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slirp: Add IPv6 support to the TFTP code
Add the handler code for incoming TFTP packets to udp6_input(), and make sure that the TFTP code can send packets with both, udp_output() and udp6_output() by introducing a wrapper function called tftp_udp_output(). Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
This commit is contained in:
Thomas Huth
Samuel Thibault
parent
7aac531ef2
commit
fad7fb9ccd
133
slirp/tftp.c
133
slirp/tftp.c
@ -46,7 +46,8 @@ static void tftp_session_terminate(struct tftp_session *spt)
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spt->slirp = NULL;
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}
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static int tftp_session_allocate(Slirp *slirp, struct tftp_t *tp)
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static int tftp_session_allocate(Slirp *slirp, struct sockaddr_storage *srcsas,
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struct tftp_t *tp)
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{
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struct tftp_session *spt;
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int k;
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@ -68,7 +69,7 @@ static int tftp_session_allocate(Slirp *slirp, struct tftp_t *tp)
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found:
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memset(spt, 0, sizeof(*spt));
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memcpy(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip));
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spt->client_addr = *srcsas;
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spt->fd = -1;
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spt->client_port = tp->udp.uh_sport;
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spt->slirp = slirp;
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@ -78,7 +79,8 @@ static int tftp_session_allocate(Slirp *slirp, struct tftp_t *tp)
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return k;
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}
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static int tftp_session_find(Slirp *slirp, struct tftp_t *tp)
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static int tftp_session_find(Slirp *slirp, struct sockaddr_storage *srcsas,
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struct tftp_t *tp)
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{
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struct tftp_session *spt;
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int k;
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@ -87,7 +89,7 @@ static int tftp_session_find(Slirp *slirp, struct tftp_t *tp)
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spt = &slirp->tftp_sessions[k];
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if (tftp_session_in_use(spt)) {
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if (!memcmp(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip))) {
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if (sockaddr_equal(&spt->client_addr, srcsas)) {
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if (spt->client_port == tp->udp.uh_sport) {
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return k;
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}
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@ -120,11 +122,53 @@ static int tftp_read_data(struct tftp_session *spt, uint32_t block_nr,
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return bytes_read;
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}
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static struct tftp_t *tftp_prep_mbuf_data(struct tftp_session *spt,
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struct mbuf *m)
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{
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struct tftp_t *tp;
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memset(m->m_data, 0, m->m_size);
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m->m_data += IF_MAXLINKHDR;
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if (spt->client_addr.ss_family == AF_INET6) {
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m->m_data += sizeof(struct ip6);
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} else {
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m->m_data += sizeof(struct ip);
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}
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tp = (void *)m->m_data;
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m->m_data += sizeof(struct udphdr);
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return tp;
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}
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static void tftp_udp_output(struct tftp_session *spt, struct mbuf *m,
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struct tftp_t *recv_tp)
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{
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if (spt->client_addr.ss_family == AF_INET6) {
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struct sockaddr_in6 sa6, da6;
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sa6.sin6_addr = spt->slirp->vhost_addr6;
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sa6.sin6_port = recv_tp->udp.uh_dport;
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da6.sin6_addr = ((struct sockaddr_in6 *)&spt->client_addr)->sin6_addr;
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da6.sin6_port = spt->client_port;
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udp6_output(NULL, m, &sa6, &da6);
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} else {
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struct sockaddr_in sa4, da4;
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sa4.sin_addr = spt->slirp->vhost_addr;
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sa4.sin_port = recv_tp->udp.uh_dport;
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da4.sin_addr = ((struct sockaddr_in *)&spt->client_addr)->sin_addr;
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da4.sin_port = spt->client_port;
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udp_output(NULL, m, &sa4, &da4, IPTOS_LOWDELAY);
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}
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}
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static int tftp_send_oack(struct tftp_session *spt,
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const char *keys[], uint32_t values[], int nb,
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struct tftp_t *recv_tp)
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{
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struct sockaddr_in saddr, daddr;
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struct mbuf *m;
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struct tftp_t *tp;
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int i, n = 0;
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@ -132,13 +176,9 @@ static int tftp_send_oack(struct tftp_session *spt,
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m = m_get(spt->slirp);
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if (!m)
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return -1;
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return -1;
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memset(m->m_data, 0, m->m_size);
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m->m_data += IF_MAXLINKHDR;
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tp = (void *)m->m_data;
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m->m_data += sizeof(struct udpiphdr);
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tp = tftp_prep_mbuf_data(spt, m);
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tp->tp_op = htons(TFTP_OACK);
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for (i = 0; i < nb; i++) {
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@ -148,15 +188,8 @@ static int tftp_send_oack(struct tftp_session *spt,
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values[i]) + 1;
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}
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saddr.sin_addr = recv_tp->ip.ip_dst;
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saddr.sin_port = recv_tp->udp.uh_dport;
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daddr.sin_addr = spt->client_ip;
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daddr.sin_port = spt->client_port;
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m->m_len = sizeof(struct tftp_t) - 514 + n -
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sizeof(struct ip) - sizeof(struct udphdr);
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udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
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m->m_len = sizeof(struct tftp_t) - 514 + n - sizeof(struct udphdr);
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tftp_udp_output(spt, m, recv_tp);
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return 0;
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}
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@ -165,7 +198,6 @@ static void tftp_send_error(struct tftp_session *spt,
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uint16_t errorcode, const char *msg,
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struct tftp_t *recv_tp)
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{
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struct sockaddr_in saddr, daddr;
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struct mbuf *m;
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struct tftp_t *tp;
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@ -177,24 +209,15 @@ static void tftp_send_error(struct tftp_session *spt,
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memset(m->m_data, 0, m->m_size);
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m->m_data += IF_MAXLINKHDR;
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tp = (void *)m->m_data;
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m->m_data += sizeof(struct udpiphdr);
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tp = tftp_prep_mbuf_data(spt, m);
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tp->tp_op = htons(TFTP_ERROR);
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tp->x.tp_error.tp_error_code = htons(errorcode);
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pstrcpy((char *)tp->x.tp_error.tp_msg, sizeof(tp->x.tp_error.tp_msg), msg);
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saddr.sin_addr = recv_tp->ip.ip_dst;
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saddr.sin_port = recv_tp->udp.uh_dport;
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daddr.sin_addr = spt->client_ip;
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daddr.sin_port = spt->client_port;
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m->m_len = sizeof(struct tftp_t) - 514 + 3 + strlen(msg) -
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sizeof(struct ip) - sizeof(struct udphdr);
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udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
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m->m_len = sizeof(struct tftp_t) - 514 + 3 + strlen(msg)
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- sizeof(struct udphdr);
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tftp_udp_output(spt, m, recv_tp);
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out:
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tftp_session_terminate(spt);
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@ -203,7 +226,6 @@ out:
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static void tftp_send_next_block(struct tftp_session *spt,
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struct tftp_t *recv_tp)
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{
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struct sockaddr_in saddr, daddr;
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struct mbuf *m;
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struct tftp_t *tp;
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int nobytes;
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@ -216,19 +238,11 @@ static void tftp_send_next_block(struct tftp_session *spt,
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memset(m->m_data, 0, m->m_size);
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m->m_data += IF_MAXLINKHDR;
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tp = (void *)m->m_data;
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m->m_data += sizeof(struct udpiphdr);
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tp = tftp_prep_mbuf_data(spt, m);
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tp->tp_op = htons(TFTP_DATA);
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tp->x.tp_data.tp_block_nr = htons((spt->block_nr + 1) & 0xffff);
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saddr.sin_addr = recv_tp->ip.ip_dst;
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saddr.sin_port = recv_tp->udp.uh_dport;
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daddr.sin_addr = spt->client_ip;
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daddr.sin_port = spt->client_port;
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nobytes = tftp_read_data(spt, spt->block_nr, tp->x.tp_data.tp_buf, 512);
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if (nobytes < 0) {
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@ -241,10 +255,8 @@ static void tftp_send_next_block(struct tftp_session *spt,
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return;
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}
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m->m_len = sizeof(struct tftp_t) - (512 - nobytes) -
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sizeof(struct ip) - sizeof(struct udphdr);
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udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
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m->m_len = sizeof(struct tftp_t) - (512 - nobytes) - sizeof(struct udphdr);
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tftp_udp_output(spt, m, recv_tp);
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if (nobytes == 512) {
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tftp_session_update(spt);
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@ -256,7 +268,8 @@ static void tftp_send_next_block(struct tftp_session *spt,
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spt->block_nr++;
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}
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static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
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static void tftp_handle_rrq(Slirp *slirp, struct sockaddr_storage *srcsas,
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struct tftp_t *tp, int pktlen)
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{
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struct tftp_session *spt;
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int s, k;
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@ -267,12 +280,12 @@ static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
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int nb_options = 0;
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/* check if a session already exists and if so terminate it */
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s = tftp_session_find(slirp, tp);
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s = tftp_session_find(slirp, srcsas, tp);
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if (s >= 0) {
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tftp_session_terminate(&slirp->tftp_sessions[s]);
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}
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s = tftp_session_allocate(slirp, tp);
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s = tftp_session_allocate(slirp, srcsas, tp);
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if (s < 0) {
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return;
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@ -397,11 +410,12 @@ static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
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tftp_send_next_block(spt, tp);
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}
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static void tftp_handle_ack(Slirp *slirp, struct tftp_t *tp, int pktlen)
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static void tftp_handle_ack(Slirp *slirp, struct sockaddr_storage *srcsas,
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struct tftp_t *tp, int pktlen)
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{
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int s;
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s = tftp_session_find(slirp, tp);
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s = tftp_session_find(slirp, srcsas, tp);
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if (s < 0) {
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return;
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@ -410,11 +424,12 @@ static void tftp_handle_ack(Slirp *slirp, struct tftp_t *tp, int pktlen)
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tftp_send_next_block(&slirp->tftp_sessions[s], tp);
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}
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static void tftp_handle_error(Slirp *slirp, struct tftp_t *tp, int pktlen)
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static void tftp_handle_error(Slirp *slirp, struct sockaddr_storage *srcsas,
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struct tftp_t *tp, int pktlen)
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{
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int s;
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s = tftp_session_find(slirp, tp);
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s = tftp_session_find(slirp, srcsas, tp);
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if (s < 0) {
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return;
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@ -423,21 +438,21 @@ static void tftp_handle_error(Slirp *slirp, struct tftp_t *tp, int pktlen)
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tftp_session_terminate(&slirp->tftp_sessions[s]);
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}
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void tftp_input(struct mbuf *m)
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void tftp_input(struct sockaddr_storage *srcsas, struct mbuf *m)
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{
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struct tftp_t *tp = (struct tftp_t *)m->m_data;
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switch(ntohs(tp->tp_op)) {
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case TFTP_RRQ:
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tftp_handle_rrq(m->slirp, tp, m->m_len);
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tftp_handle_rrq(m->slirp, srcsas, tp, m->m_len);
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break;
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case TFTP_ACK:
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tftp_handle_ack(m->slirp, tp, m->m_len);
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tftp_handle_ack(m->slirp, srcsas, tp, m->m_len);
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break;
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case TFTP_ERROR:
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tftp_handle_error(m->slirp, tp, m->m_len);
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tftp_handle_error(m->slirp, srcsas, tp, m->m_len);
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break;
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}
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}
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@ -16,7 +16,6 @@
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#define TFTP_FILENAME_MAX 512
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struct tftp_t {
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struct ip ip;
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struct udphdr udp;
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uint16_t tp_op;
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union {
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@ -30,20 +29,20 @@ struct tftp_t {
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} tp_error;
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char tp_buf[512 + 2];
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} x;
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};
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} __attribute__((packed));
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struct tftp_session {
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Slirp *slirp;
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char *filename;
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int fd;
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struct in_addr client_ip;
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struct sockaddr_storage client_addr;
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uint16_t client_port;
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uint32_t block_nr;
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int timestamp;
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};
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void tftp_input(struct mbuf *m);
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void tftp_input(struct sockaddr_storage *srcsas, struct mbuf *m);
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#endif
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16
slirp/udp.c
16
slirp/udp.c
@ -128,6 +128,11 @@ udp_input(register struct mbuf *m, int iphlen)
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}
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}
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lhost.ss_family = AF_INET;
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lhost4 = (struct sockaddr_in *) &lhost;
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lhost4->sin_addr = ip->ip_src;
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lhost4->sin_port = uh->uh_sport;
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/*
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* handle DHCP/BOOTP
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*/
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@ -143,7 +148,11 @@ udp_input(register struct mbuf *m, int iphlen)
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*/
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if (ntohs(uh->uh_dport) == TFTP_SERVER &&
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ip->ip_dst.s_addr == slirp->vhost_addr.s_addr) {
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tftp_input(m);
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m->m_data += iphlen;
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m->m_len -= iphlen;
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tftp_input(&lhost, m);
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m->m_data -= iphlen;
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m->m_len += iphlen;
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goto bad;
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}
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@ -154,11 +163,6 @@ udp_input(register struct mbuf *m, int iphlen)
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/*
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* Locate pcb for datagram.
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*/
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lhost.ss_family = AF_INET;
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lhost4 = (struct sockaddr_in *) &lhost;
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lhost4->sin_addr = ip->ip_src;
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lhost4->sin_port = uh->uh_sport;
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so = solookup(&slirp->udp_last_so, &slirp->udb, &lhost, NULL);
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if (so == NULL) {
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16
slirp/udp6.c
16
slirp/udp6.c
@ -57,14 +57,24 @@ void udp6_input(struct mbuf *m)
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*/
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save_ip = *ip;
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/* TODO handle DHCP/BOOTP */
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/* TODO handle TFTP */
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/* Locate pcb for datagram. */
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lhost.sin6_family = AF_INET6;
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lhost.sin6_addr = ip->ip_src;
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lhost.sin6_port = uh->uh_sport;
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/* TODO handle DHCP/BOOTP */
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/* handle TFTP */
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if (ntohs(uh->uh_dport) == TFTP_SERVER &&
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!memcmp(ip->ip_dst.s6_addr, slirp->vhost_addr6.s6_addr, 16)) {
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m->m_data += iphlen;
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m->m_len -= iphlen;
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tftp_input((struct sockaddr_storage *)&lhost, m);
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m->m_data -= iphlen;
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m->m_len += iphlen;
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goto bad;
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}
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so = solookup(&slirp->udp_last_so, &slirp->udb,
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(struct sockaddr_storage *) &lhost, NULL);
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