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s390/qeth: guard against runt packets

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Depending on a packet's type, the RX path needs to access fields in the
packet headers and thus requires a minimum packet length.
Enforce this length when building the skb.

On the other hand a single runt packet is no reason to drop the whole
RX buffer. So just skip it, and continue processing on the next packet.

Fixes: 4a71df5004 ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-12-05 14:33:02 +01:00 committed by David S. Miller
parent a350d2e7ad
commit 5b55633f20
3 changed files with 23 additions and 6 deletions
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1
drivers/s390/net/qeth_core.h
View File

@ -480,6 +480,7 @@ struct qeth_card_stats {
u64 rx_dropped_nomem;
u64 rx_dropped_notsupp;
u64 rx_dropped_runt;
/* rtnl_link_stats64 */
u64 rx_packets;

27
drivers/s390/net/qeth_core_main.c
View File

@ -5063,9 +5063,9 @@ struct sk_buff *qeth_core_get_next_skb(struct qeth_card *card,
{
struct qdio_buffer_element *element = *__element;
struct qdio_buffer *buffer = qethbuffer->buffer;
unsigned int headroom, linear_len;
int offset = *__offset;
bool use_rx_sg = false;
unsigned int headroom;
struct sk_buff *skb;
int skb_len = 0;
void *data_ptr;
@ -5082,29 +5082,41 @@ next_packet:
*hdr = element->addr + offset;
offset += sizeof(struct qeth_hdr);
skb = NULL;
switch ((*hdr)->hdr.l2.id) {
case QETH_HEADER_TYPE_LAYER2:
skb_len = (*hdr)->hdr.l2.pkt_length;
linear_len = ETH_HLEN;
headroom = 0;
break;
case QETH_HEADER_TYPE_LAYER3:
skb_len = (*hdr)->hdr.l3.length;
if (!IS_LAYER3(card)) {
QETH_CARD_STAT_INC(card, rx_dropped_notsupp);
skb = NULL;
goto walk_packet;
}
if ((*hdr)->hdr.l3.flags & QETH_HDR_PASSTHRU) {
linear_len = ETH_HLEN;
headroom = 0;
break;
}
if ((*hdr)->hdr.l3.flags & QETH_HDR_IPV6)
linear_len = sizeof(struct ipv6hdr);
else
linear_len = sizeof(struct iphdr);
headroom = ETH_HLEN;
break;
case QETH_HEADER_TYPE_OSN:
skb_len = (*hdr)->hdr.osn.pdu_length;
if (!IS_OSN(card)) {
QETH_CARD_STAT_INC(card, rx_dropped_notsupp);
skb = NULL;
goto walk_packet;
}
linear_len = skb_len;
headroom = sizeof(struct qeth_hdr);
break;
default:
@ -5117,8 +5129,10 @@ next_packet:
return NULL;
}
if (!skb_len)
return NULL;
if (skb_len < linear_len) {
QETH_CARD_STAT_INC(card, rx_dropped_runt);
goto walk_packet;
}
use_rx_sg = (card->options.cq == QETH_CQ_ENABLED) ||
((skb_len >= card->options.rx_sg_cb) &&
@ -6268,7 +6282,8 @@ void qeth_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
card->stats.rx_frame_errors +
card->stats.rx_fifo_errors;
stats->rx_dropped = card->stats.rx_dropped_nomem +
card->stats.rx_dropped_notsupp;
card->stats.rx_dropped_notsupp +
card->stats.rx_dropped_runt;
stats->multicast = card->stats.rx_multicast;
stats->rx_length_errors = card->stats.rx_length_errors;
stats->rx_frame_errors = card->stats.rx_frame_errors;

1
drivers/s390/net/qeth_ethtool.c
View File

@ -51,6 +51,7 @@ static const struct qeth_stats card_stats[] = {
QETH_CARD_STAT("rx0 SG page allocs", rx_sg_alloc_page),
QETH_CARD_STAT("rx0 dropped, no memory", rx_dropped_nomem),
QETH_CARD_STAT("rx0 dropped, bad format", rx_dropped_notsupp),
QETH_CARD_STAT("rx0 dropped, runt", rx_dropped_runt),
};
#define TXQ_STATS_LEN ARRAY_SIZE(txq_stats)