_address, &key->peer_addr,
IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
++bum->udp4_sessions_count;
if (1 == bum->udp4_sessions_count)
{
udp_register_dst_port (vm, UDP_DST_PORT_bfd4,
bfd_udp4_input_node.index, 1);
udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo4,
bfd_udp_echo4_input_node.index, 1);
}
}
else
{
bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6,
&key->peer_addr,
key->sw_if_index);
BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP6, VNET_LINK_IP6, %U, %d) "
"returns %d", format_ip46_address, &key->peer_addr,
IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
++bum->udp6_sessions_count;
if (1 == bum->udp6_sessions_count)
{
udp_register_dst_port (vm, UDP_DST_PORT_bfd6,
bfd_udp6_input_node.index, 0);
udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo6,
bfd_udp_echo6_input_node.index, 0);
}
}
*bs_out = bs;
return bfd_session_set_params (bum->bfd_main, bs, desired_min_tx_usec,
required_min_rx_usec, detect_mult);
}
static vnet_api_error_t
bfd_udp_validate_api_input (u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr)
{
bfd_udp_main_t *bum = &bfd_udp_main;
vnet_sw_interface_t *sw_if =
vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main, sw_if_index);
u8 local_ip_valid = 0;
ip_interface_address_t *ia = NULL;
if (!sw_if)
{
vlib_log_err (bum->log_class,
"got NULL sw_if when getting interface by index %u",
sw_if_index);
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
}
if (ip46_address_is_ip4 (local_addr))
{
if (!ip46_address_is_ip4 (peer_addr))
{
vlib_log_err (bum->log_class,
"IP family mismatch (local is ipv4, peer is ipv6)");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
ip4_main_t *im = &ip4_main;
/* *INDENT-OFF* */
foreach_ip_interface_address (
&im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
ip4_address_t *x =
ip_interface_address_get_address (&im->lookup_main, ia);
if (x->as_u32 == local_addr->ip4.as_u32)
{
/* valid address for this interface */
local_ip_valid = 1;
break;
}
}));
/* *INDENT-ON* */
}
else
{
if (ip46_address_is_ip4 (peer_addr))
{
vlib_log_err (bum->log_class,
"IP family mismatch (local is ipv6, peer is ipv4)");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
if (ip6_address_is_link_local_unicast (&local_addr->ip6))
{
const ip6_address_t *ll_addr;
ll_addr = ip6_get_link_local_address (sw_if_index);
if (ll_addr && ip6_address_is_equal (ll_addr, &local_addr->ip6))
{
/* valid address for this interface */
local_ip_valid = 1;
}
}
else
{
ip6_main_t *im = &ip6_main;
/* *INDENT-OFF* */
foreach_ip_interface_address (
&im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
ip6_address_t *x =
ip_interface_address_get_address (&im->lookup_main, ia);
if (local_addr->ip6.as_u64[0] == x->as_u64[0] &&
local_addr->ip6.as_u64[1] == x->as_u64[1])
{
/* valid address for this interface */
local_ip_valid = 1;
break;
}
}));
/* *INDENT-ON* */
}
}
if (!local_ip_valid)
{
vlib_log_err (bum->log_class,
"local address %U not found on interface with index %u",
format_ip46_address, local_addr, IP46_TYPE_ANY,
sw_if_index);
return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
}
return 0;
}
static vnet_api_error_t
bfd_udp_find_session_by_api_input (u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr,
bfd_session_t ** bs_out)
{
vnet_api_error_t rv =
bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
if (!rv)
{
bfd_udp_main_t *bum = &bfd_udp_main;
bfd_udp_key_t key;
bfd_udp_key_init (&key, sw_if_index, local_addr, peer_addr);
bfd_session_t *bs = bfd_lookup_session (bum, &key);
if (bs)
{
*bs_out = bs;
}
else
{
vlib_log_err (bum->log_class,
"BFD session not found, sw_if_index=%u, local=%U, peer=%U",
sw_if_index, format_ip46_address, local_addr,
IP46_TYPE_ANY, format_ip46_address, peer_addr,
IP46_TYPE_ANY);
return VNET_API_ERROR_BFD_ENOENT;
}
}
return rv;
}
static vnet_api_error_t
bfd_api_verify_common (u32 sw_if_index, u32 desired_min_tx_usec,
u32 required_min_rx_usec, u8 detect_mult,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr)
{
bfd_udp_main_t *bum = &bfd_udp_main;
vnet_api_error_t rv =
bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
if (rv)
{
return rv;
}
if (detect_mult < 1)
{
vlib_log_err (bum->log_class, "detect_mult < 1");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
if (desired_min_tx_usec < 1)
{
vlib_log_err (bum->log_class, "desired_min_tx_usec < 1");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
return 0;
}
static void
bfd_udp_del_session_internal (vlib_main_t * vm, bfd_session_t * bs)
{
bfd_udp_main_t *bum = &bfd_udp_main;
BFD_DBG ("free bfd-udp session, bs_idx=%d", bs->bs_idx);
mhash_unset (&bum->bfd_session_idx_by_bfd_key, &bs->udp.key, NULL);
adj_unlock (bs->udp.adj_index);
switch (bs->transport)
{
case BFD_TRANSPORT_UDP4:
--bum->udp4_sessions_count;
if (!bum->udp4_sessions_count)
{
udp_unregister_dst_port (vm, UDP_DST_PORT_bfd4, 1);
udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo4, 1);
}
break;
case BFD_TRANSPORT_UDP6:
--bum->udp6_sessions_count;
if (!bum->udp6_sessions_count)
{
udp_unregister_dst_port (vm, UDP_DST_PORT_bfd6, 0);
udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo6, 0);
}
break;
}
bfd_put_session (bum->bfd_main, bs);
}
vnet_api_error_t
bfd_udp_add_session (u32 sw_if_index, const ip46_address_t * local_addr,
const ip46_address_t * peer_addr,
u32 desired_min_tx_usec, u32 required_min_rx_usec,
u8 detect_mult, u8 is_authenticated, u32 conf_key_id,
u8 bfd_key_id)
{
bfd_main_t *bm = &bfd_main;
bfd_lock (bm);
vnet_api_error_t rv =
bfd_api_verify_common (sw_if_index, desired_min_tx_usec,
required_min_rx_usec, detect_mult,
local_addr, peer_addr);
bfd_session_t *bs = NULL;
if (!rv)
{
rv =
bfd_udp_add_session_internal (vlib_get_main (), &bfd_udp_main,
sw_if_index, desired_min_tx_usec,
required_min_rx_usec, detect_mult,
local_addr, peer_addr, &bs);
}
if (!rv && is_authenticated)
{
rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id,
0 /* is not delayed */ );
if (rv)
{
bfd_udp_del_session_internal (vlib_get_main (), bs);
}
}
if (!rv)
{
bfd_session_start (bfd_udp_main.bfd_main, bs);
}
bfd_unlock (bm);
return rv;
}
vnet_api_error_t
bfd_udp_mod_session (u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr,
u32 desired_min_tx_usec,
u32 required_min_rx_usec, u8 detect_mult)
{
bfd_session_t *bs = NULL;
bfd_main_t *bm = &bfd_main;
vnet_api_error_t error;
bfd_lock (bm);
vnet_api_error_t rv =
bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
&bs);
if (rv)
{
bfd_unlock (bm);
return rv;
}
error = bfd_session_set_params (bfd_udp_main.bfd_main, bs,
desired_min_tx_usec, required_min_rx_usec,
detect_mult);
bfd_unlock (bm);
return error;
}
vnet_api_error_t
