+/*
+ * 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>
#include <vlib/buffer.h>
#include <vnet/ip/format.h>
#include <vnet/ethernet/packet.h>
-#include <vnet/ip/udp_packet.h>
+#include <vnet/udp/udp_packet.h>
+#include <vnet/udp/udp.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/udp.h>
#include <vnet/ip/ip6_packet.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>
/* 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;
} 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;
-void
+vnet_api_error_t
+bfd_udp_set_echo_source (u32 sw_if_index)
+{
+ vnet_sw_interface_t *sw_if =
+ vnet_get_sw_interface_safe (bfd_udp_main.vnet_main,
+ bfd_udp_main.echo_source_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)
+ {
+ 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_safe (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* */
+ }
+ }
+ 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);
+}
+
+static void
+lol ()
+{
+}
+
+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 */
+ lol ();
+ return 1;
+ }
+ }));
+ /* *INDENT-ON* */
+ BFD_ERR ("cannot find ip6 address, no usable address found");
+ return 0;
+}
+
+int
bfd_add_udp4_transport (vlib_main_t * vm, vlib_buffer_t * b,
- bfd_udp_session_t * bus)
+ const bfd_session_t * bs, int is_echo)
{
- udp_header_t *udp;
+ const bfd_udp_session_t *bus = &bs->udp;
const bfd_udp_key_t *key = &bus->key;
b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
- ip4_header_t *ip4;
- const size_t headers_size = sizeof (*ip4) + sizeof (*udp);
- vlib_buffer_advance (b, -headers_size);
- ip4 = vlib_buffer_get_current (b);
- udp = (udp_header_t *) (ip4 + 1);
- memset (ip4, 0, headers_size);
- ip4->ip_version_and_header_length = 0x45;
- ip4->ttl = 255;
- ip4->protocol = IP_PROTOCOL_UDP;
- ip4->src_address.as_u32 = key->local_addr.ip4.as_u32;
- ip4->dst_address.as_u32 = key->peer_addr.ip4.as_u32;
-
- udp->src_port = clib_host_to_net_u16 (50000); /* FIXME */
- udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4);
+ 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);
+ 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);
- ip4->length = clib_host_to_net_u16 (ip_length);
- ip4->checksum = ip4_header_checksum (ip4);
+ 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 (*ip4));
- udp->length = clib_host_to_net_u16 (udp_length);
+ const u16 udp_length = ip_length - (sizeof (headers->ip4));
+ headers->udp.length = clib_host_to_net_u16 (udp_length);
+ return 1;
}
-void
+int
bfd_add_udp6_transport (vlib_main_t * vm, vlib_buffer_t * b,
- bfd_udp_session_t * bus)
+ const bfd_session_t * bs, int is_echo)
{
- udp_header_t *udp;
+ const bfd_udp_session_t *bus = &bs->udp;
const bfd_udp_key_t *key = &bus->key;
b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
- ip6_header_t *ip6;
- const size_t headers_size = sizeof (*ip6) + sizeof (*udp);
- vlib_buffer_advance (b, -headers_size);
- ip6 = vlib_buffer_get_current (b);
- udp = (udp_header_t *) (ip6 + 1);
- memset (ip6, 0, headers_size);
- ip6->ip_version_traffic_class_and_flow_label =
+ 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);
+ memset (headers, 0, sizeof (*headers));
+ headers->ip6.ip_version_traffic_class_and_flow_label =
clib_host_to_net_u32 (0x6 << 28);
- ip6->hop_limit = 255;
- ip6->protocol = IP_PROTOCOL_UDP;
- clib_memcpy (&ip6->src_address, &key->local_addr.ip6,
- sizeof (ip6->src_address));
- clib_memcpy (&ip6->dst_address, &key->peer_addr.ip6,
- sizeof (ip6->dst_address));
+ 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 (&headers->ip6.dst_address, &key->local_addr.ip6,
+ sizeof (headers->ip6.dst_address));
