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