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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [net/] [ipv4/] [fib_frontend.c] - Blame information for rev 8

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/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              IPv4 Forwarding Information Base: FIB frontend.
 *
 * Version:     $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $
 *
 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *              This program 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 of the License, or (at your option) any later version.
 */
 
#include <linux/module.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/if_addr.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/list.h>
 
#include <net/ip.h>
#include <net/protocol.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/sock.h>
#include <net/icmp.h>
#include <net/arp.h>
#include <net/ip_fib.h>
#include <net/rtnetlink.h>
 
#define FFprint(a...) printk(KERN_DEBUG a)
 
static struct sock *fibnl;
 
#ifndef CONFIG_IP_MULTIPLE_TABLES
 
struct fib_table *ip_fib_local_table;
struct fib_table *ip_fib_main_table;
 
#define FIB_TABLE_HASHSZ 1
static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
 
static void __init fib4_rules_init(void)
{
        ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL);
        hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]);
        ip_fib_main_table  = fib_hash_init(RT_TABLE_MAIN);
        hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]);
}
#else
 
#define FIB_TABLE_HASHSZ 256
static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
 
struct fib_table *fib_new_table(u32 id)
{
        struct fib_table *tb;
        unsigned int h;
 
        if (id == 0)
                id = RT_TABLE_MAIN;
        tb = fib_get_table(id);
        if (tb)
                return tb;
        tb = fib_hash_init(id);
        if (!tb)
                return NULL;
        h = id & (FIB_TABLE_HASHSZ - 1);
        hlist_add_head_rcu(&tb->tb_hlist, &fib_table_hash[h]);
        return tb;
}
 
struct fib_table *fib_get_table(u32 id)
{
        struct fib_table *tb;
        struct hlist_node *node;
        unsigned int h;
 
        if (id == 0)
                id = RT_TABLE_MAIN;
        h = id & (FIB_TABLE_HASHSZ - 1);
        rcu_read_lock();
        hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb_hlist) {
                if (tb->tb_id == id) {
                        rcu_read_unlock();
                        return tb;
                }
        }
        rcu_read_unlock();
        return NULL;
}
#endif /* CONFIG_IP_MULTIPLE_TABLES */
 
static void fib_flush(void)
{
        int flushed = 0;
        struct fib_table *tb;
        struct hlist_node *node;
        unsigned int h;
 
        for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
                hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist)
                        flushed += tb->tb_flush(tb);
        }
 
        if (flushed)
                rt_cache_flush(-1);
}
 
/*
 *      Find the first device with a given source address.
 */
 
struct net_device * ip_dev_find(__be32 addr)
{
        struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
        struct fib_result res;
        struct net_device *dev = NULL;
        struct fib_table *local_table;
 
#ifdef CONFIG_IP_MULTIPLE_TABLES
        res.r = NULL;
#endif
 
        local_table = fib_get_table(RT_TABLE_LOCAL);
        if (!local_table || local_table->tb_lookup(local_table, &fl, &res))
                return NULL;
        if (res.type != RTN_LOCAL)
                goto out;
        dev = FIB_RES_DEV(res);
 
        if (dev)
                dev_hold(dev);
out:
        fib_res_put(&res);
        return dev;
}
 
unsigned inet_addr_type(__be32 addr)
{
        struct flowi            fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
        struct fib_result       res;
        unsigned ret = RTN_BROADCAST;
        struct fib_table *local_table;
 
        if (ZERONET(addr) || BADCLASS(addr))
                return RTN_BROADCAST;
        if (MULTICAST(addr))
                return RTN_MULTICAST;
 
#ifdef CONFIG_IP_MULTIPLE_TABLES
        res.r = NULL;
#endif
 
        local_table = fib_get_table(RT_TABLE_LOCAL);
        if (local_table) {
                ret = RTN_UNICAST;
                if (!local_table->tb_lookup(local_table, &fl, &res)) {
                        ret = res.type;
                        fib_res_put(&res);
                }
        }
        return ret;
}
 
