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Message-Id: <20230717093316.2428813-1-liuhangbin@gmail.com>
Date: Mon, 17 Jul 2023 17:33:16 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: "David S . Miller" <davem@...emloft.net>,
David Ahern <dsahern@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Hangbin Liu <liuhangbin@...il.com>,
Beniamino Galvani <bgalvani@...hat.com>
Subject: [PATCH net-next] IPv6: add extack info for inet6_addr_add/del
Add extack info for inet6_addr_add(), ipv6_add_addr() and
inet6_addr_del(), which would be useful for users to understand the
problem without having to read kernel code.
Suggested-by: Beniamino Galvani <bgalvani@...hat.com>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
net/ipv6/addrconf.c | 66 ++++++++++++++++++++++++++++++++-------------
1 file changed, 48 insertions(+), 18 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e5213e598a04..199de4b37f24 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1066,15 +1066,19 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
!(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
(!(idev->dev->flags & IFF_LOOPBACK) &&
!netif_is_l3_master(idev->dev) &&
- addr_type & IPV6_ADDR_LOOPBACK))
+ addr_type & IPV6_ADDR_LOOPBACK)) {
+ NL_SET_ERR_MSG(extack, "Cannot assign requested address");
return ERR_PTR(-EADDRNOTAVAIL);
+ }
if (idev->dead) {
- err = -ENODEV; /*XXX*/
+ NL_SET_ERR_MSG(extack, "No such device");
+ err = -ENODEV;
goto out;
}
if (idev->cnf.disable_ipv6) {
+ NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device");
err = -EACCES;
goto out;
}
@@ -1097,12 +1101,14 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
if (!ifa) {
+ NL_SET_ERR_MSG(extack, "No buffer space available");
err = -ENOBUFS;
goto out;
}
f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
if (IS_ERR(f6i)) {
+ NL_SET_ERR_MSG(extack, "Dest allocate failed");
err = PTR_ERR(f6i);
f6i = NULL;
goto out;
@@ -1142,6 +1148,7 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
err = ipv6_add_addr_hash(idev->dev, ifa);
if (err < 0) {
+ NL_SET_ERR_MSG(extack, "IPv6 address add failed");
rcu_read_unlock();
goto out;
}
@@ -2488,18 +2495,22 @@ static void addrconf_add_mroute(struct net_device *dev)
ip6_route_add(&cfg, GFP_KERNEL, NULL);
}
-static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
+static struct inet6_dev *addrconf_add_dev(struct net_device *dev, struct netlink_ext_ack *extack)
{
struct inet6_dev *idev;
ASSERT_RTNL();
idev = ipv6_find_idev(dev);
- if (IS_ERR(idev))
+ if (IS_ERR(idev)) {
+ NL_SET_ERR_MSG(extack, "No such device");
return idev;
+ }
- if (idev->cnf.disable_ipv6)
+ if (idev->cnf.disable_ipv6) {
+ NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device");
return ERR_PTR(-EACCES);
+ }
/* Add default multicast route */
if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
@@ -2919,21 +2930,29 @@ static int inet6_addr_add(struct net *net, int ifindex,
ASSERT_RTNL();
- if (cfg->plen > 128)
+ if (cfg->plen > 128) {
+ NL_SET_ERR_MSG(extack, "IPv6 address prefix length larger than 128");
return -EINVAL;
+ }
/* check the lifetime */
- if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
+ if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
+ NL_SET_ERR_MSG(extack, "IPv6 address lifetime invalid");
return -EINVAL;
+ }
- if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
+ if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
+ NL_SET_ERR_MSG(extack, "IPv6 address with mngtmpaddr flag must have prefix length 64");
return -EINVAL;
+ }
dev = __dev_get_by_index(net, ifindex);
- if (!dev)
+ if (!dev) {
+ NL_SET_ERR_MSG(extack, "Unable to find the interface");
return -ENODEV;
+ }
- idev = addrconf_add_dev(dev);
+ idev = addrconf_add_dev(dev, extack);
if (IS_ERR(idev))
return PTR_ERR(idev);
@@ -2941,8 +2960,10 @@ static int inet6_addr_add(struct net *net, int ifindex,
int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
true, cfg->pfx, ifindex);
- if (ret < 0)
+ if (ret < 0) {
+ NL_SET_ERR_MSG(extack, "Multicast auto join failed");
return ret;
+ }
}
cfg->scope = ipv6_addr_scope(cfg->pfx);
@@ -2999,22 +3020,29 @@ static int inet6_addr_add(struct net *net, int ifindex,
}
static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
- const struct in6_addr *pfx, unsigned int plen)
+ const struct in6_addr *pfx, unsigned int plen,
+ struct netlink_ext_ack *extack)
{
struct inet6_ifaddr *ifp;
struct inet6_dev *idev;
struct net_device *dev;
- if (plen > 128)
+ if (plen > 128) {
+ NL_SET_ERR_MSG(extack, "IPv6 address prefix length larger than 128");
return -EINVAL;
+ }
dev = __dev_get_by_index(net, ifindex);
- if (!dev)
+ if (!dev) {
+ NL_SET_ERR_MSG(extack, "Unable to find the interface");
return -ENODEV;
+ }
idev = __in6_dev_get(dev);
- if (!idev)
+ if (!idev) {
+ NL_SET_ERR_MSG(extack, "No such address on the device");
return -ENXIO;
+ }
read_lock_bh(&idev->lock);
list_for_each_entry(ifp, &idev->addr_list, if_list) {
@@ -3037,6 +3065,8 @@ static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
}
}
read_unlock_bh(&idev->lock);
+
+ NL_SET_ERR_MSG(extack, "IPv6 address not found");
return -EADDRNOTAVAIL;
}
@@ -3079,7 +3109,7 @@ int addrconf_del_ifaddr(struct net *net, void __user *arg)
rtnl_lock();
err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
- ireq.ifr6_prefixlen);
+ ireq.ifr6_prefixlen, NULL);
rtnl_unlock();
return err;
}
@@ -3378,7 +3408,7 @@ static void addrconf_dev_config(struct net_device *dev)
return;
}
- idev = addrconf_add_dev(dev);
+ idev = addrconf_add_dev(dev, NULL);
if (IS_ERR(idev))
return;
@@ -4692,7 +4722,7 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
ifa_flags &= IFA_F_MANAGETEMPADDR;
return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
- ifm->ifa_prefixlen);
+ ifm->ifa_prefixlen, extack);
}
static int modify_prefix_route(struct inet6_ifaddr *ifp,
--
2.38.1
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