[XFRM] netlink: Use nlmsg_new() and type-safe size calculation helpers
Moves all complex message size calculation into own inlined helper
functions and makes use of the type-safe netlink interface.
Using nlmsg_new() simplifies the calculation itself as it takes care
of the netlink header length by itself.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 5efaf45..7833329 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -670,7 +670,7 @@
struct xfrm_dump_info info;
struct sk_buff *skb;
- skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
@@ -688,6 +688,13 @@
return skb;
}
+static inline size_t xfrm_spdinfo_msgsize(void)
+{
+ return NLMSG_ALIGN(4)
+ + nla_total_size(sizeof(struct xfrmu_spdinfo))
+ + nla_total_size(sizeof(struct xfrmu_spdhinfo));
+}
+
static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
{
struct xfrmk_spdinfo si;
@@ -729,12 +736,8 @@
u32 *flags = nlmsg_data(nlh);
u32 spid = NETLINK_CB(skb).pid;
u32 seq = nlh->nlmsg_seq;
- int len = NLMSG_LENGTH(sizeof(u32));
- len += RTA_SPACE(sizeof(struct xfrmu_spdinfo));
- len += RTA_SPACE(sizeof(struct xfrmu_spdhinfo));
-
- r_skb = alloc_skb(len, GFP_ATOMIC);
+ r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
if (r_skb == NULL)
return -ENOMEM;
@@ -744,6 +747,13 @@
return nlmsg_unicast(xfrm_nl, r_skb, spid);
}
+static inline size_t xfrm_sadinfo_msgsize(void)
+{
+ return NLMSG_ALIGN(4)
+ + nla_total_size(sizeof(struct xfrmu_sadhinfo))
+ + nla_total_size(4); /* XFRMA_SAD_CNT */
+}
+
static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
{
struct xfrmk_sadinfo si;
@@ -779,13 +789,8 @@
u32 *flags = nlmsg_data(nlh);
u32 spid = NETLINK_CB(skb).pid;
u32 seq = nlh->nlmsg_seq;
- int len = NLMSG_LENGTH(sizeof(u32));
- len += RTA_SPACE(sizeof(struct xfrmu_sadhinfo));
- len += RTA_SPACE(sizeof(u32));
-
- r_skb = alloc_skb(len, GFP_ATOMIC);
-
+ r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
if (r_skb == NULL)
return -ENOMEM;
@@ -1311,7 +1316,7 @@
struct xfrm_dump_info info;
struct sk_buff *skb;
- skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
@@ -1425,6 +1430,14 @@
return 0;
}
+static inline size_t xfrm_aevent_msgsize(void)
+{
+ return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
+ + nla_total_size(sizeof(struct xfrm_replay_state))
+ + nla_total_size(sizeof(struct xfrm_lifetime_cur))
+ + nla_total_size(4) /* XFRM_AE_RTHR */
+ + nla_total_size(4); /* XFRM_AE_ETHR */
+}
static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
{
@@ -1469,19 +1482,9 @@
int err;
struct km_event c;
struct xfrm_aevent_id *p = nlmsg_data(nlh);
- int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
struct xfrm_usersa_id *id = &p->sa_id;
- len += RTA_SPACE(sizeof(struct xfrm_replay_state));
- len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
-
- if (p->flags&XFRM_AE_RTHR)
- len+=RTA_SPACE(sizeof(u32));
-
- if (p->flags&XFRM_AE_ETHR)
- len+=RTA_SPACE(sizeof(u32));
-
- r_skb = alloc_skb(len, GFP_ATOMIC);
+ r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
if (r_skb == NULL)
return -ENOMEM;
@@ -1824,6 +1827,13 @@
return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
}
+static inline size_t xfrm_migrate_msgsize(int num_migrate)
+{
+ return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
+ + 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)
@@ -1861,12 +1871,8 @@
struct xfrm_migrate *m, int num_migrate)
{
struct sk_buff *skb;
- size_t len;
- len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
- len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
- len += userpolicy_type_attrsize();
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2002,6 +2008,11 @@
} while (qlen);
}
+static inline size_t xfrm_expire_msgsize(void)
+{
+ return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
+}
+
static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
{
struct xfrm_user_expire *ue;
@@ -2021,9 +2032,8 @@
static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
{
struct sk_buff *skb;
- int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2036,11 +2046,8 @@
static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
{
struct sk_buff *skb;
- int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
- len += RTA_SPACE(sizeof(struct xfrm_replay_state));
- len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2055,9 +2062,9 @@
struct xfrm_usersa_flush *p;
struct nlmsghdr *nlh;
struct sk_buff *skb;
- int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
+ int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2075,17 +2082,17 @@
return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
}
-static inline int xfrm_sa_len(struct xfrm_state *x)
+static inline size_t xfrm_sa_len(struct xfrm_state *x)
{
- int l = 0;
+ size_t l = 0;
if (x->aalg)
- l += RTA_SPACE(alg_len(x->aalg));
+ l += nla_total_size(alg_len(x->aalg));
if (x->ealg)
- l += RTA_SPACE(alg_len(x->ealg));
+ l += nla_total_size(alg_len(x->ealg));
if (x->calg)
- l += RTA_SPACE(sizeof(*x->calg));
+ l += nla_total_size(sizeof(*x->calg));
if (x->encap)
- l += RTA_SPACE(sizeof(*x->encap));
+ l += nla_total_size(sizeof(*x->encap));
return l;
}
@@ -2101,12 +2108,12 @@
headlen = sizeof(*p);
if (c->event == XFRM_MSG_DELSA) {
- len += RTA_SPACE(headlen);
+ len += nla_total_size(headlen);
headlen = sizeof(*id);
}
- len += NLMSG_SPACE(headlen);
+ len += NLMSG_ALIGN(headlen);
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2175,6 +2182,15 @@
}
+static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
+ struct xfrm_policy *xp)
+{
+ return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
+ + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
+ + nla_total_size(xfrm_user_sec_ctx_size(x->security))
+ + userpolicy_type_attrsize();
+}
+
static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
struct xfrm_tmpl *xt, struct xfrm_policy *xp,
int dir)
@@ -2215,13 +2231,8 @@
struct xfrm_policy *xp, int dir)
{
struct sk_buff *skb;
- size_t len;
- len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
- len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
- len += RTA_SPACE(xfrm_user_sec_ctx_size(x->security));
- len += userpolicy_type_attrsize();
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2290,6 +2301,14 @@
return xp;
}
+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))
+ + userpolicy_type_attrsize();
+}
+
static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
int dir, struct km_event *c)
{
@@ -2321,13 +2340,8 @@
static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
{
struct sk_buff *skb;
- size_t len;
- len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
- len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
- len += RTA_SPACE(xfrm_user_sec_ctx_size(xp->security));
- len += userpolicy_type_attrsize();
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2343,18 +2357,18 @@
struct xfrm_userpolicy_id *id;
struct nlmsghdr *nlh;
struct sk_buff *skb;
- int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
+ int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
int headlen;
headlen = sizeof(*p);
if (c->event == XFRM_MSG_DELPOLICY) {
- len += RTA_SPACE(headlen);
+ len += nla_total_size(headlen);
headlen = sizeof(*id);
}
len += userpolicy_type_attrsize();
- len += NLMSG_SPACE(headlen);
+ len += NLMSG_ALIGN(headlen);
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2400,11 +2414,8 @@
{
struct nlmsghdr *nlh;
struct sk_buff *skb;
- int len = 0;
- len += userpolicy_type_attrsize();
- len += NLMSG_LENGTH(0);
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
@@ -2443,6 +2454,11 @@
}
+static inline size_t xfrm_report_msgsize(void)
+{
+ return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
+}
+
static int build_report(struct sk_buff *skb, u8 proto,
struct xfrm_selector *sel, xfrm_address_t *addr)
{
@@ -2471,10 +2487,8 @@
xfrm_address_t *addr)
{
struct sk_buff *skb;
- size_t len;
- len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;