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9f2e8c9e BP |
1 | /* -*- c -*- */ |
2 | ||
3 | #include <net/genetlink.h> | |
4 | #include <linux/version.h> | |
5 | ||
6 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
7 | #include <linux/mutex.h> | |
8 | ||
9 | static DEFINE_MUTEX(mc_group_mutex); | |
10 | ||
11 | int genl_register_mc_group(struct genl_family *family, | |
12 | struct genl_multicast_group *grp) | |
13 | { | |
14 | static int next_group = GENL_FIRST_MCGROUP; | |
15 | ||
16 | mutex_lock(&mc_group_mutex); | |
17 | grp->id = next_group; | |
18 | grp->family = family; | |
19 | ||
20 | if (++next_group > GENL_LAST_MCGROUP) | |
21 | next_group = GENL_FIRST_MCGROUP; | |
22 | mutex_unlock(&mc_group_mutex); | |
23 | ||
24 | return 0; | |
25 | } | |
26 | #endif /* kernel < 2.6.23 */ | |
e2c779b3 BP |
27 | |
28 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31) | |
29 | /** | |
30 | * genl_register_family_with_ops - register a generic netlink family | |
31 | * @family: generic netlink family | |
32 | * @ops: operations to be registered | |
33 | * @n_ops: number of elements to register | |
34 | * | |
35 | * Registers the specified family and operations from the specified table. | |
36 | * Only one family may be registered with the same family name or identifier. | |
37 | * | |
38 | * The family id may equal GENL_ID_GENERATE causing an unique id to | |
39 | * be automatically generated and assigned. | |
40 | * | |
41 | * Either a doit or dumpit callback must be specified for every registered | |
42 | * operation or the function will fail. Only one operation structure per | |
43 | * command identifier may be registered. | |
44 | * | |
45 | * See include/net/genetlink.h for more documenation on the operations | |
46 | * structure. | |
47 | * | |
48 | * This is equivalent to calling genl_register_family() followed by | |
49 | * genl_register_ops() for every operation entry in the table taking | |
50 | * care to unregister the family on error path. | |
51 | * | |
52 | * Return 0 on success or a negative error code. | |
53 | */ | |
54 | int genl_register_family_with_ops(struct genl_family *family, | |
55 | struct genl_ops *ops, size_t n_ops) | |
56 | { | |
57 | int err, i; | |
58 | ||
59 | err = genl_register_family(family); | |
60 | if (err) | |
61 | return err; | |
62 | ||
63 | for (i = 0; i < n_ops; ++i, ++ops) { | |
64 | err = genl_register_ops(family, ops); | |
65 | if (err) | |
66 | goto err_out; | |
67 | } | |
68 | return 0; | |
69 | err_out: | |
70 | genl_unregister_family(family); | |
71 | return err; | |
72 | } | |
73 | #endif | |
982b8810 | 74 | |
aaff4b55 BP |
75 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) |
76 | /** | |
77 | * nlmsg_notify - send a notification netlink message | |
78 | * @sk: netlink socket to use | |
79 | * @skb: notification message | |
80 | * @pid: destination netlink pid for reports or 0 | |
81 | * @group: destination multicast group or 0 | |
82 | * @report: 1 to report back, 0 to disable | |
83 | * @flags: allocation flags | |
84 | */ | |
85 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 pid, | |
86 | unsigned int group, int report, gfp_t flags) | |
87 | { | |
88 | int err = 0; | |
89 | ||
90 | if (group) { | |
91 | int exclude_pid = 0; | |
92 | ||
93 | if (report) { | |
94 | atomic_inc(&skb->users); | |
95 | exclude_pid = pid; | |
96 | } | |
97 | ||
98 | /* errors reported via destination sk->sk_err, but propagate | |
99 | * delivery errors if NETLINK_BROADCAST_ERROR flag is set */ | |
100 | err = nlmsg_multicast(sk, skb, exclude_pid, group, flags); | |
101 | } | |
102 | ||
103 | if (report) { | |
104 | int err2; | |
105 | ||
106 | err2 = nlmsg_unicast(sk, skb, pid); | |
107 | if (!err || err == -ESRCH) | |
108 | err = err2; | |
109 | } | |
110 | ||
111 | return err; | |
112 | } | |
113 | #endif | |
114 | ||
115 | /* This is analogous to rtnl_notify() but uses genl_sock instead of rtnl. | |
116 | * | |
117 | * This is not (yet) in any upstream kernel. */ | |
118 | void genl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, | |
119 | struct nlmsghdr *nlh, gfp_t flags) | |
120 | { | |
121 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32) | |
122 | struct sock *sk = net->genl_sock; | |
123 | #else | |
124 | struct sock *sk = genl_sock; | |
125 | #endif | |
126 | int report = 0; | |
127 | ||
128 | if (nlh) | |
129 | report = nlmsg_report(nlh); | |
130 | ||
131 | nlmsg_notify(sk, skb, pid, group, report, flags); | |
132 | } | |
133 | ||
982b8810 BP |
134 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30) |
135 | /* This function wasn't exported before 2.6.30. Lose! */ | |
136 | void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code) | |
137 | { | |
138 | } | |
139 | #endif |