#include <linux/config.h>
#include <linux/dccp.h>
+#include <linux/kernel.h>
#include <linux/skbuff.h>
+#include <net/inet_sock.h>
#include <net/sock.h>
#include "ackvec.h"
inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
}
+static void dccp_skb_entail(struct sock *sk, struct sk_buff *skb)
+{
+ skb_set_owner_w(skb, sk);
+ WARN_ON(sk->sk_send_head);
+ sk->sk_send_head = skb;
+}
+
/*
* All SKB's seen here are completely headerless. It is our
* job to build the DCCP header, and pass the packet down to
* IP so it can do the same plus pass the packet off to the
* device.
*/
-int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
+static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
{
if (likely(skb != NULL)) {
const struct inet_sock *inet = inet_sk(sk);
+ const struct inet_connection_sock *icsk = inet_csk(sk);
struct dccp_sock *dp = dccp_sk(sk);
struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
struct dccp_hdr *dh;
/* XXX For now we're using only 48 bits sequence numbers */
- const int dccp_header_size = sizeof(*dh) +
+ const u32 dccp_header_size = sizeof(*dh) +
sizeof(struct dccp_hdr_ext) +
dccp_packet_hdr_len(dcb->dccpd_type);
int err, set_ack = 1;
switch (dcb->dccpd_type) {
case DCCP_PKT_DATA:
set_ack = 0;
+ /* fall through */
+ case DCCP_PKT_DATAACK:
break;
+
+ case DCCP_PKT_REQUEST:
+ set_ack = 0;
+ /* fall through */
+
case DCCP_PKT_SYNC:
case DCCP_PKT_SYNCACK:
ackno = dcb->dccpd_seq;
+ /* fall through */
+ default:
+ /*
+ * Only data packets should come through with skb->sk
+ * set.
+ */
+ WARN_ON(skb->sk);
+ skb_set_owner_w(skb, sk);
break;
}
dcb->dccpd_seq = dp->dccps_gss;
- dccp_insert_options(sk, skb);
+
+ if (dccp_insert_options(sk, skb)) {
+ kfree_skb(skb);
+ return -EPROTO;
+ }
skb->h.raw = skb_push(skb, dccp_header_size);
dh = dccp_hdr(skb);
- if (!skb->sk)
- skb_set_owner_w(skb, sk);
-
/* Build DCCP header and checksum it. */
memset(dh, 0, dccp_header_size);
dh->dccph_type = dcb->dccpd_type;
break;
}
- dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr,
- inet->daddr);
+ icsk->icsk_af_ops->send_check(sk, skb->len, skb);
if (set_ack)
dccp_event_ack_sent(sk);
DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
- err = ip_queue_xmit(skb, 0);
+ err = icsk->icsk_af_ops->queue_xmit(skb, 0);
if (err <= 0)
return err;
unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
{
+ struct inet_connection_sock *icsk = inet_csk(sk);
struct dccp_sock *dp = dccp_sk(sk);
- int mss_now;
-
- /*
- * FIXME: we really should be using the af_specific thing to support
- * IPv6.
- * mss_now = pmtu - tp->af_specific->net_header_len -
- * sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext);
- */
- mss_now = pmtu - sizeof(struct iphdr) - sizeof(struct dccp_hdr) -
- sizeof(struct dccp_hdr_ext);
+ int mss_now = (pmtu - icsk->icsk_af_ops->net_header_len -
+ sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext));
/* Now subtract optional transport overhead */
- mss_now -= dp->dccps_ext_header_len;
+ mss_now -= icsk->icsk_ext_hdr_len;
/*
* FIXME: this should come from the CCID infrastructure, where, say,
mss_now -= ((5 + 6 + 10 + 6 + 6 + 6 + 3) / 4) * 4;
/* And store cached results */
- dp->dccps_pmtu_cookie = pmtu;
+ icsk->icsk_pmtu_cookie = pmtu;
dp->dccps_mss_cache = mss_now;
return mss_now;
}
+EXPORT_SYMBOL_GPL(dccp_sync_mss);
+
void dccp_write_space(struct sock *sk)
{
read_lock(&sk->sk_callback_lock);
int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
{
- if (inet_sk_rebuild_header(sk) != 0)
+ if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk) != 0)
return -EHOSTUNREACH; /* Routing failure or similar. */
return dccp_transmit_skb(sk, (skb_cloned(skb) ?
{
struct dccp_hdr *dh;
struct dccp_request_sock *dreq;
- const int dccp_header_size = sizeof(struct dccp_hdr) +
+ const u32 dccp_header_size = sizeof(struct dccp_hdr) +
sizeof(struct dccp_hdr_ext) +
sizeof(struct dccp_hdr_response);
- struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN +
- dccp_header_size, 1,
+ struct sk_buff *skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1,
GFP_ATOMIC);
if (skb == NULL)
return NULL;
/* Reserve space for headers. */
- skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size);
+ skb_reserve(skb, sk->sk_prot->max_header);
skb->dst = dst_clone(dst);
skb->csum = 0;
dreq = dccp_rsk(req);
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
DCCP_SKB_CB(skb)->dccpd_seq = dreq->dreq_iss;
- dccp_insert_options(sk, skb);
+
+ if (dccp_insert_options(sk, skb)) {
+ kfree_skb(skb);
+ return NULL;
+ }
skb->h.raw = skb_push(skb, dccp_header_size);
dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dreq->dreq_isr);
dccp_hdr_response(skb)->dccph_resp_service = dreq->dreq_service;
- dh->dccph_checksum = dccp_v4_checksum(skb, inet_rsk(req)->loc_addr,
- inet_rsk(req)->rmt_addr);
-
DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
return skb;
}
-struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
- const enum dccp_reset_codes code)
+EXPORT_SYMBOL_GPL(dccp_make_response);
+
+static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
+ const enum dccp_reset_codes code)
{
struct dccp_hdr *dh;
struct dccp_sock *dp = dccp_sk(sk);
- const int dccp_header_size = sizeof(struct dccp_hdr) +
+ const u32 dccp_header_size = sizeof(struct dccp_hdr) +
sizeof(struct dccp_hdr_ext) +
sizeof(struct dccp_hdr_reset);
- struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN +
- dccp_header_size, 1,
+ struct sk_buff *skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1,
GFP_ATOMIC);
if (skb == NULL)
return NULL;
/* Reserve space for headers. */
- skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size);
+ skb_reserve(skb, sk->sk_prot->max_header);
skb->dst = dst_clone(dst);
skb->csum = 0;
DCCP_SKB_CB(skb)->dccpd_reset_code = code;
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET;
DCCP_SKB_CB(skb)->dccpd_seq = dp->dccps_gss;
- dccp_insert_options(sk, skb);
+
+ if (dccp_insert_options(sk, skb)) {
+ kfree_skb(skb);
+ return NULL;
+ }
skb->h.raw = skb_push(skb, dccp_header_size);
dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr);
dccp_hdr_reset(skb)->dccph_reset_code = code;
-
- dh->dccph_checksum = dccp_v4_checksum(skb, inet_sk(sk)->saddr,
- inet_sk(sk)->daddr);
+ inet_csk(sk)->icsk_af_ops->send_check(sk, skb->len, skb);
DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
return skb;
}
+int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code)
+{
+ /*
+ * FIXME: what if rebuild_header fails?
+ * Should we be doing a rebuild_header here?
+ */
+ int err = inet_sk_rebuild_header(sk);
+
+ if (err == 0) {
+ struct sk_buff *skb = dccp_make_reset(sk, sk->sk_dst_cache,
+ code);
+ if (skb != NULL) {
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, 0);
+ if (err == NET_XMIT_CN)
+ err = 0;
+ }
+ }
+
+ return err;
+}
+
/*
* Do all connect socket setups that can be done AF independent.
*/
static inline void dccp_connect_init(struct sock *sk)
{
+ struct dccp_sock *dp = dccp_sk(sk);
struct dst_entry *dst = __sk_dst_get(sk);
struct inet_connection_sock *icsk = inet_csk(sk);
dccp_sync_mss(sk, dst_mtu(dst));
- /*
- * FIXME: set dp->{dccps_swh,dccps_swl}, with
- * something like dccp_inc_seq
- */
+ dccp_update_gss(sk, dp->dccps_iss);
+ /*
+ * SWL and AWL are initially adjusted so that they are not less than
+ * the initial Sequence Numbers received and sent, respectively:
+ * SWL := max(GSR + 1 - floor(W/4), ISR),
+ * AWL := max(GSS - W' + 1, ISS).
+ * These adjustments MUST be applied only at the beginning of the
+ * connection.
+ */
+ dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
icsk->icsk_retransmits = 0;
}
dccp_connect_init(sk);
- skb = alloc_skb(MAX_DCCP_HEADER + 15, sk->sk_allocation);
+ skb = alloc_skb(sk->sk_prot->max_header, sk->sk_allocation);
if (unlikely(skb == NULL))
return -ENOBUFS;
/* Reserve space for headers. */
- skb_reserve(skb, MAX_DCCP_HEADER);
+ skb_reserve(skb, sk->sk_prot->max_header);
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST;
skb->csum = 0;
- skb_set_owner_w(skb, sk);
- BUG_TRAP(sk->sk_send_head == NULL);
- sk->sk_send_head = skb;
+ dccp_skb_entail(sk, skb);
dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL));
DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS);
return 0;
}
+EXPORT_SYMBOL_GPL(dccp_connect);
+
void dccp_send_ack(struct sock *sk)
{
/* If we have been reset, we may not send again. */
if (sk->sk_state != DCCP_CLOSED) {
- struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC);
+ struct sk_buff *skb = alloc_skb(sk->sk_prot->max_header,
+ GFP_ATOMIC);
if (skb == NULL) {
inet_csk_schedule_ack(sk);
}
/* Reserve space for headers */
- skb_reserve(skb, MAX_DCCP_HEADER);
+ skb_reserve(skb, sk->sk_prot->max_header);
skb->csum = 0;
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK;
- skb_set_owner_w(skb, sk);
dccp_transmit_skb(sk, skb);
}
}
* dccp_transmit_skb() will set the ownership to this
* sock.
*/
- struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC);
+ struct sk_buff *skb = alloc_skb(sk->sk_prot->max_header, GFP_ATOMIC);
if (skb == NULL)
/* FIXME: how to make sure the sync is sent? */
return;
/* Reserve space for headers and prepare control bits. */
- skb_reserve(skb, MAX_DCCP_HEADER);
+ skb_reserve(skb, sk->sk_prot->max_header);
skb->csum = 0;
DCCP_SKB_CB(skb)->dccpd_type = pkt_type;
DCCP_SKB_CB(skb)->dccpd_seq = seq;
- skb_set_owner_w(skb, sk);
dccp_transmit_skb(sk, skb);
}
+EXPORT_SYMBOL_GPL(dccp_send_sync);
+
/*
* Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This
* cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under
{
struct dccp_sock *dp = dccp_sk(sk);
struct sk_buff *skb;
- const unsigned int prio = active ? GFP_KERNEL : GFP_ATOMIC;
+ const gfp_t prio = active ? GFP_KERNEL : GFP_ATOMIC;
skb = alloc_skb(sk->sk_prot->max_header, prio);
if (skb == NULL)
DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ?
DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ;
- skb_set_owner_w(skb, sk);
if (active) {
- BUG_TRAP(sk->sk_send_head == NULL);
- sk->sk_send_head = skb;
+ dccp_skb_entail(sk, skb);
dccp_transmit_skb(sk, skb_clone(skb, prio));
} else
dccp_transmit_skb(sk, skb);
projects / linux-2.6-omap-h63xx.git / blobdiff