diff options
Diffstat (limited to 'src/osmo-bts-oc2g/misc/oc2gbts_mgr_nl.c')
| -rw-r--r-- | src/osmo-bts-oc2g/misc/oc2gbts_mgr_nl.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/osmo-bts-oc2g/misc/oc2gbts_mgr_nl.c b/src/osmo-bts-oc2g/misc/oc2gbts_mgr_nl.c new file mode 100644 index 00000000..db67caf2 --- /dev/null +++ b/src/osmo-bts-oc2g/misc/oc2gbts_mgr_nl.c @@ -0,0 +1,208 @@ +/* NetworkListen for NuRAN OC-2G BTS management daemon */ + +/* Copyright (C) 2015 by Yves Godin <support@nuranwireless.com> + * + * Based on sysmoBTS: + * sysmobts_mgr_nl.c + * (C) 2014 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 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 "misc/oc2gbts_mgr.h" +#include "misc/oc2gbts_misc.h" +#include "misc/oc2gbts_nl.h" +#include "misc/oc2gbts_par.h" +#include "misc/oc2gbts_bid.h" + +#include <osmo-bts/logging.h> + +#include <osmocom/gsm/protocol/ipaccess.h> + +#include <osmocom/core/msgb.h> +#include <osmocom/core/socket.h> +#include <osmocom/core/select.h> + +#include <arpa/inet.h> + +#include <sys/types.h> +#include <sys/socket.h> + +#include <errno.h> +#include <string.h> +#include <fcntl.h> +#include <unistd.h> + +#define ETH0_ADDR_SYSFS "/var/oc2g/net/eth0/address" + +static struct osmo_fd nl_fd; + +/* + * The TLV structure in IPA messages in UDP packages is a bit + * weird. First the header appears to have an extra NULL byte + * and second the L16 of the L16TV needs to include +1 for the + * tag. The default msgb/tlv and libosmo-abis routines do not + * provide this. + */ + +static void ipaccess_prepend_header_quirk(struct msgb *msg, int proto) +{ + struct ipaccess_head *hh; + + /* prepend the ip.access header */ + hh = (struct ipaccess_head *) msgb_push(msg, sizeof(*hh) + 1); + hh->len = htons(msg->len - sizeof(*hh) - 1); + hh->proto = proto; +} + +static void quirk_l16tv_put(struct msgb *msg, uint16_t len, uint8_t tag, + const uint8_t *val) +{ + uint8_t *buf = msgb_put(msg, len + 2 + 1); + + *buf++ = (len + 1) >> 8; + *buf++ = (len + 1) & 0xff; + *buf++ = tag; + memcpy(buf, val, len); +} + +/* + * We don't look at the content of the request yet and lie + * about most of the responses. + */ +static void respond_to(struct sockaddr_in *src, struct osmo_fd *fd, + uint8_t *data, size_t len) +{ + static int fetched_info = 0; + static char mac_str[20] = {0, }; + static char model_name[64] = {0, }; + static char ser_str[20] = {0, }; + + struct sockaddr_in loc_addr; + int rc; + char loc_ip[INET_ADDRSTRLEN]; + struct msgb *msg = msgb_alloc_headroom(512, 128, "ipa get response"); + if (!msg) { + LOGP(DFIND, LOGL_ERROR, "Failed to allocate msgb\n"); + return; + } + + if (!fetched_info) { + int fd_eth; + int serno; + int model; + char rev_maj, rev_min; + + /* fetch the MAC */ + fd_eth = open(ETH0_ADDR_SYSFS, O_RDONLY); + if (fd_eth >= 0) { + read(fd_eth, mac_str, sizeof(mac_str)-1); + mac_str[sizeof(mac_str)-1] = '\0'; + close(fd_eth); + } + + /* fetch the serial number */ + oc2gbts_par_get_int(OC2GBTS_PAR_SERNR, &serno); + snprintf(ser_str, sizeof(ser_str), "%d", serno); + + /* fetch the model and trx number */ + snprintf(model_name, sizeof(model_name), "OC-2G BTS"); + + oc2gbts_rev_get(&rev_maj, &rev_min); + snprintf(model_name, sizeof(model_name), "%s Rev %c.%c", + model_name, rev_maj, rev_min); + + model = oc2gbts_model_get(); + if (model >= 0) { + snprintf(model_name, sizeof(model_name), "%s (%05X)", + model_name, model); + } + fetched_info = 1; + } + + if (source_for_dest(&src->sin_addr, &loc_addr.sin_addr) != 0) { + LOGP(DFIND, LOGL_ERROR, "Failed to determine local source\n"); + return; + } + + msgb_put_u8(msg, IPAC_MSGT_ID_RESP); + + /* append MAC addr */ + quirk_l16tv_put(msg, strlen(mac_str) + 1, IPAC_IDTAG_MACADDR, (uint8_t *) mac_str); + + /* append ip address */ + inet_ntop(AF_INET, &loc_addr.sin_addr, loc_ip, sizeof(loc_ip)); + quirk_l16tv_put(msg, strlen(loc_ip) + 1, IPAC_IDTAG_IPADDR, (uint8_t *) loc_ip); + + /* append the serial number */ + quirk_l16tv_put(msg, strlen(ser_str) + 1, IPAC_IDTAG_SERNR, (uint8_t *) ser_str); + + /* abuse some flags */ + quirk_l16tv_put(msg, strlen(model_name) + 1, IPAC_IDTAG_UNIT, (uint8_t *) model_name); + + /* ip.access nanoBTS would reply to port==3006 */ + ipaccess_prepend_header_quirk(msg, IPAC_PROTO_IPACCESS); + rc = sendto(fd->fd, msg->data, msg->len, 0, (struct sockaddr *)src, sizeof(*src)); + if (rc != msg->len) + LOGP(DFIND, LOGL_ERROR, + "Failed to send with rc(%d) errno(%d)\n", rc, errno); +} + +static int ipaccess_bcast(struct osmo_fd *fd, unsigned int what) +{ + uint8_t data[2048]; + char src[INET_ADDRSTRLEN]; + struct sockaddr_in addr = {}; + socklen_t len = sizeof(addr); + int rc; + + rc = recvfrom(fd->fd, data, sizeof(data), 0, + (struct sockaddr *) &addr, &len); + if (rc <= 0) { + LOGP(DFIND, LOGL_ERROR, + "Failed to read from socket errno(%d)\n", errno); + return -1; + } + + LOGP(DFIND, LOGL_DEBUG, + "Received request from: %s size %d\n", + inet_ntop(AF_INET, &addr.sin_addr, src, sizeof(src)), rc); + + if (rc < 6) + return 0; + + if (data[2] != IPAC_PROTO_IPACCESS || data[4] != IPAC_MSGT_ID_GET) + return 0; + + respond_to(&addr, fd, data + 6, rc - 6); + return 0; +} + +int oc2gbts_mgr_nl_init(void) +{ + int rc; + + nl_fd.cb = ipaccess_bcast; + rc = osmo_sock_init_ofd(&nl_fd, AF_INET, SOCK_DGRAM, IPPROTO_UDP, + "0.0.0.0", 3006, OSMO_SOCK_F_BIND); + if (rc < 0) { + perror("Socket creation"); + return -1; + } + + return 0; +} |