Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 332 insertions, 0 deletions

diff --git a/qemu/slirp/bootp.c b/qemu/slirp/bootp.c
new file mode 100644
index 000000000..b7db9fa33
--- /dev/null
+++ b/qemu/slirp/bootp.c
@@ -0,0 +1,332 @@
+/*
+ * QEMU BOOTP/DHCP server
+ *
+ * Copyright (c) 2004 Fabrice Bellard
+ *
+ * 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.
+ */
+#include <slirp.h>
+
+/* XXX: only DHCP is supported */
+
+#define LEASE_TIME (24 * 3600)
+
+static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
+
+#ifdef DEBUG
+#define DPRINTF(fmt, ...) \
+do if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ##  __VA_ARGS__); fflush(dfd); } while (0)
+#else
+#define DPRINTF(fmt, ...) do{}while(0)
+#endif
+
+static BOOTPClient *get_new_addr(Slirp *slirp, struct in_addr *paddr,
+                                 const uint8_t *macaddr)
+{
+    BOOTPClient *bc;
+    int i;
+
+    for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
+        bc = &slirp->bootp_clients[i];
+        if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6))
+            goto found;
+    }
+    return NULL;
+ found:
+    bc = &slirp->bootp_clients[i];
+    bc->allocated = 1;
+    paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
+    return bc;
+}
+
+static BOOTPClient *request_addr(Slirp *slirp, const struct in_addr *paddr,
+                                 const uint8_t *macaddr)
+{
+    uint32_t req_addr = ntohl(paddr->s_addr);
+    uint32_t dhcp_addr = ntohl(slirp->vdhcp_startaddr.s_addr);
+    BOOTPClient *bc;
+
+    if (req_addr >= dhcp_addr &&
+        req_addr < (dhcp_addr + NB_BOOTP_CLIENTS)) {
+        bc = &slirp->bootp_clients[req_addr - dhcp_addr];
+        if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6)) {
+            bc->allocated = 1;
+            return bc;
+        }
+    }
+    return NULL;
+}
+
+static BOOTPClient *find_addr(Slirp *slirp, struct in_addr *paddr,
+                              const uint8_t *macaddr)
+{
+    BOOTPClient *bc;
+    int i;
+
+    for(i = 0; i < NB_BOOTP_CLIENTS; i++) {
+        if (!memcmp(macaddr, slirp->bootp_clients[i].macaddr, 6))
+            goto found;
+    }
+    return NULL;
+ found:
+    bc = &slirp->bootp_clients[i];
+    bc->allocated = 1;
+    paddr->s_addr = slirp->vdhcp_startaddr.s_addr + htonl(i);
+    return bc;
+}
+
+static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type,
+                        struct in_addr *preq_addr)
+{
+    const uint8_t *p, *p_end;
+    int len, tag;
+
+    *pmsg_type = 0;
+    preq_addr->s_addr = htonl(0L);
+
+    p = bp->bp_vend;
+    p_end = p + DHCP_OPT_LEN;
+    if (memcmp(p, rfc1533_cookie, 4) != 0)
+        return;
+    p += 4;
+    while (p < p_end) {
+        tag = p[0];
+        if (tag == RFC1533_PAD) {
+            p++;
+        } else if (tag == RFC1533_END) {
+            break;
+        } else {
+            p++;
+            if (p >= p_end)
+                break;
+            len = *p++;
+            DPRINTF("dhcp: tag=%d len=%d\n", tag, len);
+
+            switch(tag) {
+            case RFC2132_MSG_TYPE:
+                if (len >= 1)
+                    *pmsg_type = p[0];
+                break;
+            case RFC2132_REQ_ADDR:
+                if (len >= 4) {
+                    memcpy(&(preq_addr->s_addr), p, 4);
+                }
+                break;
+            default:
+                break;
+            }
+            p += len;
+        }
+    }
+    if (*pmsg_type == DHCPREQUEST && preq_addr->s_addr == htonl(0L) &&
+        bp->bp_ciaddr.s_addr) {
+        memcpy(&(preq_addr->s_addr), &bp->bp_ciaddr, 4);
+    }
+}
+
+static void bootp_reply(Slirp *slirp, const struct bootp_t *bp)
+{
+    BOOTPClient *bc = NULL;
+    struct mbuf *m;
+    struct bootp_t *rbp;
+    struct sockaddr_in saddr, daddr;
+    struct in_addr preq_addr;
+    int dhcp_msg_type, val;
+    uint8_t *q;
+    uint8_t client_ethaddr[ETH_ALEN];
+
+    /* extract exact DHCP msg type */
+    dhcp_decode(bp, &dhcp_msg_type, &preq_addr);
+    DPRINTF("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type);
+    if (preq_addr.s_addr != htonl(0L))
+        DPRINTF(" req_addr=%08x\n", ntohl(preq_addr.s_addr));
+    else
+        DPRINTF("\n");
+
+    if (dhcp_msg_type == 0)
+        dhcp_msg_type = DHCPREQUEST; /* Force reply for old BOOTP clients */
+
+    if (dhcp_msg_type != DHCPDISCOVER &&
+        dhcp_msg_type != DHCPREQUEST)
+        return;
+
+    /* Get client's hardware address from bootp request */
+    memcpy(client_ethaddr, bp->bp_hwaddr, ETH_ALEN);
+
+    m = m_get(slirp);
+    if (!m) {
+        return;
+    }
+    m->m_data += IF_MAXLINKHDR;
+    rbp = (struct bootp_t *)m->m_data;