/* Given (packet source, input interface) and optional (dst, oif, tos):
   - (main) check, that source is valid i.e. not broadcast or our local
     address.
   - figure out what "logical" interface this packet arrived
     and calculate "specific destination" address.
   - check, that packet arrived from expected physical interface.
 */
 
int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
                        struct net_device *dev, __be32 *spec_dst, u32 *itag)
{
        struct in_device *in_dev;
        struct flowi fl = { .nl_u = { .ip4_u =
                                      { .daddr = src,
                                        .saddr = dst,
                                        .tos = tos } },
                            .iif = oif };
        struct fib_result res;
        int no_addr, rpf;
        int ret;
 
        no_addr = rpf = 0;
        rcu_read_lock();
        in_dev = __in_dev_get_rcu(dev);
        if (in_dev) {
                no_addr = in_dev->ifa_list == NULL;
                rpf = IN_DEV_RPFILTER(in_dev);
        }
        rcu_read_unlock();
 
        if (in_dev == NULL)
                goto e_inval;
 
        if (fib_lookup(&fl, &res))
                goto last_resort;
        if (res.type != RTN_UNICAST)
                goto e_inval_res;
        *spec_dst = FIB_RES_PREFSRC(res);
        fib_combine_itag(itag, &res);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
        if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1)
#else
        if (FIB_RES_DEV(res) == dev)
#endif
        {
                ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
                fib_res_put(&res);
                return ret;
        }
        fib_res_put(&res);
        if (no_addr)
                goto last_resort;
        if (rpf)
                goto e_inval;
        fl.oif = dev->ifindex;
 
        ret = 0;
        if (fib_lookup(&fl, &res) == 0) {
                if (res.type == RTN_UNICAST) {
                        *spec_dst = FIB_RES_PREFSRC(res);
                        ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
                }
                fib_res_put(&res);
        }
        return ret;
 
last_resort:
        if (rpf)
                goto e_inval;
        *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
        *itag = 0;
        return 0;
 
e_inval_res:
        fib_res_put(&res);
e_inval:
        return -EINVAL;
}
 
static inline __be32 sk_extract_addr(struct sockaddr *addr)
{
        return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
}
 
static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
{
        struct nlattr *nla;
 
        nla = (struct nlattr *) ((char *) mx + len);
        nla->nla_type = type;
        nla->nla_len = nla_attr_size(4);
        *(u32 *) nla_data(nla) = value;
 
        return len + nla_total_size(4);
}
 
static int rtentry_to_fib_config(int cmd, struct rtentry *rt,
                                 struct fib_config *cfg)
{
        __be32 addr;
        int plen;
 
        memset(cfg, 0, sizeof(*cfg));
 
        if (rt->rt_dst.sa_family != AF_INET)
                return -EAFNOSUPPORT;
 
        /*
         * Check mask for validity:
         * a) it must be contiguous.
         * b) destination must have all host bits clear.
         * c) if application forgot to set correct family (AF_INET),
         *    reject request unless it is absolutely clear i.e.
         *    both family and mask are zero.
         */
        plen = 32;
        addr = sk_extract_addr(&rt->rt_dst);
        if (!(rt->rt_flags & RTF_HOST)) {
                __be32 mask = sk_extract_addr(&rt->rt_genmask);
 
                if (rt->rt_genmask.sa_family != AF_INET) {
                        if (mask || rt->rt_genmask.sa_family)
                                return -EAFNOSUPPORT;
                }
 
                if (bad_mask(mask, addr))
                        return -EINVAL;
 
                plen = inet_mask_len(mask);
        }
 
        cfg->fc_dst_len = plen;
        cfg->fc_dst = addr;
 
        if (cmd != SIOCDELRT) {
                cfg->fc_nlflags = NLM_F_CREATE;
                cfg->fc_protocol = RTPROT_BOOT;
        }
 
        if (rt->rt_metric)
                cfg->fc_priority = rt->rt_metric - 1;
 
        if (rt->rt_flags & RTF_REJECT) {
                cfg->fc_scope = RT_SCOPE_HOST;
                cfg->fc_type = RTN_UNREACHABLE;
                return 0;
        }
 
        cfg->fc_scope = RT_SCOPE_NOWHERE;
        cfg->fc_type = RTN_UNICAST;
 
        if (rt->rt_dev) {
                char *colon;
                struct net_device *dev;
                char devname[IFNAMSIZ];
 
                if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
                        return -EFAULT;
 
                devname[IFNAMSIZ-1] = 0;
                colon = strchr(devname, ':');
                if (colon)
                        *colon = 0;
                dev = __dev_get_by_name(&init_net, devname);
                if (!dev)
                        return -ENODEV;
                cfg->fc_oif = dev->ifindex;
                if (colon) {
                        struct in_ifaddr *ifa;
                        struct in_device *in_dev = __in_dev_get_rtnl(dev);
                        if (!in_dev)
                                return -ENODEV;
                        *colon = ':';
                        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
                                if (strcmp(ifa->ifa_label, devname) == 0)
                                        break;
                        if (ifa == NULL)
                                return -ENODEV;
                        cfg->fc_prefsrc = ifa->ifa_local;
                }
        }
 
