diff options
Diffstat (limited to 'drivers/net/geneve.c')
| -rw-r--r-- | drivers/net/geneve.c | 2029 |
1 files changed, 2029 insertions, 0 deletions
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c new file mode 100644 index 000000000..78f9d588f --- /dev/null +++ b/drivers/net/geneve.c @@ -0,0 +1,2029 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * GENEVE: Generic Network Virtualization Encapsulation + * + * Copyright (c) 2015 Red Hat, Inc. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/ethtool.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/etherdevice.h> +#include <linux/hash.h> +#include <net/ipv6_stubs.h> +#include <net/dst_metadata.h> +#include <net/gro_cells.h> +#include <net/rtnetlink.h> +#include <net/geneve.h> +#include <net/gro.h> +#include <net/protocol.h> + +#define GENEVE_NETDEV_VER "0.6" + +#define GENEVE_N_VID (1u << 24) +#define GENEVE_VID_MASK (GENEVE_N_VID - 1) + +#define VNI_HASH_BITS 10 +#define VNI_HASH_SIZE (1<<VNI_HASH_BITS) + +static bool log_ecn_error = true; +module_param(log_ecn_error, bool, 0644); +MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); + +#define GENEVE_VER 0 +#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) +#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) +#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) + +/* per-network namespace private data for this module */ +struct geneve_net { + struct list_head geneve_list; + struct list_head sock_list; +}; + +static unsigned int geneve_net_id; + +struct geneve_dev_node { + struct hlist_node hlist; + struct geneve_dev *geneve; +}; + +struct geneve_config { + struct ip_tunnel_info info; + bool collect_md; + bool use_udp6_rx_checksums; + bool ttl_inherit; + enum ifla_geneve_df df; + bool inner_proto_inherit; +}; + +/* Pseudo network device */ +struct geneve_dev { + struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ +#if IS_ENABLED(CONFIG_IPV6) + struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ +#endif + struct net *net; /* netns for packet i/o */ + struct net_device *dev; /* netdev for geneve tunnel */ + struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ +#if IS_ENABLED(CONFIG_IPV6) + struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ +#endif + struct list_head next; /* geneve's per namespace list */ + struct gro_cells gro_cells; + struct geneve_config cfg; +}; + +struct geneve_sock { + bool collect_md; + struct list_head list; + struct socket *sock; + struct rcu_head rcu; + int refcnt; + struct hlist_head vni_list[VNI_HASH_SIZE]; +}; + +static inline __u32 geneve_net_vni_hash(u8 vni[3]) +{ + __u32 vnid; + + vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; + return hash_32(vnid, VNI_HASH_BITS); +} + +static __be64 vni_to_tunnel_id(const __u8 *vni) +{ +#ifdef __BIG_ENDIAN + return (vni[0] << 16) | (vni[1] << 8) | vni[2]; +#else + return (__force __be64)(((__force u64)vni[0] << 40) | + ((__force u64)vni[1] << 48) | + ((__force u64)vni[2] << 56)); +#endif +} + +/* Convert 64 bit tunnel ID to 24 bit VNI. */ +static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) +{ +#ifdef __BIG_ENDIAN + vni[0] = (__force __u8)(tun_id >> 16); + vni[1] = (__force __u8)(tun_id >> 8); + vni[2] = (__force __u8)tun_id; +#else + vni[0] = (__force __u8)((__force u64)tun_id >> 40); + vni[1] = (__force __u8)((__force u64)tun_id >> 48); + vni[2] = (__force __u8)((__force u64)tun_id >> 56); +#endif +} + +static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) +{ + return !memcmp(vni, &tun_id[5], 3); +} + +static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) +{ + return gs->sock->sk->sk_family; +} + +static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, + __be32 addr, u8 vni[]) +{ + struct hlist_head *vni_list_head; + struct geneve_dev_node *node; + __u32 hash; + + /* Find the device for this VNI */ + hash = geneve_net_vni_hash(vni); + vni_list_head = &gs->vni_list[hash]; + hlist_for_each_entry_rcu(node, vni_list_head, hlist) { + if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && + addr == node->geneve->cfg.info.key.u.ipv4.dst) + return node->geneve; + } + return NULL; +} + +#if IS_ENABLED(CONFIG_IPV6) +static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, + struct in6_addr addr6, u8 vni[]) +{ + struct hlist_head *vni_list_head; + struct geneve_dev_node *node; + __u32 hash; + + /* Find the device for this VNI */ + hash = geneve_net_vni_hash(vni); + vni_list_head = &gs->vni_list[hash]; + hlist_for_each_entry_rcu(node, vni_list_head, hlist) { + if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && + ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) + return node->geneve; + } + return NULL; +} +#endif + +static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) +{ + return (struct genevehdr *)(udp_hdr(skb) + 1); +} + +static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, + struct sk_buff *skb) +{ + static u8 zero_vni[3]; + u8 *vni; + + if (geneve_get_sk_family(gs) == AF_INET) { + struct iphdr *iph; + __be32 addr; + + iph = ip_hdr(skb); /* outer IP header... */ + + if (gs->collect_md) { + vni = zero_vni; + addr = 0; + } else { + vni = geneve_hdr(skb)->vni; + addr = iph->saddr; + } + + return geneve_lookup(gs, addr, vni); +#if IS_ENABLED(CONFIG_IPV6) + } else if (geneve_get_sk_family(gs) == AF_INET6) { + static struct in6_addr zero_addr6; + struct ipv6hdr *ip6h; + struct in6_addr addr6; + + ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ + + if (gs->collect_md) { + vni = zero_vni; + addr6 = zero_addr6; + } else { + vni = geneve_hdr(skb)->vni; + addr6 = ip6h->saddr; + } + + return geneve6_lookup(gs, addr6, vni); +#endif + } + return NULL; +} + +/* geneve receive/decap routine */ +static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, + struct sk_buff *skb) +{ + struct genevehdr *gnvh = geneve_hdr(skb); + struct metadata_dst *tun_dst = NULL; + unsigned int len; + int err = 0; + void *oiph; + + if (ip_tunnel_collect_metadata() || gs->collect_md) { + __be16 flags; + + flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) | + (gnvh->critical ? TUNNEL_CRIT_OPT : 0); + + tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, + vni_to_tunnel_id(gnvh->vni), + gnvh->opt_len * 4); + if (!tun_dst) { + geneve->dev->stats.rx_dropped++; + goto drop; + } + /* Update tunnel dst according to Geneve options. */ + ip_tunnel_info_opts_set(&tun_dst->u.tun_info, + gnvh->options, gnvh->opt_len * 4, + TUNNEL_GENEVE_OPT); + } else { + /* Drop packets w/ critical options, + * since we don't support any... + */ + if (gnvh->critical) { + geneve->dev->stats.rx_frame_errors++; + geneve->dev->stats.rx_errors++; + goto