forked from Minki/linux
608 lines
14 KiB
C
608 lines
14 KiB
C
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/* 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;
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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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static 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 (!ipvlan)
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return;
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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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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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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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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 (is_v6 && addr->atype == IPVL_IPV6 &&
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ipv6_addr_equal(&addr->ip6addr, iaddr))
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return addr;
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else if (!is_v6 && addr->atype == IPVL_IPV4 &&
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addr->ip4addr.s_addr ==
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((struct in_addr *)iaddr)->s_addr)
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return addr;
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}
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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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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, bool sync)
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{
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hlist_del_rcu(&addr->hlnode);
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if (sync)
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synchronize_rcu();
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}
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bool ipvlan_addr_busy(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
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{
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struct ipvl_port *port = ipvlan->port;
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struct ipvl_addr *addr;
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list_for_each_entry(addr, &ipvlan->addrs, anode) {
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if ((is_v6 && addr->atype == IPVL_IPV6 &&
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ipv6_addr_equal(&addr->ip6addr, iaddr)) ||
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(!is_v6 && addr->atype == IPVL_IPV4 &&
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addr->ip4addr.s_addr == ((struct in_addr *)iaddr)->s_addr))
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return true;
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}
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if (ipvlan_ht_addr_lookup(port, iaddr, is_v6))
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return true;
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return false;
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}
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static void *ipvlan_get_L3_hdr(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, sizeof(*arph))))
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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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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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*type = IPVL_ICMPV6;
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lyr3h = ip6h + 1;
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}
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break;
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}
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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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static void ipvlan_multicast_frame(struct ipvl_port *port, struct sk_buff *skb,
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const struct ipvl_dev *in_dev, bool local)
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{
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struct ethhdr *eth = eth_hdr(skb);
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struct ipvl_dev *ipvlan;
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struct sk_buff *nskb;
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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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if (skb->protocol == htons(ETH_P_PAUSE))
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return;
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list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
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if (local && (ipvlan == in_dev))
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continue;
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mac_hash = ipvlan_mac_hash(eth->h_dest);
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if (!test_bit(mac_hash, ipvlan->mac_filters))
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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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if (!nskb)
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goto mcast_acct;
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if (ether_addr_equal(eth->h_dest, ipvlan->phy_dev->broadcast))
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nskb->pkt_type = PACKET_BROADCAST;
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else
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nskb->pkt_type = PACKET_MULTICAST;
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nskb->dev = ipvlan->dev;
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if (local)
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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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mcast_acct:
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ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
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}
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/* Locally generated? ...Forward a copy to the main-device as
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* well. On the RX side we'll ignore it (wont give it to any
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* of the virtual devices.
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*/
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if (local) {
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nskb = skb_clone(skb, GFP_ATOMIC);
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if (nskb) {
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if (ether_addr_equal(eth->h_dest, port->dev->broadcast))
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nskb->pkt_type = PACKET_BROADCAST;
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else
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nskb->pkt_type = PACKET_MULTICAST;
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dev_forward_skb(port->dev, nskb);
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}
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}
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}
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static int ipvlan_rcv_frame(struct ipvl_addr *addr, struct sk_buff *skb,
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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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len = skb->len + ETH_HLEN;
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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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skb->dev = dev;
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skb->pkt_type = PACKET_HOST;
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if (local) {
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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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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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if (addr_type == 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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} else if (addr_type == 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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*/
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ndmh = (struct nd_msg *)lyr3h;
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if (ndmh->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
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i6addr = &ndmh->target;
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addr = ipvlan_ht_addr_lookup(port, i6addr, true);
