diff options
Diffstat (limited to 'net/decnet/dn_fib.c')
| -rw-r--r-- | net/decnet/dn_fib.c | 802 |
1 files changed, 802 insertions, 0 deletions
diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c new file mode 100644 index 00000000000..9934b25720e --- /dev/null +++ b/net/decnet/dn_fib.c @@ -0,0 +1,802 @@ +/* + * 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/config.h> +#include <linux/string.h> +#include <linux/net.h> +#include <linux/socket.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 <asm/atomic.h> +#include <asm/uaccess.h> +#include <net/neighbour.h> +#include <net/dst.h> +#include <net/flow.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) } + +extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb); + +static DEFINE_SPINLOCK(dn_fib_multipath_lock); +static struct dn_fib_info *dn_fib_info_list; +static DEFINE_RWLOCK(dn_fib_info_lock); + +static struct +{ + int error; + u8 scope; +} dn_fib_props[RTA_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 }, +}; + +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) +{ + write_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); + } + write_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; +} + +u16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type) +{ + while(RTA_OK(attr,attrlen)) { + if (attr->rta_type == type) + return *(u16*)RTA_DATA(attr); + attr = RTA_NEXT(attr, attrlen); + } + + return 0; +} + +static int dn_fib_count_nhs(struct rtattr *rta) +{ + int nhs = 0; + struct rtnexthop *nhp = RTA_DATA(rta); + int nhlen = RTA_PAYLOAD(rta); + + 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 rtattr *rta, const struct rtmsg *r) +{ + struct rtnexthop *nhp = RTA_DATA(rta); + int nhlen = RTA_PAYLOAD(rta); + + 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) { + nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY); + } + 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 flowi fl; + struct dn_fib_res res; + + memset(&fl, 0, sizeof(fl)); + + 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(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(&fl, 0, sizeof(fl)); + fl.fld_dst = nh->nh_gw; + fl.oif = nh->nh_oif; + fl.fld_scope = r->rtm_scope + 1; + + if (fl.fld_scope < RT_SCOPE_LINK) + fl.fld_scope = RT_SCOPE_LINK; + + if ((err = dn_fib_lookup(&fl, &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(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 dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp) +{ + int err; + struct dn_fib_info *fi = NULL; + struct dn_fib_info *ofi; + int nhs = 1; + + if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) + goto err_inval; + + if (rta->rta_mp) { + nhs = dn_fib_count_nhs(rta->rta_mp); + if (nhs == 0) + goto err_inval; + } + + fi = kmalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL); + err = -ENOBUFS; + if (fi == NULL) + goto failure; + memset(fi, 0, sizeof(*fi)+nhs*sizeof(struct dn_fib_nh)); + + fi->fib_protocol = r->rtm_protocol; + fi->fib_nhs = nhs; + fi->fib_flags = r->rtm_flags; + if (rta->rta_priority) + fi->fib_priority = *rta->rta_priority; + if (rta->rta_mx) { + int attrlen = RTA_PAYLOAD(rta->rta_mx); + struct rtattr *attr = RTA_DATA(rta->rta_mx); + + while(RTA_OK(attr, attrlen)) { + unsigned flavour = attr->rta_type; + if (flavour) { + if (flavour > RTAX_MAX) + goto err_inval; + fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr); + } + attr = RTA_NEXT(attr, attrlen); + } + } + if (rta->rta_prefsrc) + memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2); + + if (rta->rta_mp) { + if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0) + goto failure; + if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif) + goto err_inval; + if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2)) + goto err_inval; + } else { + struct dn_fib_nh *nh = fi->fib_nh; + if (rta->rta_oif) + nh->nh_oif = *rta->rta_oif; + if (rta->rta_gw) + memcpy(&nh->nh_gw, rta->rta_gw, 2); + nh->nh_flags = r->rtm_flags; + nh->nh_weight = 1; + } + + if (r->rtm_type == RTN_NAT) { + if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif) + goto err_inval; + memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2); + goto link_it; + } + + if (dn_fib_props[r->rtm_type].error) { + if (rta->rta_gw || rta->rta_oif || rta->rta_mp) + 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(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 || rta->rta_dst == NULL || + memcmp(&fi->fib_prefsrc, rta->rta_dst, 2)) + 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); + write_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; + write_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 flowi *fl, 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 (!fl->oif || fl->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: + if (net_ratelimit()) + printk("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 flowi *fl, 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 int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta) +{ + int i; + + for(i = 1; i <= RTA_MAX; i++) { + struct rtattr *attr = rta[i-1]; + if (attr) { + if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2) + return -EINVAL; + if (i != RTA_MULTIPATH && i != RTA_METRICS) + rta[i-1] = (struct rtattr *)RTA_DATA(attr); + } + } + + return 0; +} + +int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) +{ + struct dn_fib_table *tb; + struct rtattr **rta = arg; + struct rtmsg *r = NLMSG_DATA(nlh); + + if (dn_fib_check_attr(r, rta)) + return -EINVAL; + + tb = dn_fib_get_table(r->rtm_table, 0); + if (tb) + return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); + + return -ESRCH; +} + +int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) +{ + struct dn_fib_table *tb; + struct rtattr **rta = arg; + struct rtmsg *r = NLMSG_DATA(nlh); + + if (dn_fib_check_attr(r, rta)) + return -EINVAL; + + tb = dn_fib_get_table(r->rtm_table, 1); + if (tb) + return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); + + return -ENOBUFS; +} + + +int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) +{ + int t; + int s_t; + struct dn_fib_table *tb; + + if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) && + ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED) + return dn_cache_dump(skb, cb); + + s_t = cb->args[0]; + if (s_t == 0) + s_t = cb->args[0] = RT_MIN_TABLE; + + for(t = s_t; t <= RT_TABLE_MAX; t++) { + if (t < s_t) + continue; + if (t > s_t) + memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(int)); + tb = dn_fib_get_table(t, 0); + if (tb == NULL) + continue; + if (tb->dump(tb, skb, cb) < 0) + break; + } + + cb->args[0] = t; + + return skb->len; +} + +static void fib_magic(int cmd, int type, __u16 dst, int dst_len, struct dn_ifaddr *ifa) +{ + struct dn_fib_table *tb; + struct { + struct nlmsghdr nlh; + struct rtmsg rtm; + } req; + struct dn_kern_rta rta; + + memset(&req.rtm, 0, sizeof(req.rtm)); + memset(&rta, 0, sizeof(rta)); + + 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; + + rta.rta_dst = &dst; + rta.rta_prefsrc = &ifa->ifa_local; + rta.rta_oif = &ifa->ifa_dev->dev->ifindex; + + if (cmd == RTM_NEWROUTE) + tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL); + else + tb->delete(tb, &req.rtm, &rta, &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 */ + read_lock(&dev_base_lock); + for(dev = dev_base; dev; dev = dev->next) { + dn_db = dev->dn_ptr; + if (dn_db == NULL) + continue; + for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) { + if (ifa2->ifa_local == ifa->ifa_local) { + found_it = 1; + break; + } + } + } + read_unlock(&dev_base_lock); + + 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; +} + +int dn_fib_sync_down(dn_address 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; +} + + +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; +} + +void dn_fib_flush(void) +{ + int flushed = 0; + struct dn_fib_table *tb; + int id; + + for(id = RT_TABLE_MAX; id > 0; id--) { + if ((tb = dn_fib_get_table(id, 0)) == NULL) + continue; + flushed += tb->flush(tb); + } + + if (flushed) + dn_rt_cache_flush(-1); +} + +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); +} + + |