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authorDmitry Safonov <dima@arista.com>2020-09-21 15:36:52 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2020-09-24 08:53:03 +0200
commit5461fc0c8d9f23956b99f5907f69726a293ccb67 (patch)
treec7cd6ef843f83276a0743f6f6e11ae1357ff5a84 /net/xfrm/xfrm_user.c
parentc9e7c76d70fa50582ca96759829c93d0dd024662 (diff)
downloadlinux-5461fc0c8d9f23956b99f5907f69726a293ccb67.tar.bz2
xfrm/compat: Add 64=>32-bit messages translator
Provide the kernel-to-user translator under XFRM_USER_COMPAT, that creates for 64-bit xfrm-user message a 32-bit translation and puts it in skb's frag_list. net/compat.c layer provides MSG_CMSG_COMPAT to decide if the message should be taken from skb or frag_list. (used by wext-core which has also an ABI difference) Kernel sends 64-bit xfrm messages to the userspace for: - multicast (monitor events) - netlink dumps Wire up the translator to xfrm_nlmsg_multicast(). Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_user.c')
-rw-r--r--net/xfrm/xfrm_user.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index fbb7d9d06478..3769227ed4e1 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1083,12 +1083,24 @@ static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
u32 pid, unsigned int group)
{
struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
+ struct xfrm_translator *xtr;
if (!nlsk) {
kfree_skb(skb);
return -EPIPE;
}
+ xtr = xfrm_get_translator();
+ if (xtr) {
+ int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
+
+ xfrm_put_translator(xtr);
+ if (err) {
+ kfree_skb(skb);
+ return err;
+ }
+ }
+
return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
}
@@ -2533,7 +2545,7 @@ static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
#define XMSGSIZE(type) sizeof(struct type)
-static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
+const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
[XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
[XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
@@ -2556,6 +2568,7 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
[XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
};
+EXPORT_SYMBOL_GPL(xfrm_msg_min);
#undef XMSGSIZE