diff options
Diffstat (limited to 'openbsc/src/gprs/gprs_sndcp_comp.c')
-rw-r--r-- | openbsc/src/gprs/gprs_sndcp_comp.c | 323 |
1 files changed, 0 insertions, 323 deletions
diff --git a/openbsc/src/gprs/gprs_sndcp_comp.c b/openbsc/src/gprs/gprs_sndcp_comp.c deleted file mode 100644 index a12c39aa6..000000000 --- a/openbsc/src/gprs/gprs_sndcp_comp.c +++ /dev/null @@ -1,323 +0,0 @@ -/* GPRS SNDCP header compression entity management tools */ - -/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> - * All Rights Reserved - * - * Author: Philipp Maier - * - * 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 <stdio.h> -#include <string.h> -#include <stdint.h> -#include <math.h> -#include <errno.h> -#include <stdbool.h> - -#include <osmocom/core/linuxlist.h> -#include <osmocom/core/talloc.h> -#include <osmocom/core/utils.h> - -#include <openbsc/debug.h> -#include <openbsc/gprs_sndcp_xid.h> -#include <openbsc/gprs_sndcp_comp.h> -#include <openbsc/gprs_sndcp_pcomp.h> -#include <openbsc/gprs_sndcp_dcomp.h> - -/* Create a new compression entity from a XID-Field */ -static struct gprs_sndcp_comp *gprs_sndcp_comp_create(const void *ctx, - const struct - gprs_sndcp_comp_field - *comp_field) -{ - struct gprs_sndcp_comp *comp_entity; - comp_entity = talloc_zero(ctx, struct gprs_sndcp_comp); - - /* Copy relevant information from the SNDCP-XID field */ - comp_entity->entity = comp_field->entity; - comp_entity->comp_len = comp_field->comp_len; - memcpy(comp_entity->comp, comp_field->comp, sizeof(comp_entity->comp)); - - if (comp_field->rfc1144_params) { - comp_entity->nsapi_len = comp_field->rfc1144_params->nsapi_len; - memcpy(comp_entity->nsapi, - comp_field->rfc1144_params->nsapi, - sizeof(comp_entity->nsapi)); - } else if (comp_field->rfc2507_params) { - comp_entity->nsapi_len = comp_field->rfc2507_params->nsapi_len; - memcpy(comp_entity->nsapi, - comp_field->rfc2507_params->nsapi, - sizeof(comp_entity->nsapi)); - } else if (comp_field->rohc_params) { - comp_entity->nsapi_len = comp_field->rohc_params->nsapi_len; - memcpy(comp_entity->nsapi, comp_field->rohc_params->nsapi, - sizeof(comp_entity->nsapi)); - } else if (comp_field->v42bis_params) { - comp_entity->nsapi_len = comp_field->v42bis_params->nsapi_len; - memcpy(comp_entity->nsapi, - comp_field->v42bis_params->nsapi, - sizeof(comp_entity->nsapi)); - } else if (comp_field->v44_params) { - comp_entity->nsapi_len = comp_field->v44_params->nsapi_len; - memcpy(comp_entity->nsapi, - comp_field->v44_params->nsapi, - sizeof(comp_entity->nsapi)); - } else { - /* The caller is expected to check carefully if the all - * data fields required for compression entity creation - * are present. Otherwise we blow an assertion here */ - OSMO_ASSERT(false); - } - comp_entity->algo = comp_field->algo; - - /* Check if an NSAPI is selected, if not, it does not make sense - * to create the compression entity, since the caller should - * have checked the presence of the NSAPI, we blow an assertion - * in case of missing NSAPIs */ - OSMO_ASSERT(comp_entity->nsapi_len > 0); - - /* Determine of which class our compression entity will be - * (Protocol or Data compresson ?) */ - comp_entity->compclass = gprs_sndcp_get_compression_class(comp_field); - - OSMO_ASSERT(comp_entity->compclass != -1); - - /* Create an algorithm specific compression context */ - if (comp_entity->compclass == SNDCP_XID_PROTOCOL_COMPRESSION) { - if (gprs_sndcp_pcomp_init(ctx, comp_entity, comp_field) != 0) { - talloc_free(comp_entity); - comp_entity = NULL; - } - } else { - if (gprs_sndcp_dcomp_init(ctx, comp_entity, comp_field) != 0) { - talloc_free(comp_entity); - comp_entity = NULL; - } - } - - /* Bail on failure */ - if (comp_entity == NULL) { - LOGP(DSNDCP, LOGL_ERROR, - "Compression entity creation failed!\n"); - return NULL; - } - - /* Display info message */ - if (comp_entity->compclass == SNDCP_XID_PROTOCOL_COMPRESSION) { - LOGP(DSNDCP, LOGL_INFO, - "New header compression entity (%d) created.\n", - comp_entity->entity); - } else { - LOGP(DSNDCP, LOGL_INFO, - "New data compression entity (%d) created.\n", - comp_entity->entity); - } - - return comp_entity; -} - -/* Allocate a compression enitiy list */ -struct llist_head *gprs_sndcp_comp_alloc(const void *ctx) -{ - struct llist_head *lh; - - lh = talloc_zero(ctx, struct llist_head); - INIT_LLIST_HEAD(lh); - - return lh; -} - -/* Free a compression entitiy list */ -void gprs_sndcp_comp_free(struct llist_head *comp_entities) -{ - struct gprs_sndcp_comp *comp_entity; - - /* We expect the caller to take care of allocating a - * compression entity list properly. Attempting to - * free a non existing list clearly points out - * a malfunction. */ - OSMO_ASSERT(comp_entities); - - llist_for_each_entry(comp_entity, comp_entities, list) { - /* Free compression entity */ - if (comp_entity->compclass == SNDCP_XID_PROTOCOL_COMPRESSION) { - LOGP(DSNDCP, LOGL_INFO, - "Deleting header compression entity %d ...\n", - comp_entity->entity); - gprs_sndcp_pcomp_term(comp_entity); - } else { - LOGP(DSNDCP, LOGL_INFO, - "Deleting data compression entity %d ...\n", - comp_entity->entity); - gprs_sndcp_dcomp_term(comp_entity); - } - } - - talloc_free(comp_entities); -} - -/* Delete a compression entity */ -void gprs_sndcp_comp_delete(struct llist_head *comp_entities, - unsigned int entity) -{ - struct gprs_sndcp_comp *comp_entity; - struct gprs_sndcp_comp *comp_entity_to_delete = NULL; - - OSMO_ASSERT(comp_entities); - - llist_for_each_entry(comp_entity, comp_entities, list) { - if (comp_entity->entity == entity) { - comp_entity_to_delete = comp_entity; - break; - } - } - - if (!comp_entity_to_delete) - return; - - if (comp_entity_to_delete->compclass == SNDCP_XID_PROTOCOL_COMPRESSION) { - LOGP(DSNDCP, LOGL_INFO, - "Deleting header compression entity %d ...\n", - comp_entity_to_delete->entity); - gprs_sndcp_pcomp_term(comp_entity_to_delete); - } else { - LOGP(DSNDCP, LOGL_INFO, - "Deleting data compression entity %d ...\n", - comp_entity_to_delete->entity); - } - - /* Delete compression entity */ - llist_del(&comp_entity_to_delete->list); - talloc_free(comp_entity_to_delete); -} - -/* Create and Add a new compression entity - * (returns a pointer to the compression entity that has just been created) */ -struct gprs_sndcp_comp *gprs_sndcp_comp_add(const void *ctx, - struct llist_head *comp_entities, - const struct gprs_sndcp_comp_field - *comp_field) -{ - struct gprs_sndcp_comp *comp_entity; - - OSMO_ASSERT(comp_entities); - OSMO_ASSERT(comp_field); - - /* Just to be sure, if the entity is already in - * the list it will be deleted now */ - gprs_sndcp_comp_delete(comp_entities, comp_field->entity); - - /* Create and add a new entity to the list */ - comp_entity = gprs_sndcp_comp_create(ctx, comp_field); - - if (!comp_entity) - return NULL; - - llist_add(&comp_entity->list, comp_entities); - return comp_entity; -} - -/* Find which compression entity handles the specified pcomp/dcomp */ -struct gprs_sndcp_comp *gprs_sndcp_comp_by_comp(const struct llist_head - *comp_entities, uint8_t comp) -{ - struct gprs_sndcp_comp *comp_entity; - int i; - - OSMO_ASSERT(comp_entities); - - llist_for_each_entry(comp_entity, comp_entities, list) { - for (i = 0; i < comp_entity->comp_len; i++) { - if (comp_entity->comp[i] == comp) - return comp_entity; - } - } - - LOGP(DSNDCP, LOGL_ERROR, - "Could not find a matching compression entity for given pcomp/dcomp value %d.\n", - comp); - return NULL; -} - -/* Find which compression entity handles the specified nsapi */ -struct gprs_sndcp_comp *gprs_sndcp_comp_by_nsapi(const struct llist_head - *comp_entities, uint8_t nsapi) -{ - struct gprs_sndcp_comp *comp_entity; - int i; - - OSMO_ASSERT(comp_entities); - - llist_for_each_entry(comp_entity, comp_entities, list) { - for (i = 0; i < comp_entity->nsapi_len; i++) { - if (comp_entity->nsapi[i] == nsapi) - return comp_entity; - } - } - - return NULL; -} - -/* Find a comp_index for a given pcomp/dcomp value */ -uint8_t gprs_sndcp_comp_get_idx(const struct gprs_sndcp_comp *comp_entity, - uint8_t comp) -{ - /* Note: This function returns a normalized version of the comp value, - * which matches up with the position of the comp field. Since comp=0 - * is reserved for "no compression", the index value starts counting - * at one. The return value is the PCOMPn/DCOMPn value one can find - * in the Specification (see e.g. 3GPP TS 44.065, 6.5.3.2, Table 7) */ - - int i; - OSMO_ASSERT(comp_entity); - - /* A pcomp/dcomp value of zero is reserved for "no comproession", - * So we just bail and return zero in this case */ - if (comp == 0) - return 0; - - /* Look in the pcomp/dcomp list for the index */ - for (i = 0; i < comp_entity->comp_len; i++) { - if (comp_entity->comp[i] == comp) - return i + 1; - } - - LOGP(DSNDCP, LOGL_ERROR, - "Could not find a matching comp_index for given pcomp/dcomp value %d\n", - comp); - return 0; -} - -/* Find a pcomp/dcomp value for a given comp_index */ -uint8_t gprs_sndcp_comp_get_comp(const struct gprs_sndcp_comp *comp_entity, - uint8_t comp_index) -{ - OSMO_ASSERT(comp_entity); - - /* A comp_index of zero translates to zero right away. */ - if (comp_index == 0) - return 0; - - if (comp_index > comp_entity->comp_len) { - LOGP(DSNDCP, LOGL_ERROR, - "Could not find a matching pcomp/dcomp value for given comp_index value %d.\n", - comp_index); - return 0; - } - - /* Look in the pcomp/dcomp list for the comp_index, see - * note in gprs_sndcp_comp_get_idx() */ - return comp_entity->comp[comp_index - 1]; -} |