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_UNUSED 1 /* Unused number */ 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_CONNECTOR 11 19 #define NETLINK_NETFILTER 12 /* netfilter subsystem */ 20 #define NETLINK_IP6_FW 13 21 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ 22 #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ 23 #define NETLINK_GENERIC 16 24 /* leave room for NETLINK_DM (DM Events) */ 25 #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ 26 #define NETLINK_ECRYPTFS 19 27 28 #define MAX_LINKS 32 29 30 struct net; 31 32 struct sockaddr_nl 33 { 34 sa_family_t nl_family; /* AF_NETLINK */ 35 unsigned short nl_pad; /* zero */ 36 __u32 nl_pid; /* port ID */ 37 __u32 nl_groups; /* multicast groups mask */ 38 }; 39 40 struct nlmsghdr 41 { 42 __u32 nlmsg_len; /* Length of message including header */ 43 __u16 nlmsg_type; /* Message content */ 44 __u16 nlmsg_flags; /* Additional flags */ 45 __u32 nlmsg_seq; /* Sequence number */ 46 __u32 nlmsg_pid; /* Sending process port ID */ 47 }; 48 49 /* Flags values */ 50 51 #define NLM_F_REQUEST 1 /* It is request message. */ 52 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ 53 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ 54 #define NLM_F_ECHO 8 /* Echo this request */ 55 56 /* Modifiers to GET request */ 57 #define NLM_F_ROOT 0x100 /* specify tree root */ 58 #define NLM_F_MATCH 0x200 /* return all matching */ 59 #define NLM_F_ATOMIC 0x400 /* atomic GET */ 60 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 61 62 /* Modifiers to NEW request */ 63 #define NLM_F_REPLACE 0x100 /* Override existing */ 64 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 65 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 66 #define NLM_F_APPEND 0x800 /* Add to end of list */ 67 68 /* 69 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 70 4.4BSD CHANGE NLM_F_REPLACE 71 72 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 73 Append NLM_F_CREATE 74 Check NLM_F_EXCL 75 */ 76 77 #define NLMSG_ALIGNTO 4 78 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 79 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) 80 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) 81 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 82 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 83 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 84 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 85 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 86 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 87 (nlh)->nlmsg_len <= (len)) 88 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 89 90 #define NLMSG_NOOP 0x1 /* Nothing. */ 91 #define NLMSG_ERROR 0x2 /* Error */ 92 #define NLMSG_DONE 0x3 /* End of a dump */ 93 #define NLMSG_OVERRUN 0x4 /* Data lost */ 94 95 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ 96 97 struct nlmsgerr 98 { 99 int error; 100 struct nlmsghdr msg; 101 }; 102 103 #define NETLINK_ADD_MEMBERSHIP 1 104 #define NETLINK_DROP_MEMBERSHIP 2 105 #define NETLINK_PKTINFO 3 106 #define NETLINK_BROADCAST_ERROR 4 107 #define NETLINK_NO_ENOBUFS 5 108 109 struct nl_pktinfo 110 { 111 __u32 group; 112 }; 113 114 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ 115 116 enum { 117 NETLINK_UNCONNECTED = 0, 118 NETLINK_CONNECTED, 119 }; 120 121 /* 122 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> 123 * +---------------------+- - -+- - - - - - - - - -+- - -+ 124 * | Header | Pad | Payload | Pad | 125 * | (struct nlattr) | ing | | ing | 126 * +---------------------+- - -+- - - - - - - - - -+- - -+ 127 * <-------------- nlattr->nla_len --------------> 128 */ 129 130 struct nlattr 131 { 132 __u16 nla_len; 133 __u16 nla_type; 134 }; 135 136 /* 137 * nla_type (16 bits) 138 * +---+---+-------------------------------+ 139 * | N | O | Attribute Type | 140 * +---+---+-------------------------------+ 141 * N := Carries nested attributes 142 * O := Payload stored in network byte order 143 * 144 * Note: The N and O flag are mutually exclusive. 