1/* 2 * Shared library add-on to iptables to add quota support 3 * 4 * Sam Johnston <samj@samj.net> 5 */ 6#include <stddef.h> 7#include <stdio.h> 8#include <stdlib.h> 9#include <getopt.h> 10#include <iptables.h> 11 12#include <linux/netfilter/xt_quota.h> 13#include <linux/netfilter_ipv4/ip_tables.h> 14 15static struct option opts[] = { 16 {"quota", 1, 0, '1'}, 17 {0} 18}; 19 20/* print usage */ 21static void 22help(void) 23{ 24 printf("quota options:\n" 25 " --quota quota quota (bytes)\n" "\n"); 26} 27 28/* print matchinfo */ 29static void 30print(const struct ipt_ip *ip, const struct ipt_entry_match *match, int numeric) 31{ 32 struct xt_quota_info *q = (struct xt_quota_info *) match->data; 33 printf("quota: %llu bytes", (unsigned long long) q->quota); 34} 35 36/* save matchinfo */ 37static void 38save(const struct ipt_ip *ip, const struct ipt_entry_match *match) 39{ 40 struct xt_quota_info *q = (struct xt_quota_info *) match->data; 41 printf("--quota %llu ", (unsigned long long) q->quota); 42} 43 44/* parse quota option */ 45static int 46parse_quota(const char *s, u_int64_t * quota) 47{ 48 *quota = strtoull(s, (char **) NULL, 10); 49 50#ifdef DEBUG_IPT_QUOTA 51 printf("Quota: %llu\n", *quota); 52#endif 53 54 if (*quota == -1) 55 exit_error(PARAMETER_PROBLEM, "quota invalid: '%s'\n", s); 56 else 57 return 1; 58} 59 60/* parse all options, returning true if we found any for us */ 61static int 62parse(int c, char **argv, int invert, unsigned int *flags, 63 const struct ipt_entry *entry, 64 unsigned int *nfcache, struct ipt_entry_match **match) 65{ 66 struct xt_quota_info *info = (struct xt_quota_info *) (*match)->data; 67 68 switch (c) { 69 case '1': 70 if (check_inverse(optarg, &invert, NULL, 0)) 71 exit_error(PARAMETER_PROBLEM, "quota: unexpected '!'"); 72 if (!parse_quota(optarg, &info->quota)) 73 exit_error(PARAMETER_PROBLEM, 74 "bad quota: '%s'", optarg); 75 break; 76 77 default: 78 return 0; 79 } 80 return 1; 81} 82 83/* no final check */ 84static void 85final_check(unsigned int flags) 86{ 87} 88 89struct iptables_match quota = { 90 .next = NULL, 91 .name = "quota", 92 .version = IPTABLES_VERSION, 93 .size = IPT_ALIGN(sizeof (struct xt_quota_info)), 94 .userspacesize = offsetof(struct xt_quota_info, quota), 95 .help = &help, 96 .parse = &parse, 97 .final_check = &final_check, 98 .print = &print, 99 .save = &save, 100 .extra_opts = opts 101}; 102 103void 104_init(void) 105{ 106 register_match("a); 107} 108