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networking: make skb_pull & friends return void pointers

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It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.

Make these functions return void * and remove all the casts across
the tree, adding a (u8 *) cast only where the unsigned char pointer
was used directly, all done with the following spatch:

    @@
    expression SKB, LEN;
    typedef u8;
    identifier fn = {
            skb_pull,
            __skb_pull,
            skb_pull_inline,
            __pskb_pull_tail,
            __pskb_pull,
            pskb_pull
    };
    @@
    - *(fn(SKB, LEN))
    + *(u8 *)fn(SKB, LEN)

    @@
    expression E, SKB, LEN;
    identifier fn = {
            skb_pull,
            __skb_pull,
            skb_pull_inline,
            __pskb_pull_tail,
            __pskb_pull,
            pskb_pull
    };
    type T;
    @@
    - E = ((T *)(fn(SKB, LEN)))
    + E = fn(SKB, LEN)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2017-06-16 14:29:22 +02:00 committed by David S. Miller
parent 4df864c1d9
commit af72868b90
13 changed files with 29 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/bluetooth/hci_nokia.c
View File

@ -557,7 +557,7 @@ static int nokia_recv_negotiation_packet(struct hci_dev *hdev,
goto finish_neg;
}
evt = (struct hci_nokia_neg_evt *)skb_pull(skb, sizeof(*hdr));
evt = skb_pull(skb, sizeof(*hdr));
if (evt->ack != NOKIA_NEG_ACK) {
dev_err(dev, "Negotiation received: wrong reply");
@ -595,7 +595,7 @@ static int nokia_recv_alive_packet(struct hci_dev *hdev, struct sk_buff *skb)
goto finish_alive;
}
pkt = (struct hci_nokia_alive_pkt *)skb_pull(skb, sizeof(*hdr));
pkt = skb_pull(skb, sizeof(*hdr));
if (pkt->mid != NOKIA_ALIVE_RESP) {
dev_err(dev, "Alive received: invalid response: 0x%02x!",

2
drivers/isdn/i4l/isdn_ppp.c
View File

@ -1509,7 +1509,7 @@ int isdn_ppp_autodial_filter(struct sk_buff *skb, isdn_net_local *lp)
* temporarily remove part of the fake header stuck on
* earlier.
*/
*skb_pull(skb, IPPP_MAX_HEADER - 4) = 1; /* indicate outbound */
*(u8 *)skb_pull(skb, IPPP_MAX_HEADER - 4) = 1; /* indicate outbound */
{
__be16 *p = (__be16 *)skb->data;

2
drivers/net/wan/hdlc_ppp.c
View File

@ -448,7 +448,7 @@ static int ppp_rx(struct sk_buff *skb)
/* Check HDLC header */
if (skb->len < sizeof(struct hdlc_header))
goto rx_error;
cp = (struct cp_header*)skb_pull(skb, sizeof(struct hdlc_header));
cp = skb_pull(skb, sizeof(struct hdlc_header));
if (hdr->address != HDLC_ADDR_ALLSTATIONS ||
hdr->control != HDLC_CTRL_UI)
goto rx_error;

3
drivers/nfc/nxp-nci/firmware.c
View File

@ -311,8 +311,7 @@ void nxp_nci_fw_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
if (nxp_nci_fw_check_crc(skb) != 0x00)
fw_info->cmd_result = -EBADMSG;
else
fw_info->cmd_result = nxp_nci_fw_read_status(
*skb_pull(skb, NXP_NCI_FW_HDR_LEN));
fw_info->cmd_result = nxp_nci_fw_read_status(*(u8 *)skb_pull(skb, NXP_NCI_FW_HDR_LEN));
kfree_skb(skb);
} else {
fw_info->cmd_result = -EIO;

2
drivers/scsi/fnic/fnic_fcs.c
View File

@ -640,7 +640,7 @@ static inline int fnic_import_rq_eth_pkt(struct fnic *fnic, struct sk_buff *skb)
eh = (struct ethhdr *)skb->data;
if (eh->h_proto == htons(ETH_P_8021Q)) {
memmove((u8 *)eh + VLAN_HLEN, eh, ETH_ALEN * 2);
eh = (struct ethhdr *)skb_pull(skb, VLAN_HLEN);
eh = skb_pull(skb, VLAN_HLEN);
skb_reset_mac_header(skb);
}
if (eh->h_proto == htons(ETH_P_FIP)) {

2
drivers/scsi/qedf/qedf_main.c
View File

@ -2117,7 +2117,7 @@ static void qedf_ll2_process_skb(struct work_struct *work)
/* Undo VLAN encapsulation */
if (eh->h_proto == htons(ETH_P_8021Q)) {
memmove((u8 *)eh + VLAN_HLEN, eh, ETH_ALEN * 2);
eh = (struct ethhdr *)skb_pull(skb, VLAN_HLEN);
eh = skb_pull(skb, VLAN_HLEN);
skb_reset_mac_header(skb);
}

