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      1 /*
      2  * f_tcindex.c		Traffic control index filter
      3  *
      4  * Written 1998,1999 by Werner Almesberger
      5  */
      6 
      7 #include <stdio.h>
      8 #include <stdlib.h>
      9 #include <unistd.h>
     10 #include <syslog.h>
     11 #include <fcntl.h>
     12 #include <string.h>
     13 #include <netinet/in.h>
     14 
     15 #include "utils.h"
     16 #include "tc_util.h"
     17 
     18 static void explain(void)
     19 {
     20 	fprintf(stderr," Usage: ... tcindex [ hash SIZE ] [ mask MASK ]"
     21 	    " [ shift SHIFT ]\n");
     22 	fprintf(stderr,"                    [ pass_on | fall_through ]\n");
     23 	fprintf(stderr,"                    [ classid CLASSID ] "
     24 	    "[ police POLICE_SPEC ]\n");
     25 }
     26 
     27 static int tcindex_parse_opt(struct filter_util *qu, char *handle, int argc,
     28     char **argv, struct nlmsghdr *n)
     29 {
     30 	struct tcmsg *t = NLMSG_DATA(n);
     31 	struct rtattr *tail;
     32 	char *end;
     33 
     34 	if (handle) {
     35 		t->tcm_handle = strtoul(handle,&end,0);
     36 		if (*end) {
     37 			fprintf(stderr, "Illegal filter ID\n");
     38 			return -1;
     39 		}
     40 	}
     41 	if (!argc) return 0;
     42 	tail = NLMSG_TAIL(n);
     43 	addattr_l(n,4096,TCA_OPTIONS,NULL,0);
     44 	while (argc) {
     45 		if (!strcmp(*argv,"hash")) {
     46 			int hash;
     47 
     48 			NEXT_ARG();
     49 			hash = strtoul(*argv,&end,0);
     50 			if (*end || !hash || hash > 0x10000) {
     51 				explain();
     52 				return -1;
     53 			}
     54 			addattr_l(n,4096,TCA_TCINDEX_HASH,&hash,sizeof(hash));
     55 		}
     56 		else if (!strcmp(*argv,"mask")) {
     57 			__u16 mask;
     58 
     59 			NEXT_ARG();
     60 			mask = strtoul(*argv,&end,0);
     61 			if (*end) {
     62 				explain();
     63 				return -1;
     64 			}
     65 			addattr_l(n,4096,TCA_TCINDEX_MASK,&mask,sizeof(mask));
     66 		}
     67 		else if (!strcmp(*argv,"shift")) {
     68 			int shift;
     69 
     70 			NEXT_ARG();
     71 			shift = strtoul(*argv,&end,0);
     72 			if (*end) {
     73 				explain();
     74 				return -1;
     75 			}
     76 			addattr_l(n,4096,TCA_TCINDEX_SHIFT,&shift,
     77 			    sizeof(shift));
     78 		}
     79 		else if (!strcmp(*argv,"fall_through")) {
     80 			int value = 1;
     81 
     82 			addattr_l(n,4096,TCA_TCINDEX_FALL_THROUGH,&value,
     83 			    sizeof(value));
     84 		}
     85 		else if (!strcmp(*argv,"pass_on")) {
     86 			int value = 0;
     87 
     88 			addattr_l(n,4096,TCA_TCINDEX_FALL_THROUGH,&value,
     89 			    sizeof(value));
     90 		}
     91 		else if (!strcmp(*argv,"classid")) {
     92 			__u32 handle;
     93 
     94 			NEXT_ARG();
     95 			if (get_tc_classid(&handle,*argv)) {
     96 				fprintf(stderr, "Illegal \"classid\"\n");
     97 				return -1;
     98 			}
     99 			addattr_l(n, 4096, TCA_TCINDEX_CLASSID, &handle, 4);
    100 		}
    101 		else if (!strcmp(*argv,"police")) {
    102 			NEXT_ARG();
    103 			if (parse_police(&argc, &argv, TCA_TCINDEX_POLICE, n)) {
    104 				fprintf(stderr, "Illegal \"police\"\n");
    105 				return -1;
    106 			}
    107 			continue;
    108 		}
    109 		else {
    110 			explain();
    111 			return -1;
    112 		}
    113 		argc--;
    114 		argv++;
    115 	}
    116 	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
    117 	return 0;
    118 }
    119 
    120 
    121 static int tcindex_print_opt(struct filter_util *qu, FILE *f,
    122      struct rtattr *opt, __u32 handle)
    123 {
    124 	struct rtattr *tb[TCA_TCINDEX_MAX+1];
    125 
    126 	if (opt == NULL)
    127 		return 0;
    128 
    129 	parse_rtattr_nested(tb, TCA_TCINDEX_MAX, opt);
    130 
    131 	if (handle != ~0) fprintf(f,"handle 0x%04x ",handle);
    132 	if (tb[TCA_TCINDEX_HASH]) {
    133 		__u16 hash;
    134 
    135 		if (RTA_PAYLOAD(tb[TCA_TCINDEX_HASH]) < sizeof(hash))
    136 			return -1;
    137 		hash = rta_getattr_u16(tb[TCA_TCINDEX_HASH]);
    138 		fprintf(f,"hash %d ",hash);
    139 	}
    140 	if (tb[TCA_TCINDEX_MASK]) {
    141 		__u16 mask;
    142 
    143 		if (RTA_PAYLOAD(tb[TCA_TCINDEX_MASK]) < sizeof(mask))
    144 			return -1;
    145 		mask = rta_getattr_u16(tb[TCA_TCINDEX_MASK]);
    146 		fprintf(f,"mask 0x%04x ",mask);
    147 	}
    148 	if (tb[TCA_TCINDEX_SHIFT]) {
    149 		int shift;
    150 
    151 		if (RTA_PAYLOAD(tb[TCA_TCINDEX_SHIFT]) < sizeof(shift))
    152 			return -1;
    153 		shift = *(int *) RTA_DATA(tb[TCA_TCINDEX_SHIFT]);
    154 		fprintf(f,"shift %d ",shift);
    155 	}
    156 	if (tb[TCA_TCINDEX_FALL_THROUGH]) {
    157 		int fall_through;
    158 
    159 		if (RTA_PAYLOAD(tb[TCA_TCINDEX_FALL_THROUGH]) <
    160 		    sizeof(fall_through))
    161 			return -1;
    162 		fall_through = *(int *) RTA_DATA(tb[TCA_TCINDEX_FALL_THROUGH]);
    163 		fprintf(f,fall_through ? "fall_through " : "pass_on ");
    164 	}
    165 	if (tb[TCA_TCINDEX_CLASSID]) {
    166 		SPRINT_BUF(b1);
    167 		fprintf(f, "classid %s ",sprint_tc_classid(*(__u32 *)
    168 		    RTA_DATA(tb[TCA_TCINDEX_CLASSID]), b1));
    169 	}
    170 	if (tb[TCA_TCINDEX_POLICE]) {
    171 		fprintf(f, "\n");
    172 		tc_print_police(f, tb[TCA_TCINDEX_POLICE]);
    173 	}
    174 	return 0;
    175 }
    176 
    177 struct filter_util tcindex_filter_util = {
    178 	.id = "tcindex",
    179 	.parse_fopt = tcindex_parse_opt,
    180 	.print_fopt = tcindex_print_opt,
    181 };
    182