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path: root/src/libsystemd/sd-rtnl/rtnl-message.c
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Diffstat (limited to 'src/libsystemd/sd-rtnl/rtnl-message.c')
-rw-r--r--src/libsystemd/sd-rtnl/rtnl-message.c398
1 files changed, 217 insertions, 181 deletions
diff --git a/src/libsystemd/sd-rtnl/rtnl-message.c b/src/libsystemd/sd-rtnl/rtnl-message.c
index 23c8099c30..330f57f64c 100644
--- a/src/libsystemd/sd-rtnl/rtnl-message.c
+++ b/src/libsystemd/sd-rtnl/rtnl-message.c
@@ -24,6 +24,7 @@
#include <stdbool.h>
#include <unistd.h>
#include <linux/veth.h>
+#include <linux/if_bridge.h>
#include "util.h"
#include "refcnt.h"
@@ -34,8 +35,6 @@
#include "rtnl-internal.h"
#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL)
-#define NEXT_RTA(m) ((struct rtattr*)((uint8_t*)(m)->hdr + (m)->next_rta_offset))
-#define UPDATE_RTA(m, new) (m)->next_rta_offset = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
#define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, size_t initial_size) {
@@ -119,8 +118,6 @@ int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret,
rtm = NLMSG_DATA((*ret)->hdr);
- UPDATE_RTA(*ret, RTM_RTA(rtm));
-
rtm->rtm_family = rtm_family;
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
rtm->rtm_type = RTN_UNICAST;
@@ -183,8 +180,6 @@ int sd_rtnl_message_new_link(sd_rtnl *rtnl, sd_rtnl_message **ret,
ifi->ifi_family = AF_UNSPEC;
ifi->ifi_index = index;
- UPDATE_RTA(*ret, IFLA_RTA(ifi));
-
return 0;
}
@@ -263,8 +258,6 @@ int sd_rtnl_message_new_addr(sd_rtnl *rtnl, sd_rtnl_message **ret,
else if (family == AF_INET6)
ifa->ifa_prefixlen = 128;
- UPDATE_RTA(*ret, IFA_RTA(ifa));
-
return 0;
}
@@ -277,9 +270,14 @@ sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m) {
sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m) {
if (m && REFCNT_DEC(m->n_ref) <= 0) {
+ unsigned i;
+
sd_rtnl_unref(m->rtnl);
free(m->hdr);
- free(m->rta_offset_tb);
+
+ for (i = 0; i < m->n_containers; i++)
+ free(m->rta_offset_tb[i]);
+
free(m);
}
@@ -762,63 +760,19 @@ int sd_rtnl_message_close_container(sd_rtnl_message *m) {
return 0;
}
-int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data) {
- size_t remaining_size;
- uint16_t rtm_type;
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(m->sealed, -EPERM);
- assert_return(m->next_rta_offset, -EINVAL);
- assert_return(type, -EINVAL);
- assert_return(data, -EINVAL);
-
- /* only read until the end of the current container */
- if (m->n_containers)
- remaining_size = GET_CONTAINER(m, m->n_containers - 1)->rta_len -
- (m->next_rta_offset -
- m->container_offsets[m->n_containers - 1]);
- else
- remaining_size = m->hdr->nlmsg_len - m->next_rta_offset;
-
- if (!RTA_OK(NEXT_RTA(m), remaining_size))
- return 0;
-
- /* if we read a container, return its type, but do not enter it*/
- r = sd_rtnl_message_get_type(m, &rtm_type);
- if (r < 0)
- return r;
-
- *type = NEXT_RTA(m)->rta_type;
-
- if (rtnl_message_type_is_link(rtm_type) &&
- ((m->n_containers == 0 &&
- NEXT_RTA(m)->rta_type == IFLA_LINKINFO) ||
- (m->n_containers == 1 &&
- GET_CONTAINER(m, 0)->rta_type == IFLA_LINKINFO &&
- NEXT_RTA(m)->rta_type == IFLA_INFO_DATA)))
- *data = NULL;
- else
- *data = RTA_DATA(NEXT_RTA(m));