drop; + } + } + + if (tun_dst) + skb_dst_set(skb, &tun_dst->dst); + + if (gnvh->proto_type == htons(ETH_P_TEB)) { + skb_reset_mac_header(skb); + skb->protocol = eth_type_trans(skb, geneve->dev); + skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); + + /* Ignore packet loops (and multicast echo) */ + if (ether_addr_equal(eth_hdr(skb)->h_source, + geneve->dev->dev_addr)) { + geneve->dev->stats.rx_errors++; + goto drop; + } + } else { + skb_reset_mac_header(skb); + skb->dev = geneve->dev; + skb->pkt_type = PACKET_HOST; + } + + oiph = skb_network_header(skb); + skb_reset_network_header(skb); + + if (geneve_get_sk_family(gs) == AF_INET) + err = IP_ECN_decapsulate(oiph, skb); +#if IS_ENABLED(CONFIG_IPV6) + else + err = IP6_ECN_decapsulate(oiph, skb); +#endif + + if (unlikely(err)) { + if (log_ecn_error) { + if (geneve_get_sk_family(gs) == AF_INET) + net_info_ratelimited("non-ECT from %pI4 " + "with TOS=%#x\n", + &((struct iphdr *)oiph)->saddr, + ((struct iphdr *)oiph)->tos); +#if IS_ENABLED(CONFIG_IPV6) + else + net_info_ratelimited("non-ECT from %pI6\n", + &((struct ipv6hdr *)oiph)->saddr); +#endif + } + if (err > 1) { + ++geneve->dev->stats.rx_frame_errors; + ++geneve->dev->stats.rx_errors; + goto drop; + } + } + + len = skb->len; + err = gro_cells_receive(&geneve->gro_cells, skb); + if (likely(err == NET_RX_SUCCESS)) + dev_sw_netstats_rx_add(geneve->dev, len); + + return; +drop: + /* Consume bad packet */ + kfree_skb(skb); +} + +/* Setup stats when device is created */ +static int geneve_init(struct net_device *dev) +{ + struct geneve_dev *geneve = netdev_priv(dev); + int err; + + dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); + if (!dev->tstats) + return -ENOMEM; + + err = gro_cells_init(&geneve->gro_cells, dev); + if (err) { + free_percpu(dev->tstats); + return err; + } + + err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); + if (err) { + free_percpu(dev->tstats); + gro_cells_destroy(&geneve->gro_cells); + return err; + } + return 0; +} + +static void geneve_uninit(struct net_device *dev) +{ + struct geneve_dev *geneve = netdev_priv(dev); + + dst_cache_destroy(&geneve->cfg.info.dst_cache); + gro_cells_destroy(&geneve->gro_cells); + free_percpu(dev->tstats); +} + +/* Callback from net/ipv4/udp.c to receive packets */ +static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) +{ + struct genevehdr *geneveh; + struct geneve_dev *geneve; + struct geneve_sock *gs; + __be16 inner_proto; + int opts_len; + + /* Need UDP and Geneve header to be present */ + if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) + goto drop; + + /* Return packets with reserved bits set */ + geneveh = geneve_hdr(skb); + if (unlikely(geneveh->ver != GENEVE_VER)) + goto drop; + + gs = rcu_dereference_sk_user_data(sk); + if (!gs) + goto drop; + + geneve = geneve_lookup_skb(gs, skb); + if (!geneve) + goto drop; + + inner_proto = geneveh->proto_type; + + if (unlikely((!geneve->cfg.inner_proto_inherit && + inner_proto != htons(ETH_P_TEB)))) { + geneve->dev->stats.rx_dropped++; + goto drop; + } + + opts_len = geneveh->opt_len * 4; + if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto, + !net_eq(geneve->net, dev_net(geneve->dev)))) { + geneve->dev->stats.rx_dropped++; + goto drop; + } + + geneve_rx(geneve, gs, skb); + return 0; + +drop: + /* Consume bad packet */ + kfree_skb(skb); + return 0; +} + +/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ +static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) +{ + struct genevehdr *geneveh; + struct geneve_sock *gs; + u8 zero_vni[3] = { 0 }; + u8 *vni = zero_vni; + + if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) + return -EINVAL; + + geneveh = geneve_hdr(skb); + if (geneveh->ver != GENEVE_VER) + return -EINVAL; + + if (geneveh->proto_type != htons(ETH_P_TEB)) + return -EINVAL; + + gs = rcu_dereference_sk_user_data(sk); + if (!gs) + return -ENOENT; + + if (geneve_get_sk_family(gs) == AF_INET) { + struct iphdr *iph = ip_hdr(skb); + __be32 addr4 = 0; + + if (!gs->collect_md) { + vni = geneve_hdr(skb)->vni; + addr4 = iph->daddr; + } + + return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; + } + +#if IS_ENABLED(CONFIG_IPV6) + if (geneve_get_sk_family(gs) == AF_INET6) { + struct ipv6hdr *ip6h = ipv6_hdr(skb); + struct in6_addr addr6; + + memset(&addr6, 0, sizeof(struct in6_addr)); + + if (!gs->collect_md) { + vni = geneve_hdr(skb)->vni; + addr6 = ip6h->daddr; + } + + return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; + } +#endif + + return -EPFNOSUPPORT; +} + +static struct socket *geneve_create_sock(struct net *net, bool ipv6, + __be16 port, bool ipv6_rx_csum) +{ + struct socket *sock; + struct udp_port_cfg udp_conf; + int err; + + memset(&udp_conf, 0, sizeof(udp_conf)); + + if (ipv6) { + udp_conf.family = AF_INET6; + udp_conf.ipv6_v6only = 1; + udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; + } else { + udp_conf.family = AF_INET; + udp_conf.local_ip.s_addr = htonl(INADDR_ANY); + } + + udp_conf.local_udp_port = port; + + /* Open UDP socket */ + err = udp_sock_create(net, &udp_conf, &sock); + if (err < 0) + return ERR_PTR(err); + + udp_allow_gso(sock->sk); + return sock; +} + +static int geneve_hlen(struct genevehdr *gh) +{ + return sizeof(*gh) + gh->opt_len * 4; +} + +static struct sk_buff *geneve_gro_receive(struct sock *sk, + struct list_head *head, + struct sk_buff *skb) +{ + struct sk_buff *pp = NULL; + struct sk_buff *p; + struct genevehdr *gh, *gh2; + unsigned int hlen, gh_len, off_gnv; + const struct packet_offload *ptype; + __be16 type; + int flush = 1; + + off_gnv = skb_gro_offset(skb); + hlen = off_gnv + sizeof(*gh); + gh = skb_gro_header(skb, hlen, off_gnv); + if (unlikely(!gh)) + goto out; + + if (gh->ver != GENEVE_VER || gh->oam) + goto out; + gh_len = geneve_hlen(gh); + + hlen = off_gnv + gh_len; + if (skb_gro_header_hard(skb, hlen)) { + gh = skb_gro_header_slow(skb, hlen, off_gnv); + if (unlikely(!gh)) + goto out; + } + + list_for_each_entry(p, head, list) { + if (!NAPI_GRO_CB(p)->same_flow) + continue; + + gh2 = (struct genevehdr *)(p->data + off_gnv); + if (gh->opt_len != gh2->opt_len || + memcmp(gh, gh2, gh_len)) { + NAPI_GRO_CB(p)->same_flow = 0; + continue; + } + } + + skb_gro_pull(skb, gh_len); + skb_gro_postpull_rcsum(skb, gh, gh_len); + type = gh->proto_type; + if (likely(type == htons(ETH_P_TEB))) + return call_gro_receive(eth_gro_receive, head, skb); + + ptype = gro_find_receive_by_type(type); + if (!ptype) + goto out; + + pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); + flush = 0; + +out: + skb_gro_flush_final(skb, pp, flush); + + return pp; +} + +static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, + int nhoff) +{ + struct genevehdr *gh; + struct packet_offload *ptype; + __be16 type; + int gh_len; + int err = -ENOSYS; + + gh = (struct genevehdr *)(skb->data + nhoff); + gh_len = geneve_hlen(gh); + type = gh->proto_type; + + /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */ + if (likely(type == htons(ETH_P_TEB))) + return eth_gro_complete(skb, nhoff + gh_len); + + ptype = gro_find_complete_by_type(type); + if (ptype) + err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); + + skb_set_inner_mac_header(skb, nhoff + gh_len); + + return err; +} + +/* Create new listen socket if needed */ +static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, + bool ipv6, bool ipv6_rx_csum) +{ + struct geneve_net *gn = net_generic(net, geneve_net_id); + struct geneve_sock *gs; + struct socket *sock; + struct udp_tunnel_sock_cfg tunnel_cfg; + int h; + + gs = kzalloc(sizeof(*gs), GFP_KERNEL); + if (!gs) + return ERR_PTR(-ENOMEM); + + sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); + if (IS_ERR(sock)) { + kfree(gs); + return ERR_CAST(sock); + } + + gs->sock = sock; + gs->refcnt = 1; + for (h = 0; h < VNI_HASH_SIZE; ++h) + INIT_HLIST_HEAD(&gs->vni_list[h]); + + /* Initialize the geneve udp offloads structure */ + udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); + + /* Mark socket as an encapsulation socket */ + memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); + tunnel_cfg.sk_user_data = gs; + tunnel_cfg.encap_type = 1; + tunnel_cfg.gro_receive = geneve_gro_receive; + tunnel_cfg.gro_complete = geneve_gro_complete; + tunnel_cfg.encap_rcv = geneve_udp_encap_recv; + tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; + tunnel_cfg.encap_destroy = NULL; + setup_udp_tunnel_sock(net, sock, &tunnel_cfg); + list_add(&gs->list, &gn->sock_list); + return gs; +} + +static void __geneve_sock_release(struct geneve_sock *gs) +{ + if (!gs || --gs->refcnt) + return; + + list_del(&gs->list); + udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); + udp_tunnel_sock_release(gs->sock); + kfree_rcu(gs, rcu); +} + +static void geneve_sock_release(struct geneve_dev *geneve) +{ + struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); +#if IS_ENABLED(CONFIG_IPV6) + struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); + + rcu_assign_pointer(geneve->sock6, NULL); +#endif + + rcu_assign_pointer(geneve->sock4, NULL); + synchronize_net(); + + __geneve_sock_release(gs4); +#if IS_ENABLED(CONFIG_IPV6) + __geneve_sock_release(gs6); +#endif +} + +static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, + sa_family_t family, + __be16 dst_port) +{ + struct geneve_sock *gs; + + list_for_each_entry(gs, &gn->sock_list, list) { + if (inet_sk(gs->sock->sk)->inet_sport == dst_port && + geneve_get_sk_family(gs) == family) { + return gs; + } + } + return NULL; +} + +static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) +{ + struct net *net = geneve->net; + struct geneve_net *gn = net_generic(net, geneve_net_id); + struct geneve_dev_node *node; + struct geneve_sock *gs; + __u8 vni[3]; + __u32 hash; + + gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); + if (gs) { + gs->refcnt++; + goto out; + } + + gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, + geneve->cfg.use_udp6_rx_checksums); + if (IS_ERR(gs)) + return PTR_ERR(gs); + +out: + gs->collect_md = geneve->cfg.collect_md; +#if IS_ENABLED(CONFIG_IPV6) + if (ipv6) { + rcu_assign_pointer(geneve->sock6, gs); + node = &geneve->hlist6; + } else +#endif + { + rcu_assign_pointer(geneve->sock4, gs); + node = &geneve->hlist4; + } + node->geneve = geneve; + + tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); + hash = geneve_net_vni_hash(vni); + hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); + return 0; +} + +static int geneve_open(struct net_device *dev) +{ + struct geneve_dev *geneve = netdev_priv(dev); + bool metadata = geneve->cfg.collect_md; + bool ipv4, ipv6; + int ret = 0; + + ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; + ipv4 = !ipv6 || metadata; +#if IS_ENABLED(CONFIG_IPV6) + if (ipv6) { + ret = geneve_sock_add(geneve, true); + if (ret < 0 && ret != -EAFNOSUPPORT) + ipv4 = false; + } +#endif + if (ipv4) + ret = geneve_sock_add(geneve, false); + if (ret < 0) + geneve_sock_release(geneve); + + return ret; +} + +static int geneve_stop(struct net_device *dev) +{ + struct geneve_dev *geneve = netdev_priv(dev); + + hlist_del_init_rcu(&geneve->hlist4.hlist); +#if IS_ENABLED(CONFIG_IPV6) + hlist_del_init_rcu(&geneve->hlist6.hlist); +#endif + geneve_sock_release(geneve); + return 0; +} + +static void geneve_build_header(struct genevehdr *geneveh, + const struct ip_tunnel_info *info, + __be16 inner_proto) +{ + geneveh->ver = GENEVE_VER; + geneveh->opt_len = info->options_len / 4; + geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); + geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); + geneveh->rsvd1 = 0; + tunnel_id_to_vni(info->key.tun_id, geneveh->vni); + geneveh->proto_type = inner_proto; + geneveh->rsvd2 = 0; + + if (info->key.tun_flags & TUNNEL_GENEVE_OPT) + ip_tunnel_info_opts_get(geneveh->options, info); +} + +static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, + const struct ip_tunnel_info *info, + bool xnet, int ip_hdr_len, + bool inner_proto_inherit) +{ + bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); + struct genevehdr *gnvh; + __be16 inner_proto; + int min_headroom; + int err; + + skb_reset_mac_header(skb); + skb_scrub_packet(skb, xnet); + + min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + + GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; + err = skb_cow_head(skb, min_headroom); + if (unlikely(err)) + goto free_dst; + + err = udp_tunnel_handle_offloads(skb, udp_sum); + if (err) + goto free_dst; + + gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); + inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); + geneve_build_header(gnvh, info, inner_proto); + skb_set_inner_protocol(skb, inner_proto); + return 0; + +free_dst: + dst_release(dst); + return err; +} + +static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, + struct net_device *dev, + struct geneve_sock *gs4, + struct flowi4 *fl4, + const struct ip_tunnel_info *info, + __be16 dport, __be16 sport, + __u8 *full_tos) +{ + bool use_cache = ip_tunnel_dst_cache_usable(skb, info); + struct geneve_dev *geneve = netdev_priv(dev); + struct dst_cache *dst_cache; + struct rtable *rt = NULL; + __u8 tos; + + if (!gs4) + return ERR_PTR(-EIO); + + memset(fl4, 