librte_net/rte_ether.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <rte_ether.h>
   6 #include <rte_errno.h>
   7
   8 void
   9 rte_eth_random_addr(uint8_t *addr)
  10 {
  11         uint64_t rand = rte_rand();
  12         uint8_t *p = (uint8_t *)&rand;
  13
  14         rte_memcpy(addr, p, RTE_ETHER_ADDR_LEN);
  15         addr[0] &= (uint8_t)~RTE_ETHER_GROUP_ADDR;      /* clear multicast bit */
  16         addr[0] |= RTE_ETHER_LOCAL_ADMIN_ADDR;  /* set local assignment bit */
  17 }
  18
  19 void
  20 rte_ether_format_addr(char *buf, uint16_t size,
  21                       const struct rte_ether_addr *eth_addr)
  22 {
  23         snprintf(buf, size, "%02X:%02X:%02X:%02X:%02X:%02X",
  24                  eth_addr->addr_bytes[0],
  25                  eth_addr->addr_bytes[1],
  26                  eth_addr->addr_bytes[2],
  27                  eth_addr->addr_bytes[3],
  28                  eth_addr->addr_bytes[4],
  29                  eth_addr->addr_bytes[5]);
  30 }
  31
  32 /*
  33  * Like ether_aton_r but can handle either
  34  * XX:XX:XX:XX:XX:XX or XXXX:XXXX:XXXX
  35  */
  36 int
  37 rte_ether_unformat_addr(const char *s, struct rte_ether_addr *ea)
  38 {
  39         unsigned int o0, o1, o2, o3, o4, o5;
  40         int n;
  41
  42         n = sscanf(s, "%x:%x:%x:%x:%x:%x",
  43                     &o0, &o1, &o2, &o3, &o4, &o5);
  44
  45         if (n == 6) {
  46                 /* Standard format XX:XX:XX:XX:XX:XX */
  47                 if (o0 > UINT8_MAX || o1 > UINT8_MAX || o2 > UINT8_MAX ||
  48                     o3 > UINT8_MAX || o4 > UINT8_MAX || o5 > UINT8_MAX) {
  49                         rte_errno = ERANGE;
  50                         return -1;
  51                 }
  52
  53                 ea->addr_bytes[0] = o0;
  54                 ea->addr_bytes[1] = o1;
  55                 ea->addr_bytes[2] = o2;
  56                 ea->addr_bytes[3] = o3;
  57                 ea->addr_bytes[4] = o4;
  58                 ea->addr_bytes[5] = o5;
  59         } else if (n == 3) {
  60                 /* Support the format XXXX:XXXX:XXXX */
  61                 if (o0 > UINT16_MAX || o1 > UINT16_MAX || o2 > UINT16_MAX) {
  62                         rte_errno = ERANGE;
  63                         return -1;
  64                 }
  65
  66                 ea->addr_bytes[0] = o0 >> 8;
  67                 ea->addr_bytes[1] = o0 & 0xff;
  68                 ea->addr_bytes[2] = o1 >> 8;
  69                 ea->addr_bytes[3] = o1 & 0xff;
  70                 ea->addr_bytes[4] = o2 >> 8;
  71                 ea->addr_bytes[5] = o2 & 0xff;
  72         } else {
  73                 /* unknown format */
  74                 rte_errno = EINVAL;
  75                 return -1;
  76         }
  77         return 0;
  78 }