--- zzzz-none-000/linux-3.10.107/net/l2tp/l2tp_ip6.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/net/l2tp/l2tp_ip6.c 2021-02-04 17:41:59.000000000 +0000 @@ -63,7 +63,7 @@ struct sock *sk; sk_for_each_bound(sk, &l2tp_ip6_bind_table) { - struct in6_addr *addr = inet6_rcv_saddr(sk); + const struct in6_addr *addr = inet6_rcv_saddr(sk); struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk); if (l2tp == NULL) @@ -133,6 +133,7 @@ unsigned char *ptr, *optr; struct l2tp_session *session; struct l2tp_tunnel *tunnel = NULL; + struct ipv6hdr *iph; int length; if (!pskb_may_pull(skb, 4)) @@ -158,14 +159,14 @@ goto discard; tunnel = session->tunnel; - if (tunnel == NULL) - goto discard; + if (!tunnel) + goto discard_sess; /* Trace packet contents, if enabled */ if (tunnel->debug & L2TP_MSG_DATA) { length = min(32u, skb->len); if (!pskb_may_pull(skb, length)) - goto discard; + goto discard_sess; /* Point to L2TP header */ optr = ptr = skb->data; @@ -176,6 +177,8 @@ l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook); + l2tp_session_dec_refcount(session); + return 0; pass_up: @@ -187,22 +190,16 @@ goto discard; tunnel_id = ntohl(*(__be32 *) &skb->data[4]); - tunnel = l2tp_tunnel_find(&init_net, tunnel_id); - if (tunnel != NULL) - sk = tunnel->sock; - else { - struct ipv6hdr *iph = ipv6_hdr(skb); - - read_lock_bh(&l2tp_ip6_lock); - sk = __l2tp_ip6_bind_lookup(&init_net, &iph->daddr, - 0, tunnel_id); - read_unlock_bh(&l2tp_ip6_lock); - } + iph = ipv6_hdr(skb); - if (sk == NULL) + read_lock_bh(&l2tp_ip6_lock); + sk = __l2tp_ip6_bind_lookup(&init_net, &iph->daddr, 0, tunnel_id); + if (!sk) { + read_unlock_bh(&l2tp_ip6_lock); goto discard; - + } sock_hold(sk); + read_unlock_bh(&l2tp_ip6_lock); if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) goto discard_put; @@ -211,6 +208,12 @@ return sk_receive_skb(sk, skb, 1); +discard_sess: + if (session->deref) + session->deref(session); + l2tp_session_dec_refcount(session); + goto discard; + discard_put: sock_put(sk); @@ -266,8 +269,6 @@ int addr_type; int err; - if (!sock_flag(sk, SOCK_ZAPPED)) - return -EINVAL; if (addr->l2tp_family != AF_INET6) return -EINVAL; if (addr_len < sizeof(*addr)) @@ -293,6 +294,9 @@ lock_sock(sk); err = -EINVAL; + if (!sock_flag(sk, SOCK_ZAPPED)) + goto out_unlock; + if (sk->sk_state != TCP_CLOSE) goto out_unlock; @@ -333,7 +337,7 @@ rcu_read_unlock(); inet->inet_rcv_saddr = inet->inet_saddr = v4addr; - np->rcv_saddr = addr->l2tp_addr; + sk->sk_v6_rcv_saddr = addr->l2tp_addr; np->saddr = addr->l2tp_addr; l2tp_ip6_sk(sk)->conn_id = addr->l2tp_conn_id; @@ -373,6 +377,9 @@ if (addr_len < sizeof(*lsa)) return -EINVAL; + if (usin->sin6_family != AF_INET6) + return -EINVAL; + addr_type = ipv6_addr_type(&usin->sin6_addr); if (addr_type & IPV6_ADDR_MULTICAST) return -EINVAL; @@ -423,14 +430,14 @@ if (!lsk->peer_conn_id) return -ENOTCONN; lsa->l2tp_conn_id = lsk->peer_conn_id; - lsa->l2tp_addr = np->daddr; + lsa->l2tp_addr = sk->sk_v6_daddr; if (np->sndflow) lsa->l2tp_flowinfo = np->flow_label; } else { - if (ipv6_addr_any(&np->rcv_saddr)) + if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) lsa->l2tp_addr = np->saddr; else - lsa->l2tp_addr = np->rcv_saddr; + lsa->l2tp_addr = sk->sk_v6_rcv_saddr; lsa->l2tp_conn_id = lsk->conn_id; } @@ -479,14 +486,13 @@ /* Userspace will call sendmsg() on the tunnel socket to send L2TP * control frames. */ -static int l2tp_ip6_sendmsg(struct kiocb *iocb, struct sock *sk, - struct msghdr *msg, size_t len) +static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) { struct ipv6_txoptions opt_space; - struct sockaddr_l2tpip6 *lsa = - (struct sockaddr_l2tpip6 *) msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name); struct in6_addr *daddr, *final_p, final; struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_txoptions *opt_to_free = NULL; struct ipv6_txoptions *opt = NULL; struct ip6_flowlabel *flowlabel = NULL; struct dst_entry *dst = NULL; @@ -530,7 +536,6 @@ flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); if (flowlabel == NULL) return -EINVAL; - daddr = &flowlabel->dst; } } @@ -539,8 +544,8 @@ * sk->sk_dst_cache. */ if (sk->sk_state == TCP_ESTABLISHED && - ipv6_addr_equal(daddr, &np->daddr)) - daddr = &np->daddr; + ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) + daddr = &sk->sk_v6_daddr; if (addr_len >= sizeof(struct sockaddr_in6) && lsa->l2tp_scope_id && @@ -550,7 +555,7 @@ if (sk->sk_state != TCP_ESTABLISHED) return -EDESTADDRREQ; - daddr = &np->daddr; + daddr = &sk->sk_v6_daddr; fl6.flowlabel = np->flow_label; } @@ -577,8 +582,10 @@ opt = NULL; } - if (opt == NULL) - opt = np->opt; + if (!opt) { + opt = txopt_get(np); + opt_to_free = opt; + } if (flowlabel) opt = fl6_merge_options(&opt_space, flowlabel, opt); opt = ipv6_fixup_options(&opt_space, opt); @@ -600,20 +607,14 @@ security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); - dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); + dst = ip6_dst_lookup_flow(sk, &fl6, final_p); if (IS_ERR(dst)) { err = PTR_ERR(dst); goto out; } - if (hlimit < 0) { - if (ipv6_addr_is_multicast(&fl6.daddr)) - hlimit = np->mcast_hops; - else - hlimit = np->hop_limit; - if (hlimit < 0) - hlimit = ip6_dst_hoplimit(dst); - } + if (hlimit < 0) + hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); if (tclass < 0) tclass = np->tclass; @@ -626,7 +627,7 @@ back_from_confirm: lock_sock(sk); - err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, + err = ip6_append_data(sk, ip_generic_getfrag, msg, ulen, transhdrlen, hlimit, tclass, opt, &fl6, (struct rt6_info *)dst, msg->msg_flags, dontfrag); @@ -639,6 +640,7 @@ dst_release(dst); out: fl6_sock_release(flowlabel); + txopt_put(opt_to_free); return err < 0 ? err : len; @@ -650,12 +652,11 @@ goto done; } -static int l2tp_ip6_recvmsg(struct kiocb *iocb, struct sock *sk, - struct msghdr *msg, size_t len, int noblock, - int flags, int *addr_len) +static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, + int noblock, int flags, int *addr_len) { struct ipv6_pinfo *np = inet6_sk(sk); - struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name); size_t copied = 0; int err = -EOPNOTSUPP; struct sk_buff *skb; @@ -679,7 +680,7 @@ copied = len; } - err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); + err = skb_copy_datagram_msg(skb, 0, msg, copied); if (err) goto done; @@ -694,7 +695,7 @@ lsa->l2tp_scope_id = 0; lsa->l2tp_conn_id = 0; if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL) - lsa->l2tp_scope_id = IP6CB(skb)->iif; + lsa->l2tp_scope_id = inet6_iif(skb); } if (np->rxopt.all) @@ -762,7 +763,6 @@ .protocol = IPPROTO_L2TP, .prot = &l2tp_ip6_prot, .ops = &l2tp_ip6_ops, - .no_check = 0, }; static struct inet6_protocol l2tp_ip6_protocol __read_mostly = { @@ -811,3 +811,4 @@ * enums */ MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP); +MODULE_ALIAS_NET_PF_PROTO(PF_INET6, IPPROTO_L2TP);