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-rw-r--r--include/osmocom/sgsn/gb_proxy.h288
1 files changed, 288 insertions, 0 deletions
diff --git a/include/osmocom/sgsn/gb_proxy.h b/include/osmocom/sgsn/gb_proxy.h
new file mode 100644
index 00000000..e10894fc
--- /dev/null
+++ b/include/osmocom/sgsn/gb_proxy.h
@@ -0,0 +1,288 @@
+#ifndef _GB_PROXY_H
+#define _GB_PROXY_H
+
+
+#include <osmocom/core/msgb.h>
+
+#include <osmocom/gprs/gprs_ns.h>
+#include <osmocom/vty/command.h>
+
+#include <sys/types.h>
+#include <regex.h>
+
+#define GBPROXY_INIT_VU_GEN_TX 256
+
+struct rate_ctr_group;
+struct gprs_gb_parse_context;
+struct tlv_parsed;
+
+enum gbproxy_global_ctr {
+ GBPROX_GLOB_CTR_INV_BVCI,
+ GBPROX_GLOB_CTR_INV_LAI,
+ GBPROX_GLOB_CTR_INV_RAI,
+ GBPROX_GLOB_CTR_INV_NSEI,
+ GBPROX_GLOB_CTR_PROTO_ERR_BSS,
+ GBPROX_GLOB_CTR_PROTO_ERR_SGSN,
+ GBPROX_GLOB_CTR_NOT_SUPPORTED_BSS,
+ GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN,
+ GBPROX_GLOB_CTR_RESTART_RESET_SGSN,
+ GBPROX_GLOB_CTR_TX_ERR_SGSN,
+ GBPROX_GLOB_CTR_OTHER_ERR,
+ GBPROX_GLOB_CTR_PATCH_PEER_ERR,
+};
+
+enum gbproxy_peer_ctr {
+ GBPROX_PEER_CTR_BLOCKED,
+ GBPROX_PEER_CTR_UNBLOCKED,
+ GBPROX_PEER_CTR_DROPPED,
+ GBPROX_PEER_CTR_INV_NSEI,
+ GBPROX_PEER_CTR_TX_ERR,
+ GBPROX_PEER_CTR_RAID_PATCHED_BSS,
+ GBPROX_PEER_CTR_RAID_PATCHED_SGSN,
+ GBPROX_PEER_CTR_APN_PATCHED,
+ GBPROX_PEER_CTR_TLLI_PATCHED_BSS,
+ GBPROX_PEER_CTR_TLLI_PATCHED_SGSN,
+ GBPROX_PEER_CTR_PTMSI_PATCHED_BSS,
+ GBPROX_PEER_CTR_PTMSI_PATCHED_SGSN,
+ GBPROX_PEER_CTR_PATCH_CRYPT_ERR,
+ GBPROX_PEER_CTR_PATCH_ERR,
+ GBPROX_PEER_CTR_ATTACH_REQS,
+ GBPROX_PEER_CTR_ATTACH_REJS,
+ GBPROX_PEER_CTR_ATTACH_ACKS,
+ GBPROX_PEER_CTR_ATTACH_COMPLS,
+ GBPROX_PEER_CTR_RA_UPD_REQS,
+ GBPROX_PEER_CTR_RA_UPD_REJS,
+ GBPROX_PEER_CTR_RA_UPD_ACKS,
+ GBPROX_PEER_CTR_RA_UPD_COMPLS,
+ GBPROX_PEER_CTR_GMM_STATUS_BSS,
+ GBPROX_PEER_CTR_GMM_STATUS_SGSN,
+ GBPROX_PEER_CTR_DETACH_REQS,
+ GBPROX_PEER_CTR_DETACH_ACKS,
+ GBPROX_PEER_CTR_PDP_ACT_REQS,
+ GBPROX_PEER_CTR_PDP_ACT_REJS,
+ GBPROX_PEER_CTR_PDP_ACT_ACKS,
+ GBPROX_PEER_CTR_PDP_DEACT_REQS,
+ GBPROX_PEER_CTR_PDP_DEACT_ACKS,
+ GBPROX_PEER_CTR_TLLI_UNKNOWN,
+ GBPROX_PEER_CTR_TLLI_CACHE_SIZE,
+ GBPROX_PEER_CTR_LAST,
+};
+
+enum gbproxy_keep_mode {
+ GBPROX_KEEP_NEVER,
+ GBPROX_KEEP_REATTACH,
+ GBPROX_KEEP_IDENTIFIED,
+ GBPROX_KEEP_ALWAYS,
+};
+
+enum gbproxy_match_id {
+ GBPROX_MATCH_PATCHING,
+ GBPROX_MATCH_ROUTING,
+ GBPROX_MATCH_LAST
+};
+
+struct gbproxy_match {
+ int enable;
+ char *re_str;
+ regex_t re_comp;
+};
+
+struct gbproxy_config {
+ /* parsed from config file */
+ uint16_t nsip_sgsn_nsei;
+
+ /* misc */
+ struct gprs_ns_inst *nsi;
+
+ /* Linked list of all Gb peers (except SGSN) */
+ struct llist_head bts_peers;
+
+ /* Counter */
+ struct rate_ctr_group *ctrg;
+
+ /* force mcc/mnc */
+ int core_mnc;
+ int core_mcc;
+ uint8_t* core_apn;
+ size_t core_apn_size;
+ int tlli_max_age;
+ int tlli_max_len;
+
+ /* Experimental config */
+ int patch_ptmsi;
+ int acquire_imsi;
+ int route_to_sgsn2;
+ uint16_t nsip_sgsn2_nsei;
+ enum gbproxy_keep_mode keep_link_infos;
+
+ /* IMSI checking/matching */
+ struct gbproxy_match matches[GBPROX_MATCH_LAST];
+};
+
+struct gbproxy_patch_state {
+ int local_mnc;
+ int local_mcc;
+
+ /* List of TLLIs for which patching is enabled */
+ struct llist_head logical_links;
+ int logical_link_count;
+};
+
+struct gbproxy_peer {
+ struct llist_head list;
+
+ /* point back to the config */
+ struct gbproxy_config *cfg;
+
+ /* NSEI of the peer entity */
+ uint16_t nsei;
+
+ /* BVCI used for Point-to-Point to this peer */
+ uint16_t bvci;
+ int blocked;
+
+ /* Routeing Area that this peer is part of (raw 04.08 encoding) */
+ uint8_t ra[6];
+
+ /* Counter */
+ struct rate_ctr_group *ctrg;
+
+ struct gbproxy_patch_state patch_state;
+};
+
+struct gbproxy_tlli_state {
+ uint32_t current;
+ uint32_t assigned;
+ int bss_validated;
+ int net_validated;
+
+ uint32_t ptmsi;
+};
+
+struct gbproxy_link_info {
+ struct llist_head list;
+
+ struct gbproxy_tlli_state tlli;
+ struct gbproxy_tlli_state sgsn_tlli;
+ uint32_t sgsn_nsei;
+
+ time_t timestamp;
+ uint8_t *imsi;
+ size_t imsi_len;
+
+ int imsi_acq_pending;
+ struct llist_head stored_msgs;
+ unsigned vu_gen_tx_bss;
+
+ int is_deregistered;
+
+ int is_matching[GBPROX_MATCH_LAST];
+};
+
+
+/* gb_proxy_vty .c */
+
+int gbproxy_vty_init(void);
+int gbproxy_parse_config(const char *config_file, struct gbproxy_config *cfg);
+
+
+/* gb_proxy.c */
+int gbproxy_init_config(struct gbproxy_config *cfg);
+
+/* Main input function for Gb proxy */
+int gbprox_rcvmsg(struct gbproxy_config *cfg, struct msgb *msg, uint16_t nsei, uint16_t ns_bvci, uint16_t nsvci);
+
+int gbprox_signal(unsigned int subsys, unsigned int signal,
+ void *handler_data, void *signal_data);
+
+/* Reset all persistent NS-VC's */
+int gbprox_reset_persistent_nsvcs(struct gprs_ns_inst *nsi);
+
+void gbprox_reset(struct gbproxy_config *cfg);
+
+/* TLLI info handling */
+void gbproxy_delete_link_infos(struct gbproxy_peer *peer);
+struct gbproxy_link_info *gbproxy_update_link_state_ul(
+ struct gbproxy_peer *peer, time_t now,
+ struct gprs_gb_parse_context *parse_ctx);
+struct gbproxy_link_info *gbproxy_update_link_state_dl(
+ struct gbproxy_peer *peer, time_t now,
+ struct gprs_gb_parse_context *parse_ctx);
+int gbproxy_update_link_state_after(
+ struct gbproxy_peer *peer, struct gbproxy_link_info *link_info,
+ time_t now, struct gprs_gb_parse_context *parse_ctx);
+int gbproxy_remove_stale_link_infos(struct gbproxy_peer *peer, time_t now);
+void gbproxy_delete_link_info(struct gbproxy_peer *peer,
+ struct gbproxy_link_info *link_info);
+void gbproxy_link_info_discard_messages(struct gbproxy_link_info *link_info);
+
+void gbproxy_attach_link_info(struct gbproxy_peer *peer, time_t now,
+ struct gbproxy_link_info *link_info);
+void gbproxy_update_link_info(struct gbproxy_link_info *link_info,
+ const uint8_t *imsi, size_t imsi_len);
+void gbproxy_detach_link_info(struct gbproxy_peer *peer,
+ struct gbproxy_link_info *link_info);
+struct gbproxy_link_info *gbproxy_link_info_alloc( struct gbproxy_peer *peer);
+
+struct gbproxy_link_info *gbproxy_link_info_by_tlli(
+ struct gbproxy_peer *peer, uint32_t tlli);
+struct gbproxy_link_info *gbproxy_link_info_by_imsi(
+ struct gbproxy_peer *peer, const uint8_t *imsi, size_t imsi_len);
+struct gbproxy_link_info *gbproxy_link_info_by_any_sgsn_tlli(
+ struct gbproxy_peer *peer, uint32_t tlli);
+struct gbproxy_link_info *gbproxy_link_info_by_sgsn_tlli(
+ struct gbproxy_peer *peer,
+ uint32_t tlli, uint32_t sgsn_nsei);
+struct gbproxy_link_info *gbproxy_link_info_by_ptmsi(
+ struct gbproxy_peer *peer,
+ uint32_t ptmsi);
+
+int gbproxy_imsi_matches(
+ struct gbproxy_config *cfg,
+ enum gbproxy_match_id match_id,
+ struct gbproxy_link_info *link_info);
+uint32_t gbproxy_map_tlli(
+ uint32_t other_tlli, struct gbproxy_link_info *link_info, int to_bss);
+
+/* needed by gb_proxy_tlli.h */
+uint32_t gbproxy_make_bss_ptmsi(struct gbproxy_peer *peer, uint32_t sgsn_ptmsi);
+uint32_t gbproxy_make_sgsn_tlli(
+ struct gbproxy_peer *peer, struct gbproxy_link_info *link_info,
+ uint32_t bss_tlli);
+void gbproxy_reset_link(struct gbproxy_link_info *link_info);
+int gbproxy_check_imsi(
+ struct gbproxy_match *match, const uint8_t *imsi, size_t imsi_len);
+
+/* Message patching */
+void gbproxy_patch_bssgp(
+ struct msgb *msg, uint8_t *bssgp, size_t bssgp_len,
+ struct gbproxy_peer *peer, struct gbproxy_link_info *link_info,
+ int *len_change, struct gprs_gb_parse_context *parse_ctx);
+
+int gbproxy_patch_llc(
+ struct msgb *msg, uint8_t *llc, size_t llc_len,
+ struct gbproxy_peer *peer, struct gbproxy_link_info *link_info,
+ int *len_change, struct gprs_gb_parse_context *parse_ctx);
+
+int gbproxy_set_patch_filter(
+ struct gbproxy_match *match, const char *filter, const char **err_msg);
+void gbproxy_clear_patch_filter(struct gbproxy_match *match);
+
+/* Peer handling */
+struct gbproxy_peer *gbproxy_peer_by_bvci(
+ struct gbproxy_config *cfg, uint16_t bvci);
+struct gbproxy_peer *gbproxy_peer_by_nsei(
+ struct gbproxy_config *cfg, uint16_t nsei);
+struct gbproxy_peer *gbproxy_peer_by_rai(
+ struct gbproxy_config *cfg, const uint8_t *ra);
+struct gbproxy_peer *gbproxy_peer_by_lai(
+ struct gbproxy_config *cfg, const uint8_t *la);
+struct gbproxy_peer *gbproxy_peer_by_lac(
+ struct gbproxy_config *cfg, const uint8_t *la);
+struct gbproxy_peer *gbproxy_peer_by_bssgp_tlv(
+ struct gbproxy_config *cfg, struct tlv_parsed *tp);
+struct gbproxy_peer *gbproxy_peer_alloc(struct gbproxy_config *cfg, uint16_t bvci);
+void gbproxy_peer_free(struct gbproxy_peer *peer);
+int gbproxy_cleanup_peers(struct gbproxy_config *cfg, uint16_t nsei, uint16_t bvci);
+
+#endif