/*
* Routines having to do with the 'struct sk_buff' memory handlers.
*
- * Authors: Alan Cox <iiitac@pyr.swan.ac.uk>
+ * Authors: Alan Cox <alan@lxorguk.ukuu.org.uk>
* Florian La Roche <rzsfl@rz.uni-sb.de>
*
- * Version: $Id: skbuff.c,v 1.90 2001/11/07 05:56:19 davem Exp $
- *
* Fixes:
* Alan Cox : Fixed the worst of the load
* balancer bugs.
#endif
#include <linux/string.h>
#include <linux/skbuff.h>
+#include <linux/splice.h>
#include <linux/cache.h>
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <linux/scatterlist.h>
+#include <linux/errqueue.h>
#include <net/protocol.h>
#include <net/dst.h>
#include <asm/uaccess.h>
#include <asm/system.h>
+#include <trace/events/skb.h>
#include "kmap_skb.h"
static struct kmem_cache *skbuff_head_cache __read_mostly;
static struct kmem_cache *skbuff_fclone_cache __read_mostly;
+static void sock_pipe_buf_release(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf)
+{
+ put_page(buf->page);
+}
+
+static void sock_pipe_buf_get(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf)
+{
+ get_page(buf->page);
+}
+
+static int sock_pipe_buf_steal(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf)
+{
+ return 1;
+}
+
+
+/* Pipe buffer operations for a socket. */
+static struct pipe_buf_operations sock_pipe_buf_ops = {
+ .can_merge = 0,
+ .map = generic_pipe_buf_map,
+ .unmap = generic_pipe_buf_unmap,
+ .confirm = generic_pipe_buf_confirm,
+ .release = sock_pipe_buf_release,
+ .steal = sock_pipe_buf_steal,
+ .get = sock_pipe_buf_get,
+};
+
/*
* Keep out-of-line to prevent kernel bloat.
* __builtin_return_address is not used because it is not always
skb->dev ? skb->dev->name : "<NULL>");
BUG();
}
+EXPORT_SYMBOL(skb_over_panic);
/**
* skb_under_panic - private function
skb->dev ? skb->dev->name : "<NULL>");
BUG();
}
-
-void skb_truesize_bug(struct sk_buff *skb)
-{
- printk(KERN_ERR "SKB BUG: Invalid truesize (%u) "
- "len=%u, sizeof(sk_buff)=%Zd\n",
- skb->truesize, skb->len, sizeof(struct sk_buff));
-}
-EXPORT_SYMBOL(skb_truesize_bug);
+EXPORT_SYMBOL(skb_under_panic);
/* Allocate a new skbuff. We do this ourselves so we can fill in a few
* 'private' fields and also do memory statistics to find all the
goto nodata;
/*
- * See comment in sk_buff definition, just before the 'tail' member
+ * Only clear those fields we need to clear, not those that we will
+ * actually initialise below. Hence, don't put any more fields after
+ * the tail pointer in struct sk_buff!
*/
memset(skb, 0, offsetof(struct sk_buff, tail));
skb->truesize = size + sizeof(struct sk_buff);
shinfo->gso_segs = 0;
shinfo->gso_type = 0;
shinfo->ip6_frag_id = 0;
+ shinfo->tx_flags.flags = 0;
shinfo->frag_list = NULL;
+ memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));
if (fclone) {
struct sk_buff *child = skb + 1;
skb = NULL;
goto out;
}
+EXPORT_SYMBOL(__alloc_skb);
/**
* __netdev_alloc_skb - allocate an skbuff for rx on a specific device
}
return skb;
}
+EXPORT_SYMBOL(__netdev_alloc_skb);
+
+struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)
+{
+ int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
+ struct page *page;
+
+ page = alloc_pages_node(node, gfp_mask, 0);
+ return page;
+}
+EXPORT_SYMBOL(__netdev_alloc_page);
+
+void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
+ int size)
+{
+ skb_fill_page_desc(skb, i, page, off, size);
+ skb->len += size;
+ skb->data_len += size;
+ skb->truesize += size;
+}
+EXPORT_SYMBOL(skb_add_rx_frag);
+
+/**
+ * dev_alloc_skb - allocate an skbuff for receiving
+ * @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 if there is no free memory. Although this function
+ * allocates memory it can be called from an interrupt.
+ */
+struct sk_buff *dev_alloc_skb(unsigned int length)
+{
+ /*
+ * There is more code here than it seems:
+ * __dev_alloc_skb is an inline
+ */
+ return __dev_alloc_skb(length, GFP_ATOMIC);
+}
+EXPORT_SYMBOL(dev_alloc_skb);
static void skb_drop_list(struct sk_buff **listp)
{
/*
* Free an skbuff by memory without cleaning the state.
*/
-void kfree_skbmem(struct sk_buff *skb)
+static void kfree_skbmem(struct sk_buff *skb)
{
struct sk_buff *other;
atomic_t *fclone_ref;
- skb_release_data(skb);
switch (skb->fclone) {
case SKB_FCLONE_UNAVAILABLE:
kmem_cache_free(skbuff_head_cache, skb);
if (atomic_dec_and_test(fclone_ref))
kmem_cache_free(skbuff_fclone_cache, other);
break;
- };
+ }
}
-/**
- * __kfree_skb - private function
- * @skb: buffer
- *
- * Free an sk_buff. Release anything attached to the buffer.
- * Clean the state. This is an internal helper function. Users should
- * always call kfree_skb
- */
-
-void __kfree_skb(struct sk_buff *skb)
+static void skb_release_head_state(struct sk_buff *skb)
{
dst_release(skb->dst);
#ifdef CONFIG_XFRM
skb->tc_verd = 0;
#endif
#endif
+}
+
+/* Free everything but the sk_buff shell. */
+static void skb_release_all(struct sk_buff *skb)
+{
+ skb_release_head_state(skb);
+ skb_release_data(skb);
+}
+
+/**
+ * __kfree_skb - private function
+ * @skb: buffer
+ *
+ * Free an sk_buff. Release anything attached to the buffer.
+ * Clean the state. This is an internal helper function. Users should
+ * always call kfree_skb
+ */
+void __kfree_skb(struct sk_buff *skb)
+{
+ skb_release_all(skb);
kfree_skbmem(skb);
}
+EXPORT_SYMBOL(__kfree_skb);
/**
* kfree_skb - free an sk_buff
smp_rmb();
else if (likely(!atomic_dec_and_test(&skb->users)))
return;
+ trace_kfree_skb(skb, __builtin_return_address(0));
+ __kfree_skb(skb);
+}
+EXPORT_SYMBOL(kfree_skb);
+
+/**
+ * consume_skb - free an skbuff
+ * @skb: buffer to free
+ *
+ * Drop a ref to the buffer and free it if the usage count has hit zero
+ * Functions identically to kfree_skb, but kfree_skb assumes that the frame
+ * is being dropped after a failure and notes that
+ */
+void consume_skb(struct sk_buff *skb)
+{
+ if (unlikely(!skb))
+ return;
+ if (likely(atomic_read(&skb->users) == 1))
+ smp_rmb();
+ else if (likely(!atomic_dec_and_test(&skb->users)))
+ return;
__kfree_skb(skb);
}
+EXPORT_SYMBOL(consume_skb);
+
+/**
+ * skb_recycle_check - check if skb can be reused for receive
+ * @skb: buffer
+ * @skb_size: minimum receive buffer size
+ *
+ * Checks that the skb passed in is not shared or cloned, and
+ * that it is linear and its head portion at least as large as
+ * skb_size so that it can be recycled as a receive buffer.
