xfrm: MIGRATE enhancements (draft-ebalard-mext-pfkey-enhanced-migrate)
Provides implementation of the enhancements of XFRM/PF_KEY MIGRATE mechanism
specified in draft-ebalard-mext-pfkey-enhanced-migrate-00. Defines associated
PF_KEY SADB_X_EXT_KMADDRESS extension and XFRM/netlink XFRMA_KMADDRESS
attribute.
Signed-off-by: Arnaud Ebalard <arno@natisbad.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/pfkeyv2.h b/include/linux/pfkeyv2.h
index 700725d..01b2629 100644
--- a/include/linux/pfkeyv2.h
+++ b/include/linux/pfkeyv2.h
@@ -226,6 +226,15 @@
} __attribute__((packed));
/* sizeof(struct sadb_sec_ctx) = 8 */
+/* Used by MIGRATE to pass addresses IKE will use to perform
+ * negotiation with the peer */
+struct sadb_x_kmaddress {
+ uint16_t sadb_x_kmaddress_len;
+ uint16_t sadb_x_kmaddress_exttype;
+ uint32_t sadb_x_kmaddress_reserved;
+} __attribute__((packed));
+/* sizeof(struct sadb_x_kmaddress) == 8 */
+
/* Message types */
#define SADB_RESERVED 0
#define SADB_GETSPI 1
@@ -346,7 +355,9 @@
#define SADB_X_EXT_NAT_T_DPORT 22
#define SADB_X_EXT_NAT_T_OA 23
#define SADB_X_EXT_SEC_CTX 24
-#define SADB_EXT_MAX 24
+/* Used with MIGRATE to pass @ to IKE for negotiation */
+#define SADB_X_EXT_KMADDRESS 25
+#define SADB_EXT_MAX 25
/* Identity Extension values */
#define SADB_IDENTTYPE_RESERVED 0
diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index fb0c215..4bc1e6b 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -279,6 +279,7 @@
XFRMA_POLICY_TYPE, /* struct xfrm_userpolicy_type */
XFRMA_MIGRATE,
XFRMA_ALG_AEAD, /* struct xfrm_algo_aead */
+ XFRMA_KMADDRESS, /* struct xfrm_user_kmaddress */
__XFRMA_MAX
#define XFRMA_MAX (__XFRMA_MAX - 1)
@@ -415,6 +416,15 @@
struct xfrm_selector sel;
};
+/* Used by MIGRATE to pass addresses IKE should use to perform
+ * SA negotiation with the peer */
+struct xfrm_user_kmaddress {
+ xfrm_address_t local;
+ xfrm_address_t remote;
+ __u32 reserved;
+ __u16 family;
+};
+
struct xfrm_user_migrate {
xfrm_address_t old_daddr;
xfrm_address_t old_saddr;
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index b98d205..11c890a 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -492,6 +492,13 @@
struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
};
+struct xfrm_kmaddress {
+ xfrm_address_t local;
+ xfrm_address_t remote;
+ u32 reserved;
+ u16 family;
+};
+
struct xfrm_migrate {
xfrm_address_t old_daddr;
xfrm_address_t old_saddr;
@@ -531,7 +538,7 @@
int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
- int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
+ int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
};
extern int xfrm_register_km(struct xfrm_mgr *km);
@@ -1432,12 +1439,14 @@
#ifdef CONFIG_XFRM_MIGRATE
extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
- struct xfrm_migrate *m, int num_bundles);
+ struct xfrm_migrate *m, int num_bundles,
+ struct xfrm_kmaddress *k);
extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
struct xfrm_migrate *m);
extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
- struct xfrm_migrate *m, int num_bundles);
+ struct xfrm_migrate *m, int num_bundles,
+ struct xfrm_kmaddress *k);
#endif
extern wait_queue_head_t km_waitq;
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 7ae641d..362fe31 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -398,6 +398,7 @@
[SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
[SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
[SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
+ [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
};
/* Verify sadb_address_{len,prefixlen} against sa_family. */
@@ -2384,24 +2385,21 @@
return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
}
-static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq,
+static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
xfrm_address_t *saddr, xfrm_address_t *daddr,
u16 *family)
{
- u8 *sa = (u8 *) (rq + 1);
int af, socklen;
- if (rq->sadb_x_ipsecrequest_len <
- pfkey_sockaddr_pair_size(((struct sockaddr *)sa)->sa_family))
+ if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
return -EINVAL;
- af = pfkey_sockaddr_extract((struct sockaddr *) sa,
- saddr);
+ af = pfkey_sockaddr_extract(sa, saddr);
if (!af)
return -EINVAL;
socklen = pfkey_sockaddr_len(af);
- if (pfkey_sockaddr_extract((struct sockaddr *) (sa + socklen),
