Home | History | Annotate | Download | only in tc
      1 /*
      2  * tc_filter.c		"tc 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_ether.h>
     23 
     24 #include "rt_names.h"
     25 #include "utils.h"
     26 #include "tc_util.h"
     27 #include "tc_common.h"
     28 
     29 static void usage(void);
     30 
     31 static void usage(void)
     32 {
     33 	fprintf(stderr, "Usage: tc filter [ add | del | change | replace | show ] dev STRING\n");
     34 	fprintf(stderr, "       [ pref PRIO ] protocol PROTO\n");
     35 	fprintf(stderr, "       [ estimator INTERVAL TIME_CONSTANT ]\n");
     36 	fprintf(stderr, "       [ root | classid CLASSID ] [ handle FILTERID ]\n");
     37 	fprintf(stderr, "       [ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n");
     38 	fprintf(stderr, "\n");
     39 	fprintf(stderr, "       tc filter show [ dev STRING ] [ root | parent CLASSID ]\n");
     40 	fprintf(stderr, "Where:\n");
     41 	fprintf(stderr, "FILTER_TYPE := { rsvp | u32 | fw | route | etc. }\n");
     42 	fprintf(stderr, "FILTERID := ... format depends on classifier, see there\n");
     43 	fprintf(stderr, "OPTIONS := ... try tc filter add <desired FILTER_KIND> help\n");
     44 	return;
     45 }
     46 
     47 
     48 int tc_filter_modify(int cmd, unsigned flags, int argc, char **argv)
     49 {
     50 	struct {
     51 		struct nlmsghdr 	n;
     52 		struct tcmsg 		t;
     53 		char   			buf[MAX_MSG];
     54 	} req;
     55 	struct filter_util *q = NULL;
     56 	__u32 prio = 0;
     57 	__u32 protocol = 0;
     58 	int protocol_set = 0;
     59 	char *fhandle = NULL;
     60 	char  d[16];
     61 	char  k[16];
     62 	struct tc_estimator est;
     63 
     64 	memset(&req, 0, sizeof(req));
     65 	memset(&est, 0, sizeof(est));
     66 	memset(d, 0, sizeof(d));
     67 	memset(k, 0, sizeof(k));
     68 	memset(&req, 0, sizeof(req));
     69 
     70 	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
     71 	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
     72 	req.n.nlmsg_type = cmd;
     73 	req.t.tcm_family = AF_UNSPEC;
     74 
     75 	if (cmd == RTM_NEWTFILTER && flags & NLM_F_CREATE)
     76 		protocol = htons(ETH_P_ALL);
     77 
     78 	while (argc > 0) {
     79 		if (strcmp(*argv, "dev") == 0) {
     80 			NEXT_ARG();
     81 			if (d[0])
     82 				duparg("dev", *argv);
     83 			strncpy(d, *argv, sizeof(d)-1);
     84 		} else if (strcmp(*argv, "root") == 0) {
     85 			if (req.t.tcm_parent) {
     86 				fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
     87 				return -1;
     88 			}
     89 			req.t.tcm_parent = TC_H_ROOT;
     90 		} else if (strcmp(*argv, "parent") == 0) {
     91 			__u32 handle;
     92 			NEXT_ARG();
     93 			if (req.t.tcm_parent)
     94 				duparg("parent", *argv);
     95 			if (get_tc_classid(&handle, *argv))
     96 				invarg(*argv, "Invalid parent ID");
     97 			req.t.tcm_parent = handle;
     98 		} else if (strcmp(*argv, "handle") == 0) {
     99 			NEXT_ARG();
    100 			if (fhandle)
    101 				duparg("handle", *argv);
    102 			fhandle = *argv;
    103 		} else if (matches(*argv, "preference") == 0 ||
    104 			   matches(*argv, "priority") == 0) {
    105 			NEXT_ARG();
    106 			if (prio)
    107 				duparg("priority", *argv);
    108 			if (get_u32(&prio, *argv, 0))
    109 				invarg(*argv, "invalid priority value");
    110 		} else if (matches(*argv, "protocol") == 0) {
    111 			__u16 id;
    112 			NEXT_ARG();
    113 			if (protocol_set)
    114 				duparg("protocol", *argv);
    115 			if (ll_proto_a2n(&id, *argv))
    116 				invarg(*argv, "invalid protocol");
    117 			protocol = id;
    118 			protocol_set = 1;
    119 		} else if (matches(*argv, "estimator") == 0) {
    120 			if (parse_estimator(&argc, &argv, &est) < 0)
    121 				return -1;
    122 		} else if (matches(*argv, "help") == 0) {
    123 			usage();
    124 			return 0;
    125 		} else {
    126 			strncpy(k, *argv, sizeof(k)-1);
    127 
