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Date: Wed, 19 Feb 2014 17:12:56 +0800
From: Fan Du <fan.du@...driver.com>
To: <steffen.klassert@...unet.com>
CC: <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: [PATCH net-next] xfrm: Correctly parse netlink msg from 32bits ip command on 64bits host
When trying to setup IPsec configuration on a 64bits host with
iproute2(32bits compiled), the intended xfrm policy and sa is
either deficit or wrong when kernel trying to parse user land
information.
Add compat support for 32bits compiled ip command for 64bits host.
Signed-off-by: Fan Du <fan.du@...driver.com>
---
include/uapi/linux/xfrm.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
net/xfrm/xfrm_user.c | 16 +++++++++++++++-
2 files changed, 59 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h
index a8cd6a4..8d2fa8d 100644
--- a/include/uapi/linux/xfrm.h
+++ b/include/uapi/linux/xfrm.h
@@ -506,4 +506,48 @@ enum xfrm_nlgroups {
};
#define XFRMNLGRP_MAX (__XFRMNLGRP_MAX - 1)
+#ifdef CONFIG_COMPAT
+
+struct compat_xfrm_userpolicy_info {
+ struct xfrm_selector sel;
+ struct xfrm_lifetime_cfg lft;
+ struct xfrm_lifetime_cur curlft;
+ __u32 priority;
+ __u32 index;
+ __u8 dir;
+ __u8 action;
+#define XFRM_POLICY_ALLOW 0
+#define XFRM_POLICY_BLOCK 1
+ __u8 flags;
+#define XFRM_POLICY_LOCALOK 1 /* Allow user to override global policy */
+ /* Automatically expand selector to include matching ICMP payloads. */
+#define XFRM_POLICY_ICMP 2
+ __u8 share;
+} __attribute__((packed));
+
+struct compat_xfrm_usersa_info {
+ struct xfrm_selector sel;
+ struct xfrm_id id;
+ xfrm_address_t saddr;
+ struct xfrm_lifetime_cfg lft;
+ struct xfrm_lifetime_cur curlft;
+ struct xfrm_stats stats;
+ __u32 seq;
+ __u32 reqid;
+ __u16 family;
+ __u8 mode; /* XFRM_MODE_xxx */
+ __u8 replay_window;
+ __u8 flags;
+#define XFRM_STATE_NOECN 1
+#define XFRM_STATE_DECAP_DSCP 2
+#define XFRM_STATE_NOPMTUDISC 4
+#define XFRM_STATE_WILDRECV 8
+#define XFRM_STATE_ICMP 16
+#define XFRM_STATE_AF_UNSPEC 32
+#define XFRM_STATE_ALIGN4 64
+#define XFRM_STATE_ESN 128
+} __attribute__((packed));
+
+#endif
+
#endif /* _LINUX_XFRM_H */
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 1ae3ec7..8bfbd95 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2281,6 +2281,12 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
};
+static const int compat_xfrm_msg_min[XFRM_NR_MSGTYPES] = {
+ [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info),
+ [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),
+ [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info),
+};
+
#undef XMSGSIZE
static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
@@ -2346,6 +2352,7 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct nlattr *attrs[XFRMA_MAX+1];
const struct xfrm_link *link;
int type, err;
+ int len;
type = nlh->nlmsg_type;
if (type > XFRM_MSG_MAX)
@@ -2373,7 +2380,14 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
}
- err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
+#ifdef CONFIG_COMPAT
+ if (is_compat_task())
+ len = compat_xfrm_msg_min[type];
+ else
+#endif
+ len = xfrm_msg_min[type];
+
+ err = nlmsg_parse(nlh, len, attrs, XFRMA_MAX,
xfrma_policy);
if (err < 0)
return err;
--
1.7.9.5
--
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