+ if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
daddr) != af)
return -EINVAL;
@@ -2421,7 +2419,9 @@
return -EINVAL;
/* old endoints */
- err = parse_sockaddr_pair(rq1, &m->old_saddr, &m->old_daddr,
+ err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
+ rq1->sadb_x_ipsecrequest_len,
+ &m->old_saddr, &m->old_daddr,
&m->old_family);
if (err)
return err;
@@ -2434,7 +2434,9 @@
return -EINVAL;
/* new endpoints */
- err = parse_sockaddr_pair(rq2, &m->new_saddr, &m->new_daddr,
+ err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
+ rq2->sadb_x_ipsecrequest_len,
+ &m->new_saddr, &m->new_daddr,
&m->new_family);
if (err)
return err;
@@ -2460,29 +2462,40 @@
int i, len, ret, err = -EINVAL;
u8 dir;
struct sadb_address *sa;
+ struct sadb_x_kmaddress *kma;
struct sadb_x_policy *pol;
struct sadb_x_ipsecrequest *rq;
struct xfrm_selector sel;
struct xfrm_migrate m[XFRM_MAX_DEPTH];
+ struct xfrm_kmaddress k;
if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
- ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
+ ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
!ext_hdrs[SADB_X_EXT_POLICY - 1]) {
err = -EINVAL;
goto out;
}
+ kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
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;
}
+ if (kma) {
+ /* convert sadb_x_kmaddress to xfrm_kmaddress */
+ k.reserved = kma->sadb_x_kmaddress_reserved;
+ ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
+ 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
+ &k.local, &k.remote, &k.family);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+ }
+
dir = pol->sadb_x_policy_dir - 1;
memset(&sel, 0, sizeof(sel));
@@ -2527,7 +2540,8 @@
goto out;
}
- return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i);
+ return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
+ kma ? &k : NULL);
out:
return err;
@@ -3319,6 +3333,32 @@
return 0;
}
+
+static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
+{
+ struct sadb_x_kmaddress *kma;
+ u8 *sa;
+ int family = k->family;
+ int socklen = pfkey_sockaddr_len(family);
+ int size_req;
+
+ size_req = (sizeof(struct sadb_x_kmaddress) +
+ pfkey_sockaddr_pair_size(family));
+
+ kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
+ memset(kma, 0, size_req);
+ kma->sadb_x_kmaddress_len = size_req / 8;
+ kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
+ kma->sadb_x_kmaddress_reserved = k->reserved;
+
+ sa = (u8 *)(kma + 1);
+ if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
+ !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
+ 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,
@@ -3351,7 +3391,8 @@
#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)
+ struct xfrm_migrate *m, int num_bundles,
+ struct xfrm_kmaddress *k)
{
int i;
int sasize_sel;
@@ -3368,6 +3409,12 @@
if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
return -EINVAL;
+ if (k != NULL) {
+ /* addresses for KM */
+ size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
+ pfkey_sockaddr_pair_size(k->family));
+ }
+
/* selector */
sasize_sel = pfkey_sockaddr_size(sel->family);
if (!sasize_sel)
@@ -3404,6 +3451,10 @@
hdr->sadb_msg_seq = 0;
hdr->sadb_msg_pid = 0;
+ /* Addresses to be used by KM for negotiation, if ext is available */
+ if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
+ return -EINVAL;
+
/* selector src */
set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
@@ -3449,7 +3500,8 @@
}
#else
static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
- struct xfrm_migrate *m, int num_bundles)
+ struct xfrm_migrate *m, int num_bundles,
+ struct xfrm_kmaddress *k)
{
return -ENOPROTOOPT;
}
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index b7ec080..832b47c 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2679,7 +2679,8 @@
}
int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
- struct xfrm_migrate *m, int num_migrate)
+ struct xfrm_migrate *m, int num_migrate,
+ struct xfrm_kmaddress *k)
{
int i, err, nx_cur = 0, nx_new = 0;
struct xfrm_policy *pol = NULL;
@@ -2723,7 +2724,7 @@
}
/* Stage 5 - announce */
- km_migrate(sel, dir, type, m, num_migrate);
+ km_migrate(sel, dir, type, m, num_migrate, k);
xfrm_pol_put(pol);
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 747fd8c..508337f 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1814,7 +1814,8 @@
#ifdef CONFIG_XFRM_MIGRATE
int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
- struct xfrm_migrate *m, int num_migrate)
+ struct xfrm_migrate *m, int num_migrate,
+ struct xfrm_kmaddress *k)
{
int err = -EINVAL;
int ret;
@@ -1823,7 +1824,7 @@
read_lock(&xfrm_km_lock);
list_for_each_entry(km, &xfrm_km_list, list) {
if (km->migrate) {
- ret = km->migrate(sel, dir, type, m, num_migrate);
+ ret = km->migrate(sel, dir, type, m, num_migrate, k);
if (!ret)
err = ret;
}
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 76f75df..4a8a1ab 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1710,12 +1710,23 @@
#ifdef CONFIG_XFRM_MIGRATE
static int copy_from_user_migrate(struct xfrm_migrate *ma,
+ struct xfrm_kmaddress *k,
struct nlattr **attrs, int *num)
{
struct nlattr *rt = attrs[XFRMA_MIGRATE];
struct xfrm_user_migrate *um;
int i, num_migrate;
+ if (k != NULL) {
+ struct xfrm_user_kmaddress *uk;
+
+ uk = nla_data(attrs[XFRMA_KMADDRESS]);
+ memcpy(&k->local, &uk->local, sizeof(k->local));
+ memcpy(&k->remote, &uk->remote, sizeof(k->remote));
+ k->family = uk->family;
+ k->reserved = uk->reserved;
+ }
+
um = nla_data(rt);
num_migrate = nla_len(rt) / sizeof(*um);
@@ -1745,6 +1756,7 @@
{
struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
struct xfrm_migrate m[XFRM_MAX_DEPTH];
+ struct xfrm_kmaddress km, *kmp;
u8 type;
int err;
int n = 0;
@@ -1752,19 +1764,20 @@
if (attrs[XFRMA_MIGRATE] == NULL)
return -EINVAL;
+ kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
+
err = copy_from_user_policy_type(&type, attrs);
if (err)
return err;
- err = copy_from_user_migrate((struct xfrm_migrate *)m,
- attrs, &n);
+ err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
if (err)
return err;
if (!n)
return 0;
- xfrm_migrate(&pi->sel, pi->dir, type, m, n);
+ xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
return 0;
}
@@ -1795,16 +1808,30 @@
return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
}
-static inline size_t xfrm_migrate_msgsize(int num_migrate)
+static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
+{
+ struct xfrm_user_kmaddress uk;
+
+ memset(&uk, 0, sizeof(uk));
+ uk.family = k->family;
+ uk.reserved = k->reserved;
+ memcpy(&uk.local, &k->local, sizeof(uk.local));
+ memcpy(&uk.remote, &k->local, sizeof(uk.remote));
+
+ return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
+}
+
+static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
{
return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
- + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
- + userpolicy_type_attrsize();
+ + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
+ + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
+ + userpolicy_type_attrsize();
}
static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
- int num_migrate, struct xfrm_selector *sel,
- u8 dir, u8 type)
+ int num_migrate, struct xfrm_kmaddress *k,
+ struct xfrm_selector *sel, u8 dir, u8 type)
{
struct xfrm_migrate *mp;
struct xfrm_userpolicy_id *pol_id;
@@ -1821,6 +1848,9 @@
memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
pol_id->dir = dir;
+ if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
+ goto nlmsg_failure;
+
if (copy_to_user_policy_type(type, skb) < 0)
goto nlmsg_failure;
@@ -1836,23 +1866,25 @@
}
static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
- struct xfrm_migrate *m, int num_migrate)
+ struct xfrm_migrate *m, int num_migrate,
+ struct xfrm_kmaddress *k)
{
struct sk_buff *skb;
- skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
+ skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
/* build migrate */
- if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
+ if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
BUG();
return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
}
#else
static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
- struct xfrm_migrate *m, int num_migrate)
+ struct xfrm_migrate *m, int num_migrate,
+ struct xfrm_kmaddress *k)
{
return -ENOPROTOOPT;
}
@@ -1901,6 +1933,7 @@
[XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
[XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
[XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
+ [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
};
static struct xfrm_link {
