3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Florian Westphal <f...@strlen.de>
commit de960aa9ab4decc3304959f69533eef64d05d8e8 upstream.
[ no skb_gso_seglen helper in 3.4, leave tbf alone ]
This moves part of Eric Dumazets skb_gso_seglen helper from tbf sched to
skbuff core so it may be reused by upcoming ip forwarding path patch.
Signed-off-by: Florian Westphal <f...@strlen.de>
Acked-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
include/linux/skbuff.h | 2 ++
net/core/skbuff.c | 25 +++++++++++++++++++++++++
2 files changed, 27 insertions(+)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2159,6 +2159,8 @@ extern int skb_shift(struct sk_bu
extern struct sk_buff *skb_segment(struct sk_buff *skb,
netdev_features_t features);
+unsigned int skb_gso_transport_seglen(const struct sk_buff *skb);
+
static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
int len, void *buffer)
{
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -45,6 +45,8 @@
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/slab.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
#include <linux/netdevice.h>
#ifdef CONFIG_NET_CLS_ACT
#include <net/pkt_sched.h>
@@ -3281,3 +3283,26 @@ void __skb_warn_lro_forwarding(const str
" while LRO is enabled\n", skb->dev->name);
}
EXPORT_SYMBOL(__skb_warn_lro_forwarding);
+
+/**
+ * skb_gso_transport_seglen - Return length of individual segments of a gso
packet
+ *
+ * @skb: GSO skb
+ *
+ * skb_gso_transport_seglen is used to determine the real size of the
+ * individual segments, including Layer4 headers (TCP/UDP).
+ *
+ * The MAC/L2 or network (IP, IPv6) headers are not accounted for.
+ */
+unsigned int skb_gso_transport_seglen(const struct sk_buff *skb)
+{
+ const struct skb_shared_info *shinfo = skb_shinfo(skb);
+ unsigned int hdr_len;
+
+ if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
+ hdr_len = tcp_hdrlen(skb);
+ else
+ hdr_len = sizeof(struct udphdr);
+ return hdr_len + shinfo->gso_size;
+}
+EXPORT_SYMBOL_GPL(skb_gso_transport_seglen);
--
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