| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * VXLAN: Virtual eXtensible Local Area Network |
| * |
| * Copyright (c) 2012-2013 Vyatta Inc. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/udp.h> |
| #include <linux/igmp.h> |
| #include <linux/if_ether.h> |
| #include <linux/ethtool.h> |
| #include <net/arp.h> |
| #include <net/ndisc.h> |
| #include <net/ipv6_stubs.h> |
| #include <net/ip.h> |
| #include <net/icmp.h> |
| #include <net/rtnetlink.h> |
| #include <net/inet_ecn.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| #include <net/tun_proto.h> |
| #include <net/vxlan.h> |
| #include <net/nexthop.h> |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| #include <net/ip6_tunnel.h> |
| #include <net/ip6_checksum.h> |
| #endif |
| |
| #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 unsigned int vxlan_net_id; |
| static struct rtnl_link_ops vxlan_link_ops; |
| |
| static const u8 all_zeros_mac[ETH_ALEN + 2]; |
| |
| static int vxlan_sock_add(struct vxlan_dev *vxlan); |
| |
| static void vxlan_vs_del_dev(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 */ |
| __be32 vni; |
| u16 flags; /* see ndm_flags and below */ |
| struct list_head nh_list; |
| struct nexthop __rcu *nh; |
| struct vxlan_dev __rcu *vdev; |
| }; |
| |
| #define NTF_VXLAN_ADDED_BY_USER 0x100 |
| |
| /* salt for hash table */ |
| static u32 vxlan_salt __read_mostly; |
| |
| 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 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 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, __be32 vni) |
| { |
| return &vs->vni_list[hash_32((__force u32)vni, 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) |
| { |
| if (rcu_access_pointer(fdb->nh)) |
| return NULL; |
| return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list); |
| } |
| |
| static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb) |
| { |
| if (rcu_access_pointer(fdb->nh)) |
| return NULL; |
| 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, int ifindex) |
| { |
| 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 && |
| vs->sock->sk->sk_bound_dev_if == ifindex) |
| return vs; |
| } |
| return NULL; |
| } |
| |
| static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex, |
| __be32 vni) |
| { |
| struct vxlan_dev_node *node; |
| |
| /* For flow based devices, map all packets to VNI 0 */ |
| if (vs->flags & VXLAN_F_COLLECT_METADATA) |
| vni = 0; |
| |
| hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { |
| if (node->vxlan->default_dst.remote_vni != vni) |
| continue; |
| |
| if (IS_ENABLED(CONFIG_IPV6)) { |
| const struct vxlan_config *cfg = &node->vxlan->cfg; |
| |
| if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && |
| cfg->remote_ifindex != ifindex) |
| continue; |
| } |
| |
| return node->vxlan; |
| } |
| |
| return NULL; |
| } |
| |
| /* Look up VNI in a per net namespace table */ |
| static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, |
| __be32 vni, sa_family_t family, |
| __be16 port, u32 flags) |
| { |
| struct vxlan_sock *vs; |
| |
| vs = vxlan_find_sock(net, family, port, flags, ifindex); |
| if (!vs) |
| return NULL; |
| |
| return vxlan_vs_find_vni(vs, ifindex, vni); |
| } |
| |
| /* 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; |
| bool send_ip, send_eth; |
| struct nlmsghdr *nlh; |
| struct nexthop *nh; |
| struct ndmsg *ndm; |
| int nh_family; |
| u32 nh_id; |
| |
| 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; |
| |
| rcu_read_lock(); |
| nh = rcu_dereference(fdb->nh); |
| if (nh) { |
| nh_family = nexthop_get_family(nh); |
| nh_id = nh->id; |
| } |
| rcu_read_unlock(); |
| |
| if (type == RTM_GETNEIGH) { |
| if (rdst) { |
| send_ip = !vxlan_addr_any(&rdst->remote_ip); |
| ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; |
| } else if (nh) { |
| ndm->ndm_family = nh_family; |
| } |
| 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; |
| if (rdst && rdst->offloaded) |
| ndm->ndm_flags |= NTF_OFFLOADED; |
| ndm->ndm_type = RTN_UNICAST; |
| |
| if (!net_eq(dev_net(vxlan->dev), vxlan->net) && |
| nla_put_s32(skb, NDA_LINK_NETNSID, |
| peernet2id(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 (nh) { |
| if (nla_put_u32(skb, NDA_NH_ID, nh_id)) |
| goto nla_put_failure; |
| } else if (rdst) { |
| 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, be32_to_cpu(rdst->remote_vni))) |
| goto nla_put_failure; |
| if (rdst->remote_ifindex && |
| nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) |
| goto nla_put_failure; |
| } |
| |
| if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni && |
| nla_put_u32(skb, NDA_SRC_VNI, |
| be32_to_cpu(fdb->vni))) |
| 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_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, |
| const struct vxlan_fdb *fdb, |
| const struct vxlan_rdst *rd, |
| struct netlink_ext_ack *extack, |
| struct switchdev_notifier_vxlan_fdb_info *fdb_info) |
| { |
| fdb_info->info.dev = vxlan->dev; |
| fdb_info->info.extack = extack; |
| fdb_info->remote_ip = rd->remote_ip; |
| fdb_info->remote_port = rd->remote_port; |
| fdb_info->remote_vni = rd->remote_vni; |
| fdb_info->remote_ifindex = rd->remote_ifindex; |
| memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN); |
| fdb_info->vni = fdb->vni; |
| fdb_info->offloaded = rd->offloaded; |
| fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; |
| } |
| |
| static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, |
| struct vxlan_fdb *fdb, |
| struct vxlan_rdst *rd, |
| bool adding, |
| struct netlink_ext_ack *extack) |
| { |
| struct switchdev_notifier_vxlan_fdb_info info; |
| enum switchdev_notifier_type notifier_type; |
| int ret; |
| |
| if (WARN_ON(!rd)) |
| return 0; |
| |
| notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE |
| : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; |
| vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); |
| ret = call_switchdev_notifiers(notifier_type, vxlan->dev, |
| &info.info, extack); |
| return notifier_to_errno(ret); |
| } |
| |
| static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, |
| struct vxlan_rdst *rd, int type, bool swdev_notify, |
| struct netlink_ext_ack *extack) |
| { |
| int err; |
| |
| if (swdev_notify && rd) { |
| switch (type) { |
| case RTM_NEWNEIGH: |
| err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, |
| true, extack); |
| if (err) |
| return err; |
| break; |
| case RTM_DELNEIGH: |
| vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, |
| false, extack); |
| break; |
| } |
| } |
| |
| __vxlan_fdb_notify(vxlan, fdb, rd, type); |
| return 0; |
| } |
| |
| 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 = cpu_to_be32(VXLAN_N_VID), |
| }; |
| |
| vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); |
| } |
| |
| 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, true, NULL); |
