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                                 invarg("Illegal meta define", *argv);
  98                         }
  99                 } else if (matches(*argv, "use") == 0) {
 100                         NEXT_ARG();
 101                         if (matches(*argv, "mark") == 0) {
 102                                 NEXT_ARG();
 103                                 if (get_u32(&ife_mark_v, *argv, 0))
 104                                         invarg("ife mark val is invalid",
 105                                                *argv);
 106                         } else if (matches(*argv, "prio") == 0) {
 107                                 NEXT_ARG();
 108                                 if (get_u32(&ife_prio_v, *argv, 0))
 109                                         invarg("ife prio val is invalid",
 110                                                *argv);
 111                         } else if (matches(*argv, "tcindex") == 0) {
 112                                 NEXT_ARG();
 113                                 if (get_u16(&ife_tcindex_v, *argv, 0))
 114                                         invarg("ife tcindex val is invalid",
 115                                                *argv);
 116                         } else {
 117                                 invarg("Illegal meta use type", *argv);
 118                         }
 119                 } else if (matches(*argv, "type") == 0) {
 120                         NEXT_ARG();
 121                         if (get_u16(&ife_type, *argv, 0))
 122                                 invarg("ife type is invalid", *argv);
 123                         fprintf(stderr, "IFE type 0x%04X\n", ife_type);
 124                         user_type = 1;
 125                 } else if (matches(*argv, "dst") == 0) {
 126                         NEXT_ARG();
 127                         daddr = *argv;
 128                         if (sscanf(daddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 129                                    dbuf, dbuf + 1, dbuf + 2,
 130                                    dbuf + 3, dbuf + 4, dbuf + 5) != 6) {
 131                                 invarg("Invalid mac address", *argv);
 132                         }
 133                         fprintf(stderr, "dst MAC address <%s>\n", daddr);
 134
 135                 } else if (matches(*argv, "src") == 0) {
 136                         NEXT_ARG();
 137                         saddr = *argv;
 138                         if (sscanf(saddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 139                                    sbuf, sbuf + 1, sbuf + 2,
 140                                    sbuf + 3, sbuf + 4, sbuf + 5) != 6) {
 141                                 invarg("Invalid mac address", *argv);
 142                         }
 143                         fprintf(stderr, "src MAC address <%s>\n", saddr);
 144                 } else if (matches(*argv, "help") == 0) {
 145                         ife_usage();
 146                 } else {
 147                         break;
 148                 }
 149
 150                 argc--;
 151                 argv++;
 152         }
 153
 154         parse_action_control_dflt(&argc, &argv, &p.action, false, TC_ACT_PIPE);
 155
 156         if (argc) {
 157                 if (matches(*argv, "index") == 0) {
 158                         NEXT_ARG();
 159                         if (get_u32(&p.index, *argv, 0)) {
 160                                 fprintf(stderr, "ife: Illegal \"index\"\n");
 161                                 return -1;
 162                         }
 163                         ok++;
 164                         argc--;
 165                         argv++;
 166                 }
 167         }
 168
 169         if (!ok) {
 170                 fprintf(stderr, "IFE requires decode/encode specified\n");
 171                 ife_usage();
 172         }
 173
 174         tail = addattr_nest(n, MAX_MSG, tca_id);
 175         addattr_l(n, MAX_MSG, TCA_IFE_PARMS, &p, sizeof(p));
 176
 177         if (!(p.flags & IFE_ENCODE))
 178                 goto skip_encode;
 179
 180         if (daddr)
 181                 addattr_l(n, MAX_MSG, TCA_IFE_DMAC, dbuf, ETH_ALEN);
 182         if (user_type)
 183                 addattr_l(n, MAX_MSG, TCA_IFE_TYPE, &ife_type, 2);
 184         else
 185                 fprintf(stderr, "IFE type 0x%04X\n", ETH_P_IFE);
 186         if (saddr)
 187                 addattr_l(n, MAX_MSG, TCA_IFE_SMAC, sbuf, ETH_ALEN);
 188
 189         tail2 = addattr_nest(n, MAX_MSG, TCA_IFE_METALST);
 190         if (ife_mark || ife_mark_v) {
 191                 if (ife_mark_v)
 192                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, &ife_mark_v, 4);
 193                 else
 194                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, NULL, 0);
 195         }
 196         if (ife_prio || ife_prio_v) {
 197                 if (ife_prio_v)
 198                         addattr_l(n, MAX_MSG, IFE_META_PRIO, &ife_prio_v, 4);
 199                 else
 200                         addattr_l(n, MAX_MSG, IFE_META_PRIO, NULL, 0);
 201         }
 202         if (ife_tcindex || ife_tcindex_v) {
 203                 if (ife_tcindex_v)
 204                         addattr_l(n, MAX_MSG, IFE_META_TCINDEX, &ife_tcindex_v,
