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Commit 82a86168 authored by John Fastabend's avatar John Fastabend Committed by Daniel Borkmann
Browse files

bpf: add map tests for BPF_PROG_TYPE_SK_MSG 



Add map tests to attach BPF_PROG_TYPE_SK_MSG types to a sockmap.

Signed-off-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 015632bb

tools/include/uapi/linux/bpf.h

+10 −0
Original line number Diff line number Diff line
@@ -133,6 +133,7 @@ enum bpf_prog_type { 
	BPF_PROG_TYPE_SOCK_OPS,

	BPF_PROG_TYPE_SK_SKB,

	BPF_PROG_TYPE_CGROUP_DEVICE,

	BPF_PROG_TYPE_SK_MSG,

};



enum bpf_attach_type {
@@ -143,6 +144,7 @@ enum bpf_attach_type { 
	BPF_SK_SKB_STREAM_PARSER,

	BPF_SK_SKB_STREAM_VERDICT,

	BPF_CGROUP_DEVICE,

	BPF_SK_MSG_VERDICT,

	__MAX_BPF_ATTACH_TYPE

};
@@ -941,6 +943,14 @@ enum sk_action { 
	SK_PASS,

};



/* user accessible metadata for SK_MSG packet hook, new fields must

 * be added to the end of this structure

 */

struct sk_msg_md {

	void *data;

	void *data_end;

};



#define BPF_TAG_SIZE	8



struct bpf_prog_info {

tools/testing/selftests/bpf/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -29,7 +29,8 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test 
	test_pkt_md_access.o test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o     \

	sockmap_verdict_prog.o dev_cgroup.o sample_ret0.o test_tracepoint.o \

	test_l4lb_noinline.o test_xdp_noinline.o test_stacktrace_map.o \

	sample_map_ret0.o test_tcpbpf_kern.o test_stacktrace_build_id.o

	sample_map_ret0.o test_tcpbpf_kern.o test_stacktrace_build_id.o \

	sockmap_tcp_msg_prog.o



# Order correspond to 'make run_tests' order

TEST_PROGS := test_kmod.sh \

tools/testing/selftests/bpf/bpf_helpers.h

+2 −0
Original line number Diff line number Diff line
@@ -123,6 +123,8 @@ static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) = 
	(void *) BPF_FUNC_skb_under_cgroup;

static int (*bpf_skb_change_head)(void *, int len, int flags) =

	(void *) BPF_FUNC_skb_change_head;

static int (*bpf_skb_pull_data)(void *, int len) =

	(void *) BPF_FUNC_skb_pull_data;



/* Scan the ARCH passed in from ARCH env variable (see Makefile) */

#if defined(__TARGET_ARCH_x86)

tools/testing/selftests/bpf/sockmap_parse_prog.c

+13 −2
Original line number Diff line number Diff line
@@ -20,14 +20,25 @@ int bpf_prog1(struct __sk_buff *skb) 
	__u32 lport = skb->local_port;

	__u32 rport = skb->remote_port;

	__u8 *d = data;

	__u32 len = (__u32) data_end - (__u32) data;

	int err;



	if (data + 10 > data_end) {

		err = bpf_skb_pull_data(skb, 10);

		if (err)

			return SK_DROP;



		data_end = (void *)(long)skb->data_end;

		data = (void *)(long)skb->data;

		if (data + 10 > data_end)

		return skb->len;

			return SK_DROP;

	}



	/* This write/read is a bit pointless but tests the verifier and

	 * strparser handler for read/write pkt data and access into sk

	 * fields.

	 */

	d = data;

	d[7] = 1;

	return skb->len;

}

tools/testing/selftests/bpf/sockmap_tcp_msg_prog.c

0 → 100644
+33 −0
Original line number Diff line number Diff line 
#include <linux/bpf.h>

#include "bpf_helpers.h"

#include "bpf_util.h"

#include "bpf_endian.h"



int _version SEC("version") = 1;



#define bpf_printk(fmt, ...)					\

({								\

	       char ____fmt[] = fmt;				\

	       bpf_trace_printk(____fmt, sizeof(____fmt),	\

				##__VA_ARGS__);			\

})



SEC("sk_msg1")

int bpf_prog1(struct sk_msg_md *msg)

{

	void *data_end = (void *)(long) msg->data_end;

	void *data = (void *)(long) msg->data;



	char *d;



	if (data + 8 > data_end)

		return SK_DROP;



	bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data);

	d = (char *)data;

	bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]);



	return SK_PASS;

}



char _license[] SEC("license") = "GPL";