mn_agentadv.c

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/* $Id: mn_agentadv.c,v 1.76 2001/09/29 18:42:07 jm Exp $
 * Mobile Node agentadv module
 *
 * Dynamic hierarchial IP tunnel
 * Copyright (C) 1998-2001, Dynamics group
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See README and COPYING for
 * more details.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <features.h>    /* for the glibc version number */
#include <unistd.h>
#ifdef DYN_TARGET_LINUX
#include <net/if_arp.h>
#ifndef __GLIBC__
/* get struct iphdr */
#include <linux/ip.h>
#endif
#endif

#include "hashtable.h"
#include "debug.h"
#include "fileio.h"
#include "proxyarp.h"
#ifdef WITH_WIRELESS
#include "monitor.h"
#endif
#include "dyn_ip.h"
#include "agentapi.h"
#include "util.h"
#include "mn_agentadv.h"
#include "mn_handler.h"
#include "mn.h"


/* fa decision .. */
static struct agentadv_data *max_adv;
static int max_priority;
static struct timeval max_adv_time;

extern struct mn_data mn; 
extern struct mn_config config;
extern struct timeval timers[TIMER_COUNT];
extern int real_tunnel_up; /* from mn_tunnel */


int adv_ok_fa(struct agentadv_data *adv)
{
        int opts;

        if (mn.force_fa_addr.s_addr != 0 &&
            mn.force_fa_addr.s_addr != adv->addr.s_addr)
                return 0;

        if (adv->adv.ext == NULL)
                return 0;

        opts = ntohs(adv->adv.ext->opts);
        if ((opts & AGENT_ADV_BUSY) || !(opts & AGENT_ADV_FOREIGN_AGENT))
                return 0;

        if (config.tunneling_mode == TUNMODE_REVERSE &&
            !(opts & AGENT_ADV_BIDIR_TUNNELING))
                return 0;

        if (config.tunneling_mode == TUNMODE_TRIANGLE &&
            adv->adv.own_ext != NULL &&
            !(adv->adv.own_ext->opts & AGENT_ADV_OWN_TRIANGLE_TUNNELING))
                return 0;

        return 1;
}


static int addr_cmp(void *key, struct node *cmprd)
{
        struct agentadv_data *entry = (struct agentadv_data *) cmprd;
        struct agentadv_key *akey = (struct agentadv_key *) key;

        if (akey->addr.s_addr == entry->addr.s_addr &&
            (akey->ifindex == 0 || akey->ifindex == entry->ifindex))
                return TRUE;
        return FALSE;
}


static int addr_hash(void *key, const int tablesize)
{
        unsigned char *addr;
        struct agentadv_key *akey = (struct agentadv_key *) key;

        addr = (unsigned char *) &akey->addr;
        return (int) (addr[0] ^ addr[1] ^ addr[2] ^ addr[3]);
}


struct agentadv_data *
adv_fetch(struct hashtable *adv_hash, struct in_addr *addr, int ifindex)
{
        struct agentadv_data *adv;
        struct agentadv_key key;
        key.addr.s_addr = addr->s_addr;
        key.ifindex = ifindex;

        adv = (struct agentadv_data *)
                hashtable_fetch(adv_hash, addr_hash, &key, addr_cmp);
        return (adv);
}


static int current_agent_expired;

/* remove hashtable entry, if the current time (data as struct timeval *) is
 * NULL (forced cleaning) or if the entry has expired */
int clean_agentadv(struct node *node, void *data)
{
        struct agentadv_data *adv;
        struct timeval *tval;
        struct event_FA dat;

        adv = (struct agentadv_data *) node;
        tval = (struct timeval *) data;

        if (tval != NULL && cmp_timeval(tval, &adv->expire) < 0)
                return TRUE; /* not expired */

        if (tval != NULL && adv->in_use) {
                /* in use and removal not forced */
                current_agent_expired = TRUE;
                return TRUE;
        }

        DEBUG(DEBUG_AGENTADV, "clean_agentadv: removing %s\n",
              inet_ntoa(adv->addr));

        /* call handlers registered for FA_ADV_EXPIRE event */
        dat.adv = adv;
        dat.hash = mn.agentadv;
        handler_call_all(FA_ADV_EXPIRE, &dat);

