95348e463e
Add a test case to assert that the skb->pkt_type which was set from the BPF program is retained from the netkit xmit side to the peer's device at tcx ingress location. # ./vmtest.sh -- ./test_progs -t netkit [...] ./test_progs -t netkit [ 1.140780] bpf_testmod: loading out-of-tree module taints kernel. [ 1.141127] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel [ 1.284601] tsc: Refined TSC clocksource calibration: 3408.006 MHz [ 1.286672] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fd9b189d, max_idle_ns: 440795225691 ns [ 1.290384] clocksource: Switched to clocksource tsc #345 tc_netkit_basic:OK #346 tc_netkit_device:OK #347 tc_netkit_multi_links:OK #348 tc_netkit_multi_opts:OK #349 tc_netkit_neigh_links:OK #350 tc_netkit_pkt_type:OK Summary: 6/0 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/r/20240524163619.26001-4-daniel@iogearbox.net Signed-off-by: Alexei Starovoitov <ast@kernel.org>
102 lines
1.8 KiB
C
102 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2023 Isovalent */
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#include <stdbool.h>
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#include <linux/bpf.h>
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#include <linux/if_ether.h>
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#include <linux/stddef.h>
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#include <linux/if_packet.h>
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#include <bpf/bpf_endian.h>
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#include <bpf/bpf_helpers.h>
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char LICENSE[] SEC("license") = "GPL";
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bool seen_tc1;
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bool seen_tc2;
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bool seen_tc3;
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bool seen_tc4;
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bool seen_tc5;
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bool seen_tc6;
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bool seen_tc7;
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bool set_type;
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bool seen_eth;
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bool seen_host;
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bool seen_mcast;
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SEC("tc/ingress")
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int tc1(struct __sk_buff *skb)
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{
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struct ethhdr eth = {};
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if (skb->protocol != __bpf_constant_htons(ETH_P_IP))
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goto out;
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if (bpf_skb_load_bytes(skb, 0, ð, sizeof(eth)))
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goto out;
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seen_eth = eth.h_proto == bpf_htons(ETH_P_IP);
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seen_host = skb->pkt_type == PACKET_HOST;
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if (seen_host && set_type) {
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eth.h_dest[0] = 4;
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if (bpf_skb_store_bytes(skb, 0, ð, sizeof(eth), 0))
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goto fail;
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bpf_skb_change_type(skb, PACKET_MULTICAST);
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}
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out:
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seen_tc1 = true;
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fail:
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return TCX_NEXT;
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}
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SEC("tc/egress")
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int tc2(struct __sk_buff *skb)
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{
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seen_tc2 = true;
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return TCX_NEXT;
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}
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SEC("tc/egress")
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int tc3(struct __sk_buff *skb)
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{
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seen_tc3 = true;
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return TCX_NEXT;
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}
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SEC("tc/egress")
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int tc4(struct __sk_buff *skb)
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{
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seen_tc4 = true;
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return TCX_NEXT;
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}
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SEC("tc/egress")
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int tc5(struct __sk_buff *skb)
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{
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seen_tc5 = true;
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return TCX_PASS;
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}
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SEC("tc/egress")
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int tc6(struct __sk_buff *skb)
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{
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seen_tc6 = true;
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return TCX_PASS;
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}
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SEC("tc/ingress")
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int tc7(struct __sk_buff *skb)
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{
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struct ethhdr eth = {};
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if (skb->protocol != __bpf_constant_htons(ETH_P_IP))
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goto out;
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if (bpf_skb_load_bytes(skb, 0, ð, sizeof(eth)))
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goto out;
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if (eth.h_dest[0] == 4 && set_type) {
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seen_mcast = skb->pkt_type == PACKET_MULTICAST;
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bpf_skb_change_type(skb, PACKET_HOST);
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}
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out:
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seen_tc7 = true;
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return TCX_PASS;
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}
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