summaryrefslogtreecommitdiffstats
path: root/src/vnet/bfd
diff options
context:
space:
mode:
Diffstat (limited to 'src/vnet/bfd')
-rw-r--r--src/vnet/bfd/bfd.api207
-rw-r--r--src/vnet/bfd/bfd_api.c177
-rw-r--r--src/vnet/bfd/bfd_api.h31
-rw-r--r--src/vnet/bfd/bfd_main.c628
-rw-r--r--src/vnet/bfd/bfd_main.h79
-rw-r--r--src/vnet/bfd/bfd_protocol.c127
-rw-r--r--src/vnet/bfd/bfd_protocol.h119
-rw-r--r--src/vnet/bfd/bfd_udp.c343
8 files changed, 1455 insertions, 256 deletions
diff --git a/src/vnet/bfd/bfd.api b/src/vnet/bfd/bfd.api
index 5798ee698ce..17ca35b6004 100644
--- a/src/vnet/bfd/bfd.api
+++ b/src/vnet/bfd/bfd.api
@@ -21,7 +21,8 @@
@param min_rx - desired min rx interval
@param detect_mult - desired detection multiplier
*/
-define bfd_set_config {
+define bfd_set_config
+{
u32 client_index;
u32 context;
u32 slow_timer;
@@ -34,14 +35,16 @@ define bfd_set_config {
@param context - sender context, to match reply w/ request
@param retval - return code for the request
*/
-define bfd_set_config_reply {
+define bfd_set_config_reply
+{
u32 context;
i32 retval;
};
/** \brief Get BFD configuration
*/
-define bfd_get_config {
+define bfd_get_config
+{
u32 client_index;
u32 context;
};
@@ -54,7 +57,8 @@ define bfd_get_config {
@param min_rx - desired min rx interval
@param detect_mult - desired detection multiplier
*/
-define bfd_get_config_reply {
+define bfd_get_config_reply
+{
u32 client_index;
u32 context;
u32 slow_timer;
@@ -69,12 +73,16 @@ define bfd_get_config_reply {
@param sw_if_index - sw index of the interface
@param desired_min_tx - desired min transmit interval (microseconds)
@param required_min_rx - required min receive interval (microseconds)
- @param detect_mult - detect multiplier (# of packets missed between connection goes down)
@param local_addr - local address
@param peer_addr - peer address
@param is_ipv6 - local_addr, peer_addr are IPv6 if non-zero, otherwise IPv4
+ @param detect_mult - detect multiplier (# of packets missed before connection goes down)
+ @param is_authenticated - non-zero if authentication is required
+ @param bfd_key_id - key id sent out in BFD packets (if is_authenticated)
+ @param conf_key_id - id of already configured key (if is_authenticated)
*/
-define bfd_udp_add {
+define bfd_udp_add
+{
u32 client_index;
u32 context;
u32 sw_if_index;
@@ -84,17 +92,19 @@ define bfd_udp_add {
u8 peer_addr[16];
u8 is_ipv6;
u8 detect_mult;
+ u8 is_authenticated;
+ u8 bfd_key_id;
+ u32 conf_key_id;
};
/** \brief Add UDP BFD session response
@param context - sender context, to match reply w/ request
@param retval - return code for the request
- @param bs_index - index of the session created
*/
-define bfd_udp_add_reply {
+define bfd_udp_add_reply
+{
u32 context;
i32 retval;
- u32 bs_index;
};
/** \brief Delete UDP BFD session on interface
@@ -105,7 +115,8 @@ define bfd_udp_add_reply {
@param peer_addr - peer address
@param is_ipv6 - local_addr, peer_addr are IPv6 if non-zero, otherwise IPv4
*/
-define bfd_udp_del {
+define bfd_udp_del
+{
u32 client_index;
u32 context;
u32 sw_if_index;
@@ -118,7 +129,8 @@ define bfd_udp_del {
@param context - sender context, to match reply w/ request
@param retval - return code for the request
*/
-define bfd_udp_del_reply {
+define bfd_udp_del_reply
+{
u32 context;
i32 retval;
};
@@ -127,48 +139,61 @@ define bfd_udp_del_reply {
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
*/
-define bfd_udp_session_dump {
+define bfd_udp_session_dump
+{
u32 client_index;
u32 context;
};
/** \brief BFD session details structure
@param context - sender context, to match reply w/ request
- @param bs_index - index of the session
@param sw_if_index - sw index of the interface
@param local_addr - local address
@param peer_addr - peer address
@param is_ipv6 - local_addr, peer_addr are IPv6 if non-zero, otherwise IPv4
@param state - session state
+ @param is_authenticated - non-zero if authentication in-use, zero otherwise
+ @param bfd_key_id - ID of key currently in-use if auth is on
+ @param conf_key_id - configured key ID for this session
*/
-define bfd_udp_session_details {
+define bfd_udp_session_details
+{
u32 context;
- u32 bs_index;
u32 sw_if_index;
u8 local_addr[16];
u8 peer_addr[16];
u8 is_ipv6;
u8 state;
+ u8 is_authenticated;
+ u8 bfd_key_id;
+ u32 conf_key_id;
};
-/** \brief Set flags of BFD session
+/** \brief Set flags of BFD UDP session
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
- @param bs_index - index of the bfd session to set flags on
+ @param sw_if_index - sw index of the interface
+ @param local_addr - local address
+ @param peer_addr - peer address
+ @param is_ipv6 - local_addr, peer_addr are IPv6 if non-zero, otherwise IPv4
@param admin_up_down - set the admin state, 1 = up, 0 = down
*/
-define bfd_session_set_flags {
+define bfd_udp_session_set_flags
+{
u32 client_index;
u32 context;
- u32 bs_index;
+ u32 sw_if_index;
+ u8 local_addr[16];
+ u8 peer_addr[16];
+ u8 is_ipv6;
u8 admin_up_down;
};
-/** \brief Reply to bfd_session_set_flags
+/** \brief Reply to bfd_udp_session_set_flags
@param context - sender context which was passed in the request
@param retval - return code of the set flags request
*/
-define bfd_session_set_flags_reply
+define bfd_udp_session_set_flags_reply
{
u32 context;
i32 retval;
@@ -198,6 +223,146 @@ define want_bfd_events_reply
i32 retval;
};
+/** \brief BFD UDP - add/replace key to configuration
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+ @param conf_key_id - key ID to add/replace/delete
+ @param key_len - length of key (must be non-zero)
+ @param auth_type - authentication type (RFC 5880/4.1/Auth Type)
+ @param key - key data
+*/
+define bfd_auth_set_key
+{
+ u32 client_index;
+ u32 context;
+ u32 conf_key_id;
+ u8 key_len;
+ u8 auth_type;
+ u8 key[20];
+};
+
+/** \brief BFD UDP - add/replace key reply
+ @param context - returned sender context, to match reply w/ request
+ @param retval - return code
+*/
+define bfd_auth_set_key_reply
+{
+ u32 context;
+ i32 retval;
+};
+
+/** \brief BFD UDP - delete key from configuration
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+ @param conf_key_id - key ID to add/replace/delete
+ @param key_len - length of key (must be non-zero)
+ @param key - key data
+*/
+define bfd_auth_del_key
+{
+ u32 client_index;
+ u32 context;
+ u32 conf_key_id;
+};
+
+/** \brief BFD UDP - delete key reply
+ @param context - returned sender context, to match reply w/ request
+ @param retval - return code
+*/
+define bfd_auth_del_key_reply
+{
+ u32 context;
+ i32 retval;
+};
+
+/** \brief Get a list of configured authentication keys
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+*/
+define bfd_auth_keys_dump
+{
+ u32 client_index;
+ u32 context;
+};
+
+/** \brief BFD authentication key details
+ @param context - sender context, to match reply w/ request
