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uml: network driver MTU cleanups 

A bunch of MTU-related cleanups in the network code.

First, there is the addition of the notion of a maximally-sized packet, which
is the MTU plus headers.  This is used to size the skb that will receive a
packet.  This allows ether_adjust_skb to go away, as it was used to resize the
skb after it was allocated.

Since the skb passed into the low-level read routine is no longer resized, and
possibly reallocated, there, they (and the write routines) don't need to get
an sk_buff **.  They just need the sk_buff * now.  The callers of
ether_adjust_skb still need to do the skb_put, so that's now inlined.

The MAX_PACKET definitions in most of the drivers are gone.

The set_mtu methods were all the same and did nothing, so they can be
removed.

The ethertap driver had a typo which doubled the size of the packet rather
than adding two bytes to it.  It also wasn't defining its setup_size, causing
a zero-byte kmalloc and crash when the invalid pointer returned from kmalloc
was dereferenced.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-10-16 01:27:31 -07:00 committed by Linus Torvalds
parent cd1ae0e49b
commit b53f35a809
19 changed files with 80 additions and 188 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/um/drivers/daemon_kern.c
View File

@ -39,20 +39,15 @@ static void daemon_init(struct net_device *dev, void *data)
printk("\n");
}
static int daemon_read(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
if (*skb == NULL)
return -ENOMEM;
return net_recvfrom(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + ETH_HEADER_OTHER);
return net_recvfrom(fd, skb_mac_header(skb),
skb->dev->mtu + ETH_HEADER_OTHER);
}
static int daemon_write(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return daemon_user_write(fd, (*skb)->data, (*skb)->len,
return daemon_user_write(fd, skb->data, skb->len,
(struct daemon_data *) &lp->user);
}

11
arch/um/drivers/daemon_user.c
View File

@ -19,8 +19,6 @@
#include "um_malloc.h"
#include "user.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
enum request_type { REQ_NEW_CONTROL };
#define SWITCH_MAGIC 0xfeedface
@ -184,18 +182,13 @@ int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
}
static int daemon_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info daemon_user_info = {
.init = daemon_user_init,
.open = daemon_open,
.close = NULL,
.remove = daemon_remove,
.set_mtu = daemon_set_mtu,
.add_address = NULL,
.delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER
.mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
};

13
arch/um/drivers/mcast_kern.c
View File

@ -39,18 +39,15 @@ static void mcast_init(struct net_device *dev, void *data)
dpri->addr, dpri->port, dpri->ttl);
}
static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
static int mcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
if (*skb == NULL)
return -ENOMEM;
return net_recvfrom(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + ETH_HEADER_OTHER);
return net_recvfrom(fd, skb_mac_header(skb),
skb->dev->mtu + ETH_HEADER_OTHER);
}
static int mcast_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
static int mcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return mcast_user_write(fd, (*skb)->data, (*skb)->len,
return mcast_user_write(fd, skb->data, skb->len,
(struct mcast_data *) &lp->user);
}

11
arch/um/drivers/mcast_user.c
View File

@ -20,8 +20,6 @@
#include "um_malloc.h"
#include "user.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
static struct sockaddr_in *new_addr(char *addr, unsigned short port)
{
struct sockaddr_in *sin;
@ -154,18 +152,13 @@ int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri)
return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
}
static int mcast_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info mcast_user_info = {
.init = mcast_user_init,
.open = mcast_open,
.close = mcast_close,
.remove = mcast_remove,
.set_mtu = mcast_set_mtu,
.add_address = NULL,
.delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER
.mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
};

