Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/net/bridge/netfilter/ebt_among.c b/net/bridge/netfilter/ebt_among.c
new file mode 100644
index 0000000..5a1f5e3
--- /dev/null
+++ b/net/bridge/netfilter/ebt_among.c
@@ -0,0 +1,228 @@
+/*
+ * ebt_among
+ *
+ * Authors:
+ * Grzegorz Borowiak <grzes@gnu.univ.gda.pl>
+ *
+ * August, 2003
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_among.h>
+#include <linux/ip.h>
+#include <linux/if_arp.h>
+#include <linux/module.h>
+
+static int ebt_mac_wormhash_contains(const struct ebt_mac_wormhash *wh,
+ const char *mac, uint32_t ip)
+{
+ /* You may be puzzled as to how this code works.
+ * Some tricks were used, refer to
+ * include/linux/netfilter_bridge/ebt_among.h
+ * as there you can find a solution of this mystery.
+ */
+ const struct ebt_mac_wormhash_tuple *p;
+ int start, limit, i;
+ uint32_t cmp[2] = { 0, 0 };
+ int key = (const unsigned char) mac[5];
+
+ memcpy(((char *) cmp) + 2, mac, 6);
+ start = wh->table[key];
+ limit = wh->table[key + 1];
+ if (ip) {
+ for (i = start; i < limit; i++) {
+ p = &wh->pool[i];
+ if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
+ if (p->ip == 0 || p->ip == ip) {
+ return 1;
+ }
+ }
+ }
+ } else {
+ for (i = start; i < limit; i++) {
+ p = &wh->pool[i];
+ if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
+ if (p->ip == 0) {
+ return 1;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+static int ebt_mac_wormhash_check_integrity(const struct ebt_mac_wormhash
+ *wh)
+{
+ int i;
+
+ for (i = 0; i < 256; i++) {
+ if (wh->table[i] > wh->table[i + 1])
+ return -0x100 - i;
+ if (wh->table[i] < 0)
+ return -0x200 - i;
+ if (wh->table[i] > wh->poolsize)
+ return -0x300 - i;
+ }
+ if (wh->table[256] > wh->poolsize)
+ return -0xc00;
+ return 0;
+}
+
+static int get_ip_dst(const struct sk_buff *skb, uint32_t *addr)
+{
+ if (eth_hdr(skb)->h_proto == htons(ETH_P_IP)) {
+ struct iphdr _iph, *ih;
+
+ ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
+ if (ih == NULL)
+ return -1;
+ *addr = ih->daddr;
+ } else if (eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) {
+ struct arphdr _arph, *ah;
+ uint32_t buf, *bp;
+
+ ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
+ if (ah == NULL ||
+ ah->ar_pln != sizeof(uint32_t) ||
+ ah->ar_hln != ETH_ALEN)
+ return -1;
+ bp = skb_header_pointer(skb, sizeof(struct arphdr) +
+ 2 * ETH_ALEN + sizeof(uint32_t),
+ sizeof(uint32_t), &buf);
+ if (bp == NULL)
+ return -1;
+ *addr = *bp;
+ }
+ return 0;
+}
+
+static int get_ip_src(const struct sk_buff *skb, uint32_t *addr)
+{
+ if (eth_hdr(skb)->h_proto == htons(ETH_P_IP)) {
+ struct iphdr _iph, *ih;
+
+ ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
+ if (ih == NULL)
+ return -1;
+ *addr = ih->saddr;
+ } else if (eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) {
+ struct arphdr _arph, *ah;
+ uint32_t buf, *bp;
+
+ ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
+ if (ah == NULL ||
+ ah->ar_pln != sizeof(uint32_t) ||
+ ah->ar_hln != ETH_ALEN)
+ return -1;
+ bp = skb_header_pointer(skb, sizeof(struct arphdr) +
+ ETH_ALEN, sizeof(uint32_t), &buf);
+ if (bp == NULL)
+ return -1;
+ *addr = *bp;
+ }
+ return 0;
+}
+
+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)
+{
+ struct ebt_among_info *info = (struct ebt_among_info *) data;
+ const char *dmac, *smac;
+ const struct ebt_mac_wormhash *wh_dst, *wh_src;
+ uint32_t 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 int ebt_among_check(const char *tablename, unsigned int hookmask,
+ const struct ebt_entry *e, void *data,
+ unsigned int datalen)
+{
+ struct ebt_among_info *info = (struct ebt_among_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 struct ebt_match filter_among = {
+ .name = EBT_AMONG_MATCH,
+ .match = ebt_filter_among,
+ .check = ebt_among_check,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ return ebt_register_match(&filter_among);
+}
+
+static void __exit fini(void)
+{
+ ebt_unregister_match(&filter_among);
+}
+
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");