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Wed, 03 Feb 2021 13:37:37 -0800 (PST) Date: Wed, 3 Feb 2021 13:37:28 -0800 In-Reply-To: <20210203213729.1940893-1-dje@google.com> Message-Id: <20210203213729.1940893-2-dje@google.com> Mime-Version: 1.0 References: <20210203213729.1940893-1-dje@google.com> X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog Subject: [PATCH v2 1/2] net/slirp.c: Refactor address parsing To: qemu-devel@nongnu.org Cc: Samuel Thibault , Doug Evans Received-SPF: pass client-ip=2607:f8b0:4864:20::949; envelope-from=3oRcbYAMKCkQjpkmuumrk.iuswks0-jk1krtutmt0.uxm@flex--dje.bounces.google.com; helo=mail-ua1-x949.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 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Reply-to: Doug Evans X-Patchwork-Original-From: dje--- via From: "Zhijian Li (Fujitsu)\" via" ... in preparation for adding ipv6 host forwarding support. Reviewed-by: Samuel Thibault --- net/slirp.c | 200 +++++++++++++++++++++++++++++++++------------------- slirp | 2 +- 2 files changed, 130 insertions(+), 72 deletions(-) diff --git a/net/slirp.c b/net/slirp.c index be914c0be0..a21a313302 100644 --- a/net/slirp.c +++ b/net/slirp.c @@ -631,15 +631,83 @@ static SlirpState *slirp_lookup(Monitor *mon, const char *id) } } -void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) +/* + * Parse a protocol name of the form "name". + * Valid protocols are "tcp" and "udp". An empty string means "tcp". + * Returns a pointer to the end of the parsed string on success, and stores + * the result in *is_udp. + * Otherwise returns NULL and stores the error message in *errmsg, which must + * be freed by the caller. + */ +static const char *parse_protocol(const char *str, int sep, int *is_udp, + char **errmsg) +{ + char buf[10]; + const char *p = str; + + if (get_str_sep(buf, sizeof(buf), &p, sep) < 0) { + *errmsg = g_strdup("Missing protcol name separator"); + return NULL; + } + + if (!strcmp(buf, "tcp") || buf[0] == '\0') { + *is_udp = 0; + } else if (!strcmp(buf, "udp")) { + *is_udp = 1; + } else { + *errmsg = g_strdup("Bad protcol name"); + return NULL; + } + + return p; +} + +/* + * Parse an ipv4 address/port of the form "addrport". + * "kind" is either "host" or "guest" and is included in error messages. + * 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. + * Otherwise returns NULL and stores the error message in *errmsg, which must + * be freed by the caller. + */ +static const char *parse_in4_addr_port(const char *str, const char *kind, + int addr_sep, int port_sep, + struct in_addr *addr, int *port, + char **errmsg) { - struct in_addr host_addr = { .s_addr = INADDR_ANY }; - int host_port; char buf[256]; - const char *src_str, *p; + const char *p = str; + + if (get_str_sep(buf, sizeof(buf), &p, addr_sep) < 0) { + *errmsg = g_strdup_printf("Missing %s address separator", kind); + return NULL; + } + if (buf[0] == '\0') { + addr->s_addr = INADDR_ANY; + } else if (!inet_aton(buf, addr)) { + *errmsg = g_strdup_printf("Bad %s address", kind); + return NULL; + } + + if (get_str_sep(buf, sizeof(buf), &p, port_sep) < 0) { + *errmsg = g_strdup_printf("Missing %s port separator", kind); + return NULL; + } + if (qemu_strtoi(buf, NULL, 10, port) < 0 || + *port < 0 || *port > 65535) { + *errmsg = g_strdup_printf("Bad %s port", kind); + return NULL; + } + + return p; +} + +static void hmp_hostfwd_remove_worker(Monitor *mon, const QDict *qdict, + int family) +{ + const char *src_str; SlirpState *s; - int is_udp = 0; - int err; const