From 0c4dcd58fd69aded93b0dc6917cd88b262c8aa3f Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 17 Feb 2011 15:42:37 -0800 Subject: [PATCH] ipv4: Consolidate ipv4 dst allocation logic. This also allows us to combine all the dst->flags settings and avoid read/modify/write sequences to this struct member. Signed-off-by: David S. Miller --- net/ipv4/route.c | 52 +++++++++++++++++++----------------------------- 1 file changed, 21 insertions(+), 31 deletions(-) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index b2b3c9e0a618..79a287181025 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1816,6 +1816,21 @@ static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) rt->rt_type = res->type; } +static struct rtable *rt_dst_alloc(bool nopolicy, bool noxfrm) +{ + struct rtable *rt = dst_alloc(&ipv4_dst_ops); + if (rt) { + rt->dst.obsolete = -1; + + atomic_set(&rt->dst.__refcnt, 1); + + rt->dst.flags = DST_HOST | + (nopolicy ? DST_NOPOLICY : 0) | + (noxfrm ? DST_NOXFRM : 0); + } + return rt; +} + /* called in rcu_read_lock() section */ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, u8 tos, struct net_device *dev, int our) @@ -1846,17 +1861,12 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, if (err < 0) goto e_err; } - rth = dst_alloc(&ipv4_dst_ops); + rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), false); if (!rth) goto e_nobufs; rth->dst.output = ip_rt_bug; - rth->dst.obsolete = -1; - atomic_set(&rth->dst.__refcnt, 1); - rth->dst.flags= DST_HOST; - if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) - rth->dst.flags |= DST_NOPOLICY; rth->fl.fl4_dst = daddr; rth->rt_dst = daddr; rth->fl.fl4_tos = tos; @@ -1985,19 +1995,13 @@ static int __mkroute_input(struct sk_buff *skb, } } - - rth = dst_alloc(&ipv4_dst_ops); + rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), + IN_DEV_CONF_GET(out_dev, NOXFRM)); if (!rth) { err = -ENOBUFS; goto cleanup; } - atomic_set(&rth->dst.__refcnt, 1); - rth->dst.flags= DST_HOST; - if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) - rth->dst.flags |= DST_NOPOLICY; - if (IN_DEV_CONF_GET(out_dev, NOXFRM)) - rth->dst.flags |= DST_NOXFRM; rth->fl.fl4_dst = daddr; rth->rt_dst = daddr; rth->fl.fl4_tos = tos; @@ -2012,7 +2016,6 @@ static int __mkroute_input(struct sk_buff *skb, rth->fl.oif = 0; rth->rt_spec_dst= spec_dst; - rth->dst.obsolete = -1; rth->dst.input = ip_forward; rth->dst.output = ip_output; rth->rt_genid = rt_genid(dev_net(rth->dst.dev)); @@ -2162,18 +2165,13 @@ out: return err; RT_CACHE_STAT_INC(in_brd); local_input: - rth = dst_alloc(&ipv4_dst_ops); + rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), false); if (!rth) goto e_nobufs; rth->dst.output= ip_rt_bug; - rth->dst.obsolete = -1; rth->rt_genid = rt_genid(net); - atomic_set(&rth->dst.__refcnt, 1); - rth->dst.flags= DST_HOST; - if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) - rth->dst.flags |= DST_NOPOLICY; rth->fl.fl4_dst = daddr; rth->rt_dst = daddr; rth->fl.fl4_tos = tos; @@ -2366,18 +2364,11 @@ static struct rtable *__mkroute_output(struct fib_result *res, res->fi = NULL; } - - rth = dst_alloc(&ipv4_dst_ops); + rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), + IN_DEV_CONF_GET(in_dev, NOXFRM)); if (!rth) return ERR_PTR(-ENOBUFS); - atomic_set(&rth->dst.__refcnt, 1); - rth->dst.flags= DST_HOST; - if (IN_DEV_CONF_GET(in_dev, NOXFRM)) - rth->dst.flags |= DST_NOXFRM; - if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) - rth->dst.flags |= DST_NOPOLICY; - rth->fl.fl4_dst = oldflp->fl4_dst; rth->fl.fl4_tos = tos; rth->fl.fl4_src = oldflp->fl4_src; @@ -2394,7 +2385,6 @@ static struct rtable *__mkroute_output(struct fib_result *res, rth->rt_spec_dst= fl->fl4_src; rth->dst.output=ip_output; - rth->dst.obsolete = -1; rth->rt_genid = rt_genid(dev_net(dev_out)); RT_CACHE_STAT_INC(out_slow_tot); -- GitLab