| /* |
| * VXLAN: Virtual eXtensible Local Area Network |
| * |
| * Copyright (c) 2012-2013 Vyatta 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/types.h> |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/skbuff.h> |
| #include <linux/rculist.h> |
| #include <linux/netdevice.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| #include <linux/udp.h> |
| #include <linux/igmp.h> |
| #include <linux/etherdevice.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_vlan.h> |
| #include <linux/hash.h> |
| #include <linux/ethtool.h> |
| #include <net/arp.h> |
| #include <net/ndisc.h> |
| #include <net/ip.h> |
| #include <net/ip_tunnels.h> |
| #include <net/icmp.h> |
| #include <net/udp.h> |
| #include <net/udp_tunnel.h> |
| #include <net/rtnetlink.h> |
| #include <net/route.h> |
| #include <net/dsfield.h> |
| #include <net/inet_ecn.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| #include <net/vxlan.h> |
| #include <net/protocol.h> |
| #include <net/udp_tunnel.h> |
| #if IS_ENABLED(CONFIG_IPV6) |
| #include <net/ipv6.h> |
| #include <net/addrconf.h> |
| #include <net/ip6_tunnel.h> |
| #include <net/ip6_checksum.h> |
| #endif |
| #include <net/dst_metadata.h> |
| |
| #define VXLAN_VERSION "0.1" |
| |
| #define PORT_HASH_BITS 8 |
| #define PORT_HASH_SIZE (1<<PORT_HASH_BITS) |
| #define FDB_AGE_DEFAULT 300 /* 5 min */ |
| #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ |
| |
| /* UDP port for VXLAN traffic. |
| * The IANA assigned port is 4789, but the Linux default is 8472 |
| * for compatibility with early adopters. |
| */ |
| static unsigned short vxlan_port __read_mostly = 8472; |
| module_param_named(udp_port, vxlan_port, ushort, 0444); |
| MODULE_PARM_DESC(udp_port, "Destination UDP port"); |
| |
| 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"); |
| |
| static int vxlan_net_id; |
| static struct rtnl_link_ops vxlan_link_ops; |
| |
| static const u8 all_zeros_mac[ETH_ALEN]; |
| |
| static int vxlan_sock_add(struct vxlan_dev *vxlan); |
| |
| /* per-network namespace private data for this module */ |
| struct vxlan_net { |
| struct list_head vxlan_list; |
| struct hlist_head sock_list[PORT_HASH_SIZE]; |
| spinlock_t sock_lock; |
| }; |
| |
| /* Forwarding table entry */ |
| struct vxlan_fdb { |
| struct hlist_node hlist; /* linked list of entries */ |
| struct rcu_head rcu; |
| unsigned long updated; /* jiffies */ |
| unsigned long used; |
| struct list_head remotes; |
| u8 eth_addr[ETH_ALEN]; |
| u16 state; /* see ndm_state */ |
| u8 flags; /* see ndm_flags */ |
| }; |
| |
| /* salt for hash table */ |
| static u32 vxlan_salt __read_mostly; |
| static struct workqueue_struct *vxlan_wq; |
| |
| static inline bool vxlan_collect_metadata(struct vxlan_sock *vs) |
| { |
| return vs->flags & VXLAN_F_COLLECT_METADATA || |
| ip_tunnel_collect_metadata(); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static inline |
| bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) |
| { |
| if (a->sa.sa_family != b->sa.sa_family) |
| return false; |
| if (a->sa.sa_family == AF_INET6) |
| return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr); |
| else |
| return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; |
| } |
| |
| static inline bool vxlan_addr_any(const union vxlan_addr *ipa) |
| { |
| if (ipa->sa.sa_family == AF_INET6) |
| return ipv6_addr_any(&ipa->sin6.sin6_addr); |
| else |
| return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); |
| } |
| |
| static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa) |
| { |
| if (ipa->sa.sa_family == AF_INET6) |
| return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr); |
| else |
| return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr)); |
| } |
| |
| static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) |
| { |
| if (nla_len(nla) >= sizeof(struct in6_addr)) { |
| ip->sin6.sin6_addr = nla_get_in6_addr(nla); |
| ip->sa.sa_family = AF_INET6; |
| return 0; |
| } else if (nla_len(nla) >= sizeof(__be32)) { |
| ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); |
| ip->sa.sa_family = AF_INET; |
| return 0; |
| } else { |
| return -EAFNOSUPPORT; |
| } |
| } |
| |
| static int vxlan_nla_put_addr(struct sk_buff *skb, int attr, |
| const union vxlan_addr *ip) |
| { |
| if (ip->sa.sa_family == AF_INET6) |
| return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr); |
| else |
| return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); |
| } |
| |
| #else /* !CONFIG_IPV6 */ |
| |
| static inline |
| bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) |
| { |
| return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; |
| } |
| |
| static inline bool vxlan_addr_any(const union vxlan_addr *ipa) |
| { |
| return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); |
| } |
| |
| static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa) |
| { |
| return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr)); |
| } |
| |
| static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) |
| { |
| if (nla_len(nla) >= sizeof(struct in6_addr)) { |
| return -EAFNOSUPPORT; |
| } else if (nla_len(nla) >= sizeof(__be32)) { |
| ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); |
| ip->sa.sa_family = AF_INET; |
| return 0; |
| } else { |
| return -EAFNOSUPPORT; |
| } |
| } |
| |
| static int vxlan_nla_put_addr(struct sk_buff *skb, int attr, |
| const union vxlan_addr *ip) |
| { |
| return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); |
| } |
| #endif |
| |
| /* Virtual Network hash table head */ |
| static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id) |
| { |
| return &vs->vni_list[hash_32(id, VNI_HASH_BITS)]; |
| } |
| |
| /* Socket hash table head */ |
| static inline struct hlist_head *vs_head(struct net *net, __be16 port) |
| { |
| struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
| |
| return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)]; |
| } |
| |
| /* First remote destination for a forwarding entry. |
| * Guaranteed to be non-NULL because remotes are never deleted. |
| */ |
| static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb) |
| { |
| return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list); |
| } |
| |
| static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb) |
| { |
| return list_first_entry(&fdb->remotes, struct vxlan_rdst, list); |
| } |
| |
| /* Find VXLAN socket based on network namespace, address family and UDP port |
| * and enabled unshareable flags. |
| */ |
| static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, |
| __be16 port, u32 flags) |
| { |
| struct vxlan_sock *vs; |
| |
| flags &= VXLAN_F_RCV_FLAGS; |
| |
| hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { |
| if (inet_sk(vs->sock->sk)->inet_sport == port && |
| vxlan_get_sk_family(vs) == family && |
| vs->flags == flags) |
| return vs; |
| } |
| return NULL; |
| } |
| |
| static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id) |
| { |
| struct vxlan_dev *vxlan; |
| |
| hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) { |
| if (vxlan->default_dst.remote_vni == id) |
| return vxlan; |
| } |
| |
| return NULL; |
| } |
| |
| /* Look up VNI in a per net namespace table */ |
| static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, |
| sa_family_t family, __be16 port, |
| u32 flags) |
| { |
| struct vxlan_sock *vs; |
| |
| vs = vxlan_find_sock(net, family, port, flags); |
| if (!vs) |
| return NULL; |
| |
| return vxlan_vs_find_vni(vs, id); |
| } |
| |
| /* Fill in neighbour message in skbuff. */ |
| static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, |
| const struct vxlan_fdb *fdb, |
| u32 portid, u32 seq, int type, unsigned int flags, |
| const struct vxlan_rdst *rdst) |
| { |
| unsigned long now = jiffies; |
| struct nda_cacheinfo ci; |
| struct nlmsghdr *nlh; |
| struct ndmsg *ndm; |
| bool send_ip, send_eth; |
| |
| nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); |
| if (nlh == NULL) |
| return -EMSGSIZE; |
| |
| ndm = nlmsg_data(nlh); |
| memset(ndm, 0, sizeof(*ndm)); |
| |
| send_eth = send_ip = true; |
| |
| if (type == RTM_GETNEIGH) { |
| ndm->ndm_family = AF_INET; |
| send_ip = !vxlan_addr_any(&rdst->remote_ip); |
| send_eth = !is_zero_ether_addr(fdb->eth_addr); |
| } else |
| ndm->ndm_family = AF_BRIDGE; |
| ndm->ndm_state = fdb->state; |
| ndm->ndm_ifindex = vxlan->dev->ifindex; |
| ndm->ndm_flags = fdb->flags; |
| ndm->ndm_type = RTN_UNICAST; |
| |
| if (!net_eq(dev_net(vxlan->dev), vxlan->net) && |
| nla_put_s32(skb, NDA_LINK_NETNSID, |
| peernet2id_alloc(dev_net(vxlan->dev), vxlan->net))) |
| goto nla_put_failure; |
| |
| if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
| goto nla_put_failure; |
| |
| if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip)) |
| goto nla_put_failure; |
| |
| if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port && |
| nla_put_be16(skb, NDA_PORT, rdst->remote_port)) |
| goto nla_put_failure; |
| if (rdst->remote_vni != vxlan->default_dst.remote_vni && |
| nla_put_u32(skb, NDA_VNI, rdst->remote_vni)) |
| goto nla_put_failure; |
| if (rdst->remote_ifindex && |
| nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) |
| goto nla_put_failure; |
| |
| ci.ndm_used = jiffies_to_clock_t(now - fdb->used); |
| ci.ndm_confirmed = 0; |
| ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); |
| ci.ndm_refcnt = 0; |
| |
| if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
| goto nla_put_failure; |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| nla_put_failure: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| static inline size_t vxlan_nlmsg_size(void) |
| { |
| return NLMSG_ALIGN(sizeof(struct ndmsg)) |
| + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ |
| + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ |
| + nla_total_size(sizeof(__be16)) /* NDA_PORT */ |
| + nla_total_size(sizeof(__be32)) /* NDA_VNI */ |
| + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ |
| + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */ |
| + nla_total_size(sizeof(struct nda_cacheinfo)); |
| } |
| |
| static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, |
| struct vxlan_rdst *rd, int type) |
| { |
| struct net *net = dev_net(vxlan->dev); |
| struct sk_buff *skb; |
| int err = -ENOBUFS; |
| |
| skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); |
| if (skb == NULL) |
| goto errout; |
| |
| err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout; |
| } |
| |
| rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
| return; |
| errout: |
| if (err < 0) |
| rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
| } |
| |
| static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_fdb f = { |
| .state = NUD_STALE, |
| }; |
| struct vxlan_rdst remote = { |
| .remote_ip = *ipa, /* goes to NDA_DST */ |
| .remote_vni = VXLAN_N_VID, |
| }; |
| |
| vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH); |
| } |
| |
| static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) |
| { |
| struct vxlan_fdb f = { |
| .state = NUD_STALE, |
| }; |
| struct vxlan_rdst remote = { }; |
| |
| memcpy(f.eth_addr, eth_addr, ETH_ALEN); |
| |
| vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH); |
| } |
| |
| /* Hash Ethernet address */ |
| static u32 eth_hash(const unsigned char *addr) |
| { |
| u64 value = get_unaligned((u64 *)addr); |
| |
| /* only want 6 bytes */ |
| #ifdef __BIG_ENDIAN |
| value >>= 16; |
| #else |
| value <<= 16; |
| #endif |
| return hash_64(value, FDB_HASH_BITS); |
| } |
| |
| /* Hash chain to use given mac address */ |
| static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, |
| const u8 *mac) |
| { |
| return &vxlan->fdb_head[eth_hash(mac)]; |
| } |
| |
| /* Look up Ethernet address in forwarding table */ |
| static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, |
| const u8 *mac) |
| { |
| struct hlist_head *head = vxlan_fdb_head(vxlan, mac); |
| struct vxlan_fdb *f; |
| |
| hlist_for_each_entry_rcu(f, head, hlist) { |
| if (ether_addr_equal(mac, f->eth_addr)) |
| return f; |
| } |
| |
| return NULL; |
| } |
| |
| static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, |
| const u8 *mac) |
| { |
| struct vxlan_fdb *f; |
| |
| f = __vxlan_find_mac(vxlan, mac); |
| if (f) |
| f->used = jiffies; |
| |
| return f; |
| } |
| |
| /* caller should hold vxlan->hash_lock */ |
| static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, |
| union vxlan_addr *ip, __be16 port, |
| __u32 vni, __u32 ifindex) |
| { |
| struct vxlan_rdst *rd; |
| |
| list_for_each_entry(rd, &f->remotes, list) { |
| if (vxlan_addr_equal(&rd->remote_ip, ip) && |
| rd->remote_port == port && |
| rd->remote_vni == vni && |
| rd->remote_ifindex == ifindex) |
| return rd; |
| } |
| |
| return NULL; |
| } |
| |
| /* Replace destination of unicast mac */ |
| static int vxlan_fdb_replace(struct vxlan_fdb *f, |
| union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex) |
| { |
| struct vxlan_rdst *rd; |
| |
| rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); |
| if (rd) |
| return 0; |
| |
| rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); |
| if (!rd) |
| return 0; |
| rd->remote_ip = *ip; |
| rd->remote_port = port; |
| rd->remote_vni = vni; |
| rd->remote_ifindex = ifindex; |
| return 1; |
| } |
| |
| /* Add/update destinations for multicast */ |
| static int vxlan_fdb_append(struct vxlan_fdb *f, |
| union vxlan_addr *ip, __be16 port, __u32 vni, |
| __u32 ifindex, struct vxlan_rdst **rdp) |
| { |
| struct vxlan_rdst *rd; |
| |
| rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); |
| if (rd) |
| return 0; |
| |
| rd = kmalloc(sizeof(*rd), GFP_ATOMIC); |
| if (rd == NULL) |
| return -ENOBUFS; |
| rd->remote_ip = *ip; |
| rd->remote_port = port; |
| rd->remote_vni = vni; |
| rd->remote_ifindex = ifindex; |
| |
| list_add_tail_rcu(&rd->list, &f->remotes); |
| |
| *rdp = rd; |
| return 1; |
| } |
| |
| static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, |
| unsigned int off, |
| struct vxlanhdr *vh, size_t hdrlen, |
| u32 data, struct gro_remcsum *grc, |
| bool nopartial) |
| { |
| size_t start, offset; |
| |
| if (skb->remcsum_offload) |
| return vh; |
| |
| if (!NAPI_GRO_CB(skb)->csum_valid) |
| return NULL; |
| |
| start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT; |
| offset = start + ((data & VXLAN_RCO_UDP) ? |
| offsetof(struct udphdr, check) : |
| offsetof(struct tcphdr, check)); |
| |
| vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, |
| start, offset, grc, nopartial); |
| |
| skb->remcsum_offload = 1; |
| |
| return vh; |
| } |
| |
| static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, |
| struct sk_buff *skb, |
| struct udp_offload *uoff) |
| { |
| struct sk_buff *p, **pp = NULL; |
| struct vxlanhdr *vh, *vh2; |
| unsigned int hlen, off_vx; |
| int flush = 1; |
| struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock, |
| udp_offloads); |
| u32 flags; |
| struct gro_remcsum grc; |
| |
| skb_gro_remcsum_init(&grc); |
| |
| off_vx = skb_gro_offset(skb); |
| hlen = off_vx + sizeof(*vh); |
| vh = skb_gro_header_fast(skb, off_vx); |
| if (skb_gro_header_hard(skb, hlen)) { |
| vh = skb_gro_header_slow(skb, hlen, off_vx); |
| if (unlikely(!vh)) |
| goto out; |
| } |
| |
| skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); |
| |
| flags = ntohl(vh->vx_flags); |
| |
| if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { |
| vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), |
| ntohl(vh->vx_vni), &grc, |
| !!(vs->flags & |
| VXLAN_F_REMCSUM_NOPARTIAL)); |
| |
| if (!vh) |
| goto out; |
| } |
| |
| skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ |
| |
| flush = 0; |
| |
| for (p = *head; p; p = p->next) { |
| if (!NAPI_GRO_CB(p)->same_flow) |
| continue; |
| |
| vh2 = (struct vxlanhdr *)(p->data + off_vx); |
| if (vh->vx_flags != vh2->vx_flags || |
| vh->vx_vni != vh2->vx_vni) { |
| NAPI_GRO_CB(p)->same_flow = 0; |
| continue; |
| } |
| } |
| |
| pp = call_gro_receive(eth_gro_receive, head, skb); |
| |
| out: |
| skb_gro_remcsum_cleanup(skb, &grc); |
| NAPI_GRO_CB(skb)->flush |= flush; |
| |
| return pp; |
| } |
| |
| static int vxlan_gro_complete(struct sk_buff *skb, int nhoff, |
| struct udp_offload *uoff) |
| { |
| udp_tunnel_gro_complete(skb, nhoff); |
| |
| return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); |
| } |
| |
| /* Notify netdevs that UDP port started listening */ |
| static void vxlan_notify_add_rx_port(struct vxlan_sock *vs) |
| { |
| struct net_device *dev; |
| struct sock *sk = vs->sock->sk; |
| struct net *net = sock_net(sk); |
| sa_family_t sa_family = vxlan_get_sk_family(vs); |
| __be16 port = inet_sk(sk)->inet_sport; |
| int err; |
| |
| if (sa_family == AF_INET) { |
| err = udp_add_offload(&vs->udp_offloads); |
| if (err) |
| pr_warn("vxlan: udp_add_offload failed with status %d\n", err); |
| } |
| |
| rcu_read_lock(); |
| for_each_netdev_rcu(net, dev) { |
| if (dev->netdev_ops->ndo_add_vxlan_port) |
| dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family, |
| port); |
| } |
| rcu_read_unlock(); |
| } |
| |
| /* Notify netdevs that UDP port is no more listening */ |
| static void vxlan_notify_del_rx_port(struct vxlan_sock *vs) |
| { |
| struct net_device *dev; |
| struct sock *sk = vs->sock->sk; |
| struct net *net = sock_net(sk); |
| sa_family_t sa_family = vxlan_get_sk_family(vs); |
| __be16 port = inet_sk(sk)->inet_sport; |
| |
| rcu_read_lock(); |
| for_each_netdev_rcu(net, dev) { |
| if (dev->netdev_ops->ndo_del_vxlan_port) |
| dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family, |
| port); |
| } |
| rcu_read_unlock(); |
| |
| if (sa_family == AF_INET) |
| udp_del_offload(&vs->udp_offloads); |
| } |
| |
| /* Add new entry to forwarding table -- assumes lock held */ |
| static int vxlan_fdb_create(struct vxlan_dev *vxlan, |
| const u8 *mac, union vxlan_addr *ip, |
| __u16 state, __u16 flags, |
| __be16 port, __u32 vni, __u32 ifindex, |
| __u8 ndm_flags) |
| { |
| struct vxlan_rdst *rd = NULL; |
| struct vxlan_fdb *f; |
| int notify = 0; |
| |
| f = __vxlan_find_mac(vxlan, mac); |
| if (f) { |
| if (flags & NLM_F_EXCL) { |
| netdev_dbg(vxlan->dev, |
| "lost race to create %pM\n", mac); |
| return -EEXIST; |
| } |
| if (f->state != state) { |
| f->state = state; |
| f->updated = jiffies; |
| notify = 1; |
| } |
| if (f->flags != ndm_flags) { |
| f->flags = ndm_flags; |
| f->updated = jiffies; |
| notify = 1; |
| } |
| if ((flags & NLM_F_REPLACE)) { |
| /* Only change unicasts */ |
| if (!(is_multicast_ether_addr(f->eth_addr) || |
| is_zero_ether_addr(f->eth_addr))) { |
| notify |= vxlan_fdb_replace(f, ip, port, vni, |
| ifindex); |
| } else |
| return -EOPNOTSUPP; |
| } |
| if ((flags & NLM_F_APPEND) && |
| (is_multicast_ether_addr(f->eth_addr) || |
| is_zero_ether_addr(f->eth_addr))) { |
| int rc = vxlan_fdb_append(f, ip, port, vni, ifindex, |
| &rd); |
| |
| if (rc < 0) |
| return rc; |
| notify |= rc; |
| } |
| } else { |
| if (!(flags & NLM_F_CREATE)) |
| return -ENOENT; |
| |
| if (vxlan->cfg.addrmax && |
| vxlan->addrcnt >= vxlan->cfg.addrmax) |
| return -ENOSPC; |
| |
| /* Disallow replace to add a multicast entry */ |
| if ((flags & NLM_F_REPLACE) && |
| (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) |
| return -EOPNOTSUPP; |
| |
| netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); |