- udp->src_port = clib_host_to_net_u16 (50000); /* FIXME */
- udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd6);
+ headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo6);
+ }
+ else
+ {
+ clib_memcpy (&headers->ip6.src_address, &key->local_addr.ip6,
+ sizeof (headers->ip6.src_address));
+ clib_memcpy (&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 (*ip6));
- udp->length = clib_host_to_net_u16 (udp_length);
- ip6->payload_length = 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;
- udp->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus);
+ headers->udp.checksum =
+ ip6_tcp_udp_icmp_compute_checksum (vm, b, &headers->ip6, &bogus);
ASSERT (bogus == 0);
- if (udp->checksum == 0)
+ if (headers->udp.checksum == 0)
{
- udp->checksum = 0xffff;
+ headers->udp.checksum = 0xffff;
}
+ return 1;
}
static bfd_session_t *
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)
+{
+ 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 (bfd_udp_main_t * bum, u32 sw_if_index,
- u32 desired_min_tx_us, u32 required_min_rx_us,
- u8 detect_mult,
+ 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,
- u32 * bs_index)
+ bfd_session_t ** bs_out)
{
- vnet_sw_interface_t *sw_if =
- vnet_get_sw_interface (vnet_get_main (), sw_if_index);
/* get a pool entry and if we end up not needing it, give it back */
- bfd_transport_t t = BFD_TRANSPORT_UDP4;
+ 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)
+ {
+ bfd_put_session (bum->bfd_main, bs);
+ return VNET_API_ERROR_BFD_EAGAIN;
+ }
bfd_udp_session_t *bus = &bs->udp;
memset (bus, 0, sizeof (*bus));
bfd_udp_key_t *key = &bus->key;
- key->sw_if_index = sw_if->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];
+ bfd_udp_key_init (key, sw_if_index, local_addr, peer_addr);
const bfd_session_t *tmp = bfd_lookup_session (bum, key);
if (tmp)
{
- BFD_ERR ("duplicate bfd-udp session, existing bs_idx=%d", tmp->bs_idx);
+ clib_warning ("duplicate bfd-udp session, existing bs_idx=%d",
+ tmp->bs_idx);
bfd_put_session (bum->bfd_main, bs);
return VNET_API_ERROR_BFD_EEXIST;
}
- key->sw_if_index = sw_if->sw_if_index;
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,
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);
+
+ fib_prefix_t fib_prefix;
+ memset (&fib_prefix, 0, sizeof (fib_prefix));
+ fib_prefix.fp_len = 0;
+ fib_prefix.fp_proto = FIB_PROTOCOL_IP4;
+ fib_prefix.fp_addr = key->local_addr;
+ u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, 0); /* FIXME table id 0? */
+ dpo_id_t dpo = DPO_INVALID;
+ dpo_proto_t dproto;
+ dproto = fib_proto_to_dpo (fib_prefix.fp_proto);
+ receive_dpo_add_or_lock (dproto, ~0, NULL, &dpo);
+ fib_table_entry_special_dpo_update (fib_index, &fib_prefix,
+ FIB_SOURCE_API,
+ FIB_ENTRY_FLAG_LOCAL, &dpo);
+ dpo_reset (&dpo);
}
else
{
"returns %d", format_ip46_address, &key->peer_addr,
IP46_TYPE_ANY, key->sw_if_index, bus->adj_index);
}
- bs->config_desired_min_tx_us = desired_min_tx_us;
- bs->required_min_rx_us = required_min_rx_us;
- bs->required_min_echo_rx_us = required_min_rx_us; /* FIXME */
- bs->local_detect_mult = detect_mult;
- bfd_session_start (bum->bfd_main, bs);
- *bs_index = bs->bs_idx;
- return 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
const ip46_address_t * peer_addr)
{
vnet_sw_interface_t *sw_if =
- vnet_get_sw_interface (vnet_get_main (), sw_if_index);
+ vnet_get_sw_interface_safe (bfd_udp_main.vnet_main, sw_if_index);
u8 local_ip_valid = 0;
ip_interface_address_t *ia = NULL;
if (!sw_if)
{
- BFD_ERR ("got NULL sw_if");
+ clib_warning ("got NULL sw_if");
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
