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Handle suspend, shutdown, reboot, etc within elogind
[elogind.git] / src / libsystemd / sd-netlink / netlink-message.c
diff --git a/src/libsystemd/sd-netlink/netlink-message.c b/src/libsystemd/sd-netlink/netlink-message.c
index b0ed2f28825bf9dfd7408b6f9e423edfa5af9a79..a913d82cf03af5cfb6bd9d7115f56422e02096bb 100644 (file)
--- a/src/libsystemd/sd-netlink/netlink-message.c
+++ b/src/libsystemd/sd-netlink/netlink-message.c
@@ -34,11 +34,10 @@
 #include "netlink-internal.h"
 #include "netlink-types.h"
 
-#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->containers[i].offset) : NULL)
+#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;
 
 #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK)
-#define RTA_FLAGS(rta) ((rta)->rta_type & ~NLA_TYPE_MASK)
 
 int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) {
         sd_netlink_message *m;
@@ -89,7 +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->containers[0].type_system);
+        type_get_type_system(nl_type, &m->container_type_system[0]);
         m->hdr->nlmsg_len = size;
         m->hdr->nlmsg_type = type;
 
@@ -130,7 +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->containers[i].attributes);
+                        free(m->rta_offset_tb[i]);
 
                 sd_netlink_message_unref(m->next);
 
@@ -224,7 +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->containers[m->n_containers].type_system, &type, attribute_type);
+        r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type);
         if (r < 0)
                 return r;
 
@@ -262,6 +261,24 @@ int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type,
         return 0;
 }
 
+int sd_netlink_message_append_flag(sd_netlink_message *m, unsigned short type) {
+        size_t size;
+        int r;
+
+        assert_return(m, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+
+        r = message_attribute_has_type(m, &size, type, NETLINK_TYPE_FLAG);
+        if (r < 0)
+                return r;
+
+        r = add_rtattr(m, type, NULL, 0);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
 int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) {
         int r;
 
@@ -407,18 +424,18 @@ 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->containers[m->n_containers].type_system, &type_system_union, type);
+                r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type);
                 if (r < 0)
                         return r;
 
                 r = type_system_union_protocol_get_type_system(type_system_union,
-                                                               &m->containers[m->n_containers + 1].type_system,
+                                                               &m->container_type_system[m->n_containers + 1],
                                                                family);
                 if (r < 0)
                         return r;
         } else {
-                r = type_system_get_type_system(m->containers[m->n_containers].type_system,
-                                                &m->containers[m->n_containers + 1].type_system,
+                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;
@@ -428,7 +445,7 @@ int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type
         if (r < 0)
                 return r;
 
-        m->containers[m->n_containers ++].offset = r;
+        m->container_offsets[m->n_containers ++] = r;
 
         return 0;
 }
@@ -440,12 +457,12 @@ 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->containers[m->n_containers].type_system, &type_system_union, type);
+        r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type);
         if (r < 0)
                 return r;
 
         r = type_system_union_get_type_system(type_system_union,
-                                              &m->containers[m->n_containers + 1].type_system,
+                                              &m->container_type_system[m->n_containers + 1],
                                               key);
         if (r < 0)
                 return r;
@@ -459,7 +476,7 @@ int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned shor
         if (r < 0)
                 return r;
 
-        m->containers[m->n_containers ++].offset = r;
+        m->container_offsets[m->n_containers ++] = r;
 
         return 0;
 }
@@ -470,35 +487,29 @@ int sd_netlink_message_close_container(sd_netlink_message *m) {
         assert_return(!m->sealed, -EPERM);
         assert_return(m->n_containers > 0, -EINVAL);
 
-        m->containers[m->n_containers].type_system = NULL;
+        m->container_type_system[m->n_containers] = NULL;
         m->n_containers --;
 
         return 0;
 }
 
-static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data, bool *net_byteorder) {
-        struct netlink_attribute *attribute;
+static int netlink_message_read_internal(sd_netlink_message *m, unsigned short type, void **data) {
         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->containers[m->n_containers].attributes);
-        assert(type < m->containers[m->n_containers].n_attributes);
-
-        attribute = &m->containers[m->n_containers].attributes[type];
+        assert(m->rta_offset_tb[m->n_containers]);
+        assert(type < m->rta_tb_size[m->n_containers]);
 