+ * If these conditions are met, this function does any necessary
+ * reference count dropping and cleans up the skbuff as if it
+ * just came from __alloc_skb().
+ */
+int skb_recycle_check(struct sk_buff *skb, int skb_size)
+{
+ struct skb_shared_info *shinfo;
+
+ if (skb_is_nonlinear(skb) || skb->fclone != SKB_FCLONE_UNAVAILABLE)
+ return 0;
+
+ skb_size = SKB_DATA_ALIGN(skb_size + NET_SKB_PAD);
+ if (skb_end_pointer(skb) - skb->head < skb_size)
+ return 0;
+
+ if (skb_shared(skb) || skb_cloned(skb))
+ return 0;
+
+ skb_release_head_state(skb);
+ shinfo = skb_shinfo(skb);
+ atomic_set(&shinfo->dataref, 1);
+ shinfo->nr_frags = 0;
+ shinfo->gso_size = 0;
+ shinfo->gso_segs = 0;
+ shinfo->gso_type = 0;
+ shinfo->ip6_frag_id = 0;
+ shinfo->tx_flags.flags = 0;
+ shinfo->frag_list = NULL;
+ memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));
+
+ memset(skb, 0, offsetof(struct sk_buff, tail));
+ skb->data = skb->head + NET_SKB_PAD;
+ skb_reset_tail_pointer(skb);
+
+ return 1;
+}
+EXPORT_SYMBOL(skb_recycle_check);
+
+static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
+{
+ new->tstamp = old->tstamp;
+ new->dev = old->dev;
+ new->transport_header = old->transport_header;
+ new->network_header = old->network_header;
+ new->mac_header = old->mac_header;
+ new->dst = dst_clone(old->dst);
+#ifdef CONFIG_XFRM
+ new->sp = secpath_get(old->sp);
+#endif
+ memcpy(new->cb, old->cb, sizeof(old->cb));
+ new->csum_start = old->csum_start;
+ new->csum_offset = old->csum_offset;
+ new->local_df = old->local_df;
+ new->pkt_type = old->pkt_type;
+ new->ip_summed = old->ip_summed;
+ skb_copy_queue_mapping(new, old);
+ new->priority = old->priority;
+#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
+ new->ipvs_property = old->ipvs_property;
+#endif
+ new->protocol = old->protocol;
+ new->mark = old->mark;
+ __nf_copy(new, old);
+#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
+ defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
+ new->nf_trace = old->nf_trace;
+#endif
+#ifdef CONFIG_NET_SCHED
+ new->tc_index = old->tc_index;
+#ifdef CONFIG_NET_CLS_ACT
+ new->tc_verd = old->tc_verd;
+#endif
+#endif
+ new->vlan_tci = old->vlan_tci;
+
+ skb_copy_secmark(new, old);
+}
+
+static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb)
+{
+#define C(x) n->x = skb->x
+
+ n->next = n->prev = NULL;
+ n->sk = NULL;
+ __copy_skb_header(n, skb);
+
+ C(len);
+ C(data_len);
+ C(mac_len);
+ n->hdr_len = skb->nohdr ? skb_headroom(skb) : skb->hdr_len;
+ n->cloned = 1;
+ n->nohdr = 0;
+ n->destructor = NULL;
+ C(iif);
+ C(tail);
+ C(end);
+ C(head);
+ C(data);
+ C(truesize);
+#if defined(CONFIG_MAC80211) || defined(CONFIG_MAC80211_MODULE)
+ C(do_not_encrypt);
+ C(requeue);
+#endif
+ atomic_set(&n->users, 1);
+
+ atomic_inc(&(skb_shinfo(skb)->dataref));
+ skb->cloned = 1;
+
+ return n;
+#undef C
+}
+
+/**
+ * skb_morph - morph one skb into another
+ * @dst: the skb to receive the contents
+ * @src: the skb to supply the contents
+ *
+ * This is identical to skb_clone except that the target skb is
+ * supplied by the user.
+ *
+ * The target skb is returned upon exit.
+ */
+struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src)
+{
+ skb_release_all(dst);
+ return __skb_clone(dst, src);
+}
+EXPORT_SYMBOL_GPL(skb_morph);
/**
* skb_clone - duplicate an sk_buff
n->fclone = SKB_FCLONE_UNAVAILABLE;
}
-#define C(x) n->x = skb->x
-
- n->next = n->prev = NULL;
- n->sk = NULL;
- C(tstamp);
- C(dev);
- C(transport_header);
- C(network_header);
- C(mac_header);
- C(dst);
- dst_clone(skb->dst);
- C(sp);
-#ifdef CONFIG_INET
- secpath_get(skb->sp);
-#endif
- memcpy(n->cb, skb->cb, sizeof(skb->cb));
- C(len);
- C(data_len);
- C(mac_len);
- C(csum);
- C(local_df);
- n->cloned = 1;
- n->nohdr = 0;
- C(pkt_type);
- C(ip_summed);
- C(priority);
-#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
- C(ipvs_property);
-#endif
- C(protocol);
- n->destructor = NULL;
- C(mark);
- __nf_copy(n, skb);
-#ifdef CONFIG_NET_SCHED
- C(tc_index);
-#ifdef CONFIG_NET_CLS_ACT
- n->tc_verd = SET_TC_VERD(skb->tc_verd,0);
- n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
- n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
- C(iif);
-#endif
- skb_copy_secmark(n, skb);
-#endif
- C(truesize);
- atomic_set(&n->users, 1);
- C(head);
- C(data);
- C(tail);
- C(end);
-
- atomic_inc(&(skb_shinfo(skb)->dataref));
- skb->cloned = 1;
-
- return n;
+ return __skb_clone(n, skb);
}
+EXPORT_SYMBOL(skb_clone);
static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
{
*/
unsigned long offset = new->data - old->data;
#endif
- new->sk = NULL;
- new->dev = old->dev;
- new->priority = old->priority;
- new->protocol = old->protocol;
- new->dst = dst_clone(old->dst);
-#ifdef CONFIG_INET
- new->sp = secpath_get(old->sp);
-#endif
- new->transport_header = old->transport_header;
- new->network_header = old->network_header;
- new->mac_header = old->mac_header;
+
+ __copy_skb_header(new, old);
+
#ifndef NET_SKBUFF_DATA_USES_OFFSET
/* {transport,network,mac}_header are relative to skb->head */
new->transport_header += offset;
new->network_header += offset;
new->mac_header += offset;
#endif
- memcpy(new->cb, old->cb, sizeof(old->cb));
- new->local_df = old->local_df;
- new->fclone = SKB_FCLONE_UNAVAILABLE;
- new->pkt_type = old->pkt_type;
- new->tstamp = old->tstamp;
- new->destructor = NULL;
- new->mark = old->mark;
- __nf_copy(new, old);
-#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
- new->ipvs_property = old->ipvs_property;
-#endif
-#ifdef CONFIG_NET_SCHED
-#ifdef CONFIG_NET_CLS_ACT
- new->tc_verd = old->tc_verd;
-#endif
- new->tc_index = old->tc_index;
-#endif
- skb_copy_secmark(new, old);
- atomic_set(&new->users, 1);
skb_shinfo(new)->gso_size = skb_shinfo(old)->gso_size;
skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs;
skb_shinfo(new)->gso_type = skb_shinfo(old)->gso_type;
skb_reserve(n, headerlen);
/* Set the tail pointer and length */
skb_put(n, skb->len);
- n->csum = skb->csum;
- n->ip_summed = skb->ip_summed;
if (skb_copy_bits(skb, -headerlen, n->head, headerlen + skb->len))
BUG();
copy_skb_header(n, skb);
return n;
}
-
+EXPORT_SYMBOL(skb_copy);
/**
* pskb_copy - create copy of an sk_buff with private head.
skb_put(n, skb_headlen(skb));
/* Copy the bytes */
skb_copy_from_linear_data(skb, n->data, n->len);
- n->csum = skb->csum;
- n->ip_summed = skb->ip_summed;
n->truesize += skb->data_len;
n->data_len = skb->data_len;
out:
return n;
}
+EXPORT_SYMBOL(pskb_copy);
/**
* pskb_expand_head - reallocate header of &sk_buff
#endif
long off;
+ BUG_ON(nhead < 0);
+
if (skb_shared(skb))
BUG();
/* Copy only real data... and, alas, header. This should be
* optimized for the cases when header is void. */
- memcpy(data + nhead, skb->head,
#ifdef NET_SKBUFF_DATA_USES_OFFSET
- skb->tail);
+ memcpy(data + nhead, skb->head, skb->tail);
#else
- skb->tail - skb->head);
+ memcpy(data + nhead, skb->head, skb->tail - skb->head);
#endif
memcpy(data + size, skb_end_pointer(skb),
sizeof(struct skb_shared_info));
skb->transport_header += off;
skb->network_header += off;
skb->mac_header += off;
+ skb->csum_start += nhead;
skb->cloned = 0;
+ skb->hdr_len = 0;
skb->nohdr = 0;
atomic_set(&skb_shinfo(skb)->dataref, 1);
return 0;
nodata:
return -ENOMEM;
}
+EXPORT_SYMBOL(pskb_expand_head);
/* Make private copy of skb with writable head and some headroom */
}
return skb2;
}
-
+EXPORT_SYMBOL(skb_realloc_headroom);
/**
* skb_copy_expand - copy and expand sk_buff
*
* You must pass %GFP_ATOMIC as the allocation priority if this function
* is called from an interrupt.
- *
- * BUG ALERT: ip_summed is not copied. Why does this work? Is it used
- * only by netfilter in the cases when checksum is recalculated? --ANK
*/
struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
int newheadroom, int newtailroom,
gfp_mask);
int oldheadroom = skb_headroom(skb);
int head_copy_len, head_copy_off;
- int off = 0;
+ int off;
if (!n)
return NULL;
copy_skb_header(n, skb);
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
off = newheadroom - oldheadroom;
-#endif
+ n->csum_start += off;
+#ifdef NET_SKBUFF_DATA_USES_OFFSET
n->transport_header += off;
n->network_header += off;
n->mac_header += off;
+#endif
return n;
}
+EXPORT_SYMBOL(skb_copy_expand);
/**
* skb_pad - zero pad the tail of an skb
kfree_skb(skb);
return err;
}
+EXPORT_SYMBOL(skb_pad);
+
+/**
+ * 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.
+ */
+unsigned char *skb_put(struct sk_buff *skb, unsigned int len)
+{
+ unsigned char *tmp = skb_tail_pointer(skb);
+ SKB_LINEAR_ASSERT(skb);
+ skb->tail += len;
+ skb->len += len;
+ if (unlikely(skb->tail > skb->end))
+ skb_over_panic(skb, len, __builtin_return_address(0));
+ return tmp;
+}
+EXPORT_SYMBOL(skb_put);
+
+/**
+ * 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.
+ */
+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, __builtin_return_address(0));
+ return skb->data;
+}
+EXPORT_SYMBOL(skb_push);
+
+/**
+ * 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.
+ */
+unsigned char *skb_pull(struct sk_buff *skb, unsigned int len)
+{
+ return unlikely(len > skb->len) ? NULL : __skb_pull(skb, len);
+}
+EXPORT_SYMBOL(skb_pull);
+
+/**
+ * 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.
+ * The skb must be linear.
+ */
+void skb_trim(struct sk_buff *skb, unsigned int len)
+{
+ if (skb->len > len)
+ __skb_trim(skb, len);
+}
+EXPORT_SYMBOL(skb_trim);
/* Trims skb to length len. It can change skb pointers.
*/
return 0;
}
+EXPORT_SYMBOL(___pskb_trim);
/**
* __pskb_pull_tail - advance tail of skb header
insp = list;
}
if (!pskb_pull(list, eat)) {
- if (clone)
- kfree_skb(clone);
+ kfree_skb(clone);
return NULL;
}
break;
return skb_tail_pointer(skb);
}
+EXPORT_SYMBOL(__pskb_pull_tail);
/* Copy some data bits from skb to kernel buffer. */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
+
+ end = start + skb_shinfo(skb)->frags[i].size;
+ if ((copy = end - offset) > 0) {
+ u8 *vaddr;
+
+ if (copy > len)
+ copy = len;
+
+ vaddr = kmap_skb_frag(&skb_shinfo(skb)->frags[i]);
+ memcpy(to,
+ vaddr + skb_shinfo(skb)->frags[i].page_offset+
+ offset - start, copy);
+ kunmap_skb_frag(vaddr);
+
+ if ((len -= copy) == 0)
+ return 0;
+ offset += copy;
+ to += copy;
+ }
+ start = end;
+ }
+
+ if (skb_shinfo(skb)->frag_list) {
+ struct sk_buff *list = skb_shinfo(skb)->frag_list;
+
+ for (; list; list = list->next) {
+ int end;
+
+ WARN_ON(start > offset + len);
+
+ end = start + list->len;
+ if ((copy = end - offset) > 0) {
+ if (copy > len)
+ copy = len;
+ if (skb_copy_bits(list, offset - start,
+ to, copy))
+ goto fault;
+ if ((len -= copy) == 0)
+ return 0;
+ offset += copy;
+ to += copy;
+ }
+ start = end;
+ }
+ }
+ if (!len)
+ return 0;
+
+fault:
+ return -EFAULT;
+}
+EXPORT_SYMBOL(skb_copy_bits);
+
+/*
+ * Callback from splice_to_pipe(), if we need to release some pages
+ * at the end of the spd in case we error'ed out in filling the pipe.
+ */
+static void sock_spd_release(struct splice_pipe_desc *spd, unsigned int i)
+{
+ put_page(spd->pages[i]);
+}
+
+static inline struct page *linear_to_page(struct page *page, unsigned int *len,
+ unsigned int *offset,
+ struct sk_buff *skb, struct sock *sk)
+{
+ struct page *p = sk->sk_sndmsg_page;
+ unsigned int off;
+
+ if (!p) {
+new_page:
+ p = sk->sk_sndmsg_page = alloc_pages(sk->sk_allocation, 0);
+ if (!p)
+ return NULL;
+
+ off = sk->sk_sndmsg_off = 0;
+ /* hold one ref to this page until it's full */
+ } else {
+ unsigned int mlen;
+
+ off = sk->sk_sndmsg_off;
+ mlen = PAGE_SIZE - off;
+ if (mlen < 64 && mlen < *len) {
+ put_page(p);
+ goto new_page;
+ }
+
+ *len = min_t(unsigned int, *len, mlen);
+ }
+
+ memcpy(page_address(p) + off, page_address(page) + *offset, *len);
+ sk->sk_sndmsg_off += *len;
+ *offset = off;
+ get_page(p);
+
+ return p;
+}
+
+/*
+ * Fill page/offset/length into spd, if it can hold more pages.
+ */
+static inline int spd_fill_page(struct splice_pipe_desc *spd, struct page *page,
+ unsigned int *len, unsigned int offset,
+ struct sk_buff *skb, int linear,
+ struct sock *sk)
+{
+ if (unlikely(spd->nr_pages == PIPE_BUFFERS))
+ return 1;
+
+ if (linear) {
+ page = linear_to_page(page, len, &offset, skb, sk);
+ if (!page)
+ return 1;
+ } else
+ get_page(page);
+
+ spd->pages[spd->nr_pages] = page;
+ spd->partial[spd->nr_pages].len = *len;
+ spd->partial[spd->nr_pages].offset = offset;
+ spd->nr_pages++;
+
+ return 0;
+}
+
+static inline void __segment_seek(struct page **page, unsigned int *poff,
+ unsigned int *plen, unsigned int off)
+{
+ unsigned long n;
+
+ *poff += off;
+ n = *poff / PAGE_SIZE;
+ if (n)
+ *page = nth_page(*page, n);
+
+ *poff = *poff % PAGE_SIZE;
+ *plen -= off;
+}
+
+static inline int __splice_segment(struct page *page, unsigned int poff,
+ unsigned int plen, unsigned int *off,
+ unsigned int *len, struct sk_buff *skb,
+ struct splice_pipe_desc *spd, int linear,
+ struct sock *sk)
+{
+ if (!*len)
+ return 1;
+
+ /* skip this segment if already processed */
+ if (*off >= plen) {
+ *off -= plen;
+ return 0;
+ }
+
+ /* ignore any bits we already processed */
+ if (*off) {
+ __segment_seek(&page, &poff, &plen, *off);
+ *off = 0;
+ }
+
+ do {
+ unsigned int flen = min(*len, plen);
+
+ /* the linear region may spread across several pages */
+ flen = min_t(unsigned int, flen, PAGE_SIZE - poff);
+
+ if (spd_fill_page(spd, page, &flen, poff, skb, linear, sk))
+ return 1;
+
+ __segment_seek(&page, &poff, &plen, flen);
+ *len -= flen;
+
+ } while (*len && plen);
+
+ return 0;
+}
+
+/*
+ * Map linear and fragment data from the skb to spd. It reports failure if the
+ * pipe is full or if we already spliced the requested length.
+ */
+static int __skb_splice_bits(struct sk_buff *skb, unsigned int *offset,
+ unsigned int *len, struct splice_pipe_desc *spd,
+ struct sock *sk)
+{
+ int seg;
+
+ /*
+ * map the linear part
+ */
+ if (__splice_segment(virt_to_page(skb->data),
+ (unsigned long) skb->data & (PAGE_SIZE - 1),
+ skb_headlen(skb),
+ offset, len, skb, spd, 1, sk))
+ return 1;
+
+ /*
+ * then map the fragments
+ */
+ for (seg = 0; seg < skb_shinfo(skb)->nr_frags; seg++) {
+ const skb_frag_t *f = &skb_shinfo(skb)->frags[seg];
- end = start + skb_shinfo(skb)->frags[i].size;
- if ((copy = end - offset) > 0) {
- u8 *vaddr;
+ if (__splice_segment(f->page, f->page_offset, f->size,
+ offset, len, skb, spd, 0, sk))
+ return 1;
+ }
- if (copy > len)
- copy = len;
+ return 0;
+}
- vaddr = kmap_skb_frag(&skb_shinfo(skb)->frags[i]);
- memcpy(to,
- vaddr + skb_shinfo(skb)->frags[i].page_offset+
- offset - start, copy);
- kunmap_skb_frag(vaddr);
+/*
+ * Map data from the skb to a pipe. Should handle both the linear part,
+ * the fragments, and the frag list. It does NOT handle frag lists within
+ * the frag list, if such a thing exists. We'd probably need to recurse to
+ * handle that cleanly.
+ */
+int skb_splice_bits(struct sk_buff *skb, unsigned int offset,
+ struct pipe_inode_info *pipe, unsigned int tlen,
+ unsigned int flags)
+{
+ struct partial_page partial[PIPE_BUFFERS];
+ struct page *pages[PIPE_BUFFERS];
+ struct splice_pipe_desc spd = {
+ .pages = pages,
+ .partial = partial,
+ .flags = flags,
+ .ops = &sock_pipe_buf_ops,
+ .spd_release = sock_spd_release,
+ };
+ struct sock *sk = skb->sk;
- if ((len -= copy) == 0)
- return 0;
- offset += copy;
- to += copy;
- }
- start = end;
- }
+ /*
+ * __skb_splice_bits() only fails if the output has no room left,
+ * so no point in going over the frag_list for the error case.
