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 #ifdef RTE_EXEC_ENV_WINDOWS /* FIXME: random is not supported */
14 RTE_SET_USED(addr);
15 #else
16 uint64_t rand = rte_rand();
17 uint8_t *p = (uint8_t *)&rand;
18
19 rte_memcpy(addr, p, RTE_ETHER_ADDR_LEN);
20 addr[0] &= (uint8_t)~RTE_ETHER_GROUP_ADDR; /* clear multicast bit */
21 addr[0] |= RTE_ETHER_LOCAL_ADMIN_ADDR; /* set local assignment bit */
22 #endif
23 }
24
25 void
rte_ether_format_addr(char * buf,uint16_t size,const struct rte_ether_addr * eth_addr)26 rte_ether_format_addr(char *buf, uint16_t size,
27 const struct rte_ether_addr *eth_addr)
28 {
29 snprintf(buf, size, "%02X:%02X:%02X:%02X:%02X:%02X",
30 eth_addr->addr_bytes[0],
31 eth_addr->addr_bytes[1],
32 eth_addr->addr_bytes[2],
33 eth_addr->addr_bytes[3],
34 eth_addr->addr_bytes[4],
35 eth_addr->addr_bytes[5]);
36 }
37
get_xdigit(char ch)38 static int8_t get_xdigit(char ch)
39 {
40 if (ch >= '0' && ch <= '9')
41 return ch - '0';
42 if (ch >= 'a' && ch <= 'f')
43 return ch - 'a' + 10;
44 if (ch >= 'A' && ch <= 'F')
45 return ch - 'A' + 10;
46 return -1;
47 }
48
49 /* Convert 00:11:22:33:44:55 to ethernet address */
get_ether_addr6(const char * s0,struct rte_ether_addr * ea)50 static bool get_ether_addr6(const char *s0, struct rte_ether_addr *ea)
51 {
52 const char *s = s0;
53 int i;
54
55 for (i = 0; i < RTE_ETHER_ADDR_LEN; i++) {
56 int8_t x;
57
58 x = get_xdigit(*s++);
59 if (x < 0)
60 return false;
61
62 ea->addr_bytes[i] = x << 4;
63 x = get_xdigit(*s++);
64 if (x < 0)
65 return false;
66 ea->addr_bytes[i] |= x;
67
68 if (i < RTE_ETHER_ADDR_LEN - 1 &&
69 *s++ != ':')
70 return false;
71 }
72
73 /* return true if at end of string */
74 return *s == '\0';
75 }
76
77 /* Convert 0011:2233:4455 to ethernet address */
get_ether_addr3(const char * s,struct rte_ether_addr * ea)78 static bool get_ether_addr3(const char *s, struct rte_ether_addr *ea)
79 {
80 int i, j;
81
82 for (i = 0; i < RTE_ETHER_ADDR_LEN; i += 2) {
83 uint16_t w = 0;
84
85 for (j = 0; j < 4; j++) {
86 int8_t x;
87
88 x = get_xdigit(*s++);
89 if (x < 0)
90 return false;
91 w = (w << 4) | x;
92 }
93 ea->addr_bytes[i] = w >> 8;
94 ea->addr_bytes[i + 1] = w & 0xff;
95
96 if (i < RTE_ETHER_ADDR_LEN - 2 &&
97 *s++ != ':')
98 return false;
99 }
100
101 return *s == '\0';
102 }
103
104 /*
105 * Like ether_aton_r but can handle either
106 * XX:XX:XX:XX:XX:XX or XXXX:XXXX:XXXX
107 * and is more restrictive.
108 */
109 int
rte_ether_unformat_addr(const char * s,struct rte_ether_addr * ea)110 rte_ether_unformat_addr(const char *s, struct rte_ether_addr *ea)
111 {
112 if (get_ether_addr6(s, ea))
113 return 0;
114 if (get_ether_addr3(s, ea))
115 return 0;
116
117 rte_errno = EINVAL;
118 return -1;
119 }
120