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      1 /*
      2  * f_matchall.c		Match-all 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:	Jiri Pirko <jiri (at) mellanox.com>, Yotam Gigi <yotamg (at) mellanox.com>
     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 
     27 static void explain(void)
     28 {
     29 	fprintf(stderr, "Usage: ... matchall [skip_sw | skip_hw]\n");
     30 	fprintf(stderr, "                 [ action ACTION_SPEC ] [ classid CLASSID ]\n");
     31 	fprintf(stderr, "\n");
     32 	fprintf(stderr, "Where: SELECTOR := SAMPLE SAMPLE ...\n");
     33 	fprintf(stderr, "       FILTERID := X:Y:Z\n");
     34 	fprintf(stderr, "       ACTION_SPEC := ... look at individual actions\n");
     35 	fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
     36 }
     37 
     38 static int matchall_parse_opt(struct filter_util *qu, char *handle,
     39 			   int argc, char **argv, struct nlmsghdr *n)
     40 {
     41 	struct tcmsg *t = NLMSG_DATA(n);
     42 	struct rtattr *tail;
     43 	__u32 flags = 0;
     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, "classid") == 0 ||
     64 			   strcmp(*argv, "flowid") == 0) {
     65 			unsigned int handle;
     66 
     67 			NEXT_ARG();
     68 			if (get_tc_classid(&handle, *argv)) {
     69 				fprintf(stderr, "Illegal \"classid\"\n");
     70 				return -1;
     71 			}
     72 			addattr_l(n, MAX_MSG, TCA_MATCHALL_CLASSID, &handle, 4);
     73 		} else if (matches(*argv, "action") == 0) {
     74 			NEXT_ARG();
     75 			if (parse_action(&argc, &argv, TCA_MATCHALL_ACT, n)) {
     76 				fprintf(stderr, "Illegal \"action\"\n");
     77 				return -1;
     78 			}
     79 			continue;
     80 
     81 		} else if (strcmp(*argv, "skip_hw") == 0) {
     82 			NEXT_ARG();
     83 			flags |= TCA_CLS_FLAGS_SKIP_HW;
     84 			continue;
     85 		} else if (strcmp(*argv, "skip_sw") == 0) {
     86 			NEXT_ARG();
     87 			flags |= TCA_CLS_FLAGS_SKIP_SW;
     88 			continue;
     89 		} else if (strcmp(*argv, "help") == 0) {
     90 			explain();
     91 			return -1;
     92 		} else {
     93 			fprintf(stderr, "What is \"%s\"?\n", *argv);
     94 			explain();
     95 			return -1;
     96 		}
     97 		argc--; argv++;
     98 	}
     99 
    100 	if (flags) {
    101 		if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW |
    102 			       TCA_CLS_FLAGS_SKIP_SW))) {
    103 			fprintf(stderr,
    104 				"skip_hw and skip_sw are mutually exclusive\n");
    105 			return -1;
    106 		}
    107 		addattr_l(n, MAX_MSG, TCA_MATCHALL_FLAGS, &flags, 4);
    108 	}
    109 
    110 	tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail;
    111 	return 0;
    112 }
    113 
    114 static int matchall_print_opt(struct filter_util *qu, FILE *f,
    115 			   struct rtattr *opt, __u32 handle)
    116 {
    117 	struct rtattr *tb[TCA_MATCHALL_MAX+1];
    118 
    119 	if (opt == NULL)
    120 		return 0;
    121 
    122 	parse_rtattr_nested(tb, TCA_MATCHALL_MAX, opt);
    123 
    124 	if (handle)
    125 		fprintf(f, "handle 0x%x ", handle);
    126 
    127 	if (tb[TCA_MATCHALL_CLASSID]) {
    128 		SPRINT_BUF(b1);
    129 		fprintf(f, "flowid %s ",
    130 			sprint_tc_classid(rta_getattr_u32(tb[TCA_MATCHALL_CLASSID]), b1));
    131 	}
    132 
    133 	if (tb[TCA_MATCHALL_FLAGS]) {
    134 		__u32 flags = rta_getattr_u32(tb[TCA_MATCHALL_FLAGS]);
    135 
    136 		if (flags & TCA_CLS_FLAGS_SKIP_HW)
    137 			fprintf(f, "\n  skip_hw");
    138 		if (flags & TCA_CLS_FLAGS_SKIP_SW)
    139 			fprintf(f, "\n  skip_sw");
    140 
    141 		if (flags & TCA_CLS_FLAGS_IN_HW)
    142 			fprintf(f, "\n  in_hw");
    143 		else if (flags & TCA_CLS_FLAGS_NOT_IN_HW)
    144 			fprintf(f, "\n  not_in_hw");
    145 	}
    146 
    147 	if (tb[TCA_MATCHALL_ACT])
    148 		tc_print_action(f, tb[TCA_MATCHALL_ACT], 0);
    149 
    150 	return 0;
    151 }
    152 
    153 struct filter_util matchall_filter_util = {
    154 	.id = "matchall",
    155 	.parse_fopt = matchall_parse_opt,
    156 	.print_fopt = matchall_print_opt,
    157 };
    158