/*
- * Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
+ * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 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 <netinet/icmp6.h>
#include <stdlib.h>
#include "byte-order.h"
#include "csum.h"
+#include "crc32c.h"
#include "flow.h"
+#include "hmap.h"
#include "dynamic-string.h"
-#include "ofpbuf.h"
+#include "ovs-thread.h"
+#include "odp-util.h"
+#include "dp-packet.h"
+#include "unaligned.h"
const struct in6_addr in6addr_exact = IN6ADDR_EXACT_INIT;
+const struct in6_addr in6addr_all_hosts = IN6ADDR_ALL_HOSTS_INIT;
+
+struct in6_addr
+flow_tnl_dst(const struct flow_tnl *tnl)
+{
+ return tnl->ip_dst ? in6_addr_mapped_ipv4(tnl->ip_dst) : tnl->ipv6_dst;
+}
+
+struct in6_addr
+flow_tnl_src(const struct flow_tnl *tnl)
+{
+ return tnl->ip_src ? in6_addr_mapped_ipv4(tnl->ip_src) : tnl->ipv6_src;
+}
/* Parses 's' as a 16-digit hexadecimal number representing a datapath ID. On
* success stores the dpid into '*dpidp' and returns true, on failure stores 0
return *dpidp != 0;
}
+/* Returns true if 'ea' is a reserved address, that a bridge must never
+ * forward, false otherwise.
+ *
+ * If you change this function's behavior, please update corresponding
+ * documentation in vswitch.xml at the same time. */
bool
-eth_addr_from_string(const char *s, uint8_t ea[ETH_ADDR_LEN])
+eth_addr_is_reserved(const struct eth_addr ea)
{
- if (sscanf(s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(ea))
- == ETH_ADDR_SCAN_COUNT) {
+ struct eth_addr_node {
+ struct hmap_node hmap_node;
+ const uint64_t ea64;
+ };
+
+ static struct eth_addr_node nodes[] = {
+ /* STP, IEEE pause frames, and other reserved protocols. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000000ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000001ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000002ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000003ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000004ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000005ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000006ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000007ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000008ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c2000009ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000aULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000bULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000cULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000dULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000eULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x0180c200000fULL },
+
+ /* Extreme protocols. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000000ULL }, /* EDP. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000004ULL }, /* EAPS. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x00e02b000006ULL }, /* EAPS. */
+
+ /* Cisco protocols. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000c000000ULL }, /* ISL. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccccULL }, /* PAgP, UDLD, CDP,
+ * DTP, VTP. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000ccccccdULL }, /* PVST+. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000ccdcdcdULL }, /* STP Uplink Fast,
+ * FlexLink. */
+
+ /* Cisco CFM. */
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc0ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc1ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc2ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc3ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc4ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc5ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc6ULL },
+ { HMAP_NODE_NULL_INITIALIZER, 0x01000cccccc7ULL },
+ };
+
+ static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
+ struct eth_addr_node *node;
+ static struct hmap addrs;
+ uint64_t ea64;
+
+ if (ovsthread_once_start(&once)) {
+ hmap_init(&addrs);
+ for (node = nodes; node < &nodes[ARRAY_SIZE(nodes)]; node++) {
+ hmap_insert(&addrs, &node->hmap_node, hash_uint64(node->ea64));
+ }
+ ovsthread_once_done(&once);
+ }
+
+ ea64 = eth_addr_to_uint64(ea);
+ HMAP_FOR_EACH_IN_BUCKET (node, hmap_node, hash_uint64(ea64), &addrs) {
+ if (node->ea64 == ea64) {
+ return true;
+ }
+ }
+ return false;
+}
+
+bool
+eth_addr_from_string(const char *s, struct eth_addr *ea)
+{
+ if (ovs_scan(s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(*ea))) {
return true;
} else {
- memset(ea, 0, ETH_ADDR_LEN);
+ *ea = eth_addr_zero;
return false;
}
}
-/* Fills 'b' with an 802.2 SNAP packet with Ethernet source address 'eth_src',
- * the Nicira OUI as SNAP organization and 'snap_type' as SNAP type. The text
- * string in 'tag' is enclosed as the packet payload.
- *
+/* Fills 'b' with a Reverse ARP packet with Ethernet source address 'eth_src'.
* This function is used by Open vSwitch to compose packets in cases where
- * context is important but content doesn't (or shouldn't) matter. For this
- * purpose, 'snap_type' should be a random number and 'tag' should be an
- * English phrase that explains the purpose of the packet. (The English phrase
- * gives hapless admins running Wireshark the opportunity to figure out what's
- * going on.) */
+ * context is important but content doesn't (or shouldn't) matter.
+ *
+ * The returned packet has enough headroom to insert an 802.1Q VLAN header if
+ * desired. */
void
-compose_benign_packet(struct ofpbuf *b, const char *tag, uint16_t snap_type,
- const uint8_t eth_src[ETH_ADDR_LEN])
+compose_rarp(struct dp_packet *b, const struct eth_addr eth_src)
{
- size_t tag_size = strlen(tag) + 1;
- char *payload;
-
- payload = snap_compose(b, eth_addr_broadcast, eth_src, 0x002320, snap_type,
- tag_size + ETH_ADDR_LEN);
- memcpy(payload, tag, tag_size);
- memcpy(payload + tag_size, eth_src, ETH_ADDR_LEN);
+ struct eth_header *eth;
+ struct arp_eth_header *arp;
+
+ dp_packet_clear(b);
+ dp_packet_prealloc_tailroom(b, 2 + ETH_HEADER_LEN + VLAN_HEADER_LEN
+ + ARP_ETH_HEADER_LEN);
+ dp_packet_reserve(b, 2 + VLAN_HEADER_LEN);
+ eth = dp_packet_put_uninit(b, sizeof *eth);
+ eth->eth_dst = eth_addr_broadcast;
+ eth->eth_src = eth_src;
+ eth->eth_type = htons(ETH_TYPE_RARP);
+
+ arp = dp_packet_put_uninit(b, sizeof *arp);
+ arp->ar_hrd = htons(ARP_HRD_ETHERNET);
+ arp->ar_pro = htons(ARP_PRO_IP);
+ arp->ar_hln = sizeof arp->ar_sha;
+ arp->ar_pln = sizeof arp->ar_spa;
+ arp->ar_op = htons(ARP_OP_RARP);
+ arp->ar_sha = eth_src;
+ put_16aligned_be32(&arp->ar_spa, htonl(0));
+ arp->ar_tha = eth_src;
+ put_16aligned_be32(&arp->ar_tpa, htonl(0));
+
+ dp_packet_reset_offsets(b);
+ dp_packet_set_l3(b, arp);
}
/* Insert VLAN header according to given TCI. Packet passed must be Ethernet
* packet. Ignores the CFI bit of 'tci' using 0 instead.
*
- * Also sets 'packet->l2' to point to the new Ethernet header. */
+ * Also adjusts the layer offsets accordingly. */
void
-eth_push_vlan(struct ofpbuf *packet, ovs_be16 tci)
+eth_push_vlan(struct dp_packet *packet, ovs_be16 tpid, ovs_be16 tci)
{
- struct eth_header *eh = packet->data;
struct vlan_eth_header *veh;
/* Insert new 802.1Q header. */
- struct vlan_eth_header tmp;
- memcpy(tmp.veth_dst, eh->eth_dst, ETH_ADDR_LEN);
- memcpy(tmp.veth_src, eh->eth_src, ETH_ADDR_LEN);
- tmp.veth_type = htons(ETH_TYPE_VLAN);
- tmp.veth_tci = tci & htons(~VLAN_CFI);
- tmp.veth_next_type = eh->eth_type;
-
- veh = ofpbuf_push_uninit(packet, VLAN_HEADER_LEN);
- memcpy(veh, &tmp, sizeof tmp);
-
- packet->l2 = packet->data;
+ veh = dp_packet_resize_l2(packet, VLAN_HEADER_LEN);
+ memmove(veh, (char *)veh + VLAN_HEADER_LEN, 2 * ETH_ADDR_LEN);
+ veh->veth_type = tpid;
+ veh->veth_tci = tci & htons(~VLAN_CFI);
}
/* Removes outermost VLAN header (if any is present) from 'packet'.
*
- * 'packet->l2' must initially point to 'packet''s Ethernet header. */
+ * 'packet->l2_5' should initially point to 'packet''s outer-most VLAN header
+ * or may be NULL if there are no VLAN headers. */
+void
+eth_pop_vlan(struct dp_packet *packet)
+{
+ struct vlan_eth_header *veh = dp_packet_l2(packet);
+
+ if (veh && dp_packet_size(packet) >= sizeof *veh
+ && eth_type_vlan(veh->veth_type)) {
+
+ memmove((char *)veh + VLAN_HEADER_LEN, veh, 2 * ETH_ADDR_LEN);
+ dp_packet_resize_l2(packet, -VLAN_HEADER_LEN);
+ }
+}
+
+/* Set ethertype of the packet. */
+static void
+set_ethertype(struct dp_packet *packet, ovs_be16 eth_type)
+{
+ struct eth_header *eh = dp_packet_l2(packet);
+
+ if (!eh) {
+ return;
+ }
+
+ if (eth_type_vlan(eh->eth_type)) {
+ ovs_be16 *p;
+ char *l2_5 = dp_packet_l2_5(packet);
+
+ p = ALIGNED_CAST(ovs_be16 *,
+ (l2_5 ? l2_5 : (char *)dp_packet_l3(packet)) - 2);
+ *p = eth_type;
+ } else {
+ eh->eth_type = eth_type;
+ }
+}
+
+static bool is_mpls(struct dp_packet *packet)
+{
+ return packet->l2_5_ofs != UINT16_MAX;
+}
+
+/* Set time to live (TTL) of an MPLS label stack entry (LSE). */
void
-eth_pop_vlan(struct ofpbuf *packet)
+set_mpls_lse_ttl(ovs_be32 *lse, uint8_t ttl)
{
- struct vlan_eth_header *veh = packet->l2;
- if (packet->size >= sizeof *veh
- && veh->veth_type == htons(ETH_TYPE_VLAN)) {
- struct eth_header tmp;
+ *lse &= ~htonl(MPLS_TTL_MASK);
+ *lse |= htonl((ttl << MPLS_TTL_SHIFT) & MPLS_TTL_MASK);
+}
- memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN);
- memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN);
- tmp.eth_type = veh->veth_next_type;
+/* Set traffic class (TC) of an MPLS label stack entry (LSE). */
+void
+set_mpls_lse_tc(ovs_be32 *lse, uint8_t tc)
+{
+ *lse &= ~htonl(MPLS_TC_MASK);
+ *lse |= htonl((tc << MPLS_TC_SHIFT) & MPLS_TC_MASK);
+}
- ofpbuf_pull(packet, VLAN_HEADER_LEN);
- packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN;
- memcpy(packet->data, &tmp, sizeof tmp);
+/* Set label of an MPLS label stack entry (LSE). */
+void
+set_mpls_lse_label(ovs_be32 *lse, ovs_be32 label)
+{
+ *lse &= ~htonl(MPLS_LABEL_MASK);
+ *lse |= htonl((ntohl(label) << MPLS_LABEL_SHIFT) & MPLS_LABEL_MASK);
+}
+
+/* Set bottom of stack (BoS) bit of an MPLS label stack entry (LSE). */
+void
+set_mpls_lse_bos(ovs_be32 *lse, uint8_t bos)
+{
+ *lse &= ~htonl(MPLS_BOS_MASK);
+ *lse |= htonl((bos << MPLS_BOS_SHIFT) & MPLS_BOS_MASK);
+}
+
+/* Compose an MPLS label stack entry (LSE) from its components:
+ * label, traffic class (TC), time to live (TTL) and
+ * bottom of stack (BoS) bit. */
+ovs_be32
+set_mpls_lse_values(uint8_t ttl, uint8_t tc, uint8_t bos, ovs_be32 label)
+{
+ ovs_be32 lse = htonl(0);
+ set_mpls_lse_ttl(&lse, ttl);
+ set_mpls_lse_tc(&lse, tc);
+ set_mpls_lse_bos(&lse, bos);
+ set_mpls_lse_label(&lse, label);
+ return lse;
+}
+
+/* Set MPLS label stack entry to outermost MPLS header.*/
+void
+set_mpls_lse(struct dp_packet *packet, ovs_be32 mpls_lse)
+{
+ /* Packet type should be MPLS to set label stack entry. */
+ if (is_mpls(packet)) {
+ struct mpls_hdr *mh = dp_packet_l2_5(packet);
+
+ /* Update mpls label stack entry. */
+ put_16aligned_be32(&mh->mpls_lse, mpls_lse);
+ }
+}
+
+/* Push MPLS label stack entry 'lse' onto 'packet' as the outermost MPLS
+ * header. If 'packet' does not already have any MPLS labels, then its
+ * Ethertype is changed to 'ethtype' (which must be an MPLS Ethertype). */
+void
+push_mpls(struct dp_packet *packet, ovs_be16 ethtype, ovs_be32 lse)
+{
+ char * header;
+ size_t len;
+
+ if (!eth_type_mpls(ethtype)) {
+ return;
+ }
+
+ if (!is_mpls(packet)) {
+ /* Set MPLS label stack offset. */
+ packet->l2_5_ofs = packet->l3_ofs;
+ }
+
+ set_ethertype(packet, ethtype);
+
+ /* Push new MPLS shim header onto packet. */
+ len = packet->l2_5_ofs;
+ header = dp_packet_resize_l2_5(packet, MPLS_HLEN);
+ memmove(header, header + MPLS_HLEN, len);
+ memcpy(header + len, &lse, sizeof lse);
+}
+
+/* If 'packet' is an MPLS packet, removes its outermost MPLS label stack entry.
+ * If the label that was removed was the only MPLS label, changes 'packet''s
+ * Ethertype to 'ethtype' (which ordinarily should not be an MPLS
+ * Ethertype). */
+void
+pop_mpls(struct dp_packet *packet, ovs_be16 ethtype)
+{
+ if (is_mpls(packet)) {
+ struct mpls_hdr *mh = dp_packet_l2_5(packet);
+ size_t len = packet->l2_5_ofs;
+
+ set_ethertype(packet, ethtype);
+ if (get_16aligned_be32(&mh->mpls_lse) & htonl(MPLS_BOS_MASK)) {
+ dp_packet_set_l2_5(packet, NULL);
+ }
+ /* Shift the l2 header forward. */
+ memmove((char*)dp_packet_data(packet) + MPLS_HLEN, dp_packet_data(packet), len);
+ dp_packet_resize_l2_5(packet, -MPLS_HLEN);
}
}
/* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The
* caller must free '*packetp'. On success, returns NULL. On failure, returns
- * an error message and stores NULL in '*packetp'. */
+ * an error message and stores NULL in '*packetp'.
+ *
+ * Aligns the L3 header of '*packetp' on a 32-bit boundary. */
const char *
-eth_from_hex(const char *hex, struct ofpbuf **packetp)
+eth_from_hex(const char *hex, struct dp_packet **packetp)
{
- struct ofpbuf *packet;
+ struct dp_packet *packet;
- packet = *packetp = ofpbuf_new(strlen(hex) / 2);
+ /* Use 2 bytes of headroom to 32-bit align the L3 header. */
+ packet = *packetp = dp_packet_new_with_headroom(strlen(hex) / 2, 2);
- if (ofpbuf_put_hex(packet, hex, NULL)[0] != '\0') {
- ofpbuf_delete(packet);
+ if (dp_packet_put_hex(packet, hex, NULL)[0] != '\0') {
+ dp_packet_delete(packet);
*packetp = NULL;
return "Trailing garbage in packet data";
}
- if (packet->size < ETH_HEADER_LEN) {
- ofpbuf_delete(packet);
+ if (dp_packet_size(packet) < ETH_HEADER_LEN) {
+ dp_packet_delete(packet);
*packetp = NULL;
return "Packet data too short for Ethernet";
}
return NULL;
}
+void
+eth_format_masked(const struct eth_addr eth,
+ const struct eth_addr *mask, struct ds *s)
+{
+ ds_put_format(s, ETH_ADDR_FMT, ETH_ADDR_ARGS(eth));
+ if (mask && !eth_mask_is_exact(*mask)) {
+ ds_put_format(s, "/"ETH_ADDR_FMT, ETH_ADDR_ARGS(*mask));
+ }
+}
+
/* Given the IP netmask 'netmask', returns the number of bits of the IP address
- * that it specifies, that is, the number of 1-bits in 'netmask'. 'netmask'
- * must be a CIDR netmask (see ip_is_cidr()). */
+ * that it specifies, that is, the number of 1-bits in 'netmask'.
+ *
+ * If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will
+ * still be in the valid range but isn't otherwise meaningful. */
int
ip_count_cidr_bits(ovs_be32 netmask)
{
- assert(ip_is_cidr(netmask));
- return 32 - ctz(ntohl(netmask));
+ return 32 - ctz32(ntohl(netmask));
}
void
ip_format_masked(ovs_be32 ip, ovs_be32 mask, struct ds *s)
{
- ds_put_format(s, IP_FMT, IP_ARGS(&ip));
- if (mask != htonl(UINT32_MAX)) {
+ ds_put_format(s, IP_FMT, IP_ARGS(ip));
+ if (mask != OVS_BE32_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));
}
}
}
+/* Parses string 's', which must be an IP address. Stores the IP address into
+ * '*ip'. Returns true if successful, otherwise false. */
+bool
+ip_parse(const char *s, ovs_be32 *ip)
+{
+ return inet_pton(AF_INET, s, ip) == 1;
+}
+
+/* Parses string 's', which must be an IP address with an optional netmask or
+ * CIDR prefix length. Stores the IP address into '*ip', netmask into '*mask',
+ * (255.255.255.255, if 's' lacks a netmask), and number of scanned characters
+ * into '*n'.
+ *
+ * Returns NULL if successful, otherwise an error message that the caller must
+ * free(). */
+char * OVS_WARN_UNUSED_RESULT
+ip_parse_masked_len(const char *s, int *n, ovs_be32 *ip,
+ ovs_be32 *mask)
+{
+ int prefix;
+
+ if (ovs_scan_len(s, n, IP_SCAN_FMT"/"IP_SCAN_FMT,
+ IP_SCAN_ARGS(ip), IP_SCAN_ARGS(mask))) {
+ /* OK. */
+ } else if (ovs_scan_len(s, n, IP_SCAN_FMT"/%d",
+ IP_SCAN_ARGS(ip), &prefix)) {
+ if (prefix <= 0 || prefix > 32) {
+ return xasprintf("%s: network prefix bits not between 0 and "
+ "32", s);
+ }
+ *mask = be32_prefix_mask(prefix);
+ } else if (ovs_scan_len(s, n, IP_SCAN_FMT, IP_SCAN_ARGS(ip))) {
+ *mask = OVS_BE32_MAX;
+ } else {
+ return xasprintf("%s: invalid IP address", s);
+ }
+ return NULL;
+}
+
+/* This function is similar to ip_parse_masked_len(), but doesn't return the
+ * number of scanned characters and expects 's' to end after the ip/(optional)
+ * mask.
+ *
+ * Returns NULL if successful, otherwise an error message that the caller must
+ * free(). */
+char * OVS_WARN_UNUSED_RESULT
+ip_parse_masked(const char *s, ovs_be32 *ip, ovs_be32 *mask)
+{
+ int n = 0;
+
+ char *error = ip_parse_masked_len(s, &n, ip, mask);
+ if (!error && s[n]) {
+ return xasprintf("%s: invalid IP address", s);
+ }
+ return error;
+}
+
+/* Similar to ip_parse_masked_len(), but the mask, if present, must be a CIDR
+ * mask and is returned as a prefix len in '*plen'. */
+char * OVS_WARN_UNUSED_RESULT
+ip_parse_cidr_len(const char *s, int *n, ovs_be32 *ip, unsigned int *plen)
+{
+ ovs_be32 mask;
+ char *error;
+
+ error = ip_parse_masked_len(s, n, ip, &mask);
+ if (error) {
+ return error;
+ }
+
+ if (!ip_is_cidr(mask)) {
+ return xasprintf("%s: CIDR network required", s);
+ }
+ *plen = ip_count_cidr_bits(mask);
+ return NULL;
+}
+
+/* Similar to ip_parse_cidr_len(), but doesn't return the number of scanned
+ * characters and expects 's' to be NULL terminated at the end of the
+ * ip/(optional) cidr. */
+char * OVS_WARN_UNUSED_RESULT
+ip_parse_cidr(const char *s, ovs_be32 *ip, unsigned int *plen)
+{
+ int n = 0;
+
+ char *error = ip_parse_cidr_len(s, &n, ip, plen);
+ if (!error && s[n]) {
+ return xasprintf("%s: invalid IP address", s);
+ }
+ return error;
+}
+
+/* Parses string 's', which must be an IPv6 address. Stores the IPv6 address
+ * into '*ip'. Returns true if successful, otherwise false. */
+bool
+ipv6_parse(const char *s, struct in6_addr *ip)
+{
+ return inet_pton(AF_INET6, s, ip) == 1;
+}
+
+/* Parses string 's', which must be an IPv6 address with an optional netmask or
+ * CIDR prefix length. Stores the IPv6 address into '*ip' and the netmask into
+ * '*mask' (if 's' does not contain a netmask, all-one-bits is assumed), and
+ * number of scanned characters into '*n'.
+ *
+ * Returns NULL if successful, otherwise an error message that the caller must
+ * free(). */
+char * OVS_WARN_UNUSED_RESULT
+ipv6_parse_masked_len(const char *s, int *n, struct in6_addr *ip,
+ struct in6_addr *mask)
+{
+ char ipv6_s[IPV6_SCAN_LEN + 1];
+ int prefix;
+
+ if (ovs_scan_len(s, n, " "IPV6_SCAN_FMT, ipv6_s)
+ && ipv6_parse(ipv6_s, ip)) {
+ if (ovs_scan_len(s, n, "/%d", &prefix)) {
+ if (prefix <= 0 || prefix > 128) {
+ return xasprintf("%s: IPv6 network prefix bits not between 0 "
+ "and 128", s);
+ }
+ *mask = ipv6_create_mask(prefix);
+ } else if (ovs_scan_len(s, n, "/"IPV6_SCAN_FMT, ipv6_s)) {
+ if (!ipv6_parse(ipv6_s, mask)) {
+ return xasprintf("%s: Invalid IPv6 mask", s);
+ }
+ /* OK. */
+ } else {
+ /* OK. No mask. */
+ *mask = in6addr_exact;
+ }
+ return NULL;
+ }
+ return xasprintf("%s: invalid IPv6 address", s);
+}
+
+/* This function is similar to ipv6_parse_masked_len(), but doesn't return the
+ * number of scanned characters and expects 's' to end following the
+ * ipv6/(optional) mask. */
+char * OVS_WARN_UNUSED_RESULT
+ipv6_parse_masked(const char *s, struct in6_addr *ip, struct in6_addr *mask)
+{
+ int n = 0;
+
+ char *error = ipv6_parse_masked_len(s, &n, ip, mask);
+ if (!error && s[n]) {
+ return xasprintf("%s: invalid IPv6 address", s);
+ }
+ return error;
+}
+
+/* Similar to ipv6_parse_masked_len(), but the mask, if present, must be a CIDR
+ * mask and is returned as a prefix length in '*plen'. */
+char * OVS_WARN_UNUSED_RESULT
+ipv6_parse_cidr_len(const char *s, int *n, struct in6_addr *ip,
+ unsigned int *plen)
+{
+ struct in6_addr mask;
+ char *error;
+
+ error = ipv6_parse_masked_len(s, n, ip, &mask);
+ if (error) {
+ return error;
+ }
+
+ if (!ipv6_is_cidr(&mask)) {
+ return xasprintf("%s: IPv6 CIDR network required", s);
+ }
+ *plen = ipv6_count_cidr_bits(&mask);
+ return NULL;
+}
+
+/* Similar to ipv6_parse_cidr_len(), but doesn't return the number of scanned
+ * characters and expects 's' to end after the ipv6/(optional) cidr. */
+char * OVS_WARN_UNUSED_RESULT
+ipv6_parse_cidr(const char *s, struct in6_addr *ip, unsigned int *plen)
+{
+ int n = 0;
+
+ char *error = ipv6_parse_cidr_len(s, &n, ip, plen);
+ if (!error && s[n]) {
+ return xasprintf("%s: invalid IPv6 address", s);
+ }
+ return error;
+}
/* Stores the string representation of the IPv6 address 'addr' into the
* character array 'addr_str', which must be at least INET6_ADDRSTRLEN
* bytes long. */
void
-format_ipv6_addr(char *addr_str, const struct in6_addr *addr)
+ipv6_format_addr(const struct in6_addr *addr, struct ds *s)
{
- inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN);
+ char *dst;
+
+ ds_reserve(s, s->length + INET6_ADDRSTRLEN);
+
+ dst = s->string + s->length;
+ inet_ntop(AF_INET6, addr, dst, INET6_ADDRSTRLEN);
+ s->length += strlen(dst);
}
+/* Same as print_ipv6_addr, but optionally encloses the address in square
+ * brackets. */
void
-print_ipv6_addr(struct ds *string, const struct in6_addr *addr)
+ipv6_format_addr_bracket(const struct in6_addr *addr, struct ds *s,
+ bool bracket)
{
- char *dst;
-
- ds_reserve(string, string->length + INET6_ADDRSTRLEN);
+ if (bracket) {
+ ds_put_char(s, '[');
+ }
+ ipv6_format_addr(addr, s);
+ if (bracket) {
+ ds_put_char(s, ']');
+ }
+}
- dst = string->string + string->length;
- format_ipv6_addr(dst, addr);
- string->length += strlen(dst);
+void
+ipv6_format_mapped(const struct in6_addr *addr, struct ds *s)
+{
+ if (IN6_IS_ADDR_V4MAPPED(addr)) {
+ ds_put_format(s, IP_FMT, addr->s6_addr[12], addr->s6_addr[13],
+ addr->s6_addr[14], addr->s6_addr[15]);
+ } else {
+ ipv6_format_addr(addr, s);
+ }
}
void
-print_ipv6_masked(struct ds *s, const struct in6_addr *addr,
- const struct in6_addr *mask)
+ipv6_format_masked(const struct in6_addr *addr, const struct in6_addr *mask,
+ struct ds *s)
{
- print_ipv6_addr(s, addr);
+ ipv6_format_addr(addr, s);
if (mask && !ipv6_mask_is_exact(mask)) {
if (ipv6_is_cidr(mask)) {
int cidr_bits = ipv6_count_cidr_bits(mask);
ds_put_format(s, "/%d", cidr_bits);
} else {
ds_put_char(s, '/');
- print_ipv6_addr(s, mask);
+ ipv6_format_addr(mask, s);
}
}
}
+/* Stores the string representation of the IPv6 address 'addr' into the
+ * character array 'addr_str', which must be at least INET6_ADDRSTRLEN
+ * bytes long. If addr is IPv4-mapped, store an IPv4 dotted-decimal string. */
+const char *
+ipv6_string_mapped(char *addr_str, const struct in6_addr *addr)
+{
+ ovs_be32 ip;
+ ip = in6_addr_get_mapped_ipv4(addr);
+ if (ip) {
+ return inet_ntop(AF_INET, &ip, addr_str, INET6_ADDRSTRLEN);
+ } else {
+ return inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN);
+ }
+}
+
struct in6_addr ipv6_addr_bitand(const struct in6_addr *a,
const struct in6_addr *b)
{
/* Given the IPv6 netmask 'netmask', returns the number of bits of the IPv6
* address that it specifies, that is, the number of 1-bits in 'netmask'.
- * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()). */
+ * 'netmask' must be a CIDR netmask (see ipv6_is_cidr()).
+ *
+ * If 'netmask' is not a CIDR netmask (see ipv6_is_cidr()), the return value
+ * will still be in the valid range but isn't otherwise meaningful. */
int
ipv6_count_cidr_bits(const struct in6_addr *netmask)
{
int count = 0;
const uint8_t *netmaskp = &netmask->s6_addr[0];
- assert(ipv6_is_cidr(netmask));
-
for (i=0; i<16; i++) {
if (netmaskp[i] == 0xff) {
count += 8;
/* Populates 'b' with an Ethernet II packet headed with the given 'eth_dst',
* 'eth_src' and 'eth_type' parameters. A payload of 'size' bytes is allocated
* in 'b' and returned. This payload may be populated with appropriate
- * information by the caller. Sets 'b''s 'l2' and 'l3' pointers to the
- * Ethernet header and payload respectively.
+ * information by the caller. Sets 'b''s 'frame' pointer and 'l3' offset to
+ * the Ethernet header and payload respectively. Aligns b->l3 on a 32-bit
+ * boundary.
*
* The returned packet has enough headroom to insert an 802.1Q VLAN header if
* desired. */
void *
-eth_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN],
- const uint8_t eth_src[ETH_ADDR_LEN], uint16_t eth_type,
+eth_compose(struct dp_packet *b, const struct eth_addr eth_dst,
+ const struct eth_addr eth_src, uint16_t eth_type,
size_t size)
{
void *data;
struct eth_header *eth;
- ofpbuf_clear(b);
+ dp_packet_clear(b);
- ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN + size);
- ofpbuf_reserve(b, VLAN_HEADER_LEN);
- eth = ofpbuf_put_uninit(b, ETH_HEADER_LEN);
- data = ofpbuf_put_uninit(b, size);
+ /* The magic 2 here ensures that the L3 header (when it is added later)
+ * will be 32-bit aligned. */
+ dp_packet_prealloc_tailroom(b, 2 + ETH_HEADER_LEN + VLAN_HEADER_LEN + size);
+ dp_packet_reserve(b, 2 + VLAN_HEADER_LEN);
+ eth = dp_packet_put_uninit(b, ETH_HEADER_LEN);
+ data = dp_packet_put_uninit(b, size);
- memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
- memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
+ eth->eth_dst = eth_dst;
+ eth->eth_src = eth_src;
eth->eth_type = htons(eth_type);
- b->l2 = eth;
- b->l3 = data;
+ dp_packet_reset_offsets(b);
+ dp_packet_set_l3(b, data);
return data;
}
-/* Populates 'b' with an Ethernet LLC+SNAP packet headed with the given
- * 'eth_dst', 'eth_src', 'snap_org', and 'snap_type'. A payload of 'size'
- * bytes is allocated in 'b' and returned. This payload may be populated with
- * appropriate information by the caller.
+static void
+packet_set_ipv4_addr(struct dp_packet *packet,
+ ovs_16aligned_be32 *addr, ovs_be32 new_addr)
+{
+ struct ip_header *nh = dp_packet_l3(packet);
+ ovs_be32 old_addr = get_16aligned_be32(addr);
+ size_t l4_size = dp_packet_l4_size(packet);
+
+ if (nh->ip_proto == IPPROTO_TCP && l4_size >= TCP_HEADER_LEN) {
+ struct tcp_header *th = dp_packet_l4(packet);
+
+ th->tcp_csum = recalc_csum32(th->tcp_csum, old_addr, new_addr);
+ } else if (nh->ip_proto == IPPROTO_UDP && l4_size >= UDP_HEADER_LEN ) {
+ struct udp_header *uh = dp_packet_l4(packet);
+
+ if (uh->udp_csum) {
+ uh->udp_csum = recalc_csum32(uh->udp_csum, old_addr, new_addr);
+ if (!uh->udp_csum) {
+ uh->udp_csum = htons(0xffff);
+ }
+ }
+ }
+ nh->ip_csum = recalc_csum32(nh->ip_csum, old_addr, new_addr);
+ put_16aligned_be32(addr, new_addr);
+}
+
+/* Returns true, if packet contains at least one routing header where
+ * segements_left > 0.
