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xfrm: Allow user space manipulation of SPD mark 

Add ability for netlink userspace to manipulate the SPD
and manipulate the mark, retrieve it and get events with a defined
mark, etc.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2010-02-22 11:33:00 +00:00 committed by David S. Miller
parent 6f26b61e17
commit 295fae5688
1 changed files with 25 additions and 6 deletions
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31
net/xfrm/xfrm_user.c
View File

@ -31,8 +31,6 @@
#include <linux/in6.h>
#endif
#define DUMMY_MARK 0
static inline int aead_len(struct xfrm_algo_aead *alg)
{
return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
@ -1234,6 +1232,8 @@ static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_us
if (err)
goto error;
xfrm_mark_get(attrs, &xp->mark);
return xp;
error:
*errp = err;
@ -1380,10 +1380,13 @@ static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr
goto nlmsg_failure;
if (copy_to_user_policy_type(xp->type, skb) < 0)
goto nlmsg_failure;
if (xfrm_mark_put(skb, &xp->mark))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
@ -1455,6 +1458,8 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
int err;
struct km_event c;
int delete;
struct xfrm_mark m;
u32 mark = xfrm_mark_get(attrs, &m);
p = nlmsg_data(nlh);
delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
@ -1468,7 +1473,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
return err;
if (p->index)
xp = xfrm_policy_byid(net, DUMMY_MARK, type, p->dir, p->index, delete, &err);
xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
else {
struct nlattr *rt = attrs[XFRMA_SEC_CTX];
struct xfrm_sec_ctx *ctx;
@ -1485,7 +1490,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err)
return err;
}
xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, type, p->dir, &p->sel,
xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
ctx, delete, &err);
security_xfrm_policy_free(ctx);
}
@ -1729,13 +1734,15 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
struct xfrm_userpolicy_info *p = &up->pol;
u8 type = XFRM_POLICY_TYPE_MAIN;
int err = -ENOENT;
struct xfrm_mark m;
u32 mark = xfrm_mark_get(attrs, &m);
err = copy_from_user_policy_type(&type, attrs);
if (err)
return err;
if (p->index)
xp = xfrm_policy_byid(net, DUMMY_MARK, type, p->dir, p->index, 0, &err);
xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
else {
struct nlattr *rt = attrs[XFRMA_SEC_CTX];
struct xfrm_sec_ctx *ctx;
@ -1752,7 +1759,7 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err)
return err;
}
xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, type, p->dir,
xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
&p->sel, ctx, 0, &err);
security_xfrm_policy_free(ctx);
}
@ -2424,9 +2431,12 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
goto nlmsg_failure;
if (copy_to_user_policy_type(xp->type, skb) < 0)
goto nlmsg_failure;
if (xfrm_mark_put(skb, &xp->mark))
goto nla_put_failure;
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
@ -2513,6 +2523,7 @@ static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
+ nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
+ nla_total_size(xfrm_user_sec_ctx_size(xp->security))
+ nla_total_size(sizeof(struct xfrm_mark))
+ userpolicy_type_attrsize();
}
@ -2535,10 +2546,13 @@ static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
goto nlmsg_failure;
if (copy_to_user_policy_type(xp->type, skb) < 0)
goto nlmsg_failure;
if (xfrm_mark_put(skb, &xp->mark))
goto nla_put_failure;
upe->hard = !!hard;
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
@ -2575,6 +2589,7 @@ static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *
headlen = sizeof(*id);
}
len += userpolicy_type_attrsize();
len += nla_total_size(sizeof(struct xfrm_mark));
len += NLMSG_ALIGN(headlen);
skb = nlmsg_new(len, GFP_ATOMIC);
@ -2610,10 +2625,14 @@ static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *
if (copy_to_user_policy_type(xp->type, skb) < 0)
goto nlmsg_failure;
if (xfrm_mark_put(skb, &xp->mark))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
nla_put_failure:
nlmsg_failure:
kfree_skb(skb);
return -1;