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fca09fb732
Same alignment requirement was removed on IP route cache in the past. This alignment actually has bad effect on 32 bit arches, uniprocessor, since sizeof(dn_rt_hash_bucket) is forced to 8 bytes instead of 4. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1812 lines
44 KiB
C
1812 lines
44 KiB
C
/*
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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* operating system. DECnet is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* DECnet Routing Functions (Endnode and Router)
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*
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* Authors: Steve Whitehouse <SteveW@ACM.org>
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* Eduardo Marcelo Serrat <emserrat@geocities.com>
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*
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* Changes:
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* Steve Whitehouse : Fixes to allow "intra-ethernet" and
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* "return-to-sender" bits on outgoing
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* packets.
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* Steve Whitehouse : Timeouts for cached routes.
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* Steve Whitehouse : Use dst cache for input routes too.
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* Steve Whitehouse : Fixed error values in dn_send_skb.
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* Steve Whitehouse : Rework routing functions to better fit
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* DECnet routing design
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* Alexey Kuznetsov : New SMP locking
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* Steve Whitehouse : More SMP locking changes & dn_cache_dump()
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* Steve Whitehouse : Prerouting NF hook, now really is prerouting.
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* Fixed possible skb leak in rtnetlink funcs.
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* Steve Whitehouse : Dave Miller's dynamic hash table sizing and
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* Alexey Kuznetsov's finer grained locking
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* from ipv4/route.c.
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* Steve Whitehouse : Routing is now starting to look like a
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* sensible set of code now, mainly due to
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* my copying the IPv4 routing code. The
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* hooks here are modified and will continue
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* to evolve for a while.
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* Steve Whitehouse : Real SMP at last :-) Also new netfilter
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* stuff. Look out raw sockets your days
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* are numbered!
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* Steve Whitehouse : Added return-to-sender functions. Added
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* backlog congestion level return codes.
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* Steve Whitehouse : Fixed bug where routes were set up with
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* no ref count on net devices.
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* Steve Whitehouse : RCU for the route cache
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* Steve Whitehouse : Preparations for the flow cache
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* Steve Whitehouse : Prepare for nonlinear skbs
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*/
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/******************************************************************************
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(c) 1995-1998 E.M. Serrat emserrat@geocities.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*******************************************************************************/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/inet.h>
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#include <linux/route.h>
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#include <linux/in_route.h>
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#include <net/sock.h>
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#include <linux/mm.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/rtnetlink.h>
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#include <linux/string.h>
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#include <linux/netfilter_decnet.h>
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#include <linux/rcupdate.h>
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#include <linux/times.h>
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#include <asm/errno.h>
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#include <net/net_namespace.h>
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#include <net/netlink.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_dev.h>
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#include <net/dn_nsp.h>
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#include <net/dn_route.h>
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#include <net/dn_neigh.h>
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#include <net/dn_fib.h>
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struct dn_rt_hash_bucket
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{
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struct dn_route *chain;
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spinlock_t lock;
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};
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extern struct neigh_table dn_neigh_table;
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static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
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static const int dn_rt_min_delay = 2 * HZ;
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static const int dn_rt_max_delay = 10 * HZ;
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static const int dn_rt_mtu_expires = 10 * 60 * HZ;
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static unsigned long dn_rt_deadline;
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static int dn_dst_gc(struct dst_ops *ops);
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static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
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static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
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static void dn_dst_link_failure(struct sk_buff *);
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static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
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static int dn_route_input(struct sk_buff *);
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static void dn_run_flush(unsigned long dummy);
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static struct dn_rt_hash_bucket *dn_rt_hash_table;
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static unsigned dn_rt_hash_mask;
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static struct timer_list dn_route_timer;
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static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0);
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int decnet_dst_gc_interval = 2;
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static struct dst_ops dn_dst_ops = {
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.family = PF_DECnet,
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.protocol = __constant_htons(ETH_P_DNA_RT),
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.gc_thresh = 128,
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.gc = dn_dst_gc,
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.check = dn_dst_check,
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.negative_advice = dn_dst_negative_advice,
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.link_failure = dn_dst_link_failure,
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.update_pmtu = dn_dst_update_pmtu,
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.entry_size = sizeof(struct dn_route),
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.entries = ATOMIC_INIT(0),
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};
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static __inline__ unsigned dn_hash(__le16 src, __le16 dst)
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{
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__u16 tmp = (__u16 __force)(src ^ dst);
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tmp ^= (tmp >> 3);
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tmp ^= (tmp >> 5);
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tmp ^= (tmp >> 10);
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return dn_rt_hash_mask & (unsigned)tmp;
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}
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static inline void dnrt_free(struct dn_route *rt)
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{
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call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
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}
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static inline void dnrt_drop(struct dn_route *rt)
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{
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dst_release(&rt->u.dst);
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call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
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}
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static void dn_dst_check_expire(unsigned long dummy)
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{
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int i;
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struct dn_route *rt, **rtp;
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unsigned long now = jiffies;
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unsigned long expire = 120 * HZ;
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for(i = 0; i <= dn_rt_hash_mask; i++) {
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rtp = &dn_rt_hash_table[i].chain;
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spin_lock(&dn_rt_hash_table[i].lock);
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while((rt=*rtp) != NULL) {
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if (atomic_read(&rt->u.dst.__refcnt) ||
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(now - rt->u.dst.lastuse) < expire) {
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rtp = &rt->u.dst.dn_next;
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continue;
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}
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*rtp = rt->u.dst.dn_next;
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rt->u.dst.dn_next = NULL;
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dnrt_free(rt);
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}
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spin_unlock(&dn_rt_hash_table[i].lock);
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if ((jiffies - now) > 0)
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break;
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}
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mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
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}
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static int dn_dst_gc(struct dst_ops *ops)
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{
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struct dn_route *rt, **rtp;
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int i;
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unsigned long now = jiffies;
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unsigned long expire = 10 * HZ;
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for(i = 0; i <= dn_rt_hash_mask; i++) {
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spin_lock_bh(&dn_rt_hash_table[i].lock);
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rtp = &dn_rt_hash_table[i].chain;
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while((rt=*rtp) != NULL) {
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if (atomic_read(&rt->u.dst.__refcnt) ||
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(now - rt->u.dst.lastuse) < expire) {
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rtp = &rt->u.dst.dn_next;
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continue;
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}
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*rtp = rt->u.dst.dn_next;
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rt->u.dst.dn_next = NULL;
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dnrt_drop(rt);
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break;
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}
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spin_unlock_bh(&dn_rt_hash_table[i].lock);
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}
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return 0;
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}
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/*
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* The decnet standards don't impose a particular minimum mtu, what they
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* do insist on is that the routing layer accepts a datagram of at least
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* 230 bytes long. Here we have to subtract the routing header length from
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* 230 to get the minimum acceptable mtu. If there is no neighbour, then we
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* assume the worst and use a long header size.
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*
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* We update both the mtu and the advertised mss (i.e. the segment size we
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* advertise to the other end).
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*/
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static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
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{
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u32 min_mtu = 230;
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struct dn_dev *dn = dst->neighbour ?
