Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586// 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");