1 #ifndef __LINUX_NETLINK_H 2 #define __LINUX_NETLINK_H 3 4 #include <linux/socket.h> /* for sa_family_t */ 5 #include <linux/types.h> 6 7 #define NETLINK_ROUTE 0 /* Routing/device hook */ 8 #define NETLINK_SKIP 1 /* Reserved for ENskip */ 9 #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ 10 #define NETLINK_FIREWALL 3 /* Firewalling hook */ 11 #define NETLINK_TCPDIAG 4 /* TCP socket monitoring */ 12 #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ 13 #define NETLINK_XFRM 6 /* ipsec */ 14 #define NETLINK_SELINUX 7 /* SELinux event notifications */ 15 #define NETLINK_ARPD 8 16 #define NETLINK_AUDIT 9 /* auditing */ 17 #define NETLINK_FIB_LOOKUP 10 18 #define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */ 19 #define NETLINK_IP6_FW 13 20 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ 21 #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ 22 #define NETLINK_TAPBASE 16 /* 16 to 31 are ethertap */ 23 24 #define MAX_LINKS 32 25 26 struct sockaddr_nl 27 { 28 sa_family_t nl_family; /* AF_NETLINK */ 29 unsigned short nl_pad; /* zero */ 30 __u32 nl_pid; /* process pid */ 31 __u32 nl_groups; /* multicast groups mask */ 32 }; 33 34 struct nlmsghdr 35 { 36 __u32 nlmsg_len; /* Length of message including header */ 37 __u16 nlmsg_type; /* Message content */ 38 __u16 nlmsg_flags; /* Additional flags */ 39 __u32 nlmsg_seq; /* Sequence number */ 40 __u32 nlmsg_pid; /* Sending process PID */ 41 }; 42 43 /* Flags values */ 44 45 #define NLM_F_REQUEST 1 /* It is request message. */ 46 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ 47 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ 48 #define NLM_F_ECHO 8 /* Echo this request */ 49 50 /* Modifiers to GET request */ 51 #define NLM_F_ROOT 0x100 /* specify tree root */ 52 #define NLM_F_MATCH 0x200 /* return all matching */ 53 #define NLM_F_ATOMIC 0x400 /* atomic GET */ 54 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 55 56 /* Modifiers to NEW request */ 57 #define NLM_F_REPLACE 0x100 /* Override existing */ 58 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 59 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 60 #define NLM_F_APPEND 0x800 /* Add to end of list */ 61 62 /* 63 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 64 4.4BSD CHANGE NLM_F_REPLACE 65 66 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 67 Append NLM_F_CREATE 68 Check NLM_F_EXCL 69 */ 70 71 #define NLMSG_ALIGNTO 4 72 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 73 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr))) 74 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 75 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 76 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 77 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 78 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 79 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 80 (nlh)->nlmsg_len <= (len)) 81 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 82 83 #define NLMSG_NOOP 0x1 /* Nothing. */ 84 #define NLMSG_ERROR 0x2 /* Error */ 85 #define NLMSG_DONE 0x3 /* End of a dump */ 86 #define NLMSG_OVERRUN 0x4 /* Data lost */ 87 88 struct nlmsgerr 89 { 90 int error; 91 struct nlmsghdr msg; 92 }; 93 94 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ 95 96 enum { 97 NETLINK_UNCONNECTED = 0, 98 NETLINK_CONNECTED, 99 }; 100 101 #ifdef __KERNEL__ 102 103 #include <linux/capability.h> 104 #include <linux/skbuff.h> 105 106 struct netlink_skb_parms 107 { 108 struct ucred creds; /* Skb credentials */ 109 __u32 pid; 110 __u32 groups; 111 __u32 dst_pid; 112 __u32 dst_groups; 113 kernel_cap_t eff_cap; 114 __u32 loginuid; /* Login (audit) uid */ 115 }; 116 117 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 118 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 119 120 121 extern struct sock *netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len)); 122 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 123 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 124 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 125 __u32 group, int allocation); 126 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); 127 extern int netlink_register_notifier(struct notifier_block *nb); 128 extern int netlink_unregister_notifier(struct notifier_block *nb); 129 130 /* finegrained unicast helpers: */ 131 struct sock *netlink_getsockbyfilp(struct file *filp); 132 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo); 133 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); 134 int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol); 135 136 /* 137 * skb should fit one page. This choice is good for headerless malloc. 138 */ 139 #define NLMSG_GOODORDER 0 140 #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER)) 141 142 143 struct netlink_callback 144 { 145 struct sk_buff *skb; 146 struct nlmsghdr *nlh; 147 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); 148 int (*done)(struct netlink_callback *cb); 149 int family; 150 long args[5]; 151 }; 152 153 struct netlink_notify 154 { 155 int pid; 156 int protocol; 157 }; 158 159 static __inline__ struct nlmsghdr * 160 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) 161 { 162 struct nlmsghdr *nlh; 163 int size = NLMSG_LENGTH(len); 164 165 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); 166 nlh->nlmsg_type = type; 167 nlh->nlmsg_len = size; 168 nlh->nlmsg_flags = flags; 169 nlh->nlmsg_pid = pid; 170 nlh->nlmsg_seq = seq; 171 return nlh; 172 } 173 174 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ 175 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \ 176 goto nlmsg_failure; \ 177 __nlmsg_put(skb, pid, seq, type, len, flags); }) 178 179 #define NLMSG_PUT(skb, pid, seq, type, len) \ 180 NLMSG_NEW(skb, pid, seq, type, len, 0) 181 182 #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \ 183 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \ 184 (cb)->nlh->nlmsg_seq, type, len, flags) 185 186 #define NLMSG_END(skb, nlh) \ 187 ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \ 188 (skb)->len; }) 189 190 #define NLMSG_CANCEL(skb, nlh) \ 191 ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \ 192 -1; }) 193 194 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 195 struct nlmsghdr *nlh, 196 int (*dump)(struct sk_buff *skb, struct netlink_callback*), 197 int (*done)(struct netlink_callback*)); 198 199 200 #define NL_NONROOT_RECV 0x1 201 #define NL_NONROOT_SEND 0x2 202 extern void netlink_set_nonroot(int protocol, unsigned flag); 203 204 #endif /* __KERNEL__ */ 205 206 #endif /* __LINUX_NETLINK_H */ 207