From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5461E3B0586 for ; Thu, 17 Sep 2026 03:59:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789617569; cv=none; b=ImikxbaBHSKSKjBVjt3KlAtl+4KLslsOG9AU9buOLPYEladjkp0DlhrJxZGyf41Nv7SZKrD4GFaIoJ1x14pcTuYtSv2iN/usa5D4RvJUuQTMRnOcVnen6xtKQFV9Zd6hSh721tAR4eLu0WajlJAsE08j0vy7okoPXGiLNYmvIt4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789617569; c=relaxed/simple; bh=aXZ3FlkSSkIQBE4u5jpzXMAtkXozeXiIZyOGBs7lhhs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KlSDLHFV9JAXcJu6N9eGLuztTp0fSA38FcZ3J6yhEhqjYM4RVhlW7/Y/db5Bu0Nl9VmclKtgk3p1Uobiynzu5SbAtl22nXByPUmFG2ByLCh6zVFiM2owAiXHU+MXz8xyrPq/Xqx6NDL4YD3p8zYjRR9ZG4l0u1lNrpaYWydZmHs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Mqp1cN1I; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Mqp1cN1I" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A4461F00893; Thu, 17 Sep 2026 03:59:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789617565; bh=u4ub7B7pS2giKLNpu7633q3pq8BLOfMv8jQRgM8iSXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Mqp1cN1IenENgPaA7nkz83R1Bfe7T2aqTq5P7F4BEQZRrpUFTCIkOk6Z6N97OUBva eya9Nnb/uzAdmi2TIutpI0EaBcUVsJEhQ/2SCq6ksDJvGQWikD5wsTMEUeIIhLSeKs 9Bp5s+s3TkDy0SBJk29JPi6UxXcVKF8t9WATELXhK439WOZujXu27f4ts65m6T67YD Nh8RcctvAeHC/0YCngcmjegzB7aV/1QQ6aImOy7BCmDH9UueKBaGxt1TwSSBmXrVV2 7IT7d8x0eV5fwn6UjHRW6sv4xA8LbLsheTw1NgFKkqNL2lpbSkaaekjkz8qy6gbdwM GaXJ46x3gCtwg== From: Sasha Levin To: stable@vger.kernel.org Cc: Kuniyuki Iwashima , Eric Dumazet , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.1.y 4/5] ipv6: Move ipv6_fl_list from ipv6_pinfo to inet_sock. Date: Wed, 16 Sep 2026 23:59:19 -0400 Message-ID: <20260917035920.4132418-4-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260917035920.4132418-1-sashal@kernel.org> References: <2026091656-disparate-pang-cc22@gregkh> <20260917035920.4132418-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kuniyuki Iwashima [ Upstream commit 1c17f4373d4db1e1f0ebd3ddcd8e7a642927a826 ] In {tcp6,udp6,raw6}_sock, struct ipv6_pinfo is always placed at the beginning of a new cache line because 1. __alignof__(struct tcp_sock) is 64 due to ____cacheline_aligned of __cacheline_group_begin(tcp_sock_write_tx) 2. __alignof__(struct udp_sock) is 64 due to ____cacheline_aligned of struct numa_drop_counters 3. in raw6_sock, struct numa_drop_counters is placed before struct ipv6_pinfo . struct ipv6_pinfo is 136 bytes, but the last cache line is only used by ipv6_fl_list: $ pahole -C ipv6_pinfo vmlinux struct ipv6_pinfo { ... /* --- cacheline 2 boundary (128 bytes) --- */ struct ipv6_fl_socklist * ipv6_fl_list; /* 128 8 */ /* size: 136, cachelines: 3, members: 23 */ Let's move ipv6_fl_list from struct ipv6_pinfo to struct inet_sock to save a full cache line for {tcp6,udp6,raw6}_sock. Now, struct ipv6_pinfo is 128 bytes, and {tcp6,udp6,raw6}_sock have 64 bytes less, while {tcp,udp,raw}_sock retain the same size. Before: # grep -E "^(RAW|UDP[^L\-]|TCP)" /proc/slabinfo | awk '{print $1, "\t", $4}' RAWv6 1408 UDPv6 1472 TCPv6 2560 RAW 1152 UDP 1280 TCP 2368 After: # grep -E "^(RAW|UDP[^L\-]|TCP)" /proc/slabinfo | awk '{print $1, "\t", $4}' RAWv6 1344 UDPv6 1408 TCPv6 2496 RAW 1152 UDP 1280 TCP 2368 Also, ipv6_fl_list and inet_flags (SNDFLOW bit) are placed in the same cache line. $ pahole -C inet_sock