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net: Add source address lookup op for VRF 

Add operation to l3mdev to lookup source address for a given flow.
Add support for the operation to VRF driver and convert existing
IPv4 hooks to use the new lookup.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2015-10-05 08:51:26 -07:00 committed by David S. Miller
parent 3ce58d8435
commit 8cbb512c92
4 changed files with 69 additions and 22 deletions
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35
drivers/net/vrf.c
View File

@ -36,6 +36,9 @@
#include <net/addrconf.h>
#include <net/l3mdev.h>
#define RT_FL_TOS(oldflp4) \
((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
#define DRV_NAME "vrf"
#define DRV_VERSION "1.0"
@ -553,9 +556,41 @@ static struct rtable *vrf_get_rtable(const struct net_device *dev,
return rth;
}
/* called under rcu_read_lock */
static void vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
{
struct fib_result res = { .tclassid = 0 };
struct net *net = dev_net(dev);
u32 orig_tos = fl4->flowi4_tos;
u8 flags = fl4->flowi4_flags;
u8 scope = fl4->flowi4_scope;
u8 tos = RT_FL_TOS(fl4);
if (unlikely(!fl4->daddr))
return;
fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF;
fl4->flowi4_iif = LOOPBACK_IFINDEX;
fl4->flowi4_tos = tos & IPTOS_RT_MASK;
fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
if (!fib_lookup(net, fl4, &res, 0)) {
if (res.type == RTN_LOCAL)
fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr;
else
fib_select_path(net, &res, fl4, -1);
}
fl4->flowi4_flags = flags;
fl4->flowi4_tos = orig_tos;
fl4->flowi4_scope = scope;
}
static const struct l3mdev_ops vrf_l3mdev_ops = {
.l3mdev_fib_table = vrf_fib_table,
.l3mdev_get_rtable = vrf_get_rtable,
.l3mdev_get_saddr = vrf_get_saddr,
};
static void vrf_get_drvinfo(struct net_device *dev,

27
include/net/l3mdev.h
View File

@ -17,12 +17,16 @@
* @l3mdev_fib_table: Get FIB table id to use for lookups
*
* @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
*
* @l3mdev_get_saddr: Get source address for a flow
*/
struct l3mdev_ops {
u32 (*l3mdev_fib_table)(const struct net_device *dev);
struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
const struct flowi4 *fl4);
void (*l3mdev_get_saddr)(struct net_device *dev,
struct flowi4 *fl4);
};
#ifdef CONFIG_NET_L3_MASTER_DEV
@ -100,6 +104,25 @@ static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
return rc;
}
static inline void l3mdev_get_saddr(struct net *net, int ifindex,
struct flowi4 *fl4)
{
struct net_device *dev;
if (ifindex) {
rcu_read_lock();
dev = dev_get_by_index_rcu(net, ifindex);
if (dev && netif_is_l3_master(dev) &&
dev->l3mdev_ops->l3mdev_get_saddr) {
dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
}
rcu_read_unlock();
}
}
#else
static inline int l3mdev_master_ifindex_rcu(struct net_device *dev)
@ -144,6 +167,10 @@ static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
return false;
}
static inline void l3mdev_get_saddr(struct net *net, int ifindex,
struct flowi4 *fl4)
{
}
#endif
#endif /* _NET_L3MDEV_H_ */

7
include/net/route.h
View File

@ -266,9 +266,6 @@ static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32
if (inet_sk(sk)->transparent)
flow_flags |= FLOWI_FLAG_ANYSRC;
if (netif_index_is_l3_master(sock_net(sk), oif))
flow_flags |= FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF;
flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
protocol, flow_flags, dst, src, dport, sport);
}
@ -285,6 +282,10 @@ static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
sport, dport, sk);
if (!src && oif) {
l3mdev_get_saddr(net, oif, fl4);
src = fl4->saddr;
}
if (!dst || !src) {
rt = __ip_route_output_key(net, fl4);
if (IS_ERR(rt))

22
net/ipv4/udp.c
View File

@ -1017,30 +1017,14 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
fl4 = &fl4_stack;
/* unconnected socket. If output device is enslaved to a VRF
* device lookup source address from VRF table. This mimics
* behavior of ip_route_connect{_init}.
*/
if (netif_index_is_l3_master(net, ipc.oif)) {
flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
RT_SCOPE_UNIVERSE, sk->sk_protocol,
(flow_flags | FLOWI_FLAG_L3MDEV_SRC |
FLOWI_FLAG_SKIP_NH_OIF),
faddr, saddr, dport,
inet->inet_sport);
rt = ip_route_output_flow(net, fl4, sk);
if (!IS_ERR(rt)) {
saddr = fl4->saddr;
ip_rt_put(rt);
}
}
flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
RT_SCOPE_UNIVERSE, sk->sk_protocol,
flow_flags,
faddr, saddr, dport, inet->inet_sport);
if (!saddr && ipc.oif)
l3mdev_get_saddr(net, ipc.oif, fl4);
security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
rt = ip_route_output_flow(net, fl4, sk);
if (IS_ERR(rt)) {