forked from luck/tmp_suning_uos_patched
6205120044
On lockdep we have a quite big spinlock_t, so keep the size down. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
3207 lines
78 KiB
C
3207 lines
78 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET 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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* ROUTE - implementation of the IP router.
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*
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* Version: $Id: route.c,v 1.103 2002/01/12 07:44:09 davem Exp $
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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* Linus Torvalds, <Linus.Torvalds@helsinki.fi>
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* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Fixes:
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* Alan Cox : Verify area fixes.
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* Alan Cox : cli() protects routing changes
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* Rui Oliveira : ICMP routing table updates
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* (rco@di.uminho.pt) Routing table insertion and update
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* Linus Torvalds : Rewrote bits to be sensible
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* Alan Cox : Added BSD route gw semantics
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* Alan Cox : Super /proc >4K
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* Alan Cox : MTU in route table
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* Alan Cox : MSS actually. Also added the window
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* clamper.
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* Sam Lantinga : Fixed route matching in rt_del()
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* Alan Cox : Routing cache support.
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* Alan Cox : Removed compatibility cruft.
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* Alan Cox : RTF_REJECT support.
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* Alan Cox : TCP irtt support.
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* Jonathan Naylor : Added Metric support.
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* Miquel van Smoorenburg : BSD API fixes.
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* Miquel van Smoorenburg : Metrics.
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* Alan Cox : Use __u32 properly
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* Alan Cox : Aligned routing errors more closely with BSD
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* our system is still very different.
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* Alan Cox : Faster /proc handling
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* Alexey Kuznetsov : Massive rework to support tree based routing,
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* routing caches and better behaviour.
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*
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* Olaf Erb : irtt wasn't being copied right.
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* Bjorn Ekwall : Kerneld route support.
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* Alan Cox : Multicast fixed (I hope)
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* Pavel Krauz : Limited broadcast fixed
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* Mike McLagan : Routing by source
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* Alexey Kuznetsov : End of old history. Split to fib.c and
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* route.c and rewritten from scratch.
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* Andi Kleen : Load-limit warning messages.
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* Vitaly E. Lavrov : Transparent proxy revived after year coma.
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* Vitaly E. Lavrov : Race condition in ip_route_input_slow.
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* Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow.
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* Vladimir V. Ivanov : IP rule info (flowid) is really useful.
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* Marc Boucher : routing by fwmark
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* Robert Olsson : Added rt_cache statistics
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* Arnaldo C. Melo : Convert proc stuff to seq_file
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* Eric Dumazet : hashed spinlocks and rt_check_expire() fixes.
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* Ilia Sotnikov : Ignore TOS on PMTUD and Redirect
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* Ilia Sotnikov : Removed TOS from hash calculations
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/errno.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/inetdevice.h>
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#include <linux/igmp.h>
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#include <linux/pkt_sched.h>
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#include <linux/mroute.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/random.h>
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#include <linux/jhash.h>
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#include <linux/rcupdate.h>
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#include <linux/times.h>
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#include <net/protocol.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/inetpeer.h>
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#include <net/sock.h>
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#include <net/ip_fib.h>
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#include <net/arp.h>
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#include <net/tcp.h>
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#include <net/icmp.h>
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#include <net/xfrm.h>
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#include <net/ip_mp_alg.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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#endif
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#define RT_FL_TOS(oldflp) \
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((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK)))
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#define IP_MAX_MTU 0xFFF0
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#define RT_GC_TIMEOUT (300*HZ)
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static int ip_rt_min_delay = 2 * HZ;
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static int ip_rt_max_delay = 10 * HZ;
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static int ip_rt_max_size;
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static int ip_rt_gc_timeout = RT_GC_TIMEOUT;
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static int ip_rt_gc_interval = 60 * HZ;
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static int ip_rt_gc_min_interval = HZ / 2;
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static int ip_rt_redirect_number = 9;
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static int ip_rt_redirect_load = HZ / 50;
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static int ip_rt_redirect_silence = ((HZ / 50) << (9 + 1));
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static int ip_rt_error_cost = HZ;
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static int ip_rt_error_burst = 5 * HZ;
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static int ip_rt_gc_elasticity = 8;
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static int ip_rt_mtu_expires = 10 * 60 * HZ;
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static int ip_rt_min_pmtu = 512 + 20 + 20;
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static int ip_rt_min_advmss = 256;
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static int ip_rt_secret_interval = 10 * 60 * HZ;
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static unsigned long rt_deadline;
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#define RTprint(a...) printk(KERN_DEBUG a)
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static struct timer_list rt_flush_timer;
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static struct timer_list rt_periodic_timer;
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static struct timer_list rt_secret_timer;
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/*
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* Interface to generic destination cache.
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*/
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static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie);
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static void ipv4_dst_destroy(struct dst_entry *dst);
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static void ipv4_dst_ifdown(struct dst_entry *dst,
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struct net_device *dev, int how);
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static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst);
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static void ipv4_link_failure(struct sk_buff *skb);
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static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
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static int rt_garbage_collect(void);
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static struct dst_ops ipv4_dst_ops = {
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.family = AF_INET,
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.protocol = __constant_htons(ETH_P_IP),
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.gc = rt_garbage_collect,
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.check = ipv4_dst_check,
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.destroy = ipv4_dst_destroy,
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.ifdown = ipv4_dst_ifdown,
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.negative_advice = ipv4_negative_advice,
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.link_failure = ipv4_link_failure,
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.update_pmtu = ip_rt_update_pmtu,
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.entry_size = sizeof(struct rtable),
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};
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#define ECN_OR_COST(class) TC_PRIO_##class
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__u8 ip_tos2prio[16] = {
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TC_PRIO_BESTEFFORT,
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ECN_OR_COST(FILLER),
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TC_PRIO_BESTEFFORT,
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ECN_OR_COST(BESTEFFORT),
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TC_PRIO_BULK,
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ECN_OR_COST(BULK),
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TC_PRIO_BULK,
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ECN_OR_COST(BULK),
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TC_PRIO_INTERACTIVE,
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ECN_OR_COST(INTERACTIVE),
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TC_PRIO_INTERACTIVE,
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ECN_OR_COST(INTERACTIVE),
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TC_PRIO_INTERACTIVE_BULK,
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ECN_OR_COST(INTERACTIVE_BULK),
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TC_PRIO_INTERACTIVE_BULK,
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ECN_OR_COST(INTERACTIVE_BULK)
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};
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/*
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* Route cache.
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*/
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/* The locking scheme is rather straight forward:
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*
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* 1) Read-Copy Update protects the buckets of the central route hash.
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* 2) Only writers remove entries, and they hold the lock
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* as they look at rtable reference counts.
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* 3) Only readers acquire references to rtable entries,
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* they do so with atomic increments and with the
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* lock held.
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*/
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struct rt_hash_bucket {
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struct rtable *chain;
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};
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#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \
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defined(CONFIG_PROVE_LOCKING)
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/*
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* Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks
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* The size of this table is a power of two and depends on the number of CPUS.
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* (on lockdep we have a quite big spinlock_t, so keep the size down there)
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*/
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#ifdef CONFIG_LOCKDEP
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# define RT_HASH_LOCK_SZ 256
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#else
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# if NR_CPUS >= 32
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# define RT_HASH_LOCK_SZ 4096
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# elif NR_CPUS >= 16
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# define RT_HASH_LOCK_SZ 2048
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# elif NR_CPUS >= 8
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# define RT_HASH_LOCK_SZ 1024
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# elif NR_CPUS >= 4
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# define RT_HASH_LOCK_SZ 512
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# else
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# define RT_HASH_LOCK_SZ 256
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# endif
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#endif
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static spinlock_t *rt_hash_locks;
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# define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)]
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# define rt_hash_lock_init() { \
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int i; \
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rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, GFP_KERNEL); \
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if (!rt_hash_locks) panic("IP: failed to allocate rt_hash_locks\n"); \
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for (i = 0; i < RT_HASH_LOCK_SZ; i++) \
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spin_lock_init(&rt_hash_locks[i]); \
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}
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#else
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# define rt_hash_lock_addr(slot) NULL
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# define rt_hash_lock_init()
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#endif
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static struct rt_hash_bucket *rt_hash_table;
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static unsigned rt_hash_mask;
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static int rt_hash_log;
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static unsigned int rt_hash_rnd;
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static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
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#define RT_CACHE_STAT_INC(field) \
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(__raw_get_cpu_var(rt_cache_stat).field++)
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static int rt_intern_hash(unsigned hash, struct rtable *rth,
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struct rtable **res);
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static unsigned int rt_hash_code(u32 daddr, u32 saddr)
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{
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return (jhash_2words(daddr, saddr, rt_hash_rnd)
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& rt_hash_mask);
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}
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#ifdef CONFIG_PROC_FS
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struct rt_cache_iter_state {
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int bucket;
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};
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static struct rtable *rt_cache_get_first(struct seq_file *seq)
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{
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struct rtable *r = NULL;
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struct rt_cache_iter_state *st = seq->private;
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for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) {
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rcu_read_lock_bh();
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r = rt_hash_table[st->bucket].chain;
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if (r)
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break;
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rcu_read_unlock_bh();
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}
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return r;
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}
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static struct rtable *rt_cache_get_next(struct seq_file *seq, struct rtable *r)
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{
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struct rt_cache_iter_state *st = rcu_dereference(seq->private);
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r = r->u.rt_next;
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while (!r) {
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rcu_read_unlock_bh();
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if (--st->bucket < 0)
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break;
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rcu_read_lock_bh();
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r = rt_hash_table[st->bucket].chain;
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}
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return r;
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}
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static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos)
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{
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struct rtable *r = rt_cache_get_first(seq);
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if (r)
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while (pos && (r = rt_cache_get_next(seq, r)))
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--pos;
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return pos ? NULL : r;
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}
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|
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static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
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{
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return *pos ? rt_cache_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
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}
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static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct rtable *r = NULL;
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if (v == SEQ_START_TOKEN)
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r = rt_cache_get_first(seq);
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else
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r = rt_cache_get_next(seq, v);
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++*pos;
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return r;
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}
|
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static void rt_cache_seq_stop(struct seq_file *seq, void *v)
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{
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if (v && v != SEQ_START_TOKEN)
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rcu_read_unlock_bh();
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}
|
|
|
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static int rt_cache_seq_show(struct seq_file *seq, void *v)
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{
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if (v == SEQ_START_TOKEN)
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seq_printf(seq, "%-127s\n",
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"Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t"
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"Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t"
|
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"HHUptod\tSpecDst");
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else {
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struct rtable *r = v;
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char temp[256];
|
|
|
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sprintf(temp, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t"
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"%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X",
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r->u.dst.dev ? r->u.dst.dev->name : "*",
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(unsigned long)r->rt_dst, (unsigned long)r->rt_gateway,
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r->rt_flags, atomic_read(&r->u.dst.__refcnt),
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r->u.dst.__use, 0, (unsigned long)r->rt_src,
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(dst_metric(&r->u.dst, RTAX_ADVMSS) ?