 205                                   2);
 206                 else
 207                         addattr_l(n, MAX_MSG, IFE_META_TCINDEX, NULL, 0);
 208         }
 209
 210         addattr_nest_end(n, tail2);
 211
 212 skip_encode:
 213         addattr_nest_end(n, tail);
 214
 215         *argc_p = argc;
 216         *argv_p = argv;
 217         return 0;
 218 }
 219
 220 static int print_ife(struct action_util *au, FILE *f, struct rtattr *arg)
 221 {
 222         struct tc_ife *p = NULL;
 223         struct rtattr *tb[TCA_IFE_MAX + 1];
 224         __u16 ife_type = 0;
 225         __u32 mmark = 0;
 226         __u16 mtcindex = 0;
 227         __u32 mprio = 0;
 228         int has_optional = 0;
 229         SPRINT_BUF(b2);
 230
 231         if (arg == NULL)
 232                 return -1;
 233
 234         parse_rtattr_nested(tb, TCA_IFE_MAX, arg);
 235
 236         if (tb[TCA_IFE_PARMS] == NULL) {
 237                 print_string(PRINT_FP, NULL, "%s", "[NULL ife parameters]");
 238                 return -1;
 239         }
 240         p = RTA_DATA(tb[TCA_IFE_PARMS]);
 241
 242         print_string(PRINT_ANY, "kind", "%s ", "ife");
 243         print_string(PRINT_ANY, "mode", "%s ",
 244                      p->flags & IFE_ENCODE ? "encode" : "decode");
 245         print_action_control(f, "action ", p->action, " ");
 246
 247         if (tb[TCA_IFE_TYPE]) {
 248                 ife_type = rta_getattr_u16(tb[TCA_IFE_TYPE]);
 249                 has_optional = 1;
 250                 print_0xhex(PRINT_ANY, "type", "type %#llX ", ife_type);
 251         }
 252
 253         if (has_optional)
 254                 print_string(PRINT_FP, NULL, "%s\t", _SL_);
 255
 256         if (tb[TCA_IFE_METALST]) {
 257                 struct rtattr *metalist[IFE_META_MAX + 1];
 258                 int len = 0;
 259
 260                 parse_rtattr_nested(metalist, IFE_META_MAX,
 261                                     tb[TCA_IFE_METALST]);
 262
 263                 if (metalist[IFE_META_SKBMARK]) {
 264                         len = RTA_PAYLOAD(metalist[IFE_META_SKBMARK]);
 265                         if (len) {
 266                                 mmark = rta_getattr_u32(metalist[IFE_META_SKBMARK]);
 267                                 print_uint(PRINT_ANY, "mark", "use mark %u ",
 268                                            mmark);
 269                         } else
 270                                 print_string(PRINT_ANY, "mark", "%s mark ",
 271                                              "allow");
 272                 }
 273
 274                 if (metalist[IFE_META_TCINDEX]) {
 275                         len = RTA_PAYLOAD(metalist[IFE_META_TCINDEX]);
 276                         if (len) {
 277                                 mtcindex =
 278                                         rta_getattr_u16(metalist[IFE_META_TCINDEX]);
 279                                 print_uint(PRINT_ANY, "tcindex",
 280                                            "use tcindex %u ", mtcindex);
 281                         } else
 282                                 print_string(PRINT_ANY, "tcindex",
 283                                              "%s tcindex ", "allow");
 284                 }
 285
 286                 if (metalist[IFE_META_PRIO]) {
 287                         len = RTA_PAYLOAD(metalist[IFE_META_PRIO]);
 288                         if (len) {
 289                                 mprio = rta_getattr_u32(metalist[IFE_META_PRIO]);
 290                                 print_uint(PRINT_ANY, "prio", "use prio %u ",
 291                                            mprio);
 292                         } else
 293                                 print_string(PRINT_ANY, "prio", "%s prio ",
 294                                              "allow");
 295                 }
 296
 297         }
 298
 299         if (tb[TCA_IFE_DMAC]) {
 300                 has_optional = 1;
 301                 print_string(PRINT_ANY, "dst", "dst %s ",
 302                              ll_addr_n2a(RTA_DATA(tb[TCA_IFE_DMAC]),
 303                                          RTA_PAYLOAD(tb[TCA_IFE_DMAC]), 0, b2,
 304                                          sizeof(b2)));
 305         }
 306
 307         if (tb[TCA_IFE_SMAC]) {
 308                 has_optional = 1;
 309                 print_string(PRINT_ANY, "src", "src %s ",
 310                              ll_addr_n2a(RTA_DATA(tb[TCA_IFE_SMAC]),
 311                                          RTA_PAYLOAD(tb[TCA_IFE_SMAC]), 0, b2,
 312                                          sizeof(b2)));
 313         }
 314
 315         print_string(PRINT_FP, NULL, "%s", _SL_);
 316         print_uint(PRINT_ANY, "index", "\t index %u", p->index);
 317         print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
 318         print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
 319
 320         if (show_stats) {
 321                 if (tb[TCA_IFE_TM]) {
 322                         struct tcf_t *tm = RTA_DATA(tb[TCA_IFE_TM]);
 323
 324                         print_tm(f, tm);
 325                 }
 326         }
 327
 328         print_string(PRINT_FP, NULL, "%s", _SL_);
 329
 330         return 0;
 331 }
 332
 333 struct action_util ife_action_util = {
 334         .id = "ife",
 335         .parse_aopt = parse_ife,
 336         .print_aopt = print_ife,
 337 };