libnl  3.7.0
rtnl.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3  * Copyright (c) 2003-2012 Thomas Graf <tgraf@suug.ch>
4  */
5 
6 /**
7  * @defgroup rtnl Routing Library (libnl-route)
8  * @{
9  */
10 
11 #include <netlink-private/netlink.h>
12 #include <netlink/netlink.h>
13 #include <netlink/utils.h>
14 #include <netlink/route/rtnl.h>
15 
16 /**
17  * @name Sending
18  * @{
19  */
20 
21 /**
22  * Send routing netlink request message
23  * @arg sk Netlink socket.
24  * @arg type Netlink message type.
25  * @arg family Address family.
26  * @arg flags Additional netlink message flags.
27  *
28  * Fills out a routing netlink request message and sends it out
29  * using nl_send_simple().
30  *
31  * @return 0 on success or a negative error code. Due to a bug in older
32  * version of the library, this function returned the number of bytes sent.
33  * Treat any non-negative number as success.
34  */
35 int nl_rtgen_request(struct nl_sock *sk, int type, int family, int flags)
36 {
37  int err;
38  struct rtgenmsg gmsg = {
39  .rtgen_family = family,
40  };
41 
42  err = nl_send_simple(sk, type, flags, &gmsg, sizeof(gmsg));
43 
44  return err >= 0 ? 0 : err;
45 }
46 
47 /** @} */
48 
49 /**
50  * @name Routing Type Translations
51  * @{
52  */
53 
54 static const struct trans_tbl rtntypes[] = {
55  __ADD(RTN_UNSPEC,unspec),
56  __ADD(RTN_UNICAST,unicast),
57  __ADD(RTN_LOCAL,local),
58  __ADD(RTN_BROADCAST,broadcast),
59  __ADD(RTN_ANYCAST,anycast),
60  __ADD(RTN_MULTICAST,multicast),
61  __ADD(RTN_BLACKHOLE,blackhole),
62  __ADD(RTN_UNREACHABLE,unreachable),
63  __ADD(RTN_PROHIBIT,prohibit),
64  __ADD(RTN_THROW,throw),
65  __ADD(RTN_NAT,nat),
66  __ADD(RTN_XRESOLVE,xresolve),
67 };
68 
69 char *nl_rtntype2str(int type, char *buf, size_t size)
70 {
71  return __type2str(type, buf, size, rtntypes, ARRAY_SIZE(rtntypes));
72 }
73 
74 int nl_str2rtntype(const char *name)
75 {
76  return __str2type(name, rtntypes, ARRAY_SIZE(rtntypes));
77 }
78 
79 /** @} */
80 
81 /**
82  * @name Scope Translations
83  * @{
84  */
85 
86 static const struct trans_tbl scopes[] = {
87  __ADD(255,nowhere),
88  __ADD(254,host),
89  __ADD(253,link),
90  __ADD(200,site),
91  __ADD(0,global),
92 };
93 
94 char *rtnl_scope2str(int scope, char *buf, size_t size)
95 {
96  return __type2str(scope, buf, size, scopes, ARRAY_SIZE(scopes));
97 }
98 
99 int rtnl_str2scope(const char *name)
100 {
101  return __str2type(name, scopes, ARRAY_SIZE(scopes));
102 }
103 
104 /** @} */
105 
106 /**
107  * @name Realms Translations
108  * @{
109  */
110 
111 char * rtnl_realms2str(uint32_t realms, char *buf, size_t len)
112 {
113  int from = RTNL_REALM_FROM(realms);
114  int to = RTNL_REALM_TO(realms);
115 
116  snprintf(buf, len, "%d/%d", from, to);
117 
118  return buf;
119 }
120 
121 /** @} */
122 
123 /** @} */
#define RTNL_REALM_TO(realm)
Extract TO realm from a realms field.
Definition: rtnl.h:34
int nl_rtgen_request(struct nl_sock *sk, int type, int family, int flags)
Send routing netlink request message.
Definition: rtnl.c:35
#define RTNL_REALM_FROM(realm)
Extract FROM realm from a realms field.
Definition: rtnl.h:29
int nl_send_simple(struct nl_sock *sk, int type, int flags, void *buf, size_t size)
Construct and transmit a Netlink message.
Definition: nl.c:574