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dcfea72e79
As part of the continual effort to remove direct usage of skb->next and
skb->prev, this patch adds a helper for iterating through the
singly-linked variant of skb lists, which are used for lists of GSO
packet. The name "skb_list_..." has been chosen to match the existing
function, "kfree_skb_list, which also operates on these singly-linked
lists, and the "..._walk_safe" part is the same idiom as elsewhere in
the kernel.
This patch removes the helper from wireguard and puts it into
linux/skbuff.h, while making it a bit more robust for general usage. In
particular, parenthesis are added around the macro argument usage, and it
now accounts for trying to iterate through an already-null skb pointer,
which will simply run the iteration zero times. This latter enhancement
means it can be used to replace both do { ... } while and while (...)
open-coded idioms.
This should take care of these three possible usages, which match all
current methods of iterations.
skb_list_walk_safe(segs, skb, next) { ... }
skb_list_walk_safe(skb, skb, next) { ... }
skb_list_walk_safe(segs, skb, segs) { ... }
Gcc appears to generate efficient code for each of these.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#ifndef _WG_DEVICE_H
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#define _WG_DEVICE_H
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#include "noise.h"
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#include "allowedips.h"
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#include "peerlookup.h"
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#include "cookie.h"
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#include <linux/types.h>
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#include <linux/netdevice.h>
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#include <linux/workqueue.h>
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#include <linux/mutex.h>
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#include <linux/net.h>
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#include <linux/ptr_ring.h>
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struct wg_device;
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struct multicore_worker {
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void *ptr;
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struct work_struct work;
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};
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struct crypt_queue {
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struct ptr_ring ring;
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union {
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struct {
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struct multicore_worker __percpu *worker;
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int last_cpu;
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};
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struct work_struct work;
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};
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};
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struct wg_device {
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struct net_device *dev;
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struct crypt_queue encrypt_queue, decrypt_queue;
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struct sock __rcu *sock4, *sock6;
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struct net *creating_net;
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struct noise_static_identity static_identity;
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struct workqueue_struct *handshake_receive_wq, *handshake_send_wq;
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struct workqueue_struct *packet_crypt_wq;
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struct sk_buff_head incoming_handshakes;
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int incoming_handshake_cpu;
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struct multicore_worker __percpu *incoming_handshakes_worker;
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struct cookie_checker cookie_checker;
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struct pubkey_hashtable *peer_hashtable;
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struct index_hashtable *index_hashtable;
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struct allowedips peer_allowedips;
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struct mutex device_update_lock, socket_update_lock;
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struct list_head device_list, peer_list;
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unsigned int num_peers, device_update_gen;
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u32 fwmark;
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u16 incoming_port;
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bool have_creating_net_ref;
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};
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int wg_device_init(void);
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void wg_device_uninit(void);
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#endif /* _WG_DEVICE_H */
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