1#ifndef __NET_GENERIC_NETLINK_H
2#define __NET_GENERIC_NETLINK_H
3
4#include <linux/genetlink.h>
5#include <net/netlink.h>
6#include <net/net_namespace.h>
7
8#define GENLMSG_DEFAULT_SIZE (NLMSG_DEFAULT_SIZE - GENL_HDRLEN)
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18struct genl_multicast_group {
19 struct genl_family *family;
20 struct list_head list;
21 char name[GENL_NAMSIZ];
22 u32 id;
23};
24
25struct genl_ops;
26struct genl_info;
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46struct genl_family {
47 unsigned int id;
48 unsigned int hdrsize;
49 char name[GENL_NAMSIZ];
50 unsigned int version;
51 unsigned int maxattr;
52 bool netnsok;
53 bool parallel_ops;
54 int (*pre_doit)(struct genl_ops *ops,
55 struct sk_buff *skb,
56 struct genl_info *info);
57 void (*post_doit)(struct genl_ops *ops,
58 struct sk_buff *skb,
59 struct genl_info *info);
60 struct nlattr ** attrbuf;
61 struct list_head ops_list;
62 struct list_head family_list;
63 struct list_head mcast_groups;
64};
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77struct genl_info {
78 u32 snd_seq;
79 u32 snd_portid;
80 struct nlmsghdr * nlhdr;
81 struct genlmsghdr * genlhdr;
82 void * userhdr;
83 struct nlattr ** attrs;
84#ifdef CONFIG_NET_NS
85 struct net * _net;
86#endif
87 void * user_ptr[2];
88};
89
90static inline struct net *genl_info_net(struct genl_info *info)
91{
92 return read_pnet(&info->_net);
93}
94
95static inline void genl_info_net_set(struct genl_info *info, struct net *net)
96{
97 write_pnet(&info->_net, net);
98}
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111struct genl_ops {
112 u8 cmd;
113 u8 internal_flags;
114 unsigned int flags;
115 const struct nla_policy *policy;
116 int (*doit)(struct sk_buff *skb,
117 struct genl_info *info);
118 int (*dumpit)(struct sk_buff *skb,
119 struct netlink_callback *cb);
120 int (*done)(struct netlink_callback *cb);
121 struct list_head ops_list;
122};
123
124extern int genl_register_family(struct genl_family *family);
125extern int genl_register_family_with_ops(struct genl_family *family,
126 struct genl_ops *ops, size_t n_ops);
127extern int genl_unregister_family(struct genl_family *family);
128extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);
129extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);
130extern int genl_register_mc_group(struct genl_family *family,
131 struct genl_multicast_group *grp);
132extern void genl_unregister_mc_group(struct genl_family *family,
133 struct genl_multicast_group *grp);
134extern void genl_notify(struct sk_buff *skb, struct net *net, u32 portid,
135 u32 group, struct nlmsghdr *nlh, gfp_t flags);
136
137void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
138 struct genl_family *family, int flags, u8 cmd);
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147static inline struct nlmsghdr *genlmsg_nlhdr(void *user_hdr,
148 struct genl_family *family)
149{
150 return (struct nlmsghdr *)((char *)user_hdr -
151 family->hdrsize -
152 GENL_HDRLEN -
153 NLMSG_HDRLEN);
154}
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165static inline void genl_dump_check_consistent(struct netlink_callback *cb,
166 void *user_hdr,
167 struct genl_family *family)
168{
169 nl_dump_check_consistent(cb, genlmsg_nlhdr(user_hdr, family));
170}
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182static inline void *genlmsg_put_reply(struct sk_buff *skb,
183 struct genl_info *info,
184 struct genl_family *family,
185 int flags, u8 cmd)
186{
187 return genlmsg_put(skb, info->snd_portid, info->snd_seq, family,
188 flags, cmd);
189}
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196static inline int genlmsg_end(struct sk_buff *skb, void *hdr)
197{
198 return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
199}
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206static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr)
207{
208 if (hdr)
209 nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
210}
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220static inline int genlmsg_multicast_netns(struct net *net, struct sk_buff *skb,
221 u32 portid, unsigned int group, gfp_t flags)
222{
223 return nlmsg_multicast(net->genl_sock, skb, portid, group, flags);
224}
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233static inline int genlmsg_multicast(struct sk_buff *skb, u32 portid,
234 unsigned int group, gfp_t flags)
235{
236 return genlmsg_multicast_netns(&init_net, skb, portid, group, flags);
237}
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248int genlmsg_multicast_allns(struct sk_buff *skb, u32 portid,
249 unsigned int group, gfp_t flags);
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256static inline int genlmsg_unicast(struct net *net, struct sk_buff *skb, u32 portid)
257{
258 return nlmsg_unicast(net->genl_sock, skb, portid);
259}
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266static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info)
267{
268 return genlmsg_unicast(genl_info_net(info), skb, info->snd_portid);
269}
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275static inline void *genlmsg_data(const struct genlmsghdr *gnlh)
276{
277 return ((unsigned char *) gnlh + GENL_HDRLEN);
278}
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284static inline int genlmsg_len(const struct genlmsghdr *gnlh)
285{
286 struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh -
287 NLMSG_HDRLEN);
288 return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
289}
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295static inline int genlmsg_msg_size(int payload)
296{
297 return GENL_HDRLEN + payload;
298}
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304static inline int genlmsg_total_size(int payload)
305{
306 return NLMSG_ALIGN(genlmsg_msg_size(payload));
307}
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314static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags)
315{
316 return nlmsg_new(genlmsg_total_size(payload), flags);
317}
318
319
320#endif
321