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 { 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 { 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 54 /* Modifiers to GET request */ 55 #define NLM_F_ROOT 0x100 /* specify tree root */ 56 #define NLM_F_MATCH 0x200 /* return all matching */ 57 #define NLM_F_ATOMIC 0x400 /* atomic GET */ 58 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 59 60 /* Modifiers to NEW request */ 61 #define NLM_F_REPLACE 0x100 /* Override existing */ 62 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 63 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 64 #define NLM_F_APPEND 0x800 /* Add to end of list */ 65 66 /* 67 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 68 4.4BSD CHANGE NLM_F_REPLACE 69 70 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 71 Append NLM_F_CREATE 72 Check NLM_F_EXCL 73 */ 74 75 #define NLMSG_ALIGNTO 4 76 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 77 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) 78 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) 79 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 80 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 81 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 82 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 83 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 84 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 85 (nlh)->nlmsg_len <= (len)) 86 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 87 88 #define NLMSG_NOOP 0x1 /* Nothing. */ 89 #define NLMSG_ERROR 0x2 /* Error */ 90 #define NLMSG_DONE 0x3 /* End of a dump */ 91 #define NLMSG_OVERRUN 0x4 /* Data lost */ 92 93 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ 94 95 struct nlmsgerr 96 { 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 3 104 105 struct nl_pktinfo 106 { 107 __u32 group; 108 }; 109 110 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ 111 112 enum { 113 NETLINK_UNCONNECTED = 0, 114 NETLINK_CONNECTED, 115 }; 116 117 /* 118 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> 119 * +---------------------+- - -+- - - - - - - - - -+- - -+ 120 * | Header | Pad | Payload | Pad | 121 * | (struct nlattr) | ing | | ing | 122 * +---------------------+- - -+- - - - - - - - - -+- - -+ 123 * <-------------- nlattr->nla_len --------------> 124 */ 125 126 struct nlattr 127 { 128 __u16 nla_len; 129 __u16 nla_type; 130 }; 131 132 #define NLA_ALIGNTO 4 133 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) 134 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) 135 136 #ifdef __KERNEL__ 137 138 #include <linux/capability.h> 139 #include <linux/skbuff.h> 140 141 static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) 142 { 143 return (struct nlmsghdr *)skb->data; 144 } 145 146 struct netlink_skb_parms 147 { 148 struct ucred creds; /* Skb credentials */ 149 __u32 pid; 150 __u32 dst_group; 151 kernel_cap_t eff_cap; 152 __u32 loginuid; /* Login (audit) uid */ 153 __u32 sid; /* SELinux security id */ 154 }; 155 156 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 157 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 158 159 160 extern struct sock *netlink_kernel_create(int unit, unsigned int groups, 161 void (*input)(struct sock *sk, int len), 162 struct mutex *cb_mutex, 163 struct module *module); 164 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); 165 extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); 166 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 167 extern int netlink_has_listeners(struct sock *sk, unsigned int group); 168 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 169 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 170 __u32 group, gfp_t allocation); 171 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); 172 extern int netlink_register_notifier(struct notifier_block *nb); 173 extern int netlink_unregister_notifier(struct notifier_block *nb); 174 175 /* finegrained unicast helpers: */ 176 struct sock *netlink_getsockbyfilp(struct file *filp); 177 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, 178 long timeo, struct sock *ssk); 179 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); 180 int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol); 181 182 /* 183 * skb should fit one page. This choice is good for headerless malloc. 184 * But we should limit to 8K so that userspace does not have to 185 * use enormous buffer sizes on recvmsg() calls just to avoid 186 * MSG_TRUNC when PAGE_SIZE is very large. 187 */ 188 #if PAGE_SIZE < 8192UL 189 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) 190 #else 191 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) 192 #endif 193 194 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) 195 196 197 struct netlink_callback 198 { 199 struct sk_buff *skb; 200 struct nlmsghdr *nlh; 201 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); 202 int (*done)(struct netlink_callback *cb); 203 int family; 204 long args[5]; 205 }; 206 207 struct netlink_notify 208 { 209 int pid; 210 int protocol; 211 }; 212 213 static __inline__ struct nlmsghdr * 214 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) 215 { 216 struct nlmsghdr *nlh; 217 int size = NLMSG_LENGTH(len); 218 219 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); 220 nlh->nlmsg_type = type; 221 nlh->nlmsg_len = size; 222 nlh->nlmsg_flags = flags; 223 nlh->nlmsg_pid = pid; 224 nlh->nlmsg_seq = seq; 225 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); 226 return nlh; 227 } 228 229 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ 230 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \ 231 goto nlmsg_failure; \ 232 __nlmsg_put(skb, pid, seq, type, len, flags); }) 233 234 #define NLMSG_PUT(skb, pid, seq, type, len) \ 235 NLMSG_NEW(skb, pid, seq, type, len, 0) 236 237 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 238 struct nlmsghdr *nlh, 239 int (*dump)(struct sk_buff *skb, struct netlink_callback*), 240 int (*done)(struct netlink_callback*)); 241 242 243 #define NL_NONROOT_RECV 0x1 244 #define NL_NONROOT_SEND 0x2 245 extern void netlink_set_nonroot(int protocol, unsigned flag); 246 247 #endif /* __KERNEL__ */ 248 249 #endif /* __LINUX_NETLINK_H */ 250