643 lines
17 KiB
C
643 lines
17 KiB
C
/*
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* QEMU RX packets abstractions
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*
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* Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
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*
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* Developed by Daynix Computing LTD (http://www.daynix.com)
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*
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* Authors:
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* Dmitry Fleytman <dmitry@daynix.com>
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* Tamir Shomer <tamirs@daynix.com>
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* Yan Vugenfirer <yan@daynix.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "trace.h"
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#include "net_rx_pkt.h"
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#include "net/checksum.h"
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#include "net/tap.h"
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struct NetRxPkt {
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struct virtio_net_hdr virt_hdr;
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uint8_t ehdr_buf[sizeof(struct eth_header) + sizeof(struct vlan_header)];
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struct iovec *vec;
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uint16_t vec_len_total;
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uint16_t vec_len;
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uint32_t tot_len;
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uint16_t tci;
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size_t ehdr_buf_len;
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bool has_virt_hdr;
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eth_pkt_types_e packet_type;
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/* Analysis results */
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bool isip4;
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bool isip6;
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bool isudp;
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bool istcp;
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size_t l3hdr_off;
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size_t l4hdr_off;
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size_t l5hdr_off;
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eth_ip6_hdr_info ip6hdr_info;
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eth_ip4_hdr_info ip4hdr_info;
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eth_l4_hdr_info l4hdr_info;
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};
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void net_rx_pkt_init(struct NetRxPkt **pkt, bool has_virt_hdr)
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{
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struct NetRxPkt *p = g_malloc0(sizeof *p);
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p->has_virt_hdr = has_virt_hdr;
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p->vec = NULL;
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p->vec_len_total = 0;
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*pkt = p;
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}
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void net_rx_pkt_uninit(struct NetRxPkt *pkt)
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{
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if (pkt->vec_len_total != 0) {
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g_free(pkt->vec);
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}
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g_free(pkt);
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}
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struct virtio_net_hdr *net_rx_pkt_get_vhdr(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return &pkt->virt_hdr;
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}
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static inline void
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net_rx_pkt_iovec_realloc(struct NetRxPkt *pkt,
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int new_iov_len)
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{
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if (pkt->vec_len_total < new_iov_len) {
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g_free(pkt->vec);
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pkt->vec = g_malloc(sizeof(*pkt->vec) * new_iov_len);
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pkt->vec_len_total = new_iov_len;
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}
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}
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static void
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net_rx_pkt_pull_data(struct NetRxPkt *pkt,
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const struct iovec *iov, int iovcnt,
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size_t ploff)
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{
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uint32_t pllen = iov_size(iov, iovcnt) - ploff;
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if (pkt->ehdr_buf_len) {
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net_rx_pkt_iovec_realloc(pkt, iovcnt + 1);
