1/* 2 * f_basic.c Basic Classifier 3 * 4 * This program is free software; you can u32istribute 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: Thomas Graf <tgraf@suug.ch> 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> 23 24#include "utils.h" 25#include "tc_util.h" 26#include "m_ematch.h" 27 28static void explain(void) 29{ 30 fprintf(stderr, "Usage: ... basic [ match EMATCH_TREE ] [ police POLICE_SPEC ]\n"); 31 fprintf(stderr, " [ action ACTION_SPEC ] [ classid CLASSID ]\n"); 32 fprintf(stderr, "\n"); 33 fprintf(stderr, "Where: SELECTOR := SAMPLE SAMPLE ...\n"); 34 fprintf(stderr, " FILTERID := X:Y:Z\n"); 35} 36 37static int basic_parse_opt(struct filter_util *qu, char *handle, 38 int argc, char **argv, struct nlmsghdr *n) 39{ 40 struct tcmsg *t = NLMSG_DATA(n); 41 struct rtattr *tail; 42 long h = 0; 43 44 if (argc == 0) 45 return 0; 46 47 if (handle) { 48 h = strtol(handle, NULL, 0); 49 if (h == LONG_MIN || h == LONG_MAX) { 50 fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n", 51 handle); 52 return -1; 53 } 54 } 55 56 t->tcm_handle = h; 57 58 tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len)); 59 addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0); 60 61 while (argc > 0) { 62 if (matches(*argv, "match") == 0) { 63 NEXT_ARG(); 64 if (parse_ematch(&argc, &argv, TCA_BASIC_EMATCHES, n)) { 65 fprintf(stderr, "Illegal \"ematch\"\n"); 66 return -1; 67 } 68 continue; 69 } else if (matches(*argv, "classid") == 0 || 70 strcmp(*argv, "flowid") == 0) { 71 unsigned handle; 72 NEXT_ARG(); 73 if (get_tc_classid(&handle, *argv)) { 74 fprintf(stderr, "Illegal \"classid\"\n"); 75 return -1; 76 } 77 addattr_l(n, MAX_MSG, TCA_BASIC_CLASSID, &handle, 4); 78 } else if (matches(*argv, "action") == 0) { 79 NEXT_ARG(); 80 if (parse_action(&argc, &argv, TCA_BASIC_ACT, n)) { 81 fprintf(stderr, "Illegal \"action\"\n"); 82 return -1; 83 } 84 continue; 85 86 } else if (matches(*argv, "police") == 0) { 87 NEXT_ARG(); 88 if (parse_police(&argc, &argv, TCA_BASIC_POLICE, n)) { 89 fprintf(stderr, "Illegal \"police\"\n"); 90 return -1; 91 } 92 continue; 93 } else if (strcmp(*argv, "help") == 0) { 94 explain(); 95 return -1; 96 } else { 97 fprintf(stderr, "What is \"%s\"?\n", *argv); 98 explain(); 99 return -1; 100 } 101 argc--; argv++; 102 } 103 104 tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail; 105 return 0; 106} 107 108static int basic_print_opt(struct filter_util *qu, FILE *f, 109 struct rtattr *opt, __u32 handle) 110{ 111 struct rtattr *tb[TCA_BASIC_MAX+1]; 112 113 if (opt == NULL) 114 return 0; 115 116 parse_rtattr_nested(tb, TCA_BASIC_MAX, opt); 117 118 if (handle) 119 fprintf(f, "handle 0x%x ", handle); 120 121 if (tb[TCA_BASIC_CLASSID]) { 122 SPRINT_BUF(b1); 123 fprintf(f, "flowid %s ", 124 sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_BASIC_CLASSID]), b1)); 125 } 126 127 if (tb[TCA_BASIC_EMATCHES]) 128 print_ematch(f, tb[TCA_BASIC_EMATCHES]); 129 130 if (tb[TCA_BASIC_POLICE]) { 131 fprintf(f, "\n"); 132 tc_print_police(f, tb[TCA_BASIC_POLICE]); 133 } 134 135 if (tb[TCA_BASIC_ACT]) { 136 tc_print_action(f, tb[TCA_BASIC_ACT]); 137 } 138 139 return 0; 140} 141 142struct filter_util basic_filter_util = { 143 .id = "basic", 144 .parse_fopt = basic_parse_opt, 145 .print_fopt = basic_print_opt, 146}; 147