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mirror_frr/lib/if.h
Andrew J. Schorr e4529636b7 [PtP over ethernet] New peer flag allows much more addressing flexibility 
2006-12-12 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

	* if.h: (struct connected) Add new ZEBRA_IFA_PEER flag indicating
	  whether a peer address has been configured.  Comment now shows
	  the new interpretation of the destination addr: if ZEBRA_IFA_PEER
	  is set, then it must contain the destination address, otherwise
	  it may contain the broadcast address or be NULL.
	  (CONNECTED_DEST_HOST,CONNECTED_POINTOPOINT_HOST) Remove obsolete
	  macros that were specific to IPv4 and not fully general.
	  (CONNECTED_PEER) New macro to check ZEBRA_IFA_PEER flag.
	  (CONNECTED_PREFIX) New macro giving the prefix to insert into
	  the RIB: if CONNECTED_PEER, then use the destination (peer) address,
	  else use the address field.
	  (CONNECTED_ID) New macro to come up with an identifying address
	  for the struct connected.
	* if.c: (if_lookup_address, connected_lookup_address) Streamline
	  logic with new CONNECTED_PREFIX macro.
	* prefix.h: (PREFIX_COPY_IPV4, PREFIX_COPY_IPV6) New macros
	  for better performance than the general prefix_copy function.
	* zclient.c: (zebra_interface_address_read) For non-null destination
	  addresses, set prefixlen to equal the address prefixlen.  This
	  is needed to get the new CONNECTED_PREFIX macro to work properly.
	* connected.c: (connected_up_ipv4, connected_down_ipv4,
	  connected_up_ipv6, connected_down_ipv6) Simplify logic using the
	  new CONNECTED_PREFIX macro.
	  (connected_add_ipv4) Set prefixlen in destination addresses (required
	  by the CONNECTED_PREFIX macro).  Use CONNECTED_PEER macro instead
	  of testing for IFF_POINTOPOINT.  Delete invalid warning message.
	  Warn about cases where the ZEBRA_IFA_PEER is set but no
	  destination address has been supplied (and turn off the flag).
	  (connected_add_ipv6) Add new flags argument so callers may set
	  the ZEBRA_IFA_PEER flag.  If peer/broadcast address satisfies
	  IN6_IS_ADDR_UNSPECIFIED, then reject it with a warning.
	  Set prefixlen in destination address so CONNECTED_PREFIX will work.
	* connected.h: (connected_add_ipv6) Add new flags argument so
	  callers may set the ZEBRA_IFA_PEER flag.
	* interface.c: (connected_dump_vty) Use CONNECTED_PEER macro
	  to decide whether the destination address is a peer or broadcast
	  address (instead of checking IFF_BROADCAST and IFF_POINTOPOINT).
	* if_ioctl.c: (if_getaddrs) Instead of setting a peer address
	  only when the IFF_POINTOPOINT is set, we now accept a peer
	  address whenever it is available and not the same as the local
	  address.  Otherwise (no peer address assigned), we check
	  for a broadcast address (regardless of the IFF_BROADCAST flag).
	  And must now pass a flags value of ZEBRA_IFA_PEER to
	  connected_add_ipv4 when a peer address is assigned.
	  The same new logic is used with the IPv6 code as well (and we
	  pass the new flags argument to connected_add_ipv6).
	  (if_get_addr) Do not bother to check IFF_POINTOPOINT: just
	  issue the SIOCGIFDSTADDR ioctl and see if we get back
	  a peer address not matching the local address (and set
	  the ZEBRA_IFA_PEER in that case).  If there's no peer address,
	  try to grab SIOCGIFBRDADDR regardless of whether IFF_BROADCAST is set.
	* if_ioctl_solaris.c: (if_get_addr) Just try the SIOCGLIFDSTADDR ioctl
	  without bothering to check the IFF_POINTOPOINT flag.  And if
	  no peer address was found, just try the SIOCGLIFBRDADDR ioctl
	  without checking the IFF_BROADCAST flag.  Call connected_add_ipv4
	  and connected_add_ipv6 with appropriate flags.
	* if_proc.c: (ifaddr_proc_ipv6) Must pass new flags argument to
	  connected_add_ipv6.
	* kernel_socket.c: (ifam_read) Must pass new flags argument to
	  connected_add_ipv6.
	* rt_netlink.c: (netlink_interface_addr) Copy logic from iproute2
	  to determine local and possible peer address (so there's no longer
	  a test for IFF_POINTOPOINT).  Set ZEBRA_IFA_PEER flag appropriately.
	  Pass new flags argument to connected_add_ipv6.
	  (netlink_address) Test !CONNECTED_PEER instead of if_is_broadcast
	  to determine whether the connected destination address is a
	  broadcast address.
	* bgp_nexthop.c: (bgp_connected_add, bgp_connected_delete)
	  Simplify logic by using new CONNECTED_PREFIX macro.
	* ospf_interface.c: (ospf_if_is_configured, ospf_if_lookup_by_prefix,
	  ospf_if_lookup_recv_if) Simplify logic using new CONNECTED_PREFIX
	  macro.
	* ospf_lsa.c: (lsa_link_ptop_set) Using the new CONNECTED_PREFIX
	  macro, both options collapse into the same code.
	* ospf_snmp.c: (ospf_snmp_if_update) Simplify logic using new
	  CONNECTED_ID macro.
	  (ospf_snmp_is_if_have_addr) Simplify logic using new CONNECTED_PREFIX
	  macro.
	* ospf_vty.c: (show_ip_ospf_interface_sub) Use new CONNECTED_PEER macro
	  instead of testing the IFF_POINTOPOINT flag.
	* ospfd.c: (ospf_network_match_iface) Use new CONNECTED_PEER macro
	  instead of testing with if_is_pointopoint.  And add commented-out
	  code to implement alternative (in my opinion) more elegant behavior
	  that has no special-case treatment for PtP addresses.
	  (ospf_network_run) Use new CONNECTED_ID macro to simplify logic.
	* rip_interface.c: (rip_interface_multicast_set) Use new CONNECTED_ID
	  macro to simplify logic.
	  (rip_request_interface_send) Fix minor bug: ipv4_broadcast_addr does
	  not give a useful result if prefixlen is 32 (we require a peer
	  address in such cases).
	* ripd.c: (rip_update_interface) Fix same bug as above.
2006-12-12 19:18:21 +00:00

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/* Interface related header.
Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
This file is part of GNU Zebra.
GNU Zebra is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
GNU Zebra is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Zebra; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _ZEBRA_IF_H
#define _ZEBRA_IF_H
#include "linklist.h"
/*
Interface name length.
Linux define value in /usr/include/linux/if.h.
#define IFNAMSIZ 16
FreeBSD define value in /usr/include/net/if.h.
#define IFNAMSIZ 16
*/
#define INTERFACE_NAMSIZ 20
#define INTERFACE_HWADDR_MAX 20
#ifdef HAVE_PROC_NET_DEV
struct if_stats
{
unsigned long rx_packets; /* total packets received */
unsigned long tx_packets; /* total packets transmitted */
unsigned long rx_bytes; /* total bytes received */
unsigned long tx_bytes; /* total bytes transmitted */
unsigned long rx_errors; /* bad packets received */
unsigned long tx_errors; /* packet transmit problems */
unsigned long rx_dropped; /* no space in linux buffers */
unsigned long tx_dropped; /* no space available in linux */
unsigned long rx_multicast; /* multicast packets received */
unsigned long rx_compressed;
unsigned long tx_compressed;
unsigned long collisions;
/* detailed rx_errors: */
unsigned long rx_length_errors;
unsigned long rx_over_errors; /* receiver ring buff overflow */
unsigned long rx_crc_errors; /* recved pkt with crc error */
unsigned long rx_frame_errors; /* recv'd frame alignment error */
unsigned long rx_fifo_errors; /* recv'r fifo overrun */
unsigned long rx_missed_errors; /* receiver missed packet */
/* detailed tx_errors */
unsigned long tx_aborted_errors;
unsigned long tx_carrier_errors;
unsigned long tx_fifo_errors;
unsigned long tx_heartbeat_errors;
unsigned long tx_window_errors;
};
#endif /* HAVE_PROC_NET_DEV */
/* Interface structure */
struct interface
{
/* Interface name. This should probably never be changed after the
interface is created, because the configuration info for this interface
is associated with this structure. For that reason, the interface
should also never be deleted (to avoid losing configuration info).
To delete, just set ifindex to IFINDEX_INTERNAL to indicate that the
interface does not exist in the kernel.
*/
char name[INTERFACE_NAMSIZ + 1];
/* Interface index (should be IFINDEX_INTERNAL for non-kernel or
deleted interfaces). */
unsigned int ifindex;
#define IFINDEX_INTERNAL 0
/* Zebra internal interface status */
u_char status;
#define ZEBRA_INTERFACE_ACTIVE (1 << 0)
#define ZEBRA_INTERFACE_SUB (1 << 1)
#define ZEBRA_INTERFACE_LINKDETECTION (1 << 2)
/* Interface flags. */
uint64_t flags;
/* Interface metric */
int metric;
/* Interface MTU. */
unsigned int mtu; /* IPv4 MTU */
unsigned int mtu6; /* IPv6 MTU - probably, but not neccessarily same as mtu */
/* Hardware address. */
#ifdef HAVE_SOCKADDR_DL
struct sockaddr_dl sdl;
#else
unsigned short hw_type;
u_char hw_addr[INTERFACE_HWADDR_MAX];
int hw_addr_len;
#endif /* HAVE_SOCKADDR_DL */
/* interface bandwidth, kbits */
unsigned int bandwidth;
/* description of the interface. */
char *desc;
/* Distribute list. */
void *distribute_in;
void *distribute_out;
/* Connected address list. */
struct list *connected;
/* Daemon specific interface data pointer. */
void *info;
/* Statistics fileds. */
#ifdef HAVE_PROC_NET_DEV
struct if_stats stats;
#endif /* HAVE_PROC_NET_DEV */
#ifdef HAVE_NET_RT_IFLIST
struct if_data stats;
#endif /* HAVE_NET_RT_IFLIST */
};
/* Connected address structure. */
struct connected
{
/* Attached interface. */
struct interface *ifp;
/* Flags for configuration. */
u_char conf;
#define ZEBRA_IFC_REAL (1 << 0)
#define ZEBRA_IFC_CONFIGURED (1 << 1)
/*
The ZEBRA_IFC_REAL flag should be set if and only if this address
exists in the kernel.
The ZEBRA_IFC_CONFIGURED flag should be set if and only if this address
was configured by the user from inside quagga.
*/
/* Flags for connected address. */
u_char flags;
#define ZEBRA_IFA_SECONDARY (1 << 0)
#define ZEBRA_IFA_PEER (1 << 1)
/* N.B. the ZEBRA_IFA_PEER flag should be set if and only if
a peer address has been configured. If this flag is set,
the destination field must contain the peer address.
Otherwise, if this flag is not set, the destination address
will either contain a broadcast address or be NULL.
*/
/* Address of connected network. */
struct prefix *address;
/* Peer or Broadcast address, depending on whether ZEBRA_IFA_PEER is set.
Note: destination may be NULL if ZEBRA_IFA_PEER is not set. */
struct prefix *destination;
/* Label for Linux 2.2.X and upper. */
char *label;
};
/* Does the destination field contain a peer address? */
#define CONNECTED_PEER(C) CHECK_FLAG((C)->flags, ZEBRA_IFA_PEER)
/* Prefix to insert into the RIB */
#define CONNECTED_PREFIX(C) \
(CONNECTED_PEER(C) ? (C)->destination : (C)->address)
/* Identifying address. We guess that if there's a peer address, but the
local address is in the same prefix, then the local address may be unique. */
#define CONNECTED_ID(C) \
((CONNECTED_PEER(C) && !prefix_match((C)->destination, (C)->address)) ?\
(C)->destination : (C)->address)
/* Interface hook sort. */
#define IF_NEW_HOOK 0
#define IF_DELETE_HOOK 1
/* There are some interface flags which are only supported by some
operating system. */
#ifndef IFF_NOTRAILERS
#define IFF_NOTRAILERS 0x0
#endif /* IFF_NOTRAILERS */
#ifndef IFF_OACTIVE
#define IFF_OACTIVE 0x0
#endif /* IFF_OACTIVE */
#ifndef IFF_SIMPLEX
#define IFF_SIMPLEX 0x0
#endif /* IFF_SIMPLEX */
#ifndef IFF_LINK0
#define IFF_LINK0 0x0
#endif /* IFF_LINK0 */
#ifndef IFF_LINK1
#define IFF_LINK1 0x0
#endif /* IFF_LINK1 */
#ifndef IFF_LINK2
#define IFF_LINK2 0x0
#endif /* IFF_LINK2 */
#ifndef IFF_NOXMIT
#define IFF_NOXMIT 0x0
#endif /* IFF_NOXMIT */
#ifndef IFF_NORTEXCH
#define IFF_NORTEXCH 0x0
#endif /* IFF_NORTEXCH */
