ip/iplink_geneve.c

   1 /*
   2  * iplink_geneve.c      GENEVE device support
   3  *
   4  *              This program is free software; you can redistribute 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:     John W. Linville <linville@tuxdriver.com>
  10  */
  11
  12 #include <stdio.h>
  13
  14 #include "rt_names.h"
  15 #include "utils.h"
  16 #include "ip_common.h"
  17
  18 static void print_explain(FILE *f)
  19 {
  20         fprintf(f,
  21                 "Usage: ... geneve id VNI\n"
  22                 "                  remote ADDR\n"
  23                 "                  [ ttl TTL ]\n"
  24                 "                  [ tos TOS ]\n"
  25                 "                  [ flowlabel LABEL ]\n"
  26                 "                  [ dstport PORT ]\n"
  27                 "                  [ [no]external ]\n"
  28                 "                  [ [no]udpcsum ]\n"
  29                 "                  [ [no]udp6zerocsumtx ]\n"
  30                 "                  [ [no]udp6zerocsumrx ]\n"
  31                 "\n"
  32                 "Where: VNI   := 0-16777215\n"
  33                 "       ADDR  := IP_ADDRESS\n"
  34                 "       TOS   := { NUMBER | inherit }\n"
  35                 "       TTL   := { 1..255 | inherit }\n"
  36                 "       LABEL := 0-1048575\n"
  37         );
  38 }
  39
  40 static void explain(void)
  41 {
  42         print_explain(stderr);
  43 }
  44
  45 static int geneve_parse_opt(struct link_util *lu, int argc, char **argv,
  46                           struct nlmsghdr *n)
  47 {
  48         __u32 vni = 0;
  49         int vni_set = 0;
  50         __u32 daddr = 0;
  51         struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
  52         __u32 label = 0;
  53         __u8 ttl = 0;
  54         __u8 tos = 0;
  55         __u16 dstport = 0;
  56         bool metadata = 0;
  57         __u8 udpcsum = 0;
  58         bool udpcsum_set = false;
  59         __u8 udp6zerocsumtx = 0;
  60         bool udp6zerocsumtx_set = false;
  61         __u8 udp6zerocsumrx = 0;
  62         bool udp6zerocsumrx_set = false;
  63
  64         while (argc > 0) {
  65                 if (!matches(*argv, "id") ||
  66                     !matches(*argv, "vni")) {
  67                         NEXT_ARG();
  68                         if (get_u32(&vni, *argv, 0) ||
  69                             vni >= 1u << 24)
  70                                 invarg("invalid id", *argv);
  71                         vni_set = 1;
  72                 } else if (!matches(*argv, "remote")) {
  73                         NEXT_ARG();
  74                         if (!inet_get_addr(*argv, &daddr, &daddr6)) {
  75                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  76                                 return -1;
  77                         }
  78                         if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
  79                                 invarg("invalid remote address", *argv);
  80                 } else if (!matches(*argv, "ttl") ||
  81                            !matches(*argv, "hoplimit")) {
  82                         unsigned int uval;
  83
  84                         NEXT_ARG();
  85                         if (strcmp(*argv, "inherit") != 0) {
  86                                 if (get_unsigned(&uval, *argv, 0))
  87                                         invarg("invalid TTL", *argv);
  88                                 if (uval > 255)
  89                                         invarg("TTL must be <= 255", *argv);
  90                                 ttl = uval;
  91                         }
  92                 } else if (!matches(*argv, "tos") ||
  93                            !matches(*argv, "dsfield")) {
  94                         __u32 uval;
  95
  96                         NEXT_ARG();
  97                         if (strcmp(*argv, "inherit") != 0) {
  98                                 if (rtnl_dsfield_a2n(&uval, *argv))
  99                                         invarg("bad TOS value", *argv);
 100                                 tos = uval;
 101                         } else
 102                                 tos = 1;
 103                 } else if (!matches(*argv, "label") ||
 104                            !matches(*argv, "flowlabel")) {
 105                         __u32 uval;
 106
 107                         NEXT_ARG();
 108                         if (get_u32(&uval, *argv, 0) ||
 109                             (uval & ~LABEL_MAX_MASK))
 110                                 invarg("invalid flowlabel", *argv);
 111                         label = htonl(uval);
 112                 } else if (!matches(*argv, "dstport")) {
 113                         NEXT_ARG();
 114                         if (get_u16(&dstport, *argv, 0))
 115                                 invarg("dstport", *argv);
 116                 } else if (!matches(*argv, "external")) {
 117                         metadata = true;
 118                 } else if (!matches(*argv, "noexternal")) {
 119                         metadata = false;
 120                 } else if (!matches(*argv, "udpcsum")) {
 121                         udpcsum = 1;
 122                         udpcsum_set = true;
 123                 } else if (!matches(*argv, "noudpcsum")) {
 124                         udpcsum = 0;
 125                         udpcsum_set = true;
 126                 } else if (!matches(*argv, "udp6zerocsumtx")) {
 127                         udp6zerocsumtx = 1;
 128                         udp6zerocsumtx_set = true;
 129                 } else if (!matches(*argv, "noudp6zerocsumtx")) {
 130                         udp6zerocsumtx = 0;
 131                         udp6zerocsumtx_set = true;
 132                 } else if (!matches(*argv, "udp6zerocsumrx")) {
 133                         udp6zerocsumrx = 1;
