selftests/bpf: convert bpf tunnel test to BPF_F_ADJ_ROOM_FIXED_GSO
Lower route MTU to ensure packets fit in device MTU after encap, then skip the gso_size changes. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -52,6 +52,7 @@ static __always_inline int encap_ipv4(struct __sk_buff *skb, bool with_gre)
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struct grev4hdr h_outer;
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struct iphdr iph_inner;
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struct tcphdr tcph;
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__u64 flags;
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int olen;
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if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_inner,
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@ -69,10 +70,11 @@ static __always_inline int encap_ipv4(struct __sk_buff *skb, bool with_gre)
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if (tcph.dest != __bpf_constant_htons(cfg_port))
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return TC_ACT_OK;
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flags = BPF_F_ADJ_ROOM_FIXED_GSO;
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olen = with_gre ? sizeof(h_outer) : sizeof(h_outer.ip);
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/* add room between mac and network header */
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if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, 0))
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if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
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return TC_ACT_SHOT;
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/* prepare new outer network header */
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@ -102,6 +104,7 @@ static __always_inline int encap_ipv6(struct __sk_buff *skb, bool with_gre)
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struct ipv6hdr iph_inner;
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struct grev6hdr h_outer;
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struct tcphdr tcph;
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__u64 flags;
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int olen;
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if (bpf_skb_load_bytes(skb, ETH_HLEN, &iph_inner,
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@ -116,10 +119,11 @@ static __always_inline int encap_ipv6(struct __sk_buff *skb, bool with_gre)
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if (tcph.dest != __bpf_constant_htons(cfg_port))
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return TC_ACT_OK;
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flags = BPF_F_ADJ_ROOM_FIXED_GSO;
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olen = with_gre ? sizeof(h_outer) : sizeof(h_outer.ip);
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/* add room between mac and network header */
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if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, 0))
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if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
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return TC_ACT_SHOT;
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/* prepare new outer network header */
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@ -195,7 +199,8 @@ static int decap_internal(struct __sk_buff *skb, int off, int len, char proto)
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return TC_ACT_OK;
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}
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if (bpf_skb_adjust_room(skb, -olen, BPF_ADJ_ROOM_MAC, 0))
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if (bpf_skb_adjust_room(skb, -olen, BPF_ADJ_ROOM_MAC,
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BPF_F_ADJ_ROOM_FIXED_GSO))
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return TC_ACT_SHOT;
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return TC_ACT_OK;
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@ -35,6 +35,12 @@ setup() {
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ip -netns "${ns1}" -6 addr add "${ns1_v6}/64" dev veth1 nodad
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ip -netns "${ns2}" -6 addr add "${ns2_v6}/64" dev veth2 nodad
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# clamp route to reserve room for tunnel headers
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ip -netns "${ns1}" -4 route flush table main
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ip -netns "${ns1}" -6 route flush table main
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ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1476 dev veth1
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ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1456 dev veth1
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sleep 1
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dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 status=none
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