diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_pkt_access.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_pkt_access.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_pkt_access.c b/tools/testing/selftests/bpf/progs/test_pkt_access.c index e72eba4a93d2..bce7173152c6 100644 --- a/tools/testing/selftests/bpf/progs/test_pkt_access.c +++ b/tools/testing/selftests/bpf/progs/test_pkt_access.c @@ -13,9 +13,7 @@ #include <linux/pkt_cls.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_endian.h> - -#define barrier() __asm__ __volatile__("": : :"memory") -int _version SEC("version") = 1; +#include "bpf_misc.h" /* llvm will optimize both subprograms into exactly the same BPF assembly * @@ -54,6 +52,8 @@ int get_skb_len(struct __sk_buff *skb) { volatile char buf[MAX_STACK] = {}; + __sink(buf[MAX_STACK - 1]); + return skb->len; } @@ -76,10 +76,30 @@ int get_skb_ifindex(int val, struct __sk_buff *skb, int var) { volatile char buf[MAX_STACK] = {}; + __sink(buf[MAX_STACK - 1]); + return skb->ifindex * val * var; } -SEC("classifier/test_pkt_access") +__attribute__ ((noinline)) +int 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 = NULL; + + if (off > sizeof(struct ethhdr) + sizeof(struct ipv6hdr)) + return -1; + + tcp = data + off; + if (tcp + 1 > data_end) + return -1; + /* make modification to the packet data */ + tcp->check++; + return 0; +} + +SEC("tc") int test_pkt_access(struct __sk_buff *skb) { void *data_end = (void *)(long)skb->data_end; @@ -117,6 +137,8 @@ int test_pkt_access(struct __sk_buff *skb) if (test_pkt_access_subprog3(3, skb) != skb->len * 3 * skb->ifindex) return TC_ACT_SHOT; if (tcp) { + if (test_pkt_write_access_subprog(skb, (void *)tcp - data)) + return TC_ACT_SHOT; if (((void *)(tcp) + 20) > data_end || proto != 6) return TC_ACT_SHOT; barrier(); /* to force ordering of checks */ |