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![Vegard Nossum](/assets/img/avatar_default.png)
dn_fib_count_nhs() could enter an infinite loop if nhp->rtnh_len == 0 (i.e. if userspace passes a malformed netlink message). Let's use the helpers from net/nexthop.h which take care of all this stuff. We can do exactly the same as e.g. fib_count_nexthops() and fib_get_nhs() from net/ipv4/fib_semantics.c. This fixes the softlockup for me. Cc: Thomas Graf <tgraf@suug.ch> Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
794 lines
18 KiB
C
794 lines
18 KiB
C
/*
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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* operating system. DECnet is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* DECnet Routing Forwarding Information Base (Glue/Info List)
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*
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* Author: Steve Whitehouse <SteveW@ACM.org>
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*
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*
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* Changes:
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* Alexey Kuznetsov : SMP locking changes
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* Steve Whitehouse : Rewrote it... Well to be more correct, I
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* copied most of it from the ipv4 fib code.
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* Steve Whitehouse : Updated it in style and fixed a few bugs
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* which were fixed in the ipv4 code since
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* this code was copied from it.
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*
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*/
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#include <linux/string.h>
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#include <linux/net.h>
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#include <linux/socket.h>
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#include <linux/slab.h>
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#include <linux/sockios.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/proc_fs.h>
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#include <linux/netdevice.h>
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#include <linux/timer.h>
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#include <linux/spinlock.h>
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#include <linux/atomic.h>
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#include <asm/uaccess.h>
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#include <net/neighbour.h>
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#include <net/dst.h>
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#include <net/flow.h>
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#include <net/fib_rules.h>
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#include <net/dn.h>
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#include <net/dn_route.h>
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#include <net/dn_fib.h>
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#include <net/dn_neigh.h>
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#include <net/dn_dev.h>
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#include <net/nexthop.h>
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#define RT_MIN_TABLE 1
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#define for_fib_info() { struct dn_fib_info *fi;\
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for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
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#define endfor_fib_info() }
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#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
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for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
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#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
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for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
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#define endfor_nexthops(fi) }
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static DEFINE_SPINLOCK(dn_fib_multipath_lock);
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static struct dn_fib_info *dn_fib_info_list;
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static DEFINE_SPINLOCK(dn_fib_info_lock);
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static struct
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{
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int error;
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u8 scope;
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} dn_fib_props[RTN_MAX+1] = {
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[RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
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[RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
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[RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
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[RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
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[RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
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[RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
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[RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
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[RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
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[RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
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[RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
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[RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
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[RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
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};
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static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
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static int dn_fib_sync_up(struct net_device *dev);
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void dn_fib_free_info(struct dn_fib_info *fi)
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{
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if (fi->fib_dead == 0) {
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printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
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return;
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}
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change_nexthops(fi) {
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if (nh->nh_dev)
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dev_put(nh->nh_dev);
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nh->nh_dev = NULL;
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} endfor_nexthops(fi);
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kfree(fi);
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}
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void dn_fib_release_info(struct dn_fib_info *fi)
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{
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spin_lock(&dn_fib_info_lock);
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if (fi && --fi->fib_treeref == 0) {
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if (fi->fib_next)
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fi->fib_next->fib_prev = fi->fib_prev;
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if (fi->fib_prev)
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fi->fib_prev->fib_next = fi->fib_next;
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if (fi == dn_fib_info_list)
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dn_fib_info_list = fi->fib_next;
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fi->fib_dead = 1;
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dn_fib_info_put(fi);
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}
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spin_unlock(&dn_fib_info_lock);
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}
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static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
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{
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const struct dn_fib_nh *onh = ofi->fib_nh;
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for_nexthops(fi) {
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if (nh->nh_oif != onh->nh_oif ||
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nh->nh_gw != onh->nh_gw ||
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nh->nh_scope != onh->nh_scope ||
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nh->nh_weight != onh->nh_weight ||
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((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
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return -1;
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onh++;
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} endfor_nexthops(fi);
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return 0;
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}
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static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
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{
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for_fib_info() {
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if (fi->fib_nhs != nfi->fib_nhs)
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continue;
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if (nfi->fib_protocol == fi->fib_protocol &&
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nfi->fib_prefsrc == fi->fib_prefsrc &&
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nfi->fib_priority == fi->fib_priority &&
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memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
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((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
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(nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
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return fi;
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} endfor_fib_info();
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return NULL;
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}
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static int dn_fib_count_nhs(const struct nlattr *attr)
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{
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struct rtnexthop *nhp = nla_data(attr);
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int nhs = 0, nhlen = nla_len(attr);
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while (rtnh_ok(nhp, nhlen)) {
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nhs++;
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nhp = rtnh_next(nhp, &nhlen);
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}
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/* leftover implies invalid nexthop configuration, discard it */
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return nhlen > 0 ? 0 : nhs;
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}
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static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr,
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const struct rtmsg *r)
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{
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struct rtnexthop *nhp = nla_data(attr);
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int nhlen = nla_len(attr);
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change_nexthops(fi) {
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int attrlen;
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if (!rtnh_ok(nhp, nhlen))
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return -EINVAL;
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nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
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nh->nh_oif = nhp->rtnh_ifindex;
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nh->nh_weight = nhp->rtnh_hops + 1;
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attrlen = rtnh_attrlen(nhp);
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if (attrlen > 0) {
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struct nlattr *gw_attr;
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gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
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nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
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}
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nhp = rtnh_next(nhp, &nhlen);
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} endfor_nexthops(fi);
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return 0;
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}
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static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
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{
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int err;
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if (nh->nh_gw) {
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struct flowidn fld;
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struct dn_fib_res res;
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if (nh->nh_flags&RTNH_F_ONLINK) {
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struct net_device *dev;
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if (r->rtm_scope >= RT_SCOPE_LINK)
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return -EINVAL;
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if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
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return -EINVAL;
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if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
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return -ENODEV;
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if (!(dev->flags&IFF_UP))
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return -ENETDOWN;
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nh->nh_dev = dev;
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dev_hold(dev);
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nh->nh_scope = RT_SCOPE_LINK;
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return 0;
