Common definitions for VMWARE devices

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Yan Vugenfirer <yan@daynix.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

2 files changed, 218 insertions, 0 deletions

diff --git a/net/Makefile.objs b/net/Makefile.objs
index a08cd14..4854a14 100644
--- a/net/Makefile.objs
+++ b/net/Makefile.objs
@@ -1,6 +1,7 @@
 common-obj-y = net.o queue.o checksum.o util.o hub.o
 common-obj-y += socket.o
 common-obj-y += dump.o
+common-obj-y += eth.o
 common-obj-$(CONFIG_POSIX) += tap.o
 common-obj-$(CONFIG_LINUX) += tap-linux.o
 common-obj-$(CONFIG_WIN32) += tap-win32.o
diff --git a/net/eth.c b/net/eth.c
new file mode 100644
index 0000000..1d7494d
--- /dev/null
+++ b/net/eth.c
@@ -0,0 +1,217 @@
+/*
+ * QEMU network structures definitions and helper functions
+ *
+ * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Dmitry Fleytman <dmitry@daynix.com>
+ * Tamir Shomer <tamirs@daynix.com>
+ * Yan Vugenfirer <yan@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "net/eth.h"
+#include "net/checksum.h"
+#include "qemu-common.h"
+#include "net/tap.h"
+
+void eth_setup_vlan_headers(struct eth_header *ehdr, uint16_t vlan_tag,
+    bool *is_new)
+{
+    struct vlan_header *vhdr = PKT_GET_VLAN_HDR(ehdr);
+
+    switch (be16_to_cpu(ehdr->h_proto)) {
+    case ETH_P_VLAN:
+    case ETH_P_DVLAN:
+        /* vlan hdr exists */
+        *is_new = false;
+        break;
+
+    default:
+        /* No VLAN header, put a new one */
+        vhdr->h_proto = ehdr->h_proto;
+        ehdr->h_proto = cpu_to_be16(ETH_P_VLAN);
+        *is_new = true;
+        break;
+    }
+    vhdr->h_tci = cpu_to_be16(vlan_tag);
+}
+
+uint8_t
+eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t l4proto)
+{
+    uint8_t ecn_state = 0;
+
+    if (l3_proto == ETH_P_IP) {
+        struct ip_header *iphdr = (struct ip_header *) l3_hdr;
+
+        if (IP_HEADER_VERSION(iphdr) == IP_HEADER_VERSION_4) {
+            if (IPTOS_ECN(iphdr->ip_tos) == IPTOS_ECN_CE) {
+                ecn_state = VIRTIO_NET_HDR_GSO_ECN;
+            }
+            if (l4proto == IP_PROTO_TCP) {
+                return VIRTIO_NET_HDR_GSO_TCPV4 | ecn_state;
+            } else if (l4proto == IP_PROTO_UDP) {
+                return VIRTIO_NET_HDR_GSO_UDP | ecn_state;
+            }
+        }
+    } else if (l3_proto == ETH_P_IPV6) {
+        struct ip6_header *ip6hdr = (struct ip6_header *) l3_hdr;
+
+        if (IP6_ECN(ip6hdr->ip6_ecn_acc) == IP6_ECN_CE) {
+            ecn_state = VIRTIO_NET_HDR_GSO_ECN;
+        }
+
+        if (l4proto == IP_PROTO_TCP) {
+            return VIRTIO_NET_HDR_GSO_TCPV6 | ecn_state;
+        }
+    }
+
+    /* Unsupported offload */
+    assert(false);
+
+    return VIRTIO_NET_HDR_GSO_NONE | ecn_state;
+}
+
+void eth_get_protocols(const uint8_t *headers,
+                       uint32_t hdr_length,
+                       bool *isip4, bool *isip6,
+                       bool *isudp, bool *istcp)
+{
+    int proto;
+    size_t l2hdr_len = eth_get_l2_hdr_length(headers);
+    assert(hdr_length >= eth_get_l2_hdr_length(headers));
+    *isip4 = *isip6 = *isudp = *istcp = false;
+
+    proto = eth_get_l3_proto(headers, l2hdr_len);
+    if (proto == ETH_P_IP) {
+        *isip4 = true;
+
+        struct ip_header *iphdr;
+
+        assert(hdr_length >=
+            eth_get_l2_hdr_length(headers) + sizeof(struct ip_header));
+
+        iphdr = PKT_GET_IP_HDR(headers);
+
+        if (IP_HEADER_VERSION(iphdr) == IP_HEADER_VERSION_4) {
+            if (iphdr->ip_p == IP_PROTO_TCP) {
+                *istcp = true;
+            } else if (iphdr->ip_p == IP_PROTO_UDP) {
+                *isudp = true;
+            }
+        }
+    } else if (proto == ETH_P_IPV6) {
+        uint8_t l4proto;
+        size_t full_ip6hdr_len;
+
+        struct iovec hdr_vec;
+        hdr_vec.iov_base = (void *) headers;
+        hdr_vec.iov_len = hdr_length;
+
+        *isip6 = true;
+        if (eth_parse_ipv6_hdr(&hdr_vec, 1, l2hdr_len,
+                              &l4proto, &full_ip6hdr_len)) {
+            if (l4proto == IP_PROTO_TCP) {
+                *istcp = true;
+            } else if (l4proto == IP_PROTO_UDP) {
+                *isudp = true;
+            }
+        }
+    }
+}
+
+void
+eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len,
+                            void *l3hdr, size_t l3hdr_len,
+                            size_t l3payload_len,
+                            size_t frag_offset, bool more_frags)
+{
+    if (eth_get_l3_proto(l2hdr, l2hdr_len) == ETH_P_IP) {
+        uint16_t orig_flags;
+        struct ip_header *iphdr = (struct ip_header *) l3hdr;
+        uint16_t frag_off_units = frag_offset / IP_FRAG_UNIT_SIZE;
+        uint16_t new_ip_off;
+
+        assert(frag_offset % IP_FRAG_UNIT_SIZE == 0);
+        assert((frag_off_units & ~IP_OFFMASK) == 0);
+
+        orig_flags = be16_to_cpu(iphdr->ip_off) & ~(IP_OFFMASK|IP_MF);
+        new_ip_off = frag_off_units | orig_flags  | (more_frags ? IP_MF : 0);
+        iphdr->ip_off = cpu_to_be16(new_ip_off);
+        iphdr->ip_len = cpu_to_be16(l3payload_len + l3hdr_len);
+    }
+}
+
+void
+eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len)
+{
+    struct ip_header *iphdr = (struct ip_header *) l3hdr;
+    iphdr->ip_sum = 0;
+    iphdr->ip_sum = cpu_to_be16(net_raw_checksum(l3hdr, l3hdr_len));
+}
+
+uint32_t
+eth_calc_pseudo_hdr_csum(struct ip_header *iphdr, uint16_t csl)
+{
+    struct ip_pseudo_header ipph;
+    ipph.ip_src = iphdr->ip_src;
+    ipph.ip_dst = iphdr->ip_dst;
+    ipph.ip_payload = cpu_to_be16(csl);
+    ipph.ip_proto = iphdr->ip_p;
+    ipph.zeros = 0;
+    return net_checksum_add(sizeof(ipph), (uint8_t *) &ipph);
+}
+
+static bool
+eth_is_ip6_extension_header_type(uint8_t hdr_type)
+{
+    switch (hdr_type) {
+    case IP6_HOP_BY_HOP:
+    case IP6_ROUTING:
+    case IP6_FRAGMENT:
+    case IP6_ESP:
+    case IP6_AUTHENTICATION:
+    case IP6_DESTINATON:
+    case IP6_MOBILITY:
+        return true;
+    default:
+        return false;
+    }
+}
+
+bool eth_parse_ipv6_hdr(struct iovec *pkt, int pkt_frags,
+                        size_t ip6hdr_off, uint8_t *l4proto,
+                        size_t *full_hdr_len)
+{
+    struct ip6_header ip6_hdr;
+    struct ip6_ext_hdr ext_hdr;
+    size_t bytes_read;
+
+    bytes_read = iov_to_buf(pkt, pkt_frags, ip6hdr_off,
+                            &ip6_hdr, sizeof(ip6_hdr));
+    if (bytes_read < sizeof(ip6_hdr)) {
+        return false;
+    }
+
+    *full_hdr_len = sizeof(struct ip6_header);
+
+    if (!eth_is_ip6_extension_header_type(ip6_hdr.ip6_nxt)) {
+        *l4proto = ip6_hdr.ip6_nxt;
+        return true;
+    }
+
+    do {
+        bytes_read = iov_to_buf(pkt, pkt_frags, ip6hdr_off + *full_hdr_len,
+                                &ext_hdr, sizeof(ext_hdr));
+        *full_hdr_len += (ext_hdr.ip6r_len + 1) * IP6_EXT_GRANULARITY;
+    } while (eth_is_ip6_extension_header_type(ext_hdr.ip6r_nxt));
+
+    *l4proto = ext_hdr.ip6r_nxt;
+    return true;
+}