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babeld: ignore nonzero flag bits in Hello TLVs

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Ignore all other bits(except U) in Hello TLVs, according to RFC8966
Signed-off-by: zmw12306 <zmw12306@gmail.com>
This commit is contained in:
zmw12306 2023-04-22 15:11:13 -04:00
parent c53ab57b79
commit 673f1d4d57
1 changed files with 0 additions and 12 deletions
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12
babeld/message.c
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@ -413,18 +413,6 @@ parse_packet(const unsigned char *from, struct interface *ifp,
#define BABEL_UNICAST_HELLO 0x8000
DO_NTOHS(flags, message + 2);
/*
* RFC 8966 4.6.5
* All other bits MUST be sent as a 0 and silently
* ignored on reception
*/
if (CHECK_FLAG(flags, ~BABEL_UNICAST_HELLO)) {
debugf(BABEL_DEBUG_COMMON,
"Received Hello from %s on %s that does not have all 0's in the unused section of flags, ignoring",
format_address(from), ifp->name);
goto done;
}
/*
* RFC 8966 Appendix F
* TL;DR -> Please ignore Unicast hellos until FRR's