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 = { .action = TC_ACT_PIPE };    /* good default */
  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         if (argc <= 0)
  73                 return -1;
  74
  75         while (argc > 0) {
  76                 if (matches(*argv, "ife") == 0) {
  77                         NEXT_ARG();
  78                         continue;
  79                 } else if (matches(*argv, "decode") == 0) {
  80                         p.flags = IFE_DECODE; /* readability aid */
  81                         ok++;
  82                 } else if (matches(*argv, "encode") == 0) {
  83                         p.flags = IFE_ENCODE;
  84                         ok++;
  85                 } else if (matches(*argv, "allow") == 0) {
  86                         NEXT_ARG();
  87                         if (matches(*argv, "mark") == 0) {
  88                                 ife_mark = IFE_META_SKBMARK;
  89                         } else if (matches(*argv, "prio") == 0) {
  90                                 ife_prio = IFE_META_PRIO;
  91                         } else {
  92                                 fprintf(stderr, "Illegal meta define <%s>\n",
  93                                         *argv);
  94                                 return -1;
  95                         }
  96                 } else if (matches(*argv, "use") == 0) {
  97                         NEXT_ARG();
  98                         if (matches(*argv, "mark") == 0) {
  99                                 NEXT_ARG();
 100                                 if (get_u32(&ife_mark_v, *argv, 0))
 101                                         invarg("ife mark val is invalid",
 102                                                *argv);
 103                         } else if (matches(*argv, "prio") == 0) {
 104                                 NEXT_ARG();
 105                                 if (get_u32(&ife_prio_v, *argv, 0))
 106                                         invarg("ife prio val is invalid",
 107                                                *argv);
 108                         } else {
 109                                 fprintf(stderr, "Illegal meta use type <%s>\n",
 110                                         *argv);
 111                                 return -1;
 112                         }
 113                 } else if (matches(*argv, "type") == 0) {
 114                         NEXT_ARG();
 115                         if (get_u16(&ife_type, *argv, 0))
 116                                 invarg("ife type is invalid", *argv);
 117                         fprintf(stderr, "IFE type 0x%x\n", ife_type);
 118                 } else if (matches(*argv, "dst") == 0) {
 119                         NEXT_ARG();
 120                         daddr = *argv;
 121                         if (sscanf(daddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 122                                    dbuf, dbuf + 1, dbuf + 2,
 123                                    dbuf + 3, dbuf + 4, dbuf + 5) != 6) {
 124                                 fprintf(stderr, "Invalid mac address %s\n",
 125                                         daddr);
 126                         }
 127                         fprintf(stderr, "dst MAC address <%s>\n", daddr);
 128
 129                 } else if (matches(*argv, "src") == 0) {
 130                         NEXT_ARG();
 131                         saddr = *argv;
 132                         if (sscanf(saddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 133                                    sbuf, sbuf + 1, sbuf + 2,
 134                                    sbuf + 3, sbuf + 4, sbuf + 5) != 6) {
 135                                 fprintf(stderr, "Invalid mac address %s\n",
 136                                         saddr);
 137                         }
 138                         fprintf(stderr, "src MAC address <%s>\n", saddr);
 139                 } else if (matches(*argv, "help") == 0) {
 140                         ife_usage();
 141                 } else {
 142                         break;
 143                 }
 144
 145                 argc--;
 146                 argv++;
 147         }
 148
 149         if (argc && !action_a2n(*argv, &p.action, false))
 150                 NEXT_ARG_FWD();
 151
 152         if (argc) {
 153                 if (matches(*argv, "index") == 0) {
 154                         NEXT_ARG();
 155                         if (get_u32(&p.index, *argv, 10)) {
 156                                 fprintf(stderr, "ife: Illegal \"index\"\n");
 157                                 return -1;
 158                         }
 159                         ok++;
 160                         argc--;
 161                         argv++;
 162                 }
 163         }
 164
 165         if (!ok) {
 166                 fprintf(stderr, "IFE requires decode/encode specified\n");
 167                 ife_usage();
 168         }
 169
 170         tail = NLMSG_TAIL(n);
 171         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 172         addattr_l(n, MAX_MSG, TCA_IFE_PARMS, &p, sizeof(p));
 173
 174         if (!(p.flags & IFE_ENCODE))
 175                 goto skip_encode;
 176
 177         if (daddr)
 178                 addattr_l(n, MAX_MSG, TCA_IFE_DMAC, dbuf, ETH_ALEN);
 179         if (ife_type)
 180                 addattr_l(n, MAX_MSG, TCA_IFE_TYPE, &ife_type, 2);
 181         if (saddr)
 182                 addattr_l(n, MAX_MSG, TCA_IFE_SMAC, sbuf, ETH_ALEN);
 183
 184         tail2 = NLMSG_TAIL(n);
 185         addattr_l(n, MAX_MSG, TCA_IFE_METALST, NULL, 0);
 186         if (ife_mark || ife_mark_v) {
 187                 if (ife_mark_v)
 188                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, &ife_mark_v, 4);
 189                 else
 190                         addattr_l(n, MAX_MSG, IFE_META_SKBMARK, NULL, 0);
 191         }
 192         if (ife_prio || ife_prio_v) {
 193                 if (ife_prio_v)
 194                         addattr_l(n, MAX_MSG, IFE_META_PRIO, &ife_prio_v, 4);
 195                 else
 196                         addattr_l(n, MAX_MSG, IFE_META_PRIO, NULL, 0);
 197         }
 198
 199         tail2->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail2;
 200
 201 skip_encode:
 202         tail->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail;
 203
 204         *argc_p = argc;
 205         *argv_p = argv;
 206         return 0;
 207 }
 208
 209 static int print_ife(struct action_util *au, FILE *f, struct rtattr *arg)
 210 {
 211         struct tc_ife *p = NULL;
 212         struct rtattr *tb[TCA_IFE_MAX + 1];
 213         __u16 ife_type = 0;
 214         __u32 mmark = 0;
 215         __u32 mhash = 0;
 216         __u32 mprio = 0;
 217         int has_optional = 0;
 218         SPRINT_BUF(b1);
 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, b1, sizeof(b1)));
 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 %d ", 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 %d ", 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 %d ", 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 };