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iscsi-target: ST response on IN6ADDR_ANY socket
Odd little issue, found that if you create an IPv6 portal bound to the IN6ADDR_ANY wildcard address it will accept IPv4 connections (as long as bindv6only isn't set globally) but respond to SendTargets requests with an IPv4-mapped IPv6 address. Example over loopback: In targetcli create a wildcard IPv6 portal /iscsi/iqn.../portals/> create :: Which should create a portal [::]:3260 Initiate SendTargets discovery to the portal using an IPv4 address # iscsiadm -m discovery -t st -p 127.0.0.1 The response formats TargetAddress as [::ffff:127.0.0.1]:3260,1 This still works and uses v4 on the network between two v6 sockets, but only if the initiator supports IPv6 with v4-mapped addresses. This change detects v4-mapped address on v6 sockets for the wildcard case, and instead formats the TargetAddress response as an IPv4 address. In order to not further complicate iscsit_build_sendtargets_response, I've actually simplified it by moving the bracket wrapping of IPv6 address into iscsit_accept_np where local_ip and login_ip strings are set. That also simplifies iscsi_stat_tgt_attr_show_attr_fail_intr_addr. Side effect of the string format change is that lio_target_nacl_show_info will now print login_ip bracket wrapped for IPv6 connections, as will a few debug prints. Signed-off-by: Chris Leech <cleech@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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parent
de04a8aa6b
commit
dfecf611a1
3 changed files with 16 additions and 16 deletions
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@ -3444,12 +3444,10 @@ static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
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bool inaddr_any = iscsit_check_inaddr_any(np);
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len = sprintf(buf, "TargetAddress="
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"%s%s%s:%hu,%hu",
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(np->np_sockaddr.ss_family == AF_INET6) ?
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"[" : "", (inaddr_any == false) ?
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"%s:%hu,%hu",
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(inaddr_any == false) ?
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np->np_ip : conn->local_ip,
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(np->np_sockaddr.ss_family == AF_INET6) ?
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"]" : "", (inaddr_any == false) ?
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(inaddr_any == false) ?
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np->np_port : conn->local_port,
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tpg->tpgt);
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len += 1;
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@ -1007,16 +1007,24 @@ int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
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rc = conn->sock->ops->getname(conn->sock,
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(struct sockaddr *)&sock_in6, &err, 1);
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if (!rc) {
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snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
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if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
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snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
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&sock_in6.sin6_addr.in6_u);
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else
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snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
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&sock_in6.sin6_addr.s6_addr32[3]);
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conn->login_port = ntohs(sock_in6.sin6_port);
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}
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rc = conn->sock->ops->getname(conn->sock,
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(struct sockaddr *)&sock_in6, &err, 0);
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if (!rc) {
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snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
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if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
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snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
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&sock_in6.sin6_addr.in6_u);
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else
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snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
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&sock_in6.sin6_addr.s6_addr32[3]);
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conn->local_port = ntohs(sock_in6.sin6_port);
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}
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} else {
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@ -432,13 +432,7 @@ static ssize_t iscsi_stat_tgt_attr_show_attr_fail_intr_addr(
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int ret;
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spin_lock(&lstat->lock);
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if (lstat->last_intr_fail_ip_family == AF_INET6) {
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ret = snprintf(page, PAGE_SIZE, "[%s]\n",
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lstat->last_intr_fail_ip_addr);
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} else {
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ret = snprintf(page, PAGE_SIZE, "%s\n",
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lstat->last_intr_fail_ip_addr);
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}
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ret = snprintf(page, PAGE_SIZE, "%s\n", lstat->last_intr_fail_ip_addr);
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spin_unlock(&lstat->lock);
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return ret;
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