}
if (ip46_address_is_ip4 (local_addr))
{
if (!ip46_address_is_ip4 (peer_addr))
{
- BFD_ERR ("IP family mismatch");
+ clib_warning ("IP family mismatch");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
ip4_main_t *im = &ip4_main;
{
if (ip46_address_is_ip4 (peer_addr))
{
- BFD_ERR ("IP family mismatch");
+ clib_warning ("IP family mismatch");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
ip6_main_t *im = &ip6_main;
if (!local_ip_valid)
{
- BFD_ERR ("address not found on interface");
+ clib_warning ("address not found on interface");
return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
}
return 0;
}
-vnet_api_error_t
-bfd_udp_add_session (u32 sw_if_index, u32 desired_min_tx_us,
- u32 required_min_rx_us, u8 detect_mult,
- const ip46_address_t * local_addr,
- const ip46_address_t * peer_addr, u32 * bs_index)
+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
+ {
+ clib_warning
+ ("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)
{
vnet_api_error_t rv =
bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
}
if (detect_mult < 1)
{
- BFD_ERR ("detect_mult < 1");
+ clib_warning ("detect_mult < 1");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
- if (desired_min_tx_us < 1)
+ if (desired_min_tx_usec < 1)
{
- BFD_ERR ("desired_min_tx_us < 1");
+ clib_warning ("desired_min_tx_usec < 1");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
- return bfd_udp_add_session_internal (&bfd_udp_main, sw_if_index,
- desired_min_tx_us, required_min_rx_us,
- detect_mult, local_addr, peer_addr,
- bs_index);
+ return 0;
+}
+
+static void
+bfd_udp_del_session_internal (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);
+ 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)
+{
+ 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 (&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)
+ {
+#if WITH_LIBSSL > 0
+ rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id,
+ 0 /* is not delayed */ );
+#else
+ clib_warning ("SSL missing, cannot add authenticated BFD session");
+ rv = VNET_API_ERROR_BFD_NOTSUPP;
+#endif
+ if (rv)
+ {
+ bfd_udp_del_session_internal (bs);
+ }
+ }
+ if (!rv)
+ {
+ bfd_session_start (bfd_udp_main.bfd_main, bs);
+ }
+
+ 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;
+ vnet_api_error_t rv =
+ bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
+ &bs);
+ if (rv)
+ {
+ return rv;
+ }
+
+ return bfd_session_set_params (bfd_udp_main.bfd_main, bs,
+ desired_min_tx_usec, required_min_rx_usec,
+ detect_mult);
}
vnet_api_error_t
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr)
{
+ 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)
+ {
+ return rv;
+ }
+ bfd_udp_del_session_internal (bs);
+ return 0;
+}
+
+vnet_api_error_t
+bfd_udp_session_set_flags (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;
vnet_api_error_t rv =
- bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
+ bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
+ &bs);
if (rv)
{
return rv;
}
- bfd_udp_main_t *bum = &bfd_udp_main;
- vnet_sw_interface_t *sw_if =
- vnet_get_sw_interface (vnet_get_main (), sw_if_index);
- bfd_udp_key_t key;
- memset (&key, 0, sizeof (key));
- key.sw_if_index = sw_if->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];
- bfd_session_t *tmp = bfd_lookup_session (bum, &key);
- if (tmp)
+ bfd_session_set_flags (bs, admin_up_down);
+ return 0;
+}
+
+vnet_api_error_t
+bfd_auth_set_key (u32 conf_key_id, u8 auth_type, u8 key_len,
+ const u8 * key_data)
+{
+#if WITH_LIBSSL > 0
+ bfd_auth_key_t *auth_key = NULL;
+ if (!key_len || key_len > bfd_max_len_for_auth_type (auth_type))
