Bart De Schuymer | 1abc55d | 2002-06-01 19:23:47 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Summary: ebt_vlan userspace module |
| 3 | * |
| 4 | * Description: 802.1Q Virtual LAN match support module for ebtables project. |
| 5 | * Enable to match 802.1Q VLAN tagged frames by VLAN numeric |
| 6 | * identifier (12-bites field) and frame priority (3-bites field) |
| 7 | * |
| 8 | * Authors: |
| 9 | * Bart De Schuymer <bart.de.schuymer@pandora.be> |
| 10 | * Nick Fedchik <nick@fedchik.org.ua> |
| 11 | * |
| 12 | * May, 2002 |
| 13 | */ |
| 14 | |
| 15 | #include <stdio.h> |
| 16 | #include <string.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <sys/socket.h> |
| 19 | #include <netinet/in.h> |
| 20 | #include <linux/netfilter_bridge/ebtables.h> |
| 21 | #include <getopt.h> |
| 22 | #include "../include/ebtables_u.h" |
| 23 | #include <linux/netfilter_bridge/ebt_vlan.h> |
| 24 | |
| 25 | #define VLAN_ID '1' |
| 26 | #define VLAN_PRIO '2' |
| 27 | |
| 28 | static struct option opts[] = { |
| 29 | {"vlan-id", required_argument, 0, VLAN_ID}, |
| 30 | {"vlan-prio", required_argument, 0, VLAN_PRIO}, |
| 31 | {0} |
| 32 | }; |
| 33 | |
| 34 | /* |
| 35 | * Print out help for ebtables -h vlan |
| 36 | */ |
| 37 | static void print_help () |
| 38 | { |
| 39 | printf ("802.1Q VLAN options:\n" |
| 40 | "--vlan-id [!] id : VLAN ID 1-4095 (integer)\n" |
| 41 | "--vlan-prio [!] prio : VLAN Priority 0-7 (integer)\n"); |
| 42 | } |
| 43 | |
| 44 | /* |
| 45 | * Initialization function |
| 46 | */ |
| 47 | static void init (struct ebt_entry_match *match) |
| 48 | { |
| 49 | struct ebt_vlan_info *vlaninfo = |
| 50 | (struct ebt_vlan_info *) match->data; |
| 51 | /* |
| 52 | * Just clean initial values |
| 53 | */ |
| 54 | vlaninfo->id = 0; |
| 55 | vlaninfo->prio = 0; |
| 56 | vlaninfo->invflags = 0; |
| 57 | vlaninfo->bitmask = 0; |
| 58 | } |
| 59 | |
| 60 | #define OPT_VLAN_ID 0x01 |
| 61 | #define OPT_VLAN_PRIO 0x02 |
| 62 | static int |
| 63 | parse (int c, char **argv, int argc, |
| 64 | const struct ebt_u_entry *entry, unsigned int *flags, |
| 65 | struct ebt_entry_match **match) |
| 66 | { |
| 67 | struct ebt_vlan_info *vlaninfo = |
| 68 | (struct ebt_vlan_info *) (*match)->data; |
| 69 | unsigned short i; |
| 70 | char *end; |
| 71 | |
| 72 | switch (c) { |
| 73 | case VLAN_ID: |
| 74 | check_option (flags, OPT_VLAN_ID); |
| 75 | /* |
| 76 | * Check If we got inversed arg for VID, |
| 77 | * otherwise unset inversion flag |
| 78 | */ |
| 79 | if (check_inverse (optarg)) |
| 80 | vlaninfo->invflags |= EBT_VLAN_ID; |
| 81 | /* |
| 82 | * Check arg value presense |
| 83 | */ |
| 84 | if (optind > argc) |
| 85 | print_error ("Missing VLAN ID argument\n"); |
| 86 | /* |
| 87 | * Convert argv to long int, |
| 88 | * set *end to end of argv string, |
| 89 | * base set 10 for decimal only |
| 90 | */ |
| 91 | (unsigned short) i = strtol (argv[optind - 1], &end, 10); |
| 92 | /* |
| 93 | * Check arg val range |
| 94 | */ |
| 95 | if (i < 1 || i >= 4096 || *end != '\0') { |
| 96 | i = 0; |
| 97 | print_error |
| 98 | ("Problem with specified VLAN ID range\n"); |
| 99 | } |
| 100 | vlaninfo->id = i; |
| 101 | vlaninfo->bitmask|=EBT_VLAN_ID; |
| 102 | break; |
| 103 | |
| 104 | case VLAN_PRIO: |
| 105 | check_option (flags, OPT_VLAN_PRIO); |
| 106 | if (check_inverse (optarg)) |
| 107 | vlaninfo->invflags |= EBT_VLAN_PRIO; |
| 108 | if (optind > argc) |
| 109 | print_error |
| 110 | ("Missing VLAN Priority level argument\n"); |
| 111 | /* |
| 112 | * Convert argv to long int, |
| 113 | * set *end to end of argv string, |
| 114 | * base set 10 for decimal only |
| 115 | */ |
| 116 | (unsigned short) i = strtol (argv[optind - 1], &end, 10); |
| 117 | /* |
| 118 | * Check arg val range |
| 119 | */ |
| 120 | if (i >= 8 || *end != '\0') { |
| 121 | i = 0; |
| 122 | print_error |
| 123 | ("Problem with specified VLAN Priority range\n"); |
| 124 | } |
| 125 | vlaninfo->prio = i; |
| 126 | vlaninfo->bitmask|=EBT_VLAN_PRIO; |
| 127 | break; |
| 128 | |
| 129 | default: |
| 130 | return 0; |
| 131 | } |
| 132 | return 1; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Final check |
| 137 | */ |
| 138 | static void |
| 139 | final_check (const struct ebt_u_entry *entry, |
| 140 | const struct ebt_entry_match *match, |
| 141 | const char *name, unsigned int hook) |
| 142 | { |
| 143 | /* |
| 144 | * Is any proto supplied there? Or specified proto isn't 802.1Q? |
| 145 | */ |
| 146 | if (entry->bitmask & EBT_NOPROTO || entry->ethproto != ETH_P_8021Q) |
| 147 | print_error |
| 148 | ("For matching 802.1Q VLAN the protocol must be specified as 802_1Q\n"); |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * Print line when listing rules by ebtables -L |
| 153 | */ |
| 154 | static void |
| 155 | print (const struct ebt_u_entry *entry, |
| 156 | const struct ebt_entry_match *match) |
| 157 | { |
| 158 | struct ebt_vlan_info *vlaninfo = |
| 159 | (struct ebt_vlan_info *) match->data; |
| 160 | |
| 161 | /* |
| 162 | * Print VLAN ID if they are specified |
| 163 | */ |
| 164 | if (vlaninfo->bitmask & EBT_VLAN_ID) { |
| 165 | printf ("vlan id: %s%d, ", |
| 166 | vlaninfo->invflags & EBT_VLAN_ID ? "!" : "", |
| 167 | vlaninfo->id); |
| 168 | } |
| 169 | /* |
| 170 | * Print VLAN priority if they are specified |
| 171 | */ |
| 172 | if (vlaninfo->bitmask & EBT_VLAN_PRIO) { |
| 173 | printf ("vlan prio: %s%d, ", |
| 174 | vlaninfo->invflags & EBT_VLAN_PRIO ? "!" : "", |
| 175 | vlaninfo->prio); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | |
| 180 | static int |
| 181 | compare (const struct ebt_entry_match *vlan1, |
| 182 | const struct ebt_entry_match *vlan2) |
| 183 | { |
| 184 | struct ebt_vlan_info *vlaninfo1 = |
| 185 | (struct ebt_vlan_info *) vlan1->data; |
| 186 | struct ebt_vlan_info *vlaninfo2 = |
| 187 | (struct ebt_vlan_info *) vlan2->data; |
| 188 | /* |
| 189 | * Compare argc |
| 190 | */ |
| 191 | if (vlaninfo1->bitmask != vlaninfo2->bitmask) |
| 192 | return 0; |
| 193 | /* |
| 194 | * Compare inv flags |
| 195 | */ |
| 196 | if (vlaninfo1->invflags != vlaninfo2->invflags) |
| 197 | return 0; |
| 198 | /* |
| 199 | * Compare VLAN ID if they are present |
| 200 | */ |
| 201 | if (vlaninfo1->bitmask & EBT_VLAN_ID) { |
| 202 | if (vlaninfo1->id != vlaninfo2->id) |
| 203 | return 0; |
| 204 | }; |
| 205 | /* |
| 206 | * Compare VLAN Prio if they are present |
| 207 | */ |
| 208 | if (vlaninfo1->bitmask & EBT_VLAN_PRIO) { |
| 209 | if (vlaninfo1->prio != vlaninfo2->prio) |
| 210 | return 0; |
| 211 | }; |
| 212 | return 1; |
| 213 | } |
| 214 | |
| 215 | static struct ebt_u_match vlan_match = { |
| 216 | EBT_VLAN_MATCH, |
| 217 | sizeof (struct ebt_vlan_info), |
| 218 | print_help, |
| 219 | init, |
| 220 | parse, |
| 221 | final_check, |
| 222 | print, |
| 223 | compare, |
| 224 | opts, |
| 225 | }; |
| 226 | |
| 227 | static void _init (void) __attribute__ ((constructor)); |
| 228 | static void _init (void) |
| 229 | { |
| 230 | register_match (&vlan_match); |
| 231 | } |