Merge branch 'xfrm: add extack support to some more message types'

Sabrina Dubroca says: ============ This is the last part of my extack work for xfrm, adding extack messages to the last remaining operations: NEWSPDINFO, ALLOCSPI, MIGRATE, NEWAE, DELSA, EXPIRE. The first patch does a few clean ups on code that will be changed later on it the series. ============ Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
mariux64 · Nov 26, 2022 · b198d7b · b198d7b
2 parents cc2bbbf + a741721
commit b198d7b
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Showing 5 changed files with 109 additions and 43 deletions.
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
@@ -1681,8 +1681,9 @@ struct xfrm_policy *xfrm_policy_byid(struct net *net,
 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
 void xfrm_policy_hash_rebuild(struct net *net);
 u32 xfrm_get_acqseq(void);
-int verify_spi_info(u8 proto, u32 min, u32 max);
-int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
+int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack);
+int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi,
+		   struct netlink_ext_ack *extack);
 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
 				 u8 mode, u32 reqid, u32 if_id, u8 proto,
 				 const xfrm_address_t *daddr,
@@ -1703,7 +1704,8 @@ struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
 		 struct xfrm_migrate *m, int num_bundles,
 		 struct xfrm_kmaddress *k, struct net *net,
-		 struct xfrm_encap_tmpl *encap, u32 if_id);
+		 struct xfrm_encap_tmpl *encap, u32 if_id,
+		 struct netlink_ext_ack *extack);
 #endif
 
 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);

diff --git a/net/key/af_key.c b/net/key/af_key.c
@@ -1377,13 +1377,13 @@ static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_
 		max_spi = range->sadb_spirange_max;
 	}
 
-	err = verify_spi_info(x->id.proto, min_spi, max_spi);
+	err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL);
 	if (err) {
 		xfrm_state_put(x);
 		return err;
 	}
 
-	err = xfrm_alloc_spi(x, min_spi, max_spi);
+	err = xfrm_alloc_spi(x, min_spi, max_spi, NULL);
 	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
 
 	if (IS_ERR(resp_skb)) {
@@ -2626,7 +2626,7 @@ static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
 	}
 
 	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
-			    kma ? &k : NULL, net, NULL, 0);
+			    kma ? &k : NULL, net, NULL, 0, NULL);
 
  out:
 	return err;

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
@@ -4333,14 +4333,16 @@ static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tm
 
 /* update endpoint address(es) of template(s) */
 static int xfrm_policy_migrate(struct xfrm_policy *pol,
-			       struct xfrm_migrate *m, int num_migrate)
+			       struct xfrm_migrate *m, int num_migrate,
+			       struct netlink_ext_ack *extack)
 {
 	struct xfrm_migrate *mp;
 	int i, j, n = 0;
 
 	write_lock_bh(&pol->lock);
 	if (unlikely(pol->walk.dead)) {
 		/* target policy has been deleted */
+		NL_SET_ERR_MSG(extack, "Target policy not found");
 		write_unlock_bh(&pol->lock);
 		return -ENOENT;
 	}
@@ -4372,17 +4374,22 @@ static int xfrm_policy_migrate(struct xfrm_policy *pol,
 	return 0;
 }
 
-static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
+static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate,
+			      struct netlink_ext_ack *extack)
 {
 	int i, j;
 
-	if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
+	if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) {
+		NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
 		return -EINVAL;
+	}
 
 	for (i = 0; i < num_migrate; i++) {
 		if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
-		    xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
+		    xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) {
+			NL_SET_ERR_MSG(extack, "Addresses in the MIGRATE attribute's list cannot be null");
 			return -EINVAL;
+		}
 
 		/* check if there is any duplicated entry */
 		for (j = i + 1; j < num_migrate; j++) {
@@ -4393,8 +4400,10 @@ static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
 			    m[i].proto == m[j].proto &&
 			    m[i].mode == m[j].mode &&
 			    m[i].reqid == m[j].reqid &&
-			    m[i].old_family == m[j].old_family)
+			    m[i].old_family == m[j].old_family) {
+				NL_SET_ERR_MSG(extack, "Entries in the MIGRATE attribute's list must be unique");
 				return -EINVAL;
+			}
 		}
 	}
 
@@ -4404,7 +4413,8 @@ static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
 		 struct xfrm_migrate *m, int num_migrate,
 		 struct xfrm_kmaddress *k, struct net *net,
-		 struct xfrm_encap_tmpl *encap, u32 if_id)
+		 struct xfrm_encap_tmpl *encap, u32 if_id,
+		 struct netlink_ext_ack *extack)
 {
 	int i, err, nx_cur = 0, nx_new = 0;
 	struct xfrm_policy *pol = NULL;
@@ -4414,16 +4424,20 @@ int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
 	struct xfrm_migrate *mp;
 
 	/* Stage 0 - sanity checks */
-	if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
+	err = xfrm_migrate_check(m, num_migrate, extack);
+	if (err < 0)
 		goto out;
 
 	if (dir >= XFRM_POLICY_MAX) {
+		NL_SET_ERR_MSG(extack, "Invalid policy direction");
 		err = -EINVAL;
 		goto out;
 	}
 
 	/* Stage 1 - find policy */
-	if ((pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id)) == NULL) {
+	pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id);
+	if (!pol) {
+		NL_SET_ERR_MSG(extack, "Target policy not found");
 		err = -ENOENT;
 		goto out;
 	}
@@ -4445,7 +4459,8 @@ int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
 	}
 
 	/* Stage 3 - update policy */
-	if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
+	err = xfrm_policy_migrate(pol, m, num_migrate, extack);
+	if (err < 0)
 		goto restore_state;
 
 	/* Stage 4 - delete old state(s) */

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
@@ -2017,7 +2017,7 @@ u32 xfrm_get_acqseq(void)
 }
 EXPORT_SYMBOL(xfrm_get_acqseq);
 
-int verify_spi_info(u8 proto, u32 min, u32 max)
+int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack)
 {
 	switch (proto) {
 	case IPPROTO_AH:
@@ -2026,22 +2026,28 @@ int verify_spi_info(u8 proto, u32 min, u32 max)
 
 	case IPPROTO_COMP:
 		/* IPCOMP spi is 16-bits. */
-		if (max >= 0x10000)
+		if (max >= 0x10000) {
+			NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535");
 			return -EINVAL;
+		}
 		break;
 
 	default:
+		NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP");
 		return -EINVAL;
 	}
 
-	if (min > max)
+	if (min > max) {
+		NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max");
 		return -EINVAL;
+	}
 
 	return 0;
 }
 EXPORT_SYMBOL(verify_spi_info);
 
-int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
+int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high,
+		   struct netlink_ext_ack *extack)
 {
 	struct net *net = xs_net(x);
 	unsigned int h;
@@ -2053,8 +2059,10 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
 	u32 mark = x->mark.v & x->mark.m;
 
 	spin_lock_bh(&x->lock);
-	if (x->km.state == XFRM_STATE_DEAD)
+	if (x->km.state == XFRM_STATE_DEAD) {
+		NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state");
 		goto unlock;
+	}
 
 	err = 0;
 	if (x->id.spi)
@@ -2065,6 +2073,7 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
 	if (minspi == maxspi) {
 		x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
 		if (x0) {
+			NL_SET_ERR_MSG(extack, "Requested SPI is already in use");
 			xfrm_state_put(x0);
 			goto unlock;
 		}
@@ -2089,6 +2098,8 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
 		spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 
 		err = 0;
+	} else {
+		NL_SET_ERR_MSG(extack, "No SPI available in the requested range");
 	}
 
 unlock: