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