42
arch/um/drivers/net_kern.c
View File

@ -41,16 +41,16 @@ static int uml_net_rx(struct net_device *dev)
struct sk_buff *skb;
/* If we can't allocate memory, try again next round. */
skb = dev_alloc_skb(dev->mtu);
skb = dev_alloc_skb(lp->max_packet);
if (skb == NULL) {
lp->stats.rx_dropped++;
return 0;
}
skb->dev = dev;
skb_put(skb, dev->mtu);
skb_put(skb, lp->max_packet);
skb_reset_mac_header(skb);
pkt_len = (*lp->read)(lp->fd, &skb, lp);
pkt_len = (*lp->read)(lp->fd, skb, lp);
if (pkt_len > 0) {
skb_trim(skb, pkt_len);
@ -178,7 +178,7 @@ static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
spin_lock_irqsave(&lp->lock, flags);
len = (*lp->write)(lp->fd, &skb, lp);
len = (*lp->write)(lp->fd, skb, lp);
if (len == skb->len) {
lp->stats.tx_packets++;
@ -240,22 +240,9 @@ static int uml_net_set_mac(struct net_device *dev, void *addr)
static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
{
struct uml_net_private *lp = dev->priv;
int err = 0;
spin_lock_irq(&lp->lock);
new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
if (new_mtu < 0) {
err = new_mtu;
goto out;
}
dev->mtu = new_mtu;
out:
spin_unlock_irq(&lp->lock);
return err;
return 0;
}
static void uml_net_get_drvinfo(struct net_device *dev,
@ -427,6 +414,7 @@ static void eth_configure(int n, void *init, char *mac,
.dev = dev,
.fd = -1,
.mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
.max_packet = transport->user->max_packet,
.protocol = transport->kern->protocol,
.open = transport->user->open,
.close = transport->user->close,
@ -434,8 +422,7 @@ static void eth_configure(int n, void *init, char *mac,
.read = transport->kern->read,
.write = transport->kern->write,
.add_address = transport->user->add_address,
.delete_address = transport->user->delete_address,
.set_mtu = transport->user->set_mtu });
.delete_address = transport->user->delete_address });
init_timer(&lp->tl);
spin_lock_init(&lp->lock);
@ -447,7 +434,7 @@ static void eth_configure(int n, void *init, char *mac,
goto out_unregister;
set_ether_mac(dev, device->mac);
dev->mtu = transport->user->max_packet;
dev->mtu = transport->user->mtu;
dev->open = uml_net_open;
dev->hard_start_xmit = uml_net_start_xmit;
dev->stop = uml_net_close;
@ -807,19 +794,6 @@ static void close_devices(void)
__uml_exitcall(close_devices);
struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
{
if ((skb != NULL) && (skb_tailroom(skb) < extra)) {
struct sk_buff *skb2;
skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
dev_kfree_skb(skb);
skb = skb2;
}
if (skb != NULL) skb_put(skb, extra);
return skb;
}
void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
void *),
void *arg)

13
arch/um/drivers/pcap_kern.c
View File

@ -31,19 +31,14 @@ void pcap_init(struct net_device *dev, void *data)
printk("pcap backend, host interface %s\n", ppri->host_if);
}
static int pcap_read(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
if (*skb == NULL)
return -ENOMEM;
return pcap_user_read(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + ETH_HEADER_OTHER,
return pcap_user_read(fd, skb_mac_header(skb),
skb->dev->mtu + ETH_HEADER_OTHER,
(struct pcap_data *) &lp->user);
}
static int pcap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return -EPERM;
}

9
arch/um/drivers/pcap_user.c
View File

@ -13,8 +13,6 @@
#include "um_malloc.h"
#include "user.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
#define PCAP_FD(p) (*(int *)(p))
static int pcap_user_init(void *data, void *dev)
@ -23,7 +21,8 @@ static int pcap_user_init(void *data, void *dev)
pcap_t *p;
char errors[PCAP_ERRBUF_SIZE];
p = pcap_open_live(pri->host_if, MAX_PACKET, pri->promisc, 0, errors);
p = pcap_open_live(pri->host_if, ETH_MAX_PACKET + ETH_HEADER_OTHER,
pri->promisc, 0, errors);
if (p == NULL) {
printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - "
"'%s'\n", errors);
@ -133,8 +132,8 @@ const struct net_user_info pcap_user_info = {
.open = pcap_open,
.close = NULL,
.remove = pcap_remove,
.set_mtu = NULL,
.add_address = NULL,
.delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER
.mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
};

10
arch/um/drivers/slip_kern.c
View File

@ -47,17 +47,15 @@ static unsigned short slip_protocol(struct sk_buff *skbuff)
return htons(ETH_P_IP);
}
static int slip_read(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int slip_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return slip_user_read(fd, skb_mac_header(*skb), (*skb)->dev->mtu,
return slip_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
(struct slip_data *) &lp->user);
}
static int slip_write(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int slip_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return slip_user_write(fd, (*skb)->data, (*skb)->len,
return slip_user_write(fd, skb->data, skb->len,
(struct slip_data *) &lp->user);
}

9
arch/um/drivers/slip_user.c
View File

@ -230,11 +230,6 @@ int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
return slip_proto_write(fd, buf, len, &pri->slip);
}
static int slip_set_mtu(int mtu, void *data)
{
return mtu;
}
static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
void *data)
{
@ -260,8 +255,8 @@ const struct net_user_info slip_user_info = {
.open = slip_open,
.close = slip_close,
.remove = NULL,
.set_mtu = slip_set_mtu,
.add_address = slip_add_addr,
.delete_address = slip_del_addr,
.max_packet = BUF_SIZE
.mtu = BUF_SIZE,
.max_packet = BUF_SIZE,
};

14
arch/um/drivers/slirp_kern.c
View File

@ -52,18 +52,16 @@ static unsigned short slirp_protocol(struct sk_buff *skbuff)
return htons(ETH_P_IP);
}
static int slirp_read(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return slirp_user_read(fd, skb_mac_header(*skb), (*skb)->dev->mtu,
(struct slirp_data *) &lp->user);
return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
(struct slirp_data *) &lp->user);
}
static int slirp_write(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return slirp_user_write(fd, (*skb)->data, (*skb)->len,
(struct slirp_data *) &lp->user);
return slirp_user_write(fd, skb->data, skb->len,
(struct slirp_data *) &lp->user);
}
const struct net_kern_info slirp_kern_info = {

9
arch/um/drivers/slirp_user.c
View File

@ -124,18 +124,13 @@ int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
return slip_proto_write(fd, buf, len, &pri->slip);
}
static int slirp_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info slirp_user_info = {
.init = slirp_user_init,
.open = slirp_open,
.close = slirp_close,
.remove = NULL,
.set_mtu = slirp_set_mtu,
.add_address = NULL,
.delete_address = NULL,
.max_packet = BUF_SIZE
.mtu = BUF_SIZE,
.max_packet = BUF_SIZE,
};

19
arch/um/drivers/vde_kern.c
View File

@ -36,30 +36,25 @@ static void vde_init(struct net_device *dev, void *data)
printk("\n");
}
static int vde_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
struct vde_data *pri = (struct vde_data *) &lp->user;
if (pri->conn != NULL) {
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
if (*skb == NULL)
return -ENOMEM;
return vde_user_read(pri->conn, skb_mac_header(*skb),
(*skb)->dev->mtu + ETH_HEADER_OTHER);
}
if (pri->conn != NULL)
return vde_user_read(pri->conn, skb_mac_header(skb),
skb->dev->mtu + ETH_HEADER_OTHER);
printk(KERN_ERR "vde_read - we have no VDECONN to read from");
return -EBADF;
}
static int vde_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
struct vde_data *pri = (struct vde_data *) &lp->user;
if (pri->conn != NULL)
return vde_user_write((void *)pri->conn, (*skb)->data,
(*skb)->len);
return vde_user_write((void *)pri->conn, skb->data,
skb->len);
printk(KERN_ERR "vde_write - we have no VDECONN to write to");
return -EBADF;

11
arch/um/drivers/vde_user.c
View File

@ -12,8 +12,6 @@
#include "user.h"
#include "vde.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
static int vde_user_init(void *data, void *dev)
{
struct vde_data *pri = data;
@ -65,20 +63,15 @@ static void vde_remove(void *data)
printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
}
static int vde_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info vde_user_info = {
.init = vde_user_init,
.open = vde_user_open,
.close = NULL,
.remove = vde_remove,
.set_mtu = vde_set_mtu,
.add_address = NULL,
.delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER
.mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
};
void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)

13
arch/um/include/net_kern.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
@ -30,24 +30,24 @@ struct uml_net_private {
struct work_struct work;
int fd;
unsigned char mac[ETH_ALEN];
int max_packet;
unsigned short (*protocol)(struct sk_buff *);
int (*open)(void *);
void (*close)(int, void *);
void (*remove)(void *);
int (*read)(int, struct sk_buff **skb, struct uml_net_private *);
int (*write)(int, struct sk_buff **skb, struct uml_net_private *);
int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
void (*add_address)(unsigned char *, unsigned char *, void *);
void (*delete_address)(unsigned char *, unsigned char *, void *);
int (*set_mtu)(int mtu, void *);
char user[0];
};
struct net_kern_info {
void (*init)(struct net_device *, void *);
unsigned short (*protocol)(struct sk_buff *);
int (*read)(int, struct sk_buff **skb, struct uml_net_private *);
int (*write)(int, struct sk_buff **skb, struct uml_net_private *);
int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
};
struct transport {
@ -62,7 +62,6 @@ struct transport {
extern struct net_device *ether_init(int);
extern unsigned short ether_protocol(struct sk_buff *);
extern struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra);
extern int tap_setup_common(char *str, char *type, char **dev_name,
char **mac_out, char **gate_addr);
extern void register_transport(struct transport *new);

4
arch/um/include/net_user.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
@ -18,10 +18,10 @@ struct net_user_info {
int (*open)(void *);
void (*close)(int, void *);
void (*remove)(void *);
int (*set_mtu)(int mtu, void *);
void (*add_address)(unsigned char *, unsigned char *, void *);
void (*delete_address)(unsigned char *, unsigned char *, void *);
int max_packet;
int mtu;
};
extern void ether_user_init(void *data, void *dev);

30
arch/um/os-Linux/drivers/ethertap_kern.c
View File

@ -36,35 +36,24 @@ static void etap_init(struct net_device *dev, void *data)
printk("\n");
}
static int etap_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
int len;
*skb = ether_adjust_skb(*skb, ETH_HEADER_ETHERTAP);
if (*skb == NULL)
return -ENOMEM;
len = net_recvfrom(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + 2 * ETH_HEADER_ETHERTAP);
len = net_recvfrom(fd, skb_mac_header(skb),
skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
if (len <= 0)
return len;
skb_pull(*skb, 2);
return(len);
skb_pull(skb, 2);
len -= 2;
return len;
}
static int etap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
if (skb_headroom(*skb) < 2) {
struct sk_buff *skb2;
skb2 = skb_realloc_headroom(*skb, 2);
dev_kfree_skb(*skb);
if (skb2 == NULL)
return -ENOMEM;
*skb = skb2;
}
skb_push(*skb, 2);
return net_send(fd, (*skb)->data, (*skb)->len);
skb_push(skb, 2);
return net_send(fd, skb->data, skb->len);
}
const struct net_kern_info ethertap_kern_info = {
@ -99,6 +88,7 @@ static struct transport ethertap_transport = {
.user = &ethertap_user_info,
.kern = &ethertap_kern_info,
.private_size = sizeof(struct ethertap_data),
.setup_size = sizeof(struct ethertap_init),
};
static int register_ethertap(void)

9
arch/um/os-Linux/drivers/ethertap_user.c
View File

@ -222,11 +222,6 @@ static void etap_close(int fd, void *data)
pri->control_fd = -1;
}
static int etap_set_mtu(int mtu, void *data)
{
return mtu;
}
static void etap_add_addr(unsigned char *addr, unsigned char *netmask,
void *data)
{
@ -254,8 +249,8 @@ const struct net_user_info ethertap_user_info = {
.open = etap_open,
.close = etap_close,
.remove = NULL,
.set_mtu = etap_set_mtu,
.add_address = etap_add_addr,
.delete_address = etap_del_addr,
.max_packet = MAX_PACKET - ETH_HEADER_ETHERTAP
.mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_ETHERTAP,
};

15
arch/um/os-Linux/drivers/tuntap_kern.c
View File

@ -35,20 +35,15 @@ static void tuntap_init(struct net_device *dev, void *data)
printk("\n");
}
static int tuntap_read(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int tuntap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
if (*skb == NULL)
return -ENOMEM;
return net_read(fd, skb_mac_header(*skb),
(*skb)->dev->mtu + ETH_HEADER_OTHER);
return net_read(fd, skb_mac_header(skb),
skb->dev->mtu + ETH_HEADER_OTHER);
}
static int tuntap_write(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
static int tuntap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return net_write(fd, (*skb)->data, (*skb)->len);
return net_write(fd, skb->data, skb->len);
}
const struct net_kern_info tuntap_kern_info = {

11
arch/um/os-Linux/drivers/tuntap_user.c
View File

@ -18,8 +18,6 @@
#include "tuntap.h"
#include "user.h"
#define MAX_PACKET ETH_MAX_PACKET
static int tuntap_user_init(void *data, void *dev)
{
struct tuntap_data *pri = data;
@ -206,18 +204,13 @@ static void tuntap_close(int fd, void *data)
pri->fd = -1;
}
static int tuntap_set_mtu(int mtu, void *data)
{
return mtu;
}
const struct net_user_info tuntap_user_info = {
.init = tuntap_user_init,
.open = tuntap_open,
.close = tuntap_close,
.remove = NULL,
.set_mtu = tuntap_set_mtu,
.add_address = tuntap_add_addr,
.delete_address = tuntap_del_addr,
.max_packet = MAX_PACKET
.mtu = ETH_MAX_PACKET,
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
};