2285 строки
59 KiB
C
2285 строки
59 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* TCP over IPv6
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* Based on:
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* linux/net/ipv4/tcp.c
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* linux/net/ipv4/tcp_input.c
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* linux/net/ipv4/tcp_output.c
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*
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* Fixes:
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* Hideaki YOSHIFUJI : sin6_scope_id support
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* YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
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* Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
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* a single port at the same time.
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* YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
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*/
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#include <linux/bottom_half.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/jiffies.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/netdevice.h>
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#include <linux/init.h>
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#include <linux/jhash.h>
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#include <linux/ipsec.h>
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#include <linux/times.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/ipv6.h>
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#include <linux/icmpv6.h>
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#include <linux/random.h>
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#include <linux/indirect_call_wrapper.h>
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#include <net/tcp.h>
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#include <net/ndisc.h>
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#include <net/inet6_hashtables.h>
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#include <net/inet6_connection_sock.h>
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#include <net/ipv6.h>
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#include <net/transp_v6.h>
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#include <net/addrconf.h>
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#include <net/ip6_route.h>
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#include <net/ip6_checksum.h>
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#include <net/inet_ecn.h>
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#include <net/protocol.h>
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#include <net/xfrm.h>
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#include <net/snmp.h>
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#include <net/dsfield.h>
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#include <net/timewait_sock.h>
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#include <net/inet_common.h>
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#include <net/secure_seq.h>
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#include <net/busy_poll.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <crypto/hash.h>
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#include <linux/scatterlist.h>
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#include <trace/events/tcp.h>
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static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb);
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static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
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struct request_sock *req);
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INDIRECT_CALLABLE_SCOPE int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
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static const struct inet_connection_sock_af_ops ipv6_mapped;
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const struct inet_connection_sock_af_ops ipv6_specific;
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#ifdef CONFIG_TCP_MD5SIG
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static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
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static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
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#else
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static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
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const struct in6_addr *addr,
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int l3index)
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{
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return NULL;
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}
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#endif
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/* Helper returning the inet6 address from a given tcp socket.
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* It can be used in TCP stack instead of inet6_sk(sk).
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* This avoids a dereference and allow compiler optimizations.
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* It is a specialized version of inet6_sk_generic().
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*/
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static struct ipv6_pinfo *tcp_inet6_sk(const struct sock *sk)
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{
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unsigned int offset = sizeof(struct tcp6_sock) - sizeof(struct ipv6_pinfo);
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return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
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}
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static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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if (dst && dst_hold_safe(dst)) {
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const struct rt6_info *rt = (const struct rt6_info *)dst;
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rcu_assign_pointer(sk->sk_rx_dst, dst);
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sk->sk_rx_dst_ifindex = skb->skb_iif;
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sk->sk_rx_dst_cookie = rt6_get_cookie(rt);
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}
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}
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static u32 tcp_v6_init_seq(const struct sk_buff *skb)
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{
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return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32,
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ipv6_hdr(skb)->saddr.s6_addr32,
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tcp_hdr(skb)->dest,
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tcp_hdr(skb)->source);
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}
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static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb)
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{
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return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32,
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ipv6_hdr(skb)->saddr.s6_addr32);
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}
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static int tcp_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
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int addr_len)
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{
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/* This check is replicated from tcp_v6_connect() and intended to
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* prevent BPF program called below from accessing bytes that are out
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* of the bound specified by user in addr_len.
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*/
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if (addr_len < SIN6_LEN_RFC2133)
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return -EINVAL;
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sock_owned_by_me(sk);
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return BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr);
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}
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static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
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int addr_len)
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{
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struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct in6_addr *saddr = NULL, *final_p, final;
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struct inet_timewait_death_row *tcp_death_row;
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struct ipv6_pinfo *np = tcp_inet6_sk(sk);
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struct inet_sock *inet = inet_sk(sk);
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struct tcp_sock *tp = tcp_sk(sk);
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struct net *net = sock_net(sk);
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struct ipv6_txoptions *opt;
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struct dst_entry *dst;
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struct flowi6 fl6;
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int addr_type;
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int err;
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if (addr_len < SIN6_LEN_RFC2133)
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return -EINVAL;
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if (usin->sin6_family != AF_INET6)
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return -EAFNOSUPPORT;
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memset(&fl6, 0, sizeof(fl6));
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if (np->sndflow) {
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fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
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IP6_ECN_flow_init(fl6.flowlabel);
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if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
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struct ip6_flowlabel *flowlabel;
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flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
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if (IS_ERR(flowlabel))
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return -EINVAL;
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fl6_sock_release(flowlabel);
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}
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}
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/*
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* connect() to INADDR_ANY means loopback (BSD'ism).
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*/
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if (ipv6_addr_any(&usin->sin6_addr)) {
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if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
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ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
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&usin->sin6_addr);
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else
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usin->sin6_addr = in6addr_loopback;
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}
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addr_type = ipv6_addr_type(&usin->sin6_addr);
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if (addr_type & IPV6_ADDR_MULTICAST)
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return -ENETUNREACH;
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if (addr_type&IPV6_ADDR_LINKLOCAL) {
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if (addr_len >= sizeof(struct sockaddr_in6) &&
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usin->sin6_scope_id) {
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/* If interface is set while binding, indices
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* must coincide.
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*/
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if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id))
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return -EINVAL;
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sk->sk_bound_dev_if = usin->sin6_scope_id;
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}
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/* Connect to link-local address requires an interface */
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if (!sk->sk_bound_dev_if)
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return -EINVAL;
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}
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if (tp->rx_opt.ts_recent_stamp &&
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!ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) {
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tp->rx_opt.ts_recent = 0;
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tp->rx_opt.ts_recent_stamp = 0;
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WRITE_ONCE(tp->write_seq, 0);
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}
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sk->sk_v6_daddr = usin->sin6_addr;
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np->flow_label = fl6.flowlabel;
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/*
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* TCP over IPv4
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*/
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if (addr_type & IPV6_ADDR_MAPPED) {
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u32 exthdrlen = icsk->icsk_ext_hdr_len;
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struct sockaddr_in sin;
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if (ipv6_only_sock(sk))
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return -ENETUNREACH;
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sin.sin_family = AF_INET;
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sin.sin_port = usin->sin6_port;
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sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
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/* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
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WRITE_ONCE(icsk->icsk_af_ops, &ipv6_mapped);
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if (sk_is_mptcp(sk))
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mptcpv6_handle_mapped(sk, true);
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sk->sk_backlog_rcv = tcp_v4_do_rcv;
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#ifdef CONFIG_TCP_MD5SIG
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tp->af_specific = &tcp_sock_ipv6_mapped_specific;
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#endif
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err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
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if (err) {
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icsk->icsk_ext_hdr_len = exthdrlen;
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/* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
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WRITE_ONCE(icsk->icsk_af_ops, &ipv6_specific);
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if (sk_is_mptcp(sk))
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mptcpv6_handle_mapped(sk, false);
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sk->sk_backlog_rcv = tcp_v6_do_rcv;
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#ifdef CONFIG_TCP_MD5SIG
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tp->af_specific = &tcp_sock_ipv6_specific;
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#endif
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goto failure;
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}
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np->saddr = sk->sk_v6_rcv_saddr;
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return err;
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}
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if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
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saddr = &sk->sk_v6_rcv_saddr;
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fl6.flowi6_proto = IPPROTO_TCP;
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fl6.daddr = sk->sk_v6_daddr;
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fl6.saddr = saddr ? *saddr : np->saddr;
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fl6.flowi6_oif = sk->sk_bound_dev_if;
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fl6.flowi6_mark = sk->sk_mark;
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fl6.fl6_dport = usin->sin6_port;
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fl6.fl6_sport = inet->inet_sport;
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fl6.flowi6_uid = sk->sk_uid;
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opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
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final_p = fl6_update_dst(&fl6, opt, &final);
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security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
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dst = ip6_dst_lookup_flow(net, sk, &fl6, final_p);
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if (IS_ERR(dst)) {
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err = PTR_ERR(dst);
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goto failure;
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}
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tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row;
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if (!saddr) {
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struct inet_bind_hashbucket *prev_addr_hashbucket = NULL;
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struct in6_addr prev_v6_rcv_saddr;
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if (icsk->icsk_bind2_hash) {
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prev_addr_hashbucket = inet_bhashfn_portaddr(tcp_death_row->hashinfo,
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sk, net, inet->inet_num);
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prev_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
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}
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saddr = &fl6.saddr;
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sk->sk_v6_rcv_saddr = *saddr;
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if (prev_addr_hashbucket) {
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err = inet_bhash2_update_saddr(prev_addr_hashbucket, sk);
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if (err) {
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sk->sk_v6_rcv_saddr = prev_v6_rcv_saddr;
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goto failure;
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}
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}
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}
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/* set the source address */
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np->saddr = *saddr;
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inet->inet_rcv_saddr = LOOPBACK4_IPV6;
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sk->sk_gso_type = SKB_GSO_TCPV6;
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ip6_dst_store(sk, dst, NULL, NULL);
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icsk->icsk_ext_hdr_len = 0;
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if (opt)
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icsk->icsk_ext_hdr_len = opt->opt_flen +
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opt->opt_nflen;
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tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
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inet->inet_dport = usin->sin6_port;
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tcp_set_state(sk, TCP_SYN_SENT);
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err = inet6_hash_connect(tcp_death_row, sk);
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if (err)
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goto late_failure;
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sk_set_txhash(sk);
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if (likely(!tp->repair)) {
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if (!tp->write_seq)
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WRITE_ONCE(tp->write_seq,
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secure_tcpv6_seq(np->saddr.s6_addr32,
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sk->sk_v6_daddr.s6_addr32,
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inet->inet_sport,
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inet->inet_dport));
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tp->tsoffset = secure_tcpv6_ts_off(net, np->saddr.s6_addr32,
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sk->sk_v6_daddr.s6_addr32);
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}
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if (tcp_fastopen_defer_connect(sk, &err))
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return err;
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if (err)
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goto late_failure;
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err = tcp_connect(sk);
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if (err)
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goto late_failure;
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return 0;
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late_failure:
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tcp_set_state(sk, TCP_CLOSE);
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failure:
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inet->inet_dport = 0;
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sk->sk_route_caps = 0;
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return err;
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}
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static void tcp_v6_mtu_reduced(struct sock *sk)
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{
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struct dst_entry *dst;
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u32 mtu;
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if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
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return;
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mtu = READ_ONCE(tcp_sk(sk)->mtu_info);
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/* Drop requests trying to increase our current mss.
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* Check done in __ip6_rt_update_pmtu() is too late.
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*/
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if (tcp_mtu_to_mss(sk, mtu) >= tcp_sk(sk)->mss_cache)
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return;
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dst = inet6_csk_update_pmtu(sk, mtu);
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if (!dst)
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return;
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if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
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tcp_sync_mss(sk, dst_mtu(dst));
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tcp_simple_retransmit(sk);
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}
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}
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static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, __be32 info)
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{
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const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
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const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
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struct net *net = dev_net(skb->dev);
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struct request_sock *fastopen;
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struct ipv6_pinfo *np;
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struct tcp_sock *tp;
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__u32 seq, snd_una;
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struct sock *sk;
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bool fatal;
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int err;
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sk = __inet6_lookup_established(net, net->ipv4.tcp_death_row.hashinfo,
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&hdr->daddr, th->dest,
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&hdr->saddr, ntohs(th->source),
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skb->dev->ifindex, inet6_sdif(skb));
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if (!sk) {
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__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
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ICMP6_MIB_INERRORS);
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return -ENOENT;
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}
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if (sk->sk_state == TCP_TIME_WAIT) {
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inet_twsk_put(inet_twsk(sk));
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return 0;
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}
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seq = ntohl(th->seq);
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fatal = icmpv6_err_convert(type, code, &err);
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if (sk->sk_state == TCP_NEW_SYN_RECV) {
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tcp_req_err(sk, seq, fatal);
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return 0;
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}
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bh_lock_sock(sk);
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if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
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__NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
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if (sk->sk_state == TCP_CLOSE)
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goto out;
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if (static_branch_unlikely(&ip6_min_hopcount)) {
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/* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */
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if (ipv6_hdr(skb)->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) {
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__NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
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goto out;
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}
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}
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tp = tcp_sk(sk);
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/* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */
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fastopen = rcu_dereference(tp->fastopen_rsk);
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snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una;
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if (sk->sk_state != TCP_LISTEN &&
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!between(seq, snd_una, tp->snd_nxt)) {
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__NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS);
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goto out;
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}
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np = tcp_inet6_sk(sk);
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if (type == NDISC_REDIRECT) {
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if (!sock_owned_by_user(sk)) {
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struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
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if (dst)
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dst->ops->redirect(dst, sk, skb);
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}
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goto out;
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}
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|
if (type == ICMPV6_PKT_TOOBIG) {
|
|
u32 mtu = ntohl(info);
|
|
|
|
/* We are not interested in TCP_LISTEN and open_requests
|
|
* (SYN-ACKs send out by Linux are always <576bytes so
|
|
* they should go through unfragmented).
|
|
*/
|
|
if (sk->sk_state == TCP_LISTEN)
|
|
goto out;
|
|
|
|
if (!ip6_sk_accept_pmtu(sk))
|
|
goto out;
|
|
|
|
if (mtu < IPV6_MIN_MTU)
|
|
goto out;
|
|
|
|
WRITE_ONCE(tp->mtu_info, mtu);
|
|
|
|
if (!sock_owned_by_user(sk))
|
|
tcp_v6_mtu_reduced(sk);
|
|
else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
|
|
&sk->sk_tsq_flags))
|
|
sock_hold(sk);
|
|
goto out;
|
|
}
|
|
|
|
|
|
/* Might be for an request_sock */
|
|
switch (sk->sk_state) {
|
|
case TCP_SYN_SENT:
|
|
case TCP_SYN_RECV:
|
|
/* Only in fast or simultaneous open. If a fast open socket is
|
|
* already accepted it is treated as a connected one below.
|
|
*/
|
|
if (fastopen && !fastopen->sk)
|
|
break;
|
|
|
|
ipv6_icmp_error(sk, skb, err, th->dest, ntohl(info), (u8 *)th);
|
|
|
|
if (!sock_owned_by_user(sk)) {
|
|
sk->sk_err = err;
|
|
sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
|
|
|
|
tcp_done(sk);
|
|
} else
|
|
sk->sk_err_soft = err;
|
|
goto out;
|
|
case TCP_LISTEN:
|
|
break;
|
|
default:
|
|
/* check if this ICMP message allows revert of backoff.
|
|
* (see RFC 6069)
|
|
*/
|
|
if (!fastopen && type == ICMPV6_DEST_UNREACH &&
|
|
code == ICMPV6_NOROUTE)
|
|
tcp_ld_RTO_revert(sk, seq);
|
|
}
|
|
|
|
if (!sock_owned_by_user(sk) && np->recverr) {
|
|
sk->sk_err = err;
|
|
sk_error_report(sk);
|
|
} else
|
|
sk->sk_err_soft = err;
|
|
|
|
out:
|
|
bh_unlock_sock(sk);
|
|
sock_put(sk);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
|
|
struct flowi *fl,
|
|
struct request_sock *req,
|
|
struct tcp_fastopen_cookie *foc,
|
|
enum tcp_synack_type synack_type,
|
|
struct sk_buff *syn_skb)
|
|
{
|
|
struct inet_request_sock *ireq = inet_rsk(req);
|
|
struct ipv6_pinfo *np = tcp_inet6_sk(sk);
|
|
struct ipv6_txoptions *opt;
|
|
struct flowi6 *fl6 = &fl->u.ip6;
|
|
struct sk_buff *skb;
|
|
int err = -ENOMEM;
|
|
u8 tclass;
|
|
|
|
/* First, grab a route. */
|
|
if (!dst && (dst = inet6_csk_route_req(sk, fl6, req,
|
|
IPPROTO_TCP)) == NULL)
|
|
goto done;
|
|
|
|
skb = tcp_make_synack(sk, dst, req, foc, synack_type, syn_skb);
|
|
|
|
if (skb) {
|
|
__tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
|
|
&ireq->ir_v6_rmt_addr);
|
|
|
|
fl6->daddr = ireq->ir_v6_rmt_addr;
|
|
if (np->repflow && ireq->pktopts)
|
|
fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
|
|
|
|
tclass = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reflect_tos) ?
|
|
(tcp_rsk(req)->syn_tos & ~INET_ECN_MASK) |
|
|
(np->tclass & INET_ECN_MASK) :
|
|
np->tclass;
|
|
|
|
if (!INET_ECN_is_capable(tclass) &&
|
|
tcp_bpf_ca_needs_ecn((struct sock *)req))
|
|
tclass |= INET_ECN_ECT_0;
|
|
|
|
rcu_read_lock();
|
|
opt = ireq->ipv6_opt;
|
|
if (!opt)
|
|
opt = rcu_dereference(np->opt);
|
|
err = ip6_xmit(sk, skb, fl6, skb->mark ? : sk->sk_mark, opt,
|
|
tclass, sk->sk_priority);
|
|
rcu_read_unlock();
|
|
err = net_xmit_eval(err);
|
|
}
|
|
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
|
|
static void tcp_v6_reqsk_destructor(struct request_sock *req)
|
|
{
|
|
kfree(inet_rsk(req)->ipv6_opt);
|
|
consume_skb(inet_rsk(req)->pktopts);
|
|
}
|
|
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
|
|
const struct in6_addr *addr,
|
|
int l3index)
|
|
{
|
|
return tcp_md5_do_lookup(sk, l3index,
|
|
(union tcp_md5_addr *)addr, AF_INET6);
|
|
}
|
|
|
|
static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
|
|
const struct sock *addr_sk)
|
|
{
|
|
int l3index;
|
|
|
|
l3index = l3mdev_master_ifindex_by_index(sock_net(sk),
|
|
addr_sk->sk_bound_dev_if);
|
|
return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr,
|
|
l3index);
|
|
}
|
|
|
|
static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
|
|
sockptr_t optval, int optlen)
|
|
{
|
|
struct tcp_md5sig cmd;
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
|
|
int l3index = 0;
|
|
u8 prefixlen;
|
|
u8 flags;
|
|
|
|
if (optlen < sizeof(cmd))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&cmd, optval, sizeof(cmd)))
|
|
return -EFAULT;
|
|
|
|
if (sin6->sin6_family != AF_INET6)
|
|
return -EINVAL;
|
|
|
|
flags = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX;
|
|
|
|
if (optname == TCP_MD5SIG_EXT &&
|
|
cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) {
|
|
prefixlen = cmd.tcpm_prefixlen;
|
|
if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) &&
|
|
prefixlen > 32))
|
|
return -EINVAL;
|
|
} else {
|
|
prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128;
|
|
}
|
|
|
|
if (optname == TCP_MD5SIG_EXT && cmd.tcpm_ifindex &&
|
|
cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX) {
|
|
struct net_device *dev;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(sock_net(sk), cmd.tcpm_ifindex);
|
|
if (dev && netif_is_l3_master(dev))
|
|
l3index = dev->ifindex;
|
|
rcu_read_unlock();
|
|
|
|
/* ok to reference set/not set outside of rcu;
|
|
* right now device MUST be an L3 master
|
|
*/
|
|
if (!dev || !l3index)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!cmd.tcpm_keylen) {
|
|
if (ipv6_addr_v4mapped(&sin6->sin6_addr))
|
|
return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
|
|
AF_INET, prefixlen,
|
|
l3index, flags);
|
|
return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
|
|
AF_INET6, prefixlen, l3index, flags);
|
|
}
|
|
|
|
if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
|
|
return -EINVAL;
|
|
|
|
if (ipv6_addr_v4mapped(&sin6->sin6_addr))
|
|
return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
|
|
AF_INET, prefixlen, l3index, flags,
|
|
cmd.tcpm_key, cmd.tcpm_keylen,
|
|
GFP_KERNEL);
|
|
|
|
return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
|
|
AF_INET6, prefixlen, l3index, flags,
|
|
cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
|
|
}
|
|
|
|
static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr,
|
|
const struct tcphdr *th, int nbytes)
|
|
{
|
|
struct tcp6_pseudohdr *bp;
|
|
struct scatterlist sg;
|
|
struct tcphdr *_th;
|
|
|
|
bp = hp->scratch;
|
|
/* 1. TCP pseudo-header (RFC2460) */
|
|
bp->saddr = *saddr;
|
|
bp->daddr = *daddr;
|
|
bp->protocol = cpu_to_be32(IPPROTO_TCP);
|
|
bp->len = cpu_to_be32(nbytes);
|
|
|
|
_th = (struct tcphdr *)(bp + 1);
|
|
memcpy(_th, th, sizeof(*th));
|
|
_th->check = 0;
|
|
|
|
sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
|
|
ahash_request_set_crypt(hp->md5_req, &sg, NULL,
|
|
sizeof(*bp) + sizeof(*th));
|
|
return crypto_ahash_update(hp->md5_req);
|
|
}
|
|
|
|
static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
|
|
const struct in6_addr *daddr, struct in6_addr *saddr,
|
|
const struct tcphdr *th)
|
|
{
|
|
struct tcp_md5sig_pool *hp;
|
|
struct ahash_request *req;
|
|
|
|
hp = tcp_get_md5sig_pool();
|
|
if (!hp)
|
|
goto clear_hash_noput;
|
|
req = hp->md5_req;
|
|
|
|
if (crypto_ahash_init(req))
|
|
goto clear_hash;
|
|
if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
|
|
goto clear_hash;
|
|
if (tcp_md5_hash_key(hp, key))
|
|
goto clear_hash;
|
|
ahash_request_set_crypt(req, NULL, md5_hash, 0);
|
|
if (crypto_ahash_final(req))
|
|
goto clear_hash;
|
|
|
|
tcp_put_md5sig_pool();
|
|
return 0;
|
|
|
|
clear_hash:
|
|
tcp_put_md5sig_pool();
|
|
clear_hash_noput:
|
|
memset(md5_hash, 0, 16);
|
|
return 1;
|
|
}
|
|
|
|
static int tcp_v6_md5_hash_skb(char *md5_hash,
|
|
const struct tcp_md5sig_key *key,
|
|
const struct sock *sk,
|
|
const struct sk_buff *skb)
|
|
{
|
|
const struct in6_addr *saddr, *daddr;
|
|
struct tcp_md5sig_pool *hp;
|
|
struct ahash_request *req;
|
|
const struct tcphdr *th = tcp_hdr(skb);
|
|
|
|
if (sk) { /* valid for establish/request sockets */
|
|
saddr = &sk->sk_v6_rcv_saddr;
|
|
daddr = &sk->sk_v6_daddr;
|
|
} else {
|
|
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
|
|
saddr = &ip6h->saddr;
|
|
daddr = &ip6h->daddr;
|
|
}
|
|
|
|
hp = tcp_get_md5sig_pool();
|
|
if (!hp)
|
|
goto clear_hash_noput;
|
|
req = hp->md5_req;
|
|
|
|
if (crypto_ahash_init(req))
|
|
goto clear_hash;
|
|
|
|
if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
|
|
goto clear_hash;
|
|
if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
|
|
goto clear_hash;
|
|
if (tcp_md5_hash_key(hp, key))
|
|
goto clear_hash;
|
|
ahash_request_set_crypt(req, NULL, md5_hash, 0);
|
|
if (crypto_ahash_final(req))
|
|
goto clear_hash;
|
|
|
|
tcp_put_md5sig_pool();
|
|
return 0;
|
|
|
|
clear_hash:
|
|
tcp_put_md5sig_pool();
|
|
clear_hash_noput:
|
|
memset(md5_hash, 0, 16);
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
static void tcp_v6_init_req(struct request_sock *req,
|
|
const struct sock *sk_listener,
|
|
struct sk_buff *skb)
|
|
{
|
|
bool l3_slave = ipv6_l3mdev_skb(TCP_SKB_CB(skb)->header.h6.flags);
|
|
struct inet_request_sock *ireq = inet_rsk(req);
|
|
const struct ipv6_pinfo *np = tcp_inet6_sk(sk_listener);
|
|
|
|
ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
|
|
ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
|
|
|
|
/* So that link locals have meaning */
|
|
if ((!sk_listener->sk_bound_dev_if || l3_slave) &&
|
|
ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
|
|
ireq->ir_iif = tcp_v6_iif(skb);
|
|
|
|
if (!TCP_SKB_CB(skb)->tcp_tw_isn &&
|
|
(ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) ||
|
|
np->rxopt.bits.rxinfo ||
|
|
np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
|
|
np->rxopt.bits.rxohlim || np->repflow)) {
|
|
refcount_inc(&skb->users);
|
|
ireq->pktopts = skb;
|
|
}
|
|
}
|
|
|
|
static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
|
|
struct sk_buff *skb,
|
|
struct flowi *fl,
|
|
struct request_sock *req)
|
|
{
|
|
tcp_v6_init_req(req, sk, skb);
|
|
|
|
if (security_inet_conn_request(sk, skb, req))
|
|
return NULL;
|
|
|
|
return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
|
|
}
|
|
|
|
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
|
|
.family = AF_INET6,
|
|
.obj_size = sizeof(struct tcp6_request_sock),
|
|
.rtx_syn_ack = tcp_rtx_synack,
|
|
.send_ack = tcp_v6_reqsk_send_ack,
|
|
.destructor = tcp_v6_reqsk_destructor,
|
|
.send_reset = tcp_v6_send_reset,
|
|
.syn_ack_timeout = tcp_syn_ack_timeout,
|
|
};
|
|
|
|
const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
|
|
.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) -
|
|
sizeof(struct ipv6hdr),
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
.req_md5_lookup = tcp_v6_md5_lookup,
|
|
.calc_md5_hash = tcp_v6_md5_hash_skb,
|
|
#endif
|
|
#ifdef CONFIG_SYN_COOKIES
|
|
.cookie_init_seq = cookie_v6_init_sequence,
|
|
#endif
|
|
.route_req = tcp_v6_route_req,
|
|
.init_seq = tcp_v6_init_seq,
|
|
.init_ts_off = tcp_v6_init_ts_off,
|
|
.send_synack = tcp_v6_send_synack,
|
|
};
|
|
|
|
static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
|
|
u32 ack, u32 win, u32 tsval, u32 tsecr,
|
|
int oif, struct tcp_md5sig_key *key, int rst,
|
|
u8 tclass, __be32 label, u32 priority, u32 txhash)
|
|
{
|
|
const struct tcphdr *th = tcp_hdr(skb);
|
|
struct tcphdr *t1;
|
|
struct sk_buff *buff;
|
|
struct flowi6 fl6;
|
|
struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
|
|
struct sock *ctl_sk = net->ipv6.tcp_sk;
|
|
unsigned int tot_len = sizeof(struct tcphdr);
|
|
__be32 mrst = 0, *topt;
|
|
struct dst_entry *dst;
|
|
__u32 mark = 0;
|
|
|
|
if (tsecr)
|
|
tot_len += TCPOLEN_TSTAMP_ALIGNED;
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
if (key)
|
|
tot_len += TCPOLEN_MD5SIG_ALIGNED;
|
|
#endif
|
|
|
|
#ifdef CONFIG_MPTCP
|
|
if (rst && !key) {
|
|
mrst = mptcp_reset_option(skb);
|
|
|
|
if (mrst)
|
|
tot_len += sizeof(__be32);
|
|
}
|
|
#endif
|
|
|
|
buff = alloc_skb(MAX_TCP_HEADER, GFP_ATOMIC);
|
|
if (!buff)
|
|
return;
|
|
|
|
skb_reserve(buff, MAX_TCP_HEADER);
|
|
|
|
t1 = skb_push(buff, tot_len);
|
|
skb_reset_transport_header(buff);
|
|
|
|
/* Swap the send and the receive. */
|
|
memset(t1, 0, sizeof(*t1));
|
|
t1->dest = th->source;
|
|
t1->source = th->dest;
|
|
t1->doff = tot_len / 4;
|
|
t1->seq = htonl(seq);
|
|
t1->ack_seq = htonl(ack);
|
|
t1->ack = !rst || !th->ack;
|
|
t1->rst = rst;
|
|
t1->window = htons(win);
|
|
|
|
topt = (__be32 *)(t1 + 1);
|
|
|
|
if (tsecr) {
|
|
*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
|
|
(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
|
|
*topt++ = htonl(tsval);
|
|
*topt++ = htonl(tsecr);
|
|
}
|
|
|
|
if (mrst)
|
|
*topt++ = mrst;
|
|
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
if (key) {
|
|
*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
|
|
(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
|
|
tcp_v6_md5_hash_hdr((__u8 *)topt, key,
|
|
&ipv6_hdr(skb)->saddr,
|
|
&ipv6_hdr(skb)->daddr, t1);
|
|
}
|
|
#endif
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.daddr = ipv6_hdr(skb)->saddr;
|
|
fl6.saddr = ipv6_hdr(skb)->daddr;
|
|
fl6.flowlabel = label;
|
|
|
|
buff->ip_summed = CHECKSUM_PARTIAL;
|
|
|
|
__tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
|
|
|
|
fl6.flowi6_proto = IPPROTO_TCP;
|
|
if (rt6_need_strict(&fl6.daddr) && !oif)
|
|
fl6.flowi6_oif = tcp_v6_iif(skb);
|
|
else {
|
|
if (!oif && netif_index_is_l3_master(net, skb->skb_iif))
|
|
oif = skb->skb_iif;
|
|
|
|
fl6.flowi6_oif = oif;
|
|
}
|
|
|
|
if (sk) {
|
|
if (sk->sk_state == TCP_TIME_WAIT)
|
|
mark = inet_twsk(sk)->tw_mark;
|
|
else
|
|
mark = sk->sk_mark;
|
|
skb_set_delivery_time(buff, tcp_transmit_time(sk), true);
|
|
}
|
|
if (txhash) {
|
|
/* autoflowlabel/skb_get_hash_flowi6 rely on buff->hash */
|
|
skb_set_hash(buff, txhash, PKT_HASH_TYPE_L4);
|
|
}
|
|
fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark) ?: mark;
|
|
fl6.fl6_dport = t1->dest;
|
|
fl6.fl6_sport = t1->source;
|
|
fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL);
|
|
security_skb_classify_flow(skb, flowi6_to_flowi_common(&fl6));
|
|
|
|
/* Pass a socket to ip6_dst_lookup either it is for RST
|
|
* Underlying function will use this to retrieve the network
|
|
* namespace
|
|
*/
|
|
if (sk && sk->sk_state != TCP_TIME_WAIT)
|
|
dst = ip6_dst_lookup_flow(net, sk, &fl6, NULL); /*sk's xfrm_policy can be referred*/
|
|
else
|
|
dst = ip6_dst_lookup_flow(net, ctl_sk, &fl6, NULL);
|
|
if (!IS_ERR(dst)) {
|
|
skb_dst_set(buff, dst);
|
|
ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL,
|
|
tclass & ~INET_ECN_MASK, priority);
|
|
TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
|
|
if (rst)
|
|
TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
|
|
return;
|
|
}
|
|
|
|
kfree_skb(buff);
|
|
}
|
|
|
|
static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
const struct tcphdr *th = tcp_hdr(skb);
|
|
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
u32 seq = 0, ack_seq = 0;
|
|
struct tcp_md5sig_key *key = NULL;
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
const __u8 *hash_location = NULL;
|
|
unsigned char newhash[16];
|
|
int genhash;
|
|
struct sock *sk1 = NULL;
|
|
#endif
|
|
__be32 label = 0;
|
|
u32 priority = 0;
|
|
struct net *net;
|
|
u32 txhash = 0;
|
|
int oif = 0;
|
|
|
|
if (th->rst)
|
|
return;
|
|
|
|
/* If sk not NULL, it means we did a successful lookup and incoming
|
|
* route had to be correct. prequeue might have dropped our dst.
|
|
*/
|
|
if (!sk && !ipv6_unicast_destination(skb))
|
|
return;
|
|
|
|
net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
rcu_read_lock();
|
|
hash_location = tcp_parse_md5sig_option(th);
|
|
if (sk && sk_fullsock(sk)) {
|
|
int l3index;
|
|
|
|
/* sdif set, means packet ingressed via a device
|
|
* in an L3 domain and inet_iif is set to it.
|
|
*/
|
|
l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
|
|
key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index);
|
|
} else if (hash_location) {
|
|
int dif = tcp_v6_iif_l3_slave(skb);
|
|
int sdif = tcp_v6_sdif(skb);
|
|
int l3index;
|
|
|
|
/*
|
|
* active side is lost. Try to find listening socket through
|
|
* source port, and then find md5 key through listening socket.
|
|
* we are not loose security here:
|
|
* Incoming packet is checked with md5 hash with finding key,
|
|
* no RST generated if md5 hash doesn't match.
|
|
*/
|
|
sk1 = inet6_lookup_listener(net, net->ipv4.tcp_death_row.hashinfo,
|
|
NULL, 0, &ipv6h->saddr, th->source,
|
|
&ipv6h->daddr, ntohs(th->source),
|
|
dif, sdif);
|
|
if (!sk1)
|
|
goto out;
|
|
|
|
/* sdif set, means packet ingressed via a device
|
|
* in an L3 domain and dif is set to it.
|
|
*/
|
|
l3index = tcp_v6_sdif(skb) ? dif : 0;
|
|
|
|
key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr, l3index);
|
|
if (!key)
|
|
goto out;
|
|
|
|
genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
|
|
if (genhash || memcmp(hash_location, newhash, 16) != 0)
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
if (th->ack)
|
|
seq = ntohl(th->ack_seq);
|
|
else
|
|
ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
|
|
(th->doff << 2);
|
|
|
|
if (sk) {
|
|
oif = sk->sk_bound_dev_if;
|
|
if (sk_fullsock(sk)) {
|
|
const struct ipv6_pinfo *np = tcp_inet6_sk(sk);
|
|
|
|
trace_tcp_send_reset(sk, skb);
|
|
if (np->repflow)
|
|
label = ip6_flowlabel(ipv6h);
|
|
priority = sk->sk_priority;
|
|
txhash = sk->sk_hash;
|
|
}
|
|
if (sk->sk_state == TCP_TIME_WAIT) {
|
|
label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel);
|
|
priority = inet_twsk(sk)->tw_priority;
|
|
txhash = inet_twsk(sk)->tw_txhash;
|
|
}
|
|
} else {
|
|
if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET)
|
|
label = ip6_flowlabel(ipv6h);
|
|
}
|
|
|
|
tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1,
|
|
ipv6_get_dsfield(ipv6h), label, priority, txhash);
|
|
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
out:
|
|
rcu_read_unlock();
|
|
#endif
|
|
}
|
|
|
|
static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
|
|
u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
|
|
struct tcp_md5sig_key *key, u8 tclass,
|
|
__be32 label, u32 priority, u32 txhash)
|
|
{
|
|
tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
|
|
tclass, label, priority, txhash);
|
|
}
|
|
|
|
static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct inet_timewait_sock *tw = inet_twsk(sk);
|
|
struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
|
|
|
|
tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
|
|
tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
|
|
tcp_time_stamp_raw() + tcptw->tw_ts_offset,
|
|
tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
|
|
tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority,
|
|
tw->tw_txhash);
|
|
|
|
inet_twsk_put(tw);
|
|
}
|
|
|
|
static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
|
|
struct request_sock *req)
|
|
{
|
|
int l3index;
|
|
|
|
l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
|
|
|
|
/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
|
|
* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
|
|
*/
|
|
/* RFC 7323 2.3
|
|
* The window field (SEG.WND) of every outgoing segment, with the
|
|
* exception of <SYN> segments, MUST be right-shifted by
|
|
* Rcv.Wind.Shift bits:
|
|
*/
|
|
tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ?
|
|
tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
|
|
tcp_rsk(req)->rcv_nxt,
|
|
req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
|
|
tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
|
|
req->ts_recent, sk->sk_bound_dev_if,
|
|
tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index),
|
|
ipv6_get_dsfield(ipv6_hdr(skb)), 0, sk->sk_priority,
|
|
tcp_rsk(req)->txhash);
|
|
}
|
|
|
|
|
|
static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_SYN_COOKIES
|
|
const struct tcphdr *th = tcp_hdr(skb);
|
|
|
|
if (!th->syn)
|
|
sk = cookie_v6_check(sk, skb);
|
|
#endif
|
|
return sk;
|
|
}
|
|
|
|
u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph,
|
|
struct tcphdr *th, u32 *cookie)
|
|
{
|
|
u16 mss = 0;
|
|
#ifdef CONFIG_SYN_COOKIES
|
|
mss = tcp_get_syncookie_mss(&tcp6_request_sock_ops,
|
|
&tcp_request_sock_ipv6_ops, sk, th);
|
|
if (mss) {
|
|
*cookie = __cookie_v6_init_sequence(iph, th, &mss);
|
|
tcp_synq_overflow(sk);
|
|
}
|
|
#endif
|
|
return mss;
|
|
}
|
|
|
|
static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
return tcp_v4_conn_request(sk, skb);
|
|
|
|
if (!ipv6_unicast_destination(skb))
|
|
goto drop;
|
|
|
|
if (ipv6_addr_v4mapped(&ipv6_hdr(skb)->saddr)) {
|
|
__IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS);
|
|
return 0;
|
|
}
|
|
|
|
return tcp_conn_request(&tcp6_request_sock_ops,
|
|
&tcp_request_sock_ipv6_ops, sk, skb);
|
|
|
|
drop:
|
|
tcp_listendrop(sk);
|
|
return 0; /* don't send reset */
|
|
}
|
|
|
|
static void tcp_v6_restore_cb(struct sk_buff *skb)
|
|
{
|
|
/* We need to move header back to the beginning if xfrm6_policy_check()
|
|
* and tcp_v6_fill_cb() are going to be called again.
|
|
* ip6_datagram_recv_specific_ctl() also expects IP6CB to be there.
|
|
*/
|
|
memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6,
|
|
sizeof(struct inet6_skb_parm));
|
|
}
|
|
|
|
static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
|
|
struct request_sock *req,
|
|
struct dst_entry *dst,
|
|
struct request_sock *req_unhash,
|
|
bool *own_req)
|
|
{
|
|
struct inet_request_sock *ireq;
|
|
struct ipv6_pinfo *newnp;
|
|
const struct ipv6_pinfo *np = tcp_inet6_sk(sk);
|
|
struct ipv6_txoptions *opt;
|
|
struct inet_sock *newinet;
|
|
bool found_dup_sk = false;
|
|
struct tcp_sock *newtp;
|
|
struct sock *newsk;
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
struct tcp_md5sig_key *key;
|
|
int l3index;
|
|
#endif
|
|
struct flowi6 fl6;
|
|
|
|
if (skb->protocol == htons(ETH_P_IP)) {
|
|
/*
|
|
* v6 mapped
|
|
*/
|
|
|
|
newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst,
|
|
req_unhash, own_req);
|
|
|
|
if (!newsk)
|
|
return NULL;
|
|
|
|
inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk);
|
|
|
|
newnp = tcp_inet6_sk(newsk);
|
|
newtp = tcp_sk(newsk);
|
|
|
|
memcpy(newnp, np, sizeof(struct ipv6_pinfo));
|
|
|
|
newnp->saddr = newsk->sk_v6_rcv_saddr;
|
|
|
|
inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
|
|
if (sk_is_mptcp(newsk))
|
|
mptcpv6_handle_mapped(newsk, true);
|
|
newsk->sk_backlog_rcv = tcp_v4_do_rcv;
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
|
|
#endif
|
|
|
|
newnp->ipv6_mc_list = NULL;
|
|
newnp->ipv6_ac_list = NULL;
|
|
newnp->ipv6_fl_list = NULL;
|
|
newnp->pktoptions = NULL;
|
|
newnp->opt = NULL;
|
|
newnp->mcast_oif = inet_iif(skb);
|
|
newnp->mcast_hops = ip_hdr(skb)->ttl;
|
|
newnp->rcv_flowinfo = 0;
|
|
if (np->repflow)
|
|
newnp->flow_label = 0;
|
|
|
|
/*
|
|
* No need to charge this sock to the relevant IPv6 refcnt debug socks count
|
|
* here, tcp_create_openreq_child now does this for us, see the comment in
|
|
* that function for the gory details. -acme
|
|
*/
|
|
|
|
/* It is tricky place. Until this moment IPv4 tcp
|
|
worked with IPv6 icsk.icsk_af_ops.
|
|
Sync it now.
|
|
*/
|
|
tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
|
|
|
|
return newsk;
|
|
}
|
|
|
|
ireq = inet_rsk(req);
|
|
|
|
if (sk_acceptq_is_full(sk))
|
|
goto out_overflow;
|
|
|
|
if (!dst) {
|
|
dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP);
|
|
if (!dst)
|
|
goto out;
|
|
}
|
|
|
|
newsk = tcp_create_openreq_child(sk, req, skb);
|
|
if (!newsk)
|
|
goto out_nonewsk;
|
|
|
|
/*
|
|
* No need to charge this sock to the relevant IPv6 refcnt debug socks
|
|
* count here, tcp_create_openreq_child now does this for us, see the
|
|
* comment in that function for the gory details. -acme
|
|
*/
|
|
|
|
newsk->sk_gso_type = SKB_GSO_TCPV6;
|
|
ip6_dst_store(newsk, dst, NULL, NULL);
|
|
inet6_sk_rx_dst_set(newsk, skb);
|
|
|
|
inet_sk(newsk)->pinet6 = tcp_inet6_sk(newsk);
|
|
|
|
newtp = tcp_sk(newsk);
|
|
newinet = inet_sk(newsk);
|
|
newnp = tcp_inet6_sk(newsk);
|
|
|
|
memcpy(newnp, np, sizeof(struct ipv6_pinfo));
|
|
|
|
newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
|
|
newnp->saddr = ireq->ir_v6_loc_addr;
|
|
newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
|
|
newsk->sk_bound_dev_if = ireq->ir_iif;
|
|
|
|
/* Now IPv6 options...
|
|
|
|
First: no IPv4 options.
|
|
*/
|
|
newinet->inet_opt = NULL;
|
|
newnp->ipv6_mc_list = NULL;
|
|
newnp->ipv6_ac_list = NULL;
|
|
newnp->ipv6_fl_list = NULL;
|
|
|
|
/* Clone RX bits */
|
|
newnp->rxopt.all = np->rxopt.all;
|
|
|
|
newnp->pktoptions = NULL;
|
|
newnp->opt = NULL;
|
|
newnp->mcast_oif = tcp_v6_iif(skb);
|
|
newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
|
|
newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
|
|
if (np->repflow)
|
|
newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
|
|
|
|
/* Set ToS of the new socket based upon the value of incoming SYN.
|
|
* ECT bits are set later in tcp_init_transfer().
|
|
*/
|
|
if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reflect_tos))
|
|
newnp->tclass = tcp_rsk(req)->syn_tos & ~INET_ECN_MASK;
|
|
|
|
/* Clone native IPv6 options from listening socket (if any)
|
|
|
|
Yes, keeping reference count would be much more clever,
|
|
but we make one more one thing there: reattach optmem
|
|
to newsk.
|
|
*/
|
|
opt = ireq->ipv6_opt;
|
|
if (!opt)
|
|
opt = rcu_dereference(np->opt);
|
|
if (opt) {
|
|
opt = ipv6_dup_options(newsk, opt);
|
|
RCU_INIT_POINTER(newnp->opt, opt);
|
|
}
|
|
inet_csk(newsk)->icsk_ext_hdr_len = 0;
|
|
if (opt)
|
|
inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
|
|
opt->opt_flen;
|
|
|
|
tcp_ca_openreq_child(newsk, dst);
|
|
|
|
tcp_sync_mss(newsk, dst_mtu(dst));
|
|
newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst));
|
|
|
|
tcp_initialize_rcv_mss(newsk);
|
|
|
|
newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
|
|
newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
|
|
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
|
|
|
|
/* Copy over the MD5 key from the original socket */
|
|
key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index);
|
|
if (key) {
|
|
/* We're using one, so create a matching key
|
|
* on the newsk structure. If we fail to get
|
|
* memory, then we end up not copying the key
|
|
* across. Shucks.
|
|
*/
|
|
tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
|
|
AF_INET6, 128, l3index, key->flags, key->key, key->keylen,
|
|
sk_gfp_mask(sk, GFP_ATOMIC));
|
|
}
|
|
#endif
|
|
|
|
if (__inet_inherit_port(sk, newsk) < 0) {
|
|
inet_csk_prepare_forced_close(newsk);
|
|
tcp_done(newsk);
|
|
goto out;
|
|
}
|
|
*own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash),
|
|
&found_dup_sk);
|
|
if (*own_req) {
|
|
tcp_move_syn(newtp, req);
|
|
|
|
/* Clone pktoptions received with SYN, if we own the req */
|
|
if (ireq->pktopts) {
|
|
newnp->pktoptions = skb_clone(ireq->pktopts,
|
|
sk_gfp_mask(sk, GFP_ATOMIC));
|
|
consume_skb(ireq->pktopts);
|
|
ireq->pktopts = NULL;
|
|
if (newnp->pktoptions) {
|
|
tcp_v6_restore_cb(newnp->pktoptions);
|
|
skb_set_owner_r(newnp->pktoptions, newsk);
|
|
}
|
|
}
|
|
} else {
|
|
if (!req_unhash && found_dup_sk) {
|
|
/* This code path should only be executed in the
|
|
* syncookie case only
|
|
*/
|
|
bh_unlock_sock(newsk);
|
|
sock_put(newsk);
|
|
newsk = NULL;
|
|
}
|
|
}
|
|
|
|
return newsk;
|
|
|
|
out_overflow:
|
|
__NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
|
|
out_nonewsk:
|
|
dst_release(dst);
|
|
out:
|
|
tcp_listendrop(sk);
|
|
return NULL;
|
|
}
|
|
|
|
INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
|
|
u32));
|
|
/* The socket must have it's spinlock held when we get
|
|
* here, unless it is a TCP_LISTEN socket.
|
|
*
|
|
* We have a potential double-lock case here, so even when
|
|
* doing backlog processing we use the BH locking scheme.
|
|
* This is because we cannot sleep with the original spinlock
|
|
* held.
|
|
*/
|
|
INDIRECT_CALLABLE_SCOPE
|
|
int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct ipv6_pinfo *np = tcp_inet6_sk(sk);
|
|
struct sk_buff *opt_skb = NULL;
|
|
enum skb_drop_reason reason;
|
|
struct tcp_sock *tp;
|
|
|
|
/* Imagine: socket is IPv6. IPv4 packet arrives,
|
|
goes to IPv4 receive handler and backlogged.
|
|
From backlog it always goes here. Kerboom...
|
|
Fortunately, tcp_rcv_established and rcv_established
|
|
handle them correctly, but it is not case with
|
|
tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
|
|
*/
|
|
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
return tcp_v4_do_rcv(sk, skb);
|
|
|
|
/*
|
|
* socket locking is here for SMP purposes as backlog rcv
|
|
* is currently called with bh processing disabled.
|
|
*/
|
|
|
|
/* Do Stevens' IPV6_PKTOPTIONS.
|
|
|
|
Yes, guys, it is the only place in our code, where we
|
|
may make it not affecting IPv4.
|
|
The rest of code is protocol independent,
|
|
and I do not like idea to uglify IPv4.
|
|
|
|
Actually, all the idea behind IPV6_PKTOPTIONS
|
|
looks not very well thought. For now we latch
|
|
options, received in the last packet, enqueued
|
|
by tcp. Feel free to propose better solution.
|
|
--ANK (980728)
|
|
*/
|
|
if (np->rxopt.all)
|
|
opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC));
|
|
|
|
reason = SKB_DROP_REASON_NOT_SPECIFIED;
|
|
if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
|
|
struct dst_entry *dst;
|
|
|
|
dst = rcu_dereference_protected(sk->sk_rx_dst,
|
|
lockdep_sock_is_held(sk));
|
|
|
|
sock_rps_save_rxhash(sk, skb);
|
|
sk_mark_napi_id(sk, skb);
|
|
if (dst) {
|
|
if (sk->sk_rx_dst_ifindex != skb->skb_iif ||
|
|
INDIRECT_CALL_1(dst->ops->check, ip6_dst_check,
|
|
dst, sk->sk_rx_dst_cookie) == NULL) {
|
|
RCU_INIT_POINTER(sk->sk_rx_dst, NULL);
|
|
dst_release(dst);
|
|
}
|
|
}
|
|
|
|
tcp_rcv_established(sk, skb);
|
|
if (opt_skb)
|
|
goto ipv6_pktoptions;
|
|
return 0;
|
|
}
|
|
|
|
if (tcp_checksum_complete(skb))
|
|
goto csum_err;
|
|
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
struct sock *nsk = tcp_v6_cookie_check(sk, skb);
|
|
|
|
if (!nsk)
|
|
goto discard;
|
|
|
|
if (nsk != sk) {
|
|
if (tcp_child_process(sk, nsk, skb))
|
|
goto reset;
|
|
if (opt_skb)
|
|
__kfree_skb(opt_skb);
|
|
return 0;
|
|
}
|
|
} else
|
|
sock_rps_save_rxhash(sk, skb);
|
|
|
|
if (tcp_rcv_state_process(sk, skb))
|
|
goto reset;
|
|
if (opt_skb)
|
|
goto ipv6_pktoptions;
|
|
return 0;
|
|
|
|
reset:
|
|
tcp_v6_send_reset(sk, skb);
|
|
discard:
|
|
if (opt_skb)
|
|
__kfree_skb(opt_skb);
|
|
kfree_skb_reason(skb, reason);
|
|
return 0;
|
|
csum_err:
|
|
reason = SKB_DROP_REASON_TCP_CSUM;
|
|
trace_tcp_bad_csum(skb);
|
|
TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
|
|
TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
|
|
goto discard;
|
|
|
|
|
|
ipv6_pktoptions:
|
|
/* Do you ask, what is it?
|
|
|
|
1. skb was enqueued by tcp.
|
|
2. skb is added to tail of read queue, rather than out of order.
|
|
3. socket is not in passive state.
|
|
4. Finally, it really contains options, which user wants to receive.
|
|
*/
|
|
tp = tcp_sk(sk);
|
|
if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
|
|
!((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
|
|
if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
|
|
np->mcast_oif = tcp_v6_iif(opt_skb);
|
|
if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
|
|
np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
|
|
if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
|
|
np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
|
|
if (np->repflow)
|
|
np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
|
|
if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
|
|
skb_set_owner_r(opt_skb, sk);
|
|
tcp_v6_restore_cb(opt_skb);
|
|
opt_skb = xchg(&np->pktoptions, opt_skb);
|
|
} else {
|
|
__kfree_skb(opt_skb);
|
|
opt_skb = xchg(&np->pktoptions, NULL);
|
|
}
|
|
}
|
|
|
|
consume_skb(opt_skb);
|
|
return 0;
|
|
}
|
|
|
|
static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr,
|
|
const struct tcphdr *th)
|
|
{
|
|
/* This is tricky: we move IP6CB at its correct location into
|
|
* TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because
|
|
* _decode_session6() uses IP6CB().
|
|
* barrier() makes sure compiler won't play aliasing games.
|
|
*/
|
|
memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb),
|
|
sizeof(struct inet6_skb_parm));
|
|
barrier();
|
|
|
|
TCP_SKB_CB(skb)->seq = ntohl(th->seq);
|
|
TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
|
|
skb->len - th->doff*4);
|
|
TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
|
|
TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
|
|
TCP_SKB_CB(skb)->tcp_tw_isn = 0;
|
|
TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
|
|
TCP_SKB_CB(skb)->sacked = 0;
|
|
TCP_SKB_CB(skb)->has_rxtstamp =
|
|
skb->tstamp || skb_hwtstamps(skb)->hwtstamp;
|
|
}
|
|
|
|
INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
|
|
{
|
|
enum skb_drop_reason drop_reason;
|
|
int sdif = inet6_sdif(skb);
|
|
int dif = inet6_iif(skb);
|
|
const struct tcphdr *th;
|
|
const struct ipv6hdr *hdr;
|
|
bool refcounted;
|
|
struct sock *sk;
|
|
int ret;
|
|
struct net *net = dev_net(skb->dev);
|
|
|
|
drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
|
|
if (skb->pkt_type != PACKET_HOST)
|
|
goto discard_it;
|
|
|
|
/*
|
|
* Count it even if it's bad.
|
|
*/
|
|
__TCP_INC_STATS(net, TCP_MIB_INSEGS);
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
|
|
goto discard_it;
|
|
|
|
th = (const struct tcphdr *)skb->data;
|
|
|
|
if (unlikely(th->doff < sizeof(struct tcphdr) / 4)) {
|
|
drop_reason = SKB_DROP_REASON_PKT_TOO_SMALL;
|
|
goto bad_packet;
|
|
}
|
|
if (!pskb_may_pull(skb, th->doff*4))
|
|
goto discard_it;
|
|
|
|
if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo))
|
|
goto csum_error;
|
|
|
|
th = (const struct tcphdr *)skb->data;
|
|
hdr = ipv6_hdr(skb);
|
|
|
|
lookup:
|
|
sk = __inet6_lookup_skb(net->ipv4.tcp_death_row.hashinfo, skb, __tcp_hdrlen(th),
|
|
th->source, th->dest, inet6_iif(skb), sdif,
|
|
&refcounted);
|
|
if (!sk)
|
|
goto no_tcp_socket;
|
|
|
|
process:
|
|
if (sk->sk_state == TCP_TIME_WAIT)
|
|
goto do_time_wait;
|
|
|
|
if (sk->sk_state == TCP_NEW_SYN_RECV) {
|
|
struct request_sock *req = inet_reqsk(sk);
|
|
bool req_stolen = false;
|
|
struct sock *nsk;
|
|
|
|
sk = req->rsk_listener;
|
|
drop_reason = tcp_inbound_md5_hash(sk, skb,
|
|
&hdr->saddr, &hdr->daddr,
|
|
AF_INET6, dif, sdif);
|
|
if (drop_reason) {
|
|
sk_drops_add(sk, skb);
|
|
reqsk_put(req);
|
|
goto discard_it;
|
|
}
|
|
if (tcp_checksum_complete(skb)) {
|
|
reqsk_put(req);
|
|
goto csum_error;
|
|
}
|
|
if (unlikely(sk->sk_state != TCP_LISTEN)) {
|
|
nsk = reuseport_migrate_sock(sk, req_to_sk(req), skb);
|
|
if (!nsk) {
|
|
inet_csk_reqsk_queue_drop_and_put(sk, req);
|
|
goto lookup;
|
|
}
|
|
sk = nsk;
|
|
/* reuseport_migrate_sock() has already held one sk_refcnt
|
|
* before returning.
|
|
*/
|
|
} else {
|
|
sock_hold(sk);
|
|
}
|
|
refcounted = true;
|
|
nsk = NULL;
|
|
if (!tcp_filter(sk, skb)) {
|
|
th = (const struct tcphdr *)skb->data;
|
|
hdr = ipv6_hdr(skb);
|
|
tcp_v6_fill_cb(skb, hdr, th);
|
|
nsk = tcp_check_req(sk, skb, req, false, &req_stolen);
|
|
} else {
|
|
drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
|
|
}
|
|
if (!nsk) {
|
|
reqsk_put(req);
|
|
if (req_stolen) {
|
|
/* Another cpu got exclusive access to req
|
|
* and created a full blown socket.
|
|
* Try to feed this packet to this socket
|
|
* instead of discarding it.
|
|
*/
|
|
tcp_v6_restore_cb(skb);
|
|
sock_put(sk);
|
|
goto lookup;
|
|
}
|
|
goto discard_and_relse;
|
|
}
|
|
if (nsk == sk) {
|
|
reqsk_put(req);
|
|
tcp_v6_restore_cb(skb);
|
|
} else if (tcp_child_process(sk, nsk, skb)) {
|
|
tcp_v6_send_reset(nsk, skb);
|
|
goto discard_and_relse;
|
|
} else {
|
|
sock_put(sk);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (static_branch_unlikely(&ip6_min_hopcount)) {
|
|
/* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */
|
|
if (hdr->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) {
|
|
__NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
|
|
goto discard_and_relse;
|
|
}
|
|
}
|
|
|
|
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
|
|
drop_reason = SKB_DROP_REASON_XFRM_POLICY;
|
|
goto discard_and_relse;
|
|
}
|
|
|
|
drop_reason = tcp_inbound_md5_hash(sk, skb, &hdr->saddr, &hdr->daddr,
|
|
AF_INET6, dif, sdif);
|
|
if (drop_reason)
|
|
goto discard_and_relse;
|
|
|
|
if (tcp_filter(sk, skb)) {
|
|
drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
|
|
goto discard_and_relse;
|
|
}
|
|
th = (const struct tcphdr *)skb->data;
|
|
hdr = ipv6_hdr(skb);
|
|
tcp_v6_fill_cb(skb, hdr, th);
|
|
|
|
skb->dev = NULL;
|
|
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
ret = tcp_v6_do_rcv(sk, skb);
|
|
goto put_and_return;
|
|
}
|
|
|
|
sk_incoming_cpu_update(sk);
|
|
|
|
bh_lock_sock_nested(sk);
|
|
tcp_segs_in(tcp_sk(sk), skb);
|
|
ret = 0;
|
|
if (!sock_owned_by_user(sk)) {
|
|
ret = tcp_v6_do_rcv(sk, skb);
|
|
} else {
|
|
if (tcp_add_backlog(sk, skb, &drop_reason))
|
|
goto discard_and_relse;
|
|
}
|
|
bh_unlock_sock(sk);
|
|
put_and_return:
|
|
if (refcounted)
|
|
sock_put(sk);
|
|
return ret ? -1 : 0;
|
|
|
|
no_tcp_socket:
|
|
drop_reason = SKB_DROP_REASON_NO_SOCKET;
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto discard_it;
|
|
|
|
tcp_v6_fill_cb(skb, hdr, th);
|
|
|
|
if (tcp_checksum_complete(skb)) {
|
|
csum_error:
|
|
drop_reason = SKB_DROP_REASON_TCP_CSUM;
|
|
trace_tcp_bad_csum(skb);
|
|
__TCP_INC_STATS(net, TCP_MIB_CSUMERRORS);
|
|
bad_packet:
|
|
__TCP_INC_STATS(net, TCP_MIB_INERRS);
|
|
} else {
|
|
tcp_v6_send_reset(NULL, skb);
|
|
}
|
|
|
|
discard_it:
|
|
SKB_DR_OR(drop_reason, NOT_SPECIFIED);
|
|
kfree_skb_reason(skb, drop_reason);
|
|
return 0;
|
|
|
|
discard_and_relse:
|
|
sk_drops_add(sk, skb);
|
|
if (refcounted)
|
|
sock_put(sk);
|
|
goto discard_it;
|
|
|
|
do_time_wait:
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
|
|
drop_reason = SKB_DROP_REASON_XFRM_POLICY;
|
|
inet_twsk_put(inet_twsk(sk));
|
|
goto discard_it;
|
|
}
|
|
|
|
tcp_v6_fill_cb(skb, hdr, th);
|
|
|
|
if (tcp_checksum_complete(skb)) {
|
|
inet_twsk_put(inet_twsk(sk));
|
|
goto csum_error;
|
|
}
|
|
|
|
switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
|
|
case TCP_TW_SYN:
|
|
{
|
|
struct sock *sk2;
|
|
|
|
sk2 = inet6_lookup_listener(net, net->ipv4.tcp_death_row.hashinfo,
|
|
skb, __tcp_hdrlen(th),
|
|
&ipv6_hdr(skb)->saddr, th->source,
|
|
&ipv6_hdr(skb)->daddr,
|
|
ntohs(th->dest),
|
|
tcp_v6_iif_l3_slave(skb),
|
|
sdif);
|
|
if (sk2) {
|
|
struct inet_timewait_sock *tw = inet_twsk(sk);
|
|
inet_twsk_deschedule_put(tw);
|
|
sk = sk2;
|
|
tcp_v6_restore_cb(skb);
|
|
refcounted = false;
|
|
goto process;
|
|
}
|
|
}
|
|
/* to ACK */
|
|
fallthrough;
|
|
case TCP_TW_ACK:
|
|
tcp_v6_timewait_ack(sk, skb);
|
|
break;
|
|
case TCP_TW_RST:
|
|
tcp_v6_send_reset(sk, skb);
|
|
inet_twsk_deschedule_put(inet_twsk(sk));
|
|
goto discard_it;
|
|
case TCP_TW_SUCCESS:
|
|
;
|
|
}
|
|
goto discard_it;
|
|
}
|
|
|
|
void tcp_v6_early_demux(struct sk_buff *skb)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
const struct ipv6hdr *hdr;
|
|
const struct tcphdr *th;
|
|
struct sock *sk;
|
|
|
|
if (skb->pkt_type != PACKET_HOST)
|
|
return;
|
|
|
|
if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
|
|
return;
|
|
|
|
hdr = ipv6_hdr(skb);
|
|
th = tcp_hdr(skb);
|
|
|
|
if (th->doff < sizeof(struct tcphdr) / 4)
|
|
return;
|
|
|
|
/* Note : We use inet6_iif() here, not tcp_v6_iif() */
|
|
sk = __inet6_lookup_established(net, net->ipv4.tcp_death_row.hashinfo,
|
|
&hdr->saddr, th->source,
|
|
&hdr->daddr, ntohs(th->dest),
|
|
inet6_iif(skb), inet6_sdif(skb));
|
|
if (sk) {
|
|
skb->sk = sk;
|
|
skb->destructor = sock_edemux;
|
|
if (sk_fullsock(sk)) {
|
|
struct dst_entry *dst = rcu_dereference(sk->sk_rx_dst);
|
|
|
|
if (dst)
|
|
dst = dst_check(dst, sk->sk_rx_dst_cookie);
|
|
if (dst &&
|
|
sk->sk_rx_dst_ifindex == skb->skb_iif)
|
|
skb_dst_set_noref(skb, dst);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct timewait_sock_ops tcp6_timewait_sock_ops = {
|
|
.twsk_obj_size = sizeof(struct tcp6_timewait_sock),
|
|
.twsk_unique = tcp_twsk_unique,
|
|
.twsk_destructor = tcp_twsk_destructor,
|
|
};
|
|
|
|
INDIRECT_CALLABLE_SCOPE void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
__tcp_v6_send_check(skb, &sk->sk_v6_rcv_saddr, &sk->sk_v6_daddr);
|
|
}
|
|
|
|
const struct inet_connection_sock_af_ops ipv6_specific = {
|
|
.queue_xmit = inet6_csk_xmit,
|
|
.send_check = tcp_v6_send_check,
|
|
.rebuild_header = inet6_sk_rebuild_header,
|
|
.sk_rx_dst_set = inet6_sk_rx_dst_set,
|
|
.conn_request = tcp_v6_conn_request,
|
|
.syn_recv_sock = tcp_v6_syn_recv_sock,
|
|
.net_header_len = sizeof(struct ipv6hdr),
|
|
.net_frag_header_len = sizeof(struct frag_hdr),
|
|
.setsockopt = ipv6_setsockopt,
|
|
.getsockopt = ipv6_getsockopt,
|
|
.addr2sockaddr = inet6_csk_addr2sockaddr,
|
|
.sockaddr_len = sizeof(struct sockaddr_in6),
|
|
.mtu_reduced = tcp_v6_mtu_reduced,
|
|
};
|
|
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
|
|
.md5_lookup = tcp_v6_md5_lookup,
|
|
.calc_md5_hash = tcp_v6_md5_hash_skb,
|
|
.md5_parse = tcp_v6_parse_md5_keys,
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* TCP over IPv4 via INET6 API
|
|
*/
|
|
static const struct inet_connection_sock_af_ops ipv6_mapped = {
|
|
.queue_xmit = ip_queue_xmit,
|
|
.send_check = tcp_v4_send_check,
|
|
.rebuild_header = inet_sk_rebuild_header,
|
|
.sk_rx_dst_set = inet_sk_rx_dst_set,
|
|
.conn_request = tcp_v6_conn_request,
|
|
.syn_recv_sock = tcp_v6_syn_recv_sock,
|
|
.net_header_len = sizeof(struct iphdr),
|
|
.setsockopt = ipv6_setsockopt,
|
|
.getsockopt = ipv6_getsockopt,
|
|
.addr2sockaddr = inet6_csk_addr2sockaddr,
|
|
.sockaddr_len = sizeof(struct sockaddr_in6),
|
|
.mtu_reduced = tcp_v4_mtu_reduced,
|
|
};
|
|
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
|
|
.md5_lookup = tcp_v4_md5_lookup,
|
|
.calc_md5_hash = tcp_v4_md5_hash_skb,
|
|
.md5_parse = tcp_v6_parse_md5_keys,
|
|
};
|
|
#endif
|
|
|
|
/* NOTE: A lot of things set to zero explicitly by call to
|
|
* sk_alloc() so need not be done here.
|
|
*/
|
|
static int tcp_v6_init_sock(struct sock *sk)
|
|
{
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
|
|
tcp_init_sock(sk);
|
|
|
|
icsk->icsk_af_ops = &ipv6_specific;
|
|
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tcp_v6_destroy_sock(struct sock *sk)
|
|
{
|
|
tcp_v4_destroy_sock(sk);
|
|
inet6_destroy_sock(sk);
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
/* Proc filesystem TCPv6 sock list dumping. */
|
|
static void get_openreq6(struct seq_file *seq,
|
|
const struct request_sock *req, int i)
|
|
{
|
|
long ttd = req->rsk_timer.expires - jiffies;
|
|
const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr;
|
|
const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr;
|
|
|
|
if (ttd < 0)
|
|
ttd = 0;
|
|
|
|
seq_printf(seq,
|
|
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
|
"%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n",
|
|
i,
|
|
src->s6_addr32[0], src->s6_addr32[1],
|
|
src->s6_addr32[2], src->s6_addr32[3],
|
|
inet_rsk(req)->ir_num,
|
|
dest->s6_addr32[0], dest->s6_addr32[1],
|
|
dest->s6_addr32[2], dest->s6_addr32[3],
|
|
ntohs(inet_rsk(req)->ir_rmt_port),
|
|
TCP_SYN_RECV,
|
|
0, 0, /* could print option size, but that is af dependent. */
|
|
1, /* timers active (only the expire timer) */
|
|
jiffies_to_clock_t(ttd),
|
|
req->num_timeout,
|
|
from_kuid_munged(seq_user_ns(seq),
|
|
sock_i_uid(req->rsk_listener)),
|
|
0, /* non standard timer */
|
|
0, /* open_requests have no inode */
|
|
0, req);
|
|
}
|
|
|
|
static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
|
|
{
|
|
const struct in6_addr *dest, *src;
|
|
__u16 destp, srcp;
|
|
int timer_active;
|
|
unsigned long timer_expires;
|
|
const struct inet_sock *inet = inet_sk(sp);
|
|
const struct tcp_sock *tp = tcp_sk(sp);
|
|
const struct inet_connection_sock *icsk = inet_csk(sp);
|
|
const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq;
|
|
int rx_queue;
|
|
int state;
|
|
|
|
dest = &sp->sk_v6_daddr;
|
|
src = &sp->sk_v6_rcv_saddr;
|
|
destp = ntohs(inet->inet_dport);
|
|
srcp = ntohs(inet->inet_sport);
|
|
|
|
if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
|
|
icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
|
|
icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
|
|
timer_active = 1;
|
|
timer_expires = icsk->icsk_timeout;
|
|
} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
|
|
timer_active = 4;
|
|
timer_expires = icsk->icsk_timeout;
|
|
} else if (timer_pending(&sp->sk_timer)) {
|
|
timer_active = 2;
|
|
timer_expires = sp->sk_timer.expires;
|
|
} else {
|
|
timer_active = 0;
|
|
timer_expires = jiffies;
|
|
}
|
|
|
|
state = inet_sk_state_load(sp);
|
|
if (state == TCP_LISTEN)
|
|
rx_queue = READ_ONCE(sp->sk_ack_backlog);
|
|
else
|
|
/* Because we don't lock the socket,
|
|
* we might find a transient negative value.
|
|
*/
|
|
rx_queue = max_t(int, READ_ONCE(tp->rcv_nxt) -
|
|
READ_ONCE(tp->copied_seq), 0);
|
|
|
|
seq_printf(seq,
|
|
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
|
"%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n",
|
|
i,
|
|
src->s6_addr32[0], src->s6_addr32[1],
|
|
src->s6_addr32[2], src->s6_addr32[3], srcp,
|
|
dest->s6_addr32[0], dest->s6_addr32[1],
|
|
dest->s6_addr32[2], dest->s6_addr32[3], destp,
|
|
state,
|
|
READ_ONCE(tp->write_seq) - tp->snd_una,
|
|
rx_queue,
|
|
timer_active,
|
|
jiffies_delta_to_clock_t(timer_expires - jiffies),
|
|
icsk->icsk_retransmits,
|
|
from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
|
|
icsk->icsk_probes_out,
|
|
sock_i_ino(sp),
|
|
refcount_read(&sp->sk_refcnt), sp,
|
|
jiffies_to_clock_t(icsk->icsk_rto),
|
|
jiffies_to_clock_t(icsk->icsk_ack.ato),
|
|
(icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sp),
|
|
tcp_snd_cwnd(tp),
|
|
state == TCP_LISTEN ?
|
|
fastopenq->max_qlen :
|
|
(tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)
|
|
);
|
|
}
|
|
|
|
static void get_timewait6_sock(struct seq_file *seq,
|
|
struct inet_timewait_sock *tw, int i)
|
|
{
|
|
long delta = tw->tw_timer.expires - jiffies;
|
|
const struct in6_addr *dest, *src;
|
|
__u16 destp, srcp;
|
|
|
|
dest = &tw->tw_v6_daddr;
|
|
src = &tw->tw_v6_rcv_saddr;
|
|
destp = ntohs(tw->tw_dport);
|
|
srcp = ntohs(tw->tw_sport);
|
|
|
|
seq_printf(seq,
|
|
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
|
"%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
|
|
i,
|
|
src->s6_addr32[0], src->s6_addr32[1],
|
|
src->s6_addr32[2], src->s6_addr32[3], srcp,
|
|
dest->s6_addr32[0], dest->s6_addr32[1],
|
|
dest->s6_addr32[2], dest->s6_addr32[3], destp,
|
|
tw->tw_substate, 0, 0,
|
|
3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0,
|
|
refcount_read(&tw->tw_refcnt), tw);
|
|
}
|
|
|
|
static int tcp6_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct tcp_iter_state *st;
|
|
struct sock *sk = v;
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(seq,
|
|
" sl "
|
|
"local_address "
|
|
"remote_address "
|
|
"st tx_queue rx_queue tr tm->when retrnsmt"
|
|
" uid timeout inode\n");
|
|
goto out;
|
|
}
|
|
st = seq->private;
|
|
|
|
if (sk->sk_state == TCP_TIME_WAIT)
|
|
get_timewait6_sock(seq, v, st->num);
|
|
else if (sk->sk_state == TCP_NEW_SYN_RECV)
|
|
get_openreq6(seq, v, st->num);
|
|
else
|
|
get_tcp6_sock(seq, v, st->num);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations tcp6_seq_ops = {
|
|
.show = tcp6_seq_show,
|
|
.start = tcp_seq_start,
|
|
.next = tcp_seq_next,
|
|
.stop = tcp_seq_stop,
|
|
};
|
|
|
|
static struct tcp_seq_afinfo tcp6_seq_afinfo = {
|
|
.family = AF_INET6,
|
|
};
|
|
|
|
int __net_init tcp6_proc_init(struct net *net)
|
|
{
|
|
if (!proc_create_net_data("tcp6", 0444, net->proc_net, &tcp6_seq_ops,
|
|
sizeof(struct tcp_iter_state), &tcp6_seq_afinfo))
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void tcp6_proc_exit(struct net *net)
|
|
{
|
|
remove_proc_entry("tcp6", net->proc_net);
|
|
}
|
|
#endif
|
|
|
|
struct proto tcpv6_prot = {
|
|
.name = "TCPv6",
|
|
.owner = THIS_MODULE,
|
|
.close = tcp_close,
|
|
.pre_connect = tcp_v6_pre_connect,
|
|
.connect = tcp_v6_connect,
|
|
.disconnect = tcp_disconnect,
|
|
.accept = inet_csk_accept,
|
|
.ioctl = tcp_ioctl,
|
|
.init = tcp_v6_init_sock,
|
|
.destroy = tcp_v6_destroy_sock,
|
|
.shutdown = tcp_shutdown,
|
|
.setsockopt = tcp_setsockopt,
|
|
.getsockopt = tcp_getsockopt,
|
|
.bpf_bypass_getsockopt = tcp_bpf_bypass_getsockopt,
|
|
.keepalive = tcp_set_keepalive,
|
|
.recvmsg = tcp_recvmsg,
|
|
.sendmsg = tcp_sendmsg,
|
|
.sendpage = tcp_sendpage,
|
|
.backlog_rcv = tcp_v6_do_rcv,
|
|
.release_cb = tcp_release_cb,
|
|
.hash = inet6_hash,
|
|
.unhash = inet_unhash,
|
|
.get_port = inet_csk_get_port,
|
|
.put_port = inet_put_port,
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
.psock_update_sk_prot = tcp_bpf_update_proto,
|
|
#endif
|
|
.enter_memory_pressure = tcp_enter_memory_pressure,
|
|
.leave_memory_pressure = tcp_leave_memory_pressure,
|
|
.stream_memory_free = tcp_stream_memory_free,
|
|
.sockets_allocated = &tcp_sockets_allocated,
|
|
|
|
.memory_allocated = &tcp_memory_allocated,
|
|
.per_cpu_fw_alloc = &tcp_memory_per_cpu_fw_alloc,
|
|
|
|
.memory_pressure = &tcp_memory_pressure,
|
|
.orphan_count = &tcp_orphan_count,
|
|
.sysctl_mem = sysctl_tcp_mem,
|
|
.sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem),
|
|
.sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem),
|
|
.max_header = MAX_TCP_HEADER,
|
|
.obj_size = sizeof(struct tcp6_sock),
|
|
.slab_flags = SLAB_TYPESAFE_BY_RCU,
|
|
.twsk_prot = &tcp6_timewait_sock_ops,
|
|
.rsk_prot = &tcp6_request_sock_ops,
|
|
.h.hashinfo = NULL,
|
|
.no_autobind = true,
|
|
.diag_destroy = tcp_abort,
|
|
};
|
|
EXPORT_SYMBOL_GPL(tcpv6_prot);
|
|
|
|
static const struct inet6_protocol tcpv6_protocol = {
|
|
.handler = tcp_v6_rcv,
|
|
.err_handler = tcp_v6_err,
|
|
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
|
|
};
|
|
|
|
static struct inet_protosw tcpv6_protosw = {
|
|
.type = SOCK_STREAM,
|
|
.protocol = IPPROTO_TCP,
|
|
.prot = &tcpv6_prot,
|
|
.ops = &inet6_stream_ops,
|
|
.flags = INET_PROTOSW_PERMANENT |
|
|
INET_PROTOSW_ICSK,
|
|
};
|
|
|
|
static int __net_init tcpv6_net_init(struct net *net)
|
|
{
|
|
return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
|
|
SOCK_RAW, IPPROTO_TCP, net);
|
|
}
|
|
|
|
static void __net_exit tcpv6_net_exit(struct net *net)
|
|
{
|
|
inet_ctl_sock_destroy(net->ipv6.tcp_sk);
|
|
}
|
|
|
|
static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
|
|
{
|
|
tcp_twsk_purge(net_exit_list, AF_INET6);
|
|
}
|
|
|
|
static struct pernet_operations tcpv6_net_ops = {
|
|
.init = tcpv6_net_init,
|
|
.exit = tcpv6_net_exit,
|
|
.exit_batch = tcpv6_net_exit_batch,
|
|
};
|
|
|
|
int __init tcpv6_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* register inet6 protocol */
|
|
ret = inet6_register_protosw(&tcpv6_protosw);
|
|
if (ret)
|
|
goto out_tcpv6_protocol;
|
|
|
|
ret = register_pernet_subsys(&tcpv6_net_ops);
|
|
if (ret)
|
|
goto out_tcpv6_protosw;
|
|
|
|
ret = mptcpv6_init();
|
|
if (ret)
|
|
goto out_tcpv6_pernet_subsys;
|
|
|
|
out:
|
|
return ret;
|
|
|
|
out_tcpv6_pernet_subsys:
|
|
unregister_pernet_subsys(&tcpv6_net_ops);
|
|
out_tcpv6_protosw:
|
|
inet6_unregister_protosw(&tcpv6_protosw);
|
|
out_tcpv6_protocol:
|
|
inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
|
|
goto out;
|
|
}
|
|
|
|
void tcpv6_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&tcpv6_net_ops);
|
|
inet6_unregister_protosw(&tcpv6_protosw);
|
|
inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
|
|
}
|