[XFRM] STATE: Search by address using source address list.

This is a support to search transformation states by its addresses
by using source address list for Mobile IPv6 usage.
To use it from user-space, it is also added a message type for
source address as a xfrm state option.
Based on MIPL2 kernel patch.

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>

diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index 5154064..66343d3 100644 (file)
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -234,6 +234,7 @@ enum xfrm_attr_type_t {
        XFRMA_REPLAY_VAL,
        XFRMA_REPLAY_THRESH,
        XFRMA_ETIMER_THRESH,
+       XFRMA_SRCADDR,          /* xfrm_address_t */
        __XFRMA_MAX
 
 #define XFRMA_MAX (__XFRMA_MAX - 1)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 88145e3..d9c40e7 100644 (file)
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -244,6 +244,7 @@ struct xfrm_state_afinfo {
                                                struct xfrm_tmpl *tmpl,
                                                xfrm_address_t *daddr, xfrm_address_t *saddr);
        struct xfrm_state       *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
+       struct xfrm_state       *(*state_lookup_byaddr)(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto);
        struct xfrm_state       *(*find_acq)(u8 mode, u32 reqid, u8 proto, 
                                             xfrm_address_t *daddr, xfrm_address_t *saddr, 
                                             int create);
@@ -937,6 +938,7 @@ extern void xfrm_state_insert(struct xfrm_state *x);
 extern int xfrm_state_add(struct xfrm_state *x);
 extern int xfrm_state_update(struct xfrm_state *x);
 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
+extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
 extern int xfrm_state_delete(struct xfrm_state *x);
 extern void xfrm_state_flush(u8 proto);

diff --git a/net/ipv4/xfrm4_state.c b/net/ipv4/xfrm4_state.c
index c56b258..616be13 100644 (file)
--- a/net/ipv4/xfrm4_state.c
+++ b/net/ipv4/xfrm4_state.c
@@ -80,6 +80,14 @@ __xfrm4_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
        return NULL;
 }
 
+/* placeholder until ipv4's code is written */
+static struct xfrm_state *
+__xfrm4_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
+                           u8 proto)
+{
+       return NULL;
+}
+
 static struct xfrm_state *
 __xfrm4_find_acq(u8 mode, u32 reqid, u8 proto, 
                 xfrm_address_t *daddr, xfrm_address_t *saddr, 
@@ -137,6 +145,7 @@ static struct xfrm_state_afinfo xfrm4_state_afinfo = {
        .init_flags             = xfrm4_init_flags,
        .init_tempsel           = __xfrm4_init_tempsel,
        .state_lookup           = __xfrm4_state_lookup,
+       .state_lookup_byaddr    = __xfrm4_state_lookup_byaddr,
        .find_acq               = __xfrm4_find_acq,
 };
 

diff --git a/net/ipv6/xfrm6_state.c b/net/ipv6/xfrm6_state.c
index 2fb0785..9c95b9d 100644 (file)
--- a/net/ipv6/xfrm6_state.c
+++ b/net/ipv6/xfrm6_state.c
@@ -63,6 +63,26 @@ __xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
        x->props.family = AF_INET6;
 }
 
+static struct xfrm_state *
+__xfrm6_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
+                           u8 proto)
+{
+       struct xfrm_state *x = NULL;
+       unsigned h;
+
+       h = __xfrm6_src_hash(saddr);
+       list_for_each_entry(x, xfrm6_state_afinfo.state_bysrc+h, bysrc) {
+               if (x->props.family == AF_INET6 &&
+                   ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
+                   ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
+                   proto == x->id.proto) {
+                       xfrm_state_hold(x);
+                       return x;
+               }
+       }
+       return NULL;
+}
+
 static struct xfrm_state *
 __xfrm6_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
 {
@@ -140,6 +160,7 @@ static struct xfrm_state_afinfo xfrm6_state_afinfo = {
        .family                 = AF_INET6,
        .init_tempsel           = __xfrm6_init_tempsel,
        .state_lookup           = __xfrm6_state_lookup,
+       .state_lookup_byaddr    = __xfrm6_state_lookup_byaddr,
        .find_acq               = __xfrm6_find_acq,
 };
 

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 2a99928..11f480b 100644 (file)
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -487,6 +487,16 @@ void xfrm_state_insert(struct xfrm_state *x)
 }
 EXPORT_SYMBOL(xfrm_state_insert);
 
+static inline struct xfrm_state *
+__xfrm_state_locate(struct xfrm_state_afinfo *afinfo, struct xfrm_state *x,
+                   int use_spi)
+{
+       if (use_spi)
+               return afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
+       else
+               return afinfo->state_lookup_byaddr(&x->id.daddr, &x->props.saddr, x->id.proto);
+}
+
 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq);
 
 int xfrm_state_add(struct xfrm_state *x)
@@ -495,6 +505,7 @@ int xfrm_state_add(struct xfrm_state *x)
        struct xfrm_state *x1;
        int family;
        int err;
+       int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
 
        family = x->props.family;
        afinfo = xfrm_state_get_afinfo(family);
@@ -503,7 +514,7 @@ int xfrm_state_add(struct xfrm_state *x)
 
        spin_lock_bh(&xfrm_state_lock);
 
-       x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
+       x1 = __xfrm_state_locate(afinfo, x, use_spi);
        if (x1) {
                xfrm_state_put(x1);
                x1 = NULL;
@@ -511,7 +522,7 @@ int xfrm_state_add(struct xfrm_state *x)
                goto out;
        }
 
-       if (x->km.seq) {
+       if (use_spi && x->km.seq) {
                x1 = __xfrm_find_acq_byseq(x->km.seq);
                if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) {
                        xfrm_state_put(x1);
@@ -519,7 +530,7 @@ int xfrm_state_add(struct xfrm_state *x)
                }
        }
 
-       if (!x1)
+       if (use_spi && !x1)
                x1 = afinfo->find_acq(
                        x->props.mode, x->props.reqid, x->id.proto,
                        &x->id.daddr, &x->props.saddr, 0);
@@ -548,13 +559,14 @@ int xfrm_state_update(struct xfrm_state *x)
        struct xfrm_state_afinfo *afinfo;
        struct xfrm_state *x1;
        int err;
+       int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
 
        afinfo = xfrm_state_get_afinfo(x->props.family);
        if (unlikely(afinfo == NULL))
                return -EAFNOSUPPORT;
 
        spin_lock_bh(&xfrm_state_lock);
-       x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
+       x1 = __xfrm_state_locate(afinfo, x, use_spi);
 
        err = -ESRCH;
        if (!x1)
@@ -674,6 +686,23 @@ xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto,
 }
 EXPORT_SYMBOL(xfrm_state_lookup);
 
+struct xfrm_state *
+xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
+                        u8 proto, unsigned short family)
+{
+       struct xfrm_state *x;
+       struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
+       if (!afinfo)
+               return NULL;
+
+       spin_lock_bh(&xfrm_state_lock);
+       x = afinfo->state_lookup_byaddr(daddr, saddr, proto);
+       spin_unlock_bh(&xfrm_state_lock);
+       xfrm_state_put_afinfo(afinfo);
+       return x;
+}
+EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
+
 struct xfrm_state *
 xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 
              xfrm_address_t *daddr, xfrm_address_t *saddr, 

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 41f3d51..b5f8ab7 100644 (file)
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -87,6 +87,22 @@ static int verify_encap_tmpl(struct rtattr **xfrma)
        return 0;
 }
 
+static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
+                          xfrm_address_t **addrp)
+{
+       struct rtattr *rt = xfrma[type - 1];
+
+       if (!rt)
+               return 0;
+
+       if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
+               return -EINVAL;
+
+       if (addrp)
+               *addrp = RTA_DATA(rt);
+
+       return 0;
+}
 
 static inline int verify_sec_ctx_len(struct rtattr **xfrma)
 {
@@ -418,16 +434,48 @@ out:
        return err;
 }
 
+static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
+                                                struct rtattr **xfrma,
+                                                int *errp)
+{
+       struct xfrm_state *x = NULL;
+       int err;
+
+       if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
+               err = -ESRCH;
+               x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
+       } else {
+               xfrm_address_t *saddr = NULL;
+
+               err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
+               if (err)
+                       goto out;
+
+               if (!saddr) {
+                       err = -EINVAL;
+                       goto out;
+               }
+
+               x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
+                                            p->family);
+       }
+
+ out:
+       if (!x && errp)
+               *errp = err;
+       return x;
+}
+
 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
 {
        struct xfrm_state *x;
-       int err;
+       int err = -ESRCH;
        struct km_event c;
        struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
 
-       x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
+       x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
        if (x == NULL)
-               return -ESRCH;
+               return err;
 
        if ((err = security_xfrm_state_delete(x)) != 0)
                goto out;
@@ -578,10 +626,9 @@ static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
        struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
        struct xfrm_state *x;
        struct sk_buff *resp_skb;
-       int err;
+       int err = -ESRCH;
 
-       x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
-       err = -ESRCH;
+       x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
        if (x == NULL)
                goto out_noput;