/* SPDX-License-Identifier: MIT */ /* * libslirp * * Copyright (c) 2004-2008 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "slirp.h" #include "vmstate.h" #include "stream.h" #ifdef HAVE_VMSTATE static int slirp_tcp_post_load(void *opaque, int version) { tcp_template((struct tcpcb *)opaque); return 0; } static const VMStateDescription vmstate_slirp_tcp = { .name = "slirp-tcp", .version_id = 0, .post_load = slirp_tcp_post_load, .fields = (VMStateField[]){ VMSTATE_INT16(t_state, struct tcpcb), VMSTATE_INT16_ARRAY(t_timer, struct tcpcb, TCPT_NTIMERS), VMSTATE_INT16(t_rxtshift, struct tcpcb), VMSTATE_INT16(t_rxtcur, struct tcpcb), VMSTATE_INT16(t_dupacks, struct tcpcb), VMSTATE_UINT16(t_maxseg, struct tcpcb), VMSTATE_UINT8(t_force, struct tcpcb), VMSTATE_UINT16(t_flags, struct tcpcb), VMSTATE_UINT32(snd_una, struct tcpcb), VMSTATE_UINT32(snd_nxt, struct tcpcb), VMSTATE_UINT32(snd_up, struct tcpcb), VMSTATE_UINT32(snd_wl1, struct tcpcb), VMSTATE_UINT32(snd_wl2, struct tcpcb), VMSTATE_UINT32(iss, struct tcpcb), VMSTATE_UINT32(snd_wnd, struct tcpcb), VMSTATE_UINT32(rcv_wnd, struct tcpcb), VMSTATE_UINT32(rcv_nxt, struct tcpcb), VMSTATE_UINT32(rcv_up, struct tcpcb), VMSTATE_UINT32(irs, struct tcpcb), VMSTATE_UINT32(rcv_adv, struct tcpcb), VMSTATE_UINT32(snd_max, struct tcpcb), VMSTATE_UINT32(snd_cwnd, struct tcpcb), VMSTATE_UINT32(snd_ssthresh, struct tcpcb), VMSTATE_INT16(t_idle, struct tcpcb), VMSTATE_INT16(t_rtt, struct tcpcb), VMSTATE_UINT32(t_rtseq, struct tcpcb), VMSTATE_INT16(t_srtt, struct tcpcb), VMSTATE_INT16(t_rttvar, struct tcpcb), VMSTATE_UINT16(t_rttmin, struct tcpcb), VMSTATE_UINT32(max_sndwnd, struct tcpcb), VMSTATE_UINT8(t_oobflags, struct tcpcb), VMSTATE_UINT8(t_iobc, struct tcpcb), VMSTATE_INT16(t_softerror, struct tcpcb), VMSTATE_UINT8(snd_scale, struct tcpcb), VMSTATE_UINT8(rcv_scale, struct tcpcb), VMSTATE_UINT8(request_r_scale, struct tcpcb), VMSTATE_UINT8(requested_s_scale, struct tcpcb), VMSTATE_UINT32(ts_recent, struct tcpcb), VMSTATE_UINT32(ts_recent_age, struct tcpcb), VMSTATE_UINT32(last_ack_sent, struct tcpcb), VMSTATE_END_OF_LIST() } }; /* The sbuf has a pair of pointers that are migrated as offsets; * we calculate the offsets and restore the pointers using * pre_save/post_load on a tmp structure. */ struct sbuf_tmp { struct sbuf *parent; uint32_t roff, woff; }; static int sbuf_tmp_pre_save(void *opaque) { struct sbuf_tmp *tmp = opaque; tmp->woff = tmp->parent->sb_wptr - tmp->parent->sb_data; tmp->roff = tmp->parent->sb_rptr - tmp->parent->sb_data; return 0; } static int sbuf_tmp_post_load(void *opaque, int version) { struct sbuf_tmp *tmp = opaque; uint32_t requested_len = tmp->parent->sb_datalen; /* Allocate the buffer space used by the field after the tmp */ sbreserve(tmp->parent, tmp->parent->sb_datalen); if (tmp->woff >= requested_len || tmp->roff >= requested_len) { g_critical("invalid sbuf offsets r/w=%u/%u len=%u", tmp->roff, tmp->woff, requested_len); return -EINVAL; } tmp->parent->sb_wptr = tmp->parent->sb_data + tmp->woff; tmp->parent->sb_rptr = tmp->parent->sb_data + tmp->roff; return 0; } static const VMStateDescription vmstate_slirp_sbuf_tmp = { .name = "slirp-sbuf-tmp", .post_load = sbuf_tmp_post_load, .pre_save = sbuf_tmp_pre_save, .version_id = 