[strongSwan-dev] [hw-offload-auto-mode v2 2/3] kernel-netlink: Add new hw_offload mode - auto
adin at mellanox.com
adin at mellanox.com
Mon Mar 12 15:34:20 CET 2018
From: Adi Nissim <adin at mellanox.com>
Until now there were 2 hw_offload modes: no/yes
* hw_offload = no : Configure the SA without HW offload.
* hw_offload = yes : Configure the SA with HW offload.
In this case, if the device does not support
offloading, SA creation will fail.
This commit introduces a new mode: hw_offload = auto
----------------------------------------------------
If the device and kernel support HW offload, configure
the SA with HW offload, but do not fail SA creation otherwise.
Signed-off-by: Adi Nissim <adin at mellanox.com>
Reviewed-by: Aviv Heller <avivh at mellanox.com>
---
v1 -> v2:
-Fix the FD leak
---
.../plugins/kernel_netlink/kernel_netlink_ipsec.c | 286 +++++++++++++++++++--
1 file changed, 263 insertions(+), 23 deletions(-)
diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c b/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c
index 4e79dfc..dbeccf8 100644
--- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c
+++ b/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c
@@ -18,15 +18,40 @@
* for more details.
*/
+/*
+ * Copyright (C) 2018 Mellanox Technologies.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/socket.h>
+#include <sys/ioctl.h>
#include <stdint.h>
#include <linux/ipsec.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/xfrm.h>
#include <linux/udp.h>
+#include <linux/ethtool.h>
+#include <linux/sockios.h>
#include <net/if.h>
#include <unistd.h>
#include <time.h>
@@ -237,6 +262,21 @@ static kernel_algorithm_t compression_algs[] = {
};
/**
+ * IPsec offload
+ */
+enum nic_offload_state {
+ NIC_OFFLOAD_UNKNOWN,
+ NIC_OFFLOAD_UNSUPPORTED,
+ NIC_OFFLOAD_SUPPORTED
+};
+
+static struct {
+ unsigned int bit;
+ unsigned int total_blocks;
+ enum nic_offload_state state;
+} netlink_esp_hw_offload;
+
+/**
* Look up a kernel algorithm name and its key size
*/
static const char* lookup_algorithm(transform_type_t type, int ikev2)
@@ -1290,6 +1330,224 @@ static bool add_mark(struct nlmsghdr *hdr, int buflen, mark_t mark)
return TRUE;
}
+/**
+ * check if kernel supported HW offload
+ */
+static void netlink_find_offload_feature(const char *ifname, int fd_for_socket)
+{
+ struct ethtool_sset_info *sset_info = NULL;
+ struct ethtool_gstrings *cmd = NULL;
+ struct ifreq ifr;
+ uint32_t sset_len, i;
+ char *str;
+ int err;
+
+ netlink_esp_hw_offload.state = NIC_OFFLOAD_UNSUPPORTED;
+
+ /* Determine number of device-features */
+ sset_info = malloc(sizeof(*sset_info));
+ if (sset_info == NULL)
+ {
+ goto out;
+ }
+ memset(sset_info, 0, sizeof(*sset_info));
+
+ sset_info->cmd = ETHTOOL_GSSET_INFO;
+ sset_info->sset_mask = 1ULL << ETH_SS_FEATURES;
+ strcpy(ifr.ifr_name, ifname);
+
+ ifr.ifr_data = (void *)sset_info;
+
+ err = ioctl(fd_for_socket, SIOCETHTOOL, &ifr);
+ if (err != 0)
+ {
+ goto out;
+ }
+
+ if (sset_info->sset_mask != 1ULL << ETH_SS_FEATURES)
+ {
+ goto out;
+ }
+ sset_len = sset_info->data[0];
+
+ /* Retrieve names of device-features */
+ cmd = malloc(sizeof(*cmd) + ETH_GSTRING_LEN * sset_len);
+ if (cmd == NULL)
+ {
+ goto out;
+ }
+
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->cmd = ETHTOOL_GSTRINGS;
+ cmd->string_set = ETH_SS_FEATURES;
+ strcpy(ifr.ifr_name, ifname);
+ ifr.ifr_data = (void *)cmd;
+ err = ioctl(fd_for_socket, SIOCETHTOOL, &ifr);
+ if (err)
+ {
+ goto out;
+ }
+
+ /* Look for the ESP_HW feature bit */
+ str = (char *)cmd->data;
+ for (i = 0; i < cmd->len; i++)
+ {
+ if (strneq(str, "esp-hw-offload", ETH_GSTRING_LEN) == 1)
+ break;
+ str += ETH_GSTRING_LEN;
+ }
+ if (i >= cmd->len)
+ {
+ goto out;
+ }
+
+ netlink_esp_hw_offload.bit = i;
+ netlink_esp_hw_offload.total_blocks = (sset_len + 31) / 32;
+ netlink_esp_hw_offload.state = NIC_OFFLOAD_SUPPORTED;
+
+out:
+ if (sset_info != NULL)
+ {
+ free(sset_info);
+ }
+ if (cmd != NULL)
+ {
+ free(cmd);
+ }
+}
+
+/**
+ * Check if interface supported HW offload
+ */
+static bool netlink_detect_offload(const char *ifname)
+{
+ struct ethtool_gfeatures *cmd;
+ uint32_t feature_bit;
+ struct ifreq ifr;
+ bool ret = FALSE;
+ int nl_send_fd;
+ int block;
+
+ nl_send_fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_XFRM);
+
+ if (nl_send_fd < 0)
+ {
+ return FALSE;
+ }
+
+ /*
+ * Kernel requires a real interface in order to query the kernel-wide
+ * capability, so we do it here on first invocation.
