1 #include "../../include/bpf_api.h"
2
3 /* Cyclic dependency example to test the kernel's runtime upper
4 * bound on loops. Also demonstrates on how to use direct-actions,
5 * loaded as: tc filter add [...] bpf da obj [...]
6 */
7 #define JMP_MAP_ID 0xabccba
8
9 BPF_PROG_ARRAY(jmp_tc, JMP_MAP_ID, PIN_OBJECT_NS, 1);
10
11 __section_tail(JMP_MAP_ID, 0)
cls_loop(struct __sk_buff * skb)12 int cls_loop(struct __sk_buff *skb)
13 {
14 char fmt[] = "cb: %u\n";
15
16 trace_printk(fmt, sizeof(fmt), skb->cb[0]++);
17 tail_call(skb, &jmp_tc, 0);
18
19 skb->tc_classid = TC_H_MAKE(1, 42);
20 return TC_ACT_OK;
21 }
22
23 __section_cls_entry
cls_entry(struct __sk_buff * skb)24 int cls_entry(struct __sk_buff *skb)
25 {
26 tail_call(skb, &jmp_tc, 0);
27 return TC_ACT_SHOT;
28 }
29
30 BPF_LICENSE("GPL");
31