selftests/bpf: Integrate test_tc_tunnel.sh tests into test_progs

The test_tc_tunnel.sh script checks that a large variety of tunneling
mechanisms handled by the kernel can be handled as well by eBPF
programs. While this test shares similarities with test_tunnel.c (which
is already integrated in test_progs), those are testing slightly
different things:
- test_tunnel.c creates a tunnel interface, and then get and set tunnel
  keys in packet metadata, from BPF programs.
- test_tc_tunnels.sh manually parses/crafts packets content

Bring the tests covered by test_tc_tunnel.sh into the test_progs
framework, by creating a dedicated test_tc_tunnel.sh. This new test
defines a "generic" runner which, for each test configuration:
- will configure the relevant veth pair, each of those isolated in a
  dedicated namespace
- will check that traffic will fail if there is only an encapsulating
  program attached to one veth egress
- will check that traffic succeed if we enable some decapsulation module
  on kernel side
- will check that traffic still succeeds if we replace the kernel
  decapsulation with some eBPF ingress decapsulation.

Example of the new test execution:

  # ./test_progs -a tc_tunnel
  #447/1   tc_tunnel/ipip_none:OK
  #447/2   tc_tunnel/ipip6_none:OK
  #447/3   tc_tunnel/ip6tnl_none:OK
  #447/4   tc_tunnel/sit_none:OK
  #447/5   tc_tunnel/vxlan_eth:OK
  #447/6   tc_tunnel/ip6vxlan_eth:OK
  #447/7   tc_tunnel/gre_none:OK
  #447/8   tc_tunnel/gre_eth:OK
  #447/9   tc_tunnel/gre_mpls:OK
  #447/10  tc_tunnel/ip6gre_none:OK
  #447/11  tc_tunnel/ip6gre_eth:OK
  #447/12  tc_tunnel/ip6gre_mpls:OK
  #447/13  tc_tunnel/udp_none:OK
  #447/14  tc_tunnel/udp_eth:OK
  #447/15  tc_tunnel/udp_mpls:OK
  #447/16  tc_tunnel/ip6udp_none:OK
  #447/17  tc_tunnel/ip6udp_eth:OK
  #447/18  tc_tunnel/ip6udp_mpls:OK
  #447     tc_tunnel:OK
  Summary: 1/18 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20251027-tc_tunnel-v3-3-505c12019f9d@bootlin.com

1 files changed, 19 insertions, 19 deletions

diff --git a/tools/testing/selftests/bpf/progs/test_tc_tunnel.c b/tools/testing/selftests/bpf/progs/test_tc_tunnel.c
index b509e4c99648..7330c61b5730 100644
--- a/tools/testing/selftests/bpf/progs/test_tc_tunnel.c
+++ b/tools/testing/selftests/bpf/progs/test_tc_tunnel.c
@@ -418,7 +418,7 @@ static __always_inline int encap_ipv6(struct __sk_buff *skb, __u8 encap_proto,
 	return __encap_ipv6(skb, encap_proto, l2_proto, 0);
 }
 
-SEC("encap_ipip_none")
+SEC("tc")
 int __encap_ipip_none(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -427,7 +427,7 @@ int __encap_ipip_none(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_gre_none")
+SEC("tc")
 int __encap_gre_none(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -436,7 +436,7 @@ int __encap_gre_none(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_gre_mpls")
+SEC("tc")
 int __encap_gre_mpls(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -445,7 +445,7 @@ int __encap_gre_mpls(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_gre_eth")
+SEC("tc")
 int __encap_gre_eth(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -454,7 +454,7 @@ int __encap_gre_eth(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_udp_none")
+SEC("tc")
 int __encap_udp_none(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -463,7 +463,7 @@ int __encap_udp_none(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_udp_mpls")
+SEC("tc")
 int __encap_udp_mpls(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -472,7 +472,7 @@ int __encap_udp_mpls(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_udp_eth")
+SEC("tc")
 int __encap_udp_eth(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -481,7 +481,7 @@ int __encap_udp_eth(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_vxlan_eth")
+SEC("tc")
 int __encap_vxlan_eth(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -492,7 +492,7 @@ int __encap_vxlan_eth(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_sit_none")
+SEC("tc")
 int __encap_sit_none(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -501,7 +501,7 @@ int __encap_sit_none(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ip6tnl_none")
+SEC("tc")
 int __encap_ip6tnl_none(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -510,7 +510,7 @@ int __encap_ip6tnl_none(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ipip6_none")
+SEC("tc")
 int __encap_ipip6_none(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IP))
@@ -519,7 +519,7 @@ int __encap_ipip6_none(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ip6gre_none")
+SEC("tc")
 int __encap_ip6gre_none(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -528,7 +528,7 @@ int __encap_ip6gre_none(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ip6gre_mpls")
+SEC("tc")
 int __encap_ip6gre_mpls(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -537,7 +537,7 @@ int __encap_ip6gre_mpls(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ip6gre_eth")
+SEC("tc")
 int __encap_ip6gre_eth(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -546,7 +546,7 @@ int __encap_ip6gre_eth(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ip6udp_none")
+SEC("tc")
 int __encap_ip6udp_none(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -555,7 +555,7 @@ int __encap_ip6udp_none(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ip6udp_mpls")
+SEC("tc")
 int __encap_ip6udp_mpls(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -564,7 +564,7 @@ int __encap_ip6udp_mpls(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ip6udp_eth")
+SEC("tc")
 int __encap_ip6udp_eth(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -573,7 +573,7 @@ int __encap_ip6udp_eth(struct __sk_buff *skb)
 		return TC_ACT_OK;
 }
 
-SEC("encap_ip6vxlan_eth")
+SEC("tc")
 int __encap_ip6vxlan_eth(struct __sk_buff *skb)
 {
 	if (skb->protocol == __bpf_constant_htons(ETH_P_IPV6))
@@ -680,7 +680,7 @@ static int decap_ipv6(struct __sk_buff *skb)
 			      iph_outer.nexthdr);
 }
 
-SEC("decap")
+SEC("tc")
 int decap_f(struct __sk_buff *skb)
 {
 	switch (skb->protocol) {