From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org
Cc: Eric Dumazet <edumazet@google.com>,
Kuniyuki Iwashima <kuniyu@google.com>,
Jakub Kicinski <kuba@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.12.y 1/3] ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers
Date: Tue, 8 Sep 2026 13:25:23 -0400 [thread overview]
Message-ID: <20260908172525.78441-1-sashal@kernel.org> (raw)
In-Reply-To: <2026090318-afterglow-hash-e60c@gregkh>
From: Eric Dumazet <edumazet@google.com>
[ Upstream commit 93d1cff35adc522a5d21e722eee1071f3f7dc716 ]
Use the new helpers as a step to deal with potential dst->dev races.
v2: fix typo in ipv6_rthdr_rcv() (kernel test robot <lkp@intel.com>)
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250630121934.3399505-10-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: e36ce6e78fe3 ("ip: orphan prefetched skbs before multicast forwarding")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/inet6_hashtables.h | 2 +-
include/net/ip6_tunnel.h | 2 +-
net/ipv6/exthdrs.c | 8 ++++----
net/ipv6/ioam6.c | 17 +++++++++--------
net/ipv6/ip6_input.c | 6 ++++--
net/ipv6/ip6_output.c | 5 +++--
net/ipv6/ip6_tunnel.c | 2 +-
net/ipv6/ip6_vti.c | 2 +-
net/ipv6/netfilter.c | 4 ++--
net/ipv6/netfilter/nf_reject_ipv6.c | 2 +-
net/ipv6/output_core.c | 2 +-
net/ipv6/reassembly.c | 10 +++++-----
net/ipv6/route.c | 4 ++--
net/ipv6/seg6_iptunnel.c | 6 +++---
net/ipv6/tcp_ipv6.c | 4 ++--
net/ipv6/xfrm6_output.c | 2 +-
16 files changed, 41 insertions(+), 37 deletions(-)
diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index c32878c69179d..ab3929a2a9569 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -150,7 +150,7 @@ static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
int iif, int sdif,
bool *refcounted)
{
- struct net *net = dev_net_rcu(skb_dst(skb)->dev);
+ struct net *net = skb_dst_dev_net_rcu(skb);
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct sock *sk;
diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
index 17913fca5445a..b4ddfe4b97508 100644
--- a/include/net/ip6_tunnel.h
+++ b/include/net/ip6_tunnel.h
@@ -170,7 +170,7 @@ static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
pkt_len = skb->len - skb_inner_network_offset(skb);
- err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
+ err = ip6_local_out(skb_dst_dev_net(skb), sk, skb);
if (dev) {
if (unlikely(net_xmit_eval(err)))
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index e91afe5ec0b5d..ff8789d10b4f8 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -469,7 +469,7 @@ static int ipv6_srh_rcv(struct sk_buff *skb)
return -1;
}
- if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) {
+ if (skb_dst_dev(skb)->flags & IFF_LOOPBACK) {
if (ipv6_hdr(skb)->hop_limit <= 1) {
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
icmpv6_send(skb, ICMPV6_TIME_EXCEED,
@@ -633,7 +633,7 @@ static int ipv6_rpl_srh_rcv(struct sk_buff *skb)
return -1;
}
- if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) {
+ if (skb_dst_dev(skb)->flags & IFF_LOOPBACK) {
if (ipv6_hdr(skb)->hop_limit <= 1) {
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
icmpv6_send(skb, ICMPV6_TIME_EXCEED,
@@ -795,7 +795,7 @@ static int ipv6_rthdr_rcv(struct sk_buff *skb)
kfree_skb(skb);
