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 /* 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 #define NETLINK_RDMA 20 28 #define NETLINK_CRYPTO 21 /* Crypto layer */ 29 30 #define MAX_LINKS 32 31 32 struct sockaddr_nl { 33 __kernel_sa_family_t nl_family; /* AF_NETLINK */ 34 unsigned short nl_pad; /* zero */ 35 __u32 nl_pid; /* port ID */ 36 __u32 nl_groups; /* multicast groups mask */ 37 }; 38 39 struct nlmsghdr { 40 __u32 nlmsg_len; /* Length of message including header */ 41 __u16 nlmsg_type; /* Message content */ 42 __u16 nlmsg_flags; /* Additional flags */ 43 __u32 nlmsg_seq; /* Sequence number */ 44 __u32 nlmsg_pid; /* Sending process port ID */ 45 }; 46 47 /* Flags values */ 48 49 #define NLM_F_REQUEST 1 /* It is request message. */ 50 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ 51 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ 52 #define NLM_F_ECHO 8 /* Echo this request */ 53 #define NLM_F_DUMP_INTR 16 /* Dump was inconsistent due to sequence change */ 54 55 /* Modifiers to GET request */ 56 #define NLM_F_ROOT 0x100 /* specify tree root */ 57 #define NLM_F_MATCH 0x200 /* return all matching */ 58 #define NLM_F_ATOMIC 0x400 /* atomic GET */ 59 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 60 61 /* Modifiers to NEW request */ 62 #define NLM_F_REPLACE 0x100 /* Override existing */ 63 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 64 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 65 #define NLM_F_APPEND 0x800 /* Add to end of list */ 66 67 /* 68 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 69 4.4BSD CHANGE NLM_F_REPLACE 70 71 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 72 Append NLM_F_CREATE 73 Check NLM_F_EXCL 74 */ 75 76 #define NLMSG_ALIGNTO 4U 77 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 78 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) 79 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) 80 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 81 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 82 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 83 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 84 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 85 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 86 (nlh)->nlmsg_len <= (len)) 87 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 88 89 #define NLMSG_NOOP 0x1 /* Nothing. */ 90 #define NLMSG_ERROR 0x2 /* Error */ 91 #define NLMSG_DONE 0x3 /* End of a dump */ 92 #define NLMSG_OVERRUN 0x4 /* Data lost */ 93 94 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ 95 96 struct nlmsgerr { 97 int error; 98 struct nlmsghdr msg; 99 }; 100 101 #define NETLINK_ADD_MEMBERSHIP 1 102 #define NETLINK_DROP_MEMBERSHIP 2 103 #define NETLINK_PKTINFO 3 104 #define NETLINK_BROADCAST_ERROR 4 105 #define NETLINK_NO_ENOBUFS 5 106 107 struct nl_pktinfo { 108 __u32 group; 109 }; 110 111 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ 112 113 enum { 114 NETLINK_UNCONNECTED = 0, 115 NETLINK_CONNECTED, 116 }; 117 118 /* 119 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> 120 * +---------------------+- - -+- - - - - - - - - -+- - -+ 121 * | Header | Pad | Payload | Pad | 122 * | (struct nlattr) | ing | | ing | 123 * +---------------------+- - -+- - - - - - - - - -+- - -+ 124 * <-------------- nlattr->nla_len --------------> 125 */ 126 127 struct nlattr { 128 __u16 nla_len; 129 __u16 nla_type; 130 }; 131 132 /* 133 * nla_type (16 bits) 134 * +---+---+-------------------------------+ 135 * | N | O | Attribute Type | 136 * +---+---+-------------------------------+ 137 * N := Carries nested attributes 138 * O := Payload stored in network byte order 139 * 140 * Note: The N and O flag are mutually exclusive. 