@@ -211,6 +211,11 @@ static int (*bpf_strtol)(const char *buf, unsigned long long buf_len,
static int (*bpf_strtoul)(const char *buf, unsigned long long buf_len,
unsigned long long flags, unsigned long *res) =
(void *) BPF_FUNC_strtoul;
+static void *(*bpf_sk_storage_get)(void *map, struct bpf_sock *sk,
+ void *value, __u64 flags) =
+ (void *) BPF_FUNC_sk_storage_get;
+static int (*bpf_sk_storage_delete)(void *map, struct bpf_sock *sk) =
+ (void *)BPF_FUNC_sk_storage_delete;
/* llvm builtin functions that eBPF C program may use to
* emit BPF_LD_ABS and BPF_LD_IND instructions
@@ -55,6 +55,31 @@ struct bpf_map_def SEC("maps") linum_map = {
.max_entries = __NR_BPF_LINUM_ARRAY_IDX,
};
+struct bpf_spinlock_cnt {
+ struct bpf_spin_lock lock;
+ __u32 cnt;
+};
+
+struct bpf_map_def SEC("maps") sk_pkt_out_cnt = {
+ .type = BPF_MAP_TYPE_SK_STORAGE,
+ .key_size = sizeof(int),
+ .value_size = sizeof(struct bpf_spinlock_cnt),
+ .max_entries = 0,
+ .map_flags = BPF_F_NO_PREALLOC,
+};
+
+BPF_ANNOTATE_KV_PAIR(sk_pkt_out_cnt, int, struct bpf_spinlock_cnt);
+
+struct bpf_map_def SEC("maps") sk_pkt_out_cnt10 = {
+ .type = BPF_MAP_TYPE_SK_STORAGE,
+ .key_size = sizeof(int),
+ .value_size = sizeof(struct bpf_spinlock_cnt),
+ .max_entries = 0,
+ .map_flags = BPF_F_NO_PREALLOC,
+};
+
+BPF_ANNOTATE_KV_PAIR(sk_pkt_out_cnt10, int, struct bpf_spinlock_cnt);
+
static bool is_loopback6(__u32 *a6)
{
return !a6[0] && !a6[1] && !a6[2] && a6[3] == bpf_htonl(1);
@@ -120,7 +145,9 @@ static void tpcpy(struct bpf_tcp_sock *dst,
SEC("cgroup_skb/egress")
int egress_read_sock_fields(struct __sk_buff *skb)
{
+ struct bpf_spinlock_cnt cli_cnt_init = { .lock = 0, .cnt = 0xeB9F };
__u32 srv_idx = ADDR_SRV_IDX, cli_idx = ADDR_CLI_IDX, result_idx;
+ struct bpf_spinlock_cnt *pkt_out_cnt, *pkt_out_cnt10;
struct sockaddr_in6 *srv_sa6, *cli_sa6;
struct bpf_tcp_sock *tp, *tp_ret;
struct bpf_sock *sk, *sk_ret;
@@ -161,6 +188,28 @@ int egress_read_sock_fields(struct __sk_buff *skb)
skcpy(sk_ret, sk);
tpcpy(tp_ret, tp);
+ if (result_idx == EGRESS_SRV_IDX) {
+ /* The userspace has created it for srv sk */
+ pkt_out_cnt = bpf_sk_storage_get(&sk_pkt_out_cnt, sk, 0, 0);
+ pkt_out_cnt10 = bpf_sk_storage_get(&sk_pkt_out_cnt10, sk,
+ 0, 0);
+ } else {
+ pkt_out_cnt = bpf_sk_storage_get(&sk_pkt_out_cnt, sk,
+ &cli_cnt_init,
+ BPF_SK_STORAGE_GET_F_CREATE);
+ pkt_out_cnt10 = bpf_sk_storage_get(&sk_pkt_out_cnt10,
+ sk, &cli_cnt_init,
+ BPF_SK_STORAGE_GET_F_CREATE);
+ }
+
+ if (!pkt_out_cnt || !pkt_out_cnt10)
+ RETURN;
+
+ pkt_out_cnt->cnt += 1;
+ bpf_spin_lock(&pkt_out_cnt10->lock);
