@@ -3178,8 +3178,50 @@ static struct ipv6_pinfo *mptcp_inet6_sk(const struct sock *sk)
return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
}
+
+static void mptcp_copy_ip6_options(struct sock *newsk, const struct sock *sk)
+{
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_txoptions *opt;
+ struct ipv6_pinfo *newnp;
+
+ newnp = inet6_sk(newsk);
+
+ rcu_read_lock();
+ opt = rcu_dereference(np->opt);
+ if (opt) {
+ opt = ipv6_dup_options(newsk, opt);
+ if (!opt)
+ net_warn_ratelimited("%s: Failed to copy ip6 options\n", __func__);
+ }
+ RCU_INIT_POINTER(newnp->opt, opt);
+ rcu_read_unlock();
+}
#endif
+static void mptcp_copy_ip_options(struct sock *newsk, const struct sock *sk)
+{
+ struct ip_options_rcu *inet_opt, *newopt = NULL;
+ const struct inet_sock *inet = inet_sk(sk);
+ struct inet_sock *newinet;
+
+ newinet = inet_sk(newsk);
+
+ rcu_read_lock();
+ inet_opt = rcu_dereference(inet->inet_opt);
+ if (inet_opt) {
+ newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
+ inet_opt->opt.optlen, GFP_ATOMIC);
+ if (newopt)
+ memcpy(newopt, inet_opt, sizeof(*inet_opt) +
+ inet_opt->opt.optlen);
+ else
+ net_warn_ratelimited("%s: Failed to copy ip options\n", __func__);
+ }
+ RCU_INIT_POINTER(newinet->inet_opt, newopt);
+ rcu_read_unlock();
+}
+
struct sock *mptcp_sk_clone_init(const struct sock *sk,
const struct mptcp_options_received *mp_opt,
struct sock *ssk,
@@ -3200,6 +3242,13 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk,
__mptcp_init_sock(nsk);
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ if (nsk->sk_family == AF_INET6)
+ mptcp_copy_ip6_options(nsk, sk);
+ else
+#endif
+ mptcp_copy_ip_options(nsk, sk);
+
msk = mptcp_sk(nsk);
msk->local_key = subflow_req->local_key;
msk->token = subflow_req->token;