0, sizeof(*fl4)); + fl4->flowi4_mark = skb->mark; + fl4->flowi4_proto = IPPROTO_UDP; + fl4->daddr = info->key.u.ipv4.dst; + fl4->saddr = info->key.u.ipv4.src; + fl4->fl4_dport = dport; + fl4->fl4_sport = sport; + fl4->flowi4_flags = info->key.flow_flags; + + tos = info->key.tos; + if ((tos == 1) && !geneve->cfg.collect_md) { + tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); + use_cache = false; + } + fl4->flowi4_tos = RT_TOS(tos); + if (full_tos) + *full_tos = tos; + + dst_cache = (struct dst_cache *)&info->dst_cache; + if (use_cache) { + rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); + if (rt) + return rt; + } + rt = ip_route_output_key(geneve->net, fl4); + if (IS_ERR(rt)) { + netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); + return ERR_PTR(-ENETUNREACH); + } + if (rt->dst.dev == dev) { /* is this necessary? */ + netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); + ip_rt_put(rt); + return ERR_PTR(-ELOOP); + } + if (use_cache) + dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); + return rt; +} + +#if IS_ENABLED(CONFIG_IPV6) +static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, + struct net_device *dev, + struct geneve_sock *gs6, + struct flowi6 *fl6, + const struct ip_tunnel_info *info, + __be16 dport, __be16 sport) +{ + bool use_cache = ip_tunnel_dst_cache_usable(skb, info); + struct geneve_dev *geneve = netdev_priv(dev); + struct dst_entry *dst = NULL; + struct dst_cache *dst_cache; + __u8 prio; + + if (!gs6) + return ERR_PTR(-EIO); + + memset(fl6, 0, sizeof(*fl6)); + fl6->flowi6_mark = skb->mark; + fl6->flowi6_proto = IPPROTO_UDP; + fl6->daddr = info->key.u.ipv6.dst; + fl6->saddr = info->key.u.ipv6.src; + fl6->fl6_dport = dport; + fl6->fl6_sport = sport; + + prio = info->key.tos; + if ((prio == 1) && !geneve->cfg.collect_md) { + prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); + use_cache = false; + } + + fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label); + dst_cache = (struct dst_cache *)&info->dst_cache; + if (use_cache) { + dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); + if (dst) + return dst; + } + dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, + NULL); + if (IS_ERR(dst)) { + netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); + return ERR_PTR(-ENETUNREACH); + } + if (dst->dev == dev) { /* is this necessary? */ + netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); + dst_release(dst); + return ERR_PTR(-ELOOP); + } + + if (use_cache) + dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); + return dst; +} +#endif + +static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, + struct geneve_dev *geneve, + const struct ip_tunnel_info *info) +{ + bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); + struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); + const struct ip_tunnel_key *key = &info->key; + struct rtable *rt; + struct flowi4 fl4; + __u8 full_tos; + __u8 tos, ttl; + __be16 df = 0; + __be16 sport; + int err; + + if (!pskb_inet_may_pull(skb)) + return -EINVAL; + + sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); + rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, + geneve->cfg.info.key.tp_dst, sport, &full_tos); + if (IS_ERR(rt)) + return PTR_ERR(rt); + + err = skb_tunnel_check_pmtu(skb, &rt->dst, + GENEVE_IPV4_HLEN + info->options_len, + netif_is_any_bridge_port(dev)); + if (err < 0) { + dst_release(&rt->dst); + return err; + } else if (err) { + struct ip_tunnel_info *info; + + info = skb_tunnel_info(skb); + if (info) { + struct ip_tunnel_info *unclone; + + unclone = skb_tunnel_info_unclone(skb); + if (unlikely(!unclone)) { + dst_release(&rt->dst); + return -ENOMEM; + } + + unclone->key.u.ipv4.dst = fl4.saddr; + unclone->key.u.ipv4.src = fl4.daddr; + } + + if (!pskb_may_pull(skb, ETH_HLEN)) { + dst_release(&rt->dst); + return -EINVAL; + } + + skb->protocol = eth_type_trans(skb, geneve->dev); + __netif_rx(skb); + dst_release(&rt->dst); + return -EMSGSIZE; + } + + if (geneve->cfg.collect_md) { + tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); + ttl = key->ttl; + + df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; + } else { + tos = ip_tunnel_ecn_encap(full_tos, ip_hdr(skb), skb); + if (geneve->cfg.ttl_inherit) + ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); + else + ttl = key->ttl; + ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); + + if (geneve->cfg.df == GENEVE_DF_SET) { + df = htons(IP_DF); + } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { + struct ethhdr *eth = eth_hdr(skb); + + if (ntohs(eth->h_proto) == ETH_P_IPV6) { + df = htons(IP_DF); + } else if (ntohs(eth->h_proto) == ETH_P_IP) { + struct iphdr *iph = ip_hdr(skb); + + if (iph->frag_off & htons(IP_DF)) + df = htons(IP_DF); + } + } + } + + err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr), + geneve->cfg.inner_proto_inherit); + if (unlikely(err)) + return err; + + udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, + tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, + !net_eq(geneve->net, dev_net(geneve->dev)), + !(info->key.tun_flags & TUNNEL_CSUM)); + return 0; +} + +#if IS_ENABLED(CONFIG_IPV6) +static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, + struct geneve_dev *geneve, + const struct ip_tunnel_info *info) +{ + bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); + struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); + const struct ip_tunnel_key *key = &info->key; + struct dst_entry *dst = NULL; + struct flowi6 fl6; + __u8 prio, ttl; + __be16 sport; + int err; + + if (!pskb_inet_may_pull(skb)) + return -EINVAL; + + sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); + dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, + geneve->cfg.info.key.tp_dst, sport); + if (IS_ERR(dst)) + return PTR_ERR(dst); + + err = skb_tunnel_check_pmtu(skb, dst, + GENEVE_IPV6_HLEN + info->options_len, + netif_is_any_bridge_port(dev)); + if (err < 0) { + dst_release(dst); + return err; + } else if (err) { + struct ip_tunnel_info *info = skb_tunnel_info(skb); + + if (info) { + struct ip_tunnel_info *unclone; + + unclone = skb_tunnel_info_unclone(skb); + if (unlikely(!unclone)) { + dst_release(dst); + return -ENOMEM; + } + + unclone->key.u.ipv6.dst = fl6.saddr; + unclone->key.u.ipv6.src = fl6.daddr; + } + + if (!pskb_may_pull(skb, ETH_HLEN)) { + dst_release(dst); + return -EINVAL; + } + + skb->protocol = eth_type_trans(skb, geneve->dev); + __netif_rx(skb); + dst_release(dst); + return -EMSGSIZE; + } + + if (geneve->cfg.collect_md) { + prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); + ttl = key->ttl; + } else { + prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), + ip_hdr(skb), skb); + if (geneve->cfg.ttl_inherit) + ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); + else + ttl = key->ttl; + ttl = ttl ? : ip6_dst_hoplimit(dst); + } + err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr), + geneve->cfg.inner_proto_inherit); + if (unlikely(err)) + return err; + + udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, + &fl6.saddr, &fl6.daddr, prio, ttl, + info->key.label, sport, geneve->cfg.info.key.tp_dst, + !