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route.c

/*
 * 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-local.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;

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
 *
 * Allocates a new cache, initializes it properly and updates it to
 * contain all routes currently configured in the kernel.
 *
 * @note The caller is responsible for destroying and freeing the
 *       cache after using it.
 * @return The cache or NULL if an error has occured.
 */
00075 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,
};

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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