static int compare(const struct ebt_entry_match *m1,
const struct ebt_entry_match *m2)
{
struct ebt_among_info *a = (struct ebt_among_info *) m1->data;
struct ebt_among_info *b = (struct ebt_among_info *) m2->data;
if (!compare_wh(ebt_among_wh_dst(a), ebt_among_wh_dst(b)))
return 0;
if (!compare_wh(ebt_among_wh_src(a), ebt_among_wh_src(b)))
return 0;
if (a->bitmask != b->bitmask)
return 0;
return 1;
}
static int ebt_among_mt_check(const struct xt_mtchk_param *par) {
const struct ebt_among_info *info = par->matchinfo;
const struct ebt_entry_match *em =
container_of(par->matchinfo, const struct ebt_entry_match, data);
int expected_length = sizeof(struct ebt_among_info);
const struct ebt_mac_wormhash *wh_dst, *wh_src;
int err;
wh_dst = ebt_among_wh_dst(info);
wh_src = ebt_among_wh_src(info);
expected_length += ebt_mac_wormhash_size(wh_dst);
expected_length += ebt_mac_wormhash_size(wh_src);
if (em->match_size != EBT_ALIGN(expected_length)) {
pr_info("wrong size: %d against expected %d, rounded to %Zd\n",
em->match_size, expected_length,
EBT_ALIGN(expected_length));
return -EINVAL;
}
if (wh_dst && (err = ebt_mac_wormhash_check_integrity(wh_dst))) {
pr_info("dst integrity fail: %x\n", -err);
return -EINVAL;
}
if (wh_src && (err = ebt_mac_wormhash_check_integrity(wh_src))) {
pr_info("src integrity fail: %x\n", -err);
return -EINVAL;
}
return 0;
}
static bool ebt_among_mt_check(const struct xt_mtchk_param *par)
{
const struct ebt_among_info *info = par->matchinfo;
const struct ebt_entry_match *em =
container_of(par->matchinfo, const struct ebt_entry_match, data);
int expected_length = sizeof(struct ebt_among_info);
const struct ebt_mac_wormhash *wh_dst, *wh_src;
int err;
wh_dst = ebt_among_wh_dst(info);
wh_src = ebt_among_wh_src(info);
expected_length += ebt_mac_wormhash_size(wh_dst);
expected_length += ebt_mac_wormhash_size(wh_src);
if (em->match_size != EBT_ALIGN(expected_length)) {
printk(KERN_WARNING
"ebtables: among: wrong size: %d "
"against expected %d, rounded to %Zd\n",
em->match_size, expected_length,
EBT_ALIGN(expected_length));
return false;
}
if (wh_dst && (err = ebt_mac_wormhash_check_integrity(wh_dst))) {
printk(KERN_WARNING
"ebtables: among: dst integrity fail: %x\n", -err);
return false;
}
if (wh_src && (err = ebt_mac_wormhash_check_integrity(wh_src))) {
printk(KERN_WARNING
"ebtables: among: src integrity fail: %x\n", -err);
return false;
}
return true;
}
static int ebt_among_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data,
unsigned int datalen)
{
const struct ebt_among_info *info = data;
int expected_length = sizeof(struct ebt_among_info);
const struct ebt_mac_wormhash *wh_dst, *wh_src;
int err;
wh_dst = ebt_among_wh_dst(info);
wh_src = ebt_among_wh_src(info);
expected_length += ebt_mac_wormhash_size(wh_dst);
expected_length += ebt_mac_wormhash_size(wh_src);
if (datalen != EBT_ALIGN(expected_length)) {
printk(KERN_WARNING
"ebtables: among: wrong size: %d "
"against expected %d, rounded to %Zd\n",
datalen, expected_length,
EBT_ALIGN(expected_length));
return -EINVAL;
}
if (wh_dst && (err = ebt_mac_wormhash_check_integrity(wh_dst))) {
printk(KERN_WARNING
"ebtables: among: dst integrity fail: %x\n", -err);
return -EINVAL;
}
if (wh_src && (err = ebt_mac_wormhash_check_integrity(wh_src))) {
printk(KERN_WARNING
"ebtables: among: src integrity fail: %x\n", -err);
return -EINVAL;
}
return 0;
}
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;
}
static void print(const struct ebt_u_entry *entry,
const struct ebt_entry_match *match)
{
struct ebt_among_info *info = (struct ebt_among_info *)match->data;
if (info->wh_dst_ofs) {
printf("--among-dst ");
if (info->bitmask && EBT_AMONG_DST_NEG) {
printf("! ");
}
wormhash_printout(ebt_among_wh_dst(info));
}
if (info->wh_src_ofs) {
printf("--among-src ");
if (info->bitmask && EBT_AMONG_SRC_NEG) {
printf("! ");
}
wormhash_printout(ebt_among_wh_src(info));
}
}