[v4,4/4] net: Extend host forwarding to support IPv6

Message ID	20210218201538.701509-5-dje@google.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=6iCp=HU=nongnu.org=qemu-devel-bounces+qemu-devel=archiver.kernel.org@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5CF5A64E4B Date: Thu, 18 Feb 2021 12:15:38 -0800 In-Reply-To: <20210218201538.701509-1-dje@google.com> Message-Id: <20210218201538.701509-5-dje@google.com> Mime-Version: 1.0 References: <20210218201538.701509-1-dje@google.com> Subject: [PATCH v4 4/4] net: Extend host forwarding to support IPv6 To: qemu-devel@nongnu.org Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>, " =?utf-8?q?Daniel_P_?= =?utf-8?q?=2E_Berrang=C3=A9?= " <berrange@redhat.com>, Doug Evans <dje@google.com> Content-Type: text/plain; charset="UTF-8" Received-SPF: pass client-ip=2607:f8b0:4864:20::549; envelope-from=3-8ouYAMKClQz502AA270.yA8C08G-z0H079A929G.AD2@flex--dje.bounces.google.com; helo=mail-pg1-x549.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action Precedence: list Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" <qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org> Reply-to: Doug Evans <dje@google.com> From: Doug Evans via <qemu-devel@nongnu.org>
Series	Add support for ipv6 host forwarding \| expand [v4,0/4] Add support for ipv6 host forwarding [v4,1/4] slirp: Advance libslirp submodule to add ipv6 host-forward support [v4,2/4] util/qemu-sockets.c: Split host:port parsing out of inet_parse [v4,3/4] net/slirp.c: Refactor address parsing [v4,4/4] net: Extend host forwarding to support IPv6

diff --git a/hmp-commands.hx b/hmp-commands.hx index d4001f9c5d..4de4e4979d 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1375,6 +1375,16 @@ ERST SRST ``hostfwd_add`` Redirect TCP or UDP connections from host to guest (requires -net user). + IPV6 addresses are wrapped in square brackes, IPV4 addresses are not. + + Examples: + hostfwd_add net0 tcp:127.0.0.1:10022-:22 + hostfwd_add net0 tcp:[::1]:10022-[fe80::1:2:3:4]:22 + + Note that Libslirp currently only provides a "stateless" DHCPv6 server, a + consequence of which is that it cannot do the "addr-any" translation to the + guest address that is done for IPv4. In other words, the following is + currently not supported: hostfwd_add net0 tcp:[::1]:10022-:22 ERST #ifdef CONFIG_SLIRP @@ -1390,6 +1400,11 @@ ERST SRST ``hostfwd_remove`` Remove host-to-guest TCP or UDP redirection. + IPV6 addresses are wrapped in square brackes, IPV4 addresses are not. + + Examples: + hostfwd_remove net0 tcp:127.0.0.1:10022 + hostfwd_remove net0 tcp:[::1]:10022 ERST { diff --git a/net/slirp.c b/net/slirp.c index ee39014a71..d8c675a2e8 100644 --- a/net/slirp.c +++ b/net/slirp.c @@ -96,6 +96,11 @@ typedef struct SlirpState { GSList *fwd; } SlirpState; +union in4or6_addr { + struct in_addr addr4; + struct in6_addr addr6; +}; + static struct slirp_config_str *slirp_configs; static QTAILQ_HEAD(, SlirpState) slirp_stacks = QTAILQ_HEAD_INITIALIZER(slirp_stacks); @@ -663,31 +668,38 @@ static const char *parse_protocol(const char *str, int sep, bool *is_udp, /* * Parse an ip address/port of the form "address:port<terminator>". - * An empty address means INADDR_ANY. - * Returns a pointer to the end of the parsed string on success, and stores - * the results in *addr, *port. + * An empty address means INADDR_ANY/in6addr_any. + * Returns a pointer to after the terminator, unless it was '\0', and stores + * the results in *addr, *port, *is_v6. * Otherwise returns NULL and stores the error in *errp. */ static const char *parse_ip_addr_and_port(const char *str, int terminator, - struct in_addr *addr, int *port, - Error **errp) + union in4or6_addr *addr, int *port, + bool *is_v6, Error **errp) { g_autofree char *addr_str = NULL; g_autofree char *port_str = NULL; - bool is_v6; const char *p = inet_parse_host_and_port(str, terminator, &addr_str, - &port_str, &is_v6, errp); + &port_str, is_v6, errp); if (p == NULL) { return NULL; } - /* Ignore is_v6 for the moment, if inet_aton fails let it. */ - if (addr_str[0] == '\0') { - addr->s_addr = INADDR_ANY; - } else if (!inet_aton(addr_str, addr)) { - error_setg(errp, "Bad address"); - return NULL; + if (*is_v6) { + if (addr_str[0] == '\0') { + addr->addr6 = in6addr_any; + } else if (!inet_pton(AF_INET6, addr_str, &addr->addr6)) { + error_setg(errp, "Bad address"); + return NULL; + } + } else { + if (addr_str[0] == '\0') { + addr->addr4.s_addr = INADDR_ANY; + } else if (!inet_pton(AF_INET, addr_str, &addr->addr4)) { + error_setg(errp, "Bad address"); + return NULL; + } } if (qemu_strtoi(port_str, NULL, 10, port) < 0 || @@ -708,11 +720,11 @@ static const char *parse_ip_addr_and_port(const char *str, int terminator, void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) { - struct in_addr host_addr; + union in4or6_addr host_addr; int host_port; const char *src_str, *p; SlirpState *s; - bool is_udp; + bool is_udp, is_v6; int err; Error *error = NULL; const char *arg1 = qdict_get_str(qdict, "arg1"); @@ -737,11 +749,18 @@ void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) goto fail_syntax; } - if (parse_ip_addr_and_port(p, '\0', &host_addr, &host_port, + if (parse_ip_addr_and_port(p, '\0', &host_addr, &host_port, &is_v6, &error) == NULL) { goto fail_syntax; } - err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); + + if (is_v6) { + err = slirp_remove_ipv6_hostfwd(s->slirp, is_udp, host_addr.addr6, + host_port); + } else { + err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr.addr4, + host_port); + } monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, err ? "not found" : "removed"); @@ -754,11 +773,12 @@ void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) { - struct in_addr host_addr, guest_addr; + union in4or6_addr host_addr, guest_addr; int host_port, guest_port; const char *p; - bool is_udp; + bool is_udp, host_is_v6, guest_is_v6; Error *error = NULL; + int err; g_assert(redir_str != NULL); p = redir_str; @@ -768,24 +788,36 @@ static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) goto fail_syntax; } - p = parse_ip_addr_and_port(p, '-', &host_addr, &host_port, &error); + p = parse_ip_addr_and_port(p, '-', &host_addr, &host_port, &host_is_v6, + &error); if (p == NULL) { error_prepend(&error, "For host address: "); goto fail_syntax; } - if (parse_ip_addr_and_port(p, '\0', &guest_addr, &guest_port, + if (parse_ip_addr_and_port(p, '\0', &guest_addr, &guest_port, &guest_is_v6, &error) == NULL) { error_prepend(&error, "For guest address: "); goto fail_syntax; } + if (host_is_v6 != guest_is_v6) { + /* TODO: Can libslirp support this? */ + error_setg(&error, "Both host,guest must be one of ipv4 or ipv6"); + goto fail_syntax; + } if (guest_port == 0) { error_setg(&error, "For guest address: Bad port"); goto fail_syntax; } - if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, - guest_port) < 0) { + if (host_is_v6) { + err = slirp_add_ipv6_hostfwd(s->slirp, is_udp, host_addr.addr6, + host_port, guest_addr.addr6, guest_port); + } else { + err = slirp_add_hostfwd(s->slirp, is_udp, host_addr.addr4, host_port, + guest_addr.addr4, guest_port); + } + if (err < 0) { error_setg(errp, "Could not set up host forwarding rule '%s'", redir_str); return -1; diff --git a/tests/acceptance/hostfwd.py b/tests/acceptance/hostfwd.py index 1eaa0371ba..4368d557c9 100644 --- a/tests/acceptance/hostfwd.py +++ b/tests/acceptance/hostfwd.py @@ -82,3 +82,69 @@ def test_qmp_hostfwd_ipv4_parsing_errors(self): "Invalid host forwarding rule '::66-:-1' (For guest address: Bad port)\r\n") self.assertEquals(self.hmc('hostfwd_add ::66-:0'), "Invalid host forwarding rule '::66-:0' (For guest address: Bad port)\r\n") + + def test_qmp_hostfwd_ipv6(self): + self.vm.add_args('-nodefaults', + '-netdev', 'user,id=vnet', + '-device', 'virtio-net,netdev=vnet') + self.vm.launch() + self.assertEquals(self.hmc('hostfwd_add vnet tcp:[::1]:65022-[fe80::1]:22'), + '') + self.assertEquals(self.hmc('hostfwd_remove vnet tcp:[::1]:65022'), + 'host forwarding rule for tcp:[::1]:65022 removed\r\n') + self.assertEquals(self.hmc('hostfwd_add tcp:[]:65042-[fe80::1]:42'), + '') + self.assertEquals(self.hmc('hostfwd_remove tcp:[]:65042'), + 'host forwarding rule for tcp:[]:65042 removed\r\n') + self.assertEquals(self.hmc('hostfwd_add udp:[::1]:65042-[fe80::1]:42'), + '') + self.assertEquals(self.hmc('hostfwd_remove udp:[::1]:65042'), + 'host forwarding rule for udp:[::1]:65042 removed\r\n') + + def test_qmp_hostfwd_ipv6_functional_errors(self): + """Verify handling of various kinds of errors given valid addresses.""" + self.vm.add_args('-nodefaults', + '-netdev', 'user,id=vnet', + '-device', 'virtio-net,netdev=vnet') + self.vm.launch() + self.assertEquals(self.hmc('hostfwd_remove :[::1]:65022'), + 'host forwarding rule for :[::1]:65022 not found\r\n') + self.assertEquals(self.hmc('hostfwd_add udp:[::1]:65042-[fe80::1]:42'), + '') + self.assertEquals(self.hmc('hostfwd_add udp:[::1]:65042-[fe80::1]:42'), + "Could not set up host forwarding rule 'udp:[::1]:65042-[fe80::1]:42'\r\n") + self.assertEquals(self.hmc('hostfwd_remove :[::1]:65042'), + 'host forwarding rule for :[::1]:65042 not found\r\n') + self.assertEquals(self.hmc('hostfwd_remove udp:[::1]:65042'), + 'host forwarding rule for udp:[::1]:65042 removed\r\n') + self.assertEquals(self.hmc('hostfwd_remove udp:[::1]:65042'), + 'host forwarding rule for udp:[::1]:65042 not found\r\n') + + def test_qmp_hostfwd_ipv6_errors(self): + """Verify handling of various kinds of errors.""" + self.vm.add_args('-nodefaults', + '-netdev', 'user,id=vnet', + '-device', 'virtio-net,netdev=vnet') + self.vm.launch() + self.assertEquals(self.hmc('hostfwd_add :[::1-'), + "Invalid host forwarding rule ':[::1-' (For host address: error parsing IPv6 host:port '[::1')\r\n") + self.assertEquals(self.hmc('hostfwd_add :[::1]:66-[fe80::1'), + "Invalid host forwarding rule ':[::1]:66-[fe80::1' (For guest address: error parsing IPv6 host:port '[fe80::1')\r\n") + self.assertEquals(self.hmc('hostfwd_add :[:::]:66-foo'), + "Invalid host forwarding rule ':[:::]:66-foo' (For host address: Bad address)\r\n") + self.assertEquals(self.hmc('hostfwd_add :[::1]-foo'), + "Invalid host forwarding rule ':[::1]-foo' (For host address: error parsing IPv6 host:port '[::1]')\r\n") + self.assertEquals(self.hmc('hostfwd_add :[::1]:66-[foo]'), + "Invalid host forwarding rule ':[::1]:66-[foo]' (For guest address: error parsing IPv6 host:port '[foo]')\r\n") + self.assertEquals(self.hmc('hostfwd_add :[::1]:66666-foo'), + "Invalid host forwarding rule ':[::1]:66666-foo' (For host address: Bad port)\r\n") + self.assertEquals(self.hmc('hostfwd_add :[::1]:66-[fe80::1]:-1'), + "Invalid host forwarding rule ':[::1]:66-[fe80::1]:-1' (For guest address: Bad port)\r\n") + self.assertEquals(self.hmc('hostfwd_add :[::1]:66-[fe80::1]:66666'), + "Invalid host forwarding rule ':[::1]:66-[fe80::1]:66666' (For guest address: Bad port)\r\n") + self.assertEquals(self.hmc('hostfwd_add :[::1]:66-[fe80::1]:0'), + "Invalid host forwarding rule ':[::1]:66-[fe80::1]:0' (For guest address: Bad port)\r\n") + self.assertEquals(self.hmc('hostfwd_add :[::1]:66-1.2.3.4:66'), + "Invalid host forwarding rule ':[::1]:66-1.2.3.4:66' (Both host,guest must be one of ipv4 or ipv6)\r\n") + self.assertEquals(self.hmc('hostfwd_add :1.2.3.4:66-[fe80::1]:66'), + "Invalid host forwarding rule ':1.2.3.4:66-[fe80::1]:66' (Both host,guest must be one of ipv4 or ipv6)\r\n")

[v4,4/4] net: Extend host forwarding to support IPv6

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Patch