![Al Viro](/assets/img/avatar_default.png)
- added typedef unsigned int __nocast gfp_t; - replaced __nocast uses for gfp flags with gfp_t - it gives exactly the same warnings as far as sparse is concerned, doesn't change generated code (from gcc point of view we replaced unsigned int with typedef) and documents what's going on far better. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1310 lines
35 KiB
C
1310 lines
35 KiB
C
/*
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* Definitions for the 'struct sk_buff' memory handlers.
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*
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* Authors:
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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* Florian La Roche, <rzsfl@rz.uni-sb.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_SKBUFF_H
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#define _LINUX_SKBUFF_H
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/compiler.h>
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#include <linux/time.h>
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#include <linux/cache.h>
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#include <asm/atomic.h>
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#include <asm/types.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/poll.h>
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#include <linux/net.h>
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#include <linux/textsearch.h>
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#include <net/checksum.h>
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#define HAVE_ALLOC_SKB /* For the drivers to know */
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#define HAVE_ALIGNABLE_SKB /* Ditto 8) */
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#define SLAB_SKB /* Slabified skbuffs */
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#define CHECKSUM_NONE 0
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#define CHECKSUM_HW 1
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#define CHECKSUM_UNNECESSARY 2
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#define SKB_DATA_ALIGN(X) (((X) + (SMP_CACHE_BYTES - 1)) & \
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~(SMP_CACHE_BYTES - 1))
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#define SKB_MAX_ORDER(X, ORDER) (((PAGE_SIZE << (ORDER)) - (X) - \
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sizeof(struct skb_shared_info)) & \
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~(SMP_CACHE_BYTES - 1))
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#define SKB_MAX_HEAD(X) (SKB_MAX_ORDER((X), 0))
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#define SKB_MAX_ALLOC (SKB_MAX_ORDER(0, 2))
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/* A. Checksumming of received packets by device.
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*
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* NONE: device failed to checksum this packet.
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* skb->csum is undefined.
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*
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* UNNECESSARY: device parsed packet and wouldbe verified checksum.
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* skb->csum is undefined.
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* It is bad option, but, unfortunately, many of vendors do this.
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* Apparently with secret goal to sell you new device, when you
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* will add new protocol to your host. F.e. IPv6. 8)
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*
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* HW: the most generic way. Device supplied checksum of _all_
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* the packet as seen by netif_rx in skb->csum.
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* NOTE: Even if device supports only some protocols, but
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* is able to produce some skb->csum, it MUST use HW,
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* not UNNECESSARY.
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*
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* B. Checksumming on output.
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*
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* NONE: skb is checksummed by protocol or csum is not required.
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*
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* HW: device is required to csum packet as seen by hard_start_xmit
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* from skb->h.raw to the end and to record the checksum
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* at skb->h.raw+skb->csum.
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*
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* Device must show its capabilities in dev->features, set
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* at device setup time.
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* NETIF_F_HW_CSUM - it is clever device, it is able to checksum
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* everything.
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* NETIF_F_NO_CSUM - loopback or reliable single hop media.
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* NETIF_F_IP_CSUM - device is dumb. It is able to csum only
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* TCP/UDP over IPv4. Sigh. Vendors like this
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* way by an unknown reason. Though, see comment above
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* about CHECKSUM_UNNECESSARY. 8)
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*
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* Any questions? No questions, good. --ANK
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*/
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struct net_device;
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#ifdef CONFIG_NETFILTER
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struct nf_conntrack {
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atomic_t use;
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void (*destroy)(struct nf_conntrack *);
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};
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#ifdef CONFIG_BRIDGE_NETFILTER
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struct nf_bridge_info {
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atomic_t use;
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struct net_device *physindev;
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struct net_device *physoutdev;
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#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
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struct net_device *netoutdev;
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#endif
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unsigned int mask;
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unsigned long data[32 / sizeof(unsigned long)];
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};
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#endif
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#endif
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struct sk_buff_head {
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/* These two members must be first. */
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struct sk_buff *next;
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struct sk_buff *prev;
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__u32 qlen;
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spinlock_t lock;
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};
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struct sk_buff;
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/* To allow 64K frame to be packed as single skb without frag_list */
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#define MAX_SKB_FRAGS (65536/PAGE_SIZE + 2)
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typedef struct skb_frag_struct skb_frag_t;
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struct skb_frag_struct {
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struct page *page;
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__u16 page_offset;
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__u16 size;
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};
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/* This data is invariant across clones and lives at
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* the end of the header data, ie. at skb->end.
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*/
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struct skb_shared_info {
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atomic_t dataref;
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unsigned int nr_frags;
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unsigned short tso_size;
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unsigned short tso_segs;
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struct sk_buff *frag_list;
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skb_frag_t frags[MAX_SKB_FRAGS];
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};
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/* We divide dataref into two halves. The higher 16 bits hold references
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* to the payload part of skb->data. The lower 16 bits hold references to
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* the entire skb->data. It is up to the users of the skb to agree on
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* where the payload starts.
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*
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* All users must obey the rule that the skb->data reference count must be
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* greater than or equal to the payload reference count.
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*
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* Holding a reference to the payload part means that the user does not
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* care about modifications to the header part of skb->data.
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*/
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#define SKB_DATAREF_SHIFT 16
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#define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1)
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struct skb_timeval {
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u32 off_sec;
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u32 off_usec;
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};
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enum {
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SKB_FCLONE_UNAVAILABLE,
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SKB_FCLONE_ORIG,
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SKB_FCLONE_CLONE,
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};
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/**
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* struct sk_buff - socket buffer
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* @next: Next buffer in list
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* @prev: Previous buffer in list
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* @list: List we are on
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* @sk: Socket we are owned by
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* @tstamp: Time we arrived
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* @dev: Device we arrived on/are leaving by
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* @input_dev: Device we arrived on
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* @h: Transport layer header
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* @nh: Network layer header
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* @mac: Link layer header
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* @dst: destination entry
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* @sp: the security path, used for xfrm
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* @cb: Control buffer. Free for use by every layer. Put private vars here
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* @len: Length of actual data
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* @data_len: Data length
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* @mac_len: Length of link layer header
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* @csum: Checksum
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* @local_df: allow local fragmentation
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* @cloned: Head may be cloned (check refcnt to be sure)
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* @nohdr: Payload reference only, must not modify header
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* @pkt_type: Packet class
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* @ip_summed: Driver fed us an IP checksum
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* @priority: Packet queueing priority
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* @users: User count - see {datagram,tcp}.c
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* @protocol: Packet protocol from driver
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* @truesize: Buffer size
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* @head: Head of buffer
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* @data: Data head pointer
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* @tail: Tail pointer
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* @end: End pointer
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* @destructor: Destruct function
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* @nfmark: Can be used for communication between hooks
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* @nfct: Associated connection, if any
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* @nfctinfo: Relationship of this skb to the connection
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* @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
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* @tc_index: Traffic control index
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* @tc_verd: traffic control verdict
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*/
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struct sk_buff {
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/* These two members must be first. */
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struct sk_buff *next;
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struct sk_buff *prev;
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struct sock *sk;
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struct skb_timeval tstamp;
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struct net_device *dev;
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struct net_device *input_dev;
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union {
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struct tcphdr *th;
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struct udphdr *uh;
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struct icmphdr *icmph;
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struct igmphdr *igmph;
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struct iphdr *ipiph;
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struct ipv6hdr *ipv6h;
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unsigned char *raw;
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} h;
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union {
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struct iphdr *iph;
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struct ipv6hdr *ipv6h;
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struct arphdr *arph;
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unsigned char *raw;
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} nh;
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union {
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unsigned char *raw;
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} mac;
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struct dst_entry *dst;
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struct sec_path *sp;
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/*
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* This is the control buffer. It is free to use for every
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* layer. Please put your private variables there. If you
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* want to keep them across layers you have to do a skb_clone()
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* first. This is owned by whoever has the skb queued ATM.
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*/
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char cb[40];
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unsigned int len,
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data_len,
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mac_len,
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csum;
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__u32 priority;
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__u8 local_df:1,
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cloned:1,
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ip_summed:2,
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nohdr:1,
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nfctinfo:3;
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__u8 pkt_type:3,
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fclone:2;
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__be16 protocol;
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void (*destructor)(struct sk_buff *skb);
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#ifdef CONFIG_NETFILTER
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__u32 nfmark;
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struct nf_conntrack *nfct;
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#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
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__u8 ipvs_property:1;
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#endif
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#ifdef CONFIG_BRIDGE_NETFILTER
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struct nf_bridge_info *nf_bridge;
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#endif
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#endif /* CONFIG_NETFILTER */
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#ifdef CONFIG_NET_SCHED
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__u16 tc_index; /* traffic control index */
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#ifdef CONFIG_NET_CLS_ACT
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__u16 tc_verd; /* traffic control verdict */
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#endif
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#endif
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/* These elements must be at the end, see alloc_skb() for details. */
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unsigned int truesize;
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atomic_t users;
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unsigned char *head,
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*data,
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*tail,
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*end;
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};
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#ifdef __KERNEL__
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/*
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* Handling routines are only of interest to the kernel
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*/
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#include <linux/slab.h>
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#include <asm/system.h>
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extern void __kfree_skb(struct sk_buff *skb);
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extern struct sk_buff *__alloc_skb(unsigned int size,
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gfp_t priority, int fclone);
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static inline struct sk_buff *alloc_skb(unsigned int size,
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gfp_t priority)
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{
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return __alloc_skb(size, priority, 0);
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}
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static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
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gfp_t priority)
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{
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return __alloc_skb(size, priority, 1);
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}
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extern struct sk_buff *alloc_skb_from_cache(kmem_cache_t *cp,
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unsigned int size,
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gfp_t priority);
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extern void kfree_skbmem(struct sk_buff *skb);
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extern struct sk_buff *skb_clone(struct sk_buff *skb,
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gfp_t priority);
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extern struct sk_buff *skb_copy(const struct sk_buff *skb,
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gfp_t priority);
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extern struct sk_buff *pskb_copy(struct sk_buff *skb,
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gfp_t gfp_mask);
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extern int pskb_expand_head(struct sk_buff *skb,
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int nhead, int ntail,
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gfp_t gfp_mask);
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extern struct sk_buff *skb_realloc_headroom(struct sk_buff *skb,
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unsigned int headroom);
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extern struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
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int newheadroom, int newtailroom,
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gfp_t priority);
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extern struct sk_buff * skb_pad(struct sk_buff *skb, int pad);
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#define dev_kfree_skb(a) kfree_skb(a)
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extern void skb_over_panic(struct sk_buff *skb, int len,
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void *here);
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extern void skb_under_panic(struct sk_buff *skb, int len,
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void *here);
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struct skb_seq_state
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{
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__u32 lower_offset;
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__u32 upper_offset;
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__u32 frag_idx;
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__u32 stepped_offset;
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struct sk_buff *root_skb;
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struct sk_buff *cur_skb;
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__u8 *frag_data;
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};
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extern void skb_prepare_seq_read(struct sk_buff *skb,
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unsigned int from, unsigned int to,
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struct skb_seq_state *st);
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extern unsigned int skb_seq_read(unsigned int consumed, const u8 **data,
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struct skb_seq_state *st);
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extern void skb_abort_seq_read(struct skb_seq_state *st);
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extern unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
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unsigned int to, struct ts_config *config,
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struct ts_state *state);
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/* Internal */
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#define skb_shinfo(SKB) ((struct skb_shared_info *)((SKB)->end))
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/**
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* skb_queue_empty - check if a queue is empty
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* @list: queue head
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*
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* Returns true if the queue is empty, false otherwise.
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*/
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static inline int skb_queue_empty(const struct sk_buff_head *list)
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{
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return list->next == (struct sk_buff *)list;
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}
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/**
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* skb_get - reference buffer
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* @skb: buffer to reference
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*
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* Makes another reference to a socket buffer and returns a pointer
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* to the buffer.
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*/
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static inline struct sk_buff *skb_get(struct sk_buff *skb)
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{
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atomic_inc(&skb->users);
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return skb;
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}
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/*
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* If users == 1, we are the only owner and are can avoid redundant
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* atomic change.
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*/
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/**
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* kfree_skb - free an sk_buff
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* @skb: buffer to free
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*
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* Drop a reference to the buffer and free it if the usage count has
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* hit zero.
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*/
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static inline void kfree_skb(struct sk_buff *skb)
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{
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if (likely(atomic_read(&skb->users) == 1))
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smp_rmb();
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else if (likely(!atomic_dec_and_test(&skb->users)))
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return;
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__kfree_skb(skb);
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}
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/**
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* skb_cloned - is the buffer a clone
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* @skb: buffer to check
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*
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* Returns true if the buffer was generated with skb_clone() and is
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* one of multiple shared copies of the buffer. Cloned buffers are
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* shared data so must not be written to under normal circumstances.
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*/
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static inline int skb_cloned(const struct sk_buff *skb)
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{
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return skb->cloned &&
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(atomic_read(&skb_shinfo(skb)->dataref) & SKB_DATAREF_MASK) != 1;
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}
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/**
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* skb_header_cloned - is the header a clone
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* @skb: buffer to check
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*
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* Returns true if modifying the header part of the buffer requires
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* the data to be copied.
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*/
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static inline int skb_header_cloned(const struct sk_buff *skb)
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{
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int dataref;
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if (!skb->cloned)
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return 0;
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dataref = atomic_read(&skb_shinfo(skb)->dataref);
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dataref = (dataref & SKB_DATAREF_MASK) - (dataref >> SKB_DATAREF_SHIFT);
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return dataref != 1;
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}
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/**
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* skb_header_release - release reference to header
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* @skb: buffer to operate on
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*
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* Drop a reference to the header part of the buffer. This is done
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* by acquiring a payload reference. You must not read from the header
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* part of skb->data after this.
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*/
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static inline void skb_header_release(struct sk_buff *skb)
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{
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BUG_ON(skb->nohdr);
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skb->nohdr = 1;
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atomic_add(1 << SKB_DATAREF_SHIFT, &skb_shinfo(skb)->dataref);
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}
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/**
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* skb_shared - is the buffer shared
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* @skb: buffer to check
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*
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* Returns true if more than one person has a reference to this
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* buffer.
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*/
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static inline int skb_shared(const struct sk_buff *skb)
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{
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return atomic_read(&skb->users) != 1;
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}
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/**
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* skb_share_check - check if buffer is shared and if so clone it
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* @skb: buffer to check
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* @pri: priority for memory allocation
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*
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* If the buffer is shared the buffer is cloned and the old copy
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* drops a reference. A new clone with a single reference is returned.
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* If the buffer is not shared the original buffer is returned. When
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* being called from interrupt status or with spinlocks held pri must
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* be GFP_ATOMIC.
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*
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* NULL is returned on a memory allocation failure.
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*/
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static inline struct sk_buff *skb_share_check(struct sk_buff *skb,
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gfp_t pri)
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{
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might_sleep_if(pri & __GFP_WAIT);
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if (skb_shared(skb)) {
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struct sk_buff *nskb = skb_clone(skb, pri);
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kfree_skb(skb);
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skb = nskb;
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}
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return skb;
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}
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/*
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* Copy shared buffers into a new sk_buff. We effectively do COW on
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* packets to handle cases where we have a local reader and forward
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* and a couple of other messy ones. The normal one is tcpdumping
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* a packet thats being forwarded.
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*/
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/**
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* skb_unshare - make a copy of a shared buffer
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* @skb: buffer to check
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* @pri: priority for memory allocation
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*
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* If the socket buffer is a clone then this function creates a new
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* copy of the data, drops a reference count on the old copy and returns
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|
* the new copy with the reference count at 1. If the buffer is not a clone
|
|
* the original buffer is returned. When called with a spinlock held or
|
|
* from interrupt state @pri must be %GFP_ATOMIC
|
|
*
|
|
* %NULL is returned on a memory allocation failure.
|
|
*/
|
|
static inline struct sk_buff *skb_unshare(struct sk_buff *skb,
|
|
gfp_t pri)
|
|
{
|
|
might_sleep_if(pri & __GFP_WAIT);
|
|
if (skb_cloned(skb)) {
|
|
struct sk_buff *nskb = skb_copy(skb, pri);
|
|
kfree_skb(skb); /* Free our shared copy */
|
|
skb = nskb;
|
|
}
|
|
return skb;
|
|
}
|
|
|
|
/**
|
|
* skb_peek
|
|
* @list_: list to peek at
|
|
*
|
|
* Peek an &sk_buff. Unlike most other operations you _MUST_
|
|
* be careful with this one. A peek leaves the buffer on the
|
|
* list and someone else may run off with it. You must hold
|
|
* the appropriate locks or have a private queue to do this.