| f = kmalloc(sizeof(*f), GFP_ATOMIC); |
| if (!f) |
| return -ENOMEM; |
| |
| notify = 1; |
| f->state = state; |
| f->flags = ndm_flags; |
| f->updated = f->used = jiffies; |
| INIT_LIST_HEAD(&f->remotes); |
| memcpy(f->eth_addr, mac, ETH_ALEN); |
| |
| vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); |
| |
| ++vxlan->addrcnt; |
| hlist_add_head_rcu(&f->hlist, |
| vxlan_fdb_head(vxlan, mac)); |
| } |
| |
| if (notify) { |
| if (rd == NULL) |
| rd = first_remote_rtnl(f); |
| vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH); |
| } |
| |
| return 0; |
| } |
| |
| static void vxlan_fdb_free(struct rcu_head *head) |
| { |
| struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); |
| struct vxlan_rdst *rd, *nd; |
| |
| list_for_each_entry_safe(rd, nd, &f->remotes, list) |
| kfree(rd); |
| kfree(f); |
| } |
| |
| static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) |
| { |
| netdev_dbg(vxlan->dev, |
| "delete %pM\n", f->eth_addr); |
| |
| --vxlan->addrcnt; |
| vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH); |
| |
| hlist_del_rcu(&f->hlist); |
| call_rcu(&f->rcu, vxlan_fdb_free); |
| } |
| |
| static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, |
| union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex) |
| { |
| struct net *net = dev_net(vxlan->dev); |
| int err; |
| |
| if (tb[NDA_DST]) { |
| err = vxlan_nla_get_addr(ip, tb[NDA_DST]); |
| if (err) |
| return err; |
| } else { |
| union vxlan_addr *remote = &vxlan->default_dst.remote_ip; |
| if (remote->sa.sa_family == AF_INET) { |
| ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); |
| ip->sa.sa_family = AF_INET; |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| ip->sin6.sin6_addr = in6addr_any; |
| ip->sa.sa_family = AF_INET6; |
| #endif |
| } |
| } |
| |
| if (tb[NDA_PORT]) { |
| if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) |
| return -EINVAL; |
| *port = nla_get_be16(tb[NDA_PORT]); |
| } else { |
| *port = vxlan->cfg.dst_port; |
| } |
| |
| if (tb[NDA_VNI]) { |
| if (nla_len(tb[NDA_VNI]) != sizeof(u32)) |
| return -EINVAL; |
| *vni = nla_get_u32(tb[NDA_VNI]); |
| } else { |
| *vni = vxlan->default_dst.remote_vni; |
| } |
| |
| if (tb[NDA_IFINDEX]) { |
| struct net_device *tdev; |
| |
| if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) |
| return -EINVAL; |
| *ifindex = nla_get_u32(tb[NDA_IFINDEX]); |
| tdev = __dev_get_by_index(net, *ifindex); |
| if (!tdev) |
| return -EADDRNOTAVAIL; |
| } else { |
| *ifindex = 0; |
| } |
| |
| return 0; |
| } |
| |
| /* Add static entry (via netlink) */ |
| static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
| struct net_device *dev, |
| const unsigned char *addr, u16 vid, u16 flags) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| /* struct net *net = dev_net(vxlan->dev); */ |
| union vxlan_addr ip; |
| __be16 port; |
| u32 vni, ifindex; |
| int err; |
| |
| if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { |
| pr_info("RTM_NEWNEIGH with invalid state %#x\n", |
| ndm->ndm_state); |
| return -EINVAL; |
| } |
| |
| if (tb[NDA_DST] == NULL) |
| return -EINVAL; |
| |
| err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex); |
| if (err) |
| return err; |
| |
| if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) |
| return -EAFNOSUPPORT; |
| |
| spin_lock_bh(&vxlan->hash_lock); |
| err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags, |
| port, vni, ifindex, ndm->ndm_flags); |
| spin_unlock_bh(&vxlan->hash_lock); |
| |
| return err; |
| } |
| |
| /* Delete entry (via netlink) */ |
| static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
| struct net_device *dev, |
| const unsigned char *addr, u16 vid) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_fdb *f; |
| struct vxlan_rdst *rd = NULL; |
| union vxlan_addr ip; |
| __be16 port; |
| u32 vni, ifindex; |
| int err; |
| |
| err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex); |
| if (err) |
| return err; |
| |
| err = -ENOENT; |
| |
| spin_lock_bh(&vxlan->hash_lock); |
| f = vxlan_find_mac(vxlan, addr); |
| if (!f) |
| goto out; |
| |
| if (!vxlan_addr_any(&ip)) { |
| rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); |
| if (!rd) |
| goto out; |
| } |
| |
| err = 0; |
| |
| /* remove a destination if it's not the only one on the list, |
| * otherwise destroy the fdb entry |
| */ |
| if (rd && !list_is_singular(&f->remotes)) { |
| list_del_rcu(&rd->list); |
| vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH); |
| kfree_rcu(rd, rcu); |
| goto out; |
| } |
| |
| vxlan_fdb_destroy(vxlan, f); |
| |
| out: |
| spin_unlock_bh(&vxlan->hash_lock); |
| |
| return err; |
| } |
| |
| /* Dump forwarding table */ |
| static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, |
| struct net_device *dev, |
| struct net_device *filter_dev, int idx) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| unsigned int h; |
| |
| for (h = 0; h < FDB_HASH_SIZE; ++h) { |
| struct vxlan_fdb *f; |
| int err; |
| |
| hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { |
| struct vxlan_rdst *rd; |
| |
| list_for_each_entry_rcu(rd, &f->remotes, list) { |
| if (idx < cb->args[0]) |
| goto skip; |
| |
| err = vxlan_fdb_info(skb, vxlan, f, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_NEWNEIGH, |
| NLM_F_MULTI, rd); |
| if (err < 0) |
| goto out; |
| skip: |
| ++idx; |
| } |
| } |
| } |
| out: |
| return idx; |
| } |
| |
| /* Watch incoming packets to learn mapping between Ethernet address |
| * and Tunnel endpoint. |
| * Return true if packet is bogus and should be dropped. |
| */ |
| static bool vxlan_snoop(struct net_device *dev, |
| union vxlan_addr *src_ip, const u8 *src_mac) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_fdb *f; |
| |
| f = vxlan_find_mac(vxlan, src_mac); |
| if (likely(f)) { |
| struct vxlan_rdst *rdst = first_remote_rcu(f); |
| |
| if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip))) |
| return false; |
| |
| /* Don't migrate static entries, drop packets */ |
| if (f->state & NUD_NOARP) |
| return true; |
| |
| if (net_ratelimit()) |
| netdev_info(dev, |
| "%pM migrated from %pIS to %pIS\n", |
| src_mac, &rdst->remote_ip.sa, &src_ip->sa); |
| |
| rdst->remote_ip = *src_ip; |
| f->updated = jiffies; |
| vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH); |
| } else { |
| /* learned new entry */ |
| spin_lock(&vxlan->hash_lock); |
| |
| /* close off race between vxlan_flush and incoming packets */ |
| if (netif_running(dev)) |
| vxlan_fdb_create(vxlan, src_mac, src_ip, |
| NUD_REACHABLE, |
| NLM_F_EXCL|NLM_F_CREATE, |
| vxlan->cfg.dst_port, |
| vxlan->default_dst.remote_vni, |
| 0, NTF_SELF); |
| spin_unlock(&vxlan->hash_lock); |
| } |
| |
| return false; |
| } |
| |
| /* See if multicast group is already in use by other ID */ |
| static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev) |
| { |
| struct vxlan_dev *vxlan; |
| unsigned short family = dev->default_dst.remote_ip.sa.sa_family; |
| |
| /* The vxlan_sock is only used by dev, leaving group has |
| * no effect on other vxlan devices. |
| */ |
| if (family == AF_INET && dev->vn4_sock && |
| atomic_read(&dev->vn4_sock->refcnt) == 1) |
| return false; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (family == AF_INET6 && dev->vn6_sock && |
| atomic_read(&dev->vn6_sock->refcnt) == 1) |
| return false; |
| #endif |
| |
| list_for_each_entry(vxlan, &vn->vxlan_list, next) { |
| if (!netif_running(vxlan->dev) || vxlan == dev) |
| continue; |
| |
| if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock) |
| continue; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock) |
| continue; |
| #endif |
| |
| if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip, |
| &dev->default_dst.remote_ip)) |
| continue; |
| |
| if (vxlan->default_dst.remote_ifindex != |
| dev->default_dst.remote_ifindex) |
| continue; |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static void __vxlan_sock_release(struct vxlan_sock *vs) |
| { |
| struct vxlan_net *vn; |
| |
| if (!vs) |
| return; |
| if (!atomic_dec_and_test(&vs->refcnt)) |
| return; |
| |
| vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); |
| spin_lock(&vn->sock_lock); |
| hlist_del_rcu(&vs->hlist); |
| vxlan_notify_del_rx_port(vs); |
| spin_unlock(&vn->sock_lock); |
| |
| queue_work(vxlan_wq, &vs->del_work); |
| } |
| |
| static void vxlan_sock_release(struct vxlan_dev *vxlan) |
| { |
| __vxlan_sock_release(vxlan->vn4_sock); |
| #if IS_ENABLED(CONFIG_IPV6) |
| __vxlan_sock_release(vxlan->vn6_sock); |
| #endif |
| } |
| |
| /* Update multicast group membership when first VNI on |
| * multicast address is brought up |
| */ |
| static int vxlan_igmp_join(struct vxlan_dev *vxlan) |
| { |
| struct sock *sk; |
| union vxlan_addr *ip = &vxlan->default_dst.remote_ip; |
| int ifindex = vxlan->default_dst.remote_ifindex; |
| int ret = -EINVAL; |
| |
| if (ip->sa.sa_family == AF_INET) { |
| struct ip_mreqn mreq = { |
| .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr, |
| .imr_ifindex = ifindex, |
| }; |
| |
| sk = vxlan->vn4_sock->sock->sk; |
| lock_sock(sk); |
| ret = ip_mc_join_group(sk, &mreq); |
| release_sock(sk); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| sk = vxlan->vn6_sock->sock->sk; |
| lock_sock(sk); |
| ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex, |
| &ip->sin6.sin6_addr); |
| release_sock(sk); |
| #endif |
| } |
| |
| return ret; |
| } |
| |
| /* Inverse of vxlan_igmp_join when last VNI is brought down */ |
| static int vxlan_igmp_leave(struct vxlan_dev *vxlan) |
| { |
| struct sock *sk; |
| union vxlan_addr *ip = &vxlan->default_dst.remote_ip; |
| int ifindex = vxlan->default_dst.remote_ifindex; |
