| /* |
| * GENEVE: Generic Network Virtualization Encapsulation |
| * |
| * Copyright (c) 2015 Red Hat, Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/hash.h> |
| #include <net/dst_metadata.h> |
| #include <net/gro_cells.h> |
| #include <net/rtnetlink.h> |
| #include <net/geneve.h> |
| #include <net/protocol.h> |
| |
| #define GENEVE_NETDEV_VER "0.6" |
| |
| #define GENEVE_UDP_PORT 6081 |
| |
| #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)) |
| |
| /* per-network namespace private data for this module */ |
| struct geneve_net { |
| struct list_head geneve_list; |
| struct list_head sock_list; |
| }; |
| |
| static int geneve_net_id; |
| |
| union geneve_addr { |
| struct sockaddr_in sin; |
| struct sockaddr_in6 sin6; |
| struct sockaddr sa; |
| }; |
| |
| static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, }; |
| |
| /* Pseudo network device */ |
| struct geneve_dev { |
| struct hlist_node hlist; /* vni hash table */ |
| struct net *net; /* netns for packet i/o */ |
| struct net_device *dev; /* netdev for geneve tunnel */ |
| struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */ |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */ |
| #endif |
| u8 vni[3]; /* virtual network ID for tunnel */ |
| u8 ttl; /* TTL override */ |
| u8 tos; /* TOS override */ |
| union geneve_addr remote; /* IP address for link partner */ |
| struct list_head next; /* geneve's per namespace list */ |
| __be32 label; /* IPv6 flowlabel override */ |
| __be16 dst_port; |
| bool collect_md; |
| struct gro_cells gro_cells; |
| u32 flags; |
| struct dst_cache dst_cache; |
| }; |
| |
| /* Geneve device flags */ |
| #define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0) |
| #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1) |
| #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2) |
| |
| 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]; |
| u32 flags; |
| }; |
| |
| 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 |
| } |
| |
| 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 *geneve; |
| __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(geneve, vni_list_head, hlist) { |
| if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && |
| addr == geneve->remote.sin.sin_addr.s_addr) |
| return 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 *geneve; |
| __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(geneve, vni_list_head, hlist) { |
| if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && |
| ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr)) |
| return 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) |
| { |
| u8 *vni; |
| __be32 addr; |
| static u8 zero_vni[3]; |
| #if IS_ENABLED(CONFIG_IPV6) |
| static struct in6_addr zero_addr6; |
| #endif |
| |
| if (geneve_get_sk_family(gs) == AF_INET) { |
| struct iphdr *iph; |
| |
| 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) { |
| 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; |
| struct pcpu_sw_netstats *stats; |
| int err = 0; |
| void *oiph; |
| |
| if (ip_tunnel_collect_metadata() || gs->collect_md) { |
| __be16 flags; |
| |
| flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | |
| (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) |
| 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); |
| } else { |
| /* Drop packets w/ critical options, |
| * since we don't support any... |
| */ |
| if (gnvh->critical) |
| goto drop; |
| } |
| |
| skb_reset_mac_header(skb); |
| skb->protocol = eth_type_trans(skb, geneve->dev); |
| skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| |
| if (tun_dst) |
| skb_dst_set(skb, &tun_dst->dst); |
| |
| /* Ignore packet loops (and multicast echo) */ |
| if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) |
| goto drop; |
| |
| 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; |
| } |
| } |
| |
| stats = this_cpu_ptr(geneve->dev->tstats); |
| u64_stats_update_begin(&stats->syncp); |
| stats->rx_packets++; |
| stats->rx_bytes += skb->len; |
| u64_stats_update_end(&stats->syncp); |
| |
| gro_cells_receive(&geneve->gro_cells, skb); |
| 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->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->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; |
| int opts_len; |
| |
| /* Need Geneve and inner Ethernet 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; |
| |
| if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) |
| goto drop; |
| |
| gs = rcu_dereference_sk_user_data(sk); |
| if (!gs) |
| goto drop; |
| |
| geneve = geneve_lookup_skb(gs, skb); |
| if (!geneve) |
| goto drop; |
| |
| opts_len = geneveh->opt_len * 4; |
| if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, |
| htons(ETH_P_TEB), |
| !net_eq(geneve->net, dev_net(geneve->dev)))) |
| goto drop; |
| |
| geneve_rx(geneve, gs, skb); |
| return 0; |
| |
| drop: |
| /* Consume bad packet */ |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static struct socket *geneve_create_sock(struct net *net, bool ipv6, |
| __be16 port, u32 flags) |
| { |
| 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 = |
| !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX); |
| } 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); |
| |
| return sock; |
| } |
| |
| static void geneve_notify_add_rx_port(struct geneve_sock *gs) |
| { |
| struct net_device *dev; |
| struct sock *sk = gs->sock->sk; |
| struct net *net = sock_net(sk); |
| sa_family_t sa_family = geneve_get_sk_family(gs); |
| __be16 port = inet_sk(sk)->inet_sport; |
| |
| rcu_read_lock(); |
| for_each_netdev_rcu(net, dev) { |
| if (dev->netdev_ops->ndo_add_geneve_port) |
| dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, |
| port); |
| } |
| rcu_read_unlock(); |
| } |
| |
| 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 sk_buff **head, |
| struct sk_buff *skb) |
| { |
| struct sk_buff *p, **pp = NULL; |
| 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_fast(skb, off_gnv); |
| if (skb_gro_header_hard(skb, hlen)) { |
| gh = skb_gro_header_slow(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; |
| } |
| |
| for (p = *head; p; p = p->next) { |
| 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; |
| } |
| } |
| |
| type = gh->proto_type; |
| |
| rcu_read_lock(); |
| ptype = gro_find_receive_by_type(type); |
| if (!ptype) |
| goto out_unlock; |
| |
| skb_gro_pull(skb, gh_len); |
| skb_gro_postpull_rcsum(skb, gh, gh_len); |
| pp = ptype->callbacks.gro_receive(head, skb); |
| flush = 0; |
| |
| out_unlock: |
| rcu_read_unlock(); |
| out: |
| NAPI_GRO_CB(skb)->flush |= 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; |
| |
| rcu_read_lock(); |
| ptype = gro_find_complete_by_type(type); |
| if (ptype) |
| err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); |
| |
| rcu_read_unlock(); |
| |
| 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, u32 flags) |
| { |
| 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, flags); |
| 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 */ |
| geneve_notify_add_rx_port(gs); |
| |
| /* 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_destroy = NULL; |
| setup_udp_tunnel_sock(net, sock, &tunnel_cfg); |
| list_add(&gs->list, &gn->sock_list); |
| return gs; |
| } |
| |
| static void geneve_notify_del_rx_port(struct geneve_sock *gs) |
| { |
| struct net_device *dev; |
| struct sock *sk = gs->sock->sk; |
| struct net *net = sock_net(sk); |
| sa_family_t sa_family = geneve_get_sk_family(gs); |
| __be16 port = inet_sk(sk)->inet_sport; |
| |
| rcu_read_lock(); |
| for_each_netdev_rcu(net, dev) { |
| if (dev->netdev_ops->ndo_del_geneve_port) |
| dev->netdev_ops->ndo_del_geneve_port(dev, sa_family, |
| port); |
| } |
| |
| rcu_read_unlock(); |
| } |
| |
| static void __geneve_sock_release(struct geneve_sock *gs) |
| { |
| if (!gs || --gs->refcnt) |
| return; |
| |
| list_del(&gs->list); |
| geneve_notify_del_rx_port(gs); |
| udp_tunnel_sock_release(gs->sock); |
| kfree_rcu(gs, rcu); |
| } |
| |
| static void geneve_sock_release(struct geneve_dev *geneve) |
| { |
| __geneve_sock_release(geneve->sock4); |
| #if IS_ENABLED(CONFIG_IPV6) |
| __geneve_sock_release(geneve->sock6); |
| #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_sock *gs; |
| __u32 hash; |
| |
| gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port); |
| if (gs) { |
| gs->refcnt++; |
| goto out; |
| } |
| |
| gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags); |
| if (IS_ERR(gs)) |
| return PTR_ERR(gs); |
| |
| out: |
| gs->collect_md = geneve->collect_md; |
