diff options
author | Eric Dumazet <edumazet@google.com> | 2024-02-28 16:54:39 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2024-03-01 11:42:33 +0300 |
commit | 2a02f8379bde89472cddb49dc8e55a17e0b68eed (patch) | |
tree | b790be03802a14ad4f106ce7c1f221990b468dd6 /net | |
parent | 2f0ff05a44302c91af54a5f9efe1b65b7681540e (diff) | |
download | linux-2a02f8379bde89472cddb49dc8e55a17e0b68eed.tar.xz |
ipv6: use xa_array iterator to implement inet6_netconf_dump_devconf()
1) inet6_netconf_dump_devconf() can run under RCU protection
instead of RTNL.
2) properly return 0 at the end of a dump, avoiding an
an extra recvmsg() system call.
3) Do not use inet6_base_seq() anymore, for_each_netdev_dump()
has nice properties. Restarting a GETDEVCONF dump if a device has
been added/removed or if net->ipv6.dev_addr_genid has changed is moot.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r-- | net/ipv6/addrconf.c | 102 |
1 files changed, 44 insertions, 58 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 436d9a6e6a82..2f84e6ecf19f 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -727,17 +727,18 @@ static u32 inet6_base_seq(const struct net *net) return res; } - static int inet6_netconf_dump_devconf(struct sk_buff *skb, struct netlink_callback *cb) { const struct nlmsghdr *nlh = cb->nlh; struct net *net = sock_net(skb->sk); - int h, s_h; - int idx, s_idx; + struct { + unsigned long ifindex; + unsigned int all_default; + } *ctx = (void *)cb->ctx; struct net_device *dev; struct inet6_dev *idev; - struct hlist_head *head; + int err = 0; if (cb->strict_check) { struct netlink_ext_ack *extack = cb->extack; @@ -754,64 +755,48 @@ static int inet6_netconf_dump_devconf(struct sk_buff *skb, } } - s_h = cb->args[0]; - s_idx = idx = cb->args[1]; - - for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { - idx = 0; - head = &net->dev_index_head[h]; - rcu_read_lock(); - cb->seq = inet6_base_seq(net); - hlist_for_each_entry_rcu(dev, head, index_hlist) { - if (idx < s_idx) - goto cont; - idev = __in6_dev_get(dev); - if (!idev) - goto cont; - - if (inet6_netconf_fill_devconf(skb, dev->ifindex, - &idev->cnf, - NETLINK_CB(cb->skb).portid, - nlh->nlmsg_seq, - RTM_NEWNETCONF, - NLM_F_MULTI, - NETCONFA_ALL) < 0) { - rcu_read_unlock(); - goto done; - } - nl_dump_check_consistent(cb, nlmsg_hdr(skb)); -cont: - idx++; - } - rcu_read_unlock(); + rcu_read_lock(); + for_each_netdev_dump(net, dev, ctx->ifindex) { + idev = __in6_dev_get(dev); + if (!idev) + continue; + err = inet6_netconf_fill_devconf(skb, dev->ifindex, + &idev->cnf, + NETLINK_CB(cb->skb).portid, + nlh->nlmsg_seq, + RTM_NEWNETCONF, + NLM_F_MULTI, + NETCONFA_ALL); + if (err < 0) + goto done; } - if (h == NETDEV_HASHENTRIES) { - if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, - net->ipv6.devconf_all, - NETLINK_CB(cb->skb).portid, - nlh->nlmsg_seq, - RTM_NEWNETCONF, NLM_F_MULTI, - NETCONFA_ALL) < 0) + if (ctx->all_default == 0) { + err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, + net->ipv6.devconf_all, + NETLINK_CB(cb->skb).portid, + nlh->nlmsg_seq, + RTM_NEWNETCONF, NLM_F_MULTI, + NETCONFA_ALL); + if (err < 0) goto done; - else - h++; - } - if (h == NETDEV_HASHENTRIES + 1) { - if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, - net->ipv6.devconf_dflt, - NETLINK_CB(cb->skb).portid, - nlh->nlmsg_seq, - RTM_NEWNETCONF, NLM_F_MULTI, - NETCONFA_ALL) < 0) + ctx->all_default++; + } + if (ctx->all_default == 1) { + err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, + net->ipv6.devconf_dflt, + NETLINK_CB(cb->skb).portid, + nlh->nlmsg_seq, + RTM_NEWNETCONF, NLM_F_MULTI, + NETCONFA_ALL); + if (err < 0) goto done; - else - h++; + ctx->all_default++; } done: - cb->args[0] = h; - cb->args[1] = idx; - - return skb->len; + if (err < 0 && likely(skb->len)) + err = skb->len; + rcu_read_unlock(); + return err; } #ifdef CONFIG_SYSCTL @@ -7503,7 +7488,8 @@ int __init addrconf_init(void) err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, inet6_netconf_dump_devconf, - RTNL_FLAG_DOIT_UNLOCKED); + RTNL_FLAG_DOIT_UNLOCKED | + RTNL_FLAG_DUMP_UNLOCKED); if (err < 0) goto errout; err = ipv6_addr_label_rtnl_register(); |