macsec_linux: Hook QCA driver wrapper for hostapd MACsec

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

diff --git a/src/drivers/driver_macsec_linux.c b/src/drivers/driver_macsec_linux.c
index 9d981bb70f78c6fd2fcbf73e0527ec1c7bd73349..e922503fccd048344ce597e8e12bef7ef1366cad 100644 (file)
--- a/src/drivers/driver_macsec_linux.c
+++ b/src/drivers/driver_macsec_linux.c
@@ -1,6 +1,7 @@
 /*
  * Driver interaction with Linux MACsec kernel module
  * Copyright (c) 2016, Sabrina Dubroca <sd@queasysnail.net> and Red Hat, Inc.
+ * Copyright (c) 2019, The Linux Foundation
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -22,6 +23,7 @@
 
 #include "utils/common.h"
 #include "utils/eloop.h"
+#include "common/eapol_common.h"
 #include "pae/ieee802_1x_kay.h"
 #include "driver.h"
 #include "driver_wired_common.h"
@@ -57,6 +59,7 @@ struct macsec_drv_data {
        char ifname[IFNAMSIZ + 1];
        int ifi;
        int parent_ifi;
+       int use_pae_group_addr;
 
        Boolean created_link;
 
@@ -1399,6 +1402,214 @@ static int macsec_drv_status(void *priv, char *buf, size_t buflen)
 }
 
