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_W1 1 /* 1-wire subsystem */ 9 #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ 10 #define NETLINK_FIREWALL 3 /* Firewalling hook */ 11 #define NETLINK_INET_DIAG 4 /* INET 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_ISCSI 8 /* Open-iSCSI */ 16 #define NETLINK_AUDIT 9 /* auditing */ 17 #define NETLINK_FIB_LOOKUP 10 18 #define NETLINK_NETFILTER 12 /* netfilter subsystem */ 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 23 #define MAX_LINKS 32 24 25 struct sockaddr_nl 26 { 27 sa_family_t nl_family; /* AF_NETLINK */ 28 unsigned short nl_pad; /* zero */ 29 __u32 nl_pid; /* process pid */ 30 __u32 nl_groups; /* multicast groups mask */ 31 }; 32 33 struct nlmsghdr 34 { 35 __u32 nlmsg_len; /* Length of message including header */ 36 __u16 nlmsg_type; /* Message content */ 37 __u16 nlmsg_flags; /* Additional flags */ 38 __u32 nlmsg_seq; /* Sequence number */ 39 __u32 nlmsg_pid; /* Sending process PID */ 40 }; 41 42 /* Flags values */ 43 44 #define NLM_F_REQUEST 1 /* It is request message. */ 45 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ 46 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ 47 #define NLM_F_ECHO 8 /* Echo this request */ 48 49 /* Modifiers to GET request */ 50 #define NLM_F_ROOT 0x100 /* specify tree root */ 51 #define NLM_F_MATCH 0x200 /* return all matching */ 52 #define NLM_F_ATOMIC 0x400 /* atomic GET */ 53 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 54 55 /* Modifiers to NEW request */ 56 #define NLM_F_REPLACE 0x100 /* Override existing */ 57 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 58 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 59 #define NLM_F_APPEND 0x800 /* Add to end of list */ 60 61 /* 62 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 63 4.4BSD CHANGE NLM_F_REPLACE 64 65 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 66 Append NLM_F_CREATE 67 Check NLM_F_EXCL 68 */ 69 70 #define NLMSG_ALIGNTO 4 71 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 72 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(sizeof(struct nlmsghdr))) 73 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 74 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 75 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 76 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 77 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 78 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 79 (nlh)->nlmsg_len <= (len)) 80 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 81 82 #define NLMSG_NOOP 0x1 /* Nothing. */ 83 #define NLMSG_ERROR 0x2 /* Error */ 84 #define NLMSG_DONE 0x3 /* End of a dump */ 85 #define NLMSG_OVERRUN 0x4 /* Data lost */ 86 87 struct nlmsgerr 88 { 89 int error; 90 struct nlmsghdr msg; 91 }; 92 93 #define NETLINK_ADD_MEMBERSHIP 1 94 #define NETLINK_DROP_MEMBERSHIP 2 95 #define NETLINK_PKTINFO 3 96 97 struct nl_pktinfo 98 { 99 __u32 group; 100 }; 101 102 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ 103 104 enum { 105 NETLINK_UNCONNECTED = 0, 106 NETLINK_CONNECTED, 107 }; 108 109 #ifdef __KERNEL__ 110 111 #include <linux/capability.h> 112 #include <linux/skbuff.h> 113 114 struct netlink_skb_parms 115 { 116 struct ucred creds; /* Skb credentials */ 117 __u32 pid; 118 __u32 dst_pid; 119 __u32 dst_group; 120 kernel_cap_t eff_cap; 121 __u32 loginuid; /* Login (audit) uid */ 122 }; 123 124 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 125 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 126 127 128 extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module); 129 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 130 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 131 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 132 __u32 group, unsigned int __nocast allocation); 133 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); 134 extern int netlink_register_notifier(struct notifier_block *nb); 135 extern int netlink_unregister_notifier(struct notifier_block *nb); 136 137 /* finegrained unicast helpers: */ 138 struct sock *netlink_getsockbyfilp(struct file *filp); 139 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, long timeo); 140 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); 141 int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol); 142 143 /* 144 * skb should fit one page. This choice is good for headerless malloc. 145 */ 146 #define NLMSG_GOODORDER 0 147 #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER)) 148 149 150 struct netlink_callback 151 { 152 struct sk_buff *skb; 153 struct nlmsghdr *nlh; 154 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); 155 int (*done)(struct netlink_callback *cb); 156 int family; 157 long args[5]; 158 }; 159 160 struct netlink_notify 161 { 162 int pid; 163 int protocol; 164 }; 165 166 static __inline__ struct nlmsghdr * 167 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) 168 { 169 struct nlmsghdr *nlh; 170 int size = NLMSG_LENGTH(len); 171 172 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); 173 nlh->nlmsg_type = type; 174 nlh->nlmsg_len = size; 175 nlh->nlmsg_flags = flags; 176 nlh->nlmsg_pid = pid; 177 nlh->nlmsg_seq = seq; 178 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); 179 return nlh; 180 } 181 182 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ 183 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \ 184 goto nlmsg_failure; \ 185 __nlmsg_put(skb, pid, seq, type, len, flags); }) 186 187 #define NLMSG_PUT(skb, pid, seq, type, len) \ 188 NLMSG_NEW(skb, pid, seq, type, len, 0) 189 190 #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \ 191 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \ 192 (cb)->nlh->nlmsg_seq, type, len, flags) 193 194 #define NLMSG_END(skb, nlh) \ 195 ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \ 196 (skb)->len; }) 197 198 #define NLMSG_CANCEL(skb, nlh) \ 199 ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \ 200 -1; }) 201 202 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 203 struct nlmsghdr *nlh, 204 int (*dump)(struct sk_buff *skb, struct netlink_callback*), 205 int (*done)(struct netlink_callback*)); 206 207 208 #define NL_NONROOT_RECV 0x1 209 #define NL_NONROOT_SEND 0x2 210 extern void netlink_set_nonroot(int protocol, unsigned flag); 211 212 #endif /* __KERNEL__ */ 213 214 #endif /* __LINUX_NETLINK_H */ 215