if.c
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上传日期:2009-11-15
资源大小:1338k
文件大小:14k
- /*
- * Interface functions.
- * Copyright (C) 1997, 98 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.
- */
- #include <zebra.h>
- #include "linklist.h"
- #include "vector.h"
- #include "vty.h"
- #include "command.h"
- #include "if.h"
- #include "sockunion.h"
- #include "prefix.h"
- #include "zebra/connected.h"
- #include "memory.h"
- #include "table.h"
- #include "buffer.h"
- #include "str.h"
- #include "log.h"
- /* Master list of interfaces. */
- struct list *iflist;
- /* One for each program. This structure is needed to store hooks. */
- struct if_master
- {
- int (*if_new_hook) (struct interface *);
- int (*if_delete_hook) (struct interface *);
- } if_master;
- /* Create new interface structure. */
- struct interface *
- if_new ()
- {
- struct interface *ifp;
- ifp = XMALLOC (MTYPE_IF, sizeof (struct interface));
- memset (ifp, 0, sizeof (struct interface));
- return ifp;
- }
- struct interface *
- if_create ()
- {
- struct interface *ifp;
- ifp = if_new ();
-
- listnode_add (iflist, ifp);
- ifp->connected = list_new ();
- ifp->connected->del = (void (*) (void *)) connected_free;
- if (if_master.if_new_hook)
- (*if_master.if_new_hook) (ifp);
- return ifp;
- }
- /* Delete and free interface structure. */
- void
- if_delete (struct interface *ifp)
- {
- listnode_delete (iflist, ifp);
- if (if_master.if_delete_hook)
- (*if_master.if_delete_hook) (ifp);
- /* Free connected address list */
- list_delete (ifp->connected);
- XFREE (MTYPE_IF, ifp);
- }
- /* Add hook to interface master. */
- void
- if_add_hook (int type, int (*func)(struct interface *ifp))
- {
- switch (type) {
- case IF_NEW_HOOK:
- if_master.if_new_hook = func;
- break;
- case IF_DELETE_HOOK:
- if_master.if_delete_hook = func;
- break;
- default:
- break;
- }
- }
- /* Interface existance check by index. */
- struct interface *
- if_lookup_by_index (unsigned int index)
- {
- listnode node;
- struct interface *ifp;
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- if (ifp->ifindex == index)
- return ifp;
- }
- return NULL;
- }
- char *
- ifindex2ifname (unsigned int index)
- {
- listnode node;
- struct interface *ifp;
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- if (ifp->ifindex == index)
- return ifp->name;
- }
- return "unknown";
- }
- /* Interface existance check by interface name. */
- struct interface *
- if_lookup_by_name (char *name)
- {
- listnode node;
- struct interface *ifp;
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- if (strncmp (name, ifp->name, sizeof ifp->name) == 0)
- return ifp;
- }
- return NULL;
- }
- /* Lookup interface by IPv4 address. */
- struct interface *
- if_lookup_exact_address (struct in_addr src)
- {
- listnode node;
- listnode cnode;
- struct interface *ifp;
- struct prefix *p;
- struct connected *c;
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
- {
- c = getdata (cnode);
- p = c->address;
- if (p && p->family == AF_INET)
- {
- if (IPV4_ADDR_SAME (&p->u.prefix4, &src))
- return ifp;
- }
- }
- }
- return NULL;
- }
- /* Lookup interface by IPv4 address. */
- struct interface *
- if_lookup_address (struct in_addr src)
- {
- listnode node;
- struct prefix addr;
- struct prefix best;
- listnode cnode;
- struct interface *ifp;
- struct prefix *p;
- struct connected *c;
- struct interface *match;
- /* Zero structures - get rid of rubbish from stack */
- memset(&addr, 0, sizeof(addr));
- memset(&best, 0, sizeof(best));
- addr.family = AF_INET;
- addr.u.prefix4 = src;
- addr.prefixlen = IPV4_MAX_BITLEN;
- match = NULL;
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
- {
- c = getdata (cnode);
- if (if_is_pointopoint (ifp))
- {
- p = c->address;
- if (p && p->family == AF_INET)
- {
- #ifdef OLD_RIB /* PTP links are conventionally identified
- by the address of the far end - MAG */
- if (IPV4_ADDR_SAME (&p->u.prefix4, &src))
- return ifp;
- #endif
- p = c->destination;
- if (p && IPV4_ADDR_SAME (&p->u.prefix4, &src))
- return ifp;
- }
- }
- else
- {
- p = c->address;
- if (p->family == AF_INET)
- {
- if (prefix_match (p, &addr) && p->prefixlen > best.prefixlen)
- {
- best = *p;
- match = ifp;
- }
- }
- }
- }
- }
- return match;
- }
- /* Get interface by name if given name interface doesn't exist create
- one. */
- struct interface *
- if_get_by_name (char *name)
- {
- struct interface *ifp;
- ifp = if_lookup_by_name (name);
- if (ifp == NULL)
- {
- ifp = if_create ();
- strncpy (ifp->name, name, IFNAMSIZ);
- }
- return ifp;
- }
- /* Does interface up ? */
- int
- if_is_up (struct interface *ifp)
- {
- return ifp->flags & IFF_UP;
- }
- /* Is this loopback interface ? */
- int
- if_is_loopback (struct interface *ifp)
- {
- return ifp->flags & IFF_LOOPBACK;
- }
- /* Does this interface support broadcast ? */
- int
- if_is_broadcast (struct interface *ifp)
- {
- return ifp->flags & IFF_BROADCAST;
- }
- /* Does this interface support broadcast ? */
- int
- if_is_pointopoint (struct interface *ifp)
- {
- return ifp->flags & IFF_POINTOPOINT;
- }
- /* Does this interface support multicast ? */
- int
- if_is_multicast (struct interface *ifp)
- {
- return ifp->flags & IFF_MULTICAST;
- }
- /* Printout flag information into log */
- const char *
- if_flag_dump (unsigned long flag)
- {
- int separator = 0;
- static char logbuf[BUFSIZ];
- #define IFF_OUT_LOG(X,STR)
- if ((X) && (flag & (X)))
- {
- if (separator)
- strlcat (logbuf, ",", BUFSIZ);
- else
- separator = 1;
- strlcat (logbuf, STR, BUFSIZ);
- }
- strlcpy (logbuf, " <", BUFSIZ);
- IFF_OUT_LOG (IFF_UP, "UP");
- IFF_OUT_LOG (IFF_BROADCAST, "BROADCAST");
- IFF_OUT_LOG (IFF_DEBUG, "DEBUG");
- IFF_OUT_LOG (IFF_LOOPBACK, "LOOPBACK");
- IFF_OUT_LOG (IFF_POINTOPOINT, "POINTOPOINT");
- IFF_OUT_LOG (IFF_NOTRAILERS, "NOTRAILERS");
- IFF_OUT_LOG (IFF_RUNNING, "RUNNING");
- IFF_OUT_LOG (IFF_NOARP, "NOARP");
- IFF_OUT_LOG (IFF_PROMISC, "PROMISC");
- IFF_OUT_LOG (IFF_ALLMULTI, "ALLMULTI");
- IFF_OUT_LOG (IFF_OACTIVE, "OACTIVE");
- IFF_OUT_LOG (IFF_SIMPLEX, "SIMPLEX");
- IFF_OUT_LOG (IFF_LINK0, "LINK0");
- IFF_OUT_LOG (IFF_LINK1, "LINK1");
- IFF_OUT_LOG (IFF_LINK2, "LINK2");
- IFF_OUT_LOG (IFF_MULTICAST, "MULTICAST");
- strlcat (logbuf, ">", BUFSIZ);
- return logbuf;
- }
- /* For debugging */
- void
- if_dump (struct interface *ifp)
- {
- listnode node;
- zlog_info ("Interface %s index %d metric %d mtu %d %s",
- ifp->name, ifp->ifindex, ifp->metric, ifp->mtu,
- if_flag_dump (ifp->flags));
-
- for (node = listhead (ifp->connected); node; nextnode (node))
- ;
- }
- /* Interface printing for all interface. */
- void
- if_dump_all ()
- {
- listnode node;
- for (node = listhead (iflist); node; nextnode (node))
- if_dump (getdata (node));
- }
- DEFUN (interface_desc,
- interface_desc_cmd,
- "description .LINE",
- "Interface specific descriptionn"
- "Characters describing this interfacen")
- {
- int i;
- struct interface *ifp;
- struct buffer *b;
- if (argc == 0)
- return CMD_SUCCESS;
- ifp = vty->index;
- if (ifp->desc)
- XFREE (0, ifp->desc);
- b = buffer_new (1024);
- for (i = 0; i < argc; i++)
- {
- buffer_putstr (b, (u_char *)argv[i]);
- buffer_putc (b, ' ');
- }
- buffer_putc (b, ' ');
- ifp->desc = buffer_getstr (b);
- buffer_free (b);
- return CMD_SUCCESS;
- }
- DEFUN (no_interface_desc,
- no_interface_desc_cmd,
- "no description",
- NO_STR
- "Interface specific descriptionn")
- {
- struct interface *ifp;
- ifp = vty->index;
- if (ifp->desc)
- XFREE (0, ifp->desc);
- ifp->desc = NULL;
- return CMD_SUCCESS;
- }
- /* See also wrapper function zebra_interface() in zebra/interface.c */
- DEFUN (interface,
- interface_cmd,
- "interface IFNAME",
- "Select an interface to configuren"
- "Interface's namen")
- {
- struct interface *ifp;
- ifp = if_lookup_by_name (argv[0]);
- if (ifp == NULL)
- {
- ifp = if_create ();
- strncpy (ifp->name, argv[0], INTERFACE_NAMSIZ);
- }
- vty->index = ifp;
- vty->node = INTERFACE_NODE;
- return CMD_SUCCESS;
- }
- /* For debug purpose. */
- DEFUN (show_address,
- show_address_cmd,
- "show address",
- SHOW_STR
- "addressn")
- {
- listnode node;
- listnode node2;
- struct interface *ifp;
- struct connected *ifc;
- struct prefix *p;
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- for (node2 = listhead (ifp->connected); node2; nextnode (node2))
- {
- ifc = getdata (node2);
- p = ifc->address;
- if (p->family == AF_INET)
- vty_out (vty, "%s/%d%s", inet_ntoa (p->u.prefix4), p->prefixlen,
- VTY_NEWLINE);
- }
- }
- return CMD_SUCCESS;
- }
- /* Allocate connected structure. */
- struct connected *
- connected_new ()
- {
- struct connected *new = XMALLOC (MTYPE_CONNECTED, sizeof (struct connected));
- memset (new, 0, sizeof (struct connected));
- return new;
- }
- /* Free connected structure. */
- void
- connected_free (struct connected *connected)
- {
- if (connected->address)
- prefix_free (connected->address);
- if (connected->destination)
- prefix_free (connected->destination);
- if (connected->label)
- free (connected->label);
- XFREE (MTYPE_CONNECTED, connected);
- }
- /* Print if_addr structure. */
- void
- connected_log (struct connected *connected, char *str)
- {
- struct prefix *p;
- struct interface *ifp;
- char logbuf[BUFSIZ];
- char buf[BUFSIZ];
-
- ifp = connected->ifp;
- p = connected->address;
- snprintf (logbuf, BUFSIZ, "%s interface %s %s %s/%d ",
- str, ifp->name, prefix_family_str (p),
- inet_ntop (p->family, &p->u.prefix, buf, BUFSIZ),
- p->prefixlen);
- p = connected->destination;
- if (p)
- {
- strncat (logbuf, inet_ntop (p->family, &p->u.prefix, buf, BUFSIZ),
- BUFSIZ - strlen(logbuf));
- }
- zlog (NULL, LOG_INFO, logbuf);
- }
- /* If two connected address has same prefix return 1. */
- int
- connected_same_prefix (struct prefix *p1, struct prefix *p2)
- {
- if (p1->family == p2->family)
- {
- if (p1->family == AF_INET &&
- IPV4_ADDR_SAME (&p1->u.prefix4, &p2->u.prefix4))
- return 1;
- #ifdef HAVE_IPV6
- if (p1->family == AF_INET6 &&
- IPV6_ADDR_SAME (&p1->u.prefix6, &p2->u.prefix6))
- return 1;
- #endif /* HAVE_IPV6 */
- }
- return 0;
- }
- struct connected *
- connected_delete_by_prefix (struct interface *ifp, struct prefix *p)
- {
- struct listnode *node;
- struct listnode *next;