 
+#ifdef __linux__
+
+static void macsec_drv_handle_data(void *ctx, unsigned char *buf, size_t len)
+{
+#ifdef HOSTAPD
+       struct ieee8023_hdr *hdr;
+       u8 *pos, *sa;
+       size_t left;
+       union wpa_event_data event;
+
+       /* must contain at least ieee8023_hdr 6 byte source, 6 byte dest,
+        * 2 byte ethertype */
+       if (len < 14) {
+               wpa_printf(MSG_MSGDUMP, "%s: too short (%lu)",
+                          __func__, (unsigned long) len);
+               return;
+       }
+
+       hdr = (struct ieee8023_hdr *) buf;
+
+       switch (ntohs(hdr->ethertype)) {
+       case ETH_P_PAE:
+               wpa_printf(MSG_MSGDUMP, "Received EAPOL packet");
+               sa = hdr->src;
+               os_memset(&event, 0, sizeof(event));
+               event.new_sta.addr = sa;
+               wpa_supplicant_event(ctx, EVENT_NEW_STA, &event);
+
+               pos = (u8 *) (hdr + 1);
+               left = len - sizeof(*hdr);
+               drv_event_eapol_rx(ctx, sa, pos, left);
+               break;
+
+       default:
+               wpa_printf(MSG_DEBUG, "Unknown ethertype 0x%04x in data frame",
+                          ntohs(hdr->ethertype));
+               break;
+       }
+#endif /* HOSTAPD */
+}
+
+
+static void macsec_drv_handle_read(int sock, void *eloop_ctx, void *sock_ctx)
+{
+       int len;
+       unsigned char buf[3000];
+
+       len = recv(sock, buf, sizeof(buf), 0);
+       if (len < 0) {
+               wpa_printf(MSG_ERROR, "macsec_linux: recv: %s",
+                          strerror(errno));
+               return;
+       }
+
+       macsec_drv_handle_data(eloop_ctx, buf, len);
+}
+
+#endif /* __linux__ */
+
+
+static int macsec_drv_init_sockets(struct macsec_drv_data *drv, u8 *own_addr)
+{
+#ifdef __linux__
+       struct ifreq ifr;
+       struct sockaddr_ll addr;
+
+       drv->common.sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_PAE));
+       if (drv->common.sock < 0) {
+               wpa_printf(MSG_ERROR, "socket[PF_PACKET,SOCK_RAW]: %s",
+                          strerror(errno));
+               return -1;
+       }
+
+       if (eloop_register_read_sock(drv->common.sock, macsec_drv_handle_read,
+                                    drv->common.ctx, NULL)) {
+               wpa_printf(MSG_INFO, "Could not register read socket");
+               return -1;
+       }
+
+       os_memset(&ifr, 0, sizeof(ifr));
+       os_strlcpy(ifr.ifr_name, drv->common.ifname, sizeof(ifr.ifr_name));
+       if (ioctl(drv->common.sock, SIOCGIFINDEX, &ifr) != 0) {
+               wpa_printf(MSG_ERROR, "ioctl(SIOCGIFINDEX): %s",
+                          strerror(errno));
+               return -1;
+       }
+
+       os_memset(&addr, 0, sizeof(addr));
+       addr.sll_family = AF_PACKET;
+       addr.sll_ifindex = ifr.ifr_ifindex;
+       wpa_printf(MSG_DEBUG, "Opening raw packet socket for ifindex %d",
+                  addr.sll_ifindex);
+
+       if (bind(drv->common.sock, (struct sockaddr *) &addr, sizeof(addr)) < 0)
+       {
+               wpa_printf(MSG_ERROR, "bind: %s", strerror(errno));
+               return -1;
+       }
+
+       /* filter multicast address */
+       if (wired_multicast_membership(drv->common.sock, ifr.ifr_ifindex,
+                                      pae_group_addr, 1) < 0) {
+               wpa_printf(MSG_ERROR, "wired: Failed to add multicast group "
+                          "membership");
+               return -1;
+       }
+
+       os_memset(&ifr, 0, sizeof(ifr));
+       os_strlcpy(ifr.ifr_name, drv->common.ifname, sizeof(ifr.ifr_name));
+       if (ioctl(drv->common.sock, SIOCGIFHWADDR, &ifr) != 0) {
+               wpa_printf(MSG_ERROR, "ioctl(SIOCGIFHWADDR): %s",
+                          strerror(errno));
+               return -1;
+       }
+
+       if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
+               wpa_printf(MSG_INFO, "Invalid HW-addr family 0x%04x",
+                          ifr.ifr_hwaddr.sa_family);
+               return -1;
+       }
+       os_memcpy(own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
+
+       return 0;
+#else /* __linux__ */
+       return -1;
+#endif /* __linux__ */
+}
+
+
+static void * macsec_drv_hapd_init(struct hostapd_data *hapd,
+                                  struct wpa_init_params *params)
+{
+       struct macsec_drv_data *drv;
+
+       drv = os_zalloc(sizeof(struct macsec_drv_data));
+       if (drv == NULL) {
+               wpa_printf(MSG_INFO,
+                          "Could not allocate memory for wired driver data");
+               return NULL;
+       }
+
+       drv->common.ctx = hapd;
+       os_strlcpy(drv->common.ifname, params->ifname,
+                  sizeof(drv->common.ifname));
+       drv->use_pae_group_addr = params->use_pae_group_addr;
+
+       if (macsec_drv_init_sockets(drv, params->own_addr)) {
+               os_free(drv);
+               return NULL;
+       }
+
+       return drv;
+}
+
+
+static void macsec_drv_hapd_deinit(void *priv)
+{
+       struct macsec_drv_data *drv = priv;
+
+       if (drv->common.sock >= 0) {
+               eloop_unregister_read_sock(drv->common.sock);
+               close(drv->common.sock);
+       }
+
+       os_free(drv);
+}
+
+
+static int macsec_drv_send_eapol(void *priv, const u8 *addr,
+                                const u8 *data, size_t data_len, int encrypt,
+                                const u8 *own_addr, u32 flags)
+{
+       struct macsec_drv_data *drv = priv;
+       struct ieee8023_hdr *hdr;
+       size_t len;
+       u8 *pos;
+       int res;
+
+       len = sizeof(*hdr) + data_len;
+       hdr = os_zalloc(len);
+       if (hdr == NULL) {
+               wpa_printf(MSG_INFO,
+                          "%s: malloc() failed (len=%lu)",
+                          __func__, (unsigned long) len);
+               return -1;
+       }
+
+       os_memcpy(hdr->dest, drv->use_pae_group_addr ? pae_group_addr : addr,
+                 ETH_ALEN);
+       os_memcpy(hdr->src, own_addr, ETH_ALEN);
+       hdr->ethertype = htons(ETH_P_PAE);
+
+       pos = (u8 *) (hdr + 1);
+       os_memcpy(pos, data, data_len);
+
+       res = send(drv->common.sock, (u8 *) hdr, len, 0);
+       os_free(hdr);
+
+       if (res < 0) {
+               wpa_printf(MSG_ERROR,
+                          "%s: packet len: %lu - failed: send: %s",
+                          __func__, (unsigned long) len, strerror(errno));
+       }
+
+       return res;
+}
+
+
 const struct wpa_driver_ops wpa_driver_macsec_linux_ops = {
        .name = "macsec_linux",
        .desc = "MACsec Ethernet driver for Linux",
@@ -1407,6 +1618,9 @@ const struct wpa_driver_ops wpa_driver_macsec_linux_ops = {
        .get_capa = driver_wired_get_capa,
        .init = macsec_drv_wpa_init,
        .deinit = macsec_drv_wpa_deinit,
+       .hapd_init = macsec_drv_hapd_init,
+       .hapd_deinit = macsec_drv_hapd_deinit,
+       .hapd_send_eapol = macsec_drv_send_eapol,
 
        .macsec_init = macsec_drv_macsec_init,
        .macsec_deinit = macsec_drv_macsec_deinit,