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netfilter: nfnetlink_queue: avoid expensive gso segmentation and checksum fixup 

Userspace can now indicate that it can cope with larger-than-mtu sized
packets and packets that have invalid ipv4/tcp checksums.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2013-04-19 04:58:27 +00:00 committed by Pablo Neira Ayuso
parent 7237190df8
commit 00bd1cc24a
2 changed files with 5 additions and 3 deletions
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3
include/uapi/linux/netfilter/nfnetlink_queue.h
View File

@ -97,7 +97,8 @@ enum nfqnl_attr_config {
/* Flags for NFQA_CFG_FLAGS */
#define NFQA_CFG_F_FAIL_OPEN (1 << 0)
#define NFQA_CFG_F_CONNTRACK (1 << 1)
#define NFQA_CFG_F_MAX (1 << 2)
#define NFQA_CFG_F_GSO (1 << 2)
#define NFQA_CFG_F_MAX (1 << 3)
/* flags for NFQA_SKB_INFO */
/* packet appears to have wrong checksums, but they are ok */

5
net/netfilter/nfnetlink_queue_core.c
View File

@ -327,7 +327,8 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
break;
case NFQNL_COPY_PACKET:
if (entskb->ip_summed == CHECKSUM_PARTIAL &&
if (!(queue->flags & NFQA_CFG_F_GSO) &&
entskb->ip_summed == CHECKSUM_PARTIAL &&
skb_checksum_help(entskb))
return NULL;
@ -636,7 +637,7 @@ nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
if (queue->copy_mode == NFQNL_COPY_NONE)
return -EINVAL;
if (!skb_is_gso(entry->skb))
if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(entry->skb))
return __nfqnl_enqueue_packet(net, queue, entry);
skb = entry->skb;