| int ret = -EINVAL; |
| |
| if (ip->sa.sa_family == AF_INET) { |
| struct ip_mreqn mreq = { |
| .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr, |
| .imr_ifindex = ifindex, |
| }; |
| |
| sk = vxlan->vn4_sock->sock->sk; |
| lock_sock(sk); |
| ret = ip_mc_leave_group(sk, &mreq); |
| release_sock(sk); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| sk = vxlan->vn6_sock->sock->sk; |
| lock_sock(sk); |
| ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex, |
| &ip->sin6.sin6_addr); |
| release_sock(sk); |
| #endif |
| } |
| |
| return ret; |
| } |
| |
| static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh, |
| size_t hdrlen, u32 data, bool nopartial) |
| { |
| size_t start, offset, plen; |
| |
| if (skb->remcsum_offload) |
| return vh; |
| |
| start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT; |
| offset = start + ((data & VXLAN_RCO_UDP) ? |
| offsetof(struct udphdr, check) : |
| offsetof(struct tcphdr, check)); |
| |
| plen = hdrlen + offset + sizeof(u16); |
| |
| if (!pskb_may_pull(skb, plen)) |
| return NULL; |
| |
| vh = (struct vxlanhdr *)(udp_hdr(skb) + 1); |
| |
| skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset, |
| nopartial); |
| |
| return vh; |
| } |
| |
| static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, |
| struct vxlan_metadata *md, u32 vni, |
| struct metadata_dst *tun_dst) |
| { |
| struct iphdr *oip = NULL; |
| struct ipv6hdr *oip6 = NULL; |
| struct vxlan_dev *vxlan; |
| struct pcpu_sw_netstats *stats; |
| union vxlan_addr saddr; |
| int err = 0; |
| |
| /* For flow based devices, map all packets to VNI 0 */ |
| if (vs->flags & VXLAN_F_COLLECT_METADATA) |
| vni = 0; |
| |
| /* Is this VNI defined? */ |
| vxlan = vxlan_vs_find_vni(vs, vni); |
| if (!vxlan) |
| goto drop; |
| |
| skb_reset_mac_header(skb); |
| skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev))); |
| skb->protocol = eth_type_trans(skb, vxlan->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, vxlan->dev->dev_addr)) |
| goto drop; |
| |
| /* Get data from the outer IP header */ |
| if (vxlan_get_sk_family(vs) == AF_INET) { |
| oip = ip_hdr(skb); |
| saddr.sin.sin_addr.s_addr = oip->saddr; |
| saddr.sa.sa_family = AF_INET; |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| oip6 = ipv6_hdr(skb); |
| saddr.sin6.sin6_addr = oip6->saddr; |
| saddr.sa.sa_family = AF_INET6; |
| #endif |
| } |
| |
| if (tun_dst) { |
| skb_dst_set(skb, (struct dst_entry *)tun_dst); |
| tun_dst = NULL; |
| } |
| |
| if ((vxlan->flags & VXLAN_F_LEARN) && |
| vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source)) |
| goto drop; |
| |
| skb_reset_network_header(skb); |
| /* In flow-based mode, GBP is carried in dst_metadata */ |
| if (!(vs->flags & VXLAN_F_COLLECT_METADATA)) |
| skb->mark = md->gbp; |
| |
| if (oip6) |
| err = IP6_ECN_decapsulate(oip6, skb); |
| if (oip) |
| err = IP_ECN_decapsulate(oip, skb); |
| |
| if (unlikely(err)) { |
| if (log_ecn_error) { |
| if (oip6) |
| net_info_ratelimited("non-ECT from %pI6\n", |
| &oip6->saddr); |
| if (oip) |
| net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
| &oip->saddr, oip->tos); |
| } |
| if (err > 1) { |
| ++vxlan->dev->stats.rx_frame_errors; |
| ++vxlan->dev->stats.rx_errors; |
| goto drop; |
| } |
| } |
| |
| stats = this_cpu_ptr(vxlan->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(&vxlan->gro_cells, skb); |
| |
| return; |
| drop: |
| if (tun_dst) |
| dst_release((struct dst_entry *)tun_dst); |
| |
| /* Consume bad packet */ |
| kfree_skb(skb); |
| } |
| |
| /* Callback from net/ipv4/udp.c to receive packets */ |
| static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) |
| { |
| struct metadata_dst *tun_dst = NULL; |
| struct vxlan_sock *vs; |
| struct vxlanhdr *vxh; |
| u32 flags, vni; |
| struct vxlan_metadata _md; |
| struct vxlan_metadata *md = &_md; |
| |
| /* Need Vxlan and inner Ethernet header to be present */ |
| if (!pskb_may_pull(skb, VXLAN_HLEN)) |
| goto drop; |
| |
| vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1); |
| flags = ntohl(vxh->vx_flags); |
| vni = ntohl(vxh->vx_vni); |
| |
| if (flags & VXLAN_HF_VNI) { |
| flags &= ~VXLAN_HF_VNI; |
| } else { |
| /* VNI flag always required to be set */ |
| goto bad_flags; |
| } |
| |
| if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB))) |
| goto drop; |
| vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1); |
| |
| vs = rcu_dereference_sk_user_data(sk); |
| if (!vs) |
| goto drop; |
| |
| if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { |
| vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni, |
| !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL)); |
| if (!vxh) |
| goto drop; |
| |
| flags &= ~VXLAN_HF_RCO; |
| vni &= VXLAN_VNI_MASK; |
| } |
| |
| if (vxlan_collect_metadata(vs)) { |
| tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY, |
| cpu_to_be64(vni >> 8), sizeof(*md)); |
| |
| if (!tun_dst) |
| goto drop; |
| |
| md = ip_tunnel_info_opts(&tun_dst->u.tun_info); |
| } else { |
| memset(md, 0, sizeof(*md)); |
| } |
| |
| /* For backwards compatibility, only allow reserved fields to be |
| * used by VXLAN extensions if explicitly requested. |
| */ |
| if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) { |
| struct vxlanhdr_gbp *gbp; |
| |
| gbp = (struct vxlanhdr_gbp *)vxh; |
| md->gbp = ntohs(gbp->policy_id); |
| |
| if (tun_dst) { |
| tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT; |
| tun_dst->u.tun_info.options_len = sizeof(*md); |
| } |
| |
| if (gbp->dont_learn) |
| md->gbp |= VXLAN_GBP_DONT_LEARN; |
| |
| if (gbp->policy_applied) |
| md->gbp |= VXLAN_GBP_POLICY_APPLIED; |
| |
| flags &= ~VXLAN_GBP_USED_BITS; |
| } |
| |
| if (flags || vni & ~VXLAN_VNI_MASK) { |
| /* If there are any unprocessed flags remaining treat |
| * this as a malformed packet. This behavior diverges from |
| * VXLAN RFC (RFC7348) which stipulates that bits in reserved |
| * in reserved fields are to be ignored. The approach here |
| * maintains compatibility with previous stack code, and also |
| * is more robust and provides a little more security in |
| * adding extensions to VXLAN. |
| */ |
| |
| goto bad_flags; |
| } |
| |
| vxlan_rcv(vs, skb, md, vni >> 8, tun_dst); |
| return 0; |
| |
| drop: |
| /* Consume bad packet */ |
| kfree_skb(skb); |
| return 0; |
| |
| bad_flags: |
| netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", |
| ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); |
| goto drop; |
| } |
| |
| static int arp_reduce(struct net_device *dev, struct sk_buff *skb) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct arphdr *parp; |
| u8 *arpptr, *sha; |
| __be32 sip, tip; |
| struct neighbour *n; |
| |
| if (dev->flags & IFF_NOARP) |
| goto out; |
| |
| if (!pskb_may_pull(skb, arp_hdr_len(dev))) { |
| dev->stats.tx_dropped++; |
| goto out; |
| } |
| parp = arp_hdr(skb); |
| |
| if ((parp->ar_hrd != htons(ARPHRD_ETHER) && |
| parp->ar_hrd != htons(ARPHRD_IEEE802)) || |
| parp->ar_pro != htons(ETH_P_IP) || |
| parp->ar_op != htons(ARPOP_REQUEST) || |
| parp->ar_hln != dev->addr_len || |
| parp->ar_pln != 4) |
| goto out; |
| arpptr = (u8 *)parp + sizeof(struct arphdr); |
| sha = arpptr; |
| arpptr += dev->addr_len; /* sha */ |
| memcpy(&sip, arpptr, sizeof(sip)); |
| arpptr += sizeof(sip); |
| arpptr += dev->addr_len; /* tha */ |
| memcpy(&tip, arpptr, sizeof(tip)); |
| |
| if (ipv4_is_loopback(tip) || |
| ipv4_is_multicast(tip)) |
| goto out; |
| |
| n = neigh_lookup(&arp_tbl, &tip, dev); |
| |
| if (n) { |
| struct vxlan_fdb *f; |
| struct sk_buff *reply; |
| |
| if (!(n->nud_state & NUD_CONNECTED)) { |
| neigh_release(n); |
| goto out; |
| } |
| |
| f = vxlan_find_mac(vxlan, n->ha); |
| if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { |
| /* bridge-local neighbor */ |
| neigh_release(n); |
| goto out; |
| } |
| |
| reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, |
| n->ha, sha); |
| |
| neigh_release(n); |
| |
| if (reply == NULL) |
| goto out; |
| |
| skb_reset_mac_header(reply); |
| __skb_pull(reply, skb_network_offset(reply)); |
| reply->ip_summed = CHECKSUM_UNNECESSARY; |
| reply->pkt_type = PACKET_HOST; |
| |
| if (netif_rx_ni(reply) == NET_RX_DROP) |
| dev->stats.rx_dropped++; |
| } else if (vxlan->flags & VXLAN_F_L3MISS) { |
| union vxlan_addr ipa = { |
| .sin.sin_addr.s_addr = tip, |
| .sin.sin_family = AF_INET, |
| }; |
| |
| vxlan_ip_miss(dev, &ipa); |
| } |
| out: |
| consume_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static struct sk_buff *vxlan_na_create(struct sk_buff *request, |
| struct neighbour *n, bool isrouter) |
| { |
| struct net_device *dev = request->dev; |
| struct sk_buff *reply; |
| struct nd_msg *ns, *na; |
| struct ipv6hdr *pip6; |
| u8 *daddr; |
| int na_olen = 8; /* opt hdr + ETH_ALEN for target */ |
| int ns_olen; |
| int i, len; |
| |
| if (dev == NULL) |
| return NULL; |
| |
| len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + |
| sizeof(*na) + na_olen + dev->needed_tailroom; |
| reply = alloc_skb(len, GFP_ATOMIC); |
| if (reply == NULL) |
| return NULL; |
| |
| reply->protocol = htons(ETH_P_IPV6); |
| reply->dev = dev; |
| skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); |
| skb_push(reply, sizeof(struct ethhdr)); |
| skb_set_mac_header(reply, 0); |
| |
| ns = (struct nd_msg *)skb_transport_header(request); |
| |
| daddr = eth_hdr(request)->h_source; |
| ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns); |
| for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { |
| if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { |
| daddr = ns->opt + i + sizeof(struct nd_opt_hdr); |
| break; |
| } |
| } |
| |
| /* Ethernet header */ |
| ether_addr_copy(eth_hdr(reply)->h_dest, daddr); |
| ether_addr_copy(eth_hdr(reply)->h_source, n->ha); |
| eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); |
| reply->protocol = htons(ETH_P_IPV6); |
| |
| skb_pull(reply, sizeof(struct ethhdr)); |
| skb_set_network_header(reply, 0); |
| skb_put(reply, sizeof(struct ipv6hdr)); |
| |
| /* IPv6 header */ |
| |
| pip6 = ipv6_hdr(reply); |
| memset(pip6, 0, sizeof(struct ipv6hdr)); |
| pip6->version = 6; |
| pip6->priority = ipv6_hdr(request)->priority; |
| pip6->nexthdr = IPPROTO_ICMPV6; |
| pip6->hop_limit = 255; |
| pip6->daddr = ipv6_hdr(request)->saddr; |
| pip6->saddr = *(struct in6_addr *)n->primary_key; |
| |
| skb_pull(reply, sizeof(struct ipv6hdr)); |
| skb_set_transport_header(reply, 0); |
| |
| na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen); |
| |
| /* Neighbor Advertisement */ |
| memset(na, 0, sizeof(*na)+na_olen); |
| na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; |
| na->icmph.icmp6_router = isrouter; |
| na->icmph.icmp6_override = 1; |
| na->icmph.icmp6_solicited = 1; |
| na->target = ns->target; |
| ether_addr_copy(&na->opt[2], n->ha); |
| na->opt[0] = ND_OPT_TARGET_LL_ADDR; |
| na->opt[1] = na_olen >> 3; |
| |
| na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, |
| &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, |
| csum_partial(na, sizeof(*na)+na_olen, 0)); |
| |
| pip6->payload_len = htons(sizeof(*na)+na_olen); |
| |
| skb_push(reply, sizeof(struct ipv6hdr)); |
| |
| reply->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| return reply; |
| } |
| |
| static int neigh_reduce(struct net_device *dev, struct sk_buff *skb) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct nd_msg *msg; |
| const struct ipv6hdr *iphdr; |
| const struct in6_addr *saddr, *daddr; |
| struct neighbour *n; |
| struct inet6_dev *in6_dev; |
| |
| in6_dev = __in6_dev_get(dev); |
| if (!in6_dev) |
| goto out; |
| |
| iphdr = ipv6_hdr(skb); |
| saddr = &iphdr->saddr; |
| daddr = &iphdr->daddr; |
| |
| msg = (struct nd_msg *)skb_transport_header(skb); |
| if (msg->icmph.icmp6_code != 0 || |
| msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION) |
| goto out; |
| |
| if (ipv6_addr_loopback(daddr) || |
| ipv6_addr_is_multicast(&msg->target)) |
| goto out; |
| |
| n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); |
| |
| if (n) { |
| struct vxlan_fdb *f; |
| struct sk_buff *reply; |
| |
| if (!(n->nud_state & NUD_CONNECTED)) { |
| neigh_release(n); |
| goto out; |
| } |
| |
| f = vxlan_find_mac(vxlan, n->ha); |
| if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { |
| /* bridge-local neighbor */ |
| neigh_release(n); |
| goto out; |
| } |
| |
| reply = vxlan_na_create(skb, n, |
| !!(f ? f->flags & NTF_ROUTER : 0)); |
| |
| neigh_release(n); |
| |
| if (reply == NULL) |
| goto out; |
| |
| if (netif_rx_ni(reply) == NET_RX_DROP) |
| dev->stats.rx_dropped++; |
| |
| } else if (vxlan->flags & VXLAN_F_L3MISS) { |
| union vxlan_addr ipa = { |
| .sin6.sin6_addr = msg->target, |
| .sin6.sin6_family = AF_INET6, |
| }; |
| |
| vxlan_ip_miss(dev, &ipa); |
| } |
| |
| out: |
| consume_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| #endif |
| |
| static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct neighbour *n; |
| |
| if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) |
| return false; |
| |
| n = NULL; |
| switch (ntohs(eth_hdr(skb)->h_proto)) { |
| case ETH_P_IP: |
| { |
| struct iphdr *pip; |
| |
| if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| return false; |
| pip = ip_hdr(skb); |
| n = neigh_lookup(&arp_tbl, &pip->daddr, dev); |
| if (!n && (vxlan->flags & VXLAN_F_L3MISS)) { |
| union vxlan_addr ipa = { |
| .sin.sin_addr.s_addr = pip->daddr, |
| .sin.sin_family = AF_INET, |
| }; |
| |
| vxlan_ip_miss(dev, &ipa); |
| return false; |
| } |
| |
| break; |
| } |
| #if IS_ENABLED(CONFIG_IPV6) |
| case ETH_P_IPV6: |
| { |
| struct ipv6hdr *pip6; |
| |
| if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| return false; |
| pip6 = ipv6_hdr(skb); |
| n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); |
| if (!n && (vxlan->flags & VXLAN_F_L3MISS)) { |
| union vxlan_addr ipa = { |
| .sin6.sin6_addr = pip6->daddr, |
| .sin6.sin6_family = AF_INET6, |
| }; |
| |
| vxlan_ip_miss(dev, &ipa); |
| return false; |
| } |
| |
| break; |
| } |
| #endif |
| default: |
| return false; |
| } |
| |
| if (n) { |
| bool diff; |
| |
| diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); |
| if (diff) { |
| memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, |
| dev->addr_len); |
| memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); |
| } |
| neigh_release(n); |
| return diff; |
| } |
| |
| return false; |
| } |
| |
| static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags, |
| struct vxlan_metadata *md) |
| { |
| struct vxlanhdr_gbp *gbp; |
| |
| if (!md->gbp) |
| return; |
| |
| gbp = (struct vxlanhdr_gbp *)vxh; |
| vxh->vx_flags |= htonl(VXLAN_HF_GBP); |
| |
| if (md->gbp & VXLAN_GBP_DONT_LEARN) |
| gbp->dont_learn = 1; |
| |
| if (md->gbp & VXLAN_GBP_POLICY_APPLIED) |
| gbp->policy_applied = 1; |
| |
| gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk, |
| struct sk_buff *skb, |
| struct net_device *dev, struct in6_addr *saddr, |
| struct in6_addr *daddr, __u8 prio, __u8 ttl, |
| __be16 src_port, __be16 dst_port, __be32 vni, |
| struct vxlan_metadata *md, bool xnet, u32 vxflags) |
| { |
| struct vxlanhdr *vxh; |
| int min_headroom; |
| int err; |
| bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX); |
| int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; |
| u16 hdrlen = sizeof(struct vxlanhdr); |
| |
| if ((vxflags & VXLAN_F_REMCSUM_TX) && |
| skb->ip_summed == CHECKSUM_PARTIAL) { |
| int csum_start = skb_checksum_start_offset(skb); |
| |
| if (csum_start <= VXLAN_MAX_REMCSUM_START && |
| !(csum_start & VXLAN_RCO_SHIFT_MASK) && |
| (skb->csum_offset == offsetof(struct udphdr, check) || |
| skb->csum_offset == offsetof(struct tcphdr, check))) { |
| udp_sum = false; |
| type |= SKB_GSO_TUNNEL_REMCSUM; |
| } |
| } |
| |
| skb_scrub_packet(skb, xnet); |
| |
| min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len |
| + VXLAN_HLEN + sizeof(struct ipv6hdr) |
| + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0); |
| |
| /* Need space for new headers (invalidates iph ptr) */ |
| err = skb_cow_head(skb, min_headroom); |
| if (unlikely(err)) { |
| kfree_skb(skb); |
| goto err; |
| } |
| |
| skb = vlan_hwaccel_push_inside(skb); |
| if (WARN_ON(!skb)) { |
| err = -ENOMEM; |
| goto err; |
| } |
| |
| skb = iptunnel_handle_offloads(skb, udp_sum, type); |
| if (IS_ERR(skb)) { |
| err = -EINVAL; |
| goto err; |
| } |
| |
| vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); |
| vxh->vx_flags = htonl(VXLAN_HF_VNI); |
| vxh->vx_vni = vni; |
| |
| if (type & SKB_GSO_TUNNEL_REMCSUM) { |
| u32 data = (skb_checksum_start_offset(skb) - hdrlen) >> |
| VXLAN_RCO_SHIFT; |
| |
| if (skb->csum_offset == offsetof(struct udphdr, check)) |
| data |= VXLAN_RCO_UDP; |
| |
| vxh->vx_vni |= htonl(data); |
| vxh->vx_flags |= htonl(VXLAN_HF_RCO); |
| |
| if (!skb_is_gso(skb)) { |
| skb->ip_summed = CHECKSUM_NONE; |
| skb->encapsulation = 0; |
| } |
| } |
| |
| if (vxflags & VXLAN_F_GBP) |
| vxlan_build_gbp_hdr(vxh, vxflags, md); |
| |
| skb_set_inner_protocol(skb, htons(ETH_P_TEB)); |
| |
| udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio, |
| ttl, src_port, dst_port, |
| !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX)); |
| return 0; |
| err: |
| dst_release(dst); |
| return err; |
| } |
| #endif |
| |
| static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb, |
| __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df, |
| __be16 src_port, __be16 dst_port, __be32 vni, |
| struct vxlan_metadata *md, bool xnet, u32 vxflags) |
| { |
| struct vxlanhdr *vxh; |
| int min_headroom; |
| int err; |
| bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM); |
| int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; |
| u16 hdrlen = sizeof(struct vxlanhdr); |
| |
| if ((vxflags & VXLAN_F_REMCSUM_TX) && |
| skb->ip_summed == CHECKSUM_PARTIAL) { |
| int csum_start = skb_checksum_start_offset(skb); |
| |
| if (csum_start <= VXLAN_MAX_REMCSUM_START && |
| !(csum_start & VXLAN_RCO_SHIFT_MASK) && |
| (skb->csum_offset == offsetof(struct udphdr, check) || |
| skb->csum_offset == offsetof(struct tcphdr, check))) { |
| udp_sum = false; |
| type |= SKB_GSO_TUNNEL_REMCSUM; |
| } |
| } |
| |
| min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len |
| + VXLAN_HLEN + sizeof(struct iphdr) |
| + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0); |
| |
| /* Need space for new headers (invalidates iph ptr) */ |
| err = skb_cow_head(skb, min_headroom); |
| if (unlikely(err)) { |
| kfree_skb(skb); |
| return err; |
| } |
| |
| skb = vlan_hwaccel_push_inside(skb); |
| if (WARN_ON(!skb)) |
| return -ENOMEM; |
| |
| skb = iptunnel_handle_offloads(skb, udp_sum, type); |
| if (IS_ERR(skb)) |
| return PTR_ERR(skb); |
| |
| vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); |
| vxh->vx_flags = htonl(VXLAN_HF_VNI); |
| vxh->vx_vni = vni; |
| |
| if (type & SKB_GSO_TUNNEL_REMCSUM) { |
| u32 data = (skb_checksum_start_offset(skb) - hdrlen) >> |
| VXLAN_RCO_SHIFT; |
| |
| if (skb->csum_offset == offsetof(struct udphdr, check)) |
| data |= VXLAN_RCO_UDP; |
| |
| vxh->vx_vni |= htonl(data); |
| vxh->vx_flags |= htonl(VXLAN_HF_RCO); |
| |
| if (!skb_is_gso(skb)) { |
| skb->ip_summed = CHECKSUM_NONE; |
| skb->encapsulation = 0; |
| } |
| } |
| |
| if (vxflags & VXLAN_F_GBP) |
| vxlan_build_gbp_hdr(vxh, vxflags, md); |
| |
| skb_set_inner_protocol(skb, htons(ETH_P_TEB)); |
| |
| return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos, |
| ttl, df, src_port, dst_port, xnet, |
| !(vxflags & VXLAN_F_UDP_CSUM)); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan, |
| struct sk_buff *skb, int oif, |
| const struct in6_addr *daddr, |
| struct in6_addr *saddr) |
| { |
| struct dst_entry *ndst; |
| struct flowi6 fl6; |
| int err; |
| |
| memset(&fl6, 0, sizeof(fl6)); |
| fl6.flowi6_oif = oif; |
| fl6.daddr = *daddr; |
| fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr; |
| fl6.flowi6_mark = skb->mark; |
| fl6.flowi6_proto = IPPROTO_UDP; |
| |
| err = ipv6_stub->ipv6_dst_lookup(vxlan->net, |
| vxlan->vn6_sock->sock->sk, |
| &ndst, &fl6); |
| if (err < 0) |
| return ERR_PTR(err); |
| |
| *saddr = fl6.saddr; |
| return ndst; |
| } |
| #endif |
| |
| /* Bypass encapsulation if the destination is local */ |
| static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, |
| struct vxlan_dev *dst_vxlan) |
| { |
| struct pcpu_sw_netstats *tx_stats, *rx_stats; |
| union vxlan_addr loopback; |
| union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; |
| struct net_device *dev = skb->dev; |
| int len = skb->len; |
| |
| tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); |
| rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats); |
| skb->pkt_type = PACKET_HOST; |
| skb->encapsulation = 0; |
| skb->dev = dst_vxlan->dev; |
| __skb_pull(skb, skb_network_offset(skb)); |
| |
| if (remote_ip->sa.sa_family == AF_INET) { |
| loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| loopback.sa.sa_family = AF_INET; |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| loopback.sin6.sin6_addr = in6addr_loopback; |
| loopback.sa.sa_family = AF_INET6; |
| #endif |
| } |
| |
| if (dst_vxlan->flags & VXLAN_F_LEARN) |
| vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source); |
| |
| u64_stats_update_begin(&tx_stats->syncp); |
| tx_stats->tx_packets++; |
| tx_stats->tx_bytes += len; |
| u64_stats_update_end(&tx_stats->syncp); |
| |
| if (netif_rx(skb) == NET_RX_SUCCESS) { |
| u64_stats_update_begin(&rx_stats->syncp); |
| rx_stats->rx_packets++; |
| rx_stats->rx_bytes += len; |
| u64_stats_update_end(&rx_stats->syncp); |
| } else { |
| dev->stats.rx_dropped++; |
| } |
| } |
| |
| static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, |
| struct vxlan_rdst *rdst, bool did_rsc) |
| { |
| struct ip_tunnel_info *info; |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct sock *sk; |
| struct rtable *rt = NULL; |
| const struct iphdr *old_iph; |
| struct flowi4 fl4; |
| union vxlan_addr *dst; |
| union vxlan_addr remote_ip; |
| struct vxlan_metadata _md; |
| struct vxlan_metadata *md = &_md; |
| __be16 src_port = 0, dst_port; |
| u32 vni; |
| __be16 df = 0; |
| __u8 tos, ttl; |
| int err; |
| u32 flags = vxlan->flags; |
| |
| info = skb_tunnel_info(skb); |
| |
| if (rdst) { |
| dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; |
| vni = rdst->remote_vni; |
| dst = &rdst->remote_ip; |
| } else { |
| if (!info) { |
| WARN_ONCE(1, "%s: Missing encapsulation instructions\n", |
| dev->name); |
| goto drop; |
| } |
| dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; |
| vni = be64_to_cpu(info->key.tun_id); |
| remote_ip.sa.sa_family = ip_tunnel_info_af(info); |
| if (remote_ip.sa.sa_family == AF_INET) |
| remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst; |
| else |
| remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst; |
| dst = &remote_ip; |
| } |
| |
| if (vxlan_addr_any(dst)) { |
| if (did_rsc) { |
| /* short-circuited back to local bridge */ |
| vxlan_encap_bypass(skb, vxlan, vxlan); |
| return; |
| } |
| goto drop; |
| } |
| |
| old_iph = ip_hdr(skb); |
| |
| ttl = vxlan->cfg.ttl; |
| if (!ttl && vxlan_addr_multicast(dst)) |
| ttl = 1; |
| |
| tos = vxlan->cfg.tos; |
| if (tos == 1) |
| tos = ip_tunnel_get_dsfield(old_iph, skb); |
| |
| src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, |
| vxlan->cfg.port_max, true); |
| |
| if (info) { |
| ttl = info->key.ttl; |
| tos = info->key.tos; |
| |
| if (info->options_len) |
| md = ip_tunnel_info_opts(info); |
| } else { |
| md->gbp = skb->mark; |
| } |
| |
| if (dst->sa.sa_family == AF_INET) { |
| if (!vxlan->vn4_sock) |
| goto drop; |
| sk = vxlan->vn4_sock->sock->sk; |
| |
| if (info) { |
| if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) |
| df = htons(IP_DF); |
| |
| if (info->key.tun_flags & TUNNEL_CSUM) |
| flags |= VXLAN_F_UDP_CSUM; |
| else |
| flags &= ~VXLAN_F_UDP_CSUM; |
| } |
| |
| memset(&fl4, 0, sizeof(fl4)); |
| fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0; |
| fl4.flowi4_tos = RT_TOS(tos); |
| fl4.flowi4_mark = skb->mark; |
| fl4.flowi4_proto = IPPROTO_UDP; |
| fl4.daddr = dst->sin.sin_addr.s_addr; |
| fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr; |
| |
| rt = ip_route_output_key(vxlan->net, &fl4); |
| if (IS_ERR(rt)) { |
| netdev_dbg(dev, "no route to %pI4\n", |
| &dst->sin.sin_addr.s_addr); |
| dev->stats.tx_carrier_errors++; |
| goto tx_error; |
| } |
| |
| if (rt->dst.dev == dev) { |
| netdev_dbg(dev, "circular route to %pI4\n", |
| &dst->sin.sin_addr.s_addr); |
| dev->stats.collisions++; |
| goto rt_tx_error; |
| } |
| |
| /* Bypass encapsulation if the destination is local */ |
| if (rt->rt_flags & RTCF_LOCAL && |
| !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { |
| struct vxlan_dev *dst_vxlan; |
| |
| ip_rt_put(rt); |
| dst_vxlan = vxlan_find_vni(vxlan->net, vni, |
| dst->sa.sa_family, dst_port, |
| vxlan->flags); |
| if (!dst_vxlan) |
| goto tx_error; |
| vxlan_encap_bypass(skb, vxlan, dst_vxlan); |
| return; |
| } |
| |
| tos = ip_tunnel_ecn_encap(tos, old_iph, skb); |
| ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
| err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr, |
| dst->sin.sin_addr.s_addr, tos, ttl, df, |
| src_port, dst_port, htonl(vni << 8), md, |
| !net_eq(vxlan->net, dev_net(vxlan->dev)), |
| flags); |
| if (err < 0) { |
| /* skb is already freed. */ |
| skb = NULL; |
| goto rt_tx_error; |
| } |
| |
| iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| struct dst_entry *ndst; |
| struct in6_addr saddr; |
| u32 rt6i_flags; |
| |
| if (!vxlan->vn6_sock) |
| goto drop; |
| sk = vxlan->vn6_sock->sock->sk; |
| |
| ndst = vxlan6_get_route(vxlan, skb, |
| rdst ? rdst->remote_ifindex : 0, |
| &dst->sin6.sin6_addr, &saddr); |
| if (IS_ERR(ndst)) { |
| netdev_dbg(dev, "no route to %pI6\n", |
| &dst->sin6.sin6_addr); |
| dev->stats.tx_carrier_errors++; |
| goto tx_error; |
| } |
| |
| if (ndst->dev == dev) { |
| netdev_dbg(dev, "circular route to %pI6\n", |
| &dst->sin6.sin6_addr); |
| dst_release(ndst); |
| dev->stats.collisions++; |
| goto tx_error; |
| } |
| |
| /* Bypass encapsulation if the destination is local */ |
| rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags; |
| if (rt6i_flags & RTF_LOCAL && |
| !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { |
| struct vxlan_dev *dst_vxlan; |
| |
| dst_release(ndst); |
| dst_vxlan = vxlan_find_vni(vxlan->net, vni, |
| dst->sa.sa_family, dst_port, |
| vxlan->flags); |
| if (!dst_vxlan) |
| goto tx_error; |
| vxlan_encap_bypass(skb, vxlan, dst_vxlan); |
| return; |
| } |
| |
| if (info) { |
| if (info->key.tun_flags & TUNNEL_CSUM) |
| flags &= ~VXLAN_F_UDP_ZERO_CSUM6_TX; |
| else |
| flags |= VXLAN_F_UDP_ZERO_CSUM6_TX; |
| } |
| |
| ttl = ttl ? : ip6_dst_hoplimit(ndst); |
| err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr, |
| 0, ttl, src_port, dst_port, htonl(vni << 8), md, |
| !net_eq(vxlan->net, dev_net(vxlan->dev)), |
| flags); |
| #endif |
| } |
| |
| return; |
| |
| drop: |
| dev->stats.tx_dropped++; |
| goto tx_free; |
| |
| rt_tx_error: |
| ip_rt_put(rt); |
| tx_error: |
| dev->stats.tx_errors++; |
| tx_free: |
| dev_kfree_skb(skb); |
| } |
| |
| /* Transmit local packets over Vxlan |
| * |
| * Outer IP header inherits ECN and DF from inner header. |
| * Outer UDP destination is the VXLAN assigned port. |
| * source port is based on hash of flow |
| */ |
| static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| const struct ip_tunnel_info *info; |
| struct ethhdr *eth; |
| bool did_rsc = false; |
| struct vxlan_rdst *rdst, *fdst = NULL; |
| struct vxlan_fdb *f; |
| |
| info = skb_tunnel_info(skb); |
| |
| skb_reset_mac_header(skb); |
| eth = eth_hdr(skb); |
| |
| if ((vxlan->flags & VXLAN_F_PROXY)) { |
| if (ntohs(eth->h_proto) == ETH_P_ARP) |
| return arp_reduce(dev, skb); |
| #if IS_ENABLED(CONFIG_IPV6) |
| else if (ntohs(eth->h_proto) == ETH_P_IPV6 && |
| pskb_may_pull(skb, sizeof(struct ipv6hdr) |
| + sizeof(struct nd_msg)) && |
| ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { |
| struct nd_msg *msg; |
| |
| msg = (struct nd_msg *)skb_transport_header(skb); |
| if (msg->icmph.icmp6_code == 0 && |
| msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) |
| return neigh_reduce(dev, skb); |
| } |
| eth = eth_hdr(skb); |
| #endif |
| } |
| |
| if (vxlan->flags & VXLAN_F_COLLECT_METADATA && |
| info && info->mode & IP_TUNNEL_INFO_TX) { |
| vxlan_xmit_one(skb, dev, NULL, false); |
| return NETDEV_TX_OK; |
| } |
| |
| f = vxlan_find_mac(vxlan, eth->h_dest); |
| did_rsc = false; |
| |
| if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) && |
| (ntohs(eth->h_proto) == ETH_P_IP || |
| ntohs(eth->h_proto) == ETH_P_IPV6)) { |
| did_rsc = route_shortcircuit(dev, skb); |
| if (did_rsc) |
| f = vxlan_find_mac(vxlan, eth->h_dest); |
| } |
| |
| if (f == NULL) { |
| f = vxlan_find_mac(vxlan, all_zeros_mac); |
| if (f == NULL) { |
| if ((vxlan->flags & VXLAN_F_L2MISS) && |
