--- /dev/null
+/*
+ * 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 */
+ g_assert_not_reached();
+
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff