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/*
* netsniff-ng - the packet sniffing beast
* Subject to the GPL, version 2.
*/
#include <stddef.h>
#include <string.h>
#include <netinet/in.h>
#include <linux/if_ether.h>
#include "dev.h"
#include "xmalloc.h"
#include "trafgen_conf.h"
#include "trafgen_l2.h"
#include "trafgen_l3.h"
#include "trafgen_l4.h"
#include "trafgen_l7.h"
#include "trafgen_proto.h"
#define field_shift_and_mask(f, v) (((v) << (f)->shift) & \
((f)->mask ? (f)->mask : (0xffffffff)))
#define field_unmask_and_unshift(f, v) (((v) & \
((f)->mask ? (f)->mask : (0xffffffff))) >> (f)->shift)
struct ctx {
struct dev_io *dev;
};
static struct ctx ctx;
static const struct proto_ops *registered_ops[__PROTO_MAX];
struct packet *proto_hdr_packet(struct proto_hdr *hdr)
{
return packet_get(hdr->pkt_id);
}
struct proto_hdr *packet_last_header(struct packet *pkt)
{
struct proto_hdr **headers = &pkt->headers[0];
if (pkt->headers_count == 0)
return NULL;
return headers[pkt->headers_count - 1];
}
struct proto_hdr *proto_lower_header(struct proto_hdr *hdr)
{
struct packet *pkt = packet_get(hdr->pkt_id);
struct proto_hdr **headers = &pkt->headers[0];
if (hdr->index == 0)
return NULL;
return headers[hdr->index - 1];
}
struct proto_hdr *proto_upper_header(struct proto_hdr *hdr)
{
struct packet *pkt = packet_get(hdr->pkt_id);
struct proto_hdr **headers = &pkt->headers[0];
size_t headers_count = pkt->headers_count;
if (hdr->index == headers_count - 1)
return NULL;
return headers[hdr->index + 1];
}
uint8_t *proto_header_ptr(struct proto_hdr *hdr)
{
return &packet_get(hdr->pkt_id)->payload[hdr->pkt_offset];
}
static const struct proto_ops *proto_ops_by_id(enum proto_id id)
{
const struct proto_ops *ops = registered_ops[id];
bug_on(ops->id != id);
return ops;
}
void proto_ops_register(const struct proto_ops *ops)
{
bug_on(ops->id >= __PROTO_MAX);
registered_ops[ops->id] = ops;
}
static void proto_fields_realloc(struct proto_hdr *hdr, size_t count)
{
hdr->fields = xrealloc(hdr->fields, count * sizeof(*hdr->fields));
hdr->fields_count = count;
}
void proto_header_fields_add(struct proto_hdr *hdr,
const struct proto_field *fields, size_t count)
{
struct packet *pkt = packet_get(hdr->pkt_id);
struct proto_field *f;
int i;
if (pkt->headers_count > 0) {
struct proto_hdr *last = packet_last_header(pkt);
bug_on(!last);
hdr->pkt_offset = last->pkt_offset + last->len;
}
proto_fields_realloc(hdr, hdr->fields_count + count);
for (i = 0; count >= 1; count--, i++) {
int fill_len;
f = &hdr->fields[hdr->fields_count - count];
f->id = fields[i].id;
f->len = fields[i].len;
f->is_set = false;
f->shift = fields[i].shift;
f->mask = fields[i].mask;
f->pkt_offset = hdr->pkt_offset + fields[i].offset;
f->hdr = hdr;
if (!f->len)
continue;
fill_len = (f->pkt_offset + f->len) - (hdr->pkt_offset + hdr->len);
if (fill_len > 0) {
if (!pkt->is_created)
set_fill(0, (f->pkt_offset + f->len) - pkt->len);
hdr->len += f->len;
}
}
}
struct proto_field *proto_hdr_field_by_id(struct proto_hdr *hdr, uint32_t fid)
{
/* Assume the fields are stored in the same order as the respective
* enum, so the index can be used for faster lookup here.
*/
bug_on(hdr->fields[fid].id != fid);
return &hdr->fields[fid];
}
bool proto_hdr_field_is_set(struct proto_hdr *hdr, uint32_t fid)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
return field ? field->is_set : false;
}
struct proto_hdr *proto_packet_apply(enum proto_id pid, struct packet *pkt)
{
struct proto_hdr **headers = &pkt->headers[0];
const struct proto_ops *ops = proto_ops_by_id(pid);
struct proto_hdr *hdr;
bug_on(pkt->headers_count >= PROTO_MAX_LAYERS);
hdr = xzmalloc(sizeof(*hdr));
hdr->ops = ops;
hdr->pkt_id = pkt->id;
if (ops && ops->header_init)
ops->header_init(hdr);
/* This is very important to have it after header_init as
* pkt->headers_count might be changed by adding default lower headers */
hdr->index = pkt->headers_count;
headers[pkt->headers_count++] = hdr;
return hdr;
}
struct proto_hdr *proto_header_push(enum proto_id pid)
{
return proto_packet_apply(pid, current_packet());
}
void proto_header_finish(struct proto_hdr *hdr)
{
if (hdr && hdr->ops && hdr->ops->header_finish)
hdr->ops->header_finish(hdr);
}
enum proto_id proto_hdr_get_next_proto(struct proto_hdr *hdr)
{
if (hdr->ops && hdr->ops->get_next_proto)
return hdr->ops->get_next_proto(hdr);
return __PROTO_MAX;
}
struct proto_hdr *proto_hdr_push_sub_header(struct proto_hdr *hdr, int id)
{
struct proto_hdr *sub_hdr;
sub_hdr = xzmalloc(sizeof(struct proto_hdr));
sub_hdr->index = hdr->sub_headers_count;
sub_hdr->parent = hdr;
sub_hdr->id = id;
hdr->sub_headers_count++;
hdr->sub_headers = xrealloc(hdr->sub_headers,
hdr->sub_headers_count * sizeof(struct proto_hdr *));
hdr->sub_headers[hdr->sub_headers_count - 1] = sub_hdr;
if (hdr->ops->push_sub_header)
hdr->ops->push_sub_header(hdr, sub_hdr);
if (sub_hdr->ops->header_init)
sub_hdr->ops->header_init(sub_hdr);
return sub_hdr;
}
static void __proto_hdr_set_offset(struct proto_hdr *hdr, uint16_t pkt_offset)
{
size_t i;
hdr->pkt_offset = pkt_offset;
for (i = 0; i < hdr->fields_count; i++) {
struct proto_field *f = &hdr->fields[i];
f->pkt_offset = pkt_offset + f->offset;
}
}
void proto_hdr_move_sub_header(struct proto_hdr *hdr, struct proto_hdr *from,
struct proto_hdr *to)
{
struct proto_hdr *src_hdr, *dst_hdr, *tmp;
uint8_t *src_ptr, *dst_ptr;
uint16_t to_pkt_offset;
uint16_t to_index;
uint16_t pkt_offset;
int idx_shift;
size_t len = 0;
uint8_t *buf;
int i;
if (hdr->sub_headers_count < 2)
return;
if (from->index == to->index)
return;
buf = xmemdupz(proto_header_ptr(from), from->len);
to_pkt_offset = to->pkt_offset;
to_index = to->index;
if (from->index < to->index) {
src_hdr = hdr->sub_headers[from->index + 1];
dst_hdr = to;
src_ptr = proto_header_ptr(src_hdr);
dst_ptr = proto_header_ptr(from);
len = (to->pkt_offset + to->len) - src_hdr->pkt_offset;
pkt_offset = from->pkt_offset;
idx_shift = 1;
} else {
src_hdr = to;
dst_hdr = hdr->sub_headers[from->index - 1];
src_ptr = proto_header_ptr(src_hdr);
dst_ptr = src_ptr + from->len;
len = from->pkt_offset - to->pkt_offset;
pkt_offset = to->pkt_offset + from->len;
idx_shift = -1;
}
hdr->sub_headers[from->index] = to;
hdr->sub_headers[to->index] = from;
for (i = src_hdr->index; i <= dst_hdr->index; i++) {
tmp = hdr->sub_headers[i];
__proto_hdr_set_offset(tmp, pkt_offset);
pkt_offset += tmp->len;
}
for (i = src_hdr->index; i <= dst_hdr->index; i++)
hdr->sub_headers[i]->index = i + idx_shift;
memmove(dst_ptr, src_ptr, len);
from->pkt_offset = to_pkt_offset;
from->index = to_index;
memcpy(proto_header_ptr(from), buf, from->len);
xfree(buf);
}
struct proto_hdr *proto_lower_default_add(struct proto_hdr *upper,
