1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
3 */
4
5 #include <stdbool.h>
6
7 #include <rte_ether.h>
8 #include <rte_errno.h>
9
10 void
rte_eth_random_addr(uint8_t * addr)11 rte_eth_random_addr(uint8_t *addr)
12 {
13 uint64_t rand = rte_rand();
14 uint8_t *p = (uint8_t *)&rand;
15
16 rte_memcpy(addr, p, RTE_ETHER_ADDR_LEN);
17 addr[0] &= (uint8_t)~RTE_ETHER_GROUP_ADDR; /* clear multicast bit */
18 addr[0] |= RTE_ETHER_LOCAL_ADMIN_ADDR; /* set local assignment bit */
19 }
20
21 void
rte_ether_format_addr(char * buf,uint16_t size,const struct rte_ether_addr * eth_addr)22 rte_ether_format_addr(char *buf, uint16_t size,
23 const struct rte_ether_addr *eth_addr)
24 {
25 snprintf(buf, size, RTE_ETHER_ADDR_PRT_FMT,
26 RTE_ETHER_ADDR_BYTES(eth_addr));
27 }
28
get_xdigit(char ch)29 static int8_t get_xdigit(char ch)
30 {
31 if (ch >= '0' && ch <= '9')
32 return ch - '0';
33 if (ch >= 'a' && ch <= 'f')
34 return ch - 'a' + 10;
35 if (ch >= 'A' && ch <= 'F')
36 return ch - 'A' + 10;
37 return -1;
38 }
39
40 /* Convert 00:11:22:33:44:55 to ethernet address */
get_ether_addr6(const char * s0,struct rte_ether_addr * ea)41 static bool get_ether_addr6(const char *s0, struct rte_ether_addr *ea)
42 {
43 const char *s = s0;
44 int i;
45
46 for (i = 0; i < RTE_ETHER_ADDR_LEN; i++) {
47 int8_t x;
48
49 x = get_xdigit(*s++);
50 if (x < 0)
51 return false;
52
53 ea->addr_bytes[i] = x << 4;
54 x = get_xdigit(*s++);
55 if (x < 0)
56 return false;
57 ea->addr_bytes[i] |= x;
58
59 if (i < RTE_ETHER_ADDR_LEN - 1 &&
60 *s++ != ':')
61 return false;
62 }
63
64 /* return true if at end of string */
65 return *s == '\0';
66 }
67
68 /* Convert 0011:2233:4455 to ethernet address */
get_ether_addr3(const char * s,struct rte_ether_addr * ea)69 static bool get_ether_addr3(const char *s, struct rte_ether_addr *ea)
70 {
71 int i, j;
72
73 for (i = 0; i < RTE_ETHER_ADDR_LEN; i += 2) {
74 uint16_t w = 0;
75
76 for (j = 0; j < 4; j++) {
77 int8_t x;
78
79 x = get_xdigit(*s++);
80 if (x < 0)
81 return false;
82 w = (w << 4) | x;
83 }
84 ea->addr_bytes[i] = w >> 8;
85 ea->addr_bytes[i + 1] = w & 0xff;
86
87 if (i < RTE_ETHER_ADDR_LEN - 2 &&
88 *s++ != ':')
89 return false;
90 }
91
92 return *s == '\0';
93 }
94
95 /*
96 * Like ether_aton_r but can handle either
97 * XX:XX:XX:XX:XX:XX or XXXX:XXXX:XXXX
98 * and is more restrictive.
99 */
100 int
rte_ether_unformat_addr(const char * s,struct rte_ether_addr * ea)101 rte_ether_unformat_addr(const char *s, struct rte_ether_addr *ea)
102 {
103 if (get_ether_addr6(s, ea))
104 return 0;
105 if (get_ether_addr3(s, ea))
106 return 0;
107
108 rte_errno = EINVAL;
109 return -1;
110 }
111