*/
#define rxrpc_skb_traces \
EM(rxrpc_skb_cleaned, "CLN") \
+ EM(rxrpc_skb_cloned_jumbo, "CLJ") \
EM(rxrpc_skb_freed, "FRE") \
EM(rxrpc_skb_got, "GOT") \
EM(rxrpc_skb_lost, "*L*") \
TRACE_EVENT(rxrpc_rx_data,
TP_PROTO(unsigned int call, rxrpc_seq_t seq,
- rxrpc_serial_t serial, u8 flags, u8 anno),
+ rxrpc_serial_t serial, u8 flags),
- TP_ARGS(call, seq, serial, flags, anno),
+ TP_ARGS(call, seq, serial, flags),
TP_STRUCT__entry(
__field(unsigned int, call )
__field(rxrpc_seq_t, seq )
__field(rxrpc_serial_t, serial )
__field(u8, flags )
- __field(u8, anno )
),
TP_fast_assign(
__entry->seq = seq;
__entry->serial = serial;
__entry->flags = flags;
- __entry->anno = anno;
),
- TP_printk("c=%08x DATA %08x q=%08x fl=%02x a=%02x",
+ TP_printk("c=%08x DATA %08x q=%08x fl=%02x",
__entry->call,
__entry->serial,
__entry->seq,
- __entry->flags,
- __entry->anno)
+ __entry->flags)
);
TRACE_EVENT(rxrpc_rx_ack,
* - max 48 bytes (struct sk_buff::cb)
*/
struct rxrpc_skb_priv {
- atomic_t nr_ring_pins; /* Number of rxtx ring pins */
- u8 nr_subpackets; /* Number of subpackets */
- u8 rx_flags; /* Received packet flags */
-#define RXRPC_SKB_INCL_LAST 0x01 /* - Includes last packet */
- union {
- int remain; /* amount of space remaining for next write */
-
- /* List of requested ACKs on subpackets */
- unsigned long rx_req_ack[(RXRPC_MAX_NR_JUMBO + BITS_PER_LONG - 1) /
- BITS_PER_LONG];
- };
-
- struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
+ u16 remain;
+ u16 offset; /* Offset of data */
+ u16 len; /* Length of data */
+ u8 rx_flags; /* Received packet flags */
+ u8 flags;
+#define RXRPC_RX_VERIFIED 0x01
+
+ struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
};
#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
int (*secure_packet)(struct rxrpc_call *, struct sk_buff *, size_t);
/* verify the security on a received packet */
- int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
- unsigned int, unsigned int, rxrpc_seq_t, u16);
+ int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
/* Free crypto request on a call */
void (*free_call_crypto)(struct rxrpc_call *);
- /* Locate the data in a received packet that has been verified. */
- void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
- unsigned int *, unsigned int *);
-
/* issue a challenge */
int (*issue_challenge)(struct rxrpc_connection *);
int debug_id; /* debug ID for printks */
unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
unsigned short rx_pkt_len; /* Current recvmsg packet len */
- bool rx_pkt_last; /* Current recvmsg packet is last */
/* Rx/Tx circular buffer, depending on phase.
*
#define RXRPC_TX_ANNO_LAST 0x04
#define RXRPC_TX_ANNO_RESENT 0x08
-#define RXRPC_RX_ANNO_SUBPACKET 0x3f /* Subpacket number in jumbogram */
-#define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */
rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but
* not hard-ACK'd packet follows this.
*/
rxrpc_serial_t rx_serial; /* Highest serial received for this call */
u8 rx_winsize; /* Size of Rx window */
u8 tx_winsize; /* Maximum size of Tx window */
- u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */
spinlock_t input_lock; /* Lock for packet input to this call */
}
/*
- * Scan a data packet to validate its structure and to work out how many
- * subpackets it contains.
- *
- * A jumbo packet is a collection of consecutive packets glued together with
- * little headers between that indicate how to change the initial header for
- * each subpacket.
- *
- * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but
- * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any
- * size.
+ * Process a DATA packet, adding the packet to the Rx ring. The caller's
+ * packet ref must be passed on or discarded.
*/
-static bool rxrpc_validate_data(struct sk_buff *skb)
+static void rxrpc_input_data_one(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- unsigned int offset = sizeof(struct rxrpc_wire_header);
- unsigned int len = skb->len;
- u8 flags = sp->hdr.flags;
+ rxrpc_serial_t serial = sp->hdr.serial;
+ rxrpc_seq_t seq = sp->hdr.seq, hard_ack;
+ unsigned int ix = seq & RXRPC_RXTX_BUFF_MASK;
+ bool last = sp->hdr.flags & RXRPC_LAST_PACKET;
+ bool acked = false;
- for (;;) {
- if (flags & RXRPC_REQUEST_ACK)
- __set_bit(sp->nr_subpackets, sp->rx_req_ack);
- sp->nr_subpackets++;
+ rxrpc_inc_stat(call->rxnet, stat_rx_data);
+ if (sp->hdr.flags & RXRPC_REQUEST_ACK)
+ rxrpc_inc_stat(call->rxnet, stat_rx_data_reqack);
+ if (sp->hdr.flags & RXRPC_JUMBO_PACKET)
+ rxrpc_inc_stat(call->rxnet, stat_rx_data_jumbo);
- if (!(flags & RXRPC_JUMBO_PACKET))
- break;
+ hard_ack = READ_ONCE(call->rx_hard_ack);
- if (len - offset < RXRPC_JUMBO_SUBPKTLEN)
- goto protocol_error;
- if (flags & RXRPC_LAST_PACKET)
- goto protocol_error;
- offset += RXRPC_JUMBO_DATALEN;
- if (skb_copy_bits(skb, offset, &flags, 1) < 0)
- goto protocol_error;
- offset += sizeof(struct rxrpc_jumbo_header);
+ _proto("Rx DATA %%%u { #%x l=%u }", serial, seq, last);
+
+ if (last) {
+ if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
+ seq != call->rx_top) {
+ rxrpc_proto_abort("LSN", call, seq);
+ goto out;
+ }
+ } else {
+ if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
+ after_eq(seq, call->rx_top)) {
+ rxrpc_proto_abort("LSA", call, seq);
+ goto out;
+ }
}
- if (flags & RXRPC_LAST_PACKET)
- sp->rx_flags |= RXRPC_SKB_INCL_LAST;
- return true;
+ trace_rxrpc_rx_data(call->debug_id, seq, serial, sp->hdr.flags);
-protocol_error:
- return false;
+ if (before_eq(seq, hard_ack)) {
+ rxrpc_send_ACK(call, RXRPC_ACK_DUPLICATE, serial,
+ rxrpc_propose_ack_input_data);
+ goto out;
+ }
+
+ if (call->rxtx_buffer[ix]) {
+ rxrpc_send_ACK(call, RXRPC_ACK_DUPLICATE, serial,
+ rxrpc_propose_ack_input_data);
+ goto out;
+ }
+
+ if (after(seq, hard_ack + call->rx_winsize)) {
+ rxrpc_send_ACK(call, RXRPC_ACK_EXCEEDS_WINDOW, serial,
+ rxrpc_propose_ack_input_data);
+ goto out;
+ }
+
+ if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
+ rxrpc_send_ACK(call, RXRPC_ACK_REQUESTED, serial,
+ rxrpc_propose_ack_input_data);
+ acked = true;
+ }
+
+ if (after(seq, call->ackr_highest_seq))
+ call->ackr_highest_seq = seq;
+
+ /* Queue the packet. We use a couple of memory barriers here as need
+ * to make sure that rx_top is perceived to be set after the buffer
+ * pointer and that the buffer pointer is set after the annotation and
+ * the skb data.
+ *
+ * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window()
+ * and also rxrpc_fill_out_ack().
+ */
+ call->rxtx_annotations[ix] = 1;
+ smp_wmb();
+ call->rxtx_buffer[ix] = skb;
+ if (after(seq, call->rx_top)) {
+ smp_store_release(&call->rx_top, seq);
+ } else if (before(seq, call->rx_top)) {
+ /* Send an immediate ACK if we fill in a hole */
+ if (!acked) {
+ rxrpc_send_ACK(call, RXRPC_ACK_DELAY, serial,
+ rxrpc_propose_ack_input_data_hole);
+ acked = true;
+ }
+ }
+
+ /* From this point on, we're not allowed to touch the packet any longer
+ * as its ref now belongs to the Rx ring.
