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Diffstat (limited to '')
| -rw-r--r-- | lib/ns.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/lib/ns.h b/lib/ns.h new file mode 100644 index 0000000..93a3781 --- /dev/null +++ b/lib/ns.h @@ -0,0 +1,194 @@ +/* + * NS related header. + * 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 + */ + +#ifndef _ZEBRA_NS_H +#define _ZEBRA_NS_H + +#include "openbsd-tree.h" +#include "linklist.h" +#include "vty.h" + +#ifdef __cplusplus +extern "C" { +#endif + +typedef uint32_t ns_id_t; + +/* the default NS ID */ +#define NS_UNKNOWN UINT32_MAX + +/* Default netns directory (Linux) */ +#define NS_RUN_DIR "/var/run/netns" + +#ifdef HAVE_NETNS +#define NS_DEFAULT_NAME "/proc/self/ns/net" +#else /* !HAVE_NETNS */ +#define NS_DEFAULT_NAME "default-netns" +#endif /* HAVE_NETNS */ + +struct ns { + RB_ENTRY(ns) entry; + + /* Identifier, same as the vector index */ + ns_id_t ns_id; + + /* Identifier, mapped on the NSID value */ + ns_id_t internal_ns_id; + + /* Identifier, value of NSID of default netns, + * relative value in that local netns + */ + ns_id_t relative_default_ns; + + /* Name */ + char *name; + + /* File descriptor */ + int fd; + + /* Master list of interfaces belonging to this NS */ + struct list *iflist; + + /* Back Pointer to VRF */ + void *vrf_ctxt; + + /* User data */ + void *info; +}; +RB_HEAD(ns_head, ns); +RB_PROTOTYPE(ns_head, ns, entry, ns_compare) + +/* + * API for managing NETNS. eg from zebra daemon + * one want to manage the list of NETNS, etc... + */ + +/* + * NS hooks + */ + +#define NS_NEW_HOOK 0 /* a new netns is just created */ +#define NS_DELETE_HOOK 1 /* a netns is to be deleted */ +#define NS_ENABLE_HOOK 2 /* a netns is ready to use */ +#define NS_DISABLE_HOOK 3 /* a netns is to be unusable */ + +/* + * Add a specific hook ns module. + * @param1: hook type + * @param2: the callback function + * - param 1: the NS ID + * - param 2: the address of the user data pointer (the user data + * can be stored in or freed from there) + */ +extern void ns_add_hook(int type, int (*)(struct ns *)); + + +/* + * NS initializer/destructor + */ + +extern void ns_terminate(void); + +/* API to initialize NETNS managerment + * parameter is the default ns_id + */ +extern void ns_init_management(ns_id_t ns_id, ns_id_t internal_ns_idx); + + +/* + * NS utilities + */ + +/* Create a socket serving for the given NS + */ +int ns_socket(int domain, int type, int protocol, ns_id_t ns_id); + +/* return the path of the NETNS */ +extern char *ns_netns_pathname(struct vty *vty, const char *name); + +/* Parse and execute a function on all the NETNS */ +#define NS_WALK_CONTINUE 0 +#define NS_WALK_STOP 1 + +extern void ns_walk_func(int (*func)(struct ns *, + void *, + void **), + void *param_in, + void **param_out); + +/* API to get the NETNS name, from the ns pointer */ +extern const char *ns_get_name(struct ns *ns); + +/* only called from vrf ( when removing netns from vrf) + * or at VRF termination + */ +extern void ns_delete(struct ns *ns); + +/* return > 0 if netns is available + * called by VRF to check netns backend is available for VRF + */ +extern int ns_have_netns(void); + +/* API to get context information of a NS */ +extern void *ns_info_lookup(ns_id_t ns_id); + +/* API to map internal ns id value with + * user friendly ns id external value + */ +extern ns_id_t ns_map_nsid_with_external(ns_id_t ns_id, bool map); + +/* + * NS init routine + * should be called from backendx + */ +extern void ns_init(void); + +#define NS_DEFAULT 0 + +/* API that can be used to change from NS */ +extern int ns_switchback_to_initial(void); +extern int ns_switch_to_netns(const char *netns_name); + +/* + * NS handling routines. + * called by modules that use NS backend + */ + +/* API to search for already present NETNS */ +extern struct ns *ns_lookup(ns_id_t ns_id); +extern struct ns *ns_lookup_name(const char *name); + +/* API to handle NS : creation, enable, disable + * for enable, a callback function is passed as parameter + * the callback belongs to the module that uses NS as backend + * upon enabling the NETNS, the upper layer is informed + */ +extern int ns_enable(struct ns *ns, void (*func)(ns_id_t, void *)); +extern struct ns *ns_get_created(struct ns *ns, char *name, ns_id_t ns_id); +extern ns_id_t ns_id_get_absolute(ns_id_t ns_id_reference, ns_id_t link_nsid); +extern void ns_disable(struct ns *ns); +extern struct ns *ns_get_default(void); + +#ifdef __cplusplus +} +#endif + +#endif /*_ZEBRA_NS_H*/ |