tc/m_ife.c

   1 /*
   2  * m_ife.c      IFE actions module
   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:  J Hadi Salim (jhs@mojatatu.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/netdevice.h>
  22
  23 #include "rt_names.h"
  24 #include "utils.h"
  25 #include "tc_util.h"
  26 #include <linux/tc_act/tc_ife.h>
  27
  28 static void ife_explain(void)
  29 {
  30         fprintf(stderr,
  31                 "Usage:... ife {decode|encode} [{ALLOW|USE} ATTR] [dst DMAC] [src SMAC] [type TYPE] [CONTROL] [index INDEX]\n");
  32         fprintf(stderr,
  33                 "\tALLOW := Encode direction. Allows encoding specified metadata\n"
  34                 "\t\t e.g \"allow mark\"\n"
  35                 "\tUSE := Encode direction. Enforce Static encoding of specified metadata\n"
  36                 "\t\t e.g \"use mark 0x12\"\n"
  37                 "\tATTR := mark (32-bit), prio (32-bit), tcindex (16-bit)\n"
  38                 "\tDMAC := 6 byte Destination MAC address to encode\n"
  39                 "\tSMAC := optional 6 byte Source MAC address to encode\n"
  40                 "\tTYPE := optional 16 bit ethertype to encode\n"
  41                 "\tCONTROL := reclassify|pipe|drop|continue|ok\n"
  42                 "\tINDEX := optional IFE table index value used\n");
  43         fprintf(stderr, "encode is used for sending IFE packets\n");
  44         fprintf(stderr, "decode is used for receiving IFE packets\n");
  45 }
  46
  47 static void ife_usage(void)
  48 {
  49         ife_explain();
  50         exit(-1);
  51 }
  52
  53 static int parse_ife(struct action_util *a, int *argc_p, char ***argv_p,
  54                      int tca_id, struct nlmsghdr *n)
  55 {
  56         int argc = *argc_p;
  57         char **argv = *argv_p;
  58         int ok = 0;
  59         struct tc_ife p = { 0 };
  60         struct rtattr *tail;
  61         struct rtattr *tail2;
  62         char dbuf[ETH_ALEN];
  63         char sbuf[ETH_ALEN];
  64         __u16 ife_type = 0;
  65         int user_type = 0;
  66         __u32 ife_prio = 0;
  67         __u32 ife_prio_v = 0;
  68         __u32 ife_mark = 0;
  69         __u32 ife_mark_v = 0;
  70         __u16 ife_tcindex = 0;
  71         __u16 ife_tcindex_v = 0;
  72         char *daddr = NULL;
  73         char *saddr = NULL;
  74
  75         if (argc <= 0)
  76                 return -1;
  77
  78         while (argc > 0) {
  79                 if (matches(*argv, "ife") == 0) {
  80                         NEXT_ARG();
  81                         continue;
  82                 } else if (matches(*argv, "decode") == 0) {
  83                         p.flags = IFE_DECODE; /* readability aid */
  84                         ok++;
  85                 } else if (matches(*argv, "encode") == 0) {
  86                         p.flags = IFE_ENCODE;
  87                         ok++;
  88                 } else if (matches(*argv, "allow") == 0) {
  89                         NEXT_ARG();
  90                         if (matches(*argv, "mark") == 0) {
  91                                 ife_mark = IFE_META_SKBMARK;
  92                         } else if (matches(*argv, "prio") == 0) {
  93                                 ife_prio = IFE_META_PRIO;
  94                         } else if (matches(*argv, "tcindex") == 0) {
  95                                 ife_tcindex = IFE_META_TCINDEX;
  96                         } else {
  97                                 fprintf(stderr, "Illegal meta define <%s>\n",
  98                                         *argv);
  99                                 return -1;
 100                         }
 101                 } else if (matches(*argv, "use") == 0) {
 102                         NEXT_ARG();
 103                         if (matches(*argv, "mark") == 0) {
 104                                 NEXT_ARG();
 105                                 if (get_u32(&ife_mark_v, *argv, 0))
 106                                         invarg("ife mark val is invalid",
 107                                                *argv);
 108                         } else if (matches(*argv, "prio") == 0) {
 109                                 NEXT_ARG();
 110                                 if (get_u32(&ife_prio_v, *argv, 0))
 111                                         invarg("ife prio val is invalid",
 112                                                *argv);
 113                         } else if (matches(*argv, "tcindex") == 0) {
 114                                 NEXT_ARG();
 115                                 if (get_u16(&ife_tcindex_v, *argv, 0))
 116                                         invarg("ife tcindex val is invalid",
 117                                                *argv);
 118                         } else {
 119                                 fprintf(stderr, "Illegal meta use type <%s>\n",
 120                                         *argv);
 121                                 return -1;
 122                         }
 123                 } else if (matches(*argv, "type") == 0) {
 124                         NEXT_ARG();
 125                         if (get_u16(&ife_type, *argv, 0))
 126                                 invarg("ife type is invalid", *argv);
 127                         fprintf(stderr, "IFE type 0x%04X\n", ife_type);
 128                         user_type = 1;
 129                 } else if (matches(*argv, "dst") == 0) {
 130                         NEXT_ARG();
 131                         daddr = *argv;
 132                         if (sscanf(daddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 133                                    dbuf, dbuf + 1, dbuf + 2,
 134                                    dbuf + 3, dbuf + 4, dbuf + 5) != 6) {
 135                                 fprintf(stderr, "Invalid mac address %s\n",
 136                                         daddr);
 137                         }
 138                         fprintf(stderr, "dst MAC address <%s>\n", daddr);
 139
 140                 } else if (matches(*argv, "src") == 0) {
 141                         NEXT_ARG();
 142                         saddr = *argv;
 143                         if (sscanf(saddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 144                                    sbuf, sbuf + 1, sbuf + 2,
 145                                    sbuf + 3, sbuf + 4, sbuf + 5) != 6) {
 146                                 fprintf(stderr, "Invalid mac address %s\n",
 147                                         saddr);
 148                         }
 149                         fprintf(stderr, "src MAC address <%s>\n", saddr);
 150                 } else if (matches(*argv, "help") == 0) {
 151                         ife_usage();
 152                 } else {
 153                         break;
 154                 }
 155
 156                 argc--;
 157                 argv++;
 158         }
 159
 160         parse_action_control_dflt(&argc, &argv, &p.action, false, TC_ACT_PIPE);
 161
 162         NEXT_ARG_FWD();
 163         if (argc) {
 164                 if (matches(*argv, "index") == 0) {
 165                         NEXT_ARG();
 166                         if (get_u32(&p.index, *argv, 0)) {
 167                                 fprintf(stderr, "ife: Illegal \"index\"\n");
 168                                 return -1;
 169                         }
 170                         ok++;
 171                         argc--;
 172                         argv++;
 173                 }
 174         }
 175
 176         if (!ok) {
 177                 fprintf(stderr, "IFE requires decode/encode specified\n");
 178                 ife_usage();
 179         }
 180
 181         tail = NLMSG_TAIL(n);
 182         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 183         addattr_l(n, MAX_MSG, TCA_IFE_PARMS, &p, sizeof(p));
 184
 185         if (!(p.flags & IFE_ENCODE))
 186                 goto skip_encode;
 187
 188         if (daddr)
 189                 addattr_l(n, MAX_MSG, TCA_IFE_DMAC, dbuf, ETH_ALEN);
 190         if (user_type)
 191                 addattr_l(n, MAX_MSG, TCA_IFE_TYPE, &ife_type, 2);
 192         else
 193                 fprintf(stderr, "IFE type 0x%04X\n", ETH_P_IFE);
 194         if (saddr)
 195                 addattr_l(n, MAX_MSG, TCA_IFE_SMAC, sbuf, ETH_ALEN);
 196
 197         tail2 = NLMSG_TAIL(n);
 198         addattr_l(n, MAX_MSG, TCA_IFE_METALST, NULL, 0);
 199         if (ife_mark || ife_mark_v) {
 200                 if (ife_mark_v)
 201                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, &ife_mark_v, 4);
 202                 else
 203                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, NULL, 0);
 204         }
 205         if (ife_prio || ife_prio_v) {
 206                 if (ife_prio_v)
 207                         addattr_l(n, MAX_MSG, IFE_META_PRIO, &ife_prio_v, 4);
 208                 else
 209                         addattr_l(n, MAX_MSG, IFE_META_PRIO, NULL, 0);
 210         }
 211         if (ife_tcindex || ife_tcindex_v) {
 212                 if (ife_tcindex_v)
 213                         addattr_l(n, MAX_MSG, IFE_META_TCINDEX, &ife_tcindex_v,
