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Wed, 25 Mar 2026 12:11:20 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id cKKqBujQw2kbNgAAD6G6ig (envelope-from ); Wed, 25 Mar 2026 12:11:20 +0000 From: Fernando Fernandez Mancera To: netdev@vger.kernel.org Cc: Fernando Fernandez Mancera , =?UTF-8?q?Ricardo=20B=2E=20Marli=C3=A8re?= , "David S. Miller" , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , linux-kernel@vger.kernel.org Subject: [PATCH 10/11 net-next v5] ipv6: remove ipv6_stub infrastructure completely Date: Wed, 25 Mar 2026 13:08:51 +0100 Message-ID: <20260325120928.15848-11-fmancera@suse.de> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260325120928.15848-1-fmancera@suse.de> References: <20260325120928.15848-1-fmancera@suse.de> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-7.30 / 50.00]; REPLY(-4.00)[]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RLrr9ek4ud4f4qwi71m7motjzt)]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_SEVEN(0.00)[10]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,imap1.dmz-prg2.suse.org:helo,suse.de:mid,suse.de:email] X-Spam-Flag: NO X-Spam-Score: -7.30 X-Spam-Level: As IPv6 is built-in only and there are no more users of ipv6_stub, the ipv6_stub is now entirely obsolete. Remove all the code related to the definition, initialization and usage. Signed-off-by: Fernando Fernandez Mancera Tested-by: Ricardo B. Marlière --- include/net/ip6_fib.h | 1 - include/net/ipv6_stubs.h | 80 ---------------------------------- include/net/ndisc.h | 25 +---------- include/net/udp_tunnel.h | 1 - net/ipv6/addrconf_core.c | 91 --------------------------------------- net/ipv6/af_inet6.c | 40 ----------------- net/ipv6/ip6_fib.c | 8 ---- net/ipv6/ip6_udp_tunnel.c | 3 +- 8 files changed, 3 insertions(+), 246 deletions(-) delete mode 100644 include/net/ipv6_stubs.h diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h index f01ef8ffe296..3e72cce4fe0f 100644 --- a/include/net/ip6_fib.h +++ b/include/net/ip6_fib.h @@ -602,7 +602,6 @@ static inline void fib6_update_sernum_upto_root(struct net *net, struct fib6_inf { } #endif -void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i); void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val); static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric) diff --git a/include/net/ipv6_stubs.h b/include/net/ipv6_stubs.h deleted file mode 100644 index dc708d9eca7a..000000000000 --- a/include/net/ipv6_stubs.h +++ /dev/null @@ -1,80 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _IPV6_STUBS_H -#define _IPV6_STUBS_H - -#include -#include -#include -#include -#include -#include -#include -#include - -/* structs from net/ip6_fib.h */ -struct fib6_info; -struct fib6_nh; -struct fib6_config; -struct fib6_result; - -/* This is ugly, ideally these symbols should be built - * into the core kernel. - */ -struct ipv6_stub { - int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex, - const struct in6_addr *addr); - int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex, - const struct in6_addr *addr); - struct dst_entry *(*ipv6_dst_lookup_flow)(struct net *net, - const struct sock *sk, - struct flowi6 *fl6, - const struct in6_addr *final_dst); - int (*ipv6_route_input)(struct sk_buff *skb); - - struct fib6_table *(*fib6_get_table)(struct net *net, u32 id); - int (*fib6_lookup)(struct net *net, int oif, struct flowi6 *fl6, - struct fib6_result *res, int flags); - int (*fib6_table_lookup)(struct net *net, struct fib6_table *table, - int oif, struct flowi6 *fl6, - struct fib6_result *res, int flags); - void (*fib6_select_path)(const struct net *net, struct fib6_result *res, - struct flowi6 *fl6, int oif, bool oif_match, - const struct sk_buff *skb, int strict); - u32 (*ip6_mtu_from_fib6)(const struct fib6_result *res, - const struct in6_addr *daddr, - const struct in6_addr *saddr); - - int (*fib6_nh_init)(struct net *net, struct fib6_nh *fib6_nh, - struct fib6_config *cfg, gfp_t gfp_flags, - struct netlink_ext_ack *extack); - void (*fib6_nh_release)(struct fib6_nh *fib6_nh); - void (*fib6_nh_release_dsts)(struct fib6_nh *fib6_nh); - void (*fib6_update_sernum)(struct net *net, struct fib6_info *rt); - int (*ip6_del_rt)(struct net *net, struct fib6_info *rt, bool skip_notify); - void (*fib6_rt_update)(struct net *net, struct fib6_info *rt, - struct nl_info *info); - - void (*udpv6_encap_enable)(void); - void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr, - const