This is a note to let you know that I've just added the patch titled net: Consolidate common blackhole dst ops to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-consolidate-common-blackhole-dst-ops.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 5abe5a1c5ff9fd26cd06d4cd7499619a35c0bdeb Author: Daniel Borkmann <daniel@xxxxxxxxxxxxx> Date: Wed Mar 10 01:38:09 2021 +0100 net: Consolidate common blackhole dst ops [ Upstream commit c4c877b2732466b4c63217baad05c96f775912c7 ] Move generic blackhole dst ops to the core and use them from both ipv4_dst_blackhole_ops and ip6_dst_blackhole_ops where possible. No functional change otherwise. We need these also in other locations and having to define them over and over again is not great. Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/include/net/dst.h b/include/net/dst.h index 10f0a8399867..8d7cf51766c4 100644 --- a/include/net/dst.h +++ b/include/net/dst.h @@ -533,4 +533,15 @@ static inline void skb_dst_update_pmtu_no_confirm(struct sk_buff *skb, u32 mtu) dst->ops->update_pmtu(dst, NULL, skb, mtu, false); } +struct dst_entry *dst_blackhole_check(struct dst_entry *dst, u32 cookie); +void dst_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, + struct sk_buff *skb, u32 mtu, bool confirm_neigh); +void dst_blackhole_redirect(struct dst_entry *dst, struct sock *sk, + struct sk_buff *skb); +u32 *dst_blackhole_cow_metrics(struct dst_entry *dst, unsigned long old); +struct neighbour *dst_blackhole_neigh_lookup(const struct dst_entry *dst, + struct sk_buff *skb, + const void *daddr); +unsigned int dst_blackhole_mtu(const struct dst_entry *dst); + #endif /* _NET_DST_H */ diff --git a/net/core/dst.c b/net/core/dst.c index 0c01bd8d9d81..5f6315601776 100644 --- a/net/core/dst.c +++ b/net/core/dst.c @@ -237,6 +237,44 @@ void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old) } EXPORT_SYMBOL(__dst_destroy_metrics_generic); +struct dst_entry *dst_blackhole_check(struct dst_entry *dst, u32 cookie) +{ + return NULL; +} + +u32 *dst_blackhole_cow_metrics(struct dst_entry *dst, unsigned long old) +{ + return NULL; +} + +struct neighbour *dst_blackhole_neigh_lookup(const struct dst_entry *dst, + struct sk_buff *skb, + const void *daddr) +{ + return NULL; +} + +void dst_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, + struct sk_buff *skb, u32 mtu, + bool confirm_neigh) +{ +} +EXPORT_SYMBOL_GPL(dst_blackhole_update_pmtu); + +void dst_blackhole_redirect(struct dst_entry *dst, struct sock *sk, + struct sk_buff *skb) +{ +} +EXPORT_SYMBOL_GPL(dst_blackhole_redirect); + +unsigned int dst_blackhole_mtu(const struct dst_entry *dst) +{ + unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); + + return mtu ? : dst->dev->mtu; +} +EXPORT_SYMBOL_GPL(dst_blackhole_mtu); + static struct dst_ops md_dst_ops = { .family = AF_UNSPEC, }; diff --git a/net/ipv4/route.c b/net/ipv4/route.c index e26652ff7059..983b4db1868f 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2682,44 +2682,15 @@ out: return rth; } -static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) -{ - return NULL; -} - -static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) -{ - unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); - - return mtu ? : dst->dev->mtu; -} - -static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, - struct sk_buff *skb, u32 mtu, - bool confirm_neigh) -{ -} - -static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, - struct sk_buff *skb) -{ -} - -static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, - unsigned long old) -{ - return NULL; -} - static struct dst_ops ipv4_dst_blackhole_ops = { - .family = AF_INET, - .check = ipv4_blackhole_dst_check, - .mtu = ipv4_blackhole_mtu, - .default_advmss = ipv4_default_advmss, - .update_pmtu = ipv4_rt_blackhole_update_pmtu, - .redirect = ipv4_rt_blackhole_redirect, - .cow_metrics = ipv4_rt_blackhole_cow_metrics, - .neigh_lookup = ipv4_neigh_lookup, + .family = AF_INET, + .default_advmss = ipv4_default_advmss, + .neigh_lookup = ipv4_neigh_lookup, + .check = dst_blackhole_check, + .cow_metrics = dst_blackhole_cow_metrics, + .update_pmtu = dst_blackhole_update_pmtu, + .redirect = dst_blackhole_redirect, + .mtu = dst_blackhole_mtu, }; struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 188e114b29b4..0bbfaa55e3c8 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -258,34 +258,16 @@ static struct dst_ops ip6_dst_ops_template = { .confirm_neigh = ip6_confirm_neigh, }; -static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) -{ - unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); - - return mtu ? : dst->dev->mtu; -} - -static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, - struct sk_buff *skb, u32 mtu, - bool confirm_neigh) -{ -} - -static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, - struct sk_buff *skb) -{ -} - static struct dst_ops ip6_dst_blackhole_ops = { - .family = AF_INET6, - .destroy = ip6_dst_destroy, - .check = ip6_dst_check, - .mtu = ip6_blackhole_mtu, - .default_advmss = ip6_default_advmss, - .update_pmtu = ip6_rt_blackhole_update_pmtu, - .redirect = ip6_rt_blackhole_redirect, - .cow_metrics = dst_cow_metrics_generic, - .neigh_lookup = ip6_dst_neigh_lookup, + .family = AF_INET6, + .default_advmss = ip6_default_advmss, + .neigh_lookup = ip6_dst_neigh_lookup, + .check = ip6_dst_check, + .destroy = ip6_dst_destroy, + .cow_metrics = dst_cow_metrics_generic, + .update_pmtu = dst_blackhole_update_pmtu, + .redirect = dst_blackhole_redirect, + .mtu = dst_blackhole_mtu, }; static const u32 ip6_template_metrics[RTAX_MAX] = {