mirror of
https://github.com/lwip-tcpip/lwip.git
synced 2024-12-25 18:14:53 +00:00
Rebinding an active pcb did not check the given address/port against other bound pcb's.
This commit is contained in:
likewise
parent
0e4d59541a
commit
4a720425b7
189
src/core/udp.c
189
src/core/udp.c
@ -28,7 +28,7 @@
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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* $Id: udp.c,v 1.14 2003/01/27 12:35:16 likewise Exp $
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* $Id: udp.c,v 1.15 2003/01/27 13:58:45 likewise Exp $
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*/
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/*-----------------------------------------------------------------------------------*/
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@ -91,24 +91,25 @@ udp_lookup(struct ip_hdr *iphdr, struct netif *inp)
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struct udp_pcb *pcb;
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struct udp_hdr *udphdr;
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u16_t src, dest;
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PERF_START;
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udphdr = (struct udp_hdr *)(u8_t *)iphdr + IPH_HL(iphdr) * 4;
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PERF_START;
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udphdr = (struct udp_hdr *)(u8_t *)iphdr + IPH_HL(iphdr) * 4;
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src = NTOHS(udphdr->src);
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dest = NTOHS(udphdr->dest);
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pcb = pcb_cache;
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pcb = pcb_cache;
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if(pcb != NULL &&
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pcb->remote_port == src &&
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pcb->local_port == dest &&
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(ip_addr_isany(&pcb->remote_ip) ||
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ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src))) &&
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(ip_addr_isany(&pcb->local_ip) ||
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ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
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pcb->remote_port == src &&
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pcb->local_port == dest &&
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(ip_addr_isany(&pcb->remote_ip) ||
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ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src))) &&
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(ip_addr_isany(&pcb->local_ip) ||
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ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
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return 1;
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} else {
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}
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else {
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for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
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if(pcb->remote_port == src &&
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pcb->local_port == dest &&
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@ -117,8 +118,8 @@ udp_lookup(struct ip_hdr *iphdr, struct netif *inp)
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(ip_addr_isany(&pcb->local_ip) ||
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ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
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pcb_cache = pcb;
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break;
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}
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break;
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}
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}
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if(pcb == NULL) {
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@ -130,21 +131,32 @@ udp_lookup(struct ip_hdr *iphdr, struct netif *inp)
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(ip_addr_isany(&pcb->local_ip) ||
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ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {
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break;
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}
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}
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}
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}
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}
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PERF_STOP("udp_lookup");
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if(pcb != NULL) {
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return 1;
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} else {
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}
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else {
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return 1;
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}
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}
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#endif /* LWIP_DEBUG */
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/*-----------------------------------------------------------------------------------*/
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/**
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* Process an incoming UDP datagram.
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*
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* Given an incoming UDP datagram (as a chain of pbufs) this function
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* finds a corresponding UDP PCB and
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*
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* @param pbuf pbuf to be demultiplexed to a UDP PCB.
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* @param netif network interface on which the datagram was received.
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*
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* @see udp_disconnect()
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*/
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void
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udp_input(struct pbuf *p, struct netif *inp)
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{
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@ -299,7 +311,20 @@ udp_input(struct pbuf *p, struct netif *inp)
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PERF_STOP("udp_input");
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Send data using UDP.
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*
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* @param pcb UDP PCB used to send the data.
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* @param pbuf chain of pbuf's to be sent.
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*
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* @return lwIP error code.
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* - ERR_OK. Successful. No error occured.
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* - ERR_MEM. Out of memory.
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* - ERR_USE. The specified ipaddr and port are already bound to by
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* another UDP PCB.
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*
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* @see udp_disconnect()
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*/
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err_t
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udp_send(struct udp_pcb *pcb, struct pbuf *p)
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{
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@ -309,18 +334,22 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
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err_t err;
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struct pbuf *hdr;
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DEBUGF(UDP_DEBUG, ("udp_send"));
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/* hdr will point to the UDP header pbuf if an extra header pbuf has
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to be allocated. */
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hdr = NULL;
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/* succeeding in adding an UDP header to first given pbuf in chain? */
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if(pbuf_header(p, UDP_HLEN)) {
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/* allocate header in new pbuf */
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hdr = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
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/* new header pbuf could not be allocated? */
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if(hdr == NULL) {
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return ERR_MEM;
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}
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/* chain header in front of given pbuf */
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pbuf_chain(hdr, p);
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/* have p point to header pbuf */
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p = hdr;
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}
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DEBUGF(UDP_DEBUG, ("udp_send: got pbuf"));
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@ -337,15 +366,18 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
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#endif /* UDP_STATS */
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return ERR_RTE;
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}
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/* using IP_ANY_ADDR? */
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if(ip_addr_isany(&pcb->local_ip)) {
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/* use network interface IP address as source address */
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src_ip = &(netif->ip_addr);
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} else {
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/* use UDP PCB local IP address as source address */
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src_ip = &(pcb->local_ip);
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}
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DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %d\n", p->tot_len));
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/* UDP Lite protocol? */
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if(pcb->flags & UDP_FLAGS_UDPLITE) {
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DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %u", p->tot_len));
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/* set UDP message length in UDP header */
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@ -353,9 +385,9 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
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/* calculate checksum */
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udphdr->chksum = inet_chksum_pseudo(p, src_ip, &(pcb->remote_ip),
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IP_PROTO_UDP, pcb->chksum_len);
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if(udphdr->chksum == 0x0000) {
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udphdr->chksum = 0xffff;
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}
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/* chksum zero must become 0xffff, as zero means 'no checksum' */
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if(udphdr->chksum == 0x0000) udphdr->chksum = 0xffff;
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/* output to IP */
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err = ip_output_if(p, src_ip, &pcb->remote_ip, UDP_TTL, IP_PROTO_UDPLITE, netif);
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#if LWIP_SNMP > 0
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snmp_inc_udpoutdatagrams();
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@ -365,20 +397,19 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
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udphdr->len = htons(p->tot_len);
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/* calculate checksum */
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if((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
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udphdr->chksum = inet_chksum_pseudo(p, src_ip, &pcb->remote_ip,
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IP_PROTO_UDP, p->tot_len);
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if(udphdr->chksum == 0x0000) {
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udphdr->chksum = 0xffff;
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}
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udphdr->chksum = inet_chksum_pseudo(p, src_ip, &pcb->remote_ip, IP_PROTO_UDP, p->tot_len);
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/* chksum zero must become 0xffff, as zero means 'no checksum' */
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if(udphdr->chksum == 0x0000) udphdr->chksum = 0xffff;
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}
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DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum %x", udphdr->chksum));
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#if LWIP_SNMP > 0
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snmp_inc_udpoutdatagrams();
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#endif
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DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if(,,,,IP_PROTO_UDP,)"));
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/* output to IP */
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err = ip_output_if(p, src_ip, &pcb->remote_ip, UDP_TTL, IP_PROTO_UDP, netif);
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}
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/* dechain and free the header pbuf */
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if(hdr != NULL) {
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pbuf_dechain(hdr);
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pbuf_free(hdr);
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@ -389,32 +420,47 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
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#endif /* UDP_STATS */
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return err;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Bind an UDP PCB.
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*
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* @param pcb UDP PCB to be bound with a local address ipaddr and port.
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* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
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* bind to all local interfaces.
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* @param port local UDP port to bind with.
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*
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* @return lwIP error code.
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* - ERR_OK. Successful. No error occured.
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* - ERR_USE. The specified ipaddr and port are already bound to by
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* another UDP PCB.
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*
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* @see udp_disconnect()
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*/
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err_t
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udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port)
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{
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struct udp_pcb *ipcb;
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u8_t rebind = 0;
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/* Check for double bind and rebind of the same pcb */
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for(ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
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/* is this UDP PCB already on active list? */
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if (pcb == ipcb) {
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rebind = 1;
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break;
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} else
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if (ipcb->local_port == port) {
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if(ip_addr_isany(&(ipcb->local_ip)) ||
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ip_addr_isany(ipaddr) ||
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ip_addr_cmp(&(ipcb->local_ip), ipaddr)) {
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/* Port/IP pair already bound */
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return ERR_USE;
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}
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rebind = 1;
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}
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/* port matches that of PCB in list? */
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if ((ipcb->local_port == port) &&
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/* IP address matches, or one is IP_ADDR_ANY? */
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(ip_addr_isany(&(ipcb->local_ip)) ||
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ip_addr_isany(ipaddr) ||
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ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
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/* other PCB already binds to this local IP and port */
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return ERR_USE;
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}
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}
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/* bind local address */
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ip_addr_set(&pcb->local_ip, ipaddr);
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pcb->local_port = port;
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/* We need to place the PCB on the list if not already there. */
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if (rebind == 0) {
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pcb->next = udp_pcbs;
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@ -424,7 +470,17 @@ udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port)
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DEBUGF(UDP_DEBUG, ("udp_bind: bound to port %d\n", port));
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return ERR_OK;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Connect an UDP PCB.
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*
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* @param pcb UDP PCB to be connected with remote address ipaddr and port.
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* @param ipaddr remote IP address to connect with.
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* @param port remote UDP port to connect with.
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*
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* @return lwIP error code
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*
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* @see udp_disconnect()
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*/
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err_t
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udp_connect(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port)
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{
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@ -436,11 +492,11 @@ udp_connect(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port)
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/* Insert UDP PCB into the list of active UDP PCBs. */
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for(ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
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if(pcb == ipcb) {
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/* Already on the list, just return. */
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/* already on the list, just return */
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return ERR_OK;
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}
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}
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/* We need to place the PCB on the list. */
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/* PCB not yet on the list, add PCB now */
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pcb->next = udp_pcbs;
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udp_pcbs = pcb;
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return ERR_OK;
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@ -458,37 +514,54 @@ udp_recv(struct udp_pcb *pcb,
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struct ip_addr *addr, u16_t port),
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void *recv_arg)
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{
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/* remember recv() callback and user data */
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pcb->recv = recv;
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pcb->recv_arg = recv_arg;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Remove an UDP PCB.
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*
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* @param pcb UDP PCB to be removed. The PCB is removed from the list of
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* UDP PCB's and the data structure is freed from memory.
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*
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* @see udp_new()
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*/
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void
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udp_remove(struct udp_pcb *pcb)
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{
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struct udp_pcb *pcb2;
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if(udp_pcbs == pcb) {
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/* pcb to be removed is first in list? */
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if (udp_pcbs == pcb) {
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/* make list start at 2nd pcb */
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udp_pcbs = udp_pcbs->next;
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/* pcb not 1st in list */
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} else for(pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
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/* find pcb in udp_pcbs list */
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if(pcb2->next != NULL && pcb2->next == pcb) {
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/* remove pcb from list */
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pcb2->next = pcb->next;
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}
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}
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memp_free(MEMP_UDP_PCB, pcb);
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Create a UDP PCB.
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*
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* @return The UDP PCB which was created. NULL if the PCB data structure
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* could not be allocated.
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*
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* @see udp_remove()
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*/
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struct udp_pcb *
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udp_new(void) {
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struct udp_pcb *pcb;
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pcb = memp_malloc(MEMP_UDP_PCB);
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/* could allocate UDP PCB? */
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if(pcb != NULL) {
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pcb->flags = 0;
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/* initialize PCB to all zeroes */
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memset(pcb, 0, sizeof(struct udp_pcb));
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return pcb;
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}
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return NULL;
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return pcb;
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}
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/*-----------------------------------------------------------------------------------*/
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#if UDP_DEBUG
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