1 files changed, 27 insertions, 1 deletions

diff --git a/accel-pptpd/lcp_opt_mru.c b/accel-pptpd/lcp_opt_mru.c
index 153b0e06..e1c13b47 100644
--- a/accel-pptpd/lcp_opt_mru.c
+++ b/accel-pptpd/lcp_opt_mru.c
@@ -1,16 +1,23 @@
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 #include <arpa/inet.h>
+#include <net/if.h>
+#include <linux/if_ppp.h>
+#include <sys/ioctl.h>
 
 #include "ppp.h"
 #include "ppp_lcp.h"
 #include "log.h"
 
+#define MAX_MTU 1436
+
 static struct lcp_option_t *mru_init(struct ppp_lcp_t *lcp);
 static void mru_free(struct ppp_lcp_t *lcp, struct lcp_option_t *opt);
 static int mru_send_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
 static int mru_send_conf_nak(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
 static int mru_recv_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
+static int mru_recv_conf_ack(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
 static void mru_print(void (*print)(const char *fmt,...),struct lcp_option_t*, uint8_t *ptr);
 
 struct mru_option_t
@@ -26,6 +33,7 @@ static struct lcp_option_handler_t mru_opt_hnd=
 	.send_conf_req=mru_send_conf_req,
 	.send_conf_nak=mru_send_conf_nak,
 	.recv_conf_req=mru_recv_conf_req,
+	.recv_conf_ack=mru_recv_conf_ack,
 	.free=mru_free,
 	.print=mru_print,
 };
@@ -35,7 +43,7 @@ static struct lcp_option_t *mru_init(struct ppp_lcp_t *lcp)
 	struct mru_option_t *mru_opt=malloc(sizeof(*mru_opt));
 	memset(mru_opt,0,sizeof(*mru_opt));
 	mru_opt->mtu=0;
-	mru_opt->mru=1500;
+	mru_opt->mru=MAX_MTU;
 	mru_opt->opt.id=CI_MRU;
 	mru_opt->opt.len=4;
 
@@ -81,6 +89,24 @@ static int mru_recv_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, ui
 	}else return LCP_OPT_NAK;
 }
 
+static int mru_recv_conf_ack(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr)
+{
+	struct mru_option_t *mru_opt = container_of(opt,typeof(*mru_opt), opt);
+	struct ifreq ifr = {
+		.ifr_mtu = mru_opt->mtu,
+	};
+
+	sprintf(ifr.ifr_name,"ppp%i",lcp->ppp->unit_idx);
+
+	if (ioctl(lcp->ppp->unit_fd, PPPIOCSMRU, &mru_opt->mru))
+		log_error("\nlcp:mru: failed to set MRU: %s\n", strerror(errno));
+
+	if (ioctl(sock_fd, SIOCSIFMTU, &ifr))
+		log_error("\nlcp:mru: failed to set MTU: %s\n", strerror(errno));
+	
+	return 0;
+}
+
 static void mru_print(void (*print)(const char *fmt,...),struct lcp_option_t *opt, uint8_t *ptr)
 {
 	struct mru_option_t *mru_opt=container_of(opt,typeof(*mru_opt),opt);