+ */
+ if (__skb_splice_bits(skb, &offset, &tlen, &spd, sk))
+ goto done;
+ else if (!tlen)
+ goto done;
+ /*
+ * now see if we have a frag_list to map
+ */
if (skb_shinfo(skb)->frag_list) {
struct sk_buff *list = skb_shinfo(skb)->frag_list;
- for (; list; list = list->next) {
- int end;
-
- BUG_TRAP(start <= offset + len);
-
- end = start + list->len;
- if ((copy = end - offset) > 0) {
- if (copy > len)
- copy = len;
- if (skb_copy_bits(list, offset - start,
- to, copy))
- goto fault;
- if ((len -= copy) == 0)
- return 0;
- offset += copy;
- to += copy;
- }
- start = end;
+ for (; list && tlen; list = list->next) {
+ if (__skb_splice_bits(list, &offset, &tlen, &spd, sk))
+ break;
}
}
- if (!len)
- return 0;
-fault:
- return -EFAULT;
+done:
+ if (spd.nr_pages) {
+ int ret;
+
+ /*
+ * Drop the socket lock, otherwise we have reverse
+ * locking dependencies between sk_lock and i_mutex
+ * here as compared to sendfile(). We enter here
+ * with the socket lock held, and splice_to_pipe() will
+ * grab the pipe inode lock. For sendfile() emulation,
+ * we call into ->sendpage() with the i_mutex lock held
+ * and networking will grab the socket lock.
+ */
+ release_sock(sk);
+ ret = splice_to_pipe(pipe, &spd);
+ lock_sock(sk);
+ return ret;
+ }
+
+ return 0;
}
/**
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
end = start + frag->size;
if ((copy = end - offset) > 0) {
for (; list; list = list->next) {
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
end = start + list->len;
if ((copy = end - offset) > 0) {
fault:
return -EFAULT;
}
-
EXPORT_SYMBOL(skb_store_bits);
/* Checksum skb data. */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
end = start + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
for (; list; list = list->next) {
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
end = start + list->len;
if ((copy = end - offset) > 0) {
return csum;
}
+EXPORT_SYMBOL(skb_checksum);
/* Both of above in one bottle. */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
end = start + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
__wsum csum2;
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
end = start + list->len;
if ((copy = end - offset) > 0) {
BUG_ON(len);
return csum;
}
+EXPORT_SYMBOL(skb_copy_and_csum_bits);
void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
{
*((__sum16 *)(to + csstuff)) = csum_fold(csum);
}
}
+EXPORT_SYMBOL(skb_copy_and_csum_dev);
/**
* skb_dequeue - remove from the head of the queue
spin_unlock_irqrestore(&list->lock, flags);
return result;
}
+EXPORT_SYMBOL(skb_dequeue);
/**
* skb_dequeue_tail - remove from the tail of the queue
spin_unlock_irqrestore(&list->lock, flags);
return result;
}
+EXPORT_SYMBOL(skb_dequeue_tail);
/**
* skb_queue_purge - empty a list
while ((skb = skb_dequeue(list)) != NULL)
kfree_skb(skb);
}
+EXPORT_SYMBOL(skb_queue_purge);
/**
* skb_queue_head - queue a buffer at the list head
__skb_queue_head(list, newsk);
spin_unlock_irqrestore(&list->lock, flags);
}
+EXPORT_SYMBOL(skb_queue_head);
/**
* skb_queue_tail - queue a buffer at the list tail
__skb_queue_tail(list, newsk);
spin_unlock_irqrestore(&list->lock, flags);
}
+EXPORT_SYMBOL(skb_queue_tail);
/**
* skb_unlink - remove a buffer from a list
__skb_unlink(skb, list);
spin_unlock_irqrestore(&list->lock, flags);
}
+EXPORT_SYMBOL(skb_unlink);
/**
* skb_append - append a buffer
unsigned long flags;
spin_lock_irqsave(&list->lock, flags);
- __skb_append(old, newsk, list);
+ __skb_queue_after(list, old, newsk);
spin_unlock_irqrestore(&list->lock, flags);
}
-
+EXPORT_SYMBOL(skb_append);
/**
* skb_insert - insert a buffer
__skb_insert(newsk, old->prev, old, list);
spin_unlock_irqrestore(&list->lock, flags);
}
+EXPORT_SYMBOL(skb_insert);
static inline void skb_split_inside_header(struct sk_buff *skb,
struct sk_buff* skb1,
else /* Second chunk has no header, nothing to copy. */
skb_split_no_header(skb, skb1, len, pos);
}
+EXPORT_SYMBOL(skb_split);
+
+/* Shifting from/to a cloned skb is a no-go.
+ *
+ * Caller cannot keep skb_shinfo related pointers past calling here!
+ */
+static int skb_prepare_for_shift(struct sk_buff *skb)
+{
+ return skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
+}
+
+/**
+ * skb_shift - Shifts paged data partially from skb to another
+ * @tgt: buffer into which tail data gets added
+ * @skb: buffer from which the paged data comes from
+ * @shiftlen: shift up to this many bytes
+ *
+ * Attempts to shift up to shiftlen worth of bytes, which may be less than
+ * the length of the skb, from tgt to skb. Returns number bytes shifted.
+ * It's up to caller to free skb if everything was shifted.
+ *
+ * If @tgt runs out of frags, the whole operation is aborted.
+ *
+ * Skb cannot include anything else but paged data while tgt is allowed
+ * to have non-paged data as well.
+ *
+ * TODO: full sized shift could be optimized but that would need
+ * specialized skb free'er to handle frags without up-to-date nr_frags.
+ */
+int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen)
+{
+ int from, to, merge, todo;
+ struct skb_frag_struct *fragfrom, *fragto;
+
+ BUG_ON(shiftlen > skb->len);
+ BUG_ON(skb_headlen(skb)); /* Would corrupt stream */
+
+ todo = shiftlen;
+ from = 0;
+ to = skb_shinfo(tgt)->nr_frags;
+ fragfrom = &skb_shinfo(skb)->frags[from];
+
+ /* Actual merge is delayed until the point when we know we can
+ * commit all, so that we don't have to undo partial changes
+ */
+ if (!to ||
+ !skb_can_coalesce(tgt, to, fragfrom->page, fragfrom->page_offset)) {
+ merge = -1;
+ } else {
+ merge = to - 1;
+
+ todo -= fragfrom->size;
+ if (todo < 0) {
+ if (skb_prepare_for_shift(skb) ||
+ skb_prepare_for_shift(tgt))
+ return 0;
+
+ /* All previous frag pointers might be stale! */
+ fragfrom = &skb_shinfo(skb)->frags[from];
+ fragto = &skb_shinfo(tgt)->frags[merge];
+
+ fragto->size += shiftlen;
+ fragfrom->size -= shiftlen;
+ fragfrom->page_offset += shiftlen;
+
+ goto onlymerged;
+ }
+
+ from++;
+ }
+
+ /* Skip full, not-fitting skb to avoid expensive operations */
+ if ((shiftlen == skb->len) &&
+ (skb_shinfo(skb)->nr_frags - from) > (MAX_SKB_FRAGS - to))
+ return 0;
+
+ if (skb_prepare_for_shift(skb) || skb_prepare_for_shift(tgt))
+ return 0;
+
+ while ((todo > 0) && (from < skb_shinfo(skb)->nr_frags)) {
+ if (to == MAX_SKB_FRAGS)
+ return 0;
+
+ fragfrom = &skb_shinfo(skb)->frags[from];
+ fragto = &skb_shinfo(tgt)->frags[to];
+
+ if (todo >= fragfrom->size) {
+ *fragto = *fragfrom;
+ todo -= fragfrom->size;
+ from++;
+ to++;
+
+ } else {
+ get_page(fragfrom->page);
+ fragto->page = fragfrom->page;
+ fragto->page_offset = fragfrom->page_offset;
+ fragto->size = todo;
+
+ fragfrom->page_offset += todo;
+ fragfrom->size -= todo;
+ todo = 0;
+
+ to++;
+ break;
+ }
+ }
+
+ /* Ready to "commit" this state change to tgt */
+ skb_shinfo(tgt)->nr_frags = to;
+
+ if (merge >= 0) {
+ fragfrom = &skb_shinfo(skb)->frags[0];
+ fragto = &skb_shinfo(tgt)->frags[merge];
+
+ fragto->size += fragfrom->size;
+ put_page(fragfrom->page);
+ }
+
+ /* Reposition in the original skb */
+ to = 0;
+ while (from < skb_shinfo(skb)->nr_frags)
+ skb_shinfo(skb)->frags[to++] = skb_shinfo(skb)->frags[from++];
+ skb_shinfo(skb)->nr_frags = to;
+
+ BUG_ON(todo > 0 && !skb_shinfo(skb)->nr_frags);
+
+onlymerged:
+ /* Most likely the tgt won't ever need its checksum anymore, skb on
+ * the other hand might need it if it needs to be resent
+ */
+ tgt->ip_summed = CHECKSUM_PARTIAL;
+ skb->ip_summed = CHECKSUM_PARTIAL;
+
+ /* Yak, is it really working this way? Some helper please? */
+ skb->len -= shiftlen;
+ skb->data_len -= shiftlen;
+ skb->truesize -= shiftlen;
+ tgt->len += shiftlen;
+ tgt->data_len += shiftlen;
+ tgt->truesize += shiftlen;
+
+ return shiftlen;
+}
/**
* skb_prepare_seq_read - Prepare a sequential read of skb data
st->frag_idx = st->stepped_offset = 0;
st->frag_data = NULL;
}
+EXPORT_SYMBOL(skb_prepare_seq_read);
/**
* skb_seq_read - Sequentially read skb data
* of bytes already consumed and the next call to
* skb_seq_read() will return the remaining part of the block.
*
- * Note: The size of each block of data returned can be arbitary,
+ * Note 1: The size of each block of data returned can be arbitary,
* this limitation is the cost for zerocopy seqeuental
* reads of potentially non linear data.
*
- * Note: Fragment lists within fragments are not implemented
+ * Note 2: Fragment lists within fragments are not implemented
* at the moment, state->root_skb could be replaced with
* a stack for this purpose.
*/
return 0;
next_skb:
- block_limit = skb_headlen(st->cur_skb);
+ block_limit = skb_headlen(st->cur_skb) + st->stepped_offset;
- if (abs_offset < block_limit) {
- *data = st->cur_skb->data + abs_offset;
+ if (abs_offset < block_limit && !st->frag_data) {
+ *data = st->cur_skb->data + (abs_offset - st->stepped_offset);
return block_limit - abs_offset;
}
st->stepped_offset += frag->size;
}
- if (st->cur_skb->next) {
- st->cur_skb = st->cur_skb->next;
+ if (st->frag_data) {
+ kunmap_skb_frag(st->frag_data);
+ st->frag_data = NULL;
+ }
+
+ if (st->root_skb == st->cur_skb &&
+ skb_shinfo(st->root_skb)->frag_list) {
+ st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
st->frag_idx = 0;
goto next_skb;
- } else if (st->root_skb == st->cur_skb &&
- skb_shinfo(st->root_skb)->frag_list) {
- st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
+ } else if (st->cur_skb->next) {
+ st->cur_skb = st->cur_skb->next;
+ st->frag_idx = 0;
goto next_skb;
}
return 0;
}
+EXPORT_SYMBOL(skb_seq_read);
/**
* skb_abort_seq_read - Abort a sequential read of skb data
if (st->frag_data)
kunmap_skb_frag(st->frag_data);
}
+EXPORT_SYMBOL(skb_abort_seq_read);
#define TS_SKB_CB(state) ((struct skb_seq_state *) &((state)->cb))
ret = textsearch_find(config, state);
return (ret <= to - from ? ret : UINT_MAX);
}
+EXPORT_SYMBOL(skb_find_text);
/**
* skb_append_datato_frags: - append the user data to a skb
return 0;
}
+EXPORT_SYMBOL(skb_append_datato_frags);
/**
* skb_pull_rcsum - pull skb and update receive checksum
* @skb: buffer to update
- * @start: start of data before pull
* @len: length of data pulled
*
* This function performs an skb_pull on the packet and updates
- * update the CHECKSUM_COMPLETE checksum. It should be used on
+ * the CHECKSUM_COMPLETE checksum. It should be used on
* receive path processing instead of skb_pull unless you know
* that the checksum difference is zero (e.g., a valid IP header)
* or you are setting ip_summed to CHECKSUM_NONE.
* @features: features for the output path (see dev->features)
*
* This function performs segmentation on the given skb. It returns
- * the segment at the given position. It returns NULL if there are
- * no more segments to generate, or when an error is encountered.
+ * a pointer to the first in a list of new skbs for the segments.
+ * In case of error it returns ERR_PTR(err).
