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bgpd: Adjust terminology related to DSCP

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The default DSCP used for BGP connections is CS6. The DSCP value is
not part of the TCP header.

When setting the IP_TOS or IPV6_TCLASS socket options, the argument
is not the 6-bit DSCP value, but an 8-bit value for the former IPv4
Type of Service field or IPv6 Traffic Class field, respectively.

Fixes: 425bd64be8 ("bgpd: Allow bgp to control the DSCP session TOS value")
Signed-off-by: David Ward <david.ward@ll.mit.edu>
This commit is contained in:
David Ward 2024-06-02 06:42:23 -04:00
parent 8954dd3a6b
commit 172dd682d9
5 changed files with 18 additions and 18 deletions
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8
bgpd/bgp_network.c
View File

@ -817,9 +817,9 @@ int bgp_connect(struct peer_connection *connection)
#ifdef IPTOS_PREC_INTERNETCONTROL
frr_with_privs(&bgpd_privs) {
if (sockunion_family(&connection->su) == AF_INET)
setsockopt_ipv4_tos(connection->fd, bm->tcp_dscp);
setsockopt_ipv4_tos(connection->fd, bm->ip_tos);
else if (sockunion_family(&connection->su) == AF_INET6)
setsockopt_ipv6_tclass(connection->fd, bm->tcp_dscp);
setsockopt_ipv6_tclass(connection->fd, bm->ip_tos);
}
#endif
@ -905,9 +905,9 @@ static int bgp_listener(int sock, struct sockaddr *sa, socklen_t salen,
#ifdef IPTOS_PREC_INTERNETCONTROL
if (sa->sa_family == AF_INET)
setsockopt_ipv4_tos(sock, bm->tcp_dscp);
setsockopt_ipv4_tos(sock, bm->ip_tos);
else if (sa->sa_family == AF_INET6)
setsockopt_ipv6_tclass(sock, bm->tcp_dscp);
setsockopt_ipv6_tclass(sock, bm->ip_tos);
#endif
sockopt_v6only(sa->sa_family, sock);

18
bgpd/bgp_vty.c
View File

@ -1760,10 +1760,10 @@ DEFPY (bgp_session_dscp,
bgp_session_dscp_cmd,
"bgp session-dscp (0-63)$dscp",
BGP_STR
"Override default (C6) bgp TCP session DSCP value\n"
"Manually configured dscp parameter\n")
"Override default (CS6) DSCP for BGP connections\n"
"Manually configured DSCP value\n")
{
bm->tcp_dscp = dscp << 2;
bm->ip_tos = dscp << 2;
return CMD_SUCCESS;
}
@ -1773,10 +1773,10 @@ DEFPY (no_bgp_session_dscp,
"no bgp session-dscp [(0-63)]",
NO_STR
BGP_STR
"Override default (C6) bgp TCP session DSCP value\n"
"Manually configured dscp parameter\n")
"Override default (CS6) DSCP for BGP connections\n"
"Manually configured DSCP value\n")
{
bm->tcp_dscp = IPTOS_PREC_INTERNETCONTROL;
bm->ip_tos = IPTOS_PREC_INTERNETCONTROL;
return CMD_SUCCESS;
}
@ -19191,9 +19191,9 @@ int bgp_config_write(struct vty *vty)
if (CHECK_FLAG(bm->flags, BM_FLAG_SEND_EXTRA_DATA_TO_ZEBRA))
vty_out(vty, "bgp send-extra-data zebra\n");
/* BGP session DSCP value */
if (bm->tcp_dscp != IPTOS_PREC_INTERNETCONTROL)
vty_out(vty, "bgp session-dscp %u\n", bm->tcp_dscp >> 2);
/* DSCP value for outgoing packets in BGP connections */
if (bm->ip_tos != IPTOS_PREC_INTERNETCONTROL)
vty_out(vty, "bgp session-dscp %u\n", bm->ip_tos >> 2);
/* BGP InQ limit */
if (bm->inq_limit != BM_DEFAULT_Q_LIMIT)

2
bgpd/bgpd.c
View File

@ -8375,7 +8375,7 @@ void bgp_master_init(struct event_loop *master, const int buffer_size,
bm->terminating = false;
bm->socket_buffer = buffer_size;
bm->wait_for_fib = false;
bm->tcp_dscp = IPTOS_PREC_INTERNETCONTROL;
bm->ip_tos = IPTOS_PREC_INTERNETCONTROL;
bm->inq_limit = BM_DEFAULT_Q_LIMIT;
bm->outq_limit = BM_DEFAULT_Q_LIMIT;
bm->t_bgp_sync_label_manager = NULL;

4
bgpd/bgpd.h
View File

@ -166,8 +166,8 @@ struct bgp_master {
bool terminating; /* global flag that sigint terminate seen */
/* DSCP value for TCP sessions */
uint8_t tcp_dscp;
/* TOS value for outgoing packets in BGP connections */
uint8_t ip_tos;
#define BM_DEFAULT_Q_LIMIT 10000
uint32_t inq_limit;

4
doc/user/bgp.rst
View File

@ -4933,8 +4933,8 @@ setting.
.. clicmd:: bgp session-dscp (0-63)
This command allows bgp to control, at a global level, the TCP dscp values
in the TCP header.
This command allows the BGP daemon to control, at a global level, the DSCP value
used in outgoing packets for each BGP connection.
.. _bgp-suppress-fib: