943478b00f
Add basic VRF (virtual routing and forwarding) support. Protocols can be associated with VRFs, such protocols will be restricted to interfaces assigned to the VRF (as reported by Linux kernel) and will use sockets bound to the VRF. E.g., different multihop BGP instances can use diffent kernel routing tables to handle BGP TCP connections. The VRF support is preliminary, currently there are several limitations: - Recent Linux kernels (4.11) do not handle correctly sockets bound to interaces that are part of VRF, so most protocols other than multihop BGP do not work. This will be fixed by future kernel versions. - Neighbor cache ignores VRFs. Breaks config with the same prefix on local interfaces in different VRFs. Not much problem as single hop protocols do not work anyways. - Olock code ignores VRFs. Breaks config with multiple BGP peers with the same IP address in different VRFs. - Incoming BGP connections are not dispatched according to VRFs. Breaks config with multiple BGP peers with the same IP address in different VRFs. Perhaps we would need some kernel API to read VRF of incoming connection? Or probably use multiple listening sockets in int-new branch. - We should handle master VRF interface up/down events and perhaps disable associated protocols when VRF goes down. Or at least disable associated interfaces. - Also we should check if the master iface is really VRF iface and not some other kind of master iface. - BFD session request dispatch should be aware of VRFs. - Perhaps kernel protocol should read default kernel table ID from VRF iface so it is not necessary to configure it. - Perhaps we should have per-VRF default table.
171 lines
5.4 KiB
C
171 lines
5.4 KiB
C
/*
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* BIRD Internet Routing Daemon -- Network Interfaces
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*
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* (c) 1998--2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_IFACE_H_
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#define _BIRD_IFACE_H_
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#include "lib/lists.h"
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extern list iface_list;
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struct proto;
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struct pool;
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struct ifa { /* Interface address */
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node n;
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struct iface *iface; /* Interface this address belongs to */
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ip_addr ip; /* IP address of this host */
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ip_addr prefix; /* Network prefix */
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unsigned pxlen; /* Prefix length */
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ip_addr brd; /* Broadcast address */
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ip_addr opposite; /* Opposite end of a point-to-point link */
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unsigned scope; /* Interface address scope */
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unsigned flags; /* Analogous to iface->flags */
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};
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struct iface {
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node n;
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char name[16];
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unsigned flags;
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unsigned mtu;
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unsigned index; /* OS-dependent interface index */
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unsigned master_index; /* Interface index of master iface */
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list addrs; /* Addresses assigned to this interface */
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struct ifa *addr; /* Primary address */
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struct iface *master; /* Master iface (e.g. for VRF) */
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list neighbors; /* All neighbors on this interface */
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};
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#define IF_UP 1 /* IF_ADMIN_UP and IP address known */
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#define IF_MULTIACCESS 2
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#define IF_BROADCAST 4
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#define IF_MULTICAST 8
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#define IF_SHUTDOWN 0x10 /* Interface disappeared */
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#define IF_LOOPBACK 0x20
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#define IF_IGNORE 0x40 /* Not to be used by routing protocols (loopbacks etc.) */
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#define IF_ADMIN_UP 0x80 /* Administrative up (e.g. IFF_UP in Linux) */
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#define IF_LINK_UP 0x100 /* Link available (e.g. IFF_LOWER_UP in Linux) */
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#define IA_PRIMARY 0x10000 /* This address is primary */
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#define IA_SECONDARY 0x20000 /* This address has been reported as secondary by the kernel */
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#define IA_PEER 0x40000 /* A peer/ptp address */
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#define IA_HOST 0x80000 /* A host/loopback address */
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#define IA_FLAGS 0xff0000
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/*
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* There are three kinds of addresses in BIRD:
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* - Standard (prefix-based) addresses, these may define ifa.opposite (for /30 or /31).
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* - Peer/ptp addresses, without common prefix for ifa.ip and ifa.opposite.
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* ifa.opposite is defined and ifa.prefix/pxlen == ifa.opposite/32 (for simplicity).
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* - Host addresses, with ifa.prefix/pxlen == ifa.ip/32 (or /128).
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* May be considered a special case of standard addresses.
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*
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* Peer addresses (AFAIK) do not exist in IPv6. Linux also supports generalized peer
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* addresses (with pxlen < 32 and ifa.ip outside prefix), we do not support that.
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*/
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#define IF_JUST_CREATED 0x10000000 /* Send creation event as soon as possible */
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#define IF_TMP_DOWN 0x20000000 /* Temporary shutdown due to interface reconfiguration */
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#define IF_UPDATED 0x40000000 /* Touched in last scan */
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/* Interface change events */
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#define IF_CHANGE_UP 1
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#define IF_CHANGE_DOWN 2
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#define IF_CHANGE_MTU 4
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#define IF_CHANGE_CREATE 8 /* Seen this interface for the first time */
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#define IF_CHANGE_LINK 0x10
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#define IF_CHANGE_TOO_MUCH 0x40000000 /* Used internally */
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void if_init(void);
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void if_dump(struct iface *);
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void if_dump_all(void);
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void ifa_dump(struct ifa *);
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void if_show(void);
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void if_show_summary(void);
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struct iface *if_update(struct iface *);
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void if_delete(struct iface *old);
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struct ifa *ifa_update(struct ifa *);
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void ifa_delete(struct ifa *);
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void if_start_update(void);
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void if_end_partial_update(struct iface *);
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void if_end_update(void);
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void if_flush_ifaces(struct proto *p);
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void if_feed_baby(struct proto *);
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struct iface *if_find_by_index(unsigned);
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struct iface *if_find_by_name(char *);
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struct iface *if_get_by_name(char *);
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void ifa_recalc_all_primary_addresses(void);
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/* The Neighbor Cache */
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typedef struct neighbor {
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node n; /* Node in global neighbor list */
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node if_n; /* Node in per-interface neighbor list */
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ip_addr addr; /* Address of the neighbor */
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struct ifa *ifa; /* Ifa on related iface */
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struct iface *iface; /* Interface it's connected to */
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struct proto *proto; /* Protocol this belongs to */
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void *data; /* Protocol-specific data */
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unsigned aux; /* Protocol-specific data */
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unsigned flags;
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int scope; /* Address scope, -1 for unreachable sticky neighbors,
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SCOPE_HOST when it's our own address */
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} neighbor;
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#define NEF_STICKY 1
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#define NEF_ONLINK 2
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#define NEF_BIND 4 /* Used internally for neighbors bound to an iface */
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neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
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neighbor *neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags);
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static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
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{
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neighbor *n = neigh_find(p, a, 0);
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return n && n->iface == i;
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}
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void neigh_dump(neighbor *);
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void neigh_dump_all(void);
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void neigh_prune(void);
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void neigh_if_up(struct iface *);
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void neigh_if_down(struct iface *);
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void neigh_if_link(struct iface *);
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void neigh_ifa_update(struct ifa *);
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void neigh_init(struct pool *);
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/*
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* Interface Pattern Lists
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*/
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struct iface_patt_node {
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node n;
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int positive;
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byte *pattern;
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ip_addr prefix;
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int pxlen;
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};
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struct iface_patt {
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node n;
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list ipn_list; /* A list of struct iface_patt_node */
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/* Protocol-specific data follow after this structure */
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};
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int iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a);
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struct iface_patt *iface_patt_find(list *l, struct iface *i, struct ifa *a);
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int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
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u32 if_choose_router_id(struct iface_patt *mask, u32 old_id);
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#endif
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