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(int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0),
|
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dst_metric(&r->u.dst, RTAX_WINDOW),
|
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(int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) +
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dst_metric(&r->u.dst, RTAX_RTTVAR)),
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r->fl.fl4_tos,
|
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r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1,
|
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r->u.dst.hh ? (r->u.dst.hh->hh_output ==
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dev_queue_xmit) : 0,
|
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r->rt_spec_dst);
|
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seq_printf(seq, "%-127s\n", temp);
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}
|
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return 0;
|
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}
|
|
|
|
static struct seq_operations rt_cache_seq_ops = {
|
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.start = rt_cache_seq_start,
|
|
.next = rt_cache_seq_next,
|
|
.stop = rt_cache_seq_stop,
|
|
.show = rt_cache_seq_show,
|
|
};
|
|
|
|
static int rt_cache_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq;
|
|
int rc = -ENOMEM;
|
|
struct rt_cache_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
|
|
|
|
if (!s)
|
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goto out;
|
|
rc = seq_open(file, &rt_cache_seq_ops);
|
|
if (rc)
|
|
goto out_kfree;
|
|
seq = file->private_data;
|
|
seq->private = s;
|
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memset(s, 0, sizeof(*s));
|
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out:
|
|
return rc;
|
|
out_kfree:
|
|
kfree(s);
|
|
goto out;
|
|
}
|
|
|
|
static struct file_operations rt_cache_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rt_cache_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
};
|
|
|
|
|
|
static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
int cpu;
|
|
|
|
if (*pos == 0)
|
|
return SEQ_START_TOKEN;
|
|
|
|
for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
|
|
if (!cpu_possible(cpu))
|
|
continue;
|
|
*pos = cpu+1;
|
|
return &per_cpu(rt_cache_stat, cpu);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
int cpu;
|
|
|
|
for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
|
|
if (!cpu_possible(cpu))
|
|
continue;
|
|
*pos = cpu+1;
|
|
return &per_cpu(rt_cache_stat, cpu);
|
|
}
|
|
return NULL;
|
|
|
|
}
|
|
|
|
static void rt_cpu_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
|
|
}
|
|
|
|
static int rt_cpu_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct rt_cache_stat *st = v;
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_printf(seq, "entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n");
|
|
return 0;
|
|
}
|
|
|
|
seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x "
|
|
" %08x %08x %08x %08x %08x %08x %08x %08x %08x \n",
|
|
atomic_read(&ipv4_dst_ops.entries),
|
|
st->in_hit,
|
|
st->in_slow_tot,
|
|
st->in_slow_mc,
|
|
st->in_no_route,
|
|
st->in_brd,
|
|
st->in_martian_dst,
|
|
st->in_martian_src,
|
|
|
|
st->out_hit,
|
|
st->out_slow_tot,
|
|
st->out_slow_mc,
|
|
|
|
st->gc_total,
|
|
st->gc_ignored,
|
|
st->gc_goal_miss,
|
|
st->gc_dst_overflow,
|
|
st->in_hlist_search,
|
|
st->out_hlist_search
|
|
);
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations rt_cpu_seq_ops = {
|
|
.start = rt_cpu_seq_start,
|
|
.next = rt_cpu_seq_next,
|
|
.stop = rt_cpu_seq_stop,
|
|
.show = rt_cpu_seq_show,
|
|
};
|
|
|
|
|
|
static int rt_cpu_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &rt_cpu_seq_ops);
|
|
}
|
|
|
|
static struct file_operations rt_cpu_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rt_cpu_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
static __inline__ void rt_free(struct rtable *rt)
|
|
{
|
|
multipath_remove(rt);
|
|
call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
|
|
}
|
|
|
|
static __inline__ void rt_drop(struct rtable *rt)
|
|
{
|
|
multipath_remove(rt);
|
|
ip_rt_put(rt);
|
|
call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
|
|
}
|
|
|
|
static __inline__ int rt_fast_clean(struct rtable *rth)
|
|
{
|
|
/* Kill broadcast/multicast entries very aggresively, if they
|
|
collide in hash table with more useful entries */
|
|
return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
|
|
rth->fl.iif && rth->u.rt_next;
|
|
}
|
|
|
|
static __inline__ int rt_valuable(struct rtable *rth)
|
|
{
|
|
return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) ||
|
|
rth->u.dst.expires;
|
|
}
|
|
|
|
static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2)
|
|
{
|
|
unsigned long age;
|
|
int ret = 0;
|
|
|
|
if (atomic_read(&rth->u.dst.__refcnt))
|
|
goto out;
|
|
|
|
ret = 1;
|
|
if (rth->u.dst.expires &&
|
|
time_after_eq(jiffies, rth->u.dst.expires))
|
|
goto out;
|
|
|
|
age = jiffies - rth->u.dst.lastuse;
|
|
ret = 0;
|
|
if ((age <= tmo1 && !rt_fast_clean(rth)) ||
|
|
(age <= tmo2 && rt_valuable(rth)))
|
|
goto out;
|
|
ret = 1;
|
|
out: return ret;
|
|
}
|
|
|
|
/* Bits of score are:
|
|
* 31: very valuable
|
|
* 30: not quite useless
|
|
* 29..0: usage counter
|
|
*/
|
|
static inline u32 rt_score(struct rtable *rt)
|
|
{
|
|
u32 score = jiffies - rt->u.dst.lastuse;
|
|
|
|
score = ~score & ~(3<<30);
|
|
|
|
if (rt_valuable(rt))
|
|
score |= (1<<31);
|
|
|
|
if (!rt->fl.iif ||
|
|
!(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL)))
|
|
score |= (1<<30);
|
|
|
|
return score;
|
|
}
|
|
|
|
static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
|
|
{
|
|
return memcmp(&fl1->nl_u.ip4_u, &fl2->nl_u.ip4_u, sizeof(fl1->nl_u.ip4_u)) == 0 &&
|
|
fl1->oif == fl2->oif &&
|
|
fl1->iif == fl2->iif;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
static struct rtable **rt_remove_balanced_route(struct rtable **chain_head,
|
|
struct rtable *expentry,
|
|
int *removed_count)
|
|
{
|
|
int passedexpired = 0;
|
|
struct rtable **nextstep = NULL;
|
|
struct rtable **rthp = chain_head;
|
|
struct rtable *rth;
|
|
|
|
if (removed_count)
|
|
*removed_count = 0;
|
|
|
|
while ((rth = *rthp) != NULL) {
|
|
if (rth == expentry)
|
|
passedexpired = 1;
|
|
|
|
if (((*rthp)->u.dst.flags & DST_BALANCED) != 0 &&
|
|
compare_keys(&(*rthp)->fl, &expentry->fl)) {
|
|
if (*rthp == expentry) {
|
|
*rthp = rth->u.rt_next;
|
|
continue;
|
|
} else {
|
|
*rthp = rth->u.rt_next;
|
|
rt_free(rth);
|
|
if (removed_count)
|
|
++(*removed_count);
|
|
}
|
|
} else {
|
|
if (!((*rthp)->u.dst.flags & DST_BALANCED) &&
|
|
passedexpired && !nextstep)
|
|
nextstep = &rth->u.rt_next;
|
|
|
|
rthp = &rth->u.rt_next;
|
|
}
|
|
}
|
|
|
|
rt_free(expentry);
|
|
if (removed_count)
|
|
++(*removed_count);
|
|
|
|
return nextstep;
|
|
}
|
|
#endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
|
|
|
|
|
|
/* This runs via a timer and thus is always in BH context. */
|
|
static void rt_check_expire(unsigned long dummy)
|
|
{
|
|
static unsigned int rover;
|
|
unsigned int i = rover, goal;
|
|
struct rtable *rth, **rthp;
|
|
unsigned long now = jiffies;
|
|
u64 mult;
|
|
|
|
mult = ((u64)ip_rt_gc_interval) << rt_hash_log;
|
|
if (ip_rt_gc_timeout > 1)
|
|
do_div(mult, ip_rt_gc_timeout);
|
|
goal = (unsigned int)mult;
|
|
if (goal > rt_hash_mask) goal = rt_hash_mask + 1;
|
|
for (; goal > 0; goal--) {
|
|
unsigned long tmo = ip_rt_gc_timeout;
|
|
|
|
i = (i + 1) & rt_hash_mask;
|
|
rthp = &rt_hash_table[i].chain;
|
|
|
|
if (*rthp == 0)
|
|
continue;
|
|
spin_lock(rt_hash_lock_addr(i));
|
|
while ((rth = *rthp) != NULL) {
|
|
if (rth->u.dst.expires) {
|
|
/* Entry is expired even if it is in use */
|
|
if (time_before_eq(now, rth->u.dst.expires)) {
|
|
tmo >>= 1;
|
|
rthp = &rth->u.rt_next;
|
|
continue;
|
|
}
|
|
} else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) {
|
|
tmo >>= 1;
|
|
rthp = &rth->u.rt_next;
|
|
continue;
|
|
}
|
|
|
|
/* Cleanup aged off entries. */
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
/* remove all related balanced entries if necessary */
|
|
if (rth->u.dst.flags & DST_BALANCED) {
|
|
rthp = rt_remove_balanced_route(
|
|
&rt_hash_table[i].chain,
|
|
rth, NULL);
|
|
if (!rthp)
|
|
break;
|
|
} else {
|
|
*rthp = rth->u.rt_next;
|
|
rt_free(rth);
|
|
}
|
|
#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
|
|
*rthp = rth->u.rt_next;
|
|
rt_free(rth);
|
|
#endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
|
|
}
|
|
spin_unlock(rt_hash_lock_addr(i));
|
|
|
|
/* Fallback loop breaker. */
|
|
if (time_after(jiffies, now))
|
|
break;
|
|
}
|
|
rover = i;
|
|
mod_timer(&rt_periodic_timer, jiffies + ip_rt_gc_interval);
|
|
}
|
|
|
|
/* This can run from both BH and non-BH contexts, the latter
|
|
* in the case of a forced flush event.
|
|
*/
|
|
static void rt_run_flush(unsigned long dummy)
|
|
{
|
|
int i;
|
|
struct rtable *rth, *next;
|
|
|
|
rt_deadline = 0;
|
|
|
|
get_random_bytes(&rt_hash_rnd, 4);
|
|
|
|
for (i = rt_hash_mask; i >= 0; i--) {
|
|
spin_lock_bh(rt_hash_lock_addr(i));
|
|
rth = rt_hash_table[i].chain;
|
|
if (rth)
|
|
rt_hash_table[i].chain = NULL;
|
|
spin_unlock_bh(rt_hash_lock_addr(i));
|
|
|
|
for (; rth; rth = next) {
|
|
next = rth->u.rt_next;
|
|
rt_free(rth);
|
|
}
|
|
}
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(rt_flush_lock);
|
|
|
|
void rt_cache_flush(int delay)
|
|
{
|
|
unsigned long now = jiffies;
|
|
int user_mode = !in_softirq();
|
|
|
|
if (delay < 0)
|
|
delay = ip_rt_min_delay;
|
|
|
|
/* flush existing multipath state*/
|
|
multipath_flush();
|
|
|
|
spin_lock_bh(&rt_flush_lock);
|
|
|
|
if (del_timer(&rt_flush_timer) && delay > 0 && rt_deadline) {
|
|
long tmo = (long)(rt_deadline - now);
|
|
|
|
/* If flush timer is already running
|
|
and flush request is not immediate (delay > 0):
|
|
|
|
if deadline is not achieved, prolongate timer to "delay",
|
|
otherwise fire it at deadline time.
|
|
*/
|
|
|
|
if (user_mode && tmo < ip_rt_max_delay-ip_rt_min_delay)
|
|
tmo = 0;
|
|
|
|
if (delay > tmo)
|
|
delay = tmo;
|
|
}
|
|
|
|
if (delay <= 0) {
|
|
spin_unlock_bh(&rt_flush_lock);
|
|
rt_run_flush(0);
|
|
return;
|
|
}
|
|
|
|
if (rt_deadline == 0)
|
|
rt_deadline = now + ip_rt_max_delay;
|
|
|
|
mod_timer(&rt_flush_timer, now+delay);
|
|
spin_unlock_bh(&rt_flush_lock);
|
|
}
|
|
|
|
static void rt_secret_rebuild(unsigned long dummy)
|
|
{
|
|
unsigned long now = jiffies;
|
|
|
|
rt_cache_flush(0);
|
|
mod_timer(&rt_secret_timer, now + ip_rt_secret_interval);
|
|
}
|
|
|
|
/*
|
|
Short description of GC goals.
|
|
|
|
We want to build algorithm, which will keep routing cache
|
|
at some equilibrium point, when number of aged off entries
|
|
is kept approximately equal to newly generated ones.
|
|
|
|
Current expiration strength is variable "expire".
|
|
We try to adjust it dynamically, so that if networking
|
|
is idle expires is large enough to keep enough of warm entries,
|
|
and when load increases it reduces to limit cache size.
|
|
*/
|
|
|
|
static int rt_garbage_collect(void)
|
|
{
|
|
static unsigned long expire = RT_GC_TIMEOUT;
|
|
static unsigned long last_gc;
|
|
static int rover;
|
|
static int equilibrium;
|
|
struct rtable *rth, **rthp;
|
|
unsigned long now = jiffies;
|
|
int goal;
|
|
|
|
/*
|
|
* Garbage collection is pretty expensive,
|
|
* do not make it too frequently.
|
|
*/
|
|
|
|
RT_CACHE_STAT_INC(gc_total);
|
|
|
|
if (now - last_gc < ip_rt_gc_min_interval &&
|
|
atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) {
|
|
RT_CACHE_STAT_INC(gc_ignored);
|
|
goto out;
|
|
}
|
|
|
|
/* Calculate number of entries, which we want to expire now. */
|
|
goal = atomic_read(&ipv4_dst_ops.entries) -
|
|
(ip_rt_gc_elasticity << rt_hash_log);
|
|
if (goal <= 0) {
|
|
if (equilibrium < ipv4_dst_ops.gc_thresh)
|
|
equilibrium = ipv4_dst_ops.gc_thresh;
|
|
goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium;
|
|
if (goal > 0) {
|
|
equilibrium += min_t(unsigned int, goal / 2, rt_hash_mask + 1);
|
|
goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium;
|
|
}
|
|
} else {
|
|
/* We are in dangerous area. Try to reduce cache really
|
|
* aggressively.
|
|
*/
|
|
goal = max_t(unsigned int, goal / 2, rt_hash_mask + 1);
|
|
equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal;
|
|
}
|
|
|
|
if (now - last_gc >= ip_rt_gc_min_interval)
|
|
last_gc = now;
|
|
|
|
if (goal <= 0) {
|
|
equilibrium += goal;
|
|
goto work_done;
|
|
}
|
|
|
|
do {
|
|
int i, k;
|
|
|
|
for (i = rt_hash_mask, k = rover; i >= 0; i--) {
|
|
unsigned long tmo = expire;
|
|
|
|
k = (k + 1) & rt_hash_mask;
|
|
rthp = &rt_hash_table[k].chain;
|
|
spin_lock_bh(rt_hash_lock_addr(k));
|
|
while ((rth = *rthp) != NULL) {
|
|
if (!rt_may_expire(rth, tmo, expire)) {
|
|
tmo >>= 1;
|
|
rthp = &rth->u.rt_next;
|
|
continue;
|
|
}
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
/* remove all related balanced entries
|
|
* if necessary
|
|
*/
|
|
if (rth->u.dst.flags & DST_BALANCED) {
|
|
int r;
|
|
|
|
rthp = rt_remove_balanced_route(
|
|
&rt_hash_table[k].chain,
|
|
rth,
|
|
&r);
|
|
goal -= r;
|
|
if (!rthp)
|
|
break;
|
|
} else {
|
|
*rthp = rth->u.rt_next;
|
|
rt_free(rth);
|
|
goal--;
|
|
}
|
|
#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
|
|
*rthp = rth->u.rt_next;
|
|
rt_free(rth);
|
|
goal--;
|
|
#endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
|
|
}
|
|
spin_unlock_bh(rt_hash_lock_addr(k));
|
|
if (goal <= 0)
|
|
break;
|
|
}
|
|
rover = k;
|
|
|
|
if (goal <= 0)
|
|
goto work_done;
|
|
|
|
/* Goal is not achieved. We stop process if:
|
|
|
|
- if expire reduced to zero. Otherwise, expire is halfed.