| } |
| |
| /* 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); |
| } |
| |
| static u32 eth_vni_hash(const unsigned char *addr, __be32 vni) |
| { |
| /* use 1 byte of OUI and 3 bytes of NIC */ |
| u32 key = get_unaligned((u32 *)(addr + 2)); |
| |
| return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1); |
| } |
| |
| static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni) |
| { |
| if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) |
| return eth_vni_hash(mac, vni); |
| else |
| return eth_hash(mac); |
| } |
| |
| /* Hash chain to use given mac address */ |
| static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, |
| const u8 *mac, __be32 vni) |
| { |
| return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)]; |
| } |
| |
| /* Look up Ethernet address in forwarding table */ |
| static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, |
| const u8 *mac, __be32 vni) |
| { |
| struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni); |
| struct vxlan_fdb *f; |
| |
| hlist_for_each_entry_rcu(f, head, hlist) { |
| if (ether_addr_equal(mac, f->eth_addr)) { |
| if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { |
| if (vni == f->vni) |
| return f; |
| } else { |
| return f; |
| } |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, |
| const u8 *mac, __be32 vni) |
| { |
| struct vxlan_fdb *f; |
| |
| f = __vxlan_find_mac(vxlan, mac, vni); |
| if (f && f->used != jiffies) |
| 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, |
| __be32 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; |
| } |
| |
| int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, |
| struct switchdev_notifier_vxlan_fdb_info *fdb_info) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| u8 eth_addr[ETH_ALEN + 2] = { 0 }; |
| struct vxlan_rdst *rdst; |
| struct vxlan_fdb *f; |
| int rc = 0; |
| |
| if (is_multicast_ether_addr(mac) || |
| is_zero_ether_addr(mac)) |
| return -EINVAL; |
| |
| ether_addr_copy(eth_addr, mac); |
| |
| rcu_read_lock(); |
| |
| f = __vxlan_find_mac(vxlan, eth_addr, vni); |
| if (!f) { |
| rc = -ENOENT; |
| goto out; |
| } |
| |
| rdst = first_remote_rcu(f); |
| vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); |
| |
| out: |
| rcu_read_unlock(); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); |
| |
| static int vxlan_fdb_notify_one(struct notifier_block *nb, |
| const struct vxlan_dev *vxlan, |
| const struct vxlan_fdb *f, |
| const struct vxlan_rdst *rdst, |
| struct netlink_ext_ack *extack) |
| { |
| struct switchdev_notifier_vxlan_fdb_info fdb_info; |
| int rc; |
| |
| vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); |
| rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, |
| &fdb_info); |
| return notifier_to_errno(rc); |
| } |
| |
| int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, |
| struct notifier_block *nb, |
| struct netlink_ext_ack *extack) |
| { |
| struct vxlan_dev *vxlan; |
| struct vxlan_rdst *rdst; |
| struct vxlan_fdb *f; |
| unsigned int h; |
| int rc = 0; |
| |
| if (!netif_is_vxlan(dev)) |
| return -EINVAL; |
| vxlan = netdev_priv(dev); |
| |
| for (h = 0; h < FDB_HASH_SIZE; ++h) { |
| spin_lock_bh(&vxlan->hash_lock[h]); |
| hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) { |
| if (f->vni == vni) { |
| list_for_each_entry(rdst, &f->remotes, list) { |
| rc = vxlan_fdb_notify_one(nb, vxlan, |
| f, rdst, |
| extack); |
| if (rc) |
| goto unlock; |
| } |
| } |
| } |
| spin_unlock_bh(&vxlan->hash_lock[h]); |
| } |
| return 0; |
| |
| unlock: |
| spin_unlock_bh(&vxlan->hash_lock[h]); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(vxlan_fdb_replay); |
| |
| void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) |
| { |
| struct vxlan_dev *vxlan; |
| struct vxlan_rdst *rdst; |
| struct vxlan_fdb *f; |
| unsigned int h; |
| |
| if (!netif_is_vxlan(dev)) |
| return; |
| vxlan = netdev_priv(dev); |
| |
| for (h = 0; h < FDB_HASH_SIZE; ++h) { |
| spin_lock_bh(&vxlan->hash_lock[h]); |
| hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) |
| if (f->vni == vni) |
| list_for_each_entry(rdst, &f->remotes, list) |
| rdst->offloaded = false; |
| spin_unlock_bh(&vxlan->hash_lock[h]); |
| } |
| |
| } |
| EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); |
| |
| /* Replace destination of unicast mac */ |
| static int vxlan_fdb_replace(struct vxlan_fdb *f, |
| union vxlan_addr *ip, __be16 port, __be32 vni, |
| __u32 ifindex, struct vxlan_rdst *oldrd) |
| { |
| 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; |
| |
| *oldrd = *rd; |
| dst_cache_reset(&rd->dst_cache); |
| rd->remote_ip = *ip; |
| rd->remote_port = port; |
| rd->remote_vni = vni; |
| rd->remote_ifindex = ifindex; |
| rd->offloaded = false; |
| return 1; |
| } |
| |
| /* Add/update destinations for multicast */ |
| static int vxlan_fdb_append(struct vxlan_fdb *f, |
| union vxlan_addr *ip, __be16 port, __be32 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; |
| |
| if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) { |
| kfree(rd); |
| return -ENOBUFS; |
| } |
| |
| rd->remote_ip = *ip; |
| rd->remote_port = port; |
| rd->offloaded = false; |
| 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, |
| __be32 vni_field, |
| 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 = vxlan_rco_start(vni_field); |
| offset = start + vxlan_rco_offset(vni_field); |
| |
| 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 sock *sk, |
| struct list_head *head, |
| struct sk_buff *skb) |
| { |
| struct sk_buff *pp = NULL; |
| struct sk_buff *p; |
| struct vxlanhdr *vh, *vh2; |
| unsigned int hlen, off_vx; |
| int flush = 1; |
| struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk); |
| __be32 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 = 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), |
| vh->vx_vni, &grc, |
| !!(vs->flags & |
| VXLAN_F_REMCSUM_NOPARTIAL)); |
| |
| if (!vh) |
| goto out; |
| } |
| |
| skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ |
| |
| list_for_each_entry(p, head, list) { |
| 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); |
| flush = 0; |
| |
| out: |
| skb_gro_flush_final_remcsum(skb, pp, flush, &grc); |
| |
| return pp; |
| } |
| |
| static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) |
| { |
| /* Sets 'skb->inner_mac_header' since we are always called with |
| * 'skb->encapsulation' set. |
| */ |
| return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); |
| } |
| |
| static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac, |
| __u16 state, __be32 src_vni, |
| __u16 ndm_flags) |
| { |
| struct vxlan_fdb *f; |
| |
| f = kmalloc(sizeof(*f), GFP_ATOMIC); |
| if (!f) |
| return NULL; |
| f->state = state; |
| f->flags = ndm_flags; |
| f->updated = f->used = jiffies; |
| f->vni = src_vni; |
| f->nh = NULL; |
| RCU_INIT_POINTER(f->vdev, vxlan); |
| INIT_LIST_HEAD(&f->nh_list); |
| INIT_LIST_HEAD(&f->remotes); |
| memcpy(f->eth_addr, mac, ETH_ALEN); |
| |
| return f; |
| } |
| |
| static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, |
| __be32 src_vni, struct vxlan_fdb *f) |
| { |
| ++vxlan->addrcnt; |
| hlist_add_head_rcu(&f->hlist, |
| vxlan_fdb_head(vxlan, mac, src_vni)); |
| } |
| |
| static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, |
| u32 nhid, struct netlink_ext_ack *extack) |
| { |
| struct nexthop *old_nh = rtnl_dereference(fdb->nh); |
| struct nexthop *nh; |
| int err = -EINVAL; |
| |
| if (old_nh && old_nh->id == nhid) |
| return 0; |
| |
| nh = nexthop_find_by_id(vxlan->net, nhid); |
| if (!nh) { |
| NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); |
| goto err_inval; |
| } |
| |
| if (nh) { |
| if (!nexthop_get(nh)) { |
| NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); |
| nh = NULL; |
| goto err_inval; |
| } |
| if (!nexthop_is_fdb(nh)) { |
| NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop"); |
| goto err_inval; |
| } |
| |
| if (!nexthop_is_multipath(nh)) { |
| NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group"); |
| goto err_inval; |
| } |
| |
| /* check nexthop group family */ |
| switch (vxlan->default_dst.remote_ip.sa.sa_family) { |
| case AF_INET: |
| if (!nexthop_has_v4(nh)) { |
| err = -EAFNOSUPPORT; |
| NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); |
| goto err_inval; |
| } |
| break; |
| case AF_INET6: |
| if (nexthop_has_v4(nh)) { |
| err = -EAFNOSUPPORT; |
| NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); |
| goto err_inval; |
| } |
| } |
| } |
| |
| if (old_nh) { |
| list_del_rcu(&fdb->nh_list); |
| nexthop_put(old_nh); |
| } |
| rcu_assign_pointer(fdb->nh, nh); |
| list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list); |
| return 1; |
| |
| err_inval: |
| if (nh) |
| nexthop_put(nh); |
| return err; |
| } |
| |
| static int vxlan_fdb_create(struct vxlan_dev *vxlan, |
| const u8 *mac, union vxlan_addr *ip, |
| __u16 state, __be16 port, __be32 src_vni, |
| __be32 vni, __u32 ifindex, __u16 ndm_flags, |
| u32 nhid, struct vxlan_fdb **fdb, |
| struct netlink_ext_ack *extack) |
| { |
| struct vxlan_rdst *rd = NULL; |
| struct vxlan_fdb *f; |
| int rc; |
| |
| if (vxlan->cfg.addrmax && |
| vxlan->addrcnt >= vxlan->cfg.addrmax) |
| return -ENOSPC; |
| |
| netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); |
| f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); |
| if (!f) |
| return -ENOMEM; |
| |
| if (nhid) |
| rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); |
| else |
| rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); |
| if (rc < 0) |
| goto errout; |
| |
| *fdb = f; |
| |
| return 0; |
| |
| errout: |
| kfree(f); |
| return rc; |
| } |
| |
| static void __vxlan_fdb_free(struct vxlan_fdb *f) |
| { |
| struct vxlan_rdst *rd, *nd; |
| struct nexthop *nh; |
| |
| nh = rcu_dereference_raw(f->nh); |
| if (nh) { |
| rcu_assign_pointer(f->nh, NULL); |
| rcu_assign_pointer(f->vdev, NULL); |
| nexthop_put(nh); |
| } |
| |
| list_for_each_entry_safe(rd, nd, &f->remotes, list) { |
| dst_cache_destroy(&rd->dst_cache); |
| kfree(rd); |
| } |
| kfree(f); |
| } |
| |
| static void vxlan_fdb_free(struct rcu_head *head) |
| { |
| struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); |
| |
| __vxlan_fdb_free(f); |
| } |
| |
| static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, |
| bool do_notify, bool swdev_notify) |
| { |
| struct vxlan_rdst *rd; |
| |
| netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); |
| |
| --vxlan->addrcnt; |
| if (do_notify) { |
| if (rcu_access_pointer(f->nh)) |
| vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH, |
| swdev_notify, NULL); |
| else |
| list_for_each_entry(rd, &f->remotes, list) |
| vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, |
| swdev_notify, NULL); |
| } |
| |
| hlist_del_rcu(&f->hlist); |
| list_del_rcu(&f->nh_list); |
| call_rcu(&f->rcu, vxlan_fdb_free); |
| } |
| |
| static void vxlan_dst_free(struct rcu_head *head) |
| { |
| struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); |
| |
| dst_cache_destroy(&rd->dst_cache); |
| kfree(rd); |
| } |
| |
| static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, |
| union vxlan_addr *ip, |
| __u16 state, __u16 flags, |
| __be16 port, __be32 vni, |
| __u32 ifindex, __u16 ndm_flags, |
| struct vxlan_fdb *f, u32 nhid, |
| bool swdev_notify, |
| struct netlink_ext_ack *extack) |
| { |
| __u16 fdb_flags = (ndm_flags & ~NTF_USE); |
| struct vxlan_rdst *rd = NULL; |
| struct vxlan_rdst oldrd; |
| int notify = 0; |
| int rc = 0; |
| int err; |
| |
| if (nhid && !rcu_access_pointer(f->nh)) { |
| NL_SET_ERR_MSG(extack, |
| "Cannot replace an existing non nexthop fdb with a nexthop"); |
| return -EOPNOTSUPP; |
| } |
| |
| if (nhid && (flags & NLM_F_APPEND)) { |
| NL_SET_ERR_MSG(extack, |
| "Cannot append to a nexthop fdb"); |
| return -EOPNOTSUPP; |
| } |
| |
| /* Do not allow an externally learned entry to take over an entry added |
| * by the user. |
| */ |
| if (!(fdb_flags & NTF_EXT_LEARNED) || |
| !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { |
| if (f->state != state) { |
| f->state = state; |
| f->updated = jiffies; |
| notify = 1; |
| } |
| if (f->flags != fdb_flags) { |
| f->flags = fdb_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))) { |
| if (nhid) { |
| rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); |
| if (rc < 0) |
| return rc; |
| } else { |
| rc = vxlan_fdb_replace(f, ip, port, vni, |
| ifindex, &oldrd); |
| } |
| notify |= rc; |
| } else { |
| NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries"); |
| return -EOPNOTSUPP; |
| } |
| } |
| if ((flags & NLM_F_APPEND) && |
| (is_multicast_ether_addr(f->eth_addr) || |
| is_zero_ether_addr(f->eth_addr))) { |
| rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); |
| |
| if (rc < 0) |
| return rc; |
| notify |= rc; |
| } |
| |
| if (ndm_flags & NTF_USE) |
| f->used = jiffies; |
| |
| if (notify) { |
| if (rd == NULL) |
| rd = first_remote_rtnl(f); |
| |
| err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, |
| swdev_notify, extack); |
| if (err) |
| goto err_notify; |
| } |
| |
| return 0; |
| |
| err_notify: |
| if (nhid) |
| return err; |
| if ((flags & NLM_F_REPLACE) && rc) |
| *rd = oldrd; |
| else if ((flags & NLM_F_APPEND) && rc) { |
| list_del_rcu(&rd->list); |
| call_rcu(&rd->rcu, vxlan_dst_free); |
| } |
| return err; |
| } |
| |
| static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, |
| const u8 *mac, union vxlan_addr *ip, |
| __u16 state, __u16 flags, |
| __be16 port, __be32 src_vni, __be32 vni, |
| __u32 ifindex, __u16 ndm_flags, u32 nhid, |
| bool swdev_notify, |
| struct netlink_ext_ack *extack) |
| { |
| __u16 fdb_flags = (ndm_flags & ~NTF_USE); |
| struct vxlan_fdb *f; |
| int rc; |
