268c95d771
Make state saving optional: this will allow to build SLIRP without QEMU. (eventually, the vmstate helpers will be extracted, so an external project & process could save its state) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
395 lines
13 KiB
C
395 lines
13 KiB
C
/*
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* libslirp
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*
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* Copyright (c) 2004-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "slirp.h"
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#include "state.h"
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#include "migration/vmstate.h"
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#include "migration/qemu-file-types.h"
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#include "migration/register.h"
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static int slirp_tcp_post_load(void *opaque, int version)
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{
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tcp_template((struct tcpcb *)opaque);
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return 0;
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}
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static const VMStateDescription vmstate_slirp_tcp = {
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.name = "slirp-tcp",
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.version_id = 0,
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.post_load = slirp_tcp_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_INT16(t_state, struct tcpcb),
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VMSTATE_INT16_ARRAY(t_timer, struct tcpcb, TCPT_NTIMERS),
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VMSTATE_INT16(t_rxtshift, struct tcpcb),
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VMSTATE_INT16(t_rxtcur, struct tcpcb),
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VMSTATE_INT16(t_dupacks, struct tcpcb),
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VMSTATE_UINT16(t_maxseg, struct tcpcb),
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VMSTATE_UINT8(t_force, struct tcpcb),
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VMSTATE_UINT16(t_flags, struct tcpcb),
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VMSTATE_UINT32(snd_una, struct tcpcb),
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VMSTATE_UINT32(snd_nxt, struct tcpcb),
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VMSTATE_UINT32(snd_up, struct tcpcb),
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VMSTATE_UINT32(snd_wl1, struct tcpcb),
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VMSTATE_UINT32(snd_wl2, struct tcpcb),
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VMSTATE_UINT32(iss, struct tcpcb),
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VMSTATE_UINT32(snd_wnd, struct tcpcb),
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VMSTATE_UINT32(rcv_wnd, struct tcpcb),
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VMSTATE_UINT32(rcv_nxt, struct tcpcb),
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VMSTATE_UINT32(rcv_up, struct tcpcb),
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VMSTATE_UINT32(irs, struct tcpcb),
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VMSTATE_UINT32(rcv_adv, struct tcpcb),
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VMSTATE_UINT32(snd_max, struct tcpcb),
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VMSTATE_UINT32(snd_cwnd, struct tcpcb),
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VMSTATE_UINT32(snd_ssthresh, struct tcpcb),
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VMSTATE_INT16(t_idle, struct tcpcb),
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VMSTATE_INT16(t_rtt, struct tcpcb),
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VMSTATE_UINT32(t_rtseq, struct tcpcb),
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VMSTATE_INT16(t_srtt, struct tcpcb),
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VMSTATE_INT16(t_rttvar, struct tcpcb),
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VMSTATE_UINT16(t_rttmin, struct tcpcb),
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VMSTATE_UINT32(max_sndwnd, struct tcpcb),
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VMSTATE_UINT8(t_oobflags, struct tcpcb),
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VMSTATE_UINT8(t_iobc, struct tcpcb),
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VMSTATE_INT16(t_softerror, struct tcpcb),
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VMSTATE_UINT8(snd_scale, struct tcpcb),
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VMSTATE_UINT8(rcv_scale, struct tcpcb),
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VMSTATE_UINT8(request_r_scale, struct tcpcb),
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VMSTATE_UINT8(requested_s_scale, struct tcpcb),
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VMSTATE_UINT32(ts_recent, struct tcpcb),
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VMSTATE_UINT32(ts_recent_age, struct tcpcb),
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VMSTATE_UINT32(last_ack_sent, struct tcpcb),
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VMSTATE_END_OF_LIST()
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}
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};
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/* The sbuf has a pair of pointers that are migrated as offsets;
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* we calculate the offsets and restore the pointers using
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* pre_save/post_load on a tmp structure.
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*/
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struct sbuf_tmp {
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struct sbuf *parent;
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uint32_t roff, woff;
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};
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static int sbuf_tmp_pre_save(void *opaque)
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{
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struct sbuf_tmp *tmp = opaque;
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tmp->woff = tmp->parent->sb_wptr - tmp->parent->sb_data;
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tmp->roff = tmp->parent->sb_rptr - tmp->parent->sb_data;
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return 0;
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}
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static int sbuf_tmp_post_load(void *opaque, int version)
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{
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struct sbuf_tmp *tmp = opaque;
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uint32_t requested_len = tmp->parent->sb_datalen;
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/* Allocate the buffer space used by the field after the tmp */
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sbreserve(tmp->parent, tmp->parent->sb_datalen);
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if (tmp->parent->sb_datalen != requested_len) {
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return -ENOMEM;
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}
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if (tmp->woff >= requested_len ||
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tmp->roff >= requested_len) {
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g_critical("invalid sbuf offsets r/w=%u/%u len=%u",
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tmp->roff, tmp->woff, requested_len);
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return -EINVAL;
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}
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tmp->parent->sb_wptr = tmp->parent->sb_data + tmp->woff;
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tmp->parent->sb_rptr = tmp->parent->sb_data + tmp->roff;
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return 0;
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}
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static const VMStateDescription vmstate_slirp_sbuf_tmp = {
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.name = "slirp-sbuf-tmp",
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.post_load = sbuf_tmp_post_load,
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.pre_save = sbuf_tmp_pre_save,
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.version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(woff, struct sbuf_tmp),
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VMSTATE_UINT32(roff, struct sbuf_tmp),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_slirp_sbuf = {
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.name = "slirp-sbuf",
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.version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(sb_cc, struct sbuf),
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VMSTATE_UINT32(sb_datalen, struct sbuf),
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VMSTATE_WITH_TMP(struct sbuf, struct sbuf_tmp, vmstate_slirp_sbuf_tmp),
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VMSTATE_VBUFFER_UINT32(sb_data, struct sbuf, 0, NULL, sb_datalen),
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VMSTATE_END_OF_LIST()
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}
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};
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static bool slirp_older_than_v4(void *opaque, int version_id)
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{
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return version_id < 4;
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}
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static bool slirp_family_inet(void *opaque, int version_id)
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{
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union slirp_sockaddr *ssa = (union slirp_sockaddr *)opaque;
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return ssa->ss.ss_family == AF_INET;
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}
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static int slirp_socket_pre_load(void *opaque)
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{
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struct socket *so = opaque;
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if (tcp_attach(so) < 0) {
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return -ENOMEM;
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}
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/* Older versions don't load these fields */
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so->so_ffamily = AF_INET;
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so->so_lfamily = AF_INET;
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return 0;
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}
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#ifndef _WIN32
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#define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_UINT32_TEST(f, s, t)
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#else
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/* Win uses u_long rather than uint32_t - but it's still 32bits long */
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#define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_SINGLE_TEST(f, s, t, 0, \
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vmstate_info_uint32, u_long)
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#endif
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/* The OS provided ss_family field isn't that portable; it's size
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* and type varies (16/8 bit, signed, unsigned)
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* and the values it contains aren't fully portable.
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*/
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typedef struct SS_FamilyTmpStruct {
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union slirp_sockaddr *parent;
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uint16_t portable_family;
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} SS_FamilyTmpStruct;
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#define SS_FAMILY_MIG_IPV4 2 /* Linux, BSD, Win... */
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#define SS_FAMILY_MIG_IPV6 10 /* Linux */
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#define SS_FAMILY_MIG_OTHER 0xffff
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static int ss_family_pre_save(void *opaque)
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{
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SS_FamilyTmpStruct *tss = opaque;
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tss->portable_family = SS_FAMILY_MIG_OTHER;
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if (tss->parent->ss.ss_family == AF_INET) {
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tss->portable_family = SS_FAMILY_MIG_IPV4;
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} else if (tss->parent->ss.ss_family == AF_INET6) {
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tss->portable_family = SS_FAMILY_MIG_IPV6;
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}
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return 0;
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}
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static int ss_family_post_load(void *opaque, int version_id)
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{
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SS_FamilyTmpStruct *tss = opaque;
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switch (tss->portable_family) {
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case SS_FAMILY_MIG_IPV4:
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tss->parent->ss.ss_family = AF_INET;
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break;
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case SS_FAMILY_MIG_IPV6:
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case 23: /* compatibility: AF_INET6 from mingw */
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case 28: /* compatibility: AF_INET6 from FreeBSD sys/socket.h */
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tss->parent->ss.ss_family = AF_INET6;
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break;
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default:
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g_critical("invalid ss_family type %x", tss->portable_family);
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return -EINVAL;
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}
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return 0;
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}
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static const VMStateDescription vmstate_slirp_ss_family = {
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.name = "slirp-socket-addr/ss_family",
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.pre_save = ss_family_pre_save,
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.post_load = ss_family_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_UINT16(portable_family, SS_FamilyTmpStruct),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_slirp_socket_addr = {
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.name = "slirp-socket-addr",
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.version_id = 4,
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.fields = (VMStateField[]) {
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VMSTATE_WITH_TMP(union slirp_sockaddr, SS_FamilyTmpStruct,
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vmstate_slirp_ss_family),
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VMSTATE_SIN4_ADDR(sin.sin_addr.s_addr, union slirp_sockaddr,
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slirp_family_inet),
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VMSTATE_UINT16_TEST(sin.sin_port, union slirp_sockaddr,
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slirp_family_inet),
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#if 0
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/* Untested: Needs checking by someone with IPv6 test */
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VMSTATE_BUFFER_TEST(sin6.sin6_addr, union slirp_sockaddr,
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slirp_family_inet6),
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VMSTATE_UINT16_TEST(sin6.sin6_port, union slirp_sockaddr,
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slirp_family_inet6),
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VMSTATE_UINT32_TEST(sin6.sin6_flowinfo, union slirp_sockaddr,
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slirp_family_inet6),
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VMSTATE_UINT32_TEST(sin6.sin6_scope_id, union slirp_sockaddr,
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slirp_family_inet6),
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#endif
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_slirp_socket = {
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.name = "slirp-socket",
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.version_id = 4,
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.pre_load = slirp_socket_pre_load,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(so_urgc, struct socket),
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/* Pre-v4 versions */
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VMSTATE_SIN4_ADDR(so_faddr.s_addr, struct socket,
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slirp_older_than_v4),
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VMSTATE_SIN4_ADDR(so_laddr.s_addr, struct socket,
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slirp_older_than_v4),
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VMSTATE_UINT16_TEST(so_fport, struct socket, slirp_older_than_v4),
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VMSTATE_UINT16_TEST(so_lport, struct socket, slirp_older_than_v4),
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/* v4 and newer */
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VMSTATE_STRUCT(fhost, struct socket, 4, vmstate_slirp_socket_addr,
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union slirp_sockaddr),
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VMSTATE_STRUCT(lhost, struct socket, 4, vmstate_slirp_socket_addr,
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union slirp_sockaddr),
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VMSTATE_UINT8(so_iptos, struct socket),
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VMSTATE_UINT8(so_emu, struct socket),
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VMSTATE_UINT8(so_type, struct socket),
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VMSTATE_INT32(so_state, struct socket),
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VMSTATE_STRUCT(so_rcv, struct socket, 0, vmstate_slirp_sbuf,
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struct sbuf),
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VMSTATE_STRUCT(so_snd, struct socket, 0, vmstate_slirp_sbuf,
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struct sbuf),
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VMSTATE_STRUCT_POINTER(so_tcpcb, struct socket, vmstate_slirp_tcp,
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struct tcpcb),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_slirp_bootp_client = {
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.name = "slirp_bootpclient",
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.fields = (VMStateField[]) {
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VMSTATE_UINT16(allocated, BOOTPClient),
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VMSTATE_BUFFER(macaddr, BOOTPClient),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription vmstate_slirp = {
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.name = "slirp",
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.version_id = 4,
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.fields = (VMStateField[]) {
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VMSTATE_UINT16_V(ip_id, Slirp, 2),
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VMSTATE_STRUCT_ARRAY(bootp_clients, Slirp, NB_BOOTP_CLIENTS, 3,
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vmstate_slirp_bootp_client, BOOTPClient),
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VMSTATE_END_OF_LIST()
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}
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};
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static void slirp_state_save(QEMUFile *f, void *opaque)
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{
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Slirp *slirp = opaque;
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struct gfwd_list *ex_ptr;
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for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
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if (ex_ptr->write_cb) {
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struct socket *so;
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so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr,
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ntohs(ex_ptr->ex_fport));
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if (!so) {
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continue;
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}
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qemu_put_byte(f, 42);
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vmstate_save_state(f, &vmstate_slirp_socket, so, NULL);
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}
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qemu_put_byte(f, 0);
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vmstate_save_state(f, &vmstate_slirp, slirp, NULL);
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}
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static int slirp_state_load(QEMUFile *f, void *opaque, int version_id)
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{
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Slirp *slirp = opaque;
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struct gfwd_list *ex_ptr;
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while (qemu_get_byte(f)) {
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int ret;
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struct socket *so = socreate(slirp);
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ret = vmstate_load_state(f, &vmstate_slirp_socket, so, version_id);
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if (ret < 0) {
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return ret;
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}
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if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) !=
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slirp->vnetwork_addr.s_addr) {
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return -EINVAL;
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}
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for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
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if (ex_ptr->write_cb &&
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so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr &&
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so->so_fport == ex_ptr->ex_fport) {
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break;
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}
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}
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if (!ex_ptr) {
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return -EINVAL;
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}
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}
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return vmstate_load_state(f, &vmstate_slirp, slirp, version_id);
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}
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void slirp_state_register(Slirp *slirp)
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{
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static SaveVMHandlers savevm_slirp_state = {
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.save_state = slirp_state_save,
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.load_state = slirp_state_load,
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};
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register_savevm_live(NULL, "slirp", 0, 4, &savevm_slirp_state, slirp);
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}
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void slirp_state_unregister(Slirp *slirp)
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{
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unregister_savevm(NULL, "slirp", slirp);
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}
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