| /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| */ |
| |
| #include "ipvlan.h" |
| |
| static u32 ipvlan_jhash_secret __read_mostly; |
| |
| void ipvlan_init_secret(void) |
| { |
| net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret)); |
| } |
| |
| static void ipvlan_count_rx(const struct ipvl_dev *ipvlan, |
| unsigned int len, bool success, bool mcast) |
| { |
| if (!ipvlan) |
| return; |
| |
| if (likely(success)) { |
| struct ipvl_pcpu_stats *pcptr; |
| |
| pcptr = this_cpu_ptr(ipvlan->pcpu_stats); |
| u64_stats_update_begin(&pcptr->syncp); |
| pcptr->rx_pkts++; |
| pcptr->rx_bytes += len; |
| if (mcast) |
| pcptr->rx_mcast++; |
| u64_stats_update_end(&pcptr->syncp); |
| } else { |
| this_cpu_inc(ipvlan->pcpu_stats->rx_errs); |
| } |
| } |
| |
| static u8 ipvlan_get_v6_hash(const void *iaddr) |
| { |
| const struct in6_addr *ip6_addr = iaddr; |
| |
| return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) & |
| IPVLAN_HASH_MASK; |
| } |
| |
| static u8 ipvlan_get_v4_hash(const void *iaddr) |
| { |
| const struct in_addr *ip4_addr = iaddr; |
| |
| return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) & |
| IPVLAN_HASH_MASK; |
| } |
| |
| struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port, |
| const void *iaddr, bool is_v6) |
| { |
| struct ipvl_addr *addr; |
| u8 hash; |
| |
| hash = is_v6 ? ipvlan_get_v6_hash(iaddr) : |
| ipvlan_get_v4_hash(iaddr); |
| hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode) { |
| if (is_v6 && addr->atype == IPVL_IPV6 && |
| ipv6_addr_equal(&addr->ip6addr, iaddr)) |
| return addr; |
| else if (!is_v6 && addr->atype == IPVL_IPV4 && |
| addr->ip4addr.s_addr == |
| ((struct in_addr *)iaddr)->s_addr) |
| return addr; |
| } |
| return NULL; |
| } |
| |
| void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr) |
| { |
| struct ipvl_port *port = ipvlan->port; |
| u8 hash; |
| |
| hash = (addr->atype == IPVL_IPV6) ? |
| ipvlan_get_v6_hash(&addr->ip6addr) : |
| ipvlan_get_v4_hash(&addr->ip4addr); |
| if (hlist_unhashed(&addr->hlnode)) |
| hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]); |
| } |
| |
| void ipvlan_ht_addr_del(struct ipvl_addr *addr) |
| { |
| hlist_del_init_rcu(&addr->hlnode); |
| } |
| |
| struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan, |
| const void *iaddr, bool is_v6) |
| { |
| struct ipvl_addr *addr; |
| |
| list_for_each_entry(addr, &ipvlan->addrs, anode) { |
| if ((is_v6 && addr->atype == IPVL_IPV6 && |
| ipv6_addr_equal(&addr->ip6addr, iaddr)) || |
| (!is_v6 && addr->atype == IPVL_IPV4 && |
| addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr)) |
| return addr; |
| } |
| return NULL; |
| } |
| |
| bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6) |
| { |
| struct ipvl_dev *ipvlan; |
| |
| ASSERT_RTNL(); |
| |
| list_for_each_entry(ipvlan, &port->ipvlans, pnode) { |
| if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) |
| return true; |
| } |
| return false; |
| } |
| |
| static void *ipvlan_get_L3_hdr(struct sk_buff *skb, int *type) |
| { |
| void *lyr3h = NULL; |
| |
| switch (skb->protocol) { |
| case htons(ETH_P_ARP): { |
| struct arphdr *arph; |
| |
| if (unlikely(!pskb_may_pull(skb, sizeof(*arph)))) |
| return NULL; |
| |
| arph = arp_hdr(skb); |
| *type = IPVL_ARP; |
| lyr3h = arph; |
| break; |
| } |
| case htons(ETH_P_IP): { |
| u32 pktlen; |
| struct iphdr *ip4h; |
| |
| if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h)))) |
| return NULL; |
| |
| ip4h = ip_hdr(skb); |
| pktlen = ntohs(ip4h->tot_len); |
| if (ip4h->ihl < 5 || ip4h->version != 4) |
| return NULL; |
| if (skb->len < pktlen || pktlen < (ip4h->ihl * 4)) |
| return NULL; |
| |
| *type = IPVL_IPV4; |
| lyr3h = ip4h; |
| break; |
| } |
| case htons(ETH_P_IPV6): { |
| struct ipv6hdr *ip6h; |
| |
| if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h)))) |
| return NULL; |
| |
| ip6h = ipv6_hdr(skb); |
| if (ip6h->version != 6) |
| return NULL; |
| |
| *type = IPVL_IPV6; |
| lyr3h = ip6h; |
| /* Only Neighbour Solicitation pkts need different treatment */ |
| if (ipv6_addr_any(&ip6h->saddr) && |
| ip6h->nexthdr == NEXTHDR_ICMP) { |
| *type = IPVL_ICMPV6; |
| lyr3h = ip6h + 1; |
| } |
| break; |
| } |
| default: |
| return NULL; |
| } |
| |
| return lyr3h; |
| } |
| |
| unsigned int ipvlan_mac_hash(const unsigned char *addr) |
| { |
| u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2), |
| ipvlan_jhash_secret); |
| |
| return hash & IPVLAN_MAC_FILTER_MASK; |
| } |
| |
| void ipvlan_process_multicast(struct work_struct *work) |
| { |
| struct ipvl_port *port = container_of(work, struct ipvl_port, wq); |
| struct ethhdr *ethh; |
| struct ipvl_dev *ipvlan; |
| struct sk_buff *skb, *nskb; |
| struct sk_buff_head list; |
| unsigned int len; |
| unsigned int mac_hash; |
| int ret; |
| u8 pkt_type; |
| bool hlocal, dlocal; |
| |
| __skb_queue_head_init(&list); |
| |
| spin_lock_bh(&port->backlog.lock); |
| skb_queue_splice_tail_init(&port->backlog, &list); |
| spin_unlock_bh(&port->backlog.lock); |
| |
| while ((skb = __skb_dequeue(&list)) != NULL) { |
| ethh = eth_hdr(skb); |
| hlocal = ether_addr_equal(ethh->h_source, port->dev->dev_addr); |
| mac_hash = ipvlan_mac_hash(ethh->h_dest); |
| |
| if (ether_addr_equal(ethh->h_dest, port->dev->broadcast)) |
| pkt_type = PACKET_BROADCAST; |
| else |
| pkt_type = PACKET_MULTICAST; |
| |
| dlocal = false; |
| rcu_read_lock(); |
| list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) { |
| if (hlocal && (ipvlan->dev == skb->dev)) { |
| dlocal = true; |
| continue; |
| } |
| if (!test_bit(mac_hash, ipvlan->mac_filters)) |
| continue; |
| |
| ret = NET_RX_DROP; |
| len = skb->len + ETH_HLEN; |
| nskb = skb_clone(skb, GFP_ATOMIC); |
| if (!nskb) |
| goto acct; |
| |
| nskb->pkt_type = pkt_type; |
| nskb->dev = ipvlan->dev; |
| if (hlocal) |
| ret = dev_forward_skb(ipvlan->dev, nskb); |
| else |
| ret = netif_rx(nskb); |
| acct: |
| ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true); |
| } |
| rcu_read_unlock(); |
| |
| if (dlocal) { |
| /* If the packet originated here, send it out. */ |
| skb->dev = port->dev; |
| skb->pkt_type = pkt_type; |
| dev_queue_xmit(skb); |
| } else { |
| kfree_skb(skb); |
| } |
| } |
| } |
| |
| static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb, |
| bool local) |
| { |
| struct ipvl_dev *ipvlan = addr->master; |
| struct net_device *dev = ipvlan->dev; |
| unsigned int len; |
| rx_handler_result_t ret = RX_HANDLER_CONSUMED; |
| bool success = false; |
| struct sk_buff *skb = *pskb; |
| |
| len = skb->len + ETH_HLEN; |
| if (unlikely(!(dev->flags & IFF_UP))) { |
| kfree_skb(skb); |
| goto out; |
| } |
| |
| skb = skb_share_check(skb, GFP_ATOMIC); |
| if (!skb) |
| goto out; |
| |
| *pskb = skb; |
| skb->dev = dev; |
