From fc403832f7bd94014fe3d965e0652a857160f1c9 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Tue, 9 Apr 2013 03:47:15 +0000 Subject: [PATCH] net: ipv6: also allow token to be set when device not ready When we set the iftoken in inet6_set_iftoken(), we return -EINVAL when the device does not have flag IF_READY. This is however not necessary and rather an artificial usability barrier, since we simply can set the token despite that, and in case the device is ready, we just send out our rs, otherwise ifup et al. will do this for us anyway. Suggested-by: Hannes Frederic Sowa Signed-off-by: Daniel Borkmann Signed-off-by: David S. Miller --- net/ipv6/addrconf.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 645bf317019f..713ebe303f61 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -4296,9 +4296,9 @@ static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) { - struct in6_addr ll_addr; struct inet6_ifaddr *ifp; struct net_device *dev = idev->dev; + bool update_rs = false; if (token == NULL) return -EINVAL; @@ -4306,8 +4306,6 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) return -EINVAL; if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) return -EINVAL; - if (idev->dead || !(idev->if_flags & IF_READY)) - return -EINVAL; if (!ipv6_accept_ra(idev)) return -EINVAL; if (idev->cnf.rtr_solicits <= 0) @@ -4320,11 +4318,23 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) write_unlock_bh(&idev->lock); - ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | IFA_F_OPTIMISTIC); - ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); + if (!idev->dead && (idev->if_flags & IF_READY)) { + struct in6_addr ll_addr; + + ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | + IFA_F_OPTIMISTIC); + + /* If we're not ready, then normal ifup will take care + * of this. Otherwise, we need to request our rs here. + */ + ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); + update_rs = true; + } write_lock_bh(&idev->lock); - idev->if_flags |= IF_RS_SENT; + + if (update_rs) + idev->if_flags |= IF_RS_SENT; /* Well, that's kinda nasty ... */ list_for_each_entry(ifp, &idev->addr_list, if_list) { -- GitLab