145 */ 146 #define NLA_F_NESTED (1 << 15) 147 #define NLA_F_NET_BYTEORDER (1 << 14) 148 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) 149 150 #define NLA_ALIGNTO 4 151 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) 152 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) 153 154 #ifdef __KERNEL__ 155 156 #include <linux/capability.h> 157 #include <linux/skbuff.h> 158 159 static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) 160 { 161 return (struct nlmsghdr *)skb->data; 162 } 163 164 struct netlink_skb_parms 165 { 166 struct ucred creds; /* Skb credentials */ 167 __u32 pid; 168 __u32 dst_group; 169 kernel_cap_t eff_cap; 170 __u32 loginuid; /* Login (audit) uid */ 171 __u32 sessionid; /* Session id (audit) */ 172 __u32 sid; /* SELinux security id */ 173 }; 174 175 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 176 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 177 178 179 extern void netlink_table_grab(void); 180 extern void netlink_table_ungrab(void); 181 182 extern struct sock *netlink_kernel_create(struct net *net, 183 int unit,unsigned int groups, 184 void (*input)(struct sk_buff *skb), 185 struct mutex *cb_mutex, 186 struct module *module); 187 extern void netlink_kernel_release(struct sock *sk); 188 extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); 189 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); 190 extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); 191 extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); 192 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 193 extern int netlink_has_listeners(struct sock *sk, unsigned int group); 194 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 195 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 196 __u32 group, gfp_t allocation); 197 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); 198 extern int netlink_register_notifier(struct notifier_block *nb); 199 extern int netlink_unregister_notifier(struct notifier_block *nb); 200 201 /* finegrained unicast helpers: */ 202 struct sock *netlink_getsockbyfilp(struct file *filp); 203 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, 204 long *timeo, struct sock *ssk); 205 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); 206 int netlink_sendskb(struct sock *sk, struct sk_buff *skb); 207 208 /* 209 * skb should fit one page. This choice is good for headerless malloc. 210 * But we should limit to 8K so that userspace does not have to 211 * use enormous buffer sizes on recvmsg() calls just to avoid 212 * MSG_TRUNC when PAGE_SIZE is very large. 213 */ 214 #if PAGE_SIZE < 8192UL 215 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) 216 #else 217 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) 218 #endif 219 220 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) 221 222 223 struct netlink_callback 224 { 225 struct sk_buff *skb; 226 const struct nlmsghdr *nlh; 227 int (*dump)(struct sk_buff * skb, 228 struct netlink_callback *cb); 229 int (*done)(struct netlink_callback *cb); 230 int family; 231 long args[6]; 232 }; 233 234 struct netlink_notify 235 { 236 struct net *net; 237 int pid; 238 int protocol; 239 }; 240 241 static __inline__ struct nlmsghdr * 242 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) 243 { 244 struct nlmsghdr *nlh; 245 int size = NLMSG_LENGTH(len); 246 247 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); 248 nlh->nlmsg_type = type; 249 nlh->nlmsg_len = size; 250 nlh->nlmsg_flags = flags; 251 nlh->nlmsg_pid = pid; 252 nlh->nlmsg_seq = seq; 253 if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) 254 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); 255 return nlh; 256 } 257 258 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ 259 ({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \ 260 goto nlmsg_failure; \ 261 __nlmsg_put(skb, pid, seq, type, len, flags); }) 262 263 #define NLMSG_PUT(skb, pid, seq, type, len) \ 264 NLMSG_NEW(skb, pid, seq, type, len, 0) 265 266 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 267 const struct nlmsghdr *nlh, 268 int (*dump)(struct sk_buff *skb, struct netlink_callback*), 269 int (*done)(struct netlink_callback*)); 270 271 272 #define NL_NONROOT_RECV 0x1 273 #define NL_NONROOT_SEND 0x2 274 extern void netlink_set_nonroot(int protocol, unsigned flag); 275 276 #endif /* __KERNEL__ */ 277 278 #endif /* __LINUX_NETLINK_H */ 279
