xdp: T2666: switch to example code provided by xdp-tutorial

1 files changed, 0 insertions, 97 deletions

diff --git a/src/ebpf/xdp_drop_ebpf.c b/src/ebpf/xdp_drop_ebpf.c
deleted file mode 100644
index a08edf58d..000000000
--- a/src/ebpf/xdp_drop_ebpf.c
+++ /dev/null
@@ -1,97 +0,0 @@
-#include <linux/bpf.h>
-#include <linux/if_ether.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <linux/udp.h>
-
-#include <stdint.h>
-
-/* IP flags. */
-#define IP_CE     0x8000    /* Flag: "Congestion"     */
-#define IP_DF     0x4000    /* Flag: "Don't Fragment" */
-#define IP_MF     0x2000    /* Flag: "More Fragments" */
-#define IP_OFFSET 0x1FFF    /* "Fragment Offset" part */
-
-#define SEC(NAME) __attribute__((section(NAME), used))
-
-#define htons(x) ((__be16)___constant_swab16((x)))
-#define htonl(x) ((__be32)___constant_swab32((x)))
-
-struct vlan_hdr {
-  __be16 h_vlan_TCI;
-  __be16 h_vlan_encapsulated_proto;
-};
-
-SEC("prog")
-int xdp_drop(struct xdp_md *ctx) {
-  void *data_end = (void *)(long)ctx->data_end;
-  void *data = (void *)(long)ctx->data;
-  struct ethhdr *eth = data;
-
-  uint64_t nh_off = sizeof(*eth);
-  if (data + nh_off > data_end) {
-    return XDP_PASS;
-  }
-
-  uint16_t h_proto = eth->h_proto;
-  int i;
-
-  /* Handle double VLAN tagged packet. See https://en.wikipedia.org/wiki/IEEE_802.1ad */
-  for (i = 0; i < 2; i++) {
-    if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
-      struct vlan_hdr *vhdr;
-
-      vhdr = data + nh_off;
-      nh_off += sizeof(struct vlan_hdr);
-      if (data + nh_off > data_end) {
-        return XDP_PASS;
-      }
-      h_proto = vhdr->h_vlan_encapsulated_proto;
-    }
-  }
-
-  if (h_proto == htons(ETH_P_IP)) {
-    struct iphdr *iph = data + nh_off;
-    struct udphdr *udph = data + nh_off + sizeof(struct iphdr);
-
-    uint32_t hostid = iph->daddr >> 24;
-
-    if (udph + 1 > (struct udphdr *)data_end) {
-      return XDP_PASS;
-    }
-    if (hostid == 0 || hostid == 255) {
-      return XDP_DROP;
-    }
-    if (iph->frag_off & htons(IP_MF | IP_OFFSET)) {
-      return XDP_DROP;
-    }
-    if (iph->protocol == IPPROTO_UDP) {
-      __be16 dport = htons(udph->dest);
-      __be16 sport = htons(udph->source);
-
-      if (dport == 53 || sport == 53) {
-        return XDP_DROP;
-      }
-    }
-  } else if (h_proto == htons(ETH_P_IPV6)) {
-    struct ipv6hdr *ip6h = data + nh_off;
-    struct udphdr *udph = data + nh_off + sizeof(struct ipv6hdr);
-
-    if (udph + 1 > (struct udphdr *)data_end) {
-      return XDP_PASS;
-    }
-    if (ip6h->nexthdr == IPPROTO_UDP) {
-      __be16 dport = htons(udph->dest);
-      __be16 sport = htons(udph->source);
-
-      if (dport == 53 || sport == 53) {
-        return XDP_DROP;
-      }
-    }
-  }
-
-  return XDP_PASS;
-}
-
-char _license[] SEC("license") = "GPL";