1#ifndef __LINUX_NETLINK_H 2#define __LINUX_NETLINK_H 3 4#define NETLINK_ROUTE 0 /* Routing/device hook */ 5#define NETLINK_SKIP 1 /* Reserved for ENskip */ 6#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ 7#define NETLINK_FIREWALL 3 /* Firewalling hook */ 8#define NETLINK_TCPDIAG 4 /* TCP socket monitoring */ 9#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ 10#define NETLINK_ARPD 8 11#define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */ 12#define NETLINK_IP6_FW 13 13#define NETLINK_DNRTMSG 14 /* DECnet routing messages */ 14#define NETLINK_TAPBASE 16 /* 16 to 31 are ethertap */ 15 16#define MAX_LINKS 32 17 18struct sockaddr_nl 19{ 20 sa_family_t nl_family; /* AF_NETLINK */ 21 unsigned short nl_pad; /* zero */ 22 __u32 nl_pid; /* process pid */ 23 __u32 nl_groups; /* multicast groups mask */ 24}; 25 26struct nlmsghdr 27{ 28 __u32 nlmsg_len; /* Length of message including header */ 29 __u16 nlmsg_type; /* Message content */ 30 __u16 nlmsg_flags; /* Additional flags */ 31 __u32 nlmsg_seq; /* Sequence number */ 32 __u32 nlmsg_pid; /* Sending process PID */ 33}; 34 35/* Flags values */ 36 37#define NLM_F_REQUEST 1 /* It is request message. */ 38#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ 39#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ 40#define NLM_F_ECHO 8 /* Echo this request */ 41 42/* Modifiers to GET request */ 43#define NLM_F_ROOT 0x100 /* specify tree root */ 44#define NLM_F_MATCH 0x200 /* return all matching */ 45#define NLM_F_ATOMIC 0x400 /* atomic GET */ 46#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 47 48/* Modifiers to NEW request */ 49#define NLM_F_REPLACE 0x100 /* Override existing */ 50#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 51#define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 52#define NLM_F_APPEND 0x800 /* Add to end of list */ 53 54/* 55 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 56 4.4BSD CHANGE NLM_F_REPLACE 57 58 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 59 Append NLM_F_CREATE 60 Check NLM_F_EXCL 61 */ 62 63#define NLMSG_ALIGNTO 4 64#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 65#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr))) 66#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 67#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 68#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 69 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 70#define NLMSG_OK(nlh,len) ((len) > 0 && (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 71 (nlh)->nlmsg_len <= (len)) 72#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 73 74#define NLMSG_NOOP 0x1 /* Nothing. */ 75#define NLMSG_ERROR 0x2 /* Error */ 76#define NLMSG_DONE 0x3 /* End of a dump */ 77#define NLMSG_OVERRUN 0x4 /* Data lost */ 78 79struct nlmsgerr 80{ 81 int error; 82 struct nlmsghdr msg; 83}; 84 85#define NET_MAJOR 36 /* Major 36 is reserved for networking */ 86 87#ifdef __KERNEL__ 88 89struct netlink_skb_parms 90{ 91 struct ucred creds; /* Skb credentials */ 92 __u32 pid; 93 __u32 groups; 94 __u32 dst_pid; 95 __u32 dst_groups; 96 kernel_cap_t eff_cap; 97}; 98 99#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 100#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 101 102 103extern int netlink_attach(int unit, int (*function)(int,struct sk_buff *skb)); 104extern void netlink_detach(int unit); 105extern int netlink_post(int unit, struct sk_buff *skb); 106extern int init_netlink(void); 107extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len)); 108extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 109extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 110extern void netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 111 __u32 group, int allocation); 112extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); 113extern int netlink_register_notifier(struct notifier_block *nb); 114extern int netlink_unregister_notifier(struct notifier_block *nb); 115 116#define NLMSG_GOODSIZE (PAGE_SIZE - ((sizeof(struct sk_buff)+0xF)&~0xF)) 117 118 119struct netlink_callback 120{ 121 struct sk_buff *skb; 122 struct nlmsghdr *nlh; 123 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); 124 int (*done)(struct netlink_callback *cb); 125 int family; 126 long args[4]; 127}; 128 129struct netlink_notify 130{ 131 int pid; 132 int protocol; 133}; 134 135static __inline__ struct nlmsghdr * 136__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len) 137{ 138 struct nlmsghdr *nlh; 139 int size = NLMSG_LENGTH(len); 140 141 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); 142 nlh->nlmsg_type = type; 143 nlh->nlmsg_len = size; 144 nlh->nlmsg_flags = 0; 145 nlh->nlmsg_pid = pid; 146 nlh->nlmsg_seq = seq; 147 return nlh; 148} 149 150#define NLMSG_PUT(skb, pid, seq, type, len) \ 151({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) goto nlmsg_failure; \ 152 __nlmsg_put(skb, pid, seq, type, len); }) 153 154extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 155 struct nlmsghdr *nlh, 156 int (*dump)(struct sk_buff *skb, struct netlink_callback*), 157 int (*done)(struct netlink_callback*)); 158 159#define NL_NONROOT_RECV 0x1 160#define NL_NONROOT_SEND 0x2 161extern void netlink_set_nonroot(int protocol, unsigned flag); 162 163 164#endif /* __KERNEL__ */ 165 166#endif /* __LINUX_NETLINK_H */ 167