Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 1 | /*! \file gprs_ns2_fr.c |
| 2 | * NS-over-FR-over-GRE implementation. |
| 3 | * GPRS Networks Service (NS) messages on the Gb interface. |
| 4 | * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) |
| 5 | * as well as its successor 3GPP TS 48.016 */ |
| 6 | |
| 7 | /* (C) 2009-2010,2014,2017 by Harald Welte <laforge@gnumonks.org> |
| 8 | * (C) 2020 sysmocom - s.f.m.c. GmbH |
| 9 | * Author: Alexander Couzens <lynxis@fe80.eu> |
| 10 | * |
| 11 | * All Rights Reserved |
| 12 | * |
| 13 | * SPDX-License-Identifier: GPL-2.0+ |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or |
| 18 | * (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <errno.h> |
| 31 | #include <string.h> |
| 32 | #include <unistd.h> |
| 33 | |
| 34 | #include <sys/socket.h> |
| 35 | #include <netinet/in.h> |
| 36 | #include <netinet/ip.h> |
| 37 | #include <netinet/ip6.h> |
| 38 | #include <arpa/inet.h> |
| 39 | #include <net/if.h> |
| 40 | |
| 41 | #include <sys/ioctl.h> |
| 42 | #include <netpacket/packet.h> |
| 43 | #include <linux/if_ether.h> |
| 44 | #include <linux/hdlc.h> |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 45 | |
| 46 | #include <osmocom/gprs/frame_relay.h> |
| 47 | #include <osmocom/core/byteswap.h> |
| 48 | #include <osmocom/core/logging.h> |
| 49 | #include <osmocom/core/msgb.h> |
| 50 | #include <osmocom/core/select.h> |
| 51 | #include <osmocom/core/socket.h> |
| 52 | #include <osmocom/core/talloc.h> |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 53 | #include <osmocom/core/write_queue.h> |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 54 | #include <osmocom/gprs/gprs_ns2.h> |
| 55 | |
Pau Espin Pedrol | d41800c | 2020-12-07 13:35:24 +0100 | [diff] [blame] | 56 | #ifdef ENABLE_LIBMNL |
| 57 | #include <osmocom/core/mnl.h> |
| 58 | #endif |
| 59 | |
Harald Welte | 56f08a3 | 2020-12-01 23:07:32 +0100 | [diff] [blame] | 60 | #include "config.h" |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 61 | #include "common_vty.h" |
| 62 | #include "gprs_ns2_internal.h" |
| 63 | |
| 64 | #define GRE_PTYPE_FR 0x6559 |
| 65 | #define GRE_PTYPE_IPv4 0x0800 |
| 66 | #define GRE_PTYPE_IPv6 0x86dd |
| 67 | #define GRE_PTYPE_KAR 0x0000 /* keepalive response */ |
| 68 | |
| 69 | #ifndef IPPROTO_GRE |
| 70 | # define IPPROTO_GRE 47 |
| 71 | #endif |
| 72 | |
| 73 | struct gre_hdr { |
| 74 | uint16_t flags; |
| 75 | uint16_t ptype; |
| 76 | } __attribute__ ((packed)); |
| 77 | |
| 78 | static void free_bind(struct gprs_ns2_vc_bind *bind); |
| 79 | static int fr_dlci_rx_cb(void *cb_data, struct msgb *msg); |
| 80 | |
| 81 | struct gprs_ns2_vc_driver vc_driver_fr = { |
| 82 | .name = "GB frame relay", |
| 83 | .free_bind = free_bind, |
| 84 | }; |
| 85 | |
| 86 | struct priv_bind { |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 87 | char netif[IF_NAMESIZE]; |
| 88 | struct osmo_fr_link *link; |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 89 | struct osmo_wqueue wqueue; |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 90 | int ifindex; |
Harald Welte | 56f08a3 | 2020-12-01 23:07:32 +0100 | [diff] [blame] | 91 | bool if_running; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 92 | }; |
| 93 | |
| 94 | struct priv_vc { |
| 95 | struct osmo_sockaddr remote; |
| 96 | uint16_t dlci; |
| 97 | struct osmo_fr_dlc *dlc; |
| 98 | }; |
| 99 | |
| 100 | static void free_vc(struct gprs_ns2_vc *nsvc) |
| 101 | { |
| 102 | OSMO_ASSERT(nsvc); |
| 103 | |
| 104 | if (!nsvc->priv) |
