#ifndef __LINUX_RTNETLINK_H #define __LINUX_RTNETLINK_H #include #include #define RTNL_DEBUG 1 /* #define CONFIG_RTNL_OLD_IFINFO 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) ((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) ((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 */ #ifdef CONFIG_RTNL_OLD_IFINFO unsigned char rtm_nhs; /* Number of nexthops */ #else unsigned char rtm_scope; /* See below */ #endif unsigned char rtm_type; /* See below */ #ifdef CONFIG_RTNL_OLD_IFINFO unsigned short rtm_optlen; /* Byte length of rtm_opt */ unsigned char rtm_scope; /* See below */ unsigned char rtm_whatsit; /* Unused byte */ #endif 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 */ /* 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 */ #ifdef CONFIG_RTNL_OLD_IFINFO #define RTM_F_NOPMTUDISC 0x800 /* Do not make PMTU discovery */ #endif /* 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, #ifndef CONFIG_RTNL_OLD_IFINFO RTA_METRICS, RTA_MULTIPATH, RTA_PROTOINFO, RTA_FLOW, #else RTA_WINDOW, RTA_RTT, RTA_MTU, RTA_IFNAME, #endif 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) && \ (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))) #ifdef CONFIG_RTNL_OLD_IFINFO #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)) #endif /* RTM_CACHEINFO */ struct rta_cacheinfo { __u32 rta_clntref; __u32 rta_lastuse; __s32 rta_expires; __u32 rta_error; __u32 rta_used; }; /* RTM_METRICS --- array of struct rtattr with types of RTAX_* */ enum { RTAX_UNSPEC, RTAX_LOCK, RTAX_MTU, RTAX_WINDOW, RTAX_RTT, RTAX_HOPS, RTAX_SSTHRESH, RTAX_CWND, }; #define RTAX_MAX RTAX_CWND /********************************************************* * 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. */ #ifdef CONFIG_RTNL_OLD_IFINFO 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 */ }; enum { IFLA_UNSPEC, IFLA_ADDRESS, IFLA_BROADCAST, IFLA_IFNAME, IFLA_QDISC, IFLA_STATS }; #else 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 }; #endif #define IFLA_MAX IFLA_STATS #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. */ /* 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) */ /***************************************************************** * 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 /* End of information exported to user level */ #ifdef __KERNEL__ extern atomic_t rtnl_rlockct; extern struct wait_queue *rtnl_wait; extern __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); #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 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo); 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 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 && rtnl->receive_queue.qlen) rtnl->data_ready(rtnl, 0); } } #else /* The problem: inline requires to include 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 && 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 */