|
|
*
|
|
* Returns %NULL for an empty list or a pointer to the head element.
|
|
* The reference count is not incremented and the reference is therefore
|
|
* volatile. Use with caution.
|
|
*/
|
|
static inline struct sk_buff *skb_peek(struct sk_buff_head *list_)
|
|
{
|
|
struct sk_buff *list = ((struct sk_buff *)list_)->next;
|
|
if (list == (struct sk_buff *)list_)
|
|
list = NULL;
|
|
return list;
|
|
}
|
|
|
|
/**
|
|
* skb_peek_tail
|
|
* @list_: list to peek at
|
|
*
|
|
* Peek an &sk_buff. Unlike most other operations you _MUST_
|
|
* be careful with this one. A peek leaves the buffer on the
|
|
* list and someone else may run off with it. You must hold
|
|
* the appropriate locks or have a private queue to do this.
|
|
*
|
|
* Returns %NULL for an empty list or a pointer to the tail element.
|
|
* The reference count is not incremented and the reference is therefore
|
|
* volatile. Use with caution.
|
|
*/
|
|
static inline struct sk_buff *skb_peek_tail(struct sk_buff_head *list_)
|
|
{
|
|
struct sk_buff *list = ((struct sk_buff *)list_)->prev;
|
|
if (list == (struct sk_buff *)list_)
|
|
list = NULL;
|
|
return list;
|
|
}
|
|
|
|
/**
|
|
* skb_queue_len - get queue length
|
|
* @list_: list to measure
|
|
*
|
|
* Return the length of an &sk_buff queue.
|
|
*/
|
|
static inline __u32 skb_queue_len(const struct sk_buff_head *list_)
|
|
{
|
|
return list_->qlen;
|
|
}
|
|
|
|
static inline void skb_queue_head_init(struct sk_buff_head *list)
|
|
{
|
|
spin_lock_init(&list->lock);
|
|
list->prev = list->next = (struct sk_buff *)list;
|
|
list->qlen = 0;
|
|
}
|
|
|
|
/*
|
|
* Insert an sk_buff at the start of a list.
|
|
*
|
|
* The "__skb_xxxx()" functions are the non-atomic ones that
|
|
* can only be called with interrupts disabled.
|
|
*/
|
|
|
|
/**
|
|
* __skb_queue_head - queue a buffer at the list head
|
|
* @list: list to use
|
|
* @newsk: buffer to queue
|
|
*
|
|
* Queue a buffer at the start of a list. This function takes no locks
|
|
* and you must therefore hold required locks before calling it.
|
|
*
|
|
* A buffer cannot be placed on two lists at the same time.
|
|
*/
|
|
extern void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk);
|
|
static inline void __skb_queue_head(struct sk_buff_head *list,
|
|
struct sk_buff *newsk)
|
|
{
|
|
struct sk_buff *prev, *next;
|
|
|
|
list->qlen++;
|
|
prev = (struct sk_buff *)list;
|
|
next = prev->next;
|
|
newsk->next = next;
|
|
newsk->prev = prev;
|
|
next->prev = prev->next = newsk;
|
|
}
|
|
|
|
/**
|
|
* __skb_queue_tail - queue a buffer at the list tail
|
|
* @list: list to use
|
|
* @newsk: buffer to queue
|
|
*
|
|
* Queue a buffer at the end of a list. This function takes no locks
|
|
* and you must therefore hold required locks before calling it.
|
|
*
|
|
* A buffer cannot be placed on two lists at the same time.
|
|
*/
|
|
extern void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk);
|
|
static inline void __skb_queue_tail(struct sk_buff_head *list,
|
|
struct sk_buff *newsk)
|
|
{
|
|
struct sk_buff *prev, *next;
|
|
|
|
list->qlen++;
|
|
next = (struct sk_buff *)list;
|
|
prev = next->prev;
|
|
newsk->next = next;
|
|
newsk->prev = prev;
|
|
next->prev = prev->next = newsk;
|
|
}
|
|
|
|
|
|
/**
|
|
* __skb_dequeue - remove from the head of the queue
|
|
* @list: list to dequeue from
|
|
*
|
|
* Remove the head of the list. This function does not take any locks
|
|
* so must be used with appropriate locks held only. The head item is
|
|
* returned or %NULL if the list is empty.
|
|
*/
|
|
extern struct sk_buff *skb_dequeue(struct sk_buff_head *list);
|
|
static inline struct sk_buff *__skb_dequeue(struct sk_buff_head *list)
|
|
{
|
|
struct sk_buff *next, *prev, *result;
|
|
|
|
prev = (struct sk_buff *) list;
|
|
next = prev->next;
|
|
result = NULL;
|
|
if (next != prev) {
|
|
result = next;
|
|
next = next->next;
|
|
list->qlen--;
|
|
next->prev = prev;
|
|
prev->next = next;
|
|
result->next = result->prev = NULL;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/*
|
|
* Insert a packet on a list.
|
|
*/
|
|
extern void skb_insert(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list);
|
|
static inline void __skb_insert(struct sk_buff *newsk,
|
|
struct sk_buff *prev, struct sk_buff *next,
|
|
struct sk_buff_head *list)
|
|
{
|
|
newsk->next = next;
|
|
newsk->prev = prev;
|
|
next->prev = prev->next = newsk;
|
|
list->qlen++;
|
|
}
|
|
|
|
/*
|
|
* Place a packet after a given packet in a list.
