diff options
Diffstat (limited to 'include/linux/netlink.h')
| -rw-r--r-- | include/linux/netlink.h | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h new file mode 100644 index 000000000..6835c1279 --- /dev/null +++ b/include/linux/netlink.h @@ -0,0 +1,181 @@ +#ifndef __LINUX_NETLINK_H +#define __LINUX_NETLINK_H + + +#include <linux/capability.h> +#include <linux/skbuff.h> +#include <linux/export.h> +#include <net/scm.h> +#include <uapi/linux/netlink.h> + +struct net; + +static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) +{ + return (struct nlmsghdr *)skb->data; +} + +enum netlink_skb_flags { + NETLINK_SKB_MMAPED = 0x1, /* Packet data is mmaped */ + NETLINK_SKB_TX = 0x2, /* Packet was sent by userspace */ + NETLINK_SKB_DELIVERED = 0x4, /* Packet was delivered */ + NETLINK_SKB_DST = 0x8, /* Dst set in sendto or sendmsg */ +}; + +struct netlink_skb_parms { + struct scm_creds creds; /* Skb credentials */ + __u32 portid; + __u32 dst_group; + __u32 flags; + struct sock *sk; +}; + +#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) +#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) + + +extern void netlink_table_grab(void); +extern void netlink_table_ungrab(void); + +#define NL_CFG_F_NONROOT_RECV (1 << 0) +#define NL_CFG_F_NONROOT_SEND (1 << 1) + +/* optional Netlink kernel configuration parameters */ +struct netlink_kernel_cfg { + unsigned int groups; + unsigned int flags; + void (*input)(struct sk_buff *skb); + struct mutex *cb_mutex; + int (*bind)(struct net *net, int group); + void (*unbind)(struct net *net, int group); + bool (*compare)(struct net *net, struct sock *sk); +}; + +extern struct sock *__netlink_kernel_create(struct net *net, int unit, + struct module *module, + struct netlink_kernel_cfg *cfg); +static inline struct sock * +netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg) +{ + return __netlink_kernel_create(net, unit, THIS_MODULE, cfg); +} + +extern void netlink_kernel_release(struct sock *sk); +extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); +extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); +extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); +extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); +extern int netlink_has_listeners(struct sock *sk, unsigned int group); +extern struct sk_buff *netlink_alloc_skb(struct sock *ssk, unsigned int size, + u32 dst_portid, gfp_t gfp_mask); +extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock); +extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid, + __u32 group, gfp_t allocation); +extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, + __u32 portid, __u32 group, gfp_t allocation, + int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), + void *filter_data); +extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code); +extern int netlink_register_notifier(struct notifier_block *nb); +extern int netlink_unregister_notifier(struct notifier_block *nb); + +/* finegrained unicast helpers: */ +struct sock *netlink_getsockbyfilp(struct file *filp); +int netlink_attachskb(struct sock *sk, struct sk_buff *skb, + long *timeo, struct sock *ssk); +void netlink_detachskb(struct sock *sk, struct sk_buff *skb); +int netlink_sendskb(struct sock *sk, struct sk_buff *skb); + +static inline struct sk_buff * +netlink_skb_clone(struct sk_buff *skb, gfp_t gfp_mask) +{ + struct sk_buff *nskb; + + nskb = skb_clone(skb, gfp_mask); + if (!nskb) + return NULL; + + /* This is a large skb, set destructor callback to release head */ + if (is_vmalloc_addr(skb->head)) + nskb->destructor = skb->destructor; + + return nskb; +} + +/* + * skb should fit one page. This choice is good for headerless malloc. + * But we should limit to 8K so that userspace does not have to + * use enormous buffer sizes on recvmsg() calls just to avoid + * MSG_TRUNC when PAGE_SIZE is very large. + */ +#if PAGE_SIZE < 8192UL +#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) +#else +#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) +#endif + +#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) + + +struct netlink_callback { + struct sk_buff *skb; + const struct nlmsghdr *nlh; + int (*dump)(struct sk_buff * skb, + struct netlink_callback *cb); + int (*done)(struct netlink_callback *cb); + void *data; + /* the module that dump function belong to */ + struct module *module; + u16 family; + u16 min_dump_alloc; + unsigned int prev_seq, seq; + long args[6]; +}; + +struct netlink_notify { + struct net *net; + u32 portid; + int protocol; +}; + +struct nlmsghdr * +__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags); + +struct netlink_dump_control { + int (*dump)(struct sk_buff *skb, struct netlink_callback *); + int (*done)(struct netlink_callback *); + void *data; + struct module *module; + u16 min_dump_alloc; +}; + +extern int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + struct netlink_dump_control *control); +static inline int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + struct netlink_dump_control *control) +{ + if (!control->module) + control->module = THIS_MODULE; + + return __netlink_dump_start(ssk, skb, nlh, control); +} + +struct netlink_tap { + struct net_device *dev; + struct module *module; + struct list_head list; +}; + +extern int netlink_add_tap(struct netlink_tap *nt); +extern int netlink_remove_tap(struct netlink_tap *nt); + +bool __netlink_ns_capable(const struct netlink_skb_parms *nsp, + struct user_namespace *ns, int cap); +bool netlink_ns_capable(const struct sk_buff *skb, + struct user_namespace *ns, int cap); +bool netlink_capable(const struct sk_buff *skb, int cap); +bool netlink_net_capable(const struct sk_buff *skb, int cap); + +#endif /* __LINUX_NETLINK_H */ |