598 lines
14 KiB
C
Executable File
598 lines
14 KiB
C
Executable File
#ifndef __LINUX_RTNETLINK_H
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#define __LINUX_RTNETLINK_H
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#include <linux/netlink.h>
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#define RTNL_DEBUG 1
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/****
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* Routing/neighbour discovery messages.
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****/
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/* Types of messages */
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#define RTM_BASE 0x10
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#define RTM_NEWLINK (RTM_BASE+0)
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#define RTM_DELLINK (RTM_BASE+1)
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#define RTM_GETLINK (RTM_BASE+2)
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#define RTM_NEWADDR (RTM_BASE+4)
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#define RTM_DELADDR (RTM_BASE+5)
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#define RTM_GETADDR (RTM_BASE+6)
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#define RTM_NEWROUTE (RTM_BASE+8)
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#define RTM_DELROUTE (RTM_BASE+9)
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#define RTM_GETROUTE (RTM_BASE+10)
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#define RTM_NEWNEIGH (RTM_BASE+12)
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#define RTM_DELNEIGH (RTM_BASE+13)
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#define RTM_GETNEIGH (RTM_BASE+14)
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#define RTM_NEWRULE (RTM_BASE+16)
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#define RTM_DELRULE (RTM_BASE+17)
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#define RTM_GETRULE (RTM_BASE+18)
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#define RTM_NEWQDISC (RTM_BASE+20)
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#define RTM_DELQDISC (RTM_BASE+21)
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#define RTM_GETQDISC (RTM_BASE+22)
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#define RTM_NEWTCLASS (RTM_BASE+24)
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#define RTM_DELTCLASS (RTM_BASE+25)
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#define RTM_GETTCLASS (RTM_BASE+26)
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#define RTM_NEWTFILTER (RTM_BASE+28)
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#define RTM_DELTFILTER (RTM_BASE+29)
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#define RTM_GETTFILTER (RTM_BASE+30)
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#define RTM_MAX (RTM_BASE+31)
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/*
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Generic structure for encapsulation optional route information.
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It is reminiscent of sockaddr, but with sa_family replaced
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with attribute type.
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*/
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struct rtattr
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{
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unsigned short rta_len;
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unsigned short rta_type;
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};
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/* Macros to handle rtattributes */
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#define RTA_ALIGNTO 4
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#define RTA_ALIGN(len) ( ((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1) )
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#define RTA_OK(rta,len) ((len) > 0 && (rta)->rta_len >= sizeof(struct rtattr) && \
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(rta)->rta_len <= (len))
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#define RTA_NEXT(rta,attrlen) ((attrlen) -= RTA_ALIGN((rta)->rta_len), \
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(struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
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#define RTA_LENGTH(len) (RTA_ALIGN(sizeof(struct rtattr)) + (len))
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#define RTA_SPACE(len) RTA_ALIGN(RTA_LENGTH(len))
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#define RTA_DATA(rta) ((void*)(((char*)(rta)) + RTA_LENGTH(0)))
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#define RTA_PAYLOAD(rta) ((int)((rta)->rta_len) - RTA_LENGTH(0))
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/******************************************************************************
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* Definitions used in routing table administation.
