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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Jakub Kicinski](/assets/img/avatar_default.png)
sock.h is pretty heavily used (5k objects rebuilt on x86 after it's touched). We can drop the include of filter.h from it and add a forward declaration of struct sk_filter instead. This decreases the number of rebuilt objects when bpf.h is touched from ~5k to ~1k. There's a lot of missing includes this was masking. Primarily in networking tho, this time. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com> Acked-by: Stefano Garzarella <sgarzare@redhat.com> Link: https://lore.kernel.org/bpf/20211229004913.513372-1-kuba@kernel.org
2106 lines
45 KiB
C
2106 lines
45 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Kernel Connection Multiplexor
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*
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* Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
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*/
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#include <linux/bpf.h>
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#include <linux/errno.h>
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#include <linux/errqueue.h>
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#include <linux/file.h>
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#include <linux/filter.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/poll.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/socket.h>
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#include <linux/uaccess.h>
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#include <linux/workqueue.h>
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#include <linux/syscalls.h>
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#include <linux/sched/signal.h>
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#include <net/kcm.h>
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#include <net/netns/generic.h>
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#include <net/sock.h>
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#include <uapi/linux/kcm.h>
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unsigned int kcm_net_id;
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static struct kmem_cache *kcm_psockp __read_mostly;
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static struct kmem_cache *kcm_muxp __read_mostly;
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static struct workqueue_struct *kcm_wq;
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static inline struct kcm_sock *kcm_sk(const struct sock *sk)
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{
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return (struct kcm_sock *)sk;
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}
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static inline struct kcm_tx_msg *kcm_tx_msg(struct sk_buff *skb)
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{
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return (struct kcm_tx_msg *)skb->cb;
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}
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static void report_csk_error(struct sock *csk, int err)
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{
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csk->sk_err = EPIPE;
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sk_error_report(csk);
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}
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static void kcm_abort_tx_psock(struct kcm_psock *psock, int err,
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bool wakeup_kcm)
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{
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struct sock *csk = psock->sk;
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struct kcm_mux *mux = psock->mux;
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/* Unrecoverable error in transmit */
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spin_lock_bh(&mux->lock);
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if (psock->tx_stopped) {
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spin_unlock_bh(&mux->lock);
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return;
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}
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psock->tx_stopped = 1;
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KCM_STATS_INCR(psock->stats.tx_aborts);
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if (!psock->tx_kcm) {
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/* Take off psocks_avail list */
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list_del(&psock->psock_avail_list);
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} else if (wakeup_kcm) {
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/* In this case psock is being aborted while outside of
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* write_msgs and psock is reserved. Schedule tx_work
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* to handle the failure there. Need to commit tx_stopped
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* before queuing work.
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*/
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smp_mb();
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queue_work(kcm_wq, &psock->tx_kcm->tx_work);
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}
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spin_unlock_bh(&mux->lock);
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/* Report error on lower socket */
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report_csk_error(csk, err);
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}
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/* RX mux lock held. */
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static void kcm_update_rx_mux_stats(struct kcm_mux *mux,
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struct kcm_psock *psock)
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{
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STRP_STATS_ADD(mux->stats.rx_bytes,
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psock->strp.stats.bytes -
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psock->saved_rx_bytes);
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mux->stats.rx_msgs +=
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psock->strp.stats.msgs - psock->saved_rx_msgs;
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psock->saved_rx_msgs = psock->strp.stats.msgs;
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psock->saved_rx_bytes = psock->strp.stats.bytes;
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}
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static void kcm_update_tx_mux_stats(struct kcm_mux *mux,
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struct kcm_psock *psock)
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{
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KCM_STATS_ADD(mux->stats.tx_bytes,
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psock->stats.tx_bytes - psock->saved_tx_bytes);
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mux->stats.tx_msgs +=
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psock->stats.tx_msgs - psock->saved_tx_msgs;
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psock->saved_tx_msgs = psock->stats.tx_msgs;
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psock->saved_tx_bytes = psock->stats.tx_bytes;
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}
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static int kcm_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
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/* KCM is ready to receive messages on its queue-- either the KCM is new or
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* has become unblocked after being blocked on full socket buffer. Queue any
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* pending ready messages on a psock. RX mux lock held.
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*/
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static void kcm_rcv_ready(struct kcm_sock *kcm)
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{
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struct kcm_mux *mux = kcm->mux;
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struct kcm_psock *psock;
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struct sk_buff *skb;
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if (unlikely(kcm->rx_wait || kcm->rx_psock || kcm->rx_disabled))
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return;
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while (unlikely((skb = __skb_dequeue(&mux->rx_hold_queue)))) {
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if (kcm_queue_rcv_skb(&kcm->sk, skb)) {
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/* Assuming buffer limit has been reached */
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skb_queue_head(&mux->rx_hold_queue, skb);
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WARN_ON(!sk_rmem_alloc_get(&kcm->sk));
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return;
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}
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}
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while (!list_empty(&mux->psocks_ready)) {
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psock = list_first_entry(&mux->psocks_ready, struct kcm_psock,
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psock_ready_list);
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if (kcm_queue_rcv_skb(&kcm->sk, psock->ready_rx_msg)) {
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/* Assuming buffer limit has been reached */
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WARN_ON(!sk_rmem_alloc_get(&kcm->sk));
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return;
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}
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/* Consumed the ready message on the psock. Schedule rx_work to
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* get more messages.
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*/
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list_del(&psock->psock_ready_list);
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psock->ready_rx_msg = NULL;
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/* Commit clearing of ready_rx_msg for queuing work */
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smp_mb();
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strp_unpause(&psock->strp);
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strp_check_rcv(&psock->strp);
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}
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/* Buffer limit is okay now, add to ready list */
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list_add_tail(&kcm->wait_rx_list,
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&kcm->mux->kcm_rx_waiters);
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kcm->rx_wait = true;
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}
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static void kcm_rfree(struct sk_buff *skb)
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{
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struct sock *sk = skb->sk;
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struct kcm_sock *kcm = kcm_sk(sk);
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struct kcm_mux *mux = kcm->mux;
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unsigned int len = skb->truesize;
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sk_mem_uncharge(sk, len);
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atomic_sub(len, &sk->sk_rmem_alloc);
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/* For reading rx_wait and rx_psock without holding lock */
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smp_mb__after_atomic();
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if (!kcm->rx_wait && !kcm->rx_psock &&
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sk_rmem_alloc_get(sk) < sk->sk_rcvlowat) {
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spin_lock_bh(&mux->rx_lock);
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kcm_rcv_ready(kcm);
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spin_unlock_bh(&mux->rx_lock);
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}
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}
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static int kcm_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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{
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struct sk_buff_head *list = &sk->sk_receive_queue;
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if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
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return -ENOMEM;
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if (!sk_rmem_schedule(sk, skb, skb->truesize))
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return -ENOBUFS;
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skb->dev = NULL;
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skb_orphan(skb);
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skb->sk = sk;
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skb->destructor = kcm_rfree;
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atomic_add(skb->truesize, &sk->sk_rmem_alloc);
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sk_mem_charge(sk, skb->truesize);
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skb_queue_tail(list, skb);
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if (!sock_flag(sk, SOCK_DEAD))
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sk->sk_data_ready(sk);
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return 0;
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}
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/* Requeue received messages for a kcm socket to other kcm sockets. This is
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* called with a kcm socket is receive disabled.
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* RX mux lock held.
