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Diffstat (limited to 'lib/tests/blackhole_dev_kunit.c')
| -rw-r--r-- | lib/tests/blackhole_dev_kunit.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/lib/tests/blackhole_dev_kunit.c b/lib/tests/blackhole_dev_kunit.c new file mode 100644 index 000000000000..06834ab35f43 --- /dev/null +++ b/lib/tests/blackhole_dev_kunit.c @@ -0,0 +1,85 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This tests the blackhole_dev that is created during the + * net subsystem initialization. The test this module performs is + * by injecting an skb into the stack with skb->dev as the + * blackhole_dev and expects kernel to behave in a sane manner + * (in other words, *not crash*)! + * + * Copyright (c) 2018, Mahesh Bandewar <maheshb@google.com> + */ + +#include <kunit/test.h> +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/netdevice.h> +#include <linux/udp.h> +#include <linux/ipv6.h> + +#include <net/dst.h> + +#define SKB_SIZE 256 +#define HEAD_SIZE (14+40+8) /* Ether + IPv6 + UDP */ +#define TAIL_SIZE 32 /* random tail-room */ + +#define UDP_PORT 1234 + +static void test_blackholedev(struct kunit *test) +{ + struct ipv6hdr *ip6h; + struct sk_buff *skb; + struct udphdr *uh; + int data_len; + + skb = alloc_skb(SKB_SIZE, GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, skb); + + /* Reserve head-room for the headers */ + skb_reserve(skb, HEAD_SIZE); + + /* Add data to the skb */ + data_len = SKB_SIZE - (HEAD_SIZE + TAIL_SIZE); + memset(__skb_put(skb, data_len), 0xf, data_len); + + /* Add protocol data */ + /* (Transport) UDP */ + uh = (struct udphdr *)skb_push(skb, sizeof(struct udphdr)); + skb_set_transport_header(skb, 0); + uh->source = uh->dest = htons(UDP_PORT); + uh->len = htons(data_len); + uh->check = 0; + /* (Network) IPv6 */ + ip6h = (struct ipv6hdr *)skb_push(skb, sizeof(struct ipv6hdr)); + skb_set_network_header(skb, 0); + ip6h->hop_limit = 32; + ip6h->payload_len = htons(data_len + sizeof(struct udphdr)); + ip6h->nexthdr = IPPROTO_UDP; + ip6h->saddr = in6addr_loopback; + ip6h->daddr = in6addr_loopback; + /* Ether */ + skb_push(skb, sizeof(struct ethhdr)); + skb_set_mac_header(skb, 0); + + skb->protocol = htons(ETH_P_IPV6); + skb->pkt_type = PACKET_HOST; + skb->dev = blackhole_netdev; + + /* Now attempt to send the packet */ + KUNIT_EXPECT_EQ(test, dev_queue_xmit(skb), NET_XMIT_SUCCESS); +} + +static struct kunit_case blackholedev_cases[] = { + KUNIT_CASE(test_blackholedev), + {}, +}; + +static struct kunit_suite blackholedev_suite = { + .name = "blackholedev", + .test_cases = blackholedev_cases, +}; + +kunit_test_suite(blackholedev_suite); + +MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); +MODULE_DESCRIPTION("module test of the blackhole_dev"); +MODULE_LICENSE("GPL"); |