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authorAlexei Starovoitov <ast@kernel.org>2020-11-10 19:12:12 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2020-11-13 01:42:11 +0100
commit9cc873e85800ccde80aa2e4b2bae9f1b5fa4c478 (patch)
treee9183f1afc6a33f13414fe68d6fd39cf816561d6 /tools
parent6d94e741a8ff818e5518da8257f5ca0aaed1f269 (diff)
selftests/bpf: Add skb_pkt_end test
Add a test that currently makes LLVM generate assembly code: $ llvm-objdump -S skb_pkt_end.o 0000000000000000 <main_prog>: ; if (skb_shorter(skb, ETH_IPV4_TCP_SIZE)) 0: 61 12 50 00 00 00 00 00 r2 = *(u32 *)(r1 + 80) 1: 61 14 4c 00 00 00 00 00 r4 = *(u32 *)(r1 + 76) 2: bf 43 00 00 00 00 00 00 r3 = r4 3: 07 03 00 00 36 00 00 00 r3 += 54 4: b7 01 00 00 00 00 00 00 r1 = 0 5: 2d 23 02 00 00 00 00 00 if r3 > r2 goto +2 <LBB0_2> 6: 07 04 00 00 0e 00 00 00 r4 += 14 ; if (skb_shorter(skb, ETH_IPV4_TCP_SIZE)) 7: bf 41 00 00 00 00 00 00 r1 = r4 0000000000000040 <LBB0_2>: 8: b4 00 00 00 ff ff ff ff w0 = -1 ; if (!(ip = get_iphdr(skb))) 9: 2d 23 05 00 00 00 00 00 if r3 > r2 goto +5 <LBB0_6> ; proto = ip->protocol; 10: 71 12 09 00 00 00 00 00 r2 = *(u8 *)(r1 + 9) ; if (proto != IPPROTO_TCP) 11: 56 02 03 00 06 00 00 00 if w2 != 6 goto +3 <LBB0_6> ; if (tcp->dest != 0) 12: 69 12 16 00 00 00 00 00 r2 = *(u16 *)(r1 + 22) 13: 56 02 01 00 00 00 00 00 if w2 != 0 goto +1 <LBB0_6> ; return tcp->urg_ptr; 14: 69 10 26 00 00 00 00 00 r0 = *(u16 *)(r1 + 38) 0000000000000078 <LBB0_6>: ; } 15: 95 00 00 00 00 00 00 00 exit Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20201111031213.25109-3-alexei.starovoitov@gmail.com
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/bpf/prog_tests/test_skb_pkt_end.c41
-rw-r--r--tools/testing/selftests/bpf/progs/skb_pkt_end.c54
2 files changed, 95 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/test_skb_pkt_end.c b/tools/testing/selftests/bpf/prog_tests/test_skb_pkt_end.c
new file mode 100644
index 000000000000..cf1215531920
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/test_skb_pkt_end.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include <test_progs.h>
+#include <network_helpers.h>
+#include "skb_pkt_end.skel.h"
+
+static int sanity_run(struct bpf_program *prog)
+{
+ __u32 duration, retval;
+ int err, prog_fd;
+
+ prog_fd = bpf_program__fd(prog);
+ err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
+ NULL, NULL, &retval, &duration);
+ if (CHECK(err || retval != 123, "test_run",
+ "err %d errno %d retval %d duration %d\n",
+ err, errno, retval, duration))
+ return -1;
+ return 0;
+}
+
+void test_test_skb_pkt_end(void)
+{
+ struct skb_pkt_end *skb_pkt_end_skel = NULL;
+ __u32 duration = 0;
+ int err;
+
+ skb_pkt_end_skel = skb_pkt_end__open_and_load();
+ if (CHECK(!skb_pkt_end_skel, "skb_pkt_end_skel_load", "skb_pkt_end skeleton failed\n"))
+ goto cleanup;
+
+ err = skb_pkt_end__attach(skb_pkt_end_skel);
+ if (CHECK(err, "skb_pkt_end_attach", "skb_pkt_end attach failed: %d\n", err))
+ goto cleanup;
+
+ if (sanity_run(skb_pkt_end_skel->progs.main_prog))
+ goto cleanup;
+
+cleanup:
+ skb_pkt_end__destroy(skb_pkt_end_skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/skb_pkt_end.c b/tools/testing/selftests/bpf/progs/skb_pkt_end.c
new file mode 100644
index 000000000000..cf6823f42e80
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/skb_pkt_end.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+#define BPF_NO_PRESERVE_ACCESS_INDEX
+#include <vmlinux.h>
+#include <bpf/bpf_core_read.h>
+#include <bpf/bpf_helpers.h>
+
+#define NULL 0
+#define INLINE __always_inline
+
+#define skb_shorter(skb, len) ((void *)(long)(skb)->data + (len) > (void *)(long)skb->data_end)
+
+#define ETH_IPV4_TCP_SIZE (14 + sizeof(struct iphdr) + sizeof(struct tcphdr))
+
+static INLINE struct iphdr *get_iphdr(struct __sk_buff *skb)
+{
+ struct iphdr *ip = NULL;
+ struct ethhdr *eth;
+
+ if (skb_shorter(skb, ETH_IPV4_TCP_SIZE))
+ goto out;
+
+ eth = (void *)(long)skb->data;
+ ip = (void *)(eth + 1);
+
+out:
+ return ip;
+}
+
+SEC("classifier/cls")
+int main_prog(struct __sk_buff *skb)
+{
+ struct iphdr *ip = NULL;
+ struct tcphdr *tcp;
+ __u8 proto = 0;
+
+ if (!(ip = get_iphdr(skb)))
+ goto out;
+
+ proto = ip->protocol;
+
+ if (proto != IPPROTO_TCP)
+ goto out;
+
+ tcp = (void*)(ip + 1);
+ if (tcp->dest != 0)
+ goto out;
+ if (!tcp)
+ goto out;
+
+ return tcp->urg_ptr;
+out:
+ return -1;
+}
+char _license[] SEC("license") = "GPL";