+ pkt_out_cnt10->cnt += 10;
+ bpf_spin_unlock(&pkt_out_cnt10->lock);
+
RETURN;
}
@@ -35,6 +35,11 @@ enum bpf_linum_array_idx {
__NR_BPF_LINUM_ARRAY_IDX,
};
+struct bpf_spinlock_cnt {
+ struct bpf_spin_lock lock;
+ __u32 cnt;
+};
+
#define CHECK(condition, tag, format...) ({ \
int __ret = !!(condition); \
if (__ret) { \
@@ -50,6 +55,8 @@ enum bpf_linum_array_idx {
#define DATA_LEN sizeof(DATA)
static struct sockaddr_in6 srv_sa6, cli_sa6;
+static int sk_pkt_out_cnt10_fd;
+static int sk_pkt_out_cnt_fd;
static int linum_map_fd;
static int addr_map_fd;
static int tp_map_fd;
@@ -220,28 +227,90 @@ static void check_result(void)
"Unexpected listen_tp", "Check listen_tp output. ingress_linum:%u",
ingress_linum);
- CHECK(srv_tp.data_segs_out != 1 ||
+ CHECK(srv_tp.data_segs_out != 2 ||
srv_tp.data_segs_in ||
srv_tp.snd_cwnd != 10 ||
srv_tp.total_retrans ||
- srv_tp.bytes_acked != DATA_LEN,
+ srv_tp.bytes_acked != 2 * DATA_LEN,
"Unexpected srv_tp", "Check srv_tp output. egress_linum:%u",
egress_linum);
CHECK(cli_tp.data_segs_out ||
- cli_tp.data_segs_in != 1 ||
+ cli_tp.data_segs_in != 2 ||
cli_tp.snd_cwnd != 10 ||
cli_tp.total_retrans ||
- cli_tp.bytes_received != DATA_LEN,
+ cli_tp.bytes_received != 2 * DATA_LEN,
"Unexpected cli_tp", "Check cli_tp output. egress_linum:%u",
egress_linum);
}
+static void check_sk_pkt_out_cnt(int accept_fd, int cli_fd)
+{
+ struct bpf_spinlock_cnt pkt_out_cnt = {} , pkt_out_cnt10 = {};
+ int err;
+
+ pkt_out_cnt.cnt = ~0;
+ pkt_out_cnt10.cnt = ~0;
+ err = bpf_map_lookup_elem(sk_pkt_out_cnt_fd, &accept_fd, &pkt_out_cnt);
+ if (!err)
+ err = bpf_map_lookup_elem(sk_pkt_out_cnt10_fd, &accept_fd,
+ &pkt_out_cnt10);
+
+ /* The bpf prog only counts for fullsock and
+ * passive conneciton did not become fullsock until 3WHS
+ * had been finished.
+ * The bpf prog only counted two data packet out but we
+ * specially init accept_fd's pkt_out_cnt by 2 in
+ * init_sk_storage(). Hence, 4 here.
+ */
+ CHECK(err || pkt_out_cnt.cnt != 4 || pkt_out_cnt10.cnt != 40,
+ "bpf_map_lookup_elem(sk_pkt_out_cnt, &accept_fd)",
+ "err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u",
+ err, errno, pkt_out_cnt.cnt, pkt_out_cnt10.cnt);
+
+ pkt_out_cnt.cnt = ~0;
+ pkt_out_cnt10.cnt = ~0;
+ err = bpf_map_lookup_elem(sk_pkt_out_cnt_fd, &cli_fd, &pkt_out_cnt);
+ if (!err)
+ err = bpf_map_lookup_elem(sk_pkt_out_cnt10_fd, &cli_fd,
+ &pkt_out_cnt10);
+ /* Active connection is fullsock from the beginning.
+ * 1 SYN and 1 ACK during 3WHS
+ * 2 Acks on data packet.
+ *
+ * The bpf_prog initialized it to 0xeB9F.
