Support dumping the netlink policy of a given generic netlink family, the policy (with any sub-policies if appropriate) is exported by the kernel in a general fashion.
Signed-off-by: Johannes Berg <[email protected]> --- genl/ctrl.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 85 insertions(+), 6 deletions(-) diff --git a/genl/ctrl.c b/genl/ctrl.c index 0fb464b01cfb..7767fffe63ea 100644 --- a/genl/ctrl.c +++ b/genl/ctrl.c @@ -28,13 +28,15 @@ static int usage(void) { fprintf(stderr,"Usage: ctrl <CMD>\n" \ - "CMD := get <PARMS> | list | monitor\n" \ + "CMD := get <PARMS> | list | monitor | policy <PARMS>\n" \ "PARMS := name <name> | id <id>\n" \ "Examples:\n" \ "\tctrl ls\n" \ "\tctrl monitor\n" \ "\tctrl get name foobar\n" \ - "\tctrl get id 0xF\n"); + "\tctrl get id 0xF\n" + "\tctrl policy name foobar\n" + "\tctrl policy id 0xF\n"); return -1; } @@ -100,6 +102,30 @@ static int print_ctrl_grp(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) } +static const char *get_nla_type_str(unsigned int attr) +{ + switch (attr) { +#define C(x) case NL_ATTR_TYPE_ ## x: return #x + C(U8); + C(U16); + C(U32); + C(U64); + C(STRING); + C(FLAG); + C(NESTED); + C(NESTED_ARRAY); + C(NUL_STRING); + C(BINARY); + C(S8); + C(S16); + C(S32); + C(S64); + C(BITFIELD32); + default: + return "unknown"; + } +} + /* * The controller sends one nlmsg per family */ @@ -123,7 +149,8 @@ static int print_ctrl(struct rtnl_ctrl_data *ctrl, ghdr->cmd != CTRL_CMD_DELFAMILY && ghdr->cmd != CTRL_CMD_NEWFAMILY && ghdr->cmd != CTRL_CMD_NEWMCAST_GRP && - ghdr->cmd != CTRL_CMD_DELMCAST_GRP) { + ghdr->cmd != CTRL_CMD_DELMCAST_GRP && + ghdr->cmd != CTRL_CMD_GETPOLICY) { fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd); return 0; } @@ -136,7 +163,7 @@ static int print_ctrl(struct rtnl_ctrl_data *ctrl, } attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN); - parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len); + parse_rtattr_flags(tb, CTRL_ATTR_MAX, attrs, len, NLA_F_NESTED); if (tb[CTRL_ATTR_FAMILY_NAME]) { char *name = RTA_DATA(tb[CTRL_ATTR_FAMILY_NAME]); @@ -159,6 +186,52 @@ static int print_ctrl(struct rtnl_ctrl_data *ctrl, __u32 *ma = RTA_DATA(tb[CTRL_ATTR_MAXATTR]); fprintf(fp, " max attribs: %d ",*ma); } + if (tb[CTRL_ATTR_POLICY]) { + const struct rtattr *pos; + + rtattr_for_each_nested(pos, tb[CTRL_ATTR_POLICY]) { + const struct rtattr *attr; + + fprintf(fp, " policy[%u]:", pos->rta_type & ~NLA_F_NESTED); + + rtattr_for_each_nested(attr, pos) { + struct rtattr *tp[NL_POLICY_TYPE_ATTR_MAX + 1]; + + parse_rtattr_nested(tp, ARRAY_SIZE(tp) - 1, attr); + + if (tp[NL_POLICY_TYPE_ATTR_TYPE]) + fprintf(fp, "attr[%u]: type=%s", + attr->rta_type & ~NLA_F_NESTED, + get_nla_type_str(rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_TYPE]))); + + if (tp[NL_POLICY_TYPE_ATTR_POLICY_IDX]) + fprintf(fp, " policy:%u", + rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_POLICY_IDX])); + + if (tp[NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE]) + fprintf(fp, " maxattr:%u", + rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE])); + + if (tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_S] && tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_S]) + fprintf(fp, " range:[%lld,%lld]", + (signed long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_S]), + (signed long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_S])); + + if (tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_U] && tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_U]) + fprintf(fp, " range:[%llu,%llu]", + (unsigned long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_U]), + (unsigned long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_U])); + + if (tp[NL_POLICY_TYPE_ATTR_MIN_LENGTH]) + fprintf(fp, " min len:%u", + rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_MIN_LENGTH])); + + if (tp[NL_POLICY_TYPE_ATTR_MAX_LENGTH]) + fprintf(fp, " max len:%u", + rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_MAX_LENGTH])); + } + } + } /* end of family definitions .. */ fprintf(fp,"\n"); if (tb[CTRL_ATTR_OPS]) { @@ -235,7 +308,9 @@ static int ctrl_list(int cmd, int argc, char **argv) exit(1); } - if (cmd == CTRL_CMD_GETFAMILY) { + if (cmd == CTRL_CMD_GETFAMILY || cmd == CTRL_CMD_GETPOLICY) { + req.g.cmd = cmd; + if (argc != 2) { fprintf(stderr, "Wrong number of params\n"); return -1; @@ -260,7 +335,9 @@ static int ctrl_list(int cmd, int argc, char **argv) fprintf(stderr, "Wrong params\n"); goto ctrl_done; } + } + if (cmd == CTRL_CMD_GETFAMILY) { if (rtnl_talk(&rth, nlh, &answer) < 0) { fprintf(stderr, "Error talking to the kernel\n"); goto ctrl_done; @@ -273,7 +350,7 @@ static int ctrl_list(int cmd, int argc, char **argv) } - if (cmd == CTRL_CMD_UNSPEC) { + if (cmd == CTRL_CMD_UNSPEC || cmd == CTRL_CMD_GETPOLICY) { nlh->nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST; nlh->nlmsg_seq = rth.dump = ++rth.seq; @@ -324,6 +401,8 @@ static int parse_ctrl(struct genl_util *a, int argc, char **argv) matches(*argv, "show") == 0 || matches(*argv, "lst") == 0) return ctrl_list(CTRL_CMD_UNSPEC, argc-1, argv+1); + if (matches(*argv, "policy") == 0) + return ctrl_list(CTRL_CMD_GETPOLICY, argc-1, argv+1); if (matches(*argv, "help") == 0) return usage(); -- 2.26.2
