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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>
This commit is contained in:
Arnaud Ebalard
David S. Miller
parent
95430c0b14
commit
13c1d18931
@ -226,6 +226,15 @@ struct sadb_x_sec_ctx {
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} __attribute__((packed));
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/* sizeof(struct sadb_sec_ctx) = 8 */
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/* Used by MIGRATE to pass addresses IKE will use to perform
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* negotiation with the peer */
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struct sadb_x_kmaddress {
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uint16_t sadb_x_kmaddress_len;
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uint16_t sadb_x_kmaddress_exttype;
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uint32_t sadb_x_kmaddress_reserved;
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} __attribute__((packed));
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/* sizeof(struct sadb_x_kmaddress) == 8 */
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/* Message types */
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#define SADB_RESERVED 0
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#define SADB_GETSPI 1
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@ -346,7 +355,9 @@ struct sadb_x_sec_ctx {
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#define SADB_X_EXT_NAT_T_DPORT 22
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#define SADB_X_EXT_NAT_T_OA 23
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#define SADB_X_EXT_SEC_CTX 24
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#define SADB_EXT_MAX 24
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/* Used with MIGRATE to pass @ to IKE for negotiation */
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#define SADB_X_EXT_KMADDRESS 25
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#define SADB_EXT_MAX 25
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/* Identity Extension values */
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#define SADB_IDENTTYPE_RESERVED 0
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@ -279,6 +279,7 @@ enum xfrm_attr_type_t {
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XFRMA_POLICY_TYPE, /* struct xfrm_userpolicy_type */
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XFRMA_MIGRATE,
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XFRMA_ALG_AEAD, /* struct xfrm_algo_aead */
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XFRMA_KMADDRESS, /* struct xfrm_user_kmaddress */
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__XFRMA_MAX
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#define XFRMA_MAX (__XFRMA_MAX - 1)
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@ -415,6 +416,15 @@ struct xfrm_user_report {
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struct xfrm_selector sel;
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};
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/* Used by MIGRATE to pass addresses IKE should use to perform
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* SA negotiation with the peer */
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struct xfrm_user_kmaddress {
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xfrm_address_t local;
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xfrm_address_t remote;
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__u32 reserved;
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__u16 family;
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};
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struct xfrm_user_migrate {
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xfrm_address_t old_daddr;
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xfrm_address_t old_saddr;
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@ -492,6 +492,13 @@ struct xfrm_policy
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struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
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};
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struct xfrm_kmaddress {
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xfrm_address_t local;
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xfrm_address_t remote;
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u32 reserved;
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u16 family;
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};
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struct xfrm_migrate {
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xfrm_address_t old_daddr;
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xfrm_address_t old_saddr;
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@ -531,7 +538,7 @@ struct xfrm_mgr
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int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
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int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
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int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
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int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
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int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
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};
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extern int xfrm_register_km(struct xfrm_mgr *km);
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@ -1432,12 +1439,14 @@ extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
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#ifdef CONFIG_XFRM_MIGRATE
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extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_migrate *m, int num_bundles);
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struct xfrm_migrate *m, int num_bundles,
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struct xfrm_kmaddress *k);
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extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
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extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
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struct xfrm_migrate *m);
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extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_migrate *m, int num_bundles);
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struct xfrm_migrate *m, int num_bundles,
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struct xfrm_kmaddress *k);
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#endif
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extern wait_queue_head_t km_waitq;
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@ -398,6 +398,7 @@ static u8 sadb_ext_min_len[] = {
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[SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
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[SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
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[SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
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[SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
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};
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/* Verify sadb_address_{len,prefixlen} against sa_family. */
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@ -2384,24 +2385,21 @@ static int pfkey_sockaddr_pair_size(sa_family_t family)
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return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
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}
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static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq,
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static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
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xfrm_address_t *saddr, xfrm_address_t *daddr,
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u16 *family)
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{
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u8 *sa = (u8 *) (rq + 1);
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int af, socklen;
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if (rq->sadb_x_ipsecrequest_len <
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pfkey_sockaddr_pair_size(((struct sockaddr *)sa)->sa_family))
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if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
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return -EINVAL;
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af = pfkey_sockaddr_extract((struct sockaddr *) sa,
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saddr);
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af = pfkey_sockaddr_extract(sa, saddr);
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if (!af)
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return -EINVAL;
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socklen = pfkey_sockaddr_len(af);
