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eb91f914b9
Fixes #25801. Adds the following commits to fix DHCP behaviour on Strongswan 5.9.14: -abbf9d28b0-00d8c36d6f-a50ed3006eSigned-off-by: Joel Low <joel@joelsplace.sg>
67 lines
2.7 KiB
Diff
67 lines
2.7 KiB
Diff
From a50ed3006e8152eb2cf20e9f92f088ecc18081b0 Mon Sep 17 00:00:00 2001
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From: Tobias Brunner <tobias@strongswan.org>
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Date: Wed, 29 Jan 2025 17:23:31 +0100
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Subject: [PATCH 3/3] dhcp: Add option to bind the receive socket to a
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different interface
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This can be useful if the DHCP server runs on the same server. On Linux,
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the response is then sent via `lo`, so packets won't be received if both
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sockets are bound to e.g. a bridge interface.
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---
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conf/plugins/dhcp.opt | 10 ++++++++++
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src/libcharon/plugins/dhcp/dhcp_socket.c | 13 ++++++++-----
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2 files changed, 18 insertions(+), 5 deletions(-)
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--- a/conf/plugins/dhcp.opt
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+++ b/conf/plugins/dhcp.opt
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@@ -36,3 +36,13 @@ charon.plugins.dhcp.interface
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Interface name the plugin uses for address allocation. The default is to
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bind to any (0.0.0.0) and let the system decide which way to route the
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packets to the DHCP server.
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+
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+charon.plugins.dhcp.interface_receive = charon.plugins.dhcp.interface
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+ Interface name the plugin uses to bind its receive socket.
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+
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+ Interface name the plugin uses to bind its receive socket. The default is
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+ to use the same interface as the send socket. Set it to the empty string
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+ to avoid binding the receive socket to any interface while the send socket
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+ is bound to one. If the server runs on the same host and the send socket is
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+ bound to an interface, it might be necessary to set this to `lo` or the
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+ empty string.
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--- a/src/libcharon/plugins/dhcp/dhcp_socket.c
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+++ b/src/libcharon/plugins/dhcp/dhcp_socket.c
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@@ -716,7 +716,7 @@ dhcp_socket_t *dhcp_socket_create()
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},
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};
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socklen_t addr_len;
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- char *iface;
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+ char *iface, *iface_receive;
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int on = 1, rcvbuf = 0;
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#if !defined(__APPLE__) && !defined(__FreeBSD__)
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@@ -809,8 +809,11 @@ dhcp_socket_t *dhcp_socket_create()
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this->dst = host_create_from_string(lib->settings->get_str(lib->settings,
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"%s.plugins.dhcp.server", "255.255.255.255",
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lib->ns), DHCP_SERVER_PORT);
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- iface = lib->settings->get_str(lib->settings, "%s.plugins.dhcp.interface",
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- NULL, lib->ns);
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+ iface = lib->settings->get_str(lib->settings,
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+ "%s.plugins.dhcp.interface", NULL, lib->ns);
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+ iface_receive = lib->settings->get_str(lib->settings,
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+ "%s.plugins.dhcp.interface_receive", NULL,
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+ lib->ns) ?: iface;
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if (!this->dst)
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{
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DBG1(DBG_CFG, "configured DHCP server address invalid");
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@@ -873,8 +876,8 @@ dhcp_socket_t *dhcp_socket_create()
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return NULL;
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}
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- this->pf_handler = pf_handler_create("DHCP", iface, receive_dhcp, this,
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- &dhcp_filter);
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+ this->pf_handler = pf_handler_create("DHCP", iface_receive, receive_dhcp,
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+ this, &dhcp_filter);
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if (!this->pf_handler)
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{
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destroy(this);
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