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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 #define usage() return(-1)
     35 
     36 static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
     37 {
     38 	struct tc_police tp;
     39 	struct tcmsg *t = NLMSG_DATA(n);
     40 	struct rtattr *tail;
     41 	__u32 mask = 0;
     42 	int mask_set = 0;
     43 
     44 	memset(&tp, 0, sizeof(tp));
     45 
     46 	if (handle) {
     47 		char *slash;
     48 		if ((slash = strchr(handle, '/')) != NULL)
     49 			*slash = '\0';
     50 		if (get_u32(&t->tcm_handle, handle, 0)) {
     51 			fprintf(stderr, "Illegal \"handle\"\n");
     52 			return -1;
     53 		}
     54 		if (slash) {
     55 			if (get_u32(&mask, slash+1, 0)) {
     56 				fprintf(stderr, "Illegal \"handle\" mask\n");
     57 				return -1;
     58 			}
     59 			mask_set = 1;
     60 		}
     61 	}
     62 
     63 	if (argc == 0)
     64 		return 0;
     65 
     66 	tail = NLMSG_TAIL(n);
     67 	addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
     68 
     69 	if (mask_set)
     70 		addattr32(n, MAX_MSG, TCA_FW_MASK, mask);
     71 
     72 	while (argc > 0) {
     73 		if (matches(*argv, "classid") == 0 ||
     74 		    matches(*argv, "flowid") == 0) {
     75 			unsigned handle;
     76 			NEXT_ARG();
     77 			if (get_tc_classid(&handle, *argv)) {
     78 				fprintf(stderr, "Illegal \"classid\"\n");
     79 				return -1;
     80 			}
     81 			addattr_l(n, 4096, TCA_FW_CLASSID, &handle, 4);
     82 		} else if (matches(*argv, "police") == 0) {
     83 			NEXT_ARG();
     84 			if (parse_police(&argc, &argv, TCA_FW_POLICE, n)) {
     85 				fprintf(stderr, "Illegal \"police\"\n");
     86 				return -1;
     87 			}
     88 			continue;
     89 		} else if (matches(*argv, "action") == 0) {
     90 			NEXT_ARG();
     91 			if (parse_action(&argc, &argv, TCA_FW_ACT, n)) {
     92 				fprintf(stderr, "Illegal fw \"action\"\n");
     93 				return -1;
     94 			}
     95 			continue;
     96 		} else if (strcmp(*argv, "indev") == 0) {
     97 			char d[IFNAMSIZ+1];
     98 			memset(d, 0, sizeof (d));
     99 			argc--;
    100 			argv++;
    101 			if (argc < 1) {
    102 				fprintf(stderr, "Illegal indev\n");
    103 				return -1;
    104 			}
    105 			strncpy(d, *argv, sizeof (d) - 1);
    106 			addattr_l(n, MAX_MSG, TCA_FW_INDEV, d, strlen(d) + 1);
    107 		} else if (strcmp(*argv, "help") == 0) {
    108 			explain();
    109 			return -1;
    110 		} else {
    111 			fprintf(stderr, "What is \"%s\"?\n", *argv);
    112 			explain();
    113 			return -1;
    114 		}
    115 		argc--; argv++;
    116 	}
    117 	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
    118 	return 0;
    119 }
    120 
    121 static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
    122 {
    123 	struct rtattr *tb[TCA_FW_MAX+1];
    124 
    125 	if (opt == NULL)
    126 		return 0;
    127 
    128 	parse_rtattr_nested(tb, TCA_FW_MAX, opt);
    129 
    130 	if (handle || tb[TCA_FW_MASK]) {
    131 		__u32 mark = 0, mask = 0;
    132 		if(handle)
    133 			mark = handle;
    134 		if(tb[TCA_FW_MASK] &&
    135 		    (mask = *(__u32*)RTA_DATA(tb[TCA_FW_MASK])) != 0xFFFFFFFF)
    136 			fprintf(f, "handle 0x%x/0x%x ", mark, mask);
    137 		else
    138 			fprintf(f, "handle 0x%x ", handle);
    139 	}
    140 
    141 	if (tb[TCA_FW_CLASSID]) {
    142 		SPRINT_BUF(b1);
    143 		fprintf(f, "classid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_FW_CLASSID]), b1));
    144 	}
    145 
    146 	if (tb[TCA_FW_POLICE])
    147 		tc_print_police(f, tb[TCA_FW_POLICE]);
    148 	if (tb[TCA_FW_INDEV]) {
    149 		struct rtattr *idev = tb[TCA_FW_INDEV];
    150 		fprintf(f, "input dev %s ",(char *)RTA_DATA(idev));
    151 	}
    152 
    153 	if (tb[TCA_FW_ACT]) {
    154 		fprintf(f, "\n");
    155 		tc_print_action(f, tb[TCA_FW_ACT]);
    156 	}
    157 	return 0;
    158 }
    159 
    160 struct filter_util fw_filter_util = {
    161 	.id = "fw",
    162 	.parse_fopt = fw_parse_opt,
    163 	.print_fopt = fw_print_opt,
    164 };
    165