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      1 /*
      2  * f_basic.c		Basic Classifier
      3  *
      4  *		This program is free software; you can distribute 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 (at) 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 
     28 static void explain(void)
     29 {
     30 	fprintf(stderr, "Usage: ... basic [ match EMATCH_TREE ]\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 	fprintf(stderr, "       ACTION_SPEC := ... look at individual actions\n");
     36 	fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
     37 }
     38 
     39 static int basic_parse_opt(struct filter_util *qu, char *handle,
     40 			   int argc, char **argv, struct nlmsghdr *n)
     41 {
     42 	struct tcmsg *t = NLMSG_DATA(n);
     43 	struct rtattr *tail;
     44 	long h = 0;
     45 
     46 	if (handle) {
     47 		h = strtol(handle, NULL, 0);
     48 		if (h == LONG_MIN || h == LONG_MAX) {
     49 			fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
     50 			    handle);
     51 			return -1;
     52 		}
     53 	}
     54 	t->tcm_handle = h;
     55 
     56 	if (argc == 0)
     57 		return 0;
     58 
     59 	tail = (struct rtattr *)(((void *)n)+NLMSG_ALIGN(n->nlmsg_len));
     60 	addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
     61 
     62 	while (argc > 0) {
     63 		if (matches(*argv, "match") == 0) {
     64 			NEXT_ARG();
     65 			if (parse_ematch(&argc, &argv, TCA_BASIC_EMATCHES, n)) {
     66 				fprintf(stderr, "Illegal \"ematch\"\n");
     67 				return -1;
     68 			}
     69 			continue;
     70 		} else if (matches(*argv, "classid") == 0 ||
     71 			   strcmp(*argv, "flowid") == 0) {
     72 			unsigned int handle;
     73 
     74 			NEXT_ARG();
     75 			if (get_tc_classid(&handle, *argv)) {
     76 				fprintf(stderr, "Illegal \"classid\"\n");
     77 				return -1;
     78 			}
     79 			addattr_l(n, MAX_MSG, TCA_BASIC_CLASSID, &handle, 4);
     80 		} else if (matches(*argv, "action") == 0) {
     81 			NEXT_ARG();
     82 			if (parse_action(&argc, &argv, TCA_BASIC_ACT, n)) {
     83 				fprintf(stderr, "Illegal \"action\"\n");
     84 				return -1;
     85 			}
     86 			continue;
     87 
     88 		} else if (matches(*argv, "police") == 0) {
     89 			NEXT_ARG();
     90 			if (parse_police(&argc, &argv, TCA_BASIC_POLICE, n)) {
     91 				fprintf(stderr, "Illegal \"police\"\n");
     92 				return -1;
     93 			}
     94 			continue;
     95 		} else if (strcmp(*argv, "help") == 0) {
     96 			explain();
     97 			return -1;
     98 		} else {
     99 			fprintf(stderr, "What is \"%s\"?\n", *argv);
    100 			explain();
    101 			return -1;
    102 		}
    103 		argc--; argv++;
    104 	}
    105 
    106 	tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail;
    107 	return 0;
    108 }
    109 
    110 static int basic_print_opt(struct filter_util *qu, FILE *f,
    111 			   struct rtattr *opt, __u32 handle)
    112 {
    113 	struct rtattr *tb[TCA_BASIC_MAX+1];
    114 
    115 	if (opt == NULL)
    116 		return 0;
    117 
    118 	parse_rtattr_nested(tb, TCA_BASIC_MAX, opt);
    119 
    120 	if (handle)
    121 		fprintf(f, "handle 0x%x ", handle);
    122 
    123 	if (tb[TCA_BASIC_CLASSID]) {
    124 		SPRINT_BUF(b1);
    125 		fprintf(f, "flowid %s ",
    126 			sprint_tc_classid(rta_getattr_u32(tb[TCA_BASIC_CLASSID]), b1));
    127 	}
    128 
    129 	if (tb[TCA_BASIC_EMATCHES])
    130 		print_ematch(f, tb[TCA_BASIC_EMATCHES]);
    131 
    132 	if (tb[TCA_BASIC_POLICE]) {
    133 		fprintf(f, "\n");
    134 		tc_print_police(f, tb[TCA_BASIC_POLICE]);
    135 	}
    136 
    137 	if (tb[TCA_BASIC_ACT]) {
    138 		tc_print_action(f, tb[TCA_BASIC_ACT], 0);
    139 	}
    140 
    141 	return 0;
    142 }
    143 
    144 struct filter_util basic_filter_util = {
    145 	.id = "basic",
    146 	.parse_fopt = basic_parse_opt,
    147 	.print_fopt = basic_print_opt,
    148 };
    149