bfd_udp_del_session (u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr)
{
bfd_session_t *bs = NULL;
bfd_main_t *bm = &bfd_main;
bfd_lock (bm);
vnet_api_error_t rv =
bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
&bs);
if (rv)
{
bfd_unlock (bm);
return rv;
}
bfd_udp_del_session_internal (vlib_get_main (), bs);
bfd_unlock (bm);
return 0;
}
vnet_api_error_t
bfd_udp_session_set_flags (vlib_main_t * vm, u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr, u8 admin_up_down)
{
bfd_session_t *bs = NULL;
bfd_main_t *bm = &bfd_main;
bfd_lock (bm);
vnet_api_error_t rv =
bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
&bs);
if (rv)
{
bfd_unlock (bm);
return rv;
}
bfd_session_set_flags (vm, bs, admin_up_down);
bfd_unlock (bm);
return 0;
}
vnet_api_error_t
bfd_udp_auth_activate (u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr,
u32 conf_key_id, u8 key_id, u8 is_delayed)
{
bfd_main_t *bm = &bfd_main;
bfd_lock (bm);
vnet_api_error_t error;
bfd_session_t *bs = NULL;
vnet_api_error_t rv =
bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
&bs);
if (rv)
{
bfd_unlock (bm);
return rv;
}
error = bfd_auth_activate (bs, conf_key_id, key_id, is_delayed);
bfd_unlock (bm);
return error;
}
vnet_api_error_t
bfd_udp_auth_deactivate (u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr, u8 is_delayed)
{
bfd_main_t *bm = &bfd_main;
vnet_api_error_t error;
bfd_lock (bm);
bfd_session_t *bs = NULL;
vnet_api_error_t rv =
bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
&bs);
if (rv)
{
bfd_unlock (bm);
return rv;
}
error = bfd_auth_deactivate (bs, is_delayed);
bfd_unlock (bm);
return error;
}
typedef enum
{
BFD_UDP_INPUT_NEXT_NORMAL,
BFD_UDP_INPUT_NEXT_REPLY_ARP,
BFD_UDP_INPUT_NEXT_REPLY_REWRITE,
BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN,
BFD_UDP_INPUT_N_NEXT,
} bfd_udp_input_next_t;
/* Packet counters - BFD control frames */
#define foreach_bfd_udp_error(F) \
F (NONE, "good bfd packets (processed)") \
F (BAD, "invalid bfd packets")
#define F(sym, string) static char BFD_UDP_ERR_##sym##_STR[] = string;
foreach_bfd_udp_error (F);
#undef F
static char *bfd_udp_error_strings[] = {
#define F(sym, string) BFD_UDP_ERR_##sym##_STR,
foreach_bfd_udp_error (F)
#undef F
};
typedef enum
{
#define F(sym, str) BFD_UDP_ERROR_##sym,
foreach_bfd_udp_error (F)
#undef F
BFD_UDP_N_ERROR,
} bfd_udp_error_t;
typedef enum
{
BFD_UDP_ECHO_INPUT_NEXT_NORMAL,
BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP,
BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE,
BFD_UDP_ECHO_INPUT_N_NEXT,
} bfd_udp_echo_input_next_t;
/* Packet counters - BFD ECHO packets */
#define foreach_bfd_udp_echo_error(F) \
F (NONE, "good bfd echo packets (processed)") \
F (BAD, "invalid bfd echo packets")
#define F(sym, string) static char BFD_UDP_ECHO_ERR_##sym##_STR[] = string;
foreach_bfd_udp_echo_error (F);
#undef F
static char *bfd_udp_echo_error_strings[] = {
#define F(sym, string) BFD_UDP_ECHO_ERR_##sym##_STR,
foreach_bfd_udp_echo_error (F)
#undef F
};
typedef enum
{
#define F(sym, str) BFD_UDP_ECHO_ERROR_##sym,
foreach_bfd_udp_echo_error (F)
#undef F
BFD_UDP_ECHO_N_ERROR,
} bfd_udp_echo_error_t;
static void
bfd_udp4_find_headers (vlib_buffer_t * b, ip4_header_t ** ip4,
udp_header_t ** udp)
{
/* sanity check first */
const i32 start = vnet_buffer (b)->l3_hdr_offset;
if (start < 0 && start < sizeof (b->pre_data))
{
BFD_ERR ("Start of ip header is before pre_data, ignoring");
*ip4 = NULL;
*udp = NULL;
return;
}
*ip4 = (ip4_header_t *) (b->data + start);
if ((u8 *) * ip4 > (u8 *) vlib_buffer_get_current (b))
{
BFD_ERR ("Start of ip header is beyond current data, ignoring");
*ip4 = NULL;
*udp = NULL;
return;
}
*udp = (udp_header_t *) ((*ip4) + 1);
}
static bfd_udp_error_t
bfd_udp4_verify_transport (const ip4_header_t * ip4,
const udp_header_t * udp, const bfd_session_t * bs)
{
const bfd_udp_session_t *bus = &bs->udp;
const bfd_udp_key_t *key = &bus->key;
if (ip4->src_address.as_u32 != key->peer_addr.ip4.as_u32)
{
BFD_ERR ("IPv4 src addr mismatch, got %U, expected %U",
format_ip4_address, ip4->src_address.as_u8, format_ip4_address,
key->peer_addr.ip4.as_u8);
return BFD_UDP_ERROR_BAD;
}
if (ip4->dst_address.as_u32 != key->local_addr.ip4.as_u32)
{
BFD_ERR ("IPv4 dst addr mismatch, got %U, expected %U",
format_ip4_address, ip4->dst_address.as_u8, format_ip4_address,
key->local_addr.ip4.as_u8);
return BFD_UDP_ERROR_BAD;
}
const u8 expected_ttl = 255;
if (ip4->ttl != expected_ttl)
{
BFD_ERR ("IPv4 unexpected TTL value %u, expected %u", ip4->ttl,
expected_ttl);
return BFD_UDP_ERROR_BAD;
}
if (clib_net_to_host_u16 (udp->src_port) < 49152)
{
BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
udp->src_port);
}
return BFD_UDP_ERROR_NONE;
}
typedef struct
{
u32 bs_idx;
bfd_pkt_t pkt;
} bfd_rpc_update_t;
static void
bfd_rpc_update_session (vlib_main_t * vm, u32 bs_idx, const bfd_pkt_t * pkt)
{
bfd_main_t *bm = &bfd_main;
bfd_lock (bm);
bfd_consume_pkt (vm, bm, pkt, bs_idx);
bfd_unlock (bm);
}
static bfd_udp_error_t
bfd_udp4_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
vlib_buffer_t * b, bfd_session_t ** bs_out)
{
const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
if (sizeof (*pkt) > b->current_length)
{
BFD_ERR
("Payload size %d too small to hold bfd packet of minimum size %d",
b->current_length, sizeof (*pkt));
return BFD_UDP_ERROR_BAD;
}
ip4_header_t *ip4;
udp_header_t *udp;
bfd_udp4_find_headers (b, &ip4, &udp);
if (!ip4 || !udp)
{
BFD_ERR ("Couldn't find ip4 or udp header");
return BFD_UDP_ERROR_BAD;
}
const u32 udp_payload_length = udp->length - sizeof (*udp);
if (pkt->head.length > udp_payload_length)
{
BFD_ERR
("BFD packet length is larger than udp payload length (%u > %u)",
pkt->head.length, udp_payload_length);
return BFD_UDP_ERROR_BAD;
}
if (!bfd_verify_pkt_common (pkt))
{
return BFD_UDP_ERROR_BAD;
}
bfd_session_t *bs = NULL;
if (pkt->your_disc)
{
BFD_DBG ("Looking up BFD session using discriminator %u",
pkt->your_disc);
bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
}
else
{
bfd_udp_key_t key;
clib_memset (&key, 0, sizeof (key));
key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
key.local_addr.ip4.as_u32 = ip4->dst_address.as_u32;
key.peer_addr.ip4.as_u32 = ip4->src_address.as_u32;
BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
"peer=%U)",
key.sw_if_index, format_ip4_address, key.local_addr.ip4.as_u8,
format_ip4_address, key.peer_addr.ip4.as_u8);
bs = bfd_lookup_session (&bfd_udp_main, &key);
}
if (!bs)
{
BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
return BFD_UDP_ERROR_BAD;
}
BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
if (!bfd_verify_pkt_auth (vm, pkt, b->current_length, bs))
