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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#define __always_unused __attribute__((unused))
char _license[] SEC("license") = "GPL";
struct sock {
} __attribute__((preserve_access_index));
struct bpf_iter__sockmap {
union {
struct sock *sk;
};
} __attribute__((preserve_access_index));
struct {
__uint(type, BPF_MAP_TYPE_SOCKHASH);
__uint(max_entries, 1);
__type(key, int);
__type(value, int);
} sockhash SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_SOCKMAP);
__uint(max_entries, 1);
__type(key, int);
__type(value, int);
} sockmap SEC(".maps");
enum { CG_OK = 1 };
int zero = 0;
static __always_inline void test_sockmap_delete(void)
{
bpf_map_delete_elem(&sockmap, &zero);
bpf_map_delete_elem(&sockhash, &zero);
}
static __always_inline void test_sockmap_update(void *sk)
{
if (sk) {
bpf_map_update_elem(&sockmap, &zero, sk, BPF_ANY);
bpf_map_update_elem(&sockhash, &zero, sk, BPF_ANY);
}
}
static __always_inline void test_sockmap_lookup_and_update(void)
{
struct bpf_sock *sk = bpf_map_lookup_elem(&sockmap, &zero);
if (sk) {
test_sockmap_update(sk);
bpf_sk_release(sk);
}
}
static __always_inline void test_sockmap_mutate(void *sk)
{
test_sockmap_delete();
test_sockmap_update(sk);
}
static __always_inline void test_sockmap_lookup_and_mutate(void)
{
test_sockmap_delete();
test_sockmap_lookup_and_update();
}
SEC("action")
__success
int test_sched_act(struct __sk_buff *skb)
{
test_sockmap_mutate(skb->sk);
return 0;
}
SEC("classifier")
__success
int test_sched_cls(struct __sk_buff *skb)
{
test_sockmap_mutate(skb->sk);
return 0;
}
SEC("flow_dissector")
__success
int test_flow_dissector_delete(struct __sk_buff *skb __always_unused)
{
test_sockmap_delete();
return 0;
}
SEC("flow_dissector")
__failure __msg("program of this type cannot use helper bpf_sk_release")
int test_flow_dissector_update(struct __sk_buff *skb __always_unused)
{
test_sockmap_lookup_and_update(); /* no access to skb->sk */
return 0;
}
SEC("iter/sockmap")
__success
int test_trace_iter(struct bpf_iter__sockmap *ctx)
{
test_sockmap_mutate(ctx->sk);
return 0;
}
SEC("raw_tp/kfree")
__failure __msg("cannot update sockmap in this context")
int test_raw_tp_delete(const void *ctx __always_unused)
{
test_sockmap_delete();
return 0;
}
SEC("raw_tp/kfree")
__failure __msg("cannot update sockmap in this context")
int test_raw_tp_update(const void *ctx __always_unused)
{
test_sockmap_lookup_and_update();
return 0;
}
SEC("sk_lookup")
__success
int test_sk_lookup(struct bpf_sk_lookup *ctx)
{
test_sockmap_mutate(ctx->sk);
return 0;
}
SEC("sk_reuseport")
__success
int test_sk_reuseport(struct sk_reuseport_md *ctx)
{
test_sockmap_mutate(ctx->sk);
return 0;
}
SEC("socket")
__success
int test_socket_filter(struct __sk_buff *skb)
{
test_sockmap_mutate(skb->sk);
return 0;
}
SEC("sockops")
__success
int test_sockops_delete(struct bpf_sock_ops *ctx __always_unused)
{
test_sockmap_delete();
return CG_OK;
}
SEC("sockops")
__failure __msg("cannot update sockmap in this context")
int test_sockops_update(struct bpf_sock_ops *ctx)
{
test_sockmap_update(ctx->sk);
return CG_OK;
}
SEC("sockops")
__success
int test_sockops_update_dedicated(struct bpf_sock_ops *ctx)
{
bpf_sock_map_update(ctx, &sockmap, &zero, BPF_ANY);
bpf_sock_hash_update(ctx, &sockhash, &zero, BPF_ANY);
return CG_OK;
}
SEC("xdp")
__success
int test_xdp(struct xdp_md *ctx __always_unused)
{
test_sockmap_lookup_and_mutate();
return XDP_PASS;
}
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