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if (pfkey_sockaddr_extract((struct sockaddr *) (sa + socklen),
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if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
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daddr) != af)
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return -EINVAL;
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@ -2421,7 +2419,9 @@ static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
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return -EINVAL;
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/* old endoints */
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err = parse_sockaddr_pair(rq1, &m->old_saddr, &m->old_daddr,
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err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
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rq1->sadb_x_ipsecrequest_len,
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&m->old_saddr, &m->old_daddr,
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&m->old_family);
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if (err)
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return err;
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@ -2434,7 +2434,9 @@ static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
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return -EINVAL;
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/* new endpoints */
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err = parse_sockaddr_pair(rq2, &m->new_saddr, &m->new_daddr,
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err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
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rq2->sadb_x_ipsecrequest_len,
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&m->new_saddr, &m->new_daddr,
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&m->new_family);
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if (err)
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return err;
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@ -2460,29 +2462,40 @@ static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
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int i, len, ret, err = -EINVAL;
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u8 dir;
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struct sadb_address *sa;
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struct sadb_x_kmaddress *kma;
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struct sadb_x_policy *pol;
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struct sadb_x_ipsecrequest *rq;
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struct xfrm_selector sel;
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struct xfrm_migrate m[XFRM_MAX_DEPTH];
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struct xfrm_kmaddress k;
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if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
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ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
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ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
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!ext_hdrs[SADB_X_EXT_POLICY - 1]) {
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err = -EINVAL;
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goto out;
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}
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kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
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pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
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if (!pol) {
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err = -EINVAL;
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goto out;
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}
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if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
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err = -EINVAL;
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goto out;
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}
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if (kma) {
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/* convert sadb_x_kmaddress to xfrm_kmaddress */
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k.reserved = kma->sadb_x_kmaddress_reserved;
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ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
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8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
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&k.local, &k.remote, &k.family);
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if (ret < 0) {
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err = ret;
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goto out;
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}
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}
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dir = pol->sadb_x_policy_dir - 1;
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memset(&sel, 0, sizeof(sel));
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@ -2527,7 +2540,8 @@ static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
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goto out;
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}
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return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i);
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return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
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kma ? &k : NULL);
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out:
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return err;
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@ -3319,6 +3333,32 @@ static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
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return 0;
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}
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static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
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{
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struct sadb_x_kmaddress *kma;
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u8 *sa;
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int family = k->family;
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int socklen = pfkey_sockaddr_len(family);
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int size_req;
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size_req = (sizeof(struct sadb_x_kmaddress) +
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pfkey_sockaddr_pair_size(family));
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kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
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memset(kma, 0, size_req);
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kma->sadb_x_kmaddress_len = size_req / 8;
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kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
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kma->sadb_x_kmaddress_reserved = k->reserved;
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sa = (u8 *)(kma + 1);
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if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
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!pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
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return -EINVAL;
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return 0;
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}
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static int set_ipsecrequest(struct sk_buff *skb,
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uint8_t proto, uint8_t mode, int level,
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uint32_t reqid, uint8_t family,
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@ -3351,7 +3391,8 @@ static int set_ipsecrequest(struct sk_buff *skb,
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#ifdef CONFIG_NET_KEY_MIGRATE
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static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_migrate *m, int num_bundles)
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struct xfrm_migrate *m, int num_bundles,
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struct xfrm_kmaddress *k)
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{
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int i;
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int sasize_sel;
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@ -3368,6 +3409,12 @@ static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
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return -EINVAL;
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if (k != NULL) {
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/* addresses for KM */
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size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
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pfkey_sockaddr_pair_size(k->family));
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}
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/* selector */
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sasize_sel = pfkey_sockaddr_size(sel->family);
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if (!sasize_sel)
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@ -3404,6 +3451,10 @@ static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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hdr->sadb_msg_seq = 0;
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hdr->sadb_msg_pid = 0;
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/* Addresses to be used by KM for negotiation, if ext is available */
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if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
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return -EINVAL;
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/* selector src */
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set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
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@ -3449,7 +3500,8 @@ err:
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}
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#else
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static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_migrate *m, int num_bundles)
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struct xfrm_migrate *m, int num_bundles,
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struct xfrm_kmaddress *k)
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{
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return -ENOPROTOOPT;
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}
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@ -2679,7 +2679,8 @@ static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
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}
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int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_migrate *m, int num_migrate)
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struct xfrm_migrate *m, int num_migrate,
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struct xfrm_kmaddress *k)
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{
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int i, err, nx_cur = 0, nx_new = 0;
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struct xfrm_policy *pol = NULL;
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@ -2723,7 +2724,7 @@ int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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}
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/* Stage 5 - announce */
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km_migrate(sel, dir, type, m, num_migrate);
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km_migrate(sel, dir, type, m, num_migrate, k);
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xfrm_pol_put(pol);
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@ -1814,7 +1814,8 @@ EXPORT_SYMBOL(km_policy_expired);
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#ifdef CONFIG_XFRM_MIGRATE
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int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_migrate *m, int num_migrate)
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struct xfrm_migrate *m, int num_migrate,
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struct xfrm_kmaddress *k)
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{
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int err = -EINVAL;
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int ret;
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@ -1823,7 +1824,7 @@ int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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read_lock(&xfrm_km_lock);
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list_for_each_entry(km, &xfrm_km_list, list) {
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if (km->migrate) {
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ret = km->migrate(sel, dir, type, m, num_migrate);
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ret = km->migrate(sel, dir, type, m, num_migrate, k);
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if (!ret)
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err = ret;
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}
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@ -1710,12 +1710,23 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
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#ifdef CONFIG_XFRM_MIGRATE
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static int copy_from_user_migrate(struct xfrm_migrate *ma,
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struct xfrm_kmaddress *k,
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struct nlattr **attrs, int *num)
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{
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struct nlattr *rt = attrs[XFRMA_MIGRATE];
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struct xfrm_user_migrate *um;
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int i, num_migrate;
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if (k != NULL) {
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struct xfrm_user_kmaddress *uk;
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uk = nla_data(attrs[XFRMA_KMADDRESS]);
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memcpy(&k->local, &uk->local, sizeof(k->local));
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memcpy(&k->remote, &uk->remote, sizeof(k->remote));
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k->family = uk->family;
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k->reserved = uk->reserved;
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}
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um = nla_data(rt);
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num_migrate = nla_len(rt) / sizeof(*um);
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@ -1745,6 +1756,7 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
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{
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struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
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struct xfrm_migrate m[XFRM_MAX_DEPTH];
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struct xfrm_kmaddress km, *kmp;
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u8 type;
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int err;
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int n = 0;
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@ -1752,19 +1764,20 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
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if (attrs[XFRMA_MIGRATE] == NULL)
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return -EINVAL;
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kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
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err = copy_from_user_policy_type(&type, attrs);
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if (err)
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return err;
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err = copy_from_user_migrate((struct xfrm_migrate *)m,
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attrs, &n);
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err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
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if (err)
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return err;
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if (!n)
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return 0;
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xfrm_migrate(&pi->sel, pi->dir, type, m, n);
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xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
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return 0;
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}
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@ -1795,16 +1808,30 @@ static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
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return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
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}
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static inline size_t xfrm_migrate_msgsize(int num_migrate)
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static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
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{
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struct xfrm_user_kmaddress uk;
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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 @@ static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
|
||||
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 @@ nlmsg_failure:
|
||||
}
|
||||
|
||||
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 @@ static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
|
||||
[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 {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user