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gtp-kernel: Re-add support for kernel GTP-U acceleration 

When we branched off osmo-ggsn from the old openggsn code base, the
support for kernel-gtp got temporarily removed.  This patch
re-introduces support for handling the GTP-U plane in the Linux kernel
by means of libgtpnl + the kernel GTP-U driver.

This only works for IPv4 at the moment, until the kernel GTP-U code
gains IPv6 support.

Kernel GTP currently also is restricted to a single APN per GSN.

Change-Id: Ieb1bc1bd0d51d41947f0abd6ebbc2e5d102592d6
This commit is contained in:
Harald Welte 2017-11-08 14:09:51 +09:00
parent e3c5918aee
commit 490782d18e
1 changed files with 9 additions and 5 deletions
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14
ggsn/ggsn.c
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@ -259,12 +259,16 @@ int apn_start(struct apn_ctx *apn)
apn->tun.tun->priv = apn;
break;
case APN_GTPU_MODE_KERNEL_GTP:
LOGPAPN(LOGL_ERROR, apn, "FIXME: Kernel GTP\n");
#if 0
if (apn->cfg.apn_type_mask & (APN_TYPE_IPv6|APN_TYPE_IPv4v6)) {
LOGPAPN(LOGL_ERROR, apn, "Kernel GTP currently supports only IPv4\n");
apn_stop(apn, false);
return -1;
}
LOGPAPN(LOGL_ERROR, apn, "Setting up Kernel GTP\n");
/* use GTP kernel module for data packet encapsulation */
if (gtp_kernel_init(gsn, &net.v4, prefixlen, net_arg) < 0)
goto err;
#endif
if (gtp_kernel_init(apn->ggsn->gsn, &apn->v4.cfg.ifconfig_prefix, apn->tun.cfg.ipup_script) < 0) {
return -1;
}
break;
default:
LOGPAPN(LOGL_ERROR, apn, "Unknown GTPU Mode %d\n", apn->cfg.gtpu_mode);