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Diffstat (limited to '')
| -rw-r--r-- | lib/vrf.c | 1041 |
1 files changed, 1041 insertions, 0 deletions
diff --git a/lib/vrf.c b/lib/vrf.c new file mode 100644 index 0000000..5878c17 --- /dev/null +++ b/lib/vrf.c @@ -0,0 +1,1041 @@ +/* + * VRF functions. + * Copyright (C) 2014 6WIND S.A. + * + * This file is part of GNU Zebra. + * + * GNU Zebra is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published + * by the Free Software Foundation; either version 2, or (at your + * option) any later version. + * + * GNU Zebra 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 General Public License along + * with this program; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <zebra.h> + +#include "if.h" +#include "vrf.h" +#include "vrf_int.h" +#include "prefix.h" +#include "table.h" +#include "log.h" +#include "memory.h" +#include "command.h" +#include "ns.h" +#include "privs.h" +#include "nexthop_group.h" +#include "lib_errors.h" +#include "northbound.h" +#include "northbound_cli.h" + +/* default VRF name value used when VRF backend is not NETNS */ +#define VRF_DEFAULT_NAME_INTERNAL "default" + +DEFINE_MTYPE_STATIC(LIB, VRF, "VRF"); +DEFINE_MTYPE_STATIC(LIB, VRF_BITMAP, "VRF bit-map"); + +DEFINE_QOBJ_TYPE(vrf); + +static __inline int vrf_id_compare(const struct vrf *, const struct vrf *); +static __inline int vrf_name_compare(const struct vrf *, const struct vrf *); + +RB_GENERATE(vrf_id_head, vrf, id_entry, vrf_id_compare); +RB_GENERATE(vrf_name_head, vrf, name_entry, vrf_name_compare); + +struct vrf_id_head vrfs_by_id = RB_INITIALIZER(&vrfs_by_id); +struct vrf_name_head vrfs_by_name = RB_INITIALIZER(&vrfs_by_name); + +static int vrf_backend; +static int vrf_backend_configured; +static char vrf_default_name[VRF_NAMSIZ] = VRF_DEFAULT_NAME_INTERNAL; + +/* + * Turn on/off debug code + * for vrf. + */ +static int debug_vrf = 0; + +/* Holding VRF hooks */ +static struct vrf_master { + int (*vrf_new_hook)(struct vrf *); + int (*vrf_delete_hook)(struct vrf *); + int (*vrf_enable_hook)(struct vrf *); + int (*vrf_disable_hook)(struct vrf *); +} vrf_master = { + 0, +}; + +static int vrf_is_enabled(struct vrf *vrf); + +/* VRF list existance check by name. */ +struct vrf *vrf_lookup_by_name(const char *name) +{ + struct vrf vrf; + strlcpy(vrf.name, name, sizeof(vrf.name)); + return (RB_FIND(vrf_name_head, &vrfs_by_name, &vrf)); +} + +static __inline int vrf_id_compare(const struct vrf *a, const struct vrf *b) +{ + return (a->vrf_id - b->vrf_id); +} + +static int vrf_name_compare(const struct vrf *a, const struct vrf *b) +{ + return strcmp(a->name, b->name); +} + +int vrf_switch_to_netns(vrf_id_t vrf_id) +{ + char *name; + struct vrf *vrf = vrf_lookup_by_id(vrf_id); + + /* VRF is default VRF. silently ignore */ + if (!vrf || vrf->vrf_id == VRF_DEFAULT) + return 1; /* 1 = default */ + /* VRF has no NETNS backend. silently ignore */ + if (vrf->data.l.netns_name[0] == '\0') + return 2; /* 2 = no netns */ + name = ns_netns_pathname(NULL, vrf->data.l.netns_name); + if (debug_vrf) + zlog_debug("VRF_SWITCH: %s(%u)", name, vrf->vrf_id); + return ns_switch_to_netns(name); +} + +int vrf_switchback_to_initial(void) +{ + int ret = ns_switchback_to_initial(); + + if (ret == 0 && debug_vrf) + zlog_debug("VRF_SWITCHBACK"); + return ret; +} + +/* Get a VRF. If not found, create one. + * Arg: + * name - The name of the vrf. May be NULL if unknown. + * vrf_id - The vrf_id of the vrf. May be VRF_UNKNOWN if unknown + * Description: Please note that this routine can be called with just the name + * and 0 vrf-id + */ +struct vrf *vrf_get(vrf_id_t vrf_id, const char *name) +{ + struct vrf *vrf = NULL; + int new = 0; + + /* Nothing to see, move along here */ + if (!name && vrf_id == VRF_UNKNOWN) + return NULL; + + /* attempt to find already available VRF + */ + if (name) + vrf = vrf_lookup_by_name(name); + if (vrf && vrf_id != VRF_UNKNOWN + && vrf->vrf_id != VRF_UNKNOWN + && vrf->vrf_id != vrf_id) { + zlog_debug("VRF_GET: avoid %s creation(%u), same name exists (%u)", + name, vrf_id, vrf->vrf_id); + return NULL; + } + /* Try to find VRF both by ID and name */ + if (!vrf && vrf_id != VRF_UNKNOWN) + vrf = vrf_lookup_by_id(vrf_id); + + if (vrf == NULL) { + vrf = XCALLOC(MTYPE_VRF, sizeof(struct vrf)); + vrf->vrf_id = VRF_UNKNOWN; + QOBJ_REG(vrf, vrf); + new = 1; + + if (debug_vrf) + zlog_debug("VRF(%u) %s is created.", vrf_id, + (name) ? name : "(NULL)"); + } + + /* Set identifier */ + if (vrf_id != VRF_UNKNOWN && vrf->vrf_id == VRF_UNKNOWN) { + vrf->vrf_id = vrf_id; + RB_INSERT(vrf_id_head, &vrfs_by_id, vrf); + } + + /* Set name */ + if (name && vrf->name[0] != '\0' && strcmp(name, vrf->name)) { + /* update the vrf name */ + RB_REMOVE(vrf_name_head, &vrfs_by_name, vrf); + strlcpy(vrf->data.l.netns_name, + name, NS_NAMSIZ); + strlcpy(vrf->name, name, sizeof(vrf->name)); + RB_INSERT(vrf_name_head, &vrfs_by_name, vrf); + } else if (name && vrf->name[0] == '\0') { + strlcpy(vrf->name, name, sizeof(vrf->name)); + RB_INSERT(vrf_name_head, &vrfs_by_name, vrf); + } + if (new &&vrf_master.vrf_new_hook) + (*vrf_master.vrf_new_hook)(vrf); + + return vrf; +} + +/* Update a VRF. If not found, create one. + * Arg: + * name - The name of the vrf. + * vrf_id - The vrf_id of the vrf. + * Description: This function first finds the vrf using its name. If the vrf is + * found and the vrf-id of the existing vrf does not match the new vrf id, it + * will disable the existing vrf and update it with new vrf-id. If the vrf is + * not found, it will create the vrf with given name and the new vrf id. + */ +struct vrf *vrf_update(vrf_id_t new_vrf_id, const char *name) +{ + struct vrf *vrf = NULL; + + /*Treat VRF add for existing vrf as update + * Update VRF ID and also update in VRF ID table + */ + if (name) + vrf = vrf_lookup_by_name(name); + if (vrf && new_vrf_id != VRF_UNKNOWN && vrf->vrf_id != VRF_UNKNOWN + && vrf->vrf_id != new_vrf_id) { + if (debug_vrf) { + zlog_debug( + "Vrf Update event: %s old id: %u, new id: %u", + name, vrf->vrf_id, new_vrf_id); + } + + /*Disable the vrf to simulate