|
|
- if table is not full.
|
|
- if we are called from interrupt.
|
|
- jiffies check is just fallback/debug loop breaker.
|
|
We will not spin here for long time in any case.
|
|
*/
|
|
|
|
RT_CACHE_STAT_INC(gc_goal_miss);
|
|
|
|
if (expire == 0)
|
|
break;
|
|
|
|
expire >>= 1;
|
|
#if RT_CACHE_DEBUG >= 2
|
|
printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire,
|
|
atomic_read(&ipv4_dst_ops.entries), goal, i);
|
|
#endif
|
|
|
|
if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size)
|
|
goto out;
|
|
} while (!in_softirq() && time_before_eq(jiffies, now));
|
|
|
|
if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size)
|
|
goto out;
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING "dst cache overflow\n");
|
|
RT_CACHE_STAT_INC(gc_dst_overflow);
|
|
return 1;
|
|
|
|
work_done:
|
|
expire += ip_rt_gc_min_interval;
|
|
if (expire > ip_rt_gc_timeout ||
|
|
atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh)
|
|
expire = ip_rt_gc_timeout;
|
|
#if RT_CACHE_DEBUG >= 2
|
|
printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire,
|
|
atomic_read(&ipv4_dst_ops.entries), goal, rover);
|
|
#endif
|
|
out: return 0;
|
|
}
|
|
|
|
static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp)
|
|
{
|
|
struct rtable *rth, **rthp;
|
|
unsigned long now;
|
|
struct rtable *cand, **candp;
|
|
u32 min_score;
|
|
int chain_length;
|
|
int attempts = !in_softirq();
|
|
|
|
restart:
|
|
chain_length = 0;
|
|
min_score = ~(u32)0;
|
|
cand = NULL;
|
|
candp = NULL;
|
|
now = jiffies;
|
|
|
|
rthp = &rt_hash_table[hash].chain;
|
|
|
|
spin_lock_bh(rt_hash_lock_addr(hash));
|
|
while ((rth = *rthp) != NULL) {
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
if (!(rth->u.dst.flags & DST_BALANCED) &&
|
|
compare_keys(&rth->fl, &rt->fl)) {
|
|
#else
|
|
if (compare_keys(&rth->fl, &rt->fl)) {
|
|
#endif
|
|
/* Put it first */
|
|
*rthp = rth->u.rt_next;
|
|
/*
|
|
* Since lookup is lockfree, the deletion
|
|
* must be visible to another weakly ordered CPU before
|
|
* the insertion at the start of the hash chain.
|
|
*/
|
|
rcu_assign_pointer(rth->u.rt_next,
|
|
rt_hash_table[hash].chain);
|
|
/*
|
|
* Since lookup is lockfree, the update writes
|
|
* must be ordered for consistency on SMP.
|
|
*/
|
|
rcu_assign_pointer(rt_hash_table[hash].chain, rth);
|
|
|
|
rth->u.dst.__use++;
|
|
dst_hold(&rth->u.dst);
|
|
rth->u.dst.lastuse = now;
|
|
spin_unlock_bh(rt_hash_lock_addr(hash));
|
|
|
|
rt_drop(rt);
|
|
*rp = rth;
|
|
return 0;
|
|
}
|
|
|
|
if (!atomic_read(&rth->u.dst.__refcnt)) {
|
|
u32 score = rt_score(rth);
|
|
|
|
if (score <= min_score) {
|
|
cand = rth;
|
|
candp = rthp;
|
|
min_score = score;
|
|
}
|
|
}
|
|
|
|
chain_length++;
|
|
|
|
rthp = &rth->u.rt_next;
|
|
}
|
|
|
|
if (cand) {
|
|
/* ip_rt_gc_elasticity used to be average length of chain
|
|
* length, when exceeded gc becomes really aggressive.
|
|
*
|
|
* The second limit is less certain. At the moment it allows
|
|
* only 2 entries per bucket. We will see.
|
|
*/
|
|
if (chain_length > ip_rt_gc_elasticity) {
|
|
*candp = cand->u.rt_next;
|
|
rt_free(cand);
|
|
}
|
|
}
|
|
|
|
/* Try to bind route to arp only if it is output
|
|
route or unicast forwarding path.
|
|
*/
|
|
if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) {
|
|
int err = arp_bind_neighbour(&rt->u.dst);
|
|
if (err) {
|
|
spin_unlock_bh(rt_hash_lock_addr(hash));
|
|
|
|
if (err != -ENOBUFS) {
|
|
rt_drop(rt);
|
|
return err;
|
|
}
|
|
|
|
/* Neighbour tables are full and nothing
|
|
can be released. Try to shrink route cache,
|
|
it is most likely it holds some neighbour records.
|
|
*/
|
|
if (attempts-- > 0) {
|
|
int saved_elasticity = ip_rt_gc_elasticity;
|
|
int saved_int = ip_rt_gc_min_interval;
|
|
ip_rt_gc_elasticity = 1;
|
|
ip_rt_gc_min_interval = 0;
|
|
rt_garbage_collect();
|
|
ip_rt_gc_min_interval = saved_int;
|
|
ip_rt_gc_elasticity = saved_elasticity;
|
|
goto restart;
|
|
}
|
|
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING "Neighbour table overflow.\n");
|
|
rt_drop(rt);
|
|
return -ENOBUFS;
|
|
}
|
|
}
|
|
|
|
rt->u.rt_next = rt_hash_table[hash].chain;
|
|
#if RT_CACHE_DEBUG >= 2
|
|
if (rt->u.rt_next) {
|
|
struct rtable *trt;
|
|
printk(KERN_DEBUG "rt_cache @%02x: %u.%u.%u.%u", hash,
|
|
NIPQUAD(rt->rt_dst));
|
|
for (trt = rt->u.rt_next; trt; trt = trt->u.rt_next)
|
|
printk(" . %u.%u.%u.%u", NIPQUAD(trt->rt_dst));
|
|
printk("\n");
|
|
}
|
|
#endif
|
|
rt_hash_table[hash].chain = rt;
|
|
spin_unlock_bh(rt_hash_lock_addr(hash));
|
|
*rp = rt;
|
|
return 0;
|
|
}
|
|
|
|
void rt_bind_peer(struct rtable *rt, int create)
|
|
{
|
|
static DEFINE_SPINLOCK(rt_peer_lock);
|
|
struct inet_peer *peer;
|
|
|
|
peer = inet_getpeer(rt->rt_dst, create);
|
|
|
|
spin_lock_bh(&rt_peer_lock);
|
|
if (rt->peer == NULL) {
|
|
rt->peer = peer;
|
|
peer = NULL;
|
|
}
|
|
spin_unlock_bh(&rt_peer_lock);
|
|
if (peer)
|
|
inet_putpeer(peer);
|
|
}
|
|
|
|
/*
|
|
* Peer allocation may fail only in serious out-of-memory conditions. However
|
|
* we still can generate some output.
|
|
* Random ID selection looks a bit dangerous because we have no chances to
|
|
* select ID being unique in a reasonable period of time.
|
|
* But broken packet identifier may be better than no packet at all.
|
|
*/
|
|
static void ip_select_fb_ident(struct iphdr *iph)
|
|
{
|
|
static DEFINE_SPINLOCK(ip_fb_id_lock);
|
|
static u32 ip_fallback_id;
|
|
u32 salt;
|
|
|
|
spin_lock_bh(&ip_fb_id_lock);
|
|
salt = secure_ip_id(ip_fallback_id ^ iph->daddr);
|
|
iph->id = htons(salt & 0xFFFF);
|
|
ip_fallback_id = salt;
|
|
spin_unlock_bh(&ip_fb_id_lock);
|
|
}
|
|
|
|
void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more)
|
|
{
|
|
struct rtable *rt = (struct rtable *) dst;
|
|
|
|
if (rt) {
|
|
if (rt->peer == NULL)
|
|
rt_bind_peer(rt, 1);
|
|
|
|
/* If peer is attached to destination, it is never detached,
|
|
so that we need not to grab a lock to dereference it.
|
|
*/
|
|
if (rt->peer) {
|
|
iph->id = htons(inet_getid(rt->peer, more));
|
|
return;
|
|
}
|
|
} else
|
|
printk(KERN_DEBUG "rt_bind_peer(0) @%p\n",
|
|
__builtin_return_address(0));
|
|
|
|
ip_select_fb_ident(iph);
|
|
}
|
|
|
|
static void rt_del(unsigned hash, struct rtable *rt)
|
|
{
|
|
struct rtable **rthp;
|
|
|
|
spin_lock_bh(rt_hash_lock_addr(hash));
|
|
ip_rt_put(rt);
|
|
for (rthp = &rt_hash_table[hash].chain; *rthp;
|
|
rthp = &(*rthp)->u.rt_next)
|
|
if (*rthp == rt) {
|
|
*rthp = rt->u.rt_next;
|
|
rt_free(rt);
|
|
break;
|
|
}
|
|
spin_unlock_bh(rt_hash_lock_addr(hash));
|
|
}
|
|
|
|
void ip_rt_redirect(u32 old_gw, u32 daddr, u32 new_gw,
|
|
u32 saddr, struct net_device *dev)
|
|
{
|
|
int i, k;
|
|
struct in_device *in_dev = in_dev_get(dev);
|
|
struct rtable *rth, **rthp;
|
|
u32 skeys[2] = { saddr, 0 };
|
|
int ikeys[2] = { dev->ifindex, 0 };
|
|
|
|
if (!in_dev)
|
|
return;
|
|
|
|
if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev)
|
|
|| MULTICAST(new_gw) || BADCLASS(new_gw) || ZERONET(new_gw))
|
|
goto reject_redirect;
|
|
|
|
if (!IN_DEV_SHARED_MEDIA(in_dev)) {
|
|
if (!inet_addr_onlink(in_dev, new_gw, old_gw))
|
|
goto reject_redirect;
|
|
if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev))
|
|
goto reject_redirect;
|
|
} else {
|
|
if (inet_addr_type(new_gw) != RTN_UNICAST)
|
|
goto reject_redirect;
|
|
}
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
for (k = 0; k < 2; k++) {
|
|
unsigned hash = rt_hash_code(daddr,
|
|
skeys[i] ^ (ikeys[k] << 5));
|
|
|
|
rthp=&rt_hash_table[hash].chain;
|
|
|
|
rcu_read_lock();
|
|
while ((rth = rcu_dereference(*rthp)) != NULL) {
|
|
struct rtable *rt;
|
|
|
|
if (rth->fl.fl4_dst != daddr ||
|
|
rth->fl.fl4_src != skeys[i] ||
|
|
rth->fl.oif != ikeys[k] ||
|
|
rth->fl.iif != 0) {
|
|
rthp = &rth->u.rt_next;
|
|
continue;
|
|
}
|
|
|
|
if (rth->rt_dst != daddr ||
|
|
rth->rt_src != saddr ||
|
|
rth->u.dst.error ||
|
|
rth->rt_gateway != old_gw ||
|
|
rth->u.dst.dev != dev)
|
|
break;
|
|
|
|
dst_hold(&rth->u.dst);
|
|
rcu_read_unlock();
|
|
|
|
rt = dst_alloc(&ipv4_dst_ops);
|
|
if (rt == NULL) {
|
|
ip_rt_put(rth);
|
|
in_dev_put(in_dev);
|
|
return;
|
|
}
|
|
|
|
/* Copy all the information. */
|
|
*rt = *rth;
|
|
INIT_RCU_HEAD(&rt->u.dst.rcu_head);
|
|
rt->u.dst.__use = 1;
|
|
atomic_set(&rt->u.dst.__refcnt, 1);
|
|
rt->u.dst.child = NULL;
|
|
if (rt->u.dst.dev)
|
|
dev_hold(rt->u.dst.dev);
|
|
if (rt->idev)
|
|
in_dev_hold(rt->idev);
|
|
rt->u.dst.obsolete = 0;
|
|
rt->u.dst.lastuse = jiffies;
|
|
rt->u.dst.path = &rt->u.dst;
|
|
rt->u.dst.neighbour = NULL;
|
|
rt->u.dst.hh = NULL;
|
|
rt->u.dst.xfrm = NULL;
|
|
|
|
rt->rt_flags |= RTCF_REDIRECTED;
|
|
|
|
/* Gateway is different ... */
|
|
rt->rt_gateway = new_gw;
|
|
|
|
/* Redirect received -> path was valid */
|
|
dst_confirm(&rth->u.dst);
|
|
|
|
if (rt->peer)
|
|
atomic_inc(&rt->peer->refcnt);
|
|
|
|
if (arp_bind_neighbour(&rt->u.dst) ||
|
|
!(rt->u.dst.neighbour->nud_state &
|
|
NUD_VALID)) {
|
|
if (rt->u.dst.neighbour)
|
|
neigh_event_send(rt->u.dst.neighbour, NULL);
|
|
ip_rt_put(rth);
|
|
rt_drop(rt);
|
|
goto do_next;
|
|
}
|
|
|
|
rt_del(hash, rth);
|
|
if (!rt_intern_hash(hash, rt, &rt))
|
|
ip_rt_put(rt);
|
|
goto do_next;
|
|
}
|
|
rcu_read_unlock();
|
|
do_next:
|
|
;
|
|
}
|
|
}
|
|
in_dev_put(in_dev);
|
|
return;
|
|
|
|
reject_redirect:
|
|
#ifdef CONFIG_IP_ROUTE_VERBOSE
|
|
if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit())
|
|
printk(KERN_INFO "Redirect from %u.%u.%u.%u on %s about "
|
|
"%u.%u.%u.%u ignored.\n"
|
|
" Advised path = %u.%u.%u.%u -> %u.%u.%u.%u\n",
|
|
NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw),
|
|
NIPQUAD(saddr), NIPQUAD(daddr));
|
|
#endif
|
|
in_dev_put(in_dev);
|
|
}
|
|
|
|
static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
|
|
{
|
|
struct rtable *rt = (struct rtable*)dst;
|
|
struct dst_entry *ret = dst;
|
|
|
|
if (rt) {
|
|
if (dst->obsolete) {
|
|
ip_rt_put(rt);
|
|
ret = NULL;
|
|
} else if ((rt->rt_flags & RTCF_REDIRECTED) ||
|
|
rt->u.dst.expires) {
|
|
unsigned hash = rt_hash_code(rt->fl.fl4_dst,
|
|
rt->fl.fl4_src ^
|
|
(rt->fl.oif << 5));
|
|
#if RT_CACHE_DEBUG >= 1
|
|
printk(KERN_DEBUG "ip_rt_advice: redirect to "
|
|
"%u.%u.%u.%u/%02x dropped\n",
|
|
NIPQUAD(rt->rt_dst), rt->fl.fl4_tos);
|
|
#endif
|
|
rt_del(hash, rt);
|
|
ret = NULL;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Algorithm:
|
|
* 1. The first ip_rt_redirect_number redirects are sent
|
|
* with exponential backoff, then we stop sending them at all,
|
|
* assuming that the host ignores our redirects.
|
|
* 2. If we did not see packets requiring redirects
|
|
* during ip_rt_redirect_silence, we assume that the host
|
|
* forgot redirected route and start to send redirects again.
|
|
*
|
|
* This algorithm is much cheaper and more intelligent than dumb load limiting
|
|
* in icmp.c.
|
|
*
|
|
* NOTE. Do not forget to inhibit load limiting for redirects (redundant)
|
|
* and "frag. need" (breaks PMTU discovery) in icmp.c.
|
|
*/
|
|
|
|
void ip_rt_send_redirect(struct sk_buff *skb)
|
|
{
|
|
struct rtable *rt = (struct rtable*)skb->dst;
|
|
struct in_device *in_dev = in_dev_get(rt->u.dst.dev);
|
|
|
|
if (!in_dev)
|
|
return;
|
|
|
|
if (!IN_DEV_TX_REDIRECTS(in_dev))
|
|
goto out;
|
|
|
|
/* No redirected packets during ip_rt_redirect_silence;
|
|
* reset the algorithm.
|
|
*/
|
|
if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence))
|
|
rt->u.dst.rate_tokens = 0;
|
|
|
|
/* Too many ignored redirects; do not send anything
|
|
* set u.dst.rate_last to the last seen redirected packet.
|
|
*/
|
|
if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) {
|
|
rt->u.dst.rate_last = jiffies;
|
|
goto out;
|
|
}
|
|
|
|
/* Check for load limit; set rate_last to the latest sent
|
|
* redirect.
|
|
*/
|
|
if (time_after(jiffies,
|
|
(rt->u.dst.rate_last +
|
|
(ip_rt_redirect_load << rt->u.dst.rate_tokens)))) {
|
|
icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway);
|
|
rt->u.dst.rate_last = jiffies;
|
|
++rt->u.dst.rate_tokens;
|
|
#ifdef CONFIG_IP_ROUTE_VERBOSE
|
|
if (IN_DEV_LOG_MARTIANS(in_dev) &&
|
|
rt->u.dst.rate_tokens == ip_rt_redirect_number &&
|
|
net_ratelimit())
|
|
printk(KERN_WARNING "host %u.%u.%u.%u/if%d ignores "
|
|
"redirects for %u.%u.%u.%u to %u.%u.%u.%u.\n",
|
|
NIPQUAD(rt->rt_src), rt->rt_iif,
|
|
NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway));
|
|
#endif
|
|
}
|
|
out:
|
|
in_dev_put(in_dev);
|
|
}
|
|
|
|
static int ip_error(struct sk_buff *skb)
|
|
{
|
|
struct rtable *rt = (struct rtable*)skb->dst;
|
|
unsigned long now;
|
|
int code;
|
|
|
|
switch (rt->u.dst.error) {
|
|
case EINVAL:
|
|
default:
|
|
goto out;
|
|
case EHOSTUNREACH:
|
|
code = ICMP_HOST_UNREACH;
|
|
break;
|
|
case ENETUNREACH:
|
|
code = ICMP_NET_UNREACH;
|
|
break;
|
|
case EACCES:
|
|
code = ICMP_PKT_FILTERED;
|
|
break;
|
|
}
|
|
|
|
now = jiffies;
|
|
rt->u.dst.rate_tokens += now - rt->u.dst.rate_last;
|
|
if (rt->u.dst.rate_tokens > ip_rt_error_burst)
|
|
rt->u.dst.rate_tokens = ip_rt_error_burst;
|
|
rt->u.dst.rate_last = now;
|
|
if (rt->u.dst.rate_tokens >= ip_rt_error_cost) {
|
|
rt->u.dst.rate_tokens -= ip_rt_error_cost;
|
|
icmp_send(skb, ICMP_DEST_UNREACH, code, 0);
|
|
}
|
|
|
|
out: kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The last two values are not from the RFC but
|
|
* are needed for AMPRnet AX.25 paths.
|
|
*/
|
|
|
|
static const unsigned short mtu_plateau[] =
|
|
{32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 };
|
|
|
|
static __inline__ unsigned short guess_mtu(unsigned short old_mtu)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++)
|
|
if (old_mtu > mtu_plateau[i])
|
|
return mtu_plateau[i];
|
|
return 68;
|
|
}
|
|
|
|
unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu)
|
|
{
|
|
int i;
|
|
unsigned short old_mtu = ntohs(iph->tot_len);
|
|
struct rtable *rth;
|
|
u32 skeys[2] = { iph->saddr, 0, };
|
|
u32 daddr = iph->daddr;
|
|
unsigned short est_mtu = 0;
|
|
|
|
if (ipv4_config.no_pmtu_disc)
|
|
return 0;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
unsigned hash = rt_hash_code(daddr, skeys[i]);
|
|
|
|
rcu_read_lock();
|
|
for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
|
|
rth = rcu_dereference(rth->u.rt_next)) {
|
|
if (rth->fl.fl4_dst == daddr &&
|
|
rth->fl.fl4_src == skeys[i] &&
|
|
rth->rt_dst == daddr &&
|
|
rth->rt_src == iph->saddr &&
|
|
rth->fl.iif == 0 &&
|
|
!(dst_metric_locked(&rth->u.dst, RTAX_MTU))) {
|
|
unsigned short mtu = new_mtu;
|
|
|
|
if (new_mtu < 68 || new_mtu >= old_mtu) {
|
|
|
|
/* BSD 4.2 compatibility hack :-( */
|
|
if (mtu == 0 &&
|
|
old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] &&
|
|
old_mtu >= 68 + (iph->ihl << 2))
|
|
old_mtu -= iph->ihl << 2;
|
|
|
|
mtu = guess_mtu(old_mtu);
|
|
}
|
|
if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) {
|
|
if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) {
|
|
dst_confirm(&rth->u.dst);
|
|
if (mtu < ip_rt_min_pmtu) {
|
|
mtu = ip_rt_min_pmtu;
|
|
rth->u.dst.metrics[RTAX_LOCK-1] |=
|
|
(1 << RTAX_MTU);
|
|
}
|
|
rth->u.dst.metrics[RTAX_MTU-1] = mtu;
|
|
dst_set_expires(&rth->u.dst,
|
|
ip_rt_mtu_expires);
|
|
}
|
|
est_mtu = mtu;
|
|
}
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
return est_mtu ? : new_mtu;
|
|
}
|
|
|
|
static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|
{
|
|
if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 &&
|
|
!(dst_metric_locked(dst, RTAX_MTU))) {
|
|
if (mtu < ip_rt_min_pmtu) {
|
|
mtu = ip_rt_min_pmtu;
|
|
dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU);
|
|
}
|
|
dst->metrics[RTAX_MTU-1] = mtu;
|
|
dst_set_expires(dst, ip_rt_mtu_expires);
|
|
}
|
|
}
|
|
|
|
static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static void ipv4_dst_destroy(struct dst_entry *dst)
|
|
{
|
|
struct rtable *rt = (struct rtable *) dst;
|
|
struct inet_peer *peer = rt->peer;
|
|
struct in_device *idev = rt->idev;
|
|
|
|
if (peer) {
|
|
rt->peer = NULL;
|
|
inet_putpeer(peer);
|
|
}
|
|
|
|
if (idev) {
|
|
rt->idev = NULL;
|
|
in_dev_put(idev);
|
|
}
|
|
}
|
|
|
|
static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
|
|
int how)
|
|
{
|
|
struct rtable *rt = (struct rtable *) dst;
|
|
struct in_device *idev = rt->idev;
|
|
if (dev != &loopback_dev && idev && idev->dev == dev) {
|
|
struct in_device *loopback_idev = in_dev_get(&loopback_dev);
|
|
if (loopback_idev) {
|
|
rt->idev = loopback_idev;
|
|
in_dev_put(idev);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ipv4_link_failure(struct sk_buff *skb)
|
|
{
|
|
struct rtable *rt;
|
|
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
|
|
|
|
rt = (struct rtable *) skb->dst;
|
|
if (rt)
|
|
dst_set_expires(&rt->u.dst, 0);
|
|
}
|
|
|
|
static int ip_rt_bug(struct sk_buff *skb)
|
|
{
|
|
printk(KERN_DEBUG "ip_rt_bug: %u.%u.%u.%u -> %u.%u.%u.%u, %s\n",
|
|
NIPQUAD(skb->nh.iph->saddr), NIPQUAD(skb->nh.iph->daddr),
|
|
skb->dev ? skb->dev->name : "?");
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
We do not cache source address of outgoing interface,
|
|
because it is used only by IP RR, TS and SRR options,
|
|
so that it out of fast path.
|
|
|
|
BTW remember: "addr" is allowed to be not aligned
|
|
in IP options!
