initial commit

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 258 insertions, 0 deletions

diff --git a/src/include/if_ether.h b/src/include/if_ether.h
new file mode 100644
index 0000000..a71bd21
--- /dev/null
+++ b/src/include/if_ether.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef IF_ETHER_H
+#define IF_ETHER_H
+
+#include <stdint.h>
+
+#define HW_ADDR_LEN 6
+#define PROTO_IPV4 0x0800
+#define PROTO_ARP 0x0806
+
+typedef uint64_t mac_addr_t;
+
+struct ether_hdr {
+    uint8_t dest[HW_ADDR_LEN];
+    uint8_t source[HW_ADDR_LEN];
+    uint16_t proto;
+} __attribute__((packed));
+
+/*
+ * Load the source and dest routes into an ethernet
+ * frame.
+ *
+ * @src: Source address to use
+ * @dest: Dest address to use
+ * @res: Result is written here
+ */
+int ether_load_route(mac_addr_t src, mac_addr_t dest, struct ether_hdr *res);
+
+#endif  /* !IF_ETHER_H */
diff --git a/src/link/if_ether.c b/src/link/if_ether.c
new file mode 100644
index 0000000..e0db260
--- /dev/null
+++ b/src/link/if_ether.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/errno.h>
+#include <byteswap.h>
+#include <string.h>
+#include "if_ether.h"
+
+/*
+ * Using the protocol ID 0xFD for testing,
+ * see RFC 3692
+ */
+#define PROTO_ID 0xFD00
+
+/* 48-bit mask for MAC addresses */
+#define MAC_MASK 0xFFFFFFFFFFFF
+
+#include <stdio.h>
+int
+ether_load_route(mac_addr_t src, mac_addr_t dest, struct ether_hdr *res)
+{
+    uint32_t *p;
+
+    if (res == NULL) {
+        return -EINVAL;
+    }
+
+    /* Set up the source */
+    res->source[0] = (src >> 40) & 0xFF;
+    res->source[1] = (src >> 32) & 0xFF;
+    res->source[2] = (src >> 24) & 0xFF;
+    res->source[3] = (src >> 16) & 0xFF;
+    res->source[4] = (src >> 8) & 0xFF;
+    res->source[5] = src & 0xFF;
+
+    /* Set up the destination */
+    res->dest[0] = (dest >> 40) & 0xFF;
+    res->dest[1] = (dest >> 32) & 0xFF;
+    res->dest[2] = (dest >> 24) & 0xFF;
+    res->dest[3] = (dest >> 16) & 0xFF;
+    res->dest[4] = (dest >> 8) & 0xFF;
+    res->dest[5] = dest & 0xFF;
+    res->proto = PROTO_ID;
+    return 0;
+}
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..4616d12
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <linux/if_packet.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <net/ethernet.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "if_ether.h"
+
+#define TEST_STR "Hello from o.1p!! Meow meow!"
+
+static const char *iface = NULL;
+
+static void
+help(char **argv)
+{
+    printf(
+        "usage: %s -i <iface>\n"
+        "[-h]   Show this message\n"
+        "[-i]   Interface to use\n",
+        argv[0]
+    );
+}
+
+static int
+data_send(void)
+{
+    char data[256], *p;
+    struct sockaddr_ll saddr;
+    struct ether_hdr *eth;
+    struct ifreq ifr;
+    int error, sockfd;
+
+    memset(data, 0, sizeof(data));
+    eth = (struct ether_hdr *)data;
+    p = &data[sizeof(eth) + 100];
+    memcpy(p, TEST_STR, sizeof(TEST_STR));
+
+    sockfd = socket(AF_PACKET, SOCK_RAW, IPPROTO_RAW);
+    if (sockfd < 0) {
+        printf("error: failed to create socket (error=%d)\n", sockfd);
+        return sockfd;
+    }
+
+    /* Set the interface that we want to use */
+    strlcpy(ifr.ifr_name, iface, IFNAMSIZ);
+    error = ioctl(sockfd, SIOGIFINDEX, &ifr);
+    if (error < 0) {
+        printf("ioctl[SIOGIFINDEX]: bad iface \"%s\"\n", iface);
+        return error;
+    }
+
+    /*
+     * Set up link layer sockaddr, load up the frame
+     * and send it off.
+     */
+    saddr.sll_ifindex = ifr.ifr_ifindex;
+    saddr.sll_halen = ETH_ALEN;
+    ether_load_route(0x54E1AD2CAE48, 0xFFFFFFFFFFFF, eth);
+    sendto(
+        sockfd, &data, sizeof(data), 0,
+        (struct sockaddr *)&saddr, sizeof(struct sockaddr_ll)
+    );
+
+    close(sockfd);
+    return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+    int opt;
+
+    if (argc < 2) {
+        printf("error: too few arguments!\n");
+        help(argv);
+        return -1;
+    }
+
+    while ((opt = getopt(argc, argv, "i:h")) != -1) {
+        switch (opt) {
+        case 'h':
+            help(argv);
+            return -1;
+        case 'i':
+            iface = optarg;
+            break;
+        }
+    }
+
+    /* We need an interface */
+    if (iface == NULL) {
+        printf("error: interface not supplied\n");
+        return -1;
+    }
+
+    return data_send();
+}