[PATCH v2 net-next 07/13] ipv6: Move gateway checks to a fib6_nh setting
From: David Ahern <dsahern@kernel.org>
Date: 2019-03-27 18:38:22
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [networking] (tcx & tc bpf, sock_addr), mellanox ethernet switch drivers, networking drivers, networking [general], networking [ipv4/ipv6], the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Ido Schimmel, Petr Machata, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Linus Torvalds
From: David Ahern <redacted> The gateway setting is not per fib6_info entry but per-fib6_nh. Add a new fib_nh_has_gw flag to fib6_nh and convert references to RTF_GATEWAY to the new flag. For IPv6 address the flag is cheaper than checking that nh_gw is non-0 like IPv4 does. While this increases fib6_nh by 8-bytes, the effective allocation size of a fib6_info is unchanged. The 8 bytes is recovered later with the fib_nh_common change. Signed-off-by: David Ahern <redacted> --- .../net/ethernet/mellanox/mlxsw/spectrum_router.c | 4 ++-- include/net/ip6_fib.h | 1 + include/net/ip6_route.h | 4 ++-- net/core/filter.c | 2 +- net/ipv6/addrconf.c | 25 +++++++++++---------- net/ipv6/ip6_fib.c | 9 +++++--- net/ipv6/route.c | 26 +++++++++++++--------- 7 files changed, 41 insertions(+), 30 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 52fed8c7bf1e..663d819a2a32 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c@@ -4913,7 +4913,7 @@ static void mlxsw_sp_rt6_destroy(struct mlxsw_sp_rt6 *mlxsw_sp_rt6) static bool mlxsw_sp_fib6_rt_can_mp(const struct fib6_info *rt) { /* RTF_CACHE routes are ignored */ - return (rt->fib6_flags & (RTF_GATEWAY | RTF_ADDRCONF)) == RTF_GATEWAY; + return !(rt->fib6_flags & RTF_ADDRCONF) && rt->fib6_nh.fib_nh_has_gw; } static struct fib6_info *
@@ -5053,7 +5053,7 @@ static void mlxsw_sp_nexthop6_fini(struct mlxsw_sp *mlxsw_sp, static bool mlxsw_sp_rt6_is_gateway(const struct mlxsw_sp *mlxsw_sp, const struct fib6_info *rt) { - return rt->fib6_flags & RTF_GATEWAY || + return rt->fib6_nh.fib_nh_has_gw || mlxsw_sp_nexthop6_ipip_type(mlxsw_sp, rt, NULL); }
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 2d2a468b3d6d..3b04b318cf13 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h@@ -126,6 +126,7 @@ struct rt6_exception { struct fib6_nh { struct in6_addr nh_gw; + bool fib_nh_has_gw; struct net_device *nh_dev; struct lwtunnel_state *nh_lwtstate;
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 7ab119936e69..95cd8a2f6284 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h@@ -68,8 +68,8 @@ static inline bool rt6_need_strict(const struct in6_addr *daddr) static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i) { - return (f6i->fib6_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) == - RTF_GATEWAY; + return !(f6i->fib6_flags & (RTF_ADDRCONF|RTF_DYNAMIC)) && + f6i->fib6_nh.fib_nh_has_gw; } void ip6_route_input(struct sk_buff *skb);
diff --git a/net/core/filter.c b/net/core/filter.c
index 647c63a7b25b..248207171475 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c@@ -4677,7 +4677,7 @@ static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, if (f6i->fib6_nh.nh_lwtstate) return BPF_FIB_LKUP_RET_UNSUPP_LWT; - if (f6i->fib6_flags & RTF_GATEWAY) + if (f6i->fib6_nh.fib_nh_has_gw) *dst = f6i->fib6_nh.nh_gw; dev = f6i->fib6_nh.nh_dev;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 4ae17a966ae3..c5ac08fc6cc9 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c@@ -173,7 +173,8 @@ static int addrconf_ifdown(struct net_device *dev, int how); static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, int plen, const struct net_device *dev, - u32 flags, u32 noflags); + u32 flags, u32 noflags, + bool no_gw); static void addrconf_dad_start(struct inet6_ifaddr *ifp); static void addrconf_dad_work(struct work_struct *w);
@@ -1230,10 +1231,8 @@ cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_r { struct fib6_info *f6i; - f6i = addrconf_get_prefix_route(&ifp->addr, - ifp->prefix_len, - ifp->idev->dev, - 0, RTF_GATEWAY | RTF_DEFAULT); + f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len, + ifp->idev->dev, 0, RTF_DEFAULT, true); if (f6i) { if (del_rt) ip6_del_rt(dev_net(ifp->idev->dev), f6i);
@@ -2402,7 +2401,8 @@ addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, int plen, const struct net_device *dev, - u32 flags, u32 noflags) + u32 flags, u32 noflags, + bool no_gw) { struct fib6_node *fn; struct fib6_info *rt = NULL;
@@ -2421,6 +2421,8 @@ static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, for_each_fib6_node_rt_rcu(fn) { if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) continue; + if (no_gw && rt->fib6_nh.fib_nh_has_gw) + continue; if ((rt->fib6_flags & flags) != flags) continue; if ((rt->fib6_flags & noflags) != 0)
@@ -2717,7 +2719,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) pinfo->prefix_len, dev, RTF_ADDRCONF | RTF_PREFIX_RT, - RTF_GATEWAY | RTF_DEFAULT); + RTF_DEFAULT, true); if (rt) { /* Autoconf prefix route */
@@ -4588,10 +4590,8 @@ static int modify_prefix_route(struct inet6_ifaddr *ifp, struct fib6_info *f6i; u32 prio; - f6i = addrconf_get_prefix_route(&ifp->addr, - ifp->prefix_len, - ifp->idev->dev, - 0, RTF_GATEWAY | RTF_DEFAULT); + f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len, + ifp->idev->dev, 0, RTF_DEFAULT, true); if (!f6i) return -ENOENT;