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pkt->vec[0].iov_base = pkt->ehdr_buf;
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pkt->vec[0].iov_len = pkt->ehdr_buf_len;
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pkt->tot_len = pllen + pkt->ehdr_buf_len;
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pkt->vec_len = iov_copy(pkt->vec + 1, pkt->vec_len_total - 1,
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iov, iovcnt, ploff, pllen) + 1;
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} else {
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net_rx_pkt_iovec_realloc(pkt, iovcnt);
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pkt->tot_len = pllen;
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pkt->vec_len = iov_copy(pkt->vec, pkt->vec_len_total,
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iov, iovcnt, ploff, pkt->tot_len);
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}
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eth_get_protocols(pkt->vec, pkt->vec_len, &pkt->isip4, &pkt->isip6,
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&pkt->isudp, &pkt->istcp,
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&pkt->l3hdr_off, &pkt->l4hdr_off, &pkt->l5hdr_off,
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&pkt->ip6hdr_info, &pkt->ip4hdr_info, &pkt->l4hdr_info);
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trace_net_rx_pkt_parsed(pkt->isip4, pkt->isip6, pkt->isudp, pkt->istcp,
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pkt->l3hdr_off, pkt->l4hdr_off, pkt->l5hdr_off);
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}
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void net_rx_pkt_attach_iovec(struct NetRxPkt *pkt,
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const struct iovec *iov, int iovcnt,
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size_t iovoff, bool strip_vlan)
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{
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uint16_t tci = 0;
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uint16_t ploff = iovoff;
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assert(pkt);
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if (strip_vlan) {
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pkt->ehdr_buf_len = eth_strip_vlan(iov, iovcnt, iovoff, pkt->ehdr_buf,
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&ploff, &tci);
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} else {
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pkt->ehdr_buf_len = 0;
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}
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pkt->tci = tci;
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net_rx_pkt_pull_data(pkt, iov, iovcnt, ploff);
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}
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void net_rx_pkt_attach_iovec_ex(struct NetRxPkt *pkt,
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const struct iovec *iov, int iovcnt,
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size_t iovoff, bool strip_vlan,
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uint16_t vet)
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{
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uint16_t tci = 0;
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uint16_t ploff = iovoff;
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assert(pkt);
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if (strip_vlan) {
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pkt->ehdr_buf_len = eth_strip_vlan_ex(iov, iovcnt, iovoff, vet,
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pkt->ehdr_buf,
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&ploff, &tci);
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} else {
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pkt->ehdr_buf_len = 0;
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}
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pkt->tci = tci;
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net_rx_pkt_pull_data(pkt, iov, iovcnt, ploff);
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}
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void net_rx_pkt_dump(struct NetRxPkt *pkt)
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{
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#ifdef NET_RX_PKT_DEBUG
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assert(pkt);
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printf("RX PKT: tot_len: %d, ehdr_buf_len: %lu, vlan_tag: %d\n",
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pkt->tot_len, pkt->ehdr_buf_len, pkt->tci);
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#endif
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}
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void net_rx_pkt_set_packet_type(struct NetRxPkt *pkt,
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eth_pkt_types_e packet_type)
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{
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assert(pkt);
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pkt->packet_type = packet_type;
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}
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eth_pkt_types_e net_rx_pkt_get_packet_type(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->packet_type;
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}
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size_t net_rx_pkt_get_total_len(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->tot_len;
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}
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void net_rx_pkt_set_protocols(struct NetRxPkt *pkt, const void *data,
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size_t len)
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{
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const struct iovec iov = {
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.iov_base = (void *)data,
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.iov_len = len
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};
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assert(pkt);
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eth_get_protocols(&iov, 1, &pkt->isip4, &pkt->isip6,
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&pkt->isudp, &pkt->istcp,
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&pkt->l3hdr_off, &pkt->l4hdr_off, &pkt->l5hdr_off,
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&pkt->ip6hdr_info, &pkt->ip4hdr_info, &pkt->l4hdr_info);
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}
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void net_rx_pkt_get_protocols(struct NetRxPkt *pkt,
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bool *isip4, bool *isip6,
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bool *isudp, bool *istcp)
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{
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assert(pkt);
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*isip4 = pkt->isip4;
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*isip6 = pkt->isip6;
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*isudp = pkt->isudp;
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*istcp = pkt->istcp;
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}
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size_t net_rx_pkt_get_l3_hdr_offset(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->l3hdr_off;
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}
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size_t net_rx_pkt_get_l4_hdr_offset(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->l4hdr_off;
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}
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size_t net_rx_pkt_get_l5_hdr_offset(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->l5hdr_off;
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}
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eth_ip6_hdr_info *net_rx_pkt_get_ip6_info(struct NetRxPkt *pkt)
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{
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return &pkt->ip6hdr_info;
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}
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eth_ip4_hdr_info *net_rx_pkt_get_ip4_info(struct NetRxPkt *pkt)
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{
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return &pkt->ip4hdr_info;
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}
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eth_l4_hdr_info *net_rx_pkt_get_l4_info(struct NetRxPkt *pkt)
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{
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return &pkt->l4hdr_info;
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}
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static inline void
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_net_rx_rss_add_chunk(uint8_t *rss_input, size_t *bytes_written,
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void *ptr, size_t size)
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{
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memcpy(&rss_input[*bytes_written], ptr, size);
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trace_net_rx_pkt_rss_add_chunk(ptr, size, *bytes_written);
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*bytes_written += size;
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}
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static inline void
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_net_rx_rss_prepare_ip4(uint8_t *rss_input,
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struct NetRxPkt *pkt,
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size_t *bytes_written)
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{
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struct ip_header *ip4_hdr = &pkt->ip4hdr_info.ip4_hdr;
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_net_rx_rss_add_chunk(rss_input, bytes_written,
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&ip4_hdr->ip_src, sizeof(uint32_t));
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_net_rx_rss_add_chunk(rss_input, bytes_written,
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&ip4_hdr->ip_dst, sizeof(uint32_t));
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}
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static inline void
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_net_rx_rss_prepare_ip6(uint8_t *rss_input,
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struct NetRxPkt *pkt,
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bool ipv6ex, size_t *bytes_written)
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{
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eth_ip6_hdr_info *ip6info = &pkt->ip6hdr_info;
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_net_rx_rss_add_chunk(rss_input, bytes_written,
