| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * 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 <linux/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> |
| #include <net/nexthop.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 (rtnh_ok(nhp, nhlen)) { |
| nhs++; |
| nhp = rtnh_next(nhp, &nhlen); |
| } |
| |
| /* leftover implies invalid nexthop configuration, discard it */ |
| return nhlen > 0 ? 0 : 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; |
| |
| if (!rtnh_ok(nhp, nhlen)) |
| 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; |
| |
| attrlen = rtnh_attrlen(nhp); |
| if (attrlen > 0) { |
| 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, &nhlen); |
| } 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(struct_size(fi, fib_nh, nhs), 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++; |
| refcount_set(&fi->fib_clntref, 1); |
| 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); |
| refcount_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; |
| refcount_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 netlink_ext_ack *extack) |
| { |
| 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, |
| extack); |
| 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 netlink_ext_ack *extack) |
| { |
| 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, |
| extack); |
| 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_module(THIS_MODULE, PF_DECnet, RTM_NEWROUTE, |
| dn_fib_rtm_newroute, NULL, 0); |
| rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELROUTE, |
| dn_fib_rtm_delroute, NULL, 0); |
| } |