From: Roopa Prabhu Date: Thu, 1 Mar 2018 03:42:41 +0000 (-0500) Subject: ipv6: route: dissect flow in input path if fib rules need it X-Git-Tag: v4.19~1326^2~328^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e37b1e978bec5334dc379d8c2423d063af207430;p=platform%2Fkernel%2Flinux-rpi.git ipv6: route: dissect flow in input path if fib rules need it 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 (Thanks to Nikolay Aleksandrov for some review here). Signed-off-by: Roopa Prabhu Acked-by: Paolo Abeni Acked-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h index 15e19c5..8812582 100644 --- a/include/net/ip_fib.h +++ b/include/net/ip_fib.h @@ -293,6 +293,13 @@ static inline unsigned int fib4_rules_seq_read(struct net *net) return 0; } +static inline bool fib4_rules_early_flow_dissect(struct net *net, + struct sk_buff *skb, + struct flowi4 *fl4, + struct flow_keys *flkeys) +{ + return false; +} #else /* CONFIG_IP_MULTIPLE_TABLES */ int __net_init fib4_rules_init(struct net *net); void __net_exit fib4_rules_exit(struct net *net); @@ -341,6 +348,24 @@ bool fib4_rule_default(const struct fib_rule *rule); int fib4_rules_dump(struct net *net, struct notifier_block *nb); unsigned int fib4_rules_seq_read(struct net *net); +static inline bool fib4_rules_early_flow_dissect(struct net *net, + struct sk_buff *skb, + struct flowi4 *fl4, + struct flow_keys *flkeys) +{ + unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; + + if (!net->ipv4.fib_rules_require_fldissect) + return false; + + skb_flow_dissect_flow_keys(skb, flkeys, flag); + fl4->fl4_sport = flkeys->ports.src; + fl4->fl4_dport = flkeys->ports.dst; + fl4->flowi4_proto = flkeys->basic.ip_proto; + + return true; +} + #endif /* CONFIG_IP_MULTIPLE_TABLES */ /* Exported by fib_frontend.c */ @@ -371,7 +396,7 @@ int fib_sync_up(struct net_device *dev, unsigned int nh_flags); #ifdef CONFIG_IP_ROUTE_MULTIPATH int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, - const struct sk_buff *skb); + const struct sk_buff *skb, struct flow_keys *flkeys); #endif void fib_select_multipath(struct fib_result *res, int hash); void fib_select_path(struct net *net, struct fib_result *res, diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h index 44668c2..3a970e4 100644 --- a/include/net/netns/ipv4.h +++ b/include/net/netns/ipv4.h @@ -52,6 +52,7 @@ struct netns_ipv4 { #ifdef CONFIG_IP_MULTIPLE_TABLES struct fib_rules_ops *rules_ops; bool fib_has_custom_rules; + unsigned int fib_rules_require_fldissect; struct fib_table __rcu *fib_main; struct fib_table __rcu *fib_default; #endif diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c index 16083b8..737d11b 100644 --- a/net/ipv4/fib_rules.c +++ b/net/ipv4/fib_rules.c @@ -255,6 +255,9 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb, } #endif + if (fib_rule_requires_fldissect(rule)) + net->ipv4.fib_rules_require_fldissect++; + rule4->src_len = frh->src_len; rule4->srcmask = inet_make_mask(rule4->src_len); rule4->dst_len = frh->dst_len; @@ -283,6 +286,10 @@ static int fib4_rule_delete(struct fib_rule *rule) net->ipv4.fib_num_tclassid_users--; #endif net->ipv4.fib_has_custom_rules = true; + + if (net->ipv4.fib_rules_require_fldissect && + fib_rule_requires_fldissect(rule)) + net->ipv4.fib_rules_require_fldissect--; errout: return err; } @@ -400,6 +407,7 @@ int __net_init fib4_rules_init(struct net *net) goto fail; net->ipv4.rules_ops = ops; net->ipv4.fib_has_custom_rules = false; + net->ipv4.fib_rules_require_fldissect = 0; return 0; fail: diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index f31e657..181b0d8 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -1770,7 +1770,7 @@ void fib_select_path(struct net *net, struct fib_result *res, #ifdef CONFIG_IP_ROUTE_MULTIPATH if (res->fi->fib_nhs > 1) { - int h = fib_multipath_hash(res->fi, fl4, skb); + int h = fib_multipath_hash(res->fi, fl4, skb, NULL); fib_select_multipath(res, h); } diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 26eefa2..3bb686d 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1783,7 +1783,7 @@ static void ip_multipath_l3_keys(const struct sk_buff *skb, /* if skb is set it will be used and fl4 can be NULL */ int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, - const struct sk_buff *skb) + const struct sk_buff *skb, struct flow_keys *flkeys) { struct net *net = fi->fib_net; struct flow_keys hash_keys; @@ -1810,14 +1810,23 @@ int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, if (skb->l4_hash) return skb_get_hash_raw(skb) >> 1; memset(&hash_keys, 0, sizeof(hash_keys)); - skb_flow_dissect_flow_keys(skb, &keys, flag); - hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; - hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; - hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; - hash_keys.ports.src = keys.ports.src; - hash_keys.ports.dst = keys.ports.dst; - hash_keys.basic.ip_proto = keys.basic.ip_proto; + if (flkeys) { + hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; + hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; + hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; + hash_keys.ports.src = flkeys->ports.src; + hash_keys.ports.dst = flkeys->ports.dst; + hash_keys.basic.ip_proto = flkeys->basic.ip_proto; + } else { + skb_flow_dissect_flow_keys(skb, &keys, flag); + hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; + hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; + hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; + hash_keys.ports.src = keys.ports.src; + hash_keys.ports.dst = keys.ports.dst; + hash_keys.basic.ip_proto = keys.basic.ip_proto; + } } else { memset(&hash_keys, 0, sizeof(hash_keys)); hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; @@ -1838,11 +1847,12 @@ int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, static int ip_mkroute_input(struct sk_buff *skb, struct fib_result *res, struct in_device *in_dev, - __be32 daddr, __be32 saddr, u32 tos) + __be32 daddr, __be32 saddr, u32 tos, + struct flow_keys *hkeys) { #ifdef CONFIG_IP_ROUTE_MULTIPATH if (res->fi && res->fi->fib_nhs > 1) { - int h = fib_multipath_hash(res->fi, NULL, skb); + int h = fib_multipath_hash(res->fi, NULL, skb, hkeys); fib_select_multipath(res, h); } @@ -1868,13 +1878,14 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, struct fib_result *res) { struct in_device *in_dev = __in_dev_get_rcu(dev); + struct flow_keys *flkeys = NULL, _flkeys; + struct net *net = dev_net(dev); struct ip_tunnel_info *tun_info; - struct flowi4 fl4; + int err = -EINVAL; unsigned int flags = 0; u32 itag = 0; struct rtable *rth; - int err = -EINVAL; - struct net *net = dev_net(dev); + struct flowi4 fl4; bool do_cache; /* IP on this device is disabled. */ @@ -1933,6 +1944,10 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, fl4.daddr = daddr; fl4.saddr = saddr; fl4.flowi4_uid = sock_net_uid(net, NULL); + + if (fib4_rules_early_flow_dissect(net, skb, &fl4, &_flkeys)) + flkeys = &_flkeys; + err = fib_lookup(net, &fl4, res, 0); if (err != 0) { if (!IN_DEV_FORWARD(in_dev)) @@ -1958,7 +1973,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, if (res->type != RTN_UNICAST) goto martian_destination; - err = ip_mkroute_input(skb, res, in_dev, daddr, saddr, tos); + err = ip_mkroute_input(skb, res, in_dev, daddr, saddr, tos, flkeys); out: return err; brd_input: