throttle outgoing LASTSEEN packets to at most one per second for a given seq#
[l2tpns.git] / ppp.c
diff --git a/ppp.c b/ppp.c
index e71be55..0d9dc01 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -1,6 +1,6 @@
 // L2TPNS PPP Stuff
 
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.38 2004/11/30 19:34:57 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.40 2005/01/05 13:50:30 bodea Exp $";
 
 #include <stdio.h>
 #include <string.h>
@@ -19,20 +19,20 @@ extern sessiont *session;
 extern radiust *radius;
 extern int tunfd;
 extern char hostname[];
-extern u32 eth_tx;
+extern uint32_t eth_tx;
 extern time_t time_now;
 extern configt *config;
 
 static void initccp(tunnelidt t, sessionidt s);
 
 // Process PAP messages
-void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 {
        char user[129];
        char pass[129];
-       u16 hl;
+       uint16_t hl;
 
-       CSTAT(call_processpap);
+       CSTAT(processpap);
 
        LOG_HEX(5, "PAP", p, l);
        if (l < 4)
@@ -42,7 +42,7 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l)
                return ;
        }
 
-       if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+       if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
        {
                LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
                STAT(tunnel_rx_errors);
@@ -58,7 +58,7 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l)
        }
 
        {
-               u8 *b = p;
+               uint8_t *b = p;
                b += 4;
                if (*b && *b < sizeof(user))
                        memcpy(user, b + 1, *b);
@@ -72,18 +72,18 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l)
        if (session[s].ip || !session[s].radius)
        {
                // respond now, either no RADIUS available or already authenticated
-               u8 b[MAXCONTROL];
-               u8 id = p[1];
-               u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
+               uint8_t b[MAXCONTROL];
+               uint8_t id = p[1];
+               uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
                if (!p) return;
 
                if (session[s].ip)
-                       *p = 2;                 // ACK
+                       *p = 2;                         // ACK
                else
-                       *p = 3;                 // cant authorise
+                       *p = 3;                         // cant authorise
                p[1] = id;
-               *(u16 *) (p + 2) = htons(5);    // length
-               p[4] = 0;                       // no message
+               *(uint16_t *) (p + 2) = htons(5);       // length
+               p[4] = 0;                               // no message
                if (session[s].ip)
                {
                        LOG(3, s, t, "Already an IP allocated: %s (%d)\n",
@@ -101,7 +101,7 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l)
        else
        {
                // set up RADIUS request
-               u16 r = session[s].radius;
+               uint16_t r = session[s].radius;
 
                // Run PRE_AUTH plugins
                struct param_pre_auth packet = { &tunnel[t], &session[s], strdup(user), strdup(pass), PPPPAP, 1 };
@@ -127,12 +127,12 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l)
 }
 
 // Process CHAP messages
-void processchap(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 {
-       u16 r;
-       u16 hl;
+       uint16_t r;
+       uint16_t hl;
 
-       CSTAT(call_processchap);
+       CSTAT(processchap);
 
        LOG_HEX(5, "CHAP", p, l);
        r = session[s].radius;
@@ -153,7 +153,7 @@ void processchap(tunnelidt t, sessionidt s, u8 *p, u16 l)
                return ;
        }
 
-       if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+       if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
        {
                LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
                STAT(tunnel_rx_errors);
@@ -224,29 +224,13 @@ void processchap(tunnelidt t, sessionidt s, u8 *p, u16 l)
        radiussend(r, RADIUSAUTH);
 }
 
-static char *ppp_lcp_types[] = {
-       NULL,
-       "ConfigReq",
-       "ConfigAck",
-       "ConfigNak",
-       "ConfigRej",
-       "TerminateReq",
-       "TerminateAck",
-       "CodeRej",
-       "ProtocolRej",
-       "EchoReq",
-       "EchoReply",
-       "DiscardRequest",
-       "IdentRequest",
-};
-
-static void dumplcp(u8 *p, int l)
+static void dumplcp(uint8_t *p, int l)
 {
        int x = l - 4;
-       u8 *o = (p + 4);
+       uint8_t *o = (p + 4);
 
        LOG_HEX(5, "PPP LCP Packet", p, l);
-       LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
+       LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_type((int)*p), ntohs( ((uint16_t *) p)[1]) );
        LOG(4, 0, 0, "Length: %d\n", l);
        if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck)
                return;
@@ -271,48 +255,48 @@ static void dumplcp(u8 *p, int l)
                {
                        case 1: // Maximum-Receive-Unit
                                if (length == 4)
-                                       LOG(4, 0, 0, "    %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2)));
+                                       LOG(4, 0, 0, "    %s %d\n", lcp_type(type), ntohs(*(uint16_t *)(o + 2)));
                                else
-                                       LOG(4, 0, 0, "    %s odd length %d\n", lcp_types[type], length);
+                                       LOG(4, 0, 0, "    %s odd length %d\n", lcp_type(type), length);
                                break;
                        case 2: // Async-Control-Character-Map
                                if (length == 6)
                                {
-                                       u32 asyncmap = ntohl(*(u32 *)(o + 2));
-                                       LOG(4, 0, 0, "    %s %x\n", lcp_types[type], asyncmap);
+                                       uint32_t asyncmap = ntohl(*(uint32_t *)(o + 2));
+                                       LOG(4, 0, 0, "    %s %x\n", lcp_type(type), asyncmap);
                                }
                                else
-                                       LOG(4, 0, 0, "   %s odd length %d\n", lcp_types[type], length);
+                                       LOG(4, 0, 0, "   %s odd length %d\n", lcp_type(type), length);
                                break;
                        case 3: // Authentication-Protocol
                                if (length == 4)
                                {
-                                       int proto = ntohs(*(u16 *)(o + 2));
-                                       LOG(4, 0, 0, "   %s 0x%x (%s)\n", lcp_types[type], proto,
+                                       int proto = ntohs(*(uint16_t *)(o + 2));
+                                       LOG(4, 0, 0, "   %s 0x%x (%s)\n", lcp_type(type), proto,
                                                proto == PPPCHAP ? "CHAP" :
                                                proto == PPPPAP  ? "PAP"  : "UNKNOWN");
                                }
                                else
-                                       LOG(4, 0, 0, "   %s odd length %d\n", lcp_types[type], length);
+                                       LOG(4, 0, 0, "   %s odd length %d\n", lcp_type(type), length);
                                break;
                        case 4: // Quality-Protocol
                                {
-                                       u32 qp = ntohl(*(u32 *)(o + 2));
-                                       LOG(4, 0, 0, "    %s %x\n", lcp_types[type], qp);
+                                       uint32_t qp = ntohl(*(uint32_t *)(o + 2));
+                                       LOG(4, 0, 0, "    %s %x\n", lcp_type(type), qp);
                                }
                                break;
                        case 5: // Magic-Number
                                if (length == 6)
                                {
-                                       u32 magicno = ntohl(*(u32 *)(o + 2));
-                                       LOG(4, 0, 0, "    %s %x\n", lcp_types[type], magicno);
+                                       uint32_t magicno = ntohl(*(uint32_t *)(o + 2));
+                                       LOG(4, 0, 0, "    %s %x\n", lcp_type(type), magicno);
                                }
                                else
-                                       LOG(4, 0, 0, "   %s odd length %d\n", lcp_types[type], length);
+                                       LOG(4, 0, 0, "   %s odd length %d\n", lcp_type(type), length);
                                break;
                        case 7: // Protocol-Field-Compression
                        case 8: // Address-And-Control-Field-Compression
-                               LOG(4, 0, 0, "    %s\n", lcp_types[type]);
+                               LOG(4, 0, 0, "    %s\n", lcp_type(type));
                                break;
                        default:
                                LOG(2, 0, 0, "    Unknown PPP LCP Option type %d\n", type);
@@ -324,14 +308,14 @@ static void dumplcp(u8 *p, int l)
 }
 
 // Process LCP messages
-void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 {
-       u8 b[MAXCONTROL];
-       u8 *q = NULL;
-       u32 magicno = 0;
-       u16 hl;
+       uint8_t b[MAXCONTROL];
+       uint8_t *q = NULL;
+       uint32_t magicno = 0;
+       uint16_t hl;
 
-       CSTAT(call_processlcp);
+       CSTAT(processlcp);
 
        LOG_HEX(5, "LCP", p, l);
        if (l < 4)
@@ -341,7 +325,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                return ;
        }
 
-       if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+       if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
        {
                LOG(1, s, t, "Length mismatch LCP %u/%u\n", hl, l);
                STAT(tunnel_rx_errors);
@@ -357,8 +341,8 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
        else if (*p == ConfigReq)
        {
                int x = l - 4;
-               u8 *o = (p + 4);
-               u8 *response = 0;
+               uint8_t *o = (p + 4);
+               uint8_t *response = 0;
 
                LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
                if (config->debug > 3) dumplcp(p, l);
@@ -372,11 +356,11 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                        switch (type)
                        {
                                case 1: // Maximum-Receive-Unit
-                                       session[s].mru = ntohs(*(u16 *)(o + 2));
+                                       session[s].mru = ntohs(*(uint16_t *)(o + 2));
                                        break;
 
                                case 2: // Async-Control-Character-Map
-                                       if (!ntohl(*(u32 *)(o + 2))) // all bits zero is OK
+                                       if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK
                                                break;
 
                                        if (response && *response != ConfigNak) // rej already queued
@@ -401,12 +385,12 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                                        *q++ = 6;
                                        memset(q, 0, 4); // asyncmap 0
                                        q += 4;
-                                       *((u16 *) (response + 2)) = htons(q - response); // LCP header length
+                                       *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length
                                        break;
 
                                case 3: // Authentication-Protocol
                                        {
-                                               int proto = ntohs(*(u16 *)(o + 2));
+                                               int proto = ntohs(*(uint16_t *)(o + 2));
                                                char proto_name[] = "0x0000";
                                                if (proto == PPPPAP)
                                                        break;
@@ -436,14 +420,14 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                                                }
 
                                                memcpy(q, o, length);
-                                               *(u16 *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead
+                                               *(uint16_t *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead
                                                q += length;
-                                               *((u16 *) (response + 2)) = htons(q - response);
+                                               *((uint16_t *) (response + 2)) = htons(q - response);
                                        }
                                        break;
 
                                case 5: // Magic-Number
-                                       magicno = ntohl(*(u32 *)(o + 2));
+                                       magicno = ntohl(*(uint32_t *)(o + 2));
                                        break;
 
                                case 4: // Quality-Protocol
@@ -469,7 +453,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
 
                                        memcpy(q, o, length);
                                        q += length;
-                                       *((u16 *) (response + 2)) = htons(q - response); // LCP header length
+                                       *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length
                        }
                        x -= length;
                        o += length;
@@ -483,7 +467,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                        *q = ConfigAck;
                }
 
-               LOG(3, s, t, "Sending %s\n", ppp_lcp_types[*response]);
+               LOG(3, s, t, "Sending %s\n", ppp_lcp_type(*response));
                tunnelsend(b, l + (q - b), t);
 
                if (!(session[s].flags & SF_LCP_ACKED))
@@ -512,7 +496,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
        {
                LOG(5, s, t, "LCP: Received EchoReq.  Sending EchoReply\n");
                *p = EchoReply;         // reply
-               *(u32 *) (p + 4) = htonl(session[s].magic); // our magic number
+               *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number
                q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
                if (!q) return;
                tunnelsend(b, l + (q - b), t); // send it
@@ -543,9 +527,9 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
 }
 
 // find a PPP option, returns point to option, or 0 if not found
-static u8 *findppp(u8 *b, u8 mtype)
+static uint8_t *findppp(uint8_t *b, uint8_t mtype)
 {
-       u16 l = ntohs(*(u16 *) (b + 2));
+       uint16_t l = ntohs(*(uint16_t *) (b + 2));
        if (l < 4)
                return 0;
        b += 4;
@@ -563,11 +547,11 @@ static u8 *findppp(u8 *b, u8 mtype)
 }
 
 // Process IPCP messages
-void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 {
-       u16 hl;
+       uint16_t hl;
 
-       CSTAT(call_processipcp);
+       CSTAT(processipcp);
 
        LOG_HEX(5, "IPCP", p, l);
        if (l < 5)
@@ -577,7 +561,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                return ;
        }
 
-       if ((hl = ntohs(*(u16 *) (p + 2))) > l)
+       if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
        {
                LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l);
                STAT(tunnel_rx_errors);
@@ -588,7 +572,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
        if (*p == ConfigAck)
        {
                // happy with our IPCP
-               u16 r = session[s].radius;
+               uint16_t r = session[s].radius;
                if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden)
                {
                        if (!r)
@@ -620,9 +604,8 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
        }
        // form a config reply quoting the IP in the session
        {
-               u8 b[MAXCONTROL];
-               u8 *i,
-               *q;
+               uint8_t b[MAXCONTROL];
+               uint8_t *i, *q;
 
                q = p + 4;
                i = p + l;
@@ -635,7 +618,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                if (q < i)
                {
                        // reject
-                       u16 n = 4;
+                       uint16_t n = 4;
                        i = p + l;
                        if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
                                return;
@@ -652,7 +635,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                                }
                                p += p[1];
                        }
-                       *(u16 *) (q + 2) = htons(n);
+                       *(uint16_t *) (q + 2) = htons(n);
                        LOG(4, s, t, "Sending ConfigRej\n");
                        tunnelsend(b, n + (q - b), t); // send it
                }
@@ -662,9 +645,9 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                        *p = ConfigAck;
                        if ((i = findppp(p, 0x81))) // Primary DNS address
                        {
-                               if (*(u32 *) (i + 2) != htonl(session[s].dns1))
+                               if (*(uint32_t *) (i + 2) != htonl(session[s].dns1))
                                {
-                                       *(u32 *) (i + 2) = htonl(session[s].dns1);
+                                       *(uint32_t *) (i + 2) = htonl(session[s].dns1);
                                        *p = ConfigNak;
                                        LOG(5, s, t, "   DNS1 = %s\n",
                                                fmtaddr(htonl(session[s].dns1), 0));
@@ -672,9 +655,9 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                        }
                        if ((i = findppp(p, 0x83))) // Secondary DNS address (TBA, is it)
                        {
-                               if (*(u32 *) (i + 2) != htonl(session[s].dns2))
+                               if (*(uint32_t *) (i + 2) != htonl(session[s].dns2))
                                {
-                                       *(u32 *) (i + 2) = htonl(session[s].dns2);
+                                       *(uint32_t *) (i + 2) = htonl(session[s].dns2);
                                        *p = ConfigNak;
                                        LOG(5, s, t, "   DNS2 = %s\n",
                                                fmtaddr(htonl(session[s].dns2), 0));
@@ -687,9 +670,9 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
                                STAT(tunnel_rx_errors);
                                return ;
                        }
-                       if (*(u32 *) (i + 2) != htonl(session[s].ip))
+                       if (*(uint32_t *) (i + 2) != htonl(session[s].ip))
                        {
-                               *(u32 *) (i + 2) = htonl(session[s].ip);
+                               *(uint32_t *) (i + 2) = htonl(session[s].ip);
                                *p = ConfigNak;
                                LOG(4, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n",
                                                fmtaddr(htonl(session[s].ip), 0));
@@ -706,15 +689,15 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
 //
 // This MUST be called with at least 4 byte behind 'p'.
 // (i.e. this routine writes to p[-4]).
-void processipin(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 {
-       ipt ip;
+       in_addr_t ip;
 
-       CSTAT(call_processipin);
+       CSTAT(processipin);
 
        LOG_HEX(5, "IP", p, l);
 
-       ip = ntohl(*(u32 *)(p + 12));
+       ip = ntohl(*(uint32_t *)(p + 12));
 
        if (l > MAXETHER)
        {
@@ -736,7 +719,7 @@ void processipin(tunnelidt t, sessionidt s, u8 *p, u16 l)
 
        // Add on the tun header
        p -= 4;
-       *(u32 *)p = htonl(0x00000800);
+       *(uint32_t *) p = htonl(0x00000800);
        l += 4;
 
        if (session[s].tbf_in && !config->cluster_iam_master) { // Are we throttled and a slave?
@@ -780,7 +763,7 @@ void processipin(tunnelidt t, sessionidt s, u8 *p, u16 l)
 // Helper routine for the TBF filters.
 // Used to send queued data in from the user.
 //
-void send_ipin(sessionidt s, u8 *buf, int len)
+void send_ipin(sessionidt s, uint8_t *buf, int len)
 {
        LOG_HEX(5, "IP in throttled", buf, len);
 
@@ -813,12 +796,12 @@ void send_ipin(sessionidt s, u8 *buf, int len)
 
 
 // Process CCP messages
-void processccp(tunnelidt t, sessionidt s, u8 *p, u16 l)
+void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l)
 {
-       u8 b[MAXCONTROL];
-       u8 *q;
+       uint8_t b[MAXCONTROL];
+       uint8_t *q;
 
-       CSTAT(call_processccp);
+       CSTAT(processccp);
 
        LOG_HEX(5, "CCP", p, l);
        switch (l > 1 ? *p : 0)
@@ -866,29 +849,28 @@ void processccp(tunnelidt t, sessionidt s, u8 *p, u16 l)
 // send a CHAP PP packet
 void sendchap(tunnelidt t, sessionidt s)
 {
-       u8 b[MAXCONTROL];
-       u16 r = session[s].radius;
-       u8 *q;
+       uint8_t b[MAXCONTROL];
+       uint16_t r = session[s].radius;
+       uint8_t *q;
 
-       CSTAT(call_sendchap);
+       CSTAT(sendchap);
 
        if (!r)
        {
                LOG(1, s, t, "No RADIUS to send challenge\n");
                STAT(tunnel_tx_errors);
-               return ;
+               return;
        }
+
        LOG(1, s, t, "Send CHAP challenge\n");
-       {
-               // new challenge
-               int n;
-               for (n = 0; n < 15; n++)
-                       radius[r].auth[n] = rand();
-       }
+
+       // new challenge
+       random_data(radius[r].auth, sizeof(radius[r].auth));
        radius[r].chap = 1;             // CHAP not PAP
        radius[r].id++;
        if (radius[r].state != RADIUSCHAP)
                radius[r].try = 0;
+
        radius[r].state = RADIUSCHAP;
        radius[r].retry = backoff(radius[r].try++);
        if (radius[r].try > 5)
@@ -905,14 +887,14 @@ void sendchap(tunnelidt t, sessionidt s)
        q[4] = 16;                              // length
        memcpy(q + 5, radius[r].auth, 16);      // challenge
        strcpy(q + 21, hostname);               // our name
-       *(u16 *) (q + 2) = htons(strlen(hostname) + 21); // length
+       *(uint16_t *) (q + 2) = htons(strlen(hostname) + 21); // length
        tunnelsend(b, strlen(hostname) + 21 + (q - b), t); // send it
 }
 
 // fill in a L2TP message with a PPP frame,
 // copies existing PPP message and changes magic number if seen
 // returns start of PPP frame
-u8 *makeppp(u8 *b, int size, u8 *p, int l, tunnelidt t, sessionidt s, u16 mtype)
+uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype)
 {
        if (size < 12) // Need more space than this!!
        {
@@ -922,20 +904,20 @@ u8 *makeppp(u8 *b, int size, u8 *p, int l, tunnelidt t, sessionidt s, u16 mtype)
                return NULL;
        }
 
-       *(u16 *) (b + 0) = htons(0x0002); // L2TP with no options
-       *(u16 *) (b + 2) = htons(tunnel[t].far); // tunnel
-       *(u16 *) (b + 4) = htons(session[s].far); // session
+       *(uint16_t *) (b + 0) = htons(0x0002); // L2TP with no options
+       *(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel
+       *(uint16_t *) (b + 4) = htons(session[s].far); // session
        b += 6;
        if (mtype == PPPLCP || !(session[s].l2tp_flags & SESSIONACFC))
        {
-               *(u16 *) b = htons(0xFF03); // HDLC header
+               *(uint16_t *) b = htons(0xFF03); // HDLC header
                b += 2;
        }
        if (mtype < 0x100 && session[s].l2tp_flags & SESSIONPFC)
                *b++ = mtype;
        else
        {
-               *(u16 *) b = htons(mtype);
+               *(uint16_t *) b = htons(mtype);
                b += 2;
        }
 
@@ -963,14 +945,14 @@ void initlcp(tunnelidt t, sessionidt s)
 
        LOG(4, s, t, "Sending LCP ConfigReq for PAP\n");
        *q = ConfigReq;
-       *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
-       *(u16 *)(q + 2) = htons(14); // Length
-       *(u8 *)(q + 4) = 5;
-       *(u8 *)(q + 5) = 6;
-       *(u32 *)(q + 6) = htonl(session[s].magic);
-       *(u8 *)(q + 10) = 3;
-       *(u8 *)(q + 11) = 4;
-       *(u16 *)(q + 12) = htons(PPPPAP); // PAP
+       *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID
+       *(uint16_t *)(q + 2) = htons(14); // Length
+       *(uint8_t *)(q + 4) = 5;
+       *(uint8_t *)(q + 5) = 6;
+       *(uint32_t *)(q + 6) = htonl(session[s].magic);
+       *(uint8_t *)(q + 10) = 3;
+       *(uint8_t *)(q + 11) = 4;
+       *(uint16_t *)(q + 12) = htons(PPPPAP); // PAP
 
        LOG_HEX(5, "PPPLCP", q, 14);
        tunnelsend(b, (q - b) + 14, t);
@@ -986,8 +968,8 @@ static void initccp(tunnelidt t, sessionidt s)
 
        LOG(4, s, t, "Sending CCP ConfigReq for no compression\n");
        *q = ConfigReq;
-       *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
-       *(u16 *)(q + 2) = htons(4); // Length
+       *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID
+       *(uint16_t *)(q + 2) = htons(4); // Length
 
        LOG_HEX(5, "PPPCCP", q, 4);
        tunnelsend(b, (q - b) + 4 , t);