212 lines
7.0 KiB
C
212 lines
7.0 KiB
C
/**
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* @file net_ipv6_route.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* IPv6 route module.
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*
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* Synopsis:
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* net.ipv6.route(string dest, string dest_prefix, string gateway, string metric, string ifname)
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* net.ipv6.route(string cidr_dest, string gateway, string metric, string ifname)
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*
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* Description:
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* Adds an IPv6 route to the system's routing table on initiailzation, and
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* removes it on deinitialization. The second form takes the destination in
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* CIDR notation (address/prefix).
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* If 'gateway' is "none", the route will only be associated with an interface.
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* If 'gateway' is "blackhole", the route will be a blackhole route (and 'ifname' is unused).
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* NOTE: blackhole routes for IPv6 are not yet implemented in Linux;
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* adding them via this interface will only work once they
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* have been.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <misc/debug.h>
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#include <ncd/extra/NCDIfConfig.h>
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#include <ncd/module_common.h>
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#include <generated/blog_channel_ncd_net_ipv6_route.h>
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#define TYPE_NORMAL 1
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#define TYPE_IFONLY 2
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#define TYPE_BLACKHOLE 3
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struct instance {
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NCDModuleInst *i;
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struct ipv6_ifaddr dest;
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int type;
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struct ipv6_addr gateway;
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int metric;
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NCDValNullTermString ifname_nts;
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};
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static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct instance *o = vo;
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o->i = i;
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// read arguments
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NCDValRef dest_arg;
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NCDValRef dest_prefix_arg = NCDVal_NewInvalid();
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NCDValRef gateway_arg;
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NCDValRef metric_arg;
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NCDValRef ifname_arg;
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if (!NCDVal_ListRead(params->args, 4, &dest_arg, &gateway_arg, &metric_arg, &ifname_arg) &&
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!NCDVal_ListRead(params->args, 5, &dest_arg, &dest_prefix_arg, &gateway_arg, &metric_arg, &ifname_arg)
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) {
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ModuleLog(o->i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(dest_arg) || !NCDVal_IsString(gateway_arg) ||
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!NCDVal_IsStringNoNulls(ifname_arg) ||
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(!NCDVal_IsInvalid(dest_prefix_arg) && !NCDVal_IsString(dest_prefix_arg))
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) {
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ModuleLog(o->i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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// read dest
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if (NCDVal_IsInvalid(dest_prefix_arg)) {
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if (!ipaddr6_parse_ipv6_ifaddr(NCDVal_StringMemRef(dest_arg), &o->dest)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong CIDR notation dest");
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goto fail0;
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}
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} else {
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if (!ipaddr6_parse_ipv6_addr(NCDVal_StringMemRef(dest_arg), &o->dest.addr)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong dest addr");
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goto fail0;
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}
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if (!ipaddr6_parse_ipv6_prefix(NCDVal_StringMemRef(dest_prefix_arg), &o->dest.prefix)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong dest prefix");
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goto fail0;
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}
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}
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// read gateway and choose type
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if (NCDVal_StringEquals(gateway_arg, "none")) {
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o->type = TYPE_IFONLY;
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}
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else if (NCDVal_StringEquals(gateway_arg, "blackhole")) {
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o->type = TYPE_BLACKHOLE;
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} else {
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if (!ipaddr6_parse_ipv6_addr(NCDVal_StringMemRef(gateway_arg), &o->gateway)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong gateway");
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goto fail0;
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}
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o->type = TYPE_NORMAL;
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}
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// read metric
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uintmax_t metric;
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if (!ncd_read_uintmax(metric_arg, &metric) || metric > INT_MAX) {
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ModuleLog(i, BLOG_ERROR, "bad metric");
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goto fail0;
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}
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o->metric = metric;
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// null terminate ifname
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if (!NCDVal_StringNullTerminate(ifname_arg, &o->ifname_nts)) {
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ModuleLog(i, BLOG_ERROR, "NCDVal_StringNullTerminate failed");
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goto fail0;
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}
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// add route
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int res = 0; // to remove warning
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switch (o->type) {
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case TYPE_NORMAL:
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res = NCDIfConfig_add_ipv6_route(o->dest, &o->gateway, o->metric, o->ifname_nts.data);
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break;
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case TYPE_IFONLY:
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res = NCDIfConfig_add_ipv6_route(o->dest, NULL, o->metric, o->ifname_nts.data);
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break;
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case TYPE_BLACKHOLE:
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res = NCDIfConfig_add_ipv6_blackhole_route(o->dest, o->metric);
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break;
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default: ASSERT(0);
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}
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if (!res) {
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ModuleLog(o->i, BLOG_ERROR, "failed to add route");
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goto fail1;
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}
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// signal up
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NCDModuleInst_Backend_Up(o->i);
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return;
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fail1:
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NCDValNullTermString_Free(&o->ifname_nts);
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void func_die (void *vo)
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{
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struct instance *o = vo;
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// remove route
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int res = 0; // to remove warning
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switch (o->type) {
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case TYPE_NORMAL:
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res = NCDIfConfig_remove_ipv6_route(o->dest, &o->gateway, o->metric, o->ifname_nts.data);
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break;
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case TYPE_IFONLY:
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res = NCDIfConfig_remove_ipv6_route(o->dest, NULL, o->metric, o->ifname_nts.data);
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break;
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case TYPE_BLACKHOLE:
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res = NCDIfConfig_remove_ipv6_blackhole_route(o->dest, o->metric);
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break;
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default: ASSERT(0);
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}
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if (!res) {
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ModuleLog(o->i, BLOG_ERROR, "failed to remove route");
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}
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// free ifname nts
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NCDValNullTermString_Free(&o->ifname_nts);
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NCDModuleInst_Backend_Dead(o->i);
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}
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static struct NCDModule modules[] = {
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{
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.type = "net.ipv6.route",
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.func_new2 = func_new,
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.func_die = func_die,
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.alloc_size = sizeof(struct instance)
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}, {
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.type = NULL
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}
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};
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const struct NCDModuleGroup ncdmodule_net_ipv6_route = {
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.modules = modules
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};
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