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bpf: xfrm: Add selftest for bpf_xdp_get_xfrm_state()

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This commit extends test_tunnel selftest to test the new XDP xfrm state
lookup kfunc.

Co-developed-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Link: https://lore.kernel.org/r/e704e9a4332e3eac7b458e4bfdec8fcc6984cdb6.1702593901.git.dxu@dxuuu.xyz
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Xu
2023-12-14 15:49:06 -07:00
committed by Alexei Starovoitov
parent e7adc8291a
commit 2cd07b0eb0
2 changed files with 65 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tools/testing/selftests/bpf/prog_tests/test_tunnel.c
+14 -2
View File
@@ -278,7 +278,7 @@ static int add_xfrm_tunnel(void)
SYS(fail,
"ip netns exec at_ns0 "
"ip xfrm state add src %s dst %s proto esp "
"spi %d reqid 1 mode tunnel "
"spi %d reqid 1 mode tunnel replay-window 42 "
"auth-trunc 'hmac(sha1)' %s 96 enc 'cbc(aes)' %s",
IP4_ADDR_VETH0, IP4_ADDR1_VETH1, XFRM_SPI_IN_TO_OUT, XFRM_AUTH, XFRM_ENC);
SYS(fail,
@@ -313,7 +313,7 @@ static int add_xfrm_tunnel(void)
*/
SYS(fail,
"ip xfrm state add src %s dst %s proto esp "
"spi %d reqid 1 mode tunnel "
"spi %d reqid 1 mode tunnel replay-window 42 "
"auth-trunc 'hmac(sha1)' %s 96 enc 'cbc(aes)' %s",
IP4_ADDR_VETH0, IP4_ADDR1_VETH1, XFRM_SPI_IN_TO_OUT, XFRM_AUTH, XFRM_ENC);
SYS(fail,
@@ -628,8 +628,10 @@ static void test_xfrm_tunnel(void)
{
DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook,
.attach_point = BPF_TC_INGRESS);
LIBBPF_OPTS(bpf_xdp_attach_opts, opts);
struct test_tunnel_kern *skel = NULL;
struct nstoken *nstoken;
int xdp_prog_fd;
int tc_prog_fd;
int ifindex;
int err;
@@ -654,6 +656,14 @@ static void test_xfrm_tunnel(void)
if (attach_tc_prog(&tc_hook, tc_prog_fd, -1))
goto done;
/* attach xdp prog to tunnel dev */
xdp_prog_fd = bpf_program__fd(skel->progs.xfrm_get_state_xdp);
if (!ASSERT_GE(xdp_prog_fd, 0, "bpf_program__fd"))
goto done;
err = bpf_xdp_attach(ifindex, xdp_prog_fd, XDP_FLAGS_REPLACE, &opts);
if (!ASSERT_OK(err, "bpf_xdp_attach"))
goto done;
/* ping from at_ns0 namespace test */
nstoken = open_netns("at_ns0");
err = test_ping(AF_INET, IP4_ADDR_TUNL_DEV1);
@@ -667,6 +677,8 @@ static void test_xfrm_tunnel(void)
goto done;
if (!ASSERT_EQ(skel->bss->xfrm_remote_ip, 0xac100164, "remote_ip"))
goto done;
if (!ASSERT_EQ(skel->bss->xfrm_replay_window, 42, "replay_window"))
goto done;
done:
delete_xfrm_tunnel();
tools/testing/selftests/bpf/progs/test_tunnel_kern.c
+51
View File
@@ -30,6 +30,10 @@ 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);
@@ -950,4 +954,51 @@ int xfrm_get_state(struct __sk_buff *skb)
return TC_ACT_OK;
}
volatile int xfrm_replay_window = 0;
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)
goto out;
if (!x->replay_esn)
goto out;
xfrm_replay_window = x->replay_esn->replay_window;
out:
if (x)
bpf_xdp_xfrm_state_release(x);
return XDP_PASS;
}
char _license[] SEC("license") = "GPL";