| 105 | return; |
| 106 | |
| 107 | talloc_free(nsvc->priv); |
| 108 | nsvc->priv = NULL; |
| 109 | } |
| 110 | |
| 111 | static void dump_vty(const struct gprs_ns2_vc_bind *bind, struct vty *vty, bool _stats) |
| 112 | { |
| 113 | struct priv_bind *priv; |
| 114 | struct gprs_ns2_vc *nsvc; |
Harald Welte | 48bd76c | 2020-12-01 16:53:06 +0100 | [diff] [blame] | 115 | struct osmo_fr_link *fr_link; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 116 | |
| 117 | if (!bind) |
| 118 | return; |
| 119 | |
| 120 | priv = bind->priv; |
Harald Welte | 48bd76c | 2020-12-01 16:53:06 +0100 | [diff] [blame] | 121 | fr_link = priv->link; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 122 | |
Harald Welte | 56f08a3 | 2020-12-01 23:07:32 +0100 | [diff] [blame] | 123 | vty_out(vty, "FR bind: %s, role: %s, link: %s%s", priv->netif, |
| 124 | osmo_fr_role_str(fr_link->role), priv->if_running ? "UP" : "DOWN", VTY_NEWLINE); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 125 | |
| 126 | llist_for_each_entry(nsvc, &bind->nsvc, blist) { |
Harald Welte | 96ec84a | 2020-12-01 17:56:05 +0100 | [diff] [blame] | 127 | vty_out(vty, " NSVCI %05u: %s%s", nsvc->nsvci, gprs_ns2_ll_str(nsvc), VTY_NEWLINE); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | priv = bind->priv; |
| 131 | } |
| 132 | |
| 133 | /*! clean up all private driver state. Should be only called by gprs_ns2_free_bind() */ |
| 134 | static void free_bind(struct gprs_ns2_vc_bind *bind) |
| 135 | { |
| 136 | struct priv_bind *priv; |
| 137 | |
| 138 | if (!bind) |
| 139 | return; |
| 140 | |
| 141 | priv = bind->priv; |
| 142 | |
| 143 | OSMO_ASSERT(llist_empty(&bind->nsvc)); |
| 144 | |
| 145 | osmo_fr_link_free(priv->link); |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 146 | osmo_fd_close(&priv->wqueue.bfd); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 147 | talloc_free(priv); |
| 148 | } |
| 149 | |
| 150 | static struct priv_vc *fr_alloc_vc(struct gprs_ns2_vc_bind *bind, |
| 151 | struct gprs_ns2_vc *nsvc, |
| 152 | uint16_t dlci) |
| 153 | { |
| 154 | struct priv_bind *privb = bind->priv; |
| 155 | struct priv_vc *priv = talloc_zero(bind, struct priv_vc); |
| 156 | if (!priv) |
| 157 | return NULL; |
| 158 | |
| 159 | nsvc->priv = priv; |
| 160 | priv->dlci = dlci; |
| 161 | priv->dlc = osmo_fr_dlc_alloc(privb->link, dlci); |
| 162 | if (!priv->dlc) { |
| 163 | nsvc->priv = NULL; |
| 164 | talloc_free(priv); |
| 165 | return NULL; |
| 166 | } |
| 167 | |
| 168 | priv->dlc->rx_cb_data = nsvc; |
| 169 | priv->dlc->rx_cb = fr_dlci_rx_cb; |
| 170 | |
| 171 | return priv; |
| 172 | } |
| 173 | |
| 174 | int gprs_ns2_find_vc_by_dlci(struct gprs_ns2_vc_bind *bind, |
| 175 | uint16_t dlci, |
| 176 | struct gprs_ns2_vc **result) |
| 177 | { |
| 178 | struct gprs_ns2_vc *nsvc; |
| 179 | struct priv_vc *vcpriv; |
| 180 | |
| 181 | if (!result) |
| 182 | return -EINVAL; |
| 183 | |
| 184 | llist_for_each_entry(nsvc, &bind->nsvc, blist) { |
| 185 | vcpriv = nsvc->priv; |
| 186 | if (vcpriv->dlci != dlci) { |
| 187 | *result = nsvc; |
| 188 | return 0; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | return 1; |
| 193 | } |
| 194 | |
| 195 | /* PDU from the network interface towards the fr layer (upwards) */ |
| 196 | static int handle_netif_read(struct osmo_fd *bfd) |
| 197 | { |
| 198 | struct gprs_ns2_vc_bind *bind = bfd->data; |
| 199 | struct priv_bind *priv = bind->priv; |
| 200 | struct msgb *msg = msgb_alloc(NS_ALLOC_SIZE, "Gb/NS/FR/GRE Rx"); |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 201 | struct sockaddr_ll sll; |