| |
| /* 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); |
| rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, |
| vni, ifindex, fdb_flags, nhid, &f, extack); |
| if (rc < 0) |
| return rc; |
| |
| vxlan_fdb_insert(vxlan, mac, src_vni, f); |
| rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, |
| swdev_notify, extack); |
| if (rc) |
| goto err_notify; |
| |
| return 0; |
| |
| err_notify: |
| vxlan_fdb_destroy(vxlan, f, false, false); |
| return rc; |
| } |
| |
| /* Add new entry to forwarding table -- assumes lock held */ |
| static int vxlan_fdb_update(struct vxlan_dev *vxlan, |
| const u8 *mac, union vxlan_addr *ip, |
| __u16 state, __u16 flags, |
| __be16 port, __be32 src_vni, __be32 vni, |
| __u32 ifindex, __u16 ndm_flags, u32 nhid, |
| bool swdev_notify, |
| struct netlink_ext_ack *extack) |
| { |
| struct vxlan_fdb *f; |
| |
| f = __vxlan_find_mac(vxlan, mac, src_vni); |
| if (f) { |
| if (flags & NLM_F_EXCL) { |
| netdev_dbg(vxlan->dev, |
| "lost race to create %pM\n", mac); |
| return -EEXIST; |
| } |
| |
| return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, |
| vni, ifindex, ndm_flags, f, |
| nhid, swdev_notify, extack); |
| } else { |
| if (!(flags & NLM_F_CREATE)) |
| return -ENOENT; |
| |
| return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, |
| port, src_vni, vni, ifindex, |
| ndm_flags, nhid, swdev_notify, |
| extack); |
| } |
| } |
| |
| static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, |
| struct vxlan_rdst *rd, bool swdev_notify) |
| { |
| list_del_rcu(&rd->list); |
| vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); |
| call_rcu(&rd->rcu, vxlan_dst_free); |
| } |
| |
| static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, |
| union vxlan_addr *ip, __be16 *port, __be32 *src_vni, |
| __be32 *vni, u32 *ifindex, u32 *nhid) |
| { |
| struct net *net = dev_net(vxlan->dev); |
| int err; |
| |
| if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || |
| tb[NDA_PORT])) |
| return -EINVAL; |
| |
| 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 = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); |
| } else { |
| *vni = vxlan->default_dst.remote_vni; |
| } |
| |
| if (tb[NDA_SRC_VNI]) { |
| if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) |
| return -EINVAL; |
| *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); |
| } else { |
| *src_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; |
| } |
| |
| if (tb[NDA_NH_ID]) |
| *nhid = nla_get_u32(tb[NDA_NH_ID]); |
| else |
| *nhid = 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 netlink_ext_ack *extack) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| /* struct net *net = dev_net(vxlan->dev); */ |
| union vxlan_addr ip; |
| __be16 port; |
| __be32 src_vni, vni; |
| u32 ifindex, nhid; |
| u32 hash_index; |
| 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 || (!tb[NDA_DST] && !tb[NDA_NH_ID])) |
| return -EINVAL; |
| |
| err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, |
| &nhid); |
| if (err) |
| return err; |
| |
| if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) |
| return -EAFNOSUPPORT; |
| |
| hash_index = fdb_head_index(vxlan, addr, src_vni); |
| spin_lock_bh(&vxlan->hash_lock[hash_index]); |
| err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, |
| port, src_vni, vni, ifindex, |
| ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, |
| nhid, true, extack); |
| spin_unlock_bh(&vxlan->hash_lock[hash_index]); |
| |
| return err; |
| } |
| |
| static int __vxlan_fdb_delete(struct vxlan_dev *vxlan, |
| const unsigned char *addr, union vxlan_addr ip, |
| __be16 port, __be32 src_vni, __be32 vni, |
| u32 ifindex, bool swdev_notify) |
| { |
| struct vxlan_rdst *rd = NULL; |
| struct vxlan_fdb *f; |
| int err = -ENOENT; |
| |
| f = vxlan_find_mac(vxlan, addr, src_vni); |
| if (!f) |
| return err; |
| |
| if (!vxlan_addr_any(&ip)) { |
| rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); |
| if (!rd) |
| goto out; |
| } |
| |
| /* 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)) { |
| vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); |
| goto out; |
| } |
| |
| vxlan_fdb_destroy(vxlan, f, true, swdev_notify); |
| |
| out: |
| return 0; |
| } |
| |
| /* 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); |
| union vxlan_addr ip; |
| __be32 src_vni, vni; |
| u32 ifindex, nhid; |
| u32 hash_index; |
| __be16 port; |
| int err; |
| |
| err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, |
| &nhid); |
| if (err) |
| return err; |
| |
| hash_index = fdb_head_index(vxlan, addr, src_vni); |
| spin_lock_bh(&vxlan->hash_lock[hash_index]); |
| err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, |
| true); |
| spin_unlock_bh(&vxlan->hash_lock[hash_index]); |
| |
| 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; |
| int err = 0; |
| |
| for (h = 0; h < FDB_HASH_SIZE; ++h) { |
| struct vxlan_fdb *f; |
| |
| hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { |
| struct vxlan_rdst *rd; |
| |
| if (rcu_access_pointer(f->nh)) { |
| err = vxlan_fdb_info(skb, vxlan, f, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| RTM_NEWNEIGH, |
| NLM_F_MULTI, NULL); |
| if (err < 0) |
| goto out; |
| continue; |
| } |
| |
| list_for_each_entry_rcu(rd, &f->remotes, list) { |
| if (*idx < cb->args[2]) |
| 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 += 1; |
| } |
| } |
| } |
| out: |
| return err; |
| } |
| |
| static int vxlan_fdb_get(struct sk_buff *skb, |
| struct nlattr *tb[], |
| struct net_device *dev, |
| const unsigned char *addr, |
| u16 vid, u32 portid, u32 seq, |
| struct netlink_ext_ack *extack) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_fdb *f; |
| __be32 vni; |
| int err; |
| |
| if (tb[NDA_VNI]) |
| vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); |
| else |
| vni = vxlan->default_dst.remote_vni; |
| |
| rcu_read_lock(); |
| |
| f = __vxlan_find_mac(vxlan, addr, vni); |
| if (!f) { |
| NL_SET_ERR_MSG(extack, "Fdb entry not found"); |
| err = -ENOENT; |
| goto errout; |
| } |
| |
| err = vxlan_fdb_info(skb, vxlan, f, portid, seq, |
| RTM_NEWNEIGH, 0, first_remote_rcu(f)); |
| errout: |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| /* 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, |
| u32 src_ifindex, __be32 vni) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| struct vxlan_fdb *f; |
| u32 ifindex = 0; |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (src_ip->sa.sa_family == AF_INET6 && |
| (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) |
| ifindex = src_ifindex; |
| #endif |
| |
| f = vxlan_find_mac(vxlan, src_mac, vni); |
| if (likely(f)) { |
| struct vxlan_rdst *rdst = first_remote_rcu(f); |
| |
| if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && |
| rdst->remote_ifindex == ifindex)) |
| return false; |
| |
| /* Don't migrate static entries, drop packets */ |
| if (f->state & (NUD_PERMANENT | NUD_NOARP)) |
| return true; |
| |
| /* Don't override an fdb with nexthop with a learnt entry */ |
| if (rcu_access_pointer(f->nh)) |
| 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, true, NULL); |
| } else { |
| u32 hash_index = fdb_head_index(vxlan, src_mac, vni); |
| |
| /* learned new entry */ |
| spin_lock(&vxlan->hash_lock[hash_index]); |
| |
| /* close off race between vxlan_flush and incoming packets */ |
| if (netif_running(dev)) |
| vxlan_fdb_update(vxlan, src_mac, src_ip, |
| NUD_REACHABLE, |
| NLM_F_EXCL|NLM_F_CREATE, |
| vxlan->cfg.dst_port, |
| vni, |
| vxlan->default_dst.remote_vni, |
| ifindex, NTF_SELF, 0, true, NULL); |
| spin_unlock(&vxlan->hash_lock[hash_index]); |
| } |
| |
| 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; |
| struct vxlan_sock *sock4; |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct vxlan_sock *sock6; |
| #endif |
| unsigned short family = dev->default_dst.remote_ip.sa.sa_family; |
| |
| sock4 = rtnl_dereference(dev->vn4_sock); |
| |
| /* The vxlan_sock is only used by dev, leaving group has |
| * no effect on other vxlan devices. |
| */ |
| if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1) |
| return false; |
| #if IS_ENABLED(CONFIG_IPV6) |
| sock6 = rtnl_dereference(dev->vn6_sock); |
| if (family == AF_INET6 && sock6 && refcount_read(&sock6->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 && |
| rtnl_dereference(vxlan->vn4_sock) != sock4) |
| continue; |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (family == AF_INET6 && |
| rtnl_dereference(vxlan->vn6_sock) != sock6) |
| 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 bool __vxlan_sock_release_prep(struct vxlan_sock *vs) |
| { |
| struct vxlan_net *vn; |
| |
| if (!vs) |
| return false; |
| if (!refcount_dec_and_test(&vs->refcnt)) |
| return false; |
| |
| vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); |
| spin_lock(&vn->sock_lock); |
| hlist_del_rcu(&vs->hlist); |
| udp_tunnel_notify_del_rx_port(vs->sock, |
| (vs->flags & VXLAN_F_GPE) ? |
| UDP_TUNNEL_TYPE_VXLAN_GPE : |
| UDP_TUNNEL_TYPE_VXLAN); |
| spin_unlock(&vn->sock_lock); |
| |
| return true; |
| } |
| |
| static void vxlan_sock_release(struct vxlan_dev *vxlan) |
| { |
| struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); |
| |
| RCU_INIT_POINTER(vxlan->vn6_sock, NULL); |
| #endif |
| |
| RCU_INIT_POINTER(vxlan->vn4_sock, NULL); |
| synchronize_net(); |
| |
| vxlan_vs_del_dev(vxlan); |
| |
| if (__vxlan_sock_release_prep(sock4)) { |
| udp_tunnel_sock_release(sock4->sock); |
| kfree(sock4); |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (__vxlan_sock_release_prep(sock6)) { |
| udp_tunnel_sock_release(sock6->sock); |
| kfree(sock6); |
| } |
| #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 vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); |
| struct ip_mreqn mreq = { |
| .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr, |
| .imr_ifindex = ifindex, |
| }; |
| |
| sk = sock4->sock->sk; |
| lock_sock(sk); |
| ret = ip_mc_join_group(sk, &mreq); |
| release_sock(sk); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); |
| |
| sk = sock6->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 vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); |
| struct ip_mreqn mreq = { |
| .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr, |
| .imr_ifindex = ifindex, |
| }; |
| |
| sk = sock4->sock->sk; |
| lock_sock(sk); |
| ret = ip_mc_leave_group(sk, &mreq); |
| release_sock(sk); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); |
| |
| sk = sock6->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 bool vxlan_remcsum(struct vxlanhdr *unparsed, |
| struct sk_buff *skb, u32 vxflags) |
| { |
| size_t start, offset; |
| |
| if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) |
| goto out; |
| |
| start = vxlan_rco_start(unparsed->vx_vni); |
| offset = start + vxlan_rco_offset(unparsed->vx_vni); |
| |
| if (!pskb_may_pull(skb, offset + sizeof(u16))) |
| return false; |
| |
| skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, |
| !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); |
| out: |
| unparsed->vx_flags &= ~VXLAN_HF_RCO; |
| unparsed->vx_vni &= VXLAN_VNI_MASK; |
| return true; |
| } |
| |
| static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed, |
| struct sk_buff *skb, u32 vxflags, |
| struct vxlan_metadata *md) |
| { |
| struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed; |
| struct metadata_dst *tun_dst; |
| |
| if (!(unparsed->vx_flags & VXLAN_HF_GBP)) |
| goto out; |
| |
| md->gbp = ntohs(gbp->policy_id); |
| |
| tun_dst = (struct metadata_dst *)skb_dst(skb); |
| 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; |
| |
| /* In flow-based mode, GBP is carried in dst_metadata */ |
| if (!(vxflags & VXLAN_F_COLLECT_METADATA)) |
| skb->mark = md->gbp; |
| out: |
| unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS; |
| } |
| |
| static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed, |
| __be16 *protocol, |
| struct sk_buff *skb, u32 vxflags) |
| { |
| struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed; |
| |
| /* Need to have Next Protocol set for interfaces in GPE mode. */ |
| if (!gpe->np_applied) |
| return false; |
| /* "The initial version is 0. If a receiver does not support the |
| * version indicated it MUST drop the packet. |
| */ |
| if (gpe->version != 0) |
| return false; |
| /* "When the O bit is set to 1, the packet is an OAM packet and OAM |
| * processing MUST occur." However, we don't implement OAM |
| * processing, thus drop the packet. |
| */ |
| if (gpe->oam_flag) |
| return false; |
| |
| *protocol = tun_p_to_eth_p(gpe->next_protocol); |
| if (!*protocol) |
| return false; |
| |
| unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS; |
| return true; |
| } |
| |
| static bool vxlan_set_mac(struct vxlan_dev *vxlan, |
| struct vxlan_sock *vs, |
| struct sk_buff *skb, __be32 vni) |
| { |
| union vxlan_addr saddr; |
| u32 ifindex = skb->dev->ifindex; |
| |
| skb_reset_mac_header(skb); |
| 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)) |
| return false; |
| |
| /* Get address from the outer IP header */ |
| if (vxlan_get_sk_family(vs) == AF_INET) { |
| saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; |
| saddr.sa.sa_family = AF_INET; |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; |
| saddr.sa.sa_family = AF_INET6; |
| #endif |
| } |
| |
| if ((vxlan->cfg.flags & VXLAN_F_LEARN) && |
| vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, |
| struct sk_buff *skb) |
| { |
| int err = 0; |
| |
| if (vxlan_get_sk_family(vs) == AF_INET) |
| err = IP_ECN_decapsulate(oiph, skb); |
| #if IS_ENABLED(CONFIG_IPV6) |
| else |
| err = IP6_ECN_decapsulate(oiph, skb); |
| #endif |
| |
| if (unlikely(err) && log_ecn_error) { |
