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-rw-r--r--src/libknot/xdp/eth.c312
1 files changed, 312 insertions, 0 deletions
diff --git a/src/libknot/xdp/eth.c b/src/libknot/xdp/eth.c
new file mode 100644
index 0000000..608eb20
--- /dev/null
+++ b/src/libknot/xdp/eth.c
@@ -0,0 +1,312 @@
+/* Copyright (C) 2023 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <bpf/libbpf.h>
+#include <errno.h>
+#include <ifaddrs.h>
+#include <linux/ethtool.h>
+#include <linux/if_link.h>
+#include <linux/if_vlan.h>
+#include <linux/sockios.h>
+#include <net/if.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "contrib/openbsd/strlcpy.h"
+#include "contrib/sockaddr.h"
+#include "libknot/attribute.h"
+#include "libknot/endian.h"
+#include "libknot/errcode.h"
+#include "libknot/xdp/eth.h"
+
+_public_
+int knot_eth_queues(const char *devname)
+{
+ if (devname == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ int fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd < 0) {
+ return knot_map_errno();
+ }
+
+ struct ethtool_channels ch = {
+ .cmd = ETHTOOL_GCHANNELS
+ };
+ struct ifreq ifr = {
+ .ifr_data = (char *)&ch
+ };
+ strlcpy(ifr.ifr_name, devname, IFNAMSIZ);
+
+ int ret = ioctl(fd, SIOCETHTOOL, &ifr);
+ if (ret != 0) {
+ if (errno == EOPNOTSUPP) {
+ ret = 1;
+ } else {
+ ret = knot_map_errno();
+ }
+ } else {
+ if (ch.combined_count == 0) {
+ ret = 1;
+ } else {
+ ret = ch.combined_count;
+ }
+ }
+
+ close(fd);
+ return ret;
+}
+
+_public_
+int knot_eth_rss(const char *devname, knot_eth_rss_conf_t **rss_conf)
+{
+ if (devname == NULL || rss_conf == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ struct ethtool_rxfh *ctx = NULL;
+ knot_eth_rss_conf_t *out = NULL;
+ int ret = KNOT_ERROR;
+
+ int fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd < 0) {
+ return knot_map_errno();
+ }
+
+ struct ethtool_rxfh sizes = {
+ .cmd = ETHTOOL_GRSSH
+ };
+ struct ifreq ifr = {
+ .ifr_data = (char *)&sizes
+ };
+ strlcpy(ifr.ifr_name, devname, IFNAMSIZ);
+
+ ret = ioctl(fd, SIOCETHTOOL, &ifr);
+ if (ret != 0) {
+ ret = knot_map_errno();
+ goto finish;
+ }
+
+ const unsigned data_size = sizes.indir_size * sizeof(sizes.rss_config[0]) +
+ sizes.key_size;
+
+ ctx = calloc(1, sizeof(*ctx) + data_size);
+ if (ctx == NULL) {
+ ret = KNOT_ENOMEM;
+ goto finish;
+ }
+ ctx->cmd = ETHTOOL_GRSSH;
+ ctx->indir_size = sizes.indir_size;
+ ctx->key_size = sizes.key_size;
+ ifr.ifr_data = (char *)ctx;
+
+ ret = ioctl(fd, SIOCETHTOOL, &ifr);
+ if (ret != 0) {
+ ret = knot_map_errno();
+ goto finish;
+ }
+
+ out = calloc(1, sizeof(*out) + data_size);
+ if (out == NULL) {
+ ret = KNOT_ENOMEM;
+ goto finish;
+ }
+
+ out->table_size = sizes.indir_size;
+ out->key_size = sizes.key_size;
+ memcpy(out->data, ctx->rss_config, data_size);
+ out->mask = out->table_size - 1;
+finish:
+ *rss_conf = out;
+
+ free(ctx);
+ close(fd);
+ return ret;
+}
+
+_public_
+int knot_eth_mtu(const char *devname)
+{
+ if (devname == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ int fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd < 0) {
+ return knot_map_errno();
+ }
+
+ struct ifreq ifr = { 0 };
+ strlcpy(ifr.ifr_name, devname, IFNAMSIZ);
+
+ int ret = ioctl(fd, SIOCGIFMTU, &ifr);
+ if (ret != 0) {
+ if (errno == EOPNOTSUPP) {
+ ret = KNOT_ENOTSUP;
+ } else {
+ ret = knot_map_errno();
+ }
+ } else {
+ ret = ifr.ifr_mtu;
+ }
+
+ close(fd);
+ return ret;
+}
+
+_public_
+int knot_eth_name_from_addr(const struct sockaddr_storage *addr, char *out,
+ size_t out_len)
+{
+ if (addr == NULL || out == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ struct ifaddrs *ifaces = NULL;
+ if (getifaddrs(&ifaces) != 0) {
+ return -errno;
+ }
+
+ size_t matches = 0;
+ char *match_name = NULL;
+
+ for (struct ifaddrs *ifa = ifaces; ifa != NULL; ifa = ifa->ifa_next) {
+ const struct sockaddr_storage *ifss = (struct sockaddr_storage *)ifa->ifa_addr;
+ if (ifss == NULL) { // Observed on interfaces without any address.
