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Diffstat (limited to 'net/xfrm/xfrm_algo.c')
-rw-r--r--net/xfrm/xfrm_algo.c191
1 files changed, 8 insertions, 183 deletions
diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index f373a8a7d9c8..be529c4241a6 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c
@@ -532,8 +532,8 @@ EXPORT_SYMBOL_GPL(xfrm_count_enc_supported);
int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
int offset, int len, icv_update_fn_t icv_update)
{
- int start = skb_headlen(skb);
- int i, copy = start - offset;
+ int end = skb_headlen(skb);
+ int i, copy = end - offset;
int err;
struct scatterlist sg;
@@ -556,11 +556,9 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
}
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- int end;
+ BUG_TRAP(len >= 0);
- BUG_TRAP(start <= offset + len);
-
- end = start + skb_shinfo(skb)->frags[i].size;
+ end = offset + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
@@ -568,7 +566,7 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
copy = len;
sg.page = frag->page;
- sg.offset = frag->page_offset + offset-start;
+ sg.offset = frag->page_offset;
sg.length = copy;
err = icv_update(desc, &sg, copy);
@@ -579,22 +577,19 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
return 0;
offset += 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;
-
- BUG_TRAP(start <= offset + len);
+ BUG_TRAP(len >= 0);
- end = start + list->len;
+ end = offset + list->len;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
- err = skb_icv_walk(list, desc, offset-start,
+ err = skb_icv_walk(list, desc, 0,
copy, icv_update);
if (unlikely(err))
return err;
@@ -602,7 +597,6 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
return 0;
offset += copy;
}
- start = end;
}
}
BUG_ON(len);
@@ -612,175 +606,6 @@ EXPORT_SYMBOL_GPL(skb_icv_walk);
#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
-/* Looking generic it is not used in another places. */
-
-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;
- int elt = 0;
-
- 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;
- elt++;
- if ((len -= copy) == 0)
- return elt;
- offset += copy;
- }
-
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- int end;
-
- BUG_TRAP(start <= offset + len);
-
- end = start + skb_shinfo(skb)->frags[i].size;
- if ((copy = end - offset) > 0) {
- skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
-
- if (copy > len)
- copy = len;
- sg[elt].page = frag->page;
- sg[elt].offset = frag->page_offset+offset-start;
- sg[elt].length = copy;
- elt++;
- if (!(len -= copy))
- return elt;
- offset += 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;
-
- BUG_TRAP(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);
- if ((len -= copy) == 0)
- return elt;
- offset += copy;
- }
- start = end;
- }
- }
- BUG_ON(len);
- return elt;
-}
-EXPORT_SYMBOL_GPL(skb_to_sgvec);
-
-/* Check that skb data bits are writable. If they are not, copy data
- * to newly created private area. If "tailbits" is given, make sure that
- * tailbits bytes beyond current end of skb are writable.
- *
- * Returns amount of elements of scatterlist to load for subsequent
- * transformations and pointer to writable trailer skb.
- */
-
-int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
-{
- int copyflag;
- int elt;
- struct sk_buff *skb1, **skb_p;
-
- /* If skb is cloned or its head is paged, reallocate
- * head pulling out all the pages (pages are considered not writable
- * at the moment even if they are anonymous).
- */
- if ((skb_cloned(skb) || skb_shinfo(skb)->nr_frags) &&
- __pskb_pull_tail(skb, skb_pagelen(skb)-skb_headlen(skb)) == NULL)
- return -ENOMEM;
-
- /* Easy case. Most of packets will go this way. */
- if (!skb_shinfo(skb)->frag_list) {
- /* A little of trouble, not enough of space for trailer.
- * This should not happen, when stack is tuned to generate
- * good frames. OK, on miss we reallocate and reserve even more
- * space, 128 bytes is fair. */
-
- if (skb_tailroom(skb) < tailbits &&
- pskb_expand_head(skb, 0, tailbits-skb_tailroom(skb)+128, GFP_ATOMIC))
- return -ENOMEM;
-
- /* Voila! */
- *trailer = skb;
- return 1;
- }
-
- /* Misery. We are in troubles, going to mincer fragments... */
-
- elt = 1;
- skb_p = &skb_shinfo(skb)->frag_list;
- copyflag = 0;
-
- while ((skb1 = *skb_p) != NULL) {
- int ntail = 0;
-
- /* The fragment is partially pulled by someone,
- * this can happen on input. Copy it and everything
- * after it. */
-
- if (skb_shared(skb1))
- copyflag = 1;
-
- /* If the skb is the last, worry about trailer. */
-
- if (skb1->next == NULL && tailbits) {
- if (skb_shinfo(skb1)->nr_frags ||
- skb_shinfo(skb1)->frag_list ||
- skb_tailroom(skb1) < tailbits)
- ntail = tailbits + 128;
- }
-
- if (copyflag ||
- skb_cloned(skb1) ||
- ntail ||
- skb_shinfo(skb1)->nr_frags ||
- skb_shinfo(skb1)->frag_list) {
- struct sk_buff *skb2;
-
- /* Fuck, we are miserable poor guys... */
- if (ntail == 0)
- skb2 = skb_copy(skb1, GFP_ATOMIC);
- else
- skb2 = skb_copy_expand(skb1,
- skb_headroom(skb1),
- ntail,
- GFP_ATOMIC);
- if (unlikely(skb2 == NULL))
- return -ENOMEM;
-
- if (skb1->sk)
- skb_set_owner_w(skb2, skb1->sk);
-
- /* Looking around. Are we still alive?
- * OK, link new skb, drop old one */
-
- skb2->next = skb1->next;
- *skb_p = skb2;
- kfree_skb(skb1);
- skb1 = skb2;
- }
- elt++;
- *trailer = skb1;
- skb_p = &skb1->next;
- }
-
- return elt;
-}
-EXPORT_SYMBOL_GPL(skb_cow_data);
-
void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len)
{
if (tail != skb) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 08:48:27 +0100