Resolves: RHEL-3541 - Incorrect handling of a error in parsing of an invalid section of a BGP update can de-peer a router
This commit is contained in:
Michal Ruprich
parent
e980c00e10
commit
0b762a19a7
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@ -0,0 +1,129 @@
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From 46817adab03802355c3cce7b753c7a735bdcc5ae Mon Sep 17 00:00:00 2001
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From: Donatas Abraitis <donatas@opensourcerouting.org>
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Date: Thu, 13 Jul 2023 22:32:03 +0300
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Subject: [PATCH] bgpd: Use treat-as-withdraw for tunnel encapsulation
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attribute
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Before this path we used session reset method, which is discouraged by rfc7606.
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Handle this as rfc requires.
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Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
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(cherry picked from commit bcb6b58d9530173df41d3a3cbc4c600ee0b4b186)
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---
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bgpd/bgp_attr.c | 61 ++++++++++++++++++++-----------------------------
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1 file changed, 25 insertions(+), 36 deletions(-)
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diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
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index 058fae23cbd..1c0803cfd8e 100644
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--- a/bgpd/bgp_attr.c
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+++ b/bgpd/bgp_attr.c
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@@ -1301,6 +1301,7 @@ bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode,
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case BGP_ATTR_LARGE_COMMUNITIES:
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case BGP_ATTR_ORIGINATOR_ID:
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case BGP_ATTR_CLUSTER_LIST:
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+ case BGP_ATTR_ENCAP:
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return BGP_ATTR_PARSE_WITHDRAW;
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case BGP_ATTR_MP_REACH_NLRI:
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case BGP_ATTR_MP_UNREACH_NLRI:
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@@ -2434,26 +2435,21 @@ bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args)
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}
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/* Parse Tunnel Encap attribute in an UPDATE */
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-static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
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- bgp_size_t length, /* IN: attr's length field */
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- struct attr *attr, /* IN: caller already allocated */
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- uint8_t flag, /* IN: attr's flags field */
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- uint8_t *startp)
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+static int bgp_attr_encap(struct bgp_attr_parser_args *args)
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{
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- bgp_size_t total;
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uint16_t tunneltype = 0;
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-
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- total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
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+ struct peer *const peer = args->peer;
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+ struct attr *const attr = args->attr;
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+ bgp_size_t length = args->length;
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+ uint8_t type = args->type;
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+ uint8_t flag = args->flags;
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if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)
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|| !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) {
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- zlog_info(
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- "Tunnel Encap attribute flag isn't optional and transitive %d",
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- flag);
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- bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
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- BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
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- startp, total);
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- return -1;
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+ zlog_err("Tunnel Encap attribute flag isn't optional and transitive %d",
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+ flag);
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+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
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+ args->total);
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}
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if (BGP_ATTR_ENCAP == type) {
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@@ -2461,12 +2457,11 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
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uint16_t tlv_length;
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if (length < 4) {
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- zlog_info(
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+ zlog_err(
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"Tunnel Encap attribute not long enough to contain outer T,L");
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- bgp_notify_send_with_data(
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- peer, BGP_NOTIFY_UPDATE_ERR,
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- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total);
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- return -1;
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+ return bgp_attr_malformed(args,
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+ BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
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+ args->total);
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}
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tunneltype = stream_getw(BGP_INPUT(peer));
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tlv_length = stream_getw(BGP_INPUT(peer));
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@@ -2496,13 +2491,11 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
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}
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if (sublength > length) {
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- zlog_info(
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- "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d",
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- sublength, length);
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- bgp_notify_send_with_data(
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- peer, BGP_NOTIFY_UPDATE_ERR,
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- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total);
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- return -1;
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+ zlog_err("Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d",
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+ sublength, length);
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+ return bgp_attr_malformed(args,
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+ BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
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+ args->total);
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}
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/* alloc and copy sub-tlv */
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@@ -2550,13 +2543,10 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
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if (length) {
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/* spurious leftover data */
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- zlog_info(
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- "Tunnel Encap attribute length is bad: %d leftover octets",
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- length);
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- bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
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- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
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- startp, total);
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- return -1;
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+ zlog_err("Tunnel Encap attribute length is bad: %d leftover octets",
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+ length);
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+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
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+ args->total);
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}
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return 0;
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@@ -3396,8 +3386,7 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
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case BGP_ATTR_VNC:
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#endif
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case BGP_ATTR_ENCAP:
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- ret = bgp_attr_encap(type, peer, length, attr, flag,
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- startp);
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+ ret = bgp_attr_encap(&attr_args);
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break;
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case BGP_ATTR_PREFIX_SID:
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ret = bgp_attr_prefix_sid(&attr_args);
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6
frr.spec
6
frr.spec
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@ -7,7 +7,7 @@
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Name: frr
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Version: 8.3.1
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Release: 11%{?checkout}%{?dist}
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Release: 12%{?checkout}%{?dist}
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Summary: Routing daemon
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License: GPLv2+
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URL: http://www.frrouting.org
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@ -76,6 +76,7 @@ Patch0010: 0010-CVE-2022-43681.patch
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Patch0011: 0011-CVE-2022-40318.patch
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Patch0012: 0012-bfd-not-working-in-vrf.patch
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Patch0013: 0013-bgpd-maxttl-ebgp-multihop.patch
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Patch0014: 0014-CVE-2023-38802.patch
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%description
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FRRouting is free software that manages TCP/IP based routing protocols. It takes
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@ -281,6 +282,9 @@ make check PYTHON=%{__python3}
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%endif
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%changelog
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* Fri Oct 13 2023 Michal Ruprich <mruprich@redhat.com> - 8.3.1-12
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- Resolves: RHEL-3541 - Incorrect handling of a error in parsing of an invalid section of a BGP update can de-peer a router
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* Thu Sep 21 2023 Carlos Goncalves <cgoncalves@redhat.com> - 8.3.1-11
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- Resolves: RHEL-2263 - bgpd: Do not explicitly print MAXTTL value for ebgp-multihop vty output
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