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Better reporting of both local and remote errors.

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This commit is contained in:
Martin Mares
2000-04-25 21:13:25 +00:00
parent a47a01083b
commit efcece2da3
4 changed files with 109 additions and 52 deletions
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131
proto/bgp/packets.c
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@@ -21,17 +21,11 @@
static byte *
bgp_create_notification(struct bgp_conn *conn, byte *buf)
{
DBG("BGP: Sending notification: code=%d, sub=%d, arg=%d:%d\n", conn->notify_code, conn->notify_subcode, conn->notify_arg, conn->notify_arg_size);
DBG("BGP: Sending notification: code=%d, sub=%d\n", conn->notify_code, conn->notify_subcode);
buf[0] = conn->notify_code;
buf[1] = conn->notify_subcode;
switch (conn->notify_arg_size)
{
case 0: return buf + 1;
case 1: buf[2] = conn->notify_arg; return buf+3;
case 2: put_u16(buf+2, conn->notify_arg); return buf+4;
case 4: put_u32(buf+2, conn->notify_arg); return buf+6;
default: bug("bgp_create_notification: unknown error code size");
}
memcpy(buf+2, conn->notify_data, conn->notify_size);
return buf + 2 + conn->notify_size;
}
static byte *
@@ -205,7 +199,7 @@ bgp_parse_options(struct bgp_conn *conn, byte *opt, int len)
while (len > 0)
{
if (len < 2 || len < 2 + opt[1])
{ bgp_error(conn, 2, 0, 0, 0); return 0; }
{ bgp_error(conn, 2, 0, NULL, 0); return 0; }
#ifdef LOCAL_DEBUG
{
int i;
@@ -228,7 +222,7 @@ bgp_parse_options(struct bgp_conn *conn, byte *opt, int len)
* to do so. Also, capability negotiation with
* Cisco routers doesn't work without that.
*/
bgp_error(conn, 2, 4, opt[0], 1);
bgp_error(conn, 2, 4, opt, opt[1]);
return 0;
}
len -= 2 + opt[1];
@@ -248,26 +242,26 @@ bgp_rx_open(struct bgp_conn *conn, byte *pkt, int len)
/* Check state */
if (conn->state != BS_OPENSENT)
{ bgp_error(conn, 5, 0, conn->state, 0); }
{ bgp_error(conn, 5, 0, NULL, 0); }
/* Check message contents */
if (len < 29 || len != 29 + pkt[28])
{ bgp_error(conn, 1, 2, len, 2); return; }
{ bgp_error(conn, 1, 2, pkt+16, 2); return; }
if (pkt[19] != BGP_VERSION)
{ bgp_error(conn, 2, 1, pkt[19], 1); return; } /* RFC 1771 says 16 bits, draft-09 tells to use 8 */
{ bgp_error(conn, 2, 1, pkt+19, 1); return; } /* RFC 1771 says 16 bits, draft-09 tells to use 8 */
as = get_u16(pkt+20);
hold = get_u16(pkt+22);
id = get_u32(pkt+24);
DBG("BGP: OPEN as=%d hold=%d id=%08x\n", as, hold, id);
if (cf->remote_as && as != p->remote_as)
{ bgp_error(conn, 2, 2, as, 0); return; }
{ bgp_error(conn, 2, 2, pkt+20, -2); return; }
if (hold > 0 && hold < 3)
{ bgp_error(conn, 2, 6, hold, 0); return; }
{ bgp_error(conn, 2, 6, pkt+22, 2); return; }
p->remote_id = id;
if (bgp_parse_options(conn, pkt+29, pkt[28]))
return;
if (!id || id == 0xffffffff || id == p->local_id)
{ bgp_error(conn, 2, 3, id, 0); return; }
{ bgp_error(conn, 2, 3, pkt+24, -4); return; }
/* Check the other connection */
other = (conn == &p->outgoing_conn) ? &p->incoming_conn : &p->outgoing_conn;
@@ -286,14 +280,14 @@ bgp_rx_open(struct bgp_conn *conn, byte *pkt, int len)
{
/* Should close the other connection */
DBG("BGP: Collision, closing the other connection\n");
bgp_error(other, 6, 0, 0, 0);
bgp_error(other, 6, 0, NULL, 0);
break;
}
/* Fall thru */
case BS_ESTABLISHED:
/* Should close this connection */
DBG("BGP: Collision, closing this connection\n");
bgp_error(conn, 6, 0, 0, 0);
bgp_error(conn, 6, 0, NULL, 0);
return;
default:
bug("bgp_rx_open: Unknown state");
@@ -322,7 +316,7 @@ bgp_rx_open(struct bgp_conn *conn, byte *pkt, int len)
int b = *pp++; \
int q; \
ll--; \
if (b > BITS_PER_IP_ADDRESS) { bgp_error(conn, 3, 10, b, 0); return; } \
if (b > BITS_PER_IP_ADDRESS) { bgp_error(conn, 3, 10, NULL, 0); return; } \
q = (b+7) / 8; \
if (ll < q) goto malformed; \
memcpy(&prefix, pp, q); \
@@ -348,13 +342,13 @@ bgp_rx_update(struct bgp_conn *conn, byte *pkt, int len)
DBG("BGP: UPDATE\n");
if (conn->state != BS_ESTABLISHED)
{ bgp_error(conn, 5, 0, conn->state, 0); return; }