| gs->flags = geneve->flags; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (ipv6) |
| geneve->sock6 = gs; |
| else |
| #endif |
| geneve->sock4 = gs; |
| |
| hash = geneve_net_vni_hash(geneve->vni); |
| hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]); |
| return 0; |
| } |
| |
| static int geneve_open(struct net_device *dev) |
| { |
| struct geneve_dev *geneve = netdev_priv(dev); |
| bool ipv6 = geneve->remote.sa.sa_family == AF_INET6; |
| bool metadata = geneve->collect_md; |
| int ret = 0; |
| |
| geneve->sock4 = NULL; |
| #if IS_ENABLED(CONFIG_IPV6) |
| geneve->sock6 = NULL; |
| if (ipv6 || metadata) |
| ret = geneve_sock_add(geneve, true); |
| #endif |
| if (!ret && (!ipv6 || metadata)) |
| 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); |
| |
| if (!hlist_unhashed(&geneve->hlist)) |
| hlist_del_rcu(&geneve->hlist); |
| geneve_sock_release(geneve); |
| return 0; |
| } |
| |
| static void geneve_build_header(struct genevehdr *geneveh, |
| __be16 tun_flags, u8 vni[3], |
| u8 options_len, u8 *options) |
| { |
| geneveh->ver = GENEVE_VER; |
| geneveh->opt_len = options_len / 4; |
| geneveh->oam = !!(tun_flags & TUNNEL_OAM); |
| geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); |
| geneveh->rsvd1 = 0; |
| memcpy(geneveh->vni, vni, 3); |
| geneveh->proto_type = htons(ETH_P_TEB); |
| geneveh->rsvd2 = 0; |
| |
| memcpy(geneveh->options, options, options_len); |
| } |
| |
| static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb, |
| __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, |
| u32 flags, bool xnet) |
| { |
| struct genevehdr *gnvh; |
| int min_headroom; |
| int err; |
| bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX); |
| |
| skb_scrub_packet(skb, xnet); |
| |
| min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len |
| + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr); |
| err = skb_cow_head(skb, min_headroom); |
| if (unlikely(err)) |
| goto free_rt; |
| |
| err = udp_tunnel_handle_offloads(skb, udp_sum); |
| if (err) |
| goto free_rt; |
| |
| gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); |
| geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); |
| |
| skb_set_inner_protocol(skb, htons(ETH_P_TEB)); |
| return 0; |
| |
| free_rt: |
| ip_rt_put(rt); |
| return err; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb, |
| __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, |
| u32 flags, bool xnet) |
| { |
| struct genevehdr *gnvh; |
| int min_headroom; |
| int err; |
| bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX); |
| |
| skb_scrub_packet(skb, xnet); |
| |
| min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len |
| + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr); |
| 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 = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); |
| geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); |
| |
| skb_set_inner_protocol(skb, htons(ETH_P_TEB)); |
| return 0; |
| |
| free_dst: |
| dst_release(dst); |
| return err; |
| } |
| #endif |
| |
| static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, |
| struct net_device *dev, |
| struct flowi4 *fl4, |
| struct ip_tunnel_info *info) |
| { |
| 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; |
| |
| memset(fl4, 0, sizeof(*fl4)); |
| fl4->flowi4_mark = skb->mark; |
| fl4->flowi4_proto = IPPROTO_UDP; |
| |
| if (info) { |
| fl4->daddr = info->key.u.ipv4.dst; |
| fl4->saddr = info->key.u.ipv4.src; |
| fl4->flowi4_tos = RT_TOS(info->key.tos); |
| dst_cache = &info->dst_cache; |
| } else { |
| tos = geneve->tos; |
| if (tos == 1) { |
| const struct iphdr *iip = ip_hdr(skb); |
| |
| tos = ip_tunnel_get_dsfield(iip, skb); |
| use_cache = false; |
| } |
| |
| fl4->flowi4_tos = RT_TOS(tos); |
| fl4->daddr = geneve->remote.sin.sin_addr.s_addr; |
| dst_cache = &geneve->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 flowi6 *fl6, |
| struct ip_tunnel_info *info) |
| { |
| bool use_cache = ip_tunnel_dst_cache_usable(skb, info); |
| struct geneve_dev *geneve = netdev_priv(dev); |
| struct geneve_sock *gs6 = geneve->sock6; |
| struct dst_entry *dst = NULL; |
| struct dst_cache *dst_cache; |
| __u8 prio; |
| |
| memset(fl6, 0, sizeof(*fl6)); |
| fl6->flowi6_mark = skb->mark; |
| fl6->flowi6_proto = IPPROTO_UDP; |