struct in6_addr *solicited_addr, - bool router, bool solicited, bool override, bool inc_opt); -#if IS_ENABLED(CONFIG_XFRM) - void (*xfrm6_local_rxpmtu)(struct sk_buff *skb, u32 mtu); - int (*xfrm6_udp_encap_rcv)(struct sock *sk, struct sk_buff *skb); - struct sk_buff *(*xfrm6_gro_udp_encap_rcv)(struct sock *sk, - struct list_head *head, - struct sk_buff *skb); - int (*xfrm6_rcv_encap)(struct sk_buff *skb, int nexthdr, __be32 spi, - int encap_type); -#endif - struct neigh_table *nd_tbl; - - int (*ipv6_fragment)(struct net *net, struct sock *sk, struct sk_buff *skb, - int (*output)(struct net *, struct sock *, struct sk_buff *)); - struct net_device *(*ipv6_dev_find)(struct net *net, const struct in6_addr *addr, - struct net_device *dev); - int (*ip6_xmit)(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, - __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); -}; -extern const struct ipv6_stub *ipv6_stub __read_mostly; -#endif diff --git a/include/net/ndisc.h b/include/net/ndisc.h index 19e2a177bd29..3da1a6f8d3f9 100644 --- a/include/net/ndisc.h +++ b/include/net/ndisc.h @@ -2,8 +2,6 @@ #ifndef _NDISC_H #define _NDISC_H -#include - /* * ICMP codes for neighbour discovery messages */ @@ -359,14 +357,6 @@ static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev); } -static inline -struct neighbour *__ipv6_neigh_lookup_noref_stub(struct net_device *dev, - const void *pkey) -{ - return ___neigh_lookup_noref(ipv6_stub->nd_tbl, neigh_key_eq128, - ndisc_hashfn, pkey, dev); -} - static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey) { struct neighbour *n; @@ -391,25 +381,13 @@ static inline void __ipv6_confirm_neigh(struct net_device *dev, rcu_read_unlock(); } -static inline void __ipv6_confirm_neigh_stub(struct net_device *dev, - const void *pkey) -{ - struct neighbour *n; - - rcu_read_lock(); - n = __ipv6_neigh_lookup_noref_stub(dev, pkey); - neigh_confirm(n); - rcu_read_unlock(); -} - -/* uses ipv6_stub and is meant for use outside of IPv6 core */ static inline struct neighbour *ip_neigh_gw6(struct net_device *dev, const void *addr) { #if IS_ENABLED(CONFIG_IPV6) struct neighbour *neigh; - neigh = __ipv6_neigh_lookup_noref_stub(dev, addr); + neigh = __ipv6_neigh_lookup_noref(dev, addr); if (unlikely(!neigh)) neigh = __neigh_create(&nd_tbl, addr, dev, false); @@ -438,6 +416,7 @@ void ndisc_send_skb(struct sk_buff *skb, const struct in6_addr *daddr, void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, const struct in6_addr *daddr); + void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, const struct in6_addr *solicited_addr, bool router, bool solicited, bool override, bool inc_opt); diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h index 40089fc4c1ba..47c23d4a1740 100644 --- a/include/net/udp_tunnel.h +++ b/include/net/udp_tunnel.h @@ -7,7 +7,6 @@ #if IS_ENABLED(CONFIG_IPV6) #include -#include #endif #define UDP_TUNNEL_PARTIAL_FEATURES NETIF_F_GSO_ENCAP_ALL diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c index c008d21925d7..fa27a90ab3cd 100644 --- a/net/ipv6/addrconf_core.c +++ b/net/ipv6/addrconf_core.c @@ -6,7 +6,6 @@ #include #include -#include #include #include @@ -129,96 +128,6 @@ int inet6addr_validator_notifier_call_chain(unsigned long val, void *v) } EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain); -static struct dst_entry *eafnosupport_ipv6_dst_lookup_flow(struct net *net, - const struct sock *sk, - struct flowi6 *fl6, - const struct in6_addr *final_dst) -{ - return ERR_PTR(-EAFNOSUPPORT); -} - -static int eafnosupport_ipv6_route_input(struct sk_buff *skb) -{ - return -EAFNOSUPPORT; -} - -static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id) -{ - return NULL; -} - -static int -eafnosupport_fib6_table_lookup(struct net *net, struct fib6_table *table, - int oif, struct flowi6 *fl6, - struct fib6_result *res, int flags) -{ - return -EAFNOSUPPORT; -} - -static int -eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6, - struct fib6_result *res, int flags) -{ - return -EAFNOSUPPORT; -} - -static void -eafnosupport_fib6_select_path(const struct net *net, struct fib6_result *res, - struct flowi6 *fl6, int oif, bool have_oif_match, - const struct sk_buff *skb, int strict) -{ -} - -static u32 -eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res, - const struct in6_addr *daddr, - const struct in6_addr *saddr) -{ - return 0; -} - -static int eafnosupport_fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, - struct