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      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 (at) 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 
     26 static 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 	fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
     32 }
     33 
     34 static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
     35 {
     36 	struct tc_police tp;
     37 	struct tcmsg *t = NLMSG_DATA(n);
     38 	struct rtattr *tail;
     39 	__u32 mask = 0;
     40 	int mask_set = 0;
     41 
     42 	memset(&tp, 0, sizeof(tp));
     43 
     44 	if (handle) {
     45 		char *slash;
     46 		if ((slash = strchr(handle, '/')) != NULL)
     47 			*slash = '\0';
     48 		if (get_u32(&t->tcm_handle, handle, 0)) {
     49 			fprintf(stderr, "Illegal \"handle\"\n");
     50 			return -1;
     51 		}
     52 		if (slash) {
     53 			if (get_u32(&mask, slash+1, 0)) {
     54 				fprintf(stderr, "Illegal \"handle\" mask\n");
     55 				return -1;
     56 			}
     57 			mask_set = 1;
     58 		}
     59 	}
     60 
     61 	if (argc == 0)
     62 		return 0;
     63 
     64 	tail = NLMSG_TAIL(n);
     65 	addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
     66 
     67 	if (mask_set)
     68 		addattr32(n, MAX_MSG, TCA_FW_MASK, mask);
     69 
     70 	while (argc > 0) {
     71 		if (matches(*argv, "classid") == 0 ||
     72 		    matches(*argv, "flowid") == 0) {
     73 			unsigned handle;
     74 			NEXT_ARG();
     75 			if (get_tc_classid(&handle, *argv)) {
     76 				fprintf(stderr, "Illegal \"classid\"\n");
     77 				return -1;
     78 			}
     79 			addattr_l(n, 4096, TCA_FW_CLASSID, &handle, 4);
     80 		} else if (matches(*argv, "police") == 0) {
     81 			NEXT_ARG();
     82 			if (parse_police(&argc, &argv, TCA_FW_POLICE, n)) {
     83 				fprintf(stderr, "Illegal \"police\"\n");
     84 				return -1;
     85 			}
     86 			continue;
     87 		} else if (matches(*argv, "action") == 0) {
     88 			NEXT_ARG();
     89 			if (parse_action(&argc, &argv, TCA_FW_ACT, n)) {
     90 				fprintf(stderr, "Illegal fw \"action\"\n");
     91 				return -1;
     92 			}
     93 			continue;
     94 		} else if (strcmp(*argv, "indev") == 0) {
     95 			char d[IFNAMSIZ+1];
     96 			memset(d, 0, sizeof (d));
     97 			argc--;
     98 			argv++;
     99 			if (argc < 1) {
    100 				fprintf(stderr, "Illegal indev\n");
    101 				return -1;
    102 			}
    103 			strncpy(d, *argv, sizeof (d) - 1);
    104 			addattr_l(n, MAX_MSG, TCA_FW_INDEV, d, strlen(d) + 1);
    105 		} else if (strcmp(*argv, "help") == 0) {
    106 			explain();
    107 			return -1;
    108 		} else {
    109 			fprintf(stderr, "What is \"%s\"?\n", *argv);
    110 			explain();
    111 			return -1;
    112 		}
    113 		argc--; argv++;
    114 	}
    115 	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
    116 	return 0;
    117 }
    118 
    119 static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
    120 {
    121 	struct rtattr *tb[TCA_FW_MAX+1];
    122 
    123 	if (opt == NULL)
    124 		return 0;
    125 
    126 	parse_rtattr_nested(tb, TCA_FW_MAX, opt);
    127 
    128 	if (handle || tb[TCA_FW_MASK]) {
    129 		__u32 mark = 0, mask = 0;
    130 		if(handle)
    131 			mark = handle;
    132 		if(tb[TCA_FW_MASK] &&
    133 		    (mask = *(__u32*)RTA_DATA(tb[TCA_FW_MASK])) != 0xFFFFFFFF)
    134 			fprintf(f, "handle 0x%x/0x%x ", mark, mask);
    135 		else
    136 			fprintf(f, "handle 0x%x ", handle);
    137 	}
    138 
    139 	if (tb[TCA_FW_CLASSID]) {
    140 		SPRINT_BUF(b1);
    141 		fprintf(f, "classid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_FW_CLASSID]), b1));
    142 	}
    143 
    144 	if (tb[TCA_FW_POLICE])
    145 		tc_print_police(f, tb[TCA_FW_POLICE]);
    146 	if (tb[TCA_FW_INDEV]) {
    147 		struct rtattr *idev = tb[TCA_FW_INDEV];
    148 		fprintf(f, "input dev %s ",(char *)RTA_DATA(idev));
    149 	}
    150 
    151 	if (tb[TCA_FW_ACT]) {
    152 		fprintf(f, "\n");
    153 		tc_print_action(f, tb[TCA_FW_ACT]);
    154 	}
    155 	return 0;
    156 }
    157 
    158 struct filter_util fw_filter_util = {
    159 	.id = "fw",
    160 	.parse_fopt = fw_parse_opt,
    161 	.print_fopt = fw_print_opt,
    162 };
    163