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1922 lines
47 KiB
1922 lines
47 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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 Functions (Endnode and Router) |
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* |
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* Authors: Steve Whitehouse <[email protected]> |
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* Eduardo Marcelo Serrat <[email protected]> |
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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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/****************************************************************************** |
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(c) 1995-1998 E.M. Serrat [email protected] |
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|
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*******************************************************************************/ |
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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 <linux/slab.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 <linux/export.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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|
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struct dn_rt_hash_bucket { |
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struct dn_route __rcu *chain; |
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spinlock_t lock; |
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}; |
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|
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extern struct neigh_table dn_neigh_table; |
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|
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|
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static unsigned char dn_hiord_addr[6] = {0xAA, 0x00, 0x04, 0x00, 0x00, 0x00}; |
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|
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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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|
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static unsigned long dn_rt_deadline; |
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|
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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 unsigned int dn_dst_default_advmss(const struct dst_entry *dst); |
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static unsigned int dn_dst_mtu(const struct dst_entry *dst); |
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static void dn_dst_destroy(struct dst_entry *); |
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static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how); |
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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, struct sock *sk, |
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struct sk_buff *skb , u32 mtu, |
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bool confirm_neigh); |
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static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk, |
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struct sk_buff *skb); |
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static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, |
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struct sk_buff *skb, |
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const void *daddr); |
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static int dn_route_input(struct sk_buff *); |
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static void dn_run_flush(struct timer_list *unused); |
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|
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static struct dn_rt_hash_bucket *dn_rt_hash_table; |
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static unsigned int dn_rt_hash_mask; |
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|
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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); |
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int decnet_dst_gc_interval = 2; |
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|
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static struct dst_ops dn_dst_ops = { |
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.family = PF_DECnet, |
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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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.default_advmss = dn_dst_default_advmss, |
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.mtu = dn_dst_mtu, |
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.cow_metrics = dst_cow_metrics_generic, |
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.destroy = dn_dst_destroy, |
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.ifdown = dn_dst_ifdown, |
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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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.redirect = dn_dst_redirect, |
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.neigh_lookup = dn_dst_neigh_lookup, |
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}; |
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|
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static void dn_dst_destroy(struct dst_entry *dst) |
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{ |