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}
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memset(&fld, 0, sizeof(fld));
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fld.daddr = nh->nh_gw;
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fld.flowidn_oif = nh->nh_oif;
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fld.flowidn_scope = r->rtm_scope + 1;
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if (fld.flowidn_scope < RT_SCOPE_LINK)
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fld.flowidn_scope = RT_SCOPE_LINK;
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if ((err = dn_fib_lookup(&fld, &res)) != 0)
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return err;
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err = -EINVAL;
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if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
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goto out;
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nh->nh_scope = res.scope;
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nh->nh_oif = DN_FIB_RES_OIF(res);
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nh->nh_dev = DN_FIB_RES_DEV(res);
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if (nh->nh_dev == NULL)
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goto out;
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dev_hold(nh->nh_dev);
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err = -ENETDOWN;
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if (!(nh->nh_dev->flags & IFF_UP))
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goto out;
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err = 0;
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out:
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dn_fib_res_put(&res);
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return err;
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} else {
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struct net_device *dev;
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if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
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return -EINVAL;
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dev = __dev_get_by_index(&init_net, nh->nh_oif);
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if (dev == NULL || dev->dn_ptr == NULL)
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return -ENODEV;
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if (!(dev->flags&IFF_UP))
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return -ENETDOWN;
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nh->nh_dev = dev;
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dev_hold(nh->nh_dev);
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nh->nh_scope = RT_SCOPE_HOST;
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}
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return 0;
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}
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struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
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const struct nlmsghdr *nlh, int *errp)
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{
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int err;
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struct dn_fib_info *fi = NULL;
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struct dn_fib_info *ofi;
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int nhs = 1;
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if (r->rtm_type > RTN_MAX)
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goto err_inval;
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if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
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goto err_inval;
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if (attrs[RTA_MULTIPATH] &&
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(nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
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goto err_inval;
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fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
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err = -ENOBUFS;
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if (fi == NULL)
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goto failure;
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fi->fib_protocol = r->rtm_protocol;
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fi->fib_nhs = nhs;
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fi->fib_flags = r->rtm_flags;
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if (attrs[RTA_PRIORITY])
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fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
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if (attrs[RTA_METRICS]) {
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struct nlattr *attr;
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int rem;
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nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
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int type = nla_type(attr);
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if (type) {
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if (type > RTAX_MAX || type == RTAX_CC_ALGO ||
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nla_len(attr) < 4)
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goto err_inval;
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fi->fib_metrics[type-1] = nla_get_u32(attr);
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}
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}
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}
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if (attrs[RTA_PREFSRC])
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fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
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if (attrs[RTA_MULTIPATH]) {
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if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
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goto failure;
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if (attrs[RTA_OIF] &&
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fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
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goto err_inval;
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if (attrs[RTA_GATEWAY] &&
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fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
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goto err_inval;
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} else {
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struct dn_fib_nh *nh = fi->fib_nh;
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if (attrs[RTA_OIF])
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nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
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if (attrs[RTA_GATEWAY])
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nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
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nh->nh_flags = r->rtm_flags;
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nh->nh_weight = 1;
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}
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if (r->rtm_type == RTN_NAT) {
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if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
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goto err_inval;
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fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
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goto link_it;
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}
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if (dn_fib_props[r->rtm_type].error) {
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if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
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goto err_inval;
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goto link_it;
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}
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if (r->rtm_scope > RT_SCOPE_HOST)
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goto err_inval;
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if (r->rtm_scope == RT_SCOPE_HOST) {
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struct dn_fib_nh *nh = fi->fib_nh;
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/* Local address is added */
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if (nhs != 1 || nh->nh_gw)
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goto err_inval;
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nh->nh_scope = RT_SCOPE_NOWHERE;
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nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
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err = -ENODEV;
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if (nh->nh_dev == NULL)
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goto failure;
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} else {
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change_nexthops(fi) {
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if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
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goto failure;
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} endfor_nexthops(fi)
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}
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if (fi->fib_prefsrc) {
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if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
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fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
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if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
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goto err_inval;
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}
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link_it:
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if ((ofi = dn_fib_find_info(fi)) != NULL) {
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fi->fib_dead = 1;
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dn_fib_free_info(fi);
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ofi->fib_treeref++;
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return ofi;
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}
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fi->fib_treeref++;
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atomic_inc(&fi->fib_clntref);
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spin_lock(&dn_fib_info_lock);
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fi->fib_next = dn_fib_info_list;
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fi->fib_prev = NULL;
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if (dn_fib_info_list)
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dn_fib_info_list->fib_prev = fi;
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dn_fib_info_list = fi;
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spin_unlock(&dn_fib_info_lock);
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return fi;
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err_inval:
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err = -EINVAL;
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failure:
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*errp = err;
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if (fi) {
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fi->fib_dead = 1;
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dn_fib_free_info(fi);
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}
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return NULL;
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}
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int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
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{
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int err = dn_fib_props[type].error;
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if (err == 0) {
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if (fi->fib_flags & RTNH_F_DEAD)
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return 1;
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res->fi = fi;
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switch (type) {
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case RTN_NAT:
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DN_FIB_RES_RESET(*res);
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atomic_inc(&fi->fib_clntref);
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return 0;
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case RTN_UNICAST:
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case RTN_LOCAL:
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for_nexthops(fi) {
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if (nh->nh_flags & RTNH_F_DEAD)
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continue;
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if (!fld->flowidn_oif ||
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fld->flowidn_oif == nh->nh_oif)
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break;
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}
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if (nhsel < fi->fib_nhs) {
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res->nh_sel = nhsel;
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atomic_inc(&fi->fib_clntref);
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return 0;
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}
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endfor_nexthops(fi);
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res->fi = NULL;
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return 1;
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default:
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net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
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type);
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res->fi = NULL;
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return -EINVAL;
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}
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}
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return err;
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}
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void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
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{
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struct dn_fib_info *fi = res->fi;