-        if(!attribute->offset)
+        if(!m->rta_offset_tb[m->n_containers][type])
                 return -ENODATA;
 
-        rta = (struct rtattr*)((uint8_t *) m->hdr + attribute->offset);
+        rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]);
 
         *data = RTA_DATA(rta);
 
-        if (net_byteorder)
-                *net_byteorder = attribute->net_byteorder;
-
         return RTA_PAYLOAD(rta);
 }
 
@@ -512,7 +523,7 @@ int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, c
         if (r < 0)
                 return r;
 
-        r = netlink_message_read_internal(m, type, &attr_data, NULL);
+        r = netlink_message_read_internal(m, type, &attr_data);
         if (r < 0)
                 return r;
         else if (strnlen(attr_data, r) >= (size_t) r)
@@ -534,7 +545,7 @@ int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8
         if (r < 0)
                 return r;
 
-        r = netlink_message_read_internal(m, type, &attr_data, NULL);
+        r = netlink_message_read_internal(m, type, &attr_data);
         if (r < 0)
                 return r;
         else if ((size_t) r < sizeof(uint8_t))
@@ -547,9 +558,8 @@ int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8
 }
 
 int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) {
-        void *attr_data;
-        bool net_byteorder;
         int r;
+        void *attr_data;
 
         assert_return(m, -EINVAL);
 
@@ -557,26 +567,21 @@ int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint
         if (r < 0)
                 return r;
 
-        r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder);
+        r = netlink_message_read_internal(m, type, &attr_data);
         if (r < 0)
                 return r;
         else if ((size_t) r < sizeof(uint16_t))
                 return -EIO;
 
-        if (data) {
-                if (net_byteorder)
-                        *data = be16toh(*(uint16_t *) attr_data);
-                else
-                        *data = *(uint16_t *) attr_data;
-        }
+        if (data)
+                *data = *(uint16_t *) attr_data;
 
         return 0;
 }
 
 int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) {
-        void *attr_data;
-        bool net_byteorder;
         int r;
+        void *attr_data;
 
         assert_return(m, -EINVAL);
 
@@ -584,18 +589,14 @@ int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint
         if (r < 0)
                 return r;
 
-        r = netlink_message_read_internal(m, type, &attr_data, &net_byteorder);
+        r = netlink_message_read_internal(m, type, &attr_data);
         if (r < 0)
                 return r;
         else if ((size_t)r < sizeof(uint32_t))
                 return -EIO;
 
-        if (data) {
-                if (net_byteorder)
-                        *data = be32toh(*(uint32_t *) attr_data);
-                else
-                        *data = *(uint32_t *) attr_data;
-        }
+        if (data)
+                *data = *(uint32_t *) attr_data;
 
         return 0;
 }
@@ -610,7 +611,7 @@ int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short typ
         if (r < 0)
                 return r;
 
-        r = netlink_message_read_internal(m, type, &attr_data, NULL);
+        r = netlink_message_read_internal(m, type, &attr_data);
         if (r < 0)
                 return r;
         else if ((size_t)r < sizeof(struct ether_addr))
@@ -632,7 +633,7 @@ int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short typ
         if (r < 0)
                 return r;
 
-        r = netlink_message_read_internal(m, type, &attr_data, NULL);
+        r = netlink_message_read_internal(m, type, &attr_data);
         if (r < 0)
                 return r;
         else if ((size_t)r < sizeof(struct ifa_cacheinfo))
@@ -654,7 +655,7 @@ int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type,
         if (r < 0)
                 return r;
 
-        r = netlink_message_read_internal(m, type, &attr_data, NULL);
+        r = netlink_message_read_internal(m, type, &attr_data);
         if (r < 0)
                 return r;
         else if ((size_t)r < sizeof(struct in_addr))
@@ -676,7 +677,7 @@ int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type,
         if (r < 0)
                 return r;
 