141 */ 142 #define NLA_F_NESTED (1 << 15) 143 #define NLA_F_NET_BYTEORDER (1 << 14) 144 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) 145 146 #define NLA_ALIGNTO 4 147 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) 148 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) 149 150 #ifdef __KERNEL__ 151 152 #include <linux/capability.h> 153 #include <linux/skbuff.h> 154 155 struct net; 156 157 static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) 158 { 159 return (struct nlmsghdr *)skb->data; 160 } 161 162 struct netlink_skb_parms { 163 struct ucred creds; /* Skb credentials */ 164 __u32 pid; 165 __u32 dst_group; 166 }; 167 168 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 169 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 170 171 172 extern void netlink_table_grab(void); 173 extern void netlink_table_ungrab(void); 174 175 extern struct sock *netlink_kernel_create(struct net *net, 176 int unit,unsigned int groups, 177 void (*input)(struct sk_buff *skb), 178 struct mutex *cb_mutex, 179 struct module *module); 180 extern void netlink_kernel_release(struct sock *sk); 181 extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); 182 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); 183 extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); 184 extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); 185 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 186 extern int netlink_has_listeners(struct sock *sk, unsigned int group); 187 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 188 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 189 __u32 group, gfp_t allocation); 190 extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, 191 __u32 pid, __u32 group, gfp_t allocation, 192 int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), 193 void *filter_data); 194 extern int netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); 195 extern int netlink_register_notifier(struct notifier_block *nb); 196 extern int netlink_unregister_notifier(struct notifier_block *nb); 197 198 /* finegrained unicast helpers: */ 199 struct sock *netlink_getsockbyfilp(struct file *filp); 200 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, 201 long *timeo, struct sock *ssk); 202 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); 203 int netlink_sendskb(struct sock *sk, struct sk_buff *skb); 204 205 /* 206 * skb should fit one page. This choice is good for headerless malloc. 207 * But we should limit to 8K so that userspace does not have to 208 * use enormous buffer sizes on recvmsg() calls just to avoid 209 * MSG_TRUNC when PAGE_SIZE is very large. 210 */ 211 #if PAGE_SIZE < 8192UL 212 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) 213 #else 214 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) 215 #endif 216 217 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) 218 219 220 struct netlink_callback { 221 struct sk_buff *skb; 222 const struct nlmsghdr *nlh; 223 int (*dump)(struct sk_buff * skb, 224 struct netlink_callback *cb); 225 int (*done)(struct netlink_callback *cb); 226 u16 family; 227 u16 min_dump_alloc; 228 unsigned int prev_seq, seq; 229 long args[6]; 230 }; 231 232 struct netlink_notify { 233 struct net *net; 234 int pid; 235 int protocol; 236 }; 237 238 static __inline__ struct nlmsghdr * 239 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) 240 { 241 struct nlmsghdr *nlh; 242 int size = NLMSG_LENGTH(len); 243 244 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); 245 nlh->nlmsg_type = type; 246 nlh->nlmsg_len = size; 247 nlh->nlmsg_flags = flags; 248 nlh->nlmsg_pid = pid; 249 nlh->nlmsg_seq = seq; 250 if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) 251 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); 252 return nlh; 253 } 254 255 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ 256 ({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \ 257 goto nlmsg_failure; \ 258 __nlmsg_put(skb, pid, seq, type, len, flags); }) 259 260 #define NLMSG_PUT(skb, pid, seq, type, len) \ 261 NLMSG_NEW(skb, pid, seq, type, len, 0) 262 263 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 264 const struct nlmsghdr *nlh, 265 int (*dump)(struct sk_buff *skb, struct netlink_callback*), 266 int (*done)(struct netlink_callback*), 267 u16 min_dump_alloc); 268 269 270 #define NL_NONROOT_RECV 0x1 271 #define NL_NONROOT_SEND 0x2 272 extern void netlink_set_nonroot(int protocol, unsigned flag); 273 274 #endif /* __KERNEL__ */ 275 276 #endif /* __LINUX_NETLINK_H */ 277