0, .fields = (VMStateField[]){ VMSTATE_UINT32(woff, struct sbuf_tmp), VMSTATE_UINT32(roff, struct sbuf_tmp), VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_slirp_sbuf = { .name = "slirp-sbuf", .version_id = 0, .fields = (VMStateField[]){ VMSTATE_UINT32(sb_cc, struct sbuf), VMSTATE_UINT32(sb_datalen, struct sbuf), VMSTATE_WITH_TMP(struct sbuf, struct sbuf_tmp, vmstate_slirp_sbuf_tmp), VMSTATE_VBUFFER_UINT32(sb_data, struct sbuf, 0, NULL, sb_datalen), VMSTATE_END_OF_LIST() } }; static bool slirp_older_than_v4(void *opaque, int version_id) { return version_id < 4; } static bool slirp_family_inet(void *opaque, int version_id) { union slirp_sockaddr *ssa = (union slirp_sockaddr *)opaque; return ssa->ss.ss_family == AF_INET; } static int slirp_socket_pre_load(void *opaque) { struct socket *so = opaque; tcp_attach(so); /* Older versions don't load these fields */ so->so_ffamily = AF_INET; so->so_lfamily = AF_INET; return 0; } #ifndef _WIN32 #define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_UINT32_TEST(f, s, t) #else /* Win uses u_long rather than uint32_t - but it's still 32bits long */ #define VMSTATE_SIN4_ADDR(f, s, t) \ VMSTATE_SINGLE_TEST(f, s, t, 0, slirp_vmstate_info_uint32, u_long) #endif /* The OS provided ss_family field isn't that portable; it's size * and type varies (16/8 bit, signed, unsigned) * and the values it contains aren't fully portable. */ typedef struct SS_FamilyTmpStruct { union slirp_sockaddr *parent; uint16_t portable_family; } SS_FamilyTmpStruct; #define SS_FAMILY_MIG_IPV4 2 /* Linux, BSD, Win... */ #define SS_FAMILY_MIG_IPV6 10 /* Linux */ #define SS_FAMILY_MIG_OTHER 0xffff static int ss_family_pre_save(void *opaque) { SS_FamilyTmpStruct *tss = opaque; tss->portable_family = SS_FAMILY_MIG_OTHER; if (tss->parent->ss.ss_family == AF_INET) { tss->portable_family = SS_FAMILY_MIG_IPV4; } else if (tss->parent->ss.ss_family == AF_INET6) { tss->portable_family = SS_FAMILY_MIG_IPV6; } return 0; } static int ss_family_post_load(void *opaque, int version_id) { SS_FamilyTmpStruct *tss = opaque; switch (tss->portable_family) { case SS_FAMILY_MIG_IPV4: tss->parent->ss.ss_family = AF_INET; break; case SS_FAMILY_MIG_IPV6: case 23: /* compatibility: AF_INET6 from mingw */ case 28: /* compatibility: AF_INET6 from FreeBSD sys/socket.h */ tss->parent->ss.ss_family = AF_INET6; break; default: g_critical("invalid ss_family type %x", tss->portable_family); return -EINVAL; } return 0; } static const VMStateDescription vmstate_slirp_ss_family = { .name = "slirp-socket-addr/ss_family", .pre_save = ss_family_pre_save, .post_load = ss_family_post_load, .fields = (VMStateField[]){ VMSTATE_UINT16(portable_family, SS_FamilyTmpStruct), VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_slirp_socket_addr = { .name = "slirp-socket-addr", .version_id = 4, .fields = (VMStateField[]){ VMSTATE_WITH_TMP(union slirp_sockaddr, SS_FamilyTmpStruct, vmstate_slirp_ss_family), VMSTATE_SIN4_ADDR(sin.sin_addr.s_addr, union slirp_sockaddr, slirp_family_inet), VMSTATE_UINT16_TEST(sin.sin_port, union slirp_sockaddr, slirp_family_inet), #if 0 /* Untested: Needs checking by someone with IPv6 test */ VMSTATE_BUFFER_TEST(sin6.sin6_addr, union slirp_sockaddr, slirp_family_inet6), VMSTATE_UINT16_TEST(sin6.sin6_port, union slirp_sockaddr, slirp_family_inet6), VMSTATE_UINT32_TEST(sin6.sin6_flowinfo, union slirp_sockaddr, slirp_family_inet6), VMSTATE_UINT32_TEST(sin6.sin6_scope_id, union slirp_sockaddr, slirp_family_inet6), #endif VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_slirp_socket = { .name = "slirp-socket", .version_id = 4, .pre_load = slirp_socket_pre_load, .fields = (VMStateField[]){ VMSTATE_UINT32(so_urgc, struct socket), /* Pre-v4 versions */ VMSTATE_SIN4_ADDR(so_faddr.s_addr, struct socket, slirp_older_than_v4), VMSTATE_SIN4_ADDR(so_laddr.s_addr, struct socket, slirp_older_than_v4), VMSTATE_UINT16_TEST(so_fport, struct socket, slirp_older_than_v4), VMSTATE_UINT16_TEST(so_lport, struct socket, slirp_older_than_v4), /* v4 and newer */ VMSTATE_STRUCT(fhost, struct socket, 4, vmstate_slirp_socket_addr, union slirp_sockaddr), VMSTATE_STRUCT(lhost, struct socket, 4, vmstate_slirp_socket_addr, union slirp_sockaddr), VMSTATE_UINT8(so_iptos, struct socket), VMSTATE_UINT8(so_emu, struct socket), VMSTATE_UINT8(so_type, struct socket), VMSTATE_INT32(so_state, struct socket), VMSTATE_STRUCT(so_rcv, struct socket, 0, vmstate_slirp_sbuf, struct sbuf), VMSTATE_STRUCT(so_snd, struct socket, 0, vmstate_slirp_sbuf, struct sbuf), VMSTATE_STRUCT_POINTER(so_tcpcb, struct socket, vmstate_slirp_tcp, struct tcpcb), VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_slirp_bootp_client = { .name = "slirp_bootpclient", .fields = (VMStateField[]){ VMSTATE_UINT16(allocated, BOOTPClient), VMSTATE_BUFFER(macaddr, BOOTPClient), VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_slirp = { .name = "slirp", .version_id = 4, .fields = (VMStateField[]){ VMSTATE_UINT16_V(ip_id, Slirp, 2), VMSTATE_STRUCT_ARRAY( bootp_clients, Slirp, NB_BOOTP_CLIENTS, 3, vmstate_slirp_bootp_client, BOOTPClient), VMSTATE_END_OF_LIST() } }; void slirp_state_save(Slirp *slirp, SlirpWriteCb write_cb, void *opaque) { struct gfwd_list *ex_ptr; SlirpOStream f = { .write_cb = write_cb, .opaque = opaque, }; for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) if (ex_ptr->write_cb) { struct socket *so; so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr, ntohs(ex_ptr->ex_fport)); if (!so) { continue; } slirp_ostream_write_u8(&f, 42); slirp_vmstate_save_state(&f, &vmstate_slirp_socket, so); } slirp_ostream_write_u8(&f, 0); slirp_vmstate_save_state(&f, &vmstate_slirp, slirp); } int slirp_state_load(Slirp *slirp, int version_id, SlirpReadCb read_cb, void *opaque) { struct gfwd_list *ex_ptr; SlirpIStream f = { .read_cb = read_cb, .opaque = opaque, }; while (slirp_istream_read_u8(&f)) { int ret; struct socket *so = socreate(slirp, -1); ret = slirp_vmstate_load_state(&f, &vmstate_slirp_socket, so, version_id); if (ret < 0) { return ret; } if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) != slirp->vnetwork_addr.s_addr) { return -EINVAL; } for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { if (ex_ptr->write_cb && so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr && so->so_fport == ex_ptr->ex_fport) { break; } } if (!ex_ptr) { return -EINVAL; } so->guestfwd = ex_ptr; } return slirp_vmstate_load_state(&f, &vmstate_slirp, slirp, version_id); } int slirp_state_version(void) { return 4; } #endif /* HAVE_VMSTATE */