-        r = netlink_message_read_internal(m, type, &attr_data, NULL);
+        r = netlink_message_read_internal(m, type, &attr_data);
         if (r < 0)
                 return r;
         else if ((size_t)r < sizeof(struct in6_addr))
@@ -688,38 +689,37 @@ 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;
+static int netlink_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;
 
-        attributes = new0(struct netlink_attribute, count);
-        if(!attributes)
+        tb = new0(size_t, count);
+        if(!tb)
                 return -ENOMEM;
 
-        for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) {
-                unsigned short type;
+        *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 */
+                   when building, we ignore out-of-range attributes
+                 */
                 if (type >= count)
                         continue;
 
-                if (attributes[type].offset)
+                if (tb[type])
                         log_debug("rtnl: message parse - overwriting repeated attribute");
 
-                attributes[type].offset = (uint8_t *) rta - (uint8_t *) m->hdr;
-                attributes[type].nested = RTA_FLAGS(rta) & NLA_F_NESTED;
-                attributes[type].net_byteorder = RTA_FLAGS(rta) & NLA_F_NET_BYTEORDER;
+                tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr;
         }
 
-        container->attributes = attributes;
-        attributes = NULL;
-        container->n_attributes = count;
+        *rta_offset_tb = tb;
 
         return 0;
 }
@@ -735,7 +735,7 @@ 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->containers[m->n_containers].type_system,
+        r = type_system_get_type(m->container_type_system[m->n_containers],
                                  &nl_type,
                                  type_id);
         if (r < 0)
@@ -744,7 +744,7 @@ 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->containers[m->n_containers].type_system,
+                r = type_system_get_type_system(m->container_type_system[m->n_containers],
                                                 &type_system,
                                                 type_id);
                 if (r < 0)
@@ -752,7 +752,7 @@ 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->containers[m->n_containers].type_system,
+                r = type_system_get_type_system_union(m->container_type_system[m->n_containers],
                                                       &type_system_union,
                                                       type_id);
                 if (r < 0)
@@ -797,7 +797,7 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ
         } else
                 return -EINVAL;
 
-        r = netlink_message_read_internal(m, type_id, &container, NULL);
+        r = netlink_message_read_internal(m, type_id, &container);
         if (r < 0)
                 return r;
         else
@@ -805,17 +805,18 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ
 
         m->n_containers ++;
 
-        r = netlink_container_parse(m,
-                                    &m->containers[m->n_containers],
-                                    type_system_get_count(type_system),
-                                    container,
-                                    size);
+        r = netlink_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);
         if (r < 0) {
                 m->n_containers --;
                 return r;
         }
 
-        m->containers[m->n_containers].type_system = type_system;
+        m->container_type_system[m->n_containers] = type_system;
 
         return 0;
 }
@@ -825,9 +826,9 @@ int sd_netlink_message_exit_container(sd_netlink_message *m) {
         assert_return(m->sealed, -EINVAL);
         assert_return(m->n_containers > 0, -EINVAL);
 
-        free(m->containers[m->n_containers].attributes);
-        m->containers[m->n_containers].attributes = NULL;
-        m->containers[m->n_containers].type_system = NULL;
+        free(m->rta_offset_tb[m->n_containers]);
+        m->rta_offset_tb[m->n_containers] = NULL;
+        m->container_type_system[m->n_containers] = NULL;
 
         m->n_containers --;
 
@@ -876,13 +877,15 @@ int sd_netlink_message_rewind(sd_netlink_message *m) {
                 rtnl_message_seal(m);
 
         for (i = 1; i <= m->n_containers; i++) {
-                free(m->containers[i].attributes);
-                m->containers[i].attributes = NULL;
+                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->containers[0].attributes) {
+        if (m->rta_offset_tb[0]) {
                 /* top-level attributes have already been parsed */
                 return 0;
         }
@@ -901,13 +904,14 @@ int sd_netlink_message_rewind(sd_netlink_message *m) {
 
                 type_get_type_system(nl_type, &type_system);
 
-                m->containers[0].type_system = type_system;
+                m->container_type_system[0] = type_system;
 
-                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));
+                r = netlink_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));
                 if (r < 0)
                         return r;
         }
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