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Message-Id: <20230724075051.20081-1-liuhangbin@gmail.com>
Date: Mon, 24 Jul 2023 15:50:51 +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>,
Ido Schimmel <idosch@...sch.org>,
Hangbin Liu <liuhangbin@...il.com>,
Beniamino Galvani <bgalvani@...hat.com>
Subject: [PATCHv3 net-next] IPv6: add extack info for IPv6 address add/delete
Add extack info for IPv6 address add/delete, 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>
---
v3: * Update extack message. Pass extack to addrconf_f6i_alloc().
* Return "IPv6 is disabled" for addrconf_add_dev(), as the same
with ndisc_allow_add() does.
* Set dup addr extack message in inet6_rtm_newaddr() instead of
ipv6_add_addr_hash().
v2: Update extack msg for dead dev. Remove msg for NOBUFS error.
Add extack for ipv6_add_addr_hash()
---
include/net/ip6_route.h | 2 +-
net/ipv6/addrconf.c | 63 +++++++++++++++++++++++++++++------------
net/ipv6/anycast.c | 2 +-
net/ipv6/route.c | 5 ++--
4 files changed, 50 insertions(+), 22 deletions(-)
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 3556595ce59a..b32539bb0fb0 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -156,7 +156,7 @@ void fib6_force_start_gc(struct net *net);
struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev,
const struct in6_addr *addr, bool anycast,
- gfp_t gfp_flags);
+ gfp_t gfp_flags, struct netlink_ext_ack *extack);
struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
int flags);
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 19eb4b3d26ea..53dea18a4a07 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1068,15 +1068,19 @@ 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, "IPv6 device is going away");
+ err = -ENODEV;
goto out;
}
if (idev->cnf.disable_ipv6) {
+ NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device");
err = -EACCES;
goto out;
}
@@ -1103,7 +1107,7 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
goto out;
}
- f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
+ f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
if (IS_ERR(f6i)) {
err = PTR_ERR(f6i);
f6i = NULL;
@@ -2921,30 +2925,40 @@ 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, "Invalid prefix length");
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 a prefix length of 64");
return -EINVAL;
+ }
dev = __dev_get_by_index(net, ifindex);
if (!dev)
return -ENODEV;
idev = addrconf_add_dev(dev);
- if (IS_ERR(idev))
+ if (IS_ERR(idev)) {
+ NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device");
return PTR_ERR(idev);
+ }
if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
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);
@@ -3001,22 +3015,29 @@ 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, "Invalid prefix length");
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, "IPv6 is disabled on this device");
return -ENXIO;
+ }
read_lock_bh(&idev->lock);
list_for_each_entry(ifp, &idev->addr_list, if_list) {
@@ -3039,6 +3060,8 @@ 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;
}
@@ -3081,7 +3104,7 @@ 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;
}
@@ -3484,7 +3507,7 @@ static int fixup_permanent_addr(struct net *net,
struct fib6_info *f6i, *prev;
f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
- GFP_ATOMIC);
+ GFP_ATOMIC, NULL);
if (IS_ERR(f6i))
return PTR_ERR(f6i);
@@ -4694,7 +4717,7 @@ 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,
@@ -4899,8 +4922,10 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
}
dev = __dev_get_by_index(net, ifm->ifa_index);
- if (!dev)
+ if (!dev) {
+ NL_SET_ERR_MSG(extack, "Unable to find the interface");
return -ENODEV;
+ }
if (tb[IFA_FLAGS])
cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
@@ -4935,10 +4960,12 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
}
if (nlh->nlmsg_flags & NLM_F_EXCL ||
- !(nlh->nlmsg_flags & NLM_F_REPLACE))
+ !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
+ NL_SET_ERR_MSG(extack, "IPv6 address already assigned");
err = -EEXIST;
- else
+ } else {
err = inet6_addr_modify(net, ifa, &cfg);
+ }
in6_ifa_put(ifa);
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index dacdea7fcb62..bb17f484ee2c 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -305,7 +305,7 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
}
net = dev_net(idev->dev);
- f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC);
+ f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC, NULL);
if (IS_ERR(f6i)) {
err = PTR_ERR(f6i);
goto out;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 64e873f5895f..c90700aed3a1 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4543,7 +4543,8 @@ static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff
struct fib6_info *addrconf_f6i_alloc(struct net *net,
struct inet6_dev *idev,
const struct in6_addr *addr,
- bool anycast, gfp_t gfp_flags)
+ bool anycast, gfp_t gfp_flags,
+ struct netlink_ext_ack *extack)
{
struct fib6_config cfg = {
.fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
@@ -4565,7 +4566,7 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net,
cfg.fc_flags |= RTF_LOCAL;
}
- f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
+ f6i = ip6_route_info_create(&cfg, gfp_flags, extack);
if (!IS_ERR(f6i)) {
f6i->dst_nocount = true;
--
2.38.1
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