/*
- * Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
+ * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <config.h>
#include "packets.h"
-#include <assert.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
+#include <netinet/ip6.h>
#include <stdlib.h>
#include "byte-order.h"
#include "csum.h"
void
ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s)
{
- ds_put_format(s, IP_FMT, IP_ARGS(&ip));
+ ds_put_format(s, IP_FMT, IP_ARGS(ip));
if (mask != htonl(UINT32_MAX)) {
if (ip_is_cidr(mask)) {
ds_put_format(s, "/%d", ip_count_cidr_bits(mask));
} else {
- ds_put_format(s, "/"IP_FMT, IP_ARGS(&mask));
+ ds_put_format(s, "/"IP_FMT, IP_ARGS(mask));
}
}
}
*addr = new_addr;
}
+/* Returns true, if packet contains at least one routing header where
+ * segements_left > 0.
+ *
+ * This function assumes that L3 and L4 markers are set in the packet. */
+static bool
+packet_rh_present(struct ofpbuf *packet)
+{
+ const struct ip6_hdr *nh;
+ int nexthdr;
+ size_t len;
+ size_t remaining;
+ uint8_t *data = packet->l3;
+
+ remaining = (uint8_t *)packet->l4 - (uint8_t *)packet->l3;
+
+ if (remaining < sizeof *nh) {
+ return false;
+ }
+ nh = (struct ip6_hdr *)data;
+ data += sizeof *nh;
+ remaining -= sizeof *nh;
+ nexthdr = nh->ip6_nxt;
+
+ while (1) {
+ if ((nexthdr != IPPROTO_HOPOPTS)
+ && (nexthdr != IPPROTO_ROUTING)
+ && (nexthdr != IPPROTO_DSTOPTS)
+ && (nexthdr != IPPROTO_AH)
+ && (nexthdr != IPPROTO_FRAGMENT)) {
+ /* It's either a terminal header (e.g., TCP, UDP) or one we
+ * don't understand. In either case, we're done with the
+ * packet, so use it to fill in 'nw_proto'. */
+ break;
+ }
+
+ /* We only verify that at least 8 bytes of the next header are
+ * available, but many of these headers are longer. Ensure that
+ * accesses within the extension header are within those first 8
+ * bytes. All extension headers are required to be at least 8
+ * bytes. */
+ if (remaining < 8) {
+ return false;
+ }
+
+ if (nexthdr == IPPROTO_AH) {
+ /* A standard AH definition isn't available, but the fields
+ * we care about are in the same location as the generic
+ * option header--only the header length is calculated
+ * differently. */
+ const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
+
+ nexthdr = ext_hdr->ip6e_nxt;
+ len = (ext_hdr->ip6e_len + 2) * 4;
+ } else if (nexthdr == IPPROTO_FRAGMENT) {
+ const struct ip6_frag *frag_hdr = (struct ip6_frag *)data;
+
+ nexthdr = frag_hdr->ip6f_nxt;
+ len = sizeof *frag_hdr;
+ } else if (nexthdr == IPPROTO_ROUTING) {
+ const struct ip6_rthdr *rh = (struct ip6_rthdr *)data;
+
+ if (rh->ip6r_segleft > 0) {
+ return true;
+ }
+
+ nexthdr = rh->ip6r_nxt;
+ len = (rh->ip6r_len + 1) * 8;
+ } else {
+ const struct ip6_ext *ext_hdr = (struct ip6_ext *)data;
+
+ nexthdr = ext_hdr->ip6e_nxt;
+ len = (ext_hdr->ip6e_len + 1) * 8;
+ }
+
+ if (remaining < len) {
+ return false;
+ }
+ remaining -= len;
+ data += len;
+ }
+
+ return false;
+}
+
+static void
+packet_update_csum128(struct ofpbuf *packet, uint8_t proto,
+ ovs_be32 addr[4], const ovs_be32 new_addr[4])
+{
+ if (proto == IPPROTO_TCP && packet->l7) {
+ struct tcp_header *th = packet->l4;
+
+ th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr);
+ } else if (proto == IPPROTO_UDP && packet->l7) {
+ struct udp_header *uh = packet->l4;
+
+ if (uh->udp_csum) {
+ uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr);
+ if (!uh->udp_csum) {
+ uh->udp_csum = htons(0xffff);
+ }
+ }
+ }
+}
+
+static void
+packet_set_ipv6_addr(struct ofpbuf *packet, uint8_t proto,
+ struct in6_addr *addr, const ovs_be32 new_addr[4],
+ bool recalculate_csum)
+{
+ if (recalculate_csum) {
+ packet_update_csum128(packet, proto, (ovs_be32 *)addr, new_addr);
+ }
+ memcpy(addr, new_addr, sizeof(*addr));
+}
+
+static void
+packet_set_ipv6_flow_label(ovs_be32 *flow_label, ovs_be32 flow_key)
+{
+ *flow_label = (*flow_label & htonl(~IPV6_LABEL_MASK)) | flow_key;
+}
+
+static void
+packet_set_ipv6_tc(ovs_be32 *flow_label, uint8_t tc)
+{
+ *flow_label = (*flow_label & htonl(0xF00FFFFF)) | htonl(tc << 20);
+}
+
/* Modifies the IPv4 header fields of 'packet' to be consistent with 'src',
* 'dst', 'tos', and 'ttl'. Updates 'packet''s L4 checksums as appropriate.
* 'packet' must contain a valid IPv4 packet with correctly populated l[347]
}
}
+/* Modifies the IPv6 header fields of 'packet' to be consistent with 'src',
+ * 'dst', 'traffic class', and 'next hop'. Updates 'packet''s L4 checksums as
+ * appropriate. 'packet' must contain a valid IPv6 packet with correctly
+ * populated l[347] markers. */
+void
+packet_set_ipv6(struct ofpbuf *packet, uint8_t proto, const ovs_be32 src[4],
+ const ovs_be32 dst[4], uint8_t key_tc, ovs_be32 key_fl,
+ uint8_t key_hl)
+{
+ struct ip6_hdr *nh = packet->l3;
+
+ if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) {
+ packet_set_ipv6_addr(packet, proto, &nh->ip6_src, src, true);
+ }
+
+ if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) {
+ packet_set_ipv6_addr(packet, proto, &nh->ip6_dst, dst,
+ !packet_rh_present(packet));
+ }
+
+ packet_set_ipv6_tc(&nh->ip6_flow, key_tc);
+
+ packet_set_ipv6_flow_label(&nh->ip6_flow, key_fl);
+
+ nh->ip6_hlim = key_hl;
+}
+
static void
packet_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum)
{
uint8_t
packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow)
{
- if ((flow->dl_type == htons(ETH_TYPE_IP) ||
- flow->dl_type == htons(ETH_TYPE_IPV6)) &&
- flow->nw_proto == IPPROTO_TCP && packet->l7) {
+ if (is_ip_any(flow) && flow->nw_proto == IPPROTO_TCP && packet->l7) {
const struct tcp_header *tcp = packet->l4;
return TCP_FLAGS(tcp->tcp_ctl);
} else {