{ bgp_error(conn, 5, 0, NULL, 0); return; }
bgp_start_timer(conn->hold_timer, conn->hold_time);
/* Find parts of the packet and check sizes */
if (len < 23)
{
bgp_error(conn, 1, 2, len, 2);
bgp_error(conn, 1, 2, pkt+16, 2);
return;
}
withdrawn = pkt + 21;
@@ -403,7 +397,69 @@ bgp_rx_update(struct bgp_conn *conn, byte *pkt, int len)
malformed:
if (a)
rta_free(a);
bgp_error(conn, 3, 1, len, 0);
bgp_error(conn, 3, 1, NULL, 0);
}
static struct {
byte major, minor;
byte *msg;
} bgp_msg_table[] = {
{ 1, 0, "Invalid message header" },
{ 1, 1, "Connection not synchronized" },
{ 1, 2, "Bad message length" },
{ 1, 3, "Bad message type" },
{ 2, 0, "Invalid OPEN message" },
{ 2, 1, "Unsupported version number" },
{ 2, 2, "Bad peer AS" },
{ 2, 3, "Bad BGP identifier" },
{ 2, 4, "Unsupported optional parameter" },
{ 2, 5, "Authentication failure" },
{ 2, 6, "Unacceptable hold time" },
{ 2, 7, "Required capability missing" }, /* capability negotiation draft */
{ 3, 0, "Invalid UPDATE message" },
{ 3, 1, "Malformed attribute list" },
{ 3, 2, "Unrecognized well-known attribute" },
{ 3, 3, "Missing mandatory attribute" },
{ 3, 4, "Invalid attribute flags" },
{ 3, 5, "Invalid attribute length" },
{ 3, 6, "Invalid ORIGIN attribute" },
{ 3, 7, "AS routing loop" }, /* Deprecated */
{ 3, 8, "Invalid NEXT_HOP attribute" },
{ 3, 9, "Optional attribute error" },
{ 3, 10, "Invalid network field" },
{ 3, 11, "Malformed AS_PATH" },
{ 4, 0, "Hold timer expired" },
{ 5, 0, "Finite state machine error" },
{ 6, 0, "Cease" }
};
void
bgp_log_error(struct bgp_proto *p, char *msg, unsigned code, unsigned subcode, byte *data, unsigned len)
{
byte *name, namebuf[16];
byte *t, argbuf[36];
unsigned i;
bsprintf(namebuf, "%d.%d", code, subcode);
name = namebuf;
for (i=0; i < ARRAY_SIZE(bgp_msg_table); i++)
if (bgp_msg_table[i].major == code && bgp_msg_table[i].minor == subcode)
{
name = bgp_msg_table[i].msg;
break;
}
t = argbuf;
if (len)
{
*t++ = ':';
*t++ = ' ';
if (len > 16)
len = 16;
for (i=0; i<len; i++)
t += bsprintf(t, "%02x", data[i]);
}
*t = 0;
log(L_REMOTE "%s: %s: %s%s", p->p.name, msg, name, argbuf);
}
static void
@@ -413,18 +469,10 @@ bgp_rx_notification(struct bgp_conn *conn, byte *pkt, int len)
if (len < 21)
{
bgp_error(conn, 1, 2, len, 2);
bgp_error(conn, 1, 2, pkt+16, 2);
return;
}
switch (len)
{
case 21: arg = 0; break;
case 22: arg = pkt[21]; break;
case 23: arg = get_u16(pkt+21); break;
case 25: arg = get_u32(pkt+23); break;
default: DBG("BGP: NOTIFICATION with too much data\n"); /* FIXME */ arg = 0;
}
DBG("BGP: NOTIFICATION %d.%d %08x\n", pkt[19], pkt[20], arg); /* FIXME: Better reporting */
bgp_log_error(conn->bgp, "Received error notification", pkt[19], pkt[20], pkt+21, len-21);
conn->error_flag = 1;
if (conn->primary)
proto_notify_state(&conn->bgp->p, PS_STOP);
@@ -447,7 +495,7 @@ bgp_rx_keepalive(struct bgp_conn *conn, byte *pkt, unsigned len)
case BS_ESTABLISHED:
break;
default:
bgp_error(conn, 5, 0, conn->state, 0);
bgp_error(conn, 5, 0, NULL, 0);
}
}
@@ -461,7 +509,7 @@ bgp_rx_packet(struct bgp_conn *conn, byte *pkt, unsigned len)
case PKT_UPDATE: return bgp_rx_update(conn, pkt, len);
case PKT_NOTIFICATION: return bgp_rx_notification(conn, pkt, len);
case PKT_KEEPALIVE: return bgp_rx_keepalive(conn, pkt, len);
default: bgp_error(conn, 1, 3, pkt[18], 1);
default: bgp_error(conn, 1, 3, pkt+18, 1);
}
}
@@ -478,19 +526,26 @@ bgp_rx(sock *sk, int size)
{
if (conn->error_flag)
{
/*
* We still need to remember the erroneous packet, so that
* we can generate error notifications properly. To avoid
* subsequent reads rewriting the buffer, we just reset the
* rx_hook.
*/
DBG("BGP: Error, dropping input\n");
return 1;
sk->rx_hook = NULL;
return 0;
}
for(i=0; i<16; i++)
if (pkt_start[i] != 0xff)
{
bgp_error(conn, 1, 1, 0, 0);
bgp_error(conn, 1, 1, NULL, 0);
break;
}
len = get_u16(pkt_start+16);
if (len < BGP_HEADER_LENGTH || len > BGP_MAX_PACKET_LENGTH)
{
bgp_error(conn, 1, 2, len, 2);
bgp_error(conn, 1, 2, pkt_start+16, 2);
break;
}
if (end < pkt_start + len)