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[XFRM] netlink: Use nlmsg_parse() to parse attributes

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Uses nlmsg_parse() to parse the attributes. This actually changes
behaviour as unknown attributes (type > MAXTYPE) no longer cause
an error. Instead unknown attributes will be ignored henceforth
to keep older kernels compatible with more recent userspace tools.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2007-08-22 13:58:18 -07:00 committed by David S. Miller
parent 7deb226490
commit a7bd9a45c8
1 changed files with 12 additions and 26 deletions
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38
net/xfrm/xfrm_user.c
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@ -1890,7 +1890,7 @@ static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
}
#endif
#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
#define XMSGSIZE(type) sizeof(struct type)
static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
@ -1906,13 +1906,13 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
[XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
[XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
[XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
[XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
[XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
[XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
[XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
[XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
[XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
[XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
};
#undef XMSGSIZE
@ -1946,9 +1946,9 @@ static struct xfrm_link {
static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct rtattr *xfrma[XFRMA_MAX];
struct nlattr *xfrma[XFRMA_MAX+1];
struct xfrm_link *link;
int type, min_len;
int type, err;
type = nlh->nlmsg_type;
if (type > XFRM_MSG_MAX)
@ -1970,30 +1970,16 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
}
memset(xfrma, 0, sizeof(xfrma));
if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
return -EINVAL;
if (nlh->nlmsg_len > min_len) {
int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
while (RTA_OK(attr, attrlen)) {
unsigned short flavor = attr->rta_type;
if (flavor) {
if (flavor > XFRMA_MAX)
return -EINVAL;
xfrma[flavor - 1] = attr;
}
attr = RTA_NEXT(attr, attrlen);
}
}
/* FIXME: Temporary hack, nlmsg_parse() starts at xfrma[1], old code
* expects first attribute at xfrma[0] */
err = nlmsg_parse(nlh, xfrm_msg_min[type], xfrma-1, XFRMA_MAX, NULL);
if (err < 0)
return err;
if (link->doit == NULL)
return -EINVAL;
return link->doit(skb, nlh, xfrma);
return link->doit(skb, nlh, (struct rtattr **) xfrma);
}
static void xfrm_netlink_rcv(struct sock *sk, int len)