aboutsummaryrefslogtreecommitdiffstats
path: root/net/core/skbuff.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r--net/core/skbuff.c213
1 files changed, 148 insertions, 65 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c6a6b166f8d6..e5e2111a397d 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -55,6 +55,7 @@
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <linux/scatterlist.h>
+#include <linux/errqueue.h>
#include <net/protocol.h>
#include <net/dst.h>
@@ -123,6 +124,7 @@ void skb_over_panic(struct sk_buff *skb, int sz, void *here)
skb->dev ? skb->dev->name : "<NULL>");
BUG();
}
+EXPORT_SYMBOL(skb_over_panic);
/**
* skb_under_panic - private function
@@ -142,6 +144,7 @@ void skb_under_panic(struct sk_buff *skb, int sz, void *here)
skb->dev ? skb->dev->name : "<NULL>");
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
@@ -205,7 +208,9 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
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;
@@ -223,6 +228,7 @@ nodata:
skb = NULL;
goto out;
}
+EXPORT_SYMBOL(__alloc_skb);
/**
* __netdev_alloc_skb - allocate an skbuff for rx on a specific device
@@ -250,6 +256,7 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
}
return skb;
}
+EXPORT_SYMBOL(__netdev_alloc_skb);
struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)
{
@@ -418,6 +425,7 @@ void __kfree_skb(struct sk_buff *skb)
skb_release_all(skb);
kfree_skbmem(skb);
}
+EXPORT_SYMBOL(__kfree_skb);
/**
* kfree_skb - free an sk_buff
@@ -436,6 +444,7 @@ void kfree_skb(struct sk_buff *skb)
return;
__kfree_skb(skb);
}
+EXPORT_SYMBOL(kfree_skb);
/**
* skb_recycle_check - check if skb can be reused for receive
@@ -605,6 +614,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
return __skb_clone(n, skb);
}
+EXPORT_SYMBOL(skb_clone);
static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
{
@@ -671,7 +681,7 @@ struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t gfp_mask)
copy_skb_header(n, skb);
return n;
}
-
+EXPORT_SYMBOL(skb_copy);
/**
* pskb_copy - create copy of an sk_buff with private head.
@@ -730,6 +740,7 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
out:
return n;
}
+EXPORT_SYMBOL(pskb_copy);
/**
* pskb_expand_head - reallocate header of &sk_buff
@@ -813,6 +824,7 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
nodata:
return -ENOMEM;
}
+EXPORT_SYMBOL(pskb_expand_head);
/* Make private copy of skb with writable head and some headroom */
@@ -833,7 +845,7 @@ struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, unsigned int headroom)
}
return skb2;
}
-
+EXPORT_SYMBOL(skb_realloc_headroom);
/**
* skb_copy_expand - copy and expand sk_buff
@@ -898,6 +910,7 @@ struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
return n;
}
+EXPORT_SYMBOL(skb_copy_expand);
/**
* skb_pad - zero pad the tail of an skb
@@ -943,6 +956,7 @@ free_skb:
kfree_skb(skb);
return err;
}
+EXPORT_SYMBOL(skb_pad);
/**
* skb_put - add data to a buffer
@@ -1100,6 +1114,7 @@ done:
return 0;
}
+EXPORT_SYMBOL(___pskb_trim);
/**
* __pskb_pull_tail - advance tail of skb header
@@ -1193,8 +1208,7 @@ unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta)
insp = list;
}
if (!pskb_pull(list, eat)) {
- if (clone)
- kfree_skb(clone);
+ kfree_skb(clone);
return NULL;
}
break;
@@ -1238,6 +1252,7 @@ pull_pages:
return skb_tail_pointer(skb);
}
+EXPORT_SYMBOL(__pskb_pull_tail);
/* Copy some data bits from skb to kernel buffer. */
@@ -1315,6 +1330,7 @@ int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len)
fault:
return -EFAULT;
}
+EXPORT_SYMBOL(skb_copy_bits);
/*
* Callback from splice_to_pipe(), if we need to release some pages
@@ -1325,14 +1341,39 @@ 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)
+static inline struct page *linear_to_page(struct page *page, unsigned int *len,
+ unsigned int *offset,
+ struct sk_buff *skb)
{
- struct page *p = alloc_pages(GFP_KERNEL, 0);
+ struct sock *sk = skb->sk;
+ struct page *p = sk->sk_sndmsg_page;
+ unsigned int off;
- if (!p)
- return NULL;
- memcpy(page_address(p) + offset, page_address(page) + offset, len);
+ 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;
}
@@ -1341,21 +1382,21 @@ static inline struct page *linear_to_page(struct page *page, unsigned int len,
* 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,
+ unsigned int *len, unsigned int offset,
struct sk_buff *skb, int linear)
{
if (unlikely(spd->nr_pages == PIPE_BUFFERS))
return 1;
if (linear) {
- page = linear_to_page(page, len, offset);
+ page = linear_to_page(page, len, &offset, skb);
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].len = *len;
spd->partial[spd->nr_pages].offset = offset;
spd->nr_pages++;
@@ -1365,8 +1406,13 @@ static inline int spd_fill_page(struct splice_pipe_desc *spd, struct page *page,
static inline void __segment_seek(struct page **page, unsigned int *poff,
unsigned int *plen, unsigned int off)
{
+ unsigned long n;
+
*poff += off;
- *page += *poff / PAGE_SIZE;
+ n = *poff / PAGE_SIZE;
+ if (n)
+ *page = nth_page(*page, n);
+
*poff = *poff % PAGE_SIZE;
*plen -= off;
}
@@ -1397,7 +1443,7 @@ static inline int __splice_segment(struct page *page, unsigned int poff,
/* 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))
+ if (spd_fill_page(spd, page, &flen, poff, skb, linear))
return 1;
__segment_seek(&page, &poff, &plen, flen);
@@ -1590,7 +1636,6 @@ int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len)
fault:
return -EFAULT;
}
-
EXPORT_SYMBOL(skb_store_bits);
/* Checksum skb data. */
@@ -1667,6 +1712,7 @@ __wsum skb_checksum(const struct sk_buff *skb, int offset,
return csum;
}
+EXPORT_SYMBOL(skb_checksum);
/* Both of above in one bottle. */
@@ -1748,6 +1794,7 @@ __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset,
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)
{
@@ -1774,6 +1821,7 @@ 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
@@ -1794,6 +1842,7 @@ struct sk_buff *skb_dequeue(struct sk_buff_head *list)
spin_unlock_irqrestore(&list->lock, flags);
return result;
}
+EXPORT_SYMBOL(skb_dequeue);
/**
* skb_dequeue_tail - remove from the tail of the queue
@@ -1813,6 +1862,7 @@ struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list)
spin_unlock_irqrestore(&list->lock, flags);
return result;
}
+EXPORT_SYMBOL(skb_dequeue_tail);
/**
* skb_queue_purge - empty a list
@@ -1828,6 +1878,7 @@ void skb_queue_purge(struct sk_buff_head *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
@@ -1848,6 +1899,7 @@ void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk)
__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
@@ -1868,6 +1920,7 @@ void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk)
__skb_queue_tail(list, newsk);
spin_unlock_irqrestore(&list->lock, flags);
}
+EXPORT_SYMBOL(skb_queue_tail);
/**
* skb_unlink - remove a buffer from a list
@@ -1887,6 +1940,7 @@ void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list)
__skb_unlink(skb, list);
spin_unlock_irqrestore(&list->lock, flags);
}
+EXPORT_SYMBOL(skb_unlink);
/**
* skb_append - append a buffer
@@ -1906,7 +1960,7 @@ void skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head
__skb_queue_after(list, old, newsk);
spin_unlock_irqrestore(&list->lock, flags);
}
-
+EXPORT_SYMBOL(skb_append);
/**
* skb_insert - insert a buffer
@@ -1928,6 +1982,7 @@ void skb_insert(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head
__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,
@@ -2006,6 +2061,7 @@ void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len)
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.
