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