+    m->m_data += sizeof(struct udpiphdr);
+    memset(rbp, 0, sizeof(struct bootp_t));
+
+    if (dhcp_msg_type == DHCPDISCOVER) {
+        if (preq_addr.s_addr != htonl(0L)) {
+            bc = request_addr(slirp, &preq_addr, client_ethaddr);
+            if (bc) {
+                daddr.sin_addr = preq_addr;
+            }
+        }
+        if (!bc) {
+         new_addr:
+            bc = get_new_addr(slirp, &daddr.sin_addr, client_ethaddr);
+            if (!bc) {
+                DPRINTF("no address left\n");
+                return;
+            }
+        }
+        memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
+    } else if (preq_addr.s_addr != htonl(0L)) {
+        bc = request_addr(slirp, &preq_addr, client_ethaddr);
+        if (bc) {
+            daddr.sin_addr = preq_addr;
+            memcpy(bc->macaddr, client_ethaddr, ETH_ALEN);
+        } else {
+            /* DHCPNAKs should be sent to broadcast */
+            daddr.sin_addr.s_addr = 0xffffffff;
+        }
+    } else {
+        bc = find_addr(slirp, &daddr.sin_addr, bp->bp_hwaddr);
+        if (!bc) {
+            /* if never assigned, behaves as if it was already
+               assigned (windows fix because it remembers its address) */
+            goto new_addr;
+        }
+    }
+
+    /* Update ARP table for this IP address */
+    arp_table_add(slirp, daddr.sin_addr.s_addr, client_ethaddr);
+
+    saddr.sin_addr = slirp->vhost_addr;
+    saddr.sin_port = htons(BOOTP_SERVER);
+
+    daddr.sin_port = htons(BOOTP_CLIENT);
+
+    rbp->bp_op = BOOTP_REPLY;
+    rbp->bp_xid = bp->bp_xid;
+    rbp->bp_htype = 1;
+    rbp->bp_hlen = 6;
+    memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, ETH_ALEN);
+
+    rbp->bp_yiaddr = daddr.sin_addr; /* Client IP address */
+    rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */
+
+    q = rbp->bp_vend;
+    memcpy(q, rfc1533_cookie, 4);
+    q += 4;
+
+    if (bc) {
+        DPRINTF("%s addr=%08x\n",
+                (dhcp_msg_type == DHCPDISCOVER) ? "offered" : "ack'ed",
+                ntohl(daddr.sin_addr.s_addr));
+
+        if (dhcp_msg_type == DHCPDISCOVER) {
+            *q++ = RFC2132_MSG_TYPE;
+            *q++ = 1;
+            *q++ = DHCPOFFER;
+        } else /* DHCPREQUEST */ {
+            *q++ = RFC2132_MSG_TYPE;
+            *q++ = 1;
+            *q++ = DHCPACK;
+        }
+
+        if (slirp->bootp_filename)
+            snprintf((char *)rbp->bp_file, sizeof(rbp->bp_file), "%s",
+                     slirp->bootp_filename);
+
+        *q++ = RFC2132_SRV_ID;
+        *q++ = 4;
+        memcpy(q, &saddr.sin_addr, 4);
+        q += 4;
+
+        *q++ = RFC1533_NETMASK;
+        *q++ = 4;
+        memcpy(q, &slirp->vnetwork_mask, 4);
+        q += 4;
+
+        if (!slirp->restricted) {
+            *q++ = RFC1533_GATEWAY;
+            *q++ = 4;
+            memcpy(q, &saddr.sin_addr, 4);
+            q += 4;
+
+            *q++ = RFC1533_DNS;
+            *q++ = 4;
+            memcpy(q, &slirp->vnameserver_addr, 4);
+            q += 4;
+        }
+
+        *q++ = RFC2132_LEASE_TIME;
+        *q++ = 4;
+        val = htonl(LEASE_TIME);
+        memcpy(q, &val, 4);
+        q += 4;
+
+        if (*slirp->client_hostname) {
+            val = strlen(slirp->client_hostname);
+            *q++ = RFC1533_HOSTNAME;
+            *q++ = val;
+            memcpy(q, slirp->client_hostname, val);
+            q += val;
+        }
+
+        if (slirp->vdnssearch) {
+            size_t spaceleft = sizeof(rbp->bp_vend) - (q - rbp->bp_vend);
+            val = slirp->vdnssearch_len;
+            if (val + 1 > spaceleft) {
+                g_warning("DHCP packet size exceeded, "
+                    "omitting domain-search option.");
+            } else {
+                memcpy(q, slirp->vdnssearch, val);
+                q += val;
+            }
+        }
+    } else {
+        static const char nak_msg[] = "requested address not available";
+
+        DPRINTF("nak'ed addr=%08x\n", ntohl(preq_addr.s_addr));
+
+        *q++ = RFC2132_MSG_TYPE;
+        *q++ = 1;
+        *q++ = DHCPNAK;
+
+        *q++ = RFC2132_MESSAGE;
+        *q++ = sizeof(nak_msg) - 1;
+        memcpy(q, nak_msg, sizeof(nak_msg) - 1);
+        q += sizeof(nak_msg) - 1;
+    }
+    *q = RFC1533_END;
+
+    daddr.sin_addr.s_addr = 0xffffffffu;
+
+    m->m_len = sizeof(struct bootp_t) -
+        sizeof(struct ip) - sizeof(struct udphdr);
+    udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
+}
+
+void bootp_input(struct mbuf *m)
+{
+    struct bootp_t *bp = mtod(m, struct bootp_t *);
+
+    if (bp->bp_op == BOOTP_REQUEST) {
+        bootp_reply(m->slirp, bp);
+    }
+}