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netfilter: nft_meta: add pkttype support 

Add pkttype support for ip, ipv6 and inet families of tables.

This allows you to fetch the meta packet type based on the link layer
information. The loopback traffic is a special case, the packet type
is guessed from the network layer header.

No special handling for bridge and arp since we're not going to see
such traffic in the loopback interface.

Joint work with Alvaro Neira Ayuso <alvaroneay@gmail.com>

Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Ana Rey 2014-08-06 13:52:49 +02:00 committed by Pablo Neira Ayuso
parent e91ded8db5
commit e2a093ff0d
2 changed files with 30 additions and 0 deletions
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2
include/uapi/linux/netfilter/nf_tables.h
View File

@ -571,6 +571,7 @@ enum nft_exthdr_attributes {
* @NFT_META_L4PROTO: layer 4 protocol number
* @NFT_META_BRI_IIFNAME: packet input bridge interface name
* @NFT_META_BRI_OIFNAME: packet output bridge interface name
* @NFT_META_PKTTYPE: packet type (skb->pkt_type), special handling for loopback
*/
enum nft_meta_keys {
NFT_META_LEN,
@ -592,6 +593,7 @@ enum nft_meta_keys {
NFT_META_L4PROTO,
NFT_META_BRI_IIFNAME,
NFT_META_BRI_OIFNAME,
NFT_META_PKTTYPE,
};
/**

28
net/netfilter/nft_meta.c
View File

@ -14,6 +14,9 @@
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/dst.h>
#include <net/sock.h>
#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
@ -124,6 +127,30 @@ void nft_meta_get_eval(const struct nft_expr *expr,
dest->data[0] = skb->secmark;
break;
#endif
case NFT_META_PKTTYPE:
if (skb->pkt_type != PACKET_LOOPBACK) {
dest->data[0] = skb->pkt_type;
break;
}
switch (pkt->ops->pf) {
case NFPROTO_IPV4:
if (ipv4_is_multicast(ip_hdr(skb)->daddr))
dest->data[0] = PACKET_MULTICAST;
else
dest->data[0] = PACKET_BROADCAST;
break;
case NFPROTO_IPV6:
if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
dest->data[0] = PACKET_MULTICAST;
else
dest->data[0] = PACKET_BROADCAST;
break;
default:
WARN_ON(1);
goto err;
}
break;
default:
WARN_ON(1);
goto err;
@ -195,6 +222,7 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
#ifdef CONFIG_NETWORK_SECMARK
case NFT_META_SECMARK:
#endif
case NFT_META_PKTTYPE:
break;
default:
return -EOPNOTSUPP;