return -1;
}
- if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) {
+ if (!ipv6_chk_home_addr(skb_dst_dev_net(skb), addr)) {
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
kfree_skb(skb);
return -1;
@@ -821,7 +821,7 @@ static int ipv6_rthdr_rcv(struct sk_buff *skb)
return -1;
}
- if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) {
+ if (skb_dst_dev(skb)->flags & IFF_LOOPBACK) {
if (ipv6_hdr(skb)->hop_limit <= 1) {
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
diff --git a/net/ipv6/ioam6.c b/net/ipv6/ioam6.c
index 868a25c57b924..bea2cf0163074 100644
--- a/net/ipv6/ioam6.c
+++ b/net/ipv6/ioam6.c
@@ -714,6 +714,7 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
struct ioam6_schema *sc,
unsigned int sclen, bool is_input)
{
+ struct net_device *dev = skb_dst_dev(skb);
struct timespec64 ts;
ktime_t tstamp;
u64 raw64;
@@ -730,7 +731,7 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
if (is_input)
byte--;
- raw32 = dev_net(skb_dst(skb)->dev)->ipv6.sysctl.ioam6_id;
+ raw32 = dev_net(dev)->ipv6.sysctl.ioam6_id;
*(__be32 *)data = cpu_to_be32((byte << 24) | raw32);
data += sizeof(__be32);
@@ -746,10 +747,10 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
*(__be16 *)data = cpu_to_be16(raw16);
data += sizeof(__be16);
- if (skb_dst(skb)->dev->flags & IFF_LOOPBACK)
+ if (dev->flags & IFF_LOOPBACK)
raw16 = IOAM6_U16_UNAVAILABLE;
else
- raw16 = (__force u16)READ_ONCE(__in6_dev_get(skb_dst(skb)->dev)->cnf.ioam6_id);
+ raw16 = (__force u16)READ_ONCE(__in6_dev_get(dev)->cnf.ioam6_id);
*(__be16 *)data = cpu_to_be16(raw16);
data += sizeof(__be16);
@@ -801,10 +802,10 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
struct Qdisc *qdisc;
__u32 qlen, backlog;
- if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) {
+ if (dev->flags & IFF_LOOPBACK) {
*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
} else {
- queue = skb_get_tx_queue(skb_dst(skb)->dev, skb);
+ queue = skb_get_tx_queue(dev, skb);
qdisc = rcu_dereference(queue->qdisc);
qdisc_qstats_qlen_backlog(qdisc, &qlen, &backlog);
@@ -825,7 +826,7 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
if (is_input)
byte--;
- raw64 = dev_net(skb_dst(skb)->dev)->ipv6.sysctl.ioam6_id_wide;
+ raw64 = dev_net(dev)->ipv6.sysctl.ioam6_id_wide;
*(__be64 *)data = cpu_to_be64(((u64)byte << 56) | raw64);
data += sizeof(__be64);
@@ -841,10 +842,10 @@ static void __ioam6_fill_trace_data(struct sk_buff *skb,
*(__be32 *)data = cpu_to_be32(raw32);
data += sizeof(__be32);
- if (skb_dst(skb)->dev->flags & IFF_LOOPBACK)
+ if (dev->flags & IFF_LOOPBACK)
raw32 = IOAM6_U32_UNAVAILABLE;
else
- raw32 = READ_ONCE(__in6_dev_get(skb_dst(skb)->dev)->cnf.ioam6_id_wide);
+ raw32 = READ_ONCE(__in6_dev_get(dev)->cnf.ioam6_id_wide);
*(__be32 *)data = cpu_to_be32(raw32);
data += sizeof(__be32);
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 70c0e16c0ae68..a754aead9d56f 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -187,7 +187,9 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
* arrived via the sending interface (ethX), because of the
* nature of scoping architecture. --yoshfuji
*/
- IP6CB(skb)->iif = skb_valid_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;
+ IP6CB(skb)->iif = skb_valid_dst(skb) ?
