diff options
Diffstat (limited to 'include/linux/netlink.h')
| -rw-r--r-- | include/linux/netlink.h | 174 |
1 files changed, 164 insertions, 10 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h index 711687af8..8766af2b4 100644 --- a/include/linux/netlink.h +++ b/include/linux/netlink.h @@ -1,20 +1,174 @@ #ifndef __LINUX_NETLINK_H #define __LINUX_NETLINK_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_ARPD 8 +#define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */ +#define NETLINK_IP6_FW 13 +#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 */ + __kernel_pid_t nl_pid; /* process pid */ + unsigned nl_groups; /* multicast groups mask */ +}; + struct nlmsghdr { - unsigned long nlmsg_len; /* Length of message including header */ - unsigned long nlmsg_type; /* Message type */ - unsigned long nlmsg_seq; /* Sequence number */ - unsigned long nlmsg_pid; /* Sending process PID */ - unsigned char nlmsg_data[0]; + __u32 nlmsg_len; /* Length of message including header */ + __u16 nlmsg_type; /* Message content */ + __u16 nlmsg_flags; /* Additional flags */ + __u32 nlmsg_seq; /* Sequence number */ + __kernel_pid_t 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 /* If succeed, reply with ack */ +#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 */ + +/* + 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) ((nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ + (nlh)->nlmsg_len <= (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 */ + +#ifdef __KERNEL__ + +struct netlink_skb_parms +{ + struct ucred creds; /* Skb credentials */ + pid_t pid; + unsigned groups; + pid_t dst_pid; + unsigned dst_groups; }; -#define NLMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) ) +#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) +#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) -#define NLMSG_ACK 0x01 /* int - error code */ -#define NLMSG_OVERRUN 0x02 /* unsigned long[2] - start and end - * of lost message sequence numbers. - */ + +extern int netlink_attach(int unit, int (*function)(int,struct sk_buff *skb)); +extern void netlink_detach(int unit); +extern int netlink_post(int unit, struct sk_buff *skb); +extern int init_netlink(void); +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, pid_t pid, int nonblock); +extern void netlink_broadcast(struct sock *ssk, struct sk_buff *skb, pid_t pid, + unsigned group, int allocation); +extern void netlink_set_err(struct sock *ssk, pid_t pid, unsigned group, int code); + +/* + * skb should fit one page. This choice is good for headerless malloc. + * + * FIXME: What is the best size for SLAB???? --ANK + */ +#define NLMSG_GOODSIZE (PAGE_SIZE - ((sizeof(struct sk_buff)+0xF)&~0xF)) + + +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); + long args[4]; +}; + +#if 0 + +void* nlmsg_broadcast(struct sock*, unsigned long type, int len, unsigned groups); +struct skb_buff *nlmsg_alloc(unsigned long type, int len, + unsigned long seq, unsigned long pid, int allocation); +void __nlmsg_transmit(struct sock*, int allocation); + +extern __inline__ void nlmsg_release(struct sk_buff *skb) +{ + atomic_dec(skb->users); +} + +extern __inline__ void nlmsg_transmit(struct sk_buff *sk, int allocation) +{ + if (sk->write_queue.qlen) + __nlmsg_transmit(sk, allocation); +} #endif + +extern __inline__ struct nlmsghdr * +__nlmsg_put(struct sk_buff *skb, pid_t 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) < 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*)); + + +extern void netlink_proto_init(struct net_proto *pro); + +#endif /* __KERNEL__ */ + +#endif /* __LINUX_NETLINK_H */ |