Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 1 | |
| 2 | /* network device (interface) functions. |
| 3 | * (C) 2023 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de> |
| 4 | * Author: Pau Espin Pedrol <pespin@sysmocom.de> |
| 5 | * |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * SPDX-License-Identifier: GPL-2.0+ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include "config.h" |
| 23 | |
| 24 | /*! \addtogroup netdev |
| 25 | * @{ |
| 26 | * network device (interface) convenience functions |
| 27 | * |
| 28 | * \file netdev.c |
| 29 | * |
| 30 | * Example lifecycle use of the API: |
| 31 | * |
| 32 | * struct osmo_sockaddr_str osa_str = {}; |
| 33 | * struct osmo_sockaddr osa = {}; |
| 34 | * |
| 35 | * // Allocate object: |
| 36 | * struct osmo_netdev *netdev = osmo_netdev_alloc(parent_talloc_ctx, name); |
| 37 | * OSMO_ASSERT(netdev); |
| 38 | * |
| 39 | * // Configure object (before registration): |
| 40 | * rc = osmo_netdev_set_netns_name(netdev, "some_netns_name_or_null"); |
| 41 | * rc = osmo_netdev_set_ifindex(netdev, if_nametoindex("eth0")); |
| 42 | * |
| 43 | * // Register object: |
| 44 | * rc = osmo_netdev_register(netdev); |
| 45 | * // The network interface is now being monitored and the network interface |
| 46 | * // can be operated (see below) |
| 47 | * |
| 48 | * // Add a local IPv4 address: |
| 49 | * rc = osmo_sockaddr_str_from_str2(&osa_str, "192.168.200.1"); |
| 50 | * rc = osmo_sockaddr_str_to_sockaddr(&osa_str, &osa.u.sas); |
| 51 | * rc = osmo_netdev_add_addr(netdev, &osa, 24); |
| 52 | * |
| 53 | * // Bring network interface up: |
| 54 | * rc = osmo_netdev_ifupdown(netdev, true); |
| 55 | * |
| 56 | * // Add default route (0.0.0.0/0): |
| 57 | * rc = osmo_sockaddr_str_from_str2(&osa_str, "0.0.0.0"); |
| 58 | * rc = osmo_sockaddr_str_to_sockaddr(&osa_str, &osa.u.sas); |
| 59 | * rc = osmo_netdev_add_route(netdev, &osa, 0, NULL); |
| 60 | * |
| 61 | * // Unregister (can be freed directly too): |
| 62 | * rc = osmo_netdev_unregister(netdev); |
| 63 | * // Free the object: |
| 64 | * osmo_netdev_free(netdev); |
| 65 | */ |
| 66 | |
| 67 | #if (!EMBEDDED) |
| 68 | |
| 69 | #include <stdio.h> |
| 70 | #include <stdlib.h> |
| 71 | #include <stdio.h> |
| 72 | #include <fcntl.h> |
| 73 | #include <unistd.h> |
| 74 | #include <errno.h> |
| 75 | #include <ifaddrs.h> |
| 76 | #include <sys/types.h> |
| 77 | #include <sys/time.h> |
| 78 | #include <sys/ioctl.h> |
| 79 | #include <sys/socket.h> |
| 80 | #include <sys/stat.h> |
| 81 | #include <sys/time.h> |
| 82 | #include <net/if.h> |
| 83 | #include <net/route.h> |
| 84 | |
| 85 | #if defined(__linux__) |
| 86 | #include <linux/if_link.h> |
| 87 | #include <linux/rtnetlink.h> |
| 88 | #else |
| 89 | #error "Unknown platform!" |
| 90 | #endif |
| 91 | |
| 92 | #include <osmocom/core/utils.h> |
| 93 | #include <osmocom/core/select.h> |
| 94 | #include <osmocom/core/linuxlist.h> |
| 95 | #include <osmocom/core/logging.h> |
| 96 | #include <osmocom/core/socket.h> |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 97 | #include <osmocom/core/netns.h> |
| 98 | #include <osmocom/core/netdev.h> |
| 99 | |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 100 | #if ENABLE_LIBMNL |
| 101 | #include <osmocom/core/mnl.h> |
| 102 | #endif |
| 103 | |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 104 | #define IFINDEX_UNUSED 0 |
| 105 | |
| 106 | #define LOGNETDEV(netdev, lvl, fmt, args ...) \ |
| 107 | LOGP(DLGLOBAL, lvl, "NETDEV(%s,if=%s/%u,ns=%s): " fmt, \ |
| 108 | (netdev)->name, osmo_netdev_get_dev_name(netdev) ? : "", \ |
| 109 | (netdev)->ifindex, (netdev)->netns_name ? : "", ## args) |
| 110 | |
| 111 | static struct llist_head g_netdev_netns_ctx_list = LLIST_HEAD_INIT(g_netdev_netns_ctx_list); |
| 112 | static struct llist_head g_netdev_list = LLIST_HEAD_INIT(g_netdev_list); |
| 113 | |
| 114 | /* One per netns, shared by all osmo_netdev in a given netns: */ |
| 115 | struct netdev_netns_ctx { |
| 116 | struct llist_head entry; /* entry in g_netdev_netns_ctx_list */ |
| 117 | unsigned int refcount; /* Number of osmo_netdev currently registered on this netns */ |
| 118 | const char *netns_name; /* default netns has empty string "" (never NULL!) */ |
| 119 | int netns_fd; /* FD to the netns with name "netns_name" above */ |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 120 | #if ENABLE_LIBMNL |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 121 | struct osmo_mnl *omnl; |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 122 | #endif |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 123 | }; |
| 124 | |
| 125 | static struct netdev_netns_ctx *netdev_netns_ctx_alloc(void *ctx, const char *netns_name) |
| 126 | { |
| 127 | struct netdev_netns_ctx *netns_ctx; |
| 128 | OSMO_ASSERT(netns_name); |
| 129 | |
| 130 | netns_ctx = talloc_zero(ctx, struct netdev_netns_ctx); |
| 131 | if (!netns_ctx) |
