/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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*/
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#include "ipvlan.h"
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static u32 ipvlan_jhash_secret __read_mostly;
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void ipvlan_init_secret(void)
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{
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net_get_random_once(&ipvlan_jhash_secret, sizeof(ipvlan_jhash_secret));
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}
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void ipvlan_count_rx(const struct ipvl_dev *ipvlan,
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unsigned int len, bool success, bool mcast)
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{
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if (likely(success)) {
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struct ipvl_pcpu_stats *pcptr;
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pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
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u64_stats_update_begin(&pcptr->syncp);
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pcptr->rx_pkts++;
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pcptr->rx_bytes += len;
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if (mcast)
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pcptr->rx_mcast++;
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u64_stats_update_end(&pcptr->syncp);
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} else {
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this_cpu_inc(ipvlan->pcpu_stats->rx_errs);
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}
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}
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EXPORT_SYMBOL_GPL(ipvlan_count_rx);
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#if IS_ENABLED(CONFIG_IPV6)
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static u8 ipvlan_get_v6_hash(const void *iaddr)
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{
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const struct in6_addr *ip6_addr = iaddr;
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return __ipv6_addr_jhash(ip6_addr, ipvlan_jhash_secret) &
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IPVLAN_HASH_MASK;
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}
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#else
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static u8 ipvlan_get_v6_hash(const void *iaddr)
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{
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return 0;
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}
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#endif
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static u8 ipvlan_get_v4_hash(const void *iaddr)
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{
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const struct in_addr *ip4_addr = iaddr;
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return jhash_1word(ip4_addr->s_addr, ipvlan_jhash_secret) &
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IPVLAN_HASH_MASK;
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}
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static bool addr_equal(bool is_v6, struct ipvl_addr *addr, const void *iaddr)
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{
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if (!is_v6 && addr->atype == IPVL_IPV4) {
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struct in_addr *i4addr = (struct in_addr *)iaddr;
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return addr->ip4addr.s_addr == i4addr->s_addr;
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#if IS_ENABLED(CONFIG_IPV6)
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} else if (is_v6 && addr->atype == IPVL_IPV6) {
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struct in6_addr *i6addr = (struct in6_addr *)iaddr;
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return ipv6_addr_equal(&addr->ip6addr, i6addr);
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#endif
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}
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return false;
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}
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static struct ipvl_addr *ipvlan_ht_addr_lookup(const struct ipvl_port *port,
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const void *iaddr, bool is_v6)
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{
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struct ipvl_addr *addr;
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u8 hash;
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hash = is_v6 ? ipvlan_get_v6_hash(iaddr) :
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ipvlan_get_v4_hash(iaddr);
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hlist_for_each_entry_rcu(addr, &port->hlhead[hash], hlnode)
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if (addr_equal(is_v6, addr, iaddr))
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return addr;
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return NULL;
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}
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void ipvlan_ht_addr_add(struct ipvl_dev *ipvlan, struct ipvl_addr *addr)
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{
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struct ipvl_port *port = ipvlan->port;
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u8 hash;
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hash = (addr->atype == IPVL_IPV6) ?
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ipvlan_get_v6_hash(&addr->ip6addr) :
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ipvlan_get_v4_hash(&addr->ip4addr);
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if (hlist_unhashed(&addr->hlnode))
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hlist_add_head_rcu(&addr->hlnode, &port->hlhead[hash]);
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}
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void ipvlan_ht_addr_del(struct ipvl_addr *addr)
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{
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hlist_del_init_rcu(&addr->hlnode);
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}
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struct ipvl_addr *ipvlan_find_addr(const struct ipvl_dev *ipvlan,
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const void *iaddr, bool is_v6)
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{
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struct ipvl_addr *addr, *ret = NULL;
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rcu_read_lock();
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list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) {
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if (addr_equal(is_v6, addr, iaddr)) {
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ret = addr;
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break;
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}
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}
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rcu_read_unlock();
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return ret;
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}
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bool ipvlan_addr_busy(struct ipvl_port *port, void *iaddr, bool is_v6)
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{
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struct ipvl_dev *ipvlan;
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bool ret = false;
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rcu_read_lock();
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list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
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if (ipvlan_find_addr(ipvlan, iaddr, is_v6)) {
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ret = true;
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break;
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}
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}
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rcu_read_unlock();
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return ret;
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}
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static void *ipvlan_get_L3_hdr(struct ipvl_port *port, struct sk_buff *skb, int *type)
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{
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void *lyr3h = NULL;
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switch (skb->protocol) {
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case htons(ETH_P_ARP): {
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struct arphdr *arph;
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if (unlikely(!pskb_may_pull(skb, arp_hdr_len(port->dev))))
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return NULL;
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arph = arp_hdr(skb);
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*type = IPVL_ARP;
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lyr3h = arph;
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break;
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}
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case htons(ETH_P_IP): {
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u32 pktlen;
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struct iphdr *ip4h;
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if (unlikely(!pskb_may_pull(skb, sizeof(*ip4h))))
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return NULL;
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ip4h = ip_hdr(skb);
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pktlen = ntohs(ip4h->tot_len);
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if (ip4h->ihl < 5 || ip4h->version != 4)
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return NULL;
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if (skb->len < pktlen || pktlen < (ip4h->ihl * 4))
