X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibsystemd%2Fsd-rtnl%2Frtnl-message.c;h=484613351d6d7de2c1267634e5d7fde8b83e311c;hp=af8f8cf76286c03502889b7406ca2602b37a3b23;hb=8facc3498ed037f842891ff55d1f60fe834f4ba0;hpb=5d4795f3722911ccd7953c0cf112c1f7624ea834
diff --git a/src/libsystemd/sd-rtnl/rtnl-message.c b/src/libsystemd/sd-rtnl/rtnl-message.c
index af8f8cf76..484613351 100644
--- a/src/libsystemd/sd-rtnl/rtnl-message.c
+++ b/src/libsystemd/sd-rtnl/rtnl-message.c
@@ -19,7 +19,6 @@
along with systemd; If not, see .
***/
-#include
#include
#include
#include
@@ -27,43 +26,34 @@
#include "util.h"
#include "refcnt.h"
+#include "missing.h"
#include "sd-rtnl.h"
+#include "rtnl-util.h"
#include "rtnl-internal.h"
+#include "rtnl-types.h"
-struct sd_rtnl_message {
- RefCount n_ref;
+#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL)
+#define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
- struct nlmsghdr *hdr;
- size_t container_offset; /* offset from hdr to container start */
- size_t next_rta_offset; /* offset from hdr to next rta */
+#define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK)
- bool sealed:1;
-};
-
-#define CURRENT_CONTAINER(m) ((m)->container_offset ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offset) : 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;
-
-static int message_new(sd_rtnl_message **ret, size_t initial_size) {
+static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret) {
sd_rtnl_message *m;
assert_return(ret, -EINVAL);
- assert_return(initial_size >= sizeof(struct nlmsghdr), -EINVAL);
+
+ /* Note that 'rtnl' is currently unused, if we start using it internally
+ we must take care to avoid problems due to mutual references between
+ busses and their queued messages. See sd-bus.
+ */
m = new0(sd_rtnl_message, 1);
if (!m)
return -ENOMEM;
- m->hdr = malloc0(initial_size);
- if (!m->hdr) {
- free(m);
- return -ENOMEM;
- }
-
m->n_ref = REFCNT_INIT;
- m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
m->sealed = false;
*ret = m;
@@ -71,98 +61,268 @@ static int message_new(sd_rtnl_message **ret, size_t initial_size) {
return 0;
}
-int message_new_synthetic_error(int error, uint32_t serial, sd_rtnl_message **ret) {
- struct nlmsgerr *err;
+int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ const NLType *nl_type;
+ size_t size;
int r;
- assert(error <= 0);
+ r = type_system_get_type(NULL, &nl_type, type);
+ if (r < 0)
+ return r;
+
+ assert(nl_type->type == NLA_NESTED);
- r = message_new(ret, NLMSG_SPACE(sizeof(struct nlmsgerr)));
+ r = message_new_empty(rtnl, &m);
if (r < 0)
return r;
- (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
- (*ret)->hdr->nlmsg_type = NLMSG_ERROR;
- (*ret)->hdr->nlmsg_seq = serial;
+ size = NLMSG_SPACE(nl_type->size);
+
+ assert(size >= sizeof(struct nlmsghdr));
+ m->hdr = malloc0(size);
+ if (!m->hdr)
+ return -ENOMEM;
+
+ m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- err = NLMSG_DATA((*ret)->hdr);
+ m->container_type_system[0] = nl_type->type_system;
+ m->hdr->nlmsg_len = size;
+ m->hdr->nlmsg_type = type;
- err->error = error;
+ *ret = m;
+ m = NULL;
return 0;
}
-bool message_type_is_route(uint16_t type) {
- switch (type) {
- case RTM_NEWROUTE:
- case RTM_GETROUTE:
- case RTM_DELROUTE:
- return true;
- default:
- return false;
- }
+int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
+ struct rtmsg *rtm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+
+ rtm = NLMSG_DATA(m->hdr);
+
+ if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
+ (rtm->rtm_family == AF_INET6 && prefixlen > 128))
+ return -ERANGE;
+
+ rtm->rtm_dst_len = prefixlen;
+
+ return 0;
}
-bool message_type_is_link(uint16_t type) {
- switch (type) {
- case RTM_NEWLINK:
- case RTM_SETLINK:
- case RTM_GETLINK:
- case RTM_DELLINK:
- return true;
- default:
- return false;
- }
+int sd_rtnl_message_route_set_src_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
+ struct rtmsg *rtm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+
+ rtm = NLMSG_DATA(m->hdr);
+
+ if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
+ (rtm->rtm_family == AF_INET6 && prefixlen > 128))
+ return -ERANGE;
+
+ rtm->rtm_src_len = prefixlen;
+
+ return 0;
}
-bool message_type_is_addr(uint16_t type) {
- switch (type) {
- case RTM_NEWADDR:
- case RTM_GETADDR:
- case RTM_DELADDR:
- return true;
- default:
- return false;
- }
+int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope) {
+ struct rtmsg *rtm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+
+ rtm = NLMSG_DATA(m->hdr);
+
+ rtm->rtm_scope = scope;
+
+ return 0;
}
-int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
+int sd_rtnl_message_route_get_family(sd_rtnl_message *m, int *family) {
struct rtmsg *rtm;
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(family, -EINVAL);
+
rtm = NLMSG_DATA(m->hdr);
- rtm->rtm_dst_len = prefixlen;
+ *family = rtm->rtm_family;
return 0;
}
-int sd_rtnl_message_route_new(uint16_t nlmsg_type, unsigned char rtm_family,
- sd_rtnl_message **ret) {
+int sd_rtnl_message_route_get_dst_prefixlen(sd_rtnl_message *m, unsigned char *dst_len) {
+ struct rtmsg *rtm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(dst_len, -EINVAL);
+
+ rtm = NLMSG_DATA(m->hdr);
+
+ *dst_len = rtm->rtm_dst_len;
+
+ return 0;
+}
+
+int sd_rtnl_message_route_get_src_prefixlen(sd_rtnl_message *m, unsigned char *src_len) {
+ struct rtmsg *rtm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(src_len, -EINVAL);
+
+ rtm = NLMSG_DATA(m->hdr);
+
+ *src_len = rtm->rtm_src_len;
+
+ return 0;
+}
+
+int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret,
+ uint16_t nlmsg_type, int rtm_family,
+ unsigned char rtm_protocol) {
struct rtmsg *rtm;
int r;
- assert_return(message_type_is_route(nlmsg_type), -EINVAL);
- assert_return(rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
+ assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL);
+ assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) ||
+ rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
assert_return(ret, -EINVAL);
- r = message_new(ret, NLMSG_SPACE(sizeof(struct rtmsg)));
+ r = message_new(rtnl, ret, nlmsg_type);
if (r < 0)
return r;
- (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
- (*ret)->hdr->nlmsg_type = nlmsg_type;
if (nlmsg_type == RTM_NEWROUTE)
- (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+ (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
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;
rtm->rtm_table = RT_TABLE_MAIN;
- rtm->rtm_protocol = RTPROT_BOOT;
+ rtm->rtm_protocol = rtm_protocol;
+
+ return 0;
+}
+
+int sd_rtnl_message_neigh_set_flags(sd_rtnl_message *m, uint8_t flags) {
+ struct ndmsg *ndm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+
+ ndm = NLMSG_DATA(m->hdr);
+ ndm->ndm_flags |= flags;
+
+ return 0;
+}
+
+int sd_rtnl_message_neigh_set_state(sd_rtnl_message *m, uint16_t state) {
+ struct ndmsg *ndm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+
+ ndm = NLMSG_DATA(m->hdr);
+ ndm->ndm_state |= state;
+
+ return 0;
+}
+
+int sd_rtnl_message_neigh_get_flags(sd_rtnl_message *m, uint8_t *flags) {
+ struct ndmsg *ndm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+
+ ndm = NLMSG_DATA(m->hdr);
+ *flags = ndm->ndm_flags;
+
+ return 0;
+}
+
+int sd_rtnl_message_neigh_get_state(sd_rtnl_message *m, uint16_t *state) {
+ struct ndmsg *ndm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+
+ ndm = NLMSG_DATA(m->hdr);
+ *state = ndm->ndm_state;
+
+ return 0;
+}
+
+int sd_rtnl_message_neigh_get_family(sd_rtnl_message *m, int *family) {
+ struct ndmsg *ndm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(family, -EINVAL);
+
+ ndm = NLMSG_DATA(m->hdr);
+
+ *family = ndm->ndm_family;
+
+ return 0;
+}
+
+int sd_rtnl_message_neigh_get_ifindex(sd_rtnl_message *m, int *index) {
+ struct ndmsg *ndm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(index, -EINVAL);
+
+ ndm = NLMSG_DATA(m->hdr);
+
+ *index = ndm->ndm_ifindex;
+
+ return 0;
+}
+
+int sd_rtnl_message_new_neigh(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t nlmsg_type, int index, int ndm_family) {
+ struct ndmsg *ndm;
+ int r;
+
+ assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL);
+ assert_return(ndm_family == AF_INET ||
+ ndm_family == AF_INET6 ||
+ ndm_family == PF_BRIDGE, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ r = message_new(rtnl, ret, nlmsg_type);
+ if (r < 0)
+ return r;
+
+ if (nlmsg_type == RTM_NEWNEIGH)
+ (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
+
+ ndm = NLMSG_DATA((*ret)->hdr);
+
+ ndm->ndm_family = ndm_family;
+ ndm->ndm_ifindex = index;
return 0;
}
@@ -170,13 +330,15 @@ int sd_rtnl_message_route_new(uint16_t nlmsg_type, unsigned char rtm_family,
int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags, unsigned change) {
struct ifinfomsg *ifi;
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(change, -EINVAL);
+
ifi = NLMSG_DATA(m->hdr);
ifi->ifi_flags = flags;
- if (change)
- ifi->ifi_change = change;
- else
- ifi->ifi_change = 0xffffffff;
+ ifi->ifi_change = change;
return 0;
}
@@ -184,6 +346,10 @@ int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags, unsigned
int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) {
struct ifinfomsg *ifi;
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+
ifi = NLMSG_DATA(m->hdr);
ifi->ifi_type = type;
@@ -191,57 +357,223 @@ int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) {
return 0;
}
-int sd_rtnl_message_link_new(uint16_t nlmsg_type, int index, sd_rtnl_message **ret) {
+int sd_rtnl_message_link_set_family(sd_rtnl_message *m, unsigned family) {
+ struct ifinfomsg *ifi;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ ifi->ifi_family = family;
+
+ return 0;
+}
+
+int sd_rtnl_message_new_link(sd_rtnl *rtnl, sd_rtnl_message **ret,
+ uint16_t nlmsg_type, int index) {
struct ifinfomsg *ifi;
int r;
- assert_return(message_type_is_link(nlmsg_type), -EINVAL);
- assert_return(nlmsg_type == RTM_NEWLINK || index > 0, -EINVAL);
+ assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL);
+ assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL);
assert_return(ret, -EINVAL);
- r = message_new(ret, NLMSG_SPACE(sizeof(struct ifinfomsg)));
+ r = message_new(rtnl, ret, nlmsg_type);
if (r < 0)
return r;
- (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
- (*ret)->hdr->nlmsg_type = nlmsg_type;
if (nlmsg_type == RTM_NEWLINK)
- (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE;
+ (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
ifi = NLMSG_DATA((*ret)->hdr);
ifi->ifi_family = AF_UNSPEC;
ifi->ifi_index = index;
- UPDATE_RTA(*ret, IFLA_RTA(ifi));
+ return 0;
+}
+
+int sd_rtnl_message_request_dump(sd_rtnl_message *m, int dump) {
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(m->hdr->nlmsg_type == RTM_GETLINK ||
+ m->hdr->nlmsg_type == RTM_GETADDR ||
+ m->hdr->nlmsg_type == RTM_GETROUTE ||
+ m->hdr->nlmsg_type == RTM_GETNEIGH,
+ -EINVAL);
+
+ if (dump)
+ m->hdr->nlmsg_flags |= NLM_F_DUMP;
+ else
+ m->hdr->nlmsg_flags &= ~NLM_F_DUMP;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_set_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+
+ ifa = NLMSG_DATA(m->hdr);
+
+ if ((ifa->ifa_family == AF_INET && prefixlen > 32) ||
+ (ifa->ifa_family == AF_INET6 && prefixlen > 128))
+ return -ERANGE;
+
+ ifa->ifa_prefixlen = prefixlen;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_set_flags(sd_rtnl_message *m, unsigned char flags) {
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+
+ ifa = NLMSG_DATA(m->hdr);
+
+ ifa->ifa_flags = flags;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_set_scope(sd_rtnl_message *m, unsigned char scope) {
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+
+ ifa = NLMSG_DATA(m->hdr);
+
+ ifa->ifa_scope = scope;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_get_family(sd_rtnl_message *m, int *family) {
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(family, -EINVAL);
+
+ ifa = NLMSG_DATA(m->hdr);
+
+ *family = ifa->ifa_family;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_get_prefixlen(sd_rtnl_message *m, unsigned char *prefixlen) {
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(prefixlen, -EINVAL);
+
+ ifa = NLMSG_DATA(m->hdr);
+
+ *prefixlen = ifa->ifa_prefixlen;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_get_scope(sd_rtnl_message *m, unsigned char *scope) {
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(scope, -EINVAL);
+
+ ifa = NLMSG_DATA(m->hdr);
+
+ *scope = ifa->ifa_scope;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_get_flags(sd_rtnl_message *m, unsigned char *flags) {
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(flags, -EINVAL);
+
+ ifa = NLMSG_DATA(m->hdr);
+
+ *flags = ifa->ifa_flags;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_get_ifindex(sd_rtnl_message *m, int *ifindex) {
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(ifindex, -EINVAL);
+
+ ifa = NLMSG_DATA(m->hdr);
+
+ *ifindex = ifa->ifa_index;
return 0;
}
-int sd_rtnl_message_addr_new(uint16_t nlmsg_type, int index, unsigned char family, unsigned char prefixlen, unsigned char flags, unsigned char scope, sd_rtnl_message **ret) {
+int sd_rtnl_message_new_addr(sd_rtnl *rtnl, sd_rtnl_message **ret,
+ uint16_t nlmsg_type, int index,
+ int family) {
struct ifaddrmsg *ifa;
int r;
- assert_return(message_type_is_addr(nlmsg_type), -EINVAL);
- assert_return(index > 0, -EINVAL);
+ assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL);
+ assert_return((nlmsg_type == RTM_GETADDR && index == 0) ||
+ index > 0, -EINVAL);
+ assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) ||
+ family == AF_INET || family == AF_INET6, -EINVAL);
assert_return(ret, -EINVAL);
- r = message_new(ret, NLMSG_SPACE(sizeof(struct ifaddrmsg)));
+ r = message_new(rtnl, ret, nlmsg_type);
if (r < 0)
return r;
- (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
- (*ret)->hdr->nlmsg_type = nlmsg_type;
+ if (nlmsg_type == RTM_GETADDR)
+ (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP;
ifa = NLMSG_DATA((*ret)->hdr);
- ifa->ifa_family = family;
- ifa->ifa_prefixlen = prefixlen;
- ifa->ifa_flags = flags;
- ifa->ifa_scope = scope;
ifa->ifa_index = index;
+ ifa->ifa_family = family;
+ if (family == AF_INET)
+ ifa->ifa_prefixlen = 32;
+ else if (family == AF_INET6)
+ ifa->ifa_prefixlen = 128;
+
+ return 0;
+}
+
+int sd_rtnl_message_new_addr_update(sd_rtnl *rtnl, sd_rtnl_message **ret,
+ int index, int family) {
+ int r;
+
+ r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family);
+ if (r < 0)
+ return r;
- UPDATE_RTA(*ret, IFA_RTA(ifa));
+ (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE;
return 0;
}
@@ -254,434 +586,682 @@ 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) {
+ if (m && REFCNT_DEC(m->n_ref) == 0) {
+ unsigned i;
+
free(m->hdr);
+
+ for (i = 0; i <= m->n_containers; i++)
+ free(m->rta_offset_tb[i]);
+
+ sd_rtnl_message_unref(m->next);
+
free(m);
}
- return NULL;
-}
+ return NULL;
+}
+
+int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type) {
+ assert_return(m, -EINVAL);
+ assert_return(type, -EINVAL);
+
+ *type = m->hdr->nlmsg_type;
+
+ return 0;
+}
+
+int sd_rtnl_message_is_broadcast(sd_rtnl_message *m) {
+ assert_return(m, -EINVAL);
+
+ return !m->hdr->nlmsg_pid;
+}
+
+int sd_rtnl_message_link_get_ifindex(sd_rtnl_message *m, int *ifindex) {
+ struct ifinfomsg *ifi;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(ifindex, -EINVAL);
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ *ifindex = ifi->ifi_index;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_get_flags(sd_rtnl_message *m, unsigned *flags) {
+ struct ifinfomsg *ifi;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(flags, -EINVAL);
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ *flags = ifi->ifi_flags;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_get_type(sd_rtnl_message *m, unsigned *type) {
+ struct ifinfomsg *ifi;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(type, -EINVAL);
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ *type = ifi->ifi_type;
+
+ return 0;
+}
+
+/* If successful the updated message will be correctly aligned, if
+ unsuccessful the old message is untouched. */
+static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data, size_t data_length) {
+ uint32_t rta_length;
+ size_t message_length, padding_length;
+ struct nlmsghdr *new_hdr;
+ struct rtattr *rta;
+ char *padding;
+ unsigned i;
+ int offset;
+
+ assert(m);
+ assert(m->hdr);
+ assert(!m->sealed);
+ assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len);
+ assert(!data || data_length);
+
+ /* get offset of the new attribute */
+ offset = m->hdr->nlmsg_len;
+
+ /* get the size of the new rta attribute (with padding at the end) */
+ rta_length = RTA_LENGTH(data_length);
+
+ /* get the new message size (with padding at the end) */
+ message_length = offset + RTA_ALIGN(rta_length);
+
+ /* realloc to fit the new attribute */
+ new_hdr = realloc(m->hdr, message_length);
+ if (!new_hdr)
+ return -ENOMEM;
+ m->hdr = new_hdr;
+
+ /* get pointer to the attribute we are about to add */
+ rta = (struct rtattr *) ((uint8_t *) m->hdr + offset);
+
+ /* if we are inside containers, extend them */
+ for (i = 0; i < m->n_containers; i++)
+ GET_CONTAINER(m, i)->rta_len += message_length - offset;
+
+ /* fill in the attribute */
+ rta->rta_type = type;
+ rta->rta_len = rta_length;
+ if (data)
+ /* we don't deal with the case where the user lies about the type
+ * and gives us too little data (so don't do that)
+ */
+ padding = mempcpy(RTA_DATA(rta), data, data_length);
+ else {
+ /* if no data was passed, make sure we still initialize the padding
+ note that we can have data_length > 0 (used by some containers) */
+ padding = RTA_DATA(rta);
+ }
+
+ /* make sure also the padding at the end of the message is initialized */
+ padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding;
+ memzero(padding, padding_length);
+
+ /* update message size */
+ m->hdr->nlmsg_len = message_length;
+
+ return offset;
+}
+
+static int message_attribute_has_type(sd_rtnl_message *m, uint16_t attribute_type, uint16_t data_type) {
+ const NLType *type;
+ int r;
+
+ r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type);
+ if (r < 0)
+ return r;
+
+ if (type->type != data_type)
+ return -EINVAL;
+
+ return type->size;
+}
+
+int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) {
+ size_t length, size;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+ assert_return(data, -EINVAL);
+
+ r = message_attribute_has_type(m, type, NLA_STRING);
+ if (r < 0)
+ return r;
+ else
+ size = (size_t)r;
+
+ if (size) {
+ length = strnlen(data, size+1);
+ if (length > size)
+ return -EINVAL;
+ } else
+ length = strlen(data);
+
+ r = add_rtattr(m, type, data, length + 1);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_u8(sd_rtnl_message *m, unsigned short type, uint8_t data) {
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+
+ r = message_attribute_has_type(m, type, NLA_U8);
+ if (r < 0)
+ return r;
+
+ r = add_rtattr(m, type, &data, sizeof(uint8_t));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+
+int sd_rtnl_message_append_u16(sd_rtnl_message *m, unsigned short type, uint16_t data) {
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+
+ r = message_attribute_has_type(m, type, NLA_U16);
+ if (r < 0)
+ return r;
+
+ r = add_rtattr(m, type, &data, sizeof(uint16_t));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t data) {
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+
+ r = message_attribute_has_type(m, type, NLA_U32);
+ if (r < 0)
+ return r;
+
+ r = add_rtattr(m, type, &data, sizeof(uint32_t));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_in_addr(sd_rtnl_message *m, unsigned short type, const struct in_addr *data) {
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+ assert_return(data, -EINVAL);
+
+ r = message_attribute_has_type(m, type, NLA_IN_ADDR);
+ if (r < 0)
+ return r;
+
+ r = add_rtattr(m, type, data, sizeof(struct in_addr));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_in6_addr(sd_rtnl_message *m, unsigned short type, const struct in6_addr *data) {
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+ assert_return(data, -EINVAL);
+
+ r = message_attribute_has_type(m, type, NLA_IN_ADDR);
+ if (r < 0)
+ return r;
+
+ r = add_rtattr(m, type, data, sizeof(struct in6_addr));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_ether_addr(sd_rtnl_message *m, unsigned short type, const struct ether_addr *data) {
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+ assert_return(data, -EINVAL);
+
+ r = message_attribute_has_type(m, type, NLA_ETHER_ADDR);
+ if (r < 0)
+ return r;
+
+ r = add_rtattr(m, type, data, ETH_ALEN);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_cache_info(sd_rtnl_message *m, unsigned short type, const struct ifa_cacheinfo *info) {
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+ assert_return(info, -EINVAL);
+
+ r = message_attribute_has_type(m, type, NLA_CACHE_INFO);
+ if (r < 0)
+ return r;
+
+ r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) {
+ size_t size;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+ assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE);
+
+ r = message_attribute_has_type(m, type, NLA_NESTED);
+ if (r < 0)
+ return r;
+ else
+ size = (size_t)r;
+
+ r = type_system_get_type_system(m->container_type_system[m->n_containers],
+ &m->container_type_system[m->n_containers + 1],
+ type);
+ if (r < 0)
+ return r;
-int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type) {
- assert_return(m, -EINVAL);
- assert_return(type, -EINVAL);
+ r = add_rtattr(m, type | NLA_F_NESTED, NULL, size);
+ if (r < 0)
+ return r;
- *type = m->hdr->nlmsg_type;
+ m->container_offsets[m->n_containers ++] = r;
return 0;
}
-int sd_rtnl_message_link_get_ifindex(sd_rtnl_message *m, int *ifindex) {
- struct ifinfomsg *ifi;
+int sd_rtnl_message_open_container_union(sd_rtnl_message *m, unsigned short type, const char *key) {
+ const NLTypeSystemUnion *type_system_union;
+ int r;
assert_return(m, -EINVAL);
- assert_return(m->hdr, -EINVAL);
- assert_return(message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
- assert_return(ifindex, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
- ifi = NLMSG_DATA(m->hdr);
+ r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type);
+ if (r < 0)
+ return r;
- *ifindex = ifi->ifi_index;
+ r = type_system_union_get_type_system(type_system_union,
+ &m->container_type_system[m->n_containers + 1],
+ key);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_append_string(m, type_system_union->match, key);
+ if (r < 0)
+ return r;
+
+ /* do we evere need non-null size */
+ r = add_rtattr(m, type, NULL, 0);
+ if (r < 0)
+ return r;
+
+ m->container_offsets[m->n_containers ++] = r;
return 0;
}
-int sd_rtnl_message_link_get_flags(sd_rtnl_message *m, unsigned *flags) {
- struct ifinfomsg *ifi;
+int sd_rtnl_message_close_container(sd_rtnl_message *m) {
assert_return(m, -EINVAL);
- assert_return(m->hdr, -EINVAL);
- assert_return(message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
- assert_return(flags, -EINVAL);
-
- ifi = NLMSG_DATA(m->hdr);
+ assert_return(!m->sealed, -EPERM);
+ assert_return(m->n_containers > 0, -EINVAL);
- *flags = ifi->ifi_flags;
+ m->container_type_system[m->n_containers] = NULL;
+ m->n_containers --;
return 0;
}
-/* If successful the updated message will be correctly aligned, if
- unsuccessful the old message is untouched. */
-static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data, size_t data_length) {
- uint32_t rta_length, message_length;
- struct nlmsghdr *new_hdr;
+int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data) {
struct rtattr *rta;
- char *padding;
- assert(m);
- assert(m->hdr);
- assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len);
- assert(!data || data_length > 0);
+ 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]);
- /* get the size of the new rta attribute (with padding at the end) */
- rta_length = RTA_LENGTH(data_length);
+ if(!m->rta_offset_tb[m->n_containers][type])
+ return -ENODATA;
- /* get the new message size (with padding at the end) */
- message_length = m->hdr->nlmsg_len + RTA_ALIGN(rta_length);
+ rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]);
- /* realloc to fit the new attribute */
- new_hdr = realloc(m->hdr, message_length);
- if (!new_hdr)
- return -ENOMEM;
- m->hdr = new_hdr;
+ *data = RTA_DATA(rta);
- /* get pointer to the attribute we are about to add */
- rta = (struct rtattr *) ((uint8_t *) m->hdr + m->hdr->nlmsg_len);
+ return RTA_PAYLOAD(rta);
+}
- /* if we are inside a container, extend it */
- if (CURRENT_CONTAINER(m))
- CURRENT_CONTAINER(m)->rta_len += message_length - m->hdr->nlmsg_len;
+int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const char **data) {
+ int r;
+ void *attr_data;
- /* fill in the attribute */
- rta->rta_type = type;
- rta->rta_len = rta_length;
- if (!data) {
- /* this is the start of a new container */
- m->container_offset = m->hdr->nlmsg_len;
- } else {
- /* we don't deal with the case where the user lies about the type
- * and gives us too little data (so don't do that)
- */
- padding = mempcpy(RTA_DATA(rta), data, data_length);
- /* make sure also the padding at the end of the message is initialized */
- memzero(padding,
- (uint8_t *) m->hdr + message_length - (uint8_t *) padding);
- }
+ assert_return(m, -EINVAL);
- /* update message size */
- m->hdr->nlmsg_len = message_length;
+ r = message_attribute_has_type(m, type, NLA_STRING);
+ if (r < 0)
+ return r;
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if (strnlen(attr_data, r) >= (size_t) r)
+ return -EIO;
+
+ if (data)
+ *data = (const char *) attr_data;
return 0;
}
-int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) {
- uint16_t rtm_type;
+int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data) {
int r;
+ void *attr_data;
assert_return(m, -EINVAL);
- assert_return(data, -EINVAL);
- r = sd_rtnl_message_get_type(m, &rtm_type);
- if (r < 0)
- return r;
-
- /* check that the type is correct */
- switch (rtm_type) {
- case RTM_NEWLINK:
- case RTM_SETLINK:
- case RTM_GETLINK:
- case RTM_DELLINK:
- if (CURRENT_CONTAINER(m)) {
- if (CURRENT_CONTAINER(m)->rta_type != IFLA_LINKINFO ||
- type != IFLA_INFO_KIND)
- return -ENOTSUP;
- } else {
- switch (type) {
- case IFLA_IFNAME:
- case IFLA_IFALIAS:
- case IFLA_QDISC:
- break;
- default:
- return -ENOTSUP;
- }
- }
- break;
- case RTM_NEWADDR:
- case RTM_GETADDR:
- case RTM_DELADDR:
- if (type != IFA_LABEL)
- return -ENOTSUP;
- break;
- default:
- return -ENOTSUP;
- }
+ r = message_attribute_has_type(m, type, NLA_U8);
+ if (r < 0)
+ return r;
- r = add_rtattr(m, type, data, strlen(data) + 1);
+ r = rtnl_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
+ else if ((size_t) r < sizeof(uint8_t))
+ return -EIO;
+
+ if (data)
+ *data = *(uint8_t *) attr_data;
return 0;
}
-int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t data) {
- uint16_t rtm_type;
+int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data) {
int r;
+ void *attr_data;
assert_return(m, -EINVAL);
- r = sd_rtnl_message_get_type(m, &rtm_type);
+ r = message_attribute_has_type(m, type, NLA_U16);
if (r < 0)
return r;
- /* check that the type is correct */
- switch (rtm_type) {
- case RTM_NEWLINK:
- case RTM_SETLINK:
- case RTM_GETLINK:
- case RTM_DELLINK:
- switch (type) {
- case IFLA_MASTER:
- case IFLA_MTU:
- case IFLA_LINK:
- break;
- default:
- return -ENOTSUP;
- }
- break;
- case RTM_NEWROUTE:
- case RTM_GETROUTE:
- case RTM_DELROUTE:
- switch (type) {
- case RTA_TABLE:
- case RTA_PRIORITY:
- case RTA_IIF:
- case RTA_OIF:
- break;
- default:
- return -ENOTSUP;
- }
- break;
- default:
- return -ENOTSUP;
- }
-
- r = add_rtattr(m, type, &data, sizeof(uint32_t));
+ r = rtnl_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
+ else if ((size_t) r < sizeof(uint16_t))
+ return -EIO;
+
+ if (data)
+ *data = *(uint16_t *) attr_data;
return 0;
}
-int sd_rtnl_message_append_in_addr(sd_rtnl_message *m, unsigned short type, const struct in_addr *data) {
- struct ifaddrmsg *ifa;
- struct rtmsg *rtm;
- uint16_t rtm_type;
