diff options
Diffstat (limited to '')
-rw-r--r-- | tools/testing/selftests/bpf/progs/socket_cookie_prog.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/socket_cookie_prog.c b/tools/testing/selftests/bpf/progs/socket_cookie_prog.c new file mode 100644 index 000000000..0cb5656a2 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/socket_cookie_prog.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2018 Facebook + +#include <linux/bpf.h> +#include <sys/socket.h> + +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_endian.h> + +struct socket_cookie { + __u64 cookie_key; + __u32 cookie_value; +}; + +struct { + __uint(type, BPF_MAP_TYPE_SK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, struct socket_cookie); +} socket_cookies SEC(".maps"); + +SEC("cgroup/connect6") +int set_cookie(struct bpf_sock_addr *ctx) +{ + struct socket_cookie *p; + + if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6) + return 1; + + p = bpf_sk_storage_get(&socket_cookies, ctx->sk, 0, + BPF_SK_STORAGE_GET_F_CREATE); + if (!p) + return 1; + + p->cookie_value = 0xFF; + p->cookie_key = bpf_get_socket_cookie(ctx); + + return 1; +} + +SEC("sockops") +int update_cookie(struct bpf_sock_ops *ctx) +{ + struct bpf_sock *sk; + struct socket_cookie *p; + + if (ctx->family != AF_INET6) + return 1; + + if (ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB) + return 1; + + if (!ctx->sk) + return 1; + + p = bpf_sk_storage_get(&socket_cookies, ctx->sk, 0, 0); + if (!p) + return 1; + + if (p->cookie_key != bpf_get_socket_cookie(ctx)) + return 1; + + p->cookie_value = (ctx->local_port << 8) | p->cookie_value; + + return 1; +} + +int _version SEC("version") = 1; + +char _license[] SEC("license") = "GPL"; |