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return NULL;
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*type = IPVL_IPV4;
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lyr3h = ip4h;
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break;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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case htons(ETH_P_IPV6): {
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struct ipv6hdr *ip6h;
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if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h))))
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return NULL;
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ip6h = ipv6_hdr(skb);
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if (ip6h->version != 6)
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return NULL;
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*type = IPVL_IPV6;
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lyr3h = ip6h;
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/* Only Neighbour Solicitation pkts need different treatment */
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if (ipv6_addr_any(&ip6h->saddr) &&
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ip6h->nexthdr == NEXTHDR_ICMP) {
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struct icmp6hdr *icmph;
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if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph))))
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return NULL;
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ip6h = ipv6_hdr(skb);
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icmph = (struct icmp6hdr *)(ip6h + 1);
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if (icmph->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
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/* Need to access the ipv6 address in body */
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if (unlikely(!pskb_may_pull(skb, sizeof(*ip6h) + sizeof(*icmph)
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+ sizeof(struct in6_addr))))
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return NULL;
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ip6h = ipv6_hdr(skb);
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icmph = (struct icmp6hdr *)(ip6h + 1);
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}
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*type = IPVL_ICMPV6;
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lyr3h = icmph;
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}
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break;
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}
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#endif
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default:
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return NULL;
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}
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return lyr3h;
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}
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unsigned int ipvlan_mac_hash(const unsigned char *addr)
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{
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u32 hash = jhash_1word(__get_unaligned_cpu32(addr+2),
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ipvlan_jhash_secret);
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return hash & IPVLAN_MAC_FILTER_MASK;
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}
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void ipvlan_process_multicast(struct work_struct *work)
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{
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struct ipvl_port *port = container_of(work, struct ipvl_port, wq);
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struct ethhdr *ethh;
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struct ipvl_dev *ipvlan;
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struct sk_buff *skb, *nskb;
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struct sk_buff_head list;
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unsigned int len;
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unsigned int mac_hash;
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int ret;
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u8 pkt_type;
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bool tx_pkt;
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__skb_queue_head_init(&list);
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spin_lock_bh(&port->backlog.lock);
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skb_queue_splice_tail_init(&port->backlog, &list);
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spin_unlock_bh(&port->backlog.lock);
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while ((skb = __skb_dequeue(&list)) != NULL) {
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struct net_device *dev = skb->dev;
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bool consumed = false;
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ethh = eth_hdr(skb);
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tx_pkt = IPVL_SKB_CB(skb)->tx_pkt;
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mac_hash = ipvlan_mac_hash(ethh->h_dest);
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if (ether_addr_equal(ethh->h_dest, port->dev->broadcast))
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pkt_type = PACKET_BROADCAST;
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else
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pkt_type = PACKET_MULTICAST;
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rcu_read_lock();
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list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
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if (tx_pkt && (ipvlan->dev == skb->dev))
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continue;
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if (!test_bit(mac_hash, ipvlan->mac_filters))
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continue;
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if (!(ipvlan->dev->flags & IFF_UP))
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continue;
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ret = NET_RX_DROP;
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len = skb->len + ETH_HLEN;
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nskb = skb_clone(skb, GFP_ATOMIC);
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local_bh_disable();
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if (nskb) {
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consumed = true;
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nskb->pkt_type = pkt_type;
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nskb->dev = ipvlan->dev;
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if (tx_pkt)
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ret = dev_forward_skb(ipvlan->dev, nskb);
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else
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ret = netif_rx(nskb);
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}
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ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
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local_bh_enable();
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}
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rcu_read_unlock();
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if (tx_pkt) {
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/* If the packet originated here, send it out. */
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skb->dev = port->dev;
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skb->pkt_type = pkt_type;
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dev_queue_xmit(skb);
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} else {
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if (consumed)
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consume_skb(skb);
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else
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kfree_skb(skb);
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}
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if (dev)
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dev_put(dev);
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cond_resched();
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}
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}
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static void ipvlan_skb_crossing_ns(struct sk_buff *skb, struct net_device *dev)
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{
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bool xnet = true;
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if (dev)
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xnet = !net_eq(dev_net(skb->dev), dev_net(dev));
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skb_scrub_packet(skb, xnet);
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if (dev)
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skb->dev = dev;
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}
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static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff **pskb,
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bool local)
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{
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struct ipvl_dev *ipvlan = addr->master;
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struct net_device *dev = ipvlan->dev;
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unsigned int len;
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rx_handler_result_t ret = RX_HANDLER_CONSUMED;
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bool success = false;
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struct sk_buff *skb = *pskb;
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len = skb->len + ETH_HLEN;
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/* Only packets exchanged between two local slaves need to have
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* device-up check as well as skb-share check.
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*/
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if (local) {
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if (unlikely(!(dev->flags & IFF_UP))) {
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kfree_skb(skb);
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goto out;
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}
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skb = skb_share_check(skb, GFP_ATOMIC);
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if (!skb)
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goto out;
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*pskb = skb;
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}
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if (local) {
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skb->pkt_type = PACKET_HOST;
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if (dev_forward_skb(ipvlan->dev, skb) == NET_RX_SUCCESS)
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success = true;
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} else {
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skb->dev = dev;
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ret = RX_HANDLER_ANOTHER;
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success = true;
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}
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out:
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ipvlan_count_rx(ipvlan, len, success, false);
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return ret;
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}
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static struct ipvl_addr *ipvlan_addr_lookup(struct ipvl_port *port,
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void *lyr3h, int addr_type,
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bool use_dest)
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{
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struct ipvl_addr *addr = NULL;
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switch (addr_type) {
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#if IS_ENABLED(CONFIG_IPV6)
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case IPVL_IPV6: {
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struct ipv6hdr *ip6h;
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struct in6_addr *i6addr;
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ip6h = (struct ipv6hdr *)lyr3h;
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i6addr = use_dest ? &ip6h->daddr : &ip6h->saddr;
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addr = ipvlan_ht_addr_lookup(port, i6addr, true);
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break;
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}
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case IPVL_ICMPV6: {
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struct nd_msg *ndmh;
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struct in6_addr *i6addr;
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|
/* Make sure that the NeighborSolicitation ICMPv6 packets
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* are handled to avoid DAD issue.
|
*/
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ndmh = (struct nd_msg *)lyr3h;
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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;
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|
ip4h = (struct iphdr *)lyr3h;
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i4addr = use_dest ? &ip4h->daddr : &ip4h->saddr;
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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:
|
case IPVLAN_MODE_L3S:
|
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);
|
case IPVLAN_MODE_L3S:
|
return RX_HANDLER_PASS;
|
}
|
|
/* Should not reach here */
|
WARN_ONCE(true, "ipvlan_handle_frame() called for mode = [%hx]\n",
|
port->mode);
|
kfree_skb(skb);
|
return RX_HANDLER_CONSUMED;
|
}
|
|
static struct ipvl_addr *ipvlan_skb_to_addr(struct sk_buff *skb,
|
struct net_device *dev)
|
{
|
struct ipvl_addr *addr = NULL;
|
struct ipvl_port *port;
|
void *lyr3h;
|
int addr_type;
|
|
if (!dev || !netif_is_ipvlan_port(dev))
|
goto out;
|
|
port = ipvlan_port_get_rcu(dev);
|
if (!port || port->mode != IPVLAN_MODE_L3S)
|
goto out;
|
|
lyr3h = ipvlan_get_L3_hdr(port, skb, &addr_type);
|
if (!lyr3h)
|
goto out;
|
|
addr = ipvlan_addr_lookup(port, lyr3h, addr_type, true);
|
out:
|
return addr;
|
}
|
|
struct sk_buff *ipvlan_l3_rcv(struct net_device *dev, struct sk_buff *skb,
|
u16 proto)
|
{
|
struct ipvl_addr *addr;
|
struct net_device *sdev;
|
|
addr = ipvlan_skb_to_addr(skb, dev);
|
if (!addr)
|
goto out;
|
|
sdev = addr->master->dev;
|
switch (proto) {
|
case AF_INET:
|
{
|
int err;
|
struct iphdr *ip4h = ip_hdr(skb);
|
|
err = ip_route_input_noref(skb, ip4h->daddr, ip4h->saddr,
|
ip4h->tos, sdev);
|
if (unlikely(err))
|
goto out;
|
break;
|
}
|
#if IS_ENABLED(CONFIG_IPV6)
|
case AF_INET6:
|
{
|
struct dst_entry *dst;
|
struct ipv6hdr *ip6h = ipv6_hdr(skb);
|
int flags = RT6_LOOKUP_F_HAS_SADDR;
|
struct flowi6 fl6 = {
|
.flowi6_iif = sdev->ifindex,
|
.daddr = ip6h->daddr,
|
.saddr = ip6h->saddr,
|
.flowlabel = ip6_flowinfo(ip6h),
|
.flowi6_mark = skb->mark,
|
.flowi6_proto = ip6h->nexthdr,
|
};
|
|
skb_dst_drop(skb);
|
dst = ip6_route_input_lookup(dev_net(sdev), sdev, &fl6,
|
skb, flags);
|
skb_dst_set(skb, dst);
|
break;
|
}
|
#endif
|
default:
|
break;
|
}
|
|
out:
|
return skb;
|
}
|
|
unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
|
const struct nf_hook_state *state)
|
{
|
struct ipvl_addr *addr;
|
unsigned int len;
|
|
addr = ipvlan_skb_to_addr(skb, skb->dev);
|
if (!addr)
|
goto out;
|
|
skb->dev = addr->master->dev;
|
len = skb->len + ETH_HLEN;
|
ipvlan_count_rx(addr->master, len, true, false);
|
out:
|
return NF_ACCEPT;
|
}
|