        /* remove the possible ARP entries etc. */
        if (adv->arpentry == 1 &&
            arp_del_permanent_item(adv->addr, adv->ifname) < 0) {
                if (device_up(adv->ifindex)) {
                        LOG2(LOG_WARNING,
                             "arp_del_permanent_item(%s, %s) failed\n",
                             inet_ntoa(adv->addr), adv->ifname);
                } else {
                        DEBUG(DEBUG_INFO, "arp_del_permanent_item(%s, %s) "
                              "failed (device down)\n",
                              inet_ntoa(adv->addr), adv->ifname);
                }
        }

        /* remove the possible host route to FA */
        if (adv->routeentry == 1) {
                DEBUG(DEBUG_INFO, "Removing FA route (%s,%s)\n",
                      inet_ntoa(adv->addr), adv->ifname);
                if (dyn_ip_route_del(adv->addr, adv->ifname) != 0)
                        DEBUG(DEBUG_INFO, "FA route removing failed\n");
        }

        if (mn.current_adv == adv) {
                DEBUG(DEBUG_AGENTADV, "clean_agentadv: removed current_adv\n");
                mn.current_adv = NULL;
        }

        hashtable_remove(node);
        free(adv);

        return TRUE;
}


static void handle_home_adv(struct agentadv_data *adv)
{
        struct in_addr addr;

        DEBUG(DEBUG_AGENTADV, "Home advertisement\n");
        if (config.priv_ha_ip_addr.s_addr != 0)
                addr = config.priv_ha_ip_addr;
        else
                addr = config.ha_ip_addr;
        if (addr.s_addr != adv->addr.s_addr) {
                struct node *iter;
                int found = 0;
                for (iter = list_get_first(&config.alt_ha_ip_addrs);
                     iter != NULL; iter = list_get_next(iter)) {
                        struct alt_ha_entry *alt =
                                (struct alt_ha_entry *) iter;
                        if (alt->addr.s_addr == adv->addr.s_addr) {
                                found = 1;
                                break;
                        }
                }
                if (!found) {
                        DEBUG(DEBUG_AGENTADV, "\tnot our HA\n");
                        return;
                }
        }

        if (config.ha_nai_len > 0) {
                struct fa_nai_ext *fa_nai =
                        (struct fa_nai_ext *) adv->adv.fa_nai;
                if (fa_nai == NULL) {
                        DEBUG(DEBUG_AGENTADV, "\tno NAI extension in agent adv"
                              " - ignoring packet\n");
                        return;
                }
                if (config.ha_nai_len != GET_NAI_LEN(fa_nai)) {
                        DEBUG(DEBUG_AGENTADV, "\tNAI length mismatch - "
                              "ignoring packet\n");
                        return;
                }
                if (memcmp(config.ha_nai, MSG_NAI_DATA(fa_nai),
                           config.ha_nai_len) != 0) {
                        DEBUG(DEBUG_AGENTADV, "\tNAI mismatch - ignoring "
                              "packet\n");
                        return;
                }
                
        }

        if (mn.current_adv != NULL && mn.current_adv->in_use)
                mn.current_adv->in_use = 0;
        mn.current_adv = adv;
        mn.current_adv->in_use = 1;

        mn.cur_route_info.ifindex = mn.cur_route_info.ifindex_net =
                adv->ifindex;
        memcpy(mn.cur_route_info.ifname, adv->ifname, IFNAMSIZ);
        memcpy(mn.cur_route_info.ifname_net, adv->ifname, IFNAMSIZ);
        mn.cur_route_info.known = 1;
        mn.cur_route_info.via.s_addr = config.home_net_gateway.s_addr;

        adv->adv_type = MN_ADV_TYPE_OWN_HA;
        DEBUG(DEBUG_AGENTADV, "\tfrom our own HA - MN is at home\n");
        if (mn.state == MN_FIND_AGENT || mn.state == MN_PASSIVE_FIND ||
            mn.state == MN_REQUEST_TUNNEL || mn.state == MN_CONNECTED) {
                /* FIX: if the co-loc. COA was used, the address of the
                 * interface must be set to the home network settings.
                 * Currently it is assumed that some external program
                 * handles the IP addresses if co-loc. COA is used. */
                DEBUG(DEBUG_INFO, "Deregistering due to the heard "
                      "own HA agent advertisement\n");
                close_for_home(STATE_INIT);
        }
}


/* hashtable iterator for update_fa_decision()
 * searches the entry with largest priority */
static int find_fa_with_priority(struct node *node, void *data)
{
        struct agentadv_data *adv;

        adv = (struct agentadv_data *) node;

        if (monitor_check_policy(NEWEST_ADV_BIT)) {
                /* special case for Newest-ADV policy: just select the latest
                 * received advertisement */
                if (!timerisset(&max_adv_time) ||
                    cmp_timeval(&max_adv_time, &adv->last) < 0) {
                        max_adv_time = adv->last;
                        max_adv = adv;
                }
                return TRUE;
        }

        adv->priority_degraded = adv->priority;
        DEBUG(DEBUG_HANDLERS, "%s priority %i", inet_ntoa(adv->addr), 
              adv->priority_degraded);

        /* degrade priority by degrade percent */
        if (adv->prio_degrade_percent > 0 && adv->priority_degraded > 0) {
                adv->priority_degraded = (int)
                        (adv->priority_degraded *
                         ((100.0 - adv->prio_degrade_percent) / 100.0));
                /* do not totally deny this FA */
                if (adv->priority_degraded == 0)
                        adv->priority_degraded = 1;
                DEBUG(DEBUG_HANDLERS, " => %i (-%i%%)", adv->priority_degraded,
                      adv->prio_degrade_percent);
        }
        DEBUG(DEBUG_HANDLERS, "\n");

        if (adv->priority_degraded > max_priority && !adv->reg_failed &&
            (adv_ok_fa(adv) || adv == mn.current_adv)) {
                max_priority = adv->priority_degraded;
                max_adv = adv;
        }

        return TRUE;
}


/* Called after FA_GET handlers */
static int update_fa_decision(struct agentadv_data *adv)
{
        int same_prio;
        struct timeval now;

        gettimeofday(&now, NULL);

        /* (A) 
         * if we are at home and the HA's agentadv has not expired, do not try
         * to change the FA */
        if ((mn.state == MN_AT_HOME || mn.state == MN_CLOSE_FOR_HOME) &&
            mn.current_adv != NULL &&
            mn.current_adv->addr.s_addr == config.ha_ip_addr.s_addr &&
            mn.current_adv->adv.ext != NULL &&
            ntohs(mn.current_adv->adv.ext->opts) & AGENT_ADV_HOME_AGENT &&
            cmp_timeval(&mn.current_adv->expire, &now) >= 0 &&
            !monitor_check_policy(NEWEST_ADV_BIT)) {
                DEBUG(DEBUG_AGENTADV,
                      "HA agentadv still valid - staying at home\n");
                return FA_GET_NO;
        }

        /* if we are using direct connection to the HA, do not try to change
         * the FA */
        if (mn.tunnel_mode == API_TUNNEL_FULL_HA) {
                DEBUG(DEBUG_AGENTADV, "Direct connection to the HA - ignoring "
                      "FA agent advertisement\n");
                return FA_GET_NO;
        }

        /* Get FA with max priority */
        max_adv = NULL;
        max_priority = 0;
        timerclear(&max_adv_time);

        if (mn.agentadv == NULL) {
                DEBUG(DEBUG_AGENTADV, "update_fa_decision: mn.agentadv == "
                      "NULL\n");
                return FA_GET_NO;
        }
        hashtable_iterator(mn.agentadv, find_fa_with_priority, NULL);
        if (max_adv == NULL) {
                DEBUG(DEBUG_AGENTADV, "update_fa_decision: Can't find FA!\n");
                return FA_GET_NO;
        }

        if (mn.current_adv != NULL) {
                DEBUG(DEBUG_AGENTADV, "CURRENT: %s   ",
                      inet_ntoa(mn.current_adv->addr));
                DEBUG(DEBUG_AGENTADV, "MAX: %s\n",
                      inet_ntoa(max_adv->addr));
        }

        /* (B) 
         * If same priority, don't change */
        /* FIX: How to compare two LFAs. How can we know that they are same
         * JM-FIX: use FA NAI */
        if (mn.current_adv != NULL)
                same_prio = mn.current_adv->priority_degraded == max_priority;
        else
                same_prio = FALSE;
        /* skip priority check if Newest-ADV policy is used */
        if (monitor_check_policy(NEWEST_ADV_BIT))
                same_prio = FALSE;
        if (mn.current_adv != NULL &&
            (same_prio ||
             mn.current_adv->addr.s_addr == max_adv->addr.s_addr)) {
                return FA_GET_SAME; /* no change if same priority or SAME FA */
        }

        /* Change FA. First update the FA information */
        mn.fa_addr.s_addr = max_adv->addr.s_addr;
        memcpy(&mn.co_addr, (max_adv->adv.ext) + 1, sizeof(struct in_addr));
        mn.req_lifetime = ntohs(max_adv->adv.ext->reg_lifetime);
        if (mn.current_adv != NULL)
                mn.current_adv->in_use = 0;
        mn.current_adv = max_adv;
        memcpy(&mn.fa_dynamics_ext, &max_adv->adv.own_ext,
               sizeof(struct agent_adv_dynamics));
        gettimeofday(&timers[TIMER_ADV], NULL);
        timers[TIMER_ADV].tv_sec += ntohs(max_adv->adv.radv->lifetime);

        return FA_GET_CHANGED;
}


/* Get a FA
 * Returns:
 *   0 = FA not found or HA agentadv still valid => do not try to register
 *   1 = new FA found
 *   2 = FA found, but it is the same as the current FA */
int get_fa(struct agentadv_data *adv)
{
        struct event_FA data;

        data.adv = adv;
        data.hash = mn.agentadv;
        handler_call_all(FA_GET, &data);
        return update_fa_decision(adv);
}


static void handle_fa_adv(struct agentadv_data *adv)
{
        struct in_addr _fa_addr, _highest_fa_addr;
        int chg = 0;
        struct event_FA data;

        UNALIGNED_(&_fa_addr.s_addr, &adv->adv.ip->saddr);
        memcpy(&_highest_fa_addr, adv->adv.ext + 1, sizeof(struct in_addr));

        DEBUG(DEBUG_AGENTADV, "FA advertisement - fa_addr=%s, ",
              inet_ntoa(_fa_addr));
        DEBUG(DEBUG_AGENTADV, "highest_fa_addr=%s\n",
              inet_ntoa(_highest_fa_addr));


        /* Call all handlers for this event: FA_ADV_RECEIVE */
        data.adv = adv;
        data.hash = mn.agentadv;
        handler_call_all(FA_ADV_RECEIVE, &data);

        if (mn.state == MN_CONNECTED && ntohs(adv->adv.ext->seq) < 256 &&
            adv->last_heard_seqn >= ntohs(adv->adv.ext->seq)) {
                adv->last_heard_seqn = ntohs(adv->adv.ext->seq);
                DEBUG(DEBUG_INFO, "FA rebooted - trying to reregister\n");
                request_tunnel(STATE_INIT, 0, 0);
                return;
        }

        /* update sequence number */
        adv->last_heard_seqn = ntohs(adv->adv.ext->seq);

        switch (mn.state) {
        case MN_DISCONNECTED:
                break;
        case MN_AT_HOME:
        case MN_CLOSE_FOR_HOME:
                /* try to register to an FA if the HA's agentadv expires */
                if (mn.current_adv == NULL ||
                    mn.current_adv->adv_type != MN_ADV_TYPE_OWN_HA ||
                    adv->adv_type != MN_ADV_TYPE_FA)
                        break;
                if (cmp_timeval(&adv->last, &mn.current_adv->expire) < 0 &&
                    !monitor_check_policy(NEWEST_ADV_BIT))
                        break;

                DEBUG(DEBUG_INFO,
                      "HA agentadv expired - trying to use FA (IP=%s)\n",
                      inet_ntoa(adv->addr));
                /* continue to next case statement.. */
        case MN_FIND_AGENT:
        case MN_PASSIVE_FIND:
        case MN_REQUEST_TUNNEL:
                /* FIX: if the real tunnel is not yet up and the MN gets a
                 * flood of agentadvs from different FAs, there might not be
                 * enough time for the reply to arrive and MN might try to
                 * register to yet another FA.. */
                chg = get_fa(adv);
                if (chg == FA_GET_CHANGED ||
                    (chg == FA_GET_SAME && (real_tunnel_up == 0 ||
                            mn.state != MN_REQUEST_TUNNEL)))
                        request_tunnel(STATE_INIT, 0, 1);
                break;
        case MN_CONNECTED:
                chg = get_fa(adv);
                /* start requesting the tunnel if the current FA's seq#
                 * indicates that the FA has rebooted or if the FA has been
                 * changed */
                if (chg == FA_GET_CHANGED) {
                        request_tunnel(STATE_INIT, 0, 1);
                }
                break;
        default:
                break;
        }
}

/* check_expired_agent_advs:
 *
 * Remove old agent advertisement datas from the memory 
 *
 * Returns: 1 if current agent has expired, else 0
 */
int check_expired_agent_advs(void)
{
        static time_t prev_check = 0;
        struct timeval now;
        struct timeval tmp;
        
        gettimeofday(&now, NULL);

        if (prev_check <= now.tv_sec &&
            now.tv_sec < prev_check + ADV_CLEANUP_FREQ)
                return 0;
                
        prev_check = now.tv_sec;
        current_agent_expired = FALSE;

        tmp.tv_sec = now.tv_sec - ADV_EXTRA_TIME;
        tmp.tv_usec = now.tv_usec;
        DEBUG(DEBUG_AGENTADV,
              "\tchecking for expired agentadv data\n");
        hashtable_iterator(mn.agentadv, clean_agentadv, &tmp);
        
        if (current_agent_expired) {
                DEBUG(DEBUG_AGENTADV, "Current agent's adv. expired - try to "
                      "find new FA\n");
                return 1;
        }
        
        return 0;
}

/* handle incoming agent advertisement
 * Returns:
 *   0 - no extra processing needed
 *   1 - current agent's advertisement has expired
 */
int handle_icmp(struct interface_data *iface)
{
        char buf[MAX_ADV_MSG];
        struct adv_extensions ext;
        struct agentadv_key key;
        struct agentadv_data *adv;
        int res;

        /* return, if message was not for us */
        res = handle_icmp_adv(iface->s_adv, buf, MAX_ADV_MSG, &ext);
        if (res == -1) {
                /* network is down - rescan interfaces */
                check_interfaces(mn.iface, MAX_INTERFACES);
        }

        if (res != 1)
                return 0;

        UNALIGNED_(&key.addr.s_addr, &ext.ip->saddr);

#ifndef MN_FA_FORCE_AFTER_AGENTADV_UPDATE
        if (mn.force_fa_addr.s_addr != 0 &&
            mn.force_fa_addr.s_addr != key.addr.s_addr) {
                DEBUG(DEBUG_AGENTADV,
                      "handle_icmp: force_fa set to %s - ignoring this FA(1)",
                      inet_ntoa(mn.force_fa_addr));
                DEBUG(DEBUG_AGENTADV, " (%s)\n", inet_ntoa(key.addr));
                return 0;
        }
#endif /* MN_FA_FORCE_AFTER_AGENTADV_UPDATE */

        key.ifindex = iface->index;

        if (ntohs(ext.ext->reg_lifetime) < MIN_ALLOWED_LIFETIME) {
                DEBUG(DEBUG_AGENTADV,
                      "handle_icmp: too small lifetime advertised (%d) "
                      "- ignoring this FA (%s)\n",
                      ntohs(ext.ext->reg_lifetime), inet_ntoa(key.addr));
                return 0;
        }

        /* save the last agentadv */
        adv = (struct agentadv_data *)
                hashtable_fetch(mn.agentadv, addr_hash, &key, addr_cmp);
        if (adv == NULL) {
                /* we have no previous information on this mobility agent */
                adv = (struct agentadv_data *)
                        malloc(sizeof(struct agentadv_data));
                if (adv == NULL) {
                        DEBUG(DEBUG_AGENTADV,
                              "handle_icmp: no memory for agentadv data\n");
                        return 0;
                }
                DEBUG(DEBUG_AGENTADV, "Added new agentadv entry for %s\n",
                      inet_ntoa(key.addr));
                memset(adv, 0, sizeof(struct agentadv_data));
                list_init_node(&adv->node);
                UNALIGNED_(&adv->addr.s_addr, &ext.ip->saddr);
                adv->counter = 1;
                adv->prio_degrade_percent = 0; /* don't degrade new FAs! */ 
                if (!hashtable_add(mn.agentadv, addr_hash, &key.addr,
                                   &adv->node)) {
                        DEBUG(DEBUG_AGENTADV,
                              "handle_icmp: hashtable_add failed\n");
                        free(adv);
                        return 0;
                }
        } else {
                /* updating information for previously heard mobility agent */
                DEBUG(DEBUG_AGENTADV, "Used old agentadv entry for %s\n",
                      inet_ntoa(key.addr));
                adv->counter++;
                /* Let FA become slowly "available" again */
                if (adv->prio_degrade_percent > 0)
                        adv->prio_degrade_percent = (int)
                                (adv->prio_degrade_percent*
                                 DEFAULT_PRIO_DEGRADE_DEGRADE);
                /* remove the reg_failed flag if the adv. opts has changed */
                if (adv->reg_failed && ext.ext->opts != adv->adv.ext->opts) {
                        DEBUG(DEBUG_AGENTADV,
                              "Reseting reg_failed for this FA\n");
                        adv->reg_failed = 0;
                }
        }

        adv->ifindex = iface->index;
        dynamics_strlcpy(adv->ifname, iface->device, sizeof(adv->ifname));
        gettimeofday(&adv->last, NULL);
        adv->expire.tv_sec = adv->last.tv_sec + ntohs(ext.radv->lifetime) + 1;
        adv->expire.tv_usec = adv->last.tv_usec;
        DEBUG(DEBUG_AGENTADV, "\tnow=%li.%li, expire=%li.%li\n",
              adv->last.tv_sec, adv->last.tv_usec,
              adv->expire.tv_sec, adv->expire.tv_usec);

        memcpy(adv->buf, buf, MAX_ADV_MSG);
        memcpy(&adv->adv, &ext, sizeof(struct adv_extensions));
        adv->adv.start = adv->buf;
        adv->adv.len = ext.len;
        adv->adv.coaddrs = ext.coaddrs;
        memcpy(&adv->adv.from, &ext.from, sizeof(ext.from));
#define UPDATE_OFFSET(n) adv->adv.n = ext.n ? \
(typeof(ext.n)) (((char *) ext.n) - ext.start + adv->adv.start) : NULL
#ifndef DYN_TARGET_LINUX
        UPDATE_OFFSET(eth);
#endif
        UPDATE_OFFSET(ip);
        UPDATE_OFFSET(radv);
        UPDATE_OFFSET(ext);
        UPDATE_OFFSET(prefix);
        UPDATE_OFFSET(own_ext);
        UPDATE_OFFSET(pubkey_hash);
        UPDATE_OFFSET(fa_nai);
        UPDATE_OFFSET(challenge);

#ifdef MN_FA_FORCE_AFTER_AGENTADV_UPDATE
        if (mn.force_fa_addr.s_addr != 0 &&
            mn.force_fa_addr.s_addr != key.addr.s_addr) {
                DEBUG(DEBUG_AGENTADV,
                      "handle_icmp: force_fa set to %s - ignoring this FA(2)",
                      inet_ntoa(mn.force_fa_addr));
                DEBUG(DEBUG_AGENTADV, " (%s)\n", inet_ntoa(key.addr));
                return 0;
        }
#endif /* MN_FA_FORCE_AFTER_AGENTADV_UPDATE */

        if (ntohs(ext.ext->opts) & AGENT_ADV_HOME_AGENT) {
                adv->adv_type = MN_ADV_TYPE_HA;
                handle_home_adv(adv);
        }
        if (ntohs(ext.ext->opts) & AGENT_ADV_FOREIGN_AGENT) {
                if (adv->adv_type != MN_ADV_TYPE_OWN_HA)
                        adv->adv_type = MN_ADV_TYPE_FA;
                if (ext.coaddrs <= 0)
                        DEBUG(DEBUG_AGENTADV,
                              "handle_icmp: FA adv with no COAs - ignoring\n");
                else
                        handle_fa_adv(adv);
        }

        return 0;
}

---