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****/
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struct rtmsg
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{
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unsigned char rtm_family;
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unsigned char rtm_dst_len;
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unsigned char rtm_src_len;
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unsigned char rtm_tos;
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unsigned char rtm_table; /* Routing table id */
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unsigned char rtm_protocol; /* Routing protocol; see below */
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unsigned char rtm_scope; /* See below */
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unsigned char rtm_type; /* See below */
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unsigned rtm_flags;
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};
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/* rtm_type */
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enum
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{
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RTN_UNSPEC,
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RTN_UNICAST, /* Gateway or direct route */
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RTN_LOCAL, /* Accept locally */
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RTN_BROADCAST, /* Accept locally as broadcast,
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send as broadcast */
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RTN_ANYCAST, /* Accept locally as broadcast,
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but send as unicast */
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RTN_MULTICAST, /* Multicast route */
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RTN_BLACKHOLE, /* Drop */
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RTN_UNREACHABLE, /* Destination is unreachable */
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RTN_PROHIBIT, /* Administratively prohibited */
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RTN_THROW, /* Not in this table */
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RTN_NAT, /* Translate this address */
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RTN_XRESOLVE, /* Use external resolver */
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};
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#define RTN_MAX RTN_XRESOLVE
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/* rtm_protocol */
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#define RTPROT_UNSPEC 0
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#define RTPROT_REDIRECT 1 /* Route installed by ICMP redirects;
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not used by current IPv4 */
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#define RTPROT_KERNEL 2 /* Route installed by kernel */
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#define RTPROT_BOOT 3 /* Route installed during boot */
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#define RTPROT_STATIC 4 /* Route installed by administrator */
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/* Values of protocol >= RTPROT_STATIC are not interpreted by kernel;
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they just passed from user and back as is.
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It will be used by hypothetical multiple routing daemons.
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Note that protocol values should be standardized in order to
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avoid conflicts.
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*/
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#define RTPROT_GATED 8 /* Apparently, GateD */
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#define RTPROT_RA 9 /* RDISC/ND router advertisments */
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#define RTPROT_MRT 10 /* Merit MRT */
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#define RTPROT_ZEBRA 11 /* Zebra */
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#define RTPROT_BIRD 12 /* BIRD */
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#define RTPROT_DNROUTED 13 /* DECnet routing daemon */
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/* rtm_scope
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Really it is not scope, but sort of distance to the destination.
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NOWHERE are reserved for not existing destinations, HOST is our
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local addresses, LINK are destinations, located on directly attached
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link and UNIVERSE is everywhere in the Universe.
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Intermediate values are also possible f.e. interior routes
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could be assigned a value between UNIVERSE and LINK.
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*/
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enum rt_scope_t
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{
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RT_SCOPE_UNIVERSE=0,
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/* User defined values */
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RT_SCOPE_SITE=200,
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RT_SCOPE_LINK=253,
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RT_SCOPE_HOST=254,
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RT_SCOPE_NOWHERE=255
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};
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/* rtm_flags */
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#define RTM_F_NOTIFY 0x100 /* Notify user of route change */
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#define RTM_F_CLONED 0x200 /* This route is cloned */
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#define RTM_F_EQUALIZE 0x400 /* Multipath equalizer: NI */
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/* Reserved table identifiers */
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enum rt_class_t
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{
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RT_TABLE_UNSPEC=0,
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/* User defined values */
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RT_TABLE_DEFAULT=253,
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RT_TABLE_MAIN=254,
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RT_TABLE_LOCAL=255
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};
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#define RT_TABLE_MAX RT_TABLE_LOCAL
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/* Routing message attributes */
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enum rtattr_type_t
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{
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RTA_UNSPEC,
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RTA_DST,
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RTA_SRC,
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RTA_IIF,
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RTA_OIF,
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RTA_GATEWAY,
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RTA_PRIORITY,
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RTA_PREFSRC,
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RTA_METRICS,
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RTA_MULTIPATH,
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RTA_PROTOINFO,
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RTA_FLOW,
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RTA_CACHEINFO
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};
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#define RTA_MAX RTA_CACHEINFO
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#define RTM_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
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#define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
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/* RTM_MULTIPATH --- array of struct rtnexthop.
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*
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* "struct rtnexthop" describres all necessary nexthop information,
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* i.e. parameters of path to a destination via this nextop.
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*
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* At the moment it is impossible to set different prefsrc, mtu, window
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* and rtt for different paths from multipath.