    128 			q = get_filter_kind(k);
    129 			argc--; argv++;
    130 			break;
    131 		}
    132 
    133 		argc--; argv++;
    134 	}
    135 
    136 	req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
    137 
    138 	if (k[0])
    139 		addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
    140 
    141 	if (q) {
    142 		if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
    143 			return 1;
    144 	} else {
    145 		if (fhandle) {
    146 			fprintf(stderr, "Must specify filter type when using "
    147 				"\"handle\"\n");
    148 			return -1;
    149 		}
    150 		if (argc) {
    151 			if (matches(*argv, "help") == 0)
    152 				usage();
    153 			fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc filter help\".\n", *argv);
    154 			return -1;
    155 		}
    156 	}
    157 	if (est.ewma_log)
    158 		addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
    159 
    160 
    161 	if (d[0])  {
    162  		ll_init_map(&rth);
    163 
    164 		if ((req.t.tcm_ifindex = ll_name_to_index(d)) == 0) {
    165 			fprintf(stderr, "Cannot find device \"%s\"\n", d);
    166 			return 1;
    167 		}
    168 	}
    169 
    170 	if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0) {
    171 		fprintf(stderr, "We have an error talking to the kernel\n");
    172 		return 2;
    173 	}
    174 
    175 	return 0;
    176 }
    177 
    178 static __u32 filter_parent;
    179 static int filter_ifindex;
    180 static __u32 filter_prio;
    181 static __u32 filter_protocol;
    182 __u16 f_proto = 0;
    183 
    184 int print_filter(const struct sockaddr_nl *who,
    185 			struct nlmsghdr *n,
    186 			void *arg)
    187 {
    188 	FILE *fp = (FILE*)arg;
    189 	struct tcmsg *t = NLMSG_DATA(n);
    190 	int len = n->nlmsg_len;
    191 	struct rtattr * tb[TCA_MAX+1];
    192 	struct filter_util *q;
    193 	char abuf[256];
    194 
    195 	if (n->nlmsg_type != RTM_NEWTFILTER && n->nlmsg_type != RTM_DELTFILTER) {
    196 		fprintf(stderr, "Not a filter\n");
    197 		return 0;
    198 	}
    199 	len -= NLMSG_LENGTH(sizeof(*t));
    200 	if (len < 0) {
    201 		fprintf(stderr, "Wrong len %d\n", len);
    202 		return -1;
    203 	}
    204 
    205 	memset(tb, 0, sizeof(tb));
    206 	parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
    207 
    208 	if (tb[TCA_KIND] == NULL) {
    209 		fprintf(stderr, "print_filter: NULL kind\n");
    210 		return -1;
    211 	}
    212 
    213 	if (n->nlmsg_type == RTM_DELTFILTER)
    214 		fprintf(fp, "deleted ");
    215 
    216 	fprintf(fp, "filter ");
    217 	if (!filter_ifindex || filter_ifindex != t->tcm_ifindex)
    218 		fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
    219 
    220 	if (!filter_parent || filter_parent != t->tcm_parent) {
    221 		if (t->tcm_parent == TC_H_ROOT)
    222 			fprintf(fp, "root ");
    223 		else {
    224 			print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
    225 			fprintf(fp, "parent %s ", abuf);
    226 		}
    227 	}
    228 	if (t->tcm_info) {
    229 		f_proto = TC_H_MIN(t->tcm_info);
    230 		__u32 prio = TC_H_MAJ(t->tcm_info)>>16;
    231 		if (!filter_protocol || filter_protocol != f_proto) {
    232 			if (f_proto) {
    233 				SPRINT_BUF(b1);
    234 				fprintf(fp, "protocol %s ",
    235 					ll_proto_n2a(f_proto, b1, sizeof(b1)));
    236 			}
    237 		}
    238 		if (!filter_prio || filter_prio != prio) {
    239 			if (prio)
    240 				fprintf(fp, "pref %u ", prio);
    241 		}
    242 	}
    243 	fprintf(fp, "%s ", rta_getattr_str(tb[TCA_KIND]));
    244 	q = get_filter_kind(RTA_DATA(tb[TCA_KIND]));
    245 	if (tb[TCA_OPTIONS]) {
    246 		if (q)
    247 			q->print_fopt(q, fp, tb[TCA_OPTIONS], t->tcm_handle);
    248 		else
    249 			fprintf(fp, "[cannot parse parameters]");
    250 	}
    251 	fprintf(fp, "\n");
    252 
    253 	if (show_stats && (tb[TCA_STATS] || tb[TCA_STATS2])) {
    254 		print_tcstats_attr(fp, tb, " ", NULL);
    255 		fprintf(fp, "\n");
    256 	}
    257 
    258 	fflush(fp);
    259 	return 0;
    260 }
    261 
    262 
    263 int tc_filter_list(int argc, char **argv)
    264 {
    265 	struct tcmsg t;
    266 	char d[16];
    267 	__u32 prio = 0;
    268 	__u32 protocol = 0;
    269 	char *fhandle = NULL;
    270 
    271 	memset(&t, 0, sizeof(t));
    272 	t.tcm_family = AF_UNSPEC;
    273 	memset(d, 0, sizeof(d));
    274 
    275 	while (argc > 0) {
    276 		if (strcmp(*argv, "dev") == 0) {
    277 			NEXT_ARG();
    278 			if (d[0])
    279 				duparg("dev", *argv);
    280 			strncpy(d, *argv, sizeof(d)-1);
    281 		} else if (strcmp(*argv, "root") == 0) {
    282 			if (t.tcm_parent) {
    283 				fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
    284 				return -1;
    285 			}
    286 			filter_parent = t.tcm_parent = TC_H_ROOT;
    287 		} else if (strcmp(*argv, "parent") == 0) {
    288 			__u32 handle;
    289 			NEXT_ARG();
    290 			if (t.tcm_parent)
    291 				duparg("parent", *argv);
    292 			if (get_tc_classid(&handle, *argv))
    293 				invarg(*argv, "invalid parent ID");
    294 			filter_parent = t.tcm_parent = handle;
    295 		} else if (strcmp(*argv, "handle") == 0) {
    296 			NEXT_ARG();
    297 			if (fhandle)
    298 				duparg("handle", *argv);
    299 			fhandle = *argv;
    300 		} else if (matches(*argv, "preference") == 0 ||
    301 			   matches(*argv, "priority") == 0) {
    302 			NEXT_ARG();
    303 			if (prio)
    304 				duparg("priority", *argv);
    305 			if (get_u32(&prio, *argv, 0))
    306 				invarg(*argv, "invalid preference");
    307 			filter_prio = prio;
    308 		} else if (matches(*argv, "protocol") == 0) {
    309 			__u16 res;
    310 			NEXT_ARG();
    311 			if (protocol)
    312 				duparg("protocol", *argv);
    313 			if (ll_proto_a2n(&res, *argv))
    314 				invarg(*argv, "invalid protocol");
    315 			protocol = res;
    316 			filter_protocol = protocol;
    317 		} else if (matches(*argv, "help") == 0) {
    318 			usage();
    319 		} else {
    320 			fprintf(stderr, " What is \"%s\"? Try \"tc filter help\"\n", *argv);
    321 			return -1;
    322 		}
    323 
    324 		argc--; argv++;
    325 	}
    326 
    327 	t.tcm_info = TC_H_MAKE(prio<<16, protocol);
    328 
    329  	ll_init_map(&rth);
    330 
    331 	if (d[0]) {
    332 		if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
    333 			fprintf(stderr, "Cannot find device \"%s\"\n", d);
    334 			return 1;
    335 		}
    336 		filter_ifindex = t.tcm_ifindex;
    337 	}
    338 
    339  	if (rtnl_dump_request(&rth, RTM_GETTFILTER, &t, sizeof(t)) < 0) {
    340 		perror("Cannot send dump request");
    341 		return 1;
    342 	}
    343 
    344  	if (rtnl_dump_filter(&rth, print_filter, stdout) < 0) {
    345 		fprintf(stderr, "Dump terminated\n");
    346 		return 1;
    347 	}
    348 
    349 	return 0;
    350 }
    351 
    352 int do_filter(int argc, char **argv)
    353 {
    354 	if (argc < 1)
    355 		return tc_filter_list(0, NULL);
    356 	if (matches(*argv, "add") == 0)
    357 		return tc_filter_modify(RTM_NEWTFILTER, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
    358 	if (matches(*argv, "change") == 0)
    359 		return tc_filter_modify(RTM_NEWTFILTER, 0, argc-1, argv+1);
    360 	if (matches(*argv, "replace") == 0)
    361 		return tc_filter_modify(RTM_NEWTFILTER, NLM_F_CREATE, argc-1, argv+1);
    362 	if (matches(*argv, "delete") == 0)
    363 		return tc_filter_modify(RTM_DELTFILTER, 0,  argc-1, argv+1);
    364 #if 0
    365 	if (matches(*argv, "get") == 0)
    366 		return tc_filter_get(RTM_GETTFILTER, 0,  argc-1, argv+1);
    367 #endif
    368 	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
    369 	    || matches(*argv, "lst") == 0)
    370 		return tc_filter_list(argc-1, argv+1);
    371 	if (matches(*argv, "help") == 0) {
    372 		usage();
    373 		return 0;
    374         }
    375 	fprintf(stderr, "Command \"%s\" is unknown, try \"tc filter help\".\n", *argv);
    376 	return -1;
    377 }
    378 
    379