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*/
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static void requeue_rx_msgs(struct kcm_mux *mux, struct sk_buff_head *head)
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{
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struct sk_buff *skb;
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struct kcm_sock *kcm;
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while ((skb = __skb_dequeue(head))) {
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/* Reset destructor to avoid calling kcm_rcv_ready */
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skb->destructor = sock_rfree;
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skb_orphan(skb);
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try_again:
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if (list_empty(&mux->kcm_rx_waiters)) {
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skb_queue_tail(&mux->rx_hold_queue, skb);
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continue;
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}
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kcm = list_first_entry(&mux->kcm_rx_waiters,
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struct kcm_sock, wait_rx_list);
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if (kcm_queue_rcv_skb(&kcm->sk, skb)) {
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/* Should mean socket buffer full */
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list_del(&kcm->wait_rx_list);
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kcm->rx_wait = false;
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/* Commit rx_wait to read in kcm_free */
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smp_wmb();
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goto try_again;
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}
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}
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}
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/* Lower sock lock held */
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static struct kcm_sock *reserve_rx_kcm(struct kcm_psock *psock,
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struct sk_buff *head)
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{
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struct kcm_mux *mux = psock->mux;
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struct kcm_sock *kcm;
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WARN_ON(psock->ready_rx_msg);
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if (psock->rx_kcm)
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return psock->rx_kcm;
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spin_lock_bh(&mux->rx_lock);
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if (psock->rx_kcm) {
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spin_unlock_bh(&mux->rx_lock);
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return psock->rx_kcm;
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}
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kcm_update_rx_mux_stats(mux, psock);
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if (list_empty(&mux->kcm_rx_waiters)) {
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psock->ready_rx_msg = head;
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strp_pause(&psock->strp);
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list_add_tail(&psock->psock_ready_list,
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&mux->psocks_ready);
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spin_unlock_bh(&mux->rx_lock);
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return NULL;
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}
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kcm = list_first_entry(&mux->kcm_rx_waiters,
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struct kcm_sock, wait_rx_list);
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list_del(&kcm->wait_rx_list);
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kcm->rx_wait = false;
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psock->rx_kcm = kcm;
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kcm->rx_psock = psock;
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spin_unlock_bh(&mux->rx_lock);
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return kcm;
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}
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static void kcm_done(struct kcm_sock *kcm);
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static void kcm_done_work(struct work_struct *w)
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{
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kcm_done(container_of(w, struct kcm_sock, done_work));
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}
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/* Lower sock held */
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static void unreserve_rx_kcm(struct kcm_psock *psock,
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bool rcv_ready)
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{
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struct kcm_sock *kcm = psock->rx_kcm;
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struct kcm_mux *mux = psock->mux;
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if (!kcm)
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return;
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spin_lock_bh(&mux->rx_lock);
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psock->rx_kcm = NULL;
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kcm->rx_psock = NULL;
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/* Commit kcm->rx_psock before sk_rmem_alloc_get to sync with
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* kcm_rfree
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*/
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smp_mb();
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if (unlikely(kcm->done)) {
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spin_unlock_bh(&mux->rx_lock);
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/* Need to run kcm_done in a task since we need to qcquire
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* callback locks which may already be held here.
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*/
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INIT_WORK(&kcm->done_work, kcm_done_work);
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schedule_work(&kcm->done_work);
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return;
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}
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if (unlikely(kcm->rx_disabled)) {
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requeue_rx_msgs(mux, &kcm->sk.sk_receive_queue);
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} else if (rcv_ready || unlikely(!sk_rmem_alloc_get(&kcm->sk))) {
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/* Check for degenerative race with rx_wait that all
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* data was dequeued (accounted for in kcm_rfree).
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*/
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kcm_rcv_ready(kcm);
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}
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spin_unlock_bh(&mux->rx_lock);
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}
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/* Lower sock lock held */
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static void psock_data_ready(struct sock *sk)
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{
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struct kcm_psock *psock;
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read_lock_bh(&sk->sk_callback_lock);
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psock = (struct kcm_psock *)sk->sk_user_data;
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if (likely(psock))
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strp_data_ready(&psock->strp);
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read_unlock_bh(&sk->sk_callback_lock);
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}
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/* Called with lower sock held */
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static void kcm_rcv_strparser(struct strparser *strp, struct sk_buff *skb)
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{
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struct kcm_psock *psock = container_of(strp, struct kcm_psock, strp);
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struct kcm_sock *kcm;
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try_queue:
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kcm = reserve_rx_kcm(psock, skb);
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if (!kcm) {
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/* Unable to reserve a KCM, message is held in psock and strp
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* is paused.
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*/
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return;
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}
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if (kcm_queue_rcv_skb(&kcm->sk, skb)) {
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/* Should mean socket buffer full */
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unreserve_rx_kcm(psock, false);
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goto try_queue;
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}
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}
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static int kcm_parse_func_strparser(struct strparser *strp, struct sk_buff *skb)
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{
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struct kcm_psock *psock = container_of(strp, struct kcm_psock, strp);
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struct bpf_prog *prog = psock->bpf_prog;
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int res;
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res = bpf_prog_run_pin_on_cpu(prog, skb);
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return res;
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}
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static int kcm_read_sock_done(struct strparser *strp, int err)
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{
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struct kcm_psock *psock = container_of(strp, struct kcm_psock, strp);
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unreserve_rx_kcm(psock, true);
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return err;
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}
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static void psock_state_change(struct sock *sk)
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{
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/* TCP only does a EPOLLIN for a half close. Do a EPOLLHUP here
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* since application will normally not poll with EPOLLIN
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* on the TCP sockets.
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*/
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report_csk_error(sk, EPIPE);
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}
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static void psock_write_space(struct sock *sk)
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{
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struct kcm_psock *psock;
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struct kcm_mux *mux;
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struct kcm_sock *kcm;
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read_lock_bh(&sk->sk_callback_lock);
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psock = (struct kcm_psock *)sk->sk_user_data;
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if (unlikely(!psock))
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goto out;
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mux = psock->mux;
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spin_lock_bh(&mux->lock);
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/* Check if the socket is reserved so someone is waiting for sending. */
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kcm = psock->tx_kcm;
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if (kcm && !unlikely(kcm->tx_stopped))
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queue_work(kcm_wq, &kcm->tx_work);
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spin_unlock_bh(&mux->lock);
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out:
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read_unlock_bh(&sk->sk_callback_lock);
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}
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static void unreserve_psock(struct kcm_sock *kcm);
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|
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/* kcm sock is locked. */
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static struct kcm_psock *reserve_psock(struct kcm_sock *kcm)
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{
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struct kcm_mux *mux = kcm->mux;
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struct kcm_psock *psock;
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psock = kcm->tx_psock;
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|
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smp_rmb(); /* Must read tx_psock before tx_wait */
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|
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if (psock) {
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WARN_ON(kcm->tx_wait);
|
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if (unlikely(psock->tx_stopped))
|
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unreserve_psock(kcm);
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else
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return kcm->tx_psock;
|
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}
|
|
|
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spin_lock_bh(&mux->lock);
|
|
|
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/* Check again under lock to see if psock was reserved for this
|
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* psock via psock_unreserve.
|
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*/
|
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psock = kcm->tx_psock;
|
|
if (unlikely(psock)) {
|
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WARN_ON(kcm->tx_wait);
|
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spin_unlock_bh(&mux->lock);
|
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return kcm->tx_psock;
|
|
}
|
|
|
|
if (!list_empty(&mux->psocks_avail)) {
|
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psock = list_first_entry(&mux->psocks_avail,
|
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struct kcm_psock,
|
|
psock_avail_list);
|
|
list_del(&psock->psock_avail_list);
|
|
if (kcm->tx_wait) {
|
|
list_del(&kcm->wait_psock_list);
|
|
kcm->tx_wait = false;
|
|
}
|
|
kcm->tx_psock = psock;
|
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psock->tx_kcm = kcm;
|
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KCM_STATS_INCR(psock->stats.reserved);
|
|
} else if (!kcm->tx_wait) {
|
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list_add_tail(&kcm->wait_psock_list,
|
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&mux->kcm_tx_waiters);
|
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kcm->tx_wait = true;
|
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}
|
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|
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spin_unlock_bh(&mux->lock);
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|
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return psock;
|
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}
|
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|
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/* mux lock held */
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static void psock_now_avail(struct kcm_psock *psock)
|
|
{
|
|
struct kcm_mux *mux = psock->mux;
|
|
struct kcm_sock *kcm;
|
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|
|
if (list_empty(&mux->kcm_tx_waiters)) {
|
|
list_add_tail(&psock->psock_avail_list,
|
|
&mux->psocks_avail);
|
|
} else {
|
|
kcm = list_first_entry(&mux->kcm_tx_waiters,
|
|
struct kcm_sock,
|
|
wait_psock_list);
|
|
list_del(&kcm->wait_psock_list);
|
|
kcm->tx_wait = false;
|
|
psock->tx_kcm = kcm;
|
|
|
|
/* Commit before changing tx_psock since that is read in
|
|
* reserve_psock before queuing work.
