Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 177 insertions, 0 deletions

diff --git a/samples/bpf/test_cgrp2_attach.c b/samples/bpf/test_cgrp2_attach.c
new file mode 100644
index 000000000..68ce69457
--- /dev/null
+++ b/samples/bpf/test_cgrp2_attach.c
@@ -0,0 +1,177 @@
+/* eBPF example program:
+ *
+ * - Creates arraymap in kernel with 4 bytes keys and 8 byte values
+ *
+ * - Loads eBPF program
+ *
+ *   The eBPF program accesses the map passed in to store two pieces of
+ *   information. The number of invocations of the program, which maps
+ *   to the number of packets received, is stored to key 0. Key 1 is
+ *   incremented on each iteration by the number of bytes stored in
+ *   the skb.
+ *
+ * - Attaches the new program to a cgroup using BPF_PROG_ATTACH
+ *
+ * - Every second, reads map[0] and map[1] to see how many bytes and
+ *   packets were seen on any socket of tasks in the given cgroup.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <linux/bpf.h>
+#include <bpf/bpf.h>
+
+#include "bpf_insn.h"
+#include "bpf_util.h"
+
+enum {
+	MAP_KEY_PACKETS,
+	MAP_KEY_BYTES,
+};
+
+char bpf_log_buf[BPF_LOG_BUF_SIZE];
+
+static int prog_load(int map_fd, int verdict)
+{
+	struct bpf_insn prog[] = {
+		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), /* save r6 so it's not clobbered by BPF_CALL */
+
+		/* Count packets */
+		BPF_MOV64_IMM(BPF_REG_0, MAP_KEY_PACKETS), /* r0 = 0 */
+		BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4), /* *(u32 *)(fp - 4) = r0 */
+		BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+		BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), /* r2 = fp - 4 */
+		BPF_LD_MAP_FD(BPF_REG_1, map_fd), /* load map fd to r1 */
+		BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
+		BPF_MOV64_IMM(BPF_REG_1, 1), /* r1 = 1 */
+		BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
+
+		/* Count bytes */
+		BPF_MOV64_IMM(BPF_REG_0, MAP_KEY_BYTES), /* r0 = 1 */
+		BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4), /* *(u32 *)(fp - 4) = r0 */
+		BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+		BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), /* r2 = fp - 4 */
+		BPF_LD_MAP_FD(BPF_REG_1, map_fd),
+		BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
+		BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6, offsetof(struct __sk_buff, len)), /* r1 = skb->len */
+
+		BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
+
+		BPF_MOV64_IMM(BPF_REG_0, verdict), /* r0 = verdict */
+		BPF_EXIT_INSN(),
+	};
+	size_t insns_cnt = ARRAY_SIZE(prog);
+	LIBBPF_OPTS(bpf_prog_load_opts, opts,
+		.log_buf = bpf_log_buf,
+		.log_size = BPF_LOG_BUF_SIZE,
+	);
+
+	return bpf_prog_load(BPF_PROG_TYPE_CGROUP_SKB, NULL, "GPL",
+			     prog, insns_cnt, &opts);
+}
+
+static int usage(const char *argv0)
+{
+	printf("Usage: %s [-d] [-D] <cg-path> <egress|ingress>\n", argv0);
+	printf("	-d	Drop Traffic\n");
+	printf("	-D	Detach filter, and exit\n");
+	return EXIT_FAILURE;
+}
+
+static int attach_filter(int cg_fd, int type, int verdict)
+{
+	int prog_fd, map_fd, ret, key;
+	long long pkt_cnt, byte_cnt;
+
+	map_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL,
+				sizeof(key), sizeof(byte_cnt),
+				256, NULL);
+	if (map_fd < 0) {
+		printf("Failed to create map: '%s'\n", strerror(errno));
+		return EXIT_FAILURE;
+	}
+
+	prog_fd = prog_load(map_fd, verdict);
+	printf("Output from kernel verifier:\n%s\n-------\n", bpf_log_buf);
+
+	if (prog_fd < 0) {
+		printf("Failed to load prog: '%s'\n", strerror(errno));
+		return EXIT_FAILURE;
+	}
+
+	ret = bpf_prog_attach(prog_fd, cg_fd, type, 0);
+	if (ret < 0) {
+		printf("Failed to attach prog to cgroup: '%s'\n",
+		       strerror(errno));
+		return EXIT_FAILURE;
+	}
+	while (1) {
+		key = MAP_KEY_PACKETS;
+		assert(bpf_map_lookup_elem(map_fd, &key, &pkt_cnt) == 0);
+
+		key = MAP_KEY_BYTES;
+		assert(bpf_map_lookup_elem(map_fd, &key, &byte_cnt) == 0);
+
+		printf("cgroup received %lld packets, %lld bytes\n",
+		       pkt_cnt, byte_cnt);
+		sleep(1);
+	}
+
+	return EXIT_SUCCESS;
+}
+
+int main(int argc, char **argv)
+{
+	int detach_only = 0, verdict = 1;
+	enum bpf_attach_type type;
+	int opt, cg_fd, ret;
+
+	while ((opt = getopt(argc, argv, "Dd")) != -1) {
+		switch (opt) {
+		case 'd':
+			verdict = 0;
+			break;
+		case 'D':
+			detach_only = 1;
+			break;
+		default:
+			return usage(argv[0]);
+		}
+	}
+
+	if (argc - optind < 2)
+		return usage(argv[0]);
+
+	if (strcmp(argv[optind + 1], "ingress") == 0)
+		type = BPF_CGROUP_INET_INGRESS;
+	else if (strcmp(argv[optind + 1], "egress") == 0)
+		type = BPF_CGROUP_INET_EGRESS;
+	else
+		return usage(argv[0]);
+
+	cg_fd = open(argv[optind], O_DIRECTORY | O_RDONLY);
+	if (cg_fd < 0) {
+		printf("Failed to open cgroup path: '%s'\n", strerror(errno));
+		return EXIT_FAILURE;
+	}
+
+	if (detach_only) {
+		ret = bpf_prog_detach(cg_fd, type);
+		printf("bpf_prog_detach() returned '%s' (%d)\n",
+		       strerror(errno), errno);
+	} else
+		ret = attach_filter(cg_fd, type, verdict);
+
+	return ret;
+}