/* called by execute_plums() to execute BPF program
* or send it out of vport if destination plum_id is zero
* It's called with rcu_read_lock.
*/
static void __bpf_forward(struct bpf_dp_context *ctx, u32 dest)
{
struct datapath *dp = ctx->dp;
u32 plum_id = dest >> 16;
u32 port_id = dest & 0xffff;
struct plum *plum;
struct vport *vport;
struct ovs_key_ipv4_tunnel tun_key;
plum = rcu_dereference(dp->plums[plum_id]);
if (unlikely(!plum)) {
kfree_skb(ctx->skb);
return;
}
if (plum_id == 0) {
if (ctx->context.tun_key.dst_ip) {
tun_key.tun_id =
cpu_to_be64(ctx->context.tun_key.tun_id);
tun_key.ipv4_src =
cpu_to_be32(ctx->context.tun_key.src_ip);
tun_key.ipv4_dst =
cpu_to_be32(ctx->context.tun_key.dst_ip);
tun_key.ipv4_tos = ctx->context.tun_key.tos;
tun_key.ipv4_ttl = ctx->context.tun_key.ttl;
tun_key.tun_flags = TUNNEL_KEY;
OVS_CB(ctx->skb)->tun_key = &tun_key;
} else {
OVS_CB(ctx->skb)->tun_key = NULL;
}
plum_update_stats(plum, port_id, ctx->skb, false);
vport = ovs_vport_rcu(dp, port_id);
if (unlikely(!vport)) {
kfree_skb(ctx->skb);
return;
}
/** begin_fixme **/
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)
offload_send(vport, ctx->skb);
#else
ovs_vport_send(vport, ctx->skb);
#endif
/** end_fixme **/
} else {
ctx->context.port_id = port_id;
ctx->context.plum_id = plum_id;
BUG_ON(plum->run == NULL);
plum_update_stats(plum, port_id, ctx->skb, true);
/* execute BPF program */
plum->run(ctx);
consume_skb(ctx->skb);
}
}
static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
{
struct vport *vport;
if (unlikely(!skb))
return -ENOMEM;
vport = rcu_dereference(dp->ports[out_port]);
if (unlikely(!vport)) {
kfree_skb(skb);
return -ENODEV;
}
ovs_vport_send(vport, skb);
return 0;
}
