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1 office 1 /**
2 * @file net_ipv6_route.c
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * @section DESCRIPTION
30 *
31 * IPv6 route module.
32 *
33 * Synopsis:
34 * net.ipv6.route(string dest, string dest_prefix, string gateway, string metric, string ifname)
35 * net.ipv6.route(string cidr_dest, string gateway, string metric, string ifname)
36 *
37 * Description:
38 * Adds an IPv6 route to the system's routing table on initiailzation, and
39 * removes it on deinitialization. The second form takes the destination in
40 * CIDR notation (address/prefix).
41 * If 'gateway' is "none", the route will only be associated with an interface.
42 * If 'gateway' is "blackhole", the route will be a blackhole route (and 'ifname' is unused).
43 * NOTE: blackhole routes for IPv6 are not yet implemented in Linux;
44 * adding them via this interface will only work once they
45 * have been.
46 */
47  
48 #include <stdlib.h>
49 #include <string.h>
50  
51 #include <misc/debug.h>
52 #include <ncd/extra/NCDIfConfig.h>
53  
54 #include <ncd/module_common.h>
55  
56 #include <generated/blog_channel_ncd_net_ipv6_route.h>
57  
58 #define TYPE_NORMAL 1
59 #define TYPE_IFONLY 2
60 #define TYPE_BLACKHOLE 3
61  
62 struct instance {
63 NCDModuleInst *i;
64 struct ipv6_ifaddr dest;
65 int type;
66 struct ipv6_addr gateway;
67 int metric;
68 NCDValNullTermString ifname_nts;
69 };
70  
71 static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
72 {
73 struct instance *o = vo;
74 o->i = i;
75  
76 // read arguments
77 NCDValRef dest_arg;
78 NCDValRef dest_prefix_arg = NCDVal_NewInvalid();
79 NCDValRef gateway_arg;
80 NCDValRef metric_arg;
81 NCDValRef ifname_arg;
82 if (!NCDVal_ListRead(params->args, 4, &dest_arg, &gateway_arg, &metric_arg, &ifname_arg) &&
83 !NCDVal_ListRead(params->args, 5, &dest_arg, &dest_prefix_arg, &gateway_arg, &metric_arg, &ifname_arg)
84 ) {
85 ModuleLog(o->i, BLOG_ERROR, "wrong arity");
86 goto fail0;
87 }
88 if (!NCDVal_IsString(dest_arg) || !NCDVal_IsString(gateway_arg) ||
89 !NCDVal_IsStringNoNulls(ifname_arg) ||
90 (!NCDVal_IsInvalid(dest_prefix_arg) && !NCDVal_IsString(dest_prefix_arg))
91 ) {
92 ModuleLog(o->i, BLOG_ERROR, "wrong type");
93 goto fail0;
94 }
95  
96 // read dest
97 if (NCDVal_IsInvalid(dest_prefix_arg)) {
98 if (!ipaddr6_parse_ipv6_ifaddr(NCDVal_StringMemRef(dest_arg), &o->dest)) {
99 ModuleLog(o->i, BLOG_ERROR, "wrong CIDR notation dest");
100 goto fail0;
101 }
102 } else {
103 if (!ipaddr6_parse_ipv6_addr(NCDVal_StringMemRef(dest_arg), &o->dest.addr)) {
104 ModuleLog(o->i, BLOG_ERROR, "wrong dest addr");
105 goto fail0;
106 }
107 if (!ipaddr6_parse_ipv6_prefix(NCDVal_StringMemRef(dest_prefix_arg), &o->dest.prefix)) {
108 ModuleLog(o->i, BLOG_ERROR, "wrong dest prefix");
109 goto fail0;
110 }
111 }
112  
113 // read gateway and choose type
114 if (NCDVal_StringEquals(gateway_arg, "none")) {
115 o->type = TYPE_IFONLY;
116 }
117 else if (NCDVal_StringEquals(gateway_arg, "blackhole")) {
118 o->type = TYPE_BLACKHOLE;
119 } else {
120 if (!ipaddr6_parse_ipv6_addr(NCDVal_StringMemRef(gateway_arg), &o->gateway)) {
121 ModuleLog(o->i, BLOG_ERROR, "wrong gateway");
122 goto fail0;
123 }
124 o->type = TYPE_NORMAL;
125 }
126  
127 // read metric
128 uintmax_t metric;
129 if (!ncd_read_uintmax(metric_arg, &metric) || metric > INT_MAX) {
130 ModuleLog(i, BLOG_ERROR, "bad metric");
131 goto fail0;
132 }
133 o->metric = metric;
134  
135 // null terminate ifname
136 if (!NCDVal_StringNullTerminate(ifname_arg, &o->ifname_nts)) {
137 ModuleLog(i, BLOG_ERROR, "NCDVal_StringNullTerminate failed");
138 goto fail0;
139 }
140  
141 // add route
142 int res = 0; // to remove warning
143 switch (o->type) {
144 case TYPE_NORMAL:
145 res = NCDIfConfig_add_ipv6_route(o->dest, &o->gateway, o->metric, o->ifname_nts.data);
146 break;
147 case TYPE_IFONLY:
148 res = NCDIfConfig_add_ipv6_route(o->dest, NULL, o->metric, o->ifname_nts.data);
149 break;
150 case TYPE_BLACKHOLE:
151 res = NCDIfConfig_add_ipv6_blackhole_route(o->dest, o->metric);
152 break;
153 default: ASSERT(0);
154 }
155 if (!res) {
156 ModuleLog(o->i, BLOG_ERROR, "failed to add route");
157 goto fail1;
158 }
159  
160 // signal up
161 NCDModuleInst_Backend_Up(o->i);
162 return;
163  
164 fail1:
165 NCDValNullTermString_Free(&o->ifname_nts);
166 fail0:
167 NCDModuleInst_Backend_DeadError(i);
168 }
169  
170 static void func_die (void *vo)
171 {
172 struct instance *o = vo;
173  
174 // remove route
175 int res = 0; // to remove warning
176 switch (o->type) {
177 case TYPE_NORMAL:
178 res = NCDIfConfig_remove_ipv6_route(o->dest, &o->gateway, o->metric, o->ifname_nts.data);
179 break;
180 case TYPE_IFONLY:
181 res = NCDIfConfig_remove_ipv6_route(o->dest, NULL, o->metric, o->ifname_nts.data);
182 break;
183 case TYPE_BLACKHOLE:
184 res = NCDIfConfig_remove_ipv6_blackhole_route(o->dest, o->metric);
185 break;
186 default: ASSERT(0);
187 }
188 if (!res) {
189 ModuleLog(o->i, BLOG_ERROR, "failed to remove route");
190 }
191  
192 // free ifname nts
193 NCDValNullTermString_Free(&o->ifname_nts);
194  
195 NCDModuleInst_Backend_Dead(o->i);
196 }
197  
198 static struct NCDModule modules[] = {
199 {
200 .type = "net.ipv6.route",
201 .func_new2 = func_new,
202 .func_die = func_die,
203 .alloc_size = sizeof(struct instance)
204 }, {
205 .type = NULL
206 }
207 };
208  
209 const struct NCDModuleGroup ncdmodule_net_ipv6_route = {
210 .modules = modules
211 };