struct grev4hdr h_outer;
struct iphdr iph_inner;
struct tcphdr tcph;
+ __u64 flags;
int olen;
if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_inner,
if (tcph.dest != __bpf_constant_htons(cfg_port))
return TC_ACT_OK;
+ flags = BPF_F_ADJ_ROOM_FIXED_GSO;
olen = with_gre ? sizeof(h_outer) : sizeof(h_outer.ip);
/* add room between mac and network header */
- if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, 0))
+ if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
return TC_ACT_SHOT;
/* prepare new outer network header */
struct ipv6hdr iph_inner;
struct grev6hdr h_outer;
struct tcphdr tcph;
+ __u64 flags;
int olen;
if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_inner,
if (tcph.dest != __bpf_constant_htons(cfg_port))
return TC_ACT_OK;
+ flags = BPF_F_ADJ_ROOM_FIXED_GSO;
olen = with_gre ? sizeof(h_outer) : sizeof(h_outer.ip);
/* add room between mac and network header */
- if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, 0))
+ if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
return TC_ACT_SHOT;
/* prepare new outer network header */
return TC_ACT_OK;
}
- if (bpf_skb_adjust_room(skb, -olen, BPF_ADJ_ROOM_MAC, 0))
+ if (bpf_skb_adjust_room(skb, -olen, BPF_ADJ_ROOM_MAC,
+ BPF_F_ADJ_ROOM_FIXED_GSO))
return TC_ACT_SHOT;
return TC_ACT_OK;
ip -netns "${ns1}" -6 addr add "${ns1_v6}/64" dev veth1 nodad
ip -netns "${ns2}" -6 addr add "${ns2_v6}/64" dev veth2 nodad
+ # clamp route to reserve room for tunnel headers
+ ip -netns "${ns1}" -4 route flush table main
+ ip -netns "${ns1}" -6 route flush table main
+ ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1476 dev veth1
+ ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1456 dev veth1
+
sleep 1
dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 status=none