• Herbert Xu's avatar
    [IPSEC]: Add ICMP host relookup support · 8b7817f3
    Herbert Xu authored
    RFC 4301 requires us to relookup ICMP traffic that does not match any
    policies using the reverse of its payload.  This patch implements this
    for ICMP traffic that originates from or terminates on localhost.
    
    This is activated on outbound with the new policy flag XFRM_POLICY_ICMP,
    and on inbound by the new state flag XFRM_STATE_ICMP.
    
    On inbound the policy check is now performed by the ICMP protocol so
    that it can repeat the policy check where necessary.
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    8b7817f3
icmp.c 27.9 KB