| skb->pkt_type = PACKET_HOST; |
| |
| if (local) { |
| if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS) |
| success = true; |
| } else { |
| ret = RX_HANDLER_ANOTHER; |
| success = true; |
| } |
| |
| out: |
| ipvlan_count_rx(ipvlan, len, success, false); |
| return ret; |
| } |
| |
| static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, |
| void *lyr3h, int addr_type, |
| bool use_dest) |
| { |
| struct ipvl_addr *addr = NULL; |
| |
| if (addr_type == IPVL_IPV6) { |
| struct ipv6hdr *ip6h; |
| struct in6_addr *i6addr; |
| |
| ip6h = (struct ipv6hdr *)lyr3h; |
| i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr; |
| addr = ipvlan_ht_addr_lookup(port, i6addr, true); |
| } else if (addr_type == IPVL_ICMPV6) { |
| struct nd_msg *ndmh; |
| struct in6_addr *i6addr; |
| |
| /* Make sure that the NeighborSolicitation ICMPv6 packets |
| * are handled to avoid DAD issue. |
| */ |
| ndmh = (struct nd_msg *)lyr3h; |
| if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) { |
| i6addr = &ndmh->target; |
| addr = ipvlan_ht_addr_lookup(port, i6addr, true); |
| } |
| } else if (addr_type == IPVL_IPV4) { |
| struct iphdr *ip4h; |
| __be32 *i4addr; |
| |
| ip4h = (struct iphdr *)lyr3h; |
| i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr; |
| addr = ipvlan_ht_addr_lookup(port, i4addr, false); |
| } else if (addr_type == IPVL_ARP) { |
| struct arphdr *arph; |
| unsigned char *arp_ptr; |
| __be32 dip; |
| |
| arph = (struct arphdr *)lyr3h; |
| arp_ptr = (unsigned char *)(arph + 1); |
| if (use_dest) |
| arp_ptr += (2 * port->dev->addr_len) + 4; |
| else |
| arp_ptr += port->dev->addr_len; |
| |
| memcpy(&dip, arp_ptr, 4); |
| addr = ipvlan_ht_addr_lookup(port, &dip, false); |
| } |
| |
| return addr; |
| } |
| |
| static int ipvlan_process_v4_outbound(struct sk_buff *skb) |
| { |
| const struct iphdr *ip4h = ip_hdr(skb); |
| struct net_device *dev = skb->dev; |
| struct net *net = dev_net(dev); |
| struct rtable *rt; |
| int err, ret = NET_XMIT_DROP; |
| struct flowi4 fl4 = { |
| .flowi4_oif = dev->ifindex, |
| .flowi4_tos = RT_TOS(ip4h->tos), |
| .flowi4_flags = FLOWI_FLAG_ANYSRC, |
| .daddr = ip4h->daddr, |
| .saddr = ip4h->saddr, |
| }; |
| |
| rt = ip_route_output_flow(net, &fl4, NULL); |
| if (IS_ERR(rt)) |
| goto err; |
| |
| if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { |
| ip_rt_put(rt); |
| goto err; |
| } |
| skb_dst_drop(skb); |
| skb_dst_set(skb, &rt->dst); |
| err = ip_local_out(net, skb->sk, skb); |
| if (unlikely(net_xmit_eval(err))) |
| dev->stats.tx_errors++; |
| else |
| ret = NET_XMIT_SUCCESS; |
| goto out; |
| err: |
| dev->stats.tx_errors++; |
| kfree_skb(skb); |
| out: |
| return ret; |
| } |
| |
| static int ipvlan_process_v6_outbound(struct sk_buff *skb) |
| { |
| const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
| struct net_device *dev = skb->dev; |
| struct net *net = dev_net(dev); |
| struct dst_entry *dst; |
| int err, ret = NET_XMIT_DROP; |
| struct flowi6 fl6 = { |
| .flowi6_iif = dev->ifindex, |
| .daddr = ip6h->daddr, |
| .saddr = ip6h->saddr, |
| .flowi6_flags = FLOWI_FLAG_ANYSRC, |
| .flowlabel = ip6_flowinfo(ip6h), |
| .flowi6_mark = skb->mark, |
| .flowi6_proto = ip6h->nexthdr, |
| }; |
| |
| dst = ip6_route_output(net, NULL, &fl6); |
| if (dst->error) { |
| ret = dst->error; |
| dst_release(dst); |
| goto err; |
| } |
| skb_dst_drop(skb); |
| skb_dst_set(skb, dst); |
| err = ip6_local_out(net, skb->sk, skb); |
| if (unlikely(net_xmit_eval(err))) |
| dev->stats.tx_errors++; |
| else |
| ret = NET_XMIT_SUCCESS; |
| goto out; |
| err: |
| dev->stats.tx_errors++; |
| kfree_skb(skb); |
| out: |
| return ret; |
| } |
| |
| static int ipvlan_process_outbound(struct sk_buff *skb, |
| const struct ipvl_dev *ipvlan) |
| { |
| struct ethhdr *ethh = eth_hdr(skb); |
| int ret = NET_XMIT_DROP; |
| |
| /* In this mode we dont care about multicast and broadcast traffic */ |
| if (is_multicast_ether_addr(ethh->h_dest)) { |
| pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n", |
| ntohs(skb->protocol)); |
| kfree_skb(skb); |
| goto out; |
| } |
| |
| /* The ipvlan is a pseudo-L2 device, so the packets that we receive |
| * will have L2; which need to discarded and processed further |
| * in the net-ns of the main-device. |
| */ |
| if (skb_mac_header_was_set(skb)) { |
| skb_pull(skb, sizeof(*ethh)); |
| skb->mac_header = (typeof(skb->mac_header))~0U; |
| skb_reset_network_header(skb); |
| } |
| |
| if (skb->protocol == htons(ETH_P_IPV6)) |
| ret = ipvlan_process_v6_outbound(skb); |
| else if (skb->protocol == htons(ETH_P_IP)) |
| ret = ipvlan_process_v4_outbound(skb); |
| else { |
| pr_warn_ratelimited("Dropped outbound packet type=%x\n", |
| ntohs(skb->protocol)); |
| kfree_skb(skb); |
| } |
| out: |
| return ret; |
| } |
| |
| static void ipvlan_multicast_enqueue(struct ipvl_port *port, |
| struct sk_buff *skb) |
| { |
| if (skb->protocol == htons(ETH_P_PAUSE)) { |
| kfree_skb(skb); |
| return; |
| } |
| |
| spin_lock(&port->backlog.lock); |
| if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) { |
| __skb_queue_tail(&port->backlog, skb); |
| spin_unlock(&port->backlog.lock); |
| schedule_work(&port->wq); |
| } else { |
| spin_unlock(&port->backlog.lock); |
| atomic_long_inc(&skb->dev->rx_dropped); |
| kfree_skb(skb); |
| } |
| } |
| |
| static int ipvlan_xmit_mode_l3(struct sk_buff *skb, struct net_device *dev) |
| { |
| const struct ipvl_dev *ipvlan = netdev_priv(dev); |
| void *lyr3h; |
| struct ipvl_addr *addr; |
| int addr_type; |
| |
| lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| if (!lyr3h) |
| goto out; |
| |
| addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); |
| if (addr) |
| return ipvlan_rcv_frame(addr, &skb, true); |
| |
| out: |
| skb->dev = ipvlan->phy_dev; |
| return ipvlan_process_outbound(skb, ipvlan); |
| } |
| |
| static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev) |
| { |
| const struct ipvl_dev *ipvlan = netdev_priv(dev); |
| struct ethhdr *eth = eth_hdr(skb); |
| struct ipvl_addr *addr; |
| void *lyr3h; |
| int addr_type; |
| |
| if (ether_addr_equal(eth->h_dest, eth->h_source)) { |
| lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| if (lyr3h) { |
| addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true); |
| if (addr) |
| return ipvlan_rcv_frame(addr, &skb, true); |
| } |
| skb = skb_share_check(skb, GFP_ATOMIC); |
| if (!skb) |
| return NET_XMIT_DROP; |
| |
| /* Packet definitely does not belong to any of the |
| * virtual devices, but the dest is local. So forward |
| * the skb for the main-dev. At the RX side we just return |
| * RX_PASS for it to be processed further on the stack. |
| */ |
| return dev_forward_skb(ipvlan->phy_dev, skb); |
| |
| } else if (is_multicast_ether_addr(eth->h_dest)) { |
| ipvlan_multicast_enqueue(ipvlan->port, skb); |
| return NET_XMIT_SUCCESS; |
| } |
| |
| skb->dev = ipvlan->phy_dev; |
| return dev_queue_xmit(skb); |
| } |
| |
| int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct ipvl_dev *ipvlan = netdev_priv(dev); |
| struct ipvl_port *port = ipvlan_port_get_rcu_bh(ipvlan->phy_dev); |
| |
| if (!port) |
| goto out; |
| |
| if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) |
| goto out; |
| |
| switch(port->mode) { |
| case IPVLAN_MODE_L2: |
| return ipvlan_xmit_mode_l2(skb, dev); |
| case IPVLAN_MODE_L3: |
| return ipvlan_xmit_mode_l3(skb, dev); |
| } |
| |
| /* Should not reach here */ |
| WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n", |
| port->mode); |
| out: |
| kfree_skb(skb); |
| return NET_XMIT_DROP; |
| } |
| |
| static bool ipvlan_external_frame(struct sk_buff *skb, struct ipvl_port *port) |
| { |
| struct ethhdr *eth = eth_hdr(skb); |
| struct ipvl_addr *addr; |
| void *lyr3h; |
| int addr_type; |
| |
| if (ether_addr_equal(eth->h_source, skb->dev->dev_addr)) { |
| lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| if (!lyr3h) |
| return true; |
| |
| addr = ipvlan_addr_lookup(port, lyr3h, addr_type, false); |
| if (addr) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static rx_handler_result_t ipvlan_handle_mode_l3(struct sk_buff **pskb, |
| struct ipvl_port *port) |
| { |
| void *lyr3h; |
| int addr_type; |
| struct ipvl_addr *addr; |
| struct sk_buff *skb = *pskb; |
| rx_handler_result_t ret = RX_HANDLER_PASS; |
| |
| lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| if (!lyr3h) |
| goto out; |
| |
| addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); |
| if (addr) |
| ret = ipvlan_rcv_frame(addr, pskb, false); |
| |
| out: |
| return ret; |
| } |
| |
| static rx_handler_result_t ipvlan_handle_mode_l2(struct sk_buff **pskb, |
| struct ipvl_port *port) |
| { |
| struct sk_buff *skb = *pskb; |
| struct ethhdr *eth = eth_hdr(skb); |
| rx_handler_result_t ret = RX_HANDLER_PASS; |
| void *lyr3h; |
| int addr_type; |
| |
| if (is_multicast_ether_addr(eth->h_dest)) { |
| if (ipvlan_external_frame(skb, port)) { |
| struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
| |
| /* External frames are queued for device local |
| * distribution, but a copy is given to master |
| * straight away to avoid sending duplicates later |
| * when work-queue processes this frame. This is |
| * achieved by returning RX_HANDLER_PASS. |
| */ |
| if (nskb) |
| ipvlan_multicast_enqueue(port, nskb); |
| } |
| } else { |
| struct ipvl_addr *addr; |
| |
| lyr3h = ipvlan_get_L3_hdr(skb, &addr_type); |
| if (!lyr3h) |
| return ret; |
| |
| addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true); |
| if (addr) |
| ret = ipvlan_rcv_frame(addr, pskb, false); |
| } |
| |
| return ret; |
| } |
| |
| rx_handler_result_t ipvlan_handle_frame(struct sk_buff **pskb) |
| { |
| struct sk_buff *skb = *pskb; |
| struct ipvl_port *port = ipvlan_port_get_rcu(skb->dev); |
| |
| if (!port) |
| return RX_HANDLER_PASS; |
| |
| switch (port->mode) { |
| case IPVLAN_MODE_L2: |
| return ipvlan_handle_mode_l2(pskb, port); |
| case IPVLAN_MODE_L3: |
| return ipvlan_handle_mode_l3(pskb, port); |
| } |
| |
| /* Should not reach here */ |
| WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n", |
| port->mode); |
| kfree_skb(skb); |
| return RX_HANDLER_CONSUMED; |
| } |