tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NETWORK_HELPERS_H
3#define __NETWORK_HELPERS_H
4#include <arpa/inet.h>
5#include <sys/socket.h>
6#include <sys/types.h>
7#include <linux/types.h>
8typedef __u16 __sum16;
9#include <linux/if_ether.h>
10#include <linux/if_packet.h>
11#include <linux/if_tun.h>
12#include <linux/ip.h>
13#include <linux/ipv6.h>
14#include <linux/ethtool.h>
15#include <linux/sockios.h>
16#include <linux/err.h>
17#include <netinet/tcp.h>
18#include <netinet/udp.h>
19#include <bpf/bpf_endian.h>
20#include <net/if.h>
21#include <stdio.h>
22
23#define MAGIC_VAL 0x1234
24#define NUM_ITER 100000
25#define VIP_NUM 5
26#define MAGIC_BYTES 123
27
28struct network_helper_opts {
29 int timeout_ms;
30 int proto;
31 /* +ve: Passed to listen() as-is.
32 * 0: Default when the test does not set
33 * a particular value during the struct init.
34 * It is changed to 1 before passing to listen().
35 * Most tests only have one on-going connection.
36 * -ve: It is changed to 0 before passing to listen().
37 * It is useful to force syncookie without
38 * changing the "tcp_syncookies" sysctl from 1 to 2.
39 */
40 int backlog;
41 int (*post_socket_cb)(int fd, void *opts);
42 void *cb_opts;
43};
44
45/* ipv4 test vector */
46struct ipv4_packet {
47 struct ethhdr eth;
48 struct iphdr iph;
49 struct tcphdr tcp;
50} __packed;
51extern struct ipv4_packet pkt_v4;
52
53/* ipv6 test vector */
54struct ipv6_packet {
55 struct ethhdr eth;
56 struct ipv6hdr iph;
57 struct tcphdr tcp;
58} __packed;
59extern struct ipv6_packet pkt_v6;
60
61int settimeo(int fd, int timeout_ms);
62int start_server_str(int family, int type, const char *addr_str, __u16 port,
63 const struct network_helper_opts *opts);
64int start_server(int family, int type, const char *addr, __u16 port,
65 int timeout_ms);
66int *start_reuseport_server(int family, int type, const char *addr_str,
67 __u16 port, int timeout_ms,
68 unsigned int nr_listens);
69int start_server_addr(int type, const struct sockaddr_storage *addr, socklen_t len,
70 const struct network_helper_opts *opts);
71void free_fds(int *fds, unsigned int nr_close_fds);
72int client_socket(int family, int type,
73 const struct network_helper_opts *opts);
74int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t len,
75 const struct network_helper_opts *opts);
76int connect_to_addr_str(int family, int type, const char *addr_str, __u16 port,
77 const struct network_helper_opts *opts);
78int connect_to_fd(int server_fd, int timeout_ms);
79int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts);
80int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms);
81int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
82 int timeout_ms);
83int make_sockaddr(int family, const char *addr_str, __u16 port,
84 struct sockaddr_storage *addr, socklen_t *len);
85char *ping_command(int family);
86int get_socket_local_port(int sock_fd);
87int get_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param);
88int set_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param);
89
90int open_tuntap(const char *dev_name, bool need_mac);
91
92struct nstoken;
93/**
94 * open_netns() - Switch to specified network namespace by name.
95 *
96 * Returns token with which to restore the original namespace
97 * using close_netns().
98 */
99struct nstoken *open_netns(const char *name);
100void close_netns(struct nstoken *token);
101int send_recv_data(int lfd, int fd, uint32_t total_bytes);
102int make_netns(const char *name);
103int remove_netns(const char *name);
104
105/**
106 * append_tid() - Append thread ID to the given string.
