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Merge pull request #398 from teg/netlink-container-rework

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netlink container rework

Allocate containers as separate structs instead of individual arrays for each member field.
This commit is contained in:
David Herrmann 2015-06-30 22:15:55 +02:00
commit dfab39b017
2 changed files with 98 additions and 101 deletions
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25
src/libsystemd/sd-netlink/netlink-internal.h
View File

@ -92,18 +92,25 @@ struct sd_netlink {
sd_event *event;
};
struct netlink_attribute {
size_t offset; /* offset from hdr to attirubte */
};
struct netlink_container {
const struct NLTypeSystem *type_system; /* the type system of the container */
size_t offset; /* offset from hdr to the start of the container */
struct netlink_attribute *attributes;
unsigned short n_attributes; /* number of attributes in container */
};
struct sd_netlink_message {
RefCount n_ref;
sd_netlink *rtnl;
struct nlmsghdr *hdr;
const struct NLTypeSystem *(container_type_system[RTNL_CONTAINER_DEPTH]); /* the type of the container and all its parents */
size_t container_offsets[RTNL_CONTAINER_DEPTH]; /* offset from hdr to each container's start */
struct netlink_container containers[RTNL_CONTAINER_DEPTH];
unsigned n_containers; /* number of containers */
size_t next_rta_offset; /* offset from hdr to next rta */
size_t *rta_offset_tb[RTNL_CONTAINER_DEPTH];
unsigned short rta_tb_size[RTNL_CONTAINER_DEPTH];
bool sealed:1;
bool broadcast:1;
@ -122,14 +129,6 @@ int socket_read_message(sd_netlink *nl);
int rtnl_rqueue_make_room(sd_netlink *rtnl);
int rtnl_rqueue_partial_make_room(sd_netlink *rtnl);
int rtnl_message_read_internal(sd_netlink_message *m, unsigned short type, void **data);
int rtnl_message_parse(sd_netlink_message *m,
size_t **rta_offset_tb,
unsigned short *rta_tb_size,
int max,
struct rtattr *rta,
unsigned int rt_len);
/* Make sure callbacks don't destroy the rtnl connection */
#define RTNL_DONT_DESTROY(rtnl) \
_cleanup_netlink_unref_ _unused_ sd_netlink *_dont_destroy_##rtnl = sd_netlink_ref(rtnl)

