Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
 */
 
#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));
}
 
void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
<------><------><------>    unsigned int len, bool success, bool mcast)
{
<------>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);
<------>}
}
EXPORT_SYMBOL_GPL(ipvlan_count_rx);
 
#if IS_ENABLED(CONFIG_IPV6)
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;
}
#else
static u8 ipvlan_get_v6_hash(const void *iaddr)
{
<------>return 0;
}
#endif
 
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;
}
 
static bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr)
{
<------>if (!is_v6 && addr->atype == IPVL_IPV4) {
<------><------>struct in_addr *i4addr = (struct in_addr *)iaddr;
 
<------><------>return addr->ip4addr.s_addr == i4addr->s_addr;
#if IS_ENABLED(CONFIG_IPV6)
<------>} else if (is_v6 && addr->atype == IPVL_IPV6) {
<------><------>struct in6_addr *i6addr = (struct in6_addr *)iaddr;
 
<------><------>return ipv6_addr_equal(&addr->ip6addr, i6addr);
#endif
<------>}
 
<------>return false;
}
 
static 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 (addr_equal(is_v6, addr, iaddr))
<------><------><------>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, *ret = NULL;
 
<------>rcu_read_lock();
<------>list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) {
<------><------>if (addr_equal(is_v6, addr, iaddr)) {
<------><------><------>ret = addr;
<------><------><------>break;
<------><------>}
<------>}
<------>rcu_read_unlock();
<------>return ret;
}
 
bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
{
<------>struct ipvl_dev *ipvlan;
<------>bool ret = false;
 
<------>rcu_read_lock();
<------>list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
<------><------>if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) {
<------><------><------>ret = true;
<------><------><------>break;
<------><------>}
<------>}
<------>rcu_read_unlock();
<------>return ret;
}
 
void *ipvlan_get_L3_hdr(struct ipvl_port *port, 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, arp_hdr_len(port->dev))))
<------><------><------>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;
<------>}
#if IS_ENABLED(CONFIG_IPV6)
<------>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) {
<------><------><------>struct icmp6hdr	*icmph;
 
<------><------><------>if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
<------><------><------><------>return NULL;
 
<------><------><------>ip6h = ipv6_hdr(skb);
<------><------><------>icmph = (struct icmp6hdr *)(ip6h + 1);
 
<------><------><------>if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
<------><------><------><------>/* Need to access the ipv6 address in body */
<------><------><------><------>if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
<------><------><------><------><------><------>+ sizeof(struct in6_addr))))
<------><------><------><------><------>return NULL;
 
<------><------><------><------>ip6h = ipv6_hdr(skb);
<------><------><------><------>icmph = (struct icmp6hdr *)(ip6h + 1);
<------><------><------>}
 
<------><------><------>*type = IPVL_ICMPV6;
<------><------><------>lyr3h = icmph;
<------><------>}
<------><------>break;
<------>}
#endif
<------>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 tx_pkt;
 
<------>__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) {
<------><------>struct net_device *dev = skb->dev;
<------><------>bool consumed = false;
 
<------><------>ethh = eth_hdr(skb);
<------><------>tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
<------><------>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;
 
<------><------>rcu_read_lock();
<------><------>list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
<------><------><------>if (tx_pkt && (ipvlan->dev == skb->dev))
<------><------><------><------>continue;
<------><------><------>if (!test_bit(mac_hash, ipvlan->mac_filters))
<------><------><------><------>continue;
<------><------><------>if (!(ipvlan->dev->flags & IFF_UP))
<------><------><------><------>continue;
<------><------><------>ret = NET_RX_DROP;
<------><------><------>len = skb->len + ETH_HLEN;
<------><------><------>nskb = skb_clone(skb, GFP_ATOMIC);
<------><------><------>local_bh_disable();
<------><------><------>if (nskb) {
<------><------><------><------>consumed = true;
<------><------><------><------>nskb->pkt_type = pkt_type;
<------><------><------><------>nskb->dev = ipvlan->dev;
<------><------><------><------>if (tx_pkt)
<------><------><------><------><------>ret = dev_forward_skb(ipvlan->dev, nskb);
<------><------><------><------>else
<------><------><------><------><------>ret = netif_rx(nskb);
<------><------><------>}
<------><------><------>ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
<------><------><------>local_bh_enable();
<------><------>}
<------><------>rcu_read_unlock();
 
<------><------>if (tx_pkt) {
<------><------><------>/* If the packet originated here, send it out. */
<------><------><------>skb->dev = port->dev;
<------><------><------>skb->pkt_type = pkt_type;
<------><------><------>dev_queue_xmit(skb);
<------><------>} else {
<------><------><------>if (consumed)
<------><------><------><------>consume_skb(skb);
<------><------><------>else
<------><------><------><------>kfree_skb(skb);
<------><------>}
<------><------>if (dev)
<------><------><------>dev_put(dev);
<------><------>cond_resched();
<------>}
}
 
static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
{
<------>bool xnet = true;
 
<------>if (dev)
<------><------>xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
 
<------>skb_scrub_packet(skb, xnet);
<------>if (dev)
<------><------>skb->dev = dev;
}
 
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;
<------>/* Only packets exchanged between two local slaves need to have
<------> * device-up check as well as skb-share check.
<------> */
<------>if (local) {
<------><------>if (unlikely(!(dev->flags & IFF_UP))) {
<------><------><------>kfree_skb(skb);
<------><------><------>goto out;
<------><------>}
 
