// SPDX-License-Identifier: GPL-2.0 /* Copyright Amazon.com Inc. or its affiliates. */ #include <vmlinux.h> #include "bpf_tracing_net.h" #include <bpf/bpf_helpers.h> #include <limits.h> #define AUTOBIND_LEN 6 char sun_path[AUTOBIND_LEN]; #define NR_CASES 5 int sndbuf_setsockopt[NR_CASES] = {-1, 0, 8192, INT_MAX / 2, INT_MAX}; int sndbuf_getsockopt[NR_CASES] = {-1, -1, -1, -1, -1}; int sndbuf_getsockopt_expected[NR_CASES]; static inline int cmpname(struct unix_sock *unix_sk) { int i; for (i = 0; i < AUTOBIND_LEN; i++) { if (unix_sk->addr->name->sun_path[i] != sun_path[i]) return -1; } return 0; } SEC("iter/unix") int change_sndbuf(struct bpf_iter__unix *ctx) { struct unix_sock *unix_sk = ctx->unix_sk; int i, err; if (!unix_sk || !unix_sk->addr) return 0; if (unix_sk->addr->name->sun_path[0]) return 0; if (cmpname(unix_sk)) return 0; for (i = 0; i < NR_CASES; i++) { err = bpf_setsockopt(unix_sk, SOL_SOCKET, SO_SNDBUF, &sndbuf_setsockopt[i], sizeof(sndbuf_setsockopt[i])); if (err) break; err = bpf_getsockopt(unix_sk, SOL_SOCKET, SO_SNDBUF, &sndbuf_getsockopt[i], sizeof(sndbuf_getsockopt[i])); if (err) break; } return 0; } char _license[] SEC("license") = "GPL";