tc/f_matchall.c

   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@mellanox.com>, Yotam Gigi <yotamg@mellanox.com>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21 #include <linux/if.h>
  22
  23 #include "utils.h"
  24 #include "tc_util.h"
  25
  26 static void explain(void)
  27 {
  28         fprintf(stderr,
  29                 "Usage: ... matchall [skip_sw | skip_hw]\n"
  30                 "                 [ action ACTION_SPEC ] [ classid CLASSID ]\n"
  31                 "\n"
  32                 "Where: SELECTOR := SAMPLE SAMPLE ...\n"
  33                 "       FILTERID := X:Y:Z\n"
  34                 "       ACTION_SPEC := ... look at individual actions\n"
  35                 "\n"
  36                 "NOTE: CLASSID is parsed as hexadecimal input.\n");
  37 }
  38
  39 static int matchall_parse_opt(struct filter_util *qu, char *handle,
  40                            int argc, char **argv, struct nlmsghdr *n)
  41 {
  42         struct tcmsg *t = NLMSG_DATA(n);
  43         struct rtattr *tail;
  44         __u32 flags = 0;
  45         long h = 0;
  46
  47         if (handle) {
  48                 h = strtol(handle, NULL, 0);
  49                 if (h == LONG_MIN || h == LONG_MAX) {
  50                         fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
  51                             handle);
  52                         return -1;
  53                 }
  54         }
  55         t->tcm_handle = h;
  56
  57         if (argc == 0)
  58                 return 0;
  59
  60         tail = (struct rtattr *)(((void *)n)+NLMSG_ALIGN(n->nlmsg_len));
  61         addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
  62
  63         while (argc > 0) {
  64                 if (matches(*argv, "classid") == 0 ||
  65                            strcmp(*argv, "flowid") == 0) {
  66                         unsigned int handle;
  67
  68                         NEXT_ARG();
  69                         if (get_tc_classid(&handle, *argv)) {
  70                                 fprintf(stderr, "Illegal \"classid\"\n");
  71                                 return -1;
  72                         }
  73                         addattr_l(n, MAX_MSG, TCA_MATCHALL_CLASSID, &handle, 4);
  74                 } else if (matches(*argv, "action") == 0) {
  75                         NEXT_ARG();
  76                         if (parse_action(&argc, &argv, TCA_MATCHALL_ACT, n)) {
  77                                 fprintf(stderr, "Illegal \"action\"\n");
  78                                 return -1;
  79                         }
  80                         continue;
  81
  82                 } else if (strcmp(*argv, "skip_hw") == 0) {
  83                         NEXT_ARG();
  84                         flags |= TCA_CLS_FLAGS_SKIP_HW;
  85                         continue;
  86                 } else if (strcmp(*argv, "skip_sw") == 0) {
  87                         NEXT_ARG();
  88                         flags |= TCA_CLS_FLAGS_SKIP_SW;
  89                         continue;
  90                 } else if (strcmp(*argv, "help") == 0) {
  91                         explain();
  92                         return -1;
  93                 } else {
  94                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  95                         explain();
  96                         return -1;
  97                 }
  98                 argc--; argv++;
  99         }
 100
 101         if (flags) {
 102                 if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW |
 103                                TCA_CLS_FLAGS_SKIP_SW))) {
 104                         fprintf(stderr,
 105                                 "skip_hw and skip_sw are mutually exclusive\n");
 106                         return -1;
 107                 }
 108                 addattr_l(n, MAX_MSG, TCA_MATCHALL_FLAGS, &flags, 4);
 109         }
 110
 111         tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail;
 112         return 0;
 113 }
 114
 115 static int matchall_print_opt(struct filter_util *qu, FILE *f,
 116                            struct rtattr *opt, __u32 handle)
 117 {
 118         struct rtattr *tb[TCA_MATCHALL_MAX+1];
 119         struct tc_matchall_pcnt *pf = NULL;
 120
 121         if (opt == NULL)
 122                 return 0;
 123
 124         parse_rtattr_nested(tb, TCA_MATCHALL_MAX, opt);
 125
 126         if (handle)
 127                 print_uint(PRINT_ANY, "handle", "handle 0x%x ", handle);
 128
 129         if (tb[TCA_MATCHALL_CLASSID]) {
 130                 SPRINT_BUF(b1);
 131                 print_string(PRINT_ANY, "flowid", "flowid %s ",
 132                         sprint_tc_classid(rta_getattr_u32(tb[TCA_MATCHALL_CLASSID]), b1));
 133         }
 134
 135         if (tb[TCA_MATCHALL_FLAGS]) {
 136                 __u32 flags = rta_getattr_u32(tb[TCA_MATCHALL_FLAGS]);
 137
 138                 if (flags & TCA_CLS_FLAGS_SKIP_HW)
 139                         print_bool(PRINT_ANY, "skip_hw", "\n  skip_hw", true);
 140                 if (flags & TCA_CLS_FLAGS_SKIP_SW)
 141                         print_bool(PRINT_ANY, "skip_sw", "\n  skip_sw", true);
 142
 143                 if (flags & TCA_CLS_FLAGS_IN_HW)
 144                         print_bool(PRINT_ANY, "in_hw", "\n  in_hw", true);
 145                 else if (flags & TCA_CLS_FLAGS_NOT_IN_HW)
 146                         print_bool(PRINT_ANY, "not_in_hw", "\n  not_in_hw", true);
 147         }
 148
 149         if (tb[TCA_MATCHALL_PCNT]) {
 150                 if (RTA_PAYLOAD(tb[TCA_MATCHALL_PCNT])  < sizeof(*pf)) {
 151                         print_string(PRINT_FP, NULL, "Broken perf counters\n", NULL);
 152                         return -1;
 153                 }
 154                 pf = RTA_DATA(tb[TCA_MATCHALL_PCNT]);
 155         }
 156
 157         if (show_stats && NULL != pf)
 158                 print_u64(PRINT_ANY, "rule_hit", " (rule hit %llu)",
 159                         (unsigned long long) pf->rhit);
 160
 161
 162         if (tb[TCA_MATCHALL_ACT])
 163                 tc_print_action(f, tb[TCA_MATCHALL_ACT], 0);
 164
 165         return 0;
 166 }
 167
 168 struct filter_util matchall_filter_util = {
 169         .id = "matchall",
 170         .parse_fopt = matchall_parse_opt,
 171         .print_fopt = matchall_print_opt,
 172 };