 214                                   2);
 215                 else
 216                         addattr_l(n, MAX_MSG, IFE_META_TCINDEX, NULL, 0);
 217         }
 218
 219         tail2->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail2;
 220
 221 skip_encode:
 222         tail->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail;
 223
 224         *argc_p = argc;
 225         *argv_p = argv;
 226         return 0;
 227 }
 228
 229 static int print_ife(struct action_util *au, FILE *f, struct rtattr *arg)
 230 {
 231         struct tc_ife *p = NULL;
 232         struct rtattr *tb[TCA_IFE_MAX + 1];
 233         __u16 ife_type = 0;
 234         __u32 mmark = 0;
 235         __u16 mtcindex = 0;
 236         __u32 mprio = 0;
 237         int has_optional = 0;
 238         SPRINT_BUF(b2);
 239
 240         if (arg == NULL)
 241                 return -1;
 242
 243         parse_rtattr_nested(tb, TCA_IFE_MAX, arg);
 244
 245         if (tb[TCA_IFE_PARMS] == NULL) {
 246                 fprintf(f, "[NULL ife parameters]");
 247                 return -1;
 248         }
 249         p = RTA_DATA(tb[TCA_IFE_PARMS]);
 250
 251         fprintf(f, "ife %s ", p->flags & IFE_ENCODE ? "encode" : "decode");
 252         print_action_control(f, "action ", p->action, " ");
 253
 254         if (tb[TCA_IFE_TYPE]) {
 255                 ife_type = rta_getattr_u16(tb[TCA_IFE_TYPE]);
 256                 has_optional = 1;
 257                 fprintf(f, "type 0x%X ", ife_type);
 258         }
 259
 260         if (has_optional)
 261                 fprintf(f, "\n\t ");
 262
 263         if (tb[TCA_IFE_METALST]) {
 264                 struct rtattr *metalist[IFE_META_MAX + 1];
 265                 int len = 0;
 266
 267                 parse_rtattr_nested(metalist, IFE_META_MAX,
 268                                     tb[TCA_IFE_METALST]);
 269
 270                 if (metalist[IFE_META_SKBMARK]) {
 271                         len = RTA_PAYLOAD(metalist[IFE_META_SKBMARK]);
 272                         if (len) {
 273                                 mmark = rta_getattr_u32(metalist[IFE_META_SKBMARK]);
 274                                 fprintf(f, "use mark %u ", mmark);
 275                         } else
 276                                 fprintf(f, "allow mark ");
 277                 }
 278
 279                 if (metalist[IFE_META_TCINDEX]) {
 280                         len = RTA_PAYLOAD(metalist[IFE_META_TCINDEX]);
 281                         if (len) {
 282                                 mtcindex =
 283                                         rta_getattr_u16(metalist[IFE_META_TCINDEX]);
 284                                 fprintf(f, "use tcindex %d ", mtcindex);
 285                         } else
 286                                 fprintf(f, "allow tcindex ");
 287                 }
 288
 289                 if (metalist[IFE_META_PRIO]) {
 290                         len = RTA_PAYLOAD(metalist[IFE_META_PRIO]);
 291                         if (len) {
 292                                 mprio = rta_getattr_u32(metalist[IFE_META_PRIO]);
 293                                 fprintf(f, "use prio %u ", mprio);
 294                         } else
 295                                 fprintf(f, "allow prio ");
 296                 }
 297
 298         }
 299
 300         if (tb[TCA_IFE_DMAC]) {
 301                 has_optional = 1;
 302                 fprintf(f, "dst %s ",
 303                         ll_addr_n2a(RTA_DATA(tb[TCA_IFE_DMAC]),
 304                                     RTA_PAYLOAD(tb[TCA_IFE_DMAC]), 0, b2,
 305                                     sizeof(b2)));
 306
 307         }
 308
 309         if (tb[TCA_IFE_SMAC]) {
 310                 has_optional = 1;
 311                 fprintf(f, "src %s ",
 312                         ll_addr_n2a(RTA_DATA(tb[TCA_IFE_SMAC]),
 313                                     RTA_PAYLOAD(tb[TCA_IFE_SMAC]), 0, b2,
 314                                     sizeof(b2)));
 315         }
 316
 317         fprintf(f, "\n\t index %u ref %d bind %d", p->index, p->refcnt,
 318                 p->bindcnt);
 319         if (show_stats) {
 320                 if (tb[TCA_IFE_TM]) {
 321                         struct tcf_t *tm = RTA_DATA(tb[TCA_IFE_TM]);
 322
 323                         print_tm(f, tm);
 324                 }
 325         }
 326
 327         fprintf(f, "\n");
 328
 329         return 0;
 330 }
 331
 332 struct action_util ife_action_util = {
 333         .id = "ife",
 334         .parse_aopt = parse_ife,
 335         .print_aopt = print_ife,
 336 };