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ipv4: Make rt->fl.iif tests lest obscure. 

When we test rt->fl.iif against zero, we're seeing if it's
an output or an input route.

Make that explicit with some helper functions.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2010-11-11 17:07:48 -08:00
parent ed1deb7021
commit c753796769
9 changed files with 42 additions and 20 deletions
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10
include/net/dn_route.h
View File

@ -80,6 +80,16 @@ struct dn_route {
unsigned rt_type;
};
static inline bool dn_is_input_route(struct dn_route *rt)
{
return rt->fl.iif != 0;
}
static inline bool dn_is_output_route(struct dn_route *rt)
{
return rt->fl.iif == 0;
}
extern void dn_route_init(void);
extern void dn_route_cleanup(void);

10
include/net/route.h
View File

@ -71,6 +71,16 @@ struct rtable {
struct inet_peer *peer; /* long-living peer info */
};
static inline bool rt_is_input_route(struct rtable *rt)
{
return rt->fl.iif != 0;
}
static inline bool rt_is_output_route(struct rtable *rt)
{
return rt->fl.iif == 0;
}
struct ip_rt_acct {
__u32 o_bytes;
__u32 o_packets;

4
net/decnet/dn_route.c
View File

@ -1181,7 +1181,7 @@ static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *fl
if ((flp->fld_dst == rt->fl.fld_dst) &&
(flp->fld_src == rt->fl.fld_src) &&
(flp->mark == rt->fl.mark) &&
(rt->fl.iif == 0) &&
dn_is_output_route(rt) &&
(rt->fl.oif == flp->oif)) {
dst_use(&rt->dst, jiffies);
rcu_read_unlock_bh();
@ -1512,7 +1512,7 @@ static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, expires,
rt->dst.error) < 0)
goto rtattr_failure;
if (rt->fl.iif)
if (dn_is_input_route(rt))
RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
nlh->nlmsg_len = skb_tail_pointer(skb) - b;

4
net/ipv4/icmp.c
View File

@ -506,8 +506,8 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
struct net_device *dev = NULL;
rcu_read_lock();
if (rt->fl.iif &&
net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr)
if (rt_is_input_route(rt) &&
net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr)
dev = dev_get_by_index_rcu(net, rt->fl.iif);
if (dev)

2
net/ipv4/igmp.c
View File

@ -961,7 +961,7 @@ int igmp_rcv(struct sk_buff *skb)
case IGMP_HOST_MEMBERSHIP_REPORT:
case IGMPV2_HOST_MEMBERSHIP_REPORT:
/* Is it our report looped back? */
if (skb_rtable(skb)->fl.iif == 0)
if (rt_is_output_route(skb_rtable(skb)))
break;
/* don't rely on MC router hearing unicast reports */
if (skb->pkt_type == PACKET_MULTICAST ||

2
net/ipv4/ip_gre.c
View File

@ -634,7 +634,7 @@ static int ipgre_rcv(struct sk_buff *skb)
#ifdef CONFIG_NET_IPGRE_BROADCAST
if (ipv4_is_multicast(iph->daddr)) {
/* Looped back packet, drop it! */
if (skb_rtable(skb)->fl.iif == 0)
if (rt_is_output_route(skb_rtable(skb)))
goto drop;
tunnel->dev->stats.multicast++;
skb->pkt_type = PACKET_BROADCAST;

2
net/ipv4/ipmr.c
View File

@ -1654,7 +1654,7 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
if (mrt->vif_table[vif].dev != skb->dev) {
int true_vifi;
if (skb_rtable(skb)->fl.iif == 0) {
if (rt_is_output_route(skb_rtable(skb))) {
/* It is our own packet, looped back.
* Very complicated situation...
*

20
net/ipv4/route.c
View File

@ -623,7 +623,7 @@ static inline int rt_fast_clean(struct rtable *rth)
/* Kill broadcast/multicast entries very aggresively, if they
collide in hash table with more useful entries */
return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
rth->fl.iif && rth->dst.rt_next;
rt_is_input_route(rth) && rth->dst.rt_next;
}
static inline int rt_valuable(struct rtable *rth)
@ -668,7 +668,7 @@ static inline u32 rt_score(struct rtable *rt)
if (rt_valuable(rt))
score |= (1<<31);
if (!rt->fl.iif ||
if (rt_is_output_route(rt) ||
!(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL)))
score |= (1<<30);
@ -1126,7 +1126,7 @@ restart:
*/
rt->dst.flags |= DST_NOCACHE;
if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) {
if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
int err = arp_bind_neighbour(&rt->dst);
if (err) {
if (net_ratelimit())
@ -1224,7 +1224,7 @@ restart:
/* Try to bind route to arp only if it is output
route or unicast forwarding path.
*/
if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) {
if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
int err = arp_bind_neighbour(&rt->dst);
if (err) {
spin_unlock_bh(rt_hash_lock_addr(hash));
@ -1406,7 +1406,7 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
if (rth->fl.fl4_dst != daddr ||
rth->fl.fl4_src != skeys[i] ||
rth->fl.oif != ikeys[k] ||
rth->fl.iif != 0 ||
rt_is_input_route(rth) ||
rt_is_expired(rth) ||
!net_eq(dev_net(rth->dst.dev), net)) {
rthp = &rth->dst.rt_next;
@ -1666,7 +1666,7 @@ unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
rth->rt_dst != daddr ||
rth->rt_src != iph->saddr ||
rth->fl.oif != ikeys[k] ||
rth->fl.iif != 0 ||
rt_is_input_route(rth) ||
dst_metric_locked(&rth->dst, RTAX_MTU) ||
!net_eq(dev_net(rth->dst.dev), net) ||
rt_is_expired(rth))
@ -1770,7 +1770,7 @@ void ip_rt_get_source(u8 *addr, struct rtable *rt)
__be32 src;
struct fib_result res;
if (rt->fl.iif == 0)
if (rt_is_output_route(rt))
src = rt->rt_src;
else {
rcu_read_lock();
@ -2669,7 +2669,7 @@ int __ip_route_output_key(struct net *net, struct rtable **rp,
rth = rcu_dereference_bh(rth->dst.rt_next)) {
if (rth->fl.fl4_dst == flp->fl4_dst &&
rth->fl.fl4_src == flp->fl4_src &&
rth->fl.iif == 0 &&
rt_is_output_route(rth) &&
rth->fl.oif == flp->oif &&
rth->fl.mark == flp->mark &&
!((rth->fl.fl4_tos ^ flp->fl4_tos) &
@ -2824,7 +2824,7 @@ static int rt_fill_info(struct net *net,
if (rt->dst.tclassid)
NLA_PUT_U32(skb, RTA_FLOW, rt->dst.tclassid);
#endif
if (rt->fl.iif)
if (rt_is_input_route(rt))
NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst);
else if (rt->rt_src != rt->fl.fl4_src)
NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src);
@ -2849,7 +2849,7 @@ static int rt_fill_info(struct net *net,
}
}
if (rt->fl.iif) {
if (rt_is_input_route(rt)) {
#ifdef CONFIG_IP_MROUTE
__be32 dst = rt->rt_dst;

8
net/netfilter/ipvs/ip_vs_xmit.c
View File

@ -169,7 +169,7 @@ __ip_vs_reroute_locally(struct sk_buff *skb)
struct net *net = dev_net(dev);
struct iphdr *iph = ip_hdr(skb);
if (rt->fl.iif) {
if (rt_is_input_route(rt)) {
unsigned long orefdst = skb->_skb_refdst;
if (ip_route_input(skb, iph->daddr, iph->saddr,
@ -552,7 +552,8 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
#endif
/* From world but DNAT to loopback address? */
if (local && ipv4_is_loopback(rt->rt_dst) && skb_rtable(skb)->fl.iif) {
if (local && ipv4_is_loopback(rt->rt_dst) &&
rt_is_input_route(skb_rtable(skb))) {
IP_VS_DBG_RL_PKT(1, AF_INET, pp, skb, 0, "ip_vs_nat_xmit(): "
"stopping DNAT to loopback address");
goto tx_error_put;
@ -1165,7 +1166,8 @@ ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
#endif
/* From world but DNAT to loopback address? */
if (local && ipv4_is_loopback(rt->rt_dst) && skb_rtable(skb)->fl.iif) {
if (local && ipv4_is_loopback(rt->rt_dst) &&
rt_is_input_route(skb_rtable(skb))) {
IP_VS_DBG(1, "%s(): "
"stopping DNAT to loopback %pI4\n",
__func__, &cp->daddr.ip);