Merge with Linux 2.1.72, part 2.

The new signal code with exception of the code for the rt signals.
The definitions in <asm/siginfo.h> and <asm/ucontext.h> are currently
just stolen from the Alpha and will need to be overhauled.

1 files changed, 555 insertions, 0 deletions

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
new file mode 100644
index 000000000..01f60fb24
--- /dev/null
+++ b/include/linux/rtnetlink.h
@@ -0,0 +1,555 @@
+#ifndef __LINUX_RTNETLINK_H
+#define __LINUX_RTNETLINK_H
+
+#include <linux/config.h>
+#include <linux/netlink.h>
+
+#define RTNL_DEBUG 1
+
+
+/****
+ *		Routing/neighbour discovery messages.
+ ****/
+
+/* Types of messages */
+
+#define RTM_BASE	0x10
+
+#define	RTM_NEWLINK	(RTM_BASE+0)
+#define	RTM_DELLINK	(RTM_BASE+1)
+#define	RTM_GETLINK	(RTM_BASE+2)
+
+#define	RTM_NEWADDR	(RTM_BASE+4)
+#define	RTM_DELADDR	(RTM_BASE+5)
+#define	RTM_GETADDR	(RTM_BASE+6)
+
+#define	RTM_NEWROUTE	(RTM_BASE+8)
+#define	RTM_DELROUTE	(RTM_BASE+9)
+#define	RTM_GETROUTE	(RTM_BASE+10)
+
+#define	RTM_NEWNEIGH	(RTM_BASE+12)
+#define	RTM_DELNEIGH	(RTM_BASE+13)
+#define	RTM_GETNEIGH	(RTM_BASE+14)
+
+#define	RTM_NEWRULE	(RTM_BASE+16)
+#define	RTM_DELRULE	(RTM_BASE+17)
+#define	RTM_GETRULE	(RTM_BASE+18)
+
+#define	RTM_MAX		(RTM_BASE+19)
+
+
+/* Generic structure for encapsulation optional route
+   information. It is reminiscent of sockaddr, but with sa_family
+   replaced with attribute type.
+   It would be good, if constructions of sort:
+   struct something {
+     struct rtattr rta;
+     struct a_content a;
+   }
+   had correct alignment. It is true for x86, but I have no idea
+   how to make it on 64bit architectures. Please, teach me. --ANK
+ */
+
+struct rtattr
+{
+	unsigned short	rta_len;
+	unsigned short	rta_type;
+/*
+	unsigned char	rta_data[0];
+ */
+};
+
+enum rtattr_type_t
+{
+	RTA_UNSPEC,
+	RTA_DST,
+	RTA_SRC,
+	RTA_IIF,
+	RTA_OIF,
+	RTA_GATEWAY,
+	RTA_PRIORITY,
+	RTA_PREFSRC,
+	RTA_WINDOW,
+	RTA_RTT,
+	RTA_MTU,
+	RTA_IFNAME
+};
+
+#define RTA_MAX RTA_IFNAME
+
+/* Macros to handle rtattributes */
+
+#define RTA_ALIGNTO	4
+#define RTA_ALIGN(len) ( ((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1) )
+#define RTA_OK(rta,len) ((rta)->rta_len > sizeof(struct rtattr) && \
+			 (rta)->rta_len <= (len))
+#define RTA_NEXT(rta,attrlen)	((attrlen) -= RTA_ALIGN((rta)->rta_len), \
+				 (struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
+#define RTA_LENGTH(len)	(RTA_ALIGN(sizeof(struct rtattr)) + (len))
+#define RTA_SPACE(len)	RTA_ALIGN(RTA_LENGTH(len))
+#define RTA_DATA(rta)   ((void*)(((char*)(rta)) + RTA_LENGTH(0)))
+
+
+/*
+ * "struct rtnexthop" describres all necessary nexthop information,
+ * i.e. parameters of path to a destination via this nextop.
+ *
+ * At the moment it is impossible to set different prefsrc, mtu, window
+ * and rtt for different paths from multipath.
+ */
+
+struct rtnexthop
+{
+	unsigned short		rtnh_len;
+	unsigned char		rtnh_flags;
+	unsigned char		rtnh_hops;
+	int			rtnh_ifindex;
+/*
+	struct rtattr		rtnh_data[0];
+ */
+};
+
+/* rtnh_flags */
+
+#define RTNH_F_DEAD		1	/* Nexthop is dead (used by multipath)	*/
+#define RTNH_F_PERVASIVE	2	/* Do recursive gateway lookup	*/
+#define RTNH_F_ONLINK		4	/* Gateway is forced on link	*/
+
+/* Macros to handle hexthops */
+
+#define RTNH_ALIGNTO	4
+#define RTNH_ALIGN(len) ( ((len)+RTNH_ALIGNTO-1) & ~(RTNH_ALIGNTO-1) )
+#define RTNH_OK(rtnh,len) ((rtnh)->rtnh_len >= sizeof(struct rtnexthop) && \
+			   (rtnh)->rtnh_len <= (len))
+#define RTNH_NEXT(rtnh)	((struct rtnexthop*)(((char*)(rtnh)) + RTNH_ALIGN((rtnh)->rtnh_len)))
+#define RTNH_LENGTH(len) (RTNH_ALIGN(sizeof(struct rtnexthop)) + (len))
+#define RTNH_SPACE(len)	RTNH_ALIGN(RTNH_LENGTH(len))
+#define RTNH_DATA(rtnh)   ((struct rtattr*)(((char*)(rtnh)) + RTNH_LENGTH(0)))
+
+
+struct rtmsg
+{
+	unsigned char		rtm_family;
+	unsigned char		rtm_dst_len;
+	unsigned char		rtm_src_len;
+	unsigned char		rtm_tos;
+	unsigned char		rtm_table;	/* Routing table id */
+	unsigned char		rtm_protocol;	/* Routing protocol; see below	*/
+	unsigned char		rtm_nhs;	/* Number of nexthops */
+	unsigned char		rtm_type;	/* See below	*/
+	unsigned short		rtm_optlen;	/* Byte length of rtm_opt */
+	unsigned char		rtm_scope;	/* See below */	
+	unsigned char		rtm_whatsit;	/* Unused byte */
+	unsigned		rtm_flags;
+/*
+	struct rtattr		rtm_opt[0];
+	struct rtnexthop	rtm_nh[0];
+ */
+};
+
+#define RTM_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
+#define RTM_RTNH(r) ((struct rtnexthop*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg)) \
+					   + NLMSG_ALIGN((r)->rtm_optlen)))
+#define RTM_NHLEN(nlh,r) ((nlh)->nlmsg_len - NLMSG_SPACE(sizeof(struct rtmsg)) - NLMSG_ALIGN((r)->rtm_optlen))
+
+/* rtm_type */
+
+enum
+{
+	RTN_UNSPEC,
+	RTN_UNICAST,		/* Gateway or direct route	*/
+	RTN_LOCAL,		/* Accept locally		*/
+	RTN_BROADCAST,		/* Accept locally as broadcast,
+				   send as broadcast */
+	RTN_ANYCAST,		/* Accept locally as broadcast,
+				   but send as unicast */
+	RTN_MULTICAST,		/* Multicast route		*/
+	RTN_BLACKHOLE,		/* Drop				*/
+	RTN_UNREACHABLE,	/* Destination is unreachable   */
+	RTN_PROHIBIT,		/* Administratively prohibited	*/
+	RTN_THROW,		/* Not in this table		*/
+	RTN_NAT,		/* Translate this address	*/
+	RTN_XRESOLVE,		/* Use external resolver	*/
+};
+
+#define RTN_MAX RTN_XRESOLVE
+
+/* rtm_protocol */
+
+#define RTPROT_UNSPEC	0
+#define RTPROT_REDIRECT	1	/* Route installed by ICMP redirects;
+				   not used by current IPv4 */
+#define RTPROT_KERNEL	2	/* Route installed by kernel		*/
+#define RTPROT_BOOT	3	/* Route installed during boot		*/
+#define RTPROT_STATIC	4	/* Route installed by administrator	*/
+
+/* Values of protocol >= RTPROT_STATIC are not interpreted by kernel;
+   they just passed from user and back as is.
