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 = { .action = TC_ACT_PIPE };    /* good default */
  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         char *daddr = NULL;
  71         char *saddr = NULL;
  72
  73         if (argc <= 0)
  74                 return -1;
  75
  76         while (argc > 0) {
  77                 if (matches(*argv, "ife") == 0) {
  78                         NEXT_ARG();
  79                         continue;
  80                 } else if (matches(*argv, "decode") == 0) {
  81                         p.flags = IFE_DECODE; /* readability aid */
  82                         ok++;
  83                 } else if (matches(*argv, "encode") == 0) {
  84                         p.flags = IFE_ENCODE;
  85                         ok++;
  86                 } else if (matches(*argv, "allow") == 0) {
  87                         NEXT_ARG();
  88                         if (matches(*argv, "mark") == 0) {
  89                                 ife_mark = IFE_META_SKBMARK;
  90                         } else if (matches(*argv, "prio") == 0) {
  91                                 ife_prio = IFE_META_PRIO;
  92                         } else {
  93                                 fprintf(stderr, "Illegal meta define <%s>\n",
  94                                         *argv);
  95                                 return -1;
  96                         }
  97                 } else if (matches(*argv, "use") == 0) {
  98                         NEXT_ARG();
  99                         if (matches(*argv, "mark") == 0) {
 100                                 NEXT_ARG();
 101                                 if (get_u32(&ife_mark_v, *argv, 0))
 102                                         invarg("ife mark val is invalid",
 103                                                *argv);
 104                         } else if (matches(*argv, "prio") == 0) {
 105                                 NEXT_ARG();
 106                                 if (get_u32(&ife_prio_v, *argv, 0))
 107                                         invarg("ife prio val is invalid",
 108                                                *argv);
 109                         } else {
 110                                 fprintf(stderr, "Illegal meta use type <%s>\n",
 111                                         *argv);
 112                                 return -1;
 113                         }
 114                 } else if (matches(*argv, "type") == 0) {
 115                         NEXT_ARG();
 116                         if (get_u16(&ife_type, *argv, 0))
 117                                 invarg("ife type is invalid", *argv);
 118                         fprintf(stderr, "IFE type 0x%x\n", ife_type);
 119                 } else if (matches(*argv, "dst") == 0) {
 120                         NEXT_ARG();
 121                         daddr = *argv;
 122                         if (sscanf(daddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 123                                    dbuf, dbuf + 1, dbuf + 2,
 124                                    dbuf + 3, dbuf + 4, dbuf + 5) != 6) {
 125                                 fprintf(stderr, "Invalid mac address %s\n",
 126                                         daddr);
 127                         }
 128                         fprintf(stderr, "dst MAC address <%s>\n", daddr);
 129
 130                 } else if (matches(*argv, "src") == 0) {
 131                         NEXT_ARG();
 132                         saddr = *argv;
 133                         if (sscanf(saddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 134                                    sbuf, sbuf + 1, sbuf + 2,
 135                                    sbuf + 3, sbuf + 4, sbuf + 5) != 6) {
 136                                 fprintf(stderr, "Invalid mac address %s\n",
 137                                         saddr);
 138                         }
 139                         fprintf(stderr, "src MAC address <%s>\n", saddr);
 140                 } else if (matches(*argv, "help") == 0) {
 141                         ife_usage();
 142                 } else {
 143                         break;
 144                 }
 145
 146                 argc--;
 147                 argv++;
 148         }
 149
 150         if (argc && !action_a2n(*argv, &p.action, false))
 151                 NEXT_ARG_FWD();
 152
 153         if (argc) {
 154                 if (matches(*argv, "index") == 0) {
 155                         NEXT_ARG();
 156                         if (get_u32(&p.index, *argv, 0)) {
 157                                 fprintf(stderr, "ife: Illegal \"index\"\n");
 158                                 return -1;
 159                         }
 160                         ok++;
 161                         argc--;
 162                         argv++;
 163                 }
 164         }
 165
 166         if (!ok) {
 167                 fprintf(stderr, "IFE requires decode/encode specified\n");
 168                 ife_usage();
 169         }
 170
 171         tail = NLMSG_TAIL(n);
 172         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 173         addattr_l(n, MAX_MSG, TCA_IFE_PARMS, &p, sizeof(p));
 174
 175         if (!(p.flags & IFE_ENCODE))
 176                 goto skip_encode;
 177
 178         if (daddr)
 179                 addattr_l(n, MAX_MSG, TCA_IFE_DMAC, dbuf, ETH_ALEN);
 180         if (ife_type)
 181                 addattr_l(n, MAX_MSG, TCA_IFE_TYPE, &ife_type, 2);
 182         if (saddr)
 183                 addattr_l(n, MAX_MSG, TCA_IFE_SMAC, sbuf, ETH_ALEN);
 184
 185         tail2 = NLMSG_TAIL(n);
 186         addattr_l(n, MAX_MSG, TCA_IFE_METALST, NULL, 0);
 187         if (ife_mark || ife_mark_v) {
 188                 if (ife_mark_v)
 189                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, &ife_mark_v, 4);
 190                 else
 191                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, NULL, 0);
 192         }
 193         if (ife_prio || ife_prio_v) {
 194                 if (ife_prio_v)
 195                         addattr_l(n, MAX_MSG, IFE_META_PRIO, &ife_prio_v, 4);
 196                 else
 197                         addattr_l(n, MAX_MSG, IFE_META_PRIO, NULL, 0);
 198         }
 199
 200         tail2->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail2;
 201
 202 skip_encode:
 203         tail->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail;
 204
 205         *argc_p = argc;
 206         *argv_p = argv;
 207         return 0;
 208 }
 209
 210 static int print_ife(struct action_util *au, FILE *f, struct rtattr *arg)
 211 {
 212         struct tc_ife *p = NULL;
 213         struct rtattr *tb[TCA_IFE_MAX + 1];
 214         __u16 ife_type = 0;
 215         __u32 mmark = 0;
 216         __u32 mhash = 0;
 217         __u32 mprio = 0;
 218         int has_optional = 0;
 219         SPRINT_BUF(b2);
 220
 221         if (arg == NULL)
 222                 return -1;
 223
 224         parse_rtattr_nested(tb, TCA_IFE_MAX, arg);
 225
 226         if (tb[TCA_IFE_PARMS] == NULL) {
 227                 fprintf(f, "[NULL ife parameters]");
 228                 return -1;
 229         }
 230         p = RTA_DATA(tb[TCA_IFE_PARMS]);
 231
 232         fprintf(f, "ife %s action %s ",
 233                 (p->flags & IFE_ENCODE) ? "encode" : "decode",
 234                 action_n2a(p->action));
 235
 236         if (tb[TCA_IFE_TYPE]) {
 237                 ife_type = rta_getattr_u16(tb[TCA_IFE_TYPE]);
 238                 has_optional = 1;
 239                 fprintf(f, "type 0x%X ", ife_type);
 240         }
 241
 242         if (has_optional)
 243                 fprintf(f, "\n\t ");
 244
 245         if (tb[TCA_IFE_METALST]) {
 246                 struct rtattr *metalist[IFE_META_MAX + 1];
 247                 int len = 0;
 248
 249                 parse_rtattr_nested(metalist, IFE_META_MAX,
 250                                     tb[TCA_IFE_METALST]);
 251
 252                 if (metalist[IFE_META_SKBMARK]) {
 253                         len = RTA_PAYLOAD(metalist[IFE_META_SKBMARK]);
 254                         if (len) {
 255                                 mmark = rta_getattr_u32(metalist[IFE_META_SKBMARK]);
 256                                 fprintf(f, "use mark %u ", mmark);
 257                         } else
 258                                 fprintf(f, "allow mark ");
 259                 }
 260
 261                 if (metalist[IFE_META_HASHID]) {
 262                         len = RTA_PAYLOAD(metalist[IFE_META_HASHID]);
 263                         if (len) {
 264                                 mhash = rta_getattr_u32(metalist[IFE_META_HASHID]);
 265                                 fprintf(f, "use hash %u ", mhash);
 266                         } else
 267                                 fprintf(f, "allow hash ");
 268                 }
 269
 270                 if (metalist[IFE_META_PRIO]) {
 271                         len = RTA_PAYLOAD(metalist[IFE_META_PRIO]);
 272                         if (len) {
 273                                 mprio = rta_getattr_u32(metalist[IFE_META_PRIO]);
 274                                 fprintf(f, "use prio %u ", mprio);
 275                         } else
 276                                 fprintf(f, "allow prio ");
 277                 }
 278
 279         }
 280
 281         if (tb[TCA_IFE_DMAC]) {
 282                 has_optional = 1;
 283                 fprintf(f, "dst %s ",
 284                         ll_addr_n2a(RTA_DATA(tb[TCA_IFE_DMAC]),
 285                                     RTA_PAYLOAD(tb[TCA_IFE_DMAC]), 0, b2,
 286                                     sizeof(b2)));
 287
 288         }
 289
 290         if (tb[TCA_IFE_SMAC]) {
 291                 has_optional = 1;
 292                 fprintf(f, "src %s ",
 293                         ll_addr_n2a(RTA_DATA(tb[TCA_IFE_SMAC]),
 294                                     RTA_PAYLOAD(tb[TCA_IFE_SMAC]), 0, b2,
 295                                     sizeof(b2)));
 296         }
 297
 298         fprintf(f, "\n\t index %d ref %d bind %d", p->index, p->refcnt,
 299                 p->bindcnt);
 300         if (show_stats) {
 301                 if (tb[TCA_IFE_TM]) {
 302                         struct tcf_t *tm = RTA_DATA(tb[TCA_IFE_TM]);
 303
 304                         print_tm(f, tm);
 305                 }
 306         }
 307
 308         fprintf(f, "\n");
 309
 310         return 0;
 311 }
 312
 313 struct action_util ife_action_util = {
 314         .id = "ife",
 315         .parse_aopt = parse_ife,
 316         .print_aopt = print_ife,
 317 };