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-rw-r--r--net/key/af_key.c120
1 files changed, 91 insertions, 29 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 7cb6f121336..50c442fc99c 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -48,6 +48,17 @@ struct pfkey_sock {
struct sock sk;
int registered;
int promisc;
+
+ struct {
+ uint8_t msg_version;
+ uint32_t msg_pid;
+ int (*dump)(struct pfkey_sock *sk);
+ void (*done)(struct pfkey_sock *sk);
+ union {
+ struct xfrm_policy_walk policy;
+ struct xfrm_state_walk state;
+ } u;
+ } dump;
};
static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
@@ -55,6 +66,27 @@ static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
return (struct pfkey_sock *)sk;
}
+static int pfkey_can_dump(struct sock *sk)
+{
+ if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
+ return 1;
+ return 0;
+}
+
+static int pfkey_do_dump(struct pfkey_sock *pfk)
+{
+ int rc;
+
+ rc = pfk->dump.dump(pfk);
+ if (rc == -ENOBUFS)
+ return 0;
+
+ pfk->dump.done(pfk);
+ pfk->dump.dump = NULL;
+ pfk->dump.done = NULL;
+ return rc;
+}
+
static void pfkey_sock_destruct(struct sock *sk)
{
skb_queue_purge(&sk->sk_receive_queue);
@@ -1709,51 +1741,60 @@ static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hd
return 0;
}
-struct pfkey_dump_data
-{
- struct sk_buff *skb;
- struct sadb_msg *hdr;
- struct sock *sk;
-};
-
static int dump_sa(struct xfrm_state *x, int count, void *ptr)
{
- struct pfkey_dump_data *data = ptr;
+ struct pfkey_sock *pfk = ptr;
struct sk_buff *out_skb;
struct sadb_msg *out_hdr;
+ if (!pfkey_can_dump(&pfk->sk))
+ return -ENOBUFS;
+
out_skb = pfkey_xfrm_state2msg(x);
if (IS_ERR(out_skb))
return PTR_ERR(out_skb);
out_hdr = (struct sadb_msg *) out_skb->data;
- out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
+ out_hdr->sadb_msg_version = pfk->dump.msg_version;
out_hdr->sadb_msg_type = SADB_DUMP;
out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
out_hdr->sadb_msg_errno = 0;
out_hdr->sadb_msg_reserved = 0;
out_hdr->sadb_msg_seq = count;
- out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
- pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
+ out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
+ pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
return 0;
}
+static int pfkey_dump_sa(struct pfkey_sock *pfk)
+{
+ return xfrm_state_walk(&pfk->dump.u.state, dump_sa, (void *) pfk);
+}
+
+static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
+{
+ xfrm_state_walk_done(&pfk->dump.u.state);
+}
+
static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
u8 proto;
- struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
- struct xfrm_state_walk walk;
- int rc;
+ struct pfkey_sock *pfk = pfkey_sk(sk);
+
+ if (pfk->dump.dump != NULL)
+ return -EBUSY;
proto = pfkey_satype2proto(hdr->sadb_msg_satype);
if (proto == 0)
return -EINVAL;
- xfrm_state_walk_init(&walk, proto);
- rc = xfrm_state_walk(&walk, dump_sa, &data);
- xfrm_state_walk_done(&walk);
+ pfk->dump.msg_version = hdr->sadb_msg_version;
+ pfk->dump.msg_pid = hdr->sadb_msg_pid;
+ pfk->dump.dump = pfkey_dump_sa;
+ pfk->dump.done = pfkey_dump_sa_done;
+ xfrm_state_walk_init(&pfk->dump.u.state, proto);
- return rc;
+ return pfkey_do_dump(pfk);
}
static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
@@ -2648,11 +2689,14 @@ out:
static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
- struct pfkey_dump_data *data = ptr;
+ struct pfkey_sock *pfk = ptr;
struct sk_buff *out_skb;
struct sadb_msg *out_hdr;
int err;
+ if (!pfkey_can_dump(&pfk->sk))
+ return -ENOBUFS;
+
out_skb = pfkey_xfrm_policy2msg_prep(xp);
if (IS_ERR(out_skb))
return PTR_ERR(out_skb);
@@ -2662,27 +2706,40 @@ static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
return err;
out_hdr = (struct sadb_msg *) out_skb->data;
- out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
+ out_hdr->sadb_msg_version = pfk->dump.msg_version;
out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
out_hdr->sadb_msg_errno = 0;
out_hdr->sadb_msg_seq = count;
- out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
- pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
+ out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
+ pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
return 0;
}
+static int pfkey_dump_sp(struct pfkey_sock *pfk)
+{
+ return xfrm_policy_walk(&pfk->dump.u.policy, dump_sp, (void *) pfk);
+}
+
+static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
+{
+ xfrm_policy_walk_done(&pfk->dump.u.policy);
+}
+
static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
- struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
- struct xfrm_policy_walk walk;
- int rc;
+ struct pfkey_sock *pfk = pfkey_sk(sk);
- xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
- rc = xfrm_policy_walk(&walk, dump_sp, &data);
- xfrm_policy_walk_done(&walk);
+ if (pfk->dump.dump != NULL)
+ return -EBUSY;
- return rc;
+ pfk->dump.msg_version = hdr->sadb_msg_version;
+ pfk->dump.msg_pid = hdr->sadb_msg_pid;
+ pfk->dump.dump = pfkey_dump_sp;
+ pfk->dump.done = pfkey_dump_sp_done;
+ xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
+
+ return pfkey_do_dump(pfk);
}
static int key_notify_policy_flush(struct km_event *c)
@@ -3687,6 +3744,7 @@ static int pfkey_recvmsg(struct kiocb *kiocb,
int flags)
{
struct sock *sk = sock->sk;
+ struct pfkey_sock *pfk = pfkey_sk(sk);
struct sk_buff *skb;
int copied, err;
@@ -3714,6 +3772,10 @@ static int pfkey_recvmsg(struct kiocb *kiocb,
err = (flags & MSG_TRUNC) ? skb->len : copied;
+ if (pfk->dump.dump != NULL &&
+ 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
+ pfkey_do_dump(pfk);
+
out_free:
skb_free_datagram(sk, skb);
out:
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-15 21:12:10 +0000