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net-next: skbuff: refactor pskb_pull 

pskb_may_pull already contains all of the checks performed by
pskb_pull.
Use pskb_may_pull for validation in pskb_pull, eliminating the
duplication and making __pskb_pull obsolete.
Replace __pskb_pull with pskb_pull where applicable.

Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Gobert 2022-09-28 14:55:31 +02:00 committed by David S. Miller
parent 96e0718165
commit d427c8999b
4 changed files with 13 additions and 18 deletions
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23
include/linux/skbuff.h
View File

@ -2616,20 +2616,6 @@ void *skb_pull_data(struct sk_buff *skb, size_t len);
void *__pskb_pull_tail(struct sk_buff *skb, int delta);
static inline void *__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 void *pskb_pull(struct sk_buff *skb, unsigned int len)
{
return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len);
}
static inline bool pskb_may_pull(struct sk_buff *skb, unsigned int len)
{
if (likely(len <= skb_headlen(skb)))
@ -2639,6 +2625,15 @@ static inline bool pskb_may_pull(struct sk_buff *skb, unsigned int len)
return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL;
}
static inline void *pskb_pull(struct sk_buff *skb, unsigned int len)
{
if (!pskb_may_pull(skb, len))
return NULL;
skb->len -= len;
return skb->data += len;
}
void skb_condense(struct sk_buff *skb);
/**

2
net/ipv6/ip6_offload.c
View File

@ -232,7 +232,7 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
proto = iph->nexthdr;
ops = rcu_dereference(inet6_offloads[proto]);
if (!ops || !ops->callbacks.gro_receive) {
__pskb_pull(skb, skb_gro_offset(skb));
pskb_pull(skb, skb_gro_offset(skb));
skb_gro_frag0_invalidate(skb);
proto = ipv6_gso_pull_exthdrs(skb, proto);
skb_gro_pull(skb, -skb_transport_offset(skb));

4
net/mac80211/rx.c
View File

@ -49,7 +49,7 @@ static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
if (present_fcs_len)
__pskb_trim(skb, skb->len - present_fcs_len);
__pskb_pull(skb, rtap_space);
pskb_pull(skb, rtap_space);
hdr = (void *)skb->data;
fc = hdr->frame_control;
@ -74,7 +74,7 @@ static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb,
memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data,
hdrlen - IEEE80211_HT_CTL_LEN);
__pskb_pull(skb, IEEE80211_HT_CTL_LEN);
pskb_pull(skb, IEEE80211_HT_CTL_LEN);
return skb;
}

2
net/xfrm/espintcp.c
View File

@ -91,7 +91,7 @@ static void espintcp_rcv(struct strparser *strp, struct sk_buff *skb)
}
/* remove header, leave non-ESP marker/SPI */
if (!__pskb_pull(skb, rxm->offset + 2)) {
if (!pskb_pull(skb, rxm->offset + 2)) {
XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINERROR);
kfree_skb(skb);
return;