*/
struct sk_buff *skb_segment(struct sk_buff *skb, int features)
{
struct sk_buff *segs = NULL;
struct sk_buff *tail = NULL;
+ struct sk_buff *fskb = skb_shinfo(skb)->frag_list;
unsigned int mss = skb_shinfo(skb)->gso_size;
unsigned int doffset = skb->data - skb_mac_header(skb);
unsigned int offset = doffset;
struct sk_buff *nskb;
skb_frag_t *frag;
int hsize;
- int k;
int size;
len = skb->len - offset;
if (hsize > len || !sg)
hsize = len;
- nskb = alloc_skb(hsize + doffset + headroom, GFP_ATOMIC);
- if (unlikely(!nskb))
- goto err;
+ if (!hsize && i >= nfrags) {
+ BUG_ON(fskb->len != len);
+
+ pos += len;
+ nskb = skb_clone(fskb, GFP_ATOMIC);
+ fskb = fskb->next;
+
+ if (unlikely(!nskb))
+ goto err;
+
+ hsize = skb_end_pointer(nskb) - nskb->head;
+ if (skb_cow_head(nskb, doffset + headroom)) {
+ kfree_skb(nskb);
+ goto err;
+ }
+
+ nskb->truesize += skb_end_pointer(nskb) - nskb->head -
+ hsize;
+ skb_release_head_state(nskb);
+ __skb_push(nskb, doffset);
+ } else {
+ nskb = alloc_skb(hsize + doffset + headroom,
+ GFP_ATOMIC);
+
+ if (unlikely(!nskb))
+ goto err;
+
+ skb_reserve(nskb, headroom);
+ __skb_put(nskb, doffset);
+ }
if (segs)
tail->next = nskb;
segs = nskb;
tail = nskb;
- nskb->dev = skb->dev;
- nskb->priority = skb->priority;
- nskb->protocol = skb->protocol;
- nskb->dst = dst_clone(skb->dst);
- memcpy(nskb->cb, skb->cb, sizeof(skb->cb));
- nskb->pkt_type = skb->pkt_type;
+ __copy_skb_header(nskb, skb);
nskb->mac_len = skb->mac_len;
- skb_reserve(nskb, headroom);
skb_reset_mac_header(nskb);
skb_set_network_header(nskb, skb->mac_len);
nskb->transport_header = (nskb->network_header +
skb_network_header_len(skb));
- skb_copy_from_linear_data(skb, skb_put(nskb, doffset),
- doffset);
+ skb_copy_from_linear_data(skb, nskb->data, doffset);
+
+ if (fskb != skb_shinfo(skb)->frag_list)
+ continue;
+
if (!sg) {
+ nskb->ip_summed = CHECKSUM_NONE;
nskb->csum = skb_copy_and_csum_bits(skb, offset,
skb_put(nskb, len),
len, 0);
}
frag = skb_shinfo(nskb)->frags;
- k = 0;
- nskb->ip_summed = CHECKSUM_PARTIAL;
- nskb->csum = skb->csum;
skb_copy_from_linear_data_offset(skb, offset,
skb_put(nskb, hsize), hsize);
- while (pos < offset + len) {
- BUG_ON(i >= nfrags);
-
+ while (pos < offset + len && i < nfrags) {
*frag = skb_shinfo(skb)->frags[i];
get_page(frag->page);
size = frag->size;
frag->size -= offset - pos;
}
- k++;
+ skb_shinfo(nskb)->nr_frags++;
if (pos + size <= offset + len) {
i++;
pos += size;
} else {
frag->size -= pos + size - (offset + len);
- break;
+ goto skip_fraglist;
}
frag++;
}
- skb_shinfo(nskb)->nr_frags = k;
+ if (pos < offset + len) {
+ struct sk_buff *fskb2 = fskb;
+
+ BUG_ON(pos + fskb->len != offset + len);
+
+ pos += fskb->len;
+ fskb = fskb->next;
+
+ if (fskb2->next) {
+ fskb2 = skb_clone(fskb2, GFP_ATOMIC);
+ if (!fskb2)
+ goto err;
+ } else
+ skb_get(fskb2);
+
+ BUG_ON(skb_shinfo(nskb)->frag_list);
+ skb_shinfo(nskb)->frag_list = fskb2;
+ }
+
+skip_fraglist:
nskb->data_len = len - hsize;
nskb->len += nskb->data_len;
nskb->truesize += nskb->data_len;
}
return ERR_PTR(err);
}
-
EXPORT_SYMBOL_GPL(skb_segment);
+int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
+{
+ struct sk_buff *p = *head;
+ struct sk_buff *nskb;
+ unsigned int headroom;
+ unsigned int len = skb_gro_len(skb);
+
+ if (p->len + len >= 65536)
+ return -E2BIG;
+
+ if (skb_shinfo(p)->frag_list)
+ goto merge;
+ else if (skb_headlen(skb) <= skb_gro_offset(skb)) {
+ if (skb_shinfo(p)->nr_frags + skb_shinfo(skb)->nr_frags >
+ MAX_SKB_FRAGS)
+ return -E2BIG;
+
+ skb_shinfo(skb)->frags[0].page_offset +=
+ skb_gro_offset(skb) - skb_headlen(skb);
+ skb_shinfo(skb)->frags[0].size -=
+ skb_gro_offset(skb) - skb_headlen(skb);
+
+ memcpy(skb_shinfo(p)->frags + skb_shinfo(p)->nr_frags,
+ skb_shinfo(skb)->frags,
+ skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
+
+ skb_shinfo(p)->nr_frags += skb_shinfo(skb)->nr_frags;
+ skb_shinfo(skb)->nr_frags = 0;
+
+ skb->truesize -= skb->data_len;
+ skb->len -= skb->data_len;
+ skb->data_len = 0;
+
+ NAPI_GRO_CB(skb)->free = 1;
+ goto done;
+ }
+
+ headroom = skb_headroom(p);
+ nskb = netdev_alloc_skb(p->dev, headroom + skb_gro_offset(p));
+ if (unlikely(!nskb))
+ return -ENOMEM;
+
+ __copy_skb_header(nskb, p);
+ nskb->mac_len = p->mac_len;
+
+ skb_reserve(nskb, headroom);
+ __skb_put(nskb, skb_gro_offset(p));
+
+ skb_set_mac_header(nskb, skb_mac_header(p) - p->data);
+ skb_set_network_header(nskb, skb_network_offset(p));
+ skb_set_transport_header(nskb, skb_transport_offset(p));
+
+ __skb_pull(p, skb_gro_offset(p));
+ memcpy(skb_mac_header(nskb), skb_mac_header(p),
+ p->data - skb_mac_header(p));
+
+ *NAPI_GRO_CB(nskb) = *NAPI_GRO_CB(p);
+ skb_shinfo(nskb)->frag_list = p;
+ skb_shinfo(nskb)->gso_size = skb_shinfo(p)->gso_size;
+ skb_header_release(p);
+ nskb->prev = p;
+
+ nskb->data_len += p->len;
+ nskb->truesize += p->len;
+ nskb->len += p->len;
+
+ *head = nskb;
+ nskb->next = p->next;
+ p->next = NULL;
+
+ p = nskb;
+
+merge:
+ if (skb_gro_offset(skb) > skb_headlen(skb)) {
+ skb_shinfo(skb)->frags[0].page_offset +=
+ skb_gro_offset(skb) - skb_headlen(skb);
+ skb_shinfo(skb)->frags[0].size -=
+ skb_gro_offset(skb) - skb_headlen(skb);
+ skb_gro_reset_offset(skb);
+ skb_gro_pull(skb, skb_headlen(skb));
+ }
+
+ __skb_pull(skb, skb_gro_offset(skb));
+
+ p->prev->next = skb;
+ p->prev = skb;
+ skb_header_release(skb);
+
+done:
+ NAPI_GRO_CB(p)->count++;
+ p->data_len += len;
+ p->truesize += len;
+ p->len += len;
+
+ NAPI_GRO_CB(skb)->same_flow = 1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(skb_gro_receive);
+
void __init skb_init(void)
{
skbuff_head_cache = kmem_cache_create("skbuff_head_cache",
sizeof(struct sk_buff),
0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC,
- NULL, NULL);
+ NULL);
skbuff_fclone_cache = kmem_cache_create("skbuff_fclone_cache",
(2*sizeof(struct sk_buff)) +
sizeof(atomic_t),
0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC,
- NULL, NULL);
+ NULL);
}
/**
* Fill the specified scatter-gather list with mappings/pointers into a
* region of the buffer space attached to a socket buffer.
