* FAILED: patch "[PATCH] net: advertise TCP MSS from the configured MTU, not the" failed to apply to 6.12-stable tree
@ 2026-08-31 12:52 gregkh
2026-09-01 11:11 ` [PATCH 6.12.y 1/5] ipv6: start using dst_dev_rcu() Sasha Levin
0 siblings, 1 reply; 6+ messages in thread
From: gregkh @ 2026-08-31 12:52 UTC (permalink / raw)
To: jiayuan.chen, edumazet, kuba; +Cc: stable
The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 2640e64195948a601430d230c9864f5426574cde
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026083114-maturing-resize-d958@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 2640e64195948a601430d230c9864f5426574cde Mon Sep 17 00:00:00 2001
From: Jiayuan Chen <jiayuan.chen@linux.dev>
Date: Sat, 15 Aug 2026 15:03:36 +0800
Subject: [PATCH] net: advertise TCP MSS from the configured MTU, not the
learned PMTU
The MSS a host puts in its SYN tells the peer how big a segment it may
send us. Right now we can shrink it with a PMTU we learned on our own
send path, which is the wrong direction entirely.
On asymmetric paths this bites - think DSR load balancers, where the
request side goes through a smaller-MTU overlay. We learn a small PMTU
going out, then advertise a small MSS, and the peer stays capped for the
whole connection even though its path back to us is wide. MSS only shows
up in the SYN and never grows back.
On symmetric paths we lose nothing by dropping it either: the peer runs
its own PMTU discovery and usually already knows the real path MTU.
So work out the advertised MSS from the configured route or device MTU
and ignore the learned PMTU. Our send side is unchanged, still clamped by
tcp_current_mss(). Add ip_dst_mtu_configured()/ip6_dst_mtu_configured()
and use them from the two default_advmss() paths.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Fixes: 164a5e7ad531 ("ipv4: ipv4_default_advmss() should use route mtu")
Cc: stable@vger.kernel.org
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260815070413.294559-1-jiayuan.chen@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/include/net/ip.h b/include/net/ip.h
index 7f2fe1a8401b..a8f57b4f4aa2 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -506,6 +506,31 @@ static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
return res;
}
+/* Configured/administrative MTU of a route, for advertising the TCP MSS.
+ *
+ * Unlike ip_dst_mtu_maybe_forward(), this deliberately ignores the
+ * ICMP-learned path MTU (rt->rt_pmtu). The advertised MSS bounds what the
+ * peer may send to us and must reflect our receive capability (the device or
+ * route-configured MTU), not a path MTU learned on the reverse (send)
+ * direction, which may not apply to the peer->us path and outlives the fnhe
+ * for the whole connection. See RFC 2923 section 2.3 and the comment above
+ * tcp_advertise_mss().
+ */
+static inline unsigned int ip_dst_mtu_configured(const struct dst_entry *dst)
+{
+ unsigned int mtu, res;
+
+ rcu_read_lock();
+ mtu = dst_metric_raw(dst, RTAX_MTU);
+ if (!mtu)
+ mtu = READ_ONCE(dst_dev_rcu(dst)->mtu);
+ mtu = min_t(unsigned int, mtu, IP_MAX_MTU);
+ res = mtu - lwtunnel_headroom(dst->lwtstate, mtu);
+ rcu_read_unlock();
+
+ return res;
+}
+
static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
const struct sk_buff *skb)
{
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index cc045705862d..c69f1c871922 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -387,6 +387,43 @@ static inline unsigned int ip6_dst_mtu_maybe_forward(const struct dst_entry *dst
return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
}
+/* Configured/administrative MTU of a route, for advertising the TCP MSS.
+ *
+ * Unlike ip6_dst_mtu_maybe_forward(), this ignores any ICMPv6-learned path
+ * MTU (which is kept on the RTF_CACHE exception route) and returns the MTU of
+ * the underlying route (fib6_pmtu) or the egress device. The advertised MSS
+ * bounds what the peer may send to us and must reflect our receive
+ * capability, not a path MTU learned on the reverse (send) direction. See
+ * RFC 2923 section 2.3 and the comment above tcp_advertise_mss().
+ */
+static inline unsigned int ip6_dst_mtu_configured(const struct dst_entry *dst)
+{
+ const struct rt6_info *rt = dst_rt6_info(dst);
+ const struct fib6_info *from;
+ struct inet6_dev *idev;
+ unsigned int mtu = 0;
+
+ rcu_read_lock();
+ /* IPv6 keeps the learned PMTU and the configured MTU in the same
+ * RTAX_MTU slot: the learned value sits on this (possibly RTF_CACHE)
+ * dst, the configured one on the underlying route. Reach the latter
+ * via ->from (fib6_pmtu), populated by ip6_route_info_create().
+ */
+ from = rcu_dereference(rt->from);
+ if (from)
+ mtu = from->fib6_pmtu;
+ if (!mtu) {
+ mtu = IPV6_MIN_MTU;
+ idev = __in6_dev_get(dst_dev_rcu(dst));
+ if (idev)
+ mtu = max_t(unsigned int, mtu, READ_ONCE(idev->cnf.mtu6));
+ }
+ rcu_read_unlock();
+
+ mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
+ return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
+}
+
u32 ip6_mtu_from_fib6(const struct fib6_result *res,
const struct in6_addr *daddr,
const struct in6_addr *saddr);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 604cc51dfd9b..37674d76f90f 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1363,8 +1363,8 @@ static unsigned int ipv4_default_advmss(const struct dst_entry *dst)
rcu_read_lock();
net = dst_dev_net_rcu(dst);
- advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size,
- net->ipv4.ip_rt_min_advmss);
+ advmss = max_t(unsigned int, ip_dst_mtu_configured(dst) - header_size,
+ net->ipv4.ip_rt_min_advmss);
rcu_read_unlock();
return min(advmss, IPV4_MAX_PMTU - header_size);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 526535387512..93b4168044d9 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3261,7 +3261,7 @@ void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
static unsigned int ip6_default_advmss(const struct dst_entry *dst)
{
- unsigned int mtu = dst6_mtu(dst);
+ unsigned int mtu = ip6_dst_mtu_configured(dst);
struct net *net;
mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 6.12.y 1/5] ipv6: start using dst_dev_rcu()
2026-08-31 12:52 FAILED: patch "[PATCH] net: advertise TCP MSS from the configured MTU, not the" failed to apply to 6.12-stable tree gregkh
@ 2026-09-01 11:11 ` Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 2/5] ipv6: pass proto by value to ipv6_push_nfrag_opts() and ipv6_push_frag_opts() Sasha Levin
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Sasha Levin @ 2026-09-01 11:11 UTC (permalink / raw)
To: stable; +Cc: Eric Dumazet, David Ahern, Jakub Kicinski, Sasha Levin
From: Eric Dumazet <edumazet@google.com>
[ Upstream commit b775ecf1655cedbc465fd6699ab18a2bc4e7a352 ]
Refactor icmpv6_xrlim_allow() and ip6_dst_hoplimit()
so that we acquire rcu_read_lock() a bit longer
to be able to use dst_dev_rcu() instead of dst_dev().
__ip6_rt_update_pmtu() and rt6_do_redirect can directly
use dst_dev_rcu() in sections already holding rcu_read_lock().
Small changes to use dst_dev_net_rcu() in
ip6_default_advmss(), ipv6_sock_ac_join(),
ip6_mc_find_dev() and ndisc_send_skb().
Fixes: 4a6ce2b6f2ec ("net: introduce a new function dst_dev_put()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250828195823.3958522-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 2640e6419594 ("net: advertise TCP MSS from the configured MTU, not the learned PMTU")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/ip6_route.h | 3 +++
net/ipv6/anycast.c | 4 +++-
net/ipv6/icmp.c | 6 +++---
net/ipv6/mcast.c | 4 +++-
net/ipv6/ndisc.c | 2 +-
net/ipv6/output_core.c | 8 +++++---
net/ipv6/route.c | 9 ++++-----
7 files changed, 22 insertions(+), 14 deletions(-)
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 59f48ca3abdf5..07c87c239511e 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -266,6 +266,9 @@ static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
int (*output)(struct net *, struct sock *, struct sk_buff *));
+/* Compatibility form of the later IPv6-specific dst_mtu() wrapper. */
+#define dst6_mtu(dst) dst_mtu(dst)
+
static inline unsigned int ip6_skb_dst_mtu(const struct sk_buff *skb)
{
const struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 0627c4c18d1a5..97c72dc541fd6 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -94,7 +94,9 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
if (rt) {
- dev = rt->dst.dev;
+ rcu_read_lock();
+ dev = dst_dev_rcu(&rt->dst);
+ rcu_read_unlock();
ip6_rt_put(rt);
} else if (ishost) {
err = -EADDRNOTAVAIL;
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 229ae205450d3..e4e40f0694238 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -209,7 +209,8 @@ static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
* this lookup should be more aggressive (not longer than timeout).
*/
dst = ip6_route_output(net, sk, fl6);
- dev = dst_dev(dst);
+ rcu_read_lock();
+ dev = dst_dev_rcu(dst);
if (dst->error) {
IP6_INC_STATS(net, ip6_dst_idev(dst),
IPSTATS_MIB_OUTNOROUTES);
@@ -224,11 +225,10 @@ static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
if (rt->rt6i_dst.plen < 128)
tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
- rcu_read_lock();
peer = inet_getpeer_v6(net->ipv6.peers, &fl6->daddr);
res = inet_peer_xrlim_allow(peer, tmo);
- rcu_read_unlock();
}
+ rcu_read_unlock();
if (!res)
__ICMP6_INC_STATS(net, ip6_dst_idev(dst),
ICMP6_MIB_RATELIMITHOST);
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 92f321635e4ec..335546d77f39c 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -201,7 +201,9 @@ static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
struct rt6_info *rt;
rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
if (rt) {
- dev = rt->dst.dev;
+ rcu_read_lock();
+ dev = dst_dev_rcu(&rt->dst);
+ rcu_read_unlock();
ip6_rt_put(rt);
}
} else
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 87bed84a00532..26ad7cab0383f 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -508,7 +508,7 @@ void ndisc_send_skb(struct sk_buff *skb, const struct in6_addr *daddr,
ip6_nd_hdr(skb, saddr, daddr, READ_ONCE(inet6_sk(sk)->hop_limit), skb->len);
- dev = dst_dev(dst);
+ dev = dst_dev_rcu(dst);
idev = __in6_dev_get(dev);
IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index 90a178dd24aae..5be101401a00e 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -104,18 +104,20 @@ EXPORT_SYMBOL(ip6_find_1stfragopt);
int ip6_dst_hoplimit(struct dst_entry *dst)
{
int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
+
+ rcu_read_lock();
if (hoplimit == 0) {
- struct net_device *dev = dst_dev(dst);
+ struct net_device *dev = dst_dev_rcu(dst);
struct inet6_dev *idev;
- rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev)
hoplimit = READ_ONCE(idev->cnf.hop_limit);
else
hoplimit = READ_ONCE(dev_net(dev)->ipv6.devconf_all->hop_limit);
- rcu_read_unlock();
}
+ rcu_read_unlock();
+
return hoplimit;
}
EXPORT_SYMBOL(ip6_dst_hoplimit);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e602dd3e7ee39..eb2ba7c34f6f8 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2949,7 +2949,7 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
if (res.f6i->nh) {
struct fib6_nh_match_arg arg = {
- .dev = dst_dev(dst),
+ .dev = dst_dev_rcu(dst),
.gw = &rt6->rt6i_gateway,
};
@@ -3244,15 +3244,14 @@ EXPORT_SYMBOL_GPL(ip6_sk_redirect);
static unsigned int ip6_default_advmss(const struct dst_entry *dst)
{
- struct net_device *dev = dst_dev(dst);
- unsigned int mtu = dst_mtu(dst);
+ unsigned int mtu = dst6_mtu(dst);
struct net *net;
mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
rcu_read_lock();
- net = dev_net_rcu(dev);
+ net = dst_dev_net_rcu(dst);
if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
@@ -4266,7 +4265,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
if (res.f6i->nh) {
struct fib6_nh_match_arg arg = {
- .dev = dst_dev(dst),
+ .dev = dst_dev_rcu(dst),
.gw = &rt->rt6i_gateway,
};
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 6.12.y 2/5] ipv6: pass proto by value to ipv6_push_nfrag_opts() and ipv6_push_frag_opts()
2026-09-01 11:11 ` [PATCH 6.12.y 1/5] ipv6: start using dst_dev_rcu() Sasha Levin
@ 2026-09-01 11:11 ` Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 3/5] ipv6: add some unlikely()/likely() clauses in ip6_output.c Sasha Levin
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Sasha Levin @ 2026-09-01 11:11 UTC (permalink / raw)
To: stable; +Cc: Eric Dumazet, Kuniyuki Iwashima, Jakub Kicinski, Sasha Levin
From: Eric Dumazet <edumazet@google.com>
[ Upstream commit 1bc46dd209667346c5aa56c351995e7c260696d0 ]
With CONFIG_STACKPROTECTOR_STRONG=y, it is better to avoid passing
a pointer to an automatic variable.
Change these exported functions to return 'u8 proto'
instead of void.
- ipv6_push_nfrag_opts()
- ipv6_push_frag_opts()
For instance, replace
ipv6_push_frag_opts(skb, opt, &proto);
with:
proto = ipv6_push_frag_opts(skb, opt, proto);
Note that even after this change, ip6_xmit() has to use a stack canary
because of @first_hop variable.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260130210303.3888261-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 2640e6419594 ("net: advertise TCP MSS from the configured MTU, not the learned PMTU")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/ipv6.h | 10 ++++----
net/ipv6/exthdrs.c | 55 +++++++++++++++++++++++--------------------
net/ipv6/ip6_output.c | 19 ++++++++-------
net/ipv6/ip6_tunnel.c | 2 +-
4 files changed, 46 insertions(+), 40 deletions(-)
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index e843eb7efbccd..3f3e312bced4f 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1142,11 +1142,11 @@ int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
* Extension header (options) processing
*/
-void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
- u8 *proto, struct in6_addr **daddr_p,
- struct in6_addr *saddr);
-void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
- u8 *proto);
+u8 ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
+ u8 proto, struct in6_addr **daddr_p,
+ struct in6_addr *saddr);
+u8 ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
+ u8 proto);
int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
__be16 *frag_offp);
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index e91afe5ec0b5d..1a39824ae9630 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -1103,9 +1103,9 @@ int ipv6_parse_hopopts(struct sk_buff *skb)
* for headers.
*/
-static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto,
- struct ipv6_rt_hdr *opt,
- struct in6_addr **addr_p, struct in6_addr *saddr)
+static u8 ipv6_push_rthdr0(struct sk_buff *skb, u8 proto,
+ struct ipv6_rt_hdr *opt,
+ struct in6_addr **addr_p, struct in6_addr *saddr)
{
struct rt0_hdr *phdr, *ihdr;
int hops;
@@ -1124,13 +1124,13 @@ static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto,
phdr->addr[hops - 1] = **addr_p;
*addr_p = ihdr->addr;
- phdr->rt_hdr.nexthdr = *proto;
- *proto = NEXTHDR_ROUTING;
+ phdr->rt_hdr.nexthdr = proto;
+ return NEXTHDR_ROUTING;
}
-static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto,
- struct ipv6_rt_hdr *opt,
- struct in6_addr **addr_p, struct in6_addr *saddr)
+static u8 ipv6_push_rthdr4(struct sk_buff *skb, u8 proto,
+ struct ipv6_rt_hdr *opt,
+ struct in6_addr **addr_p, struct in6_addr *saddr)
{
struct ipv6_sr_hdr *sr_phdr, *sr_ihdr;
int plen, hops;
@@ -1173,58 +1173,61 @@ static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto,
}
#endif
- sr_phdr->nexthdr = *proto;
- *proto = NEXTHDR_ROUTING;
+ sr_phdr->nexthdr = proto;
+ return NEXTHDR_ROUTING;
}
-static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
- struct ipv6_rt_hdr *opt,
- struct in6_addr **addr_p, struct in6_addr *saddr)
+static u8 ipv6_push_rthdr(struct sk_buff *skb, u8 proto,
+ struct ipv6_rt_hdr *opt,
+ struct in6_addr **addr_p, struct in6_addr *saddr)
{
switch (opt->type) {
case IPV6_SRCRT_TYPE_0:
case IPV6_SRCRT_STRICT:
case IPV6_SRCRT_TYPE_2:
- ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr);
+ proto = ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr);
break;
case IPV6_SRCRT_TYPE_4:
- ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr);
+ proto = ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr);
break;
default:
break;
}
+ return proto;
}
-static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
+static u8 ipv6_push_exthdr(struct sk_buff *skb, u8 proto, u8 type, struct ipv6_opt_hdr *opt)
{
struct ipv6_opt_hdr *h = skb_push(skb, ipv6_optlen(opt));
memcpy(h, opt, ipv6_optlen(opt));
- h->nexthdr = *proto;
- *proto = type;
+ h->nexthdr = proto;
+ return type;
}
-void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
- u8 *proto,
- struct in6_addr **daddr, struct in6_addr *saddr)
+u8 ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
+ u8 proto,
+ struct in6_addr **daddr, struct in6_addr *saddr)
{
if (opt->srcrt) {
- ipv6_push_rthdr(skb, proto, opt->srcrt, daddr, saddr);
+ proto = ipv6_push_rthdr(skb, proto, opt->srcrt, daddr, saddr);
/*
* IPV6_RTHDRDSTOPTS is ignored
* unless IPV6_RTHDR is set (RFC3542).
*/
if (opt->dst0opt)
- ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
+ proto = ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
}
if (opt->hopopt)
- ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
+ proto = ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
+ return proto;
}
-void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
+u8 ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 proto)
{
if (opt->dst1opt)
- ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
+ proto = ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
+ return proto;
}
EXPORT_SYMBOL(ipv6_push_frag_opts);
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index fd25d5aadea27..2f4858fc2d489 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -305,11 +305,12 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
seg_len += opt->opt_nflen + opt->opt_flen;
if (opt->opt_flen)
- ipv6_push_frag_opts(skb, opt, &proto);
+ proto = ipv6_push_frag_opts(skb, opt, proto);
if (opt->opt_nflen)
- ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop,
- &fl6->saddr);
+ proto = ipv6_push_nfrag_opts(skb, opt, proto,
+ &first_hop,
+ &fl6->saddr);
}
if (unlikely(seg_len > IPV6_MAXPLEN)) {
@@ -1927,11 +1928,13 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
__skb_pull(skb, skb_network_header_len(skb));
final_dst = &fl6->daddr;
- if (opt && opt->opt_flen)
- ipv6_push_frag_opts(skb, opt, &proto);
- if (opt && opt->opt_nflen)
- ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst, &fl6->saddr);
-
+ if (opt) {
+ if (opt->opt_flen)
+ proto = ipv6_push_frag_opts(skb, opt, proto);
+ if (opt->opt_nflen)
+ proto = ipv6_push_nfrag_opts(skb, opt, proto,
+ &final_dst, &fl6->saddr);
+ }
skb_push(skb, sizeof(struct ipv6hdr));
skb_reset_network_header(skb);
hdr = ipv6_hdr(skb);
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 1446c4eae681b..43ccc1a0a0d04 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1273,7 +1273,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
if (encap_limit >= 0) {
init_tel_txopt(&opt, encap_limit);
- ipv6_push_frag_opts(skb, &opt.ops, &proto);
+ proto = ipv6_push_frag_opts(skb, &opt.ops, proto);
}
skb_push(skb, sizeof(struct ipv6hdr));
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 6.12.y 3/5] ipv6: add some unlikely()/likely() clauses in ip6_output.c
2026-09-01 11:11 ` [PATCH 6.12.y 1/5] ipv6: start using dst_dev_rcu() Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 2/5] ipv6: pass proto by value to ipv6_push_nfrag_opts() and ipv6_push_frag_opts() Sasha Levin
@ 2026-09-01 11:11 ` Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 4/5] ipv6: use dst6_mtu() instead of dst_mtu() Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 5/5] net: advertise TCP MSS from the configured MTU, not the learned PMTU Sasha Levin
3 siblings, 0 replies; 6+ messages in thread
From: Sasha Levin @ 2026-09-01 11:11 UTC (permalink / raw)
To: stable; +Cc: Eric Dumazet, Kuniyuki Iwashima, Jakub Kicinski, Sasha Levin
From: Eric Dumazet <edumazet@google.com>
[ Upstream commit 2855e4925416c5900a9c6cece11f4a2e56bf6e63 ]
1) daddr is unlikely a multicast in ip6_finish_output2().
2) ip6_finish_output_gso_slowpath_drop() should not be called often.
3) ip6_fragment() should not be called often.
4) opt is unlikely to be set.
5) ip6_xmit() and ip6_forward() mostly sends not too big packets.
6) Most __ip6_make_skb() calls are for UDP packets,
not ICMPV6 ones.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260130210303.3888261-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 2640e6419594 ("net: advertise TCP MSS from the configured MTU, not the learned PMTU")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/ipv6/ip6_output.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 2f4858fc2d489..c1227bfeb8496 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -83,7 +83,7 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *
hdr = ipv6_hdr(skb);
daddr = &hdr->daddr;
- if (ipv6_addr_is_multicast(daddr)) {
+ if (unlikely(ipv6_addr_is_multicast(daddr))) {
if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&
((mroute6_is_socket(net, skb) &&
!(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
@@ -187,8 +187,8 @@ ip6_finish_output_gso_slowpath_drop(struct net *net, struct sock *sk,
static int ip6_finish_output_gso(struct net *net, struct sock *sk,
struct sk_buff *skb, unsigned int mtu)
{
- if (!(IP6CB(skb)->flags & IP6SKB_FAKEJUMBO) &&
- !skb_gso_validate_network_len(skb, mtu))
+ if (unlikely(!(IP6CB(skb)->flags & IP6SKB_FAKEJUMBO) &&
+ !skb_gso_validate_network_len(skb, mtu)))
return ip6_finish_output_gso_slowpath_drop(net, sk, skb, mtu);
return ip6_finish_output2(net, sk, skb);
@@ -210,8 +210,8 @@ static int __ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff
if (skb_is_gso(skb))
return ip6_finish_output_gso(net, sk, skb, mtu);
- if (skb->len > mtu ||
- (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
+ if (unlikely(skb->len > mtu ||
+ (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size)))
return ip6_fragment(net, sk, skb, ip6_finish_output2);
return ip6_finish_output2(net, sk, skb);
@@ -301,7 +301,7 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
}
}
- if (opt) {
+ if (unlikely(opt)) {
seg_len += opt->opt_nflen + opt->opt_flen;
if (opt->opt_flen)
@@ -354,7 +354,7 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
skb->mark = mark;
mtu = dst_mtu(dst);
- if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {
+ if (likely((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb))) {
IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
/* if egress device is enslaved to an L3 master device pass the
@@ -653,7 +653,7 @@ int ip6_forward(struct sk_buff *skb)
if (mtu < IPV6_MIN_MTU)
mtu = IPV6_MIN_MTU;
- if (ip6_pkt_too_big(skb, mtu)) {
+ if (unlikely(ip6_pkt_too_big(skb, mtu))) {
/* Again, force OUTPUT device used as source address */
skb->dev = dev;
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
@@ -1365,7 +1365,7 @@ static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
/*
* setup for corking
*/
- if (opt) {
+ if (unlikely(opt)) {
if (WARN_ON(v6_cork->opt))
return -EINVAL;
@@ -1872,7 +1872,7 @@ static void ip6_cork_steal_dst(struct sk_buff *skb, struct inet_cork_full *cork)
static void ip6_cork_release(struct inet_cork_full *cork,
struct inet6_cork *v6_cork)
{
- if (v6_cork->opt) {
+ if (unlikely(v6_cork->opt)) {
struct ipv6_txoptions *opt = v6_cork->opt;
kfree(opt->dst0opt);
@@ -1928,7 +1928,7 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
__skb_pull(skb, skb_network_header_len(skb));
final_dst = &fl6->daddr;
- if (opt) {
+ if (unlikely(opt)) {
if (opt->opt_flen)
proto = ipv6_push_frag_opts(skb, opt, proto);
if (opt->opt_nflen)
@@ -1956,7 +1956,7 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
ip6_cork_steal_dst(skb, cork);
IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
- if (proto == IPPROTO_ICMPV6) {
+ if (unlikely(proto == IPPROTO_ICMPV6)) {
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
u8 icmp6_type;
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 6.12.y 4/5] ipv6: use dst6_mtu() instead of dst_mtu()
2026-09-01 11:11 ` [PATCH 6.12.y 1/5] ipv6: start using dst_dev_rcu() Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 2/5] ipv6: pass proto by value to ipv6_push_nfrag_opts() and ipv6_push_frag_opts() Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 3/5] ipv6: add some unlikely()/likely() clauses in ip6_output.c Sasha Levin
@ 2026-09-01 11:11 ` Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 5/5] net: advertise TCP MSS from the configured MTU, not the learned PMTU Sasha Levin
3 siblings, 0 replies; 6+ messages in thread
From: Sasha Levin @ 2026-09-01 11:11 UTC (permalink / raw)
To: stable; +Cc: Eric Dumazet, Kuniyuki Iwashima, Jakub Kicinski, Sasha Levin
From: Eric Dumazet <edumazet@google.com>
[ Upstream commit b40f0130a23b6bab8b359e158a40af81f11f14be ]
When we expect an IPv6 dst, use dst6_mtu() instead of dst_mtu()
to save some code space.
Due to current dst6_mtu() implementation, only convert
users in IPv6 stack.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260130210303.3888261-7-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 2640e6419594 ("net: advertise TCP MSS from the configured MTU, not the learned PMTU")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/ipv6/ip6_gre.c | 2 +-
net/ipv6/ip6_output.c | 6 +++---
net/ipv6/ip6_tunnel.c | 4 ++--
net/ipv6/ipv6_sockglue.c | 4 ++--
net/ipv6/route.c | 8 +++++---
net/ipv6/tcp_ipv6.c | 9 +++++----
6 files changed, 18 insertions(+), 15 deletions(-)
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index dac2e589849df..cf7e5d1046672 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1086,7 +1086,7 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
/* TooBig packet may have updated dst->dev's mtu */
if (!t->parms.collect_md && dst) {
mtu = READ_ONCE(dst_dev(dst)->mtu);
- if (dst_mtu(dst) > mtu)
+ if (dst6_mtu(dst) > mtu)
dst->ops->update_pmtu(dst, NULL, skb, mtu, false);
}
err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index c1227bfeb8496..e483ea209fb76 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -353,7 +353,7 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
skb->priority = priority;
skb->mark = mark;
- mtu = dst_mtu(dst);
+ mtu = dst6_mtu(dst);
if (likely((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb))) {
IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
@@ -1400,10 +1400,10 @@ static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
v6_cork->dontfrag = ipc6->dontfrag;
if (rt->dst.flags & DST_XFRM_TUNNEL)
mtu = READ_ONCE(np->pmtudisc) >= IPV6_PMTUDISC_PROBE ?
- READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst);
+ READ_ONCE(rt->dst.dev->mtu) : dst6_mtu(&rt->dst);
else
mtu = READ_ONCE(np->pmtudisc) >= IPV6_PMTUDISC_PROBE ?
- READ_ONCE(rt->dst.dev->mtu) : dst_mtu(xfrm_dst_path(&rt->dst));
+ READ_ONCE(rt->dst.dev->mtu) : dst6_mtu(xfrm_dst_path(&rt->dst));
frag_size = READ_ONCE(np->frag_size);
if (frag_size && frag_size < mtu)
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 43ccc1a0a0d04..60b2583a8b2b4 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -643,7 +643,7 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
/* change mtu on this route */
if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
- if (rel_info > dst_mtu(skb_dst(skb2)))
+ if (rel_info > dst6_mtu(skb_dst(skb2)))
goto out;
skb_dst_update_pmtu_no_confirm(skb2, rel_info);
@@ -1195,7 +1195,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
t->parms.name);
goto tx_err_dst_release;
}
- mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
+ mtu = dst6_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
if (encap_limit >= 0) {
max_headroom += 8;
mtu -= 8;
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 1e225e6489ea1..c2ea92c0f9166 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -1204,7 +1204,7 @@ int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
rcu_read_lock();
dst = __sk_dst_get(sk);
if (dst)
- val = dst_mtu(dst);
+ val = dst6_mtu(dst);
rcu_read_unlock();
if (!val)
return -ENOTCONN;
@@ -1303,7 +1303,7 @@ int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
rcu_read_lock();
dst = __sk_dst_get(sk);
if (dst)
- mtuinfo.ip6m_mtu = dst_mtu(dst);
+ mtuinfo.ip6m_mtu = dst6_mtu(dst);
rcu_read_unlock();
if (!mtuinfo.ip6m_mtu)
return -ENOTCONN;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index eb2ba7c34f6f8..f7a138e317bad 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2051,6 +2051,8 @@ static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
struct rt6_info *rt, int mtu)
{
+ u32 dmtu = dst6_mtu(&rt->dst);
+
/* If the new MTU is lower than the route PMTU, this new MTU will be the
* lowest MTU in the path: always allow updating the route PMTU to
* reflect PMTU decreases.
@@ -2061,10 +2063,10 @@ static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
* handle this.
*/
- if (dst_mtu(&rt->dst) >= mtu)
+ if (dmtu >= mtu)
return true;
- if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
+ if (dmtu == idev->cnf.mtu6)
return true;
return false;
@@ -2927,7 +2929,7 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
if (mtu < IPV6_MIN_MTU)
return;
- if (mtu >= dst_mtu(dst))
+ if (mtu >= dst6_mtu(dst))
return;
if (!rt6_cache_allowed_for_pmtu(rt6)) {
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 085fc97c5a5b3..b6190f09551d5 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -347,7 +347,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
static void tcp_v6_mtu_reduced(struct sock *sk)
{
struct dst_entry *dst;
- u32 mtu;
+ u32 mtu, dmtu;
if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
return;
@@ -364,8 +364,9 @@ static void tcp_v6_mtu_reduced(struct sock *sk)
if (!dst)
return;
- if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
- tcp_sync_mss(sk, dst_mtu(dst));
+ dmtu = dst6_mtu(dst);
+ if (inet_csk(sk)->icsk_pmtu_cookie > dmtu) {
+ tcp_sync_mss(sk, dmtu);
tcp_simple_retransmit(sk);
}
}
@@ -1500,7 +1501,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
tcp_ca_openreq_child(newsk, dst);
- tcp_sync_mss(newsk, dst_mtu(dst));
+ tcp_sync_mss(newsk, dst6_mtu(dst));
newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst));
tcp_initialize_rcv_mss(newsk);
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 6.12.y 5/5] net: advertise TCP MSS from the configured MTU, not the learned PMTU
2026-09-01 11:11 ` [PATCH 6.12.y 1/5] ipv6: start using dst_dev_rcu() Sasha Levin
` (2 preceding siblings ...)
2026-09-01 11:11 ` [PATCH 6.12.y 4/5] ipv6: use dst6_mtu() instead of dst_mtu() Sasha Levin
@ 2026-09-01 11:11 ` Sasha Levin
3 siblings, 0 replies; 6+ messages in thread
From: Sasha Levin @ 2026-09-01 11:11 UTC (permalink / raw)
To: stable; +Cc: Jiayuan Chen, Eric Dumazet, Jakub Kicinski, Sasha Levin
From: Jiayuan Chen <jiayuan.chen@linux.dev>
[ Upstream commit 2640e64195948a601430d230c9864f5426574cde ]
The MSS a host puts in its SYN tells the peer how big a segment it may
send us. Right now we can shrink it with a PMTU we learned on our own
send path, which is the wrong direction entirely.
On asymmetric paths this bites - think DSR load balancers, where the
request side goes through a smaller-MTU overlay. We learn a small PMTU
going out, then advertise a small MSS, and the peer stays capped for the
whole connection even though its path back to us is wide. MSS only shows
up in the SYN and never grows back.
On symmetric paths we lose nothing by dropping it either: the peer runs
its own PMTU discovery and usually already knows the real path MTU.
So work out the advertised MSS from the configured route or device MTU
and ignore the learned PMTU. Our send side is unchanged, still clamped by
tcp_current_mss(). Add ip_dst_mtu_configured()/ip6_dst_mtu_configured()
and use them from the two default_advmss() paths.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Fixes: 164a5e7ad531 ("ipv4: ipv4_default_advmss() should use route mtu")
Cc: stable@vger.kernel.org
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260815070413.294559-1-jiayuan.chen@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/ip.h | 25 +++++++++++++++++++++++++
include/net/ip6_route.h | 37 +++++++++++++++++++++++++++++++++++++
net/ipv4/route.c | 4 ++--
net/ipv6/route.c | 2 +-
4 files changed, 65 insertions(+), 3 deletions(-)
diff --git a/include/net/ip.h b/include/net/ip.h
index 39c6a4033aeda..d8ce127278367 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -508,6 +508,31 @@ static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
return res;
}
+/* Configured/administrative MTU of a route, for advertising the TCP MSS.
+ *
+ * Unlike ip_dst_mtu_maybe_forward(), this deliberately ignores the
+ * ICMP-learned path MTU (rt->rt_pmtu). The advertised MSS bounds what the
+ * peer may send to us and must reflect our receive capability (the device or
+ * route-configured MTU), not a path MTU learned on the reverse (send)
+ * direction, which may not apply to the peer->us path and outlives the fnhe
+ * for the whole connection. See RFC 2923 section 2.3 and the comment above
+ * tcp_advertise_mss().
+ */
+static inline unsigned int ip_dst_mtu_configured(const struct dst_entry *dst)
+{
+ unsigned int mtu, res;
+
+ rcu_read_lock();
+ mtu = dst_metric_raw(dst, RTAX_MTU);
+ if (!mtu)
+ mtu = READ_ONCE(dst_dev_rcu(dst)->mtu);
+ mtu = min_t(unsigned int, mtu, IP_MAX_MTU);
+ res = mtu - lwtunnel_headroom(dst->lwtstate, mtu);
+ rcu_read_unlock();
+
+ return res;
+}
+
static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
const struct sk_buff *skb)
{
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 07c87c239511e..4806529ee2105 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -349,6 +349,43 @@ static inline unsigned int ip6_dst_mtu_maybe_forward(const struct dst_entry *dst
return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
}
+/* Configured/administrative MTU of a route, for advertising the TCP MSS.
+ *
+ * Unlike ip6_dst_mtu_maybe_forward(), this ignores any ICMPv6-learned path
+ * MTU (which is kept on the RTF_CACHE exception route) and returns the MTU of
+ * the underlying route (fib6_pmtu) or the egress device. The advertised MSS
+ * bounds what the peer may send to us and must reflect our receive
+ * capability, not a path MTU learned on the reverse (send) direction. See
+ * RFC 2923 section 2.3 and the comment above tcp_advertise_mss().
+ */
+static inline unsigned int ip6_dst_mtu_configured(const struct dst_entry *dst)
+{
+ const struct rt6_info *rt = dst_rt6_info(dst);
+ const struct fib6_info *from;
+ struct inet6_dev *idev;
+ unsigned int mtu = 0;
+
+ rcu_read_lock();
+ /* IPv6 keeps the learned PMTU and the configured MTU in the same
+ * RTAX_MTU slot: the learned value sits on this (possibly RTF_CACHE)
+ * dst, the configured one on the underlying route. Reach the latter
+ * via ->from (fib6_pmtu), populated by ip6_route_info_create().
+ */
+ from = rcu_dereference(rt->from);
+ if (from)
+ mtu = from->fib6_pmtu;
+ if (!mtu) {
+ mtu = IPV6_MIN_MTU;
+ idev = __in6_dev_get(dst_dev_rcu(dst));
+ if (idev)
+ mtu = max_t(unsigned int, mtu, READ_ONCE(idev->cnf.mtu6));
+ }
+ rcu_read_unlock();
+
+ mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
+ return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
+}
+
u32 ip6_mtu_from_fib6(const struct fib6_result *res,
const struct in6_addr *daddr,
const struct in6_addr *saddr);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 9135a9dc8f297..e27486313c04a 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1356,8 +1356,8 @@ static unsigned int ipv4_default_advmss(const struct dst_entry *dst)
rcu_read_lock();
net = dst_dev_net_rcu(dst);
- advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size,
- net->ipv4.ip_rt_min_advmss);
+ advmss = max_t(unsigned int, ip_dst_mtu_configured(dst) - header_size,
+ net->ipv4.ip_rt_min_advmss);
rcu_read_unlock();
return min(advmss, IPV4_MAX_PMTU - header_size);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f7a138e317bad..20924262434e5 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3246,7 +3246,7 @@ EXPORT_SYMBOL_GPL(ip6_sk_redirect);
static unsigned int ip6_default_advmss(const struct dst_entry *dst)
{
- unsigned int mtu = dst6_mtu(dst);
+ unsigned int mtu = ip6_dst_mtu_configured(dst);
struct net *net;
mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
--
2.53.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2026-09-01 11:11 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-08-31 12:52 FAILED: patch "[PATCH] net: advertise TCP MSS from the configured MTU, not the" failed to apply to 6.12-stable tree gregkh
2026-09-01 11:11 ` [PATCH 6.12.y 1/5] ipv6: start using dst_dev_rcu() Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 2/5] ipv6: pass proto by value to ipv6_push_nfrag_opts() and ipv6_push_frag_opts() Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 3/5] ipv6: add some unlikely()/likely() clauses in ip6_output.c Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 4/5] ipv6: use dst6_mtu() instead of dst_mtu() Sasha Levin
2026-09-01 11:11 ` [PATCH 6.12.y 5/5] net: advertise TCP MSS from the configured MTU, not the learned PMTU Sasha Levin
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