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38b607ece3
This way we can start dropping old osmo-ggsn specific API, avoiding duplication of code. Moreover, the osmo-ggsn code is using older ioctl APIs, which are discouraged nowadays in favour of netlink, which osmo_tundev/osmo_netdev from libosmocore is used. Even better, we win for free non-blocking write behavior in the tundev when switching to the new API, since it already has its own internal wqueue. While doing this, BSD code is dropped since anyway it's not been maintained for a long time. If needed, the BSD support can be added to libosmocore osmo_tundev/osmo_netdev API. This is a first step (already working). Follow-up commits will replace the APIs to set up routes and addresses, and later on osmo-ggsn will win support to set MTU on the interface. Furthermore, this will allow easily adding netns support to osmo-ggsn later on if ever needed. Depends: libosmocore.git Change-Id Ia8a7e7ec6d96c7aebc80528236a0e0d035e7f38d Change-Id: I4d99ba147ac0f3b414d2efef0068b6b8d6cf0014
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
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* TUN interface functions.
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* Copyright (C) 2002, 2003 Mondru AB.
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* Copyright (C) 2017-2018 by Harald Welte <laforge@gnumonks.org>
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*
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* The contents of this file may be used under the terms of the GNU
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* General Public License Version 2, provided that the above copyright
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* notice and this permission notice is included in all copies or
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* substantial portions of the software.
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*
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*/
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#ifndef _TUN_H
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#define _TUN_H
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#include <stdbool.h>
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#include <net/if.h>
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#include <osmocom/core/netdev.h>
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#include <osmocom/core/tun.h>
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#include "../lib/in46_addr.h"
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#define PACKET_MAX 8196 /* Maximum packet size we receive */
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#define TUN_SCRIPTSIZE 256
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#define TUN_ADDRSIZE 128
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#include "config.h"
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#include "netdev.h"
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/* ***********************************************************
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* Information storage for each tun instance
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*************************************************************/
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struct tun_t {
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struct osmo_tundev *tundev;
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struct osmo_netdev *netdev;
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int fd; /* File descriptor to tun interface */
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struct in46_addr addr;
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struct in46_addr dstaddr;
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struct in_addr netmask;
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int addrs; /* Number of allocated IP addresses */
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int routes; /* One if we allocated an automatic route */
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char devname[IFNAMSIZ]; /* Name of the tun device */
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int (*cb_ind) (struct tun_t * tun, void *pack, unsigned len);
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/* to be used by libgtp callers/users (to attach their own private state) */
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void *priv;
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};
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extern int tun_new(struct tun_t **tun, const char *dev_name, bool use_kernel, int fd0, int fd1u);
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extern int tun_free(struct tun_t *tun);
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extern int tun_decaps(struct tun_t *this);
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extern int tun_encaps(struct tun_t *tun, void *pack, unsigned len);
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extern int tun_addaddr(struct tun_t *this, struct in46_addr *addr,
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struct in46_addr *dstaddr, size_t prefixlen);
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extern int tun_set_cb_ind(struct tun_t *this,
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int (*cb_ind) (struct tun_t * tun, void *pack,
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unsigned len));
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extern int tun_runscript(struct tun_t *tun, char *script);
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int tun_ip_local_get(const struct tun_t *tun, struct in46_prefix *prefix_list,
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size_t prefix_size, int flags);
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#define LOGTUN(level, tun, fmt, args...) \
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LOGP(DTUN, level, "TUN(%s): " fmt, (tun)->devname, ## args)
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#endif /* !_TUN_H */
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