|
|
*/
|
|
smp_mb();
|
|
|
|
kcm->tx_psock = psock;
|
|
KCM_STATS_INCR(psock->stats.reserved);
|
|
queue_work(kcm_wq, &kcm->tx_work);
|
|
}
|
|
}
|
|
|
|
/* kcm sock is locked. */
|
|
static void unreserve_psock(struct kcm_sock *kcm)
|
|
{
|
|
struct kcm_psock *psock;
|
|
struct kcm_mux *mux = kcm->mux;
|
|
|
|
spin_lock_bh(&mux->lock);
|
|
|
|
psock = kcm->tx_psock;
|
|
|
|
if (WARN_ON(!psock)) {
|
|
spin_unlock_bh(&mux->lock);
|
|
return;
|
|
}
|
|
|
|
smp_rmb(); /* Read tx_psock before tx_wait */
|
|
|
|
kcm_update_tx_mux_stats(mux, psock);
|
|
|
|
WARN_ON(kcm->tx_wait);
|
|
|
|
kcm->tx_psock = NULL;
|
|
psock->tx_kcm = NULL;
|
|
KCM_STATS_INCR(psock->stats.unreserved);
|
|
|
|
if (unlikely(psock->tx_stopped)) {
|
|
if (psock->done) {
|
|
/* Deferred free */
|
|
list_del(&psock->psock_list);
|
|
mux->psocks_cnt--;
|
|
sock_put(psock->sk);
|
|
fput(psock->sk->sk_socket->file);
|
|
kmem_cache_free(kcm_psockp, psock);
|
|
}
|
|
|
|
/* Don't put back on available list */
|
|
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
return;
|
|
}
|
|
|
|
psock_now_avail(psock);
|
|
|
|
spin_unlock_bh(&mux->lock);
|
|
}
|
|
|
|
static void kcm_report_tx_retry(struct kcm_sock *kcm)
|
|
{
|
|
struct kcm_mux *mux = kcm->mux;
|
|
|
|
spin_lock_bh(&mux->lock);
|
|
KCM_STATS_INCR(mux->stats.tx_retries);
|
|
spin_unlock_bh(&mux->lock);
|
|
}
|
|
|
|
/* Write any messages ready on the kcm socket. Called with kcm sock lock
|
|
* held. Return bytes actually sent or error.
|
|
*/
|
|
static int kcm_write_msgs(struct kcm_sock *kcm)
|
|
{
|
|
struct sock *sk = &kcm->sk;
|
|
struct kcm_psock *psock;
|
|
struct sk_buff *skb, *head;
|
|
struct kcm_tx_msg *txm;
|
|
unsigned short fragidx, frag_offset;
|
|
unsigned int sent, total_sent = 0;
|
|
int ret = 0;
|
|
|
|
kcm->tx_wait_more = false;
|
|
psock = kcm->tx_psock;
|
|
if (unlikely(psock && psock->tx_stopped)) {
|
|
/* A reserved psock was aborted asynchronously. Unreserve
|
|
* it and we'll retry the message.
|
|
*/
|
|
unreserve_psock(kcm);
|
|
kcm_report_tx_retry(kcm);
|
|
if (skb_queue_empty(&sk->sk_write_queue))
|
|
return 0;
|
|
|
|
kcm_tx_msg(skb_peek(&sk->sk_write_queue))->sent = 0;
|
|
|
|
} else if (skb_queue_empty(&sk->sk_write_queue)) {
|
|
return 0;
|
|
}
|
|
|
|
head = skb_peek(&sk->sk_write_queue);
|
|
txm = kcm_tx_msg(head);
|
|
|
|
if (txm->sent) {
|
|
/* Send of first skbuff in queue already in progress */
|
|
if (WARN_ON(!psock)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
sent = txm->sent;
|
|
frag_offset = txm->frag_offset;
|
|
fragidx = txm->fragidx;
|
|
skb = txm->frag_skb;
|
|
|
|
goto do_frag;
|
|
}
|
|
|
|
try_again:
|
|
psock = reserve_psock(kcm);
|
|
if (!psock)
|
|
goto out;
|
|
|
|
do {
|
|
skb = head;
|
|
txm = kcm_tx_msg(head);
|
|
sent = 0;
|
|
|
|
do_frag_list:
|
|
if (WARN_ON(!skb_shinfo(skb)->nr_frags)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
for (fragidx = 0; fragidx < skb_shinfo(skb)->nr_frags;
|
|
fragidx++) {
|
|
skb_frag_t *frag;
|
|
|
|
frag_offset = 0;
|
|
do_frag:
|
|
frag = &skb_shinfo(skb)->frags[fragidx];
|
|
if (WARN_ON(!skb_frag_size(frag))) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = kernel_sendpage(psock->sk->sk_socket,
|
|
skb_frag_page(frag),
|
|
skb_frag_off(frag) + frag_offset,
|
|
skb_frag_size(frag) - frag_offset,
|
|
MSG_DONTWAIT);
|
|
if (ret <= 0) {
|
|
if (ret == -EAGAIN) {
|
|
/* Save state to try again when there's
|
|
* write space on the socket
|
|
*/
|
|
txm->sent = sent;
|
|
txm->frag_offset = frag_offset;
|
|
txm->fragidx = fragidx;
|
|
txm->frag_skb = skb;
|
|
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* Hard failure in sending message, abort this
|
|
* psock since it has lost framing
|
|
* synchronization and retry sending the
|
|
* message from the beginning.
|
|
*/
|
|
kcm_abort_tx_psock(psock, ret ? -ret : EPIPE,
|
|
true);
|
|
unreserve_psock(kcm);
|
|
|
|
txm->sent = 0;
|
|
kcm_report_tx_retry(kcm);
|
|
ret = 0;
|
|
|
|
goto try_again;
|
|
}
|
|
|
|
sent += ret;
|
|
frag_offset += ret;
|
|
KCM_STATS_ADD(psock->stats.tx_bytes, ret);
|
|
if (frag_offset < skb_frag_size(frag)) {
|
|
/* Not finished with this frag */
|
|
goto do_frag;
|
|
}
|
|
}
|
|
|
|
if (skb == head) {
|
|
if (skb_has_frag_list(skb)) {
|
|
skb = skb_shinfo(skb)->frag_list;
|
|
goto do_frag_list;
|
|
}
|
|
} else if (skb->next) {
|
|
skb = skb->next;
|
|
goto do_frag_list;
|
|
}
|
|
|
|
/* Successfully sent the whole packet, account for it. */
|
|
skb_dequeue(&sk->sk_write_queue);
|
|
kfree_skb(head);
|
|
sk->sk_wmem_queued -= sent;
|
|
total_sent += sent;
|
|
KCM_STATS_INCR(psock->stats.tx_msgs);
|
|
} while ((head = skb_peek(&sk->sk_write_queue)));
|
|
out:
|
|
if (!head) {
|
|
/* Done with all queued messages. */
|
|
WARN_ON(!skb_queue_empty(&sk->sk_write_queue));
|
|
unreserve_psock(kcm);
|
|
}
|
|
|
|
/* Check if write space is available */
|
|
sk->sk_write_space(sk);
|
|
|
|
return total_sent ? : ret;
|
|
}
|
|
|
|
static void kcm_tx_work(struct work_struct *w)
|
|
{
|
|
struct kcm_sock *kcm = container_of(w, struct kcm_sock, tx_work);
|
|
struct sock *sk = &kcm->sk;
|
|
int err;
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Primarily for SOCK_DGRAM sockets, also handle asynchronous tx
|
|
* aborts
|
|
*/
|
|
err = kcm_write_msgs(kcm);
|
|
if (err < 0) {
|
|
/* Hard failure in write, report error on KCM socket */
|
|
pr_warn("KCM: Hard failure on kcm_write_msgs %d\n", err);
|
|
report_csk_error(&kcm->sk, -err);
|
|
goto out;
|
|
}
|
|
|
|
/* Primarily for SOCK_SEQPACKET sockets */
|
|
if (likely(sk->sk_socket) &&
|
|
test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
|
|
clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
sk->sk_write_space(sk);
|
|
}
|
|
|
|
out:
|
|
release_sock(sk);
|
|
}
|
|
|
|
static void kcm_push(struct kcm_sock *kcm)
|
|
{
|
|
if (kcm->tx_wait_more)
|
|
kcm_write_msgs(kcm);
|
|
}
|
|
|
|
static ssize_t kcm_sendpage(struct socket *sock, struct page *page,
|
|
int offset, size_t size, int flags)
|
|
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct kcm_sock *kcm = kcm_sk(sk);
|
|
struct sk_buff *skb = NULL, *head = NULL;
|
|
long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
|
|
bool eor;
|
|
int err = 0;
|
|
int i;
|
|
|
|
if (flags & MSG_SENDPAGE_NOTLAST)
|
|
flags |= MSG_MORE;
|
|
|
|
/* No MSG_EOR from splice, only look at MSG_MORE */
|
|
eor = !(flags & MSG_MORE);
|
|
|
|
lock_sock(sk);
|
|
|
|
sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
|
|
|
|
err = -EPIPE;
|
|
if (sk->sk_err)
|
|
goto out_error;
|
|
|
|
if (kcm->seq_skb) {
|
|
/* Previously opened message */
|
|
head = kcm->seq_skb;
|
|
skb = kcm_tx_msg(head)->last_skb;
|
|
i = skb_shinfo(skb)->nr_frags;
|
|
|
|
if (skb_can_coalesce(skb, i, page, offset)) {
|
|
skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], size);
|
|
skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
|
|
goto coalesced;
|
|
}
|
|
|
|
if (i >= MAX_SKB_FRAGS) {
|
|
struct sk_buff *tskb;
|
|
|
|
tskb = alloc_skb(0, sk->sk_allocation);
|
|
while (!tskb) {
|
|
kcm_push(kcm);
|
|
err = sk_stream_wait_memory(sk, &timeo);
|
|
if (err)
|
|
goto out_error;
|
|
}
|
|
|
|
if (head == skb)
|
|
skb_shinfo(head)->frag_list = tskb;
|
|
else
|
|
skb->next = tskb;
|
|
|
|
skb = tskb;
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
i = 0;
|
|
}
|
|
} else {
|
|
/* Call the sk_stream functions to manage the sndbuf mem. */
|
|
if (!sk_stream_memory_free(sk)) {
|
|
kcm_push(kcm);
|
|
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
err = sk_stream_wait_memory(sk, &timeo);
|
|
if (err)
|
|
goto out_error;
|
|
}
|
|
|
|
head = alloc_skb(0, sk->sk_allocation);
|
|
while (!head) {
|
|
kcm_push(kcm);
|
|
err = sk_stream_wait_memory(sk, &timeo);
|
|
if (err)
|
|
goto out_error;
|
|
}
|
|
|
|
skb = head;
|
|
i = 0;
|
|
}
|
|
|
|
get_page(page);
|
|
skb_fill_page_desc(skb, i, page, offset, size);
|
|
skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
|
|
|
|
coalesced:
|
|
skb->len += size;
|
|
skb->data_len += size;
|
|
skb->truesize += size;
|
|
sk->sk_wmem_queued += size;
|
|
sk_mem_charge(sk, size);
|
|
|
|
if (head != skb) {
|
|
head->len += size;
|
|
head->data_len += size;
|
|
head->truesize += size;
|
|
}
|
|
|
|
if (eor) {
|
|
bool not_busy = skb_queue_empty(&sk->sk_write_queue);
|
|
|
|
/* Message complete, queue it on send buffer */
|
|
__skb_queue_tail(&sk->sk_write_queue, head);
|
|
kcm->seq_skb = NULL;
|
|
KCM_STATS_INCR(kcm->stats.tx_msgs);
|
|
|
|
if (flags & MSG_BATCH) {
|
|
kcm->tx_wait_more = true;
|
|
} else if (kcm->tx_wait_more || not_busy) {
|
|
err = kcm_write_msgs(kcm);
|
|
if (err < 0) {
|
|
/* We got a hard error in write_msgs but have
|
|
* already queued this message. Report an error
|
|
* in the socket, but don't affect return value
|
|
* from sendmsg
|
|
*/
|
|
pr_warn("KCM: Hard failure on kcm_write_msgs\n");
|
|
report_csk_error(&kcm->sk, -err);
|
|
}
|
|
}
|
|
} else {
|
|
/* Message not complete, save state */
|
|
kcm->seq_skb = head;
|
|
kcm_tx_msg(head)->last_skb = skb;
|
|
}
|
|
|
|
KCM_STATS_ADD(kcm->stats.tx_bytes, size);
|
|
|
|
release_sock(sk);
|
|
return size;
|
|
|
|
out_error:
|
|
kcm_push(kcm);
|
|
|
|
err = sk_stream_error(sk, flags, err);
|
|
|
|
/* make sure we wake any epoll edge trigger waiter */
|
|
if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && err == -EAGAIN))
|
|
sk->sk_write_space(sk);
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int kcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct kcm_sock *kcm = kcm_sk(sk);
|
|
struct sk_buff *skb = NULL, *head = NULL;
|
|
size_t copy, copied = 0;
|
|
long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
|
|
int eor = (sock->type == SOCK_DGRAM) ?
|
|
!(msg->msg_flags & MSG_MORE) : !!(msg->msg_flags & MSG_EOR);
|
|
int err = -EPIPE;
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Per tcp_sendmsg this should be in poll */
|
|
sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
|
|
|
|
if (sk->sk_err)
|
|
goto out_error;
|
|
|
|
if (kcm->seq_skb) {
|
|
/* Previously opened message */
|
|
head = kcm->seq_skb;
|
|
skb = kcm_tx_msg(head)->last_skb;
|
|
goto start;
|
|
}
|
|
|
|
/* Call the sk_stream functions to manage the sndbuf mem. */
|
|
if (!sk_stream_memory_free(sk)) {
|
|
kcm_push(kcm);
|
|
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
err = sk_stream_wait_memory(sk, &timeo);
|
|
if (err)
|
|
goto out_error;
|
|
}
|
|
|
|
if (msg_data_left(msg)) {
|
|
/* New message, alloc head skb */
|
|
head = alloc_skb(0, sk->sk_allocation);
|
|
while (!head) {
|
|
kcm_push(kcm);
|
|
err = sk_stream_wait_memory(sk, &timeo);
|
|
if (err)
|
|
goto out_error;
|
|
|
|
head = alloc_skb(0, sk->sk_allocation);
|
|
}
|
|
|
|
skb = head;
|
|
|
|
/* Set ip_summed to CHECKSUM_UNNECESSARY to avoid calling
|
|
* csum_and_copy_from_iter from skb_do_copy_data_nocache.
|
|
*/
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
}
|
|
|
|
start:
|
|
while (msg_data_left(msg)) {
|
|
bool merge = true;
|
|
int i = skb_shinfo(skb)->nr_frags;
|
|
struct page_frag *pfrag = sk_page_frag(sk);
|
|
|
|
if (!sk_page_frag_refill(sk, pfrag))
|
|
goto wait_for_memory;
|
|
|
|
if (!skb_can_coalesce(skb, i, pfrag->page,
|
|
pfrag->offset)) {
|
|
if (i == MAX_SKB_FRAGS) {
|
|
struct sk_buff *tskb;
|
|
|
|
tskb = alloc_skb(0, sk->sk_allocation);
|
|
if (!tskb)
|
|
goto wait_for_memory;
|
|
|
|
if (head == skb)
|
|
skb_shinfo(head)->frag_list = tskb;
|
|
else
|
|
skb->next = tskb;
|
|
|
|
skb = tskb;
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
continue;
|
|
}
|
|
merge = false;
|
|
}
|
|
|
|
copy = min_t(int, msg_data_left(msg),
|
|
pfrag->size - pfrag->offset);
|
|
|
|
if (!sk_wmem_schedule(sk, copy))
|
|
goto wait_for_memory;
|
|
|
|
err = skb_copy_to_page_nocache(sk, &msg->msg_iter, skb,
|
|
pfrag->page,
|
|
pfrag->offset,
|
|
copy);
|
|
if (err)
|
|
goto out_error;
|
|
|
|
/* Update the skb. */
|
|
if (merge) {
|
|
skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
|
|
} else {
|
|
skb_fill_page_desc(skb, i, pfrag->page,
|
|
pfrag->offset, copy);
|
|
get_page(pfrag->page);
|
|
}
|
|
|
|
pfrag->offset += copy;
|
|
copied += copy;
|
|
if (head != skb) {
|
|
head->len += copy;
|
|
head->data_len += copy;
|
|
}
|
|
|
|
continue;
|
|
|
|
wait_for_memory:
|
|
kcm_push(kcm);
|
|
err = sk_stream_wait_memory(sk, &timeo);
|
|
if (err)
|
|
goto out_error;
|
|
}
|
|
|
|
if (eor) {
|
|
bool not_busy = skb_queue_empty(&sk->sk_write_queue);
|
|
|
|
if (head) {
|
|
/* Message complete, queue it on send buffer */
|
|
__skb_queue_tail(&sk->sk_write_queue, head);
|
|
kcm->seq_skb = NULL;
|
|
KCM_STATS_INCR(kcm->stats.tx_msgs);
|
|
}
|
|
|
|
if (msg->msg_flags & MSG_BATCH) {
|
|
kcm->tx_wait_more = true;
|
|
} else if (kcm->tx_wait_more || not_busy) {
|
|
err = kcm_write_msgs(kcm);
|
|
if (err < 0) {
|
|
/* We got a hard error in write_msgs but have
|
|
* already queued this message. Report an error
|
|
* in the socket, but don't affect return value
|
|
* from sendmsg
|
|
*/
|
|
pr_warn("KCM: Hard failure on kcm_write_msgs\n");
|
|
report_csk_error(&kcm->sk, -err);
|
|
}
|
|
}
|
|
} else {
|
|
/* Message not complete, save state */
|
|
partial_message:
|
|
if (head) {
|
|
kcm->seq_skb = head;
|
|
kcm_tx_msg(head)->last_skb = skb;
|
|
}
|
|
}
|
|
|
|
KCM_STATS_ADD(kcm->stats.tx_bytes, copied);
|
|
|
|
release_sock(sk);
|
|
return copied;
|
|
|
|
out_error:
|
|
kcm_push(kcm);
|
|
|
|
if (copied && sock->type == SOCK_SEQPACKET) {
|
|
/* Wrote some bytes before encountering an
|
|
* error, return partial success.
|
|
*/
|
|
goto partial_message;
|
|
}
|
|
|
|
if (head != kcm->seq_skb)
|
|
kfree_skb(head);
|
|
|
|
err = sk_stream_error(sk, msg->msg_flags, err);
|
|
|
|
/* make sure we wake any epoll edge trigger waiter */
|
|
if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && err == -EAGAIN))
|
|
sk->sk_write_space(sk);
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static struct sk_buff *kcm_wait_data(struct sock *sk, int flags,
|
|
long timeo, int *err)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while (!(skb = skb_peek(&sk->sk_receive_queue))) {
|
|
if (sk->sk_err) {
|
|
*err = sock_error(sk);
|
|
return NULL;
|
|
}
|
|
|
|
if (sock_flag(sk, SOCK_DONE))
|
|
return NULL;
|
|
|
|
if ((flags & MSG_DONTWAIT) || !timeo) {
|
|
*err = -EAGAIN;
|
|
return NULL;
|
|
}
|
|
|
|
sk_wait_data(sk, &timeo, NULL);
|
|
|
|
/* Handle signals */
|
|
if (signal_pending(current)) {
|
|
*err = sock_intr_errno(timeo);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
static int kcm_recvmsg(struct socket *sock, struct msghdr *msg,
|
|
size_t len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct kcm_sock *kcm = kcm_sk(sk);
|
|
int err = 0;
|
|
long timeo;
|
|
struct strp_msg *stm;
|
|
int copied = 0;
|
|
struct sk_buff *skb;
|
|
|
|
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
|
|
lock_sock(sk);
|
|
|
|
skb = kcm_wait_data(sk, flags, timeo, &err);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
/* Okay, have a message on the receive queue */
|
|
|
|
stm = strp_msg(skb);
|
|
|
|
if (len > stm->full_len)
|
|
len = stm->full_len;
|
|
|
|
err = skb_copy_datagram_msg(skb, stm->offset, msg, len);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
copied = len;
|
|
if (likely(!(flags & MSG_PEEK))) {
|
|
KCM_STATS_ADD(kcm->stats.rx_bytes, copied);
|
|
if (copied < stm->full_len) {
|
|
if (sock->type == SOCK_DGRAM) {
|
|
/* Truncated message */
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
goto msg_finished;
|
|
}
|
|
stm->offset += copied;
|
|
stm->full_len -= copied;
|
|
} else {
|
|
msg_finished:
|
|
/* Finished with message */
|
|
msg->msg_flags |= MSG_EOR;
|
|
KCM_STATS_INCR(kcm->stats.rx_msgs);
|
|
skb_unlink(skb, &sk->sk_receive_queue);
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
out:
|
|
release_sock(sk);
|
|
|
|
return copied ? : err;
|
|
}
|
|
|
|
static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos,
|
|
struct pipe_inode_info *pipe, size_t len,
|
|
unsigned int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct kcm_sock *kcm = kcm_sk(sk);
|
|
long timeo;
|
|
struct strp_msg *stm;
|
|
int err = 0;
|
|
ssize_t copied;
|
|
struct sk_buff *skb;
|
|
|
|
/* Only support splice for SOCKSEQPACKET */
|
|
|
|
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
|
|
lock_sock(sk);
|
|
|
|
skb = kcm_wait_data(sk, flags, timeo, &err);
|
|
if (!skb)
|
|
goto err_out;
|
|
|
|
/* Okay, have a message on the receive queue */
|
|
|
|
stm = strp_msg(skb);
|
|
|
|
if (len > stm->full_len)
|
|
len = stm->full_len;
|
|
|
|
copied = skb_splice_bits(skb, sk, stm->offset, pipe, len, flags);
|
|
if (copied < 0) {
|
|
err = copied;
|
|
goto err_out;
|
|
}
|
|
|
|
KCM_STATS_ADD(kcm->stats.rx_bytes, copied);
|
|
|
|
stm->offset += copied;
|
|
stm->full_len -= copied;
|
|
|
|
/* We have no way to return MSG_EOR. If all the bytes have been
|
|
* read we still leave the message in the receive socket buffer.
|
|
* A subsequent recvmsg needs to be done to return MSG_EOR and
|
|
* finish reading the message.
|
|
*/
|
|
|
|
release_sock(sk);
|
|
|
|
return copied;
|
|
|
|
err_out:
|
|
release_sock(sk);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* kcm sock lock held */
|
|
static void kcm_recv_disable(struct kcm_sock *kcm)
|
|
{
|
|
struct kcm_mux *mux = kcm->mux;
|
|
|
|
if (kcm->rx_disabled)
|
|
return;
|
|
|
|
spin_lock_bh(&mux->rx_lock);
|
|
|
|
kcm->rx_disabled = 1;
|
|
|
|
/* If a psock is reserved we'll do cleanup in unreserve */
|
|
if (!kcm->rx_psock) {
|
|
if (kcm->rx_wait) {
|
|
list_del(&kcm->wait_rx_list);
|
|
kcm->rx_wait = false;
|
|
}
|
|
|
|
requeue_rx_msgs(mux, &kcm->sk.sk_receive_queue);
|
|
}
|
|
|
|
spin_unlock_bh(&mux->rx_lock);
|
|
}
|
|
|
|
/* kcm sock lock held */
|
|
static void kcm_recv_enable(struct kcm_sock *kcm)
|
|
{
|
|
struct kcm_mux *mux = kcm->mux;
|
|
|
|
if (!kcm->rx_disabled)
|
|
return;
|
|
|
|
spin_lock_bh(&mux->rx_lock);
|
|
|
|
kcm->rx_disabled = 0;
|
|
kcm_rcv_ready(kcm);
|
|
|
|
spin_unlock_bh(&mux->rx_lock);
|
|
}
|
|
|
|
static int kcm_setsockopt(struct socket *sock, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
struct kcm_sock *kcm = kcm_sk(sock->sk);
|
|
int val, valbool;
|
|
int err = 0;
|
|
|
|
if (level != SOL_KCM)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (optlen < sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&val, optval, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
valbool = val ? 1 : 0;
|
|
|
|
switch (optname) {
|
|
case KCM_RECV_DISABLE:
|
|
lock_sock(&kcm->sk);
|
|
if (valbool)
|
|
kcm_recv_disable(kcm);
|
|
else
|
|
kcm_recv_enable(kcm);
|
|
release_sock(&kcm->sk);
|
|
break;
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int kcm_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct kcm_sock *kcm = kcm_sk(sock->sk);
|
|
int val, len;
|
|
|
|
if (level != SOL_KCM)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
len = min_t(unsigned int, len, sizeof(int));
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case KCM_RECV_DISABLE:
|
|
val = kcm->rx_disabled;
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &val, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static void init_kcm_sock(struct kcm_sock *kcm, struct kcm_mux *mux)
|
|
{
|
|
struct kcm_sock *tkcm;
|
|
struct list_head *head;
|
|
int index = 0;
|
|
|
|
/* For SOCK_SEQPACKET sock type, datagram_poll checks the sk_state, so
|
|
* we set sk_state, otherwise epoll_wait always returns right away with
|
|
* EPOLLHUP
|
|
*/
|
|
kcm->sk.sk_state = TCP_ESTABLISHED;
|
|
|
|
/* Add to mux's kcm sockets list */
|
|
kcm->mux = mux;
|
|
spin_lock_bh(&mux->lock);
|
|
|
|
head = &mux->kcm_socks;
|
|
list_for_each_entry(tkcm, &mux->kcm_socks, kcm_sock_list) {
|
|
if (tkcm->index != index)
|
|
break;
|
|
head = &tkcm->kcm_sock_list;
|
|
index++;
|
|
}
|
|
|
|
list_add(&kcm->kcm_sock_list, head);
|
|
kcm->index = index;
|
|
|
|
mux->kcm_socks_cnt++;
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
INIT_WORK(&kcm->tx_work, kcm_tx_work);
|
|
|
|
spin_lock_bh(&mux->rx_lock);
|
|
kcm_rcv_ready(kcm);
|
|
spin_unlock_bh(&mux->rx_lock);
|
|
}
|
|
|
|
static int kcm_attach(struct socket *sock, struct socket *csock,
|
|
struct bpf_prog *prog)
|
|
{
|
|
struct kcm_sock *kcm = kcm_sk(sock->sk);
|
|
struct kcm_mux *mux = kcm->mux;
|
|
struct sock *csk;
|
|
struct kcm_psock *psock = NULL, *tpsock;
|
|
struct list_head *head;
|
|
int index = 0;
|
|
static const struct strp_callbacks cb = {
|
|
.rcv_msg = kcm_rcv_strparser,
|
|
.parse_msg = kcm_parse_func_strparser,
|
|
.read_sock_done = kcm_read_sock_done,
|
|
};
|
|
int err = 0;
|
|
|
|
csk = csock->sk;
|
|
if (!csk)
|
|
return -EINVAL;
|
|
|
|
lock_sock(csk);
|
|
|
|
/* Only allow TCP sockets to be attached for now */
|
|
if ((csk->sk_family != AF_INET && csk->sk_family != AF_INET6) ||
|
|
csk->sk_protocol != IPPROTO_TCP) {
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
/* Don't allow listeners or closed sockets */
|
|
if (csk->sk_state == TCP_LISTEN || csk->sk_state == TCP_CLOSE) {
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
psock = kmem_cache_zalloc(kcm_psockp, GFP_KERNEL);
|
|
if (!psock) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
psock->mux = mux;
|
|
psock->sk = csk;
|
|
psock->bpf_prog = prog;
|
|
|
|
err = strp_init(&psock->strp, csk, &cb);
|
|
if (err) {
|
|
kmem_cache_free(kcm_psockp, psock);
|
|
goto out;
|
|
}
|
|
|
|
write_lock_bh(&csk->sk_callback_lock);
|
|
|
|
/* Check if sk_user_data is already by KCM or someone else.
|
|
* Must be done under lock to prevent race conditions.
|
|
*/
|
|
if (csk->sk_user_data) {
|
|
write_unlock_bh(&csk->sk_callback_lock);
|
|
strp_stop(&psock->strp);
|
|
strp_done(&psock->strp);
|
|
kmem_cache_free(kcm_psockp, psock);
|
|
err = -EALREADY;
|
|
goto out;
|
|
}
|
|
|
|
psock->save_data_ready = csk->sk_data_ready;
|
|
psock->save_write_space = csk->sk_write_space;
|
|
psock->save_state_change = csk->sk_state_change;
|
|
csk->sk_user_data = psock;
|
|
csk->sk_data_ready = psock_data_ready;
|
|
csk->sk_write_space = psock_write_space;
|
|
csk->sk_state_change = psock_state_change;
|
|
|
|
write_unlock_bh(&csk->sk_callback_lock);
|
|
|
|
sock_hold(csk);
|
|
|
|
/* Finished initialization, now add the psock to the MUX. */
|
|
spin_lock_bh(&mux->lock);
|
|
head = &mux->psocks;
|
|
list_for_each_entry(tpsock, &mux->psocks, psock_list) {
|
|
if (tpsock->index != index)
|
|
break;
|
|
head = &tpsock->psock_list;
|
|
index++;
|
|
}
|
|
|
|
list_add(&psock->psock_list, head);
|
|
psock->index = index;
|
|
|
|
KCM_STATS_INCR(mux->stats.psock_attach);
|
|
mux->psocks_cnt++;
|
|
psock_now_avail(psock);
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
/* Schedule RX work in case there are already bytes queued */
|
|
strp_check_rcv(&psock->strp);
|
|
|
|
out:
|
|
release_sock(csk);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int kcm_attach_ioctl(struct socket *sock, struct kcm_attach *info)
|
|
{
|
|
struct socket *csock;
|
|
struct bpf_prog *prog;
|
|
int err;
|
|
|
|
csock = sockfd_lookup(info->fd, &err);
|
|
if (!csock)
|
|
return -ENOENT;
|
|
|
|
prog = bpf_prog_get_type(info->bpf_fd, BPF_PROG_TYPE_SOCKET_FILTER);
|
|
if (IS_ERR(prog)) {
|
|
err = PTR_ERR(prog);
|
|
goto out;
|
|
}
|
|
|
|
err = kcm_attach(sock, csock, prog);
|
|
if (err) {
|
|
bpf_prog_put(prog);
|
|
goto out;
|
|
}
|
|
|
|
/* Keep reference on file also */
|
|
|
|
return 0;
|
|
out:
|
|
sockfd_put(csock);
|
|
return err;
|
|
}
|
|
|
|
static void kcm_unattach(struct kcm_psock *psock)
|
|
{
|
|
struct sock *csk = psock->sk;
|
|
struct kcm_mux *mux = psock->mux;
|
|
|
|
lock_sock(csk);
|
|
|
|
/* Stop getting callbacks from TCP socket. After this there should
|
|
* be no way to reserve a kcm for this psock.
|
|
*/
|
|
write_lock_bh(&csk->sk_callback_lock);
|
|
csk->sk_user_data = NULL;
|
|
csk->sk_data_ready = psock->save_data_ready;
|
|
csk->sk_write_space = psock->save_write_space;
|
|
csk->sk_state_change = psock->save_state_change;
|
|
strp_stop(&psock->strp);
|
|
|
|
if (WARN_ON(psock->rx_kcm)) {
|
|
write_unlock_bh(&csk->sk_callback_lock);
|
|
release_sock(csk);
|
|
return;
|
|
}
|
|
|
|
spin_lock_bh(&mux->rx_lock);
|
|
|
|
/* Stop receiver activities. After this point psock should not be
|
|
* able to get onto ready list either through callbacks or work.
|
|
*/
|
|
if (psock->ready_rx_msg) {
|
|
list_del(&psock->psock_ready_list);
|
|
kfree_skb(psock->ready_rx_msg);
|
|
psock->ready_rx_msg = NULL;
|
|
KCM_STATS_INCR(mux->stats.rx_ready_drops);
|
|
}
|
|
|
|
spin_unlock_bh(&mux->rx_lock);
|
|
|
|
write_unlock_bh(&csk->sk_callback_lock);
|
|
|
|
/* Call strp_done without sock lock */
|
|
release_sock(csk);
|
|
strp_done(&psock->strp);
|
|
lock_sock(csk);
|
|
|
|
bpf_prog_put(psock->bpf_prog);
|
|
|
|
spin_lock_bh(&mux->lock);
|
|
|
|
aggregate_psock_stats(&psock->stats, &mux->aggregate_psock_stats);
|
|
save_strp_stats(&psock->strp, &mux->aggregate_strp_stats);
|
|
|
|
KCM_STATS_INCR(mux->stats.psock_unattach);
|
|
|
|
if (psock->tx_kcm) {
|
|
/* psock was reserved. Just mark it finished and we will clean
|
|
* up in the kcm paths, we need kcm lock which can not be
|
|
* acquired here.
|
|
*/
|
|
KCM_STATS_INCR(mux->stats.psock_unattach_rsvd);
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
/* We are unattaching a socket that is reserved. Abort the
|
|
* socket since we may be out of sync in sending on it. We need
|
|
* to do this without the mux lock.
|
|
*/
|
|
kcm_abort_tx_psock(psock, EPIPE, false);
|
|
|
|
spin_lock_bh(&mux->lock);
|
|
if (!psock->tx_kcm) {
|
|
/* psock now unreserved in window mux was unlocked */
|
|
goto no_reserved;
|
|
}
|
|
psock->done = 1;
|
|
|
|
/* Commit done before queuing work to process it */
|
|
smp_mb();
|
|
|
|
/* Queue tx work to make sure psock->done is handled */
|
|
queue_work(kcm_wq, &psock->tx_kcm->tx_work);
|
|
spin_unlock_bh(&mux->lock);
|
|
} else {
|
|
no_reserved:
|
|
if (!psock->tx_stopped)
|
|
list_del(&psock->psock_avail_list);
|
|
list_del(&psock->psock_list);
|
|
mux->psocks_cnt--;
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
sock_put(csk);
|
|
fput(csk->sk_socket->file);
|
|
kmem_cache_free(kcm_psockp, psock);
|
|
}
|
|
|
|
release_sock(csk);
|
|
}
|
|
|
|
static int kcm_unattach_ioctl(struct socket *sock, struct kcm_unattach *info)
|
|
{
|
|
struct kcm_sock *kcm = kcm_sk(sock->sk);
|
|
struct kcm_mux *mux = kcm->mux;
|
|
struct kcm_psock *psock;
|
|
struct socket *csock;
|
|
struct sock *csk;
|
|
int err;
|
|
|
|
csock = sockfd_lookup(info->fd, &err);
|
|
if (!csock)
|
|
return -ENOENT;
|
|
|
|
csk = csock->sk;
|
|
if (!csk) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = -ENOENT;
|
|
|
|
spin_lock_bh(&mux->lock);
|
|
|
|
list_for_each_entry(psock, &mux->psocks, psock_list) {
|
|
if (psock->sk != csk)
|
|
continue;
|
|
|
|
/* Found the matching psock */
|
|
|
|
if (psock->unattaching || WARN_ON(psock->done)) {
|
|
err = -EALREADY;
|
|
break;
|
|
}
|
|
|
|
psock->unattaching = 1;
|
|
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
/* Lower socket lock should already be held */
|
|
kcm_unattach(psock);
|
|
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
out:
|
|
sockfd_put(csock);
|
|
return err;
|
|
}
|
|
|
|
static struct proto kcm_proto = {
|
|
.name = "KCM",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct kcm_sock),
|
|
};
|
|
|
|
/* Clone a kcm socket. */
|
|
static struct file *kcm_clone(struct socket *osock)
|
|
{
|
|
struct socket *newsock;
|
|
struct sock *newsk;
|
|
|
|
newsock = sock_alloc();
|
|
if (!newsock)
|
|
return ERR_PTR(-ENFILE);
|
|
|
|
newsock->type = osock->type;
|
|
newsock->ops = osock->ops;
|
|
|
|
__module_get(newsock->ops->owner);
|
|
|
|
newsk = sk_alloc(sock_net(osock->sk), PF_KCM, GFP_KERNEL,
|
|
&kcm_proto, false);
|
|
if (!newsk) {
|
|
sock_release(newsock);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
sock_init_data(newsock, newsk);
|
|
init_kcm_sock(kcm_sk(newsk), kcm_sk(osock->sk)->mux);
|
|
|
|
return sock_alloc_file(newsock, 0, osock->sk->sk_prot_creator->name);
|
|
}
|
|
|
|
static int kcm_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
int err;
|
|
|
|
switch (cmd) {
|
|
case SIOCKCMATTACH: {
|
|
struct kcm_attach info;
|
|
|
|
if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
err = kcm_attach_ioctl(sock, &info);
|
|
|
|
break;
|
|
}
|
|
case SIOCKCMUNATTACH: {
|
|
struct kcm_unattach info;
|
|
|
|
if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
err = kcm_unattach_ioctl(sock, &info);
|
|
|
|
break;
|
|
}
|
|
case SIOCKCMCLONE: {
|
|
struct kcm_clone info;
|
|
struct file *file;
|
|
|
|
info.fd = get_unused_fd_flags(0);
|
|
if (unlikely(info.fd < 0))
|
|
return info.fd;
|
|
|
|
file = kcm_clone(sock);
|
|
if (IS_ERR(file)) {
|
|
put_unused_fd(info.fd);
|
|
return PTR_ERR(file);
|
|
}
|
|
if (copy_to_user((void __user *)arg, &info,
|
|
sizeof(info))) {
|
|
put_unused_fd(info.fd);
|
|
fput(file);
|
|
return -EFAULT;
|
|
}
|
|
fd_install(info.fd, file);
|
|
err = 0;
|
|
break;
|
|
}
|
|
default:
|
|
err = -ENOIOCTLCMD;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void free_mux(struct rcu_head *rcu)
|
|
{
|
|
struct kcm_mux *mux = container_of(rcu,
|
|
struct kcm_mux, rcu);
|
|
|
|
kmem_cache_free(kcm_muxp, mux);
|
|
}
|
|
|
|
static void release_mux(struct kcm_mux *mux)
|
|
{
|
|
struct kcm_net *knet = mux->knet;
|
|
struct kcm_psock *psock, *tmp_psock;
|
|
|
|
/* Release psocks */
|
|
list_for_each_entry_safe(psock, tmp_psock,
|
|
&mux->psocks, psock_list) {
|
|
if (!WARN_ON(psock->unattaching))
|
|
kcm_unattach(psock);
|
|
}
|
|
|
|
if (WARN_ON(mux->psocks_cnt))
|
|
return;
|
|
|
|
__skb_queue_purge(&mux->rx_hold_queue);
|
|
|
|
mutex_lock(&knet->mutex);
|
|
aggregate_mux_stats(&mux->stats, &knet->aggregate_mux_stats);
|
|
aggregate_psock_stats(&mux->aggregate_psock_stats,
|
|
&knet->aggregate_psock_stats);
|
|
aggregate_strp_stats(&mux->aggregate_strp_stats,
|
|
&knet->aggregate_strp_stats);
|
|
list_del_rcu(&mux->kcm_mux_list);
|
|
knet->count--;
|
|
mutex_unlock(&knet->mutex);
|
|
|
|
call_rcu(&mux->rcu, free_mux);
|
|
}
|
|
|
|
static void kcm_done(struct kcm_sock *kcm)
|
|
{
|
|
struct kcm_mux *mux = kcm->mux;
|
|
struct sock *sk = &kcm->sk;
|
|
int socks_cnt;
|
|
|
|
spin_lock_bh(&mux->rx_lock);
|
|
if (kcm->rx_psock) {
|
|
/* Cleanup in unreserve_rx_kcm */
|
|
WARN_ON(kcm->done);
|
|
kcm->rx_disabled = 1;
|
|
kcm->done = 1;
|
|
spin_unlock_bh(&mux->rx_lock);
|
|
return;
|
|
}
|
|
|
|
if (kcm->rx_wait) {
|
|
list_del(&kcm->wait_rx_list);
|
|
kcm->rx_wait = false;
|
|
}
|
|
/* Move any pending receive messages to other kcm sockets */
|
|
requeue_rx_msgs(mux, &sk->sk_receive_queue);
|
|
|
|
spin_unlock_bh(&mux->rx_lock);
|
|
|
|
if (WARN_ON(sk_rmem_alloc_get(sk)))
|
|
return;
|
|
|
|
/* Detach from MUX */
|
|
spin_lock_bh(&mux->lock);
|
|
|
|
list_del(&kcm->kcm_sock_list);
|
|
mux->kcm_socks_cnt--;
|
|
socks_cnt = mux->kcm_socks_cnt;
|
|
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
if (!socks_cnt) {
|
|
/* We are done with the mux now. */
|
|
release_mux(mux);
|
|
}
|
|
|
|
WARN_ON(kcm->rx_wait);
|
|
|
|
sock_put(&kcm->sk);
|
|
}
|
|
|
|
/* Called by kcm_release to close a KCM socket.
|
|
* If this is the last KCM socket on the MUX, destroy the MUX.
|
|
*/
|
|
static int kcm_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct kcm_sock *kcm;
|
|
struct kcm_mux *mux;
|
|
struct kcm_psock *psock;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
kcm = kcm_sk(sk);
|
|
mux = kcm->mux;
|
|
|
|
sock_orphan(sk);
|
|
kfree_skb(kcm->seq_skb);
|
|
|
|
lock_sock(sk);
|
|
/* Purge queue under lock to avoid race condition with tx_work trying
|
|
* to act when queue is nonempty. If tx_work runs after this point
|
|
* it will just return.
