static bool
ebt_among_mt(const struct sk_buff *skb, struct xt_action_param *par) {
const struct ebt_among_info *info = par->matchinfo;
const char *dmac, *smac;
const struct ebt_mac_wormhash *wh_dst, *wh_src;
__be32 dip = 0, sip = 0;
wh_dst = ebt_among_wh_dst(info);
wh_src = ebt_among_wh_src(info);
if (wh_src) {
smac = eth_hdr(skb)->h_source;
if (get_ip_src(skb, &sip)) {
return false;
}
if (!(info->bitmask & EBT_AMONG_SRC_NEG)) {
/* we match only if it contains */
if (!ebt_mac_wormhash_contains(wh_src, smac, sip)) {
return false;
}
} else {
/* we match only if it DOES NOT contain */
if (ebt_mac_wormhash_contains(wh_src, smac, sip)) {
return false;
}
}
}
if (wh_dst) {
dmac = eth_hdr(skb)->h_dest;
if (get_ip_dst(skb, &dip)) {
return false;
}
if (!(info->bitmask & EBT_AMONG_DST_NEG)) {
/* we match only if it contains */
if (!ebt_mac_wormhash_contains(wh_dst, dmac, dip)) {
return false;
}
} else {
/* we match only if it DOES NOT contain */
if (ebt_mac_wormhash_contains(wh_dst, dmac, dip)) {
return false;
}
}
}
return true;
}
static int ebt_filter_among(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out, const void *data,
unsigned int datalen)
{
const struct ebt_among_info *info = data;
const char *dmac, *smac;
const struct ebt_mac_wormhash *wh_dst, *wh_src;
__be32 dip = 0, sip = 0;
wh_dst = ebt_among_wh_dst(info);
wh_src = ebt_among_wh_src(info);
if (wh_src) {
smac = eth_hdr(skb)->h_source;
if (get_ip_src(skb, &sip))
return EBT_NOMATCH;
if (!(info->bitmask & EBT_AMONG_SRC_NEG)) {
/* we match only if it contains */
if (!ebt_mac_wormhash_contains(wh_src, smac, sip))
return EBT_NOMATCH;
} else {
/* we match only if it DOES NOT contain */
if (ebt_mac_wormhash_contains(wh_src, smac, sip))
return EBT_NOMATCH;
}
}
if (wh_dst) {
dmac = eth_hdr(skb)->h_dest;
if (get_ip_dst(skb, &dip))
return EBT_NOMATCH;
if (!(info->bitmask & EBT_AMONG_DST_NEG)) {
/* we match only if it contains */
if (!ebt_mac_wormhash_contains(wh_dst, dmac, dip))
return EBT_NOMATCH;
} else {
/* we match only if it DOES NOT contain */
if (ebt_mac_wormhash_contains(wh_dst, dmac, dip))
return EBT_NOMATCH;
}
}
return EBT_MATCH;
}