summaryrefslogtreecommitdiff
path: root/include/linux/net.h
diff options
context:
space:
mode:
authorR. Parameswaran <parameswaran.r7@gmail.com>2017-04-05 16:50:35 -0700
committerDavid S. Miller <davem@davemloft.net>2017-04-06 13:43:31 -0700
commit113c3075931a334f899008f6c753abe70a3a9323 (patch)
treea0f7e868672699b451a5053824eea0df16ce07cc /include/linux/net.h
parent129858fa0b1ab3072155718b74bf91e440c2d73f (diff)
New kernel function to get IP overhead on a socket.
A new function, kernel_sock_ip_overhead(), is provided to calculate the cumulative overhead imposed by the IP Header and IP options, if any, on a socket's payload. The new function returns an overhead of zero for sockets that do not belong to the IPv4 or IPv6 address families. This is used in the L2TP code path to compute the total outer IP overhead on the L2TP tunnel socket when calculating the default MTU for Ethernet pseudowires. Signed-off-by: R. Parameswaran <rparames@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/net.h')
-rw-r--r--include/linux/net.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/net.h b/include/linux/net.h
index 0620f5e18c96..a42fab24c8af 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -298,6 +298,9 @@ int kernel_sendpage(struct socket *sock, struct page *page, int offset,
int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how);
+/* Following routine returns the IP overhead imposed by a socket. */
+u32 kernel_sock_ip_overhead(struct sock *sk);
+
#define MODULE_ALIAS_NETPROTO(proto) \
MODULE_ALIAS("net-pf-" __stringify(proto))