qemu/hw/net/net_rx_pkt.c

602 lines
15 KiB
C

/*
* QEMU RX packets abstractions
*
* Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
*
* Developed by Daynix Computing LTD (http://www.daynix.com)
*
* Authors:
* Dmitry Fleytman <dmitry@daynix.com>
* Tamir Shomer <tamirs@daynix.com>
* Yan Vugenfirer <yan@daynix.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "trace.h"
#include "net_rx_pkt.h"
#include "net/checksum.h"
#include "net/tap.h"
struct NetRxPkt {
struct virtio_net_hdr virt_hdr;
uint8_t ehdr_buf[sizeof(struct eth_header) + sizeof(struct vlan_header)];
struct iovec *vec;
uint16_t vec_len_total;
uint16_t vec_len;
uint32_t tot_len;
uint16_t tci;
size_t ehdr_buf_len;
bool has_virt_hdr;
eth_pkt_types_e packet_type;
/* Analysis results */
bool isip4;
bool isip6;
bool isudp;
bool istcp;
size_t l3hdr_off;
size_t l4hdr_off;
size_t l5hdr_off;
eth_ip6_hdr_info ip6hdr_info;
eth_ip4_hdr_info ip4hdr_info;
eth_l4_hdr_info l4hdr_info;
};
void net_rx_pkt_init(struct NetRxPkt **pkt, bool has_virt_hdr)
{
struct NetRxPkt *p = g_malloc0(sizeof *p);
p->has_virt_hdr = has_virt_hdr;
p->vec = NULL;
p->vec_len_total = 0;
*pkt = p;
}
void net_rx_pkt_uninit(struct NetRxPkt *pkt)
{
if (pkt->vec_len_total != 0) {
g_free(pkt->vec);
}
g_free(pkt);
}
struct virtio_net_hdr *net_rx_pkt_get_vhdr(struct NetRxPkt *pkt)
{
assert(pkt);
return &pkt->virt_hdr;
}
static inline void
net_rx_pkt_iovec_realloc(struct NetRxPkt *pkt,
int new_iov_len)
{
if (pkt->vec_len_total < new_iov_len) {
g_free(pkt->vec);
pkt->vec = g_malloc(sizeof(*pkt->vec) * new_iov_len);
pkt->vec_len_total = new_iov_len;
}
}
static void
net_rx_pkt_pull_data(struct NetRxPkt *pkt,
const struct iovec *iov, int iovcnt,
size_t ploff)
{
uint32_t pllen = iov_size(iov, iovcnt) - ploff;
if (pkt->ehdr_buf_len) {
net_rx_pkt_iovec_realloc(pkt, iovcnt + 1);
pkt->vec[0].iov_base = pkt->ehdr_buf;
pkt->vec[0].iov_len = pkt->ehdr_buf_len;
pkt->tot_len = pllen + pkt->ehdr_buf_len;
pkt->vec_len = iov_copy(pkt->vec + 1, pkt->vec_len_total - 1,
iov, iovcnt, ploff, pllen) + 1;
} else {
net_rx_pkt_iovec_realloc(pkt, iovcnt);
pkt->tot_len = pllen;
pkt->vec_len = iov_copy(pkt->vec, pkt->vec_len_total,
iov, iovcnt, ploff, pkt->tot_len);
}
eth_get_protocols(pkt->vec, pkt->vec_len, &pkt->isip4, &pkt->isip6,
&pkt->isudp, &pkt->istcp,
&pkt->l3hdr_off, &pkt->l4hdr_off, &pkt->l5hdr_off,
&pkt->ip6hdr_info, &pkt->ip4hdr_info, &pkt->l4hdr_info);
trace_net_rx_pkt_parsed(pkt->isip4, pkt->isip6, pkt->isudp, pkt->istcp,
pkt->l3hdr_off, pkt->l4hdr_off, pkt->l5hdr_off);
}
void net_rx_pkt_attach_iovec(struct NetRxPkt *pkt,
const struct iovec *iov, int iovcnt,
size_t iovoff, bool strip_vlan)
{
uint16_t tci = 0;
uint16_t ploff = iovoff;
assert(pkt);
if (strip_vlan) {
pkt->ehdr_buf_len = eth_strip_vlan(iov, iovcnt, iovoff, pkt->ehdr_buf,
&ploff, &tci);
} else {
pkt->ehdr_buf_len = 0;
}
pkt->tci = tci;
net_rx_pkt_pull_data(pkt, iov, iovcnt, ploff);
}
void net_rx_pkt_attach_iovec_ex(struct NetRxPkt *pkt,
const struct iovec *iov, int iovcnt,