+ @param conf_key_id - configured key ID
+ @param use_count - how many BFD sessions currently use this key
+ @param auth_type - authentication type (RFC 5880/4.1/Auth Type)
+*/
+define bfd_auth_keys_details
+{
+ u32 context;
+ u32 conf_key_id;
+ u32 use_count;
+ u8 auth_type;
+};
+
+/** \brief BFD UDP - activate/change authentication
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+ @param sw_if_index - sw index of the interface
+ @param local_addr - local address
+ @param peer_addr - peer address
+ @param is_ipv6 - local_addr, peer_addr are IPv6 if non-zero, otherwise IPv4
+ @param is_delayed - change is applied once peer applies the change (on first received packet with this auth)
+ @param bfd_key_id - key id sent out in BFD packets
+ @param conf_key_id - id of already configured key
+*/
+define bfd_udp_auth_activate
+{
+ u32 client_index;
+ u32 context;
+ u32 sw_if_index;
+ u8 local_addr[16];
+ u8 peer_addr[16];
+ u8 is_ipv6;
+ u8 is_delayed;
+ u8 bfd_key_id;
+ u32 conf_key_id;
+};
+
+/** \brief BFD UDP - activate/change authentication reply
+ @param context - returned sender context, to match reply w/ request
+ @param retval - return code
+*/
+define bfd_udp_auth_activate_reply
+{
+ u32 context;
+ i32 retval;
+};
+
+/** \brief BFD UDP - deactivate authentication
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+ @param sw_if_index - sw index of the interface
+ @param local_addr - local address
+ @param peer_addr - peer address
+ @param is_ipv6 - local_addr, peer_addr are IPv6 if non-zero, otherwise IPv4
+ @param is_delayed - change is applied once peer applies the change (on first received non-authenticated packet)
+*/
+define bfd_udp_auth_deactivate
+{
+ u32 client_index;
+ u32 context;
+ u32 sw_if_index;
+ u8 local_addr[16];
+ u8 peer_addr[16];
+ u8 is_ipv6;
+ u8 is_delayed;
+};
+
+/** \brief BFD UDP - deactivate authentication reply
+ @param context - returned sender context, to match reply w/ request
+ @param retval - return code
+*/
+define bfd_udp_auth_deactivate_reply
+{
+ u32 context;
+ i32 retval;
+};
+
/*
* Local Variables:
* eval: (c-set-style "gnu")
diff --git a/src/vnet/bfd/bfd_api.c b/src/vnet/bfd/bfd_api.c
index 2e63fe90d78..cfc3a38d575 100644
--- a/src/vnet/bfd/bfd_api.c
+++ b/src/vnet/bfd/bfd_api.c
@@ -43,15 +43,39 @@
#include <vlibapi/api_helper_macros.h>
-#define foreach_vpe_api_msg \
- _ (BFD_UDP_ADD, bfd_udp_add) \
- _ (BFD_UDP_DEL, bfd_udp_del) \
- _ (BFD_UDP_SESSION_DUMP, bfd_udp_session_dump) \
- _ (BFD_SESSION_SET_FLAGS, bfd_session_set_flags) \
- _ (WANT_BFD_EVENTS, want_bfd_events)
+#define foreach_vpe_api_msg \
+ _ (BFD_UDP_ADD, bfd_udp_add) \
+ _ (BFD_UDP_DEL, bfd_udp_del) \
+ _ (BFD_UDP_SESSION_DUMP, bfd_udp_session_dump) \
+ _ (BFD_UDP_SESSION_SET_FLAGS, bfd_udp_session_set_flags) \
+ _ (WANT_BFD_EVENTS, want_bfd_events) \
+ _ (BFD_AUTH_SET_KEY, bfd_auth_set_key) \
+ _ (BFD_AUTH_DEL_KEY, bfd_auth_del_key) \
+ _ (BFD_AUTH_KEYS_DUMP, bfd_auth_keys_dump) \
+ _ (BFD_UDP_AUTH_ACTIVATE, bfd_udp_auth_activate) \
+ _ (BFD_UDP_AUTH_DEACTIVATE, bfd_udp_auth_deactivate)
pub_sub_handler (bfd_events, BFD_EVENTS);
+#define BFD_UDP_API_PARAM_COMMON_CODE \
+ ip46_address_t local_addr; \
+ memset (&local_addr, 0, sizeof (local_addr)); \
+ ip46_address_t peer_addr; \
+ memset (&peer_addr, 0, sizeof (peer_addr)); \
+ if (mp->is_ipv6) \
+ { \
+ clib_memcpy (&local_addr.ip6, mp->local_addr, sizeof (local_addr.ip6)); \
+ clib_memcpy (&peer_addr.ip6, mp->peer_addr, sizeof (peer_addr.ip6)); \
+ } \
+ else \
+ { \
+ clib_memcpy (&local_addr.ip4, mp->local_addr, sizeof (local_addr.ip4)); \
+ clib_memcpy (&peer_addr.ip4, mp->peer_addr, sizeof (peer_addr.ip4)); \
+ }
+
+#define BFD_UDP_API_PARAM_FROM_MP(mp) \
+ clib_net_to_host_u32 (mp->sw_if_index), &local_addr, &peer_addr
+
static void
vl_api_bfd_udp_add_t_handler (vl_api_bfd_udp_add_t * mp)
{
@@ -60,31 +84,17 @@ vl_api_bfd_udp_add_t_handler (vl_api_bfd_udp_add_t * mp)
VALIDATE_SW_IF_INDEX (mp);
- ip46_address_t local_addr;
- memset (&local_addr, 0, sizeof (local_addr));
- ip46_address_t peer_addr;
- memset (&peer_addr, 0, sizeof (peer_addr));
- if (mp->is_ipv6)
- {
- clib_memcpy (&local_addr.ip6, mp->local_addr, sizeof (local_addr.ip6));
- clib_memcpy (&peer_addr.ip6, mp->peer_addr, sizeof (peer_addr.ip6));
- }
- else
- {
- clib_memcpy (&local_addr.ip4, mp->local_addr, sizeof (local_addr.ip4));
- clib_memcpy (&peer_addr.ip4, mp->peer_addr, sizeof (peer_addr.ip4));
- }
+ BFD_UDP_API_PARAM_COMMON_CODE;
- u32 bs_index = 0;
- rv = bfd_udp_add_session (clib_net_to_host_u32 (mp->sw_if_index),
+ rv = bfd_udp_add_session (BFD_UDP_API_PARAM_FROM_MP (mp),
clib_net_to_host_u32 (mp->desired_min_tx),
clib_net_to_host_u32 (mp->required_min_rx),
- mp->detect_mult, &local_addr, &peer_addr,
- &bs_index);
+ mp->detect_mult, mp->is_authenticated,
+ clib_net_to_host_u32 (mp->conf_key_id),
+ mp->bfd_key_id);
BAD_SW_IF_INDEX_LABEL;
- REPLY_MACRO2 (VL_API_BFD_UDP_ADD_REPLY,
- rmp->bs_index = clib_host_to_net_u32 (bs_index));
+ REPLY_MACRO (VL_API_BFD_UDP_ADD_REPLY);
}
static void
@@ -95,23 +105,9 @@ vl_api_bfd_udp_del_t_handler (vl_api_bfd_udp_del_t * mp)
VALIDATE_SW_IF_INDEX (mp);
- ip46_address_t local_addr;
- memset (&local_addr, 0, sizeof (local_addr));
- ip46_address_t peer_addr;
- memset (&peer_addr, 0, sizeof (peer_addr));
- if (mp->is_ipv6)
- {
- clib_memcpy (&local_addr.ip6, mp->local_addr, sizeof (local_addr.ip6));
- clib_memcpy (&peer_addr.ip6, mp->peer_addr, sizeof (peer_addr.ip6));
- }
- else
- {
- clib_memcpy (&local_addr.ip4, mp->local_addr, sizeof (local_addr.ip4));
- clib_memcpy (&peer_addr.ip4, mp->peer_addr, sizeof (peer_addr.ip4));
- }
+ BFD_UDP_API_PARAM_COMMON_CODE;
- rv = bfd_udp_del_session (clib_net_to_host_u32 (mp->sw_if_index),
- &local_addr, &peer_addr);
+ rv = bfd_udp_del_session (BFD_UDP_API_PARAM_FROM_MP (mp));
BAD_SW_IF_INDEX_LABEL;
REPLY_MACRO (VL_API_BFD_UDP_DEL_REPLY);
@@ -131,7 +127,6 @@ send_bfd_udp_session_details (unix_shared_memory_queue_t * q, u32 context,
memset (mp, 0, sizeof (*mp));
mp->_vl_msg_id = ntohs (VL_API_BFD_UDP_SESSION_DETAILS);
mp->context = context;
- mp->bs_index = clib_host_to_net_u32 (bs->bs_idx);
mp->state = bs->local_state;
bfd_udp_session_t *bus = &bs->udp;
bfd_udp_key_t *key = &bus->key;
@@ -198,15 +193,101 @@ vl_api_bfd_udp_session_dump_t_handler (vl_api_bfd_udp_session_dump_t * mp)
}
static void
-vl_api_bfd_session_set_flags_t_handler (vl_api_bfd_session_set_flags_t * mp)
+vl_api_bfd_udp_session_set_flags_t_handler (vl_api_bfd_udp_session_set_flags_t
+ * mp)
{
- vl_api_bfd_session_set_flags_reply_t *rmp;
+ vl_api_bfd_udp_session_set_flags_reply_t *rmp;
int rv;
- rv = bfd_session_set_flags (clib_net_to_host_u32 (mp->bs_index),
- mp->admin_up_down);
+ BFD_UDP_API_PARAM_COMMON_CODE;
+
+ rv = bfd_udp_session_set_flags (BFD_UDP_API_PARAM_FROM_MP (mp),
+ mp->admin_up_down);
+
+ REPLY_MACRO (VL_API_BFD_UDP_SESSION_SET_FLAGS_REPLY);
+}
+
+static void
+vl_api_bfd_auth_set_key_t_handler (vl_api_bfd_auth_set_key_t * mp)
+{
+ vl_api_bfd_auth_set_key_reply_t *rmp;
+ int rv = bfd_auth_set_key (clib_net_to_host_u32 (mp->conf_key_id),
+ mp->auth_type, mp->key_len, mp->key);
+
+ REPLY_MACRO (VL_API_BFD_AUTH_SET_KEY_REPLY);
+}
+
+static void
+vl_api_bfd_auth_del_key_t_handler (vl_api_bfd_auth_del_key_t * mp)
+{
+ vl_api_bfd_auth_del_key_reply_t *rmp;
+ int rv = bfd_auth_del_key (clib_net_to_host_u32 (mp->conf_key_id));
+
+ REPLY_MACRO (VL_API_BFD_AUTH_DEL_KEY_REPLY);
+}
+
+static void
+vl_api_bfd_auth_keys_dump_t_handler (vl_api_bfd_auth_keys_dump_t * mp)
+{
+ unix_shared_memory_queue_t *q;
- REPLY_MACRO (VL_API_BFD_SESSION_SET_FLAGS_REPLY);
+ q = vl_api_client_index_to_input_queue (mp->client_index);
+
+ if (q == 0)
+ return;
+
+ bfd_auth_key_t *key = NULL;
+ vl_api_bfd_auth_keys_details_t *rmp = NULL;
+
+ /* *INDENT-OFF* */
+ pool_foreach (key, bfd_main.auth_keys, ({
+ rmp = vl_msg_api_alloc (sizeof (*rmp));
+ memset (rmp, 0, sizeof (*rmp));
+ rmp->_vl_msg_id = ntohs (VL_API_BFD_AUTH_KEYS_DETAILS);
+ rmp->context = mp->context;
+ rmp->conf_key_id = clib_host_to_net_u32 (key->conf_key_id);
+ rmp->auth_type = key->auth_type;
+ rmp->use_count = clib_host_to_net_u32 (key->use_count);
+ vl_msg_api_send_shmem (q, (u8 *)&rmp);
+ }));
+ /* *INDENT-ON* */
+}
+
+static void
+vl_api_bfd_udp_auth_activate_t_handler (vl_api_bfd_udp_auth_activate_t * mp)
+{
+ vl_api_bfd_udp_auth_activate_reply_t *rmp;
+ int rv;
+
+ VALIDATE_SW_IF_INDEX (mp);
+
+ BFD_UDP_API_PARAM_COMMON_CODE;
+
+ rv =
+ bfd_udp_auth_activate (BFD_UDP_API_PARAM_FROM_MP (mp),
+ clib_net_to_host_u32 (mp->conf_key_id),
+ mp->bfd_key_id, mp->is_delayed);
+
+ BAD_SW_IF_INDEX_LABEL;
+ REPLY_MACRO (VL_API_BFD_UDP_AUTH_ACTIVATE_REPLY);
+}
+
+static void
+vl_api_bfd_udp_auth_deactivate_t_handler (vl_api_bfd_udp_auth_deactivate_t *
+ mp)
+{
+ vl_api_bfd_udp_auth_deactivate_reply_t *rmp;
+ int rv;
+
+ VALIDATE_SW_IF_INDEX (mp);
+
+ BFD_UDP_API_PARAM_COMMON_CODE;
+
+ rv =
+ bfd_udp_auth_deactivate (BFD_UDP_API_PARAM_FROM_MP (mp), mp->is_delayed);
+
+ BAD_SW_IF_INDEX_LABEL;
+ REPLY_MACRO (VL_API_BFD_UDP_AUTH_DEACTIVATE_REPLY);
}
/*
diff --git a/src/vnet/bfd/bfd_api.h b/src/vnet/bfd/bfd_api.h
index a9bc5a1f40c..128a3dc42bf 100644
--- a/src/vnet/bfd/bfd_api.h
+++ b/src/vnet/bfd/bfd_api.h
@@ -24,17 +24,36 @@
#include <vnet/ip/ip6_packet.h>
#include <vnet/bfd/bfd_udp.h>
-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);
+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_us,
+ u32 required_min_rx_us, u8 detect_mult,
+ u8 is_authenticated, u32 conf_key_id, u8 bfd_key_id);
vnet_api_error_t bfd_udp_del_session (u32 sw_if_index,
const ip46_address_t * local_addr,
const ip46_address_t * peer_addr);
-vnet_api_error_t bfd_session_set_flags (u32 bs_index, u8 admin_up_down);
+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);
+
+vnet_api_error_t bfd_auth_set_key (u32 conf_key_id, u8 auth_type, u8 key_len,
+ const u8 * key);
+
+vnet_api_error_t bfd_auth_del_key (u32 conf_key_id);
+
+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 bfd_key_id,
+ u8 is_delayed);
+
+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);
#endif /* __included_bfd_api_h__ */
diff --git a/src/vnet/bfd/bfd_main.c b/src/vnet/bfd/bfd_main.c
index 7e1a2ef24a7..8f2fae2b795 100644
--- a/src/vnet/bfd/bfd_main.c
+++ b/src/vnet/bfd/bfd_main.c
@@ -25,6 +25,9 @@
#include <vnet/bfd/bfd_debug.h>
#include <vnet/bfd/bfd_protocol.h>
#include <vnet/bfd/bfd_main.h>
+#if WITH_LIBSSL > 0
+#include <openssl/sha.h>
+#endif
static u64
bfd_us_to_clocks (bfd_main_t * bm, u64 us)
@@ -41,6 +44,23 @@ static u32 bfd_node_index_by_transport[] = {
#undef F
};
+static u8 *
+format_bfd_auth_key (u8 * s, va_list * args)
+{
+ const bfd_auth_key_t *key = va_arg (*args, bfd_auth_key_t *);
+ if (key)
+ {
+ s = format (s, "{auth-type=%u:%s, conf-key-id=%u, use-count=%u}, ",
+ key->auth_type, bfd_auth_type_str (key->auth_type),
+ key->conf_key_id, key->use_count);
+ }
+ else
+ {
+ s = format (s, "{none}");
+ }
+ return s;
+}
+
/*
* We actually send all bfd pkts to the "error" node after scanning
* them, so the graph node has only one next-index. The "error-drop"
@@ -67,6 +87,9 @@ bfd_set_defaults (bfd_main_t * bm, bfd_session_t * bs)
bs->desired_min_tx_clocks = bfd_us_to_clocks (bm, bs->desired_min_tx_us);
bs->remote_min_rx_us = 1;
bs->remote_demand = 0;
+ bs->auth.remote_seq_number = 0;
+ bs->auth.remote_seq_number_known = 0;
+ bs->auth.local_seq_number = random_u32 (&bm->random_seed);
}
static void
@@ -288,7 +311,7 @@ bfd_del_session (uword bs_idx)
else
{
BFD_ERR ("no such session");
- return VNET_API_ERROR_BFD_NOENT;
+ return VNET_API_ERROR_BFD_ENOENT;
}
return 0;
}
@@ -319,16 +342,10 @@ bfd_state_string (bfd_state_e state)
#undef F
}
-vnet_api_error_t
-bfd_session_set_flags (u32 bs_idx, u8 admin_up_down)
+void
+bfd_session_set_flags (bfd_session_t * bs, u8 admin_up_down)
{
bfd_main_t *bm = &bfd_main;
- if (pool_is_free_index (bm->sessions, bs_idx))
- {
- BFD_ERR ("invalid bs_idx=%u", bs_idx);
- return VNET_API_ERROR_BFD_NOENT;
- }
- bfd_session_t *bs = pool_elt_at_index (bm->sessions, bs_idx);
if (admin_up_down)
{
bfd_set_state (bm, bs, BFD_STATE_down, 0);
@@ -338,7 +355,6 @@ bfd_session_set_flags (u32 bs_idx, u8 admin_up_down)
bfd_set_diag (bs, BFD_DIAG_CODE_neighbor_sig_down);
bfd_set_state (bm, bs, BFD_STATE_admin_down, 0);
}
- return 0;
}
u8 *
@@ -351,8 +367,8 @@ bfd_input_format_trace (u8 * s, va_list * args)
if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head))
{
s = format (s, "BFD v%u, diag=%u(%s), state=%u(%s),\n"
- " flags=(P:%u, F:%u, C:%u, A:%u, D:%u, M:%u), detect_mult=%u, "
- "length=%u\n",
+ " flags=(P:%u, F:%u, C:%u, A:%u, D:%u, M:%u), "
+ "detect_mult=%u, length=%u\n",
bfd_pkt_get_version (pkt), bfd_pkt_get_diag_code (pkt),
bfd_diag_code_string (bfd_pkt_get_diag_code (pkt)),
bfd_pkt_get_state (pkt),
@@ -362,8 +378,8 @@ bfd_input_format_trace (u8 * s, va_list * args)
bfd_pkt_get_auth_present (pkt), bfd_pkt_get_demand (pkt),
bfd_pkt_get_multipoint (pkt), pkt->head.detect_mult,
pkt->head.length);
- if (t->len >= sizeof (bfd_pkt_t)
- && pkt->head.length >= sizeof (bfd_pkt_t))
+ if (t->len >= sizeof (bfd_pkt_t) &&
+ pkt->head.length >= sizeof (bfd_pkt_t))
{
s = format (s, " my discriminator: %u\n", pkt->my_disc);
s = format (s, " your discriminator: %u\n", pkt->your_disc);
@@ -430,8 +446,7 @@ bfd_add_transport_layer (vlib_main_t * vm, vlib_buffer_t * b,
}
static vlib_buffer_t *
-bfd_create_frame (vlib_main_t * vm, vlib_node_runtime_t * rt,
- bfd_session_t * bs)
+bfd_create_frame_to_next_node (vlib_main_t * vm, bfd_session_t * bs)
{
u32 bi;
if (vlib_buffer_alloc (vm, &bi, 1) != 1)
@@ -454,13 +469,82 @@ bfd_create_frame (vlib_main_t * vm, vlib_node_runtime_t * rt,
return b;
}
+#if WITH_LIBSSL > 0
+static void
+bfd_add_sha1_auth_section (vlib_buffer_t * b, bfd_session_t * bs)
+{
+ bfd_pkt_with_sha1_auth_t *pkt = vlib_buffer_get_current (b);
+ bfd_auth_sha1_t *auth = &pkt->sha1_auth;
+ b->current_length += sizeof (*auth);
+ pkt->pkt.head.length += sizeof (*auth);
+ bfd_pkt_set_auth_present (&pkt->pkt);
+ memset (auth, 0, sizeof (*auth));
+ auth->type_len.type = bs->auth.curr_key->auth_type;
+ /*
+ * only meticulous authentication types require incrementing seq number
+ * for every message, but doing so doesn't violate the RFC
+ */
+ ++bs->auth.local_seq_number;
+ auth->type_len.len = sizeof (bfd_auth_sha1_t);
+ auth->key_id = bs->auth.curr_bfd_key_id;
+ auth->seq_num = clib_host_to_net_u32 (bs->auth.local_seq_number);
+ /*
+ * first copy the password into the packet, then calculate the hash
+ * and finally replace the password with the calculated hash
+ */
+ clib_memcpy (auth->hash, bs->auth.curr_key->key,
+ sizeof (bs->auth.curr_key->key));
+ unsigned char hash[sizeof (auth->hash)];
+ SHA1 ((unsigned char *) pkt, sizeof (*pkt), hash);
+ BFD_DBG ("hashing: %U", format_hex_bytes, pkt, sizeof (*pkt));
+ clib_memcpy (auth->hash, hash, sizeof (hash));
+#endif
+}
+
+static void
+bfd_add_auth_section (vlib_buffer_t * b, bfd_session_t * bs)
+{
+ if (bs->auth.curr_key)
+ {
+ const bfd_auth_type_e auth_type = bs->auth.curr_key->auth_type;
+ switch (auth_type)
+ {
+ case BFD_AUTH_TYPE_reserved:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_simple_password:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_keyed_md5:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_md5:
+ clib_warning ("Internal error, unexpected BFD auth type '%d'",
+ auth_type);
+ break;
+#if WITH_LIBSSL > 0
+ case BFD_AUTH_TYPE_keyed_sha1:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_sha1:
+ bfd_add_sha1_auth_section (b, bs);
+ break;
+#else
+ case BFD_AUTH_TYPE_keyed_sha1:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_sha1:
+ clib_warning ("Internal error, unexpected BFD auth type '%d'",
+ auth_type);
+ break;
+#endif
+ }
+ }
+}
+
static void
bfd_init_control_frame (vlib_buffer_t * b, bfd_session_t * bs)
{
bfd_pkt_t *pkt = vlib_buffer_get_current (b);
- const u32 bfd_length = 24;
- memset (pkt, 0, sizeof (*pkt));
+ u32 bfd_length = 0;
+ bfd_length = sizeof (bfd_pkt_t);
+ memset (pkt, 0, sizeof (*pkt));
bfd_pkt_set_version (pkt, 1);
bfd_pkt_set_diag_code (pkt, bs->local_diag);
bfd_pkt_set_state (pkt, bs->local_state);
@@ -477,6 +561,7 @@ bfd_init_control_frame (vlib_buffer_t * b, bfd_session_t * bs)
pkt->req_min_rx = clib_host_to_net_u32 (bs->required_min_rx_us);
pkt->req_min_echo_rx = clib_host_to_net_u32 (bs->required_min_echo_rx_us);
b->current_length = bfd_length;
+ bfd_add_auth_section (b, bs);
}
static void
@@ -502,7 +587,7 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt,
if (now + bm->wheel_inaccuracy >= bs->tx_timeout_clocks)
{
BFD_DBG ("Send periodic control frame for bs_idx=%lu", bs->bs_idx);
- vlib_buffer_t *b = bfd_create_frame (vm, rt, bs);
+ vlib_buffer_t *b = bfd_create_frame_to_next_node (vm, bs);
if (!b)
{
return;
@@ -522,7 +607,8 @@ bfd_send_periodic (vlib_main_t * vm, vlib_node_runtime_t * rt,
}
void
-bfd_send_final (vlib_main_t * vm, vlib_buffer_t * b, bfd_session_t * bs)
+bfd_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b,
+ bfd_session_t * bs)
{
BFD_DBG ("Send final control frame for bs_idx=%lu", bs->bs_idx);
bfd_init_control_frame (b, bs);
@@ -624,13 +710,17 @@ bfd_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
* each event or timeout */
break;
case BFD_EVENT_NEW_SESSION:
- do
+ if (!pool_is_free_index (bm->sessions, *event_data))
{
bfd_session_t *bs =
pool_elt_at_index (bm->sessions, *event_data);
bfd_send_periodic (vm, rt, bm, bs, now, 1);
}
- while (0);
+ else
+ {
+ BFD_DBG ("Ignoring event for non-existent session index %u",
+ (u32) * event_data);
+ }
break;
default:
clib_warning ("BUG: event type 0x%wx", event_type);
@@ -710,22 +800,25 @@ VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down);
static clib_error_t *
bfd_main_init (vlib_main_t * vm)
{
+#if BFD_DEBUG
+ setbuf (stdout, NULL);
+#endif
bfd_main_t *bm = &bfd_main;
bm->random_seed = random_default_seed ();
bm->vlib_main = vm;
bm->vnet_main = vnet_get_main ();
memset (&bm->wheel, 0, sizeof (bm->wheel));
- bm->cpu_cps = 2590000000; // vm->clib_time.clocks_per_second;
+ bm->cpu_cps = vm->clib_time.clocks_per_second;
BFD_DBG ("cps is %.2f", bm->cpu_cps);
const u64 now = clib_cpu_time_now ();
timing_wheel_init (&bm->wheel, now, bm->cpu_cps);
bm->wheel_inaccuracy = 2 << bm->wheel.log2_clocks_per_bin;
vlib_node_t *node = NULL;
-#define F(t, n) \
- node = vlib_get_node_by_name (vm, (u8 *)n); \
- bfd_node_index_by_transport[BFD_TRANSPORT_##t] = node->index;\
- BFD_DBG("node '%s' has index %u", n, node->index);
+#define F(t, n) \
+ node = vlib_get_node_by_name (vm, (u8 *)n); \
+ bfd_node_index_by_transport[BFD_TRANSPORT_##t] = node->index; \
+ BFD_DBG ("node '%s' has index %u", n, node->index);
foreach_bfd_transport (F);
#undef F
return 0;
@@ -750,6 +843,14 @@ bfd_get_session (bfd_main_t * bm, bfd_transport_t t)
void
bfd_put_session (bfd_main_t * bm, bfd_session_t * bs)
{
+ if (bs->auth.curr_key)
+ {
+ --bs->auth.curr_key->use_count;
+ }
+ if (bs->auth.next_key)
+ {
+ --bs->auth.next_key->use_count;
+ }
hash_unset (bm->session_by_disc, bs->local_discr);
pool_put (bm->sessions, bs);
}
@@ -793,7 +894,7 @@ bfd_verify_pkt_common (const bfd_pkt_t * pkt)
}
if (pkt->head.length < sizeof (bfd_pkt_t) ||
(bfd_pkt_get_auth_present (pkt) &&
- pkt->head.length < sizeof (bfd_pkt_with_auth_t)))
+ pkt->head.length < sizeof (bfd_pkt_with_common_auth_t)))
{
BFD_ERR ("BFD verification failed - unexpected length: '%d' (auth "
"present: %d)",
@@ -831,6 +932,226 @@ bfd_verify_pkt_common (const bfd_pkt_t * pkt)
return 1;
}
+static void
+bfd_session_switch_auth_to_next (bfd_session_t * bs)
+{
+ BFD_DBG ("Switching authentication key from %U to %U for bs_idx=%u",
+ format_bfd_auth_key, bs->auth.curr_key, format_bfd_auth_key,
+ bs->auth.next_key, bs->bs_idx);
+ bs->auth.is_delayed = 0;
+ if (bs->auth.curr_key)
+ {
+ --bs->auth.curr_key->use_count;
+ }
+ bs->auth.curr_key = bs->auth.next_key;
+ bs->auth.next_key = NULL;
+ bs->auth.curr_bfd_key_id = bs->auth.next_bfd_key_id;
+}
+
+static int
+bfd_auth_type_is_meticulous (bfd_auth_type_e auth_type)
+{
+ if (BFD_AUTH_TYPE_meticulous_keyed_md5 == auth_type ||
+ BFD_AUTH_TYPE_meticulous_keyed_sha1 == auth_type)
+ {
+ return 1;
+ }
+ return 0;
+}
+
+static int
+bfd_verify_pkt_auth_seq_num (bfd_session_t * bs,
+ u32 received_seq_num, int is_meticulous)
+{
+ /*
+ * RFC 5880 6.8.1:
+ *
+ * This variable MUST be set to zero after no packets have been
+ * received on this session for at least twice the Detection Time.
+ */
+ u64 now = clib_cpu_time_now ();
+ if (now - bs->last_rx_clocks > bs->detection_time_clocks * 2)
+ {
+ BFD_DBG ("BFD peer unresponsive for %lu clocks, which is > 2 * "
+ "detection_time=%u clocks, resetting remote_seq_number_known "
+ "flag",
+ now - bs->last_rx_clocks, bs->detection_time_clocks * 2);
+ bs->auth.remote_seq_number_known = 0;
+ }
+ if (bs->auth.remote_seq_number_known)
+ {
+ /* remote sequence number is known, verify its validity */
+ const u32 max_u32 = 0xffffffff;
+ /* the calculation might wrap, account for the special case... */
+ if (bs->auth.remote_seq_number > max_u32 - 3 * bs->local_detect_mult)
+ {
+ /*
+ * special case
+ *
+ * x y z
+ * |----------+----------------------------+-----------|
+ * 0 ^ ^ 0xffffffff
+ * | remote_seq_num------+
+ * |
+ * +-----(remote_seq_num + 3*detect_mult) % * 0xffffffff
+ *
+ * x + y + z = 0xffffffff
+ * x + z = 3 * detect_mult
+ */
+ const u32 z = max_u32 - bs->auth.remote_seq_number;
+ const u32 x = 3 * bs->local_detect_mult - z;
+ if (received_seq_num > x &&
+ received_seq_num < bs->auth.remote_seq_number + is_meticulous)
+ {
+ BFD_ERR
+ ("Recvd sequence number=%u out of ranges <0, %u>, <%u, %u>",
+ received_seq_num, x,
+ bs->auth.remote_seq_number + is_meticulous, max_u32);
+ return 0;
+ }
+ }
+ else
+ {
+ /* regular case */
+ const u32 min = bs->auth.remote_seq_number + is_meticulous;
+ const u32 max =
+ bs->auth.remote_seq_number + 3 * bs->local_detect_mult;
+ if (received_seq_num < min || received_seq_num > max)
+ {
+ BFD_ERR ("Recvd sequence number=%u out of range <%u, %u>",
+ received_seq_num, min, max);
+ return 0;
+ }
+ }
+ }
+ return 1;
+}
+
+static int
+bfd_verify_pkt_auth_key_sha1 (const bfd_pkt_t * pkt, u32 pkt_size,
+ bfd_session_t * bs, u8 bfd_key_id,
+ bfd_auth_key_t * auth_key)
+{
+ ASSERT (auth_key->auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
+ auth_key->auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1);
+
+ u8 result[SHA_DIGEST_LENGTH];
+ bfd_pkt_with_common_auth_t *with_common = (void *) pkt;
+ if (pkt_size < sizeof (*with_common))
+ {
+ BFD_ERR ("Packet size too small to hold authentication common header");
+ return 0;
+ }
+ if (with_common->common_auth.type != auth_key->auth_type)
+ {
+ BFD_ERR ("BFD auth type mismatch, packet auth=%d:%s doesn't match "
+ "in-use auth=%d:%s",
+ with_common->common_auth.type,
+ bfd_auth_type_str (with_common->common_auth.type),
+ auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
+ return 0;
+ }
+ bfd_pkt_with_sha1_auth_t *with_sha1 = (void *) pkt;
+ if (pkt_size < sizeof (*with_sha1) ||
+ with_sha1->sha1_auth.type_len.len < sizeof (with_sha1->sha1_auth))
+ {
+ BFD_ERR
+ ("BFD size mismatch, payload size=%u, expected=%u, auth_len=%u, "
+ "expected=%u", pkt_size, sizeof (*with_sha1),
+ with_sha1->sha1_auth.type_len.len, sizeof (with_sha1->sha1_auth));
+ return 0;
+ }
+ if (with_sha1->sha1_auth.key_id != bfd_key_id)
+ {
+ BFD_ERR
+ ("BFD key ID mismatch, packet key ID=%u doesn't match key ID=%u%s",
+ with_sha1->sha1_auth.key_id, bfd_key_id,
+ bs->
+ auth.is_delayed ? " (but a delayed auth change is scheduled)" : "");
+ return 0;
+ }
+ SHA_CTX ctx;
+ if (!SHA1_Init (&ctx))
+ {
+ BFD_ERR ("SHA1_Init failed");
+ return 0;
+ }
+ /* ignore last 20 bytes - use the actual key data instead pkt data */
+ if (!SHA1_Update (&ctx, with_sha1,
+ sizeof (*with_sha1) - sizeof (with_sha1->sha1_auth.hash)))
+ {
+ BFD_ERR ("SHA1_Update failed");
+ return 0;
+ }
+ if (!SHA1_Update (&ctx, auth_key->key, sizeof (auth_key->key)))
+ {
+ BFD_ERR ("SHA1_Update failed");
+ return 0;
+ }
+ if (!SHA1_Final (result, &ctx))
+ {
+ BFD_ERR ("SHA1_Final failed");
+ return 0;
+ }
+ if (0 == memcmp (result, with_sha1->sha1_auth.hash, SHA_DIGEST_LENGTH))
+ {
+ return 1;
+ }
+ BFD_ERR ("SHA1 hash: %U doesn't match the expected value: %U",
+ format_hex_bytes, with_sha1->sha1_auth.hash, SHA_DIGEST_LENGTH,
+ format_hex_bytes, result, SHA_DIGEST_LENGTH);
+ return 0;
+}
+
+static int
+bfd_verify_pkt_auth_key (const bfd_pkt_t * pkt, u32 pkt_size,
+ bfd_session_t * bs, u8 bfd_key_id,
+ bfd_auth_key_t * auth_key)
+{
+ switch (auth_key->auth_type)
+ {
+ case BFD_AUTH_TYPE_reserved:
+ clib_warning ("Internal error, unexpected auth_type=%d:%s",
+ auth_key->auth_type,
+ bfd_auth_type_str (auth_key->auth_type));
+ return 0;
+ case BFD_AUTH_TYPE_simple_password:
+ clib_warning
+ ("Internal error, not implemented, unexpected auth_type=%d:%s",
+ auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
+ return 0;
+ case BFD_AUTH_TYPE_keyed_md5:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_md5:
+ clib_warning
+ ("Internal error, not implemented, unexpected auth_type=%d:%s",
+ auth_key->auth_type, bfd_auth_type_str (auth_key->auth_type));
+ return 0;
+ case BFD_AUTH_TYPE_keyed_sha1:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_sha1:
+#if WITH_LIBSSL > 0
+ do
+ {
+ const u32 seq_num = clib_net_to_host_u32 (((bfd_pkt_with_sha1_auth_t
+ *) pkt)->
+ sha1_auth.seq_num);
+ return bfd_verify_pkt_auth_seq_num (bs, seq_num,
+ bfd_auth_type_is_meticulous
+ (auth_key->auth_type))
+ && bfd_verify_pkt_auth_key_sha1 (pkt, pkt_size, bs, bfd_key_id,
+ auth_key);
+ }
+ while (0);
+#else
+ clib_warning
+ ("Internal error, attempt to use SHA1 without SSL support");
+ return 0;
+#endif
+ }
+ return 0;
+}
+
/**
* @brief verify bfd packet - authentication
*
@@ -839,30 +1160,81 @@ bfd_verify_pkt_common (const bfd_pkt_t * pkt)
* @return 1 if bfd packet is valid
*/
int
-bfd_verify_pkt_session (const bfd_pkt_t * pkt, u16 pkt_size,
- const bfd_session_t * bs)
+bfd_verify_pkt_auth (const bfd_pkt_t * pkt, u16 pkt_size, bfd_session_t * bs)
{
- const bfd_pkt_with_auth_t *with_auth = (bfd_pkt_with_auth_t *) pkt;
- if (!bfd_pkt_get_auth_present (pkt))
+ if (bfd_pkt_get_auth_present (pkt))
{
- if (pkt_size > sizeof (*pkt))
+ /* authentication present in packet */
+ if (!bs->auth.curr_key)
{
- BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
- "(auth not present)", pkt_size);
- return 0;
+ /* currently not using authentication - can we turn it on? */
+ if (bs->auth.is_delayed && bs->auth.next_key)
+ {
+ /* yes, switch is scheduled - make sure the auth is valid */
+ if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
+ bs->auth.next_bfd_key_id,
+ bs->auth.next_key))
+ {
+ /* auth matches next key, do the switch, packet is valid */
+ bfd_session_switch_auth_to_next (bs);
+ return 1;
+ }
+ }
+ }
+ else
+ {
+ /* yes, using authentication, verify the key */
+ if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
+ bs->auth.curr_bfd_key_id,
+ bs->auth.curr_key))
+ {
+ /* verification passed, packet is valid */
+ return 1;
+ }
+ else
+ {
+ /* verification failed - but maybe we need to switch key */
+ if (bs->auth.is_delayed && bs->auth.next_key)
+ {
+ /* delayed switch present, verify if that key works */
+ if (bfd_verify_pkt_auth_key (pkt, pkt_size, bs,
+ bs->auth.next_bfd_key_id,
+ bs->auth.next_key))
+ {
+ /* auth matches next key, switch key, packet is valid */
+ bfd_session_switch_auth_to_next (bs);
+ return 1;
+ }
+ }
+ }
}
}
else
{
- if (!with_auth->auth.type)
+ /* authentication in packet not present */
+ if (pkt_size > sizeof (*pkt))
{
- BFD_ERR ("BFD verification failed - unexpected auth type: '%d'",
- with_auth->auth.type);
+ BFD_ERR ("BFD verification failed - unexpected packet size '%d' "
+ "(auth not present)", pkt_size);
return 0;
}
- /* TODO FIXME - implement the actual verification */
+ if (bs->auth.curr_key)
+ {
+ /* currently authenticating - could we turn it off? */
+ if (bs->auth.is_delayed && !bs->auth.next_key)
+ {
+ /* yes, delayed switch to NULL key is scheduled */
+ bfd_session_switch_auth_to_next (bs);
+ return 1;
+ }
+ }
+ else
+ {
+ /* no auth in packet, no auth in use - packet is valid */
+ return 1;
+ }
}
- return 1;
+ return 0;
}
void
@@ -879,6 +1251,38 @@ bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * pkt, u32 bs_idx)
bs->remote_demand = bfd_pkt_get_demand (pkt);
u64 now = clib_cpu_time_now ();
bs->last_rx_clocks = now;
+ if (bfd_pkt_get_auth_present (pkt))
+ {
+ bfd_auth_type_e auth_type =
+ ((bfd_pkt_with_common_auth_t *) (pkt))->common_auth.type;
+ switch (auth_type)
+ {
+ case BFD_AUTH_TYPE_reserved:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_simple_password:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_keyed_md5:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_md5:
+ clib_warning ("Internal error, unexpected auth_type=%d:%s",
+ auth_type, bfd_auth_type_str (auth_type));
+ break;
+ case BFD_AUTH_TYPE_keyed_sha1:
+ /* fallthrough */
+ case BFD_AUTH_TYPE_meticulous_keyed_sha1:
+ do
+ {
+ bfd_pkt_with_sha1_auth_t *with_sha1 =
+ (bfd_pkt_with_sha1_auth_t *) pkt;
+ bs->auth.remote_seq_number =
+ clib_net_to_host_u32 (with_sha1->sha1_auth.seq_num);
+ bs->auth.remote_seq_number_known = 1;
+ BFD_DBG ("Received sequence number %u",
+ bs->auth.remote_seq_number);
+ }
+ while (0);
+ }
+ }
bs->remote_desired_min_tx_us = clib_net_to_host_u32 (pkt->des_min_tx);
bs->remote_detect_mult = pkt->head.detect_mult;
bfd_set_remote_required_min_rx (bm, bs, now,
@@ -933,25 +1337,129 @@ u8 *
format_bfd_session (u8 * s, va_list * args)
{
const bfd_session_t *bs = va_arg (*args, bfd_session_t *);
- return format (s, "BFD(%u): bfd.SessionState=%s, "
- "bfd.RemoteSessionState=%s, "
- "bfd.LocalDiscr=%u, "
- "bfd.RemoteDiscr=%u, "
- "bfd.LocalDiag=%s, "
- "bfd.DesiredMinTxInterval=%u, "
- "bfd.RequiredMinRxInterval=%u, "
- "bfd.RequiredMinEchoRxInterval=%u, "
- "bfd.RemoteMinRxInterval=%u, "
- "bfd.DemandMode=%s, "
- "bfd.RemoteDemandMode=%s, "
- "bfd.DetectMult=%u, ",
- bs->bs_idx, bfd_state_string (bs->local_state),
- bfd_state_string (bs->remote_state), bs->local_discr,
- bs->remote_discr, bfd_diag_code_string (bs->local_diag),
- bs->desired_min_tx_us, bs->required_min_rx_us,
- bs->required_min_echo_rx_us, bs->remote_min_rx_us,
- (bs->local_demand ? "yes" : "no"),
- (bs->remote_demand ? "yes" : "no"), bs->local_detect_mult);
+ s = format (s, "BFD(%u): bfd.SessionState=%s, "
+ "bfd.RemoteSessionState=%s, "
+ "bfd.LocalDiscr=%u, "
+ "bfd.RemoteDiscr=%u, "
+ "bfd.LocalDiag=%s, "
+ "bfd.DesiredMinTxInterval=%u, "
+ "bfd.RequiredMinRxInterval=%u, "
+ "bfd.RequiredMinEchoRxInterval=%u, "
+ "bfd.RemoteMinRxInterval=%u, "
+ "bfd.DemandMode=%s, "
+ "bfd.RemoteDemandMode=%s, "
+ "bfd.DetectMult=%u, "
+ "Auth: {local-seq-num=%u, "
+ "remote-seq-num=%u, "
+ "is-delayed=%s, "
+ "curr-key=%U, "
+ "next-key=%U}",
+ bs->bs_idx, bfd_state_string (bs->local_state),
+ bfd_state_string (bs->remote_state), bs->local_discr,
+ bs->remote_discr, bfd_diag_code_string (bs->local_diag),
+ bs->desired_min_tx_us, bs->required_min_rx_us,
+ bs->required_min_echo_rx_us, bs->remote_min_rx_us,
+ (bs->local_demand ? "yes" : "no"),
+ (bs->remote_demand ? "yes" : "no"), bs->local_detect_mult,
+ bs->auth.local_seq_number, bs->auth.remote_seq_number,
+ (bs->auth.is_delayed ? "yes" : "no"), format_bfd_auth_key,
+ bs->auth.curr_key, format_bfd_auth_key, bs->auth.next_key);
+ return s;
+}
+
+unsigned
+bfd_auth_type_supported (bfd_auth_type_e auth_type)
+{
+ if (auth_type == BFD_AUTH_TYPE_keyed_sha1 ||
+ auth_type == BFD_AUTH_TYPE_meticulous_keyed_sha1)
+ {
+ return 1;
+ }
+ return 0;
+}
+
+vnet_api_error_t
+bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id,
+ u8 bfd_key_id, u8 is_delayed)
+{
+ bfd_main_t *bm = &bfd_main;
+ const uword *key_idx_p =
+ hash_get (bm->auth_key_by_conf_key_id, conf_key_id);
+ if (!key_idx_p)
+ {
+ clib_warning ("Authentication key with config ID %u doesn't exist)",
+ conf_key_id);
+ return VNET_API_ERROR_BFD_ENOENT;
+ }
+ const uword key_idx = *key_idx_p;
+ bfd_auth_key_t *key = pool_elt_at_index (bm->auth_keys, key_idx);
+ if (is_delayed)
+ {
+ if (bs->auth.next_key == key)
+ {
+ /* already using this key, no changes required */
+ return 0;
+ }
+ bs->auth.next_key = key;
+ bs->auth.next_bfd_key_id = bfd_key_id;
+ bs->auth.is_delayed = 1;
+ }
+ else
+ {
+ if (bs->auth.curr_key == key)
+ {
+ /* already using this key, no changes required */
+ return 0;
+ }
+ if (bs->auth.curr_key)
+ {
+ --bs->auth.curr_key->use_count;
+ }
+ bs->auth.curr_key = key;
+ bs->auth.curr_bfd_key_id = bfd_key_id;
+ bs->auth.is_delayed = 0;
+ }
+ ++key->use_count;
+ BFD_DBG ("Session auth modified: %U", format_bfd_session, bs);
+ return 0;
+}
+
+vnet_api_error_t
+bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed)
+{
+#if WITH_LIBSSL > 0
+ if (!is_delayed)
+ {
+ /* not delayed - deactivate the current key right now */
+ if (bs->auth.curr_key)
+ {
+ --bs->auth.curr_key->use_count;
+ bs->auth.curr_key = NULL;
+ }
+ bs->auth.is_delayed = 0;
+ }
+ else
+ {
+ /* delayed - mark as so */
+ bs->auth.is_delayed = 1;
+ }
+ /*
+ * clear the next key unconditionally - either the auth change is not delayed
+ * in which case the caller expects the session to not use authentication
+ * from this point forward, or it is delayed, in which case the next_key
+ * needs to be set to NULL to make it so in the future
+ */
+ if (bs->auth.next_key)
+ {
+ --bs->auth.next_key->use_count;
+ bs->auth.next_key = NULL;
+ }
+ BFD_DBG ("Session auth modified: %U", format_bfd_session, bs);
+ return 0;
+#else
+ clib_warning ("SSL missing, cannot deactivate BFD authentication");
+ return VNET_API_ERROR_BFD_NOTSUPP;
+#endif
}
bfd_main_t bfd_main;
diff --git a/src/vnet/bfd/bfd_main.h b/src/vnet/bfd/bfd_main.h
index 20da381ac23..b66b79e71a0 100644
--- a/src/vnet/bfd/bfd_main.h
+++ b/src/vnet/bfd/bfd_main.h
@@ -25,7 +25,7 @@
#include <vnet/bfd/bfd_udp.h>
#define foreach_bfd_transport(F) \
- F (UDP4, "ip4-rewrite") \
+ F (UDP4, "ip4-rewrite") \
F (UDP6, "ip6-rewrite")
typedef enum
@@ -48,6 +48,24 @@ typedef enum
typedef struct
{
+ /* global configuration key ID */
+ u32 conf_key_id;
+
+ /* keeps track of how many sessions reference this key */
+ u32 use_count;
+
+ /*
+ * key data directly usable for bfd purposes - already padded with zeroes
+ * (so we don't need the actual length)
+ */
+ u8 key[20];
+
+ /* authentication type for this key */
+ bfd_auth_type_e auth_type;
+} bfd_auth_key_t;
+
+typedef struct
+{
/* index in bfd_main.sessions pool */
u32 bs_idx;
@@ -120,6 +138,40 @@ typedef struct
/* detection time */
u64 detection_time_clocks;
+ /* authentication information */
+ struct
+ {
+ /* current key in use */
+ bfd_auth_key_t *curr_key;
+
+ /*
+ * set to next key to use if delayed switch is enabled - in that case
+ * the key is switched when first incoming packet is signed with next_key
+ */
+ bfd_auth_key_t *next_key;
+
+ /* sequence number incremented occasionally or always (if meticulous) */
+ u32 local_seq_number;
+
+ /* remote sequence number */
+ u32 remote_seq_number;
+
+ /* set to 1 if remote sequence number is known */
+ u8 remote_seq_number_known;
+
+ /* current key ID sent out in bfd packet */
+ u8 curr_bfd_key_id;
+
+ /* key ID to use when switched to next_key */
+ u8 next_bfd_key_id;
+
+ /*
+ * set to 1 if delayed action is pending, which might be activation
+ * of authentication, change of key or deactivation
+ */
+ u8 is_delayed;
+ } auth;
+
/* transport type for this session */
bfd_transport_t transport;
@@ -131,12 +183,6 @@ typedef struct
typedef struct
{
- u32 client_index;
- u32 client_pid;
-} event_subscriber_t;
-
-typedef struct
-{
/* pool of bfd sessions context data */
bfd_session_t *sessions;
@@ -162,6 +208,12 @@ typedef struct
/* for generating random numbers */
u32 random_seed;
+ /* pool of authentication keys */
+ bfd_auth_key_t *auth_keys;
+
+ /* hashmap - index in pool auth_keys by conf_key_id */
+ u32 *auth_key_by_conf_key_id;
+
} bfd_main_t;
extern bfd_main_t bfd_main;
@@ -202,12 +254,17 @@ bfd_session_t *bfd_find_session_by_disc (bfd_main_t * bm, u32 disc);
void bfd_session_start (bfd_main_t * bm, bfd_session_t * bs);
void bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * bfd, u32 bs_idx);
int bfd_verify_pkt_common (const bfd_pkt_t * pkt);
-int bfd_verify_pkt_session (const bfd_pkt_t * pkt, u16 pkt_size,
- const bfd_session_t * bs);
+int bfd_verify_pkt_auth (const bfd_pkt_t * pkt, u16 pkt_size,
+ bfd_session_t * bs);
void bfd_event (bfd_main_t * bm, bfd_session_t * bs);
-void bfd_send_final (vlib_main_t * vm, vlib_buffer_t * b, bfd_session_t * bs);
+void bfd_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b,
+ bfd_session_t * bs);
u8 *format_bfd_session (u8 * s, va_list * args);
-
+void bfd_session_set_flags (bfd_session_t * bs, u8 admin_up_down);
+unsigned bfd_auth_type_supported (bfd_auth_type_e auth_type);
+vnet_api_error_t bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id,
+ u8 bfd_key_id, u8 is_delayed);
+vnet_api_error_t bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed);
#define USEC_PER_MS 1000LL
#define USEC_PER_SECOND (1000 * USEC_PER_MS)
diff --git a/src/vnet/bfd/bfd_protocol.c b/src/vnet/bfd/bfd_protocol.c
index ede9536f3cf..180fc6df8fd 100644
--- a/src/vnet/bfd/bfd_protocol.c
+++ b/src/vnet/bfd/bfd_protocol.c
@@ -1,74 +1,159 @@
+/*
+ * 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 <vnet/bfd/bfd_protocol.h>
-u8 bfd_pkt_get_version (const bfd_pkt_t *pkt)
+u8
+bfd_pkt_get_version (const bfd_pkt_t * pkt)
{
return pkt->head.vers_diag >> 5;
}
-void bfd_pkt_set_version (bfd_pkt_t *pkt, int version)
+void
+bfd_pkt_set_version (bfd_pkt_t * pkt, int version)
{
pkt->head.vers_diag =
- (version << 5) | (pkt->head.vers_diag & ((1 << 5) - 1));
+ (version << 5) | (pkt->head.vers_diag & ((1 << 5) - 1));
}
-u8 bfd_pkt_get_diag_code (const bfd_pkt_t *pkt)
+u8
+bfd_pkt_get_diag_code (const bfd_pkt_t * pkt)
{
return pkt->head.vers_diag & ((1 << 5) - 1);
}
-void bfd_pkt_set_diag_code (bfd_pkt_t *pkt, int value)
+void
+bfd_pkt_set_diag_code (bfd_pkt_t * pkt, int value)
{
pkt->head.vers_diag =
- (pkt->head.vers_diag & ~((1 << 5) - 1)) | (value & ((1 << 5) - 1));
+ (pkt->head.vers_diag & ~((1 << 5) - 1)) | (value & ((1 << 5) - 1));
}
-u8 bfd_pkt_get_state (const bfd_pkt_t *pkt)
+u8
+bfd_pkt_get_state (const bfd_pkt_t * pkt)
{
return pkt->head.sta_flags >> 6;
}
-void bfd_pkt_set_state (bfd_pkt_t *pkt, int value)
+void
+bfd_pkt_set_state (bfd_pkt_t * pkt, int value)
{
pkt->head.sta_flags = (value << 6) | (pkt->head.sta_flags & ((1 << 6) - 1));
}
-u8 bfd_pkt_get_poll (const bfd_pkt_t *pkt)
+u8
+bfd_pkt_get_poll (const bfd_pkt_t * pkt)
{
return (pkt->head.sta_flags >> 5) & 1;
}
-void bfd_pkt_set_final (bfd_pkt_t *pkt) { pkt->head.sta_flags |= 1 << 5; }
+void
+bfd_pkt_set_poll (bfd_pkt_t * pkt)
+{
+ pkt->head.sta_flags |= 1 << 5;
+}
-u8 bfd_pkt_get_final (const bfd_pkt_t *pkt)
+u8
+bfd_pkt_get_final (const bfd_pkt_t * pkt)
{
return (pkt->head.sta_flags >> 4) & 1;
}
-void bfd_pkt_set_poll (bfd_pkt_t *pkt);
-u8 bfd_pkt_get_control_plane_independent (const bfd_pkt_t *pkt)
+void
+bfd_pkt_set_final (bfd_pkt_t * pkt)
+{
+ pkt->head.sta_flags |= 1 << 4;
+}
+
+u8
+bfd_pkt_get_control_plane_independent (const bfd_pkt_t * pkt)
{
return (pkt->head.sta_flags >> 3) & 1;
}
-void bfd_pkt_set_control_plane_independent (bfd_pkt_t *pkt);
+void
+bfd_pkt_set_control_plane_independent (bfd_pkt_t * pkt)
+{
+ pkt->head.sta_flags |= 1 << 3;
+}
-u8 bfd_pkt_get_auth_present (const bfd_pkt_t *pkt)
+u8
+bfd_pkt_get_auth_present (const bfd_pkt_t * pkt)
{
return (pkt->head.sta_flags >> 2) & 1;
}
-void bfd_pkt_set_auth_present (bfd_pkt_t *pkt);
+void
+bfd_pkt_set_auth_present (bfd_pkt_t * pkt)
+{
+ pkt->head.sta_flags |= 1 << 2;
+}
-u8 bfd_pkt_get_demand (const bfd_pkt_t *pkt)
+u8
+bfd_pkt_get_demand (const bfd_pkt_t * pkt)
{
return (pkt->head.sta_flags >> 1) & 1;
}
-void bfd_pkt_set_demand (bfd_pkt_t *pkt) { pkt->head.sta_flags |= 1 << 1; }
+void
+bfd_pkt_set_demand (bfd_pkt_t * pkt)
+{
+ pkt->head.sta_flags |= 1 << 1;
+}
+
+u8
+bfd_pkt_get_multipoint (const bfd_pkt_t * pkt)
+{
+ return (pkt->head.sta_flags >> 0) & 1;
+}
+
+void
+bfd_pkt_set_multipoint (bfd_pkt_t * pkt)
+{
+ pkt->head.sta_flags |= 1 << 0;
+}
+
+u32
+bfd_max_len_for_auth_type (bfd_auth_type_e auth_type)
+{
+#define F(t, l, n, s) \
+ if (auth_type == t) \
+ { \
+ return l; \
+ }
+ foreach_bfd_auth_type (F);
+#undef F
+ return 0;
+}
-u8 bfd_pkt_get_multipoint (const bfd_pkt_t *pkt)
+const char *
+bfd_auth_type_str (bfd_auth_type_e auth_type)
{
- return pkt->head.sta_flags & 1;
+#define F(t, l, n, s) \
+ if (auth_type == t) \
+ { \
+ return s; \
+ }
+ foreach_bfd_auth_type (F);
+#undef F
+ return "UNKNOWN";
}
-void bfd_pkt_set_multipoint (bfd_pkt_t *pkt);
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/bfd/bfd_protocol.h b/src/vnet/bfd/bfd_protocol.h
index cf751b3b89a..cdbb8fa7bd3 100644
--- a/src/vnet/bfd/bfd_protocol.h
+++ b/src/vnet/bfd/bfd_protocol.h
@@ -22,45 +22,93 @@
#include <vppinfra/types.h>
#include <vppinfra/clib.h>
+/* auth type value, max key length, name, description */
+#define foreach_bfd_auth_type(F) \
+ F (0, 0, reserved, "Reserved") \
+ F (1, 16, simple_password, "Simple Password") \
+ F (2, 16, keyed_md5, "Keyed MD5") \
+ F (3, 16, meticulous_keyed_md5, "Meticulous Keyed MD5") \
+ F (4, 20, keyed_sha1, "Keyed SHA1") \
+ F (5, 20, meticulous_keyed_sha1, "Meticulous Keyed SHA1")
+
+#define BFD_AUTH_TYPE_NAME(t) BFD_AUTH_TYPE_##t
+
+typedef enum
+{
+#define F(n, l, t, s) BFD_AUTH_TYPE_NAME (t) = n,
+ foreach_bfd_auth_type (F)
+#undef F
+} bfd_auth_type_e;
+
+u32 bfd_max_len_for_auth_type (bfd_auth_type_e auth_type);
+const char *bfd_auth_type_str (bfd_auth_type_e auth_type);
+
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
- /*
- An optional Authentication Section MAY be present:
-
- 0 1 2 3
- 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Auth Type | Auth Len | Authentication Data... |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- */
u8 type;
u8 len;
- u8 data[0];
-}) bfd_auth_t;
+}) bfd_auth_common_t;
/* *INDENT-ON* */
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
/*
- The Mandatory Section of a BFD Control packet has the following
- format:
-
- 0 1 2 3
- 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- |Vers | Diag |Sta|P|F|C|A|D|M| Detect Mult | Length |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | My Discriminator |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Your Discriminator |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Desired Min TX Interval |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Required Min RX Interval |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Required Min Echo RX Interval |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- */
+ * 4.4. Keyed SHA1 and Meticulous Keyed SHA1 Authentication Section Format
+
+ * If the Authentication Present (A) bit is set in the header, and the
+ * Authentication Type field contains 4 (Keyed SHA1) or 5 (Meticulous
+ * Keyed SHA1), the Authentication Section has the following format:
+
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Auth Type | Auth Len | Auth Key ID | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Sequence Number |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Auth Key/Hash... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | ... |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+ bfd_auth_common_t type_len;
+ u8 key_id;
+ u8 reserved;
+ u32 seq_num;
+ /*
+ * Auth Key/Hash
+
+ * This field carries the 20-byte SHA1 hash for the packet. When the
+ * hash is calculated, the shared SHA1 key is stored in this field,
+ * padded to a length of 20 bytes with trailing zero bytes if needed.
+ * The shared key MUST be encoded and configured to section 6.7.4.
+ */
+ u8 hash[20];
+}) bfd_auth_sha1_t;
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED (struct {
+ /*
+ * The Mandatory Section of a BFD Control packet has the following
+ * format:
+
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |Vers | Diag |Sta|P|F|C|A|D|M| Detect Mult | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | My Discriminator |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Your Discriminator |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Desired Min TX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Required Min RX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Required Min Echo RX Interval |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
struct
{
u8 vers_diag;
@@ -79,8 +127,15 @@ typedef CLIB_PACKED (struct {
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
bfd_pkt_t pkt;
- bfd_auth_t auth;
-}) bfd_pkt_with_auth_t;
+ bfd_auth_common_t common_auth;
+}) bfd_pkt_with_common_auth_t;
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED (struct {
+ bfd_pkt_t pkt;
+ bfd_auth_sha1_t sha1_auth;
+}) bfd_pkt_with_sha1_auth_t;
/* *INDENT-ON* */
u8 bfd_pkt_get_version (const bfd_pkt_t * pkt);
diff --git a/src/vnet/bfd/bfd_udp.c b/src/vnet/bfd/bfd_udp.c
index dfd030aeccb..443f4253b96 100644
--- a/src/vnet/bfd/bfd_udp.c
+++ b/src/vnet/bfd/bfd_udp.c
@@ -45,7 +45,7 @@ bfd_add_udp4_transport (vlib_main_t * vm, vlib_buffer_t * b,
ip4_header_t ip4;
udp_header_t udp;
} ip4_udp_headers;
- ip4_udp_headers *headers = vlib_buffer_get_current (b);
+ ip4_udp_headers *headers = NULL;
vlib_buffer_advance (b, -sizeof (*headers));
headers = vlib_buffer_get_current (b);
memset (headers, 0, sizeof (*headers));
@@ -82,8 +82,9 @@ bfd_add_udp6_transport (vlib_main_t * vm, vlib_buffer_t * b,
ip6_header_t ip6;
udp_header_t udp;
} ip6_udp_headers;
- vlib_buffer_advance (b, -sizeof (ip6_udp_headers));
- ip6_udp_headers *headers = vlib_buffer_get_current (b);
+ 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);
@@ -125,16 +126,27 @@ bfd_lookup_session (bfd_udp_main_t * bum, const bfd_udp_key_t * key)
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,
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;
if (!ip46_address_is_ip4 (local_addr))
@@ -145,19 +157,15 @@ bfd_udp_add_session_internal (bfd_udp_main_t * bum, u32 sw_if_index,
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,
@@ -185,8 +193,7 @@ bfd_udp_add_session_internal (bfd_udp_main_t * bum, u32 sw_if_index,
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;
+ *bs_out = bs;
return 0;
}
@@ -201,14 +208,14 @@ bfd_udp_validate_api_input (u32 sw_if_index,
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;
@@ -231,7 +238,7 @@ bfd_udp_validate_api_input (u32 sw_if_index,
{
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;
@@ -241,7 +248,7 @@ bfd_udp_validate_api_input (u32 sw_if_index,
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])
+ local_addr->ip6.as_u64[1] == x->as_u64[1])
{
/* valid address for this interface */
local_ip_valid = 1;
@@ -253,18 +260,48 @@ bfd_udp_validate_api_input (u32 sw_if_index,
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_us,
+ u32 required_min_rx_us, 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);
@@ -274,18 +311,66 @@ bfd_udp_add_session (u32 sw_if_index, u32 desired_min_tx_us,
}
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)
{
- BFD_ERR ("desired_min_tx_us < 1");
+ clib_warning ("desired_min_tx_us < 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_us,
+ u32 required_min_rx_us, 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_us,
+ required_min_rx_us,
+ 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_us, required_min_rx_us,
+ 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
@@ -293,36 +378,162 @@ 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;
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_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_find_session_by_api_input (sw_if_index, local_addr, peer_addr,
+ &bs);
+ if (rv)
+ {
+ return rv;
+ }
+ 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))
+ {
+ 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
+ {
+ /* 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)
{
- 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);
+ /* 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
{
- BFD_ERR ("no such session");
- return VNET_API_ERROR_BFD_NOENT;
+ /* 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
@@ -461,6 +672,14 @@ bfd_udp4_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
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;
@@ -491,8 +710,9 @@ bfd_udp4_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
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;
@@ -526,11 +746,10 @@ bfd_udp6_find_headers (vlib_buffer_t * b, const ip6_header_t ** ip6,
*udp = NULL;
return;
}
- /* FIXME skip extra headers when searching for UDP ? */
if ((*ip6)->protocol != IP_PROTOCOL_UDP)
{
BFD_ERR ("Unexpected protocol in IPv6 header '%u', expected '%u' (== "
- "IP_PROTOCOL_UDP)" (*ip6)->protocol, IP_PROTOCOL_UDP);
+ "IP_PROTOCOL_UDP)", (*ip6)->protocol, IP_PROTOCOL_UDP);
*ip6 = NULL;
*udp = NULL;
return;
@@ -596,6 +815,14 @@ bfd_udp6_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
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;
@@ -617,8 +844,9 @@ bfd_udp6_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
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);
+ "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)
@@ -627,8 +855,9 @@ bfd_udp6_scan (vlib_main_t * vm, vlib_node_runtime_t * rt,
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;
@@ -699,7 +928,7 @@ bfd_udp_input (vlib_main_t * vm, vlib_node_runtime_t * rt,
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, bs);
if (is_ipv6)
{
vlib_node_increment_counter (vm, bfd_udp6_input_node.index,