[PFKEYV2]: Extension for dynamic update of endpoint address(es)
Extend PF_KEYv2 framework so that user application can take advantage
of MIGRATE feature via PF_KEYv2 interface. User application can either
send or receive an MIGRATE message to/from PF_KEY socket.
Detail information can be found in the internet-draft
<draft-sugimoto-mip6-pfkey-migrate>.
Signed-off-by: Shinta Sugimoto <shinta.sugimoto@ericsson.com>
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/pfkeyv2.h b/include/linux/pfkeyv2.h
index 265bafa..26a518b 100644
--- a/include/linux/pfkeyv2.h
+++ b/include/linux/pfkeyv2.h
@@ -251,7 +251,8 @@
#define SADB_X_SPDEXPIRE 21
#define SADB_X_SPDDELETE2 22
#define SADB_X_NAT_T_NEW_MAPPING 23
-#define SADB_MAX 23
+#define SADB_X_MIGRATE 24
+#define SADB_MAX 24
/* Security Association flags */
#define SADB_SAFLAGS_PFS 1
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 5dd5094..b4e4440 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -2345,6 +2345,196 @@
return err;
}
+#ifdef CONFIG_NET_KEY_MIGRATE
+static int pfkey_sockaddr_pair_size(sa_family_t family)
+{
+ switch (family) {
+ case AF_INET:
+ return PFKEY_ALIGN8(sizeof(struct sockaddr_in) * 2);
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case AF_INET6:
+ return PFKEY_ALIGN8(sizeof(struct sockaddr_in6) * 2);
+#endif
+ default:
+ return 0;
+ }
+ /* NOTREACHED */
+}
+
+static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq,
+ xfrm_address_t *saddr, xfrm_address_t *daddr,
+ u16 *family)
+{
+ struct sockaddr *sa = (struct sockaddr *)(rq + 1);
+ if (rq->sadb_x_ipsecrequest_len <
+ pfkey_sockaddr_pair_size(sa->sa_family))
+ return -EINVAL;
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ {
+ struct sockaddr_in *sin;
+ sin = (struct sockaddr_in *)sa;
+ if ((sin+1)->sin_family != AF_INET)
+ return -EINVAL;
+ memcpy(&saddr->a4, &sin->sin_addr, sizeof(saddr->a4));
+ sin++;
+ memcpy(&daddr->a4, &sin->sin_addr, sizeof(daddr->a4));
+ *family = AF_INET;
+ break;
+ }
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case AF_INET6:
+ {
+ struct sockaddr_in6 *sin6;
+ sin6 = (struct sockaddr_in6 *)sa;
+ if ((sin6+1)->sin6_family != AF_INET6)
+ return -EINVAL;
+ memcpy(&saddr->a6, &sin6->sin6_addr,
+ sizeof(saddr->a6));
+ sin6++;
+ memcpy(&daddr->a6, &sin6->sin6_addr,
+ sizeof(daddr->a6));
+ *family = AF_INET6;
+ break;
+ }
+#endif
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
+ struct xfrm_migrate *m)
+{
+ int err;
+ struct sadb_x_ipsecrequest *rq2;
+
+ if (len <= sizeof(struct sadb_x_ipsecrequest) ||
+ len < rq1->sadb_x_ipsecrequest_len)
+ return -EINVAL;
+
+ /* old endoints */
+ err = parse_sockaddr_pair(rq1, &m->old_saddr, &m->old_daddr,
+ &m->old_family);
+ if (err)
+ return err;
+
+ rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
+ len -= rq1->sadb_x_ipsecrequest_len;
+
+ if (len <= sizeof(struct sadb_x_ipsecrequest) ||
+ len < rq2->sadb_x_ipsecrequest_len)
+ return -EINVAL;
+
+ /* new endpoints */
+ err = parse_sockaddr_pair(rq2, &m->new_saddr, &m->new_daddr,
+ &m->new_family);
+ if (err)
+ return err;
+
+ if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
+ rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
+ rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
+ return -EINVAL;
+
+ m->proto = rq1->sadb_x_ipsecrequest_proto;
+ m->mode = rq1->sadb_x_ipsecrequest_mode - 1;
+ m->reqid = rq1->sadb_x_ipsecrequest_reqid;
+
+ return ((int)(rq1->sadb_x_ipsecrequest_len +
+ rq2->sadb_x_ipsecrequest_len));
+}
+
+static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
+ struct sadb_msg *hdr, void **ext_hdrs)
+{
+ int i, len, ret, err = -EINVAL;
+ u8 dir;
+ struct sadb_address *sa;
+ struct sadb_x_policy *pol;
+ struct sadb_x_ipsecrequest *rq;
+ struct xfrm_selector sel;
+ struct xfrm_migrate m[XFRM_MAX_DEPTH];
+
+ if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
+ ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
+ !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
+ if (!pol) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ dir = pol->sadb_x_policy_dir - 1;
+ memset(&sel, 0, sizeof(sel));
+
+ /* set source address info of selector */
+ sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
+ sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
+ sel.prefixlen_s = sa->sadb_address_prefixlen;
+ sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
+ sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
+ if (sel.sport)
+ sel.sport_mask = ~0;
+
+ /* set destination address info of selector */
+ sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
+ pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
+ sel.prefixlen_d = sa->sadb_address_prefixlen;
+ sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
+ sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
+ if (sel.dport)
+ sel.dport_mask = ~0;
+
+ rq = (struct sadb_x_ipsecrequest *)(pol + 1);
+
+ /* extract ipsecrequests */
+ i = 0;
+ len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
+
+ while (len > 0 && i < XFRM_MAX_DEPTH) {
+ ret = ipsecrequests_to_migrate(rq, len, &m[i]);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ } else {
+ rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
+ len -= ret;
+ i++;
+ }
+ }
+
+ if (!i || len > 0) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i);
+
+ out:
+ return err;
+}
+#else
+static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
+ struct sadb_msg *hdr, void **ext_hdrs)
+{
+ return -ENOPROTOOPT;
+}
+#endif
+
+
static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
unsigned int dir;
@@ -2473,6 +2663,7 @@
[SADB_X_SPDFLUSH] = pfkey_spdflush,
[SADB_X_SPDSETIDX] = pfkey_spdadd,
[SADB_X_SPDDELETE2] = pfkey_spdget,
+ [SADB_X_MIGRATE] = pfkey_migrate,
};
static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
@@ -3118,6 +3309,236 @@
return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
}
+#ifdef CONFIG_NET_KEY_MIGRATE
+static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
+ struct xfrm_selector *sel)
+{
+ struct sadb_address *addr;
+ struct sockaddr_in *sin;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ struct sockaddr_in6 *sin6;
+#endif
+ addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
+ addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
+ addr->sadb_address_exttype = type;
+ addr->sadb_address_proto = sel->proto;
+ addr->sadb_address_reserved = 0;
+
+ switch (type) {
+ case SADB_EXT_ADDRESS_SRC:
+ if (sel->family == AF_INET) {
+ addr->sadb_address_prefixlen = sel->prefixlen_s;
+ sin = (struct sockaddr_in *)(addr + 1);
+ sin->sin_family = AF_INET;
+ memcpy(&sin->sin_addr.s_addr, &sel->saddr,
+ sizeof(sin->sin_addr.s_addr));
+ sin->sin_port = 0;
+ memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+ }
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ else if (sel->family == AF_INET6) {
+ addr->sadb_address_prefixlen = sel->prefixlen_s;
+ sin6 = (struct sockaddr_in6 *)(addr + 1);
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = 0;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0;
+ memcpy(&sin6->sin6_addr.s6_addr, &sel->saddr,
+ sizeof(sin6->sin6_addr.s6_addr));
+ }
+#endif
+ break;
+ case SADB_EXT_ADDRESS_DST:
+ if (sel->family == AF_INET) {
+ addr->sadb_address_prefixlen = sel->prefixlen_d;
+ sin = (struct sockaddr_in *)(addr + 1);
+ sin->sin_family = AF_INET;
+ memcpy(&sin->sin_addr.s_addr, &sel->daddr,
+ sizeof(sin->sin_addr.s_addr));
+ sin->sin_port = 0;
+ memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+ }
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ else if (sel->family == AF_INET6) {
+ addr->sadb_address_prefixlen = sel->prefixlen_d;
+ sin6 = (struct sockaddr_in6 *)(addr + 1);
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = 0;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0;
+ memcpy(&sin6->sin6_addr.s6_addr, &sel->daddr,
+ sizeof(sin6->sin6_addr.s6_addr));
+ }
+#endif
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int set_ipsecrequest(struct sk_buff *skb,
+ uint8_t proto, uint8_t mode, int level,
+ uint32_t reqid, uint8_t family,
+ xfrm_address_t *src, xfrm_address_t *dst)
+{
+ struct sadb_x_ipsecrequest *rq;
+ struct sockaddr_in *sin;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ struct sockaddr_in6 *sin6;
+#endif
+ int size_req;
+
+ size_req = sizeof(struct sadb_x_ipsecrequest) +
+ pfkey_sockaddr_pair_size(family);
+
+ rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
+ memset(rq, 0, size_req);
+ rq->sadb_x_ipsecrequest_len = size_req;
+ rq->sadb_x_ipsecrequest_proto = proto;
+ rq->sadb_x_ipsecrequest_mode = mode;
+ rq->sadb_x_ipsecrequest_level = level;
+ rq->sadb_x_ipsecrequest_reqid = reqid;
+
+ switch (family) {
+ case AF_INET:
+ sin = (struct sockaddr_in *)(rq + 1);
+ sin->sin_family = AF_INET;
+ memcpy(&sin->sin_addr.s_addr, src,
+ sizeof(sin->sin_addr.s_addr));
+ sin++;
+ sin->sin_family = AF_INET;
+ memcpy(&sin->sin_addr.s_addr, dst,
+ sizeof(sin->sin_addr.s_addr));
+ break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ case AF_INET6:
+ sin6 = (struct sockaddr_in6 *)(rq + 1);
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = 0;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0;
+ memcpy(&sin6->sin6_addr.s6_addr, src,
+ sizeof(sin6->sin6_addr.s6_addr));
+ sin6++;
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = 0;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0;
+ memcpy(&sin6->sin6_addr.s6_addr, dst,
+ sizeof(sin6->sin6_addr.s6_addr));
+ break;
+#endif
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_NET_KEY_MIGRATE
+static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
+ struct xfrm_migrate *m, int num_bundles)
+{
+ int i;
+ int sasize_sel;
+ int size = 0;
+ int size_pol = 0;
+ struct sk_buff *skb;
+ struct sadb_msg *hdr;
+ struct sadb_x_policy *pol;
+ struct xfrm_migrate *mp;
+
+ if (type != XFRM_POLICY_TYPE_MAIN)
+ return 0;
+
+ if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
+ return -EINVAL;
+
+ /* selector */
+ sasize_sel = pfkey_sockaddr_size(sel->family);
+ if (!sasize_sel)
+ return -EINVAL;
+ size += (sizeof(struct sadb_address) + sasize_sel) * 2;
+
+ /* policy info */
+ size_pol += sizeof(struct sadb_x_policy);
+
+ /* ipsecrequests */
+ for (i = 0, mp = m; i < num_bundles; i++, mp++) {
+ /* old locator pair */
+ size_pol += sizeof(struct sadb_x_ipsecrequest) +
+ pfkey_sockaddr_pair_size(mp->old_family);
+ /* new locator pair */
+ size_pol += sizeof(struct sadb_x_ipsecrequest) +
+ pfkey_sockaddr_pair_size(mp->new_family);
+ }
+
+ size += sizeof(struct sadb_msg) + size_pol;
+
+ /* alloc buffer */
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (skb == NULL)
+ return -ENOMEM;
+
+ hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
+ hdr->sadb_msg_version = PF_KEY_V2;
+ hdr->sadb_msg_type = SADB_X_MIGRATE;
+ hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
+ hdr->sadb_msg_len = size / 8;
+ hdr->sadb_msg_errno = 0;
+ hdr->sadb_msg_reserved = 0;
+ hdr->sadb_msg_seq = 0;
+ hdr->sadb_msg_pid = 0;
+
+ /* selector src */
+ set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
+
+ /* selector dst */
+ set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
+
+ /* policy information */
+ pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
+ pol->sadb_x_policy_len = size_pol / 8;
+ pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
+ pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
+ pol->sadb_x_policy_dir = dir + 1;
+ pol->sadb_x_policy_id = 0;
+ pol->sadb_x_policy_priority = 0;
+
+ for (i = 0, mp = m; i < num_bundles; i++, mp++) {
+ /* old ipsecrequest */
+ if (set_ipsecrequest(skb, mp->proto, mp->mode + 1,
+ (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
+ mp->reqid, mp->old_family,
+ &mp->old_saddr, &mp->old_daddr) < 0) {
+ return -EINVAL;
+ }
+
+ /* new ipsecrequest */
+ if (set_ipsecrequest(skb, mp->proto, mp->mode + 1,
+ (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
+ mp->reqid, mp->new_family,
+ &mp->new_saddr, &mp->new_daddr) < 0) {
+ return -EINVAL;
+ }
+ }
+
+ /* broadcast migrate message to sockets */
+ pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
+
+ return 0;
+}
+#else
+static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
+ struct xfrm_migrate *m, int num_bundles)
+{
+ return -ENOPROTOOPT;
+}
+#endif
+
static int pfkey_sendmsg(struct kiocb *kiocb,
struct socket *sock, struct msghdr *msg, size_t len)
{
@@ -3287,6 +3708,7 @@
.compile_policy = pfkey_compile_policy,
.new_mapping = pfkey_send_new_mapping,
.notify_policy = pfkey_send_policy_notify,
+ .migrate = pfkey_send_migrate,
};
static void __exit ipsec_pfkey_exit(void)