(info->key.tun_flags & TUNNEL_CSUM)); + return 0; +} +#endif + +static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct geneve_dev *geneve = netdev_priv(dev); + struct ip_tunnel_info *info = NULL; + int err; + + if (geneve->cfg.collect_md) { + info = skb_tunnel_info(skb); + if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { + netdev_dbg(dev, "no tunnel metadata\n"); + dev_kfree_skb(skb); + dev->stats.tx_dropped++; + return NETDEV_TX_OK; + } + } else { + info = &geneve->cfg.info; + } + + rcu_read_lock(); +#if IS_ENABLED(CONFIG_IPV6) + if (info->mode & IP_TUNNEL_INFO_IPV6) + err = geneve6_xmit_skb(skb, dev, geneve, info); + else +#endif + err = geneve_xmit_skb(skb, dev, geneve, info); + rcu_read_unlock(); + + if (likely(!err)) + return NETDEV_TX_OK; + + if (err != -EMSGSIZE) + dev_kfree_skb(skb); + + if (err == -ELOOP) + dev->stats.collisions++; + else if (err == -ENETUNREACH) + dev->stats.tx_carrier_errors++; + + dev->stats.tx_errors++; + return NETDEV_TX_OK; +} + +static int geneve_change_mtu(struct net_device *dev, int new_mtu) +{ + if (new_mtu > dev->max_mtu) + new_mtu = dev->max_mtu; + else if (new_mtu < dev->min_mtu) + new_mtu = dev->min_mtu; + + dev->mtu = new_mtu; + return 0; +} + +static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) +{ + struct ip_tunnel_info *info = skb_tunnel_info(skb); + struct geneve_dev *geneve = netdev_priv(dev); + __be16 sport; + + if (ip_tunnel_info_af(info) == AF_INET) { + struct rtable *rt; + struct flowi4 fl4; + + struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); + sport = udp_flow_src_port(geneve->net, skb, + 1, USHRT_MAX, true); + + rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, + geneve->cfg.info.key.tp_dst, sport, NULL); + if (IS_ERR(rt)) + return PTR_ERR(rt); + + ip_rt_put(rt); + info->key.u.ipv4.src = fl4.saddr; +#if IS_ENABLED(CONFIG_IPV6) + } else if (ip_tunnel_info_af(info) == AF_INET6) { + struct dst_entry *dst; + struct flowi6 fl6; + + struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); + sport = udp_flow_src_port(geneve->net, skb, + 1, USHRT_MAX, true); + + dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, + geneve->cfg.info.key.tp_dst, sport); + if (IS_ERR(dst)) + return PTR_ERR(dst); + + dst_release(dst); + info->key.u.ipv6.src = fl6.saddr; +#endif + } else { + return -EINVAL; + } + + info->key.tp_src = sport; + info->key.tp_dst = geneve->cfg.info.key.tp_dst; + return 0; +} + +static const struct net_device_ops geneve_netdev_ops = { + .ndo_init = geneve_init, + .ndo_uninit = geneve_uninit, + .ndo_open = geneve_open, + .ndo_stop = geneve_stop, + .ndo_start_xmit = geneve_xmit, + .ndo_get_stats64 = dev_get_tstats64, + .ndo_change_mtu = geneve_change_mtu, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_mac_address = eth_mac_addr, + .ndo_fill_metadata_dst = geneve_fill_metadata_dst, +}; + +static void geneve_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *drvinfo) +{ + strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); + strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); +} + +static const struct ethtool_ops geneve_ethtool_ops = { + .get_drvinfo = geneve_get_drvinfo, + .get_link = ethtool_op_get_link, +}; + +/* Info for udev, that this is a virtual tunnel endpoint */ +static struct device_type geneve_type = { + .name = "geneve", +}; + +/* Calls the ndo_udp_tunnel_add of the caller in order to + * supply the listening GENEVE udp ports. Callers are expected + * to implement the ndo_udp_tunnel_add. + */ +static void geneve_offload_rx_ports(struct net_device *dev, bool push) +{ + struct net *net = dev_net(dev); + struct geneve_net *gn = net_generic(net, geneve_net_id); + struct geneve_sock *gs; + + rcu_read_lock(); + list_for_each_entry_rcu(gs, &gn->sock_list, list) { + if (push) { + udp_tunnel_push_rx_port(dev, gs->sock, + UDP_TUNNEL_TYPE_GENEVE); + } else { + udp_tunnel_drop_rx_port(dev, gs->sock, + UDP_TUNNEL_TYPE_GENEVE); + } + } + rcu_read_unlock(); +} + +/* Initialize the device structure. */ +static void geneve_setup(struct net_device *dev) +{ + ether_setup(dev); + + dev->netdev_ops = &geneve_netdev_ops; + dev->ethtool_ops = &geneve_ethtool_ops; + dev->needs_free_netdev = true; + + SET_NETDEV_DEVTYPE(dev, &geneve_type); + + dev->features |= NETIF_F_LLTX; + dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; + dev->features |= NETIF_F_RXCSUM; + dev->features |= NETIF_F_GSO_SOFTWARE; + + dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; + dev->hw_features |= NETIF_F_RXCSUM; + dev->hw_features |= NETIF_F_GSO_SOFTWARE; + + /* MTU range: 68 - (something less than 65535) */ + dev->min_mtu = ETH_MIN_MTU; + /* The max_mtu calculation does not take account of GENEVE + * options, to avoid excluding potentially valid + * configurations. This will be further reduced by IPvX hdr size. + */ + dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; + + netif_keep_dst(dev); + dev->priv_flags &= ~IFF_TX_SKB_SHARING; + dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; + eth_hw_addr_random(dev); +} + +static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { + [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, + [IFLA_GENEVE_ID] = { .type = NLA_U32 }, + [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, + [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, + [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, + [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, + [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, + [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, + [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, + [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, + [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, + [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, + [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, + [IFLA_GENEVE_DF] = { .type = NLA_U8 }, + [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, +}; + +static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + if (tb[IFLA_ADDRESS]) { + if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { + NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], + "Provided link layer address is not Ethernet"); + return -EINVAL; + } + + if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { + NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], + "Provided Ethernet address is not unicast"); + return -EADDRNOTAVAIL; + } + } + + if (!data) { + NL_SET_ERR_MSG(extack, + "Not enough attributes provided to perform the operation"); + return -EINVAL; + } + + if (data[IFLA_GENEVE_ID]) { + __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); + + if (vni >= GENEVE_N_VID) { + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], + "Geneve ID must be lower than 16777216"); + return -ERANGE; + } + } + + if (data[IFLA_GENEVE_DF]) { + enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); + + if (df < 0 || df > GENEVE_DF_MAX) { + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], + "Invalid DF attribute"); + return -EINVAL; + } + } + + return 0; +} + +static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, + const struct ip_tunnel_info *info, + bool *tun_on_same_port, + bool *tun_collect_md) +{ + struct geneve_dev *geneve, *t = NULL; + + *tun_on_same_port = false; + *tun_collect_md = false; + list_for_each_entry(geneve, &gn->geneve_list, next) { + if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { + *tun_collect_md = geneve->cfg.collect_md; + *tun_on_same_port = true; + } + if (info->key.tun_id == geneve->cfg.info.key.tun_id && + info->key.tp_dst == geneve->cfg.info.key.tp_dst && + !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) + t = geneve; + } + return t; +} + +static bool is_tnl_info_zero(const struct ip_tunnel_info *info) +{ + return !(info->key.tun_id || info->key.tun_flags || info->key.tos || + info->key.ttl || info->key.label || info->key.tp_src || + memchr_inv(&info->key.u, 0, sizeof(info->key.u))); +} + +static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, + struct ip_tunnel_info *b) +{ + if (ip_tunnel_info_af(a) == AF_INET) + return a->key.u.ipv4.dst == b->key.u.ipv4.dst; + else + return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); +} + +static int geneve_configure(struct net *net, struct net_device *dev, + struct netlink_ext_ack *extack, + const struct geneve_config *cfg) +{ + struct geneve_net *gn = net_generic(net, geneve_net_id); + struct geneve_dev *t, *geneve = netdev_priv(dev); + const struct ip_tunnel_info *info = &cfg->info; + bool tun_collect_md, tun_on_same_port; + int err, encap_len; + + if (cfg->collect_md && !is_tnl_info_zero(info)) { + NL_SET_ERR_MSG(extack, + "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); + return -EINVAL; + } + + geneve->net = net; + geneve->dev = dev; + + t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); + if (t) + return -EBUSY; + + /* make enough headroom for basic scenario */ + encap_len = GENEVE_BASE_HLEN + ETH_HLEN; + if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { + encap_len += sizeof(struct iphdr); + dev->max_mtu -= sizeof(struct iphdr); + } else { + encap_len += sizeof(struct ipv6hdr); + dev->max_mtu -= sizeof(struct ipv6hdr); + } + dev->needed_headroom = encap_len + ETH_HLEN; + + if (cfg->collect_md) { + if (tun_on_same_port) { + NL_SET_ERR_MSG(extack, + "There can be only one externally controlled device on a destination port"); + return -EPERM; + } + } else { + if (tun_collect_md) { + NL_SET_ERR_MSG(extack, + "There already exists an externally controlled device on this destination port"); + return -EPERM; + } + } + + dst_cache_reset(&geneve->cfg.info.dst_cache); + memcpy(&geneve->cfg, cfg, sizeof(*cfg)); + + if (geneve->cfg.inner_proto_inherit) { + dev->header_ops = NULL; + dev->type = ARPHRD_NONE; + dev->hard_header_len = 0; + dev->addr_len = 0; + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + } + + err = register_netdevice(dev); + if (err) + return err; + + list_add(&geneve->next, &gn->geneve_list); + return 0; +} + +static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) +{ + memset(info, 0, sizeof(*info)); + info->key.tp_dst = htons(dst_port); +} + +static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack, + struct geneve_config *cfg, bool changelink) +{ + struct ip_tunnel_info *info = &cfg->info; + int attrtype; + + if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { + NL_SET_ERR_MSG(extack, + "Cannot specify both IPv4 and IPv6 Remote addresses"); + return -EINVAL; + } + + if (data[IFLA_GENEVE_REMOTE]) { + if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { + attrtype = IFLA_GENEVE_REMOTE; + goto change_notsup; + } + + info->key.u.ipv4.dst = + nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); + + if (ipv4_is_multicast(info->key.u.ipv4.dst)) { + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], + "Remote IPv4 address cannot be Multicast"); + return -EINVAL; + } + } + + if (data[IFLA_GENEVE_REMOTE6]) { +#if IS_ENABLED(CONFIG_IPV6) + if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { + attrtype = IFLA_GENEVE_REMOTE6; + goto change_notsup; + } + + info->mode = IP_TUNNEL_INFO_IPV6; + info->key.u.ipv6.dst = + nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); + + if (ipv6_addr_type(&info->key.u.ipv6.dst) & + IPV6_ADDR_LINKLOCAL) { + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], + "Remote IPv6 address cannot be link-local"); + return -EINVAL; + } + if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], + "Remote IPv6 address cannot be Multicast"); + return -EINVAL; + } + info->key.tun_flags |= TUNNEL_CSUM; + cfg->use_udp6_rx_checksums = true; +#else + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], + "IPv6 support not enabled in the kernel"); + return -EPFNOSUPPORT; +#endif + } + + if (data[IFLA_GENEVE_ID]) { + __u32 vni; + __u8 tvni[3]; + __be64 tunid; + + vni = nla_get_u32(data[IFLA_GENEVE_ID]); + tvni[0] = (vni & 0x00ff0000) >> 16; + tvni[1] = (vni & 0x0000ff00) >> 8; + tvni[2] = vni & 0x000000ff; + + tunid = vni_to_tunnel_id(tvni); + if (changelink && (tunid != info->key.tun_id)) { + attrtype = IFLA_GENEVE_ID; + goto change_notsup; + } + info->key.tun_id = tunid; + } + + if (data[IFLA_GENEVE_TTL_INHERIT]) { + if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) + cfg->ttl_inherit = true; + else + cfg->ttl_inherit = false; + } else if (data[IFLA_GENEVE_TTL]) { + info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); + cfg->ttl_inherit = false; + } + + if (data[IFLA_GENEVE_TOS]) + info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); + + if (data[IFLA_GENEVE_DF]) + cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); + + if (data[IFLA_GENEVE_LABEL]) { + info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & + IPV6_FLOWLABEL_MASK; + if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], + "Label attribute only applies for IPv6 Geneve devices"); + return -EINVAL; + } + } + + if (data[IFLA_GENEVE_PORT]) { + if (changelink) { + attrtype = IFLA_GENEVE_PORT; + goto change_notsup; + } + info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); + } + + if (data[IFLA_GENEVE_COLLECT_METADATA]) { + if (changelink) { + attrtype = IFLA_GENEVE_COLLECT_METADATA; + goto change_notsup; + } + cfg->collect_md = true; + } + + if (data[IFLA_GENEVE_UDP_CSUM]) { + if (changelink) { + attrtype = IFLA_GENEVE_UDP_CSUM; + goto change_notsup; + } + if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) + info->key.tun_flags |= TUNNEL_CSUM; + } + + if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { +#if IS_ENABLED(CONFIG_IPV6) + if (changelink) { + attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; + goto change_notsup; + } + if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) + info->key.tun_flags &= ~TUNNEL_CSUM; +#else + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], + "IPv6 support not enabled in the kernel"); + return -EPFNOSUPPORT; +#endif + } + + if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { +#if IS_ENABLED(CONFIG_IPV6) + if (changelink) { + attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; + goto change_notsup; + } + if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) + cfg->use_udp6_rx_checksums = false; +#else + NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], + "IPv6 support not enabled in the kernel"); + return -EPFNOSUPPORT; +#endif + } + + if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { + if (changelink) { + attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; + goto change_notsup; + } + cfg->inner_proto_inherit = true; + } + + return 0; +change_notsup: + NL_SET_ERR_MSG_ATTR(extack, data[attrtype], + "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); + return -EOPNOTSUPP; +} + +static void geneve_link_config(struct net_device *dev, + struct ip_tunnel_info *info, struct nlattr *tb[]) +{ + struct geneve_dev *geneve = netdev_priv(dev); + int ldev_mtu = 0; + + if (tb[IFLA_MTU]) { + geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); + return; + } + + switch (ip_tunnel_info_af(info)) { + case AF_INET: { + struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; + struct rtable *rt = ip_route_output_key(geneve->net, &fl4); + + if (!IS_ERR(rt) && rt->dst.dev) { + ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; + ip_rt_put(rt); + } + break; + } +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: { + struct rt6_info *rt; + + if (!__in6_dev_get(dev)) + break; + + rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, + NULL, 0); + + if (rt && rt->dst.dev) + ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; + ip6_rt_put(rt); + break; + } +#endif + } + + if (ldev_mtu <= 0) + return; + + geneve_change_mtu(dev, ldev_mtu - info->options_len); +} + +static int geneve_newlink(struct net *net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct geneve_config cfg = { + .df = GENEVE_DF_UNSET, + .use_udp6_rx_checksums = false, + .ttl_inherit = false, + .collect_md = false, + }; + int err; + + init_tnl_info(&cfg.info, GENEVE_UDP_PORT); + err = geneve_nl2info(tb, data, extack, &cfg, false); + if (err) + return err; + + err = geneve_configure(net, dev, extack, &cfg); + if (err) + return err; + + geneve_link_config(dev, &cfg.info, tb); + + return 0; +} + +/* Quiesces the geneve device data path for both TX and RX. + * + * On transmit geneve checks for non-NULL geneve_sock before it proceeds. + * So, if we set that socket to NULL under RCU and wait for synchronize_net() + * to complete for the existing set of in-flight packets to be transmitted, + * then we would have quiesced the transmit data path. All the future packets + * will get dropped until we unquiesce the data path. + * + * On receive geneve dereference the geneve_sock stashed in the socket. So, + * if we set that to NULL under RCU and wait for synchronize_net() to + * complete, then we would have quiesced the receive data path. + */ +static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, + struct geneve_sock **gs6) +{ + *gs4 = rtnl_dereference(geneve->sock4); + rcu_assign_pointer(geneve->sock4, NULL); + if (*gs4) + rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); +#if IS_ENABLED(CONFIG_IPV6) + *gs6 = rtnl_dereference(geneve->sock6); + rcu_assign_pointer(geneve->sock6, NULL); + if (*gs6) + rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); +#else + *gs6 = NULL; +#endif + synchronize_net(); +} + +/* Resumes the geneve device data path for both TX and RX. */ +static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, + struct geneve_sock __maybe_unused *gs6) +{ + rcu_assign_pointer(geneve->sock4, gs4); + if (gs4) + rcu_assign_sk_user_data(gs4->sock->sk, gs4); +#if IS_ENABLED(CONFIG_IPV6) + rcu_assign_pointer(geneve->sock6, gs6); + if (gs6) + rcu_assign_sk_user_data(gs6->sock->sk, gs6); +#endif + synchronize_net(); +} + +static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], + struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct geneve_dev *geneve = netdev_priv(dev); + struct geneve_sock *gs4, *gs6; + struct geneve_config cfg; + int err; + + /* If the geneve device is configured for metadata (or externally + * controlled, for example, OVS), then nothing can be changed. + */ + if (geneve->cfg.collect_md) + return -EOPNOTSUPP; + + /* Start with the existing info. */ + memcpy(&cfg, &geneve->cfg, sizeof(cfg)); + err = geneve_nl2info(tb, data, extack, &cfg, true); + if (err) + return err; + + if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { + dst_cache_reset(&cfg.info.dst_cache); + geneve_link_config(dev, &cfg.info, tb); + } + + geneve_quiesce(geneve, &gs4, &gs6); + memcpy(&geneve->cfg, &cfg, sizeof(cfg)); + geneve_unquiesce(geneve, gs4, gs6); + + return 0; +} + +static void geneve_dellink(struct net_device *dev, struct list_head *head) +{ + struct geneve_dev *geneve = netdev_priv(dev); + + list_del(&geneve->next); + unregister_netdevice_queue(dev, head); +} + +static size_t geneve_get_size(const struct net_device *dev) +{ + return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ + nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ + nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ + nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ + nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ + nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ + nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ + nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ + nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ + nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ + nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ + nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ + nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ + 0; +} + +static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) +{ + struct geneve_dev *geneve = netdev_priv(dev); + struct ip_tunnel_info *info = &geneve->cfg.info; + bool ttl_inherit = geneve->cfg.ttl_inherit; + bool metadata = geneve->cfg.collect_md; + __u8 tmp_vni[3]; + __u32 vni; + + tunnel_id_to_vni(info->key.tun_id, tmp_vni); + vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; + if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) + goto nla_put_failure; + + if (!metadata && ip_tunnel_info_af(info) == AF_INET) { + if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, + info->key.u.ipv4.dst)) + goto nla_put_failure; + if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, + !!(info->key.tun_flags & TUNNEL_CSUM))) + 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_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, + !(info->key.tun_flags & TUNNEL_CSUM))) + goto nla_put_failure; +#endif + } + + if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || + nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || + nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) + goto nla_put_failure; + + if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) + goto nla_put_failure; + + if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) + goto nla_put_failure; + +#if IS_ENABLED(CONFIG_IPV6) + if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, + !geneve->cfg.use_udp6_rx_checksums)) + goto nla_put_failure; +#endif + + if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) + goto nla_put_failure; + + if (geneve->cfg.inner_proto_inherit && + nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static struct rtnl_link_ops geneve_link_ops __read_mostly = { + .kind = "geneve", + .maxtype = IFLA_GENEVE_MAX, + .policy = geneve_policy, + .priv_size = sizeof(struct geneve_dev), + .setup = geneve_setup, + .validate = geneve_validate, + .newlink = geneve_newlink, + .changelink = geneve_changelink, + .dellink = geneve_dellink, + .get_size = geneve_get_size, + .fill_info = geneve_fill_info, +}; + +struct net_device *geneve_dev_create_fb(struct net *net, const char *name, + u8 name_assign_type, u16 dst_port) +{ + struct nlattr *tb[IFLA_MAX + 1]; + struct net_device *dev; + LIST_HEAD(list_kill); + int err; + struct geneve_config cfg = { + .df = GENEVE_DF_UNSET, + .use_udp6_rx_checksums = true, + .ttl_inherit = false, + .collect_md = true, + }; + + memset(tb, 0, sizeof(tb)); + dev = rtnl_create_link(net, name, name_assign_type, + &geneve_link_ops, tb, NULL); + if (IS_ERR(dev)) + return dev; + + init_tnl_info(&cfg.info, dst_port); + err = geneve_configure(net, dev, NULL, &cfg); + if (err) { + free_netdev(dev); + return ERR_PTR(err); + } + + /* openvswitch users expect packet sizes to be unrestricted, + * so set the largest MTU we can. + */ + err = geneve_change_mtu(dev, IP_MAX_MTU); + if (err) + goto err; + + err = rtnl_configure_link(dev, NULL, 0, NULL); + if (err < 0) + goto err; + + return dev; +err: + geneve_dellink(dev, &list_kill); + unregister_netdevice_many(&list_kill); + return ERR_PTR(err); +} +EXPORT_SYMBOL_GPL(geneve_dev_create_fb); + +static int geneve_netdevice_event(struct notifier_block *unused, + unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) + geneve_offload_rx_ports(dev, true); + else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) + geneve_offload_rx_ports(dev, false); + + return NOTIFY_DONE; +} + +static struct notifier_block geneve_notifier_block __read_mostly = { + .notifier_call = geneve_netdevice_event, +}; + +static __net_init int geneve_init_net(struct net *net) +{ + struct geneve_net *gn = net_generic(net, geneve_net_id); + + INIT_LIST_HEAD(&gn->geneve_list); + INIT_LIST_HEAD(&gn->sock_list); + return 0; +} + +static void geneve_destroy_tunnels(struct net *net, struct list_head *head) +{ + struct geneve_net *gn = net_generic(net, geneve_net_id); + struct geneve_dev *geneve, *next; + struct net_device *dev, *aux; + + /* gather any geneve devices that were moved into this ns */ + for_each_netdev_safe(net, dev, aux) + if (dev->rtnl_link_ops == &geneve_link_ops) + unregister_netdevice_queue(dev, head); + + /* now gather any other geneve devices that were created in this ns */ + list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { + /* If geneve->dev is in the same netns, it was already added + * to the list by the previous loop. + */ + if (!net_eq(dev_net(geneve->dev), net)) + unregister_netdevice_queue(geneve->dev, head); + } +} + +static void __net_exit geneve_exit_batch_net(struct list_head *net_list) +{ + struct net *net; + LIST_HEAD(list); + + rtnl_lock(); + list_for_each_entry(net, net_list, exit_list) + geneve_destroy_tunnels(net, &list); + + /* unregister the devices gathered above */ + unregister_netdevice_many(&list); + rtnl_unlock(); + + list_for_each_entry(net, net_list, exit_list) { + const struct geneve_net *gn = net_generic(net, geneve_net_id); + + WARN_ON_ONCE(!list_empty(&gn->sock_list)); + } +} + +static struct pernet_operations geneve_net_ops = { + .init = geneve_init_net, + .exit_batch = geneve_exit_batch_net, + .id = &geneve_net_id, + .size = sizeof(struct geneve_net), +}; + +static int __init geneve_init_module(void) +{ + int rc; + + rc = register_pernet_subsys(&geneve_net_ops); + if (rc) + goto out1; + + rc = register_netdevice_notifier(&geneve_notifier_block); + if (rc) + goto out2; + + rc = rtnl_link_register(&geneve_link_ops); + if (rc) + goto out3; + + return 0; +out3: + unregister_netdevice_notifier(&geneve_notifier_block); +out2: + unregister_pernet_subsys(&geneve_net_ops); +out1: + return rc; +} +late_initcall(geneve_init_module); + +static void __exit geneve_cleanup_module(void) +{ + rtnl_link_unregister(&geneve_link_ops); + unregister_netdevice_notifier(&geneve_notifier_block); + unregister_pernet_subsys(&geneve_net_ops); +} +module_exit(geneve_cleanup_module); + +MODULE_LICENSE("GPL"); +MODULE_VERSION(GENEVE_NETDEV_VER); +MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); +MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); +MODULE_ALIAS_RTNL_LINK("geneve"); |