<------><------>skb = skb_share_check(skb, GFP_ATOMIC);
<------><------>if (!skb)
<------><------><------>goto out;
 
<------><------>*pskb = skb;
<------>}
 
<------>if (local) {
<------><------>skb->pkt_type = PACKET_HOST;
<------><------>if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
<------><------><------>success = true;
<------>} else {
<------><------>skb->dev = dev;
<------><------>ret = RX_HANDLER_ANOTHER;
<------><------>success = true;
<------>}
 
out:
<------>ipvlan_count_rx(ipvlan, len, success, false);
<------>return ret;
}
 
struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port, void *lyr3h,
<------><------><------><------>     int addr_type, bool use_dest)
{
<------>struct ipvl_addr *addr = NULL;
 
<------>switch (addr_type) {
#if IS_ENABLED(CONFIG_IPV6)
<------>case 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);
<------><------>break;
<------>}
<------>case 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);
<------><------>}
<------><------>break;
<------>}
#endif
<------>case 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);
<------><------>break;
<------>}
<------>case 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);
<------><------>break;
<------>}
<------>}
 
<------>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,
<------><------>.flowi4_mark = skb->mark,
<------><------>.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_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;
}
 
#if IS_ENABLED(CONFIG_IPV6)
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_oif = 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_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;
}
#else
static int ipvlan_process_v6_outbound(struct sk_buff *skb)
{
<------>return NET_XMIT_DROP;
}
#endif
 
static int ipvlan_process_outbound(struct sk_buff *skb)
{
<------>struct ethhdr *ethh = eth_hdr(skb);
<------>int ret = NET_XMIT_DROP;
 
<------>/* 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)) {
<------><------>/* In this mode we dont care about
<------><------> * multicast and broadcast traffic */
<------><------>if (is_multicast_ether_addr(ethh->h_dest)) {
<------><------><------>pr_debug_ratelimited(
<------><------><------><------>"Dropped {multi|broad}cast of type=[%x]\n",
<------><------><------><------>ntohs(skb->protocol));
<------><------><------>kfree_skb(skb);
<------><------><------>goto out;
<------><------>}
 
<------><------>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, bool tx_pkt)
{
<------>if (skb->protocol == htons(ETH_P_PAUSE)) {
<------><------>kfree_skb(skb);
<------><------>return;
<------>}
 
<------>/* Record that the deferred packet is from TX or RX path. By
<------> * looking at mac-addresses on packet will lead to erronus decisions.
<------> * (This would be true for a loopback-mode on master device or a
<------> * hair-pin mode of the switch.)
<------> */
<------>IPVL_SKB_CB(skb)->tx_pkt = tx_pkt;
 
<------>spin_lock(&port->backlog.lock);
<------>if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
<------><------>if (skb->dev)
<------><------><------>dev_hold(skb->dev);
<------><------>__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(ipvlan->port, skb, &addr_type);
<------>if (!lyr3h)
<------><------>goto out;
 
<------>if (!ipvlan_is_vepa(ipvlan->port)) {
<------><------>addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
<------><------>if (addr) {
<------><------><------>if (ipvlan_is_private(ipvlan->port)) {
<------><------><------><------>consume_skb(skb);
<------><------><------><------>return NET_XMIT_DROP;
<------><------><------>}
<------><------><------>return ipvlan_rcv_frame(addr, &skb, true);
<------><------>}
<------>}
out:
<------>ipvlan_skb_crossing_ns(skb, ipvlan->phy_dev);
<------>return ipvlan_process_outbound(skb);
}
 
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 (!ipvlan_is_vepa(ipvlan->port) &&
<------>    ether_addr_equal(eth->h_dest, eth->h_source)) {
<------><------>lyr3h = ipvlan_get_L3_hdr(ipvlan->port, skb, &addr_type);
<------><------>if (lyr3h) {
<------><------><------>addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
<------><------><------>if (addr) {
<------><------><------><------>if (ipvlan_is_private(ipvlan->port)) {
<------><------><------><------><------>consume_skb(skb);
<------><------><------><------><------>return NET_XMIT_DROP;
<------><------><------><------>}
<------><------><------><------>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_skb_crossing_ns(skb, NULL);
<------><------>ipvlan_multicast_enqueue(ipvlan->port, skb, true);
<------><------>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:
#ifdef CONFIG_IPVLAN_L3S
<------>case IPVLAN_MODE_L3S:
#endif
<------><------>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(port, 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(port, 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;
 
<------>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_skb_crossing_ns(nskb, NULL);
<------><------><------><------>ipvlan_multicast_enqueue(port, nskb, false);
<------><------><------>}
<------><------>}
<------>} else {
<------><------>/* Perform like l3 mode for non-multicast packet */
<------><------>ret = ipvlan_handle_mode_l3(pskb, port);
<------>}
 
<------>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);
#ifdef CONFIG_IPVLAN_L3S
<------>case IPVLAN_MODE_L3S:
<------><------>return RX_HANDLER_PASS;
#endif
<------>}
 
<------>/* Should not reach here */
<------>WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
<------><------><------>  port->mode);
<------>kfree_skb(skb);
<------>return RX_HANDLER_CONSUMED;
}