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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14struct genl_multicast_group {
15 char name[GENL_NAMSIZ];
16};
17
18struct genl_ops;
19struct genl_info;
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42struct genl_family {
43 unsigned int id;
44 unsigned int hdrsize;
45 char name[GENL_NAMSIZ];
46 unsigned int version;
47 unsigned int maxattr;
48 bool netnsok;
49 bool parallel_ops;
50 int (*pre_doit)(const struct genl_ops *ops,
51 struct sk_buff *skb,
52 struct genl_info *info);
53 void (*post_doit)(const struct genl_ops *ops,
54 struct sk_buff *skb,
55 struct genl_info *info);
56 struct nlattr ** attrbuf;
57 const struct genl_ops * ops;
58 const struct genl_multicast_group *mcgrps;
59 unsigned int n_ops;
60 unsigned int n_mcgrps;
61 unsigned int mcgrp_offset;
62 struct list_head family_list;
63 struct module *module;
64};
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78struct genl_info {
79 u32 snd_seq;
80 u32 snd_portid;
81 struct nlmsghdr * nlhdr;
82 struct genlmsghdr * genlhdr;
83 void * userhdr;
84 struct nlattr ** attrs;
85#ifdef CONFIG_NET_NS
86 struct net * _net;
87#endif
88 void * user_ptr[2];
89 struct sock * dst_sk;
90};
91
92static inline struct net *genl_info_net(struct genl_info *info)
93{
94 return read_pnet(&info->_net);
95}
96
97static inline void genl_info_net_set(struct genl_info *info, struct net *net)
98{
99 write_pnet(&info->_net, net);
100}
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113struct genl_ops {
114 const struct nla_policy *policy;
115 int (*doit)(struct sk_buff *skb,
116 struct genl_info *info);
117 int (*dumpit)(struct sk_buff *skb,
118 struct netlink_callback *cb);
119 int (*done)(struct netlink_callback *cb);
120 u8 cmd;
121 u8 internal_flags;
122 u8 flags;
123};
124
125int __genl_register_family(struct genl_family *family);
126
127static inline int genl_register_family(struct genl_family *family)
128{
129 family->module = THIS_MODULE;
130 return __genl_register_family(family);
131}
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154static inline int
155_genl_register_family_with_ops_grps(struct genl_family *family,
156 const struct genl_ops *ops, size_t n_ops,
157 const struct genl_multicast_group *mcgrps,
158 size_t n_mcgrps)
159{
160 family->module = THIS_MODULE;
161 family->ops = ops;
162 family->n_ops = n_ops;
163 family->mcgrps = mcgrps;
164 family->n_mcgrps = n_mcgrps;
165 return __genl_register_family(family);
166}
167
168#define genl_register_family_with_ops(family, ops) \
169 _genl_register_family_with_ops_grps((family), \
170 (ops), ARRAY_SIZE(ops), \
171 NULL, 0)
172#define genl_register_family_with_ops_groups(family, ops, grps) \
173 _genl_register_family_with_ops_grps((family), \
174 (ops), ARRAY_SIZE(ops), \
175 (grps), ARRAY_SIZE(grps))
176
177int genl_unregister_family(struct genl_family *family);
178void genl_notify(struct genl_family *family,
179 struct sk_buff *skb, struct net *net, u32 portid,
180 u32 group, struct nlmsghdr *nlh, gfp_t flags);
181
182struct sk_buff *genlmsg_new_unicast(size_t payload, struct genl_info *info,
183 gfp_t flags);
184void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
185 struct genl_family *family, int flags, u8 cmd);
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194static inline struct nlmsghdr *genlmsg_nlhdr(void *user_hdr,
195 struct genl_family *family)
196{
197 return (struct nlmsghdr *)((char *)user_hdr -
198 family->hdrsize -
199 GENL_HDRLEN -
200 NLMSG_HDRLEN);
201}
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212static inline void genl_dump_check_consistent(struct netlink_callback *cb,
213 void *user_hdr,
214 struct genl_family *family)
215{
216 nl_dump_check_consistent(cb, genlmsg_nlhdr(user_hdr, family));
217}
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229static inline void *genlmsg_put_reply(struct sk_buff *skb,
230 struct genl_info *info,
231 struct genl_family *family,
232 int flags, u8 cmd)
233{
234 return genlmsg_put(skb, info->snd_portid, info->snd_seq, family,
235 flags, cmd);
236}
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243static inline int genlmsg_end(struct sk_buff *skb, void *hdr)
244{
245 return nlmsg_end(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
246}
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253static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr)
254{
255 if (hdr)
256 nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
257}
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268static inline int genlmsg_multicast_netns(struct genl_family *family,
269 struct net *net, struct sk_buff *skb,
270 u32 portid, unsigned int group, gfp_t flags)
271{
272 if (WARN_ON_ONCE(group >= family->n_mcgrps))
273 return -EINVAL;
274 group = family->mcgrp_offset + group;
275 return nlmsg_multicast(net->genl_sock, skb, portid, group, flags);
276}
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286static inline int genlmsg_multicast(struct genl_family *family,
287 struct sk_buff *skb, u32 portid,
288 unsigned int group, gfp_t flags)
289{
290 return genlmsg_multicast_netns(family, &init_net, skb,
291 portid, group, flags);
292}
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304int genlmsg_multicast_allns(struct genl_family *family,
305 struct sk_buff *skb, u32 portid,
306 unsigned int group, gfp_t flags);
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313static inline int genlmsg_unicast(struct net *net, struct sk_buff *skb, u32 portid)
314{
315 return nlmsg_unicast(net->genl_sock, skb, portid);
316}
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323static inline int genlmsg_reply(struct sk_buff *skb, struct genl_info *info)
324{
325 return genlmsg_unicast(genl_info_net(info), skb, info->snd_portid);
326}
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332static inline void *genlmsg_data(const struct genlmsghdr *gnlh)
333{
334 return ((unsigned char *) gnlh + GENL_HDRLEN);
335}
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341static inline int genlmsg_len(const struct genlmsghdr *gnlh)
342{
343 struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh -
344 NLMSG_HDRLEN);
345 return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
346}
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352static inline int genlmsg_msg_size(int payload)
353{
354 return GENL_HDRLEN + payload;
355}
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361static inline int genlmsg_total_size(int payload)
362{
363 return NLMSG_ALIGN(genlmsg_msg_size(payload));
364}
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371static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags)
372{
373 return nlmsg_new(genlmsg_total_size(payload), flags);
374}
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388static inline int genl_set_err(struct genl_family *family, struct net *net,
389 u32 portid, u32 group, int code)
390{
391 if (WARN_ON_ONCE(group >= family->n_mcgrps))
392 return -EINVAL;
393 group = family->mcgrp_offset + group;
394 return netlink_set_err(net->genl_sock, portid, group, code);
395}
396
397#endif
398