2010-07-27 19:32:52 +00:00
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/* MTP layer3 main handling code */
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/*
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <mtp_data.h>
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#include <mtp_level3.h>
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2010-07-30 21:25:35 +00:00
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#include <cellmgr_debug.h>
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2010-07-27 19:32:52 +00:00
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2010-07-30 21:25:35 +00:00
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#include <osmocore/talloc.h>
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2010-07-27 19:32:52 +00:00
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2010-08-04 10:39:26 +00:00
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#include <osmocom/sccp/sccp.h>
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2010-07-27 19:32:52 +00:00
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#include <arpa/inet.h>
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#include <string.h>
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static void *tall_mtp_ctx = NULL;
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static struct msgb *mtp_msg_alloc(struct mtp_link *link)
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{
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struct mtp_level_3_hdr *hdr;
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struct msgb *msg = msgb_alloc_headroom(4096, 128, "mtp-msg");
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if (!msg) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate mtp msg\n");
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return NULL;
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}
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msg->l2h = msgb_put(msg, sizeof(*hdr));
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hdr = (struct mtp_level_3_hdr *) msg->l2h;
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hdr->addr = MTP_ADDR(0x0, link->dpc, link->opc);
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2010-11-26 20:01:58 +00:00
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hdr->ni = MTP_NI_NATION_NET;
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2010-07-27 19:32:52 +00:00
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return msg;
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}
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static struct msgb *mtp_create_sltm(struct mtp_link *link)
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{
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2010-07-30 20:37:26 +00:00
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const uint8_t test_ptrn[14] = { 'G', 'S', 'M', 'M', 'M', 'S', };
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2010-07-27 19:32:52 +00:00
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struct mtp_level_3_hdr *hdr;
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struct mtp_level_3_mng *mng;
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struct msgb *msg = mtp_msg_alloc(link);
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2010-07-30 20:37:26 +00:00
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uint8_t *data;
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2010-07-27 19:32:52 +00:00
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if (!msg)
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return NULL;
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hdr = (struct mtp_level_3_hdr *) msg->l2h;
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hdr->ser_ind = MTP_SI_MNT_REG_MSG;
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mng = (struct mtp_level_3_mng *) msgb_put(msg, sizeof(*mng));
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mng->cmn.h0 = MTP_TST_MSG_GRP;
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mng->cmn.h1 = MTP_TST_MSG_SLTM;
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mng->length = ARRAY_SIZE(test_ptrn);
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data = msgb_put(msg, ARRAY_SIZE(test_ptrn));
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memcpy(data, test_ptrn, ARRAY_SIZE(test_ptrn));
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/* remember the last tst ptrn... once we have some */
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memcpy(link->test_ptrn, test_ptrn, ARRAY_SIZE(test_ptrn));
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return msg;
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}
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static struct msgb *mtp_create_slta(struct mtp_link *link, struct mtp_level_3_mng *in_mng, int l3_len)
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{
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struct mtp_level_3_hdr *hdr;
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struct mtp_level_3_mng *mng;
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struct msgb *out = mtp_msg_alloc(link);
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if (!out)
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return NULL;
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hdr = (struct mtp_level_3_hdr *) out->l2h;
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hdr->ser_ind = MTP_SI_MNT_REG_MSG;
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mng = (struct mtp_level_3_mng *) msgb_put(out, sizeof(*mng));
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mng->cmn.h0 = MTP_TST_MSG_GRP;
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mng->cmn.h1 = MTP_TST_MSG_SLTA;
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mng->length = l3_len - 2;
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msgb_put(out, mng->length);
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memcpy(mng->data, in_mng->data, mng->length);
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return out;
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}
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static struct msgb *mtp_tfp_alloc(struct mtp_link *link, int apoc)
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{
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struct mtp_level_3_hdr *hdr;
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struct mtp_level_3_prohib *prb;
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struct msgb *out = mtp_msg_alloc(link);
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if (!out)
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return NULL;
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hdr = (struct mtp_level_3_hdr *) out->l2h;