|
|
*/
|
|
extern void skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list);
|
|
static inline void __skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list)
|
|
{
|
|
__skb_insert(newsk, old, old->next, list);
|
|
}
|
|
|
|
/*
|
|
* remove sk_buff from list. _Must_ be called atomically, and with
|
|
* the list known..
|
|
*/
|
|
extern void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list);
|
|
static inline void __skb_unlink(struct sk_buff *skb, struct sk_buff_head *list)
|
|
{
|
|
struct sk_buff *next, *prev;
|
|
|
|
list->qlen--;
|
|
next = skb->next;
|
|
prev = skb->prev;
|
|
skb->next = skb->prev = NULL;
|
|
next->prev = prev;
|
|
prev->next = next;
|
|
}
|
|
|
|
|
|
/* XXX: more streamlined implementation */
|
|
|
|
/**
|
|
* __skb_dequeue_tail - remove from the tail of the queue
|
|
* @list: list to dequeue from
|
|
*
|
|
* Remove the tail of the list. This function does not take any locks
|
|
* so must be used with appropriate locks held only. The tail item is
|
|
* returned or %NULL if the list is empty.
|
|
*/
|
|
extern struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list);
|
|
static inline struct sk_buff *__skb_dequeue_tail(struct sk_buff_head *list)
|
|
{
|
|
struct sk_buff *skb = skb_peek_tail(list);
|
|
if (skb)
|
|
__skb_unlink(skb, list);
|
|
return skb;
|
|
}
|
|
|
|
|
|
static inline int skb_is_nonlinear(const struct sk_buff *skb)
|
|
{
|
|
return skb->data_len;
|
|
}
|
|
|
|
static inline unsigned int skb_headlen(const struct sk_buff *skb)
|
|
{
|
|
return skb->len - skb->data_len;
|
|
}
|
|
|
|
static inline int skb_pagelen(const struct sk_buff *skb)
|
|
{
|
|
int i, len = 0;
|
|
|
|
for (i = (int)skb_shinfo(skb)->nr_frags - 1; i >= 0; i--)
|
|
len += skb_shinfo(skb)->frags[i].size;
|
|
return len + skb_headlen(skb);
|
|
}
|
|
|
|
static inline void skb_fill_page_desc(struct sk_buff *skb, int i,
|
|
struct page *page, int off, int size)
|
|
{
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
|
|
|
frag->page = page;
|
|
frag->page_offset = off;
|
|
frag->size = size;
|
|
skb_shinfo(skb)->nr_frags = i + 1;
|
|
}
|
|
|
|
#define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags)
|
|
#define SKB_FRAG_ASSERT(skb) BUG_ON(skb_shinfo(skb)->frag_list)
|
|
#define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb))
|
|
|
|
/*
|
|
* Add data to an sk_buff
|
|
*/
|
|
static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
unsigned char *tmp = skb->tail;
|
|
SKB_LINEAR_ASSERT(skb);
|
|
skb->tail += len;
|
|
skb->len += len;
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* skb_put - add data to a buffer
|
|
* @skb: buffer to use
|
|
* @len: amount of data to add
|
|
*
|
|
* This function extends the used data area of the buffer. If this would
|
|
* exceed the total buffer size the kernel will panic. A pointer to the
|
|
* first byte of the extra data is returned.
|
|
*/
|
|
static inline unsigned char *skb_put(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
unsigned char *tmp = skb->tail;
|
|
SKB_LINEAR_ASSERT(skb);
|
|
skb->tail += len;
|
|
skb->len += len;
|
|
if (unlikely(skb->tail>skb->end))
|
|
skb_over_panic(skb, len, current_text_addr());
|
|
return tmp;
|
|
}
|
|
|
|
static inline unsigned char *__skb_push(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
skb->data -= len;
|
|
skb->len += len;
|
|
return skb->data;
|
|
}
|
|
|
|
/**
|
|
* skb_push - add data to the start of a buffer
|
|
* @skb: buffer to use
|
|
* @len: amount of data to add
|
|
*
|
|
* This function extends the used data area of the buffer at the buffer
|
|
* start. If this would exceed the total buffer headroom the kernel will
|
|
* panic. A pointer to the first byte of the extra data is returned.
|
|
*/
|
|
static inline unsigned char *skb_push(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
skb->data -= len;
|
|
skb->len += len;
|
|
if (unlikely(skb->data<skb->head))
|
|
skb_under_panic(skb, len, current_text_addr());
|
|
return skb->data;
|
|
}
|
|
|
|
static inline unsigned char *__skb_pull(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
skb->len -= len;
|
|
BUG_ON(skb->len < skb->data_len);
|
|
return skb->data += len;
|
|
}
|
|
|
|
/**
|
|
* skb_pull - remove data from the start of a buffer
|
|
* @skb: buffer to use
|
|
* @len: amount of data to remove
|
|
*
|
|
* This function removes data from the start of a buffer, returning
|
|
* the memory to the headroom. A pointer to the next data in the buffer
|
|
* is returned. Once the data has been pulled future pushes will overwrite
|
|
* the old data.
