On Wed, 2012-03-14 at 22:11 -0500, Will Drewry wrote: > Introduces a new BPF ancillary instruction that all LD calls will be > mapped through when skb_run_filter() is being used for seccomp BPF. The > rewriting will be done using a secondary chk_filter function that is run > after skb_chk_filter. > > The code change is guarded by CONFIG_SECCOMP_FILTER which is added, > along with the seccomp_bpf_load() function later in this series. > > This is based on http://lkml.org/lkml/2012/3/2/141 > > v15: include seccomp.h explicitly for when seccomp_bpf_load exists. > v14: First cut using a single additional instruction > ... v13: made bpf functions generic. > > Suggested-by: Indan Zupancic <indan@xxxxxx> > Signed-off-by: Will Drewry <wad@xxxxxxxxxxxx> > --- > include/linux/filter.h | 1 + > net/core/filter.c | 6 ++++++ > 2 files changed, 7 insertions(+), 0 deletions(-) > > diff --git a/include/linux/filter.h b/include/linux/filter.h > index 8eeb205..aaa2e80 100644 > --- a/include/linux/filter.h > +++ b/include/linux/filter.h > @@ -228,6 +228,7 @@ enum { > BPF_S_ANC_HATYPE, > BPF_S_ANC_RXHASH, > BPF_S_ANC_CPU, > + BPF_S_ANC_SECCOMP_LD_W, > }; > > #endif /* __KERNEL__ */ > diff --git a/net/core/filter.c b/net/core/filter.c > index 5dea452..d775edc 100644 > --- a/net/core/filter.c > +++ b/net/core/filter.c > @@ -39,6 +39,7 @@ > #include <linux/filter.h> > #include <linux/reciprocal_div.h> > #include <linux/ratelimit.h> > +#include <linux/seccomp.h> > > /* No hurry in this branch */ > static void *__load_pointer(const struct sk_buff *skb, int k, unsigned int size) > @@ -350,6 +351,11 @@ load_b: > A = 0; > continue; > } > +#ifdef CONFIG_SECCOMP_FILTER > + case BPF_S_ANC_SECCOMP_LD_W: > + A = seccomp_bpf_load(fentry->k); > + continue; > +#endif > default: > WARN_RATELIMIT(1, "Unknown code:%u jt:%u tf:%u k:%u\n", > fentry->code, fentry->jt, Acked-by: Eric Dumazet <eric.dumazet@xxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
