| Marc Boucher | e6869a8 | 2000-03-20 06:03:29 +0000 | [diff] [blame] | 1 | /* Shared library add-on to iptables to add NFMARK matching support. */ |
| 2 | #include <stdio.h> |
| 3 | #include <netdb.h> |
| 4 | #include <string.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <getopt.h> |
| 7 | |
| 8 | #include <iptables.h> |
| 9 | #include <linux/netfilter_ipv4/ipt_mark.h> |
| 10 | |
| 11 | /* Function which prints out usage message. */ |
| 12 | static void |
| 13 | help(void) |
| 14 | { |
| 15 | printf( |
| 16 | "MARK match v%s options:\n" |
| 17 | "[!] --mark value[/mask] Match nfmark value with optional mask\n" |
| 18 | "\n", |
| 19 | NETFILTER_VERSION); |
| 20 | } |
| 21 | |
| 22 | static struct option opts[] = { |
| 23 | { "mark", 1, 0, '1' }, |
| 24 | {0} |
| 25 | }; |
| 26 | |
| 27 | /* Initialize the match. */ |
| 28 | static void |
| 29 | init(struct ipt_entry_match *m, unsigned int *nfcache) |
| 30 | { |
| 31 | /* Can't cache this. */ |
| 32 | *nfcache |= NFC_UNKNOWN; |
| 33 | } |
| 34 | |
| 35 | /* Function which parses command options; returns true if it |
| 36 | ate an option */ |
| 37 | static int |
| 38 | parse(int c, char **argv, int invert, unsigned int *flags, |
| 39 | const struct ipt_entry *entry, |
| 40 | unsigned int *nfcache, |
| 41 | struct ipt_entry_match **match) |
| 42 | { |
| 43 | struct ipt_mark_info *markinfo = (struct ipt_mark_info *)(*match)->data; |
| 44 | |
| 45 | switch (c) { |
| 46 | char *end; |
| 47 | case '1': |
| 48 | if (check_inverse(optarg, &invert)) |
| 49 | optind++; |
| 50 | markinfo->mark = strtoul(optarg, &end, 0); |
| 51 | if (*end == '/') { |
| 52 | markinfo->mask = strtoul(end+1, &end, 0); |
| 53 | } else |
| 54 | markinfo->mask = 0xffffffff; |
| 55 | if (*end != '\0' || end == optarg) |
| 56 | exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg); |
| 57 | if (invert) |
| 58 | markinfo->invert = 1; |
| 59 | *flags = 1; |
| 60 | break; |
| 61 | |
| 62 | default: |
| 63 | return 0; |
| 64 | } |
| 65 | return 1; |
| 66 | } |
| 67 | |
| 68 | static void |
| 69 | print_mark(unsigned long mark, unsigned long mask, int invert, int numeric) |
| 70 | { |
| 71 | if (invert) |
| 72 | fputc('!', stdout); |
| Rusty Russell | 7e53bf9 | 2000-03-20 07:03:28 +0000 | [diff] [blame^] | 73 | |
| Marc Boucher | e6869a8 | 2000-03-20 06:03:29 +0000 | [diff] [blame] | 74 | if(mask != 0xffffffff) |
| 75 | printf("0x%lx/0x%lx ", mark, mask); |
| 76 | else |
| 77 | printf("0x%lx ", mark); |
| 78 | } |
| 79 | |
| 80 | /* Final check; must have specified --mark. */ |
| 81 | static void |
| 82 | final_check(unsigned int flags) |
| 83 | { |
| 84 | if (!flags) |
| 85 | exit_error(PARAMETER_PROBLEM, |
| 86 | "MARK match: You must specify `--mark'"); |
| 87 | } |
| 88 | |
| 89 | /* Prints out the matchinfo. */ |
| 90 | static void |
| 91 | print(const struct ipt_ip *ip, |
| 92 | const struct ipt_entry_match *match, |
| 93 | int numeric) |
| 94 | { |
| 95 | printf("MARK match "); |
| 96 | print_mark(((struct ipt_mark_info *)match->data)->mark, |
| 97 | ((struct ipt_mark_info *)match->data)->mask, |
| 98 | ((struct ipt_mark_info *)match->data)->invert, numeric); |
| 99 | } |
| 100 | |
| 101 | /* Saves the union ipt_matchinfo in parsable form to stdout. */ |
| 102 | static void |
| 103 | save(const struct ipt_ip *ip, const struct ipt_entry_match *match) |
| 104 | { |
| 105 | printf("--mark "); |
| 106 | print_mark(((struct ipt_mark_info *)match->data)->mark, |
| 107 | ((struct ipt_mark_info *)match->data)->mask, |
| 108 | ((struct ipt_mark_info *)match->data)->invert, 0); |
| 109 | } |
| 110 | |
| 111 | struct iptables_match mark |
| 112 | = { NULL, |
| 113 | "mark", |
| 114 | NETFILTER_VERSION, |
| 115 | sizeof(struct ipt_mark_info), |
| 116 | &help, |
| 117 | &init, |
| 118 | &parse, |
| 119 | &final_check, |
| 120 | &print, |
| 121 | &save, |
| 122 | opts |
| 123 | }; |
| 124 | |
| 125 | void _init(void) |
| 126 | { |
| 127 | register_match(&mark); |
| 128 | } |