[PATCH 4.9 28/90] net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup

From: Greg Kroah-Hartman
Date: Mon May 18 2020 - 13:44:48 EST

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From: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>

commit 6c8991f41546c3c472503dff1ea9daaddf9331c2 upstream.

ipv6_stub uses the ip6_dst_lookup function to allow other modules to
perform IPv6 lookups. However, this function skips the XFRM layer
entirely.

All users of ipv6_stub->ip6_dst_lookup use ip_route_output_flow (via the
ip_route_output_key and ip_route_output helpers) for their IPv4 lookups,
which calls xfrm_lookup_route(). This patch fixes this inconsistent
behavior by switching the stub to ip6_dst_lookup_flow, which also calls
xfrm_lookup_route().

This requires some changes in all the callers, as these two functions
take different arguments and have different return types.

Fixes: 5f81bd2e5d80 ("ipv6: export a stub for IPv6 symbols used by vxlan")
Reported-by: Xiumei Mu <xmu@xxxxxxxxxx>
Signed-off-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[bwh: Backported to 4.9:
- Drop changes in lwt_bpf.c and mlx5
- Initialise "dst" in drivers/infiniband/core/addr.c:addr_resolve()
to avoid introducing a spurious "may be used uninitialised" warning
- Adjust filename, context, indentation]
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/infiniband/core/addr.c | 8 ++++----
drivers/infiniband/sw/rxe/rxe_net.c | 8 +++++---
drivers/net/geneve.c | 4 +++-
drivers/net/vxlan.c | 10 ++++------
include/net/addrconf.h | 6 ++++--
net/ipv6/addrconf_core.c | 11 ++++++-----
net/ipv6/af_inet6.c | 2 +-
net/mpls/af_mpls.c | 7 +++----
net/tipc/udp_media.c | 9 ++++++---
9 files changed, 36 insertions(+), 29 deletions(-)

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index f7d23c1081dc4..68eed45b86003 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -453,16 +453,15 @@ static int addr6_resolve(struct sockaddr_in6 *src_in,
struct flowi6 fl6;
struct dst_entry *dst;
struct rt6_info *rt;
- int ret;

memset(&fl6, 0, sizeof fl6);
fl6.daddr = dst_in->sin6_addr;
fl6.saddr = src_in->sin6_addr;
fl6.flowi6_oif = addr->bound_dev_if;

- ret = ipv6_stub->ipv6_dst_lookup(addr->net, NULL, &dst, &fl6);
- if (ret < 0)
- return ret;
+ dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
+ if (IS_ERR(dst))
+ return PTR_ERR(dst);

rt = (struct rt6_info *)dst;
if (ipv6_addr_any(&src_in->sin6_addr)) {
@@ -552,6 +551,7 @@ static int addr_resolve(struct sockaddr *src_in,
const struct sockaddr_in6 *dst_in6 =
(const struct sockaddr_in6 *)dst_in;

+ dst = NULL;
ret = addr6_resolve((struct sockaddr_in6 *)src_in,
dst_in6, addr,
&dst);
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
index f4f3942ebbd13..d19e003e8381e 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -182,10 +182,12 @@ static struct dst_entry *rxe_find_route6(struct net_device *ndev,
memcpy(&fl6.daddr, daddr, sizeof(*daddr));
fl6.flowi6_proto = IPPROTO_UDP;

- if (unlikely(ipv6_stub->ipv6_dst_lookup(sock_net(recv_sockets.sk6->sk),
- recv_sockets.sk6->sk, &ndst, &fl6))) {
+ ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
+ recv_sockets.sk6->sk, &fl6,
+ NULL);
+ if (unlikely(IS_ERR(ndst))) {
pr_err_ratelimited("no route to %pI6\n", daddr);
- goto put;
+ return NULL;
}

if (unlikely(ndst->error)) {
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 92ad43e53c722..35d8c636de123 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -835,7 +835,9 @@ static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
return dst;
}

