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Diffstat (limited to 'proto/bfd/packets.c')
-rw-r--r--proto/bfd/packets.c117
1 files changed, 79 insertions, 38 deletions
diff --git a/proto/bfd/packets.c b/proto/bfd/packets.c
index e48a5aaa..8f7a1f65 100644
--- a/proto/bfd/packets.c
+++ b/proto/bfd/packets.c
@@ -1,11 +1,10 @@
+/*
+ * BIRD -- Bidirectional Forwarding Detection (BFD)
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
-
-#define BFD_FLAG_POLL (1 << 5)
-#define BFD_FLAG_FINAL (1 << 4)
-#define BFD_FLAG_CPI (1 << 3)
-#define BFD_FLAG_AP (1 << 2)
-#define BFD_FLAG_DEMAND (1 << 1)
-#define BFD_FLAG_MULTIPOINT (1 << 0)
+#include "bfd.h"
struct bfd_ctl_packet
@@ -21,12 +20,14 @@ struct bfd_ctl_packet
u32 req_min_echo_rx_int;
};
+#define BFD_BASE_LEN sizeof(struct bfd_ctl_packet)
+
-static inline void bfd_pack_vdiag(u8 version, u8 diag)
+static inline u8 bfd_pack_vdiag(u8 version, u8 diag)
{ return (version << 5) | diag; }
-static inline void bfd_pack_flags(u8 state, u8 flags)
-{ return (state << 6) | diag; }
+static inline u8 bfd_pack_flags(u8 state, u8 flags)
+{ return (state << 6) | flags; }
static inline u8 bfd_pkt_get_version(struct bfd_ctl_packet *pkt)
{ return pkt->vdiag >> 5; }
@@ -45,17 +46,17 @@ static inline void bfd_pkt_set_state(struct bfd_ctl_packet *pkt, u8 val)
void
bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final)
{
- sock *sk = p->skX;
- struct bfd_ctl_packet *pkt = (struct ospf_packet *) sk->tbuf;
+ sock *sk = s->bsock->sk;
+ struct bfd_ctl_packet *pkt = (struct bfd_ctl_packet *) sk->tbuf;
pkt->vdiag = bfd_pack_vdiag(1, s->loc_diag);
pkt->flags = bfd_pack_flags(s->loc_state, 0);
pkt->detect_mult = s->detect_mult;
- pkt->length = 24;
+ pkt->length = BFD_BASE_LEN;
pkt->snd_id = htonl(s->loc_id);
pkt->rcv_id = htonl(s->rem_id);
- pkt->des_min_tx_int = htonl(s->des_min_tx_int);
- pkt->req_min_rx_int = htonl(s->req_min_rx_int);
+ pkt->des_min_tx_int = htonl(s->des_min_tx_new);
+ pkt->req_min_rx_int = htonl(s->req_min_rx_new);
pkt->req_min_echo_rx_int = 0;
if (final)
@@ -63,15 +64,21 @@ bfd_send_ctl(struct bfd_proto *p, struct bfd_session *s, int final)
else if (s->poll_active)
pkt->flags |= BFD_FLAG_POLL;
- // XXX
- sk_send_to(sk, len, dst, 0);
+ if (sk->tbuf != sk->tpos)
+ log(L_ERR "%s: old packet was overwritten in TX buffer", p->p.name);
+
+ sk_send_to(sk, pkt->length, s->addr, sk->dport);
}
-int
-bfd_ctl_rx_hook(sock *sk, int len)
+#define DROP(DSC,VAL) do { err_dsc = DSC; err_val = VAL; goto drop; } while(0)
+
+static int
+bfd_rx_hook(sock *sk, int len)
{
- struct bfd_proto *p = sk->data;
- struct bfd_ctl_packet *pkt =sk->rbuf;
+ struct bfd_proto *p = sk->data;
+ struct bfd_ctl_packet *pkt = (struct bfd_ctl_packet *) sk->rbuf;
+ const char *err_dsc = NULL;
+ uint err_val = 0;
if (len < BFD_BASE_LEN)
DROP("too short", len);
@@ -108,11 +115,11 @@ bfd_ctl_rx_hook(sock *sk, int len)
if (ps > BFD_STATE_DOWN)
DROP("invalid init state", ps);
- s = bfd_find_session_by_ip(p, sk->faddr);
+ s = bfd_find_session_by_addr(p, sk->faddr);
/* FIXME: better session matching and message */
if (!s || !s->opened)
- return;
+ return 1;
}
/* FIXME: better authentication handling and message */
@@ -120,17 +127,18 @@ bfd_ctl_rx_hook(sock *sk, int len)
DROP("authentication not supported", 0);
- u32 old_rx_int = s->des_min_tx_int;
- u32 old_tx_int = s->rem_min_rx_int;
+ u32 old_tx_int = s->des_min_tx_int;
+ u32 old_rx_int = s->rem_min_rx_int;
s->rem_id = ntohl(pkt->snd_id);
s->rem_state = bfd_pkt_get_state(pkt);
+ s->rem_diag = bfd_pkt_get_diag(pkt);
s->rem_demand_mode = pkt->flags & BFD_FLAG_DEMAND;
s->rem_min_tx_int = ntohl(pkt->des_min_tx_int);
s->rem_min_rx_int = ntohl(pkt->req_min_rx_int);
s->rem_detect_mult = pkt->detect_mult;
- bfd_session_process_ctl(s, pkt->flags, xxx);
+ bfd_session_process_ctl(s, pkt->flags, old_tx_int, old_rx_int);
return 1;
drop:
@@ -138,10 +146,17 @@ bfd_ctl_rx_hook(sock *sk, int len)
return 1;
}
+static void
+bfd_err_hook(sock *sk, int err)
+{
+ struct bfd_proto *p = sk->data;
+ log(L_ERR "%s: Socket error: %m", p->p.name, err);
+}
+
sock *
bfd_open_rx_sk(struct bfd_proto *p, int multihop)
{
- sock *sk = sk_new(p->p.pool);
+ sock *sk = sk_new(p->tpool);
sk->type = SK_UDP;
sk->sport = !multihop ? BFD_CONTROL_PORT : BFD_MULTI_CTL_PORT;
sk->data = p;
@@ -149,33 +164,59 @@ bfd_open_rx_sk(struct bfd_proto *p, int multihop)
sk->rbsize = 64; // XXX
sk->rx_hook = bfd_rx_hook;
sk->err_hook = bfd_err_hook;
-
- sk->flags = SKF_LADDR_RX | (!multihop ? SKF_TTL_RX : 0);
+
+ /* TODO: configurable ToS and priority */
+ sk->tos = IP_PREC_INTERNET_CONTROL;
+ sk->priority = sk_priority_control;
+ sk->flags = SKF_THREAD | SKF_LADDR_RX | (!multihop ? SKF_TTL_RX : 0);
+
+#ifdef IPV6
+ sk->flags |= SKF_V6ONLY;
+#endif
if (sk_open(sk) < 0)
goto err;
+
+ sk_start(sk);
+ return sk;
+
+ err:
+ rfree(sk);
+ return NULL;
}
static inline sock *
bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa)
{
- sock *sk = sk_new(p->p.pool);
+ sock *sk = sk_new(p->tpool);
sk->type = SK_UDP;
sk->saddr = local;
+ sk->dport = ifa ? BFD_CONTROL_PORT : BFD_MULTI_CTL_PORT;
+ sk->iface = ifa;
sk->data = p;
sk->tbsize = 64; // XXX
sk->err_hook = bfd_err_hook;
-
- sk->iface = new;
- sk->tos = PATT->tx_tos;
- sk->priority = PATT->tx_priority;
- sk->ttl = PATT->ttl_security ? 255 : 1;
+ /* TODO: configurable ToS, priority and TTL security */
+ sk->tos = IP_PREC_INTERNET_CONTROL;
+ sk->priority = sk_priority_control;
+ sk->ttl = ifa ? 255 : -1;
+ sk->flags = SKF_THREAD;
+
+#ifdef IPV6
+ sk->flags |= SKF_V6ONLY;
+#endif
if (sk_open(sk) < 0)
goto err;
+ sk_start(sk);
+ return sk;
+
+ err:
+ rfree(sk);
+ return NULL;
}
struct bfd_socket *
@@ -183,14 +224,14 @@ bfd_get_socket(struct bfd_proto *p, ip_addr local, struct iface *ifa)
{
struct bfd_socket *sk;
- WALK_LIST(sk, p->sockets)
+ WALK_LIST(sk, p->sock_list)
if (ipa_equal(sk->sk->saddr, local) && (sk->sk->iface == ifa))
return sk->uc++, sk;
- sk = mb_allocz(p->p.pool, sizeof(struct bfd_socket));
+ sk = mb_allocz(p->tpool, sizeof(struct bfd_socket));
sk->sk = bfd_open_tx_sk(p, local, ifa);
sk->uc = 1;
- add_tail(&p->sockets, &sk->n);
+ add_tail(&p->sock_list, &sk->n);
return sk;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 22:19:27 +0000