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Message-Id: <c9ee721fd7816b9d30939f23783f50f9aeb00d66.1483630849.git.dcaratti@redhat.com>
Date: Thu, 5 Jan 2017 17:59:03 +0100
From: Davide Caratti <dcaratti@...hat.com>
To: Jamal Hadi Salim <jhs@...atatu.com>,
"David S . Miller" <davem@...emloft.net>,
Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: netdev@...r.kernel.org
Subject: [PATCH net-next 2/2] net/sched: act_csum: compute crc32c on SCTP packets
modify act_csum to compute crc32c on IPv4/IPv6 packets having SCTP in
their payload, and extend UAPI definitions accordingly.
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
include/uapi/linux/tc_act/tc_csum.h | 3 ++-
net/sched/act_csum.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/tc_act/tc_csum.h b/include/uapi/linux/tc_act/tc_csum.h
index 8ac8041..58d457f 100644
--- a/include/uapi/linux/tc_act/tc_csum.h
+++ b/include/uapi/linux/tc_act/tc_csum.h
@@ -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 {
diff --git a/net/sched/act_csum.c b/net/sched/act_csum.c
index a0edd80..620ac9b 100644
--- a/net/sched/act_csum.c
+++ b/net/sched/act_csum.c
@@ -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 @@ static int tcf_csum_ipv6_udp(struct sk_buff *skb, unsigned int ihl,
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 +385,12 @@ 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)
+ if (!tcf_csum_sctp(skb, iph->ihl * 4,
+ ntohs(iph->tot_len)))
+ goto fail;
+ break;
}
if (update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) {
@@ -481,6 +507,12 @@ 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)
+ if (!tcf_csum_sctp(skb, hl,
+ pl + sizeof(*ip6h)))
+ goto fail;
+ goto done;
default:
goto ignore_skb;
}
--
2.7.4
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