implicit delete + * so that all stale routes are deleted + * This vrf will be enabled down the line + */ + vrf_disable(vrf); + + + RB_REMOVE(vrf_id_head, &vrfs_by_id, vrf); + vrf->vrf_id = new_vrf_id; + RB_INSERT(vrf_id_head, &vrfs_by_id, vrf); + + } else { + + /* + * vrf_get is implied creation if it does not exist + */ + vrf = vrf_get(new_vrf_id, name); + } + return vrf; +} + +/* Delete a VRF. This is called when the underlying VRF goes away, a + * pre-configured VRF is deleted or when shutting down (vrf_terminate()). + */ +void vrf_delete(struct vrf *vrf) +{ + if (debug_vrf) + zlog_debug("VRF %s(%u) is to be deleted.", vrf->name, + vrf->vrf_id); + + if (vrf_is_enabled(vrf)) + vrf_disable(vrf); + + if (vrf->vrf_id != VRF_UNKNOWN) { + RB_REMOVE(vrf_id_head, &vrfs_by_id, vrf); + vrf->vrf_id = VRF_UNKNOWN; + } + + /* If the VRF is user configured, it'll stick around, just remove + * the ID mapping. Interfaces assigned to this VRF should've been + * removed already as part of the VRF going down. + */ + if (vrf_is_user_cfged(vrf)) + return; + + /* Do not delete the VRF if it has interfaces configured in it. */ + if (!RB_EMPTY(if_name_head, &vrf->ifaces_by_name)) + return; + + if (vrf_master.vrf_delete_hook) + (*vrf_master.vrf_delete_hook)(vrf); + + QOBJ_UNREG(vrf); + + if (vrf->name[0] != '\0') + RB_REMOVE(vrf_name_head, &vrfs_by_name, vrf); + + XFREE(MTYPE_VRF, vrf); +} + +/* Look up a VRF by identifier. */ +struct vrf *vrf_lookup_by_id(vrf_id_t vrf_id) +{ + struct vrf vrf; + vrf.vrf_id = vrf_id; + return (RB_FIND(vrf_id_head, &vrfs_by_id, &vrf)); +} + +/* + * Enable a VRF - that is, let the VRF be ready to use. + * The VRF_ENABLE_HOOK callback will be called to inform + * that they can allocate resources in this VRF. + * + * RETURN: 1 - enabled successfully; otherwise, 0. + */ +int vrf_enable(struct vrf *vrf) +{ + if (vrf_is_enabled(vrf)) + return 1; + + if (debug_vrf) + zlog_debug("VRF %s(%u) is enabled.", vrf->name, vrf->vrf_id); + + SET_FLAG(vrf->status, VRF_ACTIVE); + + if (vrf_master.vrf_enable_hook) + (*vrf_master.vrf_enable_hook)(vrf); + + /* + * If we have any nexthop group entries that + * are awaiting vrf initialization then + * let's let people know about it + */ + nexthop_group_enable_vrf(vrf); + + return 1; +} + +/* + * Disable a VRF - that is, let the VRF be unusable. + * The VRF_DELETE_HOOK callback will be called to inform + * that they must release the resources in the VRF. + */ +void vrf_disable(struct vrf *vrf) +{ + if (!vrf_is_enabled(vrf)) + return; + + UNSET_FLAG(vrf->status, VRF_ACTIVE); + + if (debug_vrf) + zlog_debug("VRF %s(%u) is to be disabled.", vrf->name, + vrf->vrf_id); + + /* Till now, nothing to be done for the default VRF. */ + // Pending: see why this statement. + + + /* + * When the vrf is disabled let's + * handle all nexthop-groups associated + * with this vrf + */ + nexthop_group_disable_vrf(vrf); + + if (vrf_master.vrf_disable_hook) + (*vrf_master.vrf_disable_hook)(vrf); +} + +const char *vrf_id_to_name(vrf_id_t vrf_id) +{ + struct vrf *vrf; + + if (vrf_id == VRF_DEFAULT) + return VRF_DEFAULT_NAME; + + vrf = vrf_lookup_by_id(vrf_id); + return VRF_LOGNAME(vrf); +} + +/* Look up the data pointer of the specified VRF. */ +void *vrf_info_lookup(vrf_id_t vrf_id) +{ + struct vrf *vrf = vrf_lookup_by_id(vrf_id); + return vrf ? vrf->info : NULL; +} + +/* + * VRF hash for storing set or not. + */ +struct vrf_bit_set { + vrf_id_t vrf_id; + bool set; +}; + +static unsigned int vrf_hash_bitmap_key(const void *data) +{ + const struct vrf_bit_set *bit = data; + + return bit->vrf_id; +} + +static bool vrf_hash_bitmap_cmp(const void *a, const void *b) +{ + const struct vrf_bit_set *bit1 = a; + const struct vrf_bit_set *bit2 = b; + + return bit1->vrf_id == bit2->vrf_id; +} + +static void *vrf_hash_bitmap_alloc(void *data) +{ + struct vrf_bit_set *copy = data; + struct vrf_bit_set *bit; + + bit = XMALLOC(MTYPE_VRF_BITMAP, sizeof(*bit)); + bit->vrf_id = copy->vrf_id; + + return bit; +} + +static void vrf_hash_bitmap_free(void *data) +{ + struct vrf_bit_set *bit = data; + + XFREE(MTYPE_VRF_BITMAP, bit); +} + +vrf_bitmap_t vrf_bitmap_init(void) +{ + return hash_create_size(32, vrf_hash_bitmap_key, vrf_hash_bitmap_cmp, + "VRF BIT HASH"); +} + +void vrf_bitmap_free(vrf_bitmap_t bmap) +{ + struct hash *vrf_hash = bmap; + + if (vrf_hash == NULL) + return; + + hash_clean(vrf_hash, vrf_hash_bitmap_free); + hash_free(vrf_hash); +} + +void vrf_bitmap_set(vrf_bitmap_t bmap, vrf_id_t vrf_id) +{ + struct vrf_bit_set lookup = { .vrf_id = vrf_id }; + struct hash *vrf_hash = bmap; + struct vrf_bit_set *bit; + + if (vrf_hash == NULL || vrf_id == VRF_UNKNOWN) + return; + + bit = hash_get(vrf_hash, &lookup, vrf_hash_bitmap_alloc); + bit->set = true; +} + +void vrf_bitmap_unset(vrf_bitmap_t bmap, vrf_id_t vrf_id) +{ + struct vrf_bit_set lookup = { .vrf_id = vrf_id }; + struct hash *vrf_hash = bmap; + struct vrf_bit_set *bit; + + if (vrf_hash == NULL || vrf_id == VRF_UNKNOWN) + return; + + bit = hash_get(vrf_hash, &lookup, vrf_hash_bitmap_alloc); + bit->set = false; +} + +int vrf_bitmap_check(vrf_bitmap_t bmap, vrf_id_t vrf_id) +{ + struct vrf_bit_set lookup = { .vrf_id = vrf_id }; + struct hash *vrf_hash = bmap; + struct vrf_bit_set *bit; + + if (vrf_hash == NULL || vrf_id == VRF_UNKNOWN) + return 0; + + bit = hash_lookup(vrf_hash, &lookup); + if (bit) + return bit->set; + + return 0; +} + +static void vrf_autocomplete(vector comps, struct cmd_token *token) +{ + struct vrf *vrf = NULL; + + RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) + vector_set(comps, XSTRDUP(MTYPE_COMPLETION, vrf->name)); +} + +static const struct cmd_variable_handler vrf_var_handlers[] = { + { + .varname = "vrf", + .completions = vrf_autocomplete, + }, + { + .varname = "vrf_name", + .completions = vrf_autocomplete, + }, + { + .varname = "nexthop_vrf", + .completions = vrf_autocomplete, + }, + {.completions = NULL}, +}; + +/* Initialize VRF module. */ +void vrf_init(int (*create)(struct vrf *), int (*enable)(struct vrf *), + int (*disable)(struct vrf *), int (*destroy)(struct vrf *)) +{ + struct vrf *default_vrf; + + /* initialise NS, in case VRF backend if NETNS */ + ns_init(); + if (debug_vrf) + zlog_debug("%s: Initializing VRF subsystem", __func__); + + vrf_master.vrf_new_hook = create; + vrf_master.vrf_enable_hook = enable; + vrf_master.vrf_disable_hook = disable; + vrf_master.vrf_delete_hook = destroy; + + /* The default VRF always exists. */ + default_vrf = vrf_get(VRF_DEFAULT, VRF_DEFAULT_NAME); + if (!default_vrf) { + flog_err(EC_LIB_VRF_START, + "vrf_init: failed to create the default VRF!"); + exit(1); + } + if (vrf_is_backend_netns()) { + struct ns *ns; + + strlcpy(default_vrf->data.l.netns_name, + VRF_DEFAULT_NAME, NS_NAMSIZ); + ns = ns_lookup(NS_DEFAULT); + ns->vrf_ctxt = default_vrf; + default_vrf->ns_ctxt = ns; + } + + /* Enable the default VRF. */ + if (!vrf_enable(default_vrf)) { + flog_err(EC_LIB_VRF_START, + "vrf_init: failed to enable the default VRF!"); + exit(1); + } + + cmd_variable_handler_register(vrf_var_handlers); +} + +static void vrf_terminate_single(struct vrf *vrf) +{ + /* Clear configured flag and invoke delete. */ + vrf_disable(vrf); + UNSET_FLAG(vrf->status, VRF_CONFIGURED); + if_terminate(vrf); + vrf_delete(vrf); +} + +/* Terminate VRF module. */ +void vrf_terminate(void) +{ + struct vrf *vrf, *tmp; + + if (debug_vrf) + zlog_debug("%s: Shutting down vrf subsystem", __func__); + + RB_FOREACH_SAFE (vrf, vrf_id_head, &vrfs_by_id, tmp) { + if (vrf->vrf_id == VRF_DEFAULT) + continue; + + vrf_terminate_single(vrf); + } + + RB_FOREACH_SAFE (vrf, vrf_name_head, &vrfs_by_name, tmp) { + if (vrf->vrf_id == VRF_DEFAULT) + continue; + + vrf_terminate_single(vrf); + } + + /* Finally terminate default VRF */ + vrf = vrf_lookup_by_id(VRF_DEFAULT); + if (vrf) + vrf_terminate_single(vrf); +} + +int vrf_socket(int domain, int type, int protocol, vrf_id_t vrf_id, + const char *interfacename) +{ + int ret, save_errno, ret2; + + ret = vrf_switch_to_netns(vrf_id); + if (ret < 0) + flog_err_sys(EC_LIB_SOCKET, "%s: Can't switch to VRF %u (%s)", + __func__, vrf_id, safe_strerror(errno)); + + ret = socket(domain, type, protocol); + save_errno = errno; + ret2 = vrf_switchback_to_initial(); + if (ret2 < 0) + flog_err_sys(EC_LIB_SOCKET, + "%s: Can't switchback from VRF %u (%s)", __func__, + vrf_id, safe_strerror(errno)); + errno = save_errno; + if (ret <= 0) + return ret; + ret2 = vrf_bind(vrf_id, ret, interfacename); + if (ret2 < 0) { + close(ret); + ret = ret2; + } + return ret; +} + +int vrf_is_backend_netns(void) +{ + return (vrf_backend == VRF_BACKEND_NETNS); +} + +int vrf_get_backend(void) +{ + if (!vrf_backend_configured) + return VRF_BACKEND_UNKNOWN; + return vrf_backend; +} + +int vrf_configure_backend(enum vrf_backend_type backend) +{ + /* Work around issue in old gcc */ + switch (backend) { + case VRF_BACKEND_UNKNOWN: + case VRF_BACKEND_NETNS: + case VRF_BACKEND_VRF_LITE: + break; + default: + return -1; + } + + vrf_backend = backend; + vrf_backend_configured = 1; + + return 0; +} + +/* vrf CLI commands */ +DEFUN_NOSH(vrf_exit, + vrf_exit_cmd, + "exit-vrf", + "Exit current mode and