From 85bd05deb35a55f04faaf4393faaaa0f3153d515 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Tue, 16 Apr 2019 14:36:01 -0700 Subject: [PATCH] ipv6: Pass fib6_result to ip6_rt_cache_alloc Change ip6_rt_cache_alloc to take a fib6_result over a fib6_info. Since ip6_rt_cache_alloc is only the caller, update the rt6_is_gw_or_nonexthop helper to take fib6_result. Signed-off-by: David Ahern Signed-off-by: David S. Miller --- net/ipv6/route.c | 48 ++++++++++++++++++++++++++---------------------- 1 file changed, 26 insertions(+), 22 deletions(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index e3c5f95550bc..5dd6113c8f8f 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -784,9 +784,10 @@ static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn, return match ? match : net->ipv6.fib6_null_entry; } -static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt) +static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res) { - return (rt->fib6_flags & RTF_NONEXTHOP) || rt->fib6_nh.fib_nh_gw_family; + return (res->f6i->fib6_flags & RTF_NONEXTHOP) || + res->nh->fib_nh_gw_family; } #ifdef CONFIG_IPV6_ROUTE_INFO @@ -1174,10 +1175,11 @@ int ip6_ins_rt(struct net *net, struct fib6_info *rt) return __ip6_ins_rt(rt, &info, NULL); } -static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort, +static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res, const struct in6_addr *daddr, const struct in6_addr *saddr) { + struct fib6_info *f6i = res->f6i; struct net_device *dev; struct rt6_info *rt; @@ -1185,25 +1187,25 @@ static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort, * Clone the route. */ - if (!fib6_info_hold_safe(ort)) + if (!fib6_info_hold_safe(f6i)) return NULL; - dev = ip6_rt_get_dev_rcu(ort); + dev = ip6_rt_get_dev_rcu(f6i); rt = ip6_dst_alloc(dev_net(dev), dev, 0); if (!rt) { - fib6_info_release(ort); + fib6_info_release(f6i); return NULL; } - ip6_rt_copy_init(rt, ort); + ip6_rt_copy_init(rt, res->f6i); rt->rt6i_flags |= RTF_CACHE; rt->dst.flags |= DST_HOST; rt->rt6i_dst.addr = *daddr; rt->rt6i_dst.plen = 128; - if (!rt6_is_gw_or_nonexthop(ort)) { - if (ort->fib6_dst.plen != 128 && - ipv6_addr_equal(&ort->fib6_dst.addr, daddr)) + if (!rt6_is_gw_or_nonexthop(res)) { + if (f6i->fib6_dst.plen != 128 && + ipv6_addr_equal(&f6i->fib6_dst.addr, daddr)) rt->rt6i_flags |= RTF_ANYCAST; #ifdef CONFIG_IPV6_SUBTREES if (rt->rt6i_src.plen && saddr) { @@ -1885,7 +1887,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, */ struct rt6_info *uncached_rt; - uncached_rt = ip6_rt_cache_alloc(res.f6i, &fl6->daddr, NULL); + uncached_rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL); rcu_read_unlock(); @@ -2329,19 +2331,20 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, if (rt6->rt6i_flags & RTF_CACHE) rt6_update_exception_stamp_rt(rt6); } else if (daddr) { - struct fib6_info *from; + struct fib6_result res = {}; struct rt6_info *nrt6; rcu_read_lock(); - from = rcu_dereference(rt6->from); - if (!from) { + res.f6i = rcu_dereference(rt6->from); + if (!res.f6i) { rcu_read_unlock(); return; } - nrt6 = ip6_rt_cache_alloc(from, daddr, saddr); + res.nh = &res.f6i->fib6_nh; + nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr); if (nrt6) { rt6_do_update_pmtu(nrt6, mtu); - if (rt6_insert_exception(nrt6, from)) + if (rt6_insert_exception(nrt6, res.f6i)) dst_release_immediate(&nrt6->dst); } rcu_read_unlock(); @@ -3364,10 +3367,10 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu { struct netevent_redirect netevent; struct rt6_info *rt, *nrt = NULL; + struct fib6_result res = {}; struct ndisc_options ndopts; struct inet6_dev *in6_dev; struct neighbour *neigh; - struct fib6_info *from; struct rd_msg *msg; int optlen, on_link; u8 *lladdr; @@ -3450,14 +3453,15 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu NDISC_REDIRECT, &ndopts); rcu_read_lock(); - from = rcu_dereference(rt->from); + res.f6i = rcu_dereference(rt->from); /* This fib6_info_hold() is safe here because we hold reference to rt * and rt already holds reference to fib6_info. */ - fib6_info_hold(from); + fib6_info_hold(res.f6i); rcu_read_unlock(); - nrt = ip6_rt_cache_alloc(from, &msg->dest, NULL); + res.nh = &res.f6i->fib6_nh; + nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL); if (!nrt) goto out; @@ -3471,7 +3475,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu * a cached route because rt6_insert_exception() will * takes care of it */ - if (rt6_insert_exception(nrt, from)) { + if (rt6_insert_exception(nrt, res.f6i)) { dst_release_immediate(&nrt->dst); goto out; } @@ -3483,7 +3487,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); out: - fib6_info_release(from); + fib6_info_release(res.f6i); neigh_release(neigh); } -- 2.30.2