char *arg1 = qdict_get_str(qdict, "arg1"); const char *arg2 = qdict_get_try_str(qdict, "arg2"); @@ -654,38 +722,42 @@ void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) return; } - p = src_str; - if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - goto fail_syntax; - } + int host_port; + int is_udp; + char *errmsg = NULL; + int err; - if (!strcmp(buf, "tcp") || buf[0] == '\0') { - is_udp = 0; - } else if (!strcmp(buf, "udp")) { - is_udp = 1; - } else { - goto fail_syntax; - } + g_assert(src_str != NULL); + const char *p = src_str; - if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - goto fail_syntax; - } - if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { + p = parse_protocol(p, ':', &is_udp, &errmsg); + if (p == NULL) { goto fail_syntax; } - if (qemu_strtoi(p, NULL, 10, &host_port)) { - goto fail_syntax; + if (family == AF_INET) { + struct in_addr host_addr; + if (parse_in4_addr_port(p, "host", ':', '\0', &host_addr, &host_port, + &errmsg) == NULL) { + goto fail_syntax; + } + err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); + } else { + g_assert_not_reached(); } - err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); - monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, err ? "not found" : "removed"); return; fail_syntax: - monitor_printf(mon, "invalid format\n"); + monitor_printf(mon, "Invalid format: %s\n", errmsg); + g_free(errmsg); +} + +void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) +{ + hmp_hostfwd_remove_worker(mon, qdict, AF_INET); } static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) @@ -694,56 +766,29 @@ static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) struct in_addr guest_addr = { .s_addr = 0 }; int host_port, guest_port; const char *p; - char buf[256]; int is_udp; - char *end; - const char *fail_reason = "Unknown reason"; + char *errmsg = NULL; + g_assert(redir_str != NULL); p = redir_str; - if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - fail_reason = "No : separators"; - goto fail_syntax; - } - if (!strcmp(buf, "tcp") || buf[0] == '\0') { - is_udp = 0; - } else if (!strcmp(buf, "udp")) { - is_udp = 1; - } else { - fail_reason = "Bad protocol name"; - goto fail_syntax; - } - if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - fail_reason = "Missing : separator"; - goto fail_syntax; - } - if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { - fail_reason = "Bad host address"; + p = parse_protocol(p, ':', &is_udp, &errmsg); + if (p == NULL) { goto fail_syntax; } - if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { - fail_reason = "Bad host port separator"; - goto fail_syntax; - } - host_port = strtol(buf, &end, 0); - if (*end != '\0' || host_port < 0 || host_port > 65535) { - fail_reason = "Bad host port"; + p = parse_in4_addr_port(p, "host", ':', '-', &host_addr, &host_port, + &errmsg); + if (p == NULL) { goto fail_syntax; } - if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - fail_reason = "Missing guest address"; + if (parse_in4_addr_port(p, "guest", ':', '\0', &guest_addr, &guest_port, + &errmsg) == NULL) { goto fail_syntax; } - if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { - fail_reason = "Bad guest address"; - goto fail_syntax; - } - - guest_port = strtol(p, &end, 0); - if (*end != '\0' || guest_port < 1 || guest_port > 65535) { - fail_reason = "Bad guest port"; + if (guest_port == 0) { + errmsg = g_strdup("Bad guest port"); goto fail_syntax; } @@ -757,11 +802,12 @@ static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) fail_syntax: error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, - fail_reason); + errmsg); + g_free(errmsg); return -1; } -void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) +static void hmp_hostfwd_add_worker(Monitor *mon, const QDict *qdict, int family) { const char *redir_str; SlirpState *s; @@ -775,13 +821,25 @@ void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) s = slirp_lookup(mon, NULL); redir_str = arg1; } - if (s) { - Error *err = NULL; - if (slirp_hostfwd(s, redir_str, &err) < 0) { - error_report_err(err); - } + if (!s) { + return; } + Error *err = NULL; + int rc; + if (family == AF_INET) { + rc = slirp_hostfwd(s, redir_str, &err); + } else { + g_assert_not_reached(); + } + if (rc < 0) { + error_report_err(err); + } +} + +void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) +{ + hmp_hostfwd_add_worker(mon, qdict, AF_INET); } #ifndef _WIN32 diff --git a/slirp b/slirp index 8f43a99191..358c0827d4 160000 --- a/slirp +++ b/slirp @@ -1 +1 @@ -Subproject commit 8f43a99191afb47ca3f3c6972f6306209f367ece +Subproject commit 358c0827d49778f016312bfb4167fe639900681f From patchwork Wed Feb 3 21:37:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhijian Li (Fujitsu)\" via" X-Patchwork-Id: 12065401 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 780E2C433DB for ; Wed, 3 Feb 2021 21:40:44 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C65D264F46 for ; 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Wed, 03 Feb 2021 13:37:39 -0800 (PST) Date: Wed, 3 Feb 2021 13:37:29 -0800 In-Reply-To: <20210203213729.1940893-1-dje@google.com> Message-Id: <20210203213729.1940893-3-dje@google.com> Mime-Version: 1.0 References: <20210203213729.1940893-1-dje@google.com> X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog Subject: [PATCH v2 2/2] net: Add -ipv6-hostfwd option, ipv6_hostfwd_add/remove commands To: qemu-devel@nongnu.org Cc: Samuel Thibault , Doug Evans Received-SPF: pass client-ip=2607:f8b0:4864:20::44a; envelope-from=3oxcbYAMKCkYlrmowwotm.kwuymu2-lm3mtvwvov2.wzo@flex--dje.bounces.google.com; helo=mail-pf1-x44a.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 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Reply-to: Doug Evans X-Patchwork-Original-From: dje--- via From: "Zhijian Li (Fujitsu)\" via" These are identical to their ipv4 counterparts, but for ipv6. Signed-off-by: Doug Evans --- hmp-commands.hx | 28 ++++++++++ include/net/slirp.h | 2 + net/slirp.c | 129 +++++++++++++++++++++++++++++++++++++++++++- qapi/net.json | 4 ++ 4 files changed, 161 insertions(+), 2 deletions(-) diff --git a/hmp-commands.hx b/hmp-commands.hx index d4001f9c5d..bd51173472 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1392,6 +1392,34 @@ SRST Remove host-to-guest TCP or UDP redirection. ERST +#ifdef CONFIG_SLIRP + { + .name = "ipv6_hostfwd_add", + .args_type = "arg1:s,arg2:s?", + .params = "[netdev_id] [tcp|udp]:[hostaddr6]:hostport-[guestaddr6]:guestport", + .help = "redirect TCP6 or UDP6 connections from host to guest (requires -net user)", + .cmd = hmp_ipv6_hostfwd_add, + }, +#endif +SRST +``ipv6_hostfwd_add`` + Redirect TCP6 or UDP6 connections from host to guest (requires -net user). +ERST + +#ifdef CONFIG_SLIRP + { + .name = "ipv6_hostfwd_remove", + .args_type = "arg1:s,arg2:s?", + .params = "[netdev_id] [tcp|udp]:[hostaddr6]:hostport", + .help = "remove host-to-guest TCP6 or UDP6 redirection", + .cmd = hmp_ipv6_hostfwd_remove, + }, +#endif +SRST +``ipv6_hostfwd_remove`` + Remove host-to-guest TCP6 or UDP6 redirection. +ERST + { .name = "balloon", .args_type = "value:M", diff --git a/include/net/slirp.h b/include/net/slirp.h index bad3e1e241..4796a5cd39 100644 --- a/include/net/slirp.h +++ b/include/net/slirp.h @@ -29,6 +29,8 @@ void hmp_hostfwd_add(Monitor *mon, const QDict *qdict); void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict); +void hmp_ipv6_hostfwd_add(Monitor *mon, const QDict *qdict); +void hmp_ipv6_hostfwd_remove(Monitor *mon, const QDict *qdict); void hmp_info_usernet(Monitor *mon, const QDict *qdict); diff --git a/net/slirp.c b/net/slirp.c index a21a313302..2482dbd36c 100644 --- a/net/slirp.c +++ b/net/slirp.c @@ -70,6 +70,7 @@ static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) /* slirp network adapter */ #define SLIRP_CFG_HOSTFWD 1 +#define SLIRP_CFG_IPV6_HOSTFWD 2 struct slirp_config_str { struct slirp_config_str *next; @@ -101,6 +102,8 @@ static QTAILQ_HEAD(, SlirpState) slirp_stacks = QTAILQ_HEAD_INITIALIZER(slirp_stacks); static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp); +static int slirp_ipv6_hostfwd(SlirpState *s, const char *redir_str, + Error **errp); static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp); #ifndef _WIN32 @@ -586,6 +589,10 @@ static int net_slirp_init(NetClientState *peer, const char *model, if (slirp_hostfwd(s, config->str, errp) < 0) { goto error; } + } else if (config->flags & SLIRP_CFG_IPV6_HOSTFWD) { + if (slirp_ipv6_hostfwd(s, config->str, errp) < 0) { + goto error; + } } else { if (slirp_guestfwd(s, config->str, errp) < 0) { goto error; @@ -703,6 +710,59 @@ static const char *parse_in4_addr_port(const char *str, const char *kind, return p; } +/* + * Parse an ipv6 address/port of the form "addrport". + * "kind" is either "host" or "guest" and is included in error messages. + * An empty address means in6addr_any. + * Returns a pointer to the end of the parsed string on success, and stores + * the results in *addr, *port. + * Otherwise returns NULL and stores the error message in *errmsg, which must + * be freed by the caller. + */ +static const char *parse_in6_addr_port(const char *str, const char *kind, + int addr_sep, int port_sep, + struct in6_addr *addr, int *port, + char **errmsg) +{ + char buf[256]; + const char *p = str; + + if (*(p++) != '[') { + *errmsg = g_strdup_printf("IPv6 %s address must be enclosed" + " in square brackets", kind); + return NULL; + } + if (get_str_sep(buf, sizeof(buf), &p, ']') < 0) { + *errmsg = g_strdup_printf("IPv6 %s address must be enclosed" + " in square brackets", kind); + return NULL; + } + if (buf[0] == '\0') { + *addr = in6addr_any; + } else if (!inet_pton(AF_INET6, buf, addr)) { + *errmsg = g_strdup_printf("Bad %s address", kind); + return NULL; + } + + /* Ignore the part between the ']' and addr_sep. */ + if (get_str_sep(buf, sizeof(buf), &p, addr_sep) < 0) { + *errmsg = g_strdup_printf("Missing %s address separator", kind); + return NULL; + } + + if (get_str_sep(buf, sizeof(buf), &p, port_sep) < 0) { + *errmsg = g_strdup_printf("Missing %s port separator", kind); + return NULL; + } + if (qemu_strtoi(buf, NULL, 10, port) < 0 || + *port < 0 || *port > 65535) { + *errmsg = g_strdup_printf("Bad %s port", kind); + return NULL; + } + + return p; +} + static void hmp_hostfwd_remove_worker(Monitor *mon, const QDict *qdict, int family) { @@ -743,7 +803,12 @@ static void hmp_hostfwd_remove_worker(Monitor *mon, const QDict *qdict, } err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); } else { - g_assert_not_reached(); + struct in6_addr