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(struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL;
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if (dn && dn->use_long == 0)
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min_mtu -= 6;
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else
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min_mtu -= 21;
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if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) {
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if (!(dst_metric_locked(dst, RTAX_MTU))) {
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dst->metrics[RTAX_MTU-1] = mtu;
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dst_set_expires(dst, dn_rt_mtu_expires);
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}
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if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
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u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
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if (dst->metrics[RTAX_ADVMSS-1] > mss)
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dst->metrics[RTAX_ADVMSS-1] = mss;
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}
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}
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}
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/*
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* When a route has been marked obsolete. (e.g. routing cache flush)
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*/
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static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
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{
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return NULL;
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}
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static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
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{
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dst_release(dst);
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return NULL;
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}
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static void dn_dst_link_failure(struct sk_buff *skb)
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{
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return;
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}
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static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
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{
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return ((fl1->nl_u.dn_u.daddr ^ fl2->nl_u.dn_u.daddr) |
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(fl1->nl_u.dn_u.saddr ^ fl2->nl_u.dn_u.saddr) |
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(fl1->mark ^ fl2->mark) |
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(fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) |
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(fl1->oif ^ fl2->oif) |
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(fl1->iif ^ fl2->iif)) == 0;
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}
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static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp)
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{
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struct dn_route *rth, **rthp;
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unsigned long now = jiffies;
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rthp = &dn_rt_hash_table[hash].chain;
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spin_lock_bh(&dn_rt_hash_table[hash].lock);
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while((rth = *rthp) != NULL) {
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if (compare_keys(&rth->fl, &rt->fl)) {
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/* Put it first */
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*rthp = rth->u.dst.dn_next;
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rcu_assign_pointer(rth->u.dst.dn_next,
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dn_rt_hash_table[hash].chain);
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rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
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dst_use(&rth->u.dst, now);
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spin_unlock_bh(&dn_rt_hash_table[hash].lock);
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dnrt_drop(rt);
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*rp = rth;
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return 0;
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}
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rthp = &rth->u.dst.dn_next;
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}
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rcu_assign_pointer(rt->u.dst.dn_next, dn_rt_hash_table[hash].chain);
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rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
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dst_use(&rt->u.dst, now);
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spin_unlock_bh(&dn_rt_hash_table[hash].lock);
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*rp = rt;
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return 0;
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}
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void dn_run_flush(unsigned long dummy)
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{
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int i;
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struct dn_route *rt, *next;
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for(i = 0; i < dn_rt_hash_mask; i++) {
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spin_lock_bh(&dn_rt_hash_table[i].lock);
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if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL)
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goto nothing_to_declare;
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for(; rt; rt=next) {
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next = rt->u.dst.dn_next;
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rt->u.dst.dn_next = NULL;
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dst_free((struct dst_entry *)rt);
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}
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nothing_to_declare:
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spin_unlock_bh(&dn_rt_hash_table[i].lock);
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}
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}
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static DEFINE_SPINLOCK(dn_rt_flush_lock);
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void dn_rt_cache_flush(int delay)
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{
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unsigned long now = jiffies;
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int user_mode = !in_interrupt();
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if (delay < 0)
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delay = dn_rt_min_delay;
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spin_lock_bh(&dn_rt_flush_lock);
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if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
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long tmo = (long)(dn_rt_deadline - now);
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if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
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tmo = 0;
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if (delay > tmo)
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delay = tmo;
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}
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if (delay <= 0) {
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spin_unlock_bh(&dn_rt_flush_lock);
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dn_run_flush(0);
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return;
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}
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if (dn_rt_deadline == 0)
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dn_rt_deadline = now + dn_rt_max_delay;
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dn_rt_flush_timer.expires = now + delay;
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add_timer(&dn_rt_flush_timer);
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spin_unlock_bh(&dn_rt_flush_lock);
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}
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/**
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* dn_return_short - Return a short packet to its sender
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* @skb: The packet to return
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*
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*/
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static int dn_return_short(struct sk_buff *skb)
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{
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struct dn_skb_cb *cb;
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unsigned char *ptr;
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__le16 *src;
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__le16 *dst;
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__le16 tmp;
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/* Add back headers */
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skb_push(skb, skb->data - skb_network_header(skb));
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if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
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return NET_RX_DROP;
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cb = DN_SKB_CB(skb);
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/* Skip packet length and point to flags */
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ptr = skb->data + 2;
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*ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
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dst = (__le16 *)ptr;
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ptr += 2;
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src = (__le16 *)ptr;
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ptr += 2;