*
- * The returned packet has enough headroom to insert an 802.1Q VLAN header if
- * desired. */
-void *
-snap_compose(struct ofpbuf *b, const uint8_t eth_dst[ETH_ADDR_LEN],
- const uint8_t eth_src[ETH_ADDR_LEN],
- unsigned int oui, uint16_t snap_type, size_t size)
+ * This function assumes that L3 and L4 offsets are set in the packet. */
+static bool
+packet_rh_present(struct dp_packet *packet)
{
- struct eth_header *eth;
- struct llc_snap_header *llc_snap;
- void *payload;
-
- /* Compose basic packet structure. (We need the payload size to stick into
- * the 802.2 header.) */
- ofpbuf_clear(b);
- ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN
- + LLC_SNAP_HEADER_LEN + size);
- ofpbuf_reserve(b, VLAN_HEADER_LEN);
- eth = ofpbuf_put_zeros(b, ETH_HEADER_LEN);
- llc_snap = ofpbuf_put_zeros(b, LLC_SNAP_HEADER_LEN);
- payload = ofpbuf_put_uninit(b, size);
-
- /* Compose 802.2 header. */
- memcpy(eth->eth_dst, eth_dst, ETH_ADDR_LEN);
- memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
- eth->eth_type = htons(b->size - ETH_HEADER_LEN);
-
- /* Compose LLC, SNAP headers. */
- llc_snap->llc.llc_dsap = LLC_DSAP_SNAP;
- llc_snap->llc.llc_ssap = LLC_SSAP_SNAP;
- llc_snap->llc.llc_cntl = LLC_CNTL_SNAP;
- llc_snap->snap.snap_org[0] = oui >> 16;
- llc_snap->snap.snap_org[1] = oui >> 8;
- llc_snap->snap.snap_org[2] = oui;
- llc_snap->snap.snap_type = htons(snap_type);
-
- return payload;
+ const struct ovs_16aligned_ip6_hdr *nh;
+ int nexthdr;
+ size_t len;
+ size_t remaining;
+ uint8_t *data = dp_packet_l3(packet);
+
+ remaining = packet->l4_ofs - packet->l3_ofs;
+
+ if (remaining < sizeof *nh) {
+ return false;
+ }
+ nh = ALIGNED_CAST(struct ovs_16aligned_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 ovs_16aligned_ip6_frag *frag_hdr
+ = ALIGNED_CAST(struct ovs_16aligned_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_set_ipv4_addr(struct ofpbuf *packet, ovs_be32 *addr, ovs_be32 new_addr)
+packet_update_csum128(struct dp_packet *packet, uint8_t proto,
+ ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4])
{
- struct ip_header *nh = packet->l3;
+ size_t l4_size = dp_packet_l4_size(packet);
- if (nh->ip_proto == IPPROTO_TCP && packet->l7) {
- struct tcp_header *th = packet->l4;
+ if (proto == IPPROTO_TCP && l4_size >= TCP_HEADER_LEN) {
+ struct tcp_header *th = dp_packet_l4(packet);
- th->tcp_csum = recalc_csum32(th->tcp_csum, *addr, new_addr);
- } else if (nh->ip_proto == IPPROTO_UDP && packet->l7) {
- struct udp_header *uh = packet->l4;
+ th->tcp_csum = recalc_csum128(th->tcp_csum, addr, new_addr);
+ } else if (proto == IPPROTO_UDP && l4_size >= UDP_HEADER_LEN) {
+ struct udp_header *uh = dp_packet_l4(packet);
if (uh->udp_csum) {
- uh->udp_csum = recalc_csum32(uh->udp_csum, *addr, new_addr);
+ uh->udp_csum = recalc_csum128(uh->udp_csum, addr, new_addr);
if (!uh->udp_csum) {
uh->udp_csum = htons(0xffff);
}
}
+ } else if (proto == IPPROTO_ICMPV6 &&
+ l4_size >= sizeof(struct icmp6_header)) {
+ struct icmp6_header *icmp = dp_packet_l4(packet);
+
+ icmp->icmp6_cksum = recalc_csum128(icmp->icmp6_cksum, addr, new_addr);
+ }
+}
+
+static void
+packet_set_ipv6_addr(struct dp_packet *packet, uint8_t proto,
+ ovs_16aligned_be32 addr[4], const ovs_be32 new_addr[4],
+ bool recalculate_csum)
+{
+ if (recalculate_csum) {
+ packet_update_csum128(packet, proto, addr, new_addr);
}
- nh->ip_csum = recalc_csum32(nh->ip_csum, *addr, new_addr);
- *addr = new_addr;
+ memcpy(addr, new_addr, sizeof(ovs_be32[4]));
+}
+
+static void
+packet_set_ipv6_flow_label(ovs_16aligned_be32 *flow_label, ovs_be32 flow_key)
+{
+ ovs_be32 old_label = get_16aligned_be32(flow_label);
+ ovs_be32 new_label = (old_label & htonl(~IPV6_LABEL_MASK)) | flow_key;
+ put_16aligned_be32(flow_label, new_label);
+}
+
+static void
+packet_set_ipv6_tc(ovs_16aligned_be32 *flow_label, uint8_t tc)
+{
+ ovs_be32 old_label = get_16aligned_be32(flow_label);
+ ovs_be32 new_label = (old_label & htonl(0xF00FFFFF)) | htonl(tc << 20);
+ put_16aligned_be32(flow_label, new_label);
}
/* Modifies the IPv4 header fields of 'packet' to be consistent with 'src',
* 'packet' must contain a valid IPv4 packet with correctly populated l[347]
* markers. */
void
-packet_set_ipv4(struct ofpbuf *packet, ovs_be32 src, ovs_be32 dst,
+packet_set_ipv4(struct dp_packet *packet, ovs_be32 src, ovs_be32 dst,
uint8_t tos, uint8_t ttl)
{
- struct ip_header *nh = packet->l3;
+ struct ip_header *nh = dp_packet_l3(packet);
- if (nh->ip_src != src) {
+ if (get_16aligned_be32(&nh->ip_src) != src) {
packet_set_ipv4_addr(packet, &nh->ip_src, src);
}
- if (nh->ip_dst != dst) {
+ if (get_16aligned_be32(&nh->ip_dst) != dst) {
packet_set_ipv4_addr(packet, &nh->ip_dst, dst);
}
}
}
+/* 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[34] offsets. */
+void
+packet_set_ipv6(struct dp_packet *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 ovs_16aligned_ip6_hdr *nh = dp_packet_l3(packet);
+
+ if (memcmp(&nh->ip6_src, src, sizeof(ovs_be32[4]))) {
+ packet_set_ipv6_addr(packet, proto, nh->ip6_src.be32, src, true);
+ }
+
+ if (memcmp(&nh->ip6_dst, dst, sizeof(ovs_be32[4]))) {
+ packet_set_ipv6_addr(packet, proto, nh->ip6_dst.be32, 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)
{
/* Sets the TCP source and destination port ('src' and 'dst' respectively) of
* the TCP header contained in 'packet'. 'packet' must be a valid TCP packet
- * with its l4 marker properly populated. */
+ * with its l4 offset properly populated. */
void
-packet_set_tcp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
+packet_set_tcp_port(struct dp_packet *packet, ovs_be16 src, ovs_be16 dst)
{
- struct tcp_header *th = packet->l4;
+ struct tcp_header *th = dp_packet_l4(packet);
packet_set_port(&th->tcp_src, src, &th->tcp_csum);
packet_set_port(&th->tcp_dst, dst, &th->tcp_csum);
/* Sets the UDP source and destination port ('src' and 'dst' respectively) of
* the UDP header contained in 'packet'. 'packet' must be a valid UDP packet
- * with its l4 marker properly populated. */
+ * with its l4 offset properly populated. */
void
-packet_set_udp_port(struct ofpbuf *packet, ovs_be16 src, ovs_be16 dst)
+packet_set_udp_port(struct dp_packet *packet, ovs_be16 src, ovs_be16 dst)
{
- struct udp_header *uh = packet->l4;
+ struct udp_header *uh = dp_packet_l4(packet);
if (uh->udp_csum) {
packet_set_port(&uh->udp_src, src, &uh->udp_csum);
}
}
-/* If 'packet' is a TCP packet, returns the TCP flags. Otherwise, returns 0.
- *
- * 'flow' must be the flow corresponding to 'packet' and 'packet''s header
- * pointers must be properly initialized (e.g. with flow_extract()). */
-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) {
- const struct tcp_header *tcp = packet->l4;
- return TCP_FLAGS(tcp->tcp_ctl);
- } else {
- return 0;
+/* Sets the SCTP source and destination port ('src' and 'dst' respectively) of
+ * the SCTP header contained in 'packet'. 'packet' must be a valid SCTP packet
+ * with its l4 offset properly populated. */
+void
+packet_set_sctp_port(struct dp_packet *packet, ovs_be16 src, ovs_be16 dst)
+{
+ struct sctp_header *sh = dp_packet_l4(packet);
+ ovs_be32 old_csum, old_correct_csum, new_csum;
+ uint16_t tp_len = dp_packet_l4_size(packet);
+
+ old_csum = get_16aligned_be32(&sh->sctp_csum);
+ put_16aligned_be32(&sh->sctp_csum, 0);
+ old_correct_csum = crc32c((void *)sh, tp_len);
+
+ sh->sctp_src = src;
+ sh->sctp_dst = dst;
+
+ new_csum = crc32c((void *)sh, tp_len);
+ put_16aligned_be32(&sh->sctp_csum, old_csum ^ old_correct_csum ^ new_csum);
+}
+
+/* Sets the ICMP type and code of the ICMP header contained in 'packet'.
+ * 'packet' must be a valid ICMP packet with its l4 offset properly
+ * populated. */
+void
+packet_set_icmp(struct dp_packet *packet, uint8_t type, uint8_t code)
+{
+ struct icmp_header *ih = dp_packet_l4(packet);
+ ovs_be16 orig_tc = htons(ih->icmp_type << 8 | ih->icmp_code);
+ ovs_be16 new_tc = htons(type << 8 | code);
+
+ if (orig_tc != new_tc) {
+ ih->icmp_type = type;
+ ih->icmp_code = code;
+
+ ih->icmp_csum = recalc_csum16(ih->icmp_csum, orig_tc, new_tc);
+ }
+}
+
+void
+packet_set_nd(struct dp_packet *packet, const ovs_be32 target[4],
+ const struct eth_addr sll, const struct eth_addr tll) {
+ struct ovs_nd_msg *ns;
+ struct ovs_nd_opt *nd_opt;
+ int bytes_remain = dp_packet_l4_size(packet);
+
+ if (OVS_UNLIKELY(bytes_remain < sizeof(*ns))) {
+ return;
+ }
+
+ ns = dp_packet_l4(packet);
+ nd_opt = &ns->options[0];
+ bytes_remain -= sizeof(*ns);
+
+ if (memcmp(&ns->target, target, sizeof(ovs_be32[4]))) {
+ packet_set_ipv6_addr(packet, IPPROTO_ICMPV6,
+ ns->target.be32,
+ target, true);
+ }
+
+ while (bytes_remain >= ND_OPT_LEN && nd_opt->nd_opt_len != 0) {
+ if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR
+ && nd_opt->nd_opt_len == 1) {
+ if (!eth_addr_equals(nd_opt->nd_opt_mac, sll)) {
+ ovs_be16 *csum = &(ns->icmph.icmp6_cksum);
+
+ *csum = recalc_csum48(*csum, nd_opt->nd_opt_mac, sll);
+ nd_opt->nd_opt_mac = sll;
+ }
+
+ /* A packet can only contain one SLL or TLL option */
+ break;
+ } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR
+ && nd_opt->nd_opt_len == 1) {
+ if (!eth_addr_equals(nd_opt->nd_opt_mac, tll)) {
+ ovs_be16 *csum = &(ns->icmph.icmp6_cksum);
+
+ *csum = recalc_csum48(*csum, nd_opt->nd_opt_mac, tll);
+ nd_opt->nd_opt_mac = tll;
+ }
+
+ /* A packet can only contain one SLL or TLL option */
+ break;
+ }
+
+ nd_opt += nd_opt->nd_opt_len;
+ bytes_remain -= nd_opt->nd_opt_len * ND_OPT_LEN;
+ }
+}
+
+const char *
+packet_tcp_flag_to_string(uint32_t flag)
+{
+ switch (flag) {
+ case TCP_FIN:
+ return "fin";
+ case TCP_SYN:
+ return "syn";
+ case TCP_RST:
+ return "rst";
+ case TCP_PSH:
+ return "psh";
+ case TCP_ACK:
+ return "ack";
+ case TCP_URG:
+ return "urg";
+ case TCP_ECE:
+ return "ece";
+ case TCP_CWR:
+ return "cwr";
+ case TCP_NS:
+ return "ns";
+ case 0x200:
+ return "[200]";
+ case 0x400:
+ return "[400]";
+ case 0x800:
+ return "[800]";
+ default:
+ return NULL;
}
}
/* Appends a string representation of the TCP flags value 'tcp_flags'
- * (e.g. obtained via packet_get_tcp_flags() or TCP_FLAGS) to 's', in the
+ * (e.g. from struct flow.tcp_flags or obtained via TCP_FLAGS) to 's', in the
* format used by tcpdump. */
void
-packet_format_tcp_flags(struct ds *s, uint8_t tcp_flags)
+packet_format_tcp_flags(struct ds *s, uint16_t tcp_flags)
{
if (!tcp_flags) {
ds_put_cstr(s, "none");
if (tcp_flags & TCP_ACK) {
ds_put_char(s, '.');
}
- if (tcp_flags & 0x40) {
- ds_put_cstr(s, "[40]");