14
include/linux/skbuff.h
View File

@ -1931,22 +1931,22 @@ static inline unsigned char *__skb_push(struct sk_buff *skb, unsigned int len)
return skb->data;
}
unsigned char *skb_pull(struct sk_buff *skb, unsigned int len);
static inline unsigned char *__skb_pull(struct sk_buff *skb, unsigned int len)
void *skb_pull(struct sk_buff *skb, unsigned int len);
static inline void *__skb_pull(struct sk_buff *skb, unsigned int len)
{
skb->len -= len;
BUG_ON(skb->len < skb->data_len);
return skb->data += len;
}
static inline unsigned char *skb_pull_inline(struct sk_buff *skb, unsigned int len)
static inline void *skb_pull_inline(struct sk_buff *skb, unsigned int len)
{
return unlikely(len > skb->len) ? NULL : __skb_pull(skb, len);
}
unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta);
void *__pskb_pull_tail(struct sk_buff *skb, int delta);
static inline unsigned char *__pskb_pull(struct sk_buff *skb, unsigned int len)
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)))
@ -1955,7 +1955,7 @@ static inline unsigned char *__pskb_pull(struct sk_buff *skb, unsigned int len)
return skb->data += len;
}
static inline unsigned char *pskb_pull(struct sk_buff *skb, unsigned int len)
static inline void *pskb_pull(struct sk_buff *skb, unsigned int len)
{
return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len);
}
@ -2938,7 +2938,7 @@ static inline void skb_postpush_rcsum(struct sk_buff *skb,
__skb_postpush_rcsum(skb, start, len, 0);
}
unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len);
void *skb_pull_rcsum(struct sk_buff *skb, unsigned int len);
/**
* skb_push_rcsum - push skb and update receive checksum

4
net/bluetooth/a2mp.c
View File

@ -239,7 +239,7 @@ static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
}
len -= sizeof(*cl);
cl = (void *) skb_pull(skb, sizeof(*cl));
cl = skb_pull(skb, sizeof(*cl));
}
/* Fall back to L2CAP init sequence */
@ -279,7 +279,7 @@ static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
while (skb->len >= sizeof(*cl)) {
BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
cl->status);
cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
cl = skb_pull(skb, sizeof(*cl));
}
/* TODO send A2MP_CHANGE_RSP */

6
net/core/skbuff.c
View File

@ -1481,7 +1481,7 @@ EXPORT_SYMBOL(skb_push);
* 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)
void *skb_pull(struct sk_buff *skb, unsigned int len)
{
return skb_pull_inline(skb, len);
}
@ -1616,7 +1616,7 @@ EXPORT_SYMBOL(___pskb_trim);
*
* It is pretty complicated. Luckily, it is called only in exceptional cases.
*/
unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta)
void *__pskb_pull_tail(struct sk_buff *skb, int delta)
{
/* If skb has not enough free space at tail, get new one
* plus 128 bytes for future expansions. If we have enough
@ -3065,7 +3065,7 @@ EXPORT_SYMBOL_GPL(skb_append_pagefrags);
* that the checksum difference is zero (e.g., a valid IP header)
* or you are setting ip_summed to CHECKSUM_NONE.
*/
unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len)
void *skb_pull_rcsum(struct sk_buff *skb, unsigned int len)
{
unsigned char *data = skb->data;

6
net/ipv4/ipmr.c
View File

@ -669,7 +669,8 @@ static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
if (ip_hdr(skb)->version == 0) {
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
struct nlmsghdr *nlh = skb_pull(skb,
sizeof(struct iphdr));
nlh->nlmsg_type = NLMSG_ERROR;
nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
skb_trim(skb, nlh->nlmsg_len);
@ -972,7 +973,8 @@ static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
/* Play the pending entries through our router */
while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
if (ip_hdr(skb)->version == 0) {
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
struct nlmsghdr *nlh = skb_pull(skb,
sizeof(struct iphdr));
if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
nlh->nlmsg_len = skb_tail_pointer(skb) -

3
net/ipv4/xfrm4_mode_beet.c
View File

@ -57,8 +57,7 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
xfrm4_beet_make_header(skb);
ph = (struct ip_beet_phdr *)
__skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
top_iph = ip_hdr(skb);

6
net/ipv6/ip6mr.c
View File

@ -846,7 +846,8 @@ static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
if (ipv6_hdr(skb)->version == 0) {
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
struct nlmsghdr *nlh = skb_pull(skb,
sizeof(struct ipv6hdr));
nlh->nlmsg_type = NLMSG_ERROR;
nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
skb_trim(skb, nlh->nlmsg_len);
@ -1106,7 +1107,8 @@ static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
if (ipv6_hdr(skb)->version == 0) {
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
struct nlmsghdr *nlh = skb_pull(skb,
sizeof(struct ipv6hdr));
if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;

2
net/ipv6/xfrm6_mode_beet.c
View File

@ -54,7 +54,7 @@ static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
skb->mac_header = skb->network_header +
offsetof(struct ipv6hdr, nexthdr);
skb->transport_header = skb->network_header + sizeof(*top_iph);
ph = (struct ip_beet_phdr *)__skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl-hdr_len);
ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdr_len);
xfrm6_beet_make_header(skb);