| #ifndef __LINUX_NETLINK_H |
| #define __LINUX_NETLINK_H |
| |
| #include <linux/socket.h> /* for __kernel_sa_family_t */ |
| #include <linux/types.h> |
| |
| #define NETLINK_ROUTE 0 /* Routing/device hook */ |
| #define NETLINK_UNUSED 1 /* Unused number */ |
| #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ |
| #define NETLINK_FIREWALL 3 /* Firewalling hook */ |
| #define NETLINK_SOCK_DIAG 4 /* socket monitoring */ |
| #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ |
| #define NETLINK_XFRM 6 /* ipsec */ |
| #define NETLINK_SELINUX 7 /* SELinux event notifications */ |
| #define NETLINK_ISCSI 8 /* Open-iSCSI */ |
| #define NETLINK_AUDIT 9 /* auditing */ |
| #define NETLINK_FIB_LOOKUP 10 |
| #define NETLINK_CONNECTOR 11 |
| #define NETLINK_NETFILTER 12 /* netfilter subsystem */ |
| #define NETLINK_IP6_FW 13 |
| #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ |
| #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ |
| #define NETLINK_GENERIC 16 |
| /* leave room for NETLINK_DM (DM Events) */ |
| #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ |
| #define NETLINK_ECRYPTFS 19 |
| #define NETLINK_RDMA 20 |
| #define NETLINK_CRYPTO 21 /* Crypto layer */ |
| |
| #define NETLINK_INET_DIAG NETLINK_SOCK_DIAG |
| |
| #define MAX_LINKS 32 |
| |
| struct sockaddr_nl { |
| __kernel_sa_family_t nl_family; /* AF_NETLINK */ |
| unsigned short nl_pad; /* zero */ |
| __u32 nl_pid; /* port ID */ |
| __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 port ID */ |
| }; |
| |
| /* 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 */ |
| #define NLM_F_DUMP_INTR 16 /* Dump was inconsistent due to sequence change */ |
| |
| /* 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 4U |
| #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) |
| #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) |
| #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) |
| #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 */ |
| |
| #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ |
| |
| struct nlmsgerr { |
| int error; |
| struct nlmsghdr msg; |
| }; |
| |
| #define NETLINK_ADD_MEMBERSHIP 1 |
| #define NETLINK_DROP_MEMBERSHIP 2 |
| #define NETLINK_PKTINFO 3 |
| #define NETLINK_BROADCAST_ERROR 4 |
| #define NETLINK_NO_ENOBUFS 5 |
| |
| struct nl_pktinfo { |
| __u32 group; |
| }; |
| |
| #define NET_MAJOR 36 /* Major 36 is reserved for networking */ |
| |
| enum { |
| NETLINK_UNCONNECTED = 0, |
| NETLINK_CONNECTED, |
| }; |
| |
| /* |
| * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> |
| * +---------------------+- - -+- - - - - - - - - -+- - -+ |
| * | Header | Pad | Payload | Pad | |
| * | (struct nlattr) | ing | | ing | |
| * +---------------------+- - -+- - - - - - - - - -+- - -+ |
| * <-------------- nlattr->nla_len --------------> |
| */ |
| |
| struct nlattr { |
| __u16 nla_len; |
| __u16 nla_type; |
| }; |
| |
| /* |
| * nla_type (16 bits) |
| * +---+---+-------------------------------+ |
| * | N | O | Attribute Type | |
| * +---+---+-------------------------------+ |
| * N := Carries nested attributes |
| * O := Payload stored in network byte order |
| * |
| * Note: The N and O flag are mutually exclusive. |
| */ |
| #define NLA_F_NESTED (1 << 15) |
| #define NLA_F_NET_BYTEORDER (1 << 14) |
| #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) |
| |
| #define NLA_ALIGNTO 4 |
| #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) |
| #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/capability.h> |
| #include <linux/skbuff.h> |
| |
| struct net; |
| |
| static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) |
| { |
| return (struct nlmsghdr *)skb->data; |
| } |
| |
| struct netlink_skb_parms { |
| struct ucred creds; /* Skb credentials */ |
| __u32 pid; |
| __u32 dst_group; |
| }; |
| |
| #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); |
| |
| extern struct sock *netlink_kernel_create(struct net *net, |
| int unit,unsigned int groups, |
| void (*input)(struct sk_buff *skb), |
| struct mutex *cb_mutex, |
| struct module *module); |
| 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_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 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, gfp_t allocation); |
| extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, |
| __u32 pid, __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 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, |
| 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); |
| |
| /* |
| * 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); |
| u16 family; |
| u16 min_dump_alloc; |
| unsigned int prev_seq, seq; |
| long args[6]; |
| }; |
| |
| struct netlink_notify { |
| struct net *net; |
| int pid; |
| int protocol; |
| }; |
| |
| struct nlmsghdr * |
| __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags); |
| |
| #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ |
| ({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \ |
| goto nlmsg_failure; \ |
| __nlmsg_put(skb, pid, seq, type, len, flags); }) |
| |
| #define NLMSG_PUT(skb, pid, seq, type, len) \ |
| NLMSG_NEW(skb, pid, seq, type, len, 0) |
| |
| struct netlink_dump_control { |
| int (*dump)(struct sk_buff *skb, struct netlink_callback *); |
| int (*done)(struct netlink_callback*); |
| 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); |
| |
| |
| #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 */ |