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Message-Id: <1518387989-33735-5-git-send-email-roopa@cumulusnetworks.com>
Date: Sun, 11 Feb 2018 14:26:29 -0800
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: netdev@...r.kernel.org
Cc: dsa@...ulusnetworks.com, nikolay@...ulusnetworks.com
Subject: [PATCH RFC net-next 4/4] ipv6: route: dissect flow in input path if fib rules need it
From: Roopa Prabhu <roopa@...ulusnetworks.com>
Dissect flow in fwd path if fib rules require it. Controlled by
a flag to avoid penatly for the common case. Flag is set when fib
rules with sport, dport and proto match that require flow dissect
are installed. Also passes the dissected hash keys to the multipath
hash function when applicable to avoid dissecting the flow again.
icmp packets will continue to use inner header for hash
calculations.
Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
---
include/net/ip6_route.h | 3 ++-
include/net/netns/ipv6.h | 1 +
net/ipv6/fib6_rules.c | 12 +++++++++---
net/ipv6/icmp.c | 2 +-
net/ipv6/route.c | 45 ++++++++++++++++++++++++++++++++++++---------
5 files changed, 49 insertions(+), 14 deletions(-)
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 27d23a6..218f89c 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -127,7 +127,8 @@ static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
const struct in6_addr *saddr, int oif, int flags);
-u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb);
+u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb,
+ struct flow_keys *hkeys);
struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 987cc45..7aca00e 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -72,6 +72,7 @@ struct netns_ipv6 {
unsigned long ip6_rt_last_gc;
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
bool fib6_has_custom_rules;
+ bool fib6_rules_require_fldissect;
struct rt6_info *ip6_prohibit_entry;
struct rt6_info *ip6_blk_hole_entry;
struct fib6_table *fib6_local_tbl;
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 57c0836..68b946d 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -271,14 +271,20 @@ static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
rule6->dst.plen = frh->dst_len;
rule6->tclass = frh->tos;
- if (tb[FRA_PROTO])
+ if (tb[FRA_PROTO]) {
rule6->proto = nla_get_u8(tb[FRA_PROTO]);
+ net->ipv6.fib6_rules_require_fldissect = true;
+ }
- if (tb[FRA_SPORT])
+ if (tb[FRA_SPORT]) {
rule6->sport = nla_get_be16(tb[FRA_SPORT]);
+ net->ipv6.fib6_rules_require_fldissect = true;
+ }
- if (tb[FRA_DPORT])
+ if (tb[FRA_DPORT]) {
rule6->dport = nla_get_be16(tb[FRA_DPORT]);
+ net->ipv6.fib6_rules_require_fldissect = true;
+ }
net->ipv6.fib6_has_custom_rules = true;
err = 0;
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 6ae5dd3..6997b2c 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -522,7 +522,7 @@ static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
fl6.fl6_icmp_type = type;
fl6.fl6_icmp_code = code;
fl6.flowi6_uid = sock_net_uid(net, NULL);
- fl6.mp_hash = rt6_multipath_hash(&fl6, skb);
+ fl6.mp_hash = rt6_multipath_hash(&fl6, skb, NULL);
security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
sk = icmpv6_xmit_lock(net);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 9dcfadd..742c312 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -460,7 +460,7 @@ static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
* case it will always be non-zero. Otherwise now is the time to do it.
*/
if (!fl6->mp_hash)
- fl6->mp_hash = rt6_multipath_hash(fl6, NULL);
+ fl6->mp_hash = rt6_multipath_hash(fl6, NULL, NULL);
if (fl6->mp_hash <= atomic_read(&match->rt6i_nh_upper_bound))
return match;
@@ -1786,10 +1786,12 @@ struct dst_entry *ip6_route_input_lookup(struct net *net,
EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
static void ip6_multipath_l3_keys(const struct sk_buff *skb,
- struct flow_keys *keys)
+ struct flow_keys *keys,
+ struct flow_keys *flkeys)
{
const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
const struct ipv6hdr *key_iph = outer_iph;
+ struct flow_keys *_flkeys = flkeys;
const struct ipv6hdr *inner_iph;
const struct icmp6hdr *icmph;
struct ipv6hdr _inner_iph;
@@ -1811,22 +1813,31 @@ static void ip6_multipath_l3_keys(const struct sk_buff *skb,
goto out;
key_iph = inner_iph;
+ _flkeys = NULL;
out:
memset(keys, 0, sizeof(*keys));
keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
- keys->addrs.v6addrs.src = key_iph->saddr;
- keys->addrs.v6addrs.dst = key_iph->daddr;
- keys->tags.flow_label = ip6_flowinfo(key_iph);
- keys->basic.ip_proto = key_iph->nexthdr;
+ if (_flkeys) {
+ keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
+ keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
+ keys->tags.flow_label = _flkeys->tags.flow_label;
+ keys->basic.ip_proto = _flkeys->basic.ip_proto;
+ } else {
+ keys->addrs.v6addrs.src = key_iph->saddr;
+ keys->addrs.v6addrs.dst = key_iph->daddr;
+ keys->tags.flow_label = ip6_flowinfo(key_iph);
+ keys->basic.ip_proto = key_iph->nexthdr;
+ }
}
/* if skb is set it will be used and fl6 can be NULL */
-u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb)
+u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb,
+ struct flow_keys *flkeys)
{
struct flow_keys hash_keys;
if (skb) {
- ip6_multipath_l3_keys(skb, &hash_keys);
+ ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
return flow_hash_from_keys(&hash_keys) >> 1;
}
@@ -1847,12 +1858,27 @@ void ip6_route_input(struct sk_buff *skb)
.flowi6_mark = skb->mark,
.flowi6_proto = iph->nexthdr,
};
+ struct flow_keys *flkeys = NULL, _flkeys;
tun_info = skb_tunnel_info(skb);
if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
+
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+ if (net->ipv6.fib6_rules_require_fldissect) {
+ unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
+
+ memset(&_flkeys, 0, sizeof(_flkeys));
+ skb_flow_dissect_flow_keys(skb, &_flkeys, flag);
+ fl6.fl6_sport = _flkeys.ports.src;
+ fl6.fl6_dport = _flkeys.ports.dst;
+ fl6.flowi6_proto = _flkeys.basic.ip_proto;
+ flkeys = &_flkeys;
+ }
+#endif
+
if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
- fl6.mp_hash = rt6_multipath_hash(&fl6, skb);
+ fl6.mp_hash = rt6_multipath_hash(&fl6, skb, flkeys);
skb_dst_drop(skb);
skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
}
@@ -4903,6 +4929,7 @@ static int __net_init ip6_route_net_init(struct net *net)
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
net->ipv6.fib6_has_custom_rules = false;
+ net->ipv6.fib6_rules_require_fldissect = false;
net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
sizeof(*net->ipv6.ip6_prohibit_entry),
GFP_KERNEL);
--
2.1.4
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