+/*
+ * 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)
{
+ const bfd_udp_session_t *bus = &bs->udp;
const bfd_udp_key_t *key = &bus->key;
b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
headers->ip4.ip_version_and_header_length = 0x45;
headers->ip4.ttl = 255;
headers->ip4.protocol = IP_PROTOCOL_UDP;
- 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.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4);
+ 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);
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)
{
+ const bfd_udp_session_t *bus = &bs->udp;
const bfd_udp_key_t *key = &bus->key;
b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
clib_host_to_net_u32 (0x6 << 28);
headers->ip6.hop_limit = 255;
headers->ip6.protocol = IP_PROTOCOL_UDP;
- 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.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));
- headers->udp.src_port = clib_host_to_net_u16 (50000); /* FIXME */
- headers->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 =
{
headers->udp.checksum = 0xffff;
}
+ return 1;
}
static bfd_session_t *
bfd_session_t ** bs_out)
{
/* 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;
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
{
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_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;
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)
{
}
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;
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)
{
const bfd_pkt_t *pkt = vlib_buffer_get_current (b0);
if (bfd_pkt_get_poll (pkt))
{
- bfd_init_final_control_frame (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