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New kernel function to get IP overhead on a socket.

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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>
This commit is contained in:
R. Parameswaran 2017-04-05 16:50:35 -07:00 • committed by David S. Miller
parent 129858fa0b
commit 113c307593
2 changed files with 49 additions and 0 deletions
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3
include/linux/net.h
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@ -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))