| |
| if (info) { |
| fl6->daddr = info->key.u.ipv6.dst; |
| fl6->saddr = info->key.u.ipv6.src; |
| fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos), |
| info->key.label); |
| dst_cache = &info->dst_cache; |
| } else { |
| prio = geneve->tos; |
| if (prio == 1) { |
| const struct iphdr *iip = ip_hdr(skb); |
| |
| prio = ip_tunnel_get_dsfield(iip, skb); |
| use_cache = false; |
| } |
| |
| fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), |
| geneve->label); |
| fl6->daddr = geneve->remote.sin6.sin6_addr; |
| dst_cache = &geneve->dst_cache; |
| } |
| |
| if (use_cache) { |
| dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); |
| if (dst) |
| return dst; |
| } |
| |
| if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) { |
| 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 |
| |
| /* 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 netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, |
| struct ip_tunnel_info *info) |
| { |
| struct geneve_dev *geneve = netdev_priv(dev); |
| struct geneve_sock *gs4 = geneve->sock4; |
| struct rtable *rt = NULL; |
| const struct iphdr *iip; /* interior IP header */ |
| int err = -EINVAL; |
| struct flowi4 fl4; |
| __u8 tos, ttl; |
| __be16 sport; |
| __be16 df; |
| bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); |
| u32 flags = geneve->flags; |
| |
| if (geneve->collect_md) { |
| if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { |
| netdev_dbg(dev, "no tunnel metadata\n"); |
| goto tx_error; |
| } |
| if (info && ip_tunnel_info_af(info) != AF_INET) |
| goto tx_error; |
| } |
| |
| rt = geneve_get_v4_rt(skb, dev, &fl4, info); |
| if (IS_ERR(rt)) { |
| err = PTR_ERR(rt); |
| goto tx_error; |
| } |
| |
| sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); |
| skb_reset_mac_header(skb); |
| |
| iip = ip_hdr(skb); |
| |
| if (info) { |
| const struct ip_tunnel_key *key = &info->key; |
| u8 *opts = NULL; |
| u8 vni[3]; |
| |
| tunnel_id_to_vni(key->tun_id, vni); |
| if (info->options_len) |
| opts = ip_tunnel_info_opts(info); |
| |
| if (key->tun_flags & TUNNEL_CSUM) |
| flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX; |
| else |
| flags |= GENEVE_F_UDP_ZERO_CSUM_TX; |
| |
| err = geneve_build_skb(rt, skb, key->tun_flags, vni, |
| info->options_len, opts, flags, xnet); |
| if (unlikely(err)) |
| goto tx_error; |
| |
| tos = ip_tunnel_ecn_encap(key->tos, iip, skb); |
| ttl = key->ttl; |
| df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
| } else { |
| err = geneve_build_skb(rt, skb, 0, geneve->vni, |
| 0, NULL, flags, xnet); |
| if (unlikely(err)) |
| goto tx_error; |
| |
| tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); |
| ttl = geneve->ttl; |
| if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) |
| ttl = 1; |
| ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
| df = 0; |
| } |
| udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, |
| tos, ttl, df, sport, geneve->dst_port, |
| !net_eq(geneve->net, dev_net(geneve->dev)), |
| !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX)); |
| |
| return NETDEV_TX_OK; |
| |
| tx_error: |
| dev_kfree_skb(skb); |
| |
| if (err == -ELOOP) |
| dev->stats.collisions++; |
| else if (err == -ENETUNREACH) |
| dev->stats.tx_carrier_errors++; |
| else |
| dev->stats.tx_errors++; |
| return NETDEV_TX_OK; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, |
| struct ip_tunnel_info *info) |
| { |
| struct geneve_dev *geneve = netdev_priv(dev); |
| struct geneve_sock *gs6 = geneve->sock6; |
| struct dst_entry *dst = NULL; |
| const struct iphdr *iip; /* interior IP header */ |
| int err = -EINVAL; |
| struct flowi6 fl6; |
| __u8 prio, ttl; |
| __be16 sport; |
| __be32 label; |
| bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); |
| u32 flags = geneve->flags; |
| |
| if (geneve->collect_md) { |
| if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { |
| netdev_dbg(dev, "no tunnel metadata\n"); |
| goto tx_error; |
| } |
| } |
| |
| dst = geneve_get_v6_dst(skb, dev, &fl6, info); |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| goto tx_error; |
| } |
| |
| sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); |
| skb_reset_mac_header(skb); |
| |
| iip = ip_hdr(skb); |
| |
| if (info) { |
| const struct ip_tunnel_key *key = &info->key; |
| u8 *opts = NULL; |
| u8 vni[3]; |
| |
| tunnel_id_to_vni(key->tun_id, vni); |
| if (info->options_len) |
| opts = ip_tunnel_info_opts(info); |
| |
| if (key->tun_flags & TUNNEL_CSUM) |
| flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX; |
| else |
| flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; |
| |
| err = geneve6_build_skb(dst, skb, key->tun_flags, vni, |
| info->options_len, opts, |
| flags, xnet); |
| if (unlikely(err)) |
| goto tx_error; |
| |
| prio = ip_tunnel_ecn_encap(key->tos, iip, skb); |
| ttl = key->ttl; |
| label = info->key.label; |
| } else { |
| err = geneve6_build_skb(dst, skb, 0, geneve->vni, |
| 0, NULL, flags, xnet); |
| if (unlikely(err)) |
| goto tx_error; |
| |
| prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), |
| iip, skb); |
| ttl = geneve->ttl; |
| if (!ttl && ipv6_addr_is_multicast(&fl6.daddr)) |
| ttl = 1; |
| ttl = ttl ? : ip6_dst_hoplimit(dst); |
| label = geneve->label; |
| } |
| |
| udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, |
| &fl6.saddr, &fl6.daddr, prio, ttl, label, |
| sport, geneve->dst_port, |
| !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX)); |
| return NETDEV_TX_OK; |
| |
| tx_error: |
| dev_kfree_skb(skb); |
| |
| if (err == -ELOOP) |
| dev->stats.collisions++; |
| else if (err == -ENETUNREACH) |
| dev->stats.tx_carrier_errors++; |
| else |
| dev->stats.tx_errors++; |
| return NETDEV_TX_OK; |
| } |
| #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; |
| |
| if (geneve->collect_md) |
| info = skb_tunnel_info(skb); |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if ((info && ip_tunnel_info_af(info) == AF_INET6) || |
| (!info && geneve->remote.sa.sa_family == AF_INET6)) |
| return geneve6_xmit_skb(skb, dev, info); |
| #endif |
| return geneve_xmit_skb(skb, dev, info); |
| } |
| |
| static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
| { |
| /* The max_mtu calculation does not take account of GENEVE |
| * options, to avoid excluding potentially valid |
| * configurations. |
| */ |
| int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr) |
| - dev->hard_header_len; |
| |
| if (new_mtu < 68) |
| return -EINVAL; |
| |
| if (new_mtu > max_mtu) { |
| if (strict) |
| return -EINVAL; |
| |
| new_mtu = max_mtu; |
| } |
| |
| dev->mtu = new_mtu; |
| return 0; |
| } |
| |
| static int geneve_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| return __geneve_change_mtu(dev, new_mtu, true); |
| } |
| |
| 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); |
| struct rtable *rt; |
| struct flowi4 fl4; |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct dst_entry *dst; |
| struct flowi6 fl6; |
| #endif |
| |
| if (ip_tunnel_info_af(info) == AF_INET) { |
| rt = geneve_get_v4_rt(skb, dev, &fl4, info); |
| 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) { |
| dst = geneve_get_v6_dst(skb, dev, &fl6, info); |
| 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 = udp_flow_src_port(geneve->net, skb, |
| 1, USHRT_MAX, true); |
| info->key.tp_dst = geneve->dst_port; |
| 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 = ip_tunnel_get_stats64, |
| .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) |
| { |
| strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); |
| strlcpy(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_add_geneve_port of the caller in order to |
| * supply the listening GENEVE udp ports. Callers are expected |
| * to implement the ndo_add_geneve_port. |
| */ |
| static void geneve_push_rx_ports(struct net_device *dev) |
| { |
| struct net *net = dev_net(dev); |
| struct geneve_net *gn = net_generic(net, geneve_net_id); |
| struct geneve_sock *gs; |
| sa_family_t sa_family; |
| struct sock *sk; |
| __be16 port; |
| |
| if (!dev->netdev_ops->ndo_add_geneve_port) |
| return; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(gs, &gn->sock_list, list) { |
| sk = gs->sock->sk; |
| sa_family = sk->sk_family; |
| port = inet_sk(sk)->inet_sport; |
| dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port); |
| } |
| 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->destructor = free_netdev; |
| |
| SET_NETDEV_DEVTYPE(dev, &geneve_type); |
| |
| dev->features |= NETIF_F_LLTX; |
| dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
| dev->features |= NETIF_F_RXCSUM; |
| dev->features |= NETIF_F_GSO_SOFTWARE; |
| |
| dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; |
| dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
| |
| 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_ID] = { .type = NLA_U32 }, |
| [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(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 }, |
| }; |
| |
| static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) |
| { |
| if (tb[IFLA_ADDRESS]) { |
| if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| return -EINVAL; |
| |
| if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| return -EADDRNOTAVAIL; |
| } |
| |
| if (!data) |
| return -EINVAL; |
| |
| if (data[IFLA_GENEVE_ID]) { |
| __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| |
| if (vni >= GENEVE_VID_MASK) |
| return -ERANGE; |
| } |
| |
| return 0; |
| } |
| |
| static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, |
| __be16 dst_port, |
| union geneve_addr *remote, |
| u8 vni[], |
| bool *tun_on_same_port, |
| bool *tun_collect_md) |
| { |
| struct geneve_dev *geneve, *t; |
| |
| *tun_on_same_port = false; |
| *tun_collect_md = false; |
| t = NULL; |
| list_for_each_entry(geneve, &gn->geneve_list, next) { |
| if (geneve->dst_port == dst_port) { |
| *tun_collect_md = geneve->collect_md; |
| *tun_on_same_port = true; |
| } |
| if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && |
| !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) && |
| dst_port == geneve->dst_port) |
| t = geneve; |
| } |
| return t; |
| } |
| |
| static int geneve_configure(struct net *net, struct net_device *dev, |
| union geneve_addr *remote, |
| __u32 vni, __u8 ttl, __u8 tos, __be32 label, |
| __be16 dst_port, bool metadata, u32 flags) |
| { |
| struct geneve_net *gn = net_generic(net, geneve_net_id); |
| struct geneve_dev *t, *geneve = netdev_priv(dev); |
| bool tun_collect_md, tun_on_same_port; |
| int err, encap_len; |
| |
| if (!remote) |
| return -EINVAL; |
| if (metadata && |
| (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label)) |
| return -EINVAL; |
| |
| geneve->net = net; |
| geneve->dev = dev; |
| |
| geneve->vni[0] = (vni & 0x00ff0000) >> 16; |
| geneve->vni[1] = (vni & 0x0000ff00) >> 8; |
| geneve->vni[2] = vni & 0x000000ff; |
| |
| if ((remote->sa.sa_family == AF_INET && |
| IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) || |
| (remote->sa.sa_family == AF_INET6 && |
| ipv6_addr_is_multicast(&remote->sin6.sin6_addr))) |
| return -EINVAL; |
| if (label && remote->sa.sa_family != AF_INET6) |
| return -EINVAL; |
| |
| geneve->remote = *remote; |
| |
| geneve->ttl = ttl; |
| geneve->tos = tos; |
| geneve->label = label; |
| geneve->dst_port = dst_port; |
| geneve->collect_md = metadata; |
| geneve->flags = flags; |
| |
| t = geneve_find_dev(gn, dst_port, remote, geneve->vni, |
| &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 (remote->sa.sa_family == AF_INET) |
| encap_len += sizeof(struct iphdr); |
| else |
| encap_len += sizeof(struct ipv6hdr); |
| dev->needed_headroom = encap_len + ETH_HLEN; |
| |
| if (metadata) { |
| if (tun_on_same_port) |
| return -EPERM; |
| } else { |
| if (tun_collect_md) |
| return -EPERM; |
| } |
| |
| dst_cache_reset(&geneve->dst_cache); |
| |
| err = register_netdevice(dev); |
| if (err) |
| return err; |
| |
| list_add(&geneve->next, &gn->geneve_list); |
| return 0; |
| } |
| |
| static int geneve_newlink(struct net *net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[]) |
| { |
| __be16 dst_port = htons(GENEVE_UDP_PORT); |
| __u8 ttl = 0, tos = 0; |
| bool metadata = false; |
| union geneve_addr remote = geneve_remote_unspec; |
| __be32 label = 0; |
| __u32 vni = 0; |
| u32 flags = 0; |
| |
| if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) |
| return -EINVAL; |
| |
| if (data[IFLA_GENEVE_REMOTE]) { |
| remote.sa.sa_family = AF_INET; |
| remote.sin.sin_addr.s_addr = |
| nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); |
| } |
| |
| if (data[IFLA_GENEVE_REMOTE6]) { |
| if (!IS_ENABLED(CONFIG_IPV6)) |
| return -EPFNOSUPPORT; |
| |
| remote.sa.sa_family = AF_INET6; |
| remote.sin6.sin6_addr = |
| nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); |
