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BMP: overflow checker

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If the TX buffers overflow 1 GB, the BMP protocol restarts
because it is very much possible that the other side is stalled.
This commit is contained in:
Maria Matejka 2024-09-19 15:04:40 +02:00
parent ecfad161f7
commit 3cbb1fab71
2 changed files with 53 additions and 0 deletions
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51
proto/bmp/bmp.c
View File

@ -311,6 +311,12 @@ static struct resclass bmp_tx_buffer_class = {
.memsize = btb_memsize,
};
static bool
bmp_check_tx_overflow(u64 cnt)
{
return cnt * bmp_tx_buffer_class.size > (1ULL << 30);
}
static void
bmp_schedule_tx_packet(struct bmp_proto *p, const byte *payload, const size_t size)
{
@ -325,6 +331,9 @@ bmp_schedule_tx_packet(struct bmp_proto *p, const byte *payload, const size_t si
if (!btb)
{
if (bmp_check_tx_overflow(++p->tx_pending_count))
ev_schedule(p->tx_overflow_event);
btb = ralloc(p->tx_mem_pool, &bmp_tx_buffer_class);
btb->end = btb->buf;
btb->n = (node) {};
@ -377,6 +386,7 @@ bmp_fire_tx(void *p_)
p->sk->tbuf = NULL;
p->tx_pending = NULL;
--p->tx_pending_count;
rfree(&btb->r);
if (cnt++ > 32)
@ -397,6 +407,7 @@ bmp_tx(struct birdsock *sk)
rfree(&p->tx_pending->r);
p->tx_pending = NULL;
--p->tx_pending_count;
sk->tbuf = NULL;
bmp_fire_tx(sk->data);
@ -1200,6 +1211,26 @@ bmp_sock_err(sock *sk, int err)
proto_notify_state(&p->p, PS_START);
}
static void
bmp_tx_overflow(void *_p)
{
struct bmp_proto *p = _p;
if (!bmp_check_tx_overflow(p->tx_pending_count))
return;
p->sock_err = 0;
log(L_ERR "%s: Connection stalled", p->p.name);
if (p->started)
bmp_down(p);
bmp_close_socket(p);
tm_start(p->connect_retry_timer, CONNECT_RETRY_TIME);
proto_notify_state(&p->p, PS_START);
}
/* BMP connect timeout event - switch from Idle/Connect state to Connect state */
static void
bmp_connection_retry(timer *t)
@ -1216,6 +1247,24 @@ bmp_connection_retry(timer *t)
static void
bmp_close_socket(struct bmp_proto *p)
{
if (p->tx_pending)
{
--p->tx_pending_count;
rfree(&p->tx_pending->r);
p->tx_pending = NULL;
}
struct bmp_tx_buffer *btb;
WALK_LIST_FIRST2(btb, n, p->tx_queue)
{
--p->tx_pending_count;
rem_node(&btb->n);
rfree(&btb->r);
}
ASSERT_DIE(p->tx_pending_count == 0);
rfree(p->sk);
p->sk = NULL;
}
@ -1274,6 +1323,8 @@ bmp_start(struct proto *P)
p->tx_mem_pool = rp_new(P->pool, "BMP Tx");
p->tx_ev = ev_new_init(p->p.pool, bmp_fire_tx, p);
p->tx_pending = NULL;
p->tx_pending_count = 0;
p->tx_overflow_event = ev_new_init(p->p.pool, bmp_tx_overflow, p);
p->connect_retry_timer = tm_new_init(p->p.pool, bmp_connection_retry, p, 0, 0);
p->sk = NULL;

2
proto/bmp/bmp.h
View File

@ -68,6 +68,8 @@ struct bmp_proto {
pool *tx_mem_pool; // Memory pool used for packet allocations designated to BMP collector
list tx_queue; // Stores queued packets going to be sent
struct bmp_tx_buffer *tx_pending;// This buffer waits for socket to flush
uint tx_pending_count; // How many buffers waiting for flush
event *tx_overflow_event; // Too many buffers waiting for flush
timer *connect_retry_timer; // Timer for retrying connection to the BMP collector
bool started; // Flag that stores running status of BMP instance
int sock_err; // Last socket error code