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Merge branch 'act_csum-sctp'

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Davide Caratti says:

====================
net/sched: act_csum: add support for SCTP checksum

This series extends current act_csum functionality to allow computation of
SCTP checksums. Patch 1 ensures LIBCRC32C will be selected if NET_ACT_CSUM
is selected. Patch 2 extends act_csum to handle IPPROTO_SCTP protocol in
IPv4/IPv6 header, and eventually compute the CRC32c value.

v2:
- style fix in tc_csum.h
- avoid nested if statement in act_csum.c
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-01-09 14:36:58 -05:00
commit 512656008a
3 changed files with 33 additions and 1 deletions
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3
include/uapi/linux/tc_act/tc_csum.h
View file

@ -21,7 +21,8 @@ enum {
TCA_CSUM_UPDATE_FLAG_IGMP = 4,
TCA_CSUM_UPDATE_FLAG_TCP = 8,
TCA_CSUM_UPDATE_FLAG_UDP = 16,
TCA_CSUM_UPDATE_FLAG_UDPLITE = 32
TCA_CSUM_UPDATE_FLAG_UDPLITE = 32,
TCA_CSUM_UPDATE_FLAG_SCTP = 64,
};
struct tc_csum {

1
net/sched/Kconfig
View file

@ -707,6 +707,7 @@ config NET_ACT_SKBEDIT
config NET_ACT_CSUM
tristate "Checksum Updating"
depends on NET_CLS_ACT && INET
select LIBCRC32C
---help---
Say Y here to update some common checksum after some direct
packet alterations.

30
net/sched/act_csum.c
View file

@ -30,6 +30,7 @@
#include <net/tcp.h>
#include <net/udp.h>
#include <net/ip6_checksum.h>
#include <net/sctp/checksum.h>
#include <net/act_api.h>
@ -322,6 +323,25 @@ ignore_obscure_skb:
return 1;
}
static int tcf_csum_sctp(struct sk_buff *skb, unsigned int ihl,
unsigned int ipl)
{
struct sctphdr *sctph;
if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_SCTP)
return 1;
sctph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*sctph));
if (!sctph)
return 0;
sctph->checksum = sctp_compute_cksum(skb,
skb_network_offset(skb) + ihl);
skb->ip_summed = CHECKSUM_NONE;
return 1;
}
static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
{
const struct iphdr *iph;
@ -365,6 +385,11 @@ static int tcf_csum_ipv4(struct sk_buff *skb, u32 update_flags)
ntohs(iph->tot_len), 1))
goto fail;
break;
case IPPROTO_SCTP:
if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
!tcf_csum_sctp(skb, iph->ihl * 4, ntohs(iph->tot_len)))
goto fail;
break;
}
if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
@ -481,6 +506,11 @@ static int tcf_csum_ipv6(struct sk_buff *skb, u32 update_flags)
pl + sizeof(*ip6h), 1))
goto fail;
goto done;
case IPPROTO_SCTP:
if ((update_flags & TCA_CSUM_UPDATE_FLAG_SCTP) &&
!tcf_csum_sctp(skb, hl, pl + sizeof(*ip6h)))
goto fail;
goto done;
default:
goto ignore_skb;
}