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New tail section of udp_send() that handles both queued and unqueued cases.

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This commit is contained in:
likewise 2003-03-25 12:58:22 +00:00
parent f9e4f4d813
commit 6621f8b88a
1 changed files with 48 additions and 35 deletions
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83
src/core/udp.c
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@ -1,3 +1,8 @@
/**
* @file
* User Datagram Protocol module
*
*/
/*
* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
* All rights reserved.
@ -236,7 +241,7 @@ udp_input(struct pbuf *p, struct netif *inp)
/* Check checksum if this is a match or if it was directed at us. */
if(pcb != NULL || ip_addr_cmp(&inp->ip_addr, &iphdr->dest))
{
DEBUGF(UDP_DEBUG, ("udp_input: calculating checksum\n"));
DEBUGF(UDP_DEBUG | DBG_TRACE, ("udp_input: calculating checksum\n"));
pbuf_header(p, UDP_HLEN);
#ifdef IPv6
if(iphdr->nexthdr == IP_PROTO_UDPLITE) {
@ -247,7 +252,7 @@ udp_input(struct pbuf *p, struct netif *inp)
if(inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),
(struct ip_addr *)&(iphdr->dest),
IP_PROTO_UDPLITE, ntohs(udphdr->len)) != 0) {
DEBUGF(UDP_DEBUG, ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
DEBUGF(UDP_DEBUG | 2, ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
#ifdef UDP_STATS
++lwip_stats.udp.chkerr;
++lwip_stats.udp.drop;
@ -261,7 +266,7 @@ udp_input(struct pbuf *p, struct netif *inp)
if(inet_chksum_pseudo(p, (struct ip_addr *)&(iphdr->src),
(struct ip_addr *)&(iphdr->dest),
IP_PROTO_UDP, p->tot_len) != 0) {
DEBUGF(UDP_DEBUG, ("udp_input: UDP datagram discarded due to failing checksum\n"));
DEBUGF(UDP_DEBUG | 2, ("udp_input: UDP datagram discarded due to failing checksum\n"));
#ifdef UDP_STATS
++lwip_stats.udp.chkerr;
@ -278,7 +283,7 @@ udp_input(struct pbuf *p, struct netif *inp)
snmp_inc_udpindatagrams();
pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src), src);
} else {
DEBUGF(UDP_DEBUG, ("udp_input: not for us.\n"));
DEBUGF(UDP_DEBUG | DBG_TRACE, ("udp_input: not for us.\n"));
/* No match was found, send ICMP destination port unreachable unless
destination address was broadcast/multicast. */
@ -325,42 +330,42 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
struct netif *netif;
struct ip_addr *src_ip;
err_t err;
struct pbuf *hdr;
struct pbuf *q; /* q will be sent down the stack */
DEBUGF(UDP_DEBUG, ("udp_send\n"));
DEBUGF(UDP_DEBUG | DBG_TRACE | 3, ("udp_send\n"));
/* if the PCB is not yet bound, bind it here */
if(pcb->local_port == 0) {
err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
if(err != ERR_OK)
return err;
}
/* hdr will point to the UDP header pbuf if an extra header pbuf has
to be allocated. */
hdr = NULL;
/* not enough space to add an UDP header to first pbuf in given p chain? */
if(pbuf_header(p, UDP_HLEN)) {
if (pbuf_header(p, UDP_HLEN)) {
/* allocate header in new pbuf */
hdr = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
/* new header pbuf could not be allocated? */
if(hdr == NULL) {
if (q == NULL) {
return ERR_MEM;
}
/* chain header in front of given pbuf */
pbuf_chain(hdr, p);
/* have p point to header pbuf */
p = hdr;
/* chain header q in front of given pbuf p */
pbuf_chain(q, p);
/* { first pbuf q points to header pbuf } */
DEBUGF(UDP_DEBUG, ("udp_send: added header pbuf %q before given pbuf %p\n", (void *)q, (void *)p));
} else {
/* first pbuf q equals given pbuf */
q = p;
DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
}
DEBUGF(UDP_DEBUG, ("udp_send: got pbuf\n"));
udphdr = p->payload;
udphdr = q->payload;
udphdr->src = htons(pcb->local_port);
udphdr->dest = htons(pcb->remote_port);
udphdr->chksum = 0x0000;
if((netif = ip_route(&(pcb->remote_ip))) == NULL) {
DEBUGF(UDP_DEBUG, ("udp_send: No route to 0x%lx\n", pcb->remote_ip.addr));
DEBUGF(UDP_DEBUG | 1, ("udp_send: No route to 0x%lx\n", pcb->remote_ip.addr));
#ifdef UDP_STATS
++lwip_stats.udp.rterr;
#endif /* UDP_STATS */
@ -375,27 +380,27 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
src_ip = &(pcb->local_ip);
}
DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %u\n", p->tot_len));
DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %u\n", q->tot_len));
/* UDP Lite protocol? */
if(pcb->flags & UDP_FLAGS_UDPLITE) {
DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %u\n", p->tot_len));
DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %u\n", q->tot_len));
/* set UDP message length in UDP header */
udphdr->len = htons(pcb->chksum_len);
/* calculate checksum */
udphdr->chksum = inet_chksum_pseudo(p, src_ip, &(pcb->remote_ip),
udphdr->chksum = inet_chksum_pseudo(q, src_ip, &(pcb->remote_ip),
IP_PROTO_UDP, pcb->chksum_len);
/* chksum zero must become 0xffff, as zero means 'no checksum' */
if(udphdr->chksum == 0x0000) udphdr->chksum = 0xffff;
/* output to IP */
err = ip_output_if(p, src_ip, &pcb->remote_ip, UDP_TTL, IP_PROTO_UDPLITE, netif);
err = ip_output_if(q, src_ip, &pcb->remote_ip, UDP_TTL, IP_PROTO_UDPLITE, netif);
snmp_inc_udpoutdatagrams();
} else {
DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %u\n", p->tot_len));
udphdr->len = htons(p->tot_len);
DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %u\n", q->tot_len));
udphdr->len = htons(q->tot_len);
/* calculate checksum */
if((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
udphdr->chksum = inet_chksum_pseudo(p, src_ip, &pcb->remote_ip, IP_PROTO_UDP, p->tot_len);
udphdr->chksum = inet_chksum_pseudo(q, src_ip, &pcb->remote_ip, IP_PROTO_UDP, q->tot_len);
/* chksum zero must become 0xffff, as zero means 'no checksum' */
if(udphdr->chksum == 0x0000) udphdr->chksum = 0xffff;
}
@ -403,14 +408,21 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
snmp_inc_udpoutdatagrams();
DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if(,,,,IP_PROTO_UDP,)\n"));
/* output to IP */
err = ip_output_if(p, src_ip, &pcb->remote_ip, UDP_TTL, IP_PROTO_UDP, netif);
err = ip_output_if(q, src_ip, &pcb->remote_ip, UDP_TTL, IP_PROTO_UDP, netif);
}
/* dechain and free any header pbuf */
if(hdr != NULL) {
/* detach the header prepended earlier */
pbuf_dechain(hdr);
/* free the header */
pbuf_free(hdr);
/* did we chain a header? */
if (q != p) {
/* chained header still in front of given pbuf? */
if (q->next == p) {
DEBUGF(UDP_DEBUG, ("udp_send: dechaining and freeing header pbuf\n"));
/* detach the header prepended earlier */
pbuf_dechain(q);
/* free the header */
pbuf_free(q);
} else {
DEBUGF(UDP_DEBUG, ("udp_send: pbuf header not freed, seems to be queued.\n"));
}
}
#ifdef UDP_STATS
@ -418,6 +430,7 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
#endif /* UDP_STATS */
return err;
}
/**
* Bind an UDP PCB.
*
@ -479,7 +492,7 @@ udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr, u16_t port)
port++;
ipcb = udp_pcbs;
} else
ipcb = ipcb->next;
ipcb = ipcb->next;
}
if(ipcb) {
/* no more ports available in local range */