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udp_input/SO_REUSE_RXTOALL: only call pbuf_header if there is a 2nd pcb to pass the data to

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This commit is contained in:
goldsimon 2010-05-15 17:11:41 +00:00
parent 46b3cb580d
commit d8d964d09e
1 changed files with 12 additions and 5 deletions
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17
src/core/udp.c
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@ -282,8 +282,7 @@ udp_input(struct pbuf *p, struct netif *inp)
/* pass broadcast- or multicast packets to all multicast pcbs
if SOF_REUSEADDR is set on the first match */
struct udp_pcb *mpcb;
/* for that, move payload to IP header again */
pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
u8_t p_header_changed = 0;
for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
if (mpcb != pcb) {
/* compare PCB local addr+port to UDP destination addr+port */
@ -300,7 +299,13 @@ udp_input(struct pbuf *p, struct netif *inp)
#endif /* IP_SOF_BROADCAST_RECV */
/* pass a copy of the packet to all local matches */
if (mpcb->recv != NULL) {
struct pbuf *q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
struct pbuf *q;
/* for that, move payload to IP header again */
if (p_header_changed == 0) {
pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
p_header_changed = 1;
}
q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
if (q != NULL) {
err_t err = pbuf_copy(q, p);
if (err == ERR_OK) {
@ -314,8 +319,10 @@ udp_input(struct pbuf *p, struct netif *inp)
}
}
}
/* and move payload to UDP data again */
pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
if (p_header_changed) {
/* and move payload to UDP data again */
pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
}
}
#endif /* SO_REUSE && SO_REUSE_RXTOALL */
/* callback */