--- /dev/null
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Routing Forwarding Information Base (Glue/Info List)
+ *
+ * Author: Steve Whitehouse <SteveW@ACM.org>
+ *
+ *
+ * Changes:
+ * Alexey Kuznetsov : SMP locking changes
+ * Steve Whitehouse : Rewrote it... Well to be more correct, I
+ * copied most of it from the ipv4 fib code.
+ * Steve Whitehouse : Updated it in style and fixed a few bugs
+ * which were fixed in the ipv4 code since
+ * this code was copied from it.
+ *
+ */
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/socket.h>
+#include <linux/slab.h>
+#include <linux/sockios.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/netdevice.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+#include <asm/uaccess.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/fib_rules.h>
+#include <net/dn.h>
+#include <net/dn_route.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+#include <net/dn_dev.h>
+
+#define RT_MIN_TABLE 1
+
+#define for_fib_info() { struct dn_fib_info *fi;\
+ for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
+#define endfor_fib_info() }
+
+#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
+ for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
+
+#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
+ for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
+
+#define endfor_nexthops(fi) }
+
+static DEFINE_SPINLOCK(dn_fib_multipath_lock);
+static struct dn_fib_info *dn_fib_info_list;
+static DEFINE_SPINLOCK(dn_fib_info_lock);
+
+static struct
+{
+ int error;
+ u8 scope;
+} dn_fib_props[RTN_MAX+1] = {
+ [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
+ [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
+ [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+ [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+ [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+ [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
+ [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+};
+
+static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
+static int dn_fib_sync_up(struct net_device *dev);
+
+void dn_fib_free_info(struct dn_fib_info *fi)
+{
+ if (fi->fib_dead == 0) {
+ printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
+ return;
+ }
+
+ change_nexthops(fi) {
+ if (nh->nh_dev)
+ dev_put(nh->nh_dev);
+ nh->nh_dev = NULL;
+ } endfor_nexthops(fi);
+ kfree(fi);
+}
+
+void dn_fib_release_info(struct dn_fib_info *fi)
+{
+ spin_lock(&dn_fib_info_lock);
+ if (fi && --fi->fib_treeref == 0) {
+ if (fi->fib_next)
+ fi->fib_next->fib_prev = fi->fib_prev;
+ if (fi->fib_prev)
+ fi->fib_prev->fib_next = fi->fib_next;
+ if (fi == dn_fib_info_list)
+ dn_fib_info_list = fi->fib_next;
+ fi->fib_dead = 1;
+ dn_fib_info_put(fi);
+ }
+ spin_unlock(&dn_fib_info_lock);
+}
+
+static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
+{
+ const struct dn_fib_nh *onh = ofi->fib_nh;
+
+ for_nexthops(fi) {
+ if (nh->nh_oif != onh->nh_oif ||
+ nh->nh_gw != onh->nh_gw ||
+ nh->nh_scope != onh->nh_scope ||
+ nh->nh_weight != onh->nh_weight ||
+ ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
+ return -1;
+ onh++;
+ } endfor_nexthops(fi);
+ return 0;
+}
+
+static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
+{
+ for_fib_info() {
+ if (fi->fib_nhs != nfi->fib_nhs)
+ continue;
+ if (nfi->fib_protocol == fi->fib_protocol &&
+ nfi->fib_prefsrc == fi->fib_prefsrc &&
+ nfi->fib_priority == fi->fib_priority &&
+ memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
+ ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
+ (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
+ return fi;
+ } endfor_fib_info();
+ return NULL;
+}
+
+static int dn_fib_count_nhs(const struct nlattr *attr)
+{
+ struct rtnexthop *nhp = nla_data(attr);
+ int nhs = 0, nhlen = nla_len(attr);
+
+ while(nhlen >= (int)sizeof(struct rtnexthop)) {
+ if ((nhlen -= nhp->rtnh_len) < 0)
+ return 0;
+ nhs++;
+ nhp = RTNH_NEXT(nhp);
+ }
+
+ return nhs;
+}
+
+static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr,
+ const struct rtmsg *r)
+{
+ struct rtnexthop *nhp = nla_data(attr);
+ int nhlen = nla_len(attr);
+
+ change_nexthops(fi) {
+ int attrlen = nhlen - sizeof(struct rtnexthop);
+ if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
+ return -EINVAL;
+
+ nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
+ nh->nh_oif = nhp->rtnh_ifindex;
+ nh->nh_weight = nhp->rtnh_hops + 1;
+
+ if (attrlen) {
+ struct nlattr *gw_attr;
+
+ gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
+ nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
+ }
+ nhp = RTNH_NEXT(nhp);
+ } endfor_nexthops(fi);
+
+ return 0;
+}
+
+
+static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
+{
+ int err;
+
+ if (nh->nh_gw) {
+ struct flowidn fld;
+ struct dn_fib_res res;
+
+ if (nh->nh_flags&RTNH_F_ONLINK) {
+ struct net_device *dev;
+
+ if (r->rtm_scope >= RT_SCOPE_LINK)
+ return -EINVAL;
+ if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
+ return -EINVAL;
+ if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
+ return -ENODEV;
+ if (!(dev->flags&IFF_UP))
+ return -ENETDOWN;
+ nh->nh_dev = dev;
+ dev_hold(dev);
+ nh->nh_scope = RT_SCOPE_LINK;
+ return 0;
+ }
+
+ memset(&fld, 0, sizeof(fld));
+ fld.daddr = nh->nh_gw;
+ fld.flowidn_oif = nh->nh_oif;
+ fld.flowidn_scope = r->rtm_scope + 1;
+
+ if (fld.flowidn_scope < RT_SCOPE_LINK)
+ fld.flowidn_scope = RT_SCOPE_LINK;
+
+ if ((err = dn_fib_lookup(&fld, &res)) != 0)
+ return err;
+
+ err = -EINVAL;
+ if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
+ goto out;
+ nh->nh_scope = res.scope;
+ nh->nh_oif = DN_FIB_RES_OIF(res);
+ nh->nh_dev = DN_FIB_RES_DEV(res);
+ if (nh->nh_dev == NULL)
+ goto out;
+ dev_hold(nh->nh_dev);
+ err = -ENETDOWN;
+ if (!(nh->nh_dev->flags & IFF_UP))
+ goto out;
+ err = 0;
+out:
+ dn_fib_res_put(&res);
+ return err;
+ } else {
+ struct net_device *dev;
+
+ if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
+ return -EINVAL;
+
+ dev = __dev_get_by_index(&init_net, nh->nh_oif);
+ if (dev == NULL || dev->dn_ptr == NULL)
+ return -ENODEV;
+ if (!(dev->flags&IFF_UP))
+ return -ENETDOWN;
+ nh->nh_dev = dev;
+ dev_hold(nh->nh_dev);
+ nh->nh_scope = RT_SCOPE_HOST;
+ }
+
+ return 0;
+}
+
+
+struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
+ const struct nlmsghdr *nlh, int *errp)
+{
+ int err;
+ struct dn_fib_info *fi = NULL;
+ struct dn_fib_info *ofi;
+ int nhs = 1;
+
+ if (r->rtm_type > RTN_MAX)
+ goto err_inval;
+
+ if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
+ goto err_inval;
+
+ if (attrs[RTA_MULTIPATH] &&
+ (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
+ goto err_inval;
+
+ fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
+ err = -ENOBUFS;
+ if (fi == NULL)
+ goto failure;
+
+ fi->fib_protocol = r->rtm_protocol;
+ fi->fib_nhs = nhs;
+ fi->fib_flags = r->rtm_flags;
+
+ if (attrs[RTA_PRIORITY])
+ fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
+
+ if (attrs[RTA_METRICS]) {
+ struct nlattr *attr;
+ int rem;
+
+ nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
+ int type = nla_type(attr);
+
+ if (type) {
+ if (type > RTAX_MAX || type == RTAX_CC_ALGO ||
+ nla_len(attr) < 4)
+ goto err_inval;
+
+ fi->fib_metrics[type-1] = nla_get_u32(attr);
+ }
+ }
+ }
+
+ if (attrs[RTA_PREFSRC])
+ fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
+
+ if (attrs[RTA_MULTIPATH]) {
+ if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
+ goto failure;
+
+ if (attrs[RTA_OIF] &&
+ fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
+ goto err_inval;
+
+ if (attrs[RTA_GATEWAY] &&
+ fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
+ goto err_inval;
+ } else {
+ struct dn_fib_nh *nh = fi->fib_nh;
+
+ if (attrs[RTA_OIF])
+ nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
+
+ if (attrs[RTA_GATEWAY])
+ nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
+
+ nh->nh_flags = r->rtm_flags;
+ nh->nh_weight = 1;
+ }
+
+ if (r->rtm_type == RTN_NAT) {
+ if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
+ goto err_inval;
+
+ fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
+ goto link_it;
+ }
+
+ if (dn_fib_props[r->rtm_type].error) {
+ if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
+ goto err_inval;
+
+ goto link_it;
+ }
+
+ if (r->rtm_scope > RT_SCOPE_HOST)
+ goto err_inval;
+
+ if (r->rtm_scope == RT_SCOPE_HOST) {
+ struct dn_fib_nh *nh = fi->fib_nh;
+
+ /* Local address is added */
+ if (nhs != 1 || nh->nh_gw)
+ goto err_inval;
+ nh->nh_scope = RT_SCOPE_NOWHERE;
+ nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
+ err = -ENODEV;
+ if (nh->nh_dev == NULL)
+ goto failure;
+ } else {
+ change_nexthops(fi) {
+ if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
+ goto failure;
+ } endfor_nexthops(fi)
+ }
+
+ if (fi->fib_prefsrc) {
+ if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
+ fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
+ if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
+ goto err_inval;
+ }
+
+link_it:
+ if ((ofi = dn_fib_find_info(fi)) != NULL) {
+ fi->fib_dead = 1;
+ dn_fib_free_info(fi);
+ ofi->fib_treeref++;
+ return ofi;
+ }
+
+ fi->fib_treeref++;
+ atomic_inc(&fi->fib_clntref);
+ spin_lock(&dn_fib_info_lock);
+ fi->fib_next = dn_fib_info_list;
+ fi->fib_prev = NULL;
+ if (dn_fib_info_list)
+ dn_fib_info_list->fib_prev = fi;
+ dn_fib_info_list = fi;
+ spin_unlock(&dn_fib_info_lock);
+ return fi;
+
+err_inval:
+ err = -EINVAL;
+
+failure:
+ *errp = err;
+ if (fi) {
+ fi->fib_dead = 1;
+ dn_fib_free_info(fi);
+ }
+
+ return NULL;
+}
+
+int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
+{
+ int err = dn_fib_props[type].error;
+
+ if (err == 0) {
+ if (fi->fib_flags & RTNH_F_DEAD)
+ return 1;
+
+ res->fi = fi;
+
+ switch (type) {
+ case RTN_NAT:
+ DN_FIB_RES_RESET(*res);
+ atomic_inc(&fi->fib_clntref);
+ return 0;
+ case RTN_UNICAST:
+ case RTN_LOCAL:
+ for_nexthops(fi) {
+ if (nh->nh_flags & RTNH_F_DEAD)
+ continue;
+ if (!fld->flowidn_oif ||
+ fld->flowidn_oif == nh->nh_oif)
+ break;
+ }
+ if (nhsel < fi->fib_nhs) {
+ res->nh_sel = nhsel;
+ atomic_inc(&fi->fib_clntref);
+ return 0;
+ }
+ endfor_nexthops(fi);
+ res->fi = NULL;
+ return 1;
+ default:
+ net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
+ type);
+ res->fi = NULL;
+ return -EINVAL;
+ }
+ }
+ return err;
+}
+
+void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
+{
+ struct dn_fib_info *fi = res->fi;
+ int w;
+
+ 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);
+}
+
+
Code Review / kvmfornfv.git / blobdiff