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[IP]: Introduce ip_options_get_from_user

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This variant is needed to satisfy sparse __user annotations.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo 2005-08-16 19:46:48 -03:00 committed by David S. Miller
parent 6ed8a48582
commit 4c6ea29d82
3 changed files with 40 additions and 18 deletions
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5
include/net/ip.h
View file

@ -335,7 +335,10 @@ extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 da
extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
extern void ip_options_fragment(struct sk_buff *skb);
extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb);
extern int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user);
extern int ip_options_get(struct ip_options **optp,
unsigned char *data, int optlen);
extern int ip_options_get_from_user(struct ip_options **optp,
unsigned char __user *data, int optlen);
extern void ip_options_undo(struct ip_options * opt);
extern void ip_forward_options(struct sk_buff *skb);
extern int ip_options_rcv_srr(struct sk_buff *skb);

49
net/ipv4/ip_options.c
View file

@ -489,23 +489,18 @@ void ip_options_undo(struct ip_options * opt)
}
}
int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user)
static struct ip_options *ip_options_get_alloc(const int optlen)
{
struct ip_options *opt;
struct ip_options *opt = kmalloc(sizeof(*opt) + ((optlen + 3) & ~3),
GFP_KERNEL);
if (opt)
memset(opt, 0, sizeof(*opt));
return opt;
}
opt = kmalloc(sizeof(struct ip_options)+((optlen+3)&~3), GFP_KERNEL);
if (!opt)
return -ENOMEM;
memset(opt, 0, sizeof(struct ip_options));
if (optlen) {
if (user) {
if (copy_from_user(opt->__data, data, optlen)) {
kfree(opt);
return -EFAULT;
}
} else
memcpy(opt->__data, data, optlen);
}
static int ip_options_get_finish(struct ip_options **optp,
struct ip_options *opt, int optlen)
{
while (optlen & 3)
opt->__data[optlen++] = IPOPT_END;
opt->optlen = optlen;
@ -521,6 +516,30 @@ int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, in
return 0;
}
int ip_options_get_from_user(struct ip_options **optp, unsigned char __user *data, int optlen)
{
struct ip_options *opt = ip_options_get_alloc(optlen);
if (!opt)
return -ENOMEM;
if (optlen && copy_from_user(opt->__data, data, optlen)) {
kfree(opt);
return -EFAULT;
}
return ip_options_get_finish(optp, opt, optlen);
}
int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen)
{
struct ip_options *opt = ip_options_get_alloc(optlen);
if (!opt)
return -ENOMEM;
if (optlen)
memcpy(opt->__data, data, optlen);
return ip_options_get_finish(optp, opt, optlen);
}
void ip_forward_options(struct sk_buff *skb)
{
struct ip_options * opt = &(IPCB(skb)->opt);

4
net/ipv4/ip_sockglue.c
View file

@ -153,7 +153,7 @@ int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
switch (cmsg->cmsg_type) {
case IP_RETOPTS:
err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40, 0);
err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
if (err)
return err;
break;
@ -425,7 +425,7 @@ int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
struct ip_options * opt = NULL;
if (optlen > 40 || optlen < 0)
goto e_inval;
err = ip_options_get(&opt, optval, optlen, 1);
err = ip_options_get_from_user(&opt, optval, optlen);
if (err)
break;
if (sk->sk_type == SOCK_STREAM) {