forked from luck/tmp_suning_uos_patched
adf30907d6
Define three accessors to get/set dst attached to a skb struct dst_entry *skb_dst(const struct sk_buff *skb) void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst) void skb_dst_drop(struct sk_buff *skb) This one should replace occurrences of : dst_release(skb->dst) skb->dst = NULL; Delete skb->dst field Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2825 lines
68 KiB
C
2825 lines
68 KiB
C
/*
|
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* Linux INET6 implementation
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* FIB front-end.
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*
|
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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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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/* Changes:
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*
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* YOSHIFUJI Hideaki @USAGI
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* reworked default router selection.
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* - respect outgoing interface
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* - select from (probably) reachable routers (i.e.
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* routers in REACHABLE, STALE, DELAY or PROBE states).
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* - always select the same router if it is (probably)
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* reachable. otherwise, round-robin the list.
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* Ville Nuorvala
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* Fixed routing subtrees.
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*/
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|
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/times.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/route.h>
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#include <linux/netdevice.h>
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#include <linux/in6.h>
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#include <linux/mroute6.h>
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#include <linux/init.h>
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#include <linux/if_arp.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/nsproxy.h>
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#include <net/net_namespace.h>
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#include <net/snmp.h>
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#include <net/ipv6.h>
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#include <net/ip6_fib.h>
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#include <net/ip6_route.h>
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#include <net/ndisc.h>
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#include <net/addrconf.h>
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#include <net/tcp.h>
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#include <linux/rtnetlink.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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#include <net/netevent.h>
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#include <net/netlink.h>
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|
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#include <asm/uaccess.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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/* Set to 3 to get tracing. */
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#define RT6_DEBUG 2
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|
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#if RT6_DEBUG >= 3
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#define RDBG(x) printk x
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#define RT6_TRACE(x...) printk(KERN_DEBUG x)
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#else
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#define RDBG(x)
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#define RT6_TRACE(x...) do { ; } while (0)
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#endif
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|
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#define CLONE_OFFLINK_ROUTE 0
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static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
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static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
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static struct dst_entry *ip6_negative_advice(struct dst_entry *);
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static void ip6_dst_destroy(struct dst_entry *);
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static void ip6_dst_ifdown(struct dst_entry *,
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struct net_device *dev, int how);
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static int ip6_dst_gc(struct dst_ops *ops);
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|
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static int ip6_pkt_discard(struct sk_buff *skb);
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static int ip6_pkt_discard_out(struct sk_buff *skb);
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static void ip6_link_failure(struct sk_buff *skb);
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static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
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|
|
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#ifdef CONFIG_IPV6_ROUTE_INFO
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static struct rt6_info *rt6_add_route_info(struct net *net,
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struct in6_addr *prefix, int prefixlen,
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struct in6_addr *gwaddr, int ifindex,
|
|
unsigned pref);
|
|
static struct rt6_info *rt6_get_route_info(struct net *net,
|
|
struct in6_addr *prefix, int prefixlen,
|
|
struct in6_addr *gwaddr, int ifindex);
|
|
#endif
|
|
|
|
static struct dst_ops ip6_dst_ops_template = {
|
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.family = AF_INET6,
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.protocol = cpu_to_be16(ETH_P_IPV6),
|
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.gc = ip6_dst_gc,
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.gc_thresh = 1024,
|
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.check = ip6_dst_check,
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.destroy = ip6_dst_destroy,
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.ifdown = ip6_dst_ifdown,
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.negative_advice = ip6_negative_advice,
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.link_failure = ip6_link_failure,
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.update_pmtu = ip6_rt_update_pmtu,
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.local_out = __ip6_local_out,
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|
.entries = ATOMIC_INIT(0),
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|
};
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|
|
|
static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|
{
|
|
}
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|
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|
static struct dst_ops ip6_dst_blackhole_ops = {
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.family = AF_INET6,
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.protocol = cpu_to_be16(ETH_P_IPV6),
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.destroy = ip6_dst_destroy,
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.check = ip6_dst_check,
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.update_pmtu = ip6_rt_blackhole_update_pmtu,
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|
.entries = ATOMIC_INIT(0),
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|
};
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|
static struct rt6_info ip6_null_entry_template = {
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|
.u = {
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|
.dst = {
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.__refcnt = ATOMIC_INIT(1),
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|
.__use = 1,
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.obsolete = -1,
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.error = -ENETUNREACH,
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.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
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.input = ip6_pkt_discard,
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.output = ip6_pkt_discard_out,
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|
}
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},
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.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
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.rt6i_protocol = RTPROT_KERNEL,
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.rt6i_metric = ~(u32) 0,
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.rt6i_ref = ATOMIC_INIT(1),
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|
};
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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static int ip6_pkt_prohibit(struct sk_buff *skb);
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static int ip6_pkt_prohibit_out(struct sk_buff *skb);
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static struct rt6_info ip6_prohibit_entry_template = {
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|
.u = {
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|
.dst = {
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.__refcnt = ATOMIC_INIT(1),
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.__use = 1,
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|
.obsolete = -1,
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.error = -EACCES,
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|
.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
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.input = ip6_pkt_prohibit,
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.output = ip6_pkt_prohibit_out,
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|
}
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|
},
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|
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
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.rt6i_protocol = RTPROT_KERNEL,
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.rt6i_metric = ~(u32) 0,
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.rt6i_ref = ATOMIC_INIT(1),
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};
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|
|
static struct rt6_info ip6_blk_hole_entry_template = {
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.u = {
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|
.dst = {
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.__refcnt = ATOMIC_INIT(1),
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.__use = 1,
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.obsolete = -1,
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.error = -EINVAL,
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.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
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.input = dst_discard,
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.output = dst_discard,
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|
}
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|
},
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.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
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|
.rt6i_protocol = RTPROT_KERNEL,
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.rt6i_metric = ~(u32) 0,
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|
.rt6i_ref = ATOMIC_INIT(1),
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|
};
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|
|
|
#endif
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|
/* allocate dst with ip6_dst_ops */
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|
static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops)
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|
{
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|
return (struct rt6_info *)dst_alloc(ops);
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|
}
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|
static void ip6_dst_destroy(struct dst_entry *dst)
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|
{
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struct rt6_info *rt = (struct rt6_info *)dst;
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struct inet6_dev *idev = rt->rt6i_idev;
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if (idev != NULL) {
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rt->rt6i_idev = NULL;
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in6_dev_put(idev);
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}
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}
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static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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int how)
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|
{
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|
struct rt6_info *rt = (struct rt6_info *)dst;
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struct inet6_dev *idev = rt->rt6i_idev;
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struct net_device *loopback_dev =
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dev_net(dev)->loopback_dev;
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if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
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struct inet6_dev *loopback_idev =
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in6_dev_get(loopback_dev);
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if (loopback_idev != NULL) {
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rt->rt6i_idev = loopback_idev;
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in6_dev_put(idev);
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}
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}
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}
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static __inline__ int rt6_check_expired(const struct rt6_info *rt)
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{
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return (rt->rt6i_flags & RTF_EXPIRES &&
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time_after(jiffies, rt->rt6i_expires));
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}
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static inline int rt6_need_strict(struct in6_addr *daddr)
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{
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return (ipv6_addr_type(daddr) &
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(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK));
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}
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/*
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* Route lookup. Any table->tb6_lock is implied.
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*/
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static inline struct rt6_info *rt6_device_match(struct net *net,
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struct rt6_info *rt,
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struct in6_addr *saddr,
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int oif,
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int flags)
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{
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struct rt6_info *local = NULL;
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struct rt6_info *sprt;
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if (!oif && ipv6_addr_any(saddr))
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goto out;
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for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) {
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struct net_device *dev = sprt->rt6i_dev;
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if (oif) {
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if (dev->ifindex == oif)
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return sprt;
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if (dev->flags & IFF_LOOPBACK) {
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if (sprt->rt6i_idev == NULL ||
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sprt->rt6i_idev->dev->ifindex != oif) {
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if (flags & RT6_LOOKUP_F_IFACE && oif)
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continue;
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if (local && (!oif ||
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local->rt6i_idev->dev->ifindex == oif))
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continue;
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}
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local = sprt;
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}
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} else {
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if (ipv6_chk_addr(net, saddr, dev,
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flags & RT6_LOOKUP_F_IFACE))
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return sprt;
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}
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}
|
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|
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if (oif) {
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if (local)
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return local;
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|
|
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if (flags & RT6_LOOKUP_F_IFACE)
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return net->ipv6.ip6_null_entry;
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}
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out:
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return rt;
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|
}
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|
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#ifdef CONFIG_IPV6_ROUTER_PREF
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static void rt6_probe(struct rt6_info *rt)
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{
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struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
|
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/*
|
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* Okay, this does not seem to be appropriate
|
|
* for now, however, we need to check if it
|
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* is really so; aka Router Reachability Probing.
|
|
*
|
|
* Router Reachability Probe MUST be rate-limited
|
|
* to no more than one per minute.
|
|
*/
|
|
if (!neigh || (neigh->nud_state & NUD_VALID))
|
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return;
|
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read_lock_bh(&neigh->lock);
|
|
if (!(neigh->nud_state & NUD_VALID) &&
|
|
time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
|
|
struct in6_addr mcaddr;
|
|
struct in6_addr *target;
|
|
|
|
neigh->updated = jiffies;
|
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read_unlock_bh(&neigh->lock);
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|
|
|
target = (struct in6_addr *)&neigh->primary_key;
|
|
addrconf_addr_solict_mult(target, &mcaddr);
|
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ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
|
|
} else
|
|
read_unlock_bh(&neigh->lock);
|
|
}
|
|
#else
|
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static inline void rt6_probe(struct rt6_info *rt)
|
|
{
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Default Router Selection (RFC 2461 6.3.6)
|
|
*/
|
|
static inline int rt6_check_dev(struct rt6_info *rt, int oif)
|
|
{
|
|
struct net_device *dev = rt->rt6i_dev;
|
|
if (!oif || dev->ifindex == oif)
|
|
return 2;
|
|
if ((dev->flags & IFF_LOOPBACK) &&
|
|
rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline int rt6_check_neigh(struct rt6_info *rt)
|
|
{
|
|
struct neighbour *neigh = rt->rt6i_nexthop;
|
|
int m;
|
|
if (rt->rt6i_flags & RTF_NONEXTHOP ||
|
|
!(rt->rt6i_flags & RTF_GATEWAY))
|
|
m = 1;
|
|
else if (neigh) {
|
|
read_lock_bh(&neigh->lock);
|
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if (neigh->nud_state & NUD_VALID)
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|
m = 2;
|
|
#ifdef CONFIG_IPV6_ROUTER_PREF
|
|
else if (neigh->nud_state & NUD_FAILED)
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|
m = 0;
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|
#endif
|
|
else
|
|
m = 1;
|
|
read_unlock_bh(&neigh->lock);
|
|
} else
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m = 0;
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return m;
|
|
}
|
|
|
|
static int rt6_score_route(struct rt6_info *rt, int oif,
|
|
int strict)
|
|
{
|
|
int m, n;
|
|
|
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m = rt6_check_dev(rt, oif);
|
|
if (!m && (strict & RT6_LOOKUP_F_IFACE))
|
|
return -1;
|
|
#ifdef CONFIG_IPV6_ROUTER_PREF
|
|
m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
|
|
#endif
|
|
n = rt6_check_neigh(rt);
|
|
if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
|
|
return -1;
|
|
return m;
|
|
}
|
|
|
|
static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
|
|
int *mpri, struct rt6_info *match)
|
|
{
|
|
int m;
|
|
|
|
if (rt6_check_expired(rt))
|
|
goto out;
|
|
|
|
m = rt6_score_route(rt, oif, strict);
|
|
if (m < 0)
|
|
goto out;
|
|
|
|
if (m > *mpri) {
|
|
if (strict & RT6_LOOKUP_F_REACHABLE)
|
|
rt6_probe(match);
|
|
*mpri = m;
|
|
match = rt;
|
|
} else if (strict & RT6_LOOKUP_F_REACHABLE) {
|
|
rt6_probe(rt);
|
|
}
|
|
|
|
out:
|
|
return match;
|
|
}
|
|
|
|
static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
|
|
struct rt6_info *rr_head,
|
|
u32 metric, int oif, int strict)
|
|
{
|
|
struct rt6_info *rt, *match;
|
|
int mpri = -1;
|
|
|
|
match = NULL;
|
|
for (rt = rr_head; rt && rt->rt6i_metric == metric;
|
|
rt = rt->u.dst.rt6_next)
|
|
match = find_match(rt, oif, strict, &mpri, match);
|
|
for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
|
|
rt = rt->u.dst.rt6_next)
|
|
match = find_match(rt, oif, strict, &mpri, match);
|
|
|
|
return match;
|
|
}
|
|
|
|
static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
|
|
{
|
|
struct rt6_info *match, *rt0;
|
|
struct net *net;
|
|
|
|
RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
|
|
__func__, fn->leaf, oif);
|
|
|
|
rt0 = fn->rr_ptr;
|
|
if (!rt0)
|
|
fn->rr_ptr = rt0 = fn->leaf;
|
|
|
|
match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
|
|
|
|
if (!match &&
|
|
(strict & RT6_LOOKUP_F_REACHABLE)) {
|
|
struct rt6_info *next = rt0->u.dst.rt6_next;
|
|
|
|
/* no entries matched; do round-robin */
|
|
if (!next || next->rt6i_metric != rt0->rt6i_metric)
|
|
next = fn->leaf;
|
|
|
|
if (next != rt0)
|
|
fn->rr_ptr = next;
|
|
}
|
|
|
|
RT6_TRACE("%s() => %p\n",
|
|
__func__, match);
|
|
|
|
net = dev_net(rt0->rt6i_dev);
|
|
return (match ? match : net->ipv6.ip6_null_entry);
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_ROUTE_INFO
|
|
int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
|
|
struct in6_addr *gwaddr)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct route_info *rinfo = (struct route_info *) opt;
|
|
struct in6_addr prefix_buf, *prefix;
|
|
unsigned int pref;
|
|
unsigned long lifetime;
|
|
struct rt6_info *rt;
|
|
|
|
if (len < sizeof(struct route_info)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Sanity check for prefix_len and length */
|
|
if (rinfo->length > 3) {
|
|
return -EINVAL;
|
|
} else if (rinfo->prefix_len > 128) {
|
|
return -EINVAL;
|
|
} else if (rinfo->prefix_len > 64) {
|
|
if (rinfo->length < 2) {
|
|
return -EINVAL;
|
|
}
|
|
} else if (rinfo->prefix_len > 0) {
|
|
if (rinfo->length < 1) {
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
pref = rinfo->route_pref;
|
|
if (pref == ICMPV6_ROUTER_PREF_INVALID)
|
|
pref = ICMPV6_ROUTER_PREF_MEDIUM;
|
|
|
|
lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
|
|
|
|
if (rinfo->length == 3)
|
|
prefix = (struct in6_addr *)rinfo->prefix;
|
|
else {
|
|
/* this function is safe */
|
|
ipv6_addr_prefix(&prefix_buf,
|
|
(struct in6_addr *)rinfo->prefix,
|
|
rinfo->prefix_len);
|
|
prefix = &prefix_buf;
|
|
}
|
|
|
|
rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
|
|
dev->ifindex);
|
|
|
|
if (rt && !lifetime) {
|
|
ip6_del_rt(rt);
|
|
rt = NULL;
|
|
}
|
|
|
|
if (!rt && lifetime)
|
|
rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
|
|
pref);
|
|
else if (rt)
|
|
rt->rt6i_flags = RTF_ROUTEINFO |
|
|
(rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
|
|
|
|
if (rt) {
|
|
if (!addrconf_finite_timeout(lifetime)) {
|
|
rt->rt6i_flags &= ~RTF_EXPIRES;
|
|
} else {
|
|
rt->rt6i_expires = jiffies + HZ * lifetime;
|
|
rt->rt6i_flags |= RTF_EXPIRES;
|
|
}
|
|
dst_release(&rt->u.dst);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#define BACKTRACK(__net, saddr) \
|
|
do { \
|
|
if (rt == __net->ipv6.ip6_null_entry) { \
|
|
struct fib6_node *pn; \
|
|
while (1) { \
|
|
if (fn->fn_flags & RTN_TL_ROOT) \
|
|
goto out; \
|
|
pn = fn->parent; \
|
|
if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
|
|
fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
|
|
else \
|
|
fn = pn; \
|
|
if (fn->fn_flags & RTN_RTINFO) \
|
|
goto restart; \
|
|
} \
|
|
} \
|
|
} while(0)
|
|
|
|
static struct rt6_info *ip6_pol_route_lookup(struct net *net,
|
|
struct fib6_table *table,
|
|
struct flowi *fl, int flags)
|
|
{
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt;
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
|
|
restart:
|
|
rt = fn->leaf;
|
|
rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags);
|
|
BACKTRACK(net, &fl->fl6_src);
|
|
out:
|
|
dst_use(&rt->u.dst, jiffies);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
return rt;
|
|
|
|
}
|
|
|
|
struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr, int oif, int strict)
|
|
{
|
|
struct flowi fl = {
|
|
.oif = oif,
|
|
.nl_u = {
|
|
.ip6_u = {
|
|
.daddr = *daddr,
|
|
},
|
|
},
|
|
};
|
|
struct dst_entry *dst;
|
|
int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
|
|
|
|
if (saddr) {
|
|
memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
}
|
|
|
|
dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup);
|
|
if (dst->error == 0)
|
|
return (struct rt6_info *) dst;
|
|
|
|
dst_release(dst);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
EXPORT_SYMBOL(rt6_lookup);
|
|
|
|
/* ip6_ins_rt is called with FREE table->tb6_lock.
|
|
It takes new route entry, the addition fails by any reason the
|
|
route is freed. In any case, if caller does not hold it, it may
|
|
be destroyed.
|
|
*/
|
|
|
|
static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
|
|
{
|
|
int err;
|
|
struct fib6_table *table;
|
|
|
|
table = rt->rt6i_table;
|
|
write_lock_bh(&table->tb6_lock);
|
|
err = fib6_add(&table->tb6_root, rt, info);
|
|
write_unlock_bh(&table->tb6_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int ip6_ins_rt(struct rt6_info *rt)
|
|
{
|
|
struct nl_info info = {
|
|
.nl_net = dev_net(rt->rt6i_dev),
|
|
};
|
|
return __ip6_ins_rt(rt, &info);
|
|
}
|
|
|
|
static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
|
|
struct in6_addr *saddr)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
/*
|
|
* Clone the route.
|
|
*/
|
|
|
|
rt = ip6_rt_copy(ort);
|
|
|
|
if (rt) {
|
|
struct neighbour *neigh;
|
|
int attempts = !in_softirq();
|
|
|
|
if (!(rt->rt6i_flags&RTF_GATEWAY)) {
|
|
if (rt->rt6i_dst.plen != 128 &&
|
|
ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
|
|
rt->rt6i_flags |= RTF_ANYCAST;
|
|
ipv6_addr_copy(&rt->rt6i_gateway, daddr);
|
|
}
|
|
|
|
ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
|
|
rt->rt6i_dst.plen = 128;
|
|
rt->rt6i_flags |= RTF_CACHE;
|
|
rt->u.dst.flags |= DST_HOST;
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (rt->rt6i_src.plen && saddr) {
|
|
ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
|
|
rt->rt6i_src.plen = 128;
|
|
}
|
|
#endif
|
|
|
|
retry:
|
|
neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
|
|
if (IS_ERR(neigh)) {
|
|
struct net *net = dev_net(rt->rt6i_dev);
|
|
int saved_rt_min_interval =
|
|
net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
int saved_rt_elasticity =
|
|
net->ipv6.sysctl.ip6_rt_gc_elasticity;
|
|
|
|
if (attempts-- > 0) {
|
|
net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
|
|
net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;
|
|
|
|
ip6_dst_gc(net->ipv6.ip6_dst_ops);
|
|
|
|
net->ipv6.sysctl.ip6_rt_gc_elasticity =
|
|
saved_rt_elasticity;
|
|
net->ipv6.sysctl.ip6_rt_gc_min_interval =
|
|
saved_rt_min_interval;
|
|
goto retry;
|
|
}
|
|
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING
|
|
"Neighbour table overflow.\n");
|
|
dst_free(&rt->u.dst);
|
|
return NULL;
|
|
}
|
|
rt->rt6i_nexthop = neigh;
|
|
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
|
|
static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
|
|
{
|
|
struct rt6_info *rt = ip6_rt_copy(ort);
|
|
if (rt) {
|
|
ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
|
|
rt->rt6i_dst.plen = 128;
|
|
rt->rt6i_flags |= RTF_CACHE;
|
|
rt->u.dst.flags |= DST_HOST;
|
|
rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
|
|
}
|
|
return rt;
|
|
}
|
|
|
|
static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
|
|
struct flowi *fl, int flags)
|
|
{
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt, *nrt;
|
|
int strict = 0;
|
|
int attempts = 3;
|
|
int err;
|
|
int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
|
|
|
|
strict |= flags & RT6_LOOKUP_F_IFACE;
|
|
|
|
relookup:
|
|
read_lock_bh(&table->tb6_lock);
|
|
|
|
restart_2:
|
|
fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
|
|
|
|
restart:
|
|
rt = rt6_select(fn, oif, strict | reachable);
|
|
|
|
BACKTRACK(net, &fl->fl6_src);
|
|
if (rt == net->ipv6.ip6_null_entry ||
|
|
rt->rt6i_flags & RTF_CACHE)
|
|
goto out;
|
|
|
|
dst_hold(&rt->u.dst);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
|
|
nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
|
|
else {
|
|
#if CLONE_OFFLINK_ROUTE
|
|
nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
|
|
#else
|
|
goto out2;
|
|
#endif
|
|
}
|
|
|
|
dst_release(&rt->u.dst);
|
|
rt = nrt ? : net->ipv6.ip6_null_entry;
|
|
|
|
dst_hold(&rt->u.dst);
|
|
if (nrt) {
|
|
err = ip6_ins_rt(nrt);
|
|
if (!err)
|
|
goto out2;
|
|
}
|
|
|
|
if (--attempts <= 0)
|
|
goto out2;
|
|
|
|
/*
|
|
* Race condition! In the gap, when table->tb6_lock was
|
|
* released someone could insert this route. Relookup.
|
|
*/
|
|
dst_release(&rt->u.dst);
|
|
goto relookup;
|
|
|
|
out:
|
|
if (reachable) {
|
|
reachable = 0;
|
|
goto restart_2;
|
|
}
|
|
dst_hold(&rt->u.dst);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
out2:
|
|
rt->u.dst.lastuse = jiffies;
|
|
rt->u.dst.__use++;
|
|
|
|
return rt;
|
|
}
|
|
|
|
static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
|
|
struct flowi *fl, int flags)
|
|
{
|
|
return ip6_pol_route(net, table, fl->iif, fl, flags);
|
|
}
|
|
|
|
void ip6_route_input(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
struct net *net = dev_net(skb->dev);
|
|
int flags = RT6_LOOKUP_F_HAS_SADDR;
|
|
struct flowi fl = {
|
|
.iif = skb->dev->ifindex,
|
|
.nl_u = {
|
|
.ip6_u = {
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
|
|
},
|
|
},
|
|
.mark = skb->mark,
|
|
.proto = iph->nexthdr,
|
|
};
|
|
|
|
if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG)
|
|
flags |= RT6_LOOKUP_F_IFACE;
|
|
|
|
skb_dst_set(skb, fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input));
|
|
}
|
|
|
|
static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
|
|
struct flowi *fl, int flags)
|
|
{
|
|
return ip6_pol_route(net, table, fl->oif, fl, flags);
|
|
}
|
|
|
|
struct dst_entry * ip6_route_output(struct net *net, struct sock *sk,
|
|
struct flowi *fl)
|
|
{
|
|
int flags = 0;
|
|
|
|
if (rt6_need_strict(&fl->fl6_dst))
|
|
flags |= RT6_LOOKUP_F_IFACE;
|
|
|
|
if (!ipv6_addr_any(&fl->fl6_src))
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
else if (sk) {
|
|
unsigned int prefs = inet6_sk(sk)->srcprefs;
|
|
if (prefs & IPV6_PREFER_SRC_TMP)
|
|
flags |= RT6_LOOKUP_F_SRCPREF_TMP;
|
|
if (prefs & IPV6_PREFER_SRC_PUBLIC)
|
|
flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC;
|
|
if (prefs & IPV6_PREFER_SRC_COA)
|
|
flags |= RT6_LOOKUP_F_SRCPREF_COA;
|
|
}
|
|
|
|
return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output);
|
|
}
|
|
|
|
EXPORT_SYMBOL(ip6_route_output);
|
|
|
|
int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
|
|
{
|
|
struct rt6_info *ort = (struct rt6_info *) *dstp;
|
|
struct rt6_info *rt = (struct rt6_info *)
|
|
dst_alloc(&ip6_dst_blackhole_ops);
|
|
struct dst_entry *new = NULL;
|
|
|
|
if (rt) {
|
|
new = &rt->u.dst;
|
|
|
|
atomic_set(&new->__refcnt, 1);
|
|
new->__use = 1;
|
|
new->input = dst_discard;
|
|
new->output = dst_discard;
|
|
|
|
memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
|
|
new->dev = ort->u.dst.dev;
|
|
if (new->dev)
|
|
dev_hold(new->dev);
|
|
rt->rt6i_idev = ort->rt6i_idev;
|
|
if (rt->rt6i_idev)
|
|
in6_dev_hold(rt->rt6i_idev);
|
|
rt->rt6i_expires = 0;
|
|
|
|
ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
|
|
rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
|
|
rt->rt6i_metric = 0;
|
|
|
|
memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
|
|
#endif
|
|
|
|
dst_free(new);
|
|
}
|
|
|
|
dst_release(*dstp);
|
|
*dstp = new;
|
|
return (new ? 0 : -ENOMEM);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_dst_blackhole);
|
|
|
|
/*
|
|
* Destination cache support functions
|
|
*/
|
|
|
|
static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
rt = (struct rt6_info *) dst;
|
|
|
|
if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
|
|
return dst;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
|
|
{
|
|
struct rt6_info *rt = (struct rt6_info *) dst;
|
|
|
|
if (rt) {
|
|
if (rt->rt6i_flags & RTF_CACHE)
|
|
ip6_del_rt(rt);
|
|
else
|
|
dst_release(dst);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void ip6_link_failure(struct sk_buff *skb)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
|
|
|
|
rt = (struct rt6_info *) skb_dst(skb);
|
|
if (rt) {
|
|
if (rt->rt6i_flags&RTF_CACHE) {
|
|
dst_set_expires(&rt->u.dst, 0);
|
|
rt->rt6i_flags |= RTF_EXPIRES;
|
|
} else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
|
|
rt->rt6i_node->fn_sernum = -1;
|
|
}
|
|
}
|
|
|
|
static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|
{
|
|
struct rt6_info *rt6 = (struct rt6_info*)dst;
|
|
|
|
if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
|
|
rt6->rt6i_flags |= RTF_MODIFIED;
|
|
if (mtu < IPV6_MIN_MTU) {
|
|
mtu = IPV6_MIN_MTU;
|
|
dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
|
|
}
|
|
dst->metrics[RTAX_MTU-1] = mtu;
|
|
call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
|
|
}
|
|
}
|
|
|
|
static int ipv6_get_mtu(struct net_device *dev);
|
|
|
|
static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu)
|
|
{
|
|
mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
|
|
|
|
if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
|
|
mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
|
|
|
|
/*
|
|
* Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
|
|
* corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
|
|
* IPV6_MAXPLEN is also valid and means: "any MSS,
|
|
* rely only on pmtu discovery"
|
|
*/
|
|
if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
|
|
mtu = IPV6_MAXPLEN;
|
|
return mtu;
|
|
}
|
|
|
|
static struct dst_entry *icmp6_dst_gc_list;
|
|
static DEFINE_SPINLOCK(icmp6_dst_lock);
|
|
|
|
struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
|
|
struct neighbour *neigh,
|
|
const struct in6_addr *addr)
|
|
{
|
|
struct rt6_info *rt;
|
|
struct inet6_dev *idev = in6_dev_get(dev);
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (unlikely(idev == NULL))
|
|
return NULL;
|
|
|
|
rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
|
|
if (unlikely(rt == NULL)) {
|
|
in6_dev_put(idev);
|
|
goto out;
|
|
}
|
|
|
|
dev_hold(dev);
|
|
if (neigh)
|
|
neigh_hold(neigh);
|
|
else {
|
|
neigh = ndisc_get_neigh(dev, addr);
|
|
if (IS_ERR(neigh))
|
|
neigh = NULL;
|
|
}
|
|
|
|
rt->rt6i_dev = dev;
|
|
rt->rt6i_idev = idev;
|
|
rt->rt6i_nexthop = neigh;
|
|
atomic_set(&rt->u.dst.__refcnt, 1);
|
|
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
|
|
rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
|
|
rt->u.dst.output = ip6_output;
|
|
|
|
#if 0 /* there's no chance to use these for ndisc */
|
|
rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
|
|
? DST_HOST
|
|
: 0;
|
|
ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
|
|
rt->rt6i_dst.plen = 128;
|
|
#endif
|
|
|
|
spin_lock_bh(&icmp6_dst_lock);
|
|
rt->u.dst.next = icmp6_dst_gc_list;
|
|
icmp6_dst_gc_list = &rt->u.dst;
|
|
spin_unlock_bh(&icmp6_dst_lock);
|
|
|
|
fib6_force_start_gc(net);
|
|
|
|
out:
|
|
return &rt->u.dst;
|
|
}
|
|
|
|
int icmp6_dst_gc(void)
|
|
{
|
|
struct dst_entry *dst, *next, **pprev;
|
|
int more = 0;
|
|
|
|
next = NULL;
|
|
|
|
spin_lock_bh(&icmp6_dst_lock);
|
|
pprev = &icmp6_dst_gc_list;
|
|
|
|
while ((dst = *pprev) != NULL) {
|
|
if (!atomic_read(&dst->__refcnt)) {
|
|
*pprev = dst->next;
|
|
dst_free(dst);
|
|
} else {
|
|
pprev = &dst->next;
|
|
++more;
|
|
}
|
|
}
|
|
|
|
spin_unlock_bh(&icmp6_dst_lock);
|
|
|
|
return more;
|
|
}
|
|
|
|
static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
|
|
void *arg)
|
|
{
|
|
struct dst_entry *dst, **pprev;
|
|
|
|
spin_lock_bh(&icmp6_dst_lock);
|
|
pprev = &icmp6_dst_gc_list;
|
|
while ((dst = *pprev) != NULL) {
|
|
struct rt6_info *rt = (struct rt6_info *) dst;
|
|
if (func(rt, arg)) {
|
|
*pprev = dst->next;
|
|
dst_free(dst);
|
|
} else {
|
|
pprev = &dst->next;
|
|
}
|
|
}
|
|
spin_unlock_bh(&icmp6_dst_lock);
|
|
}
|
|
|
|
static int ip6_dst_gc(struct dst_ops *ops)
|
|
{
|
|
unsigned long now = jiffies;
|
|
struct net *net = ops->dst_net;
|
|
int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
|
|
int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
|
|
int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
|
|
unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
|
|
|
|
if (time_after(rt_last_gc + rt_min_interval, now) &&
|
|
atomic_read(&ops->entries) <= rt_max_size)
|
|
goto out;
|
|
|
|
net->ipv6.ip6_rt_gc_expire++;
|
|
fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
|
|
net->ipv6.ip6_rt_last_gc = now;
|
|
if (atomic_read(&ops->entries) < ops->gc_thresh)
|
|
net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
|
|
out:
|
|
net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
|
|
return (atomic_read(&ops->entries) > rt_max_size);
|
|
}
|
|
|
|
/* Clean host part of a prefix. Not necessary in radix tree,
|
|
but results in cleaner routing tables.
|
|
|
|
Remove it only when all the things will work!
|
|
*/
|
|
|
|
static int ipv6_get_mtu(struct net_device *dev)
|
|
{
|
|
int mtu = IPV6_MIN_MTU;
|
|
struct inet6_dev *idev;
|
|
|
|
idev = in6_dev_get(dev);
|
|
if (idev) {
|
|
mtu = idev->cnf.mtu6;
|
|
in6_dev_put(idev);
|
|
}
|
|
return mtu;
|
|
}
|
|
|
|
int ip6_dst_hoplimit(struct dst_entry *dst)
|
|
{
|
|
int hoplimit = dst_metric(dst, RTAX_HOPLIMIT);
|
|
if (hoplimit < 0) {
|
|
struct net_device *dev = dst->dev;
|
|
struct inet6_dev *idev = in6_dev_get(dev);
|
|
if (idev) {
|
|
hoplimit = idev->cnf.hop_limit;
|
|
in6_dev_put(idev);
|
|
} else
|
|
hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
|
|
}
|
|
return hoplimit;
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
int ip6_route_add(struct fib6_config *cfg)
|
|
{
|
|
int err;
|
|
struct net *net = cfg->fc_nlinfo.nl_net;
|
|
struct rt6_info *rt = NULL;
|
|
struct net_device *dev = NULL;
|
|
struct inet6_dev *idev = NULL;
|
|
struct fib6_table *table;
|
|
int addr_type;
|
|
|
|
if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
|
|
return -EINVAL;
|
|
#ifndef CONFIG_IPV6_SUBTREES
|
|
if (cfg->fc_src_len)
|
|
return -EINVAL;
|
|
#endif
|
|
if (cfg->fc_ifindex) {
|
|
err = -ENODEV;
|
|
dev = dev_get_by_index(net, cfg->fc_ifindex);
|
|
if (!dev)
|
|
goto out;
|
|
idev = in6_dev_get(dev);
|
|
if (!idev)
|
|
goto out;
|
|
}
|
|
|
|
if (cfg->fc_metric == 0)
|
|
cfg->fc_metric = IP6_RT_PRIO_USER;
|
|
|
|
table = fib6_new_table(net, cfg->fc_table);
|
|
if (table == NULL) {
|
|
err = -ENOBUFS;
|
|
goto out;
|
|
}
|
|
|
|
rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
|
|
|
|
if (rt == NULL) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
rt->u.dst.obsolete = -1;
|
|
rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ?
|
|
jiffies + clock_t_to_jiffies(cfg->fc_expires) :
|
|
0;
|
|
|
|
if (cfg->fc_protocol == RTPROT_UNSPEC)
|
|
cfg->fc_protocol = RTPROT_BOOT;
|
|
rt->rt6i_protocol = cfg->fc_protocol;
|
|
|
|
addr_type = ipv6_addr_type(&cfg->fc_dst);
|
|
|
|
if (addr_type & IPV6_ADDR_MULTICAST)
|
|
rt->u.dst.input = ip6_mc_input;
|
|
else
|
|
rt->u.dst.input = ip6_forward;
|
|
|
|
rt->u.dst.output = ip6_output;
|
|
|
|
ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
|
|
rt->rt6i_dst.plen = cfg->fc_dst_len;
|
|
if (rt->rt6i_dst.plen == 128)
|
|
rt->u.dst.flags = DST_HOST;
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
|
|
rt->rt6i_src.plen = cfg->fc_src_len;
|
|
#endif
|
|
|
|
rt->rt6i_metric = cfg->fc_metric;
|
|
|
|
/* We cannot add true routes via loopback here,
|
|
they would result in kernel looping; promote them to reject routes
|
|
*/
|
|
if ((cfg->fc_flags & RTF_REJECT) ||
|
|
(dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
|
|
/* hold loopback dev/idev if we haven't done so. */
|
|
if (dev != net->loopback_dev) {
|
|
if (dev) {
|
|
dev_put(dev);
|
|
in6_dev_put(idev);
|
|
}
|
|
dev = net->loopback_dev;
|
|
dev_hold(dev);
|
|
idev = in6_dev_get(dev);
|
|
if (!idev) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
}
|
|
rt->u.dst.output = ip6_pkt_discard_out;
|
|
rt->u.dst.input = ip6_pkt_discard;
|
|
rt->u.dst.error = -ENETUNREACH;
|
|
rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
|
|
goto install_route;
|
|
}
|
|
|
|
if (cfg->fc_flags & RTF_GATEWAY) {
|
|
struct in6_addr *gw_addr;
|
|
int gwa_type;
|
|
|
|
gw_addr = &cfg->fc_gateway;
|
|
ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
|
|
gwa_type = ipv6_addr_type(gw_addr);
|
|
|
|
if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
|
|
struct rt6_info *grt;
|
|
|
|
/* IPv6 strictly inhibits using not link-local
|
|
addresses as nexthop address.
|
|
Otherwise, router will not able to send redirects.
|
|
It is very good, but in some (rare!) circumstances
|
|
(SIT, PtP, NBMA NOARP links) it is handy to allow
|
|
some exceptions. --ANK
|
|
*/
|
|
err = -EINVAL;
|
|
if (!(gwa_type&IPV6_ADDR_UNICAST))
|
|
goto out;
|
|
|
|
grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
|
|
|
|
err = -EHOSTUNREACH;
|
|
if (grt == NULL)
|
|
goto out;
|
|
if (dev) {
|
|
if (dev != grt->rt6i_dev) {
|
|
dst_release(&grt->u.dst);
|
|
goto out;
|
|
}
|
|
} else {
|
|
dev = grt->rt6i_dev;
|
|
idev = grt->rt6i_idev;
|
|
dev_hold(dev);
|
|
in6_dev_hold(grt->rt6i_idev);
|
|
}
|
|
if (!(grt->rt6i_flags&RTF_GATEWAY))
|
|
err = 0;
|
|
dst_release(&grt->u.dst);
|
|
|
|
if (err)
|
|
goto out;
|
|
}
|
|
err = -EINVAL;
|
|
if (dev == NULL || (dev->flags&IFF_LOOPBACK))
|
|
goto out;
|
|
}
|
|
|
|
err = -ENODEV;
|
|
if (dev == NULL)
|
|
goto out;
|
|
|
|
if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
|
|
rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
|
|
if (IS_ERR(rt->rt6i_nexthop)) {
|
|
err = PTR_ERR(rt->rt6i_nexthop);
|
|
rt->rt6i_nexthop = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
rt->rt6i_flags = cfg->fc_flags;
|
|
|
|
install_route:
|
|
if (cfg->fc_mx) {
|
|
struct nlattr *nla;
|
|
int remaining;
|
|
|
|
nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
|
|
int type = nla_type(nla);
|
|
|
|
if (type) {
|
|
if (type > RTAX_MAX) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
rt->u.dst.metrics[type - 1] = nla_get_u32(nla);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0)
|
|
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
|
|
if (!dst_mtu(&rt->u.dst))
|
|
rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
|
|
if (!dst_metric(&rt->u.dst, RTAX_ADVMSS))
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
|
|
rt->u.dst.dev = dev;
|
|
rt->rt6i_idev = idev;
|
|
rt->rt6i_table = table;
|
|
|
|
cfg->fc_nlinfo.nl_net = dev_net(dev);
|
|
|
|
return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
|
|
|
|
out:
|
|
if (dev)
|
|
dev_put(dev);
|
|
if (idev)
|
|
in6_dev_put(idev);
|
|
if (rt)
|
|
dst_free(&rt->u.dst);
|
|
return err;
|
|
}
|
|
|
|
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
|
|
{
|
|
int err;
|
|
struct fib6_table *table;
|
|
struct net *net = dev_net(rt->rt6i_dev);
|
|
|
|
if (rt == net->ipv6.ip6_null_entry)
|
|
return -ENOENT;
|
|
|
|
table = rt->rt6i_table;
|
|
write_lock_bh(&table->tb6_lock);
|
|
|
|
err = fib6_del(rt, info);
|
|
dst_release(&rt->u.dst);
|
|
|
|
write_unlock_bh(&table->tb6_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int ip6_del_rt(struct rt6_info *rt)
|
|
{
|
|
struct nl_info info = {
|
|
.nl_net = dev_net(rt->rt6i_dev),
|
|
};
|
|
return __ip6_del_rt(rt, &info);
|
|
}
|
|
|
|
static int ip6_route_del(struct fib6_config *cfg)
|
|
{
|
|
struct fib6_table *table;
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt;
|
|
int err = -ESRCH;
|
|
|
|
table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
|
|
if (table == NULL)
|
|
return err;
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
|
|
fn = fib6_locate(&table->tb6_root,
|
|
&cfg->fc_dst, cfg->fc_dst_len,
|
|
&cfg->fc_src, cfg->fc_src_len);
|
|
|
|
if (fn) {
|
|
for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
|
|
if (cfg->fc_ifindex &&
|
|
(rt->rt6i_dev == NULL ||
|
|
rt->rt6i_dev->ifindex != cfg->fc_ifindex))
|
|
continue;
|
|
if (cfg->fc_flags & RTF_GATEWAY &&
|
|
!ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
|
|
continue;
|
|
if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
|
|
continue;
|
|
dst_hold(&rt->u.dst);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
return __ip6_del_rt(rt, &cfg->fc_nlinfo);
|
|
}
|
|
}
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Handle redirects
|
|
*/
|
|
struct ip6rd_flowi {
|
|
struct flowi fl;
|
|
struct in6_addr gateway;
|
|
};
|
|
|
|
static struct rt6_info *__ip6_route_redirect(struct net *net,
|
|
struct fib6_table *table,
|
|
struct flowi *fl,
|
|
int flags)
|
|
{
|
|
struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
|
|
struct rt6_info *rt;
|
|
struct fib6_node *fn;
|
|
|
|
/*
|
|
* Get the "current" route for this destination and
|
|
* check if the redirect has come from approriate router.
|
|
*
|
|
* RFC 2461 specifies that redirects should only be
|
|
* accepted if they come from the nexthop to the target.
|
|
* Due to the way the routes are chosen, this notion
|
|
* is a bit fuzzy and one might need to check all possible
|
|
* routes.
|
|
*/
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
|
|
restart:
|
|
for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
|
|
/*
|
|
* Current route is on-link; redirect is always invalid.
|
|
*
|
|
* Seems, previous statement is not true. It could
|
|
* be node, which looks for us as on-link (f.e. proxy ndisc)
|
|
* But then router serving it might decide, that we should
|
|
* know truth 8)8) --ANK (980726).
|
|
*/
|
|
if (rt6_check_expired(rt))
|
|
continue;
|
|
if (!(rt->rt6i_flags & RTF_GATEWAY))
|
|
continue;
|
|
if (fl->oif != rt->rt6i_dev->ifindex)
|
|
continue;
|
|
if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
if (!rt)
|
|
rt = net->ipv6.ip6_null_entry;
|
|
BACKTRACK(net, &fl->fl6_src);
|
|
out:
|
|
dst_hold(&rt->u.dst);
|
|
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
return rt;
|
|
};
|
|
|
|
static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
|
|
struct in6_addr *src,
|
|
struct in6_addr *gateway,
|
|
struct net_device *dev)
|
|
{
|
|
int flags = RT6_LOOKUP_F_HAS_SADDR;
|
|
struct net *net = dev_net(dev);
|
|
struct ip6rd_flowi rdfl = {
|
|
.fl = {
|
|
.oif = dev->ifindex,
|
|
.nl_u = {
|
|
.ip6_u = {
|
|
.daddr = *dest,
|
|
.saddr = *src,
|
|
},
|
|
},
|
|
},
|
|
.gateway = *gateway,
|
|
};
|
|
|
|
if (rt6_need_strict(dest))
|
|
flags |= RT6_LOOKUP_F_IFACE;
|
|
|
|
return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl,
|
|
flags, __ip6_route_redirect);
|
|
}
|
|
|
|
void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,
|
|
struct in6_addr *saddr,
|
|
struct neighbour *neigh, u8 *lladdr, int on_link)
|
|
{
|
|
struct rt6_info *rt, *nrt = NULL;
|
|
struct netevent_redirect netevent;
|
|
struct net *net = dev_net(neigh->dev);
|
|
|
|
rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
|
|
|
|
if (rt == net->ipv6.ip6_null_entry) {
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
|
|
"for redirect target\n");
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We have finally decided to accept it.
|
|
*/
|
|
|
|
neigh_update(neigh, lladdr, NUD_STALE,
|
|
NEIGH_UPDATE_F_WEAK_OVERRIDE|
|
|
NEIGH_UPDATE_F_OVERRIDE|
|
|
(on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
|
|
NEIGH_UPDATE_F_ISROUTER))
|
|
);
|
|
|
|
/*
|
|
* Redirect received -> path was valid.
|
|
* Look, redirects are sent only in response to data packets,
|
|
* so that this nexthop apparently is reachable. --ANK
|
|
*/
|
|
dst_confirm(&rt->u.dst);
|
|
|
|
/* Duplicate redirect: silently ignore. */
|
|
if (neigh == rt->u.dst.neighbour)
|
|
goto out;
|
|
|
|
nrt = ip6_rt_copy(rt);
|
|
if (nrt == NULL)
|
|
goto out;
|
|
|
|
nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
|
|
if (on_link)
|
|
nrt->rt6i_flags &= ~RTF_GATEWAY;
|
|
|
|
ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
|
|
nrt->rt6i_dst.plen = 128;
|
|
nrt->u.dst.flags |= DST_HOST;
|
|
|
|
ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
|
|
nrt->rt6i_nexthop = neigh_clone(neigh);
|
|
/* Reset pmtu, it may be better */
|
|
nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
|
|
nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev),
|
|
dst_mtu(&nrt->u.dst));
|
|
|
|
if (ip6_ins_rt(nrt))
|
|
goto out;
|
|
|
|
netevent.old = &rt->u.dst;
|
|
netevent.new = &nrt->u.dst;
|
|
call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
|
|
|
|
if (rt->rt6i_flags&RTF_CACHE) {
|
|
ip6_del_rt(rt);
|
|
return;
|
|
}
|
|
|
|
out:
|
|
dst_release(&rt->u.dst);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Handle ICMP "packet too big" messages
|
|
* i.e. Path MTU discovery
|
|
*/
|
|
|
|
void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
|
|
struct net_device *dev, u32 pmtu)
|
|
{
|
|
struct rt6_info *rt, *nrt;
|
|
struct net *net = dev_net(dev);
|
|
int allfrag = 0;
|
|
|
|
rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0);
|
|
if (rt == NULL)
|
|
return;
|
|
|
|
if (pmtu >= dst_mtu(&rt->u.dst))
|
|
goto out;
|
|
|
|
if (pmtu < IPV6_MIN_MTU) {
|
|
/*
|
|
* According to RFC2460, PMTU is set to the IPv6 Minimum Link
|
|
* MTU (1280) and a fragment header should always be included
|
|
* after a node receiving Too Big message reporting PMTU is
|
|
* less than the IPv6 Minimum Link MTU.
|
|
*/
|
|
pmtu = IPV6_MIN_MTU;
|
|
allfrag = 1;
|
|
}
|
|
|
|
/* New mtu received -> path was valid.
|
|
They are sent only in response to data packets,
|
|
so that this nexthop apparently is reachable. --ANK
|
|
*/
|
|
dst_confirm(&rt->u.dst);
|
|
|
|
/* Host route. If it is static, it would be better
|
|
not to override it, but add new one, so that
|
|
when cache entry will expire old pmtu
|
|
would return automatically.
|
|
*/
|
|
if (rt->rt6i_flags & RTF_CACHE) {
|
|
rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
|
|
if (allfrag)
|
|
rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
|
|
dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
|
|
rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
|
|
goto out;
|
|
}
|
|
|
|
/* Network route.
|
|
Two cases are possible:
|
|
1. It is connected route. Action: COW
|
|
2. It is gatewayed route or NONEXTHOP route. Action: clone it.
|
|
*/
|
|
if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
|
|
nrt = rt6_alloc_cow(rt, daddr, saddr);
|
|
else
|
|
nrt = rt6_alloc_clone(rt, daddr);
|
|
|
|
if (nrt) {
|
|
nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
|
|
if (allfrag)
|
|
nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
|
|
|
|
/* According to RFC 1981, detecting PMTU increase shouldn't be
|
|
* happened within 5 mins, the recommended timer is 10 mins.
|
|
* Here this route expiration time is set to ip6_rt_mtu_expires
|
|
* which is 10 mins. After 10 mins the decreased pmtu is expired
|
|
* and detecting PMTU increase will be automatically happened.
|
|
*/
|
|
dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
|
|
nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
|
|
|
|
ip6_ins_rt(nrt);
|
|
}
|
|
out:
|
|
dst_release(&rt->u.dst);
|
|
}
|
|
|
|
/*
|
|
* Misc support functions
|
|
*/
|
|
|
|
static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
|
|
{
|
|
struct net *net = dev_net(ort->rt6i_dev);
|
|
struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
|
|
|
|
if (rt) {
|
|
rt->u.dst.input = ort->u.dst.input;
|
|
rt->u.dst.output = ort->u.dst.output;
|
|
|
|
memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
|
|
rt->u.dst.error = ort->u.dst.error;
|
|
rt->u.dst.dev = ort->u.dst.dev;
|
|
if (rt->u.dst.dev)
|
|
dev_hold(rt->u.dst.dev);
|
|
rt->rt6i_idev = ort->rt6i_idev;
|
|
if (rt->rt6i_idev)
|
|
in6_dev_hold(rt->rt6i_idev);
|
|
rt->u.dst.lastuse = jiffies;
|
|
rt->rt6i_expires = 0;
|
|
|
|
ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
|
|
rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
|
|
rt->rt6i_metric = 0;
|
|
|
|
memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
|
|
#endif
|
|
rt->rt6i_table = ort->rt6i_table;
|
|
}
|
|
return rt;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_ROUTE_INFO
|
|
static struct rt6_info *rt6_get_route_info(struct net *net,
|
|
struct in6_addr *prefix, int prefixlen,
|
|
struct in6_addr *gwaddr, int ifindex)
|
|
{
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt = NULL;
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(net, RT6_TABLE_INFO);
|
|
if (table == NULL)
|
|
return NULL;
|
|
|
|
write_lock_bh(&table->tb6_lock);
|
|
fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
|
|
if (!fn)
|
|
goto out;
|
|
|
|
for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
|
|
if (rt->rt6i_dev->ifindex != ifindex)
|
|
continue;
|
|
if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
|
|
continue;
|
|
if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
|
|
continue;
|
|
dst_hold(&rt->u.dst);
|
|
break;
|
|
}
|
|
out:
|
|
write_unlock_bh(&table->tb6_lock);
|
|
return rt;
|
|
}
|
|
|
|
static struct rt6_info *rt6_add_route_info(struct net *net,
|
|
struct in6_addr *prefix, int prefixlen,
|
|
struct in6_addr *gwaddr, int ifindex,
|
|
unsigned pref)
|
|
{
|
|
struct fib6_config cfg = {
|
|
.fc_table = RT6_TABLE_INFO,
|
|
.fc_metric = IP6_RT_PRIO_USER,
|
|
.fc_ifindex = ifindex,
|
|
.fc_dst_len = prefixlen,
|
|
.fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
|
|
RTF_UP | RTF_PREF(pref),
|
|
.fc_nlinfo.pid = 0,
|
|
.fc_nlinfo.nlh = NULL,
|
|
.fc_nlinfo.nl_net = net,
|
|
};
|
|
|
|
ipv6_addr_copy(&cfg.fc_dst, prefix);
|
|
ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
|
|
|
|
/* We should treat it as a default route if prefix length is 0. */
|
|
if (!prefixlen)
|
|
cfg.fc_flags |= RTF_DEFAULT;
|
|
|
|
ip6_route_add(&cfg);
|
|
|
|
return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
|
|
}
|
|
#endif
|
|
|
|
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
|
|
{
|
|
struct rt6_info *rt;
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
|
|
if (table == NULL)
|
|
return NULL;
|
|
|
|
write_lock_bh(&table->tb6_lock);
|
|
for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
|
|
if (dev == rt->rt6i_dev &&
|
|
((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
|
|
ipv6_addr_equal(&rt->rt6i_gateway, addr))
|
|
break;
|
|
}
|
|
if (rt)
|
|
dst_hold(&rt->u.dst);
|
|
write_unlock_bh(&table->tb6_lock);
|
|
return rt;
|
|
}
|
|
|
|
struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
|
|
struct net_device *dev,
|
|
unsigned int pref)
|
|
{
|
|
struct fib6_config cfg = {
|
|
.fc_table = RT6_TABLE_DFLT,
|
|
.fc_metric = IP6_RT_PRIO_USER,
|
|
.fc_ifindex = dev->ifindex,
|
|
.fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
|
|
RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
|
|
.fc_nlinfo.pid = 0,
|
|
.fc_nlinfo.nlh = NULL,
|
|
.fc_nlinfo.nl_net = dev_net(dev),
|
|
};
|
|
|
|
ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
|
|
|
|
ip6_route_add(&cfg);
|
|
|
|
return rt6_get_dflt_router(gwaddr, dev);
|
|
}
|
|
|
|
void rt6_purge_dflt_routers(struct net *net)
|
|
{
|
|
struct rt6_info *rt;
|
|
struct fib6_table *table;
|
|
|
|
/* NOTE: Keep consistent with rt6_get_dflt_router */
|
|
table = fib6_get_table(net, RT6_TABLE_DFLT);
|
|
if (table == NULL)
|
|
return;
|
|
|
|
restart:
|
|
read_lock_bh(&table->tb6_lock);
|
|
for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
|
|
if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
|
|
dst_hold(&rt->u.dst);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
ip6_del_rt(rt);
|
|
goto restart;
|
|
}
|
|
}
|
|
read_unlock_bh(&table->tb6_lock);
|
|
}
|
|
|
|
static void rtmsg_to_fib6_config(struct net *net,
|
|
struct in6_rtmsg *rtmsg,
|
|
struct fib6_config *cfg)
|
|
{
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
|
|
cfg->fc_table = RT6_TABLE_MAIN;
|
|
cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
|
|
cfg->fc_metric = rtmsg->rtmsg_metric;
|
|
cfg->fc_expires = rtmsg->rtmsg_info;
|
|
cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
|
|
cfg->fc_src_len = rtmsg->rtmsg_src_len;
|
|
cfg->fc_flags = rtmsg->rtmsg_flags;
|
|
|
|
cfg->fc_nlinfo.nl_net = net;
|
|
|
|
ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
|
|
ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
|
|
ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
|
|
}
|
|
|
|
int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct fib6_config cfg;
|
|
struct in6_rtmsg rtmsg;
|
|
int err;
|
|
|
|
switch(cmd) {
|
|
case SIOCADDRT: /* Add a route */
|
|
case SIOCDELRT: /* Delete a route */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
err = copy_from_user(&rtmsg, arg,
|
|
sizeof(struct in6_rtmsg));
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
rtmsg_to_fib6_config(net, &rtmsg, &cfg);
|
|
|
|
rtnl_lock();
|
|
switch (cmd) {
|
|
case SIOCADDRT:
|
|
err = ip6_route_add(&cfg);
|
|
break;
|
|
case SIOCDELRT:
|
|
err = ip6_route_del(&cfg);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Drop the packet on the floor
|
|
*/
|
|
|
|
static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes)
|
|
{
|
|
int type;
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
switch (ipstats_mib_noroutes) {
|
|
case IPSTATS_MIB_INNOROUTES:
|
|
type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
|
|
if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
|
|
IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
|
|
IPSTATS_MIB_INADDRERRORS);
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case IPSTATS_MIB_OUTNOROUTES:
|
|
IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
|
|
ipstats_mib_noroutes);
|
|
break;
|
|
}
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_pkt_discard(struct sk_buff *skb)
|
|
{
|
|
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
|
|
}
|
|
|
|
static int ip6_pkt_discard_out(struct sk_buff *skb)
|
|
{
|
|
skb->dev = skb_dst(skb)->dev;
|
|
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
|
|
static int ip6_pkt_prohibit(struct sk_buff *skb)
|
|
{
|
|
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
|
|
}
|
|
|
|
static int ip6_pkt_prohibit_out(struct sk_buff *skb)
|
|
{
|
|
skb->dev = skb_dst(skb)->dev;
|
|
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Allocate a dst for local (unicast / anycast) address.
|
|
*/
|
|
|
|
struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
|
|
const struct in6_addr *addr,
|
|
int anycast)
|
|
{
|
|
struct net *net = dev_net(idev->dev);
|
|
struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
|
|
struct neighbour *neigh;
|
|
|
|
if (rt == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
dev_hold(net->loopback_dev);
|
|
in6_dev_hold(idev);
|
|
|
|
rt->u.dst.flags = DST_HOST;
|
|
rt->u.dst.input = ip6_input;
|
|
rt->u.dst.output = ip6_output;
|
|
rt->rt6i_dev = net->loopback_dev;
|
|
rt->rt6i_idev = idev;
|
|
rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
|
|
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
|
|
rt->u.dst.obsolete = -1;
|
|
|
|
rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
|
|
if (anycast)
|
|
rt->rt6i_flags |= RTF_ANYCAST;
|
|
else
|
|
rt->rt6i_flags |= RTF_LOCAL;
|
|
neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
|
|
if (IS_ERR(neigh)) {
|
|
dst_free(&rt->u.dst);
|
|
|
|
/* We are casting this because that is the return
|
|
* value type. But an errno encoded pointer is the
|
|
* same regardless of the underlying pointer type,
|
|
* and that's what we are returning. So this is OK.
|
|
*/
|
|
return (struct rt6_info *) neigh;
|
|
}
|
|
rt->rt6i_nexthop = neigh;
|
|
|
|
ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
|
|
rt->rt6i_dst.plen = 128;
|
|
rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
|
|
|
|
atomic_set(&rt->u.dst.__refcnt, 1);
|
|
|
|
return rt;
|
|
}
|
|
|
|
struct arg_dev_net {
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
};
|
|
|
|
static int fib6_ifdown(struct rt6_info *rt, void *arg)
|
|
{
|
|
struct net_device *dev = ((struct arg_dev_net *)arg)->dev;
|
|
struct net *net = ((struct arg_dev_net *)arg)->net;
|
|
|
|
if (((void *)rt->rt6i_dev == dev || dev == NULL) &&
|
|
rt != net->ipv6.ip6_null_entry) {
|
|
RT6_TRACE("deleted by ifdown %p\n", rt);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void rt6_ifdown(struct net *net, struct net_device *dev)
|
|
{
|
|
struct arg_dev_net adn = {
|
|
.dev = dev,
|
|
.net = net,
|
|
};
|
|
|
|
fib6_clean_all(net, fib6_ifdown, 0, &adn);
|
|
icmp6_clean_all(fib6_ifdown, &adn);
|
|
}
|
|
|
|
struct rt6_mtu_change_arg
|
|
{
|
|
struct net_device *dev;
|
|
unsigned mtu;
|
|
};
|
|
|
|
static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
|
|
{
|
|
struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
|
|
struct inet6_dev *idev;
|
|
struct net *net = dev_net(arg->dev);
|
|
|
|
/* In IPv6 pmtu discovery is not optional,
|
|
so that RTAX_MTU lock cannot disable it.
|
|
We still use this lock to block changes
|
|
caused by addrconf/ndisc.
|
|
*/
|
|
|
|
idev = __in6_dev_get(arg->dev);
|
|
if (idev == NULL)
|
|
return 0;
|
|
|
|
/* For administrative MTU increase, there is no way to discover
|
|
IPv6 PMTU increase, so PMTU increase should be updated here.
|
|
Since RFC 1981 doesn't include administrative MTU increase
|
|
update PMTU increase is a MUST. (i.e. jumbo frame)
|
|
*/
|
|
/*
|
|
If new MTU is less than route PMTU, this new MTU will be the
|
|
lowest MTU in the path, update the route PMTU to reflect PMTU
|
|
decreases; if new MTU is greater than route PMTU, and the
|
|
old MTU is the lowest MTU in the path, update the route PMTU
|
|
to reflect the increase. In this case if the other nodes' MTU
|
|
also have the lowest MTU, TOO BIG MESSAGE will be lead to
|
|
PMTU discouvery.
|
|
*/
|
|
if (rt->rt6i_dev == arg->dev &&
|
|
!dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
|
|
(dst_mtu(&rt->u.dst) >= arg->mtu ||
|
|
(dst_mtu(&rt->u.dst) < arg->mtu &&
|
|
dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
|
|
rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void rt6_mtu_change(struct net_device *dev, unsigned mtu)
|
|
{
|
|
struct rt6_mtu_change_arg arg = {
|
|
.dev = dev,
|
|
.mtu = mtu,
|
|
};
|
|
|
|
fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
|
|
}
|
|
|
|
static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
|
|
[RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
|
|
[RTA_OIF] = { .type = NLA_U32 },
|
|
[RTA_IIF] = { .type = NLA_U32 },
|
|
[RTA_PRIORITY] = { .type = NLA_U32 },
|
|
[RTA_METRICS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct fib6_config *cfg)
|
|
{
|
|
struct rtmsg *rtm;
|
|
struct nlattr *tb[RTA_MAX+1];
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = -EINVAL;
|
|
rtm = nlmsg_data(nlh);
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
|
|
cfg->fc_table = rtm->rtm_table;
|
|
cfg->fc_dst_len = rtm->rtm_dst_len;
|
|
cfg->fc_src_len = rtm->rtm_src_len;
|
|
cfg->fc_flags = RTF_UP;
|
|
cfg->fc_protocol = rtm->rtm_protocol;
|
|
|
|
if (rtm->rtm_type == RTN_UNREACHABLE)
|
|
cfg->fc_flags |= RTF_REJECT;
|
|
|
|
cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
|
|
cfg->fc_nlinfo.nlh = nlh;
|
|
cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
|
|
|
|
if (tb[RTA_GATEWAY]) {
|
|
nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
|
|
cfg->fc_flags |= RTF_GATEWAY;
|
|
}
|
|
|
|
if (tb[RTA_DST]) {
|
|
int plen = (rtm->rtm_dst_len + 7) >> 3;
|
|
|
|
if (nla_len(tb[RTA_DST]) < plen)
|
|
goto errout;
|
|
|
|
nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
|
|
}
|
|
|
|
if (tb[RTA_SRC]) {
|
|
int plen = (rtm->rtm_src_len + 7) >> 3;
|
|
|
|
if (nla_len(tb[RTA_SRC]) < plen)
|
|
goto errout;
|
|
|
|
nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
|
|
}
|
|
|
|
if (tb[RTA_OIF])
|
|
cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
|
|
|
|
if (tb[RTA_PRIORITY])
|
|
cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
|
|
|
|
if (tb[RTA_METRICS]) {
|
|
cfg->fc_mx = nla_data(tb[RTA_METRICS]);
|
|
cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
|
|
}
|
|
|
|
if (tb[RTA_TABLE])
|
|
cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
|
|
|
|
err = 0;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct fib6_config cfg;
|
|
int err;
|
|
|
|
err = rtm_to_fib6_config(skb, nlh, &cfg);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return ip6_route_del(&cfg);
|
|
}
|
|
|
|
static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct fib6_config cfg;
|
|
int err;
|
|
|
|
err = rtm_to_fib6_config(skb, nlh, &cfg);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return ip6_route_add(&cfg);
|
|
}
|
|
|
|
static inline size_t rt6_nlmsg_size(void)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct rtmsg))
|
|
+ nla_total_size(16) /* RTA_SRC */
|
|
+ nla_total_size(16) /* RTA_DST */
|
|
+ nla_total_size(16) /* RTA_GATEWAY */
|
|
+ nla_total_size(16) /* RTA_PREFSRC */
|
|
+ nla_total_size(4) /* RTA_TABLE */
|
|
+ nla_total_size(4) /* RTA_IIF */
|
|
+ nla_total_size(4) /* RTA_OIF */
|
|
+ nla_total_size(4) /* RTA_PRIORITY */
|
|
+ RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
|
|
+ nla_total_size(sizeof(struct rta_cacheinfo));
|
|
}
|
|
|
|
static int rt6_fill_node(struct net *net,
|
|
struct sk_buff *skb, struct rt6_info *rt,
|
|
struct in6_addr *dst, struct in6_addr *src,
|
|
int iif, int type, u32 pid, u32 seq,
|
|
int prefix, int nowait, unsigned int flags)
|
|
{
|
|
struct rtmsg *rtm;
|
|
struct nlmsghdr *nlh;
|
|
long expires;
|
|
u32 table;
|
|
|
|
if (prefix) { /* user wants prefix routes only */
|
|
if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
|
|
/* success since this is not a prefix route */
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
rtm->rtm_family = AF_INET6;
|
|
rtm->rtm_dst_len = rt->rt6i_dst.plen;
|
|
rtm->rtm_src_len = rt->rt6i_src.plen;
|
|
rtm->rtm_tos = 0;
|
|
if (rt->rt6i_table)
|
|
table = rt->rt6i_table->tb6_id;
|
|
else
|
|
table = RT6_TABLE_UNSPEC;
|
|
rtm->rtm_table = table;
|
|
NLA_PUT_U32(skb, RTA_TABLE, table);
|
|
if (rt->rt6i_flags&RTF_REJECT)
|
|
rtm->rtm_type = RTN_UNREACHABLE;
|
|
else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
|
|
rtm->rtm_type = RTN_LOCAL;
|
|
else
|
|
rtm->rtm_type = RTN_UNICAST;
|
|
rtm->rtm_flags = 0;
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
rtm->rtm_protocol = rt->rt6i_protocol;
|
|
if (rt->rt6i_flags&RTF_DYNAMIC)
|
|
rtm->rtm_protocol = RTPROT_REDIRECT;
|
|
else if (rt->rt6i_flags & RTF_ADDRCONF)
|
|
rtm->rtm_protocol = RTPROT_KERNEL;
|
|
else if (rt->rt6i_flags&RTF_DEFAULT)
|
|
rtm->rtm_protocol = RTPROT_RA;
|
|
|
|
if (rt->rt6i_flags&RTF_CACHE)
|
|
rtm->rtm_flags |= RTM_F_CLONED;
|
|
|
|
if (dst) {
|
|
NLA_PUT(skb, RTA_DST, 16, dst);
|
|
rtm->rtm_dst_len = 128;
|
|
} else if (rtm->rtm_dst_len)
|
|
NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (src) {
|
|
NLA_PUT(skb, RTA_SRC, 16, src);
|
|
rtm->rtm_src_len = 128;
|
|
} else if (rtm->rtm_src_len)
|
|
NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
|
|
#endif
|
|
if (iif) {
|
|
#ifdef CONFIG_IPV6_MROUTE
|
|
if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
|
|
int err = ip6mr_get_route(net, skb, rtm, nowait);
|
|
if (err <= 0) {
|
|
if (!nowait) {
|
|
if (err == 0)
|
|
return 0;
|
|
goto nla_put_failure;
|
|
} else {
|
|
if (err == -EMSGSIZE)
|
|
goto nla_put_failure;
|
|
}
|
|
}
|
|
} else
|
|
#endif
|
|
NLA_PUT_U32(skb, RTA_IIF, iif);
|
|
} else if (dst) {
|
|
struct inet6_dev *idev = ip6_dst_idev(&rt->u.dst);
|
|
struct in6_addr saddr_buf;
|
|
if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
|
|
dst, 0, &saddr_buf) == 0)
|
|
NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
|
|
}
|
|
|
|
if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (rt->u.dst.neighbour)
|
|
NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
|
|
|
|
if (rt->u.dst.dev)
|
|
NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);
|
|
|
|
NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
|
|
|
|
if (!(rt->rt6i_flags & RTF_EXPIRES))
|
|
expires = 0;
|
|
else if (rt->rt6i_expires - jiffies < INT_MAX)
|
|
expires = rt->rt6i_expires - jiffies;
|
|
else
|
|
expires = INT_MAX;
|
|
|
|
if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
|
|
expires, rt->u.dst.error) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
|
|
{
|
|
struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
|
|
int prefix;
|
|
|
|
if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
|
|
struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
|
|
prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
|
|
} else
|
|
prefix = 0;
|
|
|
|
return rt6_fill_node(arg->net,
|
|
arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
|
|
NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
|
|
prefix, 0, NLM_F_MULTI);
|
|
}
|
|
|
|
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(in_skb->sk);
|
|
struct nlattr *tb[RTA_MAX+1];
|
|
struct rt6_info *rt;
|
|
struct sk_buff *skb;
|
|
struct rtmsg *rtm;
|
|
struct flowi fl;
|
|
int err, iif = 0;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = -EINVAL;
|
|
memset(&fl, 0, sizeof(fl));
|
|
|
|
if (tb[RTA_SRC]) {
|
|
if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
|
|
goto errout;
|
|
|
|
ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC]));
|
|
}
|
|
|
|
if (tb[RTA_DST]) {
|
|
if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
|
|
goto errout;
|
|
|
|
ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST]));
|
|
}
|
|
|
|
if (tb[RTA_IIF])
|
|
iif = nla_get_u32(tb[RTA_IIF]);
|
|
|
|
if (tb[RTA_OIF])
|
|
fl.oif = nla_get_u32(tb[RTA_OIF]);
|
|
|
|
if (iif) {
|
|
struct net_device *dev;
|
|
dev = __dev_get_by_index(net, iif);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL) {
|
|
err = -ENOBUFS;
|
|
goto errout;
|
|
}
|
|
|
|
/* Reserve room for dummy headers, this skb can pass
|
|
through good chunk of routing engine.
|
|
*/
|
|
skb_reset_mac_header(skb);
|
|
skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
|
|
|
|
rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl);
|
|
skb_dst_set(skb, &rt->u.dst);
|
|
|
|
err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
|
|
RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
|
|
nlh->nlmsg_seq, 0, 0, 0);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
|
|
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct net *net = info->nl_net;
|
|
u32 seq;
|
|
int err;
|
|
|
|
err = -ENOBUFS;
|
|
seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0;
|
|
|
|
skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
|
|
event, info->pid, seq, 0, 0, 0);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
|
|
info->nlh, gfp_any());
|
|
return;
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
|
|
}
|
|
|
|
static int ip6_route_dev_notify(struct notifier_block *this,
|
|
unsigned long event, void *data)
|
|
{
|
|
struct net_device *dev = (struct net_device *)data;
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
|
|
net->ipv6.ip6_null_entry->u.dst.dev = dev;
|
|
net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
net->ipv6.ip6_prohibit_entry->u.dst.dev = dev;
|
|
net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
|
|
net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev;
|
|
net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
|
|
#endif
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/*
|
|
* /proc
|
|
*/
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
#define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
|
|
|
|
struct rt6_proc_arg
|
|
{
|
|
char *buffer;
|
|
int offset;
|
|
int length;
|
|
int skip;
|
|
int len;
|
|
};
|
|
|
|
static int rt6_info_route(struct rt6_info *rt, void *p_arg)
|
|
{
|
|
struct seq_file *m = p_arg;
|
|
|
|
seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
|
|
#else
|
|
seq_puts(m, "00000000000000000000000000000000 00 ");
|
|
#endif
|
|
|
|
if (rt->rt6i_nexthop) {
|
|
seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key);
|
|
} else {
|
|
seq_puts(m, "00000000000000000000000000000000");
|
|
}
|
|
seq_printf(m, " %08x %08x %08x %08x %8s\n",
|
|
rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
|
|
rt->u.dst.__use, rt->rt6i_flags,
|
|
rt->rt6i_dev ? rt->rt6i_dev->name : "");
|
|
return 0;
|
|
}
|
|
|
|
static int ipv6_route_show(struct seq_file *m, void *v)
|
|
{
|
|
struct net *net = (struct net *)m->private;
|
|
fib6_clean_all(net, rt6_info_route, 0, m);
|
|
return 0;
|
|
}
|
|
|
|
static int ipv6_route_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open_net(inode, file, ipv6_route_show);
|
|
}
|
|
|
|
static const struct file_operations ipv6_route_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ipv6_route_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release_net,
|
|
};
|
|
|
|
static int rt6_stats_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct net *net = (struct net *)seq->private;
|
|
seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
|
|
net->ipv6.rt6_stats->fib_nodes,
|
|
net->ipv6.rt6_stats->fib_route_nodes,
|
|
net->ipv6.rt6_stats->fib_rt_alloc,
|
|
net->ipv6.rt6_stats->fib_rt_entries,
|
|
net->ipv6.rt6_stats->fib_rt_cache,
|
|
atomic_read(&net->ipv6.ip6_dst_ops->entries),
|
|
net->ipv6.rt6_stats->fib_discarded_routes);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rt6_stats_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open_net(inode, file, rt6_stats_seq_show);
|
|
}
|
|
|
|
static const struct file_operations rt6_stats_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rt6_stats_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release_net,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
static
|
|
int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct net *net = current->nsproxy->net_ns;
|
|
int delay = net->ipv6.sysctl.flush_delay;
|
|
if (write) {
|
|
proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
|
|
fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
|
|
return 0;
|
|
} else
|
|
return -EINVAL;
|
|
}
|
|
|
|
ctl_table ipv6_route_table_template[] = {
|
|
{
|
|
.procname = "flush",
|
|
.data = &init_net.ipv6.sysctl.flush_delay,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0200,
|
|
.proc_handler = ipv6_sysctl_rtcache_flush
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_THRESH,
|
|
.procname = "gc_thresh",
|
|
.data = &ip6_dst_ops_template.gc_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
|
|
.procname = "max_size",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_max_size,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
|
|
.procname = "gc_min_interval",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
.strategy = sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
|
|
.procname = "gc_timeout",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
.strategy = sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
|
|
.procname = "gc_interval",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
.strategy = sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
|
|
.procname = "gc_elasticity",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
.strategy = sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
|
|
.procname = "mtu_expires",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
.strategy = sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
|
|
.procname = "min_adv_mss",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
.strategy = sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
|
|
.procname = "gc_min_interval_ms",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_ms_jiffies,
|
|
.strategy = sysctl_ms_jiffies,
|
|
},
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
struct ctl_table *ipv6_route_sysctl_init(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = kmemdup(ipv6_route_table_template,
|
|
sizeof(ipv6_route_table_template),
|
|
GFP_KERNEL);
|
|
|
|
if (table) {
|
|
table[0].data = &net->ipv6.sysctl.flush_delay;
|
|
table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh;
|
|
table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
|
|
table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
|
|
table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
|
|
table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
|
|
table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
|
|
table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
|
|
}
|
|
|
|
return table;
|
|
}
|
|
#endif
|
|
|
|
static int ip6_route_net_init(struct net *net)
|
|
{
|
|
int ret = -ENOMEM;
|
|
|
|
net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template,
|
|
sizeof(*net->ipv6.ip6_dst_ops),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_dst_ops)
|
|
goto out;
|
|
net->ipv6.ip6_dst_ops->dst_net = hold_net(net);
|
|
|
|
net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
|
|
sizeof(*net->ipv6.ip6_null_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_null_entry)
|
|
goto out_ip6_dst_ops;
|
|
net->ipv6.ip6_null_entry->u.dst.path =
|
|
(struct dst_entry *)net->ipv6.ip6_null_entry;
|
|
net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
|
|
sizeof(*net->ipv6.ip6_prohibit_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_prohibit_entry)
|
|
goto out_ip6_null_entry;
|
|
net->ipv6.ip6_prohibit_entry->u.dst.path =
|
|
(struct dst_entry *)net->ipv6.ip6_prohibit_entry;
|
|
net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
|
|
|
|
net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
|
|
sizeof(*net->ipv6.ip6_blk_hole_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_blk_hole_entry)
|
|
goto out_ip6_prohibit_entry;
|
|
net->ipv6.ip6_blk_hole_entry->u.dst.path =
|
|
(struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
|
|
net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
|
|
#endif
|
|
|
|
net->ipv6.sysctl.flush_delay = 0;
|
|
net->ipv6.sysctl.ip6_rt_max_size = 4096;
|
|
net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
|
|
net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
|
|
net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
|
|
net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
|
|
net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
|
|
net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
|
|
proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
|
|
#endif
|
|
net->ipv6.ip6_rt_gc_expire = 30*HZ;
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
out_ip6_prohibit_entry:
|
|
kfree(net->ipv6.ip6_prohibit_entry);
|
|
out_ip6_null_entry:
|
|
kfree(net->ipv6.ip6_null_entry);
|
|
#endif
|
|
out_ip6_dst_ops:
|
|
release_net(net->ipv6.ip6_dst_ops->dst_net);
|
|
kfree(net->ipv6.ip6_dst_ops);
|
|
goto out;
|
|
}
|
|
|
|
static void ip6_route_net_exit(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_net_remove(net, "ipv6_route");
|
|
proc_net_remove(net, "rt6_stats");
|
|
#endif
|
|
kfree(net->ipv6.ip6_null_entry);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
kfree(net->ipv6.ip6_prohibit_entry);
|
|
kfree(net->ipv6.ip6_blk_hole_entry);
|
|
#endif
|
|
release_net(net->ipv6.ip6_dst_ops->dst_net);
|
|
kfree(net->ipv6.ip6_dst_ops);
|
|
}
|
|
|
|
static struct pernet_operations ip6_route_net_ops = {
|
|
.init = ip6_route_net_init,
|
|
.exit = ip6_route_net_exit,
|
|
};
|
|
|
|
static struct notifier_block ip6_route_dev_notifier = {
|
|
.notifier_call = ip6_route_dev_notify,
|
|
.priority = 0,
|
|
};
|
|
|
|
int __init ip6_route_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = -ENOMEM;
|
|
ip6_dst_ops_template.kmem_cachep =
|
|
kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!ip6_dst_ops_template.kmem_cachep)
|
|
goto out;
|
|
|
|
ret = register_pernet_subsys(&ip6_route_net_ops);
|
|
if (ret)
|
|
goto out_kmem_cache;
|
|
|
|
ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
|
|
|
|
/* Registering of the loopback is done before this portion of code,
|
|
* the loopback reference in rt6_info will not be taken, do it
|
|
* manually for init_net */
|
|
init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
#endif
|
|
ret = fib6_init();
|
|
if (ret)
|
|
goto out_register_subsys;
|
|
|
|
ret = xfrm6_init();
|
|
if (ret)
|
|
goto out_fib6_init;
|
|
|
|
ret = fib6_rules_init();
|
|
if (ret)
|
|
goto xfrm6_init;
|
|
|
|
ret = -ENOBUFS;
|
|
if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) ||
|
|
__rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) ||
|
|
__rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL))
|
|
goto fib6_rules_init;
|
|
|
|
ret = register_netdevice_notifier(&ip6_route_dev_notifier);
|
|
if (ret)
|
|
goto fib6_rules_init;
|
|
|
|
out:
|
|
return ret;
|
|
|
|
fib6_rules_init:
|
|
fib6_rules_cleanup();
|
|
xfrm6_init:
|
|
xfrm6_fini();
|
|
out_fib6_init:
|
|
fib6_gc_cleanup();
|
|
out_register_subsys:
|
|
unregister_pernet_subsys(&ip6_route_net_ops);
|
|
out_kmem_cache:
|
|
kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
|
|
goto out;
|
|
}
|
|
|
|
void ip6_route_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(&ip6_route_dev_notifier);
|
|
fib6_rules_cleanup();
|
|
xfrm6_fini();
|
|
fib6_gc_cleanup();
|
|
unregister_pernet_subsys(&ip6_route_net_ops);
|
|
kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
|
|
}
|