September 2002
Intermediate to advanced
560 pages
13h 16m
English
book
VRRP: Increasing Reliability and Failover with the Virtual Router Redundance Protocol
by Ayikudy Srikanth, Adnan Adam Onart
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C.5. VRRP Header Verification on a Received VRRP Advertisement Packet
/********************************************************* NAME : vrrp_in_chk *********************************************************/ static int vrrp_in_chk( vrrp_rt *vsrv, struct iphdr *ip ) { int ihl = ip->ihl << 2; vrrp_pkt * hd = (vrrp_pkt *)((char *)ip + ihl); vrrp_if *vif = &vsrv->vif; /* MUST verify that the IP TTL is 255 */ if( ip->ttl != VRRP_IP_TTL ) { VRRP_LOG(("invalid ttl. %d and expect %d", ip>ttl,VRRP_IP_TTL)); return 1; } /* MUST verify the VRRP version */ if( (hd->vers_type >> 4) != VRRP_VERSION ){ VRRP_LOG(("invalid version. %d and expect %d" , (hd->vers_type >> 4), VRRP_VERSION)); return 1; } /* MUST verify that the received packet length is greater than ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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