示例#1
0
NMIP6Config *
nm_ip6_manager_get_ip6_config (NMIP6Manager *manager, int ifindex)
{
	NMIP6ManagerPrivate *priv;
	NMIP6Device *device;
	NMIP6Config *config;
	struct rtnl_addr *rtnladdr;
	struct nl_addr *nladdr;
	struct in6_addr *addr;
	NMIP6Address *ip6addr;
	struct rtnl_route *rtnlroute;
	struct nl_addr *nldest, *nlgateway;
	struct in6_addr *dest, *gateway;
	gboolean defgw_set = FALSE;
	struct in6_addr defgw;
	uint32_t metric;
	NMIP6Route *ip6route;
	int i;

	g_return_val_if_fail (NM_IS_IP6_MANAGER (manager), NULL);
	g_return_val_if_fail (ifindex > 0, NULL);

	priv = NM_IP6_MANAGER_GET_PRIVATE (manager);

	device = (NMIP6Device *) g_hash_table_lookup (priv->devices,
	                                              GINT_TO_POINTER (ifindex));
	if (!device) {
		nm_log_warn (LOGD_IP6, "(%d): addrconf not started.", ifindex);
		return NULL;
	}

	config = nm_ip6_config_new ();
	if (!config) {
		nm_log_err (LOGD_IP6, "(%s): out of memory creating IP6 config object.",
		            device->iface);
		return NULL;
	}

	/* Make sure we refill the route and address caches, otherwise we won't get
	 * up-to-date information here since the netlink route/addr change messages
	 * may be lagging a bit.
	 */
	nl_cache_refill (priv->nlh, priv->route_cache);
	nl_cache_refill (priv->nlh, priv->addr_cache);

	/* Add routes */
	for (rtnlroute = FIRST_ROUTE (priv->route_cache); rtnlroute; rtnlroute = NEXT_ROUTE (rtnlroute)) {
		/* Make sure it's an IPv6 route for this device */
		if (rtnl_route_get_oif (rtnlroute) != device->ifindex)
			continue;
		if (rtnl_route_get_family (rtnlroute) != AF_INET6)
			continue;

		nldest = rtnl_route_get_dst (rtnlroute);
		if (!nldest || nl_addr_get_family (nldest) != AF_INET6)
			continue;
		dest = nl_addr_get_binary_addr (nldest);

		nlgateway = rtnl_route_get_gateway (rtnlroute);
		if (!nlgateway || nl_addr_get_family (nlgateway) != AF_INET6)
			continue;
		gateway = nl_addr_get_binary_addr (nlgateway);

		if (rtnl_route_get_dst_len (rtnlroute) == 0) {
			/* Default gateway route; don't add to normal routes but to each address */
			if (!defgw_set) {
				memcpy (&defgw, gateway, sizeof (defgw));
				defgw_set = TRUE;
			}
			continue;
		}

		/* Also ignore link-local routes where the destination and gateway are
		 * the same, which apparently get added by the kernel but return -EINVAL
		 * when we try to add them via netlink.
		 */
		if (gateway && IN6_ARE_ADDR_EQUAL (dest, gateway))
			continue;

		ip6route = nm_ip6_route_new ();
		nm_ip6_route_set_dest (ip6route, dest);
		nm_ip6_route_set_prefix (ip6route, rtnl_route_get_dst_len (rtnlroute));
		nm_ip6_route_set_next_hop (ip6route, gateway);
		rtnl_route_get_metric(rtnlroute, 1, &metric);
		if (metric != UINT_MAX)
			nm_ip6_route_set_metric (ip6route, metric);
		nm_ip6_config_take_route (config, ip6route);
	}

	/* Add addresses */
	for (rtnladdr = FIRST_ADDR (priv->addr_cache); rtnladdr; rtnladdr = NEXT_ADDR (rtnladdr)) {
		if (rtnl_addr_get_ifindex (rtnladdr) != device->ifindex)
			continue;

		nladdr = rtnl_addr_get_local (rtnladdr);
		if (!nladdr || nl_addr_get_family (nladdr) != AF_INET6)
			continue;

		addr = nl_addr_get_binary_addr (nladdr);
		ip6addr = nm_ip6_address_new ();
		nm_ip6_address_set_prefix (ip6addr, rtnl_addr_get_prefixlen (rtnladdr));
		nm_ip6_address_set_address (ip6addr, addr);
		nm_ip6_config_take_address (config, ip6addr);
		if (defgw_set)
			nm_ip6_address_set_gateway (ip6addr, &defgw);
	}

	/* Add DNS servers */
	if (device->rdnss_servers) {
		NMIP6RDNSS *rdnss = (NMIP6RDNSS *)(device->rdnss_servers->data);

		for (i = 0; i < device->rdnss_servers->len; i++)
			nm_ip6_config_add_nameserver (config, &rdnss[i].addr);
	}

	/* Add DNS domains */
	if (device->dnssl_domains) {
		NMIP6DNSSL *dnssl = (NMIP6DNSSL *)(device->dnssl_domains->data);

		for (i = 0; i < device->dnssl_domains->len; i++)
			nm_ip6_config_add_domain (config, dnssl[i].domain);
	}

	return config;
}
static void copy_cacheinfo_into_route(struct rta_cacheinfo *ci,
				      struct rtnl_route *route)
{
	struct rtnl_rtcacheinfo nci = {
		.rtci_clntref  = ci->rta_clntref,
		.rtci_last_use = ci->rta_lastuse,
		.rtci_expires  = ci->rta_expires,
		.rtci_error    = ci->rta_error,
		.rtci_used     = ci->rta_used,
		.rtci_id       = ci->rta_id,
		.rtci_ts       = ci->rta_ts,
		.rtci_tsage    = ci->rta_tsage,
	};

	rtnl_route_set_cacheinfo(route, &nci);
}

static int route_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
			    struct nlmsghdr *nlh, struct nl_parser_param *pp)
{
	struct rtmsg *rtm;
	struct rtnl_route *route;
	struct nlattr *tb[RTA_MAX + 1];
	struct nl_addr *src = NULL, *dst = NULL, *addr;
	int err;

	route = rtnl_route_alloc();
	if (!route) {
		err = nl_errno(ENOMEM);
		goto errout;
	}

	route->ce_msgtype = nlh->nlmsg_type;

	err = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, RTA_MAX,
			  route_policy);
	if (err < 0)
		goto errout;

	rtm = nlmsg_data(nlh);
	rtnl_route_set_family(route, rtm->rtm_family);
	rtnl_route_set_tos(route, rtm->rtm_tos);
	rtnl_route_set_table(route, rtm->rtm_table);
	rtnl_route_set_type(route, rtm->rtm_type);
	rtnl_route_set_scope(route, rtm->rtm_scope);
	rtnl_route_set_protocol(route, rtm->rtm_protocol);
	rtnl_route_set_flags(route, rtm->rtm_flags);

	if (tb[RTA_DST]) {
		dst = nla_get_addr(tb[RTA_DST], rtm->rtm_family);
		if (dst == NULL)
			goto errout_errno;
	} else {
		dst = nl_addr_alloc(0);
		nl_addr_set_family(dst, rtm->rtm_family);
	}

	nl_addr_set_prefixlen(dst, rtm->rtm_dst_len);
	err = rtnl_route_set_dst(route, dst);
	if (err < 0)
		goto errout;

	nl_addr_put(dst);

	if (tb[RTA_SRC]) {
		src = nla_get_addr(tb[RTA_SRC], rtm->rtm_family);
		if (src == NULL)
			goto errout_errno;
	} else if (rtm->rtm_src_len)
		src = nl_addr_alloc(0);

	if (src) {
		nl_addr_set_prefixlen(src, rtm->rtm_src_len);
		rtnl_route_set_src(route, src);
		nl_addr_put(src);
	}

	if (tb[RTA_IIF])
		rtnl_route_set_iif(route, nla_get_string(tb[RTA_IIF]));

	if (tb[RTA_OIF])
		rtnl_route_set_oif(route, nla_get_u32(tb[RTA_OIF]));

	if (tb[RTA_GATEWAY]) {
		addr = nla_get_addr(tb[RTA_GATEWAY], route->rt_family);
		if (addr == NULL)
			goto errout_errno;
		rtnl_route_set_gateway(route, addr);
		nl_addr_put(addr);
	}

	if (tb[RTA_PRIORITY])
		rtnl_route_set_prio(route, nla_get_u32(tb[RTA_PRIORITY]));

	if (tb[RTA_PREFSRC]) {
		addr = nla_get_addr(tb[RTA_PREFSRC], route->rt_family);
		if (addr == NULL)
			goto errout_errno;
		rtnl_route_set_pref_src(route, addr);
		nl_addr_put(addr);
	}

	if (tb[RTA_METRICS]) {
		struct nlattr *mtb[RTAX_MAX + 1];
		int i;

		err = nla_parse_nested(mtb, RTAX_MAX, tb[RTA_METRICS], NULL);
		if (err < 0)
			goto errout;

		for (i = 1; i <= RTAX_MAX; i++) {
			if (mtb[i] && nla_len(mtb[i]) >= sizeof(uint32_t)) {
				uint32_t m = nla_get_u32(mtb[i]);
				if (rtnl_route_set_metric(route, i, m) < 0)
					goto errout_errno;
			}
		}
	}

	if (tb[RTA_MULTIPATH]) {
		struct rtnl_nexthop *nh;
		struct rtnexthop *rtnh = nla_data(tb[RTA_MULTIPATH]);
		size_t tlen = nla_len(tb[RTA_MULTIPATH]);

		while (tlen >= sizeof(*rtnh) && tlen >= rtnh->rtnh_len) {
			nh = rtnl_route_nh_alloc();
			if (!nh)
				goto errout;

			rtnl_route_nh_set_weight(nh, rtnh->rtnh_hops);
			rtnl_route_nh_set_ifindex(nh, rtnh->rtnh_ifindex);
			rtnl_route_nh_set_flags(nh, rtnh->rtnh_flags);

			if (rtnh->rtnh_len > sizeof(*rtnh)) {
				struct nlattr *ntb[RTA_MAX + 1];
				nla_parse(ntb, RTA_MAX, (struct nlattr *)
					  RTNH_DATA(rtnh),
					  rtnh->rtnh_len - sizeof(*rtnh),
					  route_policy);

				if (ntb[RTA_GATEWAY]) {
					nh->rtnh_gateway = nla_get_addr(
							ntb[RTA_GATEWAY],
							route->rt_family);
					nh->rtnh_mask = NEXTHOP_HAS_GATEWAY;
				}
			}

			rtnl_route_add_nexthop(route, nh);
			tlen -= RTNH_ALIGN(rtnh->rtnh_len);
			rtnh = RTNH_NEXT(rtnh);
		}
	}

	if (tb[RTA_FLOW])
		rtnl_route_set_realms(route, nla_get_u32(tb[RTA_FLOW]));

	if (tb[RTA_CACHEINFO])
		copy_cacheinfo_into_route(nla_data(tb[RTA_CACHEINFO]), route);

	if (tb[RTA_MP_ALGO])
		rtnl_route_set_mp_algo(route, nla_get_u32(tb[RTA_MP_ALGO]));

	err = pp->pp_cb((struct nl_object *) route, pp);
	if (err < 0)
		goto errout;

	err = P_ACCEPT;

errout:
	rtnl_route_put(route);
	return err;

errout_errno:
	err = nl_get_errno();
	goto errout;
}

static int route_request_update(struct nl_cache *c, struct nl_handle *h)
{
	return nl_rtgen_request(h, RTM_GETROUTE, AF_UNSPEC, NLM_F_DUMP);
}

/**
 * @name Cache Management
 * @{
 */

/**
 * Build a route cache holding all routes currently configured in the kernel
 * @arg handle		netlink handle
 *
 * 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.
 */
struct nl_cache *rtnl_route_alloc_cache(struct nl_handle *handle)
{
	struct nl_cache *cache;

	cache = nl_cache_alloc(&rtnl_route_ops);
	if (!cache)
		return NULL;

	if (handle && nl_cache_refill(handle, cache) < 0) {
		free(cache);
		return NULL;
	}

	return cache;
}

/** @} */

/**
 * @name Route Addition
 * @{
 */

static struct nl_msg *build_route_msg(struct rtnl_route *tmpl, int cmd,
				      int flags)
{
	struct nl_msg *msg;
	struct nl_addr *addr;
	int scope, i, oif, nmetrics = 0;
	struct nlattr *metrics;
	struct rtmsg rtmsg = {
		.rtm_family = rtnl_route_get_family(tmpl),
		.rtm_dst_len = rtnl_route_get_dst_len(tmpl),
		.rtm_src_len = rtnl_route_get_src_len(tmpl),
		.rtm_tos = rtnl_route_get_tos(tmpl),
		.rtm_table = rtnl_route_get_table(tmpl),
		.rtm_type = rtnl_route_get_type(tmpl),
		.rtm_protocol = rtnl_route_get_protocol(tmpl),
		.rtm_flags = rtnl_route_get_flags(tmpl),
	};

