// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright (c) 2014 Mahesh Bandewar <[email protected]>
*/
#include <net/inet_dscp.h>
#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);
u64_stats_inc(&pcptr->rx_pkts);
u64_stats_add(&pcptr->rx_bytes, len);
if (mcast)
u64_stats_inc(&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 = skb_ip_totlen(skb);
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);
}
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 noinline_for_stack 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 = ip4h->tos & INET_DSCP_MASK,
.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);
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
err = ip_local_out(net, NULL, skb);
if (unlikely(net_xmit_eval(err)))
DEV_STATS_INC(dev, tx_errors);
else
ret = NET_XMIT_SUCCESS;
goto out;
err:
DEV_STATS_INC(dev, tx_errors);
kfree_skb(skb);
out:
return ret;
}
#if IS_ENABLED(CONFIG_IPV6)
static noinline_for_stack int
ipvlan_route_v6_outbound(struct net_device *dev, struct sk_buff *skb)
{
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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,
};
struct dst_entry *dst;
int err;
dst = ip6_route_output(dev_net(dev), NULL, &fl6);
err = dst->error;
if (err) {
dst_release(dst);
return err;
}
skb_dst_set(skb, dst);
return 0;
}
static int ipvlan_process_v6_outbound(struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
int err, ret = NET_XMIT_DROP;
err = ipvlan_route_v6_outbound(dev, skb);
if (unlikely(err)) {
DEV_STATS_INC(dev, tx_errors);
kfree_skb(skb);
return err;
}
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
err = ip6_local_out(dev_net(dev), NULL, skb);
if (unlikely(net_xmit_eval(err)))
DEV_STATS_INC(dev, tx_errors);
else
ret = NET_XMIT_SUCCESS;
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)
{
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 */
struct ethhdr *ethh = eth_hdr(skb);
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) {
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);
dev_core_stats_rx_dropped_inc(skb->dev);
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;
}
ipvlan_rcv_frame(addr, &skb, true);
return NET_XMIT_SUCCESS;
}
}
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 = skb_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;
}
ipvlan_rcv_frame(addr, &skb, true);
return NET_XMIT_SUCCESS;
}
}
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.
*/
dev_forward_skb(ipvlan->phy_dev, skb);
return NET_XMIT_SUCCESS;
} else if (is_multicast_ether_addr(eth->h_dest)) {
skb_reset_mac_header(skb);
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, "%s called for mode = [%x]\n", __func__, 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, "%s called for mode = [%x]\n", __func__, port->mode);
kfree_skb(skb);
return RX_HANDLER_CONSUMED;
}
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