gprs_ns2_frgre.c File Reference

NS-over-FR-over-GRE implementation. More...

#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <arpa/inet.h>
#include <osmocom/core/byteswap.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/talloc.h>
#include <osmocom/gprs/gprs_ns2.h>
#include "gprs_ns2_internal.h"

Data Structures
struct	gre_hdr
struct	priv_bind
struct	priv_vc

Macros
#define	GRE_PTYPE_FR   0x6559
#define	GRE_PTYPE_IPv4   0x0800
#define	GRE_PTYPE_IPv6   0x86dd
#define	GRE_PTYPE_KAR   0x0000 /* keepalive response */
#define	IPPROTO_GRE   47

Functions
struct gre_hdr	__attribute__ ((packed))
static void	free_bind (struct gprs_ns2_vc_bind *bind)
	clean up all private driver state. More...
static int	frgre_sendmsg (struct gprs_ns2_vc_bind *bind, struct msgb *msg, struct osmo_sockaddr *dest)
static void	free_vc (struct gprs_ns2_vc *nsvc)
static struct priv_vc *	frgre_alloc_vc (struct gprs_ns2_vc_bind *bind, struct gprs_ns2_vc *nsvc, struct osmo_sockaddr *remote, uint16_t dlci)
static int	handle_rx_gre_ipv6 (struct osmo_fd *bfd, struct msgb *msg, struct ip6_hdr *ip6hdr, struct gre_hdr *greh)
static int	handle_rx_gre_ipv4 (struct osmo_fd *bfd, struct msgb *msg, struct iphdr *iph, struct gre_hdr *greh)
static struct msgb *	read_nsfrgre_msg (struct osmo_fd *bfd, int *error, struct osmo_sockaddr *saddr, uint16_t *dlci, const struct gprs_ns2_vc_bind *bind)
static int	ns2_find_vc_by_dlci (struct gprs_ns2_vc_bind *bind, uint16_t dlci, struct gprs_ns2_vc **result)
static int	handle_nsfrgre_read (struct osmo_fd *bfd)
static int	handle_nsfrgre_write (struct osmo_fd *bfd)
static int	frgre_vc_sendmsg (struct gprs_ns2_vc *nsvc, struct msgb *msg)
static int	frgre_fd_cb (struct osmo_fd *bfd, unsigned int what)
int	gprs_ns2_is_frgre_bind (struct gprs_ns2_vc_bind *bind)
	determine if given bind is for FR-GRE encapsulation. More...
int	gprs_ns2_frgre_bind (struct gprs_ns2_inst *nsi, const char *name, const struct osmo_sockaddr *local, int dscp, struct gprs_ns2_vc_bind **result)
	Create a new bind for NS over FR-GRE. More...

Variables
uint16_t	flags
uint16_t	ptype
struct gprs_ns2_vc_driver	vc_driver_frgre
struct priv_bind	__attribute__

Detailed Description

NS-over-FR-over-GRE implementation.

GPRS Networks Service (NS) messages on the Gb interface. 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) as well as its successor 3GPP TS 48.016

Macro Definition Documentation

GRE_PTYPE_FR

#define GRE_PTYPE_FR   0x6559

GRE_PTYPE_IPv4

#define GRE_PTYPE_IPv4   0x0800

GRE_PTYPE_IPv6

#define GRE_PTYPE_IPv6   0x86dd

GRE_PTYPE_KAR

#define GRE_PTYPE_KAR   0x0000 /* keepalive response */

IPPROTO_GRE

#define IPPROTO_GRE   47

Function Documentation

free_bind()

static void free_bind ( struct gprs_ns2_vc_bind *  bind )

static

clean up all private driver state.

Should be only called by gprs_ns2_free_bind()

References priv_bind::fd, llist_empty(), gprs_ns2_vc_bind::nsvc, OSMO_ASSERT, osmo_fd_close(), and gprs_ns2_vc_bind::priv.

free_vc()

static void free_vc ( struct gprs_ns2_vc *  nsvc )

static

References OSMO_ASSERT, and gprs_ns2_vc::priv.

Referenced by gprs_ns2_frgre_bind().

frgre_alloc_vc()

static struct priv_vc * frgre_alloc_vc ( struct gprs_ns2_vc_bind *  bind, struct gprs_ns2_vc *  nsvc, struct osmo_sockaddr *  remote, uint16_t  dlci  )

static

References priv_vc::dlci, gprs_ns2_vc::priv, and priv_vc::remote.

Referenced by handle_nsfrgre_read().

frgre_fd_cb()

static int frgre_fd_cb ( struct osmo_fd *  bfd, unsigned int  what  )

static

References handle_nsfrgre_read(), handle_nsfrgre_write(), OSMO_FD_READ, and OSMO_FD_WRITE.

Referenced by gprs_ns2_frgre_bind().

frgre_sendmsg()

static int frgre_sendmsg ( struct gprs_ns2_vc_bind *  bind, struct msgb *  msg, struct osmo_sockaddr *  dest  )

inlinestatic

References osmo_fd::fd, priv_bind::fd, msg, msgb_free(), gprs_ns2_vc_bind::priv, osmo_sockaddr::sa, and osmo_sockaddr::u.

Referenced by frgre_vc_sendmsg(), and handle_nsfrgre_read().

frgre_vc_sendmsg()

static int frgre_vc_sendmsg ( struct gprs_ns2_vc *  nsvc, struct msgb *  msg  )

static

References priv_bind::dlci, gre_hdr::flags, frgre_sendmsg(), GRE_PTYPE_FR, msg, msgb_length(), msgb_push(), NS_CTR_BYTES_OUT, NS_CTR_BYTES_OUT_DROP, NS_CTR_PKTS_OUT, NS_CTR_PKTS_OUT_DROP, gprs_ns2_vc_bind::nsvc, osmo_htons, OSMO_LIKELY, gprs_ns2_vc::priv, gprs_ns2_vc_bind::priv, gre_hdr::ptype, RATE_CTR_ADD_NS, RATE_CTR_INC_NS, and priv_vc::remote.

Referenced by gprs_ns2_frgre_bind().

gprs_ns2_frgre_bind()

int gprs_ns2_frgre_bind	(	struct gprs_ns2_inst *	nsi,
		const char *	name,
		const struct osmo_sockaddr *	local,
		int	dscp,
		struct gprs_ns2_vc_bind **	result
	)

Create a new bind for NS over FR-GRE.

Parameters

[in]	nsi	NS instance in which to create the bind
[in]	local	local address on which to bind
[in]	dscp	DSCP/TOS bits to use for transmitted data on this bind
[out]	result	pointer to the created bind or if a bind with the name exists return the bind.

Returns

0 on success; negative on error. -EALREADY returned in case a bind with the name exists

References priv_bind::addr, osmo_fd::cb, osmo_fd::data, gprs_ns2_vc_bind::driver, priv_bind::dscp, priv_bind::fd, FRAME_RELAY_SDU, free_vc(), gprs_ns2_vc_bind::free_vc, frgre_fd_cb(), frgre_vc_sendmsg(), gprs_ns2_bind_by_name(), gprs_ns2_free_bind(), GPRS_NS2_LL_FR_GRE, INIT_LLIST_HEAD, IPPROTO_GRE, gprs_ns2_vc_bind::ll, gprs_ns2_vc_bind::mtu, name, ns2_bind_alloc(), gprs_ns2_vc_bind::nsi, gprs_ns2_vc_bind::nsvc, OSMO_SOCK_F_BIND, OSMO_SOCK_F_DSCP, osmo_sock_init_osa_ofd(), gprs_ns2_vc_bind::priv, osmo_sockaddr::sa, gprs_ns2_vc_bind::send_vc, gprs_ns2_vc_bind::transfer_capability, osmo_sockaddr::u, and vc_driver_frgre.

gprs_ns2_is_frgre_bind()

int gprs_ns2_is_frgre_bind

(

struct gprs_ns2_vc_bind *

bind

)

determine if given bind is for FR-GRE encapsulation.

