diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_sock_fields.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_sock_fields.c | 68 |
1 files changed, 61 insertions, 7 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_sock_fields.c b/tools/testing/selftests/bpf/progs/test_sock_fields.c index 81b57b9aaaea..f75e531bf36f 100644 --- a/tools/testing/selftests/bpf/progs/test_sock_fields.c +++ b/tools/testing/selftests/bpf/progs/test_sock_fields.c @@ -12,6 +12,7 @@ enum bpf_linum_array_idx { EGRESS_LINUM_IDX, INGRESS_LINUM_IDX, + READ_SK_DST_PORT_LINUM_IDX, __NR_BPF_LINUM_ARRAY_IDX, }; @@ -113,14 +114,14 @@ static void tpcpy(struct bpf_tcp_sock *dst, #define RET_LOG() ({ \ linum = __LINE__; \ - bpf_map_update_elem(&linum_map, &linum_idx, &linum, BPF_NOEXIST); \ + bpf_map_update_elem(&linum_map, &linum_idx, &linum, BPF_ANY); \ return CG_OK; \ }) SEC("cgroup_skb/egress") int egress_read_sock_fields(struct __sk_buff *skb) { - struct bpf_spinlock_cnt cli_cnt_init = { .lock = 0, .cnt = 0xeB9F }; + struct bpf_spinlock_cnt cli_cnt_init = { .lock = {}, .cnt = 0xeB9F }; struct bpf_spinlock_cnt *pkt_out_cnt, *pkt_out_cnt10; struct bpf_tcp_sock *tp, *tp_ret; struct bpf_sock *sk, *sk_ret; @@ -133,11 +134,11 @@ int egress_read_sock_fields(struct __sk_buff *skb) if (!sk) RET_LOG(); - /* Not the testing egress traffic or - * TCP_LISTEN (10) socket will be copied at the ingress side. + /* Not testing the egress traffic or the listening socket, + * which are covered by the cgroup_skb/ingress test program. */ if (sk->family != AF_INET6 || !is_loopback6(sk->src_ip6) || - sk->state == 10) + sk->state == BPF_TCP_LISTEN) return CG_OK; if (sk->src_port == bpf_ntohs(srv_sa6.sin6_port)) { @@ -231,8 +232,8 @@ int ingress_read_sock_fields(struct __sk_buff *skb) sk->src_port != bpf_ntohs(srv_sa6.sin6_port)) return CG_OK; - /* Only interested in TCP_LISTEN */ - if (sk->state != 10) + /* Only interested in the listening socket */ + if (sk->state != BPF_TCP_LISTEN) return CG_OK; /* It must be a fullsock for cgroup_skb/ingress prog */ @@ -250,4 +251,57 @@ int ingress_read_sock_fields(struct __sk_buff *skb) return CG_OK; } +/* + * NOTE: 4-byte load from bpf_sock at dst_port offset is quirky. It + * gets rewritten by the access converter to a 2-byte load for + * backward compatibility. Treating the load result as a be16 value + * makes the code portable across little- and big-endian platforms. + */ +static __noinline bool sk_dst_port__load_word(struct bpf_sock *sk) +{ + __u32 *word = (__u32 *)&sk->dst_port; + return word[0] == bpf_htons(0xcafe); +} + +static __noinline bool sk_dst_port__load_half(struct bpf_sock *sk) +{ + __u16 *half; + + asm volatile (""); + half = (__u16 *)&sk->dst_port; + return half[0] == bpf_htons(0xcafe); +} + +static __noinline bool sk_dst_port__load_byte(struct bpf_sock *sk) +{ + __u8 *byte = (__u8 *)&sk->dst_port; + return byte[0] == 0xca && byte[1] == 0xfe; +} + +SEC("cgroup_skb/egress") +int read_sk_dst_port(struct __sk_buff *skb) +{ + __u32 linum, linum_idx; + struct bpf_sock *sk; + + linum_idx = READ_SK_DST_PORT_LINUM_IDX; + + sk = skb->sk; + if (!sk) + RET_LOG(); + + /* Ignore everything but the SYN from the client socket */ + if (sk->state != BPF_TCP_SYN_SENT) + return CG_OK; + + if (!sk_dst_port__load_word(sk)) + RET_LOG(); + if (!sk_dst_port__load_half(sk)) + RET_LOG(); + if (!sk_dst_port__load_byte(sk)) + RET_LOG(); + + return CG_OK; +} + char _license[] SEC("license") = "GPL"; |