Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 153 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/progs/kfree_skb.c b/tools/testing/selftests/bpf/progs/kfree_skb.c
new file mode 100644
index 000000000..7236da72c
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/kfree_skb.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Facebook
+#include <linux/bpf.h>
+#include <stdbool.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+struct {
+	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
+	__type(key, int);
+	__type(value, int);
+} perf_buf_map SEC(".maps");
+
+#define _(P) (__builtin_preserve_access_index(P))
+
+/* define few struct-s that bpf program needs to access */
+struct callback_head {
+	struct callback_head *next;
+	void (*func)(struct callback_head *head);
+};
+struct dev_ifalias {
+	struct callback_head rcuhead;
+};
+
+struct net_device /* same as kernel's struct net_device */ {
+	int ifindex;
+	struct dev_ifalias *ifalias;
+};
+
+typedef struct {
+        int counter;
+} atomic_t;
+typedef struct refcount_struct {
+        atomic_t refs;
+} refcount_t;
+
+struct sk_buff {
+	/* field names and sizes should match to those in the kernel */
+	unsigned int len, data_len;
+	__u16 mac_len, hdr_len, queue_mapping;
+	struct net_device *dev;
+	/* order of the fields doesn't matter */
+	refcount_t users;
+	unsigned char *data;
+	char __pkt_type_offset[0];
+	char cb[48];
+};
+
+struct meta {
+	int ifindex;
+	__u32 cb32_0;
+	__u8 cb8_0;
+};
+
+/* TRACE_EVENT(kfree_skb,
+ *         TP_PROTO(struct sk_buff *skb, void *location),
+ */
+SEC("tp_btf/kfree_skb")
+int BPF_PROG(trace_kfree_skb, struct sk_buff *skb, void *location)
+{
+	struct net_device *dev;
+	struct callback_head *ptr;
+	void *func;
+	int users;
+	unsigned char *data;
+	unsigned short pkt_data;
+	struct meta meta = {};
+	char pkt_type;
+	__u32 *cb32;
+	__u8 *cb8;
+
+	__builtin_preserve_access_index(({
+		users = skb->users.refs.counter;
+		data = skb->data;
+		dev = skb->dev;
+		ptr = dev->ifalias->rcuhead.next;
+		func = ptr->func;
+		cb8 = (__u8 *)&skb->cb;
+		cb32 = (__u32 *)&skb->cb;
+	}));
+
+	meta.ifindex = _(dev->ifindex);
+	meta.cb8_0 = cb8[8];
+	meta.cb32_0 = cb32[2];
+
+	bpf_probe_read_kernel(&pkt_type, sizeof(pkt_type), _(&skb->__pkt_type_offset));
+	pkt_type &= 7;
+
+	/* read eth proto */
+	bpf_probe_read_kernel(&pkt_data, sizeof(pkt_data), data + 12);
+
+	bpf_printk("rcuhead.next %llx func %llx\n", ptr, func);
+	bpf_printk("skb->len %d users %d pkt_type %x\n",
+		   _(skb->len), users, pkt_type);
+	bpf_printk("skb->queue_mapping %d\n", _(skb->queue_mapping));
+	bpf_printk("dev->ifindex %d data %llx pkt_data %x\n",
+		   meta.ifindex, data, pkt_data);
+	bpf_printk("cb8_0:%x cb32_0:%x\n", meta.cb8_0, meta.cb32_0);
+
+	if (users != 1 || pkt_data != bpf_htons(0x86dd) || meta.ifindex != 1)
+		/* raw tp ignores return value */
+		return 0;
+
+	/* send first 72 byte of the packet to user space */
+	bpf_skb_output(skb, &perf_buf_map, (72ull << 32) | BPF_F_CURRENT_CPU,
+		       &meta, sizeof(meta));
+	return 0;
+}
+
+struct {
+	bool fentry_test_ok;
+	bool fexit_test_ok;
+} result = {};
+
+SEC("fentry/eth_type_trans")
+int BPF_PROG(fentry_eth_type_trans, struct sk_buff *skb, struct net_device *dev,
+	     unsigned short protocol)
+{
+	int len, ifindex;
+
+	__builtin_preserve_access_index(({
+		len = skb->len;
+		ifindex = dev->ifindex;
+	}));
+
+	/* fentry sees full packet including L2 header */
+	if (len != 74 || ifindex != 1)
+		return 0;
+	result.fentry_test_ok = true;
+	return 0;
+}
+
+SEC("fexit/eth_type_trans")
+int BPF_PROG(fexit_eth_type_trans, struct sk_buff *skb, struct net_device *dev,
+	     unsigned short protocol)
+{
+	int len, ifindex;
+
+	__builtin_preserve_access_index(({
+		len = skb->len;
+		ifindex = dev->ifindex;
+	}));
+
+	/* fexit sees packet without L2 header that eth_type_trans should have
+	 * consumed.
+	 */
+	if (len != 60 || protocol != bpf_htons(0x86dd) || ifindex != 1)
+		return 0;
+	result.fexit_test_ok = true;
+	return 0;
+}