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 ipgre_rcv(struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
struct ip_tunnel_net *itn;
const struct iphdr *iph;
struct ip_tunnel *tunnel;
struct tnl_ptk_info tpi;
int hdr_len;
bool csum_err = false;
if (parse_gre_header(skb, &tpi, &csum_err, &hdr_len) < 0)
goto drop;
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);
ip_tunnel_rcv(tunnel, skb, &tpi, hdr_len, log_ecn_error);
return 0;
}
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
drop:
kfree_skb(skb);
return 0;
}
static int ipip_rcv(struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
struct ip_tunnel *tunnel;
const struct iphdr *iph;
if (iptunnel_pull_header(skb, 0, tpi.proto))
goto drop;
iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
iph->saddr, iph->daddr, 0);
if (tunnel) {
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
goto drop;
return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
}
return -1;
drop:
kfree_skb(skb);
return 0;
}
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;
}
static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
{
struct net *net = dev_net(skb->dev);
struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
struct metadata_dst *tun_dst = NULL;
struct ip_tunnel *tunnel;
const struct iphdr *iph;
iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
iph->saddr, iph->daddr, 0);
if (tunnel) {
const struct tnl_ptk_info *tpi;
if (tunnel->parms.iph.protocol != ipproto &&
tunnel->parms.iph.protocol != 0)
goto drop;
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
goto drop;
#if IS_ENABLED(CONFIG_MPLS)
if (ipproto == IPPROTO_MPLS)
tpi = &mplsip_tpi;
else
#endif
tpi = &ipip_tpi;
if (iptunnel_pull_header(skb, 0, tpi->proto, false))
goto drop;
if (tunnel->collect_md) {
tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
if (!tun_dst)
return 0;
}
return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
}
return -1;
drop:
kfree_skb(skb);
return 0;
}
static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
struct ip_tunnel_net *itn, int hdr_len, bool raw_proto)
{
struct metadata_dst *tun_dst = NULL;
const struct iphdr *iph;
struct ip_tunnel *tunnel;
iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
iph->saddr, iph->daddr, tpi->key);
if (tunnel) {
if (__iptunnel_pull_header(skb, hdr_len, tpi->proto,
raw_proto, false) < 0)
goto drop;
if (tunnel->dev->type != ARPHRD_NONE)
skb_pop_mac_header(skb);
else
skb_reset_mac_header(skb);
if (tunnel->collect_md) {
__be16 flags;
__be64 tun_id;
flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY);
tun_id = key32_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_NEXT;
drop:
kfree_skb(skb);
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 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) {
ip_tunnel_rcv(tunnel, skb, tpi, false);
return PACKET_RCVD;
}
return PACKET_REJECT;
}