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Message-ID: <5578630F.9070602@redhat.com>
Date: Wed, 10 Jun 2015 09:17:19 -0700
From: Alexander Duyck <alexander.h.duyck@...hat.com>
To: Andy Gospodarek <gospo@...ulusnetworks.com>,
netdev@...r.kernel.org, davem@...emloft.net,
ddutt@...ulusnetworks.com, sfeldma@...il.com,
alexander.duyck@...il.com, hannes@...essinduktion.org,
stephen@...workplumber.org
Subject: Re: [PATCH net-next 2/3 v2] net: ipv4 sysctl option to ignore routes
when nexthop link is down
On 06/09/2015 11:47 PM, Andy Gospodarek wrote:
> This feature is only enabled with the new per-interface or ipv4 global
> sysctls called 'ignore_routes_with_linkdown'.
>
> net.ipv4.conf.all.ignore_routes_with_linkdown = 0
> net.ipv4.conf.default.ignore_routes_with_linkdown = 0
> net.ipv4.conf.lo.ignore_routes_with_linkdown = 0
> ...
>
> When the above sysctls are set, will report to userspace that a route is
> dead and will no longer resolve to this nexthop when performing a fib
> lookup. This will signal to userspace that the route will not be
> selected. The signalling of a RTNH_F_DEAD is only passed to userspace
> if the sysctl is enabled and link is down. This was done as without it the
> netlink listeners would have no idea whether or not a nexthop would be
> selected. The kernel only sets RTNH_F_DEAD internally if the inteface has
> IFF_UP cleared.
>
> With the new sysctl set, the following behavior can be observed
> (interface p8p1 is link-down):
>
> # ip route show
> default via 10.0.5.2 dev p9p1
> 10.0.5.0/24 dev p9p1 proto kernel scope link src 10.0.5.15
> 70.0.0.0/24 dev p7p1 proto kernel scope link src 70.0.0.1
> 80.0.0.0/24 dev p8p1 proto kernel scope link src 80.0.0.1 dead linkdown
> 90.0.0.0/24 via 80.0.0.2 dev p8p1 metric 1 dead linkdown
> 90.0.0.0/24 via 70.0.0.2 dev p7p1 metric 2
> # ip route get 90.0.0.1
> 90.0.0.1 via 70.0.0.2 dev p7p1 src 70.0.0.1
> cache
> # ip route get 80.0.0.1
> local 80.0.0.1 dev lo src 80.0.0.1
> cache <local>
> # ip route get 80.0.0.2
> 80.0.0.2 via 10.0.5.2 dev p9p1 src 10.0.5.15
> cache
>
> While the route does remain in the table (so it can be modified if
> needed rather than being wiped away as it would be if IFF_UP was
> cleared), the proper next-hop is chosen automatically when the link is
> down. Now interface p8p1 is linked-up:
>
> # ip route show
> default via 10.0.5.2 dev p9p1
> 10.0.5.0/24 dev p9p1 proto kernel scope link src 10.0.5.15
> 70.0.0.0/24 dev p7p1 proto kernel scope link src 70.0.0.1
> 80.0.0.0/24 dev p8p1 proto kernel scope link src 80.0.0.1
> 90.0.0.0/24 via 80.0.0.2 dev p8p1 metric 1
> 90.0.0.0/24 via 70.0.0.2 dev p7p1 metric 2
> 192.168.56.0/24 dev p2p1 proto kernel scope link src 192.168.56.2
> # ip route get 90.0.0.1
> 90.0.0.1 via 80.0.0.2 dev p8p1 src 80.0.0.1
> cache
> # ip route get 80.0.0.1
> local 80.0.0.1 dev lo src 80.0.0.1
> cache <local>
> # ip route get 80.0.0.2
> 80.0.0.2 dev p8p1 src 80.0.0.1
> cache
>
> and the output changes to what one would expect.
>
> If the sysctl is not set, the following output would be expected when
> p8p1 is down:
>
> # ip route show
> default via 10.0.5.2 dev p9p1
> 10.0.5.0/24 dev p9p1 proto kernel scope link src 10.0.5.15
> 70.0.0.0/24 dev p7p1 proto kernel scope link src 70.0.0.1
> 80.0.0.0/24 dev p8p1 proto kernel scope link src 80.0.0.1 linkdown
> 90.0.0.0/24 via 80.0.0.2 dev p8p1 metric 1 linkdown
> 90.0.0.0/24 via 70.0.0.2 dev p7p1 metric 2
>
> Since the dead flag does not appear, there should be no expectation that
> the kernel would skip using this route due to link being down.
>
> v2: Split kernel changes into 2 patches, this actually makes a
> behavioral change if the sysctl is set. Also took suggestion from Alex
> to simplify code by only checking sysctl during fib lookup and
> suggestion from Scott to add a per-interface sysctl.
>
> Signed-off-by: Andy Gospodarek <gospo@...ulusnetworks.com>
> Signed-off-by: Dinesh Dutt <ddutt@...ulusnetworks.com>
> ---
> include/linux/inetdevice.h | 3 +++
> include/net/fib_rules.h | 3 ++-
> include/net/ip_fib.h | 17 ++++++++++-------
> include/uapi/linux/ip.h | 1 +
> include/uapi/linux/sysctl.h | 1 +
> kernel/sysctl_binary.c | 1 +
> net/ipv4/devinet.c | 2 ++
> net/ipv4/fib_frontend.c | 6 +++---
> net/ipv4/fib_rules.c | 5 +++--
> net/ipv4/fib_semantics.c | 28 ++++++++++++++++++++++------
> net/ipv4/fib_trie.c | 7 +++++++
> net/ipv4/netfilter/ipt_rpfilter.c | 2 +-
> net/ipv4/route.c | 10 +++++-----
> 13 files changed, 61 insertions(+), 25 deletions(-)
>
> diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
> index 0a21fbe..a4328ce 100644
> --- a/include/linux/inetdevice.h
> +++ b/include/linux/inetdevice.h
> @@ -120,6 +120,9 @@ static inline void ipv4_devconf_setall(struct in_device *in_dev)
> || (!IN_DEV_FORWARD(in_dev) && \
> IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
>
> +#define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
> + IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
> +
> #define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
> #define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
> #define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
> diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
> index 6d67383..903a55e 100644
> --- a/include/net/fib_rules.h
> +++ b/include/net/fib_rules.h
> @@ -36,7 +36,8 @@ struct fib_lookup_arg {
> void *result;
> struct fib_rule *rule;
> int flags;
> -#define FIB_LOOKUP_NOREF 1
> +#define FIB_LOOKUP_NOREF 1
> +#define FIB_LOOKUP_IGNORE_LINKSTATE 2
> };
>
> struct fib_rules_ops {
> diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
> index d1de1b7..854d790 100644
> --- a/include/net/ip_fib.h
> +++ b/include/net/ip_fib.h
> @@ -226,7 +226,7 @@ static inline struct fib_table *fib_new_table(struct net *net, u32 id)
> }
>
> static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
> - struct fib_result *res)
> + struct fib_result *res, unsigned int flags)
> {
> struct fib_table *tb;
> int err = -ENETUNREACH;
> @@ -234,7 +234,7 @@ static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
> rcu_read_lock();
>
> tb = fib_get_table(net, RT_TABLE_MAIN);
> - if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
> + if (tb && !fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF))
> err = 0;
>
> rcu_read_unlock();
> @@ -249,16 +249,17 @@ void __net_exit fib4_rules_exit(struct net *net);
> struct fib_table *fib_new_table(struct net *net, u32 id);
> struct fib_table *fib_get_table(struct net *net, u32 id);
>
> -int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res);
> +int __fib_lookup(struct net *net, struct flowi4 *flp,
> + struct fib_result *res, unsigned int flags);
>
> static inline int fib_lookup(struct net *net, struct flowi4 *flp,
> - struct fib_result *res)
> + struct fib_result *res, unsigned int flags)
> {
> struct fib_table *tb;
> int err;
>
> if (net->ipv4.fib_has_custom_rules)
> - return __fib_lookup(net, flp, res);
> + return __fib_lookup(net, flp, res, flags | FIB_LOOKUP_NOREF);
>
> rcu_read_lock();
>
> @@ -266,11 +267,13 @@ static inline int fib_lookup(struct net *net, struct flowi4 *flp,
>
> for (err = 0; !err; err = -ENETUNREACH) {
> tb = rcu_dereference_rtnl(net->ipv4.fib_main);
> - if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
> + if (tb && !fib_table_lookup(tb, flp, res,
> + flags | FIB_LOOKUP_NOREF))
> break;
>
> tb = rcu_dereference_rtnl(net->ipv4.fib_default);
> - if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
> + if (tb && !fib_table_lookup(tb, flp, res,
> + flags | FIB_LOOKUP_NOREF))
> break;
> }
>
Instead of 3 lines w/ flags | FIB_LOOKUP_NOREF you could probably just
do a flags |= FIB_LOOKUP_NOREF once and save yourself some trouble.
> diff --git a/include/uapi/linux/ip.h b/include/uapi/linux/ip.h
> index 4119594..08f894d 100644
> --- a/include/uapi/linux/ip.h
> +++ b/include/uapi/linux/ip.h
> @@ -164,6 +164,7 @@ enum
> IPV4_DEVCONF_ROUTE_LOCALNET,
> IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
> IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
> + IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
> __IPV4_DEVCONF_MAX
> };
>
> diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
> index 0956373..62fda94 100644
> --- a/include/uapi/linux/sysctl.h
> +++ b/include/uapi/linux/sysctl.h
> @@ -482,6 +482,7 @@ enum
> NET_IPV4_CONF_PROMOTE_SECONDARIES=20,
> NET_IPV4_CONF_ARP_ACCEPT=21,
> NET_IPV4_CONF_ARP_NOTIFY=22,
> + NET_IPV4_CONF_IGNORE_ROUTES_WITH_LINKDOWN=23,
> };
>
> /* /proc/sys/net/ipv4/netfilter */
> diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
> index 7e7746a..c9d0a0e 100644
> --- a/kernel/sysctl_binary.c
> +++ b/kernel/sysctl_binary.c
> @@ -253,6 +253,7 @@ static const struct bin_table bin_net_ipv4_conf_vars_table[] = {
> { CTL_INT, NET_IPV4_CONF_NOPOLICY, "disable_policy" },
> { CTL_INT, NET_IPV4_CONF_FORCE_IGMP_VERSION, "force_igmp_version" },
> { CTL_INT, NET_IPV4_CONF_PROMOTE_SECONDARIES, "promote_secondaries" },
> + { CTL_INT, NET_IPV4_CONF_IGNORE_ROUTES_WITH_LINKDOWN, "ignore_routes_with_linkdown" },
> {}
> };
>
> diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
> index 419d23c..7498716 100644
> --- a/net/ipv4/devinet.c
> +++ b/net/ipv4/devinet.c
> @@ -2169,6 +2169,8 @@ static struct devinet_sysctl_table {
> "igmpv2_unsolicited_report_interval"),
> DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
> "igmpv3_unsolicited_report_interval"),
> + DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
> + "ignore_routes_with_linkdown"),
>
> DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
> DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
> diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
> index 1e4c646..ead31c6 100644
> --- a/net/ipv4/fib_frontend.c
> +++ b/net/ipv4/fib_frontend.c
> @@ -280,7 +280,7 @@ __be32 fib_compute_spec_dst(struct sk_buff *skb)
> fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
> fl4.flowi4_scope = scope;
> fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0;
> - if (!fib_lookup(net, &fl4, &res))
> + if (!fib_lookup(net, &fl4, &res, 0))
> return FIB_RES_PREFSRC(net, res);
> } else {
> scope = RT_SCOPE_LINK;
> @@ -319,7 +319,7 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
> fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
>
> net = dev_net(dev);
> - if (fib_lookup(net, &fl4, &res))
> + if (fib_lookup(net, &fl4, &res, 0))
> goto last_resort;
> if (res.type != RTN_UNICAST &&
> (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev)))
> @@ -354,7 +354,7 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
> fl4.flowi4_oif = dev->ifindex;
>
> ret = 0;
> - if (fib_lookup(net, &fl4, &res) == 0) {
> + if (fib_lookup(net, &fl4, &res, 0) == 0) {
> if (res.type == RTN_UNICAST)
> ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
> }
The code for validating a source could probably ignore the LINKDOWN
message. Otherwise we run the risk of a link flapping and confusing the
source since the link is down but any Rx packets in the rings are being
flushed.
> diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
> index 5615198..18123d5 100644
> --- a/net/ipv4/fib_rules.c
> +++ b/net/ipv4/fib_rules.c
> @@ -47,11 +47,12 @@ struct fib4_rule {
> #endif
> };
>
> -int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
> +int __fib_lookup(struct net *net, struct flowi4 *flp,
> + struct fib_result *res, unsigned int flags)
> {
> struct fib_lookup_arg arg = {
> .result = res,
> - .flags = FIB_LOOKUP_NOREF,
> + .flags = flags,
> };
> int err;
>
> diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
> index 776e029..4dd709f 100644
> --- a/net/ipv4/fib_semantics.c
> +++ b/net/ipv4/fib_semantics.c
> @@ -623,7 +623,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
> /* It is not necessary, but requires a bit of thinking */
> if (fl4.flowi4_scope < RT_SCOPE_LINK)
> fl4.flowi4_scope = RT_SCOPE_LINK;
> - err = fib_lookup(net, &fl4, &res);
> + err = fib_lookup(net, &fl4, &res,
> + FIB_LOOKUP_IGNORE_LINKSTATE);
> if (err) {
> rcu_read_unlock();
> return err;
> @@ -1035,12 +1036,16 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
> nla_put_in_addr(skb, RTA_PREFSRC, fi->fib_prefsrc))
> goto nla_put_failure;
> if (fi->fib_nhs == 1) {
> + struct in_device *in_dev = __in_dev_get_rcu(fi->fib_nh->nh_dev);
> if (fi->fib_nh->nh_gw &&
> nla_put_in_addr(skb, RTA_GATEWAY, fi->fib_nh->nh_gw))
> goto nla_put_failure;
> if (fi->fib_nh->nh_oif &&
> nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif))
> goto nla_put_failure;
> + if (in_dev && IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) &&
> + fi->fib_nh->nh_flags & RTNH_F_LINKDOWN)
> + rtm->rtm_flags |= RTNH_F_DEAD;
> #ifdef CONFIG_IP_ROUTE_CLASSID
> if (fi->fib_nh[0].nh_tclassid &&
> nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid))
> @@ -1057,11 +1062,16 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
> goto nla_put_failure;
>
> for_nexthops(fi) {
> + struct in_device *in_dev = __in_dev_get_rcu(nh->nh_dev);
> rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
> if (!rtnh)
> goto nla_put_failure;
>
> - rtnh->rtnh_flags = nh->nh_flags & 0xFF;
> + if (in_dev && IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) &&
> + nh->nh_flags & RTNH_F_LINKDOWN)
> + rtnh->rtnh_flags = (nh->nh_flags | RTNH_F_DEAD) & 0xFF;
> + else
> + rtnh->rtnh_flags = nh->nh_flags & 0xFF;
> rtnh->rtnh_hops = nh->nh_weight - 1;
> rtnh->rtnh_ifindex = nh->nh_oif;
>
Why not just split this if into two seperate statments? One taking care
of the first setting of rtnh_flags and then a second one ORing in the
RTNH_F_DEAD.
> @@ -1306,16 +1316,22 @@ int fib_sync_up(struct net_device *dev, unsigned int nh_flags)
> void fib_select_multipath(struct fib_result *res)
> {
> struct fib_info *fi = res->fi;
> + struct in_device *in_dev;
> int w;
>
> spin_lock_bh(&fib_multipath_lock);
> if (fi->fib_power <= 0) {
> int power = 0;
> change_nexthops(fi) {
> - if (!(nexthop_nh->nh_flags & RTNH_F_DEAD)) {
> - power += nexthop_nh->nh_weight;
> - nexthop_nh->nh_power = nexthop_nh->nh_weight;
> - }
> + in_dev = __in_dev_get_rcu(nexthop_nh->nh_dev);
> + if (nexthop_nh->nh_flags & RTNH_F_DEAD)
> + continue;
> + if (in_dev &&
> + IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) &&
> + nexthop_nh->nh_flags & RTNH_F_LINKDOWN)
> + continue;
> + power += nexthop_nh->nh_weight;
> + nexthop_nh->nh_power = nexthop_nh->nh_weight;
> } endfor_nexthops(fi);
> fi->fib_power = power;
> if (power <= 0) {
> diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
> index 3c699c4..f75ca20 100644
> --- a/net/ipv4/fib_trie.c
> +++ b/net/ipv4/fib_trie.c
> @@ -1407,11 +1407,18 @@ found:
> }
> if (fi->fib_flags & RTNH_F_DEAD)
> continue;
> +
> for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
> const struct fib_nh *nh = &fi->fib_nh[nhsel];
> + struct in_device *in_dev = __in_dev_get_rcu(nh->nh_dev);
>
> if (nh->nh_flags & RTNH_F_DEAD)
> continue;
> + if (in_dev &&
> + IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) &&
> + nh->nh_flags & RTNH_F_LINKDOWN &&
> + !(fib_flags & FIB_LOOKUP_IGNORE_LINKSTATE))
> + continue;
> if (flp->flowi4_oif && flp->flowi4_oif != nh->nh_oif)
> continue;
>
The order of checks should be:
1. (nh->nh_flags & RTNH_F_LINKDOWN)
2. !(fib_flags & FIB_LOOKUP_IGNORE_LINKSTATE)
3. in_dev
4. IGNORE_ROUTES_WITH_LINKDOWN
That way we don't waste time checking the in_dev if the link isn't
reported as being down. Also I would probably move the whole block
inside an if statement based off of the first 2 checks since nothing
else is making use of in_dev.
> diff --git a/net/ipv4/netfilter/ipt_rpfilter.c b/net/ipv4/netfilter/ipt_rpfilter.c
> index 4bfaedf..250c633 100644
> --- a/net/ipv4/netfilter/ipt_rpfilter.c
> +++ b/net/ipv4/netfilter/ipt_rpfilter.c
> @@ -40,7 +40,7 @@ static bool rpfilter_lookup_reverse(struct flowi4 *fl4,
> struct net *net = dev_net(dev);
> int ret __maybe_unused;
>
> - if (fib_lookup(net, fl4, &res))
> + if (fib_lookup(net, fl4, &res, 0))
> return false;
>
> if (res.type != RTN_UNICAST) {
Any rpfilter stuff can probably ignore the linkdown check since it is
possible that a driver could be flushing data just after a link went down.
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index f605598..d0362a2 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -747,7 +747,7 @@ static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flow
> if (!(n->nud_state & NUD_VALID)) {
> neigh_event_send(n, NULL);
> } else {
> - if (fib_lookup(net, fl4, &res) == 0) {
> + if (fib_lookup(net, fl4, &res, 0) == 0) {
> struct fib_nh *nh = &FIB_RES_NH(res);
>
> update_or_create_fnhe(nh, fl4->daddr, new_gw,
> @@ -975,7 +975,7 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
> return;
>
> rcu_read_lock();
> - if (fib_lookup(dev_net(dst->dev), fl4, &res) == 0) {
> + if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) {
> struct fib_nh *nh = &FIB_RES_NH(res);
>
> update_or_create_fnhe(nh, fl4->daddr, 0, mtu,
> @@ -1186,7 +1186,7 @@ void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt)
> fl4.flowi4_mark = skb->mark;
>
> rcu_read_lock();
> - if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0)
> + if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0)
> src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res);
> else
> src = inet_select_addr(rt->dst.dev,
> @@ -1716,7 +1716,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
> fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
> fl4.daddr = daddr;
> fl4.saddr = saddr;
> - err = fib_lookup(net, &fl4, &res);
> + err = fib_lookup(net, &fl4, &res, 0);
> if (err != 0) {
> if (!IN_DEV_FORWARD(in_dev))
> err = -EHOSTUNREACH;
> @@ -2123,7 +2123,7 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4)
> goto make_route;
> }
>
> - if (fib_lookup(net, fl4, &res)) {
> + if (fib_lookup(net, fl4, &res, 0)) {
> res.fi = NULL;
> res.table = NULL;
> if (fl4->flowi4_oif) {
>
--
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