[PATCH net 5/6] ipv4: Add FLOWI_FLAG_KNOWN_NH
flat view
STALE5120d
SUPERSEDED
From: Julian Anastasov <ja@ssi.bg>
Date: 2012-10-07 11:20:57
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
Revision v1 of 2 in this series.
Revisions (2)
- v1 current
- v2 [diff vs current]
Add flag to request that output route should be returned with known rt_gateway, in case we want to use it as nexthop for neighbour resolving. The returned route can be cached as follows: - in NH exception: because the cached routes are not shared with other destinations - in FIB NH: when using gateway because all destinations for NH share same gateway As last option, to return rt_gateway!=0 we have to set DST_NOCACHE. Signed-off-by: Julian Anastasov <ja@ssi.bg> --- include/net/flow.h | 1 + net/ipv4/route.c | 11 ++++++++++- 2 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/include/net/flow.h b/include/net/flow.h
index e1dd508..628e11b 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h@@ -21,6 +21,7 @@ struct flowi_common { __u8 flowic_flags; #define FLOWI_FLAG_ANYSRC 0x01 #define FLOWI_FLAG_CAN_SLEEP 0x02 +#define FLOWI_FLAG_KNOWN_NH 0x04 __u32 flowic_secid; };
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index eaf9575..7f20b6e 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c@@ -1763,6 +1763,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res, struct in_device *in_dev; u16 type = res->type; struct rtable *rth; + bool do_cache; in_dev = __in_dev_get_rcu(dev_out); if (!in_dev)
@@ -1799,6 +1800,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res, } fnhe = NULL; + do_cache = fi != NULL; if (fi) { struct rtable __rcu **prth; struct fib_nh *nh = &FIB_RES_NH(*res);
@@ -1807,6 +1809,13 @@ static struct rtable *__mkroute_output(const struct fib_result *res, if (fnhe) prth = &fnhe->fnhe_rth; else { + if (unlikely(fl4->flowi4_flags & + FLOWI_FLAG_KNOWN_NH && + !(nh->nh_gw && + nh->nh_scope == RT_SCOPE_LINK))) { + do_cache = false; + goto add; + } if (!nh->nh_pcpu_rth_output) goto add; prth = __this_cpu_ptr(nh->nh_pcpu_rth_output);
@@ -1822,7 +1831,7 @@ add: rth = rt_dst_alloc(dev_out, IN_DEV_CONF_GET(in_dev, NOPOLICY), IN_DEV_CONF_GET(in_dev, NOXFRM), - fi); + do_cache); if (!rth) return ERR_PTR(-ENOBUFS);
--
1.7.3.4