1 #ifndef __LINUX_NETLINK_H 2 #define __LINUX_NETLINK_H 3 4 #include <linux/socket.h> /* for __kernel_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 /* Unused number, formerly ip_queue */ 11 #define NETLINK_SOCK_DIAG 4 /* 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 #define NETLINK_RDMA 20 28 #define NETLINK_CRYPTO 21 /* Crypto layer */ 29 30 #define NETLINK_INET_DIAG NETLINK_SOCK_DIAG 31 32 #define MAX_LINKS 32 33 34 struct sockaddr_nl { 35 __kernel_sa_family_t nl_family; /* AF_NETLINK */ 36 unsigned short nl_pad; /* zero */ 37 __u32 nl_pid; /* port ID */ 38 __u32 nl_groups; /* multicast groups mask */ 39 }; 40 41 struct nlmsghdr { 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 #define NLM_F_DUMP_INTR 16 /* Dump was inconsistent due to sequence change */ 56 57 /* Modifiers to GET request */ 58 #define NLM_F_ROOT 0x100 /* specify tree root */ 59 #define NLM_F_MATCH 0x200 /* return all matching */ 60 #define NLM_F_ATOMIC 0x400 /* atomic GET */ 61 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 62 63 /* Modifiers to NEW request */ 64 #define NLM_F_REPLACE 0x100 /* Override existing */ 65 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 66 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 67 #define NLM_F_APPEND 0x800 /* Add to end of list */ 68 69 /* 70 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 71 4.4BSD CHANGE NLM_F_REPLACE 72 73 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 74 Append NLM_F_CREATE 75 Check NLM_F_EXCL 76 */ 77 78 #define NLMSG_ALIGNTO 4U 79 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 80 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) 81 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) 82 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 83 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 84 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 85 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 86 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 87 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 88 (nlh)->nlmsg_len <= (len)) 89 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 90 91 #define NLMSG_NOOP 0x1 /* Nothing. */ 92 #define NLMSG_ERROR 0x2 /* Error */ 93 #define NLMSG_DONE 0x3 /* End of a dump */ 94 #define NLMSG_OVERRUN 0x4 /* Data lost */ 95 96 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ 97 98 struct nlmsgerr { 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 __u32 group; 111 }; 112 113 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ 114 115 enum { 116 NETLINK_UNCONNECTED = 0, 117 NETLINK_CONNECTED, 118 }; 119 120 /* 121 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> 122 * +---------------------+- - -+- - - - - - - - - -+- - -+ 123 * | Header | Pad | Payload | Pad | 124 * | (struct nlattr) | ing | | ing | 125 * +---------------------+- - -+- - - - - - - - - -+- - -+ 126 * <-------------- nlattr->nla_len --------------> 127 */ 128 129 struct nlattr { 130 __u16 nla_len; 131 __u16 nla_type; 132 }; 133 134 /* 135 * nla_type (16 bits) 136 * +---+---+-------------------------------+ 137 * | N | O | Attribute Type | 138 * +---+---+-------------------------------+ 139 * N := Carries nested attributes 140 * O := Payload stored in network byte order 141 * 142 * Note: The N and O flag are mutually exclusive. 143 */ 144 #define NLA_F_NESTED (1 << 15) 145 #define NLA_F_NET_BYTEORDER (1 << 14) 146 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) 147 148 #define NLA_ALIGNTO 4 149 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) 150 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) 151 152 #ifdef __KERNEL__ 153 154 #include <linux/capability.h> 155 #include <linux/skbuff.h> 156 #include <linux/export.h> 157 #include <net/scm.h> 158 159 struct net; 160 161 static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) 162 { 163 return (struct nlmsghdr *)skb->data; 164 } 165 166 struct netlink_skb_parms { 167 struct scm_creds creds; /* Skb credentials */ 168 __u32 portid; 169 __u32 dst_group; 170 struct sock *ssk; 171 }; 172 173 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 174 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 175 176 177 extern void netlink_table_grab(void); 178 extern void netlink_table_ungrab(void); 179 180 #define NL_CFG_F_NONROOT_RECV (1 << 0) 181 #define NL_CFG_F_NONROOT_SEND (1 << 1) 182 183 /* optional Netlink kernel configuration parameters */ 184 struct netlink_kernel_cfg { 185 unsigned int groups; 186 unsigned int flags; 187 void (*input)(struct sk_buff *skb); 188 struct mutex *cb_mutex; 189 void (*bind)(int group); 190 }; 191 192 extern struct sock *__netlink_kernel_create(struct net *net, int unit, 193 struct module *module, 194 struct netlink_kernel_cfg *cfg); 195 static inline struct sock * 196 netlink_kernel_create(struct net *net, int unit, struct netlink_kernel_cfg *cfg) 197 { 198 return __netlink_kernel_create(net, unit, THIS_MODULE, cfg); 199 } 200 201 extern void netlink_kernel_release(struct sock *sk); 202 extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); 203 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); 204 extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); 205 extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); 206 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 207 extern int netlink_has_listeners(struct sock *sk, unsigned int group); 208 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock); 209 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid, 210 __u32 group, gfp_t allocation); 211 extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, 212 __u32 portid, __u32 group, gfp_t allocation, 213 int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), 214 void *filter_data); 215 extern int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code); 216 extern int netlink_register_notifier(struct notifier_block *nb); 217 extern int netlink_unregister_notifier(struct notifier_block *nb); 218 219 /* finegrained unicast helpers: */ 220 struct sock *netlink_getsockbyfilp(struct file *filp); 221 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, 222 long *timeo, struct sock *ssk); 223 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); 224 int netlink_sendskb(struct sock *sk, struct sk_buff *skb); 225 226 /* 227 * skb should fit one page. This choice is good for headerless malloc. 228 * But we should limit to 8K so that userspace does not have to 229 * use enormous buffer sizes on recvmsg() calls just to avoid 230 * MSG_TRUNC when PAGE_SIZE is very large. 231 */ 232 #if PAGE_SIZE < 8192UL 233 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) 234 #else 235 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) 236 #endif 237 238 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) 239 240 241 struct netlink_callback { 242 struct sk_buff *skb; 243 const struct nlmsghdr *nlh; 244 int (*dump)(struct sk_buff * skb, 245 struct netlink_callback *cb); 246 int (*done)(struct netlink_callback *cb); 247 void *data; 248 u16 family; 249 u16 min_dump_alloc; 250 unsigned int prev_seq, seq; 251 long args[6]; 252 }; 253 254 struct netlink_notify { 255 struct net *net; 256 int portid; 257 int protocol; 258 }; 259 260 struct nlmsghdr * 261 __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags); 262 263 struct netlink_dump_control { 264 int (*dump)(struct sk_buff *skb, struct netlink_callback *); 265 int (*done)(struct netlink_callback*); 266 void *data; 267 u16 min_dump_alloc; 268 }; 269 270 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 271 const struct nlmsghdr *nlh, 272 struct netlink_dump_control *control); 273 274 #endif /* __KERNEL__ */ 275 276 #endif /* __LINUX_NETLINK_H */ 277