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(ipv6ex && ip6info->rss_ex_src_valid) ? &ip6info->rss_ex_src
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: &ip6info->ip6_hdr.ip6_src,
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sizeof(struct in6_address));
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_net_rx_rss_add_chunk(rss_input, bytes_written,
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(ipv6ex && ip6info->rss_ex_dst_valid) ? &ip6info->rss_ex_dst
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: &ip6info->ip6_hdr.ip6_dst,
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sizeof(struct in6_address));
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}
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static inline void
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_net_rx_rss_prepare_tcp(uint8_t *rss_input,
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struct NetRxPkt *pkt,
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size_t *bytes_written)
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{
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struct tcp_header *tcphdr = &pkt->l4hdr_info.hdr.tcp;
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_net_rx_rss_add_chunk(rss_input, bytes_written,
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&tcphdr->th_sport, sizeof(uint16_t));
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_net_rx_rss_add_chunk(rss_input, bytes_written,
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&tcphdr->th_dport, sizeof(uint16_t));
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}
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static inline void
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_net_rx_rss_prepare_udp(uint8_t *rss_input,
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struct NetRxPkt *pkt,
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size_t *bytes_written)
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{
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struct udp_header *udphdr = &pkt->l4hdr_info.hdr.udp;
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_net_rx_rss_add_chunk(rss_input, bytes_written,
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&udphdr->uh_sport, sizeof(uint16_t));
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_net_rx_rss_add_chunk(rss_input, bytes_written,
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&udphdr->uh_dport, sizeof(uint16_t));
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}
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uint32_t
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net_rx_pkt_calc_rss_hash(struct NetRxPkt *pkt,
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NetRxPktRssType type,
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uint8_t *key)
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{
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uint8_t rss_input[36];
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size_t rss_length = 0;
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uint32_t rss_hash = 0;
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net_toeplitz_key key_data;
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switch (type) {
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case NetPktRssIpV4:
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assert(pkt->isip4);
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trace_net_rx_pkt_rss_ip4();
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_net_rx_rss_prepare_ip4(&rss_input[0], pkt, &rss_length);
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break;
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case NetPktRssIpV4Tcp:
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assert(pkt->isip4);
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assert(pkt->istcp);
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trace_net_rx_pkt_rss_ip4_tcp();
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_net_rx_rss_prepare_ip4(&rss_input[0], pkt, &rss_length);
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_net_rx_rss_prepare_tcp(&rss_input[0], pkt, &rss_length);
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break;
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case NetPktRssIpV6Tcp:
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assert(pkt->isip6);
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assert(pkt->istcp);
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trace_net_rx_pkt_rss_ip6_tcp();
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_net_rx_rss_prepare_ip6(&rss_input[0], pkt, false, &rss_length);
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_net_rx_rss_prepare_tcp(&rss_input[0], pkt, &rss_length);
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break;
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case NetPktRssIpV6:
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assert(pkt->isip6);
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trace_net_rx_pkt_rss_ip6();
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_net_rx_rss_prepare_ip6(&rss_input[0], pkt, false, &rss_length);
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break;
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case NetPktRssIpV6Ex:
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assert(pkt->isip6);
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trace_net_rx_pkt_rss_ip6_ex();
