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rxrpc: Improve jumbo packet counting

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Improve the information stored about jumbo packets so that we don't need to
reparse them so much later.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
This commit is contained in:
David Howells
2019-08-19 09:25:37 +01:00
parent cfef46d692
commit c3c9e3df49
3 changed files with 30 additions and 12 deletions
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23
net/rxrpc/input.c
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@@ -347,7 +347,7 @@ static bool rxrpc_receiving_reply(struct rxrpc_call *call)
}
/*
* Scan a jumbo packet to validate its structure and to work out how many
* 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
@@ -358,16 +358,21 @@ static bool rxrpc_receiving_reply(struct rxrpc_call *call)
* the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any
* size.
*/
static bool rxrpc_validate_jumbo(struct sk_buff *skb)
static bool rxrpc_validate_data(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;
int nr_jumbo = 1;
u8 flags = sp->hdr.flags;
do {
nr_jumbo++;
for (;;) {
if (flags & RXRPC_REQUEST_ACK)
__set_bit(sp->nr_subpackets, sp->rx_req_ack);
sp->nr_subpackets++;
if (!(flags & RXRPC_JUMBO_PACKET))
break;
if (len - offset < RXRPC_JUMBO_SUBPKTLEN)
goto protocol_error;
if (flags & RXRPC_LAST_PACKET)
@@ -376,9 +381,10 @@ static bool rxrpc_validate_jumbo(struct sk_buff *skb)
if (skb_copy_bits(skb, offset, &flags, 1) < 0)
goto protocol_error;
offset += sizeof(struct rxrpc_jumbo_header);
} while (flags & RXRPC_JUMBO_PACKET);
}
sp->nr_jumbo = nr_jumbo;
if (flags & RXRPC_LAST_PACKET)
sp->rx_flags |= RXRPC_SKB_INCL_LAST;
return true;
protocol_error:
@@ -1237,8 +1243,7 @@ int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb)
if (sp->hdr.callNumber == 0 ||
sp->hdr.seq == 0)
goto bad_message;
if (sp->hdr.flags & RXRPC_JUMBO_PACKET &&
!rxrpc_validate_jumbo(skb))
if (!rxrpc_validate_data(skb))
goto bad_message;
break;