+ ip6_dst_idev(skb_dst(skb))->dev->ifindex :
+ dev->ifindex;
if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
goto err;
@@ -500,7 +502,7 @@ int ip6_mc_input(struct sk_buff *skb)
struct net_device *dev;
bool deliver;
- __IP6_UPD_PO_STATS(dev_net(skb_dst(skb)->dev),
+ __IP6_UPD_PO_STATS(skb_dst_dev_net(skb),
__in6_dev_get_safely(skb->dev), IPSTATS_MIB_INMCAST,
skb->len);
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index fd25d5aadea27..5d64fde251eca 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -234,8 +234,9 @@ static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
- struct net_device *dev = skb_dst(skb)->dev, *indev = skb->dev;
- struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
+ struct dst_entry *dst = skb_dst(skb);
+ struct net_device *dev = dst_dev(dst), *indev = skb->dev;
+ struct inet6_dev *idev = ip6_dst_idev(dst);
skb->protocol = htons(ETH_P_IPV6);
skb->dev = dev;
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 4001acf569af1..2fe68e8c68d89 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -637,7 +637,7 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
} else {
if (ip_route_input(skb2, eiph->daddr, eiph->saddr,
ip4h_dscp(eiph), skb2->dev) ||
- skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
+ skb_dst_dev(skb2)->type != ARPHRD_TUNNEL6)
goto out;
}
diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index e8c60b7fb0120..3880662b6bc38 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -531,7 +531,7 @@ vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
xmit:
skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
skb_dst_set(skb, dst);
- skb->dev = skb_dst(skb)->dev;
+ skb->dev = dst_dev(dst);
err = dst_output(t->net, skb->sk, skb);
if (net_xmit_eval(err) == 0)
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index 2fd2c3e315ee8..a6635e3987920 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -24,7 +24,7 @@ int ip6_route_me_harder(struct net *net, struct sock *sk_partial, struct sk_buff
{
const struct ipv6hdr *iph = ipv6_hdr(skb);
struct sock *sk = sk_to_full_sk(sk_partial);
- struct net_device *dev = skb_dst(skb)->dev;
+ struct net_device *dev = skb_dst_dev(skb);
struct flow_keys flkeys;
unsigned int hh_len;
struct dst_entry *dst;
@@ -72,7 +72,7 @@ int ip6_route_me_harder(struct net *net, struct sock *sk_partial, struct sk_buff
#endif
/* Change in oif may mean change in hh_len. */
- hh_len = skb_dst(skb)->dev->hard_header_len;
+ hh_len = skb_dst_dev(skb)->hard_header_len;
if (skb_headroom(skb) < hh_len &&
pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)),
0, GFP_ATOMIC))
diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c
index 84afa0cbc9021..3c56e94e6943b 100644
--- a/net/ipv6/netfilter/nf_reject_ipv6.c
+++ b/net/ipv6/netfilter/nf_reject_ipv6.c
@@ -330,7 +330,7 @@ void nf_send_reset6(struct net *net, struct sock *sk, struct sk_buff *oldskb,
skb_dst_set(oldskb, dst);
}
- fl6.flowi6_oif = l3mdev_master_ifindex(skb_dst(oldskb)->dev);
+ fl6.flowi6_oif = l3mdev_master_ifindex(skb_dst_dev(oldskb));
fl6.flowi6_mark = IP6_REPLY_MARK(net, oldskb->mark);
security_skb_classify_flow(oldskb, flowi6_to_flowi_common(&fl6));
dst = ip6_route_output(net, NULL, &fl6);
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index 90a178dd24aae..d21fe27fe21e3 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -141,7 +141,7 @@ int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
skb->protocol = htons(ETH_P_IPV6);
return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
- net, sk, skb, NULL, skb_dst(skb)->dev,
+ net, sk, skb, NULL, skb_dst_dev(skb),
dst_output);
}
EXPORT_SYMBOL_GPL(__ip6_local_out);
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 49740898bc137..e8e58875fc726 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -104,11 +104,11 @@ fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif)
return container_of(q, struct frag_queue, q);
}
-static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
+static int ip6_frag_queue(struct net *net,
+ struct frag_queue *fq, struct sk_buff *skb,
struct frag_hdr *fhdr, int nhoff,
u32 *prob_offset, int *refs)
{
- struct net *net = dev_net(skb_dst(skb)->dev);
int offset, end, fragsize;
struct sk_buff *prev_tail;
struct net_device *dev;
@@ -324,10 +324,10 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,
static int ipv6_frag_rcv(struct sk_buff *skb)
