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} [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                 "\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;
  60         struct rtattr *tail;
  61         struct rtattr *tail2;
  62         char dbuf[ETH_ALEN];
  63         char sbuf[ETH_ALEN];
  64         __u16 ife_type = 0;
  65         __u32 ife_prio = 0;
  66         __u32 ife_prio_v = 0;
  67         __u32 ife_mark = 0;
  68         __u32 ife_mark_v = 0;
  69         char *daddr = NULL;
  70         char *saddr = NULL;
  71
  72         memset(&p, 0, sizeof(p));
  73         p.action = TC_ACT_PIPE; /* good default */
  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 {
  95                                 fprintf(stderr, "Illegal meta define <%s>\n",
  96                                         *argv);
  97                                 return -1;
  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 {
 112                                 fprintf(stderr, "Illegal meta use type <%s>\n",
 113                                         *argv);
 114                                 return -1;
 115                         }
 116                 } else if (matches(*argv, "type") == 0) {
 117                         NEXT_ARG();
 118                         if (get_u16(&ife_type, *argv, 0))
 119                                 invarg("ife type is invalid", *argv);
 120                         fprintf(stderr, "IFE type 0x%x\n", ife_type);
 121                 } else if (matches(*argv, "dst") == 0) {
 122                         NEXT_ARG();
 123                         daddr = *argv;
 124                         if (sscanf(daddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 125                                    dbuf, dbuf + 1, dbuf + 2,
 126                                    dbuf + 3, dbuf + 4, dbuf + 5) != 6) {
 127                                 fprintf(stderr, "Invalid mac address %s\n",
 128                                         daddr);
 129                         }
 130                         fprintf(stderr, "dst MAC address <%s>\n", daddr);
 131
 132                 } else if (matches(*argv, "src") == 0) {
 133                         NEXT_ARG();
 134                         saddr = *argv;
 135                         if (sscanf(saddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 136                                    sbuf, sbuf + 1, sbuf + 2,
 137                                    sbuf + 3, sbuf + 4, sbuf + 5) != 6) {
 138                                 fprintf(stderr, "Invalid mac address %s\n",
 139                                         saddr);
 140                         }
 141                         fprintf(stderr, "src MAC address <%s>\n", saddr);
 142                 } else if (matches(*argv, "help") == 0) {
 143                         ife_usage();
 144                 } else {
 145                         break;
 146                 }
 147
 148                 argc--;
 149                 argv++;
 150         }
 151
 152         if (argc) {
 153                 if (matches(*argv, "reclassify") == 0) {
 154                         p.action = TC_ACT_RECLASSIFY;
 155                         argc--;
 156                         argv++;
 157                 } else if (matches(*argv, "pipe") == 0) {
 158                         p.action = TC_ACT_PIPE;
 159                         argc--;
 160                         argv++;
 161                 } else if (matches(*argv, "drop") == 0 ||
 162                            matches(*argv, "shot") == 0) {
 163                         p.action = TC_ACT_SHOT;
 164                         argc--;
 165                         argv++;
 166                 } else if (matches(*argv, "continue") == 0) {
 167                         p.action = TC_ACT_UNSPEC;
 168                         argc--;
 169                         argv++;
 170                 } else if (matches(*argv, "pass") == 0 ||
 171                            matches(*argv, "ok") == 0) {
 172                         p.action = TC_ACT_OK;
 173                         argc--;
 174                         argv++;
 175                 }
 176         }
 177
 178         if (argc) {
 179                 if (matches(*argv, "index") == 0) {
 180                         NEXT_ARG();
 181                         if (get_u32(&p.index, *argv, 10)) {
 182                                 fprintf(stderr, "ife: Illegal \"index\"\n");
 183                                 return -1;
 184                         }
 185                         ok++;
 186                         argc--;
 187                         argv++;
 188                 }
 189         }
 190
 191         if (!ok) {
 192                 fprintf(stderr, "IFE requires decode/encode specified\n");
 193                 ife_usage();
 194         }
 195
 196         tail = NLMSG_TAIL(n);
 197         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 198         addattr_l(n, MAX_MSG, TCA_IFE_PARMS, &p, sizeof(p));
 199
 200         if (!(p.flags & IFE_ENCODE))
 201                 goto skip_encode;
 202
 203         if (daddr)
 204                 addattr_l(n, MAX_MSG, TCA_IFE_DMAC, dbuf, ETH_ALEN);
 205         if (ife_type)
 206                 addattr_l(n, MAX_MSG, TCA_IFE_TYPE, &ife_type, 2);
 207         if (saddr)
 208                 addattr_l(n, MAX_MSG, TCA_IFE_SMAC, sbuf, ETH_ALEN);
 209
 210         tail2 = NLMSG_TAIL(n);
 211         addattr_l(n, MAX_MSG, TCA_IFE_METALST, NULL, 0);
 212         if (ife_mark || ife_mark_v) {
 213                 if (ife_mark_v)
 214                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, &ife_mark_v, 4);
 215                 else
 216                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, NULL, 0);
 217         }
 218         if (ife_prio || ife_prio_v) {
 219                 if (ife_prio_v)
 220                         addattr_l(n, MAX_MSG, IFE_META_PRIO, &ife_prio_v, 4);
 221                 else
 222                         addattr_l(n, MAX_MSG, IFE_META_PRIO, NULL, 0);
 223         }
 224
 225         tail2->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail2;
 226
 227 skip_encode:
 228         tail->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail;
 229
 230         *argc_p = argc;
 231         *argv_p = argv;
 232         return 0;
 233 }
 234
 235 static int print_ife(struct action_util *au, FILE *f, struct rtattr *arg)
 236 {
 237         struct tc_ife *p = NULL;
 238         struct rtattr *tb[TCA_IFE_MAX + 1];
 239         __u16 ife_type = 0;
 240         __u32 mmark = 0;
 241         __u32 mhash = 0;
 242         __u32 mprio = 0;
 243         int has_optional = 0;
 244         SPRINT_BUF(b1);
 245         SPRINT_BUF(b2);
 246
 247         if (arg == NULL)
 248                 return -1;
 249
 250         parse_rtattr_nested(tb, TCA_IFE_MAX, arg);
 251
 252         if (tb[TCA_IFE_PARMS] == NULL) {
 253                 fprintf(f, "[NULL ife parameters]");
 254                 return -1;
 255         }
 256         p = RTA_DATA(tb[TCA_IFE_PARMS]);
 257
 258         fprintf(f, "ife %s action %s ",
 259                 (p->flags & IFE_ENCODE) ? "encode" : "decode",
 260                 action_n2a(p->action, b1, sizeof(b1)));
 261
 262         if (tb[TCA_IFE_TYPE]) {
 263                 ife_type = rta_getattr_u16(tb[TCA_IFE_TYPE]);
 264                 has_optional = 1;
 265                 fprintf(f, "type 0x%X ", ife_type);
 266         }
 267
 268         if (has_optional)
 269                 fprintf(f, "\n\t ");
 270
 271         if (tb[TCA_IFE_METALST]) {
 272                 struct rtattr *metalist[IFE_META_MAX + 1];
 273                 int len = 0;
 274
 275                 parse_rtattr_nested(metalist, IFE_META_MAX,
 276                                     tb[TCA_IFE_METALST]);
 277
 278                 if (metalist[IFE_META_SKBMARK]) {
 279                         len = RTA_PAYLOAD(metalist[IFE_META_SKBMARK]);
 280                         if (len) {
 281                                 mmark = rta_getattr_u32(metalist[IFE_META_SKBMARK]);
 282                                 fprintf(f, "use mark %d ", mmark);
 283                         } else
 284                                 fprintf(f, "allow mark ");
 285                 }
 286
 287                 if (metalist[IFE_META_HASHID]) {
 288                         len = RTA_PAYLOAD(metalist[IFE_META_HASHID]);
 289                         if (len) {
 290                                 mhash = rta_getattr_u32(metalist[IFE_META_HASHID]);
 291                                 fprintf(f, "use hash %d ", mhash);
 292                         } else
 293                                 fprintf(f, "allow hash ");
 294                 }
 295
 296                 if (metalist[IFE_META_PRIO]) {
 297                         len = RTA_PAYLOAD(metalist[IFE_META_PRIO]);
 298                         if (len) {
 299                                 mprio = rta_getattr_u32(metalist[IFE_META_PRIO]);
 300                                 fprintf(f, "use prio %d ", mprio);
 301                         } else
 302                                 fprintf(f, "allow prio ");
 303                 }
 304
 305         }
 306
 307         if (tb[TCA_IFE_DMAC]) {
 308                 has_optional = 1;
 309                 fprintf(f, "dst %s ",
 310                         ll_addr_n2a(RTA_DATA(tb[TCA_IFE_DMAC]),
 311                                     RTA_PAYLOAD(tb[TCA_IFE_DMAC]), 0, b2,
 312                                     sizeof(b2)));
 313
 314         }
 315
 316         if (tb[TCA_IFE_SMAC]) {
 317                 has_optional = 1;
 318                 fprintf(f, "src %s ",
 319                         ll_addr_n2a(RTA_DATA(tb[TCA_IFE_SMAC]),
 320                                     RTA_PAYLOAD(tb[TCA_IFE_SMAC]), 0, b2,
 321                                     sizeof(b2)));
 322         }
 323
 324         fprintf(f, "\n\t index %d ref %d bind %d", p->index, p->refcnt,
 325                 p->bindcnt);
 326         if (show_stats) {
 327                 if (tb[TCA_IFE_TM]) {
 328                         struct tcf_t *tm = RTA_DATA(tb[TCA_IFE_TM]);
 329
 330                         print_tm(f, tm);
 331                 }
 332         }
 333
 334         fprintf(f, "\n");
 335
 336         return 0;
 337 }
 338
 339 struct action_util ife_action_util = {
 340         .id = "ife",
 341         .parse_aopt = parse_ife,
 342         .print_aopt = print_ife,
 343 };