Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Evgeniy Polyakov | bb5427b | 2006-03-23 19:11:58 +0300 | [diff] [blame] | 8 | #define NETLINK_UNUSED 1 /* Unused number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ |
| 10 | #define NETLINK_FIREWALL 3 /* Firewalling hook */ |
Arnaldo Carvalho de Melo | 73c1f4a | 2005-08-12 12:51:49 -0300 | [diff] [blame] | 11 | #define NETLINK_INET_DIAG 4 /* INET socket monitoring */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ |
| 13 | #define NETLINK_XFRM 6 /* ipsec */ |
| 14 | #define NETLINK_SELINUX 7 /* SELinux event notifications */ |
David S. Miller | 4d479e4 | 2005-08-08 13:48:02 -0700 | [diff] [blame] | 15 | #define NETLINK_ISCSI 8 /* Open-iSCSI */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #define NETLINK_AUDIT 9 /* auditing */ |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 17 | #define NETLINK_FIB_LOOKUP 10 |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 18 | #define NETLINK_CONNECTOR 11 |
David S. Miller | 63522f7 | 2005-07-11 14:29:11 -0700 | [diff] [blame] | 19 | #define NETLINK_NETFILTER 12 /* netfilter subsystem */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #define NETLINK_IP6_FW 13 |
| 21 | #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ |
| 22 | #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ |
David S. Miller | 20ae975 | 2005-09-14 20:52:37 -0700 | [diff] [blame] | 23 | #define NETLINK_GENERIC 16 |
James Smart | 84314fd | 2006-08-18 17:30:09 -0400 | [diff] [blame] | 24 | /* leave room for NETLINK_DM (DM Events) */ |
| 25 | #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ |
Michael Halcrow | 88b4a07 | 2007-02-12 00:53:43 -0800 | [diff] [blame] | 26 | #define NETLINK_ECRYPTFS 19 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | #define MAX_LINKS 32 |
| 29 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 30 | struct net; |
| 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | struct sockaddr_nl |
| 33 | { |
| 34 | sa_family_t nl_family; /* AF_NETLINK */ |
| 35 | unsigned short nl_pad; /* zero */ |
Herbert Xu | cf130cb | 2007-05-05 11:42:03 -0700 | [diff] [blame] | 36 | __u32 nl_pid; /* port ID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Herbert Xu | cf130cb | 2007-05-05 11:42:03 -0700 | [diff] [blame] | 46 | __u32 nlmsg_pid; /* Sending process port ID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) ) |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 79 | #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) |
| 80 | #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 95 | #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ |
| 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | struct nlmsgerr |
| 98 | { |
| 99 | int error; |
| 100 | struct nlmsghdr msg; |
| 101 | }; |
| 102 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 103 | #define NETLINK_ADD_MEMBERSHIP 1 |
| 104 | #define NETLINK_DROP_MEMBERSHIP 2 |
| 105 | #define NETLINK_PKTINFO 3 |
| 106 | |
| 107 | struct nl_pktinfo |
| 108 | { |
| 109 | __u32 group; |
| 110 | }; |
| 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | #define NET_MAJOR 36 /* Major 36 is reserved for networking */ |
| 113 | |
| 114 | enum { |
| 115 | NETLINK_UNCONNECTED = 0, |
| 116 | NETLINK_CONNECTED, |
| 117 | }; |
| 118 | |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 119 | /* |
| 120 | * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> |
| 121 | * +---------------------+- - -+- - - - - - - - - -+- - -+ |
| 122 | * | Header | Pad | Payload | Pad | |
| 123 | * | (struct nlattr) | ing | | ing | |
| 124 | * +---------------------+- - -+- - - - - - - - - -+- - -+ |
| 125 | * <-------------- nlattr->nla_len --------------> |
| 126 | */ |
| 127 | |
| 128 | struct nlattr |
| 129 | { |
| 130 | __u16 nla_len; |
| 131 | __u16 nla_type; |
| 132 | }; |
| 133 | |
Thomas Graf | 8f4c1f9 | 2007-09-12 14:44:36 +0200 | [diff] [blame] | 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 | |
Thomas Graf | bfa83a9 | 2005-11-10 02:25:51 +0100 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | #ifdef __KERNEL__ |
| 153 | |
| 154 | #include <linux/capability.h> |
| 155 | #include <linux/skbuff.h> |
| 156 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 157 | static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) |
| 158 | { |
| 159 | return (struct nlmsghdr *)skb->data; |
| 160 | } |
| 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | struct netlink_skb_parms |
| 163 | { |
| 164 | struct ucred creds; /* Skb credentials */ |
| 165 | __u32 pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 166 | __u32 dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | kernel_cap_t eff_cap; |
Serge Hallyn | c94c257 | 2005-04-29 16:27:17 +0100 | [diff] [blame] | 168 | __u32 loginuid; /* Login (audit) uid */ |
Steve Grubb | e7c3497 | 2006-04-03 09:08:13 -0400 | [diff] [blame] | 169 | __u32 sid; /* SELinux security id */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | }; |
