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

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