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Message-Id: <960f8d4222f3b76555888dba4b32a8f696eeb422.1575458463.git.sd@queasysnail.net>
Date: Wed, 4 Dec 2019 15:35:53 +0100
From: Sabrina Dubroca <sd@...asysnail.net>
To: netdev@...r.kernel.org
Cc: Cong Wang <xiyou.wangcong@...il.com>, Xiumei Mu <xmu@...hat.com>,
Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net 2/2] net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup
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@...hat.com>
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
drivers/infiniband/core/addr.c | 7 +++----
drivers/infiniband/sw/rxe/rxe_net.c | 8 +++++---
drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c | 8 ++++----
drivers/net/geneve.c | 4 +++-
drivers/net/vxlan.c | 8 +++-----
include/net/ipv6_stubs.h | 6 ++++--
net/core/lwt_bpf.c | 4 +---
net/ipv6/addrconf_core.c | 11 ++++++-----
net/ipv6/af_inet6.c | 2 +-
net/mpls/af_mpls.c | 7 +++----
net/tipc/udp_media.c | 9 ++++++---
11 files changed, 39 insertions(+), 35 deletions(-)
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 6d7ec371e7b2..606fa6d86685 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -421,16 +421,15 @@ static int addr6_resolve(struct sockaddr *src_sock,
(const struct sockaddr_in6 *)dst_sock;
struct flowi6 fl6;
struct dst_entry *dst;
- 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);
if (ipv6_addr_any(&src_in->sin6_addr))
src_in->sin6_addr = fl6.saddr;
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
index 5a3474f9351b..312c2fc961c0 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -117,10 +117,12 @@ 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/ethernet/mellanox/mlx5/core/en/tc_tun.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
index 6ed87534d314..c754987278a9 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
@@ -297,10 +297,10 @@ static int mlx5e_route_lookup_ipv6(struct mlx5e_priv *priv,
int ret;
- ret = ipv6_stub->ipv6_dst_lookup(dev_net(mirred_dev), NULL, &dst,
- fl6);
- if (ret < 0)
- return ret;
+ dst = ipv6_stub->ipv6_dst_lookup_flow(dev_net(mirred_dev), NULL, fl6,
+ NULL);
+ if (IS_ERR(dst))
+ return PTR_ERR(dst);
if (!(*out_ttl))
*out_ttl = ip6_dst_hoplimit(dst);
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 3ab24fdccd3b..5c6b7fc04ea6 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -853,7 +853,9 @@ static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
if (dst)
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 bf04bc2e68c2..4c34375c2e22 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2275,7 +2275,6 @@ 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);
@@ -2298,10 +2297,9 @@ static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
fl6.fl6_dport = dport;
fl6.fl6_sport = sport;
- err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
- sock6->sock->sk,
- &ndst, &fl6);
- if (unlikely(err < 0)) {
+ ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
+ &fl6, NULL);
+ if (unlikely(IS_ERR(ndst))) {
netdev_dbg(dev, "no route to %pI6\n", daddr);
return ERR_PTR(-ENETUNREACH);
}
diff --git a/include/net/ipv6_stubs.h b/include/net/ipv6_stubs.h
index 5c93e942c50b..3e7d2c0e79ca 100644
--- a/include/net/ipv6_stubs.h
+++ b/include/net/ipv6_stubs.h
@@ -24,8 +24,10 @@ 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);
int (*ipv6_route_input)(struct sk_buff *skb);
struct fib6_table *(*fib6_get_table)(struct net *net, u32 id);
diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c
index 74cfb8b5ab33..99a6de52b21d 100644
--- a/net/core/lwt_bpf.c
+++ b/net/core/lwt_bpf.c
@@ -230,9 +230,7 @@ static int bpf_lwt_xmit_reroute(struct sk_buff *skb)
fl6.daddr = iph6->daddr;
fl6.saddr = iph6->saddr;
- err = ipv6_stub->ipv6_dst_lookup(net, skb->sk, &dst, &fl6);
- if (unlikely(err))
- goto err;
+ dst = ipv6_stub->ipv6_dst_lookup_flow(net, skb->sk, &fl6, NULL);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
goto err;
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index 2fc079284ca4..ea00ce3d4117 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -129,11 +129,12 @@ int inet6addr_validator_notifier_call_chain(unsigned long val, void *v)
}
EXPORT_SYMBOL(inet6addr_validator_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);
}
static int eafnosupport_ipv6_route_input(struct sk_buff *skb)
@@ -190,7 +191,7 @@ static int eafnosupport_ip6_del_rt(struct net *net, struct fib6_info *rt)
}
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,
.ipv6_route_input = eafnosupport_ipv6_route_input,
.fib6_get_table = eafnosupport_fib6_get_table,
.fib6_table_lookup = eafnosupport_fib6_table_lookup,
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index e84e8b1ffbc7..d727c3b41495 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -946,7 +946,7 @@ static int ipv6_route_input(struct sk_buff *skb)
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,
.ipv6_route_input = ipv6_route_input,
.fib6_get_table = fib6_get_table,
.fib6_table_lookup = fib6_table_lookup,
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index c312741df2ce..4701edffb1f7 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -617,16 +617,15 @@ 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 86aaa4d3e781..ed113735c019 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -195,10 +195,13 @@ 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;
+ }
dst_cache_set_ip6(cache, ndst, &fl6.saddr);
}
ttl = ip6_dst_hoplimit(ndst);
--
2.23.0
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