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Diffstat (limited to 'samples/bpf/test_cgrp2_tc.bpf.c')
-rw-r--r--samples/bpf/test_cgrp2_tc.bpf.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/samples/bpf/test_cgrp2_tc.bpf.c b/samples/bpf/test_cgrp2_tc.bpf.c
new file mode 100644
index 0000000000..c7d2291d67
--- /dev/null
+++ b/samples/bpf/test_cgrp2_tc.bpf.c
@@ -0,0 +1,56 @@
+/* Copyright (c) 2016 Facebook
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#define KBUILD_MODNAME "foo"
+#include "vmlinux.h"
+#include "net_shared.h"
+#include <bpf/bpf_helpers.h>
+
+/* copy of 'struct ethhdr' without __packed */
+struct eth_hdr {
+ unsigned char h_dest[ETH_ALEN];
+ unsigned char h_source[ETH_ALEN];
+ unsigned short h_proto;
+};
+
+struct {
+ __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY);
+ __type(key, u32);
+ __type(value, u32);
+ __uint(pinning, LIBBPF_PIN_BY_NAME);
+ __uint(max_entries, 1);
+} test_cgrp2_array_pin SEC(".maps");
+
+SEC("filter")
+int handle_egress(struct __sk_buff *skb)
+{
+ void *data = (void *)(long)skb->data;
+ struct eth_hdr *eth = data;
+ struct ipv6hdr *ip6h = data + sizeof(*eth);
+ void *data_end = (void *)(long)skb->data_end;
+ char dont_care_msg[] = "dont care %04x %d\n";
+ char pass_msg[] = "pass\n";
+ char reject_msg[] = "reject\n";
+
+ /* single length check */
+ if (data + sizeof(*eth) + sizeof(*ip6h) > data_end)
+ return TC_ACT_OK;
+
+ if (eth->h_proto != bpf_htons(ETH_P_IPV6) ||
+ ip6h->nexthdr != IPPROTO_ICMPV6) {
+ bpf_trace_printk(dont_care_msg, sizeof(dont_care_msg),
+ eth->h_proto, ip6h->nexthdr);
+ return TC_ACT_OK;
+ } else if (bpf_skb_under_cgroup(skb, &test_cgrp2_array_pin, 0) != 1) {
+ bpf_trace_printk(pass_msg, sizeof(pass_msg));
+ return TC_ACT_OK;
+ } else {
+ bpf_trace_printk(reject_msg, sizeof(reject_msg));
+ return TC_ACT_SHOT;
+ }
+}
+
+char _license[] SEC("license") = "GPL";