| /* 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 <osmocom/sgsn/gb_proxy.h> |
| |
| #include <osmocom/sgsn/debug.h> |
| |
| #include <osmocom/gprs/protocol/gsm_08_18.h> |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/core/stats.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/gsm/tlv.h> |
| |
| #include <string.h> |
| |
| extern void *tall_sgsn_ctx; |
| |
| static const struct rate_ctr_desc bvc_ctr_description[] = { |
| { "blocked", "BVC Block " }, |
| { "unblocked", "BVC Unblock " }, |
| { "dropped", "BVC blocked, dropped packet " }, |
| { "inv-nsei", "NSEI mismatch " }, |
| { "tx-err", "NS Transmission error " }, |
| }; |
| |
| osmo_static_assert(ARRAY_SIZE(bvc_ctr_description) == GBPROX_PEER_CTR_LAST, everything_described); |
| |
| static const struct rate_ctr_group_desc bvc_ctrg_desc = { |
| .group_name_prefix = "gbproxy:peer", |
| .group_description = "GBProxy Peer Statistics", |
| .num_ctr = ARRAY_SIZE(bvc_ctr_description), |
| .ctr_desc = bvc_ctr_description, |
| .class_id = OSMO_STATS_CLASS_PEER, |
| }; |
| |
| |
| /* Find the gbproxy_bvc by its BVCI. There can only be one match */ |
| struct gbproxy_bvc *gbproxy_bvc_by_bvci(struct gbproxy_config *cfg, uint16_t bvci) |
| { |
| struct gbproxy_nse *nse; |
| int i; |
| |
| hash_for_each(cfg->bss_nses, i, nse, list) { |
| struct gbproxy_bvc *bvc; |
| hash_for_each_possible(nse->bvcs, bvc, list, bvci) { |
| if (bvc->bvci == bvci) |
| return bvc; |
| } |
| } |
| return NULL; |
| } |
| |
| /* Find the gbproxy_bvc by its NSEI */ |
| /* FIXME: Only returns the first bvc, but we could have multiple on this nsei */ |
| struct gbproxy_bvc *gbproxy_bvc_by_nsei(struct gbproxy_config *cfg, |
| uint16_t nsei) |
| { |
| struct gbproxy_nse *nse = gbproxy_nse_by_nsei(cfg, nsei); |
| struct gbproxy_bvc *bvc; |
| int i; |
| |
| if (!nse || hash_empty(nse->bvcs)) |
| return NULL; |
| |
| /* return the first entry we find */ |
| hash_for_each(nse->bvcs, i, bvc, list) |
| return bvc; |
| |
| return NULL; |
| } |
| |
| /* look-up a bvc by its Routeing Area Identification (RAI) */ |
| /* FIXME: this doesn't make sense, as RA can span multiple bvcs! */ |
| struct gbproxy_bvc *gbproxy_bvc_by_rai(struct gbproxy_config *cfg, |
| const uint8_t *ra) |
| { |
| struct gbproxy_nse *nse; |
| int i, j; |
| |
| hash_for_each(cfg->bss_nses, i, nse, list) { |
| struct gbproxy_bvc *bvc; |
| hash_for_each(nse->bvcs, j, bvc, list) { |
| if (!memcmp(bvc->ra, ra, 6)) |
| return bvc; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| struct gbproxy_bvc *gbproxy_bvc_alloc(struct gbproxy_nse *nse, uint16_t bvci) |
| { |
| struct gbproxy_bvc *bvc; |
| OSMO_ASSERT(nse); |
| struct gbproxy_config *cfg = nse->cfg; |
| OSMO_ASSERT(cfg); |
| |
| bvc = talloc_zero(tall_sgsn_ctx, struct gbproxy_bvc); |
| if (!bvc) |
| return NULL; |
| |
| bvc->bvci = bvci; |
| bvc->ctrg = rate_ctr_group_alloc(bvc, &bvc_ctrg_desc, bvci); |
| if (!bvc->ctrg) { |
| talloc_free(bvc); |
| return NULL; |
| } |
| bvc->nse = nse; |
| |
| hash_add(nse->bvcs, &bvc->list, bvc->bvci); |
| |
| return bvc; |
| } |
| |
| void gbproxy_bvc_free(struct gbproxy_bvc *bvc) |
| { |
| if (!bvc) |
| return; |
| |
| hash_del(&bvc->list); |
| |
| rate_ctr_group_free(bvc->ctrg); |
| bvc->ctrg = NULL; |
| |
| talloc_free(bvc); |
| } |
| |
| void gbproxy_bvc_move(struct gbproxy_bvc *bvc, struct gbproxy_nse *nse) |
| { |
| hash_del(&bvc->list); |
| hash_add(nse->bvcs, &bvc->list, bvc->bvci); |
| bvc->nse = nse; |
| } |
| |
| /*! remove bvcs (BVCs) on NSE specified by NSEI. |
| * \param[in] cfg proxy in which we operate |
| * \param[in] nsei NS entity in which we should clean up |
| * \param[in] bvci if 0: remove all BVCs; if != 0: BVCI of the single BVC to clean up */ |
| int gbproxy_cleanup_bvcs(struct gbproxy_config *cfg, uint16_t nsei, uint16_t bvci) |
| { |
| int i, j, counter = 0; |
| struct gbproxy_nse *nse; |
| struct hlist_node *ntmp; |
| OSMO_ASSERT(cfg); |
| |
| hash_for_each_safe(cfg->bss_nses, i, ntmp, nse, list) { |
| struct gbproxy_bvc *bvc; |
| struct hlist_node *btmp; |
| if (nse->nsei != nsei) |
| continue; |
| hash_for_each_safe(nse->bvcs, j, btmp, bvc, list) { |
| if (bvci && bvc->bvci != bvci) |
| continue; |
| |
| gbproxy_bvc_free(bvc); |
| counter += 1; |
| } |
| } |
| |
| return counter; |
| } |
| |
| struct gbproxy_nse *gbproxy_nse_alloc(struct gbproxy_config *cfg, uint16_t nsei) |
| { |
| struct gbproxy_nse *nse; |
| OSMO_ASSERT(cfg); |
| |
| nse = talloc_zero(tall_sgsn_ctx, struct gbproxy_nse); |
| if (!nse) |
| return NULL; |
| |
| nse->nsei = nsei; |
| nse->cfg = cfg; |
| |
| hash_add(cfg->bss_nses, &nse->list, nsei); |
| |
| hash_init(nse->bvcs); |
| |
| return nse; |
| } |
| |
| void gbproxy_nse_free(struct gbproxy_nse *nse) |
| { |
| struct gbproxy_bvc *bvc; |
| struct hlist_node *tmp; |
| int i; |
| |
| if (!nse) |
| return; |
| |
| hash_del(&nse->list); |
| |
| hash_for_each_safe(nse->bvcs, i, tmp, bvc, list) |
| gbproxy_bvc_free(bvc); |
| |
| talloc_free(nse); |
| } |
| |
| struct gbproxy_nse *gbproxy_nse_by_nsei(struct gbproxy_config *cfg, uint16_t nsei) |
| { |
| struct gbproxy_nse *nse; |
| OSMO_ASSERT(cfg); |
| |
| hash_for_each_possible(cfg->bss_nses, nse, list, nsei) { |
| if (nse->nsei == nsei) |
| return nse; |
| } |
| |
| return NULL; |
| } |
| |
| struct gbproxy_nse *gbproxy_nse_by_nsei_or_new(struct gbproxy_config *cfg, uint16_t nsei) |
| { |
| struct gbproxy_nse *nse; |
| OSMO_ASSERT(cfg); |
| |
| nse = gbproxy_nse_by_nsei(cfg, nsei); |
| if (!nse) |
| nse = gbproxy_nse_alloc(cfg, nsei); |
| |
| return nse; |
| } |