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babeld: Add Flags checking in Hello TLV #18212

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babeld: Add Flags checking in Hello TLV #18212

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8 changes: 8 additions & 0 deletions babeld/message.c
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Original file line number Diff line number Diff line change
Expand Up @@ -411,6 +411,7 @@ parse_packet(const unsigned char *from, struct interface *ifp,
unsigned int timestamp = 0;

#define BABEL_UNICAST_HELLO 0x8000
#define BABEL_MULTICAST_HELLO 0x0000
DO_NTOHS(flags, message + 2);

/*
Expand All @@ -425,6 +426,13 @@ parse_packet(const unsigned char *from, struct interface *ifp,
goto done;
}

if (!CHECK_FLAG(flags, BABEL_MULTICAST_HELLO)) {
debugf(BABEL_DEBUG_COMMON,
"Received Hello from %s on %s with Unknown Flags %d",
format_address(from), ifp->name, flags);
goto done;
}

DO_NTOHS(seqno, message + 4);
DO_NTOHS(interval, message + 6);
debugf(BABEL_DEBUG_COMMON,
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