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View File Name :
bpf_graft.c
#include "../../../include/bpf_api.h" /* This example demonstrates how classifier run-time behaviour * can be altered with tail calls. We start out with an empty * jmp_tc array, then add section aaa to the array slot 0, and * later on atomically replace it with section bbb. Note that * as shown in other examples, the tc loader can prepopulate * tail called sections, here we start out with an empty one * on purpose to show it can also be done this way. * * tc filter add dev foo parent ffff: bpf obj graft.o * tc exec bpf dbg * [...] * Socket Thread-20229 [001] ..s. 138993.003923: : fallthrough * <idle>-0 [001] ..s. 138993.202265: : fallthrough * Socket Thread-20229 [001] ..s. 138994.004149: : fallthrough * [...] * * tc exec bpf graft m:globals/jmp_tc key 0 obj graft.o sec aaa * tc exec bpf dbg * [...] * Socket Thread-19818 [002] ..s. 139012.053587: : aaa * <idle>-0 [002] ..s. 139012.172359: : aaa * Socket Thread-19818 [001] ..s. 139012.173556: : aaa * [...] * * tc exec bpf graft m:globals/jmp_tc key 0 obj graft.o sec bbb * tc exec bpf dbg * [...] * Socket Thread-19818 [002] ..s. 139022.102967: : bbb * <idle>-0 [002] ..s. 139022.155640: : bbb * Socket Thread-19818 [001] ..s. 139022.156730: : bbb * [...] */ struct bpf_elf_map __section_maps jmp_tc = { .type = BPF_MAP_TYPE_PROG_ARRAY, .size_key = sizeof(uint32_t), .size_value = sizeof(uint32_t), .pinning = PIN_GLOBAL_NS, .max_elem = 1, }; __section("aaa") int cls_aaa(struct __sk_buff *skb) { printt("aaa\n"); return TC_H_MAKE(1, 42); } __section("bbb") int cls_bbb(struct __sk_buff *skb) { printt("bbb\n"); return TC_H_MAKE(1, 43); } __section_cls_entry int cls_entry(struct __sk_buff *skb) { tail_call(skb, &jmp_tc, 0); printt("fallthrough\n"); return BPF_H_DEFAULT; } BPF_LICENSE("GPL");