        addr = sk_extract_addr(&rt->rt_gateway);
        if (rt->rt_gateway.sa_family == AF_INET && addr) {
                cfg->fc_gw = addr;
                if (rt->rt_flags & RTF_GATEWAY &&
                    inet_addr_type(addr) == RTN_UNICAST)
                        cfg->fc_scope = RT_SCOPE_UNIVERSE;
        }
 
        if (cmd == SIOCDELRT)
                return 0;
 
        if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
                return -EINVAL;
 
        if (cfg->fc_scope == RT_SCOPE_NOWHERE)
                cfg->fc_scope = RT_SCOPE_LINK;
 
        if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
                struct nlattr *mx;
                int len = 0;
 
                mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
                if (mx == NULL)
                        return -ENOMEM;
 
                if (rt->rt_flags & RTF_MTU)
                        len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
 
                if (rt->rt_flags & RTF_WINDOW)
                        len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
 
                if (rt->rt_flags & RTF_IRTT)
                        len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
 
                cfg->fc_mx = mx;
                cfg->fc_mx_len = len;
        }
 
        return 0;
}
 
/*
 *      Handle IP routing ioctl calls. These are used to manipulate the routing tables
 */
 
int ip_rt_ioctl(unsigned int cmd, void __user *arg)
{
        struct fib_config cfg;
        struct rtentry rt;
        int err;
 
        switch (cmd) {
        case SIOCADDRT:         /* Add a route */
        case SIOCDELRT:         /* Delete a route */
                if (!capable(CAP_NET_ADMIN))
                        return -EPERM;
 
                if (copy_from_user(&rt, arg, sizeof(rt)))
                        return -EFAULT;
 
                rtnl_lock();
                err = rtentry_to_fib_config(cmd, &rt, &cfg);
                if (err == 0) {
                        struct fib_table *tb;
 
                        if (cmd == SIOCDELRT) {
                                tb = fib_get_table(cfg.fc_table);
                                if (tb)
                                        err = tb->tb_delete(tb, &cfg);
                                else
                                        err = -ESRCH;
                        } else {
                                tb = fib_new_table(cfg.fc_table);
                                if (tb)
                                        err = tb->tb_insert(tb, &cfg);
                                else
                                        err = -ENOBUFS;
                        }
 
                        /* allocated by rtentry_to_fib_config() */
                        kfree(cfg.fc_mx);
                }
                rtnl_unlock();
                return err;
        }
        return -EINVAL;
}
 
const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = {
        [RTA_DST]               = { .type = NLA_U32 },
        [RTA_SRC]               = { .type = NLA_U32 },
        [RTA_IIF]               = { .type = NLA_U32 },
        [RTA_OIF]               = { .type = NLA_U32 },
        [RTA_GATEWAY]           = { .type = NLA_U32 },
        [RTA_PRIORITY]          = { .type = NLA_U32 },
        [RTA_PREFSRC]           = { .type = NLA_U32 },
        [RTA_METRICS]           = { .type = NLA_NESTED },
        [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
        [RTA_PROTOINFO]         = { .type = NLA_U32 },
        [RTA_FLOW]              = { .type = NLA_U32 },
};
 
static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh,
                             struct fib_config *cfg)
{
        struct nlattr *attr;
        int err, remaining;
        struct rtmsg *rtm;
 
        err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
        if (err < 0)
                goto errout;
 
        memset(cfg, 0, sizeof(*cfg));
 
        rtm = nlmsg_data(nlh);
        cfg->fc_dst_len = rtm->rtm_dst_len;
        cfg->fc_tos = rtm->rtm_tos;
        cfg->fc_table = rtm->rtm_table;
        cfg->fc_protocol = rtm->rtm_protocol;
        cfg->fc_scope = rtm->rtm_scope;
        cfg->fc_type = rtm->rtm_type;
        cfg->fc_flags = rtm->rtm_flags;
        cfg->fc_nlflags = nlh->nlmsg_flags;
 
        cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
        cfg->fc_nlinfo.nlh = nlh;
 
        if (cfg->fc_type > RTN_MAX) {
                err = -EINVAL;
                goto errout;
        }
 
        nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
                switch (nla_type(attr)) {
                case RTA_DST:
                        cfg->fc_dst = nla_get_be32(attr);
                        break;
                case RTA_OIF:
                        cfg->fc_oif = nla_get_u32(attr);
                        break;
                case RTA_GATEWAY:
                        cfg->fc_gw = nla_get_be32(attr);
                        break;
                case RTA_PRIORITY:
                        cfg->fc_priority = nla_get_u32(attr);
                        break;
                case RTA_PREFSRC:
                        cfg->fc_prefsrc = nla_get_be32(attr);
                        break;
                case RTA_METRICS:
                        cfg->fc_mx = nla_data(attr);
                        cfg->fc_mx_len = nla_len(attr);
                        break;
                case RTA_MULTIPATH:
                        cfg->fc_mp = nla_data(attr);
                        cfg->fc_mp_len = nla_len(attr);
                        break;
                case RTA_FLOW:
                        cfg->fc_flow = nla_get_u32(attr);
                        break;
                case RTA_TABLE:
                        cfg->fc_table = nla_get_u32(attr);
                        break;
                }
        }
 
        return 0;
errout:
        return err;
}
 
static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
        struct fib_config cfg;
        struct fib_table *tb;
        int err;
 
        err = rtm_to_fib_config(skb, nlh, &cfg);
        if (err < 0)
                goto errout;
 
        tb = fib_get_table(cfg.fc_table);
        if (tb == NULL) {
                err = -ESRCH;
                goto errout;
        }
 
        err = tb->tb_delete(tb, &cfg);
errout:
        return err;
}
 
static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
        struct fib_config cfg;
        struct fib_table *tb;
        int err;
 
        err = rtm_to_fib_config(skb, nlh, &cfg);
        if (err < 0)
                goto errout;
 
        tb = fib_new_table(cfg.fc_table);
        if (tb == NULL) {
                err = -ENOBUFS;
                goto errout;
        }
 
        err = tb->tb_insert(tb, &cfg);
errout:
        return err;
}
 
static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
{
        unsigned int h, s_h;
        unsigned int e = 0, s_e;
        struct fib_table *tb;
        struct hlist_node *node;
        int dumped = 0;
 
        if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
            ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
                return ip_rt_dump(skb, cb);
 
        s_h = cb->args[0];
        s_e = cb->args[1];
 
        for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
                e = 0;
                hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) {
                        if (e < s_e)
                                goto next;
                        if (dumped)
                                memset(&cb->args[2], 0, sizeof(cb->args) -
                                                 2 * sizeof(cb->args[0]));
                        if (tb->tb_dump(tb, skb, cb) < 0)
                                goto out;
                        dumped = 1;
next:
                        e++;
                }
        }
out:
        cb->args[1] = e;
        cb->args[0] = h;
 
        return skb->len;
}
 
/* Prepare and feed intra-kernel routing request.
   Really, it should be netlink message, but :-( netlink
   can be not configured, so that we feed it directly
   to fib engine. It is legal, because all events occur
   only when netlink is already locked.
 */
 
static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
{
        struct fib_table *tb;
        struct fib_config cfg = {
                .fc_protocol = RTPROT_KERNEL,
                .fc_type = type,
                .fc_dst = dst,
                .fc_dst_len = dst_len,
                .fc_prefsrc = ifa->ifa_local,
                .fc_oif = ifa->ifa_dev->dev->ifindex,
                .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
        };
 
        if (type == RTN_UNICAST)
                tb = fib_new_table(RT_TABLE_MAIN);
        else
                tb = fib_new_table(RT_TABLE_LOCAL);
 
        if (tb == NULL)
                return;
 
        cfg.fc_table = tb->tb_id;
 
        if (type != RTN_LOCAL)
                cfg.fc_scope = RT_SCOPE_LINK;
        else
                cfg.fc_scope = RT_SCOPE_HOST;
 
        if (cmd == RTM_NEWROUTE)
                tb->tb_insert(tb, &cfg);
        else
                tb->tb_delete(tb, &cfg);
}
 
void fib_add_ifaddr(struct in_ifaddr *ifa)
{
        struct in_device *in_dev = ifa->ifa_dev;
        struct net_device *dev = in_dev->dev;
        struct in_ifaddr *prim = ifa;
        __be32 mask = ifa->ifa_mask;
        __be32 addr = ifa->ifa_local;
        __be32 prefix = ifa->ifa_address&mask;
 
        if (ifa->ifa_flags&IFA_F_SECONDARY) {
                prim = inet_ifa_byprefix(in_dev, prefix, mask);
                if (prim == NULL) {
                        printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n");
                        return;
                }
        }
 
        fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
 
        if (!(dev->flags&IFF_UP))
                return;
 