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*/
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struct rtnexthop
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{
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unsigned short rtnh_len;
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unsigned char rtnh_flags;
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unsigned char rtnh_hops;
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int rtnh_ifindex;
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};
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/* rtnh_flags */
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#define RTNH_F_DEAD 1 /* Nexthop is dead (used by multipath) */
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#define RTNH_F_PERVASIVE 2 /* Do recursive gateway lookup */
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#define RTNH_F_ONLINK 4 /* Gateway is forced on link */
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/* Macros to handle hexthops */
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#define RTNH_ALIGNTO 4
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#define RTNH_ALIGN(len) ( ((len)+RTNH_ALIGNTO-1) & ~(RTNH_ALIGNTO-1) )
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#define RTNH_OK(rtnh,len) ((rtnh)->rtnh_len >= sizeof(struct rtnexthop) && \
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((int)(rtnh)->rtnh_len) <= (len))
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#define RTNH_NEXT(rtnh) ((struct rtnexthop*)(((char*)(rtnh)) + RTNH_ALIGN((rtnh)->rtnh_len)))
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#define RTNH_LENGTH(len) (RTNH_ALIGN(sizeof(struct rtnexthop)) + (len))
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#define RTNH_SPACE(len) RTNH_ALIGN(RTNH_LENGTH(len))
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#define RTNH_DATA(rtnh) ((struct rtattr*)(((char*)(rtnh)) + RTNH_LENGTH(0)))
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/* RTM_CACHEINFO */
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struct rta_cacheinfo
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{
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__u32 rta_clntref;
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__u32 rta_lastuse;
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__s32 rta_expires;
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__u32 rta_error;
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__u32 rta_used;
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#define RTNETLINK_HAVE_PEERINFO 1
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__u32 rta_id;
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__u32 rta_ts;
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__u32 rta_tsage;
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};
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/* RTM_METRICS --- array of struct rtattr with types of RTAX_* */
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enum
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{
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RTAX_UNSPEC,
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#define RTAX_UNSPEC RTAX_UNSPEC
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RTAX_LOCK,
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#define RTAX_LOCK RTAX_LOCK
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RTAX_MTU,
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#define RTAX_MTU RTAX_MTU
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RTAX_WINDOW,
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#define RTAX_WINDOW RTAX_WINDOW
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RTAX_RTT,
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#define RTAX_RTT RTAX_RTT
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RTAX_RTTVAR,
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#define RTAX_RTTVAR RTAX_RTTVAR
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RTAX_SSTHRESH,
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#define RTAX_SSTHRESH RTAX_SSTHRESH
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RTAX_CWND,
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#define RTAX_CWND RTAX_CWND
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RTAX_ADVMSS,
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#define RTAX_ADVMSS RTAX_ADVMSS
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RTAX_REORDERING,
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#define RTAX_REORDERING RTAX_REORDERING
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};
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#define RTAX_MAX RTAX_REORDERING
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/*********************************************************
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* Interface address.
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****/
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struct ifaddrmsg
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{
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unsigned char ifa_family;
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unsigned char ifa_prefixlen; /* The prefix length */
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unsigned char ifa_flags; /* Flags */
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unsigned char ifa_scope; /* See above */
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int ifa_index; /* Link index */
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};
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enum
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{
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IFA_UNSPEC,
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IFA_ADDRESS,
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IFA_LOCAL,
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IFA_LABEL,
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IFA_BROADCAST,
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IFA_ANYCAST,
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IFA_CACHEINFO
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};
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#define IFA_MAX IFA_CACHEINFO
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/* ifa_flags */
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#define IFA_F_SECONDARY 0x01
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#define IFA_F_DEPRECATED 0x20
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#define IFA_F_TENTATIVE 0x40
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#define IFA_F_PERMANENT 0x80
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struct ifa_cacheinfo
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{
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__s32 ifa_prefered;
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__s32 ifa_valid;
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};
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#define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
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#define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
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/*
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Important comment:
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IFA_ADDRESS is prefix address, rather than local interface address.