|
|
*/
|
|
|
|
void ip_rt_get_source(u8 *addr, struct rtable *rt)
|
|
{
|
|
u32 src;
|
|
struct fib_result res;
|
|
|
|
if (rt->fl.iif == 0)
|
|
src = rt->rt_src;
|
|
else if (fib_lookup(&rt->fl, &res) == 0) {
|
|
src = FIB_RES_PREFSRC(res);
|
|
fib_res_put(&res);
|
|
} else
|
|
src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway,
|
|
RT_SCOPE_UNIVERSE);
|
|
memcpy(addr, &src, 4);
|
|
}
|
|
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
static void set_class_tag(struct rtable *rt, u32 tag)
|
|
{
|
|
if (!(rt->u.dst.tclassid & 0xFFFF))
|
|
rt->u.dst.tclassid |= tag & 0xFFFF;
|
|
if (!(rt->u.dst.tclassid & 0xFFFF0000))
|
|
rt->u.dst.tclassid |= tag & 0xFFFF0000;
|
|
}
|
|
#endif
|
|
|
|
static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag)
|
|
{
|
|
struct fib_info *fi = res->fi;
|
|
|
|
if (fi) {
|
|
if (FIB_RES_GW(*res) &&
|
|
FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
|
|
rt->rt_gateway = FIB_RES_GW(*res);
|
|
memcpy(rt->u.dst.metrics, fi->fib_metrics,
|
|
sizeof(rt->u.dst.metrics));
|
|
if (fi->fib_mtu == 0) {
|
|
rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
|
|
if (rt->u.dst.metrics[RTAX_LOCK-1] & (1 << RTAX_MTU) &&
|
|
rt->rt_gateway != rt->rt_dst &&
|
|
rt->u.dst.dev->mtu > 576)
|
|
rt->u.dst.metrics[RTAX_MTU-1] = 576;
|
|
}
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid;
|
|
#endif
|
|
} else
|
|
rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu;
|
|
|
|
if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
|
|
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl;
|
|
if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU)
|
|
rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU;
|
|
if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0)
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40,
|
|
ip_rt_min_advmss);
|
|
if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40)
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40;
|
|
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
|
set_class_tag(rt, fib_rules_tclass(res));
|
|
#endif
|
|
set_class_tag(rt, itag);
|
|
#endif
|
|
rt->rt_type = res->type;
|
|
}
|
|
|
|
static int ip_route_input_mc(struct sk_buff *skb, u32 daddr, u32 saddr,
|
|
u8 tos, struct net_device *dev, int our)
|
|
{
|
|
unsigned hash;
|
|
struct rtable *rth;
|
|
u32 spec_dst;
|
|
struct in_device *in_dev = in_dev_get(dev);
|
|
u32 itag = 0;
|
|
|
|
/* Primary sanity checks. */
|
|
|
|
if (in_dev == NULL)
|
|
return -EINVAL;
|
|
|
|
if (MULTICAST(saddr) || BADCLASS(saddr) || LOOPBACK(saddr) ||
|
|
skb->protocol != htons(ETH_P_IP))
|
|
goto e_inval;
|
|
|
|
if (ZERONET(saddr)) {
|
|
if (!LOCAL_MCAST(daddr))
|
|
goto e_inval;
|
|
spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
|
|
} else if (fib_validate_source(saddr, 0, tos, 0,
|
|
dev, &spec_dst, &itag) < 0)
|
|
goto e_inval;
|
|
|
|
rth = dst_alloc(&ipv4_dst_ops);
|
|
if (!rth)
|
|
goto e_nobufs;
|
|
|
|
rth->u.dst.output= ip_rt_bug;
|
|
|
|
atomic_set(&rth->u.dst.__refcnt, 1);
|
|
rth->u.dst.flags= DST_HOST;
|
|
if (in_dev->cnf.no_policy)
|
|
rth->u.dst.flags |= DST_NOPOLICY;
|
|
rth->fl.fl4_dst = daddr;
|
|
rth->rt_dst = daddr;
|
|
rth->fl.fl4_tos = tos;
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
rth->fl.fl4_fwmark= skb->nfmark;
|
|
#endif
|
|
rth->fl.fl4_src = saddr;
|
|
rth->rt_src = saddr;
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
rth->u.dst.tclassid = itag;
|
|
#endif
|
|
rth->rt_iif =
|
|
rth->fl.iif = dev->ifindex;
|
|
rth->u.dst.dev = &loopback_dev;
|
|
dev_hold(rth->u.dst.dev);
|
|
rth->idev = in_dev_get(rth->u.dst.dev);
|
|
rth->fl.oif = 0;
|
|
rth->rt_gateway = daddr;
|
|
rth->rt_spec_dst= spec_dst;
|
|
rth->rt_type = RTN_MULTICAST;
|
|
rth->rt_flags = RTCF_MULTICAST;
|
|
if (our) {
|
|
rth->u.dst.input= ip_local_deliver;
|
|
rth->rt_flags |= RTCF_LOCAL;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_MROUTE
|
|
if (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev))
|
|
rth->u.dst.input = ip_mr_input;
|
|
#endif
|
|
RT_CACHE_STAT_INC(in_slow_mc);
|
|
|
|
in_dev_put(in_dev);
|
|
hash = rt_hash_code(daddr, saddr ^ (dev->ifindex << 5));
|
|
return rt_intern_hash(hash, rth, (struct rtable**) &skb->dst);
|
|
|
|
e_nobufs:
|
|
in_dev_put(in_dev);
|
|
return -ENOBUFS;
|
|
|
|
e_inval:
|
|
in_dev_put(in_dev);
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static void ip_handle_martian_source(struct net_device *dev,
|
|
struct in_device *in_dev,
|
|
struct sk_buff *skb,
|
|
u32 daddr,
|
|
u32 saddr)
|
|
{
|
|
RT_CACHE_STAT_INC(in_martian_src);
|
|
#ifdef CONFIG_IP_ROUTE_VERBOSE
|
|
if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) {
|
|
/*
|
|
* RFC1812 recommendation, if source is martian,
|
|
* the only hint is MAC header.
|
|
*/
|
|
printk(KERN_WARNING "martian source %u.%u.%u.%u from "
|
|
"%u.%u.%u.%u, on dev %s\n",
|
|
NIPQUAD(daddr), NIPQUAD(saddr), dev->name);
|
|
if (dev->hard_header_len && skb->mac.raw) {
|
|
int i;
|
|
unsigned char *p = skb->mac.raw;
|
|
printk(KERN_WARNING "ll header: ");
|
|
for (i = 0; i < dev->hard_header_len; i++, p++) {
|
|
printk("%02x", *p);
|
|
if (i < (dev->hard_header_len - 1))
|
|
printk(":");
|
|
}
|
|
printk("\n");
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static inline int __mkroute_input(struct sk_buff *skb,
|
|
struct fib_result* res,
|
|
struct in_device *in_dev,
|
|
u32 daddr, u32 saddr, u32 tos,
|
|
struct rtable **result)
|
|
{
|
|
|
|
struct rtable *rth;
|
|
int err;
|
|
struct in_device *out_dev;
|
|
unsigned flags = 0;
|
|
u32 spec_dst, itag;
|
|
|
|
/* get a working reference to the output device */
|
|
out_dev = in_dev_get(FIB_RES_DEV(*res));
|
|
if (out_dev == NULL) {
|
|
if (net_ratelimit())
|
|
printk(KERN_CRIT "Bug in ip_route_input" \
|
|
"_slow(). Please, report\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res),
|
|
in_dev->dev, &spec_dst, &itag);
|
|
if (err < 0) {
|
|
ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr,
|
|
saddr);
|
|
|
|
err = -EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (err)
|
|
flags |= RTCF_DIRECTSRC;
|
|
|
|
if (out_dev == in_dev && err && !(flags & (RTCF_NAT | RTCF_MASQ)) &&
|
|
(IN_DEV_SHARED_MEDIA(out_dev) ||
|
|
inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res))))
|
|
flags |= RTCF_DOREDIRECT;
|
|
|
|
if (skb->protocol != htons(ETH_P_IP)) {
|
|
/* Not IP (i.e. ARP). Do not create route, if it is
|
|
* invalid for proxy arp. DNAT routes are always valid.
|
|
*/
|
|
if (out_dev == in_dev && !(flags & RTCF_DNAT)) {
|
|
err = -EINVAL;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
|
|
rth = dst_alloc(&ipv4_dst_ops);
|
|
if (!rth) {
|
|
err = -ENOBUFS;
|
|
goto cleanup;
|
|
}
|
|
|
|
atomic_set(&rth->u.dst.__refcnt, 1);
|
|
rth->u.dst.flags= DST_HOST;
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
if (res->fi->fib_nhs > 1)
|
|
rth->u.dst.flags |= DST_BALANCED;
|
|
#endif
|
|
if (in_dev->cnf.no_policy)
|
|
rth->u.dst.flags |= DST_NOPOLICY;
|
|
if (in_dev->cnf.no_xfrm)
|
|
rth->u.dst.flags |= DST_NOXFRM;
|
|
rth->fl.fl4_dst = daddr;
|
|
rth->rt_dst = daddr;
|
|
rth->fl.fl4_tos = tos;
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
rth->fl.fl4_fwmark= skb->nfmark;
|
|
#endif
|
|
rth->fl.fl4_src = saddr;
|
|
rth->rt_src = saddr;
|
|
rth->rt_gateway = daddr;
|
|
rth->rt_iif =
|
|
rth->fl.iif = in_dev->dev->ifindex;
|
|
rth->u.dst.dev = (out_dev)->dev;
|
|
dev_hold(rth->u.dst.dev);
|
|
rth->idev = in_dev_get(rth->u.dst.dev);
|
|
rth->fl.oif = 0;
|
|
rth->rt_spec_dst= spec_dst;
|
|
|
|
rth->u.dst.input = ip_forward;
|
|
rth->u.dst.output = ip_output;
|
|
|
|
rt_set_nexthop(rth, res, itag);
|
|
|
|
rth->rt_flags = flags;
|
|
|
|
*result = rth;
|
|
err = 0;
|
|
cleanup:
|
|
/* release the working reference to the output device */
|
|
in_dev_put(out_dev);
|
|
return err;
|
|
}
|
|
|
|
static inline int ip_mkroute_input_def(struct sk_buff *skb,
|
|
struct fib_result* res,
|
|
const struct flowi *fl,
|
|
struct in_device *in_dev,
|
|
u32 daddr, u32 saddr, u32 tos)
|
|
{
|
|
struct rtable* rth = NULL;
|
|
int err;
|
|
unsigned hash;
|
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0)
|
|
fib_select_multipath(fl, res);
|
|
#endif
|
|
|
|
/* create a routing cache entry */
|
|
err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth);
|
|
if (err)
|
|
return err;
|
|
|
|
/* put it into the cache */
|
|
hash = rt_hash_code(daddr, saddr ^ (fl->iif << 5));
|
|
return rt_intern_hash(hash, rth, (struct rtable**)&skb->dst);
|
|
}
|
|
|
|
static inline int ip_mkroute_input(struct sk_buff *skb,
|
|
struct fib_result* res,
|
|
const struct flowi *fl,
|
|
struct in_device *in_dev,
|
|
u32 daddr, u32 saddr, u32 tos)
|
|
{
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
struct rtable* rth = NULL, *rtres;
|
|
unsigned char hop, hopcount;
|
|
int err = -EINVAL;
|
|
unsigned int hash;
|
|
|
|
if (res->fi)
|
|
hopcount = res->fi->fib_nhs;
|
|
else
|
|
hopcount = 1;
|
|
|
|
/* distinguish between multipath and singlepath */
|
|
if (hopcount < 2)
|
|
return ip_mkroute_input_def(skb, res, fl, in_dev, daddr,
|
|
saddr, tos);
|
|
|
|
/* add all alternatives to the routing cache */
|
|
for (hop = 0; hop < hopcount; hop++) {
|
|
res->nh_sel = hop;
|
|
|
|
/* put reference to previous result */
|
|
if (hop)
|
|
ip_rt_put(rtres);
|
|
|
|
/* create a routing cache entry */
|
|
err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos,
|
|
&rth);
|
|
if (err)
|
|
return err;
|
|
|
|
/* put it into the cache */
|
|
hash = rt_hash_code(daddr, saddr ^ (fl->iif << 5));
|
|
err = rt_intern_hash(hash, rth, &rtres);
|
|
if (err)
|
|
return err;
|
|
|
|
/* forward hop information to multipath impl. */
|
|
multipath_set_nhinfo(rth,
|
|
FIB_RES_NETWORK(*res),
|
|
FIB_RES_NETMASK(*res),
|
|
res->prefixlen,
|
|
&FIB_RES_NH(*res));
|
|
}
|
|
skb->dst = &rtres->u.dst;
|
|
return err;
|
|
#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
|
|
return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos);
|
|
#endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
|
|
}
|
|
|
|
|
|
/*
|
|
* NOTE. We drop all the packets that has local source
|
|
* addresses, because every properly looped back packet
|
|
* must have correct destination already attached by output routine.
|
|
*
|
|
* Such approach solves two big problems:
|
|
* 1. Not simplex devices are handled properly.
|
|
* 2. IP spoofing attempts are filtered with 100% of guarantee.
|
|
*/
|
|
|
|
static int ip_route_input_slow(struct sk_buff *skb, u32 daddr, u32 saddr,
|
|
u8 tos, struct net_device *dev)
|
|
{
|
|
struct fib_result res;
|
|
struct in_device *in_dev = in_dev_get(dev);
|
|
struct flowi fl = { .nl_u = { .ip4_u =
|
|
{ .daddr = daddr,
|
|
.saddr = saddr,
|
|
.tos = tos,
|
|
.scope = RT_SCOPE_UNIVERSE,
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
.fwmark = skb->nfmark
|
|
#endif
|
|
} },
|
|
.iif = dev->ifindex };
|
|
unsigned flags = 0;
|
|
u32 itag = 0;
|
|
struct rtable * rth;
|
|
unsigned hash;
|
|
u32 spec_dst;
|
|
int err = -EINVAL;
|
|
int free_res = 0;
|
|
|
|
/* IP on this device is disabled. */
|
|
|
|
if (!in_dev)
|
|
goto out;
|
|
|
|
/* Check for the most weird martians, which can be not detected
|
|
by fib_lookup.
|
|
*/
|
|
|
|
if (MULTICAST(saddr) || BADCLASS(saddr) || LOOPBACK(saddr))
|
|
goto martian_source;
|
|
|
|
if (daddr == 0xFFFFFFFF || (saddr == 0 && daddr == 0))
|
|
goto brd_input;
|
|
|
|
/* Accept zero addresses only to limited broadcast;
|
|
* I even do not know to fix it or not. Waiting for complains :-)
|
|
*/
|
|
if (ZERONET(saddr))
|
|
goto martian_source;
|
|
|
|
if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr))
|
|
goto martian_destination;
|
|
|
|
/*
|
|
* Now we are ready to route packet.