| 202 | socklen_t sll_len = sizeof(sll); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 203 | int rc = 0; |
| 204 | |
| 205 | if (!msg) |
| 206 | return -ENOMEM; |
| 207 | |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 208 | rc = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE, 0, (struct sockaddr *)&sll, &sll_len); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 209 | if (rc < 0) { |
| 210 | LOGP(DLNS, LOGL_ERROR, "recv error %s during NS-FR-GRE recv\n", |
| 211 | strerror(errno)); |
| 212 | goto out_err; |
| 213 | } else if (rc == 0) { |
| 214 | goto out_err; |
| 215 | } |
| 216 | |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 217 | /* ignore any packets that we might have received for a different interface, between |
| 218 | * the socket() and the bind() call */ |
| 219 | if (sll.sll_ifindex != priv->ifindex) |
| 220 | goto out_err; |
| 221 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 222 | msgb_put(msg, rc); |
| 223 | msg->dst = priv->link; |
| 224 | return osmo_fr_rx(msg); |
| 225 | |
| 226 | out_err: |
| 227 | msgb_free(msg); |
| 228 | return rc; |
| 229 | } |
| 230 | |
| 231 | /* PDU from the frame relay towards the NS-VC (upwards) */ |
| 232 | static int fr_dlci_rx_cb(void *cb_data, struct msgb *msg) |
| 233 | { |
| 234 | int rc; |
| 235 | struct gprs_ns2_vc *nsvc = cb_data; |
| 236 | |
| 237 | rc = ns2_recv_vc(nsvc, msg); |
| 238 | |
| 239 | return rc; |
| 240 | } |
| 241 | |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 242 | static int handle_netif_write(struct osmo_fd *ofd, struct msgb *msg) |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 243 | { |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 244 | return write(ofd->fd, msgb_data(msg), msgb_length(msg)); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | /*! determine if given bind is for FR-GRE encapsulation. */ |
| 248 | int gprs_ns2_is_fr_bind(struct gprs_ns2_vc_bind *bind) |
| 249 | { |
| 250 | return (bind->driver == &vc_driver_fr); |
| 251 | } |
| 252 | |
| 253 | /* PDU from the NS-VC towards the frame relay layer (downwards) */ |
| 254 | static int fr_vc_sendmsg(struct gprs_ns2_vc *nsvc, struct msgb *msg) |
| 255 | { |
| 256 | struct priv_vc *vcpriv = nsvc->priv; |
| 257 | |
| 258 | msg->dst = vcpriv->dlc; |
| 259 | return osmo_fr_tx_dlc(msg); |
| 260 | } |
| 261 | |
| 262 | /* PDU from the frame relay layer towards the network interface (downwards) */ |
| 263 | int fr_tx_cb(void *data, struct msgb *msg) |
| 264 | { |
| 265 | struct gprs_ns2_vc_bind *bind = data; |
| 266 | struct priv_bind *priv = bind->priv; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 267 | |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 268 | if (osmo_wqueue_enqueue(&priv->wqueue, msg)) { |
| 269 | LOGP(DLNS, LOGL_ERROR, "frame relay %s: failed to enqueue message\n", |
| 270 | priv->netif); |
| 271 | msgb_free(msg); |
| 272 | return -EINVAL; |
| 273 | } |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 274 | |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 275 | return 0; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 276 | } |
| 277 | |
| 278 | static int devname2ifindex(const char *ifname) |
| 279 | { |
| 280 | struct ifreq ifr; |
| 281 | int sk, rc; |
| 282 | |
| 283 | sk = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
| 284 | if (sk < 0) |
| 285 | return sk; |
| 286 | |
| 287 | |
| 288 | memset(&ifr, 0, sizeof(ifr)); |