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hdr->ser_ind = MTP_SI_MNT_SNM_MSG;
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prb = (struct mtp_level_3_prohib *) msgb_put(out, sizeof(*prb));
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prb->cmn.h0 = MTP_PROHIBIT_MSG_GRP;
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prb->cmn.h1 = MTP_PROHIBIT_MSG_SIG;
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prb->apoc = MTP_MAKE_APOC(apoc);
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return out;
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}
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static struct msgb *mtp_tra_alloc(struct mtp_link *link)
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{
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struct mtp_level_3_hdr *hdr;
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struct mtp_level_3_cmn *cmn;
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struct msgb *out = mtp_msg_alloc(link);
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if (!out)
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return NULL;
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hdr = (struct mtp_level_3_hdr *) out->l2h;
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hdr->ser_ind = MTP_SI_MNT_SNM_MSG;
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cmn = (struct mtp_level_3_cmn *) msgb_put(out, sizeof(*cmn));
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cmn->h0 = MTP_TRF_RESTR_MSG_GRP;
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cmn->h1 = MTP_RESTR_MSG_ALLWED;
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return out;
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}
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static struct msgb *mtp_sccp_alloc_ssa(struct mtp_link *link, int sls)
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{
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struct sccp_data_unitdata *udt;
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struct sccp_con_ctrl_prt_mgt *prt;
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struct mtp_level_3_hdr *hdr;
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2010-07-30 20:37:26 +00:00
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uint8_t *data;
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2010-07-27 19:32:52 +00:00
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struct msgb *out = mtp_msg_alloc(link);
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if (!out)
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return NULL;
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hdr = (struct mtp_level_3_hdr *) out->l2h;
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hdr->ser_ind = MTP_SI_MNT_SCCP;
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/* this appears to be round robin or such.. */
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hdr->addr = MTP_ADDR(sls % 16, link->dpc, link->opc);
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/* generate the UDT message... libsccp does not offer formating yet */
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udt = (struct sccp_data_unitdata *) msgb_put(out, sizeof(*udt));
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udt->type = SCCP_MSG_TYPE_UDT;
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udt->proto_class = SCCP_PROTOCOL_CLASS_0;
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udt->variable_called = 3;
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udt->variable_calling = 5;
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udt->variable_data = 7;
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/* put the called and calling address. It is LV */
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data = msgb_put(out, 2 + 1);
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data[0] = 2;
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data[1] = 0x42;
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data[2] = 0x1;
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data = msgb_put(out, 2 + 1);
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data[0] = 2;
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data[1] = 0x42;
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data[2] = 0x1;
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data = msgb_put(out, 1);
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data[0] = sizeof(*prt);
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prt = (struct sccp_con_ctrl_prt_mgt *) msgb_put(out, sizeof(*prt));
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prt->sst = SCCP_SSA;
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prt->assn = 254;
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prt->apoc = MTP_MAKE_APOC(link->opc);
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prt->mul_ind = 0;
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return out;
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}
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void mtp_link_init(void)
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{
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tall_mtp_ctx = talloc_named_const(NULL, 1, "mtp-link");
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}
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static void mtp_send_sltm(struct mtp_link *link)
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{
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struct msgb *msg;
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link->sltm_pending = 1;
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msg = mtp_create_sltm(link);
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if (!msg) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate SLTM.\n");
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return;
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}
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mtp_link_submit(link, msg);
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}
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static void mtp_sltm_t1_timeout(void *_link)
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{
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struct mtp_link *link = (struct mtp_link *) _link;
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if (link->slta_misses == 0) {
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LOGP(DINP, LOGL_ERROR, "No SLTM response. Retrying. Link: %p\n", link);
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++link->slta_misses;
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mtp_send_sltm(link);
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bsc_schedule_timer(&link->t1_timer, MTP_T1);
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} else {
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LOGP(DINP, LOGL_ERROR, "Two missing SLTAs. Restart link: %p\n", link);
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link->sccp_up = 0;
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link->running = 0;
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bsc_del_timer(&link->t2_timer);
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mtp_link_sccp_down(link);
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mtp_link_restart(link);
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}
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}
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static void mtp_sltm_t2_timeout(void *_link)
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{
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struct mtp_link *link = (struct mtp_link *) _link;
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if (!link->running) {
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LOGP(DINP, LOGL_INFO, "Not restarting SLTM timer on link: %p\n", link);
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return;
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}
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link->slta_misses = 0;
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mtp_send_sltm(link);
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bsc_schedule_timer(&link->t1_timer, MTP_T1);
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if (link->sltm_once && link->was_up)
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LOGP(DINP, LOGL_INFO, "Not sending SLTM again as configured.\n");
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else
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bsc_schedule_timer(&link->t2_timer, MTP_T2);
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}
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static void mtp_delayed_start(void *link)
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{
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mtp_sltm_t2_timeout(link);
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}
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struct mtp_link *mtp_link_alloc(void)
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{
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struct mtp_link *link;
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link = talloc_zero(tall_mtp_ctx, struct mtp_link);
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if (!link)
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return NULL;
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link->t1_timer.data = link;
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link->t1_timer.cb = mtp_sltm_t1_timeout;
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link->t2_timer.data = link;
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link->t2_timer.cb = mtp_sltm_t2_timeout;
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link->delay_timer.data = link;
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link->delay_timer.cb = mtp_delayed_start;
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INIT_LLIST_HEAD(&link->pending_msgs);
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return link;
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}
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void mtp_link_stop(struct mtp_link *link)
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{
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bsc_del_timer(&link->t1_timer);
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bsc_del_timer(&link->t2_timer);
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bsc_del_timer(&link->delay_timer);
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link->sccp_up = 0;
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link->running = 0;
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link->sltm_pending = 0;
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mtp_link_sccp_down(link);
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}
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void mtp_link_reset(struct mtp_link *link)
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{
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mtp_link_stop(link);
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link->running = 1;
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bsc_schedule_timer(&link->delay_timer, START_DELAY);
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}
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static int mtp_link_sign_msg(struct mtp_link *link, struct mtp_level_3_hdr *hdr, int l3_len)
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{
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struct msgb *msg;
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struct mtp_level_3_cmn *cmn;
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2010-10-08 09:49:24 +00:00
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if (hdr->ni != MTP_NI_NATION_NET || l3_len < 1) {
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LOGP(DINP, LOGL_ERROR, "Unhandled data (ni: %d len: %d)\n",
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hdr->ni, l3_len);
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2010-07-27 19:32:52 +00:00
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return -1;
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}
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cmn = (struct mtp_level_3_cmn *) &hdr->data[0];
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LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n",
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cmn->h0, cmn->h1);
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switch (cmn->h0) {
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case MTP_TRF_RESTR_MSG_GRP:
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switch (cmn->h1) {
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case MTP_RESTR_MSG_ALLWED:
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LOGP(DINP, LOGL_INFO, "Received Restart Allowed. SST should be next: %p\n", link);
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link->sccp_up = 0;
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mtp_link_sccp_down(link);
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msg = mtp_tfp_alloc(link, 0);
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if (!msg)
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return -1;
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mtp_link_submit(link, msg);
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msg = mtp_tra_alloc(link);
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if (!msg)
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return -1;
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mtp_link_submit(link, msg);
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return 0;
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break;
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}
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break;
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}
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abort();
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return -1;
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}
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static int mtp_link_regular_msg(struct mtp_link *link, struct mtp_level_3_hdr *hdr, int l3_len)
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{
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struct msgb *out;
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struct mtp_level_3_mng *mng;
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2010-10-08 09:49:24 +00:00
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if (hdr->ni != MTP_NI_NATION_NET || l3_len < 1) {
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LOGP(DINP, LOGL_ERROR, "Unhandled data (ni: %d len: %d)\n",
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hdr->ni, l3_len);
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2010-07-27 19:32:52 +00:00
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return -1;
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}
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mng = (struct mtp_level_3_mng *) &hdr->data[0];
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LOGP(DINP, LOGL_DEBUG, "reg msg: h0: 0x%x h1: 0x%x\n",
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|
|
|
mng->cmn.h0, mng->cmn.h1);
|
|
|
|
|
|
|
|
switch (mng->cmn.h0) {
|
|
|
|
case MTP_TST_MSG_GRP:
|
|
|
|
switch (mng->cmn.h1) {
|
|
|
|
case MTP_TST_MSG_SLTM:
|
|
|
|
/* simply respond to the request... */
|
|
|
|
out = mtp_create_slta(link, mng, l3_len);
|
|
|
|
if (!out)
|
|
|
|
return -1;
|
|
|
|
mtp_link_submit(link, out);
|
|
|
|
return 0;
|
|
|
|
break;
|
|
|
|
case MTP_TST_MSG_SLTA:
|
|
|
|
if (mng->length != 14) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (l3_len != 16) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Wrongly sized SLTA: %u\n", mng->length);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (memcmp(mng->data, link->test_ptrn, sizeof(link->test_ptrn)) != 0) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Wrong test pattern SLTA\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* we had a matching slta */
|
|
|
|
bsc_del_timer(&link->t1_timer);
|
|
|
|
link->sltm_pending = 0;
|
|
|
|
mtp_link_slta_recv(link);
|
|
|
|
return 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mtp_link_sccp_data(struct mtp_link *link, struct mtp_level_3_hdr *hdr, struct msgb *msg, int l3_len)
|
|
|
|
{
|
|
|
|
struct msgb *out;
|
|
|
|
struct sccp_con_ctrl_prt_mgt *prt;
|
|
|
|
|
|
|
|
msg->l2h = &hdr->data[0];
|
|
|
|
if (msgb_l2len(msg) != l3_len) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Size is wrong after playing with the l2h header.\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if (link->sccp_up) {
|
|
|
|
mtp_link_forward_sccp(link, msg, MTP_LINK_SLS(hdr->addr));
|
|
|
|
return 0;
|
|
|
|
} else {
|
|
|
|
struct sccp_parse_result sccp;
|
|
|
|
memset(&sccp, 0, sizeof(sccp));
|
|
|
|
if (sccp_parse_header(msg, &sccp) != 0) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Failed to parsed SCCP header.\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sccp_determine_msg_type(msg) != SCCP_MSG_TYPE_UDT) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Dropping sccp data: 0x%x\n",
|
|
|
|
sccp_determine_msg_type(msg));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (msgb_l3len(msg) != 5) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "SCCP UDT msg of unexpected size: %u\n",
|
|
|
|
msgb_l3len(msg));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (msg->l3h[0] != SCCP_SST) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Expected SCCP SST but got 0x%x\n",
|
|
|
|
msg->l3h[0]);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
prt = (struct sccp_con_ctrl_prt_mgt *) &msg->l3h[0];
|
|
|
|
if (prt->assn != 254 || prt->apoc != MTP_MAKE_APOC(link->opc)) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Unknown SSN/APOC assn: %u, apoc: %u/%u\n",
|
|
|
|
prt->assn, ntohs(prt->apoc), prt->apoc);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
out = mtp_sccp_alloc_ssa(link, MTP_LINK_SLS(hdr->addr));
|
|
|
|
if (!out)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
link->sccp_up = 1;
|
|
|
|
link->was_up = 1;
|
|
|
|
LOGP(DINP, LOGL_INFO, "SCCP is established. %p\n", link);
|
|
|
|
mtp_link_submit(link, out);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int mtp_link_data(struct mtp_link *link, struct msgb *msg)
|
|
|
|
{
|
|
|
|
int rc = -1;
|
|
|
|
struct mtp_level_3_hdr *hdr;
|
|
|
|
int l3_len;
|
|
|
|
|
|
|
|
if (!msg->l2h || msgb_l2len(msg) < sizeof(*hdr))
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
if (!link->running) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "Link is not running. Call mtp_link_reset first: %p\n", link);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
hdr = (struct mtp_level_3_hdr *) msg->l2h;
|
|
|
|
l3_len = msgb_l2len(msg) - sizeof(*hdr);
|
|
|
|
|
|
|
|
switch (hdr->ser_ind) {
|
|
|
|
case MTP_SI_MNT_SNM_MSG:
|
|
|
|
rc = mtp_link_sign_msg(link, hdr, l3_len);
|
|
|
|
break;
|
|
|
|
case MTP_SI_MNT_REG_MSG:
|
|
|
|
rc = mtp_link_regular_msg(link, hdr, l3_len);
|
|
|
|
break;
|
|
|
|
case MTP_SI_MNT_SCCP:
|
|
|
|
rc = mtp_link_sccp_data(link, hdr, msg, l3_len);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
fprintf(stderr, "Unhandled: %u\n", hdr->ser_ind);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-07-30 20:37:26 +00:00
|
|
|
int mtp_link_submit_sccp_data(struct mtp_link *link, int sls, const uint8_t *data, unsigned int length)
|
2010-07-27 19:32:52 +00:00
|
|
|
{
|
2010-07-30 20:37:26 +00:00
|
|
|
uint8_t *put_ptr;
|
2010-07-27 19:32:52 +00:00
|
|
|
struct mtp_level_3_hdr *hdr;
|
|
|
|
struct msgb *msg;
|
|
|
|
|
|
|
|
if (!link->sccp_up) {
|
|
|
|
LOGP(DINP, LOGL_ERROR, "SCCP msg after TRA and before SSA. Dropping it.\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
msg = mtp_msg_alloc(link);
|
|
|
|
if (!msg)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
hdr = (struct mtp_level_3_hdr *) msg->l2h;
|
|
|
|
hdr->ser_ind = MTP_SI_MNT_SCCP;
|
|
|
|
|
|
|
|
hdr->addr = MTP_ADDR(sls % 16, link->dpc, link->opc);
|
|
|
|
|
|
|
|
/* copy the raw sccp data */
|
|
|
|
put_ptr = msgb_put(msg, length);
|
|
|
|
memcpy(put_ptr, data, length);
|
|
|
|
|
|
|
|
mtp_link_submit(link, msg);
|
|
|
|
return 0;
|
|
|
|
}
|