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 27 #define MAX_LINKS 32 28 29 struct sockaddr_nl 30 { 31 sa_family_t nl_family; /* AF_NETLINK */ 32 unsigned short nl_pad; /* zero */ 33 __u32 nl_pid; /* process pid */ 34 __u32 nl_groups; /* multicast groups mask */ 35 }; 36 37 struct nlmsghdr 38 { 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 PID */ 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 4 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 { 96 int error; 97 struct nlmsghdr msg; 98 }; 99 100 #define NETLINK_ADD_MEMBERSHIP 1 101 #define NETLINK_DROP_MEMBERSHIP 2 102 #define NETLINK_PKTINFO 3 103 104 struct nl_pktinfo 105 { 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 { 127 __u16 nla_len; 128 __u16 nla_type; 129 }; 130 131 #define NLA_ALIGNTO 4 132 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) 133 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) 134 135 #ifdef __KERNEL__ 136 137 #include <linux/capability.h> 138 #include <linux/skbuff.h> 139 140 struct netlink_skb_parms 141 { 142 struct ucred creds; /* Skb credentials */ 143 __u32 pid; 144 __u32 dst_group; 145 kernel_cap_t eff_cap; 146 __u32 loginuid; /* Login (audit) uid */ 147 __u32 sid; /* SELinux security id */ 148 }; 149 150 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 151 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 152 153 154 extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module); 155 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 156 extern int netlink_has_listeners(struct sock *sk, unsigned int group); 157 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 158 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 159 __u32 group, gfp_t allocation); 160 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); 161 extern int netlink_register_notifier(struct notifier_block *nb); 162 extern int netlink_unregister_notifier(struct notifier_block *nb); 163 164 /* finegrained unicast helpers: */ 165 struct sock *netlink_getsockbyfilp(struct file *filp); 166 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, 167 long timeo, struct sock *ssk); 168 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); 169 int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol); 170 171 /* 172 * skb should fit one page. This choice is good for headerless malloc. 173 */ 174 #define NLMSG_GOODORDER 0 175 #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER)) 176 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) 177 178 179 struct netlink_callback 180 { 181 struct sk_buff *skb; 182 struct nlmsghdr *nlh; 183 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); 184 int (*done)(struct netlink_callback *cb); 185 int family; 186 long args[5]; 187 }; 188 189 struct netlink_notify 190 { 191 int pid; 192 int protocol; 193 }; 194 195 static __inline__ struct nlmsghdr * 196 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) 197 { 198 struct nlmsghdr *nlh; 199 int size = NLMSG_LENGTH(len); 200 201 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); 202 nlh->nlmsg_type = type; 203 nlh->nlmsg_len = size; 204 nlh->nlmsg_flags = flags; 205 nlh->nlmsg_pid = pid; 206 nlh->nlmsg_seq = seq; 207 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); 208 return nlh; 209 } 210 211 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ 212 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \ 213 goto nlmsg_failure; \ 214 __nlmsg_put(skb, pid, seq, type, len, flags); }) 215 216 #define NLMSG_PUT(skb, pid, seq, type, len) \ 217 NLMSG_NEW(skb, pid, seq, type, len, 0) 218 219 #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \ 220 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \ 221 (cb)->nlh->nlmsg_seq, type, len, flags) 222 223 #define NLMSG_END(skb, nlh) \ 224 ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \ 225 (skb)->len; }) 226 227 #define NLMSG_CANCEL(skb, nlh) \ 228 ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \ 229 -1; }) 230 231 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 232 struct nlmsghdr *nlh, 233 int (*dump)(struct sk_buff *skb, struct netlink_callback*), 234 int (*done)(struct netlink_callback*)); 235 236 237 #define NL_NONROOT_RECV 0x1 238 #define NL_NONROOT_SEND 0x2 239 extern void netlink_set_nonroot(int protocol, unsigned flag); 240 241 #endif /* __KERNEL__ */ 242 243 #endif /* __LINUX_NETLINK_H */ 244