|
|
*/
|
|
__skb_queue_purge(&sk->sk_write_queue);
|
|
|
|
/* Set tx_stopped. This is checked when psock is bound to a kcm and we
|
|
* get a writespace callback. This prevents further work being queued
|
|
* from the callback (unbinding the psock occurs after canceling work.
|
|
*/
|
|
kcm->tx_stopped = 1;
|
|
|
|
release_sock(sk);
|
|
|
|
spin_lock_bh(&mux->lock);
|
|
if (kcm->tx_wait) {
|
|
/* Take of tx_wait list, after this point there should be no way
|
|
* that a psock will be assigned to this kcm.
|
|
*/
|
|
list_del(&kcm->wait_psock_list);
|
|
kcm->tx_wait = false;
|
|
}
|
|
spin_unlock_bh(&mux->lock);
|
|
|
|
/* Cancel work. After this point there should be no outside references
|
|
* to the kcm socket.
|
|
*/
|
|
cancel_work_sync(&kcm->tx_work);
|
|
|
|
lock_sock(sk);
|
|
psock = kcm->tx_psock;
|
|
if (psock) {
|
|
/* A psock was reserved, so we need to kill it since it
|
|
* may already have some bytes queued from a message. We
|
|
* need to do this after removing kcm from tx_wait list.
|
|
*/
|
|
kcm_abort_tx_psock(psock, EPIPE, false);
|
|
unreserve_psock(kcm);
|
|
}
|
|
release_sock(sk);
|
|
|
|
WARN_ON(kcm->tx_wait);
|
|
WARN_ON(kcm->tx_psock);
|
|
|
|
sock->sk = NULL;
|
|
|
|
kcm_done(kcm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct proto_ops kcm_dgram_ops = {
|
|
.family = PF_KCM,
|
|
.owner = THIS_MODULE,
|
|
.release = kcm_release,
|
|
.bind = sock_no_bind,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = sock_no_getname,
|
|
.poll = datagram_poll,
|
|
.ioctl = kcm_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = kcm_setsockopt,
|
|
.getsockopt = kcm_getsockopt,
|
|
.sendmsg = kcm_sendmsg,
|
|
.recvmsg = kcm_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = kcm_sendpage,
|
|
};
|
|
|
|
static const struct proto_ops kcm_seqpacket_ops = {
|
|
.family = PF_KCM,
|
|
.owner = THIS_MODULE,
|
|
.release = kcm_release,
|
|
.bind = sock_no_bind,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = sock_no_getname,
|
|
.poll = datagram_poll,
|
|
.ioctl = kcm_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = kcm_setsockopt,
|
|
.getsockopt = kcm_getsockopt,
|
|
.sendmsg = kcm_sendmsg,
|
|
.recvmsg = kcm_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = kcm_sendpage,
|
|
.splice_read = kcm_splice_read,
|
|
};
|
|
|
|
/* Create proto operation for kcm sockets */
|
|
static int kcm_create(struct net *net, struct socket *sock,
|
|
int protocol, int kern)
|
|
{
|
|
struct kcm_net *knet = net_generic(net, kcm_net_id);
|
|
struct sock *sk;
|
|
struct kcm_mux *mux;
|
|
|
|
switch (sock->type) {
|
|
case SOCK_DGRAM:
|
|
sock->ops = &kcm_dgram_ops;
|
|
break;
|
|
case SOCK_SEQPACKET:
|
|
sock->ops = &kcm_seqpacket_ops;
|
|
break;
|
|
default:
|
|
return -ESOCKTNOSUPPORT;
|
|
}
|
|
|
|
if (protocol != KCMPROTO_CONNECTED)
|
|
return -EPROTONOSUPPORT;
|
|
|
|
sk = sk_alloc(net, PF_KCM, GFP_KERNEL, &kcm_proto, kern);
|
|
if (!sk)
|
|
return -ENOMEM;
|
|
|
|
/* Allocate a kcm mux, shared between KCM sockets */
|
|
mux = kmem_cache_zalloc(kcm_muxp, GFP_KERNEL);
|
|
if (!mux) {
|
|
sk_free(sk);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock_init(&mux->lock);
|
|
spin_lock_init(&mux->rx_lock);
|
|
INIT_LIST_HEAD(&mux->kcm_socks);
|
|
INIT_LIST_HEAD(&mux->kcm_rx_waiters);
|
|
INIT_LIST_HEAD(&mux->kcm_tx_waiters);
|
|
|
|
INIT_LIST_HEAD(&mux->psocks);
|
|
INIT_LIST_HEAD(&mux->psocks_ready);
|
|
INIT_LIST_HEAD(&mux->psocks_avail);
|
|
|
|
mux->knet = knet;
|
|
|
|
/* Add new MUX to list */
|
|
mutex_lock(&knet->mutex);
|
|
list_add_rcu(&mux->kcm_mux_list, &knet->mux_list);
|
|
knet->count++;
|
|
mutex_unlock(&knet->mutex);
|
|
|
|
skb_queue_head_init(&mux->rx_hold_queue);
|
|
|
|
/* Init KCM socket */
|
|
sock_init_data(sock, sk);
|
|
init_kcm_sock(kcm_sk(sk), mux);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_proto_family kcm_family_ops = {
|
|
.family = PF_KCM,
|
|
.create = kcm_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static __net_init int kcm_init_net(struct net *net)
|
|
{
|
|
struct kcm_net *knet = net_generic(net, kcm_net_id);
|
|
|
|
INIT_LIST_HEAD_RCU(&knet->mux_list);
|
|
mutex_init(&knet->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __net_exit void kcm_exit_net(struct net *net)
|
|
{
|
|
struct kcm_net *knet = net_generic(net, kcm_net_id);
|
|
|
|
/* All KCM sockets should be closed at this point, which should mean
|
|
* that all multiplexors and psocks have been destroyed.
|
|
*/
|
|
WARN_ON(!list_empty(&knet->mux_list));
|
|
}
|
|
|
|
static struct pernet_operations kcm_net_ops = {
|
|
.init = kcm_init_net,
|
|
.exit = kcm_exit_net,
|
|
.id = &kcm_net_id,
|
|
.size = sizeof(struct kcm_net),
|
|
};
|
|
|
|
static int __init kcm_init(void)
|
|
{
|
|
int err = -ENOMEM;
|
|
|
|
kcm_muxp = kmem_cache_create("kcm_mux_cache",
|
|
sizeof(struct kcm_mux), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!kcm_muxp)
|
|
goto fail;
|
|
|
|
kcm_psockp = kmem_cache_create("kcm_psock_cache",
|
|
sizeof(struct kcm_psock), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!kcm_psockp)
|
|
goto fail;
|
|
|
|
kcm_wq = create_singlethread_workqueue("kkcmd");
|
|
if (!kcm_wq)
|
|
goto fail;
|
|
|
|
err = proto_register(&kcm_proto, 1);
|
|
if (err)
|
|
goto fail;
|
|
|
|
err = register_pernet_device(&kcm_net_ops);
|
|
if (err)
|
|
goto net_ops_fail;
|
|
|
|
err = sock_register(&kcm_family_ops);
|
|
if (err)
|
|
goto sock_register_fail;
|
|
|
|
err = kcm_proc_init();
|
|
if (err)
|
|
goto proc_init_fail;
|
|
|
|
return 0;
|
|
|
|
proc_init_fail:
|
|
sock_unregister(PF_KCM);
|
|
|
|
sock_register_fail:
|
|
unregister_pernet_device(&kcm_net_ops);
|
|
|
|
net_ops_fail:
|
|
proto_unregister(&kcm_proto);
|
|
|
|
fail:
|
|
kmem_cache_destroy(kcm_muxp);
|
|
kmem_cache_destroy(kcm_psockp);
|
|
|
|
if (kcm_wq)
|
|
destroy_workqueue(kcm_wq);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit kcm_exit(void)
|
|
{
|
|
kcm_proc_exit();
|
|
sock_unregister(PF_KCM);
|
|
unregister_pernet_device(&kcm_net_ops);
|
|
proto_unregister(&kcm_proto);
|
|
destroy_workqueue(kcm_wq);
|
|
|
|
kmem_cache_destroy(kcm_muxp);
|
|
kmem_cache_destroy(kcm_psockp);
|
|
}
|
|
|
|
module_init(kcm_init);
|
|
module_exit(kcm_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NETPROTO(PF_KCM);
|