From 516477a5d20d28ac2c945f5d717a39de954260bb Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Wed, 22 Dec 2010 20:46:46 +0100 Subject: headers: add local copy of linux/netlink.h to libmnl Davem suggested to add a copy of linux/netlink.h to avoid compilation problems in all cases scenarios. Signed-off-by: Pablo Neira Ayuso --- include/Makefile.am | 2 +- include/linux/Makefile.am | 1 + include/linux/netlink.h | 274 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 276 insertions(+), 1 deletion(-) create mode 100644 include/linux/Makefile.am create mode 100644 include/linux/netlink.h (limited to 'include') diff --git a/include/Makefile.am b/include/Makefile.am index 976b9f8..bc92c42 100644 --- a/include/Makefile.am +++ b/include/Makefile.am @@ -1 +1 @@ -SUBDIRS = libmnl +SUBDIRS = libmnl linux diff --git a/include/linux/Makefile.am b/include/linux/Makefile.am new file mode 100644 index 0000000..2d02887 --- /dev/null +++ b/include/linux/Makefile.am @@ -0,0 +1 @@ +noinst_HEADERS = netlink.h diff --git a/include/linux/netlink.h b/include/linux/netlink.h new file mode 100644 index 0000000..1235669 --- /dev/null +++ b/include/linux/netlink.h @@ -0,0 +1,274 @@ +#ifndef __LINUX_NETLINK_H +#define __LINUX_NETLINK_H + +#include /* for sa_family_t */ +#include + +#define NETLINK_ROUTE 0 /* Routing/device hook */ +#define NETLINK_UNUSED 1 /* Unused number */ +#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ +#define NETLINK_FIREWALL 3 /* Firewalling hook */ +#define NETLINK_INET_DIAG 4 /* INET socket monitoring */ +#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ +#define NETLINK_XFRM 6 /* ipsec */ +#define NETLINK_SELINUX 7 /* SELinux event notifications */ +#define NETLINK_ISCSI 8 /* Open-iSCSI */ +#define NETLINK_AUDIT 9 /* auditing */ +#define NETLINK_FIB_LOOKUP 10 +#define NETLINK_CONNECTOR 11 +#define NETLINK_NETFILTER 12 /* netfilter subsystem */ +#define NETLINK_IP6_FW 13 +#define NETLINK_DNRTMSG 14 /* DECnet routing messages */ +#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ +#define NETLINK_GENERIC 16 +/* leave room for NETLINK_DM (DM Events) */ +#define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ +#define NETLINK_ECRYPTFS 19 + +#define MAX_LINKS 32 + +struct sockaddr_nl { + sa_family_t nl_family; /* AF_NETLINK */ + unsigned short nl_pad; /* zero */ + __u32 nl_pid; /* port ID */ + __u32 nl_groups; /* multicast groups mask */ +}; + +struct nlmsghdr { + __u32 nlmsg_len; /* Length of message including header */ + __u16 nlmsg_type; /* Message content */ + __u16 nlmsg_flags; /* Additional flags */ + __u32 nlmsg_seq; /* Sequence number */ + __u32 nlmsg_pid; /* Sending process port ID */ +}; + +/* Flags values */ + +#define NLM_F_REQUEST 1 /* It is request message. */ +#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ +#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ +#define NLM_F_ECHO 8 /* Echo this request */ + +/* Modifiers to GET request */ +#define NLM_F_ROOT 0x100 /* specify tree root */ +#define NLM_F_MATCH 0x200 /* return all matching */ +#define NLM_F_ATOMIC 0x400 /* atomic GET */ +#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) + +/* Modifiers to NEW request */ +#define NLM_F_REPLACE 0x100 /* Override existing */ +#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ +#define NLM_F_CREATE 0x400 /* Create, if it does not exist */ +#define NLM_F_APPEND 0x800 /* Add to end of list */ + +/* + 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL + 4.4BSD CHANGE NLM_F_REPLACE + + True CHANGE NLM_F_CREATE|NLM_F_REPLACE + Append NLM_F_CREATE + Check NLM_F_EXCL + */ + +#define NLMSG_ALIGNTO 4 +#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) +#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) +#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) +#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) +#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) +#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ + (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) +#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ + (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ + (nlh)->nlmsg_len <= (len)) +#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) + +#define NLMSG_NOOP 0x1 /* Nothing. */ +#define NLMSG_ERROR 0x2 /* Error */ +#define NLMSG_DONE 0x3 /* End of a dump */ +#define NLMSG_OVERRUN 0x4 /* Data lost */ + +#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ + +struct nlmsgerr { + int error; + struct nlmsghdr msg; +}; + +#define NETLINK_ADD_MEMBERSHIP 1 +#define NETLINK_DROP_MEMBERSHIP 2 +#define NETLINK_PKTINFO 3 +#define NETLINK_BROADCAST_ERROR 4 +#define NETLINK_NO_ENOBUFS 5 + +struct nl_pktinfo { + __u32 group; +}; + +#define NET_MAJOR 36 /* Major 36 is reserved for networking */ + +enum { + NETLINK_UNCONNECTED = 0, + NETLINK_CONNECTED, +}; + +/* + * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> + * +---------------------+- - -+- - - - - - - - - -+- - -+ + * | Header | Pad | Payload | Pad | + * | (struct nlattr) | ing | | ing | + * +---------------------+- - -+- - - - - - - - - -+- - -+ + * <-------------- nlattr->nla_len --------------> + */ + +struct nlattr { + __u16 nla_len; + __u16 nla_type; +}; + +/* + * nla_type (16 bits) + * +---+---+-------------------------------+ + * | N | O | Attribute Type | + * +---+---+-------------------------------+ + * N := Carries nested attributes + * O := Payload stored in network byte order + * + * Note: The N and O flag are mutually exclusive. + */ +#define NLA_F_NESTED (1 << 15) +#define NLA_F_NET_BYTEORDER (1 << 14) +#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) + +#define NLA_ALIGNTO 4 +#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) +#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) + +#ifdef __KERNEL__ + +#include +#include + +struct net; + +static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) +{ + return (struct nlmsghdr *)skb->data; +} + +struct netlink_skb_parms { + struct ucred creds; /* Skb credentials */ + __u32 pid; + __u32 dst_group; + kernel_cap_t eff_cap; + __u32 loginuid; /* Login (audit) uid */ + __u32 sessionid; /* Session id (audit) */ + __u32 sid; /* SELinux security id */ +}; + +#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) +#define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) + + +extern void netlink_table_grab(void); +extern void netlink_table_ungrab(void); + +extern struct sock *netlink_kernel_create(struct net *net, + int unit,unsigned int groups, + void (*input)(struct sk_buff *skb), + struct mutex *cb_mutex, + struct module *module); +extern void netlink_kernel_release(struct sock *sk); +extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups); +extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); +extern void __netlink_clear_multicast_users(struct sock *sk, unsigned int group); +extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); +extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); +extern int netlink_has_listeners(struct sock *sk, unsigned int group); +extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); +extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, + __u32 group, gfp_t allocation); +extern int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, + __u32 pid, __u32 group, gfp_t allocation, + int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), + void *filter_data); +extern int netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); +extern int netlink_register_notifier(struct notifier_block *nb); +extern int netlink_unregister_notifier(struct notifier_block *nb); + +/* finegrained unicast helpers: */ +struct sock *netlink_getsockbyfilp(struct file *filp); +int netlink_attachskb(struct sock *sk, struct sk_buff *skb, + long *timeo, struct sock *ssk); +void netlink_detachskb(struct sock *sk, struct sk_buff *skb); +int netlink_sendskb(struct sock *sk, struct sk_buff *skb); + +/* + * skb should fit one page. This choice is good for headerless malloc. + * But we should limit to 8K so that userspace does not have to + * use enormous buffer sizes on recvmsg() calls just to avoid + * MSG_TRUNC when PAGE_SIZE is very large. + */ +#if PAGE_SIZE < 8192UL +#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) +#else +#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) +#endif + +#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) + + +struct netlink_callback { + struct sk_buff *skb; + const struct nlmsghdr *nlh; + int (*dump)(struct sk_buff * skb, + struct netlink_callback *cb); + int (*done)(struct netlink_callback *cb); + int family; + long args[6]; +}; + +struct netlink_notify { + struct net *net; + int pid; + int protocol; +}; + +static __inline__ struct nlmsghdr * +__nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) +{ + struct nlmsghdr *nlh; + int size = NLMSG_LENGTH(len); + + nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); + nlh->nlmsg_type = type; + nlh->nlmsg_len = size; + nlh->nlmsg_flags = flags; + nlh->nlmsg_pid = pid; + nlh->nlmsg_seq = seq; + if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) + memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); + return nlh; +} + +#define NLMSG_NEW(skb, pid, seq, type, len, flags) \ +({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \ + goto nlmsg_failure; \ + __nlmsg_put(skb, pid, seq, type, len, flags); }) + +#define NLMSG_PUT(skb, pid, seq, type, len) \ + NLMSG_NEW(skb, pid, seq, type, len, 0) + +extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + int (*dump)(struct sk_buff *skb, struct netlink_callback*), + int (*done)(struct netlink_callback*)); + + +#define NL_NONROOT_RECV 0x1 +#define NL_NONROOT_SEND 0x2 +extern void netlink_set_nonroot(int protocol, unsigned flag); + +#endif /* __KERNEL__ */ + +#endif /* __LINUX_NETLINK_H */ -- cgit v1.2.3