fib6_config *cfg, gfp_t gfp_flags, - struct netlink_ext_ack *extack) -{ - NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel"); - return -EAFNOSUPPORT; -} - -static int eafnosupport_ip6_del_rt(struct net *net, struct fib6_info *rt, - bool skip_notify) -{ - return -EAFNOSUPPORT; -} - -static int eafnosupport_ipv6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, - int (*output)(struct net *, struct sock *, struct sk_buff *)) -{ - kfree_skb(skb); - return -EAFNOSUPPORT; -} - -static struct net_device *eafnosupport_ipv6_dev_find(struct net *net, const struct in6_addr *addr, - struct net_device *dev) -{ - return ERR_PTR(-EAFNOSUPPORT); -} - -const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) { - .ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow, - .ipv6_route_input = eafnosupport_ipv6_route_input, - .fib6_get_table = eafnosupport_fib6_get_table, - .fib6_table_lookup = eafnosupport_fib6_table_lookup, - .fib6_lookup = eafnosupport_fib6_lookup, - .fib6_select_path = eafnosupport_fib6_select_path, - .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6, - .fib6_nh_init = eafnosupport_fib6_nh_init, - .ip6_del_rt = eafnosupport_ip6_del_rt, - .ipv6_fragment = eafnosupport_ipv6_fragment, - .ipv6_dev_find = eafnosupport_ipv6_dev_find, -}; -EXPORT_SYMBOL_GPL(ipv6_stub); - /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ const struct in6_addr in6addr_loopback __aligned(BITS_PER_LONG/8) = IN6ADDR_LOOPBACK_INIT; diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index 07ae6ea7743a..33abd8d8cd7d 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -51,7 +51,6 @@ #include #include #include -#include #include #ifdef CONFIG_IPV6_TUNNEL #include @@ -996,42 +995,6 @@ static struct pernet_operations inet6_net_ops = { .exit = inet6_net_exit, }; -static int ipv6_route_input(struct sk_buff *skb) -{ - ip6_route_input(skb); - return skb_dst(skb)->error; -} - -static const struct ipv6_stub ipv6_stub_impl = { - .ipv6_sock_mc_join = ipv6_sock_mc_join, - .ipv6_sock_mc_drop = ipv6_sock_mc_drop, - .ipv6_dst_lookup_flow = ip6_dst_lookup_flow, - .ipv6_route_input = ipv6_route_input, - .fib6_get_table = fib6_get_table, - .fib6_table_lookup = fib6_table_lookup, - .fib6_lookup = fib6_lookup, - .fib6_select_path = fib6_select_path, - .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, - .fib6_nh_init = fib6_nh_init, - .fib6_nh_release = fib6_nh_release, - .fib6_nh_release_dsts = fib6_nh_release_dsts, - .fib6_update_sernum = fib6_update_sernum_stub, - .fib6_rt_update = fib6_rt_update, - .ip6_del_rt = ip6_del_rt, - .udpv6_encap_enable = udpv6_encap_enable, - .ndisc_send_na = ndisc_send_na, -#if IS_ENABLED(CONFIG_XFRM) - .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu, - .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv, - .xfrm6_gro_udp_encap_rcv = xfrm6_gro_udp_encap_rcv, - .xfrm6_rcv_encap = xfrm6_rcv_encap, -#endif - .nd_tbl = &nd_tbl, - .ipv6_fragment = ip6_fragment, - .ipv6_dev_find = ipv6_dev_find, - .ip6_xmit = ip6_xmit, -}; - static int __init inet6_init(void) { struct list_head *r; @@ -1188,9 +1151,6 @@ static int __init inet6_init(void) goto sysctl_fail; #endif - /* ensure that ipv6 stubs are visible only after ipv6 is ready */ - wmb(); - ipv6_stub = &ipv6_stub_impl; out: return err; diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index a935004ec9df..3d52044e0bdb 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -1408,14 +1408,6 @@ void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt) __fib6_update_sernum_upto_root(rt, fib6_new_sernum(net)); } -/* allow ipv4 to update sernum via ipv6_stub */ -void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i) -{ - spin_lock_bh(&f6i->fib6_table->tb6_lock); - fib6_update_sernum_upto_root(net, f6i); - spin_unlock_bh(&f6i->fib6_table->tb6_lock); -} - /* * Add routing information to the routing tree. * / diff --git a/net/ipv6/ip6_udp_tunnel.c b/net/ipv6/ip6_udp_tunnel.c index cef3e0210744..405ef1cb8864 100644 --- a/net/ipv6/ip6_udp_tunnel.c +++ b/net/ipv6/ip6_udp_tunnel.c @@ -162,8 +162,7 @@ struct dst_entry *udp_tunnel6_dst_lookup(struct sk_buff *skb, fl6.fl6_dport = dport; fl6.flowlabel = ip6_make_flowinfo(dsfield, key->label); - dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6, - NULL); + dst = ip6_dst_lookup_flow(net, sock->sk, &fl6, NULL); if (IS_ERR(dst)) { netdev_dbg(dev, "no route to %pI6\n", &fl6.daddr); return ERR_PTR(-ENETUNREACH); -- 2.53.0