From: Eric Dumazet Date: Tue, 16 Sep 2025 16:09:43 +0000 (+0000) Subject: ipv6: make ipv6_pinfo.daddr_cache a boolean X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5489f333ef993bfceebce9ae98944f04eaafcc30;p=users%2Fhch%2Fmisc.git ipv6: make ipv6_pinfo.daddr_cache a boolean ipv6_pinfo.daddr_cache is either NULL or &sk->sk_v6_daddr We do not need 8 bytes, a boolean is enough. Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Reviewed-by: David Ahern Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250916160951.541279-3-edumazet@google.com Reviewed-by: Jakub Kicinski Signed-off-by: Paolo Abeni --- diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index 55c4d1e4dd7d..8e6d9f8b3dc8 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -219,7 +219,7 @@ struct ipv6_pinfo { #ifdef CONFIG_IPV6_SUBTREES bool saddr_cache; #endif - const struct in6_addr *daddr_cache; + bool daddr_cache; __be32 flow_label; __u32 frag_size; diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index 223c02d42688..7c5512baa4b2 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -229,14 +229,14 @@ static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb) * Store a destination cache entry in a socket */ static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, - const struct in6_addr *daddr, + bool daddr_set, bool saddr_set) { struct ipv6_pinfo *np = inet6_sk(sk); np->dst_cookie = rt6_get_cookie(dst_rt6_info(dst)); sk_setup_caps(sk, dst); - np->daddr_cache = daddr; + np->daddr_cache = daddr_set; #ifdef CONFIG_IPV6_SUBTREES np->saddr_cache = saddr_set; #endif diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index c342f8daea7f..1b0314644e0c 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -857,7 +857,7 @@ int inet6_sk_rebuild_header(struct sock *sk) return PTR_ERR(dst); } - ip6_dst_store(sk, dst, NULL, false); + ip6_dst_store(sk, dst, false, false); } return 0; diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c index 1947ccdb00df..ea5cf3fdfdd6 100644 --- a/net/ipv6/inet6_connection_sock.c +++ b/net/ipv6/inet6_connection_sock.c @@ -91,7 +91,7 @@ static struct dst_entry *inet6_csk_route_socket(struct sock *sk, dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p); if (!IS_ERR(dst)) - ip6_dst_store(sk, dst, NULL, false); + ip6_dst_store(sk, dst, false, false); } return dst; } diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 82ff6e1293d0..f904739e99b9 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1100,7 +1100,8 @@ static struct dst_entry *ip6_sk_dst_check(struct sock *sk, * sockets. * 2. oif also should be the same. */ - if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || + if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, + np->daddr_cache ? &sk->sk_v6_daddr : NULL) || #ifdef CONFIG_IPV6_SUBTREES ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache ? &np->saddr : NULL) || diff --git a/net/ipv6/route.c b/net/ipv6/route.c index e1b0aebf8bf9..aee6a10b112a 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -3032,8 +3032,7 @@ void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, #endif ip6_dst_store(sk, dst, - ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ? - &sk->sk_v6_daddr : NULL, + ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr), #ifdef CONFIG_IPV6_SUBTREES ipv6_addr_equal(&fl6->saddr, &np->saddr) ? true : diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index ecc3a87cd8c4..c7271f6359db 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -299,7 +299,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, inet->inet_rcv_saddr = LOOPBACK4_IPV6; sk->sk_gso_type = SKB_GSO_TCPV6; - ip6_dst_store(sk, dst, NULL, false); + ip6_dst_store(sk, dst, false, false); icsk->icsk_ext_hdr_len = 0; if (opt) @@ -1459,7 +1459,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff * memcpy(newnp, np, sizeof(struct ipv6_pinfo)); - ip6_dst_store(newsk, dst, NULL, false); + ip6_dst_store(newsk, dst, false, false); newnp->saddr = ireq->ir_v6_loc_addr;