Backporting "net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup"


Pavel Machek
 

Hi!

Here's backport of `subj` to 4.19. ip6_dst_lookup_flow() prototype
changed between 4.19 and mainline, files were moved around, and I
could not find some instances to update. Fun!

I did minimal compile testing, I'll need to run it behind gitlab ci;
but... if you are using IPv6 and can test this, it would be nice.

Best regards,
Pavel



diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 46b855a42884..e3c948617c73 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -415,9 +415,9 @@ static int addr6_resolve(struct sockaddr_in6 *src_in,
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)) {
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
index 8094cbaa54a9..95cf4fd69c55 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -154,10 +154,12 @@ 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 493cd382b8aa..f22f187a91cd 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -796,7 +796,9 @@ 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 27bd586b94b0..0b6e899bd02e 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1952,7 +1952,6 @@ 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);
@@ -1975,10 +1974,9 @@ 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/addrconf.h b/include/net/addrconf.h
index 6def0351bcc3..ceb36cce91ee 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -235,9 +235,10 @@ 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);
struct fib6_table *(*fib6_get_table)(struct net *net, u32 id);
struct fib6_info *(*fib6_lookup)(struct net *net, int oif,
struct flowi6 *fl6, int flags);
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index ff33f498c137..035cd7dc3836 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -961,6 +961,13 @@ int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
struct flowi6 *fl6);
struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
const struct in6_addr *final_dst);
+
+static inline struct dst_entry *ip6_dst_lookup_flow_net(struct net *ign, const struct sock *sk, struct flowi6 *fl6,
+ const struct in6_addr *final_dst)
+{
+ return ip6_dst_lookup_flow(sk, fl6, final_dst);
+}
+
struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
const struct in6_addr *final_dst,
bool connected);
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index 5cd0029d930e..fe7f59193bb1 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -127,11 +127,12 @@ 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 struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id)
@@ -169,7 +170,7 @@ eafnosupport_ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
}

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,
.fib6_get_table = eafnosupport_fib6_get_table,
.fib6_table_lookup = eafnosupport_fib6_table_lookup,
.fib6_lookup = eafnosupport_fib6_lookup,
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 9a4261e50272..e44534f22e00 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -889,7 +889,7 @@ 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_net,
.fib6_get_table = fib6_get_table,
.fib6_table_lookup = fib6_table_lookup,
.fib6_lookup = fib6_lookup,
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 8fbe6cdbe255..e42ef8f835fa 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -618,16 +618,15 @@ 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 9783101bc4a9..1ab684a4f565 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -190,6 +190,14 @@ static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
.saddr = src->ipv6,
.flowi6_proto = IPPROTO_UDP
};
+ ndst = ipv6_stub->ipv6_dst_lookup_flow(net,
+ ub->ubsock->sk,
+ &fl6, NULL);
+ if (IS_ERR(ndst)) {
+ err = PTR_ERR(ndst);
+ goto tx_error;
+ }
+
err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,
&fl6);
if (err)

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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