*
@@ -2168,6 +2224,7 @@ void skb_prepare_seq_read(struct sk_buff *skb, unsigned int from,
st->frag_idx = st->stepped_offset = 0;
st->frag_data = NULL;
}
+EXPORT_SYMBOL(skb_prepare_seq_read);
/**
* skb_seq_read - Sequentially read skb data
@@ -2255,6 +2312,7 @@ next_skb:
return 0;
}
+EXPORT_SYMBOL(skb_seq_read);
/**
* skb_abort_seq_read - Abort a sequential read of skb data
@@ -2268,6 +2326,7 @@ void skb_abort_seq_read(struct skb_seq_state *st)
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))
@@ -2310,6 +2369,7 @@ unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
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
@@ -2382,6 +2442,7 @@ int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
return 0;
}
+EXPORT_SYMBOL(skb_append_datato_frags);
/**
* skb_pull_rcsum - pull skb and update receive checksum
@@ -2569,7 +2630,6 @@ err:
}
return ERR_PTR(err);
}
-
EXPORT_SYMBOL_GPL(skb_segment);
int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
@@ -2577,17 +2637,23 @@ 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 hlen = p->data - skb_mac_header(p);
- unsigned int len = skb->len;
+ unsigned int len = skb_gro_len(skb);
- if (hlen + p->len + len >= 65536)
+ if (p->len + len >= 65536)
return -E2BIG;
if (skb_shinfo(p)->frag_list)
goto merge;
- else if (!skb_headlen(p) && !skb_headlen(skb) &&
- skb_shinfo(p)->nr_frags + skb_shinfo(skb)->nr_frags <
- MAX_SKB_FRAGS) {
+ 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));
@@ -2604,7 +2670,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
}
headroom = skb_headroom(p);
- nskb = netdev_alloc_skb(p->dev, headroom);
+ nskb = netdev_alloc_skb(p->dev, headroom + skb_gro_offset(p));
if (unlikely(!nskb))
return -ENOMEM;
@@ -2612,12 +2678,15 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
nskb->mac_len = p->mac_len;
skb_reserve(nskb, headroom);
+ __skb_put(nskb, skb_gro_offset(p));
- skb_set_mac_header(nskb, -hlen);
+ 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));
- memcpy(skb_mac_header(nskb), skb_mac_header(p), hlen);
+ __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;
@@ -2636,6 +2705,17 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
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);
@@ -2747,6 +2827,7 @@ int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int le
return nsg;
}
+EXPORT_SYMBOL_GPL(skb_to_sgvec);
/**
* skb_cow_data - Check that a socket buffer's data buffers are writable
@@ -2856,6 +2937,45 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
return elt;
}
+EXPORT_SYMBOL_GPL(skb_cow_data);
+
+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;
+
+ 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
@@ -2884,6 +3004,7 @@ bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off)
skb->csum_offset = off;
return true;
}
+EXPORT_SYMBOL_GPL(skb_partial_csum_set);
void __skb_warn_lro_forwarding(const struct sk_buff *skb)
{
@@ -2891,42 +3012,4 @@ void __skb_warn_lro_forwarding(const struct sk_buff *skb)
pr_warning("%s: received packets cannot be forwarded"
" while LRO is enabled\n", skb->dev->name);
}
-
-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_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);
EXPORT_SYMBOL(__skb_warn_lro_forwarding);
-
-EXPORT_SYMBOL_GPL(skb_to_sgvec);
-EXPORT_SYMBOL_GPL(skb_cow_data);
-EXPORT_SYMBOL_GPL(skb_partial_csum_set);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.