ipv4/raw: support binding to nonlocal addresses
Add support to inet v4 raw sockets for binding to nonlocal addresses through the IP_FREEBIND and IP_TRANSPARENT socket options, as well as the ipv4.ip_nonlocal_bind kernel parameter. Add helper function to inet_sock.h to check for bind address validity on the base of the address type and whether nonlocal address are enabled for the socket via any of the sockopts/sysctl, deduplicating checks in ipv4/ping.c, ipv4/af_inet.c, ipv6/af_inet6.c (for mapped v4->v6 addresses), and ipv4/raw.c. Add test cases with IP[V6]_FREEBIND verifying that both v4 and v6 raw sockets support binding to nonlocal addresses after the change. Add necessary support for the test cases to nettest. Signed-off-by: Riccardo Paolo Bestetti <pbl@bestov.io> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20211117090010.125393-1-pbl@bestov.io Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Riccardo Paolo Bestetti
Jakub Kicinski
parent
75082e7f46
commit
8ff978b8b2
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@ -372,4 +372,16 @@ static inline bool inet_can_nonlocal_bind(struct net *net,
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inet->freebind || inet->transparent;
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}
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static inline bool inet_addr_valid_or_nonlocal(struct net *net,
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struct inet_sock *inet,
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__be32 addr,
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int addr_type)
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{
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return inet_can_nonlocal_bind(net, inet) ||
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addr == htonl(INADDR_ANY) ||
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addr_type == RTN_LOCAL ||
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addr_type == RTN_MULTICAST ||
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addr_type == RTN_BROADCAST;
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}
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#endif /* _INET_SOCK_H */
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@ -489,11 +489,8 @@ int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
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* is temporarily down)
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*/
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err = -EADDRNOTAVAIL;
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if (!inet_can_nonlocal_bind(net, inet) &&
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addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
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chk_addr_ret != RTN_LOCAL &&
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chk_addr_ret != RTN_MULTICAST &&
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chk_addr_ret != RTN_BROADCAST)
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if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
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chk_addr_ret))
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goto out;
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snum = ntohs(addr->sin_port);
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@ -311,15 +311,11 @@ static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
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pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
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sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
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if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
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chk_addr_ret = RTN_LOCAL;
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else
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chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
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if ((!inet_can_nonlocal_bind(net, isk) &&
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chk_addr_ret != RTN_LOCAL) ||
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chk_addr_ret == RTN_MULTICAST ||
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chk_addr_ret == RTN_BROADCAST)
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if (!inet_addr_valid_or_nonlocal(net, inet_sk(sk),
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addr->sin_addr.s_addr,
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chk_addr_ret))
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return -EADDRNOTAVAIL;
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#if IS_ENABLED(CONFIG_IPV6)
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@ -717,6 +717,7 @@ static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
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struct net *net = sock_net(sk);
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u32 tb_id = RT_TABLE_LOCAL;
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int ret = -EINVAL;
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int chk_addr_ret;
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@ -725,16 +726,16 @@ static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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goto out;
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if (sk->sk_bound_dev_if)
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tb_id = l3mdev_fib_table_by_index(sock_net(sk),
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tb_id = l3mdev_fib_table_by_index(net,
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sk->sk_bound_dev_if) ? : tb_id;
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chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr,
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tb_id);
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chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
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ret = -EADDRNOTAVAIL;
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if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
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chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
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if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
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chk_addr_ret))
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goto out;
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inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
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if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
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inet->inet_saddr = 0; /* Use device */
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@ -337,11 +337,8 @@ static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
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chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
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rcu_read_unlock();
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if (!inet_can_nonlocal_bind(net, inet) &&
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v4addr != htonl(INADDR_ANY) &&
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chk_addr_ret != RTN_LOCAL &&
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chk_addr_ret != RTN_MULTICAST &&
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chk_addr_ret != RTN_BROADCAST) {
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if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
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chk_addr_ret)) {
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err = -EADDRNOTAVAIL;
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goto out;
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}
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@ -66,6 +66,10 @@ NSB_LO_IP=172.16.2.2
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NSA_LO_IP6=2001:db8:2::1
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NSB_LO_IP6=2001:db8:2::2
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# non-local addresses for freebind tests
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NL_IP=172.17.1.1
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NL_IP6=2001:db8:4::1
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MD5_PW=abc123
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MD5_WRONG_PW=abc1234
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@ -316,6 +320,9 @@ addr2str()
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${NSB_LO_IP6}) echo "ns-B loopback IPv6";;
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${NSB_LINKIP6}|${NSB_LINKIP6}%*) echo "ns-B IPv6 LLA";;
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${NL_IP}) echo "nonlocal IP";;
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${NL_IP6}) echo "nonlocal IPv6";;
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${VRF_IP}) echo "VRF IP";;
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${VRF_IP6}) echo "VRF IPv6";;
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@ -1767,6 +1774,14 @@ ipv4_addr_bind_novrf()
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log_test_addr ${a} $? 0 "Raw socket bind to local address after device bind"
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done
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#
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# raw socket with nonlocal bind
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#
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a=${NL_IP}
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log_start
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run_cmd nettest -s -R -P icmp -f -l ${a} -I ${NSA_DEV} -b
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log_test_addr ${a} $? 0 "Raw socket bind to nonlocal address after device bind"
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#
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# tcp sockets
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#
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@ -1815,6 +1830,14 @@ ipv4_addr_bind_vrf()
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run_cmd nettest -s -R -P icmp -l ${a} -I ${VRF} -b
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log_test_addr ${a} $? 1 "Raw socket bind to out of scope address after VRF bind"
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#
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# raw socket with nonlocal bind
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#
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a=${NL_IP}
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log_start
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run_cmd nettest -s -R -P icmp -f -l ${a} -I ${VRF} -b
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log_test_addr ${a} $? 0 "Raw socket bind to nonlocal address after VRF bind"
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#
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# tcp sockets
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#
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@ -1965,6 +1988,7 @@ ipv4_rt()
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a=${NSA_IP}
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log_start
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run_cmd nettest ${varg} -s &
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sleep 1
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run_cmd nettest ${varg} -d ${NSA_DEV} -r ${a} &
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@ -3402,6 +3426,14 @@ ipv6_addr_bind_novrf()
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log_test_addr ${a} $? 0 "Raw socket bind to local address after device bind"
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done
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#
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# raw socket with nonlocal bind
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#
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a=${NL_IP6}
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log_start
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run_cmd nettest -6 -s -R -P icmp -f -l ${a} -I ${NSA_DEV} -b
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log_test_addr ${a} $? 0 "Raw socket bind to nonlocal address"
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#
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# tcp sockets
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#
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@ -3443,6 +3475,14 @@ ipv6_addr_bind_vrf()
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run_cmd nettest -6 -s -R -P ipv6-icmp -l ${a} -I ${VRF} -b
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log_test_addr ${a} $? 1 "Raw socket bind to invalid local address after vrf bind"
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#
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# raw socket with nonlocal bind
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#
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a=${NL_IP6}
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log_start
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run_cmd nettest -6 -s -R -P icmp -f -l ${a} -I ${VRF} -b
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log_test_addr ${a} $? 0 "Raw socket bind to nonlocal address after VRF bind"
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#
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# tcp sockets
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#
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@ -85,6 +85,7 @@ struct sock_args {
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int version; /* AF_INET/AF_INET6 */
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int use_setsockopt;
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int use_freebind;
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int use_cmsg;
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const char *dev;
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const char *server_dev;
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@ -514,6 +515,29 @@ static int set_membership(int sd, uint32_t grp, uint32_t addr, int ifindex)
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return 0;
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}
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static int set_freebind(int sd, int version)
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{
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unsigned int one = 1;
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int rc = 0;
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switch (version) {
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case AF_INET:
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if (setsockopt(sd, SOL_IP, IP_FREEBIND, &one, sizeof(one))) {
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log_err_errno("setsockopt(IP_FREEBIND)");
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rc = -1;
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}
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break;
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case AF_INET6:
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if (setsockopt(sd, SOL_IPV6, IPV6_FREEBIND, &one, sizeof(one))) {
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log_err_errno("setsockopt(IPV6_FREEBIND");
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rc = -1;
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}
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break;
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}
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return rc;
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}
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static int set_broadcast(int sd)
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{
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unsigned int one = 1;
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@ -1419,6 +1443,9 @@ static int lsock_init(struct sock_args *args)
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set_unicast_if(sd, args->ifindex, args->version))
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goto err;
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if (args->use_freebind && set_freebind(sd, args->version))
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goto err;
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if (bind_socket(sd, args))
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goto err;
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@ -1827,7 +1854,7 @@ static int ipc_parent(int cpid, int fd, struct sock_args *args)
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return client_status;
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}
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#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:M:X:m:d:I:BN:O:SCi6xL:0:1:2:3:Fbq"
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#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:M:X:m:d:I:BN:O:SCi6xL:0:1:2:3:Fbqf"
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#define OPT_FORCE_BIND_KEY_IFINDEX 1001
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#define OPT_NO_BIND_KEY_IFINDEX 1002
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@ -1864,6 +1891,7 @@ static void print_usage(char *prog)
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" -I dev bind socket to given device name - server mode\n"
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" -S use setsockopt (IP_UNICAST_IF or IP_MULTICAST_IF)\n"
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" to set device binding\n"
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" -f bind socket with the IP[V6]_FREEBIND option\n"
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" -C use cmsg and IP_PKTINFO to specify device binding\n"
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"\n"
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" -L len send random message of given length\n"
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@ -1999,6 +2027,9 @@ int main(int argc, char *argv[])
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case 'S':
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args.use_setsockopt = 1;
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break;
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case 'f':
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args.use_freebind = 1;
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break;
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case 'C':
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args.use_cmsg = 1;
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break;
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