- struct connected *ifc;
- /* In case of same prefix come, replace it with new one. */
- for (node = listhead (ifp->connected); node; node = next)
- {
- ifc = getdata (node);
- next = node->next;
- if (connected_same_prefix (ifc->address, p))
- {
- listnode_delete (ifp->connected, ifc);
- return ifc;
- }
- }
- return NULL;
- }
- /* Check the connected information is PtP style or not. */
- int
- ifc_pointopoint (struct connected *ifc)
- {
- struct prefix *p;
- int ptp = 0;
- /* When interface has PtP flag. */
- if (if_is_pointopoint (ifc->ifp))
- return 1;
- /* RFC3021 PtP check. */
- p = ifc->address;
- if (p->family == AF_INET)
- ptp = (p->prefixlen >= IPV4_MAX_PREFIXLEN - 1);
- #ifdef HAVE_IPV6
- if (p->family == AF_INET6)
- ptp = (p->prefixlen >= IPV6_MAX_PREFIXLEN - 1);
- #endif /* HAVE_IPV6 */
- return ptp;
- }
- #ifndef HAVE_IF_NAMETOINDEX
- unsigned int
- if_nametoindex (const char *name)
- {
- listnode node;
- struct interface *ifp;
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- if (strcmp (ifp->name, name) == 0)
- return ifp->ifindex;
- }
- return 0;
- }
- #endif
- #ifndef HAVE_IF_INDEXTONAME
- char *
- if_indextoname (unsigned int ifindex, char *name)
- {
- listnode node;
- struct interface *ifp;
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- if (ifp->ifindex == ifindex)
- {
- memcpy (name, ifp->name, IFNAMSIZ);
- return ifp->name;
- }
- }
- return NULL;
- }
- #endif
- /* Interface looking up by interface's address. */
- /* Interface's IPv4 address reverse lookup table. */
- struct route_table *ifaddr_ipv4_table;
- /* struct route_table *ifaddr_ipv6_table; */
- void
- ifaddr_ipv4_add (struct in_addr *ifaddr, struct interface *ifp)
- {
- struct route_node *rn;
- struct prefix_ipv4 p;
- p.family = AF_INET;
- p.prefixlen = IPV4_MAX_PREFIXLEN;
- p.prefix = *ifaddr;
- rn = route_node_get (ifaddr_ipv4_table, (struct prefix *) &p);
- if (rn)
- {
- route_unlock_node (rn);
- zlog_info ("ifaddr_ipv4_add(): address %s is already added",
- inet_ntoa (*ifaddr));
- return;
- }
- rn->info = ifp;
- }
- void
- ifaddr_ipv4_delete (struct in_addr *ifaddr, struct interface *ifp)
- {
- struct route_node *rn;
- struct prefix_ipv4 p;
- p.family = AF_INET;
- p.prefixlen = IPV4_MAX_PREFIXLEN;
- p.prefix = *ifaddr;
- rn = route_node_lookup (ifaddr_ipv4_table, (struct prefix *) &p);
- if (! rn)
- {
- zlog_info ("ifaddr_ipv4_delete(): can't find address %s",
- inet_ntoa (*ifaddr));
- return;
- }
- rn->info = NULL;
- route_unlock_node (rn);
- route_unlock_node (rn);
- }
- /* Lookup interface by interface's IP address or interface index. */
- struct interface *
- ifaddr_ipv4_lookup (struct in_addr *addr, unsigned int ifindex)
- {
- struct prefix_ipv4 p;
- struct route_node *rn;
- struct interface *ifp;
- listnode node;
- if (addr)
- {
- p.family = AF_INET;
- p.prefixlen = IPV4_MAX_PREFIXLEN;
- p.prefix = *addr;
- rn = route_node_lookup (ifaddr_ipv4_table, (struct prefix *) &p);
- if (! rn)
- return NULL;
-
- ifp = rn->info;
- route_unlock_node (rn);
- return ifp;
- }
- else
- {
- for (node = listhead (iflist); node; nextnode (node))
- {
- ifp = getdata (node);
- if (ifp->ifindex == ifindex)
- return ifp;
- }
- }
- return NULL;
- }
- /* Initialize interface list. */
- void
- if_init ()
- {
- iflist = list_new ();
- ifaddr_ipv4_table = route_table_init ();
- if (iflist)
- return;
- memset (&if_master, 0, sizeof if_master);
- }