+ */
+ skb = NULL;
+ sp = NULL;
+
+ if (last) {
+ set_bit(RXRPC_CALL_RX_LAST, &call->flags);
+ trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq);
+ } else {
+ trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq);
+ }
+
+ if (after_eq(seq, call->rx_expect_next)) {
+ if (after(seq, call->rx_expect_next)) {
+ _net("OOS %u > %u", seq, call->rx_expect_next);
+ rxrpc_send_ACK(call, RXRPC_ACK_OUT_OF_SEQUENCE, serial,
+ rxrpc_propose_ack_input_data);
+ acked = true;
+ }
+ call->rx_expect_next = seq + 1;
+ }
+
+out:
+ if (!acked &&
+ atomic_inc_return(&call->ackr_nr_unacked) > 2)
+ rxrpc_send_ACK(call, RXRPC_ACK_IDLE, serial,
+ rxrpc_propose_ack_input_data);
+ else
+ rxrpc_propose_delay_ACK(call, serial,
+ rxrpc_propose_ack_input_data);
+
+ trace_rxrpc_notify_socket(call->debug_id, serial);
+ rxrpc_notify_socket(call);
+
+ rxrpc_free_skb(skb, rxrpc_skb_freed);
+ _leave(" [queued]");
}
/*
- * Handle reception of a duplicate packet.
- *
- * We have to take care to avoid an attack here whereby we're given a series of
- * jumbograms, each with a sequence number one before the preceding one and
- * filled up to maximum UDP size. If they never send us the first packet in
- * the sequence, they can cause us to have to hold on to around 2MiB of kernel
- * space until the call times out.
- *
- * We limit the space usage by only accepting three duplicate jumbo packets per
- * call. After that, we tell the other side we're no longer accepting jumbos
- * (that information is encoded in the ACK packet).
+ * Split a jumbo packet and file the bits separately.
*/
-static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq,
- bool is_jumbo, bool *_jumbo_bad)
+static bool rxrpc_input_split_jumbo(struct rxrpc_call *call, struct sk_buff *skb)
{
- /* Discard normal packets that are duplicates. */
- if (is_jumbo)
- return;
+ struct rxrpc_jumbo_header jhdr;
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb), *jsp;
+ struct sk_buff *jskb;
+ unsigned int offset = sizeof(struct rxrpc_wire_header);
+ unsigned int len = skb->len - offset;
- /* Skip jumbo subpackets that are duplicates. When we've had three or
- * more partially duplicate jumbo packets, we refuse to take any more
- * jumbos for this call.
- */
- if (!*_jumbo_bad) {
- call->nr_jumbo_bad++;
- *_jumbo_bad = true;
+ while (sp->hdr.flags & RXRPC_JUMBO_PACKET) {
+ if (len < RXRPC_JUMBO_SUBPKTLEN)
+ goto protocol_error;
+ if (sp->hdr.flags & RXRPC_LAST_PACKET)
+ goto protocol_error;
+ if (skb_copy_bits(skb, offset + RXRPC_JUMBO_DATALEN,
+ &jhdr, sizeof(jhdr)) < 0)
+ goto protocol_error;
+
+ jskb = skb_clone(skb, GFP_ATOMIC);
+ if (!jskb) {
+ kdebug("couldn't clone");
+ return false;
+ }
+ rxrpc_new_skb(jskb, rxrpc_skb_cloned_jumbo);
+ jsp = rxrpc_skb(jskb);
+ jsp->offset = offset;
+ jsp->len = RXRPC_JUMBO_DATALEN;
+ rxrpc_input_data_one(call, jskb);
+
+ sp->hdr.flags = jhdr.flags;
+ sp->hdr._rsvd = ntohs(jhdr._rsvd);
+ sp->hdr.seq++;
+ sp->hdr.serial++;
+ offset += RXRPC_JUMBO_SUBPKTLEN;
+ len -= RXRPC_JUMBO_SUBPKTLEN;
}
+
+ sp->offset = offset;
+ sp->len = len;
+ rxrpc_input_data_one(call, skb);
+ return true;
+
+protocol_error:
+ return false;
}
/*
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
enum rxrpc_call_state state;
- unsigned int j, nr_subpackets, nr_unacked = 0;
- rxrpc_serial_t serial = sp->hdr.serial, ack_serial = serial;
- rxrpc_seq_t seq0 = sp->hdr.seq, hard_ack;
- bool jumbo_bad = false;
+ rxrpc_serial_t serial = sp->hdr.serial;
+ rxrpc_seq_t seq0 = sp->hdr.seq;
_enter("{%u,%u},{%u,%u}",
call->rx_hard_ack, call->rx_top, skb->len, seq0);
- _proto("Rx DATA %%%u { #%u f=%02x n=%u }",
- sp->hdr.serial, seq0, sp->hdr.flags, sp->nr_subpackets);
+ _proto("Rx DATA %%%u { #%u f=%02x }",
+ sp->hdr.serial, seq0, sp->hdr.flags);
state = READ_ONCE(call->state);
if (state >= RXRPC_CALL_COMPLETE) {
return;
}
+ /* Unshare the packet so that it can be modified for in-place
+ * decryption.
+ */
+ if (sp->hdr.securityIndex != 0) {
+ struct sk_buff *nskb = skb_unshare(skb, GFP_ATOMIC);
+ if (!nskb) {
+ rxrpc_eaten_skb(skb, rxrpc_skb_unshared_nomem);
+ return;
+ }
+
+ if (nskb != skb) {
+ rxrpc_eaten_skb(skb, rxrpc_skb_received);
+ skb = nskb;
+ rxrpc_new_skb(skb, rxrpc_skb_unshared);
+ sp = rxrpc_skb(skb);
+ }
+ }
+
if (state == RXRPC_CALL_SERVER_RECV_REQUEST) {
unsigned long timo = READ_ONCE(call->next_req_timo);
unsigned long now, expect_req_by;
}
}
- rxrpc_inc_stat(call->rxnet, stat_rx_data);
- if (sp->hdr.flags & RXRPC_REQUEST_ACK)
- rxrpc_inc_stat(call->rxnet, stat_rx_data_reqack);
- if (sp->hdr.flags & RXRPC_JUMBO_PACKET)
- rxrpc_inc_stat(call->rxnet, stat_rx_data_jumbo);
-
spin_lock(&call->input_lock);
/* Received data implicitly ACKs all of the request packets we sent
if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST ||
state == RXRPC_CALL_CLIENT_AWAIT_REPLY) &&
!rxrpc_receiving_reply(call))
- goto unlock;
-
- hard_ack = READ_ONCE(call->rx_hard_ack);
-
- nr_subpackets = sp->nr_subpackets;
- if (nr_subpackets > 1) {
- if (call->nr_jumbo_bad > 3) {
- rxrpc_send_ACK(call, RXRPC_ACK_NOSPACE, serial,
- rxrpc_propose_ack_input_data);
- goto unlock;
- }
- }
-
- for (j = 0; j < nr_subpackets; j++) {
- rxrpc_serial_t serial = sp->hdr.serial + j;
- rxrpc_seq_t seq = seq0 + j;
- unsigned int ix = seq & RXRPC_RXTX_BUFF_MASK;
- bool terminal = (j == nr_subpackets - 1);
- bool last = terminal && (sp->rx_flags & RXRPC_SKB_INCL_LAST);
- bool acked = false;
- u8 flags, annotation = j;
-
- _proto("Rx DATA+%u %%%u { #%x t=%u l=%u }",
- j, serial, seq, terminal, last);
-
- if (last) {
- if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
- seq != call->rx_top) {
- rxrpc_proto_abort("LSN", call, seq);
- goto unlock;
- }
- } else {
- if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
- after_eq(seq, call->rx_top)) {
- rxrpc_proto_abort("LSA", call, seq);
- goto unlock;
- }
- }
-
- flags = 0;
- if (last)
- flags |= RXRPC_LAST_PACKET;
- if (!terminal)
- flags |= RXRPC_JUMBO_PACKET;
- if (test_bit(j, sp->rx_req_ack))
- flags |= RXRPC_REQUEST_ACK;
- trace_rxrpc_rx_data(call->debug_id, seq, serial, flags, annotation);
-
- if (before_eq(seq, hard_ack)) {
- rxrpc_send_ACK(call, RXRPC_ACK_DUPLICATE, serial,
- rxrpc_propose_ack_input_data);
- continue;
- }
-
- if (call->rxtx_buffer[ix]) {
- rxrpc_input_dup_data(call, seq, nr_subpackets > 1,
- &jumbo_bad);
- rxrpc_send_ACK(call, RXRPC_ACK_DUPLICATE, serial,
- rxrpc_propose_ack_input_data);
- continue;
- }
-
- if (after(seq, hard_ack + call->rx_winsize)) {
- rxrpc_send_ACK(call, RXRPC_ACK_EXCEEDS_WINDOW, serial,
- rxrpc_propose_ack_input_data);
- if (flags & RXRPC_JUMBO_PACKET) {
- if (!jumbo_bad) {
- call->nr_jumbo_bad++;
- jumbo_bad = true;
- }
- }
-
- goto unlock;
- }
-
- if (flags & RXRPC_REQUEST_ACK) {
- rxrpc_send_ACK(call, RXRPC_ACK_REQUESTED, serial,
- rxrpc_propose_ack_input_data);
- acked = true;
- }
-
- if (after(seq0, call->ackr_highest_seq))
- call->ackr_highest_seq = seq0;
-
- /* Queue the packet. We use a couple of memory barriers here as need
- * to make sure that rx_top is perceived to be set after the buffer
- * pointer and that the buffer pointer is set after the annotation and
- * the skb data.