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It makes no difference for normally configured broadcast interfaces,
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but for point-to-point IFA_ADDRESS is DESTINATION address,
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local address is supplied in IFA_LOCAL attribute.
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*/
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/**************************************************************
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* Neighbour discovery.
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****/
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struct ndmsg
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{
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unsigned char ndm_family;
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unsigned char ndm_pad1;
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unsigned short ndm_pad2;
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int ndm_ifindex; /* Link index */
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__u16 ndm_state;
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__u8 ndm_flags;
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__u8 ndm_type;
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};
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enum
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{
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NDA_UNSPEC,
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NDA_DST,
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NDA_LLADDR,
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NDA_CACHEINFO
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};
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#define NDA_MAX NDA_CACHEINFO
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#define NDA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
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#define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
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/*
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* Neighbor Cache Entry Flags
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*/
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#define NTF_PROXY 0x08 /* == ATF_PUBL */
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#define NTF_ROUTER 0x80
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/*
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* Neighbor Cache Entry States.
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*/
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#define NUD_INCOMPLETE 0x01
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#define NUD_REACHABLE 0x02
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#define NUD_STALE 0x04
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#define NUD_DELAY 0x08
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#define NUD_PROBE 0x10
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#define NUD_FAILED 0x20
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/* Dummy states */
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#define NUD_NOARP 0x40
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#define NUD_PERMANENT 0x80
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#define NUD_NONE 0x00
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struct nda_cacheinfo
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{
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__u32 ndm_confirmed;
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__u32 ndm_used;
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__u32 ndm_updated;
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__u32 ndm_refcnt;
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};
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/****
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* General form of address family dependent message.
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****/
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struct rtgenmsg
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{
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unsigned char rtgen_family;
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};
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/*****************************************************************
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* Link layer specific messages.
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****/
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/* struct ifinfomsg
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* passes link level specific information, not dependent
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* on network protocol.
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*/
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struct ifinfomsg
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{
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unsigned char ifi_family;
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unsigned char __ifi_pad;
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unsigned short ifi_type; /* ARPHRD_* */
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int ifi_index; /* Link index */
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unsigned ifi_flags; /* IFF_* flags */
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unsigned ifi_change; /* IFF_* change mask */
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};
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enum
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{
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IFLA_UNSPEC,
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IFLA_ADDRESS,
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IFLA_BROADCAST,
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IFLA_IFNAME,
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IFLA_MTU,
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IFLA_LINK,
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IFLA_QDISC,
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IFLA_STATS,
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IFLA_COST,
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#define IFLA_COST IFLA_COST
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IFLA_PRIORITY,
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#define IFLA_PRIORITY IFLA_PRIORITY
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IFLA_MASTER
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#define IFLA_MASTER IFLA_MASTER
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};
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#define IFLA_MAX IFLA_MASTER
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#define IFLA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
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#define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
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/* ifi_flags.
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IFF_* flags.
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The only change is:
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IFF_LOOPBACK, IFF_BROADCAST and IFF_POINTOPOINT are
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more not changeable by user. They describe link media
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characteristics and set by device driver.
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Comments:
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- Combination IFF_BROADCAST|IFF_POINTOPOINT is invalid
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- If neiher of these three flags are set;
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the interface is NBMA.
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- IFF_MULTICAST does not mean anything special:
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multicasts can be used on all not-NBMA links.
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IFF_MULTICAST means that this media uses special encapsulation
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for multicast frames. Apparently, all IFF_POINTOPOINT and
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IFF_BROADCAST devices are able to use multicasts too.
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*/
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/* IFLA_LINK.
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For usual devices it is equal ifi_index.
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If it is a "virtual interface" (f.e. tunnel), ifi_link
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can point to real physical interface (f.e. for bandwidth calculations),
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or maybe 0, what means, that real media is unknown (usual
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for IPIP tunnels, when route to endpoint is allowed to change)
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*/
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/*****************************************************************
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* Traffic control messages.
