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4dd3f50af4
Follow-up to kernel commit 6c9059817432 ("bpf: pre-allocate hash map
elements"). Add flags support, so that we can pass in BPF_F_NO_PREALLOC
flag for disallowing preallocation. Update examples accordingly and also
remove the BPF_* map helper macros from them as they were not very useful.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
36 lines
786 B
C
36 lines
786 B
C
#include "../../include/bpf_api.h"
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/* Cyclic dependency example to test the kernel's runtime upper
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* bound on loops. Also demonstrates on how to use direct-actions,
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* loaded as: tc filter add [...] bpf da obj [...]
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*/
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#define JMP_MAP_ID 0xabccba
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struct bpf_elf_map __section_maps jmp_tc = {
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.type = BPF_MAP_TYPE_PROG_ARRAY,
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.id = JMP_MAP_ID,
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.size_key = sizeof(uint32_t),
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.size_value = sizeof(uint32_t),
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.pinning = PIN_OBJECT_NS,
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.max_elem = 1,
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};
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__section_tail(JMP_MAP_ID, 0)
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int cls_loop(struct __sk_buff *skb)
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{
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printt("cb: %u\n", skb->cb[0]++);
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tail_call(skb, &jmp_tc, 0);
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skb->tc_classid = TC_H_MAKE(1, 42);
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return TC_ACT_OK;
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}
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__section_cls_entry
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int cls_entry(struct __sk_buff *skb)
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{
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tail_call(skb, &jmp_tc, 0);
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return TC_ACT_SHOT;
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}
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BPF_LICENSE("GPL");
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