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int w;
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|
|
spin_lock_bh(&dn_fib_multipath_lock);
|
|
if (fi->fib_power <= 0) {
|
|
int power = 0;
|
|
change_nexthops(fi) {
|
|
if (!(nh->nh_flags&RTNH_F_DEAD)) {
|
|
power += nh->nh_weight;
|
|
nh->nh_power = nh->nh_weight;
|
|
}
|
|
} endfor_nexthops(fi);
|
|
fi->fib_power = power;
|
|
if (power < 0) {
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
res->nh_sel = 0;
|
|
return;
|
|
}
|
|
}
|
|
|
|
w = jiffies % fi->fib_power;
|
|
|
|
change_nexthops(fi) {
|
|
if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
|
|
if ((w -= nh->nh_power) <= 0) {
|
|
nh->nh_power--;
|
|
fi->fib_power--;
|
|
res->nh_sel = nhsel;
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
return;
|
|
}
|
|
}
|
|
} endfor_nexthops(fi);
|
|
res->nh_sel = 0;
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
}
|
|
|
|
static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
|
|
{
|
|
if (attrs[RTA_TABLE])
|
|
table = nla_get_u32(attrs[RTA_TABLE]);
|
|
|
|
return table;
|
|
}
|
|
|
|
static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct dn_fib_table *tb;
|
|
struct rtmsg *r = nlmsg_data(nlh);
|
|
struct nlattr *attrs[RTA_MAX+1];
|
|
int err;
|
|
|
|
if (!netlink_capable(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EINVAL;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
|
|
if (!tb)
|
|
return -ESRCH;
|
|
|
|
return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
|
|
}
|
|
|
|
static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct dn_fib_table *tb;
|
|
struct rtmsg *r = nlmsg_data(nlh);
|
|
struct nlattr *attrs[RTA_MAX+1];
|
|
int err;
|
|
|
|
if (!netlink_capable(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EINVAL;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
|
|
if (!tb)
|
|
return -ENOBUFS;
|
|
|
|
return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
|
|
}
|
|
|
|
static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
|
|
{
|
|
struct dn_fib_table *tb;
|
|
struct {
|
|
struct nlmsghdr nlh;
|
|
struct rtmsg rtm;
|
|
} req;
|
|
struct {
|
|
struct nlattr hdr;
|
|
__le16 dst;
|
|
} dst_attr = {
|
|
.dst = dst,
|
|
};
|
|
struct {
|
|
struct nlattr hdr;
|
|
__le16 prefsrc;
|
|
} prefsrc_attr = {
|
|
.prefsrc = ifa->ifa_local,
|
|
};
|
|
struct {
|
|
struct nlattr hdr;
|
|
u32 oif;
|
|
} oif_attr = {
|
|
.oif = ifa->ifa_dev->dev->ifindex,
|
|
};
|
|
struct nlattr *attrs[RTA_MAX+1] = {
|
|
[RTA_DST] = (struct nlattr *) &dst_attr,
|
|
[RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
|
|
[RTA_OIF] = (struct nlattr *) &oif_attr,
|
|
};
|
|
|
|
memset(&req.rtm, 0, sizeof(req.rtm));
|
|
|
|
if (type == RTN_UNICAST)
|
|
tb = dn_fib_get_table(RT_MIN_TABLE, 1);
|
|
else
|
|
tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
|
|
|
|
if (tb == NULL)
|
|
return;
|
|
|
|
req.nlh.nlmsg_len = sizeof(req);
|
|
req.nlh.nlmsg_type = cmd;
|
|
req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
|
|
req.nlh.nlmsg_pid = 0;
|
|
req.nlh.nlmsg_seq = 0;
|
|
|
|
req.rtm.rtm_dst_len = dst_len;
|
|
req.rtm.rtm_table = tb->n;
|
|
req.rtm.rtm_protocol = RTPROT_KERNEL;
|
|
req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
|
|
req.rtm.rtm_type = type;
|
|
|
|
if (cmd == RTM_NEWROUTE)
|
|
tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
|
|
else
|
|
tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL);
|
|
}
|
|
|
|
static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
|
|
{
|
|
|
|
fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
|
|
|
|
#if 0
|
|
if (!(dev->flags&IFF_UP))
|
|
return;
|
|
/* In the future, we will want to add default routes here */
|
|
|
|
#endif
|
|
}
|
|
|
|
static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
|
|
{
|
|
int found_it = 0;
|
|
struct net_device *dev;
|
|
struct dn_dev *dn_db;
|
|
struct dn_ifaddr *ifa2;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/* Scan device list */
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(&init_net, dev) {
|
|
dn_db = rcu_dereference(dev->dn_ptr);
|
|
if (dn_db == NULL)
|
|
continue;
|
|
for (ifa2 = rcu_dereference(dn_db->ifa_list);
|
|
ifa2 != NULL;
|
|
ifa2 = rcu_dereference(ifa2->ifa_next)) {
|
|
if (ifa2->ifa_local == ifa->ifa_local) {
|
|
found_it = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (found_it == 0) {
|
|
fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
|
|
|
|
if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
|
|
if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
|
|
dn_fib_flush();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void dn_fib_disable_addr(struct net_device *dev, int force)
|
|
{
|
|
if (dn_fib_sync_down(0, dev, force))
|
|
dn_fib_flush();
|
|
dn_rt_cache_flush(0);
|
|
neigh_ifdown(&dn_neigh_table, dev);
|
|
}
|
|
|
|
static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
|
|
|
|
switch (event) {
|
|
case NETDEV_UP:
|
|
dn_fib_add_ifaddr(ifa);
|
|
dn_fib_sync_up(ifa->ifa_dev->dev);
|
|
dn_rt_cache_flush(-1);
|
|
break;
|
|
case NETDEV_DOWN:
|
|
dn_fib_del_ifaddr(ifa);
|
|
if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
|
|
dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
|
|
} else {
|
|
dn_rt_cache_flush(-1);
|
|
}
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
|
|
{
|
|
int ret = 0;
|
|
int scope = RT_SCOPE_NOWHERE;
|
|
|
|
if (force)
|
|
scope = -1;
|
|
|
|
for_fib_info() {
|
|
/*
|
|
* This makes no sense for DECnet.... we will almost
|
|
* certainly have more than one local address the same
|
|
* over all our interfaces. It needs thinking about
|
|
* some more.
|
|
*/
|
|
if (local && fi->fib_prefsrc == local) {
|
|
fi->fib_flags |= RTNH_F_DEAD;
|
|
ret++;
|
|
} else if (dev && fi->fib_nhs) {
|
|
int dead = 0;
|
|
|
|
change_nexthops(fi) {
|
|
if (nh->nh_flags&RTNH_F_DEAD)
|
|
dead++;
|
|
else if (nh->nh_dev == dev &&
|
|
nh->nh_scope != scope) {
|
|
spin_lock_bh(&dn_fib_multipath_lock);
|
|
nh->nh_flags |= RTNH_F_DEAD;
|
|
fi->fib_power -= nh->nh_power;
|
|
nh->nh_power = 0;
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
dead++;
|
|
}
|
|
} endfor_nexthops(fi)
|
|
if (dead == fi->fib_nhs) {
|
|
fi->fib_flags |= RTNH_F_DEAD;
|
|
ret++;
|
|
}
|
|
}
|
|
} endfor_fib_info();
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int dn_fib_sync_up(struct net_device *dev)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!(dev->flags&IFF_UP))
|
|
return 0;
|
|
|
|
for_fib_info() {
|
|
int alive = 0;
|
|
|
|
change_nexthops(fi) {
|
|
if (!(nh->nh_flags&RTNH_F_DEAD)) {
|
|
alive++;
|
|
continue;
|
|
}
|
|
if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
|
|
continue;
|
|
if (nh->nh_dev != dev || dev->dn_ptr == NULL)
|
|
continue;
|
|
alive++;
|
|
spin_lock_bh(&dn_fib_multipath_lock);
|
|
nh->nh_power = 0;
|
|
nh->nh_flags &= ~RTNH_F_DEAD;
|
|
spin_unlock_bh(&dn_fib_multipath_lock);
|
|
} endfor_nexthops(fi);
|
|
|
|
if (alive > 0) {
|
|
fi->fib_flags &= ~RTNH_F_DEAD;
|
|
ret++;
|
|
}
|
|
} endfor_fib_info();
|
|
return ret;
|
|
}
|
|
|
|
static struct notifier_block dn_fib_dnaddr_notifier = {
|
|
.notifier_call = dn_fib_dnaddr_event,
|
|
};
|
|
|
|
void __exit dn_fib_cleanup(void)
|
|
{
|
|
dn_fib_table_cleanup();
|
|
dn_fib_rules_cleanup();
|
|
|
|
unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
|
|
}
|
|
|
|
|
|
void __init dn_fib_init(void)
|
|
{
|
|
dn_fib_table_init();
|
|
dn_fib_rules_init();
|
|
|
|
register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
|
|
|
|
rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
|
|
rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
|
|
}
|
|
|
|
|