+int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data) {
int r;
+ void *attr_data;
assert_return(m, -EINVAL);
- assert_return(data, -EINVAL);
- r = sd_rtnl_message_get_type(m, &rtm_type);
+ r = message_attribute_has_type(m, type, NLA_U32);
if (r < 0)
return r;
- /* check that the type is correct */
- switch (rtm_type) {
- case RTM_NEWADDR:
- case RTM_GETADDR:
- case RTM_DELADDR:
- switch (type) {
- case IFA_ADDRESS:
- case IFA_LOCAL:
- case IFA_BROADCAST:
- case IFA_ANYCAST:
- ifa = NLMSG_DATA(m->hdr);
-
- if (ifa->ifa_family != AF_INET)
- return -EINVAL;
-
- break;
- default:
- return -ENOTSUP;
- }
- break;
- case RTM_NEWROUTE:
- case RTM_GETROUTE:
- case RTM_DELROUTE:
- switch (type) {
- case RTA_DST:
- case RTA_SRC:
- case RTA_GATEWAY:
- rtm = NLMSG_DATA(m->hdr);
-
- if (rtm->rtm_family != AF_INET)
- return -EINVAL;
-
- break;
- default:
- return -ENOTSUP;
- }
- break;
- default:
- return -ENOTSUP;
- }
-
- r = add_rtattr(m, type, data, sizeof(struct in_addr));
+ r = rtnl_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
+ else if ((size_t)r < sizeof(uint32_t))
+ return -EIO;
+
+ if (data)
+ *data = *(uint32_t *) attr_data;
return 0;
}
-int sd_rtnl_message_append_in6_addr(sd_rtnl_message *m, unsigned short type, const struct in6_addr *data) {
- struct ifaddrmsg *ifa;
- struct rtmsg *rtm;
- uint16_t rtm_type;
+int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, struct ether_addr *data) {
int r;
+ void *attr_data;
assert_return(m, -EINVAL);
- assert_return(data, -EINVAL);
- r = sd_rtnl_message_get_type(m, &rtm_type);
+ r = message_attribute_has_type(m, type, NLA_ETHER_ADDR);
if (r < 0)
return r;
- /* check that the type is correct */
- switch (rtm_type) {
- case RTM_NEWADDR:
- case RTM_GETADDR:
- case RTM_DELADDR:
- switch (type) {
- case IFA_ADDRESS:
- case IFA_LOCAL:
- case IFA_BROADCAST:
- case IFA_ANYCAST:
- ifa = NLMSG_DATA(m->hdr);
-
- if (ifa->ifa_family != AF_INET6)
- return -EINVAL;
-
- break;
- default:
- return -ENOTSUP;
- }
- break;
- case RTM_NEWROUTE:
- case RTM_GETROUTE:
- case RTM_DELROUTE:
- switch (type) {
- case RTA_DST:
- case RTA_SRC:
- case RTA_GATEWAY:
- rtm = NLMSG_DATA(m->hdr);
-
- if (rtm->rtm_family != AF_INET6)
- return -EINVAL;
-
- break;
- default:
- return -ENOTSUP;
- }
- default:
- return -ENOTSUP;
- }
-
- r = add_rtattr(m, type, data, sizeof(struct in6_addr));
+ r = rtnl_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
+ else if ((size_t)r < sizeof(struct ether_addr))
+ return -EIO;
+
+ if (data)
+ memcpy(data, attr_data, sizeof(struct ether_addr));
return 0;
}
-int sd_rtnl_message_append_ether_addr(sd_rtnl_message *m, unsigned short type, const struct ether_addr *data) {
- uint16_t rtm_type;
+int sd_rtnl_message_read_cache_info(sd_rtnl_message *m, unsigned short type, struct ifa_cacheinfo *info) {
int r;
+ void *attr_data;
assert_return(m, -EINVAL);
- assert_return(data, -EINVAL);
- sd_rtnl_message_get_type(m, &rtm_type);
-
- switch (rtm_type) {
- case RTM_NEWLINK:
- case RTM_SETLINK:
- case RTM_DELLINK:
- case RTM_GETLINK:
- switch (type) {
- case IFLA_ADDRESS:
- case IFLA_BROADCAST:
- break;
- default:
- return -ENOTSUP;
- }
- break;
- default:
- return -ENOTSUP;
- }
+ r = message_attribute_has_type(m, type, NLA_CACHE_INFO);
+ if (r < 0)
+ return r;
- r = add_rtattr(m, type, data, ETH_ALEN);
+ r = rtnl_message_read_internal(m, type, &attr_data);
if (r < 0)
return r;
+ else if ((size_t)r < sizeof(struct ifa_cacheinfo))
+ return -EIO;
+
+ if (info)
+ memcpy(info, attr_data, sizeof(struct ifa_cacheinfo));
return 0;
}
-int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) {
- uint16_t rtm_type;
+int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct in_addr *data) {
+ int r;
+ void *attr_data;
assert_return(m, -EINVAL);
- assert_return(!CURRENT_CONTAINER(m), -EINVAL);
- sd_rtnl_message_get_type(m, &rtm_type);
+ r = message_attribute_has_type(m, type, NLA_IN_ADDR);
+ if (r < 0)
+ return r;
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if ((size_t)r < sizeof(struct in_addr))
+ return -EIO;
- if (message_type_is_link(rtm_type)) {
- if (type == IFLA_LINKINFO)
- return add_rtattr(m, type, NULL, 0);
- else
- return -ENOTSUP;
- } else
- return -ENOTSUP;
+ if (data)
+ memcpy(data, attr_data, sizeof(struct in_addr));
return 0;
}
-int sd_rtnl_message_close_container(sd_rtnl_message *m) {
+int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struct in6_addr *data) {
+ int r;
+ void *attr_data;
+
assert_return(m, -EINVAL);
- assert_return(CURRENT_CONTAINER(m), -EINVAL);
- m->container_offset = 0;
+ r = message_attribute_has_type(m, type, NLA_IN_ADDR);
+ if (r < 0)
+ return r;
+
+ r = rtnl_message_read_internal(m, type, &attr_data);
+ if (r < 0)
+ return r;
+ else if ((size_t)r < sizeof(struct in6_addr))
+ return -EIO;
+
+ if (data)
+ memcpy(data, attr_data, sizeof(struct in6_addr));
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 sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type) {
+ const NLType *nl_type;
+ const NLTypeSystem *type_system;
+ void *container;
+ size_t size;
int r;
- assert(m);
- assert(m->next_rta_offset);
- assert(type);
- assert(data);
+ assert_return(m, -EINVAL);
+ assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL);
- remaining_size = m->hdr->nlmsg_len - m->next_rta_offset;
+ r = type_system_get_type(m->container_type_system[m->n_containers],
+ &nl_type,
+ type);
+ if (r < 0)
+ return r;
- if (!RTA_OK(NEXT_RTA(m), remaining_size))
- return 0;
+ if (nl_type->type == NLA_NESTED) {
+ r = type_system_get_type_system(m->container_type_system[m->n_containers],
+ &type_system,
+ type);
+ if (r < 0)
+ return r;
+ } else if (nl_type->type == NLA_UNION) {
+ const NLTypeSystemUnion *type_system_union;
+ const char *key;
+
+ r = type_system_get_type_system_union(m->container_type_system[m->n_containers],
+ &type_system_union,
+ type);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_read_string(m, type_system_union->match, &key);
+ if (r < 0)
+ return r;
+
+ r = type_system_union_get_type_system(type_system_union,
+ &type_system,
+ key);
+ if (r < 0)
+ return r;
+ } else
+ return -EINVAL;
- /* make sure we don't try to read a container
- * TODO: add support for entering containers for reading */
- r = sd_rtnl_message_get_type(m, &rtm_type);
+ r = rtnl_message_read_internal(m, type, &container);
if (r < 0)
return r;
+ else
+ size = (size_t)r;
+
+ m->n_containers ++;
+
+ r = rtnl_message_parse(m,
+ &m->rta_offset_tb[m->n_containers],
+ &m->rta_tb_size[m->n_containers],
+ type_system->max,
+ container,
+ size);
+ if (r < 0) {
+ m->n_containers --;
+ return r;
+ }
+
+ m->container_type_system[m->n_containers] = type_system;
+
+ return 0;
+}
- if (message_type_is_link(rtm_type) &&
- NEXT_RTA(m)->rta_type == IFLA_LINKINFO)
- return -EINVAL;
+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);
- *data = RTA_DATA(NEXT_RTA(m));
- *type = NEXT_RTA(m)->rta_type;
+ free(m->rta_offset_tb[m->n_containers]);
+ m->rta_offset_tb[m->n_containers] = NULL;
+ m->container_type_system[m->n_containers] = NULL;
- UPDATE_RTA(m, RTA_NEXT(NEXT_RTA(m), remaining_size));
+ m->n_containers --;
- return 1;
+ return 0;
}
-uint32_t message_get_serial(sd_rtnl_message *m) {
+uint32_t rtnl_message_get_serial(sd_rtnl_message *m) {
assert(m);
assert(m->hdr);
return m->hdr->nlmsg_seq;
}
+int sd_rtnl_message_is_error(sd_rtnl_message *m) {
+ assert_return(m, 0);
+ assert_return(m->hdr, 0);
+
+ return m->hdr->nlmsg_type == NLMSG_ERROR;
+}
+
int sd_rtnl_message_get_errno(sd_rtnl_message *m) {
struct nlmsgerr *err;
assert_return(m, -EINVAL);
assert_return(m->hdr, -EINVAL);
- if (m->hdr->nlmsg_type != NLMSG_ERROR)
+ if (!sd_rtnl_message_is_error(m))
return 0;
err = NLMSG_DATA(m->hdr);
@@ -689,36 +1269,37 @@ int sd_rtnl_message_get_errno(sd_rtnl_message *m) {
return err->error;
}
-int message_seal(sd_rtnl *nl, sd_rtnl_message *m) {
- assert(nl);
- assert(m);
- assert(m->hdr);
+int rtnl_message_parse(sd_rtnl_message *m,
+ size_t **rta_offset_tb,
+ unsigned short *rta_tb_size,
+ int max,
+ struct rtattr *rta,
+ unsigned int rt_len) {
+ unsigned short type;
+ size_t *tb;
+
+ tb = new0(size_t, max + 1);
+ if(!tb)
+ return -ENOMEM;
- if (m->sealed)
- return -EPERM;
+ *rta_tb_size = max + 1;
- m->hdr->nlmsg_seq = nl->serial++;
- m->sealed = true;
+ for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) {
+ type = RTA_TYPE(rta);
- return 0;
-}
+ /* if the kernel is newer than the headers we used
+ when building, we ignore out-of-range attributes
+ */
+ if (type > max)
+ continue;
-static int message_receive_need(sd_rtnl *rtnl, size_t *need) {
- assert(rtnl);
- assert(need);
+ if (tb[type])
+ log_debug("rtnl: message parse - overwriting repeated attribute");
- /* ioctl(rtnl->fd, FIONREAD, &need)
- Does not appear to work on netlink sockets. libnl uses
- MSG_PEEK instead. I don't know if that is worth the
- extra roundtrip.
+ tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr;
+ }
- For now we simply use the maximum message size the kernel
- may use (NLMSG_GOODSIZE), and then realloc to the actual
- size after reading the message (hence avoiding huge memory
- usage in case many small messages are kept around) */
- *need = page_size();
- if (*need > 8192UL)
- *need = 8192UL;
+ *rta_offset_tb = tb;
return 0;
}
@@ -745,146 +1326,290 @@ int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) {
return k;
}
+static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) {
+ uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred)) +
+ CMSG_SPACE(sizeof(struct nl_pktinfo))];
+ struct msghdr msg = {
+ .msg_iov = iov,
+ .msg_iovlen = 1,
+ .msg_control = cred_buffer,
+ .msg_controllen = sizeof(cred_buffer),
+ };
+ struct cmsghdr *cmsg;
+ uint32_t group = 0;
+ bool auth = false;
+ int r;
+
+ assert(fd >= 0);
+ assert(iov);
+
+ r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0));
+ if (r < 0) {
+ /* no data */
+ if (errno == ENOBUFS)
+ log_debug("rtnl: kernel receive buffer overrun");
+ else if (errno == EAGAIN)
+ log_debug("rtnl: no data in socket");
+
+ return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
+ } else if (r == 0)
+ /* connection was closed by the kernel */
+ return -ECONNRESET;
+
+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ if (cmsg->cmsg_level == SOL_SOCKET &&
+ cmsg->cmsg_type == SCM_CREDENTIALS &&
+ cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
+ struct ucred *ucred = (void *)CMSG_DATA(cmsg);
+
+ /* from the kernel */
+ if (ucred->pid == 0)
+ auth = true;
+ else
+ log_debug("rtnl: ignoring message from pid %u", ucred->pid);
+ } else if (cmsg->cmsg_level == SOL_NETLINK &&
+ cmsg->cmsg_type == NETLINK_PKTINFO &&
+ cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) {
+ struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg);
+
+ /* multi-cast group */
+ group = pktinfo->group;
+ }
+ }
+
+ if (!auth) {
+ /* not from the kernel, ignore */
+ if (peek) {
+ /* drop the message */
+ r = recvmsg(fd, &msg, 0);
+ if (r < 0)
+ return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
+ }
+
+ return 0;
+ }
+
+ if (group)
+ *_group = group;
+
+ return r;
+}
+
/* On success, the number of bytes received is returned and *ret points to the received message
* which has a valid header and the correct size.
* If nothing useful was received 0 is returned.
* On failure, a negative error code is returned.
*/
-int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret) {
- sd_rtnl_message *m;
- union {
- struct sockaddr sa;
- struct sockaddr_nl nl;
- } addr;
- socklen_t addr_len;
+int socket_read_message(sd_rtnl *rtnl) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *first = NULL;
+ struct iovec iov = {};
+ uint32_t group = 0;
+ bool multi_part = false, done = false;
+ struct nlmsghdr *new_msg;
+ size_t len;
int r;
- ssize_t k;
- size_t need;
+ unsigned i = 0;
- assert(nl);
- assert(ret);
+ assert(rtnl);
+ assert(rtnl->rbuffer);
+ assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr));
- r = message_receive_need(nl, &need);
- if (r < 0)
+ /* read nothing, just get the pending message size */
+ r = socket_recv_message(rtnl->fd, &iov, &group, true);
+ if (r <= 0)
return r;
+ else
+ len = (size_t)r;
- r = message_new(&m, need);
- if (r < 0)
+ /* make room for the pending message */
+ if (!greedy_realloc((void **)&rtnl->rbuffer,
+ &rtnl->rbuffer_allocated,
+ len, sizeof(uint8_t)))
+ return -ENOMEM;
+
+ iov.iov_base = rtnl->rbuffer;
+ iov.iov_len = rtnl->rbuffer_allocated;
+
+ /* read the pending message */
+ r = socket_recv_message(rtnl->fd, &iov, &group, false);
+ if (r <= 0)
return r;
+ else
+ len = (size_t)r;
- addr_len = sizeof(addr);
+ if (len > rtnl->rbuffer_allocated)
+ /* message did not fit in read buffer */
+ return -EIO;
- k = 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 */
- else if (addr_len != sizeof(addr.nl) ||
- addr.nl.nl_family != AF_NETLINK)
- k = -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) */
- 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) {
- struct ifinfomsg *ifi;
- struct ifaddrmsg *ifa;
- struct rtmsg *rtm;
-
- /* 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 {
- ifi = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, IFLA_RTA(ifi));
- }
- break;
- case RTM_NEWADDR:
- case RTM_DELADDR:
- case RTM_GETADDR:
- if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifaddrmsg)))
- k = -EIO;
- else {
- ifa = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, IFA_RTA(ifa));
- }
- break;
- case RTM_NEWROUTE:
- case RTM_DELROUTE:
- case RTM_GETROUTE:
- if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtmsg)))
- k = -EIO;
- else {
- rtm = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, RTM_RTA(rtm));
- }
- break;
- case NLMSG_NOOP:
- k = 0;
+ if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) {
+ multi_part = true;
+
+ for (i = 0; i < rtnl->rqueue_partial_size; i++) {
+ if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) ==
+ rtnl->rbuffer->nlmsg_seq) {
+ first = rtnl->rqueue_partial[i];
break;
- default:
- k = 0; /* ignoring message of unknown type */
+ }
+ }
+ }
+
+ for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len) && !done; new_msg = NLMSG_NEXT(new_msg, len)) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ const NLType *nl_type;
+
+ if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid)
+ /* not broadcast and not for us */
+ continue;
+
+ if (new_msg->nlmsg_type == NLMSG_NOOP)
+ /* silently drop noop messages */
+ continue;
+
+ if (new_msg->nlmsg_type == NLMSG_DONE) {
+ /* finished reading multi-part message */
+ done = true;
+
+ continue;
}
- 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;
+ /* check that we support this message type */
+ r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type);
+ if (r < 0) {
+ if (r == -ENOTSUP)
+ log_debug("sd-rtnl: ignored message with unknown type: %i",
+ new_msg->nlmsg_type);
+
+ continue;
+ }
+
+ /* check that the size matches the message type */
+ if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) {
+ log_debug("sd-rtnl: message larger than expected, dropping");
+ continue;
+ }
+
+ r = message_new_empty(rtnl, &m);
+ if (r < 0)
+ return r;
+
+ m->hdr = memdup(new_msg, new_msg->nlmsg_len);
+ if (!m->hdr)
+ return -ENOMEM;
+
+ /* seal and parse the top-level message */
+ r = sd_rtnl_message_rewind(m);
+ if (r < 0)
+ return r;
+
+ /* push the message onto the multi-part message stack */
+ if (first)
+ m->next = first;
+ first = m;
+ m = NULL;
}
- return k;
+ if (len)
+ log_debug("sd-rtnl: discarding %zu bytes of incoming message", len);
+
+ if (!first)
+ return 0;
+
+ if (!multi_part || done) {
+ /* we got a complete message, push it on the read queue */
+ r = rtnl_rqueue_make_room(rtnl);
+ if (r < 0)
+ return r;
+
+ rtnl->rqueue[rtnl->rqueue_size ++] = first;
+ first = NULL;
+
+ if (multi_part && (i < rtnl->rqueue_partial_size)) {
+ /* remove the message form the partial read queue */
+ memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1,
+ sizeof(sd_rtnl_message*) * (rtnl->rqueue_partial_size - i - 1));
+ rtnl->rqueue_partial_size --;
+ }
+
+ return 1;
+ } else {
+ /* we only got a partial multi-part message, push it on the
+ partial read queue */
+ if (i < rtnl->rqueue_partial_size) {
+ rtnl->rqueue_partial[i] = first;
+ } else {
+ r = rtnl_rqueue_partial_make_room(rtnl);
+ if (r < 0)
+ return r;
+
+ rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first;
+ }
+ first = NULL;
+
+ return 0;
+ }
}
int sd_rtnl_message_rewind(sd_rtnl_message *m) {
- struct ifinfomsg *ifi;
- struct ifaddrmsg *ifa;
- struct rtmsg *rtm;
+ const NLType *type;
+ unsigned i;
+ int r;
assert_return(m, -EINVAL);
- assert_return(m->hdr, -EINVAL);
- switch(m->hdr->nlmsg_type) {
- case RTM_NEWLINK:
- case RTM_SETLINK:
- case RTM_GETLINK:
- case RTM_DELLINK:
- ifi = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, IFLA_RTA(ifi));
-
- break;
- case RTM_NEWADDR:
- case RTM_GETADDR:
- case RTM_DELADDR:
- ifa = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, IFA_RTA(ifa));
-
- break;
- case RTM_NEWROUTE:
- case RTM_GETROUTE:
- case RTM_DELROUTE:
- rtm = NLMSG_DATA(m->hdr);
- UPDATE_RTA(m, RTM_RTA(rtm));
-
- break;
- default:
- return -ENOTSUP;
+ /* 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->container_type_system[i] = NULL;
+ }
+
+ m->n_containers = 0;
+
+ if (m->rta_offset_tb[0]) {
+ /* top-level attributes have already been parsed */
+ return 0;
+ }
+
+ assert(m->hdr);
+
+ r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type);
+ if (r < 0)
+ return r;
+
+ if (type->type == NLA_NESTED) {
+ const NLTypeSystem *type_system = type->type_system;
+
+ assert(type_system);
+
+ m->container_type_system[0] = type_system;
+
+ r = rtnl_message_parse(m,
+ &m->rta_offset_tb[m->n_containers],
+ &m->rta_tb_size[m->n_containers],
+ type_system->max,
+ (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) +
+ NLMSG_ALIGN(type->size)),
+ NLMSG_PAYLOAD(m->hdr, type->size));
+ if (r < 0)
+ return r;
}
return 0;
}
+
+void rtnl_message_seal(sd_rtnl_message *m) {
+ assert(m);
+ assert(!m->sealed);
+
+ m->sealed = true;
+}
+
+sd_rtnl_message *sd_rtnl_message_next(sd_rtnl_message *m) {
+ assert_return(m, NULL);
+
+ return m->next;
+}