| if (vxlan_get_sk_family(vs) == AF_INET) |
| net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
| &((struct iphdr *)oiph)->saddr, |
| ((struct iphdr *)oiph)->tos); |
| else |
| net_info_ratelimited("non-ECT from %pI6\n", |
| &((struct ipv6hdr *)oiph)->saddr); |
| } |
| return err <= 1; |
| } |
| |
| /* Callback from net/ipv4/udp.c to receive packets */ |
| static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) |
| { |
| struct pcpu_sw_netstats *stats; |
| struct vxlan_dev *vxlan; |
| struct vxlan_sock *vs; |
| struct vxlanhdr unparsed; |
| struct vxlan_metadata _md; |
| struct vxlan_metadata *md = &_md; |
| __be16 protocol = htons(ETH_P_TEB); |
| bool raw_proto = false; |
| void *oiph; |
| __be32 vni = 0; |
| |
| /* Need UDP and VXLAN header to be present */ |
| if (!pskb_may_pull(skb, VXLAN_HLEN)) |
| goto drop; |
| |
| unparsed = *vxlan_hdr(skb); |
| /* VNI flag always required to be set */ |
| if (!(unparsed.vx_flags & VXLAN_HF_VNI)) { |
| netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", |
| ntohl(vxlan_hdr(skb)->vx_flags), |
| ntohl(vxlan_hdr(skb)->vx_vni)); |
| /* Return non vxlan pkt */ |
| goto drop; |
| } |
| unparsed.vx_flags &= ~VXLAN_HF_VNI; |
| unparsed.vx_vni &= ~VXLAN_VNI_MASK; |
| |
| vs = rcu_dereference_sk_user_data(sk); |
| if (!vs) |
| goto drop; |
| |
| vni = vxlan_vni(vxlan_hdr(skb)->vx_vni); |
| |
| vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni); |
| if (!vxlan) |
| goto drop; |
| |
| /* For backwards compatibility, only allow reserved fields to be |
| * used by VXLAN extensions if explicitly requested. |
| */ |
| if (vs->flags & VXLAN_F_GPE) { |
| if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags)) |
| goto drop; |
| raw_proto = true; |
| } |
| |
| if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, |
| !net_eq(vxlan->net, dev_net(vxlan->dev)))) |
| goto drop; |
| |
| if (vxlan_collect_metadata(vs)) { |
| struct metadata_dst *tun_dst; |
| |
| tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY, |
| key32_to_tunnel_id(vni), sizeof(*md)); |
| |
| if (!tun_dst) |
| goto drop; |
| |
| md = ip_tunnel_info_opts(&tun_dst->u.tun_info); |
| |
| skb_dst_set(skb, (struct dst_entry *)tun_dst); |
| } else { |
| memset(md, 0, sizeof(*md)); |
| } |
| |
| if (vs->flags & VXLAN_F_REMCSUM_RX) |
| if (!vxlan_remcsum(&unparsed, skb, vs->flags)) |
| goto drop; |
| if (vs->flags & VXLAN_F_GBP) |
| vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md); |
| /* Note that GBP and GPE can never be active together. This is |
| * ensured in vxlan_dev_configure. |
| */ |
| |
| if (unparsed.vx_flags || unparsed.vx_vni) { |
| /* 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 drop; |
| } |
| |
| if (!raw_proto) { |
| if (!vxlan_set_mac(vxlan, vs, skb, vni)) |
| goto drop; |
| } else { |
| skb_reset_mac_header(skb); |
| skb->dev = vxlan->dev; |
| skb->pkt_type = PACKET_HOST; |
| } |
| |
| oiph = skb_network_header(skb); |
| skb_reset_network_header(skb); |
| |
| if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { |
| ++vxlan->dev->stats.rx_frame_errors; |
| ++vxlan->dev->stats.rx_errors; |
| goto drop; |
| } |
| |
| rcu_read_lock(); |
| |
| if (unlikely(!(vxlan->dev->flags & IFF_UP))) { |
| rcu_read_unlock(); |
| atomic_long_inc(&vxlan->dev->rx_dropped); |
| 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); |
| |
| rcu_read_unlock(); |
| |
| return 0; |
| |
| drop: |
| /* Consume bad packet */ |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */ |
| static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) |
| { |
| struct vxlan_dev *vxlan; |
| struct vxlan_sock *vs; |
| struct vxlanhdr *hdr; |
| __be32 vni; |
| |
| if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) |
| return -EINVAL; |
| |
| hdr = vxlan_hdr(skb); |
| |
| if (!(hdr->vx_flags & VXLAN_HF_VNI)) |
| return -EINVAL; |
| |
| vs = rcu_dereference_sk_user_data(sk); |
| if (!vs) |
| return -ENOENT; |
| |
| vni = vxlan_vni(hdr->vx_vni); |
| vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni); |
| if (!vxlan) |
| return -ENOENT; |
| |
| return 0; |
| } |
| |
| static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) |
| { |
| 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, vni); |
| 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->cfg.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 || !pskb_may_pull(request, request->len)) |
| 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_reset_mac_header(reply); |
| |
| ns = (struct nd_msg *)(ipv6_hdr(request) + 1); |
| |
| daddr = eth_hdr(request)->h_source; |
| ns_olen = request->len - skb_network_offset(request) - |
| sizeof(struct ipv6hdr) - sizeof(*ns); |
| for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { |
| if (!ns->opt[i + 1]) { |
| kfree_skb(reply); |
| return NULL; |
| } |
| 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_reset_network_header(reply); |
| 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_reset_transport_header(reply); |
| |
| /* Neighbor Advertisement */ |
| na = skb_put_zero(reply, 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, __be32 vni) |
| { |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| const struct in6_addr *daddr; |
| const struct ipv6hdr *iphdr; |
| struct inet6_dev *in6_dev; |
| struct neighbour *n; |
| struct nd_msg *msg; |
| |
| in6_dev = __in6_dev_get(dev); |
| if (!in6_dev) |
| goto out; |
| |
| iphdr = ipv6_hdr(skb); |
| daddr = &iphdr->daddr; |
| msg = (struct nd_msg *)(iphdr + 1); |
| |
| 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, vni); |
| 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->cfg.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->cfg.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->cfg.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 |= 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); |
| } |
| |
| static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags, |
| __be16 protocol) |
| { |
| struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; |
| |
| gpe->np_applied = 1; |
| gpe->next_protocol = tun_p_from_eth_p(protocol); |
| if (!gpe->next_protocol) |
| return -EPFNOSUPPORT; |
| return 0; |
| } |
| |
| static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, |
| int iphdr_len, __be32 vni, |
| struct vxlan_metadata *md, u32 vxflags, |
| bool udp_sum) |
| { |
| struct vxlanhdr *vxh; |
| int min_headroom; |
| int err; |
| int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; |
| __be16 inner_protocol = htons(ETH_P_TEB); |
| |
| 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))) |
| type |= SKB_GSO_TUNNEL_REMCSUM; |
| } |
| |
| min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len |
| + VXLAN_HLEN + iphdr_len; |
| |
| /* Need space for new headers (invalidates iph ptr) */ |
| err = skb_cow_head(skb, min_headroom); |
| if (unlikely(err)) |
| return err; |
| |
| err = iptunnel_handle_offloads(skb, type); |
| if (err) |
| return err; |
| |
| vxh = __skb_push(skb, sizeof(*vxh)); |
| vxh->vx_flags = VXLAN_HF_VNI; |
| vxh->vx_vni = vxlan_vni_field(vni); |
| |
| if (type & SKB_GSO_TUNNEL_REMCSUM) { |
| unsigned int start; |
| |
| start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); |
| vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); |
| vxh->vx_flags |= 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); |
| if (vxflags & VXLAN_F_GPE) { |
| err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol); |
| if (err < 0) |
| return err; |
| inner_protocol = skb->protocol; |
| } |
| |
| skb_set_inner_protocol(skb, inner_protocol); |
| return 0; |
| } |
| |
| static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev, |
| struct vxlan_sock *sock4, |
| struct sk_buff *skb, int oif, u8 tos, |
| __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport, |
| struct dst_cache *dst_cache, |
| const struct ip_tunnel_info *info) |
| { |
| bool use_cache = ip_tunnel_dst_cache_usable(skb, info); |
| struct rtable *rt = NULL; |
| struct flowi4 fl4; |
| |
| if (!sock4) |
| return ERR_PTR(-EIO); |
| |
| if (tos && !info) |
| use_cache = false; |
| if (use_cache) { |
| rt = dst_cache_get_ip4(dst_cache, saddr); |
| if (rt) |
| return rt; |
| } |
| |
| memset(&fl4, 0, sizeof(fl4)); |
| fl4.flowi4_oif = oif; |
| fl4.flowi4_tos = RT_TOS(tos); |
| fl4.flowi4_mark = skb->mark; |
| fl4.flowi4_proto = IPPROTO_UDP; |
| fl4.daddr = daddr; |
| fl4.saddr = *saddr; |
| fl4.fl4_dport = dport; |
| fl4.fl4_sport = sport; |
| |
| rt = ip_route_output_key(vxlan->net, &fl4); |
| if (!IS_ERR(rt)) { |
| if (rt->dst.dev == dev) { |
| netdev_dbg(dev, "circular route to %pI4\n", &daddr); |
| ip_rt_put(rt); |
| return ERR_PTR(-ELOOP); |
| } |
| |
| *saddr = fl4.saddr; |
| if (use_cache) |
| dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr); |
| } else { |
| netdev_dbg(dev, "no route to %pI4\n", &daddr); |
| return ERR_PTR(-ENETUNREACH); |
| } |
| return rt; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan, |
| struct net_device *dev, |
| struct vxlan_sock *sock6, |
| struct sk_buff *skb, int oif, u8 tos, |
| __be32 label, |
| const struct in6_addr *daddr, |
| struct in6_addr *saddr, |
| __be16 dport, __be16 sport, |
| struct dst_cache *dst_cache, |
| const struct ip_tunnel_info *info) |
| { |
| bool use_cache = ip_tunnel_dst_cache_usable(skb, info); |
| struct dst_entry *ndst; |
| struct flowi6 fl6; |
| |
| if (!sock6) |
| return ERR_PTR(-EIO); |
| |
| if (tos && !info) |
| use_cache = false; |
| if (use_cache) { |
| ndst = dst_cache_get_ip6(dst_cache, saddr); |
| if (ndst) |
| return ndst; |
| } |
| |
| memset(&fl6, 0, sizeof(fl6)); |
| fl6.flowi6_oif = oif; |
| fl6.daddr = *daddr; |
| fl6.saddr = *saddr; |
| fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label); |
| fl6.flowi6_mark = skb->mark; |
| fl6.flowi6_proto = IPPROTO_UDP; |
| fl6.fl6_dport = dport; |
| fl6.fl6_sport = sport; |
| |
| ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk, |
| &fl6, NULL); |
| if (unlikely(IS_ERR(ndst))) { |
| netdev_dbg(dev, "no route to %pI6\n", daddr); |
| return ERR_PTR(-ENETUNREACH); |
| } |
| |
| if (unlikely(ndst->dev == dev)) { |
| netdev_dbg(dev, "circular route to %pI6\n", daddr); |
| dst_release(ndst); |
| return ERR_PTR(-ELOOP); |
| } |
| |
| *saddr = fl6.saddr; |
| if (use_cache) |
| dst_cache_set_ip6(dst_cache, ndst, 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, __be32 vni) |
| { |
| 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; |
| 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 |
| } |
| |
| rcu_read_lock(); |
| dev = skb->dev; |
| if (unlikely(!(dev->flags & IFF_UP))) { |
| kfree_skb(skb); |
| goto drop; |
| } |
| |
| if (dst_vxlan->cfg.flags & VXLAN_F_LEARN) |
| vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); |
| |
| 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 { |
| drop: |
| dev->stats.rx_dropped++; |
| } |
| rcu_read_unlock(); |
| } |
| |
| static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, |
| struct vxlan_dev *vxlan, |
| union vxlan_addr *daddr, |
| __be16 dst_port, int dst_ifindex, __be32 vni, |
| struct dst_entry *dst, |
| u32 rt_flags) |
| { |
| #if IS_ENABLED(CONFIG_IPV6) |
| /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of |
| * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple |
| * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. |
| */ |
| BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); |
| #endif |
| /* Bypass encapsulation if the destination is local */ |
| if (rt_flags & RTCF_LOCAL && |
| !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { |
| struct vxlan_dev *dst_vxlan; |
| |
| dst_release(dst); |
| dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, |
| daddr->sa.sa_family, dst_port, |
| vxlan->cfg.flags); |
| if (!dst_vxlan) { |
| dev->stats.tx_errors++; |
| kfree_skb(skb); |
| |
| return -ENOENT; |
| } |
| vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, |
| __be32 default_vni, struct vxlan_rdst *rdst, |
| bool did_rsc) |
| { |
| struct dst_cache *dst_cache; |
| struct ip_tunnel_info *info; |
| struct vxlan_dev *vxlan = netdev_priv(dev); |
| const struct iphdr *old_iph = ip_hdr(skb); |
| union vxlan_addr *dst; |
| union vxlan_addr remote_ip, local_ip; |
| struct vxlan_metadata _md; |
| struct vxlan_metadata *md = &_md; |
| __be16 src_port = 0, dst_port; |
| struct dst_entry *ndst = NULL; |
| __be32 vni, label; |
| __u8 tos, ttl; |
| int ifindex; |
| int err; |
| u32 flags = vxlan->cfg.flags; |
| bool udp_sum = false; |
| bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); |
| |
| info = skb_tunnel_info(skb); |
| |
| if (rdst) { |
| dst = &rdst->remote_ip; |
| if (vxlan_addr_any(dst)) { |
| if (did_rsc) { |
| /* short-circuited back to local bridge */ |
| vxlan_encap_bypass(skb, vxlan, vxlan, default_vni); |
| return; |
| } |
| goto drop; |
| } |
| |
| dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; |
| vni = (rdst->remote_vni) ? : default_vni; |
| ifindex = rdst->remote_ifindex; |
| local_ip = vxlan->cfg.saddr; |
| dst_cache = &rdst->dst_cache; |
| md->gbp = skb->mark; |
| if (flags & VXLAN_F_TTL_INHERIT) { |
| ttl = ip_tunnel_get_ttl(old_iph, skb); |
| } else { |
| 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); |
| |
| if (dst->sa.sa_family == AF_INET) |
| udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); |
| else |
| udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); |
| label = vxlan->cfg.label; |
| } else { |
| if (!info) { |
| WARN_ONCE(1, "%s: Missing encapsulation instructions\n", |
| dev->name); |
| goto drop; |
| } |
| 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; |
| local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src; |
| } else { |
| remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst; |