-
- UPDATE_RTA(m, RTA_NEXT(NEXT_RTA(m), remaining_size));
-
- return 1;
-}
-
int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data) {
struct rtattr *rta;
assert_return(m, -EINVAL);
assert_return(m->sealed, -EPERM);
assert_return(data, -EINVAL);
- assert_return(m->rta_offset_tb, -EINVAL);
- assert_return(type < m->rta_tb_size, -EINVAL);
+ assert_return(m->rta_offset_tb[m->n_containers], -EINVAL);
+ assert_return(type < m->rta_tb_size[m->n_containers], -EINVAL);
- if(!m->rta_offset_tb[type])
+ if(!m->rta_offset_tb[m->n_containers][type])
return -ENODATA;
- rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[type]);
+ rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]);
*data = RTA_DATA(rta);
@@ -934,19 +888,106 @@ int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struc
assert_return(data, -EINVAL);
r = rtnl_message_read_internal(m, type, &attr_data);
- if(r < 0)
+ if (r < 0)
return r;
+ else if ((size_t)r < sizeof(struct in6_addr))
+ return -EIO;
memcpy(data, attr_data, sizeof(struct in6_addr));
return 0;
}
+int sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type) {
+ uint16_t rtm_type;
+ unsigned short parent_type;
+ void *container;
+ size_t container_length;
+ int max, r;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL);
+
+ r = rtnl_message_read_internal(m, type, &container);
+ if (r < 0)
+ return r;
+ else
+ container_length = r;
+
+ r = sd_rtnl_message_get_type(m, &rtm_type);
+ if (r < 0)
+ return r;
+
+ if (rtnl_message_type_is_link(rtm_type)) {
+ switch (m->n_containers) {
+ case 0:
+ switch (type) {
+ case IFLA_LINKINFO:
+ max = IFLA_INFO_MAX;
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ case 1:
+ parent_type = GET_CONTAINER(m, 0)->rta_type;
+ switch (parent_type) {
+ case IFLA_LINKINFO:
+ switch (type) {
+ case IFLA_INFO_DATA: {
+ char *kind;
+
+ r = sd_rtnl_message_read_string(m, IFLA_INFO_KIND, &kind);
+ if (r < 0)
+ return r;
+
+ if (streq(kind, "vlan")) {
+ max = IFLA_VLAN_MAX;
+ } else if (streq(kind, "bridge")) {
+ max = IFLA_BRIDGE_MAX;
+ } else if (streq(kind, "veth")) {
+ max = VETH_INFO_MAX;
+ container = IFLA_RTA(container);
+ } else
+ return -ENOTSUP;
+
+ break;
+ }
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ }
+
+ r = rtnl_message_parse(m,
+ &m->rta_offset_tb[m->n_containers + 1],
+ &m->rta_tb_size[m->n_containers + 1],
+ max,
+ container,
+ container_length);
+ if (r < 0)
+ return r;
+
+ m->n_containers ++;
+
+ return 0;
+}
+
int sd_rtnl_message_exit_container(sd_rtnl_message *m) {
assert_return(m, -EINVAL);
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->n_containers --;
return 0;
@@ -973,27 +1014,6 @@ int sd_rtnl_message_get_errno(sd_rtnl_message *m) {
return err->error;
}
-int rtnl_message_seal(sd_rtnl *nl, sd_rtnl_message *m) {
- int r;
-
- assert(m);
- assert(m->hdr);
-
- if (m->sealed)
- return -EPERM;
-
- if (nl)
- m->hdr->nlmsg_seq = nl->serial++;
-
- m->sealed = true;
-
- r = sd_rtnl_message_rewind(m);
- if (r < 0)
- return r;
-
- return 0;
-}
-
static int message_receive_need(sd_rtnl *rtnl, size_t *need) {
assert(rtnl);
assert(need);
@@ -1069,15 +1089,15 @@ int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) {
* On failure, a negative error code is returned.
*/
int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret) {
- sd_rtnl_message *m;
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ struct nlmsghdr *new_hdr;
union {
struct sockaddr sa;
struct sockaddr_nl nl;
} addr;
socklen_t addr_len;
+ size_t need, len;
int r;
- ssize_t k;
- size_t need;
assert(nl);
assert(ret);
@@ -1090,149 +1110,165 @@ int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret) {
if (r < 0)
return r;
- /* don't allow sealing/appending to received messages */
- m->sealed = true;
-
addr_len = sizeof(addr);
- k = recvfrom(nl->fd, m->hdr, need,
+ r = recvfrom(nl->fd, m->hdr, need,
0, &addr.sa, &addr_len);
- if (k < 0)
- k = (errno == EAGAIN) ? 0 : -errno; /* no data */
- else if (k == 0)
- k = -ECONNRESET; /* connection was closed by the kernel */
+ if (r < 0)
+ return (errno == EAGAIN) ? 0 : -errno; /* no data */
+ else if (r == 0)
+ return -ECONNRESET; /* connection was closed by the kernel */
else if (addr_len != sizeof(addr.nl) ||
addr.nl.nl_family != AF_NETLINK)
- k = -EIO; /* not a netlink message */
+ return -EIO; /* not a netlink message */
else if (addr.nl.nl_pid != 0)
- k = 0; /* not from the kernel */
- else if ((size_t) k < sizeof(struct nlmsghdr) ||
- (size_t) k < m->hdr->nlmsg_len)
- k = -EIO; /* too small (we do accept too big though) */
+ return 0; /* not from the kernel */
+ else if ((size_t) r < sizeof(struct nlmsghdr) ||
+ (size_t) r < m->hdr->nlmsg_len)
+ return -EIO; /* too small (we do accept too big though) */
else if (m->hdr->nlmsg_pid && m->hdr->nlmsg_pid != nl->sockaddr.nl.nl_pid)
- k = 0; /* not broadcast and not for us */
-
- if (k > 0)
- switch (m->hdr->nlmsg_type) {
- /* check that the size matches the message type */
- case NLMSG_ERROR:
- if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
- k = -EIO;
- break;
- case RTM_NEWLINK:
- case RTM_SETLINK:
- case RTM_DELLINK:
- case RTM_GETLINK:
- if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg)))
- k = -EIO;
- else {
- struct ifinfomsg *ifi;
-
- ifi = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, IFLA_RTA(ifi));
-
- r = rtnl_message_parse(m,
- &m->rta_offset_tb,
- &m->rta_tb_size,
- IFLA_MAX,
- IFLA_RTA(ifi),
- IFLA_PAYLOAD(m->hdr));
-
- }
- break;
- case RTM_NEWADDR:
- case RTM_DELADDR:
- case RTM_GETADDR:
- if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifaddrmsg)))
- k = -EIO;
- else {
- struct ifaddrmsg *ifa;
+ return 0; /* not broadcast and not for us */
+ else
+ len = (size_t) r;
+
+ /* check that the size matches the message type */
+ switch (m->hdr->nlmsg_type) {
+
+ case NLMSG_ERROR:
+ if (len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
+ return -EIO;
+ break;
+
+ case RTM_NEWLINK:
+ case RTM_SETLINK:
+ case RTM_DELLINK:
+ case RTM_GETLINK:
+ if (len < NLMSG_LENGTH(sizeof(struct ifinfomsg)))
+ return -EIO;
+ break;
+
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ case RTM_GETADDR:
+ if (len < NLMSG_LENGTH(sizeof(struct ifaddrmsg)))
+ return -EIO;
+ break;
+ case RTM_NEWROUTE:
+ case RTM_DELROUTE:
+ case RTM_GETROUTE:
