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Linux/tools/testing/selftests/bpf/progs/bpf_iter_setsockopt_unix.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright Amazon.com Inc. or its affiliates. */
  3 #include "bpf_iter.h"
  4 #include "bpf_tracing_net.h"
  5 #include <bpf/bpf_helpers.h>
  6 #include <limits.h>
  7 
  8 #define AUTOBIND_LEN 6
  9 char sun_path[AUTOBIND_LEN];
 10 
 11 #define NR_CASES 5
 12 int sndbuf_setsockopt[NR_CASES] = {-1, 0, 8192, INT_MAX / 2, INT_MAX};
 13 int sndbuf_getsockopt[NR_CASES] = {-1, -1, -1, -1, -1};
 14 int sndbuf_getsockopt_expected[NR_CASES];
 15 
 16 static inline int cmpname(struct unix_sock *unix_sk)
 17 {
 18         int i;
 19 
 20         for (i = 0; i < AUTOBIND_LEN; i++) {
 21                 if (unix_sk->addr->name->sun_path[i] != sun_path[i])
 22                         return -1;
 23         }
 24 
 25         return 0;
 26 }
 27 
 28 SEC("iter/unix")
 29 int change_sndbuf(struct bpf_iter__unix *ctx)
 30 {
 31         struct unix_sock *unix_sk = ctx->unix_sk;
 32         int i, err;
 33 
 34         if (!unix_sk || !unix_sk->addr)
 35                 return 0;
 36 
 37         if (unix_sk->addr->name->sun_path[0])
 38                 return 0;
 39 
 40         if (cmpname(unix_sk))
 41                 return 0;
 42 
 43         for (i = 0; i < NR_CASES; i++) {
 44                 err = bpf_setsockopt(unix_sk, SOL_SOCKET, SO_SNDBUF,
 45                                      &sndbuf_setsockopt[i],
 46                                      sizeof(sndbuf_setsockopt[i]));
 47                 if (err)
 48                         break;
 49 
 50                 err = bpf_getsockopt(unix_sk, SOL_SOCKET, SO_SNDBUF,
 51                                      &sndbuf_getsockopt[i],
 52                                      sizeof(sndbuf_getsockopt[i]));
 53                 if (err)
 54                         break;
 55         }
 56 
 57         return 0;
 58 }
 59 
 60 char _license[] SEC("license") = "GPL";
 61 

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