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net: add queue argument to __skb_wait_for_more_packets and __skb_{,try_}recv_datagram 

This will be used by ESP over TCP to handle the queue of IKE messages.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Sabrina Dubroca 2019-11-25 14:48:57 +01:00 committed by Steffen Klassert
parent e7096c131e
commit b50b0580d2
4 changed files with 31 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/skbuff.h
View File

@ -3459,7 +3459,8 @@ static inline void skb_frag_list_init(struct sk_buff *skb)
for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next) for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)
int __skb_wait_for_more_packets(struct sock *sk, int *err, long *timeo_p, int __skb_wait_for_more_packets(struct sock *sk, struct sk_buff_head *queue,
int *err, long *timeo_p,
const struct sk_buff *skb); const struct sk_buff *skb);
struct sk_buff *__skb_try_recv_from_queue(struct sock *sk, struct sk_buff *__skb_try_recv_from_queue(struct sock *sk,
struct sk_buff_head *queue, struct sk_buff_head *queue,
@ -3468,12 +3469,16 @@ struct sk_buff *__skb_try_recv_from_queue(struct sock *sk,
struct sk_buff *skb), struct sk_buff *skb),
int *off, int *err, int *off, int *err,
struct sk_buff **last); struct sk_buff **last);
struct sk_buff *__skb_try_recv_datagram(struct sock *sk, unsigned flags, struct sk_buff *__skb_try_recv_datagram(struct sock *sk,
struct sk_buff_head *queue,
unsigned int flags,
void (*destructor)(struct sock *sk, void (*destructor)(struct sock *sk,
struct sk_buff *skb), struct sk_buff *skb),
int *off, int *err, int *off, int *err,
struct sk_buff **last); struct sk_buff **last);
struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags, struct sk_buff *__skb_recv_datagram(struct sock *sk,
struct sk_buff_head *sk_queue,
unsigned int flags,
void (*destructor)(struct sock *sk, void (*destructor)(struct sock *sk,
struct sk_buff *skb), struct sk_buff *skb),
int *off, int *err); int *off, int *err);

27
net/core/datagram.c
View File

@ -84,7 +84,8 @@ static int receiver_wake_function(wait_queue_entry_t *wait, unsigned int mode, i
/* /*
* Wait for the last received packet to be different from skb * Wait for the last received packet to be different from skb
*/ */
int __skb_wait_for_more_packets(struct sock *sk, int *err, long *timeo_p, int __skb_wait_for_more_packets(struct sock *sk, struct sk_buff_head *queue,
int *err, long *timeo_p,
const struct sk_buff *skb) const struct sk_buff *skb)
{ {
int error; int error;
@ -97,7 +98,7 @@ int __skb_wait_for_more_packets(struct sock *sk, int *err, long *timeo_p,
if (error) if (error)
goto out_err; goto out_err;
if (READ_ONCE(sk->sk_receive_queue.prev) != skb) if (READ_ONCE(queue->prev) != skb)
goto out; goto out;
/* Socket shut down? */ /* Socket shut down? */
@ -209,6 +210,7 @@ struct sk_buff *__skb_try_recv_from_queue(struct sock *sk,
/** /**
* __skb_try_recv_datagram - Receive a datagram skbuff * __skb_try_recv_datagram - Receive a datagram skbuff
* @sk: socket * @sk: socket
* @queue: socket queue from which to receive
* @flags: MSG\_ flags * @flags: MSG\_ flags
* @destructor: invoked under the receive lock on successful dequeue * @destructor: invoked under the receive lock on successful dequeue
* @off: an offset in bytes to peek skb from. Returns an offset * @off: an offset in bytes to peek skb from. Returns an offset
@ -241,13 +243,14 @@ struct sk_buff *__skb_try_recv_from_queue(struct sock *sk,
* quite explicitly by POSIX 1003.1g, don't change them without having * quite explicitly by POSIX 1003.1g, don't change them without having
* the standard around please. * the standard around please.
*/ */
struct sk_buff *__skb_try_recv_datagram(struct sock *sk, unsigned int flags, struct sk_buff *__skb_try_recv_datagram(struct sock *sk,
struct sk_buff_head *queue,
unsigned int flags,
void (*destructor)(struct sock *sk, void (*destructor)(struct sock *sk,
struct sk_buff *skb), struct sk_buff *skb),
int *off, int *err, int *off, int *err,
struct sk_buff **last) struct sk_buff **last)
{ {
struct sk_buff_head *queue = &sk->sk_receive_queue;
struct sk_buff *skb; struct sk_buff *skb;
unsigned long cpu_flags; unsigned long cpu_flags;
/* /*
@ -278,7 +281,7 @@ struct sk_buff *__skb_try_recv_datagram(struct sock *sk, unsigned int flags,
break; break;
sk_busy_loop(sk, flags & MSG_DONTWAIT); sk_busy_loop(sk, flags & MSG_DONTWAIT);
} while (READ_ONCE(sk->sk_receive_queue.prev) != *last); } while (READ_ONCE(queue->prev) != *last);
error = -EAGAIN; error = -EAGAIN;
@ -288,7 +291,9 @@ no_packet:
} }
EXPORT_SYMBOL(__skb_try_recv_datagram); EXPORT_SYMBOL(__skb_try_recv_datagram);
struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned int flags, struct sk_buff *__skb_recv_datagram(struct sock *sk,
struct sk_buff_head *sk_queue,
unsigned int flags,
void (*destructor)(struct sock *sk, void (*destructor)(struct sock *sk,
struct sk_buff *skb), struct sk_buff *skb),
int *off, int *err) int *off, int *err)
@ -299,15 +304,16 @@ struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned int flags,
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
do { do {
skb = __skb_try_recv_datagram(sk, flags, destructor, off, err, skb = __skb_try_recv_datagram(sk, sk_queue, flags, destructor,
&last); off, err, &last);
if (skb) if (skb)
return skb; return skb;
if (*err != -EAGAIN) if (*err != -EAGAIN)
break; break;
} while (timeo && } while (timeo &&
!__skb_wait_for_more_packets(sk, err, &timeo, last)); !__skb_wait_for_more_packets(sk, sk_queue, err,
&timeo, last));
return NULL; return NULL;
} }
@ -318,7 +324,8 @@ struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned int flags,
{ {
int off = 0; int off = 0;
return __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), return __skb_recv_datagram(sk, &sk->sk_receive_queue,
flags | (noblock ? MSG_DONTWAIT : 0),
NULL, &off, err); NULL, &off, err);
} }
EXPORT_SYMBOL(skb_recv_datagram); EXPORT_SYMBOL(skb_recv_datagram);

3
net/ipv4/udp.c
View File

@ -1708,7 +1708,8 @@ busy_check:
/* sk_queue is empty, reader_queue may contain peeked packets */ /* sk_queue is empty, reader_queue may contain peeked packets */
} while (timeo && } while (timeo &&
!__skb_wait_for_more_packets(sk, &error, &timeo, !__skb_wait_for_more_packets(sk, &sk->sk_receive_queue,
&error, &timeo,
(struct sk_buff *)sk_queue)); (struct sk_buff *)sk_queue));
*err = error; *err = error;

7
net/unix/af_unix.c
View File

@ -2058,8 +2058,8 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
mutex_lock(&u->iolock); mutex_lock(&u->iolock);
skip = sk_peek_offset(sk, flags); skip = sk_peek_offset(sk, flags);
skb = __skb_try_recv_datagram(sk, flags, NULL, &skip, &err, skb = __skb_try_recv_datagram(sk, &sk->sk_receive_queue, flags,
&last); NULL, &skip, &err, &last);
if (skb) if (skb)
break; break;
@ -2068,7 +2068,8 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
if (err != -EAGAIN) if (err != -EAGAIN)
break; break;
} while (timeo && } while (timeo &&
!__skb_wait_for_more_packets(sk, &err, &timeo, last)); !__skb_wait_for_more_packets(sk, &sk->sk_receive_queue,
&err, &timeo, last));
if (!skb) { /* implies iolock unlocked */ if (!skb) { /* implies iolock unlocked */
unix_state_lock(sk); unix_state_lock(sk);