| 132 | return NULL; |
| 133 | |
| 134 | netns_ctx->netns_name = talloc_strdup(netns_ctx, netns_name); |
| 135 | netns_ctx->netns_fd = -1; |
| 136 | |
| 137 | llist_add_tail(&netns_ctx->entry, &g_netdev_netns_ctx_list); |
| 138 | return netns_ctx; |
| 139 | |
| 140 | } |
| 141 | |
| 142 | static void netdev_netns_ctx_free(struct netdev_netns_ctx *netns_ctx) |
| 143 | { |
| 144 | if (!netns_ctx) |
| 145 | return; |
| 146 | |
| 147 | llist_del(&netns_ctx->entry); |
| 148 | |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 149 | #if ENABLE_LIBMNL |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 150 | if (netns_ctx->omnl) { |
| 151 | osmo_mnl_destroy(netns_ctx->omnl); |
| 152 | netns_ctx->omnl = NULL; |
| 153 | } |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 154 | #endif |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 155 | |
| 156 | if (netns_ctx->netns_fd != -1) { |
| 157 | close(netns_ctx->netns_fd); |
| 158 | netns_ctx->netns_fd = -1; |
| 159 | } |
| 160 | talloc_free(netns_ctx); |
| 161 | } |
| 162 | |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 163 | #if ENABLE_LIBMNL |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 164 | static int netdev_netns_ctx_mnl_cb(const struct nlmsghdr *nlh, void *data); |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 165 | #endif |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 166 | |
| 167 | static int netdev_netns_ctx_init(struct netdev_netns_ctx *netns_ctx) |
| 168 | { |
| 169 | struct osmo_netns_switch_state switch_state; |
| 170 | int rc; |
| 171 | |
| 172 | if (netns_ctx->netns_name[0] != '\0') { |
| 173 | LOGP(DLGLOBAL, LOGL_INFO, "Prepare netns: Switch to netns '%s'\n", netns_ctx->netns_name); |
| 174 | netns_ctx->netns_fd = osmo_netns_open_fd(netns_ctx->netns_name); |
| 175 | if (netns_ctx->netns_fd < 0) { |
| 176 | LOGP(DLGLOBAL, LOGL_ERROR, "Prepare netns: Cannot switch to netns '%s': %s (%d)\n", |
| 177 | netns_ctx->netns_name, strerror(errno), errno); |
| 178 | return netns_ctx->netns_fd; |
| 179 | } |
| 180 | |
| 181 | /* temporarily switch to specified namespace to create netlink socket */ |
| 182 | rc = osmo_netns_switch_enter(netns_ctx->netns_fd, &switch_state); |
| 183 | if (rc < 0) { |
| 184 | LOGP(DLGLOBAL, LOGL_ERROR, "Prepare netns: Cannot switch to netns '%s': %s (%d)\n", |
| 185 | netns_ctx->netns_name, strerror(errno), errno); |
| 186 | /* netns_ctx->netns_fd will be freed by future call to netdev_netns_ctx_free() */ |
| 187 | return rc; |
| 188 | } |
| 189 | } |
| 190 | |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 191 | #if ENABLE_LIBMNL |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 192 | netns_ctx->omnl = osmo_mnl_init(NULL, NETLINK_ROUTE, RTMGRP_LINK, netdev_netns_ctx_mnl_cb, netns_ctx); |
| 193 | rc = (netns_ctx->omnl ? 0 : -EFAULT); |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 194 | #else |
| 195 | rc = 0; |
| 196 | #endif |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 197 | |
| 198 | /* switch back to default namespace */ |
| 199 | if (netns_ctx->netns_name[0] != '\0') { |
| 200 | int rc2 = osmo_netns_switch_exit(&switch_state); |
| 201 | if (rc2 < 0) { |
| 202 | LOGP(DLGLOBAL, LOGL_ERROR, "Prepare netns: Cannot switch back from netns '%s': %s\n", |
| 203 | netns_ctx->netns_name, strerror(errno)); |
| 204 | return rc2; |
| 205 | } |
| 206 | LOGP(DLGLOBAL, LOGL_INFO, "Prepare netns: Back from netns '%s'\n", |
| 207 | netns_ctx->netns_name); |
| 208 | } |
| 209 | return rc; |
| 210 | } |
| 211 | |
| 212 | static struct netdev_netns_ctx *netdev_netns_ctx_find_by_netns_name(const char *netns_name) |
| 213 | { |
| 214 | struct netdev_netns_ctx *netns_ctx; |
| 215 | |
| 216 | llist_for_each_entry(netns_ctx, &g_netdev_netns_ctx_list, entry) { |
| 217 | if (strcmp(netns_ctx->netns_name, netns_name)) |
| 218 | continue; |
| 219 | return netns_ctx; |
| 220 | } |
| 221 | |
| 222 | return NULL; |
| 223 | } |
| 224 | |
| 225 | static struct netdev_netns_ctx *netdev_netns_ctx_get(const char *netns_name) |
| 226 | { |
| 227 | struct netdev_netns_ctx *netns_ctx; |
| 228 | int rc; |
| 229 | |
| 230 | OSMO_ASSERT(netns_name); |
| 231 | netns_ctx = netdev_netns_ctx_find_by_netns_name(netns_name); |
| 232 | if (!netns_ctx) { |
| 233 | netns_ctx = netdev_netns_ctx_alloc(NULL, netns_name); |
| 234 | if (!netns_ctx) |
| 235 | return NULL; |
| 236 | rc = netdev_netns_ctx_init(netns_ctx); |
| 237 | if (rc < 0) { |
| 238 | netdev_netns_ctx_free(netns_ctx); |
| 239 | return NULL; |
| 240 | } |
| 241 | } |
| 242 | netns_ctx->refcount++; |
| 243 | return netns_ctx; |
| 244 | } |
| 245 | |
| 246 | static void netdev_netns_ctx_put(struct netdev_netns_ctx *netns_ctx) |
| 247 | { |
| 248 | OSMO_ASSERT(netns_ctx); |
| 249 | netns_ctx->refcount--; |
| 250 | |
| 251 | if (netns_ctx->refcount == 0) |
| 252 | netdev_netns_ctx_free(netns_ctx); |
| 253 | } |
| 254 | |
| 255 | struct osmo_netdev { |
| 256 | /* entry in g_netdev_list */ |
| 257 | struct llist_head entry; |
| 258 | |
| 259 | /* Pointer to struct shared (refcounted) by all osmo_netdev in the same netns: */ |
| 260 | struct netdev_netns_ctx *netns_ctx; |
| 261 | |
| 262 | /* Name used to identify the osmo_netdev */ |
| 263 | char *name; |
| 264 | |
| 265 | /* ifindex of the network interface (address space is per netns) */ |
| 266 | unsigned int ifindex; |
| 267 | |
| 268 | /* Network interface name. Can change over lifetime of the interface. */ |
| 269 | char *dev_name; |
| 270 | |
| 271 | /* netns name where the netdev interface is created (NULL = default netns) */ |
| 272 | char *netns_name; |
| 273 | |
| 274 | /* API user private data */ |
| 275 | void *priv_data; |
| 276 | |
| 277 | /* Whether the netdev is in operation (managing the netdev interface) */ |
| 278 | bool registered; |
| 279 | |
| 280 | /* Called by netdev each time a new up/down state change is detected. Can be NULL. */ |
| 281 | osmo_netdev_ifupdown_ind_cb_t ifupdown_ind_cb; |
| 282 | |
| 283 | /* Called by netdev each time the registered network interface is renamed by the system. Can be NULL. */ |
| 284 | osmo_netdev_dev_name_chg_cb_t dev_name_chg_cb; |
| 285 | |
| 286 | /* Called by netdev each time the configured MTU changes in registered network interface. Can be NULL. */ |
| 287 | osmo_netdev_mtu_chg_cb_t mtu_chg_cb; |
| 288 | |
| 289 | /* Whether the netdev interface is UP */ |
| 290 | bool if_up; |
| 291 | /* Whether we know the interface updown state (aka if if_up holds information)*/ |
| 292 | bool if_up_known; |
| 293 | |
| 294 | /* The netdev interface MTU size */ |
| 295 | uint32_t if_mtu; |
| 296 | /* Whether we know the interface MTU size (aka if if_mtu holds information)*/ |
| 297 | bool if_mtu_known; |
| 298 | }; |
| 299 | |
| 300 | #define NETDEV_NETNS_ENTER(netdev, switch_state, str_prefix) \ |
| 301 | do { \ |
| 302 | if ((netdev)->netns_name) { \ |
| 303 | LOGNETDEV(netdev, LOGL_DEBUG, str_prefix ": Switch to netns '%s'\n", \ |
| 304 | (netdev)->netns_name); \ |
| 305 | int rc2 = osmo_netns_switch_enter((netdev)->netns_ctx->netns_fd, switch_state); \ |
| 306 | if (rc2 < 0) { \ |
| 307 | LOGNETDEV(netdev, LOGL_ERROR, str_prefix ": Cannot switch to netns '%s': %s (%d)\n", \ |
| 308 | (netdev)->netns_name, strerror(errno), errno); \ |
| 309 | return -EACCES; \ |
| 310 | } \ |
| 311 | } \ |
| 312 | } while (0) |
| 313 | |
| 314 | #define NETDEV_NETNS_EXIT(netdev, switch_state, str_prefix) \ |
| 315 | do { \ |
| 316 | if ((netdev)->netns_name) { \ |
| 317 | int rc2 = osmo_netns_switch_exit(switch_state); \ |
| 318 | if (rc2 < 0) { \ |
| 319 | LOGNETDEV(netdev, LOGL_ERROR, str_prefix ": Cannot switch back from netns '%s': %s\n", \ |
| 320 | (netdev)->netns_name, strerror(errno)); \ |
| 321 | return rc2; \ |
| 322 | } \ |
| 323 | LOGNETDEV(netdev, LOGL_DEBUG, str_prefix ": Back from netns '%s'\n", \ |
| 324 | (netdev)->netns_name); \ |
| 325 | } \ |
| 326 | } while (0) |
| 327 | |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 328 | #if ENABLE_LIBMNL |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 329 | /* validate the netlink attributes */ |
| 330 | static int netdev_mnl_data_attr_cb(const struct nlattr *attr, void *data) |
| 331 | { |
| 332 | const struct nlattr **tb = data; |
| 333 | int type = mnl_attr_get_type(attr); |
| 334 | |
| 335 | if (mnl_attr_type_valid(attr, IFLA_MAX) < 0) |
| 336 | return MNL_CB_OK; |
| 337 | |
| 338 | switch (type) { |
| 339 | case IFLA_ADDRESS: |
| 340 | if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0) |
| 341 | return MNL_CB_ERROR; |
| 342 | break; |
| 343 | case IFLA_MTU: |
| 344 | if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) |
| 345 | return MNL_CB_ERROR; |
| 346 | break; |
| 347 | case IFLA_IFNAME: |
| 348 | if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) |
| 349 | return MNL_CB_ERROR; |
| 350 | break; |
| 351 | } |
| 352 | tb[type] = attr; |
| 353 | return MNL_CB_OK; |
| 354 | } |
| 355 | |
| 356 | static void netdev_mnl_check_mtu_change(struct osmo_netdev *netdev, uint32_t mtu) |
| 357 | { |
| 358 | if (netdev->if_mtu_known && netdev->if_mtu == mtu) |
| 359 | return; |
| 360 | |
| 361 | LOGNETDEV(netdev, LOGL_NOTICE, "MTU changed: %u\n", mtu); |
| 362 | if (netdev->mtu_chg_cb) |
| 363 | netdev->mtu_chg_cb(netdev, mtu); |
| 364 | |
| 365 | netdev->if_mtu_known = true; |
| 366 | netdev->if_mtu = mtu; |
| 367 | } |
| 368 | |
| 369 | static void netdev_mnl_check_link_state_change(struct osmo_netdev *netdev, bool if_up) |
| 370 | { |
| 371 | if (netdev->if_up_known && netdev->if_up == if_up) |
| 372 | return; |
| 373 | |
| 374 | LOGNETDEV(netdev, LOGL_NOTICE, "Physical link state changed: %s\n", |
| 375 | if_up ? "UP" : "DOWN"); |
| 376 | if (netdev->ifupdown_ind_cb) |
| 377 | netdev->ifupdown_ind_cb(netdev, if_up); |
| 378 | |
| 379 | netdev->if_up_known = true; |
| 380 | netdev->if_up = if_up; |
| 381 | } |
| 382 | |
| 383 | static int netdev_mnl_cb(struct osmo_netdev *netdev, struct ifinfomsg *ifm, struct nlattr **tb) |
| 384 | { |
| 385 | char ifnamebuf[IF_NAMESIZE]; |
| 386 | const char *ifname = NULL; |
| 387 | bool if_running; |
| 388 | |
| 389 | if (tb[IFLA_IFNAME]) { |
| 390 | ifname = mnl_attr_get_str(tb[IFLA_IFNAME]); |
| 391 | LOGNETDEV(netdev, LOGL_DEBUG, "%s(): ifname=%s\n", __func__, ifname); |
| 392 | } else { |
| 393 | /* Try harder to obtain the ifname. This code path should in |
| 394 | * general not be triggered since usually IFLA_IFNAME is there */ |
| 395 | struct osmo_netns_switch_state switch_state; |
| 396 | NETDEV_NETNS_ENTER(netdev, &switch_state, "if_indextoname"); |
| 397 | ifname = if_indextoname(ifm->ifi_index, ifnamebuf); |
| 398 | NETDEV_NETNS_EXIT(netdev, &switch_state, "if_indextoname"); |
| 399 | } |
| 400 | if (ifname) { |
| 401 | /* Update dev_name if it changed: */ |
| 402 | if (strcmp(netdev->dev_name, ifname) != 0) { |
| 403 | if (netdev->dev_name_chg_cb) |
| 404 | netdev->dev_name_chg_cb(netdev, ifname); |
| 405 | osmo_talloc_replace_string(netdev, &netdev->dev_name, ifname); |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | if (tb[IFLA_MTU]) { |
| 410 | uint32_t mtu = mnl_attr_get_u32(tb[IFLA_MTU]); |
| 411 | LOGNETDEV(netdev, LOGL_DEBUG, "%s(): mtu=%u\n", __func__, mtu); |
| 412 | netdev_mnl_check_mtu_change(netdev, mtu); |
| 413 | } |
| 414 | if (tb[IFLA_ADDRESS]) { |
| 415 | uint8_t *hwaddr = mnl_attr_get_payload(tb[IFLA_ADDRESS]); |
| 416 | uint16_t hwaddr_len = mnl_attr_get_payload_len(tb[IFLA_ADDRESS]); |
| 417 | LOGNETDEV(netdev, LOGL_DEBUG, "%s(): hwaddress=%s\n", |
| 418 | __func__, osmo_hexdump(hwaddr, hwaddr_len)); |
| 419 | } |
| 420 | |
| 421 | if_running = !!(ifm->ifi_flags & IFF_RUNNING); |
| 422 | LOGNETDEV(netdev, LOGL_DEBUG, "%s(): up=%u running=%u\n", |
| 423 | __func__, !!(ifm->ifi_flags & IFF_UP), if_running); |
| 424 | netdev_mnl_check_link_state_change(netdev, if_running); |
| 425 | |
| 426 | return MNL_CB_OK; |
| 427 | } |
| 428 | |
| 429 | static int netdev_netns_ctx_mnl_cb(const struct nlmsghdr *nlh, void *data) |
| 430 | { |
| 431 | struct osmo_mnl *omnl = data; |
| 432 | struct netdev_netns_ctx *netns_ctx = (struct netdev_netns_ctx *)omnl->priv; |
| 433 | struct nlattr *tb[IFLA_MAX+1] = {}; |
| 434 | struct ifinfomsg *ifm = mnl_nlmsg_get_payload(nlh); |
| 435 | struct osmo_netdev *netdev; |
| 436 | |
| 437 | OSMO_ASSERT(omnl); |
| 438 | OSMO_ASSERT(ifm); |
| 439 | |
| 440 | mnl_attr_parse(nlh, sizeof(*ifm), netdev_mnl_data_attr_cb, tb); |
| 441 | |
| 442 | LOGP(DLGLOBAL, LOGL_DEBUG, |
| 443 | "%s(): index=%d type=%d flags=0x%x family=%d\n", __func__, |
| 444 | ifm->ifi_index, ifm->ifi_type, ifm->ifi_flags, ifm->ifi_family); |
| 445 | |
| 446 | if (ifm->ifi_index == IFINDEX_UNUSED) |
| 447 | return MNL_CB_ERROR; |
| 448 | |
| 449 | /* Find the netdev (if any) using key <netns,ifindex>. |
| 450 | * Different users of the API may have its own osmo_netdev object |
| 451 | * tracking potentially same netif, hence we need to iterate the whole list |
| 452 | * and dispatch to all matches: |
| 453 | */ |
| 454 | bool found_any = false; |
| 455 | llist_for_each_entry(netdev, &g_netdev_list, entry) { |
| 456 | if (!netdev->registered) |
| 457 | continue; |
| 458 | if (netdev->ifindex != ifm->ifi_index) |
| 459 | continue; |
| 460 | if (strcmp(netdev->netns_ctx->netns_name, netns_ctx->netns_name)) |
| 461 | continue; |
| 462 | found_any = true; |
| 463 | netdev_mnl_cb(netdev, ifm, &tb[0]); |
| 464 | } |
| 465 | |
| 466 | if (!found_any) { |
| 467 | LOGP(DLGLOBAL, LOGL_DEBUG, "%s(): device with ifindex %u on netns %s not registered\n", __func__, |
| 468 | ifm->ifi_index, netns_ctx->netns_name); |
| 469 | } |
| 470 | return MNL_CB_OK; |
| 471 | } |
| 472 | |
Pau Espin Pedrol | 5c7eaa6 | 2023-01-24 18:41:33 +0100 | [diff] [blame] | 473 | /* Trigger an initial dump of the iface to get link information */ |
| 474 | static int netdev_mnl_request_initial_dump(struct osmo_mnl *omnl, unsigned int if_index) |
| 475 | { |
| 476 | char buf[MNL_SOCKET_BUFFER_SIZE]; |
| 477 | struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf); |
| 478 | struct ifinfomsg *ifm; |
| 479 | |
| 480 | nlh->nlmsg_type = RTM_GETLINK; |
| 481 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
| 482 | nlh->nlmsg_seq = time(NULL); |
| 483 | |
| 484 | ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm)); |
| 485 | ifm->ifi_family = AF_UNSPEC; |
| 486 | ifm->ifi_index = if_index; |
| 487 | |
| 488 | if (mnl_socket_sendto(omnl->mnls, nlh, nlh->nlmsg_len) < 0) { |
| 489 | LOGP(DLGLOBAL, LOGL_ERROR, "mnl_socket_sendto\n"); |
| 490 | return -EIO; |
| 491 | } |
| 492 | |
| 493 | return 0; |
| 494 | } |
| 495 | |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 496 | static int netdev_mnl_set_ifupdown(struct osmo_mnl *omnl, unsigned int if_index, |
| 497 | const char *dev_name, bool up) |
| 498 | { |
| 499 | char buf[MNL_SOCKET_BUFFER_SIZE]; |
| 500 | struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf); |
| 501 | struct ifinfomsg *ifm; |
| 502 | unsigned int change = 0; |
| 503 | unsigned int flags = 0; |
| 504 | |
| 505 | if (up) { |
| 506 | change |= IFF_UP; |
| 507 | flags |= IFF_UP; |
| 508 | } else { |
| 509 | change |= IFF_UP; |
| 510 | flags &= ~IFF_UP; |
| 511 | } |
| 512 | |
| 513 | nlh->nlmsg_type = RTM_NEWLINK; |
| 514 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
| 515 | nlh->nlmsg_seq = time(NULL); |
| 516 | |
| 517 | ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm)); |
| 518 | ifm->ifi_family = AF_UNSPEC; |
| 519 | ifm->ifi_change = change; |
| 520 | ifm->ifi_flags = flags; |
| 521 | ifm->ifi_index = if_index; |
| 522 | |
| 523 | if (dev_name) |
| 524 | mnl_attr_put_str(nlh, IFLA_IFNAME, dev_name); |
| 525 | |
| 526 | if (mnl_socket_sendto(omnl->mnls, nlh, nlh->nlmsg_len) < 0) { |
| 527 | LOGP(DLGLOBAL, LOGL_ERROR, "mnl_socket_sendto\n"); |
| 528 | return -EIO; |
| 529 | } |
| 530 | |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | static int netdev_mnl_add_addr(struct osmo_mnl *omnl, unsigned int if_index, const struct osmo_sockaddr *osa, uint8_t prefix) |
| 535 | { |
| 536 | char buf[MNL_SOCKET_BUFFER_SIZE]; |
| 537 | struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf); |
| 538 | struct ifaddrmsg *ifm; |
| 539 | |
| 540 | nlh->nlmsg_type = RTM_NEWADDR; |
| 541 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_ACK; |
| 542 | nlh->nlmsg_seq = time(NULL); |
| 543 | |
| 544 | ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm)); |
| 545 | ifm->ifa_family = osa->u.sa.sa_family; |
| 546 | ifm->ifa_prefixlen = prefix; |
| 547 | ifm->ifa_flags = IFA_F_PERMANENT; |
| 548 | ifm->ifa_scope = RT_SCOPE_UNIVERSE; |
| 549 | ifm->ifa_index = if_index; |
| 550 | |
| 551 | /* |
| 552 | * The exact meaning of IFA_LOCAL and IFA_ADDRESS depend |
| 553 | * on the address family being used and the device type. |
| 554 | * For broadcast devices (like the interfaces we use), |
| 555 | * for IPv4 we specify both and they are used interchangeably. |
| 556 | * For IPv6, only IFA_ADDRESS needs to be set. |
| 557 | */ |
| 558 | switch (osa->u.sa.sa_family) { |
| 559 | case AF_INET: |
| 560 | mnl_attr_put_u32(nlh, IFA_LOCAL, osa->u.sin.sin_addr.s_addr); |
| 561 | mnl_attr_put_u32(nlh, IFA_ADDRESS, osa->u.sin.sin_addr.s_addr); |
| 562 | break; |
| 563 | case AF_INET6: |
| 564 | mnl_attr_put(nlh, IFA_ADDRESS, sizeof(struct in6_addr), &osa->u.sin6.sin6_addr); |
| 565 | break; |
| 566 | default: |
| 567 | return -EINVAL; |
| 568 | } |
| 569 | |
| 570 | if (mnl_socket_sendto(omnl->mnls, nlh, nlh->nlmsg_len) < 0) { |
| 571 | LOGP(DLGLOBAL, LOGL_ERROR, "mnl_socket_sendto\n"); |
| 572 | return -EIO; |
| 573 | } |
| 574 | |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | static int netdev_mnl_add_route(struct osmo_mnl *omnl, |
| 579 | unsigned int if_index, |
| 580 | const struct osmo_sockaddr *dst_osa, |
| 581 | uint8_t dst_prefix, |
| 582 | const struct osmo_sockaddr *gw_osa) |
| 583 | { |
| 584 | char buf[MNL_SOCKET_BUFFER_SIZE]; |
| 585 | struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf); |
| 586 | struct rtmsg *rtm; |
| 587 | |
| 588 | nlh->nlmsg_type = RTM_NEWROUTE; |
| 589 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK; |
| 590 | nlh->nlmsg_seq = time(NULL); |
| 591 | |
| 592 | rtm = mnl_nlmsg_put_extra_header(nlh, sizeof(*rtm)); |
| 593 | rtm->rtm_family = dst_osa->u.sa.sa_family; |
| 594 | rtm->rtm_dst_len = dst_prefix; |
| 595 | rtm->rtm_src_len = 0; |
| 596 | rtm->rtm_tos = 0; |
| 597 | rtm->rtm_protocol = RTPROT_STATIC; |
| 598 | rtm->rtm_table = RT_TABLE_MAIN; |
| 599 | rtm->rtm_type = RTN_UNICAST; |
| 600 | rtm->rtm_scope = gw_osa ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK; |
| 601 | rtm->rtm_flags = 0; |
| 602 | |
| 603 | switch (dst_osa->u.sa.sa_family) { |
| 604 | case AF_INET: |
| 605 | mnl_attr_put_u32(nlh, RTA_DST, dst_osa->u.sin.sin_addr.s_addr); |
| 606 | break; |
| 607 | case AF_INET6: |
| 608 | mnl_attr_put(nlh, RTA_DST, sizeof(struct in6_addr), &dst_osa->u.sin6.sin6_addr); |
| 609 | break; |
| 610 | default: |
| 611 | return -EINVAL; |
| 612 | } |
| 613 | |
| 614 | mnl_attr_put_u32(nlh, RTA_OIF, if_index); |
| 615 | |
| 616 | if (gw_osa) { |
| 617 | switch (gw_osa->u.sa.sa_family) { |
| 618 | case AF_INET: |
| 619 | mnl_attr_put_u32(nlh, RTA_GATEWAY, gw_osa->u.sin.sin_addr.s_addr); |
| 620 | break; |
| 621 | case AF_INET6: |
| 622 | mnl_attr_put(nlh, RTA_GATEWAY, sizeof(struct in6_addr), &gw_osa->u.sin6.sin6_addr); |
| 623 | break; |
| 624 | default: |
| 625 | return -EINVAL; |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | if (mnl_socket_sendto(omnl->mnls, nlh, nlh->nlmsg_len) < 0) { |
| 630 | LOGP(DLGLOBAL, LOGL_ERROR, "mnl_socket_sendto\n"); |