|
|
*/
|
|
static inline unsigned char *skb_pull(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
return unlikely(len > skb->len) ? NULL : __skb_pull(skb, len);
|
|
}
|
|
|
|
extern unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta);
|
|
|
|
static inline unsigned char *__pskb_pull(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
if (len > skb_headlen(skb) &&
|
|
!__pskb_pull_tail(skb, len-skb_headlen(skb)))
|
|
return NULL;
|
|
skb->len -= len;
|
|
return skb->data += len;
|
|
}
|
|
|
|
static inline unsigned char *pskb_pull(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len);
|
|
}
|
|
|
|
static inline int pskb_may_pull(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
if (likely(len <= skb_headlen(skb)))
|
|
return 1;
|
|
if (unlikely(len > skb->len))
|
|
return 0;
|
|
return __pskb_pull_tail(skb, len-skb_headlen(skb)) != NULL;
|
|
}
|
|
|
|
/**
|
|
* skb_headroom - bytes at buffer head
|
|
* @skb: buffer to check
|
|
*
|
|
* Return the number of bytes of free space at the head of an &sk_buff.
|
|
*/
|
|
static inline int skb_headroom(const struct sk_buff *skb)
|
|
{
|
|
return skb->data - skb->head;
|
|
}
|
|
|
|
/**
|
|
* skb_tailroom - bytes at buffer end
|
|
* @skb: buffer to check
|
|
*
|
|
* Return the number of bytes of free space at the tail of an sk_buff
|
|
*/
|
|
static inline int skb_tailroom(const struct sk_buff *skb)
|
|
{
|
|
return skb_is_nonlinear(skb) ? 0 : skb->end - skb->tail;
|
|
}
|
|
|
|
/**
|
|
* skb_reserve - adjust headroom
|
|
* @skb: buffer to alter
|
|
* @len: bytes to move
|
|
*
|
|
* Increase the headroom of an empty &sk_buff by reducing the tail
|
|
* room. This is only allowed for an empty buffer.
|
|
*/
|
|
static inline void skb_reserve(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
skb->data += len;
|
|
skb->tail += len;
|
|
}
|
|
|
|
/*
|
|
* CPUs often take a performance hit when accessing unaligned memory
|
|
* locations. The actual performance hit varies, it can be small if the
|
|
* hardware handles it or large if we have to take an exception and fix it
|
|
* in software.
|
|
*
|
|
* Since an ethernet header is 14 bytes network drivers often end up with
|
|
* the IP header at an unaligned offset. The IP header can be aligned by
|
|
* shifting the start of the packet by 2 bytes. Drivers should do this
|
|
* with:
|
|
*
|
|
* skb_reserve(NET_IP_ALIGN);
|
|
*
|
|
* The downside to this alignment of the IP header is that the DMA is now
|
|
* unaligned. On some architectures the cost of an unaligned DMA is high
|
|
* and this cost outweighs the gains made by aligning the IP header.
|
|
*
|
|
* Since this trade off varies between architectures, we allow NET_IP_ALIGN
|
|
* to be overridden.
|
|
*/
|
|
#ifndef NET_IP_ALIGN
|
|
#define NET_IP_ALIGN 2
|
|
#endif
|
|
|
|
extern int ___pskb_trim(struct sk_buff *skb, unsigned int len, int realloc);
|
|
|
|
static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
if (!skb->data_len) {
|
|
skb->len = len;
|
|
skb->tail = skb->data + len;
|
|
} else
|
|
___pskb_trim(skb, len, 0);
|
|
}
|
|
|
|
/**
|
|
* skb_trim - remove end from a buffer
|
|
* @skb: buffer to alter
|
|
* @len: new length
|
|
*
|
|
* Cut the length of a buffer down by removing data from the tail. If
|
|
* the buffer is already under the length specified it is not modified.
|
|
*/
|
|
static inline void skb_trim(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
if (skb->len > len)
|
|
__skb_trim(skb, len);
|
|
}
|
|
|
|
|
|
static inline int __pskb_trim(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
if (!skb->data_len) {
|
|
skb->len = len;
|
|
skb->tail = skb->data+len;
|
|
return 0;
|
|
}
|
|
return ___pskb_trim(skb, len, 1);
|
|
}
|
|
|
|
static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
return (len < skb->len) ? __pskb_trim(skb, len) : 0;
|
|
}
|
|
|
|
/**
|
|
* skb_orphan - orphan a buffer
|
|
* @skb: buffer to orphan
|
|
*
|
|
* If a buffer currently has an owner then we call the owner's
|
|
* destructor function and make the @skb unowned. The buffer continues
|
|
* to exist but is no longer charged to its former owner.
|
|
*/
|
|
static inline void skb_orphan(struct sk_buff *skb)
|
|
{
|
|
if (skb->destructor)
|
|
skb->destructor(skb);
|
|
skb->destructor = NULL;
|
|
skb->sk = NULL;
|
|
}
|
|
|
|
/**
|
|
* __skb_queue_purge - empty a list
|
|
* @list: list to empty
|
|
*
|
|
* Delete all buffers on an &sk_buff list. Each buffer is removed from
|
|
* the list and one reference dropped. This function does not take the
|
|
* list lock and the caller must hold the relevant locks to use it.
|
|
*/
|
|
extern void skb_queue_purge(struct sk_buff_head *list);
|
|
static inline void __skb_queue_purge(struct sk_buff_head *list)
|
|
{
|
|
struct sk_buff *skb;
|
|
while ((skb = __skb_dequeue(list)) != NULL)
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
#ifndef CONFIG_HAVE_ARCH_DEV_ALLOC_SKB
|
|
/**
|
|
* __dev_alloc_skb - allocate an skbuff for sending
|
|
* @length: length to allocate
|
|
* @gfp_mask: get_free_pages mask, passed to alloc_skb
|
|
*
|
|
* Allocate a new &sk_buff and assign it a usage count of one. The
|
|
* buffer has unspecified headroom built in. Users should allocate
|
|
* the headroom they think they need without accounting for the
|
|
* built in space. The built in space is used for optimisations.
|
|
*
|
|
* %NULL is returned in there is no free memory.
|
|
*/
|
|
static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
|
|
gfp_t gfp_mask)
|
|
{
|
|
struct sk_buff *skb = alloc_skb(length + 16, gfp_mask);
|
|
if (likely(skb))
|
|
skb_reserve(skb, 16);
|
|
return skb;
|
|
}
|
|
#else
|
|
extern struct sk_buff *__dev_alloc_skb(unsigned int length, int gfp_mask);
|
|
#endif
|
|
|
|
/**
|
|
* dev_alloc_skb - allocate an skbuff for sending
|
|
* @length: length to allocate
|
|
*
|
|
* Allocate a new &sk_buff and assign it a usage count of one. The
|
|
* buffer has unspecified headroom built in. Users should allocate
|
|
* the headroom they think they need without accounting for the
|
|
* built in space. The built in space is used for optimisations.
|
|
*
|
|
* %NULL is returned in there is no free memory. Although this function
|
|
* allocates memory it can be called from an interrupt.
|
|
*/
|
|
static inline struct sk_buff *dev_alloc_skb(unsigned int length)
|
|
{
|
|
return __dev_alloc_skb(length, GFP_ATOMIC);
|
|
}
|
|
|
|
/**
|
|
* skb_cow - copy header of skb when it is required
|
|
* @skb: buffer to cow
|
|
* @headroom: needed headroom
|
|
*
|
|
* If the skb passed lacks sufficient headroom or its data part
|
|
* is shared, data is reallocated. If reallocation fails, an error
|
|
* is returned and original skb is not changed.
|
|
*
|
|
* The result is skb with writable area skb->head...skb->tail
|
|
* and at least @headroom of space at head.
|
|
*/
|
|
static inline int skb_cow(struct sk_buff *skb, unsigned int headroom)
|
|
{
|
|
int delta = (headroom > 16 ? headroom : 16) - skb_headroom(skb);
|
|
|
|
if (delta < 0)
|
|
delta = 0;
|
|
|
|
if (delta || skb_cloned(skb))
|
|
return pskb_expand_head(skb, (delta + 15) & ~15, 0, GFP_ATOMIC);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* skb_padto - pad an skbuff up to a minimal size
|
|
* @skb: buffer to pad
|
|
* @len: minimal length
|
|
*
|
|
* Pads up a buffer to ensure the trailing bytes exist and are
|
|
* blanked. If the buffer already contains sufficient data it
|
|
* is untouched. Returns the buffer, which may be a replacement
|
|
* for the original, or NULL for out of memory - in which case
|
|
* the original buffer is still freed.
|
|
*/
|
|
|
|
static inline struct sk_buff *skb_padto(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
unsigned int size = skb->len;
|
|
if (likely(size >= len))
|
|
return skb;
|
|
return skb_pad(skb, len-size);
|
|
}
|
|
|
|
static inline int skb_add_data(struct sk_buff *skb,
|
|
char __user *from, int copy)
|
|
{
|
|
const int off = skb->len;
|
|
|
|
if (skb->ip_summed == CHECKSUM_NONE) {
|
|
int err = 0;
|
|
unsigned int csum = csum_and_copy_from_user(from,
|
|
skb_put(skb, copy),
|
|
copy, 0, &err);
|
|
if (!err) {
|
|
skb->csum = csum_block_add(skb->csum, csum, off);
|
|
return 0;
|
|
}
|
|
} else if (!copy_from_user(skb_put(skb, copy), from, copy))
|
|
return 0;
|
|
|
|
__skb_trim(skb, off);
|
|
return -EFAULT;
|
|
}
|
|
|
|
static inline int skb_can_coalesce(struct sk_buff *skb, int i,
|
|
struct page *page, int off)
|
|
{
|
|
if (i) {
|
|
struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1];
|
|
|
|
return page == frag->page &&
|
|
off == frag->page_offset + frag->size;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* skb_linearize - convert paged skb to linear one
|
|
* @skb: buffer to linarize
|
|
* @gfp: allocation mode
|
|
*
|
|
* If there is no free memory -ENOMEM is returned, otherwise zero
|
|
* is returned and the old skb data released.
|
|
*/
|
|
extern int __skb_linearize(struct sk_buff *skb, gfp_t gfp);
|
|
static inline int skb_linearize(struct sk_buff *skb, gfp_t gfp)
|
|
{
|
|
return __skb_linearize(skb, gfp);
|
|
}
|
|
|
|
/**
|
|
* skb_postpull_rcsum - update checksum for received skb after pull
|
|
* @skb: buffer to update
|
|
* @start: start of data before pull
|
|
* @len: length of data pulled
|
|
*
|
|
* After doing a pull on a received packet, you need to call this to
|
|
* update the CHECKSUM_HW checksum, or set ip_summed to CHECKSUM_NONE
|
|
* so that it can be recomputed from scratch.
|
|
*/
|
|
|
|
static inline void skb_postpull_rcsum(struct sk_buff *skb,
|
|
const void *start, int len)
|
|
{
|
|
if (skb->ip_summed == CHECKSUM_HW)
|
|
skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0));
|
|
}
|
|
|
|
/**
|
|
* pskb_trim_rcsum - trim received skb and update checksum
|
|
* @skb: buffer to trim
|
|
* @len: new length
|
|
*
|
|
* This is exactly the same as pskb_trim except that it ensures the
|
|
* checksum of received packets are still valid after the operation.
|
|
*/
|
|
|
|
static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
|
|
{
|
|
if (likely(len >= skb->len))
|
|
return 0;
|
|
if (skb->ip_summed == CHECKSUM_HW)
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
return __pskb_trim(skb, len);
|
|
}
|
|
|
|
static inline void *kmap_skb_frag(const skb_frag_t *frag)
|
|
{
|
|
#ifdef CONFIG_HIGHMEM
|
|
BUG_ON(in_irq());
|
|
|
|
local_bh_disable();
|
|
#endif
|
|
return kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ);
|
|
}
|
|
|
|
static inline void kunmap_skb_frag(void *vaddr)
|
|
{
|
|
kunmap_atomic(vaddr, KM_SKB_DATA_SOFTIRQ);
|
|
#ifdef CONFIG_HIGHMEM
|
|
local_bh_enable();
|
|
#endif
|
|
}
|
|
|
|
#define skb_queue_walk(queue, skb) \
|
|
for (skb = (queue)->next; \
|
|
prefetch(skb->next), (skb != (struct sk_buff *)(queue)); \
|
|
skb = skb->next)
|
|
|
|
|
|
extern struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags,
|
|
int noblock, int *err);
|
|
extern unsigned int datagram_poll(struct file *file, struct socket *sock,
|
|
struct poll_table_struct *wait);
|
|
extern int skb_copy_datagram_iovec(const struct sk_buff *from,
|
|
int offset, struct iovec *to,
|
|
int size);
|
|
extern int skb_copy_and_csum_datagram_iovec(const
|
|
struct sk_buff *skb,
|
|
int hlen,
|
|
struct iovec *iov);
|
|
extern void skb_free_datagram(struct sock *sk, struct sk_buff *skb);
|
|
extern unsigned int skb_checksum(const struct sk_buff *skb, int offset,
|
|
int len, unsigned int csum);
|
|
extern int skb_copy_bits(const struct sk_buff *skb, int offset,
|
|
void *to, int len);
|
|
extern int skb_store_bits(const struct sk_buff *skb, int offset,
|
|
void *from, int len);
|
|
extern unsigned int skb_copy_and_csum_bits(const struct sk_buff *skb,
|
|
int offset, u8 *to, int len,
|
|
unsigned int csum);
|
|
extern void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to);
|
|
extern void skb_split(struct sk_buff *skb,
|
|
struct sk_buff *skb1, const u32 len);
|
|
|
|
extern void skb_release_data(struct sk_buff *skb);
|
|
|
|
static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
|
|
int len, void *buffer)
|
|
{
|
|
int hlen = skb_headlen(skb);
|
|
|
|
if (hlen - offset >= len)
|
|
return skb->data + offset;
|
|
|
|
if (skb_copy_bits(skb, offset, buffer, len) < 0)
|
|
return NULL;
|
|
|
|
return buffer;
|
|
}
|
|
|
|
extern void skb_init(void);
|
|
extern void skb_add_mtu(int mtu);
|
|
|
|
/**
|
|
* skb_get_timestamp - get timestamp from a skb
|
|
* @skb: skb to get stamp from
|
|
* @stamp: pointer to struct timeval to store stamp in
|
|
*
|
|
* Timestamps are stored in the skb as offsets to a base timestamp.
|
|
* This function converts the offset back to a struct timeval and stores
|
|
* it in stamp.
|
|
*/
|
|
static inline void skb_get_timestamp(const struct sk_buff *skb, struct timeval *stamp)
|
|
{
|
|
stamp->tv_sec = skb->tstamp.off_sec;
|
|
stamp->tv_usec = skb->tstamp.off_usec;
|
|
}
|
|
|
|
/**
|
|
* skb_set_timestamp - set timestamp of a skb
|
|
* @skb: skb to set stamp of
|
|
* @stamp: pointer to struct timeval to get stamp from
|
|
*
|
|
* Timestamps are stored in the skb as offsets to a base timestamp.
|
|
* This function converts a struct timeval to an offset and stores
|
|
* it in the skb.
|
|
*/
|
|
static inline void skb_set_timestamp(struct sk_buff *skb, const struct timeval *stamp)
|
|
{
|
|
skb->tstamp.off_sec = stamp->tv_sec;
|
|
skb->tstamp.off_usec = stamp->tv_usec;
|
|
}
|
|
|
|
extern void __net_timestamp(struct sk_buff *skb);
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
static inline void nf_conntrack_put(struct nf_conntrack *nfct)
|
|
{
|
|
if (nfct && atomic_dec_and_test(&nfct->use))
|
|
nfct->destroy(nfct);
|
|
}
|
|
static inline void nf_conntrack_get(struct nf_conntrack *nfct)
|
|
{
|
|
if (nfct)
|
|
atomic_inc(&nfct->use);
|
|
}
|
|
static inline void nf_reset(struct sk_buff *skb)
|
|
{
|
|
nf_conntrack_put(skb->nfct);
|
|
skb->nfct = NULL;
|
|
}
|
|
|
|
#ifdef CONFIG_BRIDGE_NETFILTER
|
|
static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge)
|
|
{
|
|
if (nf_bridge && atomic_dec_and_test(&nf_bridge->use))
|
|
kfree(nf_bridge);
|
|
}
|
|
static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge)
|
|
{
|
|
if (nf_bridge)
|
|
atomic_inc(&nf_bridge->use);
|
|
}
|
|
#endif /* CONFIG_BRIDGE_NETFILTER */
|
|
#else /* CONFIG_NETFILTER */
|
|
static inline void nf_reset(struct sk_buff *skb) {}
|
|
#endif /* CONFIG_NETFILTER */
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_SKBUFF_H */
|