[XFRM] STATE: Introduce care-of address.

Care-of address is carried by state as a transformation option like
IPsec encryption/authentication algorithm.

Based on MIPL2 kernel patch.

Signed-off-by: Noriaki TAKAMIYA <takamiya@po.ntts.co.jp>
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

4 files changed, 37 insertions, 1 deletions

diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index a7c9e4cfb15b..b53f799189af 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -235,6 +235,7 @@ enum xfrm_attr_type_t {
         XFRMA_REPLAY_THRESH,
         XFRMA_ETIMER_THRESH,
         XFRMA_SRCADDR,          /* xfrm_address_t */
+        XFRMA_COADDR,           /* xfrm_address_t */
         __XFRMA_MAX
 
 #define XFRMA_MAX (__XFRMA_MAX - 1)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index aa93cc1f6299..872a2a4022b2 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -134,6 +134,9 @@ struct xfrm_state
         /* Data for encapsulator */
         struct xfrm_encap_tmpl  *encap;
 
+        /* Data for care-of address */
+        xfrm_address_t  *coaddr;
+
         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
         struct xfrm_state       *tunnel;
 
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index f05371556cce..3da89c01ea71 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -78,6 +78,7 @@ static void xfrm_state_gc_destroy(struct xfrm_state *x)
         kfree(x->ealg);
         kfree(x->calg);
         kfree(x->encap);
+        kfree(x->coaddr);
         if (x->mode)
                 xfrm_put_mode(x->mode);
         if (x->type) {
@@ -603,6 +604,11 @@ out:
         if (likely(x1->km.state == XFRM_STATE_VALID)) {
                 if (x->encap && x1->encap)
                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
+                if (x->coaddr && x1->coaddr) {
+                        memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
+                }
+                if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
+                        memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
                 x1->km.dying = 0;
 
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index b5f8ab71aa54..939808de9e20 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -187,11 +187,14 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
                 goto out;
         if ((err = verify_sec_ctx_len(xfrma)))
                 goto out;
+        if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
+                goto out;
 
         err = -EINVAL;
         switch (p->mode) {
         case XFRM_MODE_TRANSPORT:
         case XFRM_MODE_TUNNEL:
+        case XFRM_MODE_ROUTEOPTIMIZATION:
                 break;
 
         default:
@@ -276,6 +279,24 @@ static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
         return security_xfrm_state_alloc(x, uctx);
 }
 
+static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
+{
+        struct rtattr *rta = u_arg;
+        xfrm_address_t *p, *uaddrp;
+
+        if (!rta)
+                return 0;
+
+        uaddrp = RTA_DATA(rta);
+        p = kmalloc(sizeof(*p), GFP_KERNEL);
+        if (!p)
+                return -ENOMEM;
+
+        memcpy(p, uaddrp, sizeof(*p));
+        *addrpp = p;
+        return 0;
+}
+
 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 {
         memcpy(&x->id, &p->id, sizeof(x->id));
@@ -365,7 +386,8 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
                 goto error;
         if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
                 goto error;
-
+        if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
+                goto error;
         err = xfrm_init_state(x);
         if (err)
                 goto error;
@@ -569,6 +591,10 @@ static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
                 uctx->ctx_len = x->security->ctx_len;
                 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
         }
+
+        if (x->coaddr)
+                RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
+
         nlh->nlmsg_len = skb->tail - b;
 out:
         sp->this_idx++;