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Message-Id: <20200218171023.844439-5-jakub@cloudflare.com>
Date: Tue, 18 Feb 2020 17:10:16 +0000
From: Jakub Sitnicki <jakub@...udflare.com>
To: bpf@...r.kernel.org
Cc: netdev@...r.kernel.org, kernel-team@...udflare.com,
John Fastabend <john.fastabend@...il.com>,
Lorenz Bauer <lmb@...udflare.com>, Martin Lau <kafai@...com>
Subject: [PATCH bpf-next v7 04/11] bpf, sockmap: Allow inserting listening TCP sockets into sockmap
In order for sockmap/sockhash types to become generic collections for
storing TCP sockets we need to loosen the checks during map update, while
tightening the checks in redirect helpers.
Currently sock{map,hash} require the TCP socket to be in established state,
which prevents inserting listening sockets.
Change the update pre-checks so the socket can also be in listening state.
Since it doesn't make sense to redirect with sock{map,hash} to listening
sockets, add appropriate socket state checks to BPF redirect helpers too.
Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
net/core/sock_map.c | 59 ++++++++++++++++++-------
tools/testing/selftests/bpf/test_maps.c | 6 +--
2 files changed, 45 insertions(+), 20 deletions(-)
diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 3a7a96ab088a..dd92a3556d73 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -391,7 +391,8 @@ static int sock_map_update_common(struct bpf_map *map, u32 idx,
static bool sock_map_op_okay(const struct bpf_sock_ops_kern *ops)
{
return ops->op == BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB ||
- ops->op == BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB;
+ ops->op == BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB ||
+ ops->op == BPF_SOCK_OPS_TCP_LISTEN_CB;
}
static bool sock_map_sk_is_suitable(const struct sock *sk)
@@ -400,6 +401,16 @@ static bool sock_map_sk_is_suitable(const struct sock *sk)
sk->sk_protocol == IPPROTO_TCP;
}
+static bool sock_map_sk_state_allowed(const struct sock *sk)
+{
+ return (1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_LISTEN);
+}
+
+static bool sock_map_redirect_allowed(const struct sock *sk)
+{
+ return sk->sk_state != TCP_LISTEN;
+}
+
static int sock_map_update_elem(struct bpf_map *map, void *key,
void *value, u64 flags)
{
@@ -423,7 +434,7 @@ static int sock_map_update_elem(struct bpf_map *map, void *key,
}
sock_map_sk_acquire(sk);
- if (sk->sk_state != TCP_ESTABLISHED)
+ if (!sock_map_sk_state_allowed(sk))
ret = -EOPNOTSUPP;
else
ret = sock_map_update_common(map, idx, sk, flags);
@@ -460,13 +471,17 @@ BPF_CALL_4(bpf_sk_redirect_map, struct sk_buff *, skb,
struct bpf_map *, map, u32, key, u64, flags)
{
struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
+ struct sock *sk;
if (unlikely(flags & ~(BPF_F_INGRESS)))
return SK_DROP;
- tcb->bpf.flags = flags;
- tcb->bpf.sk_redir = __sock_map_lookup_elem(map, key);
- if (!tcb->bpf.sk_redir)
+
+ sk = __sock_map_lookup_elem(map, key);
+ if (unlikely(!sk || !sock_map_redirect_allowed(sk)))
return SK_DROP;
+
+ tcb->bpf.flags = flags;
+ tcb->bpf.sk_redir = sk;
return SK_PASS;
}
@@ -483,12 +498,17 @@ const struct bpf_func_proto bpf_sk_redirect_map_proto = {
BPF_CALL_4(bpf_msg_redirect_map, struct sk_msg *, msg,
struct bpf_map *, map, u32, key, u64, flags)
{
+ struct sock *sk;
+
if (unlikely(flags & ~(BPF_F_INGRESS)))
return SK_DROP;
- msg->flags = flags;
- msg->sk_redir = __sock_map_lookup_elem(map, key);
- if (!msg->sk_redir)
+
+ sk = __sock_map_lookup_elem(map, key);
+ if (unlikely(!sk || !sock_map_redirect_allowed(sk)))
return SK_DROP;
+
+ msg->flags = flags;
+ msg->sk_redir = sk;
return SK_PASS;
}
@@ -748,7 +768,7 @@ static int sock_hash_update_elem(struct bpf_map *map, void *key,
}
sock_map_sk_acquire(sk);
- if (sk->sk_state != TCP_ESTABLISHED)
+ if (!sock_map_sk_state_allowed(sk))
ret = -EOPNOTSUPP;
else
ret = sock_hash_update_common(map, key, sk, flags);
@@ -916,13 +936,17 @@ BPF_CALL_4(bpf_sk_redirect_hash, struct sk_buff *, skb,
struct bpf_map *, map, void *, key, u64, flags)
{
struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
+ struct sock *sk;
if (unlikely(flags & ~(BPF_F_INGRESS)))
return SK_DROP;
- tcb->bpf.flags = flags;
- tcb->bpf.sk_redir = __sock_hash_lookup_elem(map, key);
- if (!tcb->bpf.sk_redir)
+
+ sk = __sock_hash_lookup_elem(map, key);
+ if (unlikely(!sk || !sock_map_redirect_allowed(sk)))
return SK_DROP;
+
+ tcb->bpf.flags = flags;
+ tcb->bpf.sk_redir = sk;
return SK_PASS;
}
@@ -939,12 +963,17 @@ const struct bpf_func_proto bpf_sk_redirect_hash_proto = {
BPF_CALL_4(bpf_msg_redirect_hash, struct sk_msg *, msg,
struct bpf_map *, map, void *, key, u64, flags)
{
+ struct sock *sk;
+
if (unlikely(flags & ~(BPF_F_INGRESS)))
return SK_DROP;
- msg->flags = flags;
- msg->sk_redir = __sock_hash_lookup_elem(map, key);
- if (!msg->sk_redir)
+
+ sk = __sock_hash_lookup_elem(map, key);
+ if (unlikely(!sk || !sock_map_redirect_allowed(sk)))
return SK_DROP;
+
+ msg->flags = flags;
+ msg->sk_redir = sk;
return SK_PASS;
}
diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index 02eae1e864c2..c6766b2cff85 100644
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -756,11 +756,7 @@ static void test_sockmap(unsigned int tasks, void *data)
/* Test update without programs */
for (i = 0; i < 6; i++) {
err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
- if (i < 2 && !err) {
- printf("Allowed update sockmap '%i:%i' not in ESTABLISHED\n",
- i, sfd[i]);
- goto out_sockmap;
- } else if (i >= 2 && err) {
+ if (err) {
printf("Failed noprog update sockmap '%i:%i'\n",
i, sfd[i]);
goto out_sockmap;
--
2.24.1
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