From dcd1f572954f9d66d7b4a65df894ed5b4c467368 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Wed, 18 Apr 2018 15:39:05 -0700 Subject: [PATCH] net/ipv6: Remove fib6_idev fib6_idev can be obtained from __in6_dev_get on the nexthop device rather than caching it in the fib6_info. Remove it. Signed-off-by: David Ahern Signed-off-by: David S. Miller --- include/net/ip6_fib.h | 1 - net/ipv6/ip6_fib.c | 2 -- net/ipv6/route.c | 66 ++++++++++++++++++++++++++++++------------- 3 files changed, 47 insertions(+), 22 deletions(-) diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h index bd11c990c353..642211174692 100644 --- a/include/net/ip6_fib.h +++ b/include/net/ip6_fib.h @@ -147,7 +147,6 @@ struct fib6_info { unsigned int fib6_nsiblings; atomic_t fib6_ref; - struct inet6_dev *fib6_idev; unsigned long expires; struct dst_metrics *fib6_metrics; #define fib6_pmtu fib6_metrics->metrics[RTAX_MTU-1] diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index 353f0b3e7b0d..f936e91a8c65 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -197,8 +197,6 @@ void fib6_info_destroy(struct fib6_info *f6i) } } - if (f6i->fib6_idev) - in6_dev_put(f6i->fib6_idev); if (f6i->fib6_nh.nh_dev) dev_put(f6i->fib6_nh.nh_dev); diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 8cf4f0623229..08cae7323776 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -525,15 +525,17 @@ static void rt6_probe(struct fib6_info *rt) rcu_read_lock_bh(); neigh = __ipv6_neigh_lookup_noref(dev, nh_gw); if (neigh) { + struct inet6_dev *idev; + if (neigh->nud_state & NUD_VALID) goto out; + idev = __in6_dev_get(dev); work = NULL; write_lock(&neigh->lock); if (!(neigh->nud_state & NUD_VALID) && time_after(jiffies, - neigh->updated + - rt->fib6_idev->cnf.rtr_probe_interval)) { + neigh->updated + idev->cnf.rtr_probe_interval)) { work = kmalloc(sizeof(*work), GFP_ATOMIC); if (work) __neigh_set_probe_once(neigh); @@ -622,18 +624,32 @@ static int rt6_score_route(struct fib6_info *rt, int oif, int strict) return m; } +/* called with rc_read_lock held */ +static inline bool fib6_ignore_linkdown(const struct fib6_info *f6i) +{ + const struct net_device *dev = fib6_info_nh_dev(f6i); + bool rc = false; + + if (dev) { + const struct inet6_dev *idev = __in6_dev_get(dev); + + rc = !!idev->cnf.ignore_routes_with_linkdown; + } + + return rc; +} + static struct fib6_info *find_match(struct fib6_info *rt, int oif, int strict, int *mpri, struct fib6_info *match, bool *do_rr) { int m; bool match_do_rr = false; - struct inet6_dev *idev = rt->fib6_idev; if (rt->fib6_nh.nh_flags & RTNH_F_DEAD) goto out; - if (idev->cnf.ignore_routes_with_linkdown && + if (fib6_ignore_linkdown(rt) && rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN && !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) goto out; @@ -957,12 +973,12 @@ static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from) static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort) { + struct net_device *dev = fib6_info_nh_dev(ort); + ip6_rt_init_dst(rt, ort); rt->rt6i_dst = ort->fib6_dst; - rt->rt6i_idev = ort->fib6_idev; - if (rt->rt6i_idev) - in6_dev_hold(rt->rt6i_idev); + rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; rt->rt6i_gateway = ort->fib6_nh.nh_gw; rt->rt6i_flags = ort->fib6_flags; rt6_set_from(rt, ort); @@ -1355,7 +1371,18 @@ static unsigned int fib6_mtu(const struct