|
| 1 | +#include <stdio.h> |
| 2 | +#include <stdlib.h> |
| 3 | + |
| 4 | +#include "netdev.h" |
| 5 | + |
| 6 | +/* Slirp callback: invoked when Slirp wants to send a packet to the backend */ |
| 7 | +static ssize_t net_slirp_send_packet(const void *buf, size_t len, void *opaque) |
| 8 | +{ |
| 9 | + net_user_options_t *usr = (net_user_options_t *) opaque; |
| 10 | + |
| 11 | + return write(usr->channel[SLIRP_WRITE_SIDE], buf, len); |
| 12 | +} |
| 13 | + |
| 14 | +/* Slirp callback: reports an error from the guest (current unused) */ |
| 15 | +static void net_slirp_guest_error(const char *msg UNUSED, void *opaque UNUSED) |
| 16 | +{ |
| 17 | + // Unused |
| 18 | +} |
| 19 | + |
| 20 | +/* Slirp callback: returns current time in nanoseconds for Slirp timers */ |
| 21 | +static int64_t net_slirp_clock_get_ns(void *opaque UNUSED) |
| 22 | +{ |
| 23 | + net_user_options_t *usr = (net_user_options_t *) opaque; |
| 24 | + |
| 25 | + return semu_timer_get(&usr->timer->timer); |
| 26 | +} |
| 27 | + |
| 28 | +/* Slirp callback: called when Slirp has finished initialization */ |
| 29 | +static void net_slirp_init_completed(Slirp *slirp, void *opaque) |
| 30 | +{ |
| 31 | + net_user_options_t *s = opaque; |
| 32 | + s->slirp = slirp; |
| 33 | +} |
| 34 | + |
| 35 | +static void slirp_timer_init(slirp_timer *t, void (*cb)(void *opaque)) |
| 36 | +{ |
| 37 | + t->cb = cb; |
| 38 | + semu_timer_init(&t->timer, CLOCK_FREQ, 1); |
| 39 | +} |
| 40 | + |
| 41 | +static void net_slirp_timer_cb(void *opaque) |
| 42 | +{ |
| 43 | + slirp_timer *t = opaque; |
| 44 | + slirp_handle_timer(t->slirp, t->id, t->cb_opaque); |
| 45 | +} |
| 46 | + |
| 47 | +/* Slirp callback: allocated and initializes a new timer object */ |
| 48 | +static void *net_slirp_timer_new_opaque(SlirpTimerId id, |
| 49 | + void *cb_opaque, |
| 50 | + void *opaque) |
| 51 | +{ |
| 52 | + net_user_options_t *usr = (net_user_options_t *) opaque; |
| 53 | + slirp_timer *t = malloc(sizeof(slirp_timer)); |
| 54 | + usr->timer = t; |
| 55 | + t->slirp = usr->slirp; |
| 56 | + t->id = id; |
| 57 | + t->cb_opaque = cb_opaque; |
| 58 | + t->expire_timer_msec = -1; |
| 59 | + slirp_timer_init(t, net_slirp_timer_cb); |
| 60 | + |
| 61 | + return t; |
| 62 | +} |
| 63 | + |
| 64 | +/* Slirp callback: releases resources associated with a timer */ |
| 65 | +static void net_slirp_timer_free(void *timer, void *opaque UNUSED) |
| 66 | +{ |
| 67 | + if (timer) |
| 68 | + free(timer); |
| 69 | +} |
| 70 | + |
| 71 | +/* Slirp callback: modifies the expiration time of an existing timer */ |
| 72 | +static void net_slirp_timer_mod(void *timer, |
| 73 | + int64_t expire_time, |
| 74 | + void *opaque UNUSED) |
| 75 | +{ |
| 76 | + slirp_timer *t = (slirp_timer *) timer; |
| 77 | + semu_timer_rebase(&t->timer, expire_time); |
| 78 | +} |
| 79 | + |
| 80 | +/* Slirp callback: registers a pollable socket (unused in this backend) */ |
| 81 | +static void net_slirp_register_poll_sock(int fd UNUSED, void *opaque UNUSED) |
| 82 | +{ |
| 83 | + // Unused |
| 84 | +} |
| 85 | + |
| 86 | +/* Slirp callback: unregisters a pollable socket (unused in this backend) */ |
| 87 | +static void net_slirp_unregister_poll_sock(int fd UNUSED, void *opaque UNUSED) |
| 88 | +{ |
| 89 | + // Unused |
| 90 | +} |
| 91 | + |
| 92 | +/* Slirp callback: notifies backend of pending activity (unused) */ |
| 93 | +static void net_slirp_notify(void *opaque UNUSED) |
| 94 | +{ |
| 95 | + // Unused |
| 96 | +} |
| 97 | + |
| 98 | +static const SlirpCb slirp_cb = { |
| 99 | + .send_packet = net_slirp_send_packet, |
| 100 | + .guest_error = net_slirp_guest_error, |
| 101 | + .clock_get_ns = net_slirp_clock_get_ns, |
| 102 | + .init_completed = net_slirp_init_completed, |
| 103 | + .timer_new_opaque = net_slirp_timer_new_opaque, |
| 104 | + .timer_free = net_slirp_timer_free, |
| 105 | + .timer_mod = net_slirp_timer_mod, |
| 106 | + .register_poll_socket = net_slirp_register_poll_sock, |
| 107 | + .unregister_poll_socket = net_slirp_unregister_poll_sock, |
| 108 | + .notify = net_slirp_notify, |
| 109 | +}; |
| 110 | + |
| 111 | +static int poll_to_slirp_poll(int events) |
| 112 | +{ |
| 113 | + int ret = 0; |
| 114 | + if (events & POLLIN) |
| 115 | + ret |= SLIRP_POLL_IN; |
| 116 | + if (events & POLLOUT) |
| 117 | + ret |= SLIRP_POLL_OUT; |
| 118 | + if (events & POLLPRI) |
| 119 | + ret |= SLIRP_POLL_PRI; |
| 120 | + if (events & POLLERR) |
| 121 | + ret |= SLIRP_POLL_ERR; |
| 122 | + if (events & POLLHUP) |
| 123 | + ret |= SLIRP_POLL_HUP; |
| 124 | + return ret; |
| 125 | +} |
| 126 | + |
| 127 | +int semu_slirp_get_revents(int idx, void *opaque) |
| 128 | +{ |
| 129 | + net_user_options_t *usr = opaque; |
| 130 | + return poll_to_slirp_poll(usr->pfd[idx].revents); |
| 131 | +} |
| 132 | + |
| 133 | +int semu_slirp_add_poll_socket(slirp_os_socket fd, int events, void *opaque) |
| 134 | +{ |
| 135 | + net_user_options_t *usr = opaque; |
| 136 | + if (usr->pfd_len >= usr->pfd_size) { |
| 137 | + int newsize = usr->pfd_size + 16; |
| 138 | + struct pollfd *new = realloc(usr->pfd, newsize * sizeof(struct pollfd)); |
| 139 | + if (new) { |
| 140 | + usr->pfd = new; |
| 141 | + usr->pfd_size = newsize; |
| 142 | + } |
| 143 | + } |
| 144 | + if (usr->pfd_len < usr->pfd_size) { |
| 145 | + int idx = usr->pfd_len++; |
| 146 | + usr->pfd[idx].fd = fd; |
| 147 | + |
| 148 | + usr->pfd[idx].events = poll_to_slirp_poll(events); |
| 149 | + return idx; |
| 150 | + } else { |
| 151 | + return -1; |
| 152 | + } |
| 153 | +} |
| 154 | + |
| 155 | +Slirp *slirp_create(net_user_options_t *usr, SlirpConfig *cfg) |
| 156 | +{ |
| 157 | + /* Create a Slirp instance with special address. All |
| 158 | + * addresses of the form 10.0.2.xxx are special to |
| 159 | + * Slirp. |
| 160 | + */ |
| 161 | + cfg->version = SLIRP_CHECK_VERSION(4, 8, 0) ? 6 |
| 162 | + : SLIRP_CHECK_VERSION(4, 7, 0) ? 4 |
| 163 | + : 1; |
| 164 | + cfg->restricted = 0; |
| 165 | + cfg->in_enabled = 1; |
| 166 | + inet_pton(AF_INET, "10.0.2.0", &(cfg->vnetwork)); |
| 167 | + inet_pton(AF_INET, "255.255.255.0", &(cfg->vnetmask)); |
| 168 | + inet_pton(AF_INET, "10.0.2.2", &(cfg->vhost)); |
| 169 | + cfg->in6_enabled = 1; |
| 170 | + inet_pton(AF_INET6, "fd00::", &cfg->vprefix_addr6); |
| 171 | + cfg->vhostname = "slirp"; |
| 172 | + cfg->tftp_server_name = NULL; |
| 173 | + cfg->tftp_path = NULL; |
| 174 | + cfg->bootfile = NULL; |
| 175 | + inet_pton(AF_INET, "10.0.2.15", &(cfg->vdhcp_start)); |
| 176 | + inet_pton(AF_INET, "10.0.2.3", &(cfg->vnameserver)); |
| 177 | + inet_pton(AF_INET6, "fd00::3", &cfg->vnameserver6); |
| 178 | + cfg->vdnssearch = NULL; |
| 179 | + cfg->vdomainname = NULL; |
| 180 | + cfg->if_mtu = 1500; |
| 181 | + cfg->if_mru = 1500; |
| 182 | + cfg->outbound_addr = NULL; |
| 183 | + cfg->disable_host_loopback = 0; |
| 184 | + |
| 185 | + return slirp_new(cfg, &slirp_cb, usr); |
| 186 | +} |
| 187 | + |
| 188 | +int net_slirp_init(net_user_options_t *usr) |
| 189 | +{ |
| 190 | + SlirpConfig cfg; |
| 191 | + usr->slirp = slirp_create(usr, &cfg); |
| 192 | + if (usr->slirp == NULL) { |
| 193 | + fprintf(stderr, "create slirp failed\n"); |
| 194 | + } |
| 195 | + |
| 196 | + usr->pfd = malloc(sizeof(struct pollfd)); |
| 197 | + |
| 198 | + /* Register the read end of the internal pipe (channel[SLIRP_READ_SIDE]) |
| 199 | + * with slirp's poll system. This allows slirp to monitor it for incoming |
| 200 | + * data (POLL_IN) or hang-up event (POLL_HUP). |
| 201 | + */ |
| 202 | + semu_slirp_add_poll_socket(usr->channel[SLIRP_READ_SIDE], |
| 203 | + SLIRP_POLL_IN | SLIRP_POLL_HUP, usr); |
| 204 | + return 0; |
| 205 | +} |
0 commit comments