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_W1 1 /* 1-wire subsystem */ 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 25 #define MAX_LINKS 32 26 27 struct sockaddr_nl 28 { 29 sa_family_t nl_family; /* AF_NETLINK */ 30 unsigned short nl_pad; /* zero */ 31 __u32 nl_pid; /* process pid */ 32 __u32 nl_groups; /* multicast groups mask */ 33 }; 34 35 struct nlmsghdr 36 { 37 __u32 nlmsg_len; /* Length of message including header */ 38 __u16 nlmsg_type; /* Message content */ 39 __u16 nlmsg_flags; /* Additional flags */ 40 __u32 nlmsg_seq; /* Sequence number */ 41 __u32 nlmsg_pid; /* Sending process PID */ 42 }; 43 44 /* Flags values */ 45 46 #define NLM_F_REQUEST 1 /* It is request message. */ 47 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ 48 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ 49 #define NLM_F_ECHO 8 /* Echo this request */ 50 51 /* Modifiers to GET request */ 52 #define NLM_F_ROOT 0x100 /* specify tree root */ 53 #define NLM_F_MATCH 0x200 /* return all matching */ 54 #define NLM_F_ATOMIC 0x400 /* atomic GET */ 55 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) 56 57 /* Modifiers to NEW request */ 58 #define NLM_F_REPLACE 0x100 /* Override existing */ 59 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ 60 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ 61 #define NLM_F_APPEND 0x800 /* Add to end of list */ 62 63 /* 64 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL 65 4.4BSD CHANGE NLM_F_REPLACE 66 67 True CHANGE NLM_F_CREATE|NLM_F_REPLACE 68 Append NLM_F_CREATE 69 Check NLM_F_EXCL 70 */ 71 72 #define NLMSG_ALIGNTO 4 73 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) 74 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) 75 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) 76 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) 77 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) 78 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ 79 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) 80 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ 81 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ 82 (nlh)->nlmsg_len <= (len)) 83 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) 84 85 #define NLMSG_NOOP 0x1 /* Nothing. */ 86 #define NLMSG_ERROR 0x2 /* Error */ 87 #define NLMSG_DONE 0x3 /* End of a dump */ 88 #define NLMSG_OVERRUN 0x4 /* Data lost */ 89 90 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ 91 92 struct nlmsgerr 93 { 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 3 101 102 struct nl_pktinfo 103 { 104 __u32 group; 105 }; 106 107 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ 108 109 enum { 110 NETLINK_UNCONNECTED = 0, 111 NETLINK_CONNECTED, 112 }; 113 114 /* 115 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> 116 * +---------------------+- - -+- - - - - - - - - -+- - -+ 117 * | Header | Pad | Payload | Pad | 118 * | (struct nlattr) | ing | | ing | 119 * +---------------------+- - -+- - - - - - - - - -+- - -+ 120 * <-------------- nlattr->nla_len --------------> 121 */ 122 123 struct nlattr 124 { 125 __u16 nla_len; 126 __u16 nla_type; 127 }; 128 129 #define NLA_ALIGNTO 4 130 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) 131 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) 132 133 #ifdef __KERNEL__ 134 135 #include <linux/capability.h> 136 #include <linux/skbuff.h> 137 138 struct netlink_skb_parms 139 { 140 struct ucred creds; /* Skb credentials */ 141 __u32 pid; 142 __u32 dst_pid; 143 __u32 dst_group; 144 kernel_cap_t eff_cap; 145 __u32 loginuid; /* Login (audit) uid */ 146 }; 147 148 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) 149 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) 150 151 152 extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module); 153 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); 154 extern int netlink_has_listeners(struct sock *sk, unsigned int group); 155 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); 156 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, 157 __u32 group, gfp_t allocation); 158 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); 159 extern int netlink_register_notifier(struct notifier_block *nb); 160 extern int netlink_unregister_notifier(struct notifier_block *nb); 161 162 /* finegrained unicast helpers: */ 163 struct sock *netlink_getsockbyfilp(struct file *filp); 164 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock, 165 long timeo, struct sock *ssk); 166 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); 167 int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol); 168 169 /* 170 * skb should fit one page. This choice is good for headerless malloc. 171 */ 172 #define NLMSG_GOODORDER 0 173 #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER)) 174 175 176 struct netlink_callback 177 { 178 struct sk_buff *skb; 179 struct nlmsghdr *nlh; 180 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); 181 int (*done)(struct netlink_callback *cb); 182 int family; 183 long args[5]; 184 }; 185 186 struct netlink_notify 187 { 188 int pid; 189 int protocol; 190 }; 191 192 static __inline__ struct nlmsghdr * 193 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) 194 { 195 struct nlmsghdr *nlh; 196 int size = NLMSG_LENGTH(len); 197 198 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); 199 nlh->nlmsg_type = type; 200 nlh->nlmsg_len = size; 201 nlh->nlmsg_flags = flags; 202 nlh->nlmsg_pid = pid; 203 nlh->nlmsg_seq = seq; 204 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); 205 return nlh; 206 } 207 208 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ 209 ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \ 210 goto nlmsg_failure; \ 211 __nlmsg_put(skb, pid, seq, type, len, flags); }) 212 213 #define NLMSG_PUT(skb, pid, seq, type, len) \ 214 NLMSG_NEW(skb, pid, seq, type, len, 0) 215 216 #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \ 217 NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \ 218 (cb)->nlh->nlmsg_seq, type, len, flags) 219 220 #define NLMSG_END(skb, nlh) \ 221 ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \ 222 (skb)->len; }) 223 224 #define NLMSG_CANCEL(skb, nlh) \ 225 ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \ 226 -1; }) 227 228 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, 229 struct nlmsghdr *nlh, 230 int (*dump)(struct sk_buff *skb, struct netlink_callback*), 231 int (*done)(struct netlink_callback*)); 232 233 234 #define NL_NONROOT_RECV 0x1 235 #define NL_NONROOT_SEND 0x2 236 extern void netlink_set_nonroot(int protocol, unsigned flag); 237 238 #endif /* __KERNEL__ */ 239 240 #endif /* __LINUX_NETLINK_H */ 241