xfrm: Using the right namespace to migrate key info

because the home agent could surely be run on a different
net namespace other than init_net. The original behavior
could lead into inconsistent of key info.

Signed-off-by: Fan Du <fan.du@windriver.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

4 files changed, 10 insertions, 8 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 6b82fdf4ba71..5b522c5f0188 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1581,7 +1581,7 @@ struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
                                       struct xfrm_migrate *m);
 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
                  struct xfrm_migrate *m, int num_bundles,
-                 struct xfrm_kmaddress *k);
+                 struct xfrm_kmaddress *k, struct net *net);
 #endif
 
 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 545f047868ad..3fa811c46913 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -2485,6 +2485,7 @@ static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
         struct xfrm_selector sel;
         struct xfrm_migrate m[XFRM_MAX_DEPTH];
         struct xfrm_kmaddress k;
+        struct net *net = sock_net(sk);
 
         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
@@ -2558,7 +2559,7 @@ static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
         }
 
         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
-                            kma ? &k : NULL);
+                            kma ? &k : NULL, net);
 
  out:
         return err;
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index a5bbdfb2874b..907fd2fa70bc 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -3076,14 +3076,14 @@ static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
 }
 
 static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel,
-                                                     u8 dir, u8 type)
+                                                     u8 dir, u8 type, struct net *net)
 {
         struct xfrm_policy *pol, *ret = NULL;
         struct hlist_head *chain;
         u32 priority = ~0U;
 
         read_lock_bh(&xfrm_policy_lock);
-        chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
+        chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
         hlist_for_each_entry(pol, chain, bydst) {
                 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
                     pol->type == type) {
@@ -3092,7 +3092,7 @@ static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector
                         break;
                 }
         }
-        chain = &init_net.xfrm.policy_inexact[dir];
+        chain = &net->xfrm.policy_inexact[dir];
         hlist_for_each_entry(pol, chain, bydst) {
                 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
                     pol->type == type &&
@@ -3216,7 +3216,7 @@ static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
 
 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
                  struct xfrm_migrate *m, int num_migrate,
-                 struct xfrm_kmaddress *k)
+                 struct xfrm_kmaddress *k, struct net *net)
 {
         int i, err, nx_cur = 0, nx_new = 0;
         struct xfrm_policy *pol = NULL;
@@ -3229,7 +3229,7 @@ int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
                 goto out;
 
         /* Stage 1 - find policy */
-        if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
+        if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
                 err = -ENOENT;
                 goto out;
         }
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 4e0546e9bb0a..840cc8d9fbe4 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2137,6 +2137,7 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
         u8 type;
         int err;
         int n = 0;
+        struct net *net = sock_net(skb->sk);
 
         if (attrs[XFRMA_MIGRATE] == NULL)
                 return -EINVAL;
@@ -2154,7 +2155,7 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
         if (!n)
                 return 0;
 
-        xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
+        xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
 
         return 0;
 }