1 #include <stdint.h>
2 
3 /* linux/netlink.h */
4 
5 #define NETLINK_ROUTE 0
6 
7 struct nlmsghdr {
8     uint32_t nlmsg_len;
9     uint16_t nlmsg_type;
10     uint16_t nlmsg_flags;
11     uint32_t nlmsg_seq;
12     uint32_t nlmsg_pid;
13 };
14 
15 #define NLM_F_REQUEST 1
16 #define NLM_F_MULTI 2
17 #define NLM_F_ACK 4
18 
19 #define NLM_F_ROOT 0x100
20 #define NLM_F_MATCH 0x200
21 #define NLM_F_ATOMIC 0x400
22 #define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH)
23 
24 #define NLMSG_NOOP 0x1
25 #define NLMSG_ERROR 0x2
26 #define NLMSG_DONE 0x3
27 #define NLMSG_OVERRUN 0x4
28 
29 /* linux/rtnetlink.h */
30 
31 #define RTM_NEWLINK 16
32 #define RTM_GETLINK 18
33 #define RTM_NEWADDR 20
34 #define RTM_GETADDR 22
35 
36 struct rtattr {
37     unsigned short rta_len;
38     unsigned short rta_type;
39 };
40 
41 struct rtgenmsg {
42     unsigned char rtgen_family;
43 };
44 
45 struct ifinfomsg {
46     unsigned char ifi_family;
47     unsigned char __ifi_pad;
48     unsigned short ifi_type;
49     int ifi_index;
50     unsigned ifi_flags;
51     unsigned ifi_change;
52 };
53 
54 /* linux/if_link.h */
55 
56 #define IFLA_ADDRESS 1
57 #define IFLA_BROADCAST 2
58 #define IFLA_IFNAME 3
59 #define IFLA_STATS 7
60 
61 /* linux/if_addr.h */
62 
63 struct ifaddrmsg {
64     uint8_t ifa_family;
65     uint8_t ifa_prefixlen;
66     uint8_t ifa_flags;
67     uint8_t ifa_scope;
68     uint32_t ifa_index;
69 };
70 
71 #define IFA_ADDRESS 1
72 #define IFA_LOCAL 2
73 #define IFA_LABEL 3
74 #define IFA_BROADCAST 4
75 
76 /* musl */
77 
78 #define NETLINK_ALIGN(len) (((len) + 3) & ~3)
79 #define NLMSG_DATA(nlh) ((void*)((char*)(nlh) + sizeof(struct nlmsghdr)))
80 #define NLMSG_DATALEN(nlh) ((nlh)->nlmsg_len - sizeof(struct nlmsghdr))
81 #define NLMSG_DATAEND(nlh) ((char*)(nlh) + (nlh)->nlmsg_len)
82 #define NLMSG_NEXT(nlh) (struct nlmsghdr*)((char*)(nlh) + NETLINK_ALIGN((nlh)->nlmsg_len))
83 #define NLMSG_OK(nlh, end) ((char*)(end) - (char*)(nlh) >= sizeof(struct nlmsghdr))
84 
85 #define RTA_DATA(rta) ((void*)((char*)(rta) + sizeof(struct rtattr)))
86 #define RTA_DATALEN(rta) ((rta)->rta_len - sizeof(struct rtattr))
87 #define RTA_DATAEND(rta) ((char*)(rta) + (rta)->rta_len)
88 #define RTA_NEXT(rta) (struct rtattr*)((char*)(rta) + NETLINK_ALIGN((rta)->rta_len))
89 #define RTA_OK(nlh, end) ((char*)(end) - (char*)(rta) >= sizeof(struct rtattr))
90 
91 #define NLMSG_RTA(nlh, len) ((void*)((char*)(nlh) + sizeof(struct nlmsghdr) + NETLINK_ALIGN(len)))
92 #define NLMSG_RTAOK(rta, nlh) RTA_OK(rta, NLMSG_DATAEND(nlh))
93 
94 int __rtnetlink_enumerate(int link_af, int addr_af, int (*cb)(void* ctx, struct nlmsghdr* h),
95                           void* ctx);
96