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-rw-r--r--tools/testing/selftests/bpf/progs/bpf_iter_netlink.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_netlink.c b/tools/testing/selftests/bpf/progs/bpf_iter_netlink.c
new file mode 100644
index 000000000..95989f4c9
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_netlink.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include "bpf_iter.h"
+#include "bpf_tracing_net.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+static __attribute__((noinline)) struct inode *SOCK_INODE(struct socket *socket)
+{
+ return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
+}
+
+SEC("iter/netlink")
+int dump_netlink(struct bpf_iter__netlink *ctx)
+{
+ struct seq_file *seq = ctx->meta->seq;
+ struct netlink_sock *nlk = ctx->sk;
+ unsigned long group, ino;
+ struct inode *inode;
+ struct socket *sk;
+ struct sock *s;
+
+ if (nlk == (void *)0)
+ return 0;
+
+ if (ctx->meta->seq_num == 0)
+ BPF_SEQ_PRINTF(seq, "sk Eth Pid Groups "
+ "Rmem Wmem Dump Locks Drops "
+ "Inode\n");
+
+ s = &nlk->sk;
+ BPF_SEQ_PRINTF(seq, "%pK %-3d ", s, s->sk_protocol);
+
+ if (!nlk->groups) {
+ group = 0;
+ } else {
+ /* FIXME: temporary use bpf_probe_read_kernel here, needs
+ * verifier support to do direct access.
+ */
+ bpf_probe_read_kernel(&group, sizeof(group), &nlk->groups[0]);
+ }
+ BPF_SEQ_PRINTF(seq, "%-10u %08x %-8d %-8d %-5d %-8d ",
+ nlk->portid, (u32)group,
+ s->sk_rmem_alloc.counter,
+ s->sk_wmem_alloc.refs.counter - 1,
+ nlk->cb_running, s->sk_refcnt.refs.counter);
+
+ sk = s->sk_socket;
+ if (!sk) {
+ ino = 0;
+ } else {
+ /* FIXME: container_of inside SOCK_INODE has a forced
+ * type conversion, and direct access cannot be used
+ * with current verifier.
+ */
+ inode = SOCK_INODE(sk);
+ bpf_probe_read_kernel(&ino, sizeof(ino), &inode->i_ino);
+ }
+ BPF_SEQ_PRINTF(seq, "%-8u %-8lu\n", s->sk_drops.counter, ino);
+
+ return 0;
+}