vmlinux ... /* --- cacheline 11 boundary (704 bytes) was 56 bytes ago --- */ struct ipv6_pinfo * pinet6; /* 760 8 */ /* --- cacheline 12 boundary (768 bytes) --- */ struct ipv6_fl_socklist * ipv6_fl_list; /* 768 8 */ unsigned long inet_flags; /* 776 8 */ Doc churn is due to the insufficient Type column (only 1 space short). Suggested-by: Eric Dumazet Signed-off-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20251014224210.2964778-1-kuniyu@google.com Signed-off-by: Jakub Kicinski Backport notes for Linux 6.1: - Keep this dependency to provide the socket-based flowlabel iterator used by 8d6cd1885085 ("ipv6: flowlabel: cap duplicate leases per socket"). - Omit the cacheline documentation, which does not exist in this tree. Preserve the stable ipv6_pinfo layout apart from moving ipv6_fl_list; the upstream size/cacheline measurements above are not asserted here. - Clear the relocated list in the existing tcp_v6_mapped_child_init() callback and in both DCCP child paths. DCCP still exists in 6.1 but had already been removed when the upstream dependency was written. - Retain ipv6_flowlabel_get()'s ipv6_pinfo pointer for the stable repflow bit. This tree has not moved that bit to inet_sock atomic flags. - Use ordinary RCU for the socket-list iterator and its readers, as the target's new reader uses rcu_read_lock(). Keep the hash-table BH locking and all writer locking unchanged. - Name the existing global unprivileged limit in mem_check() to match the target's patch context. The admission test is algebraically equivalent; retain the 4096-entry table and existing atomic accounting. No functions are added by this dependency. [ sashal: Reduced backport -- upstream 1c17f4373d4db touches 7 file(s), this backport carries 7. Not backported here: Documentation/networking/net_cachelines/inet_sock.rst This note is generated from the file lists only; see the resolution record for the reasoning. ] Stable-dep-of: 8d6cd1885085 ("ipv6: flowlabel: cap duplicate leases per socket") Signed-off-by: Sasha Levin --- .../chelsio/inline_crypto/chtls/chtls_cm.c | 4 +- include/linux/ipv6.h | 1 - include/net/inet_sock.h | 1 + net/dccp/ipv6.c | 4 +- net/ipv6/ip6_flowlabel.c | 77 ++++++++++--------- net/ipv6/tcp_ipv6.c | 10 +-- net/sctp/ipv6.c | 8 +- 7 files changed, 54 insertions(+), 51 deletions(-) diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c index 6f6525983130e..6d69c19ea7c30 100644 --- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c +++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c @@ -1197,12 +1197,12 @@ static struct sock *chtls_recv_sock(struct sock *lsk, struct ipv6_pinfo *newnp = inet6_sk(newsk); struct ipv6_pinfo *np = inet6_sk(lsk); - inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; + newinet->pinet6 = &newtcp6sk->inet6; + newinet->ipv6_fl_list = NULL; memcpy(newnp, np, sizeof(struct ipv6_pinfo)); newsk->sk_v6_daddr = treq->ir_v6_rmt_addr; newsk->sk_v6_rcv_saddr = treq->ir_v6_loc_addr; inet6_sk(newsk)->saddr = treq->ir_v6_loc_addr; - newnp->ipv6_fl_list = NULL; newnp->pktoptions = NULL; newsk->sk_bound_dev_if = treq->ir_iif; newinet->inet_opt = NULL; diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index e464d34621306..d17fe43c08043 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -292,7 +292,6 @@ struct ipv6_pinfo { struct ipv6_mc_socklist __rcu *ipv6_mc_list; struct ipv6_ac_socklist *ipv6_ac_list; - struct ipv6_fl_socklist __rcu *ipv6_fl_list; struct ipv6_txoptions __rcu *opt; struct sk_buff *pktoptions; diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h index c98890e21401c..bb994809f0dba 100644 --- a/include/net/inet_sock.h +++ b/include/net/inet_sock.h @@ -211,6 +211,7 @@ struct inet_sock { struct sock sk; #if IS_ENABLED(CONFIG_IPV6) struct ipv6_pinfo *pinet6; + struct ipv6_fl_socklist __rcu *ipv6_fl_list; #endif /* Socket demultiplex comparisons on incoming packets. */ #define inet_daddr sk.__sk_common.skc_daddr diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c index aa74fe3beafe5..8cdf4fe9c166e 100644 --- a/net/dccp/ipv6.c +++ b/net/dccp/ipv6.c @@ -441,6 +441,7 @@ static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, newdp6 = (struct dccp6_sock *)newsk; newinet = inet_sk(newsk); newinet->pinet6 = &newdp6->inet6; + newinet->ipv6_fl_list = NULL; newnp = inet6_sk(newsk); memcpy(newnp, np, sizeof(struct ipv6_pinfo)); @@ -453,7 +454,6 @@ static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, newnp->opt = NULL; newnp->ipv6_mc_list = NULL; newnp->ipv6_ac_list = NULL; - newnp->ipv6_fl_list = NULL; newnp->mcast_oif = inet_iif(skb); newnp->mcast_hops = ip_hdr(skb)->ttl; @@ -500,6 +500,7 @@ static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, newdp6 = (struct dccp6_sock *)newsk; newinet = inet_sk(newsk); newinet->pinet6 = &newdp6->inet6; + newinet->ipv6_fl_list = NULL; newnp = inet6_sk(newsk); memcpy(newnp, np, sizeof(struct ipv6_pinfo)); @@ -520,7 +521,6 @@ static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, newnp->ipv6_mc_list = NULL; newnp->ipv6_ac_list = NULL; - newnp->ipv6_fl_list = NULL; newnp->pktoptions = NULL; newnp->opt = NULL; newnp->mcast_oif = inet6_iif(skb); diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c index eb0d517aa6cb3..71d8e1bffd9ef 100644 --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -66,10 +66,10 @@ EXPORT_SYMBOL(ipv6_flowlabel_exclusive); fl != NULL; \ fl = rcu_dereference_bh(fl->next)) -#define for_each_sk_fl_rcu(np, sfl) \ - for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \ +#define for_each_sk_fl_rcu(sk, sfl) \ + for (sfl = rcu_dereference(inet_sk(sk)->ipv6_fl_list); \ sfl != NULL; \ - sfl = rcu_dereference_bh(sfl->next)) + sfl = rcu_dereference(sfl->next)) static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label) { @@ -254,37 +254,36 @@ static struct ip6_flowlabel *fl_intern(struct net *net, struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label) { struct ipv6_fl_socklist *sfl; - struct ipv6_pinfo *np = inet6_sk(sk); label &= IPV6_FLOWLABEL_MASK; - rcu_read_lock_bh(); - for_each_sk_fl_rcu(np, sfl) { + rcu_read_lock(); + for_each_sk_fl_rcu(sk, sfl) { struct ip6_flowlabel *fl = sfl->fl; if (fl->label == label && atomic_inc_not_zero(&fl->users)) { fl->lastuse = jiffies; - rcu_read_unlock_bh(); + rcu_read_unlock(); return fl; } } - rcu_read_unlock_bh(); + rcu_read_unlock(); return NULL; } EXPORT_SYMBOL_GPL(__fl6_sock_lookup); void fl6_free_socklist(struct sock *sk) { - struct ipv6_pinfo *np = inet6_sk(sk); + struct inet_sock *inet = inet_sk(sk); struct ipv6_fl_socklist *sfl; - if (!rcu_access_pointer(np->ipv6_fl_list)) + if (!rcu_access_pointer(inet->ipv6_fl_list)) return; spin_lock_bh(&ip6_sk_fl_lock); - while ((sfl = rcu_dereference_protected(np->ipv6_fl_list, + while ((sfl = rcu_dereference_protected(inet->ipv6_fl_list, lockdep_is_held(&ip6_sk_fl_lock))) != NULL) { - np->ipv6_fl_list = sfl->next; + inet->ipv6_fl_list = sfl->next; spin_unlock_bh(&ip6_sk_fl_lock); fl_release(sfl->fl); @@ -462,35 +461,38 @@ fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq, static int mem_check(struct sock *sk) { - struct ipv6_pinfo *np = inet6_sk(sk); - struct ipv6_fl_socklist *sfl; + const int unpriv_total_limit = FL_MAX_SIZE - (FL_MAX_SIZE / 4); int room = FL_MAX_SIZE - atomic_read(&fl_size); + struct ipv6_fl_socklist *sfl; int count = 0; if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) return 0; - rcu_read_lock_bh(); - for_each_sk_fl_rcu(np, sfl) + rcu_read_lock(); + for_each_sk_fl_rcu(sk, sfl) count++; - rcu_read_unlock_bh(); + rcu_read_unlock(); if (room <= 0 || ((count >= FL_MAX_PER_SOCK || - (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && + (count > 0 && room < FL_MAX_SIZE / 2) || + FL_MAX_SIZE - room > unpriv_total_limit) && !capable(CAP_NET_ADMIN))) return -ENOBUFS; return 0; } -static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, - struct ip6_flowlabel *fl) +static inline void fl_link(struct sock *sk, struct ipv6_fl_socklist *sfl, + struct ip6_flowlabel *fl) { + struct inet_sock *inet = inet_sk(sk); + spin_lock_bh(&ip6_sk_fl_lock); sfl->fl = fl; - sfl->next = np->ipv6_fl_list; - rcu_assign_pointer(np->ipv6_fl_list, sfl); + sfl->next = inet->ipv6_fl_list; + rcu_assign_pointer(inet->ipv6_fl_list, sfl); spin_unlock_bh(&ip6_sk_fl_lock); } @@ -510,9 +512,9 @@ int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, return 0; } - rcu_read_lock_bh(); + rcu_read_lock(); - for_each_sk_fl_rcu(np, sfl) { + for_each_sk_fl_rcu(sk, sfl) { if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) { spin_lock_bh(&ip6_fl_lock); freq->flr_label = sfl->fl->label; @@ -522,11 +524,11 @@ int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, freq->flr_linger = sfl->fl->linger / HZ; spin_unlock_bh(&ip6_fl_lock); - rcu_read_unlock_bh(); + rcu_read_unlock(); return 0; } } - rcu_read_unlock_bh(); + rcu_read_unlock(); return -ENOENT; } @@ -551,7 +553,7 @@ static int ipv6_flowlabel_put(struct sock *sk, struct in6_flowlabel_req *freq) } spin_lock_bh(&ip6_sk_fl_lock); - for (sflp = &np->ipv6_fl_list; + for (sflp = &inet_sk(sk)->ipv6_fl_list; (sfl = socklist_dereference(*sflp)) != NULL; sflp = &sfl->next) { if (sfl->fl->label == freq->flr_label) @@ -571,21 +573,20 @@ static int ipv6_flowlabel_put(struct sock *sk, struct in6_flowlabel_req *freq) static int ipv6_flowlabel_renew(struct sock *sk, struct in6_flowlabel_req *freq) { - struct ipv6_pinfo *np = inet6_sk(sk); struct net *net = sock_net(sk); struct ipv6_fl_socklist *sfl; int err; - rcu_read_lock_bh(); - for_each_sk_fl_rcu(np, sfl) { + rcu_read_lock(); + for_each_sk_fl_rcu(sk, sfl) { if (sfl->fl->label == freq->flr_label) { err = fl6_renew(sfl->fl, freq->flr_linger, freq->flr_expires); - rcu_read_unlock_bh(); + rcu_read_unlock(); return err; } } - rcu_read_unlock_bh(); + rcu_read_unlock(); if (freq->flr_share == IPV6_FL_S_NONE && ns_capable(net->user_ns, CAP_NET_ADMIN)) { @@ -636,11 +637,11 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq, if (freq->flr_label) { err = -EEXIST; - rcu_read_lock_bh(); - for_each_sk_fl_rcu(np, sfl) { + rcu_read_lock(); + for_each_sk_fl_rcu(sk, sfl) { if (sfl->fl->label == freq->flr_label) { if (freq->flr_flags & IPV6_FL_F_EXCL) { - rcu_read_unlock_bh(); + rcu_read_unlock(); goto done; } fl1 = sfl->fl; @@ -649,7 +650,7 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq, break; } } - rcu_read_unlock_bh(); + rcu_read_unlock(); if (!fl1) fl1 = fl_lookup(net, freq->flr_label); @@ -674,7 +675,7 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq, fl1->linger = fl->linger; if ((long)(fl->expires - fl1->expires) > 0) fl1->expires = fl->expires; - fl_link(np, sfl1, fl1); + fl_link(sk, sfl1, fl1); fl_free(fl); return 0; @@ -708,7 +709,7 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq, } } - fl_link(np, sfl1, fl); + fl_link(sk, sfl1, fl); return 0; done: fl_free(fl); diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index f2df8845a403e..91087e90da14e 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1198,6 +1198,7 @@ static void tcp_v6_mapped_child_init(struct sock *newsk, const struct sock *sk) struct ipv6_pinfo *newnp; newinet->pinet6 = newnp = tcp_inet6_sk(newsk); + newinet->ipv6_fl_list = NULL; memcpy(newnp, tcp_inet6_sk(sk), sizeof(struct ipv6_pinfo)); @@ -1213,7 +1214,6 @@ static void tcp_v6_mapped_child_init(struct sock *newsk, const struct sock *sk) newnp->ipv6_mc_list = NULL; newnp->ipv6_ac_list = NULL; - newnp->ipv6_fl_list = NULL; newnp->pktoptions = NULL; newnp->opt = NULL; @@ -1276,10 +1276,12 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff * newsk->sk_gso_type = SKB_GSO_TCPV6; inet6_sk_rx_dst_set(newsk, skb); - inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk); + newinet = inet_sk(newsk); + newinet->pinet6 = tcp_inet6_sk(newsk); + newinet->ipv6_fl_list = NULL; + newinet->inet_opt = NULL; newtp = tcp_sk(newsk); - newinet = inet_sk(newsk); newnp = tcp_inet6_sk(newsk); memcpy(newnp, np, sizeof(struct ipv6_pinfo)); @@ -1295,10 +1297,8 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff * First: no IPv4 options. */ - newinet->inet_opt = NULL; newnp->ipv6_mc_list = NULL; newnp->ipv6_ac_list = NULL; - newnp->ipv6_fl_list = NULL; /* Clone RX bits */ newnp->rxopt.all = np->rxopt.all; diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index be190f5696d88..07ee828bb1f80 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -767,9 +767,10 @@ static struct sock *sctp_v6_create_accept_sk(struct sock *sk, struct sctp_association *asoc, bool kern) { - struct sock *newsk; struct ipv6_pinfo *newnp, *np = inet6_sk(sk); struct sctp6_sock *newsctp6sk; + struct inet_sock *newinet; + struct sock *newsk; newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern); if (!newsk) @@ -781,7 +782,9 @@ static struct sock *sctp_v6_create_accept_sk(struct sock *sk, sock_reset_flag(sk, SOCK_ZAPPED); newsctp6sk = (struct sctp6_sock *)newsk; - inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; + newinet = inet_sk(newsk); + newinet->pinet6 = &newsctp6sk->inet6; + newinet->ipv6_fl_list = NULL; sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; @@ -790,7 +793,6 @@ static struct sock *sctp_v6_create_accept_sk(struct sock *sk, memcpy(newnp, np, sizeof(struct ipv6_pinfo)); newnp->ipv6_mc_list = NULL; newnp->ipv6_ac_list = NULL; - newnp->ipv6_fl_list = NULL; sctp_v6_copy_ip_options(sk, newsk); -- 2.53.0