netlink.h 7.5 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244
  1. #ifndef __LINUX_NETLINK_H
  2. #define __LINUX_NETLINK_H
  3. #include <linux/socket.h> /* for sa_family_t */
  4. #include <linux/types.h>
  5. #define NETLINK_ROUTE 0 /* Routing/device hook */
  6. #define NETLINK_UNUSED 1 /* Unused number */
  7. #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
  8. #define NETLINK_FIREWALL 3 /* Firewalling hook */
  9. #define NETLINK_INET_DIAG 4 /* INET socket monitoring */
  10. #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
  11. #define NETLINK_XFRM 6 /* ipsec */
  12. #define NETLINK_SELINUX 7 /* SELinux event notifications */
  13. #define NETLINK_ISCSI 8 /* Open-iSCSI */
  14. #define NETLINK_AUDIT 9 /* auditing */
  15. #define NETLINK_FIB_LOOKUP 10
  16. #define NETLINK_CONNECTOR 11
  17. #define NETLINK_NETFILTER 12 /* netfilter subsystem */
  18. #define NETLINK_IP6_FW 13
  19. #define NETLINK_DNRTMSG 14 /* DECnet routing messages */
  20. #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
  21. #define NETLINK_GENERIC 16
  22. /* leave room for NETLINK_DM (DM Events) */
  23. #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */
  24. #define NETLINK_ECRYPTFS 19
  25. #define MAX_LINKS 32
  26. struct sockaddr_nl
  27. {
  28. sa_family_t nl_family; /* AF_NETLINK */
  29. unsigned short nl_pad; /* zero */
  30. __u32 nl_pid; /* process pid */
  31. __u32 nl_groups; /* multicast groups mask */
  32. };
  33. struct nlmsghdr
  34. {
  35. __u32 nlmsg_len; /* Length of message including header */
  36. __u16 nlmsg_type; /* Message content */
  37. __u16 nlmsg_flags; /* Additional flags */
  38. __u32 nlmsg_seq; /* Sequence number */
  39. __u32 nlmsg_pid; /* Sending process PID */
  40. };
  41. /* Flags values */
  42. #define NLM_F_REQUEST 1 /* It is request message. */
  43. #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */
  44. #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */
  45. #define NLM_F_ECHO 8 /* Echo this request */
  46. /* Modifiers to GET request */
  47. #define NLM_F_ROOT 0x100 /* specify tree root */
  48. #define NLM_F_MATCH 0x200 /* return all matching */
  49. #define NLM_F_ATOMIC 0x400 /* atomic GET */
  50. #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH)
  51. /* Modifiers to NEW request */
  52. #define NLM_F_REPLACE 0x100 /* Override existing */
  53. #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */
  54. #define NLM_F_CREATE 0x400 /* Create, if it does not exist */
  55. #define NLM_F_APPEND 0x800 /* Add to end of list */
  56. /*
  57. 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
  58. 4.4BSD CHANGE NLM_F_REPLACE
  59. True CHANGE NLM_F_CREATE|NLM_F_REPLACE
  60. Append NLM_F_CREATE
  61. Check NLM_F_EXCL
  62. */
  63. #define NLMSG_ALIGNTO 4
  64. #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
  65. #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
  66. #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN))
  67. #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
  68. #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
  69. #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
  70. (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
  71. #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
  72. (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
  73. (nlh)->nlmsg_len <= (len))
  74. #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
  75. #define NLMSG_NOOP 0x1 /* Nothing. */
  76. #define NLMSG_ERROR 0x2 /* Error */
  77. #define NLMSG_DONE 0x3 /* End of a dump */
  78. #define NLMSG_OVERRUN 0x4 /* Data lost */
  79. #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
  80. struct nlmsgerr
  81. {
  82. int error;
  83. struct nlmsghdr msg;
  84. };
  85. #define NETLINK_ADD_MEMBERSHIP 1
  86. #define NETLINK_DROP_MEMBERSHIP 2
  87. #define NETLINK_PKTINFO 3
  88. struct nl_pktinfo
  89. {
  90. __u32 group;
  91. };
  92. #define NET_MAJOR 36 /* Major 36 is reserved for networking */
  93. enum {
  94. NETLINK_UNCONNECTED = 0,
  95. NETLINK_CONNECTED,
  96. };
  97. /*
  98. * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
  99. * +---------------------+- - -+- - - - - - - - - -+- - -+