fib6_info *rt) { unsigned int mtu; - mtu = rt->fib6_pmtu ? : rt->fib6_idev->cnf.mtu6; + if (rt->fib6_pmtu) { + mtu = rt->fib6_pmtu; + } else { + struct net_device *dev = fib6_info_nh_dev(rt); + struct inet6_dev *idev; + + rcu_read_lock(); + idev = __in6_dev_get(dev); + mtu = idev->cnf.mtu6; + rcu_read_unlock(); + } + mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); return mtu - lwtunnel_headroom(rt->fib6_nh.nh_lwtstate, mtu); @@ -2985,11 +3012,13 @@ install_route: rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN; rt->fib6_nh.nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK); rt->fib6_nh.nh_dev = dev; - rt->fib6_idev = idev; rt->fib6_table = table; cfg->fc_nlinfo.nl_net = dev_net(dev); + if (idev) + in6_dev_put(idev); + return rt; out: if (dev) @@ -3425,8 +3454,11 @@ static void __rt6_purge_dflt_routers(struct net *net, restart: rcu_read_lock(); for_each_fib6_node_rt_rcu(&table->tb6_root) { + struct net_device *dev = fib6_info_nh_dev(rt); + struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL; + if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) && - (!rt->fib6_idev || rt->fib6_idev->cnf.accept_ra != 2)) { + (!idev || idev->cnf.accept_ra != 2)) { fib6_info_hold(rt); rcu_read_unlock(); ip6_del_rt(net, rt); @@ -3585,10 +3617,6 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net, return ERR_PTR(-ENOMEM); f6i->dst_nocount = true; - - in6_dev_hold(idev); - f6i->fib6_idev = idev; - f6i->dst_host = true; f6i->fib6_protocol = RTPROT_KERNEL; f6i->fib6_flags = RTF_UP | RTF_NONEXTHOP; @@ -3706,7 +3734,7 @@ static bool rt6_is_dead(const struct fib6_info *rt) { if (rt->fib6_nh.nh_flags & RTNH_F_DEAD || (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN && - rt->fib6_idev->cnf.ignore_routes_with_linkdown)) + fib6_ignore_linkdown(rt))) return true; return false; @@ -4424,8 +4452,11 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt, if (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN) { *flags |= RTNH_F_LINKDOWN; - if (rt->fib6_idev->cnf.ignore_routes_with_linkdown) + + rcu_read_lock(); + if (fib6_ignore_linkdown(rt)) *flags |= RTNH_F_DEAD; + rcu_read_unlock(); } if (rt->fib6_flags & RTF_GATEWAY) { @@ -4800,7 +4831,6 @@ static int ip6_route_dev_notify(struct notifier_block *this, if (event == NETDEV_REGISTER) { net->ipv6.fib6_null_entry->fib6_nh.nh_dev = dev; - net->ipv6.fib6_null_entry->fib6_idev = in6_dev_get(dev); net->ipv6.ip6_null_entry->dst.dev = dev; net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); #ifdef CONFIG_IPV6_MULTIPLE_TABLES @@ -4814,7 +4844,6 @@ static int ip6_route_dev_notify(struct notifier_block *this, /* NETDEV_UNREGISTER could be fired for multiple times by * netdev_wait_allrefs(). Make sure we only call this once. */ - in6_dev_put_clear(&net->ipv6.fib6_null_entry->fib6_idev); in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); #ifdef CONFIG_IPV6_MULTIPLE_TABLES in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); @@ -5137,7 +5166,6 @@ void __init ip6_route_init_special_entries(void) * the loopback reference in rt6_info will not be taken, do it * manually for init_net */ init_net.ipv6.fib6_null_entry->fib6_nh.nh_dev = init_net.loopback_dev; - init_net.ipv6.fib6_null_entry->fib6_idev = in6_dev_get(init_net.loopback_dev); init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); #ifdef CONFIG_IPV6_MULTIPLE_TABLES