+   It will be used by hypothetical multiple routing daemons.
+   Note that protocol values should be standardized in order to
+   avoid conflicts.
+ */
+
+#define RTPROT_GATED	8	/* Apparently, GateD */
+#define RTPROT_RA	9	/* RDISC router advertisment */
+
+
+/* rtm_scope
+
+   Really it is not scope, but sort of distance to the destination.
+   NOWHERE are reserved for not existing destinations, HOST is our
+   local addresses, LINK are destinations, locate on directly attached
+   link and UNIVERSE is everywhere in the Universe :-)
+
+   Intermediate values are also possible f.e. interior routes
+   could be assigned a value between UNIVERSE and LINK.
+*/
+
+enum rt_scope_t
+{
+	RT_SCOPE_UNIVERSE=0,
+/* User defined values f.e. "site" */
+	RT_SCOPE_LINK=253,
+	RT_SCOPE_HOST=254,
+	RT_SCOPE_NOWHERE=255
+};
+
+/* rtm_flags */
+
+#define RTM_F_NOTIFY		0x100	/* Notify user of route change	*/
+#define RTM_F_CLONED		0x200	/* This route is cloned		*/
+#define RTM_F_NOPMTUDISC	0x400	/* Do not make PMTU discovery	*/
+#define RTM_F_EQUALIZE		0x800	/* Multipath equalizer: NI	*/
+
+/* Reserved table identifiers */
+
+enum rt_class_t
+{
+	RT_TABLE_UNSPEC=0,
+/* User defined values */
+	RT_TABLE_DEFAULT=253,
+	RT_TABLE_MAIN=254,
+	RT_TABLE_LOCAL=255
+};
+#define RT_TABLE_MAX RT_TABLE_LOCAL
+
+
+/*********************************************************
+ *		Interface address.
+ ****/
+
+struct ifaddrmsg
+{
+	unsigned char	ifa_family;
+	unsigned char	ifa_prefixlen;	/* The prefix length		*/
+	unsigned char	ifa_flags;	/* Flags			*/
+	unsigned char	ifa_scope;	/* See above			*/
+	int		ifa_index;	/* Link index			*/
+/*
+	struct rtattr	ifa_data[0];
+ */
+};
+
+enum
+{
+	IFA_UNSPEC,
+	IFA_ADDRESS,
+	IFA_LOCAL,
+	IFA_LABEL,
+	IFA_BROADCAST,
+	IFA_ANYCAST
+};
+
+#define IFA_MAX IFA_ANYCAST
+
+/* ifa_flags */
+
+#define IFA_F_SECONDARY	1
+
+
+#define IFA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
+
+/*
+   Important comment:
+   IFA_ADDRESS is prefix address, rather than local interface address.
+   It makes no difference for normally configured broadcast interfaces,
+   but for point-to-point IFA_ADDRESS is DESTINATION address,
+   local address is supplied in IFA_LOCAL attribute.
+ */
+
+/**************************************************************
+ *		Neighbour discovery.
+ ****/
+
+struct ndmsg
+{
+	unsigned char	nd_family;
+	int		nd_ifindex;	/* Link index			*/
+	unsigned	nd_flags;
+/*
+	struct rtattr	nd_data[0];
+ */
+};
+
+enum
+{
+	NDA_UNSPEC,
+	NDA_DST,
+	NDA_LLADDR,
+};
+
+#define NDA_MAX NDA_LLADDR
+
+#define NDA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
+
+/****
+ *		General form of address family dependent message.
+ ****/
+
+struct rtgenmsg
+{
+	unsigned char		rtgen_family;
+};
+
+/*****************************************************************
+ *		Link layer specific messages.
+ ****/
+
+/* struct ifinfomsg
+ * passes link level specific information, not dependent
+ * on network protocol.
+ */
+
+struct ifinfomsg
+{
+	unsigned char	ifi_family;		/* Dummy	*/
+	unsigned char	ifi_addrlen;		/* Length of HW address */
+	unsigned short	ifi_pad__;
+	int		ifi_index;		/* Link index	*/
+	int		ifi_link;		/* Physical device */
+	char		ifi_name[IFNAMSIZ];
+	struct sockaddr	ifi_address;		/* HW address	*/
+	struct sockaddr	ifi_broadcast;		/* HW broadcast	*/
+	unsigned	ifi_flags;		/* IFF_* flags	*/
+	int		ifi_mtu;		/* Link mtu	*/
+	char		ifi_qdiscname[IFNAMSIZ];/* Id of packet scheduler */
+	int		ifi_qdisc;		/* Packet scheduler handle */
+};
+
+/* ifi_flags.
+
+   IFF_* flags.
+
+   The only change is:
+   IFF_LOOPBACK, IFF_BROADCAST and IFF_POINTOPOINT are
+   more not changeable by user. They describe link media
+   characteristics and set by device driver.
+
+   Comments:
+   - Combination IFF_BROADCAST|IFF_POINTOPOINT is invalid
+   - If neiher of these three flags are set;
+     the interface is NBMA.
+
+   - IFF_MULTICAST does not mean anything special:
+   multicasts can be used on all not-NBMA links.
+   IFF_MULTICAST means that this media uses special encapsulation
+   for multicast frames. Apparently, all IFF_POINTOPOINT and
+   IFF_BROADCAST devices are able to use multicasts too.
+ */
+
+/* ifi_link.
+   For usual devices it is equal ifi_index.
+   If it is a "virtual interface" (f.e. tunnel), ifi_link
+   can point to real physical interface (f.e. for bandwidth calculations),
+   or maybe 0, what means, that real media is unknown (usual
+   for IPIP tunnels, when route to endpoint is allowed to change)
+ */
+
+#define RTMGRP_LINK		1
+#define RTMGRP_NOTIFY		2
+
+#define RTMGRP_IPV4_IFADDR	0x10
+#define RTMGRP_IPV4_NDISC	0x20
+#define RTMGRP_IPV4_ROUTE	0x40
+#define RTMGRP_IPV4_MROUTE	0x80
+
+#define RTMGRP_IPV6_IFADDR	0x100
+#define RTMGRP_IPV6_NDISC	0x200
+#define RTMGRP_IPV6_ROUTE	0x400
+#define RTMGRP_IPV6_MROUTE	0x800
+
+
+#ifdef __KERNEL__
+
+struct kern_rta
+{
+	void		*rta_dst;
+	void		*rta_src;
+	int		*rta_iif;
+	int		*rta_oif;
+	void		*rta_gw;
+	u32		*rta_priority;
+	void		*rta_prefsrc;
+	unsigned	*rta_window;
+	unsigned	*rta_rtt;
+	unsigned	*rta_mtu;
+	unsigned char	*rta_ifname;
+};
+
+struct kern_ifa
+{
+	void		*ifa_address;
+	void		*ifa_local;
+	unsigned char	*ifa_label;
+	void		*ifa_broadcast;
+	void		*ifa_anycast;
+};
+
+
+extern atomic_t rtnl_rlockct;
+extern struct wait_queue *rtnl_wait;
+
+#ifdef CONFIG_RTNETLINK
+extern struct sock *rtnl;
+
+struct rtnetlink_link
+{
+	int (*doit)(struct sk_buff *, struct nlmsghdr*, void *attr);
+	int (*dumpit)(struct sk_buff *, struct netlink_callback *cb);
+};
+
+extern struct rtnetlink_link * rtnetlink_links[NPROTO];
+extern int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb);
+
+
+extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
+
+#define RTA_PUT(skb, attrtype, attrlen, data) \
+({ if (skb_tailroom(skb) < RTA_SPACE(attrlen)) goto rtattr_failure; \
+   __rta_fill(skb, attrtype, attrlen, data); })
+
+extern unsigned long rtnl_wlockct;
+
+/* NOTE: these locks are not interrupt safe, are not SMP safe,
+ * they are even not atomic. 8)8)8) ... and it is not a bug.