#ifndef IFF_IPV4
#define IFF_IPV4 0x0
#endif /* IFF_IPV4 */
#ifndef IFF_IPV6
#define IFF_IPV6 0x0
#endif /* IFF_IPV6 */
#ifndef IFF_VIRTUAL
#define IFF_VIRTUAL 0x0
#endif /* IFF_VIRTUAL */
/* Prototypes. */
extern int if_cmp_func (struct interface *, struct interface *);
extern struct interface *if_create (const char *name, int namelen);
extern struct interface *if_lookup_by_index (unsigned int);
extern struct interface *if_lookup_exact_address (struct in_addr);
extern struct interface *if_lookup_address (struct in_addr);
/* These 2 functions are to be used when the ifname argument is terminated
by a '\0' character: */
extern struct interface *if_lookup_by_name (const char *ifname);
extern struct interface *if_get_by_name (const char *ifname);
/* For these 2 functions, the namelen argument should be the precise length
of the ifname string (not counting any optional trailing '\0' character).
In most cases, strnlen should be used to calculate the namelen value. */
extern struct interface *if_lookup_by_name_len(const char *ifname,
size_t namelen);
extern struct interface *if_get_by_name_len(const char *ifname, size_t namelen);
/* Delete the interface, but do not free the structure, and leave it in the
interface list. It is often advisable to leave the pseudo interface
structure because there may be configuration information attached. */
extern void if_delete_retain (struct interface *);
/* Delete and free the interface structure: calls if_delete_retain and then
deletes it from the interface list and frees the structure. */
extern void if_delete (struct interface *);
extern int if_is_up (struct interface *);
extern int if_is_running (struct interface *);
extern int if_is_operative (struct interface *);
extern int if_is_loopback (struct interface *);
extern int if_is_broadcast (struct interface *);
extern int if_is_pointopoint (struct interface *);
extern int if_is_multicast (struct interface *);
extern void if_add_hook (int, int (*)(struct interface *));
extern void if_init (void);
extern void if_dump_all (void);
extern const char *if_flag_dump(unsigned long);
/* Please use ifindex2ifname instead of if_indextoname where possible;
ifindex2ifname uses internal interface info, whereas if_indextoname must
make a system call. */
extern const char *ifindex2ifname (unsigned int);
/* Please use ifname2ifindex instead of if_nametoindex where possible;
ifname2ifindex uses internal interface info, whereas if_nametoindex must
make a system call. */
extern unsigned int ifname2ifindex(const char *ifname);
/* Connected address functions. */
extern struct connected *connected_new (void);
extern void connected_free (struct connected *);
extern void connected_add (struct interface *, struct connected *);
extern struct connected *connected_add_by_prefix (struct interface *,
struct prefix *,
struct prefix *);
extern struct connected *connected_delete_by_prefix (struct interface *,
struct prefix *);
extern struct connected *connected_lookup_address (struct interface *,
struct in_addr);
#ifndef HAVE_IF_NAMETOINDEX
extern unsigned int if_nametoindex (const char *);
#endif
#ifndef HAVE_IF_INDEXTONAME
extern char *if_indextoname (unsigned int, char *);
#endif
/* Exported variables. */
extern struct list *iflist;
extern struct cmd_element interface_desc_cmd;
extern struct cmd_element no_interface_desc_cmd;
extern struct cmd_element interface_cmd;
extern struct cmd_element no_interface_cmd;
extern struct cmd_element interface_pseudo_cmd;
extern struct cmd_element no_interface_pseudo_cmd;
extern struct cmd_element show_address_cmd;
#endif /* _ZEBRA_IF_H */
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