lib: Portability to FreeBSD

Various portability fixes for FreeBSD. POSIX requires shm file names
to start with a "/" to be portable.  lseek(2) can be undefined on
POSIX shm, replaced with ftruncate(2). IRMd check on existing lockfile
more portable.

FreeBSD 11.0 is preferred as it natively supports robust mutexes.
Full working LLC implementation pending.

1 files changed, 73 insertions, 6 deletions

diff --git a/src/ipcpd/shim-eth-llc/main.c b/src/ipcpd/shim-eth-llc/main.c
index c2309272..3fd2188a 100644
--- a/src/ipcpd/shim-eth-llc/main.c
+++ b/src/ipcpd/shim-eth-llc/main.c
@@ -53,8 +53,17 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <netinet/in.h>
+
+#ifdef __linux__
 #include <linux/if_packet.h>
 #include <linux/if_ether.h>
+#endif
+
+#ifdef __FreeBSD__
+#include <net/if_dl.h>
+#include <netinet/if_ether.h>
+#endif
+
 #include <poll.h>
 #include <sys/mman.h>
 
@@ -89,7 +98,11 @@ struct eth_llc_ipcp_data {
         /* Keep ipcp_data first for polymorphism. */
         struct ipcp_data      ipcp_data;
 
+#ifdef __FreeBSD__
+        struct sockaddr_dl    device;
+#else
         struct sockaddr_ll    device;
+#endif
         int                   s_fd;
 
         struct bmp *          indices;
@@ -285,7 +298,11 @@ static int eth_llc_ipcp_send_frame(uint8_t   dst_addr[MAC_SIZE],
         uint8_t * frame;
 #else
         uint8_t frame[SHIM_ETH_LLC_MAX_SDU_SIZE];
-        struct sockaddr_ll device;
+#ifdef __FreeBSD__
+        struct sockaddr_dl    device;
+#else
+        struct sockaddr_ll    device;
+#endif
 #endif
 
         if (payload == NULL) {
@@ -321,7 +338,11 @@ static int eth_llc_ipcp_send_frame(uint8_t   dst_addr[MAC_SIZE],
         memcpy(frame, dst_addr, MAC_SIZE * sizeof(uint8_t));
         frame_len += MAC_SIZE;
         memcpy(frame + frame_len,
+#ifdef __FreeBSD__
+               LLADDR(&shim_data(_ipcp)->device),
+#else
                shim_data(_ipcp)->device.sll_addr,
+#endif
                MAC_SIZE * sizeof(uint8_t));
         frame_len += MAC_SIZE;
         memcpy(frame + frame_len, &length, 2 * sizeof(uint8_t));
@@ -671,8 +692,11 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
 #endif
                 for (i = 0; i < MAC_SIZE; i++)
                         dst_mac[i] = buf[i];
-
+#ifdef __FreeBSD__
+                if (memcmp(LLADDR(&shim_data(_ipcp)->device),
+#else
                 if (memcmp(shim_data(_ipcp)->device.sll_addr,
+#endif
                            dst_mac,
                            MAC_SIZE) &&
                     memcmp(br_addr, dst_mac, MAC_SIZE)) {
@@ -868,7 +892,13 @@ static int eth_llc_ipcp_bootstrap(struct dif_config * conf)
         int fd = -1;
         struct ifreq ifr;
         int index;
+#ifdef __FreeBSD__
+        struct ifaddrs * ifaddr;
+        struct ifaddrs * ifa;
+        struct sockaddr_dl device;
+#else
         struct sockaddr_ll device;
+#endif
 
 #if defined(PACKET_RX_RING) && defined(PACKET_TX_RING)
         struct tpacket_req req;
@@ -897,21 +927,58 @@ static int eth_llc_ipcp_bootstrap(struct dif_config * conf)
 
         memcpy(ifr.ifr_name, conf->if_name, strlen(conf->if_name));
 
+#ifdef __FreeBSD__
+        if (getifaddrs(&ifaddr) < 0)  {
+                close(fd);
+                LOG_ERR("Could not get interfaces.");
+                return -1;
+        }
+
+        for (ifa = ifaddr, index = 0; ifa != NULL; ifa = ifa->ifa_next, ++index) {
+                if (strcmp(ifa->ifa_name, conf->if_name))
+                        continue;
+                LOG_DBGF("Interface %s found.", conf->if_name);
+
+                memcpy(&ifr.ifr_addr, ifa->ifa_addr, sizeof(*ifa->ifa_addr));
+                break;
+        }
+
+        if (ifa == NULL) {
+                LOG_ERR("Interface not found.");
+                freeifaddrs(ifaddr);
+                return -1;
+        }
+
+        freeifaddrs(ifaddr);
+
+#else
         if (ioctl(fd, SIOCGIFHWADDR, &ifr)) {
                 close(fd);
                 LOG_ERR("Failed to ioctl: %s.", strerror(errno));
                 return -1;
         }
 
-        close(fd);
-
         index = if_nametoindex(conf->if_name);
         if (index == 0) {
                 LOG_ERR("Failed to retrieve interface index.");
                 return -1;
         }
+#endif
+
+        close(fd);
 
         memset(&(device), 0, sizeof(device));
+#ifdef __FreeBSD__
+        device.sdl_index = index;
+        device.sdl_family = AF_LINK;
+        memcpy(LLADDR(&device),
+               ifr.ifr_addr.sa_data,
+               MAC_SIZE * sizeof (uint8_t));
+        device.sdl_alen = MAC_SIZE;
+        /* TODO: replace socket calls with bpf for BSD */
+        LOG_MISSING;
+        fd = socket(AF_LINK, SOCK_RAW, 0);
+#else
         device.sll_ifindex = index;
         device.sll_family = AF_PACKET;
         memcpy(device.sll_addr,
@@ -921,6 +988,7 @@ static int eth_llc_ipcp_bootstrap(struct dif_config * conf)
         device.sll_protocol = htons(ETH_P_ALL);
 
         fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_802_2));
+#endif
         if (fd < 0) {
                 LOG_ERR("Failed to create socket: %s.", strerror(errno));
                 return -1;
@@ -953,8 +1021,7 @@ static int eth_llc_ipcp_bootstrap(struct dif_config * conf)
         }
 #endif
 
-        if (bind(fd,(struct sockaddr *) &device,
-                 sizeof(struct sockaddr_ll))) {
+        if (bind(fd,(struct sockaddr *) &device, sizeof(device))) {
                 LOG_ERR("Failed to bind socket to interface");
                 close(fd);
                 return -1;