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ldpd: fix wrong gtsm count #16226

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Jul 2, 2024
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ldpd: fix wrong gtsm count #16226

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12 changes: 12 additions & 0 deletions ldpd/neighbor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -681,6 +681,18 @@ nbr_gtsm_setup(int fd, int af, struct nbr_params *nbrp)
if (nbrp && CHECK_FLAG(nbrp->flags, F_NBRP_GTSM_HOPS))
ttl = 256 - nbrp->gtsm_hops;

/*
* In linux networking stack, the received mpls packets
* will be processed by the host twice, one as mpls packet,
* the other as ip packet, so its ttl will be decreased 1.
* This behavior is based on the new kernel (5.10 and 6.1),
* and older versions may behave differently.
*
* Here, decrease 1 for IP_MINTTL if GTSM is enabled.
* And this workaround makes the GTSM mechanism a bit deviation.
*/
ttl -= 1;
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switch (af) {
case AF_INET:
if (sock_set_ipv4_minttl(fd, ttl) == -1)
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