size_t iovoff, bool strip_vlan,
uint16_t vet)
{
uint16_t tci = 0;
uint16_t ploff = iovoff;
assert(pkt);
if (strip_vlan) {
pkt->ehdr_buf_len = eth_strip_vlan_ex(iov, iovcnt, iovoff, vet,
pkt->ehdr_buf,
&ploff, &tci);
} else {
pkt->ehdr_buf_len = 0;
}
pkt->tci = tci;
net_rx_pkt_pull_data(pkt, iov, iovcnt, ploff);
}
void net_rx_pkt_dump(struct NetRxPkt *pkt)
{
#ifdef NET_RX_PKT_DEBUG
assert(pkt);
printf("RX PKT: tot_len: %d, ehdr_buf_len: %lu, vlan_tag: %d\n",
pkt->tot_len, pkt->ehdr_buf_len, pkt->tci);
#endif
}
void net_rx_pkt_set_packet_type(struct NetRxPkt *pkt,
eth_pkt_types_e packet_type)
{
assert(pkt);
pkt->packet_type = packet_type;
}
eth_pkt_types_e net_rx_pkt_get_packet_type(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->packet_type;
}
size_t net_rx_pkt_get_total_len(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->tot_len;
}
void net_rx_pkt_set_protocols(struct NetRxPkt *pkt, const void *data,
size_t len)
{
const struct iovec iov = {
.iov_base = (void *)data,
.iov_len = len
};
assert(pkt);
eth_get_protocols(&iov, 1, &pkt->isip4, &pkt->isip6,
&pkt->isudp, &pkt->istcp,
&pkt->l3hdr_off, &pkt->l4hdr_off, &pkt->l5hdr_off,
&pkt->ip6hdr_info, &pkt->ip4hdr_info, &pkt->l4hdr_info);
}
void net_rx_pkt_get_protocols(struct NetRxPkt *pkt,
bool *isip4, bool *isip6,
bool *isudp, bool *istcp)
{
assert(pkt);
*isip4 = pkt->isip4;
*isip6 = pkt->isip6;
*isudp = pkt->isudp;
*istcp = pkt->istcp;
}
size_t net_rx_pkt_get_l3_hdr_offset(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->l3hdr_off;
}
size_t net_rx_pkt_get_l4_hdr_offset(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->l4hdr_off;
}
size_t net_rx_pkt_get_l5_hdr_offset(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->l5hdr_off;
}
eth_ip6_hdr_info *net_rx_pkt_get_ip6_info(struct NetRxPkt *pkt)
{
return &pkt->ip6hdr_info;
}
eth_ip4_hdr_info *net_rx_pkt_get_ip4_info(struct NetRxPkt *pkt)
{
return &pkt->ip4hdr_info;
}
eth_l4_hdr_info *net_rx_pkt_get_l4_info(struct NetRxPkt *pkt)
{
return &pkt->l4hdr_info;
}
static inline void
_net_rx_rss_add_chunk(uint8_t *rss_input, size_t *bytes_written,
void *ptr, size_t size)
{
memcpy(&rss_input[*bytes_written], ptr, size);
trace_net_rx_pkt_rss_add_chunk(ptr, size, *bytes_written);
*bytes_written += size;
}
static inline void
_net_rx_rss_prepare_ip4(uint8_t *rss_input,
struct NetRxPkt *pkt,
size_t *bytes_written)
{
struct ip_header *ip4_hdr = &pkt->ip4hdr_info.ip4_hdr;
_net_rx_rss_add_chunk(rss_input, bytes_written,
&ip4_hdr->ip_src, sizeof(uint32_t));
_net_rx_rss_add_chunk(rss_input, bytes_written,
&ip4_hdr->ip_dst, sizeof(uint32_t));
}
static inline void
_net_rx_rss_prepare_ip6(uint8_t *rss_input,
struct NetRxPkt *pkt,
bool ipv6ex, size_t *bytes_written)
{
eth_ip6_hdr_info *ip6info = &pkt->ip6hdr_info;
_net_rx_rss_add_chunk(rss_input, bytes_written,
(ipv6ex && ip6info->rss_ex_src_valid) ? &ip6info->rss_ex_src
: &ip6info->ip6_hdr.ip6_src,
sizeof(struct in6_address));
_net_rx_rss_add_chunk(rss_input, bytes_written,
(ipv6ex && ip6info->rss_ex_dst_valid) ? &ip6info->rss_ex_dst
: &ip6info->ip6_hdr.ip6_dst,
sizeof(struct in6_address));
}
static inline void
_net_rx_rss_prepare_tcp(uint8_t *rss_input,
struct NetRxPkt *pkt,
size_t *bytes_written)
{
struct tcp_header *tcphdr = &pkt->l4hdr_info.hdr.tcp;
_net_rx_rss_add_chunk(rss_input, bytes_written,
&tcphdr->th_sport, sizeof(uint16_t));
_net_rx_rss_add_chunk(rss_input, bytes_written,
&tcphdr->th_dport, sizeof(uint16_t));
}
uint32_t
net_rx_pkt_calc_rss_hash(struct NetRxPkt *pkt,
NetRxPktRssType type,
uint8_t *key)
{
uint8_t rss_input[36];
size_t rss_length = 0;
uint32_t rss_hash = 0;
net_toeplitz_key key_data;
switch (type) {
case NetPktRssIpV4:
assert(pkt->isip4);
trace_net_rx_pkt_rss_ip4();
_net_rx_rss_prepare_ip4(&rss_input[0], pkt, &rss_length);
break;
case NetPktRssIpV4Tcp:
assert(pkt->isip4);
assert(pkt->istcp);
trace_net_rx_pkt_rss_ip4_tcp();
_net_rx_rss_prepare_ip4(&rss_input[0], pkt, &rss_length);
_net_rx_rss_prepare_tcp(&rss_input[0], pkt, &rss_length);
break;
case NetPktRssIpV6Tcp:
assert(pkt->isip6);
assert(pkt->istcp);
trace_net_rx_pkt_rss_ip6_tcp();
_net_rx_rss_prepare_ip6(&rss_input[0], pkt, true, &rss_length);
_net_rx_rss_prepare_tcp(&rss_input[0], pkt, &rss_length);
break;
case NetPktRssIpV6:
assert(pkt->isip6);
trace_net_rx_pkt_rss_ip6();
_net_rx_rss_prepare_ip6(&rss_input[0], pkt, false, &rss_length);
break;
case NetPktRssIpV6Ex:
assert(pkt->isip6);
trace_net_rx_pkt_rss_ip6_ex();
_net_rx_rss_prepare_ip6(&rss_input[0], pkt, true, &rss_length);
break;
default:
assert(false);
break;
}
net_toeplitz_key_init(&key_data, key);
net_toeplitz_add(&rss_hash, rss_input, rss_length, &key_data);
trace_net_rx_pkt_rss_hash(rss_length, rss_hash);
return rss_hash;
}
uint16_t net_rx_pkt_get_ip_id(struct NetRxPkt *pkt)
{
assert(pkt);
if (pkt->isip4) {
return be16_to_cpu(pkt->ip4hdr_info.ip4_hdr.ip_id);
}
return 0;
}
bool net_rx_pkt_is_tcp_ack(struct NetRxPkt *pkt)
{
assert(pkt);
if (pkt->istcp) {
return TCP_HEADER_FLAGS(&pkt->l4hdr_info.hdr.tcp) & TCP_FLAG_ACK;
}
return false;
}
bool net_rx_pkt_has_tcp_data(struct NetRxPkt *pkt)
{
assert(pkt);
if (pkt->istcp) {
return pkt->l4hdr_info.has_tcp_data;
}
return false;
}
struct iovec *net_rx_pkt_get_iovec(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->vec;
}
uint16_t net_rx_pkt_get_iovec_len(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->vec_len;
}
void net_rx_pkt_set_vhdr(struct NetRxPkt *pkt,
struct virtio_net_hdr *vhdr)
{
assert(pkt);
memcpy(&pkt->virt_hdr, vhdr, sizeof pkt->virt_hdr);
}
void net_rx_pkt_set_vhdr_iovec(struct NetRxPkt *pkt,
const struct iovec *iov, int iovcnt)
{
assert(pkt);
iov_to_buf(iov, iovcnt, 0, &pkt->virt_hdr, sizeof pkt->virt_hdr);
}
bool net_rx_pkt_is_vlan_stripped(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->ehdr_buf_len ? true : false;
}
bool net_rx_pkt_has_virt_hdr(struct NetRxPkt *pkt)
{
assert(pkt);
return pkt->has_virt_hdr;
}
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(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;
}