1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
// SPDX-License-Identifier: ISC
/*
* Copyright (c) 2007, 2008 Johannes Berg
* Copyright (c) 2007 Andy Lutomirski
* Copyright (c) 2007 Mike Kershaw
* Copyright (c) 2008-2009 Luis R. Rodriguez
*/
/*
* This ought to be provided by libnl - but was borrowed from iw/genl.c
*/
#include "netlink.h"
#include "main.h"
#include <errno.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netlink/msg.h>
#include <netlink/attr.h>
#include <linux/genetlink.h>
#include "batman_adv.h"
static int mcast_error_handler(struct sockaddr_nl *nla __maybe_unused,
struct nlmsgerr *err, void *arg)
{
int *ret = arg;
*ret = err->error;
return NL_STOP;
}
static int mcast_ack_handler(struct nl_msg *msg __maybe_unused, void *arg)
{
int *ret = arg;
*ret = 0;
return NL_STOP;
}
struct mcast_handler_args {
const char *group;
int id;
};
static int mcast_family_handler(struct nl_msg *msg, void *arg)
{
struct mcast_handler_args *grp = arg;
struct nlattr *tb[CTRL_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *mcgrp;
int rem_mcgrp;
nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[CTRL_ATTR_MCAST_GROUPS])
return NL_SKIP;
nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) {
struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1];
nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX,
nla_data(mcgrp), nla_len(mcgrp), NULL);
if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] ||
!tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID])
continue;
if (strncmp(nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]),
grp->group, nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME])))
continue;
grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]);
break;
}
return NL_SKIP;
}
int nl_get_multicast_id(struct nl_sock *sock, const char *family,
const char *group)
{
struct mcast_handler_args grp = {
.group = group,
.id = -ENOENT,
};
struct nl_msg *msg;
struct nl_cb *cb;
int ctrlid;
int ret;
msg = nlmsg_alloc();
if (!msg)
return -ENOMEM;
cb = nl_cb_alloc(NL_CB_DEFAULT);
if (!cb) {
ret = -ENOMEM;
goto out_fail_cb;
}
ctrlid = genl_ctrl_resolve(sock, "nlctrl");
genlmsg_put(msg, 0, 0, ctrlid, 0,
0, CTRL_CMD_GETFAMILY, 0);
ret = -ENOBUFS;
NLA_PUT_STRING(msg, CTRL_ATTR_FAMILY_NAME, family);
ret = nl_send_auto_complete(sock, msg);
if (ret < 0)
goto out;
ret = 1;
nl_cb_err(cb, NL_CB_CUSTOM, mcast_error_handler, &ret);
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, mcast_ack_handler, &ret);
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, mcast_family_handler, &grp);
while (ret > 0)
nl_recvmsgs(sock, cb);
if (ret == 0)
ret = grp.id;
nla_put_failure:
out:
nl_cb_put(cb);
out_fail_cb:
nlmsg_free(msg);
return ret;
}
|