174
src/libsystemd/sd-netlink/netlink-message.c
View File

@ -34,7 +34,7 @@
#include "netlink-internal.h"
#include "netlink-types.h"
#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL)
#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : NULL)
#define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
#define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK)
@ -88,7 +88,7 @@ int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) {
m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
type_get_type_system(nl_type, &m->container_type_system[0]);
type_get_type_system(nl_type, &m->containers[0].type_system);
m->hdr->nlmsg_len = size;
m->hdr->nlmsg_type = type;
@ -129,7 +129,7 @@ sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) {
free(m->hdr);
for (i = 0; i <= m->n_containers; i++)
free(m->rta_offset_tb[i]);
free(m->containers[i].attributes);
sd_netlink_message_unref(m->next);
@ -223,7 +223,7 @@ static int message_attribute_has_type(sd_netlink_message *m, size_t *out_size, u
assert(m);
r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type);
r = type_system_get_type(m->containers[m->n_containers].type_system, &type, attribute_type);
if (r < 0)
return r;
@ -406,18 +406,18 @@ int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type
if (r < 0)
return r;
r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type);
r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type);
if (r < 0)
return r;
r = type_system_union_protocol_get_type_system(type_system_union,
&m->container_type_system[m->n_containers + 1],
&m->containers[m->n_containers + 1].type_system,
family);
if (r < 0)
return r;
} else {
r = type_system_get_type_system(m->container_type_system[m->n_containers],
&m->container_type_system[m->n_containers + 1],
r = type_system_get_type_system(m->containers[m->n_containers].type_system,
&m->containers[m->n_containers + 1].type_system,
type);
if (r < 0)
return r;
@ -427,7 +427,7 @@ int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type
if (r < 0)
return r;
m->container_offsets[m->n_containers ++] = r;
m->containers[m->n_containers ++].offset = r;
return 0;
}
@ -439,12 +439,12 @@ int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned shor
assert_return(m, -EINVAL);
assert_return(!m->sealed, -EPERM);
r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type);
r = type_system_get_type_system_union(m->containers[m->n_containers].type_system, &type_system_union, type);
if (r < 0)
return r;
r = type_system_union_get_type_system(type_system_union,
&m->container_type_system[m->n_containers + 1],
&m->containers[m->n_containers + 1].type_system,
key);
if (r < 0)
return r;
@ -454,11 +454,11 @@ int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned shor
return r;
/* do we evere need non-null size */
r = add_rtattr(m, type, NULL, 0);
r = add_rtattr(m, type | NLA_F_NESTED, NULL, 0);
if (r < 0)
return r;
m->container_offsets[m->n_containers ++] = r;
m->containers[m->n_containers ++].offset = r;
return 0;
}
@ -469,26 +469,29 @@ int sd_netlink_message_close_container(sd_netlink_message *m) {
assert_return(!m->sealed, -EPERM);
assert_return(m->n_containers > 0, -EINVAL);
m->container_type_system[m->n_containers] = NULL;
m->containers[m->n_containers].type_system = NULL;
m->n_containers --;
return 0;
}
int rtnl_message_read_internal(sd_netlink_message *m, unsigned short type, void **data) {
static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data) {
struct netlink_attribute *attribute;
struct rtattr *rta;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(data, -EINVAL);
assert(m->n_containers <= RTNL_CONTAINER_DEPTH);
assert(m->rta_offset_tb[m->n_containers]);
assert(type < m->rta_tb_size[m->n_containers]);
assert(m->containers[m->n_containers].attributes);
assert(type < m->containers[m->n_containers].n_attributes);
if(!m->rta_offset_tb[m->n_containers][type])
attribute = &m->containers[m->n_containers].attributes[type];
if(!attribute->offset)
return -ENODATA;
rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]);
rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset);
*data = RTA_DATA(rta);
@ -505,7 +508,7 @@ int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, c
if (r < 0)
return r;
r = rtnl_message_read_internal(m, type, &attr_data);
r = netlink_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
else if (strnlen(attr_data, r) >= (size_t) r)
@ -527,7 +530,7 @@ int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8
if (r < 0)
return r;
r = rtnl_message_read_internal(m, type, &attr_data);
r = netlink_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
else if ((size_t) r < sizeof(uint8_t))
@ -549,7 +552,7 @@ int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint
if (r < 0)
return r;
r = rtnl_message_read_internal(m, type, &attr_data);
r = netlink_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
else if ((size_t) r < sizeof(uint16_t))
@ -571,7 +574,7 @@ int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint
if (r < 0)
return r;
r = rtnl_message_read_internal(m, type, &attr_data);
r = netlink_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
else if ((size_t)r < sizeof(uint32_t))
@ -593,7 +596,7 @@ int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short typ
if (r < 0)
return r;
r = rtnl_message_read_internal(m, type, &attr_data);
r = netlink_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
else if ((size_t)r < sizeof(struct ether_addr))
@ -615,7 +618,7 @@ int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short typ
if (r < 0)
return r;
r = rtnl_message_read_internal(m, type, &attr_data);
r = netlink_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
else if ((size_t)r < sizeof(struct ifa_cacheinfo))
