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Commit 6f6d33f3 authored by John Fastabend's avatar John Fastabend Committed by David S. Miller
Browse files

bpf: selftests add sockmap tests 



This generates a set of sockets, attaches BPF programs, and sends some
simple traffic using basic send/recv pattern. Additionally, we do a bunch
of negative tests to ensure adding/removing socks out of the sockmap fail
correctly.

Signed-off-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 41bc94f5

tools/lib/bpf/libbpf.c

+29 −0
Original line number Diff line number Diff line
@@ -1744,3 +1744,32 @@ long libbpf_get_error(const void *ptr) 
		return PTR_ERR(ptr);

	return 0;

}



int bpf_prog_load(const char *file, enum bpf_prog_type type,

		  struct bpf_object **pobj, int *prog_fd)

{

	struct bpf_program *prog;

	struct bpf_object *obj;

	int err;



	obj = bpf_object__open(file);

	if (IS_ERR(obj))

		return -ENOENT;



	prog = bpf_program__next(NULL, obj);

	if (!prog) {

		bpf_object__close(obj);

		return -ENOENT;

	}



	bpf_program__set_type(prog, type);

	err = bpf_object__load(obj);

	if (err) {

		bpf_object__close(obj);

		return -EINVAL;

	}



	*pobj = obj;

	*prog_fd = bpf_program__fd(prog);

	return 0;

}

tools/lib/bpf/libbpf.h

+2 −0
Original line number Diff line number Diff line
@@ -243,4 +243,6 @@ int bpf_map__pin(struct bpf_map *map, const char *path); 


long libbpf_get_error(const void *ptr);



int bpf_prog_load(const char *file, enum bpf_prog_type type,

		  struct bpf_object **pobj, int *prog_fd);

#endif

tools/testing/selftests/bpf/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -15,7 +15,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test 
	test_align



TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test_obj_id.o \

	test_pkt_md_access.o test_xdp_redirect.o

	test_pkt_md_access.o test_xdp_redirect.o sockmap_parse_prog.o sockmap_verdict_prog.o



TEST_PROGS := test_kmod.sh test_xdp_redirect.sh

tools/testing/selftests/bpf/sockmap_parse_prog.c

0 → 100644
+38 −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_skb1")

int bpf_prog1(struct __sk_buff *skb)

{

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

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

	__u32 lport = skb->local_port;

	__u32 rport = skb->remote_port;

	char *d = data;



	if (data + 8 > data_end)

		return skb->len;



	/* 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[0] = 1;



	bpf_printk("data[0] = (%u): local_port %i remote %i\n",

		   d[0], lport, bpf_ntohl(rport));

	return skb->len;

}



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

tools/testing/selftests/bpf/sockmap_verdict_prog.c

0 → 100644
+48 −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__);			\

})



struct bpf_map_def SEC("maps") sock_map = {

	.type = BPF_MAP_TYPE_SOCKMAP,

	.key_size = sizeof(int),

	.value_size = sizeof(int),

	.max_entries = 20,

};



SEC("sk_skb2")

int bpf_prog2(struct __sk_buff *skb)

{

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

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

	__u32 lport = skb->local_port;

	__u32 rport = skb->remote_port;

	char *d = data;



	if (data + 8 > data_end)

		return SK_DROP;



	d[0] = 0xd;

	d[1] = 0xe;

	d[2] = 0xa;

	d[3] = 0xd;

	d[4] = 0xb;

	d[5] = 0xe;

	d[6] = 0xe;

	d[7] = 0xf;



	bpf_printk("data[0] = (%u): local_port %i remote %i\n",

		   d[0], lport, bpf_ntohl(rport));

	return bpf_sk_redirect_map(&sock_map, 5, 0);

}



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