References gprs_ns2_vc_bind::driver, and vc_driver_frgre.

handle_nsfrgre_read()

static int handle_nsfrgre_read ( struct osmo_fd *  bfd )

static

References osmo_fd::data, frgre_alloc_vc(), frgre_sendmsg(), LOGBIND, LOGL_INFO, msg, msgb_free(), ns2_create_vc(), NS2_CS_CREATED, NS2_CS_ERROR, NS2_CS_FOUND, NS2_CS_REJECTED, NS2_CS_SKIPPED, ns2_find_vc_by_dlci(), ns2_recv_vc(), ns2_vc_fsm_start(), and read_nsfrgre_msg().

Referenced by frgre_fd_cb().

handle_nsfrgre_write()

static int handle_nsfrgre_write ( struct osmo_fd *  bfd )

static

Referenced by frgre_fd_cb().

handle_rx_gre_ipv4()

static int handle_rx_gre_ipv4 ( struct osmo_fd *  bfd, struct msgb *  msg, struct iphdr *  iph, struct gre_hdr *  greh  )

static

References osmo_fd::data, osmo_fd::fd, priv_bind::fd, GRE_PTYPE_KAR, IPPROTO_GRE, LOGBIND, LOGL_DEBUG, LOGL_ERROR, msg, osmo_htons, gprs_ns2_vc_bind::priv, and gre_hdr::ptype.

Referenced by read_nsfrgre_msg().

handle_rx_gre_ipv6()

static int handle_rx_gre_ipv6 ( struct osmo_fd *  bfd, struct msgb *  msg, struct ip6_hdr *  ip6hdr, struct gre_hdr *  greh  )

static

References osmo_fd::data, osmo_fd::fd, priv_bind::fd, GRE_PTYPE_KAR, IPPROTO_GRE, LOGBIND, LOGL_DEBUG, LOGL_ERROR, msg, osmo_htons, gprs_ns2_vc_bind::priv, and gre_hdr::ptype.

Referenced by read_nsfrgre_msg().

ns2_find_vc_by_dlci()

static int ns2_find_vc_by_dlci ( struct gprs_ns2_vc_bind *  bind, uint16_t  dlci, struct gprs_ns2_vc **  result  )

static

References priv_vc::dlci, llist_for_each_entry, gprs_ns2_vc_bind::nsvc, and gprs_ns2_vc::priv.

Referenced by handle_nsfrgre_read().

read_nsfrgre_msg()

static struct msgb * read_nsfrgre_msg ( struct osmo_fd *  bfd, int *  error, struct osmo_sockaddr *  saddr, uint16_t *  dlci, const struct gprs_ns2_vc_bind *  bind  )

static

References osmo_fd::fd, gre_hdr::flags, GRE_PTYPE_FR, GRE_PTYPE_IPv4, GRE_PTYPE_IPv6, handle_rx_gre_ipv4(), handle_rx_gre_ipv6(), if(), LOGBIND, LOGL_ERROR, LOGL_NOTICE, msg, msgb_alloc(), msgb_free(), msgb_put(), NS_ALLOC_SIZE, osmo_ntohs, gre_hdr::ptype, osmo_sockaddr::sa, and osmo_sockaddr::u.

Referenced by handle_nsfrgre_read().

Variable Documentation

__attribute__

struct priv_bind __attribute__

flags

uint16_t flags

ptype

uint16_t ptype

vc_driver_frgre

struct gprs_ns2_vc_driver vc_driver_frgre

Initial value:

= {
        .name = "GB frame relay over GRE",
        .free_bind = free_bind,
}

Referenced by gprs_ns2_frgre_bind(), and gprs_ns2_is_frgre_bind().