+ * Really, if these locks will be programmed correctly,
+ * all the addressing/routing machine would become SMP safe,
+ * but is absolutely useless at the moment, because all the kernel
+ * is not reenterable in any case. --ANK
+ *
+ * Well, atomic_* and set_bit provide the only thing here:
+ * gcc is confused not to overoptimize them, that's all.
+ * I remember as gcc splitted ++ operation, but cannot reproduce
+ * it with gcc-2.7.*. --ANK
+ *
+ * One more note: rwlock facility should be written and put
+ * to a kernel wide location: f.e. current implementation of semaphores
+ * (especially, for x86) looks like a wonder. It would be good
+ * to have something similar for rwlock. Recursive lock could be also
+ * useful thing. --ANK
+ */
+
+extern __inline__ int rtnl_shlock_nowait(void)
+{
+	atomic_inc(&rtnl_rlockct);
+	if (test_bit(0, &rtnl_wlockct)) {
+		atomic_dec(&rtnl_rlockct);
+		return -EAGAIN;
+	}
+	return 0;
+}
+
+extern __inline__ void rtnl_shlock(void)
+{
+	while (rtnl_shlock_nowait())
+		sleep_on(&rtnl_wait);
+}
+
+/* Check for possibility to PROMOTE shared lock to exclusive.
+   Shared lock must be already grabbed with rtnl_shlock*().
+ */
+
+extern __inline__ int rtnl_exlock_nowait(void)
+{
+	if (atomic_read(&rtnl_rlockct) > 1)
+		return -EAGAIN;
+	if (test_and_set_bit(0, &rtnl_wlockct))
+		return -EAGAIN;
+	return 0;
+}
+
+extern __inline__ void rtnl_exlock(void)
+{
+	while (rtnl_exlock_nowait())
+		sleep_on(&rtnl_wait);
+}
+
+#if 0
+extern __inline__ void rtnl_shunlock(void)
+{
+	atomic_dec(&rtnl_rlockct);
+	if (atomic_read(&rtnl_rlockct) <= 1) {
+		wake_up(&rtnl_wait);
+		if (rtnl->receive_queue.qlen)
+			rtnl->data_ready(rtnl, 0);
+	}
+}
+#else
+
+/* The problem: inline requires to include <net/sock.h> and, hence,
+   almost all of net includes :-(
+ */
+
+#define rtnl_shunlock() ({ \
+	atomic_dec(&rtnl_rlockct); \
+	if (atomic_read(&rtnl_rlockct) <= 1) { \
+		wake_up(&rtnl_wait); \
+		if (rtnl->receive_queue.qlen) \
+			rtnl->data_ready(rtnl, 0); \
+	} \
+})
+#endif
+
+/* Release exclusive lock. Note, that we do not wake up rtnetlink socket,
+ * it will be done later after releasing shared lock.
+ */
+
+extern __inline__ void rtnl_exunlock(void)
+{
+	clear_bit(0, &rtnl_wlockct);
+	wake_up(&rtnl_wait);
+}
+
+#else
+
+extern __inline__ void rtnl_shlock(void)
+{
+	while (atomic_read(&rtnl_rlockct))
+		sleep_on(&rtnl_wait);
+	atomic_inc(&rtnl_rlockct);
+}
+
+extern __inline__ void rtnl_shunlock(void)
+{
+	if (atomic_dec_and_test(&rtnl_rlockct))
+		wake_up(&rtnl_wait);
+}
+
+extern __inline__ void rtnl_exlock(void)
+{
+}
+
+extern __inline__ void rtnl_exunlock(void)
+{
+}
+
+#endif
+
+extern void rtnl_lock(void);
+extern void rtnl_unlock(void);
+extern void rtnetlink_init(void);
+
+#endif /* __KERNEL__ */
+
+
+#endif	/* __LINUX_RTNETLINK_H */