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TOMOYO Linux Cross Reference
Linux/include/linux/netlink.h

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  1 #ifndef __LINUX_NETLINK_H
  2 #define __LINUX_NETLINK_H
  3 
  4 
  5 #include <linux/capability.h>
  6 #include <linux/skbuff.h>
  7 #include <linux/export.h>
  8 #include <net/scm.h>
  9 #include <uapi/linux/netlink.h>
 10 
 11 struct net;
 12 
 13 static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb)
 14 {
 15         return (struct nlmsghdr *)skb->data;
 16 }
 17 
 18 enum netlink_skb_flags {
 19         NETLINK_SKB_MMAPED      = 0x1,  /* Packet data is mmaped */
 20         NETLINK_SKB_TX          = 0x2,  /* Packet was sent by userspace */
 21         NETLINK_SKB_DELIVERED   = 0x4,  /* Packet was delivered */
 22         NETLINK_SKB_DST         = 0x8,  /* Dst set in sendto or sendmsg */
 23 };
 24 
 25 struct netlink_skb_parms {
 26         struct scm_creds        creds;          /* Skb credentials      */
 27         __u32                   portid;
 28         __u32                   dst_group;
 29         __u32                   flags;
 30         struct sock             *sk;
 31         bool                    nsid_is_set;
 32         int                     nsid;
 33 };
 34 
 35 #define NETLINK_CB(skb)         (*(struct netlink_skb_parms*)&((skb)->cb))
 36 #define NETLINK_CREDS(skb)      (&NETLINK_CB((skb)).creds)
 37 
 38 
 39 extern void netlink_table_grab(void);
 40 extern void netlink_table_ungrab(void);
 41 
 42 #define NL_CFG_F_NONROOT_RECV   (1 << 0)
 43 #define NL_CFG_F_NONROOT_SEND   (1 << 1)
 44 
 45 /* optional Netlink kernel configuration parameters */
 46 struct netlink_kernel_cfg {
 47         unsigned int    groups;
 48         unsigned int    flags;
 49         void            (*input)(struct sk_buff *skb);
 50         struct mutex    *cb_mutex;
 51         int             (*bind)(struct net *net, int group);
 52         void            (*unbind)(struct net *net, int group);
 53         bool            (*compare)(struct net *net, struct sock *sk);
 54 };
 55 
 56 extern struct sock *__netlink_kernel_create(struct net *net, int unit,
 57                                             struct module *module,
 58                                             struct netlink_kernel_cfg *cfg);
 59 static inline struct sock *
 60 netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg)
 61 {
 62         return __netlink_kernel_create(net, unit, THIS_MODULE, cfg);
 63 }
 64 
 65 extern void netlink_kernel_release(struct sock *sk);
 66 extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
 67 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
 68 extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
 69 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
 70 extern int netlink_has_listeners(struct sock *sk, unsigned int group);
 71 
 72 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock);
 73 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid,
 74                              __u32 group, gfp_t allocation);
 75 extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb,
 76         __u32 portid, __u32 group, gfp_t allocation,
 77         int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
 78         void *filter_data);
 79 extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code);
 80 extern int netlink_register_notifier(struct notifier_block *nb);
 81 extern int netlink_unregister_notifier(struct notifier_block *nb);
 82 
 83 /* finegrained unicast helpers: */
 84 struct sock *netlink_getsockbyfilp(struct file *filp);
 85 int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
 86                       long *timeo, struct sock *ssk);
 87 void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
 88 int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
 89 
 90 static inline struct sk_buff *
 91 netlink_skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
 92 {
 93         struct sk_buff *nskb;
 94 
 95         nskb = skb_clone(skb, gfp_mask);
 96         if (!nskb)
 97                 return NULL;
 98 
 99         /* This is a large skb, set destructor callback to release head */
100         if (is_vmalloc_addr(skb->head))
101                 nskb->destructor = skb->destructor;
102 
103         return nskb;
104 }
105 
106 /*
107  *      skb should fit one page. This choice is good for headerless malloc.
108  *      But we should limit to 8K so that userspace does not have to
109  *      use enormous buffer sizes on recvmsg() calls just to avoid
110  *      MSG_TRUNC when PAGE_SIZE is very large.
111  */
112 #if PAGE_SIZE < 8192UL
113 #define NLMSG_GOODSIZE  SKB_WITH_OVERHEAD(PAGE_SIZE)
114 #else
115 #define NLMSG_GOODSIZE  SKB_WITH_OVERHEAD(8192UL)
116 #endif
117 
118 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
119 
120 
121 struct netlink_callback {
122         struct sk_buff          *skb;
123         const struct nlmsghdr   *nlh;
124         int                     (*start)(struct netlink_callback *);
125         int                     (*dump)(struct sk_buff * skb,
126                                         struct netlink_callback *cb);
127         int                     (*done)(struct netlink_callback *cb);
128         void                    *data;
129         /* the module that dump function belong to */
130         struct module           *module;
131         u16                     family;
132         u16                     min_dump_alloc;
133         unsigned int            prev_seq, seq;
134         long                    args[6];
135 };
136 
137 struct netlink_notify {
138         struct net *net;
139         u32 portid;
140         int protocol;
141 };
142 
143 struct nlmsghdr *
144 __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags);
145 
146 struct netlink_dump_control {
147         int (*start)(struct netlink_callback *);
148         int (*dump)(struct sk_buff *skb, struct netlink_callback *);
149         int (*done)(struct netlink_callback *);
150         void *data;
151         struct module *module;
152         u16 min_dump_alloc;
153 };
154 
155 extern int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
156                                 const struct nlmsghdr *nlh,
157                                 struct netlink_dump_control *control);
158 static inline int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
159                                      const struct nlmsghdr *nlh,
160                                      struct netlink_dump_control *control)
161 {
162         if (!control->module)
163                 control->module = THIS_MODULE;
164 
165         return __netlink_dump_start(ssk, skb, nlh, control);
166 }
167 
168 struct netlink_tap {
169         struct net_device *dev;
170         struct module *module;
171         struct list_head list;
172 };
173 
174 extern int netlink_add_tap(struct netlink_tap *nt);
175 extern int netlink_remove_tap(struct netlink_tap *nt);
176 
177 bool __netlink_ns_capable(const struct netlink_skb_parms *nsp,
178                           struct user_namespace *ns, int cap);
179 bool netlink_ns_capable(const struct sk_buff *skb,
180                         struct user_namespace *ns, int cap);
181 bool netlink_capable(const struct sk_buff *skb, int cap);
182 bool netlink_net_capable(const struct sk_buff *skb, int cap);
183 
184 #endif  /* __LINUX_NETLINK_H */
185 

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