	if (rtmsg.rtm_family == AF_UNSPEC) {
		nl_error(EINVAL, "Cannot build route message, address " \
				 "family is unknown.");
		return NULL;
	}

	scope = rtnl_route_get_scope(tmpl);
	if (scope == RT_SCOPE_NOWHERE) {
		if (rtmsg.rtm_type == RTN_LOCAL)
			scope = RT_SCOPE_HOST;
		else {
			/* XXX Change to UNIVERSE if gw || nexthops */
			scope = RT_SCOPE_LINK;
		}
	}

	rtmsg.rtm_scope = scope;

	msg = nlmsg_alloc_simple(cmd, flags);
	if (msg == NULL)
		return NULL;

	if (nlmsg_append(msg, &rtmsg, sizeof(rtmsg), NLMSG_ALIGNTO) < 0)
		goto nla_put_failure;

	addr = rtnl_route_get_dst(tmpl);
	if (addr)
		NLA_PUT_ADDR(msg, RTA_DST, addr);

	addr = rtnl_route_get_src(tmpl);
	if (addr)
		NLA_PUT_ADDR(msg, RTA_SRC, addr);

	addr = rtnl_route_get_gateway(tmpl);
	if (addr)
		NLA_PUT_ADDR(msg, RTA_GATEWAY, addr);

	addr = rtnl_route_get_pref_src(tmpl);
	if (addr)
		NLA_PUT_ADDR(msg, RTA_PREFSRC, addr);

	NLA_PUT_U32(msg, RTA_PRIORITY, rtnl_route_get_prio(tmpl));

	oif = rtnl_route_get_oif(tmpl);
	if (oif != RTNL_LINK_NOT_FOUND)
		NLA_PUT_U32(msg, RTA_OIF, oif);

	for (i = 1; i <= RTAX_MAX; i++)
		if (rtnl_route_get_metric(tmpl, i) != UINT_MAX)
			nmetrics++;

	if (nmetrics > 0) {
		unsigned int val;

		metrics = nla_nest_start(msg, RTA_METRICS);
		if (metrics == NULL)
			goto nla_put_failure;

		for (i = 1; i <= RTAX_MAX; i++) {
			val = rtnl_route_get_metric(tmpl, i);
			if (val != UINT_MAX)
				NLA_PUT_U32(msg, i, val);
		}

		nla_nest_end(msg, metrics);
	}

#if 0
	RTA_IIF,
	RTA_MULTIPATH,
	RTA_PROTOINFO,
	RTA_FLOW,
	RTA_CACHEINFO,
	RTA_SESSION,
	RTA_MP_ALGO,
#endif

	return msg;

nla_put_failure:
	nlmsg_free(msg);
	return NULL;
}

struct nl_msg *rtnl_route_build_add_request(struct rtnl_route *tmpl, int flags)
{
	return build_route_msg(tmpl, RTM_NEWROUTE, NLM_F_CREATE | flags);
}

int rtnl_route_add(struct nl_handle *handle, struct rtnl_route *route,
		   int flags)
{
	struct nl_msg *msg;
	int err;

	msg = rtnl_route_build_add_request(route, flags);
	if (!msg)
		return nl_get_errno();

	err = nl_send_auto_complete(handle, msg);
	nlmsg_free(msg);
	if (err < 0)
		return err;

	return nl_wait_for_ack(handle);
}

struct nl_msg *rtnl_route_build_del_request(struct rtnl_route *tmpl, int flags)
{
	return build_route_msg(tmpl, RTM_DELROUTE, flags);
}

int rtnl_route_del(struct nl_handle *handle, struct rtnl_route *route,
		   int flags)
{
	struct nl_msg *msg;
	int err;

	msg = rtnl_route_build_del_request(route, flags);
	if (!msg)
		return nl_get_errno();

	err = nl_send_auto_complete(handle, msg);
	nlmsg_free(msg);
	if (err < 0)
		return err;

	return nl_wait_for_ack(handle);
}

/** @} */

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);
}