| !is_multicast_ether_addr(eth->h_dest)) |
| vxlan_fdb_miss(vxlan, eth->h_dest); |
| |
| dev->stats.tx_dropped++; |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| } |
| |
| list_for_each_entry_rcu(rdst, &f->remotes, list) { |
| struct sk_buff *skb1; |
| |
| if (!fdst) { |
| fdst = rdst; |
| continue; |
| } |
| skb1 = skb_clone(skb, GFP_ATOMIC); |
| if (skb1) |
| vxlan_xmit_one(skb1, dev, rdst, did_rsc); |
| } |
| |
| if (fdst) |
| vxlan_xmit_one(skb, dev, fdst, did_rsc); |
| else |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| /* Walk the forwarding table and purge stale entries */ |
| static void vxlan_cleanup(unsigned long arg) |
| { |
| struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; |
| unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; |
| unsigned int h; |
| |
| if (!netif_running(vxlan->dev)) |
| return; |
| |
| for (h = 0; h < FDB_HASH_SIZE; ++h) { |
| struct hlist_node *p, *n; |
| |
| spin_lock_bh(&vxlan->hash_lock); |
| hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { |
| struct vxlan_fdb *f |
| = container_of(p, struct vxlan_fdb, hlist); |
| unsigned long timeout; |
| |
| if (f->state & NUD_PERMANENT) |
| continue; |
| |
| timeout = f->used + vxlan->cfg.age_interval * HZ; |
| if (time_before_eq(timeout, jiffies)) { |
| netdev_dbg(vxlan->dev, |
| "garbage collect %pM\n", |
| f->eth_addr); |
| f->state = NUD_STALE; |
| vxlan_fdb_destroy(vxlan, f); |
| } else if (time_before(timeout, next_timer)) |
| next_timer = timeout; |
| } |
| spin_unlock_bh(&vxlan->hash_lock); |
| } |
| |
| mod_timer(&vxlan->age_timer, next_timer); |
| } |
| |
| static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan) |
| { |
| struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); |
| __u32 vni = vxlan->default_dst.remote_vni; |
| |
| spin_lock(&vn->sock_lock); |
| hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni)); |
| spin_unlock(&vn->sock_lock); |
| } |
| |
| /* Setup stats when device is created */ |
| static int vxlan_init(struct net_device *dev) |
| { |
| dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| if (!dev->tstats) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan) |
| { |
| struct vxlan_fdb *f; |
| |
| spin_lock_bh(&vxlan->hash_lock); |
| f = __vxlan_find_mac(vxlan, all_zeros_mac); |
| if (f) |
| vxlan_fdb_destroy(vxlan, f); |
| spin_unlock_bh(&vxlan->hash_lock); |
| } |
| |
| static void vxlan_uninit(struct net_device *dev) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| |
| vxlan_fdb_delete_default(vxlan); |
| |
| free_percpu(dev->tstats); |
| } |
| |
| /* Start ageing timer and join group when device is brought up */ |
| static int vxlan_open(struct net_device *dev) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| int ret; |
| |
| ret = vxlan_sock_add(vxlan); |
| if (ret < 0) |
| return ret; |
| |
| if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) { |
| ret = vxlan_igmp_join(vxlan); |
| if (ret == -EADDRINUSE) |
| ret = 0; |
| if (ret) { |
| vxlan_sock_release(vxlan); |
| return ret; |
| } |
| } |
| |
| if (vxlan->cfg.age_interval) |
| mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); |
| |
| return ret; |
| } |
| |
| /* Purge the forwarding table */ |
| static void vxlan_flush(struct vxlan_dev *vxlan) |
| { |
| unsigned int h; |
| |
| spin_lock_bh(&vxlan->hash_lock); |
| for (h = 0; h < FDB_HASH_SIZE; ++h) { |
| struct hlist_node *p, *n; |
| hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { |
| struct vxlan_fdb *f |
| = container_of(p, struct vxlan_fdb, hlist); |
| /* the all_zeros_mac entry is deleted at vxlan_uninit */ |
| if (!is_zero_ether_addr(f->eth_addr)) |
| vxlan_fdb_destroy(vxlan, f); |
| } |
| } |
| spin_unlock_bh(&vxlan->hash_lock); |
| } |
| |
| /* Cleanup timer and forwarding table on shutdown */ |
| static int vxlan_stop(struct net_device *dev) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); |
| int ret = 0; |
| |
| if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) && |
| !vxlan_group_used(vn, vxlan)) |
| ret = vxlan_igmp_leave(vxlan); |
| |
| del_timer_sync(&vxlan->age_timer); |
| |
| vxlan_flush(vxlan); |
| vxlan_sock_release(vxlan); |
| |
| return ret; |
| } |
| |
| /* Stub, nothing needs to be done. */ |
| static void vxlan_set_multicast_list(struct net_device *dev) |
| { |
| } |
| |
| static int __vxlan_change_mtu(struct net_device *dev, |
| struct net_device *lowerdev, |
| struct vxlan_rdst *dst, int new_mtu, bool strict) |
| { |
| int max_mtu = IP_MAX_MTU; |
| |
| if (lowerdev) |
| max_mtu = lowerdev->mtu; |
| |
| if (dst->remote_ip.sa.sa_family == AF_INET6) |
| max_mtu -= VXLAN6_HEADROOM; |
| else |
| max_mtu -= VXLAN_HEADROOM; |
| |
| 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 vxlan_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_rdst *dst = &vxlan->default_dst; |
| struct net_device *lowerdev = __dev_get_by_index(vxlan->net, |
| dst->remote_ifindex); |
| return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true); |
| } |
| |
| static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb, |
| struct ip_tunnel_info *info, |
| __be16 sport, __be16 dport) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct rtable *rt; |
| struct flowi4 fl4; |
| |
| memset(&fl4, 0, sizeof(fl4)); |
| fl4.flowi4_tos = RT_TOS(info->key.tos); |
| fl4.flowi4_mark = skb->mark; |
| fl4.flowi4_proto = IPPROTO_UDP; |
| fl4.daddr = info->key.u.ipv4.dst; |
| |
| rt = ip_route_output_key(vxlan->net, &fl4); |
| if (IS_ERR(rt)) |
| return PTR_ERR(rt); |
| ip_rt_put(rt); |
| |
| info->key.u.ipv4.src = fl4.saddr; |
| info->key.tp_src = sport; |
| info->key.tp_dst = dport; |
| return 0; |
| } |
| |
| static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct ip_tunnel_info *info = skb_tunnel_info(skb); |
| __be16 sport, dport; |
| |
| sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, |
| vxlan->cfg.port_max, true); |
| dport = info->key.tp_dst ? : vxlan->cfg.dst_port; |
| |
| if (ip_tunnel_info_af(info) == AF_INET) { |
| if (!vxlan->vn4_sock) |
| return -EINVAL; |
| return egress_ipv4_tun_info(dev, skb, info, sport, dport); |
| } else { |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct dst_entry *ndst; |
| |
| if (!vxlan->vn6_sock) |
| return -EINVAL; |
| ndst = vxlan6_get_route(vxlan, skb, 0, |
| &info->key.u.ipv6.dst, |
| &info->key.u.ipv6.src); |
| if (IS_ERR(ndst)) |
| return PTR_ERR(ndst); |
| dst_release(ndst); |
| |
| info->key.tp_src = sport; |
| info->key.tp_dst = dport; |
| #else /* !CONFIG_IPV6 */ |
| return -EPFNOSUPPORT; |
| #endif |
| } |
| return 0; |
| } |
| |
| static const struct net_device_ops vxlan_netdev_ops = { |
| .ndo_init = vxlan_init, |
| .ndo_uninit = vxlan_uninit, |
| .ndo_open = vxlan_open, |
| .ndo_stop = vxlan_stop, |
| .ndo_start_xmit = vxlan_xmit, |
| .ndo_get_stats64 = ip_tunnel_get_stats64, |
| .ndo_set_rx_mode = vxlan_set_multicast_list, |
| .ndo_change_mtu = vxlan_change_mtu, |
| .ndo_validate_addr = eth_validate_addr, |
| .ndo_set_mac_address = eth_mac_addr, |
| .ndo_fdb_add = vxlan_fdb_add, |
| .ndo_fdb_del = vxlan_fdb_delete, |
| .ndo_fdb_dump = vxlan_fdb_dump, |
| .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, |
| }; |
| |
| /* Info for udev, that this is a virtual tunnel endpoint */ |
| static struct device_type vxlan_type = { |
| .name = "vxlan", |
| }; |
| |
| /* Calls the ndo_add_vxlan_port of the caller in order to |
| * supply the listening VXLAN udp ports. Callers are expected |
| * to implement the ndo_add_vxlan_port. |
| */ |
| void vxlan_get_rx_port(struct net_device *dev) |
| { |
| struct vxlan_sock *vs; |
| struct net *net = dev_net(dev); |
| struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
| sa_family_t sa_family; |
| __be16 port; |
| unsigned int i; |
| |
| spin_lock(&vn->sock_lock); |
| for (i = 0; i < PORT_HASH_SIZE; ++i) { |
| hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { |
| port = inet_sk(vs->sock->sk)->inet_sport; |
| sa_family = vxlan_get_sk_family(vs); |
| dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family, |
| port); |
| } |
| } |
| spin_unlock(&vn->sock_lock); |
| } |
| EXPORT_SYMBOL_GPL(vxlan_get_rx_port); |
| |
| /* Initialize the device structure. */ |
| static void vxlan_setup(struct net_device *dev) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| unsigned int h; |
| |
| eth_hw_addr_random(dev); |
| ether_setup(dev); |
| |
| dev->netdev_ops = &vxlan_netdev_ops; |
| dev->destructor = free_netdev; |
| SET_NETDEV_DEVTYPE(dev, &vxlan_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->vlan_features = dev->features; |
| dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
| dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; |
| dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
| dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
| netif_keep_dst(dev); |
| dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; |
| |
| INIT_LIST_HEAD(&vxlan->next); |
| spin_lock_init(&vxlan->hash_lock); |
| |
| init_timer_deferrable(&vxlan->age_timer); |
| vxlan->age_timer.function = vxlan_cleanup; |
| vxlan->age_timer.data = (unsigned long) vxlan; |
| |
| vxlan->cfg.dst_port = htons(vxlan_port); |
| |
| vxlan->dev = dev; |
| |
| gro_cells_init(&vxlan->gro_cells, dev); |
| |
| for (h = 0; h < FDB_HASH_SIZE; ++h) |
| INIT_HLIST_HEAD(&vxlan->fdb_head[h]); |
| } |
| |
| static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { |
| [IFLA_VXLAN_ID] = { .type = NLA_U32 }, |
| [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
| [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, |
| [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, |
| [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
| [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, |
| [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, |
| [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, |
| [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, |
| [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, |
| [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, |
| [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, |
| [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, |
| }; |
| |
| static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) |
| { |
| if (tb[IFLA_ADDRESS]) { |
| if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
| pr_debug("invalid link address (not ethernet)\n"); |
| return -EINVAL; |
| } |
| |
| if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { |
| pr_debug("invalid all zero ethernet address\n"); |
| return -EADDRNOTAVAIL; |
| } |
| } |
| |
| if (!data) |
| return -EINVAL; |
| |
| if (data[IFLA_VXLAN_ID]) { |
| __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); |
| if (id >= VXLAN_VID_MASK) |
| return -ERANGE; |
| } |
| |
| if (data[IFLA_VXLAN_PORT_RANGE]) { |
| const struct ifla_vxlan_port_range *p |
| = nla_data(data[IFLA_VXLAN_PORT_RANGE]); |
| |
| if (ntohs(p->high) < ntohs(p->low)) { |
| pr_debug("port range %u .. %u not valid\n", |
| ntohs(p->low), ntohs(p->high)); |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void vxlan_get_drvinfo(struct net_device *netdev, |
| struct ethtool_drvinfo *drvinfo) |
| { |
| strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); |
| strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); |
| } |
| |
| static const struct ethtool_ops vxlan_ethtool_ops = { |
| .get_drvinfo = vxlan_get_drvinfo, |
| .get_link = ethtool_op_get_link, |
| }; |
| |
| static void vxlan_del_work(struct work_struct *work) |
| { |
| struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work); |
| udp_tunnel_sock_release(vs->sock); |
| kfree_rcu(vs, rcu); |
| } |
| |
| static struct socket *vxlan_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.use_udp6_rx_checksums = |
| !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); |
| udp_conf.ipv6_v6only = 1; |
| } else { |
| udp_conf.family = AF_INET; |
| } |
| |
| 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; |
| } |
| |
| /* Create new listen socket if needed */ |
| static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, |
| __be16 port, u32 flags) |
| { |
| struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
| struct vxlan_sock *vs; |
| struct socket *sock; |
| unsigned int h; |
| struct udp_tunnel_sock_cfg tunnel_cfg; |
| |
| vs = kzalloc(sizeof(*vs), GFP_KERNEL); |
| if (!vs) |
| return ERR_PTR(-ENOMEM); |
| |
| for (h = 0; h < VNI_HASH_SIZE; ++h) |
| INIT_HLIST_HEAD(&vs->vni_list[h]); |
| |
| INIT_WORK(&vs->del_work, vxlan_del_work); |
| |
| sock = vxlan_create_sock(net, ipv6, port, flags); |
| if (IS_ERR(sock)) { |
| pr_info("Cannot bind port %d, err=%ld\n", ntohs(port), |
| PTR_ERR(sock)); |
| kfree(vs); |
| return ERR_CAST(sock); |
| } |
| |
| vs->sock = sock; |
| atomic_set(&vs->refcnt, 1); |
| vs->flags = (flags & VXLAN_F_RCV_FLAGS); |
| |
| /* Initialize the vxlan udp offloads structure */ |
| vs->udp_offloads.port = port; |
| vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive; |
| vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete; |
| |
| spin_lock(&vn->sock_lock); |
| hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); |
| vxlan_notify_add_rx_port(vs); |
| spin_unlock(&vn->sock_lock); |
| |
| /* Mark socket as an encapsulation socket. */ |
| tunnel_cfg.sk_user_data = vs; |
| tunnel_cfg.encap_type = 1; |
| tunnel_cfg.encap_rcv = vxlan_udp_encap_recv; |
| tunnel_cfg.encap_destroy = NULL; |
| |
| setup_udp_tunnel_sock(net, sock, &tunnel_cfg); |
| |
| return vs; |
| } |
| |
| static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) |
| { |
| struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); |
| struct vxlan_sock *vs = NULL; |
| |
| if (!vxlan->cfg.no_share) { |
| spin_lock(&vn->sock_lock); |
| vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, |
| vxlan->cfg.dst_port, vxlan->flags); |
| if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) { |
| spin_unlock(&vn->sock_lock); |
| return -EBUSY; |
| } |
| spin_unlock(&vn->sock_lock); |
| } |
| if (!vs) |
| vs = vxlan_socket_create(vxlan->net, ipv6, |
| vxlan->cfg.dst_port, vxlan->flags); |
| if (IS_ERR(vs)) |
| return PTR_ERR(vs); |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (ipv6) |
| vxlan->vn6_sock = vs; |
| else |
| #endif |
| vxlan->vn4_sock = vs; |
| vxlan_vs_add_dev(vs, vxlan); |
| return 0; |
| } |
| |
| static int vxlan_sock_add(struct vxlan_dev *vxlan) |
| { |
| bool ipv6 = vxlan->flags & VXLAN_F_IPV6; |
| bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA; |
| int ret = 0; |
| |
| vxlan->vn4_sock = NULL; |
| #if IS_ENABLED(CONFIG_IPV6) |
| vxlan->vn6_sock = NULL; |
| if (ipv6 || metadata) |
| ret = __vxlan_sock_add(vxlan, true); |
| #endif |
| if (!ret && (!ipv6 || metadata)) |
| ret = __vxlan_sock_add(vxlan, false); |
| if (ret < 0) |
| vxlan_sock_release(vxlan); |
| return ret; |
| } |
| |
| static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, |
| struct vxlan_config *conf) |
| { |
| struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); |
| struct vxlan_dev *vxlan = netdev_priv(dev), *tmp; |
| struct vxlan_rdst *dst = &vxlan->default_dst; |
| unsigned short needed_headroom = ETH_HLEN; |
| int err; |
| bool use_ipv6 = false; |
| __be16 default_port = vxlan->cfg.dst_port; |
| struct net_device *lowerdev = NULL; |
| |
| vxlan->net = src_net; |
| |
| dst->remote_vni = conf->vni; |
| |
| memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); |
| |
| /* Unless IPv6 is explicitly requested, assume IPv4 */ |
| if (!dst->remote_ip.sa.sa_family) |
| dst->remote_ip.sa.sa_family = AF_INET; |
| |
| if (dst->remote_ip.sa.sa_family == AF_INET6 || |
| vxlan->cfg.saddr.sa.sa_family == AF_INET6) { |
| if (!IS_ENABLED(CONFIG_IPV6)) |
| return -EPFNOSUPPORT; |
| use_ipv6 = true; |
| vxlan->flags |= VXLAN_F_IPV6; |
| } |
| |
| if (conf->remote_ifindex) { |
| lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); |
| dst->remote_ifindex = conf->remote_ifindex; |
| |
| if (!lowerdev) { |
| pr_info("ifindex %d does not exist\n", dst->remote_ifindex); |
| return -ENODEV; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (use_ipv6) { |
| struct inet6_dev *idev = __in6_dev_get(lowerdev); |
| if (idev && idev->cnf.disable_ipv6) { |
| pr_info("IPv6 is disabled via sysctl\n"); |
| return -EPERM; |
| } |
| } |
| #endif |
| |
| if (!conf->mtu) |
| dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM); |
| |
| needed_headroom = lowerdev->hard_header_len; |
| } |
| |
| if (conf->mtu) { |
| err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false); |
| if (err) |
| return err; |
| } |
| |
| if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA) |
| needed_headroom += VXLAN6_HEADROOM; |
| else |
| needed_headroom += VXLAN_HEADROOM; |
| dev->needed_headroom = needed_headroom; |
| |
| memcpy(&vxlan->cfg, conf, sizeof(*conf)); |
| if (!vxlan->cfg.dst_port) |
| vxlan->cfg.dst_port = default_port; |
| vxlan->flags |= conf->flags; |
| |
| if (!vxlan->cfg.age_interval) |
| vxlan->cfg.age_interval = FDB_AGE_DEFAULT; |
| |
| list_for_each_entry(tmp, &vn->vxlan_list, next) { |
| if (tmp->cfg.vni == conf->vni && |
| (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 || |
| tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 && |
| tmp->cfg.dst_port == vxlan->cfg.dst_port && |
| (tmp->flags & VXLAN_F_RCV_FLAGS) == |
| (vxlan->flags & VXLAN_F_RCV_FLAGS)) |
| return -EEXIST; |
| } |
| |
| dev->ethtool_ops = &vxlan_ethtool_ops; |
| |
| /* create an fdb entry for a valid default destination */ |
| if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) { |
| err = vxlan_fdb_create(vxlan, all_zeros_mac, |
| &vxlan->default_dst.remote_ip, |
| NUD_REACHABLE|NUD_PERMANENT, |
| NLM_F_EXCL|NLM_F_CREATE, |
| vxlan->cfg.dst_port, |
| vxlan->default_dst.remote_vni, |
| vxlan->default_dst.remote_ifindex, |
| NTF_SELF); |
| if (err) |
| return err; |
| } |
| |
| err = register_netdevice(dev); |
| if (err) { |
| vxlan_fdb_delete_default(vxlan); |
| return err; |
| } |
| |
| list_add(&vxlan->next, &vn->vxlan_list); |
| |
| return 0; |
| } |
| |
| struct net_device *vxlan_dev_create(struct net *net, const char *name, |
| u8 name_assign_type, struct vxlan_config *conf) |
| { |
| struct nlattr *tb[IFLA_MAX+1]; |
| struct net_device *dev; |
| int err; |
| |
| memset(&tb, 0, sizeof(tb)); |
| |
| dev = rtnl_create_link(net, name, name_assign_type, |
| &vxlan_link_ops, tb); |
| if (IS_ERR(dev)) |
| return dev; |
| |
| err = vxlan_dev_configure(net, dev, conf); |
| if (err < 0) { |
| free_netdev(dev); |
| return ERR_PTR(err); |
| } |
| |
| return dev; |
| } |
| EXPORT_SYMBOL_GPL(vxlan_dev_create); |
| |
| static int vxlan_newlink(struct net *src_net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[]) |
| { |
| struct vxlan_config conf; |
| int err; |
| |
| memset(&conf, 0, sizeof(conf)); |
| |
| if (data[IFLA_VXLAN_ID]) |
| conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]); |
| |
| if (data[IFLA_VXLAN_GROUP]) { |
| conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); |
| } else if (data[IFLA_VXLAN_GROUP6]) { |
| if (!IS_ENABLED(CONFIG_IPV6)) |
| return -EPFNOSUPPORT; |
| |
| conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); |
| conf.remote_ip.sa.sa_family = AF_INET6; |
| } |
| |
| if (data[IFLA_VXLAN_LOCAL]) { |
| conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); |
| conf.saddr.sa.sa_family = AF_INET; |
|