+ */
+ if (netlink_esp_hw_offload.state == NIC_OFFLOAD_UNKNOWN)
+ {
+ netlink_find_offload_feature(ifname, nl_send_fd);
+ }
+
+ if (netlink_esp_hw_offload.state == NIC_OFFLOAD_UNSUPPORTED)
+ {
+ DBG1(DBG_KNL, "HW offload is not supported by kernel");
+ goto out;
+ }
+
+ /* Feature is supported by kernel. Query device features */
+ cmd = malloc(sizeof(cmd->features[0]) *
+ netlink_esp_hw_offload.total_blocks);
+ if (cmd == NULL)
+ {
+ goto out;
+ }
+
+ strcpy(ifr.ifr_name, ifname);
+
+ ifr.ifr_data = (void *)cmd;
+ cmd->cmd = ETHTOOL_GFEATURES;
+ cmd->size = netlink_esp_hw_offload.total_blocks;
+
+ if (ioctl(nl_send_fd, SIOCETHTOOL, &ifr))
+ {
+ goto out_free;
+ }
+
+ block = netlink_esp_hw_offload.bit / 32;
+ feature_bit = 1U << (netlink_esp_hw_offload.bit % 32);
+ if (cmd->features[block].active & feature_bit)
+ {
+ ret = TRUE;
+ }
+
+out_free:
+ free(cmd);
+ if (ret == FALSE)
+ {
+ DBG1(DBG_KNL, "HW offload is not supported by device");
+ }
+out:
+ close(nl_send_fd);
+ return ret;
+}
+
+/**
+ * There are 3 configuration options:
+ * 1. HW_OFFLOAD_NO : Do not configure HW offload..
+ * 2. HW_OFFLOAD_YES : Configure HW offload.
+ * Fail SA addition if offload is not supported.
+ * 3. HW_OFFLOAD_AUTO : Configure HW offload if supported by the kernel
+ * and device.
+ * Do not fail SA addition otherwise.
+ */
+static bool config_hw_offload(kernel_ipsec_sa_id_t *id,
+ kernel_ipsec_add_sa_t *data, struct nlmsghdr *hdr, int buflen)
+{
+ bool cfg_hw_offload_is_yes = (data->hw_offload == HW_OFFLOAD_YES);
+ host_t *local = data->inbound ? id->dst : id->src;
+ struct xfrm_user_offload *offload;
+ bool hw_offload_support;
+ bool ret = FALSE;
+ char *ifname;
+
+ /* Do Ipsec configuration without offload */
+ if (data->hw_offload == HW_OFFLOAD_NO)
+ {
+ return TRUE;
+ }
+
+ if (!charon->kernel->get_interface(charon->kernel, local, &ifname))
+ {
+ return !cfg_hw_offload_is_yes;
+ }
+
+ /* Check if interface supports hw_offload */
+ hw_offload_support = netlink_detect_offload(ifname);
+
+ if (!hw_offload_support)
+ {
+ ret = !cfg_hw_offload_is_yes;
+ goto out;
+ }
+
+ /* Activate HW offload */
+ offload = netlink_reserve(hdr, buflen,
+ XFRMA_OFFLOAD_DEV, sizeof(*offload));
+ if (!offload)
+ {
+ ret = !cfg_hw_offload_is_yes;
+ goto out;
+ }
+ offload->ifindex = if_nametoindex(ifname);
+ if (local->get_family(local) == AF_INET6)
+ {
+ offload->flags |= XFRM_OFFLOAD_IPV6;
+ }
+ offload->flags |= data->inbound ? XFRM_OFFLOAD_INBOUND : 0;
+
+ ret = TRUE;
+
+out:
+ free(ifname);
+ return ret;
+}
+
METHOD(kernel_ipsec_t, add_sa, status_t,
private_kernel_netlink_ipsec_t *this, kernel_ipsec_sa_id_t *id,
kernel_ipsec_add_sa_t *data)
@@ -1650,30 +1908,12 @@ METHOD(kernel_ipsec_t, add_sa, status_t,
data->replay_window);
sa->replay_window = data->replay_window;
}
- if (data->hw_offload)
- {
- host_t *local = data->inbound ? id->dst : id->src;
- char *ifname;
- if (charon->kernel->get_interface(charon->kernel, local, &ifname))
- {
- struct xfrm_user_offload *offload;
-
- offload = netlink_reserve(hdr, sizeof(request),
- XFRMA_OFFLOAD_DEV, sizeof(*offload));
- if (!offload)
- {
- free(ifname);
- goto failed;
- }
- offload->ifindex = if_nametoindex(ifname);
- if (local->get_family(local) == AF_INET6)
- {
- offload->flags |= XFRM_OFFLOAD_IPV6;
- }
- offload->flags |= data->inbound ? XFRM_OFFLOAD_INBOUND : 0;
- free(ifname);
- }
+ DBG2(DBG_KNL, " HW offload mode = %N", hw_offload_names, data->hw_offload);
+ if (!config_hw_offload(id, data, hdr, sizeof(request)))
+ {
+ DBG1(DBG_KNL, "failed to configure HW offload");
+ goto failed;
}
}
--
1.8.3.1
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