summaryrefslogtreecommitdiffstats
path: root/openbsc/src/gprs/gb_proxy_peer.c
blob: c2cdd0e67791df51b49adfa1304100e2e5ec97c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
/* Gb proxy peer handling */

/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
 * (C) 2010-2013 by On-Waves
 * (C) 2013 by Holger Hans Peter Freyther
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <openbsc/gb_proxy.h>

#include <openbsc/gsm_data.h>
#include <openbsc/gsm_data_shared.h>
#include <openbsc/gsm_04_08_gprs.h>
#include <openbsc/debug.h>

#include <osmocom/gprs/protocol/gsm_08_18.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/core/stats.h>
#include <osmocom/core/talloc.h>

#include <string.h>

static const struct rate_ctr_desc peer_ctr_description[] = {
	{ "blocked",	   "BVC Block                       " },
	{ "unblocked",	   "BVC Unblock                     " },
	{ "dropped",	   "BVC blocked, dropped packet     " },
	{ "inv-nsei",	   "NSEI mismatch                   " },
	{ "tx-err",	   "NS Transmission error           " },
	{ "raid-mod.bss",  "RAID patched              (BSS )" },
	{ "raid-mod.sgsn", "RAID patched              (SGSN)" },
	{ "apn-mod.sgsn",  "APN patched                     " },
	{ "tlli-mod.bss",  "TLLI patched              (BSS )" },
	{ "tlli-mod.sgsn", "TLLI patched              (SGSN)" },
	{ "ptmsi-mod.bss", "P-TMSI patched            (BSS )" },
	{ "ptmsi-mod.sgsn","P-TMSI patched            (SGSN)" },
	{ "mod-crypt-err", "Patch error: encrypted          " },
	{ "mod-err",	   "Patch error: other              " },
	{ "attach-reqs",   "Attach Request count            " },
	{ "attach-rejs",   "Attach Reject count             " },
	{ "attach-acks",   "Attach Accept count             " },
	{ "attach-cpls",   "Attach Completed count          " },
	{ "ra-upd-reqs",   "RoutingArea Update Request count" },
	{ "ra-upd-rejs",   "RoutingArea Update Reject count " },
	{ "ra-upd-acks",   "RoutingArea Update Accept count " },
	{ "ra-upd-cpls",   "RoutingArea Update Compltd count" },
	{ "gmm-status",    "GMM Status count           (BSS)" },
	{ "gmm-status",    "GMM Status count          (SGSN)" },
	{ "detach-reqs",   "Detach Request count            " },
	{ "detach-acks",   "Detach Accept count             " },
	{ "pdp-act-reqs",  "PDP Activation Request count    " },
	{ "pdp-act-rejs",  "PDP Activation Reject count     " },
	{ "pdp-act-acks",  "PDP Activation Accept count     " },
	{ "pdp-deact-reqs","PDP Deactivation Request count  " },
	{ "pdp-deact-acks","PDP Deactivation Accept count   " },
	{ "tlli-unknown",  "TLLI from SGSN unknown          " },
	{ "tlli-cache",    "TLLI cache size                 " },
};

osmo_static_assert(ARRAY_SIZE(peer_ctr_description) == GBPROX_PEER_CTR_LAST, everything_described);

static const struct rate_ctr_group_desc peer_ctrg_desc = {
	.group_name_prefix = "gbproxy.peer",
	.group_description = "GBProxy Peer Statistics",
	.num_ctr = ARRAY_SIZE(peer_ctr_description),
	.ctr_desc = peer_ctr_description,
	.class_id = OSMO_STATS_CLASS_PEER,
};


/* Find the gbprox_peer by its BVCI */
struct gbproxy_peer *gbproxy_peer_by_bvci(struct gbproxy_config *cfg, uint16_t bvci)
{
	struct gbproxy_peer *peer;
	llist_for_each_entry(peer, &cfg->bts_peers, list) {
		if (peer->bvci == bvci)
			return peer;
	}
	return NULL;
}

/* Find the gbprox_peer by its NSEI */
struct gbproxy_peer *gbproxy_peer_by_nsei(struct gbproxy_config *cfg,
					  uint16_t nsei)
{
	struct gbproxy_peer *peer;
	llist_for_each_entry(peer, &cfg->bts_peers, list) {
		if (peer->nsei == nsei)
			return peer;
	}
	return NULL;
}

/* look-up a peer by its Routeing Area Identification (RAI) */
struct gbproxy_peer *gbproxy_peer_by_rai(struct gbproxy_config *cfg,
					 const uint8_t *ra)
{
	struct gbproxy_peer *peer;
	llist_for_each_entry(peer, &cfg->bts_peers, list) {
		if (!memcmp(peer->ra, ra, 6))
			return peer;
	}
	return NULL;
}

/* look-up a peer by its Location Area Identification (LAI) */
struct gbproxy_peer *gbproxy_peer_by_lai(struct gbproxy_config *cfg,
					 const uint8_t *la)
{
	struct gbproxy_peer *peer;
	llist_for_each_entry(peer, &cfg->bts_peers, list) {
		if (!memcmp(peer->ra, la, 5))
			return peer;
	}
	return NULL;
}

/* look-up a peer by its Location Area Code (LAC) */
struct gbproxy_peer *gbproxy_peer_by_lac(struct gbproxy_config *cfg,
					 const uint8_t *la)
{
	struct gbproxy_peer *peer;
	llist_for_each_entry(peer, &cfg->bts_peers, list) {
		if (!memcmp(peer->ra + 3, la + 3, 2))
			return peer;
	}
	return NULL;
}

struct gbproxy_peer *gbproxy_peer_by_bssgp_tlv(struct gbproxy_config *cfg,
					       struct tlv_parsed *tp)
{
	if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) {
		uint16_t bvci;

		bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI));
		if (bvci >= 2)
			return gbproxy_peer_by_bvci(cfg, bvci);
	}

	if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) {
		uint8_t *rai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA);
		/* Only compare LAC part, since MCC/MNC are possibly patched.
		 * Since the LAC of different BSS must be different when
		 * MCC/MNC are patched, collisions shouldn't happen. */
		return gbproxy_peer_by_lac(cfg, rai);
	}

	if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) {
		uint8_t *lai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA);
		return gbproxy_peer_by_lac(cfg, lai);
	}

	return NULL;
}


struct gbproxy_peer *gbproxy_peer_alloc(struct gbproxy_config *cfg, uint16_t bvci)
{
	struct gbproxy_peer *peer;

	peer = talloc_zero(tall_bsc_ctx, struct gbproxy_peer);
	if (!peer)
		return NULL;

	peer->bvci = bvci;
	peer->ctrg = rate_ctr_group_alloc(peer, &peer_ctrg_desc, bvci);
	peer->cfg = cfg;

	llist_add(&peer->list, &cfg->bts_peers);

	INIT_LLIST_HEAD(&peer->patch_state.logical_links);

	return peer;
}

void gbproxy_peer_free(struct gbproxy_peer *peer)
{
	llist_del(&peer->list);

	gbproxy_delete_link_infos(peer);

	rate_ctr_group_free(peer->ctrg);
	peer->ctrg = NULL;

	talloc_free(peer);
}

int gbproxy_cleanup_peers(struct gbproxy_config *cfg, uint16_t nsei, uint16_t bvci)
{
	int counter = 0;
	struct gbproxy_peer *peer, *tmp;

	llist_for_each_entry_safe(peer, tmp, &cfg->bts_peers, list) {
		if (peer->nsei != nsei)
			continue;
		if (bvci && peer->bvci != bvci)
			continue;

		gbproxy_peer_free(peer);
		counter += 1;
	}

	return counter;
}