107 *
108 * @str: string to extend
109 * @sz: string's size
110 *
111 * 8 characters are used to append the thread ID (7 digits + '\0')
112 *
113 * Returns -1 on errors, 0 otherwise
114 */
115int append_tid(char *str, size_t sz);
116
117static __u16 csum_fold(__u32 csum)
118{
119 csum = (csum & 0xffff) + (csum >> 16);
120 csum = (csum & 0xffff) + (csum >> 16);
121
122 return (__u16)~csum;
123}
124
125static __wsum csum_partial(const void *buf, int len, __wsum sum)
126{
127 __u16 *p = (__u16 *)buf;
128 int num_u16 = len >> 1;
129 int i;
130
131 for (i = 0; i < num_u16; i++)
132 sum += p[i];
133
134 return sum;
135}
136
137static inline __sum16 build_ip_csum(struct iphdr *iph)
138{
139 __u32 sum = 0;
140 __u16 *p;
141
142 iph->check = 0;
143 p = (void *)iph;
144 sum = csum_partial(p, iph->ihl << 2, 0);
145
146 return csum_fold(sum);
147}
148
149/**
150 * csum_tcpudp_magic - compute IP pseudo-header checksum
151 *
152 * Compute the IPv4 pseudo header checksum. The helper can take a
153 * accumulated sum from the transport layer to accumulate it and directly
154 * return the transport layer
155 *
156 * @saddr: IP source address
157 * @daddr: IP dest address
158 * @len: IP data size
159 * @proto: transport layer protocol
160 * @csum: The accumulated partial sum to add to the computation
161 *
162 * Returns the folded sum
163 */
164static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
165 __u32 len, __u8 proto,
166 __wsum csum)
167{
168 __u64 s = csum;
169
170 s += (__u32)saddr;
171 s += (__u32)daddr;
172 s += htons(proto + len);
173 s = (s & 0xffffffff) + (s >> 32);
174 s = (s & 0xffffffff) + (s >> 32);
175
176 return csum_fold((__u32)s);
177}
178
179/**
180 * csum_ipv6_magic - compute IPv6 pseudo-header checksum
181 *
182 * Compute the ipv6 pseudo header checksum. The helper can take a
183 * accumulated sum from the transport layer to accumulate it and directly
184 * return the transport layer
185 *
186 * @saddr: IPv6 source address
187 * @daddr: IPv6 dest address
188 * @len: IPv6 data size
189 * @proto: transport layer protocol
190 * @csum: The accumulated partial sum to add to the computation
191 *
192 * Returns the folded sum
193 */
194static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
195 const struct in6_addr *daddr,
196 __u32 len, __u8 proto,
197 __wsum csum)
198{
199 __u64 s = csum;
200 int i;
201
202 for (i = 0; i < 4; i++)
203 s += (__u32)saddr->s6_addr32[i];
204 for (i = 0; i < 4; i++)
205 s += (__u32)daddr->s6_addr32[i];
206 s += htons(proto + len);
207 s = (s & 0xffffffff) + (s >> 32);
208 s = (s & 0xffffffff) + (s >> 32);
209
210 return csum_fold((__u32)s);
211}
212
213/**
214 * build_udp_v4_csum - compute UDP checksum for UDP over IPv4
215 *
216 * Compute the checksum to embed in UDP header, composed of the sum of IP
217 * pseudo-header checksum, UDP header checksum and UDP data checksum
218 * @iph IP header
219 * @udph UDP header, which must be immediately followed by UDP data
220 *
221 * Returns the total checksum
222 */
223
224static inline __sum16 build_udp_v4_csum(const struct iphdr *iph,
225 const struct udphdr *udph)
226{
227 unsigned long sum;
228
229 sum = csum_partial(udph, ntohs(udph->len), 0);
230 return csum_tcpudp_magic(iph->saddr, iph->daddr, ntohs(udph->len),
231 IPPROTO_UDP, sum);
232}
233
234/**
235 * build_udp_v6_csum - compute UDP checksum for UDP over IPv6
236 *
237 * Compute the checksum to embed in UDP header, composed of the sum of IPv6
238 * pseudo-header checksum, UDP header checksum and UDP data checksum
239 * @ip6h IPv6 header
240 * @udph UDP header, which must be immediately followed by UDP data
241 *
242 * Returns the total checksum
243 */
244static inline __sum16 build_udp_v6_csum(const struct ipv6hdr *ip6h,
245 const struct udphdr *udph)
246{
247 unsigned long sum;
248
249 sum = csum_partial(udph, ntohs(udph->len), 0);
250 return csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ntohs(udph->len),
251 IPPROTO_UDP, sum);
252}
253
254struct tmonitor_ctx;
255
256typedef int (*tm_print_fn_t)(const char *format, va_list args);
257
258#ifdef TRAFFIC_MONITOR
259struct tmonitor_ctx *traffic_monitor_start(const char *netns, const char *test_name,
260 const char *subtest_name);
261void traffic_monitor_stop(struct tmonitor_ctx *ctx);
262tm_print_fn_t traffic_monitor_set_print(tm_print_fn_t fn);
263#else
264static inline struct tmonitor_ctx *traffic_monitor_start(const char *netns, const char *test_name,
265 const char *subtest_name)
266{
267 return NULL;
268}
269
270static inline void traffic_monitor_stop(struct tmonitor_ctx *ctx)
271{
272}
273
274static inline tm_print_fn_t traffic_monitor_set_print(tm_print_fn_t fn)
275{
276 return NULL;
277}
278#endif
279
280#endif