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*ptr = 0; /* Zero hop count */
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|
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/* Swap source and destination */
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tmp = *src;
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*src = *dst;
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*dst = tmp;
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skb->pkt_type = PACKET_OUTGOING;
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dn_rt_finish_output(skb, NULL, NULL);
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return NET_RX_SUCCESS;
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}
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|
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/**
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* dn_return_long - Return a long packet to its sender
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* @skb: The long format packet to return
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*
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*/
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static int dn_return_long(struct sk_buff *skb)
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{
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struct dn_skb_cb *cb;
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unsigned char *ptr;
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unsigned char *src_addr, *dst_addr;
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unsigned char tmp[ETH_ALEN];
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|
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/* Add back all headers */
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skb_push(skb, skb->data - skb_network_header(skb));
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if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
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return NET_RX_DROP;
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|
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cb = DN_SKB_CB(skb);
|
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/* Ignore packet length and point to flags */
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ptr = skb->data + 2;
|
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|
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/* Skip padding */
|
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if (*ptr & DN_RT_F_PF) {
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char padlen = (*ptr & ~DN_RT_F_PF);
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ptr += padlen;
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}
|
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|
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*ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
|
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ptr += 2;
|
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dst_addr = ptr;
|
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ptr += 8;
|
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src_addr = ptr;
|
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ptr += 6;
|
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*ptr = 0; /* Zero hop count */
|
|
|
|
/* Swap source and destination */
|
|
memcpy(tmp, src_addr, ETH_ALEN);
|
|
memcpy(src_addr, dst_addr, ETH_ALEN);
|
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memcpy(dst_addr, tmp, ETH_ALEN);
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|
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skb->pkt_type = PACKET_OUTGOING;
|
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dn_rt_finish_output(skb, dst_addr, src_addr);
|
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return NET_RX_SUCCESS;
|
|
}
|
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|
|
/**
|
|
* dn_route_rx_packet - Try and find a route for an incoming packet
|
|
* @skb: The packet to find a route for
|
|
*
|
|
* Returns: result of input function if route is found, error code otherwise
|
|
*/
|
|
static int dn_route_rx_packet(struct sk_buff *skb)
|
|
{
|
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struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
int err;
|
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|
|
if ((err = dn_route_input(skb)) == 0)
|
|
return dst_input(skb);
|
|
|
|
if (decnet_debug_level & 4) {
|
|
char *devname = skb->dev ? skb->dev->name : "???";
|
|
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
printk(KERN_DEBUG
|
|
"DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
|
|
(int)cb->rt_flags, devname, skb->len,
|
|
dn_ntohs(cb->src), dn_ntohs(cb->dst),
|
|
err, skb->pkt_type);
|
|
}
|
|
|
|
if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
|
|
switch(cb->rt_flags & DN_RT_PKT_MSK) {
|
|
case DN_RT_PKT_SHORT:
|
|
return dn_return_short(skb);
|
|
case DN_RT_PKT_LONG:
|
|
return dn_return_long(skb);
|
|
}
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
static int dn_route_rx_long(struct sk_buff *skb)
|
|
{
|
|
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
unsigned char *ptr = skb->data;
|
|
|
|
if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
|
|
goto drop_it;
|
|
|
|
skb_pull(skb, 20);
|
|
skb_reset_transport_header(skb);
|
|
|
|
/* Destination info */
|
|
ptr += 2;
|
|
cb->dst = dn_eth2dn(ptr);
|
|
if (memcmp(ptr, dn_hiord_addr, 4) != 0)
|
|
goto drop_it;
|
|
ptr += 6;
|
|
|
|
|
|
/* Source info */
|
|
ptr += 2;
|
|
cb->src = dn_eth2dn(ptr);
|
|
if (memcmp(ptr, dn_hiord_addr, 4) != 0)
|
|
goto drop_it;
|
|
ptr += 6;
|
|
/* Other junk */
|
|
ptr++;
|
|
cb->hops = *ptr++; /* Visit Count */
|
|
|
|
return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
|
|
|
|
drop_it:
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
|
|
|
|
static int dn_route_rx_short(struct sk_buff *skb)
|
|
{
|
|
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
unsigned char *ptr = skb->data;
|
|
|
|
if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
|
|
goto drop_it;
|
|
|
|
skb_pull(skb, 5);
|
|
skb_reset_transport_header(skb);
|
|
|
|
cb->dst = *(__le16 *)ptr;
|
|
ptr += 2;
|
|
cb->src = *(__le16 *)ptr;
|
|
ptr += 2;
|
|
cb->hops = *ptr & 0x3f;
|
|
|
|
return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
|
|
|
|
drop_it:
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
static int dn_route_discard(struct sk_buff *skb)
|
|
{
|
|
/*
|
|
* I know we drop the packet here, but thats considered success in
|
|
* this case
|
|
*/
|
|
kfree_skb(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
static int dn_route_ptp_hello(struct sk_buff *skb)
|
|
{
|
|
dn_dev_hello(skb);
|
|
dn_neigh_pointopoint_hello(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct dn_skb_cb *cb;
|
|
unsigned char flags = 0;
|
|
__u16 len = dn_ntohs(*(__le16 *)skb->data);
|
|
struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
|
|
unsigned char padlen = 0;
|
|
|
|
if (dev->nd_net != &init_net)
|
|
goto dump_it;
|
|
|
|
if (dn == NULL)
|
|
goto dump_it;
|
|
|
|
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
|
|
goto out;
|
|
|
|
if (!pskb_may_pull(skb, 3))
|
|
goto dump_it;
|
|
|
|
skb_pull(skb, 2);
|
|
|
|
if (len > skb->len)
|
|
goto dump_it;
|
|
|
|
skb_trim(skb, len);
|
|
|
|
flags = *skb->data;
|
|
|
|
cb = DN_SKB_CB(skb);
|
|
cb->stamp = jiffies;
|
|
cb->iif = dev->ifindex;
|
|
|
|
/*
|
|
* If we have padding, remove it.
|
|
*/
|
|
if (flags & DN_RT_F_PF) {
|
|
padlen = flags & ~DN_RT_F_PF;
|
|
if (!pskb_may_pull(skb, padlen + 1))
|
|
goto dump_it;
|
|
skb_pull(skb, padlen);
|
|
flags = *skb->data;
|
|
}
|
|
|
|
skb_reset_network_header(skb);
|
|
|
|
/*
|
|
* Weed out future version DECnet
|
|
*/
|
|
if (flags & DN_RT_F_VER)
|
|
goto dump_it;
|
|
|
|
cb->rt_flags = flags;
|
|
|
|
if (decnet_debug_level & 1)
|
|
printk(KERN_DEBUG
|
|
"dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
|
|
(int)flags, (dev) ? dev->name : "???", len, skb->len,
|
|
padlen);
|
|
|
|
if (flags & DN_RT_PKT_CNTL) {
|
|
if (unlikely(skb_linearize(skb)))
|
|
goto dump_it;
|
|
|
|
switch(flags & DN_RT_CNTL_MSK) {
|
|
case DN_RT_PKT_INIT:
|
|
dn_dev_init_pkt(skb);
|
|
break;
|
|
case DN_RT_PKT_VERI:
|
|
dn_dev_veri_pkt(skb);
|
|
break;
|
|
}
|
|
|
|
if (dn->parms.state != DN_DEV_S_RU)
|
|
goto dump_it;
|
|
|
|
switch(flags & DN_RT_CNTL_MSK) {
|
|
case DN_RT_PKT_HELO:
|
|
return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello);
|
|
|
|
case DN_RT_PKT_L1RT:
|
|
case DN_RT_PKT_L2RT:
|
|
return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard);
|
|
case DN_RT_PKT_ERTH:
|
|
return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello);
|
|
|
|
case DN_RT_PKT_EEDH:
|
|
return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello);
|
|
}
|
|
} else {
|
|
if (dn->parms.state != DN_DEV_S_RU)
|
|
goto dump_it;
|
|
|
|
skb_pull(skb, 1); /* Pull flags */
|
|
|
|
switch(flags & DN_RT_PKT_MSK) {
|
|
case DN_RT_PKT_LONG:
|
|
return dn_route_rx_long(skb);
|
|
case DN_RT_PKT_SHORT:
|
|
return dn_route_rx_short(skb);
|
|
}
|
|
}
|
|
|
|
dump_it:
|
|
kfree_skb(skb);
|
|
out:
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
static int dn_output(struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb->dst;
|
|
struct dn_route *rt = (struct dn_route *)dst;
|
|
struct net_device *dev = dst->dev;
|
|
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
struct neighbour *neigh;
|
|
|
|
int err = -EINVAL;
|
|
|
|
if ((neigh = dst->neighbour) == NULL)
|
|
goto error;
|
|
|
|
skb->dev = dev;
|
|
|
|
cb->src = rt->rt_saddr;
|
|
cb->dst = rt->rt_daddr;
|
|
|
|
/*
|
|
* Always set the Intra-Ethernet bit on all outgoing packets
|
|
* originated on this node. Only valid flag from upper layers
|
|
* is return-to-sender-requested. Set hop count to 0 too.
|
|
*/
|
|
cb->rt_flags &= ~DN_RT_F_RQR;
|
|
cb->rt_flags |= DN_RT_F_IE;
|
|
cb->hops = 0;
|
|
|
|
return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output);
|
|
|
|
error:
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "dn_output: This should not happen\n");
|
|
|
|
kfree_skb(skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int dn_forward(struct sk_buff *skb)
|
|
{
|
|
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
struct dst_entry *dst = skb->dst;
|
|
struct dn_dev *dn_db = dst->dev->dn_ptr;
|
|
struct dn_route *rt;
|
|
struct neighbour *neigh = dst->neighbour;
|
|
int header_len;
|
|
#ifdef CONFIG_NETFILTER
|
|
struct net_device *dev = skb->dev;
|
|
#endif
|
|
|
|
if (skb->pkt_type != PACKET_HOST)
|
|
goto drop;
|
|
|
|
/* Ensure that we have enough space for headers */
|
|
rt = (struct dn_route *)skb->dst;
|
|
header_len = dn_db->use_long ? 21 : 6;
|
|
if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len))
|
|
goto drop;
|
|
|
|
/*
|
|
* Hop count exceeded.
|
|
*/
|
|
if (++cb->hops > 30)
|
|
goto drop;
|
|
|
|
skb->dev = rt->u.dst.dev;
|
|
|
|
/*
|
|
* If packet goes out same interface it came in on, then set
|
|
* the Intra-Ethernet bit. This has no effect for short
|
|
* packets, so we don't need to test for them here.
|
|
*/
|
|
cb->rt_flags &= ~DN_RT_F_IE;
|
|
if (rt->rt_flags & RTCF_DOREDIRECT)
|
|
cb->rt_flags |= DN_RT_F_IE;
|
|
|
|
return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
/*
|
|
* Used to catch bugs. This should never normally get
|
|
* called.
|
|
*/
|
|
static int dn_rt_bug(struct sk_buff *skb)
|
|
{
|
|
if (net_ratelimit()) {
|
|
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
|
|
printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n",
|
|
dn_ntohs(cb->src), dn_ntohs(cb->dst));
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
|
|
return NET_RX_BAD;
|
|
}
|
|
|
|
static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
|
|
{
|
|
struct dn_fib_info *fi = res->fi;
|
|
struct net_device *dev = rt->u.dst.dev;
|
|
struct neighbour *n;
|
|
unsigned mss;
|
|
|
|
if (fi) {
|
|
if (DN_FIB_RES_GW(*res) &&
|
|
DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
|
|
rt->rt_gateway = DN_FIB_RES_GW(*res);
|
|
memcpy(rt->u.dst.metrics, fi->fib_metrics,
|
|
sizeof(rt->u.dst.metrics));
|
|
}
|
|
rt->rt_type = res->type;
|
|
|
|
if (dev != NULL && rt->u.dst.neighbour == NULL) {
|
|
n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
|
|
if (IS_ERR(n))
|
|
return PTR_ERR(n);
|
|
rt->u.dst.neighbour = n;
|
|
}
|
|
|
|
if (rt->u.dst.metrics[RTAX_MTU-1] == 0 ||
|
|
rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu)
|
|
rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
|
|
mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst));
|
|
if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 ||
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] > mss)
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = mss;
|
|
return 0;
|
|
}
|
|
|
|
static inline int dn_match_addr(__le16 addr1, __le16 addr2)
|
|
{
|
|
__u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2);
|
|
int match = 16;
|
|
while(tmp) {
|
|
tmp >>= 1;
|
|
match--;
|
|
}
|
|
return match;
|
|
}
|
|
|
|
static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
|
|
{
|
|
__le16 saddr = 0;
|
|
struct dn_dev *dn_db = dev->dn_ptr;
|
|
struct dn_ifaddr *ifa;
|
|
int best_match = 0;
|
|
int ret;
|
|
|
|
read_lock(&dev_base_lock);
|
|
for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
|
|
if (ifa->ifa_scope > scope)
|
|
continue;
|
|
if (!daddr) {
|
|
saddr = ifa->ifa_local;
|
|
break;
|
|
}
|
|
ret = dn_match_addr(daddr, ifa->ifa_local);
|
|
if (ret > best_match)
|
|
saddr = ifa->ifa_local;
|
|
if (best_match == 0)
|
|
saddr = ifa->ifa_local;
|
|
}
|
|
read_unlock(&dev_base_lock);
|
|
|
|
return saddr;
|
|
}
|
|
|
|
static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
|
|
{
|
|
return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
|
|
}
|
|
|
|
static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
|
|
{
|
|
__le16 mask = dnet_make_mask(res->prefixlen);
|
|
return (daddr&~mask)|res->fi->fib_nh->nh_gw;
|
|
}
|
|
|
|
static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard)
|
|
{
|
|
struct flowi fl = { .nl_u = { .dn_u =
|
|
{ .daddr = oldflp->fld_dst,
|
|
.saddr = oldflp->fld_src,
|
|
.scope = RT_SCOPE_UNIVERSE,
|
|
} },
|
|
.mark = oldflp->mark,
|
|
.iif = init_net.loopback_dev->ifindex,
|
|
.oif = oldflp->oif };
|
|
struct dn_route *rt = NULL;
|
|
struct net_device *dev_out = NULL, *dev;
|
|
struct neighbour *neigh = NULL;
|
|
unsigned hash;
|
|
unsigned flags = 0;
|
|
struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
|
|
int err;
|
|
int free_res = 0;
|
|
__le16 gateway = 0;
|
|
|
|
if (decnet_debug_level & 16)
|
|
printk(KERN_DEBUG
|
|
"dn_route_output_slow: dst=%04x src=%04x mark=%d"
|
|
" iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),
|
|
dn_ntohs(oldflp->fld_src),
|
|
oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif);
|
|
|
|
/* If we have an output interface, verify its a DECnet device */
|
|
if (oldflp->oif) {
|
|
dev_out = dev_get_by_index(&init_net, oldflp->oif);
|
|
err = -ENODEV;
|
|
if (dev_out && dev_out->dn_ptr == NULL) {
|
|
dev_put(dev_out);
|
|
dev_out = NULL;
|
|
}
|
|
if (dev_out == NULL)
|
|
goto out;
|
|
}
|
|
|
|
/* If we have a source address, verify that its a local address */
|
|
if (oldflp->fld_src) {
|
|
err = -EADDRNOTAVAIL;
|
|
|
|
if (dev_out) {
|
|
if (dn_dev_islocal(dev_out, oldflp->fld_src))
|
|
goto source_ok;
|
|
dev_put(dev_out);
|
|
goto out;
|
|
}
|
|
read_lock(&dev_base_lock);
|
|
for_each_netdev(&init_net, dev) {
|
|
if (!dev->dn_ptr)
|
|
continue;
|
|
if (!dn_dev_islocal(dev, oldflp->fld_src))
|
|
continue;
|
|
if ((dev->flags & IFF_LOOPBACK) &&
|
|
oldflp->fld_dst &&
|
|
!dn_dev_islocal(dev, oldflp->fld_dst))
|
|
continue;
|
|
|
|
dev_out = dev;
|
|
break;
|
|
}
|
|
read_unlock(&dev_base_lock);
|
|
if (dev_out == NULL)
|
|
goto out;
|
|
dev_hold(dev_out);
|
|
source_ok:
|
|
;
|
|
}
|
|
|
|
/* No destination? Assume its local */
|
|
if (!fl.fld_dst) {
|
|
fl.fld_dst = fl.fld_src;
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
dev_out = init_net.loopback_dev;
|
|
dev_hold(dev_out);
|
|
if (!fl.fld_dst) {
|
|
fl.fld_dst =
|
|
fl.fld_src = dnet_select_source(dev_out, 0,
|
|
RT_SCOPE_HOST);
|
|
if (!fl.fld_dst)
|
|
goto out;
|
|
}
|
|
fl.oif = init_net.loopback_dev->ifindex;
|
|
res.type = RTN_LOCAL;
|
|
goto make_route;
|
|
}
|
|
|
|
if (decnet_debug_level & 16)
|
|
printk(KERN_DEBUG
|
|
"dn_route_output_slow: initial checks complete."
|
|
" dst=%o4x src=%04x oif=%d try_hard=%d\n",
|
|
dn_ntohs(fl.fld_dst), dn_ntohs(fl.fld_src),
|
|
fl.oif, try_hard);
|
|
|
|
/*
|
|
* N.B. If the kernel is compiled without router support then
|
|
* dn_fib_lookup() will evaluate to non-zero so this if () block
|
|
* will always be executed.
|
|
*/
|
|
err = -ESRCH;
|
|
if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) {
|
|
struct dn_dev *dn_db;
|
|
if (err != -ESRCH)
|
|
goto out;
|
|
/*
|
|
* Here the fallback is basically the standard algorithm for
|
|
* routing in endnodes which is described in the DECnet routing
|
|
* docs
|
|
*
|
|
* If we are not trying hard, look in neighbour cache.
|
|
* The result is tested to ensure that if a specific output
|
|
* device/source address was requested, then we honour that
|
|
* here
|
|
*/
|
|
if (!try_hard) {
|
|
neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fl.fld_dst);
|
|
if (neigh) {
|
|
if ((oldflp->oif &&
|
|
(neigh->dev->ifindex != oldflp->oif)) ||
|
|
(oldflp->fld_src &&
|
|
(!dn_dev_islocal(neigh->dev,
|
|
oldflp->fld_src)))) {
|
|
neigh_release(neigh);
|
|
neigh = NULL;
|
|
} else {
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
|
|
dev_out = init_net.loopback_dev;
|
|
res.type = RTN_LOCAL;
|
|
} else {
|
|
dev_out = neigh->dev;
|
|
}
|
|
dev_hold(dev_out);
|
|
goto select_source;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Not there? Perhaps its a local address */
|
|
if (dev_out == NULL)
|
|
dev_out = dn_dev_get_default();
|
|
err = -ENODEV;
|
|
if (dev_out == NULL)
|
|
goto out;
|
|
dn_db = dev_out->dn_ptr;
|
|
/* Possible improvement - check all devices for local addr */
|
|
if (dn_dev_islocal(dev_out, fl.fld_dst)) {
|
|
dev_put(dev_out);
|
|
dev_out = init_net.loopback_dev;
|
|
dev_hold(dev_out);
|
|
res.type = RTN_LOCAL;
|
|
goto select_source;
|
|
}
|
|
/* Not local either.... try sending it to the default router */
|
|
neigh = neigh_clone(dn_db->router);
|
|
BUG_ON(neigh && neigh->dev != dev_out);
|
|
|
|
/* Ok then, we assume its directly connected and move on */
|
|
select_source:
|
|
if (neigh)
|
|
gateway = ((struct dn_neigh *)neigh)->addr;
|
|
if (gateway == 0)
|
|
gateway = fl.fld_dst;
|
|
if (fl.fld_src == 0) {
|
|
fl.fld_src = dnet_select_source(dev_out, gateway,
|
|
res.type == RTN_LOCAL ?
|
|
RT_SCOPE_HOST :
|
|
RT_SCOPE_LINK);
|
|
if (fl.fld_src == 0 && res.type != RTN_LOCAL)
|
|
goto e_addr;
|
|
}
|
|
fl.oif = dev_out->ifindex;
|
|
goto make_route;
|
|
}
|
|
free_res = 1;
|
|
|
|
if (res.type == RTN_NAT)
|
|
goto e_inval;
|
|
|
|
if (res.type == RTN_LOCAL) {
|
|
if (!fl.fld_src)
|
|
fl.fld_src = fl.fld_dst;
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
dev_out = init_net.loopback_dev;
|
|
dev_hold(dev_out);
|
|
fl.oif = dev_out->ifindex;
|
|
if (res.fi)
|
|
dn_fib_info_put(res.fi);
|
|
res.fi = NULL;
|
|
goto make_route;
|
|
}
|
|
|
|
if (res.fi->fib_nhs > 1 && fl.oif == 0)
|
|
dn_fib_select_multipath(&fl, &res);
|
|
|
|
/*
|
|
* We could add some logic to deal with default routes here and
|
|
* get rid of some of the special casing above.
|
|
*/
|
|
|
|
if (!fl.fld_src)
|
|
fl.fld_src = DN_FIB_RES_PREFSRC(res);
|
|
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
dev_out = DN_FIB_RES_DEV(res);
|
|
dev_hold(dev_out);
|
|
fl.oif = dev_out->ifindex;
|
|
gateway = DN_FIB_RES_GW(res);
|
|
|
|
make_route:
|
|
if (dev_out->flags & IFF_LOOPBACK)
|
|
flags |= RTCF_LOCAL;
|
|
|
|
rt = dst_alloc(&dn_dst_ops);
|
|
if (rt == NULL)
|
|
goto e_nobufs;
|
|
|
|
atomic_set(&rt->u.dst.__refcnt, 1);
|
|
rt->u.dst.flags = DST_HOST;
|
|
|
|
rt->fl.fld_src = oldflp->fld_src;
|
|
rt->fl.fld_dst = oldflp->fld_dst;
|
|
rt->fl.oif = oldflp->oif;
|
|
rt->fl.iif = 0;
|
|
rt->fl.mark = oldflp->mark;
|
|
|
|
rt->rt_saddr = fl.fld_src;
|
|
rt->rt_daddr = fl.fld_dst;
|
|
rt->rt_gateway = gateway ? gateway : fl.fld_dst;
|
|
rt->rt_local_src = fl.fld_src;
|
|
|
|
rt->rt_dst_map = fl.fld_dst;
|
|
rt->rt_src_map = fl.fld_src;
|
|
|
|
rt->u.dst.dev = dev_out;
|
|
dev_hold(dev_out);
|
|
rt->u.dst.neighbour = neigh;
|
|
neigh = NULL;
|
|
|
|
rt->u.dst.lastuse = jiffies;
|
|
rt->u.dst.output = dn_output;
|
|
rt->u.dst.input = dn_rt_bug;
|
|
rt->rt_flags = flags;
|
|
if (flags & RTCF_LOCAL)
|
|
rt->u.dst.input = dn_nsp_rx;
|
|
|
|
err = dn_rt_set_next_hop(rt, &res);
|
|
if (err)
|
|
goto e_neighbour;
|
|
|
|
hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
|
|
dn_insert_route(rt, hash, (struct dn_route **)pprt);
|
|
|
|
done:
|
|
if (neigh)
|
|
neigh_release(neigh);
|
|
if (free_res)
|
|
dn_fib_res_put(&res);
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
out:
|
|
return err;
|
|
|
|
e_addr:
|
|
err = -EADDRNOTAVAIL;
|
|
goto done;
|
|
e_inval:
|
|
err = -EINVAL;
|
|
goto done;
|
|
e_nobufs:
|
|
err = -ENOBUFS;
|
|
goto done;
|
|
e_neighbour:
|
|
dst_free(&rt->u.dst);
|
|
goto e_nobufs;
|
|
}
|
|
|
|
|
|
/*
|
|
* N.B. The flags may be moved into the flowi at some future stage.
|
|
*/
|
|
static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags)
|
|
{
|
|
unsigned hash = dn_hash(flp->fld_src, flp->fld_dst);
|
|
struct dn_route *rt = NULL;
|
|
|
|
if (!(flags & MSG_TRYHARD)) {
|
|
rcu_read_lock_bh();
|
|
for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt;
|
|
rt = rcu_dereference(rt->u.dst.dn_next)) {
|
|
if ((flp->fld_dst == rt->fl.fld_dst) &&
|
|
(flp->fld_src == rt->fl.fld_src) &&
|
|
(flp->mark == rt->fl.mark) &&
|
|
(rt->fl.iif == 0) &&
|
|
(rt->fl.oif == flp->oif)) {
|
|
dst_use(&rt->u.dst, jiffies);
|
|
rcu_read_unlock_bh();
|
|
*pprt = &rt->u.dst;
|
|
return 0;
|
|
}
|
|
}
|
|
rcu_read_unlock_bh();
|
|
}
|
|
|
|
return dn_route_output_slow(pprt, flp, flags);
|
|
}
|
|
|
|
static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags)
|
|
{
|
|
int err;
|
|
|
|
err = __dn_route_output_key(pprt, flp, flags);
|
|
if (err == 0 && flp->proto) {
|
|
err = xfrm_lookup(pprt, flp, NULL, 0);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags)
|
|
{
|
|
int err;
|
|
|
|
err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
|
|
if (err == 0 && fl->proto) {
|
|
err = xfrm_lookup(pprt, fl, sk, (flags & MSG_DONTWAIT) ?
|
|
0 : XFRM_LOOKUP_WAIT);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int dn_route_input_slow(struct sk_buff *skb)
|
|
{
|
|
struct dn_route *rt = NULL;
|
|
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
struct net_device *in_dev = skb->dev;
|
|
struct net_device *out_dev = NULL;
|
|
struct dn_dev *dn_db;
|
|
struct neighbour *neigh = NULL;
|
|
unsigned hash;
|
|
int flags = 0;
|
|
__le16 gateway = 0;
|
|
__le16 local_src = 0;
|
|
struct flowi fl = { .nl_u = { .dn_u =
|
|
{ .daddr = cb->dst,
|
|
.saddr = cb->src,
|
|
.scope = RT_SCOPE_UNIVERSE,
|
|
} },
|
|
.mark = skb->mark,
|
|
.iif = skb->dev->ifindex };
|
|
struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
|
|
int err = -EINVAL;
|
|
int free_res = 0;
|
|
|
|
dev_hold(in_dev);
|
|
|
|
if ((dn_db = in_dev->dn_ptr) == NULL)
|
|
goto out;
|
|
|
|
/* Zero source addresses are not allowed */
|
|
if (fl.fld_src == 0)
|
|
goto out;
|
|
|
|
/*
|
|
* In this case we've just received a packet from a source
|
|
* outside ourselves pretending to come from us. We don't
|
|
* allow it any further to prevent routing loops, spoofing and
|
|
* other nasties. Loopback packets already have the dst attached
|
|
* so this only affects packets which have originated elsewhere.
|
|
*/
|
|
err = -ENOTUNIQ;
|
|
if (dn_dev_islocal(in_dev, cb->src))
|
|
goto out;
|
|
|
|
err = dn_fib_lookup(&fl, &res);
|
|
if (err) {
|
|
if (err != -ESRCH)
|
|
goto out;
|
|
/*
|
|
* Is the destination us ?
|
|
*/
|
|
if (!dn_dev_islocal(in_dev, cb->dst))
|
|
goto e_inval;
|
|
|
|
res.type = RTN_LOCAL;
|
|
} else {
|
|
__le16 src_map = fl.fld_src;
|
|
free_res = 1;
|
|
|
|
out_dev = DN_FIB_RES_DEV(res);
|
|
if (out_dev == NULL) {
|
|
if (net_ratelimit())
|
|
printk(KERN_CRIT "Bug in dn_route_input_slow() "
|
|
"No output device\n");
|
|
goto e_inval;
|
|
}
|
|
dev_hold(out_dev);
|
|
|
|
if (res.r)
|
|
src_map = fl.fld_src; /* no NAT support for now */
|
|
|
|
gateway = DN_FIB_RES_GW(res);
|
|
if (res.type == RTN_NAT) {
|
|
fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res);
|
|
dn_fib_res_put(&res);
|
|
free_res = 0;
|
|
if (dn_fib_lookup(&fl, &res))
|
|
goto e_inval;
|
|
free_res = 1;
|
|
if (res.type != RTN_UNICAST)
|
|
goto e_inval;
|
|
flags |= RTCF_DNAT;
|
|
gateway = fl.fld_dst;
|
|
}
|
|
fl.fld_src = src_map;
|
|
}
|
|
|
|
switch(res.type) {
|
|
case RTN_UNICAST:
|
|
/*
|
|
* Forwarding check here, we only check for forwarding
|
|
* being turned off, if you want to only forward intra
|
|
* area, its up to you to set the routing tables up
|
|
* correctly.
|
|
*/
|
|
if (dn_db->parms.forwarding == 0)
|
|
goto e_inval;
|
|
|
|
if (res.fi->fib_nhs > 1 && fl.oif == 0)
|
|
dn_fib_select_multipath(&fl, &res);
|
|
|
|
/*
|
|
* Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
|
|
* flag as a hint to set the intra-ethernet bit when
|
|
* forwarding. If we've got NAT in operation, we don't do
|
|
* this optimisation.