enum proto_id pid)
{
struct packet *pkt = proto_hdr_packet(upper);
size_t headers_count = pkt->headers_count;
struct proto_hdr *current;
const struct proto_ops *ops;
if (headers_count > 0) {
current = pkt->headers[headers_count - 1];
ops = current->ops;
if (ops->layer >= proto_ops_by_id(pid)->layer)
goto set_proto;
if (ops->id == pid)
goto set_proto;
}
current = proto_header_push(pid);
ops = current->ops;
set_proto:
if (ops && ops->set_next_proto)
ops->set_next_proto(current, upper->ops->id);
return current;
}
static void __proto_field_relocate(struct proto_field *field)
{
struct proto_hdr *hdr = field->hdr;
struct packet *pkt = packet_get(hdr->pkt_id);
uint8_t *from, *to;
int i;
/* If this is a last field then just calculate 'pkt_offset' */
if (field->id == hdr->fields_count - 1) {
field->pkt_offset = hdr->pkt_offset + hdr->len - field->len;
return;
}
/* Use 'pkt_offset' from the 1st real (len > 0) field after the
* 'target' one */
for (i = field->id + 1; i < hdr->fields_count; i++) {
if (hdr->fields[i].len == 0)
continue;
field->pkt_offset = hdr->fields[i].pkt_offset;
break;
}
/* Move payload of overlapped fields (each after the 'target' field) */
from = &pkt->payload[field->pkt_offset];
to = &pkt->payload[field->pkt_offset + field->len];
memcpy(to, from, hdr->len - field->len);
/* Recalculate 'pkt_offset' of the rest fields */
for (; i < hdr->fields_count; i++) {
struct proto_field *tmp = &hdr->fields[i];
if (tmp->len == 0)
continue;
tmp->pkt_offset += field->len;
}
}
static void __proto_field_set_bytes(struct proto_field *field,
const uint8_t *bytes, size_t len,
bool is_default, bool is_be)
{
uint8_t *payload, *p8;
uint16_t *p16;
uint32_t *p32;
uint32_t v32;
uint16_t v16;
uint8_t v8;
if (is_default && field->is_set)
return;
if (field->len == 0) {
field->hdr->len += len;
field->len = len;
set_fill(0, len);
__proto_field_relocate(field);
}
payload = &packet_get(field->hdr->pkt_id)->payload[field->pkt_offset];
if (field->len == 1) {
p8 = payload;
*p8 = field->mask ? *p8 & ~field->mask : *p8;
v8 = field_shift_and_mask(field, *bytes);
v8 = field->mask ? (v8 | *p8) : v8;
bytes = &v8;
} else if (field->len == 2) {
p16 = (uint16_t *)payload;
*p16 = be16_to_cpu(*p16);
*p16 = cpu_to_be16(field->mask ? *p16 & ~field->mask : *p16);
v16 = field_shift_and_mask(field, *(const uint16_t *)bytes);
v16 = is_be ? cpu_to_be16(v16) : v16;
v16 = field->mask ? (v16 | *p16) : v16;
bytes = (uint8_t *)&v16;
} else if (field->len == 4) {
p32 = (uint32_t *)payload;
*p32 = be32_to_cpu(*p32);
*p32 = cpu_to_be32(field->mask ? *p32 & ~field->mask : *p32);
v32 = field_shift_and_mask(field, *(const uint32_t *)bytes);
v32 = is_be ? cpu_to_be32(v32) : v32;
v32 = field->mask ? (v32 | *p32) : v32;
bytes = (uint8_t *)&v32;
}
memcpy(payload, bytes, field->len);
if (!is_default)
field->is_set = true;
}
void proto_hdr_field_set_bytes(struct proto_hdr *hdr, uint32_t fid,
const uint8_t *bytes, size_t len)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, bytes, len, false, false);
}
static uint8_t *__proto_field_get_bytes(struct proto_field *field)
{
return &packet_get(field->hdr->pkt_id)->payload[field->pkt_offset];
}
uint8_t *proto_hdr_field_get_bytes(struct proto_hdr *hdr, uint32_t fid)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
return __proto_field_get_bytes(field);
}
void proto_hdr_field_set_u8(struct proto_hdr *hdr, uint32_t fid, uint8_t val)
{
proto_hdr_field_set_bytes(hdr, fid, (uint8_t *)&val, 1);
}
uint8_t proto_hdr_field_get_u8(struct proto_hdr *hdr, uint32_t fid)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
uint8_t val = *__proto_field_get_bytes(field);
return field_unmask_and_unshift(field, val);
}
void proto_hdr_field_set_u16(struct proto_hdr *hdr, uint32_t fid, uint16_t val)
{
proto_hdr_field_set_bytes(hdr, fid, (uint8_t *)&val, 2);
}
uint16_t proto_hdr_field_get_u16(struct proto_hdr *hdr, uint32_t fid)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
uint16_t val = *(uint16_t *)__proto_field_get_bytes(field);
return field_unmask_and_unshift(field, be16_to_cpu(val));
}
void proto_hdr_field_set_u32(struct proto_hdr *hdr, uint32_t fid, uint32_t val)
{
proto_hdr_field_set_bytes(hdr, fid, (uint8_t *)&val, 4);
}
uint32_t proto_hdr_field_get_u32(struct proto_hdr *hdr, uint32_t fid)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
uint32_t val = *(uint32_t *)__proto_field_get_bytes(field);
return field_unmask_and_unshift(field, be32_to_cpu(val));
}
uint32_t proto_hdr_field_get_be32(struct proto_hdr *hdr, uint32_t fid)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
uint32_t val = *(uint32_t *)__proto_field_get_bytes(field);
return field_unmask_and_unshift(field, val);
}
void proto_hdr_field_set_default_bytes(struct proto_hdr *hdr, uint32_t fid,
const uint8_t *bytes, size_t len)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, bytes, len, true, false);
}
void proto_hdr_field_set_default_u8(struct proto_hdr *hdr, uint32_t fid, uint8_t val)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, (uint8_t *)&val, 1, true, false);
}
void proto_hdr_field_set_default_u16(struct proto_hdr *hdr, uint32_t fid, uint16_t val)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, (uint8_t *)&val, 2, true, false);
}
void proto_hdr_field_set_default_u32(struct proto_hdr *hdr, uint32_t fid, uint32_t val)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, (uint8_t *)&val, 4, true, false);
}
void proto_hdr_field_set_be16(struct proto_hdr *hdr, uint32_t fid, uint16_t val)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, (uint8_t *)&val, 2, false, true);
}
void proto_hdr_field_set_be32(struct proto_hdr *hdr, uint32_t fid, uint32_t val)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, (uint8_t *)&val, 4, false, true);
}
void proto_hdr_field_set_default_be16(struct proto_hdr *hdr, uint32_t fid, uint16_t val)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, (uint8_t *)&val, 2, true, true);
}
void proto_hdr_field_set_default_be32(struct proto_hdr *hdr, uint32_t fid, uint32_t val)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
__proto_field_set_bytes(field, (uint8_t *)&val, 4, true, true);
}
static void __proto_hdr_field_set_dev_mac(struct proto_hdr *hdr, uint32_t fid,
bool is_default)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
uint8_t mac[ETH_ALEN];
int ret;
if (proto_hdr_field_is_set(hdr, fid))
return;
if (dev_io_is_netdev(ctx.dev)) {
ret = device_hw_address(dev_io_name_get(ctx.dev), mac, sizeof(mac));
if (ret < 0)
panic("Could not get device hw address\n");
__proto_field_set_bytes(field, mac, 6, is_default, false);
}
}
void proto_hdr_field_set_dev_mac(struct proto_hdr *hdr, uint32_t fid)
{
__proto_hdr_field_set_dev_mac(hdr, fid, false);
}
void proto_hdr_field_set_default_dev_mac(struct proto_hdr *hdr, uint32_t fid)
{
__proto_hdr_field_set_dev_mac(hdr, fid, true);
}
static void __proto_hdr_field_set_dev_ipv4(struct proto_hdr *hdr, uint32_t fid,
bool is_default)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
struct sockaddr_storage ss = { };
struct sockaddr_in *ss4;
int ret;
if (proto_hdr_field_is_set(hdr, fid))
return;
if (dev_io_is_netdev(ctx.dev)) {
ret = device_address(dev_io_name_get(ctx.dev), AF_INET, &ss);
if (ret < 0) {
fprintf(stderr, "Warning: Could not get device IPv4 address for %s\n",
dev_io_name_get(ctx.dev));
return;
}
ss4 = (struct sockaddr_in *) &ss;
__proto_field_set_bytes(field, (uint8_t *)&ss4->sin_addr.s_addr, 4, is_default, false);
}
}
void proto_hdr_field_set_dev_ipv4(struct proto_hdr *hdr, uint32_t fid)
{
__proto_hdr_field_set_dev_ipv4(hdr, fid, false);
}
void proto_hdr_field_set_default_dev_ipv4(struct proto_hdr *hdr, uint32_t fid)
{
__proto_hdr_field_set_dev_ipv4(hdr, fid, true);
}
static void __proto_hdr_field_set_dev_ipv6(struct proto_hdr *hdr, uint32_t fid,
bool is_default)
{
struct proto_field *field = proto_hdr_field_by_id(hdr, fid);
struct sockaddr_storage ss = { };
struct sockaddr_in6 *ss6;
int ret;
if (proto_hdr_field_is_set(hdr, fid))
return;
if (dev_io_is_netdev(ctx.dev)) {
ret = device_address(dev_io_name_get(ctx.dev), AF_INET6, &ss);
if (ret < 0) {
fprintf(stderr, "Warning: Could not get device IPv6 address for %s\n",
dev_io_name_get(ctx.dev));
return;
}
ss6 = (struct sockaddr_in6 *) &ss;
__proto_field_set_bytes(field, (uint8_t *)&ss6->sin6_addr.s6_addr, 16, is_default, false);
}
}
void proto_hdr_field_set_dev_ipv6(struct proto_hdr *hdr, uint32_t fid)
{
__proto_hdr_field_set_dev_ipv6(hdr, fid, false);
}
void proto_hdr_field_set_default_dev_ipv6(struct proto_hdr *hdr, uint32_t fid)
{
__proto_hdr_field_set_dev_ipv6(hdr, fid, true);
}
void proto_hdr_field_set_string(struct proto_hdr *hdr, uint32_t fid, const char *str)
{
proto_hdr_field_set_bytes(hdr, fid, (uint8_t *)str, strlen(str) + 1);
}
void proto_hdr_field_set_default_string(struct proto_hdr *hdr, uint32_t fid, const char *str)
{
proto_hdr_field_set_default_bytes(hdr, fid, (uint8_t *)str, strlen(str) + 1);
}
void proto_field_set_u8(struct proto_field *field, uint8_t val)
{
__proto_field_set_bytes(field, &val, 1, false, false);
}
uint8_t proto_field_get_u8(struct proto_field *field)
{
uint8_t val = *__proto_field_get_bytes(field);
return field_unmask_and_unshift(field, val);
}
void proto_field_set_u16(struct proto_field *field, uint16_t val)
{
__proto_field_set_bytes(field, (uint8_t *)&val, 2, false, false);
}
uint16_t proto_field_get_u16(struct proto_field *field)
{
uint16_t val = *(uint16_t *)__proto_field_get_bytes(field);
return field_unmask_and_unshift(field, be16_to_cpu(val));
}
void proto_field_set_u32(struct proto_field *field, uint32_t val)
{
__proto_field_set_bytes(field, (uint8_t *)&val, 4, false, false);
}
uint32_t proto_field_get_u32(struct proto_field *field)
{
uint32_t val = *(uint32_t *)__proto_field_get_bytes(field);
return field_unmask_and_unshift(field, be32_to_cpu(val));
}
uint32_t proto_field_get_be32(struct proto_field *field)
{
uint32_t val = *(uint32_t *)__proto_field_get_bytes(field);
return field_unmask_and_unshift(field, val);
}
void proto_field_set_be16(struct proto_field *field, uint16_t val)
{
__proto_field_set_bytes(field, (uint8_t *)&val, 2, false, true);
}
void proto_field_set_be32(struct proto_field *field, uint32_t val)
{
__proto_field_set_bytes(field, (uint8_t *)&val, 4, false, true);
}
void proto_field_set_bytes(struct proto_field *field, const uint8_t *bytes, size_t len)
{
__proto_field_set_bytes(field, bytes, len, false, false);
}
void proto_field_set_string(struct proto_field *field, const char *str)
{
proto_field_set_bytes(field, (uint8_t *)str, strlen(str) + 1);
}