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struct dn_route *rt = (struct dn_route *) dst; |
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|
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if (rt->n) |
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neigh_release(rt->n); |
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dst_destroy_metrics_generic(dst); |
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} |
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|
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static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how) |
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{ |
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if (how) { |
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struct dn_route *rt = (struct dn_route *) dst; |
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struct neighbour *n = rt->n; |
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|
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if (n && n->dev == dev) { |
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n->dev = dev_net(dev)->loopback_dev; |
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dev_hold(n->dev); |
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dev_put(dev); |
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} |
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} |
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} |
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static __inline__ unsigned int 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 int)tmp; |
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} |
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|
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static void dn_dst_check_expire(struct timer_list *unused) |
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{ |
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int i; |
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struct dn_route *rt; |
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struct dn_route __rcu **rtp; |
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unsigned long now = jiffies; |
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unsigned long expire = 120 * HZ; |
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|
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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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|
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spin_lock(&dn_rt_hash_table[i].lock); |
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while ((rt = rcu_dereference_protected(*rtp, |
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lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { |
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if (atomic_read(&rt->dst.__refcnt) > 1 || |
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(now - rt->dst.lastuse) < expire) { |
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rtp = &rt->dn_next; |
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continue; |
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} |
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*rtp = rt->dn_next; |
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rt->dn_next = NULL; |
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dst_dev_put(&rt->dst); |
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dst_release(&rt->dst); |
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} |
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spin_unlock(&dn_rt_hash_table[i].lock); |
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|
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if ((jiffies - now) > 0) |
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break; |
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} |
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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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|
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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; |
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struct dn_route __rcu **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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|
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for (i = 0; i <= dn_rt_hash_mask; i++) { |
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|
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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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|
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while ((rt = rcu_dereference_protected(*rtp, |
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lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { |
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if (atomic_read(&rt->dst.__refcnt) > 1 || |
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(now - rt->dst.lastuse) < expire) { |
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rtp = &rt->dn_next; |
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continue; |
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} |
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*rtp = rt->dn_next; |
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rt->dn_next = NULL; |
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dst_dev_put(&rt->dst); |
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dst_release(&rt->dst); |
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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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/* |
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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, struct sock *sk, |
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struct sk_buff *skb, u32 mtu, |
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bool confirm_neigh) |
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{ |
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struct dn_route *rt = (struct dn_route *) dst; |
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struct neighbour *n = rt->n; |
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u32 min_mtu = 230; |
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struct dn_dev *dn; |
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dn = n ? rcu_dereference_raw(n->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_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) { |
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if (!(dst_metric_locked(dst, RTAX_MTU))) { |
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dst_metric_set(dst, RTAX_MTU, 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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u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS); |
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if (!existing_mss || existing_mss > mss) |
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dst_metric_set(dst, RTAX_ADVMSS, mss); |
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} |
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} |
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} |
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static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk, |
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struct sk_buff *skb) |
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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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} |
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static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2) |
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{ |
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return ((fl1->daddr ^ fl2->daddr) | |
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(fl1->saddr ^ fl2->saddr) | |
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(fl1->flowidn_mark ^ fl2->flowidn_mark) | |
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(fl1->flowidn_scope ^ fl2->flowidn_scope) | |
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(fl1->flowidn_oif ^ fl2->flowidn_oif) | |
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(fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0; |
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} |
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static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp) |
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{ |
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struct dn_route *rth; |
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struct dn_route __rcu **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 = rcu_dereference_protected(*rthp, |
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lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) { |
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if (compare_keys(&rth->fld, &rt->fld)) { |
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/* Put it first */ |
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*rthp = rth->dn_next; |
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rcu_assign_pointer(rth->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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|
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dst_hold_and_use(&rth->dst, now); |
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spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
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|
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dst_release_immediate(&rt->dst); |
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*rp = rth; |
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return 0; |
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} |
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rthp = &rth->dn_next; |
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} |
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|
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rcu_assign_pointer(rt->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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|
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dst_hold_and_use(&rt->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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static void dn_run_flush(struct timer_list *unused) |
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{ |
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int i; |
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struct dn_route *rt, *next; |
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|
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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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|
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rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL); |
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if (!rt) |
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goto nothing_to_declare; |
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|
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for (; rt; rt = next) { |
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next = rcu_dereference_raw(rt->dn_next); |
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RCU_INIT_POINTER(rt->dn_next, NULL); |
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dst_dev_put(&rt->dst); |
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dst_release(&rt->dst); |
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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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|
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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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|
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if (delay < 0) |
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delay = dn_rt_min_delay; |
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|
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spin_lock_bh(&dn_rt_flush_lock); |
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|
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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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|
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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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|
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if (delay > tmo) |
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delay = tmo; |
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} |
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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(NULL); |
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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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/** |
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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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|
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/* Add back headers */ |
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skb_push(skb, skb->data - skb_network_header(skb)); |
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|
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skb = skb_unshare(skb, GFP_ATOMIC); |
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if (!skb) |
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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; |
|
|
|
dst = (__le16 *)ptr; |
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ptr += 2; |
|
src = (__le16 *)ptr; |
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ptr += 2; |
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*ptr = 0; /* Zero hop count */ |
|
|
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swap(*src, *dst); |
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|
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skb->pkt_type = PACKET_OUTGOING; |
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dn_rt_finish_output(skb, NULL, NULL); |
|
return NET_RX_SUCCESS; |
|
} |
|
|
|
/** |
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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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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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/* Add back all headers */ |
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skb_push(skb, skb->data - skb_network_header(skb)); |
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|
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skb = skb_unshare(skb, GFP_ATOMIC); |
|
if (!skb) |
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return NET_RX_DROP; |
|
|
|
cb = DN_SKB_CB(skb); |
|
/* Ignore packet length and point to flags */ |
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ptr = skb->data + 2; |
|
|
|
/* Skip padding */ |
|
if (*ptr & DN_RT_F_PF) { |
|
char padlen = (*ptr & ~DN_RT_F_PF); |
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ptr += padlen; |
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} |
|
|
|
*ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
|
ptr += 2; |
|
dst_addr = ptr; |
|
ptr += 8; |
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src_addr = ptr; |
|
ptr += 6; |
|
*ptr = 0; /* Zero hop count */ |
|
|
|
/* Swap source and destination */ |
|
memcpy(tmp, src_addr, ETH_ALEN); |
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memcpy(src_addr, dst_addr, ETH_ALEN); |
|
memcpy(dst_addr, tmp, ETH_ALEN); |
|
|
|
skb->pkt_type = PACKET_OUTGOING; |
|
dn_rt_finish_output(skb, dst_addr, src_addr); |
|
return NET_RX_SUCCESS; |
|
} |
|
|
|
/** |
|
* dn_route_rx_packet - Try and find a route for an incoming packet |
|
* @net: The applicable net namespace |
|
* @sk: Socket packet transmitted on |
|
* @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 net *net, struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct dn_skb_cb *cb; |
|
int err; |
|
|
|
err = dn_route_input(skb); |
|
if (err == 0) |
|
return dst_input(skb); |
|
|
|
cb = DN_SKB_CB(skb); |
|
if (decnet_debug_level & 4) { |
|
char *devname = skb->dev ? skb->dev->name : "???"; |
|
|
|
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, |
|
le16_to_cpu(cb->src), le16_to_cpu(cb->dst), |
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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(NFPROTO_DECNET, NF_DN_PRE_ROUTING, |
|
&init_net, NULL, 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(NFPROTO_DECNET, NF_DN_PRE_ROUTING, |
