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authorFlorian Westphal <fw@strlen.de>2013-06-29 14:15:47 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2013-06-30 18:15:48 +0200
commit496e4ae7dc944faa1721bfda7e9d834d5611a874 (patch)
tree7543efa6dbd1432ac7afa0ad641773bc3737e722 /net/netfilter
parent8b4d14d8eb36874daf159d33dcccd4746a6f3189 (diff)
netfilter: nf_queue: add NFQA_SKB_CSUM_NOTVERIFIED info flag
The common case is that TCP/IP checksums have already been verified, e.g. by hardware (rx checksum offload), or conntrack. Userspace can use this flag to determine when the checksum has not been validated yet. If the flag is set, this doesn't necessarily mean that the packet has an invalid checksum, e.g. if NIC doesn't support rx checksum. Userspace that sucessfully enabled NFQA_CFG_F_GSO queue feature flag can infer that IP/TCP checksum has already been validated if either the SKB_INFO attribute is not present or the NFQA_SKB_CSUM_NOTVERIFIED flag is unset. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nfnetlink_queue_core.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index 299a48ae5dc9..971ea145ab3e 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -280,12 +280,17 @@ nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
skb_shinfo(to)->nr_frags = j;
}
-static int nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet)
+static int
+nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
+ bool csum_verify)
{
__u32 flags = 0;
if (packet->ip_summed == CHECKSUM_PARTIAL)
flags = NFQA_SKB_CSUMNOTREADY;
+ else if (csum_verify)
+ flags = NFQA_SKB_CSUM_NOTVERIFIED;
+
if (skb_is_gso(packet))
flags |= NFQA_SKB_GSO;
@@ -310,6 +315,7 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
struct net_device *outdev;
struct nf_conn *ct = NULL;
enum ip_conntrack_info uninitialized_var(ctinfo);
+ bool csum_verify;
size = nlmsg_total_size(sizeof(struct nfgenmsg))
+ nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
@@ -327,6 +333,12 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
if (entskb->tstamp.tv64)
size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
+ if (entry->hook <= NF_INET_FORWARD ||
+ (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
+ csum_verify = !skb_csum_unnecessary(entskb);
+ else
+ csum_verify = false;
+
outdev = entry->outdev;
switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
@@ -476,7 +488,7 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
goto nla_put_failure;
- if (nfqnl_put_packet_info(skb, entskb))
+ if (nfqnl_put_packet_info(skb, entskb, csum_verify))
goto nla_put_failure;
if (data_len) {