| |
| if (ipv6_addr_type(&remote.sin6.sin6_addr) & |
| IPV6_ADDR_LINKLOCAL) { |
| netdev_dbg(dev, "link-local remote is unsupported\n"); |
| return -EINVAL; |
| } |
| } |
| |
| if (data[IFLA_GENEVE_ID]) |
| vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
| |
| if (data[IFLA_GENEVE_TTL]) |
| ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); |
| |
| if (data[IFLA_GENEVE_TOS]) |
| tos = nla_get_u8(data[IFLA_GENEVE_TOS]); |
| |
| if (data[IFLA_GENEVE_LABEL]) |
| label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & |
| IPV6_FLOWLABEL_MASK; |
| |
| if (data[IFLA_GENEVE_PORT]) |
| dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]); |
| |
| if (data[IFLA_GENEVE_COLLECT_METADATA]) |
| metadata = true; |
| |
| if (data[IFLA_GENEVE_UDP_CSUM] && |
| !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) |
| flags |= GENEVE_F_UDP_ZERO_CSUM_TX; |
| |
| if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] && |
| nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) |
| flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; |
| |
| if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] && |
| nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) |
| flags |= GENEVE_F_UDP_ZERO_CSUM6_RX; |
| |
| return geneve_configure(net, dev, &remote, vni, ttl, tos, label, |
| dst_port, metadata, flags); |
| } |
| |
| 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(__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 */ |
| 0; |
| } |
| |
| static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| { |
| struct geneve_dev *geneve = netdev_priv(dev); |
| __u32 vni; |
| |
| vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2]; |
| if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) |
| goto nla_put_failure; |
| |
| if (geneve->remote.sa.sa_family == AF_INET) { |
| if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, |
| geneve->remote.sin.sin_addr.s_addr)) |
| goto nla_put_failure; |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, |
| &geneve->remote.sin6.sin6_addr)) |
| goto nla_put_failure; |
| #endif |
| } |
| |
| if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) || |
| nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) || |
| nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label)) |
| goto nla_put_failure; |
| |
| if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port)) |
| goto nla_put_failure; |
| |
| if (geneve->collect_md) { |
| if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) |
| goto nla_put_failure; |
| } |
| |
| if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, |
| !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) || |
| nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, |
| !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) || |
| nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, |
| !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX))) |
| 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, |
| .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; |
| |
| memset(tb, 0, sizeof(tb)); |
| dev = rtnl_create_link(net, name, name_assign_type, |
| &geneve_link_ops, tb); |
| if (IS_ERR(dev)) |
| return dev; |
| |
| err = geneve_configure(net, dev, &geneve_remote_unspec, |
| 0, 0, 0, 0, htons(dst_port), true, |
| GENEVE_F_UDP_ZERO_CSUM6_RX); |
| 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, false); |
| if (err) |
| goto err; |
| |
| err = rtnl_configure_link(dev, 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_OFFLOAD_PUSH_GENEVE) |
| geneve_push_rx_ports(dev); |
| |
| 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 __net_exit geneve_exit_net(struct net *net) |
| { |
| struct geneve_net *gn = net_generic(net, geneve_net_id); |
| struct geneve_dev *geneve, *next; |
| struct net_device *dev, *aux; |
| LIST_HEAD(list); |
| |
| rtnl_lock(); |
| |
| /* 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, &list); |
| |
| /* 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, &list); |
| } |
| |
| /* unregister the devices gathered above */ |
| unregister_netdevice_many(&list); |
| rtnl_unlock(); |
| } |
| |
| static struct pernet_operations geneve_net_ops = { |
| .init = geneve_init_net, |
| .exit = geneve_exit_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"); |