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gtp: support SGSN-side tunnels

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The GTP-tunnel driver is explicitly GGSN-side as it searches for PDP
contexts based on the incoming packets _destination_ address.  If we
want to place ourselves on the SGSN side of the  tunnel, then we want
to be identifying PDP contexts based on _source_ address.

Let it be noted that in a "real" configuration this module would never
be used:  the SGSN normally does not see IP packets as input.  The
justification for this functionality is for PGW load-testing applications
where the input to the SGSN is locally generally IP traffic.

This patch adds a "role" argument at GTP-link creation time to specify
whether we are on the GGSN or SGSN side of the tunnel; this flag is then
used to determine which part of the IP packet to use in determining
the PDP context.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Harald Welte <laforge@gnumonks.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jonas Bonn
2017-03-24 23:23:21 +01:00
committed by David S. Miller
parent ae6336b57e
commit 91ed81f9ab
2 changed files with 37 additions and 12 deletions
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7
include/uapi/linux/if_link.h
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@@ -538,11 +538,18 @@ enum {
#define IFLA_PPP_MAX (__IFLA_PPP_MAX - 1)
/* GTP section */
enum ifla_gtp_role {
GTP_ROLE_GGSN = 0,
GTP_ROLE_SGSN,
};
enum {
IFLA_GTP_UNSPEC,
IFLA_GTP_FD0,
IFLA_GTP_FD1,
IFLA_GTP_PDP_HASHSIZE,
IFLA_GTP_ROLE,
__IFLA_GTP_MAX,
};
#define IFLA_GTP_MAX (__IFLA_GTP_MAX - 1)