{
+ const struct ipv6hdr *hdr = ipv6_hdr(skb);
+ struct net *net = skb_dst_dev_net(skb);
struct frag_hdr *fhdr;
struct frag_queue *fq;
- const struct ipv6hdr *hdr = ipv6_hdr(skb);
- struct net *net = dev_net(skb_dst(skb)->dev);
u8 nexthdr;
int iif;
@@ -384,7 +384,7 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
spin_lock(&fq->q.lock);
fq->iif = iif;
- ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff,
+ ret = ip6_frag_queue(net, fq, skb, fhdr, IP6CB(skb)->nhoff,
&prob_offset, &refs);
spin_unlock(&fq->q.lock);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 3e5bf8a5b32b2..38d646bf75021 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4597,7 +4597,7 @@ static int ip6_pkt_discard(struct sk_buff *skb)
static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
- skb->dev = skb_dst(skb)->dev;
+ skb->dev = skb_dst_dev(skb);
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
}
@@ -4608,7 +4608,7 @@ static int ip6_pkt_prohibit(struct sk_buff *skb)
static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
- skb->dev = skb_dst(skb)->dev;
+ skb->dev = skb_dst_dev(skb);
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
}
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index fb5a701f8d255..ead677bca4901 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -365,7 +365,7 @@ static int __seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
#ifdef CONFIG_IPV6_SEG6_HMAC
if (sr_has_hmac(isrh)) {
- struct net *net = dev_net(skb_dst(skb)->dev);
+ struct net *net = skb_dst_dev_net(skb);
err = seg6_push_hmac(net, &hdr->saddr, isrh);
if (unlikely(err))
@@ -540,7 +540,7 @@ static int seg6_input_core(struct net *net, struct sock *sk,
static int seg6_input_nf(struct sk_buff *skb)
{
- struct net_device *dev = skb_dst(skb)->dev;
+ struct net_device *dev = skb_dst_dev(skb);
struct net *net = dev_net(skb->dev);
switch (skb->protocol) {
@@ -626,7 +626,7 @@ static int seg6_output_core(struct net *net, struct sock *sk,
static int seg6_output_nf(struct net *net, struct sock *sk, struct sk_buff *skb)
{
- struct net_device *dev = skb_dst(skb)->dev;
+ struct net_device *dev = skb_dst_dev(skb);
switch (skb->protocol) {
case htons(ETH_P_IP):
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 085fc97c5a5b3..e3284c9acbf49 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -862,7 +862,7 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
int oif, int rst, u8 tclass, __be32 label,
u32 priority, u32 txhash, struct tcp_key *key)
{
- struct net *net = sk ? sock_net(sk) : dev_net_rcu(skb_dst(skb)->dev);
+ struct net *net = sk ? sock_net(sk) : skb_dst_dev_net_rcu(skb);
unsigned int tot_len = sizeof(struct tcphdr);
struct sock *ctl_sk = net->ipv6.tcp_sk;
const struct tcphdr *th = tcp_hdr(skb);
@@ -1036,7 +1036,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb,
if (!sk && !ipv6_unicast_destination(skb))
return;
- net = sk ? sock_net(sk) : dev_net_rcu(skb_dst(skb)->dev);
+ net = sk ? sock_net(sk) : skb_dst_dev_net_rcu(skb);
/* Invalid TCP option size or twice included auth */
if (tcp_parse_auth_options(th, &md5_hash_location, &aoh))
return;
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index b3d5d1f266eee..512bdaf136997 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -106,7 +106,7 @@ static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
- net, sk, skb, skb->dev, skb_dst(skb)->dev,
+ net, sk, skb, skb->dev, skb_dst_dev(skb),
__xfrm6_output,
!(IP6CB(skb)->flags & IP6SKB_REROUTED));
}
--
2.53.0
next prev parent reply other threads:[~2026-09-08 17:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-03 14:00 FAILED: patch "[PATCH] ip: orphan prefetched skbs before multicast forwarding" failed to apply to 6.12-stable tree gregkh
2026-09-08 17:25 ` Sasha Levin [this message]
2026-09-08 17:25 ` [PATCH 6.12.y 2/3] ipv6: ip6_mc_input() and ip6_mr_input() cleanups Sasha Levin
2026-09-08 17:25 ` [PATCH 6.12.y 3/3] ip: orphan prefetched skbs before multicast forwarding Sasha Levin
2026-09-08 17:25 ` [PATCH 6.12.y 1/3] ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers Sasha Levin
2026-09-08 17:25 ` [PATCH 6.12.y 2/3] ipv6: ip6_mc_input() and ip6_mr_input() cleanups Sasha Levin
2026-09-08 17:25 ` [PATCH 6.12.y 3/3] ip: orphan prefetched skbs before multicast forwarding Sasha Levin
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