189 lines
5.8 KiB
C
189 lines
5.8 KiB
C
#ifndef __LINUX_NETLINK_H
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#define __LINUX_NETLINK_H
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#include <linux/socket.h> /* for sa_family_t */
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#include <linux/types.h>
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#define NETLINK_ROUTE 0 /* Routing/device hook */
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#define NETLINK_SKIP 1 /* Reserved for ENskip */
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#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
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#define NETLINK_FIREWALL 3 /* Firewalling hook */
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#define NETLINK_TCPDIAG 4 /* TCP socket monitoring */
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#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
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#define NETLINK_XFRM 6 /* ipsec */
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#define NETLINK_SELINUX 7 /* SELinux event notifications */
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#define NETLINK_ARPD 8
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#define NETLINK_AUDIT 9 /* auditing */
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#define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */
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#define NETLINK_IP6_FW 13
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#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
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#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
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#define NETLINK_TAPBASE 16 /* 16 to 31 are ethertap */
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#define MAX_LINKS 32
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struct sockaddr_nl
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{
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sa_family_t nl_family; /* AF_NETLINK */
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unsigned short nl_pad; /* zero */
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__u32 nl_pid; /* process pid */
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__u32 nl_groups; /* multicast groups mask */
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};
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struct nlmsghdr
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{
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__u32 nlmsg_len; /* Length of message including header */
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__u16 nlmsg_type; /* Message content */
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__u16 nlmsg_flags; /* Additional flags */
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__u32 nlmsg_seq; /* Sequence number */
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__u32 nlmsg_pid; /* Sending process PID */
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};
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/* Flags values */
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#define NLM_F_REQUEST 1 /* It is request message. */
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#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
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#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
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#define NLM_F_ECHO 8 /* Echo this request */
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/* Modifiers to GET request */
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#define NLM_F_ROOT 0x100 /* specify tree root */
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#define NLM_F_MATCH 0x200 /* return all matching */
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#define NLM_F_ATOMIC 0x400 /* atomic GET */
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#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
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/* Modifiers to NEW request */
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#define NLM_F_REPLACE 0x100 /* Override existing */
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#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
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#define NLM_F_CREATE 0x400 /* Create, if it does not exist */
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#define NLM_F_APPEND 0x800 /* Add to end of list */
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/*
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4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
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4.4BSD CHANGE NLM_F_REPLACE
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True CHANGE NLM_F_CREATE|NLM_F_REPLACE
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Append NLM_F_CREATE
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Check NLM_F_EXCL
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*/
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#define NLMSG_ALIGNTO 4
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#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
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#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr)))
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#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
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#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
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#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
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(struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
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#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
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(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
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(nlh)->nlmsg_len <= (len))
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#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
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#define NLMSG_NOOP 0x1 /* Nothing. */
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#define NLMSG_ERROR 0x2 /* Error */
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#define NLMSG_DONE 0x3 /* End of a dump */
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#define NLMSG_OVERRUN 0x4 /* Data lost */
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struct nlmsgerr
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{
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int error;
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struct nlmsghdr msg;
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};
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#define NET_MAJOR 36 /* Major 36 is reserved for networking */
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enum {
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NETLINK_UNCONNECTED = 0,
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NETLINK_CONNECTED,
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};
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#ifdef __KERNEL__
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#include <linux/capability.h>
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#include <linux/skbuff.h>
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struct netlink_skb_parms
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{
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struct ucred creds; /* Skb credentials */
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__u32 pid;
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__u32 groups;
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__u32 dst_pid;
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__u32 dst_groups;
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kernel_cap_t eff_cap;
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};
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#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
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#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
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extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len));
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extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
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extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
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extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
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__u32 group, int allocation);
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extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
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extern int netlink_register_notifier(struct notifier_block *nb);
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extern int netlink_unregister_notifier(struct notifier_block *nb);
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/* finegrained unicast helpers: */
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struct sock *netlink_getsockbyfilp(struct file *filp);
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int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo);
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void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
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int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
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/*
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* skb should fit one page. This choice is good for headerless malloc.
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*/
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#define NLMSG_GOODORDER 0
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#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
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struct netlink_callback
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{
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struct sk_buff *skb;
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struct nlmsghdr *nlh;
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int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
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int (*done)(struct netlink_callback *cb);
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int family;
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long args[4];
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};
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struct netlink_notify
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{
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int pid;
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int protocol;
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};
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static __inline__ struct nlmsghdr *
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__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len)
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{
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struct nlmsghdr *nlh;
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int size = NLMSG_LENGTH(len);
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nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
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nlh->nlmsg_type = type;
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nlh->nlmsg_len = size;
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nlh->nlmsg_flags = 0;
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nlh->nlmsg_pid = pid;
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nlh->nlmsg_seq = seq;
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return nlh;
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}
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#define NLMSG_PUT(skb, pid, seq, type, len) \
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({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \
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__nlmsg_put(skb, pid, seq, type, len); })
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extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
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struct nlmsghdr *nlh,
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int (*dump)(struct sk_buff *skb, struct netlink_callback*),
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int (*done)(struct netlink_callback*));
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#define NL_NONROOT_RECV 0x1
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#define NL_NONROOT_SEND 0x2
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extern void netlink_set_nonroot(int protocol, unsigned flag);
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#endif /* __KERNEL__ */
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#endif /* __LINUX_NETLINK_H */
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