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Date: Wed, 1 Nov 2023 14:57:51 -0700
From: Daniel Xu <dxu@...uu.xyz>
To: shuah@...nel.org,
kuba@...nel.org,
hawk@...nel.org,
daniel@...earbox.net,
ast@...nel.org,
andrii@...nel.org,
john.fastabend@...il.com,
davem@...emloft.net,
steffen.klassert@...unet.com,
antony.antony@...unet.com
Cc: martin.lau@...ux.dev,
song@...nel.org,
yonghong.song@...ux.dev,
kpsingh@...nel.org,
sdf@...gle.com,
haoluo@...gle.com,
jolsa@...nel.org,
mykolal@...com,
bpf@...r.kernel.org,
linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org,
netdev@...r.kernel.org,
devel@...ux-ipsec.org
Subject: [RFCv2 bpf-next 7/7] bpf: xfrm: Add selftest for bpf_xdp_get_xfrm_state()
This commit extends test_tunnel selftest to test the new XDP xfrm state
lookup kfunc.
Co-developed-by: Antony Antony <antony.antony@...unet.com>
Signed-off-by: Antony Antony <antony.antony@...unet.com>
Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
.../selftests/bpf/progs/test_tunnel_kern.c | 49 +++++++++++++++++++
tools/testing/selftests/bpf/test_tunnel.sh | 12 +++--
2 files changed, 57 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
index ec7e04e012ae..17bf9ce28460 100644
--- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
@@ -35,6 +35,10 @@ int bpf_skb_set_fou_encap(struct __sk_buff *skb_ctx,
struct bpf_fou_encap *encap, int type) __ksym;
int bpf_skb_get_fou_encap(struct __sk_buff *skb_ctx,
struct bpf_fou_encap *encap) __ksym;
+struct xfrm_state *
+bpf_xdp_get_xfrm_state(struct xdp_md *ctx, struct bpf_xfrm_state_opts *opts,
+ u32 opts__sz) __ksym;
+void bpf_xdp_xfrm_state_release(struct xfrm_state *x) __ksym;
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
@@ -948,4 +952,49 @@ int xfrm_get_state(struct __sk_buff *skb)
return TC_ACT_OK;
}
+SEC("xdp")
+int xfrm_get_state_xdp(struct xdp_md *xdp)
+{
+ struct bpf_xfrm_state_opts opts = {};
+ struct xfrm_state *x = NULL;
+ struct ip_esp_hdr *esph;
+ struct bpf_dynptr ptr;
+ u8 esph_buf[8] = {};
+ u8 iph_buf[20] = {};
+ struct iphdr *iph;
+ u32 off;
+
+ if (bpf_dynptr_from_xdp(xdp, 0, &ptr))
+ goto out;
+
+ off = sizeof(struct ethhdr);
+ iph = bpf_dynptr_slice(&ptr, off, iph_buf, sizeof(iph_buf));
+ if (!iph || iph->protocol != IPPROTO_ESP)
+ goto out;
+
+ off += sizeof(struct iphdr);
+ esph = bpf_dynptr_slice(&ptr, off, esph_buf, sizeof(esph_buf));
+ if (!esph)
+ goto out;
+
+ opts.netns_id = BPF_F_CURRENT_NETNS,
+ opts.daddr.a4 = iph->daddr;
+ opts.spi = esph->spi;
+ opts.proto = IPPROTO_ESP;
+ opts.family = AF_INET;
+
+ x = bpf_xdp_get_xfrm_state(xdp, &opts, sizeof(opts));
+ if (!x || opts.error)
+ goto out;
+
+ if (!x->replay_esn)
+ goto out;
+
+ bpf_printk("replay-window %d\n", x->replay_esn->replay_window);
+out:
+ if (x)
+ bpf_xdp_xfrm_state_release(x);
+ return XDP_PASS;
+}
+
char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/test_tunnel.sh b/tools/testing/selftests/bpf/test_tunnel.sh
index dd3c79129e87..17d263681c71 100755
--- a/tools/testing/selftests/bpf/test_tunnel.sh
+++ b/tools/testing/selftests/bpf/test_tunnel.sh
@@ -528,7 +528,7 @@ setup_xfrm_tunnel()
# at_ns0 -> root
ip netns exec at_ns0 \
ip xfrm state add src 172.16.1.100 dst 172.16.1.200 proto esp \
- spi $spi_in_to_out reqid 1 mode tunnel \
+ spi $spi_in_to_out reqid 1 mode tunnel replay-window 42 \
auth-trunc 'hmac(sha1)' $auth 96 enc 'cbc(aes)' $enc
ip netns exec at_ns0 \
ip xfrm policy add src 10.1.1.100/32 dst 10.1.1.200/32 dir out \
@@ -537,7 +537,7 @@ setup_xfrm_tunnel()
# root -> at_ns0
ip netns exec at_ns0 \
ip xfrm state add src 172.16.1.200 dst 172.16.1.100 proto esp \
- spi $spi_out_to_in reqid 2 mode tunnel \
+ spi $spi_out_to_in reqid 2 mode tunnel replay-window 42 \
auth-trunc 'hmac(sha1)' $auth 96 enc 'cbc(aes)' $enc
ip netns exec at_ns0 \
ip xfrm policy add src 10.1.1.200/32 dst 10.1.1.100/32 dir in \
@@ -553,14 +553,14 @@ setup_xfrm_tunnel()
# root namespace
# at_ns0 -> root
ip xfrm state add src 172.16.1.100 dst 172.16.1.200 proto esp \
- spi $spi_in_to_out reqid 1 mode tunnel \
+ spi $spi_in_to_out reqid 1 mode tunnel replay-window 42 \
auth-trunc 'hmac(sha1)' $auth 96 enc 'cbc(aes)' $enc
ip xfrm policy add src 10.1.1.100/32 dst 10.1.1.200/32 dir in \
tmpl src 172.16.1.100 dst 172.16.1.200 proto esp reqid 1 \
mode tunnel
# root -> at_ns0
ip xfrm state add src 172.16.1.200 dst 172.16.1.100 proto esp \
- spi $spi_out_to_in reqid 2 mode tunnel \
+ spi $spi_out_to_in reqid 2 mode tunnel replay-window 42 \
auth-trunc 'hmac(sha1)' $auth 96 enc 'cbc(aes)' $enc
ip xfrm policy add src 10.1.1.200/32 dst 10.1.1.100/32 dir out \
tmpl src 172.16.1.200 dst 172.16.1.100 proto esp reqid 2 \
@@ -585,6 +585,8 @@ test_xfrm_tunnel()
tc qdisc add dev veth1 clsact
tc filter add dev veth1 proto ip ingress bpf da object-pinned \
${BPF_PIN_TUNNEL_DIR}/xfrm_get_state
+ ip link set dev veth1 xdpdrv pinned \
+ ${BPF_PIN_TUNNEL_DIR}/xfrm_get_state_xdp
ip netns exec at_ns0 ping $PING_ARG 10.1.1.200
sleep 1
grep "reqid 1" ${TRACE}
@@ -593,6 +595,8 @@ test_xfrm_tunnel()
check_err $?
grep "remote ip 0xac100164" ${TRACE}
check_err $?
+ grep "replay-window 42" ${TRACE}
+ check_err $?
cleanup
if [ $ret -ne 0 ]; then
--
2.42.0
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