1/* 2 * f_fw.c FW filter. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 10 * 11 */ 12 13#include <stdio.h> 14#include <stdlib.h> 15#include <unistd.h> 16#include <syslog.h> 17#include <fcntl.h> 18#include <sys/socket.h> 19#include <netinet/in.h> 20#include <arpa/inet.h> 21#include <string.h> 22#include <linux/if.h> /* IFNAMSIZ */ 23#include "utils.h" 24#include "tc_util.h" 25 26static void explain(void) 27{ 28 fprintf(stderr, "Usage: ... fw [ classid CLASSID ] [ police POLICE_SPEC ]\n"); 29 fprintf(stderr, " POLICE_SPEC := ... look at TBF\n"); 30 fprintf(stderr, " CLASSID := X:Y\n"); 31} 32 33#define usage() return(-1) 34 35static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n) 36{ 37 struct tc_police tp; 38 struct tcmsg *t = NLMSG_DATA(n); 39 struct rtattr *tail; 40 41 memset(&tp, 0, sizeof(tp)); 42 43 if (handle) { 44 if (get_u32(&t->tcm_handle, handle, 0)) { 45 fprintf(stderr, "Illegal \"handle\"\n"); 46 return -1; 47 } 48 } 49 50 if (argc == 0) 51 return 0; 52 53 tail = NLMSG_TAIL(n); 54 addattr_l(n, 4096, TCA_OPTIONS, NULL, 0); 55 56 while (argc > 0) { 57 if (matches(*argv, "classid") == 0 || 58 matches(*argv, "flowid") == 0) { 59 unsigned handle; 60 NEXT_ARG(); 61 if (get_tc_classid(&handle, *argv)) { 62 fprintf(stderr, "Illegal \"classid\"\n"); 63 return -1; 64 } 65 addattr_l(n, 4096, TCA_FW_CLASSID, &handle, 4); 66 } else if (matches(*argv, "police") == 0) { 67 NEXT_ARG(); 68 if (parse_police(&argc, &argv, TCA_FW_POLICE, n)) { 69 fprintf(stderr, "Illegal \"police\"\n"); 70 return -1; 71 } 72 continue; 73 } else if (matches(*argv, "action") == 0) { 74 NEXT_ARG(); 75 if (parse_action(&argc, &argv, TCA_FW_ACT, n)) { 76 fprintf(stderr, "Illegal fw \"action\"\n"); 77 return -1; 78 } 79 continue; 80 } else if (strcmp(*argv, "indev") == 0) { 81 char d[IFNAMSIZ+1]; 82 memset(d, 0, sizeof (d)); 83 argc--; 84 argv++; 85 if (argc < 1) { 86 fprintf(stderr, "Illegal indev\n"); 87 return -1; 88 } 89 strncpy(d, *argv, sizeof (d) - 1); 90 addattr_l(n, MAX_MSG, TCA_FW_INDEV, d, strlen(d) + 1); 91 } else if (strcmp(*argv, "help") == 0) { 92 explain(); 93 return -1; 94 } else { 95 fprintf(stderr, "What is \"%s\"?\n", *argv); 96 explain(); 97 return -1; 98 } 99 argc--; argv++; 100 } 101 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; 102 return 0; 103} 104 105static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle) 106{ 107 struct rtattr *tb[TCA_FW_MAX+1]; 108 109 if (opt == NULL) 110 return 0; 111 112 parse_rtattr_nested(tb, TCA_FW_MAX, opt); 113 114 if (handle) 115 fprintf(f, "handle 0x%x ", handle); 116 117 if (tb[TCA_FW_CLASSID]) { 118 SPRINT_BUF(b1); 119 fprintf(f, "classid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_FW_CLASSID]), b1)); 120 } 121 122 if (tb[TCA_FW_POLICE]) 123 tc_print_police(f, tb[TCA_FW_POLICE]); 124 if (tb[TCA_FW_INDEV]) { 125 struct rtattr *idev = tb[TCA_FW_INDEV]; 126 fprintf(f, "input dev %s ",(char *)RTA_DATA(idev)); 127 } 128 129 if (tb[TCA_FW_ACT]) { 130 fprintf(f, "\n"); 131 tc_print_action(f, tb[TCA_FW_ACT]); 132 } 133 return 0; 134} 135 136struct filter_util fw_filter_util = { 137 .id = "fw", 138 .parse_fopt = fw_parse_opt, 139 .print_fopt = fw_print_opt, 140}; 141