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