        /* Add broadcast address, if it is explicitly assigned. */
        if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
                fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
 
        if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) &&
            (prefix != addr || ifa->ifa_prefixlen < 32)) {
                fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
                          RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim);
 
                /* Add network specific broadcasts, when it takes a sense */
                if (ifa->ifa_prefixlen < 31) {
                        fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
                        fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim);
                }
        }
}
 
static void fib_del_ifaddr(struct in_ifaddr *ifa)
{
        struct in_device *in_dev = ifa->ifa_dev;
        struct net_device *dev = in_dev->dev;
        struct in_ifaddr *ifa1;
        struct in_ifaddr *prim = ifa;
        __be32 brd = ifa->ifa_address|~ifa->ifa_mask;
        __be32 any = ifa->ifa_address&ifa->ifa_mask;
#define LOCAL_OK        1
#define BRD_OK          2
#define BRD0_OK         4
#define BRD1_OK         8
        unsigned ok = 0;
 
        if (!(ifa->ifa_flags&IFA_F_SECONDARY))
                fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
                          RTN_UNICAST, any, ifa->ifa_prefixlen, prim);
        else {
                prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
                if (prim == NULL) {
                        printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n");
                        return;
                }
        }
 
        /* Deletion is more complicated than add.
           We should take care of not to delete too much :-)
 
           Scan address list to be sure that addresses are really gone.
         */
 
        for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
                if (ifa->ifa_local == ifa1->ifa_local)
                        ok |= LOCAL_OK;
                if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
                        ok |= BRD_OK;
                if (brd == ifa1->ifa_broadcast)
                        ok |= BRD1_OK;
                if (any == ifa1->ifa_broadcast)
                        ok |= BRD0_OK;
        }
 
        if (!(ok&BRD_OK))
                fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
        if (!(ok&BRD1_OK))
                fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
        if (!(ok&BRD0_OK))
                fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
        if (!(ok&LOCAL_OK)) {
                fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
 
                /* Check, that this local address finally disappeared. */
                if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
                        /* And the last, but not the least thing.
                           We must flush stray FIB entries.
 
                           First of all, we scan fib_info list searching
                           for stray nexthop entries, then ignite fib_flush.
                        */
                        if (fib_sync_down(ifa->ifa_local, NULL, 0))
                                fib_flush();
                }
        }
#undef LOCAL_OK
#undef BRD_OK
#undef BRD0_OK
#undef BRD1_OK
}
 
static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb )
{
 
        struct fib_result       res;
        struct flowi            fl = { .mark = frn->fl_mark,
                                       .nl_u = { .ip4_u = { .daddr = frn->fl_addr,
                                                            .tos = frn->fl_tos,
                                                            .scope = frn->fl_scope } } };
 
#ifdef CONFIG_IP_MULTIPLE_TABLES
        res.r = NULL;
#endif
 
        frn->err = -ENOENT;
        if (tb) {
                local_bh_disable();
 
                frn->tb_id = tb->tb_id;
                frn->err = tb->tb_lookup(tb, &fl, &res);
 
                if (!frn->err) {
                        frn->prefixlen = res.prefixlen;
                        frn->nh_sel = res.nh_sel;
                        frn->type = res.type;
                        frn->scope = res.scope;
                        fib_res_put(&res);
                }
                local_bh_enable();
        }
}
 
static void nl_fib_input(struct sk_buff *skb)
{
        struct fib_result_nl *frn;
        struct nlmsghdr *nlh;
        struct fib_table *tb;
        u32 pid;
 
        nlh = nlmsg_hdr(skb);
        if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
            nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
                return;
 
        skb = skb_clone(skb, GFP_KERNEL);
        if (skb == NULL)
                return;
        nlh = nlmsg_hdr(skb);
 
        frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
        tb = fib_get_table(frn->tb_id_in);
 
        nl_fib_lookup(frn, tb);
 
        pid = NETLINK_CB(skb).pid;       /* pid of sending process */
        NETLINK_CB(skb).pid = 0;         /* from kernel */
        NETLINK_CB(skb).dst_group = 0;  /* unicast */
        netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT);
}
 
static void nl_fib_lookup_init(void)
{
        fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0,
                                      nl_fib_input, NULL, THIS_MODULE);
}
 
