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pimd: Allow breaking up of packet.

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When a packet is too large to send in one go, break it up.

Ticket: CM-12768
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2016-09-08 08:42:04 -04:00
parent 60ce8d9b4c
commit c305ed63eb
1 changed files with 57 additions and 27 deletions
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84
pimd/pim_pim.c
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@ -480,14 +480,62 @@ void pim_sock_reset(struct interface *ifp)
static uint16_t ip_id = 0;
int pim_msg_send(int fd,
struct in_addr src,
struct in_addr dst,
uint8_t *pim_msg,
int pim_msg_size,
const char *ifname)
static int
pim_msg_send_frame (int fd, char *buf, size_t len,
struct sockaddr *dst, size_t salen)
{
struct ip *ip = (struct ip *)buf;
while (sendto (fd, buf, len, MSG_DONTWAIT, dst, salen) < 0)
{
char dst_str[100];
switch (errno)
{
case EMSGSIZE:
{
size_t hdrsize = sizeof (struct ip);
size_t newlen1 = ((len - hdrsize) / 2 ) & 0xFFF8;
size_t sendlen = newlen1 + hdrsize;
size_t offset = ntohs (ip->ip_off);
ip->ip_len = htons (sendlen);
ip->ip_off = htons (offset | IP_MF);
if (pim_msg_send_frame (fd, buf, sendlen, dst, salen) == 0)
{
struct ip *ip2 = (struct ip *)(buf + newlen1);
size_t newlen2 = len - sendlen;
sendlen = newlen2 + hdrsize;
memcpy (ip2, ip, hdrsize);
ip2->ip_len = htons (sendlen);
ip2->ip_off = htons (offset + (newlen1 >> 3));
return pim_msg_send_frame (fd, (char *)ip2, sendlen, dst, salen);
}
}
return -1;
break;
default:
pim_inet4_dump ("<dst?>", ip->ip_dst, dst_str, sizeof (dst_str));
zlog_warn ("%s: sendto() failure to %s: fd=%d msg_size=%zd: errno=%d: %s",
__PRETTY_FUNCTION__,
dst_str, fd, len,
errno, safe_strerror(errno));
break;
return -1;
}
}
return 0;
}
int
pim_msg_send(int fd, struct in_addr src,
struct in_addr dst, uint8_t *pim_msg,
int pim_msg_size, const char *ifname)
{
ssize_t sent;
struct sockaddr_in to;
socklen_t tolen;
unsigned char buffer[3000];
@ -528,26 +576,8 @@ int pim_msg_send(int fd,
pim_pkt_dump(__PRETTY_FUNCTION__, pim_msg, pim_msg_size);
}
sent = sendto(fd, buffer, sendlen, MSG_DONTWAIT,
(struct sockaddr *)&to, tolen);
if (sent != (ssize_t) sendlen) {
char dst_str[100];
pim_inet4_dump("<dst?>", dst, dst_str, sizeof(dst_str));
if (sent < 0) {
zlog_warn("%s: sendto() failure to %s on %s: fd=%d msg_size=%d: errno=%d: %s",
__PRETTY_FUNCTION__,
dst_str, ifname, fd, pim_msg_size,
errno, safe_strerror(errno));
}
else {
zlog_warn("%s: sendto() partial to %s on %s: fd=%d msg_size=%d: sent=%zd",
__PRETTY_FUNCTION__,
dst_str, ifname, fd,
pim_msg_size, sent);
}
return -1;
}
pim_msg_send_frame (fd, (char *)buffer, sendlen,
(struct sockaddr *)&to, tolen);
return 0;
}