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Date: Thu, 24 Jan 2013 13:25:46 +0200
From: Jussi Kivilinna <jussi.kivilinna@...et.fi>
To: Steffen Klassert <steffen.klassert@...unet.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
Tom St Denis <tstdenis@...iptictech.com>,
David Miller <davem@...emloft.net>
Subject: Re: [PATCH] CMAC support for CryptoAPI, fixed patch issues, indent,
and testmgr build issues
Quoting Steffen Klassert <steffen.klassert@...unet.com>:
> On Wed, Jan 23, 2013 at 05:35:10PM +0200, Jussi Kivilinna wrote:
>>
>> Problem seems to be that PFKEYv2 does not quite work with IKEv2, and
>> XFRM API should be used instead. There is new numbers assigned for
>> IKEv2:
>> https://www.iana.org/assignments/ikev2-parameters/ikev2-parameters.xml#ikev2-parameters-7
>>
>> For new SADB_X_AALG_*, I'd think you should use value from "Reserved
>> for private use" range. Maybe 250?
>
> This would be an option, but we have just a few slots for private
> algorithms.
>
>>
>> But maybe better solution might be to not make AES-CMAC (or other
>> new algorithms) available throught PFKEY API at all, just XFRM?
>>
>
> It is probably the best to make new algorithms unavailable for pfkey
> as long as they have no official ikev1 iana transform identifier.
>
> But how to do that? Perhaps we can assign SADB_X_AALG_NOPFKEY to
> the private value 255 and return -EINVAL if pfkey tries to register
> such an algorithm. The netlink interface does not use these
> identifiers, everything should work as expected. So it should be
> possible to use these algoritms with iproute2 and the most modern
> ike deamons.
Maybe it would be cleaner to not mess with pfkeyv2.h at all, but instead mark algorithms that do not support pfkey with flag. See patch below.
Then I started looking up if sadb_alg_id is being used somewhere outside pfkey. Seems that its value is just being copied around.. but at "http://lxr.linux.no/linux+v3.7/net/xfrm/xfrm_policy.c#L1991" it's used as bit-index. So do larger values than 31 break some stuff? Can multiple algorithms have same sadb_alg_id value? Also in af_key.c, sadb_alg_id being used as bit-index.
-Jussi
---
ONLY COMPILE TESTED!
---
include/net/xfrm.h | 5 +++--
net/key/af_key.c | 39 +++++++++++++++++++++++++++++++--------
net/xfrm/xfrm_algo.c | 12 ++++++------
3 files changed, 40 insertions(+), 16 deletions(-)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 421f764..5d5eec2 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1320,6 +1320,7 @@ struct xfrm_algo_desc {
char *name;
char *compat;
u8 available:1;
+ u8 sadb_disabled:1;
union {
struct xfrm_algo_aead_info aead;
struct xfrm_algo_auth_info auth;
@@ -1561,8 +1562,8 @@ extern void xfrm_input_init(void);
extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
extern void xfrm_probe_algs(void);
-extern int xfrm_count_auth_supported(void);
-extern int xfrm_count_enc_supported(void);
+extern int xfrm_count_sadb_auth_supported(void);
+extern int xfrm_count_sadb_enc_supported(void);
extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 5b426a6..307cf1d 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -816,18 +816,21 @@ static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
sa->sadb_sa_auth = 0;
if (x->aalg) {
struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
- sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
+ sa->sadb_sa_auth = (a && !a->sadb_disabled) ?
+ a->desc.sadb_alg_id : 0;
}
sa->sadb_sa_encrypt = 0;
BUG_ON(x->ealg && x->calg);
if (x->ealg) {
struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
- sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
+ sa->sadb_sa_encrypt = (a && !a->sadb_disabled) ?
+ a->desc.sadb_alg_id : 0;
}
/* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
if (x->calg) {
struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
- sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
+ sa->sadb_sa_encrypt = (a && !a->sadb_disabled) ?
