From a399a8053164ec8bcb06fed52be9941a26ecde11 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 8 Aug 2012 21:13:53 +0000 Subject: time: jiffies_delta_to_clock_t() helper to the rescue MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Various /proc/net files sometimes report crazy timer values, expressed in clock_t units. This happens when an expired timer delta (expires - jiffies) is passed to jiffies_to_clock_t(). This function has an overflow in : return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ); commit cbbc719fccdb8cb (time: Change jiffies_to_clock_t() argument type to unsigned long) only got around the problem. As we cant output negative values in /proc/net/tcp without breaking various tools, I suggest adding a jiffies_delta_to_clock_t() wrapper that caps the negative delta to a 0 value. Signed-off-by: Eric Dumazet Reported-by: Maciej Żenczykowski Cc: Thomas Gleixner Cc: Paul Gortmaker Cc: Andrew Morton Cc: hank Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/core/rtnetlink.c') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 2c5a0a06c4ce..db037c9a4c48 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -618,7 +618,7 @@ int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, long expires, u32 error) { struct rta_cacheinfo ci = { - .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), + .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse), .rta_used = dst->__use, .rta_clntref = atomic_read(&(dst->__refcnt)), .rta_error = error, -- cgit v1.2.3 From 9c7dafbfab1554705f85523fead578aa1a3d338c Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Wed, 8 Aug 2012 21:52:46 +0000 Subject: net: Allow to create links with given ifindex Currently the RTM_NEWLINK results in -EOPNOTSUPP if the ifinfomsg->ifi_index is not zero. I propose to allow requesting ifindices on link creation. This is required by the checkpoint-restore to correctly restore a net namespace (i.e. -- a container). Signed-off-by: Pavel Emelyanov Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'net/core/rtnetlink.c') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index db037c9a4c48..34d975b0f277 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1812,8 +1812,6 @@ replay: return -ENODEV; } - if (ifm->ifi_index) - return -EOPNOTSUPP; if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) return -EOPNOTSUPP; @@ -1839,10 +1837,14 @@ replay: return PTR_ERR(dest_net); dev = rtnl_create_link(net, dest_net, ifname, ops, tb); - - if (IS_ERR(dev)) + if (IS_ERR(dev)) { err = PTR_ERR(dev); - else if (ops->newlink) + goto out; + } + + dev->ifindex = ifm->ifi_index; + + if (ops->newlink) err = ops->newlink(net, dev, tb, data); else err = register_netdevice(dev); -- cgit v1.2.3 From 0115e8e30d6fcdd4b8faa30d3ffd90859a591f51 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 22 Aug 2012 17:19:46 +0000 Subject: net: remove delay at device dismantle I noticed extra one second delay in device dismantle, tracked down to a call to dst_dev_event() while some call_rcu() are still in RCU queues. These call_rcu() were posted by rt_free(struct rtable *rt) calls. We then wait a little (but one second) in netdev_wait_allrefs() before kicking again NETDEV_UNREGISTER. As the call_rcu() are now completed, dst_dev_event() can do the needed device swap on busy dst. To solve this problem, add a new NETDEV_UNREGISTER_FINAL, called after a rcu_barrier(), but outside of RTNL lock. Use NETDEV_UNREGISTER_FINAL with care ! Change dst_dev_event() handler to react to NETDEV_UNREGISTER_FINAL Also remove NETDEV_UNREGISTER_BATCH, as its not used anymore after IP cache removal. With help from Gao feng Signed-off-by: Eric Dumazet Cc: Tom Herbert Cc: Mahesh Bandewar Cc: "Eric W. Biederman" Cc: Gao feng Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/core/rtnetlink.c') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 34d975b0f277..c64efcff8078 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2358,7 +2358,7 @@ static int rtnetlink_event(struct notifier_block *this, unsigned long event, voi case NETDEV_PRE_TYPE_CHANGE: case NETDEV_GOING_DOWN: case NETDEV_UNREGISTER: - case NETDEV_UNREGISTER_BATCH: + case NETDEV_UNREGISTER_FINAL: case NETDEV_RELEASE: case NETDEV_JOIN: break; -- cgit v1.2.3 From 9785e10aedfa0fad5c1aac709dce5ada1b123783 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sat, 8 Sep 2012 02:53:53 +0000 Subject: netlink: kill netlink_set_nonroot Replace netlink_set_nonroot by one new field `flags' in struct netlink_kernel_cfg that is passed to netlink_kernel_create. This patch also renames NL_NONROOT_* to NL_CFG_F_NONROOT_* since now the flags field in nl_table is generic (so we can add more flags if needed in the future). Also adjust all callers in the net-next tree to use these flags instead of netlink_set_nonroot. Signed-off-by: Pablo Neira Ayuso Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/core/rtnetlink.c') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index c64efcff8078..a71806eb9cc6 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2381,6 +2381,7 @@ static int __net_init rtnetlink_net_init(struct net *net) .groups = RTNLGRP_MAX, .input = rtnetlink_rcv, .cb_mutex = &rtnl_mutex, + .flags = NL_CFG_F_NONROOT_RECV, }; sk = netlink_kernel_create(net, NETLINK_ROUTE, THIS_MODULE, &cfg); @@ -2416,7 +2417,6 @@ void __init rtnetlink_init(void) if (register_pernet_subsys(&rtnetlink_net_ops)) panic("rtnetlink_init: cannot initialize rtnetlink\n"); - netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); register_netdevice_notifier(&rtnetlink_dev_notifier); rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, -- cgit v1.2.3 From 9f00d9776bc5beb92e8bfc884a7e96ddc5589e2e Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sat, 8 Sep 2012 02:53:54 +0000 Subject: netlink: hide struct module parameter in netlink_kernel_create This patch defines netlink_kernel_create as a wrapper function of __netlink_kernel_create to hide the struct module *me parameter (which seems to be THIS_MODULE in all existing netlink subsystems). Suggested by David S. Miller. Signed-off-by: Pablo Neira Ayuso Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/core/rtnetlink.c') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index a71806eb9cc6..508c5df4a09c 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2384,7 +2384,7 @@ static int __net_init rtnetlink_net_init(struct net *net) .flags = NL_CFG_F_NONROOT_RECV, }; - sk = netlink_kernel_create(net, NETLINK_ROUTE, THIS_MODULE, &cfg); + sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg); if (!sk) return -ENOMEM; net->rtnl = sk; -- cgit v1.2.3 From 15e473046cb6e5d18a4d0057e61d76315230382b Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Fri, 7 Sep 2012 20:12:54 +0000 Subject: netlink: Rename pid to portid to avoid confusion It is a frequent mistake to confuse the netlink port identifier with a process identifier. Try to reduce this confusion by renaming fields that hold port identifiers portid instead of pid. I have carefully avoided changing the structures exported to userspace to avoid changing the userspace API. I have successfully built an allyesconfig kernel with this change. Signed-off-by: "Eric W. Biederman" Acked-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'net/core/rtnetlink.c') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 508c5df4a09c..92575370d9f0 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1081,7 +1081,7 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) if (idx < s_idx) goto cont; if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, - NETLINK_CB(cb->skb).pid, + NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 0, NLM_F_MULTI, ext_filter_mask) <= 0) @@ -1899,14 +1899,14 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) if (nskb == NULL) return -ENOBUFS; - err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, + err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, 0, ext_filter_mask); if (err < 0) { /* -EMSGSIZE implies BUG in if_nlmsg_size */ WARN_ON(err == -EMSGSIZE); kfree_skb(nskb); } else - err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); + err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid); return err; } @@ -2180,9 +2180,9 @@ static int nlmsg_populate_fdb(struct sk_buff *skb, { struct netdev_hw_addr *ha; int err; - u32 pid, seq; + u32 portid, seq; - pid = NETLINK_CB(cb->skb).pid; + portid = NETLINK_CB(cb->skb).portid; seq = cb->nlh->nlmsg_seq; list_for_each_entry(ha, &list->list, list) { @@ -2190,7 +2190,7 @@ static int nlmsg_populate_fdb(struct sk_buff *skb, goto skip; err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, - pid, seq, 0, NTF_SELF); + portid, seq, 0, NTF_SELF); if (err < 0) return err; skip: -- cgit v1.2.3 From edc7d57327bd08bfd04f41531d49b176369db218 Mon Sep 17 00:00:00 2001 From: stephen hemminger Date: Mon, 1 Oct 2012 12:32:33 +0000 Subject: netlink: add attributes to fdb interface Later changes need to be able to refer to neighbour attributes when doing fdb_add. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'net/core/rtnetlink.c') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 92575370d9f0..76d4c2c3c89b 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2090,7 +2090,8 @@ static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) && (dev->priv_flags & IFF_BRIDGE_PORT)) { master = dev->master; - err = master->netdev_ops->ndo_fdb_add(ndm, dev, addr, + err = master->netdev_ops->ndo_fdb_add(ndm, tb, + dev, addr, nlh->nlmsg_flags); if (err) goto out; @@ -2100,7 +2101,8 @@ static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) /* Embedded bridge, macvlan, and any other device support */ if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_add) { - err = dev->netdev_ops->ndo_fdb_add(ndm, dev, addr, + err = dev->netdev_ops->ndo_fdb_add(ndm, tb, + dev, addr, nlh->nlmsg_flags); if (!err) { -- cgit v1.2.3