| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * f_cgroup.c Control Group Classifier |
| * |
| * Authors: Thomas Graf <tgraf@infradead.org> |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "utils.h" |
| #include "tc_util.h" |
| #include "m_ematch.h" |
| |
| static void explain(void) |
| { |
| fprintf(stderr, "Usage: ... cgroup [ match EMATCH_TREE ]\n"); |
| fprintf(stderr, " [ action ACTION_SPEC ]\n"); |
| } |
| |
| static int cgroup_parse_opt(struct filter_util *qu, char *handle, |
| int argc, char **argv, struct nlmsghdr *n) |
| { |
| struct tcmsg *t = NLMSG_DATA(n); |
| struct rtattr *tail; |
| long h = 0; |
| |
| if (handle) { |
| h = strtol(handle, NULL, 0); |
| if (h == LONG_MIN || h == LONG_MAX) { |
| fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n", |
| handle); |
| return -1; |
| } |
| } |
| |
| t->tcm_handle = h; |
| |
| tail = (struct rtattr *)(((void *)n)+NLMSG_ALIGN(n->nlmsg_len)); |
| addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0); |
| |
| while (argc > 0) { |
| if (matches(*argv, "match") == 0) { |
| NEXT_ARG(); |
| if (parse_ematch(&argc, &argv, TCA_CGROUP_EMATCHES, n)) { |
| fprintf(stderr, "Illegal \"ematch\"\n"); |
| return -1; |
| } |
| continue; |
| } else if (matches(*argv, "action") == 0) { |
| NEXT_ARG(); |
| if (parse_action(&argc, &argv, TCA_CGROUP_ACT, n)) { |
| fprintf(stderr, "Illegal \"action\"\n"); |
| return -1; |
| } |
| continue; |
| |
| } else if (matches(*argv, "police") == 0) { |
| NEXT_ARG(); |
| if (parse_police(&argc, &argv, TCA_CGROUP_POLICE, n)) { |
| fprintf(stderr, "Illegal \"police\"\n"); |
| return -1; |
| } |
| continue; |
| } else if (strcmp(*argv, "help") == 0) { |
| explain(); |
| return -1; |
| } else { |
| fprintf(stderr, "What is \"%s\"?\n", *argv); |
| explain(); |
| return -1; |
| } |
| } |
| |
| tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail; |
| return 0; |
| } |
| |
| static int cgroup_print_opt(struct filter_util *qu, FILE *f, |
| struct rtattr *opt, __u32 handle) |
| { |
| struct rtattr *tb[TCA_CGROUP_MAX+1]; |
| |
| if (opt == NULL) |
| return 0; |
| |
| parse_rtattr_nested(tb, TCA_CGROUP_MAX, opt); |
| |
| if (handle) |
| print_0xhex(PRINT_ANY, "handle", "handle %#llx ", handle); |
| |
| if (tb[TCA_CGROUP_EMATCHES]) |
| print_ematch(f, tb[TCA_CGROUP_EMATCHES]); |
| |
| if (tb[TCA_CGROUP_POLICE]) { |
| print_nl(); |
| tc_print_police(f, tb[TCA_CGROUP_POLICE]); |
| } |
| |
| if (tb[TCA_CGROUP_ACT]) |
| tc_print_action(f, tb[TCA_CGROUP_ACT], 0); |
| |
| return 0; |
| } |
| |
| struct filter_util cgroup_filter_util = { |
| .id = "cgroup", |
| .parse_fopt = cgroup_parse_opt, |
| .print_fopt = cgroup_print_opt, |
| }; |