iprule.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19
  20 #include <arpa/inet.h>
  21
  22 #include "netifd.h"
  23 #include "device.h"
  24 #include "interface.h"
  25 #include "iprule.h"
  26 #include "proto.h"
  27 #include "ubus.h"
  28 #include "system.h"
  29
  30 struct vlist_tree iprules;
  31 static bool iprules_flushed = false;
  32
  33 enum {
  34         RULE_INTERFACE_IN,
  35         RULE_INTERFACE_OUT,
  36         RULE_INVERT,
  37         RULE_SRC,
  38         RULE_DEST,
  39         RULE_PRIORITY,
  40         RULE_TOS,
  41         RULE_FWMARK,
  42         RULE_LOOKUP,
  43         RULE_ACTION,
  44         RULE_GOTO,
  45         __RULE_MAX
  46 };
  47
  48 static const struct blobmsg_policy rule_attr[__RULE_MAX] = {
  49         [RULE_INTERFACE_IN] = { .name = "in", .type = BLOBMSG_TYPE_STRING },
  50         [RULE_INTERFACE_OUT] = { .name = "out", .type = BLOBMSG_TYPE_STRING },
  51         [RULE_INVERT] = { .name = "invert", .type = BLOBMSG_TYPE_BOOL },
  52         [RULE_SRC] = { .name = "src", .type = BLOBMSG_TYPE_STRING },
  53         [RULE_DEST] = { .name = "dest", .type = BLOBMSG_TYPE_STRING },
  54         [RULE_PRIORITY] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
  55         [RULE_TOS] = { .name = "tos", .type = BLOBMSG_TYPE_INT32 },
  56         [RULE_FWMARK] = { .name = "mark", .type = BLOBMSG_TYPE_STRING },
  57         [RULE_LOOKUP] = { .name = "lookup", .type = BLOBMSG_TYPE_STRING },
  58         [RULE_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_STRING },
  59         [RULE_GOTO]   = { .name = "goto", .type = BLOBMSG_TYPE_INT32 },
  60 };
  61
  62 const struct config_param_list rule_attr_list = {
  63         .n_params = __RULE_MAX,
  64         .params = rule_attr,
  65 };
  66
  67
  68 static bool
  69 iprule_parse_mark(const char *mark, struct iprule *rule)
  70 {
  71         char *s, *e;
  72         unsigned int n;
  73
  74         if ((s = strchr(mark, '/')) != NULL)
  75                 *s++ = 0;
  76
  77         n = strtoul(mark, &e, 0);
  78
  79         if (e == mark || *e)
  80                 return false;
  81
  82         rule->fwmark = n;
  83         rule->flags |= IPRULE_FWMARK;
  84
  85         if (s) {
  86                 n = strtoul(s, &e, 0);
  87
  88                 if (e == s || *e)
  89                         return false;
  90
  91                 rule->fwmask = n;
  92                 rule->flags |= IPRULE_FWMASK;
  93         }
  94
  95         return true;
  96 }
  97
  98 void
  99 iprule_add(struct blob_attr *attr, bool v6)
 100 {
 101         struct interface *iif = NULL, *oif = NULL;
 102         struct blob_attr *tb[__RULE_MAX], *cur;
 103         struct interface *iface;
 104         struct iprule *rule;
 105         int af = v6 ? AF_INET6 : AF_INET;
 106
 107         blobmsg_parse(rule_attr, __RULE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 108
 109         rule = calloc(1, sizeof(*rule));
 110         if (!rule)
 111                 return;
 112
 113         rule->flags = v6 ? IPRULE_INET6 : IPRULE_INET4;
 114
 115         if ((cur = tb[RULE_INVERT]) != NULL)
 116                 rule->invert = blobmsg_get_bool(cur);
 117
 118         if ((cur = tb[RULE_INTERFACE_IN]) != NULL) {
 119                 iif = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 120
 121                 if (!iif || !iif->l3_dev.dev) {
 122                         DPRINTF("Failed to resolve device of network: %s\n", (char *) blobmsg_data(cur));
 123                         goto error;
 124                 }
 125
 126                 memcpy(rule->in_dev, iif->l3_dev.dev->ifname, sizeof(rule->in_dev));
 127                 rule->flags |= IPRULE_IN;
 128         }
 129
 130         if ((cur = tb[RULE_INTERFACE_OUT]) != NULL) {
 131                 oif = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 132
 133                 if (!oif || !oif->l3_dev.dev) {
 134                         DPRINTF("Failed to resolve device of network: %s\n", (char *) blobmsg_data(cur));
 135                         goto error;
 136                 }
 137
 138                 memcpy(rule->out_dev, oif->l3_dev.dev->ifname, sizeof(rule->out_dev));
