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View File Name :
bpf_cyclic.c
#include "../../../include/bpf_api.h" /* Cyclic dependency example to test the kernel's runtime upper * bound on loops. Also demonstrates on how to use direct-actions, * loaded as: tc filter add [...] bpf da obj [...] */ #define JMP_MAP_ID 0xabccba struct bpf_elf_map __section_maps jmp_tc = { .type = BPF_MAP_TYPE_PROG_ARRAY, .id = JMP_MAP_ID, .size_key = sizeof(uint32_t), .size_value = sizeof(uint32_t), .pinning = PIN_OBJECT_NS, .max_elem = 1, }; __section_tail(JMP_MAP_ID, 0) int cls_loop(struct __sk_buff *skb) { printt("cb: %u\n", skb->cb[0]++); tail_call(skb, &jmp_tc, 0); skb->tc_classid = TC_H_MAKE(1, 42); return TC_ACT_OK; } __section_cls_entry int cls_entry(struct __sk_buff *skb) { tail_call(skb, &jmp_tc, 0); return TC_ACT_SHOT; } BPF_LICENSE("GPL");