  100. * | Header | Pad | Payload | Pad |
  101. * | (struct nlattr) | ing | | ing |
  102. * +---------------------+- - -+- - - - - - - - - -+- - -+
  103. * <-------------- nlattr->nla_len -------------->
  104. */
  105. struct nlattr
  106. {
  107. __u16 nla_len;
  108. __u16 nla_type;
  109. };
  110. #define NLA_ALIGNTO 4
  111. #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
  112. #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
  113. #ifdef __KERNEL__
  114. #include <linux/capability.h>
  115. #include <linux/skbuff.h>
  116. struct netlink_skb_parms
  117. {
  118. struct ucred creds; /* Skb credentials */
  119. __u32 pid;
  120. __u32 dst_group;
  121. kernel_cap_t eff_cap;
  122. __u32 loginuid; /* Login (audit) uid */
  123. __u32 sid; /* SELinux security id */
  124. };
  125. #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
  126. #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds)
  127. extern struct sock *netlink_kernel_create(int unit, unsigned int groups, void (*input)(struct sock *sk, int len), struct module *module);
  128. extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err);
  129. extern int netlink_has_listeners(struct sock *sk, unsigned int group);
  130. extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock);
  131. extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid,
  132. __u32 group, gfp_t allocation);
  133. extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code);
  134. extern int netlink_register_notifier(struct notifier_block *nb);
  135. extern int netlink_unregister_notifier(struct notifier_block *nb);
  136. /* finegrained unicast helpers: */
  137. struct sock *netlink_getsockbyfilp(struct file *filp);
  138. int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
  139. long timeo, struct sock *ssk);
  140. void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
  141. int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
  142. /*
  143. * skb should fit one page. This choice is good for headerless malloc.
  144. */
  145. #define NLMSG_GOODORDER 0
  146. #define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
  147. #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
  148. struct netlink_callback
  149. {
  150. struct sk_buff *skb;
  151. struct nlmsghdr *nlh;
  152. int (*dump)(struct sk_buff * skb, struct netlink_callback *cb);
  153. int (*done)(struct netlink_callback *cb);
  154. int family;
  155. long args[5];
  156. };
  157. struct netlink_notify
  158. {
  159. int pid;
  160. int protocol;
  161. };
  162. static __inline__ struct nlmsghdr *
  163. __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
  164. {
  165. struct nlmsghdr *nlh;
  166. int size = NLMSG_LENGTH(len);
  167. nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size));
  168. nlh->nlmsg_type = type;
  169. nlh->nlmsg_len = size;
  170. nlh->nlmsg_flags = flags;
  171. nlh->nlmsg_pid = pid;
  172. nlh->nlmsg_seq = seq;
  173. memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size);
  174. return nlh;
  175. }
  176. #define NLMSG_NEW(skb, pid, seq, type, len, flags) \
  177. ({ if (skb_tailroom(skb) < (int)NLMSG_SPACE(len)) \
  178. goto nlmsg_failure; \
  179. __nlmsg_put(skb, pid, seq, type, len, flags); })
  180. #define NLMSG_PUT(skb, pid, seq, type, len) \
  181. NLMSG_NEW(skb, pid, seq, type, len, 0)
  182. #define NLMSG_NEW_ANSWER(skb, cb, type, len, flags) \
  183. NLMSG_NEW(skb, NETLINK_CB((cb)->skb).pid, \
  184. (cb)->nlh->nlmsg_seq, type, len, flags)
  185. #define NLMSG_END(skb, nlh) \
  186. ({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
  187. (skb)->len; })
  188. #define NLMSG_CANCEL(skb, nlh) \
  189. ({ skb_trim(skb, (unsigned char *) (nlh) - (skb)->data); \
  190. -1; })
  191. extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
  192. struct nlmsghdr *nlh,
  193. int (*dump)(struct sk_buff *skb, struct netlink_callback*),
  194. int (*done)(struct netlink_callback*));
  195. #define NL_NONROOT_RECV 0x1
  196. #define NL_NONROOT_SEND 0x2
  197. extern void netlink_set_nonroot(int protocol, unsigned flag);
  198. #endif /* __KERNEL__ */
  199. #endif /* __LINUX_NETLINK_H */