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****/
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struct tcmsg
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{
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unsigned char tcm_family;
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unsigned char tcm__pad1;
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unsigned short tcm__pad2;
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int tcm_ifindex;
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__u32 tcm_handle;
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__u32 tcm_parent;
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__u32 tcm_info;
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};
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enum
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{
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TCA_UNSPEC,
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TCA_KIND,
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TCA_OPTIONS,
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TCA_STATS,
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TCA_XSTATS,
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TCA_RATE,
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};
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#define TCA_MAX TCA_RATE
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#define TCA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcmsg))))
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#define TCA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcmsg))
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/* SUMMARY: maximal rtattr understood by kernel */
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#define RTATTR_MAX RTA_MAX
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/* RTnetlink multicast groups */
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#define RTMGRP_LINK 1
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#define RTMGRP_NOTIFY 2
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#define RTMGRP_NEIGH 4
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#define RTMGRP_TC 8
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#define RTMGRP_IPV4_IFADDR 0x10
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#define RTMGRP_IPV4_MROUTE 0x20
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#define RTMGRP_IPV4_ROUTE 0x40
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#define RTMGRP_IPV6_IFADDR 0x100
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#define RTMGRP_IPV6_MROUTE 0x200
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#define RTMGRP_IPV6_ROUTE 0x400
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#define RTMGRP_DECnet_IFADDR 0x1000
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#define RTMGRP_DECnet_ROUTE 0x4000
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/* End of information exported to user level */
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#ifdef __KERNEL__
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#include <linux/config.h>
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static __inline__ int rtattr_strcmp(struct rtattr *rta, char *str)
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{
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int len = strlen(str) + 1;
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return len > rta->rta_len || memcmp(RTA_DATA(rta), str, len);
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}
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extern int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len);
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extern struct sock *rtnl;
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struct rtnetlink_link
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{
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int (*doit)(struct sk_buff *, struct nlmsghdr*, void *attr);
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int (*dumpit)(struct sk_buff *, struct netlink_callback *cb);
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};
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extern struct rtnetlink_link * rtnetlink_links[NPROTO];
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extern int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb);
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extern int rtnetlink_send(struct sk_buff *skb, u32 pid, u32 group, int echo);
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extern int rtnetlink_put_metrics(struct sk_buff *skb, unsigned *metrics);
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extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
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#define RTA_PUT(skb, attrtype, attrlen, data) \
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({ if (skb_tailroom(skb) < (int)RTA_SPACE(attrlen)) goto rtattr_failure; \
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__rta_fill(skb, attrtype, attrlen, data); })
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extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);
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extern struct semaphore rtnl_sem;
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#define rtnl_exlock() do { } while(0)
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#define rtnl_exunlock() do { } while(0)
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#define rtnl_exlock_nowait() (0)
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#define rtnl_shlock() down(&rtnl_sem)
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#define rtnl_shlock_nowait() down_trylock(&rtnl_sem)
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#define rtnl_shunlock() do { up(&rtnl_sem); \
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if (rtnl && rtnl->receive_queue.qlen) \
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rtnl->data_ready(rtnl, 0); \
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} while(0)
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extern void rtnl_lock(void);
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extern void rtnl_unlock(void);
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extern void rtnetlink_init(void);
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#define ASSERT_RTNL() do { if (down_trylock(&rtnl_sem) == 0) { up(&rtnl_sem); \
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printk("RTNL: assertion failed at " __FILE__ "(%d):" __FUNCTION__ "\n", __LINE__); } \
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} while(0);
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#define BUG_TRAP(x) if (!(x)) { printk("KERNEL: assertion (" #x ") failed at " __FILE__ "(%d):" __FUNCTION__ "\n", __LINE__); }
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#endif /* __KERNEL__ */
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#endif /* __LINUX_RTNETLINK_H */
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