static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
{
struct net *net = dev_net(skb->dev);
struct metadata_dst *tun_dst = NULL;
struct ip_tunnel_net *itn;
const struct iphdr *iph;
struct ip_tunnel *tunnel;
if (tpi->proto == htons(ETH_P_TEB))
itn = net_generic(net, gre_tap_net_id);
else
itn = net_generic(net, ipgre_net_id);
iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
iph->saddr, iph->daddr, tpi->key);
if (tunnel) {
skb_pop_mac_header(skb);
if (tunnel->collect_md) {
__be16 flags;
__be64 tun_id;
flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY);
tun_id = key_to_tunnel_id(tpi->key);
tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0);
if (!tun_dst)
return PACKET_REJECT;
}
ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
return PACKET_RCVD;
}
return PACKET_REJECT;
}
static int parse_header(struct iphdr *iph, __be16 *flags, __be64 *tun_id,
bool *is_gre64)
{
/* IP and ICMP protocol handlers check that the IHL is valid. */
struct gre_base_hdr *greh = (struct gre_base_hdr *)((u8 *)iph + (iph->ihl << 2));
__be32 *options = (__be32 *)(greh + 1);
int hdr_len;
*flags = greh->flags;
if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
return -EINVAL;
if (unlikely(greh->protocol != htons(ETH_P_TEB)))
return -EINVAL;
hdr_len = GRE_HEADER_SECTION;
if (greh->flags & GRE_CSUM) {
hdr_len += GRE_HEADER_SECTION;
options++;
}
if (greh->flags & GRE_KEY) {
__be32 seq;
__be32 gre_key;
gre_key = *options;
hdr_len += GRE_HEADER_SECTION;
options++;
if (greh->flags & GRE_SEQ) {
seq = *options;
*is_gre64 = true;
} else {
seq = 0;
*is_gre64 = false;
}
*tun_id = key_to_tunnel_id(gre_key, seq);
} else {
*tun_id = 0;
/* Ignore GRE seq if there is no key present. */
*is_gre64 = false;
}
if (greh->flags & GRE_SEQ)
hdr_len += GRE_HEADER_SECTION;
return hdr_len;
}
static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
{
struct net *net = dev_net(skb->dev);
struct metadata_dst *tun_dst = NULL;
struct ip_tunnel_net *itn;
const struct iphdr *iph;
struct ip_tunnel *tunnel;
if (tpi->proto == htons(ETH_P_TEB))
itn = net_generic(net, gre_tap_net_id);
else
itn = net_generic(net, ipgre_net_id);
iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
iph->saddr, iph->daddr, tpi->key);
if (tunnel) {
skb_pop_mac_header(skb);
if (tunnel->collect_md) {
struct ip_tunnel_info *info;
tun_dst = metadata_dst_alloc(0, GFP_ATOMIC);
if (!tun_dst)
return PACKET_REJECT;
info = &tun_dst->u.tun_info;
info->key.ipv4_src = iph->saddr;
info->key.ipv4_dst = iph->daddr;
info->key.ipv4_tos = iph->tos;
info->key.ipv4_ttl = iph->ttl;
info->mode = IP_TUNNEL_INFO_RX;
info->key.tun_flags = tpi->flags &
(TUNNEL_CSUM | TUNNEL_KEY);
info->key.tun_id = key_to_tunnel_id(tpi->key);
info->key.tp_src = 0;
info->key.tp_dst = 0;
}
ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
return PACKET_RCVD;
}
return PACKET_REJECT;
}
/* Called with rcu_read_lock and BH disabled. */
static int gre_rcv(struct sk_buff *skb,
const struct tnl_ptk_info *tpi)
{
struct ovs_key_ipv4_tunnel tun_key;
struct ovs_net *ovs_net;
struct vport *vport;
__be64 key;
ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
vport = rcu_dereference(ovs_net->vport_net.gre_vport);
if (unlikely(!vport))
return PACKET_REJECT;
key = key_to_tunnel_id(tpi->key, tpi->seq);
ovs_flow_tun_key_init(&tun_key, ip_hdr(skb), key,
filter_tnl_flags(tpi->flags));
ovs_vport_receive(vport, skb, &tun_key);
return PACKET_RCVD;
}
static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
{
struct net *net = dev_net(skb->dev);
struct metadata_dst tun_dst;
struct ip_tunnel_net *itn;
const struct iphdr *iph;
struct ip_tunnel *tunnel;
if (tpi->proto != htons(ETH_P_TEB))
return PACKET_REJECT;
itn = net_generic(net, gre_tap_net_id);
iph = ip_hdr(skb);
tunnel = rcu_dereference(itn->collect_md_tun);
if (tunnel) {
__be16 flags;
__be64 tun_id;
int err;
skb_pop_mac_header(skb);
flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY);
tun_id = key_to_tunnel_id(tpi->key);
ovs_ip_tun_rx_dst(&tun_dst, skb, flags, tun_id, 0);
skb_reset_network_header(skb);
err = IP_ECN_decapsulate(iph, skb);
if (unlikely(err)) {
if (err > 1) {
++tunnel->dev->stats.rx_frame_errors;
++tunnel->dev->stats.rx_errors;
return PACKET_REJECT;
}
}
ovs_ip_tunnel_rcv(tunnel->dev, skb, &tun_dst);
return PACKET_RCVD;
}
return PACKET_REJECT;
}
/* Called with rcu_read_lock and BH disabled. */
static int gre_rcv(struct sk_buff *skb,
const struct tnl_ptk_info *tpi)
{
struct ovs_tunnel_info tun_info;
struct ovs_net *ovs_net;
struct vport *vport;
__be64 key;
ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
if ((tpi->flags & TUNNEL_KEY) && (tpi->flags & TUNNEL_SEQ))
vport = rcu_dereference(ovs_net->vport_net.gre64_vport);
else
vport = rcu_dereference(ovs_net->vport_net.gre_vport);
if (unlikely(!vport))
return PACKET_REJECT;
key = key_to_tunnel_id(tpi->key, tpi->seq);
ovs_flow_tun_info_init(&tun_info, ip_hdr(skb), key,
filter_tnl_flags(tpi->flags), NULL, 0);
ovs_vport_receive(vport, skb, &tun_info);
return PACKET_RCVD;
}