| 631 | return -EIO; |
| 632 | } |
| 633 | |
| 634 | return 0; |
| 635 | } |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 636 | #endif /* if ENABLE_LIBMNL */ |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 637 | |
| 638 | /*! Allocate a new netdev object. |
| 639 | * \param[in] ctx talloc context to use as a parent when allocating the netdev object |
| 640 | * \param[in] name A name providen to identify the netdev object |
| 641 | * \returns newly allocated netdev object on success; NULL on error |
| 642 | */ |
| 643 | struct osmo_netdev *osmo_netdev_alloc(void *ctx, const char *name) |
| 644 | { |
| 645 | struct osmo_netdev *netdev; |
| 646 | |
| 647 | netdev = talloc_zero(ctx, struct osmo_netdev); |
| 648 | if (!netdev) |
| 649 | return NULL; |
| 650 | |
| 651 | netdev->name = talloc_strdup(netdev, name); |
| 652 | |
| 653 | llist_add_tail(&netdev->entry, &g_netdev_list); |
| 654 | return netdev; |
| 655 | } |
| 656 | |
| 657 | /*! Free an allocated netdev object. |
| 658 | * \param[in] netdev The netdev object to free |
| 659 | */ |
| 660 | void osmo_netdev_free(struct osmo_netdev *netdev) |
| 661 | { |
| 662 | if (!netdev) |
| 663 | return; |
| 664 | if (osmo_netdev_is_registered(netdev)) |
| 665 | osmo_netdev_unregister(netdev); |
| 666 | llist_del(&netdev->entry); |
| 667 | talloc_free(netdev); |
| 668 | } |
| 669 | |
| 670 | /*! Start managing the network device referenced by the netdev object. |
| 671 | * \param[in] netdev The netdev object to open |
| 672 | * \returns 0 on success; negative on error |
| 673 | */ |
| 674 | int osmo_netdev_register(struct osmo_netdev *netdev) |
| 675 | { |
| 676 | char ifnamebuf[IF_NAMESIZE]; |
| 677 | struct osmo_netns_switch_state switch_state; |
| 678 | int rc = 0; |
| 679 | |
| 680 | if (netdev->registered) |
| 681 | return -EALREADY; |
| 682 | |
| 683 | netdev->netns_ctx = netdev_netns_ctx_get(netdev->netns_name ? : ""); |
| 684 | if (!netdev->netns_ctx) |
| 685 | return -EFAULT; |
| 686 | |
| 687 | NETDEV_NETNS_ENTER(netdev, &switch_state, "register"); |
| 688 | |
| 689 | if (!if_indextoname(netdev->ifindex, ifnamebuf)) { |
| 690 | rc = -ENODEV; |
| 691 | goto err_put_exit; |
| 692 | } |
| 693 | osmo_talloc_replace_string(netdev, &netdev->dev_name, ifnamebuf); |
| 694 | |
Pau Espin Pedrol | 5c7eaa6 | 2023-01-24 18:41:33 +0100 | [diff] [blame] | 695 | #if ENABLE_LIBMNL |
| 696 | rc = netdev_mnl_request_initial_dump(netdev->netns_ctx->omnl, netdev->ifindex); |
| 697 | #endif |
| 698 | |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 699 | NETDEV_NETNS_EXIT(netdev, &switch_state, "register"); |
| 700 | |
| 701 | netdev->registered = true; |
| 702 | return rc; |
| 703 | |
| 704 | err_put_exit: |
| 705 | NETDEV_NETNS_EXIT(netdev, &switch_state, "register"); |
| 706 | netdev_netns_ctx_put(netdev->netns_ctx); |
| 707 | return rc; |
| 708 | } |
| 709 | |
| 710 | /*! Unregister the netdev object (stop managing /moniutoring the interface) |
| 711 | * \param[in] netdev The netdev object to close |
| 712 | * \returns 0 on success; negative on error |
| 713 | */ |
| 714 | int osmo_netdev_unregister(struct osmo_netdev *netdev) |
| 715 | { |
| 716 | if (!netdev->registered) |
| 717 | return -EALREADY; |
| 718 | |
| 719 | netdev->if_up_known = false; |
| 720 | netdev->if_mtu_known = false; |
| 721 | |
| 722 | netdev_netns_ctx_put(netdev->netns_ctx); |
| 723 | netdev->registered = false; |
| 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | /*! Retrieve whether the netdev object is in "registered" state. |
| 728 | * \param[in] netdev The netdev object to check |
| 729 | * \returns true if in state "registered"; false otherwise |
| 730 | */ |
| 731 | bool osmo_netdev_is_registered(struct osmo_netdev *netdev) |
| 732 | { |
| 733 | return netdev->registered; |
| 734 | } |
| 735 | |
| 736 | /*! Set private user data pointer on the netdev object. |
| 737 | * \param[in] netdev The netdev object where the field is set |
| 738 | */ |
| 739 | void osmo_netdev_set_priv_data(struct osmo_netdev *netdev, void *priv_data) |
| 740 | { |
| 741 | netdev->priv_data = priv_data; |
| 742 | } |
| 743 | |
| 744 | /*! Get private user data pointer from the netdev object. |
| 745 | * \param[in] netdev The netdev object from where to retrieve the field |
| 746 | * \returns The current value of the priv_data field. |
| 747 | */ |
| 748 | void *osmo_netdev_get_priv_data(struct osmo_netdev *netdev) |
| 749 | { |
| 750 | return netdev->priv_data; |
| 751 | } |
| 752 | |
| 753 | /*! Set data_ind_cb callback, called when a new packet is received on the network interface. |
| 754 | * \param[in] netdev The netdev object where the field is set |
| 755 | * \param[in] data_ind_cb the user provided function to be called when the link status (UP/DOWN) changes |
| 756 | */ |
| 757 | void osmo_netdev_set_ifupdown_ind_cb(struct osmo_netdev *netdev, osmo_netdev_ifupdown_ind_cb_t ifupdown_ind_cb) |