| local_ip.sin6.sin6_addr = info->key.u.ipv6.src; |
| } |
| dst = &remote_ip; |
| dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; |
| vni = tunnel_id_to_key32(info->key.tun_id); |
| ifindex = 0; |
| dst_cache = &info->dst_cache; |
| if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { |
| if (info->options_len < sizeof(*md)) |
| goto drop; |
| md = ip_tunnel_info_opts(info); |
| } |
| ttl = info->key.ttl; |
| tos = info->key.tos; |
| label = info->key.label; |
| udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); |
| } |
| src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, |
| vxlan->cfg.port_max, true); |
| |
| rcu_read_lock(); |
| if (dst->sa.sa_family == AF_INET) { |
| struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); |
| struct rtable *rt; |
| __be16 df = 0; |
| |
| if (!ifindex) |
| ifindex = sock4->sock->sk->sk_bound_dev_if; |
| |
| rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos, |
| dst->sin.sin_addr.s_addr, |
| &local_ip.sin.sin_addr.s_addr, |
| dst_port, src_port, |
| dst_cache, info); |
| if (IS_ERR(rt)) { |
| err = PTR_ERR(rt); |
| goto tx_error; |
| } |
| |
| if (!info) { |
| /* Bypass encapsulation if the destination is local */ |
| err = encap_bypass_if_local(skb, dev, vxlan, dst, |
| dst_port, ifindex, vni, |
| &rt->dst, rt->rt_flags); |
| if (err) |
| goto out_unlock; |
| |
| if (vxlan->cfg.df == VXLAN_DF_SET) { |
| df = htons(IP_DF); |
| } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { |
| struct ethhdr *eth = eth_hdr(skb); |
| |
| if (ntohs(eth->h_proto) == ETH_P_IPV6 || |
| (ntohs(eth->h_proto) == ETH_P_IP && |
| old_iph->frag_off & htons(IP_DF))) |
| df = htons(IP_DF); |
| } |
| } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) { |
| df = htons(IP_DF); |
| } |
| |
| ndst = &rt->dst; |
| skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM); |
| |
| tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb); |
| ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
| err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), |
| vni, md, flags, udp_sum); |
| if (err < 0) |
| goto tx_error; |
| |
| udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr, |
| dst->sin.sin_addr.s_addr, tos, ttl, df, |
| src_port, dst_port, xnet, !udp_sum); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); |
| |
| if (!ifindex) |
| ifindex = sock6->sock->sk->sk_bound_dev_if; |
| |
| ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos, |
| label, &dst->sin6.sin6_addr, |
| &local_ip.sin6.sin6_addr, |
| dst_port, src_port, |
| dst_cache, info); |
| if (IS_ERR(ndst)) { |
| err = PTR_ERR(ndst); |
| ndst = NULL; |
| goto tx_error; |
| } |
| |
| if (!info) { |
| u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags; |
| |
| err = encap_bypass_if_local(skb, dev, vxlan, dst, |
| dst_port, ifindex, vni, |
| ndst, rt6i_flags); |
| if (err) |
| goto out_unlock; |
| } |
| |
| skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM); |
| |
| tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb); |
| ttl = ttl ? : ip6_dst_hoplimit(ndst); |
| skb_scrub_packet(skb, xnet); |
| err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), |
| vni, md, flags, udp_sum); |
| if (err < 0) |
| goto tx_error; |
| |
| udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev, |
| &local_ip.sin6.sin6_addr, |
| &dst->sin6.sin6_addr, tos, ttl, |
| label, src_port, dst_port, !udp_sum); |
| #endif |
| } |
| out_unlock: |
| rcu_read_unlock(); |
| return; |
| |
| drop: |
| dev->stats.tx_dropped++; |
| dev_kfree_skb(skb); |
| return; |
| |
| tx_error: |
| rcu_read_unlock(); |
| if (err == -ELOOP) |
| dev->stats.collisions++; |
| else if (err == -ENETUNREACH) |
| dev->stats.tx_carrier_errors++; |
| dst_release(ndst); |
| dev->stats.tx_errors++; |
| kfree_skb(skb); |
| } |
| |
| static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev, |
| struct vxlan_fdb *f, __be32 vni, bool did_rsc) |
| { |
| struct vxlan_rdst nh_rdst; |
| struct nexthop *nh; |
| bool do_xmit; |
| u32 hash; |
| |
| memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); |
| hash = skb_get_hash(skb); |
| |
| rcu_read_lock(); |
| nh = rcu_dereference(f->nh); |
| if (!nh) { |
| rcu_read_unlock(); |
| goto drop; |
| } |
| do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); |
| rcu_read_unlock(); |
| |
| if (likely(do_xmit)) |
| vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc); |
| else |
| goto drop; |
| |
| return; |
| |
| drop: |
| dev->stats.tx_dropped++; |
| 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); |
| struct vxlan_rdst *rdst, *fdst = NULL; |
| const struct ip_tunnel_info *info; |
| bool did_rsc = false; |
| struct vxlan_fdb *f; |
| struct ethhdr *eth; |
| __be32 vni = 0; |
| |
| info = skb_tunnel_info(skb); |
| |
| skb_reset_mac_header(skb); |
| |
| if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { |
| if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && |
| info->mode & IP_TUNNEL_INFO_TX) { |
| vni = tunnel_id_to_key32(info->key.tun_id); |
| } else { |
| if (info && info->mode & IP_TUNNEL_INFO_TX) |
| vxlan_xmit_one(skb, dev, vni, NULL, false); |
| else |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| } |
| |
| if (vxlan->cfg.flags & VXLAN_F_PROXY) { |
| eth = eth_hdr(skb); |
| if (ntohs(eth->h_proto) == ETH_P_ARP) |
| return arp_reduce(dev, skb, vni); |
| #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 *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); |
| |
| if (m->icmph.icmp6_code == 0 && |
| m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) |
| return neigh_reduce(dev, skb, vni); |
| } |
| #endif |
| } |
| |
| eth = eth_hdr(skb); |
| f = vxlan_find_mac(vxlan, eth->h_dest, vni); |
| did_rsc = false; |
| |
| if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.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, vni); |
| } |
| |
| if (f == NULL) { |
| f = vxlan_find_mac(vxlan, all_zeros_mac, vni); |
| if (f == NULL) { |
| if ((vxlan->cfg.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; |
| } |
| } |
| |
| if (rcu_access_pointer(f->nh)) { |
| vxlan_xmit_nh(skb, dev, f, |
| (vni ? : vxlan->default_dst.remote_vni), did_rsc); |
| } else { |
| 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, vni, rdst, did_rsc); |
| } |
| if (fdst) |
| vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); |
| else |
| kfree_skb(skb); |
| } |
| |
| return NETDEV_TX_OK; |
| } |
| |
| /* Walk the forwarding table and purge stale entries */ |
| static void vxlan_cleanup(struct timer_list *t) |
| { |
| struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer); |
| 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(&vxlan->hash_lock[h]); |
| hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { |
| struct vxlan_fdb *f |
| = container_of(p, struct vxlan_fdb, hlist); |
| unsigned long timeout; |
| |