|
&init_net, NULL, skb, skb->dev, NULL, |
|
dn_route_rx_packet); |
|
|
|
drop_it: |
|
kfree_skb(skb); |
|
return NET_RX_DROP; |
|
} |
|
|
|
static int dn_route_discard(struct net *net, struct sock *sk, struct sk_buff *skb) |
|
{ |
|
/* |
|
* I know we drop the packet here, but that's considered success in |
|
* this case |
|
*/ |
|
kfree_skb(skb); |
|
return NET_RX_SUCCESS; |
|
} |
|
|
|
static int dn_route_ptp_hello(struct net *net, struct sock *sk, 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 = le16_to_cpu(*(__le16 *)skb->data); |
|
struct dn_dev *dn = rcu_dereference(dev->dn_ptr); |
|
unsigned char padlen = 0; |
|
|
|
if (!net_eq(dev_net(dev), &init_net)) |
|
goto dump_it; |
|
|
|
if (dn == NULL) |
|
goto dump_it; |
|
|
|
skb = skb_share_check(skb, GFP_ATOMIC); |
|
if (!skb) |
|
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->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(NFPROTO_DECNET, NF_DN_HELLO, |
|
&init_net, NULL, skb, skb->dev, NULL, |
|
dn_route_ptp_hello); |
|
|
|
case DN_RT_PKT_L1RT: |
|
case DN_RT_PKT_L2RT: |
|
return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE, |
|
&init_net, NULL, skb, skb->dev, NULL, |
|
dn_route_discard); |
|
case DN_RT_PKT_ERTH: |
|
return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
|
&init_net, NULL, skb, skb->dev, NULL, |
|
dn_neigh_router_hello); |
|
|
|
case DN_RT_PKT_EEDH: |
|
return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
|
&init_net, NULL, 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 net *net, struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct dst_entry *dst = skb_dst(skb); |
|
struct dn_route *rt = (struct dn_route *)dst; |
|
struct net_device *dev = dst->dev; |
|
struct dn_skb_cb *cb = DN_SKB_CB(skb); |
|
|
|
int err = -EINVAL; |
|
|
|
if (rt->n == 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(NFPROTO_DECNET, NF_DN_LOCAL_OUT, |
|
&init_net, sk, skb, NULL, dev, |
|
dn_to_neigh_output); |
|
|
|
error: |
|
net_dbg_ratelimited("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(skb); |
|
struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr); |
|
struct dn_route *rt; |
|
int header_len; |
|
struct net_device *dev = skb->dev; |
|
|
|
if (skb->pkt_type != PACKET_HOST) |
|
goto drop; |
|
|
|
/* Ensure that we have enough space for headers */ |
|
rt = (struct dn_route *)skb_dst(skb); |
|
header_len = dn_db->use_long ? 21 : 6; |
|
if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len)) |
|
goto drop; |
|
|
|
/* |
|
* Hop count exceeded. |
|
*/ |
|
if (++cb->hops > 30) |
|
goto drop; |
|
|
|
skb->dev = rt->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(NFPROTO_DECNET, NF_DN_FORWARD, |
|
&init_net, NULL, skb, dev, skb->dev, |
|
dn_to_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_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct dn_skb_cb *cb = DN_SKB_CB(skb); |
|
|
|
net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n", |
|
le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); |
|
|
|
kfree_skb(skb); |
|
|
|
return NET_RX_DROP; |
|
} |
|
|
|
static int dn_rt_bug(struct sk_buff *skb) |
|
{ |
|
struct dn_skb_cb *cb = DN_SKB_CB(skb); |
|
|
|
net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n", |
|
le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); |
|
|
|
kfree_skb(skb); |
|
|
|
return NET_RX_DROP; |
|
} |
|
|
|
static unsigned int dn_dst_default_advmss(const struct dst_entry *dst) |
|
{ |
|
return dn_mss_from_pmtu(dst->dev, dst_mtu(dst)); |
|
} |
|
|
|
static unsigned int dn_dst_mtu(const struct dst_entry *dst) |
|
{ |
|
unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
|
|
|
return mtu ? : dst->dev->mtu; |
|
} |
|
|
|
static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, |
|
struct sk_buff *skb, |
|
const void *daddr) |
|
{ |
|
return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev); |
|
} |
|
|
|
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->dst.dev; |
|
unsigned int mss_metric; |
|
struct neighbour *n; |
|
|
|
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); |
|
dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
|
} |
|
rt->rt_type = res->type; |
|
|
|
if (dev != NULL && rt->n == NULL) { |
|
n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
|
if (IS_ERR(n)) |
|
return PTR_ERR(n); |
|
rt->n = n; |
|
} |
|
|
|
if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu) |
|
dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu); |
|
mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS); |
|
if (mss_metric) { |
|
unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst)); |
|
if (mss_metric > mss) |
|
dst_metric_set(&rt->dst, RTAX_ADVMSS, mss); |
|
} |
|
return 0; |
|
} |
|
|
|
static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
|
{ |
|
__u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(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; |
|
struct dn_ifaddr *ifa; |
|
int best_match = 0; |
|
int ret; |
|
|
|
rcu_read_lock(); |
|
dn_db = rcu_dereference(dev->dn_ptr); |
|
for (ifa = rcu_dereference(dn_db->ifa_list); |
|
ifa != NULL; |
|
ifa = rcu_dereference(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; |
|
} |
|
rcu_read_unlock(); |
|
|
|
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 flowidn *oldflp, int try_hard) |
|
{ |
|
struct flowidn fld = { |
|
.daddr = oldflp->daddr, |
|
.saddr = oldflp->saddr, |
|
.flowidn_scope = RT_SCOPE_UNIVERSE, |
|
.flowidn_mark = oldflp->flowidn_mark, |
|
.flowidn_iif = LOOPBACK_IFINDEX, |
|
.flowidn_oif = oldflp->flowidn_oif, |
|
}; |
|
struct dn_route *rt = NULL; |
|
struct net_device *dev_out = NULL, *dev; |
|
struct neighbour *neigh = NULL; |
|
unsigned int hash; |
|
unsigned int 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", le16_to_cpu(oldflp->daddr), |
|
le16_to_cpu(oldflp->saddr), |
|
oldflp->flowidn_mark, LOOPBACK_IFINDEX, |
|
oldflp->flowidn_oif); |
|
|
|
/* If we have an output interface, verify its a DECnet device */ |
|
if (oldflp->flowidn_oif) { |
|
dev_out = dev_get_by_index(&init_net, oldflp->flowidn_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->saddr) { |
|
err = -EADDRNOTAVAIL; |
|
|
|
if (dev_out) { |
|
if (dn_dev_islocal(dev_out, oldflp->saddr)) |
|
goto source_ok; |
|
dev_put(dev_out); |
|
goto out; |
|
} |
|
rcu_read_lock(); |
|
for_each_netdev_rcu(&init_net, dev) { |
|
if (!dev->dn_ptr) |
|
continue; |
|
if (!dn_dev_islocal(dev, oldflp->saddr)) |
|
continue; |
|
if ((dev->flags & IFF_LOOPBACK) && |
|
oldflp->daddr && |
|
!dn_dev_islocal(dev, oldflp->daddr)) |
|
continue; |
|
|
|
dev_out = dev; |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
if (dev_out == NULL) |
|
goto out; |
|
dev_hold(dev_out); |
|
source_ok: |
|
; |
|
} |
|
|
|
/* No destination? Assume its local */ |
|
if (!fld.daddr) { |
|
fld.daddr = fld.saddr; |
|
|
|
dev_put(dev_out); |
|
err = -EINVAL; |
|
dev_out = init_net.loopback_dev; |
|
if (!dev_out->dn_ptr) |
|
goto out; |
|
err = -EADDRNOTAVAIL; |
|
dev_hold(dev_out); |
|
if (!fld.daddr) { |
|
fld.daddr = |
|
fld.saddr = dnet_select_source(dev_out, 0, |
|
RT_SCOPE_HOST); |
|
if (!fld.daddr) |
|
goto done; |
|
} |
|
fld.flowidn_oif = LOOPBACK_IFINDEX; |
|
res.type = RTN_LOCAL; |
|
goto make_route; |
|
} |
|
|
|
if (decnet_debug_level & 16) |
|
printk(KERN_DEBUG |
|
"dn_route_output_slow: initial checks complete." |
|
" dst=%04x src=%04x oif=%d try_hard=%d\n", |
|
le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr), |
|
fld.flowidn_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(&fld, &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, &fld.daddr); |
|
if (neigh) { |
|
if ((oldflp->flowidn_oif && |
|
(neigh->dev->ifindex != oldflp->flowidn_oif)) || |
|
(oldflp->saddr && |
|
(!dn_dev_islocal(neigh->dev, |
|
oldflp->saddr)))) { |
|
neigh_release(neigh); |
|
neigh = NULL; |
|
} else { |
|
dev_put(dev_out); |
|
if (dn_dev_islocal(neigh->dev, fld.daddr)) { |
|
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 = rcu_dereference_raw(dev_out->dn_ptr); |
|
if (!dn_db) |
|
goto e_inval; |
|
/* Possible improvement - check all devices for local addr */ |
|
if (dn_dev_islocal(dev_out, fld.daddr)) { |
|
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 = fld.daddr; |
|
if (fld.saddr == 0) { |
|
fld.saddr = dnet_select_source(dev_out, gateway, |
|
res.type == RTN_LOCAL ? |
|
RT_SCOPE_HOST : |
|
RT_SCOPE_LINK); |
|
if (fld.saddr == 0 && res.type != RTN_LOCAL) |
|
goto e_addr; |
|
} |
|
fld.flowidn_oif = dev_out->ifindex; |
|
goto make_route; |
|
} |
|
free_res = 1; |
|
|
|
if (res.type == RTN_NAT) |
|
goto e_inval; |
|
|
|
if (res.type == RTN_LOCAL) { |
|
if (!fld.saddr) |
|
fld.saddr = fld.daddr; |
|
dev_put(dev_out); |
|
dev_out = init_net.loopback_dev; |
|
dev_hold(dev_out); |
|
if (!dev_out->dn_ptr) |
|
goto e_inval; |
|
fld.flowidn_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 && fld.flowidn_oif == 0) |
|
dn_fib_select_multipath(&fld, &res); |
|
|
|
/* |
|
* We could add some logic to deal with default routes here and |
|
* get rid of some of the special casing above. |
|
*/ |
|
|
|
if (!fld.saddr) |
|
fld.saddr = DN_FIB_RES_PREFSRC(res); |
|
|
|
dev_put(dev_out); |
|
dev_out = DN_FIB_RES_DEV(res); |
|
dev_hold(dev_out); |
|
fld.flowidn_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, dev_out, 0, DST_OBSOLETE_NONE, 0); |
|
if (rt == NULL) |
|
goto e_nobufs; |
|
|
|
rt->dn_next = NULL; |
|
memset(&rt->fld, 0, sizeof(rt->fld)); |
|
rt->fld.saddr = oldflp->saddr; |
|
rt->fld.daddr = oldflp->daddr; |
|
rt->fld.flowidn_oif = oldflp->flowidn_oif; |
|
rt->fld.flowidn_iif = 0; |
|
rt->fld.flowidn_mark = oldflp->flowidn_mark; |
|
|
|
rt->rt_saddr = fld.saddr; |
|
rt->rt_daddr = fld.daddr; |
|
rt->rt_gateway = gateway ? gateway : fld.daddr; |
|
rt->rt_local_src = fld.saddr; |
|
|
|
rt->rt_dst_map = fld.daddr; |
|
rt->rt_src_map = fld.saddr; |
|
|
|
rt->n = neigh; |
|
neigh = NULL; |
|
|
|
rt->dst.lastuse = jiffies; |
|
rt->dst.output = dn_output; |
|
rt->dst.input = dn_rt_bug; |
|
rt->rt_flags = flags; |
|
if (flags & RTCF_LOCAL) |
|
rt->dst.input = dn_nsp_rx; |
|
|
|
err = dn_rt_set_next_hop(rt, &res); |
|
if (err) |
|
goto e_neighbour; |
|
|
|
hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
|
/* dn_insert_route() increments dst->__refcnt */ |
|
dn_insert_route(rt, hash, (struct dn_route **)pprt); |
|
|
|
done: |
|
if (neigh) |
|
neigh_release(neigh); |
|
if (free_res) |
|
dn_fib_res_put(&res); |
|
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_release_immediate(&rt->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 flowidn *flp, int flags) |
|
{ |
|
unsigned int hash = dn_hash(flp->saddr, flp->daddr); |
|
struct dn_route *rt = NULL; |
|
|
|
if (!(flags & MSG_TRYHARD)) { |
|
rcu_read_lock_bh(); |
|
for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt; |
|
rt = rcu_dereference_bh(rt->dn_next)) { |
|
if ((flp->daddr == rt->fld.daddr) && |
|
(flp->saddr == rt->fld.saddr) && |
|
(flp->flowidn_mark == rt->fld.flowidn_mark) && |
|
dn_is_output_route(rt) && |
|
(rt->fld.flowidn_oif == flp->flowidn_oif)) { |
|
dst_hold_and_use(&rt->dst, jiffies); |
|
rcu_read_unlock_bh(); |
|
*pprt = &rt->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 flowidn *flp, int flags) |
|
{ |
|
int err; |
|
|
|
err = __dn_route_output_key(pprt, flp, flags); |
|
if (err == 0 && flp->flowidn_proto) { |
|
*pprt = xfrm_lookup(&init_net, *pprt, |
|
