| /* Shared library add-on to iptables to add CLASSIFY target support. */ |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| |
| #include <iptables.h> |
| #include <linux/netfilter_ipv4/ip_tables.h> |
| #include <linux/netfilter_ipv4/ipt_CLASSIFY.h> |
| #include <linux/types.h> |
| #include <linux/pkt_sched.h> |
| |
| /* Function which prints out usage message. */ |
| static void |
| help(void) |
| { |
| printf( |
| "CLASSIFY target v%s options:\n" |
| " --set-class [MAJOR:MINOR] Set skb->priority value\n" |
| "\n", |
| IPTABLES_VERSION); |
| } |
| |
| static struct option opts[] = { |
| { "set-class", 1, 0, '1' }, |
| { 0 } |
| }; |
| |
| /* Initialize the target. */ |
| static void |
| init(struct ipt_entry_target *t, unsigned int *nfcache) |
| { |
| } |
| |
| int string_to_priority(const unsigned char *s, unsigned int *p) |
| { |
| unsigned int i, j; |
| |
| if (sscanf(s, "%x:%x", &i, &j) != 2) |
| return 1; |
| |
| *p = TC_H_MAKE(i<<16, j); |
| return 0; |
| } |
| |
| /* Function which parses command options; returns true if it |
| ate an option */ |
| static int |
| parse(int c, char **argv, int invert, unsigned int *flags, |
| const struct ipt_entry *entry, |
| struct ipt_entry_target **target) |
| { |
| struct ipt_classify_target_info *clinfo |
| = (struct ipt_classify_target_info *)(*target)->data; |
| |
| switch (c) { |
| case '1': |
| if (string_to_priority(optarg, &clinfo->priority)) |
| exit_error(PARAMETER_PROBLEM, |
| "Bad class value `%s'", optarg); |
| if (*flags) |
| exit_error(PARAMETER_PROBLEM, |
| "CLASSIFY: Can't specify --set-class twice"); |
| *flags = 1; |
| break; |
| |
| default: |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static void |
| final_check(unsigned int flags) |
| { |
| if (!flags) |
| exit_error(PARAMETER_PROBLEM, |
| "CLASSIFY: Parameter --set-class is required"); |
| } |
| |
| static void |
| print_class(unsigned int priority, int numeric) |
| { |
| printf("%x:%x ", TC_H_MAJ(priority)>>16, TC_H_MIN(priority)); |
| } |
| |
| /* Prints out the targinfo. */ |
| static void |
| print(const struct ipt_ip *ip, |
| const struct ipt_entry_target *target, |
| int numeric) |
| { |
| const struct ipt_classify_target_info *clinfo = |
| (const struct ipt_classify_target_info *)target->data; |
| printf("CLASSIFY set "); |
| print_class(clinfo->priority, numeric); |
| } |
| |
| /* Saves the union ipt_targinfo in parsable form to stdout. */ |
| static void |
| save(const struct ipt_ip *ip, const struct ipt_entry_target *target) |
| { |
| const struct ipt_classify_target_info *clinfo = |
| (const struct ipt_classify_target_info *)target->data; |
| |
| printf("--set-class %.4x:%.4x ", |
| TC_H_MAJ(clinfo->priority)>>16, TC_H_MIN(clinfo->priority)); |
| } |
| |
| static |
| struct iptables_target classify |
| = { NULL, |
| "CLASSIFY", |
| IPTABLES_VERSION, |
| IPT_ALIGN(sizeof(struct ipt_classify_target_info)), |
| IPT_ALIGN(sizeof(struct ipt_classify_target_info)), |
| &help, |
| &init, |
| &parse, |
| &final_check, |
| &print, |
| &save, |
| opts |
| }; |
| |
| void _init(void) |
| { |
| register_target(&classify); |
| } |