down to previous mode\n") +{ + cmd_exit(vty); + return CMD_SUCCESS; +} + +DEFUN_YANG_NOSH (vrf, + vrf_cmd, + "vrf NAME", + "Select a VRF to configure\n" + "VRF's name\n") +{ + int idx_name = 1; + const char *vrfname = argv[idx_name]->arg; + char xpath_list[XPATH_MAXLEN]; + struct vrf *vrf; + int ret; + + if (strlen(vrfname) > VRF_NAMSIZ) { + vty_out(vty, + "%% VRF name %s invalid: length exceeds %d bytes\n", + vrfname, VRF_NAMSIZ); + return CMD_WARNING_CONFIG_FAILED; + } + + snprintf(xpath_list, sizeof(xpath_list), FRR_VRF_KEY_XPATH, vrfname); + + nb_cli_enqueue_change(vty, xpath_list, NB_OP_CREATE, NULL); + ret = nb_cli_apply_changes_clear_pending(vty, xpath_list); + if (ret == CMD_SUCCESS) { + VTY_PUSH_XPATH(VRF_NODE, xpath_list); + vrf = vrf_lookup_by_name(vrfname); + if (vrf) + VTY_PUSH_CONTEXT(VRF_NODE, vrf); + } + + return ret; +} + +DEFUN_YANG (no_vrf, + no_vrf_cmd, + "no vrf NAME", + NO_STR + "Delete a pseudo VRF's configuration\n" + "VRF's name\n") +{ + const char *vrfname = argv[2]->arg; + char xpath_list[XPATH_MAXLEN]; + + struct vrf *vrfp; + + vrfp = vrf_lookup_by_name(vrfname); + + if (vrfp == NULL) + return CMD_SUCCESS; + + if (CHECK_FLAG(vrfp->status, VRF_ACTIVE)) { + vty_out(vty, "%% Only inactive VRFs can be deleted\n"); + return CMD_WARNING_CONFIG_FAILED; + } + + if (vrf_get_backend() == VRF_BACKEND_VRF_LITE) { + /* + * Remove the VRF interface config when removing the VRF. + */ + snprintf(xpath_list, sizeof(xpath_list), + "/frr-interface:lib/interface[name='%s']", vrfname); + nb_cli_enqueue_change(vty, xpath_list, NB_OP_DESTROY, NULL); + } + + snprintf(xpath_list, sizeof(xpath_list), FRR_VRF_KEY_XPATH, vrfname); + + nb_cli_enqueue_change(vty, xpath_list, NB_OP_DESTROY, NULL); + return nb_cli_apply_changes(vty, NULL); +} + + +static struct cmd_node vrf_node = { + .name = "vrf", + .node = VRF_NODE, + .parent_node = CONFIG_NODE, + .prompt = "%s(config-vrf)# ", +}; + +/* + * Debug CLI for vrf's + */ +DEFUN (vrf_debug, + vrf_debug_cmd, + "debug vrf", + DEBUG_STR + "VRF Debugging\n") +{ + debug_vrf = 1; + + return CMD_SUCCESS; +} + +DEFUN (no_vrf_debug, + no_vrf_debug_cmd, + "no debug vrf", + NO_STR + DEBUG_STR + "VRF Debugging\n") +{ + debug_vrf = 0; + + return CMD_SUCCESS; +} + +static int vrf_write_host(struct vty *vty) +{ + if (debug_vrf) + vty_out(vty, "debug vrf\n"); + + return 1; +} + +static int vrf_write_host(struct vty *vty); +static struct cmd_node vrf_debug_node = { + .name = "vrf debug", + .node = VRF_DEBUG_NODE, + .prompt = "", + .config_write = vrf_write_host, +}; + +void vrf_install_commands(void) +{ + install_node(&vrf_debug_node); + + install_element(CONFIG_NODE, &vrf_debug_cmd); + install_element(ENABLE_NODE, &vrf_debug_cmd); + install_element(CONFIG_NODE, &no_vrf_debug_cmd); + install_element(ENABLE_NODE, &no_vrf_debug_cmd); +} + +void vrf_cmd_init(int (*writefunc)(struct vty *vty)) +{ + install_element(CONFIG_NODE, &vrf_cmd); + install_element(CONFIG_NODE, &no_vrf_cmd); + vrf_node.config_write = writefunc; + install_node(&vrf_node); + install_default(VRF_NODE); + install_element(VRF_NODE, &vrf_exit_cmd); +} + +void vrf_set_default_name(const char *default_name) +{ + snprintf(vrf_default_name, VRF_NAMSIZ, "%s", default_name); +} + +const char *vrf_get_default_name(void) +{ + return vrf_default_name; +} + +int vrf_bind(vrf_id_t vrf_id, int fd, const char *ifname) +{ + int ret = 0; + struct interface *ifp; + struct vrf *vrf; + + if (fd < 0) + return -1; + + if (vrf_id == VRF_UNKNOWN) + return -1; + + /* can't bind to a VRF that doesn't exist */ + vrf = vrf_lookup_by_id(vrf_id); + if (!vrf_is_enabled(vrf)) + return -1; + + if (ifname && strcmp(ifname, vrf->name)) { + /* binding to a regular interface */ + + /* can't bind to an interface that doesn't exist */ + ifp = if_lookup_by_name(ifname, vrf_id); + if (!ifp) + return -1; + } else { + /* binding to a VRF device */ + + /* nothing to do for netns */ + if (vrf_is_backend_netns()) + return 0; + + /* nothing to do for default vrf */ + if (vrf_id == VRF_DEFAULT) + return 0; + + ifname = vrf->name; + } + +#ifdef SO_BINDTODEVICE + ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifname, + strlen(ifname) + 1); + if (ret < 0) + zlog_err("bind to interface %s failed, errno=%d", ifname, + errno); +#endif /* SO_BINDTODEVICE */ + return ret; +} +int vrf_getaddrinfo(const char *node, const char *service, + const struct addrinfo *hints, struct addrinfo **res, + vrf_id_t vrf_id) +{ + int ret, ret2, save_errno; + + ret = vrf_switch_to_netns(vrf_id); + if (ret < 0) + flog_err_sys(EC_LIB_SOCKET, "%s: Can't switch to VRF %u (%s)", + __func__, vrf_id, safe_strerror(errno)); + ret = getaddrinfo(node, service, hints, res); + save_errno = errno; + ret2 = vrf_switchback_to_initial(); + if (ret2 < 0) + flog_err_sys(EC_LIB_SOCKET, + "%s: Can't switchback from VRF %u (%s)", __func__, + vrf_id, safe_strerror(errno)); + errno = save_errno; + return ret; +} + +int vrf_ioctl(vrf_id_t vrf_id, int d, unsigned long request, char *params) +{ + int ret, saved_errno, rc; + + ret = vrf_switch_to_netns(vrf_id); + if (ret < 0) { + flog_err_sys(EC_LIB_SOCKET, "%s: Can't switch to VRF %u (%s)", + __func__, vrf_id, safe_strerror(errno)); + return 0; + } + rc = ioctl(d, request, params); + saved_errno = errno; + ret = vrf_switchback_to_initial(); + if (ret < 0) + flog_err_sys(EC_LIB_SOCKET, + "%s: Can't switchback from VRF %u (%s)", __func__, + vrf_id, safe_strerror(errno)); + errno = saved_errno; + return rc; +} + +int vrf_sockunion_socket(const union sockunion *su, vrf_id_t vrf_id, + const char *interfacename) +{ + int ret, save_errno, ret2; + + ret = vrf_switch_to_netns(vrf_id); + if (ret < 0) + flog_err_sys(EC_LIB_SOCKET, "%s: Can't switch to VRF %u (%s)", + __func__, vrf_id, safe_strerror(errno)); + ret = sockunion_socket(su); + save_errno = errno; + ret2 = vrf_switchback_to_initial(); + if (ret2 < 0) + flog_err_sys(EC_LIB_SOCKET, + "%s: Can't switchback from VRF %u (%s)", __func__, + vrf_id, safe_strerror(errno)); + errno = save_errno; + + if (ret <= 0) + return ret; + ret2 = vrf_bind(vrf_id, ret, interfacename); + if (ret2 < 0) { + close(ret); + ret = ret2; + } + return ret; +} + +/* ------- Northbound callbacks ------- */ + +/* + * XPath: /frr-vrf:lib/vrf + */ +static int lib_vrf_create(struct nb_cb_create_args *args) +{ + const char *vrfname; + struct vrf *vrfp; + + vrfname = yang_dnode_get_string(args->dnode, "./name"); + + if (args->event != NB_EV_APPLY) + return NB_OK; + + vrfp = vrf_get(VRF_UNKNOWN, vrfname); + + SET_FLAG(vrfp->status, VRF_CONFIGURED); + nb_running_set_entry(args->dnode, vrfp); + + return NB_OK; +} + +static int lib_vrf_destroy(struct nb_cb_destroy_args *args) +{ + struct vrf *vrfp; + + switch (args->event) { + case NB_EV_VALIDATE: + vrfp = nb_running_get_entry(args->dnode, NULL, true); + if (CHECK_FLAG(vrfp->status, VRF_ACTIVE)) { + snprintf(args->errmsg, args->errmsg_len, + "Only inactive VRFs can be deleted"); + return NB_ERR_VALIDATION; + } + break; + case NB_EV_PREPARE: + case NB_EV_ABORT: + break; + case NB_EV_APPLY: + vrfp = nb_running_unset_entry(args->dnode); + + /* Clear configured flag and invoke delete. */ + UNSET_FLAG(vrfp->status, VRF_CONFIGURED); + vrf_delete(vrfp); + break; + } + + return NB_OK; +} + +static const void *lib_vrf_get_next(struct nb_cb_get_next_args *args) +{ + struct vrf *vrfp = (struct vrf *)args->list_entry; + + if (args->list_entry == NULL) { + vrfp = RB_MIN(vrf_name_head, &vrfs_by_name); + } else { + vrfp = RB_NEXT(vrf_name_head, vrfp); + } + + return vrfp; +} + +static int lib_vrf_get_keys(struct nb_cb_get_keys_args *args) +{ + struct vrf *vrfp = (struct vrf *)args->list_entry; + + args->keys->num = 1; + strlcpy(args->keys->key[0], vrfp->name, sizeof(args->keys->key[0])); + + return NB_OK; +} + +static const void *lib_vrf_lookup_entry(struct nb_cb_lookup_entry_args *args) +{ + const char *vrfname = args->keys->key[0]; + + struct vrf *vrf = vrf_lookup_by_name(vrfname); + + return vrf; +} + +/* + * XPath: /frr-vrf:lib/vrf/id + */ +static struct yang_data * +lib_vrf_state_id_get_elem(struct nb_cb_get_elem_args *args) +{ + struct vrf *vrfp = (struct vrf *)args->list_entry; + + return yang_data_new_uint32(args->xpath, vrfp->vrf_id); +} + +/* + * XPath: /frr-vrf:lib/vrf/active + */ +static struct yang_data * +lib_vrf_state_active_get_elem(struct nb_cb_get_elem_args *args) +{ + struct vrf *vrfp = (struct vrf *)args->list_entry; + + if (vrfp->status == VRF_ACTIVE) + return yang_data_new_bool( + args->xpath, vrfp->status == VRF_ACTIVE ? true : false); + + return NULL; +} + +/* clang-format off */ +const struct frr_yang_module_info frr_vrf_info = { + .name = "frr-vrf", + .nodes = { + { + .xpath = "/frr-vrf:lib/vrf", + .cbs = { + .create = lib_vrf_create, + .destroy = lib_vrf_destroy, + .get_next = lib_vrf_get_next, + .get_keys = lib_vrf_get_keys, + .lookup_entry = lib_vrf_lookup_entry, + }, + .priority = NB_DFLT_PRIORITY - 2, + }, + { + .xpath = "/frr-vrf:lib/vrf/state/id", + .cbs = { + .get_elem = lib_vrf_state_id_get_elem, + } + }, + { + .xpath = "/frr-vrf:lib/vrf/state/active", + .cbs = { + .get_elem = lib_vrf_state_active_get_elem, + } + }, + { + .xpath = NULL, + }, + } +}; + |