+ continue;
+ }
+
+ if ((ifss->ss_family == addr->ss_family && sockaddr_is_any(addr)) ||
+ sockaddr_cmp(ifss, addr, true) == 0) {
+ matches++;
+ match_name = ifa->ifa_name;
+ }
+ }
+
+ if (matches == 1) {
+ size_t len = strlcpy(out, match_name, out_len);
+ freeifaddrs(ifaces);
+ return (len >= out_len) ? KNOT_ESPACE : KNOT_EOK;
+ }
+
+ freeifaddrs(ifaces);
+ return matches == 0 ? KNOT_EADDRNOTAVAIL : KNOT_ELIMIT;
+}
+
+_public_
+int knot_eth_vlans(uint16_t *vlan_map[], uint16_t *vlan_map_max)
+{
+ if (vlan_map == NULL || vlan_map_max == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ struct ifaddrs *ifaces = NULL;
+ if (getifaddrs(&ifaces) != 0) {
+ return knot_map_errno();
+ }
+
+ unsigned map_size = 0;
+ for (struct ifaddrs *ifa = ifaces; ifa != NULL; ifa = ifa->ifa_next) {
+ if (ifa->ifa_addr->sa_family != AF_PACKET) {
+ continue;
+ }
+ map_size++;
+ }
+
+ uint16_t *map = calloc(sizeof(uint16_t), 1 + map_size); // Indexed from 1.
+ if (map == NULL) {
+ freeifaddrs(ifaces);
+ return KNOT_ENOMEM;
+ }
+
+ int fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd < 0) {
+ free(map);
+ freeifaddrs(ifaces);
+ return knot_map_errno();
+ }
+
+ for (struct ifaddrs *ifa = ifaces; ifa != NULL; ifa = ifa->ifa_next) {
+ if (ifa->ifa_addr == NULL || ifa->ifa_addr->sa_family != AF_PACKET) {
+ continue;
+ }
+
+ unsigned if_index = if_nametoindex(ifa->ifa_name);
+ if (if_index == 0) {
+ close(fd);
+ free(map);
+ freeifaddrs(ifaces);
+ return knot_map_errno();
+ }
+
+ struct vlan_ioctl_args ifv = {
+ .cmd = GET_VLAN_REALDEV_NAME_CMD
+ };
+ strlcpy(ifv.device1, ifa->ifa_name, sizeof(ifv.device1));
+
+ if (ioctl(fd, SIOCGIFVLAN, &ifv) >= 0) {
+ memset(&ifv, 0, sizeof(ifv));
+ ifv.cmd = GET_VLAN_VID_CMD;
+ strlcpy(ifv.device1, ifa->ifa_name, sizeof(ifv.device1));
+
+ if (ioctl(fd, SIOCGIFVLAN, &ifv) < 0) {
+ close(fd);
+ free(map);
+ freeifaddrs(ifaces);
+ return knot_map_errno();
+ }
+
+ map[if_index] = htobe16(ifv.u.VID);
+ }
+ }
+
+ close(fd);
+ freeifaddrs(ifaces);
+
+ *vlan_map = map;
+ *vlan_map_max = map_size;
+
+ return KNOT_EOK;
+}
+
+_public_
+knot_xdp_mode_t knot_eth_xdp_mode(int if_index)
+{
+#if USE_LIBXDP
+ struct bpf_xdp_query_opts info = { .sz = sizeof(info) };
+ int ret = bpf_xdp_query(if_index, 0, &info);
+#else
+ struct xdp_link_info info;
+ int ret = bpf_get_link_xdp_info(if_index, &info, sizeof(info), 0);
+#endif
+ if (ret != 0) {
+ return KNOT_XDP_MODE_NONE;
+ }
+
+ switch (info.attach_mode) {
+ case XDP_ATTACHED_DRV:
+ case XDP_ATTACHED_HW:
+ return KNOT_XDP_MODE_FULL;
+ case XDP_ATTACHED_SKB:
+ return KNOT_XDP_MODE_EMUL;
+ default:
+ return KNOT_XDP_MODE_NONE;
+ }
+}
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