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ipv4: Kill rt->rt_{src, dst} usage in IP GRE tunnels.

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First, make callers pass on-stack flowi4 to ip_route_output_gre()
so they can get at the fully resolved flow key.

Next, use that in ipgre_tunnel_xmit() to avoid the need to use
rt->rt_{dst,src}.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2011-05-04 12:33:34 -07:00
parent 9a1b9496cd
commit cbb1e85f9c
2 changed files with 28 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
net/ipv4/ip_gre.c
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@@ -699,6 +699,7 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
struct pcpu_tstats *tstats;
const struct iphdr *old_iph = ip_hdr(skb);
const struct iphdr *tiph;
struct flowi4 fl4;
u8 tos;
__be16 df;
struct rtable *rt; /* Route to the other host */
@@ -769,7 +770,7 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph);
}
rt = ip_route_output_gre(dev_net(dev), dst, tiph->saddr,
rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr,
tunnel->parms.o_key, RT_TOS(tos),
tunnel->parms.link);
if (IS_ERR(rt)) {
@@ -873,8 +874,8 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
iph->frag_off = df;
iph->protocol = IPPROTO_GRE;
iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb);
iph->daddr = rt->rt_dst;
iph->saddr = rt->rt_src;
iph->daddr = fl4.daddr;
iph->saddr = fl4.saddr;
if ((iph->ttl = tiph->ttl) == 0) {
if (skb->protocol == htons(ETH_P_IP))
@@ -938,12 +939,14 @@ static int ipgre_tunnel_bind_dev(struct net_device *dev)
/* Guess output device to choose reasonable mtu and needed_headroom */
if (iph->daddr) {
struct rtable *rt = ip_route_output_gre(dev_net(dev),
iph->daddr, iph->saddr,
tunnel->parms.o_key,
RT_TOS(iph->tos),
tunnel->parms.link);
struct flowi4 fl4;
struct rtable *rt;
rt = ip_route_output_gre(dev_net(dev), &fl4,
iph->daddr, iph->saddr,
tunnel->parms.o_key,
RT_TOS(iph->tos),
tunnel->parms.link);
if (!IS_ERR(rt)) {
tdev = rt->dst.dev;
ip_rt_put(rt);
@@ -1196,13 +1199,15 @@ static int ipgre_open(struct net_device *dev)
struct ip_tunnel *t = netdev_priv(dev);
if (ipv4_is_multicast(t->parms.iph.daddr)) {
struct rtable *rt = ip_route_output_gre(dev_net(dev),
t->parms.iph.daddr,
t->parms.iph.saddr,
t->parms.o_key,
RT_TOS(t->parms.iph.tos),
t->parms.link);
struct flowi4 fl4;
struct rtable *rt;
rt = ip_route_output_gre(dev_net(dev), &fl4,
t->parms.iph.daddr,
t->parms.iph.saddr,
t->parms.o_key,
RT_TOS(t->parms.iph.tos),
t->parms.link);
if (IS_ERR(rt))
return -EADDRNOTAVAIL;
dev = rt->dst.dev;