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BMP: protocol state ingestion refactoring

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This commit is contained in:
Maria Matejka 2024-12-05 12:12:34 +01:00
parent 2128c648e0
commit d5f01efbe6
1 changed files with 45 additions and 44 deletions
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89
proto/bmp/bmp.c
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@ -647,18 +647,24 @@ static struct bmp_stream *
bmp_find_stream(struct bmp_proto *p, const struct bgp_proto *bgp, u32 afi, bool policy)
{
ea_list *bgp_attr = proto_get_state(bgp->p.id);
struct bmp_stream *s = HASH_FIND(p->stream_map, HASH_STREAM, bgp_attr, bmp_stream_key(afi, policy));
while (s == NULL)
while (1)
{
/* Is there a stream? */
struct bmp_stream *s = HASH_FIND(p->stream_map, HASH_STREAM, bgp_attr, bmp_stream_key(afi, policy));
if (s)
return s;
/* Maybe it emerged recently? */
struct lfjour_item *li = lfjour_get(&p->proto_state_reader);
if (!li)
return NULL;
bmp_process_proto_state_change(p, li);
s = HASH_FIND(p->stream_map, HASH_STREAM, bgp_attr, bmp_stream_key(afi, policy));
lfjour_release(&p->proto_state_reader, li);
/* Try again. */
}
return s;
}
static struct bmp_stream *
@ -767,17 +773,17 @@ bmp_remove_peer(struct bmp_proto *p, struct bmp_peer *bp)
mb_free(bp);
}
static void
bmp_peer_up_(struct bmp_proto *p, ea_list *bgp_attr, bool sync,
static struct bmp_peer *
bmp_peer_up_(struct bmp_proto *p, ea_list *bgp_attr,
const adata *tx_open_msg, const adata *rx_open_msg,
struct bgp_conn_sk_ad *sk)
{
if (!p->started)
return;
return NULL;
struct bmp_peer *bp = bmp_find_peer(p, bgp_attr);
if (bp)
return;
return bp;
const char *name = ea_get_adata(bgp_attr, &ea_name)->data;
TRACE(D_STATES, "Peer up for %s", name);
@ -785,25 +791,11 @@ bmp_peer_up_(struct bmp_proto *p, ea_list *bgp_attr, bool sync,
bp = bmp_add_peer(p, bgp_attr);
bmp_send_peer_up_notif_msg(p, bgp_attr, tx_open_msg, rx_open_msg, sk);
/*
* We asssume peer_up() notifications are received before any route
* notifications from that peer. Therefore, peers established after BMP
* session coould be considered synced with empty RIB.
*/
if (sync)
{
struct bmp_stream *bs;
WALK_LIST(bs, bp->streams)
{
bmp_route_monitor_end_of_rib(p, bs);
bs->sync = true;
}
}
return bp;
}
static bool
bmp_peer_up_inout(struct bmp_proto *p, ea_list *bgp_attr, bool sync)
static struct bmp_peer *
bmp_peer_up_inout(struct bmp_proto *p, ea_list *bgp_attr)
{
int in_state = ea_get_int(bgp_attr, &ea_bgp_in_conn_state, 0);
int out_state = ea_get_int(bgp_attr, &ea_bgp_out_conn_state, 0);
@ -817,9 +809,7 @@ bmp_peer_up_inout(struct bmp_proto *p, ea_list *bgp_attr, bool sync)
SKIP_BACK_DECLARE(struct bgp_conn_sk_ad, sk, ad, ea_get_adata(bgp_attr, &ea_bgp_in_conn_sk));
ASSERT_DIE(loc_open && rem_open);
bmp_peer_up_(p, bgp_attr, sync, loc_open, rem_open, sk);
return true;
return bmp_peer_up_(p, bgp_attr, loc_open, rem_open, sk);
}
if (out_state == BS_ESTABLISHED)
@ -829,12 +819,10 @@ bmp_peer_up_inout(struct bmp_proto *p, ea_list *bgp_attr, bool sync)
SKIP_BACK_DECLARE(struct bgp_conn_sk_ad, sk, ad, ea_get_adata(bgp_attr, &ea_bgp_out_conn_sk));
ASSERT_DIE(loc_open && rem_open);
bmp_peer_up_(p, bgp_attr, sync, loc_open, rem_open, sk);
return true;
return bmp_peer_up_(p, bgp_attr, loc_open, rem_open, sk);
}
return false;
return NULL;
}
static bool
@ -1191,7 +1179,7 @@ bmp_startup(struct bmp_proto *p)
if (proto != &proto_bgp || state != PS_UP)
continue;
bmp_peer_up_inout(p, proto_attr, false);
bmp_peer_up_inout(p, proto_attr);
}
}
@ -1381,18 +1369,28 @@ bmp_process_proto_state_change(struct bmp_proto *p, struct lfjour_item *last_up)
if (!ppu)
return;
if (bmp_peer_up_inout(p, ppu->new, true))
goto done;
SKIP_BACK_DECLARE(struct bgp_session_close_ad, bscad, ad, ea_get_adata(ppu->new, &ea_bgp_close_bmp));
if (bscad)
struct bmp_peer *bp = bmp_peer_up_inout(p, ppu->new);
if (bp)
{
bmp_peer_down_(p, ppu->new, bscad);
goto done;
/*
* All the peer up notifications are required to arrive before any route
* notifications from that peer. Therefore, peers established after BMP
* session are considered synced with empty RIB.
*/
struct bmp_stream *bs;
WALK_LIST(bs, bp->streams)
{
bmp_route_monitor_end_of_rib(p, bs);
bs->sync = true;
}
return;
}
done:
lfjour_release(&p->proto_state_reader, last_up);
/* This was not a peer-up notification. It may be peer down tho. */
const adata *bscad = ea_get_adata(ppu->new, &ea_bgp_close_bmp);
if (bscad)
bmp_peer_down_(p, ppu->new, SKIP_BACK(struct bgp_session_close_ad, ad, bscad));
}
static void
@ -1402,8 +1400,11 @@ bmp_proto_state_changed(void *_p)
ASSERT_DIE(birdloop_inside(p->p.loop));
struct lfjour_item *last_up;
while (last_up = lfjour_get(&p->proto_state_reader))
for (
struct lfjour_item *last_up;
last_up = lfjour_get(&p->proto_state_reader);
lfjour_release(&p->proto_state_reader, last_up)
)
bmp_process_proto_state_change(p, last_up);
}