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_net_rx_rss_prepare_ip6(&rss_input[0], pkt, true, &rss_length);
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break;
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case NetPktRssIpV6TcpEx:
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assert(pkt->isip6);
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assert(pkt->istcp);
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trace_net_rx_pkt_rss_ip6_ex_tcp();
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_net_rx_rss_prepare_ip6(&rss_input[0], pkt, true, &rss_length);
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_net_rx_rss_prepare_tcp(&rss_input[0], pkt, &rss_length);
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break;
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case NetPktRssIpV4Udp:
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assert(pkt->isip4);
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assert(pkt->isudp);
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trace_net_rx_pkt_rss_ip4_udp();
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_net_rx_rss_prepare_ip4(&rss_input[0], pkt, &rss_length);
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_net_rx_rss_prepare_udp(&rss_input[0], pkt, &rss_length);
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break;
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case NetPktRssIpV6Udp:
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assert(pkt->isip6);
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assert(pkt->isudp);
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trace_net_rx_pkt_rss_ip6_udp();
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_net_rx_rss_prepare_ip6(&rss_input[0], pkt, false, &rss_length);
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_net_rx_rss_prepare_udp(&rss_input[0], pkt, &rss_length);
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break;
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case NetPktRssIpV6UdpEx:
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assert(pkt->isip6);
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assert(pkt->isudp);
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trace_net_rx_pkt_rss_ip6_ex_udp();
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_net_rx_rss_prepare_ip6(&rss_input[0], pkt, true, &rss_length);
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_net_rx_rss_prepare_udp(&rss_input[0], pkt, &rss_length);
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break;
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default:
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assert(false);
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break;
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}
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net_toeplitz_key_init(&key_data, key);
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net_toeplitz_add(&rss_hash, rss_input, rss_length, &key_data);
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trace_net_rx_pkt_rss_hash(rss_length, rss_hash);
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return rss_hash;
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}
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uint16_t net_rx_pkt_get_ip_id(struct NetRxPkt *pkt)
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{
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assert(pkt);
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if (pkt->isip4) {
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return be16_to_cpu(pkt->ip4hdr_info.ip4_hdr.ip_id);
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}
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return 0;
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}
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bool net_rx_pkt_is_tcp_ack(struct NetRxPkt *pkt)
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{
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assert(pkt);
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if (pkt->istcp) {
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return TCP_HEADER_FLAGS(&pkt->l4hdr_info.hdr.tcp) & TCP_FLAG_ACK;
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}
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return false;
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}
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bool net_rx_pkt_has_tcp_data(struct NetRxPkt *pkt)
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{
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assert(pkt);
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if (pkt->istcp) {
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return pkt->l4hdr_info.has_tcp_data;
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}
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return false;
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}
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struct iovec *net_rx_pkt_get_iovec(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->vec;
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}
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uint16_t net_rx_pkt_get_iovec_len(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->vec_len;
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}
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void net_rx_pkt_set_vhdr(struct NetRxPkt *pkt,
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struct virtio_net_hdr *vhdr)
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{
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assert(pkt);
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memcpy(&pkt->virt_hdr, vhdr, sizeof pkt->virt_hdr);
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}
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void net_rx_pkt_set_vhdr_iovec(struct NetRxPkt *pkt,
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const struct iovec *iov, int iovcnt)
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{
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assert(pkt);
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iov_to_buf(iov, iovcnt, 0, &pkt->virt_hdr, sizeof pkt->virt_hdr);
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}
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bool net_rx_pkt_is_vlan_stripped(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->ehdr_buf_len ? true : false;
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}
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bool net_rx_pkt_has_virt_hdr(struct NetRxPkt *pkt)
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{
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assert(pkt);
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return pkt->has_virt_hdr;
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}
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uint16_t net_rx_pkt_get_vlan_tag(struct NetRxPkt *pkt)
|
|
{
|
|
assert(pkt);
|
|
|
|
return pkt->tci;
|
|
}
|
|
|
|
bool net_rx_pkt_validate_l3_csum(struct NetRxPkt *pkt, bool *csum_valid)
|
|
{
|
|
uint32_t cntr;
|
|
uint16_t csum;
|
|
uint32_t csl;
|
|
|
|
trace_net_rx_pkt_l3_csum_validate_entry();
|
|
|
|
if (!pkt->isip4) {
|
|
trace_net_rx_pkt_l3_csum_validate_not_ip4();
|
|
return false;
|
|
}
|
|
|
|
csl = pkt->l4hdr_off - pkt->l3hdr_off;
|
|
|
|
cntr = net_checksum_add_iov(pkt->vec, pkt->vec_len,
|
|
pkt->l3hdr_off,
|
|
csl, 0);
|
|
|
|
csum = net_checksum_finish(cntr);
|
|
|
|
*csum_valid = (csum == 0);
|
|
|
|
trace_net_rx_pkt_l3_csum_validate_csum(pkt->l3hdr_off, csl,
|
|
cntr, csum, *csum_valid);
|
|
|
|
return true;
|
|
}
|
|
|
|
static uint16_t
|
|
_net_rx_pkt_calc_l4_csum(struct NetRxPkt *pkt)
|
|
{
|
|
uint32_t cntr;
|
|
uint16_t csum;
|
|
uint16_t csl;
|
|
uint32_t cso;
|
|
|
|
trace_net_rx_pkt_l4_csum_calc_entry();
|
|
|
|
if (pkt->isip4) {
|
|
if (pkt->isudp) {
|
|
csl = be16_to_cpu(pkt->l4hdr_info.hdr.udp.uh_ulen);
|
|
trace_net_rx_pkt_l4_csum_calc_ip4_udp();
|
|
} else {
|
|
csl = be16_to_cpu(pkt->ip4hdr_info.ip4_hdr.ip_len) -
|
|
IP_HDR_GET_LEN(&pkt->ip4hdr_info.ip4_hdr);
|
|
trace_net_rx_pkt_l4_csum_calc_ip4_tcp();
|
|
}
|
|
|
|
cntr = eth_calc_ip4_pseudo_hdr_csum(&pkt->ip4hdr_info.ip4_hdr,
|
|
csl, &cso);
|
|
trace_net_rx_pkt_l4_csum_calc_ph_csum(cntr, csl);
|
|
} else {
|
|
if (pkt->isudp) {
|
|
csl = be16_to_cpu(pkt->l4hdr_info.hdr.udp.uh_ulen);
|
|
trace_net_rx_pkt_l4_csum_calc_ip6_udp();
|
|
} else {
|
|
struct ip6_header *ip6hdr = &pkt->ip6hdr_info.ip6_hdr;
|
|
size_t full_ip6hdr_len = pkt->l4hdr_off - pkt->l3hdr_off;
|
|
size_t ip6opts_len = full_ip6hdr_len - sizeof(struct ip6_header);
|
|
|
|
csl = be16_to_cpu(ip6hdr->ip6_ctlun.ip6_un1.ip6_un1_plen) -
|
|
ip6opts_len;
|
|
trace_net_rx_pkt_l4_csum_calc_ip6_tcp();
|
|
}
|
|
|
|
cntr = eth_calc_ip6_pseudo_hdr_csum(&pkt->ip6hdr_info.ip6_hdr, csl,
|
|
pkt->ip6hdr_info.l4proto, &cso);
|
|
trace_net_rx_pkt_l4_csum_calc_ph_csum(cntr, csl);
|
|
}
|
|
|
|
cntr += net_checksum_add_iov(pkt->vec, pkt->vec_len,
|
|
pkt->l4hdr_off, csl, cso);
|
|
|
|
csum = net_checksum_finish_nozero(cntr);
|
|
|
|
trace_net_rx_pkt_l4_csum_calc_csum(pkt->l4hdr_off, csl, cntr, csum);
|
|
|
|
return csum;
|
|
}
|
|
|
|
bool net_rx_pkt_validate_l4_csum(struct NetRxPkt *pkt, bool *csum_valid)
|
|
{
|
|
uint16_t csum;
|
|
|
|
trace_net_rx_pkt_l4_csum_validate_entry();
|
|
|
|
if (!pkt->istcp && !pkt->isudp) {
|
|
trace_net_rx_pkt_l4_csum_validate_not_xxp();
|
|
return false;
|
|
}
|
|
|
|
if (pkt->isudp && (pkt->l4hdr_info.hdr.udp.uh_sum == 0)) {
|
|
trace_net_rx_pkt_l4_csum_validate_udp_with_no_checksum();
|
|
return false;
|
|
}
|
|
|
|
if (pkt->isip4 && pkt->ip4hdr_info.fragment) {
|
|
trace_net_rx_pkt_l4_csum_validate_ip4_fragment();
|
|
return false;
|
|
}
|
|
|
|
csum = _net_rx_pkt_calc_l4_csum(pkt);
|
|
|
|
*csum_valid = ((csum == 0) || (csum == 0xFFFF));
|
|
|
|
trace_net_rx_pkt_l4_csum_validate_csum(*csum_valid);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool net_rx_pkt_fix_l4_csum(struct NetRxPkt *pkt)
|
|
{
|
|
uint16_t csum = 0;
|
|
uint32_t l4_cso;
|
|
|
|
trace_net_rx_pkt_l4_csum_fix_entry();
|
|
|
|
if (pkt->istcp) {
|
|
l4_cso = offsetof(struct tcp_header, th_sum);
|
|
trace_net_rx_pkt_l4_csum_fix_tcp(l4_cso);
|
|
} else if (pkt->isudp) {
|
|
if (pkt->l4hdr_info.hdr.udp.uh_sum == 0) {
|
|
trace_net_rx_pkt_l4_csum_fix_udp_with_no_checksum();
|
|
return false;
|
|
}
|
|
l4_cso = offsetof(struct udp_header, uh_sum);
|
|
trace_net_rx_pkt_l4_csum_fix_udp(l4_cso);
|
|
} else {
|
|
trace_net_rx_pkt_l4_csum_fix_not_xxp();
|
|
return false;
|
|
}
|
|
|
|
if (pkt->isip4 && pkt->ip4hdr_info.fragment) {
|
|
trace_net_rx_pkt_l4_csum_fix_ip4_fragment();
|
|
return false;
|
|
}
|
|
|
|
/* Set zero to checksum word */
|
|
iov_from_buf(pkt->vec, pkt->vec_len,
|
|
pkt->l4hdr_off + l4_cso,
|
|
&csum, sizeof(csum));
|
|
|
|
/* Calculate L4 checksum */
|
|
csum = cpu_to_be16(_net_rx_pkt_calc_l4_csum(pkt));
|
|
|
|
/* Set calculated checksum to checksum word */
|
|
iov_from_buf(pkt->vec, pkt->vec_len,
|
|
pkt->l4hdr_off + l4_cso,
|
|
&csum, sizeof(csum));
|
|
|
|
trace_net_rx_pkt_l4_csum_fix_csum(pkt->l4hdr_off + l4_cso, csum);
|
|
|
|
return true;
|
|
}
|