Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
44 lines
943 B
C
44 lines
943 B
C
// SPDX-License-Identifier: GPL-2.0
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#include "bpf_tracing_net.h"
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char _license[] SEC("license") = "GPL";
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int sk_index;
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int redirect_idx;
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int trace_port;
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int helper_ret;
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(key_size, sizeof(__u32));
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__uint(value_size, sizeof(__u32));
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__uint(max_entries, 100);
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} sock_map SEC(".maps");
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SEC("sockops")
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int mptcp_sockmap_inject(struct bpf_sock_ops *skops)
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{
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struct bpf_sock *sk;
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/* only accept specified connection */
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if (skops->local_port != trace_port ||
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skops->op != BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB)
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return 1;
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sk = skops->sk;
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if (!sk)
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return 1;
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/* update sk handler */
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helper_ret = bpf_sock_map_update(skops, &sock_map, &sk_index, BPF_NOEXIST);
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return 1;
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}
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SEC("sk_skb/stream_verdict")
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int mptcp_sockmap_redirect(struct __sk_buff *skb)
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{
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/* redirect skb to the sk under sock_map[redirect_idx] */
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return bpf_sk_redirect_map(skb, &sock_map, redirect_idx, 0);
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}
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