@ -637,7 +640,7 @@ int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type,
if (r < 0)
return r;
r = rtnl_message_read_internal(m, type, &attr_data);
r = netlink_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
else if ((size_t)r < sizeof(struct in_addr))
@ -659,7 +662,7 @@ int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type,
if (r < 0)
return r;
r = rtnl_message_read_internal(m, type, &attr_data);
r = netlink_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
else if ((size_t)r < sizeof(struct in6_addr))
@ -671,6 +674,40 @@ int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type,
return 0;
}
static int netlink_container_parse(sd_netlink_message *m,
struct netlink_container *container,
int count,
struct rtattr *rta,
unsigned int rt_len) {
_cleanup_free_ struct netlink_attribute *attributes = NULL;
attributes = new0(struct netlink_attribute, count);
if(!attributes)
return -ENOMEM;
for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) {
unsigned short type;
type = RTA_TYPE(rta);
/* if the kernel is newer than the headers we used
when building, we ignore out-of-range attributes */
if (type >= count)
continue;
if (attributes[type].offset)
log_debug("rtnl: message parse - overwriting repeated attribute");
attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr;
}
container->attributes = attributes;
attributes = NULL;
container->n_attributes = count;
return 0;
}
int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type_id) {
const NLType *nl_type;
const NLTypeSystem *type_system;
@ -682,7 +719,7 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ
assert_return(m, -EINVAL);
assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL);
r = type_system_get_type(m->container_type_system[m->n_containers],
r = type_system_get_type(m->containers[m->n_containers].type_system,
&nl_type,
type_id);
if (r < 0)
@ -691,7 +728,7 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ
type = type_get_type(nl_type);
if (type == NETLINK_TYPE_NESTED) {
r = type_system_get_type_system(m->container_type_system[m->n_containers],
r = type_system_get_type_system(m->containers[m->n_containers].type_system,
&type_system,
type_id);
if (r < 0)
@ -699,7 +736,7 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ
} else if (type == NETLINK_TYPE_UNION) {
const NLTypeSystemUnion *type_system_union;
r = type_system_get_type_system_union(m->container_type_system[m->n_containers],
r = type_system_get_type_system_union(m->containers[m->n_containers].type_system,
&type_system_union,
type_id);
if (r < 0)
@ -744,7 +781,7 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ
} else
return -EINVAL;
r = rtnl_message_read_internal(m, type_id, &container);
r = netlink_message_read_internal(m, type_id, &container);
if (r < 0)
return r;
else
@ -752,18 +789,17 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ
m->n_containers ++;
r = rtnl_message_parse(m,
&m->rta_offset_tb[m->n_containers],
&m->rta_tb_size[m->n_containers],
type_system_get_count(type_system),
container,
size);
r = netlink_container_parse(m,
&m->containers[m->n_containers],
type_system_get_count(type_system),
container,
size);
if (r < 0) {
m->n_containers --;
return r;
}
m->container_type_system[m->n_containers] = type_system;
m->containers[m->n_containers].type_system = type_system;
return 0;
}
@ -773,9 +809,9 @@ int sd_netlink_message_exit_container(sd_netlink_message *m) {
assert_return(m->sealed, -EINVAL);
assert_return(m->n_containers > 0, -EINVAL);
free(m->rta_offset_tb[m->n_containers]);
m->rta_offset_tb[m->n_containers] = NULL;
m->container_type_system[m->n_containers] = NULL;
free(m->containers[m->n_containers].attributes);
m->containers[m->n_containers].attributes = NULL;
m->containers[m->n_containers].type_system = NULL;
m->n_containers --;
@ -810,41 +846,6 @@ int sd_netlink_message_get_errno(sd_netlink_message *m) {
return err->error;
}
int rtnl_message_parse(sd_netlink_message *m,
size_t **rta_offset_tb,
unsigned short *rta_tb_size,
int count,
struct rtattr *rta,
unsigned int rt_len) {
unsigned short type;
size_t *tb;
tb = new0(size_t, count);
if(!tb)
return -ENOMEM;
*rta_tb_size = count;
for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) {
type = RTA_TYPE(rta);
/* if the kernel is newer than the headers we used
when building, we ignore out-of-range attributes
*/
if (type >= count)
continue;
if (tb[type])
log_debug("rtnl: message parse - overwriting repeated attribute");
tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr;
}
*rta_offset_tb = tb;
return 0;
}
int sd_netlink_message_rewind(sd_netlink_message *m) {
const NLType *nl_type;
uint16_t type;
@ -859,15 +860,13 @@ int sd_netlink_message_rewind(sd_netlink_message *m) {
rtnl_message_seal(m);
for (i = 1; i <= m->n_containers; i++) {
free(m->rta_offset_tb[i]);
m->rta_offset_tb[i] = NULL;
m->rta_tb_size[i] = 0;
m->container_type_system[i] = NULL;
free(m->containers[i].attributes);
m->containers[i].attributes = NULL;
}
m->n_containers = 0;
if (m->rta_offset_tb[0]) {
if (m->containers[0].attributes) {
/* top-level attributes have already been parsed */
return 0;
}
@ -886,14 +885,13 @@ int sd_netlink_message_rewind(sd_netlink_message *m) {
type_get_type_system(nl_type, &type_system);
m->container_type_system[0] = type_system;
m->containers[0].type_system = type_system;
r = rtnl_message_parse(m,
&m->rta_offset_tb[m->n_containers],
&m->rta_tb_size[m->n_containers],
type_system_get_count(type_system),
(struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)),
NLMSG_PAYLOAD(m->hdr, size));
r = netlink_container_parse(m,
&m->containers[m->n_containers],
type_system_get_count(type_system),
(struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)),
NLMSG_PAYLOAD(m->hdr, size));
if (r < 0)
return r;
}