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}
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} else if (addr_type == IPVL_IPV4) {
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struct iphdr *ip4h;
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__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);
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} else if (addr_type == IPVL_ARP) {
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struct arphdr *arph;
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unsigned char *arp_ptr;
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__be32 dip;
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arph = (struct arphdr *)lyr3h;
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arp_ptr = (unsigned char *)(arph + 1);
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if (use_dest)
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arp_ptr += (2 * port->dev->addr_len) + 4;
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else
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arp_ptr += port->dev->addr_len;
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memcpy(&dip, arp_ptr, 4);
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addr = ipvlan_ht_addr_lookup(port, &dip, false);
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}
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return addr;
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}
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static int ipvlan_process_v4_outbound(struct sk_buff *skb)
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{
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const struct iphdr *ip4h = ip_hdr(skb);
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struct net_device *dev = skb->dev;
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struct rtable *rt;
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int err, ret = NET_XMIT_DROP;
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struct flowi4 fl4 = {
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.flowi4_oif = dev->iflink,
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.flowi4_tos = RT_TOS(ip4h->tos),
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.flowi4_flags = FLOWI_FLAG_ANYSRC,
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.daddr = ip4h->daddr,
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.saddr = ip4h->saddr,
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};
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rt = ip_route_output_flow(dev_net(dev), &fl4, NULL);
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if (IS_ERR(rt))
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goto err;
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if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
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ip_rt_put(rt);
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goto err;
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}
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skb_dst_drop(skb);
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skb_dst_set(skb, &rt->dst);
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err = ip_local_out(skb);
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if (unlikely(net_xmit_eval(err)))
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dev->stats.tx_errors++;
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else
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ret = NET_XMIT_SUCCESS;
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goto out;
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err:
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dev->stats.tx_errors++;
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kfree_skb(skb);
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out:
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return ret;
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}
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static int ipvlan_process_v6_outbound(struct sk_buff *skb)
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{
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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struct net_device *dev = skb->dev;
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struct dst_entry *dst;
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int err, ret = NET_XMIT_DROP;
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struct flowi6 fl6 = {
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.flowi6_iif = skb->dev->ifindex,
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.daddr = ip6h->daddr,
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.saddr = ip6h->saddr,
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.flowi6_flags = FLOWI_FLAG_ANYSRC,
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.flowlabel = ip6_flowinfo(ip6h),
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.flowi6_mark = skb->mark,
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.flowi6_proto = ip6h->nexthdr,
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};
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dst = ip6_route_output(dev_net(dev), NULL, &fl6);
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if (IS_ERR(dst))
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goto err;
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skb_dst_drop(skb);
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skb_dst_set(skb, dst);
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err = ip6_local_out(skb);
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if (unlikely(net_xmit_eval(err)))
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dev->stats.tx_errors++;
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else
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ret = NET_XMIT_SUCCESS;
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goto out;
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err:
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dev->stats.tx_errors++;
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kfree_skb(skb);
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out:
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return ret;
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}
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static int ipvlan_process_outbound(struct sk_buff *skb,
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const struct ipvl_dev *ipvlan)
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{
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struct ethhdr *ethh = eth_hdr(skb);
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int ret = NET_XMIT_DROP;
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/* In this mode we dont care about multicast and broadcast traffic */
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if (is_multicast_ether_addr(ethh->h_dest)) {
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pr_warn_ratelimited("Dropped {multi|broad}cast of type= [%x]\n",
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ntohs(skb->protocol));
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kfree_skb(skb);
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goto out;
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}
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/* The ipvlan is a pseudo-L2 device, so the packets that we receive
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* will have L2; which need to discarded and processed further
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* in the net-ns of the main-device.
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*/
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if (skb_mac_header_was_set(skb)) {
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skb_pull(skb, sizeof(*ethh));
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skb->mac_header = (typeof(skb->mac_header))~0U;
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skb_reset_network_header(skb);
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}
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if (skb->protocol == htons(ETH_P_IPV6))
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ret = ipvlan_process_v6_outbound(skb);
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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 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)) {
|
||
|
u8 ip_summed = skb->ip_summed;
|
||
|
|
||
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
||
|
ipvlan_multicast_frame(ipvlan->port, skb, ipvlan, true);
|
||
|
skb->ip_summed = ip_summed;
|
||
|
}
|
||
|
|
||
|
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(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, skb, 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))
|
||
|
ipvlan_multicast_frame(port, skb, NULL, false);
|
||
|
} 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, skb, 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 NET_RX_DROP;
|
||
|
}
|