{
- BFD_DBG ("free bfd-udp session, bs_idx=%d", tmp->bs_idx);
- mhash_unset (&bum->bfd_session_idx_by_bfd_key, &key, NULL);
- adj_unlock (tmp->udp.adj_index);
- bfd_put_session (bum->bfd_main, tmp);
+ clib_warning ("Invalid authentication key length for auth_type=%d:%s "
+ "(key_len=%u, must be "
+ "non-zero, expected max=%u)",
+ auth_type, bfd_auth_type_str (auth_type), key_len,
+ (u32) bfd_max_len_for_auth_type (auth_type));
+ return VNET_API_ERROR_INVALID_VALUE;
+ }
+ if (!bfd_auth_type_supported (auth_type))
+ {
+ clib_warning ("Unsupported auth type=%d:%s", auth_type,
+ bfd_auth_type_str (auth_type));
+ return VNET_API_ERROR_BFD_NOTSUPP;
+ }
+ bfd_main_t *bm = bfd_udp_main.bfd_main;
+ uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
+ if (key_idx_p)
+ {
+ /* modifying existing key - must not be used */
+ const uword key_idx = *key_idx_p;
+ auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
+ if (auth_key->use_count > 0)
+ {
+ clib_warning ("Authentication key with conf ID %u in use by %u BFD "
+ "sessions - cannot modify",
+ conf_key_id, auth_key->use_count);
+ return VNET_API_ERROR_BFD_EINUSE;
+ }
}
else
{
- BFD_ERR ("no such session");
- return VNET_API_ERROR_BFD_NOENT;
+ /* adding new key */
+ pool_get (bm->auth_keys, auth_key);
+ auth_key->conf_key_id = conf_key_id;
+ hash_set (bm->auth_key_by_conf_key_id, conf_key_id,
+ auth_key - bm->auth_keys);
}
+ auth_key->auth_type = auth_type;
+ memset (auth_key->key, 0, sizeof (auth_key->key));
+ clib_memcpy (auth_key->key, key_data, key_len);
return 0;
+#else
+ clib_warning ("SSL missing, cannot manipulate authentication keys");
+ return VNET_API_ERROR_BFD_NOTSUPP;
+#endif
+}
+
+vnet_api_error_t
+bfd_auth_del_key (u32 conf_key_id)
+{
+#if WITH_LIBSSL > 0
+ bfd_auth_key_t *auth_key = NULL;
+ bfd_main_t *bm = bfd_udp_main.bfd_main;
+ uword *key_idx_p = hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
+ if (key_idx_p)
+ {
+ /* deleting existing key - must not be used */
+ const uword key_idx = *key_idx_p;
+ auth_key = pool_elt_at_index (bm->auth_keys, key_idx);
+ if (auth_key->use_count > 0)
+ {
+ clib_warning ("Authentication key with conf ID %u in use by %u BFD "
+ "sessions - cannot delete",
+ conf_key_id, auth_key->use_count);
+ return VNET_API_ERROR_BFD_EINUSE;
+ }
+ hash_unset (bm->auth_key_by_conf_key_id, conf_key_id);
+ memset (auth_key, 0, sizeof (*auth_key));
+ pool_put (bm->auth_keys, auth_key);
+ }
+ else
+ {
+ /* no such key */
+ clib_warning ("Authentication key with conf ID %u does not exist",
+ conf_key_id);
+ return VNET_API_ERROR_BFD_ENOENT;
+ }
+ return 0;
+#else
+ clib_warning ("SSL missing, cannot manipulate authentication keys");
+ return VNET_API_ERROR_BFD_NOTSUPP;
+#endif
+}
+
+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)
+{
+#if WITH_LIBSSL > 0
+ 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)
+ {
+ return rv;
+ }
+ return bfd_auth_activate (bs, conf_key_id, key_id, is_delayed);
+#else
+ clib_warning ("SSL missing, cannot activate BFD authentication");
+ return VNET_API_ERROR_BFD_NOTSUPP;
+#endif
+}
+
+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_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)
+ {
+ return rv;
+ }
+ return bfd_auth_deactivate (bs, is_delayed);
}
typedef enum
BFD_UDP_INPUT_N_NEXT,
} bfd_udp_input_next_t;
-/* Packet counters */
+/* Packet counters - BFD control frames */
#define foreach_bfd_udp_error(F) \
F (NONE, "good bfd packets (processed)") \
- F (BAD, "invalid bfd packets") \
- F (DISABLED, "bfd packets received on disabled interfaces")
+ F (BAD, "invalid bfd packets")
#define F(sym, string) static char BFD_UDP_ERR_##sym##_STR[] = string;
foreach_bfd_udp_error (F);
BFD_UDP_N_ERROR,
} bfd_udp_error_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, const ip4_header_t ** ip4,
- const udp_header_t ** udp)
+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)->ip.start_of_ip_header;
expected_ttl);
return BFD_UDP_ERROR_BAD;
}
- if (clib_net_to_host_u16 (udp->src_port) < 49152 ||
- clib_net_to_host_u16 (udp->src_port) > 65535)
+ 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);
b->current_length, sizeof (*pkt));
return BFD_UDP_ERROR_BAD;
}
- const ip4_header_t *ip4;
- const udp_header_t *udp;
+ 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;
return BFD_UDP_ERROR_BAD;
}
BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
- if (!bfd_verify_pkt_session (pkt, b->current_length, bs))
+ if (!bfd_verify_pkt_auth (pkt, b->current_length, bs))
{
+ BFD_ERR ("Packet verification failed, dropping packet");
return BFD_UDP_ERROR_BAD;
}
bfd_udp_error_t err;
}
static void
-bfd_udp6_find_headers (vlib_buffer_t * b, const ip6_header_t ** ip6,
- const udp_header_t ** udp)
+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)->ip.start_of_ip_header;
*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);
}
ip6->hop_limit, expected_hop_limit);
return BFD_UDP_ERROR_BAD;
}
- if (clib_net_to_host_u16 (udp->src_port) < 49152 ||
- clib_net_to_host_u16 (udp->src_port) > 65535)
+ 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);
b->current_length, sizeof (*pkt));
return BFD_UDP_ERROR_BAD;
}
- const ip6_header_t *ip6;
- const udp_header_t *udp;
+ 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;
return BFD_UDP_ERROR_BAD;
}
BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
- if (!bfd_verify_pkt_session (pkt, b->current_length, bs))
+ if (!bfd_verify_pkt_auth (pkt, b->current_length, bs))
{
+ BFD_ERR ("Packet verification failed, dropping packet");
return BFD_UDP_ERROR_BAD;
}
bfd_udp_error_t err;
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 */
+ /*
+ * 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))
{
- bfd_send_final (vm, b0, bs);
+ bfd_init_final_control_frame (vm, b0, bfd_udp_main.bfd_main,
+ bs);
if (is_ipv6)
{
vlib_node_increment_counter (vm, bfd_udp6_input_node.index,
};
/* *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;
+
+ 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 (t0->data, vlib_buffer_get_current (b0), len);
+ }
+
+ if (bfd_consume_echo_pkt (bfd_udp_main.bfd_main, b0))
+ {
+ b0->error = rt->errors[BFD_UDP_ERROR_NONE];
+ next0 = BFD_UDP_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_INPUT_NEXT_REPLY;
+ }
+
+ 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_INPUT_N_NEXT,
+ .next_nodes =
+ {
+ [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
+ [BFD_UDP_INPUT_NEXT_REPLY] = "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_INPUT_N_NEXT,
+ .next_nodes =
+ {
+ [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
+ [BFD_UDP_INPUT_NEXT_REPLY] = "ip6-lookup",
+ },
+};
+
+/* *INDENT-ON* */
+
static clib_error_t *
bfd_sw_interface_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
{
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 ();
udp_register_dst_port (vm, UDP_DST_PORT_bfd4, bfd_udp4_input_node.index, 1);
udp_register_dst_port (vm, UDP_DST_PORT_bfd6, bfd_udp6_input_node.index, 0);
+ udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo4,
+ bfd_udp_echo4_input_node.index, 1);
+ udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo6,
+ bfd_udp_echo6_input_node.index, 0);
return 0;
}
Code Review / vpp.git / blobdiff