e4d9c23207
A handful of samples and selftests fail to build on s390, because
after commit 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}()
only to archs where they work") bpf_probe_read is not available
anymore.
Fix by using bpf_probe_read_kernel.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200720114806.88823-1-iii@linux.ibm.com
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include "bpf_iter.h"
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#include "bpf_tracing_net.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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static __attribute__((noinline)) struct inode *SOCK_INODE(struct socket *socket)
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{
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return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
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}
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SEC("iter/netlink")
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int dump_netlink(struct bpf_iter__netlink *ctx)
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{
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struct seq_file *seq = ctx->meta->seq;
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struct netlink_sock *nlk = ctx->sk;
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unsigned long group, ino;
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struct inode *inode;
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struct socket *sk;
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struct sock *s;
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if (nlk == (void *)0)
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return 0;
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if (ctx->meta->seq_num == 0)
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BPF_SEQ_PRINTF(seq, "sk Eth Pid Groups "
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"Rmem Wmem Dump Locks Drops "
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"Inode\n");
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s = &nlk->sk;
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BPF_SEQ_PRINTF(seq, "%pK %-3d ", s, s->sk_protocol);
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if (!nlk->groups) {
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group = 0;
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} else {
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/* FIXME: temporary use bpf_probe_read_kernel here, needs
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* verifier support to do direct access.
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*/
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bpf_probe_read_kernel(&group, sizeof(group), &nlk->groups[0]);
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}
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BPF_SEQ_PRINTF(seq, "%-10u %08x %-8d %-8d %-5d %-8d ",
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nlk->portid, (u32)group,
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s->sk_rmem_alloc.counter,
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s->sk_wmem_alloc.refs.counter - 1,
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nlk->cb_running, s->sk_refcnt.refs.counter);
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sk = s->sk_socket;
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if (!sk) {
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ino = 0;
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} else {
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/* FIXME: container_of inside SOCK_INODE has a forced
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* type conversion, and direct access cannot be used
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* with current verifier.
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*/
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inode = SOCK_INODE(sk);
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bpf_probe_read_kernel(&ino, sizeof(ino), &inode->i_ino);
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}
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BPF_SEQ_PRINTF(seq, "%-8u %-8lu\n", s->sk_drops.counter, ino);
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return 0;
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}
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