 139                 rule->flags |= IPRULE_OUT;
 140         }
 141
 142         if ((cur = tb[RULE_SRC]) != NULL) {
 143                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &rule->src_addr, &rule->src_mask)) {
 144                         DPRINTF("Failed to parse rule source: %s\n", (char *) blobmsg_data(cur));
 145                         goto error;
 146                 }
 147                 rule->flags |= IPRULE_SRC;
 148         }
 149
 150         if ((cur = tb[RULE_DEST]) != NULL) {
 151                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &rule->dest_addr, &rule->dest_mask)) {
 152                         DPRINTF("Failed to parse rule destination: %s\n", (char *) blobmsg_data(cur));
 153                         goto error;
 154                 }
 155                 rule->flags |= IPRULE_DEST;
 156         }
 157
 158         if ((cur = tb[RULE_PRIORITY]) != NULL) {
 159                 rule->priority = blobmsg_get_u32(cur);
 160                 rule->flags |= IPRULE_PRIORITY;
 161         }
 162
 163         if ((cur = tb[RULE_TOS]) != NULL) {
 164                 if ((rule->tos = blobmsg_get_u32(cur)) > 255) {
 165                         DPRINTF("Invalid TOS value: %u\n", blobmsg_get_u32(cur));
 166                         goto error;
 167                 }
 168                 rule->flags |= IPRULE_TOS;
 169         }
 170
 171         if ((cur = tb[RULE_FWMARK]) != NULL) {
 172                 if (!iprule_parse_mark(blobmsg_data(cur), rule)) {
 173                         DPRINTF("Failed to parse rule fwmark: %s\n", (char *) blobmsg_data(cur));
 174                         goto error;
 175                 }
 176                 /* flags set by iprule_parse_mark() */
 177         }
 178
 179         if ((cur = tb[RULE_LOOKUP]) != NULL) {
 180                 if (!system_resolve_rt_table(blobmsg_data(cur), &rule->lookup)) {
 181                         DPRINTF("Failed to parse rule lookup table: %s\n", (char *) blobmsg_data(cur));
 182                         goto error;
 183                 }
 184                 rule->flags |= IPRULE_LOOKUP;
 185         }
 186
 187         if ((cur = tb[RULE_ACTION]) != NULL) {
 188                 if (!system_resolve_iprule_action(blobmsg_data(cur), &rule->action)) {
 189                         DPRINTF("Failed to parse rule action: %s\n", (char *) blobmsg_data(cur));
 190                         goto error;
 191                 }
 192                 rule->flags |= IPRULE_ACTION;
 193         }
 194
 195         if ((cur = tb[RULE_GOTO]) != NULL) {
 196                 rule->gotoid = blobmsg_get_u32(cur);
 197                 rule->flags |= IPRULE_GOTO;
 198         }
 199
 200         /* trigger flush of existing rules when adding first uci rule the first time */
 201         if (!iprules_flushed)
 202         {
 203                 system_flush_iprules();
 204                 iprules_flushed = true;
 205         }
 206
 207         vlist_add(&iprules, &rule->node, &rule->flags);
 208         return;
 209
 210 error:
 211         free(rule);
 212 }
 213
 214 void
 215 iprule_update_start(void)
 216 {
 217         vlist_update(&iprules);
 218 }
 219
 220 void
 221 iprule_update_complete(void)
 222 {
 223         vlist_flush(&iprules);
 224 }
 225
 226
 227 static int
 228 rule_cmp(const void *k1, const void *k2, void *ptr)
 229 {
 230         return memcmp(k1, k2, sizeof(struct iprule)-offsetof(struct iprule, flags));
 231 }
 232
 233 static void
 234 iprule_update_rule(struct vlist_tree *tree,
 235                    struct vlist_node *node_new, struct vlist_node *node_old)
 236 {
 237         struct iprule *rule_old, *rule_new;
 238
 239         rule_old = container_of(node_old, struct iprule, node);
 240         rule_new = container_of(node_new, struct iprule, node);
 241
 242         if (node_old) {
 243                 system_del_iprule(rule_old);
 244                 free(rule_old);
 245         }
 246
 247         if (node_new)
 248                 system_add_iprule(rule_new);
 249 }
 250
 251 static void __init
 252 iprule_init_list(void)
 253 {
 254         vlist_init(&iprules, rule_cmp, iprule_update_rule);
 255 }