diff options
Diffstat (limited to 'include/linux/netlink.h')
| -rw-r--r-- | include/linux/netlink.h | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h new file mode 100644 index 00000000000..f731abdc1a2 --- /dev/null +++ b/include/linux/netlink.h @@ -0,0 +1,188 @@ +#ifndef __LINUX_NETLINK_H +#define __LINUX_NETLINK_H + +#include <linux/socket.h> /* for sa_family_t */ +#include <linux/types.h> + +#define NETLINK_ROUTE 0 /* Routing/device hook */ +#define NETLINK_SKIP 1 /* Reserved for ENskip */ +#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ +#define NETLINK_FIREWALL 3 /* Firewalling hook */ +#define NETLINK_TCPDIAG 4 /* TCP socket monitoring */ +#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ +#define NETLINK_XFRM 6 /* ipsec */ +#define NETLINK_SELINUX 7 /* SELinux event notifications */ +#define NETLINK_ARPD 8 +#define NETLINK_AUDIT 9 /* auditing */ +#define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */ +#define NETLINK_IP6_FW 13 +#define NETLINK_DNRTMSG 14 /* DECnet routing messages */ +#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ +#define NETLINK_TAPBASE 16 /* 16 to 31 are ethertap */ + +#define MAX_LINKS 32 + +struct sockaddr_nl +{ + sa_family_t nl_family; /* AF_NETLINK */ + unsigned short nl_pad; /* zero */ + __u32 nl_pid; /* process pid */ + __u32 nl_groups; /* multicast groups mask */ +}; + +struct nlmsghdr +{ + __u32 nlmsg_len; /* Length of message including header */ + __u16 nlmsg_type; /* Message content */ + __u16 nlmsg_flags; /* Additional flags */ + __u32 nlmsg_seq; /* Sequence number */ + __u32 nlmsg_pid; /* Sending process PID */ +}; + +/* Flags values */ + +#define NLM_F_REQUEST 1 /* It is request message. */ +#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ +#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ +#define NLM_F_ECHO 8 /* Echo this request */ + +/* Modifiers to GET request */ +#define NLM_F_ROOT 0x100 /* specify tree root */ +#define NLM_F_MATCH 0x200 /* return all matching */ +#define NLM_F_ATOMIC 0x400 /* atomic GET */ +#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) + +/* Modifiers to NEW request */ +#define NLM_F_REPLACE 0x100 /* Override existing */ +#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ +#define NLM_F_CREATE 0x400 /* Create, if it does not exist */ +#define NLM_F_APPEND 0x800 /* Add to end of list */ + +/* + 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL + 4.4BSD CHANGE NLM_F_REPLACE + + True CHANGE NLM_F_CREATE|NLM_F_REPLACE + Append NLM_F_CREATE + Check NLM_F_EXCL + */ + +#define NLMSG_ALIGNTO 4 +#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) +#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr))) +#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) +#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) +#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ + (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) +#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ + (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ + (nlh)->nlmsg_len <= (len)) +#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) + +#define NLMSG_NOOP 0x1 /* Nothing. */ +#define NLMSG_ERROR 0x2 /* Error */ +#define NLMSG_DONE 0x3 /* End of a dump */ +#define NLMSG_OVERRUN 0x4 /* Data lost */ + +struct nlmsgerr +{ + int error; + struct nlmsghdr msg; +}; + +#define NET_MAJOR 36 /* Major 36 is reserved for networking */ + +enum { + NETLINK_UNCONNECTED = 0, + NETLINK_CONNECTED, +}; + +#ifdef __KERNEL__ + +#include <linux/capability.h> +#include <linux/skbuff.h> + +struct netlink_skb_parms +{ + struct ucred creds; /* Skb credentials */ + __u32 pid; + __u32 groups; + __u32 dst_pid; + __u32 dst_groups; + kernel_cap_t eff_cap; +}; + +#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) +#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) + + +extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len)); +extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); +extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); +extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, + __u32 group, int allocation); +extern void netlink_set_err(struct sock *ssk, __u32 pid, __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, int nonblock, long timeo); +void netlink_detachskb(struct sock *sk, struct sk_buff *skb); +int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol); + +/* + * skb should fit one page. This choice is good for headerless malloc. + */ +#define NLMSG_GOODORDER 0 +#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER)) + + +struct netlink_callback +{ + struct sk_buff *skb; + struct nlmsghdr *nlh; + int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); + int (*done)(struct netlink_callback *cb); + int family; + long args[4]; +}; + +struct netlink_notify +{ + int pid; + int protocol; +}; + +static __inline__ struct nlmsghdr * +__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len) +{ + struct nlmsghdr *nlh; + int size = NLMSG_LENGTH(len); + + nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); + nlh->nlmsg_type = type; + nlh->nlmsg_len = size; + nlh->nlmsg_flags = 0; + nlh->nlmsg_pid = pid; + nlh->nlmsg_seq = seq; + return nlh; +} + +#define NLMSG_PUT(skb, pid, seq, type, len) \ +({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \ + __nlmsg_put(skb, pid, seq, type, len); }) + +extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, + struct nlmsghdr *nlh, + int (*dump)(struct sk_buff *skb, struct netlink_callback*), + int (*done)(struct netlink_callback*)); + + +#define NL_NONROOT_RECV 0x1 +#define NL_NONROOT_SEND 0x2 +extern void netlink_set_nonroot(int protocol, unsigned flag); + +#endif /* __KERNEL__ */ + +#endif /* __LINUX_NETLINK_H */ |