- if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
+ dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
+ NULL);
+ if (IS_ERR(dst)) {
netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
return ERR_PTR(-ENETUNREACH);
}
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index bc4542d9a08d3..58ddb6c904185 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1881,7 +1881,6 @@ static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
struct dst_entry *ndst;
struct flowi6 fl6;
- int err;

if (!sock6)
return ERR_PTR(-EIO);
@@ -1902,11 +1901,10 @@ static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
fl6.flowi6_mark = skb->mark;
fl6.flowi6_proto = IPPROTO_UDP;

- err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
- sock6->sock->sk,
- &ndst, &fl6);
- if (err < 0)
- return ERR_PTR(err);
+ ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
+ &fl6, NULL);
+ if (unlikely(IS_ERR(ndst)))
+ return ERR_PTR(-ENETUNREACH);

*saddr = fl6.saddr;
if (use_cache)
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index b8ee8a113e324..019b06c035a84 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -206,8 +206,10 @@ struct ipv6_stub {
const struct in6_addr *addr);
int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
const struct in6_addr *addr);
- int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
- struct dst_entry **dst, struct flowi6 *fl6);
+ struct dst_entry *(*ipv6_dst_lookup_flow)(struct net *net,
+ const struct sock *sk,
+ struct flowi6 *fl6,
+ const struct in6_addr *final_dst);
void (*udpv6_encap_enable)(void);
void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
const struct in6_addr *solicited_addr,
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index bfa941fc11650..129324b36fb60 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -107,15 +107,16 @@ int inet6addr_notifier_call_chain(unsigned long val, void *v)
}
EXPORT_SYMBOL(inet6addr_notifier_call_chain);

-static int eafnosupport_ipv6_dst_lookup(struct net *net, struct sock *u1,
- struct dst_entry **u2,
- struct flowi6 *u3)
+static struct dst_entry *eafnosupport_ipv6_dst_lookup_flow(struct net *net,
+ const struct sock *sk,
+ struct flowi6 *fl6,
+ const struct in6_addr *final_dst)
{
- return -EAFNOSUPPORT;
+ return ERR_PTR(-EAFNOSUPPORT);
}

const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
- .ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup,
+ .ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow,
};
EXPORT_SYMBOL_GPL(ipv6_stub);

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 2e91637c9d491..c6746aaf7fbfb 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -860,7 +860,7 @@ static struct pernet_operations inet6_net_ops = {
static const struct ipv6_stub ipv6_stub_impl = {
.ipv6_sock_mc_join = ipv6_sock_mc_join,
.ipv6_sock_mc_drop = ipv6_sock_mc_drop,
- .ipv6_dst_lookup = ip6_dst_lookup,
+ .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
.udpv6_encap_enable = udpv6_encap_enable,
.ndisc_send_na = ndisc_send_na,
.nd_tbl = &nd_tbl,
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index ffab94d61e1da..eab9c1d70856b 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -497,16 +497,15 @@ static struct net_device *inet6_fib_lookup_dev(struct net *net,
struct net_device *dev;
struct dst_entry *dst;
struct flowi6 fl6;
- int err;

if (!ipv6_stub)
return ERR_PTR(-EAFNOSUPPORT);

memset(&fl6, 0, sizeof(fl6));
memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
- err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6);
- if (err)
- return ERR_PTR(err);
+ dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL);
+ if (IS_ERR(dst))
+ return ERR_CAST(dst);

dev = dst->dev;
dev_hold(dev);
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index 05033ab05b8f3..c6ff3de1de37b 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -187,10 +187,13 @@ static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
.saddr = src->ipv6,
.flowi6_proto = IPPROTO_UDP
};
- err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,
- &fl6);
- if (err)
+ ndst = ipv6_stub->ipv6_dst_lookup_flow(net,
+ ub->ubsock->sk,
+ &fl6, NULL);
+ if (IS_ERR(ndst)) {
+ err = PTR_ERR(ndst);
goto tx_error;
+ }
ttl = ip6_dst_hoplimit(ndst);
err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL,
&src->ipv6, &dst->ipv6, 0, ttl, 0,
--
2.20.1

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