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bpf: Enable bpf_{g,s}etsockopt in BPF_CGROUP_UDP{4,6}_SENDMSG
Can be used to query/modify socket state for unconnected UDP sendmsg. Those hooks run as BPF_CGROUP_RUN_SA_PROG_LOCK and operate on a locked socket. Signed-off-by: Stanislav Fomichev <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,21 @@ | ||
/* SPDX-License-Identifier: GPL-2.0 */ | ||
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#include <sys/socket.h> | ||
#include <bpf/bpf_helpers.h> | ||
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int get_set_sk_priority(void *ctx) | ||
{ | ||
int prio; | ||
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/* Verify that context allows calling bpf_getsockopt and | ||
* bpf_setsockopt by reading and writing back socket | ||
* priority. | ||
*/ | ||
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if (bpf_getsockopt(ctx, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio))) | ||
return 0; | ||
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio))) | ||
return 0; | ||
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return 1; | ||
} |
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