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authorFlorian Westphal <fw@strlen.de>2014-01-26 10:58:16 +0100
committerDavid S. Miller <davem@davemloft.net>2014-01-26 22:38:23 -0800
commitde960aa9ab4decc3304959f69533eef64d05d8e8 (patch)
tree1f225ca6fef5512f121856b7572534d2ed171e39 /net/core/skbuff.c
parent77d143de75812596a58d126606f42d1214e09dde (diff)
downloadblackbird-op-linux-de960aa9ab4decc3304959f69533eef64d05d8e8.tar.gz
blackbird-op-linux-de960aa9ab4decc3304959f69533eef64d05d8e8.zip
net: add and use skb_gso_transport_seglen()
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 <fw@strlen.de> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r--net/core/skbuff.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 8f519dbb358b..9ae6d11374d1 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -47,6 +47,8 @@
#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>
@@ -3916,3 +3918,26 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
nf_reset_trace(skb);
}
EXPORT_SYMBOL_GPL(skb_scrub_packet);
+
+/**
+ * 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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