mirror of https://github.com/PentHertz/srsLTE.git
Removing broadcats hack. Returning to a simple TUN insterface on the MBMS-GW.
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badbb1de77
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e2e82cc464
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@ -285,8 +285,6 @@ mbms_gw::handle_sgi_md_pdu(srslte::byte_buffer_t *msg)
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{
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uint8_t version;
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srslte::gtpu_header_t header;
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in_addr_t baddr = inet_addr("172.16.0.255");
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in_addr_t saddr = inet_addr("172.16.0.254");
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//Setup GTP-U header
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header.flags = 0x30;
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@ -301,44 +299,14 @@ mbms_gw::handle_sgi_md_pdu(srslte::byte_buffer_t *msg)
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return;
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}
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//IP+UDP Headers
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//IP Headers
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struct iphdr *iph = (struct iphdr *) msg->msg;
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struct udphdr *udph = (struct udphdr *) (msg->msg + iph->ihl*4);
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if(iph->version != 4)
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{
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m_mbms_gw_log->warning("IPv6 not supported yet.\n");
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return;
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}
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//Replace Destination IP with broadcast address
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iph->daddr = baddr;
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//Replace Source IP with address in same subnet
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iph->saddr = saddr;
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//Replace IP cheksum
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iph->check = 0;
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iph->check = in_cksum((uint16_t*)msg->msg,4*(msg->msg[0] & 0x0F));
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//Set Pseudo Header
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struct pseudo_hdr phdr;
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phdr.src_addr = iph->saddr;
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phdr.dst_addr = iph->daddr;
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phdr.protocol = IPPROTO_UDP;
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phdr.placeholder = 0;
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phdr.udp_len = udph->len;
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//Set Pseudo Datagram
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udph->check = 0;
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int psize = sizeof(struct pseudo_hdr) + ntohs(udph->len);
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uint8_t * pseudo_dgram = (uint8_t*) malloc(psize);
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memcpy(pseudo_dgram, &phdr,sizeof(struct pseudo_hdr));
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memcpy(pseudo_dgram+sizeof(pseudo_hdr),udph,ntohs(udph->len));
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//Recompute UDP checksum
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udph->check = in_cksum((uint16_t*) pseudo_dgram, psize);
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free(pseudo_dgram);
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//Write GTP-U header into packet
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if(!srslte::gtpu_write_header(&header, msg))
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{
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@ -355,31 +323,4 @@ mbms_gw::handle_sgi_md_pdu(srslte::byte_buffer_t *msg)
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}
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}
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uint16_t
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mbms_gw::in_cksum(uint16_t *iphdr, int count)
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{
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//RFC 1071
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uint32_t sum = 0;
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uint16_t padd = 0;
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uint16_t result;
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while(count > 1)
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{
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sum+= *iphdr++;
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count -= 2;
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}
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if( count > 0 )
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{
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padd = * (uint8_t *) iphdr;
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sum += padd;
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}
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/*Fold 32-bit sum to 16-bit*/
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// while(sum>>16)
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// sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum>>16)+(sum & 0xFFFF);
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sum = sum + (sum >> 16);
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result = (uint16_t) ~sum;
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return result;
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}
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} //namespace srsepc
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