@@ -5972,7 +5972,8 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) struct fib6_info *rt; rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, - ifp->idev->dev, 0, 0); + ifp->idev->dev, 0, 0, + false); if (rt) ip6_del_rt(net, rt); }
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index db886085369b..91ce84ecdb57 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c@@ -2294,6 +2294,7 @@ static int ipv6_route_seq_show(struct seq_file *seq, void *v) { struct fib6_info *rt = v; struct ipv6_route_iter *iter = seq->private; + unsigned int flags = rt->fib6_flags; const struct net_device *dev; seq_printf(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen);
@@ -2303,15 +2304,17 @@ static int ipv6_route_seq_show(struct seq_file *seq, void *v) #else seq_puts(seq, "00000000000000000000000000000000 00 "); #endif - if (rt->fib6_flags & RTF_GATEWAY) + if (rt->fib6_nh.fib_nh_has_gw) { + flags |= RTF_GATEWAY; seq_printf(seq, "%pi6", &rt->fib6_nh.nh_gw); - else + } else { seq_puts(seq, "00000000000000000000000000000000"); + } dev = rt->fib6_nh.nh_dev; seq_printf(seq, " %08x %08x %08x %08x %8s\n", rt->fib6_metric, atomic_read(&rt->fib6_ref), 0, - rt->fib6_flags, dev ? dev->name : ""); + flags, dev ? dev->name : ""); iter->w.leaf = NULL; return 0; }
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index bd910a266aa7..0e96f7994d9e 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c@@ -533,7 +533,7 @@ static void rt6_probe(struct fib6_info *rt) * Router Reachability Probe MUST be rate-limited * to no more than one per minute. */ - if (!rt || !(rt->fib6_flags & RTF_GATEWAY)) + if (!rt || !rt->fib6_nh.fib_nh_has_gw) return; nh_gw = &rt->fib6_nh.nh_gw;
@@ -595,7 +595,7 @@ static inline enum rt6_nud_state rt6_check_neigh(struct fib6_info *rt) struct neighbour *neigh; if (rt->fib6_flags & RTF_NONEXTHOP || - !(rt->fib6_flags & RTF_GATEWAY)) + !rt->fib6_nh.fib_nh_has_gw) return RT6_NUD_SUCCEED; rcu_read_lock_bh();
@@ -784,7 +784,7 @@ static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn, static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt) { - return (rt->fib6_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); + return (rt->fib6_flags & RTF_NONEXTHOP) || rt->fib6_nh.fib_nh_has_gw; } #ifdef CONFIG_IPV6_ROUTE_INFO
@@ -989,8 +989,11 @@ static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort) rt->rt6i_dst = ort->fib6_dst; rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; - rt->rt6i_gateway = ort->fib6_nh.nh_gw; rt->rt6i_flags = ort->fib6_flags; + if (ort->fib6_nh.fib_nh_has_gw) { + rt->rt6i_gateway = ort->fib6_nh.nh_gw; + rt->rt6i_flags |= RTF_GATEWAY; + } rt6_set_from(rt, ort); #ifdef CONFIG_IPV6_SUBTREES rt->rt6i_src = ort->fib6_src;
@@ -1870,7 +1873,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, rcu_read_unlock(); return rt; } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && - !(f6i->fib6_flags & RTF_GATEWAY))) { + !f6i->fib6_nh.fib_nh_has_gw)) { /* Create a RTF_CACHE clone which will not be * owned by the fib6 tree. It is for the special case where * the daddr in the skb during the neighbor look-up is different
@@ -2440,7 +2443,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net, continue; if (rt->fib6_flags & RTF_REJECT) break; - if (!(rt->fib6_flags & RTF_GATEWAY)) + if (!rt->fib6_nh.fib_nh_has_gw) continue; if (fl6->flowi6_oif != rt->fib6_nh.nh_dev->ifindex) continue;
@@ -2977,6 +2980,7 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, goto out; fib6_nh->nh_gw = cfg->fc_gateway; + fib6_nh->fib_nh_has_gw = 1; } err = -ENODEV;
@@ -3138,7 +3142,7 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, } else rt->fib6_prefsrc.plen = 0; - rt->fib6_flags = cfg->fc_flags; + rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY; return rt; out:
@@ -3474,7 +3478,8 @@ static struct fib6_info *rt6_get_route_info(struct net *net, for_each_fib6_node_rt_rcu(fn) { if (rt->fib6_nh.nh_dev->ifindex != ifindex) continue; - if ((rt->fib6_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) + if (!(rt->fib6_flags & RTF_ROUTEINFO) || + !rt->fib6_nh.fib_nh_has_gw) continue; if (!ipv6_addr_equal(&rt->fib6_nh.nh_gw, gwaddr)) continue;
@@ -3795,7 +3800,7 @@ void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) fib6_clean_all(net, fib6_remove_prefsrc, &adni); } -#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) +#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT) /* Remove routers and update dst entries when gateway turn into host. */ static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
@@ -3803,6 +3808,7 @@ static int fib6_clean_tohost(struct fib6_info *rt, void *arg) struct in6_addr *gateway = (struct in6_addr *)arg; if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && + rt->fib6_nh.fib_nh_has_gw && ipv6_addr_equal(gateway, &rt->fib6_nh.nh_gw)) { return -1; }
@@ -4591,7 +4597,7 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt, rcu_read_unlock(); } - if (rt->fib6_flags & RTF_GATEWAY) { + if (rt->fib6_nh.fib_nh_has_gw) { if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->fib6_nh.nh_gw) < 0) goto nla_put_failure; }
--
2.11.0