|
|
*/
|
|
if (out_dev == in_dev && !(flags & RTCF_NAT))
|
|
flags |= RTCF_DOREDIRECT;
|
|
|
|
local_src = DN_FIB_RES_PREFSRC(res);
|
|
|
|
case RTN_BLACKHOLE:
|
|
case RTN_UNREACHABLE:
|
|
break;
|
|
case RTN_LOCAL:
|
|
flags |= RTCF_LOCAL;
|
|
fl.fld_src = cb->dst;
|
|
fl.fld_dst = cb->src;
|
|
|
|
/* Routing tables gave us a gateway */
|
|
if (gateway)
|
|
goto make_route;
|
|
|
|
/* Packet was intra-ethernet, so we know its on-link */
|
|
if (cb->rt_flags & DN_RT_F_IE) {
|
|
gateway = cb->src;
|
|
flags |= RTCF_DIRECTSRC;
|
|
goto make_route;
|
|
}
|
|
|
|
/* Use the default router if there is one */
|
|
neigh = neigh_clone(dn_db->router);
|
|
if (neigh) {
|
|
gateway = ((struct dn_neigh *)neigh)->addr;
|
|
goto make_route;
|
|
}
|
|
|
|
/* Close eyes and pray */
|
|
gateway = cb->src;
|
|
flags |= RTCF_DIRECTSRC;
|
|
goto make_route;
|
|
default:
|
|
goto e_inval;
|
|
}
|
|
|
|
make_route:
|
|
rt = dst_alloc(&dn_dst_ops);
|
|
if (rt == NULL)
|
|
goto e_nobufs;
|
|
|
|
rt->rt_saddr = fl.fld_src;
|
|
rt->rt_daddr = fl.fld_dst;
|
|
rt->rt_gateway = fl.fld_dst;
|
|
if (gateway)
|
|
rt->rt_gateway = gateway;
|
|
rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
|
|
|
|
rt->rt_dst_map = fl.fld_dst;
|
|
rt->rt_src_map = fl.fld_src;
|
|
|
|
rt->fl.fld_src = cb->src;
|
|
rt->fl.fld_dst = cb->dst;
|
|
rt->fl.oif = 0;
|
|
rt->fl.iif = in_dev->ifindex;
|
|
rt->fl.mark = fl.mark;
|
|
|
|
rt->u.dst.flags = DST_HOST;
|
|
rt->u.dst.neighbour = neigh;
|
|
rt->u.dst.dev = out_dev;
|
|
rt->u.dst.lastuse = jiffies;
|
|
rt->u.dst.output = dn_rt_bug;
|
|
switch(res.type) {
|
|
case RTN_UNICAST:
|
|
rt->u.dst.input = dn_forward;
|
|
break;
|
|
case RTN_LOCAL:
|
|
rt->u.dst.output = dn_output;
|
|
rt->u.dst.input = dn_nsp_rx;
|
|
rt->u.dst.dev = in_dev;
|
|
flags |= RTCF_LOCAL;
|
|
break;
|
|
default:
|
|
case RTN_UNREACHABLE:
|
|
case RTN_BLACKHOLE:
|
|
rt->u.dst.input = dst_discard;
|
|
}
|
|
rt->rt_flags = flags;
|
|
if (rt->u.dst.dev)
|
|
dev_hold(rt->u.dst.dev);
|
|
|
|
err = dn_rt_set_next_hop(rt, &res);
|
|
if (err)
|
|
goto e_neighbour;
|
|
|
|
hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
|
|
dn_insert_route(rt, hash, (struct dn_route **)&skb->dst);
|
|
|
|
done:
|
|
if (neigh)
|
|
neigh_release(neigh);
|
|
if (free_res)
|
|
dn_fib_res_put(&res);
|
|
dev_put(in_dev);
|
|
if (out_dev)
|
|
dev_put(out_dev);
|
|
out:
|
|
return err;
|
|
|
|
e_inval:
|
|
err = -EINVAL;
|
|
goto done;
|
|
|
|
e_nobufs:
|
|
err = -ENOBUFS;
|
|
goto done;
|
|
|
|
e_neighbour:
|
|
dst_free(&rt->u.dst);
|
|
goto done;
|
|
}
|
|
|
|
int dn_route_input(struct sk_buff *skb)
|
|
{
|
|
struct dn_route *rt;
|
|
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
|
unsigned hash = dn_hash(cb->src, cb->dst);
|
|
|
|
if (skb->dst)
|
|
return 0;
|
|
|
|
rcu_read_lock();
|
|
for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
|
|
rt = rcu_dereference(rt->u.dst.dn_next)) {
|
|
if ((rt->fl.fld_src == cb->src) &&
|
|
(rt->fl.fld_dst == cb->dst) &&
|
|
(rt->fl.oif == 0) &&
|
|
(rt->fl.mark == skb->mark) &&
|
|
(rt->fl.iif == cb->iif)) {
|
|
dst_use(&rt->u.dst, jiffies);
|
|
rcu_read_unlock();
|
|
skb->dst = (struct dst_entry *)rt;
|
|
return 0;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return dn_route_input_slow(skb);
|
|
}
|
|
|
|
static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
|
|
int event, int nowait, unsigned int flags)
|
|
{
|
|
struct dn_route *rt = (struct dn_route *)skb->dst;
|
|
struct rtmsg *r;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
long expires;
|
|
|
|
nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
|
|
r = NLMSG_DATA(nlh);
|
|
r->rtm_family = AF_DECnet;
|
|
r->rtm_dst_len = 16;
|
|
r->rtm_src_len = 0;
|
|
r->rtm_tos = 0;
|
|
r->rtm_table = RT_TABLE_MAIN;
|
|
RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN);
|
|
r->rtm_type = rt->rt_type;
|
|
r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
|
|
r->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
r->rtm_protocol = RTPROT_UNSPEC;
|
|
if (rt->rt_flags & RTCF_NOTIFY)
|
|
r->rtm_flags |= RTM_F_NOTIFY;
|
|
RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr);
|
|
if (rt->fl.fld_src) {
|
|
r->rtm_src_len = 16;
|
|
RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src);
|
|
}
|
|
if (rt->u.dst.dev)
|
|
RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex);
|
|
/*
|
|
* Note to self - change this if input routes reverse direction when
|
|
* they deal only with inputs and not with replies like they do
|
|
* currently.
|
|
*/
|
|
RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src);
|
|
if (rt->rt_daddr != rt->rt_gateway)
|
|
RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway);
|
|
if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
|
|
goto rtattr_failure;
|
|
expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0;
|
|
if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, expires,
|
|
rt->u.dst.error) < 0)
|
|
goto rtattr_failure;
|
|
if (rt->fl.iif)
|
|
RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
rtattr_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* This is called by both endnodes and routers now.
|
|
*/
|
|
static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = in_skb->sk->sk_net;
|
|
struct rtattr **rta = arg;
|
|
struct rtmsg *rtm = NLMSG_DATA(nlh);
|
|
struct dn_route *rt = NULL;
|
|
struct dn_skb_cb *cb;
|
|
int err;
|
|
struct sk_buff *skb;
|
|
struct flowi fl;
|
|
|
|
if (net != &init_net)
|
|
return -EINVAL;
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
fl.proto = DNPROTO_NSP;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
return -ENOBUFS;
|
|
skb_reset_mac_header(skb);
|
|
cb = DN_SKB_CB(skb);
|
|
|
|
if (rta[RTA_SRC-1])
|
|
memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2);
|
|
if (rta[RTA_DST-1])
|
|
memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2);
|
|
if (rta[RTA_IIF-1])
|
|
memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
|
|
|
|
if (fl.iif) {
|
|
struct net_device *dev;
|
|
if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) {
|
|
kfree_skb(skb);
|
|
return -ENODEV;
|
|
}
|
|
if (!dev->dn_ptr) {
|
|
dev_put(dev);
|
|
kfree_skb(skb);
|
|
return -ENODEV;
|
|
}
|
|
skb->protocol = htons(ETH_P_DNA_RT);
|
|
skb->dev = dev;
|
|
cb->src = fl.fld_src;
|
|
cb->dst = fl.fld_dst;
|
|
local_bh_disable();
|
|
err = dn_route_input(skb);
|
|
local_bh_enable();
|
|
memset(cb, 0, sizeof(struct dn_skb_cb));
|
|
rt = (struct dn_route *)skb->dst;
|
|
if (!err && -rt->u.dst.error)
|
|
err = rt->u.dst.error;
|
|
} else {
|
|
int oif = 0;
|
|
if (rta[RTA_OIF - 1])
|
|
memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
|
|
fl.oif = oif;
|
|
err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0);
|
|
}
|
|
|
|
if (skb->dev)
|
|
dev_put(skb->dev);
|
|
skb->dev = NULL;
|
|
if (err)
|
|
goto out_free;
|
|
skb->dst = &rt->u.dst;
|
|
if (rtm->rtm_flags & RTM_F_NOTIFY)
|
|
rt->rt_flags |= RTCF_NOTIFY;
|
|
|
|
err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
|
|
|
|
if (err == 0)
|
|
goto out_free;
|
|
if (err < 0) {
|
|
err = -EMSGSIZE;
|
|
goto out_free;
|
|
}
|
|
|
|
return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
|
|
|
|
out_free:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* For routers, this is called from dn_fib_dump, but for endnodes its
|
|
* called directly from the rtnetlink dispatch table.