| 758 | { |
| 759 | netdev->ifupdown_ind_cb = ifupdown_ind_cb; |
| 760 | } |
| 761 | |
| 762 | /*! Set dev_name_chg_cb callback, called when a change in the network name is detected |
| 763 | * \param[in] netdev The netdev object where the field is set |
| 764 | * \param[in] dev_name_chg_cb the user provided function to be called when a the interface is renamed |
| 765 | */ |
| 766 | void osmo_netdev_set_dev_name_chg_cb(struct osmo_netdev *netdev, osmo_netdev_dev_name_chg_cb_t dev_name_chg_cb) |
| 767 | { |
| 768 | netdev->dev_name_chg_cb = dev_name_chg_cb; |
| 769 | } |
| 770 | |
| 771 | /*! Set mtu_chg_cb callback, called when a change in the network name is detected |
| 772 | * \param[in] netdev The netdev object where the field is set |
| 773 | * \param[in] mtu_chg_cb the user provided function to be called when the configured MTU at the interface changes |
| 774 | */ |
| 775 | void osmo_netdev_set_mtu_chg_cb(struct osmo_netdev *netdev, osmo_netdev_mtu_chg_cb_t mtu_chg_cb) |
| 776 | { |
| 777 | netdev->mtu_chg_cb = mtu_chg_cb; |
| 778 | } |
| 779 | |
| 780 | /*! Get name used to identify the netdev object. |
| 781 | * \param[in] netdev The netdev object from where to retrieve the field |
| 782 | * \returns The current value of the name used to identify the netdev object |
| 783 | */ |
| 784 | const char *osmo_netdev_get_name(const struct osmo_netdev *netdev) |
| 785 | { |
| 786 | return netdev->name; |
| 787 | } |
| 788 | |
| 789 | /*! Set (specify) interface index identifying the network interface to manage |
| 790 | * \param[in] netdev The netdev object where the field is set |
| 791 | * \param[in] ifindex The interface index identifying the interface |
| 792 | * \returns 0 on success; negative on error |
| 793 | * |
| 794 | * The ifindex, together with the netns_name (see |
| 795 | * osmo_netdev_netns_name_set()), form together the key identifiers of a |
| 796 | * network interface to manage. |
| 797 | * This field is used during osmo_netdev_register() time, and hence must be set |
| 798 | * before calling that API, and cannot be changed when the netdev object is in |
| 799 | * "registered" state. |
| 800 | */ |
| 801 | int osmo_netdev_set_ifindex(struct osmo_netdev *netdev, unsigned int ifindex) |
| 802 | { |
| 803 | if (netdev->registered) |
| 804 | return -EALREADY; |
| 805 | netdev->ifindex = ifindex; |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | /*! Get interface index identifying the interface managed by netdev |
| 810 | * \param[in] netdev The netdev object from where to retrieve the field |
| 811 | * \returns The current value of the configured netdev interface ifindex to use (0 = unset) |
| 812 | */ |
| 813 | unsigned int osmo_netdev_get_ifindex(const struct osmo_netdev *netdev) |
| 814 | { |
| 815 | return netdev->ifindex; |
| 816 | } |
| 817 | |
| 818 | /*! Set (specify) name of the network namespace where the network interface to manage is located |
| 819 | * \param[in] netdev The netdev object where the field is set |
| 820 | * \param[in] netns_name The network namespace where the network interface is located |
| 821 | * \returns 0 on success; negative on error |
| 822 | * |
| 823 | * The netns_name, together with the ifindex (see |
| 824 | * osmo_netdev_ifindex_set()), form together the key identifiers of a |
| 825 | * network interface to manage. |
| 826 | * This field is used during osmo_netdev_register() time, and hence must be set |
| 827 | * before calling that API, and cannot be changed when the netdev object is in |
| 828 | * "registered" state. |
| 829 | * If left as NULL (default), the management will be done in the current network namespace. |
| 830 | */ |
| 831 | int osmo_netdev_set_netns_name(struct osmo_netdev *netdev, const char *netns_name) |
| 832 | { |
| 833 | if (netdev->registered) |
| 834 | return -EALREADY; |
| 835 | osmo_talloc_replace_string(netdev, &netdev->netns_name, netns_name); |
| 836 | return 0; |
| 837 | } |
| 838 | |
| 839 | /*! Get name of network namespace used when opening the netdev interface |
| 840 | * \param[in] netdev The netdev object from where to retrieve the field |
| 841 | * \returns The current value of the configured network namespace |
| 842 | */ |
| 843 | const char *osmo_netdev_get_netns_name(const struct osmo_netdev *netdev) |
| 844 | { |
| 845 | return netdev->netns_name; |
| 846 | } |
| 847 | |
| 848 | /*! Get name used to name the network interface created by the netdev object |
| 849 | * \param[in] netdev The netdev object from where to retrieve the field |
| 850 | * \returns The interface name (or NULL if unknown) |
| 851 | * |
| 852 | * This information is retrieved internally once the netdev object enters the |
| 853 | * "registered" state. Hence, when not registered NULL can be returned. |
| 854 | */ |
| 855 | const char *osmo_netdev_get_dev_name(const struct osmo_netdev *netdev) |
