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/*! \file gprs_ns.h */
#pragma once
#include <stdint.h>
/* Our Implementation */
#include <netinet/in.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/select.h>
#include <osmocom/gprs/gprs_msgb.h>
#include <osmocom/gprs/protocol/gsm_08_16.h>
#define NS_TIMERS_COUNT 7
#define NS_TIMERS "(tns-block|tns-block-retries|tns-reset|tns-reset-retries|tns-test|tns-alive|tns-alive-retries)"
#define NS_TIMERS_HELP \
"(un)blocking Timer (Tns-block) timeout\n" \
"(un)blocking Timer (Tns-block) number of retries\n" \
"Reset Timer (Tns-reset) timeout\n" \
"Reset Timer (Tns-reset) number of retries\n" \
"Test Timer (Tns-test) timeout\n" \
"Alive Timer (Tns-alive) timeout\n" \
"Alive Timer (Tns-alive) number of retries\n"
/* Educated guess - LLC user payload is 1500 bytes plus possible headers */
#define NS_ALLOC_SIZE 3072
#define NS_ALLOC_HEADROOM 20
enum ns_timeout {
NS_TOUT_TNS_BLOCK,
NS_TOUT_TNS_BLOCK_RETRIES,
NS_TOUT_TNS_RESET,
NS_TOUT_TNS_RESET_RETRIES,
NS_TOUT_TNS_TEST,
NS_TOUT_TNS_ALIVE,
NS_TOUT_TNS_ALIVE_RETRIES,
};
#define NSE_S_BLOCKED 0x0001
#define NSE_S_ALIVE 0x0002
#define NSE_S_RESET 0x0004
#define NS_DESC_B(st) ((st) & NSE_S_BLOCKED ? "BLOCKED" : "UNBLOCKED")
#define NS_DESC_A(st) ((st) & NSE_S_ALIVE ? "ALIVE" : "DEAD")
#define NS_DESC_R(st) ((st) & NSE_S_RESET ? "RESET" : "UNRESET")
/*! Osmocom NS link layer types */
enum gprs_ns_ll {
GPRS_NS_LL_UDP, /*!< NS/UDP/IP */
GPRS_NS_LL_E1, /*!< NS/E1 */
GPRS_NS_LL_FR_GRE, /*!< NS/FR/GRE/IP */
};
/*! Osmoco NS events */
enum gprs_ns_evt {
GPRS_NS_EVT_UNIT_DATA,
};
/*! Osmocom NS VC create status */
enum gprs_ns_cs {
GPRS_NS_CS_CREATED, /*!< A NSVC object has been created */
GPRS_NS_CS_FOUND, /*!< A NSVC object has been found */
GPRS_NS_CS_REJECTED, /*!< Rejected and answered message */
GPRS_NS_CS_SKIPPED, /*!< Skipped message */
GPRS_NS_CS_ERROR, /*!< Failed to process message */
};
struct gprs_nsvc;
/*! Osmocom GPRS callback function type */
typedef int gprs_ns_cb_t(enum gprs_ns_evt event, struct gprs_nsvc *nsvc,
struct msgb *msg, uint16_t bvci);
/*! An instance of the NS protocol stack */
struct gprs_ns_inst {
/*! callback to the user for incoming UNIT DATA IND */
gprs_ns_cb_t *cb;
/*! linked lists of all NSVC in this instance */
struct llist_head gprs_nsvcs;
/*! a NSVC object that's needed to deal with packets for
* unknown NSVC */
struct gprs_nsvc *unknown_nsvc;
uint16_t timeout[NS_TIMERS_COUNT];
/*! NS-over-IP specific bits */
struct {
struct osmo_fd fd;
uint32_t local_ip;
uint16_t local_port;
uint32_t remote_ip;
uint16_t remote_port;
int dscp;
} nsip;
/*! NS-over-FR-over-GRE-over-IP specific bits */
struct {
struct osmo_fd fd;
uint32_t local_ip;
unsigned int enabled:1;
} frgre;
};
enum nsvc_timer_mode {
/* standard timers */
NSVC_TIMER_TNS_TEST,
NSVC_TIMER_TNS_ALIVE,
NSVC_TIMER_TNS_RESET,
_NSVC_TIMER_NR,
};
/*! Structure representing a single NS-VC */
struct gprs_nsvc {
/*! list of NS-VCs within NS Instance */
struct llist_head list;
/*! pointer to NS Instance */
struct gprs_ns_inst *nsi;
uint16_t nsei; /*! end-to-end significance */
uint16_t nsvci; /*! uniquely identifies NS-VC at SGSN */
uint32_t state;
uint32_t remote_state;
struct osmo_timer_list timer;
enum nsvc_timer_mode timer_mode;
struct timeval timer_started;
int alive_retries;
unsigned int remote_end_is_sgsn:1;
unsigned int persistent:1;
unsigned int nsvci_is_valid:1;
struct rate_ctr_group *ctrg;
struct osmo_stat_item_group *statg;
/*! which link-layer are we based on? */
enum gprs_ns_ll ll;
/*! make sure to always keep bts_addr as first struct member to not break the assumption
that those structs are similar */
union {
struct {
struct sockaddr_in bts_addr;
} ip;
struct {
struct sockaddr_in bts_addr;
} frgre;
};
};
/* Create a new NS protocol instance */
struct gprs_ns_inst *gprs_ns_instantiate(gprs_ns_cb_t *cb, void *ctx);
/* Close a NS protocol instance */
void gprs_ns_close(struct gprs_ns_inst *nsi);
/* Close and Destroy a NS protocol instance */
void gprs_ns_destroy(struct gprs_ns_inst *nsi);
/* Listen for incoming GPRS packets via NS/UDP */
int gprs_ns_nsip_listen(struct gprs_ns_inst *nsi);
/* Establish a connection (from the BSS) to the SGSN */
struct gprs_nsvc *gprs_ns_nsip_connect(struct gprs_ns_inst *nsi,
struct sockaddr_in *dest,
uint16_t nsei, uint16_t nsvci);
struct sockaddr_in;
/* main function for higher layers (BSSGP) to send NS messages */
int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg);
int gprs_ns_tx_reset(struct gprs_nsvc *nsvc, uint8_t cause);
int gprs_ns_tx_block(struct gprs_nsvc *nsvc, uint8_t cause);
int gprs_ns_tx_unblock(struct gprs_nsvc *nsvc);
/* Listen for incoming GPRS packets via NS/FR/GRE */
int gprs_ns_frgre_listen(struct gprs_ns_inst *nsi);
struct gprs_nsvc *gprs_nsvc_create(struct gprs_ns_inst *nsi, uint16_t nsvci);
void gprs_nsvc_delete(struct gprs_nsvc *nsvc);
struct gprs_nsvc *gprs_nsvc_by_nsei(struct gprs_ns_inst *nsi, uint16_t nsei);
struct gprs_nsvc *gprs_nsvc_by_nsvci(struct gprs_ns_inst *nsi, uint16_t nsvci);
/* Initiate a RESET procedure (including timer start, ...)*/
int gprs_nsvc_reset(struct gprs_nsvc *nsvc, uint8_t cause);
/* Add NS-specific VTY stuff */
int gprs_ns_vty_init(struct gprs_ns_inst *nsi);
/* Resturn peer info as string (NOTE: the buffer is allocated statically) */
const char *gprs_ns_ll_str(const struct gprs_nsvc *nsvc);
/* Copy the link layer info from other into nsvc */
void gprs_ns_ll_copy(struct gprs_nsvc *nsvc, struct gprs_nsvc *other);
/* Clear the link layer info (will never match a real link then) */
void gprs_ns_ll_clear(struct gprs_nsvc *nsvc);
struct msgb *gprs_ns_msgb_alloc(void);
enum signal_ns {
S_NS_RESET,
S_NS_BLOCK,
S_NS_UNBLOCK,
S_NS_ALIVE_EXP, /* Tns-alive expired more than N times */
S_NS_REPLACED, /* nsvc object is replaced (sets old_nsvc) */
S_NS_MISMATCH, /* got an unexpected IE (sets msg, pdu_type, ie_type) */
};
extern const struct value_string gprs_ns_signal_ns_names[];
struct ns_signal_data {
struct gprs_nsvc *nsvc;
struct gprs_nsvc *old_nsvc;
uint8_t cause;
uint8_t pdu_type;
uint8_t ie_type;
struct msgb *msg;
};
void gprs_ns_set_log_ss(int ss);
char *gprs_nsvc_state_append(char *s, struct gprs_nsvc *nsvc);
/*! @} */
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