static void fib_disable_ip(struct net_device *dev, int force)
{
        if (fib_sync_down(0, dev, force))
                fib_flush();
        rt_cache_flush(0);
        arp_ifdown(dev);
}
 
static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
{
        struct in_ifaddr *ifa = (struct in_ifaddr*)ptr;
 
        switch (event) {
        case NETDEV_UP:
                fib_add_ifaddr(ifa);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
                fib_sync_up(ifa->ifa_dev->dev);
#endif
                rt_cache_flush(-1);
                break;
        case NETDEV_DOWN:
                fib_del_ifaddr(ifa);
                if (ifa->ifa_dev->ifa_list == NULL) {
                        /* Last address was deleted from this interface.
                           Disable IP.
                         */
                        fib_disable_ip(ifa->ifa_dev->dev, 1);
                } else {
                        rt_cache_flush(-1);
                }
                break;
        }
        return NOTIFY_DONE;
}
 
static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
{
        struct net_device *dev = ptr;
        struct in_device *in_dev = __in_dev_get_rtnl(dev);
 
        if (dev->nd_net != &init_net)
                return NOTIFY_DONE;
 
        if (event == NETDEV_UNREGISTER) {
                fib_disable_ip(dev, 2);
                return NOTIFY_DONE;
        }
 
        if (!in_dev)
                return NOTIFY_DONE;
 
        switch (event) {
        case NETDEV_UP:
                for_ifa(in_dev) {
                        fib_add_ifaddr(ifa);
                } endfor_ifa(in_dev);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
                fib_sync_up(dev);
#endif
                rt_cache_flush(-1);
                break;
        case NETDEV_DOWN:
                fib_disable_ip(dev, 0);
                break;
        case NETDEV_CHANGEMTU:
        case NETDEV_CHANGE:
                rt_cache_flush(0);
                break;
        }
        return NOTIFY_DONE;
}
 
static struct notifier_block fib_inetaddr_notifier = {
        .notifier_call =fib_inetaddr_event,
};
 
static struct notifier_block fib_netdev_notifier = {
        .notifier_call =fib_netdev_event,
};
 
void __init ip_fib_init(void)
{
        unsigned int i;
 
        for (i = 0; i < FIB_TABLE_HASHSZ; i++)
                INIT_HLIST_HEAD(&fib_table_hash[i]);
 
        fib4_rules_init();
 
        register_netdevice_notifier(&fib_netdev_notifier);
        register_inetaddr_notifier(&fib_inetaddr_notifier);
        nl_fib_lookup_init();
 
        rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL);
        rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL);
        rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib);
}
 
EXPORT_SYMBOL(inet_addr_type);
EXPORT_SYMBOL(ip_dev_find);
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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [net/] [ipv4/] [fib_frontend.c] - Blame information for rev 8

Line No.	Rev	Author	Line
1	3	xianfeng	`/*`
2			`* INET An implementation of the TCP/IP protocol suite for the LINUX`
3			`* operating system. INET is implemented using the BSD Socket`
4			`* interface as the means of communication with the user level.`
5			`*`
6			`* IPv4 Forwarding Information Base: FIB frontend.`
7			`*`
8			`* Version: $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $`
9			`*`
10			`* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>`
11			`*`
12			`* This program is free software; you can redistribute it and/or`
13			`* modify it under the terms of the GNU General Public License`
14			`* as published by the Free Software Foundation; either version`
15			`* 2 of the License, or (at your option) any later version.`
16			`*/`
17
18			`#include <linux/module.h>`
19			`#include <asm/uaccess.h>`
20			`#include <asm/system.h>`
21			`#include <linux/bitops.h>`
22			`#include <linux/capability.h>`
23			`#include <linux/types.h>`
24			`#include <linux/kernel.h>`
25			`#include <linux/mm.h>`
26			`#include <linux/string.h>`
27			`#include <linux/socket.h>`
28			`#include <linux/sockios.h>`
29			`#include <linux/errno.h>`
30			`#include <linux/in.h>`
31			`#include <linux/inet.h>`
32			`#include <linux/inetdevice.h>`
33			`#include <linux/netdevice.h>`
34			`#include <linux/if_addr.h>`
35			`#include <linux/if_arp.h>`
36			`#include <linux/skbuff.h>`
37			`#include <linux/init.h>`
38			`#include <linux/list.h>`
39
40			`#include <net/ip.h>`