+ if (tcp_flags & TCP_ECE) {
+ ds_put_cstr(s, "E");
+ }
+ if (tcp_flags & TCP_CWR) {
+ ds_put_cstr(s, "C");
}
- if (tcp_flags & 0x80) {
- ds_put_cstr(s, "[80]");
+ if (tcp_flags & TCP_NS) {
+ ds_put_cstr(s, "N");
}
+ if (tcp_flags & 0x200) {
+ ds_put_cstr(s, "[200]");
+ }
+ if (tcp_flags & 0x400) {
+ ds_put_cstr(s, "[400]");
+ }
+ if (tcp_flags & 0x800) {
+ ds_put_cstr(s, "[800]");
+ }
+}
+
+#define ARP_PACKET_SIZE (2 + ETH_HEADER_LEN + VLAN_HEADER_LEN + \
+ ARP_ETH_HEADER_LEN)
+
+/* Clears 'b' and replaces its contents by an ARP frame with the specified
+ * 'arp_op', 'arp_sha', 'arp_tha', 'arp_spa', and 'arp_tpa'. The outer
+ * Ethernet frame is initialized with Ethernet source 'arp_sha' and destination
+ * 'arp_tha', except that destination ff:ff:ff:ff:ff:ff is used instead if
+ * 'broadcast' is true. */
+void
+compose_arp(struct dp_packet *b, uint16_t arp_op,
+ const struct eth_addr arp_sha, const struct eth_addr arp_tha,
+ bool broadcast, ovs_be32 arp_spa, ovs_be32 arp_tpa)
+{
+ struct eth_header *eth;
+ struct arp_eth_header *arp;
+
+ dp_packet_clear(b);
+ dp_packet_prealloc_tailroom(b, ARP_PACKET_SIZE);
+ dp_packet_reserve(b, 2 + VLAN_HEADER_LEN);
+
+ eth = dp_packet_put_uninit(b, sizeof *eth);
+ eth->eth_dst = broadcast ? eth_addr_broadcast : arp_tha;
+ eth->eth_src = arp_sha;
+ eth->eth_type = htons(ETH_TYPE_ARP);
+
+ arp = dp_packet_put_uninit(b, sizeof *arp);
+ arp->ar_hrd = htons(ARP_HRD_ETHERNET);
+ arp->ar_pro = htons(ARP_PRO_IP);
+ arp->ar_hln = sizeof arp->ar_sha;
+ arp->ar_pln = sizeof arp->ar_spa;
+ arp->ar_op = htons(arp_op);
+ arp->ar_sha = arp_sha;
+ arp->ar_tha = arp_tha;
+
+ put_16aligned_be32(&arp->ar_spa, arp_spa);
+ put_16aligned_be32(&arp->ar_tpa, arp_tpa);
+
+ dp_packet_reset_offsets(b);
+ dp_packet_set_l3(b, arp);
+}
+
+void
+compose_nd(struct dp_packet *b, const struct eth_addr eth_src,
+ struct in6_addr * ipv6_src, struct in6_addr * ipv6_dst)
+{
+ struct in6_addr sn_addr;
+ struct eth_addr eth_dst;
+ struct ovs_nd_msg *ns;
+ struct ovs_nd_opt *nd_opt;
+
+ in6_addr_solicited_node(&sn_addr, ipv6_dst);
+ ipv6_multicast_to_ethernet(ð_dst, &sn_addr);
+
+ eth_compose(b, eth_dst, eth_src, ETH_TYPE_IPV6,
+ IPV6_HEADER_LEN + ICMP6_HEADER_LEN + ND_OPT_LEN);
+ packet_set_ipv6(b, IPPROTO_ICMPV6,
+ ALIGNED_CAST(ovs_be32 *, ipv6_src->s6_addr),
+ ALIGNED_CAST(ovs_be32 *, sn_addr.s6_addr),
+ 0, 0, 255);
+
+ ns = dp_packet_l4(b);
+ nd_opt = &ns->options[0];
+
+ ns->icmph.icmp6_type = ND_NEIGHBOR_SOLICIT;
+ ns->icmph.icmp6_code = 0;
+
+ nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
+ packet_set_nd(b, ALIGNED_CAST(ovs_be32 *, ipv6_dst->s6_addr),
+ eth_src, eth_addr_zero);
}
+
+uint32_t
+packet_csum_pseudoheader(const struct ip_header *ip)
+{
+ uint32_t partial = 0;
+
+ partial = csum_add32(partial, get_16aligned_be32(&ip->ip_src));
+ partial = csum_add32(partial, get_16aligned_be32(&ip->ip_dst));
+ partial = csum_add16(partial, htons(ip->ip_proto));
+ partial = csum_add16(partial, htons(ntohs(ip->ip_tot_len) -
+ IP_IHL(ip->ip_ihl_ver) * 4));
+
+ return partial;
+}
+
+#ifndef __CHECKER__
+uint32_t
+packet_csum_pseudoheader6(const struct ovs_16aligned_ip6_hdr *ip6)
+{
+ uint32_t partial = 0;
+
+ partial = csum_add32(partial, get_16aligned_be32(&(ip6->ip6_src.be32[0])));
+ partial = csum_add32(partial, get_16aligned_be32(&(ip6->ip6_src.be32[1])));
+ partial = csum_add32(partial, get_16aligned_be32(&(ip6->ip6_src.be32[2])));
+ partial = csum_add32(partial, get_16aligned_be32(&(ip6->ip6_src.be32[3])));
+ partial = csum_add32(partial, get_16aligned_be32(&(ip6->ip6_dst.be32[0])));
+ partial = csum_add32(partial, get_16aligned_be32(&(ip6->ip6_dst.be32[1])));
+ partial = csum_add32(partial, get_16aligned_be32(&(ip6->ip6_dst.be32[2])));
+ partial = csum_add32(partial, get_16aligned_be32(&(ip6->ip6_dst.be32[3])));
+
+ partial = csum_add16(partial, 0);
+ partial = csum_add16(partial, ip6->ip6_plen);
+ partial = csum_add16(partial, 0);
+ partial = csum_add16(partial, ip6->ip6_nxt);
+
+ return partial;
+}
+#endif
projects / cascardo / ovs.git / blobdiff