X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=pppd%2Fplugins%2Frp-pppoe%2Fplugin.c;h=97011aaab938cc5066281846113ebf1bac32921a;hb=fd1dcdf758418f040da3ed801ab001b5e46854e7;hp=9bd66433f3fec933905f6d073814d0292d3936a1;hpb=cab58617fd9d328029fffabc788020264b4fa91f;p=ppp.git

diff --git a/pppd/plugins/rp-pppoe/plugin.c b/pppd/plugins/rp-pppoe/plugin.c
index 9bd6643..97011aa 100644
--- a/pppd/plugins/rp-pppoe/plugin.c
+++ b/pppd/plugins/rp-pppoe/plugin.c
@@ -130,6 +130,31 @@ static int
 PPPOEConnectDevice(void)
 {
     struct sockaddr_pppox sp;
+    struct ifreq ifr;
+    int s;
+
+    /* Restore configuration */
+    lcp_allowoptions[0].mru = conn->mtu;
+    lcp_wantoptions[0].mru = conn->mru;
+
+    /* Update maximum MRU */
+    s = socket(AF_INET, SOCK_DGRAM, 0);
+    if (s < 0) {
+	error("Can't get MTU for %s: %m", conn->ifName);
+	goto errout;
+    }
+    strncpy(ifr.ifr_name, conn->ifName, sizeof(ifr.ifr_name));
+    if (ioctl(s, SIOCGIFMTU, &ifr) < 0) {
+	error("Can't get MTU for %s: %m", conn->ifName);
+	close(s);
+	goto errout;
+    }
+    close(s);
+
+    if (lcp_allowoptions[0].mru > ifr.ifr_mtu - TOTAL_OVERHEAD)
+	lcp_allowoptions[0].mru = ifr.ifr_mtu - TOTAL_OVERHEAD;
+    if (lcp_wantoptions[0].mru > ifr.ifr_mtu - TOTAL_OVERHEAD)
+	lcp_wantoptions[0].mru = ifr.ifr_mtu - TOTAL_OVERHEAD;
 
     conn->acName = acName;
     conn->serviceName = pppd_pppoe_service;
@@ -163,6 +188,7 @@ PPPOEConnectDevice(void)
 	error("Failed to create PPPoE socket: %m");
 	goto errout;
     }
+
     sp.sa_family = AF_PPPOX;
     sp.sa_protocol = PX_PROTO_OE;
     sp.sa_addr.pppoe.sid = conn->session;
@@ -381,6 +407,10 @@ void pppoe_check_options(void)
     if (lcp_wantoptions[0].mru > MAX_PPPOE_MTU)
 	lcp_wantoptions[0].mru = MAX_PPPOE_MTU;
 
+    /* Save configuration */
+    conn->mtu = lcp_allowoptions[0].mru;
+    conn->mru = lcp_wantoptions[0].mru;
+
     ccp_allowoptions[0].deflate = 0;
     ccp_wantoptions[0].deflate = 0;