- 根目录:
- net
- rxrpc
- ar-input.c
#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/errqueue.h>
#include <linux/udp.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/icmp.h>
#include <linux/gfp.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include <net/ip.h>
#include <net/udp.h>
#include <net/net_namespace.h>
#include "ar-internal.h"
unsigned long rxrpc_ack_timeout = 1;
const char *rxrpc_pkts[] = {
"?00",
"DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
"?09", "?10", "?11", "?12", "?13", "?14", "?15"
};
int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
bool force, bool terminal)
{
struct rxrpc_skb_priv *sp;
struct rxrpc_sock *rx = call->socket;
struct sock *sk;
int skb_len, ret;
_enter(",,%d,%d", force, terminal);
ASSERT(!irqs_disabled());
sp = rxrpc_skb(skb);
ASSERTCMP(sp->call, ==, call);
if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
_debug("already terminated");
ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE);
skb->destructor = NULL;
sp->call = NULL;
rxrpc_put_call(call);
rxrpc_free_skb(skb);
return 0;
}
sk = &rx->sk;
if (!force) {
ret = sk_filter(sk, skb);
if (ret < 0)
goto out;
}
spin_lock_bh(&sk->sk_receive_queue.lock);
if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) &&
!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
call->socket->sk.sk_state != RXRPC_CLOSE) {
skb->destructor = rxrpc_packet_destructor;
skb->dev = NULL;
skb->sk = sk;
atomic_add(skb->truesize, &sk->sk_rmem_alloc);
if (terminal) {
_debug("<<<< TERMINAL MESSAGE >>>>");
set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
}
if (rx->interceptor) {
rx->interceptor(sk, call->user_call_ID, skb);
spin_unlock_bh(&sk->sk_receive_queue.lock);
} else {
skb_len = skb->len;
_net("post skb %p", skb);
__skb_queue_tail(&sk->sk_receive_queue, skb);
spin_unlock_bh(&sk->sk_receive_queue.lock);
if (!sock_flag(sk, SOCK_DEAD))
sk->sk_data_ready(sk, skb_len);
}
skb = NULL;
} else {
spin_unlock_bh(&sk->sk_receive_queue.lock);
}
ret = 0;
out:
if (skb) {
skb->destructor = NULL;
sp->call = NULL;
rxrpc_put_call(call);
rxrpc_free_skb(skb);
}
_leave(" = %d", ret);
return ret;
}
static int rxrpc_fast_process_data(struct rxrpc_call *call,
struct sk_buff *skb, u32 seq)
{
struct rxrpc_skb_priv *sp;
bool terminal;
int ret, ackbit, ack;
_enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq);
sp = rxrpc_skb(skb);
ASSERTCMP(sp->call, ==, NULL);
spin_lock(&call->lock);
if (call->state > RXRPC_CALL_COMPLETE)
goto discard;
ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post);
ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv);
ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten);
if (seq < call->rx_data_post) {
_debug("dup #%u [-%u]", seq, call->rx_data_post);
ack = RXRPC_ACK_DUPLICATE;
ret = -ENOBUFS;
goto discard_and_ack;
}
ackbit = seq - (call->rx_data_eaten + 1);
ASSERTCMP(ackbit, >=, 0);
if (__test_and_set_bit(ackbit, call->ackr_window)) {
_debug("dup oos #%u [%u,%u]",
seq, call->rx_data_eaten, call->rx_data_post);
ack = RXRPC_ACK_DUPLICATE;
goto discard_and_ack;
}
if (seq >= call->ackr_win_top) {
_debug("exceed #%u [%u]", seq, call->ackr_win_top);
__clear_bit(ackbit, call->ackr_window);
ack = RXRPC_ACK_EXCEEDS_WINDOW;
goto discard_and_ack;
}
if (seq == call->rx_data_expect) {
clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags);
call->rx_data_expect++;
} else if (seq > call->rx_data_expect) {
_debug("oos #%u [%u]", seq, call->rx_data_expect);
call->rx_data_expect = seq + 1;
if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) {
ack = RXRPC_ACK_OUT_OF_SEQUENCE;
goto enqueue_and_ack;
}
goto enqueue_packet;
}
if (seq != call->rx_data_post) {
_debug("ahead #%u [%u]", seq, call->rx_data_post);
goto enqueue_packet;
}
if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags))
goto protocol_error;
if (call->conn->security)
goto enqueue_packet;
sp->call = call;
rxrpc_get_call(call);
terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
!(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
ret = rxrpc_queue_rcv_skb(call, skb, false, terminal);
if (ret < 0) {
if (ret == -ENOMEM || ret == -ENOBUFS) {
__clear_bit(ackbit, call->ackr_window);
ack = RXRPC_ACK_NOSPACE;
goto discard_and_ack;
}
goto out;
}
skb = NULL;
_debug("post #%u", seq);
ASSERTCMP(call->rx_data_post, ==, seq);
call->rx_data_post++;
if (sp->hdr.flags & RXRPC_LAST_PACKET)
set_bit(RXRPC_CALL_RCVD_LAST, &call->flags);
if (call->rx_data_post == call->rx_first_oos) {
_debug("drain rx oos now");
read_lock(&call->state_lock);
if (call->state < RXRPC_CALL_COMPLETE &&
!test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events))
rxrpc_queue_call(call);
read_unlock(&call->state_lock);
}
spin_unlock(&call->lock);
atomic_inc(&call->ackr_not_idle);
rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false);
_leave(" = 0 [posted]");
return 0;
protocol_error:
ret = -EBADMSG;
out:
spin_unlock(&call->lock);
_leave(" = %d", ret);
return ret;
discard_and_ack:
_debug("discard and ACK packet %p", skb);
__rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
discard:
spin_unlock(&call->lock);
rxrpc_free_skb(skb);
_leave(" = 0 [discarded]");
return 0;
enqueue_and_ack:
__rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
enqueue_packet:
_net("defer skb %p", skb);
spin_unlock(&call->lock);
skb_queue_tail(&call->rx_queue, skb);
atomic_inc(&call->ackr_not_idle);
read_lock(&call->state_lock);
if (call->state < RXRPC_CALL_DEAD)
rxrpc_queue_call(call);
read_unlock(&call->state_lock);
_leave(" = 0 [queued]");
return 0;
}
static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial)
{
write_lock_bh(&call->state_lock);
switch (call->state) {
case RXRPC_CALL_CLIENT_AWAIT_REPLY:
call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
call->acks_latest = serial;
_debug("implicit ACKALL %%%u", call->acks_latest);
set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events);
write_unlock_bh(&call->state_lock);
if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
clear_bit(RXRPC_CALL_RESEND, &call->events);
clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
}
break;
default:
write_unlock_bh(&call->state_lock);
break;
}
}
void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
__be32 _abort_code;
u32 serial, hi_serial, seq, abort_code;
_enter("%p,%p", call, skb);
ASSERT(!irqs_disabled());
#if 0
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
static int skip = 0;
if (++skip == 3) {
printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
skip = 0;
goto free_packet;
}
}
#endif
serial = ntohl(sp->hdr.serial);
hi_serial = atomic_read(&call->conn->hi_serial);
while (serial > hi_serial)
hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
serial);
if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
_proto("ACK Requested on %%%u", serial);
rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial,
!(sp->hdr.flags & RXRPC_MORE_PACKETS));
}
switch (sp->hdr.type) {
case RXRPC_PACKET_TYPE_ABORT:
_debug("abort");
if (skb_copy_bits(skb, 0, &_abort_code,
sizeof(_abort_code)) < 0)
goto protocol_error;
abort_code = ntohl(_abort_code);
_proto("Rx ABORT %%%u { %x }", serial, abort_code);
write_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_COMPLETE) {
call->state = RXRPC_CALL_REMOTELY_ABORTED;
call->abort_code = abort_code;
set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
rxrpc_queue_call(call);
}
goto free_packet_unlock;
case RXRPC_PACKET_TYPE_BUSY:
_proto("Rx BUSY %%%u", serial);
if (call->conn->out_clientflag)
goto protocol_error;
write_lock_bh(&call->state_lock);
switch (call->state) {
case RXRPC_CALL_CLIENT_SEND_REQUEST:
call->state = RXRPC_CALL_SERVER_BUSY;
set_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
rxrpc_queue_call(call);
case RXRPC_CALL_SERVER_BUSY:
goto free_packet_unlock;
default:
goto protocol_error_locked;
}
default:
_proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial);
goto protocol_error;
case RXRPC_PACKET_TYPE_DATA:
seq = ntohl(sp->hdr.seq);
_proto("Rx DATA %%%u { #%u }", serial, seq);
if (seq == 0)
goto protocol_error;
call->ackr_prev_seq = sp->hdr.seq;
if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
rxrpc_assume_implicit_ackall(call, serial);
switch (rxrpc_fast_process_data(call, skb, seq)) {
case 0:
skb = NULL;
goto done;
default:
BUG();
case -EBADMSG:
goto protocol_error;
}
case RXRPC_PACKET_TYPE_ACKALL:
case RXRPC_PACKET_TYPE_ACK:
read_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_DEAD) {
skb_queue_tail(&call->rx_queue, skb);
rxrpc_queue_call(call);
skb = NULL;
}
read_unlock_bh(&call->state_lock);
goto free_packet;
}
protocol_error:
_debug("protocol error");
write_lock_bh(&call->state_lock);
protocol_error_locked:
if (call->state <= RXRPC_CALL_COMPLETE) {
call->state = RXRPC_CALL_LOCALLY_ABORTED;
call->abort_code = RX_PROTOCOL_ERROR;
set_bit(RXRPC_CALL_ABORT, &call->events);
rxrpc_queue_call(call);
}
free_packet_unlock:
write_unlock_bh(&call->state_lock);
free_packet:
rxrpc_free_skb(skb);
done:
_leave("");
}
static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
struct sk_buff *jumbo)
{
struct rxrpc_jumbo_header jhdr;
struct rxrpc_skb_priv *sp;
struct sk_buff *part;
_enter(",{%u,%u}", jumbo->data_len, jumbo->len);
sp = rxrpc_skb(jumbo);
do {
sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
part = skb_clone(jumbo, GFP_ATOMIC);
if (!part) {
pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
break;
}
rxrpc_new_skb(part);
pskb_trim(part, RXRPC_JUMBO_DATALEN);
if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
goto protocol_error;
if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
goto protocol_error;
if (!pskb_pull(jumbo, sizeof(jhdr)))
BUG();
sp->hdr.seq = htonl(ntohl(sp->hdr.seq) + 1);
sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1);
sp->hdr.flags = jhdr.flags;
sp->hdr._rsvd = jhdr._rsvd;
_proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1);
rxrpc_fast_process_packet(call, part);
part = NULL;
} while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
rxrpc_fast_process_packet(call, jumbo);
_leave("");
return;
protocol_error:
_debug("protocol error");
rxrpc_free_skb(part);
rxrpc_free_skb(jumbo);
write_lock_bh(&call->state_lock);
if (call->state <= RXRPC_CALL_COMPLETE) {
call->state = RXRPC_CALL_LOCALLY_ABORTED;
call->abort_code = RX_PROTOCOL_ERROR;
set_bit(RXRPC_CALL_ABORT, &call->events);
rxrpc_queue_call(call);
}
write_unlock_bh(&call->state_lock);
_leave("");
}
static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn,
struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp;
struct rxrpc_call *call;
struct rb_node *p;
__be32 call_id;
_enter("%p,%p", conn, skb);
read_lock_bh(&conn->lock);
sp = rxrpc_skb(skb);
call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK];
if (!call || call->call_id != sp->hdr.callNumber)
goto call_not_extant;
_debug("extant call [%d]", call->state);
ASSERTCMP(call->conn, ==, conn);
read_lock(&call->state_lock);
switch (call->state) {
case RXRPC_CALL_LOCALLY_ABORTED:
if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
rxrpc_queue_call(call);
case RXRPC_CALL_REMOTELY_ABORTED:
case RXRPC_CALL_NETWORK_ERROR:
case RXRPC_CALL_DEAD:
goto free_unlock;
default:
break;
}
read_unlock(&call->state_lock);
rxrpc_get_call(call);
read_unlock_bh(&conn->lock);
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
sp->hdr.flags & RXRPC_JUMBO_PACKET)
rxrpc_process_jumbo_packet(call, skb);
else
rxrpc_fast_process_packet(call, skb);
rxrpc_put_call(call);
goto done;
call_not_extant:
_debug("call not extant");
call_id = sp->hdr.callNumber;
p = conn->calls.rb_node;
while (p) {
call = rb_entry(p, struct rxrpc_call, conn_node);
if (call_id < call->call_id)
p = p->rb_left;
else if (call_id > call->call_id)
p = p->rb_right;
else
goto found_completed_call;
}
dead_call:
read_unlock_bh(&conn->lock);
if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
sp->hdr.seq == cpu_to_be32(1)) {
_debug("incoming call");
skb_queue_tail(&conn->trans->local->accept_queue, skb);
rxrpc_queue_work(&conn->trans->local->acceptor);
goto done;
}
_debug("dead call");
skb->priority = RX_CALL_DEAD;
rxrpc_reject_packet(conn->trans->local, skb);
goto done;
found_completed_call:
_debug("completed call");
if (atomic_read(&call->usage) == 0)
goto dead_call;
read_lock(&call->state_lock);
ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK,
call->state, >=, RXRPC_CALL_COMPLETE);
if (call->state == RXRPC_CALL_LOCALLY_ABORTED ||
call->state == RXRPC_CALL_REMOTELY_ABORTED ||
call->state == RXRPC_CALL_DEAD) {
read_unlock(&call->state_lock);
goto dead_call;
}
if (call->conn->in_clientflag) {
read_unlock(&call->state_lock);
goto dead_call;
}
_debug("final ack again");
rxrpc_get_call(call);
set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
rxrpc_queue_call(call);
free_unlock:
read_unlock(&call->state_lock);
read_unlock_bh(&conn->lock);
rxrpc_free_skb(skb);
done:
_leave("");
}
static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
struct sk_buff *skb)
{
_enter("%p,%p", conn, skb);
atomic_inc(&conn->usage);
skb_queue_tail(&conn->rx_queue, skb);
rxrpc_queue_conn(conn);
}
void rxrpc_data_ready(struct sock *sk, int count)
{
struct rxrpc_connection *conn;
struct rxrpc_transport *trans;
struct rxrpc_skb_priv *sp;
struct rxrpc_local *local;
struct rxrpc_peer *peer;
struct sk_buff *skb;
int ret;
_enter("%p, %d", sk, count);
ASSERT(!irqs_disabled());
read_lock_bh(&rxrpc_local_lock);
local = sk->sk_user_data;
if (local && atomic_read(&local->usage) > 0)
rxrpc_get_local(local);
else
local = NULL;
read_unlock_bh(&rxrpc_local_lock);
if (!local) {
_leave(" [local dead]");
return;
}
skb = skb_recv_datagram(sk, 0, 1, &ret);
if (!skb) {
rxrpc_put_local(local);
if (ret == -EAGAIN)
return;
_debug("UDP socket error %d", ret);
return;
}
rxrpc_new_skb(skb);
_net("recv skb %p", skb);
if (skb_checksum_complete(skb)) {
rxrpc_free_skb(skb);
rxrpc_put_local(local);
UDP_INC_STATS_BH(&init_net, UDP_MIB_INERRORS, 0);
_leave(" [CSUM failed]");
return;
}
UDP_INC_STATS_BH(&init_net, UDP_MIB_INDATAGRAMS, 0);
skb_orphan(skb);
sp = rxrpc_skb(skb);
memset(sp, 0, sizeof(*sp));
_net("Rx UDP packet from %08x:%04hu",
ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr,
sizeof(sp->hdr)) < 0)
goto bad_message;
if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr)))
BUG();
_net("Rx RxRPC %s ep=%x call=%x:%x",
sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
ntohl(sp->hdr.epoch),
ntohl(sp->hdr.cid),
ntohl(sp->hdr.callNumber));
if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) {
_proto("Rx Bad Packet Type %u", sp->hdr.type);
goto bad_message;
}
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
(sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
goto bad_message;
peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source);
if (IS_ERR(peer))
goto cant_route_call;
trans = rxrpc_find_transport(local, peer);
rxrpc_put_peer(peer);
if (!trans)
goto cant_route_call;
conn = rxrpc_find_connection(trans, &sp->hdr);
rxrpc_put_transport(trans);
if (!conn)
goto cant_route_call;
_debug("CONN %p {%d}", conn, conn->debug_id);
if (sp->hdr.callNumber == 0)
rxrpc_post_packet_to_conn(conn, skb);
else
rxrpc_post_packet_to_call(conn, skb);
rxrpc_put_connection(conn);
rxrpc_put_local(local);
return;
cant_route_call:
_debug("can't route call");
if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
if (sp->hdr.seq == cpu_to_be32(1)) {
_debug("first packet");
skb_queue_tail(&local->accept_queue, skb);
rxrpc_queue_work(&local->acceptor);
rxrpc_put_local(local);
_leave(" [incoming]");
return;
}
skb->priority = RX_INVALID_OPERATION;
} else {
skb->priority = RX_CALL_DEAD;
}
_debug("reject");
rxrpc_reject_packet(local, skb);
rxrpc_put_local(local);
_leave(" [no call]");
return;
bad_message:
skb->priority = RX_PROTOCOL_ERROR;
rxrpc_reject_packet(local, skb);
rxrpc_put_local(local);
_leave(" [badmsg]");
}
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