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77 lines
2.5 KiB
77 lines
2.5 KiB
8 months ago
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From b08afc81c60607a4f736f418f2e3eb06087f1a35 Mon Sep 17 00:00:00 2001
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From: Donatas Abraitis <donatas@opensourcerouting.org>
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Date: Fri, 20 Oct 2023 17:49:18 +0300
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Subject: [PATCH] bgpd: Handle MP_REACH_NLRI malformed packets with session
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reset
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Avoid crashing bgpd.
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Reported-by: Iggy Frankovic <iggyfran@amazon.com>
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Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
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---
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bgpd/bgp_attr.c | 6 +-----
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bgpd/bgp_attr.h | 1 -
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bgpd/bgp_packet.c | 6 +-----
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3 files changed, 2 insertions(+), 11 deletions(-)
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diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
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index 6925aff727e2..e7bb42a5d989 100644
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--- a/bgpd/bgp_attr.c
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+++ b/bgpd/bgp_attr.c
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@@ -2421,7 +2421,7 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
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mp_update->afi = afi;
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mp_update->safi = safi;
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- return BGP_ATTR_PARSE_EOR;
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+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_ATTR, 0);
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}
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mp_update->afi = afi;
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@@ -3759,10 +3759,6 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
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goto done;
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}
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- if (ret == BGP_ATTR_PARSE_EOR) {
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- goto done;
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- }
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-
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if (ret == BGP_ATTR_PARSE_ERROR) {
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flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR,
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"%s: Attribute %s, parse error", peer->host,
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diff --git a/bgpd/bgp_attr.h b/bgpd/bgp_attr.h
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index 961e5f122470..fc347e7a1b4b 100644
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--- a/bgpd/bgp_attr.h
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+++ b/bgpd/bgp_attr.h
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@@ -364,7 +364,6 @@ enum bgp_attr_parse_ret {
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/* only used internally, send notify + convert to BGP_ATTR_PARSE_ERROR
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*/
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BGP_ATTR_PARSE_ERROR_NOTIFYPLS = -3,
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- BGP_ATTR_PARSE_EOR = -4,
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BGP_ATTR_PARSE_MISSING_MANDATORY = -5,
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};
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diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
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index b585591e2f69..5ecf343b6657 100644
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--- a/bgpd/bgp_packet.c
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+++ b/bgpd/bgp_packet.c
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@@ -2397,8 +2397,7 @@ static int bgp_update_receive(struct peer_connection *connection,
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* Non-MP IPv4/Unicast EoR is a completely empty UPDATE
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* and MP EoR should have only an empty MP_UNREACH
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*/
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- if ((!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0)
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- || (attr_parse_ret == BGP_ATTR_PARSE_EOR)) {
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+ if (!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0) {
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afi_t afi = 0;
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safi_t safi;
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struct graceful_restart_info *gr_info;
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@@ -2419,9 +2418,6 @@ static int bgp_update_receive(struct peer_connection *connection,
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&& nlris[NLRI_MP_WITHDRAW].length == 0) {
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afi = nlris[NLRI_MP_WITHDRAW].afi;
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safi = nlris[NLRI_MP_WITHDRAW].safi;
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- } else if (attr_parse_ret == BGP_ATTR_PARSE_EOR) {
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- afi = nlris[NLRI_MP_UPDATE].afi;
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- safi = nlris[NLRI_MP_UPDATE].safi;
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}
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if (afi && peer->afc[afi][safi]) {
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