net: gro: convert four dev_net() calls

tcp4_check_fraglist_gro(), tcp6_check_fraglist_gro(),
udp4_gro_lookup_skb() and udp6_gro_lookup_skb()
assume RCU is held so that the net structure does not disappear.

Use dev_net_rcu() instead of dev_net() to get LOCKDEP support.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250301201424.2046477-5-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index 2308665..ecef16c 100644 (file)
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -425,7 +425,7 @@ static void tcp4_check_fraglist_gro(struct list_head *head, struct sk_buff *skb,
 
        inet_get_iif_sdif(skb, &iif, &sdif);
        iph = skb_gro_network_header(skb);
-       net = dev_net(skb->dev);
+       net = dev_net_rcu(skb->dev);
        sk = __inet_lookup_established(net, net->ipv4.tcp_death_row.hashinfo,
                                       iph->saddr, th->source,
                                       iph->daddr, ntohs(th->dest),

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index a5be6e4..c1a85b3 100644 (file)
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -630,7 +630,7 @@ static struct sock *udp4_gro_lookup_skb(struct sk_buff *skb, __be16 sport,
                                        __be16 dport)
 {
        const struct iphdr *iph = skb_gro_network_header(skb);
-       struct net *net = dev_net(skb->dev);
+       struct net *net = dev_net_rcu(skb->dev);
        int iif, sdif;
 
        inet_get_iif_sdif(skb, &iif, &sdif);

diff --git a/net/ipv6/tcpv6_offload.c b/net/ipv6/tcpv6_offload.c
index a45bf17..91b88da 100644 (file)
--- a/net/ipv6/tcpv6_offload.c
+++ b/net/ipv6/tcpv6_offload.c
@@ -35,7 +35,7 @@ static void tcp6_check_fraglist_gro(struct list_head *head, struct sk_buff *skb,
 
        inet6_get_iif_sdif(skb, &iif, &sdif);
        hdr = skb_gro_network_header(skb);
-       net = dev_net(skb->dev);
+       net = dev_net_rcu(skb->dev);
        sk = __inet6_lookup_established(net, net->ipv4.tcp_death_row.hashinfo,
                                        &hdr->saddr, th->source,
                                        &hdr->daddr, ntohs(th->dest),

diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index b41152d..404212d 100644 (file)
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -117,7 +117,7 @@ static struct sock *udp6_gro_lookup_skb(struct sk_buff *skb, __be16 sport,
                                        __be16 dport)
 {
        const struct ipv6hdr *iph = skb_gro_network_header(skb);
-       struct net *net = dev_net(skb->dev);
+       struct net *net = dev_net_rcu(skb->dev);
        int iif, sdif;
 
        inet6_get_iif_sdif(skb, &iif, &sdif);