| 171 | |
| 172 | #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) |
| 173 | #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) |
| 174 | |
| 175 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 176 | extern struct sock *netlink_kernel_create(struct net *net, |
| 177 | int unit,unsigned int groups, |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 178 | void (*input)(struct sk_buff *skb), |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 179 | struct mutex *cb_mutex, |
| 180 | struct module *module); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 181 | extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 182 | extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 184 | extern int netlink_has_listeners(struct sock *sk, unsigned int group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 187 | __u32 group, gfp_t allocation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); |
| 189 | extern int netlink_register_notifier(struct notifier_block *nb); |
| 190 | extern int netlink_unregister_notifier(struct notifier_block *nb); |
| 191 | |
| 192 | /* finegrained unicast helpers: */ |
| 193 | struct sock *netlink_getsockbyfilp(struct file *filp); |
Alexey Kuznetsov | a70ea99 | 2006-02-09 16:40:11 -0800 | [diff] [blame] | 194 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 195 | long *timeo, struct sock *ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb); |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 197 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
| 199 | /* |
| 200 | * skb should fit one page. This choice is good for headerless malloc. |
David S. Miller | fc910a2 | 2007-03-25 20:27:59 -0700 | [diff] [blame] | 201 | * But we should limit to 8K so that userspace does not have to |
| 202 | * use enormous buffer sizes on recvmsg() calls just to avoid |
| 203 | * MSG_TRUNC when PAGE_SIZE is very large. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | */ |
David S. Miller | fc910a2 | 2007-03-25 20:27:59 -0700 | [diff] [blame] | 205 | #if PAGE_SIZE < 8192UL |
| 206 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) |
| 207 | #else |
| 208 | #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) |
| 209 | #endif |
| 210 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 211 | #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | |
| 214 | struct netlink_callback |
| 215 | { |
| 216 | struct sk_buff *skb; |
| 217 | struct nlmsghdr *nlh; |
| 218 | int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); |
| 219 | int (*done)(struct netlink_callback *cb); |
| 220 | int family; |
Alexey Kuznetsov | 18b504e | 2005-06-21 12:38:48 -0700 | [diff] [blame] | 221 | long args[5]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | }; |
| 223 | |
| 224 | struct netlink_notify |
| 225 | { |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 226 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | int pid; |
| 228 | int protocol; |
| 229 | }; |
| 230 | |
| 231 | static __inline__ struct nlmsghdr * |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 232 | __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
| 234 | struct nlmsghdr *nlh; |
| 235 | int size = NLMSG_LENGTH(len); |
| 236 | |
| 237 | nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); |
| 238 | nlh->nlmsg_type = type; |
| 239 | nlh->nlmsg_len = size; |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 240 | nlh->nlmsg_flags = flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | nlh->nlmsg_pid = pid; |
| 242 | nlh->nlmsg_seq = seq; |
Patrick McHardy | b3563c4 | 2005-06-28 12:54:43 -0700 | [diff] [blame] | 243 | memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | return nlh; |
| 245 | } |
| 246 | |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 247 | #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ |
Thomas Graf | f88a10d | 2005-06-18 22:50:12 -0700 | [diff] [blame] | 248 | ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \ |
| 249 | goto nlmsg_failure; \ |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 250 | __nlmsg_put(skb, pid, seq, type, len, flags); }) |
Thomas Graf | f88a10d | 2005-06-18 22:50:12 -0700 | [diff] [blame] | 251 | |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 252 | #define NLMSG_PUT(skb, pid, seq, type, len) \ |
| 253 | NLMSG_NEW(skb, pid, seq, type, len, 0) |
| 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
| 256 | struct nlmsghdr *nlh, |
| 257 | int (*dump)(struct sk_buff *skb, struct netlink_callback*), |
| 258 | int (*done)(struct netlink_callback*)); |
| 259 | |
| 260 | |
| 261 | #define NL_NONROOT_RECV 0x1 |
| 262 | #define NL_NONROOT_SEND 0x2 |
| 263 | extern void netlink_set_nonroot(int protocol, unsigned flag); |
| 264 | |
| 265 | #endif /* __KERNEL__ */ |
| 266 | |
| 267 | #endif /* __LINUX_NETLINK_H */ |