Added new TC module, updates to the exec hooking system and the userland module

src/ebpf/include/bpf/tc.c

@@ -0,0 +1,39 @@
+#include <linux/bpf.h>
+#include <linux/if_ether.h>
+#include <linux/pkt_cls.h>
+#include <linux/swab.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_helpers.h>
+
+
+struct pkt_ctx_t {
+    struct cursor *c;
+    struct ethhdr *eth;
+    struct iphdr *ipv4;
+    struct tcphdr *tcp;
+    struct udphdr *udp;
+    struct http_req_t *http_req;
+};
+
+SEC("classifier/egress")
+int classifier(struct __sk_buff *skb){
+	void *data_end = (void *)(unsigned long long)skb->data_end;
+	void *data = (void *)(unsigned long long)skb->data;
+	struct ethhdr *eth = data;
+    bpf_printk("Heey\n");
+	if (data + sizeof(struct ethhdr) > data_end)
+		return TC_ACT_SHOT;
+
+	if (eth->h_proto == ___constant_swab16(ETH_P_IP))
+		/*
+		 * Packet processing is not implemented in this sample. Parse
+		 * IPv4 header, possibly push/pop encapsulation headers, update
+		 * header fields, drop or transmit based on network policy,
+		 * collect statistics and store them in a eBPF map...
+		 */
+		return 0;//process_packet(skb);
+	else
+		return TC_ACT_OK;
+}
+
+char _license[4] SEC("license") = "GPL";