| 856 | { |
| 857 | return netdev->dev_name; |
| 858 | } |
| 859 | |
| 860 | /*! Bring netdev interface UP or DOWN. |
| 861 | * \param[in] netdev The netdev object managing the netdev interface |
| 862 | * \param[in] ifupdown true to set the interface UP, false to set it DOWN |
| 863 | * \returns 0 on succes; negative on error. |
| 864 | */ |
| 865 | int osmo_netdev_ifupdown(struct osmo_netdev *netdev, bool ifupdown) |
| 866 | { |
| 867 | struct osmo_netns_switch_state switch_state; |
| 868 | int rc; |
| 869 | |
| 870 | if (!netdev->registered) |
| 871 | return -ENODEV; |
| 872 | |
| 873 | LOGNETDEV(netdev, LOGL_NOTICE, "Bringing dev %s %s\n", |
| 874 | netdev->dev_name, ifupdown ? "UP" : "DOWN"); |
| 875 | |
| 876 | NETDEV_NETNS_ENTER(netdev, &switch_state, "ifupdown"); |
| 877 | |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 878 | #if ENABLE_LIBMNL |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 879 | rc = netdev_mnl_set_ifupdown(netdev->netns_ctx->omnl, netdev->ifindex, |
| 880 | netdev->dev_name, ifupdown); |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 881 | #else |
| 882 | LOGNETDEV(netdev, LOGL_ERROR, "%s: NOT SUPPORTED. Build libosmocore with --enable-libmnl.\n", __func__); |
| 883 | rc = -ENOTSUP; |
| 884 | #endif |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 885 | |
| 886 | NETDEV_NETNS_EXIT(netdev, &switch_state, "ifupdown"); |
| 887 | |
| 888 | return rc; |
| 889 | } |
| 890 | |
| 891 | /*! Add IP address to netdev interface |
| 892 | * \param[in] netdev The netdev object managing the netdev interface |
| 893 | * \param[in] addr The local address to set on the interface |
| 894 | * \param[in] prefixlen The network prefix of addr |
| 895 | * \returns 0 on succes; negative on error. |
| 896 | */ |
| 897 | int osmo_netdev_add_addr(struct osmo_netdev *netdev, const struct osmo_sockaddr *addr, uint8_t prefixlen) |
| 898 | { |
| 899 | struct osmo_netns_switch_state switch_state; |
| 900 | char buf[INET6_ADDRSTRLEN]; |
| 901 | int rc; |
| 902 | |
| 903 | if (!netdev->registered) |
| 904 | return -ENODEV; |
| 905 | |
| 906 | LOGNETDEV(netdev, LOGL_NOTICE, "Adding address %s/%u to dev %s\n", |
| 907 | osmo_sockaddr_ntop(&addr->u.sa, buf), prefixlen, netdev->dev_name); |
| 908 | |
| 909 | NETDEV_NETNS_ENTER(netdev, &switch_state, "Add address"); |
| 910 | |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 911 | #if ENABLE_LIBMNL |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 912 | rc = netdev_mnl_add_addr(netdev->netns_ctx->omnl, netdev->ifindex, addr, prefixlen); |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 913 | #else |
| 914 | LOGNETDEV(netdev, LOGL_ERROR, "%s: NOT SUPPORTED. Build libosmocore with --enable-libmnl.\n", __func__); |
| 915 | rc = -ENOTSUP; |
| 916 | #endif |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 917 | |
| 918 | NETDEV_NETNS_EXIT(netdev, &switch_state, "Add address"); |
| 919 | |
| 920 | return rc; |
| 921 | } |
| 922 | |
| 923 | /*! Add IP route to netdev interface |
| 924 | * \param[in] netdev The netdev object managing the netdev interface |
| 925 | * \param[in] dst_addr The destination address of the route |
| 926 | * \param[in] dst_prefixlen The network prefix of dst_addr |
| 927 | * \param[in] gw_addr The gateway address. Optional, can be NULL. |
| 928 | * \returns 0 on succes; negative on error. |
| 929 | */ |
| 930 | int osmo_netdev_add_route(struct osmo_netdev *netdev, const struct osmo_sockaddr *dst_addr, uint8_t dst_prefixlen, const struct osmo_sockaddr *gw_addr) |
| 931 | { |
| 932 | struct osmo_netns_switch_state switch_state; |
| 933 | char buf_dst[INET6_ADDRSTRLEN]; |
| 934 | char buf_gw[INET6_ADDRSTRLEN]; |
| 935 | int rc; |
| 936 | |
| 937 | if (!netdev->registered) |
| 938 | return -ENODEV; |
| 939 | |
| 940 | LOGNETDEV(netdev, LOGL_NOTICE, "Adding route %s/%u%s%s dev %s\n", |
| 941 | osmo_sockaddr_ntop(&dst_addr->u.sa, buf_dst), dst_prefixlen, |
| 942 | gw_addr ? " via " : "", |
| 943 | gw_addr ? osmo_sockaddr_ntop(&gw_addr->u.sa, buf_gw) : "", |
| 944 | netdev->dev_name); |
| 945 | |
| 946 | NETDEV_NETNS_ENTER(netdev, &switch_state, "Add route"); |
| 947 | |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 948 | #if ENABLE_LIBMNL |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 949 | rc = netdev_mnl_add_route(netdev->netns_ctx->omnl, netdev->ifindex, dst_addr, dst_prefixlen, gw_addr); |
Pau Espin Pedrol | 7d79fa4 | 2023-01-25 16:52:01 +0100 | [diff] [blame] | 950 | #else |
| 951 | LOGNETDEV(netdev, LOGL_ERROR, "%s: NOT SUPPORTED. Build libosmocore with --enable-libmnl.\n", __func__); |
| 952 | rc = -ENOTSUP; |
| 953 | #endif |
Pau Espin Pedrol | 9d0321d | 2023-01-24 17:33:06 +0100 | [diff] [blame] | 954 | |
| 955 | NETDEV_NETNS_EXIT(netdev, &switch_state, "Add route"); |
| 956 | |
| 957 | return rc; |
| 958 | } |
| 959 | |
| 960 | #endif /* (!EMBEDDED) */ |
| 961 | |
| 962 | /*! @} */ |