+ a->desc.sadb_alg_id : 0;
}
sa->sadb_sa_flags = 0;
@@ -1138,7 +1141,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
if (sa->sadb_sa_auth) {
int keysize = 0;
struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
- if (!a) {
+ if (!a || a->sadb_disabled) {
err = -ENOSYS;
goto out;
}
@@ -1160,7 +1163,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
if (sa->sadb_sa_encrypt) {
if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
- if (!a) {
+ if (!a || a->sadb_disabled) {
err = -ENOSYS;
goto out;
}
@@ -1172,7 +1175,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
} else {
int keysize = 0;
struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
- if (!a) {
+ if (!a || a->sadb_disabled) {
err = -ENOSYS;
goto out;
}
@@ -1578,13 +1581,13 @@ static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
struct sadb_msg *hdr;
int len, auth_len, enc_len, i;
- auth_len = xfrm_count_auth_supported();
+ auth_len = xfrm_count_sadb_auth_supported();
if (auth_len) {
auth_len *= sizeof(struct sadb_alg);
auth_len += sizeof(struct sadb_supported);
}
- enc_len = xfrm_count_enc_supported();
+ enc_len = xfrm_count_sadb_enc_supported();
if (enc_len) {
enc_len *= sizeof(struct sadb_alg);
enc_len += sizeof(struct sadb_supported);
@@ -1615,6 +1618,8 @@ static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
if (!aalg)
break;
+ if (aalg->sadb_disabled)
+ continue;
if (aalg->available)
*ap++ = aalg->desc;
}
@@ -1634,6 +1639,8 @@ static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
if (!ealg)
break;
+ if (ealg->sadb_disabled)
+ continue;
if (ealg->available)
*ap++ = ealg->desc;
}
@@ -2825,6 +2832,8 @@ static int count_ah_combs(const struct xfrm_tmpl *t)
const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
if (!aalg)
break;
+ if (aalg->sadb_disabled)
+ continue;
if (aalg_tmpl_set(t, aalg) && aalg->available)
sz += sizeof(struct sadb_comb);
}
@@ -2840,6 +2849,9 @@ static int count_esp_combs(const struct xfrm_tmpl *t)
if (!ealg)
break;
+ if (ealg->sadb_disabled)
+ continue;
+
if (!(ealg_tmpl_set(t, ealg) && ealg->available))
continue;
@@ -2848,6 +2860,9 @@ static int count_esp_combs(const struct xfrm_tmpl *t)
if (!aalg)
break;
+ if (aalg->sadb_disabled)
+ continue;
+
if (aalg_tmpl_set(t, aalg) && aalg->available)
sz += sizeof(struct sadb_comb);
}
@@ -2871,6 +2886,9 @@ static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
if (!aalg)
break;
+ if (aalg->sadb_disabled)
+ continue;
+
if (aalg_tmpl_set(t, aalg) && aalg->available) {
struct sadb_comb *c;
c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
@@ -2903,6 +2921,9 @@ static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
if (!ealg)
break;
+ if (ealg->sadb_disabled)
+ continue;
+
if (!(ealg_tmpl_set(t, ealg) && ealg->available))
continue;
@@ -2911,6 +2932,8 @@ static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
if (!aalg)
break;
+ if (aalg->sadb_disabled)
+ continue;
if (!(aalg_tmpl_set(t, aalg) && aalg->available))
continue;
c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index 4694cca..dab881c 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c
@@ -713,27 +713,27 @@ void xfrm_probe_algs(void)
}
EXPORT_SYMBOL_GPL(xfrm_probe_algs);
-int xfrm_count_auth_supported(void)
+int xfrm_count_sadb_auth_supported(void)
{
int i, n;
for (i = 0, n = 0; i < aalg_entries(); i++)
- if (aalg_list[i].available)
+ if (aalg_list[i].available && !aalg_list[i].sadb_disabled)
n++;
return n;
}
-EXPORT_SYMBOL_GPL(xfrm_count_auth_supported);
+EXPORT_SYMBOL_GPL(xfrm_count_sadb_auth_supported);
-int xfrm_count_enc_supported(void)
+int xfrm_count_sadb_enc_supported(void)
{
int i, n;
for (i = 0, n = 0; i < ealg_entries(); i++)
- if (ealg_list[i].available)
+ if (ealg_list[i].available && !ealg_list[i].sadb_disabled)
n++;
return n;
}
-EXPORT_SYMBOL_GPL(xfrm_count_enc_supported);
+EXPORT_SYMBOL_GPL(xfrm_count_sadb_enc_supported);
#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
--
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