libnl  3.2.28
rtnl.c
1 /*
2  * lib/route/rtnl.c Routing Netlink
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation version 2.1
7  * of the License.
8  *
9  * Copyright (c) 2003-2012 Thomas Graf <tgraf@suug.ch>
10  */
11 
12 /**
13  * @defgroup rtnl Routing Library (libnl-route)
14  * @{
15  */
16 
17 #include <netlink-private/netlink.h>
18 #include <netlink/netlink.h>
19 #include <netlink/utils.h>
20 #include <netlink/route/rtnl.h>
21 
22 /**
23  * @name Sending
24  * @{
25  */
26 
27 /**
28  * Send routing netlink request message
29  * @arg sk Netlink socket.
30  * @arg type Netlink message type.
31  * @arg family Address family.
32  * @arg flags Additional netlink message flags.
33  *
34  * Fills out a routing netlink request message and sends it out
35  * using nl_send_simple().
36  *
37  * @return 0 on success or a negative error code. Due to a bug in older
38  * version of the library, this function returned the number of bytes sent.
39  * Treat any non-negative number as success.
40  */
41 int nl_rtgen_request(struct nl_sock *sk, int type, int family, int flags)
42 {
43  int err;
44  struct rtgenmsg gmsg = {
45  .rtgen_family = family,
46  };
47 
48  err = nl_send_simple(sk, type, flags, &gmsg, sizeof(gmsg));
49 
50  return err >= 0 ? 0 : err;
51 }
52 
53 /** @} */
54 
55 /**
56  * @name Routing Type Translations
57  * @{
58  */
59 
60 static const struct trans_tbl rtntypes[] = {
61  __ADD(RTN_UNSPEC,unspec),
62  __ADD(RTN_UNICAST,unicast),
63  __ADD(RTN_LOCAL,local),
64  __ADD(RTN_BROADCAST,broadcast),
65  __ADD(RTN_ANYCAST,anycast),
66  __ADD(RTN_MULTICAST,multicast),
67  __ADD(RTN_BLACKHOLE,blackhole),
68  __ADD(RTN_UNREACHABLE,unreachable),
69  __ADD(RTN_PROHIBIT,prohibit),
70  __ADD(RTN_THROW,throw),
71  __ADD(RTN_NAT,nat),
72  __ADD(RTN_XRESOLVE,xresolve),
73 };
74 
75 char *nl_rtntype2str(int type, char *buf, size_t size)
76 {
77  return __type2str(type, buf, size, rtntypes, ARRAY_SIZE(rtntypes));
78 }
79 
80 int nl_str2rtntype(const char *name)
81 {
82  return __str2type(name, rtntypes, ARRAY_SIZE(rtntypes));
83 }
84 
85 /** @} */
86 
87 /**
88  * @name Scope Translations
89  * @{
90  */
91 
92 static const struct trans_tbl scopes[] = {
93  __ADD(255,nowhere),
94  __ADD(254,host),
95  __ADD(253,link),
96  __ADD(200,site),
97  __ADD(0,global),
98 };
99 
100 char *rtnl_scope2str(int scope, char *buf, size_t size)
101 {
102  return __type2str(scope, buf, size, scopes, ARRAY_SIZE(scopes));
103 }
104 
105 int rtnl_str2scope(const char *name)
106 {
107  return __str2type(name, scopes, ARRAY_SIZE(scopes));
108 }
109 
110 /** @} */
111 
112 /**
113  * @name Realms Translations
114  * @{
115  */
116 
117 char * rtnl_realms2str(uint32_t realms, char *buf, size_t len)
118 {
119  int from = RTNL_REALM_FROM(realms);
120  int to = RTNL_REALM_TO(realms);
121 
122  snprintf(buf, len, "%d/%d", from, to);
123 
124  return buf;
125 }
126 
127 /** @} */
128 
129 /** @} */
#define RTNL_REALM_TO(realm)
Extract TO realm from a realms field.
Definition: rtnl.h:40
#define RTNL_REALM_FROM(realm)
Extract FROM realm from a realms field.
Definition: rtnl.h:35
int nl_rtgen_request(struct nl_sock *sk, int type, int family, int flags)
Send routing netlink request message.
Definition: rtnl.c:41
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:584