From: Stephane Bryant <stephane.ml.bryant@xxxxxxxxx>
- This creates 2 netlink attribute NFQA_VLAN and NFQA_L2HDR.
- These are filled up for the PF_BRIDGE family on the way to userspace.
- NFQA_VLAN is a nested attribute, with the NFQA_VLAN_PROTO and the
NFQA_VLAN_TCI carrying the corresponding vlan_proto and vlan_tci
fields from the skb using big endian ordering (and using the CFI
bit as the VLAN_TAG_PRESENT flag in vlan_tci as in the skb)
Signed-off-by: Stephane Bryant <stephane.ml.bryant@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
include/uapi/linux/netfilter/nfnetlink_queue.h | 10 +++++
net/netfilter/nfnetlink_queue.c | 58 ++++++++++++++++++++++++++
2 files changed, 68 insertions(+)
diff --git a/include/uapi/linux/netfilter/nfnetlink_queue.h b/include/uapi/linux/netfilter/nfnetlink_queue.h
index b67a853..ae30841 100644
--- a/include/uapi/linux/netfilter/nfnetlink_queue.h
+++ b/include/uapi/linux/netfilter/nfnetlink_queue.h
@@ -30,6 +30,14 @@ struct nfqnl_msg_packet_timestamp {
__aligned_be64 usec;
};
+enum nfqnl_vlan_attr {
+ NFQA_VLAN_UNSPEC,
+ NFQA_VLAN_PROTO, /* __be16 skb vlan_proto */
+ NFQA_VLAN_TCI, /* __be16 skb htons(vlan_tci) */
+ __NFQA_VLAN_MAX,
+};
+#define NFQA_VLAN_MAX (__NFQA_VLAN_MAX + 1)
+
enum nfqnl_attr_type {
NFQA_UNSPEC,
NFQA_PACKET_HDR,
@@ -50,6 +58,8 @@ enum nfqnl_attr_type {
NFQA_UID, /* __u32 sk uid */
NFQA_GID, /* __u32 sk gid */
NFQA_SECCTX, /* security context string */
+ NFQA_VLAN, /* nested attribute: packet vlan info */
+ NFQA_L2HDR, /* full L2 header */
__NFQA_MAX
};
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 7542999..6889c7c 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -295,6 +295,59 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
return seclen;
}
+static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry)
+{
+ struct sk_buff *entskb = entry->skb;
+ u32 nlalen = 0;
+
+ if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
+ return 0;
+
+ if (skb_vlan_tag_present(entskb))
+ nlalen += nla_total_size(nla_total_size(sizeof(__be16)) +
+ nla_total_size(sizeof(__be16)));
+
+ if (entskb->network_header > entskb->mac_header)
+ nlalen += nla_total_size((entskb->network_header -
+ entskb->mac_header));
+
+ return nlalen;
+}
+
+static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb)
+{
+ struct sk_buff *entskb = entry->skb;
+
+ if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
+ return 0;
+
+ if (skb_vlan_tag_present(entskb)) {
+ struct nlattr *nest;
+
+ nest = nla_nest_start(skb, NFQA_VLAN | NLA_F_NESTED);
+ if (!nest)
+ goto nla_put_failure;
+
+ if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) ||
+ nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto))
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest);
+ }
+
+ if (entskb->mac_header < entskb->network_header) {
+ int len = (int)(entskb->network_header - entskb->mac_header);
+
+ if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb)))
+ goto nla_put_failure;
+ }
+
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
static struct sk_buff *
nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
struct nf_queue_entry *entry,
@@ -334,6 +387,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
if (entskb->tstamp.tv64)
size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
+ size += nfqnl_get_bridge_size(entry);
+
if (entry->state.hook <= NF_INET_FORWARD ||
(entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
csum_verify = !skb_csum_unnecessary(entskb);
@@ -497,6 +552,9 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
}
}
+ if (nfqnl_put_bridge(entry, skb) < 0)
+ goto nla_put_failure;
+
if (entskb->tstamp.tv64) {
struct nfqnl_msg_packet_timestamp ts;
struct timespec64 kts = ktime_to_timespec64(skb->tstamp);
--
2.1.4
--
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