*/
-int
-skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
+static int
+__skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
{
int start = skb_headlen(skb);
int i, copy = start - offset;
if (copy > 0) {
if (copy > len)
copy = len;
- sg[elt].page = virt_to_page(skb->data + offset);
- sg[elt].offset = (unsigned long)(skb->data + offset) % PAGE_SIZE;
- sg[elt].length = copy;
+ sg_set_buf(sg, skb->data + offset, copy);
elt++;
if ((len -= copy) == 0)
return elt;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
end = start + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
- sg[elt].page = frag->page;
- sg[elt].offset = frag->page_offset+offset-start;
- sg[elt].length = copy;
+ sg_set_page(&sg[elt], frag->page, copy,
+ frag->page_offset+offset-start);
elt++;
if (!(len -= copy))
return elt;
for (; list; list = list->next) {
int end;
- BUG_TRAP(start <= offset + len);
+ WARN_ON(start > offset + len);
end = start + list->len;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
- elt += skb_to_sgvec(list, sg+elt, offset - start, copy);
+ elt += __skb_to_sgvec(list, sg+elt, offset - start,
+ copy);
if ((len -= copy) == 0)
return elt;
offset += copy;
return elt;
}
+int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
+{
+ int nsg = __skb_to_sgvec(skb, sg, offset, len);
+
+ sg_mark_end(&sg[nsg - 1]);
+
+ return nsg;
+}
+EXPORT_SYMBOL_GPL(skb_to_sgvec);
+
/**
* skb_cow_data - Check that a socket buffer's data buffers are writable
* @skb: The socket buffer to check.
return elt;
}
+EXPORT_SYMBOL_GPL(skb_cow_data);
-EXPORT_SYMBOL(___pskb_trim);
-EXPORT_SYMBOL(__kfree_skb);
-EXPORT_SYMBOL(kfree_skb);
-EXPORT_SYMBOL(__pskb_pull_tail);
-EXPORT_SYMBOL(__alloc_skb);
-EXPORT_SYMBOL(__netdev_alloc_skb);
-EXPORT_SYMBOL(pskb_copy);
-EXPORT_SYMBOL(pskb_expand_head);
-EXPORT_SYMBOL(skb_checksum);
-EXPORT_SYMBOL(skb_clone);
-EXPORT_SYMBOL(skb_clone_fraglist);
-EXPORT_SYMBOL(skb_copy);
-EXPORT_SYMBOL(skb_copy_and_csum_bits);
-EXPORT_SYMBOL(skb_copy_and_csum_dev);
-EXPORT_SYMBOL(skb_copy_bits);
-EXPORT_SYMBOL(skb_copy_expand);
-EXPORT_SYMBOL(skb_over_panic);
-EXPORT_SYMBOL(skb_pad);
-EXPORT_SYMBOL(skb_realloc_headroom);
-EXPORT_SYMBOL(skb_under_panic);
-EXPORT_SYMBOL(skb_dequeue);
-EXPORT_SYMBOL(skb_dequeue_tail);
-EXPORT_SYMBOL(skb_insert);
-EXPORT_SYMBOL(skb_queue_purge);
-EXPORT_SYMBOL(skb_queue_head);
-EXPORT_SYMBOL(skb_queue_tail);
-EXPORT_SYMBOL(skb_unlink);
-EXPORT_SYMBOL(skb_append);
-EXPORT_SYMBOL(skb_split);
-EXPORT_SYMBOL(skb_prepare_seq_read);
-EXPORT_SYMBOL(skb_seq_read);
-EXPORT_SYMBOL(skb_abort_seq_read);
-EXPORT_SYMBOL(skb_find_text);
-EXPORT_SYMBOL(skb_append_datato_frags);
+void skb_tstamp_tx(struct sk_buff *orig_skb,
+ struct skb_shared_hwtstamps *hwtstamps)
+{
+ struct sock *sk = orig_skb->sk;
+ struct sock_exterr_skb *serr;
+ struct sk_buff *skb;
+ int err;
-EXPORT_SYMBOL_GPL(skb_to_sgvec);
-EXPORT_SYMBOL_GPL(skb_cow_data);
+ if (!sk)
+ return;
+
+ skb = skb_clone(orig_skb, GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ if (hwtstamps) {
+ *skb_hwtstamps(skb) =
+ *hwtstamps;
+ } else {
+ /*
+ * no hardware time stamps available,
+ * so keep the skb_shared_tx and only
+ * store software time stamp
+ */
+ skb->tstamp = ktime_get_real();
+ }
+
+ serr = SKB_EXT_ERR(skb);
+ memset(serr, 0, sizeof(*serr));
+ serr->ee.ee_errno = ENOMSG;
+ serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
+ err = sock_queue_err_skb(sk, skb);
+ if (err)
+ kfree_skb(skb);
+}
+EXPORT_SYMBOL_GPL(skb_tstamp_tx);
+
+
+/**
+ * skb_partial_csum_set - set up and verify partial csum values for packet
+ * @skb: the skb to set
+ * @start: the number of bytes after skb->data to start checksumming.
+ * @off: the offset from start to place the checksum.
+ *
+ * For untrusted partially-checksummed packets, we need to make sure the values
+ * for skb->csum_start and skb->csum_offset are valid so we don't oops.
+ *
+ * This function checks and sets those values and skb->ip_summed: if this
+ * returns false you should drop the packet.
+ */
+bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off)
+{
+ if (unlikely(start > skb->len - 2) ||
+ unlikely((int)start + off > skb->len - 2)) {
+ if (net_ratelimit())
+ printk(KERN_WARNING
+ "bad partial csum: csum=%u/%u len=%u\n",
+ start, off, skb->len);
+ return false;
+ }
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_start = skb_headroom(skb) + start;
+ skb->csum_offset = off;
+ return true;
+}
+EXPORT_SYMBOL_GPL(skb_partial_csum_set);
+
+void __skb_warn_lro_forwarding(const struct sk_buff *skb)
+{
+ if (net_ratelimit())
+ pr_warning("%s: received packets cannot be forwarded"
+ " while LRO is enabled\n", skb->dev->name);
+}
+EXPORT_SYMBOL(__skb_warn_lro_forwarding);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff