/*
- * Copyright (c) 2009, 2010, 2011, 2012 Nicira Networks.
+ * Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
return *dpidp != 0;
}
+/* Returns true if 'ea' is a reserved multicast address, that a bridge must
+ * never forward, false otherwise. Includes some proprietary vendor protocols
+ * that shouldn't be forwarded as well.
+ *
+ * If you change this function's behavior, please update corresponding
+ * documentation in vswitch.xml at the same time. */
+bool
+eth_addr_is_reserved(const uint8_t ea[ETH_ADDR_LEN])
+{
+ struct masked_eth_addr {
+ uint8_t ea[ETH_ADDR_LEN];
+ uint8_t mask[ETH_ADDR_LEN];
+ };
+
+ static struct masked_eth_addr mea[] = {
+ { /* STP, IEEE pause frames, and other reserved protocols. */
+ {0x01, 0x08, 0xc2, 0x00, 0x00, 0x00},
+ {0xff, 0xff, 0xff, 0xff, 0xff, 0xf0}},
+
+ { /* VRRP IPv4. */
+ {0x00, 0x00, 0x5e, 0x00, 0x01, 0x00},
+ {0xff, 0xff, 0xff, 0xff, 0xff, 0x00}},
+
+ { /* VRRP IPv6. */
+ {0x00, 0x00, 0x5e, 0x00, 0x02, 0x00},
+ {0xff, 0xff, 0xff, 0xff, 0xff, 0x00}},
+
+ { /* HSRPv1. */
+ {0x00, 0x00, 0x0c, 0x07, 0xac, 0x00},
+ {0xff, 0xff, 0xff, 0xff, 0xff, 0x00}},
+
+ { /* HSRPv2. */
+ {0x00, 0x00, 0x0c, 0x9f, 0xf0, 0x00},
+ {0xff, 0xff, 0xff, 0xff, 0xf0, 0x00}},
+
+ { /* GLBP. */
+ {0x00, 0x07, 0xb4, 0x00, 0x00, 0x00},
+ {0xff, 0xff, 0xff, 0x00, 0x00, 0x00}},
+
+ { /* Extreme Discovery Protocol. */
+ {0x00, 0xE0, 0x2B, 0x00, 0x00, 0x00},
+ {0xff, 0xff, 0xff, 0xff, 0xf0, 0x00}},
+
+ { /* Cisco Inter Switch Link. */
+ {0x01, 0x00, 0x0c, 0x00, 0x00, 0x00},
+ {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
+
+ { /* Cisco protocols plus others following the same pattern:
+ *
+ * CDP, VTP, DTP, PAgP (01-00-0c-cc-cc-cc)
+ * Spanning Tree PVSTP+ (01-00-0c-cc-cc-cd)
+ * STP Uplink Fast (01-00-0c-cd-cd-cd) */
+ {0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc},
+ {0xff, 0xff, 0xff, 0xfe, 0xfe, 0xfe}}};
+
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(mea); i++) {
+ if (eth_addr_equal_except(ea, mea[i].ea, mea[i].mask)) {
+ return true;
+ }
+ }
+ return false;
+}
+
bool
eth_addr_from_string(const char *s, uint8_t ea[ETH_ADDR_LEN])
{
}
}
-/* 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_benign_packet(struct ofpbuf *b, const uint8_t eth_src[ETH_ADDR_LEN])
{
- size_t tag_size = strlen(tag) + 1;
- char *payload;
+ struct eth_header *eth;
+ struct rarp_header *rarp;
- 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);
+ ofpbuf_clear(b);
+ ofpbuf_prealloc_tailroom(b, ETH_HEADER_LEN + VLAN_HEADER_LEN
+ + RARP_HEADER_LEN);
+ ofpbuf_reserve(b, VLAN_HEADER_LEN);
+ eth = ofpbuf_put_uninit(b, sizeof *eth);
+ memcpy(eth->eth_dst, eth_addr_broadcast, ETH_ADDR_LEN);
+ memcpy(eth->eth_src, eth_src, ETH_ADDR_LEN);
+ eth->eth_type = htons(ETH_TYPE_RARP);
+
+ rarp = ofpbuf_put_uninit(b, sizeof *rarp);
+ rarp->hw_addr_space = htons(ARP_HTYPE_ETH);
+ rarp->proto_addr_space = htons(ETH_TYPE_IP);
+ rarp->hw_addr_length = ETH_ADDR_LEN;
+ rarp->proto_addr_length = sizeof rarp->src_proto_addr;
+ rarp->opcode = htons(RARP_REQUEST_REVERSE);
+ memcpy(rarp->src_hw_addr, eth_src, ETH_ADDR_LEN);
+ rarp->src_proto_addr = htonl(0);
+ memcpy(rarp->target_hw_addr, eth_src, ETH_ADDR_LEN);
+ rarp->target_proto_addr = htonl(0);
}
/* Insert VLAN header according to given TCI. Packet passed must be Ethernet
return NULL;
}
+void
+eth_format_masked(const uint8_t eth[ETH_ADDR_LEN],
+ const uint8_t mask[ETH_ADDR_LEN], 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));
+ }
+}
+
+void
+eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
+ const uint8_t mask[ETH_ADDR_LEN],
+ uint8_t dst[ETH_ADDR_LEN])
+{
+ int i;
+
+ for (i = 0; i < ETH_ADDR_LEN; i++) {
+ dst[i] = src[i] & mask[i];
+ }
+}
+
/* 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()). */
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.
- *
- * 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)
-{
- 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;
-}
-
static void
packet_set_ipv4_addr(struct ofpbuf *packet, ovs_be32 *addr, ovs_be32 new_addr)
{
uint8_t
packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow)
{
- /* XXX IPv6? */
- if (flow->dl_type == htons(ETH_TYPE_IP) && packet->l4
- && flow->nw_proto == IPPROTO_TCP && packet->l7) {
+ 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;
}
}
+
+/* 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
+ * format used by tcpdump. */
+void
+packet_format_tcp_flags(struct ds *s, uint8_t tcp_flags)
+{
+ if (!tcp_flags) {
+ ds_put_cstr(s, "none");
+ return;
+ }
+
+ if (tcp_flags & TCP_SYN) {
+ ds_put_char(s, 'S');
+ }
+ if (tcp_flags & TCP_FIN) {
+ ds_put_char(s, 'F');
+ }
+ if (tcp_flags & TCP_PSH) {
+ ds_put_char(s, 'P');
+ }
+ if (tcp_flags & TCP_RST) {
+ ds_put_char(s, 'R');
+ }
+ if (tcp_flags & TCP_URG) {
+ ds_put_char(s, 'U');
+ }
+ if (tcp_flags & TCP_ACK) {
+ ds_put_char(s, '.');
+ }
+ if (tcp_flags & 0x40) {
+ ds_put_cstr(s, "[40]");
+ }
+ if (tcp_flags & 0x80) {
+ ds_put_cstr(s, "[80]");
+ }
+}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff