[PATCH ipsec-next v2 05/17] xfrm: netlink: add config (netlink) options

[Christian Hopps <chopps@chopps.org>]

From: Christian Hopps <chopps@labn.net>

Add netlink options for configuring IP-TFS SAs.

Signed-off-by: Christian Hopps <chopps@labn.net>
---
 include/uapi/linux/xfrm.h |  9 ++++++-
 net/xfrm/xfrm_compat.c    | 10 ++++++--
 net/xfrm/xfrm_user.c      | 52 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h
index 18ceaba8486e..3bd1f810e079 100644
--- a/include/uapi/linux/xfrm.h
+++ b/include/uapi/linux/xfrm.h
@@ -158,7 +158,8 @@ enum {
 #define XFRM_MODE_ROUTEOPTIMIZATION 2
 #define XFRM_MODE_IN_TRIGGER 3
 #define XFRM_MODE_BEET 4
-#define XFRM_MODE_MAX 5
+#define XFRM_MODE_IPTFS 5
+#define XFRM_MODE_MAX 6
 
 /* Netlink configuration messages.  */
 enum {
@@ -321,6 +322,12 @@ enum xfrm_attr_type_t {
 	XFRMA_IF_ID,		/* __u32 */
 	XFRMA_MTIMER_THRESH,	/* __u32 in seconds for input SA */
 	XFRMA_SA_DIR,		/* __u8 */
+	XFRMA_IPTFS_DROP_TIME,	/* __u32 in: usec to wait for next seq */
+	XFRMA_IPTFS_REORDER_WINDOW, /* __u16 in: reorder window size */
+	XFRMA_IPTFS_DONT_FRAG,	/* out: don't use fragmentation */
+	XFRMA_IPTFS_INIT_DELAY,	/* __u32 out: initial packet wait delay (usec) */
+	XFRMA_IPTFS_MAX_QSIZE,	/* __u32 out: max ingress queue size */
+	XFRMA_IPTFS_PKT_SIZE,	/* __u32 out: size of outer packet, 0 for PMTU */
 	__XFRMA_MAX
 
 #define XFRMA_OUTPUT_MARK XFRMA_SET_MARK	/* Compatibility */
diff --git a/net/xfrm/xfrm_compat.c b/net/xfrm/xfrm_compat.c
index 703d4172c7d7..a28b9f6503e5 100644
--- a/net/xfrm/xfrm_compat.c
+++ b/net/xfrm/xfrm_compat.c
@@ -280,9 +280,15 @@ static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src)
 	case XFRMA_IF_ID:
 	case XFRMA_MTIMER_THRESH:
 	case XFRMA_SA_DIR:
+	case XFRMA_IPTFS_PKT_SIZE:
+	case XFRMA_IPTFS_MAX_QSIZE:
+	case XFRMA_IPTFS_DONT_FRAG:
+	case XFRMA_IPTFS_DROP_TIME:
+	case XFRMA_IPTFS_REORDER_WINDOW:
+	case XFRMA_IPTFS_INIT_DELAY:
 		return xfrm_nla_cpy(dst, src, nla_len(src));
 	default:
-		BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_DIR);
+		BUILD_BUG_ON(XFRMA_MAX != XFRMA_IPTFS_INIT_DELAY);
 		pr_warn_once("unsupported nla_type %d\n", src->nla_type);
 		return -EOPNOTSUPP;
 	}
@@ -437,7 +443,7 @@ static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla,
 	int err;
 
 	if (type > XFRMA_MAX) {
-		BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_DIR);
+		BUILD_BUG_ON(XFRMA_MAX != XFRMA_IPTFS_INIT_DELAY);
 		NL_SET_ERR_MSG(extack, "Bad attribute");
 		return -EOPNOTSUPP;
 	}
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index e83c687bd64e..6537bd520363 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -297,6 +297,16 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
 			NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
 			goto out;
 		}
+		if ((attrs[XFRMA_IPTFS_DROP_TIME] ||
+		     attrs[XFRMA_IPTFS_REORDER_WINDOW] ||
+		     attrs[XFRMA_IPTFS_DONT_FRAG] ||
+		     attrs[XFRMA_IPTFS_INIT_DELAY] ||
+		     attrs[XFRMA_IPTFS_MAX_QSIZE] ||
+		     attrs[XFRMA_IPTFS_PKT_SIZE]) &&
+		    p->mode != XFRM_MODE_IPTFS) {
+			NL_SET_ERR_MSG(extack, "IP-TFS options can only be used in IP-TFS mode");
+			goto out;
+		}
 		break;
 
 	case IPPROTO_COMP:
@@ -417,6 +427,18 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
 			goto out;
 		}
 
+		if (attrs[XFRMA_IPTFS_DROP_TIME]) {
+			NL_SET_ERR_MSG(extack, "Drop time should not be set for output SA");
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (attrs[XFRMA_IPTFS_REORDER_WINDOW]) {
+			NL_SET_ERR_MSG(extack, "Reorder window should not be set for output SA");
+			err = -EINVAL;
+			goto out;
+		}
+
 		if (attrs[XFRMA_REPLAY_VAL]) {
 			struct xfrm_replay_state *replay;
 
@@ -454,6 +476,30 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
 			}
 
 		}
+
+		if (attrs[XFRMA_IPTFS_DONT_FRAG]) {
+			NL_SET_ERR_MSG(extack, "Don't fragment should not be set for input SA");
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (attrs[XFRMA_IPTFS_INIT_DELAY]) {
+			NL_SET_ERR_MSG(extack, "Initial delay should not be set for input SA");
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (attrs[XFRMA_IPTFS_MAX_QSIZE]) {
+			NL_SET_ERR_MSG(extack, "Max queue size should not be set for input SA");
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (attrs[XFRMA_IPTFS_PKT_SIZE]) {
+			NL_SET_ERR_MSG(extack, "Packet size should not be set for input SA");
+			err = -EINVAL;
+			goto out;
+		}
 	}
 
 out:
@@ -3165,6 +3211,12 @@ const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
 	[XFRMA_IF_ID]		= { .type = NLA_U32 },
 	[XFRMA_MTIMER_THRESH]   = { .type = NLA_U32 },
 	[XFRMA_SA_DIR]          = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
+	[XFRMA_IPTFS_DROP_TIME]		= { .type = NLA_U32 },
+	[XFRMA_IPTFS_REORDER_WINDOW]	= { .type = NLA_U16 },
+	[XFRMA_IPTFS_DONT_FRAG]		= { .type = NLA_FLAG },
+	[XFRMA_IPTFS_INIT_DELAY]	= { .type = NLA_U32 },
+	[XFRMA_IPTFS_MAX_QSIZE]		= { .type = NLA_U32 },
+	[XFRMA_IPTFS_PKT_SIZE]	= { .type = NLA_U32 },
 };
 EXPORT_SYMBOL_GPL(xfrma_policy);
 
-- 
2.45.1