|
|
*/
|
|
if ((err = fib_lookup(&fl, &res)) != 0) {
|
|
if (!IN_DEV_FORWARD(in_dev))
|
|
goto e_hostunreach;
|
|
goto no_route;
|
|
}
|
|
free_res = 1;
|
|
|
|
RT_CACHE_STAT_INC(in_slow_tot);
|
|
|
|
if (res.type == RTN_BROADCAST)
|
|
goto brd_input;
|
|
|
|
if (res.type == RTN_LOCAL) {
|
|
int result;
|
|
result = fib_validate_source(saddr, daddr, tos,
|
|
loopback_dev.ifindex,
|
|
dev, &spec_dst, &itag);
|
|
if (result < 0)
|
|
goto martian_source;
|
|
if (result)
|
|
flags |= RTCF_DIRECTSRC;
|
|
spec_dst = daddr;
|
|
goto local_input;
|
|
}
|
|
|
|
if (!IN_DEV_FORWARD(in_dev))
|
|
goto e_hostunreach;
|
|
if (res.type != RTN_UNICAST)
|
|
goto martian_destination;
|
|
|
|
err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
|
|
if (err == -ENOBUFS)
|
|
goto e_nobufs;
|
|
if (err == -EINVAL)
|
|
goto e_inval;
|
|
|
|
done:
|
|
in_dev_put(in_dev);
|
|
if (free_res)
|
|
fib_res_put(&res);
|
|
out: return err;
|
|
|
|
brd_input:
|
|
if (skb->protocol != htons(ETH_P_IP))
|
|
goto e_inval;
|
|
|
|
if (ZERONET(saddr))
|
|
spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
|
|
else {
|
|
err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst,
|
|
&itag);
|
|
if (err < 0)
|
|
goto martian_source;
|
|
if (err)
|
|
flags |= RTCF_DIRECTSRC;
|
|
}
|
|
flags |= RTCF_BROADCAST;
|
|
res.type = RTN_BROADCAST;
|
|
RT_CACHE_STAT_INC(in_brd);
|
|
|
|
local_input:
|
|
rth = dst_alloc(&ipv4_dst_ops);
|
|
if (!rth)
|
|
goto e_nobufs;
|
|
|
|
rth->u.dst.output= ip_rt_bug;
|
|
|
|
atomic_set(&rth->u.dst.__refcnt, 1);
|
|
rth->u.dst.flags= DST_HOST;
|
|
if (in_dev->cnf.no_policy)
|
|
rth->u.dst.flags |= DST_NOPOLICY;
|
|
rth->fl.fl4_dst = daddr;
|
|
rth->rt_dst = daddr;
|
|
rth->fl.fl4_tos = tos;
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
rth->fl.fl4_fwmark= skb->nfmark;
|
|
#endif
|
|
rth->fl.fl4_src = saddr;
|
|
rth->rt_src = saddr;
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
rth->u.dst.tclassid = itag;
|
|
#endif
|
|
rth->rt_iif =
|
|
rth->fl.iif = dev->ifindex;
|
|
rth->u.dst.dev = &loopback_dev;
|
|
dev_hold(rth->u.dst.dev);
|
|
rth->idev = in_dev_get(rth->u.dst.dev);
|
|
rth->rt_gateway = daddr;
|
|
rth->rt_spec_dst= spec_dst;
|
|
rth->u.dst.input= ip_local_deliver;
|
|
rth->rt_flags = flags|RTCF_LOCAL;
|
|
if (res.type == RTN_UNREACHABLE) {
|
|
rth->u.dst.input= ip_error;
|
|
rth->u.dst.error= -err;
|
|
rth->rt_flags &= ~RTCF_LOCAL;
|
|
}
|
|
rth->rt_type = res.type;
|
|
hash = rt_hash_code(daddr, saddr ^ (fl.iif << 5));
|
|
err = rt_intern_hash(hash, rth, (struct rtable**)&skb->dst);
|
|
goto done;
|
|
|
|
no_route:
|
|
RT_CACHE_STAT_INC(in_no_route);
|
|
spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
|
|
res.type = RTN_UNREACHABLE;
|
|
goto local_input;
|
|
|
|
/*
|
|
* Do not cache martian addresses: they should be logged (RFC1812)
|
|
*/
|
|
martian_destination:
|
|
RT_CACHE_STAT_INC(in_martian_dst);
|
|
#ifdef CONFIG_IP_ROUTE_VERBOSE
|
|
if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit())
|
|
printk(KERN_WARNING "martian destination %u.%u.%u.%u from "
|
|
"%u.%u.%u.%u, dev %s\n",
|
|
NIPQUAD(daddr), NIPQUAD(saddr), dev->name);
|
|
#endif
|
|
|
|
e_hostunreach:
|
|
err = -EHOSTUNREACH;
|
|
goto done;
|
|
|
|
e_inval:
|
|
err = -EINVAL;
|
|
goto done;
|
|
|
|
e_nobufs:
|
|
err = -ENOBUFS;
|
|
goto done;
|
|
|
|
martian_source:
|
|
ip_handle_martian_source(dev, in_dev, skb, daddr, saddr);
|
|
goto e_inval;
|
|
}
|
|
|
|
int ip_route_input(struct sk_buff *skb, u32 daddr, u32 saddr,
|
|
u8 tos, struct net_device *dev)
|
|
{
|
|
struct rtable * rth;
|
|
unsigned hash;
|
|
int iif = dev->ifindex;
|
|
|
|
tos &= IPTOS_RT_MASK;
|
|
hash = rt_hash_code(daddr, saddr ^ (iif << 5));
|
|
|
|
rcu_read_lock();
|
|
for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
|
|
rth = rcu_dereference(rth->u.rt_next)) {
|
|
if (rth->fl.fl4_dst == daddr &&
|
|
rth->fl.fl4_src == saddr &&
|
|
rth->fl.iif == iif &&
|
|
rth->fl.oif == 0 &&
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
rth->fl.fl4_fwmark == skb->nfmark &&
|
|
#endif
|
|
rth->fl.fl4_tos == tos) {
|
|
rth->u.dst.lastuse = jiffies;
|
|
dst_hold(&rth->u.dst);
|
|
rth->u.dst.__use++;
|
|
RT_CACHE_STAT_INC(in_hit);
|
|
rcu_read_unlock();
|
|
skb->dst = (struct dst_entry*)rth;
|
|
return 0;
|
|
}
|
|
RT_CACHE_STAT_INC(in_hlist_search);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
/* Multicast recognition logic is moved from route cache to here.
|
|
The problem was that too many Ethernet cards have broken/missing
|
|
hardware multicast filters :-( As result the host on multicasting
|
|
network acquires a lot of useless route cache entries, sort of
|
|
SDR messages from all the world. Now we try to get rid of them.
|
|
Really, provided software IP multicast filter is organized
|
|
reasonably (at least, hashed), it does not result in a slowdown
|
|
comparing with route cache reject entries.
|
|
Note, that multicast routers are not affected, because
|
|
route cache entry is created eventually.
|
|
*/
|
|
if (MULTICAST(daddr)) {
|
|
struct in_device *in_dev;
|
|
|
|
rcu_read_lock();
|
|
if ((in_dev = __in_dev_get_rcu(dev)) != NULL) {
|
|
int our = ip_check_mc(in_dev, daddr, saddr,
|
|
skb->nh.iph->protocol);
|
|
if (our
|
|
#ifdef CONFIG_IP_MROUTE
|
|
|| (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev))
|
|
#endif
|
|
) {
|
|
rcu_read_unlock();
|
|
return ip_route_input_mc(skb, daddr, saddr,
|
|
tos, dev, our);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return -EINVAL;
|
|
}
|
|
return ip_route_input_slow(skb, daddr, saddr, tos, dev);
|
|
}
|
|
|
|
static inline int __mkroute_output(struct rtable **result,
|
|
struct fib_result* res,
|
|
const struct flowi *fl,
|
|
const struct flowi *oldflp,
|
|
struct net_device *dev_out,
|
|
unsigned flags)
|
|
{
|
|
struct rtable *rth;
|
|
struct in_device *in_dev;
|
|
u32 tos = RT_FL_TOS(oldflp);
|
|
int err = 0;
|
|
|
|
if (LOOPBACK(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK))
|
|
return -EINVAL;
|
|
|
|
if (fl->fl4_dst == 0xFFFFFFFF)
|
|
res->type = RTN_BROADCAST;
|
|
else if (MULTICAST(fl->fl4_dst))
|
|
res->type = RTN_MULTICAST;
|
|
else if (BADCLASS(fl->fl4_dst) || ZERONET(fl->fl4_dst))
|
|
return -EINVAL;
|
|
|
|
if (dev_out->flags & IFF_LOOPBACK)
|
|
flags |= RTCF_LOCAL;
|
|
|
|
/* get work reference to inet device */
|
|
in_dev = in_dev_get(dev_out);
|
|
if (!in_dev)
|
|
return -EINVAL;
|
|
|
|
if (res->type == RTN_BROADCAST) {
|
|
flags |= RTCF_BROADCAST | RTCF_LOCAL;
|
|
if (res->fi) {
|
|
fib_info_put(res->fi);
|
|
res->fi = NULL;
|
|
}
|
|
} else if (res->type == RTN_MULTICAST) {
|
|
flags |= RTCF_MULTICAST|RTCF_LOCAL;
|
|
if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src,
|
|
oldflp->proto))
|
|
flags &= ~RTCF_LOCAL;
|
|
/* If multicast route do not exist use
|
|
default one, but do not gateway in this case.
|
|
Yes, it is hack.
|
|
*/
|
|
if (res->fi && res->prefixlen < 4) {
|
|
fib_info_put(res->fi);
|
|
res->fi = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
rth = dst_alloc(&ipv4_dst_ops);
|
|
if (!rth) {
|
|
err = -ENOBUFS;
|
|
goto cleanup;
|
|
}
|
|
|
|
atomic_set(&rth->u.dst.__refcnt, 1);
|
|
rth->u.dst.flags= DST_HOST;
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
if (res->fi) {
|
|
rth->rt_multipath_alg = res->fi->fib_mp_alg;
|
|
if (res->fi->fib_nhs > 1)
|
|
rth->u.dst.flags |= DST_BALANCED;
|
|
}
|
|
#endif
|
|
if (in_dev->cnf.no_xfrm)
|
|
rth->u.dst.flags |= DST_NOXFRM;
|
|
if (in_dev->cnf.no_policy)
|
|
rth->u.dst.flags |= DST_NOPOLICY;
|
|
|
|
rth->fl.fl4_dst = oldflp->fl4_dst;
|
|
rth->fl.fl4_tos = tos;
|
|
rth->fl.fl4_src = oldflp->fl4_src;
|
|
rth->fl.oif = oldflp->oif;
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
rth->fl.fl4_fwmark= oldflp->fl4_fwmark;
|
|
#endif
|
|
rth->rt_dst = fl->fl4_dst;
|
|
rth->rt_src = fl->fl4_src;
|
|
rth->rt_iif = oldflp->oif ? : dev_out->ifindex;
|
|
/* get references to the devices that are to be hold by the routing
|
|
cache entry */
|
|
rth->u.dst.dev = dev_out;
|
|
dev_hold(dev_out);
|
|
rth->idev = in_dev_get(dev_out);
|
|
rth->rt_gateway = fl->fl4_dst;
|
|
rth->rt_spec_dst= fl->fl4_src;
|
|
|
|
rth->u.dst.output=ip_output;
|
|
|
|
RT_CACHE_STAT_INC(out_slow_tot);
|
|
|
|
if (flags & RTCF_LOCAL) {
|
|
rth->u.dst.input = ip_local_deliver;
|
|
rth->rt_spec_dst = fl->fl4_dst;
|
|
}
|
|
if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) {
|
|
rth->rt_spec_dst = fl->fl4_src;
|
|
if (flags & RTCF_LOCAL &&
|
|
!(dev_out->flags & IFF_LOOPBACK)) {
|
|
rth->u.dst.output = ip_mc_output;
|
|
RT_CACHE_STAT_INC(out_slow_mc);
|
|
}
|
|
#ifdef CONFIG_IP_MROUTE
|
|
if (res->type == RTN_MULTICAST) {
|
|
if (IN_DEV_MFORWARD(in_dev) &&
|
|
!LOCAL_MCAST(oldflp->fl4_dst)) {
|
|
rth->u.dst.input = ip_mr_input;
|
|
rth->u.dst.output = ip_mc_output;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
rt_set_nexthop(rth, res, 0);
|
|
|
|
rth->rt_flags = flags;
|
|
|
|
*result = rth;
|
|
cleanup:
|
|
/* release work reference to inet device */
|
|
in_dev_put(in_dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline int ip_mkroute_output_def(struct rtable **rp,
|
|
struct fib_result* res,
|
|
const struct flowi *fl,
|
|
const struct flowi *oldflp,
|
|
struct net_device *dev_out,
|
|
unsigned flags)
|
|
{
|
|
struct rtable *rth = NULL;
|
|
int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags);
|
|
unsigned hash;
|
|
if (err == 0) {
|
|
hash = rt_hash_code(oldflp->fl4_dst,
|
|
oldflp->fl4_src ^ (oldflp->oif << 5));
|
|
err = rt_intern_hash(hash, rth, rp);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline int ip_mkroute_output(struct rtable** rp,
|
|
struct fib_result* res,
|
|
const struct flowi *fl,
|
|
const struct flowi *oldflp,
|
|
struct net_device *dev_out,
|
|
unsigned flags)
|
|
{
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
unsigned char hop;
|
|
unsigned hash;
|
|
int err = -EINVAL;
|
|
struct rtable *rth = NULL;
|
|
|
|
if (res->fi && res->fi->fib_nhs > 1) {
|
|
unsigned char hopcount = res->fi->fib_nhs;
|
|
|
|
for (hop = 0; hop < hopcount; hop++) {
|
|
struct net_device *dev2nexthop;
|
|
|
|
res->nh_sel = hop;
|
|
|
|
/* hold a work reference to the output device */
|
|
dev2nexthop = FIB_RES_DEV(*res);
|
|
dev_hold(dev2nexthop);
|
|
|
|
/* put reference to previous result */
|
|
if (hop)
|
|
ip_rt_put(*rp);
|
|
|
|
err = __mkroute_output(&rth, res, fl, oldflp,
|
|
dev2nexthop, flags);
|
|
|
|
if (err != 0)
|
|
goto cleanup;
|
|
|
|
hash = rt_hash_code(oldflp->fl4_dst,
|
|
oldflp->fl4_src ^
|
|
(oldflp->oif << 5));
|
|
err = rt_intern_hash(hash, rth, rp);
|
|
|
|
/* forward hop information to multipath impl. */
|
|
multipath_set_nhinfo(rth,
|
|
FIB_RES_NETWORK(*res),
|
|
FIB_RES_NETMASK(*res),
|
|
res->prefixlen,
|
|
&FIB_RES_NH(*res));
|
|
cleanup:
|
|
/* release work reference to output device */
|
|
dev_put(dev2nexthop);
|
|
|
|
if (err != 0)
|
|
return err;
|
|
}
|
|
return err;
|
|
} else {
|
|
return ip_mkroute_output_def(rp, res, fl, oldflp, dev_out,
|
|
flags);
|
|
}
|
|
#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
|
|
return ip_mkroute_output_def(rp, res, fl, oldflp, dev_out, flags);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Major route resolver routine.
|
|
*/
|
|
|
|
static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
|
|
{
|
|
u32 tos = RT_FL_TOS(oldflp);
|
|
struct flowi fl = { .nl_u = { .ip4_u =
|
|
{ .daddr = oldflp->fl4_dst,
|
|
.saddr = oldflp->fl4_src,
|
|
.tos = tos & IPTOS_RT_MASK,
|
|
.scope = ((tos & RTO_ONLINK) ?
|
|
RT_SCOPE_LINK :
|
|
RT_SCOPE_UNIVERSE),
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
.fwmark = oldflp->fl4_fwmark
|
|
#endif
|
|
} },
|
|
.iif = loopback_dev.ifindex,
|
|
.oif = oldflp->oif };
|
|
struct fib_result res;
|
|
unsigned flags = 0;
|
|
struct net_device *dev_out = NULL;
|
|
int free_res = 0;
|
|
int err;
|
|
|
|
|
|
res.fi = NULL;
|
|
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
|
res.r = NULL;
|
|
#endif
|
|
|
|
if (oldflp->fl4_src) {
|
|
err = -EINVAL;
|
|
if (MULTICAST(oldflp->fl4_src) ||
|
|
BADCLASS(oldflp->fl4_src) ||
|
|
ZERONET(oldflp->fl4_src))
|
|
goto out;
|
|
|
|
/* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
|
|
dev_out = ip_dev_find(oldflp->fl4_src);
|
|
if (dev_out == NULL)
|
|
goto out;
|
|
|
|
/* I removed check for oif == dev_out->oif here.
|
|
It was wrong for two reasons:
|
|
1. ip_dev_find(saddr) can return wrong iface, if saddr is
|
|
assigned to multiple interfaces.
|
|
2. Moreover, we are allowed to send packets with saddr
|
|
of another iface. --ANK
|
|
*/
|
|
|
|
if (oldflp->oif == 0
|
|
&& (MULTICAST(oldflp->fl4_dst) || oldflp->fl4_dst == 0xFFFFFFFF)) {
|
|
/* Special hack: user can direct multicasts
|
|
and limited broadcast via necessary interface
|
|
without fiddling with IP_MULTICAST_IF or IP_PKTINFO.
|
|
This hack is not just for fun, it allows
|
|
vic,vat and friends to work.
|
|
They bind socket to loopback, set ttl to zero
|
|
and expect that it will work.
|
|
From the viewpoint of routing cache they are broken,
|
|
because we are not allowed to build multicast path
|
|
with loopback source addr (look, routing cache
|
|
cannot know, that ttl is zero, so that packet
|
|
will not leave this host and route is valid).
|
|
Luckily, this hack is good workaround.
|
|
*/
|
|
|
|
fl.oif = dev_out->ifindex;
|
|
goto make_route;
|
|
}
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
dev_out = NULL;
|
|
}
|
|
|
|
|
|
if (oldflp->oif) {
|
|
dev_out = dev_get_by_index(oldflp->oif);
|
|
err = -ENODEV;
|
|
if (dev_out == NULL)
|
|
goto out;
|
|
|
|
/* RACE: Check return value of inet_select_addr instead. */
|
|
if (__in_dev_get_rtnl(dev_out) == NULL) {
|
|
dev_put(dev_out);
|
|
goto out; /* Wrong error code */
|
|
}
|
|
|
|
if (LOCAL_MCAST(oldflp->fl4_dst) || oldflp->fl4_dst == 0xFFFFFFFF) {
|
|
if (!fl.fl4_src)
|
|
fl.fl4_src = inet_select_addr(dev_out, 0,
|
|
RT_SCOPE_LINK);
|
|
goto make_route;
|
|
}
|
|
if (!fl.fl4_src) {
|
|
if (MULTICAST(oldflp->fl4_dst))
|
|
fl.fl4_src = inet_select_addr(dev_out, 0,
|
|
fl.fl4_scope);
|
|
else if (!oldflp->fl4_dst)
|
|
fl.fl4_src = inet_select_addr(dev_out, 0,
|
|
RT_SCOPE_HOST);
|
|
}
|
|
}
|
|
|
|
if (!fl.fl4_dst) {
|
|
fl.fl4_dst = fl.fl4_src;
|
|
if (!fl.fl4_dst)
|
|
fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK);
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
dev_out = &loopback_dev;
|
|
dev_hold(dev_out);
|
|
fl.oif = loopback_dev.ifindex;
|
|
res.type = RTN_LOCAL;
|
|
flags |= RTCF_LOCAL;
|
|
goto make_route;
|
|
}
|
|
|
|
if (fib_lookup(&fl, &res)) {
|
|
res.fi = NULL;
|
|
if (oldflp->oif) {
|
|
/* Apparently, routing tables are wrong. Assume,
|
|
that the destination is on link.
|
|
|
|
WHY? DW.
|
|
Because we are allowed to send to iface
|
|
even if it has NO routes and NO assigned
|
|
addresses. When oif is specified, routing
|
|
tables are looked up with only one purpose:
|
|
to catch if destination is gatewayed, rather than
|
|
direct. Moreover, if MSG_DONTROUTE is set,
|
|
we send packet, ignoring both routing tables
|
|
and ifaddr state. --ANK
|
|
|
|
|
|
We could make it even if oif is unknown,
|
|
likely IPv6, but we do not.
|
|
*/
|
|
|
|
if (fl.fl4_src == 0)
|
|
fl.fl4_src = inet_select_addr(dev_out, 0,
|
|
RT_SCOPE_LINK);
|
|
res.type = RTN_UNICAST;
|
|
goto make_route;
|
|
}
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
err = -ENETUNREACH;
|
|
goto out;
|
|
}
|
|
free_res = 1;
|
|
|
|
if (res.type == RTN_LOCAL) {
|
|
if (!fl.fl4_src)
|
|
fl.fl4_src = fl.fl4_dst;
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
dev_out = &loopback_dev;
|
|
dev_hold(dev_out);
|
|
fl.oif = dev_out->ifindex;
|
|
if (res.fi)
|
|
fib_info_put(res.fi);
|
|
res.fi = NULL;
|
|
flags |= RTCF_LOCAL;
|
|
goto make_route;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH
|
|
if (res.fi->fib_nhs > 1 && fl.oif == 0)
|
|
fib_select_multipath(&fl, &res);
|
|
else
|
|
#endif
|
|
if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif)
|
|
fib_select_default(&fl, &res);
|
|
|
|
if (!fl.fl4_src)
|
|
fl.fl4_src = FIB_RES_PREFSRC(res);
|
|
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
dev_out = FIB_RES_DEV(res);
|
|
dev_hold(dev_out);
|
|
fl.oif = dev_out->ifindex;
|
|
|
|
|
|
make_route:
|
|
err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags);
|
|
|
|
|
|
if (free_res)
|
|
fib_res_put(&res);
|
|
if (dev_out)
|
|
dev_put(dev_out);
|
|
out: return err;
|
|
}
|
|
|
|
int __ip_route_output_key(struct rtable **rp, const struct flowi *flp)
|
|
{
|
|
unsigned hash;
|
|
struct rtable *rth;
|
|
|
|
hash = rt_hash_code(flp->fl4_dst, flp->fl4_src ^ (flp->oif << 5));
|
|
|
|
rcu_read_lock_bh();
|
|
for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
|
|
rth = rcu_dereference(rth->u.rt_next)) {
|
|
if (rth->fl.fl4_dst == flp->fl4_dst &&
|
|
rth->fl.fl4_src == flp->fl4_src &&
|
|
rth->fl.iif == 0 &&
|
|
rth->fl.oif == flp->oif &&
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
rth->fl.fl4_fwmark == flp->fl4_fwmark &&
|
|
#endif
|
|
!((rth->fl.fl4_tos ^ flp->fl4_tos) &
|
|
(IPTOS_RT_MASK | RTO_ONLINK))) {
|
|
|
|
/* check for multipath routes and choose one if
|
|
* necessary
|
|
*/
|
|
if (multipath_select_route(flp, rth, rp)) {
|
|
dst_hold(&(*rp)->u.dst);
|
|
RT_CACHE_STAT_INC(out_hit);
|
|
rcu_read_unlock_bh();
|
|
return 0;
|
|
}
|
|
|
|
rth->u.dst.lastuse = jiffies;
|
|
dst_hold(&rth->u.dst);
|
|
rth->u.dst.__use++;
|
|
RT_CACHE_STAT_INC(out_hit);
|
|
rcu_read_unlock_bh();
|
|
*rp = rth;
|
|
return 0;
|
|
}
|
|
RT_CACHE_STAT_INC(out_hlist_search);
|
|
}
|
|
rcu_read_unlock_bh();
|
|
|
|
return ip_route_output_slow(rp, flp);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(__ip_route_output_key);
|
|
|
|
int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags)
|
|
{
|
|
int err;
|
|
|
|
if ((err = __ip_route_output_key(rp, flp)) != 0)
|
|
return err;
|
|
|
|
if (flp->proto) {
|
|
if (!flp->fl4_src)
|
|
flp->fl4_src = (*rp)->rt_src;
|
|
if (!flp->fl4_dst)
|
|
flp->fl4_dst = (*rp)->rt_dst;
|
|
return xfrm_lookup((struct dst_entry **)rp, flp, sk, flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ip_route_output_flow);
|
|
|
|
int ip_route_output_key(struct rtable **rp, struct flowi *flp)
|
|
{
|
|
return ip_route_output_flow(rp, flp, NULL, 0);
|
|
}
|
|
|
|
static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
|
|
int nowait, unsigned int flags)
|
|
{
|
|
struct rtable *rt = (struct rtable*)skb->dst;
|
|
struct rtmsg *r;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb->tail;
|
|
struct rta_cacheinfo ci;
|
|
#ifdef CONFIG_IP_MROUTE
|
|
struct rtattr *eptr;
|
|
#endif
|
|
nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
|
|
r = NLMSG_DATA(nlh);
|
|
r->rtm_family = AF_INET;
|
|
r->rtm_dst_len = 32;
|
|
r->rtm_src_len = 0;
|
|
r->rtm_tos = rt->fl.fl4_tos;
|
|
r->rtm_table = RT_TABLE_MAIN;
|
|
r->rtm_type = rt->rt_type;
|
|
r->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
r->rtm_protocol = RTPROT_UNSPEC;
|
|
r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
|
|
if (rt->rt_flags & RTCF_NOTIFY)
|
|
r->rtm_flags |= RTM_F_NOTIFY;
|
|
RTA_PUT(skb, RTA_DST, 4, &rt->rt_dst);
|
|
if (rt->fl.fl4_src) {
|
|
r->rtm_src_len = 32;
|
|
RTA_PUT(skb, RTA_SRC, 4, &rt->fl.fl4_src);
|
|
}
|
|
if (rt->u.dst.dev)
|
|
RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex);
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
if (rt->u.dst.tclassid)
|
|
RTA_PUT(skb, RTA_FLOW, 4, &rt->u.dst.tclassid);
|
|
#endif
|
|
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
|
|
if (rt->rt_multipath_alg != IP_MP_ALG_NONE) {
|
|
__u32 alg = rt->rt_multipath_alg;
|
|
|
|
RTA_PUT(skb, RTA_MP_ALGO, 4, &alg);
|
|
}
|
|
#endif
|
|
if (rt->fl.iif)
|
|
RTA_PUT(skb, RTA_PREFSRC, 4, &rt->rt_spec_dst);
|
|
else if (rt->rt_src != rt->fl.fl4_src)
|
|
RTA_PUT(skb, RTA_PREFSRC, 4, &rt->rt_src);
|
|
if (rt->rt_dst != rt->rt_gateway)
|
|
RTA_PUT(skb, RTA_GATEWAY, 4, &rt->rt_gateway);
|
|
if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
|
|
goto rtattr_failure;
|
|
ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
|
|
ci.rta_used = rt->u.dst.__use;
|
|
ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
|
|
if (rt->u.dst.expires)
|
|
ci.rta_expires = jiffies_to_clock_t(rt->u.dst.expires - jiffies);
|
|
else
|
|
ci.rta_expires = 0;
|
|
ci.rta_error = rt->u.dst.error;
|
|
ci.rta_id = ci.rta_ts = ci.rta_tsage = 0;
|
|
if (rt->peer) {
|
|
ci.rta_id = rt->peer->ip_id_count;
|
|
if (rt->peer->tcp_ts_stamp) {
|
|
ci.rta_ts = rt->peer->tcp_ts;
|
|
ci.rta_tsage = xtime.tv_sec - rt->peer->tcp_ts_stamp;
|
|
}
|
|
}
|
|
#ifdef CONFIG_IP_MROUTE
|
|
eptr = (struct rtattr*)skb->tail;
|
|
#endif
|
|
RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
|
|
if (rt->fl.iif) {
|
|
#ifdef CONFIG_IP_MROUTE
|
|
u32 dst = rt->rt_dst;
|
|
|
|
if (MULTICAST(dst) && !LOCAL_MCAST(dst) &&
|
|
ipv4_devconf.mc_forwarding) {
|
|
int err = ipmr_get_route(skb, r, nowait);
|
|
if (err <= 0) {
|
|
if (!nowait) {
|
|
if (err == 0)
|
|
return 0;
|
|
goto nlmsg_failure;
|
|
} else {
|
|
if (err == -EMSGSIZE)
|
|
goto nlmsg_failure;
|
|
((struct rta_cacheinfo*)RTA_DATA(eptr))->rta_error = err;
|
|
}
|
|
}
|
|
} else
|
|
#endif
|
|
RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
|
|
}
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
rtattr_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct rtattr **rta = arg;
|
|
struct rtmsg *rtm = NLMSG_DATA(nlh);
|
|
struct rtable *rt = NULL;
|
|
u32 dst = 0;
|
|
u32 src = 0;
|
|
int iif = 0;
|
|
int err = -ENOBUFS;
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
/* Reserve room for dummy headers, this skb can pass
|
|
through good chunk of routing engine.
|
|
*/
|
|
skb->mac.raw = skb->nh.raw = skb->data;
|
|
|
|
/* Bugfix: need to give ip_route_input enough of an IP header to not gag. */
|
|
skb->nh.iph->protocol = IPPROTO_ICMP;
|
|
skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr));
|
|
|
|
if (rta[RTA_SRC - 1])
|
|
memcpy(&src, RTA_DATA(rta[RTA_SRC - 1]), 4);
|
|
if (rta[RTA_DST - 1])
|
|
memcpy(&dst, RTA_DATA(rta[RTA_DST - 1]), 4);
|
|
if (rta[RTA_IIF - 1])
|
|
memcpy(&iif, RTA_DATA(rta[RTA_IIF - 1]), sizeof(int));
|
|
|
|
if (iif) {
|
|
struct net_device *dev = __dev_get_by_index(iif);
|
|
err = -ENODEV;
|
|
if (!dev)
|
|
goto out_free;
|
|
skb->protocol = htons(ETH_P_IP);
|
|
skb->dev = dev;
|
|
local_bh_disable();
|
|
err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev);
|
|
local_bh_enable();
|
|
rt = (struct rtable*)skb->dst;
|
|
if (!err && rt->u.dst.error)
|
|
err = -rt->u.dst.error;
|
|
} else {
|
|
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = dst,
|
|
.saddr = src,
|
|
.tos = rtm->rtm_tos } } };
|
|
int oif = 0;
|
|
if (rta[RTA_OIF - 1])
|
|
memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
|
|
fl.oif = oif;
|
|
err = ip_route_output_key(&rt, &fl);
|
|
}
|
|
if (err)
|
|
goto out_free;
|
|
|
|
skb->dst = &rt->u.dst;
|
|
if (rtm->rtm_flags & RTM_F_NOTIFY)
|
|
rt->rt_flags |= RTCF_NOTIFY;
|
|
|
|
NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
|
|
|
|
err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
|
|
RTM_NEWROUTE, 0, 0);
|
|
if (!err)
|
|
goto out_free;
|
|
if (err < 0) {
|
|
err = -EMSGSIZE;
|
|
goto out_free;
|
|
}
|
|
|
|
err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
|
|
if (err > 0)
|
|
err = 0;
|
|
out: return err;
|
|
|
|
out_free:
|
|
kfree_skb(skb);
|
|
goto out;
|
|
}
|
|
|
|
int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct rtable *rt;
|
|
int h, s_h;
|
|
int idx, s_idx;
|
|
|
|
s_h = cb->args[0];
|
|
s_idx = idx = cb->args[1];
|
|
for (h = 0; h <= rt_hash_mask; h++) {
|
|
if (h < s_h) continue;
|
|
if (h > s_h)
|
|
s_idx = 0;
|
|
rcu_read_lock_bh();
|
|
for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt;
|
|
rt = rcu_dereference(rt->u.rt_next), idx++) {
|
|
if (idx < s_idx)
|
|
continue;
|
|
skb->dst = dst_clone(&rt->u.dst);
|
|
if (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;
|
|
}
|
|
|
|
void ip_rt_multicast_event(struct in_device *in_dev)
|
|
{
|
|
rt_cache_flush(0);
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static int flush_delay;
|
|
|
|
static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write,
|
|
struct file *filp, void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
if (write) {
|
|
proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
|
|
rt_cache_flush(flush_delay);
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table,
|
|
int __user *name,
|
|
int nlen,
|
|
void __user *oldval,
|
|
size_t __user *oldlenp,
|
|
void __user *newval,
|
|
size_t newlen,
|
|
void **context)
|
|
{
|
|
int delay;
|
|
if (newlen != sizeof(int))
|
|
return -EINVAL;
|
|
if (get_user(delay, (int __user *)newval))
|
|
return -EFAULT;
|
|
rt_cache_flush(delay);
|
|
return 0;
|
|
}
|
|
|
|
ctl_table ipv4_route_table[] = {
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_FLUSH,
|
|
.procname = "flush",
|
|
.data = &flush_delay,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0200,
|
|
.proc_handler = &ipv4_sysctl_rtcache_flush,
|
|
.strategy = &ipv4_sysctl_rtcache_flush_strategy,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_MIN_DELAY,
|
|
.procname = "min_delay",
|
|
.data = &ip_rt_min_delay,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_MAX_DELAY,
|
|
.procname = "max_delay",
|
|
.data = &ip_rt_max_delay,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_GC_THRESH,
|
|
.procname = "gc_thresh",
|
|
.data = &ipv4_dst_ops.gc_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_MAX_SIZE,
|
|
.procname = "max_size",
|
|
.data = &ip_rt_max_size,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
/* Deprecated. Use gc_min_interval_ms */
|
|
|
|
.ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL,
|
|
.procname = "gc_min_interval",
|
|
.data = &ip_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS,
|
|
.procname = "gc_min_interval_ms",
|
|
.data = &ip_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_ms_jiffies,
|
|
.strategy = &sysctl_ms_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT,
|
|
.procname = "gc_timeout",
|
|
.data = &ip_rt_gc_timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_GC_INTERVAL,
|
|
.procname = "gc_interval",
|
|
.data = &ip_rt_gc_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD,
|
|
.procname = "redirect_load",
|
|
.data = &ip_rt_redirect_load,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER,
|
|
.procname = "redirect_number",
|
|
.data = &ip_rt_redirect_number,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE,
|
|
.procname = "redirect_silence",
|
|
.data = &ip_rt_redirect_silence,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_ERROR_COST,
|
|
.procname = "error_cost",
|
|
.data = &ip_rt_error_cost,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_ERROR_BURST,
|
|
.procname = "error_burst",
|
|
.data = &ip_rt_error_burst,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY,
|
|
.procname = "gc_elasticity",
|
|
.data = &ip_rt_gc_elasticity,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES,
|
|
.procname = "mtu_expires",
|
|
.data = &ip_rt_mtu_expires,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_MIN_PMTU,
|
|
.procname = "min_pmtu",
|
|
.data = &ip_rt_min_pmtu,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS,
|
|
.procname = "min_adv_mss",
|
|
.data = &ip_rt_min_advmss,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL,
|
|
.procname = "secret_interval",
|
|
.data = &ip_rt_secret_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{ .ctl_name = 0 }
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
struct ip_rt_acct *ip_rt_acct;
|
|
|
|
/* This code sucks. But you should have seen it before! --RR */
|
|
|
|
/* IP route accounting ptr for this logical cpu number. */
|
|
#define IP_RT_ACCT_CPU(i) (ip_rt_acct + i * 256)
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static int ip_rt_acct_read(char *buffer, char **start, off_t offset,
|
|
int length, int *eof, void *data)
|
|
{
|
|
unsigned int i;
|
|
|
|
if ((offset & 3) || (length & 3))
|
|
return -EIO;
|
|
|
|
if (offset >= sizeof(struct ip_rt_acct) * 256) {
|
|
*eof = 1;
|
|
return 0;
|
|
}
|
|
|
|
if (offset + length >= sizeof(struct ip_rt_acct) * 256) {
|
|
length = sizeof(struct ip_rt_acct) * 256 - offset;
|
|
*eof = 1;
|
|
}
|
|
|
|
offset /= sizeof(u32);
|
|
|
|
if (length > 0) {
|
|
u32 *src = ((u32 *) IP_RT_ACCT_CPU(0)) + offset;
|
|
u32 *dst = (u32 *) buffer;
|
|
|
|
/* Copy first cpu. */
|
|
*start = buffer;
|
|
memcpy(dst, src, length);
|
|
|
|
/* Add the other cpus in, one int at a time */
|
|
for_each_possible_cpu(i) {
|
|
unsigned int j;
|
|
|
|
src = ((u32 *) IP_RT_ACCT_CPU(i)) + offset;
|
|
|
|
for (j = 0; j < length/4; j++)
|
|
dst[j] += src[j];
|
|
}
|
|
}
|
|
return length;
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
#endif /* CONFIG_NET_CLS_ROUTE */
|
|
|
|
static __initdata unsigned long rhash_entries;
|
|
static int __init set_rhash_entries(char *str)
|
|
{
|
|
if (!str)
|
|
return 0;
|
|
rhash_entries = simple_strtoul(str, &str, 0);
|
|
return 1;
|
|
}
|
|
__setup("rhash_entries=", set_rhash_entries);
|
|
|
|
int __init ip_rt_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
rt_hash_rnd = (int) ((num_physpages ^ (num_physpages>>8)) ^
|
|
(jiffies ^ (jiffies >> 7)));
|
|
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
{
|
|
int order;
|
|
for (order = 0;
|
|
(PAGE_SIZE << order) < 256 * sizeof(struct ip_rt_acct) * NR_CPUS; order++)
|
|
/* NOTHING */;
|
|
ip_rt_acct = (struct ip_rt_acct *)__get_free_pages(GFP_KERNEL, order);
|
|
if (!ip_rt_acct)
|
|
panic("IP: failed to allocate ip_rt_acct\n");
|
|
memset(ip_rt_acct, 0, PAGE_SIZE << order);
|
|
}
|
|
#endif
|
|
|
|
ipv4_dst_ops.kmem_cachep = kmem_cache_create("ip_dst_cache",
|
|
sizeof(struct rtable),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL, NULL);
|
|
|
|
if (!ipv4_dst_ops.kmem_cachep)
|
|
panic("IP: failed to allocate ip_dst_cache\n");
|
|
|
|
rt_hash_table = (struct rt_hash_bucket *)
|
|
alloc_large_system_hash("IP route cache",
|
|
sizeof(struct rt_hash_bucket),
|
|
rhash_entries,
|
|
(num_physpages >= 128 * 1024) ?
|
|
15 : 17,
|
|
HASH_HIGHMEM,
|
|
&rt_hash_log,
|
|
&rt_hash_mask,
|
|
0);
|
|
memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket));
|
|
rt_hash_lock_init();
|
|
|
|
ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1);
|
|
ip_rt_max_size = (rt_hash_mask + 1) * 16;
|
|
|
|
devinet_init();
|
|
ip_fib_init();
|
|
|
|
init_timer(&rt_flush_timer);
|
|
rt_flush_timer.function = rt_run_flush;
|
|
init_timer(&rt_periodic_timer);
|
|
rt_periodic_timer.function = rt_check_expire;
|
|
init_timer(&rt_secret_timer);
|
|
rt_secret_timer.function = rt_secret_rebuild;
|
|
|
|
/* All the timers, started at system startup tend
|
|
to synchronize. Perturb it a bit.
|
|
*/
|
|
rt_periodic_timer.expires = jiffies + net_random() % ip_rt_gc_interval +
|
|
ip_rt_gc_interval;
|
|
add_timer(&rt_periodic_timer);
|
|
|
|
rt_secret_timer.expires = jiffies + net_random() % ip_rt_secret_interval +
|
|
ip_rt_secret_interval;
|
|
add_timer(&rt_secret_timer);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
{
|
|
struct proc_dir_entry *rtstat_pde = NULL; /* keep gcc happy */
|
|
if (!proc_net_fops_create("rt_cache", S_IRUGO, &rt_cache_seq_fops) ||
|
|
!(rtstat_pde = create_proc_entry("rt_cache", S_IRUGO,
|
|
proc_net_stat))) {
|
|
return -ENOMEM;
|
|
}
|
|
rtstat_pde->proc_fops = &rt_cpu_seq_fops;
|
|
}
|
|
#ifdef CONFIG_NET_CLS_ROUTE
|
|
create_proc_read_entry("rt_acct", 0, proc_net, ip_rt_acct_read, NULL);
|
|
#endif
|
|
#endif
|
|
#ifdef CONFIG_XFRM
|
|
xfrm_init();
|
|
xfrm4_init();
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
EXPORT_SYMBOL(__ip_select_ident);
|
|
EXPORT_SYMBOL(ip_route_input);
|
|
EXPORT_SYMBOL(ip_route_output_key);
|