|
|
*/
|
|
int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = skb->sk->sk_net;
|
|
struct dn_route *rt;
|
|
int h, s_h;
|
|
int idx, s_idx;
|
|
|
|
if (net != &init_net)
|
|
return 0;
|
|
|
|
if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
|
|
return -EINVAL;
|
|
if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
|
|
return 0;
|
|
|
|
s_h = cb->args[0];
|
|
s_idx = idx = cb->args[1];
|
|
for(h = 0; h <= dn_rt_hash_mask; h++) {
|
|
if (h < s_h)
|
|
continue;
|
|
if (h > s_h)
|
|
s_idx = 0;
|
|
rcu_read_lock_bh();
|
|
for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0;
|
|
rt;
|
|
rt = rcu_dereference(rt->u.dst.dn_next), idx++) {
|
|
if (idx < s_idx)
|
|
continue;
|
|
skb->dst = dst_clone(&rt->u.dst);
|
|
if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq, RTM_NEWROUTE,
|
|
1, NLM_F_MULTI) <= 0) {
|
|
dst_release(xchg(&skb->dst, NULL));
|
|
rcu_read_unlock_bh();
|
|
goto done;
|
|
}
|
|
dst_release(xchg(&skb->dst, NULL));
|
|
}
|
|
rcu_read_unlock_bh();
|
|
}
|
|
|
|
done:
|
|
cb->args[0] = h;
|
|
cb->args[1] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
struct dn_rt_cache_iter_state {
|
|
int bucket;
|
|
};
|
|
|
|
static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
|
|
{
|
|
struct dn_route *rt = NULL;
|
|
struct dn_rt_cache_iter_state *s = seq->private;
|
|
|
|
for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
|
|
rcu_read_lock_bh();
|
|
rt = dn_rt_hash_table[s->bucket].chain;
|
|
if (rt)
|
|
break;
|
|
rcu_read_unlock_bh();
|
|
}
|
|
return rcu_dereference(rt);
|
|
}
|
|
|
|
static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
|
|
{
|
|
struct dn_rt_cache_iter_state *s = seq->private;
|
|
|
|
rt = rt->u.dst.dn_next;
|
|
while(!rt) {
|
|
rcu_read_unlock_bh();
|
|
if (--s->bucket < 0)
|
|
break;
|
|
rcu_read_lock_bh();
|
|
rt = dn_rt_hash_table[s->bucket].chain;
|
|
}
|
|
return rcu_dereference(rt);
|
|
}
|
|
|
|
static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct dn_route *rt = dn_rt_cache_get_first(seq);
|
|
|
|
if (rt) {
|
|
while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
|
|
--*pos;
|
|
}
|
|
return *pos ? NULL : rt;
|
|
}
|
|
|
|
static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct dn_route *rt = dn_rt_cache_get_next(seq, v);
|
|
++*pos;
|
|
return rt;
|
|
}
|
|
|
|
static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
if (v)
|
|
rcu_read_unlock_bh();
|
|
}
|
|
|
|
static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct dn_route *rt = v;
|
|
char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
|
|
|
|
seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
|
|
rt->u.dst.dev ? rt->u.dst.dev->name : "*",
|
|
dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1),
|
|
dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2),
|
|
atomic_read(&rt->u.dst.__refcnt),
|
|
rt->u.dst.__use,
|
|
(int) dst_metric(&rt->u.dst, RTAX_RTT));
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations dn_rt_cache_seq_ops = {
|
|
.start = dn_rt_cache_seq_start,
|
|
.next = dn_rt_cache_seq_next,
|
|
.stop = dn_rt_cache_seq_stop,
|
|
.show = dn_rt_cache_seq_show,
|
|
};
|
|
|
|
static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_private(file, &dn_rt_cache_seq_ops,
|
|
sizeof(struct dn_rt_cache_iter_state));
|
|
}
|
|
|
|
static const struct file_operations dn_rt_cache_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = dn_rt_cache_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
};
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
void __init dn_route_init(void)
|
|
{
|
|
int i, goal, order;
|
|
|
|
dn_dst_ops.kmem_cachep =
|
|
kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
|
|
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
|
|
setup_timer(&dn_route_timer, dn_dst_check_expire, 0);
|
|
dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
|
|
add_timer(&dn_route_timer);
|
|
|
|
goal = num_physpages >> (26 - PAGE_SHIFT);
|
|
|
|
for(order = 0; (1UL << order) < goal; order++)
|
|
/* NOTHING */;
|
|
|
|
/*
|
|
* Only want 1024 entries max, since the table is very, very unlikely
|
|
* to be larger than that.
|
|
*/
|
|
while(order && ((((1UL << order) * PAGE_SIZE) /
|
|
sizeof(struct dn_rt_hash_bucket)) >= 2048))
|
|
order--;
|
|
|
|
do {
|
|
dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
|
|
sizeof(struct dn_rt_hash_bucket);
|
|
while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
|
|
dn_rt_hash_mask--;
|
|
dn_rt_hash_table = (struct dn_rt_hash_bucket *)
|
|
__get_free_pages(GFP_ATOMIC, order);
|
|
} while (dn_rt_hash_table == NULL && --order > 0);
|
|
|
|
if (!dn_rt_hash_table)
|
|
panic("Failed to allocate DECnet route cache hash table\n");
|
|
|
|
printk(KERN_INFO
|
|
"DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
|
|
dn_rt_hash_mask,
|
|
(long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
|
|
|
|
dn_rt_hash_mask--;
|
|
for(i = 0; i <= dn_rt_hash_mask; i++) {
|
|
spin_lock_init(&dn_rt_hash_table[i].lock);
|
|
dn_rt_hash_table[i].chain = NULL;
|
|
}
|
|
|
|
dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
|
|
|
|
proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
|
|
|
|
#ifdef CONFIG_DECNET_ROUTER
|
|
rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump);
|
|
#else
|
|
rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
|
|
dn_cache_dump);
|
|
#endif
|
|
}
|
|
|
|
void __exit dn_route_cleanup(void)
|
|
{
|
|
del_timer(&dn_route_timer);
|
|
dn_run_flush(0);
|
|
|
|
proc_net_remove(&init_net, "decnet_cache");
|
|
}
|
|
|