static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
if (OVTYPE_IS_GRETAP (skb)) {
gretap_gre_tap_xmit_in (skb) = rdtsc ();
}
skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM));
if (IS_ERR(skb))
goto out;
if (skb_cow_head(skb, dev->needed_headroom))
goto free_skb;
__gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));
return NETDEV_TX_OK;
free_skb:
kfree_skb(skb);
out:
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
static int rpl_gre_handle_offloads(struct sk_buff *skb, bool gre_csum)
{
if (skb_is_gso(skb) && skb_is_encapsulated(skb))
return -ENOSYS;
#undef gre_handle_offloads
return gre_handle_offloads(skb, gre_csum);
}
static struct sk_buff *__build_header(struct sk_buff *skb,
int tunnel_hlen)
{
const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->egress_tun_key;
struct tnl_ptk_info tpi;
skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM));
if (IS_ERR(skb))
return NULL;
tpi.flags = filter_tnl_flags(tun_key->tun_flags);
tpi.proto = htons(ETH_P_TEB);
tpi.key = be64_get_low32(tun_key->tun_id);
tpi.seq = 0;
gre_build_header(skb, &tpi, tunnel_hlen);
return skb;
}
static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
const struct iphdr *tnl_params;
if (OVTYPE_IS_GRE (skb)) {
gre_ipgre_xmit_in (skb) = rdtsc ();
}
if (dev->header_ops) {
/* Need space for new headers */
if (skb_cow_head(skb, dev->needed_headroom -
(tunnel->hlen + sizeof(struct iphdr))))
goto free_skb;
tnl_params = (const struct iphdr *)skb->data;
/* Pull skb since ip_tunnel_xmit() needs skb->data pointing
* to gre header.
*/
skb_pull(skb, tunnel->hlen + sizeof(struct iphdr));
skb_reset_mac_header(skb);
} else {
if (skb_cow_head(skb, dev->needed_headroom))
goto free_skb;
tnl_params = &tunnel->parms.iph;
}
skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM));
if (IS_ERR(skb))
goto out;
__gre_xmit(skb, dev, tnl_params, skb->protocol);
return NETDEV_TX_OK;
free_skb:
kfree_skb(skb);
out:
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
tunnel_hlen = ip_gre_calc_hlen(key->tun_flags);
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ tunnel_hlen + sizeof(struct iphdr);
if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
int head_delta = SKB_DATA_ALIGN(min_headroom -
skb_headroom(skb) +
16);
err = pskb_expand_head(skb, max_t(int, head_delta, 0),
0, GFP_ATOMIC);
if (unlikely(err))
goto err_free_rt;
}
/* Push Tunnel header. */
skb = gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM));
if (IS_ERR(skb)) {
skb = NULL;
goto err_free_rt;
}
flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
build_header(skb, tunnel_hlen, flags, htons(ETH_P_TEB),
tunnel_id_to_key(tun_info->key.tun_id), 0);
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
err = iptunnel_xmit(skb->sk, rt, skb, fl.saddr,
key->ipv4_dst, IPPROTO_GRE,
key->ipv4_tos, key->ipv4_ttl, df, false);
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
return;
