-/* SCTP kernel reference Implementation
+/* SCTP kernel implementation
* (C) Copyright IBM Corp. 2001, 2004
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
*
- * This file is part of the SCTP kernel reference Implementation
+ * This file is part of the SCTP kernel implementation
*
* These functions handle output processing.
*
- * The SCTP reference implementation is free software;
+ * This SCTP implementation is free software;
* you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
- * The SCTP reference implementation is distributed in the hope that it
+ * This SCTP implementation is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* ************************
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/init.h>
+#include <linux/slab.h>
#include <net/inet_ecn.h>
+#include <net/ip.h>
#include <net/icmp.h>
-
-#ifndef TEST_FRAME
-#include <net/tcp.h>
-#endif /* TEST_FRAME (not defined) */
+#include <net/net_namespace.h>
#include <linux/socket.h> /* for sa_family_t */
#include <net/sock.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>
+#include <net/sctp/checksum.h>
/* Forward declarations for private helpers. */
-static sctp_xmit_t sctp_packet_append_data(struct sctp_packet *packet,
+static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet,
+ struct sctp_chunk *chunk);
+static void sctp_packet_append_data(struct sctp_packet *packet,
struct sctp_chunk *chunk);
+static sctp_xmit_t sctp_packet_will_fit(struct sctp_packet *packet,
+ struct sctp_chunk *chunk,
+ u16 chunk_len);
+
+static void sctp_packet_reset(struct sctp_packet *packet)
+{
+ packet->size = packet->overhead;
+ packet->has_cookie_echo = 0;
+ packet->has_sack = 0;
+ packet->has_data = 0;
+ packet->has_auth = 0;
+ packet->ipfragok = 0;
+ packet->auth = NULL;
+}
/* Config a packet.
* This appears to be a followup set of initializations.
{
struct sctp_chunk *chunk = NULL;
- SCTP_DEBUG_PRINTK("%s: packet:%p vtag:0x%x\n", __FUNCTION__,
+ SCTP_DEBUG_PRINTK("%s: packet:%p vtag:0x%x\n", __func__,
packet, vtag);
+ sctp_packet_reset(packet);
packet->vtag = vtag;
- packet->has_cookie_echo = 0;
- packet->has_sack = 0;
- packet->ipfragok = 0;
if (ecn_capable && sctp_packet_empty(packet)) {
chunk = sctp_get_ecne_prepend(packet->transport->asoc);
struct sctp_association *asoc = transport->asoc;
size_t overhead;
- SCTP_DEBUG_PRINTK("%s: packet:%p transport:%p\n", __FUNCTION__,
+ SCTP_DEBUG_PRINTK("%s: packet:%p transport:%p\n", __func__,
packet, transport);
packet->transport = transport;
}
overhead += sizeof(struct sctphdr);
packet->overhead = overhead;
- packet->size = overhead;
+ sctp_packet_reset(packet);
packet->vtag = 0;
- packet->has_cookie_echo = 0;
- packet->has_sack = 0;
- packet->ipfragok = 0;
packet->malloced = 0;
return packet;
}
{
struct sctp_chunk *chunk, *tmp;
- SCTP_DEBUG_PRINTK("%s: packet:%p\n", __FUNCTION__, packet);
+ SCTP_DEBUG_PRINTK("%s: packet:%p\n", __func__, packet);
list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {
list_del_init(&chunk->list);
* packet can be sent only after receiving the COOKIE_ACK.
*/
sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *packet,
- struct sctp_chunk *chunk)
+ struct sctp_chunk *chunk,
+ int one_packet)
{
sctp_xmit_t retval;
int error = 0;
- SCTP_DEBUG_PRINTK("%s: packet:%p chunk:%p\n", __FUNCTION__,
+ SCTP_DEBUG_PRINTK("%s: packet:%p chunk:%p\n", __func__,
packet, chunk);
switch ((retval = (sctp_packet_append_chunk(packet, chunk)))) {
/* If we have an empty packet, then we can NOT ever
* return PMTU_FULL.
*/
- retval = sctp_packet_append_chunk(packet, chunk);
+ if (!one_packet)
+ retval = sctp_packet_append_chunk(packet,
+ chunk);
}
break;
return retval;
}
+/* Try to bundle an auth chunk into the packet. */
+static sctp_xmit_t sctp_packet_bundle_auth(struct sctp_packet *pkt,
+ struct sctp_chunk *chunk)
+{
+ struct sctp_association *asoc = pkt->transport->asoc;
+ struct sctp_chunk *auth;
+ sctp_xmit_t retval = SCTP_XMIT_OK;
+
+ /* if we don't have an association, we can't do authentication */
+ if (!asoc)
+ return retval;
+
+ /* See if this is an auth chunk we are bundling or if
+ * auth is already bundled.
+ */
+ if (chunk->chunk_hdr->type == SCTP_CID_AUTH || pkt->has_auth)
+ return retval;
+
+ /* if the peer did not request this chunk to be authenticated,
+ * don't do it
+ */
+ if (!chunk->auth)
+ return retval;
+
+ auth = sctp_make_auth(asoc);
+ if (!auth)
+ return retval;
+
+ retval = sctp_packet_append_chunk(pkt, auth);
+
+ return retval;
+}
+
/* Try to bundle a SACK with the packet. */
static sctp_xmit_t sctp_packet_bundle_sack(struct sctp_packet *pkt,
struct sctp_chunk *chunk)
if (sctp_chunk_is_data(chunk) && !pkt->has_sack &&
!pkt->has_cookie_echo) {
struct sctp_association *asoc;
+ struct timer_list *timer;
asoc = pkt->transport->asoc;
+ timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK];
- if (asoc->a_rwnd > asoc->rwnd) {
+ /* If the SACK timer is running, we have a pending SACK */
+ if (timer_pending(timer)) {
struct sctp_chunk *sack;
asoc->a_rwnd = asoc->rwnd;
sack = sctp_make_sack(asoc);
if (sack) {
- struct timer_list *timer;
retval = sctp_packet_append_chunk(pkt, sack);
asoc->peer.sack_needed = 0;
- timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK];
- if (timer_pending(timer) && del_timer(timer))
+ if (del_timer(timer))
sctp_association_put(asoc);
}
}
{
sctp_xmit_t retval = SCTP_XMIT_OK;
__u16 chunk_len = WORD_ROUND(ntohs(chunk->chunk_hdr->length));
- size_t psize;
- size_t pmtu;
- int too_big;
- SCTP_DEBUG_PRINTK("%s: packet:%p chunk:%p\n", __FUNCTION__, packet,
+ SCTP_DEBUG_PRINTK("%s: packet:%p chunk:%p\n", __func__, packet,
chunk);
- retval = sctp_packet_bundle_sack(packet, chunk);
- psize = packet->size;
+ /* Data chunks are special. Before seeing what else we can
+ * bundle into this packet, check to see if we are allowed to
+ * send this DATA.
+ */
+ if (sctp_chunk_is_data(chunk)) {
+ retval = sctp_packet_can_append_data(packet, chunk);
+ if (retval != SCTP_XMIT_OK)
+ goto finish;
+ }
+ /* Try to bundle AUTH chunk */
+ retval = sctp_packet_bundle_auth(packet, chunk);
if (retval != SCTP_XMIT_OK)
goto finish;
- pmtu = ((packet->transport->asoc) ?
- (packet->transport->asoc->pathmtu) :
- (packet->transport->pathmtu));
-
- too_big = (psize + chunk_len > pmtu);
-
- /* Decide if we need to fragment or resubmit later. */
- if (too_big) {
- /* Both control chunks and data chunks with TSNs are
- * non-fragmentable.
- */
- if (sctp_packet_empty(packet) || !sctp_chunk_is_data(chunk)) {
- /* We no longer do re-fragmentation.
- * Just fragment at the IP layer, if we
- * actually hit this condition
- */
- packet->ipfragok = 1;
- goto append;
-
- } else {
- retval = SCTP_XMIT_PMTU_FULL;
- goto finish;
- }
- }
+ /* Try to bundle SACK chunk */
+ retval = sctp_packet_bundle_sack(packet, chunk);
+ if (retval != SCTP_XMIT_OK)
+ goto finish;
-append:
- /* We believe that this chunk is OK to add to the packet (as
- * long as we have the cwnd for it).
- */
+ /* Check to see if this chunk will fit into the packet */
+ retval = sctp_packet_will_fit(packet, chunk, chunk_len);
+ if (retval != SCTP_XMIT_OK)
+ goto finish;
- /* DATA is a special case since we must examine both rwnd and cwnd
- * before we send DATA.
- */
- if (sctp_chunk_is_data(chunk)) {
- retval = sctp_packet_append_data(packet, chunk);
+ /* We believe that this chunk is OK to add to the packet */
+ switch (chunk->chunk_hdr->type) {
+ case SCTP_CID_DATA:
+ /* Account for the data being in the packet */
+ sctp_packet_append_data(packet, chunk);
/* Disallow SACK bundling after DATA. */
packet->has_sack = 1;
- if (SCTP_XMIT_OK != retval)
- goto finish;
- } else if (SCTP_CID_COOKIE_ECHO == chunk->chunk_hdr->type)
+ /* Disallow AUTH bundling after DATA */
+ packet->has_auth = 1;
+ /* Let it be knows that packet has DATA in it */
+ packet->has_data = 1;
+ /* timestamp the chunk for rtx purposes */
+ chunk->sent_at = jiffies;
+ break;
+ case SCTP_CID_COOKIE_ECHO:
packet->has_cookie_echo = 1;
- else if (SCTP_CID_SACK == chunk->chunk_hdr->type)
+ break;
+
+ case SCTP_CID_SACK:
packet->has_sack = 1;
+ break;
+
+ case SCTP_CID_AUTH:
+ packet->has_auth = 1;
+ packet->auth = chunk;
+ break;
+ }
/* It is OK to send this chunk. */
list_add_tail(&chunk->list, &packet->chunk_list);
struct sctp_transport *tp = packet->transport;
struct sctp_association *asoc = tp->asoc;
struct sctphdr *sh;
- __u32 crc32 = 0;
struct sk_buff *nskb;
struct sctp_chunk *chunk, *tmp;
struct sock *sk;
int padding; /* How much padding do we need? */
__u8 has_data = 0;
struct dst_entry *dst = tp->dst;
+ unsigned char *auth = NULL; /* pointer to auth in skb data */
+ __u32 cksum_buf_len = sizeof(struct sctphdr);
- SCTP_DEBUG_PRINTK("%s: packet:%p\n", __FUNCTION__, packet);
+ SCTP_DEBUG_PRINTK("%s: packet:%p\n", __func__, packet);
/* Do NOT generate a chunkless packet. */
if (list_empty(&packet->chunk_list))
sctp_assoc_sync_pmtu(asoc);
}
}
- nskb->dst = dst_clone(tp->dst);
- if (!nskb->dst)
+ dst = dst_clone(tp->dst);
+ skb_dst_set(nskb, dst);
+ if (!dst)
goto no_route;
- dst = nskb->dst;
/* Build the SCTP header. */
sh = (struct sctphdr *)skb_push(nskb, sizeof(struct sctphdr));
+ skb_reset_transport_header(nskb);
sh->source = htons(packet->source_port);
sh->dest = htons(packet->destination_port);
sh->vtag = htonl(packet->vtag);
sh->checksum = 0;
- /* 2) Calculate the Adler-32 checksum of the whole packet,
- * including the SCTP common header and all the
- * chunks.
- *
- * Note: Adler-32 is no longer applicable, as has been replaced
- * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
- */
- if (!(dst->dev->features & NETIF_F_NO_CSUM))
- crc32 = sctp_start_cksum((__u8 *)sh, sizeof(struct sctphdr));
-
/**
* 6.10 Bundling
*
list_for_each_entry_safe(chunk, tmp, &packet->chunk_list, list) {
list_del_init(&chunk->list);
if (sctp_chunk_is_data(chunk)) {
-
- if (!chunk->has_tsn) {
- sctp_chunk_assign_ssn(chunk);
- sctp_chunk_assign_tsn(chunk);
-
/* 6.3.1 C4) When data is in flight and when allowed
* by rule C5, a new RTT measurement MUST be made each
* round trip. Furthermore, new RTT measurements
* for a given destination transport address.
*/
- if (!tp->rto_pending) {
- chunk->rtt_in_progress = 1;
- tp->rto_pending = 1;
- }
- } else
- chunk->resent = 1;
-
- chunk->sent_at = jiffies;
+ if (!tp->rto_pending) {
+ chunk->rtt_in_progress = 1;
+ tp->rto_pending = 1;
+ }
has_data = 1;
}
if (padding)
memset(skb_put(chunk->skb, padding), 0, padding);
- if (dst->dev->features & NETIF_F_NO_CSUM)
- memcpy(skb_put(nskb, chunk->skb->len),
+ /* if this is the auth chunk that we are adding,
+ * store pointer where it will be added and put
+ * the auth into the packet.
+ */
+ if (chunk == packet->auth)
+ auth = skb_tail_pointer(nskb);
+
+ cksum_buf_len += chunk->skb->len;
+ memcpy(skb_put(nskb, chunk->skb->len),
chunk->skb->data, chunk->skb->len);
- else
- crc32 = sctp_update_copy_cksum(skb_put(nskb,
- chunk->skb->len),
- chunk->skb->data,
- chunk->skb->len, crc32);
SCTP_DEBUG_PRINTK("%s %p[%s] %s 0x%x, %s %d, %s %d, %s %d\n",
"*** Chunk", chunk,
sctp_chunk_free(chunk);
}
- /* Perform final transformation on checksum. */
- if (!(dst->dev->features & NETIF_F_NO_CSUM))
- crc32 = sctp_end_cksum(crc32);
+ /* SCTP-AUTH, Section 6.2
+ * The sender MUST calculate the MAC as described in RFC2104 [2]
+ * using the hash function H as described by the MAC Identifier and
+ * the shared association key K based on the endpoint pair shared key
+ * described by the shared key identifier. The 'data' used for the
+ * computation of the AUTH-chunk is given by the AUTH chunk with its
+ * HMAC field set to zero (as shown in Figure 6) followed by all
+ * chunks that are placed after the AUTH chunk in the SCTP packet.
+ */
+ if (auth)
+ sctp_auth_calculate_hmac(asoc, nskb,
+ (struct sctp_auth_chunk *)auth,
+ GFP_ATOMIC);
- /* 3) Put the resultant value into the checksum field in the
- * common header, and leave the rest of the bits unchanged.
+ /* 2) Calculate the Adler-32 checksum of the whole packet,
+ * including the SCTP common header and all the
+ * chunks.
+ *
+ * Note: Adler-32 is no longer applicable, as has been replaced
+ * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
*/
- sh->checksum = htonl(crc32);
+ if (!sctp_checksum_disable &&
+ !(dst->dev->features & (NETIF_F_NO_CSUM | NETIF_F_SCTP_CSUM))) {
+ __u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);
+
+ /* 3) Put the resultant value into the checksum field in the
+ * common header, and leave the rest of the bits unchanged.
+ */
+ sh->checksum = sctp_end_cksum(crc32);
+ } else {
+ if (dst->dev->features & NETIF_F_SCTP_CSUM) {
+ /* no need to seed psuedo checksum for SCTP */
+ nskb->ip_summed = CHECKSUM_PARTIAL;
+ nskb->csum_start = (skb_transport_header(nskb) -
+ nskb->head);
+ nskb->csum_offset = offsetof(struct sctphdr, checksum);
+ } else {
+ nskb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
/* IP layer ECN support
* From RFC 2481
* Note: The works for IPv6 layer checks this bit too later
* in transmission. See IP6_ECN_flow_xmit().
*/
- INET_ECN_xmit(nskb->sk);
+ (*tp->af_specific->ecn_capable)(nskb->sk);
/* Set up the IP options. */
/* BUG: not implemented
struct timer_list *timer;
unsigned long timeout;
- tp->last_time_used = jiffies;
-
/* Restart the AUTOCLOSE timer when sending data. */
if (sctp_state(asoc, ESTABLISHED) && asoc->autoclose) {
timer = &asoc->timers[SCTP_EVENT_TIMEOUT_AUTOCLOSE];
SCTP_DEBUG_PRINTK("***sctp_transmit_packet*** skb len %d\n",
nskb->len);
- if (tp->param_flags & SPP_PMTUD_ENABLE)
- (*tp->af_specific->sctp_xmit)(nskb, tp, packet->ipfragok);
- else
- (*tp->af_specific->sctp_xmit)(nskb, tp, 1);
+ nskb->local_df = packet->ipfragok;
+ (*tp->af_specific->sctp_xmit)(nskb, tp);
out:
- packet->size = packet->overhead;
+ sctp_packet_reset(packet);
return err;
no_route:
kfree_skb(nskb);
- IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
+ IP_INC_STATS_BH(&init_net, IPSTATS_MIB_OUTNOROUTES);
/* FIXME: Returning the 'err' will effect all the associations
* associated with a socket, although only one of the paths of the
* 2nd Level Abstractions
********************************************************************/
-/* This private function handles the specifics of appending DATA chunks. */
-static sctp_xmit_t sctp_packet_append_data(struct sctp_packet *packet,
+/* This private function check to see if a chunk can be added */
+static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet,
struct sctp_chunk *chunk)
{
sctp_xmit_t retval = SCTP_XMIT_OK;
- size_t datasize, rwnd, inflight;
+ size_t datasize, rwnd, inflight, flight_size;
struct sctp_transport *transport = packet->transport;
- __u32 max_burst_bytes;
struct sctp_association *asoc = transport->asoc;
- struct sctp_sock *sp = sctp_sk(asoc->base.sk);
struct sctp_outq *q = &asoc->outqueue;
/* RFC 2960 6.1 Transmission of DATA Chunks
*/
rwnd = asoc->peer.rwnd;
- inflight = asoc->outqueue.outstanding_bytes;
+ inflight = q->outstanding_bytes;
+ flight_size = transport->flight_size;
datasize = sctp_data_size(chunk);
}
}
- /* sctpimpguide-05 2.14.2
- * D) When the time comes for the sender to
- * transmit new DATA chunks, the protocol parameter Max.Burst MUST
- * first be applied to limit how many new DATA chunks may be sent.
- * The limit is applied by adjusting cwnd as follows:
- * if ((flightsize + Max.Burst * MTU) < cwnd)
- * cwnd = flightsize + Max.Burst * MTU
- */
- max_burst_bytes = asoc->max_burst * asoc->pathmtu;
- if ((transport->flight_size + max_burst_bytes) < transport->cwnd) {
- transport->cwnd = transport->flight_size + max_burst_bytes;
- SCTP_DEBUG_PRINTK("%s: cwnd limited by max_burst: "
- "transport: %p, cwnd: %d, "
- "ssthresh: %d, flight_size: %d, "
- "pba: %d\n",
- __FUNCTION__, transport,
- transport->cwnd,
- transport->ssthresh,
- transport->flight_size,
- transport->partial_bytes_acked);
- }
-
/* RFC 2960 6.1 Transmission of DATA Chunks
*
* B) At any given time, the sender MUST NOT transmit new data
* When a Fast Retransmit is being performed the sender SHOULD
* ignore the value of cwnd and SHOULD NOT delay retransmission.
*/
- if (chunk->fast_retransmit <= 0)
- if (transport->flight_size >= transport->cwnd) {
+ if (chunk->fast_retransmit != SCTP_NEED_FRTX)
+ if (flight_size >= transport->cwnd) {
retval = SCTP_XMIT_RWND_FULL;
goto finish;
}
* if any previously transmitted data on the connection remains
* unacknowledged.
*/
- if (!sp->nodelay && sctp_packet_empty(packet) &&
- q->outstanding_bytes && sctp_state(asoc, ESTABLISHED)) {
- unsigned len = datasize + q->out_qlen;
+ if (!sctp_sk(asoc->base.sk)->nodelay && sctp_packet_empty(packet) &&
+ inflight && sctp_state(asoc, ESTABLISHED)) {
+ unsigned max = transport->pathmtu - packet->overhead;
+ unsigned len = chunk->skb->len + q->out_qlen;
/* Check whether this chunk and all the rest of pending
* data will fit or delay in hopes of bundling a full
* sized packet.
+ * Don't delay large message writes that may have been
+ * fragmeneted into small peices.
*/
- if (len < asoc->frag_point) {
+ if ((len < max) && chunk->msg->can_delay) {
retval = SCTP_XMIT_NAGLE_DELAY;
goto finish;
}
}
+finish:
+ return retval;
+}
+
+/* This private function does management things when adding DATA chunk */
+static void sctp_packet_append_data(struct sctp_packet *packet,
+ struct sctp_chunk *chunk)
+{
+ struct sctp_transport *transport = packet->transport;
+ size_t datasize = sctp_data_size(chunk);
+ struct sctp_association *asoc = transport->asoc;
+ u32 rwnd = asoc->peer.rwnd;
+
/* Keep track of how many bytes are in flight over this transport. */
transport->flight_size += datasize;
/* Has been accepted for transmission. */
if (!asoc->peer.prsctp_capable)
chunk->msg->can_abandon = 0;
+ sctp_chunk_assign_tsn(chunk);
+ sctp_chunk_assign_ssn(chunk);
+}
+
+static sctp_xmit_t sctp_packet_will_fit(struct sctp_packet *packet,
+ struct sctp_chunk *chunk,
+ u16 chunk_len)
+{
+ size_t psize;
+ size_t pmtu;
+ int too_big;
+ sctp_xmit_t retval = SCTP_XMIT_OK;
+
+ psize = packet->size;
+ pmtu = ((packet->transport->asoc) ?
+ (packet->transport->asoc->pathmtu) :
+ (packet->transport->pathmtu));
+
+ too_big = (psize + chunk_len > pmtu);
+
+ /* Decide if we need to fragment or resubmit later. */
+ if (too_big) {
+ /* It's OK to fragmet at IP level if any one of the following
+ * is true:
+ * 1. The packet is empty (meaning this chunk is greater
+ * the MTU)
+ * 2. The chunk we are adding is a control chunk
+ * 3. The packet doesn't have any data in it yet and data
+ * requires authentication.
+ */
+ if (sctp_packet_empty(packet) || !sctp_chunk_is_data(chunk) ||
+ (!packet->has_data && chunk->auth)) {
+ /* We no longer do re-fragmentation.
+ * Just fragment at the IP layer, if we
+ * actually hit this condition
+ */
+ packet->ipfragok = 1;
+ } else {
+ retval = SCTP_XMIT_PMTU_FULL;
+ }
+ }
-finish:
return retval;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff