#define _LINUX_SKBUFF_H
#include <linux/kernel.h>
+#include <linux/kmemcheck.h>
#include <linux/compiler.h>
#include <linux/time.h>
#include <linux/cache.h>
#include <linux/dmaengine.h>
#include <linux/hrtimer.h>
-#define HAVE_ALLOC_SKB /* For the drivers to know */
-#define HAVE_ALIGNABLE_SKB /* Ditto 8) */
-
/* Don't change this without changing skb_csum_unnecessary! */
#define CHECKSUM_NONE 0
#define CHECKSUM_UNNECESSARY 1
__u32 size;
};
+#define HAVE_HW_TIME_STAMP
+
+/**
+ * struct skb_shared_hwtstamps - hardware time stamps
+ * @hwtstamp: hardware time stamp transformed into duration
+ * since arbitrary point in time
+ * @syststamp: hwtstamp transformed to system time base
+ *
+ * Software time stamps generated by ktime_get_real() are stored in
+ * skb->tstamp. The relation between the different kinds of time
+ * stamps is as follows:
+ *
+ * syststamp and tstamp can be compared against each other in
+ * arbitrary combinations. The accuracy of a
+ * syststamp/tstamp/"syststamp from other device" comparison is
+ * limited by the accuracy of the transformation into system time
+ * base. This depends on the device driver and its underlying
+ * hardware.
+ *
+ * hwtstamps can only be compared against other hwtstamps from
+ * the same device.
+ *
+ * This structure is attached to packets as part of the
+ * &skb_shared_info. Use skb_hwtstamps() to get a pointer.
+ */
+struct skb_shared_hwtstamps {
+ ktime_t hwtstamp;
+ ktime_t syststamp;
+};
+
+/**
+ * struct skb_shared_tx - instructions for time stamping of outgoing packets
+ * @hardware: generate hardware time stamp
+ * @software: generate software time stamp
+ * @in_progress: device driver is going to provide
+ * hardware time stamp
+ * @flags: all shared_tx flags
+ *
+ * These flags are attached to packets as part of the
+ * &skb_shared_info. Use skb_tx() to get a pointer.
+ */
+union skb_shared_tx {
+ struct {
+ __u8 hardware:1,
+ software:1,
+ in_progress:1;
+ };
+ __u8 flags;
+};
+
/* This data is invariant across clones and lives at
* the end of the header data, ie. at skb->end.
*/
struct skb_shared_info {
- atomic_t dataref;
unsigned short nr_frags;
unsigned short gso_size;
/* Warning: this field is not always filled in (UFO)! */
unsigned short gso_segs;
unsigned short gso_type;
__be32 ip6_frag_id;
-#ifdef CONFIG_HAS_DMA
- unsigned int num_dma_maps;
-#endif
+ union skb_shared_tx tx_flags;
struct sk_buff *frag_list;
+ struct skb_shared_hwtstamps hwtstamps;
+
+ /*
+ * Warning : all fields before dataref are cleared in __alloc_skb()
+ */
+ atomic_t dataref;
+
skb_frag_t frags[MAX_SKB_FRAGS];
-#ifdef CONFIG_HAS_DMA
- dma_addr_t dma_maps[MAX_SKB_FRAGS + 1];
-#endif
+ /* Intermediate layers must ensure that destructor_arg
+ * remains valid until skb destructor */
+ void * destructor_arg;
};
/* We divide dataref into two halves. The higher 16 bits hold references
SKB_GSO_TCP_ECN = 1 << 3,
SKB_GSO_TCPV6 = 1 << 4,
+
+ SKB_GSO_FCOE = 1 << 5,
};
#if BITS_PER_LONG > 32
* @transport_header: Transport layer header
* @network_header: Network layer header
* @mac_header: Link layer header
- * @dst: destination entry
+ * @_skb_refdst: destination entry (with norefcount bit)
* @sp: the security path, used for xfrm
* @cb: Control buffer. Free for use by every layer. Put private vars here
* @len: Length of actual data
* @nfctinfo: Relationship of this skb to the connection
* @nfct_reasm: netfilter conntrack re-assembly pointer
* @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
- * @iif: ifindex of device we arrived on
+ * @skb_iif: ifindex of device we arrived on
+ * @rxhash: the packet hash computed on receive
* @queue_mapping: Queue mapping for multiqueue devices
* @tc_index: Traffic control index
* @tc_verd: traffic control verdict
* @ndisc_nodetype: router type (from link layer)
- * @do_not_encrypt: set to prevent encryption of this frame
* @dma_cookie: a cookie to one of several possible DMA operations
* done by skb DMA functions
* @secmark: security marking
struct sk_buff *next;
struct sk_buff *prev;
- struct sock *sk;
ktime_t tstamp;
+
+ struct sock *sk;
struct net_device *dev;
- union {
- struct dst_entry *dst;
- struct rtable *rtable;
- };
-#ifdef CONFIG_XFRM
- struct sec_path *sp;
-#endif
/*
* This is the control buffer. It is free to use for every
* layer. Please put your private variables there. If you
* want to keep them across layers you have to do a skb_clone()
* first. This is owned by whoever has the skb queued ATM.
*/
- char cb[48];
+ char cb[48] __aligned(8);
+ unsigned long _skb_refdst;
+#ifdef CONFIG_XFRM
+ struct sec_path *sp;
+#endif
unsigned int len,
data_len;
__u16 mac_len,
};
};
__u32 priority;
+ kmemcheck_bitfield_begin(flags1);
__u8 local_df:1,
cloned:1,
ip_summed:2,
ipvs_property:1,
peeked:1,
nf_trace:1;
+ kmemcheck_bitfield_end(flags1);
__be16 protocol;
void (*destructor)(struct sk_buff *skb);
struct nf_bridge_info *nf_bridge;
#endif
- int iif;
- __u16 queue_mapping;
+ int skb_iif;
#ifdef CONFIG_NET_SCHED
__u16 tc_index; /* traffic control index */
#ifdef CONFIG_NET_CLS_ACT
__u16 tc_verd; /* traffic control verdict */
#endif
#endif
+
+ __u32 rxhash;
+
+ kmemcheck_bitfield_begin(flags2);
+ __u16 queue_mapping:16;
#ifdef CONFIG_IPV6_NDISC_NODETYPE
__u8 ndisc_nodetype:2;
#endif
-#if defined(CONFIG_MAC80211) || defined(CONFIG_MAC80211_MODULE)
- __u8 do_not_encrypt:1;
-#endif
- /* 0/13/14 bit hole */
+ kmemcheck_bitfield_end(flags2);
+
+ /* 0/14 bit hole */
#ifdef CONFIG_NET_DMA
dma_cookie_t dma_cookie;
#ifdef CONFIG_NETWORK_SECMARK
__u32 secmark;
#endif
-
- __u32 mark;
+ union {
+ __u32 mark;
+ __u32 dropcount;
+ };
__u16 vlan_tci;
#include <asm/system.h>
-#ifdef CONFIG_HAS_DMA
-#include <linux/dma-mapping.h>
-extern int skb_dma_map(struct device *dev, struct sk_buff *skb,
- enum dma_data_direction dir);
-extern void skb_dma_unmap(struct device *dev, struct sk_buff *skb,
- enum dma_data_direction dir);
-#endif
+/*
+ * skb might have a dst pointer attached, refcounted or not.
+ * _skb_refdst low order bit is set if refcount was _not_ taken
+ */
+#define SKB_DST_NOREF 1UL
+#define SKB_DST_PTRMASK ~(SKB_DST_NOREF)
+
+/**
+ * skb_dst - returns skb dst_entry
+ * @skb: buffer
+ *
+ * Returns skb dst_entry, regardless of reference taken or not.
+ */
+static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
+{
+ /* If refdst was not refcounted, check we still are in a
+ * rcu_read_lock section
+ */
+ WARN_ON((skb->_skb_refdst & SKB_DST_NOREF) &&
+ !rcu_read_lock_held() &&
+ !rcu_read_lock_bh_held());
+ return (struct dst_entry *)(skb->_skb_refdst & SKB_DST_PTRMASK);
+}
+
+/**
+ * skb_dst_set - sets skb dst
+ * @skb: buffer
+ * @dst: dst entry
+ *
+ * Sets skb dst, assuming a reference was taken on dst and should
+ * be released by skb_dst_drop()
+ */
+static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
+{
+ skb->_skb_refdst = (unsigned long)dst;
+}
+
+/**
+ * skb_dst_set_noref - sets skb dst, without a reference
+ * @skb: buffer
+ * @dst: dst entry
+ *
+ * Sets skb dst, assuming a reference was not taken on dst
+ * skb_dst_drop() should not dst_release() this dst
+ */
+static inline void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst)
+{
+ WARN_ON(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
+ skb->_skb_refdst = (unsigned long)dst | SKB_DST_NOREF;
+}
+
+/**
+ * skb_dst_is_noref - Test if skb dst isnt refcounted
+ * @skb: buffer
+ */
+static inline bool skb_dst_is_noref(const struct sk_buff *skb)
+{
+ return (skb->_skb_refdst & SKB_DST_NOREF) && skb_dst(skb);
+}
+
+static inline struct rtable *skb_rtable(const struct sk_buff *skb)
+{
+ return (struct rtable *)skb_dst(skb);
+}
extern void kfree_skb(struct sk_buff *skb);
+extern void consume_skb(struct sk_buff *skb);
extern void __kfree_skb(struct sk_buff *skb);
extern struct sk_buff *__alloc_skb(unsigned int size,
gfp_t priority, int fclone, int node);
extern int skb_cow_data(struct sk_buff *skb, int tailbits,
struct sk_buff **trailer);
extern int skb_pad(struct sk_buff *skb, int pad);
-#define dev_kfree_skb(a) kfree_skb(a)
-extern void skb_over_panic(struct sk_buff *skb, int len,
- void *here);
-extern void skb_under_panic(struct sk_buff *skb, int len,
- void *here);
-extern void skb_truesize_bug(struct sk_buff *skb);
-
-static inline void skb_truesize_check(struct sk_buff *skb)
-{
- int len = sizeof(struct sk_buff) + skb->len;
-
- if (unlikely((int)skb->truesize < len))
- skb_truesize_bug(skb);
-}
+#define dev_kfree_skb(a) consume_skb(a)
extern int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
int getfrag(void *from, char *to, int offset,
int len,int odd, struct sk_buff *skb),
void *from, int length);
-struct skb_seq_state
-{
+struct skb_seq_state {
__u32 lower_offset;
__u32 upper_offset;
__u32 frag_idx;
/* Internal */
#define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB)))
+static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb)
+{
+ return &skb_shinfo(skb)->hwtstamps;
+}
+
+static inline union skb_shared_tx *skb_tx(struct sk_buff *skb)
+{
+ return &skb_shinfo(skb)->tx_flags;
+}
+
/**
* skb_queue_empty - check if a queue is empty
* @list: queue head
}
/**
+ * skb_queue_is_first - check if skb is the first entry in the queue
+ * @list: queue head
+ * @skb: buffer
+ *
+ * Returns true if @skb is the first buffer on the list.
+ */
+static inline bool skb_queue_is_first(const struct sk_buff_head *list,
+ const struct sk_buff *skb)
+{
+ return (skb->prev == (struct sk_buff *) list);
+}
+
+/**
* skb_queue_next - return the next packet in the queue
* @list: queue head
* @skb: current buffer
}
/**
+ * skb_queue_prev - return the prev packet in the queue
+ * @list: queue head
+ * @skb: current buffer
+ *
+ * Return the prev packet in @list before @skb. It is only valid to
+ * call this if skb_queue_is_first() evaluates to false.
+ */
+static inline struct sk_buff *skb_queue_prev(const struct sk_buff_head *list,
+ const struct sk_buff *skb)
+{
+ /* This BUG_ON may seem severe, but if we just return then we
+ * are going to dereference garbage.
+ */
+ BUG_ON(skb_queue_is_first(list, skb));
+ return skb->prev;
+}
+
+/**
* skb_get - reference buffer
* @skb: buffer to reference
*
}
/**
- * skb_peek
+ * skb_peek - peek at the head of an &sk_buff_head
* @list_: list to peek at
*
* Peek an &sk_buff. Unlike most other operations you _MUST_
}
/**
- * skb_peek_tail
+ * skb_peek_tail - peek at the tail of an &sk_buff_head
* @list_: list to peek at
*
* Peek an &sk_buff. Unlike most other operations you _MUST_
int off, int size);
#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_FRAG_ASSERT(skb) BUG_ON(skb_has_frags(skb))
#define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb))
#ifdef NET_SKBUFF_DATA_USES_OFFSET
return skb->data += len;
}
+static inline unsigned char *skb_pull_inline(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)
* shifting the start of the packet by 2 bytes. Drivers should do this
* with:
*
- * skb_reserve(NET_IP_ALIGN);
+ * skb_reserve(skb, 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.
*/
* The networking layer reserves some headroom in skb data (via
* dev_alloc_skb). This is used to avoid having to reallocate skb data when
* the header has to grow. In the default case, if the header has to grow
- * 16 bytes or less we avoid the reallocation.
+ * 32 bytes or less we avoid the reallocation.
*
* Unfortunately this headroom changes the DMA alignment of the resulting
* network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
* perhaps setting it to a cacheline in size (since that will maintain
* cacheline alignment of the DMA). It must be a power of 2.
*
- * Various parts of the networking layer expect at least 16 bytes of
+ * Various parts of the networking layer expect at least 32 bytes of
* headroom, you should not reduce this.
+ * With RPS, we raised NET_SKB_PAD to 64 so that get_rps_cpus() fetches span
+ * a 64 bytes aligned block to fit modern (>= 64 bytes) cache line sizes
+ * NET_IP_ALIGN(2) + ethernet_header(14) + IP_header(20/40) + ports(8)
*/
#ifndef NET_SKB_PAD
-#define NET_SKB_PAD 16
+#define NET_SKB_PAD 64
#endif
extern int ___pskb_trim(struct sk_buff *skb, unsigned int len);
return __netdev_alloc_skb(dev, length, GFP_ATOMIC);
}
+static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
+ unsigned int length)
+{
+ struct sk_buff *skb = netdev_alloc_skb(dev, length + NET_IP_ALIGN);
+
+ if (NET_IP_ALIGN && skb)
+ skb_reserve(skb, NET_IP_ALIGN);
+ return skb;
+}
+
extern struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask);
/**
skb = skb->prev)
+static inline bool skb_has_frags(const struct sk_buff *skb)
+{
+ return skb_shinfo(skb)->frag_list != NULL;
+}
+
+static inline void skb_frag_list_init(struct sk_buff *skb)
+{
+ skb_shinfo(skb)->frag_list = NULL;
+}
+
+static inline void skb_frag_add_head(struct sk_buff *skb, struct sk_buff *frag)
+{
+ frag->next = skb_shinfo(skb)->frag_list;
+ skb_shinfo(skb)->frag_list = frag;
+}
+
+#define skb_walk_frags(skb, iter) \
+ for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)
+
extern struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags,
int *peeked, int *err);
extern struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags,
struct iovec *iov);
extern int skb_copy_datagram_from_iovec(struct sk_buff *skb,
int offset,
- struct iovec *from,
+ const struct iovec *from,
+ int from_offset,
int len);
+extern int skb_copy_datagram_const_iovec(const struct sk_buff *from,
+ int offset,
+ const struct iovec *to,
+ int to_offset,
+ int size);
extern void skb_free_datagram(struct sock *sk, struct sk_buff *skb);
+extern void skb_free_datagram_locked(struct sock *sk,
+ struct sk_buff *skb);
extern int skb_kill_datagram(struct sock *sk, struct sk_buff *skb,
unsigned int flags);
extern __wsum skb_checksum(const struct sk_buff *skb, int offset,
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 int skb_shift(struct sk_buff *tgt, struct sk_buff *skb,
+ int shiftlen);
extern struct sk_buff *skb_segment(struct sk_buff *skb, int features);
extern void skb_init(void);
+static inline ktime_t skb_get_ktime(const struct sk_buff *skb)
+{
+ return skb->tstamp;
+}
+
/**
* skb_get_timestamp - get timestamp from a skb
* @skb: skb to get stamp from
* 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)
+static inline void skb_get_timestamp(const struct sk_buff *skb,
+ struct timeval *stamp)
{
*stamp = ktime_to_timeval(skb->tstamp);
}
+static inline void skb_get_timestampns(const struct sk_buff *skb,
+ struct timespec *stamp)
+{
+ *stamp = ktime_to_timespec(skb->tstamp);
+}
+
static inline void __net_timestamp(struct sk_buff *skb)
{
skb->tstamp = ktime_get_real();
return ktime_set(0, 0);
}
+/**
+ * skb_tstamp_tx - queue clone of skb with send time stamps
+ * @orig_skb: the original outgoing packet
+ * @hwtstamps: hardware time stamps, may be NULL if not available
+ *
+ * If the skb has a socket associated, then this function clones the
+ * skb (thus sharing the actual data and optional structures), stores
+ * the optional hardware time stamping information (if non NULL) or
+ * generates a software time stamp (otherwise), then queues the clone
+ * to the error queue of the socket. Errors are silently ignored.
+ */
+extern void skb_tstamp_tx(struct sk_buff *orig_skb,
+ struct skb_shared_hwtstamps *hwtstamps);
+
extern __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len);
extern __sum16 __skb_checksum_complete(struct sk_buff *skb);
skb->queue_mapping = queue_mapping;
}
-static inline u16 skb_get_queue_mapping(struct sk_buff *skb)
+static inline u16 skb_get_queue_mapping(const struct sk_buff *skb)
{
return skb->queue_mapping;
}
to->queue_mapping = from->queue_mapping;
}
+static inline void skb_record_rx_queue(struct sk_buff *skb, u16 rx_queue)
+{
+ skb->queue_mapping = rx_queue + 1;
+}
+
+static inline u16 skb_get_rx_queue(const struct sk_buff *skb)
+{
+ return skb->queue_mapping - 1;
+}
+
+static inline bool skb_rx_queue_recorded(const struct sk_buff *skb)
+{
+ return (skb->queue_mapping != 0);
+}
+
+extern u16 skb_tx_hash(const struct net_device *dev,
+ const struct sk_buff *skb);
+
#ifdef CONFIG_XFRM
static inline struct sec_path *skb_sec_path(struct sk_buff *skb)
{
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