CARP shares protocol number 112 with VRRP (RFC 5798). And the size of VRRP packet may be smaller than CARP. ipfw_chk() does m_pullup() to at least sizeof(struct carp_header) and can fail when packet is VRRP. This leads to packet drop and message about failed pullup attempt. Also, RFC 5798 defines version 3 of VRRP protocol, this version number also unsupported by CARP and such check leads to packet drop. carp_input() does its own checks for protocol version and packet size, so we can remove these checks to be able pass VRRP packets. PR: 234207 MFC after: 1 week |
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