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Commit | Line | Data |
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6054c1eb SH |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | ||
dacc5d41 EB |
3 | #include <errno.h> |
4 | #include <string.h> | |
5 | #include <sys/types.h> | |
6 | #include <netinet/in.h> | |
7 | #include <linux/mpls.h> | |
8 | ||
9 | #include "utils.h" | |
10 | ||
11 | static const char *mpls_ntop1(const struct mpls_label *addr, char *buf, size_t buflen) | |
12 | { | |
13 | size_t destlen = buflen; | |
14 | char *dest = buf; | |
aac40403 | 15 | int count = 0; |
dacc5d41 | 16 | |
aac40403 DA |
17 | while (1) { |
18 | uint32_t entry = ntohl(addr[count++].entry); | |
dacc5d41 EB |
19 | uint32_t label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT; |
20 | int len = snprintf(dest, destlen, "%u", label); | |
21 | ||
aac40403 DA |
22 | if (len >= destlen) |
23 | break; | |
24 | ||
dacc5d41 EB |
25 | /* Is this the end? */ |
26 | if (entry & MPLS_LS_S_MASK) | |
27 | return buf; | |
28 | ||
dacc5d41 EB |
29 | dest += len; |
30 | destlen -= len; | |
31 | if (destlen) { | |
32 | *dest = '/'; | |
33 | dest++; | |
34 | destlen--; | |
35 | } | |
36 | } | |
37 | errno = -E2BIG; | |
38 | return NULL; | |
39 | } | |
40 | ||
41 | const char *mpls_ntop(int af, const void *addr, char *buf, size_t buflen) | |
42 | { | |
43 | switch(af) { | |
44 | case AF_MPLS: | |
45 | errno = 0; | |
46 | return mpls_ntop1((struct mpls_label *)addr, buf, buflen); | |
47 | default: | |
48 | errno = EAFNOSUPPORT; | |
49 | } | |
50 | ||
51 | return NULL; | |
52 | } |