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798 lines
19 KiB
798 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[email protected]> |
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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 <linux/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/rtnh.h> |
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#define RT_MIN_TABLE 1 |
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|
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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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|
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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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|
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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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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 && refcount_dec_and_test(&fi->fib_treeref)) { |
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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(struct_size(fi, fib_nh, nhs), 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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refcount_inc(&ofi->fib_treeref); |
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return ofi; |
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} |
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refcount_set(&fi->fib_treeref, 1); |
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refcount_set(&fi->fib_clntref, 1); |
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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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|
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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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refcount_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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refcount_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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|
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spin_lock_bh(&dn_fib_multipath_lock); |
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if (fi->fib_power <= 0) { |
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int power = 0; |
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change_nexthops(fi) { |
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if (!(nh->nh_flags&RTNH_F_DEAD)) { |
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power += nh->nh_weight; |
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nh->nh_power = nh->nh_weight; |
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} |
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} endfor_nexthops(fi); |
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fi->fib_power = power; |
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if (power < 0) { |
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spin_unlock_bh(&dn_fib_multipath_lock); |
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res->nh_sel = 0; |
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return; |
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} |
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} |
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|
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w = jiffies % fi->fib_power; |
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|
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change_nexthops(fi) { |
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if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { |
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if ((w -= nh->nh_power) <= 0) { |
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nh->nh_power--; |
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fi->fib_power--; |
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res->nh_sel = nhsel; |
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spin_unlock_bh(&dn_fib_multipath_lock); |
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return; |
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} |
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} |
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} endfor_nexthops(fi); |
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res->nh_sel = 0; |
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spin_unlock_bh(&dn_fib_multipath_lock); |
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} |
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|
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static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table) |
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{ |
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if (attrs[RTA_TABLE]) |
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table = nla_get_u32(attrs[RTA_TABLE]); |
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|
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return table; |
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} |
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|
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static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
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struct netlink_ext_ack *extack) |
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{ |
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struct net *net = sock_net(skb->sk); |
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struct dn_fib_table *tb; |
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struct rtmsg *r = nlmsg_data(nlh); |
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struct nlattr *attrs[RTA_MAX+1]; |
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int err; |
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|
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if (!netlink_capable(skb, CAP_NET_ADMIN)) |
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return -EPERM; |
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|
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if (!net_eq(net, &init_net)) |
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return -EINVAL; |
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|
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err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX, |
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rtm_dn_policy, extack); |
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if (err < 0) |
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return err; |
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|
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tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0); |
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if (!tb) |
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return -ESRCH; |
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|
|
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_deprecated(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); |
|
}
|
|
|