2020-09-10 10:03:38

by Era Mayflower

Subject: [PATCH v2] macsec: Support 32bit PN netlink attribute for XPN links

Allow using 32bit netlink attribute for packet number when creating or
updating SA in an XPN link.
Now utilities like iproute2's `ip` do not have to know the link type
(XPN or not) when setting the packet number field of an SA.

Signed-off-by: Era Mayflower <[email protected]>
---
drivers/net/macsec.c | 95 ++++++++++++++++++++++++++++++++------------
1 file changed, 69 insertions(+), 26 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index e56547bfdac9..7d3c3a38ea81 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1691,8 +1691,7 @@ static bool validate_add_rxsa(struct nlattr **attrs)
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;

- if (attrs[MACSEC_SA_ATTR_PN] &&
- *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0)
+ if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;

if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
@@ -1714,7 +1713,6 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
unsigned char assoc_num;
- int pn_len;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
int err;
@@ -1747,12 +1745,26 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
return -EINVAL;
}

- pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
- if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
- pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
- nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
- rtnl_unlock();
- return -EINVAL;
+ if (tb_sa[MACSEC_SA_ATTR_PN]) {
+ switch (nla_len(tb_sa[MACSEC_SA_ATTR_PN])) {
+ case MACSEC_DEFAULT_PN_LEN:
+ break;
+
+ case MACSEC_XPN_PN_LEN:
+ if (secy->xpn)
+ break;
+
+ pr_notice("macsec: nl: add_rxsa: pn length on non-xpn links must be %d\n",
+ MACSEC_DEFAULT_PN_LEN);
+ rtnl_unlock();
+ return -EINVAL;
+
+ default:
+ pr_notice("macsec: nl: add_rxsa: pn length must be %d or %d\n",
+ MACSEC_DEFAULT_PN_LEN, MACSEC_XPN_PN_LEN);
+ rtnl_unlock();
+ return -EINVAL;
+ }
}

if (secy->xpn) {
@@ -1934,7 +1946,7 @@ static bool validate_add_txsa(struct nlattr **attrs)
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;

- if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
+ if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;

if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
@@ -1956,7 +1968,6 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
unsigned char assoc_num;
- int pn_len;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
bool was_operational;
int err;
@@ -1989,10 +2000,22 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
return -EINVAL;
}

- pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
- if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
- pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
- nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
+ switch (nla_len(tb_sa[MACSEC_SA_ATTR_PN])) {
+ case MACSEC_DEFAULT_PN_LEN:
+ break;
+
+ case MACSEC_XPN_PN_LEN:
+ if (secy->xpn)
+ break;
+
+ pr_notice("macsec: nl: add_txsa: pn length on non-xpn links must be %d\n",
+ MACSEC_DEFAULT_PN_LEN);
+ rtnl_unlock();
+ return -EINVAL;
+
+ default:
+ pr_notice("macsec: nl: add_txsa: pn length must be %d or %d\n",
+ MACSEC_DEFAULT_PN_LEN, MACSEC_XPN_PN_LEN);
rtnl_unlock();
return -EINVAL;
}
@@ -2288,7 +2311,7 @@ static bool validate_upd_sa(struct nlattr **attrs)
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;

- if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
+ if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;

if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
@@ -2332,12 +2355,22 @@ static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
}

if (tb_sa[MACSEC_SA_ATTR_PN]) {
- int pn_len;
+ switch (nla_len(tb_sa[MACSEC_SA_ATTR_PN])) {
+ case MACSEC_DEFAULT_PN_LEN:
+ break;
+
+ case MACSEC_XPN_PN_LEN:
+ if (secy->xpn)
+ break;
+
+ pr_notice("macsec: nl: upd_txsa: pn length on non-xpn links must be %d\n",
+ MACSEC_DEFAULT_PN_LEN);
+ rtnl_unlock();
+ return -EINVAL;

- pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
- if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
- pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
- nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
+ default:
+ pr_notice("macsec: nl: upd_txsa: pn length must be %d or %d\n",
+ MACSEC_DEFAULT_PN_LEN, MACSEC_XPN_PN_LEN);
rtnl_unlock();
return -EINVAL;
}
@@ -2429,12 +2462,22 @@ static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
}

if (tb_sa[MACSEC_SA_ATTR_PN]) {
- int pn_len;
+ switch (nla_len(tb_sa[MACSEC_SA_ATTR_PN])) {
+ case MACSEC_DEFAULT_PN_LEN:
+ break;
+
+ case MACSEC_XPN_PN_LEN:
+ if (secy->xpn)
+ break;

- pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
- if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
- pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
- nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
+ pr_notice("macsec: nl: upd_rxsa: pn length on non-xpn links must be %d\n",
+ MACSEC_DEFAULT_PN_LEN);
+ rtnl_unlock();
+ return -EINVAL;
+
+ default:
+ pr_notice("macsec: nl: upd_rxsa: pn length must be %d or %d\n",
+ MACSEC_DEFAULT_PN_LEN, MACSEC_XPN_PN_LEN);
rtnl_unlock();
return -EINVAL;
}

base-commit: bc7d17d55762421b98089f5f7496e48cab89de50
--
2.20.1

2020-09-10 22:06:45

by David Miller

Subject: Re: [PATCH v2] macsec: Support 32bit PN netlink attribute for XPN links

From: Era Mayflower <[email protected]>
Date: Thu, 10 Sep 2020 09:56:09 +0000

> - pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
> - if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
> - pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
> - nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
> + pr_notice("macsec: nl: upd_rxsa: pn length on non-xpn links must be %d\n",
> + MACSEC_DEFAULT_PN_LEN);
> + rtnl_unlock();
> + return -EINVAL;
> +
> + default:
> + pr_notice("macsec: nl: upd_rxsa: pn length must be %d or %d\n",
> + MACSEC_DEFAULT_PN_LEN, MACSEC_XPN_PN_LEN);
> rtnl_unlock();

Please do not spam the kernel log like this. Instead, report this
info via netlink extended ACKs.

Thank you.