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Thu, 17 Jul 2025 04:55:11 -0700 (PDT) From: Richard Gobert To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, dsahern@kernel.org, razor@blackwall.org, idosch@nvidia.com, petrm@nvidia.com, menglong8.dong@gmail.com, richardbgobert@gmail.com, daniel@iogearbox.net, martin.lau@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v4 4/4] net: geneve: enable binding geneve sockets to local addresses Date: Thu, 17 Jul 2025 13:54:12 +0200 Message-Id: <20250717115412.11424-5-richardbgobert@gmail.com> In-Reply-To: <20250717115412.11424-1-richardbgobert@gmail.com> References: <20250717115412.11424-1-richardbgobert@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Allow binding geneve sockets to local addresses, similar to the VXLAN "local" option. Add a netlink option to configure the local address. Like VXLAN, Geneve sockets can be bound to non-local addresses, meaning they may be UP before their outgoing interfaces. Signed-off-by: Richard Gobert --- drivers/net/geneve.c | 80 +++++++++++++++++++++++++++--- include/net/geneve.h | 6 +++ include/uapi/linux/if_link.h | 2 + tools/include/uapi/linux/if_link.h | 2 + 4 files changed, 82 insertions(+), 8 deletions(-) diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index 54384f9b3872..bc88b9a52410 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -61,6 +61,7 @@ struct geneve_config { bool inner_proto_inherit; u16 port_min; u16 port_max; + union geneve_addr saddr; }; =20 /* Pseudo network device */ @@ -465,7 +466,8 @@ static int geneve_udp_encap_err_lookup(struct sock *sk,= struct sk_buff *skb) } =20 static struct socket *geneve_create_sock(struct net *net, bool ipv6, - __be16 port, bool ipv6_rx_csum) + __be16 port, bool ipv6_rx_csum, + union geneve_addr *local_addr) { struct socket *sock; struct udp_port_cfg udp_conf; @@ -477,11 +479,20 @@ static struct socket *geneve_create_sock(struct net *= net, bool ipv6, udp_conf.family =3D AF_INET6; udp_conf.ipv6_v6only =3D 1; udp_conf.use_udp6_rx_checksums =3D ipv6_rx_csum; +#if IS_ENABLED(CONFIG_IPV6) + memcpy(&udp_conf.local_ip6, + &local_addr->sin6.sin6_addr, + sizeof(local_addr->sin6.sin6_addr)); +#endif } else { udp_conf.family =3D AF_INET; udp_conf.local_ip.s_addr =3D htonl(INADDR_ANY); + memcpy(&udp_conf.local_ip, + &local_addr->sin.sin_addr, + sizeof(local_addr->sin.sin_addr)); } =20 + udp_conf.freebind =3D 1; udp_conf.local_udp_port =3D port; =20 /* Open UDP socket */ @@ -586,7 +597,8 @@ static int geneve_gro_complete(struct sock *sk, struct = sk_buff *skb, =20 /* Create new listen socket if needed */ static struct geneve_sock *geneve_socket_create(struct net *net, __be16 po= rt, - bool ipv6, bool ipv6_rx_csum) + bool ipv6, bool ipv6_rx_csum, + union geneve_addr *local_addr) { struct geneve_net *gn =3D net_generic(net, geneve_net_id); struct geneve_sock *gs; @@ -598,7 +610,7 @@ static struct geneve_sock *geneve_socket_create(struct = net *net, __be16 port, if (!gs) return ERR_PTR(-ENOMEM); =20 - sock =3D geneve_create_sock(net, ipv6, port, ipv6_rx_csum); + sock =3D geneve_create_sock(net, ipv6, port, ipv6_rx_csum, local_addr); if (IS_ERR(sock)) { kfree(gs); return ERR_CAST(sock); @@ -657,12 +669,24 @@ static void geneve_sock_release(struct geneve_dev *ge= neve) =20 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, sa_family_t family, - __be16 dst_port) + __be16 dst_port, + union geneve_addr *saddr) { struct geneve_sock *gs; =20 list_for_each_entry(gs, &gn->sock_list, list) { - if (inet_sk(gs->sock->sk)->inet_sport =3D=3D dst_port && + struct sock *sk =3D gs->sock->sk; + struct inet_sock *inet =3D inet_sk(sk); + + if (family =3D=3D AF_INET && + inet->inet_rcv_saddr !=3D saddr->sin.sin_addr.s_addr) + continue; + + else if (ipv6_addr_cmp(&sk->sk_v6_rcv_saddr, + &saddr->sin6.sin6_addr) !=3D 0) + continue; + + if (inet->inet_sport =3D=3D dst_port && geneve_get_sk_family(gs) =3D=3D family) { return gs; } @@ -679,14 +703,16 @@ static int geneve_sock_add(struct geneve_dev *geneve,= bool ipv6) __u8 vni[3]; __u32 hash; =20 - gs =3D geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.k= ey.tp_dst); + gs =3D geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, + geneve->cfg.info.key.tp_dst, &geneve->cfg.saddr); if (gs) { gs->refcnt++; goto out; } =20 gs =3D geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, - geneve->cfg.use_udp6_rx_checksums); + geneve->cfg.use_udp6_rx_checksums, + &geneve->cfg.saddr); if (IS_ERR(gs)) return PTR_ERR(gs); =20 @@ -1246,6 +1272,8 @@ static const struct nla_policy geneve_policy[IFLA_GEN= EVE_MAX + 1] =3D { [IFLA_GENEVE_DF] =3D { .type =3D NLA_U8 }, [IFLA_GENEVE_INNER_PROTO_INHERIT] =3D { .type =3D NLA_FLAG }, [IFLA_GENEVE_PORT_RANGE] =3D NLA_POLICY_EXACT_LEN(sizeof(struct ifla_gene= ve_port_range)), + [IFLA_GENEVE_LOCAL] =3D NLA_POLICY_EXACT_LEN(sizeof_field(struct iphdr, s= addr)), + [IFLA_GENEVE_LOCAL6] =3D NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), }; =20 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], @@ -1596,6 +1624,32 @@ static int geneve_nl2info(struct nlattr *tb[], struc= t nlattr *data[], cfg->inner_proto_inherit =3D true; } =20 + if (data[IFLA_GENEVE_LOCAL]) { + if (changelink && (ip_tunnel_info_af(info) !=3D AF_INET)) { + attrtype =3D IFLA_GENEVE_LOCAL; + goto change_notsup; + } + + cfg->saddr.sin.sin_addr.s_addr =3D nla_get_in_addr(data[IFLA_GENEVE_LOCA= L]); + cfg->saddr.sa.sa_family =3D AF_INET; + } + + if (data[IFLA_GENEVE_LOCAL6]) { +#if IS_ENABLED(CONFIG_IPV6) + if (changelink && (ip_tunnel_info_af(info) !=3D AF_INET6)) { + attrtype =3D IFLA_GENEVE_LOCAL6; + goto change_notsup; + } + + cfg->saddr.sin6.sin6_addr =3D nla_get_in6_addr(data[IFLA_GENEVE_LOCAL6]); + cfg->saddr.sa.sa_family =3D AF_INET6; +#else + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LOCAL6], + "IPv6 support not enabled in the kernel"); + return -EPFNOSUPPORT; +#endif + } + return 0; change_notsup: NL_SET_ERR_MSG_ATTR(extack, data[attrtype], @@ -1782,6 +1836,7 @@ static size_t geneve_get_size(const struct net_device= *dev) nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ nla_total_size(sizeof(struct ifla_geneve_port_range)) + /* IFLA_GENEVE_P= ORT_RANGE */ + nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_LOCAL{6} */ 0; } =20 @@ -1807,16 +1862,25 @@ static int geneve_fill_info(struct sk_buff *skb, co= nst struct net_device *dev) if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, info->key.u.ipv4.dst)) goto nla_put_failure; + + if (nla_put_in_addr(skb, IFLA_GENEVE_LOCAL, + info->key.u.ipv4.src)) + goto nla_put_failure; + if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags))) goto nla_put_failure; - #if IS_ENABLED(CONFIG_IPV6) } else if (!metadata) { if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, &info->key.u.ipv6.dst)) goto nla_put_failure; + + if (nla_put_in6_addr(skb, IFLA_GENEVE_LOCAL6, + &info->key.u.ipv6.src)) + goto nla_put_failure; + if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, !test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags))) diff --git a/include/net/geneve.h b/include/net/geneve.h index 5c96827a487e..7b12c70db11f 100644 --- a/include/net/geneve.h +++ b/include/net/geneve.h @@ -62,6 +62,12 @@ struct genevehdr { u8 options[]; }; =20 +union geneve_addr { + struct sockaddr_in sin; + struct sockaddr_in6 sin6; + struct sockaddr sa; +}; + static inline bool netif_is_geneve(const struct net_device *dev) { return dev->rtnl_link_ops && diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index 7350129b1444..ff362d76a0d4 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -1442,6 +1442,8 @@ enum { IFLA_GENEVE_DF, IFLA_GENEVE_INNER_PROTO_INHERIT, IFLA_GENEVE_PORT_RANGE, + IFLA_GENEVE_LOCAL, + IFLA_GENEVE_LOCAL6, __IFLA_GENEVE_MAX }; #define IFLA_GENEVE_MAX (__IFLA_GENEVE_MAX - 1) diff --git a/tools/include/uapi/linux/if_link.h b/tools/include/uapi/linux/= if_link.h index eee934cc2cf4..894a1aa91133 100644 --- a/tools/include/uapi/linux/if_link.h +++ b/tools/include/uapi/linux/if_link.h @@ -1438,6 +1438,8 @@ enum { IFLA_GENEVE_TTL_INHERIT, IFLA_GENEVE_DF, IFLA_GENEVE_INNER_PROTO_INHERIT, + IFLA_GENEVE_LOCAL, + IFLA_GENEVE_LOCAL6, __IFLA_GENEVE_MAX }; #define IFLA_GENEVE_MAX (__IFLA_GENEVE_MAX - 1) --=20 2.36.1