flowidn_to_flowi(flp), NULL, 0); |
|
if (IS_ERR(*pprt)) { |
|
err = PTR_ERR(*pprt); |
|
*pprt = NULL; |
|
} |
|
} |
|
return err; |
|
} |
|
|
|
int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *fl, struct sock *sk, int flags) |
|
{ |
|
int err; |
|
|
|
err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); |
|
if (err == 0 && fl->flowidn_proto) { |
|
*pprt = xfrm_lookup(&init_net, *pprt, |
|
flowidn_to_flowi(fl), sk, 0); |
|
if (IS_ERR(*pprt)) { |
|
err = PTR_ERR(*pprt); |
|
*pprt = NULL; |
|
} |
|
} |
|
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 int hash; |
|
int flags = 0; |
|
__le16 gateway = 0; |
|
__le16 local_src = 0; |
|
struct flowidn fld = { |
|
.daddr = cb->dst, |
|
.saddr = cb->src, |
|
.flowidn_scope = RT_SCOPE_UNIVERSE, |
|
.flowidn_mark = skb->mark, |
|
.flowidn_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); |
|
|
|
dn_db = rcu_dereference(in_dev->dn_ptr); |
|
if (!dn_db) |
|
goto out; |
|
|
|
/* Zero source addresses are not allowed */ |
|
if (fld.saddr == 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(&fld, &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 = fld.saddr; |
|
free_res = 1; |
|
|
|
out_dev = DN_FIB_RES_DEV(res); |
|
if (out_dev == NULL) { |
|
net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n"); |
|
goto e_inval; |
|
} |
|
dev_hold(out_dev); |
|
|
|
if (res.r) |
|
src_map = fld.saddr; /* no NAT support for now */ |
|
|
|
gateway = DN_FIB_RES_GW(res); |
|
if (res.type == RTN_NAT) { |
|
fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res); |
|
dn_fib_res_put(&res); |
|
free_res = 0; |
|
if (dn_fib_lookup(&fld, &res)) |
|
goto e_inval; |
|
free_res = 1; |
|
if (res.type != RTN_UNICAST) |
|
goto e_inval; |
|
flags |= RTCF_DNAT; |
|
gateway = fld.daddr; |
|
} |
|
fld.saddr = 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 && fld.flowidn_oif == 0) |
|
dn_fib_select_multipath(&fld, &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); |
|
break; |
|
case RTN_BLACKHOLE: |
|
case RTN_UNREACHABLE: |
|
break; |
|
case RTN_LOCAL: |
|
flags |= RTCF_LOCAL; |
|
fld.saddr = cb->dst; |
|
fld.daddr = 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; |
|
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; |
|
goto make_route; |
|
default: |
|
goto e_inval; |
|
} |
|
|
|
make_route: |
|
rt = dst_alloc(&dn_dst_ops, out_dev, 1, DST_OBSOLETE_NONE, 0); |
|
if (rt == NULL) |
|
goto e_nobufs; |
|
|
|
rt->dn_next = NULL; |
|
memset(&rt->fld, 0, sizeof(rt->fld)); |
|
rt->rt_saddr = fld.saddr; |
|
rt->rt_daddr = fld.daddr; |
|
rt->rt_gateway = fld.daddr; |
|
if (gateway) |
|
rt->rt_gateway = gateway; |
|
rt->rt_local_src = local_src ? local_src : rt->rt_saddr; |
|
|
|
rt->rt_dst_map = fld.daddr; |
|
rt->rt_src_map = fld.saddr; |
|
|
|
rt->fld.saddr = cb->src; |
|
rt->fld.daddr = cb->dst; |
|
rt->fld.flowidn_oif = 0; |
|
rt->fld.flowidn_iif = in_dev->ifindex; |
|
rt->fld.flowidn_mark = fld.flowidn_mark; |
|
|
|
rt->n = neigh; |
|
rt->dst.lastuse = jiffies; |
|
rt->dst.output = dn_rt_bug_out; |
|
switch (res.type) { |
|
case RTN_UNICAST: |
|
rt->dst.input = dn_forward; |
|
break; |
|
case RTN_LOCAL: |
|
rt->dst.output = dn_output; |
|
rt->dst.input = dn_nsp_rx; |
|
rt->dst.dev = in_dev; |
|
flags |= RTCF_LOCAL; |
|
break; |
|
default: |
|
case RTN_UNREACHABLE: |
|
case RTN_BLACKHOLE: |
|
rt->dst.input = dst_discard; |
|
} |
|
rt->rt_flags = flags; |
|
|
|
err = dn_rt_set_next_hop(rt, &res); |
|
if (err) |
|
goto e_neighbour; |
|
|
|
hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
|
/* dn_insert_route() increments dst->__refcnt */ |
|
dn_insert_route(rt, hash, &rt); |
|
skb_dst_set(skb, &rt->dst); |
|
|
|
done: |
|
if (neigh) |
|
neigh_release(neigh); |
|
if (free_res) |
|
dn_fib_res_put(&res); |
|
dev_put(in_dev); |
|
dev_put(out_dev); |
|
out: |
|
return err; |
|
|
|
e_inval: |
|
err = -EINVAL; |
|
goto done; |
|
|
|
e_nobufs: |
|
err = -ENOBUFS; |
|
goto done; |
|
|
|
e_neighbour: |
|
dst_release_immediate(&rt->dst); |
|
goto done; |
|
} |
|
|
|
static int dn_route_input(struct sk_buff *skb) |
|
{ |
|
struct dn_route *rt; |
|
struct dn_skb_cb *cb = DN_SKB_CB(skb); |
|
unsigned int hash = dn_hash(cb->src, cb->dst); |
|
|
|
if (skb_dst(skb)) |
|
return 0; |
|
|
|
rcu_read_lock(); |
|
for (rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; |
|
rt = rcu_dereference(rt->dn_next)) { |
|
if ((rt->fld.saddr == cb->src) && |
|
(rt->fld.daddr == cb->dst) && |
|
(rt->fld.flowidn_oif == 0) && |
|
(rt->fld.flowidn_mark == skb->mark) && |
|
(rt->fld.flowidn_iif == cb->iif)) { |
|
dst_hold_and_use(&rt->dst, jiffies); |
|
rcu_read_unlock(); |
|
skb_dst_set(skb, (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 portid, u32 seq, |
|
int event, int nowait, unsigned int flags) |
|
{ |
|
struct dn_route *rt = (struct dn_route *)skb_dst(skb); |
|
struct rtmsg *r; |
|
struct nlmsghdr *nlh; |
|
long expires; |
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags); |
|
if (!nlh) |
|
return -EMSGSIZE; |
|
|
|
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; |
|
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; |
|
|
|
if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 || |
|
nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0) |
|
goto errout; |
|
|
|
if (rt->fld.saddr) { |
|
r->rtm_src_len = 16; |
|
if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0) |
|
goto errout; |
|
} |
|
if (rt->dst.dev && |
|
nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0) |
|
goto errout; |
|
|
|
/* |
|
* Note to self - change this if input routes reverse direction when |
|
* they deal only with inputs and not with replies like they do |
|
* currently. |
|
*/ |
|
if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0) |
|
goto errout; |
|
|
|
if (rt->rt_daddr != rt->rt_gateway && |
|
nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0) |
|
goto errout; |
|
|
|
if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
|
goto errout; |
|
|
|
expires = rt->dst.expires ? rt->dst.expires - jiffies : 0; |
|
if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, |
|
rt->dst.error) < 0) |
|
goto errout; |
|
|
|
if (dn_is_input_route(rt) && |
|
nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0) |
|
goto errout; |
|
|
|
nlmsg_end(skb, nlh); |
|
return 0; |
|
|
|
errout: |
|
nlmsg_cancel(skb, nlh); |
|
return -EMSGSIZE; |
|
} |
|
|
|
const struct nla_policy rtm_dn_policy[RTA_MAX + 1] = { |
|
[RTA_DST] = { .type = NLA_U16 }, |
|
[RTA_SRC] = { .type = NLA_U16 }, |
|
[RTA_IIF] = { .type = NLA_U32 }, |
|
[RTA_OIF] = { .type = NLA_U32 }, |
|
[RTA_GATEWAY] = { .type = NLA_U16 }, |
|
[RTA_PRIORITY] = { .type = NLA_U32 }, |
|
[RTA_PREFSRC] = { .type = NLA_U16 }, |
|
[RTA_METRICS] = { .type = NLA_NESTED }, |
|
[RTA_MULTIPATH] = { .type = NLA_NESTED }, |
|
[RTA_TABLE] = { .type = NLA_U32 }, |
|
[RTA_MARK] = { .type = NLA_U32 }, |
|
}; |
|
|
|
/* |
|
* This is called by both endnodes and routers now. |
|
*/ |
|
static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(in_skb->sk); |
|
struct rtmsg *rtm = nlmsg_data(nlh); |
|
struct dn_route *rt = NULL; |
|
struct dn_skb_cb *cb; |
|
int err; |
|
struct sk_buff *skb; |
|
struct flowidn fld; |
|
struct nlattr *tb[RTA_MAX+1]; |
|
|
|
if (!net_eq(net, &init_net)) |
|
return -EINVAL; |
|
|
|
err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
|
rtm_dn_policy, extack); |
|
if (err < 0) |
|
return err; |
|
|
|
memset(&fld, 0, sizeof(fld)); |
|
fld.flowidn_proto = DNPROTO_NSP; |
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
|
if (skb == NULL) |
|
return -ENOBUFS; |
|
skb_reset_mac_header(skb); |
|
cb = DN_SKB_CB(skb); |
|
|
|
if (tb[RTA_SRC]) |
|
fld.saddr = nla_get_le16(tb[RTA_SRC]); |
|
|
|
if (tb[RTA_DST]) |
|
fld.daddr = nla_get_le16(tb[RTA_DST]); |
|
|
|
if (tb[RTA_IIF]) |
|
fld.flowidn_iif = nla_get_u32(tb[RTA_IIF]); |
|
|
|
if (fld.flowidn_iif) { |
|
struct net_device *dev; |
|
dev = __dev_get_by_index(&init_net, fld.flowidn_iif); |
|
if (!dev || !dev->dn_ptr) { |
|
kfree_skb(skb); |
|
return -ENODEV; |
|
} |
|
skb->protocol = htons(ETH_P_DNA_RT); |
|
skb->dev = dev; |
|
cb->src = fld.saddr; |
|
cb->dst = fld.daddr; |
|
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(skb); |
|
if (!err && -rt->dst.error) |
|
err = rt->dst.error; |
|
} else { |
|
if (tb[RTA_OIF]) |
|
fld.flowidn_oif = nla_get_u32(tb[RTA_OIF]); |
|
|
|
err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0); |
|
} |
|
|
|
skb->dev = NULL; |
|
if (err) |
|
goto out_free; |
|
skb_dst_set(skb, &rt->dst); |
|
if (rtm->rtm_flags & RTM_F_NOTIFY) |
|
rt->rt_flags |= RTCF_NOTIFY; |
|
|
|
err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
|
if (err < 0) { |
|
err = -EMSGSIZE; |
|
goto out_free; |
|
} |
|
|
|
return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).portid); |
|
|
|
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 = sock_net(skb->sk); |
|
struct dn_route *rt; |
|
int h, s_h; |
|
int idx, s_idx; |
|
struct rtmsg *rtm; |
|
|
|
if (!net_eq(net, &init_net)) |
|
return 0; |
|
|
|
if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg)) |
|
return -EINVAL; |
|
|
|
rtm = nlmsg_data(cb->nlh); |
|
if (!(rtm->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_bh(dn_rt_hash_table[h].chain), idx = 0; |
|
rt; |
|
rt = rcu_dereference_bh(rt->dn_next), idx++) { |
|
if (idx < s_idx) |
|
continue; |
|
skb_dst_set(skb, dst_clone(&rt->dst)); |
|
if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).portid, |
|
cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
|
1, NLM_F_MULTI) < 0) { |
|
skb_dst_drop(skb); |
|
rcu_read_unlock_bh(); |
|
goto done; |
|
} |
|
skb_dst_drop(skb); |
|
} |
|
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 = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
|
if (rt) |
|
break; |
|
rcu_read_unlock_bh(); |
|
} |
|
return 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 = rcu_dereference_bh(rt->dn_next); |
|
while (!rt) { |
|
rcu_read_unlock_bh(); |
|
if (--s->bucket < 0) |
|
break; |
|
rcu_read_lock_bh(); |
|
rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
|
} |
|
return 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->dst.dev ? rt->dst.dev->name : "*", |
|
dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1), |
|
dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2), |
|
atomic_read(&rt->dst.__refcnt), |
|
rt->dst.__use, 0); |
|
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, |
|
}; |
|
#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); |
|
dst_entries_init(&dn_dst_ops); |
|
timer_setup(&dn_route_timer, dn_dst_check_expire, 0); |
|
dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
|
add_timer(&dn_route_timer); |
|
|
|
goal = totalram_pages() >> (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_create_seq_private("decnet_cache", 0444, init_net.proc_net, |
|
&dn_rt_cache_seq_ops, |
|
sizeof(struct dn_rt_cache_iter_state), NULL); |
|
|
|
#ifdef CONFIG_DECNET_ROUTER |
|
rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE, |
|
dn_cache_getroute, dn_fib_dump, 0); |
|
#else |
|
rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE, |
|
dn_cache_getroute, dn_cache_dump, 0); |
|
#endif |
|
} |
|
|
|
void __exit dn_route_cleanup(void) |
|
{ |
|
del_timer(&dn_route_timer); |
|
dn_run_flush(NULL); |
|
|
|
remove_proc_entry("decnet_cache", init_net.proc_net); |
|
dst_entries_destroy(&dn_dst_ops); |
|
}
|
|
|