host_addr; + if (parse_in6_addr_port(p, "host", ':', '\0', &host_addr, &host_port, + &errmsg) == NULL) { + goto fail_syntax; + } + err = slirp_remove_ipv6_hostfwd(s->slirp, is_udp, host_addr, host_port); } monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, @@ -760,6 +825,11 @@ void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) hmp_hostfwd_remove_worker(mon, qdict, AF_INET); } +void hmp_ipv6_hostfwd_remove(Monitor *mon, const QDict *qdict) +{ + hmp_hostfwd_remove_worker(mon, qdict, AF_INET6); +} + static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) { struct in_addr host_addr = { .s_addr = INADDR_ANY }; @@ -807,6 +877,55 @@ static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) return -1; } +static int slirp_ipv6_hostfwd(SlirpState *s, const char *redir_str, + Error **errp) +{ + struct in6_addr host_addr = in6addr_any; + struct in6_addr guest_addr; + int host_port, guest_port; + const char *p; + int is_udp; + char *errmsg = NULL; + + memset(&guest_addr, 0, sizeof(guest_addr)); + g_assert(redir_str != NULL); + p = redir_str; + + p = parse_protocol(p, ':', &is_udp, &errmsg); + if (p == NULL) { + goto fail_syntax; + } + + p = parse_in6_addr_port(p, "host", ':', '-', &host_addr, &host_port, + &errmsg); + if (p == NULL) { + goto fail_syntax; + } + + if (parse_in6_addr_port(p, "guest", ':', '\0', &guest_addr, &guest_port, + &errmsg) == NULL) { + goto fail_syntax; + } + if (guest_port == 0) { + errmsg = g_strdup("Bad guest port"); + goto fail_syntax; + } + + if (slirp_add_ipv6_hostfwd(s->slirp, is_udp, host_addr, host_port, + guest_addr, guest_port) < 0) { + error_setg(errp, "Could not set up host forwarding rule '%s'", + redir_str); + return -1; + } + return 0; + + fail_syntax: + error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, + errmsg); + g_free(errmsg); + return -1; +} + static void hmp_hostfwd_add_worker(Monitor *mon, const QDict *qdict, int family) { const char *redir_str; @@ -830,7 +949,7 @@ static void hmp_hostfwd_add_worker(Monitor *mon, const QDict *qdict, int family) if (family == AF_INET) { rc = slirp_hostfwd(s, redir_str, &err); } else { - g_assert_not_reached(); + rc = slirp_ipv6_hostfwd(s, redir_str, &err); } if (rc < 0) { error_report_err(err); @@ -842,6 +961,11 @@ void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) hmp_hostfwd_add_worker(mon, qdict, AF_INET); } +void hmp_ipv6_hostfwd_add(Monitor *mon, const QDict *qdict) +{ + hmp_hostfwd_add_worker(mon, qdict, AF_INET6); +} + #ifndef _WIN32 /* automatic user mode samba server configuration */ @@ -1148,6 +1272,7 @@ int net_init_slirp(const Netdev *netdev, const char *name, /* all optional fields are initialized to "all bits zero" */ net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); + net_init_slirp_configs(user->ipv6_hostfwd, SLIRP_CFG_IPV6_HOSTFWD); net_init_slirp_configs(user->guestfwd, 0); ret = net_slirp_init(peer, "user", name, user->q_restrict, diff --git a/qapi/net.json b/qapi/net.json index c31748c87f..443473107a 100644 --- a/qapi/net.json +++ b/qapi/net.json @@ -161,6 +161,9 @@ # @hostfwd: redirect incoming TCP or UDP host connections to guest # endpoints # +# @ipv6-hostfwd: redirect incoming IPV6 TCP or UDP host connections to +# guest endpoints (since 6.0) +# # @guestfwd: forward guest TCP connections # # @tftp-server-name: RFC2132 "TFTP server name" string (Since 3.1) @@ -189,6 +192,7 @@ '*smb': 'str', '*smbserver': 'str', '*hostfwd': ['String'], + '*ipv6-hostfwd': ['String'], '*guestfwd': ['String'], '*tftp-server-name': 'str' } }