Neels Hofmeyr | 475a0ac | 2020-12-17 18:10:34 +0100 | [diff] [blame] | 289 | OSMO_STRLCPY_ARRAY(ifr.ifr_name, ifname); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 290 | |
| 291 | rc = ioctl(sk, SIOCGIFINDEX, &ifr); |
| 292 | close(sk); |
| 293 | if (rc < 0) |
| 294 | return rc; |
| 295 | |
| 296 | return ifr.ifr_ifindex; |
| 297 | } |
| 298 | |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 299 | static int open_socket(int ifindex) |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 300 | { |
| 301 | struct sockaddr_ll addr; |
Harald Welte | 4ed0f4e | 2020-12-10 21:50:32 +0100 | [diff] [blame] | 302 | int fd, rc; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 303 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 304 | memset(&addr, 0, sizeof(addr)); |
| 305 | addr.sll_family = AF_PACKET; |
| 306 | addr.sll_protocol = htons(ETH_P_ALL); |
| 307 | addr.sll_ifindex = ifindex; |
| 308 | |
Harald Welte | 5bea72e | 2020-12-10 22:06:21 +0100 | [diff] [blame] | 309 | fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_HDLC)); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 310 | if (fd < 0) { |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 311 | LOGP(DLNS, LOGL_ERROR, "Can not create AF_PACKET socket. Are you root or have CAP_RAW_SOCKET?\n"); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 312 | return fd; |
| 313 | } |
| 314 | |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 315 | /* there's a race condition between the above syscall and the bind() call below, |
| 316 | * causing other packets to be received in between */ |
| 317 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 318 | rc = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); |
| 319 | if (rc < 0) { |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 320 | LOGP(DLNS, LOGL_ERROR, "Can not bind AF_PACKET socket to ifindex %d\n", ifindex); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 321 | close(fd); |
| 322 | return rc; |
| 323 | } |
| 324 | |
| 325 | return fd; |
| 326 | } |
| 327 | |
Harald Welte | 56f08a3 | 2020-12-01 23:07:32 +0100 | [diff] [blame] | 328 | #ifdef ENABLE_LIBMNL |
| 329 | |
| 330 | #include <osmocom/core/mnl.h> |
Harald Welte | 56f08a3 | 2020-12-01 23:07:32 +0100 | [diff] [blame] | 331 | #include <linux/if_link.h> |
| 332 | #include <linux/rtnetlink.h> |
| 333 | |
| 334 | #ifndef ARPHRD_FRAD |
| 335 | #define ARPHRD_FRAD 770 |
| 336 | #endif |
| 337 | |
| 338 | /* validate the netlink attributes */ |
| 339 | static int data_attr_cb(const struct nlattr *attr, void *data) |
| 340 | { |
| 341 | const struct nlattr **tb = data; |
| 342 | int type = mnl_attr_get_type(attr); |
| 343 | |
| 344 | if (mnl_attr_type_valid(attr, IFLA_MAX) < 0) |
| 345 | return MNL_CB_OK; |
| 346 | |
| 347 | switch (type) { |
| 348 | case IFLA_MTU: |
| 349 | if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) |
| 350 | return MNL_CB_ERROR; |
| 351 | break; |
| 352 | case IFLA_IFNAME: |
| 353 | if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) |
| 354 | return MNL_CB_ERROR; |
| 355 | break; |
| 356 | } |
| 357 | tb[type] = attr; |
| 358 | return MNL_CB_OK; |
| 359 | } |
| 360 | |
| 361 | /* find the bind for the netdev (if any) */ |
| 362 | static struct gprs_ns2_vc_bind *bind4netdev(struct gprs_ns2_inst *nsi, const char *ifname) |
| 363 | { |
| 364 | struct gprs_ns2_vc_bind *bind; |
| 365 | |
| 366 | llist_for_each_entry(bind, &nsi->binding, list) { |
| 367 | struct priv_bind *bpriv = bind->priv; |
| 368 | if (!strcmp(bpriv->netif, ifname)) |
| 369 | return bind; |
| 370 | } |
| 371 | |
| 372 | return NULL; |
| 373 | } |
| 374 | |
| 375 | /* handle a single netlink message received via libmnl */ |
| 376 | static int linkmon_mnl_cb(const struct nlmsghdr *nlh, void *data) |
| 377 | { |
| 378 | struct osmo_mnl *omnl = data; |
| 379 | struct gprs_ns2_vc_bind *bind; |
| 380 | struct nlattr *tb[IFLA_MAX+1] = {}; |
| 381 | struct ifinfomsg *ifm = mnl_nlmsg_get_payload(nlh); |
| 382 | struct gprs_ns2_inst *nsi; |
| 383 | const char *ifname; |
| 384 | bool if_running; |
| 385 | |
| 386 | OSMO_ASSERT(omnl); |
| 387 | OSMO_ASSERT(ifm); |
| 388 | |
| 389 | nsi = omnl->priv; |
| 390 | |
| 391 | if (ifm->ifi_type != ARPHRD_FRAD) |
| 392 | return MNL_CB_OK; |
| 393 | |
| 394 | mnl_attr_parse(nlh, sizeof(*ifm), data_attr_cb, tb); |
| 395 | |
| 396 | if (!tb[IFLA_IFNAME]) |
| 397 | return MNL_CB_OK; |
| 398 | ifname = mnl_attr_get_str(tb[IFLA_IFNAME]); |
| 399 | if_running = !!(ifm->ifi_flags & IFF_RUNNING); |
| 400 | |
| 401 | bind = bind4netdev(nsi, ifname); |
| 402 | if (bind) { |
| 403 | struct priv_bind *bpriv = bind->priv; |
| 404 | if (bpriv->if_running != if_running) { |
| 405 | /* update running state */ |
| 406 | LOGP(DLNS, LOGL_NOTICE, "FR net-device '%s': Physical link state changed: %s\n", |
| 407 | ifname, if_running ? "UP" : "DOWN"); |
| 408 | bpriv->if_running = if_running; |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | return MNL_CB_OK; |
| 413 | } |
| 414 | |
| 415 | /* trigger one initial dump of all link information */ |
| 416 | static void linkmon_initial_dump(struct osmo_mnl *omnl) |
| 417 | { |
| 418 | char buf[MNL_SOCKET_BUFFER_SIZE]; |
| 419 | struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf); |
| 420 | struct rtgenmsg *rt; |
| 421 | |
| 422 | nlh->nlmsg_type = RTM_GETLINK; |
| 423 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; |
| 424 | nlh->nlmsg_seq = time(NULL); |
| 425 | rt = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtgenmsg)); |
| 426 | rt->rtgen_family = AF_PACKET; |
| 427 | |
| 428 | if (mnl_socket_sendto(omnl->mnls, nlh, nlh->nlmsg_len) < 0) { |
| 429 | LOGP(DLNS, LOGL_ERROR, "linkmon: Cannot send rtnetlink message: %s\n", strerror(errno)); |
| 430 | } |
| 431 | |
| 432 | /* the response[s] will be handled just like the events */ |
| 433 | } |
| 434 | #endif /* LIBMNL */ |
| 435 | |
| 436 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 437 | /*! Create a new bind for NS over FR. |
| 438 | * \param[in] nsi NS instance in which to create the bind |
| 439 | * \param[in] netif Network interface to bind to |
| 440 | * \param[in] fr_network |
| 441 | * \param[in] fr_role |
| 442 | * \param[out] result pointer to created bind |
| 443 | * \return 0 on success; negative on error */ |
| 444 | int gprs_ns2_fr_bind(struct gprs_ns2_inst *nsi, |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 445 | const char *name, |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 446 | const char *netif, |
| 447 | struct osmo_fr_network *fr_network, |
| 448 | enum osmo_fr_role fr_role, |
| 449 | struct gprs_ns2_vc_bind **result) |
| 450 | { |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 451 | struct gprs_ns2_vc_bind *bind; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 452 | struct priv_bind *priv; |
| 453 | struct osmo_fr_link *fr_link; |
| 454 | int rc = 0; |
| 455 | |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 456 | if (!name) |
| 457 | return -EINVAL; |
| 458 | |
| 459 | if (gprs_ns2_bind_by_name(nsi, name)) |
| 460 | return -EALREADY; |
| 461 | |
