Changes in uspace/srv/net/inetsrv/pdu.c [44c9ef4:a1a101d] in mainline

File:

• uspace/srv/net/inetsrv/pdu.c (modified) (4 diffs)

uspace/srv/net/inetsrv/pdu.c

@@ -44 +44 @@
 #include <mem.h>
 #include <stdlib.h>
-#include <net/socket_codes.h>
+
 #include "inetsrv.h"
 #include "inet_std.h"
 #include "pdu.h"
+
+static FIBRIL_MUTEX_INITIALIZE(ip_ident_lock);
+static uint16_t ip_ident = 0;
 
 /** One's complement addition.
@@ -85 +88 @@
 }
 
-/** Encode IPv4 PDU.
+/** Encode Internet PDU.
  *
  * Encode internet packet into PDU (serialized form). Will encode a
@@ -93 +96 @@
  * be set in the header, otherwise the offset will equal @a packet->size.
  *
- * @param packet Packet to encode
- * @param src    Source address
- * @param dest   Destination address
- * @param offs   Offset into packet payload (in bytes)
- * @param mtu    MTU (Maximum Transmission Unit) in bytes
- * @param rdata  Place to store pointer to allocated data buffer
- * @param rsize  Place to store size of allocated data buffer
- * @param roffs  Place to store offset of remaning data
- *
- */
-int inet_pdu_encode(inet_packet_t *packet, addr32_t src, addr32_t dest,
-    size_t offs, size_t mtu, void **rdata, size_t *rsize, size_t *roffs)
-{
+ * @param packet        Packet to encode
+ * @param offs          Offset into packet payload (in bytes)
+ * @param mtu           MTU (Maximum Transmission Unit) in bytes
+ * @param rdata         Place to store pointer to allocated data buffer
+ * @param rsize         Place to store size of allocated data buffer
+ * @param roffs         Place to store offset of remaning data
+ */
+int inet_pdu_encode(inet_packet_t *packet, size_t offs, size_t mtu,
+    void **rdata, size_t *rsize, size_t *roffs)
+{
+        void *data;
+        size_t size;
+        ip_header_t *hdr;
+        size_t hdr_size;
+        size_t data_offs;
+        uint16_t chksum;
+        uint16_t ident;
+        uint16_t flags_foff;
+        uint16_t foff;
+        size_t fragoff_limit;
+        size_t xfer_size;
+        size_t spc_avail;
+        size_t rem_offs;
+
         /* Upper bound for fragment offset field */
-        size_t fragoff_limit = 1 << (FF_FRAGOFF_h - FF_FRAGOFF_l);
-        
+        fragoff_limit = 1 << (FF_FRAGOFF_h - FF_FRAGOFF_l);
+
         /* Verify that total size of datagram is within reasonable bounds */
         if (offs + packet->size > FRAG_OFFS_UNIT * fragoff_limit)
                 return ELIMIT;
-        
-        size_t hdr_size = sizeof(ip_header_t);
-        if (hdr_size >= mtu)
-                return EINVAL;
-        
-        assert(hdr_size % 4 == 0);
+
+        hdr_size = sizeof(ip_header_t);
+        data_offs = ROUND_UP(hdr_size, 4);
+
         assert(offs % FRAG_OFFS_UNIT == 0);
         assert(offs / FRAG_OFFS_UNIT < fragoff_limit);
-        
+
         /* Value for the fragment offset field */
-        uint16_t foff = offs / FRAG_OFFS_UNIT;
-        
+        foff = offs / FRAG_OFFS_UNIT;
+
+        if (hdr_size >= mtu)
+                return EINVAL;
+
         /* Amount of space in the PDU available for payload */
-        size_t spc_avail = mtu - hdr_size;
+        spc_avail = mtu - hdr_size;
         spc_avail -= (spc_avail % FRAG_OFFS_UNIT);
-        
+
         /* Amount of data (payload) to transfer */
-        size_t xfer_size = min(packet->size - offs, spc_avail);
-        
+        xfer_size = min(packet->size - offs, spc_avail);
+
         /* Total PDU size */
-        size_t size = hdr_size + xfer_size;
-        
+        size = hdr_size + xfer_size;
+
         /* Offset of remaining payload */
-        size_t rem_offs = offs + xfer_size;
-        
+        rem_offs = offs + xfer_size;
+
         /* Flags */
-        uint16_t flags_foff =
+        flags_foff =
             (packet->df ? BIT_V(uint16_t, FF_FLAG_DF) : 0) +
             (rem_offs < packet->size ? BIT_V(uint16_t, FF_FLAG_MF) : 0) +
             (foff << FF_FRAGOFF_l);
-        
-        void *data = calloc(size, 1);
+
+        data = calloc(size, 1);
         if (data == NULL)
                 return ENOMEM;
-        
+
+        /* Allocate identifier */
+        fibril_mutex_lock(&ip_ident_lock);
+        ident = ++ip_ident;
+        fibril_mutex_unlock(&ip_ident_lock);
+
         /* Encode header fields */
-        ip_header_t *hdr = (ip_header_t *) data;
-        
-        hdr->ver_ihl =
-            (4 << VI_VERSION_l) | (hdr_size / sizeof(uint32_t));
+        hdr = (ip_header_t *)data;
+        hdr->ver_ihl = (4 << VI_VERSION_l) | (hdr_size / sizeof(uint32_t));
         hdr->tos = packet->tos;
         hdr->tot_len = host2uint16_t_be(size);
-        hdr->id = host2uint16_t_be(packet->ident);
+        hdr->id = host2uint16_t_be(ident);
         hdr->flags_foff = host2uint16_t_be(flags_foff);
         hdr->ttl = packet->ttl;
         hdr->proto = packet->proto;
         hdr->chksum = 0;
-        hdr->src_addr = host2uint32_t_be(src);
-        hdr->dest_addr = host2uint32_t_be(dest);
-        
+        hdr->src_addr = host2uint32_t_be(packet->src.ipv4);
+        hdr->dest_addr = host2uint32_t_be(packet->dest.ipv4);
+
         /* Compute checksum */
-        uint16_t chksum = inet_checksum_calc(INET_CHECKSUM_INIT,
-            (void *) hdr, hdr_size);
+        chksum = inet_checksum_calc(INET_CHECKSUM_INIT, (void *)hdr, hdr_size);
         hdr->chksum = host2uint16_t_be(chksum);
-        
+
         /* Copy payload */
-        memcpy((uint8_t *) data + hdr_size, packet->data + offs, xfer_size);
-        
+        memcpy((uint8_t *)data + data_offs, packet->data + offs, xfer_size);
+
         *rdata = data;
         *rsize = size;
         *roffs = rem_offs;
-        
+
         return EOK;
 }
 
-/** Encode IPv6 PDU.
- *
- * Encode internet packet into PDU (serialized form). Will encode a
- * fragment of the payload starting at offset @a offs. The resulting
- * PDU will have at most @a mtu bytes. @a *roffs will be set to the offset
- * of remaining payload. If some data is remaining, the MF flag will
- * be set in the header, otherwise the offset will equal @a packet->size.
- *
- * @param packet Packet to encode
- * @param src    Source address
- * @param dest   Destination address
- * @param offs   Offset into packet payload (in bytes)
- * @param mtu    MTU (Maximum Transmission Unit) in bytes
- * @param rdata  Place to store pointer to allocated data buffer
- * @param rsize  Place to store size of allocated data buffer
- * @param roffs  Place to store offset of remaning data
- *
- */
-int inet_pdu_encode6(inet_packet_t *packet, addr128_t src, addr128_t dest,
-    size_t offs, size_t mtu, void **rdata, size_t *rsize, size_t *roffs)
-{
-        /* IPv6 mandates a minimal MTU of 1280 bytes */
-        if (mtu < 1280)
-                return ELIMIT;
-        
-        /* Upper bound for fragment offset field */
-        size_t fragoff_limit = 1 << (OF_FRAGOFF_h - OF_FRAGOFF_l);
-        
-        /* Verify that total size of datagram is within reasonable bounds */
-        if (offs + packet->size > FRAG_OFFS_UNIT * fragoff_limit)
-                return ELIMIT;
-        
-        /* Determine whether we need the Fragment extension header */
-        bool fragment;
-        if (offs == 0)
-                fragment = (packet->size + sizeof(ip6_header_t) > mtu);
-        else
-                fragment = true;
-        
-        size_t hdr_size;
-        if (fragment)
-                hdr_size = sizeof(ip6_header_t) + sizeof(ip6_header_fragment_t);
-        else
-                hdr_size = sizeof(ip6_header_t);
-        
-        if (hdr_size >= mtu)
-                return EINVAL;
-        
-        assert(sizeof(ip6_header_t) % 8 == 0);
-        assert(hdr_size % 8 == 0);
-        assert(offs % FRAG_OFFS_UNIT == 0);
-        assert(offs / FRAG_OFFS_UNIT < fragoff_limit);
-        
-        /* Value for the fragment offset field */
-        uint16_t foff = offs / FRAG_OFFS_UNIT;
-        
-        /* Amount of space in the PDU available for payload */
-        size_t spc_avail = mtu - hdr_size;
-        spc_avail -= (spc_avail % FRAG_OFFS_UNIT);
-        
-        /* Amount of data (payload) to transfer */
-        size_t xfer_size = min(packet->size - offs, spc_avail);
-        
-        /* Total PDU size */
-        size_t size = hdr_size + xfer_size;
-        
-        /* Offset of remaining payload */
-        size_t rem_offs = offs + xfer_size;
-        
-        /* Flags */
-        uint16_t offsmf =
-            (rem_offs < packet->size ? BIT_V(uint16_t, OF_FLAG_M) : 0) +
-            (foff << OF_FRAGOFF_l);
-        
-        void *data = calloc(size, 1);
-        if (data == NULL)
-                return ENOMEM;
-        
-        /* Encode header fields */
-        ip6_header_t *hdr6 = (ip6_header_t *) data;
-        
-        hdr6->ver_tc = (6 << (VI_VERSION_l));
-        memset(hdr6->tc_fl, 0, 3);
-        hdr6->hop_limit = packet->ttl;
-        
-        host2addr128_t_be(src, hdr6->src_addr);
-        host2addr128_t_be(dest, hdr6->dest_addr);
-        
-        /* Optionally encode Fragment extension header fields */
-        if (fragment) {
-                assert(offsmf != 0);
-                
-                hdr6->payload_len = host2uint16_t_be(packet->size +
-                    sizeof(ip6_header_fragment_t));
-                hdr6->next = IP6_NEXT_FRAGMENT;
-                
-                ip6_header_fragment_t *hdr6f = (ip6_header_fragment_t *)
-                    (hdr6 + 1);
-                
-                hdr6f->next = packet->proto;
-                hdr6f->reserved = 0;
-                hdr6f->offsmf = host2uint16_t_be(offsmf);
-                hdr6f->id = host2uint32_t_be(packet->ident);
-        } else {
-                assert(offsmf == 0);
-                
-                hdr6->payload_len = host2uint16_t_be(packet->size);
-                hdr6->next = packet->proto;
-        }
-        
-        /* Copy payload */
-        memcpy((uint8_t *) data + hdr_size, packet->data + offs, xfer_size);
-        
-        *rdata = data;
-        *rsize = size;
-        *roffs = rem_offs;
-        
-        return EOK;
-}
-
-/** Decode IPv4 datagram
- *
- * @param data   Serialized IPv4 datagram
- * @param size   Length of serialized IPv4 datagram
- * @param packet IP datagram structure to be filled
- *
- * @return EOK on success
- * @return EINVAL if the datagram is invalid or damaged
- * @return ENOMEM if not enough memory
- *
- */
 int inet_pdu_decode(void *data, size_t size, inet_packet_t *packet)
 {
+        ip_header_t *hdr;
+        size_t tot_len;
+        size_t data_offs;
+        uint8_t version;
+        uint16_t ident;
+        uint16_t flags_foff;
+        uint16_t foff;
+
         log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_pdu_decode()");
-        
+
         if (size < sizeof(ip_header_t)) {
                 log_msg(LOG_DEFAULT, LVL_DEBUG, "PDU too short (%zu)", size);
                 return EINVAL;
         }
-        
-        ip_header_t *hdr = (ip_header_t *) data;
-        
-        uint8_t version = BIT_RANGE_EXTRACT(uint8_t, VI_VERSION_h,
-            VI_VERSION_l, hdr->ver_ihl);
+
+        hdr = (ip_header_t *)data;
+
+        version = BIT_RANGE_EXTRACT(uint8_t, VI_VERSION_h, VI_VERSION_l,
+            hdr->ver_ihl);
         if (version != 4) {
                 log_msg(LOG_DEFAULT, LVL_DEBUG, "Version (%d) != 4", version);
                 return EINVAL;
         }
-        
-        size_t tot_len = uint16_t_be2host(hdr->tot_len);
+
+        tot_len = uint16_t_be2host(hdr->tot_len);
         if (tot_len < sizeof(ip_header_t)) {
                 log_msg(LOG_DEFAULT, LVL_DEBUG, "Total Length too small (%zu)", tot_len);
                 return EINVAL;
         }
-        
+
         if (tot_len > size) {
                 log_msg(LOG_DEFAULT, LVL_DEBUG, "Total Length = %zu > PDU size = %zu",
-                    tot_len, size);
-                return EINVAL;
-        }
-        
-        uint16_t ident = uint16_t_be2host(hdr->id);
-        uint16_t flags_foff = uint16_t_be2host(hdr->flags_foff);
-        uint16_t foff = BIT_RANGE_EXTRACT(uint16_t, FF_FRAGOFF_h, FF_FRAGOFF_l,
+                        tot_len, size);
+                return EINVAL;
+        }
+
+        ident = uint16_t_be2host(hdr->id);
+        flags_foff = uint16_t_be2host(hdr->flags_foff);
+        foff = BIT_RANGE_EXTRACT(uint16_t, FF_FRAGOFF_h, FF_FRAGOFF_l,
             flags_foff);
         /* XXX Checksum */
-        
-        inet_addr_set(uint32_t_be2host(hdr->src_addr), &packet->src);
-        inet_addr_set(uint32_t_be2host(hdr->dest_addr), &packet->dest);
+
+        packet->src.ipv4 = uint32_t_be2host(hdr->src_addr);
+        packet->dest.ipv4 = uint32_t_be2host(hdr->dest_addr);
         packet->tos = hdr->tos;
         packet->proto = hdr->proto;
         packet->ttl = hdr->ttl;
         packet->ident = ident;
-        
+
         packet->df = (flags_foff & BIT_V(uint16_t, FF_FLAG_DF)) != 0;
         packet->mf = (flags_foff & BIT_V(uint16_t, FF_FLAG_MF)) != 0;
         packet->offs = foff * FRAG_OFFS_UNIT;
-        
+
         /* XXX IP options */
-        size_t data_offs = sizeof(uint32_t) *
-            BIT_RANGE_EXTRACT(uint8_t, VI_IHL_h, VI_IHL_l, hdr->ver_ihl);
-        
+        data_offs = sizeof(uint32_t) * BIT_RANGE_EXTRACT(uint8_t, VI_IHL_h,
+            VI_IHL_l, hdr->ver_ihl);
+
         packet->size = tot_len - data_offs;
         packet->data = calloc(packet->size, 1);
@@ -365 +259 @@
                 return ENOMEM;
         }
-        
-        memcpy(packet->data, (uint8_t *) data + data_offs, packet->size);
-        
+
+        memcpy(packet->data, (uint8_t *)data + data_offs, packet->size);
+
         return EOK;
 }
 
-/** Decode IPv6 datagram
- *
- * @param data   Serialized IPv6 datagram
- * @param size   Length of serialized IPv6 datagram
- * @param packet IP datagram structure to be filled
- *
- * @return EOK on success
- * @return EINVAL if the datagram is invalid or damaged
- * @return ENOMEM if not enough memory
- *
- */
-int inet_pdu_decode6(void *data, size_t size, inet_packet_t *packet)
-{
-        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_pdu_decode6()");
-        
-        if (size < sizeof(ip6_header_t)) {
-                log_msg(LOG_DEFAULT, LVL_DEBUG, "PDU too short (%zu)", size);
-                return EINVAL;
-        }
-        
-        ip6_header_t *hdr6 = (ip6_header_t *) data;
-        
-        uint8_t version = BIT_RANGE_EXTRACT(uint8_t, VI_VERSION_h,
-            VI_VERSION_l, hdr6->ver_tc);
-        if (version != 6) {
-                log_msg(LOG_DEFAULT, LVL_DEBUG, "Version (%d) != 6", version);
-                return EINVAL;
-        }
-        
-        size_t payload_len = uint16_t_be2host(hdr6->payload_len);
-        if (payload_len + sizeof(ip6_header_t) > size) {
-                log_msg(LOG_DEFAULT, LVL_DEBUG, "Payload Length = %zu > PDU size = %zu",
-                    payload_len + sizeof(ip6_header_t), size);
-                return EINVAL;
-        }
-        
-        uint32_t ident;
-        uint16_t offsmf;
-        uint16_t foff;
-        uint16_t next;
-        size_t data_offs = sizeof(ip6_header_t);
-        
-        /* Fragment extension header */
-        if (hdr6->next == IP6_NEXT_FRAGMENT) {
-                ip6_header_fragment_t *hdr6f = (ip6_header_fragment_t *)
-                    (hdr6 + 1);
-                
-                ident = uint32_t_be2host(hdr6f->id);
-                offsmf = uint16_t_be2host(hdr6f->offsmf);
-                foff = BIT_RANGE_EXTRACT(uint16_t, OF_FRAGOFF_h, OF_FRAGOFF_l,
-                    offsmf);
-                next = hdr6f->next;
-                data_offs += sizeof(ip6_header_fragment_t);
-                payload_len -= sizeof(ip6_header_fragment_t);
-        } else {
-                ident = 0;
-                offsmf = 0;
-                foff = 0;
-                next = hdr6->next;
-        }
-        
-        addr128_t src;
-        addr128_t dest;
-        
-        addr128_t_be2host(hdr6->src_addr, src);
-        inet_addr_set6(src, &packet->src);
-        
-        addr128_t_be2host(hdr6->dest_addr, dest);
-        inet_addr_set6(dest, &packet->dest);
-        
-        packet->tos = 0;
-        packet->proto = next;
-        packet->ttl = hdr6->hop_limit;
-        packet->ident = ident;
-        
-        packet->df = 1;
-        packet->mf = (offsmf & BIT_V(uint16_t, OF_FLAG_M)) != 0;
-        packet->offs = foff * FRAG_OFFS_UNIT;
-        
-        packet->size = payload_len;
-        packet->data = calloc(packet->size, 1);
-        if (packet->data == NULL) {
-                log_msg(LOG_DEFAULT, LVL_WARN, "Out of memory.");
-                return ENOMEM;
-        }
-        
-        memcpy(packet->data, (uint8_t *) data + data_offs, packet->size);
-        
-        return EOK;
-}
-
-/** Encode NDP packet
- *
- * @param ndp   NDP packet structure to be serialized
- * @param dgram IPv6 datagram structure to be filled
- *
- * @return EOK on success
- *
- */
-int ndp_pdu_encode(ndp_packet_t *ndp, inet_dgram_t *dgram)
-{
-        inet_addr_set6(ndp->sender_proto_addr, &dgram->src);
-        inet_addr_set6(ndp->target_proto_addr, &dgram->dest);
-        dgram->tos = 0;
-        dgram->size = sizeof(icmpv6_message_t) + sizeof(ndp_message_t);
-        
-        dgram->data = calloc(1, dgram->size);
-        if (dgram->data == NULL)
-                return ENOMEM;
-        
-        icmpv6_message_t *icmpv6 = (icmpv6_message_t *) dgram->data;
-        
-        icmpv6->type = ndp->opcode;
-        icmpv6->code = 0;
-        memset(icmpv6->un.ndp.reserved, 0, 3);
-        
-        ndp_message_t *message = (ndp_message_t *) (icmpv6 + 1);
-        
-        if (ndp->opcode == ICMPV6_NEIGHBOUR_SOLICITATION) {
-                host2addr128_t_be(ndp->solicited_ip, message->target_address);
-                message->option = 1;
-                icmpv6->un.ndp.flags = 0;
-        } else {
-                host2addr128_t_be(ndp->sender_proto_addr, message->target_address);
-                message->option = 2;
-                icmpv6->un.ndp.flags = NDP_FLAG_OVERRIDE | NDP_FLAG_SOLICITED;
-        }
-        
-        message->length = 1;
-        addr48(ndp->sender_hw_addr, message->mac);
-        
-        icmpv6_phdr_t phdr;
-        
-        host2addr128_t_be(ndp->sender_proto_addr, phdr.src_addr);
-        host2addr128_t_be(ndp->target_proto_addr, phdr.dest_addr);
-        phdr.length = host2uint32_t_be(dgram->size);
-        memset(phdr.zeroes, 0, 3);
-        phdr.next = IP_PROTO_ICMPV6;
-        
-        uint16_t cs_phdr =
-            inet_checksum_calc(INET_CHECKSUM_INIT, &phdr,
-            sizeof(icmpv6_phdr_t));
-        
-        uint16_t cs_all = inet_checksum_calc(cs_phdr, dgram->data,
-            dgram->size);
-        
-        icmpv6->checksum = host2uint16_t_be(cs_all);
-        
-        return EOK;
-}
-
-/** Decode NDP packet
- *
- * @param dgram Incoming IPv6 datagram encapsulating NDP packet
- * @param ndp   NDP packet structure to be filled
- *
- * @return EOK on success
- * @return EINVAL if the Datagram is invalid
- *
- */
-int ndp_pdu_decode(inet_dgram_t *dgram, ndp_packet_t *ndp)
-{
-        uint16_t src_af = inet_addr_get(&dgram->src, NULL,
-            &ndp->sender_proto_addr);
-        if (src_af != AF_INET6)
-                return EINVAL;
-        
-        if (dgram->size < sizeof(icmpv6_message_t) + sizeof(ndp_message_t))
-                return EINVAL;
-        
-        icmpv6_message_t *icmpv6 = (icmpv6_message_t *) dgram->data;
-        
-        ndp->opcode = icmpv6->type;
-        
-        ndp_message_t *message = (ndp_message_t *) (icmpv6 + 1);
-        
-        addr128_t_be2host(message->target_address, ndp->target_proto_addr);
-        addr48(message->mac, ndp->sender_hw_addr);
-        
-        return EOK;
-}
-
 /** @}
  */