- *
- * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window()
- * and also rxrpc_fill_out_ack().
- */
- if (!terminal)
- rxrpc_get_skb(skb, rxrpc_skb_got);
- call->rxtx_annotations[ix] = annotation;
- smp_wmb();
- call->rxtx_buffer[ix] = skb;
- if (after(seq, call->rx_top)) {
- smp_store_release(&call->rx_top, seq);
- } else if (before(seq, call->rx_top)) {
- /* Send an immediate ACK if we fill in a hole */
- if (!acked) {
- rxrpc_send_ACK(call, RXRPC_ACK_DELAY, serial,
- rxrpc_propose_ack_input_data_hole);
- acked = true;
- }
- }
-
- if (terminal) {
- /* From this point on, we're not allowed to touch the
- * packet any longer as its ref now belongs to the Rx
- * ring.
- */
- skb = NULL;
- sp = NULL;
- }
-
- if (last) {
- set_bit(RXRPC_CALL_RX_LAST, &call->flags);
- trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq);
- } else {
- trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq);
- }
-
- if (after_eq(seq, call->rx_expect_next)) {
- if (after(seq, call->rx_expect_next)) {
- _net("OOS %u > %u", seq, call->rx_expect_next);
- rxrpc_send_ACK(call, RXRPC_ACK_OUT_OF_SEQUENCE, serial,
- rxrpc_propose_ack_input_data);
- acked = true;
- }
- call->rx_expect_next = seq + 1;
- }
+ goto out;
- if (!acked) {
- nr_unacked++;
- ack_serial = serial;
- }
+ if (!rxrpc_input_split_jumbo(call, skb)) {
+ rxrpc_proto_abort("VLD", call, sp->hdr.seq);
+ goto out;
}
+ skb = NULL;
-unlock:
- if (atomic_add_return(nr_unacked, &call->ackr_nr_unacked) > 2)
- rxrpc_send_ACK(call, RXRPC_ACK_IDLE, ack_serial,
- rxrpc_propose_ack_input_data);
- else
- rxrpc_propose_delay_ACK(call, ack_serial,
- rxrpc_propose_ack_input_data);
-
+out:
trace_rxrpc_notify_socket(call->debug_id, serial);
rxrpc_notify_socket(call);
if (sp->hdr.callNumber == 0 ||
sp->hdr.seq == 0)
goto bad_message;
- if (!rxrpc_validate_data(skb))
- goto bad_message;
/* Unshare the packet so that it can be modified for in-place
* decryption.
trace_rxrpc_rx_data(chan->call_debug_id,
sp->hdr.seq,
sp->hdr.serial,
- sp->hdr.flags, 0);
+ sp->hdr.flags);
rxrpc_post_packet_to_conn(conn, skb);
goto out;
}
return 0;
}
-static int none_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
- unsigned int offset, unsigned int len,
- rxrpc_seq_t seq, u16 expected_cksum)
+static int none_verify_packet(struct rxrpc_call *call, struct sk_buff *skb)
{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ sp->flags |= RXRPC_RX_VERIFIED;
return 0;
}
{
}
-static void none_locate_data(struct rxrpc_call *call, struct sk_buff *skb,
- unsigned int *_offset, unsigned int *_len)
-{
-}
-
static int none_respond_to_challenge(struct rxrpc_connection *conn,
struct sk_buff *skb,
u32 *_abort_code)
.how_much_data = none_how_much_data,
.secure_packet = none_secure_packet,
.verify_packet = none_verify_packet,
- .locate_data = none_locate_data,
.respond_to_challenge = none_respond_to_challenge,
.verify_response = none_verify_response,
.clear = none_clear,
mtu = conn->params.peer->if_mtu;
mtu -= conn->params.peer->hdrsize;
- jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
+ jmax = rxrpc_rx_jumbo_max;
ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
ackinfo.maxMTU = htonl(mtu);
ackinfo.rwind = htonl(call->rx_winsize);
__be16 _rsvd; /* reserved */
__be16 cksum; /* kerberos security checksum */
};
-};
+} __packed;
#define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */
#define RXRPC_JUMBO_SUBPKTLEN (RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))
rxrpc_serial_t serial;
rxrpc_seq_t hard_ack, top;
bool last = false;
- u8 subpacket;
int ix;
_enter("%d", call->debug_id);
rxrpc_see_skb(skb, rxrpc_skb_rotated);
sp = rxrpc_skb(skb);
- subpacket = call->rxtx_annotations[ix] & RXRPC_RX_ANNO_SUBPACKET;
- serial = sp->hdr.serial + subpacket;
+ serial = sp->hdr.serial;
- if (subpacket == sp->nr_subpackets - 1 &&
- sp->rx_flags & RXRPC_SKB_INCL_LAST)
+ if (sp->hdr.flags & RXRPC_LAST_PACKET)
last = true;
call->rxtx_buffer[ix] = NULL;
}
/*
- * Decrypt and verify a (sub)packet. The packet's length may be changed due to
- * padding, but if this is the case, the packet length will be resident in the
- * socket buffer. Note that we can't modify the master skb info as the skb may
- * be the home to multiple subpackets.
+ * Decrypt and verify a DATA packet.
*/
-static int rxrpc_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
- u8 annotation,
- unsigned int offset, unsigned int len)
+static int rxrpc_verify_data(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- rxrpc_seq_t seq = sp->hdr.seq;
- u16 cksum = sp->hdr.cksum;
- u8 subpacket = annotation & RXRPC_RX_ANNO_SUBPACKET;
- _enter("");
-
- /* For all but the head jumbo subpacket, the security checksum is in a
- * jumbo header immediately prior to the data.
- */
- if (subpacket > 0) {
- __be16 tmp;
- if (skb_copy_bits(skb, offset - 2, &tmp, 2) < 0)
- BUG();
- cksum = ntohs(tmp);
- seq += subpacket;
- }
-
- return call->security->verify_packet(call, skb, offset, len,
- seq, cksum);
-}
-
-/*
- * Locate the data within a packet. This is complicated by:
- *
- * (1) An skb may contain a jumbo packet - so we have to find the appropriate
- * subpacket.
- *
- * (2) The (sub)packets may be encrypted and, if so, the encrypted portion
- * contains an extra header which includes the true length of the data,
- * excluding any encrypted padding.
- */
-static int rxrpc_locate_data(struct rxrpc_call *call, struct sk_buff *skb,
- u8 *_annotation,
- unsigned int *_offset, unsigned int *_len,
- bool *_last)
-{
- struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- unsigned int offset = sizeof(struct rxrpc_wire_header);
- unsigned int len;
- bool last = false;
- int ret;
- u8 annotation = *_annotation;
- u8 subpacket = annotation & RXRPC_RX_ANNO_SUBPACKET;
-
- /* Locate the subpacket */
- offset += subpacket * RXRPC_JUMBO_SUBPKTLEN;
- len = skb->len - offset;
- if (subpacket < sp->nr_subpackets - 1)
- len = RXRPC_JUMBO_DATALEN;
- else if (sp->rx_flags & RXRPC_SKB_INCL_LAST)
- last = true;
-
- if (!(annotation & RXRPC_RX_ANNO_VERIFIED)) {
- ret = rxrpc_verify_packet(call, skb, annotation, offset, len);
- if (ret < 0)
- return ret;
- *_annotation |= RXRPC_RX_ANNO_VERIFIED;
- }
-
- *_offset = offset;
- *_len = len;
- *_last = last;
- call->security->locate_data(call, skb, _offset, _len);
- return 0;
+ if (sp->flags & RXRPC_RX_VERIFIED)
+ return 0;
+ return call->security->verify_packet(call, skb);
}
/*
rxrpc_serial_t serial;
rxrpc_seq_t hard_ack, top, seq;
size_t remain;
- bool rx_pkt_last;
unsigned int rx_pkt_offset, rx_pkt_len;
int ix, copy, ret = -EAGAIN, ret2;
rx_pkt_offset = call->rx_pkt_offset;
rx_pkt_len = call->rx_pkt_len;
- rx_pkt_last = call->rx_pkt_last;
if (call->state >= RXRPC_CALL_SERVER_ACK_REQUEST) {
seq = call->rx_hard_ack;
if (!(flags & MSG_PEEK)) {
serial = sp->hdr.serial;
- serial += call->rxtx_annotations[ix] & RXRPC_RX_ANNO_SUBPACKET;
trace_rxrpc_receive(call, rxrpc_receive_front,
serial, seq);
}
sock_recv_timestamp(msg, sock->sk, skb);
if (rx_pkt_offset == 0) {
- ret2 = rxrpc_locate_data(call, skb,
- &call->rxtx_annotations[ix],
- &rx_pkt_offset, &rx_pkt_len,
- &rx_pkt_last);
+ ret2 = rxrpc_verify_data(call, skb);
+ rx_pkt_offset = sp->offset;
+ rx_pkt_len = sp->len;
trace_rxrpc_recvdata(call, rxrpc_recvmsg_next, seq,
rx_pkt_offset, rx_pkt_len, ret2);
if (ret2 < 0) {
}
/* The whole packet has been transferred. */
- if (!(flags & MSG_PEEK))
- rxrpc_rotate_rx_window(call);
+ if (sp->hdr.flags & RXRPC_LAST_PACKET)
+ ret = 1;
rx_pkt_offset = 0;
rx_pkt_len = 0;
- if (rx_pkt_last) {
- ASSERTCMP(seq, ==, READ_ONCE(call->rx_top));
- ret = 1;
- goto out;
- }
+ if (!(flags & MSG_PEEK))
+ rxrpc_rotate_rx_window(call);
seq++;
}
if (!(flags & MSG_PEEK)) {
call->rx_pkt_offset = rx_pkt_offset;
call->rx_pkt_len = rx_pkt_len;
- call->rx_pkt_last = rx_pkt_last;
}
done:
trace_rxrpc_recvdata(call, rxrpc_recvmsg_data_return, seq,
* decrypt partial encryption on a packet (level 1 security)
*/
static int rxkad_verify_packet_1(struct rxrpc_call *call, struct sk_buff *skb,
- unsigned int offset, unsigned int len,
rxrpc_seq_t seq,
struct skcipher_request *req)
{
struct rxkad_level1_hdr sechdr;
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct rxrpc_crypt iv;
struct scatterlist sg[16];
bool aborted;
_enter("");
- if (len < 8) {
+ if (sp->len < 8) {
aborted = rxrpc_abort_eproto(call, skb, "rxkad_1_hdr", "V1H",
- RXKADSEALEDINCON);
+ RXKADSEALEDINCON);
goto protocol_error;
}
* directly into the target buffer.
*/
sg_init_table(sg, ARRAY_SIZE(sg));
- ret = skb_to_sgvec(skb, sg, offset, 8);
+ ret = skb_to_sgvec(skb, sg, sp->offset, 8);
if (unlikely(ret < 0))
return ret;
skcipher_request_zero(req);
/* Extract the decrypted packet length */
- if (skb_copy_bits(skb, offset, &sechdr, sizeof(sechdr)) < 0) {
+ if (skb_copy_bits(skb, sp->offset, &sechdr, sizeof(sechdr)) < 0) {
aborted = rxrpc_abort_eproto(call, skb, "rxkad_1_len", "XV1",
RXKADDATALEN);
goto protocol_error;
}
- len -= sizeof(sechdr);
+ sp->offset += sizeof(sechdr);
+ sp->len -= sizeof(sechdr);
buf = ntohl(sechdr.data_size);
data_size = buf & 0xffff;
goto protocol_error;
}
- if (data_size > len) {
+ if (data_size > sp->len) {
aborted = rxrpc_abort_eproto(call, skb, "rxkad_1_datalen", "V1L",
RXKADDATALEN);
goto protocol_error;
}
+ sp->len = data_size;
_leave(" = 0 [dlen=%x]", data_size);
return 0;
* wholly decrypt a packet (level 2 security)
*/
static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb,
- unsigned int offset, unsigned int len,
rxrpc_seq_t seq,
struct skcipher_request *req)
{
const struct rxrpc_key_token *token;
struct rxkad_level2_hdr sechdr;
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct rxrpc_crypt iv;
struct scatterlist _sg[4], *sg;
bool aborted;
u16 check;
int nsg, ret;
- _enter(",{%d}", skb->len);
+ _enter(",{%d}", sp->len);
- if (len < 8) {
+ if (sp->len < 8) {
aborted = rxrpc_abort_eproto(call, skb, "rxkad_2_hdr", "V2H",
RXKADSEALEDINCON);
goto protocol_error;
}
sg_init_table(sg, nsg);
- ret = skb_to_sgvec(skb, sg, offset, len);
+ ret = skb_to_sgvec(skb, sg, sp->offset, sp->len);
if (unlikely(ret < 0)) {
if (sg != _sg)
kfree(sg);
skcipher_request_set_sync_tfm(req, call->conn->rxkad.cipher);
skcipher_request_set_callback(req, 0, NULL, NULL);
- skcipher_request_set_crypt(req, sg, sg, len, iv.x);
+ skcipher_request_set_crypt(req, sg, sg, sp->len, iv.x);
crypto_skcipher_decrypt(req);
skcipher_request_zero(req);
if (sg != _sg)
kfree(sg);
/* Extract the decrypted packet length */
- if (skb_copy_bits(skb, offset, &sechdr, sizeof(sechdr)) < 0) {
+ if (skb_copy_bits(skb, sp->offset, &sechdr, sizeof(sechdr)) < 0) {
aborted = rxrpc_abort_eproto(call, skb, "rxkad_2_len", "XV2",
RXKADDATALEN);
goto protocol_error;
}
- len -= sizeof(sechdr);
+ sp->offset += sizeof(sechdr);
+ sp->len -= sizeof(sechdr);
buf = ntohl(sechdr.data_size);
data_size = buf & 0xffff;
goto protocol_error;
}
- if (data_size > len) {
+ if (data_size > sp->len) {
aborted = rxrpc_abort_eproto(call, skb, "rxkad_2_datalen", "V2L",
RXKADDATALEN);
goto protocol_error;
}
+ sp->len = data_size;
_leave(" = 0 [dlen=%x]", data_size);
return 0;
}
/*
- * Verify the security on a received packet or subpacket (if part of a
- * jumbo packet).
+ * Verify the security on a received packet and the subpackets therein.
*/
-static int rxkad_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
- unsigned int offset, unsigned int len,
- rxrpc_seq_t seq, u16 expected_cksum)
+static int rxkad_verify_packet(struct rxrpc_call *call, struct sk_buff *skb)
{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct skcipher_request *req;
struct rxrpc_crypt iv;
struct scatterlist sg;
+ rxrpc_seq_t seq = sp->hdr.seq;
bool aborted;
u16 cksum;
u32 x, y;
if (cksum == 0)
cksum = 1; /* zero checksums are not permitted */
- if (cksum != expected_cksum) {
+ if (cksum != sp->hdr.cksum) {
aborted = rxrpc_abort_eproto(call, skb, "rxkad_csum", "VCK",
RXKADSEALEDINCON);
goto protocol_error;
case RXRPC_SECURITY_PLAIN:
return 0;
case RXRPC_SECURITY_AUTH:
- return rxkad_verify_packet_1(call, skb, offset, len, seq, req);
+ return rxkad_verify_packet_1(call, skb, seq, req);
case RXRPC_SECURITY_ENCRYPT:
- return rxkad_verify_packet_2(call, skb, offset, len, seq, req);
+ return rxkad_verify_packet_2(call, skb, seq, req);
default:
return -ENOANO;
}
return -EPROTO;
}
-/*
- * Locate the data contained in a packet that was partially encrypted.
- */
-static void rxkad_locate_data_1(struct rxrpc_call *call, struct sk_buff *skb,
- unsigned int *_offset, unsigned int *_len)
-{
- struct rxkad_level1_hdr sechdr;
-
- if (skb_copy_bits(skb, *_offset, &sechdr, sizeof(sechdr)) < 0)
- BUG();
- *_offset += sizeof(sechdr);
- *_len = ntohl(sechdr.data_size) & 0xffff;
-}
-
-/*
- * Locate the data contained in a packet that was completely encrypted.
- */
-static void rxkad_locate_data_2(struct rxrpc_call *call, struct sk_buff *skb,
- unsigned int *_offset, unsigned int *_len)
-{
- struct rxkad_level2_hdr sechdr;
-
- if (skb_copy_bits(skb, *_offset, &sechdr, sizeof(sechdr)) < 0)
- BUG();
- *_offset += sizeof(sechdr);
- *_len = ntohl(sechdr.data_size) & 0xffff;
-}
-
-/*
- * Locate the data contained in an already decrypted packet.
- */
-static void rxkad_locate_data(struct rxrpc_call *call, struct sk_buff *skb,
- unsigned int *_offset, unsigned int *_len)
-{
- switch (call->conn->params.security_level) {
- case RXRPC_SECURITY_AUTH:
- rxkad_locate_data_1(call, skb, _offset, _len);
- return;
- case RXRPC_SECURITY_ENCRYPT:
- rxkad_locate_data_2(call, skb, _offset, _len);
- return;
- default:
- return;
- }
-}
-
/*
* issue a challenge
*/
.secure_packet = rxkad_secure_packet,
.verify_packet = rxkad_verify_packet,
.free_call_crypto = rxkad_free_call_crypto,
- .locate_data = rxkad_locate_data,
.issue_challenge = rxkad_issue_challenge,
.respond_to_challenge = rxkad_respond_to_challenge,
.verify_response = rxkad_verify_response,
projects / nvme.git / commitdiff