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[XFRM]: User interface for handling XFRM_MSG_MIGRATE
Add user interface for handling XFRM_MSG_MIGRATE. The message is issued by user application. When kernel receives the message, procedure of updating XFRM databases will take place. 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>
This commit is contained in:
Shinta Sugimoto
David S. Miller
parent
80c9abaabf
commit
5c79de6e79
@ -1632,6 +1632,176 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
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return 0;
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}
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#ifdef CONFIG_XFRM_MIGRATE
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static int verify_user_migrate(struct rtattr **xfrma)
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{
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struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
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struct xfrm_user_migrate *um;
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if (!rt)
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return -EINVAL;
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if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
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return -EINVAL;
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return 0;
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}
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static int copy_from_user_migrate(struct xfrm_migrate *ma,
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struct rtattr **xfrma, int *num)
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{
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struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
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struct xfrm_user_migrate *um;
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int i, num_migrate;
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um = RTA_DATA(rt);
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num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um);
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if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
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return -EINVAL;
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for (i = 0; i < num_migrate; i++, um++, ma++) {
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memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
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memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
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memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
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memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
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ma->proto = um->proto;
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ma->mode = um->mode;
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ma->reqid = um->reqid;
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ma->old_family = um->old_family;
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ma->new_family = um->new_family;
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}
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*num = i;
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return 0;
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}
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static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct rtattr **xfrma)
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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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u8 type;
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int err;
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int n = 0;
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err = verify_user_migrate((struct rtattr **)xfrma);
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if (err)
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return err;
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err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
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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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(struct rtattr **)xfrma, &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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return 0;
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}
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#else
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static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct rtattr **xfrma)
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{
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return -ENOPROTOOPT;
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}
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#endif
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#ifdef CONFIG_XFRM_MIGRATE
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static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
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{
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struct xfrm_user_migrate um;
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memset(&um, 0, sizeof(um));
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um.proto = m->proto;
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um.mode = m->mode;
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um.reqid = m->reqid;
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um.old_family = m->old_family;
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memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
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memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
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um.new_family = m->new_family;
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memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
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memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
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RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
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return 0;
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rtattr_failure:
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return -1;
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}
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static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
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int num_migrate, struct xfrm_selector *sel,
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u8 dir, u8 type)
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{
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struct xfrm_migrate *mp;
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struct xfrm_userpolicy_id *pol_id;
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struct nlmsghdr *nlh;
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unsigned char *b = skb->tail;
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int i;
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nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
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pol_id = NLMSG_DATA(nlh);
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nlh->nlmsg_flags = 0;
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/* copy data from selector, dir, and type to the pol_id */
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memset(pol_id, 0, sizeof(*pol_id));
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memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
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pol_id->dir = dir;
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if (copy_to_user_policy_type(type, skb) < 0)
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goto nlmsg_failure;
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for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
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if (copy_to_user_migrate(mp, skb) < 0)
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goto nlmsg_failure;
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}
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nlh->nlmsg_len = skb->tail - b;
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return skb->len;
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nlmsg_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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}
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static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_migrate *m, int num_migrate)
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{
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struct sk_buff *skb;
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size_t len;
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len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
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len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
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#ifdef CONFIG_XFRM_SUB_POLICY
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len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
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#endif
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skb = alloc_skb(len, GFP_ATOMIC);
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if (skb == NULL)
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return -ENOMEM;
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/* build migrate */
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if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
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BUG();
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NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
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return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE,
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GFP_ATOMIC);
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}
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#else
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static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
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struct xfrm_migrate *m, int num_migrate)
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{
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return -ENOPROTOOPT;
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}
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#endif
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#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
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@ -1653,6 +1823,7 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
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[XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
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[XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
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[XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
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[XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
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};
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#undef XMSGSIZE
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@ -1679,6 +1850,7 @@ static struct xfrm_link {
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[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
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[XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
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[XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
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[XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
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};
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static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
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@ -2285,6 +2457,7 @@ static struct xfrm_mgr netlink_mgr = {
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.compile_policy = xfrm_compile_policy,
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.notify_policy = xfrm_send_policy_notify,
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.report = xfrm_send_report,
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.migrate = xfrm_send_migrate,
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};
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static int __init xfrm_user_init(void)
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