{
BFD_ERR ("Packet verification failed, dropping packet");
return BFD_UDP_ERROR_BAD;
}
bfd_udp_error_t err;
if (BFD_UDP_ERROR_NONE != (err = bfd_udp4_verify_transport (ip4, udp, bs)))
{
return err;
}
bfd_rpc_update_session (vm, bs->bs_idx, pkt);
*bs_out = bs;
return BFD_UDP_ERROR_NONE;
}
static void
bfd_udp6_find_headers (vlib_buffer_t * b, ip6_header_t ** ip6,
udp_header_t ** udp)
{
/* sanity check first */
const i32 start = vnet_buffer (b)->l3_hdr_offset;
if (start < 0 && start < sizeof (b->pre_data))
{
BFD_ERR ("Start of ip header is before pre_data, ignoring");
*ip6 = NULL;
*udp = NULL;
return;
}
*ip6 = (ip6_header_t *) (b->data + start);
if ((u8 *) * ip6 > (u8 *) vlib_buffer_get_current (b))
{
BFD_ERR ("Start of ip header is beyond current data, ignoring");
*ip6 = NULL;
*udp = NULL;
return;
}
if ((*ip6)->protocol != IP_PROTOCOL_UDP)
{
BFD_ERR ("Unexpected protocol in IPv6 header '%u', expected '%u' (== "
"IP_PROTOCOL_UDP)", (*ip6)->protocol, IP_PROTOCOL_UDP);
*ip6 = NULL;
*udp = NULL;
return;
}
*udp = (udp_header_t *) ((*ip6) + 1);
}
static bfd_udp_error_t
bfd_udp6_verify_transport (const ip6_header_t * ip6,
const udp_header_t * udp, const bfd_session_t * bs)
{
const bfd_udp_session_t *bus = &bs->udp;
const bfd_udp_key_t *key = &bus->key;
if (ip6->src_address.as_u64[0] != key->peer_addr.ip6.as_u64[0] &&
ip6->src_address.as_u64[1] != key->peer_addr.ip6.as_u64[1])
{
BFD_ERR ("IP src addr mismatch, got %U, expected %U",
format_ip6_address, ip6, format_ip6_address,
&key->peer_addr.ip6);
return BFD_UDP_ERROR_BAD;
}
if (ip6->dst_address.as_u64[0] != key->local_addr.ip6.as_u64[0] &&
ip6->dst_address.as_u64[1] != key->local_addr.ip6.as_u64[1])
{
BFD_ERR ("IP dst addr mismatch, got %U, expected %U",
format_ip6_address, ip6, format_ip6_address,
&key->local_addr.ip6);
return BFD_UDP_ERROR_BAD;
}
const u8 expected_hop_limit = 255;
if (ip6->hop_limit != expected_hop_limit)
{
BFD_ERR ("IPv6 unexpected hop-limit value %u, expected %u",
ip6->hop_limit, expected_hop_limit);
return BFD_UDP_ERROR_BAD;
}
if (clib_net_to_host_u16 (udp->src_port) < 49152)
{
BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>",
udp->src_port);
}
return BFD_UDP_ERROR_NONE;
}
static bfd_udp_error_t
bfd_udp6_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
vlib_buffer_t * b, bfd_session_t ** bs_out)
{
const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
if (sizeof (*pkt) > b->current_length)
{
BFD_ERR
("Payload size %d too small to hold bfd packet of minimum size %d",
b->current_length, sizeof (*pkt));
return BFD_UDP_ERROR_BAD;
}
ip6_header_t *ip6;
udp_header_t *udp;
bfd_udp6_find_headers (b, &ip6, &udp);
if (!ip6 || !udp)
{
BFD_ERR ("Couldn't find ip6 or udp header");
return BFD_UDP_ERROR_BAD;
}
const u32 udp_payload_length = udp->length - sizeof (*udp);
if (pkt->head.length > udp_payload_length)
{
BFD_ERR
("BFD packet length is larger than udp payload length (%u > %u)",
pkt->head.length, udp_payload_length);
return BFD_UDP_ERROR_BAD;
}
if (!bfd_verify_pkt_common (pkt))
{
return BFD_UDP_ERROR_BAD;
}
bfd_session_t *bs = NULL;
if (pkt->your_disc)
{
BFD_DBG ("Looking up BFD session using discriminator %u",
pkt->your_disc);
bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
}
else
{
bfd_udp_key_t key;
clib_memset (&key, 0, sizeof (key));
key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
key.local_addr.ip6.as_u64[0] = ip6->dst_address.as_u64[0];
key.local_addr.ip6.as_u64[1] = ip6->dst_address.as_u64[1];
key.peer_addr.ip6.as_u64[0] = ip6->src_address.as_u64[0];
key.peer_addr.ip6.as_u64[1] = ip6->src_address.as_u64[1];
BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
"peer=%U)",
key.sw_if_index, format_ip6_address, &key.local_addr,
format_ip6_address, &key.peer_addr);
bs = bfd_lookup_session (&bfd_udp_main, &key);
}
if (!bs)
{
BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
return BFD_UDP_ERROR_BAD;
}
BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
if (!bfd_verify_pkt_auth (vm, pkt, b->current_length, bs))
{
BFD_ERR ("Packet verification failed, dropping packet");
return BFD_UDP_ERROR_BAD;
}
bfd_udp_error_t err;
if (BFD_UDP_ERROR_NONE != (err = bfd_udp6_verify_transport (ip6, udp, bs)))
{
return err;
}
bfd_rpc_update_session (vm, bs->bs_idx, pkt);
*bs_out = bs;
return BFD_UDP_ERROR_NONE;
}
/*
* Process a frame of bfd packets
* Expect 1 packet / frame
*/
static uword
bfd_udp_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
vlib_frame_t * f, int is_ipv6)
{
u32 n_left_from, *from;
bfd_input_trace_t *t0;
bfd_main_t *bm = &bfd_main;
from = vlib_frame_vector_args (f); /* array of buffer indices */
n_left_from = f->n_vectors; /* number of buffer indices */
while (n_left_from > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0, error0;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
bfd_session_t *bs = NULL;
/* If this pkt is traced, snapshot the data */
if (b0->flags & VLIB_BUFFER_IS_TRACED)
{
int len;
t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
: sizeof (t0->data);
t0->len = len;
clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), len);
}
/* scan this bfd pkt. error0 is the counter index to bmp */
bfd_lock (bm);
if (is_ipv6)
{
error0 = bfd_udp6_scan (vm, rt, b0, &bs);
}
else
{
error0 = bfd_udp4_scan (vm, rt, b0, &bs);
}
b0->error = rt->errors[error0];
next0 = BFD_UDP_INPUT_NEXT_NORMAL;
if (BFD_UDP_ERROR_NONE == error0)
{
/*
* if everything went fine, check for poll bit, if present, re-use
* the buffer and based on (now updated) session parameters, send
* the final packet back
*/
const bfd_pkt_t *pkt = vlib_buffer_get_current (b0);
if (bfd_pkt_get_poll (pkt))
{
b0->current_data = 0;
b0->current_length = 0;
bfd_init_final_control_frame (vm, b0, bfd_udp_main.bfd_main, bs,
0);
if (is_ipv6)
{
vlib_node_increment_counter (vm, bfd_udp6_input_node.index,
b0->error, 1);
}
else
{
vlib_node_increment_counter (vm, bfd_udp4_input_node.index,
b0->error, 1);
}
const bfd_udp_session_t *bus = &bs->udp;
ip_adjacency_t *adj = adj_get (bus->adj_index);
switch (adj->lookup_next_index)
{
case IP_LOOKUP_NEXT_ARP:
next0 = BFD_UDP_INPUT_NEXT_REPLY_ARP;
break;
case IP_LOOKUP_NEXT_REWRITE:
next0 = BFD_UDP_INPUT_NEXT_REPLY_REWRITE;
break;
case IP_LOOKUP_NEXT_MIDCHAIN:
next0 = BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN;
break;
default:
/* drop */
break;
}
}
}
bfd_unlock (bm);
vlib_set_next_frame_buffer (vm, rt, next0, bi0);
from += 1;
n_left_from -= 1;
}
return f->n_vectors;
}
static uword
bfd_udp4_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
{
return bfd_udp_input (vm, rt, f, 0);
}
/*
* bfd input graph node declaration
*/
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (bfd_udp4_input_node, static) = {
.function = bfd_udp4_input,
.name = "bfd-udp4-input",
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = BFD_UDP_N_ERROR,
.error_strings = bfd_udp_error_strings,
.format_trace = bfd_input_format_trace,
.n_next_nodes = BFD_UDP_INPUT_N_NEXT,
.next_nodes =
{
[BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
[BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
[BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
[BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip4-midchain",
},
};
/* *INDENT-ON* */
static uword
bfd_udp6_input (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
{
return bfd_udp_input (vm, rt, f, 1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (bfd_udp6_input_node, static) = {
.function = bfd_udp6_input,
.name = "bfd-udp6-input",
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = BFD_UDP_N_ERROR,
.error_strings = bfd_udp_error_strings,
.format_trace = bfd_input_format_trace,
.n_next_nodes = BFD_UDP_INPUT_N_NEXT,
.next_nodes =
{
[BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
[BFD_UDP_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
[BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
[BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip6-midchain",
},
};
/* *INDENT-ON* */
/*
* Process a frame of bfd echo packets
* Expect 1 packet / frame
*/
static uword
bfd_udp_echo_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
vlib_frame_t * f, int is_ipv6)
{
u32 n_left_from, *from;
bfd_input_trace_t *t0;
bfd_main_t *bm = &bfd_main;
from = vlib_frame_vector_args (f); /* array of buffer indices */
n_left_from = f->n_vectors; /* number of buffer indices */
while (n_left_from > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
/* If this pkt is traced, snapshot the data */
if (b0->flags & VLIB_BUFFER_IS_TRACED)
{
int len;
t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
: sizeof (t0->data);
t0->len = len;
clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), len);
}
bfd_lock (bm);
if (bfd_consume_echo_pkt (vm, bfd_udp_main.bfd_main, b0))
{
b0->error = rt->errors[BFD_UDP_ERROR_NONE];
next0 = BFD_UDP_ECHO_INPUT_NEXT_NORMAL;
}
else
{
/* loop back the packet */
b0->error = rt->errors[BFD_UDP_ERROR_NONE];
if (is_ipv6)
{
vlib_node_increment_counter (vm, bfd_udp_echo6_input_node.index,
b0->error, 1);
}
else
{
vlib_node_increment_counter (vm, bfd_udp_echo4_input_node.index,
b0->error, 1);
}
next0 = BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE;
}
bfd_unlock (bm);
vlib_set_next_frame_buffer (vm, rt, next0, bi0);
from += 1;
n_left_from -= 1;
}
return f->n_vectors;
}
static uword
bfd_udp_echo4_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
vlib_frame_t * f)
{
return bfd_udp_echo_input (vm, rt, f, 0);
}
u8 *
bfd_echo_input_format_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
const bfd_udp_echo_input_trace_t *t =
va_arg (*args, bfd_udp_echo_input_trace_t *);
if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
{
s = format (s, "BFD ECHO:\n");
s = format (s, " data: %U", format_hexdump, t->data, t->len);
}
return s;
}
/*
* bfd input graph node declaration
*/
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (bfd_udp_echo4_input_node, static) = {
.function = bfd_udp_echo4_input,
.name = "bfd-udp-echo4-input",
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = BFD_UDP_ECHO_N_ERROR,
.error_strings = bfd_udp_error_strings,
.format_trace = bfd_echo_input_format_trace,
.n_next_nodes = BFD_UDP_ECHO_INPUT_N_NEXT,
.next_nodes =
{
[BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop",
[BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip4-arp",
[BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup",
},
};
/* *INDENT-ON* */
static uword
bfd_udp_echo6_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
vlib_frame_t * f)
{
return bfd_udp_echo_input (vm, rt, f, 1);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (bfd_udp_echo6_input_node, static) = {
.function = bfd_udp_echo6_input,
.name = "bfd-udp-echo6-input",
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = BFD_UDP_ECHO_N_ERROR,
.error_strings = bfd_udp_echo_error_strings,
.format_trace = bfd_echo_input_format_trace,
.n_next_nodes = BFD_UDP_ECHO_INPUT_N_NEXT,
.next_nodes =
{
[BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop",
[BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor",
[BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup",
},
};
/* *INDENT-ON* */
static clib_error_t *
bfd_udp_sw_if_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_create)
{
bfd_session_t **to_be_freed = NULL;
bfd_udp_main_t *bum = &bfd_udp_main;
BFD_DBG ("sw_if_add_del called, sw_if_index=%u, is_create=%u", sw_if_index,
is_create);
if (!is_create)
{
bfd_session_t *bs;
pool_foreach (bs, bfd_udp_main.bfd_main->sessions)
{
if (bs->transport != BFD_TRANSPORT_UDP4 &&
bs->transport != BFD_TRANSPORT_UDP6)
{
continue;
}
if (bs->udp.key.sw_if_index != sw_if_index)
{
continue;
}
vec_add1 (to_be_freed, bs);
}
}
bfd_session_t **bs;
vec_foreach (bs, to_be_freed)
{
vlib_log_notice (bum->log_class,
"removal of sw_if_index=%u forces removal of bfd session "
"with bs_idx=%u", sw_if_index, (*bs)->bs_idx);
bfd_session_set_flags (vlib_get_main (), *bs, 0);
bfd_udp_del_session_internal (vlib_get_main (), *bs);
}
return 0;
}
VNET_SW_INTERFACE_ADD_DEL_FUNCTION (bfd_udp_sw_if_add_del);
/*
* setup function
*/
static clib_error_t *
bfd_udp_init (vlib_main_t * vm)
{
bfd_udp_main.udp4_sessions_count = 0;
bfd_udp_main.udp6_sessions_count = 0;
mhash_init (&bfd_udp_main.bfd_session_idx_by_bfd_key, sizeof (uword),
sizeof (bfd_udp_key_t));
bfd_udp_main.bfd_main = &bfd_main;
bfd_udp_main.vnet_main = vnet_get_main ();
vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip4-arp");
ASSERT (node);
bfd_udp_main.ip4_arp_idx = node->index;
node = vlib_get_node_by_name (vm, (u8 *) "ip6-discover-neighbor");
ASSERT (node);
bfd_udp_main.ip6_ndp_idx = node->index;
node = vlib_get_node_by_name (vm, (u8 *) "ip4-rewrite");
ASSERT (node);
bfd_udp_main.ip4_rewrite_idx = node->index;
node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite");
ASSERT (node);
bfd_udp_main.ip6_rewrite_idx = node->index;
node = vlib_get_node_by_name (vm, (u8 *) "ip4-midchain");
ASSERT (node);
bfd_udp_main.ip4_midchain_idx = node->index;
node = vlib_get_node_by_name (vm, (u8 *) "ip6-midchain");
ASSERT (node);
bfd_udp_main.ip6_midchain_idx = node->index;
bfd_udp_main.log_class = vlib_log_register_class ("bfd", "udp");
vlib_log_debug (bfd_udp_main.log_class, "initialized");
return 0;
}
VLIB_INIT_FUNCTION (bfd_udp_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/