| 462 | bind = talloc_zero(nsi, struct gprs_ns2_vc_bind); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 463 | if (!bind) |
| 464 | return -ENOSPC; |
| 465 | |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 466 | bind->name = talloc_strdup(bind, name); |
| 467 | if (!bind->name) { |
| 468 | rc = -ENOSPC; |
| 469 | goto err_bind; |
| 470 | } |
| 471 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 472 | bind->driver = &vc_driver_fr; |
Alexander Couzens | aac9016 | 2020-11-19 02:44:04 +0100 | [diff] [blame] | 473 | bind->ll = GPRS_NS2_LL_FR; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 474 | bind->send_vc = fr_vc_sendmsg; |
| 475 | bind->free_vc = free_vc; |
| 476 | bind->dump_vty = dump_vty; |
| 477 | bind->nsi = nsi; |
| 478 | priv = bind->priv = talloc_zero(bind, struct priv_bind); |
| 479 | if (!priv) { |
| 480 | rc = -ENOSPC; |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 481 | goto err_name; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 482 | } |
| 483 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 484 | if (strlen(netif) > IF_NAMESIZE) { |
| 485 | rc = -EINVAL; |
| 486 | goto err_priv; |
| 487 | } |
Neels Hofmeyr | 8fef761 | 2020-12-17 18:19:19 +0100 | [diff] [blame] | 488 | OSMO_STRLCPY_ARRAY(priv->netif, netif); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 489 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 490 | if (result) |
| 491 | *result = bind; |
| 492 | |
| 493 | /* FIXME: move fd handling into socket.c */ |
| 494 | fr_link = osmo_fr_link_alloc(fr_network, fr_role, netif); |
| 495 | if (!fr_link) { |
| 496 | rc = -EINVAL; |
| 497 | goto err_priv; |
| 498 | } |
| 499 | |
| 500 | fr_link->tx_cb = fr_tx_cb; |
| 501 | fr_link->tx_cb_data = bind; |
| 502 | priv->link = fr_link; |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 503 | |
Alexander Couzens | 6f89c77 | 2020-12-17 03:06:39 +0100 | [diff] [blame] | 504 | priv->ifindex = rc = devname2ifindex(netif); |
| 505 | if (rc < 0) { |
Harald Welte | 41b188b | 2020-12-10 22:00:23 +0100 | [diff] [blame] | 506 | LOGP(DLNS, LOGL_ERROR, "Can not get interface index for interface %s\n", netif); |
| 507 | goto err_fr; |
| 508 | } |
| 509 | |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 510 | rc = open_socket(priv->ifindex); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 511 | if (rc < 0) |
| 512 | goto err_fr; |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 513 | osmo_wqueue_init(&priv->wqueue, 10); |
| 514 | priv->wqueue.write_cb = handle_netif_write; |
| 515 | priv->wqueue.read_cb = handle_netif_read; |
| 516 | osmo_fd_setup(&priv->wqueue.bfd, rc, OSMO_FD_READ, osmo_wqueue_bfd_cb, bind, 0); |
| 517 | rc = osmo_fd_register(&priv->wqueue.bfd); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 518 | if (rc < 0) |
| 519 | goto err_fd; |
| 520 | |
| 521 | INIT_LLIST_HEAD(&bind->nsvc); |
| 522 | llist_add(&bind->list, &nsi->binding); |
| 523 | |
Harald Welte | 56f08a3 | 2020-12-01 23:07:32 +0100 | [diff] [blame] | 524 | #ifdef ENABLE_LIBMNL |
| 525 | if (!nsi->linkmon_mnl) |
| 526 | nsi->linkmon_mnl = osmo_mnl_init(nsi, NETLINK_ROUTE, RTMGRP_LINK, linkmon_mnl_cb, nsi); |
| 527 | |
| 528 | /* we get a new full dump after every bind. which is a bit excessive. But that's just once |
| 529 | * at start-up, so we can get away with it */ |
| 530 | if (nsi->linkmon_mnl) |
| 531 | linkmon_initial_dump(nsi->linkmon_mnl); |
| 532 | #endif |
| 533 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 534 | return rc; |
| 535 | |
| 536 | err_fd: |
Alexander Couzens | 60021a4 | 2020-12-17 02:48:22 +0100 | [diff] [blame^] | 537 | close(priv->wqueue.bfd.fd); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 538 | err_fr: |
| 539 | osmo_fr_link_free(fr_link); |
| 540 | err_priv: |
| 541 | talloc_free(priv); |
Alexander Couzens | aaa55a6 | 2020-12-03 06:02:03 +0100 | [diff] [blame] | 542 | err_name: |
| 543 | talloc_free((char *)bind->name); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 544 | err_bind: |
| 545 | talloc_free(bind); |
| 546 | |
| 547 | return rc; |
| 548 | } |
| 549 | |
Alexander Couzens | c782cec | 2020-12-10 04:10:25 +0100 | [diff] [blame] | 550 | /*! Return the frame relay role of a bind |
| 551 | * \param[in] bind The bind |
| 552 | * \return the frame relay role or -EINVAL if bind is not frame relay |
| 553 | */ |
| 554 | enum osmo_fr_role gprs_ns2_fr_bind_role(struct gprs_ns2_vc_bind *bind) |
| 555 | { |
| 556 | struct priv_bind *priv; |
| 557 | |
| 558 | if (bind->driver != &vc_driver_fr) |
| 559 | return -EINVAL; |
| 560 | |
| 561 | priv = bind->priv; |
| 562 | return priv->link->role; |
| 563 | } |
| 564 | |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 565 | /*! Return the network interface of the bind |
| 566 | * \param[in] bind The bind |
| 567 | * \return the network interface |
| 568 | */ |
| 569 | const char *gprs_ns2_fr_bind_netif(struct gprs_ns2_vc_bind *bind) |
| 570 | { |
| 571 | struct priv_bind *priv; |
| 572 | |
| 573 | if (bind->driver != &vc_driver_fr) |
| 574 | return NULL; |
| 575 | |
| 576 | priv = bind->priv; |
| 577 | return priv->netif; |
| 578 | } |
| 579 | |
| 580 | /*! Find NS bind for a given network interface |
| 581 | * \param[in] nsi NS instance |
| 582 | * \param[in] netif the network interface to search for |
| 583 | * \return the bind or NULL if not found |
| 584 | */ |
| 585 | struct gprs_ns2_vc_bind *gprs_ns2_fr_bind_by_netif( |
| 586 | struct gprs_ns2_inst *nsi, |
| 587 | const char *netif) |
| 588 | { |
| 589 | struct gprs_ns2_vc_bind *bind; |
| 590 | const char *_netif; |
| 591 | |
| 592 | OSMO_ASSERT(nsi); |
| 593 | OSMO_ASSERT(netif); |
| 594 | |
| 595 | llist_for_each_entry(bind, &nsi->binding, list) { |
| 596 | if (!gprs_ns2_is_fr_bind(bind)) |
| 597 | continue; |
| 598 | |
| 599 | _netif = gprs_ns2_fr_bind_netif(bind); |
| 600 | if (!strncmp(_netif, netif, IF_NAMESIZE)) |
| 601 | return bind; |
| 602 | } |
| 603 | |
| 604 | return NULL; |
| 605 | } |
| 606 | |
| 607 | /*! Create, connect and activate a new FR-based NS-VC |
| 608 | * \param[in] bind bind in which the new NS-VC is to be created |
| 609 | * \param[in] nsei NSEI of the NS Entity in which the NS-VC is to be created |
| 610 | * \param[in] dlci Data Link connection identifier |
| 611 | * \return pointer to newly-allocated, connected and activated NS-VC; NULL on error */ |
| 612 | struct gprs_ns2_vc *gprs_ns2_fr_connect(struct gprs_ns2_vc_bind *bind, |
Alexander Couzens | ebcbd72 | 2020-12-03 06:11:39 +0100 | [diff] [blame] | 613 | struct gprs_ns2_nse *nse, |
| 614 | uint16_t nsvci, |
| 615 | uint16_t dlci) |
| 616 | { |
| 617 | struct gprs_ns2_vc *nsvc = NULL; |
| 618 | struct priv_vc *priv = NULL; |
| 619 | |
| 620 | nsvc = gprs_ns2_fr_nsvc_by_dlci(bind, dlci); |
| 621 | if (nsvc) { |
| 622 | goto err; |
| 623 | } |
| 624 | |
| 625 | nsvc = ns2_vc_alloc(bind, nse, true, NS2_VC_MODE_BLOCKRESET); |
| 626 | if (!nsvc) |
| 627 | goto err; |
| 628 | |
| 629 | nsvc->priv = priv = fr_alloc_vc(bind, nsvc, dlci); |
| 630 | if (!priv) |
| 631 | goto err; |
| 632 | |
| 633 | nsvc->nsvci = nsvci; |
| 634 | nsvc->nsvci_is_valid = true; |
| 635 | |
| 636 | gprs_ns2_vc_fsm_start(nsvc); |
| 637 | |
| 638 | return nsvc; |
| 639 | |
| 640 | err: |
| 641 | gprs_ns2_free_nsvc(nsvc); |
| 642 | return NULL; |
| 643 | } |
| 644 | |
| 645 | |
| 646 | /*! Create, connect and activate a new FR-based NS-VC |
| 647 | * \param[in] bind bind in which the new NS-VC is to be created |
| 648 | * \param[in] nsei NSEI of the NS Entity in which the NS-VC is to be created |
| 649 | * \param[in] dlci Data Link connection identifier |
| 650 | * \return pointer to newly-allocated, connected and activated NS-VC; NULL on error */ |
| 651 | struct gprs_ns2_vc *gprs_ns2_fr_connect2(struct gprs_ns2_vc_bind *bind, |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 652 | uint16_t nsei, |
| 653 | uint16_t nsvci, |
| 654 | uint16_t dlci) |
| 655 | { |
| 656 | bool created_nse = false; |
| 657 | struct gprs_ns2_vc *nsvc = NULL; |
| 658 | struct priv_vc *priv = NULL; |
| 659 | struct gprs_ns2_nse *nse = gprs_ns2_nse_by_nsei(bind->nsi, nsei); |
| 660 | if (!nse) { |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 661 | nse = gprs_ns2_create_nse(bind->nsi, nsei, GPRS_NS2_LL_FR, NS2_DIALECT_STATIC_RESETBLOCK); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 662 | if (!nse) |
| 663 | return NULL; |
| 664 | created_nse = true; |
| 665 | } |
| 666 | |
| 667 | nsvc = gprs_ns2_fr_nsvc_by_dlci(bind, dlci); |
| 668 | if (nsvc) { |
| 669 | goto err_nse; |
| 670 | } |
| 671 | |
Alexander Couzens | d923cff | 2020-12-01 01:03:52 +0100 | [diff] [blame] | 672 | nsvc = ns2_vc_alloc(bind, nse, true, NS2_VC_MODE_BLOCKRESET); |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 673 | if (!nsvc) |
| 674 | goto err_nse; |
| 675 | |
| 676 | nsvc->priv = priv = fr_alloc_vc(bind, nsvc, dlci); |
| 677 | if (!priv) |
| 678 | goto err; |
| 679 | |
| 680 | nsvc->nsvci = nsvci; |
| 681 | nsvc->nsvci_is_valid = true; |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 682 | |
| 683 | gprs_ns2_vc_fsm_start(nsvc); |
| 684 | |
| 685 | return nsvc; |
| 686 | |
| 687 | err: |
| 688 | gprs_ns2_free_nsvc(nsvc); |
| 689 | err_nse: |
| 690 | if (created_nse) |
| 691 | gprs_ns2_free_nse(nse); |
| 692 | |
| 693 | return NULL; |
| 694 | } |
| 695 | |
| 696 | /*! Return the nsvc by dlci. |
| 697 | * \param[in] bind |
| 698 | * \param[in] dlci Data Link connection identifier |
| 699 | * \return the nsvc or NULL if not found |
| 700 | */ |
| 701 | struct gprs_ns2_vc *gprs_ns2_fr_nsvc_by_dlci(struct gprs_ns2_vc_bind *bind, |
| 702 | uint16_t dlci) |
| 703 | { |
| 704 | struct gprs_ns2_vc *nsvc; |
| 705 | struct priv_vc *vcpriv; |
| 706 | |
| 707 | llist_for_each_entry(nsvc, &bind->nsvc, blist) { |
| 708 | vcpriv = nsvc->priv; |
| 709 | |
| 710 | if (dlci == vcpriv->dlci) |
| 711 | return nsvc; |
| 712 | } |
| 713 | |
| 714 | return NULL; |
| 715 | } |
| 716 | |
| 717 | /*! Return the dlci of the nsvc |
| 718 | * \param[in] nsvc |
| 719 | * \return the dlci or 0 on error. 0 is not a valid dlci. |
| 720 | */ |
Alexander Couzens | 22c26e0 | 2020-12-10 04:10:07 +0100 | [diff] [blame] | 721 | uint16_t gprs_ns2_fr_nsvc_dlci(const struct gprs_ns2_vc *nsvc) |
Alexander Couzens | 841817e | 2020-11-19 00:41:29 +0100 | [diff] [blame] | 722 | { |
| 723 | struct priv_vc *vcpriv; |
| 724 | |
| 725 | if (!nsvc->bind) |
| 726 | return 0; |
| 727 | |
| 728 | if (nsvc->bind->driver != &vc_driver_fr) |
| 729 | return 0; |
| 730 | |
| 731 | vcpriv = nsvc->priv; |
| 732 | return vcpriv->dlci; |
| 733 | } |