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/*
* lib/route/route.c Routes
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
*/
/**
* @ingroup rtnl
* @defgroup route Routing
* @brief
* @{
*/
#include <netlink-private/netlink.h>
#include <netlink/netlink.h>
#include <netlink/cache.h>
#include <netlink/utils.h>
#include <netlink/data.h>
#include <netlink/route/rtnl.h>
#include <netlink/route/route.h>
#include <netlink/route/link.h>
static struct nl_cache_ops rtnl_route_ops;
uint32_t route_cache_search_attr_get(struct nl_cache *cache,
struct nl_object *needle)
{
struct nl_object_ops *ops = needle->ce_ops;
struct rtnl_route *new_route = (struct rtnl_route *)needle;
/*
* If route add req is a replace
* or it is a ipv6 multipath route
* then, we replace the existing object
* in the cache. So, look for the first object
* that matches the hash key attributes
*/
if ((new_route->rt_msgflags & NLM_F_REPLACE) ||
rtnl_route_is_likely_ipv6_multipath(new_route))
return ops->oo_hash_attrs_get(needle);
else
return ops->oo_id_attrs_get(needle);
}
static int route_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
struct nlmsghdr *nlh, struct nl_parser_param *pp)
{
struct rtnl_route *route;
int err;
if ((err = rtnl_route_parse(nlh, &route)) < 0)
return err;
err = pp->pp_cb((struct nl_object *) route, pp);
rtnl_route_put(route);
return err;
}
static int route_request_update(struct nl_cache *c, struct nl_sock *h)
{
struct rtmsg rhdr = {
.rtm_family = c->c_iarg1,
};
if (c->c_iarg2 & ROUTE_CACHE_CONTENT)
rhdr.rtm_flags |= RTM_F_CLONED;
return nl_send_simple(h, RTM_GETROUTE, NLM_F_DUMP, &rhdr, sizeof(rhdr));
}
/**
* @name Cache Management
* @{
*/
/**
* Build a route cache holding all routes currently configured in the kernel
* @arg sk Netlink socket.
* @arg family Address family of routes to cover or AF_UNSPEC
* @arg flags Flags
* @arg result Result pointer
*
* Allocates a new cache, initializes it properly and updates it to
* contain all routes currently configured in the kernel.
*
* Valid flags:
* * ROUTE_CACHE_CONTENT - Cache will contain contents of routing cache
* instead of actual routes.
*
* @note The caller is responsible for destroying and freeing the
* cache after using it.
* @return 0 on success or a negative error code.
*/
int rtnl_route_alloc_cache(struct nl_sock *sk, int family, int flags,
struct nl_cache **result)
{
struct nl_cache *cache;
int err;
if (!(cache = nl_cache_alloc(&rtnl_route_ops)))
return -NLE_NOMEM;
cache->c_iarg1 = family;
cache->c_iarg2 = flags;
if (sk && (err = nl_cache_refill(sk, cache)) < 0) {
free(cache);
return err;
}
*result = cache;
return 0;
}
/** @} */
/**
* @name Route Addition
* @{
*/
static int build_route_msg(struct rtnl_route *tmpl, int cmd, int flags,
struct nl_msg **result)
{
struct nl_msg *msg;
int err;
if (!(msg = nlmsg_alloc_simple(cmd, flags)))
return -NLE_NOMEM;
if ((err = rtnl_route_build_msg(msg, tmpl)) < 0) {
nlmsg_free(msg);
return err;
}
*result = msg;
return 0;
}
int rtnl_route_build_add_request(struct rtnl_route *tmpl, int flags,
struct nl_msg **result)
{
return build_route_msg(tmpl, RTM_NEWROUTE, NLM_F_CREATE | flags,
result);
}
int rtnl_route_add(struct nl_sock *sk, struct rtnl_route *route, int flags)
{
struct nl_msg *msg;
int err;
if ((err = rtnl_route_build_add_request(route, flags, &msg)) < 0)
return err;
err = nl_send_auto_complete(sk, msg);
nlmsg_free(msg);
if (err < 0)
return err;
return wait_for_ack(sk);
}
int rtnl_route_build_del_request(struct rtnl_route *tmpl, int flags,
struct nl_msg **result)
{
return build_route_msg(tmpl, RTM_DELROUTE, flags, result);
}
int rtnl_route_delete(struct nl_sock *sk, struct rtnl_route *route, int flags)
{
struct nl_msg *msg;
int err;
if ((err = rtnl_route_build_del_request(route, flags, &msg)) < 0)
return err;
err = nl_send_auto_complete(sk, msg);
nlmsg_free(msg);
if (err < 0)
return err;
return wait_for_ack(sk);
}
/** @} */
static struct nl_af_group route_groups[] = {
{ AF_INET, RTNLGRP_IPV4_ROUTE },
{ AF_INET6, RTNLGRP_IPV6_ROUTE },
{ AF_DECnet, RTNLGRP_DECnet_ROUTE },
{ END_OF_GROUP_LIST },
};
static struct nl_cache_ops rtnl_route_ops = {
.co_name = "route/route",
.co_hdrsize = sizeof(struct rtmsg),
.co_msgtypes = {
{ RTM_NEWROUTE, NL_ACT_NEW, "new" },
{ RTM_DELROUTE, NL_ACT_DEL, "del" },
{ RTM_GETROUTE, NL_ACT_GET, "get" },
END_OF_MSGTYPES_LIST,
},
.co_protocol = NETLINK_ROUTE,
.co_groups = route_groups,
.co_request_update = route_request_update,
.co_msg_parser = route_msg_parser,
.co_obj_ops = &route_obj_ops,
.co_cache_search_attrs_get = route_cache_search_attr_get,
};
static void __init route_init(void)
{
nl_cache_mngt_register(&rtnl_route_ops);
}
static void __exit route_exit(void)
{
nl_cache_mngt_unregister(&rtnl_route_ops);
}
/** @} */
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