diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/fexit_bpf2bpf.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/fexit_bpf2bpf.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/fexit_bpf2bpf.c b/tools/testing/selftests/bpf/progs/fexit_bpf2bpf.c index 98e1efe14549..49a84a3a2306 100644 --- a/tools/testing/selftests/bpf/progs/fexit_bpf2bpf.c +++ b/tools/testing/selftests/bpf/progs/fexit_bpf2bpf.c @@ -1,8 +1,10 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2019 Facebook */ #include <linux/stddef.h> +#include <linux/if_ether.h> #include <linux/ipv6.h> #include <linux/bpf.h> +#include <linux/tcp.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_endian.h> #include <bpf/bpf_tracing.h> @@ -151,4 +153,29 @@ int new_get_constant(long val) test_get_constant = 1; return test_get_constant; /* original get_constant() returns val - 122 */ } + +__u64 test_pkt_write_access_subprog = 0; +SEC("freplace/test_pkt_write_access_subprog") +int new_test_pkt_write_access_subprog(struct __sk_buff *skb, __u32 off) +{ + + void *data = (void *)(long)skb->data; + void *data_end = (void *)(long)skb->data_end; + struct tcphdr *tcp; + + if (off > sizeof(struct ethhdr) + sizeof(struct ipv6hdr)) + return -1; + + tcp = data + off; + if (tcp + 1 > data_end) + return -1; + + /* make modifications to the packet data */ + tcp->check++; + tcp->syn = 0; + + test_pkt_write_access_subprog = 1; + return 0; +} + char _license[] SEC("license") = "GPL"; |