[XFRM] POLICY: Support netlink socket interface for sub policy.

Sub policy can be used through netlink socket.
PF_KEY uses main only and it is TODO to support sub.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 121 insertions, 13 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 7303b820bea4..c59a78d2923a 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -786,6 +786,22 @@ static int verify_policy_dir(__u8 dir)
         return 0;
 }
 
+static int verify_policy_type(__u8 type)
+{
+        switch (type) {
+        case XFRM_POLICY_TYPE_MAIN:
+#ifdef CONFIG_XFRM_SUB_POLICY
+        case XFRM_POLICY_TYPE_SUB:
+#endif
+                break;
+
+        default:
+                return -EINVAL;
+        };
+
+        return 0;
+}
+
 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
 {
         switch (p->share) {
@@ -879,6 +895,29 @@ static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
         return 0;
 }
 
+static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
+{
+        struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
+        struct xfrm_userpolicy_type *upt;
+        __u8 type = XFRM_POLICY_TYPE_MAIN;
+        int err;
+
+        if (rt) {
+                if (rt->rta_len < sizeof(*upt))
+                        return -EINVAL;
+
+                upt = RTA_DATA(rt);
+                type = upt->type;
+        }
+
+        err = verify_policy_type(type);
+        if (err)
+                return err;
+
+        *tp = type;
+        return 0;
+}
+
 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
 {
         xp->priority = p->priority;
@@ -917,16 +956,20 @@ static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p,
 
         copy_from_user_policy(xp, p);
 
+        err = copy_from_user_policy_type(&xp->type, xfrma);
+        if (err)
+                goto error;
+
         if (!(err = copy_from_user_tmpl(xp, xfrma)))
                 err = copy_from_user_sec_ctx(xp, xfrma);
-
-        if (err) {
-                *errp = err;
-                kfree(xp);
-                xp = NULL;
-        }
+        if (err)
+                goto error;
 
         return xp;
+ error:
+        *errp = err;
+        kfree(xp);
+        return NULL;
 }
 
 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
@@ -1037,6 +1080,29 @@ static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *s
         return 0;
 }
 
+#ifdef CONFIG_XFRM_SUB_POLICY
+static int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+        struct xfrm_userpolicy_type upt;
+
+        memset(&upt, 0, sizeof(upt));
+        upt.type = xp->type;
+
+        RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
+
+        return 0;
+
+rtattr_failure:
+        return -1;
+}
+
+#else
+static inline int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+        return 0;
+}
+#endif
+
 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
 {
         struct xfrm_dump_info *sp = ptr;
@@ -1060,6 +1126,8 @@ static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr
                 goto nlmsg_failure;
         if (copy_to_user_sec_ctx(xp, skb))
                 goto nlmsg_failure;
+        if (copy_to_user_policy_type(xp, skb) < 0)
+                goto nlmsg_failure;
 
         nlh->nlmsg_len = skb->tail - b;
 out:
@@ -1081,7 +1149,10 @@ static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
         info.nlmsg_flags = NLM_F_MULTI;
         info.this_idx = 0;
         info.start_idx = cb->args[0];
-        (void) xfrm_policy_walk(dump_one_policy, &info);
+        (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
+#ifdef CONFIG_XFRM_SUB_POLICY
+        (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
+#endif
         cb->args[0] = info.this_idx;
 
         return skb->len;
@@ -1117,6 +1188,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
 {
         struct xfrm_policy *xp;
         struct xfrm_userpolicy_id *p;
+        __u8 type = XFRM_POLICY_TYPE_MAIN;
         int err;
         struct km_event c;
         int delete;
@@ -1124,12 +1196,16 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
         p = NLMSG_DATA(nlh);
         delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
 
+        err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
+        if (err)
+                return err;
+
         err = verify_policy_dir(p->dir);
         if (err)
                 return err;
 
         if (p->index)
-                xp = xfrm_policy_byid(p->dir, p->index, delete);
+                xp = xfrm_policy_byid(type, p->dir, p->index, delete);
         else {
                 struct rtattr **rtattrs = (struct rtattr **)xfrma;
                 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
@@ -1146,7 +1222,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
                         if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
                                 return err;
                 }
-                xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete);
+                xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
                 security_xfrm_policy_free(&tmp);
         }
         if (xp == NULL)
@@ -1329,9 +1405,16 @@ out:
 
 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
 {
-struct km_event c;
+        struct km_event c;
+        __u8 type = XFRM_POLICY_TYPE_MAIN;
+        int err;
+
+        err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
+        if (err)
+                return err;
 
-        xfrm_policy_flush();
+        xfrm_policy_flush(type);
+        c.data.type = type;
         c.event = nlh->nlmsg_type;
         c.seq = nlh->nlmsg_seq;
         c.pid = nlh->nlmsg_pid;
@@ -1344,10 +1427,15 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void *
         struct xfrm_policy *xp;
         struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
         struct xfrm_userpolicy_info *p = &up->pol;
+        __u8 type = XFRM_POLICY_TYPE_MAIN;
         int err = -ENOENT;
 
+        err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
+        if (err)
+                return err;
+
         if (p->index)
-                xp = xfrm_policy_byid(p->dir, p->index, 0);
+                xp = xfrm_policy_byid(type, p->dir, p->index, 0);
         else {
                 struct rtattr **rtattrs = (struct rtattr **)xfrma;
                 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
@@ -1364,7 +1452,7 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void *
                         if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
                                 return err;
                 }
-                xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0);
+                xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0);
                 security_xfrm_policy_free(&tmp);
         }
 
@@ -1818,6 +1906,8 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
                 goto nlmsg_failure;
         if (copy_to_user_state_sec_ctx(x, skb))
                 goto nlmsg_failure;
+        if (copy_to_user_policy_type(xp, skb) < 0)
+                goto nlmsg_failure;
 
         nlh->nlmsg_len = skb->tail - b;
         return skb->len;
@@ -1898,6 +1988,7 @@ static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
         }
 
         copy_from_user_policy(xp, p);
+        xp->type = XFRM_POLICY_TYPE_MAIN;
         copy_templates(xp, ut, nr);
 
         if (!xp->security) {
@@ -1931,6 +2022,8 @@ static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
                 goto nlmsg_failure;
         if (copy_to_user_sec_ctx(xp, skb))
                 goto nlmsg_failure;
+        if (copy_to_user_policy_type(xp, skb) < 0)
+                goto nlmsg_failure;
         upe->hard = !!hard;
 
         nlh->nlmsg_len = skb->tail - b;
@@ -2002,6 +2095,8 @@ static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *
         copy_to_user_policy(xp, p, dir);
         if (copy_to_user_tmpl(xp, skb) < 0)
                 goto nlmsg_failure;
+        if (copy_to_user_policy_type(xp, skb) < 0)
+                goto nlmsg_failure;
 
         nlh->nlmsg_len = skb->tail - b;
 
@@ -2019,6 +2114,9 @@ static int xfrm_notify_policy_flush(struct km_event *c)
         struct nlmsghdr *nlh;
         struct sk_buff *skb;
         unsigned char *b;
+#ifdef CONFIG_XFRM_SUB_POLICY
+        struct xfrm_userpolicy_type upt;
+#endif
         int len = NLMSG_LENGTH(0);
 
         skb = alloc_skb(len, GFP_ATOMIC);
@@ -2028,6 +2126,13 @@ static int xfrm_notify_policy_flush(struct km_event *c)
 
 
         nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
+        nlh->nlmsg_flags = 0;
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+        memset(&upt, 0, sizeof(upt));
+        upt.type = c->data.type;
+        RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
+#endif
 
         nlh->nlmsg_len = skb->tail - b;
 
@@ -2035,6 +2140,9 @@ static int xfrm_notify_policy_flush(struct km_event *c)
         return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
 
 nlmsg_failure:
+#ifdef CONFIG_XFRM_SUB_POLICY
+rtattr_failure:
+#endif
         kfree_skb(skb);
         return -1;
 }