+ if (len < NLMSG_LENGTH(sizeof(struct rtmsg)))
+ return -EIO;
+ break;
+ case NLMSG_NOOP:
+ return 0;
+ default:
+ log_debug("sd-rtnl: ignored message with unknown type");
+ return 0;
+ }
- ifa = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, IFA_RTA(ifa));
-
- r = rtnl_message_parse(m,
- &m->rta_offset_tb,
- &m->rta_tb_size,
- IFA_MAX,
- IFA_RTA(ifa),
- IFA_PAYLOAD(m->hdr));
- }
- break;
- case RTM_NEWROUTE:
- case RTM_DELROUTE:
- case RTM_GETROUTE:
- if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtmsg)))
- k = -EIO;
- else {
- struct rtmsg *rtm;
+ /* we probably allocated way too much memory, give it back */
+ new_hdr = realloc(m->hdr, len);
+ if (!new_hdr)
+ return -ENOMEM;
+ m->hdr = new_hdr;
- rtm = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, RTM_RTA(rtm));
-
- r = rtnl_message_parse(m,
- &m->rta_offset_tb,
- &m->rta_tb_size,
- RTA_MAX,
- RTM_RTA(rtm),
- RTM_PAYLOAD(m->hdr));
- }
- break;
- case NLMSG_NOOP:
- k = 0;
- break;
- default:
- k = 0; /* ignoring message of unknown type */
- }
+ /* seal and parse the top-level message */
+ r = sd_rtnl_message_rewind(m);
+ if (r < 0)
+ return r;
- if (k <= 0)
- sd_rtnl_message_unref(m);
- else {
- /* we probably allocated way too much memory, give it back */
- m->hdr = realloc(m->hdr, m->hdr->nlmsg_len);
- *ret = m;
- }
+ *ret = m;
+ m = NULL;
- return k;
+ return len;
}
int sd_rtnl_message_rewind(sd_rtnl_message *m) {
struct ifinfomsg *ifi;
struct ifaddrmsg *ifa;
struct rtmsg *rtm;
+ unsigned i;
+ int r;
assert_return(m, -EINVAL);
- assert_return(m->sealed, -EPERM);
assert_return(m->hdr, -EINVAL);
+ /* don't allow appending to message once parsed */
+ if (!m->sealed)
+ 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->n_containers = 0;
+
+ if (m->rta_offset_tb[0]) {
+ /* top-level attributes have already been parsed */
+ return 0;
+ }
+
+ /* parse top-level attributes */
switch(m->hdr->nlmsg_type) {
+ case NLMSG_NOOP:
+ case NLMSG_ERROR:
+ break;
case RTM_NEWLINK:
case RTM_SETLINK:
case RTM_GETLINK:
case RTM_DELLINK:
ifi = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, IFLA_RTA(ifi));
+
+ r = rtnl_message_parse(m,
+ &m->rta_offset_tb[0],
+ &m->rta_tb_size[0],
+ IFLA_MAX,
+ IFLA_RTA(ifi),
+ IFLA_PAYLOAD(m->hdr));
+ if (r < 0)
+ return r;
break;
case RTM_NEWADDR:
case RTM_GETADDR:
case RTM_DELADDR:
ifa = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, IFA_RTA(ifa));
+
+ r = rtnl_message_parse(m,
+ &m->rta_offset_tb[0],
+ &m->rta_tb_size[0],
+ IFA_MAX,
+ IFA_RTA(ifa),
+ IFA_PAYLOAD(m->hdr));
+ if (r < 0)
+ return r;
break;
case RTM_NEWROUTE:
case RTM_GETROUTE:
case RTM_DELROUTE:
rtm = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, RTM_RTA(rtm));
+
+ r = rtnl_message_parse(m,
+ &m->rta_offset_tb[0],
+ &m->rta_tb_size[0],
+ RTA_MAX,
+ RTM_RTA(rtm),
+ RTM_PAYLOAD(m->hdr));
break;
default:
return -ENOTSUP;
}
- m->n_containers = 0;
-
return 0;
}
+
+void rtnl_message_seal(sd_rtnl_message *m) {
+ assert(m);
+ assert(!m->sealed);
+
+ m->sealed = true;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-09 17:25:19 +0000