 134                         udp6zerocsumrx_set = true;
 135                 } else if (!matches(*argv, "noudp6zerocsumrx")) {
 136                         udp6zerocsumrx = 0;
 137                         udp6zerocsumrx_set = true;
 138                 } else if (matches(*argv, "help") == 0) {
 139                         explain();
 140                         return -1;
 141                 } else {
 142                         fprintf(stderr, "geneve: unknown command \"%s\"?\n", *argv);
 143                         explain();
 144                         return -1;
 145                 }
 146                 argc--, argv++;
 147         }
 148
 149         if (metadata && vni_set) {
 150                 fprintf(stderr, "geneve: both 'external' and vni cannot be specified\n");
 151                 return -1;
 152         }
 153
 154         if (!metadata) {
 155                 /* parameter checking make sense only for full geneve tunnels */
 156                 if (!vni_set) {
 157                         fprintf(stderr, "geneve: missing virtual network identifier\n");
 158                         return -1;
 159                 }
 160
 161                 if (!daddr && IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
 162                         fprintf(stderr, "geneve: remote link partner not specified\n");
 163                         return -1;
 164                 }
 165         }
 166
 167         addattr32(n, 1024, IFLA_GENEVE_ID, vni);
 168         if (daddr)
 169                 addattr_l(n, 1024, IFLA_GENEVE_REMOTE, &daddr, 4);
 170         if (!IN6_IS_ADDR_UNSPECIFIED(&daddr6))
 171                 addattr_l(n, 1024, IFLA_GENEVE_REMOTE6, &daddr6, sizeof(struct in6_addr));
 172         addattr32(n, 1024, IFLA_GENEVE_LABEL, label);
 173         addattr8(n, 1024, IFLA_GENEVE_TTL, ttl);
 174         addattr8(n, 1024, IFLA_GENEVE_TOS, tos);
 175         if (dstport)
 176                 addattr16(n, 1024, IFLA_GENEVE_PORT, htons(dstport));
 177         if (metadata)
 178                 addattr(n, 1024, IFLA_GENEVE_COLLECT_METADATA);
 179         if (udpcsum_set)
 180                 addattr8(n, 1024, IFLA_GENEVE_UDP_CSUM, udpcsum);
 181         if (udp6zerocsumtx_set)
 182                 addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
 183         if (udp6zerocsumrx_set)
 184                 addattr8(n, 1024, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
 185
 186         return 0;
 187 }
 188
 189 static void geneve_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 190 {
 191         __u32 vni;
 192         __u8 tos;
 193
 194         if (!tb)
 195                 return;
 196
 197         if (!tb[IFLA_GENEVE_ID] ||
 198             RTA_PAYLOAD(tb[IFLA_GENEVE_ID]) < sizeof(__u32))
 199                 return;
 200
 201         vni = rta_getattr_u32(tb[IFLA_GENEVE_ID]);
 202         fprintf(f, "id %u ", vni);
 203
 204         if (tb[IFLA_GENEVE_REMOTE]) {
 205                 __be32 addr = rta_getattr_u32(tb[IFLA_GENEVE_REMOTE]);
 206
 207                 if (addr)
 208                         fprintf(f, "remote %s ",
 209                                 format_host(AF_INET, 4, &addr));
 210         } else if (tb[IFLA_GENEVE_REMOTE6]) {
 211                 struct in6_addr addr;
 212
 213                 memcpy(&addr, RTA_DATA(tb[IFLA_GENEVE_REMOTE6]), sizeof(struct in6_addr));
 214                 if (!IN6_IS_ADDR_UNSPECIFIED(&addr)) {
 215                         if (!IN6_IS_ADDR_MULTICAST(&addr))
 216                                 fprintf(f, "remote %s ",
 217                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 218                 }
 219         }
 220
 221         if (tb[IFLA_GENEVE_TTL]) {
 222                 __u8 ttl = rta_getattr_u8(tb[IFLA_GENEVE_TTL]);
 223
 224                 if (ttl)
 225                         fprintf(f, "ttl %d ", ttl);
 226         }
 227
 228         if (tb[IFLA_GENEVE_TOS] &&
 229             (tos = rta_getattr_u8(tb[IFLA_GENEVE_TOS]))) {
 230                 if (tos == 1)
 231                         fprintf(f, "tos inherit ");
 232                 else
 233                         fprintf(f, "tos %#x ", tos);
 234         }
 235
 236         if (tb[IFLA_GENEVE_LABEL]) {
 237                 __u32 label = rta_getattr_u32(tb[IFLA_GENEVE_LABEL]);
 238
 239                 if (label)
 240                         fprintf(f, "flowlabel %#x ", ntohl(label));
 241         }
 242
 243         if (tb[IFLA_GENEVE_PORT])
 244                 fprintf(f, "dstport %u ",
 245                         rta_getattr_be16(tb[IFLA_GENEVE_PORT]));
 246
 247         if (tb[IFLA_GENEVE_COLLECT_METADATA])
 248                 fputs("external ", f);
 249
 250         if (tb[IFLA_GENEVE_UDP_CSUM]) {
 251                 if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_CSUM]))
 252                         fputs("no", f);
 253                 fputs("udpcsum ", f);
 254         }
 255
 256         if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
 257                 if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
 258                         fputs("no", f);
 259                 fputs("udp6zerocsumtx ", f);
 260         }
 261
 262         if (tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
 263                 if (!rta_getattr_u8(tb[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
 264                         fputs("no", f);
 265                 fputs("udp6zerocsumrx ", f);
 266         }
 267 }
 268
 269 static void geneve_print_help(struct link_util *lu, int argc, char **argv,
 270         FILE *f)
 271 {
 272         print_explain(f);
 273 }
 274
 275 struct link_util geneve_link_util = {
 276         .id             = "geneve",
 277         .maxattr        = IFLA_GENEVE_MAX,
 278         .parse_opt      = geneve_parse_opt,
 279         .print_opt      = geneve_print_opt,
 280         .print_help     = geneve_print_help,
 281 };