+ */
+ CHECK(err || pkt_out_cnt.cnt != 0xeB9F + 4 ||
+ pkt_out_cnt10.cnt != 0xeB9F + 40,
+ "bpf_map_lookup_elem(sk_pkt_out_cnt, &cli_fd)",
+ "err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u",
+ err, errno, pkt_out_cnt.cnt, pkt_out_cnt10.cnt);
+}
+
+static void init_sk_storage(int sk_fd, __u32 pkt_out_cnt)
+{
+ struct bpf_spinlock_cnt scnt = {};
+ int err;
+
+ scnt.cnt = pkt_out_cnt;
+ err = bpf_map_update_elem(sk_pkt_out_cnt_fd, &sk_fd, &scnt,
+ BPF_NOEXIST);
+ CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt_fd)",
+ "err:%d errno:%d", err, errno);
+
+ scnt.cnt *= 10;
+ err = bpf_map_update_elem(sk_pkt_out_cnt10_fd, &sk_fd, &scnt,
+ BPF_NOEXIST);
+ CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt10_fd)",
+ "err:%d errno:%d", err, errno);
+}
+
static void test(void)
{
int listen_fd, cli_fd, accept_fd, epfd, err;
struct epoll_event ev;
socklen_t addrlen;
+ int i;
addrlen = sizeof(struct sockaddr_in6);
ev.events = EPOLLIN;
@@ -308,24 +377,30 @@ static void test(void)
accept_fd, errno);
close(listen_fd);
- /* Send some data from accept_fd to cli_fd */
- err = send(accept_fd, DATA, DATA_LEN, 0);
- CHECK(err != DATA_LEN, "send(accept_fd)", "err:%d errno:%d",
- err, errno);
-
- /* Have some timeout in recv(cli_fd). Just in case. */
ev.data.fd = cli_fd;
err = epoll_ctl(epfd, EPOLL_CTL_ADD, cli_fd, &ev);
CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, cli_fd)", "err:%d errno:%d",
err, errno);
- err = epoll_wait(epfd, &ev, 1, 1000);
- CHECK(err != 1 || ev.data.fd != cli_fd,
- "epoll_wait(cli_fd)", "err:%d errno:%d ev.data.fd:%d cli_fd:%d",
- err, errno, ev.data.fd, cli_fd);
+ init_sk_storage(accept_fd, 2);
- err = recv(cli_fd, NULL, 0, MSG_TRUNC);
- CHECK(err, "recv(cli_fd)", "err:%d errno:%d", err, errno);
+ for (i = 0; i < 2; i++) {
+ /* Send some data from accept_fd to cli_fd */
+ err = send(accept_fd, DATA, DATA_LEN, 0);
+ CHECK(err != DATA_LEN, "send(accept_fd)", "err:%d errno:%d",
+ err, errno);
+
+ /* Have some timeout in recv(cli_fd). Just in case. */
+ err = epoll_wait(epfd, &ev, 1, 1000);
+ CHECK(err != 1 || ev.data.fd != cli_fd,
+ "epoll_wait(cli_fd)", "err:%d errno:%d ev.data.fd:%d cli_fd:%d",
+ err, errno, ev.data.fd, cli_fd);
+
+ err = recv(cli_fd, NULL, 0, MSG_TRUNC);
+ CHECK(err, "recv(cli_fd)", "err:%d errno:%d", err, errno);
+ }
+
+ check_sk_pkt_out_cnt(accept_fd, cli_fd);
close(epfd);
close(accept_fd);
@@ -395,6 +470,14 @@ int main(int argc, char **argv)
CHECK(!map, "cannot find linum_map", "(null)");
linum_map_fd = bpf_map__fd(map);
+ map = bpf_object__find_map_by_name(obj, "sk_pkt_out_cnt");
+ CHECK(!map, "cannot find sk_pkt_out_cnt", "(null)");
+ sk_pkt_out_cnt_fd = bpf_map__fd(map);
+
+ map = bpf_object__find_map_by_name(obj, "sk_pkt_out_cnt10");
+ CHECK(!map, "cannot find sk_pkt_out_cnt10", "(null)");
+ sk_pkt_out_cnt10_fd = bpf_map__fd(map);
+
test();
bpf_object__close(obj);
This patch rides on an existing BPF_PROG_TYPE_CGROUP_SKB test (test_sock_fields.c) to do a TCP end-to-end test on the new bpf_sk_storage_* helpers. Signed-off-by: Martin KaFai Lau <kafai@fb.com> --- tools/testing/selftests/bpf/bpf_helpers.h | 5 + .../bpf/progs/test_sock_fields_kern.c | 49 ++++++++ .../testing/selftests/bpf/test_sock_fields.c | 115 +++++++++++++++--- 3 files changed, 153 insertions(+), 16 deletions(-)