void proto_field_set_default_string(struct proto_field *field, const char *str)
{
__proto_field_set_bytes(field, (uint8_t *)str, strlen(str) + 1, true, false);
}
void protos_init(struct dev_io *dev)
{
ctx.dev = dev;
protos_l2_init();
protos_l3_init();
protos_l4_init();
protos_l7_init();
}
void proto_packet_update(uint32_t idx)
{
struct packet *pkt = packet_get(idx);
ssize_t i;
for (i = pkt->headers_count - 1; i >= 0; i--) {
struct proto_hdr *hdr = pkt->headers[i];
if (hdr->ops->packet_update)
hdr->ops->packet_update(hdr);
}
}
void proto_packet_finish(void)
{
struct proto_hdr **headers = current_packet()->headers;
size_t headers_count = current_packet()->headers_count;
ssize_t i;
/* Go down from upper layers to do last calculations (checksum) */
for (i = headers_count - 1; i >= 0; i--) {
struct proto_hdr *hdr = headers[i];
const struct proto_ops *ops = hdr->ops;
if (ops && ops->packet_finish)
ops->packet_finish(hdr);
}
current_packet()->is_created = true;
}
static inline uint32_t field_inc(struct proto_field *field)
{
uint32_t min = field->func.min;
uint32_t max = field->func.max;
uint32_t val = field->func.val;
uint32_t inc = field->func.inc;
uint32_t next;
next = (val + inc) % (max + 1);
field->func.val = max(next, min);
return val;
}
static void field_inc_func(struct proto_field *field)
{
if (field->len == 1) {
proto_field_set_u8(field, field_inc(field));
} else if (field->len == 2) {
proto_field_set_be16(field, field_inc(field));
} else if (field->len == 4) {
proto_field_set_be32(field, field_inc(field));
} else if (field->len > 4) {
uint8_t *bytes = __proto_field_get_bytes(field);
bytes += field->len - 4;
*(uint32_t *)bytes = bswap_32(field_inc(field));
}
}
static inline uint32_t field_rand(struct proto_field *field)
{
return field->func.min + (rand() % ((field->func.max - field->func.min) + 1));
}
static void field_rnd_func(struct proto_field *field)
{
if (field->len == 1) {
proto_field_set_u8(field, (uint8_t) field_rand(field));
} else if (field->len == 2) {
proto_field_set_be16(field, (uint16_t) field_rand(field));
} else if (field->len == 4) {
proto_field_set_be32(field, (uint32_t) field_rand(field));
} else if (field->len > 4) {
uint8_t *bytes = __proto_field_get_bytes(field);
uint32_t i;
for (i = 0; i < field->len; i++)
bytes[i] = (uint8_t) field_rand(field);
}
}
void proto_field_func_add(struct proto_field *field,
struct proto_field_func *func)
{
bug_on(!func);
field->func.update_field = func->update_field;
field->func.type = func->type;
field->func.max = func->max ?: UINT32_MAX - 1;
field->func.min = func->min;
field->func.inc = func->inc;
if (func->type & PROTO_FIELD_FUNC_INC) {
if (func->type & PROTO_FIELD_FUNC_MIN)
field->func.val = func->min;
else if (field->len == 1)
field->func.val = proto_field_get_u8(field);
else if (field->len == 2)
field->func.val = proto_field_get_u16(field);
else if (field->len == 4)
field->func.val = proto_field_get_u32(field);
else if (field->len > 4) {
uint8_t *bytes = __proto_field_get_bytes(field);
bytes += field->len - 4;
field->func.val = bswap_32(*(uint32_t *)bytes);
}
field->func.update_field = field_inc_func;
} else if (func->type & PROTO_FIELD_FUNC_RND) {
field->func.update_field = field_rnd_func;
}
}
void proto_field_dyn_apply(struct proto_field *field)
{
if (field->func.update_field)
field->func.update_field(field);
if (field->hdr->ops->field_changed)
field->hdr->ops->field_changed(field);
}
struct dev_io *proto_dev_get(void)
{
return ctx.dev;
}
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