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06482c6554
Implement support for PFCP rulesets that ask for mapping a GTP tunnel: forwarding GTP payload between two GTP tunnels. For a GTP tunnel mapping, dispatch netfilter rules that detect GTP packets with a given source address and TEID, and replace the TEID and destination address according to the PFCP ruleset. The netfilter implementation is chosen to effect the packet rewriting and forwarding to take place directly in the kernel, for high throughput of GTP packets. Related: SYS#5599 Change-Id: Ic0d319eb4f98cd51a5999c804c4203ab0bdda650
120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/* Global definitions for OsmoUPF */
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/*
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* (C) 2021-2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved.
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*
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* Author: Neels Janosch Hofmeyr <nhofmeyr@sysmocom.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#pragma once
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#include <osmocom/core/tdef.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/linuxlist.h>
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struct osmo_tdef;
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struct ctrl_handle;
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struct upf_gtp_dev;
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struct nft_ctx;
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#define UPF_PFCP_LISTEN_DEFAULT "0.0.0.0"
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extern struct osmo_tdef_group g_upf_tdef_groups[];
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struct pfcp_vty_cfg {
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char *local_addr;
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uint16_t local_port;
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};
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struct gtp_vty_cfg_dev {
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struct llist_head entry;
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/* If true, osmo-upf creates the GTP device on startup. If false, the GTP device was created by the user, and we
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* just plug into it. */
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bool create;
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/* GTP device name as shown by 'ip link', e.g. 'apn0' */
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char *dev_name;
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/* Which address the GTP device should listen on.
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* When create == true, the GTP kernel module is created to listen on this address.
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* Also used to listen for GTP ECHO requests using libgtp. */
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char *local_addr;
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};
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struct gtp_vty_cfg {
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/* list of struct gtp_vty_cfg_dev, GTP devices as in the config file. The actual GTP devices in use are in
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* g_upf->gtp.devs. */
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struct llist_head devs;
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};
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struct g_upf {
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struct ctrl_handle *ctrl;
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struct {
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struct pfcp_vty_cfg vty_cfg;
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struct up_endpoint *ep;
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} pfcp;
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/* Tunnel encaps decaps via GTP kernel module */
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struct {
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/* if true, don't actually send commands to the GTP kernel module, just return success. */
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bool mockup;
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/* GTP devices as in osmo-upf.cfg */
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struct gtp_vty_cfg vty_cfg;
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/* GTP devices actually in use, list of struct upf_gtp_dev. */
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struct llist_head devs;
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struct mnl_socket *nl;
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int32_t genl_id;
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} gtp;
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/* Tunnel forwarding via linux netfilter */
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struct {
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/* if true, don't actually send commands to nftables, just return success. */
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bool mockup;
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struct nft_ctx *nft_ctx;
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char *table_name;
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int priority;
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uint32_t next_id_state;
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} nft;
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};
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extern struct g_upf *g_upf;
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enum upf_log_subsys {
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DREF,
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DPEER,
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DSESSION,
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DGTP,
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DNFT,
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};
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void g_upf_alloc(void *ctx);
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void upf_vty_init();
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int upf_pfcp_listen();
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int upf_gtp_devs_open();
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void upf_gtp_devs_close();
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