rtnetlink.h
上传用户:lgb322
上传日期:2013-02-24
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文件大小:14k
- #ifndef __LINUX_RTNETLINK_H
- #define __LINUX_RTNETLINK_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_NEWQDISC (RTM_BASE+20)
- #define RTM_DELQDISC (RTM_BASE+21)
- #define RTM_GETQDISC (RTM_BASE+22)
- #define RTM_NEWTCLASS (RTM_BASE+24)
- #define RTM_DELTCLASS (RTM_BASE+25)
- #define RTM_GETTCLASS (RTM_BASE+26)
- #define RTM_NEWTFILTER (RTM_BASE+28)
- #define RTM_DELTFILTER (RTM_BASE+29)
- #define RTM_GETTFILTER (RTM_BASE+30)
- #define RTM_MAX (RTM_BASE+31)
- /*
- Generic structure for encapsulation optional route information.
- It is reminiscent of sockaddr, but with sa_family replaced
- with attribute type.
- */
- struct rtattr
- {
- unsigned short rta_len;
- unsigned short rta_type;
- };
- /* Macros to handle rtattributes */
- #define RTA_ALIGNTO 4
- #define RTA_ALIGN(len) ( ((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1) )
- #define RTA_OK(rta,len) ((len) > 0 && (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)))
- #define RTA_PAYLOAD(rta) ((int)((rta)->rta_len) - RTA_LENGTH(0))
- /******************************************************************************
- * Definitions used in routing table administation.
- ****/
- 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_scope; /* See below */
- unsigned char rtm_type; /* See below */
- unsigned rtm_flags;
- };
- /* 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/ND router advertisments */
- #define RTPROT_MRT 10 /* Merit MRT */
- #define RTPROT_ZEBRA 11 /* Zebra */
- #define RTPROT_BIRD 12 /* BIRD */
- #define RTPROT_DNROUTED 13 /* DECnet routing daemon */
- /* 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, located 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 */
- RT_SCOPE_SITE=200,
- 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_EQUALIZE 0x400 /* 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
- /* Routing message attributes */
- enum rtattr_type_t
- {
- RTA_UNSPEC,
- RTA_DST,
- RTA_SRC,
- RTA_IIF,
- RTA_OIF,
- RTA_GATEWAY,
- RTA_PRIORITY,
- RTA_PREFSRC,
- RTA_METRICS,
- RTA_MULTIPATH,
- RTA_PROTOINFO,
- RTA_FLOW,
- RTA_CACHEINFO
- };
- #define RTA_MAX RTA_CACHEINFO
- #define RTM_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
- #define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
- /* RTM_MULTIPATH --- array of struct rtnexthop.
- *
- * "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;
- };
- /* 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) &&
- ((int)(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)))
- /* RTM_CACHEINFO */
- struct rta_cacheinfo
- {
- __u32 rta_clntref;
- __u32 rta_lastuse;
- __s32 rta_expires;
- __u32 rta_error;
- __u32 rta_used;
- #define RTNETLINK_HAVE_PEERINFO 1
- __u32 rta_id;
- __u32 rta_ts;
- __u32 rta_tsage;
- };
- /* RTM_METRICS --- array of struct rtattr with types of RTAX_* */
- enum
- {
- RTAX_UNSPEC,
- #define RTAX_UNSPEC RTAX_UNSPEC
- RTAX_LOCK,
- #define RTAX_LOCK RTAX_LOCK
- RTAX_MTU,
- #define RTAX_MTU RTAX_MTU
- RTAX_WINDOW,
- #define RTAX_WINDOW RTAX_WINDOW
- RTAX_RTT,
- #define RTAX_RTT RTAX_RTT
- RTAX_RTTVAR,
- #define RTAX_RTTVAR RTAX_RTTVAR
- RTAX_SSTHRESH,
- #define RTAX_SSTHRESH RTAX_SSTHRESH
- RTAX_CWND,
- #define RTAX_CWND RTAX_CWND
- RTAX_ADVMSS,
- #define RTAX_ADVMSS RTAX_ADVMSS
- RTAX_REORDERING,
- #define RTAX_REORDERING RTAX_REORDERING
- };
- #define RTAX_MAX RTAX_REORDERING
- /*********************************************************
- * 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 */
- };
- enum
- {
- IFA_UNSPEC,
- IFA_ADDRESS,
- IFA_LOCAL,
- IFA_LABEL,
- IFA_BROADCAST,
- IFA_ANYCAST,
- IFA_CACHEINFO
- };
- #define IFA_MAX IFA_CACHEINFO
- /* ifa_flags */
- #define IFA_F_SECONDARY 0x01
- #define IFA_F_DEPRECATED 0x20
- #define IFA_F_TENTATIVE 0x40
- #define IFA_F_PERMANENT 0x80
- struct ifa_cacheinfo
- {
- __s32 ifa_prefered;
- __s32 ifa_valid;
- };
- #define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
- #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,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 ndm_family;
- unsigned char ndm_pad1;
- unsigned short ndm_pad2;
- int ndm_ifindex; /* Link index */
- __u16 ndm_state;
- __u8 ndm_flags;
- __u8 ndm_type;
- };
- enum
- {
- NDA_UNSPEC,
- NDA_DST,
- NDA_LLADDR,
- NDA_CACHEINFO
- };
- #define NDA_MAX NDA_CACHEINFO
- #define NDA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
- #define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
- /*
- * Neighbor Cache Entry Flags
- */
- #define NTF_PROXY 0x08 /* == ATF_PUBL */
- #define NTF_ROUTER 0x80
- /*
- * Neighbor Cache Entry States.
- */
- #define NUD_INCOMPLETE 0x01
- #define NUD_REACHABLE 0x02
- #define NUD_STALE 0x04
- #define NUD_DELAY 0x08
- #define NUD_PROBE 0x10
- #define NUD_FAILED 0x20
- /* Dummy states */
- #define NUD_NOARP 0x40
- #define NUD_PERMANENT 0x80
- #define NUD_NONE 0x00
- struct nda_cacheinfo
- {
- __u32 ndm_confirmed;
- __u32 ndm_used;
- __u32 ndm_updated;
- __u32 ndm_refcnt;
- };
- /****
- * 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;
- unsigned char __ifi_pad;
- unsigned short ifi_type; /* ARPHRD_* */
- int ifi_index; /* Link index */
- unsigned ifi_flags; /* IFF_* flags */
- unsigned ifi_change; /* IFF_* change mask */
- };
- enum
- {
- IFLA_UNSPEC,
- IFLA_ADDRESS,
- IFLA_BROADCAST,
- IFLA_IFNAME,
- IFLA_MTU,
- IFLA_LINK,
- IFLA_QDISC,
- IFLA_STATS,
- IFLA_COST,
- #define IFLA_COST IFLA_COST
- IFLA_PRIORITY,
- #define IFLA_PRIORITY IFLA_PRIORITY
- IFLA_MASTER
- #define IFLA_MASTER IFLA_MASTER
- };
- #define IFLA_MAX IFLA_MASTER
- #define IFLA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
- #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
- /* 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.
- */
- /* IFLA_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)
- */
- /*****************************************************************
- * Traffic control messages.
- ****/
- struct tcmsg
- {
- unsigned char tcm_family;
- unsigned char tcm__pad1;
- unsigned short tcm__pad2;
- int tcm_ifindex;
- __u32 tcm_handle;
- __u32 tcm_parent;
- __u32 tcm_info;
- };
- enum
- {
- TCA_UNSPEC,
- TCA_KIND,
- TCA_OPTIONS,
- TCA_STATS,
- TCA_XSTATS,
- TCA_RATE,
- };
- #define TCA_MAX TCA_RATE
- #define TCA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcmsg))))
- #define TCA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcmsg))
- /* SUMMARY: maximal rtattr understood by kernel */
- #define RTATTR_MAX RTA_MAX
- /* RTnetlink multicast groups */
- #define RTMGRP_LINK 1
- #define RTMGRP_NOTIFY 2
- #define RTMGRP_NEIGH 4
- #define RTMGRP_TC 8
- #define RTMGRP_IPV4_IFADDR 0x10
- #define RTMGRP_IPV4_MROUTE 0x20
- #define RTMGRP_IPV4_ROUTE 0x40
- #define RTMGRP_IPV6_IFADDR 0x100
- #define RTMGRP_IPV6_MROUTE 0x200
- #define RTMGRP_IPV6_ROUTE 0x400
- #define RTMGRP_DECnet_IFADDR 0x1000
- #define RTMGRP_DECnet_ROUTE 0x4000
- /* End of information exported to user level */
- #ifdef __KERNEL__
- #include <linux/config.h>
- static __inline__ int rtattr_strcmp(struct rtattr *rta, char *str)
- {
- int len = strlen(str) + 1;
- return len > rta->rta_len || memcmp(RTA_DATA(rta), str, len);
- }
- extern int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len);
- 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 int rtnetlink_send(struct sk_buff *skb, u32 pid, u32 group, int echo);
- extern int rtnetlink_put_metrics(struct sk_buff *skb, unsigned *metrics);
- 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) < (int)RTA_SPACE(attrlen)) goto rtattr_failure;
- __rta_fill(skb, attrtype, attrlen, data); })
- extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);
- extern struct semaphore rtnl_sem;
- #define rtnl_exlock() do { } while(0)
- #define rtnl_exunlock() do { } while(0)
- #define rtnl_exlock_nowait() (0)
- #define rtnl_shlock() down(&rtnl_sem)
- #define rtnl_shlock_nowait() down_trylock(&rtnl_sem)
- #define rtnl_shunlock() do { up(&rtnl_sem);
- if (rtnl && rtnl->receive_queue.qlen)
- rtnl->data_ready(rtnl, 0);
- } while(0)
- extern void rtnl_lock(void);
- extern void rtnl_unlock(void);
- extern void rtnetlink_init(void);
- #define ASSERT_RTNL() do { if (down_trylock(&rtnl_sem) == 0) { up(&rtnl_sem);
- printk("RTNL: assertion failed at " __FILE__ "(%d)n", __LINE__); }
- } while(0);
- #define BUG_TRAP(x) if (!(x)) { printk("KERNEL: assertion (" #x ") failed at " __FILE__ "(%d)n", __LINE__); }
- #endif /* __KERNEL__ */
- #endif /* __LINUX_RTNETLINK_H */