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Linux/tools/testing/selftests/net/reuseport_dualstack.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * It is possible to use SO_REUSEPORT to open multiple sockets bound to
  4  * equivalent local addresses using AF_INET and AF_INET6 at the same time.  If
  5  * the AF_INET6 socket has IPV6_V6ONLY set, it's clear which socket should
  6  * receive a given incoming packet.  However, when it is not set, incoming v4
  7  * packets should prefer the AF_INET socket(s).  This behavior was defined with
  8  * the original SO_REUSEPORT implementation, but broke with
  9  * e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection")
 10  * This test creates these mixed AF_INET/AF_INET6 sockets and asserts the
 11  * AF_INET preference for v4 packets.
 12  */
 13 
 14 #define _GNU_SOURCE
 15 
 16 #include <arpa/inet.h>
 17 #include <errno.h>
 18 #include <error.h>
 19 #include <linux/in.h>
 20 #include <linux/unistd.h>
 21 #include <stdio.h>
 22 #include <stdlib.h>
 23 #include <string.h>
 24 #include <sys/epoll.h>
 25 #include <sys/types.h>
 26 #include <sys/socket.h>
 27 #include <unistd.h>
 28 
 29 static const int PORT = 8888;
 30 
 31 static void build_rcv_fd(int family, int proto, int *rcv_fds, int count)
 32 {
 33         struct sockaddr_storage addr;
 34         struct sockaddr_in  *addr4;
 35         struct sockaddr_in6 *addr6;
 36         int opt, i;
 37 
 38         switch (family) {
 39         case AF_INET:
 40                 addr4 = (struct sockaddr_in *)&addr;
 41                 addr4->sin_family = AF_INET;
 42                 addr4->sin_addr.s_addr = htonl(INADDR_ANY);
 43                 addr4->sin_port = htons(PORT);
 44                 break;
 45         case AF_INET6:
 46                 addr6 = (struct sockaddr_in6 *)&addr;
 47                 addr6->sin6_family = AF_INET6;
 48                 addr6->sin6_addr = in6addr_any;
 49                 addr6->sin6_port = htons(PORT);
 50                 break;
 51         default:
 52                 error(1, 0, "Unsupported family %d", family);
 53         }
 54 
 55         for (i = 0; i < count; ++i) {
 56                 rcv_fds[i] = socket(family, proto, 0);
 57                 if (rcv_fds[i] < 0)
 58                         error(1, errno, "failed to create receive socket");
 59 
 60                 opt = 1;
 61                 if (setsockopt(rcv_fds[i], SOL_SOCKET, SO_REUSEPORT, &opt,
 62                                sizeof(opt)))
 63                         error(1, errno, "failed to set SO_REUSEPORT");
 64 
 65                 if (bind(rcv_fds[i], (struct sockaddr *)&addr, sizeof(addr)))
 66                         error(1, errno, "failed to bind receive socket");
 67 
 68                 if (proto == SOCK_STREAM && listen(rcv_fds[i], 10))
 69                         error(1, errno, "failed to listen on receive port");
 70         }
 71 }
 72 
 73 static void send_from_v4(int proto)
 74 {
 75         struct sockaddr_in  saddr, daddr;
 76         int fd;
 77 
 78         saddr.sin_family = AF_INET;
 79         saddr.sin_addr.s_addr = htonl(INADDR_ANY);
 80         saddr.sin_port = 0;
 81 
 82         daddr.sin_family = AF_INET;
 83         daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 84         daddr.sin_port = htons(PORT);
 85 
 86         fd = socket(AF_INET, proto, 0);
 87         if (fd < 0)
 88                 error(1, errno, "failed to create send socket");
 89 
 90         if (bind(fd, (struct sockaddr *)&saddr, sizeof(saddr)))
 91                 error(1, errno, "failed to bind send socket");
 92 
 93         if (connect(fd, (struct sockaddr *)&daddr, sizeof(daddr)))
 94                 error(1, errno, "failed to connect send socket");
 95 
 96         if (send(fd, "a", 1, 0) < 0)
 97                 error(1, errno, "failed to send message");
 98 
 99         close(fd);
100 }
101 
102 static int receive_once(int epfd, int proto)
103 {
104         struct epoll_event ev;
105         int i, fd;
106         char buf[8];
107 
108         i = epoll_wait(epfd, &ev, 1, -1);
109         if (i < 0)
110                 error(1, errno, "epoll_wait failed");
111 
112         if (proto == SOCK_STREAM) {
113                 fd = accept(ev.data.fd, NULL, NULL);
114                 if (fd < 0)
115                         error(1, errno, "failed to accept");
116                 i = recv(fd, buf, sizeof(buf), 0);
117                 close(fd);
118         } else {
119                 i = recv(ev.data.fd, buf, sizeof(buf), 0);
120         }
121 
122         if (i < 0)
123                 error(1, errno, "failed to recv");
124 
125         return ev.data.fd;
126 }
127 
128 static void test(int *rcv_fds, int count, int proto)
129 {
130         struct epoll_event ev;
131         int epfd, i, test_fd;
132         uint16_t test_family;
133         socklen_t len;
134 
135         epfd = epoll_create(1);
136         if (epfd < 0)
137                 error(1, errno, "failed to create epoll");
138 
139         ev.events = EPOLLIN;
140         for (i = 0; i < count; ++i) {
141                 ev.data.fd = rcv_fds[i];
142                 if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fds[i], &ev))
143                         error(1, errno, "failed to register sock epoll");
144         }
145 
146         send_from_v4(proto);
147 
148         test_fd = receive_once(epfd, proto);
149         if (getsockopt(test_fd, SOL_SOCKET, SO_DOMAIN, &test_family, &len))
150                 error(1, errno, "failed to read socket domain");
151         if (test_family != AF_INET)
152                 error(1, 0, "expected to receive on v4 socket but got v6 (%d)",
153                       test_family);
154 
155         close(epfd);
156 }
157 
158 int main(void)
159 {
160         int rcv_fds[32], i;
161 
162         fprintf(stderr, "---- UDP IPv4 created before IPv6 ----\n");
163         build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 5);
164         build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[5]), 5);
165         test(rcv_fds, 10, SOCK_DGRAM);
166         for (i = 0; i < 10; ++i)
167                 close(rcv_fds[i]);
168 
169         fprintf(stderr, "---- UDP IPv6 created before IPv4 ----\n");
170         build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds, 5);
171         build_rcv_fd(AF_INET, SOCK_DGRAM, &(rcv_fds[5]), 5);
172         test(rcv_fds, 10, SOCK_DGRAM);
173         for (i = 0; i < 10; ++i)
174                 close(rcv_fds[i]);
175 
176         /* NOTE: UDP socket lookups traverse a different code path when there
177          * are > 10 sockets in a group.
178          */
179         fprintf(stderr, "---- UDP IPv4 created before IPv6 (large) ----\n");
180         build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 16);
181         build_rcv_fd(AF_INET6, SOCK_DGRAM, &(rcv_fds[16]), 16);
182         test(rcv_fds, 32, SOCK_DGRAM);
183         for (i = 0; i < 32; ++i)
184                 close(rcv_fds[i]);
185 
186         fprintf(stderr, "---- UDP IPv6 created before IPv4 (large) ----\n");
187         build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds, 16);
188         build_rcv_fd(AF_INET, SOCK_DGRAM, &(rcv_fds[16]), 16);
189         test(rcv_fds, 32, SOCK_DGRAM);
190         for (i = 0; i < 32; ++i)
191                 close(rcv_fds[i]);
192 
193         fprintf(stderr, "---- TCP IPv4 created before IPv6 ----\n");
194         build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 5);
195         build_rcv_fd(AF_INET6, SOCK_STREAM, &(rcv_fds[5]), 5);
196         test(rcv_fds, 10, SOCK_STREAM);
197         for (i = 0; i < 10; ++i)
198                 close(rcv_fds[i]);
199 
200         fprintf(stderr, "---- TCP IPv6 created before IPv4 ----\n");
201         build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds, 5);
202         build_rcv_fd(AF_INET, SOCK_STREAM, &(rcv_fds[5]), 5);
203         test(rcv_fds, 10, SOCK_STREAM);
204         for (i = 0; i < 10; ++i)
205                 close(rcv_fds[i]);
206 
207         fprintf(stderr, "SUCCESS\n");
208         return 0;
209 }
210 

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