Pau Espin Pedrol | 05190c3 | 2023-01-05 20:13:13 +0100 | [diff] [blame] | 1 | /* PDP context functionality */ |
| 2 | |
| 3 | /* (C) 2009 by Harald Welte <laforge@gnumonks.org> |
| 4 | * |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation; either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU Affero General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <stdint.h> |
| 23 | |
| 24 | #include <osmocom/core/linuxlist.h> |
| 25 | #include <osmocom/core/talloc.h> |
| 26 | #include <osmocom/core/timer.h> |
| 27 | #include <osmocom/core/rate_ctr.h> |
| 28 | #include <osmocom/core/stats.h> |
| 29 | |
| 30 | #include <osmocom/sgsn/pdpctx.h> |
| 31 | #include <osmocom/sgsn/gprs_sgsn.h> |
| 32 | #include <osmocom/sgsn/sgsn.h> |
| 33 | #include <osmocom/sgsn/debug.h> |
| 34 | #include <osmocom/sgsn/signal.h> |
| 35 | #include <osmocom/sgsn/gtp_ggsn.h> |
| 36 | #include <osmocom/sgsn/gprs_llc_xid.h> |
| 37 | #include <osmocom/sgsn/gprs_sndcp.h> |
| 38 | #include <osmocom/sgsn/gprs_llc.h> |
| 39 | #include <osmocom/sgsn/gprs_sm.h> |
| 40 | #include <osmocom/sgsn/gtp.h> |
| 41 | |
Pau Espin Pedrol | 05190c3 | 2023-01-05 20:13:13 +0100 | [diff] [blame] | 42 | static const struct rate_ctr_desc pdpctx_ctr_description[] = { |
| 43 | { "udata:packets:in", "User Data Messages ( In)" }, |
| 44 | { "udata:packets:out", "User Data Messages (Out)" }, |
| 45 | { "udata:bytes:in", "User Data Bytes ( In)" }, |
| 46 | { "udata:bytes:out", "User Data Bytes (Out)" }, |
| 47 | }; |
| 48 | |
| 49 | static const struct rate_ctr_group_desc pdpctx_ctrg_desc = { |
| 50 | .group_name_prefix = "sgsn:pdpctx", |
| 51 | .group_description = "SGSN PDP Context Statistics", |
| 52 | .num_ctr = ARRAY_SIZE(pdpctx_ctr_description), |
| 53 | .ctr_desc = pdpctx_ctr_description, |
| 54 | .class_id = OSMO_STATS_CLASS_SUBSCRIBER, |
| 55 | }; |
| 56 | |
| 57 | /* you don't want to use this directly, call sgsn_create_pdp_ctx() */ |
| 58 | struct sgsn_pdp_ctx *sgsn_pdp_ctx_alloc(struct sgsn_mm_ctx *mm, |
| 59 | struct sgsn_ggsn_ctx *ggsn, |
| 60 | uint8_t nsapi) |
| 61 | { |
| 62 | struct sgsn_pdp_ctx *pdp; |
| 63 | |
| 64 | pdp = sgsn_pdp_ctx_by_nsapi(mm, nsapi); |
| 65 | if (pdp) |
| 66 | return NULL; |
| 67 | |
Pau Espin Pedrol | 15a52d9 | 2023-01-05 20:26:31 +0100 | [diff] [blame] | 68 | pdp = talloc_zero(sgsn, struct sgsn_pdp_ctx); |
Pau Espin Pedrol | 05190c3 | 2023-01-05 20:13:13 +0100 | [diff] [blame] | 69 | if (!pdp) |
| 70 | return NULL; |
| 71 | |
| 72 | pdp->mm = mm; |
| 73 | pdp->ggsn = ggsn; |
| 74 | pdp->nsapi = nsapi; |
| 75 | pdp->ctrg = rate_ctr_group_alloc(pdp, &pdpctx_ctrg_desc, nsapi); |
| 76 | if (!pdp->ctrg) { |
| 77 | LOGPDPCTXP(LOGL_ERROR, pdp, "Error allocation counter group\n"); |
| 78 | talloc_free(pdp); |
| 79 | return NULL; |
| 80 | } |
| 81 | llist_add(&pdp->list, &mm->pdp_list); |
| 82 | sgsn_ggsn_ctx_add_pdp(pdp->ggsn, pdp); |
Pau Espin Pedrol | 15a52d9 | 2023-01-05 20:26:31 +0100 | [diff] [blame] | 83 | llist_add(&pdp->g_list, &sgsn->pdp_list); |
Pau Espin Pedrol | 05190c3 | 2023-01-05 20:13:13 +0100 | [diff] [blame] | 84 | |
| 85 | return pdp; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * This function will not trigger any GSM DEACT PDP ACK messages, so you |
| 90 | * probably want to call sgsn_delete_pdp_ctx() instead if the connection |
| 91 | * isn't detached already. |
| 92 | */ |
| 93 | void sgsn_pdp_ctx_terminate(struct sgsn_pdp_ctx *pdp) |
| 94 | { |
| 95 | struct sgsn_signal_data sig_data; |
| 96 | |
| 97 | OSMO_ASSERT(pdp->mm != NULL); |
| 98 | |
| 99 | /* There might still be pending callbacks in libgtp. So the parts of |
| 100 | * this object relevant to GTP need to remain intact in this case. */ |
| 101 | |
| 102 | LOGPDPCTXP(LOGL_INFO, pdp, "Forcing release of PDP context\n"); |
| 103 | |
| 104 | if (pdp->mm->ran_type == MM_CTX_T_GERAN_Gb) { |
| 105 | /* Force the deactivation of the SNDCP layer */ |
| 106 | if (pdp->mm->gb.llme) |
| 107 | sndcp_sm_deactivate_ind(&pdp->mm->gb.llme->lle[pdp->sapi], pdp->nsapi); |
| 108 | } |
| 109 | |
| 110 | memset(&sig_data, 0, sizeof(sig_data)); |
| 111 | sig_data.pdp = pdp; |
| 112 | osmo_signal_dispatch(SS_SGSN, S_SGSN_PDP_TERMINATE, &sig_data); |
| 113 | |
| 114 | /* Detach from MM context */ |
| 115 | pdp_ctx_detach_mm_ctx(pdp); |
| 116 | if (pdp->ggsn) |
| 117 | sgsn_delete_pdp_ctx(pdp); |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * Don't call this function directly unless you know what you are doing. |
| 122 | * In normal conditions use sgsn_delete_pdp_ctx and in unspecified or |
| 123 | * implementation dependent abnormal ones sgsn_pdp_ctx_terminate. |
| 124 | */ |
| 125 | void sgsn_pdp_ctx_free(struct sgsn_pdp_ctx *pdp) |
| 126 | { |
| 127 | struct sgsn_signal_data sig_data; |
| 128 | |
| 129 | memset(&sig_data, 0, sizeof(sig_data)); |
| 130 | sig_data.pdp = pdp; |
| 131 | osmo_signal_dispatch(SS_SGSN, S_SGSN_PDP_FREE, &sig_data); |
| 132 | |
| 133 | if (osmo_timer_pending(&pdp->timer)) { |
| 134 | LOGPDPCTXP(LOGL_ERROR, pdp, "Freeing PDP ctx with timer %u pending\n", pdp->T); |
| 135 | osmo_timer_del(&pdp->timer); |
| 136 | } |
| 137 | |
| 138 | rate_ctr_group_free(pdp->ctrg); |
| 139 | if (pdp->mm) |
| 140 | llist_del(&pdp->list); |
| 141 | if (pdp->ggsn) |
| 142 | sgsn_ggsn_ctx_remove_pdp(pdp->ggsn, pdp); |
| 143 | llist_del(&pdp->g_list); |
| 144 | |
| 145 | /* _if_ we still have a library handle, at least set it to NULL |
| 146 | * to avoid any dereferences of the now-deleted PDP context from |
| 147 | * sgsn_libgtp:cb_data_ind() */ |
| 148 | if (pdp->lib) { |
| 149 | struct pdp_t *lib = pdp->lib; |
| 150 | LOGPDPCTXP(LOGL_NOTICE, pdp, "freeing PDP context that still " |
| 151 | "has a libgtp handle attached to it, this shouldn't " |
| 152 | "happen!\n"); |
| 153 | osmo_generate_backtrace(); |
| 154 | lib->priv = NULL; |
| 155 | } |
| 156 | |
| 157 | talloc_free(pdp); |
| 158 | } |