Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
bpf: Add getter and setter for SO_REUSEPORT through bpf_{g,s}etsockopt
Augment the current set of options that are accessible via
bpf_{g,s}etsockopt to also support SO_REUSEPORT.
Signed-off-by: Manu Bretelle <chantra@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210310182305.1910312-1-chantra@fb.com
authored by
Manu Bretelle
and committed by
Daniel Borkmann
6503b9f2
1211f4e9
+56
+6
net/core/filter.c
+6
net/core/filter.c
···
4729
4729
sk->sk_prot->keepalive(sk, valbool);
4730
4730
sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
4731
4731
break;
4732
+
case SO_REUSEPORT:
4733
+
sk->sk_reuseport = valbool;
4734
+
break;
4732
4735
default:
4733
4736
ret = -EINVAL;
4734
4737
}
···
4900
4897
break;
4901
4898
case SO_BINDTOIFINDEX:
4902
4899
*((int *)optval) = sk->sk_bound_dev_if;
4900
+
break;
4901
+
case SO_REUSEPORT:
4902
+
*((int *)optval) = sk->sk_reuseport;
4903
4903
break;
4904
4904
default:
4905
4905
goto err_clear;
+25
tools/testing/selftests/bpf/progs/bind4_prog.c
+25
tools/testing/selftests/bpf/progs/bind4_prog.c
···
57
57
return 0;
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58
}
59
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60
+
static __inline int bind_reuseport(struct bpf_sock_addr *ctx)
61
+
{
62
+
int val = 1;
63
+
64
+
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
65
+
&val, sizeof(val)))
66
+
return 1;
67
+
if (bpf_getsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
68
+
&val, sizeof(val)) || !val)
69
+
return 1;
70
+
val = 0;
71
+
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
72
+
&val, sizeof(val)))
73
+
return 1;
74
+
if (bpf_getsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
75
+
&val, sizeof(val)) || val)
76
+
return 1;
77
+
78
+
return 0;
79
+
}
80
+
60
81
static __inline int misc_opts(struct bpf_sock_addr *ctx, int opt)
61
82
{
62
83
int old, tmp, new = 0xeb9f;
···
146
125
147
126
/* Test for misc socket options. */
148
127
if (misc_opts(ctx, SO_MARK) || misc_opts(ctx, SO_PRIORITY))
128
+
return 0;
129
+
130
+
/* Set reuseport and unset */
131
+
if (bind_reuseport(ctx))
149
132
return 0;
150
133
151
134
ctx->user_ip4 = bpf_htonl(SERV4_REWRITE_IP);
+25
tools/testing/selftests/bpf/progs/bind6_prog.c
+25
tools/testing/selftests/bpf/progs/bind6_prog.c
···
63
63
return 0;
64
64
}
65
65
66
+
static __inline int bind_reuseport(struct bpf_sock_addr *ctx)
67
+
{
68
+
int val = 1;
69
+
70
+
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
71
+
&val, sizeof(val)))
72
+
return 1;
73
+
if (bpf_getsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
74
+
&val, sizeof(val)) || !val)
75
+
return 1;
76
+
val = 0;
77
+
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
78
+
&val, sizeof(val)))
79
+
return 1;
80
+
if (bpf_getsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
81
+
&val, sizeof(val)) || val)
82
+
return 1;
83
+
84
+
return 0;
85
+
}
86
+
66
87
static __inline int misc_opts(struct bpf_sock_addr *ctx, int opt)
67
88
{
68
89
int old, tmp, new = 0xeb9f;
···
160
139
161
140
/* Test for misc socket options. */
162
141
if (misc_opts(ctx, SO_MARK) || misc_opts(ctx, SO_PRIORITY))
142
+
return 0;
143
+
144
+
/* Set reuseport and unset */
145
+
if (bind_reuseport(ctx))
163
146
return 0;
164
147
165
148
ctx->user_ip6[0] = bpf_htonl(SERV6_REWRITE_IP_0);